JPH0411795Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a print head positioning device used as a printing device such as an electronic printer.

[Prior art]

Generally, in conventional electronic printers, the surface of the platen (paper feed support), which is a long plate that spans both sides of the printer, is parallel to the surface where the printing element of the thermal head is installed. By positioning the paper so that it becomes , uneven printing on the paper fed to the platen is prevented.

Therefore, it is necessary to provide position adjustment means for positioning the platen on both sides of the conventional electronic printer, which results in a complicated structure, time-consuming adjustment, and high cost. It was hot.

[Purpose of the present invention] The present invention was made to solve the above-mentioned problems, and its purpose is to make the thermal head follow the flat surface of the platen, even when the platen is fixed. Achieving reliable printing on paper that eliminates printing irregularities, and eliminating position adjustment means with complicated and large structures, making efficient use of space and reducing product costs.
Another object of the present invention is to provide a print head positioning device that can eliminate ink from adhering to the head mounting frame and its shaft, thereby improving the durability of the printer.

[Summary of the invention]

In order to achieve the above object, the present invention provides a printing thermal head that is rotatably mounted on a head mounting frame so that the printing element part of the thermal head can follow the flat surface of the platen, so that the thermal head is always connected to the platen. The paper is characterized in that it is configured to be angularly displaced so as to be in close contact with the surface of the paper, so that printing on the fed paper can be reliably performed.

[Example of the present invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 4 show an example in which the present invention is used in an electronic printer, where 1 is an electronic printer. The electronic printer 1 includes a keyboard section 2, a case 3, a display section 4, and a ribbon cartridge 5.
a printing section 6 to which is attached, a paper feed section 7 for supplying paper A to the printing section 6, and a transparent lid body 8 that covers the printing section 6.
It is roughly composed of. The ribbon cartridge 5 is configured to be placed on a mounting table 5a that is reciprocated in the horizontal direction by a belt 9, and a printing unit 6 is operated on the ink ribbon 20 to feed the ink ribbon 20 to the platen 10 through a paper feed unit 7. The setting is such that printing can be performed on the supplied paper A. That is, the printing unit 6 includes a head mounting frame 13 that presses the thermal head 11 in the direction of the flat surface 10a of the platen 10 whose both ends are fixed on both sides of the electronic printer 1;
A head cover 1 is rotatably held at the upper end of the head adhesion frame 13 by a shaft 14.
2 and a thermal head 11 integrally attached to the head cover 12.

A printing element section 15 consisting of a heating element is provided on the front surface of the thermal head 11 on the platen side.
A printing element section 15 is located on the lower side of the thermal head 11.
A flexible substrate 16 is attached to supply current to.

Further, the head mounting frame 13 described above is
A free end side 13a that is formed to have a substantially L-shaped cross section and stands upright.
a head cover 12 having a thermal head 11 on it;
is rotatably mounted, and its intermediate portion 13b is formed as a shaft portion and is pivotally attached to the shaft 17 so as to be rotatable and slidable in the horizontal direction.
One free end side is formed of a protruding piece 13c that can be pushed up by a pulling member 18 pulled up by a solenoid or the like (not shown).

That is, the head mounting frame 13 rotates about the shaft 17, and the thermal head 11
presses the paper A supplied to the platen 10,
Paper A is placed between the platen 10 and the thermal head 11.
are sandwiched together, and at this time, the printing element portion 15 of the thermal head 11 prints on the paper A via the ink ribbon 20. In addition, since the thermal head 11 itself is rotatably attached to the head mounting frame 13, the platen 11
Even if the platen 10 is slightly warped or fixed at an angle, the flat surface 10a of the platen 10
The thermal head 11 rotates appropriately following the
The printing element section 15 and the flat surface 10a are set to be in close contact with each other via the paper A and the ink ribbon 20.

It is preferable that the thermal head 11 is disposed on the head cover 12 so that the center of the printing element portion 15 is located at the axis of the shaft 14, as shown in FIG.

Since the present invention is configured as described above,
Even if the platen 10 is fixed on both sides of the electronic printer 1, the thermal head 11 follows the flat surface 10a of the platen 10 and is rotated, so that the paper A fed to the platen 10 is connected to the platen 10 and the thermal head. The printing element portion 15 of the thermal head 11 reliably prints on the paper A via the ink ribbon 20.

It should be noted that the present invention is not limited to one embodiment, but can of course be applied to facsimiles, line printers, electronic printers that do not use ribbon cassettes, and the like.

[Effects of this invention]

As is clear from the above configuration, according to the present invention, the thermal head side, which is much smaller than the platen and has a shorter width, can be rotated to follow the flat surface of the platen, thereby making it possible to position the thermal head on the platen. Of course, since the head cover covers the head mounting frame, even if the printer is used continuously, the head mounting frame and the shaft of the frame will not be contaminated by ink melting or scattering. can improve the durability of

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to an electronic printer. FIG. 2 is a perspective view showing a ribbon cartridge attached to the thermal head of the present invention. FIG. 3 is an exploded perspective view showing the main parts of the present invention. FIG. 4 is a perspective view showing the installed state of the thermal head of the present invention. 1...Electronic printer (printer), 2...Keyboard section, 3...Case, 4...Display section, 6...
...Printing section, 7...Paper feeding section, 9...Belt, 10...
...Platen, 10a...Flat surface, 11...Thermal head, 13...Head mounting frame, 15
...Printing element section.

Claims (1)

[Scope of utility model registration request] The printing thermal head is rotatably attached to the head mounting frame, which is formed into a roughly L-shaped cross section.
In a print head positioning device that is provided with a lifting member so that the print element portion of the thermal head can be adjusted in angle in close contact with the flat surface of the platen of the printer, the print thermal head is attached to the print head through a head cover. A print head positioning device characterized by being attached to a mounting frame.