WO2006095645A1 - 安全スイッチ - Google Patents
安全スイッチ Download PDFInfo
- Publication number
- WO2006095645A1 WO2006095645A1 PCT/JP2006/304076 JP2006304076W WO2006095645A1 WO 2006095645 A1 WO2006095645 A1 WO 2006095645A1 JP 2006304076 W JP2006304076 W JP 2006304076W WO 2006095645 A1 WO2006095645 A1 WO 2006095645A1
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- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- lock
- drive cam
- switch
- contact
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/24—Interlocking, locking, or latching mechanisms for interlocking two or more parts of the mechanism for operating contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
- H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
Definitions
- the present invention relates to a safety switch that is attached to a peripheral wall surface of an industrial machine or the like, for example, and stops power supply to the industrial machine or the like when the protective door is opened.
- a safety switch is provided to prevent the motor from being driven.
- a safety switch for example, as in the safety switch described in Patent Document 1, after the operation key is inserted into the safety switch, the operation key is mechanically locked in the safety switch. Accordingly, there is a device provided with a lock mechanism that prevents the operation key from being pulled out.
- a safety switch having the lock function is electrically connected to an industrial machine such as a robot, and is composed of a switch body (key switch) and an actuator (key).
- the switch body is a protective door. It is fixed to the peripheral wall and the actuator is fixed to the protective door. The fixed position of the actuator at that time is set so as to be able to enter the head case on the upper left side of the switch body when the protective door is closed and the protective door is closed. .
- the contact of the switch body located below the head case of the switch body is closed by the entry of the actuator, and power is supplied to the industrial machine so that the machine can be driven.
- the actuator is retracted due to the opening of the protective door and comes out of the head case, the built-in contact is switched to open and the power supply to the machine is cut off.
- the head case is disposed below the cam body (drive cam) that rotates in association with the actuator as the actuator enters and retreats, and the cam body rotates. Accordingly, a follower that moves up and down along the cam outer shape (cam curve portion) is provided.
- An operation body and an operation body that move up and down in conjunction with the driven body and contacts that open and close in conjunction with the operation body are disposed inside the switch body below the head case.
- the driven body, the operating body, and the operating body are urged upward by the panel provided near the operating body.
- the driven body slides on the cam outer shape of the cam body, and the driven body is rotated as the cam body rotates.
- the actuating body and the operating body move up and down integrally, and the open / close state of each contact is switched in conjunction with the up and down movement.
- the safety switch is provided with a lock mechanism having a lock member (lock body) that moves to the left and right, an L-shaped lock lever, and a plunger.
- the lock lever is pivotally supported at the center, the left end of the lock lever is rotatably connected to the right end of the lock member, and the right end is rotatably connected to the lower end of the plunger. And transmitted to the lock member.
- the lock member is urged to the left by the panel. Therefore, as the cam body rotates in the clockwise direction, the driven body slides into contact with the outer diameter of the cam body from the larger diameter portion to the smaller diameter portion, and the operating body moves upward due to the biasing of the panel. The member moves to the left. As a result, the lock member enters below the operating body, and the downward movement of the operating body is blocked by the lock member, so that the cam body is locked by the driven body, thereby The locked state is prevented from rotating, and the actuator is prevented from being pulled out.
- an electromagnetic solenoid force for driving the plunger of the lock mechanism is disposed at the upper right portion in the switch body, and the electromagnetic solenoid is energized and de-energized by external control, whereby the plunger Move up and down respectively.
- the electromagnetic solenoid is in a state where the energization is cut off.
- the electromagnetic solenoid is energized from this state, the plunger is moved up by the electromagnetic attractive force, and the lock lever is moved by the upward movement of the plunger. Rotates counterclockwise, whereby the lock member moves to the right, allowing the operating body to move downward, and the cam body to rotate counterclockwise. As a result, the cam body is released from the locked state to the unlocked state, and the actuator can be pulled out.
