US2518961A

US2518961A - Tension for loom shuttles

Info

Publication number: US2518961A
Application number: US58735A
Authority: US
Inventors: Richard G Turner
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1948-11-06
Filing date: 1948-11-06
Publication date: 1950-08-15
Anticipated expiration: 1967-08-15

Description

R. G'. TURNER y TENSION FOR Loou SHUTTLES Filed Nov. 6. 1948 1 Aug; 15,` 195o` INVENTOR RICHARD G. TUR/VER ATTORNEY Patented Aug. 15, 1950 TENSION FOR LOOM SHUTTLES Richard G. Turner, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application November 6, 1948, Serial No. 58,735

8 Claims.

` These pads may take the form of vertical members mounted for a limited amount of motion relatively to the shuttle and constructed with vertical edges which in the past have been substantially straight. When the shuttle is checked near the end of its night the pads because of the manner of their mounting and because of their momentum move angularly with respect to each other and pinch the weft thread sufliciently to cause breakage.

It is an important object of the present invention to form the pads with part of their vertical edges cut back slightly to avoid pinching of the weft when the pads move angularly with respect to each other.

With these and other Vobjects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein two forms oi the invention are shown,

Fig. 1 is a plan view of one end of the shuttle having the preferred form of the invention applied thereto, l

Fig. 2 is an enlarged transverse vertical section on line 2-2 of Fig. 1,

Fig. 3 is a detailed horizontal section on line 33, Fig. 2,

Fig. 4 shows the pads in horizontal section and indicates two different positions which they assume during running of the shuttle,

Fig. 5 is a perspective view of one of the pads,

Fig. 6 is a view similar to Fig. 4, but showing the modied form of the invention, and

Fig. 7 is a side elevation looking in the direction of arrow 1, Fig. 6.

AReferring particularly to Fig. 1, the shuttle S carries a bobbin B the weft W of which unwinds from the bobbin and passes through a threadon a support pin I6 fixed to the threader block II. The upper end of each pad is formed with a lateral extension or nger I'l which ts into an opening I8 in the threader block. The finger I'I does not fully occupy the opening I8 and permits some freedom of motion of the upper end of the pad.

Each pad is urged toward the other by a light compression spring 20 backed up by a screw 2l threaded into the block II, and each pad is provided with a substantially at vertical weft engaging surface 22 along which the thread moves horizontally or longitudinally of the shuttle when the latter is in flight.

As will be understood from Fig. 2 the extension or linger I1 of each pad is located at one side of a vertical line passing along the corresponding iiat surface 22, and when the shuttle is checked near the end of its iiight the nger I'I by reason of its momentum produces a slight rocking or angular movement of the pad. This rocking occurs with respect to both pads and the latter momentarily move from the full line position to the dotted line position shown in Fig. 4. In the past these pads have had continuous vertical straight edges adjacent to each other, and when the pads pivot on each other around their vertical edges as axes the edges pinch the weft and weaken it so that it is likely to break.

The matter thus far described is of usual construction and operates in the usual manner, the springs 20 determining the amount of frictional contact which the pads have with the weit thread and the pads being mounted freely so they can move angularly when the shuttle is checked in its flight.

In carrying the present invention into effect provision is made to prevent the angular movement of the pads from cutting the weft. This result is accomplished by remo-ving a part of the vertical straight edges heretofore used. The drawings show two means Yfor carrying the invention into effect, but the invention is not necessarily limited to the two forms shown in Figs. 4 and 6.

Referring particularly to Figs. 4 and 5, and considering one side of one of the pads, it will be seen that pad I 3 has an upper straight primary edge 30 which is more or less in vertical alignment with a lower straight primary edge 3I. These two edges or parts of pad I3 are spaced from each other by a 10W area or portion 32 which may be produced by chamfering the edge of the pad between the edges 3u and 3l. The effect of this chamfering is to produce a secondary edge 33 for the pad which is spaced from' a line joining the edges30 and 3l in the direction of the length of travel of the thread. Both sides of both pads are formed as already described, but the invention will operate if only one pad has its edges chamfered.

