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This is a printwheel removal and ribbon cartridge lifting system using camming mechanism.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
87% of the total text.
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Printwheel Removal and Ribbon Cartridge Lifting Mechanism
This is a printwheel removal and ribbon cartridge lifting system using
In a printwheel printer, the printwheel 1 is normally attached to the shaft of
selection motor 2, which enables rotation of the printwheel for character-selection
purposes. The printwheel should be removable and interchangeable whenever
the typist decides. On the other hand, the carbon cartridge (not represented but
which would be on a horizontal plate located on top of the selection motor 2)
should be made to vibrate about an axis parallel to the printwheel throughout
regular printing operations to enable efficient use of the carbon ribbon.
Using the arrangement shown in the figure, both functions, i.e., printwheel removal and carbon cartridge vibration, may be
performed efficiently but still at a reasonable cost using one
single-stepper motor 3. When the motor shaft 4 is rotated, gear 5
moves gear 6 which is connected to the horizontal plate supporting
the ribbon cartridge through shaft 7 and links 8, and the plate and
therefore the carbon 5 cartridge are made to oscillate about an axis
parallel to the shaft 7. The cam 9 is then not moved until the pin
10 reach the end of the slot in gear 11. When the pins 10 reaches
the end of the slot 11 in gear 12 it begins to turn gears 12,
13 and 14, which are connected (Fig. 2), to the cam 9 by shaft 15.
The cam is rotated and thus allows the selection motor 2, which is