JP2003237160A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a jamming treatment and prevent deterioration of an image quality caused by staining of a printing means associated with the jamming treatment in a recorder using a reversible thermal recording medium. <P>SOLUTION: When a front cover 11 is opened, a head supporting member 47 which holds a thermal head 39 falls by its own weight at a shaft 46 as a fulcrum towards the front cover 11, whereby the thermal head 39 and a platen roller 37 are separated from each other. In accordance with the opening of the front cover 11, a cooling roller pair 8 and a discharge roller pair 9 are separated as well. When the front cover 11 is closed, a leaf spring 52 moves a pressure releasing bracket 50 by an amount of allowance at a non screw part 55a of a stepped screw 55 screwed to a fixing frame 49. As a result, the head supporting member 47 is pressed by a coil spring 54 and the thermal head 39 is pressed in contact with the platen roller 37. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device (image forming device) using a reversible thermosensitive recording medium capable of repeatedly printing (image formation).

[0002]

2. Description of the Related Art A recording apparatus of this type is generally called an RWP (rewritable printer) and has a thermoreversible (Therm
Those using a reversible thermosensitive recording medium such as an o-Chromic) film have been put into practical use. The thermoreversible film is provided with a leuco dye and a developer in the recording layer and has a rewritable property as shown in FIG. When the decolored state (A) is heated to, for example, 180 ° C., the leuco dye molecules are melted to develop a color (B), and when rapidly cooled in this state, the leuco dye molecules are agglomerated while coloring and the colored state is fixed (C). When heated to, for example, 120 to 160 ° C. in the color-developed state, the aggregation state collapses and the developer crystallizes by self-aggregation force (D), repels the leuco dye (E), and returns to the decolored state (A). The erasing temperature and the developing temperature differ depending on the constituent material of the film. Corresponding to the characteristics of this thermoreversible film, the recording device
It has a print erasing means for heating and erasing prints, and a printing means for heating and printing. As a printing unit, a configuration is known in which a thermal head is pressed against a platen roller.

In this type of recording apparatus, a conveyance jam may occur as in the case of an image forming apparatus (copying machine, printer, facsimile, etc.) using a recording medium such as plain paper, and a countermeasure against jamming is taken in the structure. Has been taken. For example, Japanese Utility Model Publication No. 6-11999 discloses a recording apparatus in which a main body is provided with an upper cover that can be opened and closed, and a thermal head unit and a recording paper holder are integrally provided on the upper cover. When the upper cover is opened, the thermal head and the platen roller are separated in accordance with this opening operation, the pressure contact state between the thermal head and the platen roller is released, and the jam processing is facilitated.

[0004]

In the structure in which the thermal head is integrally provided on the cover, the platen roller is provided on the main body side, and the thermal head and the platen roller are separated according to the opening operation of the cover, the opening operation of the cover is thermal. Since it also serves to separate the head and platen roller,
Although the jam clearance work is quick and easy, the heating element surface of the thermal head is exposed in the jam clearance work area with the cover open. When the hands of the jam handler touch the surface of the heating element and stain it, predetermined writing (printing) cannot be performed and image quality deteriorates. Even in the case of the reverse configuration in which the thermal head is left on the main body side, the heating element surface of the thermal head is still exposed to the jam processing work area, and there is a similar concern. In a rewritable printer, printing and erasing are repeatedly performed on the same paper. For this reason, such stains on the paper, and eventually stains on the thermal head, have been a serious problem.

Therefore, the main object of the present invention is to provide a recording apparatus which is easy to jam and does not reduce the printing function of the printing means.

[0006]

In order to achieve the above object, in the invention described in claim 1, the recording medium feeding means for feeding the reversible thermosensitive recording medium and recorded on the reversible thermosensitive recording medium. In a recording apparatus having a print erasing means for erasing print contents and a printing means for performing printing on a reversible thermosensitive recording medium, an openable and closable cover is provided on the apparatus main body and the printing means is provided on the apparatus main body side. In addition, the portion of the printing means that holds and conveys the reversible thermosensitive recording medium is released or separated from the pressure when the cover is opened.

