Patent GB-280528-A (GB)
Title: Improvements in or relating to the formation of boxes
IPC: B31B15/00
Filed: 1927-11-01
Abstract: 280,528. Stokes & Smith Co., (Assignees of Stokes, J. S.). Nov. 10, 1926, [Convention date]. Feeding articles from stacks by pusher devices engaging the edges thereof.-In a machine for making and covering boxes by applying an wrapping station, the wrappers to a plurality of separate box-forming components while the latter are held in position at a covering or wrapping station, the wrappers are delivered to gripper units mounted on the chains of a conveyer unit C as described in Specification 254,684, the intermittinglymoving chains 126, Figs. 3 and 9, of the conveying unit C being driven by the forked ends of plungers 170 carried by reciprocating bars 163 actuated from a cam 148 geared to the wrapping machine W; the plungers are slidably mounted in carriers 169 on the bars 163 and each carry a roller 171 engaged by one arm of a bell-crank lever 178 mounted in the conveyer housing 121; these arms of the lever are biassed by springs 175 to hold the plungers from engagement with the chains while the other arms carry rollers in engagement with cams 176 on the shafts 147 which rotate once for each cycle of operations of the machine W. As the bars 163 are moved towards the machine W, the cams 176 move the plungers 170 into engagement with the links of the chains which are thus moved in timed relation with the machine W to carry a coated wrapper s under the form block thereof, the springs 175 moving the plungers out of engagement with the chains as the bars 163 move away from the machine W. The bars 163 carry adjustable arms 199 and as the bars move towards the machine W a finger 201 carried by the arms feeds a blank A from the hopper 194 into position beneath a reciprocating plunger p<2> which moves down as the bars 163 recede and forces the blank past plates 208, 212 which bend the blank into channel shape to form the bottom and two opposite sides of the box and deposit it upon arms 202 carried by the arms 199. While a blank A is being fed from the hopper 194 a previously bent blank deposited on the arms 202 is carried thereby between rollers 216, 217 which bend down the sides upon the bottom of the blank, the folded blank being then deposited upon spring-controlled plates 220, Fig. 5, beneath a second reciprocating plunger p<1>. Both plungers are moved in timed relation with the chains, bars and wrapping machine by connections from a cam groove 179 on the cam 148 and the plunger p<1> and its stem are hollow and connected to an air exhaust pipe 224 through a valve casing 247 carrying a valve operated from a cam 250 on one of the shafts 147. Two opposite faces of the plunger p<1> are perforated and in the uppermost position of the plunger these faces are disposed against the foremost blanks B in two slidable magazines 238 forced by springs or weights against the plunger which carries plates 243 disposed in planes parallel to the perforated faces of the plunger and projecting beyond them a distance equal to the thickness of the blanks B. As the plunger p<1> descends it is placed into communication with the air exhaust pipe 224 and consequently a blank B adheres to each perforated face of the plunger and is carried together with the shaped blank A, which is now engaged by the plunger, down past the plates 220 and on to the palms 231 and between the right-angular walls of fingers pivoted in arms 227 adjustably mounted on the bars 163.