JPH01102608A - Computer sheet device - Google Patents

Abstract

PURPOSE:To attain highly accurate position setting/controlling job computer sheets by connecting a variable resistance in series to a potentiometer which detects the positions of each area of the computer sheets so that the characteristics of the potentiometer can be freely controlled. CONSTITUTION:A variable resistance VR is connected in series to a potentiometer PM which detects the positions of each area of the computer sheets. Then the value of the resistance VR is controlled so that the relation between the moved position of each area of the computer sheet and the output voltage is controlled. When the value of the resistance VR is changed, the current flowing to the PM is changed. Thus the voltage obtained from the PM has a change of its level. This voltage is read into a microcomputer 1 as a position detecting signal which represents the moved position of each area of the sheet. As a result, the position of the computer sheet is set and controlled with high accuracy even though the potentiometer has its characteristic variance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a computer seat device in which the position of each part of the seat can be moved to a predetermined position or a desired position with the help of a computer. More specifically, the present invention relates to an improvement in the number of adjustment steps when a potentiometer is used as a position detecting means for detecting the moving position of each part of a seat.

(Prior Art) Some furniture chairs are required to be able to adjust the seat position easily and accurately. For these reasons, computer seat devices have been proposed in recent years that utilize the power of microcomputers to accurately adjust the positions of various parts of the seat.

In conventional computer seat devices of this type,
A potentiometer is used to detect the position of each part, and the voltage signal obtained from it is sent to a microcomputer via an A/D converter. It is configured to return IJ.

(Problems that +A Ming attempts to solve) In the conventional device with such a configuration, the performance 1 quality of the potentiometer directly affects the position detection accuracy and determines whether each part of the seat can be adjusted accurately. Until now, there has been a problem in that a potentiometer with high precision and uniform characteristics must be used as a potentiometer.

The present invention has been made in view of these problems, and its purpose is to provide a computer seat device that can perform position setting and adjustment with high accuracy even if there are variations in the characteristics of potentiometers. It's about doing.

(Means for Solving the Problems) The present invention, which solves the above problems, adjusts and sets the position of each part of the seat using control signals output from a microcomputer, and detects the moving position of each part. In a computer sheet device in which a signal from a potentiometer is read into the microcomputer, a variable resistor is connected in series with the potentiometer, and the value of the variable resistor is am, so that the moving position of each part and the output voltage can be determined. It is characterized by adjusting the relationship between

(Function) When the value of the variable resistor is changed, the current flowing through the potentiometer changes, and the voltage obtained from the potentiometer changes. This voltage is read into the microcomputer as a position detection signal representative of the moving position of each part of the sheet. , (Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram of the overall configuration of the apparatus of the present invention. In this case, 1 is a microcomputer with a memory ME, and 2 is an operation panel connected to the microcomputer 1. This includes instruction switches SW1 to SW6 for instructing the movement of each part of the seat, and positions at predetermined positions.・Memory key MKY for instructing data to be stored in memory ME
, a reproduction key RKY is provided for moving each part of the sheet based on position data stored in the memory ME.

DR1-DR3 are motor drivers which receive control signals from the microcomputer 1 and drive the respective motors M1-M3. Motor M1 is seated here, S T
The motor M2 moves the head part of the seat ST.
The motor M3 is configured to move the backrest portion (reclining portion) of the seat ST, and the motor M3 is configured to move the foot portion (ottoman portion) of the seat ST.

PM1 to PM3 are all potentiometers that detect the moving position of each part, and are mechanically coupled to each part and output a voltage signal corresponding to the moving position.

AD1 to AD3 are A10 converters that convert signals from each potentiometer PM1 to PM3 into digital signals,
Here, the converted digital signal is fed back to the microcomputer 1. It should be noted that only one A/D converter is required if the signals from the potentiometers PM1 to PM3 are switched and inputted using a multiplexer and shared by each signal.

FIG. 2 is a connection factor showing details of the vicinity of the potentiometer PM. In the figure, Vcc is a stabilized straight line 5! voltage and the resistance RE that constitutes the potentiometer PM
This DC voltage Vcc is applied to I (between terminals A and C) via variable resistor VR and resistor Re. Also, resistance R
Although the brush (terminal B) of P is not shown, it is mechanically connected to the rotating shaft or moving shaft of each part of the sheet, so that the partial pressure point of the resistor Rp moves as each part moves. Thus, a voltage V expressed by equation (1) corresponding to the moving position of the part can be obtained from the terminal B.

