Patent GB-190503491-A (GB)
Title: Improvements in Automatic Web-feed Mechanism for Platen Printing Presses.
Inventor: WILLIAMS GIDEON GLENN
Filed: 1905-02-20
Granted: 1905-06-01
Abstract: 3491. Williams, G. G., and Williams, F. M. Feb. 20. Platen presses; feeding - apparatus for webs; cutting-apparatus.-Relates to means, which may be applied to existing platen machines of certain types, for feeding a continuous web and, after printing, for severing the required lengths and allowing them to fall into a delivery tray. The platen 1, Fig. 1, is provided with brackets 2, from which hangs a frame 4, retained in a vertical position by a weight 9 and carrying a roller 6. Secured by bolts in a horizontal slot in the frame 4 are two bars 10, connected at the upper ends by a cord 11, from which is suspended a sheet 12 of cardboard hanging in front of the platen. To. the frame 15 of the press is secured a frame 16, provided with an upward extension 17 and supporting the reel spindle 123. A transverse shaft 36 is supported in bearings in the upward extension 17 of the frame 16, and carries at each end a bell-crank 39, the longer arm 40 of which is slotted, and the shorter 42 connected by a bar 46 with a pin 48 on the side of the platen 1. Adjustably connected to the longer arm 40 of each bell-crank 39 is a connecting-rod 52, which is connected at its other end with a web-feeding appliance, Fig. 4, sliding in horizontal grooves 28 in the frame 16. The feeding appliance or gripper comprises a lower bar 61, the ends of which slide in the slots 28, carrying a second bar 65 secured by means of studs 67 encircled by helical springs 69. The heads of these studs bear against cams or eccentrics 76, prevented from rotating on oscillating shafts 71 by sliding feathers 74. The bar 61 carries two pairs of riders 70 which bear upon concentric hubs 75 on each side of the eccentric 76, causing the latter to move along the shafts 71 with the reciprocating feeder. The shafts 71 are connected by cranks 86 and a connecting-rod 88 so that they always move together, and are operated by means of a cam 94 on the machine shaft and a rack-bar 78 which engages a pinion on one of the shafts 71. These shafts are normally held in position by a spring. Near the outer extremity of the slots 28 is a stationary gripper, similar in construction to the reciprocating gripper described, secured to the frame 16 by champs 111. The upper member of the stationary gripper is operated by cams or eccentrics 108, which are capable of being moved longitudinally on their shafts 71, and are set so that the motion of the gripper bar is opposite to that of the corresponding member of the reciprocating gripper. The stationary gripper carries a series of bars 109 passing through apertures 110 in the reciprocating gripper 62. A cutting-blade 127 is pivoted to the lower member of the stationary gripper, and is normally held in its raised position by a spring 128 secured to a block supported by.the end of the same member, and engaging beneath a yoke on the back of the blade. The blade is operated by a cord 131, passing over pulleys 117, 118 and attached to a pin on the cam 94. The web is drawn by the feeder 62 from the reel, over the roller 32, over the platen, round rollers 6, 13<a>, in front of the cardboard sheet to receive an impression, over a roller, and finally between the jaws of the stationary gripper, where it is severed and the printed portion delivered to a board 135. The stationary gripper is closed during the return stroke of the feeder. Both grippers may be adjusted to produce sheets of different lengths. The movable member of both grippers may be faced with emery or other rough material.