JPH06143722A - Rotation detector and recording apparatus - Google Patents

Abstract

PURPOSE:To provide an inexpensive rotation detector easy to control by providing the revolving member revolved by specific quantity in a reversal direction so as to follow the rotation of a rotary body such as a roller feeding a sheet material such as recording paper and detecting the revolving position of the revolving member. CONSTITUTION:A facsimile device forms an image on a recording sheet in such a state that a recording head is pressed to a platen roller 10b so as to hold the recording sheet between the head and the roller 10b. A sensor arm 73 is attached to the shaft part 10b1 of the platen roller 10b through a slide clutch means containing a spring 72 in order to detect the rotation of the platen roller 10b and a photosensor 75 and a stopper 76 are arranged on both sides of the sensor arm 73. When the platen roller 10b is forwardly rotated, the light path of the photosensor 75 is blocked by the shutter part 73c of the sensor arm 73 and, therefore, the output of the photosensor 75 is set to L and, when the roller 10b is reversed, the sensor arm 73 is rotated in the same direction to open the light path and output H is generated from the photosensor 75.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device for detecting a rotating state of a rotating body such as a roller, a motor and a gear for conveying a sheet material such as recording paper or a film, and a recording device having the rotation detecting device. It is a thing.

[0002]

[Prior art]

(1) Conventionally, a rotation detecting device that detects a rotating state of a rotating body such as a roller, a motor, and a gear that conveys a sheet material such as a recording paper or a film is incorporated in various devices. For example, description will be made with reference to an example incorporated in the printer shown in FIG. Reference numeral 111 is a recording paper wound with a heat-sensitive paper that is colored by heat. The recording paper 111 is conveyed by a platen roller 112 that rotates in the clockwise direction in the figure, an image is recorded by a recording head 113, further cut into pages by a cutter 114, and then ejected. 1
Reference numeral 15 is a jam (paper jam) sensor, which is a recording paper 1
The front and rear ends of 11 are detected.

The jam sensor 115 is defective until a one-page recording is completed and ejected when a conveyance failure occurs during recording (for example, when the recording paper 111 is wrapped around the platen roller 112 as indicated by a broken line). Can not be detected. During this period, the platen roller roller 112 continues to be in a poor rotation state, which may cause serious troubles such as damage of the recording head 113 and abnormal heat generation of the motor.

As a countermeasure against this, conventionally, a slit disk 116 having a slit 116a formed in the circumferential direction is provided coaxially with the platen roller 112 and is configured to rotate integrally with the platen roller 112. There is. 11
Reference numeral 7 denotes a sensor, which detects the rotation state of the platen roller 112 by irradiating the disc portion 116b of the slit disc 116 with light and taking the output difference obtained by the reflection as a pulse into the control portion. .

(2) Further, with the development of information processing systems today, various information processing devices have been developed and put into practical use. Among these devices, recording devices such as facsimile machines and printers are widely used not only in offices but also in general processes.

[0006] In these recording apparatuses, a so-called heat-sensitive recording method using a heat-sensitive sheet that develops color by heating is generally used in order to facilitate miniaturization, but in recent years, an ink sheet is used. A recording device using a so-called thermal transfer recording system has also been developed and put into practical use. For example, Figure 19
The description will be made with reference to the recording unit of the facsimile apparatus shown in FIG.

As shown in FIG. 19, an ink sheet 121 having a base film coated with ink is wound around a supply reel 122a and a take-up reel 122b and loaded into the apparatus main body. The ink sheet 121 wound around the supply reel 122a is conveyed so as to be wound around the take-up reel 122b. The recording sheet 125 wound in a roll is conveyed by the platen roller 126,
The recording head 124 is configured so that the ink sheet 121 and the recording sheet 125 are overlapped and pressed. At the time of recording, the ink sheet 121 is conveyed by the cooperative action of the conveying roller 123a and the pinch roller 123b which are rotationally driven, and the recording sheet 125 is conveyed by the platen roller 126. And the recording head 12
4, an image is recorded on the recording sheet 125 according to the image information.
At 27, the page is cut and discharged.

[0008]

[Problems to be Solved by the Invention]

(1) However, the above-described conventional rotation detecting device has the following drawbacks. Control is complicated. Since the output of the photo sensor changes even during normal rotation, the control unit must always measure the timing of the captured pulse.If rotation failure occurs, the pulse timing should be changed to the pulse for normal rotation. It can be finally recognized as a defect by comparing with the timing, and it takes time from the occurrence of the rotation defect to its detection. High cost. In order to improve the detection accuracy, it is necessary to increase the number of notches in the slit disk, which makes processing difficult and increases the cost. The direction of rotation cannot be detected. When the rotation failure state is normal (hereinafter referred to as "forward rotation") and the rotation direction is opposite (hereinafter referred to as "reverse rotation"), the pulse timing is the same both during normal operation and during failure. Failure detection is impossible. In particular, when the rotating body is driven by a step motor, reverse rotation is likely to occur due to a step-out phenomenon caused by poor rotation. This may cause not only the reverse conveyance jam of the recording sheet but also various troubles. For example, in a fax machine,
In the configuration that uses one motor and clutch to drive the scanner roller in forward rotation and the cutter in reverse rotation,
Out-of-step reverse rotation of the motor due to poor rotation of the scanner roller causes the cutter to operate, resulting in a double trouble of abnormal cutting. Therefore, it is necessary to immediately detect the reverse rotation of the rotating body.

(2) In the thermal transfer recording apparatus, if the ink is excessively melted due to a malfunction of the recording head 124, the ink sheet 121 is replaced with the recording sheet 1.
After the ink is transferred so as to be superposed on No. 25, there is a possibility that a “sticking” phenomenon may occur in which the ink cannot be peeled off and is adhered. For example, as shown in FIG.
5 is conveyed in the same direction as that of the recording sheet 125, the stuck ink sheet 121 is recorded on the recording sheet 125 as shown by a dotted line.
It is conveyed together with it and cut by the cutter 127.

The ink sheet 121 is replaced with the recording sheet 12
When the recording sheet 125 is conveyed in the direction opposite to 5, the recording sheet 125 may be returned together with the ink sheet 121, and the wound ink sheet 125 may be damaged. Further, the conventional recording apparatus cannot detect such a sticking phenomenon, and when such a trouble occurs, the apparatus main body may not be repairable.

An object of the present invention is to solve the above-mentioned problem (1) of the prior art and to provide a rotation detecting device which can detect the rotating direction of a rotating body and which can be easily controlled at low cost.

Another object of the present invention is to solve the above-mentioned problem (2) of the prior art, prevent the sticking phenomenon between the ink sheet and the recording material, and improve the reliability and safety of the recording apparatus. To provide.

[0013]

A typical means for solving the above-mentioned problem (1) of the prior art and applied to the embodiments described below is a rotating body and the rotating body from the forward rotation direction to the reverse rotation direction. A rotation member capable of rotating a predetermined amount in the reverse direction when the rotation of the rotation member is started, and a detection unit for detecting a rotation position of the rotation member. It is characterized by

Typical means for solving the above-mentioned problem (2) of the prior art and applied to the embodiments described below are a recording material conveying means for conveying a recording material and an ink sheet. For transporting an ink sheet, recording means for recording an image on the recording material by acting on the ink sheet, and the rotation detecting device provided in at least one of the recording material transporting means and the ink sheet transporting means. And a control means for controlling the driving of the recording material conveying means and the ink sheet conveying means, respectively, according to the output signal of the rotation detecting device.

[0015]

According to the above-mentioned means (1), the rotating arm rotates following the rotating direction of the rotating body, and the position of the rotating arm is detected by the detecting means.

According to the above means (2), when the sticking of the recording material and the ink sheet is detected by the rotation detecting device received by at least one of the recording material conveying means and the ink sheet conveying means, the control means causes The driving of the recording material conveying means and the ink sheet conveying means are controlled respectively.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording apparatus to which the above means is applied will be described below with reference to the drawings.

[First Embodiment] A recording apparatus B according to this embodiment is configured as a recording system of a facsimile apparatus.
It is generally called a thermal transfer recording device. 1 is an explanatory view of the entire structure of the facsimile apparatus, FIG. 2 is an external perspective view thereof, FIG. 3 is an explanatory view of a cross section of an ink sheet, FIG. 4 is an explanatory view of the development of an ink sheet cartridge, and FIG. 5 is a slip clutch on the supply reel side. 6 is an explanatory view of the structure of the slip clutch on the take-up reel side, FIG. 7 is an explanatory view of the ink sheet transport path, FIG. 8 is an explanatory view of the thermal head structure, and FIG.
10 is an explanatory view of the drive transmission configuration, FIGS. 10 and 11 are detailed views of the rotation detection unit, FIG. 12 is a block diagram of a recording control system, and FIG. 13 is an explanatory view showing electrical connection between the control system and the recording system. 14 is a time chart showing the recording operation, and FIG. 15 is a time chart showing the operation of the rotation detector.

(Description of Entire Facsimile) First, the overall structure of the facsimile will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, this facsimile apparatus has a paper feed system A for supplying recording sheets, a recording system B as a recording device, a reading system C for reading an image written on a document, an operation section D, and It is constituted by the loaded ink sheet cartridge E.

The paper feed system A separates and feeds the recording sheets 2 placed in the paper feed cassette 1 one by one by a paper feed section consisting of a paper feed roller 3 and a paper feed piece 4 in pressure contact therewith, The recording sheet 2 is conveyed by the pair of feed rollers 5a and 5b,
It is supplied to the recording system B described later. Further, the conveyance path of the recording sheet 2 forms a semicircular path which turns the recording sheet 2 upside down by the guides 6a and 6b. Furthermore, recording system B
A recording sheet front end sensor 7 such as a photo sensor and a micro switch for detecting the front end position of the recording sheet 2 is provided in the vicinity of the position. The paper feed cassette 1 is provided so as to be attachable to and detachable from the main body 8 of the apparatus, and also includes a paper feed roller 3, a paper feed piece 4, feed roller pairs 5a and 5b, and a guide 6.
The a, 6b and the recording sheet leading edge sensor 7 are provided in the apparatus main body 8, respectively.

