JPS6142599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a drive device for a fully automatic washing machine.

[Background of the invention]

In conventional fully automatic washing machine drive devices, when the stirring blades are reversed in short cycles when washing, for example, when the brake lever rests on the back of the brake band, the engagement between the cottle collar and the movable lever is difficult. If the stirring blade rotates in the direction of dehydration rotation in a state where the mixing is insufficient, the brake lever and brake band engage and apply braking force to the washing and dehydration tank, but the clutch spring switches between washing and dehydration. This has the drawback that the electric motor, which is the driving source for rotating the stirring blades in the forward and reverse directions, locks up.

[Purpose of the invention]

The object of the present invention is to prevent the electric motor from locking even when the stirring blade, which rotates in a short period of time, rotates in the direction in which the clutch spring tightens when the coil collar and movable lever are not fully engaged when washing. The aim is to provide a fully automatic washing machine drive system that can be used.

[Summary of the invention]

A feature of the present invention is that when the pulley is reversed for a short period of time in the direction in which the clutch spring is loosened, the brake lever and brake band are engaged to apply braking force to the washing and dewatering tank. When rotating in one direction and briefly reversing the pulley in the direction that tightens the clutch spring, the movable lever that works with the brake lever loosens the clutch spring and engages the brake lever and brake band. In the drive system of a fully automatic washing machine, which is configured to rotate only the stirring blades in the other direction for a short period of time by applying a brake force to the washing and dewatering tank, when the pulley is reversed for a short period of time in the direction in which the clutch spring is tightened. The main feature is that the electric motor is prevented from locking by rotating the washing and dehydrating tank to loosen the clutch spring.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. The outer side 2 is supported from the upper end of the outer frame 1 by a hanging rod 5 via a spring 4 in a vibration-proof manner. Furthermore, the outer tank 2 includes a washing/dehydrating tank 11 equipped with a stirring blade 7 in the center. The rotation of the electric motor 15 is transmitted via the belt 18 and pulley 14 to the agitating blade shaft 43 via the reduction gear 30 during washing by the bearing clutch device 17, and to the hollow shaft 24 during dewatering.
The stirring blade 7 and washing/dehydrating tank 11 are rotated. The center case 27 rotatably supports the hollow shaft 24 by a ball bearing 25 mounted therein. In addition, the washing and dewatering tank 11 has a balancer 19 sealed with a screw or the like fixed to the top part with a salt water which reduces the whirling around caused by unevenness of the washing product during dehydration, and a bolt 44 attached to the flange 23 at the bottom part. The flange 23 is further fastened to the hollow shaft by a nut 22. The stirring blade shaft 43 is provided to penetrate the hollow shaft 26, and fixes the stirring blade 7 to the upper end. The brake drum 26 is fixed to the hollow shaft 24 by a method such as press fitting. A brake lining 18 is attached to the outer periphery of the brake drum 26 by a method such as adhesion.
A brake band 29 is fitted into which the brake band 29 is fixed. Furthermore, at one end of the brake band 29,
A bent portion 33 is provided. Gearbox 31 is
It is fastened to the brake drum 26 with screws 45. The pulley box 40 is the gear box 31
A clutch spring 42 is wound around the outer periphery with a slight interference so that the clutch spring 42 rotates integrally with the lower rotor shaft 32. A bent portion 41 is formed at the lower end of the clutch spring 42, and is engaged with a coil collar 39 provided on the outer periphery.
The coil collar 39 has a gear-shaped uneven portion 3 on the outer periphery.
8, and is locked by a movable lever 37 at the tip of a clutch lever 36. The clutch lever 36 has a brake lever 34 formed at one end, and a lever torsion spring 35 engages the locking surfaces 46a, 46 of the tip 46 of the brake lever 34.
c is engaged with the bent portion 33 of the brake band 29.

