US1198781A - Chain-severing device. - Google Patents

Description

D. s. SEYMOUR.

CHAIN sevn'um; DEVICE.

APPLICATION FILED SEPT-24,1914.

1,198,781. PitentedSept. 19,1916.

3 SHEETS-SHEET l.

D. S. SEYMOUR.

CHAIN SEVERING DEVICE.

APPLICATION FILED SEPT-24. 1914.

1,198,781. PatentedSept.19,191 6.

3 SHEETS-SHEET 2.

D. S. SEYMOUR.

CHAIN SEVERING DE/VICE.

APPLICATION FILED sPT.24. 191+.

Patented Sept. 19, 1916.

3 u uemtoz 3 SHEETS-SHEET 3.

QXRMMOM (ltfomua S UNITED STATES PATENT OFFICE.

DUDLEY S. SEYMOUR, OF OAK PARK, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Sept. 19, 1916.

Continuation of application Serial No. 294,255, filed January 2, 1906. This application filed September 24,

1914. Serial N 0. 863,328.

To all whom it may concern Be it known that I, DUDLEY S. SEYMOUR, a citizen of the United States, residing at Oak Park, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Chain-severing De 'vices, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to sewing machines of the general class-employed for sewing bags, containersand other articles wherein 'the stitching operation progresses continuously'forming a connecting chainof loops between a finished article and an article being stitched, which chain is cut or severed for separating the finished article.

An objectof the invention is to provide mechanism for automatically severing the connecting chain of loops between the articles after the completion of the stitching without rendering it necessary to stop the machine.

A further object of the invention is to provide a continuously operating cutting device for sewing the connecting threads or chain of stitches between stitched articles, which cutting device is simple in construction and positive in its operation.

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

In the drawings: Figure 1 is a front elevation of a sewing machine embodying my invention, certain parts being broken-away to show the cutter actuating mechanism. Fig. 2 is a perspective view from the rear of the machine showing a portion of the feeding mechanism, the cutting mechanism, and the relation of the same to the feed dog. Fig. 3 is a plan view of the work support, a part thereof being broken away ,to show part of the cutting mechanism. Fig. 4 is a plan view showing the feed dog and the cutting mechanism. Fig. 5 is a longitudinal sectional View on the line of stitching showing thework support, presser foot, feed dog, and cutting members. Fig. 6 is a view simi lar to Fig. 5 taken at the side of the feed dog. Fig.7 is a detail from the rear of the path of travel of the material through the.

machine. These cutter blades are so disposed that the line of cutting is in a vertical plane containing the needle. The work sup port is provided with a slot directly in rear of the needle and over this slot is located the presser foot. The material being fed through the machine bridges the slot and the outside members of the feed dog extend alongside of the slot so as to carry the material completely from beneath the presser foot. It is well known that a chain of stitches may be formed between stitched articles. This chain of stitches is fed along by a section of the feed dog which is in line with the needle. This feed dog terminates well underneath the presser foot so that the chain of stitches will be deflected or bent through the slot in the 'Work support into the-path of the cutters which are located beneath the Work support. Thus, the chain of stitches or connecting loops between a finished article and an article beingstitched "I have shown my invention as applied to a sewing machine having a bed plate 1 carrying a work support 2, and an overhanging arm 3 in which reciprocates a needle bar 4 carrying a needle 5. The needle bar is reciprocated by a needle lever 6 which is oscillated from the main operating shaft C. Cooperating with the needle beneath the work support is suitable complemental stitch forming mechanism also operatedfromsaid shaft.

Mounted beneath the Work support is a feed dog 7 which is carried by a feed'bar'8 which is moved back and forth by a feed rocker 9. This feed bar is raised and lowered in the .well known way. The work support 2'is provided with a throat. plate 10' needle 5 and three feed slots 12, 13 and 1 1. The feed dog 7 is-provided with a long feeding section 15 which works in the slot 12 and extends from a point slightly in advance of the needle opening 11 to a point adjacent the rear edge of the throat plate. The feed dog is also provided with a feeding section 16 which works in the slot 1 1. The

feed dog also has a thread feeding section 17 which works in the slot 13 at the forward end thereof only leaving a greater portion of the slot 13 free and unobstructed. Cooperating with the feed dog is a presser foot 18 which has a forward section 19 with an upturned toe-located in front of the needle 5 and a section 20 which extends rearwardly substantially'to the rear end of the throat plate 10: This presser fo'ot, therefore, covers the slot 13 in rear of the section 17 of' the feed dog.

Located beneath the work support is a cutting mechanism which consists of a fixed or stationary cuttingblade 21 and a movable cutting blade'22. Mounted on one of the supporting brackets for the bed plate is a block23. The fixed cutting blade 21 is adjustably clamped on this block 23 by a set screw 21, see Fig. 6. The fixed cutting blade at its lower edge is formed with a projection 25 which overlaps the movable cutting blade 22. That is to say, the movable cutting blade 22 makes contact continuously with the fixed cutting blade or the projection 25. The movable cutting blade is mounted in anarm 26 carried by a rock shaft 27 having a second arm 28 which is connected to an eccentric strap or connecting rod 29 coiiperating with an eccentric 30 on the main shaft C, see Figs. 1, 2 and 3.

