JP2003011329A - Blade regulating unit of ink fountain for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade regulating unit of an ink fountain for a printer capable of suitably regulating a gap between a fountain roller and a blade and easily executing inspection and maintenance works. SOLUTION: The blade regulating unit of the ink fountain for the printer comprises the blade 17 having a base end mounting part 17a, a leaf spring 17b and a blade 17c and mounted at a fountain base 15 so as to block an ink feeding port 14 formed of a bottom plate 11a of the fountain and the fountain roller 12. A front edge of the plate 11a has a sealing surface S1 of the ink in a direction crossing with the plate 11a. The blade 17c has a sealing surface S2 opposed to the surface S1 via an infinitesimal gap on a back surface thereof. Thus, a lower surface of the part 17c is pressed by a cam member 20 to retractably move the part 17c to regulate the gap G.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink fountain blade adjusting device for a printing press.

[0002]

2. Description of the Related Art Generally, in an offset printing machine,
As shown in FIG. 6, an ink fountain 51 and a fountain roller 52 are arranged above and below the printing paper P, respectively. A plate cylinder 54 is connected to each of the pot rollers 52 via a plurality of kneading rollers 53, and a printing paper P is supplied between a pair of rubber cylinders 55 provided for both plate cylinders 54. It is like this. That is, as the roller 52 rotates, the ink in the ink fountain 51 is supplied to the plate cylinder 54 via the outer peripheral surfaces of the rollers 52 and 53, and is transferred from the plate cylinder 54 to the paper P via the rubber cylinder 55. It is like this.

By the way, in such a printing form,
The printing on the paper P is performed with a predetermined set width in the axial direction of the roller 52, but in the normal case, the ink transfer area at each position within the set width differs depending on the printing pattern. Therefore, if the ink supply amount at each position in the axial direction of the fountain roller is the same, printing unevenness will occur on the printed paper P. Therefore, conventionally, the ink fountain of a printing machine as shown in FIG. A blade adjustment device 61 has been proposed.

In this conventional blade adjusting device 61, a bottom plate 64a of an ink fountain 64 is attracted and held by a magnet on the upper surface of a fountain base 63 provided adjacent to the fountain roller 62. The ink fountain 64 and the fountain roller 62 form an ink reservoir 65. In addition, at the front edge of the bottom plate 64a of the ink fountain 64, a delivery port 6 for delivering ink is provided.
6, a plurality of blades 68 are arranged on the upper surface of the front part of the crucible base 63 so as to close the delivery port 66 from below in the axial direction of the crucible roller 62 without a gap. A gap G for sending out ink is formed between the tip of each blade 68 and the outer peripheral surface of the fountain roller 62.

The blade 68 is constantly urged by a leaf spring 69 provided on the crucible base 63 in a direction away from the crucible roller 62. A push rod 70 is housed in the crucible base 63 so as to be movable back and forth in correspondence with each of the blades 68. A manually operated cam mechanism 71 is provided corresponding to each push rod 70. Then, when the operation knob 72 of the cam mechanism 71 is rotated, the cam plate 73 is rotated and the push rod 70 is rotated.
Is moved back and forth, the position of the blade 68 is adjusted, and the gap G is adjusted.

[0006]

In the above conventional blade adjusting device 61, the upper surface of the blade 68 is brought into contact with the lower surface of the tip of the bottom plate 64a to seal both members, and the lower surface of the blade 68 is attached to the pot base 63. It was supposed to be in sliding contact with the upper surface. Therefore, it is necessary to press the tip portion of the bottom plate 64a against the upper surface of the blade 68 with a predetermined elastic force, which causes a problem that the adjustment work of the blade 68 cannot be performed smoothly. Also, the blade 68
Since the groove-shaped step portion M is formed between the bottom plate 64a and the bottom plate 64a, it is difficult to clean the step portion M during maintenance and inspection, and there is a problem that ink residue occurs.

In addition, the blade 68 is made of a plate material so that the width L
There is also proposed a blade adjusting device which is formed in a letter shape and elastically presses the back surface of the tip blade portion against the front end surface of the pot base. In this conventional example, since there is no step portion, the problem at the time of maintenance and inspection can be solved, but since the blade portion is elastically contacted with the pot base, it is not possible to stably perform the raising and lowering operation of the blade portion, There has been a problem that the work of adjusting the gap G becomes inappropriate.

The present invention solves the problems existing in the above-mentioned prior art, allows the gap between the blade and the fountain roller to be properly adjusted, and allows the maintenance and inspection work to be easily performed. To provide a blade adjusting device of the above.

