JP4666159B2 - Mobile rack safety device - Google Patents

Description

  The present invention relates to a safety device for ensuring the safety of an operator in an open inter-shelf passage in a movable rack.

  The mobile rack is configured to selectively open a plurality of inter-shelf passages by lateral movement of the mobile shelf. When an operator enters one open inter-shelf passage, the mobile rack is driven. An interlock is applied to the apparatus, and other closed inter-shelf passages cannot be opened (open open inter-shelf passages cannot be closed) unless the interlock is released.

  Thus, in a general mobile rack, the interlock works automatically when a sensor detects an operator's entry into an open inter-shelf passage, and the interlock is, for example, an open inter-shelf passage. It is configured to be released by operating the interlock release switch on the operation panel beside the entrance / exit, but in this configuration, while the worker is standing at a position detected by the sensor (the sensor is Only when the interlock release switch is operated, the interlock cannot be released only when the operator is in the detection state. Thus, the interlock can be released. Therefore, in the conventional configuration, when the interlock release switch is operated, an operator who wants to release the interlock, that is, an operator who wants to open another closed inter-shelf passage, It is essential to confirm safety, such as whether there are no workers or items left behind, and if this safety check is neglected and the interlock release switch is operated, other closed shelves In order to open the inter-passage, the movable shelf can be moved laterally (the open inter-shelf passage is closed), which is a serious problem in terms of ensuring safety.

Therefore, as described in Patent Document 1 and Patent Document 2, a member for blocking the light beam of the photoelectric switch used as the worker entry detection sensor (to enter the worker detection state) is attached to the sensor and opened. A safety device configured to return the member from the light blocking position to the retracted position when the worker entering the path between the shelves sets the member at the light blocking position and the worker exits the path between the shelves is considered. It was.
JP 2002-45242 A JP 2003-246419 A

  According to the configurations described in Patent Document 1 and Patent Document 2 described above, while the worker is in the inter-shelf passage, the worker entry detection sensor is continuously in the worker entry detection state. Even if the interlock release switch is operated, the interlock is not released and the safety is improved. However, if an operator who wants to open another closed inter-shelf passage performs an operation of returning the member from the light blocking position to the retracted position without confirming safety in the open inter-shelf passage, the interlock The problem that the release operation becomes possible remains and sufficient safety cannot be ensured.

An object of the present invention is to provide a safety device for a mobile rack capable of solving the above-described conventional problems, and the means thereof is shown with reference numerals of embodiments described later. movable shelf 2A, a mobile racks to open a plurality of shelves between passages 4A-4C alternatively by traverses of 2B, each shelf between passages 4A-4C, extraction portable removable by the operator A mounting portion (reflecting plate mounting portion 9 or the like) on which a member (reflecting plate 8 or the like) is set is provided, and a detachable member (reflecting plate 8 or the like) is provided from the mounting portion (reflecting plate mounting portion 9 or the like) of the opened inter-shelf passage 4A. In the movable rack safety device configured to disable the driving of the movable shelves 2A and 2B when the removable shelf is removed, the detachable member is attached to one of the shelves forming the inter-shelf passages 4A to 4C. Reflection that can be freely attached to and detached from the provided mounting portion 9 The other shelf that forms the inter-shelf passages 4A to 4C is provided with a light projecting / receiving device 7 that constitutes the reflection type photoelectric sensors 6A to 6C together with the reflection plate 8, and in the open inter-shelf passage 4A When the reflection plate 8 is detached from the mounting portion 9, the movable shelves 2A and 2B cannot be driven.

  In addition, when the operator enters the open passage between shelves, the movable shelf drive device is interlocked and the movable shelf cannot be driven, and the interlock is released by operating the interlock release switch on the open shelf passage. When the conventional interlock system that enables the movable shelf to be driven is used in combination, the detachable member (reflector 8 or the like) is removed from the installed part (reflector attaching part 9 or the like) of the opened inter-shelf passage. When the interlock release switch is operated, the interlock is not released and the movable shelf cannot be driven. In addition, when a detachable member (reflector 8 or the like) is set in a mounting part (reflector attaching part 9 or the like) of an open shelf path, the interlock is immediately released as when the interlock release switch is operated. It may be possible to drive the movable shelf, or after setting the detachable member (reflector 8 or the like), the interlock is not released unless the interlock release switch is operated as in the conventional case. Also good. Of course, the present invention can be carried out independently without being used together with the above-described conventional interlock system. In this case, while the detachable member (reflecting plate 8 or the like) is removed from the mounting portion (reflecting plate mounting portion 9 or the like) of the opened inter-shelf passage, the moving shelf driving device is interlocked and the moving shelf Driving becomes impossible, and if a detachable member (reflector plate 8 or the like) is set on the mounting part (reflector plate mounting part 9 or the like), the interlock is released and the movable shelf can be driven.

