U.S. patent number 3,879,824 [Application Number 05/424,310] was granted by the patent office on 1975-04-29 for warp tying machine.
Invention is credited to Kazuo Mizuno.
United States Patent |
3,879,824 |
Mizuno |
April 29, 1975 |
Warp tying machine
Abstract
A warp tying machine comprises a machine body, old and new warp
yarn gripping means projecting from the body for gripping old and
new warp yarns in side by side positions, and lease rods positioned
below the yarn gripping means and projecting from the machine body
in the same direction for guiding the warp yarns in movement toward
the machine body. Yarn drawing means movable along the lease rods
are provided for drawing old and new warps along the lease rods
toward the machine body to stand-by positions. A yarn drawing hook
is mounted on the machine body and movable in a path of revolution
around the machine body, such path including the stand-by
positions. Yarn cutting means are provided on the body and include
means movable around the warp yarns when they are in the stand-by
positions for engaging the yarns and positive action cutting means
for cutting the engaged yarns. Yarn tying means are provided on the
body along the path of the yarn drawing hook for receiving the old
and new warp yarns which have been cut and for tying them together.
A yarn presence detecting means is provided for detecting the
presence of the yarns in the stand-by positions and for blocking
movement of the machine when a yarn is not detected in either
position.
Inventors: |
Mizuno; Kazuo (Hashima-gun,
Gifu Prefecture, JA) |
Family
ID: |
27185167 |
Appl.
No.: |
05/424,310 |
Filed: |
December 13, 1973 |
Foreign Application Priority Data
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Jan 24, 1973 [FR] |
|
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73.02375 |
Apr 3, 1973 [DT] |
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2316625 |
Jun 13, 1973 [IT] |
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25336/73 |
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Current U.S.
Class: |
28/186;
28/211 |
Current CPC
Class: |
D03J
1/16 (20130101) |
Current International
Class: |
D03J
1/00 (20060101); D03J 1/16 (20060101); D03j
001/18 () |
Field of
Search: |
;28/44,49 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rimrodt; Louis K.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
Claims
What is claimed is:
1. A warp tying machine comprising a machine body, old and new warp
yarn gripping means projecting from said body for gripping old and
new warp yarns in side by side positions, lease rod means
positioned below said yarn gripping means and projecting from the
machine body in the same direction for guiding the warp yarns in
movement toward said machine body, yarn drawing means movable along
said least rod means for drawing old and new warps along said lease
rod means toward said machine body to stand-by positions, a yarn
drawing hook mounted on said machine body and movable in a path of
revolution around said machine body, said path including said
stand-by positions, yarn cutting means on said body having means
movable around said warp yarns when they are in the stand-by
positions for engaging said yarns and positive action cutting means
for cutting the engaged yarns, yarn tying means on said body along
the path of said yarn drawing hook for receiving the old and new
warp yarns which have been cut and tying them together, a first
yarn detecting device having detecting elements projecting from
said machine body for detecting whether the advance of the machine
toward the old and new warp yarns has reached the positions of such
yarns and means coupled to said detecting elements for stopping
advance of said machine only when both an old and a new warp yarn
have been detected, and a second yarn detecting means having feeler
means projecting from said machine body for detecting the presence
of said yarns in said stand-by positions and having means actuated
by said feeler means for blocking movement of said machine when a
yarn is not detected in either position.
2. A warp tying machine as claimed in claim 1 further comprising
means for driving said machine along rails in a direction to engage
warp yarns, including ratchet and pawl means and said detecting
elements comprise detectors for engaging the old and new warp
yarns, and said means for stopping the advance of said machine
comprise lever means coupled with said detectors and engaging the
pawl means of said ratchet and pawl means for disengaging said
ratchet and pawl means when said detectors engage a yarn, whereby
said machine is advanced until both detectors have engaged yarns
and said detectors holding said yarns in said stand-by positions
when the advance of said machine is stopped.
3. A warp tying machine as claimed in claim 1 in which said feeler
means of said second yarn detecting means comprises a pair of
feelers projecting into the positions of the old and the new warp
yarns in the stand-by positions thereof, and said means actuated by
said feeler means comprises movable members and blocking means
engaged by said movable members unless said movable members have
been moved by the action of said feelers in engaging yarns.
4. A warp tying machine as claimed in claim 3 in which said means
actuated by said feelers comprises a freely slidable rod coupled
with each of said feelers, guide plates in which said slidable rods
are guided for sliding movement, rotatable cam and pawl means
coupled with the remainder of said machine and rotatable during the
operation of said machine, a blocking pawl lever for each slidable
rod and in the rest position of said machine engaged with said
rotatable cam and pawl means for blocking rotation thereof, and
pawl lever control plates on said slidable rods for engaging said
slidable rods on movement thereof and disengaging them from said
rotatable cam and pawl means when said feelers are engaged by warp
yarns in the stand-by positions thereof, whereby when said feelers
detect yarns, the slidable rods are moved to free said rotatable
cam and pawl means and the machine can continue its operation, and
when one or the other of said feelers fails to detect a yarn, the
slidable rod does not move and the blocking pawl lever is not
disengaged from said rotatable cam and pawl means, and the further
movement of said machine is blocked.
5. A warp tying machine as claimed in claim 1 in which said lease
rod means comprises a plurality of pairs of lease rods mounted one
above the other, each lease rod being mounted for rotation around
the longitudinal axis thereof back and forth through one-half
revolution and a push rod slidably mounted on each of said lease
rods for sliding movement therealong for pushing warp yarns passing
over the lease rods away from said machine body and leaving the
closest warp yarns free to be engaged by said yarn drawing
means.
6. A warp tying machine as claimed in claim 5 in which the push
rods on each pair of lease rods are on opposite sides of the lease
rods so that the push rods are opposed to each other in one
rotational position of the push rods and the push rods on the next
lower pair of push rods to a given pair of push rods are on the
opposite sides of the push rods from the push rods in said given
pair.
7. A warp tying machine as claimed in claim 1 in which said yarn
cutting means comprises a hook arm rotatably mounted on said
machine for rotation in a path which carries said hook arm around
the yarns in said stand-by positions, a fixed blade on said hook
arm, a movable blade pivotally mounted on said hook arm at a
position to cooperate with said fixed blade on said hook arm, and a
cam on said machine for engaging and pivoting said pivotally
mounted blade for pivoting for positively cutting said warp yarns
engaged by said hook arm during its rotation.
8. A warp tying machine as claimed in claim 1 in which said machine
has a disc rotatably mounted on the bottom of said machine body, an
arm on said disc extending upwardly along said body, said yarn
drawing hook being mounted on the end of said arm, said yarn hook
having yarn grooves thereon for engaging the old warp and the new
warp separately for drawing them to the yarn tying means.