[0009]

In order to solve the above problems, the invention according to claim 1 has an ink fountain in which an ink feed opening is formed at a front edge of a bottom plate and a position immediately before the ink fountain. A fountain roller rotatably provided about an axis parallel to the width direction of the ink fountain, for feeding the ink in the ink fountain in a film form, and the ink fountain adjacent to each other in the axial direction of the fountain roller. A plurality of blades that are arranged so as to block the ink delivery port from below, form a gap for sending out ink between the outer peripheral surface of the fountain roller, and are individually movable with respect to the fountain roller. In a printing machine provided with an operating mechanism for moving the blades back and forth, a front end edge of the bottom plate is provided with an ink sealing surface in a direction intersecting with the bottom plate,
The gist of the present invention is to provide a sealing surface that faces the sealing surface with an inelastic contact or a minute clearance with respect to the rear surface of the blade opposite to the front edge forming the clearance.

According to a second aspect of the present invention, in the first aspect, the blade includes a base end mounting portion, a leaf spring portion and a blade portion, and the base end mounting portion is fixed to the pot base. The gist is that the sealing surface is formed on the back surface of the blade portion, and the lower surface of the blade portion is pressed upward by the operating mechanism against the elastic force of the leaf spring portion.

According to a third aspect of the present invention, in the second aspect, both of the sealing surfaces are formed in parallel with a rotation locus of the blade portion generated by elastic deformation of the leaf spring portion. Use as a summary.

The invention according to claim 4 is the invention according to claim 2 or 3.
In the operating mechanism, the rotary support shaft is rotatably supported on the fountain base forming the ink fountain, the operation knob or the motor for rotating operation is connected to one end of the rotary support shaft, and the blade portion is connected to the other end. The gist of the present invention is that it is configured by connecting a cam member that presses the lower surface of the and moves forward and backward.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the rotary support shaft is supported so that its position in the axial direction can be adjusted, and the cam member is moved in the central axial direction. The gist of the present invention is that the inclined cam surface formed on the lower surface of the blade portion is pushed to move back and forth.

According to a sixth aspect of the present invention, in any one of the second to fifth aspects, the cam member is formed on a first arcuate cam surface having a gentle slope in a range of 180 °,
The gist is that it is formed on the second arcuate cam surface having a large gradient in the remaining 180 ° range.

According to a seventh aspect of the present invention, in any one of the second to sixth aspects, a locking groove is formed on an outer peripheral surface of the rotary support shaft, and the engaging groove is formed on a part of the crucible base. An urging member that is locked in the stop groove is attached, and the urging member presses and urges the rotation support shaft in the thrust direction to hold the cam member at the rotationally adjusted predetermined position. Use as a summary.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a manual blade adjusting device in a printing machine will be described below with reference to FIGS.
It will be described with reference to FIG.

As shown in FIG. 1, the ink fountain 11 in this apparatus is composed of a bottom plate 11a arranged obliquely and side plates 11b arranged on both sides in the width direction thereof, and a fountain roller near the front edge of the bottom plate 11a. 12 is rotatably supported around an axis along the width direction of the ink fountain 11. And
An ink reservoir 13 is formed by the inner surface of the ink fountain 11 and the outer peripheral surface of the fountain roller 12, and an ink delivery port 14 is formed between the front edge of the bottom plate 11a of the ink fountain 11 and the outer peripheral surface of the fountain roller 12. ing. An integrally formed fountain base 15 is arranged below the bottom plate 11a of the ink fountain 11, and the ink fountain 1 is provided on the fountain base 15.
The bottom plate 11a of No. 1 is clamped and held by the screw 16. Although not shown, the lower edge of the side plate 11b has a pot stand 1
It is fastened and fixed to the side surface of No. 5 with bolts.

A plurality of blades 17 are fastened and fixed by screws 18 on the upper surface of the fountain base 15 near the ink delivery port 14. These blades 17 are attached to the crucible base 15 with screws 18 at the base end mounting portion 17a.
A leaf spring portion 17b integrally formed with the base end mounting portion 17a, and a blade portion 17c integrally formed at the tip edge of the leaf spring portion 17b. Then, each blade portion 17c is arranged at a position that closes the ink delivery port 14 formed by the bottom plate 11a and the fountain roller 12, and the blade portion 17c and the fountain roller 12 are caused by the forward and backward movement of each blade portion 17c in the obliquely vertical direction. The gap G formed between the two is adjusted. In the present embodiment, the base end mounting portion 17a of the blade 17 is integrally formed, and a fine slit is formed between the adjacent leaf spring portions 17b. The base end mounting portions 17a of the blades 17 may be individually formed.

