JPS58179676A - Printer cover - Google Patents

Abstract

PURPOSE:To obtain a printer cover capable of absorbing or damping sounds generated in printing operation by its space by providing the space to the printer cover by making at least part of the cover in double structure. CONSTITUTION:Inner covers 1a and 2a are integrally provided to the end part of a printing part incorporated with a platen 4 and a carraige 5 to make it in double structure and a lower cover 1 and an upper cover 2 forming a hollow part 16 are provided inside. Between the printing part and an electric circuit housing, plates 1b and 2b extending from the lower and upper covers 1 and 2 are mutually connected to form a partition wall. A reinforcing rib 18 is preferably provided between the upper cover 2 and the plate 2b in such a way as to make it serve as a vibration preventor for the partition wall.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solinta cover with a soundproof structure for an impact printer.

So-called impact printers, which print by hitting type with a hammer, make noise when printing121. Since this causes noise, this type of printer is generally equipped with a sound absorber or a soundproof cover to prevent the generated noise from emanating from the outside of the printer. These sound absorbers and soundproof covers are equipped with two parts of the platen, one part of the printing part where the carriage moves back and forth, and are designed to minimize the gap where sound leaks. . However, these noise countermeasures were not sufficiently effective because some noise was emitted to the outside through the printer cover itself.

Conventional printer covers (casings) are made of heavy metal, and a sound absorbing material such as urethane and a vibration-proofing material such as a rubber sheet are attached to the inner wall of the cover.1. was.

[, or [7] In this case, the sound absorbing material prevents reflection inside, and the vibration isolating material plays the role of lowering the resonant frequency of the cover. Break through and exit. However, there is an electrical circuit compartment on the printer's back that contains the VL, power supply, control circuit, etc., and this part generates heat, so we have vents in the printer cover for air cooling. The circuit housing part and the printing part 1, which is the sound source part, are connected, and therefore, sound leaks through the air holes. For this reason, there was a problem in increasing the number of air holes in order to improve the cooling effect. In addition, sound leaks from the gaps between the control levers, etc., and the cover itself makes noise due to vibrations, etc., and to put it mildly, the conventional blink horn bar itself has extremely little soundproofing or noise insulation effect. . For these reasons, it is thought that the effects of sound absorbers and soundproof covers have not been fully demonstrated.

In order to improve the drawbacks of the conventional example mentioned above, the present invention makes the printer cover that forms the front wall, side wall, etc. of the printing section double wall 1 or triple wall, and provides a hollow part to prevent problems that may occur during printing. The purpose of the present invention is to provide a 7° printer cover with a soundproof structure that absorbs or attenuates the sound generated by the printer in its hollow part, and further blocks the sound by providing a partition wall between the printed part and the electrical circuit housing part. be. 1M below, an embodiment will be described in detail with reference to the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which 1 is a lower cover fixed to the printer body, 2d is also an upper blade /<-1; is a front cover that can be opened and closed. in,
These covers 1.2.3 constitute a casing. 4 is a platen, a 5U carriage, on which a type string; an eel 6, a hammer 7, etc. are attached. 8d
This is a sound absorber placed along the platen 4, and the inside is filled with sound absorbing material Aj. 9 is a soundproof cover that covers the printing section, and is attached so that it can be opened and closed freely. 1o is a paper guide, 11 is a space motor for reciprocating the carriage 5, 12 is a power supply, 13 is an IJ print board containing a control circuit, etc., 14 is a storage sink for heat dissipation,
I5 is an air hole formed in the upper cover 2 for air cooling.

In front of the printing section that houses the platen 4, carriage 5, etc., there are lower covers 1 and 1 as shown in Figure 1 [7].
- The inner covers 1a and 2a are each integrally provided on the horn bar 2 to form a double structure, and a hollow portion 16 is formed between the outer cover and the inner cover.

The internal force bar 2++kl is also continuously provided on both left and right sides of the printed portion, and as shown in FIG. 2 (only one side is shown), the hollow portion 16 is also continuous. The mutually opposing wall surfaces of the outer cover and inner cover of this double structure are formed so as not to be parallel to each other. ．． I'm here.

Note that a sound absorbing material 17 such as urethane is pasted on the inner wall of the hollow portion 16.

