JP2002361142A - Method and apparatus for controlling dipping and roll member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling dipping for forming a coating layer with an even thickness on the surface of an object to be coated without increasing the number of steps for speed control and its apparatus and a roll member having a coating layer with excellent surface property. SOLUTION: A moving velocity V of a roll member 15 is controlled by detecting the arrival position of the roll member 15 by calculating the moving distance L of a material supporting stand 14 holding the roll member 15 based on the output of an encoder 18 attached to a servomotor 11 and setting an aimed velocity V0 at the position based on the data of the detected arrival position and the L-V0 map 23 which defines the relation between previously memorized arrival positions and the moving velocity values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dipping control method and a dipping control method for controlling the moving speed of the object to be coated when the object to be coated is immersed in a dipping tank.
The present invention relates to a roll member having a coating film layer formed on the surface by dipping.

[0002]

2. Description of the Related Art FIG.
No. 46935, dipping coating apparatus 5
FIG. 3 is a diagram showing a configuration of a zero. This dipping coating equipment 5
0 indicates that the workpiece 52 suspended on the hanger 51 is transferred by a horizontal moving means (not shown) to a position just above the dip tank 54 filled with the coating liquid 53,
Is moved upward along the guide member 55 by a vertical moving means 56 provided on the guide member 55 and having a motor 56a, a chain 56b, and a relay pulley 56c, as shown in FIG. After the object 52 to be coated is immersed in the dip tank 54,
Is lowered to pull up the object 52 from the dip tank 54 to form a coating layer on the surface of the object 52. At this time, the moving speed of the dip tank 54 is controlled according to, for example, a step-like speed control program that is changed every predetermined time as shown in FIG.

[0003] Next, the dipping coating apparatus 5 having the above-described configuration is used.
The operation of 0 will be described with reference to FIG. First, the motor 56a is driven and the dip tank 54 is moved at a constant speed V until the object 52 reaches the liquid level 53 of the dip tank 54.
It is raised by ₁ (step S1). Next, dip tank 5
4 is slowed down (V ₁ → V ₂ ), and the object 5
After it was 2 completely raises the dipping tank 54 by the speed V ₂ until immersed in a dip tank 54 (step S2), and holding the object to be coated 52 within the predetermined time dipping tank 54 (step S3 ). Thereafter, it lowers the dipping tank 54 at a speed V ₂ rotates the motor 56a in the reverse direction,
The work 52 is lifted from the dip tank 54 (step S4). Finally, when the object 52 is completely exposed to the air, the ascending speed of the dip tank 54 is increased (V ₂ → V ₁ ), and the object 52 is returned to the initial position (Step S5). In the above example, a large number of workpieces 52
In order to continuously process, the object to be coated 52 is dipped by moving the dip tank 54, but in general, the dip tank 54 is fixed and the object to be coated 52 is moved upward and downward. The method of moving is adopted.

[0004] Such position control of a moving body is usually performed by a position control device using a servomotor. FIG.
FIG. 1 is a diagram showing a configuration of a servo control device 60 described in, for example, Japanese Patent Application Laid-Open No. 2000-322105. In this servo control device 60, a servo motor connected to a ball screw 62 supporting a stage 61 which is a moving body. By controlling the rotation of 63, the position and speed of the stage 61 are controlled. In detail, the output of the encoder 64 attached to the servomotor 63 is input to the position calculating means 65 to detect the position x of the stage 61, and the detected position x and the position / speed command value setting unit 66 Sent,
The speed controller 6 compares the preset command position x ₀ with the speed controller 6.
7, the current for driving the servo motor 63 is controlled in accordance with the position difference (Δx = x ₀ −x) to rotate the ball screw 62 and control the position of the stage 61. In this case, inputs the output of the encoder 64 to the difference calculator 68 calculates the rotational speed V of the servomotor 63, the speed controller 67 compares the command speed V ₀ set in advance and the speed V Thus, the drive current for driving the servo motor 63 is controlled.

