SHARP SP1725 Technical Report
Date: Mar. 31, 1994
OPTION: SF-S52
No. : SP-1725
SF-S52
TROUBLE SHOOTING STAPLE FEEDING TROUBLE IN
THE STAPLE UNIT.
The problem of staple feeding in the staple unit of model SF-S51 was reported in
technical report no. SP-1660, but the same problem has occurred in model SF-S52 and
is hereby reported.
1.General: The staple opening of the face plate was too small, and staples sometimes could not
pass through during staple mode operations (staple sort, and manual staple
operations). The trouble shooting measures described below are requested.
2.Cause: Due to staple unit face plate parts irregularities, the staple opening was too small,
causing the resistance during staple feeding to be too strong for the staples to pass
through (A change in the face plate metal pattern was carried out in 1993 March, but
dimension variance in the metal pattern occurred).
Former
Driver plunger
Body
Front sheath
Face plate
Location where the
dimension variance
occurred in the staple
opening.
3.Description:
SHARP CORPORATION Reprography Division
In order to maintain the proper staple opening dimensions in the face plate, finishing
(polishing) of the metal pattern has been added.
Note: The feeder of model SF-S52 is different in shape from the feeder used in model
SF-S51. The driving power is about the same as the new type of feeder used in
model SF-S51, but for interchangeability with the SF-S51, the feeder of model
SF-S52 has been changed to the new type of feeder used in the SF-S51.
1/7
Green
C
4.Action: (Factory action)
From 1993 December production.
How to read the manufacturing number of model SF-S52.
???
Old New
DC
Maker code Date
=
2 1992
=
3 1993
=
4 1994
Serial number
(Interchangeable with model SF-S51)
=
1 to 9 January to September
=
0 October
=
X November
=
Y December
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(Field action)
When the trouble described above occurs, The face plate and M shaped spring should
be replaced.
(Replacement parts).
• Face plate (polished).
• M shaped spring (once removed, the spring may become deformed and so a new
spring should also be replaced).
* As previously explained, the driving power of the feeder is the same for both old and
new models, and it is therefore not necessary to replace it.
Questions concerning replacement parts should be directed to the Product Quality
Control Section of the Copier Operations Division.
How to replace the face plate and the M-spring
When disassemble the stapler
1. Remove the stapler from the sorter.
2. Raise the cartridge spring (cf. Fig. 1), and remove the staple cartridge.
3. Pull out the body pin, and remove the feeder.
It has set direction.
Caution: The body pin has to be pulled out in one direction only as follows.
Lay down the stapler, and pat the body pin on the right side. Pull out the body pin in direction A as Fig. 1.
Using the plier (or the minus screwdriver), hold head of the body pin.)
And pat the plier (or the minus screwdriver).
body pin
rib
direction of pulling
B
cover
A
head of
body pin
(pat here)
anvil guard
remove the staple
cartridge upward
cartridge spring
install the staple
cartridge lower
feeder
Fig.1.
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