JP4257599B2 - Article conveying device - Google Patents

Description

  The present invention includes a base-side control unit that controls the operation of a lifting drive unit that drives a lifting table on which an article can be placed along a lifting path, a lifting table-side control unit provided on the lifting table, The optical communication type base-side communication means provided in a fixed state for exchanging information with the base-side control means, and the lift base for exchanging information with the lift-side control means. An optical communication type elevator platform side communication means is provided, and an article configured to control the elevator drive of the elevator platform by communication between the elevator platform side communication means and the base body side communication means The present invention relates to a transport device.

Such an article transporting device is used when an article is placed on the elevator platform and is moved up and down to a target height along the elevator path to convey the article in the vertical direction. There is an elevator position detecting means for detecting, and there is one configured to control the elevator drive means so that the elevator platform moves up and down to a target height based on detection information of the elevator position detecting means (for example, (See Patent Document 1).
And in such an article conveyance device, in order to cope with an emergency situation in which the lifting platform cannot be stopped at the target position due to a failure of the lifting position detection means, the lifting platform has been raised to the emergency stop position in the lifting path. When the detection information of this detection switch is input to the elevator platform side control means, the detection information is transmitted to the substrate side control by communication between the elevator platform side communication means and the substrate side communication means. It is conceivable that the base-side control means controls the lift drive means to stop the lift of the lift platform.

JP 2003-104514 A

  However, in order to cope with an emergency situation, the above-described configuration, that is, communication between the platform-side communication unit and the base-side communication unit is detected information detected by the detection switch that the platform has been raised to the emergency stop position. If the configuration is used to transmit the detection information detected by the detection switch to the base-side control means, the communication between the elevator base-side communication means and the base-side communication means is performed. Due to the delay in taking time, there is a disadvantage that the lifting and lowering of the lifting platform is delayed, and foreign matter has entered the communication path for communication between the lifting platform side communication means and the base side communication means. There is a possibility that the detection information of the detection switch cannot be properly transmitted to the base-side control means and the lifting / lowering of the lifting platform cannot be stopped quickly and accurately, and there is room for improvement. .

  The present invention has been made in view of the above circumstances, and its purpose is to quickly and accurately stop raising and lowering of the lifting platform as the lifting platform rises to the emergency stop position in the lifting path. The object is to provide an article conveying apparatus.

A first characteristic configuration of the article transporting apparatus according to the present invention is the traveling carriage that can place an article and that is driven up and down along a raising / lowering path along a lifting path that is guided and supported by a lifting mast standing on the traveling carriage. and the base-side control means for controlling the operation of the provided by the lifting drive means, the elevation frame side control means provided on the lifting platform, fixed to the traveling carriage for exchanging information between the base-side controller An optical communication type base side communication means provided in the state and an optical communication type lift base side communication means provided in the lift base for exchanging information between the lift base side control means are provided. In the article conveying apparatus configured to control the lifting drive of the lifting platform by communication between the lifting platform communication means and the base communication means,
A blocking means for blocking communication light from blocking communication light from reaching the base side communication means from the lift base side communication means as the lift rises to an emergency stop position in the lift path; An emergency stop means for controlling the elevating drive means to stop raising / lowering of the elevating base as the base side communication means stops receiving communication light from the elevating base side communication means , A power supply line for supplying electric power to the elevating drive means is provided, and the emergency stop means is configured to move the elevating drive means as the base side communication means does not receive communication light from the elevating base side communication means. The base-side control means for shutting off the power supply to the base, and the base-side communication means shuts off the feeder line in the middle when the base-side communication means does not receive the communication light from the lift base-side communication means. In that it is constituted by a switch means for interrupting the power supply to the unit.

  That is, when the lifting platform is raised to the emergency stop position in the lifting path, the blocking means prevents the communication light from reaching the base-side communication means from the lifting platform-side communication means. Then, the base-side communication means stops receiving communication light from the lift-side communication means, and accordingly, the emergency stop means controls the lift drive means to stop the lift of the lift base.