Between the printing part and the electric circuit housing part, there is a plate part 1b formed integrally with the lower cover 1 and the second cover 2, respectively.
,, 2b extend and are connected to each other to completely partition the printing part and the electric circuit housing part. If there is a space motor etc. in this partition, place the heat-generating part of the motor on the electric circuit housing side and the drive transmission part on the printing part side, and attach the board as shown in Figure 3. The outer periphery of the motor 11 is fitted into the notches 1b and 2b. A reinforcing ridge 18 is formed between the cover 2 and the plate portion 2b, and also serves to prevent vibration of the partition wall.

In this embodiment configured as described above, as shown in FIG.
As mentioned above, the printer covers on the front and both sides of the printing section have a double structure, and a hollow section 16 is formed between them, so that the sound that is generated during printing penetrates through the inner cover and is removed from the outer cover. Hitting the inner wall? The sound is reflected back and forth between the inner cover and the outer cover, and is consumed as heat energy by Kokichi, who vibrates the inner cover, and the sound is absorbed. Because the printing section and the electrical circuit storage section are completely separated by the partition wall, the sound generated in the printing section can be transmitted to the electrical circuit storage section in a heavily attenuated state.
It is attenuated in this housing. Therefore, it is possible to increase the number of air holes in the electric circuit storage part to enhance the air cooling effect.

Note that the hollow portion 16 is configured so that the opposing wall surfaces are not parallel to each other, and the wall surfaces on both the left and right sides of the printing portion are not parallel to each other. However, if the wall surfaces are parallel to each other, This is because the sound is strongly reflected repeatedly during this time, and it takes a long time for it to decay. 1, the reinforcing ribs 18 provided on the partition wall are
It prevents the vibration of the partition wall and suppresses the transmission of sound to the electrical circuit compartment.

In the embodiment, the partition wall is extended from the lower horn part 1 and the upper cover 2, and the plate parts 1b and 2b are joined in the middle. It may be composed of interest. 1, as shown in Figure 5, the hollow part 1
If a large number of riffs 19 are placed alternately on each wall of the outer cover and inner cover in 6, the cover itself will vibrate. Enter part 16) / This sound is riff 1
9 times, a large number of reflections are repeated in a short period of time, and therefore the sound decays quickly.

FIG. 6 shows another embodiment of the present invention, in which a plurality of sound absorption holes 20 are provided in the inner cover 2a so that the sound is absorbed by the inner cover 21.
The sound absorbing effect is enhanced by making it easier to pass through the L and entering the hollow part, and by absorbing the sound that enters the hollow part by the sound absorbing material 17 and preventing it from escaping. - A gap is still created in the area in front of the printing area where the inner cover 1a of the lower cover 1 and the inner cover 2a of the upper cover 2 meet, and this gap is used as a sound absorption hole, and the edge of the inner cover 1a is It is used as gear ridge gear 11/-. Figures 7 and 8
The figure shows an example of sound absorbing holes 1, FIG. 7 shows a long hole, and FIG. 8 shows a large array of round holes. In FIG. 9, a gap similar to that in the front part of FIG. 6 is provided in the side part.

Figure 10 shows a cross section of the printer when the edge of the inner cover 1a of the lower cover 1 is used as a guide rail for the carriage.

FIG. 11 shows still another embodiment of the present invention, in which a partition 21 is further provided in the hollow part formed by the outer cover and the inner cover, and a first hollow part 22 and a second hollow part are provided. 2
3 and form I. It is generally known that sound is attenuated by layers of air. Therefore, even if the distance is the same, it is better to have a double wall, triple wall, or generally double wall to create a plurality of air layers to obtain a better damping effect.

Generally, inside the printer, sound is reflected by the inner wall surface of the casing L7, forming a standing wave L7. When the frequencies of the standing waves generated in the three directions of the room (vertical, horizontal, and height) match, a resonance phenomenon occurs. There is a natural vibration that occurs depending on the shape, and the length of each side of the rectangular parallelepiped is LX, T, , L,
, when the ratio becomes an integer multiple (for example, I:2:2), the natural vibrations overlap and the resonance at that frequency becomes greatly distorted. Generally, the natural frequency is expressed by the following formula.

f −'-v'("")" +(-1)2-1-
(-” )” (H7>2 LX LY
, L7゜Here, Lx, 'I, y''z=length of each side of the rectangular parallelepiped, C: sound speed, nX, nY+ nz: arbitrary integer From the above, in still another embodiment of the present invention As shown in Figure 12, the dimensional ratios of the chambers of the printing section are L
' L7 + = 3.2: 2.5: 1 to prevent sound amplification due to resonance by dispersing the natural frequency to an average value.

