Patent GB-207548-A (GB)
Title: Pattern grading machine
IPC: A43D8/10
Filed: 1923-11-23
Abstract: 207,548. Preston, M. V. Nov. 23, 1922, [Convention date]. Pantographic apparatus.-Comprises improvements in apparatus of the kind described in Specification 13302/10 for enlarging, reducing or reproducing patterns for boots &c., such apparatus comprising a model pattern 14 and a sheet of material 15 mounted together on a movable support 13, a guide 22 for the mod'el, and cutting means for the material carried by a fixed head 11, and pantograph linkage 24, 25 connecting the guide to the cutting means. The link 24 is pivoted to a block 26 and is also connected to a block 27 in such a way that when oscillated about the block 26 it moves the block 27 proportionally to the movement of the carrier 13 to or from the head 11. Either of the blocks 26, 27 can be connected to the head 11 by a slide 28 connected by a pivot 31 to a slidable bar 32, while at the same time the other block is connected to the guide 22 by a holder 29 for a rod 30 carrying the guide, the holder 29 being connected by a pivot 33 to a slidable bar 34, the bars being connected to the corresponding blocks by pins 81, 84. The cutting means according to the invention comprise two cooperating relatively movable members, one of which can be adjusted for alignment with the other. As shown in Figs. 2 and 7, these members consist of a punch 16 and die 17 disposed one on each side of a slot 18 into which the sheet 15 projects. The die is clamped by a screw 43 to the head 11 while the punch is secured by a chuck 45 to a bar 21, preferably of square section, disposed' in V-grooves in members 46, 47. The member 46 is L-shaped and is formed with open-ended slots 52, Fig. 6, in its head 46a to facilitate adjustment of the punch into alignment with the die; the member 46 is clamped by screws 51. Shims 48 may be inserted between the members 46, 47. The bar 21 is reciprocated by a crank pin 20 on a shaft 19. An apertured support 68 for the sheet 15 is mounted over the punch. In order that the ratio of enlargement or reduction may be varied for parts of the pattern, the rod 30 is provided with adjustable stops 56, 57, Fig. 3, which can be clamped to it by screws 61, and the holder 29 is formed with an arm 60 having a fixed stop 58. The guide 22 can thus be moved independently of other adjustment through a distance determined by the settings of the stops. The rod 30 carries an index 40 coacting with a scale 39 on the holder 29. The index is marked on a slotted plate which can be adjusted on the rod and secure thereto by screws 65. The guide 22 has a flat face in contact with the model 14 and is mounted so as to be rotatable about a line in the flat face. Adjustment of the slide 28 is provided by a pin 36 adapted to engage in one of a number of holes 37. The slid'e is moved by rotation of a pinion 66 engaging rack teeth on a rod 67 secured to the slide. The slide is marked with a scale coacting with an index ou the head 11. When the pattern is to be reproduced without change of size. the setting is such that the flat face of the guide 22 and the axis of the pivot 31 are both in alignment with that point of the die 17 which is farthest to the left in Fig. 7.