JPH0735845B2 - Balancer for rotating body and method for obtaining rotational balance - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sheet piece balancer for obtaining balance during rotation of a rotating body, and a method for obtaining balance of the rotating body using this balancer.

(Prior Art) There are two methods for obtaining the movement balance of a rotating body, that is, a method of scraping off the material of a heavy portion that is out of balance and a method of adding mass to a light portion that is out of balance. Of these, the former is difficult to dispose of chips, so it is not applied to precision members or rotating bodies that correct unbalance after assembly, and the latter method is often adopted. .

The procedure for adding mass is to form an unbalance correction groove that is concentric with the rotating shaft in advance on the rotating body, and use the balancing measuring instrument to detect the unbalanced area with a low mass distribution and bond it to that area. The corrective weight is added.

However, this method has a problem that it takes 2 to 6 hours to obtain a good adhesion state, depending on the adhesive agent, and it takes a long time to confirm the balance state after correction.

Particularly, when the rotating body is a polygon mirror and the size of the polygon mirror 4 provided with the unbalance correction groove 2 is larger than the diameter of the rotor 6 of the motor as shown in FIG. The weight of the mirror 4 has a non-negligible relationship with the weight of the rotor 6. For this reason, even if the unbalance of the motor is already corrected, it is necessary to correct the unbalance due to misalignment or the like after the polygon mirror 4 is attached to the motor. When performing the above method and procedure for this correction, it is necessary to pay attention to the high-speed rotation characteristic of the polygon mirror 4 and wait for confirmation work of the corrected balance state until the correction weight is completely bonded. If this is done in an incompletely bonded state, the correction weights will scatter and stain the mirror surface 8 and other problems, so it will eventually take a long time to correct the imbalance. .

(Objective) Accordingly, an object of the present invention is to provide an improved rotary body capable of shortening a dynamic unbalance correction work time for a rotary body including a rotor of a motor and a polygon mirror integrally assembled with the rotor. Balancer and a method for obtaining rotational balance using the balancer.

(Structure) In order to achieve the above object, the present invention attaches a balancer for correcting the unbalance of the rotating body to a flat portion exposed to the outside of the rotating body with a total thickness of 0.05 to 0.15 mm. A sheet piece having a double-sided pressure-sensitive adhesive tape and a non-hygroscopic layer provided on one surface of the double-sided pressure-sensitive adhesive tape layer, and this balancer has an actual distribution mass of the rotor in order to obtain the balance of the rotor. It is characterized in that it is attached to a flat surface at a portion lower than the required mass sentence distribution to obtain the balance of the rotating body.

Hereinafter, a specific description will be given based on an embodiment of the present invention.

A polygon scanner unit is shown in FIGS. 1 and 2 as an example of a rotating body suitable for carrying out the present invention. In the figure, reference numeral 10 indicates a stator of a DC brushless motor, and reference numeral 12 indicates a rotor. A polygon mirror 14 is fixed to the rotor 12 by using a wave washer 16 for mirror pressing, a mirror pressing 18, a snap ring 20 for mirror pressing, and the like.

In such a configuration, the polygon mirror 14 is assembled after the motor unit is assembled. However, in this assembly, the disturbance of the balance is caused by the misalignment, and therefore it is necessary to correct the disturbance of the balance of the polygon mirror. Occurs. In correcting this imbalance, in this example, a disc-shaped sheet piece as indicated by reference numeral 22 in FIGS. 1 to 3 is used as a balancer. The balancer 22 has its diameter and thickness appropriately set according to the state of the portion to which it is to be attached and the correction amount.

In this example, the part to which the balancer is added is the flat part of the upper surface of the polygon mirror for ease of installation, and the part with a mass distribution lower than the mass distribution required to obtain the dynamic balance of the rotating body is detected by the balance measuring device. Then, the balancer 22 set to the required weight and shape is attached to the corresponding portion. The thickness of the balancer 22 is set as thin as 0.05 to 0.1 mm in order to reduce air resistance as much as possible during high-speed rotation (10,000 rpm or more) of the polygon mirror, and to prevent mass change due to moisture absorption, A non-hygroscopic material is used. FIG. 4 shows a specific configuration example of the balancer 22. In this example, a second layer 26 having a thickness of about 25 μm is attached to a first layer 24 having a thickness of about 50 μm, which is obtained by subjecting a polyester film to aluminum vapor deposition, and a printerac C (trade name, Nitto Denko).
A double-sided adhesive tape 28 is attached below the first layer 24. The configuration of this example is suitable for implementation in that it has both appropriate mass properties and non-hygroscopic properties.

When carried out as in the above example, the balancer weighs no more than 100 mgf and is firmly adhered to the material immediately by the double-sided adhesive tape, and it does not break or scatter during rotation, so the mirror surface is not soiled. The time required for the unbalance correction work can be significantly reduced. In this way, the balancer 22 can be easily attached to any flat surface of the polygon mirror, and can be easily peeled off so that it can be re-corrected even if there is some balance deviation, and it is a sheet piece, so it is not damaged. It doesn't have to be small. Further, as compared with the prior art, it is not necessary to form the groove of the unbalance correction instep, so that the processing cost of the polygon mirror is reduced accordingly.

In addition to the above examples, the material may be copper, brass, aluminum, polyethylene, polystyrene, polyester, or the like. An adhesive, an initial adhesive, a heat-curable adhesive, or the like may be used as an adhesive means when a plurality of kinds of materials are attached to each other or when attached to a rotating body. When the object to be attached is a transparent body, it can be post-cured by using an initial adhesive UV-curable adhesive.

The shape of the balancer 22 is not limited to the circular shape, but may be an elliptical shape, a polygonal shape such as a quadrangle or a hexagon to increase the material usage rate.

When a circular balancer is used, for example, 3 to 5 types of balancers having different diameters (weight, thickness) are prepared, and the balancer is denoted by reference numeral 5 or 6 in FIG. As indicated by 221,222, by stacking, arranging and adhering them side by side, it is possible to give a change and width to the balance adjustment.

(Effect) According to the present invention, the time required for correcting the imbalance of the rotating body can be greatly shortened as compared with the conventional one due to the simple attachment of the balancer, and the balancer has the non-hygroscopic layer. Therefore, mass change due to moisture absorption is prevented,
It is convenient.

[Brief description of drawings]

1, 5 and 6 are plan views for explaining the case where the present invention is applied to a polygon scanner which is a rotating body, FIG. 2 is a sectional view corresponding to FIG. 1 of the above, and FIG. 3 is a balancer. FIG. 4 is a perspective view of the principal part of FIG.
The figure is a cross-sectional view of a polygon scanner for explaining a conventional technique. 22,221,222 …… Balancer.

Claims (2)

[Claims] 1. A total thickness of 0.05 to 0.15 to be attached to a flat portion exposed to the outside of the polygon mirror in order to obtain a balance between a rotor of a motor and a rotating body composed of a polygon mirror integrally assembled with the rotor. A balancer for a rotating body, which is a sheet piece of mm and has a double-sided adhesive tape layer and a non-hygroscopic layer provided on one surface of the double-sided adhesive tape layer. 2. A rotor having a rotor of a motor and a polygon mirror integrally assembled with the rotor, in which the actual mass distribution is lower than the mass distribution required for obtaining dynamic balance of the rotor. The thickness of the flat surface is 0.
It is a sheet piece for mass correction of 05 to 0.15 mm, wherein a balancer having a double-sided adhesive tape layer and a non-hygroscopic layer provided on one surface of the double-sided adhesive tape layer is attached to obtain a balance of the rotating body. How to get rotation balance.