Elongated-member-driving apparatus – With means to cut member after penetration
Reexamination Certificate
1999-10-19
2001-06-26
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to cut member after penetration
C227S155000
Reexamination Certificate
active
06250531
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric stapler. More specifically, the present invention relates to a cutting mechanism for an electric stapler in which unnecessary portions of the leg portions of a staple, which pass through and are projected from an object to be stapled, are cut after the leg portions are bent inward.
2. Description of the Related Art
To staple a large number of sheets (for example, 100 sheets), a staple of which the crown portion is wide and the leg portions are long is generally used. When a small number of sheets are stapled with the same type of staple and the leg portions of the staple are bent, the leg portions are overlapped each other. In order to prevent the leg portions from being overlapped, a mechanism is known in which leg portions of a stapler are clinched after necessary portions of the leg portions for stapling, which pass through and are projected from the reverse side of a stapled object, are left and the rest of the leg portions are cut away. The above cutting mechanism, as shown in
FIGS. 12A and 12B
, includes a couple of support plates
30
for rotatably supporting movable clinchers (not shown). A cutter
31
is disposed at an intermediate portion of the couple of support plate
30
in a state that it is movable in the direction at a right angle with the support plates. The cutter
31
includes an opening
33
allowing the leg portions
32
of a staple to pass therethrough. The leg portions
32
of the staple, after they pass through a stapled object
34
, are inserted into the space between the support plates
30
, and pass through the opening
33
. In this state, the cutter
31
is moved to cut away unnecessary portions of the leg portions
32
of the staple, as shown in FIG.
12
C.
However, in the conventional cutting mechanism, when the leg portions of the staple are cut as described above, the corners
35
of the leg portions are formed at a substantially right angle. Therefore, as shown in
FIG. 12D
, when the stapling work ends and a stapled booklet is, for example, laid on top of another, there is a danger that the corners
35
of the leg portions of one booklet scratch the surface of the paper of another laid booklet
34
a.
Accordingly, an object of the present invention is to provide a cutting mechanism for leg portions of staples in use with an electric stapler which is free from the above problem that the leg portions of a staple scratch or break the surface of another stapled object.
SUMMARY OF THE INVENTION
In order to attain the above object, the present invention provides an electric stapler for binding a material with a staple comprising a driver, a cutter, and a clincher. The driver engages the staple and drives leg portions of the staple through the material to be bound. The cutter cuts the leg portions of the staple in a predetermined length and forms a cut surface in each of the leg portions. The cut surface forms an obtuse angle where the cut surface and an outer surface of the leg portions meet each other. The clincher bends the leg portions of the staple after the leg portions piercing the material to be bound are cut.
Further, it is preferable that curved plates are disposed under the cutter, and the leg portions of the staple are bent inward by the curved plates, and then the leg portions are cut.
Moreover, it is more preferable that the leg portions of the staple are cut with a U-shaped or V-shaped cutter.
REFERENCES:
patent: 4378085 (1983-03-01), McVeigh
patent: 4644634 (1987-02-01), Jackson
patent: 4811884 (1989-03-01), Sato
patent: 4844319 (1989-07-01), Kurosawa
patent: 6036074 (2000-03-01), Manabe
patent: 6059504 (2000-05-01), Ishida et al.
Max Co. Ltd.
Morgan & Lewis & Bockius, LLP
Smith Scott A.
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