- Patent Document 1 Japanese Patent Laid-Open No. 9-245584 ([0035] to [0044], FIG. 1)
- the drive cam (cam body) is in the locked state. Therefore, the actuator that has been prevented from being pulled out
- the force in the pulling direction that exceeds the breaking strength of the cam curve (cam outer shape) of the drive cam is forcibly applied to the actuator without being unlocked normally by energization of the electromagnetic solenoid. If added, the following problems may occur. In other words, when the actuator is pulled backward by pulling it forcefully, it becomes a force to rotate the drive cam with which the actuator is engaged. However, since the force electromagnetic solenoid is not energized, the lock mechanism remains in the locked state, and the follower (operating rod) remains engaged with the small diameter portion of the cam curve portion of the drive cam. Therefore, if the force to pull out the actuator is large, the cam curve will be damaged beyond the breaking strength of the cam curve, the drive cam will be able to rotate, and the actuator will rotate as it is pulled out. It will be.
- the present invention has been made in view of the above problems, and even if the actuator is forcibly retracted from the switch body in the safety switch force S lock state having a lock function, the switch of the actuator is provided.
- the object is to provide a safety switch that can reliably detect retraction from the body.
- the safety switch according to the present invention is provided with an actuator that can be freely moved into and out of the operating portion of the switch body, and is provided in the switch portion in accordance with the entering and retracting of the actuator.
- the drive cam provided rotatably on the operation portion and the lock of the switch body And a lock mechanism that locks the rotation of the drive cam.
- the drive cam has an engagement portion, a notch portion, and a cam curve portion formed on an outer peripheral surface thereof, and the push-in of the actuator is performed.
- a part of the actuator is engaged with the engaging portion, and as the actuator enters the operating portion while being in the engaged state. It is rotated in one direction, before As the actuator is withdrawn, the actuator is rotated in the other direction until the actuator is retracted from the operation portion until a part of the actuator is disengaged from the engagement portion.
- the operating rod reciprocates as the operating rod slides on the cam curve portion, and the lock mechanism moves between the locked position and the unlocked position with respect to the rotational axis of the drive cam.
- the actuator is provided so as to be movable in a substantially orthogonal direction, and when the actuator is in the approaching state, it engages with the notch by moving to the lock position to lock the rotation of the drive cam, and moves to the unlock position.
- a lock body that is disengaged from the notch by movement of the lock and a drive unit that moves the lock body (claim 1). Section).
- the distal end portion of the lock body may be engaged with the notch portion, and the breaking strength of the distal end portion may be set lower than the breaking strength of the notch portion of the drive cam. Range 2). Further, it is desirable that the lock body includes a base portion and a tip portion continuous with the base portion, and a defect portion for reducing the breaking strength is formed at a boundary portion between the tip portion and the base portion. Furthermore, it is desirable that the lock body includes a base portion and a tip portion continuous with the base portion, and the tip portion is bonded to the base portion.
- the breaking strength of the distal end portion of the lock body is set lower than the breaking strength of the notch portion of the drive cam. It is easier to break than the part. Therefore, if the actuator is forcibly pulled out of the switch body while the actuator has entered the safety switch and the drive cam is locked by the locking body engaging the notch, The force concentrates on the engaging part between the lock body that locks the drive cam and the notch, but the tip of the lock body, which has low breaking strength, breaks before the notch of the drive cam, and the drive The cam becomes rotatable. In this way, when the actuator is forcibly pulled out from the switch body, only the tip of the lock body is damaged, and the other parts constituting the safety switch remain in a normal state. Therefore, if only the broken lock body is replaced, the safety switch can be used again in a normal state, so that low cost can be realized.
- the contact portion is electrically connected to an end portion of an external connection cable in the switch body, and the actuator enters and retracts according to an electric signal generated by opening and closing the contact of the contact portion.
- the structure which is what is detected may be sufficient. With such a configuration, it is possible to detect the entry / retreat of the actuator from the outside by an electrical signal generated by opening / closing the contact of the contact portion.
- the contact portion includes a normally open contact provided in the switch body and a normally closed contact used for operation control of an external device, and the operation according to the entrance of the actuator.
- the open state of the normally open contact provides an electrical signal for detecting the entrance of the actuator, and the normally closed contact.
- a configuration may be adopted in which the external device is rendered inoperable and operable by the closed state of the contact. With this configuration, the normally closed contact is closed with the entry of the actuator, and the external device is changed from the inoperable state to the operable state, while the normally open contact is opened with the entry of the actuator. It becomes. In this way, by monitoring the open / close state of the normally open contact that performs the open / close operation opposite to the normally closed contact, in addition to the actuator entering and retracting, the state of the external device can be confirmed from the outside.