In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the reflector 8 constituting the detachable member includes a substrate 10 that can be pulled upward with respect to the mounting portion 9, and the substrate. 10 includes a reflector main body 11 attached to the substrate 10 and a handle 12 provided on the substrate 10, and the mounting portion 9 has a pair of guide rail portions 19a for holding the left and right sides of the substrate 10 so as to be movable up and down. , 19b, and the reflecting surface 15a of the reflecting plate body 11 is exposed between the pair of guide rail portions 19a, 19b.

Further, as described in claim 3 , each of the inter-shelf passages 4A to 4C includes a light projector provided on one shelf forming the inter-shelf passage and a light receiving provided on the other shelf forming the inter-shelf passage. A transmissive photoelectric sensor comprising a light emitting device 24, and at least one of the light projecting device and the light receiving device 24 of the transmissive photoelectric sensor includes an action position crossing the optical axis between the light projecting and receiving devices and the optical axis. A light blocking member 25 that can move between a retracted position and a removable position is provided, and the detachable member includes a stopper 26 that holds the light blocking member 25 in the retracted position when the mounting member 32 is set. The light blocking member 25 is configured to switch to the operating position when the stopper 26 is removed from the mounting portion 32, and the stopper 26 is removed from the transmission photoelectric sensor in the open inter-shelf passage 4A. The state may be configured to disable the driving of the movable rack 2A, 2B. In this case, as described in claim 4 , the light blocking member 25 is supported so as to be movable up and down between the operating position and the retracted position above it, and the stopper 26 constituting the detachable member is at the retracted position. The mounting portion 32 that supports the stopper 26 can be inserted into and removed from the mounting portion 32 that supports the stopper 26 at a position for receiving the raised light blocking member 25. Further, as described in claim 5 , the stopper 26 constituting the detachable member is a vertical plate member provided with an opening 26 b that secures a light beam path between the light projector and the light receiver when set on the mounting portion 32. Can be configured.

Note that a sensor 37 for detecting the presence or absence of the detachable member (plug 33) is provided in the mounting portion (tubular mounting portion 34) of the detachable member (plug 33), and the mounting portion (cylinder in the open inter-shelf passage 4A). If the sensor 37 of the shape mounting portion 34) is not detecting the detachable member (plug 33), if the movable shelves 2A and 2B are configured not to be driven , the light beam crosses the path between the shelves. The present invention can be easily and easily implemented without using such a photoelectric sensor.

Furthermore, an attachment / detachment member (such as a plug 33) set in an attachment portion (such as a tubular attachment portion 34) is provided on either the attachment / detachment member (such as a plug 33) or an attachment portion (such as a tubular attachment portion 34). If the elastic holding means 36 that holds in a predetermined position is additionally provided, the state in which the detachable member is set on the mounting portion can be reliably held without performing a special locking operation. The possibility that the movable shelf cannot be driven or the detachable member is lost is reduced. Moreover, no special operation is required when removing the detachable member to disable the movement of the movable shelf, and the detachable member can be simply pulled out with a force greater than the holding force of the elastic holding means. Absent.

  According to the safety device for a mobile rack according to the present invention having the above-described configuration, when the detachable member is removed from the attachment portion of the opened shelf-to-shelf passage, the mobile shelf cannot be driven, so the mobile shelf is opened. The worker who enters the passage between shelves removes the detachable member from the mounting portion of the passage between the shelves and carries it, so that the detachable member carried when the worker leaves the passage between the shelves is originally attached. There is no fear that other workers will drive the moving shelf to open the other inter-shelf passage until it is returned to the section, and safety for work in the open inter-shelf passage is completely secured. Is done. In other words, since it is possible to determine when to return the movable shelf to a state where it can be driven, that is, when to release the interlock, only at the will of the operator carrying the detachable member, at the will of others regardless of whether or not safety confirmation is performed. The possibility of releasing the interlock is completely eliminated and the safety is greatly improved.

