JP2001301119A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer having a small noise. SOLUTION: A stencil printer 1 comprises a housing 2, a plate cylinder provided in the housing, a first opening 7 and a second opening 17 provided at the housing, a sheet feeder 8 provided in the first opening, a delivery 18 provided in the second opening, a first cover 16 covering the first opening and the feeder, a second cover 33 covering the second opening and the delivery, a sound absorber 20 provided in a printing sheet conveying route for communicating with the feeder, a printing unit and the delivery, and an air distributing means 30 for forming a flow of the air in the second cover covering the delivery. In this case, the distributing means 30 has a filter 35 for recovering a paper dust. A noise radiated from the cylinder is enclosed therein to be effectively absorbed, thereby reducing the noise of the printer. Thus, paper arrangeability of the delivery is improved, and the dust can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus with low noise.

[0002]

2. Description of the Related Art A general stencil printing apparatus will be described as an example of a printing apparatus. The stencil printing apparatus has a plate cylinder as a printing unit inside a housing. The plate cylinder rotates about its own axis. At least a portion of the peripheral wall of the plate cylinder is ink-permeable. A stencil sheet made by stencil is wound around the outer peripheral surface of the peripheral wall. Inside the plate cylinder, there is an ink supply means for supplying ink to the inner peripheral surface. Below the plate cylinder there is a pressing means. The printing paper is printed while being conveyed while being sandwiched between the pressing means and the plate cylinder. A first opening is provided on one surface of the housing, and a paper feeding unit for feeding printing paper from the first opening to the plate cylinder is provided here. A second opening is provided on the other surface of the housing, and a discharge unit for receiving printing paper discharged from the plate cylinder and coming out of the second opening is provided here.

In this stencil printing apparatus, high-speed printing can be performed by rotating the plate cylinder at a high rotation speed. In order to cope with high-speed printing, the paper feeding unit, the plate cylinder, and the paper discharging unit are arranged almost linearly. Further, two openings of the housing provided with the paper feeding unit and the paper discharging unit are formed large for removal of jammed paper and maintenance.

[0004]

Therefore, in this stencil printing apparatus, the noise generated by the plate cylinder inside the housing comes directly out of the two openings, so that it is very noisy. In particular, in recent years, networking of office equipment has progressed, and the opportunity for using a printing press in an office has increased, so this noise has become a serious problem. Such problems and their causes are not only found in the stencil printing apparatus but generally also in printing machines characterized by high-speed printing.

An object of the present invention is to provide a printing apparatus with low noise.

[0006]

According to a first aspect of the present invention, there is provided a printing apparatus (stencil printing apparatus) including a housing (2) and a printing unit (plate cylinder 4) provided inside the housing. A first opening (7) provided in one of the housings, and a supply of printing paper (6) to the printing unit through the first opening provided in close proximity to the first opening. A paper section (8), a second opening (17) provided in the other side of the housing, and a paper sheet ejected from the printing section through the second opening provided near the second opening. Paper receiving unit (18) for receiving waste printing paper
A first cover (16) that covers the first opening and the paper feeding unit; a second cover (33) that covers the second opening and the paper discharging unit; A sound absorbing body (20) provided in a transport path of the printing paper that communicates a printing unit and the paper discharging unit, and an air circulating unit that forms a flow of air in the second cover that covers the paper discharging unit ( 30).

According to a second aspect of the present invention, in the stencil printing apparatus of the first aspect, a filter (35) for collecting paper dust is provided in the air circulation means (30). And

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stencil printing apparatus 1 according to a first embodiment of the present invention will be described with reference to FIG. The stencil printing machine 1 has a housing 2. The housing 2 is movable by wheels 3. Inside the housing 2, a plate cylinder 4 as a printing unit is provided. The plate cylinder 4 rotates about its own axis. At least a part of the peripheral wall of the plate cylinder 4 is ink-permeable. A stencil sheet made by stencil is wound around the outer peripheral surface of the peripheral wall. Inside the plate cylinder 4, there is an ink supply means for supplying ink to the inner peripheral surface. Below the plate cylinder 4,
There is a pressing roll 5 that can move between a position where it contacts the plate cylinder and a position where it separates. The printing paper 6 is printed while being conveyed while being sandwiched between the pressing roll 5 and the plate cylinder 4.

