US2457953A - Thread cutter for weft replenishing looms - Google Patents

Description

Jan. 4, 1949. R. G. TURNER 2,457,953

THREAD CUTTER FOR WEFT REPLENISHING LOOMS Filed April 2; 1947 INVENTOR RICHARD -e. TURNER ATTORNEY Patented Jan. 4, 1949 THREAD CUTTER. FOR, WEFT REPLENISH- mo. LOOMS Richard G. Turner, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application April 2, 1947, Serial No. 738,884

This invention relates to improvements in thread cutters for weft replenishing looms and it is the general object of the invention to provide a cutter controlled by the bobbin transfer mechanism.

A type of weft replenshing loom which has gone into common use employs a thread cutter operatingadjacent to the shuttle eye to sever the thread of the' outgoing bobbin at the time of replenishment. One form of this cutter utilizes a plate on the shuttle, and a spring stressed lever having a cutter blade which moves rearwardly against the plate under control of the transferrer arm when the latter has a transferring operation. Such a cutter is shown in prior patent to Payne No. 1,881,920, issued October 11, 1932. In another form a scissor type cutter on the lever is projected rearwardly into a cavity in the shuttle, as shown in my prior Patents Nos. 2,226,290 issued December 24, 1940 and 2,398,264 issued April 9, 1946. In

both forms of cutter the lever has an arm which is held against a part on the transferrer arm, and when the latter operates the part moves forwardly to enable the spring to rock the lever in a direction to move the cutter rearwardly. The rate of rearward movement of the cutter is therefore proportional to the rate of movement of the transferrer arm.

The transferrer arm is operated by the lay and its motion decelerates as the lay approaches front center. It is at this time that the cutter moves rearwardly, but because of the retarding motion of the lay the cutter moves too slowly for satisfactory cutting of certain kinds of yarn. It is an important object of the first feature of the present invention to control a cutter of the general type referred to in such manner that its rate of rearward movement toward the shuttle will be faster than that which has been possible heretofore.

It is another object of the invention to provide means operated by the transferrer arm which will positively move the aforesaid lever at the start of its motion. This second feature of the invention overcomes the inertia of the lever and effects prompt rearward motion of the cutter.

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

In the accompanying drawings, wherein the invention is illustrated as applied to cutter mechanism of the type shown in the Payne patent,

Fig. 1 is a plan view partly in section of part of a weft replenishing loom having the invention ap- 10 Claims. ((31. 139-263) 2 plied thereto and showing the parts in the position they assume at the instant of contact between the cutter and the plate on the advancing shuttle,

Fig. 2 is a detailed side elevation looking in the direction of arrow 2, Fig. 1,

Fig. 3 is an enlarged horizontal section on line 3--3 of Fig. 2,

Figs. 4, 5 and 6 are diagrammatic views illustrating the cutter, its controller and the shuttle carried plate in various positions, and

Fig. 7 is a. vertical section on line 1-1 of Fig. 2.

Referring to Fig. 1, the loom frame lll supports a weft replenishing mechanism not shown in. detail but having a foot I I bolted to the breast beam I2 on the loom frame. Extending upwardly from the foot II is a support l3 on which is mounted a horizontal transfer stud l4. The latter has piv- V otally mounted thereon the hub l5 of a transferrer arrn IE which extends rearwardly and overhangs the shuttle S as at H.

Depending from the transferrer arm are fingers 20 between which is a latch holder 2i pivoted on a stud 22 carried by the fingers. The transferrer latch 23 is secured to the holder and is normally in the down position shown in Fig. 2, but is raised to engage a hunter 24 on the lay 25 on replenishing beats of the loom. The lay reciprocates backwardly and forwardly in usual manner and as it approaches front center position on replenishing beats of the loom thebunter engages the latch 23 to rock the transferrer arm in a clockwise direction as viewed in Fig. 2, thereby moving the fingers 20 forwardly.

The shuttle is provided with a bobbin B having a weft thread W which leads to the right as viewed in Fig. 1 through a shuttle eye E and then to the left along the front wall of the shuttle to the selvage of the fabric F. The front wall of the shuttle is provided with a cutter plate 26 across which the weft extends, and a binder 21 provided with an opening 28 which registers with the plate when the shuttle is boxed as shown in Fig. l is mounted on the lay in the usual manner.

The transfer stud l4 has secured thereto an arm 39 by means of which a vertical stem 3i may be held in adjusted position by a set screw 32. The lower end of the stem has a head 391:0 one end of which is secured a torsion spring 34. A lever 35 is rotatable on the lower end of the stem 3| and is engaged by the other end of spring- 34. The lower end of stem 3| has a pin 38 or other similar means for supporting the lever 35. The spring tends to turn lever 35 counter-clockwise as viewed in Fig. 1.

The lever has a right hand arm 40 to which is adjustably secured a horizontal rod 4| the rear end of which is provided with a cutter blade 42. The left hand arm 45 of the lever is held by spring 34 in engagement with a controller or placer 46 secured to one of the fingers 26 of the transferrer arm.

