JP2012111115A - Printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety while suppressing an influence of heat generation.SOLUTION: The printing device includes: a housing; a cover provided in the housing and capable of uncovering an inside space; a heating element provided in the housing; a first radiator provided in the space so that at least a part of it is exposed; a second radiator provided in the housing and lower in radiation efficiency than the first radiator; and a moving mechanism which relatively moves the heating element, the first radiator, and the second radiator and in which, when the cover is closed, the heating element and the first radiator are brought into contact with each other, and in conjunction with the operation of opening the cover, the heating element and the first radiator are separated from each other and the heating element and the second radiator are brought into contact with each other.

Description

  The present invention relates to a printing apparatus.

  As an example of a printing apparatus, an ink jet printer that ejects ink by driving a drive element using a drive signal is known. Such a printer uses a heating element that generates heat during driving. For example, a drive signal generation circuit that generates a drive signal includes a current amplification circuit including a transistor pair, and these transistors generate heat when generating the drive signal. In addition, various motors are used in the printer, and the motor driver that drives these also generates heat similarly. In view of this, there has been proposed a heat sink that dissipates heat generated by a heat generator such as a transistor pair (see, for example, Patent Document 1).

JP 2008-197461 A

Due to space limitations, there is a possibility that the heat dissipator is placed where the user may touch. For example, a heat radiating body may be exposed in an internal space that is opened by opening a printer cover. In this case, if the heat generator is abnormally heated, the user may touch the high-temperature heat radiator. Also, if the heating element and the radiator are separated when there is a possibility that the user may touch the radiator, the radiator can be cooled, but the heat generated by the heating element cannot be released and it fails. It may cause such as.
Therefore, an object of the present invention is to improve safety while suppressing the influence of heat generation.

A main invention for achieving the above object includes a housing, a cover provided in the housing and capable of opening an internal space, a heating element provided in the housing, and at least one in the internal space. A first heat dissipating member provided with an exposed portion, a second heat dissipating member provided inside the housing, wherein the heat dissipating efficiency is lower than that of the first heat dissipating member, and the heat generation A moving mechanism for relatively moving the body, the first radiator, and the second radiator, and when the cover is closed, the heating element and the first radiator are brought into contact with each other, A printing mechanism comprising: a moving mechanism that moves the heating element and the first heat radiating member apart from each other, and moves the heating element and the second heat radiating member in contact with the opening of the cover. Device.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

1 is a block diagram illustrating an overall configuration of a printer. 1 is an external view of a printer 1. FIG. 3A and 3B are diagrams illustrating the internal configuration of the printer 1 of the present embodiment. 4 is a cross-sectional view showing a structure of a head 41. FIG. It is a figure for demonstrating the mode of heat dissipation. 6A and 6B are explanatory diagrams of the first embodiment. 7A and 7B are explanatory diagrams of a modification of the first embodiment. 8A and 8B are explanatory diagrams of the second embodiment.

  At least the following matters will become clear from the description of the present specification and the accompanying drawings.

A housing, a cover provided in the housing and capable of opening an internal space, a heating element provided in the housing, and a first heat dissipation provided at least partially exposed in the internal space And a second heat radiating body provided inside the housing, wherein the second heat radiating body has a lower heat radiating efficiency than the first heat radiating body, the heat generating body, the first heat radiating body, and the first heat radiating body. 2 A moving mechanism for relatively moving the heat dissipating body, wherein when the cover is closed, the heat generating member is brought into contact with the first heat dissipating member, and the heat generation is performed in conjunction with the operation of opening the cover. A printing apparatus is provided that includes a moving mechanism that separates the body from the first heat radiating body and contacts the heat generating body and the second heat radiating body.
According to such a printing apparatus, the temperature of the first radiator that the user may touch when the cover is opened can be lowered, and the heat generated by the heater can be radiated by the second radiator. it can. Therefore, it is possible to improve safety while suppressing the influence of heat generation.

In this printing apparatus, it is preferable that the printing apparatus includes a carriage that is movable in a predetermined direction in the internal space, and the second heat radiator is provided on the carriage.
According to such a printing apparatus, the carriage can be efficiently used for suppressing the influence of heat generation of the heating element and improving the safety.

