JP3029722B2 - Doctor blade sharpening 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 blade polishing apparatus for polishing a doctor blade used in a gravure rotary press, a coater or the like.

[0002]

2. Description of the Related Art In a gravure rotary press, as shown in FIG. 6, a doctor 1 plays a role of scraping off unnecessary ink on the plate surface while making contact with a rotating plate 2. However, as shown in FIG. Wear as shown. That is, as shown in (a), in the cross-sectional shape, abrasion proceeds at an acute angle according to the contact angle of the tip with the plate. As shown in (b), in the width direction shape, only the portion in contact with the picture portion of the plate is significantly worn, so that the tip loses parallel accuracy.

When the doctor wears as shown in FIGS. 7 (a) and 7 (b), the function of scraping the ink on the surface of the printing plate deteriorates, and unnecessary ink is transferred to the printed matter, resulting in a product value of the printed matter. Impair. Such wear problems also occur in coaters.

Conventionally, the following measures have been taken when the doctor blade wears. Replace with a new doctor and discard worn doctor. Rehabilitation polishing is performed manually only on the uneven wear part of the doctor blade. That is, as shown in FIG. 5A, the hatched portion 3 of the blade of the doctor 1 is removed by hand polishing using a square grindstone. The worn doctor blade is regenerated and polished by a doctor regenerating polishing device having a rotating grindstone. That is, as shown in FIG. 5 (b), the hatched portion 4 of the blade of the doctor 1 is
Polish and remove with a rotating grindstone. Examples of the doctor regeneration polishing apparatus are disclosed in, for example, Japanese Utility Model Publication No. Sho 54-17586 and Japanese Utility Model Publication No. Sho 59-9808.

[0005]

SUMMARY OF THE INVENTION Among the above measures,
Both methods are effective methods for regenerating doctors. However, since these methods involve manual polishing, there is a problem that the work load on the operator is large. In addition, the method using the doctor regeneration polishing apparatus requires an expensive polishing apparatus using a rotary grindstone, and has a problem that equipment costs are high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a doctor blade polishing apparatus capable of polishing a doctor blade with a relatively simple apparatus.

[0007]

SUMMARY OF THE INVENTION A doctor blade polishing apparatus according to the present invention comprises: a fixed support for fixing and supporting a doctor holder on which a doctor to be polished is assembled; and a doctor blade of the doctor holder held by the fixed support. A grindstone assembly disposed in parallel with the doctor blade at a position facing the first, a first grindstone having a grindstone surface perpendicular to the doctor and a second grindstone surface disposed on both sides thereof and inclined with respect to the doctor. A whetstone assembly having second and third whetstones; an actuator for reciprocating the whetstone assembly in parallel with the doctor holder; and moving the whetstone assembly toward the doctor blade to push the first whetstone against the doctor blade. A first pressurizing device to be attached, and moving the grinding wheel assembly in a direction perpendicular to the doctor to remove the second or third grinding wheel. And having a second pressure device for pressing the coater blade.

[0008]

In the doctor blade polishing apparatus having the above structure, when the doctor holder having the doctor to be polished is attached to the fixed support, the doctor blade is located at a position facing the grindstone assembly. In this state, the first pressurizing device is operated, the first grindstone of the grindstone assembly is pressed against the doctor blade, and the actuator is operated to reciprocate the grindstone assembly along the doctor. It is possible to travel while grinding, and to grind the doctor blade edge so that it becomes a plane perpendicular to the doctor. Further, when the second pressurizing device is operated, the grindstone assembly can be pushed in the lateral direction, and the second or third grindstone inclined with respect to the doctor can be pressed against the doctor blade, and in that state, the actuator is operated. By reciprocating the grindstone assembly along the doctor, the doctor blade can be polished in a direction inclined with respect to the doctor.

[0009]

FIG. 1 is a schematic sectional view showing a doctor blade polishing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic side view of a main part of the doctor blade polishing apparatus. Is a doctor holder to which the doctor 1 is assembled.

