JPS63276577A - Image recorder - Google Patents

Abstract

PURPOSE:To prevent useless consumption of an ink sheet, by a method wherein only rotation in a specific direction of a platen roller is transmitted to a winding means, rotation in the reverse direction transmitted to an ink sheet holding means, and an ink sheet is wound back even before a recording paper is pulled back by the reverse rotation of the platen roller. CONSTITUTION:Counterclockwise rotation of a friction gear 86 is transmitted to a friction pulley accompanying reverse rotation of a platen roller 72, and transmitted to one-way mechanisms 93, 94 via a timing belt 103. Then, it is transmitted to a winding back gear 65 of an ink sheet cassette 16 by actuation of the one-way mechanism 94, and a spool 52a is counterclockwise rotated. Therefore, an ink sheet 52 is wound back by a quantity corresponding to a pulling back quantity of a recording paper 54 owing to the platen roller 72. Since the one-way mechanism 93 slips, a spool 53 is besides, suitable tension is given the ink sheet 52 to prevent loosening and ruck from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ink sheet cassette, and more particularly to an image recording device that can be equipped with an ink cassette containing ink sheets, recording paper, etc., and that records images by thermal transfer. Regarding.

(Prior Art) Recently, mechanisms,
Many image recording devices using thermal heads have been commercialized because of their extremely simple structure and low cost.

An example of such an image recording apparatus is the one shown in FIG. In FIG. 7, 1 is an image recording device, and the image recording device 1 includes an ink sheet 2, a recording paper 3, a guide roller 4, a peeling roller 5, a spool 6, a thermal head 7, a platen roller 8, and a cutter unit. It has 9. The ink sheet 2 used is, for example, a base sheet made of several liters of polyester and coated with a thermal transfer ink layer.
wrapped around. The ink sheet 2 is attached to a holding member (not shown), and is attached to a guide roller 4 and a peeling roller 5.
is wound onto the spool 6 via the spool 6. The holding member for the ink sheet 2 is provided with a back tension mechanism, which applies a predetermined tension to the ink sheet 2 when it is fed out to prevent wrinkles from forming on the ink sheet 2.

The spool 6 is connected to a winding mechanism (not shown), and winds up the ink sheet 2 after recording in conjunction with the rotation of the platen roller 8. The winding mechanism is provided with a one-way clutch mechanism, which winds up the ink sheet 2 when the platen roller 8 rotates in the direction of conveying the recording paper 3.
When the facsimile platen roller 8 rotates in a direction to return the recording paper 3 to the thermal head 7 side, winding of the ink sheet 2 is stopped. A roll of plain paper is used as the recording paper 3, and its axis 3a is rotatably supported by a holding member (not shown). The recording paper 3 is supplied together with the ink sheet 2 via a guide roller 4 between a thermal head 7 and a platen roller 8. The thermal head 7 is provided with a plurality of heating elements (not shown), and the heating elements selectively heat the ink layer applied to the ink sheet 2 based on image information from a control section (not shown). Recording is performed by melting each line and transferring it to the recording paper 3. The ink sheet 2 and recording paper 3 that have been recorded are removed by a peeling roller 5.
The ink sheet 2 is taken up on a spool 6, and the recording paper 3 is fed to a cutter unit 9. After recording is completed, the recording paper 3 is cut into a predetermined size by a cutter unit 9 and discharged. Further, the remaining amount of the ink sheet 2 and the recording paper 3 is detected by a sensor (not shown) at an end mark provided at the end of each.

Note that in FIG. 7, numbers are not added to the paper guides.

Here, when the image recording apparatus 1 finishes recording and the recording paper 3 is cut by the canter unit 9, the platen roller is reversely rotated to return the recording paper 3 to the thermal head 7 side, and the leading edge of the recording paper 3 (cut position) to the recording start position (tip margin) is small (for example, about 21).
The operation is performed to avoid wasting the recording paper 3.

