JPH0418848Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a doctoring device used in a rotary printing press, and in particular, the invention relates to a doctoring device used in rotary printing presses, and in particular, the invention relates to a doctoring device for use in a rotary printing press, and in particular, the invention is directed to a doctoring device that is capable of doctoring at a substantially constant position and angle from the plate cylinder reference position regardless of changes in the plate cylinder diameter. This invention relates to a doctor angle changing device that can set the blade.

[Conventional technology]

In a conventional doctor device, a doctor holder holding a doctor blade is rotatably attached to a doctor holding shaft, and the doctor holding shaft is held by a swing arm located diagonally below the plate cylinder. Further, this doctor holding shaft is also movable in the longitudinal direction with respect to the swing arm. In such a conventional doctor device, in order to adjust the mounting position of the doctor blade, the swing arm is used to mainly adjust the position of the doctor blade in the lateral direction with respect to the plate cylinder, and the doctor holding shaft is moved up and down along the swing arm. By moving the doctor holder, the position is mainly adjusted in the vertical direction, and by rotating the doctor holder relative to the doctor holding shaft,
The operation involves adjusting the angle at which the doctor blade is attached to the plate cylinder.

[Problem that the invention attempts to solve]

However, such conventional devices have a problem in that it is extremely difficult to adjust the position of the doctor blade. That is, the movement of the swinging arm, the movement of the doctor holding shaft along the swinging arm, and the rotation of the doctor holder relative to the doctor holding shaft all
Since the doctor blade is moved more or less horizontally and vertically and the angle with respect to the plate cylinder is changed, it is extremely difficult to adjust the doctor blade to a desired position and angle depending on the diameter of the plate cylinder. Furthermore, in the past, it was not clear at what position and at what angle the doctor blade should make contact with the plate cylinder, and the adjustment work relied on the experience and intuition of the operator. For this reason, there was a problem in that a skilled person was required.

The present invention has been devised in view of such conventional problems, and an object of the present invention is to provide a doctor angle changing device that can extremely easily adjust the contact position and angle of the doctor blade with respect to the plate cylinder, regardless of the plate cylinder diameter. With the goal.

[Means for solving problems]

As a result of intensive studies to solve this problem, the inventor of the present invention has developed a method that maintains the doctor blade at a constant contact angle with the outer periphery of the plate cylinder, regardless of the size of the plate cylinder diameter, and maintains contact between the plate cylinder and the impression cylinder. They discovered that good printing is possible by contacting the doctor blade at a certain distance along the outer surface of the plate cylinder from a point, and that such position adjustment of the doctor blade can be easily achieved by a link mechanism. I found it.

The present invention has been made based on this knowledge, and as seen in the illustrated embodiment, the first arm 1 is swingable about the first fulcrum A above the plate cylinder 1.
3, a second arm 16 that is swingable about a second fulcrum B above the plate cylinder, a first link 17 connected to the first arm and the second arm, and a second arm 16 held by the first link. It has a doctor holding shaft 5 and a doctor holder 6 held on the doctor holding shaft, and the doctor holder is rotatable about the central axis of the doctor holding shaft with respect to the first link, and A second link 22 connecting the doctor holder to the second arm so as to rotate the doctor holder relative to the first link in response to rotation between the first link and the second arm.
The gist of the present invention is a doctor angle changing device for a printing press, which is characterized by having the following.

[Effect]

In the above configuration, the doctor holding shaft 5 is held at a position determined by the first arm 13, the second arm 16, and the first link 17, and the angular position of the doctor blade 3 with respect to the plate cylinder is determined by the first link 1.
7, the second arm 16 and the second link 22. When the plate cylinder 1 shown in FIG. 1 is replaced with one of a different diameter shown in FIG. 2, the first arm 13 is pivoted about the first fulcrum A. This rotation causes the doctor holding shaft 5 to move and the tip of the doctor blade 3 to come into contact with the outer peripheral surface of the plate cylinder 1A. The contact position and contact angle at this time are determined by the lengths of the first and second arms, the first and second links, and the mounting position, but if these are set appropriately, the plate cylinder diameter will be 400 mm.
~900 mm, the contact point E between the plate cylinder and the doctor blade is approximately a constant distance l along the outer surface of the plate cylinder from the contact point C between the plate cylinder and impression cylinder, and the doctor blade at that time The contact angle with the barrel surface is a substantially constant value θ. Thus, by simply pivoting the first arm 13, the doctor blade can be brought into contact with the plate cylinder 1 at a substantially constant position and at a substantially constant angle.

