JP4197118B2 - Gap adjustment device in application section - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for adjusting the gap between the two members, in particular, printing machine, the gap between the two rolls provided for the coating unit such as a coating machine, or adjust the gap between the roll and the die head It is related with the apparatus to do.
[0002]
[Prior art]
In a printing machine, coating machine, etc., in order to adjust the coating amount of ink or coating liquid, the gap between two rolls provided in the coating section or the gap between the roll and the die head is precisely adjusted. For this purpose, a wedge-type gap adjusting mechanism is used as an adjusting mechanism. 3 and 4 are schematic side views showing a coating unit of a coating machine provided with a conventional wedge-type gap adjusting mechanism. In this application section, two rolls 1 and 2 are provided in order to adjust the application amount to the web (not shown). One roll 1 is fixed at a fixed position, and the other roll 2 is held on a movable table 6 held by a linear guide 5 provided on a base 4 so as to be movable in the direction of arrow AA. The gap d between the rolls 1 and 2 is adjusted by adjusting the position of the table 6. A gap adjusting mechanism 8 for adjusting the gap d between the rolls 1 and 2 is provided fixed to the base 4 and arranged in a direction orthogonal to the moving direction of the moving table 6, and its linear guide 9 A wedge member 10 that is movably held by the linear guide 9 and has a cam surface 10a, a wedge member moving device 11 such as a feed screw system that reciprocates the wedge member 10, and a movable base 6 that holds the wedge member. 10 is a driven member 12 that contacts and follows the cam surface 10a, and includes a roller 12a that is in rolling contact with the cam surface 10a, a roller holding member 12b that holds the roller 12a, and the roller 12a that is a wedge member 10. A moving table pressing device 14 such as an air cylinder that presses the moving table 6 so as to be pressed against the cam surface 10a is provided. Here, the cam surface 10a of the wedge member 10 is formed in a shape that is slightly inclined with respect to the moving direction of the movable table 6. By moving the wedge member 10, the cam surface 10a follows the inclination of the cam surface 10a. The follower member 12 is moved by a small amount, whereby the movable table 6 can be moved by a small amount.
[0003]
[Problems to be solved by the invention]
However, in the case of the conventional wedge-type clearance adjustment mechanism, even if the processing accuracy of each component is improved, the clearance adjustment accuracy is about 1 μm due to the influence of play screw, linear motion guide play, elastic deformation, etc. Was the limit. For example, when the inclination of the cam surface 10a of the wedge member 10 is 1/10, if the gap is to be reduced by 5 μm, the wedge member 10 may be moved by 50 μm. This movement causes the cam follower 12 to move by 5 μm. As a result, the gap d between the rolls 1 and 2 is reduced by 5 μm if calculated. However, due to the backlash on the machine configuration, there is some variation in the amount of movement actually obtained. In some cases, the movement amount is 4.8 μm, and in other cases, the movement amount is 5.4 μm. Thus, it was difficult to accurately obtain a moving amount of 5 μm. For this reason, it is difficult to adjust the submicron order (less than 1 μm), which hinders the improvement of coating accuracy, and it has become impossible to meet the recent product specifications that require higher coating accuracy.
[0004]
The present invention has been made in view of such a situation, and in a printing machine, a coating machine, etc., a gap between two members, such as two rolls provided in an application part or a roll and a die head, is submicron. and to provide an adjustable gap adjustment advice service location in order.
[0005]
[Means for Solving the Problems]
According to the present invention, a piezoelectric actuator capable of adjusting its length by adjusting an applied voltage is arranged in a gap adjusting mechanism for adjusting a gap between two members, and a voltage applied to the piezoelectric actuator is adjusted. The gap is finely adjusted. The piezoelectric actuator used here is also called a piezoelectric element, and the amount of expansion and contraction changes according to the applied voltage, and its length can be adjusted very precisely, for example, on the order of submicrons. By adjusting the voltage applied to the piezoelectric actuator, the gap between the two members can be finely adjusted on the order of submicrons.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A gap adjusting device according to the present invention is an apparatus for adjusting a gap between two rolls or two rolls or die heads, which are two members whose gap should be adjusted, provided in an application section of a printing machine, a coating machine or the like. Holding the one of the two members whose gap is to be adjusted, and holding the movable table in a linear motion guide so that the gap between the one member and the other member can be adjusted. A wedge adjustment mechanism provided with a gap adjustment mechanism that adjusts a gap between the two members by moving the wedge adjustment mechanism, wherein the gap adjustment mechanism is reciprocally movable in a direction crossing the moving direction of the moving table; A wedge member having a cam surface inclined with respect to the reciprocating direction, a wedge member moving device for reciprocating the wedge member, and a follower that is held by the moving base and contacts the cam surface of the wedge member Driven member and the driven member The piezoelectric actuator is arranged between the material and the moving table and can adjust its length by adjusting the applied voltage, and the gap can be finely adjusted by adjusting the voltage applied to the piezoelectric actuator. It is characterized by that. In this way, in the gap adjusting mechanism that adjusts the gap between the two members, a piezoelectric actuator that can adjust its length by adjusting the applied voltage is arranged, and the voltage applied to the piezoelectric actuator is adjusted by adjusting the voltage applied to the piezoelectric actuator. more that a configuration in which fine adjustment of the gap, it is possible to fine adjust the gap between the two members at the sub-micron order.