A first opening 7 is formed on the front surface of the housing 2. The first opening 7 is provided with a paper feed unit 8 for feeding printing paper to the plate cylinder 4. The paper supply unit 8 includes a paper supply table 9 attached to the first opening 7, and paper supply means 10 for sending the printing paper on the paper supply table 9 to the plate cylinder 4. Paper feed table 9
Are located inside the first opening 7. The paper feed table 9 includes a pair of side plates 1 that regulate the printing paper in the width direction.
1 and an elevating mechanism. The elevating mechanism raises and lowers the paper feed table 9 on which the print paper 6 is loaded, and sets the uppermost print paper to the paper feed position. The paper supply unit 10 includes a take-out roll 12 that takes out and sends out the print paper 6 set at the paper supply position.
And the guide plate 13 and the printing paper 6 taken out from the plate cylinder 4.
And a pressure roller 5 and a paper feed roll 14 to be fed at an appropriate timing.

At the lowermost part of the first opening 7, there is provided a sound absorbing body 20a which covers the lower surface of the sheet feeding table 9. Sound absorber 20
The outer shape of “a” is larger than the sheet feeding table 9, and a part thereof is inside the first opening 7. A frame 15 is attached to the front surface of the housing 2 above the sound absorbing body 20a so as to surround the first opening 7. A first cover 16 is attached to the frame 15 so as to be openable and closable. The first cover 16 has a substantially box shape with an open lower surface and a rear surface. When the first cover 16 is closed and installed on the upper surface of the sound absorbing body 20a, the sheet feeding table 9 and the printing paper 6 can be covered and hidden. That is, the first opening 7 is closed to the outside of the device.

[0011] Separate sound absorbers 20b to 20g are provided inside the first cover 16 and the housing 2. These sound absorbers have the same structure and a plate shape as the sound absorber 20a. The sound absorbing materials 20 c to 20 g are arranged so as to surround at least a part of the plate cylinder 4 and at least a part of the transport path of the printing paper 6.

A second opening 17 is formed on the rear surface of the housing 2. The second opening 17 has a discharge unit 18 for conveying and receiving the printing paper 6 discharged from the plate cylinder 4.
Is provided. The paper discharge unit 18 includes a conveying unit 19 provided in the housing 2 next to the plate cylinder 4, and a paper discharge table 21 connected to the outer surface of the housing 2 near the second opening 17. I have. The conveying means 19 is a belt 19 wound around a pulley.
a and suction means 19b for sucking the printing paper 6 and fixing it to the belt 19a. The paper discharge table 21 has a pair of side plates 22 and a collision plate 23.

An air circulating means 30 is provided adjacent to the casing 2 on the side of the second opening 17. The air circulation means 30 includes a movable base 32 having wheels 31,
A second cover 33 is provided on the upper surface side of the base 32 so as to be openable and closable. When the stencil printing apparatus 1 is used, the air circulation means 30 is connected to the second opening 1 of the housing 2 of the stencil printing apparatus 1.
The paper discharge tray 21 is stored in the second cover 33. The base 32 of the air circulating means 30 has a sound absorbing body 20h on each surface.
4 and a filter 35 are provided. The suction fan 34 sucks the inside of the second cover 33 via the filter 35. The printing paper 6 discharged onto the paper output tray 21 is
The air in the vicinity of the paper discharge tray 21 is dropped along with the paper tray 21
However, since the sheet discharge tray 21 is covered by the second cover 33, the flow of the air is considered to be stagnant. However, as described above, the air flow that sucks the inside of the second cover 33 secures an escape area for the air that pushes out the printing paper falling on the paper output tray 21, Paper alignment is improved. Furthermore, since the paper dust floating in this space can be collected by the filter 35,
To prevent deterioration of print quality due to adhesion of paper dust to printed matter, and to prevent paper dust stains in offices, which is a particular problem when using printing paper that easily generates paper dust such as paper change. Can also.

