WO2014109261A1

WO2014109261A1 - Burr cutter and gravure engraving device provided with burr cutter

Info

Publication number: WO2014109261A1
Application number: PCT/JP2013/085154
Authority: WO
Inventors: 山崎　進; 山崎　裕司; 武中山
Original assignee: 株式会社シンテック
Priority date: 2013-01-09
Filing date: 2013-12-27
Publication date: 2014-07-17
Also published as: EP2944467A4; EP2944467A1; JP2014133326A; JP5848715B2; EP2944467B1

Abstract

The purpose of the present invention is to provide a burr cutter capable of favorably removing burrs without marring the surface of the gravure cylinder. Provided is a burr cutter (4) equipped with a main body (4a), which is secured to an engraving mechanism with an engraving stylus for engraving the surface of a cylindrical gravure cylinder (5), and a cutter section (4d), which is secured to the main body (4a) and is for removing burrs generated as a result of the engraving by the engraving mechanism. The surface of the cutter section (4d) that faces the surface of the gravure cylinder (5) is substantially flat.

Description

Gravure engraving equipment with bar cutter and bar cutter

The present invention relates to a bar cutter and a gravure engraving apparatus provided with the bar cutter.

Conventionally, a gravure engraving apparatus that engraves the surface of a cylindrical gravure cylinder to form a cell is known. The gravure engraving apparatus changes the volume of a concave depression called a cell formed on the surface of the gravure cylinder by changing the vibration amount of the engraving needle. When performing gravure printing, the gravure cylinder is filled with an amount of ink corresponding to the volume of the cell, and the shade corresponding to the amount of ink is reproduced on the printing medium.

On the surface of the gravure cylinder engraved with the engraving needle, the return of the copper piece on the surface of the cylinder (burr, bar) may remain around the cell scraped with the engraving needle. In order to remove this burr, a device is known in which a cutter part is brought into contact with the surface of the gravure cylinder (for example, see Patent Document 1).

As shown in FIG. 13 of Patent Document 1, the cutter unit in the apparatus disclosed in Patent Document 1 has a substantially semi-cylindrical shape having a curvature in the rotation direction of the gravure cylinder. Moreover, the cutter part of patent document 1 can be rock | fluctuated centering | focusing on a rocking | fluctuation axis | shaft. When engraving with the gravure engraving apparatus, the cutter unit swings around the swing axis in accordance with the circumferential length of the gravure cylinder, and the cylindrical portion of the cutter unit contacts the surface of the gravure cylinder.

JP 2004-34568 A

However, the cutter portion of Patent Document 1 has a substantially semi-cylindrical shape having a curvature in the rotation direction of the gravure cylinder. Therefore, the gap between the surface of the cutter part and the surface of the gravure cylinder gradually increases due to the curvature of the cutter part from the position where the cutter part and the gravure cylinder contact to the upstream side in the rotation direction of the gravure cylinder. ing. Therefore, burrs easily enter the gap at the upstream end of the cutter portion in the rotational direction of the gravure cylinder. When the burr enters the gap, the burr is pressed against the gravure cylinder at the contact position between the cutter portion and the gravure cylinder, and the surface of the gravure cylinder is damaged. If the surface of the gravure cylinder is damaged, it cannot be used for printing, and it is necessary to engrave a new gravure cylinder again.

In addition, since the cutter portion of Patent Document 1 has a substantially semi-cylindrical shape, the contact area between the cutter portion and the surface of the gravure cylinder is small, and burrs around the cell may not be sufficiently removed. If the burrs are not sufficiently removed, the volume of the cell becomes smaller than the desired volume, and the amount of ink filled in the cell when printing is reduced.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a bar cutter capable of satisfactorily removing burrs without damaging the surface of the gravure cylinder and a gravure engraving apparatus including the bar cutter. It is said.

In order to achieve the above object, the present invention provides the following means.
A bar cutter according to the present invention includes a main body part fixed to an engraving mechanism for engraving a surface of a cylindrical gravure cylinder, a cutter part fixed to the main body part and removing burrs generated by engraving by the engraving mechanism, And the opposed surface of the cutter portion that faces the surface of the gravure cylinder has a substantially planar shape.

According to the bar cutter of the present invention, the facing surface facing the surface of the gravure cylinder of the cutter part for removing burrs has a substantially planar shape. For this reason, burrs are unlikely to enter the gap between the surface of the cutter portion and the surface of the gravure cylinder, and scratches on the surface of the gravure cylinder due to the burrs being pressed against the gravure cylinder are less likely to occur. Moreover, the contact area where a cutter part and a gravure cylinder contact is fully ensured, and the pressure which a cutter part presses a gravure cylinder is fully disperse | distributed.
Therefore, according to the bar cutter according to the present invention, it is possible to provide a bar cutter capable of satisfactorily removing burrs without damaging the surface of the gravure cylinder.

Further, the bar cutter according to the first aspect of the present invention is capable of swinging about a swing shaft fixed to the main body portion, with the cutter portion fixed to one end, substantially parallel to the rotation axis of the gravure cylinder. An arm portion; and a contact angle adjusting portion that adjusts a contact angle of the facing surface with respect to a surface of the gravure cylinder by swinging the arm portion.