[0007]
[0008]
Furthermore, gap adjusting mechanism used in the gap adjusting device of the present invention, provided so as to be reciprocated in a direction intersecting the moving direction of the moving table which moves while holding one of the two members to be adjusted the gap A wedge member having a cam surface inclined with respect to the reciprocating direction thereof, a wedge member moving device for reciprocating the wedge member, and a cam surface of the wedge member held by the moving base in contact with one having a driven member which is driven in, by the piezoelectric actuator is configured to be disposed between the movable carriage and the driven member, by the movement of the wedge member, according to the inclination of the cam surfaces driven member and moves the moving table holding it, as a result to adjust the gap between the two members, further, by adjusting the voltage applied to the piezoelectric actuator, between a mobile platform and a driven member fine Adjusting the gap between the two members as a result of possible small adjustments.
[0009]
The gap adjusting device according to the present invention has a gap between two rolls or a gap between a roll and a die head provided in a coating unit such as a printing machine or a coating machine to adjust the amount of ink or coating liquid applied. By adopting the configuration used for the adjustment, it is possible to adjust the gap on the order of submicrons, and it is possible to increase the accuracy of the coating amount.
[0010]
Hereinafter, an embodiment in which the present invention is applied to adjustment of a gap between two rolls of a coating machine will be described with reference to the drawings. FIG. 1 is a schematic side view showing an application part of a coating machine provided with a gap adjusting device according to an embodiment of the present invention, and FIG. 2 is a partial sectional schematic side view showing an enlarged main part of the gap adjusting device. The same parts as those in the conventional example shown in FIGS. Figure 1, also applying unit shown in FIG. 2, similar to that shown in FIG. 3, in order to adjust the coating amount of the web (not shown), two rolls 1, 2 are provided, one roll 1 The other roll 2 is fixed at a fixed position, and is held by a moving table 6 held by a linear guide 5 provided on the base 4 so as to be movable in the direction of arrow AA. Therefore, the gap d between the rolls 1 and 2 can be adjusted by adjusting the position of the movable table 6. A die head may be used instead of the roll 2.
[0011]
The gap adjusting device 20 according to the embodiment of the present invention for adjusting the gap between the rolls 1 and 2 includes a wedge-type gap adjusting mechanism 8 similar to the conventional one. That is, the gap adjusting mechanism 8 is fixed to the base 4 and is arranged in a direction intersecting with the moving direction of the movable table 6 (in this embodiment, the direction orthogonal), and the linear movement A wedge member 10 movably held by a guide 9 and provided with a cam surface 10 a, a wedge member moving device 11 such as a feed screw method for reciprocating the wedge member 10, and a movable stand 6, A follower member 12 that contacts and follows the cam surface 10a, and includes a roller 12a that is in rolling contact with the cam surface 10a and a roller holding member 12b that holds the roller 12a, and the roller 12a is a cam of the wedge member 10. A moving table pressing device 14 such as an air cylinder that presses the moving table 6 so as to be pressed against the surface 10a is provided. The cam surface 10 a of the wedge member 10 is formed in a shape slightly inclined with respect to the moving direction of the moving table 6.
[0012]
The gap adjusting device 20 further includes a piezoelectric actuator 22 disposed between the driven member 12 and the movable table 6 and a control unit 24 for adjusting the voltage applied thereto. Here, the piezoelectric actuator 22 is one that can be adjusted in length on the order of submicrons. The piezoelectric actuator 22 is arranged such that its axis is in the moving direction (arrow AA direction) of the movable table 6, and thus the position of the driven member 12 in the arrow AA direction with respect to the movable table 6 is very small. By adjusting, the gap d between the rolls 1 and 2 can be finely adjusted. In addition, although illustration is abbreviate | omitted, the linear scale, the displacement meter, etc. which can measure the clearance gap d between the rolls 1 and 2 on a submicron order are also provided.
[0013]
Next, the clearance adjustment operation | movement between the two rolls 1 and 2 by the clearance adjustment apparatus 20 of the said structure is demonstrated. The clearance adjustment between the rolls 1 and 2 is performed by moving the wedge member 10 by the wedge member moving device 11 as in the prior art. As a result, the gap can be adjusted with an adjustment accuracy of about 1 μm. At this time, a constant voltage (for example, about 50 V) is applied to the piezoelectric actuator 22.