The recording system B responds to an image signal transmitted from another device or an image signal transferred from a reading system C described later.
An image is recorded on the recording sheet 2 supplied by the paper feed system A. That is, the recording head 10 which constitutes the recording means 10 described later with the superposed recording sheet 2 and ink sheet 9 is formed.
By pressing the platen roller 10b side by a and driving and rotating the platen roller 10b in the arrow direction of FIG. 1, the recording sheet 2 is conveyed in the arrow a direction, and the ink sheet 9 is moved in the arrow b direction by the drive mechanism described later. Transport.
The ink applied to the ink sheet 9 is melted by causing the recording head 10a to generate heat in response to an image signal in synchronism with the conveyance of the recording sheet 2 and the ink sheet 9 (including sublimation, the same applies hereinafter).
Then, the melted ink is transferred to the recording sheet 2 to form an image.

The recording sheet 2 on which a predetermined image is formed
Is further conveyed in the direction of the arrow a, passes through the path formed by the discharge guides 11a and 11b, and is conveyed by the pair of discharge rollers 12a and 12b to be discharged to the outside of the apparatus. Also, the discharge roller pair
Near the front of 12a and 12b, a recording sheet discharge sensor 13 such as a photo sensor for detecting passage of the recording sheet 2 and a micro switch is provided. Also, the platen roller 10b
A rotation detection unit F described later is provided at the end of the.
The platen roller 10b, the discharge guides 11a and 11b, the discharge roller pairs 12a and 12b, and the recording sheet discharge sensor 13 are provided in the apparatus main body 8, respectively.

Further, the ink sheet 9 is housed in an ink sheet cartridge E having a structure which will be described later in this embodiment. The ink sheet cartridge E is loaded in a predetermined position of the apparatus main body 8 and the recording head 10a is The recording cover 15 is provided at a predetermined position as a lid body that is configured to be rotatable via a rotation shaft 14.

On the other hand, the reading system C irradiates the original 16 with light and converts the reflected light into an electric signal, and transmits this signal to another device according to the operation mode or transfers it to its own recording system B. It is a thing. That is, a plurality of originals 16 are placed on the original placing table 15a formed on the upper surface of the recording cover 15, and the originals 16 are pre-conveyed by the pre-conveying roller 17a and the pressing piece 17b, and the separating roller 18a and the pressing roller 17a Are separated and fed one by one by a pressure contact piece 18b, and the original 16 is conveyed by a pair of conveying rollers 19
a, 19b and a pair of discharge rollers 20a, 20b to convey and discharge to a discharge tray 21. Then, while the document 16 is being conveyed, image information is read by the photoelectric conversion element 22 such as a contact sensor, and the image signal is transferred to its own recording system in the copy mode, and is transferred to another device in the transmission mode. It is configured to send to the recording system.

As shown in FIG. 2, the operation section D is a panel for performing the mode switching operation, the copy operation, the transmission operation, etc., and is provided with keys corresponding to various operations. The operation section D is provided above the document conveying mechanism in the reading system C, and is rotatable with respect to the apparatus body 8. In addition, transmission to one end side of the operation unit D
A handset 23 of a telephone for receiving is equipped.
Incidentally, in FIG. 1, reference numerals 24a and 24b are electrical equipment substrates.

Next, the structure of each part of the paper feed system A, the recording system B, the ink sheet cartridge E, etc. will be specifically described.

(Paper feed cassette) The paper feed cassette 1 comprises a box-shaped orchest 1a for accommodating a plurality of recording sheets 2, an intermediate plate 1b, an upper guide 1c and a lid 1d. A predetermined amount is placed between 1b and the upper guide 1c. The middle plate 1b is rotatably provided on the lower surface of the placed recording sheet 2 with one end as a fulcrum, and is pushed up by a pushing-up plate 25 described later to bring the uppermost recording sheet 2 into pressure contact with the paper feed roller 3. It is a thing. Further, the upper guide 1c is fixed at a predetermined position so that the uppermost recording sheet 2 is always kept at the predetermined position.

The push-up plate 25 is rotatably supported by the main body 8 of the apparatus, and is given a rotational force in a direction to push up the intermediate plate 1b by a force of a spring or the like (not shown).
Therefore, as the number of the placed recording sheets 2 decreases, the intermediate plate 1b is rotated by the rotational force of the push-up plate 25, and the uppermost recording sheets 2 are sequentially conveyed. Lid 1d
Is detachably provided on the upper surface of the pocket 1a, prevents dust from adhering to the recording sheet 2, and also functions as a tray for placing the recording sheet 2 discharged to the outside of the apparatus after recording is completed. As shown in FIG. 2, the end and side of the lid 1d are slanted to stabilize the placement of the recording sheet 2, and the center of the lid 1d holds the pocket 1a when the sheet cassette 1 is attached or detached. Notches are provided to make it easier to hold.

Further, the paper feed cassette 1 is provided so as to be attachable to and detachable from the main body 8 of the apparatus, and is pulled out to the left in FIG. 1 to be removed from the main body 8 of the apparatus, and inserted into the right side of FIG. While being guided by the guide portions 8b and 8c, the apparatus main body 8 is mounted at a predetermined position (position shown in FIG. 1).

(Paper Feed Unit) The paper feed roller 3 is a roller made of a material having a high friction coefficient such as silicon rubber, and has an arc portion 3a and a flat portion 3b, and rotates in the direction of the arrow in FIG. By doing so, the uppermost recording sheet 2 in the paper feed cassette 1 is fed out. Further, circular rollers (not shown) having substantially the same outer diameter as the circular arc portion 3a are provided at both ends of the paper feed roller 3. The sheet feed piece 4 rotatably supports a sheet portion 4a such as urethane rubber containing cork by an arm portion 4b, and is pressed toward the sheet feed roller 3 by a spring or the like (not shown). Therefore, when the arc portion 3a is in a position facing the sheet portion 4a, the paper feed piece 4 is in pressure contact with the arc portion 3a of the paper feed roller 3. On the other hand, the flat portion 3b is the seat portion 4
When it is in a position facing a, the paper feed piece 4 is in pressure contact with the circular rollers (not shown) at both ends of the paper feed roller 3a, and the recording sheet is placed between the paper feed roller 3 and the paper feed piece 4. A space through which 2 passes is formed.

In the recording standby state, the sheet feeding roller 3 is at a position where the flat surface portion 3b faces the recording sheet 2 and the sheet feeding piece 4 (the position shown in FIG. 1, hereinafter referred to as the sheet feeding standby position). When the sheet feeding roller 3 is rotated in the direction of the arrow in FIG. 1 by a drive source described later, the arc portion 3a comes into contact with the recording sheet 2 to feed the uppermost recording sheet 2. At this time, when a plurality of recording sheets 2 are fed out, the lower recording sheet 2 is prevented from being conveyed by the contact friction with the sheet portion 4a, so that only the uppermost recording sheet 2 is fed by the feed roller pair 5a. , 5b, and thereafter the recording sheet 2 is conveyed by the feed roller pair 5a, 5b. The paper feed roller 3 rotates once by a clutch means such as an electromagnetic clutch, and then stops rotating at the paper feed standby position described above. Therefore, the recording sheet 2 is conveyed to the recording system B by the pair of feed rollers 5a and 5b without coming into contact with the paper feed roller 3.

(Recording Sheet) As the recording sheet 2, it is possible to use plain paper, a plastic sheet or the like and other materials that can transfer ink. In this embodiment, plain paper cut into B4 size or A4 size is used as the recording sheet 2. The paper feed cassette 1 containing the recording sheet 2 is stored in a predetermined position (position shown in FIG. 1) of the apparatus body 8. Further, in this embodiment, the recording sheet 2 is used to reduce the running cost.
A so-called multi-printing method is adopted in which recording is performed by making the conveying speed of the ink sheet 9 slower than the conveying speed of.
In this multi-print method, the conveyance length l of the ink sheet 9 is shorter than the conveyance length L of the recording sheet 2 at the time of recording, and recording is performed with (L / l = n> 1). By doing so, the recording sheet 2 and the ink sheet 9
Conventional recording method with the same transport length (L / l = 1)
The use efficiency of the ink sheet 9 can be increased n times as compared with

(Ink Sheet) The ink sheet 9 is configured so that ink transfer can be performed n times at the same portion in order to perform multi-printing as described above. Therefore, in this embodiment, as shown in FIG. 3, four layers, that is, the first heat-resistant coating layer 9a, the second base film layer 9b, the third ink layer 9c, and the fourth top coating layer 9d are used. It is composed.

The heat-resistant coating layer 9a protects the base film layer 9b from the heat of the recording head 10a which is a thermal head. This heat-resistant coat layer 9a is suitable for multi-printing in which heat energy for n lines may be applied to the same place (when heat generation information is continuous), but whether or not to provide this heat-resistant coat layer 9a May be appropriately selected according to the recording method. It is effective to provide the heat resistant coat layer 9a on a base film having a relatively low heat resistance such as a polyester film.

The base film layer 9b of the second layer serves as a support for the ink sheet 9, and in the case of multi-printing, thermal energy is applied to the same location many times.
Aromatic polyamide film and capacitor paper, which have high heat resistance, are advantageous, but conventional polyester film can also be used. It is advantageous in terms of printing quality that these thicknesses are as thin as possible from the role of a medium, but strength must be taken into consideration and about 3 to 8 μm is preferable.

The third ink layer 9c is the recording sheet 2
Is a layer containing an amount of ink capable of being transferred n times. This ink component is a resin such as EVA as an adhesive, carbon black or nigrosine dye for coloring,
Carnauba wax, paraffin wax, etc. as a binding material are used as a main component, and they are blended to withstand use n times at the same location. The different sensitivity and concentration by the coating amount of the ink layer 9c, which may be arbitrarily selected ^{but, 4g / m 2 ~9g / m} 2 is preferably about.

The fourth top coating layer 9d is a non-recording portion, and the third ink layer 9c is formed on the recording sheet 2.
To prevent pressure transfer of the toner, and is generally composed of a transparent wax or the like. As a result, only the transparent top coating layer 9d is pressure-transferred to the recording sheet 2 in the non-recording portion, and the background stain of the recording sheet 2 is prevented.

The constitution of the ink sheet 9 is not limited to that of this embodiment, and for example, a base layer serving as a support and a porous ink holding layer containing ink provided on one side of the base layer. Or a heat-resistant ink layer having a fine porous network structure formed on a base film, and the ink is contained in the ink layer. Examples of the material of the base film layer 9b include polyimide, polyethylene, polyester,
It may be a film made of polyvinyl chloride, triacetyl cellulose, nylon or the like, or paper. Further, the heat-resistant coating layer 9a is not always necessary, but as the material thereof, for example, silicone resin, epoxy resin, fluororesin,
It may be etrocellulose or the like. Further, as an example of the ink sheet 9 having the heat sublimation ink, spacer particles and dye formed of guanamine-based resin and fluorine-based resin on a base material formed of polyethylene terephthalate, polyethylene naphthalate, aromatic polyamide film or the like. An ink sheet provided with a color material layer containing is included. In this embodiment, the ink sheet 9 is loaded in the ink sheet cartridge E in order to facilitate handling.

