JPH04323157A - Recording device - Google Patents

Abstract

PURPOSE:To correct curling of a sheet material and eliminate looseness of the sheet material transferred reversely after completing recording by setting a tension to be applied to the sheet material from a transfer means to a recording means at a constant without variation in winding diameter of the sheet roll. CONSTITUTION:When a sheet material 14 is transferred in the direction for recording, a back tension is applied to the sheet material 14 to be transferred by the sliding resistance of an electromagnetic sliding clutch and the self-weight of a sheet roll 14b. Also, a solenoid 23e is de-energized by a control part, an arm 23c is energized in f direction by a tension spring 23d, and a proper sliding resistance is applied to the electromagnetic sliding clutch by the control part so that tension becomes constant without variation in winding diameter of the sheet roll 14b. A transfer roller 23a and a pinch roller 23b are positioned so that the sheet material 14 passing through the both rollers 23a and 23b is bent in the direction reverse to the direction of curling by the sheet roll 14b.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention maintains a constant tension on the sheet material being conveyed to a recording means, corrects the curl of the sheet material, and also corrects the curling of the sheet material that is conveyed in the reverse direction after recording is completed. The present invention relates to a recording device that can remove slack.

0002

[Prior Art] Conventionally, the recording system of recording devices such as facsimiles and printers has generally used a long sheet material wound into a roll, and a line-type recording head records one line at a time. It is composed of

For example, in the facsimile machine shown in FIG. 9, a sheet roll 60a wound into a roll is used.
The sheet material 60 that has been pulled out is conveyed by a platen roller 62 that is in pressure contact with a recording head 61, and an image is recorded by the recording head 61 according to the recording information.

[0004] The sheet material 60 on which the image has been recorded is cut by a cutter 63 into each page of images and is discharged from the apparatus. The sheet material 60 after being cut is configured such that the platen roller 62 is driven in reverse to return its leading end to the pressure contact area between the recording head 61 and the platen roller 62. This is to eliminate the blank space at the leading edge of the sheet during the next recording.

[0005]

However, in the above structure, since the sheet material 60 after recording and cutting is returned to the recording position by the platen roller 62, the platen roller 62 is moved as shown by the dashed line in FIG. The sheet material 60 becomes slack on the upstream side in the sheet conveyance direction. Therefore, when recording is started next time, no back tension is applied to the slack. As a result, the conveyance load on the platen roller 62 is reduced, and the drive of the motor as the drive source becomes unstable, which may cause uneven conveyance of the sheet material 60. Furthermore, since the sheet material 60 is wound into a roll, it is curled.
Jams (paper jams) tend to occur during conveyance, and the discharged sheet material 60 is also difficult to handle.

An object of the present invention is to solve the above-mentioned problems of the prior art, to prevent uneven conveyance of the sheet material by removing slack in the sheet material returned to the recording start position, and to prevent variations in the winding diameter of the sheet roll. It is possible to keep the tension applied to the sheet material constant regardless of the curl, and to properly correct curls in the sheet material according to changes in the winding diameter of the sheet roll, and to prevent peculiar curls from forming on the sheet material during recording standby. The purpose of the present invention is to provide a recording device that can perform

[0007]

[Means for Solving the Problems] A typical means according to the present invention for solving the above problems is provided in a recording apparatus that performs recording by conveying a sheet material pulled out from a sheet roll wound in a roll shape. a recording means for recording an image on a sheet material according to image information; a conveyance means capable of applying tension to the sheet material conveyed in the recording conveyance direction and conveying the sheet material in reverse; A movable support member movably supports the conveyance means in order to bend and guide the sheet material in a direction opposite to the winding direction, and the tension applied to the sheet material from the conveyance means to the recording means is It is characterized in that it is constant regardless of changes in the winding diameter of the sheet roll. The present invention is also characterized in that the bending angle of the sheet material is changed by moving a movable support member that supports the conveyance means in accordance with a change in the winding diameter of the sheet roll. Furthermore, when the sheet material is reversely conveyed by the conveyance means during recording standby, the movable support member moves to release the bent state of the sheet material.

