Patent GB-544788-A (GB)
Title: Improvements in or relating to web feeding mechanism
Filed: 1940-12-07
Abstract: 544,788. Feeding webs. REMINGTON RAND, Inc. Dec. 7, 1940, No. 17424. Convention date, Dec. 13, 1939. [Classes 100 (i) and 100 (iv)] Web-feeding mechanism, particularly for feeding a web intermittently over the platen of a statistical machine, comprises grippers mounted on a rotary drum and so controlled as to grip the web over an arc of the drum that is less than the arc of contact of the web and drum. The feed-mechanism shown in Figs. 3, 4, and 6 is mounted in brackets 24 above the platen 22 of a tabulating-machine, and serves to feed a web 52 to and from the platen. The mechanism comprises a pair of drums 60 secured to a shaft 28 and provided with radially movable pins 77 having rectangular heads 76 for clamping the side edges of the web to the drums. Normally, the long axes of the heads are at right-angles to the shaft 28 and the heads are out of engagement with the web, but on rotation of the pins through a right-angle, by means described below, the heads are caused to overlap the web. The side edges of the web are supported by the drums, and additional support at the sides and middle is provided by discs on the shaft. The web is guided by adjustable, channel-guides 55, and aprons 140, 141. The shaft 28 is operated intermittently, to impart a long feed to the web, by means of a camactuated ratchet-device which is geared to the platen and the shaft 28. The pins 77 are each provided with a gear 80 having four radial slots for co-operation with a roller 74 mounted in stationary brackets 75. Each gear is engaged on opposite sides by a pair of slides 81, 82 mounted on the drum and connected by a spring 89, the slide 82 being provided with a roller 92 co-operating with a stationary cam 78. The gears 80 are normally locked by co-operation with brackets 93 on the drum. The cam 78 is formed with concentric parts 99, 100, and humps 95, 96 and 97, 98 which are connected by flats 101, 102 and are adjacent to the rollers 74. When the pins 77 are travelling around the cam-parts 99 ... 102 they are out of contact therewith, and the springs 89 hold the heads 76 in contact with the drum. When however, any pin 77 rides over the hump 97, the pin is moved outwards, the associated gear 80 is released from the brackets 93 and is then turned through a right-angle by the adjacent roller 74. The pin is then moved inwards by the spring 89, the gear is locked, and the head 76 is held in clamping- engagement with the web, engagement being maintained until the pin rides over the hump 98. A similar action occurs when the pin rides over the humps 95, 96. The web contacts the drum over the arcs E-F, G-H, and gripping occurs over the arcs A-B, C-D. The drums 60 and associated parts are laterally adjustable to accommodate webs of different widths. In an alternative construction of feedmechanism, a pair of drums 110, Fig. 10, on the shaft 28 are provided with pivoted fingers 113 for gripping the side edges of the web. Each finger consists of a bail pivoted on a pin 116 on the drum and urged into contact with the drum by a spring 134. Another bail 125, pivoted on the pin 116, is connected by a link 123 to a bell-crank 118 having a roller 120 for co-operating with stationary camsurfaces 112. When the upper cam-surface engages the roller, the finger grips the web, but when the lower cam-surface engages the roller, the toggle constituted by the members 123, 125 is straightened, and the finger is raised by co-operation of lugs 130 thereon with the pivotal connection 126 of the members. Specification 448,485 is referred to.