Patent GB-672808-A (GB)
Title: Improvements relating to machines for automatically wrapping small quantities of powdered material in paper or the like
IPC: B65B11/54
Filed: 1949-10-07
Abstract: 672,808. Powder wrapping machines. CROLLIE, J. W., and SPRINGETT, W. C. April 28, 1950 [Oct. 7, 1949], No. 25831/49. Class 94(i) [Also in Group VIII] The invention relates to a machine for twist wrapping small quantities of powder in which a vertically disposed and reciprocated tubular plunger pokes down a paper sheet placed in its path to form an open-topped paper cup and delivers powder thereto, or on to the uncupped sheet, and an upper gripper means holds the neck of the packet stationary while rotating lower gripper means twist it, the completed packet being dropped clear of the grippers down a delivery shoot. Paper strip is drawn from a supply roll, adong a channel 17, Figs. 1 and 2, to cover an orifice 81 in a die plate 18, by reciprocating feed means which incllde a shoe 20, slideable in grooves 26 along the sides of the channel 17, over which the strip passes, and a dog 21 pivoted at 22 to the shoe and actuated, by link means 65, 63 from a rotary face cam 57, first to move forward about its pivot 22 to grip the strip between it and the shoe and then to move the shoe forward to feed the strip over the orifice 81 where a wrapper is cut from the end by a knife 33, the dog 21 being then pivoted out of engagement with the strip and the shoe pulled back. The blade 33 is reciprocated by lever means 36 actuated by a main vertically reciprocating slide 1 which carries a tubular powder feed and cup forming plunger 6 and which is driven from a crank 145 through levers 147, 150. An upwardly spring-pressed pad 45 cooperates with the blade 33 to hold the paper strip in position, the strip being released during the upward movement of the blade, after feed shoe 20 has been pulled back. An upper, non-rotatable gripping means positioned just below the opening 81 in the die plate 18 comprises, Figs. 3, 11, 14, four dogs 69, disposed in a common horizontal plane, oscillatable together inwardly and outwardly and housed in a recess in a ring 80 secured below the opening 81. Each dog is pivoted at 73 to an oscillatable annular block 92 and pins 105, depending from the ring 80, engage in slots 109 in the dogs so that angular movement of the block 92 will move the dogs in or out. In an alternative construction the pins 73 may depend from the ring 80 and the pins 105 extend from the block 92. The block 92 is oscillated by a cam 82 on the main slide 1 engaging a pin 83 to move a block 84 horizontally against a spring 94, a recess in the block 84 being engaged by a pin 89 depending from an arm 91 extending radially from the block 92. Lower gripper means comprises four upwardly extending levers 110, whose upper end portions 111 grip the paper cup, pivoted at 112 to a tubular member 113 journalled fixed sleeve 133, and continuously rotated fixed sleeve 133, and continuouly rotated by by a pulley 120 secured to its lower end. The levers 110 are moved inwardly againsst the action of springs 140 by the engagement of their upper ends in a conical receess 117 in the block 92 consequent upon an upward movement of the bush 114. A plunger 126 spring-pressed upwardly in an extension 122 of the main slide 1 engages a flanged second plunger 129 in turn engaging an arm 134 extending from the bush 114, alternatively the plunger 126 may be replaced by a sliding friction bolt, the arrangement being such that the lower gripper unit is only raised, and thus closed, at the top part of the travel of the main slide 1. The lower gripper means opens before the upper gripper which latter opens to allow the packet to drop out through a tube 143 whose upper end extends to a position abreast of the jaws 111, slots 144 in the tube allowing radial movement of the jaws. Means for feeding powder to the tubular plunger 6 comprise, Fig. 3, an intermittently rotated horizontal plate 154 formed with peripheral apertures or measuring pockets 155 and submerged beneath powder in a hopper 4, the powder being discharged down a tube 156 in the hopper base when an aperture 155 moves thereover and under a cut-off member 157 spaced thereabove. The plate 154 is rotated by the main slide 1 through pin 159 and linkage 161, 166 means and ratchet means 172, the pin 159 engaging a notch 160 (or alternatively a slot) in the link 161. Specifications 672,839, 672,840, 672,841 and 672,842 are referred to.