US1478379A - Attachment for hemstitching machines - Google Patents

Description

Dec. 25, 19253. 1,4783% Y F. BURGERT ET AL. .7

ATTACHMENT FOR HEMSTITCHING MACHINES Filed July 12. 1921 WITNESSES F m/mvron v U? 65:97 M fl. 50/9059? ATTORNEYS Patented Dec, 25, HQ.

UNITED TTE aerate TNT @FFEQ. K

FRIED BUT AND HENRY BURGERT, OF NEW YORK, N. Y.

ATTAENT F03; HEMSTITCHING- MACHHIES.

Application filed July 12, 1921. Serial No. 484,112.

To all whom it may concern:

Be it known that we, FRED BURGERT and HENRY Bunenn'r, citizens of the United States, and residents of the city of New York, borough of Manhattan, in the county of New York and State of New York, have invented a new and Improved Attachment for Hemstitching Machines,'of which the following is a full, clear, and exact descriplo tion.

Ihis invention relates to improvements in attachments for hemstitching machines, particularly to an attachment which may be used for forming picot edges.

An object of the invention is to provide a device of this character, which may be quickly applied to a conventional form of hemstitching machine without in any way interfering with the hemstitching operation 5 and with a very slight alteration to the machine.

A further object is to provide an attachment of the character stated, which will be durable and eflicient in use, simple and praccc tical in construction, comparatively inexpensive to manufacture, and which may be applied with facility to an ordinary machine.

With these and other objects in view, the

W invention consists in certam novel features of construction and combinations and arrangements of parts as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a fragmentary end view of a hemstitching machine illustrating our improved attachment in applied position;

Figure 2 is a view in elevation of the lower end of the piercer bar with our improved attachment applied thereto;

Figure 3 is a plan view of a iece\of material which is partially hemstitched illustrating the manner of use of the attachment; and

Fi re 4. is a plan view of .a piece of goods showmg the finished picot edge.

Referring in detail to the drawings, 1 represents a conventional type of hemstitching machine which is provided with the p usual reciprocating bar 2 carrying at its lower end an auxiliary piercer 3 and a pair of needles such as 4. The auxiliary piercer and the needles are movable through the presser foot 5.

6 represents a conventional form of feed dog, the upper notched face of which, is movable through a throat plate 7 A reciprocating piercer holder 8 mounted upon a piercer bar 8' carries a piercer 9 located between the needles 4 and adapted to spread the stitches made by the needles. The invention in this particular case resides in the provision of an improved attachment carried by the piercer bar for severing the threads after the hemstitching operation has been performed. The purpose of the arrangement is to effect a vertically reciprocating movement of the cutter with the movement of the piercer bar and in a path transecting the horizontal plane of the presser foot for the effective severing of the threads of the hemstitching after spreading by the piercer. It will be noted that the piercer holder at its lower end includes a 75 laterally presented arm 10. A knife 11 is integral at its upper end with a laterally presented arm 12. The arm 10 is slotted, as indicated at 13 and a set screw 14 passed through the slot serves to adjustably clamp the arm 12 and the arm 10 for simultaneous movement, The cutting edge of the knife 11 is presented toward the piercer 9, as seen in Figure 1.

In order to provide clearance for the downward thrust of the knife 11, it is necessary to provide a slot 15 in the central web of thethroat plate. The feed dog 6 is also slotted, as indicated at 16, down one side and through a portion of its base to provide 9Q clearance or the knife.

In operation, the auxiliary piercer 3 upon the descent of the arm 2 punches a hole such as 17 in a piece of fabric, designated by the reference numeral 18. As this perforation is fed under the needles,its edges are stitched as indicated at 19 and the threads are ushed apart by the piercer 9 so that the iiilished hemstitching includes a series of perforations stitched at their edges and a series of cross threads such as 20 between the perforations. It isthe function of the knife 11 upon its descent to out these threads as seen in Figure 3 and simultaneously form two icot edges such as 21 in Figure 4. We have illustrated and described an attachment as applied to one conventional type of hemstitching machine. We have also described the slight modification which must be made in the machine to receive the no attachment. It will be apparent, however, that an attachment operating on the same principle may be applied to various other hemstitching machines on the .market and we do not wish to limit ourselves to the pre cise details set forth, but shall consider ourselves at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of the appended claims.

7 We claim:

1. The combination with a hemstitching machine, including. a reciprocating piercer bar, a laterally presented arm integral with the lower end of the piercer bar, and a presser foot, of a knife movable through the presser foot, and a-laterally extending arm navae'ze at the upper end of the knife adjustahly coupled to the first mentioned arm.

2. The combination with a hemstitching machine including a reciprocating piercer bar, a laterally presented arm integral with the lower end of the piercer bar, and a presser foot, of a knife movable through the presser foot, :1 laterally extendin arm at the upper end of the knife, said rst men- A -tioned arm having a slot therein, a set screw extending through the slot and engageahle in the last mentioned arm to rigidly and ad'- justably couple the knife and bar.

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