[0008]

[Operation] According to the above means, the sheet material conveyed in the recording conveyance direction during recording is bent and guided in the opposite direction to the winding curl direction when passing through the conveyance means, and the sheet material is bent and guided in the opposite direction to the winding curl direction, and the sheet material is bent and guided in the opposite direction to the curling direction when it passes through the conveyance means. By moving the movable support member that supports the conveying means, curls that vary depending on changes in the winding diameter can be appropriately corrected. In addition, at this time, a constant back tension is applied to the sheet material due to the load due to the sheet roll's own weight and the load from the conveyance means, regardless of changes in the winding diameter of the sheet roll, making it possible to perform highly accurate and stable conveyance operations. . Furthermore, by conveying the sheet material backwards in the recording conveyance direction by the conveyance means during recording standby, it is possible to prevent the sheet material from sagging between the recording means and the conveyance means when recording starts, and also to prevent the sheet material from sagging during recording standby. By canceling this, it is possible to prevent peculiar curls such as reverse curling from occurring even if the recording standby time continues for a long time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention in which the above means is applied to a recording system of a facsimile machine will be described with reference to the drawings. Figure 1 is a cross-sectional explanatory diagram showing the schematic configuration of a facsimile machine, Figure 2 is a block diagram showing the control system of the entire machine, and Figure 3.
4 is a block diagram showing the control system of the recording means, FIG. 5 is a flowchart showing the recording operation, and FIG. 6 is an explanatory diagram showing the recording standby state of the sheet material conveying means. , FIG. 7 is an explanatory view of the curl correction operation when the winding diameter of the sheet roll is large, and FIG. 8 is an explanatory view of the curl correction operation when the winding diameter of the sheet roll is small.

First, the general structure of a facsimile machine to which the present invention is applied will be explained with reference to FIG. This facsimile machine has a document reading section A, a recording section B, and a control section C.
It consists of

First, the document reading section A will be explained. When the document 1 stacked on the document tray 1a, which is a stacking member that also serves as the top cover of the facsimile machine, is inserted through the document insertion opening 2, it is moved to the preliminary conveyance roller 3a. The sheets are sequentially fed by a preliminary driven roller 3b that is in pressure contact with this, and then separated one by one by a separation roller 4a and a separation pressing piece 4b that is in pressure contact with this. 5a, 5b and discharge roller pair 6a, 6
b is configured to be conveyed downstream.

The original 1 transported to the image reading position is irradiated with light from a light source 7, and the reflected light is imaged on a photoelectric conversion element 10 such as a CCD through a mirror 8 and a lens 9, and converted into an electrical signal. The image information is sent to the recording section of another device. After the image has been read, the original 1 is transported by the pair of ejection rollers 6a and 6b, and
The document is discharged onto a discharge tray 11 arranged near the document discharge port.

[0014] Reference numeral 12 denotes an operation unit having function keys for starting transmission, etc., a numeric keypad, etc., and 13 refers to the operation unit 12.
This is a display unit that displays the status input by. The operation section 12 is provided with a switch 12a for instructing the type of ink sheet 17. When the switch 12a is ON, the multi-print ink sheet 17 is OFF.
In this case, it is indicated that the normal ink sheet 17 has been installed.

[0015] Next, the recording section B will be described. Reference numeral 14 is a sheet material using long plain paper, and a sheet roll 14b is formed by winding this material into a roll around an inner core 14a.
It is stored in a drop-in type roll holder 15.

The ink sheet 17, which has a base film coated with thermally transferable (heat-melting, heat-sublimating, etc.) ink, is wound around an ink sheet supply roll 16a and an ink sheet take-up roll 16b.
is removably loaded into a loading section 16c within the main body of the device. The ink sheet take-up roll 16b is driven by an ink sheet conveyance motor to be described later, and the ink sheet 17
is wound in the direction of arrow a.

Further, 18 is a sensor for detecting the remaining amount of the ink sheet 17 and the conveying speed, and 19 is an ink sheet sensor for detecting the presence or absence of the ink sheet. 20 is a guide roller for guiding the ink sheet 17.

