WO2021260976A1 - Pallet transport system, and pallet - Google Patents

Pallet transport system, and pallet Download PDF

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Publication number
WO2021260976A1
WO2021260976A1 PCT/JP2020/047555 JP2020047555W WO2021260976A1 WO 2021260976 A1 WO2021260976 A1 WO 2021260976A1 JP 2020047555 W JP2020047555 W JP 2020047555W WO 2021260976 A1 WO2021260976 A1 WO 2021260976A1
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WO
WIPO (PCT)
Prior art keywords
pallet
contact
wheel
stopper
wheels
Prior art date
Application number
PCT/JP2020/047555
Other languages
French (fr)
Japanese (ja)
Inventor
進一 友山
顕寛 戸田
嘉孝 久保
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202080102264.1A priority Critical patent/CN115916671A/en
Priority to JP2022532253A priority patent/JPWO2021260976A1/ja
Publication of WO2021260976A1 publication Critical patent/WO2021260976A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D19/38—Details or accessories
    • B65D19/40—Elements for spacing platforms from supporting surface
    • B65D19/42—Arrangements or applications of rollers or wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G35/00—Mechanical conveyors not otherwise provided for
    • B65G35/08—Mechanical conveyors not otherwise provided for comprising trains of unconnected load-carriers, e.g. belt sections, movable in a path, e.g. a closed path, adapted to contact each other and to be propelled by means arranged to engage each load-carrier in turn
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
    • B65G47/88—Separating or stopping elements, e.g. fingers

Definitions

  • the present invention relates to a pallet transfer system and a pallet.
  • a pallet transport system having a pallet having a pallet body on which a pallet can be placed and a conveyor having a transport surface for transporting the pallet is known.
  • a pallet transport system for example, in Patent Document 1, a conveyor, a plurality of carriages for mounting a work mounted on the conveyor and movable together with the conveyor, and a moving path of the carriages are in the middle.
  • a conveyor comprising a stopper for stopping the carriage and a wheel lock mechanism for locking or unlocking the wheels of the carriage.
  • the wheel lock mechanism normally locks the wheels on the conveyor so as not to rotate, while releasing the lock in response to the bogie stop operation of the stopper.
  • the wheel lock mechanism has a lock gear coaxially fixed to the wheel, and a swing member having a lock pin that can be engaged with and detached from the gear and is swingably supported by the carriage. ..
  • the rocking member engages the lock pin with the locking gear by the urging of the spring, and swings by contacting the stopper to disengage the lock pin from the locking gear.
  • the wheels of the bogie are unlocked, so that the bogie moves on the conveyor in a direction away from the stopper.
  • the wheels of the dolly are locked again, so that the dolly moves with the conveyor and comes into contact with the stopper.
  • the trolley when the trolley is stopped by the stopper, the trolley first contacts the stopper until the trolley stops with respect to the stopper in a state of being in contact with the stopper.
  • the statically indeterminate time is long. Therefore, there is a problem that the time required for the work process becomes long in the device that performs the work on the work transported by the carriage of the transfer device.
  • a pallet transfer system that can shorten the work process time as much as possible is desired.
  • a pallet transport system capable of shortening the statically indeterminate time from when the pallet comes into contact with the stopper until the pallet stops in contact with the stopper.
  • An object of the present invention is to provide a pallet transfer system capable of shortening the statically indeterminating time of the pallet when the pallet is stopped by the stopper.
  • a pallet having a pallet body on which a transported object can be placed, a conveyor having a transport surface for transporting the pallets, and a conveyor along the transport surface of the conveyor in a transport direction. It has a guide portion that extends and guides the pallet that is conveyed on the conveyor surface, and a stopper that stops the pallet at a predetermined position on the conveyor surface.
  • the pallet has a contact portion that comes into contact with the stopper, and a damping portion that generates a damping force in the transport direction with respect to the pallet after the contact portion comes into contact with the stopper.
  • the pallet according to the embodiment of the present invention is a pallet having a pallet body on which a conveyed object can be placed and is conveyed on a conveyor surface.
  • This pallet is located at the lower part of the pallet body and has a wheel that can rotate about an axle and a wheel lock mechanism that locks or unlocks the rotation of the wheel.
  • the wheel lock mechanism includes a support shaft extending in the transport direction of the pallet, a lock portion fixed to the support shaft and stopping the rotation of the wheel by contacting the wheel, and the support shaft and the lock portion.
  • the lock portion has an urging portion for urging the first position where the lock portion comes into contact with the wheel.
  • the support shaft projects from the pallet body in the transport direction.
  • the statically indeterminating time of the pallet can be shortened.
  • FIG. 1 is a diagram showing a schematic configuration of a pallet transfer system according to the first embodiment of the present invention.
  • FIG. 2 is a plan view showing a schematic configuration of a pallet.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • FIG. 4 is a diagram schematically showing a state in which the pallet moves together with the conveyor.
  • FIG. 5 is a diagram schematically showing a state in which the pallet is in contact with the stopper.
  • FIG. 6 is a plan view showing the relationship between the transport path and the pallet.
  • FIG. 7 is a diagram schematically showing an example of a statically indeterminate time in a pallet transfer system having the configuration of the present embodiment.
  • FIG. 8 is a diagram schematically showing the statically indeterminate time when there is no gap between the pallet and the pair of guide portions.
  • FIG. 9 is a plan view showing a schematic configuration of a pallet when the left and right support shafts have different forward protrusion lengths.
  • FIG. 10 is a plan view schematically showing a state in which the pallet conveyed by the conveyor is in contact with the stopper.
  • FIG. 11 is a diagram showing a schematic configuration of a pallet of the pallet transfer system according to the second embodiment.
  • FIG. 12 is a diagram schematically showing a state in which the pallet is in contact with the stopper.
  • FIG. 13 is a diagram schematically showing a state in which the pallet moves in the direction opposite to the transport direction with respect to the stopper after the pallet comes into contact with the stopper.
  • the transport direction of the pallet 2 is referred to as "forward direction”, and the direction opposite to the transport direction of the pallet 2 is referred to as "rear direction”. Further, when viewed from the conveyed object M on the pallet 2, the left with respect to the conveyed direction is referred to as “left direction”, and the right with respect to the conveyed direction is referred to as "right direction”.
  • FIG. 1 is a diagram showing a schematic configuration of a pallet transfer system 1 according to the first embodiment of the present invention.
  • the pallet transfer system 1 is a system that conveys the pallet 2 on which the conveyed object M is placed by the conveyor 3.
  • the pallet transfer system 1 is used, for example, as an inspection device for inspecting a transported object M, a processing device for processing a transported object M, and the like.
  • the pallet transfer system 1 has a plurality of pallets 2, a conveyor 3, a pair of guide portions 4, and a stopper 5.
  • the conveyor 3 can be moved in one direction by a drive mechanism (not shown).
  • the conveyor 3 is, for example, an endless band-shaped conveyor belt.
  • the upper surface of the conveyor 3 is a conveyor surface 3a that conveys a plurality of pallets 2.
  • the pair of guide portions 4 are located on both sides of the conveyor 3 in the width direction.
  • the pair of guide portions 4 are plate-shaped members extending in the moving direction of the conveyor 3.
  • a transport path R extending along the conveyor 3 is formed between the pair of guide portions 4.
  • the stopper 5 moves up and down at a predetermined position on the conveyor 3 by a drive mechanism (not shown).
  • the stopper 5 is a member for stopping the pallet 2 mounted on the conveyor 3 with respect to the conveyor 3.
  • the stopper 5 descends to a height position at which the pallet 2 can be stopped with respect to the conveyor 3, and when the movement of the pallet 2 is allowed, the stopper 5 rises to a height position that does not hinder the movement of the pallet 2.
  • the plurality of pallets 2 are located side by side on the conveyor 3 in the transport direction.
  • the plurality of pallets 2 move in the transport direction together with the conveyor 3 while being placed on the conveyor 3. Therefore, the transport direction of the pallet 2 is the moving direction of the conveyor 3, and is the direction in which the transport surface 3a of the conveyor 3 extends.
  • FIG. 2 is a plan view showing a schematic configuration of the pallet 2.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG. As shown in FIGS. 2 and 3, the pallet 2 has a pallet body 21, a plurality of wheels 22, and a wheel locking mechanism 23.
  • the pallet body 21 is a flat plate-shaped member on which the conveyed object M can be placed.
  • the pallet body 21 has a rectangular shape in a plan view.
  • the plurality of wheels 22 are rotatably supported at the lower part of the pallet body 21 around the axle P.
  • the plurality of wheels 22 are located side by side with respect to the pallet body 21. That is, the plurality of wheels 22 are arranged in the transport direction with respect to the pallet body 21.
  • the plurality of wheels 22 are located at the four corners of the pallet body 21 in a plan view.
  • the axle P is parallel to the transport surface 3a of the conveyor 3.
  • the pallet body 21 can be moved with respect to the conveyor 3 by a plurality of wheels 22.
  • the wheel lock mechanism 23 locks or unlocks the rotation of the plurality of wheels 22.
  • the wheel lock mechanism 23 is supported by the pallet body 21.
  • the wheel lock mechanism 23 may lock or unlock a plurality of wheels 22 at the same time, or may lock or unlock the plurality of wheels 22 separately.
  • the wheel lock mechanism 23 has a plurality of lock portions 26, a support shaft 27, and a spring 28.
  • the plurality of lock portions 26 are located rearward with respect to the plurality of wheels 22. Each lock portion 26 locks the rotation of each wheel 22 by coming into contact with each wheel 22.
  • the support shaft 27 connects at least a part of the lock portions 26 among the plurality of lock portions 26.
  • the support shaft 27 connects, for example, the lock portions 26 arranged in front of and behind the pallet 2.
  • the support shaft 27 is a rod-shaped member and penetrates the pallet body 21 in the front-rear direction.
  • Each of the plurality of lock portions 26 is fixed to the support shaft 27.
  • the front end portion 27a of the support shaft 27 projects forward from the front surface of the pallet body 21.
  • the front end portion 27a of the support shaft 27 is located at the frontmost position.
  • the portion of the support shaft 27 that protrudes forward from the front surface of the pallet body 21 is the protrusion 27b.
  • the front end portion 27a is located at the front end of the protrusion portion 27b. Therefore, the front end portion 27a and the protrusion portion 27b are contact portions that come into contact with the stopper 5.
  • a spring 28 is located on the outer circumference of a part of the support shaft 27 in the axial direction.
  • the spring 28 is a compression spring, and deforms in the compression direction to generate an elastic restoring force.
  • the front end of the spring 28 is fixed to the support shaft 27, while the rear end of the spring 28 is in contact with the pallet body 21.
  • the spring 28 urges the support shaft 27 forward with respect to the pallet body 21.
  • the spring 28 may be located at only one position in the axial direction of the support shaft 27, or may be located at a plurality of positions in the axial direction of the support shaft 27.
  • the lock portion 26 fixed to the support shaft 27 is pressed against the wheel 22. Therefore, in a state where no rear force is input to the support shaft 27, the wheel 22 is in a locked state in which the rotation is locked by the wheel lock mechanism 23.
  • the position of the lock portion 26 that locks the wheel 22 is the first position. That is, the first position of the lock portion 26 is the position of the lock portion 26 when no external force is applied to the support shaft 27.
  • the spring 28 functions as an urging portion that urges the lock portion 26 to the first position in contact with the wheel 22.
  • FIG. 4 is a diagram schematically showing a state in which the pallet 2 moves together with the conveyor 3.
  • FIG. 5 is a diagram schematically showing a state in which the pallet 2 is in contact with the stopper 5.
  • the pallet 2 moves in the moving direction of the conveyor 3 together with the conveyor 3, as shown by the white arrow in FIG. Therefore, the pallet 2 is conveyed in the conveying direction by the conveyor 3.
  • the moving direction of the conveyor 3 is indicated by an arrow with diagonal lines.
  • the rearward movement of the support shaft 27 causes the spring 28 to be deformed in the compression direction. Therefore, the spring 28 has an elastic restoring force that pushes the support shaft 27 forward.
  • the support shaft 27 has an elastic restoring force of the spring 28 as shown by the solid arrow in FIG. Move forward by. Then, the lock portion 26 fixed to the support shaft 27 also moves forward and comes into contact with the wheel 22. As a result, the lock portion 26 locks the wheel 22 again.
  • the pallet 2 of the present embodiment has the wheel lock mechanism 23 described above, a static time is required from the first contact of the pallet 2 with the stopper 5 until the pallet 2 is stopped at a predetermined position. This statically indeterminate time greatly affects the work time when the pallet 2 is conveyed by the pallet transfer system 1 and the work is performed on the conveyed object M by another device.
  • FIG. 6 is a plan view showing the relationship between the transport path R and the pallet 2.
  • the transport path R is a space for transporting the pallet 2 by the conveyor 3. As described above, the transport path R is composed of a transport surface 3a of the conveyor 3 and a pair of guide portions 4 located on both sides in the width direction thereof.
  • the rear portion 21a of the pallet body 21 is paired. Contact one of the guide portions 4.
  • the rear portion 21a of the pallet body 21 is a corner portion of the rear portion of the pallet body 21.
  • the rear portion 21a of the pallet body 21 that comes into contact with the pair of guide portions 4 functions as a damping portion that generates a damping force with respect to the pallet 2. ..
  • the pair of guide portions 4 are placed between the transport surface 3a and the pallet 2 located on the transport surface 3a when viewed from above. It has a predetermined gap D that allows the pallet 2 to tilt diagonally with respect to the transport direction.
  • the predetermined gap D has dimensions such that when the pallet 2 is tilted diagonally with respect to the transport direction, the rear portion 21a of the pallet body 21 comes into contact with one of the pair of guide portions 4 to generate a damping force in the transport direction. be.
  • the predetermined gap D is set to be wider than the gap for realizing friction reduction and wear suppression between the pallet 2 and the pair of guide portions 4.