The transferrer arm is normally raised and the controller 46 is in its rearmost position, thereby holding the lever 35 with cutter blade 42 in its normal forward position. When a transfer operation occurs controller 46 moves forwardly, thereby permitting spring 34 to rock lever 35 in a counterclockwise direction as viewed in Fig. 1 to move the blade 42 rearwardly through the opening 28 against the plate 26. i

The matter thus far described except the mounting for stem 3|, may be substantially as shown in the previously mentioned Payne patent. In th use of the cutter thus far described it is common practice to have the blade 42 as near the plate 26 as possible when the lay is on front center position on non-transferring operations of the loom. With such a settingthe blade is able to have maximum rearward movement into the path of the advancing shuttle and engage the play while the lay is still behind front center.

The control for lever 35 as heretofore made does.

not permit the cutter blade 42 to move rearwardly either at a sufficiently fast rate to effect cutting of all types of yarns, or effect cutting early enough in the advance motion of the lay to permit the outgoing bobbin to pull the weft thread W out of eye E.

In carrying the present invention into effect I modify the controller or placer 46 in such manner as to permit the blade 42 to move rearwardly through a greater distance and also at a faster rate than has been possible heretofore. This result is accomplished by providing the member 46 with an oblique surface 50 which is inclined forwardly and to the right as viewed in Fig. 1, or toward some point in front of the pivoted axis of lever 35. Placer 46 may have a surface parallel to the stud l4 and normally engaging the preferably rounded end 52 of arm 45, see Fig. 4. The surfaces 50 and 5| are forward of and displaced laterally to the left of stem 3|, and as the control member 46 moves forwardly the lever end 52 will leave the surface 5| and slide forwardly and along surface 50, see Fig. 5, thereby permitting the cutter blade 42 tomove rearwardly at a faster rate than would be possible without the oblique surface 50, and also to a position rearward of that which the blade might otherwise occcupy except for the surface 50. When the blade and plat engage each other as shown in Fig. 1, the weft thread W will be cut, and continued forward movement of the lay will cause plate 26 to rock lever 35 clockwise as the member 46 continues its forward movement. At front center the parts will be as shown in Fig, 6, lever end 52 being rearward of the controller 46. When plate 26 and controller 46 move rearwardly, lever 35 will rock counter-clockwise until its rounded end 52 engages surface 50, after which continued rearward motion of controller 46 will restore the parts to normal position.

When a cuttter controller is made according to the present invention it is found that the blade 42 strikes the plate 26 at an earlier time in the forward beat of the lay then ha been possible heretofore, and also moves at a rate greater than that existing in former constructions. It will be apparent that the rate at which the cutter blade 4 42 can move rearwardly is dependent upon two factors one of which is the rate of forward movement of controller 46 as determined by the lay, and the second of which is determined by the incline 50.

The second feature of the invention provides means for causing prompt rocking of lever 35 independently of spring 34 as soon as the transferrer arm begins to move forwardly. The controller 46 is provided with a rear arm or finger 55 having a surface 56 extending along the rear part of a pocket 51 which receives the rounded end.52 of lever arm 45. When the controller 46 is moved forwardly surface 56 positively causes forward movement of lever arm 45, thereby overcoming the inertia of the lever. As the controller advances the lever rocks to move the rounded.

will enter'the pocket to reestablish normal position of the parts.

While the invention has been described primarily in connection 'with cutter mechanism of the type set forth in the aforesaid Payne patent, i

it is not necessarily thus limited, and can be advantageously used with cutter mechanisms such as set forth in my previously mentioned patents.

From the foregoing it will be seen that the first feature of the invention provides simple means for controlling lever 35 in such manner that the rate of backward movement of the cutter blade 42 is determined by two factors one of which is derived from the retarding rate of the lay and the other of which is due to inclined surface 50. These two factors effect a greater amount of motion and a faster rate of movement than can be obtained in similar mechanisms as made heretofore. The earlier cutting .enables the outgoing bobbin to remove that part of its weft end which extends from the plate 26 through the shuttle eye, and the faster rate of cutting insures successful operation with a wide variety of wefts. It will also be seen that the second feature of the invention positively initiates a rocking movement of lever 35 as soon as controller 46 starts to move forwardly, thus overcoming the inertia of the lever and assisting the spring 34 to maintain arm 45 in contact with surfaces 5| and 50.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a filling thread cutter for a weft replenishing loom, a membermoved forwardly by the lay during a weft replenishing operation of the loom, a lever having a cutter element thereon, a pivot for the lever between the cutter element and one end of the lever, means on the member having a surface inclined forwardly and toward a point in front of said pivot, and resilient means holding said one end of the lever against said surface during forward movement of said member.

