JPH04372350A - Automatic doctor polishing machine - Google Patents

Abstract

PURPOSE:To automate the polishing work of the doctor blade of a doctor used for a gravure printing machine or the like so as to enable uniform polishing in a short time. CONSTITUTION:A doctor 3 is fixed to the upper face of a doctor polishing base, and a polishing machine body 16 is placed on the doctor 3. A contact member 29 is provided at the lower part of the polishing machine body 16. A doctor blade 3b is inserted into an opening part 30 provided at the lower face of the contact member 29, and with the self-weight of the polishing machine body 16, the tip of the doctor blade 3b is brought into contact with a rubber pad 31 provided at the innermost part of the opening part 30 through sand paper 27. The polishing machine body 16 is reciprocated along the doctor 3 by the mesh between a rack 20 and a pinion gear 19 driven by an air motor 17 to polish the doctor blade 3b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic doctor polishing machine for polishing a doctor blade used in a gravure printing machine or the like.

0002

[Prior Art] Generally, in an intaglio printing machine such as a gravure printing machine, ink is applied to the entire plate surface of a plate cylinder, and after the excess ink on the plate surface is scraped off with a doctor, the plate cylinder and the press bonded to it are coated with ink. Printing is performed by transferring ink to the paper that passes between it and the impression cylinder. By the way, if the doctor used in such an intaglio printing machine is used for a long time, the doctor blade that comes into direct contact with the plate cylinder will wear out, making it impossible to sufficiently scrape off ink from the plate surface. Since ink unevenness occurs in the finished printed matter, it is necessary to polish the printing machine every time it is used for a certain period of time. Conventionally, this kind of polishing work was usually done manually inside the printing machine before it started operating, and specifically, the operator wore gloves and held a grindstone while polishing. In that case, usually after rough polishing is performed with a coarse grindstone, final polishing is performed with a fine grindstone.

[0003] Conventionally, there is also known a device that automates the work of cutting and grinding the tip of a worn doctor blade. A doctor blade grinder for an intaglio printing press disclosed in Japanese Utility Model Application Publication No. 59-9808 is an example of this, and in this grinder, a slide table is provided in front of a bed that supports a doctor so that it can slide horizontally and vertically. A grinding wheel is attached to a rotating shaft provided on the slide table, and the side surface of the grinding wheel cuts the tip of the doctor blade, and the outer surface and side surface grind the surface portion of the blade tip. ing.

0004

[Problems to be Solved by the Invention] However, with the conventional manual polishing method, there is a problem that polishing takes time, which contributes to an extension of print preparation time, and it is difficult to polish uniformly. This required the operator's skill, and there was also the problem that the polishing work itself was dangerous.

[0005] Furthermore, as described in the above publication, a grinding machine in which the tip of the doctor blade is ground with a rotary grinding wheel has been proposed; Even if such a grinder is used for cutting and rough-machining, the final polishing work must still be done manually.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an automatic doctor polishing machine that can automate the polishing work of the doctor blade of a doctor and polish it uniformly and in a short time. With the goal.

[0007]

[Means for Solving the Problems] An automatic doctor polishing machine according to the present invention is an automatic doctor polishing machine that automatically polishes a doctor blade of a doctor for scraping off excess ink adhering to a plate surface. a self-propelled polishing machine body that can reciprocate along a doctor blade fixed on the base, a polishing member installed in the polishing machine body for polishing the doctor blade, and a polishing machine. A contact member is provided at the bottom of the main body to bring the polishing member into contact with the doctor blade, and the polisher main body is moved back and forth by pressing the polishing member against the doctor blade via the contact member by the weight of the polisher main body. It is characterized by the fact that the doctor blade is polished.

[0008] Here, an opening into which a doctor blade is inserted is provided on the lower surface of the abutment member along the moving direction of the polishing machine body, and the width of this opening is set in a direction perpendicular to the moving direction of the polishing machine body. Adjustment can be made by a slide piece that is movable, and a rubber pad that contacts the doctor blade via an abrasive member may be provided above the opening.

Further, it is preferable that the polishing member is sandpaper, and the polishing machine body is provided with a feed-out reel for feeding out the sandpaper and a take-up reel for winding up the sandpaper fed out from the feed-out reel. It is better.

[0010] Furthermore, an air motor and a pinion to which the driving force of the air motor is transmitted are provided on the main body of the polishing machine, and a rack that meshes with the pinion is provided on the base. It is preferable to make the polishing machine main body move on its own by doing so.

[0011] It is also possible to integrate the doctor stock stand and the polishing machine by attaching the base to the upper part of a doctor stock stand that stores a plurality of doctors.