  • the predetermined gap D is too large, when the pallet 2 is tilted obliquely with respect to the transport direction, the movement of the pallet 2 may be hindered or the positioning accuracy of the pallet 2 by the stopper 5 may be affected.
  • the upper limit of the predetermined gap D is such that when the pallet 2 is tilted diagonally with respect to the transport direction, the movement of the pallet 2 is not hindered or the positioning accuracy of the pallet 2 by the stopper 5 is not affected.
  • the predetermined gap D is preferably 0.3 mm or less.
  • the predetermined gap D is a gap between the pallet 2 and the guide portion 4.
  • FIG. 7 is a diagram schematically showing an example of the statically indeterminate time in the pallet transfer system 1 having the configuration of the present embodiment.
  • FIG. 8 is a diagram schematically showing the statically indeterminate time when there is no gap between the pallet 2 and the pair of guide portions 4.
  • the statically indeterminate time when the pallet 2 is stopped at a predetermined position can be shortened by the stopper 5.
  • the pallet transport system 1 includes a pallet 2 having a pallet body 21 on which a transport object M can be placed, a conveyor 3 having a transport surface 3a for transporting the pallet 2, and a conveyor 3 transport surface.
  • a guide portion 4 extending in the transport direction along 3a to guide the pallet 2 transported on the transport surface 3a of the conveyor 3, and a stopper 5 for stopping the pallet 2 at a predetermined position on the transport surface 3a.
  • the pallet 2 has a front end portion 27a of the support shaft 27 that comes into contact with the stopper 5, and a damping portion that generates a damping force in the transport direction with respect to the pallet 2 after the contact portion comes into contact with the stopper 5.
  • this damping portion is the rear portion 21a of the pallet body 21.
  • the guide portion 4 has a predetermined gap D between the pallet 2 located on the transport surface 3a and the transport surface 3a when the transport surface 3a is viewed from above, which allows the pallet 2 to be tilted diagonally with respect to the transport direction.
  • the damping portion is a rear portion 21a of the pallet 2 that comes into contact with the guide portion 4 in a state where the pallet 2 is tilted obliquely with respect to the transport direction.
  • the guide portion 4 When the transport surface 3a is viewed from above, the guide portion 4 has a predetermined gap D between the guide portion 4 and the pallet 2, so that the pallet 2 is tilted diagonally with respect to the transport direction. As a result, the rear portion 21a of the pallet body 21 comes into contact with the guide portion 4. By this contact, the force that the pallet 2 in contact with the stopper 5 rebounds in the direction opposite to the transport direction can be attenuated. Therefore, when the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
  • the presence of a predetermined gap D between the guide portion 4 and the pallet 2 causes the pallet main body 21 to come into contact with the guide portion 4 to generate a damping force. Therefore, it is possible to shorten the statically indeterminating time of the pallet 2 with a simple configuration.
  • the pallet 2 is located at the lower part of the pallet body 21, and has a wheel 22 that can rotate about an axle P parallel to the conveyor surface 3a of the conveyor 3, a wheel lock mechanism 23 that locks or unlocks the rotation of the wheel 22. Further have.
  • the wheel lock mechanism 23 causes the wheel lock mechanism 23 to unlock the rotation of the wheel 22, and the front end portion 27a of the support shaft 27 comes into contact with the stopper 5. In the non-existing state, the rotation of the wheel 22 is locked.
  • the wheel 22 located at the lower part of the pallet body 21 of the pallet 2 is held in a locked state until the front end portion 27a of the support shaft 27 comes into contact with the stopper 5. Therefore, the pallet 2 moves in the transport direction together with the transport surface 3a of the conveyor 3.
  • the wheel lock mechanism 23 unlocks the wheel 22.
  • the wheels 22 rotate with respect to the transport surface 3a of the conveyor 3, so that the pallet 2 does not move in the transport direction together with the transport surface 3a.
  • the operation of the wheel lock mechanism 23 increases the statically indeterminating time of the pallet 2 after the pallet 2 comes into contact with the stopper 5.
  • the pallet transfer system 1 having the pallet 2 operating as described above by applying each of the above configurations, when the pallet 2 is stopped at a predetermined position on the transfer surface 3a by the stopper 5, the pallet is stopped.
  • the statically indeterminate time of 2 can be shortened.
  • the wheel lock mechanism 23 has a lock portion 26 that stops the rotation of the wheel 22 by coming into contact with the wheel 22, and a spring 28 that urges the lock portion 26 to a first position in contact with the wheel 22.
  • the lock portion 26 is positioned at a second position away from the wheel 22 against the urging force of the spring 28.
  • the lock portion 26 is brought into contact with the wheel 22 by the spring 28 and the lock portion 26 is separated from the wheel 22 against the urging force of the spring 28 in a state where the front end portion 27a of the support shaft 27 is in contact with the stopper 5.
  • the spring 28 produces a large rebounding force. Therefore, in the configuration in which the lock portion 26 is urged to the first position in contact with the wheel 22 by the spring 28 in this way, the pallet 2 is stoppered 5 by applying the configuration of the present embodiment that generates a damping force in the transport direction. Therefore, the statically indeterminating time of the pallet 2 can be shortened more effectively when the pallet 2 is stopped at a predetermined position on the transport surface 3a.
  • the wheel 22 includes a plurality of wheels 22 arranged in the transport direction of the pallet 2.
  • the lock portion 26 includes a plurality of lock portions 26 that come into contact with each of the plurality of wheels 22.
  • the spring 28 urges the plurality of lock portions 26 to the first position in contact with the plurality of wheels 22.
  • the front end portion 27a of the support shaft 27 is in contact with the stopper 5, the plurality of lock portions 26 are positioned at a second position away from the wheel 22 against the urging force of the spring 28.
  • the pallet 2 has a plurality of wheels 22 arranged in the transport direction, the positions of the plurality of lock portions 26 in contact with the plurality of wheels 22 are controlled by the spring 28 and the front end portion 27a of the support shaft 27. be able to.
  • the pallet 2 is made larger by the spring 28 after being in contact with the stopper 5. Generates a rebounding force.
  • the spring 28 and the front end portion 27a of the support shaft 27 can control the locking or unlocking of the rotation of the plurality of wheels 22 arranged in the transport direction. Therefore, with a simple configuration, it is possible to control the locking or unlocking of the rotation of the plurality of wheels 22 arranged in the transport direction.
  • the contact portion of the pallet 2 that comes into contact with the stopper 5 includes a protrusion 27b that protrudes from the pallet body 21 in the transport direction.
  • the protrusion 27b protruding from the pallet 2 in the transport direction into contact with the stopper 5
  • the pallet 2 can be easily tilted diagonally with respect to the transport direction.
  • a part of the pallet 2 can be reliably brought into contact with the guide portion 4. Therefore, the force of the pallet 2 in contact with the stopper 5 rebounding in the direction opposite to the transport direction can be more reliably damped. Therefore, when the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
  • the pallet 2 of the present embodiment is a pallet having a pallet body 21 on which a conveyed object M can be placed and is conveyed on the conveyor surface 3a of the conveyor 3.
  • the pallet 2 is located below the pallet body 21 and has a wheel 22 that can rotate about the axle P and a wheel lock mechanism 23 that locks or unlocks the rotation of the wheel 22.
  • the wheel lock mechanism 23 includes a support shaft 27 extending in the transport direction of the pallet 2, a lock portion 26 fixed to the support shaft 27 and stopping the rotation of the wheel 22 by coming into contact with the wheel 22, and a support shaft 27 and a lock portion. 26 has a spring 28 that urges the lock portion 26 to a first position in contact with the wheel 22.
  • the support shaft 27 projects from the pallet body 21 in the transport direction.
  • the wheel 22 includes a plurality of wheels 22 arranged in the transport direction of the pallet 2.
  • the lock portion includes a plurality of lock portions 26 that come into contact with each of the plurality of wheels 22.
  • a plurality of lock portions 26 are fixed to the support shaft 27.
  • the spring 28 urges the plurality of locking portions 26 to the first position in contact with the plurality of wheels 22.
  • the rotation of the plurality of wheels 22 arranged in the transport direction of the pallet 2 can be locked or unlocked by moving the support shaft 27 in the transport direction. Therefore, with a simple configuration, it is possible to control the locking or unlocking of the rotation of the plurality of wheels 22.
  • the forward protrusion length of the support shaft 27 with respect to the pallet body 21 is the same on the left and right sides of the pallet 2.
  • the protruding length may be different on the left and right sides of the pallet 2.
  • FIG. 9 is a plan view showing a schematic configuration of the pallet 102 when the support shafts 27 and 127 have different forward protrusion lengths on the left and right sides.
  • FIG. 10 is a plan view schematically showing a state in which the pallet 102 conveyed by the conveyor 3 is in contact with the stopper 5.
  • reference numeral 101 is a pallet transfer system.
  • the forward protrusion length of the support shaft 127 located on the right is larger than the forward protrusion length of the support shaft 27 located on the left. Therefore, when the pallet 102 comes into contact with the stopper 5, the front end portion 127a of the support shaft 127 having a large protrusion length first comes into contact with the stopper 5.
  • reference numerals 27b and 127b are protrusions, respectively.
  • the contact portion in contact with the stopper 5 in the pallet 102 includes a plurality of protrusions protruding from the pallet body 21 in the transport direction. At least two of the plurality of protrusions 27b and 127b have different protrusion lengths in the transport direction.
  • the pallet 2 Since the protrusion lengths of at least two protrusions 27b and 127b in the transport direction are different, the pallet 2 is in contact with the guide portion 4 in a state of being tilted more obliquely with respect to the transport direction when the transport surface 3a is viewed from above. Can be made to. By this contact, the force that the pallet 2 in contact with the stopper 5 rebounds in the direction opposite to the transport direction can be attenuated.
  • the statically indeterminating time of the pallet 2 can be shortened more reliably.
  • the forward protrusion length of the support shaft located on the left may be larger than the forward protrusion length of the support shaft located on the right.
  • which of the support shafts located on the left and the support shafts on the right is to be increased in the forward protrusion length is determined in which direction the pallet 102 is obliquely transported. You can decide whether to tilt it.
  • FIG. 11 shows a schematic configuration of the pallet 202 of the pallet transfer system according to the second embodiment.
  • the pallet 202 has a plurality of wheels 222 that can rotate about a vertical axis Q extending in the vertical direction.
  • the configuration of the pallet transfer system is the same as the configuration of the pallet transfer system 1 of the first embodiment except for the configuration of the wheels 222. Therefore, in the following, the description of the same configuration as that of the first embodiment will be omitted, and only the configuration of the wheel 222 of the pallet 202 will be described.
  • the pallet 202 has a pallet body 221 and a plurality of wheels 222.
  • the pallet body 221 is, for example, a rectangular parallelepiped member.
  • the plurality of wheels 222 are four wheels 222.
  • the wheels 222 are located at the lower portions of the four corners of the pallet body 221.
  • the wheels 222 rotate around an axle P extending parallel to the transport surface 3a of the conveyor 3.
  • the wheel 222 can rotate about the vertical axis Q extending in the vertical direction with respect to the pallet main body 221. That is, when the pallet 202 is viewed in the vertical direction, the rolling direction of the wheel 222 changes according to the rotation of the wheel 222 about the vertical axis Q.
  • the rolling direction of the wheel 222 means the direction in which the wheel 222 rotates when the pallet 202 is viewed in the vertical direction.
  • FIG. 12 is a plan view showing a state in which the pallet 202 is in contact with the stopper 5.
  • FIG. 13 is a plan view showing a state in which the pallet 202 comes into contact with the stopper 5 and then moves in the direction opposite to the transport direction with respect to the stopper 5.
  • reference numeral 201 is a pallet transfer system.
  • the rolling direction of the plurality of wheels 222 is substantially the same as the transport direction until the pallet 202 having the above configuration comes into contact with the stopper 5.
  • the plurality of wheels 222 of the pallet 202 that have moved in the direction opposite to the transport direction with respect to the stopper 5 are each vertical. It rotates around the axis Q. As a result, the rolling directions of the plurality of wheels 222 are different from each other. Then, the movement of the pallet 202 in the direction away from the stopper 5 is hindered.
  • the plurality of wheels 222 having the above configuration generate a damping force in the transport direction with respect to the pallet 202, as shown by the broken line arrow in FIG. Therefore, the plurality of wheels 222 of the present embodiment function as damping portions.
  • statically indeterminating time until the pallet 202 in contact with the stopper 5 stops at a predetermined position by the stopper 5 can be shortened.
  • the damping portion includes the wheel 222 located at the lower part of the pallet body 221.
  • the wheels 222 can rotate about an axle P parallel to the conveyor surface 3a of the conveyor 3 and can rotate about a vertical axis Q extending in the vertical direction.
  • the rolling direction of the wheels 222 and the transport direction of the pallet 202 may differ.
  • the friction between the wheel 222 and the transport surface 3a creates a resistance force against the movement of the pallet 202. Therefore, since the pallet 202 has the above-mentioned wheel 222, when the pallet 202 comes into contact with the stopper 5, when it receives a force that rebounds in the direction opposite to the transport direction, the force can be damped. Therefore, when the pallet 202 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 202 can be shortened.
  • the wheel lock mechanism as in the first embodiment may be applied to the wheel 222 that rotates about the vertical axis Q as in the present embodiment.
  • the wheel 222 rotates about the vertical axis Q as described above, so that the pallet 202 is prevented from being separated from the stopper 5.
  • the pallet 202 moves in the transport direction together with the conveyor 3 as in the locked state of the wheels 22 in the first embodiment.
  • the pallet 202 further has a wheel locking mechanism that locks or unlocks the rotation of the wheels 222.
  • the wheel lock mechanism unlocks the rotation of the wheel 222 when the contact portion is in contact with the stopper 5, and locks the rotation of the wheel 222 when the contact portion is not in contact with the stopper 5. Since the wheel lock mechanism has the same configuration as the wheel lock mechanism 23 of the first embodiment, detailed description of the wheel lock mechanism will be omitted.
  • the right corner portion of the rear portion of the pallet 2 comes into contact with the guide portion 14.