Then, in order to stop the lifting / lowering of the lifting platform when the lifting / lowering platform is raised to the emergency stop position of the lifting / lowering path, the fact that the lifting / lowering platform has moved up and down to the emergency stop position is transmitted from the lifting / lowering platform communication means to the base body communication means That is, the transmission of emergency stop information is performed by blocking the arrival of communication light from the elevator platform side communication means to the base body side communication means. For example, the operation of the elevator base side communication means is stopped so that the elevator base side communication means stops projecting the communication light. Compared to transmitting the fact that the elevator has moved up and down to the stop position by modulating the communication light, the emergency stop information can be transmitted in a short time, and the elevator platform is raised to the emergency stop position of the elevator path. When Stopping the lifting of the lifting platform, that is, it is possible to perform to cause an emergency stop the elevating stand in a short time.
Further, since the emergency stop information is transmitted by blocking the arrival of the communication light from the elevator platform side communication means to the substrate side communication means, the elevator platform side communication means and the substrate side communication means are combined with this transmission. In the unlikely event that a foreign object enters the communication path for communication between the two, the intrusion of the foreign object will block the arrival of communication light from the elevator platform side communication means to the base side communication means. Therefore, it is possible to reliably perform the emergency stop of the lifting platform regardless of the entry of foreign matter into the communication path.

Therefore, when the elevator goes up to the emergency stop position on the elevator path, the elevator can be stopped immediately by transmitting the emergency stop information in a short time. The emergency stop information can be transmitted reliably and accurately regardless of the intrusion of foreign matter into the communication path between the means and the base-side communication means, and the lifting platform is raised to the emergency stop position in the lifting path. As a result, the present invention has provided an article conveying apparatus capable of quickly and accurately stopping the raising and lowering of the lifting platform.
Further, as the base-side communication means does not receive the communication light from the platform-side communication means, the switch means is configured to directly cut off the power supply to the drive means. Compared with the case where information is transmitted to the control means and the power supply to the drive means is cut off by the base-side control means based on the information, no time is required for transmitting information from the base-side communication means to the base-side control means. As the lifting platform rises to the emergency stop position, the lifting of the lifting platform can be quickly stopped.

  A second feature configuration is the first feature configuration, wherein the blocking means detects a rise of the lift to the emergency stop position, and the lift base side based on detection information from the detection switch. The communication unit is configured to include a cutoff control unit that switches to a non-communication state in which communication of communication light is stopped and sets the communication cutoff state.

That is, when the lifting platform is raised to the emergency stop position in the lifting path, it is detected by the detection switch that the lifting platform has been raised to the emergency stop position, and the lifting platform side is based on the detection information from the detection switch. The communication means is switched to the non-communication state, and the communication means is switched to the communication cut-off state by stopping transmission of the communication light of the elevator platform side communication means.
In other words, the switching to the non-communication state by the elevator platform side control means is performed by, for example, blocking the power supply to the elevator platform side communication means by the elevator platform side control means based on the detection signal of the detection switch and Since the communication can be cut off using the existing configuration such as stopping the communication of the light, the configuration of the blocking unit can be simplified.

  A third feature configuration is the first feature configuration, wherein the blocking means is configured to allow the elevator base side communication means to communicate with the base body side communication means, and the elevator base side communication means is the base side communication means. A support member provided on the lifting platform in a state of supporting the lifting platform side communication means and being biased toward the communication posture side so that the posture can be changed to a non-communication posture incapable of communication with A contact member that comes into contact with the support member when the lift is raised to the emergency stop position, and the contact member is moved to the emergency stop position as the lift comes to the emergency stop position. The communication member is configured to be in the communication cut-off state by switching to the non-communication posture by contacting the support member.

  That is, when the lifting platform is raised to the emergency stop position in the lifting path, the posture of the support member is switched to the non-communication posture against the urging to the communication posture side by the contact of the contact member with the support member. In response to the switching of the support member to the non-communication posture, the posture of the elevator base side communication means supported by the support member is also switched, and the destination of the communication light transmitted by the elevator base side communication means is the base side. Since it is switched from the communication means to the communication cut-off state, and is switched to the communication cut-off state without using the communication information using the elevator platform-side control means or the elevator platform-side communication means, Even if the device or the platform communication means breaks down, it can be switched to the communication cut-off state, and the elevation of the platform can be accurately stopped at the emergency stop position.

