JPS63183865A - Serial-type thermal recorder - Google Patents

Abstract

PURPOSE:To perform a prefect recording without reversing a recording sheet by providing recording heads on both surfaces of the recording sheet and permitting these heads to run a main scanning simultaneously. CONSTITUTION:A recording sheet 14 is transported by means of platens 9, 10, the front of the recording sheet 14 makes contact with the platen 9, while the rear of the recording sheet 14 touches the platen 10. If a recording start button is depressed and carriages 3, 7 are set to a start position, a recording head 5 is released with only a recording head 1 allowed to contact under pressure. Thus the head 1 heats an ink ribbon 16 in response to the record contents according to record information. This heated part sticks to the front of the recording sheet 14, fixing an image. After this, recording by the recording head 1 proceeds and the recording head 5 is set to a pressure contact state at a time when the tip of the recording sheet 14 is exposed between the platen 9 and the head 5. In this way, recording is performed on the front of the recording sheet 14 and at that time, the rear of the sheet is also recorded by the head 1 because the carriage 7 moves together with the carriage 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial type thermal recording apparatus that performs sub-scanning of a recording sheet and main scanning of a recording head to record on the recording sheet.

[Conventional technology]

Recording devices such as printers and facsimile machines selectively drive multiple dot-forming elements provided in the recording head based on recording information (image data) while printing dots on a recording sheet (a recording medium such as paper or a thin plastic plate). It forms a dot pattern.

The types of this recording device include a serial type that records while moving the recording head in the width direction of the sheet, a line print type that records one line at a time, and a page print type that records one page at a time. .

In addition, recording methods include thermal, inkjet, and wire dot types.The thermal type is further divided into the thermal transfer type, which uses an ink ribbon to transfer ink to a regular sheet, and the thermal type, which uses a thermal head to directly heat and color the heat-sensitive sheet. Can be divided.

The present invention is directed to a serial type thermal recording device.

FIG. 4 is a perspective view showing a serial type thermal recording device.

The platen 40 is constructed by attaching a cylindrical elastic member such as rubber to a shaft, and conveys the recording sheet 41 at a predetermined feed width. An ink ribbon 43 is disposed in the longitudinal direction of the platen 40 in close proximity to the recording sheet 4.
A thermal recording throat 42 is disposed so as to be movable along 3.

The recording head 42 is mounted on a carriage 44, and the carriage 44 is guided by a guide shaft arranged parallel to the platen 40, and reciprocates depending on the printing state.

In the above configuration, when recording, insert the recording sheet 41 from the back of the platen 40, expose the recording sheet 41 to the printing position, and press the recording start button (not shown) to move the carriage 44 to the recording start position (Fig. (towards the right in the figure). During this movement process, the recording nozzle 42 is driven based on the recording information, and the resistance heating element in the head selectively generates heat, melting the ink ribbon 43.
, recording sheet) 41 by applying molten ink to it. - When printing for one line is completed, the carriage 44 is returned to the starting end, and at the same time, the ink ribbon 43 is conveyed by one line of printing width in the direction of the arrow in the figure. Thereafter, the above-described process is repeated to sequentially perform recording.

[Problem that the invention seeks to solve]

However, such conventional serial type thermal recording devices use a single recording head to perform recording, so in order to record on both sides of the recording sheet, the recording sheet must be turned over. There are inconveniences that must be done. Furthermore, since it is possible to record only on one side, there is a problem that the printing speed is slow.

SUMMARY OF THE INVENTION An object of the present invention is to provide a serial type thermal recording device that can solve the problems of the prior art and can perform double-sided recording without turning over the recording sheet.

[Means for solving problems]

The present invention achieves the above object by disposing recording heads on both sides of a recording sheet and by scanning these heads at the same time to enable simultaneous recording on both sides of the recording sheet.

[Effect]

A plurality of recording heads arranged on both sides of the recording sheet are simultaneously main-scanned by a single drive source.

Since recording is simultaneously performed on the front and back sides of the recording sheet, the recording time is not reduced.