  • the left corner of the rear portion of the pallet may come into contact with the guide portion.
  • the pallets 2, 102, 202 have protrusions 27b, 127b of the support shafts 27, 127 on the left and right sides of the front portion.
  • the pallet may have a protrusion of the support shaft on only one of the left and right sides of the front portion.
  • the pallet may have a protrusion of the support shaft at the center of the front portion in the left-right direction. In order to tilt the pallet with respect to the transport direction, it is preferable that the protrusions of the support shaft are located outside the center of all the pallets in the left-right direction. Further, the pallet may have three or more support shaft protrusions on the front portion.
  • the lock portion 26 for locking or unlocking the wheel 22 is fixed to the support shafts 27 and 127.
  • the pallet may have a configuration that locks or unlocks the wheels by another mechanism.
  • one lock portion may be fixed to the support shaft, or three or more lock portions may be fixed to the support shaft. That is, the number of lock portions fixed to the support shaft may be changed according to the arrangement of the wheels on the pallet.
  • the pallet transfer systems 1, 101, 201 convey a plurality of pallets 2, 102, 202, but only one pallet may be conveyed.
  • first embodiment and the second embodiment are described as different embodiments, but the configurations of the first embodiment and the second embodiment may be combined.
  • the present invention can be used for a pallet transport system that transports pallets by a conveyor.

Abstract

Provided is a pallet transport system in which it is possible to shorten the settling time of a pallet when the pallet is stopped by a stopper. This pallet transport system 1 has a pallet 2 having a pallet body 21 in which a material M being conveyed can be placed, a conveyor 3 having a transport surface 3a for transporting the pallet 2, a pair of guide parts 4 that extend in the transport direction along the transport surface 3a of the conveyor 3 and that guide the pallet 2 being transported on the transport surface 3a of the conveyor, and a stopper 5 that stops the pallet 2 at a prescribed position on the transport surface 3a. The pallet 2 has a front end section 27a of a support shaft 27 that contacts the stopper 5, and a damping part that produces a damping force in the transport direction relative to the pallet 2 after a contact section has contacted the stopper 5. In the present embodiment, the damping part is a rear section 21a of the pallet body 21.

Description

パレット搬送システム及びパレットPallet transfer system and pallets
　本発明は、パレット搬送システム及びパレットに関する。 The present invention relates to a pallet transfer system and a pallet.
　搬送物を載置可能なパレット本体を有するパレットと、前記パレットを搬送する搬送面を有するコンベアと、を有するパレット搬送システムが知られている。このようなパレット搬送システムとして、例えば、特許文献１には、コンベアと、前記コンベア上に載せられ、前記コンベアと共に移動可能であるワーク載置用の複数の台車と、前記台車の移動経路の途中で前記台車を止めるストッパと、前記台車の車輪をロックまたはロック解除する車輪ロック機構とを備えた搬送装置が開示されている。 A pallet transport system having a pallet having a pallet body on which a pallet can be placed and a conveyor having a transport surface for transporting the pallet is known. As such a pallet transport system, for example, in Patent Document 1, a conveyor, a plurality of carriages for mounting a work mounted on the conveyor and movable together with the conveyor, and a moving path of the carriages are in the middle. Discloses a conveyor comprising a stopper for stopping the carriage and a wheel lock mechanism for locking or unlocking the wheels of the carriage.
　前記特許文献１の搬送装置では、前記車輪ロック機構は、常時は前記コンベア上の車輪を回転不能にロックする一方、前記ストッパの台車停止動作に応答して前記ロックを解除する。 In the transport device of Patent Document 1, the wheel lock mechanism normally locks the wheels on the conveyor so as not to rotate, while releasing the lock in response to the bogie stop operation of the stopper.
　詳しくは、前記車輪ロック機構は、車輪と同軸に固定されたロック用歯車と、この歯車に係脱可能なロックピンを有し且つ前記台車に揺動自在に支持された揺動部材とを有する。この揺動部材は、ばねの付勢により前記ロックピンを前記ロック用歯車に係合させるとともに、前記ストッパに当接することにより揺動して前記ロックピンを前記ロック用歯車から係合解除させる。 Specifically, the wheel lock mechanism has a lock gear coaxially fixed to the wheel, and a swing member having a lock pin that can be engaged with and detached from the gear and is swingably supported by the carriage. .. The rocking member engages the lock pin with the locking gear by the urging of the spring, and swings by contacting the stopper to disengage the lock pin from the locking gear.
特開２００４－２７７０９２号公報Japanese Unexamined Patent Publication No. 2004-277092
　ところで、上述の特許文献１に開示される搬送装置の場合、常時は前記コンベア上で前記台車の車輪を回転不能にロックすることで、前記台車は、前記コンベアと共に移動する。一方、前記台車の揺動部材が前記ストッパに接触することで、前記台車の車輪のロックが解除されるため、前記台車は前記コンベアに対して移動する。 By the way, in the case of the transport device disclosed in Patent Document 1 described above, the trolley moves together with the conveyor by constantly locking the wheels of the trolley on the conveyor so as not to rotate. On the other hand, when the rocking member of the bogie comes into contact with the stopper, the wheels of the bogie are unlocked, so that the bogie moves with respect to the conveyor.
　よって、前記搬送装置において、前記台車の揺動部材が前記ストッパに接触すると、前記台車の車輪のロックが解除されるため、前記台車が前記コンベア上を前記ストッパに対して離れる方向に移動する。前記台車が前記ストッパから離れると、前記台車の車輪が再びロックされるため、前記台車は前記コンベアと共に移動して前記ストッパに接触する。 Therefore, in the transport device, when the rocking member of the bogie comes into contact with the stopper, the wheels of the bogie are unlocked, so that the bogie moves on the conveyor in a direction away from the stopper. When the dolly separates from the stopper, the wheels of the dolly are locked again, so that the dolly moves with the conveyor and comes into contact with the stopper.
　このように、前記搬送装置では、前記ストッパによって前記台車を止める際に、前記台車が前記ストッパに最初に接触してから、前記台車が前記ストッパに接触した状態で前記ストッパに対して停止するまでの静定時間が長い。そのため、前記搬送装置の台車によって搬送されるワークに対して作業を行う装置では、作業工程に必要な時間が長くなるという問題があった。 As described above, in the transport device, when the trolley is stopped by the stopper, the trolley first contacts the stopper until the trolley stops with respect to the stopper in a state of being in contact with the stopper. The statically indeterminate time is long. Therefore, there is a problem that the time required for the work process becomes long in the device that performs the work on the work transported by the carriage of the transfer device.
　これに対し、作業工程の時間をできるだけ短縮可能なパレット搬送システムが望まれている。そのためには、パレットがストッパに接触してから、前記パレットが前記ストッパに接触した状態で停止するまでの静定時間を短縮可能なパレット搬送システムが望まれている。 On the other hand, a pallet transfer system that can shorten the work process time as much as possible is desired. For that purpose, there is desired a pallet transport system capable of shortening the statically indeterminate time from when the pallet comes into contact with the stopper until the pallet stops in contact with the stopper.
　本発明の目的は、ストッパによってパレットを停止させる際に、前記パレットの静定時間を短縮可能なパレット搬送システムを提供することにある。 An object of the present invention is to provide a pallet transfer system capable of shortening the statically indeterminating time of the pallet when the pallet is stopped by the stopper.
　本発明の一実施形態に係るパレット搬送システムは、搬送物を載置可能なパレット本体を有するパレットと、前記パレットを搬送する搬送面を有するコンベアと、前記コンベアの搬送面に沿って搬送方向に延びていて、前記コンベアの搬送面上で搬送される前記パレットをガイドするガイド部と、前記パレットを前記搬送面上の所定位置で停止させるストッパと、を有する。前記パレットは、前記ストッパに接触する接触部と、前記接触部が前記ストッパに接触した後に、前記パレットに対して搬送方向に減衰力を生じる減衰部と、を有する。 In the pallet transport system according to the embodiment of the present invention, a pallet having a pallet body on which a transported object can be placed, a conveyor having a transport surface for transporting the pallets, and a conveyor along the transport surface of the conveyor in a transport direction. It has a guide portion that extends and guides the pallet that is conveyed on the conveyor surface, and a stopper that stops the pallet at a predetermined position on the conveyor surface. The pallet has a contact portion that comes into contact with the stopper, and a damping portion that generates a damping force in the transport direction with respect to the pallet after the contact portion comes into contact with the stopper.
　本発明の一実施形態に係るパレットは、搬送物を載置可能なパレット本体を有し、コンベアの搬送面上で搬送されるパレットである。このパレットは、前記パレット本体の下部に位置し、車軸を中心として回転可能な車輪と、前記車輪の回転をロック又はロック解除する車輪ロック機構と、を有する。前記車輪ロック機構は、前記パレットの搬送方向に延びる支持軸と、前記支持軸に固定され、前記車輪に接触することで前記車輪の回転を停止させるロック部と、前記支持軸及び前記ロック部を、前記ロック部が前記車輪に接触する第１位置に付勢する付勢部と、を有する。前記支持軸は、前記パレット本体から搬送方向に突出している。 The pallet according to the embodiment of the present invention is a pallet having a pallet body on which a conveyed object can be placed and is conveyed on a conveyor surface. This pallet is located at the lower part of the pallet body and has a wheel that can rotate about an axle and a wheel lock mechanism that locks or unlocks the rotation of the wheel. The wheel lock mechanism includes a support shaft extending in the transport direction of the pallet, a lock portion fixed to the support shaft and stopping the rotation of the wheel by contacting the wheel, and the support shaft and the lock portion. The lock portion has an urging portion for urging the first position where the lock portion comes into contact with the wheel. The support shaft projects from the pallet body in the transport direction.
　本発明の一実施形態に係るパレット搬送システム及びパレットによれば、ストッパによってパレットを停止させる際に、前記パレットの静定時間を短縮することができる。 According to the pallet transport system and the pallet according to the embodiment of the present invention, when the pallet is stopped by the stopper, the statically indeterminating time of the pallet can be shortened.
図１は、本発明の実施形態１に係るパレット搬送システムの概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of a pallet transfer system according to the first embodiment of the present invention. 図２は、パレットの概略構成を示す平面図である。FIG. 2 is a plan view showing a schematic configuration of a pallet. 図３は、図２のＩＩＩ－ＩＩＩ線断面図である。FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 図４は、パレットがコンベアと共に移動する状態を模式的に示す図である。FIG. 4 is a diagram schematically showing a state in which the pallet moves together with the conveyor. 図５は、パレットがストッパに接触した状態を模式的に示す図である。FIG. 5 is a diagram schematically showing a state in which the pallet is in contact with the stopper. 図６は、搬送路とパレットとの関係を示す平面図である。FIG. 6 is a plan view showing the relationship between the transport path and the pallet. 図７は、本実施形態の構成を有するパレット搬送システムにおける静定時間の一例を模式的に示す図である。FIG. 7 is a diagram schematically showing an example of a statically indeterminate time in a pallet transfer system having the configuration of the present embodiment. 図８は、パレットと一対のガイド部との間に隙間がない場合の静定時間を模式的に示す図である。FIG. 8 is a diagram schematically showing the statically indeterminate time when there is no gap between the pallet and the pair of guide portions. 図９は、左右で支持軸の前方への突出長さが異なる場合のパレットの概略構成を示す平面図である。FIG. 9 is a plan view showing a schematic configuration of a pallet when the left and right support shafts have different forward protrusion lengths. 図１０は、コンベアで搬送されているパレットがストッパに接触した状態を模式的に示す平面図である。FIG. 10 is a plan view schematically showing a state in which the pallet conveyed by the conveyor is in contact with the stopper. 図１１は、実施形態２に係るパレット搬送システムのパレットの概略構成を示す図である。FIG. 11 is a diagram showing a schematic configuration of a pallet of the pallet transfer system according to the second embodiment. 図１２は、パレットがストッパに接触した状態を模式的に示す図である。FIG. 12 is a diagram schematically showing a state in which the pallet is in contact with the stopper. 図１３は、パレットがストッパに接触した後、ストッパに対して搬送方向とは反対方向に移動した状態を模式的に示す図である。FIG. 13 is a diagram schematically showing a state in which the pallet moves in the direction opposite to the transport direction with respect to the stopper after the pallet comes into contact with the stopper.
　以下、図面を参照し、本発明の実施の形態を詳しく説明する。なお、図中の同一または相当部分については同一の符号を付してその説明は繰り返さない。また、各図中の構成部材の寸法は、実際の構成部材の寸法及び各構成部材の寸法比率等を忠実に表したものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated. Further, the dimensions of the constituent members in each drawing do not faithfully represent the dimensions of the actual constituent members and the dimensional ratio of each constituent member.
　なお、以下の説明において、パレット２の搬送方向を「前方向」といい、パレット２の搬送方向とは反対方向を「後方向」という。また、パレット２上の搬送物Ｍから見て、搬送方向に対して左を、「左方向」といい、搬送方向に対して右を、「右方向」という。 In the following description, the transport direction of the pallet 2 is referred to as "forward direction", and the direction opposite to the transport direction of the pallet 2 is referred to as "rear direction". Further, when viewed from the conveyed object M on the pallet 2, the left with respect to the conveyed direction is referred to as "left direction", and the right with respect to the conveyed direction is referred to as "right direction".
　　［実施形態１］
　（パレット搬送システム）
　図１は、本発明の実施形態１に係るパレット搬送システム１の概略構成を示す図である。パレット搬送システム１は、搬送物Ｍが載置されたパレット２を、コンベア３によって搬送するシステムである。パレット搬送システム１は、例えば、搬送物Ｍを検査する検査装置、搬送物Ｍを加工する加工装置などに用いられる。 [Embodiment 1]
(Pallet transfer system)
FIG. 1 is a diagram showing a schematic configuration of a pallet transfer system 1 according to the first embodiment of the present invention. The pallet transfer system 1 is a system that conveys the pallet 2 on which the conveyed object M is placed by the conveyor 3. The pallet transfer system 1 is used, for example, as an inspection device for inspecting a transported object M, a processing device for processing a transported object M, and the like.
