US1824066A - Take up mechanism - Google Patents

Description

Sept. 22, 1931. F. ASHWORTH 1,324,066 I TAKE-UP MECHANISM Original Filed May 19 1920 3 Sheets-Sheet, l

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TAKE-UP MECHANISM Original Filed May 19 1920 3 Sheets-Sheet 2 Sept. 22, 1931. F. ASHWORTH 1,824,066

TAKE-UP MECHANISM Original Filed May 19, 1920 3 Sheets-Sheet 5 Patented Sept. 22, 1931 UNITED STATES PATENT OFFICE FRED ASHWORTH, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- OHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY TAKE UP MECHANISM Original application filed May 19, 1920, Serial No. 382,558. Divided and this application filed November 23, I

1928. Serial This invention relates to an improvement in take-ups for sewing machines.

The object of the invention is to improve and simplify the construction of take-ups for sewing machines.

The several features of the invention are hereinafter described and particularly pointed outin the claims.

In the drawings the invention is illustrated as embodied in a lock stitch outsole shoe sewing machine, a sufficient portion thereof being shown to enable the invention to be clearly understood, and in which Fig. 1 is a vertical sectional view of a portion of such machine; Fig. 2 is an enlarged front elevation showing the improved take-ups Fig. 3 is a detail front elevation of the take-up shown at the limit of its retracting movement, and Fig. 4 is a right side elevation of a portion of the machine.

The general features of construction of the illustrated machine are preferably those illustrated and described in my co-pending application, Serial No. 382,658, filed May 19, 1920, of which the present application is a division.

The take-up comprises a pair of rotatable disks 10, 12 which are centrally secured together by means of screws 14 threaded into the end of a rearwardly and upwardly inclined' shaft 16 journaled in bearings in brackets 18 on the frame of the machine and held from longitudinal movement by means of a collar 20 secured to the shaft and interposed between the brackets 18 Fig. 1) The disks 10, 12 are provided with peripheral contacting ribs 22. The disk 12 is of resilient material and is provided with a series of equally spaced apertures which receive the ends of pins 24 carried by the disk 10, the annular space between the ribs 22 and the pins 24 forming a thread passage. The stretch of thread leading from the supply to the take- ,up disks passes over a thread truck-26 mounted on one end of a lever 28. The lever 28 is pivotally mounted on a cap screw 30 -which is threaded into an axil aperture in the inclined shaft 16. In order that the thread truck 26 may be positioned{substantially in a'linement with the ribs22, the disk 12 is cut away at 32. The disklO is provided with an elongated concentric slot 34 in which the stud that supports the thread truck works. To take up the thread and to set the stitch the take-up disks are rotated counter clockwise, and during this movement of the disks the lever 28 is carried therewith by the engagement of one end of the slot 34 with an extension of the stud 29 on which the thread truck 26 is mounted. As the disks are thus rotated counter clockwise the thread is wound up on the disks and is forced down between the ribs 22 to engage the pins 24. To give up thread to'the loop taker and other stitch forming devices the disks are rotated clockwise carrying the lever therewith by engagement of the other end of the slot 34 with the stud on which the thread truck 26 is mounted. During the rotation of the disks to the right, the stitch forming devices pull the thread from between the disks. The resistance ofiered by the ribs 22 to the passage of the thread laterally betweenthem in a direction radially of the disks results in a sufficient tension being placed on the thread to prevent any slack occurring. In order'to set the stitch on the welt side, the thread is tensioned as the needle loop passes over the top of the bobbin case. This is accomplished by the end 36 of the lever 28 being carried by the disks against a yielding abutment near the limit of the rotation of the disks in a clockwise direction which arrests the movement of thelever relatively to the disks. This abutment comprises a bell crank 38 (Fig. 4) pivoted at 40 on a bracket projecting from the frame of the machine. The bell crank is provided with an arm 42, the end of which is adaptedto be engaged by thelever28. The bell crank 38 is urged in a direction to resist the rotation of the lever 28 by means of a coiled spring '44 engaging the under side of the arm 42. The movement of the bell crank 38 by the spring 44 is limited by the engagement of a stop screw 46 threaded into a depending arm of the lever with a rigid abutment on the bracket-that supports the bell crank lever.

The amount of tension placed on the thread as it passes over the top of the bobbin case may be regulated by adjusting the stop screw 46. When the thread has passed over the top 01 the bobbin case, the take-up disks are rotated in a counter clockwise direction, the cycle of operations being repeated. The take-up disks are oscillated as above described by means of a crank 2% that forms an extension of the crank 169 that actuates the awl (Fig. l). The connection between the take-up disks and the crank 29% comprises a pinion 296 (Fig. 1) formed on the forward end of the inclined shaft 16 which pinion is engaged by a gear segment 297 projecting from a sleeve 298 pivotally mounted on a pin 300 secured to the frame. On the sleeve 298 is formed a bevel gear segment 302 which engages gear se ment secured to a rock shaft 306 mounted on the frame. The rock shaft 306 is actuated by an arm 308 secured thereto which is connected by a link 310 with the crank 294;.

