JPH0261256B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when the treatment chair shifts from a non-treatment position in which the backrest is upright to a treatment position in which the backrest lies down, or during the movement process, for example, the treatment table
Bring the therapeutic work components necessary for the treatment work, such as a surgical light, spittoon, or treatment instrument hanger, close to a position suitable for the treatment work, and when the treatment chair shifts from the treatment position to the non-treatment position, Keep it away from the treatment work position so that, for example, patients can get on and off the treatment chair without any trouble.
A dental treatment that aims to automatically perform the operation of the treatment work member in conjunction with the operation of the treatment chair, thereby eliminating such troublesome manual operations conventionally performed by a doctor. It is related to the device.

Embodiments of the present application will be described in detail below based on the drawings.

In conventional treatment chairs, the raising and lowering of the seat, the raising and lowering of the backrest, and the tilting of the seat as necessary are performed via an operation control circuit using an automatic operation switch and a manual operation switch. For example, Japanese Patent Publication No. 53-41477 discloses a dental treatment chair configured so that the treatment chair can be automatically or manually shifted between a treatment position and a non-treatment position.
53-41478 and 54-30233, and the present application utilizes the amount of displacement of the above-mentioned known treatment chair from the treatment position to the non-treatment position, for example, to perform shadowless treatment. Setting treatment work components such as light mechanisms to operating positions suitable for treatment work,
The purpose is to automatically move the chair between an inoperative position away from the treatment chair, and A shown in FIG. 1 indicates the above-mentioned known treatment chair.
B is a surgical light mechanism attached to the upper end of a column 3 erected on a spittoon support 2 integrally provided on the base 1 of the treatment chair A. It is composed of an arm 5 that is tilted by a section 4, and a surgical light 6 that is rotatably provided at the tip of the arm 5. Reference numeral C designates a moving table comprising a box 9 with casters 7 at the bottom and a treatment table 10 with treatment instruments 8 at the top.

FIG. 2 shows how the treatment chair A and the surgical light mechanism B automatically move the surgical light mechanism B to an operating position suitable for illuminating the patient's oral cavity when the treatment chair A shifts to the treatment position. In the operational circuit diagram showing the relationship, 11
12 is a manual setting operation switch for operating the treatment chair A in the direction of the treatment position; 12 is a manual reset operation switch for operating the treatment chair A in the direction of the non-treatment position; The operation of A is performed via the first and second operation control circuits 13 and 14, respectively, which is the same as in the known dental treatment chair described above. A first control unit 15 controls the drive unit 4 so as to set the operating light 6 of the operating light mechanism B to an operating position (the position indicated by the solid line in FIG. 1) that brings the operating light 6 of the operating light mechanism B closer to a position suitable for illuminating the patient's oral cavity. 1 is a control circuit, and 16 is a second control circuit that controls the drive unit 4 so as to guide the surgical light 6 to an inoperative position (position indicated by a broken line in FIG. 1) away from the treatment position;
Reference numeral 7 denotes a second detector composed of, for example, a variable resistance circuit whose potential is successively changed to a high level as the operating lamp mechanism B operates. Reference numeral 18 denotes a first detector consisting of, for example, a variable resistance circuit whose potential is successively varied to a high level as the treatment chair A operates;
The detector 18 receives a level signal a whose electric potential changes to a high level when the treatment chair A starts operating via the first operation control circuit 13 by the setting operation switch 11, and a level signal a whose potential changes to a high level along with the operation. By inputting the stop signal b when the operation stops upon reaching a predetermined position, the potential level is set to the level at which the operation of the treatment chair A is stopped, and the second operation control circuit 14 is activated by the reset operation switch 12. The O level is set by the start signal CI when the treatment chair A starts operating.