(Problems to be Solved by the Invention) However, in such a conventional image recording apparatus, the ink sheet 2 is wound up according to the amount of conveyance of the recording paper 3 by the platen roller 8. Further, winding is also performed when the recording paper 54 is conveyed to a predetermined cutting position after recording is completed, but when the recording paper 3 is completely cut, the thermal head 7 is rotated by the reverse rotation of the planer 7jl--772. In contrast, when the platen roller 8 rotates in the opposite direction, the ink sheet 2 winding device only stops winding and does not rewind. Therefore, there is a problem in that the ink sheet 2 corresponding to the recording paper 54 conveyed to a predetermined cutting position after the recording is completed is wasted and is uneconomical.

(Object of the Invention) Accordingly, the present invention provides a first transmission means for transmitting only the rotation of the platen roller in a predetermined direction to the winding means;
By providing a second transmission means that transmits only the rotation of the platen roller in the opposite direction to the predetermined direction to the ink sheet support means of the ink sheet cassette, when the recording paper is pulled back by the rotation of the platen roller in the opposite direction, The purpose of this method is to rewind the ink sheet to eliminate ink sheet waste and reduce costs.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides that a roll of recording paper, an ink sheet, and the ink sheet cassette are conveyed in a predetermined direction as a platen roller of a recording device rotates. a roll-shaped recording paper that overlaps the recording paper in at least a predetermined recording device and is conveyed as the recording paper is conveyed; and an ink sheet support means that rotatably supports the ink sheet. , a winding means for winding up a used ink sheet to which the tip of the ink sheet is fixed, and a recording device to which an ink sheet cassette housed in a case can be attached, and has a one-way clutch, a first transmission means for transmitting only rotation of the platen roller in a predetermined direction to the winding means; and a one-way clutch;
The apparatus is characterized by comprising a second transmission means for transmitting only the rotation of the platen roller in a direction opposite to the predetermined direction to the ink sheet support means.

Hereinafter, the present invention will be specifically explained based on examples.

1 to 6 are diagrams showing an embodiment of the present invention, which is applied to a facsimile machine.

In FIG. 1, 11 is a facsimile machine, and the facsimile machine 11 has a main body 11a with a document table 12,
The main body 11b includes an operation section 13, a document reading section 14, etc., and a control section 15, an ink sheet cassette 16, and a recording section 17.
etc. The original table 12 contains the original 18 to be sent.
It is a stand where you can collect multiple manuscripts per day and earn cents. The operation unit 13 includes, for example, a start key, a numeric key,
It is equipped with various control switches, a display section, etc., and outputs command signals for controlling each section of the facsimile machine 11 to the control section 15.

The document reading section 14 includes an ADF roller 21, a separating rubber 22, feed rollers 23, 24, 25, 26, and a reading means 2.
It has 7. The ADF roller 21 is a roller for automatic paper feeding, and is rotated by power from a drive source (not shown).
The feed roller 23 feeds the original 18 set on the
．． 24, 25, 26 side. Feed roller 23
．． 24, 25, and 26 each rotate at the same feed rate, and AD
The document 18 fed from the F roller 21 is transported (sub-scanning) at a predetermined speed. The reading means 27 includes a light source 2B and a mirror 29.
．． 30, 31 and a line image sensor 32. For example, a fluorescent lamp is used as the light source 28, and irradiates light across the width direction of the document 18. The irradiated light is reflected by the surface of the original 18 and introduced into the line image sensor 32 by mirrors 29, 30, and 31. The line image sensor 32 is a CCD (Charge Couple).
Photoelectric devices such as ed devices are used.
The image of the document 18 conveyed by the feed rollers 23 , 24 , 25 , 26 is read line by line from the beginning, photoelectrically converted, and output to the control section 15 . The document 18 whose image has been read by the reading means 27 is discharged from the paper discharge port 33 by the feed rollers 25 and 26.
The paper is stored in a paper output tray (not shown). Note that in FIG. 1, the numbering of the paper guide provided in the document reading section 14 is omitted. On the other hand, the paper discharge port 33 of the main body 11a
A support member 34 is provided nearby, and the support member 34
It is assumed that the main body 11a including the operation section 13 can be opened and closed. This facilitates maintenance of the document reading section 14. Further, a support member 35 is provided at the lower right side of the main body 11a in FIG. 1, and the main body 11a is rotatably held by the support member 35 on the main body 11b.

