Patent GB-255112-A (GB)
Title: Improvements in and relating to machines for separating and feeding blanks
IPC: B65H1/18
Filed: 1926-07-12
Abstract: 255,112. Davidson Manufacturing Co., (Assignees of Davidson, W. W.). July 13, 1925, [Convention date]. Pile tables and supports for sheet feeds. - In apparatus for feeding flat blanks to a machine, the mechanism for raising the pile table C is controlled by the movement of a vertically-movable separator unit F comprising a separator roll 53 mounted on a horizontally-stationary axis and adapted to rest at all times on the top of the pile. The table is carried by chains 9 passing over sprocket wheel 10 on a shaft 11 and having counterweights 12 at their ends. An oscillated shaft 13 is connected by a clutch to the driving-gear of the machine, and is adapted to give a step-bystep rotation to the shaft 11 to raise the table C. through a ratchet disc 16, Fig. 5, pawll 19, and intermediate gearing, the ratchet extension being rendered inoperative when the table has been raised sufficiently. The pawl 19 is carried by an arm 20 freely mounted on the shaft 13, the arm 20 being pushed in one direction to rotate the disc 16 by an arm 31 connected to the shaft 13, and retracted by a link 39 connected at its other end to a lever E pivoted at 38 and pulled upwards by a spring 51. The upper surface of the lever E is formed with two cam surfaces 65, 66 adapted to be engaged by the lower end of a member 64 hanging from a pivot 71, the member 64 varying the upward movement of the lever E. the retractive movement of the pawl 19, and therefore the movement of the tables C according to which portion of the surface 66 it engages, and preventing upward movement of the lever E when it engages the surface 65. The position of the member 64 is controlled from the separator unit F, which, as it drops due to the feeding of the blanks, turns a shaft 56 having an arm carrying a pin 68. Fig. 5, engaging a cam surface 70 on the head 73 of the member 64. An extension 35 of the oscillating arm 31 carries a cam 34 which engages a roller 63 on the lever E so as to move the lever E just beyond the position in which the member 64 engages the surface 65, to permit free pivotal movement of the member 64. The parts of the lever E carrying the cams 65, 66 and roller 63 respectively are relatively adjustable. A retaining pawl 25 is provided to prevent reverse rotation of the ratchet disc 16, and if it isdesired to lower the table C, both this pawl and the pawl 19 are raised by means of a lever 83, Fig. 2, carrying a pivoted member 88 guided by a pin-and-slot 91 and having projections 89, 90 which engage pins 28, 23 on the pawls 25, 19 respectively. A handle is provided on the shaft 13 for turning the disc 16 and raising and lowering the table C manually, and if the handle is accide.ntally released when the pawls 19, 25 are raised, a spring-pressed pin on the handle comes into engagement with a projection 94 on the lever 83 and prevents further falling of the table. The pile table C comprises slides c, Fig. 1, having rollers 7 running in guides 8, and side brackets. 4 adjustable on cross-stays 1, 3 on the slides c. Two rods 54, 57 carry the separator unit F, the rod 54 being attached to arms 55 fixed to the shaft 56, and the rod 57 being free to move in vertical guides 58.