As shown in FIG. 1, the bottom plate 11a of the bottom plate 11a of the fountain table constituting the ink fountain is attached to the front edge of the bottom plate 11a.
An ink seal surface S1 is formed in a direction intersecting with. A sealing surface S facing the rear surface of the blade 17 with a minute gap (0.01 mm) to the sealing surface S1.
2 is formed. The formation direction of the both seal surfaces S1 and S2 is set to the forward / backward movement direction of the blade (17). In this embodiment, the leaf spring portion 1 in FIG.
7b is elastically deformed in the counterclockwise direction about the base end root 17e. For this reason, the blade portion 17c moves back and forth, so that the seal surfaces S1 and S2 are formed so as to be parallel to the movement trajectory at that time.

The inclination angle α of the seal surfaces S1 and S2 with respect to the vertical line orthogonal to the upper surface of the bottom plate 11a is, for example, 24 degrees. This inclination angle α changes depending on the shape of the blade 17, and for example, when the leaf spring portion 17b becomes shorter, the inclination angle α becomes larger.

Next, an operation mechanism for moving the blade portion 17c forward and backward will be described. A rotary support shaft 19 is rotatably supported at a predetermined position of the crucible base 15. A cam member 20 is connected to the tip of the rotary support shaft 19 at a position corresponding to the blade portion 17c of the blade 17. The cam member 20 is provided with a cam surface 20a on the outer peripheral surface and pushes the lower surface of the blade portion 17c. As shown in FIG. 2, the outer peripheral surface of the cam surface 20a is formed on a first arcuate cam surface K1 having a gradual slope in a 180 ° semicircle and a second arcuate cam surface K2 having a large slope at the remaining 180 °. ing. The gradient is, for example, 0.0 mm to 0.2 mm for the first arcuate cam surface K1.
The second arc cam surface K2 is set to 0.2 mm to 0.5 mm. A cam side origin position setting pin 21a is implanted in the cam member 20, and when the operation knob 22 is turned to the right, the cam side origin position setting pin 21 is inserted and fixed at a predetermined position of the pot base 15. 21a hits,
The origin position of the cam member 20 is set.

A small-diameter mounting shaft 19a is integrally formed at the other end of the rotary support shaft 19, and an operating knob 22 is fixed to the outer end of the rotary support shaft 19 by a set bolt 23. The crucible base 15 is provided with a screw hole 15a corresponding to the mounting shaft 19a, and an adjusting member 24 is screwed to the mounting shaft 19a. Further, a thrust bearing 25 is interposed between the adjusting member 24 and the rotary support shaft 19. Further, the crucible base 15 is provided with a bolt 26 and a pressing member 27 so that the turning position of the adjusting member 24 is set to a predetermined position. A mounting block 31 is fixed to the crucible base 15, and a leaf spring 32 as a biasing member is fixed to the mounting block 31 by a bolt 33. The tip end edge of the leaf spring 32 is engaged with a locking groove 19b formed in the intermediate portion of the rotary support shaft 19. As a result, the rotation support shaft 19 is pressed and biased diagonally upward to the left in FIG. After adjustment, it is held in place.

As shown in FIG. 3, an inclined cam surface 17d is formed on the lower surface of the blade portion 17c so as to be lower toward the center axis O of the rotary support shaft 19 by the tip thereof. And
By moving the cam member 20 in the direction of the central axis O of the rotary support shaft 19, the inclined cam surface 17d is pushed to move back and forth, the gap G is adjusted, and the tip position of each blade portion 17c in the original position is adjusted. Are arranged.

In this embodiment, the rotary support shaft 19,
The blade portion 17 is formed by the cam member 20 and the operation knob 22.
An operation mechanism for moving the c back and forth is configured. next,
The operation of the ink fountain blade adjusting device in the printing press configured as described above will be described.

In FIG. 2, when the operation knob 22 is rotated, the rotation support shaft 19 and the cam member 20 are integrally rotated, and the lower surface of the blade portion 17c is slightly pushed upward by the cam surface 20a. Therefore, the leaf spring portion 17b is elastically deformed in the counterclockwise direction in FIG. 1 around the base end root portion 17e, and the ink feeding gap G is finely adjusted.

At the time of printing, when the fountain roller 12 is rotated counterclockwise in the state of FIG. 2, the ink in the ink reservoir 13 is transferred to the outer peripheral surface of the fountain roller 12 through the ink sending gap G. It adheres in a film form and is supplied to the plate cylinder through a kneading roller (not shown). At this time, in order to adjust the ink supply amount at each position in the axial direction of the fountain roller 12, each operation knob 22 provided on the fountain base 15 may be rotated.

