JPS59136065A - Scale mechanism of linear pulse motor - Google Patents

Abstract

PURPOSE:To reduce a noise due to vibration by mounting vibration absorbing plates made of two steel plates closely contacted through a noncurable adhesive on the back surface of a scale body formed with a toothed part in a linear pulse motor. CONSTITUTION:Wheels 12-15 are rotatably provided at shafts 10, 11 at cores 2, 3 on the back surfaces of which permanent magnets 6, 7 are respectively arranged, coils 9a-9d are respectively wound on poles 2a, 2b, 3a, 3b formed with toothed parts which are displaced by 1/4 from each other to form the primary side. Vibration absorbing plates made of two magnetic steel plates 17, 18 closely contacted with a noncurable adhesive 19 are fastened through an adhesive 19 to the back surface of a scale 16' having a toothed part 16a' of a constant pitch at the secondary side, and the primary side is moved. Accordingly, the vibration or deformation of the scale 16' occurred by the primary side magnetic flux can be effectively prevented, thereby largely reducing the noise.

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 next or secondary scale in steps by a certain distance (1/4 pitch for a 4-ball type) for each input pulse supplied to the till coil. Along with this operation, linear pulse motors have been applied to OA 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 Fig. 1 and Fig. 2 show this.In other words, Fig. 1 is a partially cutaway front view,
The figure is a partially cutaway side view. In each figure, 1 is the primary side (usually used as a movable side slider) that is responsible for generating magnetic poles of the linear pulse motor, and 2 pieces are magnetically cut off at the center of the front. iron core 2.3, and side metal plates that fix the iron core 2.3 on both sides.

5. Permanent magnets 6, 7. are magnetized with the polarities shown in the figure on the back surface of each of the iron cores 2.3. A magnetic plate 8 joined to the back surface of the permanent magnets 6, 7, and a coil 9 attached to the magnetic poles 2a, 2b, 3a, 3b formed on each of the above-mentioned iron cores 2.3.
a, 9b, 9c, 9ds Consists of wheels 12-15 rotatably supported on shafts 10.11 supported under both sides of each side plate 4,5. And each of the magnetic poles 2a,...
2b.

Teeth portions 2al, 2bl, 3al, and 3bl are formed on the teeth 3a and 3b with a 1/4 pitch and a chiseling difference. 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 2al and the like are formed on a flat surface.

In the linear pulse motor shown in FIGS. 1 and 2, when driven, for example, by the negative excitation method, each magnetic pole 2a, 2b, Teeth 2a formed at 3a, 3'o
1°2bl, 3al, and 3bl sequentially face the teeth of the secondary scale, so that in principle they advance by 1/4 pitch.

By the way, when the linear pulse motor is installed in the device and the actual operation
-In response to the increasing demand for noise reduction in
The scale mechanism of the linear callus motor with the above-mentioned conventional configuration is no longer suitable. That is, in the process of sequentially exciting the secondary coil as described above, the scale m portion 16a and each tooth oB 2al, 2bl on the primary side
, 3al, 3bl The attraction force between the primary slider and the scale 16 generated by the IC changes. This change causes the entire scale to move and generate noise.

In order to reduce this noise, the vibrations of the scale must be absorbed by some means.

For the purpose of this invention, two iron plates are bonded together with a non-curing adhesive, and the existing vibration absorption & Th
By attaching the scale to the back side of the linear pulse motor scale body with adhesive, the vibration of the linear pulse motor can be absorbed by the vibration absorbing plate, thereby reducing the noise of the linear pulse motor. This invention will be fully explained in detail. FIG. 3 is a front sectional view of the scale body of the existing linear balsmoscope mounted on a vibration absorbing plate.

16'a with scale body for 16' linear pulse monitor
is the tooth part. Reference numeral 17.18 denotes a magnetic steel plate, and these two magnetic steel plates are closely bonded together with a non-hardening adhesive 19. The vibration absorbing plate 20 is cut to an appropriate size and attached to the scale body 16' with adhesive.

With the above configuration, the scale body 16' is not shown.
The scale body 16' vibrates each time it is attracted by the magnetic flux generated from the southern part of the next slider magnetic pole. However, the vibration of this scale 16' (1) is absorbed by the vibration absorbing plate 20 to obtain the effect of reducing the noise of the linear pulse motor.

As mentioned above, by using an existing vibration absorbing plate in a linear pulse motor, the existing vibration absorbing plate can be used in an appropriate manner to absorb the vibration wJ generated from the scale body of the linear pulse motor. The noise of the linear pulse motor can be reduced by simply cutting it to size and attaching it to the scale of the linear pulse motor body using adhesive i'+l+.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway front view and a partially cutaway side view of a linear pulse smoke, respectively, and FIG. 3 is a front view of a scale according to the present invention. 16' ・φ scale body 16'a... Tooth l
'7.18...Magnetic steel plate 19...Non-hardening adhesive 20...Vibration absorbing plate applicant Shinko Electric Co., Ltd. agent Patent attorney Haruya Saito Figure 3

Claims (1)

[Claims] A linear pulse motor is a linear pulse motor in which the opposite side surface of the scale body, which forms the teeth, and a vibration absorbing plate made of two magnetic steel plates that are adhered with a non-hardening adhesive are bonded together with an adhesive. scale mechanism.