US1575110A - Sewing machine - Google Patents

Description

Immh 2,1926.

A. B. FOWLER SEWING MACHINE v Original Filed May 21. 1919 2 Sheets-Sheet 1 wk. mwN

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March 2 1926.

A. B. FowLl-:R

SEWING MACHINE 2 Sheets-Sheet 2` Original Filed May 21, 1919 Patented Mar. 2, 1926.

ALFRED B. FOWLER, OF BEVERLY, MASS PATENT OFFICE.

ACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SEWING MACHINE.

Original application filed May 21, 1919, Serial No. 288,589. Divided and this application filed September 25, 1920, Serial N0. 412,653.

T0 all whom t 'may concern.'

Be it known that I, ALFRED B. Fownnu, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, 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 sewing machines and more particularly to mechanisms for actuating the back gage of an inseam shoe sewing machine.

The principal object of the invention is to provide a back gage actuating mechanism for inseam shoe sewing machines of novel and improved construction and mode of operation. To this end, the features of the invention consist in certain constructions, arrangements andy combinations of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art.

The several features of the invention will be clearly understood from the following description and acco-mpanying drawings in which Fig. 1 is a sectional elevation looking from the right and taken on a pla-ne just to the right of the needle segment of an inseam shoe sewing machine embodying the features in their preferred form, and Fig 2 is a detail sectional elevation of the back gage and back rest locking mechanism.

The inse-am shoe sewing machine illustrated in the drawings may be and preferably is the same as the machinev` illustrated and described in applicants co-pending application Serial No. 298,589, filed May 21, 1919, of which the present applicati-on constitutes a division. This machine, as illustrated, is provided with a curved; hook needle 2, a needle guide 4, a thread finger 6, a looper 8, a back gage 10, a back rest or bunter 12, and a vertical rod 14 which at a predetermined point in the final cycle of operations of the machine is moved upwardly, and which upon throwing the machine into operation is depressed.

The needle is secured in the usual manner to a needle segment 16 which is pivotal- Renewed August 27, 1925.

ly mounted on a shaft 18 and is actuated by a link 2O having one end pivotally connected at 22 with the needle segment auf its other end pivotally connected with a cam actuated lever 24.

The back rest or bunter 12 comprises a roll mounted on a forwardly spring pressed slide 26. The back gage 10 is connected as hereinafter described to a locking slide 28. The slides 26 and 28 are provided with means for locking them together, which means may be and preferably is the same as disclosed in applicants co-pending application, Serial No. 254,104, filed September 14, 1918. The back gage is formed on the forward end of a carrier 80 which is connected by a link 82 with the back gage locking slide 28, one end of the link being pivoted upon a stud 84 secured to the carrier 30 and' its other end being pivoted von a stud secured to the slide 28. The back gage carrier is guided by means of a bolt or pin 36 secured to the frame of the machine which extends through a horizontal slot in the carrier. The free end of an arm 38 is pivotally connected with the stud 34 which arm is secured to a rock shaft 40. An arm 42 is pivoted upon the shaft 40 and is connected with the arm 38 by a torsion spring 44 which is normally under no tension. During the work piercing movement of the needle 2, the back gage is first caused to lightly engage the work and is then pressed against the work under increasing pressure by means of a stud 46 on the needle actuating link 2O that. engages the arm 42 and through the torsion spring 44 and arm 88 thus actuates the back gage. The back gage and back rest are locked in engagement with the work at the limit of this stroke of the needle and until the needle returns to the limit of its loop drawing stroke. In order that the back gage may not interfere with the feeding of the work, means is provided for retracting the back gage after the needle has reached the limit of its loop drawing movement. To this end, the rock shaft 40 carries an arm 47, the free end of which is engaged by a lug 48 projecting from a sleeve 50 that is mounted to slide on the vertical red 14. A spring 52 is coiled about the.

rod 14 and is interposed between the lower end of the sleeve 50 and a collar 54 secured to the rod. Wlhen the back gage is unlocked at the limit et the loop drawing stroke of the needle, the coiled spring 52 acts through the connecting mechanism to retract the back gage.` As the torsion spring 44 is under no tension at this time it will not interfere with this action ot the coiled spring` and, also, as the strength ot the coiled spring is considerably less than that ot' the torsion spring 44, the coiled spring will not interfere with the action of the torsion spring in advancing the back gage during the work piercing stroke of the needle.

The upward movement the rod 14 upon stopping the machine increases the tension of the coiled spring 52, which ensures the complete retraction of the back gage at this time.

To lock the slides 2G and 2S against backward movement .a locking bar 56 is provided having a rectangular' opening at its upper Iend through which the slides pass. The upper and lower surfaces ot the opening in the bar 56 are bevelled slightly at their edges as indicated in F 2, and the bar is arranged at right angles to the slides in such a posit-ion that a tilting movement of the bar will torce the two slides together and lock them against backward movement with relation to the locking bar. The upper end ot the locking bar is received in a recess in a slide 5T rigidly secured to the machine trame. The lower end ot the locking bar 56 is engaged by a spring pressed plunger 58 which forces the bar in a direction to hold a cam roll G0 atthe lower end ot' the bar in contact with a cam (S2 on the cam shaft ot the machine. The plunger 58 at its end remote from the locking bar is mounted to slide in the hub ot' a screw 64 mounted in the machine frame and at the end which contacts with the locking bar is provided with a head between which and the hub ot' the screw 64 its actuating spring 66 is located. The arrangement of the locking bar 56, the spring pressed plunger 5S vand the cam G2 is such that movement of the lower end of the bar by the cam against the action ot the spring pressed plunger unlocks the slides 26 and 2S, while a movement of the lower end or' the locking bar under the influence ot' the spring pressed plunger loc-ks the slides.

The slide 26 is pressed toward the shoe by a spring pressed arm G8 `iournaled at its lower end in the irame of the machine and having its upper end in engagement with the rear -end oit' the slide.

llhile it is preferred to employ the specilic construction and arrangement ot parts illustrated and described, it is to be understood that this construction and arrangen'ient is not essential except so far as specilied in the claims, and may be changed or modilied without departing from the broader features ot' the invention.

The nature and scope ot the present invention having been indicated, and a machine embodying the several i'features of the invention in their preferred torni having been specifically described, what is claimed is l. An inseam shoe sewing machine having, in combination, stitch forming devices including curved hook needle, a back gage movable towards and trom the work, means tor locking the back gage against the work and for unlocking the back gage, a spring acting on said gage, means for increasing the tension ot the spring to press the back gage against the work and tor descreasing the tension ot the sprinf` after the gage is locked in position, and mans for retracting the back 2. An inseam shoe sewing machine having, in combination, stitch forming devices including a curved hook needle, a back gage movable towards and trom the work, means for locking the back gage against the work and for unlocking the back gage, a spring acting on said gage, means tor increasing the tension oi the spring to press the back gage against the work and for decreasing the tension of the spring at'ter the gage is locked in position, and a retracting spring tensioned by the movement ot' the back gage against the work for retracting the back gage.

3. An inseam shoe sewing machine Ihaving, in combination, stitch forming devices including a curved hook needle, a back gage movable towards and from the work, means tor locking the back gage against the work and for unlocking the back gage, a spring acting on said gage, means t'or increasing the tension of the spring to press the back gage against the work and for decreasing the tensionotl the spring after the gage is locked in position, a retracting spring Jfor retracting the back gage, and means acting on stopping the machine to increase the tension of said retracting sprino.

ALFRED BFownnn

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