Sharp AR-F12 (serv.man4) Service Manual ▷ View online
3-8
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
II. FEEDING/DRIVE SYSTEM
A.
Outline
The stitch unit aligns the sheets coming from the finisher unit and stitches the resulting stack for
delivery to the delivery tray according to the commands coming from the finisher controller PCB.
The machine’s operation consists of the following:
1. Receive sheets.
2. Aligns the sheets
3. Stitches the stack.
4. Feeds the stack.
5. Folds and delivers the stack.
2. Aligns the sheets
3. Stitches the stack.
4. Feeds the stack.
5. Folds and delivers the stack.
1) Receive sheets
4) Feeds the stack
3) Stitches the stack
5) Folds and
delivers the stack
delivers the stack
2) Aligns the sheets
Figure 3-201
3-9
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
1.
Receiving Sheets
The stitch unit receives sheets from the finisher unit and outputs them inside the vertical path in
vertical orientation.
The vertical path, while sheets are being output, is configured by two paper deflecting plates.
The position of the sheets being output is set by the paper positioning plate so that the center of
The position of the sheets being output is set by the paper positioning plate so that the center of
the stack matches the stapling/folding position.
Sheets coming later are output closer to the delivery slot, and the volume of paper that may be
output is as follows:
●
15 sheets (maximum of 14 sheets of 80 g/m
2
+ 1 sheet of 256 g/m
2
)
Paper positioning plate
First sheet
Second sheet
Direction of
delivery
delivery
Figure 3-202
3-10
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2.
Aligning the Sheets
The alignment plates operate to put the sheets in order each time a sheet of paper is output to the
vertical path assembly. The alignment plates are mounted at the edge of the vertical path assembly.
The alignment plates also operate after stapling to prepare the stack for delivery.
Sheets
Paper positioning plate
Alignment plate
Alignment plate
Figure 3-203
3-11
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
3.
Stitching
When all sheets have been output, the two stitchers stitch the stack. The stitchers are positioned
so that they face the center of a stack.
The two stitchers are not operated simultaneously so as to prevent the paper from wrinkling
between two staples and to limit the load on the power supply.
If only one sheet of paper arrives from the host machine, stitching does not take place and the
sequence goes to the next operation (stack feeding).
Stitcher
Staple
Figure 3-204
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