Power stapler

Details Power stapler Power stapler

2001-04-30

2003-04-15

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With control means responsive to sensed condition

Work-responsive

C227S131000, C227S155000

Reexamination Certificate

active

06547119

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a stapler powered by a motor and the punching member is connected by two arms which are moved by a cam device so that the lowering action of the punching member is evenly and in stable.
BACKGROUND OF THE INVENTION
A conventional power stapler
70
is shown in
FIGS. 6 and 7
and generally includes a punching member
76
which is pivotally connected to an inside of an arm of the stapler
70
and staples are received in the punching member
76
. A motor
71
is connected in the power stapler
70
and is connected to a gear system
72
. A pinion T
7
driven by the motor
71
is connected to a gear T
8
and a gear disk T
10
is co-axially connected to the gear T
8
and drives gear T
9
. A gear disk T
11
is co-axially connected to the gear T
9
and drives a gear disk T
12
. A shaft
73
extends from a side of the gear T
12
and a cam shaft
74
is connected to the shaft
73
. A cam
75
is connected to the cam shaft
74
and is retained in a semi-circular frame
77
and when the cam
75
is at its high position, the punching member
76
is positioned at not-in-use position. When documents are inserted into the space below the punching member
76
, the cam
75
is moved to its lowest position by the gear system
72
to press the punching member
76
downward and penetrate a staple through the documents. However, the cam
75
contacts a side on the top of the punching member
76
so that the punching member
76
is applied an eccentric force which tends to tort the punching member
76
and the force of the two ends of the staple are not evenly. Because the cam shaft
74
is cantilevered so that it is worn out and/or deformed after being used for a long period of time. The contact between the cam
75
and the punching member
76
is an impact type that accelerates the deformation of the cam shaft
74
.
The present invention intends to provide a power stapler wherein the punching member is connected between two arms and two cam devices are connected on two distal ends of the two arms so that the punching member can be smoothly lowered and raised.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a power stapler and includes a base and a punching arm is pivotally connected to said base in which a gear system and a motor powering the gear system are received. A punching member has an end pivotally connected to said base and a punching plate extends from the other end of said punching member. A shaft extends through said punching member and two arms each have a first end thereof connected to two ends of said shaft. Two cam devices are respectively connected to two respective second ends of said two arms. The two cam devices are connected to an axle of one gear of said gear system so that when the gear is rotated, the cam devices moves the two arms.
The primary object of the present invention is to provide a power stapler wherein the punching member is connected between two arms which have two respective cam devices connected with the gear system so that the punching member can be pivoted smoothly and in stable.


REFERENCES:
patent: 5029745 (1991-07-01), Akizawa et al.
patent: 5222645 (1993-06-01), Sueda
patent: 5427296 (1995-06-01), Chen
patent: 5474222 (1995-12-01), Kanai et al.
patent: 5657918 (1997-08-01), Shimomura et al.
patent: 5791544 (1998-08-01), Fujimaki
patent: 5803337 (1998-09-01), Fukai et al.

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