US2673691A - Short-traverse mechanism for bobbin winding machines - Google Patents

Description

G. C. JOYCE March 30, 1954 SHORT-TRAVERSE MECHANISM FOR BOBBIN WINDING MACHINES 2 SheetsSheet 1 Filed Dec. 8 1951 III E IINVENTOR. GLQVER C IJOYCE.

cs. c. JOYCE 2,673,691

SHORT-TRAVERSE MECHANISM FOR BOBBIN WINDING MACHINES March 30, 1954 2 Sheets-Sheet 2 Filed Dec. 8 1951 INVENTOR. GLOVER C JOYCE BY ATTY.

Patented Mar. 30, 1954 SHORT-TRAVERSE MECHANISM FOR BOBBIN WINDING MACHINES Glover 0. Joyce, Worcester, Mass., assignor to Whitin Machine Works, Whitinsville, Mass., a corporation of Massachusetts Application December 8, 1951, Serial No. 260,720

6 Claims. 1

This invention relates to the winding of bobbins to be used in automatic weft-replenishing looms. It i desirable that such bobbins be provided with a predetermined number of shorttraverse windings before the regular full-traverse winding is started. Such short-traverse windings provide sufficient thread in storage on the bobbin so that the thread remaining on a bobbin which is indicated for replenishment will not be exhausted before bobbin transfer takes place.

It is the general object of my invention to provide improved and relatively simple mechanism for producing short-traverse for the initial windings on a bobbin.

A further object is to provide improved means for determining the amount or yardage of thread to be placed in the short-traverse windings.

My invention further relates to arrangements and combinations of parts which will b hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which Fig. 1 is a plan view of my improved bunchbuilding mechanism;

Fig. 2 is a front elevation thereof;

Fig. 3 is a left-hand end view thereof;

Fig. 4 is an exploded perspective and partly diagrammatic view of the mechanism;

Figs. 5, 6 and '7 are detail sectional views, taken along the lines 5-5, 6-45 and 1-1 in Fig. 2; and

Fig. 8 is a detail sectional view, taken along the line 88 in Fig. 1.

Referring to the drawings, I have shown my improved bunch-building mechanism mounted on the frame of a winding machine W in which a bobbin B is mounted for high speed rotation by a driving spindle S. The thread or yarn Y is held on the bobbin by a thread guide G, which is normally oscillated between the limits shown in full and broken lines in Fig. 1.

The thread guide G is mounted in a lever 10 which is pivoted in a thread guide carriage C and which is oscillated by driving mechanism not shown.

It is the general object of the present invention to provide means for limiting th traverse of the thread Y while the winding machine is applying the first few windings or layers of thread at the butt of the bobbin B.

For this purpose, I provide a guide-wire [2 (Fig. 1) mounted in a bell crank M which is pivoted at ii on a fixed stud I6.. When the guidewire 52 is in thebroken-line position shown in Fig. 1, the thread guid q lays, the thread Y on 2 the bobbin for the full traverse of the thread guide, but when the guide-wire I2 is in the fullline position shown in Fig. 1, the winding is limited to a short traverse adjacent the butt of the bobbin B, as most clearly indicated in Fig. 2.

It will be understood that the normal or full swing of the thread guide G is unchanged by the operation of the bunch-building mechanism, but that for short-traverse the thread or yarn Y is confined as indicated at Fig. 2, so that it cannot follow the thread guide as the guide swings to the extreme left in Fig. 2 or away from the butt of the bobbin B.

The thread-engaging part of th guide-wire I2 (Fig. 1) is inclined with respect to the axis of the bobbin spindle S when the guide-wire is in operative position. This is important, as it prevents the initial windings from being piled up at one point on the bobbin and thus provides a more uniform bunch.

I will now describe my improved mechanism by which the guide-wire I2 is swung into and out of operative position, and by which the period of short-traverse winding is conveniently predetermined.

Referring particularly to Figs. 1 and 2, the bell crank M has a pin-and-slot connection to a plunger 20 mounted in the fixed frame of the winding machine W and supporting a spring 22 by which the plunger 20 is normally moved to the right in Fig. 1 to position the guide-wire l2 in its inoperative or broken-line position.

The end of the plunger 20 is engaged by the head 24 of an arm 25 mounted on a short shaft 26 (Fig. 4) which is rotatably supported in a fixed plate 21 and which is mounted in parallel relation to a timing shaft 30. A lever 33 (Figs. 4 and 6) is loosely mounted on the end of the short shaft 26 and has an upstanding arm 34 which is yieldingly held against a lug on a short arm 36 (Fig. 6) which is fixed to the short shaft 26. A spring 38 (Fig. 4) holds the parts 34 and 36 normally in yielding engagement but will yield if the arm 34 is rocked too far.

