JPH04292969A - Sheet material transport device and recorder provided with said sheet matgerial transport device - Google Patents

Abstract

PURPOSE:To prevent troubles in a device from occurring by immediately detecting a failure in transporting a sheet material. CONSTITUTION:As a sheet material 14 is fed in the direction of an arrow (a) by driving a platen roller 23, an encoder roller 24 and pressing rollers 25 between which said sheet material 14 is clamped are rotated. An impeller 31 mounted on one end of a core bar 24a of said encoder roller 24 rotates in the direction of an arrow (c). At this time, an input signal representing a rotating cycle obtained by passing impeller parts 31a and slit parts 31b of said impeller 31 alternately through a position between a light emitting part 32a and a light receiving part 32b of a transmitting-type photosensor 32 is transmitted to a control part. The transport state of said sheet material 14 is immediately detected. If a failure in the transport occurs a recording action is brought to a stop, an action for recovering the transport state is carried out, and the abnormality is indicated to a user, as required.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material conveying device for detecting a conveyance failure of a sheet material wound into a roll, and a recording apparatus to which the sheet material conveying device is applied.

0002

[Prior Art] Conventionally, recording systems of recording devices such as facsimiles and printers have generally used long sheet materials wound in a roll, and a line-type recording head records one line at a time. It is composed of

For example, in the recording apparatus shown in FIG. 8, a recording sheet 50 pulled out from a rolled sheet roll 50a is moved to the downstream side (in the sheet conveyance direction) indicated by arrow a in the figure using a platen roller 51. (hereinafter simply referred to as the "downstream side"). Further, the ink sheet 53 wound around the supply roll 52 is conveyed in the direction of arrow b in the figure, and is taken up by a take-up roll 54. Further, a recording head 55 biased from the back side by a spring 55a presses against the platen roller 51, and by making the recording head 55 generate heat according to recording information, the ink on the ink sheet 53 is heated. It is configured so that an image can be recorded by being transferred onto a recording sheet 50. Further, 56 is a photosensor for detecting the presence or absence of the recording sheet 50, and 57 is a guide plate provided facing the photosensor 56. The guide plate 57 is the recording sheet 50
It is made of a material whose light reflectance is lower than that of the back surface. Further, 58 is a cutter for cutting the recording sheet 50 after image recording into each page of images.

To explain the conveyance operation of the recording sheet 50 of the recording apparatus, first, in the recording standby state, as shown in FIG. It is waiting at a position further upstream. At this time, the light emitted from the photosensor 56 is reflected by the guide plate 57 and inputted to the photosensor 56 again, and the level of this reflected light is set to Lo.
w (hereinafter simply referred to as "L").

Next, when recording is started, as shown in FIG.
are transported in the directions of arrows a and b, respectively. Then, the recording head 55 is made to generate heat according to the recording information, and recording is performed on the recording sheet 50 line by line. When the leading edge of the recording sheet 50 passes through the photosensor 56, the light emitted from the photosensor 56 is reflected on the back surface of the recording sheet 50 and inputted into the photosensor 56 again, causing the light reflectance of the guide plate 57 to change. Since the level of the reflected light is higher, the level of this reflected light is referred to as High (hereinafter simply referred to as "H"). If the input level of the photosensor 56 changes from L to H when the platen roller 51 is rotated by a predetermined amount (until the leading edge of the recording sheet 50 passes over the photosensor 56 from the recording standby position in FIG. 8). In this case, it is assumed that the recording sheet 50 is being conveyed normally, and if the input level remains at L, it is assumed that a conveyance failure has occurred in the recording sheet 50. Further, when the recording corresponding to one page is completed, the recording sheet 50 is cut by the cutter 58, the recorded recording sheet 50 is ejected from the apparatus, and the leading edge of the unrecorded recording sheet 50 is placed on the platen. The roller 51 is driven in the reverse direction to be conveyed upstream and rewound to the recording standby position shown in FIG. Therefore, when the input level of the photosensor 56 changes from H to L after recording, cutting, and rewinding operations are completed, it is assumed that normal conveyance operation is being performed, and the input level is H. If it remains as it is, it is considered that a conveyance failure of the recording sheet 50 has occurred.

