JP3278258B2 - Doctor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doctor device for scraping off excess ink and applied matter adhering to a cylinder such as a plate cylinder in a gravure printing machine, a coater or the like.

[0002]

2. Description of the Related Art Conventionally, a doctor device used in a gravure printing machine includes, as shown in FIGS. 6 and 7, a doctor blade 1, a backing plate 2, 3 disposed on both sides thereof, and a doctor blade. A doctor holder 4 and a holder lid 5 that hold the first and backing plates 2 and 3 therebetween, a position fixing reference pin 6 for performing positioning by pressing the rear ends of the doctor blade 1 and the backing plates 2 and 3, A bolt 7 and a nut 8 for fixing the doctor lid 5 to the doctor holder 4 are provided. Here, only (usually the protruding length L ₁ is about 4 mm) to slightly protrude doctor blade 1 is its front end from the long side of the caul 2 are protected mostly in caul 2,3 In addition, the doctor blade 1 and the backing plates 2 and 3 have their tip portions extended from the doctor holder 4 and the holder lid 5 long (for example, about 35 mm), so that cushioning can be obtained when the cylinder comes into contact with the cylinder. It is possible to scrape the ink evenly. The doctor holder 4 and the holder lid 5 are fixed at a short pitch (for example, about 110 mm) by a large number of bolts 7 and nuts 8 so that the doctor blade 1 is not deformed in the longitudinal direction in a wavy manner.

In order to assemble the doctor device, first, a contact plate 3 is put on a doctor holder 4, a doctor blade 1 is put on the doctor plate 1, a contact plate 2 is put on the doctor plate 1, and a holder lid is put on the doctor plate. 5, the doctor holder 4 and the holder lid 5 were tightened by bolts 7 and nuts 8 to be integrated.

[0004]

However, in such a conventional structure, when disassembling the doctor device, a large number of bolts 7 are required.
It is necessary to completely remove the nut 8 from the nut and remove the holder lid 5 from the bolt 7. Also, when assembling the doctor device, the doctor holder 4 and the holder lid 5 are required.
It is necessary to insert a large number of bolts 7 and tighten the nuts 8, and there is a problem that much work time and work load are required. Furthermore, there were also problems such as bolt tightening sequence, individual differences in tightening pressure, and loss of bolts.

In addition, since protective plates are provided on both sides of the doctor blade to protect the doctor blade, the number of parts is increased, the assembling is troublesome, and the mounting accuracy is likely to be poor. In addition, since there are many paths for ink to enter the inside between the doctor holder and the holder lid, ink penetration is likely to occur, and the penetrated ink adheres to the position fixing reference pin, which may cause incorrect positioning of the doctor blade. There was also the problem of causing it.

The present invention has been made in view of the above-mentioned conventional problems, and does not require the work of mounting and removing bolts and nuts as in the case of disassembly and assembly, so that disassembly and assembly can be performed extremely easily. The aim is to provide a possible doctor device.

Another object of the present invention is to provide a doctor device in which the number of parts is reduced by eliminating the hitherto used contact plate and the number of ink entry paths to the doctor holder is reduced.

[0008]

According to the present invention, in order to solve the above-mentioned problems, holder lids for pressing and fixing a doctor blade against a support surface of a doctor holder are arranged at a plurality of places separated in the longitudinal direction. With a configuration that can be held down by multiple lid holders, the lid holders
At a position rearward of the rear end of the holder lid attached to the doctor holder, the fastener is attached with a fastener attached to the doctor holder, and the fastener is attached to the doctor holder, and the lid holder is attached. And a head that is provided on the support shaft so as to be able to contact the upper surface of the lid retainer and that tightens and loosens the lid retainer by rotating in the forward and reverse directions. .

Here, it is preferable that an operation lever for rotating the head is connected to the head provided on the fastener.

[0010] In the doctor device having the above structure,
The doctor blade can be configured to be directly held by the doctor holder and the holder lid without using the conventionally used patch plate. At this time, it is preferable to set the length of the protruding end of the doctor blade from the holder lid to 5 to 15 mm.

Further, a reference surface is provided on the doctor holder at a right angle to the support surface behind the support surface for supporting the doctor blade, and the rear end of the holder lid is directly or spacer-mounted on the reference surface. It is preferable that the pressing mechanism is configured to press the pressing force.

