JPH09104544A - Image input/output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and smoothly convey paper with a simple mechanism by setting a standby position of a pinch roller to a position where a tip end part of paper supplied to a paper feed port via a common port comes into contact with a peripheral surface opposed to a capstan roller of the pinch roller. SOLUTION: When paper is fed, a pinch roller 5 is placed in a standby position separated upward from a capstan roller 4, thermal head is also placed in a standby position separated upward from a platen roller, and a clearance, which can supply transcribed paper 20, is formed between the capstan roller 4 and the pinch roller 5 and between the platen roller and the thermal head. The standby position of the pinch roller 5 is set to a position such that a tip end part of the transcribed paper 20 supplied by hand work, after protruding from a common port, comes into contact with a downward or diagonally front downward peripheral surface of the pinch roller 5, that is, a peripheral surface opposed to the capstan roller 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input / output device such as a printer, a copying device, and an image reading device, which is suitable for a thermal transfer type color printer, and more particularly to a simple mechanism and accurate paper conveyance. For improvement to do well and smoothly.

[0002]

2. Description of the Related Art In a thermal transfer type color printer, an image is printed by overlaying an ink film on a transfer paper (paper) and transferring the image from the ink film to the transfer paper by a thermal head. The ink film has three primary colors of yellow, magenta, and cyan, and by reciprocating the transfer target paper 3 times,
The three primary colors are transferred.

[0003]

As described above, in the color printer of the thermal transfer system, the transfer paper is reciprocated a plurality of times, so that the images of the three primary colors are transferred to the same position on the transfer paper. Requires high precision in the operation of the transfer paper transport mechanism. In the middle of the transportation route,
There is a need for a transport mechanism that does not cause the transfer paper to jam (paper jam). Further, in the event that a jam is caused, it is necessary that the jammed transfer paper can be smoothly removed. These are requirements that are commonly required to some extent in general printers not limited to the thermal transfer system, and further in general image input / output devices such as copy devices and image readers.

However, the conventional image input / output device has a problem that it is difficult to accurately and smoothly convey a sheet with a simple mechanism.

The present invention has been made in order to solve the above-mentioned problems in the conventional apparatus, and an object thereof is to provide an image input / output apparatus capable of accurately and smoothly conveying a sheet with a simple mechanism. To do.

[0006]

In the apparatus of the first invention, a sheet fed from the outside to a sheet feeding port is pressed and nipped by a capstan roller and a pinch roller, and the capstan roller is rotationally driven. In the image input / output device, which conveys the paper by performing printing of an image on the paper or reading of an image from the paper in the process of conveying the paper, and then conveys the paper to a paper discharge port. The paper feed port is provided so as to overlap with the paper discharge port,
The paper feed port and the paper ejection port communicate with a common port that opens facing the capstan roller and the pinch roller by bending the paper feed port downward or bending it downward at a gentle angle. The pinch roller can stand by at a standby position apart from the capstan roller when the sheet is not conveyed, and the standby position is the leading end portion of the sheet supplied from the outside to the sheet feeding port. Is set at a position where it comes into contact with the peripheral surface of the pinch roller facing the capstan roller via the common port.

According to a second aspect of the invention, in the image input / output apparatus of the first aspect, both the side edges of the sheet feed port and the sheet discharge port in a direction perpendicular to the transport direction of the sheet are respectively provided. A pair of guides for guiding is provided. Among these guides, a pair of guides belonging to the paper feed port is set to have an interval such that they are substantially in close contact with the side edge, The pair of members belonging to each other are characterized in that the mutual spacing is set to such an extent that the side edges are guided with play.