[0006]

However, in the prior art described above, the conveyance state of the recording sheet 50 is detected only at limited times. That is, only when the leading edge of the recording sheet 50 crosses the photosensor 56 immediately after recording starts, and only when the leading edge of the recording sheet 50 crosses the photosensor 56 again after recording ends. Therefore, it was not possible to detect the conveyance state of the recording sheet 50 during the recording operation. For example, during the recording operation shown in FIG.
Even if an abnormality occurs in the drive source of the platen roller 51 and the platen roller 51 stops rotating, the photo sensor 5
6, the abnormality cannot be detected. in this case,
Since the recording sheet 50 stops, images are recorded in the same area overlapping each other, making it impossible to read information, and the heat of the recording head 55 is concentrated on the same area, causing the ink sheet 53 and the recording sheet to 50 may be damaged.

In contrast, it has been proposed to provide the platen roller 51 with an encoder, but as described above, the recording sheet 50 is conveyed in the opposite direction to the ink sheet 53. Therefore, if the friction between the recording sheet 50 and the ink sheet 53 becomes greater than the friction between the recording sheet 50 and the platen roller 51, even if the platen roller 51 is rotating normally, the recording sheet 50 and the platen roller 51 As a result, there is a risk that the recording sheet 50 may stop, causing the above problem, or may be transported in the same direction as the ink sheet 53 (arrow b direction) and wind around the take-up roll 54. Ta. The above problem may occur due to a decrease in the frictional force of the platen roller 51 due to changes over time, or a change in the frictional force between the recording sheet 50 and the ink sheet 53 due to changes in temperature and humidity. , the above abnormality cannot be detected.

SUMMARY OF THE INVENTION The object of the present invention is to provide a sheet material conveying device and its sheet material conveying device that solves the above-mentioned problems of the prior art, immediately detects sheet material conveyance defects, and prevents device troubles from occurring. The purpose of this invention is to provide a recording device to which the technology is applied.

[0009]

[Means for Solving the Problems] Means for solving the above-mentioned problems of the prior art and applied to the embodiments described below include a sheet material conveying device that includes a conveying means for conveying the sheet material; The apparatus is characterized in that it includes a driven rotary body that rotates as the sheet material is conveyed, and a rotation detection means that detects a rotation period of the driven rotary body. Further, the recording apparatus is characterized in that it includes the sheet material conveying device and a recording means for recording an image on the sheet material according to recording information.

[0008]

[Operation] According to the above means, the sheet material conveying device detects whether the recording operation is in progress by providing a rotation detecting means to detect the rotation period of the driven rotating body that rotates when the sheet material is conveyed. Regardless of the situation, the conveyance state of the sheet material can be detected at all times. Also, regarding recording devices,
By immediately detecting conveyance defects of the sheet material,
It is possible to prevent device troubles from occurring.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording apparatus to which the present invention is applied will be described below with reference to the drawings. In this embodiment, a facsimile machine will be explained as a recording device.

FIG. 1 is a cross-sectional explanatory diagram showing a schematic configuration of a facsimile machine, FIG. 2 is a perspective explanatory diagram of a sheet material conveying device, FIG. 3 is an explanatory diagram of the main parts of the sheet material conveying device, and FIG. 4 is a diagram showing the control means. FIG. 5 is a timing chart showing the relationship between the drive pulse of the recording conveying means and the output pulse of the rotation detecting means, and FIG. 6 is a flow chart showing the sheet material conveying operation.

First, the general configuration of a facsimile machine to which the present invention is applied will be explained with reference to FIG. This facsimile machine is comprised of an original reading section A, a recording section B, a control section C, and a power supply section D.

