US1137783A - Loop-retainer for sewing-machines. - Google Patents

Description

L. ONDERDONK.

LOOP RETAINER FOR SEWING MACHINES.

APPLICATION FILED FEB. 19. 1908.

1,137,783. Patented May 4, 1915.

2 SHEETS-SHEET I.

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LOOP RETAINER FOR SEWING MACHINES.

APPLICATION FILED FEB. 19, I908- Patented May 4, 1915.

2 SHEETS-SHEET 2 Q vi in eases LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A GORPO TION 0F ILLINC ES.

specification of Letters Eatent.

Patented May d, 1915.

Application filed February 19, 1908. Serial No. 416,727.

To all whom it may concern Be it known that I, LANSING ()NDERDONK, a citizen of the United States, residing at New York city, in the'co'unty of New York, State of New York, have invented certain new and useful Improvements in Loo -R-etainers for Sewing-Machines, of whic the following is a description, reference being bad to the accompanying drawing and to the letters and figures of reference marked thereon.

My invention relates to a thread retainer for sewing machines, and more especially to a thread retainer adapted'to coiiperate with a thread carrying looper so as to hold the needle loop back on said looper.

'l he object otmy invention is to provide a loop retainer which shall be durable and eliicient in operation.

A iurther object of my invention, is to provide a loop retainer which is mounted upon and movable with the looper carrier,

so as to always be held in proper position relative to the looper.

These and other objects will in part be obvious andwill in part be hereinafter more fully described.

in the drawings which'show by way of illustration one embodiment oi my inven' tion :Figure 1 is a front elevation of a sewing machine embodying my invention, certain parts being broken away for the sake oi? ole'arness. Fig". 2 is a detail view showing the loopcr carrier, the looper support and the 'loop retainer in side elevation. Fig. 3 is a detail view showing the looper carrier, the looper support, and the loop retainer together with its operating mechanism in top plan view. Fig. 4 is an end elevation of the looper carrier and the loop retainer together with its operating mechanism. Fig. 4 is a detail in side elevation showing the lower part of the retainer and its connection to the operating eccentric strap therefor. Fig; 5 isa similar view showing the modified form of mechanism for operating the loop retainer. Fig. 6 is a top plan view of the modified form of loop retainer operating mechanism.

'llhebed plate 1 has rising therefrom, the usual overhanging arm 2, on which is pivoted a needle lever d, which is oscillated fromthe main shaft 4i, by a suitable link 5. The needle bar 6, reciprocates in the forward end of the overhang arm in the usual manner and receives its movements from the needle lever 3. in the present embodiment of my invention, l have shown the needle bar as provided with two needles 7 and8, which are referably set diagonally to the line of feed Cooperating with the needles '7 and 8, are two loopers 9 and 10, which are mounted in a looper carrier 11 in the well known manner. Said looper carrier 11 is pivoted to the looper support 12, which is pivotally sup ported by brackets 13 and 14. Said looper support receives an oscillation from the main shaft 4, by a forked member 15, which engages an eccentric on the main shaft The looper carrier receives an oscillation from the needle lever 3, through'a link 16, which is pivoted to a rock lever 17 mounted in a bracket 18 on the bed plate 1. Said rock lever is connected to the needle lever extension by a link 19. t

The looper operating mechanism however, forms no part of my present invention and it is obvious that any other form of looper operating mechanism maybe used from that herein described, without in any way departing from the spirit of my invention. It will also be obvious, that instead of using a plurality of needles and a plurality of loopers, I may use a single looper and a single needle.

The loop retainers 20 and 21 cotiperate with the loopers 9 and 10 respectively. Said loop retainers are mounted in a loop retainer support 22, which is secured between proecting lugs 23' formed on the looper carrier 11, by a pivot bolt 2%. The pivotal connection between the looper carrier and the retainer support is such that the retainer support may be moved in a direction laterally of the loopers, but said retainer support moves with the looper carrier in its oscillation to give the loopers their longitudinal movement. lhe loop retainer support has a downward extension 25. An eccentric 26 is secured to the main shaft 4, at a point adjacent the downward extension 25- of the loop retainer and an eccentric strap 2? which encircles the eccentric 26 is provided with a ball stud 28, which engages a suitable hearing in the downward extension 25 of the retainer support.

it will be obvious from the above description, that as the looper carrier oscillatesback and forth to carry the loopers into the neoalong with said looper'carrier so that the loop retainers 20 and 21 will maintain a definite position relative to the loopers so far as their longitudinal movement is concerned.