0012

[Operation] Fix the doctor on the base so that the doctor blade is on top, place the sanding machine main body on top of it, and use the sandpaper, for example, through the contact member provided at the bottom of the sanding machine main body. The abrasive member is brought into contact with the doctor blade. In this state, when the polisher body is moved back and forth along the doctor blade by a drive mechanism consisting of an air motor, pinion gear, rack, etc., the polishing member is pressed against the doctor blade by the weight of the polisher body and moves. This automatically sharpens the doctor blade.

In this case, if an opening is provided on the bottom surface of the abutment member into which the doctor blade is inserted, and a rubber pad is provided on the top of the opening, the cushioning properties of the pad will allow the abrasive member to come into uniform contact with the doctor blade. Polishing accuracy can be further improved. In addition, after the doctor blade is brought into contact with the rubber pad via the polishing member, by moving the slide piece provided on the lower surface of the contact member, the polishing member can be pressed against the side surface of the doctor blade. Thereby, it is also possible to polish the polishing surface from the cutting edge of the doctor blade to the printing plate side into a desired shape.

[0014] Furthermore, when the sandpaper is used as the polishing member, if the sandpaper is fed out from the feed reel and wound up on the take-up reel, after the sandpaper main body has been reciprocated a predetermined number of times, the unused sandpaper can be removed. It becomes possible to continuously unroll the surfaces one after another, making polishing work more efficient.

[0015] Furthermore, if the base is attached to the upper part of a doctor stock stand that stores a plurality of doctors, the doctor stock stand and the polishing machine can be integrated, which further improves convenience. do.

[0016]

[Embodiment] Hereinafter, an embodiment will be explained based on the drawings.

FIG. 1 is a perspective view showing the overall configuration of an automatic doctor polishing machine according to an embodiment of the present invention, FIG. 2 is a perspective view of the polishing machine main body in the same embodiment, and FIG. 3 is a contact diagram of the polishing machine main body. FIG. 4 is a side view showing the polishing machine of the same embodiment in the polishing state, FIG. 5 is an enlarged view of the main part of FIG. 4, and FIG. 6 is the polishing machine of the same embodiment. FIG. 2 is a perspective view of the main parts of the polishing machine before setting the doctor and polishing machine main body.

In this embodiment, the polishing machine 1 is attached to the upper part of the doctor stock stand 2, and the two are integrally formed. The doctor stock stand 2 has a well-known structure, and is equipped with a spare doctor stock 3.
It has multiple shelves 4 on which are placed, and is movable by casters 5 provided at the bottom.

L-shaped brackets 7 are fixed to the upper ends of the pillars 6 erected on the left and right sides of the doctor stock table 2, and a substantially flat doctor polishing table 8 is provided on the upper surface thereof. A pair of substantially U-shaped doctor support stands 9 are fixed to the upper surface of the doctor polishing table 8 near the left and right ends, and each doctor support stand 9 is provided with a support screw 10. Both ends of the doctor 3 to be polished are placed on the doctor support stand 9 on the doctor polishing table 8, and the support screw 10
It is fixed on the doctor support stand 9 by tightening. Here, the doctor 3 is the doctor holder 3a.
A doctor blade 3b is fixed to one side, and the doctor blade 3 is arranged so that the doctor blade 3b is positioned upward on the doctor support stand 9, and
The tip of b is fixed in a substantially vertical position.

A pair of pillow blocks 11 is fixed to the upper surface of each of the left and right brackets 7 at positions facing each other. A support shaft 12 is pivotally supported on these pillow blocks 11, and a lever 13 is fixed to one end of the support shaft 12. Further, the base end portions of arms 14 are fixed to the support shaft 12 in the vicinity of both ends of the support shaft 12, and a rotating base 14 is provided between the distal ends of the arms 14 in parallel with the support shaft 12.
5 is provided. By rotating the support shaft 12 with the lever 13, the rotary table 15 moves approximately 90 degrees between the set position of the doctor 3 (the position shown in FIG. 6) and the polishing position (the position shown in FIGS. 1 and 4). It can be rotated within a range of °. The rotary table 15 sets the doctor 3 on the doctor support table 9 with the lever 13 rotated so as to be positioned above the pillow block 11, and then the lever 13 is rotated to the polishing position. Although not clearly shown in the drawings, the pillow block 11 is provided with stoppers for holding the support shaft 12 at the setting position of the doctor 3 and at the polishing position, respectively.