- the drive unit is provided in the lock mechanism unit and a central axis direction of the drive unit is arranged substantially orthogonal to the moving direction of the lock body, and by energizing the hinge type electromagnet
- a configuration may be provided that includes a transmission unit that is displaced by receiving an electromagnetic attraction force, transmits the displacement to the lock body, and moves the lock body (Claim 3).
- the hinge type electromagnet is arranged so that the central axis direction thereof is almost perpendicular to the moving direction of the lock body, and the electromagnetic attraction force generated by energizing the hinge type electromagnet works.
- the lock body is moved by deflecting the direction through the transmission section and transmitting the direction to the lock body.
- the switch body has a rectangular parallelepiped shape, and an actuator advancement inlet is formed at one of a pair of corners of the switch body facing each other, and a cable outlet is formed at the other, respectively.
- Roca cable force It may be configured to be pulled out in a direction connecting substantially the pair of opposite corners (claim 4).
- a safety switch with a high degree of freedom in the cable pull-out direction can be installed on the wall surface or protective door due to the relationship between the actuator entrance and the cable pull-out port.
- the actuator entrance can be installed either horizontally or vertically.
- the safety switch can be attached to the installation location on either side. Therefore, The degree of freedom for mounting the safety switch is increased and the selection range for mounting the safety switch can be expanded.
- the lock body of the lock mechanism may be configured as a unit that is arranged so as to be incorporated into and removed from the drive unit.
- the lock body is unitized and installed in the drive unit so that it can be assembled and removed. Therefore, even if the lock body is damaged, this unit can be replaced. It is possible to restore the safety switch efficiently in a short time.
- the actuator is forcibly retracted and pulled out from the operating portion while the rotation of the drive cam is locked. Even in this case, at least one of the notch portion of the drive cam or the lock body is destroyed, the drive cam becomes rotatable, and the operation rod moves while sliding on the cam curve portion of the drive cam. Since the contacts of the contact part normally open and close, for example, the pulling out (retracting) of the actuator can be detected based on the opening and closing of this contact, and the retracting of the actuator from the switch body can be detected. It can be detected reliably.
- the hinge type electromagnet is disposed so that the central axis direction thereof is substantially perpendicular to the moving direction of the lock body.
- the electromagnetic attraction force is linearly changed like a plunger type electromagnet. Compared to using it regularly, it is possible to provide a thin and small safety switch.
- the safety switch can be disposed on the wall surface or the protective door because of the relationship between the actuator entrance and the cape outlet.
- the actuator entrance can be arranged either horizontally or vertically.
- the safety switch can be attached to the installation location on either side. Therefore, the degree of freedom for mounting the safety switch is increased and the selection range for mounting the safety switch can be expanded.
- FIG. 1 is a cross-sectional view of a switch body in a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the switch body in the first embodiment of the present invention.
- FIG. 3 is a sectional view of the switch body in the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view of the switch body in the first embodiment of the present invention.
- FIG. 5 is an external view of a safety switch according to the first embodiment of the present invention.
- FIG. 6 is a view showing a lock body unit according to a second embodiment of the present invention.
- FIG. 7 is a view showing a lock body according to another embodiment of the present invention.
- Fig. 4 is a cross-sectional view of the switch body
- Fig. 5 is an external view of the safety switch.
- the safety switch according to the present invention is a switch that is electrically connected to an external machine such as a robot, such as an industrial machine, through a cable in substantially the same manner as the conventional one described above.
- FIG. 1 it is composed of a switch body 1 and an actuator 3.
- the switch body 1 includes the operation unit 5, the switch unit 7, and the lock mechanism unit 8, and is fixed to the wall surface of the protective door peripheral edge of an industrial machine (not shown).
- the actuator 3 is fixed to the protective door, and the position thereof is a position facing the actuator entrance 9a formed on the side surface of the operation unit 5. Enter the entrance 9a.
- the actuator 3 includes a base portion 3a, a pair of pressing pieces 3b protruding from the base portion 3a, and a connecting piece 3c that connects the pressing pieces 3b to each other.
- both pressing pieces 3b have a small width and a thick shape, and the cross section passing through the connecting piece 3c has a U-shape.
- the operation unit 5 disposed in the upper left part of the switch body 1 has a case member 11 and a rotary shaft 13 pivotally supported on the inner surface of the case member 11. And a drive cam 15 supported rotatably.
- An engaging portion 15a into which the connecting piece 3c of the actuator 3 is fitted is inserted into the upper portion of the outer peripheral surface of the drive cam 15 from the above-mentioned actuator entrance 9a. Formed in position.
