JPS637783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic chair in which past set position data is stored in a storage element (memory) and an actuator is automatically operated based on a comparison result between the set position data and current position data.

Automatic dental chairs are being developed in which past set position data is stored in a storage element (memory) and an actuator is automatically operated based on a comparison result between the set position data and current position data.

Incidentally, in such an automatic chair, a read command signal and a write command signal are required in order to input and output information to and from the memory. Therefore, from a functional point of view, it is sufficient to simply provide a manual switch that sends a read command signal to the automatic chair and a manual switch that sends a write command signal. If the manual switch that sends the message is touched by mistake,
This is a very dangerous situation because the contents of the memory will be updated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an automatic chair with a memory in which the stored contents are not updated even if a memory switch for issuing a write command is accidentally touched.

According to the invention, this objective is based on the height of the seat;
The detected value of at least one of the degree of inclination and the amount of tilting of the backcrest is converted from analog to digital, the information is stored in a memory by a write command, and the information is read by a read command given to the memory. In an automatic chair that controls an actuator driver based on a comparison result between set position data and A-D converted current position data, a position switch that, when manually operated, specifies the address of the memory and generates a read command signal; , and a memory switch which, together with the position switch, produces a write command signal provided that it is simultaneously operated manually.

Hereinafter, details of one embodiment of the present invention shown in the drawings will be described.

FIG. 1 shows the structure of an automatic chair according to the present invention. A movable base 3 is supported on a base 1 so as to be movable up and down by parallel links 2A and 2B.
The height is driven and controlled by the vertical motion device 4.
A seat 6 tiltably supported by a shaft 5 is positioned on the movable base 3, and the seat 6 relative to the movable base 3 is
One direction is controlled by a tilt actuator 7. A backrest 8 that can be raised and lowered relative to the seat 6 is supported on the shaft 5, and the raising and lowering of the backrest 8 can be controlled by a backrest actuator 9. These vertical motion devices 4,
Although the tilt actuator 7 and the backrest actuator 9 are shown as hydraulic cylinder devices, other actuators such as electric motors may be used in the present invention.

The vertical operating device 4, tilt actuator 7, and backrest actuator 9 are respectively controlled by a lift driver 4A, a tilt driver 7A, and a backrest driver 9A shown in FIGS. 2 and 3. These lift driver 4A, tilt driver 7A, and backrest driver 9A are connected to a lift solenoid 4 built into a pressure oil directional control valve.
A1, lowering solenoid 4A2, tilt-down solenoid 7A1, tilt-up solenoid 7A
2. A backup solenoid 9A1 and a backup solenoid 9A2 are provided, and each actuator is controlled by selective excitation of these solenoids.

Returning to Figure 1, on the side of the back crest 8,
Lift knob L-SW, tilt knob T-SW, back knob B-SW, position knob P- for specifying memory address that can be operated with your fingertips.
SW, a reset switch R-SW for returning each of the actuators 4, 7, and 9 to their initial positions, and a memory switch M-SW for memory writing. Each of the lift knobs L-SW, tilt knobs T-SW, back knobs B-SW, and position knobs P-SW are as follows:
Make contacts L-SW ₁ , L-SW ₂ , make contacts T-SW ₁ , T- which can be selectively closed by manual operation
SW ₂ , make contacts B-SW ₁ and B-SW ₂ .

As shown in FIGS. 2 and 3, the automatic chair according to the present invention includes a lift detector 3A that detects the amount of rise of the movable base 3, that is, the seat 6, and a tilt detector that detects the amount of the seat 6 oriented in one direction. 6A, and a back detector 8A for detecting the amount of tilting of the backrest 8 with respect to the seat 6. It can be a sliding resistor as shown in FIG. These lift detectors 3
A, tilt detector 6A, and back detector 8A generate analog signals having levels L ₁ , L ₂ , and L ₃ proportional to their detected amounts, as shown in FIG. 4 a, b, and c, respectively. However, these output signals are input to the input terminal of the multiplexer _M1 of the data signal synthesis circuit 10. The output pulses of the timing pulse generating circuit 11 are supplied to the three clock terminals of the multiplexer _M1 . That is, the timing pulse generation circuit 11 includes a clock pulse generator and a flip-flop FF ₁ , and these output signals are synthesized by three AND gates G ₁ to generate signals with different phases as shown in FIG. It emits three types of timing pulses. Therefore, in the data signal synthesis circuit 10, the levels L ₁ , L ₂ ,
An output signal having L ₃ in FIG. 4e is produced, and this output signal is input to the AD conversion circuit 12.