In the apparatus according to the third aspect of the invention, the paper fed from the outside to the paper feed port is nipped by a capstan roller and a pinch roller, and the capstan roller is rotationally driven to convey the paper. However, in the image input / output device that prints an image on the sheet or reads an image from the sheet in the process of conveying, and then conveys the sheet to a sheet discharge port, the pinch roller is
When the sheet is not conveyed, the sheet can stand by at a standby position apart from the capstan roller, the apparatus includes a control unit that controls operations of the pinch roller and the capstan roller, and the control unit is the When a sheet is conveyed to the sheet ejection port, one end of the sheet protrudes from the sheet ejection port to the outside, and the other end of the sheet is conveyed by the pinch roller and the capstan roller. Before the pinched state is released, the rotation drive of the capstan roller is stopped to stop the conveyance of the sheet to the sheet discharge port, and the pinch roller is moved to the standby position. Characterize.

In a fourth aspect of the present invention, in the image input / output apparatus of the third aspect, the control means stops the rotational drive of the capstan roller when the sheet is conveyed to the sheet discharge port. Then, after moving the pinch roller to the standby position, the capstan roller is once rotated to such an extent that the peripheral surface of the capstan roller that contacts the paper is separated from the paper, and then stopped. Is characterized by.

The apparatus of the fifth invention conveys a sheet by rotationally driving the capstan roller while pressing and sandwiching it with a capstan roller and a pinch roller, and printing or printing an image on the sheet in the course of conveyance. In an image input / output device that reads an image from the paper, the capstan roller is provided on a shaft and at both ends of the shaft with a diameter larger than that of the shaft to improve frictional force with the paper. And a pair of grid rollers that have been treated on the peripheral surface, and the pinch roller,
A rotary shaft, and a pair of elastic rollers having a diameter larger than that of the rotary shaft at both ends of the rotary shaft facing the grid roller and at least a peripheral surface of which is formed of an elastic body, The device is provided with a lever in which two parts equidistant from a center point rotatably connected to the main body of the device are individually connected to both ends of the pinch roller, and the center point or the two parts are provided. At least one of which is connected via an elastic member, the elastic restoring force of the elastic member serves as a pressing force that presses the pinch roller against the capstan roller, and has a uniform magnitude at both ends of the pinch roller. It is characterized by being transmitted.

The apparatus of the sixth invention conveys a sheet by rotationally driving the capstan roller while pressing and pinching it with a capstan roller and a pinch roller, and printing or printing an image on the sheet in the course of conveyance. In an image input / output device that reads an image from the paper, the capstan roller is provided on a shaft and at both ends of the shaft with a diameter larger than that of the shaft to improve frictional force with the paper. And a pair of grid rollers that have been treated on the peripheral surface, and the pinch roller,
The rotary shaft, a pair of elastic rollers having a diameter larger than that of the rotary shaft at both ends of the rotary shaft facing the grid roller, and at least a peripheral surface of which is formed of an elastic body, and sandwiched between the pair of elastic rollers. The pair of elastic rollers has a diameter equal to or less than the diameter of the pair of elastic rollers, and is provided at the center of the rotating shaft.

In the present invention, the "image input / output device" is a concept including both an image input device and an image output device such as a printer, a copying device, an image reader, and the like.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

<1. Overall Configuration of Device> FIG. 2 is a side sectional view of the image input / output device according to the embodiment. This image input / output device 100
Is an example of a thermal transfer type color printer,
A case where a postcard is used as the transfer target sheet will be described as an example.

In FIG. 2, 1 is a main body of the apparatus, 2 is a paper feed port provided on the front surface of the main body 1 of the apparatus, 3 is a discharge port provided on the front of the main body 1 of the apparatus, and 4 is a capstan. Rollers, 5 are pinch rollers, 6 is a platen roller, 7 is a thermal head, 8 is a lever for supporting the thermal head 7, 9 is a cover for covering the upper part of the apparatus main body, 10 is a lever 8 and a cover 9 for the apparatus main body 1. Each of the rotary shafts is rotatably supported, 11 is a spring that is interposed between the thermal head 7 and the cover 9 and biases the thermal head 7 against the platen roller 6, and 12 is an image to be transferred onto a transfer sheet. Ink film for printing 13 is ink film 1
2 is a pre-wound supply bobbin, 14 is a take-up bobbin for winding the ink film 12, 15 is a drive mechanism for rotationally driving the capstan roller 4, 16 is a drive mechanism for vertically moving the pinch roller 5, and 17 is a lever. A drive mechanism for moving the thermal head 7 up and down by rotating 8 and 18 are drive mechanisms 15, 16, 1
7 is a control unit that controls 7.

