Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer Service Manual page 49

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Operating Principles
Figure 2-12 shows the operation of the tractor select mechanism. Clockwise rotation of the RF
motor is transmitted to the tractor select cam through the ribbon feed select gear and tractor select
transmission gear, and rotates the tractor select cam clockwise. The tractor select lever contacts the
inside curve of the cam due to the spring force; when the cam rotates, the tractor select lever moves
horizontally along the curve.
When the tractor select lever is set to the left, the tractor select gear engages the rear tractor
assembly train, and the PF motor rotates the rear tractor assembly. When the tractor select lever is
set to the right, the tractor select gear engages the front tractor assembly. The tractor select sensor
contacts the cam and closes when it reaches the convex portion.
TRACTOR DRIVE
GEAR
TRACTOR SELECT GEAR
HOLDER
TRACTOR SELECT
SENSOR
RIBBON FEED SELECT
GEAR
RIBBON FEED MOTOR~
2-1o
=
Figure 2-12. Tractor Select Mechanism
—TRACTOR SELECT
TRANSMISSION GEAR
–TRACTOR SELECT
LEVER LOWER
-TRACTOR SELECT
LEVER UPPER
-TRACTOR SELECT CAM
Rev. A

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