JPH0611558B2 - Recording device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording apparatus, and more particularly to a recording apparatus capable of recording on both sides of a recording sheet.

[Prior Art] In most conventional recording apparatuses, recording is performed on one side of one recording sheet. When it is desired to perform recording on both sides, the recording sheet after recording one side is used by the recording apparatus. The person had to turn inside out with his own hands and record again the opposite side.

When such a method is adopted, when recording is performed on both sides, it is necessary for the user to always be near the recording device, and during that time, other work cannot be performed, which is extremely inefficient.

Further, in order to perform accurate recording on the opposite side after recording one side, it is necessary for the user to always judge the front, back, left and right, or the front and back of the recording paper when reattaching the recording paper. However, if this is mistaken, accurate double-sided recording cannot be performed.

On the other hand, there is a recording apparatus having a structure in which one recording head and one platen are provided for the front surface and one for the rear surface, but there is a drawback that the apparatus becomes large-scale and complicated and becomes extremely expensive.

[Objective] The present invention has been made to eliminate the above-mentioned conventional defects, and an object thereof is to provide a low-cost recording apparatus capable of automatically performing double-sided recording.

[Examples] Hereinafter, details of the present invention will be described based on Examples shown in the drawings.

[First Embodiment] FIGS. 1 to 6 illustrate an embodiment of the present invention.
In the figure, reference numeral 1 indicates a casing of the apparatus, and a recording paper holding member 2 is provided integrally with the casing 1.

On the other hand, the reference numeral 4 is a platen, and the platen shaft 4a
Is configured so that it can be rotated in the direction of arrow A in the figure by a motor or the like not shown.

A recording head 3 is provided which is slidably movable along a shaft 5 arranged in parallel with the platen 4.

Below the platen 4, a paper guide 9 is arranged with a curved surface having an arcuate shape and separated from the platen 4 by a predetermined distance.

On the other hand, reference numerals 7 and 8 denote pinch rollers, both ends of which are rotatably supported between side plates of a device (not shown) and pass through an opening (not shown) formed in the paper guide 9. It is pressed against the peripheral surface of the platen 4.

Therefore, the pinch rollers 7 and 8 are rotated along with the rotation of the platen 4.

The recording paper 6 inserted along the recording paper holding member 2 is guided while being sandwiched between the pinch rollers 7 and 8 and the peripheral surface of the platen 4.

On the other hand, claw rings 11 are provided at both ends of the platen 4 as shown in FIGS.

A plurality of protrusions 11a are formed on the claw ring 11 along the circumferential direction and in the direction parallel to the axis of the platen 4.

The claw ring 11 is made of a member having sufficient elasticity, and the projection 11a projects from the peripheral surface of the platen 4 as shown in FIG. 3 when no force is applied to the projection 11a. When the recording paper 6 is wound, the projection 11a is bent inward as shown in FIG. 4 so that the recording paper 6 is not lifted up or wrinkled.

The claw rings 11 are provided on both ends of the platen 4.

On the other hand, a plurality of pressure contact rollers 10 are in contact with the platen 4 above it. The pressure roller 10 has a shaft 10a.
Is rotatably supported by the pressure contact roller 10 by a spring (not shown) or the like so that a force is applied to the pressure contact roller 10 in the direction of contacting the peripheral surface of the platen 4.

Next, the operation of this embodiment configured as described above will be described.

When the apparatus is started, the platen 4 is rotated in the direction of arrow A, and the pressure roller 10 is rotated in the opposite direction.

When the recording paper 6 is inserted along the holding member 2 in this state,
The leading edge is guided between the platen 4 and the pinch rollers 7 and 8, and the recording paper 6 is set at the recording position.

This recording paper may be set automatically, but the operator may arbitrarily set the recording start position and the like.

The leading edge of the recording paper is sandwiched between the platen 4 and the pressure roller 10 to be in the state shown in FIG. When the recording is started in this state and the recording for one line is completed, the platen 4 is rotated, the paper is fed, and then the first surface 6 of the recording paper 6 is sequentially transferred.
Recording is performed on the a side.

When the recording is advanced, the recording paper 6 is fed in the direction of the arrow B, and eventually the recording on the first surface 6a is completed.

