Sharp AR-PN4 (serv.man2) Service Manual ▷ View online
3-27
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
Alignment plates
Crescent roller
phase sensor(PI12S)
phase sensor(PI12S)
If the crescent roller
was in contact with the
stack, alignment opera-
tion could be obstruct-
ed.
was in contact with the
stack, alignment opera-
tion could be obstruct-
ed.
Sensor flag
Crescent roller
Figure 3-318
Alignment operation is
started when the flag has
covered the sensor and
the crescent roller is
away from the stack.
started when the flag has
covered the sensor and
the crescent roller is
away from the stack.
Figure 3-319
Crescent roller phase
sensor (PI12S)
sensor (PI12S)
First sheet
Second sheet
Feed motor
stops
stops
Alignment operation
Feed motor (M1S)
Figure 3-320
3-28
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
IV. STITCHING SYSTEM
1.
Outline
The stitching system “stitches” the center of an output stack with staples.
To enable stitching at two locations on a stack, two stitcher units (front, rear) are used. Each
To enable stitching at two locations on a stack, two stitcher units (front, rear) are used. Each
stitcher unit is equipped with a stitcher motor (M7S, M6S) for drive, a stitcher home position
sensor (MS7S, MS5S) for detection of position and a staple sensor (MS6S, MS4S) for detection of
the presence/absence of staples.
sensor (MS7S, MS5S) for detection of position and a staple sensor (MS6S, MS4S) for detection of
the presence/absence of staples.
The stitcher base is designed so that it may be drawn out to the front from the saddle stitcher for
replacement of the staple cartridge or removal of a staple jam. The stitcher unit in sensor (PI16S) is
used to make sure that the stitcher base is properly fitted to the saddle stitch unit.
used to make sure that the stitcher base is properly fitted to the saddle stitch unit.
Safety switches are not mounted for the saddle stitch unit (front, rear), as the location does not
allow access by the user.
Stitcher (rear)
Stitcher (front)
Stack
Figure 3-401
3-29
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2.
Stitcher Unit Operation
The stitcher base unit consists of two stitchers and stitcher bases. The stitchers are fixed in
position, and are not designed to slide or swing.
Stitching is executed by driving the rotary cam by the stitcher motor (M7S, M6S). The front
and rear stitcher units are operated with a time delay so as to prevent wrinkling of paper and to limit
the load applied to the power supply. (A time delay for initiating the stitcher motor startup current
helps decrease the load on the power supply.)
the load applied to the power supply. (A time delay for initiating the stitcher motor startup current
helps decrease the load on the power supply.)
The stitcher home position sensor (MS7S, MS5S) is used to monitor the movement of the
rotary cam, enabling identification of individual stitcher operations. The presence/absence of staples
inside the staple cartridge fitted to the stitcher is detected by the staple sensor (MS6S, MS4S).
inside the staple cartridge fitted to the stitcher is detected by the staple sensor (MS6S, MS4S).
The alignment plates keep both edges of the stack in place while stitching takes place.
Figure 3-402
(MS7S)
(MS5S)
(PI18S)
Stitcher home position sensor
(front)
(front)
Stitcher motor (front) (MS7)
Stitcher motor (rear) (M6S)
Stitcher home position
sensor (rear)
sensor (rear)
No.1 paper sensor
Alignment motor (M5S)
Alignment
Escape
Figure 3-403
3-30
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
Cam
Mount
Figure 3-404
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