US1047887A - Thread-cutting attachment for sewing-machines. - Google Patents

Description

R. L. COLBY. THREAD CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLIOATIOIT IIL'ED JUNE 15. 1912.

Patented Dec. 17, 1912.

11047 887. ZSHEBTB-SEEET 1.

R. L. COLBY. A THREAD CUTTING ATTACHMENT FOR SEWING MAGHINES.

APPLICATION FILED JUNE 15, 1912.

' Patented Dec. 17, 1912.

' IVESSES Arron/157s 'UNITED STATES PATENT onmcn.

ROBERT LEE COLEY, OF KANNAPOLIS, NORTH CAROLINA, ASSIGNOB OF ONE-ml TO Y TAKES W. CANNON, OF CONCORD, NOB'IH CAROLINA,

THREAD-CUTTING ATTACHHEM FOB SEWTNG MA Specification of- Letters Patent I Patented Dec} Applieatlon flled June 15, 1912. Serial no, masts.

To all whom it may concern: 1 v Be it known that I, ROBERT LEE Comer, a

, citizen of the United States, and a resident second article being fed as the first is finof Karma olis, in the county of Cabarrus, State of orth Carolina, have invented a new and useful Improvement in Thread- Cutting Attachments for Sewing-Machines, of which the following is a specification.

My invention is an lmprovement in thread -cutting attachments for sewing machines, and has for its object the provision of a simple attachment of the character specified, capable of attachment to any form of machine with but little change, and for automatically cutting the thread between articles without stopping the machine'and without injuring the artlcle.

In the drawings: Figure 1 is a side view of a portion of a sewin machine provided with the attachment; Fig. 2 is a top plan view of the double feed plate; Fig. 3 is a section on the line 33 of Fig. 1; Fig. 4 is a" section on the line 44 of Fig. 3;:Fig. 5 is an enlarged detail end view of thepresser feet and the feed plates; Fig.6 is a perspective view of the presser feet; Fig. 7 1s a perspective view'of the supporting mechanism for the blade, and Fig. 8 is a section on the line 88 of Fig. 4.-

With power machines, as also with hand operated machines, the articles are passed through the machine in close succession, a

ished, so that there will be no stoppage of the machine and no cessation in the attention of the operator. After the articles are sewed they must be separated by clipping the connecting thread. i The present invention is designed to cut the thread between the articles automatically and as they are finished.

- The present embodiment of the invention is'shown in place on a sewing machine, and comprises a double foot, consisting of a socket 1, which is slipped over the end of the presser bar 2 of the machine in the usual manner and held in place by a set-screw 3.

e feeding mechanism of the machine, and another feed plate 6" extends from the shank in' the opposite direction from plate '6. The shank 7 has an openin ,9 for receiving a screw (not shown) to hold the plates in-place, and the double feed is operated in exactly, the same manner as the ordinary feed. ,The plate 6 cooperates with presser foot 5, while plate 6 cooperates with presser'foot 5". An arm 11'-is provided at its ends with bearings 12 and 12, the former engaging the needle bar 13 and the latter receiving one end of a rod 14. A set-screw 15 is passed through bearing12 and engages the needle bar to hold the arm in (P08111011,

and a head 16 is pinned to the lower end of. the rod, as indicated at 17. A spring 18 encircles the rod above the head for a p ose to be described, and the head has spaced ugs on its under face engaging opposite sides of a plate 19. A washer 20 encircles the rod -above"the bearing 12, and nuts 21 are threaded onto the rod above the washer.

