JPH1129264A - Hose letting-out/taking-in device for power sprayer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the letting-out and taking-in of a hose suitable for the sensitiveness of a worker. SOLUTION: In a hose letting-out/taking-in device comprising a hose reel 2 which is engaged with a reversely rotating winding drive shaft 13 for winding up a hose 8 and a feeding roller 1 which is engaged with a normally rotating delivery drive shaft 31 for feeding a hose 8 extended from the hose reel 2 and routed around which lets out or takes in the hose 8 furnished with a power sprayer, the hose reel 2 is connected to the winding up drive shaft 13 so that it can be rotated freely in normal direction when the hose 8 is fed out, the feed roller 1 is formed roughly in a pulley-shape having a groove width larger than twice the outside diameter of the hose 8, and the hose 8 extended from the hose reel 2 is wound and routed on the feeding roller by one or more turns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose feeding / winding device in a power sprayer.

[0002]

2. Description of the Related Art A power sprayer is a machine for sending a chemical solution with power to an extended hose and spraying the chemical solution from a hose nozzle, and is used, for example, for spraying agricultural chemicals on a greenhouse or a farm. If the hose is extended beyond a certain amount from the sprayer body, the hose cannot be pulled out only by the operator's force due to the weight of the hose itself and friction with the ground.
Therefore, the power sprayer is provided with a hose delivery / rewinding device for assisting the delivery of the hose and rewinding the extended hose back to the sprayer body.

[0003] The hose delivery / rewinding device (1) is extended only when the worker pulls the hose when the hose is extended, and when the worker stops pulling the hose, the delivery is interrupted. When winding, it is desirable not to cause resistance of winding. Japanese Utility Model Laid-Open No. 6-81282 is an example of a conventional hose feeding / winding device that takes these requirements into consideration. In this device, a pulley (delivery roller) having a V-shaped groove from a winding drum (hose reel) for winding a hose
Hang the hose around and send out the hose. When the hose is extended, the pulley rotates in the delivery direction of the hose. When the worker pulls the hose, the pulley is pressed against the V-shaped groove and the hose is sent out. However, when the worker stops pulling the hose, the V-shaped groove is used. The pushing force of the hose to the hose is weakened, and the delivery of the hose is interrupted.

[0004] In addition, as a conventional hose feeding / rewinding device, Japanese Utility Model No. 4-2947 (using a power capable of rotating forward and reverse,
A one-way clutch is provided between the drum and the delivery roller, and the drum is freely rotated at the time of hose delivery and the delivery roller is freely rotated at the time of winding., No. 5-15506 (one-way rotation between the drum and the delivery roller using the power of one-way rotation) A clutch is provided, and the drum is freely rotated when the hose is sent out, and the delivery roller is freely rotated when the hose is taken up.) No. 7-2362 (implementing hose delivery and winding with power whose rotation is restricted in one direction)
There is no mention of the requirement of (1) (when extending the hose, send only when the worker pulls the hose, and stop sending when the worker stops pulling the hose).

[0005]

Examination of Japanese Utility Model Laid-Open No. 6-81282 which satisfies the above requirements (1) and (2) can point out the following problems. (a) When extending the hose,
When the worker stops pulling the hose, the hose is interrupted. However, if the rotation of the pulley (delivery roller) is not stopped during this time, the hose will rub against the pulley. this is,
This causes wear and breakage of the hose and reduces the durability of the hose.

(B) Hose delivery / interruption is repeated depending on the degree of pulling by the operator. If the two are not properly switched, the hose may be entangled near the pulley (delivery roller). Pressing the hose into the V-groove tends to cause a delay in the switching. Also, (c) it is difficult to set how much the hose must be pulled in order to send out the hose, in connection with the switching of the hose sending. Preferably, the hose is sent out in accordance with the walking speed of the worker. However, it is considered that sending the hose by pressing against the V-shaped groove requires a greater pulling.

[0007] Finally, (d) if the hose is loosened independently of the intention of the operator while the delivery of the hose is stopped,
The hose gets entangled and interferes with the next delivery of the hose. For this reason, it is desirable to suppress free rotation of the drum (hose reel) due to vibration of the sprayer main body, and to stop the pulley (delivery roller) and also stop the drum without coasting at the same time. In the above example, such means are not provided.

