Patent GB-190315473-A (GB)
Title: Improvements in or relating to Trimming and Overseaming Machines
Inventor: BOULT ALFRED JULIUS
Filed: 1903-07-13
Granted: 1904-01-28
Abstract: 15,473. Boult, A. J., [Merrow Machine Co.]. July 13. Loop - stitching machines; overedge - stitching machines; frames.-The stitch is made by three threads, a needle thread 67, and two looper threads 60, 62. The needle 16, which is curved and has an eye near its point, is driven by a link from a counter-shaft 14, as shown in Fig. 2. The thread 60 passes through the eye of a looper 25, which both reciprocates and oscillates, so that its point moves backwards and forwards and up and down, and lays the thread over the edge of the fabric. The thread 62 passes through the eye of a looper 22, which reciprocates and is always below the fabric. The looper 22 takes a loop of needle thread below the fabric. Its loop is then taken by the looper 25 also below the fabric. The looper 25 then moves round the edge of the fabric and presents a loop of its own thread to the needle above the fabric, and so on. The loopers are mounted on a block 23, which slides to and fro on the inner side of a door 10<a> of the frame 10. The looper 22 is fixed to the block 23, while the looper 25 is pivoted to it, and also has a pair of arms engaging with cam-grooves in blocks 12<a>, 14<a> on the main and countershafts 12, 14, which are geared together. The cam-grooves thus reciprocate both loopers, while, in addition, they oscillate the looper 25. Governing under thread.-The hub of the looper 25 projects through the door 10<a> and acts as a take-up for the looper threads. Feed; guiding materials.-The feed-dog carrier 30 slides on a pivoted block 21<a> and is given a horizontal movement by a link 35 and an eccentric 34 on the shaft 12, and a vertical one by another eccentric 32 on the same shaft, which also raises and lowers a plate situated beside the feed-dog and sliding on the block 21<a>. The object of the plate is to engage with the edge of the work and prevent it from stretching. In order to vary the feed, the carrier 30 has to be exchanged for another one. To enable the eccentric 34 to be removed for this purpose, it is screwed on to its shaft and notches at 34<a>. It can thus be locked to the strap 35 by a key which fits into the notch 34<a> and also into notches 35<a> in the strap. On forcibly turning the shaft the eccentric is thus unscrewed. Trimming or cutting.-The edge of the work is trimmed by fixed and movable cutter blades. The fixed cutter 43 is adjustably carried on a standard 53, and the movable cutter 42 on an arm actuated by an eccentric on the main shaft. The movable cutter is shown in Fig. 16, and consists of a steel bar of L-section which is held diagonally in its clamp. The flange 42<b> forms the cutting- edge, while the flange 42<a> is always in engagement with the fixed blade, and serves as a guide. A shoot 59 discharges the parings from the machine. Thread-guiding eyes.-The looper threads pass through a series of guiding-eyes as shown in Fig. 1, the thread 60 also passing through a tube 61 to keep it clear of the shoot 59. The guiding-eye nearest the looper 22 for the thread 62 consists of a hole in the standard 53. The eye of the looper, when in its most advanced position, registers with this hole and the threading of the looper is thus facilitated.