- a cutout portion 15b is formed on the outer peripheral surface of the drive cam 15 to engage a lock body 80 of the lock mechanism portion 8 described later.
- a cam curve portion 15c is formed at the lower outer peripheral surface of the drive cam 15, and an operation rod 21 whose tip portion protrudes into the operation portion 5 from the switch portion 7 located below the operation portion 5 so as to be freely retractable.
- the hemispherical tip of the cam contacts the cam curve portion 15c of the drive cam 15.
- the switch portion 7 is disposed inside the case member 33 which forms a rectangular parallelepiped switch body 1 integrally with the case member 11 and below the operation portion 5, It consists of the contact 70 with built-in and the operation rod 21 described above. Further, the case member 11 on the operation unit 5 side is detachably attached to the case member 33. A cable lead-out port 33a for an external connection cable is formed at a corner on the case member 33 side opposite to the corner on the case member 11 side where the actuator entry port 9a is formed. Further, as shown in FIG. 1, a pair of mounting holes 33b into which bolts for mounting the switch body 1 to the peripheral wall surface of the industrial machine are inserted on the outer surface of the case member 33.
- the contact portion 70 is in contact with the other end portion of the operation rod 21 and is moved together with the operation rod 21.
- the first and second members are opened and closed in conjunction with the movable member 37. It is equipped with normally closed contacts 39, 40. Each normally closed contact 39, 40 is powered by a movable terminal 39a, 40a and a fixed terminal 39b, 40b. Each movable terminal 39a, 40a is fixed to a movable member 37, and each fixed terminal 39b, 40b is a contact part 70.
- the frame member 43 is fixed to the frame member 43.
- the normally closed contact 39 is for supplying and shutting off power to the industrial machine, and is in series with the normally closed contact disposed in the lock mechanism section 8 described later. It is connected .
- the normally closed contact 40 is used for monitoring the open / closed state of these power supply and shut-off contacts.
- the movable member 37 includes a plate-like substrate portion 45 and a first attachment portion 53 and a second attachment portion 54 that are erected on both ends of one surface of the substrate portion 45 (the surface side in FIG. 1). One end of which is in contact with the other end of the operating rod 21 and the other end is a coil panel (not shown). The movable member 37 is biased in the direction of the operation unit 5, that is, upward by the coil panel.
- a pair of protrusions 53 a, 53 b, 54 a, 54 b are provided on the mounting portions 53, 54 so as to face each other in the longitudinal direction of the movable member 37.
- the movable terminals 39a, 40a of the first and second normally closed contacts 39, 40 are detachably attached to the roots of one of the protrusions 53a, 54a, and each pair of protrusions 53a, 53b, 54a, Each movable terminal 39a, 40a is pressed against and fixed to each mounting portion 53, 54 by a panel (not shown) that is externally fitted to each 54b.
- a panel not shown
- a cable (not shown) that is electrically connected to the industrial machine is attached to the case member 33, and the cable, the normally closed contacts 39, 40, and the galvanic power are connected to the inside of the contact portion 70.
- Electrically connected and electrical signals generated by opening and closing the normally closed contacts 39, 40 detect the entry / retreat of the actuator 3 to the operation section 5 and supply power to the industrial machine and shut off the power supply. Is going to be done.
- the fixed terminal 40b of the second normally closed contact 40 is detachably attached to a normally closed contact mounting portion 43a formed on the frame member 43 of the contact portion 70, as shown in FIG.
- the movable terminal 40a is mounted so that its mounting position and mounting state can be changed, and the second normally closed contact 40 can be switched to a normally open contact.
- the frame member 43 is formed with a normally open contact mounting portion 43b to which the fixed terminal 40b is detachably attached.
- the second normally closed contact 40 can be switched to a normally open contact. In this way, this normally open contact performs the switching operation opposite to that of the first normally closed contact 39, so it can be used as a monitoring contact that operates differently from the case of the second normally closed contact 40. Depending on the situation, selection between normally closed and normally open can be made.
- the lock mechanism portion 8 is disposed inside the case member 33 and to the right of the operation portion 5, and includes the lock body 80 and the drive portion 81 that moves the lock body 80. And a lock contact portion 8b having a normally open and normally closed contact, and a manual unlock mechanism 8c.