〔Example〕

The present invention will be specifically described below with reference to FIGS. 1 and 2.

FIG. 1 shows a side view of a serial type thermal recording device according to the present invention, and FIG. 2 shows a platen 9.1 from the device of FIG.
FIG. 2 is a perspective view showing a state in which the paper feed roller 1 and the paper feed roller 15 are removed.

In FIG. 1, a thermal type front surface recording head 1 for recording on the surface of a recording sheet 14 is mounted on a carriage 3 together with a front surface ink ribbon cassette 2. The carriage 3 moves in its longitudinal direction while being guided by the guide shaft 4. The recording sheet (14) is conveyed by the platen 9 and 10, and the recording head 1 is disposed opposite to the platen 10. The front surface of the recording sheet 14 is in contact with the platen 9, and the back surface of the recording sheet 14 is in contact with the platen 10.

A thermal type back side recording head 5 is disposed so as to be able to come into contact with the platen 9 via a recording sheet 14.
is attached to the carriage 7. In carriage 7,
Further, an ink ribbon cassette 6 for the back side is provided, and a guide shaft 8 is fitted therein, and the guide shaft 8 is disposed so as to be movable in the axial direction. The carriages 3 and 7 are attached to the belt 12 and are conveyed simultaneously (when the carriage 3 is at the recording start end, the carriage 7 is also at the recording start end). The belt 12 is stretched over a belt gear 11 and a pulley 18 that are arranged at both ends of the recording width, and the belt gear 11 is driven by a carrier motor 13. Ink ribbon cassette 2 is
A source winding core 19 and a winding core 20 are built in, and a part of the ink ribbon 16 wound between the cores is arranged so as to be exposed between the head 1 and the platen IO. At the same time, the ink ribbon cassette 6 incorporates a take-up core 21 and an original winding core 22, and a part of the ink ribbon 17 wound between the cores is arranged so as to be exposed between the hemlock 5 and the platen 9. There is. Furthermore, each of the ink ribbon cassettes 2 and 6 is penetrated by each of the heads 1 and 5, and the ink ribbon 16 is inserted into the ink ribbon cassettes 2 and 6.
and 17 on the front surface of the head.
3 and 24 are provided, respectively. Note that 15 shown in FIG. 1 is a paper feed roller for conveying the recording sheet 14.

Next, the operation in the above configuration will be explained.

First, the recording sheet 14 is sent out between the platen 10 and the head l via the paper feed roller 15 and a guide member (not shown). When a recording start button (not shown) is operated, the carrier motor 13 rotates so that the carriages 3 and 7 are at the recording start position. When the carriages 3 and 7 are set at the starting position, the head 5 is released (the printing part is separated from the surface of the ink ribbon), and the head 5 is crimped (by a motor or solenoid not shown). A force is applied that counters the force of the spring that was releasing the head, and the head is brought into pressure contact with the platen via the ink ribbon). The head 1 prints an image (not shown) based on the recorded information. The heating element is driven by the 1ilJ controller and heats the ink ribbon 16 according to the recording content. The heated portion of the ink ribbon 16 adheres to the front surface of the recording sheet 14, and the image is fixed. Corresponding to the progress of the recording process by the head 1, the carrier motor 13 rotates to move the carriage 3 in the direction of the arrow in FIG. 2, and one line of recording is sequentially performed. When one line of printing is completed, the carriage 3 is returned to the starting end, and at the same time, the platen 10 is sub-scanned by one line of printing width. Thereafter, recording is executed at the same time as described above.

As the recording head 2 continues to record on the surface of the recording sheet 14, at the point when the tip of the recording sheet 14 is exposed from between the platen 9 and the head 5, the recording head 5 is brought into contact with the recording sheet 14. Recording is performed on the surface of

At this time, since the carriage 7 moves together with the carriage 3, recording on the surface by the head 1 is also performed at the same time. Note that, as a matter of course, the recording heads 1 and 5 are driven by recording information of different contents. Furthermore, when double-sided recording by the recording heads 1 and 5 is completed and the carriages 3 and 7 are returned and when the recording sheet 14 is conveyed by the platen 9.10, the recording heads 1 and 5 are released.

