Patent GB-335200-A (GB)
Title: Improvements in or relating to pattern grading or like generating machines
IPC: A43D8/10
Filed: 1929-04-19
Abstract: 335,200. British United Shoe Machinery Co., Ltd., and Kestell, T. A. April 19, 1929. Pantographic apparatus.-In a pattern grading or like generating machine, particularly for marking or cutting out boot and, shoe patterns, a movable model carrier is free to move in mutually perpendicular directions towards and across a model guide to cause the model to move past the guide in contact therewith, and a plurality of pantograph &c. mechanisms controlled by the movements of the model carrier are arranged to control the relative positions of a pattern material carrier and a pattern tracing tool. In the machine described the model and the pattern material are mounted on a common carrier which is movable in two directions at right-angles to each other, and two pantographs, each actuated by movement of the carrier in one of the said directions', are connected between the carrier and a support for the model guide to cause displacement of the latter, the pattern tracing tool being fixed. 'The machine comprises a standard 1 carrying a goose-neck arm 3 overlying another arm 5 at the free end of which is mounted the punch 7 for cutting the pattern. The standard 1 also carries a bracket 17 provided with guides 19 on which a carriage 21 is mounted on rollers 22 so as to be movable in a direction parallel to the arm 3. The carriage 21 is provided with guides 23, at right-angles to the guides 19, on which is mounted on rollers 27 a carriage 25 constituting the support for the model carrier 47 and the pattern material carrier 39, the carriage 25 being thus universally movable in a horizontal plane. The pattern material 35 is adapted to be gripped between clamping jaws 33 mounted on the carrier 39 which is slidably mounted for adjustment in the carriage 25 and can be secured by a clamp 43. The support 47 for the model or template 49 consists of a skeleton frame pivoted at 53 to the carriage 25 and adapted to be held in its horizontal operative position by a stop 55, the model being in this position at such a level that it can be moved into contact with a pin 15 constituting the model guide, and the frame 47 being above the level of the top of the pin. The frame 47 is formed with a number of slots as shown in Fig. 2, some parallel to the guides 19 and others parallel to the guides 23 and the model is clamped thereto by bolts 51 passing through the slots. An arm 57 extending from the carriage 21 is provided at its outer end with a guideway 59 in which is disposed a slide 61 carrying a vertical pivot 67 on which is mounted a trunnion 65 through which passes a rod 69 constituting the " width pantograph lever " which controls the difference as regards lateral dimensions between the model and the pattern. At its lower end the lever 69 is pivoted on a relatively fixed but adjustable centre 71 and at a point between this centre and the trunnion 65 it is provided with a pin 73 engaging a slide 75 which is displaceable on fixed guides 77 parallel to the arm 3. The adjustable centre 71 comprises a block 79 slidable in a groove in the lever 69 and pivoted on a vertical axis to a link 81 slidably mounted in guides in a fixed member 83 and pivoted at 85 to a grooved control lever 87, the other end of which is pivoted to a horizontallydisplaceable rack bar 91 manually movable by a pinion 93 and provided with graduations which are visible through a window 92. The lever 87 is also provided along its length with a slidable block which is pivoted to another block slidable in a fixed guide member 113 and connected by a pivot pin with another block in a manuallyrotatable arm 115. The centre 71 can thus be adjusted either by setting the arm 115 or by displacing the rack bar 91. 'The end of the arm 115 co-operates with a scale 125 to indicate the necessary position of the arm in conjunction with adjustment of the rack bar to produce a desired grading of the width of the pattern. For controlling the difference as regards longitudinal dimensions between the model and the pattern a " length pantograph lever " 129 similar to the lever 69 is employed, this lever being connected near one end by a trunnion 131 to a trolly 133 capable of displacement along a guide 135 carried by the slide 75. The trolly carries pins 137 engaging in a groove in a member 139 secured to the carrier 25 so that it receives the component movements of the carrier at right-angles to the arm 3. At its other end the lever 129 is mounted on an adjustable pivot 141 carried on the slide 75 and adapted to be adjusted by a rack 157 and a rotatable arm 163 similar to those above described in connection with the centre 71. At a point between the centres 131, 141, the lever 129 is connected by a pivot 167 with a slide 169 mounted on a guide 171 which is carried by the slide 75 and extends at right-angles to the guides 77. The guide pin 15 is adjustably mounted in a disc 173 which is mounted on the slide 169 so that it receives the resultant movements of this slide and the slide 75. An adjustment of either of the centres 71, 141 produces a displacement of the guide pin and means are therefore provided to enable the guide pin position to be corrected - when desired. Indicators 179, 181 on the slides 75, 169 show the extent of the guide pin displacement. The correction is effected by displacing either or both of the trunnions 65, 131 by means of a single actuating mechanism comprising a vertical shaft 189 carrying a pinion engaging a rack casing 191. The rack carries a pin passing through a slot 192 in a cruciform member 193 which can move in a direction parallel to the arm 3 and is connected at its ends by wires 185 to the trunnion 65. The pin passing through the slot 192 also enters a slot at right-angles to the slot 192 in a second cruciform member 195 which can move at right-angles to the arm 3 and is connected at its ends by wires 187 to the trunnion 131. The rack is adapted to be rotated by a hand wheel 183 through which the shaft 189 passes so as to vary the component displacements of the members 193, 195 produced by rotation of the shaft 189. The rack is arranged to be parallel with a slot 203 in which the guide 15 is adjustably mounted on the disc 173 and this slot is adapted to be rotated with the rack by means of the hand wheel 183 so as always to be at rightangles to the model at the point of engagement therewith. For this purpose the disc is carried by a rotatable member 201 which is connected by wires 217 to the wheel 183 so that the two turn in synchronism. The rotation of the shaft 189 is indicated on a scale on the wheel 183. A movable pattern holder is provided, comprising jaws 229 carried by a lever 232 which can beturned about a vertical pivot 231 by a hand lever 233 so as to lie in the inoperative position indicated in chain lines at the top of Fig. 2. When a pattern 234 has been cut it can be clamped between the jaws in the said position and then swung into position over the pattern board near the punch to indicate what adjustment of the board is necessary to enable a similar pattern tobe cut therefrom. Specification 258,651 is referred to.