{Ink Sheet Cartridge} As shown in FIG. 4, the ink sheet cartridge E comprises a supply reel 26 serving as a first winding member, a take-up reel 27 serving as a second winding member, and an ink sheet conveying means. The capstan roller 32 is attached to the frame 28 so as to be rotatable in parallel to the predetermined position, and the ink sheet 9 wound around the supply reel 26.
Is attached to the take-up reel 27 side to load the ink sheet 9. By using this ink sheet cartridge E, the ink sheet 9 for the recording system B is
Can be loaded extremely easily and surely in a stable state. When the ink sheet 9 is used up, the ink sheet cartridge E is discarded together with the ink sheet 9. That is, since the ink sheet cartridge E is disposable, it is required that it can be provided at a low cost.
Next, the configuration of each part of the ink sheet cartridge E will be specifically described.

(Frame) The frame 28 in this embodiment has a first casing 28a and a second casing 28b ultrasonically welded together. That is,
As shown in FIG. 4, the welded portions 28c1 and 28c2 of the connecting portion between the first housing 28a and the second housing 28b are ultrasonically welded to each other, and the first housing 28a and the housing 28a are substantially attached to the front and side ends thereof. Formed welded parts 28a1, 28
a4 and a welded portion formed at substantially the front end and the side end of the second housing 28b
It is configured by ultrasonically welding 28b1 and 28b6. The welded portions 28a1, 28b1 and 28c1, 28c2 may be formed over the entire length or may be formed intermittently with a predetermined length in the ink sheet width direction. As a molding material for the frame 28, a resin such as polypropylene resin or ABS resin can be used. In the frame 28, a recording head 10a is provided at a substantially central portion of the first housing 28a as shown in FIG.
A window 28d for inserting the second housing 28 is formed.
A window for inserting the platen roller 10b at approximately the center of b
28e is formed, and a cutout for escaping the shaft portion 10b1 (see FIG. 1) of the platen roller 10b continuously to the window 28e.
28e1 is formed.

Side plates 28a2, 28b2 are formed upright on both side surfaces of the first casing 28a and the second casing 28b, respectively. A curved surface is formed. A fitting hole 28a3 is formed in the welded portion 28a1 formed at the open side curved surface end of the first housing 28a, and a welded portion formed at the open side curved surface end of the second housing 28b.
28b1 is formed with a fitting protrusion 28b3 which is fitted into the fitting hole 28a3. Furthermore, when the ink sheet cartridge E is attached to the apparatus main body 8 on the open side curved surface of the second housing 28b,
A locking protrusion 28b4 that engages with a U-shaped groove (not shown) provided on the main body 8 is formed. Side plate 28b2 of the second housing 28b
Guide pins 28f that serve as guides when the ink sheet cartridge E is attached to the apparatus main body 8 are formed at predetermined positions on both sides of.

A U-groove 28 which fits with a bearing 29a mounted on one end of the supply reel 26 is provided at a predetermined position of the side plates 28a2, 28b2.
g1 and a square groove 28 for fixedly supporting the shaft 30a of the slip clutch 30 attached to the other end of the supply reel 26 as described later.
g2 is formed. Further, the side plates 28a2, 28b2 have a U-groove 28g3 fitted with a bearing 29b mounted on one end of the take-up reel 28.
As described later, a U groove 28g4 into which the shaft portion 31a of the slip clutch 31 attached to the other end of the take-up reel 27 is fitted is formed. Further, the side plates 28a2 and 28b2 have bearings 32a of a capstan roller 32, which serves as an ink sheet conveying member described later.
U-grooves 28g5 and 28g6 are formed to fit in. Further, an opening 28h for exposing the reel gear 33 of the take-up reel 27 is formed in the second housing 28b.

(Supply Reel and Slip Clutch) The supply reel 26 is for winding the ink sheet 9.
As shown in FIG. 4, this is because the flange 26b1 is provided at both ends of the reel shaft 26a having a length substantially the same as the width of the ink sheet 9.
26b2 is provided, a bearing 29a is loaded on one flange 26b1 side, and a slip clutch 30 which is a tension applying means is attached to the other flange 26b2 side. The slip clutch 30 is for applying back tension to the ink sheet 9 drawn from the supply reel 26. As shown in the exploded view of FIG. 5 (a) and the sectional view of FIG. 5 (b), this slip clutch 30 is mounted so that a spring 30b is tightened on a shaft 30a having two-sided ends. A hook portion 30b1 is formed on the spring 30b. Then, the shaft 30a to which the spring 30b is attached is inserted into the through hole 30c1 of the collar 30c, and the E ring 30d is attached to the tip of the shaft 30a to prevent the shaft 30a from coming off. At this time, the hook portion 30b1 of the spring spring 30b is a recess formed in the through hole 30c1.
Attach it so that it will lock to 30c2. Further, the flange 30c is fitted into a hollow reel shaft 26a, and a convex portion 30c3 protruding from the outer peripheral portion of the flange 30c is formed in a U-shaped groove 26 at the end of the reel shaft 26a.
Insert it into c and lock it.

In the above structure, the supply reel 26 is connected to the frame 28.
When the ink sheet 9 is pulled out with it attached to
The supply reel 26 rotates in the direction of arrow c in FIG. 5A (the direction in which the ink sheet 9 is fed). At this time, the shaft 30a is a frame
Since it fits into the square groove 28g2 of 28 and cannot rotate,
The spring spring 30b tightening the spring 30a receives a rotational force in the loosening direction, and a friction load is generated between the outer circumference of the shaft 30a and the inner circumference of the spring spring 30b. When the ink sheet 9 receives a conveying force and the supply reel 26 receives a rotational force of a predetermined torque or more, this spring load causes the spring 30b to rotate the shaft 30a.
Glide around the outer circumference while receiving the predetermined torque. Therefore, when pulling out the ink sheet 9 from the supply reel 26, a constant load is always applied, whereby back tension is applied to the ink sheet 9. Since the loose torque load of the spring spring 30b is stable in value, a stable back tension is applied to the ink sheet 9.

(Take-up reel and slip clutch) Next, the take-up reel 27 takes up the ink sheet 9 pulled out from the supply reel 26 at the time of recording. As shown in FIG. 4, this is the ink sheet 9 similar to the supply reel 26 described above.
Flanges 27b1 and 27b2 are provided on both ends of a reel shaft 27a having a length substantially the same as the width dimension of the bearing, a bearing 29b is loaded on one flange 27b1 side, and a rotational force transmission limiting means is provided on the other flange 27b2 side. A slip clutch 31, which is (torque transmitting means), is attached. The slip clutch 31 is for applying a constant rotational torque to the take-up reel 27. As shown in the exploded view of FIG. 6A and the sectional view of FIG. 6B, this slip clutch 31 has a D-cut fitting portion 31.
A spring 31b is attached to the shaft 31a having a1 so as to be tightened, and a hook 31b1 is formed on the spring 31b. And the shaft portion 31 to which the spring 31b is attached
The reel gear 33 is loosely fitted to the shaft a, and the shaft 31a is held by the collar.
Insert the E-rings 31d and 31e into the through-hole 31c1 of the 31c,
Attach it to the end of 31a to prevent it from coming off. At this time, the hook portion 31b1 of the spring spring 31b is attached so as to engage with the recess 33a formed in the reel gear 33. Furthermore, the tsuba
31c is fitted into the hollow reel shaft 27a, and the convex portion 31c2 protruding from the outer periphery of the flange 31c is fitted into and locked by the U-shaped groove 27c formed at the end of the reel shaft 27a.

In the above structure, the reel gear 33 is moved in the direction of the arrow d in FIG.
When 27 rotates in the direction in which the ink sheet 9 is wound up, the spring spring 31b tightening the shaft portion 31a receives a rotational force in the loosening direction, and the outer circumference of the shaft portion 31a and the spring spring 31b.
A frictional load is generated between the inner circumference of b and the inner circumference. Under the frictional load, the take-up reel 27 rotates in the direction of arrow d in FIG. 6A to wind up the ink sheet 9. When the spring 31b receives a predetermined torque or more, the spring 31b slides on the outer periphery of the shaft 31a while applying the predetermined torque. Therefore, the take-up reel 27 is always given a rotational force with a constant torque. The value of the loosening torque load of the spring spring 31b is stable as in the case of the slip clutch 30 of the supply reel 26.

In this embodiment, the supply reel 26 has a slip clutch 30 built-in, and the take-up reel 27 has a slip clutch 31.
By incorporating the above, a special space for providing the slip clutches 30 and 31 becomes unnecessary. Therefore, the gears and the like can be easily arranged in the design of the drive system, and the assemblability can be improved. Further, since the clutches 30 and 31 are exchanged together with the ink sheet cartridge E, the durability of one roll of ink sheet is sufficient.
Further, since the clutches 30 and 31 have a simple structure, they are advantageous in that they can be manufactured at a lower cost as compared with commercially available powder clutches.

Here, in the present embodiment, the take-up reel
When the ink sheet 9 is wound around 27, the end portion of the ink sheet 9 and the side of the base film 9b are attached to the outer peripheral surface of the reel shaft 27a of the take-up reel 27 by tape or the like, and the ink application surface side of the ink sheet 9 is wound. The take-up reel 27 is rotated so as to face the inside of the take-up roll.

(Capstan Roller) Next, the capstan roller 32 is an ink sheet conveying means for imparting a conveying force to the ink sheet 9, and in the present embodiment, as shown in FIG. It is stored.
This capstan roller 32 is a core made of a metal material.
A rubber portion 32c such as liquid silicone rubber is sprayed and coated on the outer peripheral surface of 32b so that the surface state is mirror finish and a gear 32d is fixed to the end of the core portion 32b.
The capstan roller 32 is mounted by inserting the bearing 32a into the U grooves 28g5 and 28g6 of the frame 28, and is mounted so as to be positioned on the base film 9b side of the ink sheet 9 housed in the frame 28. When the ink sheet cartridge E is loaded into the recording system B for recording, as shown in FIG. 1, in the recording conveyance direction of the ink sheet 9 (direction of arrow b in FIG. 1), the downstream side of the recording means 10 And take-up reel 27
The capstan roller 32 on the upstream side of the ink sheet 9
The base film layer 9b side is contacted.

