JPH02149239A - Cleaner - Google Patents

Abstract

PURPOSE:To enable the automatic removal of a thread entrapped around a pulley by using a flat belt as a driving belt for a rotary brush and using an approximately truncated cone shape pulley as a driving pulley. CONSTITUTION:A motor 1 is concentrically and monolithically provided with a driving pulley 4 for an air intake generation fan and a rotary brush 3. The tip of the driving pulley 4 is kept in a cantilever state. Also, a driven pulley 5 and the driving pulley 4 provided for the rotary brush are so arranged as to be orthogonal with each other, and a flat belt 6 is extended between the driven pulley 5 and driving pulley 4. A fan shaft 10 is fitted with a truncated cone part 11 leading to the tip of the fan in such a way as to be integral with the driving pulley 4, while the cone part 11 is so made as to be adjacent to to the edge of the large-diameter part 4c of the driving pulley 4 at the side of the edge thereof with the tip 11a of the cone part 11 having approximately the same diameter as the large diameter part 4c of the driving pulley 4, and gradually increasing toward the motor 1 at a larger angle than the driving pulley 4. According to the aforesaid construction, a thread entrapped about the external surface of the pulleys gradually shifts to the small diameter side of the approximately truncated cone type pulley, and discharged outside from the belt part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum cleaner equipped with a rotating brush driven by a belt, and in particular to prevention of thread debris from becoming entangled or wrapped around a pulley for driving the belt. It is.

[Conventional technology]

As a conventional vacuum cleaner equipped with a rotating brush, there is one shown in FIG. 6, for example.

This is a suction tool for a vacuum cleaner, in which brush bristles 200 are erected in a suction tool main body 100 with an open bottom surface, and are fixedly disposed on a rotating brush 300 that is rotatably supported. A drive belt 700 is stretched between the driven pulley 1J400 and a drive pulley 600 fixed to a rotating shaft 500a of a drive device 5000 such as a motor.

In the above configuration, by rotating the drive device 500, the rotating brush 300 rotates on the floor surface 800.

With this, 900 pieces of garbage were swept up from 800 pieces of floor surface,
The suction force of the suction device of the vacuum cleaner main body (not shown) causes the vacuum cleaner to be stored in a dust box (not shown) via the joint 100a. However, thread, hair, cotton waste, etc. (hereinafter collectively referred to as thread waste) are removed by the intake air flow and belt.
It is easy to wrap around the outer circumferential surface of the drive pulley 600, which increases the outer diameter of the drive pulley 600, causing belt tension to become excessive and cause damage, and as a result of applying an excessive load to the motor, etc., it may cause burnout. This may cause danger, or the belt may come off the drive pulley 600, etc.
There were many problems.

Conventionally, as a countermeasure against these problems, for example, Japanese Patent Application Laid-Open No. 6016093
Publication No. 5 discloses a pulley with a separate idle pulley adjacent to the pulley, and when thread entanglement occurs, the belt moves to the idle pulley and stops the rotation of the °C rotating brush. , and Utsukai Sho 60-171249
The publication discloses a suction device that is provided with a detection body that detects the locked state of the belt due to thread entanglement, and lights up a lamp to notify the user when thread entanglement occurs. Furthermore,
In Japanese Utility Model Application No. 63-12353, a pulley is formed from a shape memory alloy, and the circumferential surface of the pulley has a convex cross section at room temperature, but the temperature rises due to frictional heat due to thread entanglement. A suction tool is disclosed in which the cross section is linear or concave in shape, and the belt is twisted so as to idle. However, all of these suction devices are designed to notify you of line entanglement, or to stop the rotation of the rotating brush in the event of line entanglement, thereby preventing damage to the belt or pulley. It is.

[Problem to be solved by the invention]

However, these conventional techniques only notify the user of the phenomenon of entanglement and encourage them to remove it.
There was an inconvenience in that the user had to remove the twisted thread waste each time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum cleaner equipped with a pulley that can automatically remove the wound thread, so that the user does not need the above-mentioned maintenance. be.

[Failure to solve the problem]

In order to achieve the above object, in the vacuum cleaner of the present invention, a flat belt is used as the drive belt of the rotating brush of the vacuum cleaner, and a substantially truncated conical pulley is used as the drive pulley.

[Effect]

If the driving pulley is formed into a substantially truncated conical shape and a flat belt is placed over it, the thread wound around the outer circumferential surface of the pulley will gradually move to the small diameter side of the substantially truncated conical pulley, and eventually , it will be discharged outside from the part where the belt is applied.

〔Example〕

Hereinafter, a vacuum cleaner according to the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment according to the present invention, in which a drive boob IJ is adapted to a suction tool of a vacuum cleaner. A fan 2 for generating intake air and a drive pulley 4 for driving a rotating brush 3 are coaxially integrally attached to a drive device ( ) 1, and the tip of the drive pulley f)! Ai is in a released so-called cantilevered state. Further, a driven pulley 5 and a driving pulley 4 provided on the rotating brush 3 are arranged so as to be orthogonal to each other, and a flat belt 6 is stretched between the driven pulley 5 and the driving pulley 4. The dust swept up by the rotating brush 3 is distributed around the flat belt 6 7
, then passed through the fan chamber 8 and sent into the duct 9.