The capstan roller 4 is a drive roller connected to a drive mechanism 15 having a drive motor. The capstan roller 4 cooperates with a pinch roller 5 which is a driven roller to nip and rotate the transfer target sheet to transfer the transfer target sheet. Move back and forth. By moving the pinch roller 5 up and down,
It can be pressed against and separated from the capstan roller 4.
Further, the thermal head 7 can be pressed against and separated from the platen roller 6 by moving vertically as well.

<2. Conveyance Mechanism of Transferred Paper> FIG. 3 is a partial side sectional view showing the operation of the apparatus 100 for feeding paper, that is, for supplying the transferred paper. In FIG. 3, reference numeral 20 is a postcard as a transfer target paper (paper). The paper feed port 2 and the paper ejection port 3 are both provided on the front surface of the apparatus main body 1 so as to be vertically overlapped with each other, and the paper feed port 2 is provided above the paper ejection port 3. . The paper feed port 2 and the paper discharge port 3 are connected to the capstan roller 4 and the pinch roller 5.
Common opening 2 that opens at the front (left side in FIG. 3) of the
It communicates with 1.

The paper feed port 2 is provided along the horizontal direction like the paper ejection port 3 except for the vicinity of the common port 21.
It bends or bends in the vicinity of the common port 21 and merges with the sheet discharge port 3. That is, the paper feed port 2
The transfer-target paper 20 manually supplied from the front opening 22 is first guided in the horizontal direction, and then, when the leading end of the transfer-target paper 20 approaches the common opening 21, the ceiling surface bends or bends downward. Is guided so as to curve downward along the upper inner wall 23.

When feeding paper, the pinch roller 5 is
The control unit 18 and the drive mechanism 16 work to put the capstan roller 4 at a standby position apart from the upper position. Similarly, the thermal head 7 also has a control unit 18 and a drive mechanism 17.
By the action of, the platen roller 6 is at a standby position separated upward. That is, gaps are formed between the capstan roller 4 and the pinch roller 5 and between the platen roller 6 and the thermal head 7 so that the transfer target paper 20 can be supplied.

The waiting position of the pinch roller 5 is the peripheral surface below the pinch roller 5 or obliquely below the front, after the tip of the transfer paper 20 supplied by hand projects from the common port 21. It is set at a position where it comes into contact with the peripheral surface facing the capstan roller 4.
That is, the standby position of the pinch roller 5 is set at a position where the transfer paper 20 wraps below the pinch roller 5 and can be easily inserted between the pinch roller 5 and the capstan roller 4.

When the transfer paper 20 is inserted between the capstan roller 4 and the pinch roller 5, the pinch roller 5 is lowered by the action of the control unit 18 and the drive mechanism 16, and the action of a spring (not shown) is performed by the capstan. The roller 4 is pressed. As a result, the transfer paper 20 is pressed and nipped by the capstan roller 4 and the pinch roller 5.

Thereafter, as shown in the partial side sectional view of FIG. 4, the capstan roller 4 is driven to rotate in the normal direction, so that the transfer paper 20 is conveyed to the rear of the apparatus (right side in FIG. 4). At this time, since the thermal head 7 is in the standby position, the thermal head 7 and the platen roller 6 are
It does not hinder the movement of the transfer paper 20.