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 conveyed to the image reading position is irradiated with light from the light source 7, and the reflected light is reflected by the first reflecting mirror 8a.
, the image is formed on a photoelectric conversion element 10 such as a CCD via the second reflecting mirror 8b and the lens 9, and converted into an electrical signal. In the facsimile mode, the image information is transmitted to the recording section of another machine and copied. In the case of mode, the data is configured to be transmitted to a recording section B, which will be described later. After the image has been read, the original 1 is conveyed by the pair of ejection rollers 6a and 6b, and is ejected onto an ejection tray 11 disposed near the original ejection 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 state input by the operator, the transport state of the sheet material, etc. An ink sheet 17 is provided in the operation section 12.
A switch is provided to indicate the type of ink sheet 17. When the switch is ON, it indicates that a multi-print ink sheet 17 has been installed, and when it is OFF, it indicates that a normal ink sheet 17 has been installed.

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 a core 14a.
It is stored in a drop-in type roll holder 15. An auxiliary roller 15a is provided at the bottom of the roll holder 15 to facilitate rotation of the sheet roll 14b when the sheet material 14 is pulled out. One or more auxiliary rollers 15a can be provided in contact with the sheet roll 14b, and the auxiliary roller 15a can be provided in contact with the sheet roll 14b.
, the auxiliary roller 15a is less likely to slip between the sheet material 14 and the sheet material 14b.
Since the rotation of the sheet material 14 is assisted, the conveyance state of the sheet material 14 is stabilized, and generation of noise such as flapping sound of the sheet material can be prevented.

Reference numeral 16 is an ink sheet supply roll around which the ink sheet 18 is wound, and 17 is an ink sheet winding roll for winding up the ink sheet 18. This ink sheet winding roll 17 is driven by an ink sheet conveying motor, which will be described later, and winds up the ink sheet 18 in the direction of arrow a. The above ink sheet supply roll 16
, the ink sheet winding roll 17 is loaded into an ink cartridge 19 that is detachably attached to the main body of the apparatus. The ink cartridge 19 supports the ink sheet supply roll 16 and the ink sheet take-up roll 17 rotatably around cores 16a and 17a, respectively, and a cassette 19a that constitutes an exterior with an open part.
It becomes more. Further, 20 is a capstan roller that conveys the ink sheet 18, and 21 is a capstan roller that conveys the ink sheet 1.
This is a guide shaft that defines the conveyance path of No. 8.

Next, 22 is a recording head which is a recording means for recording an image on the sheet material 14 according to recording information. The recording head 22 has heating elements arranged in a row that individually generate heat when energized according to recording information. Reference numeral 23 denotes a rotatable platen roller which is provided opposite to the recording head 22 and is a means for conveying the sheet material 14. The recording head 22 is biased from the back side by a spring 22a and presses the platen roller 23 via the ink sheet 18 and sheet material 14. Therefore, the platen roller 23 is rotated to convey the sheet material 14 in the direction of the arrow b, and in synchronization with this, the heating element of the recording head 22 generates heat according to the image signal, thereby recording an image. has been done.

On the upstream side of the recording head 22 in the sheet conveying direction, there is an encoder roller 24 which is a driven rotating body that rotates following the conveying operation of the sheet material 14, and the sheet material 1.
A pressing roller 25 is provided which presses the encoder roller 24 via the roller 4. The rotation period of the encoder roller 24 is detected by a rotation detecting means, which will be described later, and the conveyance state of the sheet material 14 is detected.

Further, 26a and 26b are the sheet materials 1 after recording.
27a and 27b are a pair of discharge rollers for discharging the cut sheet material 14 out of the apparatus. Note that the ink cartridge 19 described above is installed on the document tray 1a side which also serves as the top cover of the device.
, a capstan roller 20, a guide shaft 21, a recording head 22, and a pressing spring 22a.When replacing the sheet material 14 or the ink sheet 18, the original tray 1a is rotated about the fulcrum 1b. hand,
This can be done by opening the top surface of recording system B.