According to the bar cutter of the first aspect of the present invention, when a gravure cylinder having a different circumferential length is mounted, the arm portion is swung to adjust the contact angle of the opposed surface of the cutter portion to the surface of the gravure cylinder. Thus, the contact angle suitable for the gravure cylinder can be obtained.
By doing so, it is possible to provide a bar cutter that can remove burrs well without damaging the surface of the gravure cylinder, regardless of the circumferential length of the gravure cylinder engraved by the gravure engraving apparatus.

The bar cutter according to the first aspect of the present invention may be configured such that the contact angle adjustment unit receives an adjustment operation by an operator and adjusts the contact angle according to the adjustment operation.
In this way, when gravure cylinders having different circumferential lengths are mounted, the contact angle of the opposed surface of the cutter unit to the surface of the gravure cylinder is adjusted according to the adjustment operation by the operator, and is suitable for the gravure cylinder. It can be a contact angle.

In the bar cutter having the above-described configuration, the contact angle adjusting unit is configured to apply a biasing force in one direction of the swinging direction to the other end of the arm portion, and a direction facing the biasing force of the biasing member. And an abutting member that is abutted against the other end and changes in position with respect to the main body according to the adjustment operation.
By doing in this way, the position with respect to the main-body part of an abutting member changes according to an operator's adjustment operation, and an arm part rock | fluctuates with it. And the contact angle with respect to the surface of the gravure cylinder of the opposing surface of a cutter part with the rocking | fluctuation of an arm part is adjusted, and it can be set as the contact angle suitable for a gravure cylinder.

In the above, the abutting member is identified so that the operator can identify the male screw part fastened to the female screw part provided in the main body part and the fastening state of the male screw part with respect to the female screw part May be provided.
By doing in this way, an operator can adjust appropriately the contact angle with respect to the surface of the gravure cylinder of the opposing surface of a cutter part, recognizing the fastening state of the external thread part of an abutting member by an identification part. . For example, the operator stores the relationship between the circumferential length of the gravure cylinder and the fastening state of the external thread portion identified by the identification unit, thereby performing an appropriate adjustment operation according to the circumferential length of the gravure cylinder. It can be done easily.

In the bar cutter according to the first aspect of the present invention, the arm portion changes the angle of the facing surface with respect to the surface of the gravure cylinder around a turning axis that is orthogonal to the swing axis and substantially parallel to the facing surface. It may be configured to include a turning angle adjusting unit that can turn in a direction and adjusts the turning angle of the facing surface with respect to the surface of the gravure cylinder by turning the arm part.
By doing in this way, the bar cutter which can adjust the turning angle of the opposing surface of the cutter part with respect to the surface of a gravure cylinder appropriately, and can remove a burr satisfactorily can be provided.

The bar cutter according to the first aspect of the present invention may be configured such that the cutter part is detachably attached to the arm part.
By doing in this way, when exchanging a cutter part for re-polishing, the contact angle with respect to the surface of the gravure cylinder of the opposing surface of the cutter part before and behind exchange can be maintained. Therefore, the operation of adjusting the contact angle again with the replacement of the cutter portion is unnecessary or can be reduced.

A gravure engraving apparatus according to the present invention comprises an engraving mechanism for engraving a surface of a cylindrical gravure cylinder, a holding member for holding the engraving mechanism, and the aforementioned bar cutter fixed to the holding member. Features.
By doing in this way, a gravure engraving apparatus provided with the bar cutter which can remove a burr | flash favorably without damaging the surface of a gravure cylinder can be provided.

According to the present invention, it is possible to provide a bar cutter capable of satisfactorily removing burrs without damaging the surface of the gravure cylinder and a gravure engraving apparatus including the bar cutter.

It is a front view which shows the gravure engraving apparatus of one Embodiment of this invention. It is a front view which shows the bar cutter of one Embodiment of this invention. It is a top view of the bar cutter of FIG. 2, (a) shows the state which removed the upper plate, (b) shows the state which attached the upper plate. FIG. 3 is a cross-sectional view of the bar cutter of FIG. FIG. 3 is a cross-sectional view of the bar cutter of FIG. It is a right view which shows the gravure engraving apparatus of one Embodiment of this invention, (a) shows the case where the circumferential length of a gravure cylinder is long, (b) shows the case where the circumferential length of a gravure cylinder is short. It is a front view which shows the cutter part of other embodiment.

A bar cutter and a gravure engraving apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing a gravure engraving apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the gravure engraving apparatus 1 according to the present embodiment provides a gravure cylinder 5 with an engraving mechanism including an engraving head 2, a head bracket 3, a bar cutter 4, an engraving head 2, and a head bracket 3. A moving mechanism (not shown) that moves linearly in the direction of approaching or separating from each other is provided. Further, the gravure engraving apparatus 1 includes a rotation mechanism that holds both ends of a cylindrical gravure cylinder 5 and rotates the gravure cylinder 5 around a rotation axis.

