JPS6310151Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a push washing machine that washes laundry by pushing it with a pushing body provided in the washing tub in order to reduce damage to fabrics.

(b) Prior Art Various types of push-wash washing machines have been proposed in the past, and one of them, as seen in Publication No. 1989-9892, has a rotary plate attached to a drive shaft protruding from the center of the bottom of the washing tub. The center is fixed, and the pressing body is pivotally supported on an eccentric shaft protruding from the rotary plate, and the pressing body is rotated around the drive shaft by the rotation of the drive shaft, and the pressing body is moved between the pressing body and the washing tub wall. There are some machines that press the laundry to wash it. In such a device, due to the weight of the pressing body and the eccentric shaft, and also due to the reaction force applied to the pressing body when the laundry is pressed between the pressing body and the washing tub wall,
There were problems such as warping of the rotating plate and loosening of the screws fixing the rotating plate to the drive shaft.

(c) Purpose of the invention The purpose of the invention is to control the warping of the rotary plate and fix the rotary plate to the drive shaft without increasing the gap between the rotary plate and the bottom of the washing tub, which is not directly necessary for washing. This is to prevent the screws in place from loosening.

(d) Structure of the invention The invention is based on an eccentric shaft in which at least two annular ribs concentric with the center of the rotating plate are integrally suspended from the back surface of the rotating plate, and a pressing body is pivotally supported with respect to the center of the rotating plate. On the opposite side, by installing the roller so that there is a slight gap between the ribs and the bottom of the washing tub, the roller does not always come into contact with the bottom of the washing tub, and the rotary plate receives a large force and tends to deform. At this time, this roller hits the bottom of the washing tub to prevent the rotating plate from warping, prevents the screws that fix the rotating plate to the drive shaft from loosening, and also prevents the screws fixing the rotating plate to the drive shaft from loosening. In addition to reinforcing the rotary plate to make it difficult to deform, the presence of the rollers eliminates the need to increase the height of this rib, that is, without increasing the gap between the rotary plate and the bottom of the washing tub, which is not necessary for washing. This prevents the rotating plate from deforming and the screws from loosening.

(E) Embodiment 1 is a washing tub that also serves as a dehydration tank, and a balance ring 2 is attached to the upper edge of the washing tub, and a large number of dehydration holes 3 are provided in the peripheral wall. Reference numeral 4 denotes an outer tub in which the washing tub 1 is housed, and is suspended from the upper part of the machine frame 6 by a plurality of hanging rods 5 in a vibration-proof manner. A cylindrical washing tub shaft 7 is fixed to the center of the bottom of the washing tub 1, and the center of a circular rotary plate 9 is fixed to a drive shaft 8 rotatably supported within the shaft 7 by a screw 10. An eccentric shaft 11 is protruded from a position eccentric from the center of the rotating plate 9,
A center hole of a pressing body 13 having a plurality of blades 12 protruding radially is fitted into the eccentric shaft 11.
3 is pivotally supported around an eccentric shaft 11 so as to freely rotate. 14 is a nut screwed onto the male thread at the tip of the eccentric shaft 11 to prevent the pressing body 13 from coming off upward; 15 is a screw for fixing the eccentric shaft 11 to the rotating plate 9; and 16 is the lower end of the pressing body 13. This is an annular rib that is integrally provided on the rotary plate 9 to prevent laundry from entering between the rotary plate 9 and the rotary plate 9. A motor 17 is attached to the outer bottom surface of the outer tank 4, and a small pulley 1
8. The washing tub shaft 7 and the drive shaft 8 are rotated through the belt 19, the large pulley 20, and the bearing case 21 containing a reduction gear, a washing/dehydration switching clutch, and a braking device.

On the back surface of the rotary plate 9, there are two annular ribs 22 and 23 concentric with the center thereof, and a straight rib 2 on a line connecting the center of the rotary plate and the eccentric shaft 11.
4 are hanging together. the annular rib 22,
At the position intersecting the linear rib 24 between 23,
Rollers 25 and 26 are provided. The rollers 25 and 26 rotate around a shaft 27, and
As is clear from FIG. 5, both annular ribs 22,
It is passed through shaft holes 28 and 29 provided in 23, and is attached to a male screw 30 at the tip thereof by tightening a nut 31. The lower end of the roller 25 has a gap of about 1 mm from the bottom surface of the washing tub 1.