[0010] 11 is a frame of the doctor blade sharpening device,
Reference numeral 12 denotes a fixing support for fixing the doctor holder 6 such that the doctor 1 is positioned in a vertical plane and the blade of the doctor is upward and horizontal. The fixing support 12 includes a recess 12a for supporting the doctor holder 6 and the doctor holder 6. It has a clamp lever 12b for fixing. Reference numeral 13 denotes a grindstone assembly arranged at a position facing the doctor blade of the doctor holder 6 held by the fixed support member 12 in parallel with the doctor blade. This whetstone assembly 13
As shown in FIGS. 3A and 3B, a first grinding wheel 14 having a grinding wheel surface 14a perpendicular (and thus horizontal) to the doctor 1 and grinding wheel surfaces disposed on both sides thereof and inclined with respect to the doctor 1 A second grindstone 15 and a third grindstone 16 having 15a and 16a are provided. The second whetstone 15 and the third whetstone 1
Numeral 6 is for polishing the edges on both sides of the blade edge of the doctor 1, and its inclination angle is usually set to about 30 to 60 degrees. In the embodiment shown in the drawings, the inclination angles of the left and right second and third grindstones 15 and 16 with respect to the doctor are made different.

In FIGS. 1 and 2, reference numeral 18 denotes an actuator for reciprocating the grindstone assembly 13 in parallel with the doctor holder 6. In this embodiment, the actuator 18 is parallel above the doctor holder 6 fixed at a predetermined position. And a slider 20 that travels along the slide cylinder 19 (in the direction of arrow AA in FIG. 2). 2
2 is a first carrier fixed to the slider 20, 23
Is a second carrier held movably with respect to the first carrier 22 via a linear bearing 24. The linear bearing 24 is arranged in a direction perpendicular to the direction of movement of the first carrier 22, so that the second carrier 23 is perpendicular to the doctor 1 fixed at a predetermined position (arrow BB in FIG. 1). Direction).

Reference numeral 26 denotes a small-stroke air cylinder vertically mounted on the second carrier 23, and the grinding wheel assembly 13 is held at the tip of a piston rod. With this configuration, the grinding wheel assembly 13 can reciprocate up and down. Here, as shown in FIG. 3A, when the piston rod is extended, the mounting position and the stroke of the air cylinder 26 can move the grindstone assembly 13 downward and press it against the cutting edge of the doctor 1.
Further, when the piston rod is retracted, the second grindstone 15 or the third grindstone 16 of the grindstone assembly 13 is set to have the same height as the cutting edge of the doctor 1 as shown in FIG. The air cylinder 26 constitutes a first pressure device for moving the grindstone assembly toward the doctor blade and pressing the first grindstone against the doctor blade.

In FIG. 2, 28 is a torque actuator attached to the first carrier 22, 29 is a pinion gear driven to rotate by the torque actuator 28,
Reference numeral 30 denotes a rack attached to the second carrier 23 so as to mesh with the pinion gear 29. This rack 3
0 is arranged parallel to the linear bearing 24, and therefore in the direction of the arrow BB in FIG. Therefore, by rotating the pinion gear 29 by the torque actuator 28, the second carrier 23 and the grindstone assembly 13 held thereon can be reciprocated in a direction perpendicular to the doctor blade edge, as shown in FIG. As shown, the second carrier 23 is moved to the left (in the direction of arrow B) to press the second grindstone 15 against the cutting edge of the doctor 1, and is moved in the opposite direction to press the third grindstone 16 against the cutting edge of the doctor 1. be able to. The torque actuator 28, the pinion gear 29, the rack 30, and the like constitute a second pressure device for moving the grindstone assembly in a direction perpendicular to the doctor and pressing the second or third grindstone against the doctor blade.