〔Example〕

Hereinafter, preferred embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a schematic diagram of a doctor angle changing device that is an embodiment of the present invention. In the figure, 1 is a plate cylinder, 2 is an impression cylinder, 3 is a doctor blade, 4 is a doctor pedestal holding the doctor blade 3, and 5 is a doctor holding shaft. Doctor pedestal 4 is the third
As shown in Figures 5 to 5, a rotatable doctor holder 6 is attached to a doctor holding shaft 5, and a worm wheel 7 is fixed to one end of the doctor holder 6. The doctor holding shaft 5 further rotatably holds a housing 8, and the housing 8 rotatably holds an adjustment shaft 10 holding a worm 9 that engages with the worm wheel 7. Thus, by rotating the adjustment shaft 10, the doctor holder 6 is moved into the housing 8.
Rotate against.

Referring again to FIG. 1, reference numeral 11 denotes a drive shaft rotatably held in the frame 12 of the printing press above the plate cylinder 1, and a first arm 13 is fixed to this drive shaft 11. Therefore, the first arm 13 swings about the center A of the drive shaft 11 (hereinafter referred to as the first fulcrum) due to the rotation of the drive shaft 11. A fulcrum shaft 15 is located above the plate cylinder 1 and below the drive shaft 11, and is fixed to the frame 12. A second arm 16 is rotatably held on this fulcrum shaft 15. Therefore, the second arm 16 swings about the center B of the fulcrum shaft 15 (hereinafter referred to as the second fulcrum). A first link 17 is held at the tips of the first arm 13 and the second arm 16 by pins 18 and 19. The first link 17 extends further downward beyond the connecting portion with the second arm 16, and the doctor holding shaft 5 is fixed to its lower end. As described above, since the doctor holder 6 is rotatable with respect to the doctor holding shaft 5, the doctor holder 6 is rotatable with respect to the first link 17 about the central axis of the doctor holding shaft. Note that in order to make the doctor holder 6 rotatable relative to the first link, it is not necessary to make the doctor holder 6 rotatable relative to the doctor holding shaft 5 as in the illustrated embodiment; 5 may be rotatable relative to the first link 17.

A second link 22 is connected to an intermediate position of the second arm 16 by a pin 21.
2 is a housing 8 held on the doctor holding shaft 5
is connected by a pin 23. As described above, the housing 8 is connected to the doctor holder 6 via the worm 9 and the worm wheel 7, and rotates together with the doctor holder 6 relative to the doctor holding shaft 5, so the second link 22 eventually The arm 16 will be connected to the doctor holder 6.

An arm 25 is fixed to the drive shaft 11 holding the first arm 13, and the arm 25 is connected to the screw shaft 2 through an air cylinder 26, links 27, 28, etc.
A doctor lifting handle 31 is connected to the end of the screw shaft 29. Thus, the rotation of the handle 31 is
is moved along the screw shaft 29, and the links 28, 2
7. Rotate the drive shaft 11 via the air cylinder 26 and arm 25.

Next, the operation of the above device will be explained. In FIG. 1, the doctor holding shaft 5 is at a position determined by the first arm 13, the second arm 16, and the first link 17, and the doctor blade 3 is moved from the contact point C between the plate cylinder 1 and the impression cylinder 2 to the plate cylinder 1. is in contact with a point D located a predetermined distance l along the outer surface of the . At this time, since the second link 22 connects the second arm 16 and the housing 8, the angular position of the housing 8 is determined, and therefore the angular position of the doctor holder 6 is also determined. The contact angle is determined. Let this contact angle be θ. Note that θ can be adjusted by rotating the adjustment shaft 10. During printing, the air cylinder 26 urges the arm 25 downward, which causes the doctor blade 3 to
A pressing force is applied to the plate cylinder surface.

