Basic Operation - Sharp AR-F15 Service Manual

SADDLE STITCH UNIT

BASIC OPERATION

1. This chapter discusses the purpose and role of each of the saddle stitch functions, and the
principles of operation used for the stitch mechanical and electrical systems. It also explains
the timing at which these systems are operated.
The symbol in drawings indicates transmission of mechanical drive, and signals marked
by together with the signal name indicates the flow of electrical signals.
2. In descriptions of digital circuits on the stitch, "1" indicates a high signal voltage level, while
"0" indicates a low signal voltage level. Voltage values differ according to circuit.
A microprocessor is used on the stitch. A description of microprocessor operation is omitted in
this chapter as it is practically impossible to check internal operation of the microprocessor.
Descriptions in this chapter also assume that PCBs will not be repaired at user sites. For this
reason, descriptions of circuits on PCBs is limited to block diagrams. Two types of block dia-
grams are provided for separate functions: diagrams indicating details from sensors up to input
sections of major PCBs, and diagrams indicating details from the output sections of major
PCBs up the loads.
I. BASIC OPERATION .................... 3-1
A. Outline ....................................... 3-1
B. Electrical Circuitry ...................... 3-2
C. Inputs to and Outputs from the
Saddle Stitch Controller PCB ..... 3-3
II. FEEDING/DRIVE SYSTEM ......... 3-8
A. Outline ....................................... 3-8
III. PAPER OUTPUT
MECHANISM............................. 3-14
A. Outline ..................................... 3-14
B. Controlling the Inlet
Flappers ................................... 3-17
CHAPTER 3
IV. STITCHING SYSTEM ............... 3-28
V.
VI. CHECKING FOR A JAM ........... 3-38
VII. POWER SUPPLY ...................... 3-43
C. Controlling the Movement of
Sheets ...................................... 3-21
D. Aligning the Sheets .................. 3-23
E. Controlling the Phase of the
Crescent Roller ........................ 3-26
FOLDING/DELIVERY
SYSTEM .................................... 3-31