9. A warp tying machine as claimed in claim 1 in which said yarn
tying means comprises a hook guide cylinder rotatably and slidably
mounted on said machine for sliding movement in the direction of
its length, means for rotating said cylinder and for moving it back
and forth in the direction of its length, a withdrawal hook member
within said cylinder and having a hook on the end thereof over
which said cylinder is movable, and a guide piece on the end of
said cylinder for engaging the warp yarns and wrapping them around
the guide cylinder and drawing them into the hook on the end of
said hook member during rotation of said cylinder.
10. A warp tying machine as claimed in claim 1 further comprising a
clipper on said body along the path of said yarn drawing hook just
past said yarn tying means, a yarn end receiving box on said body
along the path of said yarn drawing hook just past said clipper,
and yarn end disposal means on said box for positively gripping the
ends of the warp yarns being tied as they are cut by said clipper
and positively delivering them into the yarn end receiving box.
11. A warp tying machine as claimed in claim 10 in which said yarn
end disposal means comprises upper and lower grip pawls having
interfitting teeth thereon pivotally mounted above said box, means
for opening said grip pawls during advancement of the yarn by said
yarn drawing hook, and means for positively closing said grip pawls
during the action of said clipper while said yarn ends are clipped,
and means for opening said grip pawls and pivoting them downwardly
toward said box after said slipper has cut the yarns.
12. A warp tying machine as claimed in claim 1 in which said old
and new warp yarn gripping means each comprises a clip member and a
pressing plate having one end of the clip member pivoted thereto,
and fastening means on the other ends of said clip member and said
pressing plate and comprising a fastener member and a pair of
connecting rods pivoted thereto and having a space therebetween and
having the other ends thereof pivoted on said clip member, a clip
lever having one end pivotally mounted on said fastener member and
having a cam portion adjacent the pivoted end thereof, and a plate
spring on the other end of the pressing plate which fits between
said connecting rods and against which said cam portion bears when
said fastener member is engaged with the end of said pressing plate
and said clip lever is pivoted toward and against said plate
spring.
Description
BACKGROUND AND OBJECTS OF THE INVENTION
The present invention relates to a warp tying machine which
automatically ties a new warp to an old warp during a weaving
process so that a weaving operation can continue substantially
uninterrupted.
So far all the work for typing both a newly supplied yarn to be
tied to an old warp (hereinafter called the new warp) and the warp
already being used in the weaving process (hereinafter called the
old warp) has been manually performed. Therefore, it has been an
extremely inefficient method.
The first object of the present invention is to provide a warp
tying machine which automatically unites new and old warps.
The second object of the present invention is to provide a lease
rod to separate one by one the new and the old warps from rows of
the new and the old warps and also to provide a yarn picking brush
to draw out both warps to a stand-by position.
The third object of the present invention is to provide a mechanism
which detects whether the new and the old warps, respectively, have
been drawn into the standby position in the path of rotation of a
yarn drawing hook by means of a reliable feeler of a detecting
device.
The fourth object of the present invention is to provide a
mechanism which picks up the new and the old warps from the standby
position in the path of rotation of the yarn drawing hook and
delivers them to a tying device.
The fifth object of the present invention is to provide a yarn
cutting device which cuts off the said new and old warps on the
side of a slidable clip at the same time the yarn drawing hook
catches and holds the new and the old warps.
The sixth object of the present invention is to provide a tying
machine by which the new and the old warps drawn through the yarn
drawing hook are delivered to a guide piece and the said new and
old warps are united by the coordinating operation performed by the
guide piece, a withdrawal hook, and a hook guide cylinder
thereof.
The seventh object of the present invention is to provide a yarn
end disposal device with a yarn end receiving box so that,
simultaneously with the cutting of the yarn end drawn into the
guide piece of the tying machine by the yarn drawing hook, the yarn
end is neatly recovered by being pinched-off with upper and lower
grip pawls within the said box.
BRIEF DESCRIPTION OF THE INVENTION
In the present invention, in order to automatically tie an end of
new warp to an end of a warp being woven, a tying machine body is
slidably mounted on rails on a loom or a bench by means of a
control device and a slidable clip is provided for holding a row of
new and an old warps, respectively, in parallel. said clip projects
forwardly above and from the said machine body and lease rods and a
yarn picking brush of the said body so as to draw out the new and
the old warps one by one, respectively, from the end of the
respective yarn rows held in parallel by the said slidable clip to
a stand-by position in a path of rotation of a yarn drawing hook. A
feeler for detecting whether each of the new and the old warps has
reached the standby position and a detecting device for the yarn
linked with the said feeler are arranged in the front of and above
the direction of the advancement of the said body. In the interior
of the body is provided a yarn drawing hook mounted on a disc so as
to pick-off one by one the new and the old warps, respectively,
from the stand-by position in the path of rotation of the yarn
drawing hook. Simultaneously with the picking-off of the new and
the old warps by the said yarn drawing hook, a yarn cutting device
rotatably mounted in front of the slidable clip cuts off the excess
length of warp yarns. The new and the old warps are delivered to a
guide piece from the yarn drawing hook and to a tying device
provided on one side of the machine for tying these warps by a
withdrawal hook, a hook guide cylinder, and a guide piece.
Immediately thereafter, the yarn ends of the tied warps which are
delivered to the said tying device are cut by cutting blades, and
then, yarn ends which are cut-off in this way are neatly received
in a yarn end receiving box of a yarn end disposal device which is
provided on one side of the machine.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 are a side elevation view of one side and an enlarged
side elevation view of the opposite side, respectively, of the
device according to the invention;
FIG. 3 is an enlarged perspective side view of a transmission
mechanism which is slidably mounted on a rail;
FIG. 4 is a plan view on line A--A in FIG. 2 showing how to open
and close a pressing plate;
FIGS. 5 and 6 are enlarged perspective views showing a slidable
clip and how it is opened and closed;
FIG. 7 is an enlarged side view, partly cut away, of the tying
machine of FIGS. 1 and 2;
FIG. 8 is a schematic view showing the transmission mechanism for
the slidable clip of the machine as shown in FIGS. 1 and 7;
FIG. 9 is an elevation view on line B--B in FIG. 8;
FIG. 10 is a plan view on line C--C in FIG. 7 showing the
operations of a crank actuating rod and a brush;
FIG. 11 is a plan view on line D--D in FIG. 7 showing how the new
and the old warps are drawn out one by one from a row of yarns by a
yarn picking movement of the brush;
FIG. 12 is a plan view on line D'--D' in FIG. 7 showing operation
of a lease rod;
FIG. 13 is a front sectional view on line E--E in FIG. 7 showing
the operation of the lease rod and a condition in which the new and
the old warps hang crosswise;
FIG. 14 is a schematic view showing the operation of the lease rod
and a condition in which the new and the old warps hang;
FIG. 15 is a side elevation view showing a detecting device within
the tying machine;
FIGS. 16, 17, 18 and 19 are schematic perspective views of parts of
the detecting device of FIG. 15;
FIG. 20 is a schematic elevation view of part of the device of FIG.
