GB695071A - Improvements in or relating to printing devices - Google Patents

Abstract

695,071. Rolling hand-stamps. SCHNACKEL, H. June 27, 1951, No. 15197/51. Class 100(ii) In a roller hand stamp: (1) the printing roller has hoop rings on its periphery adapted to drive it by contact with the impression-receiving surface; (2) the printing roller actuates spring means which return it to its starting position after an impression has been made in either direction of rolling; (3) the printing roller axle is slidably supported in slots in the housing permitting a short movement perpendicular to the impression-receiving surface, and ink rollers are resiliently pressed against a rubber stereo (text and/or pictorial) on the printing roller, the short movement of the latter into the housing serving by means of resilient transmission members to increase this pressure; and (4) means are provided on the ink rollers to prevent inking on non- printing areas of the rubber stereo and on the hoop rings. The printing roller 9 of the device shown has two dove-tail recesses parallel to its axis which receive corresponding rubber pieces glued to the underside of the rubber stereo 27. (1) The hoop rings 26 are elastic, have teeth projecting beyond the printing surfaces 15 of the rubber stereo 27, and are held on the roller 9 by the edges of end covers 22, 23. (2) A pin 19, fixed in the roller 9, is loaded to return to its position adjacent two yokes 17, 18, fixed in the roller axle 4, whatever its direction of displacement, by two springs 14, 16 the crossed ends of which embrace the pin 19 and yokes 17, 18; flats on the ends of the axle 4 prevent rotation. (3) The ends of the axle 4, slidable in slots in the inner walls 39, 40 of the housing, carry pins 5, 6 each of which passes through a yoke 8 pressed away from the axle by a spring 7; the yokes engage two-armed levers 10, 11, pivoted at 12, 13, the lower ends of which engage the ink roller axles 21 projecting through slots 41, 42. In modifications: (i) the ends of the crossbars of T- shaped members secured to the axle 4 are connected by tension springs to the upper arms of the levers 10, 11; (ii) the axle 4 is urged downwards by two leaf-springs, the ends of one engaging beneath fixed projections on the walls 39, 40, while the ends of the other engage beneath the upper arms of the levers 10, 11. (4) The ink roller axles 21 carry removable cylindrical pads 28 clamped between flanges 29 and (in multi-colour printing) spaced by partition discs 30; the parts 29, 30 protrude beyond the pads 28 to control the position of the latter relative to the printing roller 9, so that the printing surfaces 15 alone are inked.