JP2004034568A - Photogravure engraving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform a burr removing operation after the operation to engrave a photogravure cylinder. <P>SOLUTION: An upper arm and a beam are supported, in a freely rotatable manner, around an axis as a pivot and a cutting member for removing burrs is fixed to the beam. The length from the axis to the cutting member is the same as that from the axis to an engraving needle. The base part of the arm moves in the radial direction of a cylinder in accordance with a change in the diameter of the cylinder, but the angle at which the cutting member comes into contact with the surface of the cylinder does not change, because the upper arm rotates around the axis as a pivot. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
The present invention relates to a gravure engraving apparatus for engraving gravure printing cells on a gravure cylinder.
[0002]
2. Description of the Related Art In the field of flexible packaging used for vinyl packaging of various products, gravure printing using a gravure cylinder is used. A gravure engraving apparatus is known as an apparatus for forming a gravure printing cell for the gravure cylinder. For example, a mechanical engraving type gravure engraving apparatus that engraves a cylinder surface by vibrating a diamond engraving needle with respect to the cylinder is known. is there. In this mechanical gravure engraving apparatus, the volume of the cell is determined by changing the vibration amount of the engraving needle according to the image data. The change in the volume of the cell determines the amount of ink to be filled, and the change in the amount of ink reproduces shading during gravure printing.
[0003]
When the surface of the gravure cylinder is engraved by the gravure engraving needle, the shaved portion becomes fragments and peels off from the surface to form cells on the surface. However, the debris may not completely separate from the cylinder surface. This residual portion is called burr and is removed after the engraving operation. This operation is called a deburring operation.
[0004]
[Problems to be solved by the invention]
The deburring operation is performed by engraving with a gravure engraving needle and then bringing a member called a cutter member into contact with the surface of the rotating gravure cylinder. Although the detailed description of the structure of the cutter member and the mechanism for holding the cutter member will be described later, it is desirable that the cutter member is in contact with the gravure cylinder surface at a fixed angle. It is desirable that the cutter member is in contact with the gravure cylinder surface at the same position.
[0005]
However, the conventional holding mechanism of the cutter member has a problem that every time the diameter of the gravure cylinder is changed, the angle and the position at which the cutter member contacts the gravure cylinder are changed.
[0006]
Hereinafter, the entire configuration of the gravure engraving apparatus and the cutter member holding mechanism will be sequentially described.
[0007]
7 is a front view showing an example of a conventional gravure engraving apparatus, FIG. 8 is a top view of the apparatus, and FIG. 9 is a side sectional view of the apparatus.
[0008]
In the figure, the gravure engraving apparatus has a base 1, a headstock 2 and a tailstock 3 for rotatably holding a gravure cylinder GC, and an engraving mechanism 4 for engraving the gravure cylinder GC.
[0009]
The headstock 2 is fixed on the base 1 and rotatably supports a support portion 5 having a truncated cone shape at the tip so as to fit into a mounting hole of the gravure cylinder GC. The support section 5 is driven to rotate by a drive mechanism 6 including a motor and a belt.
[0010]
On the other hand, a support portion 7 having a conical tip is rotatably supported on the tailstock 3 so as to fit into the mounting hole of the gravure cylinder GC. Further, the tailstock 3 is movably mounted on a rail 8 provided on the base 1 so as to approach or separate from the headstock 2, and is driven by a driving mechanism including a motor 9 and a ball screw 10. The headstock 2 is configured to move toward or away from the headstock 2.
[0011]
In this gravure engraving apparatus, the gravure cylinder GC is sandwiched between the support 5 on the headstock 2 side and the support 7 on the tailstock 3 as shown by the two-dot chain line in FIG. It is driven to rotate in accordance with the rotation of the support 5.
[0012]
The engraving mechanism 4 includes a sub-scanning table 11 movable along the axial direction of the gravure cylinder GC, a sub-table 12 installed on the sub-scanning table 11, and an engraving head installed on the sub-table 12. 13 and burring removing means 14 for removing burrs after engraving.