The engraving head 2 includes a stylus 2a, a vibration shaft 2b serving as a central axis of vibration of the stylus 2a, a sliding shoe 2d, an engraving head main body 2e, an engraving head support 2f, and a suction duct 2g. A diamond engraving needle 2c is fixed to the tip of the stylus 2a. By causing the stylus 2a to vibrate by a vibration mechanism (not shown) with the vibration shaft 2b as a central axis, the engraving needle 2c vibrates in a direction in contact with or away from the gravure cylinder 5 rotated by the rotation mechanism.

The gravure cylinder 5 shown in FIGS. 4 and 5 to be described later is a cylindrical member having a surface plated with copper of about 50 μm to 200 μm. The gravure engraving apparatus 1 forms a concave depression called a cell on the surface of the gravure cylinder 5 by bringing the engraving needle 2c into contact with the rotating gravure cylinder 5 and cutting a part of the copper plating on the surface.

The gravure engraving apparatus 1 changes the volume of cells formed on the surface of the gravure cylinder 5 by changing the vibration amount of the engraving needle 2c. When performing gravure printing, the gravure cylinder 5 is filled with an amount of ink corresponding to the volume of the cell, and the shade corresponding to the amount of ink is reproduced on the printing medium.

The sliding shoe 2d is a member for keeping the distance between the engraving head main body 2e and the gravure cylinder 5 constant. Since the stylus 2a is fixed via the vibration shaft 2b, the distance between the stylus 2a and the gravure cylinder 5 is kept constant by the sliding shoe 2d. When engraving using the stylus 2a, the gravure engraving apparatus 1 starts rotation of the gravure cylinder 5 by a rotation mechanism (not shown) in a state where the engraving head main body 2e is separated from the gravure cylinder 5.

Thereafter, the gravure engraving apparatus 1 moves the engraving head main body 2e in a direction approaching the gravure cylinder 5 by a moving mechanism (not shown) while the gravure cylinder 5 is rotated. When the tip of the sliding shoe 2d comes into contact with the gravure cylinder 5 due to the movement by the movement mechanism, the gravure engraving apparatus 1 stops the movement of the engraving head main body 2e by the movement mechanism.

In this way, the gravure engraving apparatus 1 controls the moving mechanism so that the engraving needle 2c is arranged at a certain distance from the surface of the gravure cylinder 5. Thereafter, the vibration shaft 2b to which the stylus 2a is fixed is vibrated by a vibration mechanism, whereby engraving is performed with the engraving needle 2c, and cells are formed on the surface of the gravure cylinder 5.

The engraving head main body 2e is detachably supported with respect to the engraving head support 2f. Therefore, the stylus 2a can be replaced by removing the engraving head main body 2e from the engraving head support 2f.

The suction duct 2g sucks burrs scraped by the engraving needle 2c and burrs scraped by the bar cutter 4. The suction duct 2g is connected to a suction device (not shown) and sucks the air around the engraving needle 2c and the bar cutter 4 together with burrs.

Next, the bar cutter 4 of this embodiment will be described with reference to FIGS.
FIG. 2 is a front view showing the bar cutter 4 and shows a state in which a cutter portion 4d described later is removed. FIG. 3 is a top view of the bar cutter 4 shown in FIG. FIG. 3A shows a state in which an upper plate 4b described later is removed. FIG. 3B shows a state in which an upper plate 4b described later is attached.

As shown in FIG. 1, the bar cutter 4 is fastened by fastening

bolts

8 and 9 so that the upper surface thereof is in contact with the lower surface of the upper portion of the head bracket 3. As will be described later, the head bracket 3 is attached to the engraving head 2 so as to be swingable about a swing shaft 6. Accordingly, the bar cutter 4 fixed to the head bracket 3 can also swing around the swing shaft 6 with respect to the engraving head 2.

As shown in FIG. 2, the bar cutter 4 is fastened to the main body portion 4a, the upper plate 4b fastened to the upper surface of the main body portion 4a via a fastening screw, and the lower surface of the main body portion 4a via the fastening screw. A lower plate 4c.
Further, the bar cutter 4 includes a cutter portion 4d that is detachably fastened by a fastening screw to an arm portion 4g that swings around a swing shaft 4r described later.

The cutter unit 4d includes a pedestal 4f and a cylinder contact member 4e bonded to the pedestal 4f with an adhesive. The cutter part 4d is detachably attached to one end of the arm part 4g. The base 4f is provided with a semicircular cutout 4w. The cutter part 4d is positioned with respect to the arm part 4g by bringing the notch part 4w into contact with a convex part 4v having a circular shape in plan view provided at one end of the arm part 4g.

As shown in FIG. 2, the cylinder contact member 4e is a fan having a fan shape in plan view and a central angle of approximately 90 °. Moreover, the opposing surface which opposes the surface of the gravure cylinder 5 of the cylinder contact member 4e is substantially planar shape, as FIG.4 and FIG.5 shows. The cylinder contact member 4e is formed of a member having a hardness higher than that of copper on the surface of the gravure cylinder. For example, the cylinder contact member 4e is preferably a diamond member.

The cylinder contact member 4e is a fan having a fan shape in plan view and a central angle of approximately 90 °, but may be another angle. For example, the central angle may be any angle between 85 ° and 120 °. When the central angle is 90 °, there is an advantage that four cylinder contact members can be manufactured by a relatively easy process of dividing a cylinder contact member having a circular plan view into four equal parts.