At the time of recording, the ink sheet 9 is conveyed by the capstan roller 32 which rotates in the direction of the arrow in FIG. In the multi-print method in which recording is performed while the recording sheet 2 and the ink sheet 9 are conveyed in opposite directions as in this embodiment, a force of about 15 kg at maximum is required as the force for conveying the ink sheet 9. There is. Therefore, in this embodiment, when the friction coefficient between the capstan roller 32 and the base film 9b of the ink sheet 9 is set to be in the range of 10 to 20, slip between the both can be prevented. In this embodiment, the friction coefficient is set to about 14.

Further, as shown in FIG. 7, a capstan roller
The larger the wrapping angle θ of the ink sheet 9 with respect to 32 is, the larger the contact area between the capstan roller 32 and the ink sheet 9 is, so that the capstan roller 32 is less likely to slip. Therefore, in this embodiment, the ink sheet 9 is not wound around the take-up reel 27 (minimum take-up roll diameter).
The winding angle θ is set to about 30 °. As is clear from FIG. 1, the ink surface of the ink sheet 9 is wound inward and the capstan roller 32 is positioned so as to contact the base film surface side. When the diameter of the take-up roll is increased by being taken up by the take-up reel 27, the winding angle θ is also increased. Therefore, as the ink sheet 9 is taken up by the take-up reel 27, the capstan roller 32 surely applies the ink sheet conveying force. The winding angle θ
Is basically required to be in contact with the capstan roller 32, but considering the dimensional accuracy variation of the apparatus body 8 and the ink sheet cartridge E, it depends on the capstan roller diameter. It is recommended to set in the range of 5 ° ≦ θ ≦ 180 °. In this embodiment, the winding angle θ changes in the range of 30 ° to 90 ° depending on the change of the winding roll diameter.

As described above, the capstan roller 32 having a high friction coefficient is wound around the ink sheet 9 at a predetermined winding angle θ so that the conveyance force is applied to the ink sheet 9 only by the capstan roller 32. Since it can be performed by the above, the conventional pinch roller becomes unnecessary. It should be noted that in order to improve the conveyance accuracy of the ink sheet 9, it is better that the rubber portion 32c of the capstan roller 32 is less deformed. Therefore, in this embodiment, the rubber portion 32c is thin so that the thickness thereof is about 75 μm. As a result, the roller portion of the capstan roller 32 becomes difficult to deform, and the ink sheet 9
The transportation accuracy of is increased.

Further, in this embodiment, since the capstan roller 32 is provided in the ink sheet cartridge E,
When the cartridge E is replaced, the capstan roller 32 is also replaced. Therefore, since the durability of the capstan roller 32 is sufficient for one roll of the ink sheet, the capstan roller 32
Is easy to manufacture. When the capstan roller 32 is rotated at a constant speed, the carry amount of the ink sheet 9 depends on the roller diameter of the capstan roller 32. Therefore, particularly in the case of multi-printing, an ink sheet cartridge E containing a capstan roller 32 having a desired roller diameter is selected as the recording n value (the value of the conveyance amount of the ink sheet 9 with respect to the conveyance amount of the recording sheet 2). By doing so, it is possible to deal with it easily.

(Assembly of Ink Sheet Cartridge) Next, in order to assemble the ink sheet cartridge E, a bearing 29a is attached to one end of the supply reel shaft 26a around which the ink sheet 9 shown in FIG. Second housing 28b
The U-groove 28g1 formed on the
The shaft 30a, which has been taken on two sides, is fitted into the square groove 28g2. Further, a bearing 29b is attached to one end of the take-up reel shaft 27a,
29b is fitted into the U groove 28g3 of the second casing 28b, and a bearing (not shown) attached to the shaft portion 31a of the slip clutch 31 is attached to the U groove 28g3.
Fit in groove 28g4. And the bearing of the capstan roller 32
32a is fitted in the U grooves 28g5 and 28g6 formed in the second housing 28b. Next, the first casing 28a is opposed to the second casing 28b, and the welded portions 28a1 and 28b1 and the welded portions 28a4 and 28b6 are ultrasonically welded to each other, whereby the ink sheet 9 and the ink sheet with the capstan roller 32 are loaded. Assemble the cartridge E.

(Ink Cartridge Loading Method) In the above-described ink sheet cartridge E loading method, as shown in FIG. 1, first, the recording cover 15 in the recording system B is opened with the rotary shaft 14 as the center, and the cartridge base portion is opened. Guide pin 28f of the cartridge is inserted along a guide card rail (not shown) formed in the main assembly 8 of the apparatus, and the locking protrusion 28b4 at the tip of the cartridge is inserted.
Is locked in a U-shaped groove (not shown) formed in the apparatus main body 8 to be loaded in the recording system B.

[Recording Structure] Recording in the recording system B is carried out by mounting the ink sheet cartridge E as described above and performing thermal transfer recording by the recording means 10.

(Recording Means) Next, the recording means 10 is shown in FIG.
And FIG. 8 will be described. In the recording head 10a used in this embodiment, a plurality of heating elements 10a2, which generate heat when energized, are arranged in a line on a head substrate 10a1, and the heating elements 10a2 are selectively energized according to an image signal. Is a line-type thermal head in which a head driver element 10a3 for performing the above and a protective cover 10a4 surrounding and protecting the head driver element 10a3 over the entire width direction of the recording sheet 2 are attached.

Recording head 10a which is this thermal head
As shown in FIG. 8, when the distance from the heating element 10a2 to one end of the recording head 10a in the lateral direction is L1 and the distance to the other end is L2, It is arranged at a position where the relationship of distance is L1 <L2 (for example, L1 = 5 mm, L2 = 20 mm in this embodiment). The recording head 10a having the heating element 10a2 is
As shown in FIG. 1, the heat generating element 10a2 is swingably attached to a head supporting portion 10c provided on the recording cover 15 so as to be located on the upstream side in the conveying direction of the recording sheet 2, and as shown in FIG. Positioning pins 10 on both sides in the longitudinal direction of
a5 is provided. When the recording cover 15 is closed, the positioning pin 10a5 is inserted into the U-shaped groove 8d2 provided in the positioning member 8d that rotatably supports the shaft portion 10b1 of the platen roller 10b. It has a positioning function for setting the position of the recording head 10a. Further, the recording head 10a used in this embodiment reproduces an image as in the prior art by changing the arrangement of the heating head by reversing the arrangement order of the heating elements.

Next, a drive mechanism for adjusting the pressing force of the recording head 10a against the platen roller 10b will be described with reference to FIG. In the platen roller 10b, a roller portion 10b2 axially longer than the width dimension of the recording sheet 2 is formed on a shaft portion 10b1 rotatably attached to the apparatus body 8. One end of the shaft portion 10b1 is shown in FIG. The platen gear 48 is fixed as shown in FIG. In addition, the platen roller 10 of the recording head 10a
Push levers 34a, 34b, 34c are provided on the side opposite to b so as to be rotatable around a shaft 35 rotatably supported, and the push levers 34a, 34b, 34c are respectively springs 36a, 34a.
Rotational force is applied in the direction of arrow c in FIG. 9 by 36b and 36c. Further, the pressing levers 34a, 34b, 34c have groove portions 34a1,
34b1 and 34c1 are provided, and the groove portions 34a1, 34b1 and 34c1 have shafts 35
The pins 35a, 35b, 35c fixed to the above are contacted with a certain amount of play. An arm 37 is fixed to one end of the shaft 35.

Therefore, when the shaft 35 is in the position shown in FIG. 1 (that is, the positions in which the pins 35a, 35b and 35c are not in contact with the grooves 34a1, 34b1 and 34c1, respectively), the pressing levers 34a, 34b and 34 are provided.
c is rotated in the direction of arrow c in FIG. 9 by the force of the springs 36a, 36b, 36c, respectively, and comes into contact with the recording head 10a.
a is pressed against the platen roller 10b (hereinafter,
The positions of the pressing levers 34a, 34b, 34c at this time are called recording positions). On the other hand, when the shaft 35 rotates counterclockwise by a predetermined angle from the position shown in FIG. 1, the pins 35a, 35b, 35c and the groove 34a are formed.
Since it contacts with 1, 34b1, 34c1, pressing levers 34a, 34b, 3
4c overcomes the force of the springs 36a, 36b, 36c and rotates in the direction of arrow d in FIG. 9 to weaken (or eliminate) the pressure contact force of the recording head 10a to the platen roller 10b (hereinafter, at this time). The positions of the pressing levers 34a, 34b, 34c are referred to as standby positions). The waiting positions are pressing levers 34a, 34b, 34
It is desirable that the position c is not in contact with the recording head 10a. Further, in the present embodiment, the pressing levers 34a, 34
Since b and 34c are independently rotatable,
Press the lever by changing the spring force of the springs 36a, 36b, 36c.
It is possible to improve the print quality by making the pressure contact forces of the recording heads 10a of the recording heads 34a, 34b, 34c different in the width direction of the recording heads 10a.

(Drive transmission structure) Next, the recording sheet 2
A transport drive mechanism for the ink sheet 9 will be described with reference to FIG. In FIG. 9, a cassette motor 38, a platen motor 39, and an ink sheet motor 40 are attached to the apparatus body 8.

The cassette motor 38 rotates the paper feed roller 3, the feed roller 5a and the discharge roller 12a by rotating in one direction, and presses the platen roller 10b of the recording head 10a by the means described later by rotating in the other direction. To adjust. The motor gear 38a of the cassette motor 38 is meshed with the clutch gears 41a and 41b.
a and 41b are in contact with boss gears 43a and 43b via spring clutches 42a and 42b, respectively. The spring clutches 42a and 42b are one-way clutches formed by winding a wire rod. Boss gear 43a
Meshes with the roller gear 5c of the feed roller 5a, the roller gear 5c meshes with the intermediate gear 44, and the intermediate gear 44 meshes with the roller gear 3c of the paper feed roller 3. Also, the feed roller 5
The rotation of a is performed by the roller pulley 5d, the belt 45, and the roller pulley.
It is transmitted to the discharge roller 12a via 12c. On the other hand, the boss gear 43b meshes with the cam gear 46a of the cam 46. The cam 46 is in contact with the arm 37 and swings the arm 37 according to the rotational position. Here, the shape of the cam 46 is
When the minimum radius part 46b of the
34a, 34b, 34c are at the above-mentioned recording positions, and when the maximum radius portion 46c of the cam 46 is in contact with the arm 37, the pressing lever 34a
The a, 34b, and 34c are configured to be in the above-mentioned standby position. The rotational position of the cam 46 is detected by the cam sensor 47.

