Paper cutting device

Details Paper cutting device Paper cutting device

2001-08-27

2004-08-31

Gerrity, Stephen F. (Department: 3721)

Cutting

Rotatable disc tool pair or tool and carrier

Carrier for rotatable tool movable during cutting

C083S487000, C083S614000

Reexamination Certificate

active

06782784

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a paper cutting device for a printer, ticket vendor and others.
As a conventional paper cutting device, there is known a device in which a movable cutter having a disc shape is rolled on a straight fixed cutter so as to cut a paper sheet.
FIGS. 16 and 17
show the conventional paper cutting device. An elongated fixed cutter
102
is in a frame
101
, and a movable cutter disc
103
is rotatably supported in a cutter carrier
104
and mounted on the fixed cutter
102
. The cutter carrier
104
is slidably mounted on a carrier feed shaft
105
having a feeding spiral groove
105
a
and a returning reverse spiral groove
105
b.
The underside of the cutter carrier
104
contacts with an end of a detector lever
107
at the illustrated home position. The other end of the detector lever
107
is connected with a detector
106
. The detector
106
generates a signal which is applied to a control circuit (not shown) for informing that the cutter carrier
104
is located at the home position.
Referring to
FIG. 17
, a gear
112
secured to the left end of the feed shaft
105
is connected to an output shaft
108
a
of a carrier feeding motor
108
through gears
111
,
110
and a gear
109
secured to the output shaft
108
a.
When a paper sheet is cut, the paper sheet is put on the fixed cutter
102
, and the motor
108
is operated to rotate the carrier feed shaft
105
. At the home position, the cutter carrier
104
engages with the feeding groove
105
a
. Consequently, the cutter carrier
104
is fed to the right to rotate the movable cutter disc
103
. Thus the paper sheet is cut by the movable cutter disc
103
and the fixed cutter
102
.
When the cutter carrier
104
arrives the right end, the cutter carrier
104
is engaged with the returning groove
105
b
. Thus, the cutter carrier
104
is fed to the left. When the cutter carrier
104
arrives the home position, the motor
108
is stopped by the operation of the control circuit dependent on the operation of the detector lever
107
and the detector
106
.
In the conventional device, the cutter carrier
104
slides on the feeding groove
105
a
or the returning groove
105
b
of the feeding shaft
105
during the cutting operation. Consequently, there is large frictional resistance between the cutter carrier
104
and the feeding shaft
105
, thereby increasing the load on the carrier feeding motor
108
and generating large noises. In addition, it is necessary to perform a number of processing steps to manufacture the feeding groove and the returning groove of the feeding shaft
105
, which causes the manufacturing cost to increase.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a paper cutting device which is small in frictional resistance and in noise and which may be manufactured at a low cost.
According to the present invention, there is provided a paper cutting device comprising a frame, a straight fixed cutter mounted on the frame, a movable cutting carrier slidably supported on the frame to be moved along the fixed cutter, a movable cutter having a disc shape and rotatably mounted on the carrier, and contacted with the fixed cutter at a side surface thereof, a movable cutter rotating roller rotatably mounted on the movable cutter carrier and resiliently contacted with the movable cutter at a side surface thereof and with the fixed cutter, a carrier feeding endless belt provided in the frame along the fixed cutter, a carrier connecting member operatively connecting the movable cutter carrier with the endless belt, a belt driving motor, a power transmitting device for transmitting the power of the motor to the endless belt for driving the endless belt, whereby the movable cutter carrier is moved by the endless belt, and the movable cutter is rotated along the fixed cutter so as to cut a paper sheet mounted on the fixed cutter.
The device further comprises a shaft mounted on the movable cutter carrier, a movable cutter cylindrical holder mounted on the shaft, and a holding member mounted on the movable cutter cylindrical holder, the movable cutter rotating roller being mounted on the holding member.
A fixing projection is formed on a peripheral portion of the belt for connecting the carrier with the belt.
The movable cutter rotating roller urges the movable cutter to a flange formed on the movable cutter cylindrical holder to hold the movable cutter.
The carrier connecting member has a cylindrical projection slidably engaged with a vertical elongated hole formed in the movable cutter carrier, and engaged with the fixing projection on the belt.
A spring is provided between an inside wall of the carrier and the movable cutter cylindrical holder for pressing the movable cutter against the fixed cutter.
These and other objects and features of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings.


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