JPS62213941A - Feeder with viscous resistance applying device - Google Patents

Abstract

PURPOSE:To enable most suitable viscous resistance to be applied in all the ranges of the sliding speed of a slide bed, by providing a generator which is fixed to a fixed bed and a field current controller which detects the rotation speed of the generator and gives field currents for the generator. CONSTITUTION:Electric signals representing the rotation speed of a servo motor 3 are supplied to a field current value computing portion 11, by a speed detector 9 which is mounted to the servo motor 3 and a rotation number detecting portion 10 which converts the output signals of the speed detector 9 into electric signals representing the rotation number of the servo motor 3. The sliding speed of a slide bed 1 and the rotation number of a generator 7 are calculated by information which represents the rotation number of the shaft 4 of a feed screw and the teeth number of a pinion 6 and the like. A field current value generating necessary and most suitable viscous resistance which is given in advance for the rotation speed of the generator 7 is calculated by the field current value computing portion 11. Field currents are generated by a control portion 12 and supplied to the field current coil 13 of the generator 7, so that most suitable viscous resistance is generated in the generator 7 having load 14.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a feeding device with a viscous resistance device, and is useful when applied to devices having a sliding table, such as a sliding table or a gantry.

<Prior Art> Conventionally, in a feeding device that moves a sliding table on a fixed base using a servo mechanism such as NC control or copying control, the rotation of a drive means fixed to the fixed base, such as a servo motor, is transferred to a power transmission mechanism, For example, it is widely used to convert linear movement of a slide table on a fixed table using a feed shaft attached to a servo motor and a feed nut screwed onto the feed nut and fixed to the slide table.

<Problems to be Solved by the Invention> The feed screw shaft and feed NAND mechanism used in the power transmission mechanism of such a feed device may slide due to factors such as minute vibrations due to friction on the contact surface and irregular sliding. There was a drawback that smooth feeding motion of the moving table could not be obtained.

The present invention was made in view of the drawbacks of the prior art, and it is an object of the present invention to provide a feeding device with a viscous resistance device that can smoothly move a sliding base on a fixed base.

<Means for Solving the Problems> The configuration of the feeding device with a viscous resistance device according to the present invention that achieves the above object includes a sliding table that is moved on a fixed table by a driving means, and a sliding table that is fixed to the fixed foot table. a generator, an interlocking mechanism that converts movement of the sliding table into rotation of the generator, and detects the rotational speed of the generator and generates a predetermined field current in accordance with the detected rotational speed. The present invention is characterized in that it comprises a field current control device that supplies the above-mentioned generator 11.

<Operation/Use> According to the present invention having the above configuration, the field current of the generator is controlled by the field current control device so that the viscous resistance of the generator becomes an optimal value corresponding to the moving speed of the sliding table. controlled.

<Example> An example of a feeding device with a viscous resistance device according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of what is shown in FIG. FIG. 3 is a block diagram of the field current control device.

In FIGS. 1 to 3, a sliding table 1 of the feeding device slides on a fixed table 5 by driving a servo motor 3 fixed to the fixed table 5. As shown in FIGS. In addition, the servo motor 3 is connected to the feed screw shaft 4.
By rotating the feed screw shaft 4, the feed shaft 15, which is screwed onto the feed screw shaft 4 and fixed to the slide table 1, is linearly moved, and the slide table 1 is slid on the fixed table 5. . Further, a rank 2 is fixed to the sliding table 1 along the moving direction, and is meshed with a pinion 6 to which a rotating shaft 8 of a generator 7 fixed to the fixed table 5 is attached. Therefore, when the sliding table 1 moves on the fixed table 5, the rotating shaft 8 of the generator 7 is rotated by the interlocking mechanism consisting of the rank 2 and the pinion 6 in mesh with the rank 2. At this time, the generator 7 has
An induced electromotive force is generated depending on the magnitude of the field current, but the torque of the generator 7 generated at the same time acts on the slide table 1 as viscous resistance.

However, in the low speed range of the generator 7, the speed and torque become non-linear and appropriate viscous resistance cannot be obtained, and the optimum viscous resistance needs to be changed according to the moving speed of the sliding table 1. , the entire rotational speed range of the generator 7 is controlled by the field current control device that supplies the field current to the generator a7 that generates the required optimum torque given in advance corresponding to the rotational speed of the generator 7, that is, the optimum viscous resistance. The system automatically generates the optimum viscous resistance across the entire range.

That is, the rotation speed of the servo motor 3 is expressed by a speed detector 9 attached to the servo motor 3 and a rotation speed detection section 10 that converts the output signal of the speed detector 9 into an electrical signal representing the rotation speed of the servo motor 3. An electric signal is supplied to the field current value calculation unit 11, and the sliding speed of the slide table l and the rotation speed of the generator 7 are determined from information representing the rotation speed of the feed screw shaft 4, the number of teeth of the pinion 6, etc. A field current value calculation unit 11 calculates a field current value that generates the required optimum viscous resistance given in advance for the rotational speed of the generator 7, and a field current is generated by the control unit 12. Field coil 13
By supplying the fluid to the generator 7 with the load 14, an optimum viscous resistance is generated in the entire rotational speed range of the generator 7, and the movement of the sliding table 1 is automatically controlled.

<Effects of the Invention> According to the feeding device with a viscous resistance device according to the present invention, by simply adding a generator and a field current control device to a conventional feeding device, it is possible to achieve the optimum sliding speed over the entire sliding speed range of the sliding table of the feeding device. Viscous resistance can be added. This made it possible to obtain a feeding device with extremely good responsiveness.

[Brief explanation of drawings]

FIG. 1 is a side view showing a feeding device with a viscous resistance device according to an embodiment of the present invention, FIG. 2 is a sectional view of the device shown in FIG. 1,
FIG. 3 is a block diagram showing the field current control device. In the drawing, 1 is a sliding table, 2 is a rank, 3 is a servo motor,
4 is a feed screw shaft, 5 is a fixed base, 6 is a pinion, 7 is a generator, 8 is a rotating shaft, 9 is a speed detector, 10 is a rotation speed detection section, 11 is a field current value calculation section, 12 is a control 13 is a field coil, 14 is a load, and -15 is a pole nut.

Claims (1)

[Claims] a sliding table that moves on a fixed table by a driving means; a generator fixed to the fixed table; an interlocking mechanism that converts movement of the sliding table into rotation of a rotating shaft of the generator; A feeding device with a viscous resistance device, comprising a field current control device that detects a rotational speed and applies a predetermined field current to the generator in accordance with the detected rotational speed.