JPH0568697A - Electric bed motor drive control system - Google Patents

Abstract

(57) [Summary] [Purpose] The status display means prevents erroneous operation and ensures safe operation of the electric bed. [Structure] An operation command signal is sent from an operation switch box 6 to a back raising motor 2, a knee raising motor 3 and a floor raising / lowering motor 4 via a controller 5 to adjust the displacement of the floor and the like. For example, in the knee raising motor 3,
The limit switch 7 and the rotation sensor 8 are provided, and an operation start / stop signal is sent from the limit switch 7 and a detection signal corresponding to the rotation amount of the motor 3 for raising the knee of the motor is sent from the rotation sensor 8 to the controller 5, respectively. .. The operation switch box 6 includes operation switches SW1 to SW6.
And a status display means 17 in which a plurality of light emitting diodes (LEDs) are linearly arranged. [Effect] The bed state display means allows the user to instantly and easily check how much the bed is in a state, so that an operation error can be prevented and the safety is remarkably improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive control system for an electric bed.

[0002]

2. Description of the Related Art Conventionally, in an electric medical bed, an operation switch box provided with an operation switch is provided at the patient's hand in order to electrically move and adjust the floor and other components constituting the bed. There is one in which the patient can operate the switch box himself. Such a function of moving and adjusting by electric power is very effective for a patient to have a comfortable bed life, and also for a caregiver because the labor for nursing is reduced. The floor and the like are constructed so that they can be raised and lowered and adjusted up and down within a certain range, and as a limiting operation means therefor, an upper and lower limit switch is provided in the motor or the bed body to start / stop the on / off operation thereof. As a signal, a configuration for driving and stopping the motor has been adopted.

[0003]

In the case of such a bed, it is difficult for the patient to completely understand the current state of the bed, and there is concern that it may cause an operation error or an accident. To be done. Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide a bed state display means to provide a safe motor drive control system for an electric bed without erroneous operations or accidents.

[0004]

In order to solve the above-mentioned problems, the present invention provides a motor as a drive source and a controller for controlling the drive of the motor in an electric bed for electrically adjusting the position of a floor or the like. And an operation switch box provided with a plurality of operation switches for selecting and commanding the operation of the floor part, etc., the motor includes a rotation sensor on the output shaft via a rotation transmission mechanism, and a specific rotation of the output shaft. A limit switch for detecting the position, the operation switch box has a state display means for displaying the operating state of the floor, etc., the controller, the signal from the limit switch and the detection signal from the rotation sensor Based on the above, the current operating state of the floor etc. is judged, a drive control signal is sent to the motor, and a state display signal is sent to the state display means of the operation switch box. Characterized in that it is obtained by adapted to deliver. The rotation transmission mechanism includes a worm attached to the output shaft of the motor, a worm wheel meshed with the worm and having a sensor shaft as a rotation shaft of a rotation sensor inserted therethrough, and a cam attached to the sensor shaft. The limit switch is arranged at a position where the operating piece of the limit switch is operated by the projecting edge portion of the cam. Further, the status display means is composed of a plurality of light emitting diodes.

[0005]

When the operation switch of the operation switch box is operated, the motor is driven and the floor or the like forming the bed is displaced. In this case, when the floor of the bed is displaced from the lower limit position of operation, the operating piece of the limit switch is released from the ridge of the cam by the rotation of the motor, and a start signal is issued. Detection is started and a detection signal corresponding to the rotation amount is taken out, the current floor condition is judged based on these signals, and a status display signal is sent from the controller to the status display means of the operation switch box. Then, the display corresponding to the position of the floor is made. Therefore, by visually observing the status display means, the current position of the floor portion can be easily confirmed, so that troubles such as malfunction and excessive operation can be avoided. Also, the floor part is operated to return it to its original position, the motor is rotated, and the sensor shaft is rotated from the output shaft of the motor through the rotation transmission mechanism. Then, the stop command signal for the motor is taken out as the floor has reached the operation lower limit position, is sent to the motor, and the motor is stopped.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric bed motor drive control system according to the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 indicates an electric bed for electrically adjusting the position of a floor or the like. The electric bed 1 has functions of raising the back, raising the knees, and raising / lowering the floor height. The motor 2 for raising the back, the motor 3 for raising the knee, and the motor 4 for raising and lowering the floor are provided.

The back raising motor 2, knee raising motor 3 and floor raising / lowering motor 4 send a controller 5 for drive control and an operation command signal to the controller 5 and operate the floor or the like. Is electrically connected to an operation switch box 6 for issuing a command. Here, taking the knee raising motor 3 as an example, the controller 5
And considering the relationship with the operation switch box 6,
This will be described below. That is, the knee raising motor 3 includes a limit switch 7 and a rotation sensor 8. The limit switch 7 detects an operation start / stop signal (on / off signal) and the rotation sensor 8 detects a rotation amount of the motor knee raising motor 3. Each signal is sent to the controller 5.

The controller 5, based on the signal from the limit switch 7 and the detection signal from the rotation sensor 8,
The current operation state of the floor or the like is determined, and a drive control signal is sent to the mechanism section 9 of the knee raising motor 3 and a state display signal is sent to the state display means (described later) of the operation switch box 6. It was done. That is, in the controller 5, the operation start / stop signal from the limit switch 7 is taken in via the input / output interface (I / O) 10, and the detection signal (analog signal) from the rotation sensor 8 is introduced into the AD converter 11. Is converted into a digital signal, the CPU 12 performs arithmetic processing, and an operation command is transmitted via the drive unit 13 to the mechanical unit 9 of the knee raising motor 3.
An operation procedure for performing drive power supply / interruption control is executed. The controller 5 also operates the operation switch box 6 via the input / output interface 14.
The procedure for transmitting the display signal corresponding to the detection signal from the rotation sensor 8 to the state display means (described later) of the operation switch box 6 is executed while the operation command signal from the control switch box 6 is captured. Reference numeral 15 is a ROM and 16 is a RAM.

