JPH0347298A - Washing machine - Google Patents

Abstract

PURPOSE:To prevent the shell of a motor from the accumulation of static electricity thereon by connecting electrically the shell of the drive motor to a mechanism section through a resistor having a high resistance value. CONSTITUTION:A resistor 25 having a high resistance value compared with a normal conductor is formed in the proximal end 25a with a hole 25b, while being formed with a slit 25d extending from the proximal end 25a to the distal end 25c and opened at the end face of the distal end 25c. The resistor 25 thus formed is secured fixedly to a bracket 13a of a drive motor 12 by threading a screw 26 inserted into the hole 25b in a threaded hole 13d formed in said bracket 13a, while being connected electrically thereto so that the distal end 25c elastically makes contact with the outer peripheral surface of a mechanism section 7 under the upward bending state. Thus, the shell of the drive motor 12 is prevented from the accumulation of static elasticity thereon and the manhours of resistor 25 mounting operation are reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a washing machine that uses a belt transmission mechanism to transmit the rotation of a drive motor to a mechanical part that drives washing members such as stirring blades. Regarding machines.

(Prior art) In a dehydrating and dehydrating washing machine, a rotating tub serving as a washing member is disposed within a synthetic resin water receiving tank that is elastically suspended from an outer box. A stirring blade as a washing member is also provided, and a metal support is attached to the outer bottom of the water receiving tank, and a mechanism part for selectively driving the rotating tank and the stirring blade is attached to this support. It has a hanging configuration.

A drive motor, which is a drive source, is mounted hanging down on the support body through a spacer member so as to be electrically insulated from the support body.Furthermore, a drive pulley is attached to the rotation shaft of the drive motor, and the mechanism part is A driven pulley made of synthetic resin such as nylon 6 containing glass fiber is attached to the drive shaft, and a belt made of synthetic rubber such as SBR or neoprene rubber is passed between the driving pulley and the driven pulley.
It constitutes a belt transmission mechanism. In such a configuration, a control device consisting of a microcomputer is installed in the operating section of the outer box, and this control device rotates the stirring blades during washing and rinsing via a drive motor and a belt transmission mechanism. During dewatering, the rotary tank is controlled to rotate.

According to the configuration described above, when the ambient humidity is low, the moisture content of the belt decreases significantly due to frictional heat between the belt and the driving pulley and the driven pulley, resulting in an extremely high resistance value (for example, several hundreds of MΩ). ~ several thousand MΩ). Therefore, for example, during dehydration, the driven pulley operates at high speed (approximately 900 MΩ).
r, p, m), static electricity is generated due to friction between the insulating synthetic resin driven pulley and the synthetic rubber belt, and this static electricity is electrically insulated from the support. It becomes accumulated on the outer shell of the drive motor.

When the amount of static electricity accumulated in the outer shell increases, this accumulated charge flows to the control device electrically connected to the motor coil of the drive motor via the motor coil, causing the There is a problem that adversely affects the parts.

In order to solve this problem, conventional methods have been considered, such as the one disclosed in Japanese Patent Application Laid-open No. 63-147497. That is, at the spacer part +4 for attaching the outer shell of the drive motor to the support body in an electrically insulated state, a clamp is inserted between both terminals or the spacer member, the support body, and the outer shell. , °f, and then electrically connect between the outer shell of the drive motor and the mechanical part by the resistor through the supporting body (1).
It was completed.

According to such a conventional configuration, even if the mechanical part and the outer shell of the drive motor are charged positively and negatively, since the groove part and the outer shell are electrically connected by the resistor, the electrical charges are positive and negative. Negative static electricity is neutralized and, as a result, build-up of static electricity on the outer shell of the drive motor is prevented.

(Problems to be Solved by the Invention) In the conventional configuration described above, it is difficult to assemble both terminals of the resistor by inserting them into the spacer member, and the mounting condition is not reliable. Therefore, in reality, the seventh
As shown in the figure, both terminals 102, 10 of the resistor 1 ()]
A connecting terminal 103° 103 is crimped and fixed to 2, and one of the connecting terminals 103 is fixed to the outer shell of the drive motor with a screw.
The other connecting end 7-103 is screwed to the support.

However, with this kind of tR configuration, low antibody 10
Both terminals 102, 1021. : Connection terminal 103.10
Work to fix correct/incorrect 3 respectively and connection terminal 103.103
It is necessary to fix the drive motor to the outer shell of the drive motor and to the support body with screws, which increases the number of installation steps and increases the cost.