Here, the opposing surface of the cylinder contact member 4e that faces the surface of the gravure cylinder 5 has a shape in which burrs are unlikely to enter the gap between the surface of the cutter portion 4d and the surface of the gravure cylinder. Specifically, the shape of the opposing surface of the cylinder contact member 4e that faces the surface of the gravure cylinder 5 has a shape that does not have a curvature in the rotation direction of the gravure cylinder 5, or a curvature that does not allow burr to enter the gap. It has a shape (substantially planar shape).

Further, the facing surface of the cylinder contact member 4e that faces the surface of the gravure cylinder 5 has a shape that sufficiently secures a contact area in a direction orthogonal to the rotation direction of the gravure cylinder 5. Specifically, the shape of the opposing surface of the cylinder contact member 4e that faces the surface of the gravure cylinder 5 is a shape that does not have a curvature in a direction orthogonal to the rotation direction of the gravure cylinder 5, or a curvature that does not impair the contact area. It has a shape (substantially planar shape).

The cutter part 4d including the cylinder contact member 4e is fixed to the main body part 4a via the arm support 4h and is scraped off by the engraving needle 2c to remove burrs remaining on the surface of the gravure cylinder 5.

When the cutter part 4d is positioned with respect to the arm part 4g, the through hole 4y provided in the pedestal 4f and the fastening hole 4x provided in the arm part 4g are arranged at the same position. By fastening a fastening screw (not shown) in the fastening hole 4x in this arrangement state, the cutter part 4d is fixed to the arm part 4g.

The arm support 4h is a member that supports the arm portion 4g, and is capable of turning in the direction indicated by the arrow in FIG. 3 around the turning axis C shown in FIG. The turning axis C is substantially parallel to a surface (opposing surface) that is orthogonal to a rocking shaft 4r described later and faces the surface of the gravure cylinder 5 of the cylinder contact member 4e.

As shown in FIG. 3A, a pair of side members 4l and 4m are fixed to the arm support 4h. A countersink hole is formed on the back side of the side member 4l, and one end of the coil spring 4q is fixed. On the other hand, the other end of the coil spring 4q is fixed to a countersink hole formed in the main body portion 4a. The arm support 4h is given a turning force in the counterclockwise direction in FIG. 3 about the turning axis C by the force by which the coil spring 4q contracts.

A female screw hole is provided in the side member 4m. An adjustment rod 4p having a male screw formed on the outer peripheral surface is inserted into the female screw hole. The adjustment rod 4p is a member that receives an adjustment operation (operation for rotating the adjustment rod 4p) from the operator, and a tip end portion is abutted against the main body portion 4a. The operator can move the side member 4m upward in FIG. 3A by performing an adjustment operation on the adjustment rod 4p. When the side member 4m moves upward in FIG. 3A, the arm support 4h turns around the turning axis C in the clockwise direction of FIG.

As described above, the arm support 4h is given a counterclockwise turning force by the force by which the coil spring 4q contracts, and a clockwise turning force by the adjusting rod 4p. Therefore, the operator can adjust the turning angle around the turning axis C to a desired angle by performing an adjusting operation for rotating the adjusting rod 4p. After the turning angle of the arm support 4h around the turning axis C is adjusted, the fastening bolt 4u shown in FIGS. 4 and 5 is fastened to a fastening hole (not shown) provided in the arm support 4h. Thus, the adjusted turning angle can be fixed so as not to change when engraving.

As described above, the coil spring 4q, the adjusting rod 4p, the side member 4l, and the side member 4m function as a turning angle adjusting unit that adjusts the turning angle of the facing surface with respect to the surface of the gravure cylinder 5.

2 is a member fastened to the female screw portion provided on the arm support 4h. A groove (identification part) is provided at the end of the male screw part 4i shown in FIG. The operator can adjust the fastening state with the female screw portion provided in the arm support 4h by inserting and rotating a flathead screwdriver in this groove. The arm support 4h is affixed with an identification seal 4j that is graduated so as to surround the female screw portion to which the male screw portion 4i is fastened.

The identification seal 4j is for the operator to identify the fastening state of the male screw portion 4i with respect to the female screw portion. The operator can identify the fastening state of the male screw portion 4i with respect to the female screw portion based on the relationship between the direction of the groove provided in the male screw portion 4i and the scale.

The arm support 4h is marked with S and L. S indicates Small and indicates that a contact angle suitable for the small-diameter gravure cylinder 5 can be obtained by rotating the male screw portion 4i counterclockwise. L indicates Large, which indicates that a contact angle suitable for the large-diameter gravure cylinder 5 can be obtained by rotating the male screw portion 4i in the clockwise direction.

The ventilation groove 4k is a groove provided in the upper plate 4b, the main body 4a, and the lower plate 4c, and functions as a flow path through which air sucked together with burrs by the suction duct 2g provided in the gravure engraving apparatus 1 flows. As shown in FIG. 2, the suction port of the suction duct 2g is disposed on an extension line of the ventilation groove 4k. Due to the presence of the ventilation groove 4k, the air is rectified so that the air flows in a direction suitable for suction of burrs.

