US1999678A - Shoe stitching mechanism - Google Patents

Description

April 3Q, w35 y EGWOYLF www@ SHOE STITCHING MECHANI SM Filed April 25, v1932 2k Sheets-Sheet l `pl'l'ql 3U, 935. E. G, WOLF 1,999,678

SHOE STITCHING MECHANISM `Filed April 25, 1932 v 2 sheets-sheet 2 /f7l/6/7/of 5a effe M/ Patented Apr. 30, 1935 PATENT ortica,

Y 1,999,678 Y snes srrrernne Mechanism Eugene G. Wolf, St. Louis, Mo., assigner to Landis l Machine Company, St. Louis, Mo., a corporation of Missouri Application April 25, 1932, serialno; 607,305

9 Claims.

The invention relates to shoe stitching machinery and has been developed particularly in connection with lock stitch McKay machines although certain features of the invention may be used in other stitchers.

The invention consists in novel features of the presser foot and work feeding mechanism. h

The objects of the invention are to provide better means for Aclamping the work between the horn andthe presser foot, to facilitate the penetration of the Work by the needle and to improve the appearance of the work by avoiding the production of feed point marks between the stitches, and to make the stitching more even and the length of stitches more easily adjusted. These objects are attained, briey, by elongating the presser foot and recessing it laterally to receive the needle and feed point; by adjusting the feed point actuating mechanism so that the feed point always terminates its feeding movement in the axis of the needle; and by simplifying thestitch length adjusting means. l

A structure embodying these features is illustrated in the accompanying drawings in which- Figure 1 is a front view of the needle bar, presser foot bar, feed mechanism, and adjacent horn of a McKay machine with the point of the horn directed to the left.

Figure 2 is a side elevation of the same parts looking at the right hand side of the machine.

Figure 3 is a side view of the upper portion of the feed actuator lever showing its connection to its driving link and viewing these parts from the left hand side of the machine.

Figure 4 is a detail of some of the parts illustrated in Figure 1 which shows them in a different operating position.

Figure 5 is a horizontal section taken on the line 5--5 of Figure l with the feed point removed.

The general arrangement illustrated correspends to the structure of my copending application, Serial No. 579,610, i'lled December 7, 1931, and embodies a frame head i, a drive shaft 2, a rotatable horn 3, a vertically reciprocating needle bar 4, and a presser foot bar 5.

The presser foot 6 has its horizontal portion elongated so as to extend from the right hand side of the needle to the left hand side thereof overlying the tip of the horn 3 and this portion of the foot is provided with a lateral recess 'I (Figure 5) which opens towards the front of the machine and accommodates the needle 8 and the feed point 9 of the feeding element lil which is mounted on the lower end of an actuating lever II pivoted at I2 to a boss 5a on the presser foot bar 5 and driven by an actuating link llconnected to a lever Ilwhich is pivoted at its lower end I 5 on the machinerhead I and is oscillated at its upper lend by an offset member I5 which has a slide Ito, engaging the upper end of lever I4, and a slotted tongue Ib by which the member is adjustably secured by studV Ic to a shaft S provided with a crank i8 which carries a cam roller Il) engaging the groove 2d of the cam wheel 2l mounted on the drive shaft 2. Shaft S has projecting ears Il between which tongue ll) fits. Stud Ilic isreadily accessible from the front of lthe machine and by loosening this stud, the op- -erator may easily raise or lower member i6 on shaft S to vary the oscillation of lever I4 and the throw of lever II to vary the length of feeding movement which controls the length of stitch.

A pin 22 connects link I3 and lever I I and the yaxes of the bearing portions of thispin engaging the link and lever, respectively, are offset or disposed eccentrically of each other. By loosening the lock nuts on the threaded ends of the pin and rotating the pin on its axis to a different angular position, the offset bearings will shift the end of link I3 transversely of lever II varying the effective length of the connectionbetween levers l I and I4 and the relative position of the levers whereby the relation between element Ill and lever M can be adjusted so that at the end of the feeding movement the point 9 will lie in the axis A of the needle, as indicated in Figure 4. This desirable terminus of the feed point may be maintained irrespective of the extent of feeding movement which determines the length of the stitch and is controlled by the setting of member I5 on shaft I'I. The feed point always remains within the recess 'l in the presser foot.

