Patent GB-680706-A (GB)
Title: Improvements in stamping apparatus
Inventor: BUTTERWORTH JAMES HARVEY
IPC: B41F1/26
Filed: 1948-12-22
Abstract: 680,706. Perforating-machines. TOOTAL BROADHURST LEE CO., Ltd. March 22, 1950. [Dec. 22, 1948] No. 27506/48. Class 31 (ii). [Also in Groups XVI and XL (b)] Apparatus for perforating a longitudinally displaceable web at intervals along its length, comprises a stamping head located on one side of the web and an anvil on the opposite side, and means for causing relative displacement of the stamping head and anvil to cause them to approach one another to perform a perforating operation on the web and then to withdraw, the head being mounted for angular displacement about a pivot spaced from the stamping head, so that the position of the head can be adjusted transversely of the path of web travel to enable it to follow transverse deviations of the web travel. A web of cloth 11, Fig. 1, passes from a supply roll to feed rollers 13a, 13b round a looping roller 14, round a guide roller 15, over a table 16, round a second guide roller 17, around a second looping roller 18 thence to feed rollers 19a, 19b. The lower rollers 13b, 19b are positively driven by a shaft 29 driven through a vertical shaft 28 by a variable speed motor 26 driving a shaft 27. The looping rollers 14 and 18 are connected by links 20 so as to form a longitudinally slidable carriage connected to rods 21 pivoted to the upper ends of oscillatable levers 22. The lower ends of the levers 22 carry bearing rolls 22a slidable in slots 23, while projections 22b on the levers ride in cam grooves 25b in cam wheels 25 mounted on a shaft 24 driven by the shaft 27. As the rollers 14 and 18 move to the right as shown in Fig. 1, the web fed by the rollers 13a, 13b will be absorbed by the increasing length of the loop of web around the roller 14 between the rollers 13b and 15, so as to bring the web temporarily to a standstill between the guide rolls 15 and 17, the length of the loop around the roller 18 correspondingly decreasing so that the rollers 19a, 19b continue feeding. The rollers 14 and 18 act oppositely on movement to the left so that the web moves at an increased speed between the guide rollers 15 and 17. A column 30, Fig. 3, is pivotally mounted at its lower end, the inclination of the column being adjusted by a rod 32. Brackets 30b are bolted to the column while side frame members 33a of a stamping head 33 are pivoted at 33b to the upper end of the brackets 30b. A vertical shaft 34 reciprocated by a follower 34a resiliently engaging a rotating cam is connected to an anvil 37 co-operating with a rotatable die-carrying drum 40. The anvil 37 carries a pair of pins 34c, Fig. 4, one of which engages a forked lever 47 pivoted at 47a while the other engages a forked lever 48 pivoted at 48b and coupled with a stop lever 48a. A locating lever 30c pivoted to one of the brackets 30b is urged downwardly by a spring 30d so as to co-operate with studs 40c on the drum 40. Upward movement of the shaft 34 turns levers 47 and 48a, Fig. 4, clockwise, whereby a pawl 50 carried on a rod 47b, pivotally connected to the lever 47, slides over ratchet teeth 40b, the lever 48a simultaneously moving out of the path of the studs 40c. The anvil presses the selvedge of the cloth 11 firmly against the drum 40 to operate on the selvedge of the cloth. The pressure between the anvil 37 and drum 40 can be adjusted prior to operation by a micrometer mechanism 38 which rotates depending extensions 33c of the frame members 33a. Downward movement of the shaft 34 turns the levers 47, 48a anti-clockwise, whereby a pawl 49a rotates the drum 40 through 60 degrees. Further movement of the drum is prevented at the end of the downward stroke of the shaft 34 by reason of the levers 30c and 48a which co-operate with studs 40c. A photo-electric head 51, Fig. 1, views the path of the adjacent selvedge of the cloth 11 so that deviations of the selvedge may be compensated for by transverse movement of the head 33. The photo-electric head controls the operation of a guide motor 52, Fig. 6, connected to an amplifier 54,. Fig. 1, and a control panel 56. The motor 52 drives a screw threaded shaft 58, Fig. 6, engaging a threaded member 32a carried by the rods 32, whereby rotation of the shaft causes horizontal displacement of the rods 32 to adjust the inclination of the column 30, Fig. 3, and thus the transverse position of the drum 40 and anvil 37 to follow the selvedge of the cloth 11. Alternatively, the motor 52 may be controlled through a suitable electrical control by a feeler engaging the edge of the cloth 11.