JP2680085B2 - Fine adjustment device for gap between measuring rolls of coating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) In order to make the coating amount of a coating material on a coating material uniform, the present invention provides a small gap between the measuring rolls of a coating machine. It relates to a device for adjusting.

(Prior Art) Managing the gap between the measuring rolls of the coating machine is an essential element in the coating machine, and the precision of the gap management directly affects the accuracy of the coating amount. For controlling the gap between the measuring rolls of a conventional coating machine, a direct mechanical type fine gap adjusting device between the measuring rolls and a wedge type fine gap adjusting device between the measuring rolls which are pure mechanical systems are used. That is, in the direct-acting type minute gap adjusting device between measuring rolls, the slider on which the metering roll is installed is moved back and forth by the thrust of the air cylinder. Then, a separately provided rotating shaft is rotated by a high precision reducer to rotate the ball screw shaft, and this causes the ball spline shaft screwed with this ball screw shaft to move back and forth to finely adjust the gap between the measuring rolls. .
In addition, in the wedge type micro gap adjusting device between metering rolls, the slider on which the metering roll is installed is moved back and forth by the thrust of the air cylinder, and the wedge fixed between the support bracket of the metering roll and the side of the support bracket of the coating roll. And the moving wedge are sandwiched and the moving wedge is finely moved up and down by a ball screw or the like to finely adjust the gap between the measuring rolls.

(Problems to be Solved by the Invention) However, in such a conventional direct-acting type or wedge type microscopic gap adjusting device between measuring rolls, it is a pure mechanical adjusting device and its drive system is a high-precision reducer. It is composed of a combination of ball screws. Therefore, no matter how highly accurately these components are manufactured, their elastic deformation due to external force is unavoidable, and the fine adjustment precision of the current technology is limited to about 1 μm.

Further, in order to maintain this accuracy, the size of the ball screw becomes large, and as a result, not only the entire apparatus becomes large and the cost increases, but also the operability of the apparatus deteriorates.

The present invention has been made in view of the above points, and uses a heating element or a piezoelectric element as a fine adjustment mechanism between the measurement rolls, and uses the microdeformation thereof to perform sub-micron fine adjustment between the measurement rolls. An object is to provide a minute gap adjusting device.

[Configuration of the invention]

(Means for Solving the Problem) The present invention is a coating machine provided with a coarse adjustment mechanism that adjusts a gap between measuring rolls by moving a slider on which a metering roll is mounted back and forth by a back and forth motion of a ball spline shaft. In the device for finely adjusting the gap between the measuring rolls, a fine adjustment mechanism including a heating element or a piezoelectric element is provided, and the back-and-forth movement of the slider is finely adjusted by the displacement of the heating element or the piezoelectric element.

(Operation) In the apparatus for finely adjusting the gap between the measuring rolls of the coating machine of the present invention configured as described above, first, the slider is moved back and forth by the forward and backward movement of the ball spline shaft to roughen the gap between the measuring rolls. After making adjustments, a piezoelectric element is added to the heating element or the piezoelectric element to make a minute displacement, and the back-and-forth movement of the slider is finely adjusted by that displacement to eliminate a minute deviation from the final target value and perform highly accurate positioning. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a fine gap adjusting device between measuring rolls of an embodiment of the present invention is a slider installed on a machine base 1 slidably in a direction of an arrow via a roll bearing (not shown). 2 and bracket 3 on this slider 2
The metering roll 4 is rotatably supported about O ₁ and the coating roll 5 is rotatably supported on the fixed base 13 about O ₂ . In particular, the coarse adjustment mechanism for the minute gap Δy between the metering roll 4 and the coating roll 5 includes a rotary shaft 6 built in the slider 2, a ball screw shaft 6a directly connected to the rotary shaft 6, and a ball screw shaft 6a and a ball. It consists of a ball screw 11 and a screw. A servomotor (not shown) with a high-accuracy reducer is directly connected to the rotary shaft 6. Also,
The ball spline shaft 8 bolted to a nut 12 integrated with the ball screw 11 has a spline portion at the tip thereof meshing with a spline of a ball spline 9 keyed to the slider 2. As a result, the ball spline shaft 8 which is prevented from rotating is moved forward and backward in proportion to the amount of rotation of the ball screw 11. The base end of the ball screw shaft 6a is pivotally supported by the thrust bearing 7.

Particularly, in the embodiment of the present invention, as shown in FIG.
The ball spline shaft 8 has a long hole 10c axially formed at the tip thereof.
Perforate, press the heating element or piezoelectric element 10 into it,
A fine adjustment mechanism is constructed by connecting the electric wires 10a to apply a voltage. At this time, as the piezoelectric element, a laminated piezoelectric material (for example, NTK piezo stack manufactured by Nippon Special Ceramics Co., Ltd.) that expands and contracts accurately in units of 10 μm is used. The thickness of this device is 0.1 to 1 mm PZT discs stacked 70 to 100 and made into a cylindrical shape like animal muscle fibers, and a voltage of about 400 V is applied to this to expand and contract. The expansion and contraction width of the entire element is 1 mm or less, but by appropriately adjusting the voltage, the movement of the element can be adjusted with a precision of 1 / 100,000 mm (submicron), and the element breaks along with expansion and contraction. About 1 cm ² per area
It is possible to pull out 70 kg of power.

