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The apparatus shown and described provides a means for controlling contact pressure between the platen and its associated backup rollers.
English (United States)
This text was extracted from a PDF file.
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100% of the total text.
Page 1 of 2
Platen Backup Rollers
The apparatus shown and described provides a means for controlling
contact pressure between the platen and its associated backup rollers.
Fig. 1 shows the relationship between platen 2 and backup rollers 4 which
are mounted in a housing 6 positioned to conform generally to the contour of
platen 2. Flat spring 8 is located beneath rollers 4. A cam with a lobe 10 is
positioned within a support assembly 12.
When cam lobe 10 is in its upright position, spring 8 is biased into housing 6
causing rollers 4 to contact platen 2. As shown in phantom, when cam lobe 10
has rotated clockwise, spring 8 is released and housing 6 and rollers 4 move
downwardly away from platen 2. Conventional means such as a lever may be
used to rotate the support assembly 12 and cam lobe 10. While only one
housing 6 and pair of rollers 4 have been shown, a plurality of such devices may
Fig. 2 shows more detaiver 1 80 structure of the device of Fig.1. Cam lobe
10 may be configured with a flat section, as shown, in order to provide a locking
action against further rotation once housing 6 with rollers 4 are in a position to
engage a sheet against platen 2.
Page 2 of 2
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