That is, when it is desired to reduce the ink supply amount, the operation knob 22 is rotated in the direction in which the cam member 20 rotates normally (counterclockwise in FIG. 3). Then, since the cam surface 20a of the cam member 20 pushes the lower surface of the blade portion 17c of the blade 17 obliquely upward, the gap G between the front end portion of the blade portion 17c and the outer peripheral surface of the pot roller 12 is narrowed. The ink supply amount at the position corresponding to the blade portion 17c can be reduced.

On the other hand, when it is desired to increase the ink supply amount, the operation knob 22 is rotated in the opposite direction. Then, the pressing movement of the blade portion 17c is changed to the backward movement by the elastic support force of the plate spring portion 17b by the rotation support shaft 19 and the cam member 20, so that the gap G is widened and the ink supply amount increases.

Next, the effects of the blade adjusting device configured as described above will be described together with the configuration. (1) In the above embodiment, the sealing surface S1 is formed on the tip surface of the bottom plate 11a, and the sealing surface S is formed on the back surface of the blade portion 17c.
2 was formed, and both sealing surfaces S1 and S2 were opposed to each other with a minute gap. Further, the blade portion 17c is formed integrally with the leaf spring portion 17b and the base end mounting portion 17a, and the base end mounting portion 17a is fixed to the crucible base 15. Therefore, both sealing surfaces S
It is possible to maintain the sealing property between S1 and S2, and to smoothly move the blade portion 17c back and forth to create the gap G.
Can be properly adjusted.

Further, the upper surface of the bottom plate 11a and the blade portion 17c
It is possible to eliminate the formation of a stepped portion at the boundary with the upper surface of the ink, and it is also possible to prevent ink from remaining during cleaning and facilitate maintenance and inspection work.

(2) In the above embodiment, the cam surface 20a of the cam member 20 connected to one end of the rotary support shaft 19 is brought into contact with the lower surface of the blade portion 17c attached to the upper surface of the crucible base 15. did. Therefore, the blade portion 1
It is possible to simplify the operation mechanism for moving the 7c forward and backward, reduce the number of parts, and easily perform the manufacturing and assembling work. Further, since the blade portion 17c is pushed only by the rotary support shaft 19 and the cam member 20, the fine adjustment amount of the blade portion 17c is properly adjusted as compared with the method of interposing the push rod shown in the conventional example. Can be adjusted.

(3) In the above embodiment, the cam surface 20a of the cam member 20 is the first arcuate cam surface K1 that is gentle in the range of 180 °, and the second arcuate cam surface K2 that has a large gradient in the remaining 180 °. Therefore, the work of adjusting the gap G can be divided into fine adjustment and rough adjustment.

(4) In the above embodiment, the adjusting member 24 is provided to adjust the position of the rotary support shaft 19 and the cam member 20 in the axial direction thereof. Further, the lower surface of the blade portion 17c is an inclined cam surface 17d so that the tip thereof is lower than the center axis O of the rotary support shaft 19 toward the tip. For this reason,
When the rotation support shaft 19 and the cam member 20 are assembled, the adjustment member 24 is rotated to move the rotation support shaft 19 and the cam member 20 forward in the central axis O direction while the cam member 20 is at the origin position. By moving backward, the blade portion 17c can be moved forward and backward to adjust the gaps G to be constant.

The above embodiment may be modified and embodied as follows. As shown in FIG. 4, the leaf spring portion 1 of the blade 17
7b may be formed in an inverted L shape, the blade portion 17c may be locked to the front end surface of the pot base 15, and the lower surface of the blade portion 17c may be pressed obliquely upward by the cam surface 20a of the cam member 20. In this case, the blade portion 17c
In FIG. 4, since the leaf spring portion 17b is elastically deformed, the leaf spring portion 17b is moved forward and backward in the clockwise direction.

As shown in FIG. 5, the blade portion 17c
May be integrally formed with the upper end portion of the leaf spring portion 17b. Although not shown, the operation knob 22 may be omitted, and the gap G may be adjusted by rotating the rotation support shaft 19 by a stepping motor or a servomotor that rotates in the forward and reverse directions.

Although not shown, the leaf spring portion 17b and the blade portion 17c may be formed by separate members, and both members may be connected in a later step. The gap between the seal surfaces S1 and S2 may be set to a value other than 0.01 mm, for example, 1 to 50 μm. Alternatively, the gap may be eliminated so that the blade portion 17c moves back and forth in an inelastic contact state. (Definition) In this specification, the inelastic contact state between the seal surfaces S1 and S2 also refers to a state in which the blade 17 is pressed to such an extent that the movement of the blade 17 is not hindered in the adjustment work of the gap G of the blade 17. Shall be included.