When the transfer sheet 20 has been moved to the printing start position while keeping the state of being sandwiched between the capstan roller 4 and the pinch roller 5, printing is started.
FIG. 5 is a partial side sectional view showing the process of printing. That is, when the transferred paper 20 reaches the printing start position, the thermal head 7 descends, and the spring 11 acts to press the thermal head 7 against the platen roller 6. As a result, the ink film 12 is pressed against the transfer paper 20.

Thereafter, the control unit 18 and the drive mechanism 15 drive the capstan roller 4 in the reverse direction, so that the transfer paper 20 is conveyed to the front of the apparatus (left side in FIG. 5). At this time, due to the frictional force between the ink film 12 and the transfer paper 20, the ink film 12
Moves with the transfer paper 20 and is wound up on the winding bobbin 14 (FIG. 2) to which a constant torque is applied. At this time, an image signal is input to the heater line 30 provided in the thermal head 7, so that a predetermined image is transferred from the ink film 12 to the surface of the transfer paper 20.

The apex of the capstan roller 4 and the apex of the platen roller 6 are aligned horizontally, and the transfer paper 20 is conveyed horizontally toward the paper exit 3. The ink film 12 is formed in a strip shape by sequentially connecting ink films of three primary colors. Then, when the printing of one primary color is completed, the thermal head 7 moves up to the standby position again, and the capstan roller 4 is driven to rotate in the normal direction again, so that the transferred paper 20 is returned to the printing start position. Then, the next primary color printing is performed. In this way, the transfer paper 20 reciprocates 3 times,
Printing of three primary colors is completed.

In the case of this example, since a postcard made of plain paper is used as the transfer paper 20, in order to enable transfer of the ink material onto the paper surface, the ink film 12 has three primary colors. A white precoat material is placed at the beginning of the ink film group.
Prior to the primary color printing, the pre-coat material is coated in the same manner as the printing, so that the transfer paper 20 has a total of 4
The printing of the three primary colors is completed by reciprocating.

FIG. 6 is a partial side sectional view showing the stop position of the transfer paper 20 after the printing of the three primary colors is completed.
As shown in FIG. 6, when the printing of the three primary colors is completed, one end of the transferred paper 20 projects outward from the front opening 24 of the paper exit 3, and the other end moves from the pinch roller 5 to the rear of the apparatus. The reverse rotation drive of the capstan roller 4 is stopped at a position where the pinch roller 5 and the thermal head 7 are raised to the standby position.

The movements of the capstan roller 4, the pinch roller 5, and the thermal head 7 are controlled by the control unit 1.
8 instructions. The control unit 18 grasps the timing of completion of printing based on the timing of termination of application of the image signal to the thermal head 7, for example. Alternatively, the number of rotations of the capstan roller 4 from the start of printing may be grasped.

In the state shown in FIG. 6, the transfer target paper 20 can be manually taken out from the front opening 24 by picking one end. Also, in the unlikely event that the transferred paper 20 causes a jam in the discharge port 3, as a result, the transferred paper 2
Even when one end of 0 does not project to the outside from the front opening 24, by opening the cover 9 (FIG. 2), the other end of the transferred paper 20 projecting to the rear of the pinch roller 5 is pinched, and Transferred paper 2 by pulling up by work
It is possible to easily remove 0 from the transport path such as the paper discharge port 3.

When the cover 9 is opened, the lever 8 is also opened in conjunction with it, so that the thermal head 7 is largely separated from the platen roller 6. Therefore, the thermal head 7
Does not interfere with the manual work of picking up the other end of the transfer paper 20.

Further, preferably, after the pinch roller 5 is raised to the standby position, the capstan roller 4 is rotated in either direction by a slight certain angle by the action of the controller 18 and the drive mechanism 15. . As will be described later, when the transfer paper 20 is pressed against the capstan roller 4 by the pinch roller 5, the specially processed peripheral surface of the capstan roller 4 comes into close contact with the transfer paper 20. After the pressing by the pinch roller 5 is released, the capstan roller 4 is slightly rotated to release the close contact state. As a result, the front opening 2 of the transfer paper 20
It is easier to take out from 4 and to remove when jammed.