As shown in FIG. 2, the control unit 15 includes a network control circuit 41,
It includes a modulation/demodulation circuit 42, a data compression/reproduction circuit 43, a buffer memory 4, an A/D conversion circuit 45, and a control circuit 46. The network control circuit 41 is generally referred to as an AA-NCU, and automatically originates a call to a destination and automatically receives a call in response to a transmission from an external line. The modulation/demodulation circuit 42 is generally referred to as a modem, and modulates the image information of the document 18, which is processed in the control unit 15 and converted into a digital signal, for transmission through an external line, and modulates the image information input from the external line. Demodulate the signal and extract the digital signal. The data compression/reproduction circuit 43 aims to shorten the transmission time and improve the efficiency of image information, and compresses (encodes) the image information during transmission, and reproduces the compressed image information into original information during reception. The buffer memory 44 is A
/D conversion circuit 45 converts the document into a binary image
The image information from the original information is stored for each predetermined line (for example, one line) and sent to the data compression/reproduction circuit 43, and the image information reproduced from the original information by the data compression/reproduction circuit 43 is stored for each predetermined line. It is output to the recording section 17. A/
The D (Analog/Digital) conversion circuit 45 converts an analog signal into a digital signal, and converts image information (analog signal) for each read line inputted from the document reading section 14 into image information that can be processed by the control section 15. (digital signal). The control circuit 46 is, for example, a CP
It is equipped with U, ROM, RAM, etc., and receives command signals from the operation unit 13, signals from the termination detection sensor 76 described later and sensors (not shown) provided in each part, or image information transmitted from an external line. The facsimile machine 11 is integrally controlled based on this information.

Returning to FIG. 1, the ink sheet cassette 16 includes an ink sheet 52, a spool 53, a recording paper 54, and guide rollers 55 and 56 inside a cassette case 51.

The cassette case 51 is made of resin such as ABS, and the ink sheet 52, recording paper 54, and guide roller 55 are contained inside the cassette case 51.
A storage portion 57 that stores the spool 53 and the guide roller 56 substantially in the same manner, and a storage portion 58 that stores the spool 53 and the guide roller 56 are formed. These storage portions 57 and 58 have shapes that prevent the members stored therein from being touched.

Therefore, each member stored in the storage section 57 and the storage section 58 is protected without being affected by each part. Also,
The storage section 57 and the storage section 58 are arranged at a predetermined interval, and this interval is determined by the thermal head 7 of the recording section 17, which will be described later.
1 and the blank roller 72 are set to dimensions that allow them to enter into the cassette case 51. An opening 59 is formed in the upper surface of the cassette case 51 , and the opening 59 is provided between the storage section 57 and the storage section 58 to prevent the thermal head 71 from entering the inside of the cassette case 51 . Possible size. On the other hand, an opening 60 is formed in the bottom of the cassette case 51, and the opening 60 is provided at a position substantially opposite to the opening 59, so that the platen roller 72 cannot enter into the inside of the cassette case 51. Possible size. Correspondingly, as shown in FIG.
, 61b are formed to avoid interference between the cassette case 51 and the platen roller 72. Further, pin receivers 63 (only one is shown due to the structure of the drawing) are formed on both side surfaces of the cassette case 51.
3 positions the entire ink sheet cassette 16 by engaging with a not-shown bin provided in the recording section 17 when the ink sheet cassette 16 is installed in the recording section 17.

Returning to FIG. 1, an opening 62 is formed on the bottom of the cassette case 51 in the vicinity of the aperture 60, and the opening 52 is provided corresponding to the location of an end detection sensor 76, which will be described later. It will be done. Therefore, the end detection sensor 76 can detect the end mark provided at the end of the recording paper 54 through the opening 62.

