WO2004095487A1

WO2004095487A1 - 3-position enable device

Info

Publication number: WO2004095487A1
Application number: PCT/JP2004/005609
Authority: WO
Inventors: Akihito Okamoto
Original assignee: Idec Izumi Corporation
Priority date: 2003-04-21
Filing date: 2004-04-20
Publication date: 2004-11-04
Also published as: JP2004327068A; JP4253525B2

Abstract

An anode terminal (9A) of an SCR (9) is connected to an emitter terminal of a photo-detector (21B) of a photoelectric sensor (21) and a gate terminal (9B) of the SCR (9) is connected to an emitter terminal of the photo-detector (21B) of a photoelectric sensor (22). Voltage between the anode terminal (9A) of the SCR (9) and the emitter terminal of the photo-detector (21B) is output as an enable signal (S1) of an enable switch (10). During operation of an operation member (4), the enable signal (S1) is turned ON at an intermediate operation position (PB). Upon reset of the operation member (4), the operation member (4) is reset to a non-operation position (PA) without turning ON the enable signal (S1), which has been turned OFF at a complete operation position (PC), at the intermediate operation position (PB).

Description

Specification

3 Position Enabler Technical Field

INDUSTRIAL APPLICABILITY The present invention is used for a teaching pendant of an industrial robot, a deadman switch in a drip switch, and the like, and is fully operated when an operating member operated from a non-operating position through an intermediate operating position to a full operating position is returned. The present invention relates to a three-position enabling device that maintains an off state in a position. Background art

The teaching work of the operation of the mechanical device such as the industrial robot at the initial stage and at the time of adjustment is performed by operating a portable teaching pendant. At the time of teaching work, the operator must operate the teaching pendant gripped in the state of being close to the movable part of the mechanical device. You are at risk.

The teaching pendant is provided with an enable device for selectively enabling the output of the teaching signal as a means for avoiding the danger of the operator when an abnormality occurs during the teaching operation on such a mechanical device. . The enabling device includes an operable switch disposed on a teaching pendant together with an operation switch for receiving an instruction input for outputting a teaching signal to a mechanical device. This operable switch is also called a deadman switch, and can be operated only while the operator holds the teaching pendant in a predetermined posture. That is, only when the deadman switch is operated, the teaching signal based on the operation of the operation switch that is turned on is validated, and the teaching operation to the mechanical device becomes possible. By equipping the teaching pendant with an enable device, the operator can press the operating member to turn on the deadman switch and press the operating switch to teach the operation to the mechanical device. When the mechanical device performs an operation that the operator does not intend due to a failure or an operation error of the teaching operation device, the operator releases his / her finger from the operating member of the deadman switch or releases the teaching pendant, and the deadman switch is released. Is turned off, the operation signal to the mechanical device is invalidated, and the mechanical device can be stopped.However, when the mechanical device performs an operation not intended by the operator, the operation of the deadman switch is as follows. Not only let go of your finger and release the teaching pendant, but also Or push strongly on of et al., Ru mower that squeezing more strongly the teaching pendant. Therefore, as a deadman switch, an ordinary two-position switch that simply turns on and off in accordance with the presence or absence of pressing of the operation member is not sufficient.

For this reason, in the conventional teaching pendant, for example, as described in Japanese Patent Application Laid-Open No. 2001-350350, Japanese Patent Application Laid-Open No. When the operating member is lightly pushed in from the non-operating position in the off state and displaced to the intermediate operating position, it turns on when the operating member is further pushed in from this intermediate operating position and reaches the fully operating position, and it turns off. The three position enabling device is used as a deadman switch.

This three-position enabling device keeps the off state without being turned on at the intermediate operating position while the operating member returns from the complete operating position to the non-operating position via the intermediate operating position. . In order to avoid danger, when the operator who pushed the operating member of the deadman switch to the fully operating position stops the mechanical device and stops releasing the finger from the operating member of the deadman switch, the mechanical device stops operating completely. Because you need to be You.

However, the conventional three-position enable device has a complicated structure, and there is a problem that it is not possible to sufficiently cope with demands for downsizing and cost reduction.

That is, the conventional three-position enable device is provided with a contact type switch having a fixed contact and a movable contact, and the fixed contact is provided while the operating member is pressed from the non-operating position to the fully operating position. On the other hand, the movable contact is changed from the non-contact state to the non-contact state via the contact state, while the movable member is moved to the fixed contact while the operating member returns from the complete operation position to the non-operation position. A mechanism for irreversibly transmitting the displacement of the operation member to the movable contact is required so that the state of the operating member changes from the non-contact state to the non-contact state without passing through the contact state. That is, it is necessary to operate a plurality of members in a complicated manner with the displacement of the operating member so that the transmission state of the displacement of the operating member to the movable contact is changed according to the direction of displacement of the operating member.

