JPH0386568A - Recorder - Google Patents

Abstract

PURPOSE:To feed a sheet material without the possibility of curling by mounting a belt-form platen unit for supporting and feeding the sheet material opposedly to a recording head. CONSTITUTION:With the input of a feed instruction for a sheet material S, a CPU 14 starts a platen drive motor driver 20 to drive a platen roller unit 4, whereby the sheet material S is intermittently fed by every one-line recording. The recorded sheet material S is discharged to a stacker 13 on the downstream side along a feed direction. At this time, even when the trailing end of the sheet material S is disengaged from a platen feed roller 6, or the sheet material S loaded flatly on a belt 4c is pressed by a presser roller 7, without a curl recording can be applied to the rear end of the sheet material S. Because a part having a large curvature does not exist in a feed path of the sheet material S, the sheet material can be prevented from falling into habit of curling.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording apparatus having a platen roller, which is applied to, for example, printers, typewriters, facsimile printers, and the like.

<Prior Art> With the advancement and development of information processing technology in recent years, recording devices using various recording methods have been developed and put into practical use.

Among these, in a recording apparatus that employs a platen roller method, the sheet material is pinched by a platen roller and a feed roller that is pressed against the platen roller and rotates as a result of rotation, and conveyed to the recording section, and the sheet material after recording is transferred to the platen roller. The paper is wrapped around the paper and transported between a discharge roller and a pressing roller that presses the paper, and is discharged to the outside.

In the above device, the distance between the recording head and the feed roller is the guaranteed transport area for the trailing edge of the sheet material, and the trailing edge of the sheet material that leaves the feed roller may jump up due to the curvature of the platen roller and rub against the recording head. , there were cases where an error occurred in the conveyance amount of the sheet material.

Further, when a sheet material is conveyed by being pressed against an object having a small radius of curvature, such as a platen roller or a discharge roller, there is a possibility that a curl close to the curvature of the platen roller will be stored in the sheet material.

Furthermore, if recording is performed on the back side while the curl state is memorized, there is a risk that the image quality will deteriorate.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a recording device that does not memorize the curl state even when a sheet material is pressed and can stably convey the sheet material.

Means for Solving the Problems> Means for solving the problems of the prior art described above and applied to the embodiments described below include a recording head for recording on a sheet material according to image information, and a recording head for recording on a sheet material according to image information. and a belt-like platen unit for supporting and conveying sheet material provided opposite to the platen unit.

<Operation> According to the above means, since the belt-like platen unit for supporting and transporting the sheet material is provided facing the recording head, the sheet material can be transported without bending.

In particular, when the belt-like platen unit is configured by passing a belt between a driving roller and a driven roller, the sheet material can be supported and conveyed linearly, so the sheet material can be transported by the feed roller and the press roller. It is possible to prevent the sheet material from curling even when pressed.

Furthermore, when cardboard is used as the sheet material, bending of the paper can be effectively prevented.

Furthermore, since the sheet material can be conveyed without bending, the sheet material does not jump up even after it is released from the pressure of the feed roller, making it possible to record up to the trailing edge of the sheet material.

<Embodiment> Next, an embodiment of a recording apparatus to which the present invention is applied will be described with reference to the drawings.

FIG. 1 is a perspective explanatory view of a recording apparatus, and FIG. 2 is a block diagram showing a control system of the recording apparatus.

First, the general configuration of the recording apparatus will be explained with reference to FIG.

Reference numeral 1 denotes a recording head which is a recording means for recording an image on the sheet material S according to image information. The above recording head 1
The recording head chip has an ink ejection opening and an ejection energy generating element provided corresponding to the ink ejection opening, and an ink cartridge which is an ink supply source are integrated. The recording head 1 performs recording on a sheet material S by ejecting ink from the ink cartridge in accordance with an ejection signal corresponding to image information from a control circuit on the apparatus main body side (not shown).

The recording head 1 is mounted on a carriage 3 that can reciprocate on a guide shaft 2 by a drive means (not shown).

Reference numeral 4 denotes a belt-like platen unit for supporting and conveying the sheet material S provided facing the recording head 1.

The platen unit 4 is constructed by passing a belt 4c around a drive roller 4a that rotates around a drive shaft 4a, and an auxiliary roller 4b that rotates around an auxiliary shaft 4b.A platen drive motor is connected to the drive shaft 4a. By transmitting the driving force from 5, the driving roller 4a+ and the auxiliary roller 4
This is to rotate b+. The belt 4C has a pad 4d provided between the drive roller ayo and the auxiliary roller 4bl.
It is supported without any slack.

A platen feed roller 6 and a press roller 7 press the drive roller 4a+ and the auxiliary roller 4b+, respectively, via a belt 4C, and these rotate in synchronization with the rotation of the belt 4C.

Therefore, the sheet material S is conveyed while being pinched between the platen feed roller 6, the press roller 7, and the belt 4C.

