JP3007996B2 - Plate cylinder and printing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate cylinder provided with a cylindrical body on which a printing base paper is wound around a peripheral surface and a printing ink is stored, and a printing apparatus using the plate cylinder. Things.

[0002]

2. Description of the Related Art A conventionally known plate cylinder on which a stencil sheet is wound has a non-printing area provided with an ink inlet for injecting ink into the inside and a clamper for gripping an edge of the sheet. And a printing area on which the stencil sheet after stencil making is wound.

The plate cylinder has a cylindrical base made of metal or plastic, which is formed in a net shape by forming a large number of small holes in a peripheral side wall, and silk and cotton wound around the outer peripheral surface of the base. , A cloth screen formed of synthetic fibers or the like.

In this conventional plate cylinder, the printing area corresponds to, for example, Japanese Industrial Standards B row 4 (hereinafter abbreviated as B4 size) and is set slightly wider than that.
Therefore, when printing on a printing paper smaller than the B4 size, a predetermined small printing original is made on a B4 size stencil sheet, and the stencil sheet is wound around the plate cylinder to perform a printing operation. I was

When a smaller stencil sheet is wound around a plate cylinder corresponding to the B4 size and printing is performed, a non-winding area of the stencil sheet is generated in a printing area of the plate cylinder, and the non-winding area is formed. Paper dust adheres to the ink and the ink dries. The press roller that presses the printing paper against the plate cylinder corresponds to the width of B4 size. Therefore, when a small base paper is wound and printed, the press roller directly contacts the non-wound portion of the base paper. The ink adheres to the contact area. In this case, drying of the ink or contamination of the press roller by the ink causes inconvenience when a large-scale printing is executed later.

[0006]

As described above, in the prior art, even when a small printed matter is to be obtained, it is necessary to use a large stencil sheet to make a part of the stencil. Therefore, it was uneconomical.

[0007]

According to a first main aspect of the present invention, there is provided a cylinder body on which a printing base paper is wound and a printing ink is accommodated in a side surface thereof. A surrounding member partially surrounding the circumferential side surface along the circumferential direction of the cylindrical body, the plate member being provided so as to be movable along the circumferential direction of the cylindrical body, Specifically, a printing region and a non-printing region are formed in the cylinder, and the surrounding member selectively switches between a non-printing position surrounding the non-printing region of the cylinder and a printing position surrounding the printing region. It is configured to move.

In a second main invention, there is provided a cylindrical body on which a printing base paper is wound around a peripheral side surface and a printing ink is stored therein, and the cylindrical body is provided along the entire generatrix along the generatrix direction. A plate cylinder in which a surrounding member partially surrounding the circumferential side surface along the circumferential direction is mounted movably along the circumferential direction of the cylindrical body; and a printing base paper after plate making on the plate cylinder. And a paper supply means for supplying printing paper to the plate cylinder, more specifically, one side edge of the surrounding member parallel to the generatrix direction. In the vicinity, a clamper for holding the printing base paper supplied by the base paper supply unit is mounted so as to be openable and closable, and the operation of the paper supply unit is controlled based on the position of the clamper.

[0009]

In the first main invention, the surrounding member which partially surrounds the cylindrical body over the entire area along the generatrix direction and along the circumferential direction of the peripheral side surface is formed in the circumferential direction of the cylindrical body. It is provided so that it can move along.

Therefore, if the circumferential dimension of the printing base paper when it is wound on the plate cylinder is shorter than the circumferential length of the printing area of the printing cylinder, the non-printing of the printing base paper is performed in the printing area of the printing cylinder. A winding area is generated, but when the surrounding member is located above the non-winding area, the non-winding area is surrounded by the surrounding member,
There is no possibility that paper dust or the like will adhere to the non-winding area.

Although the operation of the second main invention is not substantially different from the operation of the first main invention, the base paper supply means is provided near one side edge of the surrounding member parallel to the generatrix direction. When the operation of the paper feeding means is controlled with reference to the position of the clamper, the operation of the paper feeding means is controlled to be openable and closable, regardless of the position of the surrounding member with respect to the plate cylinder. The downstream edge and the downstream edge of the printing paper easily match.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a plate cylinder, FIG. 2 is a front view of the plate cylinder, and FIG. 3 is a front view of the plate cylinder in a state different from FIG. FIG. 4 is a side view of the plate cylinder, and FIG. 5 is a schematic front view of the printing apparatus.