In this printing apparatus, the moving mechanism mechanically separates the heating element and the first heat radiating member in conjunction with an operation of opening the cover, and the heating element and the second heat radiating member. May be brought into contact with each other.
According to such a printing apparatus, since the open / closed state of the cover is not detected, there is no erroneous detection. Therefore, the effects described above can be obtained more reliably.

The printing apparatus may further include a detection unit that detects an open / closed state of the cover, and the moving mechanism may be configured to detect the heating element based on a detection result of the detection unit indicating that the cover is opened. The first heat radiator may be spaced apart and the heat generator and the second heat radiator may be brought into contact with each other.
According to such a printing apparatus, the heating element, the first radiator, and the second radiator can be relatively moved in accordance with the open / close state of the cover.

In this printing apparatus, the detection unit further detects the temperature of the heat radiator,
The moving mechanism separates the heating element and the first radiator based on a detection result of the detection unit indicating that the cover is opened and the temperature of the radiator is higher than a predetermined value. In addition, it is desirable that the heating element and the second radiator are brought into contact with each other.
According to such a printing apparatus, it is possible to prevent a decrease in heat dissipation efficiency.

  In the following embodiments, description will be made using an inkjet printer as a printing apparatus.

=== Basic Configuration of Printing Apparatus ===
<Printer configuration>
FIG. 1 is a block diagram illustrating the overall configuration of the printer 1. FIG. 2 is an external view of the printer 1. 3A and 3B are diagrams illustrating the internal configuration of the printer 1 according to the present embodiment.

  The printer 1 is an ink jet printer that records (prints) characters and images by ejecting ink onto a medium such as paper, cloth, and film, and is communicably connected to a computer 110 that is an external device.

  A printer driver is installed in the computer 110. The printer driver is a program for displaying a user interface on a display device (not shown) and converting image data output from an application program into print data. This printer driver is recorded on a recording medium (computer-readable recording medium) such as a flexible disk FD or a CD-ROM. Also, the printer driver can be downloaded to the computer 110 via the Internet. In addition, this program is comprised from the code | cord | chord for implement | achieving various functions.

The computer 110 outputs print data corresponding to the image to be printed to the printer 1 in order to cause the printer 1 to print an image.
The printer 1 has a housing 10 and a cover 11 as shown in FIG.
The housing 10 is for housing each unit (described later) of the printer 1 inside.
The cover 11 is provided in the housing 10 so as to be openable and closable, and the internal space (see FIG. 3A) of the printer 1 can be opened by opening the cover 11 (in an open state).

Hereinafter, details of each unit provided in the printer 1 will be described.
The printer 1 includes a transport unit 20, a carriage unit 30, a head unit 40, a detector group 50, a controller 60, and a heat dissipation unit 80. The controller 60 controls each unit based on print data received from the computer 110 that is an external device, and prints an image on a medium. The situation in the printer 1 is monitored by the detector group 50, and the detector group 50 outputs the detection result to the controller 60. The controller 60 controls each unit based on the detection result output from the detector group 50.

<Transport unit 20>
The transport unit 20 is for transporting a medium (for example, paper S) in a predetermined direction (hereinafter referred to as a transport direction). Here, the transport direction is a direction that intersects the moving direction of the carriage. The transport unit 20 includes a paper feed roller 21, a transport motor 22, a transport roller 23, a platen 24, and a paper discharge roller 25 (see FIGS. 3A and 3B).

  The paper feed roller 21 is a roller for feeding the paper inserted into the paper insertion slot into the printer. The transport roller 23 is a roller that transports the paper S fed by the paper feed roller 21 to a printable region, and is driven by the transport motor 22. The operation of the transport motor 22 is controlled by a controller 60 on the printer side. The platen 24 is a member that supports the paper S being printed from the back side of the paper S. The paper discharge roller 25 is a roller for discharging the paper S to the outside of the printer, and is provided on the downstream side in the transport direction with respect to the printable area.

  The transport motor 22 generates heat when driven (rotated) when transporting the medium. A gear train (not shown) provided for transmitting the driving force of the transport motor 22 to the transport rollers also generates heat due to friction during rotation. That is, it can be said that the transport motor 22 and the gear train are heating elements of the printer 1.

<Carriage unit 30>
The carriage unit 30 is for moving (also referred to as “scanning”) the carriage 31 to which the head unit 40 is attached in a predetermined direction (hereinafter referred to as a moving direction). The carriage unit 30 includes a carriage 31 and a carriage motor 32 (also referred to as a CR motor) (see FIGS. 3A and 3B).