19 is the detection output P ₁ from the first detector 18
and the displacement output P ₂ from the second detector 17, and when P ₁ > P ₂ , a forward movement signal d is output to the first control circuit 15, and when P 1 < P 2, a forward movement signal d is outputted to the first control circuit 15, and when P ₁ < P ₂ , a forward movement signal d is outputted to the first control circuit 15. dynamic signal e
This is a comparator that outputs an operation stop signal f to the first and second control circuits 15 and 16, respectively, when P ₁ =P ₂ .

Now, when the treatment chair A operates the setting operation switch 11 to move to the treatment position, for example, the backrest of the treatment chair A starts to fall down via the first operation control circuit 13, and the backrest of the treatment chair A is raised accordingly. A level signal a that changes in level is input to the first detector 18. When the backrest moves to a desired position, the movement is stopped via the first operation control circuit 13, and the stop signal b and the level signal a are
The first detector 18 is set to a high level potential, for example, 10V, corresponding to the state in which the backrest is in a prone position, and this potential of 10V is input to the comparator 19. On the other hand, since the operating light mechanism B is placed in an inactive position away from the treatment device as shown by the broken line in FIG. 1 detector 18
In comparison with _{the 10V} potential from
The drive unit 4 of the operating light mechanism B is inputted to the control circuit 18.
operates in the forward direction. Then, with the operation, the surgical light mechanism B approaches the treatment position, and when the surgical light 6 reaches the operating position suitable for illuminating the affected area, the second surgical light mechanism B approaches the treatment position.
If the potential of the detector 17 becomes high level and is, for example, 10V, it will be equal to the 10V potential set in the first detector 15, and from the relationship P ₁ = P ₂ , the operation stop signal will be sent from the comparator 19. f is output, and this signal f causes the drive unit 4 to stop via the first control circuit 15, and the surgical light mechanism B is set to the operating position shown by the solid line in FIG.

However, dental treatment work is performed in this levered state.

Next, in order to restore the treatment chair A from this dental treatment state to a non-treatment state, the reset operation switch 12 is activated.
When operated, the backrest of the treatment chair A starts to stand up via the second operation control circuit 14, and at the same time, the first detector 18 is set to the O level by the start signal CI. Then the second detector 17
is placed at a potential of 10V, and from the relationship P ₁ > P ₂ , the comparator 19 sends the double-acting signal e to the second control circuit 16.
is input, and the drive unit 4 operates the surgical light mechanism B in the restoration direction. Then, along with the operation, the second detector 1
When the potential of 7 gradually decreases and reaches 0V, P ₁ =
From the relationship of _P2 , the comparator 19 generates an operation stop signal f, and the drive section 4 is stopped via the second control circuit 16, and the surgical light mechanism B is restored to the inoperative position shown by the broken line in FIG. On the other hand, the backrest is raised via the second operation control circuit 14, and the treatment chair A returns to the non-treatment position.

In the first embodiment described above, the setting and resetting operation switches 11 and 12 may be either manual or automatic, and in the case of manual operation, the treatment chair A can be placed in any position between the treatment position and the non-treatment position. If the setting is automatic, the treatment chair A is automatically set to a treatment posture that is stored in advance in the first operation control circuit 13, and this treatment posture is changed to a non-responsive posture by the second operation control circuit 14. Automatically returning to the treatment position is similar to conventional treatment chairs.
In this example, when the treatment chair A is set to the desired treatment position, a stop signal is used to set the operating light mechanism B to the operating position, and to move the treatment chair A to the non-treatment position, the reset operation switch is activated. When operated, operating light mechanism B is activated regardless of the movement of treatment chair A.
Since the operating position of the operating light mechanism B, which is most preferable for treatment work, is located within the movement area of the treatment chair A with the patient seated, the operation position of the surgical light mechanism B is, for example, If the surgical light mechanism B gets in the way when moving the chair from the non-treatment position to the treatment position, the surgical light mechanism B will move to the operating position after the treatment chair A reaches the treatment position. Chair A can be moved without any trouble, and
The surgical light mechanism can be set at the most preferable operating position for treatment work without being restricted by its movement position. FIG. 3 shows that the treatment chair A is activated via the second operation control circuit ₁₄ instead of the start signal C1 from the second operation control circuit 14 that sets the first detector 18 to the O level in the first embodiment. A reduction signal that sequentially reduces the high-level potential set in the first detector 18 as it moves to a non-treatment state.
C ₂ is input, and according to this second embodiment, the surgical light mechanism B changes from the operating position to the non-operating position following the movement of the treatment chair A from the treatment position to the non-treatment position. Therefore, when the reset operation switch is operated to set the treatment chair A to an arbitrary intermediate position between the treatment position and the non-treatment position for convenience of treatment work, the operating light mechanism B will also be activated. The treatment chair A can be set to any intermediate position between the operating position and the non-operating position, and the treatment chair A is adjusted while keeping the relative position between the illumination position by the surgical light 6 and the illuminated position relative to the patient constant. It is effective in some cases.

