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Improvements in or relating to numerator mechanisms
Improvements in or relating to numerator mechanisms
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机译：分子机制或与分子机制有关的改进
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961,851. Number-printing apparatus. LAMSON PARAGON Ltd. March 12, 1962 [March 17, 1961], No. 9874/61. Heading B6C. A number-printing apparatus comprises a numeral printing mechanism movable in one direction into contact with material to be printed such as stationery, located by means 5 on the base-plate 1, and in a return direction for moving the numerator wheel forward by one unit, a spring 20 for urging the mechanism towards the stationery, and operating means serving during a part of its travel to load the spring and during a later part to trigger it to project the mechanism into contact with the stationery. A side wall 2 on the base 1 supports two plates forming a head 3 which is pivoted at 4. The numeral printing wheels 7 are mounted in a member 8 located within a casing 8a which is supported by arms 9 pivoted at 10 to the plate 2. A shank 15 extends from the member 8, and has an anvil 22 threaded thereon. The shank is associated with a pawl (not shown), for effecting a stepping movement of the wheels 7 on each return movement of the printing mechanism. A plunger 17 has a hollow body portion 18 which slides in a casing 19 fixed to the head 3 and contains a heavy spring 20 which urges the plunger downwardly. A post 21 extends through the central part of the plunger and is adjustably secured to the casing 19 by a nut 23. Movement of a lever 25 from the position I pivots the head 3 against a spring 12 so that the head engages the top of the casing 8a. Movement of the lever from position II causes a cam face 28 on the lever 25 to engage cam faces 24b on arms 24 which lift the plunger 17 and load the spring 20. Continued movement of the lever 25 causes separation of the faces 28 and 24b, position III, and the plunger 17 is projected downwardly by the spring 20 and hits the anvil 22. This causes the wheels 7 to print on the paper with a uniform pressure. The said pressure may be adjusted by altering the tension of the spring 20.
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