Furthermore , according to the structure of this invention , in order to comprise the conventional interlock system, the reflecting plate of the reflection type photoelectric sensor for an operator approach detection attached to each entrance / exit of each shelf of a movable rack is comprised detachably. The present invention can be implemented simply and easily. Further, when the present invention is implemented using the reflection type photoelectric sensor constituting the conventional interlock system in this way, even if the reflector (detachable member) is removed and carried, the conventional interlock system is used. Interlock and interlock release can be used, so that it is possible to ensure safety. In addition, according to the configuration of the second aspect, a reflector that is convenient for insertion / removal operation and carrying can be easily configured by using a substrate that is not related to the size or strength of the reflector main body having the reflecting surface. be able to.

Moreover, according to the structure of Claim 3 , in order to comprise the conventional interlock system, the transmissive | pervious photoelectric sensor for an operator approach detection attached to each entrance / exit of each shelf of a movement rack is utilized as it is, By adding an additional configuration thereto, the present invention can be implemented relatively easily. In this case as well, even if you forget to remove the removable member (the stopper that holds the light blocking member in the retracted position) and carry it with you, you can use the interlock and interlock release with the conventional interlock system to ensure safety for the time being. Is possible. In this case, according to the configuration of the fourth aspect , the structure is simple because the light blocking member can be lowered from the retracted position by gravity by pulling the stopper (detachable member) horizontally and switched to the working position. Thus, the present invention can be implemented at a low cost. Furthermore, according to the structure of Claim 5 , a large sized stopper (detachable member) can be comprised with a board | plate material, compared with a small pin-shaped stopper, attachment / detachment operation becomes easy, and when carrying it, There is no risk of loss.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, 1A and 1B are fixed shelves, 2A and 2B are movable shelves installed between the two fixed shelves 1A and 1B. is there. The movable shelves 2A and 2B are supported on the guide rail 3 laid on the floor surface between the two fixed shelves 1A and 1B so as to be laterally movable. As shown in the drawing, the two movable shelves 2A and 2B are connected to one fixed shelf 1B. The side shelf 4A between the other fixed shelf 1A and the movable shelf 2A is opened by laterally moving adjacent to the side, the movable shelf 2A is laterally adjacent to the fixed shelf 1A side, and the movable shelf 2B is fixed to the fixed shelf. The side shelf 4A between the two movable shelves 2A and 2B is opened by laterally adjoining the 1B side, and the two movable shelves 2A and 2B are laterally adjacent to the other fixed shelf 1A side to fix one side. The intershelf passage 4C between the shelf 1B and the movable shelf 2B is opened. In other words, the inter-shelf passages 4A to 4C are configured to be alternatively opened by the lateral movement of the movable shelves 2A and 2B.

  The mobile rack configured as described above is installed such that one end of the inter-shelf passages 4A to 4C is closed by the wall surface 5 and the other end of the inter-shelf passages 4A to 4C is an entrance / exit, and each of the inter-shelf passages 4A to 4C. Reflective photoelectric sensors 6 </ b> A to 6 </ b> C are provided on the entrance / exit side. The reflection type photoelectric sensors 6A to 6C are composed of a light projecting / receiving device 7 attached to one shelf and a reflection plate 8 attached to the other shelf among the shelves on both sides of the entrance / exit of the inter-shelf passages 4A to 4C. When one of the inter-shelf passages 4A to 4C is opened, the reflective photoelectric sensor (the reflective photoelectric sensor 6A in FIGS. 1 and 2) of the opened inter-shelf passage operates as an operator entry detector. To do.

  The reflection type photoelectric sensors 6A to 6C in this embodiment are for constituting a conventionally known interlock system. The reflection type photoelectric sensor in the opened inter-shelf passage (the reflection type photoelectric sensor in FIGS. 1 and 2). When the sensor 6A) detects the approach of the worker, that is, the light beam from the light projecting unit of the light projecting / receiving device 7 is blocked by the worker, and the light receiving unit of the light projecting / receiving device 7 receives the reflected light from the reflecting plate 8 When it is in the OFF state, the movable shelf driving device that moves the movable shelves 2A and 2B is disabled (for example, the main switch interposed in the power supply circuit is opened) and the state is self-holding circuit. It is configured to work with an interlock by holding it. In a state where the interlock is activated, the movable shelves 2A and 2B are moved laterally even if the open button corresponding to the inter-shelf passage to be opened is operated among the open buttons corresponding to the inter-shelf passages on the operation panel. The moving shelf drive does not work. To release the interlock, as is well known in the conventional interlock system, among the interlock release switches provided beside the entrance / exit of the inter-shelf passages 4A to 4C, the interlock release of the open inter-shelf passage is released. This interlock release operation cancels the self-holding action of the self-holding circuit and returns the movable shelf driving device to an operable state (the main circuit interposed in the power supply circuit). Since the switch is closed), the open shelf button corresponding to the passage between shelves to be opened on the operation panel can be operated to laterally move the movable shelves 2A and 2B to open the desired inter-shelf passage.