With the above construction, the cassette motor 38 is driven to rotate the motor gear 38a in the direction of the solid line arrow (hereinafter,
When the clutch gears 41a and 41b rotate, the spring clutch 42a locks and the spring clutch 42b idles in this rotation direction, so that the boss gear 43a rotates in the direction of the solid line arrow. On the other hand, the boss gear 43b is stopped. Therefore, the paper feed roller 3, the feed roller 5a, and the discharge roller 12a rotate in the direction of the solid line arrow to convey the recording sheet 2 in the direction of the arrow a. At this time, the cam 46 is stopped. On the other hand, when the cassette motor 38 is driven to rotate the motor gear 38a in the direction of the broken line arrow (hereinafter referred to as reverse rotation), the clutch gears 41a and 41b rotate, but in this rotation direction, the spring clutch 42a idles while the spring clutch Since 42b is configured to lock, the boss gear 43a stops, while the boss gear 43b rotates in the direction of the broken line arrow and the cam 46 rotates in the direction of the broken line arrow. Therefore, by reversing the cassette motor 38 by a predetermined step corresponding to the output of the cam sensor 47 (the position of the cam 46), the pressing levers 34a, 34 via the cam 46, the arm 37, and the shaft 35.
By moving b and 34c to the recording position or the standby position, the pressure contact force of the recording head 10a to the platen roller 10b is strengthened or weakened.

The platen motor 39 is a drive source for driving and rotating the platen roller 10b, and the motor gear 39a
And the platen gear 48 mesh with each other, and the motor 39 is driven to rotate the motor gear 39a in the direction of the solid line arrow, whereby the platen roller 10b is driven and rotated via the platen gear 48, and the recording sheet 2 is conveyed in the direction of the arrow a. To do.

On the other hand, when the ink sheet cartridge E is loaded and the recording cover 15 is closed, the gear 32d of the capstan roller 32 meshes with the motor gear 40a of the ink sheet motor 40, and the reel gear of the take-up reel 27 is connected to the gear 32d. 33
Mesh with each other. Therefore, when the ink sheet motor 40 is driven to rotate the motor gear 40a in the solid arrow direction, the gear 32d of the capstan roller 32 rotates in the solid arrow direction and the reel gear 33 of the take-up reel 27 moves in the solid arrow direction. Rotate. Therefore, the ink sheet 9 is pulled out from the supply reel 26 by the rotation of the capstan roller 32 and conveyed in the direction of the arrow b, and the conveyed ink sheet 9 is wound up by the take-up reel 27.

Further, the gear ratio is set so that the rotational peripheral speed of the take-up reel 27 is faster than the rotational peripheral speed of the capstan roller 32, and the take-up reel 27 has a slip clutch 31.
It is configured to rotate while causing slippage. The ink sheet 9 is taken up by the take-up reel 27 while the front tension is applied by the slip. Incidentally, by disposing the capstan roller 32, which gives a conveying force to the ink sheet 9, near the platen roller 10b, the elongation of the ink sheet 9 is reduced,
More accurate transportation can be performed.

(Rotation Detecting Section) FIG. 10A is a detailed view of the rotation detecting section F shown in FIG. 1, and FIG. 10B is a side sectional explanatory view thereof. The platen roller 10b is rotatably attached to the main body 8 via a bearing 70, and a washer 71, a spring 72, and a sensor arm 73 pass through the shaft portion 10b1, and a retaining ring 74 prevents the platen roller 10b from coming off. ing. A sensor 75 and a stopper 76 are provided on both sides of the sensor arm 73.

The sensor arm 73 has a pendulum shape and has a clutch portion 73 that contacts the spring 72 and the retaining ring 74.
a, a positioning portion 73b that abuts on the housing 75a of the photo sensor 75, and a shutter portion 73c that blocks between the light emitting portion 75b and the light receiving portion 75c of the photo sensor 75. The spring 72 is attached by being compressed so as to generate a predetermined spring force between the washer 71 and the sensor arm 73. Therefore, the sensor arm 73 is moved by the spring force of the spring 72.
10 (b) It is pressed to the left side and comes into contact with the retaining ring 74 to form a slip clutch. Therefore, the sensor arm
When 73 is located between the photo sensor 75 and the stopper 76, it rotates together with the platen roller 10b in the same direction.

In FIG. 10A, the platen roller 10b
When is rotated clockwise, the sensor arm 73
Rotate clockwise around b1 and use stopper 76
Stop at the position where it abuts against. When the platen roller 10b rotates counterclockwise, the sensor arm 73 also rotates counterclockwise and stops at the position where it abuts the photosensor 75.

The photo sensor 75 is a so-called photo interrupter type sensor, and receives the light emitted from the light emitting portion 75b by the light receiving portion 75c. The light emitting part
The photo sensor 75 sends an output L to the control unit 50 described later when there is a shield between the 75b and the light receiving unit 75c, and outputs H when there is no shield. For example, when the shutter portion 73c is in the position of FIG. 10A (position where the positioning portion 73b is in contact with the housing 75a), the shutter 73c blocks the optical axis between the light emitting portion 75b and the light receiving portion 75c.
The output of 75 is L, and when the sensor arm 73 rotates clockwise from this position, the shielding is released and the sensor output becomes H. That is, the photo sensor 75 detects the position of the sensor arm 73.

Next, the positional relationship between the positioning portion 73b and the shutter 73c with respect to the optical axis center of the photo sensor 75 will be described in detail. 11 (a) and 11 (b) are GG in FIG. 10 (b).
FIG. When the platen roller 10b is rotating in the counterclockwise direction shown in FIG. 1 (hereinafter referred to as "forward rotation"), the sensor arm 73 is in the position shown in FIG. 11 (a) (the positioning portion 73b contacts the housing 75a). Position). At this time, the shutter portion 73c is in a position to cover the optical axis of the photosensor 75 by a predetermined amount (n in the figure).
Therefore, at this time, the output of the photo sensor 75 is L.

On the other hand, when the platen roller 10b rotates clockwise from this position (hereinafter referred to as "reverse rotation"), the sensor arm 73 also rotates in the same direction. At this time, when the shutter portion 73c moves by a predetermined amount (approximately 2n),
The output of the photo sensor 75 becomes H when it reaches the position where the optical axis of the photo sensor 75 is not blocked as shown in (b). Further, the sensor arm 75 that has rotated a predetermined amount m in the same direction stops at the position where it abuts on the stopper 76.

When the platen roller 10b is further rotated counterclockwise, the shutter portion 73c is moved to the photo sensor.
When it reaches the position that blocks the optical axis of 75, the photo sensor 75
Output changes from H to L. That is, the photo sensor 75
It is possible to recognize that the platen roller 10b has reversely rotated by detecting that the output of the plate changes from L to H, and it is possible to recognize that the platen roller 10b has rotated normally by detecting that the output of H has changed from L to H. it can.

In this embodiment, it is preferable that the reverse rotation of the platen roller 10b is detected immediately and the normal rotation is detected with a delay of a predetermined time. Therefore, the movement amount m from the shutter portion 73c releasing the blocking of the optical axis to the contact with the stopper 76 is set to be relatively large. For example, m = 5
mm, n = 1 mm. Further, the radius r of the platen roller 10b is set to 8 mm and the turning radius R of the sensor arm 73 at the position blocking the optical axis is set to 40 mm. The above m = 5 mm, n
= 1 mm, r = 8 mm, R = 40 mm
The sensor arm 73 requires a movement amount of 2n around the optical axis center until the photo sensor 75 detects the reverse rotation of the platen roller 10b. The rotation angle θ of the sensor arm 73 at that time is θ = 2n / 2πR × 360 ° ≈2.86 °. The rotation of the sensor arm 73 at this time is due to the platen roller.
Since it rotates together with 10b, θ corresponds to the reverse rotation angle of the platen roller 10b. Therefore, at this time, the moving distance on the circumference of the platen roller 10b, that is, the conveyance amount P of the recording sheet 2 in the reverse direction is P = 2πr × θ / 360 = 0.
It becomes 40 mm. That is, recording sheet 2 is only 0.4
The output change of the photo sensor 75 (L
From (H), it is possible to detect the rotation failure of the platen roller 10b, that is, the conveyance failure of the recording sheet 2. Note that P =
2πr × θ / 360 = 2πr × 1/360 × 2n / 2π
R × 360 = rn / R, and if the radius of the platen roller 10b is constant, the optical axis shielding amount n of the shutter portion 73c is n.
If the rotation radius R of the sensor arm 73 is set to be small and the rotation radius R of the sensor arm 73 is set to be large, the time until the sensor 75 detects the reverse rotation of the platen roller 10b can be shortened, and the amount of backward movement of the recording sheet 2 can be suppressed to a small value during that time. Therefore, the damage to the device body is minimized. Meanwhile, platen roller 10b
In the detection of the normal rotation of θ, θ = m + 2n / 2πR × 360 = 10.03 ° P = 2πr × θ / 360 = 1.40 mm.

Further, although the clutch portion 73a constitutes a slip clutch, the necessary torque required for the sensor arm 73 to rotate around the shaft portion 10c is sufficient if there is a torque for rotating the sensor arm 73 by its own weight. The torque value of the slip clutch is about 100 gcm. The platen roller 10c is about 4000 gc for conveying the recording sheet 2.
The output / gear ratio of the platen motor 39 is set so as to generate a torque of m. Since the slip torque is sufficiently smaller than the torque generated in the platen roller 10b,
There is no adverse effect on the conveyance of the recording sheet 2.

As described above, in the present embodiment, the optical axis shielding amount n of the shutter portion 73c may be reduced in order to shorten the rotation failure detection time of the platen roller 10b, that is, the outer diameter of the shutter portion 73c. It is only necessary to improve the processing accuracy in a part. A large number of slit discs in the conventional rotation detection device do not require special processes such as precision processing of slits and positioning adjustment of the encoder, and a significant cost reduction can be realized.

(Description of Control System) Next, a control system for driving and controlling the respective members will be described with reference to the block diagram shown in FIG. In FIG. 12, reference numeral 50 denotes a control unit of the facsimile device, which is a power supply unit that supplies electric power to the entire device.
51, a modem board unit 52, an NCU board unit 54 for connecting the handset 23, and a display section 55 for displaying the contents input from the operation section D are arranged.