　パレット搬送システム１は、複数のパレット２と、コンベア３と、一対のガイド部４と、ストッパ５とを有する。コンベア３は、図示しない駆動機構によって一方向に移動可能である。コンベア３は、例えば、無端帯状のコンベアベルトである。コンベア３の上面は、複数のパレット２を搬送する搬送面３ａである。 The pallet transfer system 1 has a plurality of pallets 2, a conveyor 3, a pair of guide portions 4, and a stopper 5. The conveyor 3 can be moved in one direction by a drive mechanism (not shown). The conveyor 3 is, for example, an endless band-shaped conveyor belt. The upper surface of the conveyor 3 is a conveyor surface 3a that conveys a plurality of pallets 2.
　一対のガイド部４は、コンベア３の幅方向の両側に位置する。一対のガイド部４は、コンベア３の移動方向に延びる板状の部材である。一対のガイド部４の間には、コンベア３に沿って延びる搬送路Ｒが構成される。 The pair of guide portions 4 are located on both sides of the conveyor 3 in the width direction. The pair of guide portions 4 are plate-shaped members extending in the moving direction of the conveyor 3. A transport path R extending along the conveyor 3 is formed between the pair of guide portions 4.
　ストッパ５は、図示しない駆動機構によって、コンベア３の所定位置で上下移動する。ストッパ５は、コンベア３上に載せられたパレット２を、コンベア３に対して停止させるための部材である。ストッパ５は、コンベア３に対して、パレット２を止められる高さ位置まで下降し、パレット２の移動を許容する場合には、パレット２の移動を阻害しない高さ位置まで上昇する。 The stopper 5 moves up and down at a predetermined position on the conveyor 3 by a drive mechanism (not shown). The stopper 5 is a member for stopping the pallet 2 mounted on the conveyor 3 with respect to the conveyor 3. The stopper 5 descends to a height position at which the pallet 2 can be stopped with respect to the conveyor 3, and when the movement of the pallet 2 is allowed, the stopper 5 rises to a height position that does not hinder the movement of the pallet 2.
　複数のパレット２は、コンベア３上に、搬送方向に並んで位置する。複数のパレット２は、コンベア３上に載せられた状態で、コンベア３と共に搬送方向に移動する。よって、パレット２の搬送方向は、コンベア３の移動方向であり、コンベア３の搬送面３ａが延びる方向である。 The plurality of pallets 2 are located side by side on the conveyor 3 in the transport direction. The plurality of pallets 2 move in the transport direction together with the conveyor 3 while being placed on the conveyor 3. Therefore, the transport direction of the pallet 2 is the moving direction of the conveyor 3, and is the direction in which the transport surface 3a of the conveyor 3 extends.
　図２は、パレット２の概略構成を示す平面図である。図３は、図２のＩＩＩ－ＩＩＩ線断面図である。図２及び図３に示すように、パレット２は、パレット本体２１と、複数の車輪２２と、車輪ロック機構２３とを有する。 FIG. 2 is a plan view showing a schematic configuration of the pallet 2. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. As shown in FIGS. 2 and 3, the pallet 2 has a pallet body 21, a plurality of wheels 22, and a wheel locking mechanism 23.
　パレット本体２１は、搬送物Ｍを載置可能な平板状の部材である。本実施形態では、パレット本体２１は、平面視で矩形状である。 The pallet body 21 is a flat plate-shaped member on which the conveyed object M can be placed. In the present embodiment, the pallet body 21 has a rectangular shape in a plan view.
　複数の車輪２２は、パレット本体２１の下部に、車軸Ｐを中心として回転可能に支持されている。複数の車輪２２は、パレット本体２１に対して前後に並んで位置する。すなわち、複数の車輪２２は、パレット本体２１に対して搬送方向に並んでいる。本実施形態では、複数の車輪２２は、平面視でパレット本体２１の四隅に位置する。また、本実施形態では、車軸Ｐは、コンベア３の搬送面３ａに対して平行である。パレット本体２１は、複数の車輪２２によって、コンベア３に対して移動可能である。 The plurality of wheels 22 are rotatably supported at the lower part of the pallet body 21 around the axle P. The plurality of wheels 22 are located side by side with respect to the pallet body 21. That is, the plurality of wheels 22 are arranged in the transport direction with respect to the pallet body 21. In the present embodiment, the plurality of wheels 22 are located at the four corners of the pallet body 21 in a plan view. Further, in the present embodiment, the axle P is parallel to the transport surface 3a of the conveyor 3. The pallet body 21 can be moved with respect to the conveyor 3 by a plurality of wheels 22.
　車輪ロック機構２３は、複数の車輪２２の回転をロックまたはロック解除する。車輪ロック機構２３は、パレット本体２１に支持されている。なお、車輪ロック機構２３は、複数の車輪２２を同時にロックまたはロック解除してもよいし、複数の車輪２２を別々にロックまたはロック解除してもよい。 The wheel lock mechanism 23 locks or unlocks the rotation of the plurality of wheels 22. The wheel lock mechanism 23 is supported by the pallet body 21. The wheel lock mechanism 23 may lock or unlock a plurality of wheels 22 at the same time, or may lock or unlock the plurality of wheels 22 separately.
　車輪ロック機構２３は、複数のロック部２６と、支持軸２７と、バネ２８とを有する。
複数のロック部２６は、複数の車輪２２に対して後方に位置する。各ロック部２６は、各車輪２２に接触することにより、各車輪２２の回転をロックする。 The wheel lock mechanism 23 has a plurality of lock portions 26, a support shaft 27, and a spring 28.
The plurality of lock portions 26 are located rearward with respect to the plurality of wheels 22. Each lock portion 26 locks the rotation of each wheel 22 by coming into contact with each wheel 22.
　支持軸２７は、複数のロック部２６のうち少なくとも一部のロック部２６を連結する。
本実施形態では、支持軸２７は、例えばパレット２の前後に並ぶロック部２６を連結する。支持軸２７は、棒状の部材であり、パレット本体２１を前後方向に貫通している。複数のロック部２６は、それぞれ、支持軸２７に固定されている。 The support shaft 27 connects at least a part of the lock portions 26 among the plurality of lock portions 26.
In the present embodiment, the support shaft 27 connects, for example, the lock portions 26 arranged in front of and behind the pallet 2. The support shaft 27 is a rod-shaped member and penetrates the pallet body 21 in the front-rear direction. Each of the plurality of lock portions 26 is fixed to the support shaft 27.
　支持軸２７の前端部２７ａは、パレット本体２１の前面から前方に突出している。パレット２において、支持軸２７の前端部２７ａが最も前方に位置する。支持軸２７においてパレット本体２１の前面から前方に突出している部分が突起部２７ｂである。前端部２７ａは、突起部２７ｂの前端に位置する。よって、前端部２７ａ及び突起部２７ｂが、ストッパ５に接触する接触部である。 The front end portion 27a of the support shaft 27 projects forward from the front surface of the pallet body 21. In the pallet 2, the front end portion 27a of the support shaft 27 is located at the frontmost position. The portion of the support shaft 27 that protrudes forward from the front surface of the pallet body 21 is the protrusion 27b. The front end portion 27a is located at the front end of the protrusion portion 27b. Therefore, the front end portion 27a and the protrusion portion 27b are contact portions that come into contact with the stopper 5.
　支持軸２７の軸方向の一部の外周には、バネ２８が位置する。バネ２８は、圧縮バネであり、圧縮方向に変形することで弾性復元力を生じる。バネ２８の前端は、支持軸２７に対して固定されている一方、バネ２８の後端は、パレット本体２１に接触している。バネ２８は、パレット本体２１に対して支持軸２７を前に付勢している。なお、バネ２８は、支持軸２７の軸方向の１箇所のみに位置していてもよいし、支持軸２７の軸方向の複数箇所に位置していてもよい。 A spring 28 is located on the outer circumference of a part of the support shaft 27 in the axial direction. The spring 28 is a compression spring, and deforms in the compression direction to generate an elastic restoring force. The front end of the spring 28 is fixed to the support shaft 27, while the rear end of the spring 28 is in contact with the pallet body 21. The spring 28 urges the support shaft 27 forward with respect to the pallet body 21. The spring 28 may be located at only one position in the axial direction of the support shaft 27, or may be located at a plurality of positions in the axial direction of the support shaft 27.
　これにより、支持軸２７に固定されたロック部２６は、車輪２２に押し付けられている。そのため、支持軸２７に後方への力が入力されない状態では、車輪２２は、車輪ロック機構２３によって回転がロックされたロック状態である。車輪２２をロックするロック部２６の位置が、第１位置である。すなわち、ロック部２６の第１位置は、支持軸２７に対して外から力が加わっていないときのロック部２６の位置である。 As a result, the lock portion 26 fixed to the support shaft 27 is pressed against the wheel 22. Therefore, in a state where no rear force is input to the support shaft 27, the wheel 22 is in a locked state in which the rotation is locked by the wheel lock mechanism 23. The position of the lock portion 26 that locks the wheel 22 is the first position. That is, the first position of the lock portion 26 is the position of the lock portion 26 when no external force is applied to the support shaft 27.
　なお、バネ２８が、ロック部２６を車輪２２に接触する第１位置に付勢する付勢部として機能する。 The spring 28 functions as an urging portion that urges the lock portion 26 to the first position in contact with the wheel 22.
　（ストッパによるパレット停止）
　次に、ストッパ５によってパレット２を所定位置に止める場合のパレット２の動きを、図４及び図５を用いて説明する。図４は、パレット２がコンベア３と共に移動する状態を模式的に示す図である。図５は、パレット２がストッパ５に接触した状態を模式的に示す図である。 (Palette stop due to stopper)
Next, the movement of the pallet 2 when the pallet 2 is stopped at a predetermined position by the stopper 5 will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram schematically showing a state in which the pallet 2 moves together with the conveyor 3. FIG. 5 is a diagram schematically showing a state in which the pallet 2 is in contact with the stopper 5.
　支持軸２７の前端部２７ａがストッパ５に接触していない状態では、図４に実線矢印で示すように、支持軸２７は、バネ２８によって前方に付勢されている。そのため、支持軸２７に固定されたロック部２６は、第１位置に位置する。よって、ロック部２６は、車輪２２に接触して、車輪２２の回転をロックする。 When the front end portion 27a of the support shaft 27 is not in contact with the stopper 5, the support shaft 27 is urged forward by the spring 28 as shown by the solid arrow in FIG. Therefore, the lock portion 26 fixed to the support shaft 27 is located at the first position. Therefore, the lock portion 26 comes into contact with the wheel 22 and locks the rotation of the wheel 22.
　上述のように車輪２２がロック部２６によってロックされた状態では、車輪２２は、コンベア３に対して回転しない。よって、パレット２は、図４に白抜き矢印で示すように、コンベア３と共に、コンベア３の移動方向に移動する。したがって、パレット２は、コンベア３によって搬送方向に搬送される。なお、図４において、コンベア３の移動方向は、斜線付き矢印で示す。 As described above, in the state where the wheel 22 is locked by the lock portion 26, the wheel 22 does not rotate with respect to the conveyor 3. Therefore, the pallet 2 moves in the moving direction of the conveyor 3 together with the conveyor 3, as shown by the white arrow in FIG. Therefore, the pallet 2 is conveyed in the conveying direction by the conveyor 3. In FIG. 4, the moving direction of the conveyor 3 is indicated by an arrow with diagonal lines.
　図５に実線矢印で示すように、支持軸２７の前端部２７ａがストッパ５に接触すると、支持軸２７は後方に移動する。これにより、支持軸２７に固定されたロック部２６も後方に移動する。ロック部２６が車輪２２に対して後方に離間すると、車輪２２のロック状態が解除される。ロック部２６が車輪２２に対して後方に離間した位置が、ロック部２６の第２位置である。すなわち、ロック部２６の第２位置は、支持軸２７に対して後方に力が加わったときのロック部２６の位置である。 As shown by the solid arrow in FIG. 5, when the front end portion 27a of the support shaft 27 comes into contact with the stopper 5, the support shaft 27 moves rearward. As a result, the lock portion 26 fixed to the support shaft 27 also moves rearward. When the lock portion 26 is separated rearward from the wheel 22, the locked state of the wheel 22 is released. The position where the lock portion 26 is separated rearward from the wheel 22 is the second position of the lock portion 26. That is, the second position of the lock portion 26 is the position of the lock portion 26 when a force is applied rearward to the support shaft 27.
　上述の支持軸２７の後方への移動によって、バネ２８は、圧縮方向に変形を生じる。よって、バネ２８には、支持軸２７を前方に押し戻す弾性復元力が生じている。 The rearward movement of the support shaft 27 causes the spring 28 to be deformed in the compression direction. Therefore, the spring 28 has an elastic restoring force that pushes the support shaft 27 forward.
　図５に白抜き矢印で示すように、車輪２２のロック状態が解除されると、車輪２２は、コンベア３に対して回転可能である。そのため、支持軸２７がストッパ５に接触した際に受ける反力によって、パレット２は、ストッパ５から離れる方向、すなわち、コンベア３の搬送方向とは反対方向に移動する。 As shown by the white arrow in FIG. 5, when the locked state of the wheel 22 is released, the wheel 22 can rotate with respect to the conveyor 3. Therefore, the pallet 2 moves away from the stopper 5, that is, in the direction opposite to the transport direction of the conveyor 3, due to the reaction force received when the support shaft 27 comes into contact with the stopper 5.
　パレット２がストッパ５に対して搬送方向の反対方向に離間すると、支持軸２７の前端がストッパ５から離れるため、支持軸２７は、図４に実線矢印で示すように、バネ２８の弾性復元力によって前方に移動する。そうすると、支持軸２７に固定されたロック部２６も前方に移動して、車輪２２に接触する。これにより、ロック部２６が車輪２２を再びロックする。 When the pallet 2 is separated from the stopper 5 in the direction opposite to the transport direction, the front end of the support shaft 27 is separated from the stopper 5. Therefore, the support shaft 27 has an elastic restoring force of the spring 28 as shown by the solid arrow in FIG. Move forward by. Then, the lock portion 26 fixed to the support shaft 27 also moves forward and comes into contact with the wheel 22. As a result, the lock portion 26 locks the wheel 22 again.
