Patent GB-190106605-A (GB)
Title: Improvements in or relating to Sewing Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1901-03-29
Granted: 1902-03-27
Abstract: 6605. Boult, A. J., [United Shoe Machinery Co.]. March 29. Boot-sole stitching-machines; lock-stitch hook sewing-machines; wax-thread machines; needles, hook, cast-off devices for.-Consists of improvements in details. Fig. 19 shows a section of the locking- thread casing parallel with the front of the machine. The locking-thread bobbin-casing S is carried in a casing s inclined to the plane of the needle. Rotation of the casing S is prevented by the thread nose s<4> engaging a fork at the end of a rod s'. The thread is taken from the needle by a hook from which it is taken by the hook N, which throws it round the bobbin casing. These hooks preferably oscillate in planes perpendicular to each other, the hook N moving in a plane perpendicular to the needle plane. Needle shields; needle-driving; perforating-devices.-Fig. 6 shows a section through the feedsleeve F. This sleeve carries the awl, needle, and needle guide segments d, c, e. The segments d, e are separated from each other and from the segment e and adjusting collar 9 by ball bearings. The side of the segment e away from the needle segment is a plain bearing and the greater friction on this side keeps the segment e stationary except when it is engaged by tappets on the needle segment. Feed.-The feed-sleeve F is moved laterally on its pin a' through a lever from a cam on the main shaft. A hand-operated cam forms an adjustable stop which limits the return of the cam lever towards the feed-cam, and by this means the feed is adjusted. Presser-feet; presser lifted automatically; governing needle thread.-The lever p, Fig. 12, carrying the presser-foot P, and pivoted at a<4> is operated by a lever p<2> carrying a block which slides in a slot p<1> in the lever p, the slot p<1> and lever p<2> being nearly at right-angles, so that any ordinary pressure on the presser-foot cannot move it. The lever p<2> is pivoted at a<5>, and is operated by a lever p<5> carrying a pawl p<11> adapted to engage a ratchet on one arm of the lever p<2>. The lever p<5> receives a constant movement from a cam, and when it is in its highest position, the pawl p<11> is disengaged from the rack by engagement of its tail with a fixed pin p<17>. The thread-measuring sheave M is carried on a lever m pivoted at a<10>. The upward, thread-pulling stroke of the lever m, due to the cam 4, always ends at the same point, but its downward thread-yielding motion, due to the spring m<4>, is limited by the slotted link m<7> connected to the lever p<2>, so that the amount of thread given depends on the thickness of the work. R, Fig. 9, is the take-up lever pivoted at a<10>. K is the thread-lock between the sheave M and the bobbin. The movable jaw k<1> is operated by an eccentric actuated by the lever k<2> and cam lever k<3>. Needles, hook, threading - devices for.-Fig. 21 shows a plan of the thread-eye Wand threading-hook L. The hook L is carried by a segment l moved in a guide of corresponding shape from a cam lever. Governing under thread.-The thread passes from the bobbin over the pin 34 and through a tension comprising a spring 30, Fig. 20, having a bent-up part 31 engaged by an adjusting-screw 32. Waxing thread.-A waxing-device which may be used comprises a tube h<1> with a stripper at each end and fed with wax from a chamber H. The bracket wherein the tube h<1 >is formed is heated by steam supplied by a pipe h<4>.