JP2007313657A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of discharging a leakage gas created by sublimation of ink on an ink sheet during the printing and foreign matter such as dust possibly causing defective printing, to the outside of the apparatus while improving a heat-radiation efficiency of a heat radiation member. <P>SOLUTION: This image forming apparatus (thermal transfer printer) comprises an apparatus body 100 including a print head section 12, an ink cartridge 200 which is detachably attached to the apparatus body 100 and has an ink sheet housing section 202a for accommodating an ink sheet 201, a fan 30 provided to the apparatus body 100 and adapted to discharge the heat of the print head section 12 to the outside, and the heat-radiation member 12c for radiating the heat of the print head section 12. The heat-radiation member 12c is provided to the print head section 12 so as to bridge over the ink sheet housing section 202a and has a plurality of slit-like rectangular slots 12i communicating with the ink sheet housing section 202a at a part opposite to the fan 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus provided with a heat dissipation member and a fan.

  Conventionally, an image forming apparatus including a heat radiating member and a fan is known. (For example, refer to Patent Documents 1 to 4).

  In the image forming apparatus described in Patent Document 1, the single heat radiating member connected to the print head unit is higher than the first plane unit on which the print head unit is stacked and the first plane unit. It is comprised from the 2nd plane part in a position, and one inclined surface part which connects a 1st plane part and a 2nd plane part. A plurality of slits are formed across the first flat surface portion and one inclined surface portion. A cooling fan is installed below the second flat surface portion of the heat radiating member inside the housing. The cooling fan cools the heat dissipating member and also cools the print head unit through the plurality of slits. In Patent Document 1, it is considered that the cooling fan disposed inside the casing is configured to blow air against the heat dissipation member and the print head unit.

  Further, in the image forming apparatus described in Patent Document 2, the top surface of the print head unit has a plane area substantially equal to the area of the top surface of the print head unit, and a plurality of sheets are perpendicular to the top surface of the print head unit. The heat radiating member in which the heat radiating fin is formed is provided. Further, a cooling fan is provided on the side surface of the apparatus main body at a predetermined distance from the heat radiating member, and the cooling fan and the heat radiating fin are connected by a blower duct. The cooling fan sucks unheated air outside the apparatus and sends the sucked air to the radiating fin side through the duct to cool the radiating fin.

  In addition, in the image forming apparatus described in Patent Document 3, a plurality of sheets are provided on the upper surface of the print head unit that has a plane area that is substantially equal to the area of the upper surface of the print head unit, and that is perpendicular to the upper surface of the print head unit. The heat radiating member in which the heat radiating fin is formed is provided. In addition, a cooling fan is provided so as to be in contact with one side surface of the radiating fin, and the radiating fin and the cooling fan are built in the apparatus main body. The air flow of the cooling fan is allowed to pass only through the heat radiating fins to cool the heat radiating member. In Patent Document 3, since the cooling fan is built in the apparatus main body, it is considered that a part of the radiated air circulates inside the apparatus.

  Further, in the image forming apparatus described in Patent Document 4, the print head unit is sandwiched between the ink ribbon supply unit and the ink ribbon winding unit of the ink sheet cartridge and is disposed directly above the printing paper conveyance path. Has been. A heat dissipating member formed by bending the aluminum plate twice in a U shape is fixed to the upper portion of the print head portion. In addition, a cooling fan is provided on the heat dissipation member. The air flow by the cooling fan flows while the heat radiating member is in the strongest contact with the portion facing the cooling fan (the end of the heat radiating member close to the fan), thereby cooling the heat radiating member.

JP 2000-203123 A Japanese Unexamined Patent Publication No. 7-117315 JP 2003-237123 A JP 2005-74720 A

  However, in the image forming apparatus described in Patent Document 1, since the heat dissipating member is composed of only two plane portions and one inclined surface portion, it is difficult to increase the surface area of the heat dissipating member more sufficiently. There is an inconvenience. For this reason, there is a problem that it is difficult to further improve the heat dissipation efficiency. In addition, the cooling fan of Patent Document 1 is arranged inside the casing and is considered to blow air against the heat dissipation member and the print head unit. There is also a problem that it is difficult to discharge to the outside.