Next, reference numeral 21 denotes a recording head which is a recording means for recording an image on the sheet material 14 according to recording information. The recording head 21 has heating elements arranged in a row that each generate heat when energized according to recording information. 22 is a rotatable platen roller provided opposite to the recording head 21. The recording head 21 is urged from the back side by a spring 21e and is pressed against the surface of the platen roller 22. Therefore, the platen roller 22
is rotated to convey the sheet material 14 in the direction of arrow b, and in synchronization with this, the recording head 21 is rotated in accordance with the image signal.
The image recording device is configured to perform image recording by causing the heating element to generate heat.

Upstream of the recording head 21 in the recording conveyance direction, there is a conveyance roller 23a constituting a conveyance means for conveying the sheet material 14 in the opposite direction to the recording conveyance direction, and a conveyance roller 23a that is in pressure contact with the conveyance roller 23a and driven to rotate. A pinch roller 23b is arranged. The conveyance roller 23a is rotatably supported via a bearing on a side plate (not shown) that supports the platen roller 22, and is rotationally driven by a conveyance roller drive motor, which will be described later. The above pinch roller 23b
is rotatably supported by an arm 23c, which is a moving support member rotatably mounted around the rotation axis of the conveyance roller 23a. Further, a sheet sensor 2 for detecting the presence or absence of the sheet material 14 is provided between the recording head 21 and the conveyance roller 23a.
4 are arranged.

Further, 25a and 25b are the sheet materials 1 after recording.
4, and 26a and 26b are a pair of discharge rollers for discharging the cut sheet material 14 out of the apparatus. Note that when replacing the sheet material 14 or the ink sheet 17, the original tray 1a is held at the fulcrum 1b.
This can be done by opening the top surface of the recording system B by rotating it around the center.

The sheet material 14 pulled out from the sheet roll 14b and the ink sheet 17 fed out from the ink sheet supply roll 16a are pressed against the platen roller 22 by the recording head 21 at the recording position, and at this time, the sheet material 14 pulled out from the sheet roll 14b and the ink sheet 17 fed out from the ink sheet supply roll 16a are pressed against the platen roller 22 by the recording head 21 at the recording position. An image is recorded by causing the heating element of the recording head 21 to generate heat. Then, the recorded sheet material 14 is guided to cutters 25a and 25b,
The image is cut into pages from the trailing edge and ejected to the pair of rollers 26a.
, 26b to the outside of the device.

C indicates a control section of the facsimile machine, to which a power supply section 27 that supplies power to the entire device, a control board 28 equipped with control parts described below, a modem board unit 29, and a telephone 30a are connected. An NCU board unit 30 and the like are arranged.

The configuration of the control section C will now be explained with reference to the block diagram shown in FIG. The control unit C includes a CPU 31a that controls the entire recording apparatus, and a ROM that stores control contents and various data shown in the flowchart shown in FIG.
31b, and a RAM 31c, which is used as a work area for the CPU 31a and temporarily stores various data such as the number of sheets to be recorded.

Reference numeral 32 is a line memory for storing the image of each line of image data, and in the case of transmitting or copying an original, one line of image data from the original reading section A is stored, and when receiving the image data, the image data for one line is stored. In the case of , one line of decoded data is stored. The various data stored in the line memory 32 are output to the recording section B, whereby image recording is performed.

Reference numeral 33 denotes an encoding/decoding unit that encodes image information to be transmitted by MH encoding or the like, and decodes received encoded image data and converts it into image data. 34 is a buffer memory that stores transmitted and received encoded image data.

Next, the transport mechanism for the sheet material 14 and ink sheet 17 will be explained in detail with reference to FIG. In FIG. 3, 35 is a sheet conveyance motor for rotationally driving the platen roller 22. As shown in FIG. Further, 36 is an ink sheet conveyance motor for conveying the ink sheet 17 in the direction of arrow a. The sheet conveyance motor 35 is
It meshes with a platen gear 22a attached to the rotating shaft of the platen roller 22 via a motor gear 35a. Further, the ink sheet conveying motor 36 is connected to a motor gear 36.
It meshes with a take-up gear 16d coaxially attached to the ink sheet take-up roll 16b via a.

