JPH0679951A - Printing device - Google Patents

Abstract

PURPOSE:To permit the removal of remaining jammed paper which is bitten between a pair of transfer rollers, simply and permit the smooth reopening of the paper transfer after removing the jammed paper. CONSTITUTION:The title printing device is constituted of a cover 3, provided openably at the opening of a main body case 1, respective one pair of transfer rollers 6, 11 and one pair of transfer rollers 12, 13, which are received in the main body case 1 and capable of pinching and transferring a paper, and a roller contacting and/or separating means 20, abutting both transfer rollers 6, 11 and transfer rollers 12, 13 with pressure while being operated in conjunction with the closing operation of the cover 3 or releasing the abutted condition of both transfer rollers 6 11 and transfer rollers 12, 13 while being operated in conjunction with the opening operation of the cover 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device such as a thermal printer.

[0002]

2. Description of the Related Art FIG. 6 shows a schematic structure of a conventional printing apparatus. In the figure, 1 is a main body case. Body case 1
A cover 3 is openably and closably provided in the opening of the.
Inside the main body case 1, a printing unit 5 (platen roller 6, print head 7), a paper transport system 10A, etc. are provided. The sheet conveying system 10A includes a pair of conveying rollers capable of holding and conveying the sheet P (for example, a platen roller 6 also serving as a printing plate and an upstream pinch roller 11, and a feed roller 12 and a downstream pinch roller 13). In this conventional example, the platen roller 6 is connected to a knob 6a capable of rotating the roller 6 from outside the main body case 1.
The pinch rollers 11 and 13 are connected to the roller 1
Lever 19A, 19B for separating 1 and 13 from the drive side roller (6, 12) is connected.

Here, each pair of rollers (6 and 11, 12)
If a jam occurs due to the paper P being forcibly caught in (1) and (13), the cover 3 is opened and the platen roller 6 is forcibly rotated using the knob 6a to release the jam of the paper P. Or operate the levers 19A and 19B to move the pinch rollers 11 and 13 to the drive side rollers (6 and 12).
Remove the jammed paper by moving it away from.

[0004]

By the way, in the conventional printing apparatus described above, the knob 6a and the levers 19A and 19A are provided.
Since the operation of B is usually rarely performed, the operator is often unfamiliar with the operation method. Therefore, it takes time to remove the jammed paper, and after removing the jammed paper, it is necessary to operate the lever again to press the pinch rollers 11 and 13 to the drive side rollers (6, 12). It may be generated.

In view of the above circumstances, it is an object of the present invention to easily remove jammed paper that has been caught between a pair of transport rollers and that allows smooth restart of paper transportation after removing jammed paper. An object of the present invention is to provide a printing device that can be used.

[0006]

A printing apparatus according to the present invention includes a cover that is openably and closably provided in an opening of a main body case, and a pair of conveying rollers that are housed in the main body case and that can sandwich and convey a sheet. Roller contacting / separating means that presses both the transport rollers in interlock with the closing operation of the cover and releases the press contact state of both the transport rollers in interlock with the opening operation of the cover.

[0007]

According to the present invention having the above-described structure, for example, when the cover is opened to remove the jammed paper that remains between the pair of conveying rollers, the roller contacting / separating means operates in conjunction with the opening operation of the cover. As a result, the pressure contact state of both transport rollers is released. As a result, the jammed paper can be easily removed. Further, when the cover is closed after removing the jammed paper, the roller contacting / separating means is actuated to automatically press the two conveying rollers into contact with each other. Therefore, it is possible to smoothly restart the sheet conveyance.

Therefore, it is possible to easily remove the jammed paper that has been caught between the pair of conveying rollers and remains.
In addition, it is possible to smoothly resume the sheet conveyance after removing the jammed sheet.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 5, the thermal printer according to this embodiment includes a main body case 1, a cover 3, a printing unit (platen roller 6, thermal head 7), an ink ribbon 8, a paper conveying system 10, and a roller contacting / separating unit. It is configured to include 20. Here, as shown in FIG. 5, a cover 3 is provided on the main body case 1 so as to be rotatable around a support shaft 4b via an upper frame 4, and the cover 3 covers the upper opening of the main body case 1. Is configured to open and close. A main body frame 2 for assembling various components is provided in the main body case 1.