  Further, in the image forming apparatuses described in Patent Documents 2 and 3, the air flow formed by the cooling fan mainly circulates through the fin portion of the heat radiating member, so that it is used only for cooling the heat generated from the heat radiating member. The Therefore, when applied to a thermal transfer printer or the like, air flow does not act on foreign matter such as leakage gas at the edge of the printing paper during ink sublimation during printing or dust that causes printing defects. There is a problem that foreign matters such as leaking gas and dust remain.

  Moreover, in the image forming apparatus described in Patent Document 4, although the heat radiating member is bent into a U shape to increase the heat transfer area, the air flow formed by the cooling fan is at the portion of the heat radiating member facing the cooling fan. The airflow of the cooling fan does not reach the other inner heat transfer surface that is most strongly circulated and bent, and the airflow is poor. For this reason, since the local heat transfer rate in a heat radiating member falls, there exists a problem that it is difficult to improve heat dissipation efficiency more. In addition, the cooling fan disclosed in Patent Document 4 is disposed inside the housing and is considered to blow air against the heat dissipation member and the print head unit. Therefore, foreign matter such as dust that causes defective printing is removed. There is also a problem that it is difficult to discharge to the outside.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to improve the heat radiation efficiency of the heat radiating member while leaking gas due to ink sublimation of the ink sheet during printing. Another object of the present invention is to provide an image forming apparatus capable of discharging foreign matter such as dust that causes printing failure to the outside of the apparatus.

Means for Solving the Problems and Effects of the Invention

  An image forming apparatus according to a first aspect of the present invention includes an apparatus main body including a print head unit, an ink sheet cartridge that is detachably attached to the apparatus main body and that stores an ink sheet, and an apparatus main body. In the image forming apparatus provided with the fan for discharging the heat of the print head unit to the outside, the print head unit is provided so as to straddle the ink sheet storage unit, and the ink sheet is stored in a portion facing the fan. And a heat radiating member for dissipating heat from the print head unit, and a plurality of holes or notches leading to the ink sheet storage unit are provided. And a pair of rotating arms for rotatably supporting the print head unit at both ends. The hole or notch that is installed near the hole or notch of the heat dissipating member and communicates with the ink sheet storage part is the air flow from the ink sheet storage part on the inner peripheral side of the heat dissipating member due to the suction of the fan And it is formed in the size which can ensure both the flow of the air from the outer peripheral side of a heat radiating member.

  In the image forming apparatus according to the first aspect, as described above, the heat dissipating member for dissipating the heat of the print head portion is provided in the print head portion so as to straddle the ink sheet storage portion, thereby two flat portions. Since the heat radiating member consisting of two inclined surface portions can be formed, the length of the heat radiating member can be increased compared to the heat radiating member consisting of two flat surface portions and one inclined surface portion. The surface area of the heat dissipation member can be further increased. Thereby, heat dissipation efficiency can be improved more. Further, even when the heat radiating member is formed so as to straddle the ink sheet storage portion by disposing a hole or a notch in a portion of the heat radiating member facing the fan, the print head is inserted through the hole or the notch. Since the air flow from the inner peripheral side of the heat radiating member to the outside can be formed by the fan for discharging the heat of the part to the outside, it is possible to suppress the heat from spreading to the inner peripheral side of the heat radiating member. it can. That is, in this invention, since the flow of the air from the inner peripheral side of a heat radiating member to the exterior can be ensured, increasing the surface area of a heat radiating member, heat dissipation efficiency can be improved further. In addition, since the fan for discharging the heat of the print head part to the outside through the hole or notch can form an air flow from the inner peripheral side of the heat radiating member to the outside, the ink at the time of printing Foreign matter such as leakage gas due to ink sublimation of the sheet and dust that causes printing defects generated on the inner peripheral side of the heat radiating member can be discharged to the outside.