In these figures, reference numeral 1 denotes a cylindrical body having a shape similar to a cylindrical shape, and has a diameter of 210 mm and a length in the generatrix direction of about 350 mm. The non-printing area 2 of the cylindrical body 1 is provided with an ink injecting port 3 for injecting ink into the inside thereof. Alternatively, it is constituted by a plastic base and a cloth screen formed of silk, cotton, synthetic fiber or the like wound on the outer peripheral surface of the base. In the present embodiment, the printing area 4 of the cylindrical body 1 corresponds to the A3 size,
The long side of the A3 size corresponds to the circumferential length, and the short side corresponds to the generatrix length.

A rotary shaft 5 is inserted through and fixed to the cylindrical body 1 at the center of rotation. The cylindrical body 1 is partially extended along the circumferential direction of the peripheral side surface over the entire area along the generatrix direction. A surrounding member 6 is provided so as to be movable in the circumferential direction of the cylindrical body. Specifically, the surrounding member 6 is fixed to driven gears 7 (see FIG. 4) which are non-fixedly (rotatably) fitted to protrusions of the rotating shaft 5 from both side walls of the cylindrical body 1. Is fixed to the fan-shaped holding member 8. In the present embodiment, the holding member 8 is loosely fitted to the rotary shaft 5, but need not necessarily be loosely fitted to the rotary shaft 5, but may be fixed to the side wall of the driven gear 7. The clearance between the inner surface of the surrounding member 6 and the peripheral surface of the cylindrical body 1 is 0.5 mm to 1.5 mm.
Is appropriate.

The surrounding member 6 and a holding member 8 for holding the surrounding member 6 on the rotary shaft 5 or the driven gear 7 are integrally formed of a plastic or metal plate.
In the vicinity of one side edge of the surrounding member 6 parallel to the generatrix direction, a clamper 10 for gripping a downstream edge of a stencil sheet 9 (see FIG. 5) as a printing base sheet is mounted so as to be openable and closable.

In addition, as shown in FIG.
The clamper mounting portion 11 (the grip portion on the downstream edge of the stencil sheet 9) is formed of a rigid body such as metal, and the other portion following the clamper mounting portion 11 is formed of the film 12. Is also good.

A fan-shaped holder 13 as a position changing means for changing the relative position of the surrounding member 6 with respect to the cylindrical body 1 is fixedly mounted (rotatably) on the rotating shaft 5.
An arcuate sector gear 14 is fixed around the holder 13, and the sector gear 14 is
And is meshed with a drive gear 17 of a position changing motor 16 which is held by the motor.

A driving gear 18 having the same diameter as the driven gear 7 is fixed to the rotating shaft 5 between the holder 13 and the driven gear 7. A first transmission gear 19, a second transmission gear 20, and both transmission gears 19, 20 are provided on the back side of the holder 13.
Is rotatably mounted on the intermediate transmission gear 21 that meshes with.

The first transmission gear 19 meshes with the driving gear 18, and the second transmission gear 20 meshes with the driven gear 7. Therefore, the rotational force of the rotating shaft 5 is
8 to the driven gear 7 via the first transmission gear 19, the intermediate transmission gear 21, and the second transmission gear 20 in that order.

Accordingly, the cylindrical body 1 fixed to the rotary shaft 5 and the surrounding member 6 fixed to the driven gear 7 via the holding member 8 are integrally formed with the rotation of the rotary shaft 5. Will rotate. That is, there is no relative speed between the cylindrical body 1 and the surrounding member 6, and the cylindrical body 1 and the surrounding member 6 rotate while always maintaining a constant positional relationship.

In FIG. 2 and FIG.
Is a micro switch for positioning the holder 13; 24 is a printing paper 34 (see FIG.
Is a press roller for press-contacting the printing area 4. Reference numeral 40 denotes a timing belt for taking timing from the cylindrical body 1, and reference numeral 41 denotes a timing pulley.

Next, the configuration of the main part of the printing apparatus will be outlined based mainly on FIG. The stencil sheet 9 has a width slightly shorter than the length of the cylindrical body 1 in the generatrix direction, and is wound in a roll shape. On the downstream side (right side) in the drawing direction of the stencil sheet 9, a thermal head 25 extending in the width direction of the stencil sheet 9 for perforating a stencil image on the stencil sheet 9.
And a platen roller 26, and a cutter 27 for cutting the stencil sheet 9 after stencil making into a predetermined length is provided downstream of the thermal head 25. 28,
Reference numerals 29 and 30 denote transport roller pairs for transporting the stencil sheet 9.

When the stencil sheet 9 is cut into the A3 size, the stencil sheet 9 is transported slightly longer than the longitudinal dimension of the A3 size, then cut by the cutter 27, and when cut into the A4 size, A4 stencil paper 9
The sheet may be cut by the cutter 27 after being conveyed slightly longer than the short dimension of the size.

