Patent GB-320939-A (GB)
Title: Improvements in or relating to sewing machines for use in the manufacture of boots or shoes
IPC: D05B15/00
Filed: 1928-07-27
Abstract: 320,939. British United Shoe Machinery Co., Ltd., and Bates, A. July 27, 1928. Feed by needles; boot-sole stitching and lasting machines.-In curved hook-needle sewing machines of the type described in Specifications 4173/12, 168,403 and 317,921 for stitching together the sole and upper of turn shoes without a last, the work is fed continuously by the alternate feeding action of different work-engaging members. In the preferred form, the work is fed first by the needle, presser, back-guage and horn, acting together, and then by the usual feed member. In the form shown in Fig. 1, the curved needle is fixed in a lever 2 on a spindle 3 rocked by a link connection to a follower in a cam track in the usual way to impart the workpenetrating movement. The spindle 3 is also capable of an axial movement to impart feeding motion to the needle. For this purpose, tho spindle is connected to an arm 4 carried by the needle-feed slide 5 reciprocating across the machine in a boss 7 projecting from the main feed slide 8. The needle-feed slide 5 is operated through a bell crank lever 10 pivoted thereon on a stud 9 and connected at its upper end to a lever fixed on the forward end of a rock-shaft 14 operated from the feed cam 15 on the cam shaft 16. The other arm of the lever 10 is pivoted at one end 17 to a link 18 which is pivoted in turn to an adjustable arm 20 pivoted to a bracket 21 on the machine frame. As the lever 10 is rocked on its pivot 9, the link 18 swings about its pivotal connection 19 to the arm 20 and the slide 5 moves across the machine. When the slide 5 is at the end of its feeding stroke, the axis of the pivot at 17 and the axis of the pivot of the arm 20 are in alignment and the arm 20 may be adjusted about its pivot to change the length of the feed stroke and so vary the stitch. The slide 5 has a downwardly projecting arm 221 in which is rotatably mounted a spindle 22 in a bearing 23 carrying the presser or bender 24. The spindle 22 is moved axially with the needle to assist in feeding the work by the slide 5. An arm 26 is fixed to the spindle and is coupled to a cam follower lever 29 working with the cam 30 by links 27, 28, to swing the presser into and out of engagement with the work. The usual back gauge may also be provided. Feed by devices engaging upper surface of work.-A feed point 31 is fixed to the bottom of a bar 32 sliding vertically in a bearing 33 on the main feed slide 8. The bar is urged upwardly by a spring and is depressed into engagement with the work by a lever 34 operated by a lever 37 following a cam track in the feed cam 15. The lever 34 can move relatively to the lever 37 for feeding movements without becoming disengaged therefrom. The feed slide 8 is operated by a bell-crank lever 41 pivoted on it at 40. One arm of the lever has a cam roll engaging the same cam groove as the cam roll for the needle feed mechanism and the other is pivoted at 42 to a guide link 43 pivoted to the link 20 and the feed is capable of adjustment thereby in the same way as the needle feed mechanism. The feed point may be replaced by a feed foot for channelled work. Work supports, horns; welting and turnshoe.- The horn 44, in addition to its rotary and vertical movement, can rock in the direction of feed on a horizontal pivot 45. The horn and its raising and lowering mechanism are mounted on a bracket 46 pivoted at 45 to the machine frame. The bracket carries an arm 47 connected by a link 48 to the arm 221 on the needle-feed slide 5 so that the tip of the horn is rocked about the pivot 45 as the needle and bender move laterally to feed the work. The length of feed may be controlled by the rotation of the horn so as to vary the stitches round the toe. For this purpose, the adjustable arm 20 is connected to a lever 53 pivoted to the horn by a rod 50. The lever 53 is pivoted at 54 and its free end 55 carries a cam roll held by a spring against a cam 56 in the horn spindle 57 so that as the horn is swung round to sew round the toe of the shoe, the feed length and stitch are reduced.