JP2529463Y2 - Soundproofing equipment for printing press - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof device in a printing press, particularly in an office offset printing press or a stencil printing press.

2. Description of the Related Art Conventionally, as a printing machine of this type, various types of paper can be stacked on a paper feed tray, and the paper feed tray is moved up and down by an elevator system, and fed and discharged by a so-called straight path system, so that a short time can be obtained. A printing machine capable of printing on a large amount of paper is desired, and a printing machine as shown in FIGS. 5 and 6 has been proposed, which will be briefly described.

In this printing press, reference numeral 1 denotes a printing press main body, and reference numeral 2 denotes a mounting table.

Then, a pair of both side plates 5, 6 established in the printing press main body 1.
The printing drum 3 inside and the press roller 7 are horizontally bridged below, and the driving members 8 and 9 of the printing drum 3 and the press roller 7 are mounted outside.

Reference numerals 11 and 12 denote a plate making unit and a plate discharging unit provided between the side plates 5 and 6 with the printing drum 3 interposed therebetween, respectively.
Paper supply / discharge openings 16 and 17 are provided on both sides of the side plates 5 and 6 in a direction perpendicular to the printing drum 3, and a paper feed table 20 is mounted in the opening 16 so as to be movable up and down. A roller 18 is provided.

A paper discharge belt 19 is provided on the opposite side of the press roller 7 from the feed roller 18, and a paper discharge tray 21 is provided in front of the paper discharge belt 19. The bottom plate 23 connecting the side plates 5 and 6 at the bottom is provided with legs 26 at its four corners, and a bottom opening 24 is provided in the middle between them, and this opening 24 is used for heat dissipation.
It is provided to reduce weight and save material.

An upper cover 29 and side covers 27 and 28 are detachably provided so as to surround such members.

Problems to be Solved by the Invention This type of conventional printing press is installed and used in a dedicated printing room, and even if noise is generated, it does not cause any particular trouble in other parts. No attempt was made to prevent the occurrence. That is, even in the printing press described above,
In addition to the opening portions 16 and 17 being large, a large opening portion 24 is provided in the bottom plate 23, and the internal noise is radiated to the outside from these opening portions 16, 17 and 24.

However, recently, since this type of printing press has been used in ordinary offices or shops, noise generation has become a serious problem. To solve this problem, the printing speed has been reduced.However, this method is extremely inefficient.Therefore, it is necessary to separately cover the printing press with a cloth cover during printing or to attach rubber feet. Substitution of a soft rubber, a reduction of the gear speed by a belt reduction method, and the like have been performed, but none of them has a problem that a sufficient soundproofing effect cannot be obtained.

An object of the present invention is to solve the above-mentioned problems of the conventional soundproofing device and to provide a soundproofing device capable of effectively preventing noise generated in the printing press main body during printing from radiating to the outside. It is in.

Means for Solving the Problems The present invention is characterized in that, in the conventional printing press described above, a sound absorbing material is interposed between the printing press main body and the mounting table in substantially the same area as both opposing surfaces of both. It is assumed that.

In the soundproofing device of the present invention as described above, noise generated in the printing press main body at the time of printing and radiating from the opening of the bottom plate to the outside is absorbed by the sound absorbing material closing this opening. Does not dissipate outside.

Embodiment In the first embodiment of the present invention shown in FIGS. 1 and 2 and the second embodiment shown in FIG.
Since the configuration is the same as that of the already-proposed printing press shown in the figure, the description of this portion will be omitted by referring to the same reference numeral, and the different portion will be mainly described.

Sound absorbing members 13 and 14 made of a foam material are adhered to outer surfaces of support members of the plate making and feeding unit 11 and the plate discharging unit 12.
As the sound absorbing materials 13, 14, maltoprene SC10 or SC20 manufactured by Inoue MTP Corporation is used. Output tray
A sound absorbing material 25 made of a foamed material and having a smooth surface is attached to the inner surface of the end face 22 of 21. And, on the inner surfaces of the outer covers 27, 28, 29, damping members 30, 31, and sound absorbing members 32, 33 made of a foam material are sequentially attached. The damping materials 30, 31 are made of Calmflex RV-3 made of polyvinyl chloride manufactured by Inoue MTP Co., Ltd. and having a thickness of 3 mm. The sound absorbing materials 32, 33 are the same as the sound absorbing materials 13, 14. Used.

A sound-absorbing material 36 made of a foam material is interposed between the bottom plate 23 of the printing press main body 1 and the top plate 15 of the mounting table 2. 2
And the thickness thereof is substantially equal to the distance between them. In this case, the sound absorbing material 36 provided with a through hole 37 at a position facing the leg 26 in advance is placed on the top plate 34, and the printing press body 1 is placed on the top. As shown in the figure, each of the sound absorbing members 36-1 and 36-2 is provided with a through hole 37, and a cut groove 38 extending from the central cutting line 39 to the through hole 37 is provided. The printer main body 1 is placed on the placing table 2, and an opening is formed by a cut groove 38, the leg 26 is guided from the opening and pushed into the through hole 37. In this case, as the sound absorbing material 36, a maltoprene SC27 manufactured by Inoue MTP Co., Ltd. having a size of 630 mm × 560 mm and a thickness of 27 mm is used.