  The carriage 31 can reciprocate in the moving direction and is driven by a carriage motor 32. The operation of the carriage motor 32 is controlled by a controller 60 on the printer side. Further, the carriage 31 detachably holds an ink cartridge that stores ink.

  The carriage motor 32 and a gear wheel train (not shown) for moving the carriage 31 using the driving force of the carriage motor 32 generate heat when the carriage 31 is moved. That is, it can be said that the carriage motor 32 and the gear train are heating elements of the printer 1.

<Head unit 40>
The head unit 40 is for ejecting ink onto the paper S. The head unit 40 includes a head 41 having a plurality of nozzles. The head 41 is provided on the carriage 31, and when the carriage 31 moves in the movement direction, the head 41 also moves in the movement direction. Then, when the head 41 is intermittently ejected while moving in the moving direction, dot lines (raster lines) along the moving direction are formed on the paper.

  FIG. 4 is a cross-sectional view showing an example of the structure of the head 41. The head 41 includes a case 411, a flow path unit 412, and a piezo element group PZT. The case 411 houses the piezo element group PZT, and the flow path unit 412 is joined to the lower surface of the case 411. The flow path unit 412 includes a flow path forming plate 412a, an elastic plate 412b, and a nozzle plate 412c. The flow path forming plate 412a is formed with a groove portion serving as a pressure chamber 412d, a through hole serving as a nozzle communication port 412e, a through port serving as a common ink chamber 412f, and a groove portion serving as an ink supply path 412g. The elastic plate 412b has an island portion 412h to which the tip of the piezo element PZT is joined. An elastic region is formed by an elastic film 412i around the island portion 412h. The ink stored in the ink cartridge is supplied to the pressure chamber 412d corresponding to each nozzle Nz via the common ink chamber 412f. The nozzle plate 412c is a plate on which the nozzles Nz are formed. On the nozzle surface, a yellow nozzle row Y for discharging yellow ink, a magenta nozzle row M for discharging magenta ink, a cyan nozzle row C for discharging cyan ink, and a black nozzle row K for discharging black ink are formed. Has been. In each nozzle row, the nozzles Nz are arranged at a predetermined interval D in the transport direction.

  The piezo element group PZT has a plurality of comb-like piezo elements (drive elements), and is provided by the number corresponding to the nozzles Nz. A drive signal COM is applied to the piezo element via a wiring board (not shown) on which the head controller HC and the like are mounted, and the piezo element expands and contracts in the vertical direction according to the potential of the drive signal COM. When the piezo element PZT expands and contracts, the island portion 412h is pushed toward the pressure chamber 412d or pulled in the opposite direction. At this time, the elastic film 412i around the island portion 412h is deformed, and the pressure in the pressure chamber 412d rises and falls, thereby ejecting ink droplets from the nozzles.

<Detector group 50>
The detector group 50 is for monitoring the status of the printer 1. The detector group 50 includes a linear encoder 51, a rotary encoder 52, a paper detection sensor 53, an optical sensor 54, and the like (see FIGS. 3A and 3B).

  The linear encoder 51 detects the position of the carriage 31 in the moving direction. The rotary encoder 52 detects the rotation amount of the transport roller 23. The paper detection sensor 53 detects the position of the leading edge of the paper S being fed. The optical sensor 54 detects the presence or absence of the paper S at the opposite position by the light emitting part and the light receiving part attached to the carriage 31, for example, detects the position of the edge of the paper while moving, and sets the width of the paper. Can be detected. The optical sensor 54 also has a leading edge (an end on the downstream side in the transport direction, also referred to as an upper end) and a rear end (an end on the upstream side in the transport direction, also referred to as the lower end) of the paper S depending on the situation. It can be detected.

<Controller 60>
The controller 60 is a control unit (control unit) for controlling the printer. The controller 60 includes an interface unit 61, a CPU 62, a memory 63, a unit control circuit 64, a head drive circuit 65, and a motor driver 66.

  The interface unit 61 transmits and receives data between the computer 110 that is an external device and the printer 1. The CPU 62 is an arithmetic processing device for performing overall control of the printer 1. The memory 63 is for securing an area for storing a program of the CPU 62, a work area, and the like, and includes a storage element such as a RAM or an EEPROM. Then, the CPU 62 controls each unit such as the transport unit 20 via the unit control circuit 64 in accordance with a program stored in the memory 63.

