Stepper #1 Control; Punch Control; Stepper #2 Control - GBC AdvancedPunch Technical & Service Manual

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Section 6

6.9.5 Stepper #1 Control

6-12

If punch is not enabled, the Advanced Punch will run in bypass mode (no punching).

Either the printer or the first sheet entering the machine will turn on both stepper motors.

The time is measured for the leading edge of the first sheet to pass sensor 8. Knowing the

distance between sensors and the time it takes for the sheet to pass both sensors, we can

determine the speed of the paper. The time is compared to a list and Stepper 1 and stepper

2 are adjusted to closely match the incoming speed.

If the punch is enabled, the backstop is raised, the brake is engaged, and both the transport

and punch motors are started. Also, the divert solenoid is activated to direct the sheets into

the punch path. As above, the input speed is measured, this time using Sensor 1 and 2.

Stepper 1 is adjusted to meet the measured input speed; Stepper 2 is accelerated to the

speed of the transport motor. Sensor 2 now delays for a time period based on the input

speed to ensure that the sheet has cleared the printer exit roller. After this delay, stepper 1

accelerates the sheet to match the transport speed. 19 msec after the sheet's trailing edge

passes sensor 2, Stepper 1 is decelerated to match the previously measured input speed.

The punch cycle begins 40 msec after the leading edge of the sheet reaches Sensor 3. The

brake is released, and the clutch is engaged. Sensor 9 now looks for the leading edge of its

flag, and when seen, the clutch is disengaged, and the backstop is lowered. When the

trailing edge of the flag is seen, the brake is engaged. When Sensor 3 sees the trailing edge

of the sheet, the backstop is raised.

72 msec after the leading edge of the sheet passes Sensor 6, Stepper 2 is decelerated to

match the measured input speed from the printer. This delay ensures that the sheet exits

from the transport rollers. When the trailing edge of the sheet passes Sensor 6, Stepper 2 is

accelerated to match the speed of the transport motor.

Advanced Punch Service Manual

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