JPH02160069A - Fine adjustment device for measuring roll gap of coating machine - Google Patents

Abstract

PURPOSE:To improve operability by attaching a fine adjustment mechanism consisting of a heating element or piezoelectric element to a rough adjustment mechanism and subjecting the forward and backward movements of a slider to fine adjustment. CONSTITUTION:The slider 2a is advanced in a direction F by the thrust of an air cylinder in order to adjust the gap y' between measuring rolls. A revolving shaft is then rotated by a high-precision reduction gear, by which a ball spline shaft 8a is rotated to abut the front end of the shaft 8a against the abutment surface S finished with high accuracy on the side face of a stationary rest 13a. A voltage is then impressed to an internal heating element 10a, such as heating element or piezoelectric element, internally provided in the shaft 8a to expand the element by displacement, by which the slider 2a is moved very slightly. The easy fine adjustment of the roll gap is executed in this way.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention aims to reduce the minute gap between the metering rolls of a coating machine in order to make the amount of coating agent applied to the material to be coated uniform. Relating to a device for adjustment.

(Prior Art) Managing the gap between the metering rolls of a coating machine is an essential element in the coating machine, and the accuracy of the gap management directly affects the accuracy of the coating amount.

To control the gap between the metering rolls of a conventional coating machine, a direct-acting type metering roll minute gap adjustment device and a wedge large metering roll minute gap adjustment device, which are purely mechanical methods, are used. That is, in the direct-acting metering roll minute gap gIi device, the slider on which the metering roll is installed is moved back and forth by the thrust of the air cylinder. Next, a separately provided rotary shaft is rotated by a high-precision reducer to rotate the ball screw shaft, which causes the ball spline shaft screwed with the ball screw shaft to move back and forth to finely adjust the gap between the metering rolls. . In addition, in the wedge large metering roll fine gap adjustment device, the slider on which the metering roll is installed is moved back and forth by the thrust of the air cylinder, and the gap between the metering roll support bracket and the side surface of the coating roll support bracket is adjusted. A fixed wedge and a movable wedge are sandwiched between them, and the movable wedge is 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, with such conventional direct-acting or wedge-type fine gap adjustment devices between measuring rolls, the purely mechanical 3!
It is a J adjustment device, and its drive system is composed of a combination of a high-precision reduction gear and a ball screw. Therefore,
No matter how precisely these components are manufactured, their elastic deformation due to external forces cannot be avoided1, and the current technology has a limit of fine adjustment accuracy of about 1μ.

In addition, in order to maintain this accuracy, the dimensions of the ball screw become large, which results in an increase in the size of the entire device, which not only increases the cost, but also causes problems in that the operability of the device deteriorates.

The present invention has been made in view of the above points, and uses a heating element or a piezoelectric element in the fine adjustment mechanism between the measuring rolls, and uses the minute deformation of the heating element to make fine adjustments to the submicron level. The purpose of the present invention is to provide a micro-gap adjustment device.

[Structure of the invention]

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

(Function) In the device for finely adjusting the gap between the metering rolls of the coating machine of the present invention configured as described above, first, the slider is moved back and forth by the back and forth movement of the ball spline shaft to fine-tune the gap between the metering rolls. After making the adjustment, voltage is applied to the heating element or piezoelectric element to cause a minute displacement, and this displacement allows fine adjustment of the slider's back and forth movement to eliminate minute deviations from the final target value and achieve highly accurate positioning. .

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the device for adjusting the fine gap between measuring rolls according to the embodiment of the present invention includes a slider installed on a machine base 1 via a roll bearing (not shown) so as to be slidable in the direction of an arrow. 2 and O to bracket 3 on this slider 2
It consists of a metering roll 4 which is rotatably supported around 02 on a fixed base 13 and a coating roll 5 which is rotatably supported on a fixed base 13.

In particular, metering roll 4 and coating roll 5
The coarse adjustment mechanism for the minute gap Δy between the slider 2 and the rotating shaft 6 includes a rotating shaft 6 built into the slider 2, a ball screw shaft 6a directly connected to the rotating shaft 6,
Furthermore, it consists of a ball screw 11 that is screwed together with this ball screw shaft 6a through balls. Note that this rotating shaft 6
A servo motor (not shown) with a high-precision reduction gear is directly connected to the servo motor.

Further, the ball spline shaft 8 bolted to a nut 12 integral with the ball screw 11 has a spline portion at its tip meshing with a spline of a ball spline 9 keyed to the slider 2. The ball spline shaft 8, which is thus prevented from rotating, moves forward and backward in proportion to the amount of rotation of the ball screw 11. Further, the base end portion of the ball screw shaft 6a is supported by a thrust bearing 7.

In particular, in the embodiment of the present invention, as shown in FIG.
A fine adjustment mechanism is constructed in which a heating element or piezoelectric element 10 is press-fitted into the hole, and a voltage is applied by connecting the electric wire 10a.

