| 摘要 |
<p>1,210,902. Selective embossing. DYMO INDUSTRIES Inc. 3 Jan., 1969 [24 Jan., 1968], No. 496/69. Heading B6F. A selective embossing machine includes a feed roll 52 engaging a strip 14 of embossable plastics material, and an actuating lever 60 which when depressed pivots at 62 to urge a crank 76 through a link 66 to rotate the feed roll 52 by an amount which is variable, the link 66 disengaging from the crank 76 at the end of the stroke thereof and further depression of the lever 60 acting to actuate a hammer 34 through a cam 94 for embossing the strip. The end of the stroke of the crank 76 is defined by engagement of an arm 78 engaging a stop 80 having selectable stop surfaces 84, 86. The crank 76 is coupled to the feed roll 52 by a unidirectional clutch comprising a first helical spring 90 which tends to grip hubs of the crank 76 and feed roll 52 when the crank is rotated in the feed direction, but which tends to unwind when the crank returns to the ready position. A second helical spring (112), Fig. 4 (not shown), couples the feed roll 52 to a boss (114) on the frame (12) of the machine, the spring loosening when the feed roll rotates in the feed direction but tightening to prevent rotation in the reverse direction. The hammer 34 engages the bottom plate 44 of an interchangeable embossing wheel assembly 36. An idler roller 56 presses the strip 14 against the feed roll 52, the idler roller being carried by a member 134 which is formed with a detent (140), Figs. 7, 8 (not shown), which is adapted to engage a lip (144) of a magazine carrying the strip so that when a magazine is changed, the idler roller 56 is disengaged from the feed roll 52. A pair of side guides 150 may be selectively raised or lowered through a cam 152.</p> |
