JPH0366919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the operation structure of a washing machine, and proposes an improvement in the structure of a lid switch when the operation control of the washing machine is computerized.

Conventional configurations and their problems Concerning the lid switch of a washing machine that performs electronic operation control, for example, the one proposed in Japanese Patent Application Laid-Open No. 57-131487 (Japanese Patent Application No. 16309-1982) There is an example. In the above example, one "leaf switch" is used to control OFF-ON dehydration operation by opening and closing the lid of the washer, and to detect and control the unbalanced distribution of clothes in the dehydration tank using the safety lever. It consists of a single switch with a "push-up piece" installed on the top. FIG. 1 shows the configuration of a safety switch having the structure described above. Reference numeral 1 denotes a leaf switch, which is fixed to a base 2 with screws 3. When the lid 4 is closed, the lid lever 5 is pushed up, and the unbalanced lever 6 is accordingly displaced upward, and the push-up portion 7 at the tip pushes the push-up piece 8 to push the pusher 9 of the leaf switch 1. It is turned on by raising it. The unbalanced lever 6 has pressing springs 10 and 11 inserted between the base 2 and the lid lever 5,
The lid lever 5 applies a biasing force to the base 2, and the unbalanced lever 6 applies a biasing force to the lid lever 5 in one direction.

In the conventional configuration as described above, there were problems to be solved, such as the large number of parts, which required a lot of assembly man-hours, and reliable operation could not be ensured unless the accuracy of each part was required. That is, for example, in the above example,
The operation of the unbalanced lever 6 is influenced by the lid lever 5 supported by the base 2, and since the operating lever 8 is also held by the base 2, the pusher 9
The operation of the machine is affected by the cumulative result of the dimensional variations of each part. Therefore, new adjustment work is required, such as adjusting the attachment of the leaf switch 1 to the base 2 using the screw 3, and the difference (i.e., the time difference) between abnormality detection due to opening/closing of the lid and unbalanced operation becomes large. However, it was difficult to do anything for sure.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and provides an extremely simple configuration and inexpensive method for turning on and off the energization signal by opening and closing the lid, and detecting an abnormality during unbalanced movement.

Structure of the Invention The present invention consists of a lid lever that rotates when the lid is opened and closed, and a safety lever that moves up and down due to the operation of the lid lever.
A movable body made of an electrically insulating material is rotatably supported, a step is formed on the tongue of the movable body, and the step directly pushes up substantially the tip of the movable contact piece of the lid switch, Or push it down and turn it on.
This is a configuration that obtains OFF operation.

DESCRIPTION OF EMBODIMENTS FIGS. 2 and 3 are cross-sectional views of a lid switch showing an embodiment of the present invention, and FIG. 4 is an operational diagram of a movable body part.
FIG. 5 shows an exploded perspective view.

FIG. 2 shows the washing machine with the lid 21 closed. The lid lever 24, which has a locking element 23 fixed to its tip by an operating protrusion 22 projecting rearward of the lid 21, rotates clockwise in FIG. 2 about a bearing 26 formed on the switch base 25. freely supported. The lid lever 24 can be easily processed by manufacturing it from steel wire or the like. The switch base 25 is made of an insulating plastic material, and the fixed contact piece 2
7 and the movable contact piece 28 are integrally formed. In particular, the movable contact piece 28 is made of a flexible material such as a thin copper plate or a stainless steel plate. Since FIG. 2 shows the state in which the lid 21 is closed as described above, the fixed contact piece 27 and the movable contact piece 28 are in the ON state. same
To turn on the safety lever 29, use the lid lever 24 to move the safety lever 29 upward.
At one end of the movable body 30 rotatably supported on the upper end, the tip L-shaped bent portion 2 of the movable piece 28 described above is attached.
Press 8'. The movable body 30 is partially rotatably supported by the safety lever 29, and has a slide protrusion 33 that fits loosely into an irregularly shaped hole 32 formed in the base material 31 and having an elongated dimension in the vertical direction. It is made of electrically insulating material such as synthetic resin material. The above-mentioned switch base 25 is fixed to the base material 31, and the safety lever 29 is rotatably held by a protruding piece 34 at the end of the lid 21. A pressing coil spring 37 is inserted between the protrusion 35 on the outer bottom surface of the base material 31 and the protrusion 36 of the safety lever 36, and this one coil spring 37 presses the safety lever 29 downward against the base material 31. At the same time, the clockwise rotational urging force is maintained.