It will also be noted that the connection between the ball stud 28 and the retainer support 22, is substantially in line with the longitudinal axis of the pivotal connection between the looper carrier and the looper support so that as the looper carrier oscillates abou its pivotal support, the loop retainer may oscillate about its connection with the eccentric-strap 27.

As the main shaft rotates, the eccentric .26 will give to said retainer support an oscillation which will carry the projecting ends of the loop retainer across the upper face of the looper and away from the same.

The eccentric 26, for operating the retainers, is so timed that as the loopers move forward into the needle loops, said retainers are moved away from the loopers so as to allow said loopers to move freely into the needle loops. When however, the loopers start on their rearward movement, the loop retainers are moved forward across the upper face of the loopers and in front of the needle loops, that is between the needle loop on the looper and the point of said looper,

its the loopers are movedbackward the retainer maintains its position across the face of the looper and holds the needle loops back on said loopers, until the needles on their next descent have entered well into the triangle formed by the looper thread extending from the eye of the looper to the previous needle puncture as one side of the triangle, the looper body as the second side of the triangle and the needle loop around the looper body and extending to the previous needle puncture as the third side of the triangle. After the needles are well down into said triangle the loop retainers are moved away from in front of the needle loops on the loopers, and the needle loops are then allowed to slip forward and be shed from the looper by its continued backward movement.

In Figs. 5 and 6, if have shown a diderential mechanism for giving said retainers their oscillation upon the looper carrier. Said mechanism comprises an eccentric 29 mounted on the main shaft 4 which has an eccentric strap 30 cocperating therewith.

. The outer end of the eccentric strap 30 is connected to a ball stud formed on an arm of the rock lever 40. The opposite end of the rock lever ll) is p ovided with a pivoted stud having upwarc'" ly extending ears 41 and 42. I V

A link as has one end thereoi pivoted be tween the ears t1 and t2, the opposite end is provided with a ball stud 44 engaging the downward extension 25 of the retainer support 24. As the eccentric 29 oscillates, the lever is rocked. and the pivotal connection between the lever 40 and link 43 is moved toward and away from a line passing through the pivotal support of the rock lever and the pivotal connection of the link 43 and the retainer support. It will there fore, be seen that the movement imparted to the retainer through this mechanism is a differential movement, that is a movement which is relatively quick across the upper face of the looper into position to retain the needle loop with a relatively slow movement of the retainer, when moved away from the looper with a dwell if desired, at this end of the stroke of the retainer.

The looper must be properly set so as to coiiperate with the needle as it moves forward into the needle loop. It often happens in the course of construction, that the body of the looper varies slightly in thickness and owing to the fact as above noted, that the looper must necessarily be 'set in a definite position relative to the needle, some means extraordinary thick looper should be placed in the machine.

As a means for adjusting the throw of the retainer, I have provided the downwardly projecting portion of the loop retainer carrier, with an enlarged slotted'end, as shown in Figs. 4: and 4 Located in said slotted end, is a block 25*, which receives the ball stud 28. A screw 25 passing through the ends of the extension 25 of the retainer, serves to clamp the block 25 in adjusted positions.

When it is desired to give the looper a little greater throw, the block 25 is adjusted in a direction toward the axis of the loop retainer. This adjustment shortens the leverage and conveys to the retainer, a greater throw. 0n the other hand, if the block 25 be adjusted away from the pivotal support of the retainer, the stroke of the retainer will be shortened. ltwill thus be seen, that bring vthe retainer into proper position across the upper face of the looper, for holding the needle loop back on the looper.

As a means for changing the timingof the loop retainer relative to the looper so that said retainer will be moved across the upper face of the looper at the proper time and also release the needle loopat the proper time, l have mounted the eccentric 26 on a sleeve 26', which is secured-to the main shaft 4 by a set screw t.

will be apparent that if the set screw 12S d collar 26 shifted, the

eccentric 26 may be shifted on the main shaft so as to change the timing of the retainer relative to the looper.

Having thus particularly described my invention, what I claim as new and desire to Secure by Letters Patent is 1. The combination with a needle, a looper and means for operating the same, of a loop retainer and means for moving said loop retainer forward and back in unison with the looper, and devices for giving thereto a movement across the upper face of said looper at a distance back of the point thereof for engaging the needle loop and holding the same back on the looper.

2. The combination with a needle, a looper, a looper carrier and means for operating the same, of a retainer mounted on said looper carrier to move therewith and means for oscillating said loop retainer across the upper face of said looper at a distance back of the point thereof.

3. The combination with a needle, a looper, a looper carrier and means for operating the same, of a loop retainer pivoted to said looper carrier and means for oscillating said loop retainer across the face of said looper at a distance back of the point thereof.

