US1098011A - Sewing-machine. - Google Patents

Description

H. BRIGGS.

SEWING MACHINE.

APPLICATION FILED 30V. 24, 1906.

Patented May 26, 1914.

2 SHEETS-SHEET 1.

a w s W H. BRIGGS.

SEWING MACHINE.

APPLICATION FILED NOV. 24, 1906.

Patented May 26, 1914.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

HENRY BRIGGS, OF HASBROUGK HEIGHTS, NEW JERSEY.

SEWING-MACHINE.

To all whom it may concern:

Be it known that I, HENRY Bmccs, a eiti-' zen of the United States,'residing at. Hasbrouck Heights, in the county of Bergen and State of New Jersey,-have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to slide locking devices for sewing machines and more particularly to devices for locking the back gage and back rest slides of inseam shoe-sewing machines.

In inseam shoe-sewing machines it is common to providedevices for guiding and supporting the lasted shoe during the operation of the sewing instrumentalities, such devloes being known as back gages or back rests according to their location and point of engagement with the shoe. Such devices are usually made to be movable either by the pressure of the work thereagainst or through the mechanism of the sewing machine, at certain times in the operation of the machine, so as to permit the position of the work to be changed as it is fed, while during the formation and setting of the stitch these devices are locked in position, to prevent shifting, at such time, of the work. To look the back rest and back gage slides in position pawl and ratchet mechanisms have heretofore usually been employed; These mechanisms have not however been entirely satisfactory since they do not always look the slides in exactly the desired position on account of lost motion between the teeth of the ratchets and the L locking pawls. Furthermore these mechanisms are not durable and give trouble on.

account of the breaking of the pawls or the .teeth of the ratchets.

The object of the present Invention is to provide a simple and improved means for looking the back rest and back gage slides of With this object in view the presentinventionconsists in the devicesand combma- Specification of Letters Patent. Patented May 26, 1914, Application filed November24, 1906. Serial No. 344,828.

tions of devices hereinafter described, as defined 1n the claims,

In the drawings F lgure 1 is a side elevathe preferred form of the present invention, Fig. 2. is a detail view, in side elevation, of the back gage and back rest slides together with their locking mechanism, and Fig. 3 is a rear end elevation of the parts illustrated in Fig. 2.

Theinvention is illustrated as embodied in a chain-stitch inseam-sewing machine of the type shown and described in Letters Patent of the United States No. 687,719, granted December 3,1901, to thisapplicant. The back gage of the machine is indicated at 1 and the back rest at 2. The back gage longitudinally in ways formed in the frame of the machine, and a cam lever 4 is provided for moving the back gage backwardly as is usual in this class of machines. The back gage is returned to a forward position by the usual spring 5.

The locking mechanism for the back gage slide comprises a fixed locking member 6 provided with a friction surface parallel with the length of the slide 3, and a movable locking member 7 pivoted at one end, by means of a screw 8, to the slide 3 and provided with a friction surface 9 parallel with the length of the slide. Below the slide is chine, an oscillating roll-supporting member 11' provided with a hardened face 12 which is slightly inclined to the lower friction surface of the locking member 7. Between the roll-supporting member 11 and the locking member 7 is interposed a clutch roll 13 which may be in the form of a hardened steel ball or cylinder.- 1

The backrest 2 is mounted upon a slide 14 provided with a pivoted locking member 15,- and the latter is engaged by a fixed controlled by a roll supporting member 18, all substantially like the corresponding devices connected with the back gage, except that the parts are inverted. The slide 14 is drawn forward by a spring ,lfLfixed. at its rear end to an arm 20 projecting from the slide and at its forward end to the frame of the machine. The roll-supporting member 11 is provided with an arm 21 arranged to tion of a shoe-sewing machine embodying locking member 16 and a clutch roll 17,'

1 is mounted upon a slide 3 which moves 1 pivoted at 10, upon the frame of the mabe engaged by an adjusting screw 22 on an,

arm 23 on the roll-supporting member 18-, and the latter is provided with a second arm 24 arranged to be engaged by a lever 25 pivoted at 26 on the'frame of the machine. The lever 25 extends into the path of movement of a cam lever 27 actuated by a cam 28 on the cam shaft 29 of the sewing machine. The cam path is not shown in the drawing since its form will be obvious to those skilled in the art and can be readily produced by any designer of shoe sewing machines.