  In the image forming apparatus according to the first aspect, a plurality of holes or notches leading to the ink sheet storage unit are provided, so that one hole or notch is provided as compared with a case where one hole or notch is provided. In the case of providing a plurality of holes or notches having the same total opening area as the opening area, the surface area of the inner surface of the holes or notches can be further increased, so that the heat radiation efficiency can be further improved. . In addition, the heat dissipating member is attached to the upper surface of the print head unit, and a pair of rotating arms for rotatably supporting the print head unit are provided at both ends so that the rotating arm is separated. Since there is no need to provide parts, an increase in the number of parts can be suppressed. Moreover, the fan can be easily discharged to the outside by the fan by dissipating the heat radiated by the heat radiating member by being installed in the vicinity of the portion of the heat radiating member provided with the hole or notch. Further, the hole or notch leading to the ink sheet storage unit ensures both the air flow from the ink sheet storage unit on the inner peripheral side of the heat dissipation member and the air flow from the outer peripheral side of the heat dissipation member by suction of the fan. In addition to the air flow from the ink sheet storage portion on the inner peripheral side of the heat dissipation member to the fan, the air flow from the outer peripheral side of the heat dissipation member Heat can be discharged to the outside in a balanced manner from both the inner peripheral side and the outer peripheral side. As a result, the heat dissipation efficiency can be further improved.

  An image forming apparatus according to a second aspect of the present invention includes an apparatus main body including a print head unit, an ink sheet cartridge that is detachably attached to the apparatus main body and stores an ink sheet, and an apparatus main body. A fan for discharging heat of the print head unit to the outside, and a hole or notch provided in the print head unit so as to straddle the ink sheet storage unit and leading to the ink sheet storage unit in a portion facing the fan And a heat dissipating member for dissipating the heat of the print head unit.

  In the image forming apparatus according to the second aspect, as described above, the heat dissipating member for dissipating the heat of the print head portion is provided in the print head portion so as to straddle the ink sheet storage portion, thereby two flat portions. Since the heat radiation member consisting of two inclined surface portions can be formed, the length of the heat radiation member can be increased compared to the heat radiation member consisting of two flat surface portions and one inclined surface portion, The surface area of the heat dissipation member can be further increased. Thereby, heat dissipation efficiency can be improved more. Further, even when the heat radiating member is formed so as to straddle the ink sheet storage portion by disposing a hole or a notch in a portion of the heat radiating member facing the fan, the print head is also inserted through the hole or the notch. Since the air flow from the inner peripheral side of the heat radiating member to the outside can be formed by the fan for discharging the heat of the part to the outside, it is possible to suppress the heat from spreading to the inner peripheral side of the heat radiating member. it can. That is, in the present invention, since the air flow from the inner peripheral side of the heat radiating member to the outside can be ensured while increasing the surface area of the heat radiating member, the heat radiating efficiency can be further improved. In addition, since a fan for discharging the heat of the print head unit to the outside through the hole or notch can form an air flow from the inner peripheral side of the heat radiating member to the outside, the ink at the time of printing Foreign matter such as leakage gas due to ink sublimation of the sheet and dust that causes printing defects generated on the inner peripheral side of the heat dissipation member can be discharged to the outside.

  In the image forming apparatus according to the second aspect, preferably, a plurality of holes or notches leading to the ink sheet storage portion are provided. If comprised in this way, compared with the case where one hole or notch is provided, the case where a plurality of holes or notches having the same total opening area as the opening area of the one hole or notch is provided. Since the surface area of the inner surface of the hole or notch can be further increased, the heat dissipation efficiency can be further improved.

  In this case, preferably, the heat dissipating member is attached to the upper surface of the print head unit, and a pair of rotating arms for rotatably supporting the print head unit is provided at both ends. If comprised in this way, since it is not necessary to provide a rotation arm with another component, the increase in a number of components can be suppressed.

  In the image forming apparatus according to the second aspect, the fan is preferably installed in the vicinity of a portion where the hole or notch of the heat radiating member is provided. If comprised in this way, the heat radiated by the heat radiating member can be easily discharged to the outside by the fan.