  According to a fourth feature configuration, in the first feature configuration, the blocking unit is retracted from a blocking posture and a communication path positioned in a communication path for performing communication between the elevator platform side communication unit and the base body side communication unit. A blocking member provided on the lifting platform in a state in which the posture can be changed to the retracted posture and biased toward the communication posture, and the blocking member is brought into contact with the blocking member by raising the lifting platform to the emergency stop position. A contact member that contacts, and the communication member cuts off when the contact member contacts the blocking member and the blocking member is switched to the blocking posture as the lifting platform rises to the emergency stop position. The point is that it is configured to be in a state.

  That is, when the lifting platform is raised to the emergency stop position in the lifting path, the position of the blocking member is switched to the blocking position against the biasing force toward the retracted position side by the contact of the contact member with the blocking member. By switching the blocking member to the blocking posture, the blocking member is positioned in the communication path of the communication light, and the communication light from the elevator platform side communication means to the base side communication means is blocked on the way by the blocking member. As in the third feature configuration, the communication is switched to the communication cut-off state without using the communication information using the elevator platform-side control means or the elevator platform-side communication means. The raising and lowering of the lifting platform can be accurately stopped at the emergency stop position.

  To switch to the communication cut-off state, it is only necessary to switch the posture of the blocking member, and it is not necessary to switch the posture of the elevator platform side communication means, and the connection between the elevator platform side control means and the elevator platform side communication means can be easily performed. Thus, the configuration can be simplified.

  The example which applied the stacker crane as an article conveyance device concerning the present invention to article storage equipment is explained based on a drawing.

[First embodiment]
As shown in FIG. 1, the article storage facility automatically includes two storage shelves 1 that are installed at an interval so that the direction of putting in and out the articles is opposed to each other, and a travel route 2 that is formed between the storage shelves 1. A traveling stacker crane 3 is provided, and each storage shelf 1 is configured by arranging a plurality of article storage units 4 in a vertical and horizontal direction.

  A travel rail 5 is installed in the travel path 2 along the longitudinal direction of the storage shelf 1. On one end side of the travel path 2, a ground-side controller 7 that inputs a loading / unloading command to the stacker crane 3, and a travel rail A pair of loading platforms 8 are provided with 5 interposed therebetween.

As shown in FIGS. 1 and 2, the stacker crane 3 includes a traveling carriage 10 that can travel along a traveling rail 5 and a lifting platform 12 that includes a fork device 11. The lifting platform 12 is guided and supported by a pair of front and rear lifting masts 13 erected on the traveling carriage 10 so as to be movable up and down, and is provided so as to be movable up and down with respect to the traveling carriage 10. Further, the fork device 11 performs a projecting operation or a retreating operation in a state where the pallet P on which the article 9 is placed is placed, so that the article 9 is placed between the loading table 8 or the article storage unit 4 and the lifting platform 12. Can be transferred.
The upper and lower ends of the pair of front and rear masts 13 are connected by an upper frame 15 that is guided along the guide rail 6.

  The stacker crane 3 then moves the article 9 placed on the loading table 8 together with the pallet P on which the article 9 is placed by the traveling of the traveling carriage 10, the raising and lowering of the lifting platform 12, and the retracting operation of the fork device 11. It is configured to perform a warehousing operation for transferring to the storage section 4 and a warehousing operation for transferring the article 9 stored in the article storage section 4 to the loading table 8 together with the pallet P on which the article 9 is placed.

