Incremental printing of symbolic information – Ink jet – Housing
Reexamination Certificate
2003-05-22
2004-12-07
Do, An H. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Housing
C347S104000, C400S691000, C271S104000, C271S121000
Reexamination Certificate
active
06827436
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a serial type recording apparatus. More particularly, the invention relates to an ink jet recording apparatus using for the ink jet head thereof an ink jet recording head that performs recording by discharging liquid, such as ink.
2. Related Background Art
For the recording apparatus, which is used as a printer, a recording unit for a copying machine or the like, it is generally practiced to adopt a serial type recording apparatus, that is, the one structured to record images on a recording medium in such a manner that while a sheet type recording medium, such as a recording paper sheet, or an OHP sheet, is being pinched for conveyance, the recording head, which is arranged on the carrying path of the recording medium, is allowed to scan. Of the recording apparatuses of the kind, the recording apparatus that uses the ink jet recording method makes running costs lower with a lesser amount of noises. Also, with such advantages that the apparatus can be downsized and arranged for color use with ease, it is used widely in general.
For the ink jet recording apparatus, the mechanism that conveys a recording medium while pinching it, the mechanism that records on the recording medium, the mechanism that expels the recording medium after the completion of recording, and the like are disclosed in the specifications of Japanese Patent Application Laid-Open No. 2001-246759 and others, for example. FIG.
9
and
FIG. 10
are views that schematically illustrate the conventional example of such ink jet recording apparatus.
FIG. 9
is a side view that schematically shows the entire body of the ink jet recording apparatus.
FIG. 10
is a perspective view that shows the printer unit
520
that forms the principal part of this ink jet recording apparatus. Here, for convenience's sake, the description will be made with the assumption that the side having a sheet-expeller tray
518
provided for the apparatus is in the front in the descriptions given below.
The printer unit
520
is formed by a plate member having a rear wall that expands almost at right angles to the bottom face of the bottom case
519
, that is, the installation face of the recording apparatus, and side walls formed by folding the edge portions on both sides of this rear wall. It has the chassis
501
in the U-letter form as a whole (see FIG.
10
). The chassis
501
is fixed to the bottom case
519
(see FIG.
9
). Between the side walls of the chassis
501
, there are supported the guide shaft
504
almost in parallel to the bottom face of the bottom case
519
. With the guide shaft
504
, and a guide portion arranged on the upper end of the chassis
501
, a carriage
506
is supported to be able to reciprocate almost in parallel to the bottom face of the bottom case
519
. For the carriage
506
, a driving belt
510
is connected to enable the carriage
506
to reciprocate when the driving belt
510
moves circularly by means of a CR motor (not shown).
The carriage
506
has a recording head
508
mounted thereon in such a manner that the discharge port formation surface of the recording head is placed downward with the portion where the discharge port formation surface is provided is extruded downward. On the face of the carriage
506
on the rear side, there is provided a base plate
534
having the circuit that controls the operation of the recording head
508
arranged therefor. In front of the rear sidewall of the chassis
501
, an encoder
507
is arranged in a stage of being biased. With this encoder
507
and a sensor (not shown) provided for the base plate on the carriage, the position of the carriage
506
is detected. The positional signal thus detected for the carriage
506
is utilized for the operational control of the carriage
506
, and the recording head
508
as well.
On the backside of the chassis
501
, an automatic sheet-feeding unit
517
is arranged on the bottom case
519
. The automatic sheet-feeding unit
517
is provided so as to enable a pressure plate
426
and a sheet-feeding tray
527
to stand diagonally backward, on which plural sheets of recording medium
524
are stacked. The pressure plate
526
is fixed to the ASF base
525
, which is installed on the bottom case
519
rotatively around the upper edge portion of the pressure plate
526
, and the lower edge portion thereof is rotatively biased in the direction toward the front (in the clockwise direction in FIG.
9
). Then, the sheet-feeding roller
528
, which is axially and rotatively supported to the ASF base
525
, is arranged in a position where the lower edge portion of the stacked recording medium
524
is pressed by the pressure plate
526
thus rotatively biased. A separation roller
529
is arranged in a position opposite to the sheet-feeding roller
528
.
The sheet-feeding roller
528
is connected with a driving source (not shown), and it is driven to rotate for feeding a recording medium
524
when the recording operation begins. The pressure plate
526
is structured so that it is interlocked with the sheet-feeding roller
528
by means of a cam (not shown). Then, when a feeding is executed, it presses the recording medium
524
to the sheet-feeding roller
528
, and on standby, it is pushed back against the biasing force given to it in the direction in which the lower edge portion thereof is placed backward. Therefore, on standby, the recording medium
524
can be stacked on the pressure plate
526
or removed freely. The recording medium thus stacked is held in a state where the lower edge thereof abuts against the rib, which is arranged for the ASF base
525
.
At the time of sheet feeding, the separation roller
529
operates so that the recording medium
524
on the separation roller side is not allowed to be fed any further when plural sheets of recording medium
524
are inserted into a nip between the separation roller
529
and the sheet-feeding roller
528
. Then, the recording medium
524
is separated and fed one by one from the automatic sheet-feeding unit
517
.
In a location where the front edge of a recording medium
524
to be fed is bitten, there are arranged in the positions each other, the carrier roller
502
and the pinch roller
503
, which are axially supported to rotate, respectively. The carrier roller
502
is axially supported by the bearings
512
formed on the sidewalls of the chassis
501
, respectively. The pinch roller
503
is fixed to the pinch roller holder
513
, which axially supports the pinch roller
503
on one end side, while being axially and rotatively supported between the sidewalls of the chassis
501
on the other end side. The pinch roller holder
513
is rotatively biased whereby to press the pinch roller
503
to the carrier roller
502
.
The carrier roller
502
is connected with an LF motor (not shown), and the recording medium
524
, which is pinched in the nip between the carrier roller
502
and the pinch roller
503
, is conveyed by the rotation of the carrier roller
502
. In this way, the recording medium
524
is conveyed in the sub-scanning direction intersecting with or orthogonal, in particular, to the main scanning direction in which the carriage
506
reciprocates.
Underneath the passage where the recording medium
524
is conveyed in such a manner, a platen
516
is arranged in a position opposite to the discharge port formation surface of the recording head
508
on the carriage
506
that reciprocates. The platen
516
is axially supported to rotate between the sidewalls of the chassis
501
. In front of the platen
516
, there are arranged the sheet-expeller roller
511
and the spur
514
, which are axially supported to rotate, respectively. The spur
514
is biased by means of a spring toward the sheet-expeller roller
511
. The sheet-expeller roller
511
is axially supported by a member that forms the platen
516
, and then, connected with the LF motor through gears (not shown) so that it is interlocked with the carrier roller
502
. The passage of the recording m
Nishiberi Nozomu
Nitta Tetsuhiro
Sonoda Shinya
Canon Kabushiki Kaisha
Do An H.
Fitzpatrick ,Cella, Harper & Scinto
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