  The head drive circuit 65 exchanges head drive related information such as transfer of print data and control of print timing between the CPU 62 and the head unit 40. The head drive circuit 65 also generates a drive signal COM (drive waveform) for driving the piezo element PZT. When generating the drive signal COM, the current waveform is amplified using an amplifier in which an NPN transistor and a PNP transistor (both not shown) are configured as push-pull, and a trapezoidal wave having a desired shape is generated. This trapezoidal wave is applied to the head unit 40 to charge / discharge the piezo element PZT. When the piezo element PZT is charged / discharged, the transistor pair generates very high heat, so that it can be said that the head drive circuit 65 is a heating element of the printer 1. The head drive circuit 65 is provided on the printed circuit board 67.

  The motor driver 66 controls the rotation direction and rotation speed of the transport motor 22 and the carriage motor 32. The motor driver 66 incorporates transistors and FETs (not shown), and a current is amplified using a bridge circuit constituted by the transistors and the like when driving various motors. At this time, since the transistor generates very high heat, it can be said that the motor driver 66 is also a heating element of the printer 1.

<Heat dissipation unit 80>
The heat dissipating unit 80 is a heat dissipating device that releases heat generated by a heating element such as the head driving circuit 65 and the motor driver 66 described above to the surrounding atmosphere. Hereinafter, the case where the heat dissipation unit 80 is provided in the head drive circuit 65 that is the highest temperature in the printing operation among the plurality of heating elements described above will be described. The heat radiating unit 80 may be provided for each of the plurality of heat generating elements described above, or designed so that the heat generating elements are arranged as close as possible, and one heat radiating unit 80 common to each heat generating element is provided. You may provide only. The heat radiating unit 80 of this embodiment has two heat radiating bodies (heat radiating body 81 and heat radiating body 82).

  The heat radiating body 81 (corresponding to the first heat radiating body) is a metal plate made of aluminum or iron having high heat radiating efficiency, and heat is generated by radiating heat generated in the heat radiating body from the surface of the heat radiating body 81 to the surrounding atmosphere. To cool the heating element. The radiator 81 is more likely to emit heat as the contact area with the atmosphere is larger. That is, the larger the surface area, the higher the cooling performance. As shown in FIGS. 3A and 3B, in the present embodiment, the heat radiator 81 is formed in a rectangular plate shape along the carriage movement direction so that the surface area becomes as large as possible. In order to further improve the cooling performance, fins may be provided on the surface of the radiator 81 to increase the surface area. As shown in FIG. 3A, the heat radiator 81 is exposed and provided in the internal space of the printer 1 that is opened when the cover 11 is opened.

  The radiator 82 (corresponding to the second radiator) is provided inside the housing 10 behind the radiator 81 and the printed circuit board 67 when viewed from the cover 11 side, and is exposed even when the cover 11 is opened. Not. The heat radiator 82 is made of a material having a lower heat radiation efficiency than the heat radiator 81. In order to dissipate the heat generated by the heat generator, the above-described heat radiator 81 having high heat dissipation efficiency is usually used, and this heat radiator 82 is used in an emergency where the heat radiator 81 cannot be used. The details of the switching of the radiator will be described later.

<Printer operation>
The printing operation of the printer 1 will be briefly described. The controller 60 receives a print command from the computer 110 via the interface unit 61 and controls each unit to perform a paper feed process, a dot formation process, a transport process, and the like.

  The paper feed process is a process of supplying paper to be printed into the printer and positioning the paper at a print start position (also referred to as a cue position). The controller 60 rotates the paper feed roller 21 and sends the paper to be printed to the transport roller 23. Subsequently, the transport roller 23 is rotated, and the paper fed from the paper feed roller 21 is positioned at the print start position.

  The dot formation process is a process for forming dots on paper by intermittently ejecting ink from a head that moves in the movement direction (scanning direction). The controller 60 moves the carriage 31 in the movement direction, and ejects ink from the head 41 based on the print data while the carriage 31 is moving. When the ejected ink droplets land on the paper, dots are formed on the paper, and a dot line composed of a plurality of dots along the movement direction is formed on the paper.