In both the first and second embodiments, the treatment chair A is set to the desired treatment posture by operating the setting operation switch 11, and then the surgical light mechanism B is activated to set it to a predetermined operating position approaching the treatment position. We have described the configuration for the case where the first detector 18 is
The setting operation switch 11 is operated to input a high level signal g which changes to a high potential sequentially in the process of the treatment chair A shifting from the non-treatment position to the treatment position via the first operation control circuit 13, and the reset operation is performed. The second operation control circuit 14 is operated by operating the switch 12.
The third case using a detector that inputs a low-level signal _h1 that sequentially changes to a low potential in the process of moving the treatment chair A from the treatment position to the non-treatment position via the
An embodiment is shown, and according to this configuration, when the backrest of the treatment chair A is raised or lowered, the surgical light mechanism B follows the movement proportionally between the operating position and the non-operating position. By operating the set or reset operation switches 11 and 12, the operating light mechanism B is
and the treatment chair A can be set at a desired position in a fixed relationship.

FIG. 5 shows a start signal h when the treatment chair A starts operating via the second operation control circuit 14 by operating the reset operation switch 12 instead of the low level signal h ₁ in the third embodiment described above. ₂ is input to the first detector 18 and the high potential level set in the detector 18 is set to O level.
This shows an example, and in this configuration, the output of the first detector 18 is maintained at 0V while the treatment chair A is moved in the direction of the non-treatment position by operating the reset operation switch 12, so P ₁ Due to the relationship < _P2 , the surgical light mechanism B is restored to the non-operating position before the treatment chair A is moved to the non-treatment position. In the third and fourth embodiments described above, it is preferable to use a reversible rotary motor as the drive section 4 of the surgical light mechanism B.

In the first to fourth embodiments described above, the operating light mechanism B is moved from the operating position to the non-operating position or vice versa in relation to the raising and lowering movement of the backrest of the treatment chair A, that is, the treatment chair A's back is
Increase the amount of movement from non-treatment state to treatment state by 100
%, the amount of movement of the operating light mechanism B from the non-operating position to the operating position was also assumed to be 100%. The treatment chair A can be adjusted and via said first actuation control circuit 13
It inputs the operation stop signal i ₁ when the device shifts from the non-treatment state to the treatment state, outputs the adjusted potential level, and outputs the operation signal j when the reset operation switch 12 is operated to the first detector 18 . A fifth embodiment is shown in which a detector is used that inputs an input signal to set the potential to O level. According to this embodiment, after the treatment chair A shifts from the non-treatment position to the treatment position, When the surgical light mechanism B moves from the non-operating position to the operating position and the potential of the first detector 18 is adjusted, for example, when the maximum displacement of the surgical lamp mechanism B to the treatment position is set to 100%, treatment is performed. Regardless of the treatment posture of chair A, the amount of displacement can be set to 80% or 50%, for example.
An arbitrary operating position such as % can be set. Therefore, the relationship between the treatment posture of the treatment chair A and the operating position of the surgical light mechanism B can be easily adjusted.