The operation of this configuration will be explained.
When the motor 17 is driven during washing, it is decelerated between the small pulley 18 and the large pulley 20, and is further decelerated by the deceleration gear device inside the bearing case 21, so that only the drive shaft 8 is rotated alternately left and right at a low speed, and the rotation plate 9 rotates. As the rotary plate 9 rotates, the pressing body 13 revolves around the drive shaft 8, and the laundry is pressed in places where the distance between the pressing body 13 and the washing tub wall is narrow, and conversely, it is not pressed in places where the distance is wide. floating in the water. When the laundry is pressed down, there is no escape to the left or right, so
The laundry is pushed upward along the wall of the washing tub where the distance is slightly wider, and when it reaches the upper part, it is pulled toward the center of the washing tub by the movement of the pressing body 13, and the laundry below the center is pushed outward. It falls into a place where it has disappeared. In this way, the laundry is pressed inside the washing tub and is switched from top to bottom.
You can wash your clothes with less uneven washing. Moreover, since the pressing body 13 freely rotates with respect to the eccentric shaft 11,
When it hits the laundry, it rotates, and no excessive force is applied to the fabric, causing almost no damage to the fabric.

By the way, FIG. 6 shows the distance B between the drive shaft 8 and the eccentric shaft 11 (that is, the distance B between the eccentric shaft 11 and the inner diameter A of the washing tub 1).
The horizontal axis shows the value of (B/A) x 100, and the vertical axis shows the number of times the laundry is turned upside down in 10 minutes of washing time. Inner diameter A of washing tub 1 = 400 [mm], load amount
2.5 [Kg], water volume 42 [], rotating plate 9 rotation speed 175 [rp
m] to the left and right alternately with a 1 second pause time in between.
These are experimental values when rotating for seconds at a time. Also the 7th
The figure shows the relationship between the number of times the laundry is turned up and down during a 10-minute washing time and the washing ratio under the same conditions. As is clear from FIG. 6, the eccentric shaft 11
As the amount of eccentricity increases, the number of times the laundry is turned up and down increases, but if the amount of eccentricity increases too much,
As the pressing body 13 rotates, the laundry is concentrated in one place, which in turn reduces the number of times the laundry is switched up and down, and eventually, the laundry becomes larger than the narrower distance between the pressing body 13 and the wall of the washing tub. It becomes a lump of shape, and it takes a considerable amount of force to press it, and the power of the motor is insufficient, resulting in a locked state, or the lump simply revolves around the pressing body. Experimental results B/A
If the value exceeds 0.175, driving will no longer be smooth.

In addition, the current JIS standard requires a washing ratio of 0.6 or more, and as shown in Figure 7, the number of times the laundry must be moved up and down to obtain a washing ratio of 0.6 or more is two or more times.
From FIG. 6, the B/A required to obtain the number of replacements of two or more times is 0.075 or more. As a result, it was found that the eccentricity such that 0.075<B/A<0.175 is appropriate.

Here, the cleaning ratio is Cleaning ratio = Cleanliness of test washing machine / Cleanliness of standard washing machine is required.

In addition, cleanliness =
The light reflectance of the cloth after washing - the light reflectance of the cloth before washing/the light reflectance of the original cloth - the light reflectance of the cloth before washing.

Moreover, FIG. 8 shows the changes in the cleaning ratio and cloth damage [%] with respect to the rotational speed of the rotary plate 9, and the inner diameter A of the washing tub 1 = 400 [mm], the amount of eccentricity B of the eccentric shaft 11 = 45
[mm], load amount 2.5 [Kg], water amount 42 [], rotating plate 9
This is an experiment in which the left and right sides were rotated alternately for 5 seconds each with a 1-second stop period in between. As a result, a cleaning ratio of 0.6 or more is obtained when the rotation speed is 100 [rp, m] or more, and fabric damage is 4 [%] (a typical value for conventional washing machines) when the rotation speed is 300 [rpm] or less. The number is preferably 100 to 300 [rpm].

