SHARP SP1660 Technical Report

Date: Dec. 28, 1993

OPTION : SF-S51

No. : SP-1660

SF - S51
TROUBLE SHOOTING THE STAPLE DRIVE OF
THE STAPLE UNIT (BLANK SHOTS)

1.General: The opening in the faceplate for the staples is sometimes a little small, preventing the

staples from being driven properly when using staple modes (staple sort and manual
staple modes). By changing the shape of the feeder the staple driving force is
increased sufficiently so that the staples can be driven, even if the opening in the
faceplate should be a little small.

2.Cause: The opening for the staples is sometimes too small, due to manufacturing irregularities
in the parts of the staple unit face plate. This increases friction resistance, which
prevents the staples from being driven. (irregularities in the dimensions of the mold for
the faceplate occurred when it was renewed in March of 1993.)
Burrs (unpolished edges) sometimes remain on the staple openings of the faceplate
after manufacturing. The trouble mentioned above also occurs when the staples get
caught on these burrs.

* Dimension irregularities are the main cause of stapling trouble. Only a small

percentage of the stapling trouble is caused by burrs remaining on the staple opening
of the faceplates.

FRONT SHEATH

FORMER

DRIVER PLUNGER

FACE PLATE

Location of the staple opening
dimension irregularities.

BODY

SHARP CORPORATION Reprography Division

1/7

Green

C

3.Description: ➀ The shape of the feeder spring has been changed. This has improved the driving

power applied to the staples, enabling them to be driven with no problem, even if the
dimensions of the staple opening in the faceplate is small.

➁ Burr removal and rechecks of the faceplate.

* φ0.5 blue seal.

(Old type.) (New type.)

* To distingusish which units have had

these changes carried out, a blue seal
has been affixed.

4.Action: (Factory action)

From 1993 October production.

(Field action)

When trouble occurs, the feeder, faceplate and M-spring should be replaced.

(Replacement parts).

• Feeder (new type).

• Faceplate (properly finished, with burrs removed).

• M-spring (The spring may become deformed when removed, and should therefore be
replaced.)

In regard to the supply of these replacement parts, please contact PQA, Reprographic
Division.

2/7

of Countermeasure Parts for Staple Misfeeding Defect

replacemen t parts:

• FEEDER (a part to feed staple belt)

• FACE PLATE (a metal sheet attached to the body)

• M-SHAPED SPRING (a M-shaped wire spring)

Replacement Procedure

1. Disassemble of Stapler Unit

➀ Pull out BODY PIN toward the arrow mark direction in

Fig.1.
(If you try to pull it to revers e dir ection , it wi ll be s tuck
with ribs.)

• It mak es this operat io n easy to ta p the bot tom of
BODY PIN slight ly wit h any tool such as s crew

driver.

FEEDER is now rem ova ble from the st apler uni t.

FEEDER (current)

pulling direction

BODY PIN

M-SHAPED SPRING

Fig.1

rib

BODY PIN

➁ Remove M-SHAPED SPRING pulling both sides with

any tool such as flat s crew dri ver. (See Fi g.2.)
Also remove BENDING BLOCK at the same time.

•CAUTION!
Do not re-use this M-SHAPED SPRING since it might
be deformed for t his oper ati on.

flat screw driver

BENDING BLOCK

Fig.2

3/7