When the lid 21 is opened, the lid lever 24 rotates counterclockwise around the bearing 26 and the safety lever 29 also moves downward, so the movable body 30 moves downward along the irregularly shaped hole 32. The movable contact piece 28
The biasing force pressing upward is released, and the lid switch is therefore turned off.

FIG. 3 shows a case where the clothes are largely eccentric in the spin-drying/washing tub (not shown) and are in a spin-drying state, and the water tub (not shown) presses the unbalance lever 29 in the direction of arrow A. At this time, the safety lever 29 rotates counterclockwise about the protruding piece 34 of the base plate 31 against the pressing force of the coil spring 37, and further moves the movable body 30 slightly to the left as shown in FIG. Make it move. At this time, the movable body 30 moves clockwise with respect to the safety lever 29 while slightly moving inside the irregularly shaped hole 32 of the board, and works so that the bent part 28' of the movable contact piece 28 moves downward and turns OFF. state.

This operation will be explained with reference to a detailed enlarged view of FIG. 4.

FIG. 4a shows a state in which the lid is open, that is, the contact between the contact pieces is OFF. FIG. 4b shows a state in which the lid is closed, that is, contact pieces 27 and 28 are turned on. Movable body 3
0 presses the movable contact piece 28 with its right end 38. FIG. 4c shows a case where the unbalanced lever 29 is operated, and the movable body 30 has its shaft support 40 moved to the left by the unbalanced lever 29 and movably contacts the recess 41 provided in the right end tongue piece 38. The tip of the piece 28 retracts, and the movable contact piece 28 moves downward and temporarily
It becomes OFF state. As shown in FIGS. 2 and 3, the unbalanced lever 29 can be rotated clockwise by a pressing coil spring 37, and even if the movable piece moves into the recess 41, it immediately returns to the state shown in FIG. 4b. .

Operation OFF-ON control when the lid of the washing machine is opened and closed is performed by the operations shown in FIG. 4a and b.

Unbalance abnormality detection is performed by the operations shown in FIGS. 4b and 4c.

In an electronically controlled lid switch, as mentioned above, it is necessary to make a large difference between opening and closing the lid and opening and closing the contacts due to the operation of the unbalanced lever. This means that when the user opens and closes the lid quickly, for example, it is necessary to lengthen the contact OFF and ON times when the lid is opened and closed so that the user does not mistakenly think that an imbalance has been detected.

In this invention, the shape of the movable body 30 is changed when the lid is opened/closed and when the unbalanced lever is operated.
This is effectively achieved by supporting the movable body using the zero shape and an unbalanced lever.

FIG. 5 is an exploded view of the lid switch section.

As mentioned above, the movable body is made of electrically insulating plastic material by molding into a substantially U-shaped planar shape, and includes a convex portion 4 formed on the side surface of the safety lever 29.
2, the small hole 43 provided in the U-shaped arm portion 43 is loosely fitted and supported rotatably, and the protrusion 33 provided in the arm portion 43 is inserted into the irregularly shaped hole 32 formed in the substrate 31 described above. It is loosely fitted so that it can slide up and down. This attachment takes advantage of the flexibility of the plastic of the movable body 30.

The lid lever 24 passes through a small support hole 45 formed in the safety lever 29, and its rear end is rotatably held by inserting an L-shaped bent portion 46 into a bearing portion 26 integrally provided on the switch base 25. Ru.

Effects of the Invention As described above, the present invention has a structure in which the movable body attached to the tip of the safety lever immediately presses the movable contact piece of the lid switch, so the structure is extremely simple.
The ease of assembly is also improved, and the movement of the movable contact piece is simplified and reliable, and since one switch serves as both a lid switch and a safety switch, the configuration can be simplified and the configuration can be further improved. Since this is simple, the ON-OFF accuracy of the switch can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional lid switch, and FIG. 2 is a sectional view of a lid switch showing an embodiment of the present invention.
FIG. 3 is a sectional view of the lid switch in its operating state, FIGS. 4a, b, and c are sectional views of essential parts showing the operating state of the lid switch, and FIG. 5 is an exploded perspective view of the lid switch. 30...Movable body, 29...Safety lever, 24...
...Lid lever, 28...Movable contact piece.

Claims (1)

[Claims] 1 Consists of a lid lever that rotates when the lid is opened and closed, and a safety lever that moves up and down due to the operation of the lid lever, and a movable body made of electrically insulating material is rotatably supported on the upper end of this safety lever, In addition, a step is formed on the tongue of the movable body, and the step directly pushes up or down the tip of the movable contact piece of the lid switch to obtain ON-OFF operation. Lid switch.