Machine for automatically cutting strips of adjustable length from a sheet or roll

摘要

1,005,016. Cutting webs. ANSTALT BREVETEX. Nov. 7, 1962 [May 4, 1962], No. 42042/62. Heading B4B. A machine for automatically cutting strips of adjustable length and width from a sheet which may be drawn from a roll comprises a pair of reciprocating guillotine blades 1, 2, Fig. 1, having their cutting-edges oppositely disposed and arranged obliquely with respect to the plane of the sheet to be cut, a device to correctly position the sheet at the start of cutting operations and operable in synchronism with the cutting stroke of the blades, pairs of vertically adjustable feed rollers 32, 321, 33, 331 and 34, 341, Fig. 1, adjustable longitudinally-slitting discs 38, 39, adjustable scoring- means 37, an intermittent feedmeans to stop the sheet before cutting takes place including brakes for the rollers 321, 341, and means to render the slitting-discs operative or inoperative. In operation, entrance of the sheet 71, Fig. 4, to the machine is impeded by a stop 70 until it is released by the action of a cam 76, driven by the main shaft 11, a cooperating follower 79 and a system of levers 72 ... 75. The stop is held engaged by operation of a pedal 77 acting through a flexible cable 78 until the moment when the projection 761 strikes the follower. When the stop is released, the sheet is fed by the rollers into the machine and is scored by the wheel 37, and may be longitudinally slit by the cutters 38, 39 carried by the rollers 36, 361. The blades 1, 2 are respectively driven by shafts actuated by connecting rods having eccentrics driven by the main shaft 11 and a first motor 12. At one end of the shaft 11 is secured a disc 15, Fig. 6, bearing an adjustable eccentric pivot 19 co-operating via an elastic or resilient tearpreventing member 26 and a chain 17 with a ratchet. A second motor 50 drives the cutting- disc shafts 36, 361 via a belt and a pulley 49, Fig. 3, the intermittent feed being excluded by operation of a lever 40 actuating a pin 46 which is withdrawn from a hole 47 to release a cylinder 31 from a gear 801 mounted on the cutting roller 361. Similar operation of a further pin 48 by reverse movement of the lever 40 will exclude continuous feed and include intermittent feed. The upper of each of the three pairs of driving rollers is adjustable upwards, to accommodate different thicknesses of sheet, by a handwheel 55, Fig. 1, operating, through a screw drive, the levers 56 ... 58 acting on slides 59 ... 61 for the upper rollers. The rollers are detachable by removing cams 52, Fig. 3, and pins from the roller support frame 54. To facilitate stopping the feed of sheet material at the correct cutting point the intermittent-feed device includes a pair of adjustable brakes controlled by a cam 62, Fig. 5 (not shown), fixed to the main shaft 11 and a co-operating follower which acts progressively on the shoes of the brakes to tighten these around pulleys which are co-axial with the feed rollers 321, 341.