An object of the present invention is to make the displacement of the operating member irreversible by selectively enabling on / off signals output from the first and second switches according to the combination of the displacement of the operating member. Another object of the present invention is to provide a three-position enable device which does not require a mechanism for transmitting the movable contact to the movable contact, simplifies the structure, and realizes sufficient miniaturization and cost reduction. Disclosure of the invention

The present invention has the following arrangement as means for solving the above-mentioned problems.

(1) An operating member is provided that moves from the non-operation position to the full operation position via the intermediate operation position during operation, and moves from the full operation position to the non-operation position via the intermediate operation position when returning.

Each of the non-operation position, the intermediate operation position and the full operation position of the operation member Intermediate operation when operating the operating member based on a combination of at least one switch that includes multiple switch elements that are turned on / off in different combinations, and the on / off state of multiple switch elements in each switch And a signal output circuit that outputs an ON signal only at the position, and outputs an OFF signal at a non-operation position, a complete operation position, and an intermediate operation position upon return of the operation member.

In this configuration, a plurality of switch elements constituting the switch individually output on / off signals according to the position of the operation member, and operate in accordance with a combination of the plurality of on / off signals output from the switch. A signal output circuit selectively enables a plurality of on-Z off signals so that an ON signal is output only when a member is displaced from a non-operation position to an intermediate operation position. Therefore, a mechanism for irreversibly transmitting the displacement of the operation member to the movable contact can be eliminated, and the structure can be simplified, and the size and cost of the device can be reduced.

(2) the switch is a first switch element that is different from an off-Z off state when the operating member is in the non-operating position and an on-Z off state when the operating member is in the intermediate operating position and the fully operating position; and The signal output comprises a second switch element that is different between an off-Z state when the operating member is in the non-operating position and the intermediate operating position and an on / off state when the operating member is in the fully operating position, The circuit is characterized in that the first or second switch element is maintained in the OFF state in the fully operated position at the intermediate device position when the operation member is returned.

In this configuration, the first and second switch elements constituting the switch output on / off signals individually according to the position of the operation member, and correspond to a combination of two on / off signals output from the switch. The signal output circuit selectively enables the two ON / OFF signals so that the ON signal is output only when the operation member is displaced from the non-operation position to the intermediate operation position. Therefore, the operating member can be moved to the non-operating position, The position or the fully operated position can be specified, and the structure can be further simplified.

(3) The switch is characterized by comprising a plurality of contactless switch elements.

In this configuration, an ON / OFF signal is output from the first and second switch elements, which are non-contact switch elements, according to the position of the operation member. Therefore, it is possible to make the life of the switching semi-permanent in the switch.

(4) The switch includes a first optical sensor and a second optical sensor each including a light emitting element and a light receiving element, and a light transmitting state or a reflecting state at a position facing the light emitting element in conjunction with the operation member. And a changing shirt.

In this configuration, the first and second switch elements constituting the switch are constituted by an optical sensor including a light emitting element and a light receiving element, and the light emitted from the light emitting element by the shirt interlocked with the operation member The light receiving state of the light receiving element changes according to the position of the operation member. Therefore, a switch that outputs an on / off signal according to the position of the operation member can be easily configured by the two optical sensors and the shutter that is interlocked with the displacement of the operation member.

(5) The switch includes first and second switch elements each including a magnetic sensor, and a magnet separated from or approaching the magnetic sensor in conjunction with the operation member.

In this configuration, the first and second switch elements constituting the switch are configured by a combination of a magnetic sensor and a magnet, and the magnet moves closer to or away from the magnetic sensor in conjunction with the operation member. The output state of the magnetic sensor changes according to the position of the operation member. Therefore, according to the position of the operating member, the two switch elements and the magnets linked to the displacement of the operating member A switch that outputs an on-Z off signal can be easily configured.

(6) The switch is characterized by comprising a plurality of contact switch elements.

In this configuration, an ON / OFF signal is output from the first and second switch elements, which are contact switch elements, according to the position of the operation member. Therefore, the configuration for switch signal processing can be simplified.

(7) At least one monitor switch for outputting a signal for identifying whether the operation member is in a non-operation position, an intermediate operation position, or a complete operation position is provided.

In this configuration, a signal for identifying the position of the operation member is output from the monitor switch. Therefore, the operation state of the operation member can be accurately recognized. Brief description of the drawings

