Patent GB-316467-A (GB)
Title: Method of and apparatus for stencilling
IPC: D06B11/00
Filed: 1928-09-14
Abstract: 316,467. Marks, Sir G. C., (Selectasine System, Inc.). Sept. 14, 1928. Stencilling-apparatus.-In a process of stencilling through a blockedout fabric stencil stretched in a irame, the work is brought into contact with the stencil over a relatively small area, colour is forced through the stencil over the area of contact by means of a scraper or squeegee, and relative movement is caused between the work and the stencil to vary the area of contact. As shown, the stencil frame is reciprocated over a rotatable roller carrying a sheet to be printed, and a scraper engages the stencil at the line of contact. The stencil is stretched in a rectangular frame 77, Figs. 1 and 2, nested in a frame 88 carrying a .roller 91 at each corner, the rollers riding in tracks 29 formed on the vertical flanges of angle bars 25, 26 supported by a framework 12. The frame 88 is reciprocated by hand or by power, stops 98, 99 being provided to limit the movement. A sheet 67 to be printed is fitted on a roller 66 fixed on the end of a shaft 51 supported by bearings 45, 50, the bearing 50 being pivoted to a base 20 mounted on converging brackets 18, 19, and the bearing 45 being bolted to a vertical rod 37 adapted to be raised by depressing a treadle 40 linked to the rod whereby the roller 66 is raised into operative position relative to the stencil. A gear 65 is simultaneously moved into mesh with a rack on one side of'the frame 88, which is cut away at each end to allow this movement of the gear, so that the roller 66 is rotated as the frame reciprocates. A notch in a disc 53 on the shaft 51 engages a fixed vertical bar in the lowered position of the shaft, and when this is raised and rotated the notch moves out of register and the bar by engaging the periphery of the disc supports the roller 66 in the operative position for one revolution when the notch again registers. Inking-apparatus.-Colour is forced through the stencil by means of a scraper 113, Fig. 6, carried by a cross bar 108 pivoted on a shaft 103 by means of a pair of arms 109, the pivotal movement being limited by screws 104, 105 engaging one of the arms. A colour pan consisting of a base 117 and a vertical plate 116 is slidably mounted on rods 114 projecting from the bar 108 and is normally pushed to the left by springs 119. When the stencil moves to the right, a mass of colour 141 is squeegeed over the stencil by the scraper 113, and. at the end of the stroke, the rear cross bar of the stencil frame 88 engages the plate 116 and moves it to the right against the action of the springs 119, so that the colour is pushed back on to the base of the container. Catches 125 on the plate 116 then snap into grooves in the ends of the rods 114 and lock the pan in this position. On the return stroke of the stencil frame, a friction foot 111 on one of the arms 109 engages the top of the rack and the bar 108 swings about the pivot 103 to raise the pan off the stencil. At the end of the return stroke, fingers 93 on arms 92 fixed to the stencil frame release the catches 25, whereupon the springs 119 return the pan to its normal position, and the colour is scraped off the base 117 on to the stencil by means of a blade 130 supported by the bar 108.