Patent GB-172209-A (GB)
Title: Mechanism for manufacturing paper cups
IPC: A21B1/46
Filed: 1920-11-17
Abstract: 172,209. Weckbaugh, J. V. Nov. 17, 1920. Paper bags and the like, making.-Paper cups, Fig. 5, are made from blanks 20, Fig. 1, generally of square shape, a corner 23 thereof being doubled under along a line 24 at right-angles to a diagonal 25 and the blank being then doubled about that diagonal to superpose the edges 26, 27, which are then secured together, preferably by doubling them with a perforated metal binding-strip 28. In the doubling of the corner 23, both surfaces are pressed into corrugations 30 which hold the parts together and facilitate the shaping of the cup. The cups are formed in the machine shown in Fig. 6 from rolls 45, 46 of paper and binding-strip 21, 28 respectively, the materials being drawn from the rolls by feed-rollers 51, 52, Fig. 14. The end of the lower roller 52 is reduced and carries teeth 54 which engage the perforations of the binding-strip so that less binding-strip than paper is fed forward. A main shaft 60, rotated by a crank 42, carries the cams actuating the feeding and clamping devices, and is connected by sprockets 57, 59 and a chain 58 with the shaft 56 of the feed-roller 51, the shafts 56, 60 being connected to the sprockets by ball clutches or similar devices so that one shaft is idle while the other is operative. By this means the paper and binding-strip are fed forward, after one or more revolutions of the crank, on the return movement thereof; such return movement may be automatically effected by a spiral spring connected by a cord to the sprocket 59. The edge 26 of the paper, as it is fed forward is guided by a lateral guide 65, Fig. 7, and its forward corner 23 abuts and is deflected downwards by a folding plate 66, Fig. 12, which, with another folding plate 80, are hinged to the forward portion of the member 70 rotatably mounted in the frame on the axis 12-12. The member 70 has a series of pins 71 at the rear corner to hold the paper while being folded, the pins being caused to engage the paper by an arm 73 projecting from a lever 72 beneath the member 70; a member 75 arranged over the paper is engaged by the pins. The lever 72, which is operated by a cam on the shaft 60, is held lifted, and the member 75 is held in contact with the paper, until the turning movement of the member 70 begins, and is moved out of the path of the member 70 at the proper moment by connections from the shearing member 99 referred to below. The folding plates 66, 80 have their coacting surfaces corrugated and are closed to complete the doubling of the corner 23 and form the corrugations 30 by the divided forward portion of a plunger 81 mounted in the member 70 and forced forward by an inclined member 82 operated by a link from a cam on the shaft 60 ; a spring 86 returns the plunger inwardly as the inclined member is retracted by its spring 85 and a spring 87 forces the folding plates to their normal open position. The paper is supported at the sides of the folding plates by the arm 73 and a pivoted arm 89 operated by an extension from the lever 72. Immediately preceding the folding of the blank about the diagonal 25, the edge 26 of the blank and binding-strip 28 are gripped between the guide 65 and a pivoted jaw 95, Fig. 8, and cut along the line 27 by the upward movement of the knife 99 of a shearing-member 99, 100. The knife 99 is actuated by cams on the shaft 60 and in its upward movement in vertical guides, releases an extension 127 on the jaw 95 which is drawn upwards top grip the blank and strip, by a spring 96. The severed blank is then folded about the diagonal 25 by the rotation of the member 70, caused by a rack 110, actuated by a lever from a cam on the shaft 60, engaging a toothed segment 111 on the member. The binding-strip 28 is guided in grooves in the jaw 95 and in a similar opposed pivoted jaw 106 lying on the extension 127 of the jaw 95, with the edge 26 of the paper above it, the folding of the blank bringing the edge 27 over the edge 26. The edges 26, 27 are forced into V-grooves 125 at the coacting edges of the jaws 95, 106 by a toothed blade 120 controlled by a cam on the shaft 60, the teeth of the blade entering the corresponding recesses in the jaws. On the blade 120 engaging the blank, the member 70 is released by its cam and returned to the normal position by a spring, and further downward movement of the blade forces the paper edges 26, 27 and a strip 28 to assume the shape of the grooves in the jaws. The jaws are then released by a member 126 operated by a cam on the shaft 60 and, by the blade 120, are depressed and turned on their pivots to compress and bind the strip 28 over the edges 26, 27. The upward movement of the jaw 95, through the action of the spring 96. tends to eject the completed cup from the jaws through an opening 130 in the frame.