[0037]

As described above in detail, according to the present invention, the clearance between the pot roller and the blade can be properly adjusted, and the maintenance and inspection work can be easily performed.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an ink fountain in a printing machine embodying the present invention.

FIG. 2 is a side sectional view of an ink fountain.

FIG. 3 is a front view of a cam member.

FIG. 4 is a partial cross-sectional view showing another example of the present invention.

FIG. 5 is a partial cross-sectional view showing another example of the present invention.

FIG. 6 is a schematic diagram of a printing machine.

FIG. 7 is a side sectional view showing a conventional ink fountain blade adjusting device.

[Explanation of Codes] 11 ... Ink fountain, 11a ... Bottom plate, 12 ... Roller, 14
... Ink delivery port, 17 ... Blade, 17a ... Base end mounting part, 17b ... Leaf spring part, 17c ... Blade part, 19 ...
A rotary support shaft that constitutes the operation mechanism, 20 ... a cam member that constitutes the operation mechanism, 20a ... a cam surface, 22 ... an operation knob that constitutes the operation mechanism, S1, S2 ... a sealing surface.

Claims (7)

[Claims] 1. An ink delivery port (14) at the front edge of the bottom plate.
An ink fountain (11) formed with the ink fountain (11) is provided rotatably in front of the ink fountain (11) around an axis parallel to the width direction of the ink fountain (11), and the ink in the ink fountain is sent out as a film. Vase roller (1
2) and adjacent to each other in the axial direction of the fountain roller so as to close the ink outlet of the ink fountain from below,
A plurality of blades (17) provided to form an ink feed gap with the outer peripheral surface of the fountain roller and capable of advancing and retreating separately with respect to the fountain roller, and advancing and retracting the blades (17). A printing machine provided with an operating mechanism (19, 20, 22) for operating the bottom plate (11a) with respect to the front edge of the bottom plate (11a).
An ink sealing surface (S1) is provided in a direction intersecting with, and the blade (17) faces the back surface of the blade (17) opposite to the front end edge of the blade (17) with non-elastic contact or a minute gap to the sealing surface (S1). An ink fountain blade adjusting device for a printing press, comprising a sealing surface (S2) for 2. The blade according to claim 1, wherein the blade comprises a base end mounting portion (17a), a leaf spring portion (17b) and a blade portion (17c).
a) is fixed to the pot base, and the blade part (17)
The sealing surface (S2) is formed on the rear surface of c), and the lower surface of the blade portion (17c) is formed on the operating mechanism (19, 20,
22) A blade adjusting device for an ink fountain in a printing machine, which is pressed upward against the elastic force of the leaf spring portion (17b) by means of 22). 3. The seal surface (S) according to claim 2,
1, S2) is an ink fountain blade adjusting device in a printing machine, which is formed in parallel with a rotation locus of the blade portion (17c) generated by elastic deformation of the leaf spring portion (17b). 4. The operating mechanism (19, 20, 22) according to claim 2 or 3, wherein a rotary support shaft is rotatably supported by a fountain base constituting the ink fountain, and a rotary operation is performed at one end thereof. For adjusting the ink fountain blade in a printing press, which is configured by connecting an operating knob or a motor for use with a cam member that presses the lower surface of the blade portion to move it forward and backward. 5. The rotary support shaft (19) according to any one of claims 2 to 4, wherein the rotary support shaft (19) is supported so that its axial position can be adjusted, and the cam member (20) is moved in the central axis (O) direction. A blade adjusting device for an ink fountain in a printing press configured to push and move an inclined cam surface (17d) formed on the lower surface of the blade portion (17c) to move back and forth. 6. The method according to any one of claims 2 to 5,
The cam member (20) is formed on the first arcuate cam surface (K1) having a gentle slope in the range of 180 °, and is formed on the second arcuate cam surface (K2) having a large slope in the remaining range of 180 °. Ink fountain blade adjustment device in a printing press. 7. The method according to any one of claims 2 to 6,
A locking groove (19b) is formed on the outer peripheral surface of the rotary support shaft, and a biasing member (32) locked to the locking groove (19b) is attached to a part of the crucible base. A blade adjusting device for an ink fountain in a printing press, wherein a biasing member (32) presses and biases a rotary support shaft (19) in a thrust direction to hold a cam member in a rotationally adjusted predetermined position.