Patent GB-190906001-A (GB)
Title: Improvements in or relating to Machines for Rounding or Trimming the Soles of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D27/00
Filed: 1908-01-16
Granted: 1909-04-16
Abstract: 6001. Boult, A. J., [United Shoe Machinery Co.]. Jan 16, 1908. Traversing-cutter type for cutting designs; verticalcutter type for cutting sheet material in direction of feed.-Relates to sole-rounding machines of the type in which a trimming-knife is caused to travel round a pattern by rotating either the pattern or the knife support, and consists in the provision of means independent of the forward movement of the knife or its associated parts for returning the knife to the point from which it started in the rounding operation after it has been carried beyond this point by the driving-mechanism or by the momentum of the parts, after the driving-mechanism has been thrown out of operation. The means for clamping and rotating the work and pattern, and the means for mounting and actuating the knife are the same as those described in Specification 18,954/02, [Class 17, Boots &c.]. The rotary knife-supporting table 8, Fig. 5, is driven from a shaft 20 by a two-speed mechanism which is described in Specification 1070/08, [Class 17, Boots &c.]. The mechanism for returning the knife to a fixed point after each cutting operation consists of a masked ratchet device 114,115, Figs. 4 and 5. The ratchet 114 is formed on the main driving-sleeve 23, which is fully described in the Specification 1070/08, [Class 17, Boots &c.], while the pawl 115 is carried by a lever 116, Fig. 4, and connected up to an eccentric 118 surrounding a sleeve on the rockshaft 37, which is also described in the same Specification. The pawl is thus continuously operated, and, when permitted to do so, it falls into engagement with the ratchet-wheel and rotates the driving-shaft 20 in a reverse direction to an extent which is determiued by a guard disk 119. This disk is cut away as shown in Fig. 4 to mask the greater portion of the ratchet-wheel. During the travel of the knife, the pawl is held out of engagement with the ratchet by a pin-and-slot device 124, 125, Fig. 4, at the upper end of a lever 123, which is connected through a yoke-piece 127, Fig. 2, to the hand-lever 75 which controls the stopping and starting mechanism. When the latter is depressed to start the travel of the knife, the yoke-piece is swung about its pivot to lift the lever 123, and so to raise the pawl. When the lever 75 is released, the pawl drops into engagement with the ratchet. This movement, however, is delayed until the driving-shaft has been brought to rest, and to effect this the yoke-piece 127 is provided with an arm 129, Fig. 2, carrying a roll 133 adapted to engage with a recessed disk 132, which is held in frictional engagement with the face of a pinion 38, Fig. 5, by a spring 135 ; this pinion forms part of the two-speed mechanism. Normally, the disk 132 is prevented from rotating ; but when the lever 75 is depressed, it is released and rotates until its recess is out of register with the roll 133, in which position the pawl 115 is out of engagement with its ratchet. When the hand-lever 75 swings upwards, the disk commences to rotate again, and continues until the roll again engages with the recess, whereupon the pawl drops into active position.