JPH0528653U - Thermal head support mechanism - Google Patents

Abstract

(57) [Summary] The present invention relates to a support mechanism for a thermal head. [PROBLEMS] To provide a support mechanism of a thermal head that uniformly presses a head and a platen to improve print quality. [Structure] A protrusion is provided at the center of a head holder 3, and a head 4 is fixed to the head holder 3 by using a spacer 4 between the head holder 3 and the thermal head 2. As a result, even if the head 2 and the platen 1 are mounted in an inclined manner due to variations in component accuracy, the thermal head 2 moves with the protrusion of the head holder 3 as a fulcrum and is uniformly pressed by the platen, resulting in uniform print quality. Is secured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermal head support mechanism.

[0002]

[Prior Art]

 A thermal printer presses a thermal head (hereinafter abbreviated as a head) for printing on a platen with a predetermined pressure, and a desired printing is performed on a recording paper by heat generated from the pressure and the electric energy applied to the head. When not printing, the system is separated from the platen to prevent deformation of the platen. As shown in FIG. 3, a platen and a head holder holding the head are rotatably attached to the frame by a shaft. A mechanism is provided that uses an elastic body to press the head toward the platen side to press it, and uses a lever or the like to separate the head from the platen. However, if the parallelism between the platen and the axis deviates even a little due to variations in component accuracy, the head and platen will cause one-sided contact as shown in Fig. 2 and optimum printing pressure cannot be obtained, which will cause deterioration of print quality. .

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide a head support mechanism for a thermal printer, which allows the head and the platen to come into uniform contact with each other to improve printing quality.

[0004]

[Means for solving the problem]

 The purpose of the present invention to achieve the above object is to provide a protrusion at the center of the head holder that holds the head, and use a spacer between the head holder and the head to lift the head from the head holder. It is characterized by holding.

[0005]

[Action]

 According to the present invention, even if the platen and the head are partially contacted with each other due to the variation in the dimensional accuracy of the parts, the head moves naturally around the center of the head as a fulcrum and is uniformly pressed to the platen, which ensures high quality. Can print.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are sectional views of the main part of the present invention. A platen 1 and a head holder 3 holding a head 2 are rotatably supported by a shaft (not shown) on a frame (not shown) of the printer. The head 2 is fixed to each of the two elongated holes provided in the head holder with a screw via a spacer. FIG. 1A shows a state in which the head 2 and the platen 1 are separated from each other during non-printing, and the head 2 is held by the head holder 3 so as to be suspended. FIG. 1 (b) shows a state in which the head 2 is pressed against the platen 1 at the time of printing, and the head 2 and the platen 1 are tilted due to the deviation of the parts accuracy of the head frame 3 and the frame (not shown). It shows the operation when it is attached. The operation of the head 2 will be described. By pressing the head holder 3 to the platen side using an elastic body, the protrusion provided on the head holder 3 presses the central part of the head 2 and presses the head 2 to the platen 1. There is. When the head 2 and the platen 1 are mounted in a tilted manner, the head 2 is pushed toward the platen side by the protrusion of the head holder 3 and oscillated to the left or right within a certain range by the long hole provided in the head holder 3. The head 2 can be moved, and the head 2 can be uniformly pressed along the platen 1 with the protrusion of the head holder 3 as a fulcrum.

[0007]

[Effect of the device]

 According to the present invention, uniform pressure contact with the platen roller of the thermal head without uneven contact can be performed without adjustment, and thus uniform printing can be performed.

[Brief description of drawings]

1 (a) and 1 (b) are cross-sectional views of main parts in an embodiment of the present invention.

FIG. 2 is a diagram showing a state where a head and a platen are partially contacted with each other.

FIG. 3 is a view showing a conventional thermal head support mechanism.

[Explanation of symbols]

 1 Platen roller 2 Thermal head 3 Head holder 4 Spacer

Claims (1)

[Scope of utility model registration request] In a head supporting mechanism of a line thermal head, a head holder holding the line thermal head is provided with a protrusion, and the thermal head is rotatably held with the protrusion as a fulcrum. Support mechanism.