  As shown in FIGS. 3 to 5, each reflection plate 8 of the reflection type photoelectric sensors 6 </ b> A to 6 </ b> C is configured to be detachable with respect to the mounting portion 9. That is, the reflecting plate 8 includes a vertically long substrate 10, a rectangular reflecting plate body 11 attached to the surface of the lower half of the substrate 10, and undulations attached to the surface of the upper half of the substrate 10. It consists of a free handle 12. The reflecting plate body 11 is configured by attaching a plate 15 having a predetermined reflecting surface 15 a to the surface of a thick plate 14 having an upper end attached to the substrate 10 by screws 13, and the handle 12 is attached to the substrate 10 by screws 16. The support shaft portion 12a of the handle 12 is supported between the handle support member 17 attached by the above and the substrate 10, so that it can swing up and down around the support shaft portion 12a.

  The mounting portion 9 is provided on the surface 18a on the inter-shelf passage side of the column member 18 at the end of the entrance / exit side of each shelf to which the reflecting plate 8 is attached (in FIG. 1 and FIG. 2, the fixed shelves 1A and 1B and the movable shelf 2B). A pair of left and right guide rail portions 19a and 19b for supporting the lower half of the lower half of the substrate 10 in the reflector 8 so as to be movable up and down between the support member surface 18a and the lower side of the substrate 10 are fitted. A forming plate member 21 having a horizontal step portion 19c that forms a horizontal groove portion to be joined with the column member surface 18a and a mounting plate portion 20 that extends downward from the horizontal step portion 19c. In FIG. 2, the screw 22 and the plate nut 23 are attached to the support member 18. Further, a bent piece 20a is provided on the lower side of the mounting plate portion 20 so as to be fitted into a concave groove portion 18b formed in the length direction (height direction) formed on the column member surface 18a.

  The reflecting plate 8 configured as described above is inserted along the column member surface 18a downward from above by fitting the left and right sides of the substrate 10 to the inside of the guide rail portions 19a and 19b of the molded plate member 21. By fitting the lower side of the substrate 10 to the inside of the horizontal step portion 19 c of the molded plate member 21, it can be set to the mounting portion 9 as shown in FIGS. 4 and 5. The reflecting plate 8 in the set state is in a rectangular opening in which the rectangular reflecting surface 15a (plate 15) of the reflecting plate body 11 is surrounded by the guide rail portions 19a and 19b and the horizontal step portion 19c of the molded plate member 21. The light beam from the light projecting portion of the light projecting / receiving device 7 facing the reflecting surface 15a can be reflected and received by the light receiving portion of the light projecting / receiving device 7.

  In the state shown in FIGS. 1 and 2, the worker who enters and operates the opened inter-shelf passage 4 </ b> A raises the reflector 8 provided at the entrance / exit side of the opened inter-shelf passage 4 </ b> A. The handle 12 is used to pull upward from the mounting portion 9 and carry it until the work is completed. Accordingly, the reflection type photoelectric sensor 6A in the opened inter-shelf passage 4A is in the same state as detecting an operator because there is no reflecting plate 8, and the movable shelves 2A and 2B are arranged in the same manner as described above. An interlocking state that cannot be laterally moved. This interlocked state is the same as the state where the reflective photoelectric sensor 6A in the opened inter-shelf passage 4A continuously detects an operator. Even if the interlock release button of the inter-passage 4A is operated, it is maintained without being released. When the work in the opened inter-shelf passage 4A is completed and the worker carrying the reflector 8 exits the inter-shelf passage 4A, the reflector 8 is inserted into the original mounting portion 9 and set. As a result, the reflective photoelectric sensor 6A, which has been in the same state as detecting the operator, returns to the state of receiving the reflected light from the reflection plate 8. By operating the interlock release switch of the inter-shelf passage 4A in order to open the inter-shelf passages 4B and 4C, an interlock release state in which the movable shelves 2A and 2B can be laterally moved is brought about. Therefore, by performing an operation for opening the intershelf passage 4B or 4C to be opened, both or one of the movable shelves 2A and 2B can be laterally moved to open the target intershelf passage 4B or 4C.