In addition, recently, in order to make washing machines quieter, the spacer member interposed between the outer shell of the drive motor and the support body is made of an elastic material such as rubber, so that the vibrations of the drive motor are supported. It has been considered to create a configuration in which the vibrations are not transmitted to the body, but in such a case, the vibrations of the drive motor and the support body will be different, so the resistor 101 connected between them will be There is a problem that the resistor 101 may be damaged due to vibration.

The present invention has been made in view of the above circumstances, and its 1j purpose is not only to reliably prevent the accumulation of static electricity on the outer shell of the drive motor, but also to reduce the number of work required to install the resistor. Therefore, we would like to create a washing machine that can be manufactured at low cost and that can prevent damage to the resistor due to vibration.

[Structure of the Invention] (Means for Solving the Problems) The washing machine of the present invention has a driven pulley attached to the drive shaft of a mechanism section that drives a washing member, and the mechanism section is connected to an electrically insulated drive pulley. A drive pulley is attached to the rotating shaft of the motor, and a belt is passed between the drive pulley and the driven pulley.
Furthermore, a control device for controlling the drive motor is provided, and the outer shell of the drive motor and the mechanism section are electrically connected to each other, and one of the two connection parts is connected by an elastic contact with a high resistance. The feature is H in the configuration in which a resistor made of a flexible sheet with a value of H is provided.

(Function) According to the washing machine of the present invention, even if static electricity is generated due to the friction between the belt and the drive pulley or the driven pulley and the outer shell of the machine 4M and the drive motor are positively and negatively charged, the Since the mechanical part and the outer shell are electrically connected by a resistor having a high resistance value H, positive and negative static electricity is neutralized, and as a result, no static electricity is accumulated in the outer shell of the drive motor. Furthermore, since the resistor is formed from a flexible sheet and one of the two connection parts is connected by elastic contact, the number of resistor elements to be installed is reduced compared to the conventional method using connection terminals. Become. Furthermore, as mentioned above, since one of the connecting parts of the resistor is connected by elastic contact, vibrations can be absorbed by the connecting part by elastic contact, and excessive vibrations are not applied to the resistor. There isn't.

(Embodiment) An embodiment of the present invention will now be described with reference to FIGS. 1 to 6.

First, the general structure of the dehydrating and washing machine will be described according to FIG. Reference numeral 1 denotes a metal outer box, inside of which a synthetic resin water tank 2 is elastically suspended by an elastic suspension mechanism 3. In the water receiving tank 2, there is arranged a washing machine 16 as a washing member, and a rotating tank 4, which is a dehydrating tank, and at the bottom of the rotating tank 4, a stirring blade 5, which is a washing member, is arranged. Reference numeral 6 denotes a metal support mounted and supported on the outer bottom of the water receiving tank 2. Reference numeral 7 denotes a metal mechanical section mounted and supported by this support 6, whose dewatering shaft 8 is connected to the rotating tank 4, and whose washing shaft 9 is connected to the stirring blade 5. Further, a driven pulley 11 made of a synthetic resin such as glass-filled 6-nylon is attached to the drive shaft 10 of the mechanism section 7 by fitting. In this case, the rotation of the drive shaft 10 is transmitted to the stirring blade 5 via the washing rack 9 during washing and rinsing, and is transmitted to the rotating tank 4 via the dewatering shaft 8 during dehydration. Reference numeral 12 denotes a drive motor having an outer shell 13, which is suspended from the support body 6 as will be described later. A metal drive pulley 15 is attached to the rotation shaft 14 of the drive motor 12 by fitting, and the drive pulley 15 and the driven pulley 11 are connected to each other by an SBR.
, a belt 16 made of synthetic rubber such as neoprene rubber is passed over the belt, thereby forming a belt transmission mechanism 17. In addition, 18 is an operation part provided at the rear upper part of the 4 seedlings 1,
This is provided with one control device consisting of a microcomputer for controlling the load including the drive motor 12 to execute the washing operation.

Now, with reference to FIG. 2, the mounting structure of the drive motor 12, which serves as the drive source of the mechanism section 7, to the support body 6 will be described. Bracket 1 that is part of outer shell 13 in drive motor 12
A plurality of mounting legs 13b are formed in 3a, and holes 13c are formed in the mounting legs 13b. Further, L-shaped support portions 6a are protruded from the lower surface of the support body 6 in correspondence with the mounting legs 13b, respectively, and a hole portion 6c is formed in the horizontal portion 6b. Reference numeral 20 denotes a spacer member, which is formed into a short cylindrical shape and made of a material having insulation and elasticity, such as rubber. 21 and 22 are bolts that connect the large-diameter flanges 21a and 22a, respectively. a and 22a are firmly adhered to the upper and lower end surfaces of the spacer member 20. This spacer member 20 is arranged between the support leg 13b of the bracket 13a and the water hole part 6b of the support part 6a, and the bolts 21 and 22 at the upper and lower ends are connected to the holes 13c and 6C.
The bolts 21 and 22 are threaded with nuts 23 and 24, respectively, so that the drive motor 12 is mounted on the support 6 in an electrically insulated manner from this. ing.

i/ii L, 25 is a resistor, which will be described below with reference to FIGS. 1 and 3 to 5.

