JPS61154865A - Recorder - Google Patents

Abstract

PURPOSE:To automatically perform perfect recording, by a method wherein a paper-discharging roller capable of being rotated forward and reversely in conjunction with a platen is provided, and the roller is reversely rotated under the condition where the trailing end of a recording paper comes beyond a separation guide, thereby leading the back side of the paper to a recording position. CONSTITUTION:When recording on one side is finished, it is discriminated whether or not the opposite side is recorded, and when the opposite side is not yet recorded, a driving motor is rotated forward to feed the recording paper 6 until the trailing end 6d of the paper 6 is detected by a reflection-type sensor 22. When the trailing end 6d is detected, the paper is further fed, and when it is discriminated that the paper 6 is fed by a prescribed amount and the trailing end 6d comes beyond the separation guide 20, the motor is reversely rotated to rotate the paper-discharging roller 10 counterclockwise, thereby feeding the paper 6 sequentially to the side of a side edge 20b. This operation is repeated until the paper 6 is fed by the prescribed amount and the leading end of the paper comes between the platen 4 and a pinch roller 8. Then, the motor is rotated forward, thereby recording on the side 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording device, and more particularly to a recording device capable of double-sided recording.

[Prior art] Most conventional recording devices record on one side of a single sheet of recording paper, and when it is desired to record on both sides, the user of the recording device must manually remove the paper after recording on one side. It was necessary to turn it over by hand and record the face again, that is, the opposite side to the previously printed side.

In the above method, when recording on both sides of a single sheet of recording paper, the user of the recording device must be present at all times near the recording device, which is extremely inefficient. Furthermore, in order to accurately record on the opposite side after recording on one side, when reinserting the recording paper,
It is necessary for the user of the recording device to constantly judge whether the recording paper is front to back, left or right, front or back, and if a mistake is made, accurate double-sided recording cannot be performed.

On the other hand, a recording device that is equipped with separate recording heads, platens, etc. for recording on the front side and back side of a document has also been proposed, but if such a structure is adopted, the device becomes complicated and large, resulting in high cost. There is a drawback.

[Objective] The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and provides a recording device configured to automatically perform double-sided recording with an extremely simple structure. The purpose is to

[Example] The present invention will be described in detail below based on an example shown in one drawing.

[First Embodiment] Figure 1 and the following diagrams explain the first embodiment of the present invention.
In the figure, reference numeral 1 indicates the housing of the device.

A recording paper holding member 2 is provided in a part of the recording paper.

A platen 4 is rotatably mounted horizontally within the housing 1.
It is provided so that it can be rotated in forward and reverse directions about a shaft 4a by a motor (not shown) or the like.

A recording head 3 is slidably provided on a shaft 5 disposed parallel to the platen 4, and is moved along the platen 4 in accordance with a recording command to perform recording on recording paper, which will be described later.

A pinch roller 7.8 is arranged below the platen 4. The pinch roller 7.8 is pressed against the platen 4 through an opening in a paper guide 9 which is guided in an arc along the underside of the platen 4.

Reference numeral 6 denotes a recording sheet, which is guided along the holding member 2 between the platen 4 and the pinch rollers 7.8.

On the other hand, above the platen 4, the shaft 11 is connected to the side plate 14.1.
It is rotatably supported between the four.

A paper discharge roller 10 is fixed to this shaft 11.

A plurality of protrusions 10a are protruded from one end of the paper ejection roller 1O at equal angular intervals along the circumferential direction.

Further, a pulley 12 is fixed to one end of the shaft 11,
A bell 13 is stretched between this pulley 12 and a pulley 4b fixed to the platen 4.

Therefore, the platen 4 and the paper discharge roller lO are rotated synchronously via the belt 13.

On the other hand, alongside the shaft 11, a shaft 16 is suspended horizontally between the side plates 14, 14 of the device.

As shown in FIG. 2, both ends of the shaft 16 are slidably and rotatably fitted into elongated holes 14a formed in the side plates 14, respectively.

A spring 17 is stretched between both ends of the shaft 16 and a pin 18 protruding from the outside of the side plate 14, and draws the shaft 16 toward the shaft 11 along the elongated hole 14a.

Note that the axis of the elongated hole 14a is oriented in the direction of the axis 11.

A paper feed roller 15 is rotatably supported on the shaft 16 at a position corresponding to the paper discharge roller IO.

The paper feed roller 15 has a windmill 15a at one end and a large diameter portion 15b at the other end.

The windmill 15a is located outside the flange lOb formed at one end of the paper ejection roller lO, and the large diameter portion 15b is located on the outer side of the flange lOb formed at one end of the paper ejection roller lO.
It touches the center of O.

Note that the tensile force of the spring 17 is extremely weak, and when the recording paper is guided between the paper ejection roller 10 and the paper feed roller 15, the windmill 15a is lifted onto the recording paper due to the rigidity (stiffness) of the recording paper. This is the extent to which the paper feed roller 15 and the shaft 16 can separate from the paper ejection roller IO against the tensile force of the spring 17.