The sheet material 14 pulled out from the sheet roll 14b and the ink sheet 18 fed out from the ink sheet supply roll 16 are pressed against the platen roller 23 by the recording head 22 at the recording position, and at this time, the sheet material 14 pulled out from the sheet roll 14b and the ink sheet 18 fed out from the ink sheet supply roll 16 are pressed against the platen roller 23 by the recording head 22 at the recording position. An image is recorded by causing the heating element of the recording head 22 to generate heat. The recorded sheet material 14 is guided to cutters 26a and 26b, and is cut page by page from the rear edge of the image.
27b, it is discharged out of the device.

[0022] C indicates the control unit of the entire facsimile machine, which includes various control boards, a modem board unit, and an NCU.
A board unit and the like are provided, and D indicates a power supply unit that supplies power to the entire device.

Next, the conveyance mechanism for the sheet material 14 and ink sheet 18 in the recording section B will be explained with reference to FIGS. 2 and 3. In FIG. 2, when the sheet material 14 is set in the recording section B, the sheet roll 14b is pulled out, and the sheet material 14 is conveyed while being nipped by the encoder roller 24 and the pressing roller 25, as well as the recording head 22 and the platen roller 23, respectively. It is possible. Further, the ink sheet 18 is fed out from the ink sheet supply roll 16, guided by a guide shaft 21, held between the recording head 22 and the platen roller 23, and then conveyed in the direction of arrow b by the capstan roller 20 to ink. The sheet is configured to be wound around a sheet winding roll 17.

Reference numeral 28 denotes a platen motor for rotating the platen roller 23 and conveying the sheet material 14. As the platen motor 28, a pulse motor or the like is used, for example, and by driving the platen motor 28 forward and backward, it is possible to convey the sheet material 14 in the directions of arrows a and b. Further, 29 is an ink sheet motor for rotating the take-up roll 17 and capstan roller 20 to convey the ink sheet 18. As this ink sheet motor 29, a pulse motor is used, for example, and conveys the ink sheet 18 in the direction of arrow b.

The capstan roller 20 has a core metal portion 20.
The rubber part 20b is made by spraying a thin layer (for example, 75 μm) of silicone rubber onto the outer peripheral surface of the metal core part 20a. The surface of the rubber portion 20b has high smoothness and is configured to have a high coefficient of friction (for example, 2 to 3 or more) with respect to the base film (for example, polyester film) on the back surface of the ink sheet 18.

The platen motor 28 has a motor gear 2.
It meshes with a platen gear 23a attached to the rotating shaft of the platen roller 23 via a shaft 8a. Further, the ink sheet motor 29 is meshed with a capstan gear 20c attached to one end of the core metal part 20a of the capstan roller 20 via a motor gear 29a, and this capstan gear 20c is connected to the ink sheet take-up roll 17. It meshes with a take-up gear 17b that is coaxially attached and rotates freely. Further, a slip clutch unit 30 is provided at the shaft end of the ink sheet take-up roll 17, and is configured to transmit only the counterclockwise rotation of the take-up gear 17b to the ink sheet take-up roll 17. ing. Therefore, the rotation of the platen motor 28 is controlled by the platen roller 2 through the motor gear 28a and the platen gear 23a.
3. In addition, the ink sheet conveyance motor 2
9 is transmitted to the capstan gear 20c and the take-up gear 17b via the motor gear 29a, and further transmitted to the ink sheet take-up roll 17 via the slip clutch unit 30.

The length of the ink sheet 18 to be wound onto the ink sheet take-up roll 17 by the rotation of the take-up gear 17b is longer than the length of the ink sheet 18 conveyed by the capstan roller 20. By setting the gear ratios of the stun gear 20c and the take-up gear 17b, the ink sheet 18 conveyed by the capstan roller 20 is taken up on the ink sheet take-up roll 17 without slack. and the amount of winding of the ink sheet 18 by the ink sheet winding roll 17;
An amount corresponding to the difference between the conveyance amount by the capstan roller 20 and the conveyance amount by the capstan roller 20 is absorbed by the slip clutch unit 30. This makes it possible to suppress fluctuations in the transport speed of the ink sheet 18 due to fluctuations in the winding diameter of the ink sheet winding roll 17.

