Patent GB-190320073-A (GB)
Title: Tension Gear to be Released by the Edges of the Sheets in Feeding Apparatus for Rapid Printing Presses, Folding Machines and such like.
Inventor: ROSENFELD ARTHUR
Filed: 1903-09-17
Granted: 1904-08-18
Abstract: 20,073. Rosenfeld, A. Sept. 17. Feeding sheets.-Relates to apparatus released by the front edge of the sheet as it is fed forward, for operating to stop the friction feeding- mechanism or to perform any other required function when the sheet has reached a predetermined position. One or more pairs of togglelinks are inserted in the apparatus, the toggles being held or set nearly in line until released by the sheet &c., when the spring or tensioning.device is permitted to act. Release is thus rendered easy, and may be effected by thin paper. Fig. 1 shows an apparatus having one pair of toggles 10, the lower link being pivoted at a fixed point 11, and the upper link to the arm 12 of a bell-crank lever 12, 14 pulled by the spring 15. The links 10 are set nearly in line, as shown, and are held in this position by a bent pawl 8 pivoted to the joint 9 of the links. This pawl 8 engages a stud 7 on an arm 6 fixed on a shaft 2 mounted in ball bearings. On the shaft 2 is also fixed the releasing-arm 3, which extends down and is bent at right-angles under the feed-table 4. The edge of the sheet 17 is prevented from bending by the usual plates 5, and its front edge operates the arm 3 and the arm 6 to release the pawl 8 and toggles 10, whereupon the spring 15 operates the lever 12, 14 to perform the required function. The arm 3 is swung up to clear the sheet, while the latter passes to the machine, and the toggles &c. are re-set by a loose sleeve 18 on the shaft 2 operated by a rod 20 from a suitable moving part of the machine. On the sleeve 18 are arms 23, 24 which engage and move the arm 6, but they are sufficiently far apart to permit of the movement of the arm 6 to release the pawl 8. The sleeve is first rocked to press the arm 6 downwards and swing the arm 3 up, an arm 21 and roller 22 on the sleeve lifting the arm 12 and nearly setting the toggles. The angle of the pawl 8 at the same time engages over the lug 7, and, when the sleeve 18 is rocked back, the arm 6 and pawl 8 complete the setting of the toggles. At the end of this return movement, a lug 25 on the arm 24 lifts the pawl 8, so that it only engages the lug 7 sufficiently to hold the toggle, and to permit of easy release. As a modification, the lug 7 may be replaced by a pin connected by a rod to the joint 9 of the toggle, the arm 6 being in the vertical position when the toggles &c. are set. In place of the toggle links shown in Fig. 1, those shown in Fig. 6 may be employed. The togglelinks 30, 31 are pivoted together at their upper ends 33, the link 30 being pivoted to the fixed point 32, and the link 31 to the spring-operated lever 36. The toggles are held and released by the pawl 40, the movement of the toggles being limited by the fixed stop 43. Several pairs of toggle-links may be used in the same apparatus, released in succession, or one pair releasing the next. Fig. 7 shows such an arrangement having two pairs of toggles 45, 46, 47, 48 released by the sheet 51 and lever 50 to permit the spring 52 to operate the lever 53. The main toggles 45, 46 are held in the set position by the toggles 47, 48, and the latter are held by the pawl 50.