Further, since the circumferential speed of the paper discharge roller 10 is set to be slightly faster than the circumferential speed of the platen 4, it is possible to prevent the recording paper from sagging when it is fed as will be described later.

On the other hand, a mountain-shaped separation guide 20 is arranged between the platen 4 and the paper ejection roller IO.

One side 20a of the separation guide 20 is inclined toward the recording head 3, and the other side 20b is inclined toward the holding member 2.

A paper ejection guide 19 faces the side 20a of the separation guide 20.
This paper ejection guide 19 is provided with a paper sensor 2.
2 is installed.

The paper sensor 22 is a reflective sensor and detects the trailing edge of the recording paper.

FIG. 9 explains the control circuit, and in the same figure, a control section indicated by the reference numeral 23 controls each of the platen drive motor, recording head drive motor, and recording head 3 (not shown) via drivers 24 to 26. It also processes the signal from the reflective sensor 22.

Next, the operation of this embodiment configured as above will be explained using the flowchart shown in FIG.

Note that the prescribed amounts A-C in FIG. 11 have the following contents.

The specified IA is the distance from when the paper sensor 22 detects the trailing edge of the recording paper until it stops at a position beyond the separation guide 20 as shown in FIG.

The specified amount B is the distance from the rear end of the recording paper on which the first side has been recorded to the pinch roller 8, as shown in FIG.

The specified amount C is the distance from the paper sensor 22 to the lower end of the paper output tray 21.

Based on the above definition, the following control is performed.

First, when the recording paper 6 is set on the holding member 2, the platen drive motor rotates in step 31, the platen 4 is rotated forward, and the recording paper 6 is fed.

Then, in step S2, a sensor (not shown) determines whether the leading edge of the recording paper 6 has reached the recording position,
If it has not reached the recording position, the platen drive motor continues to rotate to feed the recording paper, and if it has reached the recording position, the process advances to step S3, where the platen drive motor is stopped and paper feeding is stopped.

Next, in step S4, the recording head drive motor is rotated to perform recording with the recording head, and in step S5
In step S4, it is determined whether recording for one line has been completed, and if it has not been completed, the process returns to step S4 to continue recording.
If one line of recording has been completed, the process advances to step S6;
It is determined whether recording of one page, that is, the specified number of lines, has been completed.

If the recording of the first page has not been completed, the process returns to step 51.
After the platen is rotated by a predetermined amount and the recording paper 6 is fed by one line, recording is performed (see FIGS. 3 to 5).

If the above operations are repeated and the recording of one side is completed, the process proceeds to step S7, and it is determined whether or not the opposite side has been recorded. If no recording has been performed, step S8
Proceed to.

In step S8, the platen rotation drive motor is rotated forward, and in step S9, the paper is fed until the rear end 6d of the recording paper 6 is detected by the reflective sensor 22.

If the trailing edge 6d of the recording paper 6 is detected, step SI
Further, the paper feed is continued at step S10, and at step Sll, the recording paper 6 is fed by a specified amount shown by the material number A in FIG.
If it is determined that the position has reached the position exceeding the
Proceed to step 12.

In step 512, as shown in FIG. 6, the platen drive motor is reversely rotated to rotate the paper ejection roller lO in the counterclockwise direction in FIG. Send sequentially.

At this time, since the upper end of the side 20b of the separation guide 20 that guides the recording paper 6 is located outside of the tangent line 1 passing through the contact portion between the paper ejection roller lO and the paper feed roller 15, the recording paper 6
The rear end 6d is always guided toward the side 20b as shown in FIG.

This operation is repeated in step S13 until the recording paper 6 is fed by a prescribed amount indicated by material number B in FIG. 5, and the leading edge of the recording paper reaches between the platen 4 and the pinch roller 8.

Subsequently, in step 514, the platen drive motor is rotated forward, and the process returns to step 31, where recording is performed on the second surface 6b in the same manner as on the first surface 6a.

On the other hand, if it is determined in step S7 that recording on the second side 6b has been completed, the process proceeds to step 515.

At this time, recording on the opposite side, that is, the first side 6a, has been completed, so in step 315, the platen drive motor is further rotated in the forward direction, and in step S16, the rear end 6c of the recording paper 6 is detected by the reflective sensor 22. Further, in step S17, the paper is fed by a predetermined amount indicated by material number C in FIG. ~See Figure 9).

In this way, double-sided recording is automatically performed.

After the recording is completed, the recording paper is stacked on the paper discharge tray 21.

[Second Embodiment] By the way, although the above-mentioned embodiment is illustrated as being provided with a reflective paper sensor 22, double-sided recording can be automatically performed even when a paper sensor is not used.

Figures 12 to 14 explain an embodiment in which a paper sensor is not used. In each figure, the same or corresponding parts as in Figures 1 to 10 are given the same reference numerals, and their explanations are is omitted.

