JPS585595Y2 - drum type washing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum-type washing machine that rotates a rotating drum at a low speed during washing and rotates at a high speed during spin-drying.

Conventionally, in this type of drum-type washing machine, a first drive pulley and a second drive pulley are loosely fitted to the rotating shaft of a pole-switching drive motor, and when the drive motor rotates at a low speed, the A centrifugal clutch is provided on the rotary shaft to transmit rotation between the rotary shaft and the first drive pulley, and to transmit rotation between the rotary shaft and the second drive pulley when the drive motor rotates at high speed.

First and second driven pulleys are respectively fitted onto the drive shaft of the rotating drum, and transmission is performed between the first and second drive pulleys by first and second belts, respectively. When the drive motor rotates at a low speed, the rotary drum is rotated at a low speed via the first drive pulley, the first belt, and the first driven pulley, and when the drive motor rotates at a high speed, the rotary drum is rotated at a low speed, and when the drive motor rotates at a high speed, the rotary drum is rotated at a low speed. The rotary drum is rotated at high speed via the second belt and the second driven pulley.

However, in the above-mentioned conventional configuration, since dedicated first and second belts are required to rotate the rotary drum at low speed and high speed, respectively, it is difficult to adjust the belt tension.
Furthermore, when the rotary drum rotates at low speed, the speed reduction effect is obtained by the diameter ratio of the first drive pulley and the driven pulley, so it is necessary to use an extremely large diameter first driven pulley, which increases the production time. This is not only troublesome, but also requires an increase in the length of the first belt, which has the disadvantage that the first belt is likely to become slack due to dimensional changes.

Furthermore, in the conventional configuration described above, the rotation of the rotating shaft of the drive motor is transmitted to the first drive pulley during low speed rotation by the centrifugal clutch, and to the second drive pulley during high speed rotation. It is necessary to generate a large difference in centrifugal force during high-speed rotation, and therefore a drive motor that has a large speed difference, such as a 2-pole or 8-pole switching type, must be used, making the drive motor expensive. It had some drawbacks.

Moreover, in the conventional structure, during dehydration when the rotating drum is rotated at high speed, the first drive pulley loosely fitted on the rotating shaft of the drive motor is moved by the rotating drum via the first driven pulley and the first belt. Furthermore, since the motor is idled at a high speed, there is a drawback that the life of a rotation support such as a bearing disposed between the rotation shaft of the drive motor and the first drive pulley is shortened.

The present invention was developed in view of the above circumstances, and its purpose is to loosely fit a drive pulley onto the rotating shaft of a drive motor that can switch speeds in two stages, high and low, and to attach a gear case rotatably around the rotating shaft. Further, a restraining spring for restraining rotation of the gear case in one direction is provided across the gear case and a suitable stationary member, so that rotation of the gear case is restrained when the drive motor rotates at a low speed. A gear mechanism for decelerating and transmitting the rotation of the rotating shaft to the drive pulley is provided in the gear case, and the rotation of the rotating shaft is controlled in a state where the gear case can rotate in the other direction when the drive motor rotates at high speed. A centrifugal clutch is provided on the rotating shaft for transmitting the rotational speed to the driving pulley, and a driven pulley is connected to the driving pulley via a belt and rotates the rotating drum. Each dedicated drive pulley for rotation.

There is no need to provide a belt and a driven pulley, so belt tension adjustment is easy, and since the gear mechanism provides a deceleration effect during low speed rotation, there is no need to use a large diameter driven pulley. It is easy to manufacture, the belt is short, and there is no slack in the belt, and the drive motor has a small speed difference between low speed rotation and high speed rotation, so it is easy to wash. It is possible to switch between operation and dewatering, and an inexpensive drive motor can be used.Moreover, the drive pulley does not rotate at high speeds on the rotating shaft during dewatering, and rotational supports such as bearings can be used easily. The purpose of the present invention is to provide a drum-type washing machine that does not have problems that shorten its service life.

An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 1, 1 is an outer box having an opening 2 for putting in and taking out laundry on the front, 3 is a door pivoted to the opening 2 of the outer box 1 to open and close it, and 4 is an outer box. A water tank is suspended in the box 1 via an elastic suspension mechanism 5, and 6 is a connecting body that connects the opening 4a on the front surface of the water tank 4 and the opening 2 in a watertight manner.
Reference numeral 7 designates a rotating drum that is disposed within the water receiving tank 4 and has a large number of small holes 7a in its peripheral wall, and 8 is a stirring blade that is disposed approximately at the rear center of the rotary drum 7.

