JP4436746B2 - Offset printing machine - Google Patents

Description

  The present invention relates to, for example, an offset printing machine for multi-color printing, and more particularly to an offset printing machine provided with a height adjusting mechanism for a nail base of an intermediate cylinder that conveys a sheet between printing units corresponding to respective colors.

Conventionally, for example, a sheet-fed multicolor printing offset printing machine according to Patent Document 1 is configured as shown in FIG.
In FIG. 4, the offset printing machine 1 includes printing units 1a, 1b, 1c, and 1d for each color of yellow, magenta, cyan, and black, for example. In FIG. 4, in order to make the configuration easy to see, detailed configurations of the inking portion and the water immersion portion are omitted.
Each of the printing units 1a to 1d includes plate cylinders 2a to 2d, blanket cylinders 3a to 3d, and impression cylinders 4a to 4d, respectively, and intermediate cylinders 5a and 5b, between the impression cylinders 4a to 4d, respectively. 5c.

  Further, a paper feed unit 6 is provided at the front stage of the printing unit 1a, and a paper discharge unit 7 is provided at the rear stage of the printing unit 1d. As a result, the sheet A is fed from the paper feed section 6 between the blanket cylinder 3a and the plate cylinder 2a of the first printing unit 1a through the paper feed table 6a, the swing mechanism 6b and the transfer cylinder 6c. Then, the sheet A is discharged from the impression cylinder 4d of the last printing unit 1d onto the discharge table 7c of the discharge unit 7 through the delivery cylinder 7a and the chain gripper 7b.

  The printing units 1a to 1d have the same configuration, and printing ink is applied to a printing plate (not shown) mounted along the peripheral surfaces of the plate cylinders 2a to 2d. Printing is performed by transferring the printing ink applied on the plate onto the blanket cylinders 3a to 3d, and further onto the sheet paper that is pressed against the blanket cylinders 3a to 3d by the impression cylinders 4a to 4d. It is.

  Here, the intermediate cylinder 5 is selected so that the circumferential length of the cylindrical peripheral surface is a plurality of, for example, two sheets A, and the length is along the peripheral surface. They are arranged at equiangular intervals with respect to the rotation axis. Note that a plurality of claw portions are arranged in a distributed manner along the axial direction of the intermediate body 5.

Such a claw portion includes a claw base arranged so as to be adjustable in the radial direction with respect to the peripheral surface of the intermediate cylinder 5, a spring or the like so as to sandwich the sheet from the outside in the radial direction to the surface of the claw base. And a claw pressed by the pressing means.
Here, each nail base is appropriately adjusted in the radial direction of the intermediate cylinder by an adjusting device as shown in Patent Document 2, for example, corresponding to the thickness of the sheet to be printed at that time. The height is adjusted with respect to the circumferential surface of the intermediate cylinder.

According to the offset printing machine 1 having such a configuration, the sheet fed from the sheet feeding unit 6 with the printing plates attached to the respective plate cylinders 2a to 2d is transferred to the respective printing units 1a to 1c. Are sequentially printed with the corresponding printing ink, and then held on the peripheral surface by the claw portions of the intermediate cylinders 5a to 5c, respectively, delivered to the next printing unit, and finally printed by the printing unit 1d. Are discharged and stacked on the discharge table 7c by the discharge unit 7. Thereby, the printing process is sequentially performed on each sheet.
Japanese Patent Application No. 2003-276087 JP-A-11-099623

  However, the conventional offset printing machine 1 needs to adjust the height of the individual nail base of each nail portion every time the thickness of the sheet to be printed is changed in each of the intermediate cylinders 5a to 5c. There is a problem that adjustment work is complicated, printing interruption time becomes long, and printing efficiency is impaired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an offset printing machine in which the height of the nail bases of the respective nail portions can be adjusted simultaneously and uniformly.