15;
FIG. 21 is a view similar to FIG. 20 showing the parts in positions
when both the new and the old warps are simultaneously detected by
a feeler;
FIGS. 22 and 23 are schematic plan and elevation views,
respectively, showing the parts in positions when the machine stops
due to some malfunctioning either in the new warp or in the old
warp;
FIG. 24 is a schematic view showing how the yarn is drawn by the
lease rod and a yarn drawing hook;
FIG. 25 is an enlarged plan view of a yarn cutting device;
FIG. 26 is a schematic perspective view of a yarn tying device and
a transmission system therefor;
FIG. 27 is a schematic view of the withdrawal hook and hook guide
cylinder for tying yarns;
FIG. 28 is a front elevation view showing the interior of the tying
machine;
FIG. 29 is an enlarged sectional plan view taken on line X--X in
FIG. 7;
FIG. 30 is a partial plan view of part of the machine as shown in
FIG. 29 and showing the operation of the tying device;
FIG. 31 is a front view of a yarn end disposal device;
FIG. 32 is a side view partly broken away on line Y--Y in FIG. 31
and a schematic view of means for operating upper and lower pincher
plates;
FIG. 33 is a perspective schematic view of means for gripping yarn
ends;
FIG. 34 is an elevation view on line Z--Z in FIG. 32 and a
schematic view of means for operating a bell crank;
FIG. 35 is a schematic view showing the manner in which the tying
machine is employed when the said machine is installed on a power
loom or a work bench by means of a rail installation frame;
FIG. 36 is a schematic view showing the installing of the said
tying machine on a power loom by means on the rail installation
frame; and
FIG. 37 is a schematic view showing the installing of the said
tying machine on a work bench for tying warps.
DETAILED EXPLANATION OF THE INVENTION
As shown in FIGS. 1-3 of the drawings, the tying machine has a
frame 1 which pivotally supports spaced grip rods 3 and 4 on
opposite sides thereof on pivots 2 located at the tip end of frame
1, and on vertical extensions 3a and 4a thereof are mounted
detectors 7 and 8 with yarn detecting pieces 5 and 6 for yarns
formed thereon by bending the free ends under. A detecting device C
is constructed by connecting the ends of levers 9 and 10 with
supporting parts 3b and 4b of the foregoing grip rods 3 and 4, and
the other ends of the said levers 9 and 10 are passed through guide
grooves 12 and 13 of a guide rod 11 vertically mounted on the base
of the foregoing frame 1. A worm wheel 14 is so supported that it
rotates jointly with a guide roller 16 around a shaft 15 extending
laterally from the base of the frame 1 and a worm 17 is fitted on a
shaft 18 in engagement with the said worm wheel 14. On one end of
worm 17 is a ratchet gear 19 which rotates with the worm 17.
An actuating arm 20 approximately in the shape of a Z is provided
and shaft 18 is idly positioned in an elongated hole 21 in the
lower end of actuating arm 20 and an elongated hole 22 is provided
at the upper end 26 of arm 20. An eccentric shaft 24 on a hand
wheel 23 shown in FIG. 2 is connected to a shaft 25 and extends
through said elongated hole 22. The respective bases of pawls 27
and 28 are pivotally mounted on pins 29 at upper and lower points
of the center part of the foregoing actuating arm 20 and,
simultaneously with this, the pawl 27 and the pawl 28 are engaged
with the tip ends of the said lever 9 and lever 10, respectively.
Pawl ends 27a and 28a are normally supported so as to engage the
foregoing ratchet gear 19. A ratchet pawl 30 is attached to the end
of the foregoing frame 1 and is always engaged with the ratchet
gear 19 under the action of a spring 32. The said control device B
is mounted by screws 33 on one side of the tying machine as shown
in FIG. 2. Rolling on a lower rail 34 are a guide roller 16a
mounted on the tip end of frame 1 and a guide roller 16 mounted on
the rear end of the frame 1, and an arm 35 extends out of the side
of the tying machine and has roller 37 on the end thereof which
engages an upper rail 36, whereby the tying machine is mounted
slidably on the upper and lower rails 34 and 36 embracing the upper
rail by means of the guide roller 37.
As shown in FIGS. 4-6, a fastener 38 pivotally and rotatably
supports on pine 42 the ends of connecting rods 41 which are
disposed parallel with a ring 40 projecting from one end of a
receiving plate of a slidable clip 39. At the other ends of the
respective connecting rods 41 is rotatably connected by pins 43 a
clip lever 46 which is provided with a cam shaped end 44. A plate
spring 47 projects from one end of a pressing plate 49 which freely
opens and closes around a pivoted part 48 on the other end of the
foregoing slidable clip receiving plate 39. Spring 47 has a
pressure receiving part 51 which is bent moderately and corresponds
to the foregoing cam shaped end 44 and projects along a guide 50
which, when the fastener is closed, supports the said rods 41 in
parallel by extending into a space T formed between the foregoing
connecting rods 41. The plate spring 47 is fixed by screws 52 at
the one end of the foregoing pressing plate 49.
As shown in FIGS. 4 and 7-9, one of the foregoing slidable clips 39
is mounted on each of two rack bars 53 by setscrews 54 at the
respective ends thereof and the rack bars are driven by
intermediate gears 55 engaged with the respective rack bars 53 so
as to slide them, as shown in FIG. 1, in the opposite direction to
the direction of advance of the tying machine A. Thus the nearest
new and old warps S.sub.1 and K.sub.1 of the new and old warps S
and K, which are held in the foregoing respective slidable clips
39, touch one by one a feeler 56 described below. The intermediate
gears 55 engage with transmission gears 58 which are coaxial with
pawl gears 57 adjacent thereto, and each pawl gear 57 engages with
a respective pawl 60 pivoted on opposite sides of an advance
control plate 59. Each rack bar 53 thus moves in a longitudinal
direction in response to the upward movement of a rack bar 61, as
described hereinafter, which rotates the pawl gears 57 by the
advance pawls 60. Each of the new and the old warps S.sub.1 and
K.sub.1 is pressed against the said feeler 56, the inner end 64 of
which engages in an elongated hold 62 in the said advance control
plate 59. A support rod 69 for the feeler is displaced a little in
the same direction as the foregoing rack bar 61 against the force
of a spring 63. The inner end 64 of the feeler is inserted through
the advance control plate, as shown in FIG. 9, to support the
advance control plate 59 and a space is provided between the lower
end of the said plate 59 and the upper dead point of the rack bar
61 so that the said plate 59 is not actuated. The rack bar 61 can
be disengaged by moving guide wheels 65 in the axial direction and
rack bars 53 can be inclined upwardly around the foregoing
setscrews 54 to release engagement between the rack bars 53 and the
intermediate gears 55. In this condition, the rack bars 53 can be
returned to their original starting point for the operation by
pushing the rack bars 53 forward (to the left in FIG. 8).