Now, 9 is a drive mechanism section, which will be described below with reference to FIGS. 2 to 4.

Reference numeral 10 denotes a drive motor whose speed can be changed in two stages, high and low, and whose number of poles can be changed, for example, between two poles and four poles.
It is attached to the rear lower part of the water receiving tank 4 via a mounting plate 11.11 so that it faces rearward.

Reference numeral 12 denotes a gear case consisting of a front case 13 and a rear case 14, in which a central shaft cylinder portion 13a of the front case 13 is connected to the rotating shaft 10a through a bearing metal 15 and a seal member 16. Rotatably supported.

Reference numeral 17 denotes a gear mechanism, which includes a first gear 18 fitted and fixed to the rotating shaft 10a, and a shaft 19 whose front end is supported by the front case 13.
8, a third gear 21 integrally formed with the second gear 20, and the rotating shaft 10a.
a rotary cylinder body 24 rotatably supported around its axis via a bearing metal 22, 22 and a seal member 23;
A fourth gear 25 is fitted and fixed to the front end of the rotating cylinder 24 and meshes with the third gear 21.

The rear case 14 of the gear case 12 is
The gear mechanism 17 is fixed to the front case 13 with screws so that the gear mechanism 17 is housed therein, and the central shaft cylinder part 14a is connected to the rotary cylinder body 24 through the bearing metal 26 and the seal member 27. It is rotatably supported around an axis.

In this case, the rear case 14 supports the rear end of the shaft 19 that supports the gears 20 and 21.

28j, a boss portion 28a is engaged and fixed to the rear end portion of the rotary cylinder body 24.

This is a drum drive pulley, and a frame portion 28C is integrally formed with the rim portion 28b.

Reference numeral 29 denotes a centrifugal clutch, and a boss portion 30a of a tool drive pulley 30 serving as an operating body of this clutch is connected to the rotating shaft 10a.
The device drive pulley 3 is fitted and fixed to the rear end.
The proximal end portions of actuating members 31 and 31 are rotatably supported on the rim portion 30b of 0 through stepped screws 32 and 32, respectively.

A friction member 33.33 is attached to the intermediate portion of the actuating member 31.31 by adhesion or the like so as to face the inner peripheral surface of the frame portion 28C of the drum drive pulley 28.

34.34 is a tension coil spring, one end of which is formed at the base end of the actuation member 31.31 with spring folded pieces 31a, 31.
a, and the other end is engaged with spring folds 31b, 31b formed at the tip of the actuating member 31.31, so that the actuating member 31.31 is always rotated in the direction of arrow A. It is strong.

Reference numeral 35.35 denotes a regulating pin protruding from the tool drive pulley 30, which prevents the operating member 31.31 from rotating in the direction of arrow A against the spring force of the tension coil springs 34, 34. It is now regulated.

36 is a brake mechanism as a restraint mechanism, and its brake drum 37 is integrally formed with the front case 13 so as to surround the shaft cylinder portion 13a. A brake band 39 attached to the brake band 39 is wound around the brake band 39.

An engaging protrusion 39a that protrudes outward is bent at one end of the brake band 39.

Reference numeral 40 denotes a support plate fixed to the mounting plate 11 with screws, and a substantially middle portion of the operating lever 41 is supported on this plate by a shaft 42 so as to be rotatable in the directions of arrow B and counter-arrow B.

The brake band 3 is attached to the tip of the operating lever 41.
A retaining piece portion 41a that engages and disengages from the engaging protrusion 39a of 9 is formed.

A tension coil spring 4 is disposed between the base end of the operating lever 41 and a spring folded piece 40a protruding from the support plate 40.
3 is tensioned, and the operating lever 41 is always rotated in the direction of arrow B by the spring force of this tension coil spring 43, so that its retaining piece 41a engages with the engaging protrusion 39a. The rotation is regulated by a regulating piece 40 b protruding from the support plate 40 .

Reference numeral 44 designates an electromagnetic solenoid screwed to the support plate 40, and its plunger 44a is connected to the base end of the operating lever 41 via a connecting pin 45.

The electromagnetic solenoid 44 is energized to attract the plunger 44a during the dewatering process in the washing operation, and the actuating lever 41 is thereby rotated in the opposite direction of arrow B against the spring force of the tension coil spring 43. When the retaining piece 41 a is moved, the engaging protrusion 3 of the brake band 39
9a is located in an inactive position in which it cannot engage.