In this embodiment, since the position of the paper cannot be detected by a sensor, control is performed based on the length of the recording paper.

Although the length of the recording paper is not shown, it is input to the recording paper length input section 27 shown in FIG. 12 via a keyboard or the like.

The specific control is performed as shown in FIG. 13, and the specified amount A in FIG.

The content is different from C.

That is, the prescribed amount A in FIG. 13 is the amount when the recording paper is transferred from the pinch roller 8 after recording on the first side and is temporarily stopped between the paper ejection roller IO and the paper feed roller 15, as shown in FIG. 14. This is the amount obtained by adding the length L of the recording paper to the distance X to the rear end 6d of the recording paper 6.

Further, the specified amount C is the specified amount A plus the distance from the state shown in FIG. 14 until the recording paper 6 enters the paper discharge tray 21.

The prescribed amount B is the same as in the first embodiment.

Next, the actual recording operation will be explained based on the flowchart shown in FIG.

That is, first, the length of the recording paper used in step AI in FIG. 13 is input into the input section 27.

Next, in step A2, recording paper is set,
In step A3, the drive motor for the platen 4 is rotated in the normal direction to feed the recording paper.

The platen is rotated until the recording paper reaches the recording position in step A4.

When the recording position is reached, the platen driving motor is stopped in step A5, and the recording head drive motor is rotated in step A6 to start recording by operating the recording head while moving the head.

Recording is performed while constantly monitoring whether or not each line has been completed in step A7, and is repeated until recording on the entire first side (front surface) of the recording paper is completed in step A8.

When the recording of the first side is completed, the process proceeds to step A9, and it is determined whether or not the second side (back side) has already been recorded. If not, the drive motor for the platen 4 starts normal rotation in step AIO. do.

Then, in step All, it is determined whether or not the recording paper has been fed by a specified amount A, and if it has been fed, step A
At 12, the platen drive motor is reversed.

This reversal is repeated until the recording paper is fed by the specified amount B in step A13, and when the recording paper is fed by the specified amount B, the platen drive motor starts rotating forward in step AI4, and the process returns to step A3, where the same process as for the first side is performed. Recording of the second side begins.

By the way, if it is determined in step A9 that the recording on the second side has been completed, the platen drive motor is rotated forward in step A15, and the paper is fed in step A16 until the recording paper is fed by a specified amount of 0 minutes. ,
The rear end of the recording paper is caught by the protrusion 10a, and the recording paper on which double-sided recording has been completed is sent into the paper discharge tray 21 to complete the double-sided recording.

In this way, even if there is no paper sensor, double-sided printing can be automatically performed in the same manner as in the first embodiment described above, by using the length of the recording paper as a reference.

That is, regardless of whether a paper sensor is used or the length of the recording paper is used as a reference, the platen and the paper ejection roller interlocked therewith can be rotated in the forward and reverse directions while monitoring the state of the recording paper. This allows automatic double-sided recording.

[Effects] As is clear from the above description, according to the present invention, a paper ejection roller that can rotate in forward and reverse directions in conjunction with the platen is provided, so that the paper ejecting roller can be rotated forward and backward in conjunction with the platen, and the paper ejection roller can be removed after the recording of the first side of the paper has been completed. The paper ejection roller is reversed when the rear edge reaches the position beyond the separation guide, so that the second side of the recording paper is guided to the recording position, making it easy to replace the recording paper. Double-sided recording can be performed automatically without any trouble.

[Brief explanation of the drawing]

Figures 1 to 11 illustrate a first embodiment of the present invention, with Figure 1 being a vertical cross-sectional side view explaining the schematic structure, and Figure 2 showing the mounting state of the paper ejection roller and paper feed roller. FIGS. 3 to 9 are perspective views for explaining the double-sided recording operation, FIG. 1θ is a block diagram of the control circuit, FIG. 11 is a flowchart for explaining the control method, and FIGS. FIG. 14 explains the second embodiment of the present invention, FIG. 12 is a block diagram of the control circuit, FIG. 13 is a flowchart explaining the control method, and FIG. 14 is a vertical cross-sectional side view explaining the schematic structure. It is a diagram. 4...Platen 6...Recording paper 7.8...
Pinch roller 10... Paper ejection roller 13... Belt 15...
Paper feed roller 20...Separation guide 22...Paper sensor Fig. 10

Claims (1)

[Claims] In a recording device having a platen whose drive is controlled by a control unit and a recording means, a separation guide provided above the platen, and a paper ejection roller which rotates forward and backward in conjunction with the platen above the separation guide. When the recording on the first side of the recording paper is completed and the trailing edge of the recording paper has been guided beyond the separation guide, the paper ejection roller is reversed, and the back side of the recording paper is removed through the separation guide. What is claimed is: 1. A recording device characterized in that the recording device is configured to be able to guide the image to a recording position.