The ink sheet 52 used is, for example, a polyester base sheet coated with a thermal transfer ink layer. It's wrapped. Here, the total length of the ink sheet 52 is set longer than the recording paper 54.

Further, the tip of the ink sheet 52 is fixed to a spool (ink sheet spool) 53, and the ink sheet 52 is fixed to a spool (ink sheet spool) 53.
2 is wound onto a spool 53 via guide rollers 55,56. The recording paper 54 is a roll of plain paper, and a predetermined end mark is provided at the rear end of the recording paper 54 in the winding direction. The end mark is provided at a position facing an opening 62 (for end detection sensor) formed in the bottom of the cassette case 51 when the recording paper 54 is installed in the cassette case 51. The guide rollers 55, 56 are made of metal, for example.
Guide rollers 55 and 56 extend across the width of the cassette case and are disposed at predetermined positions to ensure a feeding path for the ink sheet 52 and the recording paper 54.

Here, the ink sheet 52, spool 53 and recording paper 54 are housed in a cassette case 51 as shown in FIG. That is, a back tension mechanism 64 is attached to one end of the spool 52a that winds up the ink sheet 52, and the back tension mechanism 64 applies a load when the ink sheet 52 is wound onto the spool 53. Therefore, the back tension mechanism 64 applies a predetermined tension to the ink sheet 52 to prevent wrinkles from forming. A rewind gear 65 is attached to the other end of the spool 52a, and the rewind gear 65 transmits external driving force to the ink sheet 52. On the other hand, spool 5
A support member 66 is attached to one end of the spool 53, and a winding gear 67 is attached to the other end of the spool 53.

Note that the winding gear 67 is similar to the rewinding gear 65 described above. The recording paper 54 has supporting members 68a and 68b attached to both ends of its axis 54a. Therefore, the ink sheet 52, the spool 53 and the recording paper 54 are connected to the hack tension mechanism 64 and the rewind gear 6.
5, support member 66, winding gear 67 and support member 68
a and 68b, it is rotatably held at a predetermined position in the cassette case 51. Further, the rewinding gear 65 and the winding gear 67 protrude outside the cassette case 51, and when the ink sheet cassette 16 is installed in the recording section 17, an idler provided in a driving means 77 of the recording section 17, which will be described later, They mesh with gears 104 and 105, respectively. In addition,
The hack tension mechanism 64 and rewinding gear 65 collectively constitute ink sheet support means, and the spool 53, support member 66, and winding gear 67 constitute winding means.

Here, the cassette case 51 is divided into a plurality of members (not shown) at predetermined positions in order to attach each of the above-mentioned members, and if the ink sheet cassette 16 is intended to be disposable, each of the above-mentioned members is After the members are attached, the structure is such that they are inseparably bonded using ultrasonic waves or the like, and if the ink sheet cassette 16 is intended to be reused, the multiple members constituting the cassette case 51 can be divided and assembled. Possible structure.

Returning to FIG. 1 again, the recording section 17 is transferred to the thermal
, a platen roller 72, a canter unit 73, paper ejection rollers 74, 75, an end detection sensor 76, and a driving means (not shown) 77. The thermal head 71 is provided with a plurality of heating elements (not shown) across the width direction of the recording paper 54, and the thermal head 71 selectively generates heat based on image information from the control unit 15. The ink layer of the ink sheet 52 supplied between the ink sheet 52 and the abutting platen roller 72 is melted line by line and transferred onto the recording paper 54. The thermal head 71 is held by a head bracket 78, and the head bracket 78 is fixed to the bottom of the main body 11a. The head bracket 78 is also equipped with a pressure mechanism (not shown), which applies pressure with a predetermined biasing force when the heat generating element portion of the thermal head 71 comes into contact with the platen roller 72, thereby bringing the heat generating element into close contact with the platen roller 72. Increase your degree. Therefore, the thermal head 71
When the main body 1a is opened around the support member 35, it is separated from the platen roller 72, and when the main body 11a is closed, it comes into contact with the platen roller 72 and comes into close contact with the platen roller 72. The platen roller 72 is rotated by the driving force from the driving means 77, and the recording paper 54 is rotated by the driving force from the driving means 77.
The recording paper 54 is conveyed to the thermal sub-scan and the cutter unit 73 side every time one line is recorded by the saw 71, and the recording paper 54 cut by the cutter unit 73 is returned so that the margin from the leading edge to the recording start position is extremely small. (for example, around 211). Cutter unit 73
is equipped with a paper cutting mechanism inside, which cuts the conveyed recording paper into predetermined dimensions. The recording paper cut by the cutter unit 73 is discharged onto a copy tray (not shown) by paper discharge rollers 74 and 75.

