Patent GB-600212-A (GB)
Title: Improvements in or relating to machines for decorating articles, such as hollow-ware
IPC: B28B11/00
Filed: 1945-07-05
Abstract: 600,212. Stencilling-apparatus. SOLAR LABORATORIES. July 5,1945, No. 17156. Convention date, Dec. 1, 1944. [Class 100(ii)] A machine for stencilling designs on articles such as bottles comprises a squeegee and a workholder movable towards and from one another, a stencil interposed between the squeegee and workholder, and means for withholding the squeegee from engagement with the stencil unless the workholder is loaded when it is being moved towards the squeegee. (1) The work is held between a chuck-plate 164, Fig. 2, and a member 5, the former being rotatably mounted on and adjustable vertically relatively to a carrier arm 133 pivoted at 4 so that the workholder falls to an inoperative position by gravity, and the latter being carried by an arm 171 pivoted to an extension 160 of the arm 133. The arm 133 is rocked by a rotary cam 9 acting through a rocker 175 and an adjustable ball-and-socket rod 179, and the arm 171 is actuated from a face cam 10 fixed to the cam 9 and angularly adjustable relatively thereto, acting through a rod 192, a lever 193 pivoted at 194 and a rod 196: the cams are two-lobed whereby the workholder and squeegee are separated from the stencil at the end of each stroke of the latter. The work is supported on conical rollers 164a which may be provided at either or both ends of the work; where supporting-rollers are provided at the left end of the work, the member 5 may be merely a feeler for detecting pressure of a bottle. The chuck 164 may be rotated by a string wound around a pulley 165 and tied at the ends to posts 168, Fig. 4. (2) A squeegee 8, Fig. 2, is hinged to a block 63 clamped in adjusted position along a bar 61 extending from a frame 58, Fig. 4, pivoted at 8a within a frame 52 pivoted on pins 49 carried by fixed arms 47, a spring between the frames and a spring 70 above the frame 58 being provided to compensate for the weight of the bar and squeegee. The outer frame 52 is connected by a link 140, Fig. 2, to the workholder arm 133 whereby the squeegee is lowered as the work is raised and vice versa. (3) A stencil-screen 2, Fig. 4, is stretched in a frame 91 fixed to angle bars 90 bolted to a plate 78 slidably guided on a fixed plate 73 by means of grooved rollers on the former engaging the edges of the latter, two of the rollers being eccentrically mounted : holes 88 in the plate 78 allow for adjustment of the bars 90 to suit different lengths of screens and to vary the position of the screen. The guide 73 is arcuate for conical work. The stencil is moved in one direction by a rotary cam 11, Fig. 3, engaging a roller 102 on a bar 98 pivoted at 99, an arm 111 pivoted at 115 and connected at 117 by screw-adjustable rods 119 to the plate 78 having a slot in which rides a roller 112 fixed in adjusted position along a groove in the bar 98. The parts, including the stencil, are returned to normal position by a spring 126 acting on a rod 125 connected to a bracket 123 extending from the bar 98. The limit of the outward stroke of the stencil may be adjusted by varying the position of the roller 112 and 'the lengths of the rod 119, and the stencil may be stopped at any desired point on the return stroke by means of an adjustable screw stop 128. (4) When no work is present in the workholder 5, 164, the member 5 moves inwardly further than usual and rocks an arm 197, Figs. 2 and 9, carrying a pin 200 which moves to the right so as to engage a ledge 202 on a bar 203 fixed at one end 204 to the outer squeegee frame 52, the other end of the bar 203 engaging the end of a screw 207 on the inner frame 58 of the squeegee assembly whereby the squeegee is prevented from engaging the stencil. (5) The machine is driven by a motor 21, Fig. 2, having a variable-size cone pulley, driving a speed reduction box the output shafts of which carry the cams 9, 10 and 11. The motor is bodily adjustable on a base 20 to vary the speed ratio by turning a screw 22 connected by chain gearing to a shaft 28 turned by a handle 30.