JPH0556440U - Thermal printer - Google Patents

Abstract

(57) [Summary] [Purpose] While being able to reduce the size of the structure,
It is an object of the present invention to provide a heat-sensitive printing device that can improve reliability. [Structure] In a heat dissipation plate 24 of a thermal head 25, an engaging projection 41 of an attachment member 32 is inserted into an engaging recess 40 of the thermal head 25 from one end in a longitudinal direction, and sandwiching portions 45 and 46 are engaged with the engaging projection 41.
Both are fixed to each other by sandwiching the neck portion 43 of the.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a thermal printing apparatus such as a thermal printer head that generates heat to perform thermal printing.

[0002]

[Prior Art]

 FIG. 5 is a sectional view of a typical conventional thermal printer 1, and FIG. 6 is a bottom view of the thermal printer 1. The thermal printer 1 includes a thermal insulating plate 2 made of an electrically insulating material such as ceramic, and a heat radiating plate 4 obtained by processing a metal such as aluminum to which the insulating substrate 2 is fixed via an adhesive layer 3. A head 5 is provided. A large number of heating elements 6 are linearly arranged on the insulating substrate 2 in a direction perpendicular to the plane of FIG. The drive circuit element 7 that individually drives the heating elements 6 to generate heat corresponding to the print data is covered with a protective film 8.

On the other hand, an external wiring board 10 for inputting printing data and various control signals from the outside to the insulating board 2 via a connector 9 is fixed on the heat dissipation plate 4. A range from the external wiring board 10 to the drive circuit element 7 is covered with a head cover 11. A plurality of screw holes 12 having a depth d1 are formed on the end surface of the heat dissipation plate 4 opposite to the insulating substrate 2. The heat radiating plate 4 is fixed to a mounting member 13 for mounting the thermal head 5 on an unillustrated machine frame of the thermal printer 1 so as to be angularly displaceable. Insertion holes 14 are formed in the mounting member 13 at positions corresponding to the screw holes 12, and screws 15 are screwed into the screw holes 12 through the insertion holes 14 to attach the thermal head 5 to the mounting member 13. Fixed. A platen roller 16 is in contact with the heating element 6, and a thermosensitive recording paper 17 is sandwiched between them to perform thermosensitive printing.

[0004]

[Problems to be solved by the device]

 In the conventional thermal printer 1, the thermal head 5 is mounted on the mounting member 13 using the screw 15. Therefore, it is necessary to form a plurality of screw holes 12 in the heat dissipation plate 4, as shown in FIG. 5 and FIG. 7 which is an enlarged sectional view thereof. Since it is necessary to mount the thermal head 5 on the mounting member 13 with sufficient strength, it is difficult to reduce the depth d1 and the effective length d2 of the screw hole 12, and thus the thickness of the heat sink 4 cannot be suppressed. However, there is a problem that it is difficult to reduce the size of the thermal head 5. In addition, the head of the screw 15 may protrude on the side of the mounting member 13 opposite to the thermal head 5, which may collide with other components of the thermal printer 1, resulting in reduced reliability. There is a problem of doing. Further, the heat dissipation plate 4 is formed by processing aluminum having relatively plasticity, and has a problem that the screw hole 12 is easily crushed when the screw hole 12 is formed and used.

An object of the present invention is to solve the above-mentioned technical problems and to provide a thermal printing apparatus which can be downsized and whose reliability is significantly improved.

[0006]

[Means for Solving the Problems]

 The present invention relates to a heat radiation printing apparatus comprising a wiring board, in which a plurality of printing elements that generate heat to perform heat sensitive printing are linearly arranged, and is attached to a mounting member via a heat radiation member. The heat-sensitive printing apparatus is characterized in that the heat dissipating member is attached to the mounting member by providing a place and inserting a protrusion formed on the mounting member into the recess.

[0007]

[Action]

 In the thermal printing apparatus according to the present invention, a wiring board on which a plurality of printing elements that generate heat to perform thermal printing are linearly arranged is fixed to one end surface of the heat dissipation member. The heat radiating member is formed with an engaging recess opening at an end opposite to the one end face and at least one end along the longitudinal direction of the heat radiating member. It is formed in a shape corresponding to the fitting recess. The engaging protrusion of the mounting member is inserted into the engaging recess from one end portion of the heat dissipation member along the longitudinal direction, and the mounting member is fixed to the heat dissipation member.