Further, 37 is a conveyance roller drive motor for rotationally driving the conveyance roller 23a. The conveyance roller drive motor 37 is connected via a motor gear 37a to an electromagnetic slip clutch 38 attached to the rotating shaft of the conveyance roller 23a. The electromagnetic slip clutch 38 is configured to provide an appropriate slip resistance value by changing the current by the control section C according to the winding diameter of the sheet roll 14b detected by a sheet roll winding diameter sensor (not shown), and This applies a rotational load to 23a. Further, a one-way clutch 39 supported by the arm 23c is connected to the electromagnetic slip clutch 38. The one-way clutch 39 meshes with the gear of the electromagnetic slip clutch 38, and rotates freely when rotated in the direction of arrow d, and becomes locked when rotated in the direction of arrow e.

Therefore, the conveyance roller 23a applies a conveyance load to the sheet material 14 without rotating in the direction of arrow e by the one-way clutch 39 connected to the electromagnetic slip clutch 38, and the conveyance load is applied to the sheet material 14. As it is transported, it rotates in the direction of arrow d. Therefore, the conveyance roller 23a
is configured so as not to contribute to the conveyance of the sheet material 14 by the platen roller 22 in the direction of the arrow b, but only to the conveyance in the direction of the arrow c.

The structure of the conveying means will now be explained in more detail with reference to FIG. 7. As described above, the pinch roller 23b is connected to the conveyance roller 23a by the arm 23c as shown in FIG. 7, and the arm 23c is rotatably attached around the rotation axis of the conveyance roller 23a. One end of a tension spring 23d is locked to the rotating tip of the arm 23c, and the other end is fixed to a part of the side plate supporting the platen roller 22, and the arm 23c is rotated in the direction of arrow f. It is biased towards. Further, a wire 23f drawn out from the solenoid 23e is connected to the rotating tip of the arm 23c. Furthermore, a stopper 23g for the arm 23c is provided on the side plate supporting the platen roller 22.

When the sheet material 14 is conveyed in the opposite direction to the recording conveyance direction during recording standby, when the solenoid 23e is turned on by the control section C, the arm 23c is pulled in the direction of the arrow g by the wire 23f, and pinched. roller 2
The arm 23c supporting the transfer roller 3b rotates a predetermined amount counterclockwise around the rotation axis of the conveyance roller 23a. Next, when the conveyance roller drive motor 37 is driven, the one-way clutch 39 shown in FIG. The conveyance roller drive motor 37 is driven until the downstream end of the sheet material 14 returns to the recording position of the recording head 21 to remove slack in the sheet material 14 between the conveyance roller 23a and the platen roller 22. can. When the solenoid 23e is turned off, the arm 23c rotates a predetermined amount clockwise by the elastic force of the tension spring 23d, and enters the recording standby state shown in FIG. 6.

In the recording standby state shown in FIG. 6, the sheet material 14 is slack on the upstream side of the conveyance roller 23a in the recording conveyance direction, but a certain tension is applied between the conveyance roller 23a and the platen roller 22. There is. Further, the sheet material 14 is released from the bent state by the conveyance roller 23a, and even if the recording standby state continues for a long time, it is possible to prevent the sheet material 14 from being formed with peculiar curls such as reverse curls.

