JP3364539B2 - Image forming device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an office offset printing machine and a stencil printing machine, and more particularly to a soundproofing apparatus for those apparatuses.

[0002]

2. Description of the Related Art Generally, the image forming apparatus for forming an image according to the content of an original image or the like includes the above-mentioned printing machine, copying machine and printer. Some of the above-described image forming apparatuses have a structure in which a sheet discharge port is formed in a part of the apparatus main body to discharge the image-formed sheet toward the sheet discharge tray. Inside the image forming apparatus, members such as a motor serving as a driving source and an operating member used for a structure related to an image forming process are frequently used as a noise source that emits noise.

In recent years, such image forming apparatuses, particularly printing machines,
Regulations on noise from copiers, personal computers, etc. have become stricter, and demands for noise reduction have become stronger. On the other hand, the machine itself is required to have a higher speed, the rotational speed of the drive system and the interlocking speed of the mechanical transmission system are increased, and the noise tends to be louder.

A printing machine, which is one of the above-mentioned image forming apparatuses, will be described with reference to FIGS. 19 to 29.
This printing machine can load various types of paper on the paper feed table, moves the paper feed table up and down by an elevator system, and reduces the curved path in the paper conveyance path from the paper feed section to the paper ejection section to reduce the curved line. This is a high-speed printing machine capable of printing a large amount of paper while shortening the time required to convey the paper, by making the so-called straight path method possible by forming the paper.

In FIG. 19, this printing machine is equipped with a printing drum device 1 forming a plate cylinder. Printing drum device 1
Is mainly composed of a cylindrical body having a porous structure and a mesh screen provided on the outer periphery thereof. A base paper clamper 2 that can be brought into contact with and separated from the surface of the print drum device 1 is provided on the outer peripheral portion of the print drum device 1. The base paper clamper 2 transmits a driving force by an opening / closing device (not shown). As a result, it can be opened and closed at a predetermined position to come into contact with and separate from the surface of the printing drum device 1. One end of a heat-sensitive stencil sheet (not shown) (hereinafter referred to as a stencil master) is held by the stencil paper clamper 2 so that the stencil master can be wound around the outer peripheral surface of the printing drum device 1. There is.

The stencil master is selectively perforated by a thermal head (not shown) in the plate-making writing device 19 on the right side of the printing drum 1 based on the information of the original document,
It is conveyed and wound around the outer peripheral surface of the printing drum device 1.
Further, there is a plate discharging device 20 on the left side of the printing drum device 1, and a used stencil master already wound around the outer peripheral surface of the printing drum device 1 is peeled off and stored.

When printing, the print drum device 1 is shown in FIG.
It is rotated in the clockwise direction by the driving devices 30 and 31 shown in FIG. In FIG. 19, a structure for leaching ink is provided inside the printing drum device 1. That is, inside the printing drum device 1, an ink roller 1a that rotates in synchronization with the same direction as the direction in which the printing drum device 1 is rotated, and the ink roller 1a are arranged to face each other with a slight gap therebetween. Doctor roller 1b
There is. These ink roller 1a and doctor roller 1
An ink reservoir 1c is formed by the wedge-shaped space with b.

At the time of printing, ink is supplied to the ink reservoir 1c from the hole of the ink pipe 1d. Ink fountain 1
The amount of the ink of c is regulated by the doctor roller 1b and is supplied to the outer peripheral surface of the ink roller 1a. The ink supplied to the outer peripheral surface of the ink roller 1a is supplied to the inner peripheral surface of the printing drum device 1 as the ink roller 1a rotates.

Below the outer peripheral surface of the printing drum device 1, the press roller 3 is disposed so as to face the ink roller 1a.
Is located. The press roller 3 is pivotally attached to one end side of an arm 5 which is swingable around a support shaft 4, and can be brought into contact with and separated from the outer peripheral surface of the printing drum device 1 according to the swing of the arm 5. It is provided in. The press roller 3, the arm 5, the support shaft 4, and the like constitute an ink coating / conveying device 92.

The ink applying / conveying device 92 is separated from the print drum device 1 at a predetermined timing by a cam (not shown) that rotates in synchronization with the print drum device 1.
Collision with the base paper clamper 2 is avoided. Base paper clamper 2
After the sheet has passed, the printing paper 32 is conveyed between the press roller 3 and the outer peripheral surface of the print drum device 1, and at the same time, the press roller 3 is pressed against the outer peripheral surface of the print drum device 1.

On the lower left side of the printing drum device 1, FIG.
As shown in FIG. 22 and FIG. 23, in the state in which the paper ejecting claw 16 for peeling the printing paper 32 after printing (after ink application) from the outer peripheral surface of the printing drum device 1 and the peeled printing paper 32 are sucked The discharge conveyance belt 15 that forms the main part of the suction conveyance device 46 that conveys the paper, the discharge tray 17 that has a partition 18 that aligns the leading ends of the printing paper 32 that is conveyed by the discharge conveyance belt 15, and the maintenance and jam paper. A paper discharge opening 29 is provided as a paper exit for easy removal.

The paper ejecting claw 16 ejects air from the front end of the paper ejecting claw 16 at a predetermined timing according to the front end of the printing paper 32 by a pump (not shown). In addition, the paper ejection pawl 16 is swung at a predetermined timing matched with the front end of the printing paper 32 by a driving device (not shown), and the front end is brought close to the outer peripheral surface of the print drum device 1 to move the outer periphery of the print drum device 1. The peeling of the printing paper 32 from the surface is promoted.

On the lower right side of the printing drum device 1, an elevator type paper feed table 12 for stacking a plurality of printing papers 32 is provided.
And a sheet feeding device 93 (see FIG. 19) that feeds and conveys the printing paper 32 to the ink applying and conveying device 92. A paper feed opening 28 is provided so that the print paper 32 can be carried in, jammed paper can be removed, maintenance can be performed, and the paper feed tray 12 can be raised and lowered.

The elevator type paper feed tray 12 is shown in FIG.
As shown in FIG. 21, the drive device (not shown) moves up and down so that the top of the stacked printing papers 32 is always in contact with the calling roller 10 with a pressing force within an appropriate range (a range in which the printing papers 32 can be conveyed). To be made. In addition, the paper feed table 12
As shown in FIGS. 20 and 21, there is a pair of paper feed side plates 13 that move according to the size of the printing paper 32 to be stacked, and a rack (not shown) and a pinion mesh with each other to feed paper on one side. Manually set the paper side plate 13 to the printing paper 32.
According to the size of the paper feed side plate 1 of the other side
3 also moves, and at the position that matches the paper size, the paper feed side plate 1
Position 3 is set.

In FIG. 19, a paper feeding device 93 includes a paper feeding roller 9 and a paper feeding roller shaft 9a which are rotatably supported by side plates 21 and 22 (see FIG. 21) of the main body of the device via a paper feeding roller shaft 9a. A calling roller 10 swingably supported by a supporting member serving as a fulcrum, an endless belt 11 connecting the rollers 9 and 10 and a feed roller 9 which are pressed against each other to prevent double feeding of printing sheets. A separation roller 8; a pair of feed rollers 6 rotatably supported by the side plates 21 and 22 at the front position in the paper transport direction; and a pair of guide plates 7 for guiding the printing paper 32 to the nip portion of the feed roller 6. Etc.

