Patent GB-442097-A (GB)
Title: Improvements in and relating to machines for treating the edges of leather and similar materials
IPC: C14B11/00
Filed: 1934-10-09
Abstract: 442,097. Finishing edges of sheet materials. AHLBORN, A., 4, Frankenallee, Frankfort-on-Main, Germany. Oct. 9, 1934, No. 28912. Convention date, Oct. 9, 1933. [Class 42 (i)] In a machine for finishing the edges of pieces of leather or the like by shrinking the material on one side by heat to cause the unshrunken side to curl towards the shrunken side, and comprising feed members, the movement of which in the direction of the forward feed can be varied, and electrodes or leads fixed in a closed casing forming part of a pivotally mounted over-hanging arm on which also a pressure roller is mounted for pressing the work down, the feed members are disposed on a cross slide arrangement provided on an outrigger, so that the edges of work which is closed on itself as well as of work having broken edges or openings can be operated on. The frame 1 is provided with an integral extension or outrigger 2, and the driving shaft 5 of the machine is mounted in the frame and the outrigger. One end of the shaft terminates in a crank pin 7 which gives vertical reciprocations to the upper jaw 10 of the feed tongs and is disposed in a slide mounted in a horizontal slot in a further slide 9. The slide 9 carries the upper jaw 10, and is slidable vertically in another slide 13 carrying the lower jaw 14 of the feed tongs. The slide 13 is slidable horizontally on guide pins, and is engaged by a link 18 which can be adjusted in the slot of a segmentshaped link connected to a short shaft which is oscillated from the shaft 5 by means of an eccentric and levers ; adjustment of the link 18 results in the adjustment of the length of the horizontal reciprocations of the slide 13, and hence of the jaws 10 and 14 of the feed tongs. A bridge 26 secured to the front of the outrigger 2 has a roller 28 mounted therein on a pin which extends parallel to the outrigger; this roller co-operates with a pressure roller 57 between which rollers the work passes. The work may be fed by manually rotating the rollers 28, 57. The overhanging arm 3 of the machine is pivotally mounted on a central eccentric portion of a shaft 31 mounted in bearings in the frame 1, whereby on turning the shaft by means of a handwheel the arm 3 is moved in a direction transversely of the work. The arm 3 may be adjusted along the axis of the shaft 31, and also raised about the shaft by means of an adjusting-screw 53. The end of the screw 53 may bear on the outrigger 2, or on a plate secured to an edge-turning member secured to the table 16 of the outrigger. If desired, the arm 3 can be raised into an inoperative position and retained there by a spring- pressed follower 37. The arm 3 is hollow, and the head portion is provided with top and side plates and has mounted therein two electrodes 42 connected by cables 47. The bottom end of each electrode has rotatably mounted eccentrically thereon a holder 49. The singeing-iron is substantially U-shaped, and the legs fit into grooves in the electrodes, or, where a smaller size of iron is to be used, into grooves in the eccentric holders 49. The singeing-iron is secured in position by means of screws 51 which pass through clear holes in the holders 49 and engage screw-threaded holes in the iron. The products of combustion are drawn from the work through a slot 56 into the arm 3, and through an exhaust pipe connected to the arm 3. The pressure roller 57 is mounted on a lever secured to a shaft journalled on the arm 3, and spring means tends to rotate the shaft to cause the roller to press the work against the roller 28. The size of the table 16 on the outrigger 2 can be increased by clamping to the underside of the outrigger an extension 65 of an additional table. The shaft 5 is provided with a fast and a loose pulley, and the frame 1 has mounted thereon a belt-shifter 67.