The control section 50 is used as a CPU 50a for controlling the entire recording apparatus, a ROM 50b storing various programs and various data, a work area for the CPU 50a, and a temporary storage of various data such as the number of recordings. It has a RAM 50c for saving. Reference numeral 50d is a line memory that stores an image of each line of the image data. When transmitting or copying a document, the image data for one line from the document reading system C is stored, and when receiving the image data. Stores the decoded data for one line. The various data stored in the line memory 50d is output to the recording system B to record an image. Reference numeral 50e is an encoding / decoding unit that encodes image information to be transmitted by MH encoding or the like, or decodes received encoded image data to convert it into image data. 50f is a buffer memory for storing transmitted and received encoded image data.

Next, the electrical system connection between the recording system B and the controller 50 will be described with reference to FIG. Recording head 10a
Is the serial recording data 56 for one line from the control unit 50.
shift register 57 for inputting a, latch signal 56b
A latch circuit 58 for latching the data of the shift register 57 by means of the heating element 10 composed of a heating resistor for one line
Equipped with a1. The heating element 10a1 is driven by being divided into m blocks (10a1-1 to 10a1-m). Further, the recording head 10a is equipped with a temperature sensor 59 for detecting the temperature, and an output signal 56c of the temperature sensor 59 is A / D converted in the control unit 50 to obtain the C signal.
It is input to the PU 50a. Thereby, the CPU 50a
Detects the temperature of the recording head 10a and changes the pulse width of the strobe signal 56d according to the temperature, or changes the driving voltage of the recording head 10a, etc.
The energy applied to the recording head 10a is changed according to the characteristics of The type (characteristic) of the ink sheet 9 is selected by inputting from the operation unit D or the like, but it is also possible to detect the mark or the like printed on the ink sheet 9 to determine the type or characteristic. . It is also possible to identify a mark, a notch, a protrusion, or the like attached to the cartridge that stores the ink sheet 9.

Reference numeral 60 denotes a recording head drive circuit which inputs a drive signal for the recording head 10a from the control unit 50 and outputs a strobe signal 56d for driving the recording head 10a in units of blocks. The recording head drive circuit 60 is the control unit.
The energy applied to the recording head 10a can be changed by changing the control time of the current output to the power supply line 56e for supplying the current to the heating element 10a1 of the recording head 10a according to the instruction of 50. Further, 61, 62, 63 are cassette motor 38, platen motor 39, which are the driving means.
It is a motor drive circuit that rotationally drives each ink sheet motor 40. Although the stepping motors are used as the motors 38, 39, 40, the motors 38, 39, 40 are not limited to these and may be DC motors, servo motors or the like. Further, the control unit 50 includes a recording sheet leading edge sensor 7 for detecting the leading edge of the recording sheet 2, a recording sheet ejection sensor 13 for detecting the passage of the recording sheet 2, a recording sheet presence sensor S1 for detecting the presence or absence of the recording sheet 2, A detection signal from an ink sheet presence sensor S2 that detects the presence or absence of the ink sheet 9 and an ink sheet speed sensor S3 that detects the conveyance speed of the ink sheet 9 and the like is input, and the display unit 55 is output according to the detection signal.
And a recording operation is controlled.

{Paper feeding operation} Next, prior to recording, the paper feeding system A
The operation of supplying the recording sheet 2 to the recording system B will be described with reference to the timing chart shown in FIG. In the following description, as for the rotation direction of each motor, as shown in FIG. 9, rotation in the direction of the solid arrow is forward rotation, and rotation in the direction of the broken arrow is reverse rotation.

(Operation 1) First, the cassette motor 38 is rotated in the reverse direction to move the pressing levers 34a, 34b, 34c to the standby position. As a result, the pressure contact force of the recording head 10a with respect to the platen roller 10b becomes small, so that the friction of the ink sheet 9 with respect to the recording head 10a and the platen roller 10b becomes small when the ink sheet 9 described later is conveyed, and the ink sheet 9
It is possible to prevent troubles such as wrinkles and ink peeling due to rubbing.

(Operation 2) When a recording signal arrives, first, before the start of recording, the ink sheet motor 40 rotates in the normal direction to rotate the capstan roller 32 in the normal direction to wind the ink sheet 9 by a predetermined amount. Then, back slip is applied to the ink sheet 9 by the action of the slip clutch 30 of the supply reel 26, wrinkles and slack of the ink sheet 9 are eliminated, and the quality of recording at the time of recording is improved. Further, the ink sheet 9 forms a flat surface between the capstan roller 32 and the recording head 10a, so that the platen roller 10b and the ink sheet 9 form a wedge-shaped space. Therefore, when the recording sheet 2 is supplied to the recording unit 10, the sheet 2 can smoothly enter without causing folds or wrinkles at the leading edge of the sheet 2.

(Operation 3) Next, the cassette motor 38 rotates in the normal direction to rotate the paper feed roller 3 and the feed roller 5a in the normal direction. As a result, the uppermost recording sheet 2 of the paper feeding cassette 1 is fed by the paper feeding roller 3 and the paper feeding piece 4, and is conveyed toward the recording means 10 by the feed roller pair 5a, 5b through the guides 6a, 6b. When the leading edge of the recording sheet 2 reaches the recording sheet leading edge sensor 7, the output of the leading edge sensor 7 is turned on. From this point the cassette motor
The driving step of 38 is counted by the control unit 50, and a predetermined step a (here, the leading edge of the recording sheet 2 is the leading edge sensor 7).
It is the number of steps required to reach the recording means 10 after passing through. By rotating, the leading end of the recording sheet 2 reaches the printing position while being guided by the ink sheet 9 as described above.

(Operation 4) After the lapse of the predetermined step a, the platen motor 39 is normally rotated to normally rotate the platen roller 10b. As a result, the recording sheet 2 can be easily inserted into the recording means 10, and the platen roller 10b and the recording head can be easily inserted.
The recording sheet 2 is sandwiched between the pressure contact portions with 10a, and thereafter the recording sheet 2 is conveyed by the platen roller 10b.
By rotating the platen motor 39 by a predetermined amount, the leading edge of the recording sheet 2 is conveyed to the downstream of the printing position of the recording unit 10 by the margin, and enters the recording standby state.

(Operation 5) Next, the cassette motor 38 is rotated in the reverse direction to move the pressing levers 34a, 34b, 34c to the recording position, and the recording becomes possible.

{Recording Operation} (Operation 6) When a recording signal arrives, the cassette motor 38, the platen motor 39, and the ink sheet motor 40 rotate normally, and the feed roller 5a, platen roller 10b, and capstan roller 32 rotate normally. . As a result, the recording sheet 2 is indicated by the arrow a.
In addition to being conveyed in the direction, the ink sheet 9 is conveyed in the direction of arrow b opposite to the conveying direction of the recording sheet 2, and recording on the recording sheet 2 is performed. When the multi-print method in which the recording sheet 2 and the ink sheet 9 are conveyed in the opposite directions for recording as described above is adopted, an image is formed while shearing the ink in the ink layer. Therefore, the conveyance of the ink sheet 9 requires a force obtained by adding the frictional force between the ink sheet 9 and the recording head 10a and the shearing force of the ink. Therefore, the carrying force for the ink sheet 9 needs to be larger than the carrying force when the conventional one-time ink sheet is used. Further, in the multi-print recording method, it is necessary to surely convey the ink sheet 9 by 1 / n line every time an image for one line is formed on the recording sheet 2 (record n value). It is possible to improve the quality of a recorded image by reliably carrying the sheet. In order to satisfy the above conditions, in this embodiment, the capstan roller 32 imparts a highly accurate and reliable conveyance force to the ink sheet 9.

(Operation 7) When the recording on the recording sheet 2 is completed, the cassette motor 38 rotates in the reverse direction and the pressing levers 34a, 34
Move b and 34c to the standby position. This weakens the pressure contact force of the recording head 10a against the platen roller 10b.

(Operation 8) Next, the cassette motor 38 and the platen motor 39 are rotated in the normal direction to rotate the platen roller 10b and the discharge roller 12a in the normal direction. As a result, the recording sheet 2 for which recording has been completed can be completely removed from the recording means 10.

(Operation 9) Further, the cassette motor 38 is normally rotated so that only the discharge roller 12a is normally rotated. This allows
The recording sheet 2 is discharged onto the lid 1d that functions as a tray on which the sheet 2 is placed. When the recording signal for the next page arrives, the same operation is repeated after the above operation 2. Further, the above operations 8 and 9 may be omitted between pages of continuous page recording.

In this embodiment, the platen roller 10b and the discharge roller 12a are driven by separate motors, and the recording sheet 2 on which recording has been completed is discharged by the discharge roller pair 12a,
Since it is not necessary to rotate the platen roller 10b excessively when discharging by the 12b, contact rotation between the platen roller 10b and the ink sheet 9 can be minimized,
It is possible to prevent wrinkles and ink peeling due to rubbing of the ink sheet 9, and it is possible to improve the quality. Also,
The discharge sensor 13 detects the rear end of the recording sheet 2 to confirm the normal discharging of the recording sheet 2.

Next, during the above-described recording operation, the platen roller
The operation when an abnormality occurs in the rotation of 10b will be described. For example, when a large amount of ink is melted and transferred onto the recording sheet 2 due to a malfunction of the recording head 10a, the shearing force in the ink layer becomes large and exceeds the conveying force of the recording sheet 2 by the platen roller 10b. In the present embodiment, the conveyance force of the ink sheet 9 is made sufficiently large, so that the recording sheet 2
Is not conveyed in the direction of arrow a while the shear in the ink layer is insufficient, and is conveyed in the direction of arrow b together with the ink sheet 9. Therefore, the platen motor 39 is out of step and the platen roller 10b is rotated in the reverse direction. If this state continues, the recording sheet 2 is replaced with the ink sheet cartridge E.
It will get inside and cut the ink sheet 9.

Further, the discharge guides 11a and 11b, the discharge roller pair
When the recording sheet 2 is jammed near 12a, 12b, or the platen motor 39 is disconnected, the motor drive circuit 62
Even when the sheet is damaged, the same state as described above, that is, the recording sheet 2 is not conveyed in the direction of the arrow a, and the platen motor
The step out of 39 causes the platen roller 10b to reversely rotate.

Next, the operation of the rotation detecting portion F when the above-mentioned abnormal rotation of the platen roller 10b occurs will be described with reference to the timing charts shown in FIGS.

(Operation 6) During the recording operation, the cassette motor 38, the platen motor 39, and the ink sheet motor 40 are normally rotated, and the recording head drive circuit 60 is driven to move the ink of the ink sheet 9 onto the recording sheet 2. To form an image. At this time, the recording sheet 2 is conveyed in the arrow a direction shown in FIG. 1, the ink sheet 9 is conveyed in the arrow b direction, and the platen roller 10b is normally rotated in the arrow direction. Further, the sensor arm 73 rotates along with the platen roller 10b, and at the position shown in FIG. 11A, the clutch arm 73a slips and is stopped. At this time, the output of the photo sensor 75 is L
Is.