The clock terminal of the A-D converter circuit 12, which can use the 8700 element manufactured by TELEDYNE, has a fourth
The timing pulse shown in _FIG . f). That is, this digital output signal is the current position data A of the automatic chair, and this current position data A includes lift amount data A-
₁ , tilt amount data A- ₂ , and backrest 8 raising/lowering amount data A- ₃ . This current position data A is transmitted to a time division circuit 13 and a comparison circuit 14 to be described later.
is supplied to one input terminal of

The time division circuit 13 includes the above-mentioned A-D conversion circuit 1.
8 AND gates G 2 , G ₃ opened and closed by a monostable multi-FF ₂ driven by the output timing pulse of 2 and generating a timing pulse with a pulse width of _1/2 of said pulse width T ₁ Equipped with That is,
AND gate G ₂ , which receives the current position data A of the upper 4 digits, is opened and closed by the output of monostable multi-FF ₂ ,
Also, since the AND gate G ₃ which receives the current position data A of the lower three digits is opened and closed by the negative output of the monostable multi-FF ₂ , the four AND gates G 3 which receive the outputs of both AND gates G ₂ and G ₃ The NAND gate _G4 inputs the current position data A time-divided into the upper 4 bits and the lower 3 bits as shown in FIG. 4g to the data input terminal of the memory 15.

As the memory 15, for example, RCA's
A CD40114B memory element can be used. This memory element has a storage capacity of 16 8-bit words, and is clocked by the clock applied to the address input terminal.
Data input can be sequentially written to and read from specified addresses based on pulses. Also, memory 1
A voltage is applied to the power supply terminal 5 through a backup circuit 16. The backup circuit 16 has a built-in power source 17 and a switching transistor T, and this switching transistor T applies the voltage of the power source 17 to the power terminal of the memory 15 when the power source voltage disappears, and restores the memory 15's memory. hold.

The select input of the memory 15 is
Two input signals created by the timing pulse of , the output signal of the monostable multi-FF ₂ , and an addressing signal created by the make contacts P-SW ₁ and P-SW ₂ of the position knob P-SW are input. Thus, in the memory 15, an address page is designated by the closing of the make contact P-SW ₁ or P-SW ₂ , and the data at the address within this page is processed sequentially and automatically. and the monostable multi
A read command signal is generated by gate G ₄ ' based on the output signal of FF ₂ and the negative output signal, and the set position data B as shown in FIG. 4h is periodically read out by this read command signal.

A plurality of pieces of data read from the memory 15 (hereinafter referred to as set position data B) are transferred to the latch circuit 18 via the data bus. The latch circuit 18 has two latch elements R _{1 and} R ₂ that are latched by the output signal and negative output signal of the monostable multi-FF ₂ , respectively.
When the latch signal is applied, _R2 sends data of the upper four digit bits and the lower three digit bits of the input set position data B to the comparator circuit 14 in parallel.

The comparator circuit 14 has two arithmetic elements C ₁ and C ₂ to which corresponding bit-by-bit current position data A and set position data B are input in parallel and determine the magnitude of these data A and B. That is, when the current position data A is larger than the set position data B, the arithmetic elements C ₁ and C ₂ output a determination result signal as shown in FIG.
and set position data B are equal, the output line 21
When the current position data A is smaller than the set position data B, a determination result signal as shown in FIG. 4J is output to the output line 22, and a determination result signal as shown in FIG. The judgment result signal is transmitted to the lift driver 4A, the tilt driver 7A, and the backrest.
Latch circuit 23 that provides a control signal to the driver 9A
supplied to This latch circuit 23 is shown in FIG.
The latching elements R ₃ , R _{4 , R 5} are provided with the timing pulses 20, 2 as _the latching inputs.
A necessary result signal is temporally selected from 1 and 22 to control the lift driver 4A, tilt driver 7A, and backrest driver 9A.