2. In a filling thread cutter for a weft replenising loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a pivot forward of the lay, a lever on the pivot having a cutter element on one side of the pivot and an arm on the opposite side of the pivot, means on the member having a surface inclined forwardly'and toward -a point in front of the pivot, and resilient means holding said arm against said surface during forward movement of the member to cause turning of the lever and rearward movement of said cutter element.

3. In a filling thread cutter for a weft repleni-shing loom, a member moved forwardly by the lay during a weft replenshing operation of the loom, a pivot located in front of the lay and at one side of the path of movement of said member, a lever on said pivot having an arm extending toward said path and having a cutter element thereon on that side of the pivot opposite said member, means on the member formed with a surface inclined forwardly and toward a point in front of said pivot, and resilient means holding said arm against said surface during forward movement of the member and causing turning of the lever to effect rearward movement of the cutter element.

4. In a filling cutter mechanism for a weft replenishing loom, a member moved forwardly by the lay during a replenishing operation of the loom, a pivot located at one side of the path of movement of the member, a lever on the pivot having a cutter element located thereon on that side of the pivot opposite to the member and having an arm extending toward said path'of the member, resilient means urging the arm toward said member and causing said lever to turn to effect rearward movement of the cutter element as the member moves forwardly, and means on the member having an inclined surface located forwardly of said pivot and engaging said arm and effective during forward movement of the member to enable the resilient means to move the arm forwardly at instantaneous rates of motion greater than the corresponding instantaneous rates of motion of the member.

.5. In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a pivot located forwardly of the lay and at one side of the path of movement of the member, a lever on said pivot having a cutter element on the side of the pivot opposite the member, means on the member presenting a surface forward of the pivot and inclined forwardly and toward a point in front of the pivot, an arm on said lever extending toward said member, and re- I silient means holding said arm against said surface during forward movement of the member to eifect turning of the lever and rearward movement of the cutter element. I

6. In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a pivot forward of the lay and at one side of the-path of movement of said member, a lever on said pivot having a cutter element on one side of the pivot and an arm on the opposite side of the pivot, resilient means holding said arm against the member, and means on the latter behind said arm effective at the beginning of forward movement of the member to move said arm positively by a force derived from the member to overcome the inertia of the lever and assist the spring to turn the lever as said member moves forwardly.

7. In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a lever pivoted in front of the lay and having a cutter element thereon and having an arm extending toward said member, resilient means urging said arm forwardly against said member, and means on the member behind said arm effective at the beginning of forward movement of the member to move said arm positively by a force derived from the member to overcome the inertia of the lever.

8. In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, means on the member defining a laterally opening pocket, a lever pivoted forwardly of the lay and having an arm normally located in said pocket, a cutter element on said lever, said pocket being located forwardly of the pivotal axis of the lever, and resilient means urging said arm forwardly, that part of the member behind the pocket operating during the first part of forward movement of the member to move the lever positively and said member during continued. forward movement thereof cooperating with said resilient means to effect movement of the lever in a direction to move said arm away from the back part of said pocket, thereby enabling said arm to move rearwardly when the member is in the forward part of the movement thereof.

9, In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a pivot forward of the lay, a lever on said pivot having 'a-cutter element thereon on one side of the pivot and having an arm on the other side of the pivot extending toward said member, said lever during a cutting operation occurring during forward movement of the lay on a replenishing beat rocking first in one direction to move the cutter rearwardly against a part carried by the lay and then rocking in the opposite direction as the cutter is moved forwardly by said part, means on the member defining a pocket located forwardly of the pivot and receiving the end of said arm, resilient means tending normally to move said arm forwardly against the forward part of said pocket, the rear part of the pocket at the beginning of forward movement of the member positively moving the arm forwardly to rock said lever and move the cutter rearwardly, said end of the arm due to the location of the pivot and pocket moving laterally away from the pocket as the member continues to move forwardly to clear said arm and enable said lever to move in said opposite direction when the member is near the front limit of its forward movement.

10. In a filling thread cutter for a weft replenishing loom, a member moved forwardly by the lay during a weft replenishing operation of the loom, a pivot forward of the lay and located laterally of the path of movement of said mem ber, a lever on said pivot having a cutter element thereon located on that side of the pivot opposite said path and having an arm extending toward said path, means on said member providing a laterally opening pocket and a surface inclined forwardly from the pocket and toward a point in front of the pivot and located forwardly of the pocket, said arm being normally located in the pocket, resilient means tending to move the arm forwardly, said pivot and pocket being said arm to move along said inclined surface as REFERENCES CITED the member continues to move forwardly to a A position laterally displaced from said pocket to The following references are of record in the enable the cutter element to move rearwardly and file of this patent: y then permit forward movement of the cutter ele- 5 I ITED ment and rearward movement of the arm to a UN STATES PATENTS position rearward of the pocket when the mem- Number m Date her is in the front part of its forward movement. 2,389,471 rn 1 Nov. 20, 1945 RICHARD G. TURNER.

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