Patent GB-176963-A (GB)
Title: Improvements in an automatic cup forming machine
Filed: 1921-01-17
Abstract: 176,963. Rogers, F. H., (Vortex Mfg. Co.). Jan. 17, 1921. Paper bags and the like, making.-A machine for forming paper and like cups, Fig. 18, from blanks 116, Fig. 19, and attaching circular reinforcing-discs 115 to the tips thereof, comprises conical forming and pressing rollers 8, 27 respectively, Figs. 1 and 6, means for feeding the blanks and discs to the forming-roller, and means for removing the finished cup therefrom. The blanks are fed to the rollers by a slide 77, having a raised portion 99 corresponding to the shape of one side of the blank and an auxiliary slide 100, mounted on the underside of the slide 77, is normally held in its extended position, to support the projecting portion a of the blank by a spring 101, Fig. 14; the slides are reciprocated in guides beneath a table 75 by an arm 80 connected to the slide and resiliently connected to a bell-crank lever 84, 85 operated from the driving-shaft 31. The motion of the slide 100 is arrested when in proximity to the rollers by a projection thereon engaging a part of the bracket 76, the motion of the slide 77 continuing until the blank is between the rollers when a portion of the arm 80 contacts with an adjustable stop on the bracket 76 and arrests the slide; the projecting portion of the blank then projects through the rollers and rests upon an adjustable holder 106. The rollers are geared together to wind and press the blank upon the roller 8 and are driven from the shaft 31, the roller 27 being adjustably carried in a bracket 18 pivoted at 19 to a carriage 20 and resiliently forced towards the roller 8 by springs 26, the movement on the pivot being limited by an arm 24 on the bracket contacting with an adjustable stop 25 on the carriage 20 which is periodically reciprocated in the frame 1 by a cam 37 engaging a roller 38 on the carriage. The blank is held on the roller 8 by a finger 9 normally held in contact with the roller by a spring 15 but retracted, when the carriage 20 rises and the rollers are separated, by connections with the former which actuate a forked lever 46 engaging a collar 17 slidable on the shaft 4 and engaging rollers on a yoke 11 pivoted to the roller 8 and finger 9. The blank is inserted between the rollers by the slide 77 when the carriage 20 is raised, downward movement of the carriage permitting the finger 9 to clamp the blank to the roller and the rollers to co-operate to form a cup on the roller 8. The blanks are coated on one side with paraffin or other waterproofing material to waterproof the cups and for attaching the overlapping portion of the blank to the body, the pressing-roller 27 being heated to facilitate such attachment by a burner supplied with gas from a pipe 68. The roller is cleaned from paraffin &c. by a resiliently-mounted scraper 71 carried by a holder 70 and a block 73 on the holder engages the apex of the cup upon the roller 8 to lay the folds of the cup and secure thorough attachment between them. The discs 115 are contained in a vertical magazine 118 and are fed to the rollers so that each is positioned upon the cup with its diameter upon the margin of the overlapping portion of the blank. The discs are drawn through an aperture in the bottom of the magazine by a cam-shaped roller 128 journaled in an aperture 123 of a slide 122 and carrying a gear 129 engaging a fixed rack, the surface of the roller being in communication, by a passage 131, with a flexible pipe connected to an air-pump, the piston rod 136 of which is actuated from the arm 84 to cause a suction in the passage 131 when the slide and roller are in the forward position shown in Fig. 14. The slide is pivotally connected to an arm 141 having a cam surface 142 adapted to be engaged by a roller 145 on the arm 91 of a bellcrank lever 91, 92 at each downward movement of the latter to reciprocate the slide in longitudinal guides; springs 146 tend to maintain the slide in its forward position determined by an adjustable stop 148 ; the lever 91, 92 is actuated from a gear 35 driven from the shaft 31. As the slide is retracted by the arm 141, the lowest disc in the magazine, being attached to the surface of the roller 128 by the suction in the passage 131, is withdrawn by the rotation of the roller until released therefrom at the end of the backward movement of the slide when the air-pump piston has completed its downward movement and in its upward movement, restores the air pressure in the passage 131. During the backward movement of the slide the discs in the magazine are supported by a tongue 124 on the slide. The released disc falls on to an inclined trough 150 down which it slides against a spring-controlled pivoted finger 151 carrying an adjustable shoe 155 while the upper edge passes over a guard 159 in tront of a hook 158 projecting through an aperture in the bottom of the trough. The hook is carried by a shaft 157 connected by an arm 160 to the slide 122 so that, as the disc engages the finger 151, the hook is moved to engage the upper edge of the disc and buckle it. At this point a latch 156 on the slide engages the shoe 155 to remove the finger 151 and allow the disc, by its own resiliency, to spring into the space between the rollers to become attached to the cup. The completed cup is removed from the roller 8 by fluid pressure, lateral passages 51 in the roller communicating by a bore 50 in the shaft 4 and in a sleeve 52 with a chamber 55 connected to a valve casing 57 in connection with the air or other supply pipe 58. The gear 35 carries a pin which, at each rotation there, contacts with a pivoted latch to open the valve in the casing 57, thus permitting air &c. under pressure to pass through the bore 50 and force the cup from the roller. In order that the rollers may make several rotations while the cup is being formed, the driving pulley 1/0 is loosely mounted on the shaft 31 and a sleeve 173, fixed to the shaft, carries a bolt 174, Fig. 9, extending parallel to the shaft with its outer end projecting into a circular groove 171 in the pulley and arranged to engage a stop 172 fixed across the groove; a spring 175 normally maintains the bolt in the groove to relatively connect the shaft and pulley. A cam surface 178 on a stem 179 is slidably mounted in a bracket 177 and carries a collar 181 having a shoulder engaged by a latch slidable in a bearing and connected to a trigger pivoted in the bracket. The upper end of the trigger extends into the path of a projection on the gear 35 so that at each rotation of the latter, the trigger is actuated to disengage the latch from the shoulder on the collar 181 and permit a spring 180 to force the cam 178 into the path of a roller 176 on the bolt 174 to withdraw it from the stop 172 and stop the machine. The cam is normally withdrawn to start the machine by levers 189 connected to the stem 179.