When the stencil sheet 9 is cut to the B4 size, the stencil sheet 9 may be conveyed slightly longer than the longitudinal hole size of the B4 size, and then cut by the cutter 27. In the B4 size and the A3 size, the longer sides correspond to the circumferential direction of the cylinder 1 and the shorter sides correspond to the generatrix direction of the cylinder 1, respectively.
Since it is shorter than the short side of the three sizes, a dead space is generated near both side edges parallel to the conveying direction of the stencil sheet 9, but it is inevitable that the stencil sheet 9 of the same size is used.

A sensor 31 for checking whether or not the stencil sheet 9 has been gripped by the clamper 10 is provided at an upper portion on the downstream side of the transport roller pair 30 on the most downstream side.
The clamper opening / closing motor 32 for opening and closing the clamper 10 and the clamper opening / closing motor 32 are
A moving motor 33 is provided for moving the motor to a position approaching to and a position away from the cylindrical body 1.

At the lower right of the cylindrical body 1, a paper feed roller 35 for feeding the stacked printing papers 34 from the uppermost one is pressed from above and pressed against the printing papers 34. On the downstream side (left side) in the feeding direction, a paper feed roller 35 is provided.
After temporarily stopping the printing paper 34 fed in
A pair of secondary paper feed rollers 36 and 37 for re-feeding the paper at a proper timing are provided.

On the downstream side of the press roller 24, a paper discharge conveyor 38 for discharging the printing paper 34 after printing is provided. Above the paper discharge conveyor 38, the printing paper 34 attached to the cylindrical body 1 is placed. A peeling claw 39 for peeling is provided.

When the printing operation is performed using the stencil sheet 9 of A3 size, the relative position between the surrounding member 6 and the cylindrical body 1 is maintained in the relationship shown in FIG. The downstream end is gripped by the clamper 10 and wound around the cylindrical body 1. At this time, the upstream side edge of the stencil sheet 9 is wound so as to be located above the surrounding member 6. When the upstream side edge of the stencil sheet 9 is wound so as to be positioned above the surrounding member 6 as described above, when the used stencil sheet 9 is peeled off from the cylindrical body 1 and discharged, the upstream side is removed. It can be easily peeled off from the side edge.

When the printing operation is performed using the stencil sheet 9 of A4 size, first, the position changing motor 1 is used.
6, the sector gear 14 fixed to the holder 13 is driven to move and maintain the relative position between the surrounding member 6 and the cylindrical body 1 up to the relationship shown in FIG. At this time,
The printing area in the circumferential direction of the cylindrical body 1 corresponds to the short side of the A4 size.

Then, the downstream side of the printing area 4 of the cylindrical body 1 is partially surrounded by the surrounding member 6, and the downstream edge of the stencil sheet 9 is gripped by the clamper 10 on the upstream side of the surrounding portion. Then, it is wound around the cylindrical body 1. At this time, the upstream side edge of the stencil sheet 9 is wound so as to be located above the non-printing area 2. The contact position of the press roller 24 is different between the case where the stencil sheet 9 of A3 size is wound and the case where the stencil sheet 9 of A4 size is wound. As described above, the upstream edge of the stencil sheet 9 is positioned above the non-printing area 2 and the surrounding member 6.
When the stencil sheet is wound so as to be positioned above the stencil sheet 9, not only can the used stencil sheet 9 after use be easily separated from the cylindrical body 1, but also the press roller 24 is pressed against the stencil sheet 9. Ink leakage from the end of the stencil sheet 9 is eliminated.

In this embodiment, the position change motor 16
Is a mere DC motor, so that the surrounding member 6 alternatively moves between the non-enclosed position shown in FIG. 2 and the enclosed position shown in FIG. By using a motor, the surrounding member 6
Can be maintained in any position. With this configuration, the present invention can be applied to B4 size and the like other than A3 size and A4 size.

[0032]

According to the first main invention, the surrounding member for partially surrounding the cylindrical body over the entire area along the generatrix direction and along the circumferential direction of the peripheral side surface is the circular member of the cylindrical body. Since it is provided so as to be movable in the circumferential direction, when short printing base paper is used, if the non-winding area of the cylindrical body is surrounded by the surrounding member, paper dust or the like adheres to the area. I will not do it.

Therefore, when printing on a small printing paper, a printing base paper corresponding to the size may be used.
Printing base paper can be used efficiently and is economical.

