U.S. patent number 3,765,458 [Application Number 05/233,262] was granted by the patent office on 1973-10-16 for gripper shuttle carrier.
Invention is credited to Erwin Pfarrwaller, Georg Ziegler.
United States Patent |
3,765,458 |
Ziegler , et al. |
October 16, 1973 |
GRIPPER SHUTTLE CARRIER
Abstract
For the return of gripper shuttles from the catching to the
picking side of a loom, with the help of endless roller chain,
gripper shuttle carriers detachably affixable to the chain include
a web and a pair of flanges which resiliently engage with side
bars, rollers or pins of the chain and without the removal of any
links from the chain.
Inventors: |
Ziegler; Georg (Horriwil,
Solothurn, CH), Pfarrwaller; Erwin (Winterthur,
CH) |
Family
ID: |
4264732 |
Appl.
No.: |
05/233,262 |
Filed: |
March 9, 1972 |
Foreign Application Priority Data
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Mar 16, 1971 [CH] |
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003846/71 |
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Current U.S.
Class: |
139/439;
198/867.11 |
Current CPC
Class: |
D03D
47/24 (20130101) |
Current International
Class: |
D03D
47/24 (20060101); D03D 47/00 (20060101); D03d
047/24 () |
Field of
Search: |
;139/12,125,126
;198/176,189X |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Jaudon; Henry S.
Claims
We claim:
1. A gripper shuttle carrier removably affixable to a roller chain
made up of roller links comprising inner side bars and of pin links
comprising outer side bars, said carrier comprising a web and two
flanges facing each other across an open slot, each of said flanges
having a length greater than that of said outer side bars and
having formed therein, below the surface thereof facing said slot,
a recess for the reception of the ends and of a major fraction of
the periphery of an outer side bar of a pin link of the chain.
2. A carrier according to claim 1 wherein said flanges further have
formed therein at opposite positions across said slot and within
said first-named recesses, deeper recesses for the reception of the
pins of a pin link of the chain.
Description
The present invention pertains to carriers for the return of
gripper shuttles from the catching to the picking side of a loom
with the help of an endless chain.
In gripper shuttle looms a succession of pirnless shuttles is shot
through the shed from the picking to the catching side of the loom
where they are received in a catcher. Each shuttle pulls a weft
thread through the shed. From the catcher the shuttles are returned
by a carrier mechanism to the picking side of the loom, where they
return to the working cycle. The carrier mechanism may include an
endless roller chain by means of which the shuttles are so
returned. Such chains typically include a pair of outer side bars
in one link, a pair of inner side bars in the adjacent link, a pair
of outer side bars in the third link, and so on.
In mechanisms of this type heretofore proposed, each shuttle
carrier has been inserted into the chain in place of a link
therein, and more particularly in place of a link including two
such outer side bars. Thus to insert the carrier into the chain,
the pins or rivets at the end of each link to be so replaced must
be removed along with the side bars, the pins then being replaced
when the carrier element has been inserted in place of those side
bars. The carrier consequently bears the tensile stress in the
chain.
In another construction heretofore proposed, each carrier is
inserted into the gap between the side bars of a link and hence
between two adjacent rollers of the chain. This means, however,
that the teeth of the sprocket wheels which drive the chain cannot
enter between such adjacent rollers and can engage instead only
those gaps not occupied by shuttle carriers. With such a
construction therefore the chain drive must be altered, with the
substitution of different sprocket wheels. For example the number
of teeth may have to be reduced by half, which would require each
tooth to carry twice the stress.
It is an object of the invention to improve gripper shuttle return
mechanism.
In accordance with the invention, the carriers are affixed each to
one link in the chain by means of either positive coupling or
non-positive coupling, such as elastic coupling. Such a
construction makes it possible to affix the carriers to the chain
without disassembling the chain, and in particular without removing
pins and side bars from the chain. For this reason likewise the
carrier of the invention is not subjected to the tensile stress in
the chain. The tensile stress continues to be borne by the side
bars of the chain itself. Moreover, there is no necessity for
changing the sprocket wheels to wheels with an altered number of
teeth or an altered shape therefor.