Since the feed point functions by digging into the work slightly and since it terminates its stroke in the axis of the needle, it provides a depression for the needle to enter which tends to guide the needle and facilitates its passage through the work. Also, the surface of the leather will be free of feed point marks intermediate the stitches such as would be produced if the feed point depression were not in the needle axis.

By elongating the Work engaging portion of the presser foot, I provide increased contact area of the presser foot on the sole which tends to eliminate any presser foot marks on the sole; holds the sole flat against the pull of the needle and thread; and avoids the end of the presser foot digging into the horn when work is removed from the latter and irrespective of the angular position of the horn.

It is believed that the above specification and `the accompanying drawings clearly describe the the horn and provided With an elongated recess opening towards the front of the machine, :and a Work feeding element projecting into said recess and reciprocating back and forth therein transversely of the machine.

2. In a machine of the class described, a wor-k carrying rotatable horn having a substantially horizontal Work engaging tip, a presser foot having an elongated vvork engaging portion overlying said tip irrespective of Vthe angular position of the horn and provided with 'an elongated recess opening towards l'the front of the machine, -a needle which alternately projects through lsaid recess into said horn and is Withdrawn therefrom, and a AWork feeding element `projecting intoV said recess and reciprocating back :and forth therein 'transversely ofthe front of the machine.

3. In a Imachine of the class described, Work feeding mechanism including a reciprocating point arranged to fdig into the work 'to engage and feed the same, and a presser foot on the same side ofthe Werk 'as said point and arranged to overlie and bear against 'the Work 'through-out the `-1ength of, 'across the front of, and behind the 'stroke of said point.

4. In a machine of "theclass described, a lpresser 'foot bar, a horizontal Work engaging lfoot ='carried by said bar and elongated infansversely of the machine vand having an elongated recess, work feeding mechanism lcmnprising 'a lever pivoted on said bar and a Work engaging element Icarried by said lever and projecting into 'sa-id'recess :and movable vlongitudinally thereof by oscillation of said lever.M

5. In a machine of the class described, a needle, work feeding mechanism including a reciprocating Work engaging feed point, and means for aligning said feed point with the axis of said needle at the end of the feeding movement, said work feeding mechanism including a lever upon which said feed point is carried and a memberl pivoted to said lever for voscillating the same, the connection between said lever and member comprising a pin having parts disposed eccentrically of each other and movable about their axis to aline the feed point with the axis of the needle.

6. In la machine of the class described, a feed cam, a shaft with a crank engaging said cam,l an arm mounted on said shaft and adjustable radially thereof to vary the length of the stitch, a lever having a stationary pivot on the machine fra-me, said lever being oscillated by said arm, a feed point mounting lever, a connection between said levers, and means for varying the eiective length of said connection lto vary the relation between said levers whereby the terminal position fof the feed point may be maintained irrespective of the adjustment of said arm. v

7. In a machine of the :class described, a work engaging feed point, a lever for mounting and reciprccating -said feed point, a feed cam, means driven yby said cam and actuating said lever .and including a crank shaft of which the crank is ad- 'ijusta'ble ktransversely of the shaft to vary the extent cfthe feeding movement. f

8. iin a machine of the class described, a 'feed Icani, .a shaft oscillated `by said cam, a crank-slidabfly :mounted on 'said .shaft to'V vary the 4crank throw, a Work engaging .feed point driven by Vsalici crank, .and means for securing rsaid crank Ain 4desired position on said shaft, said means comprising sa `stud with its head readily :accessible to an operator .at the front of the machine.

9.' .A structure as set forth in claim 6 in which `the 'connection between the levers comprises n link and a pin extending through saidlinknnd one of said levers and `having individual `bearing portions engaging said link and lever, respectively, said portions fbeing disposed eccentrically of each other. Y

EUGENE G. WOLF4

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