[0008] Of course, while solving these problems,
(e) Smooth delivery / rewinding of the hose is most important. Therefore, the requirements as a hose sending / rewinding device (1)
In order to develop a hose delivery / rewinding device that realizes delivery and winding of a hose suitable for the operator's feeling while satisfying (2) and keeping in mind the above points (a) to (e), The structure and configuration were to be considered.

[0009]

SUMMARY OF THE INVENTION As a result of the study, a hose reel that engages with a winding drive shaft that rotates in the reverse direction to wind up a hose, and a hose reel that engages with the delivery drive shaft that rotates in the forward direction. And a delivery roller for delivering the hose extended from the reel and hanging around the hose.
The hose reel is connected to the take-up drive shaft so that it can rotate freely when the hose is sent out, and the sending roller has a substantially pulley shape with a groove width larger than twice the outer diameter of the hose. A hose delivery / rewinding device wound around the delivery roller by one or more turns. The hose reel and the take-up drive shaft may be connected by an electromagnetic clutch that connects them only when the hose is taken up. In addition, the forward rotation referred to in the present invention is to rotate in the direction in which the hose is sent out,
Reverse rotation means rotating in the direction to wind up the hose
(In FIG. 1 described later, forward rotation is left rotation, and reverse rotation is right rotation).

When the hose is pressed against the delivery roller with a certain pressing force P, the hose can be delivered according to the rotation of the delivery roller. The pressing force P is determined by the friction coefficient μ of the hose against the delivery roller (determined by the outer diameter of the hose, the material, the diameter, material, shape, number or arrangement of the delivery roller), the winding angle α of the hose around the delivery roller, Tension to be applied (Hose pulling force by worker (hereinafter Ff (forward))
) And the pulling force of the hose between the hose reel and the delivery roller (hereinafter referred to as Fb (backward))
Are larger, respectively. Conventionally, the shape, number and arrangement (2
In contrast, the friction coefficient μ was increased by devising the friction coefficient μ by devising the delivery roller at the base, while the present invention increases the frictional force by increasing the winding angle α of the hose around the delivery roller, The difference is that the pressing force P is increased to such an extent that the suspended hose can be sent out.

That is, in the present invention, instead of locally increasing the frictional force to secure the necessary pressing force P, the hose is pressed against the delivery roller over a wide range while lowering the pressing force P per unit area. , The necessary pressing force P is secured. Thereby, the durability of the hose can be improved (solution (a)). The reason why the width of the groove of the delivery roller is set to be larger than twice the outer diameter of the hose is that one or more turns of the hose are wound around the delivery roller. This is to prevent contact with the side surface.

Further, in the hose delivery / winding device,
A sensor that detects that the hose has increased in diameter in the radial direction of the delivery roller due to a change in tension applied to the hose is disposed near the hose that is suspended around the delivery roller. The normal rotation of the roller is interrupted, and when the sensor detects the diameter reduction of the hose, the normal rotation of the delivery roller is restarted. Since the hose is pressed against the groove bottom of the delivery roller by the pressing force P according to the pulling forces Ff and Fb and is reduced in diameter, the hose expands when the worker stops pulling the hose. In this way, the fact that the sensor has detected the expansion of the hose is regarded as the fact that the worker has stopped pulling the hose, and the unnecessary forward rotation of the delivery roller such that the hose and the delivery roller are rubbed is interrupted ((( b) solution). Sensors include plate switches that are pressed against the outer surface of the expanding hose and optical sensors that detect the outer surface of the hose.The plate switch is used as a switch to stop the rotation of the drive shaft. The rotation of the drive shaft is switched by judging the diameter expansion.

In particular, in the hose feeding / winding device described above (in which one or more turns of the hose are wound around a substantially pulley-shaped feeding roller having a groove width larger than twice the outer diameter of the hose),
Since there is almost no interaction between the pulling force Ff of the worker and the pulling force Fb between the hose reel and the pulling force Fb is substantially constant, the diameter expansion of the hose occurs in inverse proportion to the pulling force Ff. For this reason, the sensor will almost certainly detect the suspension of the pulling of the operator through the expansion of the hose. As a result, repeating the operation / stop of the delivery drive shaft in accordance with the presence or absence of the sensor detection appropriately switches delivery / interruption of the hose according to the pull of the operator (solution of (b)). Further, since the hose is easily reduced in diameter by the tension of the hose due to the walking of the worker, the delivery of the hose can be restarted quickly by detecting the reduced diameter, so that the sense of the worker can be further improved. It is possible to send / interrupt the hose conforming to the above (solution of (c)).