- the lock body 80 constituting the lock mechanism 8a is movable between the unlock position shown in FIG. 1 and the lock position shown in FIG. 2 in a direction substantially orthogonal to the rotating shaft 13 of the drive cam 15.
- the lock body support portion 801 supports the lock body.
- the outer diameter of the distal end portion 80a of the lock body 80 is configured to be smaller than the outer diameter of the base portion 80b.
- the drive unit 81 includes a hinge-type electromagnet 81a in which a coil is wound around a core, and a magnet such as a substantially L-shaped iron that is displaced by receiving an electromagnetic attraction force by energizing the hinge-type electromagnet 81a.
- An operating body 81b made of a material, a return panel 8lc formed of a plate panel that urges the operating body 81b to the left, and a link body 81d that transmits the displacement of the operating body 81b to the lock body 80 are configured.
- the hinge-type electromagnet 81a is disposed so that the central axis direction thereof is substantially orthogonal to the moving direction of the lock body 80, and is supported by the case 82 of the lock contact portion 8b. Further, as shown in FIG. 1, the hinge-type electromagnetic stone 81a is supported by the case 82 so that a gap 83 is formed between the hinge-type electromagnet 81a and the case 82, and the operating body 81b is returned to the gap 83.
- a panel 81c is provided.
- the actuating body 81b is a substantially L-shaped member configured such that the bent portion 81bl has an obtuse angle, and is arranged in the gap 83 so as to be swingable with the bent portion 81bl as a center axis of swinging. It is installed.
- the return panel 81c is disposed in the gap 83 and to the right of the operating body 81b so that the biasing force is directed to the left.
- the upper end 81b2 of the operating body 81b is linked to the link body 81b. d is connected, and the lock body 80 is pivotally supported by the link body 81d.
- the hinge type electromagnet 8 la if the hinge type electromagnet 8 la is energized, the operating body 81b is biased to the left by the return panel 81c, and the upper end 81b2 swings the bent portion 81bl. Move to the left as the center axis of movement. As the upper end portion 81b2 moves to the left, the link body 81d connected to the upper end portion 81b2 moves to the left, and the lock body 80 pivotally supported by the link body 81d is illustrated. 2 Moves to the direction of the arrow, that is, the lock position.
- the hinge type electromagnet 81a if the hinge type electromagnet 81a is energized, the lower left end 81b3 of the operating body 81b is attracted to the hinge type electromagnet 81a by the electromagnetic attraction force of the hinge type electromagnet 81a.
- the upper end portion 81b2 of the operating body 81b moves to the right while using the bent portion 81bl as the center axis of oscillation while resisting the urging force of the return spring 81c.
- the link body 81d connected to the upper end 81b2 moves to the right, and the lock body 80 pivotally supported by the link body 81d is illustrated. Move to the direction of the arrow in 3, ie, unlock position.
- the operating body 81b and the link body 81d function as the “transmission portion” of the present invention.
- normally open and normally closed contacts are disposed in the case 82 of the lock contact portion 8b (not shown). Of these normally open and normally closed contacts, the movable contact is supported by the link body 81d. Therefore, these movable contacts move in the same direction in conjunction with the movement of the link body 81d.
- the normally open and normally closed contacts are opened and closed, respectively, and the link body 8 Id Is moved to the right, that is, when the lock body 80 is moved to the unlock position, the normally open and normally closed contacts are configured to be in the closed and open states, respectively.
- the normally closed contact in the case 82 and the normally closed contact 39 connected to the industrial machine among the contacts disposed in the contact portion 70 are connected in series. . Further, the operation of the lock body 80 can be detected by monitoring the electrical signals of these normally open contacts.
- the manual unlocking mechanism 8c includes a release cam 84 having a convex portion 84a.
- the release cam 84 is released from the outside of the switch body 1 by a release key or the like.
- the clock The locked state can be released by rotating it around. That is, by rotating the release force rod 84 in the clockwise direction, the link body 81d can be moved to the right while the convex portion 84a is in sliding contact with the link body 81d.
- the connecting piece 3c of the actuator 3 is engaged with the engagement section 15a of the drive cam 15 as shown in FIG.
- the drive cam 15 is rotated in the clockwise direction as the actuator 3 enters.
- the operating rod 21 moves upward by the biasing force of the coil panel while the tip of the operating rod 21 is in sliding contact with the large diameter partial force portion of the cam curve portion 15c.