According to a second aspect of the invention, in the recording apparatus according to the first aspect, a pair of discharging members for conveying the reversible thermosensitive recording medium is provided downstream of the printing means in the feeding direction, and the discharging member is provided. One of them is provided integrally with the cover.

According to a third aspect of the invention, in the recording apparatus according to the second aspect, the discharging member is a cooling roller for cooling the reversible thermosensitive recording medium that has passed through the printing means.

According to a fourth aspect of the present invention, the first to third aspects are provided.
In the recording apparatus according to any one of above,
A platen roller that conveys the reversible thermosensitive recording medium, and a thermal head that is in pressure contact with the platen roller are provided. A structure is adopted in which a pressing unit for bringing one of the above into and out of contact with the other according to the opening / closing operation of the cover is provided.

According to a fifth aspect of the present invention, in the recording apparatus according to the fourth aspect, the pressing means holds one of the platen roller and the thermal head located on the cover side and has one end pivotally supported. And a biasing mechanism that pushes the head support member toward the other side, the head support member being tilted in a direction away from the other side by its own weight when an external force does not act. Is taking.

According to a sixth aspect of the present invention, in the recording apparatus according to the fifth aspect, the biasing mechanism is provided between the head support member and the cover, and is fixed to the main body of the apparatus. A pressure release member that is supported by a fixed frame and is provided so as to be movable with a predetermined distance in the one contacting and separating direction with respect to the other; and a first elastic member that is provided on the pressure releasing member and presses the head support member. A second elastic member that presses the pressure releasing member toward the other side is provided at the cover facing portion of the cover or the pressure releasing member.

According to a seventh aspect of the invention, in the recording apparatus according to the sixth aspect, the first elastic member is provided so that the pressing force can be adjusted.

According to an eighth aspect of the invention, in the recording apparatus according to the seventh aspect, the first elastic member is a screw member which is screwed to the pressure releasing member and whose screwing amount can be adjusted from the cover side. , And has a spring attached to the other side of the screw member.

According to the ninth aspect of the present invention, the fourth to eighth aspects are provided.
In the recording apparatus described in any one of the above 1, the one is a thermal head and the other is a platen roller.

According to a tenth aspect of the present invention, in the recording apparatus according to any one of the fifth to ninth aspects, the head supporting member has a shape that enhances heat dissipation efficiency.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. First, an overview of the overall configuration of the recording device 2 in this embodiment will be described with reference to FIG. The recording device 2 includes a paper feeding means 4 as a feeding means for feeding a rewritable paper 3 as a reversible thermosensitive recording medium, and a print erasing means 5 provided below the paper feeding means 4.
A printing unit 6, a transport guide member 7 as a cooling zone connecting the print erasing unit 5 and the printing unit 6, a cooling roller pair 8 as a discharging member for transporting the rewritable paper 3 that has passed through the printing unit 6, and the discharging A pair of paper discharge rollers 9 as a member, a device main body 10 that supports the paper feeding unit 4, the print erasing unit 5, and the like, and an openable and closable unit provided on the device main body
A front cover 11 that opens the printing means 6 and the paper discharge area, a pressing means 12 provided between the front cover 11 and the printing means 6, and a motor 1 that is a drive source for elements other than the paper feeding means 4.
It has 3 mag.

