Patent GB-735316-A (GB)
Title: Last removing machine
Inventor: DOVE LAWRENCE HARRY
IPC: A43D3/10
Filed: 1952-09-22
Abstract: 735,316. Last-removing machine. STANDARD ENGINEERING CO., Ltd. Oct. 26, 1953 [Sept. 22, 1952], No. 23747/52. Class 17 (1). In a last-removing machine having means 19 to locate a last 7 and mechanical means for automatically moving a friction member 14, 40, such as a rubber pad, to push the seat portion of a shoe off a last, the friction member is mounted for forward movement under the action of a first pneumatic cylinder 5, 36, and for upward movement under the action of a second pneumatic cylinder 8, 38, valve mechanism 30, 32, 42, 43 being arranged so that these movements commence in a desired sequence, on initiation by a treadle 29 or the like, and subsequently proceed simultaneously. The valve controlling the second cylinder is generally opened in response to a predetermined forward movement of the friction member, e.g. as in Fig. 3, or in consequence of the friction member encountering an obstacle during its forward movement, e.g. as in Fig. 1. In the construction shown in Fig. 1 the piston rods of the cylinders 5 and 8 are pivoted at 10, and 11 to the mount of the friction member to which a return spring 16 is also connected. The position of cylinder 5 may be adjusted by means of screw 17 to regulate the path of member 14. The standard 19 swings about trunnion 20, carries a last mount 26, and is connected to stem 22, spring 24 on the latter urging the standard rearwardly and stop 23 limiting the outward movement. The machine is adjustable in height by means of pillar 2 and pin 3, and the standard is adjusted by screwsleeve 21. When pedal 29 is depressed valve 30 is actuated to admit compressed air to cylinder 5 and the resultant movement of member 14 moves standard 19 outwardly tripping lever 31 so that valve 32 is actuated to operate cylinder 8. The combined effect of the strokes of cylinders 5 and 8 is to move member 14 to remove the shoe from the last, and to rock member 14 so that its mid portion bears constantly and directly against the heel portion of the shoe. When pedal 29 is released the operation of cylinder 5 is reversed, spring 24 returns the standard, and level 31 is tripped reversely. The air pressure, indicated by gauges 35, is regulated by valves 33 adjusted by knobs 34. In the construction shown in Fig. 3 the friction member 40 is connected to the rod of the inclined first cylinder 36, to which the rod of the second cylinder 38 is pivoted at 39, passage of air to cylinder 36 is controlled by pedal operated valve 42, and when cylinder 36 is actuated it. causes cylinder 38 to pivot, such movement actuating, through 44, 45, 46, the valve 43 controlling cylinder 38. To accommodate lasts of different sizes linkage 44, 45, 46 may be adjusted at 47, the extension of the rod of cylinder 36 between block 40 and pivot 39 may be variable, or the last peg may be adjustable in standard 19. Block 40 may be carried by a mount 48 which is pivoted on an extension of the rod of cylinder 36 and adjustably inclined by screw 49. The cylinders are normally double acting.' Reference has been directed by the Comptroller to Specification 691,971.