Now, 46 is a restraining spring consisting of a clutch spring, which is attached to the shaft cylinder portion 13 of the front case 13.
The sleeve 47 fitted and fixed to the drive motor 10
It is wound around a restraining cylinder 48, which is a suitable stationary member, which is screwed to the end face of the rotary shaft 10a so as to surround the rotating shaft 10a.

This restraining spring 46 is connected to the gear case 12.
Therefore, when the front case 13 receives a rotational force in the direction of arrow C, which is one direction in FIG. Rotation in the C direction is restrained, and gear case 1
When the gear case 2 receives a rotational force in the opposite direction of the arrow C, the gear case 12 becomes loose, allowing rotation of the gear case 12 in the opposite direction of the arrow C.

On the other hand, 49 is a driven mechanism section, which will be explained in the fifth section below.
The description will be made according to the diagram and FIG. 6.

Reference numeral 50 denotes a housing that is attached to the rear plate of the water tank 4 approximately in the center by bolts or the like, and the large diameter shaft cylindrical portion 51 . A small diameter cylindrical portion 52 is formed.

53 is a hollow drive shaft formed by fitting and connecting a large diameter shaft 53 a with a small diameter shaft 53 b; The small diameter shaft 53b is inserted into and supported by the ball bearing 56.
It is inserted into and supported by the small diameter cylindrical portion 52 via.

Further, 57 is a wing shaft, which includes a drive shaft 53, a bearing metal 58, 58, three oil-impregnated felts 59, and a seal member 6.
It is inserted and supported through 0.

Further, at the front end of the drive shaft 53, a patch plate 61 is attached to the rear plate of the rotary drum 4 approximately in the center with bolts or the like.
The stirring blade 8 is connected and fixed to the center portion of the blade shaft 57 through a nut 62, and the stirring blade 8 is connected to the front end portion of the blade shaft 57 through a screw 63.

A boss portion 65 a of a drum driven pulley 65 is rotatably supported on the rear end of the drive shaft 53 via a bearing metal 64 , and a wing shaft 57 is rotatably supported on the rear end of the drive shaft 53 .
A boss portion 66a of a tool driven pulley 66 is fitted and fixed to the rear end portion of the tool.

A drum bell 1-67 is stretched between the rim portion 65b of the drum driven pulley 65 and the rim portion 28b of the drum drive pulley 28, and the drum driven pulley 66
and the rim portion 3 of the implement drive pulley 30.
A tool belt 68 is stretched between the 0 and 0b.

Reference numeral 69 denotes a transmission control mechanism, and its transmission member 70° 70 is bridged and fixed by screws to appropriate two of the plurality of arm portions 65C of the drum driven pulley 65 so as to correspond to each other. Furthermore, substantially oval guide holes 71.71 are formed in these transmission members 70.70.

The edges of this guide (L71) located on the side of the small diameter shaft 53b are formed into inclined parts 71b, 71b which are directed outward from both ends toward the central part 71a.

A rotating member 72 is fitted and fixed to the rear end side of the small diameter shaft 53b of the drive shaft 53, and arm portions 72a, 72a protruding in opposite directions are formed on this rotating member.

Also, the arm portions 72 a , 7 of this rotating member 72.72
At the tip of 2a are stepped studs 73.73 and collars 74.
A substantially intermediate portion of the transmission lever 75.75 is rotatably supported in the directions indicated by the arrows and counter-arrows via the transmission lever 74. Friction members 76, 76 corresponding to the surfaces are attached by adhesive or the like, and rollers 77, 77 are inserted into the guide holes 71, 71 at the other end.
are attached by bolts 78, 78, etc., respectively.

A torsion coil spring 79 is attached to the collar 74.74.
．． 79 is fitted, and one end thereof is connected to the arm portion 72.
a, 72a, and the other end is respectively locked to the transmission lever 75.75, so that the transmission lever 75.
75 is always urged to rotate in the direction of the arrow by torsion coil springs 79 and 79, so that the friction members 76 and 76 are brought into pressure contact with the inner circumferential surface of the housing 50.

Although not shown, the outer box 1 is provided with a water supply solenoid valve for supplying water into the water tank 4 and a drainage solenoid valve for draining water from the water tank 4. A timer is installed to control the

Next, the operation of this embodiment having the above configuration will be explained.