(Operation 6 ') If there is a defect in the conveyance of the recording sheet 2, the platen roller 10 is operated as described above.
b reverses. When the platen roller 10b reverses a predetermined angle, the sensor arm 73 moves to the position shown in FIG. 11 (b), and the output of the photo sensor 75 becomes H. The control unit 50 detects the output change (L → H) of the photo sensor 75, recognizes that an abnormality has occurred, and performs the recovery operation shown in operations 11 to 15.

(Operation 11) First, the recording head drive circuit 60 is turned on.
The FF is performed to stop the heat generation of the recording head 10a to interrupt the recording and prevent the ink from being excessively melted. At the same time, the rotation of each motor is stopped for a predetermined time a. In the stepping motor, energization is continued in the same phase as the rotation is stopped and the position is maintained. The transport operation of the recording sheet 2 and the ink sheet 9 is stopped by stopping each motor. If the platen motor 39 is not stopped at this time, the recording sheet 2 is conveyed backward in the same direction as the ink sheet 9 as described above, and the platen motor 39 repeats normal and reverse rotations due to the step-out phenomenon. The ink sheet 9 is torn, and wrinkles or other damage occurs. When the forward / reverse rotation is further increased, the recording sheet 2 is rotated by the rotation of the platen roller 10b.
Cannot follow, and slip occurs on the contact surface between the platen roller 10b and the recording sheet 2. When an ink sheet peeling conveyance described later is performed in this state, the grip of the recording sheet 2 becomes unstable, and the recording sheet 2 is replaced by the ink sheet 9
The ink is not peeled off just by being taken back to and running backwards.

Therefore, by temporarily stopping the conveyance of the recording sheet 2 and the ink sheet 9, the grip between the platen roller 10b and the recording sheet 2 and between the ink sheet 9 and the capstan roller 32 are kept in a static friction state. Stabilize. Further, it is preferable that the pause time a is longer than the convergence time (centring time) of the damping vibration that occurs when each motor is stopped from the state of rotating at the predetermined frequency during recording. Further, in the present embodiment, each motor is a PM type stepping motor having a step angle of 7.5 ° and rotated at a 1-2 phase excitation of 400 pps, and the settling time is 20/1000 seconds to 50/1000 seconds. Therefore, the pause time a is preferably 50/1000 seconds or more. In the present embodiment, the pause time a = 500 in consideration of the convergence time of the rubber viscous deformation of the platen roller 10b.
/ 1000 seconds is set.

(Operation 12) Next, as described above, in order to peel off the ink sheet 9 attached to the recording sheet 2, the ink sheet motor 40 is rotated forward by a predetermined amount and the ink sheet 9 is rotated.
Wind up. Here, the ink sheet peeling / conveying amount b needs to be such that the shearing and peeling of the ink is surely performed, and at the time of recording on the next line, an unrecorded new ink portion reaches the recording position. In the recording head 10a of the present embodiment, the length of the heating element 10a2 in the recording sheet conveyance direction is about 60 mm, so the length of the ink sheet 9 melt-transferred and stuck onto the recording sheet 2 is also about 50 μm to 100 μm. is there.
Therefore, it is preferable that the ink sheet peeling conveyance amount b is about 100 μm or more, and in this embodiment, the ink sheet motor 40 is normally rotated by the number of steps corresponding to winding the ink sheet 9 of b = 1 mm.

(Operation 13) Thereafter, a predetermined time c (preferably 1 to 100/1000 seconds, 20/1000 in this embodiment).
Seconds), cassette motor 38, platen motor 39
Is rotated by a predetermined amount and the recording sheet 2 is conveyed by a predetermined recovery conveyance amount d.

(Operation 14) Here, as described above, when the conveyance failure of the recording sheet 2 occurs, the output of the photosensor 75 changes after the platen roller 10b starts to rotate in the reverse direction (control unit 50).
Detects the reverse rotation), the recording sheet 2 has P = rn /
Only R is returned in the opposite direction. Therefore, when the above-described recovery conveyance amount d is small, it is preferable that it is almost equal to P in order to improve the connection of images. Also P
Is large, the amount of the recording sheet 2 to which the ink is transferred passes through the recording unit 10 again, and the conveyance load of the recording sheet 2 also becomes large. Therefore, when the rotational conveyance amount d is set to be larger than P and the recording sheet 2 is excessively conveyed and recording is started again, it is desirable that the new recording sheet 2 which has not been transferred is at the recording position of the recording unit 10.

Therefore, the recovery conveyance amount d may be set to an arbitrary value so as to improve the connection of images in the conveyance defect occurrence portion and not to increase the conveyance load of the recording sheet 2. In the present embodiment, since P = 0.40 mm, extra conveyance of 0.010 mm to 0.60 mm is added to set d = 0.50 to 1.00 mm.

(Operation 15, Operation 6 ″) When the recording sheet 2 and the ink sheet 9 can be separated by the above-described ink sheet peeling conveyance (Operation 12), the platen is conveyed by the recovery conveyance of the recording sheet 2 (Operation 14). Since the roller 10b normally rotates in the normal direction, the output of the photo sensor 75 changes from H to L by the rotation of the sensor arm 73. If the separation is impossible, the platen is recovered even if the recovery conveyance is performed by d. Since the roller 10b cannot rotate in the normal direction, the output of the photo sensor 75 remains H. Therefore, the control unit 50 checks the output of the photo sensor 75 after carrying out the recovery conveyance by d. When it is recognized that the conveyance failure can be recovered, after a predetermined time e has elapsed (operation 15), the recovery operation is ended and recording is restarted (operation 6 ″). On the other hand, if the output is H, the process returns to the beginning of operation 11 and the recovery operation is repeated again.

The recovery carry amount d may not be set to a fixed value, and the predetermined amount d1 may be carried after the output of the photosensor 75 changes to L. Further, the control unit 50 counts the number of times the above-mentioned recovery operation is repeated, and a predetermined number of times (x
If the output of the photo sensor 75 is L in the operation 14, even if the recovery operation is performed once, x is a natural number, it is considered that the conveyance failure cannot be recovered, and the recording operation is interrupted to stop the apparatus. Damage can be prevented. In this embodiment, x = 10 times is set in consideration of the strength of the ink sheet 9 and the recording time. Furthermore, the recording interruption is displayed on the display unit 55,
It is preferable to display a message prompting the user to clear the jam.

[Second Embodiment] Next, a second embodiment of the rotation detecting portion F shown in the first embodiment will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 16, the sensor arm 73 is shaped like a disc having a cutout 73d, and a stopper 76 in both directions is provided on the sensor arm 73. The sensor arm 73 and the shaft portion 10b1 are connected by a torque limiter 80 such as a powder clutch. The rotation of the platen roller 10b is transmitted to the sensor arm 73 via the torque limiter 80, and slips when the torque limiter 80 receives a certain torque (when the stopper 76 contacts the photo sensor 75).

According to the above configuration, since the sensor arm 73 has a disc shape, the center of gravity is substantially coincident with the center of the shaft portion 10b1, so that the sensor arm 73 is rotated and the platen roller is rotated.
10b Rotation is stable. Further, the torque limiter 80 has excellent torque stability and durability, and the quality is improved.

Third Embodiment Next, a third embodiment of the rotation detector F shown in the first embodiment will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 17, the sensor arm 73 has a cam shape and is rotatably attached about the shaft portion 10b1. Further, the boss portion 73e and the shaft portion 10b2 are spring clutches.
81 is wrapped around. The spring clutch 81 is formed by winding a wire material for spring in a coil shape, and is a platen roller.
At the time of reverse rotation of 10b, the winding is tightened due to the contact friction with the shaft portion 10b2, and the shaft portion 10b2 and the boss portion 73e integrally rotate in the same direction. When loosened, the shaft portion 10b2 rotates separately from the boss portion 73e.

Further, the hook 73f of the sensor arm 73 has
A tension spring 82 is provided to apply a force to rotate the sensor arm 73 counterclockwise in the figure. Further, in this embodiment, a micro switch 83 is used instead of the photo sensor 75.
Is used. When the protrusion 73g of the sensor arm 73 pushes down the lever 83a of the micro switch 83, the switch 83 is turned on. When the protrusion 73g and the lever 83a are in the solid line position in the figure, the switch 83 is OFF, and when the protrusion is in the position indicated by the two-dot chain line, the switch 83 is ON. The micro switch 83 detects the position of the sensor arm 73 (that is, the rotation state of the platen roller 10b) by sending an ON / OFF signal to the control unit 50.

In the above structure, when the platen roller 10b rotates in the forward direction, the spring clutch 81 is in the loosening direction,
The sensor arm 73 is not coupled to the shaft portion 10b1 but rotates by the force of the tension spring 82 and stops at the position where it abuts on the stopper 76. At this time, the output of the micro switch 83 is O
It is FF. When the platen roller 10b is rotated in the reverse direction, the spring clutch 81 is in the closing direction, so that the sensor arm 73
Rotates together with the shaft portion 10b1, and when it reaches the position indicated by the chain double-dashed line in the figure, the output of the microswitch 83 is turned on.

Further, in the above structure, since the spring clutch 81 is used instead of the slip clutch, the platen roller 10
During normal rotation of b (during recording), since the spring clutch 81 is loosened, the slip torque does not continue to be applied unlike the slip clutch. Therefore, the rotation of the platen roller 10b is stable and the quality of the recorded image can be kept high. Further sensor arm
Photo sensor 75 that optically detects the position of 73 without contact
Instead, since the micro switch 83 that mechanically contacts the position of the sensor arm 73 to electrically detect it is provided, the probability of malfunction is low and the reliability of the device is improved.

The rotation detector F described above is a platen roller.
Although the example provided in 10b is shown, it is not limited to this, and it may be provided in any rotating body.
For example, by providing the capstan roller 32, the rotation state of the capstan roller 32, that is, the conveyance state of the ink sheet 9 can be detected. In addition, each motor 38, 39,
It may be provided at 40, and in that case, the rotation speed is higher than that of the platen roller 10b, so that the rotation detection response becomes faster. Further, by providing the transport rollers 19a and 19b, the transport state of the document 16 can be detected. Furthermore, the gears of the drive system,
It is also possible to provide the ink sheet 9 on the take-up reel 27, the supply reel 26, or the like.