Further, in the fifth embodiment described above, when the treatment chair A shifts to a predetermined treatment posture, the _first
7 shows a case where the operating light mechanism B is automatically set to a predetermined operating position by activating the detector 18. In FIG. 7, the first detector 18 is
A sixth embodiment is shown in which a start signal i ₂ is input when the treatment chair A starts moving from the non-treatment position to the treatment position, instead of the stop signal i ₁ input to the At the same time that the treatment chair A shifts to the treatment position, the surgical light mechanism B also shifts to the operating position.

Next, the operation will be explained based on a specific electric circuit corresponding to the first embodiment shown in FIG. 8. In the figure, SW ₁ is a manual seat raising switch, SW ₂ is a manual seat lowering switch, ₃ is a manual backrest switch, SW ₄ is a manual backrest switch, SW ₅
is an automatic set switch, SW ₆ is an automatic reset switch, SW ₇ is a seat lift limit switch, SW ₈ is a seat lower limit switch, SW ₉ is a reclining limit switch, SW ₁₀ is a backrest limit switch, and VR ₁ is a seat lower limit switch. VR ₂ is a variable resistor that changes as the backrest moves up and down, and VR ₃ is a variable resistor that changes as the operating light mechanism B operates. For example, when the backrest switch SW ₃ is operated in order to bring A into the treatment position, the power source V is connected to the relay RY-20 that operates the chair driving valve, the program circuit 20 including the first actuation control circuit 13, and the diode D. For example, when the backrest is tilted in _the prone direction, the variable resistor VR ₂ which forms the first detector 18 is applied to
is variable in the high potential direction, and the diode D ₁
are connected to the gate of thyristor SCR ₁ and the base of transistor Tr ₂ respectively through the thyristor
When SCR ₁ is closed, relay RY-4 is operated by transistor Tr ₁ connected in series with SCR 1, and its contact S ₁ is closed.
The conduction of Tr ₂ causes the relay RY-3 connected in series with it to operate, opening its contact S ₂ .

On the other hand, as the backrest is tilted down, the potential of the variable resistor VR ₂ rises to a high level, and this potential is input to the comparator 19 . Since the potential of the variable resistor VR ₃ forming the second detector 17 that varies in conjunction with the operating light mechanism B is 0V because the operating light mechanism B is in an inactive state, the potential of the variable resistor VR 3 is determined by the comparator 19. A comparison output V _L is produced, which is applied to the base of transistor Tr ₄ to make it conductive.

However, when the push on the backrest switch SW ₃ is released from the levered state, the operation of the relay RY-20 is released.
The backrest is stopped in the prone state, and the high potential of the variable resistor VR ₂ is applied via the program circuit 20, for example.
A potential of 10V is set, and power to the gate of the thyristor SCR ₁ and the base of the transistor Tr ₂ is cut off. Since the thyristor SCR ₁ remains conductive even when its gate voltage is removed, the contact S ₁ is closed, and the transistor Tr ₂ is opened, which closes the contact S ₂ and therefore the power supply V is a contact
S ₁ , S ₂ to the relay RY-2, so that said transistor in series with said relay RY-2
As mentioned above, Tr ₄ is in a conductive state due to the application of comparison output V _L (corresponding to signal d), so the relay
RY-2 operates to close its contact _S5 , and the reciprocating element 21 for moving the drive section 4 of the surgical light mechanism B in series with it to the operating direction operates, and the surgical light mechanism B operates. As it moves to the operating position, the potential of the variable resistor VR ₃ rises due to this shifting operation, and this potential and the potential of the variable resistor VR ₂ on the backrest side are compared by the comparator 19, and both potentials are When they become equal, the comparator 19 produces an output VW (corresponding to the signal f). Then, the output VW is applied to the base of the transistor Tr ₁ , and the transistor Tr ₁ is opened.
As a result, thyristor SCR ₁ also becomes inoperable, contact S ₁ opens, and power to relay RY-2 is cut off.
The contact _S5 is opened, the forward movement element 21 is deactivated, and the surgical light mechanism B is set to a predetermined operating state.