  In the above-described embodiment, the reflection type photoelectric sensors 6A to 6C are used as the worker entry detectors into the inter-shelf passages 4A to 4C, but a transmission type photoelectric sensor is also used as conventionally known. This transmission type photoelectric sensor is composed of a light projector attached to one shelf and a light receiver attached to the other shelf among the shelves on both sides of the entrances and exits of the inter-shelf passages 4A to 4C. When one of ˜4C is opened, it is utilized that the light receiving device is turned off so that the light is not received by the operator by blocking the light beam from the projector to the light receiving device in the transmission type photoelectric sensor in the opened inter-shelf passage. Thus, the operator's entry into the open intershelf passages 4A to 4C is detected.

  Thus, an embodiment in which the present invention is applied to a mobile rack in which the transmission type photoelectric sensor as described above is used as a worker entry detector into the inter-shelf passages 4A to 4C is shown in FIG. Referring to FIG. 7 and FIG. 7, the projector and the light receiver are the shelves on both sides of the inter-shelf passages 4 </ b> A to 4 </ b> C, similarly to the light projecting / receiving device 7 and the reflector 8 of the reflection type photoelectric sensors 6 </ b> A to 6 </ b> C. Although attached to the column members at the end portion on the entrance / exit side so as to face each other toward the inter-shelf passage side, FIGS. 6 and 7 show the configuration of one light receiver 24 side. The light receiver 24 is attached to the inside of the opening 18b provided on the surface 18a of the column member 18 at the end of the shelf on the entrance / exit side so that the light receiver 24a can receive the light beam from the other projector. On the front side of the light receiver 24, an action position that crosses the optical axis between the light projector and the light receiver, that is, an action position that closes just before the light receiving portion 24a (see FIG. 7) and a retreat position that is away from the optical axis (see FIG. 6) And a stopper 26 that holds the light blocking member 25 in the retracted position.

  The light blocking member 25 is formed of a rectangular vertical plate having handle portions 25 a and 25 b that are bent forward and protruded at both upper and lower ends, and the left and right sides of the light blocking member 25 are between the surface 18 a of the column member 18. The formed plate member 29 having a pair of left and right guide rail portions 27a and 27b that are supported in such a manner as to be movable up and down, and mounting plate portions 28a and 28b at both upper and lower ends is attached to the surface 18a of the column member 18 with the mounting plate portions 28a and 28b and screws. 30 is attached. The stopper 26 is formed of a rectangular vertical plate that has a left and right side bent and protruded forward to form a handle portion 26a, and is provided on the lower end side of one guide rail portion 27a of the molded plate member 29. It is configured such that it can be inserted horizontally between the guide rail portions 27a and 27b from the slit 31. Therefore, the mounting portion 32 of the stopper 26 is formed by the lower half portions of the guide rail portions 27a and 27b of the molded plate material 29 and the upper side of the lower mounting plate portion 28b, and is located above the stopper mounting portion 32. With the light ray blocking member 25 raised to the position, the stopper 26 is inserted into the mounting portion 32, so that the light ray blocking member 25 to be lowered by gravity is placed on the upper side of the stopper 26 via the lower handle portion 25b. The light blocking member 25 can be held at the retracted position. At this time, an opening 26 b is provided in the stopper 26 so that the stopper 26 does not block the front of the light receiving portion 24 a of the light receiver 24.

  In addition, by eliminating the upper handle portion 25a of the light blocking member 25, the upper half portions of the left and right guide rail portions 27a and 27b of the molded plate member 29 are integrated with each other, and the front side of the light blocking member 25 raised to the retracted position. You may comprise so that may be covered with the shaping | molding board | plate material 29. FIG. Further, a concave portion in which the lower side portion of the light blocking member 25 raised to the retracted position, for example, the lower handle portion 25b is fitted, is formed on the upper side of the stopper 26 set by being inserted into the mounting portion 32. The stopper 26 can also be configured not to be removed from the mounting portion 32 unless the 25 is slightly lifted.