The doctor holder is provided with a position fixing reference pin for pressing and positioning the rear end of the doctor blade, and the holder lid is provided with the holder at a position opposed to the position fixing reference pin. It is preferable that a cleaning hole having a diameter larger than that of the position fixing reference pin is formed through the lid.

[0013]

In the doctor device having the above structure, when the fastener is loosened, the lid holder can rotate about the support shaft of the fastener, so that the lid holder is rotated to separate from the upper surface of the holder lid. By moving the holder lid and the doctor blade to the doctor holder, the holder lid and doctor blade can be easily removed from the doctor holder or placed on the doctor holder.
After placing the doctor blade and the holder lid on the doctor holder, the lid holder is moved onto the holder lid, and the fastener is tightened, whereby the holder lid and the doctor blade can be fixed to the doctor holder.

If the operating lever is connected to the head provided on the fastener as described above, the operating lever can be moved to tighten or loosen the fastener. Operation becomes easy.

Further, if the doctor blade is directly held by the doctor holder and the holder lid, the conventional contact plate can be omitted, the number of parts can be reduced, and the ink entry path can be reduced. At this time, by setting the protruding length of the tip of the doctor blade from the holder lid to 5 to 15 mm, the cushioning property required for the doctor blade is secured, and the tip of the doctor blade is moved to the cylinder for scraping the ink. Contact can be made evenly. The protruding length of the doctor blade tip from the holder lid is 5
Although it is set within the range of １５15 mm, strictly, it is appropriately determined according to the thickness of the doctor blade and the contact pressure with the cylinder, and is usually preferably about 8 to 10 mm.

Further, if a reference surface is provided at right angles to the support surface behind the support surface for supporting the doctor blade of the doctor holder, the rear end of the holder lid is directly or via a spacer on the reference surface. By pressing, the distal end position of the holder lid can be positioned, and therefore, the length of projection of the doctor blade from the distal end of the holder lid can be easily set to a predetermined length. Also, by changing the thickness of the spacer used, the protruding length of the doctor blade can be adjusted.

Further, a cleaning hole having a diameter larger than that of the position fixing reference pin is formed through the holder lid at a position of the holder lid opposite to the position fixing reference pin provided on the doctor holder. If this is done, the cleaning liquid can be poured through the cleaning hole to clean the periphery of the position fixing reference pin, thereby preventing the ink attached to the position fixing reference pin from lowering the position accuracy of the doctor blade.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic sectional view of a doctor device according to a preferred embodiment of the present invention, FIG. 2 is a schematic plan view of the doctor device, and FIG. 3 is a schematic plan view showing a state where a holder lid is removed from the doctor device. 1 to 3, reference numeral 10 denotes an entire doctor device, 11 denotes a doctor blade, 1
Reference numeral 2 denotes a doctor holder for supporting the doctor blade 11. As can be clearly seen from FIG. 1, the doctor holder 12 has a shape in which the upper surface of about a half part on the front end side is cut away, and a support surface 12a that supports one side of the doctor blade 11 on the part, A groove 12b on the rear side,
A reference surface 12c perpendicular to the support surface 12a is formed. The doctor holder 12 is made of aluminum to reduce the weight.

Reference numeral 14 denotes a support surface 1 of the doctor holder 12.
A plurality of position fixing reference pins attached to 2a are provided at appropriate intervals in the longitudinal direction of the doctor holder 12. The position fixing reference pin 14 is for positioning the doctor blade 11 by pressing the rear end of the doctor blade 11, and in this embodiment, a pin having a relatively large diameter (for example, 5 mm) to prevent breakage or the like. Degree) are used. Reference numeral 16 denotes a holder lid that is attached to the doctor holder 12 via the doctor blade 11, a support surface 16 a that supports a surface on the opposite side of the doctor blade 11, a projection 16 b formed on the lower surface of the rear end,
It has a rear end surface 16c perpendicular to the support surface 16a. The projection 16b is formed at a position where the doctor lid 16 is inserted into the groove 12b of the doctor holder 12 when the doctor lid 16 is attached to the doctor holder 12, so that the doctor lid 16 does not slide down inadvertently. It is provided. Further, the doctor lid 16 is provided with a position fixing reference pin 14 attached to the doctor holder 12.
Is formed through a cleaning hole 17 having a diameter larger than that of the position fixing reference pin 14.