After loading the laundry into the rotating drum 7 through the opening 2, the door 3
When the holder is closed and a timer (not shown) is set, the washing process begins.

During this washing process, the electromagnetic solenoid 44 is de-energized, so the operating lever 41 in the brake mechanism 36 is rotated in the direction of arrow B by the spring force of the tension coil spring 43, and the retaining piece 41a is activated to brake. band 3
9 is engaged with the engaging protrusion 39a.

In the washing process, first, a water supply solenoid valve (not shown) is energized and opened to supply water into the water tank 4. When the water level in the water tank 4 reaches a specified level due to this water supply, the drive motor 10 It is selected to switch to the pole and operates in forward and reverse directions at low speed.

In this case, the rotating shaft 10a of the drive motor 10 is configured to rotate, for example, in the direction of arrow E during forward rotation, and in the opposite direction of arrow E during reverse rotation.

When the rotating shaft 10a of the drive motor 10 rotates in the direction of the arrow E, the gear mechanism 17 acts as a planetary gear mechanism, so the gear case 12 receives a rotational force in the direction opposite to the arrow E, that is, in the direction of the arrow C. A restraining force is applied to the gear case 12 by a restraining spring 46 to restrain its rotation in the direction of arrow C.

Furthermore, when the rotating shaft 10a of the drive motor 10 rotates in the direction opposite to the arrow E, the gear mechanism 17 acts as a planetary gear mechanism in the same way as described above, so that the gear case 12 rotates from the direction of the arrow E to the direction opposite to the arrow C. However, at this time, the engaging protrusion 39a of the brake band 39 engages with the engaging piece 41a of the operating lever 41, restraining the rotation of the gear case 12 in the opposite direction of arrow B.

Therefore, the rotation of the rotating shaft 10a of the drive motor 10 in the arrow E and counter-arrow E directions is decelerated and transmitted to the drum drive pulley 28 via the gear mechanism 17, and further to the drum belt 67.
is transmitted to the drum driven pulley 65 via.

In this case, since the centrifugal force acting on the centrifugal clutch 29 is small, the centrifugal clutch 29 does not operate.

On the other hand, on the driven mechanism section 49 side, the transmission control mechanism 69
The transmission lever 75 is normally rotated in the direction of the arrow by the spring force of the torsion coil spring 79 to press the friction member 76 against the inner circumferential surface of the housing 50, but when the drum driven pulley 65 is When the drum belt 67 is reversely rotated in the directions of the arrow F and counter-arrow F, the transmission member 70 is also rotated in the same direction, and one of the inclined portions 71 b, 71 b of the guide hole 71 is rotated by the roller. 7
7, and this causes the transmission lever 75 to be pressed.
is rotated in the counter-arrow direction against the spring force of the torsion coil spring 79 to separate the friction member 76 from the inner peripheral surface of the housing 50.

Then, when the drum driven pulley 65 is further rotated in the directions of the arrow F and counter-arrow F, one of both ends of the guide hole 71 comes to engage with the roller 77, so that the drum driven pulley 65 Rotation occurs at the end of the guide hole 71, the roller 77
, is transmitted to the rotating drum 7 via the transmission lever 759 rotating member 72 and drive shaft 53, and the rotating drum 7 is rotated in reverse at a low speed to perform washing.

The rotating shaft 10a of the drive motor 10 is rotated by a tool drive pulley 30. Wing belt 68. The water is transmitted to the agitating blade 8 via the implement driven pulley 66 and the blade shaft 57, and the agitating blade 8 is also rotated in reverse to facilitate washing.

In this manner, when the washing stroke has been carried out for a predetermined period of time, the timer shifts to the next exhaust stroke.

In this drainage stroke, the drive motor 10 is cut off, so the rotational force is no longer transmitted to the drum driven pulley 65, and the transmission lever 75 is rapidly rotated in the direction of the arrow by the spring force of the torsion coil spring 79. As a result, the friction member 76 is brought into pressure contact with the inner circumferential surface of the housing 50, and the rotating drum 7 is controlled and stopped.

Further, in this draining process, a draining electromagnetic valve (not shown) is energized and opened, and water is drained from the water receiving tank 4.

In this manner, when the draining stroke has been carried out for a predetermined period of time, the timer shifts to the next low speed rotation stroke.