FIG. 1 is a cross-sectional view showing a configuration of an enable switch which is a three-position enable device according to an embodiment of the present invention. FIG. 2 is a diagram showing the configuration and operation of the switch and signal output circuit in the enable switch. FIG. 3 is a timing chart of signals in each section of the signal output circuit. FIG. 4 is a diagram showing a configuration of a switch of the above enable switch. FIG. 5 is a diagram showing another configuration of the switch and the signal detection circuit in the enable switch. FIG. 6 is a diagram showing a configuration of another switch and a signal output circuit in the enable switch. FIG. 7 is a diagram showing a configuration of still another switch and a signal output circuit in the above-mentioned enable switch. FIG. 8 is a diagram showing a configuration in which a plurality of magnetic sensors are used as switches in the enable switch. FIG. 9 is a configuration of a signal output circuit applied to a switch using the above magnetic sensor and an evening chart of signals in main parts. FIG. 10 shows a rice plant according to another embodiment of the present invention. FIG. 2 is a front cross-sectional view showing the configuration of a single switch and a timing chart of signals. FIG. 11 shows a configuration of a switch, a circuit diagram of a signal output circuit, and an ON / OFF state of a switch element according to a position of an operation member in an rice switch according to still another embodiment of the present invention. . FIG. 12 is a diagram showing an operation state of the switch.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a diagram showing a configuration of an enable switch which is a three-position enable device according to an embodiment of the present invention. Fig. 1 (A) is a front sectional view of the rice pull switch, Fig. 1 (B) is a sectional view taken along the line X-X in Fig. 1 (A), and Fig. 1 (C) is an operation of the operating member. FIG. 7 is a diagram showing a relationship between an operation load required for the operation and a stroke of an operation member. The enable switch 10 according to the embodiment of the present invention includes a first photoelectric sensor (first switch element) included in each of the two switches 2A and 2B in a housing 1 having upper and lower surfaces open. A substrate 3 on which 21 and a second photoelectric sensor (second switch element) 22 are mounted is housed, and an operation member 4 is provided so as to be vertically movable. The first and second photoelectric sensors 21 and 22 are the optical sensors of the present invention.

The operation member 4 is exposed on the upper surface side of the housing 1 and is urged upward by the elastic force of springs 5A and 5B provided in the housing 1. Locking pieces 41A and 41B extend downward from the inner surface of the operating member 4 in parallel at regular intervals. Protrusions 42A and 42B protrude near the lower ends of the surfaces of the locking pieces 41A and 41B facing each other. The upper end of the shirt 6 is fixed to the inner surface of the operation member 4. The bottom of shirt evening 6 is open.

A bottom member 7 for closing the lower surface of the housing 1 holds the lower end of the substrate 3. The output pins 8 A to 8 C that conduct to the circuit formed on the board 3 penetrate the bottom member 7 and are exposed on the lower surface side of the housing 1. Also, inside the bottom member 7 A column 71 extends upward from the surface. The upper end of the column 71 faces between the locking pieces 41 A and 4 IB extending from the operation member 4. The projections 42A and 42B protruding from the locking pieces 41A and 41B are in contact with the two side surfaces of the support 71 that face the locking pieces 41A and 41B, respectively. On each of the two side surfaces of the column 71, large steps 71A and 71B with a large amount of protrusion and small steps 72A and 72B with a small amount of protrusion are formed. Accordingly, the operation load F when the operation member 4 is pressed downward is increased in proportion to the increase of the stroke L of the operation member 4 due to the elastic force of the springs 5A and 5B, and the protrusion 42A, When 42B crosses the small steps 72A, 72B and the large steps 71A, 71B, it suddenly changes according to the protrusion amount of the small steps 72A, 72B and the large steps 71A, 71B. To increase. The small steps 72A and 72B are formed corresponding to the intermediate operation position of the operation member 4, and generate a relatively light click feeling when operating the operation member 4 to the intermediate operation position. The large steps 71A and 7IB are formed corresponding to the fully operated position of the operation member 4, and generate a relatively heavy click feeling when operating the operation member 4 to the fully operated position.

As will be described later, the photoelectric sensors 21 and 22 include the light emitting elements 21 and 22A and the light receiving elements 21B and 22B facing each other with a predetermined gap therebetween. A shirt 6 passes through the gap between the light emitting elements 21A and 22A and the light receiving elements 21B and 22B from above.

As shown in FIG. 1 (A), no downward operation force is applied to the operation member 4, and the operation member 4 is in the uppermost non-operation position by the elastic force of the springs 5A and 5B. At this time, the protrusions 42A and 42B are in contact with the upper sides of the small step portions 72A and 72B on the two side surfaces of the column 71. When a downward operation force is applied to the operation member 4 from the state shown in FIG. 1, the operation member 4 moves downward, and the projections 42A and 42B become small step portions 72A and 72 at the intermediate operation position of the operation member 4. Beyond B, it comes into contact with the upper ends of the large steps 71A and 71B. Stops moving downwards.

When a larger operation force is applied to the operation member 4 in the intermediate operation position, the locking pieces 41A and 41B are elastically deformed in a direction away from each other, and the projections 42A and 42B are large. Overcoming the sections 71A and 71B downward, the operating member 4 moves to the lowermost position, the fully operating position. When the operating force is no longer applied to the operating member 4 from the state where the operating member 4 is in the completely operating position, the operating member 4 is pushed upward by the elastic force of the springs 5A and 5B, and passes through the intermediate operating position. Return to the non-operation position.

