JPH0584145B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a secondary scale mechanism of a linear pulse motor that performs linear reciprocating motion.

[Prior art]

Linear pulse motors operate in steps (visually continuous operation) on the movable side (usually the primary side magnetic flux generation part).
It is used for moving parts such as printer heads and numerically controlled machine tools because it allows accurate positioning control according to input pulses using open-loop control.

Figures 3 and 4 are a side view and a front view, respectively, showing the configuration of a conventional linear pulse motor. In each figure, 1 is a scale (usually on the fixed side), and the board 1
A slit plate 1b having teeth formed on the surface that guides the primary side movable element (described later) is adhered, and a viscous adhesive layer 1c is attached to the surface opposite to the movable element guiding surface to form a noise prevention backing plate. 1d is joined. Reference numeral 2 designates a primary side mover, which includes a core 2a forming a plurality of magnetic poles 2a1 to 2a4, permanent magnets 2b1 and 2b2, and excitation coils 2c1 to 2c1 provided for each of the magnetic poles 2a1 to 2a4.
2c4 Non-magnetic material 2d for blocking passage of magnetic flux, back plate 2e, and bearings 2f1, 2f2
Configure as shown.

In the above configuration, the combination of the magnetic flux generated by one-phase or two-phase excitation applied to each coil 2c1 to 2c4 and the magnetic flux from the permanent magnet causes the magnetic poles, the teeth of each of the coils 2a1 to 2a4, and the tooth of the slit plate 1b to The relative position of the robot is changed to perform a stepping motion at a constant pitch.

[Problem that the invention seeks to solve]

By the way, the above-mentioned linear pulse motor has a strong magnetic attraction force every step, which causes a kind of vibration effect and causes noise. are sequentially laminated on the surface of the scale substrate 1a opposite to the primary side as the mover.

However, the noise caused by the vibrations mentioned above is subject to certain standards (standards that determine the permissible range applied to printers, etc.).
In order to achieve the following, it is necessary to increase the rigidity of the scale and reduce vibrations caused by magnetic attraction. For this reason, it is forced to increase the thickness of the scale substrate 1a, and the total thickness of the scale including the adhesive layer 1c and the backing plate 1d, which have viscosity as an element to further reduce noise, becomes large. It may not be possible to comply with the installation permissible dimensions of the applicable product. Another problem is that the weight of the scale increases and the amount of material increases.

In view of the above, it is an object of the present invention to provide a means for increasing the noise level when driving a linear pulse motor even when the thickness of the scale substrate is reduced.

[Means to solve the problem]

In this invention, a contact plate is bonded to the anti-slider surface of a scale board for a linear pulse motor via an adhesive material, and one or more plates are attached to both sides of the scale board for a linear pulse motor opposite to the primary side, and to the surface not facing the primary side. It is characterized by providing a plurality of protrusions.

[Effect]

The above-mentioned protrusions strengthen the rigidity of the scale substrate and suppress the thickness of the slit substrate to keep the noise level below a certain level, thereby suppressing the overall height of the linear pulse motor. On the other hand, between the scale substrate and the plate, the adhesive material interposed between them repeats shear and deformation based on these interactions, and based on this shear and deformation, thermal energy is dissipated, and the corresponding vibration energy is reduced. Aims to reduce noise during linear pulse motor operation.

〔Example〕

The illustrated embodiment will be specifically described below. FIG. 1 is a sectional view of a scale for a linear pulse motor showing the most preferred embodiment of the present invention, and in the figure, 11 indicates the entire scale for a linear pulse motor. Reference numeral 12 denotes a scale substrate, which has protrusions 12a and 12b formed downward on both sides, and has a U-shaped cross section as a whole. Reference numeral 13 denotes a slit plate, which is bonded to the upper surface of the scale substrate 12 facing a primary side magnetic flux generation section (not shown). Reference numeral 14 denotes a backing plate, which is a convex strip 1 of the scale substrate 12.
It is attached via double-sided adhesive tape 15 in the recess between 2a and 12b.

In the above configuration, the scale substrate 12 is subjected to a strong vibration effect due to intermittent magnetic attraction from a magnetic flux generating section (not shown). At this time, the scale substrate 12 has increased rigidity due to the presence of the protrusions 12a and 12b on both sides, and vibrations caused by the magnetic attraction force are attenuated. In addition, the noise level is reduced due to the vibration absorption effect of the double-sided adhesive tape and the backing plate (based on the dissipation of thermal energy caused by repeated displacement and deformation of the adhesive material contained in the adhesive tape).

FIG. 2 shows a second embodiment of the invention,
Convex strips 12a', 1 of scale substrate 12' having a U-shaped cross section
2b' is formed on the primary side magnetic flux generation part side. That is, the slit plate 13' has protrusions on both sides. Then, a backing plate 1 is attached to the surface of the scale substrate 12' opposite to the slit plate via a double-sided adhesive tape 15'.
4' is glued.

The embodiment shown in FIGS. 1 and 2 above shows a mechanism in which protrusions are provided on both sides of the scale substrates 12, 12'; however, the protrusions are formed at the substrates 12, 12'. Both sides of the surface facing the primary side of
Any anti-primary side surface may be used, and the number thereof may be determined arbitrarily. However, when providing a convex strip at the center of the non-primary side surface, it is necessary to divide the viscous adhesive layer (double-sided adhesive tape) and the backing plate into two in the longitudinal direction. Further, the double-sided adhesive tape of the embodiment may be any adhesive layer that has viscosity, such as an adhesive that can maintain viscosity.

On the other hand, the slit plates 13, 13' can be omitted by forming the teeth on the surface facing the primary side of the scale substrate.

〔effect〕

As described above, the scale mechanism of the linear pulse motor according to the present invention has one or more protrusions on the portion of the scale substrate other than the primary side facing portion (both sides of the scale substrate facing the primary side or the opposite surface opposite to the primary side). By providing this, the rigidity of the scale substrate increases due to the presence of the protruding stripes, and the thickness of the scale substrate can be reduced in order to obtain a certain level of rigidity. Therefore,
The total height of the entire linear pulse motor including the primary side can be reduced, which can be expected to expand the range of applications of linear pulse motors, reduce the number of scale components, and adhere to the anti-slider surface of the scale. The configuration in which the contact plate is applied through the material has the feature that it is possible to reduce noise during operation of the linear pulse motor.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of a scale for a linear pulse motor showing an embodiment of the present invention, and FIGS. 3 and 4 are a side view and a front view, respectively, of a linear pulse motor having a conventional scale mechanism. . 12... Scale substrate, 12d, 12b... Convex stripes, 14... Backing plate, 15... Adhesive layer with viscosity (double-sided adhesive tape).

Claims (1)

[Claims] 1 Along the longitudinal direction of the scale at both ends of the scale board of the linear pulse motor across the teeth of the primary side facing surface and at least one place on the non-primary side facing surface.
or a linear pulse motor, characterized in that a plurality of protrusions are provided, and a contact plate is provided via a viscous adhesive layer to the opposite surface of the scale substrate opposite to the primary side excluding the protrusions. scale mechanism.