FIG. 7 is a partial plan sectional view showing the planar shape of the paper feed port 2. The paper feed port 2 is provided with a pair of guides 25 and 26 for guiding the side edges of the transferred paper 20, that is, the edges in the direction orthogonal to the transport direction. The guides 25 and 26 are installed at intervals corresponding to the standardized size of the transfer sheet 20 and the width thereof. That is, the pair of guides 25 and 26 closely contact the transfer sheet 20 with no gaps and guide the transfer sheet 20. As a result, the transfer target paper 20 supplied from the outside to the paper feed port 2 is precisely positioned at a predetermined position and orientation.

FIG. 8 is a partial plan sectional view showing the planar shape of the paper discharge port 3. The paper discharge port 3 is also provided with a pair of guides 27 and 28 for guiding the side edges of the transferred paper 20.
These guides 27, 28 are arranged at a large interval with a certain margin larger than their width according to the standardized size of the transfer paper 20. That is, the pair of guides 27, 28 has a certain amount of play, and the transfer paper 20 has a certain amount of play.
I will guide you. As a result, the transferred paper 20 to be discharged is
Even if it is slightly displaced from the predetermined position and direction (shown by the dotted line in FIG. 8), the transfer target paper 20 is ejected by the guide 2
Not disturbed by 7, 28. That is, the transfer paper 20 is smoothly discharged.

As described above, in this apparatus 100, the transfer sheet 20 is both supplied and discharged in front of the apparatus, so that the apparatus is compact. Further, the paper feed port 2 and the paper discharge port 3 are individually provided so that the side edge of the transfer paper 20 can be guided densely at the paper feed port 2 and with play at the paper discharge port 3. Therefore, both precise positioning at the time of paper feeding and smooth paper ejection are realized.

Further, the paper feed port 2 is provided so as to overlap with the upper part of the paper discharge port 3, and the paper feed port 2 is easily bent due to the effect of gravity so that the paper feed port 2 is easily bent downward. The transfer target sheet 20 is transferred to the transfer sheet 20 because it bends downward at the inner side or bends at a gentle angle to join the sheet discharge port 3.
Supply is carried out smoothly. Further, the transfer target paper 20 supplied from the paper feed port 2 contacts the peripheral surface of the pinch roller 5 facing the capstan roller 4, so that the transfer target paper 2 is transferred.
0 is smoothly inserted between the pinch roller 5 and the capstan roller 4. This also contributes to the smooth supply of the transferred paper 20.

<3. Pinch Roller and Support Mechanism Thereof> Next, the support mechanism of the pinch roller 5 will be described in detail. FIG. 1 is a perspective view showing a support mechanism of the pinch roller 5. At both ends of the capstan roller 4, grid rollers 41 having a diameter larger than that of the shaft are provided. At both ends of one of the pinch rollers 5, a rubber roller (elastic roller) 42 having a diameter larger than that of the shaft (rotating shaft) 42 is also provided.
Is provided at a position where it abuts on the grid roller 41. At least the peripheral surface of the rubber roller 42 is made of rubber (elastic body).

Both ends of the pinch roller 5 are provided with a pair of levers 3.
1 is rotatably supported at one end. These levers 31 are rotatably supported by the apparatus main body 1 (FIG. 2) at fulcrums 34. The other ends of these levers 31 are connected to a lever 33 whose center point 35 is rotatably supported by the apparatus main body 1 via a pair of springs 32. The rubber roller 42 is pressed and biased toward the grid roller 41 by these springs 32.

As shown in the enlarged view of FIG. 9, the peripheral surface of the grid roller 41 is processed so that the metal fine projections 43 having a height of about 100 μm are densely gathered. As a result of the rubber roller 42 being pressed against the grid roller 41 with the transfer paper 20 interposed therebetween, the minute projections 43 are transferred to the transfer paper 20.
Bite into. Therefore, the rotation of the capstan roller 4 is accurately transmitted to the transfer paper 20 without slipping between the capstan roller 4 and the transfer paper 20.

