JPH0213169Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an ink platen for impact printers suitable for color printing.

In an impact printer, the platen is formed of a porous material, the porous material is impregnated with ink, and the ink can be transferred to the paper by striking the paper with a striker of the impact printer.

Since such ink platens have a simple structure and are low cost, attempts have been made to use them in place of ink ribbon devices, and the use of ink platens for color printing in addition to single-color printing is currently being considered. .

A typical example of a color ink platen is the Utility Model 53-
This method is disclosed in Japanese Patent No. 136212, and is constructed by providing a plurality of grooves along the circumferential direction of the rotating body, and inserting a porous material impregnated with ink of a different desired color into each groove.

Although color printing is possible with such an ink platen, it is not always possible to replace or fix the porous material sufficiently. In other words, when creating images for color printing, the amount of ink consumed varies for each color, so it is necessary to replace the porous material with a new porous material in the order in which the ink is used up. There were drawbacks such as insufficient bonding of the porous material to the body.

The object of this invention is to provide an ink platen that can improve these drawbacks.

This invention will be explained with reference to the drawings. In FIG. 1, reference numeral 1 indicates an ink platen. A printing head 2 of an impact printer, such as a wire dot printer, is disposed in front of the platen 1, and the printing head 2 is movable along the axial direction of the ink platen 1. 3 indicates paper.

The ink platen 1 has a plurality of grooves 6 along the circumferential direction of the rotating body made up of a shaft 4 and an outer cylinder 5 fixed to the shaft, and each groove is made of a porous material impregnated with ink, such as 66 A resin sintered body 7 such as a nylon sintered body is inserted, and the groove 6 and the porous material 7 are formed to have a widening cross section as shown in FIGS. 1 and 3. A recess 8 is provided on the back surface of the porous material 7, and a guide hole 9 extending in the axial direction of the rotating body is bored in the bottom portion of the groove 7 corresponding to the recess 8. Furthermore, a click motion device consisting of a pressing body 10 and a spring 11 for bringing the pressing body into contact with the recess 8 of the porous material 7 is inserted into the guide hole 9. In this example, the shaft 4 and the outer cylinder 5 are assumed to be separate bodies, but they may be the same body.

Even if the ink platen 1 configured as described above is rotated to place one of the porous materials 7 pressed by the click motion device at the printing position,
Since the groove 6 and the porous material 7 have a widening cross section, a click motion device is provided in the recess 8 on the back side of the porous material 7 and the bottom of the groove 6, so that the porous material to be replaced can be inserted and removed. The porous material can be replaced by simply moving it lightly in the direction, and the porous material 7 can be replaced by the engagement and disengagement action between the recess 8 and the pressing body 10. movement is prevented.

When replacing the porous material, if the portion of the porous material 7 other than the printed surface 12 is covered in advance with a sealing material 13 as shown in FIG. 4, it is possible to prevent hands from getting dirty.

Note that porous materials impregnated with ink are usually formed by impregnating inks of different colors, but if necessary, at least two of the plurality of porous materials may be impregnated with ink of the same color. Good too.

As explained above, the ink platen of this invention has a simple structure in which the shapes of the grooves, the porous material, and the location of the click motion device are specified, and the porous material is securely connected to the rotating body.
This has the effect of making it easier to replace the porous material.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the arrangement of the ink platen of this invention, Fig. 2 is a longitudinal cross-sectional view of the same ink platen with the middle portion omitted, and Fig. 3 is a view taken from Fig. 2 A-A.
FIG. 4 is a cross-sectional view showing the porous material of the ink platen. 1... Ink platen, 4... Shaft, 5...
... Outer cylinder, 6 ... Groove, 7 ... Porous material, 8 ... Recess, 9 ... Guide hole, 10 ... Pressing body, 11 ...
Spring.

Claims (1)

[Scope of utility model registration request] In an ink platen for an impact printer, in which a plurality of grooves are provided along the circumferential direction of a rotating body and a porous material impregnated with ink is inserted into each groove, the grooves and the porous material are formed to have a widening cross section. death,
A recess is provided on the back side of the porous material, and a guide hole extending in the axial direction of the rotating body is provided at the bottom of the groove corresponding to the recess, and a pressing body is inserted into the guide hole and the pressing body is inserted into the recess of the porous material. An ink platen for an impact printer, characterized in that a click motion device made of a spring is inserted into the ink platen.