The memory switch M-SW sends a trigger signal to the write signal generation circuit 24 through the gate _G5 , which operates on the condition that either the make contact P-SW ₁ or P-SW ₂ of the position knob P-SW is made. give. The flip-flop _FF3 of the write signal generation circuit 24 generates a write command signal based on the output signal of the gate _G5 , and applies the write command to the memory 15 via the OR gate _G6 . Therefore, when a write command is issued, current position data A is input to the address page designated by the position knob P-SW in the memory 15, and all data in this address page is updated. In addition, in the case of this write command, the memory switch M-
The signal from SW is the make contact PW ₁ or P-
It is input to the flip-flop _FF4 of the reset signal control circuit 25 by the gate _G7 , which operates on the condition that _SW2 is made. This flip flop
FF ₄ cuts off the output signal from the latch circuit 23 and prohibits the operations of the lift driver 4A, tilt driver 7A, and backrest driver 9A when the memory switch M-SW is made.

The reset signal control circuit 25 includes a flip-flop _FF5 operated by instantaneous making of the reset switch R--SW. This flip-flop FF ₅ has a reset switch R-
When SW is made, the flip-flop _FF4 is reset via the OR gate _G8 , and at the same time, the lowering solenoid _4A2 of the lift driver 4A,
The tilt-up solenoid 7A ₂ of the tilt driver 7A and the back-up driver 9A ₂ of the backrest driver 9A are energized to bring the automatic chair into its initial state.

The emergency stop circuit 26 has make contacts L-SW ₁ , L
-SW ₂ , T-SW ₁ , T-SW ₂ , B-SW ₁ , B-
It has a NAND gate G ₉ which is input with the output of SW ₂ ,
The output signal of this NAND gate _G9 is an OR gate _G8 that resets flip-flop _FF4 and an OR gate that resets flip-flop _FF5.
Entered into _G10 . Therefore, if the automatic chair is being moved towards a pre-stored set state or if it is being moved towards an initial state, the make contacts L-SW ₁ , L-SW ₂ , T
When any one of -SW ₁ , T-SW ₂ , B-SW ₁ , and B-SW ₂ is made, these moving operations are momentarily stopped in an emergency. Note that NAND gate _G11 is a gate for emergency stop of the automatic chair when a write command is issued during reset operation, and
AND gate _G12 is a gate that emergencyly stops the automatic chair when the reset switch R-SW is made again during the reset operation.

The operation of the automatic chair of the above embodiment is as follows.

Γ Automatic operation In this case, at least one of the lift knob L-SW, tilt knob T-SW, and back knob B-SW is manually operated. By this manual operation, the make contacts L-SW ₁ , L-SW ₂ , T-
Any one of SW ₁ , T-SW ₂ , B-SW ₁ , and B-SW ₂ is made, and this make directly commands the lift driver 4A, tilt driver 7A, and backrest driver 9A, The vertical actuator 4, the tilt actuator 7, and the backrest 8 are operated only during manual operation of each knob. Therefore, lift knob L-
SW, tilt knob T-SW, back knob B
- The automatic chair can be placed in any position by manual operation of the SW.

Γ Reset operation To return the automatic chair to its initial state when getting on and off a patient, press the reset switch R-
SW is manually operated. Reset switch R
- Due to the instantaneous make of the SW, the flip-flop FF ₄ is operated, and the lowering solenoid 4A ₂ , the tilt-up solenoid 7A ₂ , and the back-up solenoid 9A ₂ are energized simultaneously, the movable base 3 is lowered, and the seat 6 is almost The backrest 8 is returned to the horizontal state and erected. These movement movements cause the movable base 3, seat 6, and backrest 8 to reach their movable limits, and the lift driver 4
A. This continues until the limit switch built into the tilt driver 7A and backcrest solenoid 9A is opened.