[0013]
The sub-scanning table 11 is a flat table-shaped member that can move in a direction parallel to the axis of the gravure cylinder GC along a rail 15 provided on the base 1, and is moved and driven by a motor 16 and a ball screw 17. You. A rail 18 is provided on the sub-scanning table 11 so as to be in contact with and away from the gravure cylinder GC. The sub-table 12 is movably mounted on the rail 18. Then, the sub-table 12 is moved by a motor 19 and a ball screw 20 in a direction of coming into contact with and separating from the cylinder surface.
[0014]
Next, the engraving head 13 and the burr removing means 14 installed on the sub-table 12 will be described with reference to FIGS. FIG. 10 is a side view of the engraving head 13, and FIG. 11 is a front view thereof.
[0015]
In the figure, the engraving head 13 includes a support 21 fixed on the sub-table 12 and a head main body 23 supported rotatably about an axis 22 with respect to the support 21. The head main body 21 is a housing frame having a storage space therein, in which a vibration mechanism (not shown) for vibrating the engraving needle 24 and a distance between the engraving needle 24 and the cylinder surface are detected. And a capacitance type sensor 26 for the purpose. Here, the engraving needle 24 is disposed so as to protrude from the head main body 21 toward the cylinder surface, and the capacitance type sensor 26 is configured to detect the distance to the cylinder surface at a position close to the engraving needle 24. Are located. Note that another non-contact distance sensor may be used instead of the capacitance sensor 26.
[0016]
On the other hand, the bottom of the head main body 23 is permanently mounted on a piezo driving means 27 fixed on the support table 21. The piezo drive means 27 is an actuator in which a plurality of piezo elements are stacked, and is capable of expanding and contracting a minute amount in the vertical direction in FIGS. 10 and 11 by applying a predetermined voltage. In this configuration, the head body 23 can be rotated about the shaft 22 by the expansion and contraction of the piezo driving means 27, so that the engraving needle 24 can be brought into and out of contact with the gravure cylinder GC by a very small amount in real time. . Instead of the piezo driving means 27, an electromagnetic actuator or a combination of a high-speed motor and a ball screw may be used.
[0017]
As shown in FIG. 11, the burr removing means 14 includes an arm member 28 arranged in a gate shape so as to surround a part of the side surface and a part of the upper surface of the head body 23, and a position of the arm member 28 above the engraving needle 24. And a cutter member 29 provided at More specifically, the cutter member 29 includes a diamond cutting tool 61, which is the same as the engraving needle 24, and a holder 62 for holding the cutting tool 61 at the tip of the arm member 28.
[0018]
The lower end of the arm member 28 is formed with a short arm portion 28a so as to have a substantially L-shaped structure when viewed from the side as shown in FIG. On the other hand, it is supported rotatably about a shaft 30. A spring 31 is fitted between the short arm portion 28a of the arm member 28 and the sub-table 12, and urges the cutter member 29 so as to contact the cylinder surface.
[0019]
On the other hand, above the short arm portion 28a, an electromagnetic solenoid 32 is provided. When a predetermined voltage is applied to the electromagnetic solenoid 32, the short arm portion 28a is pushed down, and the cutter member 29 is moved from the cylinder surface. It can be evacuated selectively.
[0020]
In FIG. 10, reference numeral 33 denotes a micrometer for manual adjustment for moving the engraving needle 24 forward or backward with respect to the cylinder surface, and finely adjusts the position of the vibration mechanism 25.
[0021]
FIG. 12 schematically shows how the contact angle and contact position of the cutter member 29 (bite 61) attached to the tip of the arm member 28 with the gravure cylinder GC change by changing the diameter of the gravure cylinder GC. This is shown in FIG.
[0022]
In FIG. 12, point O is the center of rotation of the gravure cylinder GC, point C is the position where the cutting tool 61 contacts the surface of the gravure cylinder GC, and point N is the rotation of the shaft 30 that rotatably supports the arm member 28. Each represents the center.