  In the image forming apparatus according to the second aspect, it is preferable that the hole or notch leading to the ink sheet storage portion is a flow of air from the ink sheet storage portion on the inner peripheral side of the heat dissipation member due to suction of the fan and the heat dissipation member. It is formed in a size that can ensure both the air flow from the outer peripheral side. If comprised in this way, not only the flow of the air from the ink sheet storage part of the inner peripheral side of a heat radiating member to a fan but the air flow from the outer peripheral side of a heat radiating member is also the inner peripheral side and outer peripheral side of a heat radiating member. Heat can be discharged from both sides in a well-balanced manner. As a result, the heat dissipation efficiency can be further improved.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view showing the overall configuration of a thermal transfer printer according to an embodiment of the present invention. 2 to 7 are views showing a detailed structure of a thermal transfer printer according to an embodiment of the present invention. First, the structure of a thermal transfer printer according to an embodiment of the present invention will be described with reference to FIGS. In this embodiment, a case where the present invention is applied to a thermal transfer printer which is an example of an image forming apparatus will be described.

  In the thermal transfer printer according to this embodiment, as shown in FIGS. 1 and 2, an ink sheet cartridge 200 is mounted on the apparatus main body 100. The apparatus main body 100 includes a printing unit 10 that performs printing, a resin casing 20 in which the printing unit 10 is housed, a fan 30 that discharges heat generated in the printing unit 10 to the outside, and a fan 30. A fan cover 40 for fixing the inner surface 20a of the body 20, screws 41 and 42 for fixing the fan 30 to the fan cover 40, and screws for fixing the fan cover 40 to the inner surface 20a of the housing 20. 43 and 44.

  Further, as shown in FIGS. 1 to 4, the printing unit 10 conveys a metal chassis 11, a print head unit 12 and a platen roller 13 for performing printing, and a sheet 50 (see FIG. 4). The feed roller 14 and the pressing roller 15, and the paper feed roller 16 for conveying the paper 50 (see FIG. 4) from the outside to the inside of the printing unit 10. In addition, an ink sheet cartridge 200 containing an ink sheet 201 is detachably inserted into the printing unit 10 of the thermal transfer printer. Further, a paper feed cassette (not shown) in which paper 50 (see FIG. 4) is housed is detachably attached to the thermal transfer printer.

  Moreover, the chassis 11 has the one side surface 11a, the other side surface 11b, and the bottom surface 11c which connects the one side surface 11a and the other side surface 11b. An insertion hole 11 d for inserting the ink sheet cartridge 200 into the printing unit 10 is provided on the other side surface 11 b of the chassis 11. The ink sheet cartridge 200 includes ink sheet storage portions 202a and 202b and connection portions 203a and 203b that connect the ink sheet storage portions 202a and 202b.

  The print head unit 12 includes a pair of rotating arms 12a, a print unit 12b, and a heat radiating member 12c. A pair of rotating arms 12a is provided with a support shaft 12d. The print head unit 12 is configured such that the print unit 12b is pressed against or separated from the platen roller 13 by a pair of rotating arms 12a rotating about a support shaft 12d.

  Here, in this embodiment, as shown in FIGS. 2-7, the heat radiating member 12c consists of aluminum etc., and has the function to radiate the heat which the printing part 12b emits. The heat radiating member 12c is attached to the upper surface of the printing unit 12b and is formed to extend toward the fan 30 side. The portion of the heat radiating member 12 c that extends toward the fan 30 is provided so as to straddle one ink sheet storage portion 202 a of the ink sheet cartridge 200, and the end portion reaches the vicinity of the fan 30. That is, the heat radiating member 12c connects the flat surface portion 12e that contacts the upper surface of the printing portion 12b, the flat surface portion 12f that is positioned above one ink sheet storage portion 202a of the ink sheet cartridge 200, and the flat surface portions 12e and 12f. An inclined surface portion 12g and an inclined surface portion 12h facing the fan 30 are included. Further, a plurality of slit-like rectangular holes 12i are provided in a portion of the inclined surface portion 12h of the heat radiation member 12c facing the fan 30. Moreover, the notch part 12j for letting the flat cable 17 escape is provided in the one side edge part of the thermal radiation member 12c so that it may straddle the plane part 12f and the inclined surface part 12h. In addition, a pair of rotating arms 12a for rotatably supporting the print head unit 12 is integrally provided at both ends of the heat radiating member 12c.