Further, since the expensive grid roller 41 is provided only at both ends of the capstan roller 4, not only the capstan roller 4 can be manufactured at low cost, but also
There is an advantage that a trace of the grid roller 41 does not remain in a conspicuous region in the image transferred to the transfer paper 20, and a high quality printed image can be obtained.

Returning to FIG. 1, the pair of springs 32 are
At a position equidistant from the center point 35, the lever 3
3 is attached. That is, in FIG. 1, the distances L1 and L2 are equal to each other. For this reason, the forces W1 and W2 with which the pair of rubber rollers 42 press the pair of grid rollers 41 are always equal to each other, even if the strength of the pair of springs 32 varies.

As described above, the pair of springs 32 are not directly connected to the apparatus main body 1, but the levers 33 are connected.
, The pressing force applied to the grid roller 41 at both ends of the transfer paper 20 is not biased. For this reason, the transport speed becomes uniform between both ends of the transfer paper 20, and thus the direction of the transfer paper 20 is unlikely to shift during the transportation process. That is, the transfer paper 20 can be accurately conveyed by a simple and inexpensive mechanism.

FIG. 10 is a front view showing a more preferable structure of the pinch roller 5. In this pinch roller 5, rubber rollers 42 are provided not only at both ends of the shaft but also at the center. As a result, the rubber roller 42 and the grid roller 4
The transfer-target paper 20 whose both ends are clamped by 1 is prevented from being curved at the central portion (illustrated by a dotted line in FIG. 10),
It is transported while maintaining a flat surface. That is, the accuracy of conveyance is further improved.

Since the grid roller 41 is not provided at the center of the capstan roller 4, the transfer paper 20 is not pressed and nipped between the rubber roller 42 at the center and the capstan roller 4. Therefore, the rubber roller 42 at the central portion does not interfere with the conveyance of the transfer paper 20. The central roller 42 does not need to have elasticity like the rubber rollers 42 on both sides, and may be a roller having a diameter equal to or smaller than the diameter of the rubber rollers 42 on both sides.

<4. Modification> (1) In the support mechanism of the pinch roller 5 shown in FIG.
Only one of the pair of springs 32 may be replaced with a wire having high rigidity, for example. That is, the lever 31
The same effect can be obtained by using the spring 32 for only one of the pair of members that connect the lever 33 with the lever 33. Alternatively, the spring 32 is not used for any of the pair of members that connect the lever 31 and the lever 33, and the member that connects the center point 35 of the lever 33 and the apparatus main body 1 (FIG. 2) is similar to the spring 32. The same effect can be obtained by using the spring. Further, in any of these forms, another elastic member such as a rubber string may be used instead of the spring 32.

(2) In the above embodiment, an example in which the fine projections 43 are densely packed on the peripheral surface of the grid roller 41 has been shown. Any treatment that promotes the frictional force may be used.

(3) In the above embodiment, the thermal transfer type color printer has been described as an example, but the characteristic feature of the configuration is that the printer other than the thermal transfer type, or the copying apparatus other than the printer, the image reader, etc. In general, the image input / output device can be implemented. For example, the image reader is realized by removing the ink film 12 and replacing the thermal head 7 with an image reading head. Further, the transfer paper 20 using a postcard made of plain paper has been described as an example, but other various transfer papers may be used.

[0046]

In the apparatus of the first aspect of the invention, since the paper feed port and the paper discharge port are provided so as to overlap each other, the device is compact. In particular, the paper feed port is provided above the paper ejection port, and the paper is easily bent downward due to the effect of gravity, so that the paper feed port is bent downward or bent downward at a gentle angle. Since it communicates with the common port, the paper can be fed smoothly. Further, since the paper fed from the paper feed port comes into contact with the peripheral surface of the pinch roller at the standby position facing the capstan roller, the paper is smoothly inserted between the pinch roller and the capstan roller. That is, the paper is smoothly guided to a position where it can be conveyed.