- the normally closed contacts 39, 40 change from the open state to the closed state.
- the notch 15b moves to a position facing the lock body 80, so that the lock body 80 moves to the left by the urging force of the return spring 81c, and the notch 15b and the tip 80a of the lock body 80 are engaged, and the rotation of the drive cam 15 is locked, and the actuator 3 is prevented from being pulled out.
- the normally open and normally closed contacts of the lock contact portion 8b are switched to the open and closed states, respectively. Therefore, the normally closed contact of the lock contact portion 8b and the first normally closed contact 39 are simultaneously closed, so that the robot connected in series to these normally closed contacts Power is supplied to the industrial machine, and the industrial machine becomes operable.
- the hinge type electromagnet 81a when the hinge type electromagnet 81a is energized by external control, as shown in FIG. 3, the lower left end 81b3 of the operating body 81b is caused by the electromagnetic attractive force of the hinge type electromagnet 81a. Then, it is attracted toward the hinge type electromagnet 81a. Therefore, the upper end portion 81b2 of the operating body 81b moves to the right with the bent portion 81bl as the center axis of oscillation while resisting the urging force of the return spring 81c, so that the lock body 80 is moved to the right unlocked position. Moving.
- FIG. 2 when the actuator 3 is forcibly retracted and pulled out from the operation unit 5 while the rotation of the drive cam 15 is locked, FIG. 2 and FIG. The details will be described with reference to FIG.
- the connecting piece 3 c of the actuator 3 is engaged with the engaging portion 15 a of the drive cam 15, so that a forced rotational force is applied to the drive cam 15.
- the leading end 80a of the lock body 80 since the leading end 80a of the lock body 80 remains engaged with the notch 15b of the driving cam 15, the force for pulling out the actuator 3 is locked by the leading end of the driving cam 15. It concentrates on the engaging part of 80a and the notch 15b.
- the diameter of the tip 80a is reduced and the breaking strength of the tip 80a is set lower than the breaking strength of the notch 15b.
- the tip 80a of the lock body 80 having a low height is damaged before the notch 15b of the drive cam 15, so that the drive cam 15 can rotate.
- the drive cam 15 is rotated counterclockwise, and the connecting piece 3c of the actuator 3 is released from the engaged state with the engaging portion 15a. To do.
- the cam curve portion 15c and the operating rod 21 of the drive cam 15 are in a normal state without being damaged, so that the drive cam 15 is rotated in the counterclockwise direction. Accordingly, the operating rod 21 moves downward while resisting the urging force of the coil panel while the operating rod 21 is in sliding contact with the small diameter large portion of the cam curve portion 15c.
- the normally closed contacts 39 and 40 of the contact portion 70 are normally opened. In other words, the normally closed contacts 39 and 40 of the contact section 70 are operating normally. Therefore, the extraction (retraction) of the actuator 3 is detected based on the state of these normally closed contacts 39 and 40, and The power to the machine is reliably shut off.
- the lock body 80 having a low breaking strength is obtained by forcibly retracting the actuator 3 and pulling it out from the operation portion 5 while the rotation of the drive cam 15 is locked. Even when the drive cam 15 is in a rotatable state due to damage, the cam curve portion 15c of the drive cam 15 and the operation rod 21 are in a normal state without being damaged. Therefore, when the actuator 3 is retracted from the operating portion 5, the drive cam 15 is rotated counterclockwise and the connecting piece 3c of the actuator 3 is released from the engaged state with the engaging portion 15a. The operating rod 21 moves downward while the operating rod 21 is in sliding contact from the small diameter portion of the cam curve portion 15c to the large diameter portion.
- the normally closed contacts 39, 40 of the contact section 70 are normally switched to the open state. Therefore, the actuator 3 is pulled out based on the state of the normally closed contact ( Treatment) can be detected. Therefore, even when the protective door or the like is forcibly opened without being unlocked and the actuator 3 is pulled out of the switch body 1, the backward movement of the actuator 3 from the switch body 1 can be detected reliably.
- the breaking strength of the tip 80a of the lock body 80 is set lower than the breaking strength of the notch 15b of the drive cam 15, the tip 80a of the lock 80 is more It is easier to break than the notch 15b of the drive cam 15. For this reason, even if the tip 80a of the lock body 80 is damaged, the safety switch can be used again in a normal state by replacing only the damaged lock body 80, so that low cost can be realized. it can.