Even after the recording on the first surface 6a is completed, the platen 4
When the rotation of the recording paper 6 is continued, as shown in FIG.
Although c is disengaged from the pressure roller 10, the platen 4 continues to rotate, and the claw ring 11 integrated with the platen 4 is also rotating.
c is caught, and the trailing edge 6c of the recording paper 6 is guided in the direction indicated by the arrow C in FIG. 5 as the platen 4 rotates, and is again guided between the platen 4 and the pinch roller 7.

This state is shown by a chain double-dashed line in FIG.

Then, as the platen 4 rotates, the recording paper 6 is again guided to the recording position.
Will be automatically guided to the recording position.

If recording is performed in this state, it is possible to perform recording on the back side without any modification.

After the recording on both sides is completed in this way, the platen 4 may be stopped from rotating and the recording paper 6 may be pulled out.

Since the present embodiment is configured as described above, it is possible to automatically perform printing on both sides by simply inserting the recording paper.

When the recording apparatus is in the double-sided recording mode, if the structure is such that the platen 4 is automatically stopped after recording on both sides, that is, two pages, it is not necessary to stop the rotation of the platen 4 by manual operation. Moreover, it is possible to prevent double recording on the recording paper 6.

Second Embodiment By the way, in the above-described embodiment, the structure in which the claw ring 11 is molded separately from the platen 4 and is attached to the platen is adopted, but it is shown in FIG. When the platen 4 is made of an elastic material such as rubber, the claw ring 11 may be integrally formed with the platen 4.

Even if such a structure is adopted, the same effect as that of the above-described embodiment can be obtained.

[Effect] As is clear from the above description, according to the present invention, the recording paper inserted between the cylindrical platen and the pinch roller is conveyed along the platen, and recording is performed on the recording paper. In a recording apparatus that performs recording, when the force is not applied, the recording medium is made of an elastic member that protrudes from the peripheral surface of the platen and bends toward the axis of the platen when the recording paper is wound around the platen. After the recording of the surface is completed, the rear end is engaged with the platen and the pinch roller in a state in which the other end of the recording paper is engaged with the rear end of the recording paper and the other surface of the recording paper faces the recording surface. Since a plurality of protrusions are provided along the circumference of the platen at the end of the platen, the other surface of the recording paper is automatically changed over after the recording on one surface of the recording paper is completed. The trailing edge of the recording paper with the recording side facing By directing between the platen and the pinch roller, led to the other surface of the recording sheet in the recording position, it is possible to automatically perform recording on both sides of a recording sheet.

Further, the structure is extremely simple, and it is possible to obtain a recording device capable of double-sided recording at low cost.

[Brief description of drawings]

1 to 6 illustrate one embodiment of the present invention.
FIG. 1 is a vertical sectional side view of a state in which recording is started on the first side of the recording paper, FIG. 2 is a perspective view illustrating the structure of the platen, FIG. 3 is a vertical sectional side view of an end portion of the platen, and FIG. Is a vertical cross-sectional side view of the end of the platen with the recording paper wound around the platen, FIG. 5 is a vertical cross-sectional side view of the end of recording on the first side of the recording paper, and FIG. FIG. 7 is a vertical side view of the end portion of the platen for explaining another embodiment of the present invention. 1 ... Housing, 2 ... Holding member, 3 ... Recording head, 4 ... Platen, 6 ... Recording paper, 6a ... First surface, 6b ... Second surface, 6c ... End portion, 7 , 8 ... pinch roller, 9 ... paper guide, 10 ... pressure contact roller, 11 ... claw ring, 11a ... protrusion

Claims (1)

[Claims] 1. A recording apparatus which conveys a recording paper, which is inserted between a cylindrical platen and a pinch roller, along the platen and stores the recording paper in the recording paper, when the force is not applied. The recording medium is composed of an elastic member that protrudes from the peripheral surface and bends toward the axis of the platen when the recording sheet is wrapped around the platen. When the platen rotates, a protrusion that guides the rear end between the platen and the pinch roller with the other surface of the recording paper on the recording surface side is formed at the end of the platen. A recording device, wherein a plurality of recording devices are provided along the circumferential direction.