That is, the drive pulley 4 is located within the dust flow path.

Next, the configuration of the main parts of the present invention will be explained in detail. As shown in the schematic configuration diagram in Fig. 2, the drive pulley 4 has a truncated cone shape (truncated cone) whose diameter gradually decreases along the axial direction from the drive device (motor) side to the other end side. At the same time, a step portion 3b is formed in which the tip portion 4a on the other end side has a slightly smaller diameter. Further, the fan shaft 10 has a tip end 11a that is adjacent to the end face of the large diameter portion 4C of the drive pulley 4 on the motor 1 side, and has a diameter that is approximately equal to the large diameter portion 4c of the drive pulley 4. A truncated conical part (skirt) 11 is provided integrally with the drive pulley 4, forming a taper that gradually expands to a larger diameter in the direction of the motor 1 at a larger angle than the drive pulley and reaching the tip of the fan. It is being As shown in FIG. 3, the flat belt 6 stretched between the truncated conical drive pulley 4 and the driven pulley 5 of the rotating brush 3 has a flat center and a tapered inner end. The formed cross-sectional shape is formed in a chevron shape.

Furthermore, near the tip of the drive pulley 4 (lower position in FIG. 1), when the belt 6 is hooked on the drive pulley 4, there is a gap from the tip 4a of the drive pulley 4, facing the belt side end surface 6a. A belt slip-off prevention tool 12 is provided with a gap of 1-1.

In the above configuration, if thread waste brought by the intake air flow or the drive belt 6 wraps around the drive pulley 4,
The thread waste wound around the pulley moves toward the small diameter portion of the substantially truncated conical drive pulley 4 and is discharged from the tip of the drive pulley 4. This action will be described in detail with reference to FIGS. 4(a) to 4(e). FIG. 4(a) is an explanatory diagram at the moment when the thread waste 20 is wrapped around the drive pulley 4. As is clear from FIG. 4(a), approximately half-circumferential portions 20a, 20b, and 20d of the thread waste with respect to the drive pulley 4 are located between the belt 6 and the drive pulley 4.
However, the other half circumference portion 20C is not restricted by the belt 6 and is in a so-called released state, so the released portion 20C of the thread waste 20 is The moment it wraps around the drive pulley 4, it moves in the direction of the smaller diameter. At the next moment (when the drive pulley 4 has rotated 90 degrees as shown in FIG. 4(b)), the portion 20b of the thread waste 20 that was held between the belt 6 and the drive pulley 4 is also removed from the belt 6. It is released and moves to the small diameter side of the drive pulley 4. As the drive pulley 4 rotates, the thread waste 20 sequentially moves to FIG. 4(C), FIG. 4(d), and FIG. 4(0). FIG. 4(e) shows the state after exactly one rotation from the position shown in FIG. 4(a), and the thread waste 20 has moved by β1 in the direction of the small diameter of the drive pulley 4.

Due to the same action, in the next rotation, it moves further by β2, and is finally ejected from the portion of the drive pulley 4 where the belt 6 is stretched.

The reason for "the semicircular portion of the thread waste 20 in the released state moves to the small diameter portion of the drive pulley 4" in the above explanation is: ■ Tapered shape of the drive pulley 4 ■ Centrifugal force acting on the released portion■ Yarn Coefficient of friction between dirt 20 and drive pulley 4■ Thread dirt 2
It is thought that factors such as the zero winding force interact with each other, but since a strict analysis is difficult, the behavior of the thread waste described above will be omitted. Note that the behavior of thread waste shown in FIGS. 4(a) to 4(e) is not uniform but conceptual.

As mentioned above, the thread waste 20 wrapped around the drive pulley 4 moves to the small diameter part side of the drive pulley 4, so
When the motor 1 is installed on the side and the small diameter side is left open in a so-called cantilevered state, the wound thread waste 20 is removed from the drive pulley 4 and discharged.