The paper feed roller 9 is shown in FIGS.
As shown in FIG. 3, the paper feed roller shaft 9a is rotatably supported by the side plates 21 and 22, and is covered with a cover A pivotally attached to the paper feed roller shaft 9a. Cover A
Also pivots the calling roller 10. The paper feed roller 9 includes a cam (not shown) that rotates in synchronization with the print drum device 1, a fan gear having a cam follower that engages with the cam, and a paper feed gear that incorporates a one-way clutch or the like. Can be rotated in the direction of. Similarly, the feed roller 6 includes a cam (not shown) that rotates in synchronization with the print drum device 1, a fan-shaped gear having a cam follower that engages with the cam, and a feed roller gear incorporating a one-way clutch or the like. The lower side of is rotated counterclockwise. The paper feed speed of the feed roller 6 is set to be the same as the peripheral speed of the print drum device 1.

The printer main body includes the above-mentioned members, an upper cover 23 covering the above, a paper feed unit cover 24 covering the side of the paper feed tray side, and a paper feed unit cover 24 as members surrounding the apparatus. Paper ejection unit cover 2 that covers the paper ejection tray 17 at the opposite position
5, side covers 26 and 27, side plates 21 and 22 provided in a direction intersecting the paper feed unit cover 24 and the paper discharge unit cover 25
Is covered with a bottom cover 44 and the like which are connected at the bottom. These covers are detachable from the main body of the printing machine.

In FIG. 19, reference numeral 14 is a paper feeding front plate, reference numeral 20 is a plate discharging device, reference numeral 44 is a bottom cover, and reference numeral 94 is a fan provided below the paper discharging and conveying belt 15.

Next, the procedure for conveying the printing paper 32 will be described. In FIG. 19, a paper feed roller 9 and a call roller 1
The printing paper 32 fed by the rotation of 0 is prevented from being double-fed by the feeding roller 9 and the separation roller 8, and only the uppermost one is fed to the feed roller 6. This printing paper 32
As shown in FIG. 24, the tip of the sheet collides with the nip portion between the feed rollers 6 and is further conveyed to form a predetermined amount of curved slack 43 upward as shown in FIG. Then, the rotations of the sheet feeding roller 9 and the calling roller 10 are stopped.

Thereafter, the feed roller 6 is rotated at a predetermined timing by the cam, and the curved slack 43 of the printing paper 32 disappears as shown in FIG. When the one-way clutch is incorporated and the paper feed roller 9 and the calling roller 10 which are rotatable in the paper transport direction are driven to rotate by the transport of the print paper 32, the print paper 32 is transported to the ink application transport device 92.

As shown in FIG. 27, the feed roller 6 conveys the print sheet 32 between the press roller 3 and the outer peripheral surface of the print drum device 1, and at the same time, the press roller 3 is attached to the outer peripheral surface of the print drum device 1. Is pressed by. At the time of this pressing, the ink that has passed through the perforation portion of the stencil master attached to the outer peripheral surface of the printing drum device 1 is transferred,
Printing is performed. The printing paper 32 to which the ink is transferred is
As shown in FIG. 28, the paper is ejected from the print drum device 1 by the air ejected from the paper ejection claw 16 and its tip,
The sheet is conveyed to the sheet discharge tray 17 by the sheet discharge conveyor belt 15, and the printing is completed.

In such a printing machine, the following sources are recognized as the sources of the above-mentioned noise. In FIG. 24, when the leading edge of the printing paper 32 conveyed by the rotation of the paper feed roller 9 collides with the nip portion between the feed rollers 6, the paper collision sound generated by vibrating the printing paper 32 (indicated by the symbol in FIG. 24). a.). In FIG. 26, when the feed roller 6 rotates in accordance with the rotation timing of the print drum device 1 and the curved slack 43 formed on the print paper 32 disappears, the paper feed roller 9 does not rotate. As a load, the printing paper 32 is stretched, and vibrates to generate a paper tension sound (indicated by symbol b in FIG. 26). In FIG. 27, a printing pressure sound generated when the press roller 3 is intermittently collided with the printing drum device 1 at the time of printing paper conveyance timing during printing (indicated by a symbol c in FIG. 27).

In FIG. 28, after printing, a paper ejecting claw air sound generated when air is ejected from the tip of the paper ejecting claw 16 for peeling the printing paper 32 from the outer peripheral surface of the print drum device 1 (in FIG. 28, This is indicated by the symbol d).

A driving sound generated by the meshing of the transmission gear systems of the driving devices 30 and 31 and the intermittent contact between the cam and the cam follower.

Of the noises in the above-mentioned printing press, the sound source with the highest contribution rate is the paper-crashing sound, the paper-tensioning sound, and the like, which is the sound of the paper feeding system, about 40%. , In order of impression pressure. As measures against the above noise,
(1) Sound source measures that reduce the sound generated by the sound source itself,
(2) Anti-vibration measures for solid vibration transmission system, (3) Vibration suppression measures for solid vibration transmission system, (4) Sound absorption measures for air vibration transmission system, (5) Air vibration transmission Five measures such as sound insulation measures for the system can be considered, but of these measures, the sound source measure (1) is most effective in reducing noise.

As a measure against the sound source, the collision speed of the printing paper 32 is lowered or the pulling speed is lowered within a printable range.
To reduce the impact speed of the press roller 3 with respect to the printing drum device 1 to reduce the kinetic energy, to change the gear reduction method to the belt reduction method as a vibration damping measure, and as a sound absorption countermeasure, a sound absorbing material should be installed inside the printer body. Pasting, etc. can be mentioned respectively.

However, it is difficult to obtain sufficient noise prevention even with these measures. The reason is that there is an opening provided in the printer body. The printer body has a paper feed opening 28 for paper feed and paper discharge.
And a paper discharge opening 29 is formed. In addition to the above-mentioned function, such an opening cannot be completely closed because it has an area necessary for removing jammed paper and performing maintenance. Therefore, noise from the inside of the printing machine main body often leaks through the opening.

In particular, as described above, the leakage of the air ejecting claw air sound and the above-mentioned printing pressure sound having the second highest noise contribution rate from the paper ejection opening 29 is remarkable. Therefore, the ratio of these noises leaking from the paper discharge opening 29 is higher than the leakage from the paper feed opening 28.

Therefore, in order to prevent noise from leaking from the openings of these printing machines, for example, the actual Kaihei 3-931 is used.
There is a structure described in Japanese Patent No. 30. As shown in FIG. 29, the configuration described in the above publication has a paper feed soundproof device 33 and a paper discharge soundproof device 3 in the paper feed opening 28 and the paper discharge opening 29, respectively.
4 is provided. The paper feed soundproof device 33 is provided on the paper feed stand 12.
A fixed cover 35 attached to the machine frame at the lower part of the
The fixed cover 35 includes an opening / closing cover 37 pivotally supported by a pivot 36. Reference numeral 38 indicates the opening / closing handle.

The paper discharge soundproof device 34 includes a fixed cover 39 attached to the machine frame at the lower part of the paper discharge tray 17, and an opening / closing cover 41 pivotally supported by the fixed cover 39 by a pivot 40.
The reference numeral 42 indicates a handle for opening and closing.
The other members having the same functions as the members of the printing machine shown in FIGS. 19 to 28 are designated by the same reference numerals.

[0031]

However, in the configuration described in the above publication, by shielding the opening of the printing press main body, noise that is about to leak from the inside of the printing press main body is blocked, and the noise to the outside is blocked. Although the leakage of noise is suppressed,
In addition to the large size of the structure for shielding, the structure itself is complicated, and the operation for loading and unloading printing paper is troublesome, and a space for opening and closing is provided around the printer body. There is a possibility that a new problem arises in that the installation area of the printing press main body becomes large because of the necessity.

Further, when the opening is shielded for soundproofing, there is a risk that the printing paper having curls or waviness may not be conveyed, and the opening may be blindly blocked or the printing paper may be blocked. At present, it is not possible to block the transport path.