Next, when conveying the sheet material 14 in the recording conveyance direction, the sheet conveyance motor 35 is driven to rotationally drive the platen roller 22 to convey the sheet material 14. At this time, the conveyance roller 23a also tries to rotate, but
Since the one-way clutch 39 is in a locked state, the conveyance roller 23a rotates together. Further, back tension is applied to the sheet material 14 being conveyed due to the slip resistance of the electromagnetic slip clutch 38 and the weight of the sheet roll 14b. Further, the solenoid 23e is turned on by the control section C.
Since the arm 23c is FF, the tension spring 2
3d in the direction of arrow f. Note that due to the slip resistance of the electromagnetic slip clutch 38 and the weight of the sheet roll 14b, which changes depending on the winding diameter of the sheet roll 14b, the back tension applied to the sheet material 14 remains constant regardless of changes in the winding diameter of the sheet roll 14b. Thus, the electromagnetic slip clutch 38 is given an appropriate slip resistance value by the control section C. Further, as shown in FIG. 1, the conveyance roller 23a and the pinch roller 23b are
The sheet material 14 passing through the sheet roll 3b is bent in a direction opposite to the direction in which the sheet material 14 is curled by the sheet roll 14b. As a result, the sheet material 14 that has been wrapped around the sheet roll 14b and curled is removed from the conveyance roller 2.
3a and the pinch roller 23b, the curl is corrected.

Next, the curl correction operation of the sheet material 14 when the winding diameter of the sheet roll 14b changes will be explained with reference to FIGS. 7 and 8. In FIG. 7, sheet roll 1
When the winding diameter φ of 4b is large, the sheet material 14 is
While the sheet material 14 is conveyed for recording in the recording direction, the tension applied to the sheet material 14 increases due to the weight of the sheet roll 14b and the conveying force of the sheet material 14 by the platen roller 22, and the tension spring 23d generated by this tension increases.
The urging force F1 determines the rotational position of the arm 23c that supports the pinch roller 23b about the rotation axis of the conveyance roller 23a, and the rotational position of the conveyance roller 23a of the sheet material 14 is determined.
The winding angle θ1 is set to be large, that is, if the curl is weak, the curl correction force is also set to be small.

Next, in FIG. 8, when the winding diameter φ of the sheet roll 14b is small, while the sheet material 14 is conveyed for recording in the direction of the arrow b, the sheet material 14 is The tension applied to the sheet material 1 caused by the conveying force becomes smaller than the tension when the winding diameter φ of the sheet roll 14b is large, and the tension spring 23d generated by this tension
The rotational position of the arm 23c supporting the pinch roller 23b about the conveyance roller 23a is determined by the biasing force F2, and the wrapping angle θ2 of the sheet material 14 with respect to the conveyance roller 23a is set small, that is, the curl is strong. In this case, the curl correction force is also set large.

According to the above configuration, the pinch roller 23b moves to the conveying roller 2 according to the change in the winding diameter of the sheet roll 14b.
By rotating around 3a, the sheet material 14
The curl can be corrected by changing the wrapping angle appropriately.

Next, the electrical connection between the recording section B and the control section C will be explained with reference to FIG. As the recording head 21, a line-type thermal head is used in this embodiment, and this recording head 21 is connected to the controller C.
A shift register 21a for inputting one line of serial recording data 40, a latch circuit 21b for latching the data in the shift register 21a using a latch signal 41, and a heating element 21 consisting of a heating resistor for one line.
It is equipped with c. The heating element 21c is 21c-1~
It is divided into m blocks and driven as shown in 21c-m. The recording head 21 is also equipped with a temperature sensor 21d for detecting temperature.
The output signal 42 is A/D converted in the control unit C and input to the CPU 31a. As a result, the CPU
31a detects the temperature of the recording head 21 and changes the pulse width of the strobe signal 43 according to the temperature, or changes the driving voltage of the recording head 21, etc. to perform recording according to the characteristics of the ink sheet 17. The energy applied to the head 21 is changed.

The types (characteristics) of the ink sheet 17 are as follows:
Although the selection is made by the switch 12a described above, it is also possible to detect a mark or the like printed on the ink sheet 17 and determine its type and characteristics. It is also possible to identify marks, notches, protrusions, etc. attached to the cartridge that houses the ink sheet 17.

Reference numeral 44 denotes a print head drive circuit which inputs a drive signal for the print head 21 from the control section C and outputs a strobe signal 43 for driving the print head 21 in units of blocks. This recording head drive circuit 44 drives the heating element 21 of the recording head 21 according to instructions from the control section C.
The energy applied to the recording head 21 can be changed by changing the control time of the current output to the power supply line 45 for supplying current to the recording head 21.

