Patent GB-411143-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D87/00
Filed: 1932-10-01
Abstract: 411,143. Scouring heels. BRITISH UNITED SHOE MACHINERY CO., Ltd., BATES, A., BARCLAY, W. R., and HAZELTON, G., Belgrave Road, Leicester. Oct. 1, 1932, No. 11660/34. Divided on 412,599, [Group VII]. [Class 60.] Relates to machines for finishing heels which are trimmed or do not require trimming. A machine for scouring unattached heels comprises a driven endless abrasive belt backed by a pressure roll having the contour of the heel and a pivotally mounted jack provided with heel clamping means rotated to cause the belt to scour the whole side and back surfaces, a model heel serving as templet means to control the relative aspect of presentation of the heel and tool. The machine is of twin type, so that work can be charged at one clamp while a heel is being scoured in the other. Each scouring means comprises a belt B of abrasive cloth passing over a lower pulley on a driven shaft 505 and an upper pulley on a driven shaft 541 carried by an arm 529 pivoted to an upwardly and rearwardly extending frame member 503. The tension of the belt is adjusted by a hand wheel 559 secured to a screwed shaft threaded in a cylindrical block engaging a bore in the arm 529, the lower end of the shaft being supported by a socket formed on the member 503. The belt is rendered flexible by slits 1" in length spaced 5/32" longitudinally of the belt, the lines of slits being #" apart and the slits in adjacent lines being staggered. If the belt is formed by lapping the ends of a strip, the abrasive is removed at the lapped joint. The belt is centralized by a roll 563 adjustable about a supporting member 569 so that the belt does not rub on the flanges of its pulleys. At the operative portion the belt is backed by a presser roll P carried by a pivoted arm 575 and urged toward the belt by a spring 581 adjustable in strength by a wing nut 587. The roll is of wood with a felt covering, rotates freely on a ball bearing 590, and has a contour complementary to the shape of the heel. A hand nut 594 secures the roll in position, and allows it to be changed for another of different contour. Each jack is supported by a bracket 605 laterally adjustable by screws 609 and adjustably clamping the stem 603 of a yoke 599 carrying on pivots 601 a block 597 secured to a rod 595 freelyrotatable in cross members of the jack593. This mounting allows the jack to turn about two axes at right angles. The jack carries clamps for a heel to be scoured at its upper portion, and clamps for a model heel at its lower portion. Each clamp comprises a sleeve 613 axially adjustable by a screw 617 and carrying bearings for a shaft 623 to which is keyed a pinion 641. The tread engaging clamps each have a pair of pins 689, 707 to locate the breast face. The seat engaging clamps each have triangularly disposed points 680 and a spring- pressed locating plunger 681 intended to engage a jig hole previously made in the heel. The clamp engaging the seat of the heel to be scoured is provided with a handle 631 for quick clamping and release, the shaft 623 being shouldered to abut against a thrust race engaged by a sleeve formed with cam slots engaging pins on the sleeve 613. The four pinions gear with a pair of racks 643 driven by pinions on a shaft 651 rotated by bevel gearing from a shaft 657 so that the heel H and model M rotate together. The model is urged by springs connected to the jack against rolls 713 carried by a member fixed to the yoke 599. The shaft 657 is rotated alternately in opposite directions to cause the heel to be oscillated from breast edge to breast edge around the sides and back and mechanism is provided for predetermining the number of oscillations. To this end a constantly driven shaft 723 drives a worm gearing with a worm wheel 733 rotating with a cam track 741 engaging a roll 743 on a link pivotally connected at each end with an arm 751 for controlling the adjacent jack. The arm 751 extends from a sleeve 753 rotatable about a shaft 755 and oscillated some 60‹ for each reciprocation of the link. Pinned to the shaft 755 immediately above the sleeve 753 is a sleeve 757 having three arms 759, 761 and 763. The arm 759 has a vertical bore for a plunger 765 cooperating with a vertical hole in an arm 769 integral with the sleeve 753, the plunger being spring-pressed downwardly but having a head co-operating with cam surfaces 801 on a plate 775 on a sleeve 773 above the sleeve 757 and freely mounted on the shaft 755. The plate 775 is formed with ratchet teeth 777 co-operating with a retaining pawl 787 and a driving pawl 833 pivoted to the arm 761. The head of the plunger 765 has a projection normally engaging a recess in a spring plunger 805 housed in a fixed bore. To operate the right hand jack the starting handle S is moved to the right causing a push rod 783 to trip the pawl 787 allowing the sleeve 773 to be turned counter clockwise by a spring 791 until a stop 795 on the sleeve contacts with an adjustable stop 797 which has previously been set to determine the number of oscillations the heel is to make. The cam surfaces 801 leave the plunger 765 and allow the plunger to clutch together the sleeves 753, 757, thus oscillating the shaft 755. As thereafter, these oscillate, the pawl 833 on the arm 761 is released from a cam surface 839 near the end of each oscillation and rotates the ratchet 777 one tooth. When the ratchet has been returned to starting position a pin 851 on the arm 763 is in engagement with a hook on a rod 847 pivoted to the lower portion of the jack, this rod having been brought into the path of oscillation of the pin by a finger 859 on the plate 775 engaging a washer 861 on a plunger normally urged outwards by a spring and slotted to engage the rod 847. Thus the heel is removed from the scouring belt at the conclusion of a predetermined number of oscillations. Reverse movement of the jack on release of the pawl 787 at the beginning of the operation is obtained by the finger 859 allowing the plunger to remove the rod 847 from the path of the pin. Oscillation of the shaft 755 is caused to oscillate the work piece and model heel by a rack 871 gearing with a pinion on a shaft connected by a telescopic shaft, and universal joints with the shaft 657, the rack being linked to an arm 867 on the shaft 755, a slot on the arm allowing adjustment of the angle of oscillation of the workpiece. According to the Provisional Specification the work and model are rotated in unison by a hand wheel, a disc on each shaft and links connecting the discs, and the work is brought up to the band by a treadle. Specifications 411,448 ; and 412,599, [Group VII], are referred to.