Patent GB-436945-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D87/00
Filed: 1934-03-22
Abstract: 436,945. Securing boot heels. BRITISH UNITED SHOE MACHINERY CO., Ltd., JAMES, C. H., and BACON, W. J., Belgrave Road, Leicester. March 22, 1934, No. 8948. Addition to 411,143. [Class 60] Comprises various detail improvements in the heel-finishing machine described in the parent Specification, and comprising a pivotally-mounted jack J in the upper part of which the heel is clamped and in the lower part a templet M<3> is carried. In the operative position the jack is moved to present the heel to an abrasive band B backed by a presser roll P, and the heel and templet are given corresponding oscillating movements such that the whole of the curved periphery of the heel is presented to the band B whilst the templet M<3> runs in contact with a pair of fixed rolls 713 and causes the jack to move so that the heel is given a shape corresponding to that of the templet. In order to prevent, during movement of the jack from the loading position shown in Fig. 1 to the operative position, unconstrained movements of the jack due to the templet not being in contact with the rolls, with the consequent possibility of undesired contact between the heel and abrasive belt, means are provided to control the movement of the jack. In the construction shown the rolls 713, instead of being mounted on a fixed arm, are mounted on an arm 717b pivoted at 717<e> and having a lower extension 717d to which is pivotally attached the rod 847, which in the machine of the parent Specification was attached to an arm extending from the jack itself. The movements of the jack between the loading and operative positions, produced as described in the parent Specification by the rod 847, are therefore transferred to it through movement of the rolls 713, which remain in contact with the templet, so preventing unconstrained movements of the jack. The pair of springs 709 which maintain the contact between the templet and the rolls are attached to the ends of balance levers 709<a>, 709<b> centrally pivoted respectively on an arm 711<a> on the frame and on the jack. To improve the securing action of the belt B, the presser roll P is given a small axial reciprocation in timed relation to the oscillating movement of the heel. For this purpose the oscillating gear 877 carries a bracket having a ball-ended eccentric pin P<2> to which is connected one end of a rod P<3> which imparts an oscillating movement to a sleeve P<5> carrying a lug P<6> , with which one end of a slotted lever P is maintained in contact by a spring. The resulting oscillations of the lever are transferred by a rod P<13> to a bell-crank lever P<15> which carries a roll engaging a slot P<18> formed in the top of the arm 575 on which the roll P is mounted. The arm is thus given a small reciprocating movement along the rod 577 on which it is pivoted, the extent of which can be varied by adjustment along the slotted lever P<9> of the connection to the rod P<13>. Adjustable set screws 575<b> and 717<f> limit respectively the forward positions of the arm 575 and the jack J, so limiting the depth to which material can be removed from the heel. In place of the wearable templet described in the prior Specification a templet is employed consisting of steel plates M<2>, M<3>, corresponding substantially in outline respectively to the tread and attaching faces of the heel, secured perpendicularly to the ends of a rod M<1> the length of which is substantially equal to the height of the heel, which is mounted in the jack so that the templates bear on the rolls 713, and is rotated as described in the parent Specification. It is stated that in some cases improved results are obtained by slightly displacing the two plates angularly with regard to one another, so that their straight or breast edges are not quite parallel, and by making them slightly assymmetrical about their centre lines. A further modification of the machine of the parent Specification consists in substituting a rearwardly-extending arm 857<a>, Fig. 1, attached to the plunger 853 for the pin on the plunger previously used to contact with the rod 847 for moving the hooked end 849 of the rod into engagement with the oscillating operating pin, as described in the parent Specification. The plate 857<a> contacts with the hooked end of the rod 847 thus avoiding the previous necessity of adjusting the throw of the plunger when the angular position of the rod in a horizontal plane is altered by lateral adjustment of the jack. Specification 412,599, [Group VII], is referred to.