Patent GB-357646-A (GB)
Title: Improvements in or relating to methods of or machines for finishing edges of sheet material
IPC: C14B11/00
Filed: 1930-06-28
Abstract: 357,646. Finishing edges of sheet material. UNITED SHOE MACHINERY CORPORATION, 140, Federal Street, Boston, U.S.A.-(Assignees of Coffey, J. B. ; South Boston, U.S.A.) June 28, 1930, No. 19688. Convention date, June 29, 1929. [Class 16.] In a machine for finishing the edges of sheet material such as leather by applying heat to the margin on one side and thereby causing the other side to curl towards the heated side, as described in Specification 26300/12, [Class 16, Books &c.], the heating means comprises a small intensely hot flame, such as an oxyacetylene flame, which is applied directly to the work. After curling, the edge is pressed by hammering &c., substantially as described in Specification 234,170, [Class 16, Books &c.]. The work passes over a table 9, Figs. 4 and 5, where its margin is bent upwards by a plough 11 and the flame 13, Fig. 8, is applied from a burner 15. A guard 19 is provided to limit the amount of work treated and also to serve to hold the work upon the table, and a hammer 28 is situated on the further side of the plough. A presser wheel 29 serves to hold the work and is rotatably mounted at one end of a small rod 31, the other end of which is attached to a rock-shaft 35, which carries an arm 37 attached by a spring 39 to a bar 41. The bar 41 is fitted with pins 44, any one of which may rest upon the upper surface of a fixed bracket 43; the arm 37 is held in position by a stopscrew 47, so that the position of the presser-wheel 29 can be adjusted. The guard 19 is horizontally slidable in a slot in the underside of a block 49, and is held in adjusted position by a screw 51. The block 49 carries an upright stem vertically slidable in a block 53 and held in adjusted position by a screw 55. The block 53 carries a bar 57 which slides in a fixed guideway and is held in adjusted position by a screw 61. A thumb-screw 59 and collar 60 provide means for adjusting the bar 57 and thereby the shield in a direction transverse to the direction of feed. To exert downward pressure on the stem of the block 49 there is attached an upright cylindrical member 65 internally screw-threaded to engage a hollow sleeve 67 carrying a rod 69. A compression spring 71, Fig. 5, is provided between the bottom of the sleeve 67 and the top of a collar 73 attached to the rod 69, so that the pressure of the shield 19 can be varied by turning the hollow sleeve 67. The burner 15, Figs. 4 and 8, comprises a removable tip flattened at its lower end and connected to the mixing- chamber 75, into which lead pipes 83, 85 carrying the gases. The tip has a series of small holes to form adjacent flames, giving a flat brush-like flame. The burner operates continuously and is movable into and out of operative position, and when in the latter position the flame is directed into an open-sided chamber 90 formed of refractory material. The movement of the burner is brought about by a spring-controlled rocking-lever 91 pivoted to a stationary arm 98, the movement being limited by a stop-screw 198. The lever 91 is rocked by a bell-crank lever carrying a treadle. A carrier 101 adjustably holds the pipe 77 of the burner and extends loosely through an eccentric bushing 105, which is held in position by a setscrew 107, Fig. 5, and is mounted in a bore on the outer end of the lever 91. A dovetail guidebar 120 rotatably mounted in the carrier 101 carries at its upper end a roller 113 running in a cam slot 115 in a stationary bracket 117 ; an adjusting-screw 121 permits of adjustment of the burner along the guide-bar 120. When the burner is in operative position, the fumes from the work enter a passage 94 leading through the hollow arm 98 to a flue.