In the second main invention, a clamper for holding the printing base paper supplied by the base paper supply means is openably and closably mounted near one side edge of the surrounding member parallel to the generatrix direction. When the operation of the paper means is controlled with reference to the position of the clamper, the downstream edge of the printing paper and the downstream edge of the printing base paper easily match regardless of the position of the surrounding member with respect to the plate cylinder, and printing is performed. Control of the entire apparatus can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a plate cylinder.

FIG. 2 is a front view of a plate cylinder.

FIG. 3 is a front view of the plate cylinder in a state different from FIG. 1;

FIG. 4 is a side view of a plate cylinder.

FIG. 5 is a schematic front view of a printing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical shape 2 Non-printing area 3 Ink inlet 4 Printing area 5 Rotating shaft 6 Surrounding member 7 Follower gear 8 Holding member 9 Stencil stencil (print stencil) 10 Clamper 11 Clamp mounting part (Grip of downstream edge of stencil stencil Part) 12 film 12 13 holder (position changing means) 14 sector gear 15 body frame 16 position changing motor 17 drive gear 18 driving gear 19 first transmission gear 20 second transmission gear 21 intermediate gear 22 micro switch 23 micro switch 24 press roller 25 Thermal head 26 Platen roller 27 Cutter 28 Transport roller pair 29 Transport roller pair 30 Transport roller pair 31 Sensor 32 Clamp opening / closing motor 33 Moving motor 34 Printing paper 35 Paper feed roller 36 Secondary paper feed roller 37 Secondary paper feed roller 38 Discharge conveyor 39 Peeling claw 4 Timing belt 41 timing pulley

Claims (13)

(57) [Claims] 1. A plate cylinder having a printing body paper wound around a peripheral side surface and a cylinder body containing printing ink therein, wherein said cylinder body is formed over the entire area along the generatrix direction and is formed in a circumferential direction. A plate cylinder, wherein a surrounding member partially surrounding the side surface along the circumferential direction is provided so as to be movable along the circumferential direction of the cylindrical body. 2. A printing area and a non-printing area are formed in the cylindrical body, and the surrounding member selectively switches between a non-printing position surrounding the non-printing area of the cylindrical body and a printing position surrounding the printing area. The plate cylinder according to claim 1, wherein the plate cylinder is configured to move. 3. The plate cylinder according to claim 1, wherein the surrounding member is configured to be fixed at an arbitrary position relative to the cylindrical body. 4. The plate cylinder according to claim 1, wherein a clamper for holding the printing base paper is openably and closably mounted near one side edge of the surrounding member parallel to the generatrix direction. 5. The plate cylinder according to claim 1, wherein the surrounding member is mounted on a holding member held on a rotating shaft of the cylindrical body. 6. The plate cylinder according to claim 1, wherein a portion of the surrounding member that grips the printing base paper is formed of a rigid body, and the other portion is formed of a film. . 7. The enclosing member and the holding member for holding the enclosing member on a rotating shaft of a cylindrical body are integrally formed of a plastic or a metal plate. Plate cylinder. 8. The plate cylinder according to claim 5, wherein the holding member of the surrounding member is fixedly mounted on a rotating shaft of the cylindrical body and is fixed to a driven gear that rotates synchronously with the cylindrical body. 9. A position changing means for changing a relative position of the surrounding member with respect to the cylindrical body is fixedly mounted on a rotating shaft of the cylindrical body, and a driven member fixed to the surrounding member is attached to the position changing means. 9. The plate cylinder according to claim 8, further comprising a transmission gear rotatably mounted to mesh with a gear and a driving gear fixed to the rotating shaft, respectively, for transmitting a rotational force from the driving gear to the driven gear. 10. A large-diameter gear for swinging the position changing means around a rotation axis is fixed to the position changing means, and a driving gear is meshed with the large-diameter gear. 9. The plate cylinder according to 9. 11. The printing base paper is wound so that one end edge thereof is gripped by a clamper and the other end edge is located in a non-printing area of a cylindrical body or an upper part of a surrounding member. A plate cylinder according to any one of the above. 12. A printing machine according to claim 1, wherein the printing base paper is wrapped around the peripheral surface, and a cylindrical body in which the printing ink is stored is provided. A surrounding member partially surrounding along the circumferential direction,
A plate cylinder movably mounted along the circumferential direction of the cylindrical body, stencil supply means for supplying a printing stencil after plate making to the plate cylinder, and paper supply means for supplying printing paper to the plate cylinder A printing device that is made. 13. A clamper for gripping the printing base paper supplied by the base paper supply means is openably and closably mounted near one side edge of the surrounding member parallel to the generatrix direction, and the operation of the paper supply means is controlled by the clamper. 13. The printing apparatus according to claim 12, wherein the printing apparatus is controlled based on the position.