  According to the above configuration, in the state shown in FIGS. 1 and 2, an operator who enters and operates the opened inter-shelf passage 4 </ b> A receives the light receiver provided beside the entrance / exit of the opened inter-shelf passage 4 </ b> A. 24, the stopper 26 set in the mounting portion 32 is pulled out horizontally from the mounting portion 32 and carried until the work is completed. By pulling out the stopper 26, the light blocking member 25 received at the retracted position by the stopper 26 is lowered by gravity and automatically switched to the operating position for closing the light receiving portion 24a of the light receiver 24 as shown in FIG. . Accordingly, the transmissive photoelectric sensor in the opened inter-shelf passage 4A is in a state where the worker is constantly detected because the light from the projector is blocked by the light blocking member 25 and does not reach the light receiver 24. With the described configuration, the movable shelves 2A and 2B are in an interlock state in which they cannot be laterally moved. This interlock state is a state in which the transmissive photoelectric sensor in the opened inter-shelf passage 4A continuously detects the worker, so that in the unlikely event the other worker has opened the inter-shelf passage 4A. Even if the interlock release button is operated, it is maintained without being released. Then, when the work in the opened inter-shelf passage 4A is completed and the worker carrying the stopper 26 exits the inter-shelf passage 4A, the light blocking member 25 is raised and switched to the retracted position. By inserting the stopper 26 into the original mounting portion 32 and setting it, the front of the light receiving portion 24a of the light receiving device 24 is opened by the opening 26b of the stopper 26, and the light receiving device 24 receives light from the projector. Therefore, by operating the interlock release switch of the inter-shelf passage 4A to open the other closed inter-shelf passages 4B and 4C according to the configuration described above, the movable shelves 2A and 2B are laterally moved. It becomes the interlock release state that can be made to. Accordingly, by performing an operation for opening the intershelf passage 4B or 4C to be opened, both or one of the movable shelves 2A and 2B can be laterally moved to open the target intershelf passage 4B or 4C.

  In the above embodiment, the light blocking member 25 and the stopper 26 are provided on the light receiver 24 side. However, the light blocking member 25 and the stopper 26 are provided on the light projector side, and the light beam from the light projector is emitted immediately before the light projector. Even if it is configured to be blocked by the blocking member 25, the same action as described above can be performed.

Next, although not belonging to the technical scope of the present invention described in the claims, a reference embodiment shown in FIG. 8 will be described. In this reference embodiment, a plug 33 is disposed as an attaching / detaching member beside the entrance / exit of each of the inter-shelf passages 4A to 4C. This plug 33 can be inserted into and removed from a cylindrical mounting portion 34 attached to the column member 18 on the side of the entrance / exit of each of the inter-shelf passages 4A to 4C. A head portion 35 having a handle portion 35a is provided at the outer end. In addition, provided on the inner end side is an elastic holding means 36 that is elastically engaged with the inner end of the cylindrical mounting portion 34 to prevent it from coming off when inserted into the cylindrical mounting portion 34 to the limit depth. It has been. The elastic holding means 36 is made up of a spring wire or a spring plate that can be protruded and retracted with respect to the peripheral surface of the plug 33 as shown in the drawing and is held in a protruding state by an elastic force, and can be protruded and retracted with respect to the peripheral surface of the plug 33. Any member such as a structure in which an engaging member such as a simple ball is urged in a protruding direction by a spring may be used. Further, since the elastic holding means is a means for preventing the plug 33 inserted into the cylindrical mounting portion 34 to the limit depth, the cylindrical mounting portion 34 is detachable with respect to the concave portion provided on the peripheral surface of the plug 33. It can also be provided on the side. Furthermore, the elastic holding means serving as a means for preventing the attachment / detachment member (plug 33 in this embodiment) from being removed can be applied to the reflector 8 and the stopper 26 which are the attachment / detachment members in the previous embodiment.

  The cylindrical mounting portion 34 is provided with a sensor 37 that detects the presence or absence of the plug 33 inserted into the cylindrical mounting portion 34. The sensor 37 may be any type such as a non-contact type. Here, the sensor 37 is normally opened when the switch switching operation piece 38a is operated by the plug 33 inserted into the cylindrical mounting portion 34. A limit switch 38 is used. The normally open limit switch 38 provided for each of the inter-shelf passages 4A to 4C is interposed in series with the moving shelf driving power supply circuit 40 as the interlock means 39A to 39C of the inter-shelf passages. 41A and 41B are driving devices for the movable shelves 2A and 2B, and the traveling motors 42a and 42b are connected in parallel to the power supply circuit 40 via the controllers 43a and 43b, respectively. The controllers 43a and 43b of the movable shelf driving devices 41A and 41B are controlled by a control device 44 that receives a command signal from an inter-shelf passage opening switch or the like.