Reference numerals 46, 47, and 48 designate motor drive circuits for rotationally driving the sheet conveyance motor 35, ink sheet conveyance motor 36, and conveyance roller drive motor 37, respectively. Although stepping motors are used as the motors 35, 36, and 37, they are not limited to this, and may be DC motors or the like.

Next, the recording conveyance operation for one page using the facsimile machine shown in this embodiment will be explained with reference to the flowchart shown in FIG. The following processing is performed by the RO of control unit C.
This is performed according to a program stored in M31b. Further, this process is started when one line of image data to be recorded is stored in the line memory 32 and the apparatus enters a recording standby state.

First, in step S1, the sheet sensor 24 detects whether or not there is slack in the sheet material 14. That is, as shown in FIG. 6, when there is slack, the sheet material 14 separates from the sheet sensor 24, so the sensor 24 is turned off, and when the slack disappears and the sheet material 14 approaches the sheet sensor 24, the sensor 24 is turned on. becomes. Therefore, if the sheet sensor 24 is OFF, the process moves to step S2, and the conveying roller drive motor 37 drives the conveying roller 23a to convey the sheet material 14 in the direction of arrow c in FIG. At this time, the one-way clutch 39 rotates freely in the direction of arrow d in FIG. 2. Then, when the slack in the sheet material 14 is removed and the sheet material 14 becomes taut, the sheet sensor 24 is turned on, and steps S3 to S
5, the slip resistance value of the electromagnetic slip clutch 38 is determined. Further, the solenoid 23e is in the OFF state, and the arm 23c is pulled by the tension spring 23d and rotates a predetermined amount clockwise, and the sheet material 14 is bent in the opposite direction to the winding direction by the conveyance roller 23a and the pinch roller 23b. Guide.

In step S3, a sheet roll winding diameter sensor (not shown) is turned on to detect the winding diameter of the sheet roll 14b. Next, the process proceeds to step S4, where the control unit controls the tension so that the tension applied to the sheet material 14 due to the slip resistance of the electromagnetic slip clutch 38 and the weight of the sheet roll 14b remains constant regardless of changes in the winding diameter of the sheet roll 14b. C changes the current applied to the electromagnetic slip clutch 38 to change the slip resistance value, and determines an appropriate slip resistance value of the electromagnetic slip clutch 38 from the winding diameter of the sheet roll 14b detected in step S3. Then, the process moves to step S5 and the sheet roll winding diameter sensor is turned off.

Next, the process moves to steps S6 to S8, and a recording operation for one page is performed. That is, in step S6, the sheet conveyance motor 35 and the ink sheet conveyance motor 36 are respectively driven to convey the sheet material 14 in the direction of arrow b in FIG. 1 and the ink sheet 17 in the direction of arrow a by a predetermined amount. Next, the process moves to step S7, and the control unit C serially outputs one line of recording data 38 to the shift register 21a. When the transfer of one line of recording data 38 is completed, a latch signal 39 is output. , 1 to the latch circuit 21b
Recorded data for a line is stored. Then, each block of the heating element 21c of the recording head 21 is energized and generated to perform line recording.

Here, the ink sheet 17 in this embodiment
shows an example of so-called multi-printing in which ink transfer is possible multiple times and recording is performed while conveying the ink sheet 17 and the sheet material 14 in opposite directions. In this case, the ink sheet 17 is
The conveyance speed of ink sheet 1 can be set to slow.
7 consumption can be reduced.

Furthermore, since the slack of the sheet material 14 has been removed as described above at the time of starting the recording, the sheet material 14
The angle at which the paper sheet 4 wraps around the platen roller 22 is sufficiently certain, and by driving the platen roller 22, a sufficient conveying force can be obtained. When the sheet material 14 is conveyed by the platen roller 22 in the recording conveyance direction (arrow b direction), the conveyance roller 23a and the pinch roller 23
b rotates together, and at this time the one-way clutch 39 moves in the direction of arrow e.
In order to rotate in the direction and enter the locked state, back tension is applied to the sheet material 14 due to the resistance of the electromagnetic slip clutch 48. As a result, sheet material 1
The motor drive is properly performed without the load on the platen roller 22 that transports the sheet being too light, allowing highly accurate sheet transport and accurate image recording.