As shown in FIGS. 7, 10 and 11, at the tip end of crank actuating
rods 67, the other ends of which are pivotally connected with crank
gears 66, opposed brush support metal fittings 68 are mounted
approximately in a straight direction and, at the tip of these
fittings 68, brushes 69 are disposed with the bristles projecting
toward each other. As each brush 69 rotates from the outside
inwardly half a revolution around support rods 70 as a center
during the rotation of the foregoing crank gears 66, the nearest
new and old warps S.sub.1 and K.sub.1 in the row of new and old
warps previously hung in shedding and bearing conditions along
lease rods 71, described hereinafter, are separated from the rest
of the warps and drawn one by one into the path of rotation of a
yarn drawing hook 72. The foregoing crank gears 66 are supported on
auxiliary shafts 73 and 74 and are driven by a transmission gear 77
on a main shaft 76 via a driven gear 75 on the said auxiliary shaft
74, and the main shaft 76 is driven by a pair of bevel gears 79 and
80, the gear 80 being on main shaft 76 and the gear 79 being on the
end of the shaft 78 for the hand wheel 23.
As shown in FIGS. 7 and 11-14, an upper pair and a lower pair of
the lease rods 71 and 71' are provided and are connected by a
connecting plate 83 and they are rotated around the axes of the
rods 71 and 71' by small gears 81 on the ends thereof, being guided
by the plate 83 which fits in circular grooves 82 in bosses 85 on
rods 71 and 71'. The small gears 81 are engaged with the foregoing
rack bar 61 and rotate back and forth through 180.degree.,
respectively, during the up and down movements of the said rack bar
61. Slidably positioned in bosses 85 are push rods 84, the ends of
which alternately push the row of new warps S and old warps K. An
actuating plate 87 has rollers 86 thereon and a horizontally
elongated hole 88 therein and approximately in the center thereof
through which the main shaft 76 extends. Plate 87 is joined with
the said connecting plate 83. A cam 89 on the main shaft 76 engages
the rollers 86 and, during the rotation of the said cam 89, the
actuating plate 87 reciprocates between the position indicated by
the solid line and the position shown by the chain line, and
thereby each push rod 84 moves freely back and forth in the
direction shown by the arrow P.sub.1 along the respective lease
rods 71 and 71' via the connecting plate 83. The push rods 84 slide
in grooves 90, which extend in the axial direction of the
respective lease rods 71 and 71'. Upper and lower rollers 91 are
mounted on the rack bar 61 and are engaged by cam 89' on the handle
shaft 78 during rotation of cam 89'. Handle shaft 78 passes through
an elongated hole 88' in the rack bar 61, as shown in FIG. 13.
During movement of the cam 89' through half a revolution, half a
revolution of 180.degree. is given to the respective lease rods 71
and 71' by the small gears 81 engaged with the said rack bar
61.
A detecting device D having casing 92 of almost U-shape is, as
shown in FIGS. 15-19, mounted within the upper part of the tying
machine and slidable rods 95 are freely slidable in a non-loaded
condition in guide grooves 94 in guide plates 93, provided at the
upper part of the said casing 92. The said rods 95 both have a
notch 96 in the lower edge thereof and end notches 97 at one end
thereof. Near said one end of these slidable rods 95 are retreat
control pins 98 and advance control pins 99 which project from the
rods so as to control the extent of the retreat and the advance
movements of the rods. Further, latch parts 111 are provided at the
other ends of the rods 95 to engage with the upper part of feelers
100, as described hereinafter. Control plates 112 project
horizontally and symmetrically toward each other from the
respective slidable rods 95 from points in the neighborhood of the
said notches 96. Actuating levers 113 for the slidable rods are
provided with curved edges 114 which contact a cam 123 of a
required curvature, as described hereinafter, and the lower end of
each lever 113 is fixed at the same angle on a shaft 115 provided
in the lower part of the machine casing 92.
On the respective upper free ends of these actuating levers 113 are
curved plates 116 having a moderate curvature and engagable with
the bottom edges of the slidable rods 95 for pushing the slidable
rods upwardly. At the ends of the curved plates are engaging pawls
117 bent almost at 90.degree. to the curved plates 116 for
withdrawing the slidable rods 95 by engaging the notches 96 at the
time of the actuation of the foregoing actuating levers 113. A cam
shaft 118 is supported in parallel with the shaft 115 and a driven
gear 120 is rotatably mounted on the middle of the said cam shaft
118. Gear 120 is engaged with a transmission gear 119 on main shaft
76. On both sides thereof, pawl cams 121 provided with pawls 121a
are idly rotatably mounted as shown in FIG. 18. Pawl cams 121 are
urged toward gear 120 in the axial direction of the cam shaft 118
by coil springs 122, and engage with latch pawl 126 on pawl levers
124 described below, so that an impact caused by the engagement of
the pawls 121a on pawl cams 121 with the pawl levers while the cam
shaft 118 is rotating is absorbed by the elasticity of coil springs
122. Cams 123 having cam profiles 123a are mounted on the same
shaft 118 and they rotate together with the cam shaft 118. Said
cams 123 strike the curved edges 114 of the slidable rod actuating
levers 113 on the shaft 115 during each revolution of the same cam
shaft 118, and this causes the slidable rods to move in the one
direction. Pawl levers 124 are mounted on a shaft 125 parallel with
the foregoing cam shaft 118 in the upper part of the machine casing
92 and have the latch pawls 126 at the lower ends thereof. If both
or either one of the new and the old warps S.sub.1 and K.sub.1 are
not detected by the foregoing feelers 100, the whole operation of
the foregoing tying machine A stops by means of the engagement of
the pawls 121a with the said latch pawls. Release pins 127 project
from the latch pawls 126 in the direction of the shaft 125. A
manual lever shaft 128 is positioned parallel to and under the
shaft 125 and pawl cams 129 are mounted thereon in line with
release pins 127. In operation, after excluding some malfunctioning
caused by a yarn of the new and the old warps, the release pins 127
are struck from the direction indicated by an arrow by means of the
respective pawl cams 129 by the operation of the handle 128 on the
foregoing manual lever shaft 128, whereby the engagement of the
latch pawls 126 on the pawl levers 124 with the respective pawls
121a of the pawl cams 121 is released.
In FIG. 15 the main shaft 76 on which the foregoing transmission
gear 119 is mounted, is perpendicularly arranged within the tying
machine A and the main shaft 76 is driven by the engagement of the
bevel gear 80 on the shaft 76 with a bevel gear 79 on the end of
the handle shaft 78. The upper ends of the feelers 100 are
connected with the latch parts 111 on the slidable rods 95 while
the middle of said feelers is pivotally supported on support rods
133 projecting from one side of the tying machine A.