- the state of entry / retraction of the actuator 3 into the operation section 5 is detected by an electric signal generated by opening and closing the normally closed contacts 39, 40 disposed in the contact section 70. Therefore, it is possible to detect the entry / retreat of the actuator 3 from the outside by an electrical signal generated by opening / closing the normally closed contacts 39, 40.
- the hinge type electromagnet 81a is disposed so that the direction of the core (center axis) is substantially orthogonal to the moving direction between the lock position and the unlock position of the lock body 80,
- the lock body 80 is moved by deflecting the direction in which the electromagnetic attractive force generated by energization of the hinge-type electromagnet 81a works through the operating body 81b and the link body 81d and transmitting it to the lock body 80. Therefore, for example, the safety switch as a whole can be made thinner and smaller than when the electromagnetic attractive force is linearly used as in a plunger type electromagnet.
- the switch body 1 has a rectangular parallelepiped shape, and an actuator advance inlet 9a is formed at one of a pair of opposite corners of the switch body 1, and a cable outlet 33a is formed at the other.
- an actuator advance inlet 9a is formed at one of a pair of opposite corners of the switch body 1, and a cable outlet 33a is formed at the other.
- the switch can be installed on the wall surface or protective door.
- the actuator entrance can be placed either horizontally or vertically.
- the safety switch can be attached to the installation location, either side of the front or back. Therefore, the degree of freedom for mounting the safety switch is increased and the selection range for mounting the safety switch can be expanded.
- Fig. 5 (a) is a diagram with the front surface of the safety switch facing up
- Fig. 5 (b) is a diagram with the back surface of the safety switch facing up.
- FIG. 6 is a view showing a lock body unit that works according to the present invention.
- a second embodiment of the safety switch that works according to the present invention will be described in detail with reference to FIG.
- the second embodiment is greatly different from the first embodiment in that the lock body of the lock mechanism is unitized and arranged so as to be incorporated into and removed from the drive unit.
- Other configurations and operations are the same as those in the first embodiment.
- the second embodiment will be described in detail focusing on the differences from the first embodiment. Note that the description of the same configuration and operation as those of the first embodiment is omitted.
- the lock body unit 802 includes a lock body support portion 802c and a seal member.
- the lock body 802d is supported by 802a and 802b.
- the mouth unit 802 is disposed above and below the hinge type electromagnet 8 la constituting the drive unit so as to be freely attached and detached.
- the lock body 802d is composed of a base 802e and a tip 802f continuous to the base 802e, and a hole 802g is formed at the boundary between the base 802e and the tip 802f to reduce the breaking strength. Has been.
- the lock body 802d is unitized as the lock body unit 802, and is installed in the drive unit so as to be detachable. Therefore, even if the lock body 802d is damaged, this lock If the body unit 802 is replaced, the safety switch can be restored efficiently in a short time.
- the hole 802g for reducing the breaking strength of the tip 802f of the lock body 802d is provided, when the actuator is forcibly pulled out of the safety switch body, the tip 802f of the lock body 802d is securely inserted. It can be damaged first, and the drive cam notch can be maintained in a normal state. Accordingly, when the actuator is forcibly pulled out from the safety switch body, when the safety switch fails, the safety switch can be restored to the normal state only by replacing the lock unit 802.
- FIG. 7 shows the lock body.
- the lock body 804 shown in FIG. 7 (a) is composed of a base 804b and a tip 804a continuous to the base 804b, and a boundary portion between the tip 804a and the base 804b is provided with, for example, a groove for reducing the breaking strength.
- a shaped defect 804c is formed.
- 7B includes a base portion 803b and a distal end portion 803a continuous to the base portion 803b. The distal end portion 803a is formed by being bonded to the base portion 803b.
- the base 803b and the tip 803a may be either the same member or different members. With such a configuration, when the actuator is forcibly pulled out from the safety switch body, it is possible to reliably break the leading end portion of the lock body that is not in the notch portion of the drive cam.
- a structure in which the base portion and the tip portion are bonded together in the state in which the defect portion is provided may be used.
- one of the normally closed contacts disposed at the contact point may be a normally open contact.
- the normally closed contact point may be used for the operation control of the external device, and the normally open contact point may be a contact point for obtaining an electric signal for detecting the entrance of the actuator.