From the above, as shown in FIG. 1 (C), the operation load acting on the operation member 4 is changed from the non-operation position of the operation member 4 to the intermediate operation position by the elastic force of the springs 5A and 5B. It increases in proportion to the stroke L to reach the full operation position, and increases slightly when reaching the intermediate operation position beyond the small steps 72A, 72B, and increases to the large steps 71A, 71 Significant increase when reaching full operating position beyond B. Therefore, a relatively small click feeling occurs when operating the operation member 4 from the non-operation position to the intermediate operation position, and a relatively large click feeling occurs when the operation member 4 is operated from the intermediate operation position to the full operation position. Occurs.

FIG. 2 is a diagram showing a configuration and an operation of a switch and a signal output circuit in the enable switch. FIG. 3 is a timing chart of signals in each section ((3 1 and 2)) of the signal output circuit.

As shown in FIG. 2, the shirt 6 includes a lower portion 6A facing the photoelectric sensor 21 and an upper portion 6B facing the photoelectric sensor 22. On the lower side 6A, a light-shielding portion 61A and light-transmitting portions 62A, 63A are formed from below to above. On the upper part 6B, light shielding parts 61B, 62B and a light transmitting part 63B are formed from below to above.

When the operation member 4 is in the non-operation position PA, the photoelectric sensor 21 and the photoelectric sensor 22 are respectively provided with the light-shielding portions 61A and 61A of the shutter 6. Each faces each other. When the operation member 4 is at the intermediate operation position PB, the light-transmitting portion 62A and the light-shielding portion 62B of the shutter 6 face each of the photoelectric sensor 21 and the photoelectric sensor 22. When the operation member 4 is at the complete operation position PC, the light-transmitting portions 63A and 63B of the shirt 6 face the photoelectric sensors 21 and 22, respectively.

In the enable switch 10, the signal output circuit of the present invention is constituted by the SCR 9 mounted on the substrate 3 together with the photoelectric sensors 21 and 22. The emitter terminal of the light receiving element 21 B of the photoelectric sensor 21 is connected to the anode terminal 9 A of the SCR 9, and the emitter terminal of the light receiving element 21 B of the photoelectric sensor 22 is connected to the gate terminal 9 B of the SCR 9. Is connected. The anode voltage of SCR 9 (the potential between the anode terminal 9 A and the force source terminal 9 C) is output as the enable signal S 1 of the enable switch 10. The power source terminal 9 C of the SCR 9 is grounded at the terminal G. As described above, depending on whether the operating member 4 is located at the non-operating position PA, the intermediate operating position PB, or the fully operating position PC, the photoelectric at the lower portion 6A and the upper portion 6B of the shutter 6 is determined. The position facing the sensors 21 and 22 changes. Due to this change, the ON-Z state of the light receiving elements 21 B and 22 B of the photoelectric sensors 21 and 22 changes, and the operation state of the SCR 9 changes accordingly.

Hereinafter, the operation state of the SCR 9 according to the position of the operation member 4 will be described. First, when the operation member 4 is in the non-operation position PA during the pressing operation of the operation member 4 that moves downward, the light-shielding portions 61 A and 61 A of the shirt 6 Due to each of B, the light from the light emitting elements 21A and 22A of the photoelectric sensors 21 and 22 is not received by the light receiving elements 21B and 22B, and both the light receiving elements 21B and 22B are off. Therefore, both the node terminal 9A and the gate terminal 9B of the SCR 9 are at the low level, and the enable signal S1 in the off state is output.

When the operation member 4 moves from the non-operation position PA to the intermediate operation position PB, The light-receiving element 21 B of the photoelectric sensor 21 receives the light of the light-emitting element 21 A and turns on, while the light-transmitting part 62 A and the light-shielding part 62 B of the The light-receiving element 22 B of the light-emitting element 22 A remains off without receiving the light of the light-emitting element 22 A. Therefore, the anode voltage of the SCR 9 becomes high level, and the enable signal S1 in the ON state is output.

Further, when the operation member 4 moves from the intermediate operation position PB to the full operation position PC, the translucent portions 63 A and 63 B of the shirt 6 are respectively moved by the photoelectric sensors 21 and 22 respectively. The light receiving elements 21 B and 22 B of the photoelectric sensors 21 and 22 receive the light of the light emitting elements 21 A and 22 A and turn on. Therefore, the gate terminal 9B of SCR 9 goes high, SCR 9 turns on, the emitter terminal of the photodetector 21B is grounded via SCR 9, and the anode voltage of SCR 9 goes low. As a result, the enable signal S1 in the off state is output.