The plate 19 is mounted to slide vertically on a holding plate 22, secured'tothe frame. 23 of the machine by a screw 24. The plate 19 has alined longitudinal slots 25, one near 'each end, and screws,26 are passed through I the slots and engage the plate 22. A plate spring 27 is arranged onthe opposite face of plate 1 9- from the plate 22, and the screws 26 pass through the sprin and hold it agalnst plate 19. The ends 0 the spring are curved outwardly, as shown at 28, to prevent cutting of plate 19. A blade 29 extends lat erally from'the upper end of plate 19, and a bar-30 is secured to the blade and plate by screws 31. The lugs of the head embrace both the bar and the upper end of plate 19 and the blade 29 moves vertically with the plate 19, the said plate slidin between plate 22 and spring 27. The movaile blade 006perates wlth a ledger or fixed blade 32 extending laterally from the upper 7 end of plate 22, and the said blades 29 and 32 extend transversely of the stitches it is formed by the needle. The bar 30 extends on the opposite side of the plate 19 from the blades,

and the opposite end from the blades is bent laterally downward, as shown at 33, and. provided with a button or circ'ularl late or head 34. A second button plate or ead 35 is arranged below the table 36 in register I j the arm in adjusted position on the bar, a rod in the other bearing, a nut on the rod a plate spring 37 by means of a screw 38,

and the opposite end of the spring 37 is se- 1 cured to the under face of the table by screws 40. A disk 41 of rubber or the like is placed on the upper face of head 35 in the opening 39, the heads and disk forming a protecting device for the cloth.

The operation of the im rovement is as follows: The articles are ed throu h the vmachine-in succession, each article ollow-' ing the precedin closely, and the 'stitch or threads connect t e articles. The thread between the articles is held taut by the auxiliar feed plate and presser foot. The rod 14 is reciprocated continuously by the needle bar, and the movable blade moves toward the fixed blade at every downward movement of the needle bar. As long as an Jarticle is between the blades the movable blade 29 merely strikes on the upper face of the seam. The spring 18 yields and permits the blade 29 to be held upwardly by the cloth. As soon as the article passes from between the blades the blade 29 moves past the blade 32 and clips the threads. The heads or plates 34 and 35 act as protectors for the cloth; When the needle bar moves down, the head or plate 34 strikes the cushion, that is, the disk 41, and the spring 37 which yields and prevents injury to the cloth from the blades. When the cloth is plate and a needle bar, of a.thread cutting attachment, comprisin an auxiliary presser foot and an auxiliary eed plate coiiperatin therewith and arranged directly behind an in alinement with the presser foot and feed plate of the machine, a plate arranged vertically between the auxiliary presser foot and the presser foot of the machine and rovided with a laterally extending le ger blade extending transversely of the stitch below the same, a plate mounted for sliding movement on the first plate and provided with a laterally extending blade coiiperating with the ledger blade, an arm having a bearing at each end, one of the bearings engaging the needle bar, means for securing above the arm, a head at the lower end of the rod, said head being connected to the sliding plate, a spring encircling the rod between the arm and the head, a bar extending laterally from the sliding plate, a resilient arm secured at one end to the machine and having its free end below the The auxiliary feed free end of the bar, disks on the free ends of the arm and bar, and a cushion of rubber on the disk of thearm.

2. The combination with asewing machine provided with a presser foot, a feed plate of" the machine, a plate arranged vertically between the auxil ary presser foot and the presser foot of the machine and rovided with a laterally extending le ger blade extending transversely of the stitch below the same, a plate mounted for sliding movement on the first plate and provide with a laterall with the first blade, an arm having a bearing at each end,.one of the bearings engaging the needle bar, means for securing the arm in adjusted position on the bar, a rod in the other bearing, a nut on the rod above the arm, ahead at the lower end of the rod, said head being connected to the sliding plate, a spring encircling the rod between the arm and the head, and a cushion for engaging the'sliding plate as it nears the end of its downward movement.

3. The combination with a sewing machine provided with a presser foot, a feed plate and a needle bar, of a thread cutting attachment, comprising an auxiliary presser foot and an auxiliary feed plate cooperatin therewith and arranged directly behind an in alinement with the presser foot and feed plate of the machine, a plate arranged vertically between the auxiliary presser foot and the presser foot of the machine-and provided with a laterally extending ledger blade extending transversely of the stitch extending blade codperating below the same, a plate mounted for sliding movement on the first plate and provided with a laterally extending blade cooperating with the ledger blade, an arm having a bearing at each end, one of the bearings engaging the needle ban-means for securing the arm in adjusted position on the bar, a rod in the other bearing, a nut on the rod above the arm, a head at the lower end ofthe rod, said head being connected to the sliding plate, a spring encirclingthe rod between the arm and the head, and means for cushioning the downward'movement of the sliding plate. 1 I