In order to solve the above-mentioned problems, an invention according to claim 1 of the present invention is an offset printing machine comprising an intermediate cylinder having a plurality of sets of claw portions composed of claw bases and claws arranged at equal angular intervals in the circumferential direction. The plurality of sets of claw portions each have a claw base height adjustment mechanism that adjusts the height of the claw base, and the intermediate body has a height of the claw base by the claw base height adjustment mechanism on one side surface thereof. is adjusted based on the height adjustment of the gripper pads by any gripper pad height adjustment mechanism has a simultaneous and uniform makes it adjustable feature height adjustment of the other claw block, said gripper pad A rotating gear attached to a camshaft having a cam surface for moving in the radial direction of the intermediate cylinder, a gear portion meshing with the rotating gear, a concentric arrangement with the intermediate cylinder, and the intermediate cylinder A region that is rotatably supported around a central axis and meshes with the rotating gear Wherein characterized in that it comprises an interlocking means and an annular drive member which has a gear portion.

According to a second aspect of the present invention, in the first aspect of the invention, the claw portion includes a worm that is rotationally driven from outside to adjust the height of the claw base, and the worm meshes with the rotating gear. It is characterized by that.

  According to the present invention, the claw bases of the claw portions arranged at equiangular intervals in the circumferential direction of each intermediate cylinder are connected to each other via the interlocking means, so that any one claw portion can be When adjusted in the radial direction with respect to the trunk, the heights of the claw bases of the claw portions at other angular positions are similarly adjusted via the interlocking means.

  Therefore, by adjusting the height of the claw base of one claw part with respect to the circumferential surface of the intermediate cylinder corresponding to the paper thickness of the sheet, the claw base of the claw part at other angular positions is also the same By adjusting the height, it is possible to appropriately adjust the height of the claw bases of all the claw portions provided in the intermediate body. As a result, the height adjustment of the nail base corresponding to the sheet thickness of the sheet can be easily and quickly performed, the adjustment work is simplified, and the printing interruption time when the sheet is replaced is reduced. It is shortened and work efficiency can be improved.

  Further, the interlocking means comprises a rotating gear attached to an axially extending cam shaft having a cam surface for moving each claw base in the radial direction of the intermediate drum, and a gear portion meshing with the rotating gear, A cam for moving one of the claw bases, when it is composed of an annular drive member arranged concentrically with the intermediate cylinder and rotatably supported around the central axis of the intermediate cylinder By rotating the shaft and adjusting the height of the claw base with respect to the circumferential surface of the intermediate cylinder according to the sheet thickness of the sheet, the rotation of the cam shaft is changed from the rotating gear to the drive member. The drive member is transmitted to the gear portion, and the drive member rotates around the central axis of the intermediate cylinder according to the rotation amount of the rotary gear.

  Therefore, the rotation of the drive member is transmitted again to the rotating gear attached to the cam shaft for moving the claw base at another angular position via the gear portion, and the other claw base is moved. The cam shaft is rotationally driven in the same direction by the same rotational amount as the rotational amount of the rotationally driven cam shaft. As a result, the claw bases at other angular positions are also moved in the same direction by the same distance as the claw bases with respect to the radial direction of the intermediate cylinder, and the height is adjusted simultaneously and uniformly with respect to the circumferential surface of the intermediate cylinder. be able to.

  Further, in the case where the driving member includes a gear portion only in a region that meshes with the rotating gear in response to the radial movement of the intermediate drum of each claw base, the driving member has a gear over its entire circumference. Since there is no need to provide a portion, the manufacturing cost is reduced, the mass of the rotating portion is reduced, and the rotational moment is reduced.

  Furthermore, for each of the claw parts, only one claw part is provided with a worm that is rotationally driven from outside to adjust the height of the claw base, and when this worm meshes with the rotating gear, Since all the claw portions provided on the intermediate cylinder are connected via the interlocking means, a worm for adjusting the height of the claw base from the outside may be provided on only one claw portion. Therefore, it is not necessary to provide a worm for the claw portions at other angular positions, and the manufacturing cost can be reduced.