  The carrying process is a process of moving the paper relative to the head in the carrying direction. The controller 60 rotates the transport roller 23 to transport the paper in the transport direction. By this carrying process, the head 41 can form dots at positions different from the positions of the dots formed by the previous dot formation process.

The controller 60 alternately repeats the dot formation process and the conveyance process until there is no more data to be printed, and gradually prints an image composed of dot lines on paper. When there is no more data to be printed, the paper discharge roller is rotated to discharge the paper. The determination of whether or not to discharge paper may be based on a paper discharge command included in the print data.
The same processing is repeated when printing on the next paper, and the printing operation is terminated when not printing.

=== About heat dissipation ===
FIG. 5 is a diagram for explaining a state of heat radiation by the heat radiator 81. In the figure, a head drive circuit 65 is provided on a printed circuit board 67, and a radiator 81 is provided in contact with the head drive circuit 65. The arrows in the figure represent the heat flow during heat dissipation.

  The heat generated by the head drive circuit 65 is dissipated in all directions around a heat source (transistor or the like) represented by the hatched portion in the figure. Since the head drive circuit 65 is formed on the printed circuit board 67, the heat generated by the head drive circuit 65 is also conducted to the printed circuit board 67. That is, when the head drive circuit 65 generates heat, the printed circuit board 67 also generates heat. Therefore, in the present embodiment, the head driving circuit 65 and the printed board 67 are collectively referred to as a heating element.

  The heat generated in the head drive circuit 65 is conducted from the area where the head drive circuit 65 and the heat radiating body 81 are in contact to the inside of the heat radiating body 81, and further conducted through the heat radiating body 81 to the atmosphere from the opposite surface. Is released. Thereby, the head drive circuit 65 is cooled. During such heat dissipation, if the heat generated by the head drive circuit 65 is large, the heat radiator 81 may become very hot. For this reason, although it is desirable to arrange | position the heat radiator 81 in the position which a user cannot touch, for convenience of apparatus design, the heat radiator 81 may have to be arrange | positioned in the position which a user may touch. . In the present embodiment, the heat radiator 81 is exposed in the internal space of the printer 1. In this case, when the user opens the cover 11, there is a risk of touching the high-temperature radiator 81.

  When the user opens the cover 11, if the heating element and the heat dissipation element 81 are separated, the heat dissipation element 81 can be cooled, but the heat generated by the heating element cannot be released. If the temperature of the heating element rises, it may cause failure such as destruction of the transistor.

  Therefore, in the present embodiment, by providing a heat radiating body 82 different from the heat radiating body 81, as will be described later, safety is improved while suppressing the influence of heat from the heat generating body.

=== First Embodiment ===
6A and 6B are explanatory diagrams of the first embodiment. 6A is a diagram illustrating a state (closed state) in which the cover 11 is closed, and FIG. 6B is a diagram illustrating a state (open state) in which the cover 11 is opened. In the figure, the upper side is the upper side and the lower side is the lower side.

  The printer 1 of the present embodiment includes a gear 12a, a gear 12b, and a plate member 68. The gear 12a, the gear 12b, and the plate member 68 correspond to a moving mechanism.

  The gear 12 a is provided around the opening / closing axis C <b> 1 of the cover 11, and rotates in the clockwise direction or the counterclockwise direction about the axis C <b> 1 in conjunction with the opening / closing operation of the cover 11. Specifically, the gear 12a rotates clockwise about the axis C1 when the cover 11 is opened, and rotates counterclockwise about the axis C1 when the cover 11 is closed.

  The gear 12b is provided so as to mesh with the gear 12a, and rotates about the axis C2 in the direction opposite to the direction of rotation of the gear 12a. That is, the gear C2 rotates counterclockwise about the axis C2 when the cover 11 is opened, and rotates clockwise about the axis C2 when the cover 11 is closed.

  The plate-like member 68 is provided at the upper end of the printed circuit board 67. On the upper surface of the plate-like member 68, a linear gear 68a having teeth arranged linearly along the conveying direction is formed. The linear gear 68a is provided so as to mesh with the gear 12b, and the plate member 68 moves in the transport direction along a guide (not shown) according to the direction of rotation of the gear 12b. Specifically, when the gear 12b rotates in the clockwise direction, the plate-like member 68 (and the printed circuit board 67) moves downstream in the transport direction. Conversely, when the gear 12b rotates in the counterclockwise direction, the plate-like member 68 (and the printed circuit board 67) moves to the upstream side in the transport direction.