Next, from this state, when the backrest upright switch SW ₄ is operated to restore the operating light mechanism B to the inactive state, the power supply V is activated by the relay that operates the chair drive valve.
RY-21, the reset circuit 22 including the second operation control circuit 14, and the diode _D2 , respectively.
As the backrest tilts in the upright direction, the potential of the variable resistor VR ₂ decreases and is applied to the gate of the thyristor SCR ₁ and the base of the transistor Tr ₂ via the diode D ₂ , respectively. Relay RY-4 in series with thyristor SCR ₁
The contact _S1 is closed via the relay RY3 connected in series with the transistor _Tr2 , and the contact _S2 is opened via the relay _RY3 connected in series with the transistor Tr2.The reset signal is also sent via the reset circuit 22 to the transistor Tr for setting the O level. ₆
and the gate of thyristor SCR ₂ , respectively. Then, the transistor Tr ₆ becomes conductive, and the high potential of the variable resistor VR ₂ set in the comparator 19 is set to O level, and the thyristor SCR ₂ is closed and the transistor Tr 6 connected in series with it is turned on. ₅ , the relay in series with this
RY-5 operates, its contact _S3 switches, and power V is applied to relay RY-1. The relationship between the potentials of the variable resistor VR ₂ on the backrest side input to the comparator 19 and the variable resistor VR ₃ on the surgical light mechanism B side is that the latter has a higher potential, so the output from the comparator 19 V _H (corresponding to the signal e) is applied to the base of the transistor Tr ₁ in series with the relay RY-1 and becomes conductive, and the relay RY-1 operates to close its contact S ₄ and the The reciprocating element 23 for restoring the drive unit 4 of the operating light mechanism B to the non-operating direction is activated, and the operating light mechanism B moves to the non-operating position, and
Along with this operation, the potential of the variable resistor VR ₃ falls, and the comparator 19 compares this potential with the potential of the variable resistor VR ₂ on the backrest side, and when both potentials become equal, the comparison is made. The output VW is generated from the transistor 19, and this is added to the bases of the transistors Tr ₁ and Tr ₅ , making them inactive, and relays connected in series with them respectively.
Contact S 1 is opened via RY-4 and RY- ₅ , and contact S ₃ is switched, and since relay RY-1 is also deactivated, its contact S ₄ opens, and double-acting element 23 in series with it opens. becomes inoperative, and the surgical light mechanism B is restored to its inoperative state.

When the backrest upright switch SW ₄ is released in this state, the relay RY-21 stops, the variable resistor VR ₂ returns to the O level, and the SCR ₁ becomes inoperable and the contact S ₁ closes. open and also transistor
Tr ₂ opens and contact S ₂ closes, returning to the initial state.
In the figure, 24 and 25 are auto light circuits for automatically controlling the blinking of the surgical light 6, and Tr ₇ is a transistor for operating the relay RY-6 of the contact S6 connected to the circuit of the surgical light ₆ . For example, when the operation signal when switch SW ₃ is operated is input to the program circuit 20, the signal from the program circuit 20 is input to the auto-write circuits 24 to 25, and the auto-write circuit 25 is placed in an operable state. . Next, when the output VW is generated from the comparator 19, _the auto-write circuit 25 is activated by the input of the output VW, and the operation signal is applied to the base of the transistor Tr ₇ , which turns on and becomes a relay. −RY
-6 is activated, its contact _S6 is turned on, and the operating light 6 is turned on.

That is, when the surgical light mechanism B reaches the operating position, the surgical light 6 is automatically turned on. This lighting state is changed when the output VW from the comparator 19 disappears.
That is, when the surgical light mechanism B starts operating in the non-operating direction, it is automatically released.