That is, the present invention eliminates the need to form a screw hole into which a fixing screw is screwed in the heat radiating member as in the prior art, and reduces the thickness of the heat radiating member as much as possible. Can be promoted. In addition, the situation in which the head of the fixing screw projects from the mounting member is prevented, and this causes the projecting part of the screw to contact other components and cause a failure, resulting in a decrease in reliability. Can be prevented.

[0009]

【Example】

 FIG. 1 is a sectional view of a thermal printer 21 according to an embodiment of the present invention, FIG. 2 is a front view of the thermal printer 21 in use, and FIG. 3 is a right side view of the thermal printer 21. The thermal printer 21 is an insulating substrate 22 made of an electrically insulating material such as ceramic, and a heat radiating plate which is the heat radiating member obtained by processing a metal such as aluminum to which the insulating substrate 22 is fixed via an adhesive layer 23. And a thermal head 25 including 24. A large number of heating elements 26 are linearly arranged on the insulating substrate 22 in a direction perpendicular to the plane of FIG. The drive circuit element 27 that individually drives the heating elements 26 to generate heat corresponding to the print data is covered with a protective film 28.

On the other hand, an external wiring board 30 for inputting print data and various control signals to the insulating board 22 from the outside via a connector 29 is fixed on the heat dissipation plate 24. A range from the external wiring board 30 to the drive circuit element 27 is covered with a head cover 31.

The heat dissipation plate 24 is integrally fixed to a mounting member 32 formed by processing a metal material such as aluminum, for example, by a structure described later. The mounting member 32 mounts the thermal head 25 on an unillustrated machine frame of the thermal printer 21 so as to be angularly displaceable around the pivot 33, and the thermal head 25 has one end fixed to the mounting member 32 on the side opposite to the thermal head 25. It is configured to be pressed against the platen roller 35 by the spring force of the pressing spring 34. That is, the heat-sensitive recording paper 36 is nipped between the platen roller 35 and the heat-sensitive printing.

FIG. 4 is a front view of the heat dissipation plate 24. Please also refer to FIG. The heat radiating plate 24 is formed with an engaging hole 38 penetrating through the heat radiating plate 24 in the longitudinal direction and forming a box-shaped inner peripheral surface having a length T1 and a width W1. On the side opposite to the place 37, it is communicated with the outside through an engaging groove 39 formed on the mounting member 32 side over the entire length in the longitudinal direction of the heat dissipation plate 24. The engaging groove 39 has a width W2 smaller than the width W1 of the engaging hole 38, and forms an engaging recess 40 including the engaging hole 38 and the engaging groove 39 with which the mounting member 32 engages. Further, a pair of holding portions 45 and 46 which are formed by forming the engagement groove 39 and which hold a neck portion 43 of the mounting member 32, which will be described later, are formed.

The mounting member 32 integrally has an engaging projection 41 having a shape corresponding to the engaging recess 40. That is, the mounting member 32 has a width W4 larger than the width W3 shown in FIG. 4 of the heat dissipation plate 24, and has a rectangular plate-shaped base 42 having a length of at least the entire length of the heat dissipation plate 24. A neck portion 43 having a width W4 equal to or slightly smaller than the width W2 of the engaging groove 39 and equal to or slightly higher than the height T2 of the engaging groove 39, and the width W2 of the engaging groove 39. The width W5 is substantially equal to or slightly smaller than the width W1 of the engagement hole 38, and has a thickness t1 equal to or slightly smaller than the height T1 of the engagement hole 38, and has a length of about the entire length of the heat dissipation plate 24. And a rectangular plate-shaped engaging portion 44 having. The base portion 42, the neck member 43 and the engaging portion 44 constitute the engaging convex portion 41.