[0023]
First, it is assumed that the cutting tool 61 is at a position in contact with the surface of the small-diameter gravure cylinder GC. At this time, the cutting tool 61 is in contact with the gravure cylinder GC at an angle θ1 formed by the line segment NC and the line segment CO.
[0024]
Next, when the gravure cylinder GC is changed from a small-diameter one to a large-diameter one, the sub-table 12 on the sub-scanning table 11 moves along the rail 18 accordingly (see FIG. 8). Along with this, as shown in FIG. 11, the position of the shaft 30 holding the arm member 28 on the sub-table 11 moves horizontally from the point N to the point N ′ in the radial direction of the gravure cylinder GC.
[0025]
As a result, the cutter member 29 comes into contact with the surface of the gravure cylinder GC at an angle θ2, which changes from the angle θ1 when the small-diameter gravure cylinder GC is used.
[0026]
As described above, in the conventional gravure engraving apparatus, the angle at which the cutting tool 61 of the cutter member 29 contacts the gravure cylinder surface changes due to the change in the diameter of the gravure cylinder GC. For this reason, the conventional gravure engraving apparatus has a problem that the burr removing operation using the cutter member 29 cannot be performed well.
[0027]
Further, as described below, when a bite 61 having a specific shape is used, the position of the bite 61 in contact with the gravure cylinder surface is slightly shifted in the sub-scanning direction due to a change in the angle of contact with the gravure cylinder surface. Sometimes.
[0028]
The detailed shape of the cutting tool 61 is shown in the four views of FIG. As shown in this figure, the cutting tool 61 has a substantially semi-cylindrical shape, and one end surface 61a is formed as an inclined surface that intersects obliquely with respect to the axial direction of the cutting tool 61. The ridgeline 61b of the end surface 61a of the cutting tool 61 is brought into contact with the surface of the gravure cylinder GC in a state where the axial direction of the cutting tool 61 matches the sub-scanning direction. In this state, the gravure cylinder GC is rotated to perform the deburring operation.
[0029]
When the angle at which the cutting tool 61 contacts the gravure cylinder surface changes, the position at which the cutting tool 61 comes into contact moves, for example, from point A to point B along the ridgeline 61b of the end face 61a. As described above, the end surface 61a is a surface that intersects obliquely with respect to the axial direction of the cutting tool 61, that is, the sub-scanning direction of the gravure engraving apparatus. The deburring position moves in the sub-scanning direction.
[0030]
As described above, when using a cutting tool having a predetermined shape, the angle at which the cutting tool 61 contacts the gravure cylinder surface changes, so that the burr removing position of the cutting tool 61 moves by a small amount in the sub-scanning direction. There was also a problem that the cut of the burr was incomplete.
[0031]
According to a first aspect of the present invention, there is provided a gravure cylinder for holding a gravure cylinder so that a rotation center position of the cylinder is constant irrespective of a diameter of the gravure cylinder, and a gravure cylinder in accordance with an image signal. An engraving mechanism that forms cells on the surface of the gravure cylinder, a cutter member that comes into contact with the surface of the gravure cylinder to remove burrs generated by engraving by the engraving mechanism, and a cutter member holding unit that holds the cutter member; A moving means for moving the cutter member holding means in the radial direction of the cylinder in accordance with a change in the diameter of the gravure cylinder, wherein the cutter member holding means comprises: The point at which the moving direction of the moving means intersects with the surface of the gravure cylinder is defined as a base point. And a rotating shaft whose relative positional relationship with the base point is kept constant irrespective of a change in the diameter of the gravure cylinder, and which is rotatable around the rotating shaft and holds the cutter member. Means having an arm, wherein the arm is configured such that the length from the cutter member held by the arm to the rotation axis is the same as the length from the rotation axis to the base point. It is characterized by the following.
