Toshiba 4560, Service Manual

Page: 275 / 369

Nov. 1997 © TOSHIBA 18 - 17 4560/4570 RADF
18.4.2 Description of original feeder operation
A. Single-side original feed operation
1. When the original is placed on the original feed tray, the original is detected by the empty sensor, and
the ORG-RDY signal is set.
2. When the ORG-IN signal is received from the main unit, DF-ACT is set, and original replacement is
started. When a fixed amount of time has elapsed since the feed clutch turned ON, the motor is
driven in the reverse direction to start original feed.
3. After being driven for a fixed number of pulses after the leading edge of the original arrived at the
aligning sensor, the motor is stopped. When the leading edge of the original arrives at the aligning
roller, aligning is carried out. At the same time, the state of the size width sensor is stored to memory.
When a fixed amount of time has elapsed since the motor stopped, the feed clutch is turned OFF.
4. When a fixed amount of time has elapsed since the transport clutch turned ON, the motor is driven in
the forward direction to feed the original onto the glass surface. At the same time, travel size detec-
tion is started (resumed when there is two-step pre-feeding).
5. The PRE-STP signal is set by the set timing of the PRE-STP signal.
6. When the trailing edge of the original exits the aligning sensor, the DF-ACT signal is reset, travel size
detection ends, and the original size is detected together with the state of the size width sensor
stored to memory in 3. and 11. When the original is an irregular size, or when the original size is
different from the size of the original that passed through previously, the original size data is transmit-
ted to the main unit.
7. The ORG-STP signal is set by the set timing of the ORG-STP signal.
8. After being driven for a fixed number of pulses after the trailing edge of the original has exited the
aligning sensor, the motor is stopped, and the original is placed at the exposure position. When a
fixed amount of time has elapsed since the motor stopped, the transport clutch is turned OFF, and
single-side feed ends.
9. When the fed original is A4-size (landscape) or letter-size (landscape), the DF-SGL signal is reset
and the original is on the tray, the PRE-FED signal is set, and pre-feeding operation is started.
Otherwise, operation starts from 14.
10. When a fixed amount of time has elapsed since the feed clutch turned ON, the motor is driven in the
reverse direction to start pre-feeding operation.
11. The same operation as 3. is carried out, and pre-feeding operation ends.
12. The motor is driven in the forwards direction to star t two-step pre-feeding operation. At the same
time, travel size detection is started. After being driven for a fixed number of pulses, the motor is
stopped. When a fixed amount of time has elapsed since the motor stopped, the transport clutch is
turned ON, two-step pre-feeding operation ends, and the machine stands by.
13. When the next ORG-IN signal is received, the PRE-FED signal is reset, and operation is resumed
from 4. However, note that the transport clutch is turned ON at 12., so the transport clutch is not
turned ON.