The lifting platform 12 is suspended and supported at one end side of two lifting chains 14 connected to both ends in the longitudinal direction, and the lifting chain 14 is connected to the front end portion and the rear end portion of the upper frame 15. Is wound around an upper driven sprocket 16 provided on the upper side, a traveling carriage side driven sprocket 17 provided on one end and a center of the traveling carriage 10, and a drive sprocket 19 provided on one end of the traveling carriage 10. The other end side is connected to the lower part of the lifting platform 12.
The traveling carriage 10 is provided with elevating drive means 20 that drives and rotates the drive sprocket 19 to drive the elevating platform 12 along the elevating path and stop the elevating movement. As shown in FIG. 5, the elevating drive means 20 includes an inverter type elevating electric motor 20 a that elevates the elevating platform 12 along the elevating path, and a negative brake that brakes the elevating of the elevating platform 12. And the brake mechanism 20b. The drive sprocket 19 is rotated in the forward and reverse directions by the lift electric motor 20a, so that the lift chain 14 is moved in the longitudinal direction to move the lift platform 12 The elevator 12 is configured to stop at the target height by raising and lowering to the target height and braking the rotation of the drive sprocket 19 by the brake mechanism 20b.

  As shown in FIG. 3, the lifting platform 12 is provided with a lifting platform-side rotary encoder 21 that detects the lifting position on the lifting path. The elevator base-side rotary encoder 21 is provided with a sprocket 21 a meshing with a chain 13 a laid in the vertical direction of the elevator mast 13 on the rotating shaft of the elevator base-side rotary encoder 21. Is rotated, and the lift position is detected by detecting the lift distance of the lift base 12 from the reference position set at the lower end of the lift path.

The traveling carriage 10 is provided with two front and rear traveling wheels 23 that can travel on the traveling rail 5, and one of the two traveling wheels 23 on one end side in the longitudinal direction of the vehicle body is an inverter-type traveling electric motor. The driving wheel 23a for propulsion driven by the motor 24 is configured, and the wheel on the other end side in the longitudinal direction of the vehicle body is configured as a rotatable driven traveling wheel 23b.
Further, as shown in FIG. 3, the vehicle body side rotary encoder 22 that detects the travel position on the travel route 2 is provided in the travel cart 10. In the vehicle body-side rotary encoder 22, a sprocket 22 a that meshes with a chain 5 a laid along the traveling rail 5 is attached to the rotating shaft of the vehicle body-side rotary encoder 22, and the sprocket 22 a is rotated by the traveling of the traveling carriage 10. Thus, the travel position is detected by detecting the travel distance of the travel carriage 10 from the reference position set at one end of the travel route 2.

As shown in FIGS. 2 and 4, the lifting platform 12 is provided with an upper limit detection limit switch (corresponding to a detection switch) 33 that detects that the lifting platform 12 has moved up to the emergency stop position in the lifting path. Yes. The upper limit detection limit switch 33 detects the presence of the contact piece 34 by detecting the contact piece 34 provided on the elevating mast 13 to indicate that the elevating platform 12 has been raised to the emergency stop position. Configured to detect.
In addition, as shown in FIG. 5, the lifting platform 12 has a protrusion detection limit switch 31 that detects that the fork device 11 has been protruded to the protruding position, and the fork device 11 has been retracted to the retracted position. A retreat detection limit switch 32 is provided.

Next, the control configuration of the article storage facility will be described.
As shown in FIG. 5, a lower control device (corresponding to a base-side control means) 25 that is provided in the traveling carriage 10 and controls the operation of the lifting drive means 20 and the traveling electric motor 24, and the lifting platform 12. Optical communication provided in a fixed state on the traveling carriage 10 that exchanges information between the upper control device (corresponding to the elevator platform side control means) 26 that controls the operation of the exit / retreat motor 11a and the lower control device 25. Optical lower optical transmission device (base-side communication means) 27 and optical communication type upper optical transmission device (lifting platform side) provided in a fixed state on the lifting platform 12 that exchanges information between the upper control device 26 Communication means) 28.
In addition, a moving-side optical transmission device 30 provided in the traveling carriage 10 that exchanges information with the lower control device 25, and a ground-side optical transmission device 29 that exchanges information with the ground-side controller 7; Is provided.

  That is, information is exchanged between the ground-side controller 7 and the lower control device 25 by communication between the ground-side optical transmission device 29 and the mobile-side optical transmission device 30, and the lower optical transmission device 27 and the upper optical transmission device. 28 is configured to exchange information between the lower control device 25 and the upper control device 26 by communication with the control device 28. The lower optical transmission device 27 and the upper optical transmission device 28 are in the ON state when the intensity of the received communication light is higher than the set value on the higher side, and between the set value on the higher side and the lower set value. In this case, it is determined to be in an off state, and in a case where it is lower than the lower set value, it is determined to be in a blocked state, that is, a state in which no communication light is received.