Next, a rotation detecting means for detecting the rotation period of the encoder roller 24 will be explained with reference to FIG. The encoder roller 24 consists of a core metal 24a and a rubber part 24b, and the peripheral surface of the rubber part 24b is covered with the sheet material 1.
It is in contact with the back side of 4. Further, the pressing roller 25 presses the sheet material 14 against the encoder roller 24 using a spring (not shown) or its own weight. An impeller 31 is attached to one end of the core metal 24a of the encoder roller 24, and the impeller 31 rotates together with the encoder roller 24. Further, the impeller 31 has a core metal 24
It is divided into a plurality of blade portions 31a and slit portions 31b in the circumferential direction centering on a. The number of divisions is arbitrary, but in this embodiment, if the angle at which the encoder roller 24 rotates in response to conveyance of one line of the sheet material 14 is θ, the blade portion 31a and the slit portion 31b have the same width. It is divided so that it exists for each angle θ. Further, at the rotational position of the impeller 31, a transmission type photosensor 32 serving as rotation detection means is provided. This photo sensor 3
2 is formed into a U-shaped cross section with a light emitting part 32a and a light receiving part 32b facing each other, and when the encoder roller 24 rotates, the blade part 31a and the slit part 31b of the impeller 31 alternately rotate. It is configured to pass between the light emitting section 32a and the light receiving section 32b. Therefore, when the blade part 31a exists between the light emitting part 32a and the light receiving part 32b, the light emitted from the light emitting part 32a is blocked, so the input to the light receiving part 32b is Low (hereinafter simply referred to as "L"). ), and when the slit portion 31b exists, the light emitted from the light emitting portion 32a is transmitted to the light receiving portion 32.
b, the input to the light receiving section 32b becomes High (hereinafter simply referred to as "H").

Next, the sheet material 1 provided in the control section C
The configuration of a control means for controlling the conveyance operation of the ink sheet 4 and the ink sheet 18 will be explained with reference to the block diagram shown in FIG. 33 is a CPU which is a control means for controlling the recording section B. The CPU 33 receives an H or L output signal detected by the light receiving section 32b of the photosensor 32. Further, from the CPU 33, a recording head driver 34,
Drive pulses are sent to the platen motor driver 35 and the ink sheet motor driver 36, respectively, to drive the recording head 22, the platen motor 28, and the ink sheet motor 29, respectively. In addition, the CPU3
3, as will be described later, compares and calculates the detection result of the photosensor 32 and the drive input of the conveyance means, and when a conveyance failure of the sheet material is detected from the calculation result, performs a recovery operation to correct the conveyance state. or display a message to that effect to the user as necessary.

FIG. 5 shows drive pulses to the recording head 22, platen motor 28, and ink sheet motor 29 during the recording conveyance operation from the 1st line to the 10th line;
3 is a timing chart showing the relationship with the output pulse of the photosensor 32. FIG. In this embodiment, the recording conveyance operation is performed normally in the first to fourth lines, and there is an abnormality in the fifth line (for example, the ink on the ink sheet 18 is not transferred and peeled off on the sheet material 14, 14 arrow a
If a state in which the conveyance in the direction stops occurs, this is detected from the output of the photosensor 32, a recovery operation is performed during conveyance from the 6th line to the 8th line, and normal recording is performed from the 9th line onward. This shows the state of returning to transport operation.

Next, the recovery operation when an abnormality occurs in the recording and conveying operation of the sheet material 14 will be explained with reference to the flowchart shown in FIG. First, when the printing operation is started in step S1, the process moves to step S2, and the printing head 22, platen motor 28, and ink sheet motor 29 are each driven for one line, and the sheet material 1 is
4 and the ink sheet 18 for one line,
The recording head 22 generates heat to transfer ink onto the sheet material 14 to record one line.

Next, the process moves to step S3, and it is determined whether the output signal of the photosensor 32 is inverted. If the output signal is inverted, it is determined that a normal recording conveyance operation is being performed, and the process proceeds to step S4, where it is determined whether or not the recording operation of the last line is being performed. If so (in the case of YES), recording is ended, and if recording is to be performed again (in the case of NO), the process returns to step S2 to continue the recording conveyance operation.