In the structure described above, as shown in FIG. 6, when the clutch lever 36 is pulled in the P direction by an electromagnet (not shown) during dewatering operation, the engagement between the coil collar 39 and the movable lever 37 is disengaged, and Brake lever 34 and brake band 2
9 is disengaged. In this state, the electric motor 15
By rotating in the R direction, the pulley 14 is rotated in the R direction, and the clutch spring 42 tightens, tightening around the gearbox 31 and pulley boss 40 and fixing them both. Therefore, the rotation of the pulley 14 is transmitted to the washing/dehydrating tank 11 via the brake drum 26, the hollow shaft 24, and the flange 23, and a dewatering operation is performed. At this time, the coil collar 39 is engaged with the bent portion 41 of the clutch spring 42, so that the coil collar 39 rotates as a unit. When stopping the dehydration operation, pull the clutch lever 36 to Q.
When the bent portion 33 of the brake band 29 is returned to the direction and the bent portion 33 of the brake band 29 is locked, a braking action is activated due to the sliding resistance between the brake lining 28 fixed to the brake band 29 and the brake drum 26, and the rotation of the basket 11 is promptly stopped. . Furthermore, at this time, the clutch lever 36 and the coil collar 39 are also engaged, and the winding of the clutch spring 42 is also released.

Next, when washing, when the electric motor 15 is rotated in the F direction in the dehydration stopped state, the pulley 14 is rotated in the F direction, and the clutch spring 42 is on the slack side, and the gear box 31 and pulley boss 40 are rotated.
The fixed state of is released, and only the stirring blade shaft 43 rotates, and the stirring blade 7 rotates. Next, the electric motor 15 is
If the clutch spring 42 is rotated in this direction, the clutch spring 42 will be used on the tightening side, but the tip 46 of the brake lever 34 and the bent portion 33 of the brake band 29 will be used in the sixth direction.
When the movable lever 37 is in the position shown in the figure and engaged, the movable lever 37 engages with the uneven portion 38 provided on the outer periphery of the coil collar 39 and pushes the bent portion 41 of the clutch spring 42 toward the loosened side. become. Therefore, even though the clutch screw 42 is used in the tightening direction, a force in the loosening direction is always applied, so that the fixed state between the gearbox 31 and the pulley boss 40 is released. However, the brake lever 36
When the brake band 29 is in the position shown in FIG.
The clutch spring 42 is not sufficiently engaged with the concavo-convex portion 38 on the outer periphery of the clutch spring 42, and the pressing force in the direction F by the movable lever 37 is insufficient, so that the clutch spring 42 is kept in a tightened state.

As a result, the water is dehydrated even when you want to wash it, and you try to rotate the washing and dehydration tank 11, but as the items to be washed and the water to be washed enter the washing and dehydration tank 11, the weight increases and the rotation becomes slow. Slow stirring begins, and the electric motor 15 immediately begins to rotate in the F direction due to the short-period reversal of the stirring blades. Therefore, the electric motor 15 can hardly rotate in the R direction and is in a locked state.

Therefore, the shape of the brake band 29 is changed from that shown in FIG. 3 to a shape provided with a plurality of elongated holes 47 as shown in FIG. 4. In FIG. 5, when the brake lever 34 is placed on the back of the brake band 29, when the brake lever 15 rotates in the F direction, the stirring blade 7 rotates in the R direction, and the washing and dewatering tank 1 is rotated by inertia force.
1 rotates in the F direction, the brake lever 34 falls into the next elongated hole 47, and is locked at one end 49 of the elongated hole 47. Next, when it rotates in the R direction, it is in the locked state as described above, but since it is in the dehydration state, the washing/dehydration tank 11 rotates slightly in the R direction and falls into the next elongated hole 47. The elongated hole 47 has one end 4
9 is left as is, but the other end 48 is chamfered. Therefore, the tip 46a of the brake lever 34
When the washing and dewatering tank 11 rotates in the F direction, it is locked, but when it rotates in the R direction, it separates and the tip 46 jumps over the elongated hole 47 and falls into the next elongated hole 47. become. To facilitate this action, the elongated hole 47 of the brake band 33 has a chamfered end 48 on one side, and the brake lever tip 46 has an inclined surface 46b. Therefore, the washing and dewatering tank 11 rotates in the R direction, and the coil collar 39 is rotated in the R direction via the brake drum 26, gear box 31, and pulley boss 40, which rotate together with the washing and dewatering tank 11. Due to this rotation, the concavo-convex portion 38 of the coil collar 39 fully engages with the movable lever 37 of the clutch lever 36 and obtains a pushing force in the F direction, thereby loosening the clutch spring 42 that is engaged with the coil collar 39. The locked state of the electric motor is released.