The platen roller 6 is rotatably provided on the body frame 2 and is configured to be rotated in a predetermined direction by a drive mechanism (not shown). Also,
The thermal head 7 is provided so as to be able to come into contact with and separate from the platen roller 6 via a head shift mechanism (not shown).

The sheet conveying system 10 includes a pair of conveying rollers capable of nipping and conveying the sheet P (in this embodiment, the platen roller 6, the upstream pinch roller 11 and the feed roller 1).
2 and a downstream pinch roller 13) and the like.
The feed roller 12 is rotatably provided on the main body frame 2 and is configured to be rotated in a predetermined direction by a drive mechanism (not shown). The upstream pinch roller 11 is rotatably supported by a roller arm 51, which will be described in detail later, so that it can come into contact with and separate from the platen roller 6. Further, the downstream pinch roller 13 is rotatably supported by a slide plate 31, which will be described in detail later, so as to be able to contact and separate from the feed roller 12. The feed roller 1
Reference numeral 2 is a metal roller having a peripheral surface with irregularities of a predetermined shape in order to improve the accuracy of sheet conveyance.

Further, the roller contacting / separating means 20 is interlocked with the closing operation of the cover 3, and each pair of conveying rollers (6, 11, 1).
2 and 13) and presses the cover 3 in association with the opening operation of the cover 3 to release the pressure contact state of the conveying rollers (6 and 11, 12 and 13). In this embodiment, the roller contacting / separating means 2
Reference numeral 0 is composed of a pair of lock levers 21, 21, release springs 23, 23, slide plates 31, 31, lock cams 41, 41, roller arms 51, 51 and the like. Note that, in FIGS. 1 to 4, only a pair of lock levers 21 and the like on the front side are shown.

One end of each lock lever 21 is rotatably supported by the main body frame 2 via a support shaft 22 (shaft center 22a), and the other end thereof has a pressing portion 4 of the upper frame 4.
A leaf spring member 24 engageable with a is attached. The leaf spring member 24 is provided so that the height position of the upper frame 4 with respect to the pressing portion 4a can be adjusted. A release spring 23 is connected to each lock lever 21, and the lever 21 is biased in the direction of arrow C1 in FIG. 2 by the elastic force of the spring 23. Further, the rotation angle of each lock lever 21 is regulated by using the elongated hole 21a and the position regulation pin 39 so as not to rotate beyond the set angle range.

Further, each slide plate 31 is formed in an L shape, and is rotatably attached to the lock lever 21 via a support shaft 22. An elongated hole 31d is formed in a portion of the slide plate 31 corresponding to the feed roller 12, and the downstream pinch roller 13 is rotatably mounted in the elongated hole 31d so as to be in contact with and separated from the feed roller 12. ing. The downstream pinch roller 13 is
The push lock plate 32 attached to the slide plate 31 pushes the push lock plate 32 toward the feed roller 12.

At both ends of each slide plate 31, elongated holes 31a and 31b for restricting the rotational position are provided.
A pin 38 is slidably fitted in the long hole 31 a, and the pin 38 is fixed to the end of the thermal head 7. A pin 39 is slidably fitted in the long hole 31b, and the pin 39 is fixed to the main body frame 2. The pins 38, 39 and the like prevent the slide plate 31 from rotating beyond the set angle range. Further, the engaging portion 3 is provided at the lower end portion of the slide plate 31 in FIG.
5 is formed.