As shown in FIG. 2, the paper feeding means 4 has a pickup roller 14 and a feed roller 15, and these rollers are driven by a motor 16. The idler gear 18 meshes with the gear 17 fixed to the rotary shaft 16 a of the motor 16, and the rotary shaft 1 of the idler gear 18
The pickup roller 14 is attached to the gear 19 fixed to 8a.
The gear 20 that rotates in synchronization with the gear 21 and the gear 21 that rotates in synchronization with the feed roller 15 mesh with each other. Reference numeral 22 indicates a conveyance path of the rewritable paper 3. The print erasing means 5 has a receiving port 23 for receiving the rewritable paper 3 at the top.
It has a housing 23 having a discharge port 23b for the rewritable paper 3 at the bottom. A heater roller 24 as a heating member is provided in the housing 23.
A pressure roller 25 as a drive roller that is in pressure contact with the heater roller 24, and a thermistor 26 as a temperature detection unit that detects the temperature of the heater roller 24 are provided. The heater roller 24 has a halogen heater 27 as a heat source inside.

The rewritable paper 3 is the heater roller 2
While being nipped and conveyed by the pressure roller 4 and the pressure roller 25, the heater roller 24 heats it to a decoloring temperature and erases the print content. The ROM of the control means (not shown) stores a relational data table between the kind of material of the rewritable paper 3 and an appropriate decoloring temperature which is obtained in advance by experiments (including computer simulation), and the operation panel (not shown) is stored. When the type of the rewritable paper 3 is input by the input means such as or the type of the rewritable paper 3 is automatically detected, the control means selects the erasing temperature corresponding to the input type or the automatically detected type. , And controls the power supply to the halogen heater 27 based on the detection information of the thermistor 26. The configuration of the print erasing means 5 may be a belt system in which the pressure roller is pressed against an endless belt stretched between the heater roller and the roller, instead of the system in which the heater roller 24 and the pressure roller 25 are pressed against each other.

In this embodiment, one motor 13 drives the components other than the sheet feeding means 4.
This will be described with reference to FIG. A pulley 28 fixed to the rotary shaft of the motor 13 drives a pulley 30 to rotate via a belt 29. A gear 31 that rotates synchronously with the pulley 30 meshes with a gear (not shown) that rotates synchronously with the pressure roller 25 of the print erasing means 5, and thereby the nipping and conveying force of the print erasing means 5 is obtained. The gear 31 meshes with the idler gear 32, and the idler gear 32 meshes with the idler gear 33. The idler gear 33 meshes with the gear 34, and the gear 34 rotates synchronously with the gear 35.
The gear 35 meshes with an idler gear 36, and the idler gear 36 is a platen roller 37 that constitutes the printing unit 6.
Is engaged with a gear (not shown) of the electromagnetic clutch 38 connected to.

The printing means 6 has a platen roller 37 and a thermal head 39 which is in pressure contact with the platen roller 37. The idler gear 33 meshes with the gear 34 and also meshes with the gear 40. A gear 41 that rotates in synchronization with the gear 40 is provided, and the gear 41 meshes with the gear 42. A gear 43 that rotates in synchronization with the gear 42 is provided, and the gear 43 meshes with a gear (not shown) that rotates in synchronization with the drive roller 8a of the cooling roller pair 8 and a gear that does not rotate in synchronization with the drive roller 9a of the paper discharge roller pair 9. ing. The cooling roller pair 8 has the driving roller 8a and the driven roller 8b, and the paper discharge roller pair 9 is the driving roller 9
It has a and a driven roller 9b. The cooling roller pair 8 is
The roller is provided downstream of the printing unit 6 for the purpose of absorbing heat of the rewritable paper 3 provided by the printing unit 6 and also for transporting the rewritable paper 3, and is preferably formed of a material having high thermal conductivity. The driven roller 8b of the cooling roller pair 8 and the driven roller 9b of the paper discharge roller pair 9 are integrally provided on the front cover 11 (described later).

The rewritable paper 3 whose contents have been erased or unprinted by the print erasing means 5 is printed by the thermal head 39 while being conveyed by the platen roller 37. The heating temperature of the thermal head 39 driven based on the image information is set to an appropriate coloring temperature. The ROM of the control means stores a relational data table between the kind of the material of the rewritable paper 3 and an appropriate color development temperature which is obtained in advance by experiments (including computer simulation), and the control means is input. The color development temperature corresponding to the type of the rewritable paper 3 which is automatically detected is selected, and the power supply to the thermal head 39 is controlled.

