JPS646621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scale-side mechanism of a linear pulse motor.

Generally, a linear pulse motor moves the primary or secondary scale in steps by a certain distance (1/4 pitch for a 4-pole type) for each input pulse supplied to the primary coil. Along with this operation, linear pulse motors are being applied to office automation equipment such as head feeding of various printers and photoelectric reading devices that require accurate positioning control. The conventional configuration of this linear pulse motor is shown in FIGS. 1 and 2. That is, Fig. 1 is a partially cutaway front view, and Fig. 2 is a partially cutaway front view.
The figures are partially cutaway side views. In each figure, 1 is the primary side (usually used as a slider on the movable side) that is responsible for generating magnetic poles of the linear pulse motor, and 2 is in a magnetically shriveled state at the center of the front. iron core 2,
3. Side plates 4, 5 that fix the iron cores 2, 3 on both sides; permanent magnets 6, 7 magnetized with the polarities shown on the back of each of the iron cores 2, 3; magnetic plate 8 to be joined to the back side of
Coils 9a, 9b, 9c, 9 attached to b
d, a shaft 10 supported under both sides of each side plate 4, 5;
It consists of wheels 12 to 15 rotatably supported by a wheel 11. And each of the magnetic poles 2a, 2b, 3
Teeth portions 2a1, 2b1, 3a1, and 3b1 are formed on a and 3b with a shift of 1/4 pitch. Reference numeral 16 denotes a scale forming the secondary side of the linear pulse motor, and tooth portions 16a having the same pitch as each of the magnetic pole tooth portions 2a1 and the like are formed on a flat surface.

In the linear pulse motor shown in FIGS. 1 and 2 above, when driving, for example, by a one-phase excitation method, in the process of sequentially exciting each coil 9a to 9d, each magnetic pole 2a, 2b, 3a, 3b is The formed tooth portions 2a1, 2b1, 3a1, and 3b1 sequentially face the tooth portions of the secondary scale, thereby in principle advancing by 1/4 pitch.

By the way, the scale mechanism of the linear pulse motor having the above-mentioned conventional structure is no longer able to meet the increasing demand for noise reduction when a linear pulse motor is attached to a device and put into actual operation. That is, in the process of sequentially exciting the primary coil as described above, the scale tooth portion 16a
and each tooth portion 2a1, 2b1, 3a1, 3b on the primary side
The attraction force generated between the primary slider 1 and the scale 16 changes. This change causes the scale to vibrate and generate noise. In order to reduce this noise, the vibrations of the scale must be absorbed by some means.

This invention uses a vibration-absorbing plate made by bonding two iron plates with an adhesive called a pressure-sensitive adhesive, and a slit plate is attached to this to form a scale, which absorbs the vibrations generated in the scale. The board absorbs the noise and reduces the noise.

This invention will be specifically explained below with reference to FIG.

In the same figure, 17 and 18 are magnetic steel plates, 19
This is a vibration-absorbing adhesive called a pressure-sensitive adhesive or adhesive, and these make up the vibration-absorbing plate. 16' is a slit plate, and 16'a is a tooth portion. The slit plate may be half-etched as shown in the figure, or may have slits passing through it. 20 is an adhesive.

In the above configuration, the scale is attracted by magnetic flux from the magnetic pole teeth of the primary slider (not shown).
The release is repeated, which normally causes vibrations and noise. However, in the present invention, the scale body, which serves as the back plate of the slit plate 16', is composed of a vibration absorbing plate formed by bonding two magnetic steel plates 17 and 18 with a pressure-sensitive adhesive 19 to form a sandwich arch shape. vibrations are absorbed,
Noise is reduced. In other words, the attraction and release forces applied to the two magnetic steel plates 17 and 18 act as bending stress on each plate, and this appears as a "shear phenomenon" on the pressure-sensitive adhesive interposed between the two plates. , which generates heat and works to suppress vibration. That is, vibrations are thermally dissipated and therefore noise is also reduced.

As mentioned above, this invention allows the scale to be
Since the slit plate is bonded to the vibration absorbing plate, the vibration generated in the scale can be absorbed by the vibration absorbing plate and noise can be reduced.The simple structure of using a commercially available vibration absorbing plate has excellent effects. You can get the effect.

[Brief explanation of the drawing]

Figures 1 and 2 are a partially cutaway front view and a partially cutaway side view of the linear pulse motor, respectively.
The figure is a front view of the scale according to the present invention. 16'...Slit plate, 16'a...Tooth part, 1
7, 18...Magnetic steel plate, 19...Pressure sensitive adhesive, 20...Adhesive.

Claims (1)

[Claims] 1. A linear pulse motor scale characterized in that a slit plate for tooth formation is bonded to a vibration absorbing plate formed by bonding two magnetic steel plates with a pressure-sensitive adhesive into a sandwich arch shape. Motor scale mechanism.