In step S3, if the output signal of the photosensor 32 is not inverted, the sheet material 1
It is determined that the conveyance failure No. 4 has occurred, and the recovery operation from step S5 onwards is performed. First, in step S5, in order to prevent ignition due to abnormal heat generation of the recording head 22, the driving of the recording head 22 is stopped, and in order to separate the ink sheet 18 and the sheet material 14, the platen motor 28 and the ink sheet motor 29 are operated for one line. Minute drive. At this time, in order to ensure that the ink sheet 18 and the sheet material 14 are separated, it is preferable to increase the drive current and voltage in order to increase the torque of the platen motor 28 and ink sheet motor 29.

Next, in step S6, it is determined whether the output signal of the photosensor 32 is inverted. If the output signal is inverted, it is determined that a normal recording and conveying operation is being performed, and the recovery operation is completed and the process returns to step S2 to restart the recording and conveying operation. Further, in step S6, if the output signal of the photosensor 32 is not inverted, it is determined that the sheet material 14 is being conveyed poorly, and the process proceeds to step S7, where the steps are continued until a predetermined time elapses. Return to S5 and repeat the recovery operation. If the predetermined time has elapsed in step S7, it is determined that the recovery operation is impossible, and the recording conveyance operation is stopped, and the process proceeds to step S8, where an alarm is issued to notify the user of the occurrence of conveyance failure.

Note that the recovery operation described above is not limited to this embodiment, and a method can be adopted depending on the configuration of the apparatus and the type of defective sheet material conveyance. For example, if the conveyance failure is caused by the ink sheet 18, the platen motor 2
8 may be stopped, the ink sheet motor 29 may be driven to transport the ink sheet 18 by a predetermined amount, and then the recording operation may be resumed. Further, if the ink on the ink sheet 18 melts on the sheet material 14 and then cools and solidifies and sticks, the platen motor 28 and the ink sheet motor 2
It is also possible to resume recording after stopping the recording head 9 and driving the recording head 22 to generate heat to melt the ink and separate the ink sheet 18 and the sheet material 14. Furthermore, the sheet material 1 of the encoder roller 24
It is desirable that the portion in contact with the sheet material 14 be configured to reduce slippage with the sheet material 14 by being made of a material with a high friction coefficient, knurled, or roughly polished.

Next, the recording operation of the recording apparatus configured as described above will be explained. The control unit C controls the platen motor 28, ink sheet motor 29, and recording head 2.
The recording operation is started by driving 2. First, when a predetermined number of pulses are input to the platen motor 28, the platen roller 23 is rotated by a predetermined amount to convey the sheet material 14 by one line in the direction of arrow a shown in FIG. At the same time, a predetermined number of pulses are input to the ink sheet motor 29, and the capstan roller 20 rotates by a predetermined amount to move the ink sheet 18 along the arrow b.
transport in the direction. Then, the recording head 22 is driven to generate heat according to the recording information, and one line of ink on the ink sheet 18 is melted and peeled off and transferred to the sheet material 14. In this way, each time recording for one line is completed, each of the above-mentioned parts is driven to carry out recording and conveyance operations for the next line and subsequent lines, and images are recorded on a page-by-page basis. The sheet material 14 after recording is cut by a cutter 26
a, 26b, and cut into pages by ejection roller 27a.
, 27b to the outside of the device.

Next, the input to the photosensor 32 changes in accordance with the conveyance of the sheet material 14. For example, assume that the blade portion 31a of the impeller 31 is located in the gap between the photosensors 32, and the input to the light receiving portion 32b is L. As described above, when the sheet material 14 is conveyed by one line in the direction of the arrow a, the encoder roller 24 and the impeller 31 rotate together by an angle θ in the direction of the arrow c shown in FIG. Since the slit portion 31b is located in the gap, the input to the light receiving portion 32b becomes H. When the sheet material 14 is further conveyed by one line, the input to the light receiving section 32b becomes L again. An input signal to the photo sensor 32 indicating the rotation period of the encoder roller 24 is transferred to the control section C, and the control section C inputs the photo sensor 32 alternately between H and L for each recording conveyance operation for one line. By switching to , it is detected that the conveyance state of the sheet material 14 is normal.

