U.S. patent number 3,892,064 [Application Number 05/469,886] was granted by the patent office on 1975-07-01 for device for compensating changes in roving winding tension in spinning machine.
This patent grant is currently assigned to Kabushiki Kaisha Toyoda Jidoshokki Seisakusho. Invention is credited to Eijiro Araki, Mitsuo Mori, Toshio Morishita.
United States Patent |
3,892,064 |
Araki , et al. |
July 1, 1975 |
Device for compensating changes in roving winding tension in
spinning machine
Abstract
In a flyer frame, winding of rovings is performed by utilizing
the difference in rotation rate between a flyer and a bobbin.
Therefore, it is necessary to reduce the rotation rate differences
with increase of the bobbin diameter. The bobbin is driven through
one of a pair of cone drums around which a belt is stretched, and
the rotation rate of the bobbin can be adjusted by changing the
belt position along the length of the cone. A device for
compensating changes in roving winding tension comprises a link
mechanism having at least two elements and disposed to connect a
belt shift for moving a belt with a moving member capable of
intermittent movement at a constant pitch. The link mechanism is
moved by the moving member along a fixed guide member having a cam
surface while part thereof is engaging the cam surface of the fixed
guide member. By the cooperative action of the cam surface and link
mechanism, the constant-pitch intermittent movement of the moving
member is converted to a desired movement of the belt, thus
compensating the changes of the roving tension.
Inventors: |
Araki; Eijiro (Toyoake,
JA), Mori; Mitsuo (Toyota, JA), Morishita;
Toshio (Kariya, JA) |
Assignee: |
Kabushiki Kaisha Toyoda Jidoshokki
Seisakusho (Kariya, JA)
|
Family
ID: |
13098620 |
Appl.
No.: |
05/469,886 |
Filed: |
May 14, 1974 |
Foreign Application Priority Data
|
|
|
|
|
May 25, 1973 [JA] |
|
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48-58933 |
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Current U.S.
Class: |
57/96 |
Current CPC
Class: |
D01H
1/26 (20130101) |
Current International
Class: |
D01H
1/26 (20060101); D01H 1/00 (20060101); D01h
001/26 (); D01h 001/36 () |
Field of
Search: |
;57/92,93,96,98,99,102
;242/26.1,26.2,26.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Petrakes; John
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
Claims
1. A device for compensating changes in roving winding tension in a
spinning machine, comprising a pair of cone drums mounted for
rotation in said spinning machine, a belt-like member stretched
around said cone drums to transmit rotation of one of said cone
drums to the other, a belt shifter associated with said belt-like
member to move said belt-like member along the length of said cone
drums, a moving member capable of movement to energize said belt
shifter, a link mechanism including at least two link elements
pivotably connected together, said belt shifter being connected
through said link elements with said moving member, and guide means
having a cam surface at a position apart by a predetermined
distance from the movement locus of said link mechanism, a part of
said link mechanism being engaged with the cam surface of said
guide means so that the movement of said moving member is
transferred to said belt shifter while being subject to the
influence of said cam surface.
2. The device as set forth in claim 1, wherein said guide means is
composed of a flexible material.
3. The device as set forth in claim 2, wherein said guide means is
suspended and supported by adjustable means and the cam surface of
said guide means is adapted to spinning conditions of a roving to
be wound by adjustment of said adjustable means.
4. The device as set forth in claim 3, wherein said adjustable
means are bolts.
5. The device as set forth in claim 2, wherein said part of said
link mechanism to be engaged with the cam surface is composed of a
roller connected at a connection of said link elements.
6. The device as set forth in claim 5, wherein said two link
elements are biased toward each other by a resilient member to
ensure the engagement of said roller with the cam surface.
7. The device as set forth in claim 1, wherein said guide means is
composed of a link mechanism including a plurality of members, and
every two adjacent members are pivotably connected to each other,
and individual members are supported so that their positions are
changed with respect to said link mechanism connecting said belt
shifter with said moving member.
