GB1122209A - Print hammer mechanism - Google Patents

Abstract

1,122,209. Selective printing. INTERNATIONAL BUSINESS MACHINES CORP. 11 May, 1966 [12 May, 1965], No. 20783/66. Heading B6F. Type - wheel machines; multiple type surface selection; hammer impression arrangements aligning for impression. A calculating machine having a number of type-wheels 20 which are set for selective printing by a slide 23 which is arrested by the shank of a depressed amount key 25, following actuation of a motorized key (not shown), is provided with a hammer mechanism which includes a pivotally mounted hammer 3 impelled for impression by the arm 11 of a lever 2, whose arm 18 and arm 11 subsequently engage respective hammer surfaces 19 and 13 to arrest the hammer after impression and prevent rebound. To effect impression a lever 26 is rotated anti-clockwise by a driven lever 37 (Fig. 5) whereupon a segment 4 is rocked clockwise under the action of spring 5 attached to arm 2A of lever 2 until it engages one of abutments or recess 27 which adjust the force of the spring 5 in accordance with the surface area of the printed character, a pin 29 on the lever 26 is moved concomitantly with the lever in the anticlockwise direction to permit a lever 28 biased by spring 30 to pivot anti-clockwise and align the set type-wheels 20 by engaging a type face aligner 31 with the spaces between types 8. Moreover, pivoting of the lever 26 causes its lug 26A to engage an arm 32A of bell-crank 32 and pivot the latter anti-clockwise whereby a lug 33 engages a slide 35 to raise it upwardly and release arm 11 of lever 2, which is now pivoted by the spring 5 to impel the hammer against the type 8, the pin 36 having been previously pivoted upwardly. Hammer is reset by arm 18 when pin 36 which is mounted on a lever 44 (Fig. 4), is pivoted downwardly by action of lever 37 on the lever 44.