In FIG. 3, female screw holes 4n and 4o are holes to which two

fastening bolts

8 and 9 inserted into two through holes provided on the upper surface of the head bracket 3 are fastened. The

fastening bolts

8 and 9 are fastened to the female screw holes 4n and 4o, respectively, so that the bar cutter 4 including the main body 4a is fixed to the head bracket 3. Therefore, the main body 4 a is fixed to the engraving mechanism including the head bracket 3 and the engraving head 2.

As shown in FIG. 2 and FIG. 3 (b), a front surface of the upper plate 4b is provided with a notch having a triangular shape in plan view. When the upper plate 4b is viewed from above, the arm support 4h can be viewed from the notch. A groove 4z is provided on the upper surface and the front surface of the arm support 4h that is visible from the notch.

When the adjustment by the turning angle adjusting portion (coil spring 4q, adjusting rod 4p, side member 4l, side member 4m) described above is performed, the positional relationship between the triangular notch and the groove 4z varies depending on the turning angle. Therefore, the operator can appropriately adjust the turning angle while visually confirming the positional relationship between the triangular notch and the groove 4z.

Next, adjustment of the contact angle of the opposing surface (cylinder contact member 4e) of the cutter portion with respect to the surface of the gravure cylinder 5 will be described with reference to FIGS. 4 and 5 are cross-sectional views taken along line AA of the bar cutter 4 of FIG. 4 and 5, the arrow shown in the gravure cylinder 5 indicates the rotation direction of the gravure cylinder 5.

FIG. 4 shows the bar cutter 4 when the gravure cylinder 5 having a long circumferential length is mounted on the gravure engraving apparatus 1. Further, FIG. 5 shows the bar cutter 4 when the gravure cylinder 5 having a short circumferential length is attached to the gravure engraving apparatus 1. The gravure engraving apparatus 1 is equipped with gravure cylinders 5 having various circumferential lengths, and the range of the circumferential length is generally 400 mm to 1500 mm.

4 and 5, the swing shaft 4r is a shaft that is fixed to the arm support 4h, and is inserted into a through hole (not shown) provided in the arm portion 4g. The swing shaft 4r is substantially parallel to the rotation shaft (not shown) of the gravure cylinder. Therefore, by swinging the arm portion 4g about the swing shaft 4r, the contact angle of the facing surface of the cylinder contact member 4e with respect to the surface of the gravure cylinder 5 (the surface facing the surface of the gravure cylinder 5) is adjusted.

As described above, the cutter portion 4d is fixed to one end of the arm portion 4g. On the other hand, a counterbore hole is provided at the other end of the arm portion 4g, and one end of a coil spring 4t (biasing member) is inserted. The other end of the coil spring 4t is inserted into a through hole provided in the arm support 4h. A female screw portion is formed on the inner peripheral surface of the through hole, and a male screw portion 4s is fastened to the female screw portion. The other end of the coil spring 4t is abutted against the tip of the male screw portion 4s while being inserted into the through hole. The operator can adjust the strength of the urging force that the coil spring 4t applies to the arm portion 4g by adjusting the fastening state of the male screw portion 4s.

In this way, the other end of the arm portion 4g is given a biasing force that causes the arm portion 4g to swing counterclockwise around the swing shaft 4r. The other end of the arm portion 4g to which the urging force is applied by the coil spring 4t is abutted against the tip of the male screw portion 4i (abutting member). The operator can move the male screw portion 4i in the left-right direction in FIG. 4 by performing an adjustment operation for rotating the male screw portion 4i. When the male screw portion 4i moves in the right direction in FIGS. 4 and 5, the arm portion 4g is given a swinging force in the clockwise direction in FIGS. 4 and 5 about the swing shaft 4r.

As described above, the arm portion 4g is given a counterclockwise swinging force by the force by which the coil spring 4t is extended, and is given a clockwise swinging force by the male screw portion 4i. Therefore, the operator can adjust the swing angle of the arm portion 4g around the swing shaft 4r to a desired angle by performing an adjustment operation for rotating the male screw portion 4i. And since the cutter part 4d is being fixed to the end of the arm part 4g, the contact angle of the opposing surface of the cylinder contact member 4e with respect to the surface of the gravure cylinder 5 is adjusted.

That is, the coil spring 4t (biasing member) and the male screw portion 4i (butting member) function as a contact angle adjusting unit that adjusts the contact angle. Further, the male screw portion 4i receives an adjustment operation (operation for rotating the male screw portion 4i) by the operator, and adjusts the contact angle according to the adjustment operation.

The gravure engraving apparatus 1 can be equipped with gravure cylinders 5 having different circumferential lengths, but the rotation axis of the gravure cylinder 5 is fixed at a fixed position regardless of the circumferential length. Moreover, the contact position of the opposing surface of the cylinder contact member 4e with respect to the gravure cylinder 5 is the same position in the height direction. As described above, the circumferential length of the gravure cylinder 5 shown in FIG. 5 is shorter than the circumferential length of the gravure cylinder 5 shown in FIG.

Therefore, in order to keep the contact angle of the opposed surface of the cylinder contact member 4e to the surface of the gravure cylinder 5 constant (substantially parallel), it is necessary to swing the arm portion 4g according to the circumferential length of the gravure cylinder 5. . By swinging the arm portion 4g, the contact angle of the facing surface of the cylinder contact member 4e with the surface of the gravure cylinder 5 is adjusted.