Held between the slidable clips 39 and pressing plate 49 are about
the same number of respective ends of the groups of the new and the
old warps S and K, and the said new and old warps S and K are
passed over the respective lease rods 71 and 71' in the same manner
as in the shed of a loom. That is, every other yarn is passed on
one side of an upper lease rod and on the other side of a lower
lease rod, and the remaining yarns are passed on the other side of
the upper lease rod and the one side of the lower lease rod. With
this arrangement, only the nearest new and old warps S.sub.1 and
K.sub.1 on the side of the lease rods on which yarns are not
pressed by the push rods 84 will be free to be pulled one by one
from the warps to a stand by position 72a, as shown by a chain line
in FIG. 24 to be picked up by the yarn drawing hook 72 and moved to
position 72b. The yarn drawing hook 72 is constructed so that the
old warp K.sub.1 is picked up in yarn groove 141 and the new warp
S.sub.1 in yarn groove 142.
A yarn cutting device E is mounted on the device just above the
lease rods 71 and 71' and has a hook arm 144 with a yarn picking
hook 134 thereon, as shown in FIGS. 1 and 25, and is mounted on a
drive shaft 143 driven by the main shaft 76. A stationary blade 145
is mounted on the device and a movable blade 148 engaged with a
fixed cam 147 through a roller 146 is positioned to cooperate with
stationary blade 145 as it is moved during the rotation of the
cutting device by the fixed cam 147. The blades 145 and 148 cut the
new and the old warps S.sub.1 and K.sub.1 drawn in by the yarn
picking hook 134 during its rotation.
A tying device F is, as shown in FIGS. 1 and 26-30, mounted on the
sides of the apparatus and is provided with a hook guide cylinder
151 through which a withdrawal hook 150 with a hook 149 at the end
thereof moves back and forth. Said cylinder 151 engages, through a
guide piece actuating gear 152 on the circumference thereof, with a
spur gear 153 driven by the main shaft 76. A boss 154 on the said
cylinder 151 has a guide piece 155 projecting toward the end of
cylinder 151 which winds the new and the old warps S.sub.1 and
K.sub.1 around the said cylinder 151 after picking them from the
foregoing yarn drawing hook 72 and picks their ends onto the hook
149 projecting from the end of the said cylinder 151 as the boss
154 and guide plates rotates. At the same time, the new and the old
warps S.sub.1 and K.sub.1 are hooked by the hook 149, the said
cylinder 151 moves together with the boss 154 in the direction
shown by an arrow Q to move the cylinder 151 over the hook 149.
Then, in order to tie the two warps S.sub.1 and K.sub.1, in a
circular groove 156 at the end of the said guide piece actuating
gear 152 is connected a pin 160 on one end of a lever arm 159 on
which a roller 158 is securely mounted almost at the center thereof
and which has the other end pivoted on a supporting shaft 157. The
roller 158 is engaged in a cam groove 162 provided in a cam 161
mounted on the main shaft 76. The hook guide cylinder 151 and the
boss 154 are movable back and forth in the direction of the arrow Q
by the lever arm 159 and the pin 160 during the rotation of the cam
161. The shape of the cam groove 162 is such that the amount of the
advance and retreat movement of the withdrawal hook 150 with the
hook 149, the hook guide cylinder 151, the boss 154 with the
circular groove 156 and the spur gear 153 is properly controlled to
achieve tying of the warps S.sub.1 and K.sub.1, and then release
from hook 149.
As shown in FIG. 1, a disc 136 is provided which supports the yarn
drawing hook 72 on an arm 137. The disc 136 is mounted on the lower
end of the main shaft 76 driven by hand wheel 23 so that the said
hook 72 rotates on the disc 136 one revolution around the
circumference of the tying machine A for every revolution by the
hand wheel 23. Just past the tying device F in the direction of the
movement of the said hook 72 is a clipper 138 which cuts off
unnecessary yarn ends from the tied new and old warps S.sub.1 and
K.sub.1, and a yarn ends receiving box 139 into which the said yarn
ends are thrown as described hereinafter. The said box 139 and the
tying device F are, as shown in FIGS. 1 and 31-34, disposed side by
side on the one side of the foregoing tying machine A. A lever 166
having an angle shape contacts the circumference of a cam 165 on
the main shaft 76. In the interior of the said yarn ends receiving
box 139 is fixed a guide plate 168 in the shape of a sectional
angle with a longitudinal hole 167 thereon and on one part thereof
a part of a lever 171 of a lower pincher plate 170 is rotatably
pivoted on a pin 169. The said lever 171 has one end projecting
outside of the said yarn ends receiving box 139 through the
longitudinal hole 167. The lower pincher plate 170 is bent upwardly
at an adequate angle. Lower grip pawls 172 project at spaced
intervals T from the upper edge of plate 170. An upper pincher
plate 173 is fixed to the one end of a shaft 175 which is rotatably
supported in fittings 174 on the inner wall of the foregoing box
139. On one side of upper pincher plate 173 are upper grip pawls
176 which move back and forth in the respective spaces T between
the projections on the lower pincher plate 170. At the one end of
the shaft 175 is mounted a control lever 177 to control excessive
rotation of the upper pincher plate 173.
On the back side of the foregoing yarn ends receiving box 139, a
bell crank 178 is rotatably mounted on a shaft 179 and one end
thereof contacts the tip end of the lever 166 while the other end
thereof contacts a part of an actuating rod 181 through a
connecting rod 180. The said actuating rod 181 is rotatably
attached to connecting rod 18 by means of a pin 182 and the other
end of rod 181 contacts the one end of the lever 171. A tension
spring 183 is connected to the one end of the said lever 171 so
that the lower pincher plate 170 is pressed upwards around the pin
169.
As seen in FIGS. 1 and 35-37, a rail frame 184 is provided with
rail support arms 185 at the upper and the middle parts thereof
which support the upper and lower rails 36 and 34, and at the lower
part thereof is provided a hook arm 188 with hooks 187 supporting
yarn latch rods 140 for the new and the old warps S and K. Two or
three tying machines are detachably mounted by means of attaching
parts 191 and 192 as shown in FIG. 36 on a power loom 189 or a work
bench 190 for performing warp tying. New warps S are drawn from a
beam 193 and old warps K from a power loom 189 or the other beam on
a work bench 190, respectively, and approximately the same number
are held one by one, as shown in FIGS. 1 and 7, by the foregoing
slidable clips 39.
OPERATION
There will be described an example in which a tying machine A is
mounted on upper and lower rails 36 and 34 by rail support arms 185
on either a power loom 189 or a work bench 190, as shown in FIG. 36
or FIG. 37. Ends of the new warps S wound on the beam 193 are
automatically and successively tied with corresponding ends of the
old warps K being used in a weaving process. First of all, about
200 to 300 yarns from the old warp K being used in the weaving
process and about the same number of yarns from the new warps S
wound on the beam 193 in FIG. 36 are, as shown in FIGS. 4-6, placed
between the slidable clip 39 and the pressing plate 49. Said plate
49 is pressed against the interior surface of the clip 39 by
pivoting it around the pivot 48. Then, the fastener 38 pivoted on
the ring 40 of the said slidable clip 39 is rotated against the
pressing plate 49 as shown by an arrow P in FIG. 5 around the pin
42 and into the space T between the connecting rods 41 is fitted
the end of the plate spring 47 which is disposed parallel with the
guide 50 on the pressing plate 49. The clip lever 46 is then
rotated in the direction of arrow Q around the pin 43 and the pawl
latch 45 is pressed onto the surface of the plate spring 47. The
fastener is thus tightened to hold about the same number of new and
old warps in the clips 39.