Next, when the operation member 4 moves upward from the full operation position PC to the intermediate operation position PB when the operation member 4 moves upward, the light transmitting portion 62A of the shutter 6 and the light Each of the portions 6 2 B faces the photoelectric sensor 21 and the photoelectric sensor 22, and the light receiving element 21 B of the photoelectric sensor 21 receives the light of the light emitting element 21 A and remains on. . Therefore, the potential at the connection between the anode terminal 9A of the SCR 9 and the emitter terminal of the light receiving element 21B is maintained at a high level, and the input of the gate terminal 9B of the SCR 9 is at a low level. However, the SCR 9 turns on once the input of the gate terminal 9B goes high and then turns on until the input of the anode terminal 9A goes low even if the input of the gate terminal 9B goes low. Keep on state. For this reason, the emitter terminal of the light receiving element 21B continues to be grounded via the SCR 9, the anode voltage of the SCR 9 becomes low level, and the enable signal S1 in the off state is output.

When the operation member 4 moves from the intermediate operation position PB to the non-operation position PA, The light-shielding portions 61A and 61B of the photoelectric sensor 21 oppose the photoelectric sensors 21 and 22 respectively, and the light-receiving elements 2IB and 22B of the photoelectric sensors 21 and 22 emit light. The element is turned off without receiving light of 21 A and 22 A. Therefore, the anode terminal 9A and the gate terminal 9B of the SCR 9 are both at the low level, and the enable signal S1 in the off state is output.

As described above, in the enable switch 10, after the input of the gate terminal 9B once becomes the high level in the SCR 9 constituting the signal output circuit, the input of the gate terminal 9B becomes the mouth level. Also, by utilizing the fact that the conductive state is maintained until the input of the anode terminal 9A becomes low level, the enable signal S1 is turned on when the operating member 4 is at the intermediate operating position PB when operating the operating member 4. On the other hand, when the operation member 4 is returned after being moved to the complete operation position PC, the enable signal S1 is turned off when the operation member 4 is at the intermediate operation position PB.

Thus, the enable switch 10 changes the combination of the on / off state of the light receiving elements 21B and 22B by the displacement of the shirt 6 due to the movement of the operation member 4, and the non-operation position of the operation member 4. PA, intermediate operation position PB, or complete operation position PC, each of which is different, and the signal output circuit makes the enable signal ON only at the intermediate operation position PB of operation member 4 during operation. 1 B, 22 B ON Z OFF state is selected. For this reason, the state of the enable signal is changed during the reciprocation of the operation member 4 without using a complicated mechanism for transmitting the operation of the operation member 4 to the switch in a different state between the operation and the return. Irreversibly, the enable signal S 1 when the operating member 4 is at the intermediate operating position PB can be turned on when the operating member 4 is closed and turned off when the operating member 4 returns, The size and cost of the switch can be reduced.

In the configuration shown in FIGS. 1 to 3, the photoelectric sensors 21 and 22 are arranged vertically in the enable switch 10 so that the lower part 6 A and the upper part Although the section 6B is shielded from light in different states, as shown in FIG. 4 (A), the photoelectric sensors 21 and 22 are respectively opposed to the right and left sides of the shutter 6 so as to face each other. It can also be arranged in the direction. In this case, as shown in FIG. 4 (B), the light-shielding portions 61A ', 61B', 62B 'and the light-transmitting portion 62A are provided on the left side 6A' and the right side 6B 'of the shirt 6. , 63 A 'and 63 B'. The shutter 6 only needs to move relatively to the photoelectric sensors 21 and 22, and the photoelectric sensors 21 and 22 can be moved together with the operation member 4 with respect to the shutter 6 fixed in the housing 1. it can.

Further, in the configurations shown in FIGS. 1 to 4, the signal detection circuit is configured by the SCR 9, but may be configured by an equivalent circuit including a combination of transistors or a logic circuit. FIG. 5 is a diagram showing an equivalent circuit of SCR 9 using two transistors TR1 and TR2. The same operation as SCR 9 can also be performed by an IC circuit in which the emitter terminals of the photoelectric switches 21 and 22 are connected to the input terminals.

Further, the switch and the signal detection circuit can be configured as shown in FIG. 6, for example. In FIG. 6, the photoelectric sensors 21, 22 are arranged vertically, but they may be arranged horizontally. In this case, the upper part (61B, 62B, 63B) and the lower part (61A, 62A, 63A) of the shirt 6 are arranged on the right and left sides.

In addition, in the configurations shown in FIGS. 1 to 6, transmissive photosensors were used as the photoelectric sensors 21 and 22, but as shown in FIG. 7, the transmissive portions 62A, 63. 618 and the light-shielding parts 61, 61B, and 62B are each reflected (e.g., white) 62 62, 63A〃, 61B〃 and non-reflective (black) 61A ", 6B In addition to using the reflector 6 "made of 1B" and 62, it is also possible to use the reflection type photosensors PS1 and PS2. In this case, for example, the reflector 6 is replaced with a non-reflective portion on the surface of the aluminum plate. It can be configured by applying black ink to the surface. Further, instead of the photoelectric sensors 21 and 22, a magnetic sensor such as a Hall element can be used. In this case, a method of displacing the magnet facing the magnetic sensor with the movement of the operating member 4 as shown in FIGS. 8A and 8B, and a method of displacing the magnetic sensor and the magnet as shown in FIG. A magnetic shield plate displaced with the movement of the operating member 4 can be arranged between the two. In the configuration shown in Fig. 8 (A), the moving plate 1 that moves with the movement of the operating member 4 is considered. Fix the magnets 117A to 117C at predetermined positions in the vertical direction of 16 (the direction parallel to the direction of movement of the operation member 4), and attach the magnets 117A to 117C in the vertical direction. The magnetic sensors 121A and 122A arranged side by side are opposed to each other with a predetermined gap.