Furthermore, in the figure, LED is a light emitting diode, and Tr ₈ is a transistor for controlling the light emitting diode LED.
The light emitting diode LED emits light when the output VW of P ₁ =P ₂ generated by the comparator 19 is input to the base of the transistor Tr ₈ , and when the output VW disappears, the light emission stops. Then, it can be confirmed that the surgical light mechanism B has reached the operating position.

In the above description, by omitting the transistor Tr ₆ , the specific electric circuit of the second embodiment shown in FIG. 3 is constructed.

Furthermore, in the above, automatic set switch SW ₅
When the automatic reset switch SW 6 is operated, the treatment chair A automatically shifts to the treatment mode stored therein via the program circuit 20, and when the automatic reset switch SW ₆ is operated, the treatment chair A shifts to the non-therapy mode via the reset circuit 22. It is automatically restored.

Further, a specific electric circuit corresponding to the third embodiment shown in FIG. 4 is a relay that opens and closes the contact S ₂ in the control circuit section U shown in FIG. 10, as shown in FIG.
This corresponds to RY-3 and Tr ₂ connected in series with it omitted, and the remaining configurations are the same.

That is, in the circuit shown in FIG. 8, after the backrest is tilted down to a predetermined treatment position by the circuit of transistor Tr ₂ and relay RY-3, the surgical light mechanism B is moved to a predetermined operating position. However, since the relay RY-3 including the transistor Tr ₂ and the contact S ₂ mentioned above is omitted, when the backrest switch SW ₃ is operated, RY-2 is activated immediately and its contact S ₅ is activated. When the backrest is closed, the reciprocating element 21 in series with the backrest is activated to follow the reclining of the backrest, and the surgical light mechanism B shifts to the operating state.

In the case of the fourth embodiment, the transistor Tr ₆ is further omitted from the specific electric circuit in the third embodiment.

FIG. 10 is a diagram showing a specific electric circuit corresponding to the fifth embodiment shown in FIG. 6, and the difference from the electric circuit shown in FIG. In place of the variable resistor VR ₂ , which varies with the up-and-down motion of the operating light mechanism B, input the set potential of the variable resistor VR ₄ , whose potential can be manually adjusted. The voltage of the variable resistor VR3 is compared with the voltage of the variable resistor _VR3 , which changes with the change in voltage.

Therefore, in this configuration, the potential P ₁ of the arbitrarily set variable resistor VR ₄ and the potential P ₂ of the variable resistor VR ₃ interlocked with the surgical lamp mechanism B are compared in the comparator 19. When P ₁ > P ₂ , the output V _L is output from the device 19, and when P ₁ < P ₂ , the output V _H is output, and P ₁
VW occurs when = _P2 , and the operation based on the output from the comparator 19 is similar to the circuit operation shown in FIG.

In the above, when manually adjusting the variable resistor VR ₄ , first manually move the surgical light mechanism B to the desired operating position and then set the potential P ₂ of the variable resistor VR ₃ at that time. setting, and then, in this state, manually adjust the variable resistor VR ₄ until the light emitting diode LED emits light.

Although the above embodiment described the surgical light mechanism B as a member for treatment work, the treatment instrument was held on the side of the backrest of the treatment chair via a guide shaft, as is known in Japanese Utility Model Application Publication No. 56-113526. The hanger may be moved between an inactive lower position and an activated upper position by means of a suitable drive.

In addition, the base of the treatment chair is equipped with a column with a hanger on the top that holds the treatment equipment so that it can be moved back and forth, and this column can be moved between the rear position, which is an inactive position, and the front position, which is an activated position. It may be moved, and in any case, the members for treatment work are not limited to those described above.