In the present embodiment, the contact position of the opposed surface of the cylinder contact member 4e to the gravure cylinder 5 is above the rotation axis of the gravure cylinder 5. Therefore, as the circumferential length of the gravure cylinder 5 becomes shorter, it is necessary to bring the facing surface of the cylinder contact member 4e closer to the gravure cylinder 5 than the position of the engraving needle 2c. Further, as the circumferential length of the gravure cylinder 5 becomes shorter, it is necessary to incline the facing surface of the cylinder contact member 4e with respect to the surface of the gravure cylinder 5.

As shown in FIG. 5, in this embodiment, when the circumferential length of the gravure cylinder 5 is short, the arm portion 4 g is swung counterclockwise so that the surface of the cylinder contact member 4 e facing the surface of the gravure cylinder 5 It is tilted. By doing in this way, irrespective of the circumferential length of the gravure cylinder 5, the contact angle of the opposing surface of the cylinder contact member 4e with respect to the surface of the gravure cylinder 5 can be kept constant (substantially parallel).

As shown in FIG. 1, the positional relationship in the height direction between the engraving needle 2c and the cutter portion 4d is fixed. Therefore, in order to appropriately bring the cylinder contact member 4e into contact with the surface of the gravure cylinder 5, it is necessary to appropriately adjust the relative position of the bar cutter 4 with respect to the engraving head 2 in a direction orthogonal to the surface of the gravure cylinder 5. . Specifically, when the gravure cylinder 5 is replaced with one having a short circumferential length, it is necessary to move the relative position of the bar cutter 4 with respect to the engraving head 2 in a direction approaching the gravure cylinder 5.

Adjustment of the relative position of the bar cutter 4 with respect to the engraving head 2 will be described with reference to FIG. 6A and 6B are right side views showing the gravure engraving apparatus 1 according to the embodiment of the present invention, in which FIG. 6A shows a case where the circumferential length of the gravure cylinder 5 is long, and FIG. The case where the length is short is shown.

As shown in FIG. 6, the head bracket 3 to which the bar cutter 4 is fixed can swing in the direction indicated by the arrow in FIG. The head bracket 3 is given a biasing force in a direction of swinging counterclockwise in FIG. 6 about the swing shaft 6 by a biasing member (not shown).

The head bracket 3 is provided with a through hole 3a, and a fastening bolt 7 is inserted into the through hole 3a. The fastening bolt 7 is fastened to the fastening hole 2h provided in the engraving head 2, but is not fastened to the through hole 3a. The screw head of the fastening bolt 7 and the vicinity of the fastening hole 2 h of the engraving head 2 function as a regulating member that regulates the swing range when the head bracket 3 swings around the swing shaft 6. When the engraving mechanism including the engraving head 2 and the head bracket 3 is separated from the gravure cylinder 5, the head bracket 3 swings counterclockwise and is regulated by the screw head of the fastening bolt 7. .

In order to engrave the gravure cylinder 5, when the engraving mechanism is moved in the direction approaching the gravure cylinder 5 by the moving mechanism, first, the cylinder contact member 4 e of the bar cutter 4 contacts the surface of the gravure cylinder 5. At this time, the tip of the sliding shoe 2d is not in contact with the surface of the gravure cylinder 5, and the engraving mechanism further moves in a direction closer to the gravure cylinder 5. With this movement, force is applied to the cylinder contact member 4e from the surface of the gravure cylinder 5, and the head bracket 3 swings in the clockwise direction in FIG.

Thereafter, the tip of the sliding shoe 2d hits the surface of the gravure cylinder 5, and the movement of the engraving mechanism is stopped. In the case of the gravure cylinder 5 having a short circumferential length shown in FIG. 5, the tip of the sliding shoe 2 d hits the surface of the gravure cylinder 5 in the state shown in FIG. On the other hand, in the case of the gravure cylinder 5 having a long circumferential length shown in FIG. 4, the tip of the sliding shoe 2 d hits the surface of the gravure cylinder 5 in the state shown in FIG. Then, the relative position of the bar cutter 4 with respect to the engraving head 2 is adjusted in the state shown in each of FIGS. 6 (a) and 6 (b).

As described above, the bar cutter 4 of the present embodiment is fixed to the main body 4a, which is fixed to the engraving mechanism including the engraving needle 2c for engraving the surface of the cylindrical gravure cylinder 5, and the main body 4a is engraved. A cutter portion 4d that removes burrs generated by engraving by the mechanism is provided, and the opposed surface of the cylinder contact member 4e provided in the cutter portion 4d that faces the surface of the gravure cylinder 5 has a substantially planar shape.

According to the bar cutter 4 of this embodiment, the opposed surface of the cylinder contact member 4e that removes burrs that faces the surface of the gravure cylinder 5 has a substantially planar shape. Therefore, burrs are unlikely to enter the gap between the surface of the cylinder contact member 4 e and the surface of the gravure cylinder 5, and scratches on the surface of the gravure cylinder 5 due to the burrs being pressed against the gravure cylinder 5 are less likely to occur. Further, a contact area where the cylinder contact member 4e and the gravure cylinder 5 are in contact with each other is sufficiently secured, and the pressure with which the cylinder contact member 4e presses the gravure cylinder 5 is sufficiently dispersed. Therefore, it is possible to remove burrs well without damaging the surface of the gravure cylinder 5.