The operation switch box 6 is provided with operation switches SW1 to SW6 and status display means. The operation switch SW1 is a switch for raising the back, and the operation switch S
W2 is for lowering the back, operation switch SW3 is for raising the knee, operation switch SW4 is for lowering the knee, operation switch SW5 is for raising the entire floor, and operation switch SW6 is for the floor. It is for lowering the whole section.
Further, the operation switch box 6 is provided with a status display means 17 in which a plurality of light emitting diodes (LEDs) are linearly arranged, and a light emission display corresponding to the degree of operation is performed.

Next, the limit switch 7 and the rotation sensor 8 provided on the knee raising motor 3 will be described with reference to FIG.
The mounting structure is shown in and explained. That is, the rotation sensor 8 is provided on the output shaft 19 of the knee raising motor 3 via the reduction gear mechanism 18. The reduction gear mechanism 18 is
A worm 20 coaxially attached to the output shaft 19,
The worm wheel 21 meshes with the worm 20, and the sensor shaft 22 of the rotation sensor 8 penetrates the worm wheel 21. Further, a cam 23 is attached to the tip of the sensor shaft 22, and the protruding edge portion 2 of the cam 23 is attached.
A limit switch 7 is provided so as to come into contact with 4. That is, the position at which the projecting edge portion 24 of the cam 23 contacts the actuating piece 25 of the limit switch 7 by the rotation of the output shaft 19 is set to the operation lower limit position (see FIG. 3).

The motor drive control system for the electric bed according to the present invention is constructed as described above, and its operation will be described below. When the operation switches SW1 to SW6 of the operation switch box 6 are operated, the knee raising motor 3 is driven, and the floor and the like forming the bed are displaced. In this case, when the floor of the bed is displaced from the lower limit position of movement,
The limit switch 7 is rotated by the rotation of the knee raising motor 3.
The operating piece 25 is released from the projecting edge portion 24 of the cam 23 and issues a start signal, the rotation sensor 8 starts detecting the rotation amount of the knee raising motor 3, and the detection signal corresponding to the rotation amount is extracted. , The current state of the floor is determined based on these signals, and the controller 5 sends the operation switch box 5
A status display signal is sent to the status display means 17 and a display corresponding to the status of the floor is made. Therefore, by visually observing the state display means 17, the current state of the floor portion can be easily confirmed, and troubles such as malfunction and excessive operation can be avoided.

When the operation is performed to return the floor to its original position and the operating piece 25 of the limit switch 7 is acted by the projecting edge 24 of the cam 23, the stop signal of the knee raising motor 3 is taken out as the lower limit signal. As a result, a stop control signal is sent to the knee raising motor 3 and the knee raising motor 3
Will stop.

As described above, since the knee raising motor 3 drive control system operates, the patient can easily know the bed condition, that is, the floor condition by the light emitting display. You can prevent mistakes.

In the event of a power failure, the output shaft 19 of the knee-raising motor 3 is manually rotated and then restored, the output shaft 19 at that time, that is, the sensor shaft 2
Since the rotation sensor 8 can detect the rotation position of 2 as the rotation amount, there is no problem and it is possible to sufficiently cope with an emergency.

[0015]

As described above, according to the present invention, it is possible to immediately and easily confirm the state of the bed by means of the bed state display means, so that it is possible to prevent an operation error or the like. , The safety is greatly improved.

[0016]

[Brief description of drawings]

FIG. 1 is a schematic block diagram for explaining a motor drive control system for an electric bed according to the present invention.

FIG. 2 is an external perspective view of a motor of an electric bed according to the present invention.

FIG. 3 is an exploded perspective view showing the essential parts of the motor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric bed 2 Motor for raising back 3 Motor for raising knee 4 Motor for raising / lowering floor 5 Controller 6 Operation switch box 7 Limit switch 8 Rotation sensor 9 Mechanism section 10, 14 Input / output interface 11 AD converter 12 CPU 13 Drive section 15 ROM 16 RAM SW1 to SW6 operation switch 17 status display means 18 reduction gear mechanism 19 output shaft 20 worm 21 worm wheel 22 sensor shaft 23 cam 24 projecting edge 25 working piece

Claims (3)

[Claims] 1. In an electric bed for electrically adjusting the position of a floor or the like, a motor as a drive source, a controller for controlling the drive of the motor, and a plurality of operation switches for instructing the operation of the floor or the like. An operation switch box provided with, the motor, the output shaft via a rotation transmission mechanism, a rotation sensor, and a limit switch for detecting a specific rotational position of the output shaft, the operation switch box, floor A state display means for displaying the operating state of the parts, etc., the controller, based on the signal from the limit switch and the detection signal from the rotation sensor, to determine the current operating state of the floor, etc., the motor An electric bed characterized by transmitting a drive control signal and a state display signal to the state display means of the operation switch box. Motor drive control system. 2. The rotation transmission mechanism according to claim 1, wherein a worm attached to the output shaft of the motor, a worm wheel meshing with the worm and having a sensor shaft as a rotation shaft of a rotation sensor inserted therethrough, and the sensor. A motor drive control system for an electric bed, comprising a cam mounted on a shaft, wherein the limit switch is arranged at a position where an operating piece of the limit switch is operated by a ridge of the cam. 3. The motor drive control system for an electric bed according to claim 1, wherein the status display means comprises a plurality of light emitting diodes.