A feeding roller 8 is a feeding means for feeding the sheet material S from the cassette 9 loaded with the sheet material S. A feed roller 10 and a pinch roller 11 that presses against the feed roller 10 and rotates as a result of rotation are provided downstream of the feed roller 8 in the sheet material conveyance direction (hereinafter simply referred to as "downstream side").
The fed sheet material S is guided along the guide member 12 to the recording section.

13 is a stacker for accommodating the sheet material S after recording.

Next, a block diagram showing the control system of the recording apparatus configured as described above will be explained with reference to FIG. 2.

14 is a CPU that controls the entire device. 15 is a ROM in which control programs and the like are stored. A RAM 16 is used for storing input data and the like and as a working storage area.

17 is an interface for inputting recording data and instructions for feeding the sheet material S from the host computer 18; 19 is a platen drive motor driver 20; a feeding motor driver 21. Feed motor driver 22, carriage motor driver 23. This is an interface for outputting control signals from the CPU 14 to the recording head driver 24 and the like.

Next, the operation of conveying the sheet material S when recording data and a feeding command for the sheet material S are input from the host computer 18 will be described.

Recorded data and sheet material S from the host computer 18
When the feeding command is input, the CPU 14 sends the platen drive motor driver 20 . Feeding motor driver 21. The feed motor driver 22 is activated to drive each platen roller unit 4. Feeding roller 8. Drive and rotate the feed roller IO. Cassette 9
The inner sheet material S is fed one by one to the downstream side by the feed roller 8, and is fed to the guide member 1 by the feed roller 10.
1 to the platen roller unit 4, and is conveyed to the recording position of the rad 1, where it stops.

Next, the recording data is stored in the buffer RAM 16, and when a recording start command is input, the carriage motor driver 23. The recording head driver 24 is driven to cause the carriage 3 to travel along the guide shaft 2, and recording is performed by ejecting ink from the recording head 1 onto the sheet material S according to image information.

Next, when a conveyance command for the sheet material S is input, the CPU
14 starts the platen drive motor driver 20 again to drive the platen roller unit 4 to intermittently convey the sheet material S for each line of recording. The sheet material S after recording is then discharged to the stacker 13 on the downstream side along the conveyance direction.

At this time, even if the rear end of the sheet material S leaves the platen feed roller 6, the sheet material S placed flat on the belt t-4c will not curl even if it is pressed by the presser roller 7. , recording can be performed up to the rear end of the sheet material S.

Furthermore, since there are no large curvature points during the conveyance process of the sheet material S, it is possible to prevent the sheet material from being curled.

Although the pad 4d is provided inside the belt 5 in the above embodiment, it can be omitted in a non-contact type recording apparatus such as an inkjet type recording apparatus.

Furthermore, although this embodiment has been described with respect to an inkjet type recording apparatus, it is also possible to apply the present invention to a type of recording apparatus such as a thermal transfer recording type or a thermosensitive type.

<Effects of the Invention> As described above, the present invention is provided with a belt-shaped platen unit for supporting and conveying the sheet material facing the recording head, so that the sheet material can be conveyed without bending.

In particular, when the belt-like platen unit is configured by passing a belt between a driving roller and a driven roller, the sheet material can be supported and conveyed linearly, so the sheet material can be transported by the feed roller and the press roller. It is possible to prevent the sheet material from curling even when pressed.

Furthermore, when cardboard is used as the sheet material, bending of the paper can be effectively prevented.

Furthermore, since the sheet material can be conveyed without bending, the sheet material does not jump up even after it is released from the pressure of the feed roller, making it possible to record up to the trailing edge of the sheet material.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory diagram of a recording apparatus, and FIG. 2 is a block diagram showing a control system of the recording apparatus. S is the sheet material, ■ is the recording head, 2 is the guide shaft,
3 is a carriage, 4 is a platen roller unit, 4a is a drive shaft, 4a is a drive roller 4b is an auxiliary shaft, 4b + auxiliary roller, 4c is a belt, 4d is a pad, 5 is a platen drive motor, 6 is a platen feed roller, 7 is a press roller, 8 is a feed roller, 9 is a cassette, 10 is a feed roller, 11 is a pinch roller, I2 is a guide member, 1
3 is stacker, 14 is CPU, 15 is ROM, 16 is R
AM, 17° 19 is an interface, 18 is a host computer, 20 is a platen drive motor driver, 21
22 is a feed motor driver, 23 is a carriage motor driver, and 24 is a recording head driver 24.

Claims (2)

[Claims] (1) A recording apparatus comprising: a recording head for recording on a sheet material according to image information; and a belt-like platen unit provided opposite to the recording head for supporting and conveying the sheet material. (2) Claim (1) wherein the belt-like platen unit is configured by a belt extending around a drive roller and an auxiliary roller.
) recording device.