Furthermore, as shown in FIG. 6, the brake lever 34
Even when the bent portion 33 of the brake band 29 is properly engaged, the movable lever 37 may not fully engage with the uneven portion 38 due to dimensional variations in the clutch lever 36, coil collar 39, etc. The clutch spring 42 may not be completely loosened and may become slightly locked during rotation in the R direction.

In this case, the sliding resistance between the brake lining 28 and the brake drum 26 is such that the stirring blade 7
rotates, rotates the laundry, and when the basket 11 rotates in the R direction due to the contact resistance between the laundry and the basket 11, the torque is set to be slightly smaller than that of the rotation torque. Despite this, the basket 11 rotates.

However, although the clutch spring 42 is on the tight side when viewed from the pulley 14 side, it is on the loose side when viewed from the gearbox 31 side, and the basket 1
1 rotates in the R direction, the gearbox 31 integrally fixed thereto also rotates in the R direction, loosening the clutch spring 42 and releasing the lock.

In addition, in the shape of the brake band 29 shown in the present invention, the R direction is the slack side and the F direction is the tightening side, and the brake torque on the tightening side is 4 to 5
Even if the stirring blade 7 rotates in the F direction, the sliding resistance between the brake lining 28 and the brake drum 26 is strong, the basket 11 does not rotate, and the clutch spring 42 is also tightened. Never.

〔Effect of the invention〕

As described above, according to the present invention, even if the stirring blade, which is reversed in a short period of time, rotates in the direction in which the clutch spring is tightened when a brake force is applied to the washing and dehydrating tank, the electric motor is not locked. A fully automatic washing machine driving device capable of preventing the above-mentioned problems is obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a fully automatic washing machine according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of a clutch portion, and Fig. 3 is a longitudinal cross-sectional view of a fully automatic washing machine according to an embodiment of the present invention.
4 is a perspective view of a conventional brake band, FIG. 4 is a perspective view of the brake band of the present invention, FIG. 5 is a state diagram of the present invention, and FIGS. 6 and 7 are explanatory diagrams of operation. 11...Washing and dehydration tank, 15...Electric motor, 29...
Brake band, 37... Movable lever, 39... Coil collar, 42... Clutch spring, 46a, 46c
...Locking surface, 47...Elongated hole, 48...Other end, 49...One end.

Claims (1)

[Claims] 1 When the pulley is reversed for a short time in the direction in which the clutch spring loosens, the brake lever and brake band are engaged to apply braking force to the washing and dewatering tank, causing only the stirring blades to rotate in one direction for a short time. At the same time, when the pulley is reversed for a short time in the direction in which the clutch spring is tightened, the clutch spring is loosened by a movable lever that is linked to the brake lever, and the brake lever and brake band are engaged to allow the washing and dewatering tank to be moved. In a fully automatic washing machine drive device that is configured to rotate only the stirring blades in the other direction for a short period of time by applying braking force, when the pulley is briefly reversed in the direction in which the clutch spring is tightened, the washing and dewatering tank When the clutch spring is rotated to loosen the clutch spring, when the pulley is briefly reversed in the direction in which the clutch spring is loosened, the brake lever is engaged with the brake band, and the pulley is briefly reversed in the direction in which the clutch spring is tightened. This drive device for a fully automatic washing machine is characterized in that a long hole is provided in the brake band to allow the brake lever to separate from the brake band when the brake lever is removed from the brake band.