That is, this resistor 25 has a resistance value of several MΩ to several tens of MΩ (higher resistance value than a normal conductor), and is made of a conductive material such as carbon, which is a flexible sheet with a high resistance value of 6. It is formed by punching out a mixed conductive plastic sheet (for example, Ebilon CM - manufactured by Taihei Chemical Products Co., Ltd.) into a rectangular shape (see FIG. 5). The resistor 25 has a hole 25b formed at its base end 25a, and a slit extending from the base end 25a toward the tip 25C and opening at the end surface of the tip 25c. 2
5d is formed. Resistor 2 formed in this way
5 connects the screw 26 inserted into the hole 25b to the drive motor 1.
By screwing into the screw hole 13d formed in the bracket 13a of No. 2, it is fixed to the bracket 13a and electrically connected, and as a result, the tip portion 25C is curved upward and the mechanism It comes into elastic contact with the outer peripheral surface of the portion 7 and is electrically connected (see Figs. 1 and 3).
(see figure). In this case, the tip 25 of the resistor 25 is divided into two by the slit 25d and has more flexibility, so that when it comes into contact with the arcuate outer peripheral surface of the mechanism section 7, the contact portion of the tip 25c comes to follow the arc-shaped outer peripheral surface (see Fig. 4).

Next, the operation of this embodiment will be explained with reference to FIG. 6. The rotation of the rotating shaft 14 of the drive motor 12 is controlled by the belt transmission mechanism 17 by the washing operation under the control of the control device 19.
If static electricity is generated due to friction between the synthetic rubber belt 16 and the synthetic resin driven pulley 11 when static electricity is transmitted to the drive shaft 10 of the mechanism section 7 via As shown in FIG. Since they are electrically connected through the resistor 25, the positive and negative static electricity is increased by +11, and as a result, no static electricity is accumulated in either the machine tR section 7 or the outer shell 13. It turns out. In both connection parts A and B of the hypoantibody 25 shown in FIG. Since the connection is made by elastic contact with the outer circumferential surface of the mechanism part 7 of 25C, even if the vibration between the drive motor 12 and the mechanism part 7 becomes different due to the vibration absorption effect of the spacer member 20,
The difference in vibration is absorbed by the distal end portion 25C at the connecting portion B through elastic deformation or sliding displacement in accordance with the movement of the mechanism portion 7.

According to this embodiment, the following effects can be obtained. That is, since the outer shell 13 of the drive motor 12 and the mechanism part 7 are electrically connected by the resistor 25 having a high resistance value, the metal belt 16 and the driven pulley 1 are connected electrically.
Even if the mechanism part 7 side is positively charged and the outer shell 13 side is negatively charged due to static electricity generated by friction with 1, these are neutralized through the resistor 25. As a result, the outer shell of the drive motor 12 This can reliably prevent static electricity from accumulating on the 13. Therefore, belt 1
Static electricity caused by friction between the drive motor 6 and the driven pulley 11 does not adversely affect the electronic components of the control device connected to the motor coils 12a, 12b of the drive motor 12 (see FIG. 6). In addition, since the resistor 25 is manufactured by punching a rectangular shape from a flexible plastic sheet mixed with a conductive material, it is different from the conventional resistor 1.
It is easier to manufacture than 01. Furthermore, in both the connecting portions A and B of the resistor 25, the connecting portion A is fixed to the bracket 13a with a screw 26, but the connecting portion B
Since the connection is made by elastic contact of the distal end portion 25c with the mechanism portion 7, unlike the conventional case, the connection terminals 103, 103
It is not necessary to fix the connection terminals T-1113, 103 to both terminals 102, 102 of the resistor]01, and there is no need to fix the
There is no need to work on fixing the resistor 25.
It is possible to reduce the number of installation operations, and it can be manufactured at low cost. Moreover, one of the connecting portions A and B in the resistor 25, as described above, is connected by the tip portion 25c coming into elastic contact with the outer circumferential surface of the machine 111 part 7. The difference in vibration between the drive motor 12 and the mechanism part 7 can be absorbed by the
5 or no damage. Since the resistor 25 is formed with a sulin l-25d, the tip portion 25C can be made more flexible, and therefore the mechanism portion 7
Even if the outer circumferential surface of the mechanism part 7 has an arcuate shape, the contact portion of the tip portion 25c follows the outer circumferential surface of the mechanism part 7, resulting in good contact.

