Patent GB-641975-A (GB)
Title: A method of, and apparatus for, forming articles such as patty pans from paper or other thin material
IPC: B31B50/59
Filed: 1947-08-08
Abstract: 641,975. Embossing-machines; feeding sheets. WILLIAMSON, J. T. Aug. 8, 1947, Nos. 21951 and 21952. Convention dates, Oct. 22, 1946, and Dec. 16, 1946. [Classes 100 (i) and 100 (ii)] Patty pans or like articles are formed from paper or other thin material by separating and removing a measured quantity of blanks of the material from the bottom of a vertical stack of blanks, pressing the measured quantity of blanks to desired shape and delivering the press-formed articles. A main frame comprises a table top 2, legs 1, 1a and suitable cross-bars 3 having bearings 4 rotatably carrying a main shaft 5 driven at slow speed from a motor 6 through reduction gearing. A series of rings or platens 41 are secured to a turntable 40 rotated intermittently with a vertical spindle 29 and horizontal spindle 33 through gearing 31, 32, a rocker arm on the spindle 33 having a pawl co-operating with a ratchet-wheel 36 and operated by a connecting rod 37 from the shaft 5. The press mechanism comprises a base 48 and bolster 47 secured to the table 2, a vertical post 49 and a guide boss 50, a die block 58 being mounted on the bolster 47 and carrying the fluted die 59 and a heating element 60 if required. The guide boss 50 carries a slidable plunger 51 intermittently operated from a rocker arm 52 connected to a pusher arm 54 having a roller held in a groove of a press cam 55 on the shaft 5, and to the plunger 51 is secured a rod 61 carrying a fluted ejector block 62 inside a punch 64, which block 62 holds the punch in retracted position, the punch being pressed downwards, by. compression springs 72 acting between lugs on the boss 50 and a plate 69 overlying the punch 64, to pass through a stationary platen 41 to the die 59. A cylinder 73 secured to the boss 50 holds a stack of blanks 76 above a platen position immediately before the press mechanism and a weight 77a bears on the blanks to press them into a stationary platen 41, a blade 78 then being moved horizontally into the cylinder just above the platen 41 to separate the quantity of blanks in the platen 41 and then vertically to lift the remainder of the blanks, the filled platen moving to position under the punch 64, the next platen moving under the cylinder and the blade then being lowered and retracted. The blade 78 is secured to a sliding motion bar 79 and moved by a rocking lever 22 pivoted at 23 and connected by a pin 21 to a cam rod 17 having a roller 16 held in contact with a cam 15 on the shaft 5, pins 80 on fixed posts 81, 81a on the table 2 sliding in slots 84, in the bar 79, which are downwardly bent at 84b to give vertical lift to the blade 78 when it has entered the stack of blanks. A callipering blade 85 is positioned above the blade 78 so as to make an' indent in the stack of blanks in a position for the entry of the blade 78 in the next operation. In a modification of the measuring device, Fig. 11, the blade 78a is secured to a bar 79a having a cam face 92 which is engaged, when the blade 78a enters the cylinder 73, by a roller 105 connected to a finger bar 100 sliding in a bracket 99 and having a shaped point 103 which enters the stack of blanks 76 when the blade 78a is withdrawn and presses the edges downwards under the action of a spring 101. The plate 45 under the platens 41 carries a lifting plate under the cylinder 73 to compress the blanks from below and which is operated by a cam 97 on a rod 98 connected to the rocking lever 22. A lifting lever 107, operated by a cam or the like on the shaft 5, is provided, the inclined slots 84b being omitted and the front slot 84a only having an enlargement 91 to allow lifting of the blade 78a.