  Next, an operation when the cover 11 is opened in the printer 1 of the present embodiment will be described with reference to FIGS. 6A and 6B.

  In the state where the cover 11 is closed (closed state), as shown in FIG. 6A, the head drive circuit 65 and the radiator 81 are in contact with each other. For this reason, when the head drive circuit 65 is at a high temperature, the radiator 81 is also at a high temperature (for example, 70 degrees).

  From this state, as shown in FIG. 6B, when the cover 11 is lifted up (that is, the cover 11 is opened), the gear 12a rotates in the clockwise direction around the axis C1 in conjunction with the lift. Thereby, the gear 12b rotates counterclockwise about the axis C2. Furthermore, when the gear 12b rotates counterclockwise, the plate-like member 68 moves to the upstream side in the transport direction. That is, in conjunction with the operation of opening the cover 11, the printed circuit board 67 (and the head drive circuit 65) moves upstream in the transport direction.

  In this way, in conjunction with the operation of opening the cover 11, the heating elements (the head drive circuit 65 and the printed circuit board 67) are separated from the radiator 81 and come into contact with the radiator 82. Since the heat generating body and the heat radiating body 81 are separated from each other, the heat generated by the heat generating body is not conducted to the heat radiating body 81. Further, the radiator 81 is rapidly cooled by being exposed to the outside air. Further, when the heating element comes into contact with the radiator 82, the heat generated by the heating element is radiated by the radiator 82.

  When the cover 11 is closed, the gears move in the opposite direction to the operation for opening the cover 11, and the printed circuit board 67 moves downstream in the transport direction. As a result, when the cover 11 is closed, the heating element is separated from the radiator 82 and contacts the radiator 81 again (FIG. 6A).

  Since the heat radiating body 82 has lower heat radiating efficiency than the heat radiating body 81, in this embodiment, the heat radiating body 82 is used urgently when the cover 11 is opened (that is, when the heat generating body and the heat radiating body 81 are separated). Usually, the heat radiator 81 with high heat radiation efficiency is used. By providing a plurality of heat dissipating bodies in this way and switching between them, safety can be improved while suppressing the influence of heat from the heat generating elements.

  As described above, in the present embodiment, the heating elements (the head drive circuit 65 and the printed board 67) are mechanically moved upstream in the transport direction in conjunction with the operation of opening the cover 11. Thus, the heat radiator 81 and the heat generator are separated from each other, and the heat generator and the heat radiator 82 are brought into contact with each other. Thus, according to the present embodiment, even when the heat radiator 81 is at a high temperature, when the cover 11 is opened, the heat radiator 81 is cooled, so that safety can be improved. Further, in the present embodiment, when the heat generating body and the heat radiating body 81 are separated from each other, the heat generating body is brought into contact with another heat radiating body 82 provided inside the housing 10. For this reason, safety can be improved while suppressing the influence of heat of the heating element.

  In addition, the structure which moves a heat generating body, the heat radiator 81, and the heat radiator 82 relatively is not restricted to what was mentioned above. For example, the lower end of the printed circuit board 67 is pivotally supported and the cover 11 is opened, whereby the upper end of the printed circuit board 67 moves to the right side (upstream in the transport direction) in the drawing and comes into contact with the radiator 82. (In other words, when the cover 11 is opened, the head drive circuit 65 and the printed circuit board 67 may be inclined obliquely).

<Modification of First Embodiment>
7A and 7B are explanatory diagrams of a modified example of the first embodiment. For convenience of explanation, illustration of the moving mechanism (gear 12a, gear 12b, plate-like member 68) is omitted. These moving mechanisms are provided in the same manner as in FIGS. 6A and 6B at positions not shown (positions in the moving direction). Thus, the printed circuit board 67 and the head drive circuit 65 are moved in the transport direction by the operation of opening the cover 11.

  In this modification, as shown in the figure, an L-shaped heat radiator 82 is provided on the upstream surface of the carriage 31 in the transport direction. In this case, for example, if the carriage 31 is stopped at the position of the heating element (position in the movement direction) when the cover 11 is opened, the heat dissipation body 82 is positioned upstream in the conveyance direction. Therefore, as shown in the figure, the heating element can be separated from the radiator 81 and brought into contact with the radiator 82 in conjunction with the operation of opening the cover 11. In addition, since the carriage 31 is stopped so as to cover the highest temperature portion of the radiator 81, it is difficult for the user to touch that portion. As described above, the carriage 31 can be efficiently used for suppressing the influence of heat generated by the heating element and improving the safety.