[0032]
According to a second aspect of the present invention, in the first aspect of the invention, the engraving mechanism is arranged at the same position as the base point with respect to a plane orthogonal to the rotation axis of the gravure cylinder, and the engraved portion is located on the surface of the gravure cylinder. It is characterized by being constituted so that it may contact.
[0033]
According to a third aspect of the present invention, in the second aspect of the invention, the cutter member holding unit and the engraving mechanism are mounted on a common sub-table, and the moving unit attaches the sub-table to the sub-table. It is a means for moving the gravure cylinder in the radial direction.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, in the present embodiment, a burr removing unit according to the present invention will be described with reference to the drawings.
[0035]
FIG. 1 is a side sectional view of a gravure engraving apparatus using an engraving mechanism 104 according to the present invention. The same members as those of the above-described conventional gravure engraving apparatus are denoted by the same reference numerals, and detailed description is omitted.
[0036]
The engraving mechanism 104 according to the present invention is mounted on the sub-table 12 similarly to a conventional gravure engraving apparatus. The sub-table 12 is mounted on a pair of rails 18 installed on the sub-scanning table 11, and is movable in a direction approaching and separating from the gravure cylinder GC by a motor 19 and a ball screw 20 (see FIG. 8). It has been.
[0037]
The engraving mechanism 104 includes an engraving head 113 and a burr removing unit 114 as shown in FIG. 1, and the burr removing unit 114 is provided so as to protrude above that of a conventional gravure engraving apparatus.
[0038]
Next, the engraving head 113 and the burr removing means 114 installed on the sub-table 12 will be described with reference to FIGS. FIG. 2 is a side view of the engraving head 113 and the deburring means 114 when the small-diameter gravure cylinder GC is used, and FIG. 3 is a view of the engraving head 113 and the deburring means 114 when the large-diameter gravure cylinder GC is used. FIG. 4 is a front view of the engraving head 113 and the burr removing means 114. FIG.
[0039]
In the figure, the engraving head 113 includes a support table 121 fixed on the sub-table 12 and a head main body 123 supported rotatably about an axis 122 with respect to the support table 121. The head main body 123 is a housing frame having a storage space therein, in which a vibration mechanism (not shown) for vibrating the engraving needle 124 and a distance between the engraving needle 124 and the cylinder surface are detected. And a capacitance sensor 126 for performing the operation.
[0040]
The vibration mechanism is means for rotating the shaft 136 and the stylus 137 connected to the shaft 136 according to the density signal. An engraving needle 124 for engraving the gravure cylinder GC is fixed to one end of the stylus 137.
[0041]
Here, the engraving needle 124 is arranged so as to protrude from the head main body 123 toward the cylinder surface, and the capacitance type sensor 126 can detect the distance to the cylinder surface at a position close to the engraving needle 124. Are located. Note that another non-contact distance sensor may be used instead of the capacitance sensor 126.
[0042]
The bottom portion of the head main body 123 is permanently provided on a spring 127 fixed on the support table 121. The spring 127 biases the head main body 123 so as to rotate around the axis 122.
[0043]
A suction section 142 is provided on the upper surface of the head main body 123. An opening 141 is formed on the side of the suction section 142 facing the gravure cylinder GC, and a hose 143 communicating with the opening 141 is attached to the opposite side. A suction unit (not shown) is connected to the hose 143 to provide a negative pressure to the suction unit 142. Therefore, the fragments of the gravure cylinder GC generated by engraving with the engraving needle 124 are sucked through the opening 141 of the suction part 142 and collected by the suction means via the hose 143.
[0044]
As shown in FIG. 4, the burr removing means 114 has a pair of arm members 128 disposed on the side surfaces of the head main body 123 and the suction portion 142. Each of the arm members 128 includes a lower arm 128a erected on the sub-table 12, and an upper arm 128b rotatably connected to an upper end portion of the lower arm 128b via a shaft 144.
[0045]
A beam 145 is provided between the upper ends of the pair of upper arms 128b. A cutter member 129 is provided on the beam 145 so as to face the gravure cylinder GC.
