JPH04100865U - Printing gap adjustment device for printing device - Google Patents

Abstract

(57) [Summary] [Purpose] To make it possible to obtain a printing gap corresponding to the thickness of the medium at the printing position even if the medium thickness detection position is far from the printing position. [Structure] When the medium 10 is conveyed between the roller 5 and the medium thickness detection roller 1, the displacement sensor 6 detects the displacement of the roller support member 3 as the thickness of the medium 10, and temporarily stores it in the memory circuit 7 as data. After that, when the medium 10 whose thickness is stored in the memory circuit 7 is conveyed to the printing position, the motor of the platen drive unit 15 operates according to the thickness of the medium based on the memory in the memory circuit 7. Platen 8
to ensure an appropriate gap with the print head 9.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a printing gap adjustment device for a printing device, and is particularly applicable to media with uneven thickness. Printing device that ensures proper printing gap between the print head and platen when printing The present invention relates to a printing gap adjustment device for a machine.

0002

[Conventional technology]

In general, a printing device transports a printing medium 10, for example, as shown in FIG. The conveyed printing medium 10 is supported on the platen 8, and the printing medium 10 is opposed to the platen 8. The print head 9 is configured to print on the print medium 10.

0003 In such a printing device, the conventional printing gap adjustment device is as shown in Fig. 2. The medium thickness detection roller 1, which is supported by the shaft 2 on the roller support member 3, is connected to the medium 10. The roller 5 is pressed against the roller 5, and the roller support member 3 is supported by the spring 4 to release the medium. It is movable according to the thickness of the body 10 and supports the medium thickness detection roller 1. A photo sensor 12 for position detection is provided on the roller support member 3 and connected to the platen 8. The platen 8 is connected to a motor (not shown) until the light shielding plate 13 shields the photosensor 12 from light. By moving the print head 9 and the platen 8 properly, The gap was secured.

0004

[Problem that the idea aims to solve]

However, in the printing gap adjustment device of this conventional printing device, the media The print position where the print head 9 is located relative to the medium thickness detection position where the thickness detection roller 1 is located For example, it is difficult to print on a medium 10 with a non-uniform thickness to which a sticker 11 is affixed. When printing, there is a problem that the printing position does not necessarily have the appropriate gap. Ta.

[0005] In addition, since the platen 8 is operated until the photosensor 12 is shielded from light, The media thickness is detected only at a certain predetermined position, and it cannot respond to changes in media thickness. There was also the problem of not being able to do so.

[0006] This invention was devised in view of the above problems, and the media thickness detection position is at the printing position. Even if you are far away from the printer, you can obtain a print gap that corresponds to the thickness of the media at the print position. The purpose of the present invention is to provide a printing gap adjustment device for printing devices that enables .

[0007]

[Means to solve the problem]

In order to achieve the above purpose, the printing gap adjustment device of the printing device of the present invention is designed to A mark on the printing device that adjusts the distance between the print head and the platen through which the print media passes. In the character gap adjustment device, it comes into contact with the printing medium being conveyed and adjusts the thickness of the printing medium. A media thickness detection roller that displaces accordingly, and a displacement sensor that detects the displacement of the media thickness detection roller. sensor, a memory circuit that stores the detection results of the displacement sensor, and a media thickness detection position. When the detected medium reaches the printing position, based on the detection result stored in the memory circuit. A structure equipped with a platen drive unit that displaces the platen and changes the distance between it and the print head. As a result.

[0008]

[Effect]

According to the printing gap adjustment device of the printing device having the above configuration, the media thickness detection section The media thickness detection data by the displacement sensor is stored and retained in the memory circuit. Based on the data detected at the media thickness detection position, when the media detected at the media thickness detection position reaches the printing position, The platen is operated according to the media thickness to obtain the appropriate printing gap.

[0009]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows the actual implementation of this invention. FIG. 2 is a side view showing a printing gap adjustment device of a printing device according to an example.

0010 The printing device to which this embodiment is applied, similarly to the above, prints the transported printing medium 10. The print head 9 is supported by the platen 8 and is opposed to the platen 8. Printing is performed on the medium 10.

[0011] In the figure, reference numeral 1 denotes a medium thickness detection roller, and a shaft 2 is attached to a roller support member 3. It is pivoted through. This roller support member 3 is supported by a spring 4, and The recording medium thickness detection roller 1 is brought into elastic contact with the fixed roller 5, and the recording medium is passed between the rollers 1 and 5. It can be displaced depending on the thickness of the printing medium 10.

0012 Reference numeral 6 denotes a displacement sensor, which is composed of, for example, a magnetoresistive element, and is connected to the roller support member 3. It is attached to the media thickness detection roller 1 to detect the displacement of the medium thickness detection roller 1.

[0013] A memory circuit 7 stores the detection results of the displacement sensor 6.

[0014] 15 is a platen drive unit, which operates based on the detection results stored in the memory circuit 7. The platen 8 is moved to change the distance between the platen 8 and the print head 9, and the media thickness can be inspected. When the medium detected at the printing position reaches the printing position, the platen 8 is moved according to the thickness of the medium. Activate.

[0015] Therefore, according to the printing gap adjustment device according to this embodiment, the roller 5 and the medium When the medium 10 is conveyed between the body thickness detection roller 1, the thickness of the medium 10 is determined by the roller. A displacement sensor (magneto-resistance element) 6 detects the displacement of the support member 3 and integrates it as data. The data is then stored in the memory circuit 7.

[0016] Thereafter, the medium 10 whose thickness is stored in the memory circuit 7 is conveyed to the printing position. When this happens, a motor (not shown) of the platen drive unit 15 moves the media depending on the thickness of the medium. The platen 8 is operated to ensure an appropriate gap with the print head 9 and print is performed.

[0017] As a result, even if the sticker 11 is pasted on the back side of the medium 10, the sticker This means that it is possible to secure a gap that corresponds to the thickness of the roll.

[0018]

[Effect of the idea]

As explained above, according to the printing gap adjustment device of the printing device of the present invention, the medium A displacement sensor is installed at the body thickness detection position, and the media thickness detection data from this displacement sensor is unified. By memorizing it once, the media thickness detection position can be printed when printing on media with uneven thickness. The print head and printer are compatible with the thickness of the media at the print position, even if you are far from the print position. This has the effect of ensuring an appropriate gap between Latin people.

[Brief explanation of drawings]

FIG. 1 is a side view showing a printing gap adjustment device of a printing device according to an embodiment of the present invention.

FIG. 2 is a side view showing a printing gap adjustment device of a conventional printing device.

[Explanation of symbols]

1 Media thickness detection roller 2 shaft 3 Roller support member 4 Spring 5 roller 6 Displacement sensor (magnetoresistive element) 7 Memory circuit 8 Platen 9 Print head 10 Medium 11 Seal 12 Photo sensor 13 Light shielding plate 15 Platen drive section

Claims (1)

[Scope of utility model registration request] Claim 1: In a printing gap adjustment device of a printing device that adjusts the distance between a print head and a platen through which a printing medium to be conveyed passes, a device that comes into contact with the printing medium to be conveyed and is displaced according to the thickness of the printing medium. A displacement sensor that detects the displacement of the media thickness detection roller, a memory circuit that stores the detection results of the displacement sensor, and a memory circuit that detects the media when the media detected at the media thickness detection position reaches the printing position. Displace the platen based on the memorized detection results,
A printing gap adjustment device for a printing device, comprising a platen drive unit that changes the distance between the printing head and the printing head.