  Thus, according to the present invention, when changing the paper thickness of the sheet to be printed, one nail portion distributed and arranged at equal angular intervals in the circumferential surface direction in each intermediate cylinder. As a result, the height of the claw bases of the claw portions at other angular positions can be adjusted simultaneously and uniformly with a simple operation of just adjusting the height of the claw base. Therefore, the work of adjusting the height of the claw base is simplified, and the adjustment work is easily and quickly performed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an offset printing machine according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view showing a configuration of an intermediate cylinder which is a main part of an embodiment of an offset printing machine according to the present invention.
In FIG. 1, the intermediate body 10 includes a plurality of claw portions 11 for gripping a sheet, and an interlocking mechanism 20 that interlocks the height adjustment of each claw portion 11. The intermediate cylinder 10 shown in FIG. 1 is a triple cylinder in which the circumferential length of the cylindrical peripheral surface is selected corresponding to the length of three sheets of paper. It is not limited.

The claw portions 11 are arranged at three locations along the circumferential surface of the intermediate body 10 so as to be equiangular with respect to the rotation shaft 12.
The height of the claw base is adjusted by a common cam shaft 13 (see FIG. 3) with respect to the plurality of claw portions 11 aligned in the axial direction at the same angular position of the intermediate body 10. Yes.

  As shown in FIGS. 2 and 3, the claw portion 11 includes a claw base 14 arranged so that the height thereof can be adjusted in the radial direction with respect to the circumferential surface of the intermediate body 10, and a sheet with respect to the surface of the claw base 14. And a claw 15 that is pressed so as to sandwich the leaf paper.

As shown in FIG. 3, the claw base 14 is fixed by screws 14b to a claw base mounting plate 14a supported so as to be movable perpendicularly to the peripheral surface of the intermediate body 10, that is, in the radial direction.
As shown by an arrow B in FIG. 3, the claw base mounting plate 14a has its inner end selectively brought into contact with the circumferential surface or the cam surface of the cam shaft 13 as described above by the tension spring 14c. It is urged toward the inside in the radial direction.

Here, the cam shaft 13 extends in an axial direction parallel to the central axis of the intermediate cylinder 10, and penetrates the plurality of claw portions 11 arranged in the axial direction at the same angular position with respect to the central axis. ing.
Accordingly, the inner ends of the claw base mounting plates 14a of the claw portions 11 arranged at the same angular position are in contact with the circumferential surface or cam surface of the common cam shaft 13, respectively.

Further, as shown in FIG. 3, the cam shaft 13 has a plurality of cam surfaces formed at different distances from the central axis, and in the illustrated case, three cam surfaces 13a and 13b. , 13c.
As a result, the camshaft 13 rotates and the center or peripheral surface of each cam surface 13a, 13b, 13c moves to a position facing the inner end of the claw base mounting plate 14a, whereby the claw base mounting plate 14a. Are in contact with the cam surfaces 13a, 13b, 13c or the circumferential surface of the camshaft 13, and have four positions in the radial direction of the intermediate cylinder 10, that is, four height positions with respect to the peripheral surface of the intermediate cylinder 10. To be adjusted.
Here, the distance in the radial direction from the peripheral surface of the cam shaft 13 and the central axis of each of the cam surfaces 13a, 13b, 13c is appropriately selected according to the sheet thickness of the sheet used in the offset printing machine. ing.

The claw 15 is supported by the claw holder 15a so as to be swingable around the support shaft 15b, and the tip 15c of the claw 15 abuts against the outer surface of the claw base 14 from the outside in the radial direction of the intermediate body 10 and closes. The spring 15d is biased.
Here, for example, a cam follower (not shown) attached to one end of the intermediate body 10 in the axial direction is in contact with a cam surface formed around a claw opening / closing cam that is rotationally driven. .
As a result, the claw 15 is released in synchronism with the conveyance timing of the sheet by the cam follower following the cam surface of the claw opening / closing cam. The sheet is closed after being inserted between the sheet 15 and the leading edge of the sheet, and is opened in synchronization with the timing of delivery to the next printing unit.

The above-described configuration is substantially the same as the conventional intermediate cylinder, but the intermediate cylinder 10 according to the embodiment of the present invention is different in the following points.
In other words, the intermediate body 10 is further linked to a mechanism for interlocking movements for adjusting the height of the claw base 14 in the respective claw portions 11 arranged at equal angular intervals with respect to the central axis 12 of the intermediate cylinder. 20 is provided.