In view of the above-mentioned problems in the image forming apparatus such as the conventional printing machine, the object of the present invention is to effectively prevent noise from leaking from the opening provided in the image forming apparatus without impairing the conveyance of the printing paper. It is an object of the present invention to provide an image forming apparatus including a soundproof device that suppresses the installation area of the image forming apparatus and suppresses the installation area of the image forming apparatus.

[0034]

In order to achieve this object, the invention according to claim 1 is such that a master is wound around a plate cylinder, and printing paper conveyed one by one by a paper feeding device is placed on the plate cylinder. pressed toward, after transferring the image by transferring ink to the printing paper, an image forming apparatus for transporting direction to discharge toward the printing paper discharge tray is discharged toward the paper discharge tray A discharge port formed in a shape corresponding to the discharge mode of the printing paper, and located on the upstream side of the discharge tray in the transport direction of the print paper, and forms the discharge port by itself, In the image forming apparatus including a cover that covers a region other than the paper discharge port ,
Inside the paper discharge port in the transport direction of the printing paper,
For printing the image transferred with ink from the plate cylinder
The suction transport device that suctions and transports paper, and the suction transport device
It is placed on the downstream side in the transport direction of the printing paper that is transported by
Has a placement surface for the printing paper, and
By setting the inclination of both ends in the width direction of the printing paper
Shape the above printing paper into a reverse arch or other shape.
And a posture setting unit configured to set a discharge mode . According to a second aspect of the invention, in the image forming apparatus according to the first aspect, the cover is itself.
At least the upper edge of the paper discharge port formed by
Position along the inclination of the mounting surface of the printing paper in the fixed part
It is characterized by making it .

According to a third aspect of the present invention, the master is wound around the plate cylinder, and the printing paper conveyed one by one by the paper feeding device is pressed toward the plate cylinder to transfer the ink to the printing paper. In the image forming apparatus that conveys the image in the discharge direction toward the discharge tray after transferring the image, the print sheet is formed into a shape according to the discharge mode of the print sheet discharged toward the discharge tray. A discharge port that is present, and a cover that is located on the upstream side of the discharge tray in the transport direction of the printing paper, forms the discharge port by itself, and closes a range other than the discharge port, The cover is divided into a lower portion that covers the lower portion of the sheet discharge port and an upper portion that covers a range other than the opening corresponding to the sheet discharge port.

According to a fourth aspect of the present invention, the master is wound around the plate cylinder, and the printing paper conveyed one by one by the paper feeding device is pressed toward the plate cylinder to transfer the ink to the printing paper. In the image forming apparatus that conveys the image in the discharge direction toward the discharge tray after transferring the image, the print sheet is formed into a shape according to the discharge mode of the print sheet discharged toward the discharge tray. A suction conveyance device for sucking and conveying the printing paper on which an image is transferred by the ink from the plate cylinder, and a suction conveyance device. The printing paper is arranged on the downstream side in the transporting direction of the printing paper conveyed by the apparatus, has a mounting surface for the printing paper, and the printing paper is set by setting inclinations of both ends in the width direction of the printing paper on the mounting surface. Reverse the shape of And a posture setting unit configured to set a discharge form, and is positioned upstream of the paper discharge tray in the transport direction of the printing paper and forms the paper discharge port by itself. The cover includes a cover that closes a region other than the discharge port, and the cover covers a lower part of the discharge port below the cover, and an upper part of the cover that faces the placement surface of the print sheet in the posture setting unit and closes the upper part thereof. It is characterized in that it is divided into two parts.

According to a fifth aspect of the present invention, in the image forming apparatus according to the fourth aspect , the upper portion of the cover is
A cover is placed between the posture setting section and the placement surface of the printing paper.
The present invention is characterized in that the upper part is closed from the leading end positioned with a gap that allows the passage of the printing paper that is curled or wavy.

The invention according to claim 6 is the invention as defined in claims 1, 3 , and 4.
Alternatively, in the image forming apparatus described in any one of 5 ,
The cover is characterized in that it is provided with a guide portion having an inclination angle which forms a tapered space in the portion located above the upper surface of the printing paper as it goes downstream in the transport direction of the printing paper.

The invention according to claim 7, claim 1 or 4
In the image forming apparatus described above, the posture setting unit includes a sound insulation cover that is fixed with a gap for passage of the printing paper formed at a position corresponding to a downstream side in the transport direction of the printing paper. I am trying.

According to an eighth aspect of the present invention, the master is wound around the plate cylinder, and the printing paper conveyed one by one by the paper feeding device is pressed toward the plate cylinder to transfer the ink to the printing paper. In the image forming apparatus that conveys the image in the discharge direction toward the discharge tray after transferring the image, the print sheet is formed into a shape according to the discharge mode of the print sheet discharged toward the discharge tray. A first cover structure which is located on the upstream side of the paper discharge port and the paper discharge tray in the transport direction of the printing paper, forms the paper discharge port by itself, and closes a region other than the paper discharge port. And a second cover structure that is located closer to the plate cylinder than the first cover structure and covers above the transport path for the printing paper, and the first and second cover structures.
And a third cover structure which is disposed between the cover structure and the cover structure so as to face the conveyance path of the printing paper and connects the two cover structures with each other. It is characterized in that the space portion formed by the third cover structure is configured as a sound deadening portion.

[0041]

According to the first aspect of the present invention, the area other than the sheet discharge port is covered with the cover in the main body of the apparatus, so that the leakage of noise from the main body of the apparatus is prevented.

According to the first aspect of the present invention, the posture of the printing paper is prevented from sagging due to the increased bending rigidity in the conveyance process by the suction conveyance device and the posture capable of performing good suction to the suction conveyance device. Is set to.

According to the second aspect of the present invention, the leakage of noise can be prevented by blocking the upper part of the printing paper regardless of the change in the posture of the printing paper.

According to the third aspect of the present invention, since the cover provided for preventing the leakage of noise is divided, a jam inside the device is opened by opening the upper portion of the divided cover. Operations such as release processing can be performed.

According to the fourth aspect of the present invention, regardless of the tilted state of the posture setting unit, the noise above the printing paper placement surface of the posture setting unit is covered so that the noise that is about to leak from the discharge port is blocked. You can

According to the fifth aspect of the present invention, it is possible to block the noise that leaks from above the mounting surface while allowing the curl or wavy printed paper to pass through.

According to the sixth aspect of the invention, the leading edge of the curled or corrugated printing paper can be guided and reliably moved toward the paper discharge port.

According to the seventh aspect of the present invention, even if the shape of the paper discharge port is formed to have a size corresponding to the inclination of the placement surface of the printing paper in the posture setting section and noise is likely to leak, It is possible to block the leakage of noise inside the main body of the apparatus rather than the paper discharge port.

In the eighth aspect of the present invention, since the muffling portion is formed by the space portion formed by the first to third cover structures, the noise that has penetrated into this muffling portion is effectively diffused and silenced. To be done.

[0050]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. In addition, in the embodiment shown below, FIG.
29, the same components as those of the printing machine described above are designated by the same reference numerals, and detailed description thereof will be omitted. Figure 1
FIG. 1 is a schematic diagram showing a first embodiment of the present invention. The image forming apparatus according to the present exemplary embodiment includes a suction / conveyance device 46 and a cover 60 as main parts. Suction transport device 46
Is discharged by the ejecting claw 16 whose tip approaches the outer peripheral surface of the printing drum device 1 and the air blown from the tip of the ejecting claw 16.
Printing paper 32 separated from the outer peripheral surface of the printing drum device 1
Is a device for conveying the sheet toward the sheet discharge tray 17. Therefore, the suction / conveyance device 46 is equipped with the suction box 55 and the discharge conveyance belt 15. The suction box 55 is composed of a box body, and a flat face plate 50 having a large number of suction holes is provided on the upper surface thereof. A fan 47 is attached to the lower surface of the suction box 55 to suck outside air from above the face plate 50. Such a suction box 55 is arranged between the facing portion of the printing drum device 1 and the press roller 3 to the paper discharge tray 17, and is inclined along the inclination angle of the paper discharge tray 17. As a result, the printing paper 32 peeled from the outer peripheral surface of the printing drum device 1 does not have different inclinations of the transport path until it falls into the paper discharge tray 17, and therefore, unnecessary air resistance is exerted at the leading end in the transport direction. You can move without receiving.