In this low-speed rotation stroke, the drive motor 10 is selected to have four poles at a low speed, and its rotating shaft 10a is rotated in one direction in the direction of arrow E, which is the same direction as in the next dehydration stroke. The gear case 12 receives a rotational force in the direction of arrow C, and is restrained from rotating in the direction of arrow C by a restraining spring 46.

When the timer moves to the next dehydration process after a short period of time, the electromagnetic solenoid is first energized and the plunger 4 is turned on.
4 a is now attracted, and the operating lever 41 is rotated in the opposite direction of arrow B against the spring force of the tension coil spring 43, so that the retaining piece 41 a engages the engaging protrusion 39 of the brake band 39. Separate from a.

Thereafter, the drive motor 10 is selectively switched from the low speed of 4 poles to the high speed of 2 poles, and its rotating shaft 10 a
is rotated at high speed in the direction of arrow E.

At this time, the centrifugal force acting on the actuating member 31 of the centrifugal clutch 29 greatly exceeds the spring force of the tension coil spring 34, and the actuating member 31 is rotated in the opposite direction of arrow A, causing the friction member 33 to rotate. The frame portion 28C of the drum drive pulley 28 is in pressure contact with the inner circumferential surface of the rotating shaft 10a.
The rotation of the drum drive boo 1 is transmitted via the centrifugal clutch 29.
This will be transmitted to J28.

As a result, the gear case 12 is rotated in the direction of arrow E (opposite to the direction of arrow C), which is the same direction as the rotating shaft 10a.

The rotation of the drum driving pulley 28 is then transmitted to the drum driven pulley 65 via the drum belt 67, so that the rotating drum 7 is rotated in the same manner as described above.

However, in this case, the rotating drum 7 is rotated in one direction at a high speed, thereby dewatering.

In the above case, the reason for not immediately transitioning to the dewatering process after the completion of the draining process by the timer and providing a short low-speed rotation process between these processes is that, for example, if the rotating drum 7 is abruptly moved from a stopped state, This is because if the drive motor 10 is rotated at a high speed, the load on the drive motor 10 becomes too large, so the load is reduced by rotating the rotary drum 7 at a low speed and then at a high speed.

When such a dehydration process is performed for a predetermined period of time, the timer shifts to the next rinsing process.

In this rinsing process, the drive motor 10 is de-energized and the electromagnetic solenoid 44 is also de-energized.
1 is rotated back in the direction of arrow B by the spring force of the tension coil spring 43, and its engagement piece 41a is connected to the brake band 3.
It is now in a state where it can be engaged with the engagement protrusion 39a of No.9.

Further, since the rotational force is no longer transmitted to the drum driven pulley 65, the transmission lever 75 is rotated back in the direction of the arrow by the spring force of the torsion coil spring 79, and the friction member 76
is brought into pressure contact with the inner peripheral surface of the housing 50, thereby braking the rotating drum 7.

In the rinsing step using the timer, water supply and washing are performed in the same way as in the washing step described above.

Thereafter, the timer sequentially performs the same draining process, low-speed rotation process, spin-drying process, rinsing process, draining process, low-speed rotation process, and spin-drying process as described above, and the washing operation ends.

According to this embodiment, the drum drive pulley 28 is loosely fitted to the rotating shaft 10a of the drive motor 10, and the gear case 12 is rotatably provided around the rotating shaft 10a.
Further, a restraining spring 46 restrains the rotation of the gear case 12 in one direction during barrel washing when the drive motor 10 rotates at a low speed, and a brake mechanism 3 restrains the rotation in the other direction.
6, and a gear mechanism 17 for decelerating and transmitting the rotation of the rotating shaft 10a to the drum drive pulley 28 during the washing is provided in the gear case 12, and the gear mechanism 17 is provided in the gear case 12 for decelerating and transmitting the rotation of the rotating shaft 10a to the drum drive pulley 28. A centrifugal clutch 2 that transmits the rotation of the rotating shaft 10a to the drum drive pulley 28.
9 is provided on the rotating shaft 10 a, and the rotation of the drum driving pulley 28 is transmitted to the drum driven pulley 65 of the driven mechanism section 49 via the drum belt 67 to rotate the rotating drum 7. This is what I did.

