Printer for continuous paper

Details Printer for continuous paper Printer for continuous paper

1999-10-08

2002-03-05

Yan, Ren (Department: 2854)

Typewriting machines

Sheet or web

For feeding web record-medium

C400S621000

Reexamination Certificate

active

06352381

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a printer for a rolled paper in which a printed rolled paper is cut away for ticket issue.
In a conventional printer for the rolled paper, in order to mount the paper on the printer, it is necessary to nip an end portion of the paper between a print head and a platen roller. In order to facilitate the nipping of the paper, the print head is provided on a printer body and the platen roller is attached on a cover.
FIGS. 10 and 11
show the conventional printer.
Referring to
FIG. 10
, a print head
112
and a movable blade
120
c
of a paper cutter are mounted on a printer body
101
. A platen roller
116
for pressing the paper of a rolled paper
124
against the print head
112
and a fixed blade
120
b
to be engaged with the movable cutter
120
c
are mounted on a cover
105
.
The rolled paper
124
is mounted on the printer body
101
, and a paper end portion
124
a
is pulled out of a paper discharge opening
106
, and then the cover
105
is rotated in the direction of an arrow F to close the printer body
101
.
FIG. 11
shows the closed state. The paper
124
is nipped by the print head
112
and the platen roller
116
, and the paper end portion
124
a
is pulled out of the paper discharge opening
106
passing through the gap between the fixed blade
120
b
and the movable blade
120
c.
This printer has an advantage that the paper can be easily attached to the machine. However, since the print head and the platen roller are separately mounted on the cover and the print body, it is difficult to securely keep the contact of the print head with the platen roller. Since the fixed blade and the movable blade are separated, it is difficult to keep the engagement accuracy. Furthermore, since the fixed blade and the movable blade are positioned near the paper discharge opening, there is a danger of contacting and injuring of user's fingers when mounting the rolled paper. In addition, the print head is exposed when the cover is opened. As a result, if user's fingers contact with the print head, the fingers may have a burn.
The printer shown in
FIGS. 12 and 13
is made to obviate the above described disadvantages and dangers.
Referring to
FIG. 12
, a cover
205
is pivotally mounted on a printer body
201
. On the printer body
201
, there is mounted a print head
212
, a platen roller
216
pressed against the print head
212
for feeding paper
224
, and a cutter
220
for cutting away the paper
224
. The cutter
220
comprises a fixed blade
220
b
and a movable blade
220
c
. A paper inserting opening
220
a
is formed between the fixed and movable blades.
As shown in
FIG. 12
, the paper
224
is mounted on the printer body
201
, a paper end portion
224
a
is inserted between the print head
212
and the platen roller
216
in the direction of an arrow {circle around (
1
)}, and the platen roller
216
is rotated in the direction of an arrow H to feed forward the paper, thereby inserting the paper end portion
224
a
in the paper inserting opening
220
a
of the cutter
220
. The paper is further fed to be discharged from a paper discharge opening
206
as shown by an arrow {circle around (
2
)}, and the cover
205
is closed in the direction of an arrow G as shown in FIG.
13
.
Although the printer resolves the problems of the printer of
FIGS. 10 and 11
, it is troublesome to set the paper in the printer.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a printer in which the paper can be easily set without injuring the user's fingers.
According to the present invention, there is provided a printer having a printer body and a cover rotatably mounted on the printer body, comprising, a paper holding portion provided in the printer body for holding paper, a paper discharge opening formed between the printer body and the cover at a front portion of the printer, a paper cutter comprising a fixed blade and a movable blade and provided in the printer body adjacent the paper discharge opening, a print head provided in the printer body adjacent the paper cutter, a platen roller rotatably mounted on the printer body and contacted with the print head, a pressure roller rotatably mounted on the cover so as to be pressed against the platen roller when the cover is closed, the paper discharge opening, paper cutter, and platen roller being disposed so that the paper is pulled out from the paper discharge opening passing over the platen roller and between the fixed and movable blades.
The printer further comprises a return paper receiving space formed between the platen roller and the paper holding portion.
A paper set detector is provided adjacent the print head, and a control circuit is provided for receiving a paper set signal from the paper set detector and for starting the platen roller rotating in the paper return direction so as to return the paper nipped between the platen roller and the pressure roller.
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.


REFERENCES:
patent: 4592669 (1986-06-01), Lohse et al.
patent: 4641980 (1987-02-01), Matsumoto et al.
patent: 5244295 (1993-09-01), Terashima et al.
patent: 5490735 (1996-02-01), Brandenburg et al.
patent: 5713679 (1998-02-01), Taylor
patent: 5727889 (1998-03-01), Koyabu
patent: 5779371 (1998-07-01), Aoyama et al.
patent: 5988903 (1999-11-01), Baitz et al.
patent: 5993093 (1999-11-01), Schoennauer et al.
patent: 6022158 (2000-02-01), Nakayama et al.
patent: 6030133 (2000-02-01), Endo

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