[0005]

However, the above control method controls the rotation speed of the servo motor 63 so that the moving body reaches a predetermined position at a predetermined time.
Since the control is based on a so-called "speed loop", if the control is applied to dipping coating in which the moving speed of the object 52 at a predetermined position is regarded as important, the finish of the coating layer is deteriorated. was there. That is, in the control system, typically for practical is often delayed position relative to the command position, for example, in the example, when raising the object to be coated 52 described above from dipping tank 54, the time when it reaches the t = t ₅ Then, even if a part of the object 52 is in the dip tank 54, the process proceeds to the next step and the pulling speed is increased. Since the film thickness of the coating layer formed by dipping depends on the pulling speed of the object 52, if the pulling speed changes as described above, uneven coating may occur on the object 52 or the surface of the coating layer may change. There is a problem that the undulation, that is, the change in the film thickness in the direction in which the object 52 is pulled up becomes large. In particular, when a coating layer is formed on the surface of the workpiece 52 using an aqueous resin, the drying of the coating liquid 53 is slower than that of a solvent-based resin, so that uneven coating and undulation of the surface are further increased. .

Therefore, when dipping a work 52 requiring a surface property such as a roll member such as a charging roller used in a copying machine or a facsimile machine, the moving speed is reduced as shown in FIG. There is also a method in which the number of steps of the speed control program to be changed is increased to finely control the moving speed of the object 52 to smooth the change in the moving speed during dipping. However, the speed control program of the object 52 needs to be changed depending on the size and shape of the object 52 or the characteristics of the paint to be dipped. In addition, the setting of the speed becomes complicated and it takes time to create a program. In addition, the memory capacity must be increased and the calculation speed must be increased.

[0007] The present invention has been made in view of the conventional problems, and without increasing the number of speed control steps.
It is an object of the present invention to provide a dipping control method and apparatus for forming a coating layer having a uniform thickness on the surface of an object to be coated, and a roll member having a coating layer having good surface properties.

[0008]

According to a first aspect of the present invention, there is provided a dipping control method for detecting the arrival position of an object to be immersed in a dip tank filled with a coating liquid and detecting the position of the object to be coated. The moving speed of the object is changed according to the detected arrival position, whereby the moving speed of the object to be coated can be controlled to the moving speed at the preset arrival position. Since it is possible, it is possible to form a coating layer having excellent surface properties without increasing the number of steps of speed control, eliminating unevenness in the moving speed of the object to be coated. The dipping control method according to claim 2, wherein when the arrival position does not reach a preset target arrival position, the moving speed of the measured object is held at the moving speed at the position. As a result, it is possible to suppress a sharp increase in the moving speed of the object to be coated which occurs in the conventional speed loop, so that the coating unevenness of the object to be coated and the undulation of the surface are reliably reduced. Becomes possible. A dipping control method according to a third aspect is characterized in that an aqueous resin is used as the coating liquid.

Further, a dipping control device according to a fourth aspect of the present invention includes a means for detecting a rotation angle of a servomotor to detect an arrival position of the object to be coated, Means for controlling the movement speed of the object to be coated based on the relationship between the arrival position and the movement speed of the object to be coated, and controlling the movement speed of the object to be coated to a movement speed at a preset arrival position. It is something to do.

According to a fifth aspect of the present invention, there is provided a roll member having a coating layer formed by using any one of the first to third methods. A roll member according to a sixth aspect is characterized in that the undulation of the surface of the coating layer is 0.01 to 5 μm.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an outline of a dipping coating apparatus 10 according to the present embodiment. In the figure, reference numeral 11 denotes a servomotor, 12 denotes a ball screw connected to the servomotor 11 via a speed reducer 13,
A shaft 15 of a roll member 15 to be coated is fixed to the ball screw 12 by a ball nut (not shown).
A material support table 16 for holding the servomotor 11 is supported by a horizontal member 16a provided on the upper portion of the frame of the base 16 and the legs 16b,
16b supports and guides both ends of the material support table. Reference numeral 17 denotes a portion below the material support table 14,
A dip tank 18L filled with a coating liquid 17L is installed to face the roll member 15, an encoder 18 is attached to the servomotor 11, and detects an angle of rotation of the servomotor 11, and 20 is an output of the encoder 18. Is a dipping control device that supplies a current for driving and controlling the servo motor 11 to the servo motor 11 based on the above.