Further, by using the rotation detecting section F shown in each of the above-described embodiments, the time until the sticking between the ink sheet 9 and the recording sheet 2 in the recording apparatus can be detected, but the rotation detection is possible. Even if a general encoder is used for the section F, if the ink sheet 9 and the recording sheet 2 are conveyed by the operation shown in each of the embodiments, the sticking can be recovered in almost the same manner.

[Other Embodiments] Next, other embodiments of the respective parts in the ink sheet cartridge and the recording apparatus described above will be described. In the above-described embodiment, the multi-print system in which the recording sheet 2 and the ink sheet 9 are conveyed in opposite directions for recording has been illustrated. However, a one-time ink sheet is used and the recording sheet and the ink sheet are conveyed in the same direction. Naturally, it is possible even with the one-time printing method in which recording is performed by recording.

Further, the present invention is not limited to the thermal transfer recording type recording apparatus using the ink sheet 9, but other apparatus such as a thermal recording method for recording using a thermal roll paper, a laser beam recording method, an ink jet. The present invention can also be applied to a recording device that adopts a recording method or the like. This is because, regardless of the recording method, when an abnormality occurs in the sheet material conveyance state, the rotating body such as the roller and the motor always fails to rotate.

Further, in the above-mentioned embodiment, the capstan roller 32 is formed by blowing silicone rubber to form the roller portion. However, it is not necessary to limit to the silicone rubber. That is, any material can be used as long as the coefficient of friction of the ink sheet 9 can be obtained, and other materials such as chloroprene rubber can be used. Also, as a method of attaching the material to the core portion, one thin plate member may be wound around the core portion and attached. Alternatively, a pipe-shaped member may be made of the above material, and the core may be inserted into the pipe to be attached. Alternatively, the rubber portion may be formed by molding. In this case, since the friction coefficient is lower than that of the spraying process (about 1.5 to 6), it is necessary to increase the wrapping angle θ and the back tension to prevent the capstan roller 32 and the ink sheet 9 from slipping. is there. As experimental data, the friction coefficient is 2.6
At that time, there was no defective conveyance of the ink sheet 9 at a wrapping angle of 45 ° and a back tension of 400 g or more. Also, the thin plate described above,
In the case of manufacturing pipes, molding, etc., the friction coefficient between the capstan roller 32 and the ink sheet 9 used in the first embodiment described above can be approximated by mirror-finishing the rubber outer peripheral surface.

Further, in the above-mentioned embodiment, the capstan roller 32 is built in the ink sheet cartridge E, but the roller 32 is not necessarily the cartridge E as a recording apparatus.
It does not need to be built in, and may be attached to the apparatus main body side. Further, in the above-described embodiment, the capstan roller 32 is configured as the transporting means for the ink sheet 9, but it may be configured as other transporting means for the ink sheet 9 such as using a transport roller and a pinch roller. Is.

Further, in the above-mentioned embodiment, the recording head 10a
Although the conventional image was obtained by reversing the arrangement order of the heating elements 10a2 of No. 1, the same effect as the present invention can be obtained by reversing the data permutation of the serial recording data 56a of the control unit 50. Is obtained.

[0120]

As described above, the rotating arm rotates following the rotating direction of the rotating body, and the position of the rotating arm is detected by the detecting means to detect the rotating direction of the rotating body. be able to. Further, the time from the occurrence of the rotation failure of the rotating body to the detection thereof is short, and the trouble of the apparatus body can be minimized. Further, since the control is easy and the signal is generated only when the rotation failure occurs, complicated control is not required and the speedup of the apparatus main body can be realized. Furthermore, the configuration is simple as a whole, and cost reduction can be realized.

Further, in the recording apparatus, it is possible to immediately detect the sticking phenomenon between the recording material and the ink sheet and separate them. Further, since it is possible to recover from the sticking phenomenon and continue recording before the ink sheet runs out or the recording material is jammed, it is possible to remarkably improve the reliability and safety of the apparatus.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the overall structure of a facsimile device.

FIG. 2 is an external perspective view of a facsimile device.

FIG. 3 is a cross-sectional explanatory diagram of an ink sheet.

FIG. 4 is a development explanatory diagram of an ink sheet cartridge.

FIG. 5 is a structural explanatory view of a slip clutch on the supply reel side.

FIG. 6 is a structural explanatory view of a slip clutch on the take-up reel side.

FIG. 7 is an explanatory diagram of an ink sheet conveyance path.

FIG. 8 is an explanatory diagram of a configuration of a thermal head.

FIG. 9 is an explanatory diagram of a drive transmission configuration.

FIG. 10 is a detailed explanatory diagram of a rotation detection unit.

FIG. 11 is a detailed explanatory diagram of a rotation detection unit.

FIG. 12 is a block diagram of a control system.

FIG. 13 is an explanatory diagram showing an electrical connection between a control system and a recording system.

FIG. 14 is a time chart showing a recording operation.

FIG. 15 is a time chart showing the operation of the rotation detection unit.

FIG. 16 is a detailed explanatory diagram of a rotation detection unit according to the second embodiment.

FIG. 17 is a detailed explanatory diagram of a rotation detection unit according to the third embodiment.

FIG. 18 is an explanatory diagram of a conventional rotation detection device.

FIG. 19 is an explanatory diagram of a conventional recording device.

[Explanation of symbols]

A ... Paper feeding system B ... Recording system C ... Reading system D ... Operation part E ... Ink sheet cartridge F ... Rotation detecting part 1 ... Cassette 2 ... Recording sheet 3 ... Paper feeding roller 3a ... Arc part 3b ... Flat part 4 ... Feed Paper piece 4a ... Sheet portion 4b ... Arm portion 5a, 5b ... Feed roller 5c ... Roller gear 5d ... Roller pulley 6a, 6b ... Guide 7 ... Recording sheet tip sensor 8 ... Device body 9 ... Ink sheet 9a ... Heat resistant coat layer 9b ... Base film layer 9c ... Ink layer 9d ... Top coating layer 10 ... Recording means 10a ... Recording head 10a1 ... Head substrate 10a2 ... Heating element 10a3 ... Head driver element 10a4 ... Protective cover 10b ... Platen rollers 10b1, 10b2, 31a ... Shaft part 10c ... Head support Parts 11a, 11b ... Ejection guides 12a, 12b ... Ejection roller 13 ... Ejection sensor 14 ... Rotating shaft 15 ... Recording cover 15a ... Original document table 16 Document 17a ... Preliminary transport roller 17b ... Pressing piece 18a ... Separation roller 18b ... Pressing piece 19a, 19b ... Transport roller 20a, 20b ... Ejection roller 21 ... Ejection tray 22 ... Photoelectric conversion element 23 ... Handset 24a, 24b ... Electrical board 25 ... Push-up plate 26 ... Supply reel 26a ... Reel shaft 26b1, 26b2 ... Flange 26c ... U-shaped groove 27 ... Take-up reel 27a ... Reel shaft 27b1, 27b2 ... Flange 27c ... U-shaped groove 28 ... Frame 28a ... First housing 27a1 , 27a4, 28b1, 28b6, 28c1, 28c2 ... Welded portion 27a2, 28b2 ... Side plate 27a3 ... Fitting hole 28b ... Second housing 28b2 ... Side plate 28b3 ... Fitting projection 28b4 ... Locking projection 28d, 28e ... Window 28f ... Guide pin 29g1 , 28g3, 28g4, 28g5, 28g6 ... U groove 29g2 ... Square groove 28h ... Opening 29a, 29b, 32
a, 70 ... Bearing 30, 31 ... Slip clutch 30a, 35 ... Shaft 30b, 31b ... Spring spring 30b1, 31b1 ... Hook portion 30c, 31c ... Tsuba 30c1, 31c1 ... Through hole 30c2, 33a ... Recessed portion 30c3, 31c2 ... Convex portion 30d, 31d, 31e ... E-ring 31a1 ... D-cut fitting part 32 ... Capstan roller 32b ... Core part 32c ... Rubber part 32d ... Gear 33 ... Reel gear 34a, 34b, 34
c ... Pressing lever 34a1, 34b1, 34c1 ... Groove portion 35a, 35b, 35
c ... Pins 36a, 36b, 36c ... Spring 37 ... Arm 38 ... Cassette motor 38a, 39a, 40
a ... Motor gear 39 ... Platen motor 40 ... Ink sheet motor 41a, 41b ... Clutch gear 42a, 42b, 81
… Spring clutches 43a, 43b… Boss gear 44… Intermediate gear 45… Belt 46… Cam 46a… Cam gear 46b… Radius minimum part 46c… Radius maximum part 47… Cam sensor 48… Platen gear 50… Control part 50a… CPU 50b… ROM 50c… RAM 50d ... Line memory 50e ... Encoding / decoding section 50f ... Buffer memory 51 ... Power supply section 52 ... Modem board unit 54 ... NCU board unit 55 ... Display section 56a ... Serial recording data 56b ... Latch signal 56c ... Output signal 56d ... Strobe signal 56e ... Power line 57 ... Shift register 58 ... Latch circuit 59 ... Temperature sensor 60 ... Recording head drive circuit 61, 62, 63 ... Motor drive circuit 71 ... Washer 72 ... Spring 73 ... Sensor arm 73a ... Clutch section 73b ... Positioning Part 73c ... Shutter part 73d ... Notch 73e ... Boss part 73f ... Hook 73g ... Protrusion 74 ... Retaining ring 75 ... Photo sensor 75a ... Ujingu 75b ... light-emitting unit 75c ... receiving portion 76 ... stopper 80 ... torque limiter 82 ... tension spring 83 ... microswitch 83a ... lever

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumihiko Nakamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (2)

[Claims] 1. A rotating body, and a rotating member capable of rotating a predetermined amount in the reverse direction following the rotation of the rotating body when the rotating body starts to rotate from a forward rotation direction to a reverse rotation direction. A rotation detecting device comprising: a detecting unit configured to detect a rotating position of the rotating member. 2. A recording apparatus for transferring the ink contained in an ink sheet to a recording material for recording, and a recording material conveying means for conveying the recording material, and an ink for conveying the ink sheet. The rotation detecting device according to claim 1, wherein the rotation detecting device is provided in at least one of a sheet conveying unit, a recording unit that acts on the ink sheet to record an image on the recording medium, and at least one of the recording medium conveying unit and the ink sheet conveying unit. A recording apparatus, comprising: an apparatus; and a control unit that controls the drive of each of the recording material conveyance unit and the ink sheet conveyance unit according to an output signal of the rotation detection device.