After the rotary table 15 is rotated to the polishing position by the lever 13, a separate polishing machine main body 16 is placed above the doctor 3 set on the doctor support table 9. This polishing machine main body 16 is equipped with an air motor 17 that can freely rotate in forward and reverse directions by switching the air feeding direction. A pinion gear 1 protrudes from the side of the polishing machine body 16 via a mechanism.
9. This pinion gear 19 meshes with a rack 20 provided on the upper surface of the rotating table 15 along the longitudinal direction of the rotating table 15. Further, a guide plate 21 is fixedly installed along the longitudinal direction of the polishing machine main body 16 on the side of the polishing machine main body 16 on the side of the pinion gear 19,
A pair of rollers 22, 2 are provided near both ends of the guide plate 21.
2 is rotatably supported. These rollers 22,2
2 rolls along a guide rail 23 provided on one side of the rotating table 15 in the longitudinal direction of the rotating table 15. With this configuration, when the air motor 17 is rotationally driven, the pinion gear 19 rotates and meshes with the rack 20, and the rollers 22, 22 roll along the guide rail 23, so that the polishing machine main body 16 can move back and forth along the doctor 3.

Further, an arm member 24 is fixed to the polishing machine main body 16 and extends forward and backward around the output shaft of the air motor 17, and a feed reel 25 and a take-up reel are attached to both ends of the arm member 24. 26 are provided respectively. And each of these reels 25, 2
For example, a #4
00 sandpaper 27 is suspended. Further, each of the reels 25 and 26 has a locking screw 28.
, 28 are attached.

[0023] A contact member 29 is provided at the lower part of the polishing machine main body 16 and comes into contact with the doctor blade 3b of the doctor 3 to be polished. As shown in an enlarged view in FIG. A pad 31 is buried therein. Contact member 29
The lower surface has a step on the left and right sides at the position of the opening 30, and the feed reel 25 side is shaped to protrude downward.
The side surface of the winder 0 on the take-up reel 26 side is opened downward. Further, a slide piece 32 movable in the left-right direction (in the direction of the arrow) is fitted into the lower surface of the feed reel 25 side. This slide piece 32 is
The abutting member 29 is moved by rotating an eccentric roller 33 provided on the side thereof by operating a handle 34, thereby making it possible to adjust the width of the opening 30.

Furthermore, an oil cup 35 is attached to the front part of the polishing machine main body 16. This oil cup 35
A bifurcated member 35a is attached to the lower part of the holder, and a felt (not shown) is provided within the bifurcated member 35a. When the polishing machine main body 16 is set on the doctor blade 3, the forked member 35a of the oil cup 35 is attached to the doctor blade 3.
b, and the felt impregnated with oil contacts the doctor blade 3b. In addition, what is shown by the code|symbol 36 in the figure is the silencer attached to the air motor 17.

Further, limit switches 37 are provided on the left and right brackets 7 of the doctor stock table 2 so as to protrude above the doctor polishing table 8. By contacting a predetermined portion of the polishing machine body 16, the limit switch 37 defines the movement range of the polishing machine body 16 and switches the rotational direction of the air motor 17.
It serves to detect the number of reciprocating movements of the polishing machine main body 16. Furthermore, an operation box 38 for controlling the drive of the polishing machine main body 16 is provided on the pillar 6 at one end of the doctor stock table 2, and the operation box 38 sets and displays the number of reciprocating movements of the polishing machine main body 16, etc. A counter 39 is provided for this purpose.

The polishing machine 1 of this embodiment constructed as described above operates as follows.

First, with the lever 13 rotated to the setting position of the doctor 3, the doctor 3 to be polished is set at a predetermined position on the doctor support stand 9 and fixed with the support screw 10. Rotate to the polishing position.

Next, the pinion gear 19 is adjusted so that the doctor blade 3b is inserted into the opening 30 of the contact member 29.
The polishing machine main body 16 is placed from above so that the rollers 22, 22 engage with the guide rail 23 and engage with the rack 20. Next, operate the handle 34 to move the eccentric roller 33.
is rotated to move the slide piece 32 toward the doctor blade 3b side. At this time, the tip of the doctor blade 3b comes into contact with the rubber pad 31 via the sandpaper 27, so that the sandpaper 27 is pressed against the doctor blade 3b by the weight of the polishing machine main body 16, and the opening 3
The slide piece 32 side inside the slide piece 32 is pressed against one side of the doctor blade 3b by tension.

In this state, by operating the operation button of the operation box 38, the air motor 1 of the polishing machine main body 16 is activated.
7 is driven to rotate the pinion gear 19, and the polishing machine main body 16 is moved along the guide rail 23. When the polishing machine main body 16 is moved, the polishing surface of the doctor blade 3b is polished by the sandpaper 27 while being smoothly maintained by a film of oil supplied from the oil cup 35.

When the polishing machine main body 16 moves to the end of the doctor polishing table 8, the rotation direction of the air motor 17 is switched by the operation of the limit switch 37, whereby the polishing machine main body 16 is automatically reciprocated. The limit switch 37 also detects the number of reciprocating movements of the polishing machine main body 16, and the detected value is displayed on the counter 39.