  The lower control device 25 detects the detection information of the elevator base side rotary encoder 21 when an entry / exit command is commanded from the ground side controller 7 by communication between the ground side optical transmission device 29 and the movement side optical transmission device 30. The lift control unit 25a that controls the drive lift 20 to lift the lift 12 to the lift target stop position that is commanded based on the lift control unit 25a. When the loading / unloading command is commanded, the vehicle-side rotary encoder 22 is controlled. Based on the detected information, the traveling transmission motor 24 is controlled to perform a traveling control for causing the traveling carriage 10 to travel to the instructed target stop position for traveling, the lower optical transmission device 27, and the upper optical transmission device 28. A transfer communication control unit 25c for performing transfer communication control for communicating transfer information for controlling the operation of the fork device 11 to the upper control device 26 by communication with the upper control device 26. And a etc..

Further, the upper control device 26 controls the operation of the retracting motor 11a of the fork device 11 by the communication between the lower optical transmission device 27 and the upper optical transmission device 28 to cause the fork device 11 to move in and out. Based on the detection information from the transfer control unit 26 a that performs transfer control for transferring the article 9 and the upper limit detection limit switch 33, the upper optical transmission device 28 is switched to a non-communication state in which communication of communication light is stopped. Thus, it is configured by a cutoff control unit (corresponding to a cutoff control means) 26b that sets the communication cutoff state.
Accordingly, the upper limit detection limit switch 33 and the cutoff control unit 26b allow the communication light from the upper optical transmission device 28 to reach the lower optical transmission device 27 as the elevator platform 12 rises to the emergency stop position in the elevation path. The blocking means 41 is configured to set the communication cut-off state that is blocked.

  The ground-side controller 7 sets one of the loading table 8 or the plurality of article storage units 4 as a transfer target location, and performs a scooping operation or a wholesale operation on the transfer target location as a loading / unloading command. Therefore, it is configured to instruct the lower control device 25 with a scooping command or a wholesale command.

Hereinafter, a structure for stopping the lifting of the lifting platform 12 when the upper limit detection limit switch 33 detects that the lifting platform 12 has moved up to the emergency stop position will be described with reference to FIG.
The traveling carriage 10 has an emergency stop means for controlling the raising / lowering driving means 20 so that the lower optical transmission device 27 stops receiving the communication light from the upper optical transmission device 28 and stops raising / lowering the elevator platform 12. 42 is provided. The emergency stop unit 42 includes a switch unit 44 that cuts off the power supply to the elevating drive unit 20 when the lower optical transmission device 27 stops receiving communication light from the upper optical transmission device 28. .
The switch means 44 includes a relay contact 44a that is provided on a power supply line for the elevating drive means 20 and energizes in a closed state and interrupts energization in an open state, and a relay 44b that can open and operate the relay contact. ing.

Therefore, on the lifting platform 12 side, as the lifting platform 12 is raised to the emergency stop position, it is detected that the upper limit detection limit switch 33 is in contact with the contact piece 34 and the lifting platform 12 is raised to the emergency stop position. Then, the detection information is input to the cutoff control unit 26b of the upper control device 26. The cutoff control unit 26b cuts off the power supply to the upper optical transmission device 28 based on the detection information from the upper limit detection limit switch 33, and stops the communication of the communication light with the upper optical transmission device 28. Switch to the state and set the communication cut off state.
On the traveling carriage 10 side, when the communication is cut off and the lower optical transmission device 27 does not receive the communication light from the upper optical transmission device 28, current is supplied from the lower optical transmission device 27 to the switch means 44. By this current supply, the switch means 44 opens the relay contact 44a by the relay 44b, and interrupts the supply of power to the elevating drive means 20. Further, when the lower optical transmission device 27 stops receiving communication light from the upper optical transmission device 28, a signal is transmitted from the lower optical transmission device 27 to the lower control device 25, and the lower control device 25 is based on this signal. The power supply to the elevating drive means 20 is cut off. Thereby, the raising / lowering of the raising / lowering stand 12 is braked by the brake mechanism 20b, and the drive of the raising / lowering electric motor 20a in the raising / lowering drive means 20 stops, and the raising / lowering of the raising / lowering stand 12 stops.

