JP2590851Y2 - Recording medium feeding device for recording device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus for performing a predetermined recording on a long recording medium. More specifically, a recording medium supply roller on which a long recording medium is wound, a platen roller acting as a recording tray of a recording unit, and a recording medium winding roller for winding and storing a recorded recording medium. A recording medium supply roller and a platen roller, and a predetermined slack of the recording medium between the platen roller and the recording medium take-up roller, and the recording medium is rotated at a high speed in the front-rear direction for high-speed recording. The present invention relates to a recording medium feeding device of a recording device in which a recording medium supply roller and a recording medium take-up roller are appropriately driven to rotate in the front-rear direction so as to maintain the above-mentioned predetermined slack so as to maintain good following.

[0002]

2. Description of the Related Art As this type of recording medium feeding apparatus, a so-called buffering system has conventionally been employed. The recording medium feeding method of the buffering method is
A compartment is provided which surrounds the slack of the recording medium between the recording medium supply roller and the platen roller and the slack of the recording medium between the platen roller and the recording medium take-up roller. Is to suck. In general, a recording apparatus employing such a recording medium feeding method moves a recording medium at high speed in order to perform high-speed recording. When printing with a long recording length, if the recording medium supply roller and the recording medium take-up roller are stopped, one slack becomes small and the other becomes large. Further, if the recording medium is transported by the platen roller, on the other hand, the buffering action due to the slack of the recording medium is lost, which hinders the transport of the recording medium. For this reason,
In such a recording medium feeding device, the recording medium supply roller and the recording medium take-up roller are also provided with respective rotation driving means, and the platen roller for recording is maintained so that the slack of each recording medium is maintained at an appropriate amount. It is configured such that the rotation drive according to the rotation drive amount is performed respectively. However, in this case, the recording medium is transported at a high speed, so that the recording medium is so-called rough, and when the recording medium supply roller and the recording medium take-up roller rotate in the front-rear direction, the recording medium is properly wound. In some cases, it became impossible to send or send. Therefore, by adopting the above-described recording medium feeding method of the buffering method, an appropriate load can be applied to the recording medium and the roughness can be reduced, so that the recording medium supply roller or the recording medium winding method can be used. Even when the take-up roller is rotationally driven to maintain an appropriate slack, the recording medium can be smoothly wound up or fed out.

[0003]

However, when the above-described buffering-type recording medium feeding device is employed, the device configuration becomes large-scale and cannot be implemented at low cost. That is, it is necessary to provide a housing forming a partitioned chamber surrounding the slack of the recording medium and a large fan provided in the housing and sucking the slack of the recording medium. The present invention has been made to improve the above points.

[0004]

Therefore, according to the present invention, a recording medium supply roller for winding and storing a long recording medium, and a recording medium of the recording medium supply roller is fed out and rewound as necessary. A first rotating means for rotating the supply roller in the front-rear direction, a platen roller for supporting the recording medium fed from the recording medium supply roller and acting as a recording receiving stand for a recording head, and a platen roller. A second rotating unit that rotates in the front-rear direction according to a recording signal, a recording medium take-up roller that takes up and stores a recording medium on which recording has been completed by the recording head, and a recording medium that is attached to the recording medium take-up roller. And a third rotating means for rotating the take-up roller in the front-rear direction so that the take-up roller can be taken up and transported back if necessary. The platen roller for performing when rotating at high speed in the longitudinal direction by the second rotating means,
In order to improve the follow-up of the recording medium before and after the platen roller, a predetermined slack in the recording medium between the recording medium supply roller and the platen roller and between the platen roller and the recording medium take-up roller. A recording apparatus in which a predetermined signal is applied to the first rotating means and the third rotating means so that the recording medium supply roller and the recording medium winding roller perform controlled rotation. In the recording medium feeding device, a first pinch roller unit that contacts the recording medium supply roller and a second pinch roller unit that contacts the recording medium take-up roller are provided. Further, with respect to the first pinch roller unit, ,
When the recording medium supply roller is rotating in the recording medium sending direction, the rotational friction force of the pinch roller means is small. When the recording medium supply roller is rotating in the recording medium rewind direction, the rotation of the pinch roller means is small. The first rotation direction restricting means for increasing the frictional force is used as the second pinch roller means. When the recording medium winding roller is rotating in the recording medium winding direction, the rotational friction of the pinch roller means is increased. A second rotation direction regulating means for reducing the rotational frictional force of the pinch roller means when the recording medium winding roller is rotating in the return transport direction.
It is characterized by having been provided.