Further, the bar cutter 4 according to the present embodiment has a cutter portion 4d fixed at one end, an arm that can swing around a swing shaft 4r that is substantially parallel to the rotation axis of the gravure cylinder 5 and fixed to the main body portion 4a. 4 g, a male screw part 4 i that adjusts the contact angle of the facing surface with respect to the surface of the gravure cylinder 5 by swinging the arm part 4 g and a coil spring 4 t (contact angle adjusting part).

According to the bar cutter 4 of the present embodiment, when the gravure cylinder 5 having a different circumferential length is mounted, the arm portion 4g is swung so that the gravure cylinder 5 on the opposite surface of the cylinder contact member 4e included in the cutter portion 4d is provided. By adjusting the contact angle with the surface, a contact angle suitable for the gravure cylinder 5 can be obtained.
By doing in this way, the bar cutter 4 which can remove a burr | flash favorably without damaging the surface of the gravure cylinder 5 irrespective of the circumferential length of the gravure cylinder 5 which the gravure engraving apparatus 1 engraves is provided. be able to.

In the bar cutter 4 of this embodiment, the male screw portion 4i receives an adjustment operation by an operator, and the contact angle is adjusted according to the adjustment operation. By doing in this way, when the gravure cylinder 5 from which circumference differs differs is attached, the contact angle with respect to the surface of the gravure cylinder 5 of the opposing surface of the cylinder contact member 4e with which the cutter part 4d is equipped respond | corresponds to adjustment operation by an operator. The contact angle suitable for the gravure cylinder can be obtained.

Further, the bar cutter 4 of the present embodiment is abutted against a coil spring 4t that applies an urging force to the other end of the arm portion 4g and the other end that is provided with the urging force by the coil spring 4t, depending on the adjustment operation. And a male screw portion 4i whose position with respect to the main body portion 4a changes.
By doing in this way, the position with respect to the main-body part 4a of the external thread part 4i changes according to an operator's adjustment operation, and the arm part 4g rocks in connection with it. And the contact angle with respect to the surface of the gravure cylinder 5 of the opposing surface of the cylinder contact member 4e with which the cutter part 4d is equipped is adjusted by swinging of the arm part 4g, and it can be set as the contact angle suitable for the gravure cylinder 5.

Moreover, the bar cutter 4 of this embodiment is provided with the groove | channel (identification part) which can identify the fastening state with respect to the internal thread part of the main-body part 4a in the external thread part 4i.
By doing in this way, an operator contacts the surface of the gravure cylinder 5 of the opposing surface of the cylinder contact member 4e with which the cutter part 4d is provided, recognizing the fastening state of the male screw part 4i by the groove of the male screw part 4i. The angle can be adjusted appropriately. For example, the worker can easily perform an appropriate adjustment operation according to the circumferential length of the gravure cylinder 5 by storing the relationship between the circumferential length of the gravure cylinder 5 and the fastening state of the male screw portion 4i. be able to.

Further, in the bar cutter 4 of the present embodiment, the arm portion 4g changes the angle of the facing surface with respect to the surface of the gravure cylinder 5 around the turning axis C orthogonal to the swing shaft 4r and substantially parallel to the facing surface. And a mechanism for adjusting the turning angle of the facing surface with respect to the surface of the gravure cylinder 5 by turning the arm portion 4g.
By doing in this way, the bar cutter 4 which can adjust appropriately the turning angle of the opposing surface of the cutter part 4d with respect to the surface of the gravure cylinder 5, and can remove a burr | flash favorably can be provided.

As for the bar cutter 4 of this embodiment, the cutter part 4d is attached to the arm part 4g so that attachment or detachment is possible.
By doing in this way, when exchanging cutter part 4d for re-polishing, the contact angle with respect to the surface of gravure cylinder 5 of the opposed surface of cylinder contact member 4e with which cutter part 4d before and after exchange is provided can be maintained. it can. Therefore, the work of adjusting the contact angle again with the replacement of the cutter portion 4d is not necessary.

[Other Embodiments]
In this embodiment, when the engraving mechanism is moved in the direction approaching the gravure cylinder 5 by the moving mechanism, the cylinder contact member 4e of the bar cutter 4 is first brought into contact with the surface of the gravure cylinder 5. An aspect may be sufficient. For example, the cylinder contact member 4e may come into contact with the surface of the gravure cylinder 5 after the tip of the sliding shoe 2d hits the surface of the gravure cylinder 5.

In the present embodiment, as shown in FIG. 2, the cylinder contact member 4e having a sector shape in plan view and a central angle of approximately 90 ° is used, but other modes may be used. For example, as shown in FIG. 7, a cylinder contact member 4′e having a substantially rectangular plan view may be used.
FIG. 7 is a front view showing a cutter portion 4′d of another embodiment. In FIG. 7, the configuration other than the cylinder contact member 4′e is the same as that in FIG.

