Patent GB-190017899-A (GB)
Title: Improvements in Sheet Calipering and Throw-out Mechanism for Paper Feeding, Folding and like Machines.
Inventor: DEXTER TALBOT CHAMBERS
Filed: 1900-10-09
Granted: 1901-05-04
Abstract: 17,899. Dexter, T. C. Oct. 9 Feeding sheets ; stopping and starting apparatus; folding paper. -Relates to sheet callipering and throw-out mechanism for sheet feeding, printing, folding, ruling, &c. machines, for stopping the machine when two sheets, or folded sheets, or sheets of abnormal thickness, are fed or passed through the machine, and for stopping the machine when no sheet is fed, or when the sheet is fed unevenly, &c. Fig. 1 shows a sectional elevation of parts of a feeding and folding machine, in which the sheets are fed from a pile P on a table automatically raised, in a usual manner, as the pile decreases in height. The sheets advanced by the feeding-fingers are fed-off by rollers, on to which drop-rollers descend at the proper times. The lower rotary member 25 of the callipering- device is so placed that the sheets pass over it, between it and the upper rotary member 27. The member 27 is journalled on an arm 28. pivoted at 29, and provided with an adjustable stop-screw 31 engaging a fixed lug 33 to limit the downward movement of the member 27. A spring 30 presses the arm down. The arm 28 is so adjusted that one sheet can pass freely between the members 25, 27, but, if two sheets are fed, the members are rotated, and a pin 35 on the member 27 engages and moves an arm 36, pivoted at 20, and forming part of a long lever 19. Lugs 40, 41 limit the movement of the lever, which is drawn by a spring 42 so as normally to engage under the nose 16<a> of an arm 16 fixed on a shaft 17, and having a roller 18 engaging a cam 15 on the main shaft 10 of the machine. When the lever 19 is moved by the rotation of the member 27, it frees the arm 16, which descends when the depression of the cam comes under the roller 18, and the arm 17 is rocked and operates a clutch to stop the shaft 10. The sheet passes on to the strips 52 for folding through the slot 54 into rollers 50, 51. The sheet lifts a finger 57 if it is properly moved up to the stops 53. The finger 57 is pivoted at 58 on a bracket 55, and has an arm 58<a> adapted to engage the arm 63 of a lever 60, pivoted at 62, and connected by a rod 66 to an arm 68 loose on the shaft 17. When a sheet fails to reach and raise the finger 57, the arm 60 is drawn by a spring so that a lug 71 on the rod 66 engages the lever 19 to free the arm 16. This movement of the arm 60 and rod 66 is permitted by a depression in a cam 70 engaging a roller 69 on the arm 68. The clutch operated by the arm 16 and shaft 17 may be of a suitable form, the one described being the same as that described in Specification No. 11,249, A.D. 1900. A sheet.detecting device is preferably used in combination with the finger 57 and the mechanism operated by it. The sheet-detecting mechanism arrests the operation of the sheet-feeding mechanism when a sheet is not fed squarely, or when a corner of the sheet is folded &c. It comprises two fingers engaged and lifted by the front edge of the sheet. If either of these fingers is not lifted, it prevents the descent of the drop feed rollers, and also operates to stop the movement of the corresponding feeding-carriage and fingers.