The arm 26 is slotted at its upper end to receive the cutter 22 and a set screw 32 is adapted to engageand clamp the cutting blade. An adjustable bolt 33 is carried by the arm 26 and the head of this bolt rests against the rear end of the cutting blade 22 and forms an adjustable seat for this blade. As the main shaft C rotates, the rock shaft 27 will be oscillated and this in turn will oscillate the movable cutting blade 22. The rock shaft 27 is mounted in suitable bearings 34 and 35 carried by the bed plate 1.

In Fig. 7 of the drawing, I have shown a slightly modified form of cutting means. The fixedcutting blade 21 is adjustably secured in a block 36 by a set screw 37. This fixed cutting blade 21 is provided with a projection 25. Cooperating with the fixed cutting blade'is a movable'cutter blade 22 which is clampedin an arm 38 by a set screw 39. The arm 38 is carried by a rock shaft 40 which is. mounted in a bearing 41 carried by the bed plate 1 of the machine. At the other end of the shaft 40 there is a sleeve 42 carrying an arm 43 which cooperates with an eccentric strap 44:, and the eccentric strap in turn cooperates with an eccentric 45 on the main shaft C. The cutting blades are located so that the cutting edge of the fixed blade is directly beneath the slot 13 in the throat plate and, therefore, the cutting line of the blades is in a vertical plane containing the needle. blades are also located in a vertical plane at right angles to the line of feed and are disposed underneath the rearwardly extending parts of the feed dog. Vhen an article is being stitched, the article bridges the slot 13 and the sections 15 and 16 of the feed dog will feed the article until it passes from underneath the rear section 20 of the presser foot. As soon as the article leaves the needle, a chain of loops is formed by the needle and the complementa-l stitch forming mechanism, and this chain of loops is fed away from the needle by the small section 17 of the feed dog directly in rear of the needle. As soon as the article being stitched leaves the presser foot, it stops. The formation and feed of the connected chain of loops continues. Inasmuch as the presser foot closes the slot 13. at the upper face thereof, this chain of loops is necessarily deflected downward through the slot 13 by the presser foot and caused to sag or bend, so as to drop into the path of the movable cutter 22. The

projection 25 serves as a rest for the connected chain of loops and prevents the same fronidropping through between the cutters when they are separated. Furthermore, by reason of the movable cutter having constant engagement with the projection 25, the chain of loops is retained upon said projection, so that upon the closing of the cutters the chain vill be severed. It will, therefore, be seen that the feed of the machine without any attention on the part of the operator, will automatically place the connecting chain of stitches or loops between the stitched article and the article being stitched in the path of the continuously moving cutter blade, so that said chain will be automatically severed and the articles separated.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent is:

1. A sewing machine including in combination, stitch forming mechanism, a throat plate having slots for the passage of the sections of a feed dog, feeding mechanism including a feed dog having feeding sections,

one of which is intermediate the other two.

The cutting -slot in rear of the needle opening for the passage of the chain of stitches, a cutting mechanism below the slot including a stationary cutting member, a movable cutting member, said cutting members being located in a plane at right angles to the work support and crossing said slot, and means for operating the movable cutter.

3. A sewing machine including in combination, a stitch forming mechanism, a work support formed with an opening in rear of and in line with said stitch forming mechanism, a chain cutting device located below the opening of the work support, a feeding mechanism, a presser foot located above the feeding mechanism and covering said opening for, downwardly directing the chain of stitches to said chain cutting device.

4. A sewing machine including in combination a stitch forming'mechanism, a work support extending in front of and in rear of said stitch forming mechanism, and formed with an opening in rear of and in line with said stitch forming mechanism, a chain cutting device located below the opening of the work support, a feeding mechanism, and a presser foot-located above the feeding mechanism and covering said opening for downwardly directing the chain of stitches to said chain cutting device.

5. A sewing machine including in combination a stitch forming mechanism including a needle, a work support having an opening in rear of the needle, and a feed slot at one side of said opening, a feed dog havinga feeding section in the slot at the side of said opening extending substantially to the rear of said opening, and a short feeding section in said opening at the forward end thereof only, a presser foot extending to the rear of said opening and covering the same, cutting devices located beneath the work support and beneath the section of the feed dog extending to the rear end of the opening, and means for continu-' ously actuating said cutting devices, said cutting devices being disposed so as to operate in a plane at right angles to the line of feed.

6.- A sewing machine including in combination a stitch forming mechanism including a needle, a work support formed with an opening in rear of the needle, a feed dog having a thread feeding section operating in the front end of said opening only, a presser foot cooperating with said feeddog and covering said opening, cutting devices located beneath the work support and including cooperating cutting blades, one of which is provided with a projection at its lower edge adapted to continuously overlap the other section, said blades being disposed so as to operate in a plane at right angles to the line of feed.

7. A sewing machine including in combination, a stitch-forming mechanism, a Work support formed with an opening in rear of and in line with said stitch-forming mechanism, a chain-cutting device located below the opening of the work support, a feeding mechanism, a presser foot located above the feeding mechanism and covering said opening fordownwardly directing the chain of stitches to said chain-cutting device, and means for operating said cutting device.

In testimony whereof I afiix my signature in the presence of two witnesses.

DUDLEY S. SEYMOUR. lVitnesses:

S. GEORGE TATE,

HAROLD O. EDWARDS.

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