US412188A - Half to g herbert porter - Google Patents

Description

No-Model.

A. E. JOHNfiON.

GROOVE GUT-TING ATTAGHMENI FOR SEWING MACHINES.

No. 412,188. PatentedOc'g. 1, 1889.

. d oi'ma 07 UNITED STATES PATENT OrFrcE.

i ALBERT E. JOHNSON, OF BROCKTON, MASSAOHUSET'B, ASSIGNGR OF ONE- HALF TO U; HERBERT PORTER, OF SAME PLACE.

GROOVE-CUTTING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION formingpart of Letters Patent No. 412,188, dated October 1,1889. Application filed July 8, 1889. Serial No. 316,767; (No model.)

To aZZ whom, it may concern:

Be it known that I, ALBERT E. J ornvson, of Erockton, county of Plymouth, State of Massachusetts, have invented an Improvement in Grooving Attachments for Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

Sewing-machines designed for what is commonly called fair stitching employ groovingtools for forming a groove to receive the chain or loop of the stitch.

This invention has for its object to simplify and improve this class of machines as to the grooving mechanism; and the invention consists in the combination, with the rocker-arm, needle-bar, and needle, of a grooving-tool and a lever on which it is mounted, and means, substantially as described, to vibrate the said lever as the needle-bar rises. The lever to which the grooving-tool is'attached is herein represented as pivoted to the rocker-arm and as having a cam or irregularsurfaced edge which is acted upon by a stud carried by the needle-bar. The lever and plate attached to it to which the groovingtool is attached are preferably joined together adj ustably.

Figure 1 shows an end view of a sewing-machine'provided with a grooving-tool embody' in g this invention. Fig. 2 is a vertical sectional detail of the rocker-arm and grooving-tool, showing means for moving said tool.

I have provided the sewing-machine with a lever i mounted on a suitable pivot or fulcrum -11 of the rocker-arm c, and, as shown, I have connected to this lever by screws 3 a plate a" the said screws passing through slots in the said plate, so as to provide for adjust ment, and to the upper end of the said plate '11 therein shown as offset) I have connected in an adjustable manner the grooving-tool i, the connection being by a screw, as 2, to provide for adjustment. The grooving-tool may be of any usual shape.

The cam-shaped edge 73* of the lever 17* below its pivot 21 is kept by the spring 5 normally in the path of movement of a stud 4, carried by or attached to the needle-bar cl,

so that as the needle-bar rises the said stud, by acting on the edge of the lever i which it does just aft-er the needle penetrates the work, vibrates the said lever while the needle is yet in the work, thereby causing the grooving-tool i to be moved for a short distance in a direction to cut a groove in advance of the stitching. As the stud -11: rises it passes by the cam 2' and enters a recess above it, thereby permitting the grooving-tool i to retreat a short distance, but shorter than this forward movement, and as the stud iresumes its normal position or descends it passes over the cam i and moves the grooving-tool forward again a short distance and retreats to its normal position.

Thus it will be seen that while the needle is in the work, and previous to feeding, the grooving-tool operates to cut the groove for the loop. Vertical adjustment of the grooving'tool is effected by moving it and the plate a" as a whole vertically on the pivoted lever i and lateral adjustment of the tool is effeoted by moving the same in the offset portion of the plate 11 by means of the screw 2 and the slot, as will be plainly seen in Fig. 2.

I claim- 1. The combination, with the stitch-forming mechanism of a sewing-1nachine,co1nprising the awl, needle and cast-off, and the needle-bar and rocker-arm in which it slides, of a laterally and vertically adjustable grooving-tool and an independent carrying-lever loosely connected to the rocker-arm, substantially as described.

2. The combination, with the stitch-form- 'ing mechanism of a sewing-machine, comprising the awl, needle and cast-off, the needle-bar, and rocker-arm in which it slides, of an adjustable grooving-tool and an independent lever pivotally connected to the said rocker-arm and provided with a camedge, and means, substantially as described, for acting upon said cam-edge and moving the said lever onits pivot while the needle is entering and leaving the work, substantially as described. I

3. The combination, with the stitch-forming mechanism of a sewing-machine, comprising the awl, needle and castofi, the

needle-bar, and rocker-arm, of the groovingtool and pivoted lever i said grooving-tool being vertically adjustable with the tool-carrier, substantially as described.

4. The combination, With the stitch-forming mechanism of a sewing-machine, comprising the awl, needle and cast-off, the needle-bar, and rocker-arm, of the groovingtool and pivoted lever 2' said grooving-tool being laterally adjustable on the tool-carrier, to substantially as described. 7

In testimony whereof I have signed my name to this specification in presence of two subscribing Witnesses.

I ALBERT E. JOHNSON. \Vitness'es:

LUCIUS LEAOH, C. HERBERT PORTER.

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