In the configuration shown in FIG. 8B, the magnet 117 A is positioned at a predetermined position in the left and right direction (the direction orthogonal to the direction of movement of the operation member 4) of the moving plate 1 16 that moves with the movement of the operation member 4. The magnets 117A to 117C are fixed to each other, and the magnets 117A to 117C are arranged side by side in the left-right direction.

In the configuration shown in FIG. 8 (C), the magnetic shielding plate 106 having a partially cutout is moved between the magnetic sensors 121A and 122A and the magnets 121B and 122B. Is displaced along with.

As shown in FIG. 8 (D), the magnets 121 B and 122 B are arranged by arranging the magnetic body 123 so as to face the magnets 121 B and 122 B with the magnetic sensors 121 A and 122 A interposed therebetween. By specifying the direction of the magnetic field from B, 122 A can be operated accurately according to the displacement of the magnetic sensor 121 A and the magnets 12 IB and 122 B. The magnets 121B and 122B shown in FIGS. 8A, 8B and 8C and the magnetic shielding plate 106 shown in FIG. It should move relatively to 121 A and 122 A. FIG. 9 is a configuration of a signal output circuit applied to the switch configured as shown in FIG. 8A and a timing chart of signals in main parts. In the example shown in Fig. 8, the output terminals of the magnetic sensors 121A and 122A are connected to the base terminals of the transistors 118 and 119, respectively, and the collector terminal of the transistor 118 is connected to the SCR. Connected to the gate terminal 9B of transistor 9, the collector terminal of transistor 119 is connected to the anode terminal 9A of SCR 9, and the collector terminal of transistor 119 and anode terminal 9B of SCR 9 are connected. Is output as the enable signal S1.

In the configuration shown in FIG. 9, when the operation member 4 is pressed downward to move the operation member 4 and the operation member 4 is in the non-operation position PA, the magnet 117 A is attached to the magnetic sensor 122 A. At the same time, the magnet 117C faces the magnetic sensor 122A, and both the transistors 118, 119 turn on. Therefore, both the anode terminal 9A and the gate terminal 9B of the SCR 9 are at the one-level, and the enable signal S1 in the off state is output.

When the operating member 4 moves from the non-operating position PA to the intermediate operating position PB, the magnet 117B faces the magnetic sensor 121A, but the magnet 117C no longer faces the magnetic sensor 122A, and the transistor 11 1 9 turns off. Therefore, the level between the anode terminal 9A of SCR9 and the collector terminal of the transistor 119 becomes high level, and the enable signal S1 in the ON state is output.

Further, when the operating member 4 moves from the intermediate operating position PB to the complete operating position PC, the magnets no longer face both the magnetic sensors 121A and 122A, and both the transistors 118 and 119 are turned off. Turn off. Therefore, the gate terminal 9 B of SCR 9 goes high, turning on SCR 9, the collector terminal of transistor 119 is grounded via SCR 9, and the collector terminal of transistor 119 is connected to SCR 9. 9 Anode terminal 9 A is low level. As a result, the enable signal S1 in the off state is output.

Next, when the operating member 4 moves upward from the full operating position PC to the intermediate operating position PB when the operating member 4 moves upward, the magnet 11 1 is moved only to the magnetic sensor 12 1 A. 7 B opposes and only transistor 118 turns on. Therefore, the level between the anode terminal 9A of the SCR 9 and the collector terminal of the transistor 119 is maintained at a high level, and the input of the gate terminal 9B of the SCR 9 is at a low level. However, when the input of the gate terminal 9B goes high once and turns on, the SCR 9 continues to operate until the input of the anode terminal 9A goes low even if the input of the gate terminal 9B goes low. Maintain ON state. As a result, the collector terminal of the transistor 119 is kept grounded via the SCR 9, and the level between the anode terminal 9A of the SCR 9 and the collector terminal of the transistor 119 is kept low, and the transistor 119 is turned off. Is output.

When the operating member 4 moves from the intermediate operation position PB to the non-operation position PA, the magnet 1 17 A faces the magnetic sensor 1 21 A, and the magnet 1 17 C faces the magnetic sensor 1 2 2 A, Both evenings 1 18 and 1 19 turn on. Therefore, the anode terminal 9A and the gate terminal 9B of the SCR 9 are both at the low level, and the enable signal S1 in the off state is output.