As shown in FIG. 4, a paper feed outlet sensor 44 as a paper detection means for detecting passage of the rewritable paper 3 is provided in the vicinity of the downstream side of the paper feeding means 4 in the paper feeding direction, and the printing means is provided. A thermal head inlet sensor 45 as a sheet detection unit that detects passage of the rewritable paper 3 is provided in the vicinity of the upstream side of 6 in the sheet feeding direction.
Paper feed outlet sensor 44 and thermal head inlet sensor 45
Has a mechanical sensing arrangement with a sensing filler protruding into the transport path. A photo sensor may be used instead of the mechanical system. In this embodiment, the platen roller 37
In order to prevent the heating element surface of the thermal head 39 from deteriorating due to the rotation of the platen roller 3 during non-sheet passing,
I am trying to rotate 7. That is, the control means controls ON / OFF of the electromagnetic clutch 38 based on the detection information of the rewritable paper 3 by the thermal head inlet sensor 45. As a result, it is possible to solve the problem caused by having one drive source without providing an independent drive source for driving the platen roller 37, and to make the configuration compact and reduce the cost by unifying the drive sources. realizable.

A transport guide member 7 connecting the print erasing means 5 and the print means 6 is formed in a substantially U shape, and the rewritable paper 3 is air-cooled by the heat applied by the print erasing means 5 while passing therethrough. It The shape, length (conveyance distance), material, etc. of the conveyance guide member 7 are appropriately determined based on the results of the cooling experiment. This transport guide member 7
The cooling by contributes to the suppression of temperature rise in the device.

Next, the pressing means 12 will be described with reference to FIGS.
The structure of the front cover 11 and the contact / separation operation between the thermal head 39 and the platen roller 37 will be described. As shown in FIG. 5, the pressing means 12 holds the thermal head 39 provided on the front cover 11 side, and the shaft hole 4 at the lower end portion.
A head support member 47 rotatably supported by a shaft 46 (see FIG. 6) on the apparatus main body 10 side via 7a, and a biasing mechanism 48 for pressing the head support member 47 toward the platen roller 37 side. ing. The head support member 47 is formed so as to tilt in a direction away from the platen roller 37 by its own weight with the shaft 46 as a fulcrum when no external force acts.
The biasing mechanism 48 is provided between the head support member 47 and the front cover 11, and is fixed to the fixed frame 49 (not shown in FIG. 5) fixed to the apparatus main body 10, and the fixed frame 49, and the platen roller 37. Against thermal head 39
A pressure releasing bracket 50 as a pressure releasing member that is movable in a predetermined distance in the contacting and separating direction, and a first elastic member 51 that is provided on the pressure releasing bracket 50 and presses the head supporting member 47. There is. The front cover 11 is provided with a plate spring 52 as a second elastic member that presses the pressure release bracket 50 toward the platen roller 37 side. The leaf spring 52 may be provided at a portion of the pressure release bracket 50 facing the front cover 11.

As shown in FIG. 6, the first elastic member 51.
Has an adjusting screw 53 screwed into the pressure release bracket 50 and having a screwdriver operation surface exposed to the front cover 11 side, and a coil spring 54 having a proximal end fixed to the thermal head 39 side of the adjusting screw 53. ing. When the front cover 11 is closed, the leaf spring 52 presses the pressure release bracket 50, and the coil spring 54 presses the head support member 47 accordingly. As a result, the pressure contact state of the thermal head 39 with respect to the platen roller 37 is obtained. Therefore, adjusting screw 5
By rotating 3, the pressure contact force of the thermal head 39 with respect to the platen roller 37 can be adjusted.