By the way, in the belt transmission mechanism 17, the driven pulley 1
1. It is conceivable that the above-mentioned problems caused by static electricity could be solved by making the drive pulley 15 and the belt 16 all metal, but using a special metal belt causes a new problem that it becomes extremely expensive. arise. On the other hand, according to this embodiment, it is sufficient to simply provide the resistor 25 having a high resistance value, so that it can be implemented at low cost.

In addition, in a washing machine with dehydrating and dehydrating functions, it has been considered to connect the support 6 to the outer box with a lead wire, but with such a configuration, if you forget to connect the outer box 1, the mechanical part The static electricity charged on 7 will reach the outer box 1, so the outer box 1
If the user touches it, they will feel an electric shock. However, according to this case, as mentioned above, the money making mechanism section 7
Even if the outer shell 13 is positively and negatively charged due to static electricity, this is neutralized by the resistor 25 having a high resistance value. Even if the user forgets to connect the outer box 1 to the ground, the user will not feel an electric shock due to static electricity when touching the outer box 1.

Furthermore, as described above, the driven pulley 11 of the belt transmission mechanism 17. Considering the case where the drive pulley 15 and belt 16 are all made of metal and the spout support 6 is connected to the outer box 1 via a lead wire, the motor coil 12a or 12b of the drive motor 12 or the outer shell. When a leakage occurs due to a layer short circuit in the outer shell 13. Belt transmitter t & 17 machine f + n section 7. There is a problem that the liquid flows into the outer box 1 via the support body 6 and the lead wire. However, according to this embodiment, even if the support 11 body 6 is connected to the outer box 1 via the lead wire, the driven pulley 11 is made of synthetic resin and has four shells 13 and the support 1! Resistor 2 connected to j body 6
5 is set to a high resistance value of several MΩ to several tens of MΩ, even if the above-mentioned leakage occurs in the temporary drive motor 12, no current that is felt by the human body will flow through the outer box 1. It is.

In the above embodiment, the base end 25a of the resistor 25 is fixed to the outer shell 13 of the drive motor 12 with screws.
Alternatively, the base end 25a of the resistor 25 may be screwed and fixed to the mechanism section 7 or the support 6 electrically connected thereto, and the distal end 25c may be brought into elastic contact with the outer shell 13. Therefore, the rib h25d may be formed as necessary.

Further, in the above embodiment, the driven pulley 11 is made of synthetic resin, but the driving pulley 15 may also be made of synthetic resin.
In short, at least one of the driven pulley 11 and the drive boob J15 may be made of synthetic resin.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the present invention is not limited to the embodiments described above and shown in the drawings. It goes without saying that the present invention may be modified and implemented as appropriate without departing from the spirit of the invention, such as by applying it to all machines.

[Effects of the Invention] As explained above, in the washing machine of the present invention, the mechanical part and the outer shell of the drive motor are electrically connected by a resistor having a high resistance value, so that the outer shell of the drive motor is electrically connected to the outer shell of the drive motor. It is possible to reliably prevent static electricity from being accumulated in Since one of the two is connected by elastic contact, it is possible to reduce the number of man-hours required for installing the resistor, and it can be manufactured at low cost. This has the excellent effect of preventing the resistor from being damaged.

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the whole, FIG. 2 is a longitudinal sectional view of the spacer portion, FIG. 3 is a longitudinal sectional view of the main part, Figure 4 is the same bottom view, Figure 5
FIG. 6 is a plan view of a low antibody, FIG. 6 is an explanatory diagram of its operation, and FIG. 7 is a plan view of a conventional resistor. In the drawings, 1 is an outer box, 2 is a water tank, 4 is a rotating tank (washing member), 5 is a stirring blade (washing member), 6 is a support, 7 is a mechanism, 10 is a drive shaft, and 11 is a driven pulley. , 12 is a drive motor, 13 is an outer shell, 13a is a bracket, 1 is a rotating shaft, 5 is a drive boley, 6 is a heald, 7 is a belt transmission mechanism, is a control device, 5 is a resistor, 6 is a screw show.

Claims (1)

[Claims] 1. A mechanism unit that drives a washing member, a drive motor that is electrically insulated from the mechanism unit and serves as a drive source for the mechanism unit, and a drive pulley attached to the rotation shaft of the drive motor; A driven pulley attached to a drive shaft of the mechanism section, a belt stretched around these drive pulleys and the driven pulley, a control device for controlling the drive motor, an outer shell of the drive motor, and the mechanism section. 1. A washing machine comprising a resistor made of a flexible sheet having a high resistance value and having one of the two connecting portions connected by elastic contact.