Patent GB-191319436-A (GB)
Title: Improvements in or relating to Heel-breasting Machines for use in the Manufacture of Boots and Shoes.
Inventor: WADE HAROLD
IPC: A43D87/00
Filed: 1913-08-27
Granted: 1914-08-27
Abstract: 19,436. Wade, H., [United Shoe Machinery Co.]. Aug. 27. B r e a s t i n g.-A machine for breasting heels is provided with improved knife - clamping means, with an adjustable gauge to determine the curvature of the knife, with means for positioning tne tread plate manually and then depressing it by power-operated means, and with means for locking the shoe-support during the breasting operation. The machine is of the type in which a knifecarrying slide 4, Fig. 1, is normally locked to an actuating-slide 6 reciprocated from the main shaft, and is disconnected from the slide by a trip lever 14 carrying an adjustable shank stop 16. The clamping-means for the breasting-knife 50, Figs. 4 and 5, comprise jaws 22 arranged along the side edges of the knife, and provided with arms 24 pivoted to a laterally-extending arm 20 of the slide 4 ; the arms 24 are adapted to be adjusted by a right and left banded screw 30. The jaws 22 are fitted with rotatable abutments 40, which engage the knife along substantially the entire extent of its side edges, and which are provided with V-shaped grooves having sides 43, 45 preferably arranged at an obtuse angle to each other. Each side of the knife is held along three lines, one along the rear side corner which engages the side 45 of the \/-ahaped groove, another along the line of contact of the side 43 with the rear face of the knife, and the third along the line in which the front side corner of the edge of the knife engages a wear-resisting plate 46 located along the front side of the bearings in which the abutment 40 is mounted. This form of clamp may be used to hold a flat knife, a knife of single or double curvature, or a flexible knife ; in the latter case, the curvature of the knife may be varied by rotation of the screw 30. In a modified construction of clamp, particularly for use with flexible knives, the side edges of the knife are engaged by V-shaped grooves in the jaws 22 themselves ; moreover, an adjustable abutment is provided to support the back of the knife, and to serve as a positioning- gauge. The knife 50, Figs. 4 and 5, is supported against longitudinal movement, during the breasting operation, but is adjustable longitudinally by means of a clamp 61, 67 at the lower end of a screw 60 ; when used with a flexible knife, the screw 60 is provided with lateral extensions having plane surfaces to engage the upper end of the knife. The tread plate 80, Fig. 1, is adjustably secured to a carrier 82 pivoted to a slide 90, to the upper end of which is pivoted a member 94 forming a bearing for an adjusting-screw 96. This screw is threaded through a connexion 98 mounted on a lever 100, which is pivotally connected to a bracket 92. Between the ends of the lever 100 are resilient connexions with a connecting-rod 106 and a treadle rod 108. The treadle-rod connexion is adjustable to vary the initial position of the tread plate, and acts through a comparatively light spring 109 ; the connecting-rod 106 acts through a heavy spring 107, and its lower end is connected to a lever 156 pivoted about a shaft 158. An off-set portion of this lever carries an adjustable ratchet plate 160, which is adapted to be engaged by a spring-pressed pawl 176 carried by a cam-actuated lever 170 ; the pawl receives a vertically-reciprocating movement from its cam, and is moved to engage the plate 160 by contact with a roller 182 carried by one arm of an adjustable, spring-pressed, three-armed lever 184. Movement of the treadle 150, therefore, first lowers the tread plate 80 on to the work through the rod 108, and then throws the main clutch into gear, whereupon the tread plate is lowered by the rod 106 through the power-operated connexions described. The front edge of the tread plate carries a knife gauge comprising a flexible member 350, Fig. 7, the ends of which are held by pivoted hook members 356 adjustable by a right and left screw 360. The back of the gauge member is furnished with a series of teeth 352, which extend into a groove in the tread plate.