For example, a photoreflector is used as the end detection sensor 76, and is installed near the opening 62 formed in the cassette case 51 of the ink sheet cassette 16 and at the end of the recording paper 54 through the opening 62. Detect the end mark. Note that in FIG. 1, numbers are not added to the paper guide provided in the recording section.

The driving means 77 winds up and rewinds the ink sheet 520 and drives the platen roller 72, and has a configuration as shown in FIG. 5.6.

Further, the driving means 77 is arranged on a frame 79 provided on the main body 11b.

A stamping motor 81 is fixed to the frame 79, and a belt pulley 82 is fixed to the shaft core 81a of the stamping motor 81. On the other hand, the platen roller 7
The second shaft core 72a is rotatably held by a bush 83, and a platen gear 84 is fixed to one end side of the shaft core 72a. The platen gear 84 is a belt pulley 84
a and a gear 84b are integrally formed, and the belt pulley 84a is connected to the belt pulley 82 by a timing belt 85. Note that the belt pulley 84a of the platen gear 84 is formed to have a larger diameter than the belt pulley 82. Therefore, the rotation of the stemming motor 81 is controlled by the platen roller 7 via the timing belt 85.
2, and the platen roller 72 rotates at a predetermined reduction ratio. On the other hand, the gear 84b of the platen gear 84 is meshed with the friction gear 86.
is arranged coaxially with the friction pulley 87. A felt 88 is housed in the thrust surfaces of the friction gear 86 and the friction pulley 87.
They are rotatable with respect to each other via. Friction pulley 8
7 is inserted into a pin 89 fixed on the frame 79, and is prevented from coming off by an E ring attached to the end of the pin 89. Further, a plate 90 is provided on the pin 89, and a spring 91 is compressed between the plate 90 and the friction gear 86, and the spring 91 applies a predetermined pressing force to the friction gear 86 toward the friction pulley 87. to strengthen

Therefore, driving force is transmitted to the friction gear 86 and the friction pulley 87 by the load (frictional force) due to the pressing force of the felt 88 and the spring 91. As a result, when the driving force input to the friction gear 86 exceeds the load, the felt 88 slips and only a predetermined amount of driving force is transmitted. like this,
The friction gear 86, friction pulley 87, felt 88, plate 90, and spring 91 collectively constitute a friction mechanism 92. On the other hand, a one-way mechanism (first transmission means) is provided at a predetermined position on the frame 79.
93 and a one-way mechanism (second transmission means) 94 are disposed, the one-way mechanism 93 having a function for winding up the ink sheet, and the one-way mechanism 94 having a function for rewinding the ink sheet. The one-way mechanism 93 includes a one-way pulley 95, a one-way gear 96, and a clutch spring 97, which are disposed coaxially with a pin 98 fixed on the frame 79 and are prevented from being removed by an E-ring. The one-way pulley 95 and one-way gear 96 have bodies 95a and 96a of the same diameter, respectively.
and are rotatable with respect to each other. Body 95a, 9
A clutch spring 97 is tightly wound around 6a, and when the one-way pulley 95 rotates in the winding direction of the spring, the clutch spring 97 rotates between the body portion 95a and the clutch spring 97.
96a to transmit the driving force of the one-way pulley 95 to the one-way gear 96.
5 rotates in the spring opening direction, the clutch spring 97 slips on the body parts 95a and 96a, and the driving force of the one-way pulley 95 is not transmitted to the one-way gear 96. That is, the one-way mechanism 93 transmits driving force only in a predetermined constant rotational direction. Note that since the one-way mechanism 94 has the same configuration as the one-way mechanism 93, only different numbers will be added and the explanation will be omitted.