Reference numeral 18 denotes the reference surface 1 of the doctor holder 12.
This is a spacer inserted between the rear end face 2c and the rear end face 16c of the holder lid 16. When attaching the holder lid 16 to the doctor holder 12, the rear end of the holder lid 16 is pressed against the reference surface 12c via the spacer 18, so that the tip of the holder lid 16 has a thickness corresponding to the thickness of the spacer 18. It will be the position according to. Therefore, by exchanging the spacer 18 with one having a different thickness, or by omitting the spacer 18 and directly pressing the rear end of the holder lid 16 against the reference surface 12c, the tip position of the holder lid 16 is adjusted. , it is possible to change the projection length L ₂ of the doctor blade 11 from the tip. The holder lid 16 is also made of aluminum to reduce the weight.

Reference numeral 20 denotes a supporting surface 12a of the doctor holder 12 at a plurality of positions spaced apart in the longitudinal direction.
A plurality of lid holders 22 provided so as to press the lid holder 22 is a fastener for fastening the lid holder 20. The fastening tool 22 is attached to the doctor holder 12 at a position rearward of the rear end of the holder lid 16 attached to the doctor holder 12, and includes a support shaft 22 a screwed to the doctor holder 12 and an upper end thereof. And a control lever 22c connected to the head 22b. The lid holder 20 is rotatably held by the support shaft 22a, and is moved from the operating position on the holder lid 16 shown in FIG.
Can be rotated to an open position separated from the holder lid 16 shown in FIG. The fastening tool 22 can tighten the lid holder 20 with the head 22b by rotating the support shaft 22a clockwise and screwing in, and can fix the holder lid 16 located thereunder. By rotating the support shaft 22a in the opposite direction, the head 22b can be raised and the lid holder 20 can be loosened. The structure of the fastener 22 for tightening and loosening the lid holder 20 is not limited to the structure in which the support shaft 22a and the head 22b are integrated as shown in FIG. Can be changed to an arbitrary configuration that can tighten and loosen the lid holder 20. For example, the head is screw-engaged with a spindle, the spindle is fixed to the doctor holder 12, and the A configuration in which the lid holder 20 can be tightened and loosened by rotating the head with respect to the shaft may be used.

As described above, the lid holder 20 is moved from the operating position where the holder lid 16 shown in FIG.
Can be rotated to the open position disengaged from the holder lid 16 shown in FIG. 1, but stopper pins 24 and 25 are provided on the upper surfaces of the holder lid 16 and the doctor holder 12 to prevent further rotation.

The interval between the lid holders 20 provided on the doctor holder 12 is preferably shorter in order to fix the doctor blade 11.
As the number of 0s increases, workability deteriorates and costs increase. In consideration of these, in this embodiment, the lid holder 2
The distance between the bolts 7 provided in the conventional doctor device is zero.
Is selected to be about three times as large as the interval of, that is, about 350 mm.

As can be clearly understood from FIG. 1, the doctor device 10 of this embodiment has the doctor blade 11 directly fixed by the doctor holder 12 and the holder lid 16, and the conventionally used contact plates 2, 3 (FIG. 7). Not used). In other words, the doctor holder 12 and the holder lid 16
Play the role of the conventional backing plates 2 and 3. For this reason, the distal end of the doctor holder 12 extends longer than before, and the doctor holder 12 and the holder lid 1 are extended.
The protruding length of the doctor blade 11 from 6 is set shorter than the protruding length of the doctor blade 1 and the abutment plates 2 and 3 in the conventional doctor device. However, doctor blade 1
In order to give the necessary cushioning property to the doctor blade 1, the protruding length L ₂ of the doctor blade 11 from the tip of the doctor lid 16 is longer than the protruding length L ₁ of the doctor blade 1 from the tip of the backing plate 2 in the conventional device. Set long, usually 5-15mm
About, preferably about 8 to 10 mm. The length of the doctor blade 11 protruding from the doctor holder 12 and the holder lid 16 is shorter than that of the conventional doctor device, so that the length of the doctor blade 11 itself (the length of the cross section shown in FIG. 1) is reduced. It is possible to make the length shorter than that of a conventional doctor blade. In this embodiment, the length is set to 50 mm (the conventional doctor blade 1 is 60 mm), and the cost is reduced.