The suction / conveyance device 46 conveys the printing paper 32 from the position where the printing paper 32 is separated from the outer peripheral surface of the printing drum device 1 toward the paper ejection tray 17 (see FIG. 2).
2), the paper discharge conveyor belt 15 is provided around a pair of pulleys 51 arranged along the conveyor direction in FIG. A large number of holes penetrating in the thickness direction are formed along the extending direction.

By the way, the above-mentioned suction and conveyance device 46 is provided with a jump base 49 which constitutes an attitude setting section for setting the attitude of the printing paper 32. The jump base 49 is for changing the discharge form of the printing paper 32 by adjusting the inclination of both ends in the width direction of the printing paper 32 with respect to the horizontal plane, and in particular, the rigidity of the printing paper 32 against bending is changed. It is provided so as to adjust the so-called stiffness of the waist, and to make the printing paper 32 in a state of being easily brought into close contact with the paper discharge conveyance belt 15. Therefore, the jump base 49 has a mounting surface for the printing paper 32 formed of a plate member, and the inclination angles of the mounting paper on both ends in the width direction of the printing paper 32 can be changed in a plurality of steps. It has become. The jump base 49 shown in FIG. 2 has an inclined surface formed by bending the positions corresponding to both widthwise end portions of the printing paper 32 upward, but the shape is not limited to such a shape, and the angle is a flat surface. It is also possible to change.

A structure for changing the angle of the mounting surface of the printing paper 32 on the jump table 49 in a plurality of steps (hereinafter, referred to as
For the sake of convenience, the variable angle mechanism is shown) in FIG. In FIG. 3, the angle varying mechanism includes an operating lever 56,
A stay 57 and a lift lever 58 are provided as main parts. The base of the operation lever 56 is swingably supported by an arm 59 fixed to the side plate 48 of the suction conveyance device 46, and its swing end is integrated with the stay 57. Such an operation lever 56 is used for the printing paper 32.
The swing position is selected according to the size, thickness and type of the paper. In this embodiment, the standard position of B4 size or less and the position of thick paper for A3 size or relatively strong paper are selected. It can be rocked to.

The stay 57, which is integrated with the swing end of the operating lever 56, extends in the direction perpendicular to the conveying direction of the printing paper 32, and a part of the stay 57 projects toward the inclined surface of the jump base 49. 57A is formed, and this link portion 5
One end of an elevating lever 58 is connected to 7A. As a result, when the stay 57 interlocks with the swing of the operation lever 56, the link portion 57A swings, and the connecting position with the elevating lever 58 can swing.

The other end of the elevating lever 58 is connected to a bracket 49A which is integrated with the mounting surface of the jump base 49, and by pushing and pulling the widthwise outer lower surface of the jump base 49 when it is raised and lowered. The inclination angle of the mounting surface of the printing paper in the width direction of the jump base 49 is changed.

The change in the inclination angle of the jump table 49 is shown in FIG.
And shown in FIG. That is, FIG. 4 shows a state where the operation lever 56 is selected at the standard position, and in this state, the elevating lever 58 is pushed upward. As a result, the jump base 49 has a large inclination angle of its mounting surface. The swinging operation of the operation lever 56 to such a standard position is performed on a relatively thin print sheet having a low stiffness or a print sheet having a small size of B4 or smaller. In the case of the paper indicated by reference sign f in FIG. 4, since the mounting surface of the jump base 49 is steeply inclined and both ends in the width direction are lifted upward to form an inverted arch shape, the rigidity against bending can be increased. it can. By increasing the rigidity against bending of the printing paper 32 and increasing the rigidity of the printing paper 32, even when the printing paper 32 is ejected onto the paper ejection tray 17 and protrudes from the paper ejection port 61, the tip of the printing paper 32 is It can be dropped without hanging. FIG. 5 shows a case where the printing paper is thick or a large printing paper of A3 size is conveyed. In this case, the operation lever 56 is selected to the thick paper position.
As a result, the elevating lever 58 pulls down the mounting surface of the jump base 49 from the position indicated by the symbol i to the position indicated by the symbol h in FIG. 5, so that the mounting face of the jump platform 49 is substantially horizontal. Set to state. Therefore, the thick paper or the large-sized printing paper 32 approaches the horizontal state unlike the case indicated by the reference sign g in FIG. 4, which makes it more susceptible to the suction force of the suction box 55 and the fan 47. .

Next, the cover 60 will be described. In FIG. 1, the cover 60 is arranged on the upstream side of the paper discharge tray 17 in the conveyance direction of the printing paper 32 (the direction of the arrow in the drawing) and on the one downstream side of the pulley 51 around which the paper discharge conveyance belt 15 is wound. Has been done. The cover 60 is the plate discharge device 2
0 to the bottom cover 44 of the printing machine main body is the occupation range in the vertical direction, and the side plates 20, 21 (see FIG. 2).
3)) and is configured by a flat plate member whose size is set as a laterally occupied range, and is detachably attached to the bottom cover 44 and the side plates 20 and 21 by fastening or the like. . Such a cover 60 is formed of a translucent acrylic resin, and is capable of detecting a jam of the printing paper 32 in the transport path. Further, on the surface of the cover 60 facing the suction conveyance device 46, a sound absorbing material 62 made of a foam material is attached to a surface other than the area where the jam detection window is formed. As the sound absorbing material 62, VD foam (made by Bridgestone Co., Ltd .: trade name) having a thickness of 10 mm or 20 mm, which is made of urethane foam-based material, is used. 2 mm thick LR damper (manufactured by Bridgestone Co., Ltd .: trade name).

A discharge port 61 is formed in a part of the cover 60. The paper discharge port 61 is set in the shape shown in FIG. 6 in consideration of the usage environment of the printing machine and the conditions of the type and thickness of the printing paper. That is, in the shape of the central portion 61 b of the paper discharge port 61 to which the face plate 50 of the suction box 55 corresponds, the lower boundary line between the cover 60 located on the bottom surface side of the face plate 50 and the paper discharge port 61 is the face plate 50. From the bottom x1 = 1
A cover 60 that is located 3 mm apart and is located on the upper surface side of the face plate 50.
And the upper boundary line between the paper discharge port 61 and the upper surface of the surface slope 50 is z =
It is set so as to be 7 to 10 mm apart, and both boundary lines are parallel to each other along the face plate 50. On the other hand, of the paper exit 61,
The shape of both end portions 61a corresponding to both ends in the width direction on the printing paper mounting surface of the jump base 49 is such that the inclination angle of the mounting surface of the printing paper 32 of the jump base 49 can be changed in two steps, so that in both cases The lower boundary line between the cover 60 and the discharge port 61 corresponding to the lower part of the jump base 49 to allow the passage of 32 makes the jump base 49 into an inclined angle for thick paper or A3 size, that is, a substantially flat shape. When the corresponding moderate state (state shown by reference numeral h in FIGS. 5 and 6) is targeted, x1 = 1 to 3 mm away from the bottom surface of the jump base 49, and the angle of the mounting surface of the jump base 49 is set. The cover 6 which is parallel and corresponds to the bottom surface of the face plate 50
The shape is set so as to intersect with the lower boundary line between 0 and the paper discharge port 61. Further, the upper boundary line between the cover 60 and the sheet discharge port 61 corresponding to the upper part of the jump base 49 is when the position of the jump base 49 is in a state where the inclination angle indicated by the symbol i in FIGS. 5 and 6 is large. , Y1 = 5 to 7 mm away from the top surface of the jump base 49, and the radius of curvature R = 150.
An arc of up to 180 mm is set so as to come into contact with a horizontal upper boundary line between the cover 60 and the sheet discharge port 61 corresponding to the upper surface of the face plate 50. As a result, the upper edge of the paper discharge port 61 is located along the inclination angle of the mounting surface of the jump base 49. In FIG. 6, the symbol v indicates the amount of movement of the mounting surface of the jump table 49 when the jump table 49 is changed in two steps. Further, the shape in the width direction of the paper discharge port 61 is set to L = 305 to 310 mm in order to allow the maximum size A3 size printing paper 32 among the printing paper 32 to pass through. The discharge port 61 formed in such a shape can pass any of the types of printing paper used for printing, and the printing paper 32 that passes through is the minimum required so that only one sheet can pass through. Because it has a limit size,
It is possible to block noise from the inside of the main body of the printing machine, for example, leakage of paper ejecting claw air sound and printing pressure sound.

