Stapler with braking mechanism

Details Stapler with braking mechanism Stapler with braking mechanism

2001-06-21

2003-09-30

Rada, Rinaldi I. (Department: 3721)

Elongated-member-driving apparatus

With means to support member and/or work relative to driver

Work support

C227S131000, C227S002000

Reexamination Certificate

active

06626348

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor-operated stapler having a driver which reciprocates and drives out a staple toward a sheet bundle.
2. Description of the Prior Art
Heretofore, such a motor-operated stapler as shown in
FIG. 11
has been known. This known stapler is provided with a forming plate
1
for forming a staple in U shape, a driver
8
for driving out the U-formed staple toward a sheet bundle
2
, a link mechanism
4
which causes the forming plate
1
and the driver
3
to reciprocate, and a table having a clincher (not shown) for clinching leg portions of the staple which has pierced the sheet bundle
2
.
The link mechanism
4
has a link cam
6
mounted on a driving shaft
5
and a link member
8
mounted pivotably between a pair of frames
7
. At a rear portion of the link member
8
is mounted a roller R rotatably in abutment against the link cam
6
. The link member
8
is urged by means of a biasing member (not shown) in a direction in which the roller R is kept in abutment against the link cam
6
. With rotation of the link cam
6
, the link member
8
pivots about a shaft
8
A, as shown in FIG.
12
.
A shaft
9
is held in an elongated hole
8
B formed in a front end portion of the link member
8
. As the link member
8
pivots about the shaft
8
A, the shaft
9
moves vertically along elongated holes
7
A formed in the frames
7
. The forming plate
1
and the driver
3
are secured to the shaft
9
and move vertically with a vertical movement of the shaft
9
.
The link cam
6
is formed with a home position portion
6
A for keeping the forming plate
1
and the driver
3
located at their position (home position) shown in
FIG. 11
, an advancing portion
6
B for moving the forming plate
1
and the driver
3
downward and driving out a staple, a hold-down portion
6
C for holding down the driven-out staple, and a retreating portion
6
D for moving the forming plate
1
and the driver
3
upward. With one rotation of the link cam
6
, the forming plate
1
and the driver
3
reciprocate once up and down.
In such a conventional motor-operated stapler, plural cams, etc. other than the link cam
6
are mounted on the driving shaft
5
, so even when the motor turns OFF, the rotation of the driving shaft
5
does not stop immediately due to inertia for example. For this reason it has so far be necessary that the range of the home position portion (home position zone)
6
A be taken wide. For example, even with use of a motor brake or the like, one-ninth or more of the entire rotational angle (360°) of the link cam
6
is needed and a rotational angle (an angle falling under the range of the advancing portion
6
B) used for drive-out becomes narrower, thus giving rise to the problem that the rotational angle range used for other controls is narrowed.
Even if an attempt is made to rotate the link cam
6
with use of a dedicated motor as a separate drive source for diminishing inertia, a wide home position zone is required due to accumulation of accuracy errors in a transfer system for transferring the rotational force of the motor to the link cam.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a motor-operated stapler which permits narrowing the range of a home position zone of a cam.
According to the present invention there is provided a motor-operated stapler including a driver adapted to reciprocate and drive out a staple toward a sheet bundle and a drive mechanism for actuating the driver, the driver being reciprocated once with rotation of a driving cam mounted on a driving shaft in the drive mechanism, characterized by further including a brake means which brakes the rotation of the driving shaft mechanically when the driver returns to a home position thereof.


REFERENCES:
patent: 2770805 (1956-11-01), Elzer et al.
patent: 4623082 (1986-11-01), Kurosawa
patent: 4720033 (1988-01-01), Olesen
patent: 4726505 (1988-02-01), Okazaki
patent: 5007572 (1991-04-01), Chung-Cheng
patent: 5141143 (1992-08-01), Ebner et al.
patent: 5460314 (1995-10-01), Udagawa
patent: 5660314 (1997-08-01), Magnusson et al.
patent: 5702047 (1997-12-01), Yoshie
patent: 5791548 (1998-08-01), Udagawa et al.
patent: 5836502 (1998-11-01), Kanai et al.
patent: 0 844 053 (1998-05-01), None

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