In the gap adjusting mechanism configured as described above, when the servomotor with the high-accuracy reducer is pulse-rotated by the command value of the gap Δy from the measuring device, the rotary shaft 6 becomes the ball screw shaft.
6a is rotated, and the ball spline shaft 8 screwed with this is moved forward and backward by a predetermined amount. When the tip of the ball spline shaft 8 hits the abutting surface S finished with high accuracy, a gap Δy between the measuring rolls is secured. Next, in the embodiment of the present invention, in order to further secure the gap accuracy of about submicron, a voltage is applied to the heating element or the piezoelectric element 10 embedded in the tip portion of the ball spline shaft 8, and the voltage is adjusted by adjusting the voltage. The heating element or the piezoelectric element 10 is displaced by a force of about 70 kg / cm ² , and the ball spline shaft 8 is moved back and forth by a minute amount, so that the clearance can be finely adjusted in submicron units.

The fine adjustment mechanism including the heating element or the piezoelectric element of the present invention is applied to the conventional device for adjusting the minute gap between the measuring rolls as follows.

First, in the case of applying to a direct-acting type minute gap adjusting device between measuring rolls, as shown in FIG. 2, a slider 2a is slidably mounted in a direction of an arrow on a machine base 1a via a roll bearing or the like. A metering roll 4a pivotally supported by the center O ₁ is attached to the bracket 3a on the slider 2a. On the other hand, a bracket 3a 'is attached to a fixed base 13a fixed to the machine base 1a, and a coating roll 5a pivotally supported by the center O ₂ is attached to the bracket 3a'. Further, a heating element or a piezoelectric element 10a is internally provided at the tip of the ball spline shaft 8a provided in the slider 2a. In the minute gap adjusting device configured as described above, first, in order to adjust the gap Δy ′ between the measuring rolls, the slider 2a which is the roll gap rough adjusting mechanism is attached to the air cylinder (not shown). The ball spline shaft 8a is rotated by advancing in the direction of arrow F by thrust, and then the separately provided rotation shaft is rotated by a high-precision reducer operated by a signal from the gap measuring device, and the side surface of the fixed base 13a is rotated. The tip surface of the ball spline shaft 8a is abutted against the abutting surface S that has been finished with high precision. Then, a voltage is applied to the heating element or the internal heating element 10a such as a piezoelectric element provided on the ball spline shaft 8a to expand it by displacement, and the slider 2a is moved by a minute amount to finely adjust the deviation from the final target value. Therefore, highly accurate positioning can be performed. The mounting position of the internal heating element is not limited to the coarse adjustment mechanism portion such as the ball spline shaft, but may be provided at a fixed portion such as a fixed base that faces the coarse adjustment mechanism portion.

〔The invention's effect〕

According to the present invention, the slider is moved back and forth by the back and forth movement of the ball spline shaft, and then a voltage is applied to the heating element or the piezoelectric element to thermally displace the slider, so that the back and forth movement of the slider can be finely adjusted. The accuracy can be dramatically improved (submicron unit) compared to. Further, since a heating element or a piezoelectric element having a large displacement amount, a high resolution, a high displacement response speed, and a large generative force is used, fine adjustment of the roll gap can be performed very easily. . Therefore, a mechanically highly accurate positioning device becomes unnecessary, and as a result, an inexpensive and compact gap adjusting device can be obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partial cross-sectional detailed view of a minute gap adjusting device between measuring rolls according to the embodiment of the present invention, and FIG. 2 is a conventional direct-acting type minute gap adjusting device between measuring rolls. It is a block diagram using the fine adjustment mechanism of the present invention. 1 ... Machine stand, 2 ... Slider, 3 ... Bracket, 4
...... Metering roll, 5 …… Coating roll,
6 ... Rotary shaft, 6a ... Ball screw shaft, 7 ... Thrust bearing, 8 ... Ball spline shaft, 9 ... Ball spline, 10 ... Heating element, 10a ... Wire, 11 ... Ball screw, 1
2 …… Nut, 13 …… Fixing stand.

Claims (1)

(57) [Claims] 1. A fine adjustment device for a gap between measuring rolls of a coating machine, which is provided with a coarse adjusting mechanism for adjusting a gap between the measuring rolls by moving a slider on which a metering roll is placed back and forth by a forward and backward movement of a ball spline shaft. In the above, a fine adjusting mechanism including a heating element or a piezoelectric element is attached to the rough adjusting mechanism, and the longitudinal movement of the slider is finely adjusted by the displacement of the heating element or the piezoelectric element. Fine adjustment device for the gap between the measuring rolls.