Since this embodiment has the above-mentioned structure,
It is possible to prevent noise from leaking from the paper discharge port 61 inside the printer body. The inventor obtained the results shown in Table 1 when the noise level was measured using the printing machine having the above configuration.

[0060]

[Table 1]

As is clear from Table 1, the first aspect of the present invention
According to the embodiment, the noise level can be reduced by about 2 to 6 dB (A) as compared with the conventional printing machine. Note that dB (A) is stipulated in ISO or JIS to be measured using a frequency filter called A characteristic in order to take the frequency characteristic of the human ear into consideration when measuring the noise level, This is a display in which a symbol (A) is added in order to make it clear that the noise level is the one in which the A characteristic filter is introduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that a cover having a paper discharge port is divided into a lower part and an upper part, and one of the upper parts is swingably provided. Cover 60
Is divided into two parts, an upper part and a lower part, based on the position of the paper discharge port 61, and the cover 601 located in the lower part is
The range from the position facing one of the pulleys 51 around which the discharge conveyance belt 15 is wound up to the bottom cover 44 is defined as the occupied range in the vertical direction, and the cover 602 located in the upper part is located.
Is a dimension (w = 20 to 80 m) shown by a symbol w in FIG. 8 in a part of the lower cover 601 near the upper end.
m) is the overlapping range to the lower surface of the plate discharge device 20 as the occupied range in the vertical direction. The cover 601 located in the lower portion is formed of a steel plate that is a material having a large transmission loss that exhibits sound insulation performance, and is detachably supported by the bottom cover 44 by fastening or the like.
As described above, the transmission loss means the difference in sound pressure level between the incident wave and the transmitted wave in the sound insulation structure (sound insulation material) as shown in FIG. 30, and it is said that the larger the transmission loss, the better the sound insulation. There is. As a method of measuring the transmission loss, JIS
"A" 1416 "Measurement of sound transmission loss in the laboratory"
based on.

The cover 602 located in the upper portion is the first
It is formed of the same material as the cover 60 described in the embodiment, the base is swingably supported by the rotating shaft 63, and the paper discharge port 61 is formed in the vicinity of the position overlapping the cover 601 located in the lower portion. ing.
The portion where the paper discharge port 61 is formed is bent toward the suction conveyance device 46 side. The bent portion 602A is set such that its inclination is such that the space above the suction conveyance device 46 tapers toward the downstream side in the conveyance direction (arrow direction in the drawing) of the printing paper 32. As a result, the printing paper 32 conveyed by the suction conveyance device 46 is guided along the angle of the bent portion 602A even if the leading end is curled or wavy, so that the printing paper 32 is accurately guided to the paper ejection port 61. You can move towards. The above-described curl and waviness of the printing paper 32 occur due to the ink used for printing. In other words, the ink used is an emulsion type with less evaporation of water, and when this ink is used, the water content in the ink permeates into the printing paper and the water content varies across the printing paper. There are areas that are easy to dry and areas that are not, resulting in curling and waviness.

A magnet receiver 67 is fixed to the outer surface of the cover 602 located in the upper part which overlaps with the cover 601 located in the lower part, near the base part of the cover 601. The magnet 64 fixed to the paper discharge unit cover 25 of the main body can be magnetically attracted. A grip 66 is provided on the outer surface of the upper portion of the cover 602 on the swinging end side. It should be noted that the covers 602, 60 located in the upper and lower parts
In the surface facing the suction conveyance device 46 side in No. 1,
Similar to the embodiment, the sound absorbing material 62 and the damping material are provided respectively. Also, the cover 6 located in the upper part
The shape of 02 in the paper width direction is set to be U-shaped in a front view shape including the tip of the bent portion 602A corresponding to the position indicated by the symbol j.

Since this embodiment has the above-mentioned structure,
When the printing paper 32 is ejected, the cover 602 located in the upper portion is maintained in a state of overlapping with the upper end of the cover 601 located in the lower portion, as shown by the solid line in FIG. 7. As a result, the suction conveyance device 46
The printing paper 32 conveyed by is guided by the bent portion 602A of the cover 602 having its leading end located in the upper portion, and is ejected toward the paper ejection tray 17.

When the printing paper 32 is jammed or for maintenance or the like, the cover 602 located at the upper portion is used.
However, it is swung while holding the handle 66. Swinging cover 60
2, the magnet receiver 67 is attracted to the magnet 64, so that the attraction / conveyance device 46 is indicated by a chain double-dashed line in FIG.
The upper space of the can be opened and it is possible to insert a hand into this space.

According to this embodiment, the printing paper 32 can be opened by opening and closing a part of the cover that closes the periphery of the paper exit 61.
Jam handling and maintenance are easy to perform, and when closed, it has only the minimum necessary opening, so that noise leakage from inside the printing machine can be suppressed inside the printing machine. In this example, the result of measurement of the noise level is the same as in the case of the first example described above, and the result shown in Table 1 is obtained, which is 2 to 6 dB (A) lower than that of the conventional example. I was able to do it.

Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that the cover 602 located in the upper portion shown in the second embodiment is a cover 6020 provided so as to be able to move up and down by a swinging method. The cover 60 located in the upper part shown in the second embodiment.
One end of a tension spring 75, which is hung between the upper end of 20 and an immovable part in the main body of the printing machine, is hooked, whereby the cover 6020 is given a habit of moving upward.
This movement is guided by the sliding shafts 63 and 69 provided at the upper and lower ends of the cover 6020 entering into the longitudinal slots formed in the immovable portion of the printer body. ing. A claw 70 is provided on the surface of the cover 6020 in the vicinity of the paper discharge port 61, the surface facing the suction and conveyance device 46. The pawl 70 is normally locked by a stopper 73, which allows the cover 602 to be released.
0 is prevented from moving to the upper part. Stopper 73
Is a member that can be swung with a support shaft 71 installed in an immovable portion in the printer body as a fulcrum.
A locking piece for locking 0 is formed. Such a stopper 73 has one end of a compression spring 74 hooked between its swing end and an immovable portion in the main body of the printing machine, and imparts the habit of constantly displacing the locking piece toward the claw 70. ing. Further, a short shaft 72 is arranged between the support position of the support shaft 71 in the stopper 73 and the locking piece, and one end of an operation rod 76 protruding to the outside of the printing machine is connected to the short shaft 72. Has been done. Further, a grip 66 is provided on the outer surface of the cover 6020 near the lower end. All of these components are provided near the side plates 21 and 22 (see FIG. 21) of the printing machine main body at a position deviated from the position of the paper discharge port 61 so as not to interfere with paper discharge. ing.