[0005]

When the recording medium is rewound on the recording medium supply roller and when the recording medium is wound on the recording medium take-up roller, the pinch rollers in contact with the respective rollers are configured to generate a large rotational friction force. In addition, the recording medium can be appropriately rewound and wound around each roller. Further, when the recording medium is fed from the recording medium supply roller and when the recording medium is returned and transferred from the recording medium take-up roller, the pinch rollers in contact with the respective rollers are configured to generate a small rotational friction force. , Can be smoothly sent out and returned.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a recording medium feeding device according to the present invention; FIG. 1 is a schematic diagram showing the overall configuration of a recording apparatus according to the present invention, FIG. 2 is an explanatory view showing the relationship between the pinch roller means of the present invention and the corresponding rollers, and FIG. 3 is the pinch roller of the present invention. It is a detailed block diagram of a means.
In the figure, 1 is a recording head, 2 is a platen roller, 3
Is a housing, 4 is an electric circuit section, 5 is a cooling fan, 6 is a recording medium supply roller, 7 is a recording medium take-up roller, 8 is a right pinch roller in contact with the recording medium supply roller 6, and 9 is a recording medium take-up roller 7. , A pinch roller, 10 is a recording medium, and 11 is a support portion (not shown) at both ends of the housing 3.
Recording medium 1 consisting of a flexible sheet attached via
This is a means for preventing the occurrence of zero.

The recording apparatus according to the present invention will be described with reference to FIG. The recording apparatus shown in FIG. 1 includes a platen roller 2 rotatably supported by a housing 3, a recording medium supply roller 6, and a recording medium take-up roller 7. Although not shown, a drive motor is connected to each of these rollers, and the rollers are driven to rotate forward and backward in response to independent signals. The recording medium 10 sent out from the recording medium supply roller 6 is supported by the platen roller 2 and wound up by the recording medium winding roller 7. The platen roller 2 transports the recording medium 10 supported by the platen roller 2 in the front-rear direction in accordance with a recording signal, and the recording is performed by the recording head 1 during that time. In this recording, if the recording medium 10 is transported from right to left in the drawing, the slack of the left recording medium 10 increases, and the slack of the right side decreases. For this reason, the recording medium take-up roller 7 is rotated by the rotation drive motor in a direction to reduce the left slack (winding direction) to take up the recording medium 10, and the recording medium supply roller 6 appropriately removes the right slack. The recording medium 10 is rotated in the feeding direction so as to maintain the size.

[0008] Of the recording signals from an external device or the like (not shown), a recording head movement signal is supplied to the recording head 1, and a recording medium transport signal is supplied to a drive motor for driving the platen roller 2 to rotate. In this type of printing apparatus, the platen roller 2 rotates at high speed in the front-back direction in order to perform high-speed printing. Accordingly, the slack of the recording medium 10 between the platen roller 2 and the recording medium supply roller 6 and between the platen roller 2 and the recording medium winding roller 7 also drastically increase or decrease. Therefore, a command related to a rotation command of the platen roller 2 is provided to each drive motor connected to the recording medium supply roller 6 and the recording medium take-up roller 7 (not shown), respectively. The size is adjusted.

In this case, in this embodiment, the right pinch roller 8 that contacts the recording medium supply roller 6 and the left pinch roller 9 that contacts the recording medium take-up roller 7 are configured as follows. That is, in the right pinch roller 8, the rotational friction force FRA (of the right pinch roller 8) when the recording medium supply roller 6 rotates in the rewind direction shown by A in the drawing.
The rotational friction force FR (of the right pinch roller 8) when the recording medium supply roller 6 rotates in the feeding direction indicated by B in FIG.
B, and the rotational force FLC (of the left pinch roller 9) when the recording medium take-up roller 7 rotates in the take-up direction shown in FIG. Is larger than the rotational friction force FLD (of the left pinch roller 9) when rotating in the medium return direction indicated by D in the figure. With this configuration, for example, when the recording medium supply roller 6 rewinds the recording medium 10 at high speed as shown in FIG. The recording medium 10 is fed so as to slide near the contact point between the rollers 6 and 8. Therefore, after all, the recording medium 10 to be rewound is
Is wound in close contact with the recording medium supply roller 6 to prevent the recording medium 10 from jamming and meandering. Similarly, when the recording medium take-up roller 7 takes up the recording medium 10 at a high speed, the left pinch roller 9 increases the rotational frictional force, so that the recording medium 10 is also prevented from jamming and meandering. When the recording medium supply roller 6 rotates in the feeding direction and when the recording medium take-up roller 7 rotates in the medium return direction, since the rotational frictional force of the pinch rollers 8 and 9 is small, the recording medium 10 Is sent out smoothly.

A cooling fan 5 mounted below the electric circuit unit 4 has a function of cooling the electric circuit unit 4 and bringing the recording medium 10 on the platen roller 2 into close contact with the platen roller 2. The four flexible sheets 11 are attached to the housing 3 so as to contact the recording medium 10 before and after each slack of the recording medium 10. The flexible sheet 11 reduces the swell when the recording medium 10 is moved at a high speed. Even if the recording medium 10 moves at a high speed due to the weight of the flexible sheet, such as a roll of the recording medium, it prevents the recording medium 10 from shaking.

