JPH0213167Y2 - - 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.

This kind of ink platen has a simple structure and low cost, so attempts have been made to use it in place of ink ribbon devices, and now in addition to single-color ink platens,
Furthermore, the use of ink platens for color printing is 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 a rotating body, and inserting a transfer member impregnated with ink of a different desired color into each groove.

However, when creating a color image, the amount of ink consumed varies for each color, so if you try to replace the transfer member in the order in which the ink is used, you have to touch the transfer member directly with your hand, which has the disadvantage that your hands get dirty. .

The purpose of this invention is to improve the above-mentioned drawbacks and provide an ink platen that does not stain hands when replacing the transfer member.

A preferred example of this invention will be explained with reference to the drawings. FIG. 2 shows a transfer member. The transfer member has a transfer surface 1,
The third plate is arranged on the side opposite to the side on which the transfer surface 1 is provided.
A flat first engagement surface 5 that contacts the bottom surface 4 of the wide cross-section groove 3 of the rotating body 2 shown in the figure, and a flat first engagement surface 5 that is located between the first engagement surface 5 and the transfer surface 1 and side 6
The first and second engaging surfaces 5 and 7 define the height of the transfer surface 1, and the transfer surface 1 has a rectangular cross section. A frame body 9 formed on one side of an impregnated resin sintered body, for example, a 66 nylon sintered body 8, and having a channel-shaped cross section, the first and second engaging surfaces 5 and 7 holding the ink-impregnated resin sintered body 8. It is formed in For example, four of the transfer members configured as described above are connected to four wide cross-sectional grooves 3 radially provided on the circumferential surface of the rotating body 2, as shown in FIG.
is inserted into the ink platen.

When the first and second engaging surfaces are formed on the frame holding the resin sintered body in this manner, the distance between each transfer surface and the printing head striker at the printing position can be set to a predetermined value. That is, by cutting a resin sintered body 8 to create a transfer member having first and second engaging surfaces 5, 7 as shown in FIG. 8, and inserting it into the wide cross-sectional groove 3 shown in FIG. In this comparative example, the number of cutting engagement surfaces that determine the height of the printed surface 1 is larger than that of the one having a rectangular cross section, and together with the fact that the resin sintered body 8 has some elasticity, the first engagement surface 5 The cutting dimensional error of the second engagement surface 7 and the cutting dimensional error of the second engaging surface 7 accumulate, whereas when formed as described above, the frame 9 can be made from a non-expandable and rigid material. This is because the cumulative dimensional error of the first and second engaging surfaces 5 and 7 formed in the first and second engaging surfaces 9 can be kept to a minimum. Therefore, as shown in FIG. 1, the ink platen made in this manner is placed in front of the print head 10 of an impact printer, for example, a wire dot printer, so that any one of the transfer members can be placed in the printing position on the transfer surface 1 and print. The distance between the head 10 and the striking element can be maintained at a predetermined value. Reference numeral 11 indicates a printing paper.

FIG. 4 shows another example of the transfer member, which differs from the previous example in that the outer side surface of the frame body 9 has a tapered cross section, and this tapered cross section serves as the second engagement surface 7. Similar results can be obtained by inserting this transfer member into a groove 3' with a diverging cross section provided on the circumferential surface of the rotating body 2, as shown in FIG.

In each of the examples described above, the transfer member is attached to the wide cross-sectional groove of the rotating body, but it can also be configured to be attached to a protrusion provided on the circumferential surface of the rotating body. For example, FIG. 6 shows a curved first engagement member disposed on the side opposite to the side on which the transfer surface 1 is provided and in contact with a peripheral surface portion 13 other than the protrusion 12 of the rotating body 2 shown in FIG. A recess 14 is formed on the mating surface 5 and the first mating surface 5.
In the transfer member, the ink-impregnated resin sintered body 8 has the transfer surface 1 formed to have a rectangular cross section.
formed on one surface of the first and second engaging surfaces 5, 7.
is formed in a frame 9 having a channel-shaped cross section and holding an ink-impregnated resin sintered body 8. Similar results can be obtained by press-fitting the transfer member constructed in this way into a protrusion 12 provided on the circumferential surface of the rotating body 2 as shown in FIG.

Since the ink platen constructed as described above employs a frame body, the ink-impregnated resin sintered body can be replaced by grasping the frame body by hand.

As explained above, this invention has a simple structure in which the ink-impregnated resin sintered body is inserted and bonded to the frame, and has the effect of preventing hands from getting dirty when replacing the ink-impregnated resin sintered body.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an impact printer equipped with the ink platen of this invention, Figure 2 is an enlarged sectional view of the transfer member, Figure 3 is a sectional view of the ink platen with the same transfer member attached, and Figure 4 is the transfer An enlarged sectional view showing another example of the member, FIG. 5 is a sectional view of an ink platen with the same transfer member attached, FIG. 6 is an enlarged sectional view showing another example of the transfer member, and FIG. 7 is an enlarged sectional view with the same transfer member attached. FIG. 8 is an enlarged sectional view of a transfer member of a comparative example, and FIG. 9 is a sectional view of an ink platen with the same transfer member attached. DESCRIPTION OF SYMBOLS 1... Transfer surface, 2... Rotating body, 3... Wide cross-sectional groove, 4... Groove bottom surface, 5... First engagement surface, 6... Groove side surface, 7... Second engagement surface, 8 ... Ink-impregnated resin sintered body, 9 ... Frame body, 12 ... Protrusion, 15 ... Protrusion top surface.

Claims (1)

[Scope of utility model registration request] An ink platen for impact printers, in which a plurality of frames having a channel-shaped cross section along the circumferential direction of a rotating body are removably connected to the circumference of the rotating body, and a resin sintered body impregnated with ink is inserted and connected to each frame. .