[0046]
A spring 146 for urging the upper arm 128b around the axis 144 is attached to a side surface of the upper end of the lower arm 128a. The spring 146 urges the upper arm 128b in a direction in which the cutter member 129 approaches the surface of the gravure cylinder GC. An actuator 147 is further attached to the side surface of the upper end of the lower arm 128a. When the deburring operation is not performed, the upper arm 128 is rotated around the axis 144 by the actuator 147 so that the cutter member 129 is separated from the surface of the gravure cylinder GC.
[0047]
At the upper end of the beam 145, a suction unit 152 is provided so that fragments of the gravure cylinder GC generated by the removal of burrs by the cutter member 129 can be collected. An opening 151 is formed on the side of the suction unit 152 facing the gravure cylinder GC, and a hose 153 communicating with the opening 151 is attached to the opposite side to provide a negative pressure to the suction unit 152. . Therefore, fragments of the gravure cylinder GC generated by removing the burrs by the cutter member 129 are sucked through the opening 151 of the suction unit 152, collected through the hose 153, and collected by the suction unit.
[0048]
The cutter member 129 includes a cutting tool 130 and a holder 131 for attaching the cutting tool 130 to the beam 145, as in the conventional gravure engraving apparatus. The shape of the cutting tool 130 is the same as that of the cutting tool 61 in the conventional gravure engraving apparatus described above with reference to FIG.
[0049]
When the gravure cylinder GC is changed from the small-diameter one shown in FIG. 2 to the large-diameter one shown in FIG. 3, similarly to the conventional gravure engraving apparatus described above with reference to FIG. A new gravure cylinder GC is replaced in the unit 7. At this time, the rotation center of the gravure cylinder GC is not changed.
[0050]
When the motor 19 moves the sub-table 12 along the rail 18, the engraving mechanism 104 moves by an amount corresponding to the change in the diameter of the gravure cylinder GC.
[0051]
Next, the gravure cylinder GC is engraved by the engraving head 113. At this time, the upper arm 128b of the burr removing means 114 is separated from the surface of the gravure cylinder GC by the actuator 147. When the engraving by the engraving head 113 is completed, the deburring operation by the deburring means 114 is performed. That is, the actuator 147 is deactivated, and the spring 146 rotates the upper arm 128b around the axis 144 so that the cutter member 129 contacts the surface of the gravure cylinder GC. At this time, the inclination angle of the upper arm 128b is shallower than when the small-diameter gravure cylinder GC is used. However, the angle at which the cutter member 129 contacts the gravure cylinder GC is exactly the same as that when the cutter member 129 contacts the small-diameter gravure cylinder GC.
[0052]
Next, the positional relationship among the engraving needle 124, the cutter member 129, and the gravure cylinder GC according to the present invention will be described with reference to FIG.
[0053]
FIG. 5 is an explanatory diagram illustrating a method of determining the position of the cutter member 129 and the position of the shaft 144.
[0054]
In this figure, the gravure cylinder GC is represented by a circle R1 with a radius r1 or a circle R2 with a radius r2 according to its size.
[0055]
First, the straight line L1 is determined. This straight line L1 is the same as the direction in which the engraving mechanism 104 moves when the diameter of the gravure cylinder is changed, and passes through the center O of the circles R1 and R2.
[0056]
Next, a point at which the straight line L1 and the circle R1 intersect is determined as a base point S. In the present embodiment, the position of this base point S when considering a plane orthogonal to the rotation axis of the gravure cylinder GC matches the engraving position by the engraving needle 124.
[0057]
Next, the position where the cutting tool 130 of the cutter member 129 contacts the surface of the gravure cylinder GC is specified as a point C.
[0058]
Next, a point N where line segment SN = line segment CN is determined. This point N coincides with the center of rotation (axis 144) of the upper arm 128b in the present embodiment. As a method of determining the point N, for example, an intersection M of a tangent L2 of the circle R1 passing through the point S and a tangent L3 of the circle R1 passing through the point C is obtained, and the intersection M passes through the point M and the center O of the circle R1. There is a method of determining an arbitrary position on a straight line.