Next, in step S8, it is determined whether or not recording for one page has been completed, and if recording for one page has been completed (in the case of YES), the process moves to step S9, and the ink sheet transport The driving of the motor 36 is stopped to stop conveyance of the ink sheet 17, and the process proceeds to step S10, where the sheet material 14 is conveyed in the direction of arrow b by the platen roller 22 until the trailing edge of the image reaches the cutter position. Proceeding to step S11, the cutters 25a and 25b are driven to cut the sheet material 14 into pages. Further, if recording for one page is not completed in step S8 (
In the case of NO), the process returns to step S6 to continue the recording conveyance operation.

Next, proceeding to steps S12 to S14,
The sheet material conveyance motor 35 is driven in the reverse direction, and the sheet material 14 is fed backward by the platen roller 22 until the leading edge of the cut sheet material 14 returns to the recording position. Next, the process moves to steps S15 and S16, where the solenoid 23e is turned on and the pinch roller 2 is turned on.
After rotating the arm 23c that pivotally supports the sheet material 3b by a predetermined amount in the counterclockwise direction to release the bending guide state of the sheet material 14, the conveying roller drive motor 37 is driven to move the conveying roller 2
3a and the pinch roller 23b are rotated to reversely transport the slack sheet material 14 by a predetermined amount upstream from the recording head 21 in the recording conveyance direction to remove the slack. At this time, the one-way clutch 39 rotates freely in the direction of arrow d, so
The driving force from the motor 37 is transmitted to the conveyance roller 23a via the electromagnetic slip clutch 38. Also, the above step S
15 and S16, the conveyance amount when the sheet material 14 is reversely conveyed by driving the conveyance roller drive motor 37 is the conveyance amount when the sheet material 14 is reversely conveyed by driving the platen roller 22 in steps S12 and S13. The conveyance force of the sheet material 14 is set so that the conveyance force of the conveyance roller 23a is smaller than the conveyance force of the platen roller 22.

Next, the process moves to step S17 to determine whether or not there is a next page record, and if there is a next page record (in the case of YES), the process returns to step S1 to repeat the recording conveyance operation and perform the next page record. If there is no record (NO), the recording operation for one page is completed and the recording standby state shown in FIG. 6 is entered.

According to the above structure, the conveyance load is changed according to the change in the winding diameter of the sheet roll 14b, and the sheet material 14 is
In addition to correcting the curl of the sheet material 14b, it also removes slack in the sheet material 14 during recording to prevent uneven conveyance.
By applying a constant back tension regardless of changes in the winding diameter, highly accurate and stable sheet conveyance can be performed, and image quality can be improved.

[0050] In the above-mentioned embodiment, multi-printing was exemplified in which the sheet material 14 and the ink sheet 17 are conveyed in opposite directions for recording. Of course, it is also possible to use a configuration in which printing is carried out by conveying the paper in the same direction. Further, the recording method is not limited to the thermal transfer recording method, and other recording methods such as a thermal recording method using a heat-sensitive sheet can also be used. Furthermore, the conveying means need not be limited to a roller type, and other types such as a rotating belt may be used.

[0051]

Effects of the Invention As described above, in the present invention, the sheet material conveyed in the recording conveyance direction during recording is bent and guided in the direction opposite to the winding direction when passing through the conveyance means, and the winding diameter of the sheet roll is By moving the movable support member that supports the conveying means in accordance with the change, curls that vary depending on the change in the winding diameter can be appropriately corrected. In addition, at this time, a constant back tension is applied to the sheet material due to the load due to the sheet roll's own weight and the load from the conveyance means, regardless of changes in the winding diameter of the sheet roll, so that highly accurate and stable conveyance operation can be performed. , image quality can be improved. Furthermore, by conveying the sheet material in the upstream direction in the recording conveyance direction by the conveyance means during recording standby, the sheet material does not slacken between the recording means and the conveyance means when recording starts, thereby preventing uneven conveyance of the sheet material. Appropriate transport operations can be performed. Further, by releasing the bending guide of the sheet material during recording standby, it is possible to prevent peculiar curls such as reverse curling from occurring even if the recording standby time continues for a long time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing a schematic configuration of a facsimile device.

