GB731164A - Improvements in or relating to methods and machines suitable for the treatment of hides and skins - Google Patents

Abstract

731,164. Leather staking machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). March 31, 1953 [April 1, 1952], No. 8216/52. Class 76. Hides and skins are staked by being moved through a treatment zone and there subjected to the action of rotary work treating lolls having intermeshing blades extending along the rolls, the blades on one roll being relatively sharp and on the other roll, rounded. The rolls rotate in the direction of feed and feedretarding means, preferably in the form of cooperating rolls are provided, the feed-retarding means being effective to cause the blades of the treating rolls to apply to the hide or skin a tension suitably limited to 50 to 75 per cent of the rupture strength of the hide or skin, and to subject the hide or skin a series of flexures as the blades pass thereover. As shown in Figure 7, work treating rolls 20 and 22 rotating in the direction shown are provided respectively with rounded blades 28 and relatively sharp blades 26. The hide or skin to be treated is fed from table 54 between feed-retarding rollers 50 and 52 which are driven in the same direction as but at lower peripheral speed than the worktreating rolls 20, 22. The feed-retarding rolls, preferably rubber covered, may be provided with thick ribs 56 which are arranged as helices of opposite lead from points midway along the rolls, the ribs on one half of each roll being staggered with respect of those on the other half, but both being in phase with corresponding ribs on the other roll. The work-treating roller blades are also preferably in the form of helices as is shown in Fig. 8 wherein the upper roller has sets 184, 186, 188, 190 of rounded blades and the lower roller sets 192, 194, 196, 198 of sharp blades. The shaft carrying the upper feed retarding roll 50 (Fig. 7) is supported on arms 65 pivoted about 64, which arms are capable of vertical adjustment in slot 66 controlled by screw 70. The shafts of the lower feed-retarding roll are supported on bell cranks 72, pivoted about 74, and connected at their lower end by an adjustable screwed rod 76 to member 42. The screwed rod 76 passes freely through a block 75 on crank 72, the block being engaged by a spring 82 on one side and capable of engagement with an adjustable nut 78 on the other. The member 42 carries the lower work-treating roll bearing 40 and pivots about 44. The lower end of member 42 is connected through a dependent arm 46 integral with member 42 to a hydraulic piston 170 operating in cylinder 168. The raising or lowering of work-treating roll 22 and feed-retarding roll 52 is controlled by a pedal operating the hydraulic mechanism. Thus on depressing the pedal to displace the-rollers from the operating position shown in Fig. 7, the piston rod 170 enters the cylinder 168 to move, via arm 46, the member 42 anticlockwise thus lowering work-treating roll 22. On continued movement of member 42 the adjustable nut 78 on screwed rod 76 abuts the block 75 thereby rotating bell crank 72 in an anticlockwise direction to lower the feed-retarding roll 52, this movement not occurring until the work-treating rolls are disengaged. On the return movement to the operative position as the member 42 moves clockwise the bell crank 72 moves under the action of spring 82 to raise the feed-retarding roll and engage the workpiece. On continued clockwise movement of member 42 the worktreating roll is raised to the operative position and due to the compression of the spring 82 the bell crank 72 continues to press the lower feed-retarding roll into engagement with the upper roll. In order that the trailing portion of the hide may be treated an auxiliary staking device (not shown) may be brought into operation when required to treat the hide before passage to the feed-retarding rolls. Such auxiliary staking device may be in the form of a blade mounted below the workpiece on bell cranks 72, the trailing portion of the hide being engaged on this blade by depressing an auxiliary roll to flex the workpiece about the blade.