　ロック部２６によって車輪２２がロックされると、車輪２２は、コンベア３に対して回転しない。よって、パレット２は、図４に白抜き矢印で示すように、コンベア３と共に、コンベア３の移動方向に移動する。したがって、パレット２は、コンベア３によって搬送方向に搬送される。その後、パレット２の支持軸２７の前端部２７ａは、再び、ストッパ５に接触し、パレット２は、図５に示す動作を行う。このように、パレット２は、図４及び図５に示す動作を繰り返し行う。 When the wheel 22 is locked by the lock portion 26, the wheel 22 does not rotate with respect to the conveyor 3. Therefore, the pallet 2 moves in the moving direction of the conveyor 3 together with the conveyor 3, as shown by the white arrow in FIG. Therefore, the pallet 2 is conveyed in the conveying direction by the conveyor 3. After that, the front end portion 27a of the support shaft 27 of the pallet 2 comes into contact with the stopper 5 again, and the pallet 2 performs the operation shown in FIG. In this way, the pallet 2 repeats the operations shown in FIGS. 4 and 5.
　本実施形態のパレット２は、上述の車輪ロック機構２３を有するため、パレット２がストッパ５に最初に接触してから、パレット２を所定位置で停止させるまでの静定時間が必要である。この静定時間は、パレット搬送システム１でパレット２を搬送して他の装置で搬送物Ｍに対して作業を行う際の作業時間に大きく影響する。 Since the pallet 2 of the present embodiment has the wheel lock mechanism 23 described above, a static time is required from the first contact of the pallet 2 with the stopper 5 until the pallet 2 is stopped at a predetermined position. This statically indeterminate time greatly affects the work time when the pallet 2 is conveyed by the pallet transfer system 1 and the work is performed on the conveyed object M by another device.
　（搬送路とパレットとの関係）
　図６は、搬送路Ｒとパレット２との関係を示す平面図である。 (Relationship between transport path and pallet)
FIG. 6 is a plan view showing the relationship between the transport path R and the pallet 2.
　搬送路Ｒは、コンベア３によってパレット２を搬送する空間である。搬送路Ｒは、既述のとおり、コンベア３の搬送面３ａと、その幅方向の両側に位置する一対のガイド部４とによって構成される。 The transport path R is a space for transporting the pallet 2 by the conveyor 3. As described above, the transport path R is composed of a transport surface 3a of the conveyor 3 and a pair of guide portions 4 located on both sides in the width direction thereof.
　搬送路Ｒを搬送されたパレット２の支持軸２７の前端部２７ａがストッパ５に接触した後、パレット２が搬送方向とは反対方向に移動する際に、パレット本体２１の後部２１ａは、一対のガイド部４のいずれか一方に接触する。パレット本体２１の後部２１ａは、パレット本体２１の後側部分の角部である。これにより、パレット２には、図６に破線矢印で示すように、搬送方向に減衰力が加わる。よって、パレット２がストッパ５に対して離れる方向に移動するのを抑制できる。したがって、ストッパ５によってパレット２を止める際に、パレット２の静定時間を短縮することができる。 After the front end portion 27a of the support shaft 27 of the support shaft 27 of the pallet 2 conveyed along the transport path R comes into contact with the stopper 5, when the pallet 2 moves in the direction opposite to the transport direction, the rear portion 21a of the pallet body 21 is paired. Contact one of the guide portions 4. The rear portion 21a of the pallet body 21 is a corner portion of the rear portion of the pallet body 21. As a result, a damping force is applied to the pallet 2 in the transport direction as shown by the broken line arrow in FIG. Therefore, it is possible to prevent the pallet 2 from moving in the direction away from the stopper 5. Therefore, when the pallet 2 is stopped by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
　すなわち、支持軸２７の前端部２７ａがストッパ５に接触した後に、一対のガイド部４と接触するパレット本体２１の後部２１ａが、パレット２に対して搬送方向に減衰力を生じる減衰部として機能する。 That is, after the front end portion 27a of the support shaft 27 comes into contact with the stopper 5, the rear portion 21a of the pallet body 21 that comes into contact with the pair of guide portions 4 functions as a damping portion that generates a damping force with respect to the pallet 2. ..
　本実施形態では、上述のような減衰部としての機能をより高めるために、一対のガイド部４は、搬送面３ａを上から見て、搬送面３ａ上に位置するパレット２との間に、パレット２が搬送方向に対して斜めに傾くのを許容する所定の隙間Ｄを有する。 In the present embodiment, in order to further enhance the function as the damping portion as described above, the pair of guide portions 4 are placed between the transport surface 3a and the pallet 2 located on the transport surface 3a when viewed from above. It has a predetermined gap D that allows the pallet 2 to tilt diagonally with respect to the transport direction.
　所定の隙間Ｄは、パレット２が搬送方向に対して斜めに傾くことにより、パレット本体２１の後部２１ａが一対のガイド部４のうち一方に接触して搬送方向に減衰力を発生可能な寸法である。所定の隙間Ｄは、パレット２と一対のガイド部４との摩擦低減や摩耗抑制を実現するための隙間よりも広い隙間に設定される。 The predetermined gap D has dimensions such that when the pallet 2 is tilted diagonally with respect to the transport direction, the rear portion 21a of the pallet body 21 comes into contact with one of the pair of guide portions 4 to generate a damping force in the transport direction. be. The predetermined gap D is set to be wider than the gap for realizing friction reduction and wear suppression between the pallet 2 and the pair of guide portions 4.
　所定の隙間Ｄは、大きいほど、パレットが搬送方向に対して大きく傾きやすいので、パレット２とガイド部４との接触によって得られる減衰力は大きくなる。しかしながら、所定の隙間Ｄが大きすぎると、パレット２が搬送方向に対して斜めに傾いた場合に、パレット２の移動を阻害したり、ストッパ５によるパレット２の位置決め精度に影響を与えたりする。 The larger the predetermined gap D, the larger the pallet tends to tilt with respect to the transport direction, so that the damping force obtained by the contact between the pallet 2 and the guide portion 4 becomes large. However, if the predetermined gap D is too large, when the pallet 2 is tilted obliquely with respect to the transport direction, the movement of the pallet 2 may be hindered or the positioning accuracy of the pallet 2 by the stopper 5 may be affected.
　そのため、所定の隙間Ｄの上限値は、パレット２が搬送方向に対して斜めに傾いた場合に、パレット２の移動を阻害しない程度またはストッパ５によるパレット２の位置決め精度に影響を与えない程度の寸法に設定される。例えば、所定の隙間Ｄは、０．３ｍｍ以下が好ましい。なお、所定の隙間Ｄは、パレット２とガイド部４との隙間である。 Therefore, the upper limit of the predetermined gap D is such that when the pallet 2 is tilted diagonally with respect to the transport direction, the movement of the pallet 2 is not hindered or the positioning accuracy of the pallet 2 by the stopper 5 is not affected. Set to dimensions. For example, the predetermined gap D is preferably 0.3 mm or less. The predetermined gap D is a gap between the pallet 2 and the guide portion 4.
　上述の構成により、ストッパ５に接触した後のパレット２に対して搬送方向に減衰力を与えることができる。よって、ストッパ５によってパレット２を所定位置に停止させる際の静定時間を短縮することができる。 With the above configuration, it is possible to apply a damping force in the transport direction to the pallet 2 after it comes into contact with the stopper 5. Therefore, it is possible to shorten the statically indeterminating time when the pallet 2 is stopped at a predetermined position by the stopper 5.
　図７は、本実施形態の構成を有するパレット搬送システム１における前記静定時間の一例を模式的に示す図である。図８は、パレット２と一対のガイド部４との間に隙間がない場合の前記静定時間を模式的に示す図である。 FIG. 7 is a diagram schematically showing an example of the statically indeterminate time in the pallet transfer system 1 having the configuration of the present embodiment. FIG. 8 is a diagram schematically showing the statically indeterminate time when there is no gap between the pallet 2 and the pair of guide portions 4.
　図８に示すように、パレット２と一対のガイド部４との間に隙間がない場合には、パレット２に対して搬送方向に減衰力が生じにくいため、パレット２がストッパ５によって所定位置に止まるまでの静定時間が長い。 As shown in FIG. 8, when there is no gap between the pallet 2 and the pair of guide portions 4, a damping force is unlikely to be generated in the transport direction with respect to the pallet 2, so that the pallet 2 is placed in a predetermined position by the stopper 5. The statically indeterminate time until it stops is long.
　これに対し、図７に示すように、本実施形態のようにパレット２と一対のガイド部４との間に所定の隙間Ｄがある場合には、パレット２がストッパ５に接触した後に一対のガイド部４と接触して搬送方向に減衰力を受けるため、図８に示す場合よりも、前記静定時間が短い。 On the other hand, as shown in FIG. 7, when there is a predetermined gap D between the pallet 2 and the pair of guide portions 4 as in the present embodiment, the pair after the pallet 2 comes into contact with the stopper 5. Since it comes into contact with the guide portion 4 and receives a damping force in the transport direction, the statically indeterminating time is shorter than in the case shown in FIG.
　よって、本実施形態の構成を有するパレット搬送システム１では、ストッパ５によってパレット２を所定位置で停止させる際の静定時間を短くすることができる。 Therefore, in the pallet transfer system 1 having the configuration of the present embodiment, the statically indeterminate time when the pallet 2 is stopped at a predetermined position can be shortened by the stopper 5.
　以上より、本実施形態では、パレット搬送システム１は、搬送物Ｍを載置可能なパレット本体２１を有するパレット２と、パレット２を搬送する搬送面３ａを有するコンベア３と、コンベア３の搬送面３ａに沿って搬送方向に延びていて、コンベア３の搬送面３ａ上で搬送されるパレット２をガイドするガイド部４と、パレット２を搬送面３ａ上の所定位置で停止させるストッパ５と、を有する。パレット２は、ストッパ５に接触する支持軸２７の前端部２７ａと、接触部がストッパ５に接触した後に、パレット２に対して搬送方向に減衰力を生じる減衰部と、を有する。この減衰部は、本実施形態では、パレット本体２１の後部２１ａである。 From the above, in the present embodiment, the pallet transport system 1 includes a pallet 2 having a pallet body 21 on which a transport object M can be placed, a conveyor 3 having a transport surface 3a for transporting the pallet 2, and a conveyor 3 transport surface. A guide portion 4 extending in the transport direction along 3a to guide the pallet 2 transported on the transport surface 3a of the conveyor 3, and a stopper 5 for stopping the pallet 2 at a predetermined position on the transport surface 3a. Have. The pallet 2 has a front end portion 27a of the support shaft 27 that comes into contact with the stopper 5, and a damping portion that generates a damping force in the transport direction with respect to the pallet 2 after the contact portion comes into contact with the stopper 5. In the present embodiment, this damping portion is the rear portion 21a of the pallet body 21.
　コンベア３の搬送面３ａ上で搬送されているパレット２をストッパ５によって所定位置で停止させる場合、パレット２は、支持軸２７の前端部２７ａでストッパ５に接触する。このとき、パレット２は、ストッパ５と接触した後に搬送方向とは逆方向に跳ね返る。その際に、パレット本体２１の後部２１ａは、ガイド部４と接触する。これにより、前記跳ね返る力を、パレット本体２１の後部２１ａがガイド部４と接触した際に生じる搬送方向の減衰力によって減衰させることができる。よって、上述の構成により、パレット２をストッパ５によって搬送面３ａの前記所定位置で停止させる際に、パレット２の静定時間を短縮することができる。 When the pallet 2 transported on the transport surface 3a of the conveyor 3 is stopped at a predetermined position by the stopper 5, the pallet 2 comes into contact with the stopper 5 at the front end portion 27a of the support shaft 27. At this time, the pallet 2 rebounds in the direction opposite to the transport direction after coming into contact with the stopper 5. At that time, the rear portion 21a of the pallet body 21 comes into contact with the guide portion 4. As a result, the rebounding force can be damped by the damping force in the transport direction generated when the rear portion 21a of the pallet body 21 comes into contact with the guide portion 4. Therefore, according to the above configuration, when the pallet 2 is stopped at the predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
　ガイド部４は、搬送面３ａを上から見て、搬送面３ａ上に位置するパレット２との間に、パレット２が搬送方向に対して斜めに傾くのを許容する所定の隙間Ｄを有する。減衰部は、パレット２において、搬送方向に対してパレット２が斜めに傾いた状態でガイド部４と接触する後部２１ａである。 The guide portion 4 has a predetermined gap D between the pallet 2 located on the transport surface 3a and the transport surface 3a when the transport surface 3a is viewed from above, which allows the pallet 2 to be tilted diagonally with respect to the transport direction. The damping portion is a rear portion 21a of the pallet 2 that comes into contact with the guide portion 4 in a state where the pallet 2 is tilted obliquely with respect to the transport direction.
　搬送面３ａを上から見て、ガイド部４が、パレット２との間に所定の隙間Ｄを有することにより、パレット２は搬送方向に対して斜めに傾く。これにより、パレット本体２１の後部２１ａが、ガイド部４に接触する。この接触によって、ストッパ５に接触したパレット２が搬送方向とは反対方向に跳ね返る力を減衰することができる。よって、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間を短縮することができる。 When the transport surface 3a is viewed from above, the guide portion 4 has a predetermined gap D between the guide portion 4 and the pallet 2, so that the pallet 2 is tilted diagonally with respect to the transport direction. As a result, the rear portion 21a of the pallet body 21 comes into contact with the guide portion 4. By this contact, the force that the pallet 2 in contact with the stopper 5 rebounds in the direction opposite to the transport direction can be attenuated. Therefore, when the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
　しかも、上述の構成では、ガイド部４とパレット２との間に所定の隙間Ｄが存在することにより、パレット本体２１がガイド部４に接触して減衰力が生じる。よって、簡単な構成で、パレット２の静定時間の短縮を実現できる。 Moreover, in the above configuration, the presence of a predetermined gap D between the guide portion 4 and the pallet 2 causes the pallet main body 21 to come into contact with the guide portion 4 to generate a damping force. Therefore, it is possible to shorten the statically indeterminating time of the pallet 2 with a simple configuration.
