| 摘要 |
<p>A belt printing mechanism has endless type belts (1, 2, 3, 4) disposed parallel to one another and which carry print types (S) on their outer surfaces, The type belts are each led round an adjusting wheel (6) and a star wheel (8) rotatable about a shaft (7). A catch mechanism (25), which is held in positive engagement with the star wheels and holds these in a predetermined detent position, prevents free rotation of the star wheels. For printing multi-digit characters the print types to be printed from adjacently disposed type belts must be brought into a predetermined printing position, and to produce a clean imprint it must be ensured that these print types are exactly registered. To achieve this the catch mechanism has for each star wheel a spring tongue (26) which contacts the portion of the peripheral surface of the star wheel extending between two adjacent corners of the star wheel at at least two spaced-apart points and the plane of which forms an acute angle with the plane in which the star wheel rotates about its shaft. When adjusting the type belts, the catch mechanism produces force peaks which can be clearly felt by the operator and which make it easier for him to bring *he print types in the predetermined printing position.</p> |