[Second Embodiment]
In the second embodiment, the blocking means includes a support member and a contact member, and this point will be mainly described with reference to the drawings. Since other configurations are the same as those in the first embodiment, detailed description thereof will be omitted by using the same reference numerals.

  As shown in FIG. 7, the blocking means 41 has a communication posture in which the upper optical transmission device 28 can communicate with the lower optical transmission device 27 (see FIG. 7A) and the upper optical transmission device 28 A state in which the upper optical transmission device 28 is supported and urged to the communication posture side so that the posture can be changed to a non-communication posture incapable of communication with the lower optical transmission device 27 (see FIG. 7B). And a contact member 47 that comes into contact with the support member 46 when the lift 12 rises to the emergency stop position, and the lift 12 reaches the emergency stop position. The contact member 47 is brought into contact with the support member 46 as it rises, and the support member 46 is switched to the non-communication posture to be in the communication cut-off state.

As shown in FIG. 7, the support member 46 includes a fixed portion 48 that is fixedly supported on the side portion of the lifting platform 12, and an upper portion that is swingably connected to the fixed portion 48. And a support portion 49 that supports the upper optical transmission device 28 in a fixed state. The support portion 49 is urged toward the communication posture by a coil spring 50. The support member 49 is restricted from swinging by the stopper member 51 so as not to swing from the communication posture to the side opposite to the non-communication posture side.
Further, the contact member 47 is fixed to a position corresponding to the support portion 46 of the lifting platform 12 located at the emergency stop position in the lifting mast 13, and the support portion 49 as the lifting platform 12 rises to the emergency stop position. It is provided so that it may touch the top part.

  Accordingly, as the lifting platform 12 moves up to the emergency stop position, the contact member 47 contacts the support portion 49 of the support member 46 and swings the support portion 49 to move the support member 46 from the communication posture to the non-communication posture. By switching to, the communication path of communication from the upper optical transmission device 28 to the lower optical transmission device 27 is shifted, so that the communication light does not reach the lower optical transmission device 27 and the communication is cut off. Yes.

[Third Embodiment]
In the third embodiment, the blocking means includes a blocking member and a contact member, and this point will be mainly described with reference to the drawings. Since other configurations are the same as those in the first embodiment and the second embodiment, detailed description thereof will be omitted by using the same reference numerals.

  As shown in FIG. 8, the blocking means 41 is positioned in a communication path for communication between the upper optical transmission device 28 and the lower optical transmission device 27 (see FIG. 8 (B)) and the A blocking member 53 provided on the elevator 12 in a state in which the attitude can be changed to a retracted attitude (see FIG. 8C) retreating from the communication path and biased toward the retracted attitude, and the elevator 12 is provided with an abutting member 47 that comes into contact with the blocking member 53 when the elevating platform 12 is raised to the emergency stop position. The communication is cut off by contacting the member 53 and switching the blocking member 53 to the blocking posture.

As shown in FIG. 8, the blocking member 53 includes a fixed portion 48 that is supported in a fixed state on the side of the lifting platform 12, and a blocking portion that supports the upper portion in a swingable manner with respect to the fixed portion 48. 56, and the blocking portion 56 is biased toward the retracted posture by the coil spring 50. The swinging of the blocking portion 56 is restricted by the stopper member 51 so as not to swing from the retracted posture to the side opposite to the blocking posture.
Further, the contact member 47 is fixed to a position corresponding to the support portion 46 of the lifting platform 12 located at the emergency stop position in the lifting mast 13, and the blocking portion 56 as the lifting platform 12 rises to the emergency stop position. It is provided so that it may touch the top part.