Since the shuttle carrier of the invention is not required to bear
the tensile stress in the chain, it can be of lighter construction
and its dimensions need only be sufficient for it to bear the
stress inposed upon it by the shuttle being carried.
If one carrier is damaged it can readily be removed from the chain
and replaced by another one. It is necessary only to release the
positive or nonpositive coupling of the carrier to the chain. For
example by means of a screw driver, the carrier to be removed is
sprung out of engagement and then withdrawn.
The fact that the carrier of the invention needs to be dimensioned
only for the stress encountered by it in carrying the shuttle
entails an additional advantage, namely that the carrier may be
made of synthetic material such as the polyamides or
tetrofluoroethylene. Either positive or nonpositive coupling of the
carrier to the chain is easily achieved with such synthetic
materials.
The carrier of the invention need incorporate no particular
elements such as screws or rivets for its fastening to the chain.
In particular cases as hereinbelow described for example with
references to FIGS. 6 and 7, supplementary fastening means such as
screws and rivets may however be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
the invention will now be described in further detail and in terms
of a number of presently preferred exemplary embodiments with
reference to the accompanying drawings in which:
FIG. 1 is a sectional view through a shuttle carrier in accordance
with the invention taken on the section line A--A of FIG. 2;
FIG. 2 is a sectional view taken on the line B--B of FIG. 1;
FIGS. 3A, 3B, 3C and 3D are perspective views illustrating
successive phases in the application to a chain of a carrier
according to FIGS. 1 and 2;
FIG. 4 illustrates another form of carrier according to the
invention;
FIG. 5 illustrates in perspective still another carrier according
to the invention, shown in proximity to a chain to which it can be
removably affixed;
FIG. 6 is a view in elevation of still another carrier according to
the invention; and
FIG. 7 is a plan view of the carrier of FIG. 6.
Referring to FIGS. 1 and 2, the shuttle carrier generally indicated
at reference character 1 may be made of a suitable synthetic
material such as an acetyl resin, for example the resin sold under
the trademark DELRIN. The carrier includes an upper web portion 2
and flanges 3 and 4, together with an extension 5 (FIG. 2) for
carriage of a gripper shuttle.
The flanges 3 and 4 may be elastically displaced from their
full-line to their chain-line positions in FIG. 2, and when
released will return to their full-line positions. There thus
exists between the two flanges an open slot or channel, as
indicated at 40 in FIG. 2.
Each of the flanges 3 and 4 is inwardly bounded by an innermost
plane surface 9 (FIGS. 1 and 2), i.e. a surface near-est the
opposite one of those flanges and hence nearest the reader in FIG.
1. Surface 9 is parallel to the plane of FIG. 1. When the carrier
is in place on the chain, the two faces 9 are parallel to each
other and perpendicular to the plane of FIG. 2. Those portions of
the surface 9 at the longitudinal ends of the carrier, i.e. at the
left and right ends thereof in FIG. 1, accommodate, with suitable
clearance, the exterior faces of the inner side bars 26 belonging
to two roller links generally in-dicated at 8 in FIG. 3A. These two
roller links are separated by a pin link generally indicated at 10,
in FIG. 3A, having outer side bars 7. It is over such a pin link
and to such a pin link that the carrier is fastened by snap action,
i.e. by detent action. See FIGS. 2 and 3D.
Below the surface 9 each flange is provided with a first recess,
bounded by a plane surface 6 (parallel to the plane of FIG. 1) and
by a curvilinear cylindrical edge 29 perpendicular to the plane of
FIG. 1. The edge 29 includes end portions 15 and 25 behind which
(i.e. on the side toward the top of the sheet in FIG. 1) is held,
on each of flanges 3 and 4, one of the outer side bars 7 of the pin
link to which the carrier is affixed, once that link has been
snapped into the slot 40 between the two flanges 3 and 4. The first
recess, bounded by the plane surface 6 and by the cylindrical edge
29 with its end portions 15 and 25, thus constitutes a recess into
which the ends and a major fraction of the periphery of an outer
side bar 7 of a pin link 10 may be received.