Description
BACKGROUND OF THE INVENTION
This invention relates to a bobbin driving device for a flyer frame
in which winding of rovings is performed by utilizing the
difference in rotation rate between a flyer and a bobbin. More
particularly, the invention relates to a device for compensating
changes in roving winding tension in the bobbin driving device of
the type described, which can change the rotation rate of the
bobbin so as to compensate the changes in tension on the rovings
being wound.
In a flyer frame, winding of rovings is generally performed by
utilizing the difference in rotation rate between a flyer and a
bobbin, and it is necessary to reduce this difference of the
rotation rate with increase of the bobbin diameter. For this
purpose, a pair of cone drums are generally employed and they are
so disposed that the rotation rate of the bobbin is changed
appropriately. More specifically, since the roving winding tension
is generally fixed under certain conditions, the cone drums having
a certain diameter-length curve, which enables maintenance of this
winding tension, are employed. However, the rovings to be treated
in one flyer frame are not always under the same conditions, but in
general, various rovings different in winding conditions have to be
treated. In case the cone drums designed to take up rovings of
certain conditions are used for winding rovings of different
conditions, the rotation rate of the bobbin is not reduced in
harmony with increase of the bobbin diameter, resulting in
perpetual change of the tension on the roving being wound, and
therefore, bad influences are given to the wound roving.
In order to eliminate such bad influences due to the tension change
occurred where rovings of different conditions are wound, it has
heretofore been proposed to exchange cone drums or to change the
feed pitch of a belt stretched around paired cone drums. In the
case of the former, cone drums should always be exchanged because
conditions of rovings to be treated are not identical, and in fact,
it is not possible according to this method to attain optimum
compensation of the tension change. In the case of the latter,
since the constant feed pitch is maintained throughout the
operation of winding a roving of certain conditions, the collective
change of tension throughout the winding operation can be
compensated to some extent but if tension changes exceeding the
allowable range are temporarily brought about during the winding
operation, it is quite impossible to compensate such individual
tension changes. As means for overcoming this defect, there has
been proposed a device in which the variable pitch feeding of a
belt is effected by utilizing a cam mechanism or the like. In this
case, changes of the tension owing to the difference of conditions
among rovings can be compensated relatively effectively, but this
conventional device has a complicated structure including two long
racks and a differential gear mechanism and further, this device
has such a mechanical defect that the belt hung on cone drums has
to be shifted in the twisted or unnatural state. Thus, no practical
device capable of complete compensation of the tension has been
developed as yet.
It is therefore a primary object of this invention to provide a
device for compensation of changes in roving winding tension, which
in spite of a very simple structure can overcome the foregoing
defects involved in conventional devices and which can wind rovings
constantly under a uniform tension without necessary of exchanging
cone drums regardless of variations of roving winding
conditions.
SUMMARY OF THE INVENTION
In a flyer frame, winding of rovings is generally performed by
utilizing the difference in rotation rate between a flyer and a
bobbin. Accordingly, it is necessary to reduce this difference of
the rotation rate with increase of the bobbin diameter. The bobbin
is driven through one of a pair of cone drums around which a belt
is disposed and the rotation rate of the bobbin is changed by
changing the belt position.
