KR19990010939U - Thermal Transfer Head and Paper Adhering Device in Image Forming Device Using Thermal Transfer Method - Google Patents

Abstract

The present invention relates to a thermal transfer head and a paper adhesion device of an image forming apparatus using a thermal transfer method, wherein the heating element of the thermal transfer head and the paper or film are always kept in close contact with each other so that the head can be transported at the same time. The first and second platen rollers connected by a belt to the center are spaced apart from both sides.

Description

Thermal Transfer Head and Paper Adhering Device in Image Forming Device Using Thermal Transfer Method

The present invention relates to an image forming apparatus using a thermal transfer method, and more particularly, to an adhesive apparatus for conveying a paper and a film in contact with a thermal print head.

Conventionally, as shown in Fig. 1, a schematic diagram showing a configuration of an image forming apparatus using a heat source of a thermal transfer head, in which the cassette 100, on which a plurality of sheets of paper 102 are stacked, is provided on one side. Then, a pickup roller 104 for feeding the recording paper 102 is provided at one upper end of the cassette 100.

On one side of the pickup roller 104, the guide 106 for guiding the recording paper to be fed to the conveying roller 108 is installed to be inclined downward. On one side of the guide 106, a feed roller 108 for feeding the recording paper fed by the pickup roller to the thermal transfer head 118 side is provided to be engaged with each other. One side of the feed roller 108 is provided with a feed sensor 110 for inputting the image signal to the thermal transfer head side when the tip of the recording paper reaches the thermal transfer head 118. One side of the feed sensor 110 is provided with a driving unit 112, 114 for driving a film which is a medium for forming an image on the recording sheet. At this time, the film is wound around the driving unit 112, and the film formed on the recording paper is wound on the other driving unit 114.

A thermal transfer head 118 is formed between the two driving units 112 and 114 to generate high temperature heat to form an image on the recording paper. At the upper end of the thermal transfer head 118, a platen roller 122 for transferring recording paper while contacting the head is provided. On the lower surface of the thermal transfer head 118, a spring 124 for pressing the film and the recording paper into close contact with a predetermined pressure is installed while being supported by the frame 120.

At this time, the problems in accordance with the coupling state of the thermal transfer head and the platen roller with reference to Figure 2 as follows.

The heating element (protrusion) of the thermal transfer head 118 and the platen roller 122 should be in contact with each other within 100 μm to proceed with the printing process. Printing process within this range could produce a good image. Therefore, a precise jig that can be fixed and assembled by positioning the heating element of the thermal transfer head 118 and the platen roller 122 is required. .

For the same reason as above, if the contact position between the thermal head 118 and the heating element and the platen roller 122 is not within 100 μm, it is necessary to provide a fatal effect on the image and to position it essentially within this range, so that a precise jig is required. As such, this setting process requires as much processing. These general points reduce productivity when assembling the product.

The present invention has been made in order to solve the above-mentioned conventional problems, the object of the present invention in the process of assembling the thermal transfer head and the platen roller with each other, the thermal transfer development method pursuing the improvement of productivity by eliminating the assembly process Provided is a thermal transfer head and a paper adhesion device in an image forming apparatus.

In order to achieve the above objects, the present invention provides the first and second platens connected by a belt about the head so that the heating element of the thermal transfer head and the paper or film are always in close contact with each other and can be transported at the same time. The rollers are spaced apart on both sides.

1 is a configuration diagram schematically showing an image forming apparatus using a thermal transfer method according to an exemplary embodiment.

Figure 2 is a perspective view showing a state in which the thermal transfer head and the platen roller are coupled according to an embodiment

3 is a schematic view showing an image forming apparatus using a thermal transfer method according to an embodiment of the present invention;

Figure 4 is a perspective view showing the installation state of the thermal transfer head and the platen roller according to an embodiment of the present invention

Explanation of symbols for main parts of the drawings

10,20: 1st, 1, 2 platen roller 100: paper feed cassette

112, 114: drive unit 118: thermal transfer head

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a configuration diagram schematically showing an image forming apparatus using a thermal transfer developing method according to an exemplary embodiment of the present invention, and FIG. 4 is a perspective view illustrating a mounting state between a thermal transfer head and a platen roller. Referring to the drawings,

In the image forming apparatus using the thermal transfer method of the present invention, a cassette 100 in which a plurality of sheets are stacked is installed on one side. Then, a pickup roller 104 for feeding the recording paper 102 is provided at one upper end of the cassette 100.

On one side of the pickup roller 104, a guide 106 for guiding the recording paper 102 to be fed to the conveying roller 108 is installed to be inclined downward. On one side of the guide 106, a feed roller 108 for feeding the recording paper fed by the pickup roller to the thermal transfer head 118 side is provided to be engaged with each other. One side of the feed roller 108 is provided with a feed sensor 110 for inputting the image signal to the thermal transfer head 118 side when the tip of the recording paper reaches the thermal transfer head 118. One side of the feed sensor 110 is provided with a driving unit 112, 114 for driving a film which is a medium for forming an image on the recording sheet. At this time, the film is wound around the driving unit 112, and the film formed on the recording paper is wound on the other driving unit 114.

A thermal transfer head 118 is formed between the two driving units 112 and 114 to generate high temperature heat to form an image on the recording paper. First and second platen rollers 10 and 20 are provided at the upper end of the thermal transfer head to transfer recording paper while contacting the head. The lower surface of the thermal transfer head 118 is provided with a spring 124 to press the film and the recording paper to be in close contact with a certain pressure.

The first platen roller 10 and the second platen roller 20 are installed at both sides with respect to the thermal transfer head 118, and the power is connected by the belt 30. That is, when the first platen roller 10 rotates, the second platen roller 20 rotates by the belt 30, and one side of the rotating belt 30 maintains contact with the heat generating portion of the thermal transfer head 118 with a uniform force. do. That is, the close contact with the flexibility of the belt 30 is always maintained. This improves the image quality.

The two platen rollers 10 and 20 rotate in the same direction by the driving unit, and the paper and the film are brought into close contact with the heat generating unit of the thermal transfer head 118 by the driving force of the roller to perform the printing process. That is, the two rollers 10 and 20 provide a force to keep the paper and the film in close contact with the heat generating unit at all times, and simultaneously transfer the paper and the film by the frictional force.

Further, the contact force between the heating element of the thermal transfer head 118 and the paper and the film is set in consideration of the distance between the rollers 10 and 20. That is, the distance between the rollers 10 and 20 can be adjusted. In addition, a bearing not shown in the drawing is installed at one end of the driving unit of the rollers 10 and 20.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

As discussed above, the present invention eliminates the alignment process of the thermal transfer head and the platen roller, eliminates the need for a precise jig, and prevents image defects due to poor contact. Moreover, it provides a fundamental solution to the contact failure.

Claims (1)

In the image forming apparatus using the thermal transfer method, The first and second platen rollers connected by belts are installed on both sides of the head to be spaced apart from each other so that the heating element of the thermal transfer head and the paper or film are always in close contact with each other. Thermal transfer head and the paper adhesion device in the image forming apparatus using a thermal transfer method.