For example, the plate cylinder 1 is a small diameter plate cylinder 1A as shown in FIG.
If the lifting handle 3 in Fig. 1 is replaced with
1 to rotate the screw shaft 29 so that the nut 30 moves to the right. As a result, the arm 25 rotates downward, causing the drive shaft 11 to rotate counterclockwise. As a result of this rotation, as shown in FIG. 2, the first arm 13 pivots downward centering on the first fulcrum A, and following this, the second arm 16 also pivots centering on the second fulcrum B, and both arms The link 17 held in is also moved to the illustrated position. As a result, the doctor holding shaft 5 descends. At the same time, the housing 8 is connected to the second arm 16 by the second link 22.
The doctor holding shaft 5 pivots to follow the swinging motion of the doctor holding shaft 5. As the lifting handle 31 continues to rotate, the doctor blade 3 eventually comes into contact with the outer periphery of the plate cylinder 1A. The contact position and contact angle between the doctor blade 3 and the plate cylinder surface at this time are determined by the mounting positions and lengths of the first arm, second arm, first link, and second link. By setting the plate cylinder diameter within the range of about 400 to 900 mm,
The contact point E between the plate cylinder and the doctor blade is approximately a constant distance l along the outer surface of the plate cylinder from the contact point C between the plate cylinder and the impression cylinder, and the contact angle of the doctor blade with the plate cylinder surface at that time is approximately constant. It has been confirmed that the value θ is the same, and the illustrated embodiment is designed to do so. Thus, the doctor lifting handle 3
1, the doctor holding shaft 5 moves, and at the same time the doctor holder moves to the doctor holding shaft 5.
The doctor blade automatically rotates around the
The plate cylinder and the impression cylinder make contact at a position approximately a constant distance l along the outer surface of the plate cylinder from the point of contact C at a nearly constant contact angle θ, and the doctor blade is adjusted according to the plate cylinder diameter. becomes unnecessary.

In the above embodiment, the second link 22 is connected to the housing 8, and a holder angle adjustment mechanism consisting of the worm wheel 7 and the worm 9 is interposed between the housing 8 and the doctor holder 6. If adjustment of the mounting angle is not necessary, the second link 22 may be directly connected to the doctor holder 6. Further, in the above embodiment, as a means for swinging the first arm 13,
Although the screw shaft 29, nut 30, and link mechanism are used, the means for swinging the first arm 13 is not limited to this mechanism, and any known means can be used.

[Effect of idea]

As explained above, according to the present invention, by simply swinging the first arm 13 and bringing the tip of the doctor blade into contact with the plate cylinder, the doctor blade is always connected to the plate cylinder regardless of the size of the plate cylinder diameter. This makes it possible to make contact at a nearly constant angle from the upper reference position (point of contact with the impression cylinder) at a nearly constant position along the circumference, making it extremely easy to adjust the doctor blade. .

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
Figure 2 shows the first plate explaining the case where a small-diameter plate cylinder is used.
3 is a sectional view showing the vicinity of the end of the doctor holding shaft, and FIG. 4 is a schematic diagram of the main parts of the figure.
5 is a side view of a portion of the housing 8. FIG. 1... Plate cylinder, 2... Impression cylinder, 3... Doctor blade, 5... Doctor holding shaft, 6... Doctor holder, 8... Housing, 11... Drive shaft, 1
3...First arm, 16...Second arm, 17...
...First link, 22...Second link, 26...Air cylinder, A...First fulcrum, B...Second fulcrum.

Claims (1)

[Scope of utility model registration request] a first arm that is swingable about a first fulcrum above the plate cylinder; a second arm that is swingable about a second fulcrum above the plate cylinder; and a second arm that is connected to the first arm and the second arm. It has a first link, a doctor holding shaft held by the first link, and a doctor holder held by the doctor holding shaft, and the doctor holder has a center axis of the doctor holding shaft with respect to the first link. a third arm rotatable about the second arm and further coupling the doctor holder to the second arm so as to rotate the doctor holder relative to the first link in response to rotation between the first link and the second arm; A doctor angle changing device for a printing press, characterized by having two links.