Here, in this embodiment, when the one-way mechanism 93 rotates the one-way pulley 95 clockwise, the one-way gear 96
The one-way mechanism 94 is set to slip when the one-way pulley 95 rotates counterclockwise, and the one-way mechanism 94 slips when the one-way pulley 99 rotates clockwise, causing the one-way pulley 99 to rotate counterclockwise. Then, the setting is made to transmit power to the one-way gear 100. The one-way pulley 95 and the one-way pulley 99 are connected to the friction pulley 87 via the timing belt 103, and the one-way pulley 95 and the one-way pulley 99 each transmit driving force depending on the rotational direction of the friction pulley 87. or slip.

On the other hand, an idle gear 104 is meshed with the one-way gear 96 of the one-way mechanism 93.
An idle gear 105 meshes with the one-way gear 100 . The idle gears 104 and 105 are rotatably supported by pins 106 and 107 fixed on the frame, and when the above-mentioned ink sheet cassette 16 is installed in the recording section 17, the idle gear 104 The idle gear 105 meshes with the winding gear 67, and the idle gear 105 meshes with the rewinding gear 65. Note that the idle gears 104 and 105 are provided to make the rotation direction of the take-up gear 67 and the rewind gear 65 the same as the rotation direction of the one-way gear 95 and the one-way gear 99. Therefore, during recording, the ink sheet 72 is wound up as the recording paper 54 is sub-scanned and conveyed to the cutting position by the rotation of the platen roller 72, and when the recording paper 54 is returned by the reverse rotation of the platen roller 72. The ink sheet 52 is also rewound by a predetermined amount. In addition, in FIG. 6, the one-way mechanism 94, the idle gear 105, the pin 107, and the rewinding gear 65 of the ink sheet cassette 16 that meshes with the idle gear 105 are omitted.

Next, the effect will be explained.

First, the main body 11a and the main body 11b of the facsimile machine 11
When the lock (not shown) is released and the main body 11a is lifted in the direction of arrow F in FIG.
5 and opens to expose the recording section 17 provided inside the main body 11b. At this time, the thermal roller 71 moves away from the platen roller 72 that comes into contact with it and moves together with the main body 11a. Therefore, there is no overlapping member on the recording section 17. Next, the ink sheet cassette 16 is attached to the recording section 17 from above. The ink sheet cassette 16 is mounted so that positioning pins provided on the frame of the main body 11b fit into pin receivers 64 formed on both side surfaces of the cassette case 51.

When the ink sheet cassette 16 is positioned, at the same time, the rewinding gear 65 and the winding gear 67 protruding from the cassette case 51 are engaged with the idle gears 104 and 105 of the driving means 77, respectively. Thereby, the driving force from the driving means 77 is transmitted to the rewinding gear 65 and the winding gear 67, and the driving means 77 can wind up the ink sheet 52 or rewind the ink sheet 52. Also, at this time, the platen roller 72
enters into the cassette case 51 through the opening 60, pushes up the ink sheet 52 and the recording paper 54 from below, and holds them at a predetermined position. The direction in which the ink sheet cassette 16 is attached to the recording section 17 is displayed on the cassette case 51, for example, so even if you are handling this device for the first time, you will definitely be able to attach the ink sheet cassette 16 to the recording section 17. Can be installed.

Next, when the main body 11a is closed, the thermal head 71 enters through the opening 59 and comes into close contact with the platen roller 72 within the cassette case 51. Then, when the wooden body 11a is locked to the main body 11b, the ink sheet cassette 16
installation is completed. When the installation of the ink sheet cassette 16 is completed, a control signal is output from the control section 15 to the driving means 77, and the ink sheet 52 and the recording paper 54 are conveyed by a predetermined amount. Therefore, the slack in the ink sheet 53 is removed and a predetermined puncture tension is applied to the ink sheet 53, and the recording paper 54 is fed to the cutter unit 73 and cut to form a predetermined leading edge margin (details will be described later). ).

