JPS58222870A - Platen - Google Patents

Abstract

PURPOSE:To reduce low-frequency noises generated when printing and prevent deformation from being brought about by shocks, by a method wherein the interior of a metallic pipe covered by an elastic material at its outside periphery is partitioned into a plurality of chambers. CONSTITUTION:A plurality of metallic disks 6 are dispersedly arranged on a platen shaft 8 so that slanted surfaces 5 of the disks 5 are slanted in the same direction, and are fixed by fixing rings 7 to constitute an internal structure 4. The structure 4 is inserted into the pipe 2 of an outer cylindrical body 1 in the direction of an arrow (a), starting from the side on which the diameter of the disk 6 is larger than that on the other side due to the formation of the slanted surface 5. In this case, since the diameter of the disks 6 is slightly larger than the inside diameter of the pipe 2, the disks 6 are inserted while being bent against the frictional force generated between tip parts 10 of the slanted surfaces 5 and the inside peripheral surface 9 of the pipe 2. Then, the platen shaft 8 is drawn out in the direction of an arrow (b) until the slanted surfaces 5 of the disks 6 come into contact with the inside peripheral surface 9 of the pipe 2, whereby the disks 6 are is fixed by rotating with a click feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a platen used in a printing device such as a printer. □ Conventionally, the platen used in printing devices such as printers has generally been a metal pipe whose outer periphery is coated with rubber elastic material, and printers using such platens,
In particular, in printers that use an impact printing method, such as wire dot printers, the impact sound generated when impact printing is performed on printing paper using a printing wire resonates within the cavity of the platen and propagates to the printer itself, causing noise. It was the cause. Among such noises, it is possible to prevent the vibrations of the platen from propagating to the printer body by covering the platen part or filling the space between the platen part and the printer body with damping material*i to prevent mid- to high-frequency sounds from being transmitted to the printer body. The sound can be muted relatively easily. However, low-frequency sounds could not be easily muffled by the above method.

The object of the present invention is to improve the above-mentioned conventional drawbacks, and to divide the cavity of a platen made of metal pipes into a plurality of compartments,
By dividing the length of the resonant column of the platen cavity itself into shorter lengths, the low-frequency sound generated during printing can be converted into mid-range or high-range sound, thereby reducing the printing sound and reducing the noise at the 7 o'clock mark. An object of the present invention is to provide a platen that is not easily deformed by impact.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is a side sectional view of the platen according to this embodiment. In the figure, the platen according to this embodiment is composed of an outer cylinder body 1 and an internal structure body 4. As shown in FIG. The outer cylinder body 1 is a metal pipe 2
The outer periphery of is covered with an elastic body 3 made of hard rubber,
As shown in FIG. 2, inside this outer cylinder 1, an inclined surface 5 is provided on the outer peripheral end surface, and a metal disk 6 having a diameter slightly larger than the inner diameter of the metal pipe 2 is attached to the inclined surface. 5
A plurality of internal structures 4 fixed to the platen shaft 8 by fixing rings 7 are inserted and fitted at appropriate intervals so that the inclination directions of the metal pipes 2 and 2 are the same. It is fixed in a state where it is in contact with the inner circumferential surface 9 of. With this configuration, in the platen according to this embodiment, the cavity within the metal pipe 2 of the outer cylinder 1 is divided into a plurality of compartments by the metal disk 6 of the internal structure 4. Furthermore, the diameter of the metal disk 6 is slightly larger than the inner diameter of the metal pipe 2, and when the inclined surface 5 of the metal disk 6 and the inner peripheral surface 9 of the metal pipe 2 are in contact with each other, Since the inclined surface 5 exerts a pressing force on the inner circumferential surface 9 in the radial direction from the platen shaft 8, each metal disc 6 is securely fixed within the metal pipe 2.

Next, a method for assembling the platen according to this embodiment will be explained based on FIGS. 3 and 4.

First, a plurality of metal disks 6 are distributed and arranged on the platen shaft 8 so that the inclined surfaces 5 have the same direction of inclination, and each metal disk 6 is fixed at that position by a fixing ring 7. This completes the internal structure 4. Here, for convenience of explanation, of both surfaces of the metal disk 6, the side whose diameter decreases due to the formation of the inclined surface 5 will be referred to as the back surface, and the other surface will be referred to as the front surface. l': Next, internal structure 4
As shown in FIG. 3, the metal disc 6 is inserted into the metal pipe 2 of the outer cylinder 1 in the direction of arrow A from the front surface side to a predetermined position. At this time, since the diameter of the metal disk 6 is slightly larger than the inner diameter of the metal pipe 2, there is a gap between the tip 10 of the inclined surface 5 and the inner peripheral surface 9 of the metal pipe 2. Although it is inserted while bending against the generated frictional force, the tip 1
0 and the inner circumferential surface 9 are in line contact with each other, so they can be inserted and fitted relatively easily.

Next, to securely fix the internal structure 4 inside the metal pipe 2, move the platen @ 8 in the direction of the arrow in FIG. Pull it out until it touches. At this time, each metal disc 6 is rotated with a click feeling about the tip 10 of the inclined surface 5 as a fulcrum, and the inclined surface 5 and the inner circumferential surface 9 are in contact with each other as shown by the broken line in FIG. Fixed.

Through the above steps, the platen shown in FIG. 1 is completed.

As explained above, the platen according to this embodiment has a plurality of metal disks 6 inserted into the cavity of the metal pipe 2,
Since the inside of the cavity is divided into multiple compartments, the length of the resonant column of the cavity itself of the metal pipe 2 is divided into shorter parts. Or it can be converted into a high-pitched sound. Therefore, since sounds in the middle and high ranges can be easily erased, the present invention provides a platen that can reduce printing noise.

Further, in the platen according to this embodiment, since the internal structure 4 is fixed with the inclined surface 5 of each metal disc 6 and the inner circumferential surface 9 of the metal pipe 2 in contact with each other, each metal The circular plate 6 is securely fixed inside the metal pipe 2, and the metal pipe 2 is reinforced.

Therefore, the platen is hardly deformed by impact during printing.

As described above, the present invention provides a platen that can reduce printing noise and is not easily deformed by impact during printing, and has great effects.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, and FIG. 1 is a side sectional view of the platen, FIG. 2 is a side view of the internal structure, and FIG. 3 is a side view of the internal structure of the outer cylinder. Side sectional view when inserting the structure, 4th
The figure is a partially omitted enlarged side sectional view for explaining a state in which the internal structure is fixed to the outer cylinder. In the figure, 2 is a metal pipe, 3 is an elastic body, 5 is an inclined surface, 6 is a metal disk, 8 is a platen shaft, and 9 is an inner peripheral surface. Patent Applicant Figure 1 Figure 2 365- Figure 4

Claims (1)

[Claims] A metal pipe whose outer periphery is coated with an elastic body, and a plurality of metal discs each having an inclined surface on the outer peripheral end face and having a diameter slightly larger than the inner diameter of the metal pipe. platen shafts are fixed apart from each other so that the inclined surfaces have the same inclination direction; A platen that is fixed within a metal pipe in a state in which it is in contact with the platen.