In addition, Figure 9 shows the relationship between the time that the rotary plate 9 can be continuously rotated at each rotation speed, and as the time that the rotary plate 9 can be continuously turned on becomes longer, the laundry will be pushed to one side and the pressure will be lower. The distance between the body and the washing tub wall is the narrowest, and it becomes a larger lump, and even if you try to press the lump, the power of the motor is insufficient and it becomes locked, so this shows the limit time. It is something. The experiment was conducted under the same conditions as in FIG.

Here, the fabric damage is determined by: weight of test fabric before washing - weight after washing/weight of test fabric before washing x 100 [%].

By the way, the rotary plate 9 is affected by the weight of the pressing body 13 and the eccentric shaft 11, and by the reaction force (first
(in the direction of the solid line arrow in the figure). However, at this time, among the rollers 25 and 26 attached to the back surface of the rotary plate, the roller 25 attached mainly to the side opposite to the eccentric shaft 11 comes into contact with the bottom surface of the washing tub 1 to prevent warpage of the rotary plate, and the rotary plate 9 The screw 10 fixed to the drive shaft 8 is prevented from loosening. Also, since the annular ribs 23, 23 to which the shaft 27 of the roller 25 is attached and the linear rib 24 act as reinforcing ribs, the ribs 22, 2
3 and 24 also make it difficult for the rotating plate 9 to deform. Here, if the roller 25 does not prevent the warping of the rotary plate 9, the ribs 22, 23 and 2
4 has to be made higher and further reinforced, which increases the distance between the rotating plate 9 and the bottom of the washing tub 1, and reduces the volume between the rotating plate and the bottom of the washing tub that is not directly necessary for washing. However, by providing the roller 25, the height of the ribs 22, 23 and 24 does not have to be so high, and the distance between the rotating plate and the washing tub can be reduced. It can be shortened and waste water can be minimized.

The above description has been made regarding washing, but for dewatering, after opening the drain valve 32 and draining water, the washing tub shaft 7 and the drive shaft 8 are rotated at the same high speed to rotate the washing tub 1 at a high speed. At this time, the pressing body 13 is in a stationary state relative to the washing tub 1. During such dehydration, the rotary plate 9 tends to warp due to the centrifugal force applied to the pressing body 13 (in the direction of the dotted line arrow in Figure 1), but in this case, the roller 26 attached to the eccentric shaft 11 is mainly bent against the bottom surface of the washing tub. Controls warpage by contacting with.

In the above embodiments, the washing tub also serves as a dehydration tub, but a simple washing tub may also be used.

(f) Effects of the invention The roller installed on the opposite side of the eccentric shaft from the center of the rotating plate prevents the rotating plate from warping during washing, and prevents the screws fixing the rotating plate to the drive shaft from loosening. Can be done. In addition, the annular rib attached to the roller shaft can reinforce the rotary plate to prevent it from deforming, and the height of this rib can be lowered by the action of the roller, eliminating the rotary plate and the bottom of the washing tub that do not contribute to washing. Water waste can be minimized by shortening the distance between the

[Brief explanation of the drawing]

The drawings show the present invention: Fig. 1 is a longitudinal cross-sectional view of a push washing machine, Fig. 2 is a plan view of the washing tub, Fig. 3 is a rear view of the rotary plate, and Fig. 4 is a line drawn from Fig. 3. 5 is an enlarged view of the circle in FIG. 4, and FIGS. 6 to 9 are characteristic diagrams of the washing machine. 1... Washing tub, 8... Drive shaft, 9... Rotating plate,
11... Eccentric shaft, 13... Pressing body, 22, 23...
...Annular rib, 25...Roller.

Claims (1)

[Scope of utility model registration request] The center of the rotary plate is fixed to the drive shaft protruding from the center of the bottom of the washing tub, and the eccentric shaft protruding from the rotary plate is
In a device that pivotally supports a pressing body that presses the laundry between the walls of the washing tub, at least two annular ribs that are concentric with the center of the rotating plate are integrally suspended from the back surface of the rotary plate, and a space between the ribs is provided. A push-washing washing machine comprising a roller mounted on the opposite side of the eccentric shaft with respect to the center thereof, with a slight gap between the roller and the bottom surface of the washing tub.