Patent GB-631471-A (GB)
Title: Improvements in pattern-graduating machines
IPC: B43L13/10
Filed: 1947-01-20
Abstract: 631,471. Pantographic apparatus. PECHER, A. Jan. 20, 1947, No. 1796. Convention date, Jan. 30, 1946. [Class 97 (iii)] In a pattern graduating machine used for example in manufacturing shoes of different dimensions from a pattern, having a pantographic system in which two arms translate the pattern in two mutually perpendicular directions, means are provided for adjusting the scale of reproduction of the pattern in the work. The base-plate 1, Fig. 1, is provided with a girder 2 and a frame 3 serving as guides for a carriage 4 which runs by rollers 52 in a groove on the frame 3. A carriage 8 runs on rollers 7 along a channel-shaped bar 5 which at one end is rigidly connected to the carriage 4 and at the other end runs on a roller 6 on the girder 2. The carriage 8, thus capable of movement in two directions at right-angles, carries an extension arm 9 to which the pattern-follower 10 is attached and a cutting tool 51 for cutting the material clamped at 48 to' the girder 2. A table 13, supported by rollers on a plinth 11 for movement in the longitudinal direction of the carriage 8 itself carries plinths 14 on which a table 16 is mounted on rollers for movement in a perpendicular direction. The lengthpantographic arm 17 is tubular and contains two rods 18, 19, Fig. 4, each bearing an index mark co-operating with scales on the arm 17. The distant end of the rod 18 is pivoted at point 45 to a guide 22 sliding in a slide 23 which is connected to the carriage 4 by a cross-piece 24 and arms 25. The distant end of the rod 19 is pivoted at point 46 to a plate 26 provided with a groove in which slides a guide-bar 28 secured to the undersurface of the table 16. Similarly the width pantographic arm 29 is provided with two rods 30, 31, one of which is. attached, in a similar manner as rod 19, to its associated table 13 and the other rod 31 is pivoted to a guide 36 sliding on a slide 37 fixed to a carriage 38 which is moved on rollers 40 in a groove on the base-plate by means of an arm 42 in accordance with the longitudinal movements of carriage 8. The tubular arms 17, 29 are pivoted to plinths 44, 43 respectively situated beneath the normal centres of the tables 13, 16. In use the rod 18 is positioned at the scale marking appropriate to the shoe size of the pattern in use, e.g. 50s as shown in Fig. 5, and the rod 19 at the marking indicating the appropriate enlargement or diminution required. Movement of the follower 10 around the pattern, e.g. perpendicular to the axis of the base, is accompanied by movement of the cutter 51 with the carriage 8 and consequent pivoting of the arm 17 and the rods 18, 19 about the centre C. The attachment 46 of the rod 19 to the guide bar affixed to the table 16 will thereupon move through a distance YV whose magnitude corresponds to the setting of the rod 19. This movement results in a movement of the table 16 so that the resultant movement of the follower 10 is, e.g. the curve XV where XY represents its movement if rod 19 were set for no diminution or enlargement and consequently table 16 remained stationary. Simi. larly the arm 29 with its rods 30, 31 causes an enlarging or reducing movement of the table 13 for the component in the perpendicular direction, the movement of the carriage 8 relative to the base-plate 1 in the direction parallel to the longitudinal axis of the base-plate being transmitted. to the pivot guide 36 by means of the parts 42, 38. The positions of the plates 26, 34, to which the ends of the rods 19, 31 are pivoted, may be adjusted relatively to their points of attachment to their respective tables 16, 13 by means of the handles 28, 35.