At this time, the piezoelectric element is a laminated piezoelectric material that expands and contracts accurately in units of 10 μm (for example, NT
K piezo stack) is used. The thickness of this element is 0,1
70 to 100 PZT disks of ~11cm are stacked to form a cylindrical shape like animal muscle fibers, and about 400
Apply a voltage of v to make it expand and contract. The expansion and contraction of the entire element is less than 1 step, but by adjusting the voltage appropriately,
In addition to being able to adjust the movement of the element with an accuracy of 1/100,000th of a millionth (submicron), it is also possible to extract approximately 70 kg of force per 1 c of cross-sectional area of the element as it expands and contracts.

In the gap adjustment mechanism configured in this way, when the servo motor with a high-precision reduction gear is pulse-rotated by the amount of command from the gap Δy measuring device, the rotating shaft 6 is rotated by the ball screw shaft 6.
By rotating the ball spline a, the ball spline shaft 8, which is threaded onto the ball spline shaft 8, is moved forward or backward by a predetermined amount. When the tip of the ball spline shaft 8 hits the highly precisely finished abutment surface S, the gap Δy between the measuring rolls is secured. Next, in the embodiment of the present invention, in order to further ensure gap accuracy on the order of submicrons, a voltage is applied to the heating element or piezoelectric element 10 embedded in the tip of the ball spline shaft 8, and this voltage is adjusted. , the heating element or piezoelectric element 10 is displaced by a force of about 70 kg/c'', and the ball spline shaft 8
is moved back and forth by a minute amount, making it possible to finely adjust the gap in submicron units.

The fine adjustment mechanism comprising the heating element or piezoelectric element of the present invention is applied to the conventional fine gap adjustment device between measuring rolls in the following manner.

First, when applying the device to a direct-acting metering roll micro-gap adjustment device, as shown in Fig. 2, a slider 2a is installed on the machine base 1a via a roll bearing or the like so that it can slide freely in the direction of the arrow. On this slider 2a, a metering roll 4a which is pivotally supported at the center 01 by a bracket 3a is attached. On the other hand, a bracket 3a' is attached to a fixed base 13a fixed to the machine base 1a, and this bracket 3a
/ Coating roll 5a pivotally supported at center 02
Install. Further, a heating element or a piezoelectric element 10a is installed at the tip of the ball spline shaft 8a installed inside the slider 2a. In the micro gap adjustment device configured in this way, first, the gap Δy′ between the measuring rolls is
In order to adjust A: A, the slider 2a, which is the roll gap rough adjustment mechanism, is moved forward in the direction of arrow F by the thrust of an air cylinder (not shown), and then a separately provided rotating shaft is moved to the gap measuring device. The ball spline shaft 8a is rotated by a high-precision reduction gear operated by a signal from the ball spline shaft 8a.
is rotated, and the tip of the ball spline shaft 8a is abutted against the highly precisely finished abutment S on the side surface of the fixed base 13a. Next, a voltage is applied to an internal heating element 10a such as a heating element or a piezoelectric element installed in the ball spline shaft 8a to cause it to expand due to displacement, and the slider 2a is moved by a minute amount to finely adjust the deviation from the final target value. This enables highly accurate positioning. Note that the internal heating element is not limited to the coarse adjustment mechanism such as the ball brine shaft, but may be mounted on a fixed part such as a fixed base facing thereto.

〔Effect of the invention〕

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 cause thermal displacement, and the back and forth movement of the slider is slightly controlled.
Since J8 can be adjusted, the accuracy can be dramatically improved (on the submicron scale) compared to conventional gap adjustment devices. Furthermore, since we use a heating element or piezoelectric element that has a large amount of displacement, high resolution, fast displacement response speed, and large generated force, it is extremely easy to fine-tune the gap between the rolls. . Therefore, a mechanically highly accurate positioning device is not required, and as a result, an inexpensive and compact gap adjusting device can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a detailed partial cross-sectional view of a measuring roll micro-gap adjusting device according to an embodiment of the present invention, and FIG. 2 is a conventional direct-acting measuring roll micro-gap adjusting device. FIG. 3 is a configuration diagram using the fine adjustment mechanism of the present invention. DESCRIPTION OF SYMBOLS 1... Machine base, 2... Slider, 3... Bracket, 4... Metering roll, 5... Coating roll, 6... Rotating shaft, 6a... Ball screw shaft,
7... Thrust bearing, 8... Ball spline shaft,
9... Ball spline, 10... Heating element, 10a
...Electric wire, 11...Ball screw, 12...Nut, 13...Fixing stand.

Claims (1)

[Claims] A fine adjustment device for the gap between metering rolls of a coating machine is equipped with a coarse adjustment mechanism that adjusts the gap between the metering rolls by moving a slider on which a metering roll is mounted back and forth by the back and forth movement of a ball spline shaft. A gap between metering rolls of a coating machine, characterized in that a fine adjustment mechanism made of a piezoelectric element is attached to the coarse adjustment mechanism, and the longitudinal movement of the slider is finely adjusted by displacement of the heating element or the piezoelectric element. Fine adjustment device.