As detailed above, according to the present application, the treatment work member is automatically operated to suit the treatment work by using the amount of displacement during the movement process in which the treatment chair shifts from the non-treatment position to the treatment position or vice versa. Since the treatment chair is configured to move between the position and the inoperative position where it moves away from the treatment chair, there is no risk that treatment work members will be located within the operation area of the treatment chair during the operation process and interfere with the operation of the treatment chair. It is possible to easily change the treatment posture of the treatment chair while keeping the motion relationship between the motion of the treatment chair and the members for treatment work constant, and it is also possible to easily change the motion relationship of the treatment work members with respect to the motion of the treatment chair. can be changed to
It is extremely suitable for treatment work, and has the advantage of allowing patients to get on and off the treatment chair safely.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a general side view, FIGS. 2 to 7 are block diagrams of operating circuits, and FIGS. 8 to 10 are specific electrical circuit diagrams. In the figure, A is a treatment chair, B is a surgical light mechanism, 4 is a drive unit, 6 is a surgical light, 11 is a setting operation switch,
12 is a reset operation switch, 13 is a first operation control circuit, 14 is a second operation control circuit, and 15 is a first operation control circuit.
16 is a second control circuit, 17 is a second detector, 18 is a first detector, and 19 is a comparator.

Claims (1)

