JPS6343083Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a doctor device for scraping ink off a plate cylinder in a rotary printing press.

[Conventional technology]

Generally, a conventional doctor device has a structure in which a shaft supporting a doctor blade is supported by a support mechanism installed diagonally below the plate cylinder (see, for example, Japanese Utility Model Publication No. 49-37285).

[Problems to be solved by the invention] However, with this structure, the support mechanism gets in the way when replacing the plate cylinder or cleaning the ink pan, resulting in poor workability. In particular, the present applicant has recently developed a system in which inking devices such as an ink pan, ink pump, and ink tank, and a plate cylinder are placed on a trolley to form a unit, and by exchanging the unit, the plate cylinder and inking device can be quickly replaced. However, at this time, the doctor device became a major hindrance to unit replacement.

Furthermore, Japanese Utility Model Publication No. 39-13318 proposes a doctor device in which brackets are attached to both ends of a shaft that supports a doctor blade, and each bracket is supported by a suspension rod suspended from above. , if you use this doctor device,
It is believed that a work space can be formed below the doctor blade, making it easier to replace the plate cylinder and clean the ink pan. However, in this doctor device, when vertically adjusting the doctor blade, the suspension rods that hold the left and right brackets are rotated independently, and the suspension rods that hold the left and right brackets are rotated independently, and the doctor blade is suspended by screws formed at the upper end of each suspension rod. Since the rod is configured to move up and down, it is difficult to move the left and right brackets up and down evenly, causing the problem that the parallelism of the doctor becomes out of order and the parallelism of the doctor must be adjusted each time the doctor is adjusted up and down. Also, since the suspension rod moves the bracket vertically up and down, when the diameter of the plate cylinder is changed and the height of the doctor blade is adjusted using the suspension rod, the tip of the doctor blade will move vertically up and down. There is no displacement in the front-back direction. Generally, the contact point of the doctor blade with the plate cylinder is a certain arc length away from the printing position (the point of contact between the plate cylinder and the impression cylinder, which is usually on the vertical axis passing through the center of the plate cylinder). Therefore, in the case of a large-diameter plate cylinder, it is desirable that the tip of the doctor blade be shifted in the front-back direction by an amount corresponding to a larger radius than in the case of a small-diameter plate cylinder. It is not possible to displace the tip of the doctor blade in the front-back direction by adjusting the suspension rod. Therefore, each time the height of the doctor blade is adjusted according to the diameter of the plate cylinder, it is necessary to adjust the position of the bracket in the longitudinal direction, which poses a problem of poor workability.

This invention was created in view of these problems.
By suspending the doctor device from above, a space is created below the plate cylinder, making it easy to replace the plate cylinder and inking device, as well as cleaning, etc., and also to make it easier to replace the doctor blade when replacing the plate cylinder. It is an object of the present invention to provide a doctor device that can easily adjust its position in the vertical and longitudinal directions.

[Means to solve the problem]

The present invention consists of a pair of guide members attached to machine frames located on both sides of the plate cylinder with their lower ends inclined in a direction approaching a vertical axis passing through the center of the plate cylinder, and a pair of guide members that are slidable on the guide members. a pair of held holding arms, a rack attached to each holding arm, a rotating shaft rotatably spanned over the machine frames on both sides and equipped with a pinion that meshes with the rack, and a lower end of the holding arm, A support shaft rotatably held, a doctor blade held on the support shaft, a worm wheel fixed to the support shaft, and a housing arranged surrounding the worm wheel and rotatable with respect to the support shaft. , comprising an adjustment shaft provided in the housing and having a worm that engages with the worm wheel, and a hydraulic cylinder provided between the housing and the holding arm to apply a torque to the housing. The main topic is the doctor device of a printing press.

[Effect]

As mentioned above, in this invention, the support shaft that supports the doctor blade is attached to the lower ends of the pair of holding arms located on both sides of the plate cylinder, so the support mechanism for the doctor blade is located on the side and above the doctor blade. This allows a large space to be created under the doctor blade. To adjust the doctor blade up and down, rotate the rotating shaft. The rotation of this rotating shaft is transmitted to the holding arms on both sides by the engagement of the rack and pinion, and the pair of holding arms move up and down in synchronization. Therefore, the doctor blade moves up and down while keeping parallel to the plate cylinder, and there is no need for parallel adjustment of the doctor blade. Furthermore, since the guide member that guides the holding arm is installed with its lower end inclined in a direction approaching the vertical axis passing through the center of the plate cylinder, the holding arm also moves up and down in a direction inclined to the vertical line. , the doctor blade held at its lower end approaches a vertical axis passing through the center of the plate cylinder as it moves downward. Therefore, when the holding arm is moved up and down to adjust the position of the doctor blade to a height position according to the plate cylinder diameter, the tip of the doctor blade is also moved in the front and back direction, and the position of the doctor blade is adjusted to a suitable position on the plate cylinder's outer periphery. This makes it easy to adjust the position in the front-back direction.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to embodiments of the accompanying drawings.