[0059]
It is assumed that the base point S is configured to move on the straight line L1 while maintaining the relative positional relationship with the point N when the diameter of the gravure cylinder GC is changed. For example, in the present embodiment, the head main body 123 that holds the engraving needle 124 and the shaft 144 of the upper arm member 128b are on the same subtable 121. Then, since the sub-table 121 moves on the rail 18 to cope with the change in the diameter of the gravure cylinder GC, the relative positional relationship between the engraving needle 124 and the shaft 144 is changed by changing the diameter of the gravure cylinder GC. Is not changed. Therefore, the angle OSN remains constant even if the diameter of the gravure cylinder GC is changed. That is, for example, it is assumed that the radius of the gravure cylinder GC has been changed from r1 to r2. The straight line L1 is moved while maintaining the relative positional relationship between the point S and the point N to become a point S 'and a point N', respectively, but the angle OS'N 'is the same as the angle OSN.
[0060]
In the present embodiment, since the beam 145 holding the cutter member 129 and the point N serving as the center of rotation of the upper arm 128b are defined as described above, when the cutter member 129 contacts the gravure cylinder GC, The angle and the position remain constant even if the diameter of the gravure cylinder GC is changed. The reason will be described in detail below.
[0061]
In FIG. 5, the triangle OSN is congruent with the triangle ONC. This can be explained by the fact that all sides of both triangles have the same length. That is, the side ON is shared by both triangles. Also, the side OS of the triangle OSN and the side OC of the triangle OCN have the same length because both have the radius of the circle R1. The last side NS and the last side NC have the same length from the definition at the time of determining the position of the point N.
[0062]
Since the triangle OSN and the triangle OCN are congruent, the angle OSN of the triangle OSN and the angle OCN of the triangle OCN are the same.
[0063]
This triangular congruence is maintained even if the size of the gravure cylinder GC is changed. That is, when the radius of the gravure cylinder GC is changed from r1 to r2, the point S is changed to the point S ', the point N is changed to the point N', and the point C is changed to the point C ', the triangle ON'S' And the triangle ON'C 'are congruent.
[0064]
And, as described above, the angle OSN remains constant even when the diameter of the gravure cylinder GC is changed.
[0065]
The following is a summary.
[0066]
1) The triangle OSN and the triangle ONC are always congruent regardless of the diameter of the gravure cylinder GC, so that the angle OSN is always the same as the angle OCN.
[0067]
2) And, the angle OSN is mechanically configured to be kept constant irrespective of the diameter of the gravure cylinder GC.
[0068]
3) From 1) and 2), the angle OCN is always constant regardless of the diameter of the gravure cylinder GC.
[0069]
4) Since the angle OCN is always constant regardless of the diameter of the gravure cylinder GC, the angle at which the cutter member 129 (the cutting tool 130) contacts the surface of the gravure cylinder GC is kept constant.
[0070]
FIG. 6 is a schematic diagram of the surface of the gravure cylinder GC engraved by the engraving needle 144. A plurality of cells C are arranged in the main scanning direction on the surface of the gravure cylinder GC. A burr D remains in a part of each cell C.
[0071]
The deburring operation is performed by bringing the cutting tool 130 of the cutter member 129 into contact with the surface of the gravure cylinder GC while rotating the gravure cylinder GC by the drive mechanism 6 (see FIG. 7). At this time, the sub-scanning position of the cutting tool 114 is set such that the point A (see FIG. 13) on the ridge line 130b of the end face 130a of the cutting tool 130 moves along the line L4 shown in FIG. However, if the contact angle of the cutting tool 130 with respect to the surface of the gravure cylinder GC changes, as described above, the contact position of the cutting tool 130 changes from point A to point B, and accordingly, the deburring position also changes from the line L4 shown in FIG. It changes to line L5. As can be seen from FIG. 6, since no burrs D exist on the line L5, the burrs D on the cell C cannot be removed.