  Accordingly, as the lifting platform 12 is raised to the emergency stop position, the contact member 47 contacts the blocking portion 47 of the blocking member 53 and swings the blocking portion 56, so that the blocking member 53 is changed from the retracted posture to the blocked posture. By switching, communication from the upper optical transmission device 28 to the lower optical transmission device 27 is interrupted in the middle of the communication path, so that communication light does not reach the lower optical transmission device 27 and the communication is cut off. It is configured.

[Another embodiment]
Above Symbol second embodiment, was posture change to a non-communication position the supporting portion 49 from the communication position to the support member 46 is swung by Setto the contact member 47, contact between the contact member 47 Accordingly, the support member 49 may be slid to change the posture of the support member 46 from the communication posture to the non-communication posture.
In the third embodiment, the blocking portion 56 is swung by contact with the contact member 47 to change the position of the blocking member 53 from the retracted position to the blocking position. Accordingly, the blocking unit 56 may be slid to change the position of the blocking member 53 from the retracted position to the blocking position.

Schematic diagram of goods storage facility Side view of stacker crane Bottom side view of stacker crane Top side view of stacker crane Control block diagram of goods storage facility The figure which shows the interruption | blocking means and emergency stop means of a stacker crane Action diagram of blocking means in the second embodiment Action diagram of blocking means in the third embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Elevating stand 20 Elevating drive means 25 Base | substrate side control means 26 Elevating / lowering base side control means 26b Blocking control means 27 Base | substrate side communication means 28 Elevating base side communication means 33 Detection switch 41 Blocking means 42 Emergency stop means 44 Switch means 46 Support member 47 Contact member 53 Blocking member

Claims (4)

Substrate-side control for controlling the operation of the lifting drive means provided on the traveling carriage, on which an article can be placed and which is driven up and down along the lifting path by a lifting mast that is guided and supported by a lifting mast standing on the traveling carriage Means,
A platform control means provided on the platform;
An optical communication type base side communication means provided in a fixed state on the traveling carriage for exchanging information with the base side control means;
An optical communication type elevator platform side communication means provided in the elevator platform for exchanging information with the elevator platform side control means;
An article conveying apparatus configured to control the lifting drive of the lifting platform by communication between the lifting platform communication means and the base communication means,
A blocking means for blocking communication light from blocking communication light from reaching the base side communication means from the lift base side communication means as the lift rises to an emergency stop position in the lift path;
An emergency stop means for controlling the elevating drive means to stop raising / lowering of the elevating base as the base side communication means stops receiving communication light from the elevating base side communication means ,
A power supply line for supplying power to the elevating drive means is provided,
The emergency stop means, the base side control means for cutting off power supply to the lift driving means when the base side communication means no longer receives communication light from the lift base side communication means; Article conveying means comprising: a switching means for interrupting the power supply to the elevating drive means by interrupting the power supply line when the means no longer receives communication light from the elevating side communication means apparatus. The blocking means is
A detection switch for detecting that the elevator is raised to the emergency stop position;
And a blocking control unit configured to switch to a non-communication state in which the communication of the light for communication on the elevator platform is stopped based on detection information from the detection switch and to set the communication blocking state. Item conveying apparatus of 1. The blocking means is
The posture can be changed to a communication posture in which the elevator base side communication means can communicate with the base body side communication means and a non-communication posture in which the elevator base side communication means cannot communicate with the base body side communication means. A supporting member provided on the lifting platform in a state of supporting the lifting platform side communication means and being biased toward the communication posture side;
An abutting member that abuts the support member by raising the elevator to the emergency stop position;
The contact member is brought into contact with the support member and the support member is switched to the non-communication posture as the elevator base moves up to the emergency stop position, so that the communication cut-off state is established. The article conveying apparatus according to claim 1. The blocking means is
The posture can be changed to a blocking posture positioned on a communication path for performing communication between the elevator platform side communication means and the base body side communication means and a retracted posture retracted from the communication path, and biased toward the communication posture side. A blocking member provided on the lifting platform in a state of being,
An abutting member that comes into contact with the blocking member by raising the elevator to the emergency stop position;
As the elevator goes up to the emergency stop position, the contact member comes into contact with the blocking member, and the blocking member is switched to the blocking posture so that the communication blocking state is established. The article conveying apparatus according to claim 1.

Images