  Further, the flat cable 17 is disposed along the inner peripheral surface of the heat radiating member 12 c and is connected to a control board (not shown) positioned above the print head unit 12.

  As shown in FIG. 4, the feed roller 14 and the pressing roller 15 rotate in a state where the paper 50 is sandwiched therebetween, thereby feeding the paper 50 in the paper feeding direction (arrow A1 direction) or the paper discharging direction (arrow B1). Direction).

  Further, the paper feed roller 16 has a function of taking the paper 50 placed in a paper feed cassette (not shown) into the printing unit 10.

  As shown in FIGS. 1 and 2, the housing 20 includes a paper feed cassette insertion portion 21 into which a paper feed cassette (not shown) is inserted, and an insertion hole 22 into which the ink sheet cartridge 200 is inserted. , A long hole 23, a sheet guide rib 24, and a heat exhaust hole 25 provided in the inner surface 20 a of the housing 20. A fan cover 40 is attached to the bottom of the housing 20 with screws 43 and 44 so as to contact the inner surface 20a of the housing 20. The fan 30 is attached to the fan cover 40 with screws 41 and 42 so as to face the plurality of slit-like rectangular holes 12i of the heat radiating member 12c.

  Further, as shown in FIG. 2, a paper feed roller 16 is disposed in the vicinity of the inside of the paper feed cassette insertion portion 21. Further, the long hole 23 (see FIG. 1) is provided to escape an end of the paper 50 in the paper feeding direction (arrow A1 direction) at a print start position described later. Further, the paper guide rib 24 has a function of guiding the paper 50 conveyed in the paper feeding direction (arrow A1 direction) to the long hole 23. Further, as shown in FIG. 4, the fan 30 and the exhaust heat hole 25 are disposed in the vicinity of the heat radiating member 12 c of the print head unit 12. The fan 30 has a function of discharging exhaust heat air in the Q direction from the inside of the printing unit 10 to the outside of the housing 20 through the exhaust heat hole 25 by rotating.

  Further, in the present embodiment, the air having heat near the heat radiating member 12c flows in the directions of the arrows P1 and P2, and further, the two airs merge just before the fan 30 and are discharged to the outside. That is, the plurality of slit-shaped rectangular holes 12i communicating with the ink sheet storage portion 202a can generate the air flow P2 from the ink sheet storage portion 202a on the inner peripheral side of the heat dissipation member 12c by the suction of the fan 30. And it is formed in the magnitude | size which can ensure not only the air flow P2 but the air flow P1 from the outer peripheral side of the thermal radiation member 12c. In other words, if the hole 12i is too large, the air flow becomes only P2, so the hole 12i is appropriately sized so that not only the air flow P2 but also P1 can be generated. . Thereby, it is possible to discharge | emit heat outside with sufficient balance from both the inner peripheral side and the outer peripheral side of the heat radiating member 12c.

  FIG. 8 is a cross-sectional view showing a state when the thermal transfer printer according to the embodiment of the present invention is in a print standby state. With reference to FIGS. 4, 5 and 8, the printing operation of the thermal transfer printer according to the embodiment of the present invention will be described.