When the facsimile device 11 receives image information input via an external line, the facsimile device 11 modulates the image information in the modulation/demodulation circuit 42, and
The data compression/reproduction circuit 43 reproduces the original information and then stores it in the buffer memory 44. The image information stored in the buffer memory 44 is output to the recording section 17 together with a control signal from the control circuit 46, and is recorded and reproduced in the recording section 17. This recording is performed by recording line by line by the thermal head 71 and conveying the recording paper 54 and the ink sheet 52 by the driving means 77. That is, recording section 1
When image information and control signals are input to 7, the heating element of the thermal head 71 selectively generates heat, and the ink sheet 5
One line of recording is performed by melting the second ink layer and thermally transferring it to the recording paper 54. When the stamping motor 81 shown in FIG. 5 rotates counterclockwise in synchronization with the recording timing of 1942 minutes, the platen gear 84 connected via the belt pulley 82 and timing belt 85 rotates counterclockwise. Therefore, the platen roller 73 to which the platen gear 84 is fixed rotates, and the recording paper 54 is conveyed (sub-scanning).

At the same time, when the friction gear 86 connected to the gear 84b of the platen gear 84 rotates clockwise, the rotation of the friction gear 86 is transmitted to the friction pulley 87 via the felt 88. The rotation transmitted to the friction pulley 87 is transmitted to the one-way pulley 95.99 of the one-way mechanism 93.94 via the timing belt 103. When the rotation direction is clockwise (at the time of special recording forward direction conveyance), the one-way mechanism 93 is activated and the winding gear 67 of the ink sheet cassette 16 is connected to the winding gear 67 of the ink sheet cassette 16 via the one-way gear 96 of the one-way mechanism 93 and the idle gear 104. communicated.

Therefore, during recording, the ink sheet 52 can be wound onto the spool 53 in an amount corresponding to the amount of conveyance of the recording paper 54 by the platen roller 72. Also, at this time, since the one-way mechanism 94 is slipping, the ink sheet 52
rotation is not transmitted to. Therefore, when winding up the ink sheet 52, the spool 5 of the ink sheet 52 is
Only pack tension is applied by the back tension mechanism 64 attached to 1a. By the way, spool 5
3, the ink film 52 to be wound up has a small winding diameter at the beginning of winding and the amount of winding per spool 53 revolution is small, but as winding progresses, the winding diameter increases and the winding amount per spool 53 revolution increases. The amount of winding is several times that at the start of winding. Therefore, in order to keep the amount of winding of the ink film 52 constant, a friction mechanism 92 consisting of the friction gear 86, friction pulley 87, felt 88, bottle 89, plate 90 and spring 91 is provided. That is, the spool 53
At the beginning of winding the ink film 52, the winding diameter is small, so the torque at the time of winding is also small. However, as the winding diameter increases, the torque during winding also increases. Therefore, the amount of winding of the ink sheet 52 when the winding diameter of the spool 53 is the minimum is set according to the amount of conveyance of the recording paper 54 by the platen roller 72, and the allowable load (torque) of the friction mechanism is set. By setting
Even if the winding diameter of the ink sheet 52 on the spool 53 becomes large, if the load exceeds the allowable load set in the friction mechanism, the rotation will not be transmitted and the ink sheet 52 will always be wound at a constant amount. Can be rolled up.

Here, when the recording for -page is completed and the recording paper 54 is conveyed to the cutter unit 73 side by the platen roller 72 and cut into a predetermined size, the stepping motor 81 is actuated clockwise by a control signal from the control circuit 46. The platen roller 72 is rotated in the opposite direction. As a result, the recording paper 54
The tip is pulled back toward the thermal head 71 from the cutting position by the cutter unit 73 to form a tip margin.

Note that this leading edge margin is set to, for example, about 2 fl.