FIG. 2 is a block diagram showing a control system of the entire device.

FIG. 3 is a perspective explanatory view showing a sheet material conveying means.

FIG. 4 is a block diagram showing a control system of the recording means.

FIG. 5 is a flowchart showing a recording operation.

FIG. 6 is an explanatory diagram showing a recording standby state of the sheet material conveying means.

FIG. 7 is an explanatory diagram of a curl correction operation when the winding diameter of the sheet roll is large.

FIG. 8 is an explanatory diagram of a curl correction operation when the winding diameter of the sheet roll is small.

FIG. 9 is an explanatory diagram of a conventional example.

[Explanation of symbols]

A is the original reading section, B is the recording section, C is the control section, 1 is the original,
1a is the document tray, 1b is the fulcrum, 2 is the document insertion slot, 3a
is a preliminary conveyance roller, 3b is a preliminary driven roller, 4a is a separation roller, 4b is a separation pressing piece, 5a and 5b are a pair of conveyance rollers, 6a and 6b are a pair of discharge rollers, 7 is a light source, 8 is a mirror,
9 is a lens, 10 is a photoelectric conversion element, 11 is an ejection tray,
12 is an operation unit, 12a is a switch, 13 is a display unit, 14
1 is a sheet material, 14a is an inner core, 14b is a sheet roll, 1
5 is a roll holder, 16a is an ink sheet supply roll, 16b is an ink sheet take-up roll, 16c is a loading section,
16d is a winding gear, 17 is an ink sheet, 18 is a sensor, 19 is an ink sheet sensor, 20 is a guide roller, 2
1 is a recording head, 21a is a shift register, 21b is a latch circuit, 21c is a heating element, 21d is a temperature sensor, 2
1e is a spring, 22 is a platen roller, 22a is a platen gear, 23a is a conveyance roller, 23b is a pinch roller, 23c is an arm, 23d is a tension spring, 23e
is a solenoid, 23f is a wire, 23g is a stopper,
24 is a sheet sensor, 25a, 25b are cutters, 26
a, 26b are ejection roller pairs, 27 is a power supply unit, 28 is a control board, 29 is a modem board unit, 30 is an NCU board unit, 30a is a telephone, 31a is a CPU, 31b is R
OM, 31c is a RAM, 32 is a line memory, 33 is an encoding/decoding unit, 34 is a buffer memory, 35 is a sheet conveyance motor, 35a, 36a, 37a are motor gears,
36 is an ink sheet transport motor, 37 is a transport roller drive motor, 38 is a slip clutch, 39 is a one-way clutch, 40 is print data, 41 is a latch signal, 42 is an output signal, 43 is a strobe signal, 44 is a print head A drive circuit, 45 is a power supply line, and 46, 47, 48 are motor drive circuits.

Claims (3)

[Claims] 1. A recording device that performs recording by conveying a sheet material pulled out from a sheet roll wound into a roll, comprising: a recording means for recording an image on the sheet material according to image information; a conveying means capable of imparting tension to the sheet material being conveyed in the direction and conveying the sheet material in reverse; and a conveying means movable in order to bend and guide the sheet material in a direction opposite to the curling direction. 1. A recording apparatus comprising a movable support member supporting the sheet material, wherein tension applied to the sheet material from the conveying means to the recording means is constant regardless of changes in the winding diameter of the sheet roll. 2. The recording apparatus according to claim 1, wherein the bending angle of the sheet material is changed by moving a movable support member that supports the conveyance means in accordance with a change in the winding diameter of the sheet roll. 3. The recording apparatus according to claim 2, wherein when the sheet material is reversely conveyed by the conveyance means during recording standby, the movable support member moves to release the bent state of the sheet material.