The device of this invention for compensating changes in roving
winding tension for use with a spinning machine comprises a link
mechanism having at least two elements and disposed to connect a
belt shift for moving a belt with a moving member capable of
intermittent movement at a constant pitch. The link mechanism is
moved by the moving member along a fixed guide member having a cam
surface while part thereof is engaging the cam surface of said
fixed guide member. By the cooperative action of the cam surface
and link mechanism, the constant pitch intermittent movement of the
moving member causes a desired movement of the belt. The foregoing
primary object of the invention can be attained by the above
arrangement.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects and advantages of this invention will
become more apparent from reading the following detailed
description in conjunction with the accompanying drawing, in which
corresponding reference characters indicate corresponding portions
throughout the drawing, and in which:
FIG. 1 is a perspective view showing a bobbin driving system of a
spinning machine provided with the device of this invention for
compensating changes in roving winding tension;
FIG. 2 is a view showing the front of the bobbin driving system of
FIG. 1 in roving winding operation; and
FIG. 3 is a perspective view showing the main parts of another
embodiment of the device of this invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Referring now more particularly to FIG. 1 of the drawing, a device
constructed in accordance with the principles of this invention is
illustrated therein. The device is in the state that the winding of
a roving has been completed. A belt 3 is stretched around a driving
cone drum 1 and a driven cone drum 2 and its position on the drums
1 and 2 is held by an upper frame 4 and a lower frame 5. A member 6
for connecting both the frames 4 and 5 is connected to one end of a
belt shifter 7. As in the known devices, the belt 3 is allowed to
slide on the cone drums 1 and 2 by movement of the belt shifter 7
so that the rotation rate of a bobbin (not shown) connected with
the cone drum 2 is gradually reduced. The other end of the belt
shifter 7 is connected to one element of a link mechanism, which
comprises two link elements 8 and 9, in a manner allowing the
element 8 to turn. A roller 18 is supported for rotation on a pin
17, which serves to pivotably connect one element with the other.
The link element 9 is turnably connected to a moving member or a
rack 10. As in the known devices, this rack 10 is engaged with a
pinion 13 mounted on a rotary shaft 12, the pinion 13 being rotated
in a known manner by lowering of a weight 11. Intermittent movement
of the pinion 13 is provided by an arrangement comprising ratchets
16, and ratchet wheel 15 connected with the shaft 12 through a
train of relatively small gears 14. Therefore, the rack 10 is
intermittently moved toward the left, as shown by an arrow in FIG.
2, by intermittent movement of the pinion 13.
An L-shaped plate 19 is fixed to the machine frame substantially
above the rack 10, and a plurality of positioning means or bolts 20
are adjustably mounted on the horizontal portion of the L-shaped
plate 19 and the lower end of each bolt 20 is fixed to the upper
surface of a flexible guide plate 21. Accordingly, various cam
surfaces are selectively formed on the lower surface of the guide
plate 21 by adjusting appropriately the positions of the bolts 20.
During the roving winding operation, the lower surface of the guide
plate 21 is always in contact with the roller 18, and the latter is
successively rolled on the lower surface of the guide plate 21 with
movement of the rack 10. A spring 26 is stretched between pins for
connecting respectively the belt shifter 7 and the rack 10 to the
link mechanism to prevent further expansion of the elements 8 and 9
of the link mechanism when the rack 10 is returned to the position
of initiation of winding after completion of one winding cycle. In
the device of this invention, however, further expansion of the
link elements 8 and 9 can also be effectively controlled, if
another guide plate designed to have likewise a cam surface is
disposed to form a groove-like path in which the rotary roller 18
is engaged. In this case, at the step of returning the rack 10 to
the position of initiation of winding, further expansion of the
link elements is restricted by the lower and upper cam surfaces;
and hence, provision of the spring 26 is not absolutely necessary
in the device of this invention.
The link mechanism need not indispensably be of the two-element
construction, but it may be, for example, of the four-element
construction. A screw rod or the like can be used instead of a
combination of the rack 10 and pinion 13 for movement of the belt
shifter 7.
In operation, in pause of the engagement of both the ratchets 16
with the ratchet wheel 15, the weight 11 is lowered to rotate the
pinion 13 and the rack 10 is moved toward the left in the drawing
by a distance corresponding to the amount of the rotation of the
pinion 13. Since the guide plate 21, the cam surface thereof being
adapted to the spinning conditions of the roving to be wound, is
always in contact with the roller 18, the belt shifter 7 causes an
irregular movement of the belt 3 in correspondence with the ups and
downs of the cam surface. More particularly, when the roller 18
rises on the cam surface of the guide plate 21, the link elements 8
and 9 are contracted and the shift amount of the belt shifter 7 is
reduced, and when the roller 18 descends the cam surface, the link
elements 8 and 9 are expanded; hence, the movement or displacement
of the belt shifter 7 is made larger by a distance proportional to
the expansion of the links 8 and 9 than that of the rack 10.