On the other hand, when the friction gear 86 rotates counterclockwise with the reverse rotation of the platen roller 72, the rotation of the friction gear 86 is transmitted to the friction pulley 87 as described above, and the one-way mechanism 93.94 is activated via the timing belt 103. It is transmitted to one-way pulley 95.99. At this time, since the rotation direction is counterclockwise, the one-way mechanism 94 operates, and the information is transmitted to the rewinding gear 65 of the ink sheet cassette 16 via the one-way gear 100 and idle gear 105 of the one-way mechanism 94, and the spool 52a is rotated. Rotate clockwise. Therefore, the ink sheet 52 is rewound in an amount corresponding to the amount of the recording paper 54 pulled back by the platen roller 72. At this time, since the one-way mechanism 93 is slipping, the spool 53 is held in a state where it can freely rewind the ink sheet 52, and also applies appropriate tension to the ink sheet 52 to prevent loosening and wrinkles. are doing.

In this way, the ink sheet cassette 16, which stores consumables such as the ink sheet 52 and the recording paper 54 in one case, is attached and removed, and the ink sheet cassette 16, which transmits only the rotation of the platen roller 72 in the conveying direction, to the take-up gear 64 is installed. 1 transmission means;
Since a second transmission means is provided that transmits only the rotation of the platen roller 72 in the direction opposite to the conveying direction to the rewinding gear 65, the ink sheet 52 is not only wound up when the recording paper 54 is conveyed by the platen roller 72; Even when the recording paper 54 is pulled back toward the thermal head 7 side by the reverse rotation of the platen roller 72 after the recording paper 54 is cut, the recording paper 5
The ink sheet 52 can be rewound by the amount by which the ink sheet 4 is pulled back, and the amounts of the ink sheet 52 and recording paper 54 used can be made approximately the same. Furthermore, this allows one end detection sensor 76 to detect each end at the same time. Therefore, it is possible to improve the convenience of the apparatus, and also to eliminate waste of ink sheets and reduce costs.

In this embodiment, one stepping motor 81 is used for both winding and unwinding of the platen roller 72 and the ink sheet 52, but the invention is not limited to this embodiment.

For example, stenoping may be used to take up and unwind the platen roller 72 and the ink sheet 52, and both stepping motors may be driven in synchronization.

(Effects) According to the present invention, the ink sheet can be rewound even when the image recording device pulls back the recording paper by rotating the platen roller in the opposite direction, thereby eliminating wasted ink sheets and reducing costs. .

[Brief explanation of the drawing]

1 to 6 are diagrams showing one embodiment of the image recording apparatus of the present invention, FIG. 1 is a sectional view of a main part of a facsimile machine to which the image recording apparatus is applied, and FIG. 2 is an ink sheet cassette thereof. 3 is an overall perspective view of an ink sheet cassette installed in the image recording device, and FIG. 4 is a sectional view of the upper part of the ink sheet cassette installed in the image recording device. 1 and 5 are general configuration diagrams of a driving means of a facsimile machine to which the image recording apparatus is applied, and FIG. 6 is a sectional view of the main part of FIG. 5. FIG. 7 is a sectional view of a main part of a conventional image recording apparatus. 16... Ink sheet cassette, 17...
... Recording section (recording device), 51 ... Cassette case (case), 53.66.67 ... Spool (winding means), 54 ... Recording paper, 64.65... (ink sheet support means), 9
3...First transmission means, 94...Second transmission means.

Claims (1)

[Claims] (1) A roll of recording paper that is conveyed in a predetermined direction as the platen roller of the recording device rotates, and a roll of recording paper that overlaps the recording paper at least at a predetermined recording position and is conveyed as the recording paper is conveyed. An ink sheet cassette is installed in which an ink sheet, an ink sheet support means for rotatably supporting the ink sheet, and a winding means for winding up the used ink sheet to which the leading end of the ink sheet is fixed are housed in a case. A possible recording device includes a one-way clutch and includes a first transmission means that transmits only rotation of the platen roller in a predetermined direction to the winding means during recording, and a one-way clutch that transmits rotation of the platen roller in a predetermined direction. and second transmission means for transmitting only rotation in the opposite direction to the ink sheet support means.