Patent GB-480000-A (GB)
Title: Improvements in machines for cutting paper, or like material, having means for advancing the material step by step
IPC: B26D7/01
Filed: 1936-05-16
Abstract: 480,000. Cutting-machines for paper &c. HARRIS - SEYBOLD - POTTER CO. May 16, 1936, No. 13946. Convention date, May 28, 1935. [Class 31 (i)] [Also in Group XXIV] In a machine for cutting paper or like material in which the work is fed stepby-step by a feed member moved partly at high and partly at low speed, the feed member is set to operate at both high and low speeds by electrical means and is automatically stopped when the electrical means are deenergized. In the guillotine machine shown, which somewhat resembles that described in Specification 411,884, the feed member may also be controlled by manual means operating directly or through the electrical means. The feed member or back gauge 26, Fig. 1, is moved over the work table 25 by a screw 27 which is driven from a main shaft 117 through a changespeed device. The shaft 117 drives a shaft 123, Fig. 3, through a friction drive, and a bevel gear 129 meshes with bevel gears 130, 131 to turn them in opposite directions on a shaft 114. A worm wheel 137 also rotatable on the shaft 114 is turned at a slower rate by a worm 136 driven from the shaft 123 by sprockets 132, 134 ; the screw 27 is driven from the shaft 114 by pulleys 111, 113. Clutch sleeves 138, 139 on the shaft 114 co-operate with the bevel gears 131, 130 and the worm wheel 137 to drive the shaft in reverse, and forwards at a high and low speed respectively. The reverse clutch sleeve 139 is engaged by manually moving a rod 145 to the left against a spring 156, thereby rocking a lever 147 about a fixed pivot 146. The forward clutch sleeve 138 is operated by yoke arms 141, Fig. 1, of a lever 142 which is normally held in the neutral position shown by adjustable springs 166, 167 co-operating with depending rods 168, 169 and by a plunger 175 engaging a notch 177 in an arm 178. The clutch 138 is moved to high or low speed position by rocking the lever 142 either electrically by solenoids H, L, Fig. 4, whose armatures are coupled to the lever by links 165, or manually by rocking the rod 145 which operates through a crank arm 144 coupled by a link 143 to the lever. A pin 163 on the rod 145 co-operates with a slot in a sleeve 161 to prevent the rod being slidden to engage the reverse clutch while the forward clutch is operating. A roller 157 on a.n arm 158 of the rod co-operates with inclined surfaces on the back gauge 26 to rock the rod to normal position and stop the forward movement of the back gauge at a predetermined point. Rearward movement of the back gauge is limited by an incline 152 on the back gauge engaging an arm 151 of the lever 147 to rock it. Movement of the rod 145 to the left opens a switch 188 to prevent electrical engagement of the forward clutch sleeve while the reverse clutch sleeve is engaged manually. The back gauge 26 is connected by a cable 33, Fig. 7, to a sliding carriage 32 which co-operates with stops adjustably secured to a rectangular or other bar 56 to determine the steps which the back gauge moves on its forward travel when controlled automatically. Each main stop 63 carries an insulated roller 66 which co-operates with two contacts 86, 87 on a bell-crank lever 78. An auxiliary stop 72, Fig. 10, may be mounted on the main stop 63 and has a roller 76 to co-operate with two contacts 88, 89 on a bell-crank lever 79. The back gauge is normally started at high speed by moving a wobble stick 197, Fig. 14, to the left to close a switch 201 and to energize the solenoid H ; the wobble stick is released and the back gauge travels at high speed until an angular finger 69 on the first stop 63 operates to open a switch 107, Fig. 21, when the back gauge drops automatically to low speed and finally stops when the roller 66 bridges the contacts 86, 87 to close a circuit through a coil A. The knife is then operated and just before it has completely risen a switch 183 is closed by a cam on its driving shaft, and the back gauge is restarted at high speed and continues as before to the next main stop 63. If, however, the main stop carries an auxiliary stop, the back gauge is restarted at low speed owing to the bell-crank 79 having been rocked by the roller 76 engaging the contact 88 so as to break contacts 101, 101<1> and complete contacts 100, 100<1> by operation of a switch 85; the back gauge stops when the roller 76 engages both contacts 88, 89. By holding the wobble stick 197 in its left, right or lower position to operate switches 201, 204 or 209, the back gauge is caused to travel at high or low speed or to stop independently of the stops 63, 72. The four faces of the bar 56 may all be similarly grooved so that four arrangements of stops may be set up at one time, the bar being held in each position by a latch 61. An arm 52 on the carriage 32 carries a pointer 53 co-operating with a scale 54 for setting purposes, a lamp 98 lighting up when a roller 66 is moved to engage both contacts 86, 87.