The first cover 16 in the example described above
The material of the second cover 33 is not particularly limited, but it is preferable that at least a part of the second cover 33 is made of a transparent resin or the like so that the inside can be confirmed. Further, fins may be provided inside the cover to make the air flow more effective and increase the rigidity of the cover itself.

The sound absorber in the above-described example includes:
For example, fibrous materials such as glass wool and urethane can be used, but they are punched metal or perforated plates based on the principle of resonance absorption to protect the surface. May be superimposed on each other having a resonance frequency close to the frequency band of the above level. When a sound wave that is a source of noise collides with such a sound absorbing body, energy is dissipated due to the viscosity of the medium (air) and heat conduction of the sound absorbing body, or energy corresponding to a loss of momentum due to wall friction due to the movement of the medium. Is dissipated, thereby suppressing noise.

FIG. 1 shows the stencil printing apparatus 1 viewed from a line parallel to the rotation axis of the plate cylinder 4. In this figure, a wall of a housing 2 that can be opened and closed to approach the plate cylinder 4 and an internal mechanism of the printing apparatus are arranged on the front side and the back side of the plate cylinder 4 represented by circles, respectively. . Sound is hard to leak from the place where the object exists, such as the end face side of the plate cylinder 4 in the axial direction,
A major part of the noise in the stencil printing machine 1 is considered to be air propagation noise from an opening directly communicating with the portion where the plate cylinder 4 is installed, such as the openings 7 and 17 described above.

Therefore, in this embodiment, the transport path of the printing paper 6
That is, both ends of the path composed of the paper supply unit 8, the printing unit (plate cylinder 4), and the paper discharge unit 18 which are continuously and communicated are connected to the first and second covers 1
6, 33 is closed to eliminate noise leakage, and at least a part of the path is surrounded by a sound absorbing body 20 to absorb noise.

Further, according to this embodiment, since the sound absorbing body is provided in the inside of the cover, the inside of the housing 2, a part of the sheet feeding table 9 and the sheet discharging table 21, etc., it greatly contributes to the sound absorption with respect to the peak frequency of the noise. In addition, the overall noise level was reduced and the auditory timbre was improved.

[0019]

According to the present invention, the paper feeding section, the printing section, and the paper discharging section, which are the paths for continuous printing of the printing paper, are closed by two covers, and Since the sound absorber is provided in the path and the air circulation means for forming the air flow in the paper discharge section is provided, the noise generated by printing is effectively absorbed while being confined inside, thereby reducing the noise of the printing apparatus. And improve the paper alignment of the paper discharge section,
Further, there is an effect that the paper dust can be removed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stencil printing apparatus 1 according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stencil printing apparatus as a printing apparatus, 2 ... housing | casing, 4 ... plate cylinder as a printing part, 7 ... 1st opening, 8 ... paper feed part, 16
.., A first cover, 17, a second opening, 18, a paper discharge unit, 2
0: sound absorber, 30: air circulation means, 33: second cover, 35: filter.

Claims (2)

[Claims] 1. A housing, a printing unit provided inside the housing, a first opening provided in one of the housings, and a first opening provided in close proximity to the first opening. A paper feed unit that sends print paper to the printing unit via one opening; a second opening provided in the other side of the housing; and the second opening provided in close proximity to the second opening A first cover that covers the first opening and the paper supply unit; a first cover that covers the first opening and the paper supply unit; and a second cover that covers the second opening and the paper discharge unit. A cover, a sound absorber provided in a transport path of the printing paper that communicates the paper feeding unit, the printing unit, and the paper discharging unit, and air inside the second cover that covers the paper discharging unit. A printing apparatus having an air circulation means for forming a flow. 2. The stencil printing machine according to claim 1, wherein a filter for collecting paper dust is provided in said air circulation means.