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The present structure provides an impact printer utilizing a shared motor drive for the impact printer carrier and character-selection devices.
English (United States)
This text was extracted from a PDF file.
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100% of the total text.
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Impact Printer with Carrier and Character Selection Apparatus Driven Off
The present structure provides an impact printer utilizing a shared motor
drive for the impact printer carrier and character-selection devices.
This apparatus makes use of a single stepping motor to drive the carrier for
the escapement function and also accomplish character selection. The stepping
motor is located off the carrier, mounted on the machine frame. Motion is
transmitted to the carrier and the print (selection) wheel by a timing belt.
Selection Cycle: The selection magnet 10 is normally not energized. The
return spring acting on the armature forces a dog 12 into the escapement rack 11. Horizontal carrier position is then defined. The return spring of the selection
magnet 10 armature has also pulled the dogs 13 from the teeth of the timing belt 14. The motor 15 now drives the print wheel through the timing belt 14 which is
held engaged with the print shaft by means of a back-up roller 16.
Escapement Cycle: The selection magnet 10 is now energized. This motion
moves the escapement rack dog 12 from the escapement rack and Moves the
carrier dogs 13 into engagement with the timing belt 14. The cams fastened to
the carrier located on the flat side of the timing belt serve to fix the carrier to the
belt 14. The stepping motor 15 positions the carrier to the next required
horizontal position for printing.
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