When the polishing machine main body 16 has reciprocated a predetermined number of times (for example, 20 reciprocations), polishing is completed. Here, the locking screws 28, 28 are operated every predetermined number of times the polishing machine main body 16 is moved, and the unused surface of the sandpaper 27 is sequentially fed out. Note that the number of reciprocating movements of the polishing machine main body 16 can be set by the counter 39, and thereby the polishing machine main body 16 can be automatically stopped.

FIG. 7 is a diagram illustrating the operation of scraping off ink from the plate surface by the doctor blade, and FIG. 8 is a diagram showing the doctor blade after use and after polishing. As shown in the figure, when the ink 41 on the surface of the plate cylinder 40 is repeatedly scraped off by the doctor blade 3b, the tip of the doctor blade 3b is scraped off by the plate cylinder 40 as shown in FIG. 8(a). When the doctor blade 3b after such use is polished using the polishing machine 1 of this embodiment, the doctor blade 3b
The tip of b has a shape as shown in FIG. 8(b). Note that the range indicated by the arrow in FIG. 8(b) is the polished surface.

According to this embodiment, an air motor is used as the drive source, so there is an explosion-proof effect, and it is safe to use this polishing machine 1 near rotogravure printing machines that use a lot of solvents. It is possible to ensure sex. In addition, if the place of use is not restricted, it is also possible to use, for example, a rechargeable electric motor instead of the air motor.

[0034] In the above embodiment, the polishing machine is integrally installed on the top surface of the doctor stock table, but the polishing machine may be formed as a single unit, and in that case, the rack and guide rails are provided. It is also possible to make the fixed table (rotating table) fixed and the doctor polishing table movable.

[0035]

[Effects of the Invention] Since the present invention is configured as described above, it is possible to automate the polishing work of the doctor blade of the doctor used in the gravure printing machine, eliminating the work that requires skill and allowing anyone to do it uniformly. Furthermore, polishing can be completed in a short time, and disasters can be avoided during polishing.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration of an automatic doctor polishing machine according to an embodiment of the present invention.

[Fig. 2] A perspective view of the polishing machine main body in the same embodiment.

[Figure 3]
A perspective view of only the contact member in the main body of the polishing machine seen from below.

[Fig. 4] Side view showing the polishing machine of the same example in the polishing state

[Figure 5] Enlarged view of main parts of Figure 4

[Fig. 6] A perspective view of the main parts of the polishing machine of the same embodiment before setting the doctor and the polishing machine main body.

[Figure 7] Diagram explaining the ink scraping operation using the doctor blade

[Figure 8] Diagram showing the state of the doctor blade after use and after polishing

[Explanation of symbols]

1 Polishing machine 2 Doctor stock stand 3 Doctor 3b Doctor blade 8 Doctor polishing table (base) 16 Polishing machine body 17 Air motor 19 Pinion gear 20 rack 25 Payout reel 26 Take-up reel 27 Sandpaper 29 Contact member 30 Opening 31 Pad 32 Slide part

Claims (5)

[Claims] 1. An automatic doctor polishing machine that automatically polishes a doctor blade of a doctor for scraping off excess ink adhering to a printing plate, comprising: a base for fixing the doctor; and a base fixed on the base. a self-propelled polishing machine main body capable of reciprocating along a doctor blade; a polishing member provided on the polishing machine main body for polishing the doctor blade; and a polishing member provided at the bottom of the polishing machine main body for polishing the doctor blade. and a contact member brought into contact with the doctor blade, and the polisher main body is moved back and forth by pressing the polishing member against the doctor blade via the contact member by the own weight of the polisher main body. An automatic doctor polisher characterized by polishing the blade. 2. An opening into which a doctor blade is inserted is provided on the lower surface of the abutment member along the moving direction of the polishing machine body, and the width of the opening extends in a direction perpendicular to the moving direction of the polishing machine body. Claim 1: Adjustment is made possible by a movable slide piece, and a rubber pad is provided above the opening to abut the doctor blade via a polishing member.
The automatic doctor polishing machine described. 3. The polishing member is sandpaper, and the polishing machine body is provided with a feed-out reel for feeding out the sandpaper and a take-up reel for winding up the sandpaper fed out from the feed-out reel.
The automatic doctor polishing machine described. 4. The polishing machine according to claim 1, wherein the main body of the polishing machine is provided with an air motor and a pinion gear to which the driving force of the air motor is transmitted, and a rack is provided on the base to mesh with the pinion gear. The automatic doctor polishing machine described in 3. [Claim 5] Claim 1, wherein the base is attached to the upper part of a doctor stock stand for storing a plurality of doctors.
Automatic doctor polishing machine according to 2, 3 or 4.