Furthermore, even though the sheet material 14 has been recorded and conveyed for one line, the photosensor 32
If the input does not change, it is detected that the conveyance state of the sheet material 14 is abnormal, the recording conveyance operation is stopped, the recovery operation is performed by the control section C as described above, and an alarm sound is emitted and the display is The user is informed of the abnormality by displaying a message on the section 13 or by lighting a lamp. In addition, when a conveyance abnormality is detected, the input current of the platen motor 28 is increased to increase the conveyance force,
It is also possible to perform various recovery operations such as releasing the pressure on the recording head 22 by a drive means (not shown).

In the above embodiment, the number of divisions of the impeller 31 is not limited to this embodiment, and may be set arbitrarily, and the input of the photosensor 32 is Instead of changing, it is also possible to configure the input of the photosensor 32 to change according to the recording and conveying operation of a plurality of lines. Further, the rubber portion 24b of the encoder roller 24 does not need to have the same width as the sheet material 14, and it is sufficient that the rubber portion 24 is in contact with a portion of the sheet material 14. In addition, the core metal 24a, the rubber part 24b and the impeller 3
1 can also be integrally molded from a material such as plastic. Further, by providing an impeller 31 and a photosensor 32 similar to those of the encoder roller 24 described above at one end of the auxiliary roller 15a, it is also possible to make the auxiliary roller 15a function similarly to the encoder roller 24.

Furthermore, in the above embodiment, the encoder roller 24 is arranged in the recording section B, but as shown in FIG. The conveyance state of the original 1 can also be detected by arranging the encoder roller 37 and the pressing roller 38 to sandwich the original 1.

Furthermore, the encoder rollers 24, 37
It is also possible to leave the pressing rollers 25 and 38 in contact with the sheet material 14 and the original 1, respectively, and omit the pressing rollers 25 and 38. In this case, for example, the sheet material 14 on the platen roller 23 may be affected by friction due to contact with the recording head 22,
Since it receives back tension due to the weight of 4b, slipping occurs between it and the planter roller 23. However, since the encoder roller 24 is provided separately from the other rollers on the conveyance path of the sheet material 14, no other force acts on the sheet material 14 on the encoder roller 24, and no slipping occurs. Therefore, the encoder roller 24 rotates at an angle proportional to the amount of conveyance of the sheet material 14. Further, the document 1 is also subjected to frictional resistance by the separation roller 4a and the separation pressing piece 4b, and slips between the pair of transport rollers 5a, 5b and the pair of discharge rollers 6a, 6b. However, since the encoder roller 37 is provided separately from the other rollers on the conveyance path of the document 1, there is no slippage between the document 1 and the encoder roller 37, and the encoder roller 37 does not adjust to the conveyance amount of the document 1. Rotate at a proportional angle. Therefore, in either case, the conveyance state of the sheet material 14 and original document 1 can be detected accurately.

In the above-mentioned embodiment, so-called multi-printing was exemplified in which the sheet material 14 and the ink sheet 18 are conveyed in opposite directions to perform recording, but it is also possible to convey both sheets 14 and 18 in the same direction and perform recording. Of course, even one-time printing is possible. Furthermore, 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 roller-shaped ones,
It is also possible to use other types, such as a rotating belt.

Next, another embodiment of the rotation detecting means for detecting the rotation period of the encoder roller 24 in the above embodiment will be described with reference to FIG. In this embodiment, instead of the impeller 31, a disk 39 is provided at the end of the core metal 24a, which is the rotating shaft of the encoder roller 24. A black part 39a and a white part 39b are formed on the side surface of the disc 39, which are divided radially at a predetermined angle θ, and the black part 39a and the white part 39b are printed, etc. so that they have different light reflectances. has been applied. Further, 40 is a reflective photosensor, and the disk 39
It is placed opposite the side of the This photo sensor 4
0, the black portion 39a and white portion 39b of the disk 39 are irradiated with light, and the reflected light is input again. Therefore, when the encoder roller 24 rotates, the disc 39 also rotates together, and the photosensor 40 alternately detects the black portion 39a and the white portion 39b and transfers the input signal to the control unit C. , the conveyance state of the sheet material 14 can be detected in the same manner as in the previous embodiment.