- the normally closed contact is closed as the actuator enters, and the external device changes from the inoperable state to the operable state, while the normally open contact opens as the actuator enters. It becomes a state. In this way, by monitoring the open / close state of the normally open contact that performs the opening / closing operation opposite to the normally closed contact, in addition to the actuator entering and retracting, the state of the external device can be confirmed from the outside. .
- the two normally closed contacts 39, 40 are used, and the power supply and the supply interruption to the industrial machine are performed by the opening / closing operation thereof. Even when the movable terminals 39a, 40a of the normally closed contacts 39, 40 and the fixed terminals 39b, 40b are welded when the power is supplied to the industrial machine with the circuit 40 closed.
- the actuator 3 moves backward, and the movable member 37 is pushed by the operating rod 21, whereby the welded movable terminals 39a, 40b and the fixed terminals 39b, 40b can be forcibly separated, and the safety switch Reliability can be improved.
- the force of providing two normally closed contacts is not limited to this, and may be one, three, or four or more. In order to increase the reliability of the safety switch, it is desirable to provide at least two normally closed contacts. Furthermore, since the second normally closed contact 40 is configured to be switched to a normally open contact by changing the positions of the movable terminal 40a and the fixed terminal 40b, the contact configuration of the switch unit 7 is used. It can easily be changed accordingly.
- the second normally closed contact 40 is switched to the normally open contact, a dedicated part is not required for each contact structure just by changing the positions of the movable terminal 40a and the fixed terminal 40b. Costs can be reduced, and it is possible to prevent misconfiguration of parts due to increased force and parts.
- only the second normally closed contact 40 is configured as a contact with which the contact structure can be switched.
- the present invention is not limited to this.
- the number of contacts with which the contact structure can be switched is arbitrary. It is.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006000426.3T DE112006000426B4 (de) | 2005-03-08 | 2006-03-03 | Sicherheitsschalter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-063333 | 2005-03-08 | ||
JP2005063333A JP4522291B2 (ja) | 2005-03-08 | 2005-03-08 | 安全スイッチ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006095645A1 true WO2006095645A1 (ja) | 2006-09-14 |
Family
ID=36953245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/304076 WO2006095645A1 (ja) | 2005-03-08 | 2006-03-03 | 安全スイッチ |
Country Status (4)
Country | Link |
---|---|
US (1) | US7633029B2 (ja) |
JP (1) | JP4522291B2 (ja) |
DE (1) | DE112006000426B4 (ja) |
WO (1) | WO2006095645A1 (ja) |
Cited By (1)
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---|---|---|---|---|
EP1973132A1 (en) * | 2007-03-17 | 2008-09-24 | Eja Limited | Safety Switch |
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JP4673661B2 (ja) | 2005-04-26 | 2011-04-20 | Idec株式会社 | 安全スイッチ |
DE502009000540D1 (de) * | 2008-09-25 | 2011-05-26 | Euchner Gmbh & Co Kg | Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine |
DE102008050892A1 (de) * | 2008-09-25 | 2010-04-08 | Euchner Gmbh + Co. Kg | Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine |
DE102008057223A1 (de) * | 2008-11-06 | 2010-05-20 | Euchner Gmbh + Co. Kg | Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine |
JP2010157488A (ja) | 2008-12-02 | 2010-07-15 | Idec Corp | 安全スイッチ |
US8362380B2 (en) | 2011-01-31 | 2013-01-29 | Bren-Tronics Batteries International, L.L.C. | Current isolation contactor |
US10475299B2 (en) | 2015-07-20 | 2019-11-12 | Banner Engineering Corporation | Modular indicator |
US9997031B2 (en) | 2015-07-20 | 2018-06-12 | Banner Engineering Corporation | Modular indicator |
JP6745568B2 (ja) * | 2018-01-11 | 2020-08-26 | Idec株式会社 | 安全スイッチ |
US11015370B2 (en) * | 2018-05-30 | 2021-05-25 | Rockwell Automation Technologies, Inc. | Quick-action orthogonal motion conversion mechanism with direct-acting return feature |
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Also Published As
Publication number | Publication date |
---|---|
JP2006252778A (ja) | 2006-09-21 |
DE112006000426T5 (de) | 2008-01-31 |
DE112006000426B4 (de) | 2023-08-24 |
US7633029B2 (en) | 2009-12-15 |
US20080121499A1 (en) | 2008-05-29 |
JP4522291B2 (ja) | 2010-08-11 |
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