FIG. 2 is a functional block diagram of the dipping control device 20. The dipping control device 20 calculates a moving distance L of the material support base 14 based on an output of an encoder 18 attached to the servomotor 11, Arrival position detection means 21 for detecting the arrival position of the roll member 15 which is the object to be coated, and speed calculation means 22 for calculating the moving speed V of the roll member 15 by subtracting the output of the encoder 18.
And the moving distance L detected by the arrival position detecting means 21
And data, such as shown in FIG. 3, the previously stored moving distance and the moving speed and the L-V ₀ map that sets the relation - the target speed V ₀ which the position based on the (position velocity diagram) 23
Target speed setting means 24 for setting the target speed V ₀
The driving current of the servo motor 11 is controlled based on the calculated moving speed V of the roll member 15 and the calculated moving speed V of the roll member 15, that is, the speed at which the moving speed V of the roll member 15 is controlled. A controller 25 and a motor driving means 26 for supplying a current for driving the servo motor 11 to the servo motor 11 based on the output of the speed controller 25
And controls the moving speed when the roll member 15 is lowered or raised.

FIG. 4 is a control flow showing a dipping control method according to the present invention. In this embodiment, the position and the moving speed of the roll member 15 are not time-controlled as in the prior art, but are shown in FIG. Position-speed diagram (speed control program)
Controlling the moving speed of the roll member 15 by, controlled to be the target moving velocity V ₀ which is always the position movement velocity V of the roll member 15 in accordance with. First, the initial speed is set and the servo motor 11 is driven (step S1).
0), every predetermined time, from the output of the encoder 18,
0.01 sec. The travel distance of the roll member 15 is calculated every time, and the reach distance is calculated. Roll member 1 for each
5 is controlled (step S12). And
It is determined whether or not the roll member 15 has reached a preset change position of the target moving speed (step S14). If it has reached, the process proceeds to the next step S16, where the target moving speed of the roll member 15 is changed. I do. If not, the process returns to step S12, and the target moving speed of the roll member 15 is maintained until the position reaches the position. After the change in the moving speed, the moving distance of the roll member 15 is calculated to determine the reaching distance (step S18). It is determined whether the roll member 15 has reached a preset target moving speed change position (step S20). Steps S18 and S20 for appropriately changing the target moving speed of the roll member 15 are repeated until the roll member 15 reaches a preset stationary position (step S22). When the roll member 15 reaches the stationary position, the servo motor 11 is stopped for a predetermined time (step S24). Next, after holding the roll member 15 at the stationary position for a predetermined time, the servo motor 11 is reversed to raise the roll member 15 (step S26), and the same as in the case of the above-described lowering until the roll member 15 returns to the initial position. Is performed (steps S28 to S36). Then, the roll member 15 is stopped in a state where the roll member 15 has returned to the initial position, and the dipping is completed (step S38).

Next, a method of forming a coating layer made of an aqueous resin on a charging roller (roll member 15) used in an electrophotographic apparatus such as a copying machine or a printer using the dipping control method of the present invention will be described. This will be described with reference to the time-speed / position diagram of FIG. First, the servo motor 11 is driven at the initial speed V ₁ and the shaft 15 of the roll member 15 is moved.
The material support 14 is lowered at a constant speed until the leading end of a reaches the liquid level of the dip tank 17, and when the roll member 15 is lowered to a predetermined position, the lowering speed of the material support 14 is relaxed (V ₁ → V ₂ ) The roll member 15 is gently immersed in the dip tank 17. When the roll member 15 has not descended to the predetermined position, the moving speed of the roll member 15 is held at V ₁ by delaying the change time of the moving speed, and the lowering of the material support base 14 is reached when the roll member 15 reaches the predetermined position. Slow the speed (V ₁ → V ₂ ). Next, when the main body 15b of the roll member 15 is immersed in the dip tank 17, the material support 14
Is increased (V ₂ → V ₃ ), and the roll member 15 is completely immersed in the dip tank 17. Even in the case where the movement of the material support 14 is delayed, in this example, the position of the material support 14, that is, the position of the roll member 15 is set to a predetermined position without increasing the descending speed of the material support 14. Until it reaches, the moving speed of the roll member 15 is maintained at the speed at the position, so that
Even when the immersion of the roll member main body 15b is later than the predetermined time, the roll member main body 15b can be gently immersed in the dip tank 17.