Accordingly, in case various rovings differing in spinning
conditions are wound by a common flyer frame, if a cam surface
corresponding with the conditions of the individual roving to be
wound is formed in advance on the guide plate 21 by adjusting the
bolts 20, the shift amount of the belt 3 is automatically adjusted
and the roving winding tension can be maintained at a constant
level throughout the winding operation, i.e., from beginning to end
of winding.
Although in the above embodiment the cam surface of the guide plate
is adjusted in correspondence with the conditions of the roving to
be wound, it is also possible according to the invention to select
a proper guide plate depending on the spinning conditions from an
assortment of guide plates each having a cam surface previously
adapted to respective spinning conditions.
Another embodiment of the guide plate 21 is shown in FIG. 3. In
this embodiment, brackets 23 each having an adjustment long slot or
hole 22 are fixedly secured to the machine frame and respective
connecting pins 25 provided to the ends of connected link elements
24 are adjustably fitted in corresponding holes 22 in a
conventional manner. In this structure, if the vertical positions
of the connecting pins 25 are appropriately adjusted, various cam
surfaces can be formed on the surface of each link element 24 as in
the foregoing embodiment. Thus, if the links 24 are so adjusted
that an appropriate cam surface is formed depending on the spinning
conditions of a roving to be wound, the roller 18 rolling while
making contact with the lower surface of each link 24 moves up and
down and therefore, during the winding operation, the belt shifter
7 can move the belt 3 with a displacement smaller or larger than
that of the rack 10, resulting in obtaining good wound rovings.
Also, in this embodiment, it is possible to provide another link
mechanism below the link mechanism including the link elements 24
to form a groove-like path between both the link mechanisms for the
roller 18 to be fitted therein. In this case, the spring 26 need
not be provided. In FIG. 3, the guide means comprises a link
mechanism including three link elements, but the number of the link
elements can be increased or decreased according to the need.
In each of the foregoing embodiments, the roller 18 forming part of
the link mechanism is engaged with the guide means composed of the
guide plate 21 or the guide links 24, but another part of the link
mechanism can be engaged with the guide means. Further, the fitting
position of the guide means is not limited to the position above or
below the link elements 8 and 9 but it may be located at a position
lateral to these link elements. In other words, it is sufficient if
the guide member is disposed at a position apart by a certain
distance from the movement locus of the link elements 8 and 9 so
that it is engaged with at least a part of the link mechanism
including the link elements 8 and 9.
As is apparent from the foregoing description, in the device of
this invention, the integral fixation of the belt shifter and rack,
which is generally adopted in the conventional devices, is
separated and divided and both the separated members are connected
with each other through a link mechanism including at least two
link elements, and concurrently, a guide means forming a cam
surface at a position apart by a certain distance from the movement
locus of the link elements is disposed so that it is engaged with
the link mechanism. In the above structure, if the cam surface of
the guide means is appropriately selected or conditioned, during
the winding operation, the belt shifter can be moved irregularly in
the state desired so that the roving winding tension can be
maintained at a constant level throughout the winding operation,
i.e., from beginning to end of winding, with the result that a good
wound roving free of unevenness can be obtained. Further, the
device of this invention is easily applicable to the conventional
flyer frames if only minor modifications are made, and the changes
of the roving winding tension can be compensated easily at any time
with use of the device of this invention which has a very simple
structure as compared with the conventional device. Thus, various
advantages can be attained by the device of this invention.
While the invention has been illustrated and described with
reference to preferred embodiments thereof, it is to be understood
that various changes in the details of constructions and the
arrangement and combination of parts may be made without departing
from the spirit and scope of the invention. What we claim is:
* * * * *