Since this embodiment has the above-mentioned structure,
When the printing paper 32 that has undergone the image processing is discharged,
The state shown in FIG. 9 is set. In this state, the cover 6
020 is maintained with its lower end overlapping the upper end of cover 601. That is, the cover 6020
The pawl 70 is locked by the locking piece of the stopper 73, and is prevented from moving upward.

On the other hand, when the space on the side of the paper discharge tray 17 in the suction and conveyance device 46 is opened, the operation rod 76 is pushed. When the operation rod 76 is pushed in, the support shaft 71
The stopper 73 swings around the fulcrum, the locking piece is disengaged from the claw 70, and the cover 6020 is moved upward by the urging force of the tension spring 75. As a result, as shown in FIG. 10, the cover 6020 moves upward until the bent portion 602A abuts the lower surface of the plate discharge device 20, and opens the discharge side space of the suction conveyance device 46.

According to this embodiment, as in the second embodiment,
By providing the openable / closable cover 6020, it is possible to prevent noise leakage from the inside of the printing press main body when the cover 6020 is closed, and when the cover 6020 is opened, The jamming or maintenance of the printing paper 32 can be easily performed. Moreover,
When the cover 6020 is opened, the cover 6020 can be moved within the printing machine body without jumping up around the printing machine body as in the second embodiment.
There is no need to provide a space for opening the cover 6020. This makes it possible to reduce the number of components protruding from the main body of the printing machine and to eliminate the members protruding around the main body of the printing machine, thereby eliminating the presence of a member that interferes with the operation by the operator.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, of the two divided covers described in the second and third embodiments, the cover located in the upper portion is parallel to the face plate 50 of the suction box 55 on the printing paper placement surface of the jump base 49. It is characterized in that it is arranged so as to face above the mounting surface.
That is, as described above with reference to FIG. 2, the placement surface of the printing paper 32 on the jump base 49 may have bent portions at both ends in the width direction of the printing paper 32. In this case,
Both ends in the width direction of the printing paper 32 are bent back by this bent portion, and the printing paper 32 is set to have a U-shape. However, in front of the mounting surface having the bent portion, the face plate of the suction box 55 is formed. It is parallel to 50. Therefore, in the present embodiment, as shown in FIG. 11, the cover 603 is arranged above the suction conveyance device 46 so that the leading end is located at a position where a space (t) is set from the upper surface of the paper ejection conveyance belt 15. ing. As a result, the cover 603 closes the area in the vertical direction above the paper discharge conveyance belt 15 except the interval (t). The interval (t) described above is 2 to 5 m in order to allow passage of the printing paper 32 that is curled or wavy.
It is set to m. Unlike the cases of the second and third embodiments, the cover 603 does not have a paper discharge port in a part thereof, but the cover 603 allows the printing paper 32 to pass through due to the interval (t) set between the cover 603 and the face plate 50. It is designed to form a paper section. For this reason, since the above-mentioned interval (t) is arranged with respect to the upper surface of the paper discharge conveyance belt 15 which is parallel to the face plate 50 of the suction box 55, as shown in FIG. 12, the print paper corresponding to the paper discharge port is formed. The area of the opening required for passing 32 sheets can be made extremely small. The cover 603 is a third
As in the case of the embodiment, it is swingably provided with the base portion as a fulcrum, and it is possible to close the position in the vertical direction except the position where the space above the suction conveyance device 46 is opened and the above-mentioned interval (t). It can be swung into and out of position.

The cover 603 displaced to the position where the space above the suction and conveyance device 46 is opened has a magnet receiver 79 (this magnet receiver 79 also serves as a handle in this embodiment) as in the case of the third embodiment. Is held by the magnet 80 located on the lower surface of the plate discharge device 20 to maintain its position, and the magnetic attraction from the magnet 80 is released by the operator's hand, so that its tip is attracted. The position is set so as to face the upper surface of the transfer device 46. As the structure of the swing end of the cover 603,
As in the case of the third embodiment, as the print sheet 32 is conveyed toward the downstream side in the conveying direction (the direction of the arrow in the drawing), the upper surface space of the suction conveyance device 46 is inclined at a taper angle and the front end of the print sheet is discharged. You may make it guide toward the paper tray 17 side. The cover 603 is made of the same material as that of the covers 602 and 6020 of the second and third embodiments described above, and the surface of the cover 603 facing the inside of the printing press main body where the plate cylinder is located. Is equipped with a sound absorbing material 62 and a damping material.

Similar to the cover 601 located in the lower portion shown in the third embodiment, a cover 604 located in the lower portion is arranged on the downstream side of the suction transport device 46 in the transport direction of the printing paper 32. .

The cover 604 in this embodiment is shown in FIG.
As shown in FIG.
Is set at a position about 1 to 3 mm away from the upper surface of the face plate 50 located on the upper surface of the sheet, and the width of the sheet in the horizontal direction (distance indicated by reference symbol M in FIG. 12) allows passage of A3 size printing paper. It has a concave portion set to a possible size of 305 to 310 mm. In the cover 604, as in the second and third embodiments, the sound absorbing material 62 and the vibration damping material are attached to the surface facing the suction conveyance device 46 side.

In the present embodiment, since the cover 603 is installed so as to face the upper surface of the paper discharge conveyor belt 15 which is parallel to the face plate 50 of the suction box 55, the lower edge of the cover 603 is placed on the jump table 49. Since it is possible to make it extremely close to the upper surface of the paper discharge conveyance belt 15 which is parallel to the mounting surface of the printing paper 32, and the depth of the concave portion of the cover 604 can be reduced, the opening area of the above-mentioned gap can be reduced. Can be made extremely small, which can reduce the number of noise leakage points from the inside of the printing press.

Next, the fifth embodiment of the present invention will be described with reference to FIGS.
Examples will be described. The present embodiment is characterized in that a sound insulating cover is provided on the jump base 49 in addition to the structure shown in the second embodiment. That is, as described with reference to FIG. 2, on the jump table 49, a position facing the both ends in the width direction of the printing paper 32 on the upstream side of the cover 602 in the transporting direction of the printing paper 32 (the direction of the arrow in the drawing) is defined as a bent portion. ing. Corresponding to the bent portion of the jump base 49, as shown in FIG. 13, a jump base cover 81 as a sound insulation cover is attached. Jump stand cover 8
As shown in FIG. 14, 1 is a jump table 49 on a part thereof.
The front view shape having an opening portion 82 formed of a slit into which the bent portion of FIG. The opening portion 82 is formed to have a minimum size that allows the printing paper 32 to pass therethrough, and as shown in FIG. 15, the upper boundary 81a is a distance y1 = 5 to 7 mm from the upper surface of the inclined surface of the jump base 49. They are separated from each other to be parallel to the angle of inclination of the bent portion, and the lower boundary line 81c is the jump base
It is parallel to the inclined surface of 9. Further, the widthwise length 81b of the opening is set to a length that allows the A3 size printing paper 32 to pass through. In the jump base cover 81 having the opening 82 having such a shape, the position of the lower boundary line of the opening 82 is fixed to the bent portion of the jump base 49, whereby the inclination angle of the bent portion changes. However, it can be displaced together with the bent portion. 15 and 16 show the jump base cover 81 according to the inclination angle of the inclined surface of the jump base 49.
15 shows the state of the jump base 49 shown in FIG. 5, and FIG. 16 corresponds to the state of the jump base 49 shown in FIG.

