Patent GB-131441-A (GB)
Title: Improvements in or relating to Machines for Cutting Heel Lifts or other Parts of Boots or Shoes.
IPC: C14B5/00
Filed: 1918-08-20
Abstract: 131,441. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Aug. 20, 1918. Feeding an d registering webs. -Relates to cuttmg-out presses for heel lifts &c. of the type in which the work is intermittently fed by rollers and in which s u p p l ementary feed and work control devices are employed to eliminate waste in operating upon the ends of the material. The work is fed to the cutting die 2 by two pairs of grooved and corrugated feed rolls 50, 52, and 46, 48. The rolls 50, 52 are carried by brackets loosely engaging the rolls 46, 48 and means are provided for adjusting the roll 52 in a fixed position and for obtaining an adjustable resilent pressure of the roll 50 on the work. The rolls 46, 48 are supported in swinging arms 58, 60, Fig. 10, which are adapted to approach each other with an adjustable resilient pressure by spring-actuated toggle mechanism as shown. The pairs of feed rolls are geared together and driven intermittently by adjustable crank mechanism, operating through a clutch as described in Specification 5096/15, [Class 31 (i), Cutting and severing machines &c.], to vary the length of feed according to the size of cutting die in use. Means for controlling the initial feed of the material, to ensure that the work reaches such a position over the die that the first cutting operation may be effected with the minimum of waste, comprises a stop 182 which controls the entrance to the feed rolls 50, 52 and is vertically reciprocated from a cam 200, Fig. 3, through mechanism comprising a resilent connexion adapted to limit the downward movement of the stop when the work has been admitted thereunder. The position of the cam 200 on its driving shaft may be adjusted with the aid of a scale 224 graduated to show the correct adjustment corresponding to the particular die in use. The penultimate feeding step before the first cutting operation is preferably arranged to project the leading edge of the work slightly over the die to cause the latter to trim the advancing edge of the work. To ensure that the work is presented to the cutting die above its cutting edge, a guide plate 228 is provided which is pivoted at its front end and bears at its rear end on a resilently and adjustable raised stripper member 232. A presser foot 242 is adapted to bear with resilent and adjustable pressure on the work and is pivoted to the rear end of the stop 182 to enable the advancing work to raise the presser foot to pass thereunder. A lug 250 on a reciprocating cutting block carrier 34 serves to depress the presser foot and its coacting parts during a cutting operation to prevent an abrupt bending of the material close to the die. The return of the stripper plate 232 serves to remove the scrap from the die. Horizontally reciprocated pusher feed fingers 256 are provided for feeding the work to the cutting die after it leaves the feed rolls. A stop 290 on the carrier 34 engages the work and limits the amount of feed of the fingers 256, a resilent telescopic connexion being provided in the feed actuating mechanism to neutralise excess feed movement. The stop is retracted automatically during the descent of the carrier 34 to prevent fouling of the cutter and is adjustably mounted to allow for its use with different dies. The edge of the work is, on its way to the cutting die, trimmed by a pair of coacting shearing disks 140, 142 secured to the shafts of the feed rolls 46, 48. To permit of lateral adustment of these cutters, the feed rolls 46, 48 and their driving gears are splined on their respective shafts which are axially adjustable. To ensure regularity of feed past these cutters the feed rolls 50, 52 extend past the plane of action of the cutters which have corrugated peripheries to facilitate feeding of the work. A scale is provided to secure accurate adustment of the cutters and an adjustable lateral gauge 144 working over a scale 152 is provided for positioning the work initially in the machine. For the first passage through the machine of rough edged work, a supplementary gauge 308 is employed, the gauge 144, which is pivotally and resilently mounted, being swung out of its operative position by a hand-lever 318. Specification 20118/14, [Class 31 (i), Cutting and severing machines &c.], also is referred to.