Further, each lock cam 41 is provided so that the contact pressure between the downstream pinch roller 13 and the feed roller 12 can be adjusted by changing the force pressing the engaging portion 35 of each slide plate 31. For example, each lock cam 41 is shown in FIG.
When it is rotated to the position shown in FIG. 5, the force pressing the engaging portion 35 of each slide plate 31 increases, and the downstream pinch roller 13
The contact pressure between the feed roller 12 and the feed roller 12 increases. Further, when each lock cam 41 is rotated to the position shown in FIG. 1, the force pressing the engaging portion 35 of each slide plate 31 decreases, and the contact pressure between the downstream pinch roller 13 and the feed roller 12 decreases. .

The roller arm 51 is rotatably provided on the main body frame 2 via a support shaft 52, and an upstream side pinch roller 11 is provided at the tip of the roller arm 51.
It is rotatably supported so that it can come into contact with and separate from. A spring 59 is connected to the roller arm 51, and the elastic force of the spring 59 biases the roller arm 51 in the direction of arrow E2 in FIG. The roller arm 51 is pressed against the bent portion 21 a of the lock lever 21 by the elastic force of the spring 59.

In FIG. 5, 14A and 14B are paper detection sensors, 17 is a paper carry-in path, and 18 is a printing conveyance system path. Further, 15 is a paper cassette, and 16 is an automatic sheet feed roller (ASF roller).

When the leading edge of the paper P sent out from the paper cassette 15 by the ASF roller 16 is detected by the paper detection sensor 14A, it is further fed by a fixed amount and inserted into the platen roller 6 and the upstream pinch roller 11. To be done. Subsequently, the paper P is the rollers 6, 11
Sent by. When the leading edge of the sheet P is detected by the sheet detection sensor 14B, each lock cam 4 is moved.
1 is rotated until it reaches the position shown in FIG. 4, the contact pressure between the downstream pinch roller 13 and the feed roller 12 becomes large, and the paper P is also urged to be fed by both rollers 12, 13. At this time, since the feed roller 12 has a peripheral speed slightly higher than that of the platen roller 6, the paper P is fed to both rollers 6 and 6.
It will be stretched between 12.

After the paper detection sensor 14A detects the trailing edge of the paper P, the paper P is fed by a fixed amount. Next, the rollers 6 and 12 are reversely rotated to retract the paper P. When the leading edge of the paper P is detected again by the paper detection sensor 14B, the paper P is further retracted by a certain amount and positioned at the print start position.

In this way, when the paper P is positioned at the print start position, the thermal head 7 is lowered to sandwich the yellow coated portion (Y) of the ink ribbon 8 and the paper P for printing. Color printing is completed by performing this printing operation also on the magenta-coated portion (M) and cyan (C) -coated portion of the ink ribbon 8.

After completion of printing, each lock cam 41 is set to the position shown in FIG.
The paper P is discharged by rotating until it reaches the position shown in (1) to reduce the contact pressure between the downstream pinch roller 13 and the feed roller 12. In this way, the contact pressure between the downstream pinch roller 13 and the feed roller 12 is made small by making both rollers 12, 1 after the meshing of the sheet P completes.
This is because if the roller 3 is rotated while being strongly pressed, the pinch roller 13 may deteriorate early due to the unevenness of the peripheral surface of the feed roller 12.

Next, the operation will be described. When the cover 3 is opened in order to remove the jammed paper remaining between the platen roller 6 and the upstream pinch roller 11 and between the feed roller 12 and the downstream pinch roller 13, the cover 3 is interlocked with the opening operation of the cover 3. The roller contacting / separating means 20 is operated to release the pressure contact state of each pair of rollers (6 and 11, 12 and 13).

That is, when the cover 3 is opened as shown in FIG. 2, the position regulation of the leaf spring member 24 of the lock lever 21 by the pressing portion 4a of the upper frame 4 in the arrow C1 direction is released. As a result, the lock lever 21 is rotated about the support shaft 22 in the direction of arrow C1 by the elastic force of the release spring 23. Then, the lock lever 21
The lock cam 41 attached to is also rotated in the same direction and separated from the engaging portion 35 of the slide plate 31. As a result, the position regulation of the slide plate 31 by the lock cam 41 in the arrow B1 direction is released.