However, if a large amount of thread waste is wrapped around the drive pulley 4 at once, the large amount of thread waste interposed between the belt 6 and the drive pulley 4 may cause the drive pulley 4 and the belt
There is a risk that the belt 6 will slip in the direction of the smaller diameter of the drive pulley 4 and eventually fall off from the drive pulley 4. In order to prevent this, the above-described belt detachment prevention body 12 is provided, so that when the belt 6 slips on the drive pulley in the direction of the small diameter and is about to fall off,
The belt 6 is prevented from falling off the drive pulley 4 by coming into contact with the belt coming-off prevention body 12 . Figures 5(a) to (C)
When the belt 6 is about to come off the drive pulley 4 and comes into contact with the belt detachment prevention body 12 as shown in FIG. A stepped portion 4b is provided at the tip of the drive pulley 4 (FIG. 5(b)), and the inner side end of the belt 6 is tapered so that the belt side end comes into contact with the drive pulley 4. Therefore, thread waste is not held down by the belt 6 at the tip 4a of the drive pulley 4, and is more easily discharged outside the drive pulley 4 (fifth
Figure (C)). The reason why the belt 6 is tapered at both ends on the inside is not only to improve thread removal, but also to prevent a large load from being applied to the belt side end on the large diameter portion 4c side of the drive pulley 4. This is also to avoid the risk of the belt 6 being cut from the side end on the pulley large diameter portion 4c side. The belt 6 used with this drive pulley 4 has one end of the belt 6 located on the small diameter side of the drive pulley 4 and the other end of the belt 6 on the large diameter side 4C of the drive pulley 4. It is desirable to use a Goto belt, as it requires appropriate elasticity and flexibility.

However, as described in ), the belt 6 stretches more on the side located on the large diameter portion 4C side of the drive pulley than on the other side when it is resting on the drive pulley 4, so it cannot be used for a long time. At this time, cracks may occur from the end on the large diameter portion 4C side, and there is a risk that the wire will eventually break. Therefore, due to the tapered shape of the belt, the portion of the belt that requires the most degree of elongation is located inward, thereby alleviating stress concentration.

By configuring the belt 6 in this way, the belt 6
A large load is no longer applied to the side ends, and the life of the belt 6 is greatly improved. In other words, if this tapered belt has a configuration in which both the driving pulley 4 and the driven pulley 5 are truncated conical pulleys, the tapered portions at both ends of the belt are both used for thread removal and for the side ends. negative +”=i
This will simultaneously reduce the amount of j.

Further, a skirt 1 that shields the large diameter portion 4c of the drive pulley 4 is provided.
1 prevents thread waste from wrapping around the fan shaft 10, and prevents thread waste from wrapping around the fan shaft 10, and prevents the thread waste from wrapping around the fan shaft 10. The taper angle is set larger than that of the drive pulley 4.The belt detachment prevention body 12 can also be formed as a projection protruding from the bottom surface of the machine body 21, but it can also be formed as a metal plate whose end is fixed to the machine body 21. It may be a tongue-like piece made of a material such as the like, or it may be a roller-like piece that is pivoted to a support portion protruding from the body 21.

In this example, we have described the application to a suction vacuum cleaner, but it can also be applied to a type of vacuum cleaner in which only the rotating brush is rotated by a motor or engine, and the swept dirt is stored directly in the dust collection chamber. Of course, it can be applied, and the same effects as above can be achieved.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The thread waste wrapped around the pulley slides down to the small diameter side of the Boo IJ along the taper formed on the outer circumferential surface of the pulley, is ejected from between the pulley and the drive belt, and is removed from the pulley. Since it is reliably removed, it is possible to avoid stopping the rotating brush or cutting the drive belt due to thread entanglement in the pulley. Therefore, there is no need for troublesome maintenance such as removing thread waste from the pulleys or replacing the belt, so cleaning work is not interrupted, work efficiency is improved, and it is advantageous in terms of cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of the present invention applied to a suction tool for a vacuum cleaner, Fig. 2 is an enlarged perspective view of the main parts of the present invention, and Fig. 3 is a cross-sectional view of a belt. , Figure 4(a)
5(a) to (e) are explanatory diagrams showing the operating state in which thread waste is discharged from the drive pulley, FIGS. 6
The figure is a longitudinal structural explanatory diagram showing a suction tool of a conventional vacuum cleaner. Explanation of number 5 1... Motor 3... Rotating brush... Followed pulley 11... Skirt 2... Fan 4... Drive pulley 6... Belt 12... Belt detachment prevention body

Claims (1)

[Claims] 1. A rotating brush driven by a belt stretched between a driving pulley that is fixed to a rotating shaft of a drive device and located in an intake flow path and a driven pulley of the rotating brush. In the vacuum cleaner, a flat belt is used as the drive belt, and the drive pulley, which is cantilever-supported by the drive shaft of the drive device, has a diameter that gradually decreases in the axial direction from the drive device side to the other end side. A vacuum cleaner shaped like a truncated cone. 2. The vacuum cleaner according to claim 1, wherein a step portion having a smaller diameter than the tip portion is formed at the tip portion of the drive pulley. 3. The vacuum cleaner according to claim 1, further comprising a belt detachment prevention member disposed close to a portion of the drive pulley where the belt is hooked. 4. At the end of the drive pulley on the drive device side, a cone whose tip has a diameter substantially equal to the end of the drive pulley on the drive device side and whose diameter gradually becomes larger in the direction of the drive device at a larger expansion angle than the drive pulley. The vacuum cleaner according to claim 1, wherein the trapezoidal portions are provided adjacently. 5. A vacuum cleaner in which one or both side edges of the inner surface of the drive belt are chamfered into a tapered shape.