Patent GB-153910-A (GB)
Title: Improvements in machines for cutting embroidery along the embroidery edge
IPC: D06H7/16
Filed: 1920-11-16
Abstract: 153,910. Tscherne, A; Jan. 21, 1920, [Convention date]. Vertical-cutter type.-Comprises an electrically driven machine for cutting embroidery along the embroidered edge in which a vertical rotary-disk cutter is employed, and in which guide and feeding rollers co-operate with gate members and an adjustable guide to feed the fabric to the knife, the feed being varied or interrupted with the variations in the tension of the fabric due to the varying resistance offered by the different parts of the embroidered edge. The cutting disk 3, Figs. 1, 2, 6, is driven from a belt 6 through gears 7 8, 9, and may be formed of two disks with alternate depressions and projections. Two gates 10, 11 between which the fabric is fed are mounted on a support 4, the lower gate being fixed and provided with a nose 13, while the upper gate is adjustable by a screw 12. The fabric also passes between roughened rollers 16, 17 exerting a lateral tension on the fabric and pressed together by a spring 16<1> acting on a pivoted arm 14 carrying the roller 16. The roller 17 is loose on a shaft 18, Fig. 8, but may be connected thereto by a friction disk 20 controlled by a spring 19 and milled head. The shaft 18 is driven from a belt 23 through friction gears 24, 25 and gears 26, 27. In the rear of the cutter 3 are feed rollers 29, 29<1>, the bearings 30 for which are tiltingly supported, the rollers being driven through belts 31, 100'. The bearing 30 is connected by an arm 37, link 38, bell-crank 40 and link 41 to a lever 42 carrying the friction roller 25, so that when the fabric is under strong tension the bearing 30 tilts and disconnects the wheels 24, 25. A spring (not shown) returns the bearing 30. The spindle of the roller 29 is also engaged by a slanting arm 14<1> from the curved lever 14, the roll 16 being thus influenced by tilting of the roller 29. Upper rollers 45<1> are spring-pressed into engagement with the rollers 29, 29<1> and may be swung out by a hand-lever 47 working over a quadrant 46. The fabric is lifted off the cutting tool with a twisting movement by a resilient guide 50 adjusted relatively to the tool by means of a wedge. The machine is driven by an electric motor which rotates a shaft through belt gearing to drive the ropes 6, 23 and, through a worm gear 57, one wheel 60 of a variable-speed friction gear, the wheel 60 moving across the face of a wheel 61 in one with a pulley 62 driving the rope 31. The wheel 61 is carried by a bell-crank 64, 67 pivoted at 66, and is pressed against the wheel 60 by a spring 70 and lever 69. The wheel 60 is traversed on its shaft by the movement of a forked arm on the shaft 76 which is turned from the lever 77. The pulley 53 is made in two portions 53, 79 pressed together by a spring 78. A coupling member 81 secured to the part 53 is fitted with a roller 82 adapted to engage in depressions in the periphery of a disk 84 having alternately arranged shallow and deep depressions. In one with this disk is a ratchet wheel 85 which is engaged by a spring pawl 88 carried at the end of a lever 86 operated by a footlever 89. When the latter is depressed the pawl turns the ratchet wheel through one tooth, moving the roller 82 from a shallow into a deep depression or vice versa, and clutching or de-clutching the wheel 53 to or from the driving-shaft.