Patent GB-191011490-A (GB)
Title: Automatic Design Cutting Machines.
Inventor: WEIS JOHN PETER
IPC: B26F1/38
Filed: 1910-05-09
Granted: 1911-05-09
Abstract: 11,490. Weis, J. P. May 9. Vertical-cutter type for cutting sheet material in direction of feed; rotary and oscillating type for cutting rectilinearly.-Relates to a machine for cutting-out designs from a web of tubular or other fabric bv means of endless-band knives while the fabric is being continuously fed. The band knives 60, 61, Figs. 5 and 7, pass over pulleys 44, 48, 56, carried by brackets 43, 47, 51, 52 secured to sliding plates 25, 29, and the knives are moved towards and from each other, across the direction of feed, by means which reciprocate the plates 25, 29. These means comprise a pattern roll 64 having cam grooves 65, 66, in which engage loosely-mounted rollers 82 on levers 67, 68, which are pivoted to the machine frame and are connected to the sliding plates 25, 29 by rods 72, 75. These are secured to the levers 67, 68 by a pin-and-slot connexion, and are adjustable in length to vary the travel of the plates 25, 29, and so vary the width of the design cut. The pattern roll may be replaced by others having grooves of different form. It is driven by means of a ratchet-wheel 86 and a spring pawl 89 carried by a swinging plate 121, Fig. 17, which is connected by a pitman 122 to a crank pin on a disk 123 on the shaft 38. The band knives may have a tapering cutting-edge 60, Fig. 26, or saw teeth. The tension of the knives is adjustable by screws 58, which adjust the slidable heads carrying the upper band-pulleys. The lower band-pulleys 44, 48 are supported in the brackets 43, 47 by a ball bearing shown in Fig. 21. A spring 126 presses a ball cup 127 containing balls 128 against the conical end of the band-pulley shaft 45. The pulleys are driven by friction disks 30. 31, which are carried by a shaft in two sections 15, 16 connected by a loose sleeve 17, which has keys 18 engaging grooves in the sections 15, 16. Stops 20 prevent the sections from sliding out of the sleeve 17. The speed of each band-pulley is thus independently adjustable by moving the shafts 15, 16, with their friction disks, longitudinally. This adjustment varies the length of the pattern cut. On leaving the machine, the fabric is cut across at intervals by an oscillating knife 97 carried by arms on a rock-shaft 98. The knife is operated by a finger 94 pivoted on a lever 90, which engages a depending arm 105 on the rock-shaft and is operated by a cam 96. The finger 94 is brought into operative position when a pin on the lever 90 enters a recess 85 in a ring 83 secured to the pattern roll 64. The ring 83 may be replaced by one having a different number of recesses 85. The knife 97 coacts with the edge of an adjustable plate, which can be reversed if one cutting edge becomes dull. The fabric 131 is led from a roll 129, between guide-plates 106 and loosely-mounted feed rolls 109, and is drawn through the machine by heavy tension-rollers 110, 111, of which 110 rests in open bearings, and 111 is driven by means of a ratchet-wheel 116<a>, Fig. 17, and a spring pawl 118 on a swinging plate 117 connected by a pitman 119 to a crank-pin on a disk 120 on the shaft 42. The rate of feed, and therefore the length of the design cut, may be regulated by changing the length of stroke of the crank-pin. In the case of tubular fabric, a block or spreader 132 is inserted between the folds, and a wire frame 133, pivoted on the block, is placed in grooves in the upper roller 109, Fig. 11. In the case of material of a single thickness and of different widths, guides may be used consisting of plates 139, Fig. 15, adjustable by means of screws 140, 141 along a rod 136 carried by a #-shaped plate 136<a> fitting over the bearings of the rollers 109.