As explained above, according to the present invention, at least a part of the wall (including the bottom surface) surrounding the printed part 9- is formed into a double layered structure [7] to absorb and attenuate sound, By providing a partition wall between the printer cover and the electrical circuit compartment, it is possible to significantly reduce the leakage of sound to the outside of the printer.Furthermore, it is possible to prevent the printer cover itself from making noise due to vibration or resonance, etc. This has the advantage of making the environment in which it is used much quieter than before.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing the structure of an embodiment of the present invention, and FIG. 4 is a sectional view of the same embodiment, FIG. 5 kj, a sectional view of a modification of the one in FIG. 4,
FIG. 6 is a perspective view of main parts of another embodiment of the present invention, FIGS. 7 and 8 are perspective views showing examples of sound absorption holes, and FIG.
Figure 10 is a perspective view showing the gap created between the inner cover of the lower blade and the inner cover of the ten cover and the internal force of the lower blade. FIG. 11 is a sectional view showing the configuration of another embodiment of the present invention, and FIG. 12 is a sectional view showing the dimensions of the printing section in a still further embodiment of the present invention. It is a diagram explaining the ratio. 1.---Lower cover, 1a..Inner cover, 1b..Plate part, 2..
・Top cover, 2a...Song ・Inner cover, 2b...
・・・・・・ Plate part, 6... Type wheel, 7... Curve... Hammer, 16... Curve... Hollow part, 21...... Partition , 22...
...First hollow part, 23... Second hollow part. 11- Figure 2 Figure 3 Figure 12 Procedural amendment (spontaneous) May 20, 1980 Director General of the Japan Patent Office Shima 1) Haruki Tono 1 / Indication of the case Patent application No. 705 2 issued in 1986-6] Name of printer cover 3, relationship with the person making the amendment case Applicant address 1-3-6 Nakamagome, Ota-ku, Tokyo Name
Name (674) Rico Co., Ltd.
-Representative Takeshi Inuue 4, Agent 105 Telephone 03 (431) 8111 (Representative) 5 Number of inventions increased by amendment 07 Contents of amendment (1)
The scope of claims is amended as shown in the attached sheet. (2) Between page 8, line 20 and page 9, line 1 of the specification, it says: ``The above describes a type of printer that prints by hitting the type with a ---marker, but there are other types of printers that use type, such as It is clear that the present invention can also be applied to a wire-in 9-dot printer that prints by striking the tip of the wire onto paper via an ink ribbon without using the printer, and the same effect can be obtained.'' (3) Figure 1. Figures 2, 10, and 11 are corrected as shown in the attached sheet. A printer cover characterized in that it has a structure in which a hollow part is provided, and the sound generated during printing is absorbed or attenuated by the hollow part. (2) At least a portion of the printer cover has a double-layered structure to provide a hollow section, and a partition wall is provided between the printing section and the electric circuit housing section, and the hollow section absorbs and absorbs the sound generated during printing. 1. A printer cover, characterized in that the partition wall is used to attenuate or attenuate sound that passes through the electric circuit housing section and to the outside of the printer.

Claims (2)

[Claims] (1) In an impact printer of the type that prints by hitting the type with a hammer, at least one wall surrounding the printing part of the printer cover, such as the front wall and side wall of the printing part, is made into a double layer structure and a hollow part is provided, A printer cover characterized in that the hollow portion absorbs or attenuates the sound generated during printing. (2) In an impact printer of the type that prints by hitting type with a hammer, at least one wall surrounding the printing part of the printer cover, such as the front wall and side wall of the printing part, is made into a double layer structure, and a hollow part is provided. , a partition wall is provided between the printing section and the electric circuit storage section, the hollow section absorbs or attenuates the sound generated during printing, and the sound emitted to the outside of the printer through the electric circuit storage section is prevented. A printer cover characterized in that the printer cover is blocked by the partition wall.