Patent GB-152517-A (GB)
Title: Improvements in automatic feeding devices for presses, punching machines and the like
IPC: B21D28/08
Filed: 1919-10-15
Abstract: 152,517. Stubgen, R. Oct. 15, 1919. Punching; metal-sheet feeds.-In quincunx feeds for metal punching, stamping, and like machines, the work-carrier is moved intermittently, in either direction longitudinally, through distances equal to or less than the required pitch by gearing controlled by one or more intermittently rotated cams. The work-carrier 1 slides on a guide 3 to which is attached a removable pitch bar 8 to coact with an arresting-device 7, and is moved by a pinion 6 feathered on the shaft 5 which is intermittently rotated, to advance the work through a full or half pitch in either direction, according to the position of the double clutches 22, 25, by means of friction gears 20, 21, 23, 24, ratchet gear 18, and a crank 15 on the main shaft 14, which crank is adjustable to vary the pitch. The clutches 22, 25 are controlled by a cam 28, which is loose on the shaft 29 driven at one-quarter the speed of the shaft 14, but which is clutched thereto for half a revolution bv means of a spring bolt 32, normally held out of action by one of the pawls 33, 34, but released when this pawl is withdrawn by the work or carrier 1 striking the device 12 or 13. When the cam 28 is at rest, it holds the clutches 25 in engagement with the wheel 23 to ensure full advances, the direction being reversed after each half revolution of the cam. While the cam 28 is rotating it moves the clutch 25 to engage the wheel 24 to give half speed during one feed, the actuating-lever 25b also closing a clutch 43 to rotate the screws 11 through gearing 40, 10 to give the necessary transverse feed from f<1> to g<1>, Fig. 2. The reversal of direction takes place after the half pitch feed at both ends when there are an equal number of operating positions a<1>, b<1> ... in each row, but when alternate rows have even and odd numbers as in Fig. 2, a switch in the cam is moved to bring the alternate path 26<b> into operation so that at one end the reversal of direction takes place before the half feed as shown at n<1> to o<1>, Fig. 2. 'When it reaches the final position, the work or workcarrier strikes a lever 47 which stops the machine and drops a catch 48 to hold the clutch 43 in the open position so that the screws 11 can be rapidly reversed to bring the carrier into its initial position. In a modification the clutch 25 and disks 23, 24 may be replaced by a single disk moved axially by the lever 25<b>. In another modification. the four longitudinal feed movements are given by means of disks 50, 51, Fig. 5, secured on the shaft 5 and engaged by one of the friction ratchets 52, 53, 54, 55 reciprocated bv the crank 15, the other three ratchets being held out of action by catches as 53b. These catches are normally held in action by springs (not shown), and are withdrawn one at a time to release the corresponding pawl by Bowden wires 52<c>, 53<c>.., levers 52d .. , and pins 52<e> .. , one of which is pressed down by a roller 57 on a lever 58 actuated by a cam 59. This cam has a switch 59<b >and alternate path 59<a> and is driven from the shaft 29 like the cam 28. The cross-feed is actuated when either of the levers 54d, 55<d> for the half-speed feeds is operated, by a lever 63 connected thereto.