Patent GB-191402552-A (GB)
Title: Improvements in Change Box Mechanism for Looms.
IPC: D03D43/00
Filed: 1914-01-31
Granted: 1915-02-01
Abstract: 2552. Pickles Bros., and Smith, E. Jan. 31. Change-box motions.-In a change-box motion of the type in which an indicator lever is moved step by step lengthways over successive portions, such as peg lags, of the pattern surface, a supplementary pattern cylinder is, employed to control the motions of the primary surface, which is adapted to be moved in either a forward or a backward direction. The primary pattern barrel 2, Fig. 1, is secured to a shaft 2<c>, mounted to rotate in fixed bearings, and carries lags 2<a> having 'pegs 16, 16<a> of different heights to act upon an indicator bracket 3 adapted to be traversed by a screw 4, which is rotatably mounted in the outer ends of levers 6, 6<a> on a shaft 7. The other end 6<b> of the lever 6<a> has a pin engaged in a slot in a rod 8 connected to a lever on a shaft 10, Fig. 2, on which is secured a lever 11 having a pin 12 working in the slotted end 12<a> of a rod 14, which is reciprocated by an eccentric on the bottom shaft, so that a catch 13, pivoted to it and normally held by a spring 13<a> in the 'position shown, acts on the pin 12 to rock the shaft 10 and raise the outer ends of the levers 6, 6<a> against the action of a spring, so that the screw 4 is raised and a catch-wheel 24 thereon is engaged by one of two catches 5, 5<a> to rotate the screw and move the bracket 3 one step. When the bracket descends, it is stopped in one of three positions by the surface of the lag 2<a>, a pin 16<a>, or a pin 16, so that the end 6<b> of the lever 6<a> may act through suitable rod, lever, and catch-piece devices to position the setting-levers of -the box-operating mechanism. The supplementary pattern barrel 32, Fig. 1, which is loosely mounted on the shaft 2<c>, carries cards 32<a> with pins s, and controls the position of an indicator lever 33 on a shaft 34, which is connected by a lever 36, Fig. 6, and a link 37 to a plate 38, pivoted at 38<a> and having pivoted thereto spring-connected levers 39, 40 arranged to control the catches 30, 30<a> which engage the pin-wheel 31 for rotating the primary barrel 2, and the rotation of the supplementary barrel 32, which is effected by a pin-wheel 43 and a catch 42 pivoted on a lever 29 rocked by a pin on the rod 8, is controlled by pegs 45 on the ends of the lags 2<a> of'the primary barrel acting through a lever 46, a;shaft 44<a>, and a lever 44, which acts on a pin on the catch 42 to hold the catch clear of the pin-wheel 43, or allows engagement of the catch and pin-wheel, in accordance with its position. Rotation of the barrel 2 when the indicator bracket 3 is at the end of its traverse is effected by an extension 25<a> or 25<b>, on a bracket 25 pivoted to the bracket 3, being stopped as the bracket 3 descends by the upper end of a lever 26 or 26<a>, the other end of the bracket 25 being thereby depressed to cause a catch to free the lever 29, which carries the catches 30, 30<a>, so that the catches are lowered by a spring acting on the lever, and when the other end of the lever 29 is depressed by the pin on the rod 8, the barrel 2 is rotated in the desired direction. As the barrel 2 is rotated, a cam 5<c>, Fig. 2, on its shaft acts on the catches 5, 5<a> to move one out of action and the other into action, so that reversal of the movements of the screw 4 and the indicator bracket 3 is effected. The positions of the levers 26, 26<a> are controlled. by a cam on the shaft 2<c> acting on a blade spring on the lever 26, the blade spring being held against the cam by the action of a helical spring on the lever 26, which is secured to the same shaft 26<b> as is the lever 26<a>. When the bracket 3 is at the left side of the barrel 2, so that the extension 25<a> is in position to engage the lever 26, and the in-. dicator lever 33 is raised by a peg s to rock the shaft 34, a lever on this shaft moves the lever 26 beyond the position to engage the extension 25<a>, so that the bracket 3 may descend over the last peg hole on the lag 2<a>, and the barrel 2 is not turned, since the retaining-catch of the lever 29 is not moved. After the last peg has acted, the cylinder 2 is reversed and is turned at, each movement of the lever 29, the peg s remaining in action and the turning-catches 5, 5<a> of the screw,4 being held out of action as the cam 5<c> rotates, so that the indicator bracket 3 returns to the commencement of the pattern. If the pattern is of such a length that the bracket 3 should commence its return in the middle of a lag, a pin 60 is placed in position to act oa the extension 25<b> to cause reversal of the screw 4 and turning of the barrel 2. The weft stop -motion may act through a rod 50, Fig. 2, and a lever 51 to move the catch 13 into the inoperative position to stop the change-box mechanism.