While the shuttle is in night the two pads Will be in the positions shown in full lines in Fig. 4, but when the shuttle is checked, as by engagement with the shuttle binder, the guide nngers Il due to their momentum' tend to move in the direction of shuttle travel faster than the'shuttle is traveling. This causes the pads to rock to the dotted line positions shown in Fig. 4. During this rocking the pads pivot on themselves by engagement of their upper and lower primary edges 3U and 3 I, respectively, but during this pivoting the secondary edge 33 of the chamfer of one pad moves away from the similar edge 33 of the other pad, thereby denning a small open space 38 through which the thread can move, and there is no opportunity for the thread to be pinched or broken.

In the modined form of the invention shown in Figs. 6 and 7 the primary vertical edges 4B and 4l correspond to the vertical edges 3!'and 3| of the preferred form, but the sides of theI pad are cut back as at G2 to provide secondary edges 43 similar to edges 33 of the preferred form. The operation of the modified formis substantially the same as that. of the preferred form, as will be understood from Fig. 6, where the full position of the two padsis that existing while the shuttle is in full night and wherein the dotted lines indicate the rocked position of the pads when the shuttle is checked. In the modined form the edges 53 which determine one of the horizontal limits of the surface which engages the thread moves away from the corresponding edge 43 of the other pad and a small opening is denned for the thread.

The pads are free to move angularly with respect to each other whenever the shuttle is checked, whether it be moving to the right'or left across the loom and both vertical edges of each pad will be modified as set forth hereinbefore so that whether the pads rock from the full to the dotted line position shown in Fig. 4, or whether they rock in the opposite direction due to the fact that the shuttle is-moving reversely, they will nevertheless separate to open a sm'all gap through which the weft can pass without being pinched.

From the foregoing it will be seen that the invention sets forth a tension pad for a loom shuttle constructed in such manner that angular movement of the pads with respect to each other and about an axis determined by mutual engagement of parts of the pads will effect a separation of those parts of the pad across which the weft passes. This result can be accomplished either by chamfering the edges of the pads as in the preferred form of the invention, or by removal of a small part of the sides of the pads as in the modified form of the invention.

Having thus described the invention it will' be seen that changes and modincations of the foregoing specinc disclosure may be made without departing from' the spirit and scope of the invention.

What is claimed as new is:

1. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, said pads having adjacent vertical edges around which the pads have angular movements when the shuttle is checked in its night, and said pads having nat weft engaging faces which terminate out of vertical alignment with said edges and move apart to denne a space for the thread when the pads have said angular movements.

2. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, said pads having upper and lower engaging parts around which said pads have angular movements when the shuttle is checked near the end of its travel, said pads having portions thereof between said parts which move away from each other to denne a space for passage of the weft when the pads have said angular movements.

3. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, at least one of said pads having upper and lower parts engaging the other pad and having an angular movement around said parts when the shuttle is checked in its night, said one pad having a portion thereof between said parts which moves alway from the other pad to denne a space for the weft when said one pad` has said angular movements.

4. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, each pad having vertically spaced vertical edges adjacent to similar edges on the other pad and the pads having angular movements around said edges when the shuttle is checked near the end of its night, each pad having a nat thread engaging surface and the pads being so formed that the parts thereof engaging the weft move apart to denne a space for the thread when the pads have said angular movement.

5. In weft tension mechanism. for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, said pads having adjacent vertical edges and having weft engaging faces which terminate at points spaced longitudinally of the shuttle from said edges, said pads having angular movements about said edges when the shuttle is checked-in its night and the faces of the pads moving apart to denne a space for the weft when the pads have said angular movements.

6. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair `of vertically extending tension padsV mounted on the block, at least one of said pads having a primary edge below the path of travel of the thread through the threader block and having a weft engaging face terminating in a secondary edge above said primary edge and spaced from the latter longitudinally of the shuttle, said one pad having an angular movement around said primary edge when the'shuttle is checked in its night and the secondary edge moving away from the weft to avoid injury thereto.

'7. In weft tension mechanism for a loom shuttle having a threader block with a thread passage therethrough, a pair of vertically extending tension pads mounted on the block, each pad having a primary edge below the path of travel` of the thread through the threader blockgand having a vertically extending weft engaging face type having a threading block mounted in one end thereof which threading block is provided with a thread channel through which the lling yarn passes from the bobbin to the outlet, and spring pressed tension members loosely mounted 6 in the threading block and between which the lling yarn passes, said tension members having their coacting faces shaped to provide relatively Wide portions at the top and bottom and a relatively narrow portion therebetween.

RICHARD G. TURNER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES pATENTS Name Date Kaufmann Oct. 29, 1946 Number