The mounting member 32 preferably radiates the heat generated by the heating element 26 to the mounting member 32 through the insulating substrate 22 and the heat dissipation plate 24, so that the engaging convex portion of the mounting member 32 is preferable. 41 is in close contact with the inner peripheral surface of the engaging recess 40, and the base portion 42 of the mounting member 32 is also in close contact with the end surface of the heat dissipation plate 24 on the side of the mounting member 32 to form a shape. After mounting the heat dissipation plate 24 on the mounting member 32, in order to prevent the heat dissipation plate 24 from undesirably displacing with respect to the mounting member 32 in the longitudinal direction, after combining the two, both ends in the longitudinal direction are combined. Apply adhesive to secure each other.

To assemble the thermal printer 21 in this embodiment, the adhesive layer 23 is applied on the heat dissipation plate 24, the insulating substrate 22 and the external wiring substrate 30 are fixed, and the head cover 31 is attached thereon. In the thermal head 25 constructed in this way, one end of the mounting member 32 is attached to the body frame (not shown) of the thermal printer 21 via the pivot 33 so as to be angularly displaceable. It is inserted into the place 40 from one end in the longitudinal direction, and as described above, both ends in the longitudinal direction are coated with an adhesive and fixed to each other.

In this way, in the thermal printer 21 of this embodiment, when the heat dissipation plate 24 of the thermal head 25 is mounted on the mounting member 32, the screwing work as described in the section of the prior art is unnecessary, The screw hole in the heat dissipation plate 24 becomes unnecessary. Therefore, the thickness of the heat dissipation plate 24 can be remarkably reduced as compared with the conventional one, and the thermal head 25, and hence the thermal printer 21, can be downsized. Further, in the present embodiment, since the screw is not used unlike the conventional example, the situation in which the head of the screw projects from the side opposite to the thermal head 25 of the mounting member 32 is prevented, and other components included in the thermal printer 21. It is possible to prevent the collision with and improve the reliability significantly.

Further, although the heat dissipation plate 24 is formed by processing aluminum having relatively plasticity, it does not have the screw hole as described in the prior art. Therefore, the screw hole is crushed and the reliability is improved. Can be prevented from falling. In this embodiment, since the sandwiching portions 45 and 46 are formed in the heat dissipation plate 24, it is possible to prevent the thermal head 25 from coming off the mounting member 32.

In this embodiment, the heat dissipation member is formed with the engagement recess and the mounting member is formed with the engagement projection. However, conversely, the heat dissipation member is formed with the engagement projection. The engaging recess may be formed in the mounting member.

[0019]

[Effect of the device]

 As described above, according to the present invention, the heat dissipating member has an engaging recess that is open at one end surface to which the wiring board is fixed, the opposite end, and at least one end along the longitudinal direction of the heat dissipating member. Is formed, and the engagement protrusion of the drive member is formed in a shape corresponding to the engagement recess. The engaging projection of the driving member is inserted into the engaging recess from one end portion of the heat dissipation member along the longitudinal direction, and the driving member is fixed to the heat dissipation member.

That is, the present invention eliminates the need to form a screw hole into which a fixing screw is screwed in the heat dissipation member as in the prior art, and reduces the plate thickness of the heat dissipation member as much as possible. Can be promoted. In addition, the situation in which the head of the fixing screw projects from the drive member is prevented, which causes the projecting part of the screw to contact other components and cause a failure, which reduces reliability. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a thermal printer 21 according to an embodiment of the present invention.

FIG. 2 is a front view illustrating a usage state of the thermal printer 21 according to the present embodiment.

FIG. 3 is a perspective view of a thermal printer 21.

FIG. 4 is a front view of a heat dissipation plate 24.

FIG. 5 is a sectional view of a conventional thermal printer 1.

FIG. 6 is a bottom view of the thermal printer 1.

FIG. 7 is an enlarged cross-sectional view of a heat dissipation plate 4.

[Explanation of symbols]

 21 thermal printer 22 insulating substrate 24 heat sink 25 thermal head 32 mounting member 40 engaging recess 41 engaging protrusion

Claims (1)

[Scope of utility model registration request] 1. A heat radiation printing apparatus comprising a wiring board, in which a plurality of printing elements that generate heat for heat-sensitive printing are linearly arranged, and is attached to a mounting member via a heat radiation member. A heat-sensitive printing apparatus characterized in that a heat dissipation member is attached to a mounting member by providing a recess and inserting a protrusion formed in the mounting member into the recess.