  According to the above configuration, the normally open limit switches 38 of all the interlocking means 39A to 39C are closed only when the plugs 33 of all the inter-shelf passages 4A to 4C are inserted and set in the cylindrical mounting portion 34. The power supply circuit 40 is closed, and only in this state, one or both of the movable shelf driving devices 41A and 41B are operated based on a command from the control device 44 so as to open one closed inter-shelf passage. Then, one or both of the movable shelves 2A and 2B can be laterally moved to open the target one shelf path. When an operator enters an open inter-shelf passage, a plug 33 in the inter-shelf passage is pulled out of the cylindrical mounting portion 34, thereby interlocking means in the inter-shelf passage, for example, a normally open limit switch 38 of the interlock means 39A. Is opened, and the power supply circuit 40 is opened, and the interlock is acted on the movable shelf driving devices 41A and 41B. Therefore, even if an opening switch that opens another inter-shelf passage is operated and a drive signal is input from the control device 44 to the controllers 43a and 43b of the moving shelf driving devices 41A and 41B, the motors of the moving shelf driving devices 41A and 41B The moving shelves 2A and 2B do not travel due to the operation of 42a and 42b.

  An operator who has finished the work in the open inter-shelf passage inserts and sets the portable plug 33 into the original cylindrical mounting portion 34, whereby the normally open limit switch 38 in the opened state is closed again. The power supply circuit 40 is closed and the interlock is released. Therefore, as described above, the movable shelf driving devices 41A and 41B can be operated to open other closed inter-shelf passages.

  In addition, a conventionally well-known interlock system provided with an interlock release switch and a worker entry detector that detects an operator's entry into an open shelf path is adopted for each shelf path. When the present invention shown in the third embodiment is applied to a movable rack, a plug presence / absence detection sensor such as the normally open limit switch 38 is provided in a power supply circuit of the worker entry detector. When the plug presence / absence detection sensor is in the no plug detection state, it is configured to be in the same state as when the worker entry detector detects the worker, and the reflection type photoelectric sensor 6A to 6A It is also possible to operate in the same manner as in the embodiment using the transmission type photoelectric sensor using 6C or the light receiver 24.

In the embodiment using the transmission type photoelectric sensor using the reflection type photoelectric sensors 6A to 6C or the photoreceiver 24, the reflection type photoelectric sensor or the transmission type photoelectric sensor is used in the above known interlock system. Although the thing used as a person approaching detector was utilized, without using a conventionally well-known interlock system, the transmission type photoelectric sensor itself which used reflection type photoelectric sensors 6A-6C of the above-mentioned composition or photoreceiver 24, Similarly to the above-described reference embodiment, it can be provided as an interlock means. For example, an electric circuit switch corresponding to each of the reflection type photoelectric sensors 6A to 6C or the transmission type photoelectric sensor is interposed in series with the power supply circuit 40, and the light emitting and receiving unit 7 or the transmission type of each of the reflection type photoelectric sensors 6A to 6C. When the light receiver 24 of the photoelectric sensor is in the light receiving state, the corresponding electric circuit switch is closed, and when the reflecting plate 8 is pulled out from the mounting portion 9 and the light projecting / receiving device 7 is in the non-light receiving state, or the stopper 26 is When the light receiving device 24 is brought into a non-light receiving state by being pulled out of the mounting portion 32 and switched to the operating position, the above-described reference implementation can be realized by opening the corresponding circuit switch. It can act in the same way as the form.

  In addition, it can replace with the reflecting plate 8 in 1st embodiment demonstrated based on FIGS. 3-5, and can also use the reflecting plate 8 of a simple structure as shown in FIG. The reflecting plate 8 shown in FIG. 9 is formed by bending the upper side of the substrate 10 having the reflecting plate main body 11 attached to the surface side outward to form a handle portion 10a. The handle portion 10a has various uses. It is possible to attach a ring 10b that can be used. When the reflector 8 is inserted between the pair of left and right guide rail portions 19a and 19b of the reflector mounting portion 9 so that the left and right sides of the substrate 10 are dropped from above, the handle portion 10a is guided by the guide rail portions 19a and 19b. Since it protrudes further upward and forward, when removing the reflecting plate 8, the reflecting plate 8 can be pulled up and extracted from the reflecting plate mounting portion 9 by using the handle portion 10a.