In FIG. 1, a doctor device 1, which is an embodiment of the present invention, includes a pair of holding arms 4 disposed along machine frames 3, 3 on both sides of a plate cylinder 2;
It has 4. The holding arms 4, 4 have a groove 4A on the side surface, and the groove 4A engages with a projection 5A of a guide member 5 fixed to the frame 3, as shown in FIGS. 2 and 3. The holding arm 4 is thus able to slide up and down along the guide member 5. As can be clearly seen from FIG. 2, the guide member 5 is installed with its lower end inclined in a direction approaching a vertical axis passing through the center of the plate cylinder, and therefore, as the holding arm 4 moves downward, it moves closer to the plate cylinder. It also moves forward and backward to get closer to the center of. The holding arm 4 further has a rack 6 on which the frames 3,
A pinion 8 provided on a rotary shaft 7 rotatably spanned over the shaft 3 is engaged with the pinion 8. The rotating shaft 7 is driven by a handle 9 via a worm wheel and a worm (not shown), and by turning the handle 9, the pair of holding arms 4, 4 is rotated.
move up and down at the same time.

A bearing block 10 is fixed to the lower end of the holding arm 4, and the bearing block 10 rotatably holds a support shaft 11, as best seen in FIG. A worm wheel 12 is fixed to a support shaft 11 near one of the holding arms 4, and a housing 13 rotatable with respect to the support shaft 11 is arranged around the worm wheel 12. The housing 13 has an adjustment shaft 15 having a worm 14 that engages with the worm wheel 12.
By rotating the adjustment shaft 15, the support shaft 11 can be rotated, and the angular position of the support shaft 11 with respect to the housing 13 can be adjusted. Housing 1
3 is formed with a lever 13A, one end of which is connected to a piston rod of a fluid pressure cylinder (for example, a pneumatic cylinder) 16 connected to the holding arm 4. The fluid pressure cylinder 16 acts to apply torque to the housing 13 and press the tip of the doctor blade held on the support shaft 11 against the plate cylinder 2 with an appropriate pressure, as will be described later.

Referring to FIGS. 4 and 5, the support shaft 11 is covered with a box 17 along almost its entire length, and the box 17 securely holds the doctor blade 18 by means of a clamper 19. This box 17 is held by linear bearings 20, 21 so as to be non-rotatable but slidable in the axial direction relative to the support shaft 11. A hole 11A is formed at the end of the support shaft 11, and a drive rod 22 inserted into the hole is connected to the box 17 via a connecting bolt 23. The drive rod 22 is reciprocated by an external drive (not shown), which causes the box 17 and doctor blade 18 to reciprocate laterally with respect to the plate cylinder 2. Box 17
A ring 24 and a cylinder 25 are attached to the end of the
On the other hand, a cylinder 26 slightly larger than the cylinder 25 is attached to the housing 13 as well. The cylinder 25 is inserted into the cylinder 26 to prevent ink scraped off by the doctor blade and surrounding dust from entering. In this embodiment, in order to hold the doctor blade 18 on the support shaft 11, a box 17 is used, and a linear bearing is placed inside the box so that it can move in the axial direction. This is extremely suitable for protecting against The blade support structure is not limited to that shown, and other structures may be used. In FIG. 5, reference numeral 27 indicates a blade position adjustment knob 28 for adjusting the position of the doctor blade 18 in the front-rear direction with respect to the box 17.
is a handle.

