JPS6015812B2 - Belt switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a drive pulley and an idling pulley connected to a driven body, and by moving a belt to either one of the pulleys, power is transmitted to the driven body. ON, OFF
The purpose of this invention is to provide a belt cutting device for reliable power transmission.

In conventional belt switching and direct feeding systems, one of the two boleys is generally rotatable with respect to the shaft via a bearing.

By the way, as the above-mentioned bearing, a so-called oil-less metal impregnated with lubricating oil or a bearing coated with grease is used. The bearing is attached to the center of one of the pulleys and rotates together with the pulley, but centrifugal force causes the lubricating oil or grease to scatter in all directions and adhere to the inner surface of the belt. Therefore, in the past, the belt slipped, making the transmission of power to the driven body uncertain, and the life of the belt was also shortened. The present invention eliminates the drawbacks of such a conventional structure, and embodiments thereof will be described below with reference to the accompanying drawings. The figure shows an example of application to an upright vacuum cleaner; 1 is a main body with wheels 2 on the bottom and a suction fan motor 3 built in below; 5 is a handle, and 6 is a dust bag removably attached to the front surface of the main body 1.

Then, the dust-containing air flowing in through the floor nozzle 4 reaches the dust collection case 6, where the dust is removed by a dust collection device (filter) installed at the entrance of the dust collection case 6, and then only the purified air is sent to the fan motor. 3 and is discharged from the exhaust port 7. On the other hand, dust accumulates inside the dust collection case 6, so by removing the dust collection case 6 from the main body 1 at an appropriate time, and further removing the dust collection device and opening its lower part, the accumulated dust can be removed. This makes it easy to dispose of dust. The floor nozzle 4 is made up of upper and lower case members, and is shaped to sandwich both sides of the lower part of the main body 1. It is rotatably connected to a hollow shaft 8 protruding from both sides of the main body 1. Reference numeral 9 denotes a motor shaft of the fan motor 3 that passes through the center of one hollow shaft 8 and projects into the floor nozzle 4.
Further, the floor nozzle 4 has a suction chamber 10 in front thereof,
The lower part of the bracket closes to the bottom surface to form a suction port 11. Reference numeral 12 denotes a circular sardine brush disposed in the suction chamber 10 with the tips of its bristles protruding a certain amount from the suction port 11, and the balls 13 extending in both directions are supported by bearings 14.

Reference numeral 15 denotes a brush provided on the rear side of the suction port 11 and parallel to the rotating brush 12. This brush can freely protrude and retract from the bottom surface of the floor nozzle 4, and when it is in a protruding state, its tip touches the rotating brush 12. The layers are arranged below the brush bristles.

16 is a spring that urges the brush 15 in the retracting direction; 17, 18;
is the shaft 13 of the rotating brush 15 corresponding to the motor shaft 9 mentioned above.
A drive pulley and an idling pulley made of thermosetting resin are inserted into the drive pulley and are located adjacent to and parallel to each other.

One drive pulley 17 is connected to the rotating brush 15, and the other idle pulley 18 rotates idly with respect to the shaft 13. 19 is a bearing for the shaft 13 attached to the center of the idle pulley 18; 20 is a bumper;
Reference numeral 1 denotes a brush cutting body provided with a brush 15 on the shaft body 23.
A portion thereof has a cam 24 in contact with the upper end, and a mountain-shaped protrusion 25 is formed at the center of the lower end surface of the pond.

A sphere 27 energized by a spring 26 is in pressure contact with the lower end surface of the brush switching body 22 having the protrusion 25, and as the sphere 27 climbs over the protrusion 25, the brush switching body 22
2 performs a click operation. 28 is floor nozzle 4
An operator of the brush sliding body 22 protruding upwardly, 29
The copper part 3 is a belt switching body movably supported by a partition wall of the floor nozzle 4, and engages with a flat belt 30 stretched between the motor shaft 9 and one of the pulleys 17 and 18.
1 at one end, and the other end is pivoted at a location eccentric from the ball body 23 of the brush cutting body 22.

In the above configuration, when cleaning the bathtub, first rotate the brush switching body 22 clockwise in FIGS.
is separated from the brush 15, and from this the brush 15 is separated from the spring 1.
6 causes it to sink upward, that is, into the floor nozzle 4.

In response to the clockwise rotation of the brush switching body 22, the belt switching body 29 moves to the right in FIG. 6, and its hook portion 31 moves the flat belt 30 toward the drive pulley 17. Therefore, the rotation of the fan motor 3 is transmitted from the flat belt 30 to the drive pulley 17 and to the circular rotating brush 12. From the above, the dust attached to the carpet is scraped up by the rotating brush 12 and passed through the suction port 11 into the suction chamber 10.
, and then passes through the hose 21 to reach the dust collector of the main body 1.

When cleaning tatami or wooden floors,
Contrary to the above, the brush switching body 22 is rotated in the direction of the rebound indicator to set it to the dotted line position layer.