[0044]

Effects of the Invention As described above, the present invention provides a sheet material conveying device that detects the rotation period of the driven rotary body that rotates during the conveyance of the sheet material by providing a rotation detecting means to detect the recording operation. The conveyance state of the sheet material can be detected at all times, regardless of whether the sheet material is inside or not. In addition, in a recording device, by immediately detecting a conveyance failure of the sheet material, it is possible to prevent device troubles (for example, jams, ink sheets running out, damage to the recording head, etc. in the recording section, reading failures, etc. in the document reading section). ) can be prevented from occurring and the reliability of the device can be improved.

[Brief explanation of drawings]

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

FIG. 2 is a perspective explanatory view of a sheet material conveying device.

FIG. 3 is an explanatory diagram of the main parts of the sheet material conveying device.

FIG. 4 is a block diagram showing a control means of the sheet material conveying device.

FIG. 5 is a timing chart showing the relationship between the drive pulse of the recording conveyance means and the output pulse of the rotation detection means.

FIG. 6 is a flowchart showing a sheet material conveyance operation.

FIG. 7 is an explanatory diagram of another example of rotation detection means.

FIG. 8 is an explanatory diagram of a conventional sheet material conveying device.

FIG. 9 is an explanatory diagram of a conventional sheet material conveying device.

[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, 8a and 8b are mirrors, and 9 is a 10 is a photoelectric conversion element, 11 is a discharge tray, 12 is an operating section, 13 is a display section, 14 is a sheet material, 14a is a winding core, 14b is a sheet roll, 15 is a roll holder, 15a is an auxiliary roller, 16 is a Ink sheet supply roll, 16a and 17a are cores, 17 is an ink sheet take-up roll, 17b is a take-up gear, 18 is an ink sheet,
19 is an ink cartridge, 19a is a cassette, 20 is a capstan roller, 20a, 24a are core metals, 20b,
24b is a rubber part, 20c is a capstan gear, 21 is a guide shaft, 22 is a recording head, 22a is a spring, 23 is a platen roller, 23a is a platen gear, 24
, 37 are encoder rollers, 25 and 38 are pressing rollers, 2
6a and 26b are cutters, 27a and 27b are a pair of discharge rollers, 28 is a platen motor, 28a and 29a are motor gears, 29 is an ink sheet motor, 30 is a slip clutch unit, 31 is an impeller, 31a is a blade portion, and 31b is a slit portion. , 32, 40 are photosensors, 32a is a light emitting part, 3
2b is a light receiving section, 33 is a CPU, 34 is a recording head driver, 35 is a sheet material conveyance driver, 36 is an ink sheet conveyance driver, and 39 is a disk.

Claims (5)

[Claims] 1. A sheet comprising a conveyance means for conveying a sheet material, a driven rotary body that rotates as the sheet material is conveyed, and a rotation detection means for detecting a rotation period of the driven rotary body. Material conveyance device. 2. The sheet material conveying apparatus according to claim 1, further comprising a control means for comparing and calculating the detection result of the rotation detecting means and the drive input of the conveying means, and detecting a conveyance failure of the sheet material from the result of the calculation. . 3. The sheet material conveying apparatus according to claim 2, wherein the control means performs a recovery operation to correct the conveyance state when detecting a conveyance failure of the sheet material. 4. The sheet material conveying apparatus according to claim 3, wherein the control means includes a display section that displays a defect to the user when a conveyance defect of the sheet material is detected. 5. A recording apparatus comprising the sheet material conveying device according to any one of claims 1 to 4, and a recording means for recording an image on the sheet material according to recording information.