Patent GB-299345-A (GB)
Title: Improvements in or relating to leather working machines
IPC: C14B1/12
Filed: 1927-05-16
Abstract: 299,345. Turner Tanning Machinery Co., Ltd., and Schettler, G. A. May 16, 1927. Rotating-tool machines.- In a hide-stretching machine of the kind in which a hide is stretched along the backbone or median line and also outwards from the median line, the time of operation of the backbone stretching tool is variable at the will of the operator, and the lateral stretching tools operate on the work while it is under tension. The work is clamped on a table and tools co-operate therwith to apply preliminary tension, whereafter the setting is effected. A stretching cylinder 1 is carried by arms 2 actuated through gearing by a shaft 7 driven from a primary shaft 9 through a clutch 8 controlled by a treadle 12. The treadle is connected to an arm 21 which engages a half cycle stop-disc 22 on a shaft 5, whereby the movement of the cylinder is arrested as it reaches both the operative and inoperative positions, so that the direction of operation is placed under control of the operator. Lateral stretching cylinders 23 are carried by arms 24 operated by eccentrics 26 on a shaft 27 driven through a clutch 28 and gears from the shaft 9. The clutch 28 is controlled through linkage by the half-cycle disc 22. The eccentrics 26 actuate the arms 24 through rods 48, toggle links 46, 47, and rods 53. A halfcycle stop disc 59 is provided on the shaft 27 to control the fork 43 so that the shaft makes a half revolution each time the clutch is put into operation and stops with the cylinders 23 in either operative or inoperative position. A table 60 is moved vertically in guides 61 to carry the work past the operating cylinders, being suspended by chains 63a passing over sprockets on a shaft 62 which is driven in opposite directions alternately to carry the table up and down. For this purpose clutches 64, 67 are provided controlled by a cam and intermediate mechanism, including a trip lever 80, whereby the positive connection between the cam and the clutch-shipper mechanism is automatically broken as soon as the table reaches its normal position and restored when the table is to be moved upwards. For moving the setting cylinders into inoperative position when the table reaches the top of its stroke and reversing the movement of the table a cam 89 is provided fixed to the edge of the table and actuating a linkage including members 91 - - - 95 which is also manually controllable by a lever 99. The work is held up to the operating cylinders by means of concave-faced bars 107 mounted on rocker arms 109 fulcrumed on suspended beams 111. The arms 109 are controlled in their vertical movements by springs and rollers 114 engaging guides, and are also formed with cam extensions 116 which engage the shafts 118 of the cylinders 23 to bring the supports and cylinders into correct alignment. The beams 111 are moved up and down together with the table by means of pulleys 119 and friction bands. A counter-balance system comprising a weight 136 and connections passing over pulleys is provided for balancing the weight of the table and the cylinder 1 and a separate weight 142 is provided for balancing the work supports. The work supports are locked in co-operative position with regard to the setting cylinders by bars 123 engaging beneath rollers 121 on the bearers 111, and operated by mechanism including members 125, 128<a>, 128<b> and a cam 128e on the table. For the longitudinal stretching operation the work is clamped against the upper edge of the table by a clamp bar 149 carried by the arms 2 which support the cylinder 1 and moved into operative position therewith. For clamping the work during the lateral stretching effected by the cylinders 23 a bar 150 is mounted to slide in the guides 61 for the table and is locked to the table on the rising of the latter by hooked levers 151 having thereon rollers 155 which engage caminclines 158. when the bar 150 is moved upwards by contact with the rising table, and cause the hooked lever-ends 151<a> to wedge beneath rollers 159 carried by bars 154 slidable in the ends of the table. The table and clamp remain in locked relation until the rollers in their descent reach the cam-recesses 157. A set of slicking tools and another pair of cylinders may be arranged above the cylinders 23 for further treatment of the work. The machine may be used for striking-out hides &c.