The train of mechanism just described operates to oscillate the roll supporting members 11 and 18 at suitable times to unlock the slides 3 and 14, the member 18 being oscillated directly by the lever 25 when the lower end of the lever 27 moves to the right and the member 11 being oscillated by the enagement of the screw'22 with the arm 21. %y means of the adjusting screw 22 the movements of the members 18 and 11 can be tively with projections 30 and 31 at the rear of the rolls. The roll supporting members are returned-to locking position by means of a coiled spring 32 connecting the members, and to insure the return movement of the rolls the roll supporting members are provided with projections 33 and 34 at the front of. the rolls. When the roll supporting mem-' bers are in locking position as indicated in Fig. 2 any backward pressure exerted upon the slide 14 is resisted by the roll 17 pinching between the locking member 15 and the" supporting surface of the member 18 and thereby, by the wedging action of the roll and the toggle action of the member 18, pressing the member 15 firmly against the fixed locking member 16. A backward pressure exerted upon the slide 3 is resisted in a similar manner by the action of the roll 13, its supporting member 11 and the movable and fixed locking members 7 and 6. The slides are not, however, locked against forward movement but are free tomove forward under the force of the springs connected therewith as soon as the slides are relieved of backward pressure. The locking devices lock the slides accurately in the positions to which they are movedwhile un- \locked without any lost motion and without any tendency to force the slides tforward. The greater the backward pressure exerted upon the slides the more firmly will the movable locking members be forced against the ing and unlocking the slides. The plate 35 (see Fig. 3) covers the locking devices to prevent the esca e of the rolls. This plate- 18 not shown in ig. 2.

The construction illustrated in the drawings and above specifically described embodies the features of the present-invention in the best form that has yet been devised. It is to be understood, however, that the invention is not limited, to the details of construction of the illustrated embodiment but may be embodied in other forms within the scope of the claims.

The invention having been described what is claimed is 1. An inseam shoe sewing machine having, in combination, a work-rest slide, a fixed friction-lockin member, a movable locking member pivota ly connected to the slide, and

mechanism for intermittently pressing the locking members together to lock the slide, substantially as described.

2. An inseam shoe sewing machine having, in combination, a work rest slide movable toward and from the shoe provided with a longitudinal friction-surface, a locking mechanism to lock the slide against backward movement comprising a pivotally-mounted roll-supporting member provided with a roll-supporting surface adjacent to said friction surface, a clutch roll located between and in engagement with said surfaces and mechanism for intermittently swinging the roll-supporting member about its pivotal support to release the roll and the slide, substantially as described.

3. An inseam shoe sewing machine having, in combination, a back-gage slide and a back rest slide provided with longitudinal frictionsurfaces, pivotally-mounted members rovided with roll supporting surfaces, clutc rolls interposed between said members and said surfaces, a spring connecting said members and tending to throw them into 0 erative position, arms connected to said members and engaging each other for causing the simultaneous actuation of said members, and mechanism connected with one member and operating intermittently to throw the members into inoperative position, substantially as described. 7

4. An inseam shoe sewing machine, having, in combination, a work rest slide, a fixed friction locking member, a cooperating friction locking member movably mounted on the slide, a clutch roll arranged to force the locking member against the fixed member, a support for said roll, and means for actuating said support to lock and unlock the slide, substantially as described.

, 5. An inseam shoe sewing machine, hav- 7 ing, in combination, a work rest slide movable toward and from the shoe provided with a longitudinal friction surface, a clutch roll engaging said surface to lock the slide against backward movement, a member engaging the roll provided with a roll supporting surface inclined to said friction surface and with a rojection at the rear of the roll, and means or actuating said member to re- 1 15 lease the slide, substantially as described.

' In testimon vwhereof I aflix my signature, in presence 0 two witnesses.

1 v HENRY BRIGGS. Witnesses:

FRED O. FISH, ALFRED H.

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