In the cylinder contact member 4′e shown in FIG. The cylinder contact member 4'e is formed of a member having a hardness higher than that of copper on the surface of the gravure cylinder, and is preferably a member made of diamond, for example.

As shown in FIG. 7, in the cylinder contact member 4 ′ e, a straight line portion from P <b> 1 to P <b> 2 is a portion for removing burrs remaining on the surface of the gravure cylinder 5. P0 between P1 and P2 is the midpoint of the line segment from P1 to P2. The length of the cylinder contact member 4′e along the rotation direction of the gravure cylinder 5 at a portion where the burr is removed is L2 shown in FIG. On the other hand, in the case of the cylinder contact member 4e of FIG. 2 indicated by a two-dot chain line in FIG. 7, the length along the rotation direction of the gravure cylinder 5 is L1. As shown in FIG. 7, L2 is longer than L1.

The cylinder contact member 4′e has a length L2 along the rotation direction of the gravure cylinder 5 that is longer than that of the cylinder contact member 4e of FIG. Can be reduced. This is because the length L2 along the rotation direction of the gravure cylinder 5 is increased, so that the burr can be appropriately removed from the gravure cylinder 5 having a wide circumferential length.

For example, when the position of P0 of the cylinder contact member 4′e is in contact with the gravure cylinder 5 having a certain circumferential length, the contact angle determined by the contact angle adjusting unit is maintained and different circumferential lengths are maintained. When the gravure cylinder 5 is replaced, the contact position of the cylinder contact member 4'e with the gravure cylinder 5 changes. Specifically, if the gravure cylinder 5 is replaced with a long circumference, the contact position moves from P0 to P2. If the gravure cylinder 5 is replaced with a short circumferential length, the contact position moves from P0 to P1.
In this case, although the contact position changes, the burr can be appropriately removed without performing the contact angle adjustment operation by the contact angle adjustment unit.

Accordingly, by using the cylinder contact member 4′e shown in FIG. 7 instead of the cylinder contact member 4e shown in FIG. 2, the contact angle using the contact angle adjusting unit when the gravure cylinder 5 having a different circumferential length is replaced. The frequency of the adjusting operation can be reduced. Various lengths can be adopted as the length L2 of the cylinder contact member 4'e along the rotation direction of the gravure cylinder 5. For example, when the circumferential length of the gravure cylinder 5 in contact at P0 is Dmm, the position where the gravure cylinder 5 having a circumferential length of D + 200 mm contacts is P2, and the gravure cylinder 5 having a circumferential length of D-200 mm is in contact. It is desirable to select L2 so that the position to perform becomes P1.

DESCRIPTION OF SYMBOLS 1 Gravure engraving apparatus 2 Engraving head 2a Stylus

2b Vibration shaft

2c Engraving needle

2d Sliding shoe 3 Head bracket 4 Bar cutter

4a Body part

4d, 4'd Cutter part 4e, 4'e Cylinder contact member 4g Arm part 4i Male thread part ( Abutting member)
4j Identification seal 4r Oscillating shaft 4t Coil spring (biasing member)
5 Gravure cylinder 6

Oscillating shaft

7, 8, 9 Fastening bolt C Rotating shaft

Claims

A main body fixed to an engraving mechanism for engraving the surface of a cylindrical gravure cylinder;
A cutter part fixed to the main body part and removing burrs generated by engraving by the engraving mechanism,
A bar cutter, wherein a surface of the cutter portion that faces the surface of the gravure cylinder is substantially planar.
An arm portion that is fixed at one end, and is swingable about a swing shaft that is substantially parallel to a rotation axis of the gravure cylinder and fixed to the main body;
A contact angle adjusting unit that adjusts a contact angle of the facing surface with respect to the surface of the gravure cylinder by swinging the arm unit;
The bar cutter according to claim 1, comprising:
3. The bar cutter according to claim 2, wherein the contact angle adjusting unit receives an adjustment operation by an operator and adjusts the contact angle according to the adjustment operation.
The contact angle adjusting unit is
A biasing member that applies a biasing force in one direction of swinging to the other end of the arm portion;
An abutting member that is abutted against the other end from the direction facing the urging force of the urging member, and whose position relative to the main body changes according to the adjustment operation;
The bar cutter according to claim 3, comprising:
The abutting member is
A male screw part fastened with a female screw part provided in the main body part;
An identification part that allows the operator to identify the fastening state of the male screw part to the female screw part,
The bar cutter according to claim 4, wherein a tip end of the male screw portion is abutted against the other end portion.
The arm portion is pivotable in a direction that changes an angle of the facing surface with respect to a surface of the gravure cylinder, with a pivot shaft orthogonal to the swing axis and substantially parallel to the facing surface;
The bar according to any one of claims 2 to 5, further comprising a turning angle adjusting unit that adjusts a turning angle of the facing surface with respect to a surface of the gravure cylinder by turning the arm portion. cutter.
The bar cutter according to any one of claims 2 to 6, wherein the cutter part is detachably attached to the arm part.
An engraving mechanism for engraving the surface of a cylindrical gravure cylinder;
A holding member for holding the engraving mechanism;
The bar cutter according to any one of claims 1 to 7, which is fixed to the holding member,
A gravure engraving apparatus comprising: