Patent GB-538205-A (GB)
Title: Improvements in apparatus for making metal binding strips for cases
IPC: B21D43/09
Filed: 1940-02-08
Abstract: 538,205. Making binding strips for cases. KAMPER, A. M., and NO-NAIL CASES PROPRIETARY, Ltd. Feb. 8, 1940, No. 2465. [Classes 83 (ii) and 83 (iv)] Angular bending; shearing ; punching :-In an apparatus for making angle-section metal binding strips for packing cases in which a continuous strip is provided with one or more mitre notches at each pressing cycle, the strip is fed step by step through the press in lengths, a number of lengths forming a finished binding strip, the feed being effected by rolls controlled by a detector which engages an incision formed by the press in the strip at each cycle so as to locate the strip and initiate the operation of means for disabling the feed rolls and causing the press to execute one cycle, means being provided which operate in response to the completion of this pressing cycle to disengage the detector and restore the feed rolls to operative condition. The press consists of two similar parts placed back to back so that the two binding strips for each case may be formed simultaneously. The strips which are previously formed with strengthening grooves 220, Fig. 14, are each fed through two notching heads 167, 168 and a flanging head 169, these heads being formed as dovetailed slides so as to be longitudinally adjustable. The upper tools are stationary and the lower are adjustably carried by a beam 33 reciprocated by eccentrics on shafts 23 geared together and driven from a shaft 153 connected by gearing 154, 156, Fig. 15, to a shaft 157, which is connected by a clutch C2 to a driving shaft 158. The clutch, which is of the type described in Specification 470,257, [Group VII], and has a projecting arm 159, is controlled by a lever 160 connected to a lever 161 which is pressed by a spring 164 into contact with a cam 155 on the shaft 153. The lever 161 is operated in the other direction by a solenoid S4. The heads 167 are provided with tools for forming notches 208, 2081 &c. and the heads 168 with tools 174, Fig. 11, for forming notches 178, 178<SP>1</SP> &c. and with notches 175 for forming apertures 179, 179<SP>1</SP> &c. for co-operation with detector levers 83, Fig. 8. The heads 168 are also provided with punches 180 which are brought into operative position during alternate strokes of the press so as to form notches 196, 196<SP>11</SP> &c. The punches 180 are brought into position by forked members 182 slidable in grooves in the punches, and provided with inclined keys 185 sliding in inclined keyways 186 in the punch holder so as to bring the punches into operative position. The forked members are operated by levers and links 190-193, Fig. 3, from a solenoid S5, and the punch holder has a spring pressed stopper plate 187. The reciprocating flanging tools 198, Fig. 14, carry spring pressed clamps 199 and the fixed tools contain spring retracted interlocking plungers 200 which engage apertures 179n in the strip prior to the piercing operations these plungers being pushed down by solenoid S6 through levers. The solenoid S5 and S6 are adjustable on ribs 257 extending from the main frames. The feeding is effected by pairs of rolls 61, 66, mounted in a carriage 50 which is adjustable by a screw 57 on a base 51. The rolls 61 are carried by bearings 63, Fig. 7, normally pressed down by springs 65 so as to co-operate with the rolls 66 which are mounted on half shafts 67 connected by differential gear 69, 70 and driven by belts 72, 151 from a driving pulley 115. The rolls 61 are raised out of contact with the'strip by pins 78 on levers 77 pivoted at 79 and operated by a solenoid S1 controlled by the detectors 83 engaging the apertures 179 &c. cut in the strip by the tools in leads 168. The detectors are mounted on a shaft 84 and connected by lost motion devices such as recesses to a collar 85 keyed on the shaft and provided on each side with a tooth engaging the recesses. The vanes on the detector carry arms 89 which are presed down by springs 92 and provided with contacts 101, 102 controlling the solenoid S1. To the lever 77 is connected a link 134 which through a rod 135 and pawl 139 feeds a ratchet wheel 140 on a shaft 137. The shaft also carries a cam wheel 141 having alternate deep and shallow teeth engaging a spring pressed lever 142, the rear end of which thus closes either one or the other of a pair of switches 146, 147. The feed roll carriage is also provided with parting punches 103 which are operated by eccentrics on a shaft 111 which is connected by a clutch to the driving pulley 115. The driven member of the clutch is connected to the driving member by a semi-circular portion of a pin engaging a keyway in the driving member having a spring-controlled projecting arm normally engaged by a lever 132 so as to hold the clutch out of action. The lever 132 is moved out of the way every alternate stroke of the press by a solenoid S3. The parting tools form tongues 222 on the ends of the strip to engage the apertures 179 on the other ends thereof. Assuming that the press has completed a cycle and that the contacts 146 are closed, the feed rolls 61 in operation, and the detectors in engagement with the strips, if, due to difference in the resistance to the feed of the two strips, one is in advance of the other when the detector engages the apertures in the leading strip the contacts 101, 102 therefor close and the respective rolls stop feeding due to the differential gear. When the aperture in the lagging strip is engaged by its detector its contacts 101, 102 are also closed whereupon the solenoid Sl is energized so that the feed rolls are raised. Current passes also through contacts 146 and conductor 215 to operate solenoid S4 to trip the clutch C2, so that the main press cuts notches 2081 and 1781, Fig. 1B, and apertures 1791 and the length of strip between notches 208<SP>11</SP> and and 208<SP>111</SP> is flanged. Before completion of the cycle a projection 221 on the cam 150 momentarily rocks lever 161 to close contacts 165, 166 which energizes solenoid 52 to raise the detector lever 83 and open contacts 101, 102. The detectors are kept raised as the return of the solenoid plungers is delayed by a dash pot. Opening of contacts 101, 102 de-energizes solenoids S1 and S4 and clutch C2 is tripped, the main press stopped and feed rolls descend to re-engage the strips and pawl 139 feeds ratchet wheel 140 so that contacts 147 are closed and 146 opened. When feed starts again the dash pot allows detectors,to be returned by a spring .to engage the strips again. When detector levers 83 engage apertures 179<SP>11</SP>, Fig. 1C, current passes through conductor 214 and contacts 147 to solenoid S6 to operate the interlocking bolts 200 which register with apertures 179<SP>1</SP> and descend far enough to allow contacts 207 to close. Current flows from conductor 217 to energize solenoids S3, S4, S5. Solenoid S5 operates forks 182 so that punches 180 are operative and solenoid S4 engages clutch C2 so that the main press forms notches 208, 178 and 196, Fig. 1C, and aperture 179 and the strip is flanged between the notches 208<SP>1</SP> and 208<SP>11</SP>. At the same times solenoid S2 causes engagement of clutch to operate parting punches 103 to sever the strip and form the tongues 222 just before the main press and parting press complete their cycle contacts 165, 166 close to energize solenoid S2 to raise detectors and open contacts 101, 102 and solenoids S1, S6, S3. S4, S5 are de-energized, the pawl 139 advances the wheels 140, 141 one tooth to open contacts 147 and close contacts 146. In the case of any cumulative error causing the length of the portion of the strip between notch 208 and next notch 178 to be increased or reduced, the contacts 207 are not closed by the interlocking bolts 200 and the machine stops. Specification 538,204, [Group XVII], also is referred to.