4. The combination with a needle, a looper, a looper carrier and means for operating the same, of a loop retainer pivoted between spaced lugs,-form ed on said looper carrier and means for oscillating said loop retainer.

5. The combination with a. needle, a looper, a looper carrier and means for operating the same, of a loop retainer oscillating back'and forth with said looper carrier and means for oscillating said loop retainer, the connection between the loop retainer and its operating means being substantially in line with the pivotal support ofithe looper 'carrier.

6. The combination with a needle, a looper, a looper carrier and means for operating the same, of a loop retainer pivoted to said looper carrier and having a downward extension, an eccentric and devices between said eccentric and said downward extension for oscillating said loop retainer.

7. The combination with a needle, a looper, a looper carrier and means for operating the same, of a loop retainer pivoted to said looper carrier and having a downwardextension, an eccentric, and devices between said eccentric and said downward extension for oscillating said loop retainer, said devices including means for giving to said loop retainer a differential movement.

8. The combination with a needle, a looper, a looper carrier and means for operating the same, of aretamer mountedon the looper carrier, and means for moving said loop retainer quickly forward and back across the upper face of the looper at a distance back of the point thereof for engaging themeedle loop and holding the same well back on the looper and giving thereto an ex tended dwell in its retracted position.

9. The combination with a needle, a looper and means for operating the same, of a loop retainer moving back and forth in unison with said looper and means for moving said loop retainer across the upper face of the looper, said means comprising devices for giving said loop retainer a forward and backward movement. across said looper with a dwell in its retracted position said rctainer crossing the looper at a distance back of the point thereof for engaging the needle loop, and holding the same well back on the looper.

10. Thecombination with a needle, of a looper, a looper carrier and means for oscillating the same, a loop retainer pivoted on said looper carrier, a rock lever, an eccentric for operating said rock lever and a link connecting one end of said rock lever to the loop retainer, whereby said loop retainer is given a quick-forward and back movement with a dwell in its retracted position.

11. The combination with a needle, alooper, a looper carrier, means for operating the same, of a retainer, means for moving said retainer forward and back with the looper, means for moving said looper retainer quickly forward and back across the upper face of the looper and giving thereto a dwell in its forward position, whereby the needle loop is held back on said looper until the needle is well down into the triangle formed by the needle loop, the looper thread and the side of the looper.

12. The combination of a needle, a looper and means for operating the same, of a loop retainer means for moving said retainer forward and back with the looper and means for giving said loop retainer a variable speed whereby it is moved quickly forward and back and given a dwell in its forward position to hold the-needle loop back on the looper until the needle is well down into the triangle formed by the needle loop, the looper thread, and the side of the looper.

13. The combination with a needle, a looper and means for operating said looper, a loop retainer, means for moving said loop retainer forward and back in unison with the looper, said loop retainer being located above the looper, and means for moving said loop retainer in a direction at right angles to the path of movement of the looper and across the faceof saidloopewat a distance back of the point thereof.

14. The combination with a needle, a looper, a looper carrier, means for operating the looper carrier, .a retainer mounted on said looper carrier and partaking of the movements thereof, and, independent means for giving said retainer a movement in a plane at right angles to the path of travel,

of the looper carrier'on which it is mounted and across the face of the looper at a distance back of the point thereof,

15. The combination with a needle, a looper, a looper carrier, means for operating the same, of a retainer mounted on sai looper carrier to move therewith, means for giving said retainer a dilferential speed and throw of said retainer, and means for varying the time of movement of said retainer relative to said looper.

18. The combination with a needle, a

' looper, a looper carrier, means for operating the same, a loop retainer mounted on said -looper earner, an eccentnc for operating said retainer and means whereby the connection between said eccentric and said retainer may be adjusted, so as to vary the throw of said retainer. 7

19. The combination with a looper, a looper carrier, a loop retainer mounted on said 100 er carrier, said loop retainer having a slotte extension, a sliding block mounted in said slotted extension, means for securing said sliding block in adjusted positions, and an eccentric having a connection with said sliding block.

20. The combination with a looper, a looper carrier, a loop retainer mounted on said looper carrier, said loop retainer having a slotted extension, a sliding block mounted in said slotted extension, means for securing said sliding block in adjusted positions, and an eccentric having a connection with said sliding block, and means for adjusting the position of said eccentric on-its supporting shaft.

7 In testimony whereof I aflix my signature, in presence of two witnesses.

, LANSING ()NDERDONK. Witnesses:

R. S. OswALD, WALTER HARTLEY.

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