Therefore, the drum drive pulley 28 is used to rotate the rotary drum 7 at a low speed during washing and at a high speed during dewatering.
It is only necessary to use the drum belt 67 and the drum driven pulley 65. Unlike the conventional method, there is no need to provide dedicated drive pulleys, belts, and driven pulleys for low-speed rotation and high-speed rotation, respectively. The tension of the drum 67 can be easily adjusted, and since the gear mechanism 17 performs the deceleration action during washing as described above, there is no need for the drum driven pulley 65 to perform the deceleration action, unlike in the past. There is no need to use a very large diameter driven pulley 65, which makes manufacturing easier, and the drum belt 67 can be shortened without causing any slack in the drum belt 67.
Furthermore, since it is only necessary to operate the centrifugal clutch 29 during dewatering, the drive motor 10 may be an inexpensive motor that has a small speed difference between low-speed rotation and high-speed rotation and can be switched between two and four poles. It is sufficient to use the drum drive pulley 28, and as mentioned above, unlike the conventional case, there are no drive pulleys, belts, or driven pulleys dedicated to low-speed rotation and high-speed rotation, so the drive pulley 28 for the drum is not used during dewatering. There are no problems such as idle rotation at high speeds, and there are no problems that shorten the life of rotating support parts such as bearings.

In addition, according to this embodiment, since the transmission control mechanism 69 is provided in the driven mechanism section 49, braking is immediately applied to the rotating drum 7 when the drive motor 10 is cut off.

This makes it extremely safe. In the above embodiment, the drive motor 10 is rotated in forward and reverse directions during washing, but it may be rotated in only one direction (arrow E direction), for example, and in this case, the brake mechanism 36 is not required.

Furthermore, in the above embodiment, the stirring blade 8. Tool belt 68
．． The blade driven pulley 66 and the blade shaft 57 may be provided as necessary.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with appropriate modifications within the scope of the gist.

As described above, the present invention provides dedicated drive pulleys for low-speed rotation and high-speed rotation, respectively.

There is no need to provide a belt and a driven pulley, so belt tension adjustment is easy, and since the gear mechanism provides a deceleration effect during low speed rotation, there is no need to use a large diameter driven pulley. It is easy to manufacture, the belt is short, and there is no slack in the belt, and the drive motor has a small speed difference between low speed rotation and high speed rotation, so it is easy to wash. It is possible to switch between operation and dewatering, and an inexpensive drive motor can be used.Moreover, the drive pulley does not rotate at high speeds on the rotating shaft during dewatering, and rotational supports such as bearings can be used easily. It is possible to provide a drum-type washing machine that does not have problems that shorten its life.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical side view;
Figure 2 is an enlarged longitudinal sectional side view of the drive mechanism, Figures 3 and 4.
The figures are sectional views taken along lines III--III and IV-■ in FIG. 2, FIG. 5 is an enlarged vertical sectional side view of the driven mechanism, and FIG.
The figure is a sectional view taken along line VI-VI in FIG. 5. In the drawing, 1 is an outer box, 4 is a water tank, 7 is a rotating drum, 9 is a drive mechanism section, 10 is a drive motor, 10a is a rotating shaft, 12
is a gear case, 17 is a gear mechanism, 28 is a drum drive pulley, 29 is a centrifugal clutch, 36 is a brake mechanism, 39
39a is a brake band, 39a is an engaging protrusion, 41 is an operating lever, 46 is a restraining spring, 48 is a restraining cylinder (stationary member), 49 is a driven mechanism, 53 is a drive shaft, and 65 is a drum driven pulley. , 67 is a drum belt, and 69 is a transmission control mechanism.

Claims (1)

[Claims for Utility Model Registration] 1. A rotating drum, a drive motor whose speed can be switched between high and low speeds, a drive pulley loosely fitted to the rotation shaft of the drive motor, and a drive pulley rotatably installed around the rotation shaft. a restraining spring disposed over the gear case and a suitable stationary member to restrain rotation of the gear case in one direction; a gear mechanism that decelerates and transmits the rotation of the rotating shaft to the drive pulley when the gear case is restrained from rotating; and a gear mechanism that is provided on the rotating shaft and rotates the gear case in the other direction when the drive motor rotates at a high speed. A drum type washing machine comprising: a centrifugal clutch that transmits the rotation of the rotating shaft to the driving pulley in a state where the rotating shaft can rotate; and a driven pulley that is connected to the driving pulley via a belt and rotationally drives the rotating drum. 2. Scope of Utility Model Registration A drum-type washing machine according to claim 1, which is provided with a brake mechanism capable of restraining and releasing the rotation of the gear case in the other direction.