　パレット２は、パレット本体２１の下部に位置し、コンベア３の搬送面３ａに平行な車軸Ｐを中心として回転可能な車輪２２と、車輪２２の回転をロック又はロック解除する車輪ロック機構２３と、をさらに有する。車輪ロック機構２３は、支持軸２７の前端部２７ａがストッパ５に接触した状態では、車輪ロック機構２３に車輪２２の回転のロックを解除させ、支持軸２７の前端部２７ａがストッパ５に接触していない状態では、車輪２２の回転をロックさせる。 The pallet 2 is located at the lower part of the pallet body 21, and has a wheel 22 that can rotate about an axle P parallel to the conveyor surface 3a of the conveyor 3, a wheel lock mechanism 23 that locks or unlocks the rotation of the wheel 22. Further have. When the front end portion 27a of the support shaft 27 is in contact with the stopper 5, the wheel lock mechanism 23 causes the wheel lock mechanism 23 to unlock the rotation of the wheel 22, and the front end portion 27a of the support shaft 27 comes into contact with the stopper 5. In the non-existing state, the rotation of the wheel 22 is locked.
　パレット２のパレット本体２１の下部に位置する車輪２２は、支持軸２７の前端部２７ａがストッパ５に接触するまでは、ロック状態で保持される。よって、パレット２は、コンベア３の搬送面３ａとともに搬送方向に移動する。一方、支持軸２７の前端部２７ａがストッパ５に接触すると、車輪ロック機構２３によって車輪２２のロックが解除される。これにより、車輪２２は、コンベア３の搬送面３ａに対して回転するため、パレット２は搬送面３ａとともに搬送方向に移動しない。 The wheel 22 located at the lower part of the pallet body 21 of the pallet 2 is held in a locked state until the front end portion 27a of the support shaft 27 comes into contact with the stopper 5. Therefore, the pallet 2 moves in the transport direction together with the transport surface 3a of the conveyor 3. On the other hand, when the front end portion 27a of the support shaft 27 comes into contact with the stopper 5, the wheel lock mechanism 23 unlocks the wheel 22. As a result, the wheels 22 rotate with respect to the transport surface 3a of the conveyor 3, so that the pallet 2 does not move in the transport direction together with the transport surface 3a.
　支持軸２７の前端部２７ａがストッパ５に接触した後、パレット２が搬送方向とは反対方向に跳ね返ると、車輪ロック機構２３は車輪２２の回転をロックさせる。そのため、パレット２は、再度、コンベア３の搬送面３ａとともに搬送方向に移動する。 After the front end portion 27a of the support shaft 27 comes into contact with the stopper 5, when the pallet 2 bounces in the direction opposite to the transport direction, the wheel lock mechanism 23 locks the rotation of the wheel 22. Therefore, the pallet 2 moves again in the transport direction together with the transport surface 3a of the conveyor 3.
　上述の構成により、パレット２とコンベア３との摩擦による摩耗や、この摩耗による粉塵等の発生を低減することができる。 With the above configuration, it is possible to reduce wear due to friction between the pallet 2 and the conveyor 3 and generation of dust and the like due to this wear.
　しかしながら、上述の構成では、車輪ロック機構２３の動作によって、パレット２がストッパ５に接触した後のパレット２の静定時間が長くなる。これに対し、上述のように動作するパレット２を有するパレット搬送システム１において、上述の各構成を適用することにより、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間を短縮することができる。 However, in the above configuration, the operation of the wheel lock mechanism 23 increases the statically indeterminating time of the pallet 2 after the pallet 2 comes into contact with the stopper 5. On the other hand, in the pallet transfer system 1 having the pallet 2 operating as described above, by applying each of the above configurations, when the pallet 2 is stopped at a predetermined position on the transfer surface 3a by the stopper 5, the pallet is stopped. The statically indeterminate time of 2 can be shortened.
　車輪ロック機構２３は、車輪２２に接触することで車輪２２の回転を停止させるロック部２６と、ロック部２６を、車輪２２に接触する第１位置に付勢するバネ２８と、を有する。支持軸２７の前端部２７ａは、ストッパ５に接触した状態では、バネ２８の付勢力に抗して、ロック部２６を、車輪２２から離間した第２位置に位置付ける。 The wheel lock mechanism 23 has a lock portion 26 that stops the rotation of the wheel 22 by coming into contact with the wheel 22, and a spring 28 that urges the lock portion 26 to a first position in contact with the wheel 22. When the front end portion 27a of the support shaft 27 is in contact with the stopper 5, the lock portion 26 is positioned at a second position away from the wheel 22 against the urging force of the spring 28.
　バネ２８によってロック部２６を車輪２２に接触させ、支持軸２７の前端部２７ａがストッパ５に接触した状態ではバネ２８の付勢力に抗してロック部２６を車輪２２から離間させる構成の場合、パレット２がストッパ５に接触した後に、バネ２８によって大きな跳ね返り力を生じる。そのため、このようにバネ２８によってロック部２６を車輪２２に接触する第１位置に付勢させる構成において、搬送方向に減衰力を生じる本実施形態の構成を適用することにより、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間をより効果的に短縮することができる。 In the case where the lock portion 26 is brought into contact with the wheel 22 by the spring 28 and the lock portion 26 is separated from the wheel 22 against the urging force of the spring 28 in a state where the front end portion 27a of the support shaft 27 is in contact with the stopper 5. After the pallet 2 comes into contact with the stopper 5, the spring 28 produces a large rebounding force. Therefore, in the configuration in which the lock portion 26 is urged to the first position in contact with the wheel 22 by the spring 28 in this way, the pallet 2 is stoppered 5 by applying the configuration of the present embodiment that generates a damping force in the transport direction. Therefore, the statically indeterminating time of the pallet 2 can be shortened more effectively when the pallet 2 is stopped at a predetermined position on the transport surface 3a.
　車輪２２は、パレット２の搬送方向に並ぶ複数の車輪２２を含む。ロック部２６は、複数の車輪２２にそれぞれ接触する複数のロック部２６を含む。バネ２８は、複数のロック部２６を、複数の車輪２２に接触する第１位置に付勢する。支持軸２７の前端部２７ａは、ストッパ５に接触した状態では、ばね２８の付勢力に抗して、複数のロック部２６を、車輪２２から離間した第２位置に位置付ける。 The wheel 22 includes a plurality of wheels 22 arranged in the transport direction of the pallet 2. The lock portion 26 includes a plurality of lock portions 26 that come into contact with each of the plurality of wheels 22. The spring 28 urges the plurality of lock portions 26 to the first position in contact with the plurality of wheels 22. When the front end portion 27a of the support shaft 27 is in contact with the stopper 5, the plurality of lock portions 26 are positioned at a second position away from the wheel 22 against the urging force of the spring 28.
　上述の構成により、パレット２が搬送方向に並ぶ複数の車輪２２を有する場合でも、複数の車輪２２に接触する複数のロック部２６の位置を、バネ２８及び支持軸２７の前端部２７ａによってコントロールすることができる。このように複数の車輪２２に接触する複数のロック部２６の位置をバネ２８及び支持軸２７の前端部２７ａによってコントロールする構成では、パレット２がストッパ５に接触した後に、バネ２８によって、より大きな跳ね返り力を生じる。そのため、複数の車輪２２に接触する複数のロック部２６の位置をバネ２８及び支持軸２７の前端部２７ａによってコントロールする構成において、搬送方向に減衰力を生じる本実施形態の構成を適用することにより、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間をより効果的に短縮することができる。 With the above configuration, even when the pallet 2 has a plurality of wheels 22 arranged in the transport direction, the positions of the plurality of lock portions 26 in contact with the plurality of wheels 22 are controlled by the spring 28 and the front end portion 27a of the support shaft 27. be able to. In such a configuration in which the positions of the plurality of lock portions 26 in contact with the plurality of wheels 22 are controlled by the spring 28 and the front end portions 27a of the support shaft 27, the pallet 2 is made larger by the spring 28 after being in contact with the stopper 5. Generates a rebounding force. Therefore, in a configuration in which the positions of the plurality of lock portions 26 in contact with the plurality of wheels 22 are controlled by the spring 28 and the front end portions 27a of the support shaft 27, the configuration of the present embodiment that generates a damping force in the transport direction is applied. When the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened more effectively.
　しかも、バネ２８及び支持軸２７の前端部２７ａによって、搬送方向に並ぶ複数の車輪２２の回転のロックまたはロック解除を、コントロールできる。よって、簡単な構成により、搬送方向に並ぶ複数の車輪２２の回転のロックまたはロック解除をコントロールできる。 Moreover, the spring 28 and the front end portion 27a of the support shaft 27 can control the locking or unlocking of the rotation of the plurality of wheels 22 arranged in the transport direction. Therefore, with a simple configuration, it is possible to control the locking or unlocking of the rotation of the plurality of wheels 22 arranged in the transport direction.
　パレット２においてストッパ５に接触する接触部は、パレット本体２１から搬送方向に突出する突起部２７ｂを含む。パレット２から搬送方向に突出する突起部２７ｂを、ストッパ５に接触させることにより、パレット２を搬送方向に対して斜めに傾きやすくすることができる。これにより、パレット２の一部を、ガイド部４により確実に接触させることができる。よって、ストッパ５に接触したパレット２が搬送方向とは反対方向に跳ね返る力をより確実に減衰することができる。したがって、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間を短縮することができる。 The contact portion of the pallet 2 that comes into contact with the stopper 5 includes a protrusion 27b that protrudes from the pallet body 21 in the transport direction. By bringing the protrusion 27b protruding from the pallet 2 in the transport direction into contact with the stopper 5, the pallet 2 can be easily tilted diagonally with respect to the transport direction. As a result, a part of the pallet 2 can be reliably brought into contact with the guide portion 4. Therefore, the force of the pallet 2 in contact with the stopper 5 rebounding in the direction opposite to the transport direction can be more reliably damped. Therefore, when the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened.
　本実施形態のパレット２は、搬送物Ｍを載置可能なパレット本体２１を有し、コンベア３の搬送面３ａ上で搬送されるパレットである。パレット２は、パレット本体２１の下部に位置し、車軸Ｐを中心として回転可能な車輪２２と、車輪２２の回転をロック又はロック解除する車輪ロック機構２３と、を有する。車輪ロック機構２３は、パレット２の搬送方向に延びる支持軸２７と、支持軸２７に固定され、車輪２２に接触することで車輪２２の回転を停止させるロック部２６と、支持軸２７及びロック部２６を、ロック部２６が車輪２２に接触する第１位置に付勢するバネ２８と、を有する。支持軸２７は、パレット本体２１から搬送方向に突出している。 The pallet 2 of the present embodiment is a pallet having a pallet body 21 on which a conveyed object M can be placed and is conveyed on the conveyor surface 3a of the conveyor 3. The pallet 2 is located below the pallet body 21 and has a wheel 22 that can rotate about the axle P and a wheel lock mechanism 23 that locks or unlocks the rotation of the wheel 22. The wheel lock mechanism 23 includes a support shaft 27 extending in the transport direction of the pallet 2, a lock portion 26 fixed to the support shaft 27 and stopping the rotation of the wheel 22 by coming into contact with the wheel 22, and a support shaft 27 and a lock portion. 26 has a spring 28 that urges the lock portion 26 to a first position in contact with the wheel 22. The support shaft 27 projects from the pallet body 21 in the transport direction.
　コンベア３の搬送面３ａ上でストッパ５によって所定位置で停止させるパレット２に、上述の構成を適用することにより、パレット２とコンベア３との摩擦による摩耗や、この摩耗による粉塵等の発生を低減することができる。 By applying the above configuration to the pallet 2 that is stopped at a predetermined position by the stopper 5 on the transport surface 3a of the conveyor 3, wear due to friction between the pallet 2 and the conveyor 3 and generation of dust due to this wear are reduced. can do.
　車輪２２は、パレット２の搬送方向に並ぶ複数の車輪２２を含む。ロック部は、複数の車輪２２にそれぞれ接触する複数のロック部２６を含む。支持軸２７には、複数のロック部２６が固定されている。ばね２８は、複数のロック部２６を、複数の車輪２２に接触する第１位置に付勢する。 The wheel 22 includes a plurality of wheels 22 arranged in the transport direction of the pallet 2. The lock portion includes a plurality of lock portions 26 that come into contact with each of the plurality of wheels 22. A plurality of lock portions 26 are fixed to the support shaft 27. The spring 28 urges the plurality of locking portions 26 to the first position in contact with the plurality of wheels 22.
　パレット２の搬送方向に並ぶ複数の車輪２２の回転のロック又はロック解除を、支持軸２７の搬送方向の移動により、コントロールすることができる。よって、簡単な構成により、複数の車輪２２の回転のロック又はロック解除をコントロールすることができる。 The rotation of the plurality of wheels 22 arranged in the transport direction of the pallet 2 can be locked or unlocked by moving the support shaft 27 in the transport direction. Therefore, with a simple configuration, it is possible to control the locking or unlocking of the rotation of the plurality of wheels 22.
　（実施形態１の変形例）
　前記実施形態１では、パレット本体２１に対する支持軸２７の前方への突出長さは、パレット２の左右で同じである。しかしながら、前記突出長さは、パレット２の左右で異なっていてもよい。 (Variation example of Embodiment 1)
In the first embodiment, the forward protrusion length of the support shaft 27 with respect to the pallet body 21 is the same on the left and right sides of the pallet 2. However, the protruding length may be different on the left and right sides of the pallet 2.