Next, in the hose feeding / winding device,
A delivery drive shaft that rotates forward with respect to the delivery roller and the delivery roller are connected via a one-way clutch so that the delivery roller engages with the delivery drive shaft. In order to achieve this, we have developed a device that reversely drives the drive shaft at a speed higher than the rotation speed of the delivery roller, which rotates in reverse according to the winding of the suspended hose. In this hose delivery / rewinding device, when the delivery drive shaft rotates forward with respect to the delivery roller, the two engage with each other. Therefore, when the winding hose rotates the delivery roller in the reverse direction, the delivery drive shaft becomes relatively located. Rotates forward, and stops the reverse rotation of the delivery roller. Therefore, by driving the delivery drive shaft in reverse rotation at a speed equal to or higher than the rotation speed of the delivery roller, the same state as when the delivery drive shaft is reversely rotated relative to the delivery roller is created. Is released and smooth winding is ensured (solutions (b) and (e)).

In the above-mentioned hose feeding / rewinding device, the winding drive shaft and the electromagnetic brake, which are relatively positively rotated with respect to the negative-acting type electromagnetic brake that performs braking in conjunction with the stop of the delivery drive shaft, are formed. The two are connected via a one-way clutch so as to engage, and when the hose is delivered, the brake is released by energizing the electromagnetic brake to allow free rotation of the hose reel, and when the delivery and winding of the hose are stopped. The power supply to the electromagnetic brake is cut off to brake the take-up drive shaft that is about to rotate forward, so that the stop of the hose reel engaged with the take-up drive shaft can be maintained. The braked electromagnetic brake is rotated in the reverse direction relative to the winding drive shaft which is about to rotate in the hose sending direction, and the two are engaged by a one-way clutch to indirectly prevent the hose reel from freely rotating. . Further, since the electromagnetic brake works in conjunction with the stop of the delivery drive shaft, it suppresses the coasting rotation of the hose reel immediately after the stop or the stop of the delivery of the hose. In this way, the loosening of the hose due to the free rotation or the inertial rotation of the hose reel is eliminated, and the appropriate and accurate switching of the hose delivery / rewinding shown in each hose delivery / rewinding device is guaranteed (solution (d)). ). Since the brake of the electromagnetic brake is applied to the hose reel via the one-way clutch, it is possible to wind the hose by rotating the hose reel in the reverse direction even in a state where braking is effective (a state in which the electromagnetic brake is de-energized). In addition, the negative operation type electromagnetic brake does not need to be energized in order to operate the braking, so that the power consumption of the battery can be suppressed.

Further, in any of the hose feeding / winding devices, it is preferable that the drive source of the feeding drive shaft is a DC motor. DC motors have the advantage of reducing the installation space as a drive source, and can quickly react to stop the forward rotation of the delivery roller when the above-mentioned sensor detects the expansion of the hose ((b), (e) solution). Further, this DC motor has a feature that the rotation in a no-load state is slightly increased, and in the present invention, it has an advantage that it is convenient to reversely rotate the delivery drive shaft at a speed higher than the winding speed of the hose.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the entire power atomizer to which the present invention is applied, FIG. 2 is a sectional view taken along the line AA in FIG. 1 showing the structure of a hose feeding / winding device in the power atomizer, and FIG. FIG. 4 is an enlarged sectional view of a portion B in FIG. 2 showing the vicinity of the delivery roller 1, and FIG. 5 is an electromagnetic section for restricting free rotation and free rotation of the hose reel 2. FIG. 3 is an enlarged sectional view of a portion C in FIG. 2 illustrating a positional relationship between a brake 3 and a one-way clutch 4.

The power sprayer of this embodiment is put on a truck or the like together with a chemical tank and placed near a paddy field, a vegetable field, a greenhouse, an orchard, etc., and sprayed with high-pressure water mixed with a pesticide from a drawn-out hose to control. do. This power sprayer has an engine 6, a spray pump 7, a hose reel 2, and a delivery roller 1 arranged in a frame 5 as shown in FIG. The hose 8 is wound around the hose reel 2,
The extended end is wound around the feed roller 1 by one turn and 1/4 and pulled out. The hose reel 2 and the delivery roller 1 constitute a hose delivery / winding device. The frame 5 is provided with a handle 9 for an operator to push or pull when the power sprayer moves. The power sprayer is equipped with an antenna 10 and a receiver 11 so that an operator can wirelessly control the sending and winding of a hose by a transmitter (not shown).