The new and the old warps S and K hang, respectively, as shown in
FIG. 14 with alternate yarns on opposite sides of lease rods 71 and
71' in a shedding condition for tying as described above. When the
hand wheel 23 is rotated in the required direction, the bevel gear
79 at the interior end of the shaft 78 shown in FIG. 8 rotates and,
by the bevel gear 80 engaged therewith the main shaft 76 is
rotated. Cam 89' on shaft 78 also rotates and through rollers 91
reciprocates the rack bar 61 vertically to move the elements
engaged therewith respectively. The disc 136 at the lower end of
the main shaft 76 and the yarn drawing hook 72 on the arm 137 on
the said disc are moved in the required direction. At the same
time, by the rotation of the hand wheel 23 shown in FIGS. 2 and 3
in the direction of arrow P, the upper end 26 of the actuating arm
20 coupled therewith by shaft 25 also moves in the direction of
arrow P by the movement of the shaft 25 extending through the
elongated hole 22 to the actuating arm 20 in the direction of arrow
P.sub.2. Pawls 27 and 28 mounted on the said actuating arm 20 by
the pins 29 move in the direction of arrow P.sub.2 to engage the
pawl part 27a and 28a with the ratchet gear 19. Rotation of hand
wheel 23 through 180.degree. advances the ratchet gear 19 and the
worm 17 on the shaft 18 to drive the worm wheel 14 engaged with the
said worm 17. This rotates the guide roller 16 on the shaft with
the said worm wheel 14 so that the tying machine A moves, as shown
in FIG. 1, slightly in the direction of arrow P.sub.1 while being
guided by the guide roller 37 which embraces the upper rail 36.
Further, upon rotation of the said hand wheel 23 through another
180.degree., the actuating arm 20 moves in the reverse direction to
the foregoing direction around the shaft 25 as the center.
Consequently, the pawl parts 27a and 28a of the pawls 27 and 28
disengage from the ratchet gear 19 and return to their original
position. By successively rotating the hand wheel 23, the tying
machine A is moved continually at regular intervals along rails 34
and 36.
By the vertical reciprocating motion of the said rack bar 61, which
is synchronized with the movement of the said tying machine A in
the direction of arrow P.sub.1, the respective small gears 81
engaged with the said bar 61 are, as shown in FIGS. 7 and 12-14,
rotated back and forth through 180.degree..
The same reciprocating rotational motion is given to the respective
lease rods 71 and 71' on which these small gears 81 are provided.
In order to alternately push back each row of the new and the old
warps S and K hung as shown in FIG. 11 on opposite sides of the
respective lease rods 71 and 71' by the push rods 84 in the grooves
90, a reciprocating motion in the axial direction of the respective
lease rods 71 and 71' is given to the push rods 84 by the actuating
plate 87 driven by rotation of the cam 89 on the main shaft 76
which alternately engages the rollers 86 on the plate 87 on
opposite sides of the said plate 87, as shown in FIG. 12. With the
actuating of the plate 87, the push rods 84, which are engaged in
the grooves 82 on opposite sides of the connecting plates 83 on the
one end of the said plate 87, the said push rods are moved parallel
with the respective lease rods 71 and 71' in the direction of the
advancing movement of the tying machine A, as shown in FIGS. 10 and
12. Further, the end of each of the crank actuating rods 67 with
the brushes 69 at the tip ends thereof is driven by the crank gears
66 from the driven gear 75 on the auxiliary shaft 74, which in turn
is engaged with the transmission gear 77 on the said main shaft 76,
so that each crank actuating rod 67 makes the respective brush 69
thereon perform a circular motion inwardly around the supporting
rod 70 as a center. Simultaneously, the tip end of each brush 69
engages, as shown by the solid lines in FIG. 11, the yarn row on
the side of the lease rod which is not pressed by the push rods 84
and draws back toward the device the yarn S.sub.1 and K.sub.1 of
the warps S and K, which is at the nearest end of each yarn row.
Thus, the nearest yarns are separated one by one from the other
yarns and, at the same time, by the restoring force due to the
elasticity of yarns themselves, they assume a perpendicular
position in the path of rotation of the yarn drawing hook 72, as
shown in FIG. 1. Simultaneously with this, a part of the respective
new and old warps S.sub.1 and K.sub.1 touch the feeler 56 and the
feelers 100 of the detecting device D.
Grip rods 3 and 4 of the detecting device D advance together.
Therefore, when the new warp S.sub.1 and the old warp K.sub.1, hung
between the yarn latch rods 140 and 140' at the bottom of the
machine and the slidable clip 39 at the top of the tying machine A,
touch the detecting pieces 5 and 6 at the same time, or one of them
touches first, the force with which they press on the pieces 5 and
6 causes the grip rod 3 or 4 to pivot around the shaft 2 in the
direction as shown by the arrows. Consequently, the levers 9 and 10
connected to said grip rods 3 and 4 are moved upwards and the pawls
27 and 28 engaged by said levers 9 and 10 are pivoted upwardly
around the pins 29. The ratchet gear 19 is not rotated, and
therefore the tying machine A does not advance, even if the hand
wheel 23 is rotated further.
In this case, if the group of warps S (FIGS. 1 and 7) in front of
the detecting piece 5 are very close together, and the group of
warps K in front of the detecting piece 6 are spaced apart, the
detecting pieces 5, while advancing, will touch the warp S.sub.1
first before the detecting piece 6 touches the warp K.sub.1. The
grip rod 3 for the piece 5 which was touched first nevertheless is
actuated to disengage the pawl 27 by means of the lever 9. However,
the pawl 28 connected with the detecting piece 6 which has not yet
contacted the warp K is still in a position in which it is possible
to engage the ratchet gear 19, and therefore the tying machine A
continues to advance. Consequently, the movement thereof continues
until one yarn in the group of warps K is touched by the detecting
piece 6. By this means, the new and the old warps S.sub.1 and
K.sub.1 are always positioned on particular lines by detecting
pieces 5 and 6, and when in these lines they touch the feelers 56
and 100. Simultaneously with the foregoing operation, the
respective new and old warps S.sub.1 and K.sub.1 press on the
feeler 56, whereby the feeler support rod 64, which supports the
said feeler 56, is displaced to some extent in the opposite
direction to the arrow P.sub.1 against the force of the spring 63.
The interior end of the feeler support rod 64 is, as shown in FIGS.