A stepped screw 55 is screwed into the fixed frame 49, and the pressure release bracket 50 is engaged with a non-threaded portion 55a of the stepped screw 55 through a hole 50a and is prevented from coming off by a collar 55b. There is. The allowance t in the non-screw part 55a when the front cover 11 is closed is a movable interval of the pressure release bracket 50. The head support member 47 has a shape that enhances heat dissipation efficiency in order to reduce an increase in ambient temperature due to heating of the thermal head 39. The head support member 47 itself also has a heat dissipation function,
In order to obtain a further heat dissipation function, a heat dissipation bracket 56 as a heat dissipation fin having a U-shaped cross section and extending in the axial direction of the platen roller 37 is provided on the surface of the head support member 47 on the front cover 11 side. There is. Heat dissipation bracket 56
May be formed integrally with the head support member 47. From the viewpoint of enhancing the heat dissipation function, it is desirable that the head support member 47 and the heat dissipation bracket 56 are made of a material having high thermal conductivity.

As shown in FIG. 5, on the apparatus main body 10 side,
The discharge guide plate 57 is provided at a position corresponding to the upper portion of the front cover 11.
A drive roller 8a of the cooling roller pair 8 and a drive roller 9a of the paper discharge roller pair 9 are supported by the paper discharge guide plate 57. The roller shape of the cooling roller pair 8 is formed as a single body to enhance the cooling function, and the roller shape of the paper discharge roller pair 9 is composed of a plurality of narrow rollers to enhance the paper discharge function. The discharge guide plate 57 is provided with a plurality of ventilation slits 57a for enhancing the cooling function. From the same viewpoint, the pressure release bracket 50 also has a plurality of ventilation slits 50a. A driven roller 8b of the cooling roller pair 8 and a driven roller 9b of the paper discharge roller pair 9 are rotatably supported on the front cover 11. The front cover 11 is also formed with a plurality of ventilation slits 11a to enhance the cooling function. A shaft 11b serving as a fulcrum at the time of opening and closing is formed on both sides of the lower end portion of the front cover 11, and the shaft 11b is engaged with a shaft hole (not shown) of the device body 10 when mounted on the device body 10.

When a jam occurs, the front cover 11 is opened as shown in FIG. When the front cover 11 is opened, the pressing force applied to the pressure release bracket 50 by the leaf spring 52 is released, and the head support member 47 tilts by its own weight while pushing the pressure release bracket 50 toward the front cover 11 side.
This causes the thermal head 39 to move to the platen roller 37.
From the separation corresponding to the above-mentioned allowance t. Since the cooling roller pair 8 and the paper discharge roller pair 9 are also separated, the rewritable paper 3 jammed in the printing means 6 and the paper discharge area can be easily removed. The thermal head 39 and the platen roller 37 are only slightly separated on the apparatus main body 10 side, and the heating element surface of the thermal head 39 is not exposed in the jam processing work area. There is no worry about getting dirty. In this embodiment, the thermal head 39 and the platen roller 37 are completely separated, but the pressure may be released so that the jammed paper can be easily taken out. Further, the same function can be obtained even if the platen roller 38 and the thermal head 39 are reversed in position and the platen roller 38 is supported by the head supporting member 47.

[0029]

According to the first aspect of the present invention, recording medium feeding means for feeding the reversible thermosensitive recording medium, and print erasing means for erasing the print content recorded on the reversible thermosensitive recording medium, In a recording apparatus having a printing unit for printing on a reversible thermosensitive recording medium, an openable and closable cover is provided on the apparatus main body and the printing unit is provided on the apparatus main body side, and with the opening operation of the cover, Since the portion of the printing means for sandwiching and transporting the reversible thermosensitive recording medium is released or separated from the pressure, the pressure of the sandwiching and transporting portion (nip portion) of the printing means is automatically released with the opening / closing operation of the cover. Or, since the nipping / conveying portion can be separated from each other, the jam processing can be easily performed, and the printing by the printing means which has been a big problem in the rewritable printer due to the jam processing work. It is possible to prevent the deterioration of image quality without fear of contamination of the wood.