In the operation or" the take-up, the takeup disks are rotated in a counter clockwise direction to take up the thread and then in a clockwise direction to give up the thread as described. In the illustrated machine the link 310 is actuated by the crank 29% and has a path of movement such that the taking up of the thread occurs while the crank 29a is rotating through an angle of approximately 70 degrees and such that the giving up of the thread occurs during the remainder of the rotation of the crank as will be apparent from an inspection of the drawings.

Having thus described the invention, what is claimed is V r 1. A lock stitch sewing machine having, in combination, stitch forming devices including a hook needle, a loop taker, and a take-up mechanism comprising a lever, a guide roll mounted on one end of the lever over which the thread passes, means for turning the lever in adirection to give up thread to the stitch forming devices and loop taker, and a yielding abutment acting to limit this move ment of the lever before the loop leaves the loop taker to place a strain on the thread.

2. A lock stitch sewing machine having, in combination, stitch forming devices including a hook needle, a loop taker, and a takeup mechanism comprising a pair of disks having peripheral portions yieldingly pressed together, a series of pins carried by one of the disks and spaced from said peripheral portions to form a thread passage, means for rotating the disks is a direction to cause the thread to wind up on the disks and to enter the thread passage to pull the loop from the loop taker and set the stitch, and for rotating the disks in the opposite directionto give up thread to the stitch forming devices, the yieldingly pressed portions of the disks acting to tension the thread as it leaves the thread passage.

3. A lock stitch sewing machine having, in

combination, stitch forming devices including a hook needle, a loop taker, and a take-up mechanism comprising a pair of disks having cooperating thread gripping peripheral portions, a lever having its pivot coaxial with the disks, connections between the lever and disks to cause the lever to turn with the disks and to permit a limited amount of relative movement between the lever and disks, a thread truck mounted on one end ofthe lever over which the stretch of thread leading from the supply to the disks passes, means for rotating the'disks and lever in a direction to pull the loop from the loop taker and to set the stitch, and for rotating the disks and lever in the opposite direction to pay out thread to the stitch forming devices and loop taker, and means for limiting the latter movement of the lever to place a strain on the thread before the loop leaves the loop taker.

i. A wax thread lock stitch sewing ma-- chine having, in combination, stitch forming devices including a hook needle, a loop taker and a take-up mechanism comprising a 1'0- tatable member having an annular peripheral thread passage, a lever having its pivot coaxial with tne rotatable member, a pin and slot connection between the lever and the rotatable member to cause the lever to turn with the rotatable member and to permit a limited amount of relative movement between the lever and the rotatable member, a guide roll mounted on one end of ti e lever over which the stretch of thread leading from the supply to the thread passage in the rotatable member passes, means for rotating the rotatable member and lever in a direction to pull the loop from the loop taker and to set the stitch and for rotating the rotatable member and lever in the opposite direction to pay out thread to the stitch forming devices and the loop taker, and means for limiting the latter movement of the lever to place a strain on the thread before the needle loop leaves the loop taker.

5. Alockstitch sewing machine having, in combination, stitch forming devices, takeup, means for actuating the take-up to give up thread to the stitch forming devices and to set the stitch, and gripping devices movable with the take-up through which the thread is drawn laterally of its length by the stitch forming devices as the thread leaves-the take up and whichmaintainthe stretch of thread leading from the take-up to the stitch forming devices under tension during the givingup action of the take-up.

6. A look stitch sewing machine having, in combination, stitch forming devices, thread take-up and slack thread controlling mechanism to give up thread to the stitch forming devices and to set the stitch, said mechanism comprising an oscillating wheel movable in one direction to wind up on the periphery thereof astretch of thread during the stitch setting action of said mechanism and movable in the opposite direction to permit the thread Ill) lira

Illl) to unwind during the action of said mechanism in giving up thread, and gripping devices carried by said wheel through which the thread is drawn laterally in a direction radially of the wheel by the stitch forming devices as it is unwound from the wheel, and which maintain the thread under tension during the giving up action of said mechanism.

7. A lockstitch sewing machine having, in combination, stitch forming devices, and thread take-up and slacktliread controlling mechanism acting to give up thread to the stitch forming devices, and to set the stitch, said mechanism comprising a wheel over which the thread passes, embodying thread tensioning gripping devices through which the thread is drawn laterally in a direction radially of the wheel by the stitch forming devices during the action of said mechanism in giving up the thread.

8. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a loop taker, and a take-up mechanism comprising a pair of disks having a peripheral thread passage between them, means for rotating the disks in a direction to pull the loop from the loop taker and set the stitch, and in the opposite direction to give up thread to the loop taker, and means acting before the needle loop leaves the loop taker to cooperate withthe loop taker to place a strain on the thread.

9. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a loop taker, and a takeup mechanism comprising a pair of disks having a peripheral thread passage between them, means for rotating the disks in a direction to pull the loop from the loop taker and set the stitch, and in the opposite direction to give up thread to the loop taker, and yielding means acting before the needle loop leaves the loop taker to cooperate with the loop taker to place a strain on the thread, said yielding means having provision for adjustment to vary said strain.

FRED ASHWORTH.

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