  As shown in FIG. 1, the interlocking mechanism 20 includes an annular drive member 21 that is rotatably supported around the central axis of the intermediate body 10, and a rotating gear attached to the cam shaft 13 of each of the claw portions 11. 22 (see FIG. 2).

The drive member 21 is formed concentrically with respect to the central axis of the intermediate cylinder 10, and as shown in FIG. 1, a gear portion 23 that meshes with a rotary gear 22 attached to the cam shaft 13 of each claw portion 11. It has.
The gear portion 23 is formed in an arc shape so as to be concentric with the intermediate body 10. When the driving member 21 rotates, each gear portion 23 rotates the rotating gear 22 in the same direction by the same amount of rotation. Are arranged as follows.
In the illustrated case, the gear portion 23 is provided only in a region corresponding to the rotation of the rotating gear 22 that rotates as the cam shafts rotate. Thereby, the inertial mass at the time of rotation of the drive member 21 is reduced and the rotation moment is reduced. However, the present invention is not limited to this, and the gear portion 23 is provided over the entire circumference of the drive member 21. It may be configured.

  The rotating gear 22 is attached to one end of the cam shaft 13 of each claw portion 11, is configured to rotate integrally with the cam shaft 13, and meshes with the corresponding gear portion 23 of the driving member 21. Yes.

Here, of the claw portions 11, any claw portion (for example, the claw portion on the left side in FIG. 1) 11 is a worm that meshes with a rotating gear 22 attached to the camshaft 13, as shown in FIG. 24.
The worm 24 has an outer end 24 a having a hexagonal hole exposed toward the peripheral surface of the intermediate cylinder 10. Thereby, by rotating the worm 24 using a tool such as a hexagon wrench from the outside, the rotary gear 22 and the cam shaft 13 are rotated to adjust the height of the claw base 14 of the claw portion 11. It is like that.
Of course, other claws can be provided with the same configuration as described above.

The offset printing machine according to the embodiment of the present invention is configured as described above, and the height of the nail base 14 of the intermediate cylinder 10 is adjusted according to the thickness of the sheet to be printed by the offset printing machine. The adjustment work is performed as follows.
First, a tool such as a hexagon wrench is inserted into the hexagon hole of the outer end 24a of the worm 24 of the left claw portion 11 in FIG. Thereby, rotational motion is transmitted from the worm 24 to the rotary gear 22 and the cam shaft 13, and the cam shaft 13 of the claw portion 11 is rotated, and the peripheral surface of the cam shaft 13 or the cam surfaces 13 a, 13 b, 13 c (see FIG. In the case of 3, the peripheral surface) selectively opposes the inner end of the claw base mounting plate 14a.

Accordingly, the claw base mounting plate 14a is urged toward the cam shaft 13 by the spring 14c, so that the inner end thereof is on the circumferential surface of the cam shaft 13 or the cam surfaces 13a, 13b, 13c. Abut.
As a result, the claw base mounting plate 14a is positioned in the radial direction of the intermediate body 10 according to the distance from the peripheral surface of the cam shaft 13 or the center of each cam surface 13a, 13b, 13c, and the claw base 14 is positioned in the middle. The height is adjusted with respect to the circumferential surface of the trunk 10.

Further, as described above, when the rotating gear 22 is rotated by the rotation of the worm 24, this rotation is transmitted from the corresponding gear portion 23 of the driving member 21 to the driving member 21, and the driving member 21 is rotated by the rotating gear 22. Rotate with.
Thereby, the rotation is transmitted from the other gear portion 23 provided in the drive member 21 to the rotating gear 22 attached to the cam shaft 13 of the other two claw portions 11, and the rotating gears of the other two claw portions 11 are transmitted. 22 rotates in the same direction by the same amount of rotation in synchronization with the rotation of the rotating gear 22 of the claw portion 11.

