US2038283A - Lockstitch shoe sewing machine - Google Patents

Description

April 2l, 1936. o. R. HAAs LOCKSTITCH' SHOE SEWING MACHINE 2 Shets-Sheet Original Filed Jan. 14, 1933 TLUBTUP Witness O. R, HAAS LOCKSTITCH SHOE SEWING MACHINE prl 2, 1936.

2 sheets-sheet 2 Original Filed Jan. 14, 1933 Inv @f7/E071 wf, @by 6,55% h Wzlmess Mf- WWW/9% Patented Apr. 21, 1936 UNITE STATES United Shoe Machinery Corporatiom Paterson, N. J., a corporation of New Jersey Original application January-14, 1933, Serial No. 651,803. Divided and thisapplication January 30, 193.5, Serial No. 4,032;y

3 Claims..

The present invention relates to lockstitch shoe sewing machines for connecting the outsole with the welt, lasted upper and insole of a Goodyear welt shoe, said machine being of the same construction and operation as that described in applicants pending application Serial No. 651,803, i'lled'January. 14, 1933 of which the present application is a division.

The object of the present invention is to improve the, construction, arrangement and mode of operation of certain of the thread manipulating parts ofV outsole shoe sewing machines.

With the above and other objects in view, as will hereinafter appear, a feature of the present invention contemplates the provision in an outsole shoe sewing machine of a new and improved thread measuring mechanism for accurately measuring and controlling the locking thread forming the seam of a shoe being operated upon.

This and other features of the invention, including certain novel and improved constructions and arrangements of parts are hereinafter described in the following detailed specification, and are more particularly pointed out in the appended claims.

In the drawings, Fig. 1 is a view in side elevation partly in section and partly broken away of the sewing mechanism looking from the left hand side of a machine embodying the features of the present invention; Fig. 2 is a plan view partly broken away and in section of the front part of the machine; and Fig. 3 is a view in front elevation, partly broken away, of the same parts of the machine.

The sewing mechanism of the machine embodying the present invention is substantially the same except as hereinafter described, as in the machine of applicants co-pending application Serial No. 600,016, led March 19, 1932, for Shoe sewing machines. The illustrated machine is operated from a sewing cam shaft I to actuate the stitch-forming and work feeding devices of the machine including a curved hook needle I2, a curved awl I4, a looper I6, a shuttle or rotary loop taker I8, a thread finger 20, a needle guide 22, a work support 24, a presser foot 26 and a feed slide 28 on which certain of the stitchforming devices are carried. The stitch-forming devices operate with a continuous feeding movement to form a lockstitch seam and, at the end of the operation, a stopping mechanism is arranged to bring the sewing mechanism to rest at a denite point with the needle and awl disengaged from the Work. To rotate the loop taker during sewing, there are provided driving connectionsv of theusual form between it and the sewingV shaft, the supply of locking thread being contained in a thread case 29 carried by the looptaker (see Fig. 3).

The thread extending between the shuttle and the. work is manipulated at the proper time to draw off and measure thread, as illustrated in Figure 3, from the shuttle in a sufficient amount to form the succeeding stitch. This operation isperformed .by a rotary thread measuring member 30s-having ngers for grasping the thread. As.. described more particularly in application Serial No. 600,016, referred to, the thread measuring member is mounted at the outer end of an inclined shaft 32 rotated by an elongated pinion 34 secured to the inner end of the shaft. The pinion 34 meshes with a rack 36 sliding in a guideway 38, and the rack is reciprocated by a cam 40 on the sewing cam shaft through connections comprising a link 42 (see Figure 1) connected at one end with a lever 44 fulcrumed on the machine at 46 having a gear segment 48 meshing with a corresponding segment 50 formed on a cam actuated arm 52. The other end of the link 42 is connected to the rack 36.

The thread measuring member 30 is also moved toward and from a position where it may graspl and measure thread so as not to interfere with the operation of the other stitch forming devices, and also according to the present invention may be moved slightly after grasping the thread to move it to one side of the needle and awl before releasing it. These movements are produced by reciprocating the shaft 32 longitudinally by a separately actuated bifurcated lever 54 embracing the grooved end of the shaft 32 and having pins 56 extending into the groove. 'Ihe lever 54 is-fulcrumed by a screw 58 threaded into the lever and passing loosely through a lug in the frame of the machine, and is operated by a gear segment 60 (Figure 3) meshing with teeth 62 formed on the hub of the lever 54. 'Ihe segment 60 is sup-ported by a screw 64 passing loosely through a lug in the machine frame and engaging at its threaded end the segment 60. The segment 60 is operated from the sewing cam shaft by an arm 66 extending upwardly from the segment 60, and having a cam follower at its end engaging a cam on the cam shaft. The movement of the thread measuring member 30 toward and away from a position where it may grasp the thread is, therefore, independent of its rotating movement and the thread, after being measured, may be retracted slightly as shown in Fig. 3 to escape the needle as it moves into the work.

The nature and scope of the invention having been indicated and a specific embodiment illustrating the several features of the invention having been described, what is claimed is: v

1. A lockstitch sewing machine having, in combination, stitch-forming devices including a locking thread case, a rotary loop taker for passing a loop' of thread about the thread case, a rotary locking thread measuring member arranged to engage the thread between the thread case and the work and to draw thread from the thread oase, means for rotating the thread measuring member to measure thread, and means separate from the rotating means for shifting the thread measuring member toward and from a position where it may engage the thread when the thread measuring member is rotated by said rotating means.

2. A lockstitch sewing machine having, in combination, stitch-forming devices including a locking thread case, a rotary loop taker for passing a loop of thread about the thread case, a rotary thread measuring member arranged to engage the thread between the thread case andA the Work and to draw thread from the thread case, a sewing cam shaft for the stitch-forming devices, connections between the cam shaft and the thread measuring member for rotating the measuring member to measure thread, and additional connections between the cam shaft and the measuring member for shifting the thread measuring member toward and from a position where it may engage the thread when the measuring member is actuated by the rotating connections.

3. A lookstitch sewing machine having, in combination, stitch-forming devices including a locking thread case, a rotary loop taker for passing a loop of thread about the thread case, a rotary thread measuring member arranged to engage the thread between the thread case and the work and to draw thread from the thread case, a sew ing cam shaft for the stitch-forming devices, connections between the cam shaft and the thread measuring member for rotating the measuring member to measure thread, and additional connections between the cam shaft and the measuring member for shifting the thread measuring member toward and from a position where it may engage the thread when the measuring member is actuated by the rotating connections, said connections being operated by the cam shaft in proper timed relation to shift the thread measuring member into a position where it mayv engage the thread, then to rotate the measuring member to withdraw a supply of thread from the thread case, and thereafter, before releasing the thread, to shift the measuring member out of the position to Which it iirst was moved, and thereby prevent interference of the measured thread with the other stitch-forming devices.

OTTO R. HAAS.

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