  As shown in FIG. 8, in the printing unit 10, the paper 50 taken into the printing unit 10 by the paper feeding roller 16 is fed in the paper feeding direction (arrow A1 direction) as the feed roller 14 rotates in the arrow A2 direction. Are conveyed to the printing start position. After that, as shown in FIG. 4, the feed roller 14 rotates in the arrow B2 direction from the print start position, whereby the paper 50 is conveyed in the paper discharge direction (arrow B1 direction). When the paper 50 is conveyed in the paper discharge direction (arrow B1 direction), the paper 50 and the ink sheet 201 are pressed by the print head unit 12 and the platen roller 13, and the print unit 12b of the print head unit 12 generates heat. Is done. Due to this heat generation, the ink on the ink sheet 201 is sublimated and transferred to the paper 50. In this way, printing is performed in the printing unit 10.

  In the present embodiment, as described above, the heat radiating member 12c for radiating the heat of the print head unit 12 is provided in the print unit 12b so as to straddle the ink sheet storage unit 202a, thereby increasing the length of the heat radiating member 12c. Since it can be enlarged, the surface area of the heat radiating member 12c can be further increased accordingly. Thereby, heat dissipation efficiency can be improved more. Further, the heat dissipating member 12c is formed so as to straddle the ink sheet storage portion 202a by disposing a plurality of slit-shaped rectangular holes 12i in a portion of the inclined surface portion 12h of the heat dissipating member 12c facing the fan 30. Even in this case, since the air flow P2 from the inner peripheral side of the heat radiating member 12c to the outside can be formed by the fan 30 through the hole 12i, heat is generated on the inner peripheral side of the heat radiating member 12c. Can be suppressed. That is, in this embodiment, since the air flow P2 from the inner peripheral side of the heat radiating member 12c to the outside can be secured while increasing the surface area of the heat radiating member 12c, the heat radiating efficiency can be further improved. Further, since the air flow P2 from the inner peripheral side of the heat radiating member 12c to the outside can be formed by the fan 30 through the plurality of slit-like rectangular holes 12i, the ink of the ink sheet 201 at the time of printing Foreign matter such as leakage gas due to sublimation and dust that causes printing defects generated on the inner peripheral side of the heat radiating member 12 c can be discharged to the outside of the apparatus main body 100.

  Further, in the present embodiment, a plurality of holes 12i communicating with the ink sheet storage unit 202a are provided, so that a plurality of holes 12i having the same total opening area as that of the one hole are provided compared to the case where one hole is provided. In the case where the hole 12i is provided, the surface area of the inner surface of the hole 12i can be further increased, so that the heat dissipation efficiency can be further improved.

  Further, in the present embodiment, the heat radiating member 12c is attached to the upper surface of the print head unit 12, and a pair of rotating arms 12a for rotatably supporting the print head unit 12 are provided integrally at both ends. By doing so, it is not necessary to provide the rotating arm 12a as a separate part, and thus the increase in the number of parts can be suppressed.

  Further, in the present embodiment, the fan 30 is installed in the vicinity of the portion where the plurality of holes 12i of the heat radiating member 12c are provided, so that the heat dissipated by the heat radiating member 12c can be easily provided by the fan 30. It can be discharged outside the main body 100.

  Further, in the present embodiment, the plurality of holes 12i communicating with the ink sheet storage portion 202a are the air flow P2 from the ink sheet storage portion 202a on the inner peripheral side of the heat dissipation member 12c by the suction of the fan 30 and the outer periphery of the heat dissipation member 12c. By being formed in a size that can ensure both of the air flow P1 from the side, not only the air flow P2 from the ink sheet storage portion 202a on the inner peripheral side of the heat radiating member 12c to the fan 30 is provided. The air flow P1 from the outer peripheral side of the heat radiating member 12c can also be discharged from the apparatus main body 100 in a well-balanced manner from both the inner peripheral side and the outer peripheral side of the heat radiating member 12c. As a result, the heat dissipation efficiency can be further improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and all modifications within the meaning and scope equivalent to the scope of claims for patent are included.

  For example, in the above-described embodiment, a thermal transfer printer is shown as an example of an image forming apparatus. However, the present invention is not limited to this, and any image other than the thermal transfer printer may be used as long as the image forming apparatus has a printing unit that generates heat. It can also be applied to a forming apparatus.