When the lever 33 is rocked, the arm 35 associated with the lever will be swung anti-clockwise as viewed in Fig.4, and will correspondingly move the arm 36, the shaft 26 and the arm 25 to shift the plunger 20 to the left in Figs. 1 and 4 and to thereby swing the guide-wire l2 to operative or full-line position to limit the thread traverse. The rocking of the lever 33 to thu operatively position the guide-wire I2iis effected by a'cam 40 (Figs. 2 and'3) on a camshaft ti which is normally stationary but which is released to 3 make a single revolution whenever the winding machine is stopped for bobbin-replacement.

The mechanism controlling the intermittent rotation of the shaft ll and the cam 40 i not disclosed herein, as it forms no part of the present invention. The connection between the cam 63 and the lever 33 includes a link 42 and a bell crank 43. With the described connections, the guide-wire l2 will be moved to operative or fullline position whenever the raised portion 40a of the cam 43 moves under the end of the bell crank 43.

A circular disc 50 (Fig. 4) is mounted on the timing shaft 33 and has a notched shoulder 5| normall engaging the upper end of the arm 36v previously described. When the arm 36 is swung outward by the rocking of the lever 33, the disc 5t and the timing shaft 30 are free to be rotated anti-clockwise by a spiral spring 54 (Figs. 4 and 8) having its inner end secured to the shaft 33 and its outer end secured to a fixed stud or other support 55.

Whenever the disc 53 is released, the disc 53 and shaft 33 are thus rotated anti-clockwise until a pin 5'! (Fig. d) in the disc 53 engages an arm 53 which is held in normal fixed position by a pin 30 inserted in a selected hole 6| (Figs. 4 and 2) in a circular series of such holes arranged in the plate 21 and concentric with the shaft 30.

Special provision is made for rewinding the spring 54 after each release of the timing shaft 33 and disc 53. For this purpose, a rod 65 (Fig. 4) is mounted parallel to and adjacent the timing shaft 30 and loosely supports a gear 63 and associated pinion 61.

The gear 66 has a driving connection (not shown) with the spindle S, so that the gear 66 is continuously rotated whenever the spindle S and bobbin B are rotated. An arm 68 is fixed to the rod 65 and supports a short shaft 69 having a gear l3 engaging the pinion 61 and having a finetooth pinion H engageable with arelatively large fine-tooth gear 12 on the timing shaft 33. A second arm 75 is fixed on the rod 65 and supports a swivel block it through which extends a bolt "ii having a head 18 pivoted at 19 to the free or swinging end of the lever 33. A spring 80 presses the block against a nut 82' threaded on the outer end of the bolt Tl.

When the lever 33 is swung upward about the axis of the shaft by engagement of the lever 53 (Fig. 2) by the cam lug 40a, such action rocks the rod 65 and causes the fine-tooth pinion H to momentarily engage the gear 12. Thi occurs at the moment when the toggle formed by the lever 33 and the bolt 17 is straightened. At the same time, the lever 33 swings the arms 34 and 36 outward to release the disc shoulder 51. This preliminary engagement of the pinion H and the gear F2 has no significance.

As the lever 33 continues to swing upward, it again shortens the toggle. The pinion 1| is thus withdrawn from the gear 12 and the spring 54 on the timing shaft can then rotate said shaft anti-clockwise until the stop pin 51 engages the normally fixed stop arm 58.

As soon as the cam projection 40a (Fig. 2) has passed beyond the end of the bell crank 43, the lever 33 (Fig. 4) is free to start downward, thus allowing the arm 36 to contact the periphery of the disc 50. This downward movement also straightens the toggle 33-'l1, so that the gear 12 is operativelyengaged by the pinion H. The toggle is then held straightened until the driving pinion II rotates the gear 12.. shaft 30 and disc 4 50 clockwise far enough so that the arm 36 can drop off of the shoulder 5|.

The lever 33 then completes its return or downward movement to initial position and the pinion H is again disengaged. A spring 85 (Fig. 2) may be provided to assist this disengaging movement.

At the same time, the arm 25 on the shaft 23 is moved clockwise to withdraw the plunger 23 and to thereby allow the guide-wire 12 to swing to inoperative or broken-line position.