Next, a detailed configuration of the pinch roller means of the present invention will be described with reference to FIGS. Since each of the pinch roller means of the right pinch roller 8 and the left pinch roller 9 of the apparatus of the embodiment of the present invention has the same configuration except that the direction of the magnitude of the rotational friction force is symmetrical, The configuration of the pinch roller 8 will be described. FIG.
As shown in FIG. 7, the right pinch roller 8 is attached to the housing 3 via a holder 82. One end of the holder 82 is urged and held in the housing 3 by a coil spring 83 in the direction of arrow T, and the pinch roller held at the other end via the shaft 81 is rotatable by a predetermined pressure so that the recording medium supply roller 6 can rotate. Contact.

The detailed structure of this right pinch roller 8 has two components, a pinch roller portion and a powder clutch portion, as shown in FIG. The pinch roller portion includes a one-way clutch 84 and a pinch roller main body, and the powder clutch portion includes an inner cylinder 85 that rotates with the rotation of the shaft 81, an outer cylinder 86 and an inner cylinder 85 that are not related to the rotation of the inner cylinder 85, and It comprises a friction applying portion 88 existing between the outer cylinder 86 and an outer cylinder stopper 87 for restricting rotation of the outer cylinder 86. In the case of the right pinch roller 8, the one-way clutch 84 of the pinch roller portion makes the pinch roller body free when the recording medium supply roller 6 rotates in the direction in which the recording medium 10 is sent out. Accordingly, the pinch roller body in this case rotates following the rotation of the recording medium supply roller 6 with a small rotational friction force.
On the other hand, when the recording medium supply roller 6 rotates in the direction of rewinding the recording medium 10, the one-way clutch 84 couples the pinch roller body and the shaft 81 so that they follow the rotation of the recording medium supply roller 6 integrally. It comes to rotate. At this time, since the shaft 81 rotates together with the pinch roller body, the inner cylinder 85 of the powder clutch part also rotates at the same time. Non-rotating (external cylindrical stopper 8
A large rotational friction force is applied to the inner cylinder 85 by the friction applying portion 88 at the boundary between the outer cylinder 86 and the outer cylinder 86 subjected to 7), so that the recording medium supply roller 6 eventually rewinds (winds) the recording medium 10. When rotating, the right pinch roller 8 rotates following the rotation with a large rotational frictional force.

[0013]

As described above, the rotational frictional force of the pinch roller means that comes into contact with the recording medium supply roller 6 and the recording medium take-up roller 7, respectively, increases when the recording medium 10 rotates in the winding direction. With such a configuration, even when the recording medium 10 is moved at high speed, the recording medium 10 can be closely wound around the respective rollers 6 and 7. Accordingly, jamming of the recording medium 10 that moves at high speed, such as meandering and paper jam, can be prevented. In addition, by making the flexible sheet drop contact with the slack portion of the recording medium 10, it is possible to reduce the unevenness of the recording medium 10 due to the load due to the weight of the flexible sheet.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of a recording device of the present invention.

FIG. 2 is a side view showing the pinch roller means of the present invention.

FIG. 3 is a detailed explanatory view of the pinch roller means of the present invention.

[Explanation of symbols]

 2: Platen roller 6: Supply roller 7: Winding roller 8: Right (first) pinch roller 9: Left (second) pinch roller 11: Flexible sheet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65H 23/00-23/34 B41J 15/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A recording medium supply roller for winding and storing a long recording medium, and a recording medium supply roller for rotating the supply roller in the front-rear direction so as to send out the recording medium and rewind as necessary. A rotating means, a platen roller which supports the recording medium fed from the recording medium supply roller and serves as a recording cradle for a recording head, and a second rotating means for rotating the platen roller in the front-rear direction according to a recording signal. Rotating means, a recording medium take-up roller for taking up and storing the recording medium on which recording has been completed by the recording head, and causing the recording medium take-up roller to take up the recording medium and return and transport the recording medium as necessary. And a third rotating means for rotating the take-up roller in the front-rear direction. When rotating at a high speed in the front-rear direction, the recording medium between the recording medium supply roller and the platen roller, and between the platen roller and the recording medium take-up roller, in order to improve the following of the recording medium before and after the platen roller. A predetermined signal was applied to the first rotating means and the third rotating means so as to allow a predetermined slack in the recording medium in the meantime, and the recording medium supply roller and the recording medium winding roller were controlled. In a recording medium feeding device of a recording device adapted to perform rotation, a first pinch roller unit contacting the recording medium supply roller and a second pinch roller unit contacting the recording medium winding roller are provided. Regarding the first pinch roller means, when the recording medium supply roller is rotating in the recording medium feeding direction, The first rotation direction regulating means for reducing the rotational frictional force of the roller means and for increasing the rotational frictional force of the pinch roller means when the recording medium supply roller is rotating in the recording medium rewinding direction. Regarding the pinch roller means 2, when the recording medium take-up roller is rotating in the recording medium take-up direction, the rotational friction force of the pinch roller means is large, and the recording medium take-up roller rotates in the return transfer direction. A second rotation direction restricting means for reducing the rotational frictional force of the pinch roller means.