V-(α-(Rp/Re +VR+Rp))-Vc
c...(1) However, α is the ratio (Raa/R1) between the resistance Rp of the terminal ACIII and the resistance Rac between the terminals 80, and represents the movement position of each part of the sheet.

The voltage V obtained from the potentiometer P″M and expressed by equation (1) is applied to the A/D converter AD via the resistors RL and R2.
is applied to Note that Dl and D2 are diodes for setting upper and lower limits connected between the power supply line Vcc and common, and C is a capacitor, which are not necessarily required.

FIG. 3 is a miniature diagram showing the relationship between the rotational position of the brush in the potentiometer PM (corresponding to the movement position of each part of the sheet) and the output voltage V.

This characteristic is expressed by equation (1), and the output voltage V for the moving position can be easily adjusted by changing the variable resistor VR. That is, if the value of the variable resistor VR is made thicker, the characteristic curve changes so that the slope becomes smaller as shown by the broken line a, and the slope becomes larger as shown by the broken line a.

Therefore, even if the values of the resistors Rp used in the potentiometer PM are not the same, the variable resistor V
By adjusting the value of R, desired characteristics can be easily obtained.

In the device configured as described above, when moving each part of the eight seats, the user sits on the seat and presses any of the instruction switches SW1 to SW6 on the operation panel 2 while checking the comfort of the seat.

For example, when it is desired to move the head portion of the seat ST in the direction of arrow a, the switch SW1 is pressed. When the microcomputer receives the instruction signal from this switch SW1,
For example, the motor M1 is rotated clockwise via the motor driver DR1 to move the head portion in the direction of arrow a. When the switch SW1 is released from the press, the rotation of the motor M1 is stopped, and the movement of the seat head is also stopped. Here, since the movement of the seat head portion moves the railing of the potentiometer PM, a voltage corresponding to the movement position is obtained from the potentiometer PM1 and read into the microcomputer 1 via the A/D converter AD1.

Therefore, the potentiometers obtained from each of the potentiometers PMI to PM3 can be stored in the memory ME via the microcomputer 1 by pressing the memory key MKY on the operation panel 2. Further, each position data stored in the memory ME can be read out from the memory ME by pressing the reproduction key RKY, and the position of each part of the sheet ST can be moved and set. At this time, microcomputer 1.
A servo loop is formed including the motor M and potentiometer PM, so the movement position of each part is determined by the position.
It can be accurately moved and set to a predetermined position according to the data.

In the above explanation, 3121 parts of the seat ST can be adjusted, but by further increasing the number of motors and the number of potentiometers, each part of the seat can be adjusted finely. .

(Effects of the Invention) As explained in detail above, the present invention connects a variable resistor in series with a potentiometer that detects the position of each part of the seat, and allows the characteristics of the potentiometer to be freely adjusted by this variable resistor. It is something. According to the present invention, even if there are variations in the characteristics of the potentiometer, the characteristics can be easily adjusted. Therefore, it is possible to realize a computer seat device that can perform position setting bow I with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the overall configuration of the device of the present invention, FIG. 2 is a diagram showing electrical connections near the potentiometer, and FIG. 3 is a diagram showing the relationship between the rotational position of the potentiometer and the output voltage. 1...Microcomputer 2...Operation panel ST...Sheets M1 to M3
...Motor DR1-DR3...Motor driver ME...Memory, PM1-PM3-...Potentiometer VR...
・Variable resistors AD1 to AD3... - A/D converter patent applicant Shiraki Metal Industry Co., Ltd. Agent Patent attorney Fuji Ijima Jigai 1 person

Claims (1)

[Claims] The position of each part of the sheet is adjusted and set by a control signal output from a microcomputer, and the microcomputer is made to read a signal from a potentiometer that detects the moving position of each part. In the computer seat device according to the present invention, a variable resistor is connected in series to the potentiometer, and the relationship between the moving position of each part and the output voltage is adjusted by adjusting the value of the variable resistor. sheet equipment.