Below the surface 6 each flange is provided with a second recess,
bounded by a plane surface 17 parallel to the surfaces 6 and 9 and
by a curvilinear cylindrical edge 18 perpendicular to the plane of
FIG. 1.
Below the surface 17 each flange is provided with third and fourth
recesses of circularly cylindrical shape, generally indicated at 41
and 42 in FIG. 1, and bounded each by a plane surface 12 parallel
to surface 9 and by a circularly cylindrical edge surface 11
perpendicular to the plane of FIG. 1. The recesses 41 and 42 are
spaced on centers, and are of the proper diameter, to accommodate
the ends of the two pins or rivets 13 and 14 of a link in the
chain, as indicated in FIG. 3D.
An oblique surface 22, functioning as an inclined plane and oblique
to the plane of FIG. 1, extends approximately from the plane 6 at
the lowermost limit of the flange in FIG. 1, approximately to plane
9 in the vicinity of the portion 25 of edge 29.
The two flanges 3 and 4 may thus be mirror images of each other in
the section plane A--A of FIG. 2.
The carrier is shown in perspective in FIG. 3A above a pin link 10
of the chain having outer side bars 7, to which link the carrier is
to be affixed. The link comprises side bars 7 and pins 13 and 14
with their rollers 27. To apply the carrier to the chain, the chain
is advantageously folded as in FIG. 3B, and the pin 13 at one end
of the outer side bar link to which the carrier is to be fastened
is engaged between the facing surfaces 17 of the two flanges, the
flanges being spring apart for this purpose. Pin 13 is then forced
up the channels defined by the surfaces 17 and their edges 18 and
19 until the pin snaps into the circular recesses 41. The resultant
state of affairs is illustrated in FIG. 3C, the flanges having
returned to the unstressed, full-line position shown therefor in
FIG. 2.
The outer surfaces of the side bars 7 now lie, so far as they are
within the slot 40 between the two flanges, against the opposed
surfaces 6, as indicated by the phantom, chain-line showing of a
side bar 7 in FIG. 1. Pin 14 at the other end of the link on which
the carrier is now partly engaged is thereupon similarly forced up
between the opposing surfaces 17, the righthand ends (21, in FIG.
1) of the side bars 7 riding in the process over the facing oblique
surfaces 22 until those ends 21 snap into the recesses defined by
surfaces 6 and edges 29, i.e. inwardly of portion 25 of edge 29 on
each flange, pin 14 simultaneously snapping into recesses 42. The
flanges thereupon again return to the full-line position shown
therefor in FIG. 2.
The foregoing processes occur simultaneously at flanges 3 and 4
with the result that the carrier becomes completely seated on the
chain, as indicated in FIG. 3D.
The carrier is thus positively coupled to the chain. Any desired
number of carriers can be so fastened to the chain.
To remove the carriers, the reverse procedure is followed. By means
of a screw driver inserted in the direction indicated by the arrow
33 in FIG. 2, the right-hand ends 21 of the links 7 are snapped out
and the left-hand ends 16 are then similarly snapped out.
Folding of the chain for application of the carrier thereto is not
absolutely necessary. Upon a sufficient spreading of the flanges 3
and 4 the carrier can be snapped directly over the chain, so that
it is not necessary to relieve the chain of the tensile stress
therein even for the purpose of applying the carriers thereto or
removing them therefrom.
In the embodiment illustrated in FIG. 4, the spacing on centers of
the pins 13 and 14 is denoted T whereas the length of each carrier
at the upper surface thereof, outside of the chain, is denoted 2T.
In straight runs of the chain therefore the carriers provide a
smooth and continuous surface which can be used for load carrying
purposes. The carriers are beveled as indicated at 35 so that they
can negotiate the curved portions of the chain path.