As described above, even when the magnetic sensors 122 A and 122 A are used, as shown in FIG. 9B, the configuration is similar to the configuration using the photoelectric sensors shown in FIGS. In the SCR 9 that constitutes the signal output circuit, once the input of the gate terminal 9 B goes high once the input of the gate terminal 9 B goes low, the input of the anode terminal 9 A goes low. By maintaining the conduction state until the operating member 4 is operated, when the operating member 4 is operated, the enable signal S1 is turned on when the operating member 4 is at the intermediate operating position PB, while the operating member 4 is turned on. When returning, when the operating member 4 is at the intermediate operating position PB, the enable signal S1 is turned off. Can be turned off.

FIG. 10 is a front sectional view showing a configuration of an enable switch according to another embodiment of the present invention and a timing chart of signals. As shown in FIG. 10 (A), this rice switch 200 includes two sets of photoelectric sensors 21 and 22 and a switch 6 inside a housing 201 and a It has four monitor switches 210A to 210D for detecting the position. The monitor switches 210A to 210D are, for example, photoelectric sensors (transmission type photosensors).

Between the light emitting element and the light receiving element of each of the monitor switches 210A and 210B, a detection piece 220 extending downward from the inner surface of the operation member 204 faces. A detecting piece 221 extending downward from the inner surface of the operation member 204 faces between the light emitting element and the light receiving element of each of the monitor switches 210C and 210D. The detection piece 221 is shorter than the detection piece 220 by the distance between the non-operation position of the operation member 4 and the intermediate operation position.

As shown in FIG. 10 (B), only when the operation member 204 is at the intermediate operation position PB during operation, the enable signal S 1 A in the ON state from the signal output circuit formed on the boards 203 A and 203 B. , SIB are output. When the operation member 4 is at the non-operation position PA, all the output signals (monitor signals) of the monitor switches 21 OA to 210D are turned on, and when the operation member 4 is at the intermediate operation position PB, the monitor is turned on. When the output signals of the switches 210C and 210D are turned on and the operation member 4 is at the fully operated position PC, all the output signals of the monitor switches 210A to 210D are turned off. That is, the monitor switches 21 OA, 210 B and the monitor switches 210 C, 210 D output the same monitor signal.

In FIG. 10B, the right arrow indicates the operation of the operation member 204, and the left arrow indicates the return of the operation member 204.

Thus, according to the configuration shown in FIG. 10, the non-contact type switch and the non-contact type Since two sets of point type monitor switches are provided and the enable signal and the monitor signal are output twice, even if one of the switches or the monitor switch fails, the enable signal and the monitor signal are reliably output. Can be output, further improving reliability.

FIGS. 11 (A) to 11 (C) show a switch configuration, a circuit diagram of a signal output circuit, and a switch on state according to the position of an operation member in an enable switch according to still another embodiment of the present invention. It is a figure showing a Z off state. FIGS. 12A to 12C are diagrams showing the operation state of the switch. The enable switch 300 according to this embodiment includes an operation member 304 on the lower surface of which the two conductors 313A and 313B abut. The upper ends of the conductive springs 312A and 312B are fixed to the lower surfaces of the conductors 313A and 313B, and the movable contacts 31 1A are connected to the lower ends of the conductive springs 312A and 312B. A, 3 1 1 B are installed. The movable contacts 311A and 311B face the fixed contacts 310A and 310B. The effective length of the conductive spring 312A is longer than the effective length of the conductive spring 312B by the moving distance from the intermediate operation position of the operation member 304 to the complete operation position. The movable contact 311A and the fixed contact 310A, and the movable contact 311B and the fixed contact 3110B correspond to the first switch element 320 and the second switch element 321 of the present invention. .

When the operating member 304 is in the non-operating position PA as shown in FIG. 12 (A), both the movable contacts 311A and 311B do not contact the fixed contacts 31OA and 310B. When the operating member 304 is in the intermediate operating position PB as shown in FIG. 12 (B), only the movable contact 31 1 A comes into contact with the fixed contact 3 1 OA, and as shown in FIG. 12 (C), the operating member When 304 is in the completely operating position PC, both the movable contacts 311A and 311B contact the fixed contacts 31OA and 310B. Thus, when the operating member 304 is in each of the non-operating position PA, the intermediate device position PB, and the fully operating position PC, the first switch element 3 20 and the second switch element 321 turn on / off as shown in FIG. 11 (C).

As shown in Figure 11 (B), switch element 320 is connected to anode terminal 9 A of SCR 9 and switch 32 1 element is connected to gate terminal 9 B. of SCR 9 to form a signal output circuit. Have been. In the signal output circuit, the input of the anode terminal 9A of the SCR 9 is output as the enable signal S1. In the configuration shown in FIG. 11, when the operating member 4 is pressed downward to move the operating member 4 and the operating member 304 is in the non-operation position PA, the switch elements 320 and 321 are both opened. ing. Therefore, the anode terminal 9A and the gate terminal 9B of the SCR 9 are both at the low level, and the enable signal S1 in the off state is output.