Next, a method of using the doctor device 10 having the above configuration will be described. First, to replace the doctor blade 11 of the doctor device 10 assembled in the state shown in FIG.
By operating the operation lever 22c of the fastener 22 to rotate the support shaft 22a by an appropriate angle to loosen it,
0 is turned to the open position shown in FIG. In this state, the holder lid 16 and the doctor blade 11 are removed, a new doctor blade 11 is set at a predetermined position on the doctor holder 12, and the holder lid 16 is placed thereon. Thereafter, the lid holder 20 is returned to the operating position shown in FIG. 2, and the support shaft 22a is tightened by the operation lever 22c, so that the holder lid 1
Tighten 6. This completes the doctor blade replacement operation. As described above, in the present embodiment, the fixing and releasing of the holder lid 16 can be performed simply by the tightening and loosening operation of the fastener 22 and the rotating operation of the lid holder 20. The operation is extremely easy as compared with the case where complete detachment is required, and replacement in a short time is possible. In addition, the fastener 22 and the lid holder 2
Since 0 is not removed, these parts will not be lost.

Next, this doctor device 10 is used by being attached to a printing unit, similarly to a conventional doctor device. That is, as shown in FIG. 5, the doctor device 10 is attached to a doctor holding device (not shown) provided near the cylinder 30 in the printing unit.
A rotational force in the direction of arrow A is applied, and the tip of the doctor blade 11 is pressed against the cylinder 30 to scrape off excess ink on the cylinder surface. Here, as described above, in the doctor device 10 of the present embodiment, the interval between the lid holders 20 for fixing the holder lid 16 to the doctor holder 12 is widened, and as a result, as shown in FIG. To
The doctor blade 11 tends to be wavyly deformed at a portion fixed by the lid retainer 20 and at an intermediate portion thereof. However, the protruding length L2 of the doctor blade 11 is ₅ to 15 m.
m, and a moderate cushioning property is given to the portion, so that when the tip of the doctor blade 11 is pressed against the surface of the cylinder 30, the wavy deformation is corrected by the cushioning property of the tip of the doctor blade 11, and the cutting edge is reduced. It evenly contacts the surface of the cylinder 30. Thus, good ink scraping can be performed.

In FIG. 1, during use of the doctor device 10, the ink may enter between the doctor blade 11 and the doctor holder 12 or between the holder lid 16 and the inside. However, compared with the conventional doctor device, since a backing plate is not used, there are few ink entry paths and ink entry is not so large. In addition, the penetrated ink may adhere to the position fixing reference pin 14. When the doctor device 10 is immersed in the cleaning liquid for cleaning, the cleaning liquid enters the periphery of the position fixing reference pin 14 from the cleaning hole 17 and the The ink attached to the part can be washed away. Thus, there is no possibility that a large amount of ink adheres to the position fixing reference pin 14 and lowers the position accuracy of the doctor blade 11.

The doctor device 10 having the structure shown in the above embodiment.
According to the operation test, the doctor blade 11
It has been found that the durability of the steel is greatly improved. That is,
The conventional doctor device shown in FIG.
15 mm, length 60 mm), the replacement of the doctor blade was required for printing 1 million copies, but in this embodiment (doctor blade thickness 0.15 mm, length 50 mm), the protruding length of the doctor blade tip the L ₂ when the 8mm is 265 million copies, the projection length L ₂ of the doctor blade tip when the 10 mm, are possible printing 248 thousand copies, life had become about 2.5 times. This is probably because the blade itself has good cushioning properties.

In the above embodiment, the doctor blade 11 is fixed to the doctor holder 12 and the holder lid 16 without using a backing plate. However, the present invention is not limited to this configuration, and is similar to the conventional one. The present invention is also applicable to the case where a backing plate is used.

[0030]

As described above, the present invention has a structure in which a holder lid for fixing a doctor blade is fixed by a plurality of lid holders provided rotatably and a fastener for tightening the lid. Therefore, loosen the fasteners and rotate the lid holder to move it out of the upper surface of the holder lid, so that the holder lid and the doctor blade can be easily removed from the doctor holder or placed on the doctor holder. Also, by moving the lid holder onto the holder lid and tightening the fastener, the holder lid and the doctor blade can be fixed to the doctor holder, making the replacement of the doctor blade extremely easy and easy. This has the effect that it can be performed in a short time. Also, since the number of lid holders and fasteners can be reduced as compared with the case where a large number of bolts and nuts are used as in the conventional case, the tightening accuracy can be improved, and the lid holders and fasteners are not removed. There is also an effect that loss of parts can be prevented.