As is clear from FIGS. 15 and 16, when the jump base 49 is set at the thick paper position, the jump base 49 is inclined with respect to the paper discharge port 61 formed by the cover 601 and the cover 602. Since the angle is gentle (state indicated by symbol h), only the opening area corresponding to the paper discharge port 61 can be obtained, and the other range is closed by the jump base cover 81. Further, when the jump base 49 is in the state shown in FIG. 4, that is, when the jump base cover 81 is set in the standard position, the inclination angle of the jump base cover 81 increases in accordance with the change in the inclination angle of the jump base 49 (the state indicated by the symbol i). ). As a result, only the range through which the printing paper 32 passes is opened with respect to the paper discharge port 61 formed by the cover 601 and the cover 602, and the range other than the opening is closed by the jump base cover 81.

In the present embodiment, even when the shape of the discharge port is enlarged in response to the change of the angle of the placement surface of the printing paper 32 on the jump table 49, the discharge port jumps. Since the open portion of the sheet discharge port can be closed by the jump table cover 81 provided on the mounting surface side of the table 49, the opening area of the sheet discharge port can be minimized. As a result, even when the shape of the paper discharge port is large, noise that tends to leak from the opening of the paper discharge port can be blocked regardless of the inclination state of the mounting surface.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that a space portion is constituted by a plurality of cover structures, and the space portion is used as a sound deadening portion to diffuse and muffle noise. In FIG. 17, the first cover structure is composed of the covers 601 and 602 described in the second embodiment,
The second cover structure is composed of the cover 603 described in the fourth embodiment. The third cover structure is a connection cover that connects the covers 602 located above the first cover structure and the cover 603 forming the second cover structure to each other. It is composed of -83. Third cover structure, which is a connection cover
The 83 is opposed to the face plate 50 of the suction box 55 in the suction / conveyance device 46 in a state where the first and second cover structures are vertically spaced apart from each other by the occupation height of the first and second cover structures. A space is formed with −83 as the ceiling. The cover 603 is formed of a translucent acrylic resin so that the jam of the printing paper 32 can be detected in the conveying path. The cover 603 has a sound absorbing material on the surface facing the inside of the printing machine main body where the plate cylinder is located. 62 and a damping material are attached. As in the case of the fourth embodiment, this cover 603 has its tip located at a position spaced from the upper surface of the paper discharge and transport belt 15 by a distance (t), and blocks the area in the vertical direction other than this distance. There is. As a result, even if the print paper 32 conveyed by the paper discharge conveyor belt 15 is curled or corrugated, it is possible to pass the paper by providing the above-mentioned interval.

Such a space portion constitutes a muffling portion having a space (t) between the cover 603 forming the second cover structure and the upper surface of the sheet discharging and conveying belt 15 as an entrance. The sound deadening part is a part that attenuates the progress of sound waves by interposing a space part having a volume larger than that of the approach path in the sound entry path so as to diffuse the sound waves that are advancing and interfere with each other. is there. FIG. 18 shows this state, and a sound wave (indicated by an arrow) that has entered the muffling section is repeatedly reflected in the space, and part of the sound wave leaks from the space above the cover 602 and the face plate 50 of the suction conveyance device 46. However, most of the rest is attenuated by interference in the space and is absorbed by the sound absorbing materials 62 and 62A provided on the inner surface of the cover. As a result, the relationship between the sound volume P entering the muffling section and the leaking sound volume Q is P> Q, which is larger than the case where the one-stage cover is used as in the above-described embodiments. , Will improve the silencing effect.

Regarding the leaked noise, the inventor of the present invention has the configuration shown in this embodiment, the configuration shown in the first embodiment, and FIG.
The results shown in Table 2 were obtained by comparison with the conventional configuration shown in FIG.

[0083]

[Table 2]

As is clear from Table 2, in the case of the sixth embodiment, it can be lowered by about 3 to 7 dB (A) in comparison with the conventional structure, and the cover is installed in one stage and the cover Compared to the first embodiment in which the paper discharge port 61 is formed, it is 1
It has become possible to reduce the level by about 3 dB (A).

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the gist of the present invention. For example, the soundproofing device of the present invention can be applied to an electrophotographic copying machine, a printer, and the like in addition to the printing machine in the category of the image forming apparatus. When the image forming apparatus requiring soundproofing is an electrophotographic copying machine or printer, the image forming means forms a photoconductor drum device and an electrostatic latent image on the photoconductor drum device. A charging / exposure device, a developing device that visualizes this electrostatic latent image, a transfer device that transfers this visible image to a transfer sheet, a fixing device that fixes the image after transfer, and a paper discharge from this fixing device It includes a paper discharge device that conveys paper to the tray.

[0086]

According to the first aspect of the present invention, since the area other than the sheet discharge port is covered with the cover in the apparatus body, it is possible to prevent the leakage of noise from the apparatus body inside the apparatus body. Therefore, there is no need for a soundproof structure outside the device body. Thus, the installation of the image forming apparatus space - Ki out to prevent a situation such that a larger scan, prevent from sagging been strengthened flexural rigidity posture of the printing sheet in the conveying process by the suction conveying device The posture is set so that the suction / conveyance device can perform good suction. According to the second aspect of the present invention, since it is possible to prevent the leakage of noise inside the main body of the apparatus by blocking the upper side of the printing paper regardless of the change in the posture of the printing paper, the stable conveyance state of the printing paper is set. Even when the posture setting section is provided, it is not necessary to provide the soundproof mechanism outside the apparatus body. As a result, the installation space of the image forming apparatus does not need to be widened. According to the third aspect of the present invention, since the cover provided to prevent the leakage of noise is divided, the jam is released inside the device by opening the upper portion of the divided cover. Operations such as processing can be performed. According to the fourth aspect of the present invention, regardless of the inclination state of the posture setting unit, by covering the upper portion of the posture setting unit above the placement surface of the printing sheet, noise that is about to leak from the paper ejection port is placed. It can be shut off inside the main body of the device where the placement surface is located. This eliminates the need to attach a soundproofing device outside the main body of the apparatus, and the installation space for the image forming apparatus
Can be kept to the minimum necessary.

According to the fifth aspect of the present invention, the opening area above the mounting surface is allowed to pass while the printing sheet having curls and waviness is allowed to pass. Since it can be made small, noise that is about to leak is effectively blocked, so that noise can be prevented in the transport path. As a result, soundproofing can be performed inside the image forming apparatus, so that the installation space of the image forming apparatus does not need to be expanded.

According to the sixth aspect of the invention, the leading edge of the curled or corrugated printing paper can be guided and reliably moved toward the paper discharge port. According to the seventh aspect of the present invention, even when the shape of the paper discharge port is formed to have a size corresponding to the inclination of the placement surface of the printing paper in the attitude setting unit and noise is likely to leak, It is possible to block noise leakage and prevent noise in the main body of the apparatus rather than the paper discharge port. In the invention according to claim 8 , since the muffling portion is constituted by the space portion formed by the first to third cover structures, the noise that has penetrated into the muffling portion can be effectively diffused and muffled. Therefore, the soundproofing inside the main body of the device becomes possible. As described above, also in the seventh and eighth aspects of the present invention, since it is possible to perform soundproofing inside the apparatus main body, it is possible to prevent the situation where the installation space of the image forming apparatus is unnecessarily expanded. .

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a perspective view for explaining a partial configuration of a suction conveyance device used in the embodiment shown in FIG.

FIG. 3 is a perspective view showing a part of the suction conveyance device shown in FIG. 2 in an extracted manner.

FIG. 4 is a schematic view showing an example of a sheet conveyance mode in the suction conveyance device shown in FIG.