FIG. 3 is a side view showing another embodiment of the present invention.

In this embodiment, whereas the previous embodiment had two carriages, one for the front side and one for the back side, facing each other on both sides of the recording sheet, the carriages were arranged in a stack on the same side. It is something.

A back platen 9 is arranged parallel to the lower part of the platen 10, and a guide shaft 8 is arranged parallel to the lower part of the guide shaft 4. A carriage 30 is slidably fitted into the guide shaft 8, and a back side ink ribbon cassette 31 is mounted on the upper surface of the carriage 30. Ink ribbon cassette 3
I is disposed at a position where the drawn-out ink ribbon 32 faces the platen 9, and a thermal recording head 33 is mounted on the carriage 30 so as to be able to press the ink ribbon 32.

Carriages 3 and 30 must move simultaneously in opposite directions along guide axes 4 and 8. For this purpose, the driving force of the carrier motor 13 is provided by a belt 36 stretched around pulleys 34 and 35.

Further, a guide roller 37 is disposed below the nozzle l for guiding the recording sheet 14 to the platen 10, a guide roller 38 is disposed for guiding the recording sheet 14 from the platen 9, and further, A conveying roller 39 for drawing out the recording sheet 14 is disposed downstream of the guide roller 38.

In the configuration shown in FIG. 4, the recording sheet 14 is carried by the carriage 3.
and 30, and the sheet is fed approximately halfway around the platen 10. Simultaneously with the embodiment described above, first, recording is performed by the recording head I.

In this case, the recording gutter 33 remains released, but the carriage 30 moves together with the carriage 3. When a plurality of lines are recorded on the recording sheet 14 by the recording head l, the recording sheet 14 is arranged in an S-shape (that is, with the back side facing the recording head 33) between the platen 9 and the ink ribbon 320. pass through. At this stage, the recording gutter 33 is pressed into contact, and recording on the back side is executed. Thereafter, double-sided recording on the recording sheet 14 is continued by the recording gutter 1 and 33.

Note that in the above embodiment, two carriages are
It was assumed that the robot was moved simultaneously by two motors, but two
They may be driven individually by different motors.

Further, although the ink ribbon was used for recording on plain paper, thermal recording is also possible if thermal paper that can develop colors on the front and back sides separately can be used.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a head for the front side and a head for the back side are disposed on each side of the recording sheet, and since these heads are configured to perform main scanning simultaneously, it is not necessary to turn the recording sheet over. Not only can recording be performed on the back side without any problems, but also the recording time can be shortened by being able to perform simultaneous recording on both sides.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
FIG. 3 is a side view showing another embodiment of the present invention, and FIG. 4 is a perspective view showing a conventional recording apparatus. 1.5.33-...-1--recording head, 2...-
・・・-・Surface ink ribbon cassette, 3.7.30
...--Carriage, 4.8...--Guide shaft, 6...-- Back side ink ribbon cassette,
9.10・−・・−・Platen, 13・−・−・−
Carrier motor, 16.17.32...--- Ink ribbon, 14... Recording sheet.

Claims (4)

[Claims] (1) In a serial type thermal recording device that performs recording by main-scanning a recording head in a direction perpendicular to the feeding direction of a recording sheet, first and second platens contacting the back and front surfaces of the recording sheet, respectively; the first and second
a first recording sheet that performs recording based on independent recording information on the front and back sides of the recording sheet conveyed by each of the platens;
and a second thermal recording head. (2) The serial type thermal recording apparatus according to claim 1, wherein an ink ribbon cassette is provided corresponding to each of the first and second thermal recording heads. (3) The serial type thermal recording apparatus according to claim 1 or 2, wherein each of the carriages on which the first and second thermal recording heads are mounted are moved simultaneously. (4) Serial type thermal recording according to any one of claims 1 to 3, characterized in that main scanning by the first and second thermal recording heads is performed independently at different timings. Device.