Basic Operation - Sharp AR-FN8 Service Manual

SADDLE STITCHER UNIT

BASIC OPERATION

1. This chapter discusses the purpose and role of each of the stitcher's functions, and the prin-
ciples of operation used for the stitcher 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 stitcher, "1" indicates a high signal voltage level, while
"0" indicates a low signal voltage level. Voltage values differ according to the circuit.
A microprocessor is used on the stitcher. A description of microprocessor operation is omitted
in this chapter as it is practically impossible to check the internal operation of the microproces-
sor.
Descriptions in this chapter also assume that PCBs will not be repaired at user sites. For this
reason, descriptions of circuits on PCBs are limited to block diagrams. Two types of block
diagrams 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 Stitcher 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
C. Controlling the Movement of
Sheets ................................ 3-21
D. Aligning the Sheets ............ 3-23
E. Controlling the Phase of the
Crescent Roller .................. 3-26
IV. STITCHING SYSTEM .............. 3-29
V . FOLDING/DELIVERY
SYSTEM .................................. 3-32
VI. CHECKING FOR A JAM .......... 3-40
VII. POWER SUPPLY ..................... 3-45