In FIG. 1, reference numeral 32 denotes an actuator 18
Moving frame 33 holding the slide cylinder 19 of
Are the turning brackets holding the moving frame 32, 3
Reference numeral 4 denotes a rotating shaft holding the turning bracket 33, and reference numeral 35 denotes a bearing holding the rotating shaft 34 rotatably. With this configuration, the turning bracket 33, the moving frame 32, the actuator 18 held thereon, the grindstone assembly 13 and the like can be moved as a whole from the operating position indicated by the solid line to the retracted position indicated by the two-dot chain line. Although not shown, means for fixing the turning bracket 33 to the operating position shown by the solid line is provided.

Reference numeral 37 denotes a taper guide disposed along a position where the grinding wheel assembly 13 reciprocates. This taper guide 37 has a guide surface 37a slightly inclined with respect to the doctor 1, as shown in FIG. Numeral 38 denotes a guide device for guiding the guide 37 so as to be movable in the direction of the arrow C-C. Numeral 39 denotes an operating position of the guide 37 indicated by a solid line, and a retracted position (indicated by a two-dot chain line) in FIG. (Position indicated by).
41 is a support plate fixed to the grinding wheel assembly 13, 42 is held by the support plate 41, and a guide surface 37 of a guide 37
This is a cam follower that comes into contact with a.

Although not shown, the actuator 18, air cylinder 26, torque actuator 2
8. A control device for controlling the air cylinder 39 and the like according to a desired sequence is provided.

Next, the operation of the doctor blade polishing apparatus having the above configuration will be described. In FIG. 1, the doctor holder 6 with the doctor 1 assembled is set in the recess 12a while the grindstone assembly 13 and the member holding the same are kept at the position shown by the two-dot chain line in FIG. Fix with. Next, the turning bracket 33 is turned to move the grindstone assembly 13 and the members holding the same to the operating position indicated by the solid line. At this time, the air cylinder 26 that moves the grindstone assembly 13 up and down is in a retracted state, and the first grindstone 14 of the grindstone assembly 13 is slightly separated from the blade of the doctor 1. Further, the taper guide 37 is also at a position retracted leftward.

In this state, the polishing operation is started by pressing the start button of the control device. First, the air cylinder 26 operates to lower the grindstone assembly 13 and press the first grindstone 14 against the cutting edge of the doctor 1 as shown in FIG. At the same time, as shown in FIG. 1, the air cylinder 39 operates to advance the taper guide 37 to the operating position shown by the solid line, and the torque actuator 28 operates to urge the second carrier 23 to the left in FIG. I do. Thereby, the cam follower 42 attached to the grindstone assembly 13 is pressed against the guide surface 37 a of the taper guide 37. Next, the actuator 18 operates to reciprocate the grindstone assembly 13. Thereby, the first whetstone 1
4 travels in vertical pressure contact with the blade edge of the doctor 1, and grinds the doctor blade edge surface so as to be perpendicular to the doctor 1. When the grindstone assembly 13 reciprocates, the grindstone assembly 13 also slightly moves in the lateral direction (the direction of the arrow BB) according to the guide surface 37a of the taper guide 37. The position of the grinding wheel surface 14a in contact with the doctor blade moves little by little in the lateral direction,
A wide range of the grinding wheel surface 14a is effectively used for polishing.

After performing the above polishing operation for a set time,
The air cylinder 26 operates to raise the grinding wheel assembly 13, and the air cylinder 39 operates to operate the taper guide 3.
7 is retracted. In addition, the torque actuator 28 operates to move the second carrier 23 to the left in FIG.
Thereby, the grindstone surface 15a of the inclined second grindstone 15 is pressed against the edge of the cutting edge of the doctor 1, as shown in FIG. In this state, the actuator 18 is operated to reciprocate the grindstone assembly 13, and the right edge of the blade of the doctor 1 is polished by the second grindstone 15.

After this polishing has been performed for a set time, the torque actuator 28 rotates in the opposite direction to move the second carrier 23 in the opposite direction, and the third grinding wheel 16 of the grinding wheel assembly 13 Press against the left edge. Thereafter, the actuator 18 is operated to reciprocate the grindstone assembly 13, and the left edge of the blade of the doctor 1 is polished by the third grindstone 16.