4. The combination with a sewing machine provided with a presser. foot, a feed plate and a needle bar, of a thread cutting attachment, comprising an auxiliary presser foot and an auxiliary feed plate cooperating therewith and arranged directly behind and in alinement with the presser foot and feed plate of the machine, a plate arranged vertically between the auxiliary .presser foot and the presser foot of the machine and pro- 5. The combination with a sewing ma- :hine provided with a presser foot, a feed plate and a needle bar, of a thread cutting lttachment comprising an auxiliary presser foot and an auxiliary 'feed plate'cooperating herewith and arranged directly behind and .n alinement with-the presser foot and feed slate of the machine, a plate arranged veriically between the auxiliary presser foot' and the presser foot of themachine .and provided with a' laterally extending ledger blade extending transversely of the stitch at the level of the table of the machine, a plate mounted for sliding movement on the first plate and provided with a laterally extending blade coiiperating with the ledger blade, and a yielding connection between the sliding plate and the needle bar for reciprocating the plate with the bar.

6. The combination with the sewing machine provided with a presser foot, a feed plate, a needle bar, and a needle, of a fixed blade extending transversely of the needle behind the same, a. movable blade cooperating with the fixed blade for severing the thread behind the needle, an arm. having means for adjustably engaging the needle bar, a rod connected at its lower end to the movable blade and slidably connected at-its opposite end to the arm, a spring between the blade and the arm, means for cushioning the downward movement of the blade, said means comprising a laterally extending bar connected to the rod, a resilient arm connected at one end to the machine and having its free end in position for engagement by the arm as the blade moves downwardly, a cushion between the arm and the bar, and an auxiliary feeding device for the articles in rear of the needle.

7. The combination with the sewing machine provided with a presser foot, a feed plate, a needle bar, and a needle, of afixed blade extending transversely of the needle behind the same, a movable blade'cotiperating with the fixed blade for severing the thread behind the needle, an arm having means for. adjustably engaging the needle bar, a rod connected at its lowerend to the movable blade and slidably connected at its opposite end to the arm, a spring between the blade and the arm, means "for cushionin the downward movement of the blade, sai

means comprising a .laterally extending bar ,connected to the rod, a resilient arm connected at one end to the machine and having its free end in position for engagement by the arm as the blade moves downwardly, and an auxiliary feeding device for the articles in rear of the needle.

8. The combination with the sewing machine provided with a presser foot, a feed plate, a needle bar, and a needle, oia fixed blade extending transversely of the needle behind the same, a .movable bladecooperating with the fixed blade for severing the thread behind the needle, an arm having means for adjustably engaging the needle bar, a rod connected at its lower end to the movable blade and slidably connected at its opposite end to the arm, a spring between the blade and the arm, means for cushioning the downward movement of the blade, and an auxiliary feeding device for the articles in rear of the needle.

9." 'The combination with the sewing machine provided with a presser foot, a feed plate, a needle bar, and a needle, of a fixed blade extending transversely of the needle behind the same, a movable blade cooperating with the fixed blade for severing the thread behind the needle, a yielding connection between the movable blade and the needle barfor reciprocating the blade with. the bar, means'for cushioning the downward movement of the blade, said means comprising a laterally extending bar com nected'to the rod, a resilient arm connected at one end to the machine and having its free end in position for engagement by the arm as the blade moves downwardly, a cushion between the arm and the bar, and an auxiliary feeding device for the articles in rear of .the needle.

10. The combination with the sewing ma-.

chine provided with a presser foot, a feed plate, 'a needle bar, and a needle, of a fixed blade extending transversely of the needle behind the same, a movable blade cotiperating with the fixed blade for severing the thread behind the needle, a yielding connection between the movable blade and the needle .bar for reciprocating the blade with the bar, and an auxiliary feeding device in rear of the needle.

ROBERT LEE COLEY. Witnesses: v

E. C. ANDREWS, O. E. ScARBoRo.

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