If the carriers are made of sufficiently elastic material, or if
the flanges 3 and 4 are thick enough, the sockets 41 and 42 for the
pins 13 and 14 may be made large enough as to accommodate the side
bars 7.
This is illustrated by the dash-line indication 39 in FIG. 2 which
is without the stepped shape resulting from the presence of
surfaces 6, 18 and 17. That is, each flange will be provided with a
single recess having the depth of the surfaces 12 in FIG. 1 and
bounded by a curvilinear edge as indicated at 19, 29 and 25.
In another embodiment the flanges 3 and 4 are made relatively
stiff, but are provided on the interior thereof (i.e. on the faces
of the flanges facing the slot 40) with inserts of elastic
material. These are shaped as hereinabove described to conform to
the bars 7 and pins 13 and 14, so as to provide a positive as
distinguished from a nonpositive or merely frictional coupling of
the carrier to the chain. The elasticity of these inserts will
permit the deformation thereof required for application of the
carrier to the chain and its removal therefrom.
The carrier may also possess stiff flanges and be provided with
recesses as indicated at 6, 29, and at 41 and 42 for positive
coupling. In such an embodiment the surface 17 will be of the depth
of the surfaces 12, the oblique surface 22 being retained but
formed on an elastic insert.
In still another embodiment according to the invention illustrated
in FIG. 5, the carriers are coupled over one of the inner pair of
side bars 26. In such an embodiment the carrier 1a is made to be
elastic lengthwise of the chain as indicated by arrow 44 in FIG. 5.
The carrier is thus hooked under the inner side bars 26 of one link
of the chain at one end 37 of those side bars, and sprung over the
other end 38 of those side bars. The flanges 3a and 4a of the
carrier should in such an embodiment have only the thickness of the
inner side bars 26 to avoid interference with the sprockets.
In the embodiment of FIGS. 6 and 7 the carrier 1b is provided in
the upper portion thereof with a slit 51 parallel to the long
dimension of the chain. With such a construction, the carrier may
be lighter in section so as to be more readily spread. After
application of the carrier to the chain, a rivet 52 may be inserted
as indicated in FIG. 6, outside the center line of the chain so as
to provide positive coupling of the carrier to the chain. With such
an embodiment however, removal of the carriers customarily requires
destruction of such rivets.
Screws may be employed in place of such rivets 52, to permit
tightening of the carrier to the chain and to permit its
non-destructive removal therefrom. Additional such rivets or screws
may be provided, for example as shown at 52a in FIG. 6.
The carriers may also be affixed to two side-by-side chains moving
together, forming bridging elements between them.
The invention thus provides a gripper shuttle carrier comprising a
body of elastic material re-entrantly-shaped for detachably
resilient engagement with a link of a chain. The carrier comprises
a web and two flanges which face each other across an open slot.
The flanges are engageable with a link of the chain, the flanges
being preferably recessed, for example as indicated at 12 in FIGS.
1 and 2, to lock into engagement with the chain by detent action
after flexure to bring the carrier flanges into position with the
link or elements thereof in the slot between those flanges. The
carrier may be susceptible of flexure crosswise of the chain, as in
the embodiment of FIGS. 1 and 2, for resilient engagement with side
bars of the chain, or it may, as in the embodiment of FIG. 5, be
susceptible of flexure lengthwise of the chain for resilient
engagement with two successive of the pins or rollers of the
chain.
The flanges face each other across an open slot which, in the
embodiment of FIGS. 1 and 2, extends lengthwise of the chain to
permit flexure of the carrier transversely of the chain, whereas in
the embodiment of FIG. 5, the slot may be regarded as extending
crosswise of the chain, the flanges being regarded in that
embodiment as including one the two hooked-shaped portions at the
left of the carrier and the other the two hook-shaped portions at
the right of the carrier.
While the invention has been described hereinabove in terms of a
number of presently preferred embodiments the invention itself is
not limited thereto, but rather comprehends all modifications of
and departures from those embodiments properly falling within the
spirit and scope of the appended claims.
* * * * *