Next, after holding the roll member 15 in only the dipping vessel 17 a predetermined time, rotates the servo motor 11 in the reverse direction to raise the material support 14 at a moving speed V _3. Then, loosen gradually increasing speed of the material support 14 in the stage where the tip portion of the shaft 15a of the roller member 15 is raised to the vicinity of the liquid surface of the dipping tank 17 (V ₅ ~V ₆₎
After raising the roll member 15, slowly the roll member 15 at a constant speed V ₇ pulled from the dipping tank 17. Then, the roll member main body 15b is
When the material support 14 is completely lifted from the position, the rising speed of the material support 14 is increased (V ₇ → V ₈ ), and the roll member 15 is returned to the initial position.

If the pulling speed of the roll member 15 is uneven, coating unevenness occurs, or the surface of the coating layer undulates, that is, a change in film thickness in the pulling direction of the workpiece 52 increases. Therefore, at this stage, the control of the moving speed of the roll member 15 is important. In this example, as described above, the moving speed is maintained without changing until the material support 14 reaches the predetermined position.
If has not reached the predetermined reaching position, the change time is delayed so that the moving speed of the roll member 15 is always controlled to the target moving speed at the position. Therefore,
For example, even if the lifting of the roll member main body 15b is delayed more than a predetermined time, the roll member 15 is kept at a constant speed V.
Can be slowly pulled out of the dip tank 17, so that unevenness in the pulling speed of the roll member 15 can be eliminated, and a coating layer having excellent surface properties can be formed. For this reason, in this example, as shown in FIG. 5, the dipping operation time is longer than in the conventional case. In addition, when an aqueous resin is used as the coating liquid 17L as in this example, drying of the coating film layer is slow. Therefore, when the roll member 15 is returned to the initial position by the conventional control method, coating unevenness or surface unevenness occurs. Although the undulation was likely to be large, as in this example, by controlling the position of the moving speed of the roll member 15, the moving speed could be made uneven. It is possible to obtain a roll member having a coating layer having an excellent surface property of about 5 μm.

As described above, in the present embodiment, the moving distance L of the material support 14 holding the roll member 15 as the object to be coated is calculated based on the output of the encoder 18 attached to the servomotor 11. L-V which detects the arrival position of the roll member 15 and sets the relationship between the detected arrival position data and the previously stored arrival position and moving speed.
_Since the output of the servo motor 11, that is, the moving speed V of the roll member 15 is controlled by setting the target speed V _{0 of the} position based on the ₀ map 23, for example, For example, when the completion time is later than the predetermined time, the change time of the moving speed can be delayed so that the speed of the roll member 15 can be controlled to always be the target speed at the position. Therefore, it is possible to eliminate unevenness in the moving speed of the roll member 15 without increasing the number of steps of the speed control program, and to form a coating layer having excellent surface properties.

Examples of the water-based paint used in the above embodiment include a water-based fluororesin, a water-based acrylic resin,
An aqueous resin such as an aqueous urethane resin or a mixture of the above aqueous resins can be used. Also, the resin type may be used in any form of a water-soluble type, an emulsion type, and a suspension type. Further, the paint used in the control method of the present invention is not limited to the above-mentioned water-based resin, but may be applicable to a solvent-based resin in which acrylic, urethane, nylon, or the like is dissolved in an organic solvent such as toluene. Needless to say.

In the above embodiment, the encoder 1
8 from the output of 0.01 sec. The travel distance of the roll member 15 is calculated every
sec. The moving speed of the roll member 15 is controlled every time, and the moving speed of the roll member 15 is set to V ₁ , V ₁ , V ₂ ,.
Although varied as V _8, as the method of setting of the predetermined time interval and the moving speed control program is not limited to this, the roll member 15 the size and shape or properties of paints used Can be changed as appropriate.

<Examples> The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited to the following. On a roll member having a roll body made of polyurethane foam formed on the outer periphery of a metal shaft, a coating layer having a thickness of 50 μm was formed on the roll body surface by the dipping control method of the present invention and the conventional control method, respectively. Then, a charging roller was manufactured, and its appearance (uneven coating) and surface undulation were compared with those of a charging roller manufactured by a conventional control method. The results are shown in Table 1 below. The undulation state of the surface was evaluated by the difference between the maximum value and the minimum value of the film thickness in the length direction of the coating layer of the roll body. The coating layer was formed using an aqueous resin (Invention 1 and Comparative Example 1), and formed using a solvent-based resin (Invention 2 and Comparative Example 2). did.

