GB1049946A - Improvements in cutting machines for cutting fabric or the like into bands - Google Patents

Abstract

1,049,946. Slitting apparatus. S. G. ANDERSSON. Jan. 29, 1964 [Jan. 29, 1963], No. 3881/64. Heading B4B. A machine for longitudinally cutting fabric or the like into bands comprises knives 1, Fig. 5, adjustable transversely of the cutting direction, which are mounted with equal spacing on the links of a lazy-tongs mechanism 18, Fig. 4 (not shown), by means of which the spacings between the knives are adjusted while maintaining the equality of spacing. As described, each knife device 1 comprises a disc 2, Fig. 3 (not shown), clamped between cheeks 3, 4 and mounted in ball bearings, suspended by pivoted arms 7, 8 in a carrier 10 connected to a slider 11 displaceably mounted on a guide beam 12. Each carrier 10 has a vertical slot in which a spring 14 presses down on a sliding block 15 comprising a pivot 9. The spring operates to press the edge of a respective knife against two counter rolls 16, 17. The guide beam 12 may be of U-section housing the lazy-tongs 18, whose links are divided into sets of groups of six, with a free link at each end connected by a pin with a slider 11, which may be positively adjusted by one of parallel screws 19, 20, Fig. 5. Each screw-operated slider has a lug 24 on its top surface with a screw-threaded hole working as a nut on its respective screw. In the middle of the assembly is a member 11a fixed to the beam 12 with bearings for plain mid-length portions of the screws 19, 20, and means to prevent axial movement of the screws. The screws are geared together by gears 21, 22 operated by a hand wheel, and provided with series of threads of differing pitch and diameter, to permit control of different sets of knives. All the knives 1 can be moved into non- operative position out of engagement with the counter rolls 16, 17, for infeeding material, by operation of a hand lever 43 and a pivoted lever arrangement 33, 38, 39. Individual knives may be lifted into non-operative position by being turned about a bolt 9. The pressure of the knives against the counter rolls is adjusted by a screw 35 which varies the tilt of the beam 12 when screwed upwards. In a modification to permit adjustment of the spacing of the knives while maintaining uniform spacing, the screw arrangement is divided into halves 141, 142, Fig. 6 (not shown), held together by a ring 143, which permits relative rotation. The screw half 141 has a bore 144, through which a shaft 145 extends, having an adjusting wheel 146 at one end and a transverse key or wedge 147 at the other actuated by a spring 148 and engaged in a slot 149 in the screw half 142. The screw halves are normally in non-rotative connection with one another. When the key 147 is moved out of engagement with the slot the halves can be turned independently. In further modifications one or more screws may be used, and the knives may be other than discs and non-rotary.