If the operating lever is connected to the head provided on the fastener as described above, the operating lever can be moved to tighten or loosen the fastener. The effect is that it becomes easy.

When the doctor blade is directly held by the doctor holder and the holder lid, and the projecting length of the distal end of the doctor blade is set to 5 to 15 mm, reliable contact of the doctor blade with the cylinder is ensured. On the other hand, it is possible to obtain the effect that the conventional contact plate can be omitted, the number of parts can be reduced, and the number of ink entry paths can be reduced. Further, the effect that the life of the doctor blade can be extended can be obtained.

Further, if a reference surface is provided at right angles to the support surface behind the support surface for supporting the doctor blade of the doctor holder, the rear end of the holder lid is directly or via a spacer on the reference surface. By pressing, the position of the tip of the holder lid can be positioned, so that the protruding length of the doctor blade from the tip of the holder lid can be easily set to a predetermined length, and by changing the thickness of the spacer used, The effect is obtained that the length of projection of the doctor blade can be easily adjusted.

Further, when a cleaning hole is formed through the holder lid at a position opposite to the position fixing reference pin provided on the doctor holder, the cleaning liquid is supplied from the cleaning hole. In addition, the periphery of the position fixing reference pin can be cleaned, and the effect of preventing a decrease in the position accuracy of the doctor blade due to ink attached to the position fixing reference pin can be obtained.

[Brief description of the drawings]

1 shows a doctor device according to a preferred embodiment of the invention,
FIG. 2 is a schematic cross-sectional view as viewed in the direction XX

FIG. 2 is a schematic plan view of the doctor device.

FIG. 3 is a schematic plan view showing a state in which a holder lid is removed from the doctor device.

FIG. 4 is a schematic front view showing exaggerated deformation of a doctor blade in the doctor device.

FIG. 5 is a schematic side view showing a state where the doctor device is pressed against a cylinder of a printing unit.

FIG. 6 is a schematic plan view of a conventional doctor device.

FIG. 7 is a schematic sectional view of the doctor device of FIG. 6 as viewed in the direction of arrows YY.

[Explanation of symbols]

 Reference Signs List 10 Doctor device 11 Doctor blade 12 Doctor holder 12a Support surface 12c Reference surface 14 Position fixing reference pin 16 Holder lid 16a Support surface 16c Rear end surface 17 Cleaning hole 18 Spacer 20 Lid holder 22 Fastener 22a Support shaft 22b Head 22c Operation lever

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenichi Oshiki 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. 62-22827 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 9/00-9/08

Claims (5)

(57) [Claims] 1. A doctor blade having a doctor blade, a doctor holder having a support surface for supporting one side of the doctor blade, and mounted on the doctor holder via the doctor blade to support a surface on the opposite side of the doctor blade. A holder lid having a support surface, a plurality of lid holders provided to press the holder lid toward the support surface of the doctor holder at a plurality of locations separated in a longitudinal direction, and attached to the doctor holder. A fastener attached to the doctor holder at a position rearward of the rear end of the holder lid, and a fastener for tightening and fixing the lid retainer, wherein the fastener is attached to the doctor holder and rotates the lid retainer. A support shaft movably held, and provided on the support shaft so as to be able to come into contact with the upper surface of the lid retainer; A head for tightening and loosening the lid holder. 2. The fastening tool according to claim 1, further comprising an operation lever connected to the head.
The doctor device as described. 3. The doctor blade is directly held by the doctor holder and a holder lid, and a protruding length of the distal end of the doctor blade from the holder lid is 5-1.
The doctor device according to claim 1, wherein the doctor device is set to 5 mm. 4. The doctor holder has a reference surface provided at right angles to the support surface behind a support surface for supporting a doctor blade, and the rear end of the holder lid is directly or directly connected to the reference surface. 4. The method according to claim 1, wherein the pressing is performed via a spacer.
A doctor device according to the item. 5. The doctor holder has a position fixing reference pin for pressing and positioning a rear end of the doctor blade, and the holder lid is provided at a position facing the position fixing reference pin. The cleaning hole having a diameter larger than that of the position fixing reference pin is formed through the lid.
A doctor device according to the item.