8 and 9, extended through the elongated hole 62 in the advance
control plate 59, which moves up and down, and thereby the said
control plate 59 is stopped in the raised position and transmission
from the rack bar 61 is stopped at the upper dead point of the rack
bar 61, so that the bar 61 runs idly with respect to control plate
59. At the same time as this operation, a part of the new and the
old warps S.sub.1 and K.sub.1 touches the feelers 100 supported by
the latch parts 111 on the slidable rods 95 and by the supporting
rods 133. Then the new and the old warps S.sub.1 and K.sub.1 in the
path of rotation of the yarn drawing hook 72 in the stand-by
position are drawn by means of the yarn picking hook 134 shown in
FIGS. 1 and 15 towards the side of the tying machine A. Therefore,
the feelers 100 move, as shown in FIG. 15, the slidable rods 95 to
which the feelers are connected through the latch parts 111 in the
foreward direction, and the respective end notched parts 97 in the
lower part of the rear ends of the respective rods are pulled
through the guide grooves 94 in the guide plate 93. The movement is
stopped by the abutment of the respective advance control pins 99
with the guide plate 93.
Simultaneously with the foregoing, the control plates 112 provided
opposite each other on the inside of the slidable rods 95 engage
the pawl levers 124 and move the respective hook pawls 126 on the
respective pawl levers out of engagement with the pawls 121a on the
pawl cams 121 on the cam shaft 118. This condition is maintained
for a short time while the new and the old warps S.sub.1 and
K.sub.1 are picked up by the yarn drawing hook 72, as shown in FIG.
24, during the movement of the said yarn drawing hook and moved to
positions shown by 72a and 72b. Simultaneously, the new and the old
warps S.sub.1 and K.sub.1 are drawn by the yarn picking hook 134
shown in FIG. 25 successively into the space between the stationary
blade 145 and the movable blade 148. The warps are cut by the
blades when the movable blade is actuated as it moves past the
protrusions on the cam 147.
Simultaneously with the said cutting, the cams 123 on the cam shaft
118 rotate in the direction of the arrow in FIG. 20 and the cam
profiles 123a contact the respective curved contact surfaces 114 so
that the respective slidable rod actuating levers 113 are moved in
the rearward direction around the shaft 115 and push the lower
surface of the slidable rods 95 contacted thereby upwards by means
of the curved plates 116 provided at the tops of the respective
levers. The engaging pawls 117 thereof are then hooked into one end
of the notches 96 in the slidable rods 95 and the respective end
notched parts 97 are raised upwardly in the guide grooves 94 so
that they do not engage plate 93. The retreat control pins 98 on
the slidable rods 95 then engage the interior side of the guide
plate 93 and the movement of rods 95 is stopped and the machine is
restored to its starting condition for the next operation. The
foregoing operation is repeated under normal conditions each time
the new and the old warps S.sub.1 and K.sub.1 are successively
drawn to the standby positions.
However, if either of the new or the old warps S.sub.1 or K.sub.1
does not contact one of the feelers because they are widely spaced
or warps are twisted due to an extremely crowded arrangement or
only one yarn contacts with a feeler and the other yarn is broken,
and so forth, the feeler 100 on the side where a yarn is detected
and the slidable rod 95 corresponding thereto is actuated as
outlined above, while the other slidable rod does not move.
Therefore, the relative positions of the slidable rods 95 become
different, as shown in FIGS. 22 and 23. The pawl lever 124
corresponding to the unmoved slidable rod 95b is not subjected to
the action of the plate 112 for said rod 95b. This causes the
actuation of the detecting device D for stopping the apparatus by
the hook pawn 126 of the pawl lever 124 engaging with the pawl 121a
of the pawl cam 121 on the cam shaft 118. This blocks rotation of
gear 120, gear 119 and main shaft 76, and the operation by the
wheel 23 is thus stopped.
When the improper yarn condition is corrected, the manual lever
shaft 128 shown in FIGS. 1 and 16 is operated by the handle 128a in
the direction of the arrow, the pawl cams 129 on said shaft 128
rotate in the same direction as said lever shaft so that the pawl
lever 120 in the path of rotation thereof is moved in the same
direction. By the displacement of the said pawl lever 124, the hook
pawl 126 thereon is released from its engagement with the pawl 121a
of the pawl cam 121 on the cam shaft 118 to allow the main shaft to
rotate again. Thus, if either of the new or the old warps S.sub.1
or K.sub.1 is not properly positioned, the whole operation of the
tying machine A is immediately stopped on the spot. By correcting
the condition of the yarn to the normal condition of the new and
the old warps S.sub.1 and K.sub.1 with both warps side by side in
correct positions and touching the feelers 100, the operation is
resumed.
The new and the old warps S.sub.1 and K.sub.1 which are cut by the
said yarn cutting device E are picked up by the yarn drawing hook
72 during its movement and carried to the tying device F along the
path of rotation of the said hook, the hook passing the said yarn
tying device F and reaching the neighborhood of the position 72a
shown by a chain line in FIG. 1. A part of the respective new and
old warps S.sub.1 and K.sub.1 are engaged over the boss 154 in
FIGS. 26 and 27 and picked by the guide piece 155 during its
rotation. At the same time, the yarn ends of the new and the old
warps S.sub.1 and K.sub.1 extending between boss 154 and the hook
at position 72a are cut off by the clipper 138. Simultaneously with
this cutting, when the new and the old warps S.sub.1 and K.sub.1
picked by the guide piece 155 are guided by the said guide piece
155, they rotate, as shown in FIG. 26, through one revolution while
being wound around the circumference of the hook guide cylinder
151. The hook guide cylinder 151 starts to slide together with the
boss 154 in the opposite direction to the arrow Q by the rotation
of the cam 161 as described and shown in FIG. 30 previously, on the
main shaft 76 as the roller 158 on the lever arm 159 is guided
within the cam groove 162 of the said cam. The hook 149 at the tip
end of the withdrawal hook 150 which projects out of the interior
of the said hook guide cylinder 151 hooks the ends of the new and
the old warps S.sub.1 and K.sub.1 which are drawn into the said
hook 149 as shown in FIG. 26.
Simultaneously with the said drawing-in operation, the position of
the roller in said cam groove 162 is changed to cause a reverse or
outward movement of the boss 154 and the hook guide cylinder 151 in
the direction of the arrow Q shown in FIGS. 26 and 30 over the hook
150 to pass the loop of the warps over the ends thereof, thus tying
warps S.sub.1 K.sub.1 together. The position of roller 158 in the
cam groove 162 is successively changed, whereby the united warps
are pushed off the hook guide cylinder 151 and drop downwardly in a
good order over the yarn latch rod 140' as shown at Z in FIG.
1.
Immediately before the yarn ends F.sub.1 of the warps S.sub.1 and
K.sub.1 which are cut off by the clipper 138 are about to be cut
off, they are gripped between the upper and the lower grip pawls
176 and 172 on the yarn end receiving box 139 as shown in FIGS. 1
and 31-34. Simultaneously with the separation of the respective
yarn ends from the yarn drawing hook 72 by the further movement of
said hook 72 along its circular path, the yarn ends are cut off by
the clipper 138 shown in FIG. 1.