Therefore, the downstream pinch roller 13 can be separated from the feed roller 12 by holding the slide plate 31 by hand and rotating it in the direction of arrow B1. On the other hand, the roller arm 51 is bent at the bent portion 21a of the lever 21 as the lock lever 21 rotates in the direction of arrow C1.
Is pushed in the direction of arrow E1 by the upstream pinch roller 11
Are separated from the platen roller 6. In this way, since the pressure contact state of each pair of rollers (6 and 11, 12 and 13) is released, the jammed paper can be easily removed.

When the cover 3 is closed after removing the jammed paper, the roller contacting / separating means 20 is operated to press the pair of rollers (6 and 11, 12 and 13) into contact with each other. That is, when the cover 3 is rotated counterclockwise from the open state shown in FIG. 2 and closed, the pressing portion 4a of the upper frame 4 causes the lock lever 21 to move in the direction of arrow C1 via the leaf spring member 24. Press in the opposite direction (direction of arrow C2 in FIG. 1). As a result, the lock lever 21 is rotated to the position shown in FIG. 1, and the lock cam 41 is also rotated in the same direction to press the engaging portion 35 of the slide plate 31 in the arrow B2 direction. This causes the downstream pinch roller 13 to move to the feed roller 12
And press. In addition, the roller arm 51 also has
With the rotation of No. 1 in the direction of arrow C2, the spring 59 rotates in the direction of arrow E2 according to the elastic force. As a result, the upstream pinch roller 11 is pressed against the platen roller 6.
Even if the closed position of the cover 3 is slightly displaced, the displacement is absorbed by the leaf spring member 24.
Is accurately positioned in the position shown in FIG. Therefore, the pressure contact amount between the downstream pinch roller 13 and the feed roller 12 and the pressure contact amount between the upstream pinch roller 11 and the platen roller 6 are set values.

According to this embodiment, however, the cover 3 openably and closably provided in the opening of the main body case 1 and the pair of conveying rollers (6) housed in the main body case 1 and capable of nipping and conveying the sheet. And 11, 12 and 13) and both transport rollers (6 and 11, 12 and 13) in conjunction with the closing operation of the cover 3.
And a roller contacting / separating means 20 for releasing the pressure contact state of both the conveyance rollers (6 and 11, 12 and 13) in association with the opening operation of the cover 3, so that each pair of conveyances It is possible to easily remove the jammed paper that remains between the rollers (6 and 11, 12 and 13), and to smoothly restart the paper transportation after removing the jammed paper.

[0028]

According to the present invention, a cover provided in the opening of the main body case so as to be openable and closable, a pair of conveying rollers housed in the main body case and capable of holding and conveying sheets, and interlocking with the closing operation of the cover. And a roller contacting / separating means for pressing both conveying rollers and releasing the pressed state of both conveying rollers in conjunction with the opening operation of the cover. The remaining jammed paper can be easily removed, and the paper conveyance can be restarted smoothly after the jammed paper is removed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an essential part of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a cover of one embodiment is opened.

FIG. 3 is an exploded perspective view for explaining a positional relationship between a sheet conveying system and a roller contacting / separating unit according to an embodiment.

FIG. 4 is a diagram showing a state in which a downstream pinch roller of one embodiment is pressed against a feed roller with a strong pressing force.

FIG. 5 is a diagram for explaining an overall configuration of an embodiment.

FIG. 6 is a diagram for explaining a schematic configuration of a conventional printing device.

[Explanation of symbols]

 1 Main Body Case 3 Cover 6 Platen Roller 11 Upstream Side Pinch Roller 12 Feed Roller 13 Downstream Side Pinch Roller 20 Roller Contact / Separation Means

Claims (1)

[Claims] 1. A cover that is openably and closably provided in an opening of a main body case, a pair of transport rollers that are housed in the main body case and can sandwich and transport a sheet, and both transport rollers are interlocked with a closing operation of the cover. And a roller contacting / separating unit that presses and releases the pressed state of both the conveyance rollers in association with the opening operation of the cover.