Therefore, the cam 24 works with the brush 15 to project it below the bottom surface of the floor nozzle 4 against the spring 16, and the belt switching unit 29 also operates to the left in FIG. 6, causing the flat belt 30 to idle. Move it to the pulley 18 side.

The idling pulley 18 simply rotates idly from the point where it is not restrained in any way with respect to Satoshi 13, and therefore,
The rotating brush 12 does not rotate. From the above, cleaning such as folding is done while supporting the floor nozzle 4 with the brush 15.
Moreover, the cleaning can be carried out with the rotating brush 12 floating above the surface to be cleaned.

By the way, as shown in Fig. 7, both the driving and idling pulleys 1
Among the driving pulleys 7 and 18, a circular recess 32 is formed from the outer surface of one drive pulley 17, and an annular protrusion 33 facing into the recess 32 is formed from the inner surface of the other idle pulley 18. The protrusion 33 is provided so as to surround the bearing 19, and its inner periphery is on the bearing 19 side, that is, the protrusion 33
It is set in a tapered shape so that the back part is the same size as a mug. However, if the bearing 19 is made of oil-less metal, even if lubricating oil or grease is scattered due to centrifugal force, it will be caught by the ridges 33, and the inner circumference is tapered. , is held in the raised part, that is, in the inner part of the protrusion 33.

Therefore, lubricating oil does not reach the flat belt 30.

Further, if the amount of lubricating oil etc. that is scattered is large and there is a risk of overflowing from the inner circumference of the protrusion 33, the inner circumference of the recess 32 may also be tapered in the opposite direction to the protrusion 33. Here, the oil that has reached the recess 32 is guided by the taper and the oil reaches the recess 32.
It is held in the inner part of 2. In the above embodiment, the idling pulley 18 is not fixed to the shaft 13, and the drive pulley 17 is fixed, but the relationship between fixed and non-fixed to the shaft 13 is reversed (in this case, the rotating brush rotates around the outer periphery of the shaft). ), and the bearing is provided on the drive pulley side, the same applies, and the positions of the protrusions and recesses may be reversed.

Of course, it goes without saying that the spirit of the present invention can be applied to devices other than vacuum cleaners. In this way, the present invention
A drive pulley linked to the driven body, an idling pulley adjacent to the drive pulley in parallel and operatively separated from the drive pulley, and a drive pulley that controls the rotation of the drive source between the two pulleys.
A belt for transmitting power to one of the pulleys, a brush switching body for shifting the belt to the drive pulley or the idle pulley, and a shaft penetrating at least the center of both pulleys, and one of the pulleys is connected to the shaft. At the same time, a bearing for the shaft is attached to the unfixed pulley, and an annular protrusion surrounding this bearing is attached to the side of one of the pulleys, and a recess where the protrusion faces is provided. are formed on the side surfaces of the other pulley, and the inner periphery of the protrusion is a tape.
The par-shaped design prevents the belt from slipping due to lubricating oil, grease, etc. scattered from the bearing, and ensures reliable power transmission to the driven body.
Furthermore, the life characteristics of the belt can also be improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an upright type vacuum cleaner embodying the present invention, Fig. 2 is a partially exposed side view, Fig. 3 is a bottom view with the lower case member of the floor nozzle removed, and Fig. 4 The figures are a sectional view taken along the line AA in FIG. 2, FIG. 5 is a sectional view taken along the line BB', FIG. 6 is a sectional view taken along the line C-C', and FIG. 7 is an enlarged sectional view of the main parts. 3... Drive source (fan motor), 12...
... Driven body (rotating brush), 13 ... Axis,
17... Drive pulley, 18... Idle pulley, 19... Bearing, 29... Belt switching body, 30... Belt, 32...・Concavity,
33...Protrusion. Figure 2 Figure 5 Figure 1 Figure 3 Figure 6 Figure 7 Figure 4

Claims (1)

[Scope of Claims] 1. A drive pulley linked to a driven body, an idling pulley adjacent to the drive pulley in parallel and operatively separated from the drive pulley, and a drive pulley that controls the rotation of the drive source from both of the above. a belt for transmitting power to one of the pulleys; a belt switching member for shifting the belt to the drive pulley or the idle pulley;
At least a shaft passing through the center of both pulleys is provided, one of both pulleys is fixed to this shaft and the other is not fixed, and a bearing for the shaft is attached to the non-fixed pulley. Further, an annular protrusion surrounding the bearing is formed on the side surface of one pulley, and a recess facing the protrusion is formed on the side surface of the other pulley, and the inner periphery of the protrusion is a diameter deeper than the diameter of the inlet. A belt switching device characterized by having a larger tapered shape. 2. The belt switching device according to claim 1, wherein the inner periphery of the recess is tapered so that the diameter at the back is larger than the diameter at the entrance.