At the same time as the foregoing operation, the cam 165 on the
main shaft 76 shown in FIGS. 1 and 32 makes one revolution and the
profile thereof engages the lever 166, which in turn engages one
end of the bell crank 178. The bell crank 178 is pivoted around the
shaft 179 to position 178a, shown by chain lines in FIG. 34, and
the actuating rod 181 linked with the end of the said bell crank by
the connecting rod 180 is pivoted around the shaft 182 to the
position shown by the chain lines 181a. The free end of the lever
171 on the lower pincher plate 170 is pivoted upwards around the
pin 169 and the said lower plate 170 is displaced in the direction
of the curved arrow P in FIGS. 32 and 33 to the position shown by
the chain line 170a. At the same time, the upper pincher plate 173
which rests on the lower pincher plate 170 due to its own weight is
inclined downwardly as shown by chain lines 173a and the control
lever 177 of the shaft 175 thereof engages with part of the plate
164 shown in FIGS. 21 and 32, which acts as a stop.
In the foregoing case, the respective yarn ends F.sub.1 are pinched
underneath the respective lower grip pawls 172 of the lower pincher
plate 170, as shown in FIG. 33, and, therefore, by inclining the
lower pincher plate 170, the yarn ends are, while being pinched in
the horizontal direction, pushed down from the upper surface of the
respective upper grip pawls 176 into the yarn ends receiving box
139. Simultaneously with the separation of the yarn ends F.sub.1
from the respective upper grip pawls 176, the relationship between
the cam 165 and the lever 166 is restored to the original
relationship, as shown in FIG. 33 and, also, the bell crank 178 and
the actuating rod 181 are restored to their original positions and,
at the same time, the lower pincher plate 170 is restored to the
original position by the force of the tension spring 183 connected
to the end of the lever 171. The upper pincher plate 173 is pushed
upwards for the next operation.
The tying machine A continually performs the tying of the new and
the old warps by repeating the described operation.
EFFECTIVENESS OF THE INVENTION
The tying machine of the present invention automatically carries
out the tying of a new warp to an old warp in a weaving apparatus.
Therefore, it differs from the conventional type weaving machine
wherein extremely laborious work is performed manually for tying
the new warps to the old warps one by one. In many cases, some
pairs of warps will not be tied in the hand tying due to
insufficient twisting and tying of the new and the old warps.
Moreover, the efficiency of the overall weaving operation is
greatly reduced because the weaving machine is idle for many hours.
The efficiency of weaving can be greatly increased by the
employment of the present tying apparatus by which the tying of
warps can be performed in a short time.
In the present invention, the detecting device C is provided so
that movement of the tying machine A stops only when the new and
the old warps S.sub.1 and K.sub.1 are detected as being on the same
and proper line during the advancement of the said detecting pieces
5 and 6. In case either one of the new warps or the old warps S or
K are crowded and the other is widely spaced, the detecting piece
which touches the warp at the front crowded warps actuates the
detector and disengages one of the pawls 27 or 28 and the ratchet
19, but the other pawn coupled with the detecting piece not in
contact with a yarn remains in engagement with the ratchet 19 and
causes the tying machine A to continue to move until the detecting
pieces 5 and 6 engage both the new and the old warps S.sub.1 and
K.sub.1 such that they are in the proper line. Consequently, even
if the warps are crowded or widely spaced, the tying machine can be
easily guided so as to bring the new and the old warps S.sub.1 and
K.sub.1 smoothly into the path of rotation of the yarn drawing hook
72.
Also, in the present invention, by the provision of the fastener 38
and the plate spring 47 in the clips 39 and plate 49, the new and
the old warps S.sub.1 and K.sub.1 are held tightly between the clip
39 and the pressing plate 49. Therefore, even if tension is exerted
on the warps by the lease rods, the clip 39 and the pressing plate
49 continue to hold the warps. Since fastener 38 is a flip-flap
type fastener, it cannot be easily opened, even if it is acted on
by a yarn which might get caught on the pawl latch 45 or by
vibration or the like to which it is subject.
Further, in the present invention, where the yarns are difficult to
separate from each other due to nap or the like, the brushes 69 are
mounted so that their angles with respect to the row of yarns can
be adjusted freely so that the yarns can be easily and smoothly
separated from each other.
In this invention, the pairs of upper and the lower lease rods 71
and 71' with the push rods 84 thereon rotate back and forth through
about half a revolution of 180.degree.. By alternately pressing
back the rows of the respective new and old warps S and K, the
nearest yarns in the respective rows are left free and are
positively drawn one by one to the stand-by position in the path of
rotation of the yarn drawing hook 72 by the yarn picking brushes
69.
Further, in the present invention, the feelers 100 extending ahead
of the tying machine A reliably detect whether the new and the old
warps S.sub.1 and K.sub.1 are properly positioned in the path of
rotation of the yarn drawing hook 72 and when one or the other of
the said warps is not properly positioned, the operation of the
tying machine A is stopped at once so that the condition can be
corrected. Thus, the tying is correctly accomplished.
Moreover, the apparatus of the present invention is so designed
that the new and the old warps S.sub.1 and K.sub.1 which are
positioned in the path of rotation of the yarn drawing hook 72 in
the stand-by position are separately picked up in the yarn grooves
141 and 142 of the yarn drawing hook 72 and, regardless of the size
of yarns, the yarns are positively delivered to the tying device
F.
Further, in the apparatus of the present invention, those parts of
the new and old warps S.sub.1 and K.sub.1 which are picked up by
the yarn drawing hook 72 from the stand-by position are also hooked
by the yarn picking hook 134 and by means of the yarn cutting
device E, the part of the new and the old warps S.sub.1 and K.sub.1
between the yarn drawing hook 72 and the slidable clip 39 is
positively cut by the stationary blade 145 and the movable blade
148. This differs from the prior art method wherein cutting is
achieved by pressing yarns against a stationary blade after tying.
The prior art process is easily upset by mistiming of the cutting
caused by stretching of elastic yarn. In the present invention, the
tying process can be smoothly and reliably performed due to the
positive cutting of the new and the old warps S.sub.1 and
K.sub.1.
The apparatus of the present invention is so designed that the
withdrawal hook 150 having the hook 149 thereon is slidable within
the hook guide cylinder 151 and the ends of both warps S.sub.1 and
K.sub.1 are hooked in the hook 149 after they are wrapped around
hook guide cylinder 151 by the guide piece 155. The warps S.sub.1
and K.sub.1 are tied by subsequent movement of the said hook guide
cylinder 151 over hook 150.
Finally, the apparatus of the present invention is so designed that
the yarn ends F.sub.1 of the new and the old warps S.sub.1 and
K.sub.1 which are drawn to the tying device F by the yarn drawing
hook 72 are cut off after they are pinched between the respective
upper and lower grip pawls 172 and 176 of the upper and the lower
pincher plates 173 and 170. Therefore, no matter whether a yarn is
shrinkable or weak, it will be neatly received in the yarn ends
receiving box 139 and, moreover, the yarn ends F.sub.1 are received
side by side in good order without being scattered around.
* * * * *