[Table 1] As is clear from Table 1, the surface layer of the charging roller manufactured by the dipping control method of the present invention has no coating unevenness and a good surface undulation state despite the smaller number of control steps than the conventional method. Met. Further, it was confirmed that good surface properties can be obtained even with an aqueous resin which is difficult to control. On the other hand, in the conventional method, even if the number of control steps is increased, the surface undulation is larger than that of the present invention. In particular, in the case of an aqueous resin, both the appearance and the surface undulation state are poor, and sufficient dipping is performed. I could not control it.

[0021]

As described above, according to the present invention, the arrival position of the object to be coated immersed in the dipping tank is detected, and the moving speed of the object to be coated is determined according to the detected arrival position. Because it is changed, it is possible to suppress the rapid increase in the moving speed of the object to be coated which occurs in the conventional speed loop without increasing the number of speed control steps, and a coating layer having excellent surface properties Can be formed. In addition, the control method according to the present invention can minimize the unevenness of the moving speed of the object to be coated, so that even when an aqueous resin having a low drying rate is used as the coating liquid, a coating layer having excellent surface properties can be formed. it can. In addition, this makes it possible to obtain a roll member having a coating layer with good surface properties and used for electrophotographic devices such as copying machines and printers.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a dipping coating apparatus according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of the dipping control device according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating a relationship between a reaching position of a roll member and a moving speed.

FIG. 4 is a control flow showing a dipping control method according to the present invention.

FIG. 5 is a diagram showing a change over time of a reaching position and a moving speed of a roll member according to a control method of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional dipping coating apparatus.

FIG. 7 is a diagram showing a conventional control flow.

FIG. 8 is a diagram showing a configuration of a conventional position control device.

FIG. 9 is a diagram showing an example of a speed control program when the number of steps for moving speed setting is increased.

FIG. 10 is a diagram showing a change over time of a reaching position and a moving speed of a roll member according to a conventional control method.

[Explanation of symbols]

10 dipping coating equipment, 11 servo motor, 1
2 Ball screw, 13 Reducer, 14 Material support, 1
5 roll member, 15a shaft, 15b roll member body, 16 base, 17 dipping tank, 17L coating liquid, 18 encoder, 20 dipping control device,
21 arrival position detecting means, 22 speed calculating means, 23
_{L-V 0} maps, 24 the target speed setting means, 25 speed controller, 26 a motor driving means.

Continued on front page F-term (reference) 3J103 AA02 AA61 EA20 FA15 GA02 GA57 GA58 GA60 HA04 HA41 4D075 AB03 AB37 AB52 AB56 CA48 DA15 DC24 DC27 EA06 EA10 EA10 EA13 EB16 EB22 EB38 4F040 AA05 AA06 AB04 BA42 CC18 CC20 DA12 DA03 DA05 DA05 DA12 DA05

Claims (6)

[Claims] In a dipping control method for performing dipping by dipping an object to be coated in a dipping tank filled with a coating liquid, the dipping control method performs stepwise control of changing a moving speed of the object to be coated. While detecting the arrival position,
A dipping control method, wherein the moving speed of the object to be coated is changed according to the detected arrival position. 2. The apparatus according to claim 1, wherein the moving speed of the object to be measured is maintained at the moving speed at the position when the reaching position has not reached the preset target reaching position. 3. The dipping control method according to 1. 3. The dipping control method according to claim 1, wherein an aqueous resin is used as the coating liquid. 4. A dipping control device for controlling a rotation speed of a servomotor to control a moving speed of an object to be immersed in a dip tank filled with a coating liquid, wherein a rotation angle of the servomotor is detected. Means for detecting the arrival position of the object to be coated, and the moving speed of the object to be coated based on the detected arrival position and a predetermined relationship between the arrival position and the moving speed of the object to be coated. Controlling means for controlling the dipping. 5. A roll member having a coating layer formed by using the method according to claim 1. 6. The undulation of the surface of the coating layer is 0.01 to
The roll member according to claim 5, wherein the thickness is 5 m.