  In the above-described embodiment, the heating elements (the head drive circuit 65 and the printed circuit board 67) are moved to the upstream side in the transport direction. However, the present invention is not limited to this, and the heating element, the radiator 81, and the radiator 82 are provided. What is necessary is just to come to move relatively. For example, the position of the heating element may be fixed, and the heat radiating body 81 and the heat radiating body 82 may be moved downstream in the transport direction in conjunction with the operation of opening the cover 11. Also in this case, when the cover 11 is opened, the radiator 81 and the head drive circuit 65 are separated from each other, so that the temperature of the radiator 81 can be lowered. In addition, since the heat generating body and the heat radiating body 82 are in contact, the heat generated by the heat generating body can be radiated by the heat radiating body 82.

=== Second Embodiment ===
In the first embodiment, the heating element, the radiator 81, and the radiator 82 are mechanically moved relative to the operation of opening the cover 11, but in the second embodiment, the cover 11 is opened. Is detected electrically. Then, based on the detection result, the heating element, the radiator 81, and the radiator 82 are relatively moved.

  8A and 8B are explanatory diagrams of the second embodiment. 8A is a diagram showing a state where the cover 11 is closed, and FIG. 8B is a diagram showing a state where the cover 11 is opened. In these drawings, the same reference numerals are given to the same components as those in the first embodiment (FIGS. 6A and 6B), and description thereof will be omitted. In the second embodiment, the rotation operation of the gear 12B is controlled by the controller 60.

  In the printer 1 of the second embodiment, as shown in FIGS. 8A and 8B, a sensor group 55 is provided at a contact portion between the cover 11 and the housing 10 as a detector group 50 (corresponding to a detection unit). .

The sensor 55 is a push button type sensor, and outputs a signal indicating whether the cover 11 is in a closed state or an open state to the controller 60 according to whether or not the button is pressed.
For example, as shown in FIG. 8A, when the cover 11 is closed, the sensor 55 is pressed by the cover 11. At this time, the sensor 55 outputs a signal indicating that the cover 11 is closed to the controller 60.
On the other hand, as shown in FIG. 8B, when the cover 11 is opened by the user, the pressing of the sensor 55 by the cover 11 is released. At this time, the sensor 55 outputs a signal indicating that the cover 11 is open to the controller 60.

  When the controller 60 receives a signal indicating that the cover 11 is open from the sensor 55, the controller 60 rotates the gear 12b counterclockwise about the axis c2. As a result, the heating elements (printed circuit board 67 and head drive circuit 65) move upstream in the transport direction. In this way, in conjunction with the operation of opening the cover 11, the heating element is separated from the radiator 81 and contacts the radiator 82.

  When closing the cover, the controller 60 performs the reverse operation of opening the cover. That is, when receiving a signal indicating that the cover 11 is in the closed state from the sensor 55, the controller 60 rotates the gear 12b in the clockwise direction around the axis c2. As a result, the heating elements (printed circuit board 67 and head drive circuit 65) move downstream in the transport direction. Thus, the heating element is separated from the radiator 82 and comes into contact with the radiator 81 (FIG. 8A).

  Thus, in 2nd Embodiment, a heat generating body, a 1st heat radiator, and a 2nd heat radiator can be moved relatively based on the detection result of the open / close state of a cover. In the second embodiment, as in the first embodiment, when the cover 11 is opened, the heating element and the radiator 81 are separated from each other, and the heating element and the radiator 82 are in contact with each other. Therefore, even if the heat generating body and the heat radiating body 81 are at a high temperature, the heat radiating body 81 is rapidly cooled by opening the cover 11 by the user, so that safety can be improved. At this time, since the heat generated by the heating element can be radiated by the heat radiating body 82, the influence of heat generated by the heating element can be suppressed.

<Modification of Second Embodiment>
Also in the second embodiment, similarly to the modified example of the first embodiment, the radiator 31 may be provided on the carriage 31. Further, the position of the heating element may be fixed, and the heat radiating body 81 and the heat radiating body 82 may be moved downstream in the transport direction in conjunction with the operation of opening the cover 11.