[Scope of Claims] 1. Transition from a non-treatment state to a treatment state via a first operation control circuit activated by operating a set operation switch, and a transition from a non-treatment state to a treatment state via a second operation control circuit activated by operation of a reset operation switch. When the treatment chair returns from the treatment position to the non-treatment position, when a forward movement signal is input to the first control circuit, when the chair is moved to the operating position by driving the drive unit, and when a return movement signal is input to the second control circuit. , a treatment work member that is restored to an inoperative position by driving the drive unit and whose operations are stopped by inputting an operation stop signal; and a potential that changes to a high potential as the treatment chair shifts to a treatment posture. is detected, and when the transition to the treatment position is stopped, the stop signal sets the potential to the potential at the time of stop, and this potential is set to the O level by the start signal when the treatment chair starts transitioning to the non-treatment position. a first detector to be set; a second detector to detect a potential that changes to a high potential as the therapeutic work member moves to the operating position _; When P _{1 >} P ₂ , a forward motion signal is output to the first control circuit, and when P ₁ <P ₂ , a backward motion signal is output to the second control circuit. and a comparator that outputs a stop signal to the first and second control circuits when P ₁ =P ₂ . 2. The dental treatment apparatus according to claim 1, wherein the treatment work member is at least one of a treatment table, a surgical light, and a treatment instrument hanger. 3. The dental treatment apparatus according to claim 1 or 2, wherein the first and second detectors are variable resistors. 4. The dental treatment device according to claim 1, 2, or 3, wherein the operating switch is an operating switch for manual or automatic setting. 5 Transition from non-treatment mode to treatment mode via the first operation control circuit activated by operation of the reset operation switch, and transition from treatment condition to non-treatment condition via the second operation control circuit activated by operation of the reset operation switch. When the treatment chair returns to the posture and a forward movement signal is input to the first control circuit, the driving section moves to the operating position, and when the forward movement signal is input to the second control circuit, the driving section moves to the operating position. The treatment work member is restored to the inoperative position and stops its operation upon input of an operation stop signal, and the electric potential that changes to a high potential as the treatment chair shifts to the treatment posture is detected, and the treatment is performed. a first detector that is set to the potential at the time of stop by a stop signal when the transition to the treatment posture is stopped, and that continuously reduces this potential as the treatment chair transitions to the non-treatment posture; and the treatment operation. A second detector detects a potential that changes to a high potential as the operating member moves to an operating position, and a set potential _P1 of the first detector and a detected potential _P2 of the second detector are compared. When P ₁ > P ₂ , a forward motion signal is output to the first control circuit, and when the reduced voltage P ₁ ′ in the first detector is P ₁ ′<P ₂ , a backward motion signal is output to the second control circuit. and a comparator that outputs a stop signal to each of the first and second control circuits when P1 to _{P1 '} = _P2 . 6. The dental treatment apparatus according to claim 5, wherein the treatment work member is at least one of a treatment table, a surgical light, and a treatment instrument hanger. 7. The dental treatment apparatus according to claim 5 or 6, wherein the first and second detectors are comprised of variable resistors. 8 The state is changed from the non-treatment state to the treatment state via the first operation control circuit activated by the reset operation switch, and the treatment state is changed from the treatment state through the second operation control circuit activated by the operation of the reset operation switch. When the treatment chair returns to the posture and a forward movement signal is input to the first control circuit, the driving section moves to the operating position, and when the forward movement signal is input to the second control circuit, the driving section moves to the operating position. The treatment work members are restored to the inoperative position and their operation is stopped by an operation stop signal, and the electric potential that changes to a high electric potential as the treatment chair shifts to the treatment posture is detected, and this electric potential is detected. , a first detector that is set to the O level in response to a start signal at the time of starting the transition of the treatment chair to the non-treatment position, and a potential that is varied to a high potential as the treatment work member transitions to the operating position. The second detector to be detected compares the detection potential P ₁ of the first detector with the detection potential P ₂ of the second detector, and when P ₁ > P ₂ , a forward motion signal is sent to the first control circuit. and a comparator that outputs a return signal to the second control circuit when P ₁ < P ₂ and outputs a stop signal to the first and second control circuits when P ₁ = P ₂ . A dental treatment device characterized by: 9. The dental treatment apparatus according to claim 8, wherein the treatment work member is at least one of a treatment table, a surgical light, and a treatment instrument handle. 10. The dental treatment apparatus according to claim 8 or 9, wherein the first and second detectors are variable resistors. 11 Shift from non-treatment mode to treatment mode via the first operation control circuit activated by operation of the reset operation switch, and change from treatment condition to non-treatment condition via the second operation control circuit activated by operation of the reset operation switch. When a forward movement signal is input to the first control circuit, the treatment chair returns to the posture, moves to the operating position by driving the drive unit, and returns to the non-operation position by driving the drive unit by the second control circuit, A treatment work member whose operations are stopped upon input of an operation stop signal, a first detector that detects a potential that changes to a high potential as the treatment chair shifts to a treatment posture, and the treatment work member. A second detector detects a potential that changes to a high potential as the device moves to the operating position, and a detection potential P ₁ of the first detector and a detection potential P ₂ of the second detector are compared. When ₁ > P ₂ , a forward motion signal is output to the first control circuit, and when P ₁ < P ₂
When P ₁
A dental treatment apparatus comprising: a comparator that outputs a stop signal to the first and second control circuits when = _P2 . 12. The dental treatment apparatus according to claim 11, wherein the treatment work member is at least one of a treatment table, a surgical light, and a treatment instrument hanger. 13. The dental treatment apparatus according to claim 11 or 12, wherein the first and second detectors are variable resistors. 14 Shift from the non-treatment state to the treatment state via the first operation control circuit activated by operating the reset switch, and change from the treatment state to the non-treatment state via the second operation control circuit activated by operating the reset operation switch. When the forward motion signal is input to the first control circuit, the treatment chair is moved to the operating position by the drive of the drive section, and when the backward motion signal is input to the second control circuit, it is moved to the operating position by the drive of the drive section. A treatment work member whose operation is restored to the operating position and whose operation is stopped upon input of an operation stop signal, and set to a desired high potential by the stop signal when the treatment chair is moved to the treatment position, and This potential is set to the O level by a start signal when the treatment chair starts to shift to the non-therapy position, and the potential changes to a high potential as the treatment work member moves to the operating position. _A second detector _that detects _the potential _of output, and when P ₁ < P ₂ , the second
a comparator that outputs a stop signal to the control circuit and outputs a stop signal to the first and second control circuits when P ₁ = P ₂ , and the potential set by the stop signal of the first detector is adjusted. A dental treatment device characterized in that: 15. The dental treatment apparatus of claim 14, wherein the first detector comprises a manual variable resistor. 16. The dental treatment apparatus according to claim 14 or 15, wherein there is at least one member for treatment work. 17. The dental treatment apparatus according to claim 15 or 16, wherein the first and second detectors are variable resistors.