　図９は、左右で支持軸２７，１２７の前方への突出長さが異なる場合のパレット１０２の概略構成を示す平面図である。図１０は、コンベア３で搬送されているパレット１０２がストッパ５に接触した状態を模式的に示す平面図である。図１０において、符号１０１は、パレット搬送システムである。 FIG. 9 is a plan view showing a schematic configuration of the pallet 102 when the support shafts 27 and 127 have different forward protrusion lengths on the left and right sides. FIG. 10 is a plan view schematically showing a state in which the pallet 102 conveyed by the conveyor 3 is in contact with the stopper 5. In FIG. 10, reference numeral 101 is a pallet transfer system.
　図９に示すように、パレット１０２では、右に位置する支持軸１２７の前方への突出長さが、左に位置する支持軸２７の前方への突出長さよりも大きい。よって、パレット１０２がストッパ５に接触する際には、前記突出長さが大きい支持軸１２７の前端部１２７ａがストッパ５に最初に接触する。図９において、符号２７ｂ及び１２７ｂは、それぞれ、突起部である。 As shown in FIG. 9, in the pallet 102, the forward protrusion length of the support shaft 127 located on the right is larger than the forward protrusion length of the support shaft 27 located on the left. Therefore, when the pallet 102 comes into contact with the stopper 5, the front end portion 127a of the support shaft 127 having a large protrusion length first comes into contact with the stopper 5. In FIG. 9, reference numerals 27b and 127b are protrusions, respectively.
　そのため、図１０に示すように、パレット１０２は、支持軸２７，１２７の前端部２７ａ，１２７ａがストッパ５に接触した後、搬送方向に対して斜めに傾いてパレット本体２１の後部２１ａがガイド部４に接触しやすくなる。 Therefore, as shown in FIG. 10, in the pallet 102, after the front end portions 27a and 127a of the support shafts 27 and 127 come into contact with the stopper 5, the pallet 102 is tilted diagonally with respect to the transport direction and the rear portion 21a of the pallet body 21 is a guide portion. It becomes easy to come into contact with 4.
　このように、本変形例では、パレット本体２１に対する左右の支持軸２７の前方への突出長さを変えることにより、パレット本体２１の一部がガイド部４に接触しやすくすることができる。これにより、パレット１０２に、搬送方向の減衰力を容易に生じさせることができる。 As described above, in this modification, by changing the forward protrusion length of the left and right support shafts 27 with respect to the pallet body 21, a part of the pallet body 21 can be easily contacted with the guide portion 4. As a result, a damping force in the transport direction can be easily generated in the pallet 102.
　パレット１０２においてストッパ５に接触する接触部は、パレット本体２１から搬送方向に突出する複数の突起部を含む。複数の突起部のうち少なくとも２つの突起部２７ｂ，１２７ｂは、搬送方向の突出長さが異なる。 The contact portion in contact with the stopper 5 in the pallet 102 includes a plurality of protrusions protruding from the pallet body 21 in the transport direction. At least two of the plurality of protrusions 27b and 127b have different protrusion lengths in the transport direction.
　少なくとも２つの突起部２７ｂ，１２７ｂにおける搬送方向の突出長さが異なることにより、搬送面３ａを上から見て、パレット２を、搬送方向に対してより斜めに傾いた状態でガイド部４に接触させることができる。この接触によって、ストッパ５に接触したパレット２が搬送方向とは反対方向に跳ね返る力を減衰することができる。 Since the protrusion lengths of at least two protrusions 27b and 127b in the transport direction are different, the pallet 2 is in contact with the guide portion 4 in a state of being tilted more obliquely with respect to the transport direction when the transport surface 3a is viewed from above. Can be made to. By this contact, the force that the pallet 2 in contact with the stopper 5 rebounds in the direction opposite to the transport direction can be attenuated.
　よって、パレット２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２の静定時間をより確実に短縮することができる。 Therefore, when the pallet 2 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 2 can be shortened more reliably.
　なお、パレット１０２において、左に位置する支持軸の前方への突出長さが、右に位置する支持軸の前方への突出長さよりも大きくてもよい。パレット１０２において、左に位置する支持軸及び右に位置する支持軸のうちいずれの支持軸の前方への突出長さを大きくするかは、パレット１０２を搬送方向に対していずれの方向に斜めに傾けるかによって決めればよい。 In the pallet 102, the forward protrusion length of the support shaft located on the left may be larger than the forward protrusion length of the support shaft located on the right. In the pallet 102, which of the support shafts located on the left and the support shafts on the right is to be increased in the forward protrusion length is determined in which direction the pallet 102 is obliquely transported. You can decide whether to tilt it.
　［実施形態２］
　図１１に、実施形態２に係るパレット搬送システムのパレット２０２の概略構成を示す。このパレット２０２は、上下方向に延びる鉛直軸Ｑを中心として回転可能な複数の車輪２２２を有する。パレット搬送システムの構成は、車輪２２２の構成を除いて、実施形態１のパレット搬送システム１の構成と同様である。よって、以下では、実施形態１と同様の構成については説明を省略し、パレット２０２の車輪２２２の構成についてのみ説明する。 [Embodiment 2]
FIG. 11 shows a schematic configuration of the pallet 202 of the pallet transfer system according to the second embodiment. The pallet 202 has a plurality of wheels 222 that can rotate about a vertical axis Q extending in the vertical direction. The configuration of the pallet transfer system is the same as the configuration of the pallet transfer system 1 of the first embodiment except for the configuration of the wheels 222. Therefore, in the following, the description of the same configuration as that of the first embodiment will be omitted, and only the configuration of the wheel 222 of the pallet 202 will be described.
　パレット２０２は、パレット本体２２１と、複数の車輪２２２とを有する。パレット本体２２１は、例えば直方体状の部材である。本実施形態では、複数の車輪２２２は、４つの車輪２２２である。本実施形態では、パレット本体２２１の４隅の下部に、車輪２２２が位置する。 The pallet 202 has a pallet body 221 and a plurality of wheels 222. The pallet body 221 is, for example, a rectangular parallelepiped member. In this embodiment, the plurality of wheels 222 are four wheels 222. In this embodiment, the wheels 222 are located at the lower portions of the four corners of the pallet body 221.
　車輪２２２は、コンベア３の搬送面３ａに対して平行に延びる車軸Ｐを中心として回転する。車輪２２２は、パレット本体２２１に対し、上下方向に延びる鉛直軸Ｑを中心として回転可能である。すなわち、パレット２０２を鉛直方向に見て、車輪２２２の転がり方向は、鉛直軸Ｑを中心とする車輪２２２の回転に応じて、変化する。車輪２２２の転がり方向は、パレット２０２を鉛直方向に見て、車輪２２２が回転する方向を意味する。 The wheels 222 rotate around an axle P extending parallel to the transport surface 3a of the conveyor 3. The wheel 222 can rotate about the vertical axis Q extending in the vertical direction with respect to the pallet main body 221. That is, when the pallet 202 is viewed in the vertical direction, the rolling direction of the wheel 222 changes according to the rotation of the wheel 222 about the vertical axis Q. The rolling direction of the wheel 222 means the direction in which the wheel 222 rotates when the pallet 202 is viewed in the vertical direction.
　図１２は、パレット２０２がストッパ５に接触した状態を示す平面図である。図１３は、パレット２０２がストッパ５に接触した後、ストッパ５に対して搬送方向とは反対方向に移動した状態を示す平面図である。図１２及び図１３において、符号２０１は、パレット搬送システムである。 FIG. 12 is a plan view showing a state in which the pallet 202 is in contact with the stopper 5. FIG. 13 is a plan view showing a state in which the pallet 202 comes into contact with the stopper 5 and then moves in the direction opposite to the transport direction with respect to the stopper 5. In FIGS. 12 and 13, reference numeral 201 is a pallet transfer system.
　図１２に示すように、上述の構成を有するパレット２０２がストッパ５に接触するまでは、複数の車輪２２２の転がり方向は、搬送方向とほぼ同じ方向である。 As shown in FIG. 12, the rolling direction of the plurality of wheels 222 is substantially the same as the transport direction until the pallet 202 having the above configuration comes into contact with the stopper 5.
　しかしながら、図１３に示すように、上述の構成を有するパレット２０２がストッパ５に接触した後、ストッパ５に対して搬送方向とは反対方向に移動したパレット２０２の複数の車輪２２２は、それぞれ、鉛直軸Ｑを中心として回転する。これにより、複数の車輪２２２の転がり方向は、それぞれ異なる方向になる。そうすると、ストッパ５から離間する方向へのパレット２０２の移動を阻害する。 However, as shown in FIG. 13, after the pallet 202 having the above configuration comes into contact with the stopper 5, the plurality of wheels 222 of the pallet 202 that have moved in the direction opposite to the transport direction with respect to the stopper 5 are each vertical. It rotates around the axis Q. As a result, the rolling directions of the plurality of wheels 222 are different from each other. Then, the movement of the pallet 202 in the direction away from the stopper 5 is hindered.
　換言すれば、上述の構成を有する複数の車輪２２２によって、図１３に破線矢印で示すように、パレット２０２に対して搬送方向に減衰力を生じる。よって、本実施形態の複数の車輪２２２は、減衰部として機能する。 In other words, the plurality of wheels 222 having the above configuration generate a damping force in the transport direction with respect to the pallet 202, as shown by the broken line arrow in FIG. Therefore, the plurality of wheels 222 of the present embodiment function as damping portions.
　したがって、ストッパ５に接触したパレット２０２が、ストッパ５によって所定位置に停止するまでの静定時間を短くすることができる。 Therefore, the statically indeterminating time until the pallet 202 in contact with the stopper 5 stops at a predetermined position by the stopper 5 can be shortened.
　以上より、本実施形態では、減衰部は、パレット本体２２１の下部に位置する車輪２２２を含む。車輪２２２は、コンベア３の搬送面３ａに平行な車軸Ｐを中心として回転可能で且つ鉛直方向に延びる鉛直軸Ｑを中心として回転可能である。 From the above, in the present embodiment, the damping portion includes the wheel 222 located at the lower part of the pallet body 221. The wheels 222 can rotate about an axle P parallel to the conveyor surface 3a of the conveyor 3 and can rotate about a vertical axis Q extending in the vertical direction.
　鉛直軸Ｑを中心として回転可能な車輪２２２の場合、車輪２２２の転がり方向とパレット２０２の搬送方向とが異なる場合がある。このような場合には、車輪２２２と搬送面３ａとの摩擦によって、パレット２０２の移動に対する抵抗力を生じる。よって、パレット２０２が上述の車輪２２２を有することにより、パレット２０２がストッパ５に接触した際に搬送方向とは逆方向に跳ね返る力を受けた場合に、その力を減衰させることができる。したがって、パレット２０２をストッパ５によって搬送面３ａ上の所定位置で停止させる際に、パレット２０２の静定時間を短縮することができる。 In the case of wheels 222 that can rotate around the vertical axis Q, the rolling direction of the wheels 222 and the transport direction of the pallet 202 may differ. In such a case, the friction between the wheel 222 and the transport surface 3a creates a resistance force against the movement of the pallet 202. Therefore, since the pallet 202 has the above-mentioned wheel 222, when the pallet 202 comes into contact with the stopper 5, when it receives a force that rebounds in the direction opposite to the transport direction, the force can be damped. Therefore, when the pallet 202 is stopped at a predetermined position on the transport surface 3a by the stopper 5, the statically indeterminating time of the pallet 202 can be shortened.
　なお、本実施形態のように鉛直軸Ｑを中心して回転する車輪２２２に対して、実施形態１のような車輪ロック機構を適用してもよい。これにより、車輪ロック機構によって車輪２２２のロックが解除されている場合には、上述のように車輪２２２が鉛直軸Ｑを中心として回転するため、パレット２０２がストッパ５から離間するのを抑制する。なお、車輪ロック機構によって車輪２２２がロックされている場合には、実施形態１における車輪２２のロック状態と同様、パレット２０２は、コンベア３と共に搬送方向に移動する。 The wheel lock mechanism as in the first embodiment may be applied to the wheel 222 that rotates about the vertical axis Q as in the present embodiment. As a result, when the wheel 222 is unlocked by the wheel lock mechanism, the wheel 222 rotates about the vertical axis Q as described above, so that the pallet 202 is prevented from being separated from the stopper 5. When the wheels 222 are locked by the wheel lock mechanism, the pallet 202 moves in the transport direction together with the conveyor 3 as in the locked state of the wheels 22 in the first embodiment.
　パレット２０２は、車輪２２２の回転をロック又はロック解除する車輪ロック機構をさらに有する。車輪ロック機構は、接触部がストッパ５に接触した状態では、車輪２２２の回転のロックを解除させ、接触部がストッパ５に接触していない状態では、車輪２２２の回転をロックさせる。なお、前記車輪ロック機構は、実施形態１の車輪ロック機構２３と同様の構成を有するため、前記車輪ロック機構の詳しい説明を省略する。 The pallet 202 further has a wheel locking mechanism that locks or unlocks the rotation of the wheels 222. The wheel lock mechanism unlocks the rotation of the wheel 222 when the contact portion is in contact with the stopper 5, and locks the rotation of the wheel 222 when the contact portion is not in contact with the stopper 5. Since the wheel lock mechanism has the same configuration as the wheel lock mechanism 23 of the first embodiment, detailed description of the wheel lock mechanism will be omitted.
　鉛直軸Ｑを中心として回転可能な車輪２２２の場合でも、上述の実施形態１と同様の作用効果を得ることができる。 Even in the case of the wheel 222 that can rotate about the vertical axis Q, the same effect as that of the first embodiment can be obtained.
　（その他の実施形態）
　以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。 (Other embodiments)
Although the embodiment of the present invention has been described above, the above-described embodiment is merely an example for carrying out the present invention. Therefore, the embodiment is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof.
　前記実施形態１では、パレット２がストッパ５に接触して搬送方向とは反対方向に移動した際に、パレット２の後側部分の右角部がガイド部１４に接触する。しかしながら、パレットの後側部分の左角部がガイド部に接触してもよい。 In the first embodiment, when the pallet 2 comes into contact with the stopper 5 and moves in the direction opposite to the transport direction, the right corner portion of the rear portion of the pallet 2 comes into contact with the guide portion 14. However, the left corner of the rear portion of the pallet may come into contact with the guide portion.