When the operation member 304 moves from the non-operation position P A to the intermediate operation position PB, only the switch element 320 is closed. Therefore, the level between the anode terminal 9A of the SCR 9 and the switch element 320 becomes high level, and the enable signal S1 in the ON state is output.

Further, when the operation member 4 moves from the intermediate operation position PB to the full operation position PC, the switch elements 320 and 321 are both closed. Therefore, the gate terminal 9B of the SCR 9 goes high, the SCR 9 turns on, the switch element 320 is grounded via the SCR 9, and the switch element 320 and the anode terminal 9A of the SCR 9 are connected. The enable signal S1 in the off state is output by setting the period to the mouth level.

Next, when the operation member 4 moves upward from the full operation position PC to the intermediate operation position PB when the operation member 4 moves upward, only the switch element 320 is closed, and the switch element 320 is closed. 321 is opened. Therefore, the voltage between the anode terminal 9A of the SCR 9 and the switch 320 is maintained at a high level, and the input of the gate terminal 9B of the SCR 9 is at a low level. However, SCR 9 turns off once the input of gate terminal 9 B goes high. Then, even if the input of the gate terminal 9B becomes low level thereafter, the on state is maintained until the input of the node terminal 9A becomes low level. As a result, the switch element 320 is kept grounded via the SCR 9, and the level between the anode terminal 9A of the SCR 9 and the switch element 320 is kept at a low level. The signal S1 is output.

When the operating member 4 moves from the intermediate operating position PB to the non-operating position PA, both of the switch elements 32 0 and 32 1 are opened. Therefore, both the anode terminal 9A and the gate terminal 9B of the SCR 9 are at the low level, and the enable signal S1 in the off state is output.

As described above, even when the switch elements 320 and 321, which are contact-type switch elements, are used, the signal output circuit is similar to the configuration using the photoelectric sensor shown in FIGS. Once the input of the gate terminal 9B goes high once in the SCR 9, the conduction state continues until the input of the anode terminal 9A goes low even if the input of the gate terminal 9B goes low. Utilizing the maintenance, when the operation member 4 is operated, the enable signal S1 is turned on when the operation member 4 is at the intermediate operation position PB, and when the operation member 4 is returned, the operation member 4 is operated by the intermediate operation. The enable signal S 1 can be turned off when in the position PB.

In each of the embodiments described above, the signal output circuit is arranged in the housing of the enable switch, but the ON / OFF signal is output from the switch provided in the housing of the enable switch to the outside of the housing of the enable switch. The signal may be supplied to a signal output circuit provided in the device. In this case, the three-position enable device of the present invention is constituted by the housing provided with the switch inside and the signal output circuit outside the housing.

Claims

The scope of the claims

1. An operation member that moves from the non-operation position to the full operation position via the intermediate operation position during operation, and moves from the full operation position to the non-operation position via the intermediate operation position when returning,

At least one switch including a plurality of switch elements that are turned on and off in different combinations at each of the non-operation position, the intermediate operation position, and the full operation position of the operation member, and a plurality of switch elements in each switch. A signal that outputs an ON signal only at the intermediate operation position when operating the operation member based on the combination of the ON / OFF state, and outputs an OFF signal at the non-operation position, full operation position, and intermediate operation position when returning the operation member. An output circuit and a three-position enable device.

2. The first switch element, wherein the switch is different from an off-Z off state when the operating member is in the non-operating position and an on-Z off state when the operating member is in the intermediate operating position and the fully operating position; And a second switch element that is different in an off-Z on state when the operating member is in the non-operating position and the intermediate operating position and an on / off state when the operating member is in the full operating position, and the signal output circuit The three-position enable device according to claim 1, wherein the first or second switch element is kept in an off state in a completely operated position at an intermediate device position when the operation member is returned.

3. The three-position enabling device according to claim 1, wherein the switch is constituted by a plurality of contactless switch elements.

4. The switch includes first and second optical sensors each including a light-emitting element and a light-receiving element, and a shirt whose light-transmitting state at a position facing the light-emitting element changes in conjunction with the operation member, or The three-position enable device according to claim 3, further comprising: a reflector that changes a reflection state.

5. The switch includes first and second switch elements each including a magnetic sensor, and a magnet separated from or close to the magnetic sensor in conjunction with the operation member. 3-position enabling device as described in.

6. The three-position enable device according to claim 1, wherein the switch is constituted by a plurality of contact type switch elements.

7. The at least one monitor switch for outputting a signal for identifying whether the operating member is in a non-operating position, an intermediate operating position, or a full operating position. 6. The three-position enabling device according to any one of 6.