Patent GB-190215327-A (GB)
Title: Improvements in Sewing Machines chiefly designed for Boots and Shoes.
Filed: 1902-07-09
Granted: 1903-01-01
Abstract: 15,327. Lake, H. H., [Duplessis Pegging and Sewing Machine Co.]. July 9. Boot-sole stitching-machines ; leather - sewing machines; lock-stitch hook sewing-machines; needles, hook, cast-off devices for; governing under thread.- Consists of a number of improvements in machines intended chiefly for sewing the outsole to the welt. Fig. 4 shows a right-hand elevation, and Fig. 5 a sectional view. The loop of thread drawn up through the work by the curved needle is carried round a fixed bobbin B<2>, Fig. 5 by an oscillating book H<36> shown in position in Fig. 20 and separately in Fig. 29. The hook is carried at its centre by an arm H<47> of a disc carried by the hook shaft H<24>, and oscillated by a segment gear H<16> pivoted on a pin B<18>. The segment H<16> is connected by a universal joint with its cam-lever. The hook, Fig. 29, is formed with an oblique chisel point H<41> for entering the needle loop, and with a rearwardly-turned hook H<42> for drawing the loop round the bobbin case, Fig. 20. On its inner face is a deep cast-off groove H<56> becoming shallow towards the point, and at its tail end are two flanges H<53>, H<54>, adapted to act as a shield to keep the loop off the needle during the take-up. The inner flange H<54> is pointed so that it readily inserts itself behind the loop. An oscillating spreading- finger S<5>, pivoted at S<22>, Fig. 20, is provided. It has three functions-to spread the loop for the entry of the point H<41>, to assist the loop into the book H<42>, and to prevent the loop from snapping over the point H<41> as the hook retires. The finger S<5> is oscillated from its cam S, Fig. 4, by linkage S<17>, S<19>, S<21>, &c., so arranged that the link S<19> can be carried either over or, as shown, under the feed-carriage. The bobbin case is of double conical shape with a flat back, as shown in Figs. 5 and 34. It is loosely mounted in a race-way formed by the hook-block and a cover B<28>, and is prevented from rotation by a nose B<33> engaging a slot in the cover. The cover is attached to the hook-block by two bolts, each carrying two nuts, which grip the projecting flange of the cover between them, so that the position of the cover and the amount of play of the bobbin case can be readily adjusted. The bobbin is not mounted directly on the fixed central stud B<13>, Fig. 34, but is slidably keyed on a loose sleeve B<17> retained between a shoulder of the stud B<13> and a spider spring B<26>, which prevents the free rotation of the bobbin. The bobbin is retained in the case by a clip B<18> pivoted at B<20> to the stud B<13>, and held in either the closed or open position by a spring B<23> in the stud B<13> . The front of the bobbin case is closed by the bobbin, and between its back and the oscillating disc which carries the hook is a fixed plate B<60>, Fig. 5. Governing needle thread; work-supports; perforating-devices.-The pull-off or thread-measuring device, instead of being at the rear of the machine, comprises a rod Q<1> pivoted to a stud A<9> carried by the awl lever A' near the middle of its length, this stud also serving for the cam-roll of the awl lever. The thread passes through a slot in the rod Q<1> and under the rolls R<1>, Z<1> on either side thereof. The amount of thread pulled off, and therefore the position of the lock in the material, is adjusted by varying the position of the roll R<1>, which for this purpose is mounted in a triangular frame pivoted at R<3> and connected to a nut R<12> sliding on a guide R<5> and traversed by a milled-bead screw R<7>. An additional adjustment for the same purpose is obtained by varying the length of slot in the rod Q<1> by means of a screwed pin forming the bottom thereof. The rod Q<1> is guided in a swivelling guide. The rolls Z<1>, for automatically regulating the length of thread according to the thickness of work, is carried in a U-shaped frame, Fig. 60, so as to clear the thread. This frame is pivoted at Z<5>, and is connected to the locking-bar W<2>, Fig. 4, which is forked at its front end to engage the arm W<5> of the work-support W<11> pivoted at W<8>. The bar W<2> is locked by the lever W<1> pivoted at W<22>. The lock is manually released by the cam-hub W<15> of the hand-lever W<16>, which on its further movement engages the roller W<13> and depresses the work-support. The auxiliary take-up arm, pivoted at T<8>, Fig. 5, is of the J-shape shown, so as to clear other moving parts. Its upward motion under the action of the spring T<22> is limited by a horizontal arm carrying a set-screw which engages the base-plate D<6>. The thread sheave T<26>, mounted on the pivot T<8>, is formed with a ratchet-wheel T<31>, Fig. 61, to prevent pulling back of the thread. The bracket for the pawl, the sleeve for the sheave T<26>, and the pin T<8> itself are all secured in place by a nut T<25>. Guiding materials ; feed.-Fig. 47 shows the feedcarriage carrying the presser-foot P<7> and work gauge U<3>. The work gauge can be adjusted, while the machine is running, by means of a handle U<5>, Fig. 4, mounted in the frame and connected by gearing with the gauge. An adjustable stop U<28> for the gauge handle is provided, and its shaft is mounted in a split friction bearing U'‹. The common pivot on the feed-carriage for the cam-lever F<1> and the feed-adjusting lever F<25>, Fig. 4, consists of a bolt having flat sides adapted to engage the slot F<13> Fig. 47. Needles, hook, threading-devices for.-The thread finger which co-operates with the looper in laying the thread in the needle hook, is mounted more forwardly than usual, so that its path intersects that of the needle at right-angles, and it is caused to give up thread as the needle rises in a series of small jerks, produced by slight steps on the thread finger cam.