Patent GB-208217-A (GB)
Title: Improvements in or relating to machines for folding the edge of leather or similar material
IPC: C14B11/00
Filed: 1922-09-13
Abstract: 208,217. British United Shoe Machinery Co. Ltd., (United Shoe Machinery Corporation). Sept. 13, 1922. Folding edges of sheet material.-A machine for folding step by step the edges of pieces of leather &c. such as the uppers for boots and shoes, comprises a hollow base 29, Fig. 5, adapted to be mounted on a bench and having an arm 37 overhanging the bench; a movable cover 31 for the base provided with an arm overhanging the arm 37; and feeding, folding, and fold-pressing devices carried by the arms. When the cover is opened, the operating-devices carried thereby are disconnected from the actuating-mechanism mounted in the hollow base. The invention is described as applied to a machine of the kind comprising a fold-turning member or plough 13, Fig. 2, a co-operating gauge 15, a creaser 17, Fig. 1, a co-operating folding finger 19, an anvil 21, a co-operating hammer 23, and a gripping-knife 27 which operate in a similar manner to that described in Specification 19937/14 but are operated by the mechanism described below. The operating- devices are mounted in parallel arms, the upper arm carrying the snipping-knife and its actuating-mechanism being formed on the hinged cover 31. Anvil-operating and feed-controlling mechanism. -The anvil 21, Fig. 1, is rigid with an arm 43 on a sleeve 45 mounted in a cylindrical bearing. The sleeve is connected by a link 53, Fig. 7, and arms 49, 57 to a rocking shaft 59 having an arm 67 connected to a forked lever 71 embracing a cam 73 on the driving shaft 39. The lever 71 is connected by a link 79 to a lever 83 adapted to be operated by a treadle connection 87. By raising the lever 83 into contact with an adjustable stop 93, Fig. 2, a minimum fead is produced, a movable pin 89 determining the maximum feed. Hammer-operating mechanism; adjusting for thickness of material. The hammer 23, Fig. 1, is pivoted at 75 to the arm 43 carrying the anvil 21 so that both are rocked in unison. The hammer is operated by a reciprocating rod 125 passing through the sleeve 45 and connected to an arm 117, Fig. 5, which is oscillated by a lever 105 through link and cam mechanism 103, 97 from the driving shaft 39. The arm 105 is loosely mounted on a sleeve on the arm 117 and has an adjustable, screw 113 adapted to engage a casing 115 integral with the arm 117 to raise the hammer positively the hammer being lowered resiliently by a projection 109 on the lever 105 engaging a spring-pressed plunger 119 in the casing 115. In order to vary the path of reciprocation of the hammer with respect to the anvil to suit varying thickness of material under treatment, the screw 113 is adjusted while the machine is at rest. Margin-snipping mechanism. The snipping- knife 27, Fig. 2, which is brought into action when required to co-operate with the folding- plough 13 is mounted on an adjustably-pivoted bell-crank lever the upper arm of which is pivoted to a spring-controlled rod 143, Fig. 5, connected to a lever 151. The lever 151 is provided with a spring-controlled pawl 154, Fig. 9, which is normally held in the position shown by the end of a spring-controlled lever 163. When a treadle is operated, the pawl 154 is allowed to pass between lugs 161 on an arm 159 which is oscillated from an eccentric on the driving-shaft 39. The rod 143 is thereby reciprocated to operate the snipping-knife. The parts of the snipping-mechanism, other than the actuating- arm 159, are mounted on the upper arm 31 of the machine and are thus swung back when the machine is opened for inspection. Creaser. The creaser 17, Figs. 2 and 5, is resiliently pivoted to a spring-controlled holder 182 which is pivoted to a carrier 135. Gauge. The gauge 15 which determines the extent of the margin to be turned by the plough 13 is pivoted to the carrier 135 and is controlled by a spring to keep its operative end in engagement with the work. Folding finger. The finger 19, Fig. 2, is mounted on a lever 211, Fig. 7, pivoted to the overhanging arm 37 and provided with a forked pivoted yoke 215, Fig. 5, engaged by a crank pin on the driving-shaft. Work-holding device. The block 25, Fig. 5, which co-operates with the creaser 17 to hold the work during the return motion of the hammer and anvil, is mounted on an oscillating spring- controlled rod 219 operated by a cam on the driving-shaft 39. A finger piece 221 is provided to lower the block to facilitate removal or insertion of the work. Feed-initiating device. When the work is introduced into the machine, the hammer upon its first descent does not strike the edge of the work, and in order to cause the work to be fed, the hammer is provided with a feed finger 225, Figs. 1 and 4, operating in the manner described in the prior Specification. The finger 225 is secured by a screw to an eye 229 on a rockshaft 231 carrying an L-shaped mamber 233 in a recess in the hammer. The member 233 is controlled by a spring so that the finger may accommodate itself to work of different thicknesses.