[0072]
However, in the present embodiment, since the contact angle of the cutting tool 130 with the gravure cylinder GC is constant, the burr removal position does not slightly move in the sub-scanning direction. Therefore, the burrs D are not removed and remain on the surface of the gravure cylinder GC.
[0073]
【The invention's effect】
According to the gravure engraving apparatus according to the first aspect, the cutter member always contacts the surface of the gravure cylinder at a constant angle regardless of the diameter of the gravure cylinder, so that burrs generated by engraving of the surface of the gravure cylinder by the engraving mechanism are excellent. Can be removed.
[0074]
According to the gravure engraving apparatus of the second aspect, the engraving mechanism is configured such that the engraved portion contacts the surface of the gravure cylinder at the same position as the base point with respect to a plane orthogonal to the rotation axis of the gravure cylinder.
[0075]
According to the gravure engraving device of the third aspect, the cutter member holding means and the engraving mechanism are mounted on the common sub-table, and the moving means is means for moving the sub-table in the radial direction of the gravure cylinder. It is easy to respond to a change in the diameter of the gravure cylinder.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a gravure engraving apparatus according to an embodiment of the present invention.
FIG. 2 is a side view of an engraving head of the gravure engraving apparatus.
FIG. 3 is a side view of an engraving head of the gravure engraving apparatus.
FIG. 4 is a front view of the engraving head.
FIG. 5 is an explanatory diagram illustrating an operation of the embodiment.
FIG. 6 is an explanatory diagram illustrating a state of a cell after engraving.
FIG. 7 is a front view of a conventional gravure engraving apparatus.
FIG. 8 is a top view of the same device.
FIG. 9 is a side sectional view of the same device.
FIG. 10 is a side view of the engraving head.
FIG. 11 is a front view of the engraving head.
FIG. 12 is an explanatory diagram for explaining a conventional problem.
FIG. 13 is a four-sided view illustrating the shape of a cutting tool bit.
[Explanation of symbols]
1 base
2 Headstock
3 tailstock
11 Sub scanning table
12 Sub-table
18 rails
19 motor
104 Engraving mechanism
113 Engraving head
114 Deburring means
121 support
122 axes
123 head body
124 engraving needle
128 arm member
128a lower arm
128b upper arm
129 Cutter member
130 bytes
131 holding member
137 stylus
144 axes

Claims (3)

Means for holding the gravure cylinder so that the rotation center position of the cylinder is constant regardless of the diameter of the gravure cylinder;
An engraving mechanism that forms cells on the surface of the gravure cylinder according to an image signal;
A cutter member that contacts a surface of the gravure cylinder to remove burrs generated by engraving by the engraving mechanism;
Cutter member holding means for holding the cutter member,
A moving means for moving the cutter member holding means in the radial direction of the cylinder in accordance with a change in the diameter of the gravure cylinder,
The cutter member holding unit is configured such that when a moving direction of the cutter member holding unit by the moving unit and a point at which the surface of the gravure cylinder intersects are defined as a base point, a relative positional relationship with the base point is determined by the gravure cylinder. A rotating shaft that is maintained constant regardless of a change in diameter, and an arm that is rotatable around the rotating shaft and that holds the cutter member;
The gravure engraving apparatus, wherein the arm is configured such that a length from the cutter member held by the arm to the rotation axis is equal to a length from the rotation axis to the base point. . 2. The gravure cylinder according to claim 1, wherein the engraving mechanism is configured such that an engraved portion thereof contacts the surface of the gravure cylinder at the same position as the base point with respect to a plane orthogonal to a rotation axis of the gravure cylinder. 3. Gravure engraving equipment. The cutter member holding means and the engraving mechanism are mounted on a common sub-table, and the moving means is means for moving the sub-table in a radial direction of the gravure cylinder. 2. The gravure engraving device according to 2.

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