Γ Posture memory operation In this operation, the automatic chair is set to the desired posture according to the procedure described in the manual operation explanation. Next, when the memory switch M-SW and the position knob P-SW are manually operated at the same time, the memory address of the memory 15 is specified by the make of the position switch P-SW ₁ or P-SW ₂ , and the memory address is written to the memory 15. The command is carried out. At the same time, the flip-flop of the reset signal control circuit 25 is activated by the above-mentioned manual operation.
FF ₄ operates, and the operations of lift driver 4A, tilt driver 7A, and backrest driver 9A are prohibited. Therefore, the current position data A given to the data input of the memory 15 is stored at the address designated by the select input.

Γ Set operation To set the automatic chair to a pre-memorized posture, only the position knob P-SW is manually operated. For example, when the make contact P-SW ₁ is made by the position knob P-SW, the set position data B in the address page of the memory 15 specified by the signal of the make contact P-SW ₁ is read out in order, and the latch is closed. The signal is input to the comparison circuit 14 through the circuit 18. Comparison circuit 14
Then, the current position data A of the automatic chair obtained from the AD conversion circuit 12 and the set position data B are compared. For example, if the height of the movable platform 3 is higher than the storage position, this comparison result signal is selected by the latch element R ₃ of the latch circuit 23;
An output signal _Q4 is output, and the lowering solenoid _4A2 is energized by this output signal _Q4 . In this way, the current position data A and the stored position data B are successively compared in the comparator circuit 14, and the vertical movement actuator 4, the tilt actuator 7, and the backrest actuator 9 are actuated, and the current position data A and the set position data are When the position data B become equal, the automatic chair stops.

Γ Emergency stop During the above-mentioned reset or set operation,
Lift knob L-SW, tilt knob T-SW,
Back knob B-SW, position knob P-
When either SW or reset switch R-SW is operated, the automatic chair will come to an emergency stop. Therefore, when the operator of the automatic chair feels danger, the automatic chair can be stopped immediately, so it is safe.

As is clear from the above description, according to the present invention, the position switches P-SW ₁ , P-
Since a write command signal is generated by memory switch M-SW on the condition that SW ₂ is manually operated simultaneously, even if memory switch M-SW is touched by mistake,
The contents of the memory 15 are never updated.
As a result, the stored contents are updated without the driver's knowledge, and the seat 6 and backrest 8 do not start moving in an unexpected direction, thereby preventing a dangerous situation. Furthermore, if multiple addresses are specified using the position knob P-SW as in the embodiment described above, multiple set position data B can be stored and the required set position can be selected. There is an advantage that the sitting treatment posture or standing treatment posture can be immediately obtained by manually operating the knob P-SW.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the structure of the automatic chair according to the present invention, FIG. 2 is a block diagram of the motion control section of the automatic chair, FIG. 3 is an electric circuit diagram of the motion control section, and FIG. The figure is a timing chart of the operation control section. 4,7,9...actuator, 6...seat, 8...
Back crest, 4A, 7A, 9A...driver,
3A, 6A, 8A...Detector, 10...Data signal synthesis circuit, 12...A-D conversion circuit, 13...
Time division circuit, 14...Comparison circuit, 15...Memory, 18...Latch circuit, 24...Write signal generation circuit, A...Current position data, B...Set position data, L-SW...Lift Knob, T-SW...
...Tilt knob, B-SW...Back knob, P
-SW...Position knob, R-SW...Reset switch, M-SW...Memory switch.

Claims (1)

[Claims] 1 The detected value of at least one of the height of the seat 6, the degree of inclination, and the amount of tilting of the backrest 8 is determined by A-
This information is stored in the memory 15 by a write command, and the set position data B read out by a read command given to the memory 15 and the current position data A converted from A to D are stored in the memory 15. Driver 4 of actuators 4, 7, and 9 is determined based on the comparison result.
In the automatic chair that controls A, 7A, and 9A, position switches P-SW ₁ and P-SW ₂ that specify the address of the memory 15 and generate a read command signal when manually operated, and this position switch P _-SW1 , P- _SW2 , and a memory switch M-SW that generates a write command signal on the condition that it is manually operated at the same time.