| 摘要 |
<p>960,688. Shearing. F. J. SEHN. April 19, 1960 [April 16, 1959], No. 13692/60. Heading B3W. Apparatus for pulling sheet material through a shears 68, 69 comprises parallel, spaced belts 40 supported on pulleys on a drive shaft 30 at the discharge end of the apparatus and on pulleys 42 at the receiving end of the apparatus, the pulleys 42 being capable of limited vertical movement. Grooved guide-bars 58 supporting the upper strands of the belts, rest at one end on spring-pressed slides 44 carrying the pulleys 42 and at the other on a bar 60. The sheet is pressed against the belts by rolls 80 carried by bars 70 which are mounted resiliently beneath cross-members 73. These are mounted between parallel links 74, 75 operated by cylinders 76. A number of stock-stops 89, arranged along the width of the sheet, are mounted on a beam 91 adjustable by a hand wheel 102 operating a pinion engaging a rack 99. The stops are slidable vertically on the beam 91 and can be lowered by a cylinder 104, Fig. 7, connected by links 110 to stop-slides 90. The shaft 30 is driven through a chain and a variable-speed reduction unit 36 by a motor 35. A control circuit, Fig. 9 (not shown), is described which includes switches LS-1, LS-2, the operation being such that when the sheet operates contact LS-1, the roll assembly 70, 80 is raised slightly, permitting the sheet to be gradually advanced against all of the stops 89. The shears is then operated and upon a switch on the sheaves being closed, the roll assembly 70, 80 is again lowered. The stops 89 also are lowered, permitting discharge of the severed sheet.</p> |