[0014]
Next, when the gap is widened by about submicron (for example, about 0.1 μm), the voltage applied to the piezoelectric actuator 22 is increased (for example, about 10 V). As a result, the piezoelectric actuator 22 expands and pushes the driven member 12 to the moving table 6 by a minute amount (about 0.1 μm). As a result, the moving table 6 moves by a minute amount in the direction away from the wedge member 10, and the roll The gap d between 1 and 2 spreads by a minute amount. On the contrary, when the gap is reduced by about submicron (for example, about 0.1 μm), the voltage applied to the piezoelectric actuator 22 is lowered (for example, about 10 V). As a result, the piezoelectric actuator 22 contracts and the driven member 12 is retracted by a minute amount (about 0.1 μm) with respect to the movable table 6, and as a result, the movable table 6 moves by a small amount in a direction approaching the wedge member 10. Then, the gap d between the rolls 1 and 2 is reduced by a small amount.
[0015]
As described above, the gap between the rolls 1 and 2 can be adjusted very precisely by adjusting the movement of the wedge member 10 of the gap adjusting mechanism 8 and adjusting the voltage applied to the piezoelectric actuator 22. More specifically, for example, when the gap is reduced by 5 μm, the wedge member 10 is moved as in the prior art. Thereby, the driven member 12 moves following the cam surface 10a. Assuming that the measurement result of the movement amount at this time is 4.8 μm, the remaining movement amount is 0.2 μm. Since it is difficult to obtain a feed amount of less than 1 μm by the conventional method alone, the voltage applied to the piezoelectric actuator 22 is gradually lowered while confirming the measured value of a linear scale, a displacement meter, or the like. The adjustment of the voltage applied to the piezoelectric actuator 22 is finished when the measurement result of the movement amount by the displacement meter or the like reaches 0.2 μm. As a result, it is possible to accurately obtain an adjustment amount of 5 μm for the gap (adjustment amount of 4.8 μm by feeding the wedge member 10, feed amount of 0.2 μm by contraction of the piezoelectric actuator 22).
[0016]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained by incorporating the piezoelectric actuator in the gap adjusting mechanism and adjusting the voltage applied to the piezoelectric actuator.
(1) Compared to the case of using only the conventional gap adjustment mechanism, fine adjustment by a piezoelectric actuator is possible, and the adjustment accuracy of gaps between rolls and between a roll and a die head can be increased. As a piezoelectric actuator, about 0.1 μm By using a material that can be adjusted in the order of submicron, the gap can be adjusted with a high accuracy of about 0.1 μm.
(2) By using the gap adjusting device of the present invention for adjusting a gap between rolls provided in an application section of a printing machine, a coating machine or the like, or between a roll and a die head, the accuracy of the coating amount can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a coating machine coating unit provided with a gap adjusting device according to an embodiment of the present invention. FIG. 2 is a partial sectional schematic side view of a main part of the gap adjusting device shown in FIG. ] Schematic side view of a coating machine application section equipped with a conventional gap adjustment mechanism [FIG. 4] Schematic side view of the main part of the gap adjustment mechanism shown in FIG.
DESCRIPTION OF SYMBOLS 1, 2 Roll 4 Base 5 Linear motion guide 6 Moving stand 8 Gap adjustment mechanism 9 Linear motion guide 10 Wedge member 10a Cam surface 11 Wedge member moving device 12 Follower member 12a Roller 12b Roll holding member 14 Moving stand pressing device 20 Clearance adjusting device 22 Piezoelectric actuator 24 Control unit

Claims (1)

A device for adjusting a gap between two rolls or two rolls or die heads, which are two members whose gap should be adjusted, provided in an application section of a printing machine, a coating machine, etc. One of the two members is held, and a moving base that is held in a linear motion guide so as to be movable so that the gap between the one member and the other member can be adjusted, and the moving base is moved between the two members. A clearance adjustment mechanism for adjusting the clearance is provided, and the clearance adjustment mechanism is a wedge member provided so as to be able to reciprocate in a direction crossing the moving direction of the moving table, and is inclined with respect to the reciprocating direction. A wedge member having a cam surface, a wedge member moving device that reciprocates the wedge member, a driven member that is held by the moving base and is driven in contact with the cam surface of the wedge member, and the driven member Arranged between the moving table A gap in the coating part is provided with a piezoelectric actuator whose length can be adjusted by adjusting the applied voltage, and the gap can be finely adjusted by adjusting the voltage applied to the piezoelectric actuator. Adjustment device.

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