Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Reexamination Certificate
1998-11-27
2001-08-07
Peterson, Kenneth E. (Department: 3724)
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
C083S628000, C083S859000, C083S635000
Reexamination Certificate
active
06269721
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electric paper punch, and more particularly, to an electric paper punch comprising a reinforcement mechanism.
2. Description of the Prior Art
A standard paper punch uses a punch pin to punch holes through paper loaded in it paper slot. There are two kinds of paper punches: manual and electric. With the manual paper punch, a lever arm is depressed to punch holes through paper with the punch pin and the punch pin is rebounded by a spring attached to the punch pin when the lever arm is released. The amount of paper the manual paper punch can handle at once is directly related to the length of the lever arm. The longer the lever arm, the more paper can be accommodated. However, the spring must have great elasticity in order to allow the punch pin to return to its original resting position.
In a typical electric paper punch, the punch pin is advanced with an electric motor. Please refer to FIG.
1
and FIG.
2
.
FIG. 1
is a perspective diagram of a prior art electric paper punch
10
.
FIG. 2
is a perspective diagram of a connecting module
12
of the electric paper punch
10
in FIG.
1
. The electric paper punch
10
comprises three connecting modules
12
. Each connecting module
12
comprises an opening
16
at its front end for supporting a punch pin
18
, an eccentric wheel
19
installed above a bottom side of the connecting module
12
, and an arc-shaped wall
14
at a rear end of the connecting module
12
.
During operation, the eccentric wheel
19
pushes the connecting module
12
and punch pin
18
forward to punch holes in paper placed in the paper slot
17
. Then, the eccentric wheel
19
will push the arc-shaped wall
14
of the connecting module
12
back. Because the rear end of the punch pin
18
is connected with two sides of the opening
16
of the connecting module
12
, the connecting module
12
will pull the punch pin
18
back at the same time. However, this backward force may cause distortion of the arc-shaped wall
14
of the connecting module
12
.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide an electric paper punch comprising a reinforcement mechanism to solve the mentioned problem.
Briefly, in a preferred embodiment, the present invention provides an electric paper punch comprising:
a housing;
a punch module for punching a hole in papers comprising a punch base fixed in the housing with a paper slot for loading papers to be punched, and a punch pin slidably installed in the punch base for punching a hole through the papers loaded in the paper slot;
an axle rotatably installed in the housing comprising an eccentric wheel for driving the punch pin forward and backward;
a connecting module installed in the housing under the eccentric wheel in a forward-and-backward slidable manner, the connecting module comprising a front end connected to a rear end of the punch pin, a wheel groove positioned under the eccentric wheel for allowing the eccentric wheel to rotate in it, and an arc-shaped wall forming a rear end of the wheel groove wherein the punch pin and the connecting module will be driven forward to punch the papers in the paper slot when the eccentric wheel is rotated forward within the wheel groove, and the arc-shaped wall will be pushed backward by the eccentric wheel to move the connecting module and the punch pin away from the paper slot when the eccentric wheel is rotated backward; and
a motor installed in the housing for rotating the axle so as to rotate the eccentric wheel forward and backward;
wherein the connecting module further comprises a reinforcement mechanism for strengthening the arc-shaped wall of the connecting module so as to avoid distortion of the arc-shaped wall caused by pulling the punch pin backward away from the paper slot.
It is an advantage of the present invention that the electric paper punch according to the present invention has a reinforcement mechanism that prevents distortion of the connecting module and can punch holes through more paper at once.
These and other objects and the advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
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patent: 5588344 (1996-12-01), Chun
patent: 5664473 (1997-09-01), Huang
Hsu Winston
Peterson Kenneth E.
Primax Electronics Ltd.
Tran Kim Ngoc
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