General operation The general operation of my improved bunchbuilding mechanism may be deduced from the foregoing detailed description but may be briefly restated as follows:

When the winding of a bobbin B has been completed, rotation of the spindle S is automatically stopped to permit replacement of the bobbin. At the same time, the cam shaft 41 is started for a single rotation and such rotation brings the cam projection 4011 under the bell crank 33. The bell crank then acts through the link 42 to swing the lever 33 upward or anti-clockwise. This partially rotates the shaft 26, causing the plunger 23 to shift the guide-wire I 2 to operative or full-line position. At the same time the notched disc 52) is released, so that the spring 54 may rotate the timing shaft 33 anti-clockwise until the stud 5? on the notched disc 50 engages the adjustable stop arm 58. The cam projection 40a then releases the bell crank 43 and lever 33 and allows the lever 33 to shift the pinion H into engagement with the gear 12 on the timing shaft 33.

The parts remain in this position until the spindle S and bobbin B are automatically started in rotation to wind the bobbin. Thereupon the pinion ll will also be started to rotate and will rotate the gear or disc 12 and the timing shaft 33 clockwise until these parts have been returned to their original position. The arm 33 will then be swung in under the shoulder 51 by the spring and the parts will be returned to initial position with the pinion H out of engagement with the gear 12.

The length of time between the start ng of the spindle S and bobbin B in rotation to wind the bobbin, and the withdrawal movement of the guide-wire I2 is determined by the setting of the stop arm 58, which may be varied some 250 by selecting different holes 6| for insertion of the stop arm pin 60. The yardage of thread or yarn to be placed in the initial short-traverse winding or bunch on the bobbin may thus be variably and accurately controlled, as the additional length of thread or yarn for each adjustment step of the stop arm 58 may be readily predetermined.

One form of mechanism which may be used to give the cam shaft 4| a single revolution on spin dle stoppage is shown in my copending application, Serial No. 260,719, filed December 3, 1951, issued February 23, 1954, as Patent No. 2,670,147.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

l. A short-traverse mechanism for a bobbinwinding machine having a rotated bobbin spindle and a regularly oscillated thread guide associated with said spindle, which comprises a guide -wire movable into the traversing path of the thread for short traverse, means to move said guidewireto operative position and to maintain said .wirein fixed operative position for a predeterthe period during which said guide-wire remains in fixed operative position in predetermined respect to the number of spindle revolutions after such positioning of said guide-wire.

2. A short-traverse mechanism for a bobbinwinding machine having a rotated bobbin spindle and a regularly oscillated thread guide associated with said spindle, which comprises a guide-wire movable into the traversing path of the thread for short traverse, means to move said guidewire to operative position, a segmental circular timing disc effective when released and displaced from initial position to hold said guide-wire in said operative position, means to release said disc when said guide-wire is moved to said operative position, means to give said disc a predetermined angular setting movement as soon as it is released and while the bobbin spindle is at rest, means to thereafter return said disc at a predetermined speed to initial position and to thereby free said guide-wire for return to inoperative position, and means to return said guide-wire to inoperative position when thus released.

3. The combination in a short-traverse mechanism as set forth in claim 2, in which the predetermined setting of the timing disc i effected automatically while the bobbin spindle is at rest.

1. The combination in a short-traverse mechanism as set forth in claim 2, in which the predetermined setting of the timing disc is efiected automatically while the bobbin spindle is at rest, and in which the return movement of the timing disc to initial position begins simultaneously with the restarting of the bobbin spindle.

5. lhe combination in a short-traverse mechanism as set forth in claim 2, in which a normallyfixed stop limits the setting movement of said timing disc, and in which manual means is provided for setting said stop.

6. A short-traverse mechanism for a bobbinwinding machine comprising a winding spindle, a thread guide, means to give said thread guide full-traverse oscillations, auxiliary means to restrict the thread travel to short but definite traverse movements while said thread guide continues its full-traverse movements, a device to maintain said auxiliary means in operative position for a period predetermined with respect to the number of spindle revolutions, and means to return said device to normal inoperative position before bobbin-winding begins, and said latter means comprising a timing disc normally held in an initial position and means releasable on completion of bobbin-winding and efiective to automatically advance the auxiliary travel-restricting means to operative position, to release the timing disc for automatic rotational movement to a predetermined angular position, and to complete a driving connection between the winding spindle and said timing disc, and said disc being thereafter progressively returned to its initial position by said driving connection during a predetermined winding period of the bobbin and thereon releasing the travel-restricting means for return to its inoperative position.

GLOVER C. JOYCE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,179,459 Ryon Apr. 18, 1916 1,334,427 Wood Mar. 23, 1920 1,451,073 Korten Apr. 10, 1923 1,935,524 Schweiter Nov. 14, 1933 2,086,655 Wittmann July 13, 1937 2,520,134 Drake Aug. 29, 1950

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