  Accordingly, in the other two claw portions 11, the cam shafts 13 are similarly rotated, and the peripheral surfaces of the cam shafts 13 or the cam surfaces 13 a, 13 b, 13 c (peripheral surfaces in the case of FIG. 3). Since it selectively opposes the inner end of the claw base mounting plate 14a, the inner end of the claw base mounting plate 14a contacts the peripheral surface of the cam shaft 13 or the cam surfaces 13a, 13b, 13c. Thereby, also in the other two claw portions 11, the claw base mounting plate 14a is positioned with respect to the radial direction of the intermediate body 10, and the height of the claw base 14 is adjusted with respect to the circumferential surface of the intermediate body 10. become.

In this way, by rotating the cam shaft 13 of one claw portion 11 from the outside via the worm 24, the claw base 14 of this claw portion 11 is intermediate according to the paper thickness of the sheet to be printed. When the height is adjusted with respect to the peripheral surface of the body 10, the height of the claw bases 14 in the other two claw portions 11 is also adjusted simultaneously and uniformly through the interlocking mechanism 20 in conjunction with the height adjustment. be able to.
Therefore, among the plurality of claw portions 11 that are dispersedly arranged at equiangular intervals with respect to the central axis of the intermediate cylinder 10, the height of the claw base 14 with respect to the peripheral surface of the intermediate cylinder 10 is high. By performing the height adjustment operation, the same height adjustment operation can be performed in the other two claw portions 11 in conjunction with the height adjustment. As a result, when the thickness of the sheet to be printed is changed, the height adjustment operation of the nail base 14 in each nail portion 11 is simplified, and the print interruption time can be shortened.

In the above-described embodiment, the intermediate cylinder 10 is configured to hold the three sheets of paper along the peripheral surface by the claw portion 11, but is not limited to this, and two or four or more sheets are used. In order to grip a sheet of paper, in the configuration of an intermediate cylinder such as a so-called double cylinder or quadruple cylinder having two or four claws arranged at equal angular intervals with respect to the circumferential direction of the peripheral surface However, it goes without saying that the present invention can be applied.
In the above-described embodiment, each offset printing machine performs four-color printing on one side of the sheet. However, the present invention is not limited to this, and two-color printing is possible if an intermediate cylinder is provided. It is apparent that the present invention can be applied to an offset printing machine that performs three-color printing or multi-color printing of five or more colors or double-sided printing.
Thus, according to the present invention, it is possible to provide an offset printing machine that can adjust the height of nail bases of the nail portions simultaneously and uniformly with a simple configuration.

It is a schematic sectional drawing which shows the structure of the intermediate | middle cylinder which is the principal part of one Embodiment of the offset printing machine by this invention. It is the (A) partial expanded sectional view and (B) partial expanded side view which expand and show the nail | claw part in an intermediate body. It is the elements on larger scale which looked at the nail | claw part from the back side. It is a schematic sectional drawing which shows the whole structure of the conventional offset printing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Intermediate body 11 Claw part 12 Rotating shaft 13 Cam shaft 13a, 13b, 13c Cam surface 14 Claw base 14a Claw base mounting plate 14b Screw 14c Spring 15 Claw 15a Claw holder 15b Support shaft 15c Tip 15d Spring 20 Interlock mechanism 21 Drive member 22 Rotating gear 23 Gear part 24 Warm

Claims (2)

In an offset printing machine comprising an intermediate cylinder having a plurality of nail portions composed of nail bases and nails arranged at equiangular intervals in the circumferential direction,
The plurality of sets of claw portions each have a claw base height adjustment mechanism that adjusts the height of the claw base,
The intermediate body is configured such that, on one side thereof, the height of the claw base is adjusted by the claw base height adjustment mechanism, and the height of the claw base is adjusted by an arbitrary claw base height adjustment mechanism. Has the ability to adjust height adjustment simultaneously and uniformly ,
A rotating gear attached to a camshaft having a cam surface for moving the claw base in the radial direction of the intermediate body;
A gear portion meshing with the rotating gear;
It is comprised of an annular drive member that is concentrically arranged with the intermediate cylinder and is rotatably supported around the central axis of the intermediate cylinder and is provided with the gear portion only in a region that meshes with the rotary gear. An offset printing machine comprising interlocking means . The claw portion includes a worm that is rotationally driven to adjust the height of the claw base from the outside,
The offset printing press according to claim 1 , wherein the worm meshes with the rotating gear .

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