According to the second aspect of the present invention, in the recording apparatus according to the first aspect, a pair of discharging members for conveying the reversible thermosensitive recording medium is provided downstream of the printing means in the feeding direction, and the discharging member is provided. Since one of the members is integrally provided on the cover, it is possible to further improve the jam handling property of the printing unit and the discharge area.

According to the third aspect of the present invention, in the recording apparatus according to the second aspect, the discharging member is a cooling roller for cooling the reversible thermosensitive recording medium that has passed through the printing means. It is possible to further improve the jam handling property of the means and the discharge area.

According to a fourth aspect of the present invention, in the recording apparatus according to any one of the first to third aspects, the printing means includes a platen roller that conveys a reversible thermosensitive recording medium,
A thermal head is provided in pressure contact with the platen roller, and one of the platen roller and the thermal head, which is located on the cover side, and the cover are connected to each other in accordance with the opening / closing operation of the cover. Since the pressing means for contacting and separating from each other is provided, it is possible to automatically release the pressure between the thermal head and the platen roller or separate the thermal head and the platen roller in accordance with the opening / closing operation of the cover. Therefore, it is possible to easily perform the jam processing, and it is possible to prevent the image quality from being deteriorated without worrying that the heating element surface of the thermal head is contaminated by the jam processing operation which has been a particularly serious problem in the rewritable printer.

According to a fifth aspect of the present invention, in the recording apparatus according to the fourth aspect, the pressing means holds one of the platen roller and the thermal head, which is located on the cover side, and the one end side of which is a shaft. A structure in which a head supporting member is supported and rotatably provided, and tilts in a direction away from the other by its own weight when an external force does not act, and a biasing mechanism that presses the head supporting member toward the other side. Therefore, the pressure releasing or separating operation between the thermal head and the platen roller can be obtained with a simple configuration.

According to a sixth aspect of the present invention, in the recording apparatus according to the fifth aspect, the biasing mechanism includes a fixed frame provided between the head support member and the cover and fixed to the apparatus main body. A pressure releasing member that is supported by the fixed frame and is movable in a contacting and separating direction with respect to the other one by a predetermined distance, and a first elastic member that is provided on the pressure releasing member and presses the head supporting member. Since the cover or the cover facing portion of the pressure releasing member is provided with the second elastic member that presses the pressure releasing member to the other side, a space between the thermal head and the platen roller is provided. The pressure releasing or separating operation can always be obtained in a constant state.

According to the seventh aspect of the invention, in the recording apparatus according to the sixth aspect, since the first elastic member is provided so that the pressing force can be adjusted, the platen roller and the thermal head are provided. The pressure contact force between them can be optimized, and an image quality with uniform color density of the reversible thermosensitive recording medium can be obtained.

According to an eighth aspect of the present invention, in the recording apparatus according to the seventh aspect, the first elastic member is screwed to the pressure releasing member, and the screwing amount can be adjusted from the cover side. Since the member and the spring attached to the other side of the screw member are provided, the pressure contact force between the platen roller and the thermal head can be easily adjusted with a simple structure.

According to the ninth aspect of the present invention, in the recording apparatus according to any of the fourth to eighth aspects, one of the thermal heads is a thermal head and the other is a platen roller. The surface of the heating element faces inward with respect to the cover, and the risk of contamination of the surface of the heating element during jam processing can be further reduced.

According to the invention of claim 10, claim 5
In the recording apparatus according to any one of items 1 to 9, since the head support member has a shape that enhances heat dissipation efficiency, it is possible to suppress a temperature rise due to heat storage around the printing unit. In order to perform high-quality printing in this type of rewritable printer, it is important to raise the temperature from a low temperature to a rapid temperature rise, but the present invention enables high-quality printing with a simple configuration.

[Brief description of drawings]

FIG. 1 is a schematic front view of a recording apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of a sheet feeding unit and a print erasing unit.

FIG. 3 is a diagram showing a driving force transmission configuration by one motor.