The rotational force from the engine 6 is transmitted to a take-up drive shaft 13 using a V-belt 12, and the hose reel 2 is connected to the take-up drive shaft 13 via an electromagnetic clutch 14. When the worker sends a winding start signal from the transmitter, the electromagnetic clutch 14 connects the hose reel 2 and the winding drive shaft 13, and rotates the hose reel 2 in the reverse direction to start winding the hose 8.

As shown in FIGS. 1 and 2, a reciprocating traversing device (traverse device) 15 that moves integrally with the delivery roller 1 is disposed above the hose reel 2. The feed device 15 is linked with a chain 16. The reciprocating lateral feeder 15 repeats a reciprocating movement right and left in accordance with the traverse shaft 17 when sending and winding the hose 8, and sends out the hose 8 wound neatly on the hose reel 2 from the wound position. So that the hose 8 can be wound up neatly.

The hose 8 is guided from the reciprocating traversing device 15 to each guide roller 18 and is guided to the delivery roller 1. As shown in FIGS. 3 and 4, the delivery roller 1 has a substantially pulley shape having a groove width larger than twice the outer diameter of the hose 8.
The hose 8 suspended by one turn and 1/4 is passed through the hose guide roller 19 and pulled out substantially horizontally. A spray nozzle 20 is attached to the end of the hose 8 so that an operator can adjust the spray mode. As shown in FIG. 1, a hose guard 21 is provided above the engine 6 to prevent the hose 8 passing above the engine 6 from loosening and coming into contact with the engine 6 and causing heat loss.

The rotation of the hose reel 2 in the winding direction of the hose 8 is suppressed by the pulling force of the hose 8 between the hose roller 2 and the delivery roller 1. is there. In this example, as shown in FIGS. 2 and 5, the sprocket 22 of the electromagnetic brake 3 which is operated by switching between energization and cutoff is connected to the sprocket 23 of the hose reel 2 by a chain 24, and the hose reel 2
Is indirectly braked. The electromagnetic brake 3 is of a negative operation type, and the brake is applied to the hose reel 2 only when the power is supplied. When the hose 8 is delivered, the electromagnetic brake 3 is energized to allow the hose reel 2 to rotate freely. However, in all other cases, the power is cut off and the electromagnetic brake 3
However, since the hose 8 causes the hose reel 2 to brake in the sending direction, the free rotation of the hose reel 2 is suppressed,
The loosening of the hose 8 is prevented. The braking by the electromagnetic brake 3 also has a function of restricting the free rotation of the hose reel 2 due to vibrations during the movement of the power sprayer and preventing the hose 8 from being loosened.

As shown in FIG. 5, the electromagnetic brake 3 is connected to the sprocket 22 via the one-way clutch 4, and when the hose reel 2 rotates in the delivery direction, the braking by the electromagnetic brake 3 works. The hose reel 2 can be freely rotated in the winding direction. Thereby, when winding the hose 8, it is not necessary to energize to release the braking of the electromagnetic brake 3,
Power consumption can be reduced. In the power atomizer of this example, the specification for suppressing the battery consumption as described above is particularly preferable because the electric actuation parts are frequently used.

Next, the feeding or winding of the hose 8 by the hose feeding / winding device of this embodiment will be described. First, in a state where the engine 6 is started (it functions even if it is not started, but the power of the battery is consumed), the motor 25 is operated by the operation of the transmitter to rotate the sending roller 1 forward. When the operator pulls the hose 8 in the delivery direction of the hose 8, the hose 8 suspended around the delivery roller 1 is strongly pressed against the groove bottom of the delivery roller 1 and is delivered according to the rotation of the delivery roller 1. In addition, the electromagnetic brake 3 is energized in conjunction with the forward rotation of the delivery roller 1, and the braking of the hose reel 2 is released. When the worker finishes pulling out the hose 8 of a predetermined length, a stop signal is transmitted using the transmitter, the motor 25 is stopped, and the delivery of the hose 8 is stopped. At the same time, the power supply to the electromagnetic brake 3 is cut off, and the hose reel 2 is braked.
The inertia rotation of the hose reel 2 is prevented, so that the hose 8 does not loosen.