In such a printing press, the sources of noise are roughly classified as follows.

(1) When the printing paper 40 is fed by the feed roller 18 in accordance with the rotation timing of the printing drum 3, the printing paper 40
Bending occurs and emits a "pan" sound when it disappears.

(2) At the time of printing, the press roller 7 intermittently collides with the print drum 3 at a high speed, and at that time, a "don" sound is generated.

(3) Sound is generated by the meshing of the transmission gear systems of the driving members 8 and 9 and the intermittent contact between the cam and the cam follower.

(4) When the printed paper is conveyed to the discharge belt 19 and hits the end face 22 of the discharge tray 21 at a high speed,
Generates the sound of a tongue.

These noises are absorbed by the sound absorbing materials 13, 14; 32, 33, and 36, but the noise that is radiated to the outside from the opening 24 of the bottom plate 23 is absorbed by the sound absorbing material 36. The noise that has not been absorbed in this way is transmitted to the top plate 34 of the table 2.
The reflected noise is absorbed by the sound absorbing material 36, and thus the sound absorbing material 36 absorbs a large amount of noise, so that the noise radiated to the outside from the openings 13, 14 is significantly reduced. It will be.

Table 1 shows the noise level measured in each part of the conventional printing press having no such sound absorbing material and this embodiment.
It can be seen from Table 1 that the noise level can be reduced by about 2 to 6 dB only by adding the sound absorbing material.

The second embodiment of the present invention shown in FIG. 3 differs from the first embodiment in that soundproof units 41 and 42 are provided in openings 16 and 17 and exterior covers 27 and 28 are removed. The other points are the same as those of the first embodiment. Soundproofing unit 41
Is composed of a fixed cover 43 attached to the machine frame at the lower part of the sheet feeding table 20, and an opening / closing cover 44 pivotally supported by a pivot 46, and reference numeral 47 denotes a handle thereof.

The soundproofing unit 42 is composed of a fixed cover 48 attached to the machine frame at the lower part of the paper discharge tray 21 and an opening / closing cover 51 pivotally supported by a pivot 49. Numeral 52 denotes a handle.

In this embodiment, the fixed covers 43 and 48 are made of sheet metal, and the sound absorbing members 53 and 54 made of the same foam material as in the first embodiment are provided inside the fixed covers 43 and 48.
And the opening / closing covers 44, 51 are formed of a translucent acrylic plate.

In this embodiment, the state of the paper feed tray 20 and the paper discharge tray 21 is seen through the open / close covers 44 and 51, and when the print paper 40 becomes insufficient and the amount of the paper discharge 45 increases, a handle is used.
Open the open / close covers 44, 51 with 47, 52 and supply paper,
Or take it out, otherwise use it with the open / close covers 44, 51 closed. The result of use in this way is that opening 1
The radiation of the noise from 6,17 is blocked, so that a more effective soundproofing is achieved.

For this embodiment and the conventional apparatus, the noise levels measured in the same manner as in the first embodiment are shown in Table 2, and it can be seen from Table 2 that the embodiment can reduce the noise level by about 12 to 13 bB. If a sound absorbing material is attached to the open / close covers 44, 51, this level can be further reduced.

The effect of the present invention is as described above. Between the bottom plate having the opening of the printing press main body and the table, the thickness is substantially the same as the gap between the two opposing surfaces, and the same area as the opposing surface is obtained. The sound absorbing member is interposed, and the legs of the printing press main body are fitted into the through holes provided in the sound absorbing member. The opening is generated inside the printing press main body, and serves to radiate heat from the bottom plate and reduce the weight. The sound absorbing member absorbs and dissipates the noise that tries to radiate to the outside from the gap between the printing press main body and the table through the sound absorbing member, and the sound absorbing member has a simple structure and is lightweight. There is an effect that it can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 of the same, FIG. 3 is a vertical sectional front view of the second embodiment, and FIG. FIG. 5 is a plan view of a modified example of the sound absorbing member interposed between the printing press main body and the table, FIG. 5 is a vertical front view of a conventional example of this type of soundproofing device, and FIG. It is sectional drawing. DESCRIPTION OF SYMBOLS 1 ... Printing machine main body, 2 ... Mounting table 3 ... Printing drum, 16 ... Feeding opening 17 ... Discharge opening, 20 ... Feeding tray 21 ... Discharge tray, 23 ... Bottom plate 24 ... Bottom opening, 26 ... Legs 36 ... Sound absorbing material, 40 ... Printing paper 41,42 ... Sound proof unit, 43 ... Fixed cover 44 ... Openable cover, 45 ... Ejection 48 ... Fixed cover, 51 ... Openable cover

Claims (1)

(57) [Scope of request for utility model registration] 1. A printing machine having a printing drum, a press roller for pressing a printing sheet against the printing drum, a paper feeding means, and a paper discharging means, and a table on which the printing machine body is mounted. In the printing press, an opening is provided in a bottom plate of the printing press main body, and the printing press main body is placed on a table with legs provided on a back surface of the bottom plate, and between the bottom plate of the printing press main body and the table,
A sound absorbing member having substantially the same thickness as the gap between the two opposing surfaces and having substantially the same area as the opposing surface is interposed, and the legs of the printing press main body are fitted into through holes provided in the sound absorbing member. Soundproofing device.