FIG. 4 is a diagram showing a sheet detection configuration in a conveyance path.

FIG. 5 is an exploded perspective view of a printing unit and a paper discharge area.

FIG. 6 is a schematic cross-sectional view of a state in which a cover in a printing unit and a paper discharge area is closed.

FIG. 7 is a schematic cross-sectional view of a state in which a cover in the printing unit and a paper discharge area is opened.

FIG. 8 is a diagram showing a decoloring / coloring mechanism of a reversible thermosensitive recording medium.

[Explanation of symbols]

3 Rewritable paper as a reversible thermosensitive recording medium 4 Paper feeding means as recording medium feeding means 5 Erasing means 6 printing means 8 Cooling roller pair as discharge member 9 Discharge roller pair as discharge member 10 Device body 12 Pressing means 37 Platen roller 39 thermal head 47 Head support member 48 biasing mechanism 49 fixed frame Pressure release bracket as 50 pressure release member 51 First Elastic Member 52 Leaf spring as second elastic member 53 Adjustment screw as screw member 54 Coil spring as spring

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C058 AB16 AC06 AF03 AF25 AF31                       DA10                 2C059 AA22 AA26 AA70                 3F049 AA04 CA32 DA12 DA14 DB02                       LA02 LA05 LA07 LB03

Claims (10)

[Claims] 1. A recording medium feeding means for feeding a reversible thermosensitive recording medium, a print erasing means for erasing print contents recorded on the reversible thermosensitive recording medium, and a printing for printing on the reversible thermosensitive recording medium. In the recording device having means, the main body of the apparatus is provided with a cover that can be opened and closed, and the printing means is provided on the side of the main body of the apparatus. When the cover is opened, the reversible thermosensitive recording medium of the printing means is provided. A recording apparatus in which a portion to be nipped and conveyed is released from pressure or separated. 2. The recording apparatus according to claim 1, further comprising a pair of discharge members for conveying the reversible thermosensitive recording medium downstream of the printing means in the feeding direction, one of the discharge members being integrated with the cover. A recording device provided in the. 3. The recording apparatus according to claim 2, wherein the discharging member is a cooling roller that cools the reversible thermosensitive recording medium that has passed through the printing means. 4. The recording apparatus according to claim 1, wherein the printing unit includes a platen roller that conveys a reversible thermosensitive recording medium, and a thermal head that presses against the platen roller. Between one of the platen roller and the thermal head, which is located on the cover side, and the cover, there is provided pressing means for bringing the one into contact with and away from the other in association with the opening / closing operation of the cover. A recording device characterized by. 5. The recording apparatus according to claim 4, wherein the pressing means holds one of the platen roller and the thermal head located on the cover side, and has one end pivotally supported so as to be rotatable. And a biasing mechanism for pressing the head support member toward the other side when the external force is not applied and the head support member tilts in the direction away from the other side by its own weight. 6. The recording apparatus according to claim 5, wherein the urging mechanism is provided between the head support member and the cover, and is fixed to a main body of the apparatus. The fixed frame is supported by the fixed frame. A pressure releasing member provided so as to be movable by a predetermined distance in the one of the contact and separation directions with respect to the other
A second elastic member provided on the pressure releasing member for pressing the head supporting member, and a second elastic member for pressing the pressure releasing member to the other side of the cover or the cover facing portion of the pressure releasing member. The recording device is provided with the elastic member. 7. The recording apparatus according to claim 6, wherein the first elastic member is provided so that the pressing force can be adjusted. 8. The recording apparatus according to claim 7, wherein the first elastic member is screwed to the pressure releasing member, and the screw amount of which is adjustable from the cover side, and the screw member. A recording apparatus having a spring attached to the other side. 9. The recording apparatus according to claim 4, wherein the one is a thermal head and the other is a platen roller. 10. The recording apparatus according to claim 5, wherein the head supporting member has a shape that enhances heat dissipation efficiency.