Patent GB-228815-A (GB)
Title: Machines for feeding separate sheets to a printing press or other like machine
IPC: B65H3/06
Filed: 1923-11-06
Abstract: 228,815. Marks, E. C. R., (Swan & Co., Inc., G. R.). Nov. 6, 1923. Tripping-arrangements. - In a sheet-feeding device for printing and like machines constructed with sheet-feed tables and reciprocating gripper devices for forwarding sheets to front stops as described in Specifications 228,618 and 228,816, [both in Class 100 (i), Feeding and delivering webs &c.], the means for separating the sheets from the feathered bank comprises two similar sets of combing-rollers 47 which are in duplicate and are controlled in a similar manner by spring-pressed toggle mechanism, and raised by sheet-controlled means. The spring of the toggle mechanism causes the rolls to press on the bank when the toggle is broken in the downward direction, and raises the rolls with an accelerating motion when the toggle is broken in the reverse direction. Each combing-roller 47 is mounted in an arm 48 pivoted about a constantly-driven shaft 49 geared to the rollers 47. The arms 48 are connected by links 57 to projections on freely-mounted sleeves 56 on which are arms 60 pivoted to spring-controlled toggle arms 61 passing through guides 62, the toggles being shown in Fig. 15 as broken in the downward direction, and the rollers 47 being in position to act on the sheet. The separated sheet is forwarded by the rollers 47 under a guide 98 and over a grid-like support 97 which raises the front edge of the sheet to facilitate the action of the grippers, and the sheet is arrested by trip fingers 93 suspended from a shaft 89 fitted with a catch 87 which normally holds a latch lever 81 as shown in Fig. 15. When the lever 81 is released, it moves clockwise and permits a spring- pressed pawl 68 on an arm 67 integral with sleeve 56 to engage a constantly-driven ratchet wheel 69. A cam surface 79 on lever 81 normally prevents such engagements. The arm 67 and sleeve 56 are thus moved clockwise and the toggle 60, 61 is thus moved past its central position and the roller 47 raised, and held raised, by the adjustable spring 65. The pawl 68 is subsequently tripped by the action of a raised part 101 of the cam 79 on a roller 78 on the pawl arm, and the lever 81 is returned to the position shown in Fig. 15 by a cam 84, Fig. 17, driven independentlv. The latch 87 is moved counterclockwise to permit return of lever 81 by a cam arm 102, Fig. 13, mounted on the sleeve 56 and connected by a link 104 to a lever 103 controlled bv a cam 107. As shown in Fig. 13, a roller 108 on an arm 109 on the shaft 89 of the catch 87 is acted on bv the cam 102 to keep the latch 87 depressed against the action of a spring 115. When the raised part 113 on the inside of cam 107 acts on the roller 106, the cam arm 102 and the sleeve 56 are moved counterclockwise and the latch 87 is restored by the spring 115 and again holds the lever 81, the feeler 93 moving from the dotted to full-line position in Fig. 10. The movement of the sleeve 56 moves the toggles 60, 61 past the central position, and the spring 65 then depresses the roller 47 on to the back to forward another sheet.