Next, a method of using the doctor device having the above configuration will be explained. In FIG. 2, during printing, the fluid pressure cylinder 16 operates to press the tip of the doctor blade 18 against the plate cylinder 2. If necessary, the angular position of the doctor blade 18 with respect to the lever 13A is adjusted by the adjustment shaft 15. Next, when changing the diameter of the plate cylinder, the handle 9 is turned to adjust the height position of the doctor blade 18 according to the diameter of the plate cylinder 2. Then, the rotating shaft 7 rotates, and due to the engagement between the pinion 8 and the rack 6, the pair of holding arms 4, 4 move up and down synchronously, and the supporting shaft 11 and the doctor blade 18 held thereon move against the plate cylinder 2.
Go up and down while maintaining parallelism. In this way, the doctor blade 18 and the support shaft 11 supporting it can be positioned at a desired height position only by operating the handle 9. Here, the second
As can be clearly seen from the figure, the holding arm 4 is designed to move up and down in an inclined direction. Therefore,
It is now assumed that the support shaft 11 is at a predetermined height position relative to the small-diameter plate cylinder, and that the tip of the doctor blade 18 is in contact with the plate cylinder 2 at a suitable position. If this plate cylinder is replaced with a larger diameter one,
The holding arm 4 is raised to raise the position of the support shaft 11 to a desired position corresponding to the change in diameter. Then, the support shaft 11 not only moves upward, but also moves backward (rightward in FIG. 2), and the tip position of the doctor blade 18 rises and moves backward, causing it to move against the plate cylinder. This will make contact with the desired location. Therefore, it is not necessary to adjust the position of the doctor blade in the longitudinal direction. Therefore,
The support shaft 11 is moved by moving the holding arm 4 in the inclined direction.
When the height is adjusted, the position can also be adjusted in the front-back direction at the same time, making it easier to adjust the blade position. Note that, if necessary, after adjusting the height position of the support shaft 11, the blade position adjustment knob 27 may be turned to finely adjust the longitudinal position of the doctor blade 18.

When replacing the plate cylinder, place the plate cylinder 2 on the ink pan below it, lower the ink pan, move the cart carrying the ink pan, and move the support shaft 11.
and carry it out under box 17. if,
At this time, if there is a possibility that the plate cylinder will hit the box 17, the box 17 may be raised by raising the holding arm 4.

[Effect of idea]

As described above, the present invention has a structure in which the support shaft 11 that holds the doctor blade is held at the lower end of the holding arm 4 that is held from above by the guide member 5, rack 6, pinion 8, rotating shaft 7, etc. can be,
In addition, since the angle adjustment of the doctor blade and the pressing of the doctor blade against the plate cylinder are performed by the worm wheel 12, worm 14, housing 13, fluid pressure cylinder 16, etc. located near or above the support shaft, the support shaft 11 and This has the effect that a large space can be left below the doctor blade 18, and that the plate cylinder and inking device can be replaced and cleaned easily.

Furthermore, since the pair of holding arms 4, 4 supporting both ends of the support shaft 11 are configured to move up and down in conjunction with the single rotating shaft 7 via the rack 6 and pinion 8, the support shaft 11 The doctor blade held therein can be raised and lowered while always keeping parallel to the plate cylinder, and parallel adjustment is not necessary.
Furthermore, since the holding arms 4 are configured to be raised and lowered at an angle with respect to the vertical, it is possible to adjust the position of the support shaft 11 to a height corresponding to the diameter of the plate cylinder and at the same time to displace it in the front-back direction. can. For this reason, there are effects such as extremely easy position adjustment work of the doctor blade.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a view taken from - arrow in Fig. 1, and Fig. 3 is a - arrow view in Fig. 2.
4 is a view taken along the - arrow in FIG. 2, and FIG. 5 is a view taken along the - arrow in FIG. DESCRIPTION OF SYMBOLS 1... Doctor device, 2... Plate cylinder, 3... Machine frame, 4... Holding arm, 5... Guide member, 6... Rack, 7... Rotating shaft, 8... Pinion, 9... Handle , 10...Bearing block, 1
1... Support shaft, 12... Worm wheel, 13
... Housing, 14 ... Worm, 15 ... Adjustment shaft, 16 ... Fluid pressure cylinder, 17 ... Box, 18 ... Doctor blade.

Claims (1)

[Scope of utility model registration request] A pair of guide members attached to machine frames located on both sides of the plate cylinder with their lower ends inclined in a direction approaching a vertical axis passing through the center of the plate cylinder, and a pair of guide members slidably held by the guide members. a holding arm, a rack attached to each holding arm, a rotating shaft rotatably spanned over the machine frames on both sides and having a pinion meshing with the rack, and a lower end of the holding arm rotatably held. a support shaft, a doctor blade held on the support shaft, a worm wheel fixed to the support shaft, a housing disposed surrounding the worm wheel and rotatable with respect to the support shaft, and A doctor for a printing press, characterized in that the adjustment shaft is provided with a worm that engages with the worm wheel, and a hydraulic cylinder is provided between the housing and the holding arm to apply a torque to the housing. Device.