In the apparatus of the second invention, the side edge of the sheet is
Since the paper is guided densely at the paper feed port and with play at the paper ejection port, precise positioning at the time of paper feeding and smooth paper ejection are both realized.

In the apparatus of the third aspect of the invention, the conveyance of the paper is stopped in the state where one end of the paper is projected from the paper discharge port to the outside,
Since the capstan roller and the pinch roller release the paper, it is possible to pick up the paper normally from the paper discharge port by pinching one end. Further, since the other end of the paper is left between the capstan roller and the pinch roller, even if the paper is jammed in the paper ejection port and cannot be taken out normally, the other end is not removed. It is possible to pinch and remove the paper from the paper exit.

In the apparatus of the fourth aspect of the invention, after the conveyance of the sheet to the sheet discharge port is stopped and the pinch roller is separated from the capstan roller, the peripheral surface of the capstan roller contacting the sheet is separated from the sheet. Since it rotates once and then stops, the close contact state between the capstan roller and the sheet is released. Therefore, the normal removal of the sheet and the removal at the time of jamming can be performed more easily.

In the apparatus of the fifth aspect of the present invention, since the peripheral surface of the grid roller is subjected to the treatment for improving the frictional force with the paper, slippage between the grid roller and the paper is unlikely to occur. The paper is conveyed accurately. Further, since the pressing force is evenly applied to both ends of the pinch roller by the action of the lever and the elastic member, the pair of elastic rollers provided at both ends of the pinch roller are arranged so that the grid rollers facing each other with equal pressing force. Press. For this reason,
Since the conveying speed is uniform between both ends of the sheet, it is difficult for the sheet to be misaligned during the conveying process. That is, accurate and accurate sheet conveyance can be realized by a simple and inexpensive mechanism.

In the apparatus of the sixth invention, the rollers are provided not only at both ends of the pinch roller facing the pair of grid rollers but also at the central portion. Therefore, the sheet whose both ends are sandwiched by the pair of grid rollers and the pair of elastic rollers facing each other is suppressed from being curved in the central portion, and is conveyed while keeping a flat surface. That is, it is possible to obtain the effect of further improving the accuracy of transportation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a support mechanism for a pinch roller of an apparatus according to an embodiment.

FIG. 2 is a side sectional view of the device according to the embodiment.

3 is a partial side sectional view of the vicinity of the pinch roller of the apparatus of FIG.

4 is a partial side sectional view of the vicinity of the pinch roller of the apparatus of FIG.

5 is a partial side sectional view of the vicinity of the pinch roller of the apparatus of FIG.

FIG. 6 is a partial side sectional view of the vicinity of the pinch roller of the apparatus of FIG.

FIG. 7 is a partial plan cross-sectional view showing a planar shape of a paper feed port.

FIG. 8 is a partial plan cross-sectional view showing a planar shape of a paper discharge port.

FIG. 9 is a schematic view showing a peripheral surface of a grid roller.

FIG. 10 is a front view showing a more preferable configuration of the pinch roller.

[Explanation of symbols]

2 paper feed port, 3 paper ejection port, 4 capstan roller, 5
Pinch roller, 18 control unit (control means), 20 transfer paper (paper), 21 common port, 25, 26, 27, 2
8 guides, 41 grid roller, 42 rubber roller (elastic roller), 33 lever, 32 spring (elastic member), 100 color printer (image input / output device).