After the polishing is performed for a set time, the polishing is terminated. As a result, the cutting edge of the doctor 1 is polished at right angles to the doctor's face, and the edges on both sides thereof are polished obliquely.

In the above-described polishing operation, the amount of polishing is controlled by the set time of each polishing operation by the first grinding stone 14, the second grinding stone 15, and the third grinding stone 16. It may be controlled by the number of reciprocations of the actuator 18 to be moved. In the above-described polishing operation, the case where all of the first grindstone 14, the second grindstone 15, and the third grindstone 16 are used has been described.
It is not always necessary to use all 15 and 16, and polishing using only one or two of them may be performed. For example, using only the first grindstone 14 to grind the doctor blade at right angles to the doctor, or using the second grindstone 15
The doctor blade may be polished obliquely using only the blade.

In the above embodiment, when the doctor holder 6 is set, the grindstone assembly 13 and the actuator 18 for reciprocating the grindstone assembly 13 are turned around the rotating shaft 34 and retracted to the position shown by the two-dot chain line in FIG. However, the present invention is not limited to this configuration, and a configuration in which the grindstone assembly 13, the actuator 18, and the like are retracted upward may be employed. The means for moving the grindstone assembly 13 and the actuator 18 between the operating position and the retracted position is not limited to manual operation, but may be automatically performed using a suitable driving device (torque actuator, air cylinder, etc.). You may.

[0024]

As described above, according to the present invention, the grinding wheel assembly can be reciprocated by pressing against the doctor blade, and the doctor blade can be polished. At that time, the grindstone assembly has a first grindstone having a grindstone surface perpendicular to the doctor, a second grindstone disposed on both sides of the grindstone surface, and a third grindstone. It is possible to polish a plane perpendicular to the doctor or to a state inclined. Furthermore, since a rotating grindstone is not used, there are advantages that the apparatus is not complicated and that it can be manufactured relatively inexpensively.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a doctor blade polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a main part of the embodiment.

FIGS. 3 (a) and 3 (b) are schematic cross-sectional views of main parts showing a state in which a doctor blade is polished in the above embodiment.

FIG. 4 is a schematic plan view showing a grindstone assembly, a doctor holder, a taper guide, and the like in the above embodiment.

FIG. 5 (a) is a schematic side view showing an example of polishing of a doctor blade tip, and FIG. 5 (b) is a schematic side view showing another example of polishing of a doctor blade tip.

FIG. 6 is a schematic side view illustrating a use state of a doctor.

FIG. 7A is a schematic side view showing a worn blade of a doctor. FIG. 7B is a schematic perspective view of the doctor blade.

[Explanation of symbols]

 Reference Signs List 1 doctor 6 doctor holder 11 frame 12 fixed support 13 grindstone assembly 14 first grindstone 15 second grindstone 16 third grindstone 18 actuator 19 slide cylinder 20 slider 22 first carrier 23 second carrier 24 linear bearing 26 air cylinder 28 torque actuator 29 pinion gear 30 rack

Claims (1)

(57) [Claims] A fixed support for fixing and supporting a doctor holder to which a doctor to be polished is attached, and a doctor holder of the doctor holder held by the fixed support, which is disposed parallel to the doctor blade at a position facing the doctor blade. A grinding wheel assembly, comprising a first grinding wheel having a grinding wheel surface perpendicular to the doctor and second and third grinding wheels having grinding wheel surfaces disposed on both sides thereof and inclined with respect to the doctor, An actuator for reciprocating the grindstone assembly in parallel with the doctor holder, a first pressing device for moving the grindstone assembly toward a doctor blade and pressing a first grindstone against the doctor blade, And a second pressing device for moving the second or third grindstone against the doctor blade by moving in a direction perpendicular to the -Blade edge polishing equipment.