　前記各実施形態では、パレット２，１０２，２０２は、前部の左右に、支持軸２７，１２７の突起部２７ｂ、１２７ｂを有する。しかしながら、パレットは、前部の左右一方のみに、支持軸の突起部を有していてもよい。また、パレットは、前部の左右方向中央に、支持軸の突起部を有していてもよい。パレットを搬送方向に対して傾けるためには、支持軸の突起部は、パレットの全部の左右方向中央以外に位置するのが好ましい。また、パレットは、前部に、３つ以上の支持軸の突起部を有していてもよい。 In each of the above embodiments, the pallets 2, 102, 202 have protrusions 27b, 127b of the support shafts 27, 127 on the left and right sides of the front portion. However, the pallet may have a protrusion of the support shaft on only one of the left and right sides of the front portion. Further, the pallet may have a protrusion of the support shaft at the center of the front portion in the left-right direction. In order to tilt the pallet with respect to the transport direction, it is preferable that the protrusions of the support shaft are located outside the center of all the pallets in the left-right direction. Further, the pallet may have three or more support shaft protrusions on the front portion.
　前記実施形態１では、支持軸２７，１２７には、車輪２２をロックまたはロック解除させるロック部２６が固定されている。しかしながら、パレットは、別の機構によって、車輪のロックまたはロック解除を行う構成を有していてもよい。また、支持軸には、１つのロック部が固定されていてもよいし、３つ以上のロック部が固定されていてもよい。すなわち、パレットにおける車輪の配置に応じて、支持軸に固定するロック部の数を変えてもよい。 In the first embodiment, the lock portion 26 for locking or unlocking the wheel 22 is fixed to the support shafts 27 and 127. However, the pallet may have a configuration that locks or unlocks the wheels by another mechanism. Further, one lock portion may be fixed to the support shaft, or three or more lock portions may be fixed to the support shaft. That is, the number of lock portions fixed to the support shaft may be changed according to the arrangement of the wheels on the pallet.
　前記各実施形態では、パレット搬送システム１，１０１，２０１は、複数のパレット２，１０２，２０２を搬送しているが、１つのパレットのみを搬送してもよい。 In each of the above embodiments, the pallet transfer systems 1, 101, 201 convey a plurality of pallets 2, 102, 202, but only one pallet may be conveyed.
　上述の説明では、前記実施形態１と前記実施形態２とを別の実施形態として記載したが、前記実施形態１及び前記実施形態２の構成を組み合わせてもよい。 In the above description, the first embodiment and the second embodiment are described as different embodiments, but the configurations of the first embodiment and the second embodiment may be combined.
　本発明は、コンベアによってパレットを搬送するパレット搬送システムに利用可能である。 The present invention can be used for a pallet transport system that transports pallets by a conveyor.
１、１０１、２０１　パレット搬送システム
２、１０２、２０２　パレット
３　コンベア
３ａ　搬送面
４　ガイド部
５　ストッパ
２１、２２１　パレット本体
２１ａ　後部
２２、２２２　車輪
２３　車輪ロック機構
２６　ロック部
２７、１２７　支持軸
２７ａ、１２７ａ　前端部（接触部）
２７ｂ、１２７ｂ　突起部（接触部）
２８　バネ（付勢部）
Ｍ　搬送物
Ｐ　車軸
Ｑ　鉛直軸
Ｄ　所定の隙間
Ｒ　搬送路
  1, 101, 201 Pallet transfer system 2, 102, 202 Pallet 3 Conveyor 3a Conveyor surface 4 Guide part 5 Stopper 21, 221 Pallet body 21a Rear part 22, 222 Wheel 23 Wheel lock mechanism 26 Lock part 27, 127 Support shaft 27a, 127a Front end (contact part)
27b, 127b Protrusion (contact part)
28 Spring (Bending part)
M Transported object P Axle Q Vertical shaft D Predetermined gap R Transport path

Claims (11)

  1. 　搬送物を載置可能なパレット本体を有するパレットと、
    　前記パレットを搬送する搬送面を有するコンベアと、
    　前記コンベアの搬送面に沿って搬送方向に延びていて、前記コンベアの搬送面上で搬送される前記パレットをガイドするガイド部と、
    　前記パレットを前記搬送面上の所定位置で停止させるストッパと、
    を有し、
    　前記パレットは、
    　前記ストッパに接触する接触部と、
    　前記接触部が前記ストッパに接触した後に、前記パレットに対して搬送方向に減衰力を生じる減衰部と、
    を有する、パレット搬送システム。     A pallet with a pallet body on which the transported object can be placed, and
    A conveyor having a transport surface for transporting the pallet, and a conveyor.
    A guide portion extending in the transport direction along the transport surface of the conveyor and guiding the pallet to be transported on the transport surface of the conveyor, and a guide portion.
    A stopper that stops the pallet at a predetermined position on the transport surface,
    Have,
    The pallet is
    The contact part that comes into contact with the stopper and
    A damping portion that generates a damping force in the transport direction with respect to the pallet after the contact portion comes into contact with the stopper.
    Has a pallet transfer system.
  2. 　請求項１に記載のパレット搬送システムにおいて、
    　前記ガイド部は、前記搬送面を上から見て、前記搬送面上に位置する前記パレットとの間に、前記パレットが搬送方向に対して斜めに傾くのを許容する所定の隙間を有し、
    　前記減衰部は、搬送方向に対して前記パレットが斜めに傾いた状態で前記ガイド部と接触する部分を含む、パレット搬送システム。     In the pallet transfer system according to claim 1,
    The guide portion has a predetermined gap between the guide portion and the pallet located on the transport surface when the transport surface is viewed from above, which allows the pallet to tilt obliquely with respect to the transport direction.
    The damping portion is a pallet transport system including a portion that comes into contact with the guide portion in a state where the pallet is tilted obliquely with respect to the transport direction.
  3. 　請求項１または２に記載のパレット搬送システムにおいて、
    　前記パレットは、
    　前記パレット本体の下部に位置し、前記コンベアの搬送面に平行な車軸を中心として回転可能な車輪と、
    　前記車輪の回転をロック又はロック解除する車輪ロック機構と、
    をさらに有し、
    　前記車輪ロック機構は、
    　前記接触部が前記ストッパに接触した状態では、前記車輪の回転のロックを解除させ、
    　前記接触部が前記ストッパに接触していない状態では、前記車輪の回転をロックさせる、パレット搬送システム。     In the pallet transfer system according to claim 1 or 2.
    The pallet is
    Wheels that are located at the bottom of the pallet body and can rotate around an axle parallel to the conveyor surface,
    A wheel lock mechanism that locks or unlocks the rotation of the wheel,
    Have more
    The wheel lock mechanism is
    When the contact portion is in contact with the stopper, the rotation of the wheel is unlocked.
    A pallet transfer system that locks the rotation of the wheels when the contact portion is not in contact with the stopper.
  4. 　請求項１または２に記載のパレット搬送システムにおいて、
    　前記減衰部は、前記パレット本体の下部に位置する車輪を含み、
    　前記車輪は、前記コンベアの搬送面に平行な車軸を中心として回転可能で且つ鉛直方向に延びる鉛直軸を中心として回転可能である、パレット搬送システム。     In the pallet transfer system according to claim 1 or 2.
    The damping portion includes wheels located at the bottom of the pallet body.
    A pallet transport system in which the wheels are rotatable about an axle parallel to the transport surface of the conveyor and are rotatable about a vertical shaft extending in the vertical direction.
  5. 　請求項４に記載のパレット搬送システムにおいて、
    　前記パレットは、
    　前記車輪の回転をロック又はロック解除する車輪ロック機構をさらに有し、
    　前記車輪ロック機構は、
    　前記接触部が前記ストッパに接触した状態では、前記車輪の回転のロックを解除させ、
    　前記接触部が前記ストッパに接触していない状態では、前記車輪の回転をロックさせる、パレット搬送システム。     In the pallet transfer system according to claim 4,
    The pallet is
    It further has a wheel locking mechanism that locks or unlocks the rotation of the wheels.
    The wheel lock mechanism is
    When the contact portion is in contact with the stopper, the rotation of the wheel is unlocked.
    A pallet transfer system that locks the rotation of the wheels when the contact portion is not in contact with the stopper.
  6. 　請求項３または５に記載のパレット搬送システムにおいて、
    　前記車輪ロック機構は、
    　前記車輪に接触することで前記車輪の回転を停止させるロック部と、
    　前記ロック部を、前記車輪に接触する第１位置に付勢する付勢部と、
    を有し、
    　前記接触部は、前記ストッパに接触した状態では、前記付勢部の付勢力に抗して、前記ロック部を、前記車輪から離間した第２位置に位置付ける、パレット搬送システム。     In the pallet transfer system according to claim 3 or 5.
    The wheel lock mechanism is
    A lock portion that stops the rotation of the wheel by contacting the wheel,
    An urging portion that urges the lock portion to a first position in contact with the wheel, and a urging portion.
    Have,
    A pallet transfer system in which the contact portion, when in contact with the stopper, positions the lock portion at a second position away from the wheel against the urging force of the urging portion.
  7. 　請求項６に記載のパレット搬送システムにおいて、
    　前記車輪は、前記パレットの搬送方向に並ぶ複数の車輪を含み、
    　前記ロック部は、前記複数の車輪にそれぞれ接触する複数のロック部を含み、
    　前記付勢部は、前記複数のロック部を、前記複数の車輪に接触する第１位置に付勢し、
    　前記接触部は、前記ストッパに接触した状態では、前記付勢部の付勢力に抗して、前記複数のロック部を、前記車輪から離間した第２位置に位置付ける、パレット搬送システム。     In the pallet transfer system according to claim 6,
    The wheels include a plurality of wheels arranged in the transport direction of the pallet.
    The lock portion includes a plurality of lock portions that come into contact with the plurality of wheels, respectively.
    The urging portion urges the plurality of lock portions to a first position in contact with the plurality of wheels.
    The contact portion is a pallet transport system that, when in contact with the stopper, positions the plurality of lock portions at a second position away from the wheels against the urging force of the urging portion.
  8. 　請求項１から７のいずれか一つに記載のパレット搬送システムにおいて、
    　前記接触部は、前記パレット本体から搬送方向に突出する突起部を含む、パレット搬送システム。     In the pallet transfer system according to any one of claims 1 to 7.
    The contact portion is a pallet transport system including a protrusion protruding from the pallet body in the transport direction.
  9. 　請求項１から７のいずれか一つに記載のパレット搬送システムにおいて、
    　前記接触部は、前記パレット本体から搬送方向に突出する複数の突起部を含み、
    　前記複数の突起部のうち少なくとも２つの突起部は、搬送方向の突出長さが異なる、パレット搬送システム。     In the pallet transfer system according to any one of claims 1 to 7.
    The contact portion includes a plurality of protrusions protruding from the pallet body in the transport direction.
    A pallet transport system in which at least two of the plurality of protrusions have different protrusion lengths in the transport direction.
  10. 　搬送物を載置可能なパレット本体を有し、コンベアの搬送面上で搬送されるパレットであって、
    　前記パレット本体の下部に位置し、車軸を中心として回転可能な車輪と、
    　前記車輪の回転をロック又はロック解除する車輪ロック機構と、
    を有し、
    　前記車輪ロック機構は、
    　前記パレットの搬送方向に延びる支持軸と、
    　前記支持軸に固定され、前記車輪に接触することで前記車輪の回転を停止させるロック部と、
    　前記支持軸及び前記ロック部を、前記ロック部が前記車輪に接触する第１位置に付勢する付勢部と、
    を有し、
    　前記支持軸は、前記パレット本体から搬送方向に突出している、パレット。     A pallet that has a pallet body on which a transported object can be placed and is transported on the transport surface of a conveyor.
    Wheels that are located at the bottom of the pallet body and can rotate around the axle,
    A wheel lock mechanism that locks or unlocks the rotation of the wheel,
    Have,
    The wheel lock mechanism is
    A support shaft extending in the transport direction of the pallet and
    A lock portion that is fixed to the support shaft and stops the rotation of the wheel by coming into contact with the wheel.
    An urging portion that urges the support shaft and the locking portion to a first position where the locking portion contacts the wheel, and
    Have,
    The support shaft is a pallet that protrudes from the pallet body in the transport direction.
  11. 　請求項１０に記載のパレットにおいて、
    　前記車輪は、前記パレットの搬送方向に並ぶ複数の車輪を含み、
    　前記ロック部は、前記複数の車輪にそれぞれ接触する複数のロック部を含み、
    　前記支持軸には、前記複数のロック部が固定され、
    　前記付勢部は、前記複数のロック部を、前記複数の車輪に接触する第１位置に付勢する、パレット。     In the pallet according to claim 10,
    The wheels include a plurality of wheels arranged in the transport direction of the pallet.
    The lock portion includes a plurality of lock portions that come into contact with the plurality of wheels, respectively.
    The plurality of lock portions are fixed to the support shaft, and the plurality of lock portions are fixed to the support shaft.
    The urging portion is a pallet that urges the plurality of lock portions to a first position in contact with the plurality of wheels.
PCT/JP2020/047555 2020-06-23 2020-12-18 Pallet transport system, and pallet WO2021260976A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642254Y2 (en) * 1977-07-19 1981-10-02
JPS5873466A (en) * 1981-10-28 1983-05-02 株式会社村田製作所 Work transporter
JPS6115230U (en) * 1984-07-03 1986-01-29 パイオニア株式会社 Transported object deceleration mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5642254Y2 (en) * 1977-07-19 1981-10-02
JPS5873466A (en) * 1981-10-28 1983-05-02 株式会社村田製作所 Work transporter
JPS6115230U (en) * 1984-07-03 1986-01-29 パイオニア株式会社 Transported object deceleration mechanism

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