Claims (6)

[Claims] 1. A paper sheet fed from an external source to a paper feed port is nipped by a capstan roller and a pinch roller, and the paper sheet is conveyed by rotationally driving the capstan roller. In an image input / output device that prints an image on the paper or reads an image from the paper, and then conveys the paper to a paper exit, the paper feed opening is located above the paper exit. The paper feed port and the paper ejection port are provided so as to overlap with each other, and the paper feed port is curved downward or bent downward at a gentle angle to face the capstan roller and the pinch roller. The pinch roller can stand by at a standby position separated from the capstan roller when the paper is not conveyed, and the standby position is an external position. The leading end portion of the sheet fed from the sheet feeding port to the sheet feeding port is set at a position where it comes into contact with the peripheral surface of the pinch roller facing the capstan roller via the common port. Image input / output device. 2. The image input / output device according to claim 1, wherein a pair of guides for guiding both side edges of the paper feed port and the paper ejection port in a direction perpendicular to a transport direction of the paper are provided. Of these guides, the pair that belongs to the paper feed port
The space between them is set so that they are substantially in close contact with the side edges,
An image input / output device, wherein a pair of the paper output ports is set to have a space for guiding the side edges with play. 3. A paper sheet supplied from an external source to a paper feed port is nipped by a capstan roller and a pinch roller, and the capstan roller is rotationally driven to convey the paper sheet. In an image input / output device that prints an image on the sheet or reads an image from the sheet and then conveys the sheet to a sheet discharge port, the pinch roller is configured to perform the operation when the sheet is not conveyed. The apparatus can stand by at a standby position apart from a capstan roller, the apparatus includes a control unit that controls operations of the pinch roller and the capstan roller, and the control unit moves the sheet to the sheet discharge port. When the paper is conveyed, after one end of the paper is projected to the outside from the paper discharge port, and yet the other end of the paper is the pinch roller and the cap. Before the state of being pinched by the stun roller is released, the rotational drive of the capstan roller is stopped to stop the conveyance of the sheet to the sheet discharge port, and the pinch roller is moved to the standby position. An image input / output device characterized by being moved. 4. The image input / output device according to claim 3, wherein the control unit stops the rotational drive of the capstan roller and conveys the pinch roller when the sheet is conveyed to the sheet discharge port. After moving the capstan roller to the standby position, the capstan roller is once rotated to such an extent that the peripheral surface of the capstan roller contacting the paper is separated from the paper, and then stopped. I / O device. 5. A sheet is conveyed by rotationally driving the capstan roller while being pressed and sandwiched by a capstan roller and a pinch roller, and an image is printed on the sheet or an image from the sheet is conveyed during the conveying process. In an image input / output device for reading, the capstan roller is provided on a shaft and both ends of the shaft with a diameter larger than that of the shaft, and a peripheral surface is subjected to a treatment for improving a frictional force with the paper. And a pair of grid rollers, and the pinch roller is provided with a rotation shaft and both ends of the rotation shaft facing the grid roller with a diameter larger than that of the rotation shaft. A pair of elastic rollers formed of an elastic body, and the device is equidistant from a center point rotatably connected to the main body of the device. One of the two parts has a lever separately connected to both ends of the pinch roller, and at least one of the center point and the two parts is connected via an elastic member, so that the elastic restoring force of the elastic member is increased. However, the image input / output device is characterized in that the pressing force for pressing the pinch roller against the capstan roller is transmitted to both ends of the pinch roller in a uniform size. 6. A paper is conveyed by rotating and driving the capstan roller while being pressed and sandwiched by a capstan roller and a pinch roller, and an image is printed on the paper or an image from the paper is conveyed during the conveyance. In an image input / output device for reading, the capstan roller is provided on a shaft and both ends of the shaft with a diameter larger than that of the shaft, and a peripheral surface is subjected to a treatment for improving a frictional force with the paper. And a pair of grid rollers, and the pinch roller is provided with a rotation shaft and both ends of the rotation shaft facing the grid roller with a diameter larger than that of the rotation shaft. A pair of elastic rollers formed of an elastic body, and a central portion of the rotary shaft sandwiched between the pair of elastic rollers, having a diameter equal to or smaller than that of the pair of elastic rollers are provided. Image output apparatus characterized by comprising: a roller, a.