  Moreover, in the said embodiment, although the example which provided the several slit-shaped rectangular hole 12i in the part which opposes the fan 30 of the heat radiating member 12c was shown, this invention is not restricted to this, It shows in FIG. Similar effects can be obtained by providing a plurality of notches 62i in the portion of the heat dissipation member 12c facing the fan 30 as in the modification.

  Moreover, in the said embodiment, although the example which provided the several slit-shaped rectangular hole 12i in the heat radiating member 12c was shown, this invention is not restricted to this, Even if it provides one hole or one notch Good.

1 is an exploded perspective view showing an overall configuration of a thermal transfer printer according to an embodiment of the present invention. FIG. 2 is a perspective view showing an overall configuration of the thermal transfer printer shown in FIG. 1. FIG. 2 is a perspective view showing a case where only a print portion of the thermal transfer printer shown in FIG. 1 is viewed from another direction. It is sectional drawing which showed the state at the time of printing operation of the thermal transfer printer by one Embodiment of this invention. FIG. 5 is a cross-sectional view of the thermal transfer printer shown in FIG. 4 taken along line 300-300. It is the perspective view which showed the heat radiating member of the thermal transfer printer by one Embodiment of this invention. It is a top view of the heat radiating member of FIG. It is sectional drawing which showed the state at the time of the printing standby of the thermal transfer printer by one Embodiment of this invention. It is the perspective view which showed the heat radiating member by the modification of the thermal transfer printer by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Print part 12 Print head part 12a Rotating arm 12c Heat radiating member 12i Hole 20 Case 30 Fan 62i Notch 100 Main body 200 Ink sheet cartridge 201 Ink sheet 202a, 202b Ink sheet storage part P1, P2 Air flow

Claims (6)

An apparatus main body including a print head unit; an ink sheet cartridge that is detachably attached to the apparatus main body and has an ink sheet storage unit for storing an ink sheet; and provided in the apparatus main body, and that heats the print head unit. In an image forming apparatus provided with a fan for discharging to the outside,
Dissipating heat to dissipate heat from the print head unit, which is provided in the print head unit so as to straddle the ink sheet storage unit, and has a hole or notch communicating with the ink sheet storage unit in a portion facing the fan. Further comprising a member,
A plurality of the holes or notches leading to the ink sheet storage unit are provided,
The heat dissipating member is attached to the upper surface of the print head part, and a pair of rotating arms for rotatably supporting the print head part are provided at both ends,
The fan is installed in the vicinity of a portion of the heat dissipation member provided with the hole or notch,
The holes or cutouts leading to the ink sheet storage portion are formed by the flow of air from the ink sheet storage portion on the inner peripheral side of the heat dissipation member and the air flow from the outer peripheral side of the heat dissipation member by suction of the fan. An image forming apparatus that is formed in a size that can secure both. An apparatus main body including a print head unit;
An ink sheet cartridge that is detachably attached to the apparatus main body and has an ink sheet storage portion in which an ink sheet is stored;
A fan provided in the apparatus main body for discharging heat of the print head unit to the outside;
Dissipating heat to dissipate heat from the print head unit, which is provided in the print head unit so as to straddle the ink sheet storage unit, and has a hole or notch communicating with the ink sheet storage unit in a portion facing the fan. An image forming apparatus comprising a member.   The image forming apparatus according to claim 2, wherein a plurality of the holes or notches communicating with the ink sheet storage unit are provided.   The heat radiating member is attached to the upper surface of the print head portion, and a pair of rotating arms for rotatably supporting the print head portion are provided at both ends integrally. The image forming apparatus described.   5. The image forming apparatus according to claim 2, wherein the fan is installed near a portion of the heat radiating member where the hole or notch is provided.   The holes or cutouts leading to the ink sheet storage portion are formed by the flow of air from the ink sheet storage portion on the inner peripheral side of the heat dissipation member and the air flow from the outer peripheral side of the heat dissipation member by suction of the fan. The image forming apparatus according to claim 2, wherein the image forming apparatus is formed in a size capable of securing both.

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