When the worker suspends the drawing of the hose 8 without issuing a stop signal from the transmitter, the pulling force applied to the hose 8 is reduced, and the pressing of the hose 8 against the delivery roller 1 is reduced. Then, the delivery of the hose 8 by the delivery roller 1 is interrupted. Further, as shown by a two-dot chain line in FIG. 3, the diameter of the hose 8 is expanded, so that the sensor plate 27 which is mounted on the guide plate 26 is pushed down, and the micro switch 28 is turned off to stop the motor 25. This avoids a situation in which the delivery roller 1 and the hose 8 rub against each other. At the same time, the electromagnetic brake 3 is actuated, and the hose reel 2 is braked to prevent the hose 8 from becoming loose. Since the sensor plate 27 is urged in the push-up direction by the spring 29, if the operator pulls the hose 8 to reduce the diameter, the microswitch is again turned on.
28, the motor 25 is restarted to rotate the delivery roller 1 forward, and at the same time, the electromagnetic brake 3 is energized,
Release the braking.

The driving source for rotating the delivery roller 1 forward includes:
Low rotation and high torque are required. Therefore, in the present embodiment, the small high-speed DC motor 25 is decelerated and the torque is increased by the motor reduction unit 30 to rotate the delivery drive shaft 31 so that the delivery roller 1 can be rotated at low rotation and high torque. As shown in FIG. 4, the delivery drive shaft 31 and the delivery roller 1 are connected via a one-way clutch 32, and only the delivery drive shaft 31 that rotates forward with respect to the delivery roller 1 is the only one. And is adapted to be engaged. Thus, even when the motor 25 is stopped, the sending roller 1 that normally rotates can rotate in the reverse direction, that is, freely rotate, relative to the stopped sending drive shaft 31, and the hose 8 can be pulled out.

The winding of the hose 8 is carried out by transmitting a winding signal from the transmitter, operating the engine 6, bringing the electromagnetic clutch 14 into the connected state, and rotating the hose reel 2 in the reverse direction. When the winding drive shaft 13 and the hose reel 2 are not connected via the one-way clutch 4, the braking by the electromagnetic brake 3 must be released. You can use the braking effect.

Since the winding of the hose 8 is mainly carried out by the hose reel 2, the pulling force of the hose 8 between the feeding roller 1 and the hose reel 2 is increased, and the feeding roller 1 rotates in reverse according to the hose 8 to be wound. Will be forced to do so. At this time, if the delivery drive shaft 31 and the delivery roller 1 are engaged with each other, for example, the above-described motor deceleration unit 30 or the like becomes a resistance, which may hinder the winding of the hose 8 or the durability of the hose 8 Can also have a negative effect. In this example, the motor 25 is rotated in the reverse direction when the hose 8 is wound, and the rotation speed of the delivery roller 1 is set to the winding speed of the hose 8 (normally, the hose reel 2 has a constant rotation speed. The winding speed of the motor 25 is controlled so that the winding speed of the motor 25 increases as the winding radius of the hose 8 with respect to the hose reel 2 increases. Under such circumstances, the delivery roller 1
Is rotated in the reverse direction, the delivery drive shaft 31 rotates forward with respect to the delivery roller 1, and the one-way clutch
As a result, the delivery roller 1 can be kept substantially free to rotate. For this free rotation, the reverse rotation speed of the delivery drive shaft 31 may be faster than the rotation speed of the delivery roller 1 following the winding of the hose 8. The DC motor 25 has a characteristic that the number of rotations is increased up to about 30% at the time of a small load, and if the rotation of the delivery drive shaft 31 is constantly adjusted to the winding speed of the hose 8, the above-mentioned requirement (the The rotation speed of the delivery roller 1 following the winding operation <the reverse rotation speed of the delivery drive shaft 31) can be satisfied.

[0029]

The hose feeding / winding device of the present invention has the following effects. First, wear and damage of the hose due to friction between the hose and the delivery roller are reduced, and the durability of the hose is improved and the delivery of the hose is ensured. Further, when the worker stops pulling, the diameter of the hose is detected to stop the delivery drive shaft, and the forward rotation of the delivery roller is interrupted, so that unnecessary friction between the hose and the delivery roller can be prevented. This also increases the durability of the hose. Second, according to the operator's pull,
The hose can be appropriately sent out, and in particular, the hose can be sent out according to the walking speed of the worker.

Third, in order to accurately detect the presence or absence of the pull of the worker in a mode such as expansion and contraction of the hose, the worker walks the hose while pulling the hose at a speed lower than the hose sending speed, for example. Also in the case of pulling out, the delivery roller intermittently sends out the hose in accordance with the expansion and contraction of the hose, so that the hose can be smoothly sent out without being loosened and entangled. This is an effect that appears more as the hose is pulled out longer, meaning that the worker can send out an appropriate hose according to the pull of the worker without worrying about the state of the hose in the power sprayer. I do.