  Further, as the detector group 50, a temperature sensor (for example, a thermistor) that detects the temperature of the heating element may be provided. When the cover 11 is in the open state and the detection temperature of the sensor is higher than a predetermined temperature, the heating element and the heat dissipation body 81 are separated from each other so that the heating element and the heat dissipation element 82 are brought into contact with each other. Also good. In the above-described embodiment, regardless of the temperature of the head driving circuit 65 and the heat radiating body 81, each time the cover 11 is opened, the heat generating body and the heat radiating body 81 are separated from each other and the heat generating body and the heat radiating body 82 are brought into contact with each other. I am letting. That is, by opening the cover 11, heat is radiated by the heat radiating body 82 having low heat radiating efficiency regardless of the temperature of the heat generating body. On the other hand, in this case, the radiator 82 can be used only when the cover 11 is opened and the temperature of the heating element is actually abnormal. Therefore, it is possible to prevent a decrease in heat dissipation efficiency.

=== Other Embodiments ===
Although a printer or the like as one embodiment has been described, the above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof. In particular, the embodiments described below are also included in the present invention.

<About the printer>
In the above-described embodiment, a printer (serial printer) that repeatedly performs a transport operation for transporting a medium in the transport direction and a dot formation operation for forming dots on the medium by ejecting ink from the nozzles while moving the head in the movement direction. However, it is not limited to this. For example, a line printer that includes a nozzle row that is longer than the medium width in the medium width direction and prints an image on the medium by ejecting ink from each nozzle of the nozzle row while the medium is being conveyed in the conveyance direction may be used.

<About piezo elements>
In the above-described embodiment, ink is ejected using a piezo element. However, the method of ejecting the liquid is not limited to this. For example, other methods such as a method of generating bubbles in the nozzle by heat may be used.

1 printer, 10 housing, 11 cover,
20 transport units, 21 paper feed rollers, 22 transport motors,
23 transport roller, 24 platen, 25 discharge roller,
30 Carriage unit, 31 Carriage, 32 Carriage motor,
40 head units, 41 heads, 411 case, 412 flow path unit,
412a flow path forming plate, 412b elastic plate, 412c nozzle plate,
412d pressure chamber, 412e nozzle communication port, 412f common ink chamber,
412g Ink supply path, 412h island part, 412i elastic film,
50 detector groups, 51 linear encoder, 52 rotary encoder,
53 Paper detection sensor, 54 Optical sensor,
60 controller, 61 interface, 62 CPU,
63 memory, 64 unit control circuit, 65 head drive circuit,
66 motor driver, 67 printed circuit board,
80 heat radiating unit, 81 heat radiating body, 82 heat radiating body,
110 computer

Claims (5)

A housing,
A cover provided in the housing and capable of opening an internal space;
A heating element provided inside the housing;
A first heat radiator provided with at least a portion exposed in the internal space;
A second heat radiating body provided inside the housing, wherein the heat radiating efficiency is lower than that of the first heat radiating body;
A moving mechanism for relatively moving the heating element, the first radiator, and the second radiator, and when the cover is closed, the heating element and the first radiator are brought into contact with each other. In conjunction with the operation of opening the cover, a moving mechanism that separates the heating element and the first radiator and contacts the heating element and the second radiator;
A printing apparatus comprising: The printing apparatus according to claim 1,
A carriage provided to be movable in a predetermined direction in the internal space;
The printing apparatus, wherein the second heat radiator is provided on the carriage. The printing apparatus according to claim 1 or 2,
The moving mechanism mechanically moves the heating element and the first heat radiating member together with the operation of opening the cover, and causes the heating element and the second heat radiating member to contact each other. A printing device. The printing apparatus according to claim 1 or 2,
A detector that detects an open / closed state of the cover;
The moving mechanism separates the heating element and the first radiator from the detection unit that indicates that the cover is opened, and separates the heating element and the second radiator. Contact,
A printing apparatus characterized by that. The printing apparatus according to claim 4,
The detector further detects the temperature of the radiator;
The moving mechanism separates the heating element and the first radiator based on a detection result of the detection unit indicating that the cover is opened and the temperature of the radiator is higher than a predetermined value. And bringing the heating element and the second radiator into contact with each other,
A printing apparatus characterized by that.

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