FIG. 5 is a schematic diagram showing another example of a paper conveyance mode in the suction conveyance device shown in FIG.

FIG. 6 is a view in the direction of the arrow L1 in FIG.

FIG. 7 is a schematic view showing a second embodiment of the image forming apparatus according to the present invention.

8 is a view taken in the direction of the arrow L2 in FIG.

FIG. 9 is a schematic diagram for explaining a third embodiment of the image forming apparatus according to the present invention.

FIG. 10 is a schematic diagram for explaining one aspect of the embodiment shown in FIG.

FIG. 11 is a schematic diagram for explaining a fourth embodiment of the image forming apparatus according to the present invention.

FIG. 12 is a view in the direction of the arrow L3 in FIG.

FIG. 13 is a schematic diagram for explaining a fifth embodiment of the image forming apparatus according to the present invention.

FIG. 14 is a perspective view for explaining a main part structure of the embodiment shown in FIG.

FIG. 15 shows one mode of the embodiment shown in FIG.
It is the arrow line view shown from the direction shown by code | symbol L4 in a code | symbol.

FIG. 16 shows another embodiment of the embodiment shown in FIG.
It is an arrow view shown from the direction shown by the code | symbol L4 in the inside code | symbol.

FIG. 17 is a schematic diagram for explaining a sixth embodiment of the image forming apparatus according to the present invention.

FIG. 18 is a schematic diagram for explaining one mode of the embodiment shown in FIG.

FIG. 19 is a schematic diagram illustrating an example of an image forming apparatus.

20 is a view taken in the direction of the arrow L5 in FIG.

21 is a cross-sectional view taken along the arrow L6 in FIG.

22 is a cross-sectional view taken along the arrow L7 in FIG.

23 is a view taken in the direction of the arrow L8 in FIG.

FIG. 24 is an explanatory diagram of a sheet feeding operation in a conventional image forming apparatus.

FIG. 25 is an explanatory diagram of a sheet feeding operation in a conventional image forming apparatus.

FIG. 26 is an explanatory diagram of a sheet feeding operation in the conventional image forming apparatus.

FIG. 27 is an explanatory diagram of a sheet feeding operation in a conventional image forming apparatus.

FIG. 28 is an explanatory diagram of a sheet feeding operation in the conventional image forming apparatus.

FIG. 29 is a schematic diagram for explaining an example of a sound insulation structure in the image forming apparatus.

FIG. 30 is a schematic diagram for explaining the principle of transmission loss.

[Explanation of symbols]

1 Printing Drum Device 17 Paper Ejection Tray 32 Printing Paper 46 Suction and Conveyance Device 49 for Printing Paper 49 Jump Stand 50 Face Plates 60, 601, 602, 603, and 604 Cover 61 Above the Suction and Conveyor Cover 61 Ejection Port 62 Sound Absorbing Material 81 Jump Stand cover

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 29/52 B65H 29/70 B41F 13/00 B41F 33/00 B41L 13/04

Claims (8)

(57) [Claims] 1. A master is wound around a plate cylinder, and is fed by a paper feeder.
Press the printing paper conveyed one by one toward the plate cylinder,
After transferring the ink to the printing paper to transfer the image,
An image forming apparatus that conveys the print sheet in a discharge direction toward a discharge tray, the discharge port having a shape according to a discharge mode of the print sheet discharged toward the discharge tray. An image forming apparatus including: a cover located upstream of the paper ejection tray in the transport direction of the printing paper, forming the paper ejection port by itself, and closing a region other than the paper ejection port. At the inside of the paper exit in the transport direction of the printing paper.
Is for printing the image transferred with ink from the plate cylinder.
Suction transport device for suction transport of paper, and transport of the printing paper transported by the suction transport device
Disposed on the downstream side in the direction, having a mounting surface for the printing paper,
The inclination of the widthwise ends of the printing paper on this placement surface
Depending on the setting, the above printing paper can be reversed arched or
Posture setting to set discharge shape by forming in other shapes
An image forming apparatus characterized in that it comprises a part, a. 2. The image forming apparatus according to claim 1, wherein the cover is at least the discharge port formed by itself.
The upper edge is the mounting surface of the printing paper in the posture setting section.
The image forming apparatus is characterized in that it is positioned along the inclination of . 3. A master is wound around a plate cylinder, and is fed by a paper feeding device.
Press the printing paper conveyed one by one toward the plate cylinder,
After transferring the ink to the printing paper to transfer the image,
Convey the above printing paper in the ejection direction toward the ejection tray.
In the image forming apparatus described above,
A discharge port formed in a shape corresponding to the state, and an upstream side of the discharge tray in the transport direction of the print paper.
It is located on the side of the
A cover for closing a region other than the paper discharge port, the cover including a lower portion covering a lower part of the paper discharge port and an upper portion.
In the upper part that covers the area other than the opening corresponding to the paper exit.
An image forming apparatus characterized by being provided separately . 4. A master is wound around a plate cylinder, and is fed by a paper feeder.
Press the printing paper conveyed one by one toward the plate cylinder,
After transferring the ink to the printing paper to transfer the image,
An image forming apparatus that conveys the print sheet in a discharge direction toward a discharge tray, having a discharge port formed in a shape corresponding to a discharge mode of the print sheet discharged toward the discharge tray. , Inside the paper exit in the transport direction of the printing paper
Is for printing the image transferred with ink from the plate cylinder.
Suction transport device for suction transport of paper, and transport of the printing paper transported by the suction transport device
Disposed on the downstream side in the direction, having a mounting surface for the printing paper,
The inclination of the widthwise ends of the printing paper on this placement surface
By setting it, the shape of the above printing paper is made into a reverse arch shape.
And a posture setting unit configured to set a discharge form
Both are upstream of the paper ejection tray in the transport direction of the printing paper.
It is located on the side of the
A cover is provided for closing a region other than the paper discharge port, and the cover has a lower portion that covers a lower portion of the paper discharge port and an upper portion.
Facing the placement surface of the printing paper in the posture setting unit
An image forming apparatus, characterized in that the image forming apparatus is divided into an upper portion that closes the upper portion thereof . 5. The image forming apparatus according to claim 4, wherein the cover sets the width of the printing paper by the attitude setting unit.
Positions before both ends of the direction are tilted with respect to the horizontal plane
The image forming apparatus is characterized in that a portion that closes an upper position of the printing paper is opened and closed . 6. The method of claim 1, 3, in the image forming apparatus of one to <br/> description of the four or five, said cover part located above the upper surface of the printing paper
As the printing paper moves in the downstream direction,
An image forming apparatus comprising a guide portion having an inclination angle forming a narrow space . 7. An image forming apparatus according to claim 1 or 4, wherein the posture setting section of forming a passage for clearance of the printing sheet
The sound insulation cover that has been fixed in place
An image forming apparatus provided at a position corresponding to the downstream side . 8. A master is wound around a plate cylinder, and 1
Press the printing paper conveyed one by one toward the plate cylinder,
After transferring the ink to the printing paper to transfer the image,
Convey the above printing paper in the ejection direction toward the ejection tray.
In the image forming apparatus described above,
A discharge port formed in a shape corresponding to the state, and an upstream side of the discharge tray in the transport direction of the print paper.
It is located on the side of the
A first cover structure that closes a region other than the paper discharge port, and a plate cover that is located closer to the plate cylinder than the first cover structure.
A second cover structure covering the upper side of the conveyance path of the printing paper and the first and second cover structures, and
The cover is placed so as to face the conveyance path of the printing paper,
A third cover structure for connecting the structures to each other, and a space formed by the first to third cover structures.
An image forming apparatus characterized in that the interspace is configured as a muffling section .