Fourth, the delivery drive shaft and the delivery roller, and the take-up drive shaft and the hose reel are each connected by a one-way clutch. Thus, even if each drive shaft cannot rotate, the hose can be sent and wound. This means that while the present invention realizes the delivery of the hose to the hose delivery / rewinding device according to the pull of the operator,
This means that the hose can be sent out and taken up in case of emergency, indicating that the convenience is generally improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire power atomizer to which the present invention is applied.

FIG. 2 is a sectional view taken along the line AA in FIG. 1 showing a structure of a hose delivery / rewinding device in the power sprayer.

FIG. 3 is a partially broken side view showing the vicinity of a delivery roller.

FIG. 4 is an enlarged sectional view of a portion B in FIG. 2 showing the vicinity of the delivery roller.

FIG. 5 is an enlarged sectional view of a portion C in FIG. 2 showing a positional relationship between an electromagnetic brake and a one-way clutch for restricting free rotation and coasting rotation of the hose reel.

[Explanation of symbols]

 Reference Signs List 1 delivery roller 2 hose reel 3 electromagnetic brake 4 electromagnetic brake one-way clutch 5 frame 6 engine 7 spray pump 8 hose 13 winding drive shaft 14 electromagnetic clutch 22 electromagnetic brake sprocket 23 hose reel sprocket 24 chain 25 motor 26 guide plate 27 Sensor plate 28 Micro switch 31 Delivery drive shaft 32 One-way clutch for delivery drive shaft

Claims (5)

[Claims] 1. A hose reel that engages with a winding drive shaft that rotates in a reverse direction to wind up a hose, and feeds out a hose that is engaged with a feed rotation shaft that rotates in a forward direction and extends from the hose reel and is hung. In a hose feeding / winding device which feeds or winds a hose attached to a power sprayer, the hose reel is connected to a winding drive shaft so that the hose can rotate freely when the hose is fed, and the feeding roller is a hose. A substantially pulley shape having a groove width larger than twice the outer diameter of
Connect the hose extended from the hose reel to the delivery roller
A hose delivery / rewinding device in a power sprayer, wherein the hose is wound over a number of turns. 2. A hose reel that engages with a winding drive shaft that rotates in a reverse direction to wind up a hose, and feeds out a hose that is engaged with a feed rotation shaft that rotates in a forward direction and extends from the hose reel and is hung. A hose feeding / rewinding device that feeds or winds a hose attached to a power sprayer, the sensor being configured to detect that the hose has expanded in the radial direction of the feeding roller due to a change in tension applied to the hose. Arranged in the vicinity of the hose suspended around the delivery roller, the sensor stops the forward rotation of the delivery roller when the sensor detects a diameter increase of the hose, and the forward rotation of the delivery roller when the sensor detects the diameter reduction of the hose. Hose feeding / rewinding device in a power sprayer characterized by restarting. 3. A hose reel that engages with a winding drive shaft that rotates in a reverse direction to wind up a hose, and feeds out a hose that is engaged with a feed rotation shaft that rotates in a forward direction and extends from the hose reel and is hung. In a hose feeding / rewinding device which feeds or winds a hose attached to a power sprayer, the feeding drive shaft which rotates forward with respect to the feeding roller is engaged with the feeding roller. Both are connected via a one-way clutch, and are driven at a rotation speed higher than the rotation speed of the delivery roller that reversely rotates in accordance with the winding of the hung hose so that the delivery roller is substantially free to rotate at the time of winding the hose. A hose delivery / rewinding device in a power sprayer characterized by driving a shaft in reverse. 4. A one-way clutch is provided so that the take-up drive shaft, which rotates relatively positively with respect to a negative-acting type electromagnetic brake that operates in conjunction with the stop of the delivery drive shaft, engages with the electromagnetic brake. When the hose is delivered, the electromagnetic brake is energized to release the brake and allow the hose reel to rotate freely.When the hose is not sent and taken up, the electromagnetic brake is shut off. 4. The power sprayer according to claim 1, wherein the take-up drive shaft that attempts to rotate forward is braked to hold the hose reel engaged with the take-up drive shaft. Hose delivery / rewinding device. 5. The hose delivery / rewinding device according to claim 1, wherein the drive source of the delivery drive shaft is a DC motor.