It is a schematic plan view of a movable rack. It is a schematic front view of a movement rack. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st embodiment, A figure is a front view which shows the state which removed the reflecting plate of the reflection type photoelectric sensor, and B figure is the same part vertical side view. It is a front view which shows the state which set the reflecting plate of the reflective photoelectric sensor of FIG. 3 to the reflecting plate mounting part. FIG. 5 is a sectional view taken along line XX in FIG. 4. FIG. 9A is a partially longitudinal front view showing a state in which the light blocking member of the transmission photoelectric sensor is switched to the retracted position, FIG. B is the longitudinal side view, and FIG. FIG. 6A is a front view showing a state in which the light blocking member of FIG. 6 is switched to the operating position, FIG. B is a longitudinal side view of the same, and FIG. It is the block diagram explaining the partial vertical section side view and related structure of the interlock means which show reference embodiment. It is a perspective view of the reflecting plate which shows the modification of 1st embodiment, and a reflecting plate mounting part.

Explanation of symbols

1A, 1B Fixed shelves 2A, 2B Moving shelves 4A-4C Inter-shelf passages 6A-6C Reflective photoelectric sensor 7 Projector / receiver 8 Reflector 9 Reflector mounting part 10 Substrate 11 Reflector main body 12 Handle 15a Reflecting surfaces 19a, 19b Guide Rail portion 21 Molded plate material 24 Light receiving device 25 of transmission photoelectric sensor 25 Light blocking member 26 Stopper 27a, 27b Guide rail portion 29 Molded plate material 32 Stopper mounting portion 33 Plug 34 Cylindrical mounting portion 36 Retaining prevention elastic holding means 37 Plug presence / absence detection Sensor 38 Normally open limit switches 39A to 39C Interlock means 40 Moving shelf driving power supply circuits 41A, 41B Moving shelf driving device 44 Control device

Claims (5)

A plurality of shelves passages between the traverses of movable shelves a mobile rack as alternatively opened, each shelf between passages, mounting portion provided with extraction portable detachable member is set by the operator A safety device for a movable rack configured to disable driving of the movable shelf when the detachable member is removed from the mounting portion of the opened inter-shelf passage ,
The detachable member is constituted by a reflection plate that is detachable with respect to a mounting portion provided on one shelf that forms a path between shelves, and the other shelf that forms the path between shelves includes a reflective photoelectric photoelectric sensor together with the reflection plate. A safety device for a movable rack provided with a light projecting / receiving device constituting a sensor and configured to disable driving of the movable shelf when the reflecting plate in the opened path between the shelves is removed from the mounting portion . The reflector constituting the detachable member is composed of a substrate that can be pulled upward with respect to the mounting portion, a reflector main body attached to the substrate, and a handle provided on the substrate. The movement according to claim 1, further comprising a pair of guide rail portions that hold the left and right sides of the substrate so as to be movable up and down, and the reflection surface of the reflector main body is exposed between the pair of guide rail portions. Rack safety device. Each inter-shelf passage is provided with a transmissive photoelectric sensor comprising a projector provided on one shelf forming the inter-shelf passage and a light receiver provided on the other shelf forming the inter-shelf passage. At least one of the projector and receiver of the photoelectric sensor is provided with a light blocking member that is movable between an operating position that crosses the optical axis between the projector and receiver and a retracted position that is remote from the optical axis. The detachable member is configured with a stopper that holds the light blocking member in the retracted position when set in the mounting portion, and the light blocking member is in the working position when the stopper is removed from the mounting portion. The movable shelf according to claim 1 , wherein the movable shelf is configured to be switched when the stopper is removed with respect to the transmission photoelectric sensor in the open inter-shelf passage. Transfer Safety device of the rack. The light blocking member is supported to be movable up and down between an operating position and a retracted position above it, and the stopper constituting the detachable member supports the stopper at a position for receiving the light blocking member raised to the retracted position. The safety device for a movable rack according to claim 3 , wherein the safety device is configured to be freely inserted and removed in a horizontal and lateral direction with respect to a mounting portion to be mounted . 5. The mobile rack according to claim 4 , wherein the stopper constituting the detachable member is formed of a vertical plate member having an opening that secures a light beam path between the light projector and the light receiver when set on the mounting portion . Safety device.

Images