JP5114321B2 - Conveyor using trolley - Google Patents

Description

  The present invention relates to a carriage using a carriage that propels the carriage by rotation driving of a screw shaft provided on the traveling path side of the carriage.

As described in Patent Document 1 and the like, the carriage using the carriage as described above has a screw shaft that is rotationally driven arranged along a travel path of the carriage, and the carriage has a spiral blade of the screw shaft. A driven roller fitted between them is provided, and the carriage is driven by the rotational drive of the screw shaft, and the driven roller on the side of the carriage is driven by the spiral wing of the screw shaft. It is configured to boost in the direction. In this configuration, the driven roller on the conveyance carriage side can move freely between the spiral blades of the screw shaft in the axial direction of the screw shaft, so that the traveling conveyance carriage may swing back and forth due to vibration or the like. As a means for solving this problem, it is also known that the spiral blade of the screw shaft has a double blade structure in which the driven roller on the conveying carriage side is sandwiched from both sides in the axial direction of the screw shaft.
Japanese Patent Laid-Open No. 9-58463 JP 2001-106462 A

  However, even when the screw shaft spiral blade has a double blade structure, an appropriate gap (play) is required between the driven roller on the conveyance carriage side and the spiral blade sandwiching the driven roller, and this clearance is necessary. Even if the screw shaft can be manufactured with high precision so as to be minimized, the presence or absence of the necessary minimum gap cannot completely eliminate the play (backlash) in the longitudinal direction of the traveling carriage. Therefore, when the transport device configured as described above is used as a work transport device in a painting line that automatically coats the work on the transport cart with a coating machine, the transport cart (work) may rattle back and forth due to vibration. May cause uneven paint.

  An object of the present invention is to provide a carriage-use transfer apparatus that can solve the above-described conventional problems, and the carriage-use transfer apparatus according to claim 1 is an embodiment described later. The screw shaft 1 that is rotationally driven is arranged along the travel path of the transport carriage 2, and the transport carriage 2 is fitted between the spiral blades 1 a and 1 b of the screw shaft 1. In the transport device using a carriage provided with a driven roller 5 and configured to propel the transport carriage 2 by the rotational drive of the screw shaft 1, the transport carriage 2 includes two spiral blades in the axial direction of the screw shaft. A pair of front and rear driven rollers 5 and 6 fitted between 1a and 1b are pivotally supported, one driven roller is a position-fixed driven roller 5, and the other driven roller is a screw shaft. The movable driven roller 6 is movably supported within a certain range in the direction, and is provided with an urging means 20 for urging the movable driven roller 6 in one direction of the moving direction, and a pair of front and rear driven rollers 5,5. 6 is configured to determine the position of the transport carriage 2 with respect to the screw shaft 1 by being in pressure contact with the spiral blades 1a and 1b of the screw shaft 1 located on one side of the driven rollers 5 and 6 in opposite directions. .

  When carrying out the transport device of the present invention, when the travel path length of the transport carriage 2 is short, the entire length of the transport carriage travel path can be covered with one screw shaft 1. When the length is long, a plurality of screw shafts 1 need to be concentrically arranged in series and linked to each other. In this case, bearings 12 at both ends of the screw shaft 1 and transmission means 8 and 9 between the screw shafts 1 must be arranged between the screw shafts 1. 13 is required. When the present invention is carried out in such a situation, as described in claim 2, the screw shaft 1 is separated by a gap 13 having a length not wider than the distance between the pair of front and rear driven rollers 5 and 6. A plurality of concentric series are arranged in series, and a pair of front and rear driven rollers 5 and 6 are fitted between the spiral blades 1a and 1b of one screw shaft 1 to each of the movable driven rollers 6. A holding means 21 for positioning the movable driven roller 6 at a position when the blades 1a and 1b are in pressure contact with each other (predetermined operation position) is provided. Switching the holding means 21 from the non-positioning state to the positioning state on the upper side of the portion 13 and switching the holding means 21 from the positioning state to the non-positioning state on the lower side of the gap portion 13. The means 26 is also provided, and the movable driven roller 6 is positioned by the holding means 21 while the pair of front and rear driven rollers 5 and 6 move from the upper side to the lower side of the gap 13 between the screw shafts 1. can do.

  Further, when adopting the configuration described in claim 2, specifically, as described in claim 3, the movable driven roller 6 is supported so as to be movable within a certain range in the axial direction of the screw shaft. The urging means 20 comprises a spring 22 that is pivotally supported on the movable body 18 and urges the movable body 18 in one direction, and the holding means 21 is a locked portion provided on the transport carriage 2 side. 25, and a locking tool 24 that is pivotally supported by the movable body 18 so as to be freely disengageable with respect to the locked portion 25 and is urged and held in a non-positioning state that is disengaged from the locked portion 25. The switching means 26 is configured by providing a cam rail 27 on the traveling path side of the transport carriage 2 so as to act on a cam driven roller 28 provided on the locking tool 24, and a pair of front and rear driven rollers 5, 6. Of the gap 13 between the screw shafts 1 While possess from the hand side to the downstream side, the cam rail 27 can be configured to hold the positioned state to engage the fastener 24 in the engaged portion 25 via a cam follower roller 28.

  According to the structure of the said Claim 1, a pair of front and back driven roller by the side of a conveyance trolley presses the spiral wing | blade of the screw shaft located in the one side of each driven roller to mutually opposite direction, and is conveyed with respect to a screw shaft. Since the position of the carriage is determined, the screw shaft is accurately manufactured so that the gap (play) between the driven roller on the conveyance carriage side and the spiral blade of the screw shaft sandwiching the driven roller is minimized. Despite the fact that it is no longer necessary and the manufacturing cost of the screw shaft can be reduced, the position of the transport carriage relative to the screw shaft is reliably positioned by the pressure contact between the position-fixed driven roller and the screw shaft spiral blade. It is possible to reliably prevent the transporting carriage from rattling due to vibrations before and after the traveling direction.Therefore, it can be sufficiently utilized for conveying workpieces on a painting line that could not utilize this type of conveying device.

  In addition, when a plurality of screw shafts must be concentrically arranged in series due to the long travel path length of the transport carriage, according to the configuration of claim 2, the arrangement of the screw shaft bearings and the screw When a pair of front and rear driven rollers pass through the gap while securing a gap required between the screw shafts for the arrangement of transmission means between the shafts, for example, the position-fixed driven roller passes through the gap. Sometimes, the conveying carriage moves with respect to the movable driven roller by the biasing force of the biasing means for biasing the movable driven roller, and the interval between the fixed position driven roller and the movable driven roller changes, or the movable driven roller When the movable driven roller moves in the urging direction by the urging force of the urging means and moves with the position-fixed driven roller. It eliminates things like spacing changes in a moving roller, it is possible to smoothly and reliably fitted between the helical blade of the downstream side of the screw shaft of the gap portion of the front and rear pair of driven rollers. That is, the transfer between the screw shafts can be smoothly and reliably performed while adopting the configuration of the first aspect. The present invention described in claim 2 can be easily implemented by adopting the configuration described in claim 3.

  FIG. 1 and FIG. 2 are diagrams showing a part of a transport facility constructed by using a screw shaft 1 for driving a transport cart. The transport cart 2 driven by the screw shaft 1 includes a pair of left and right guide rails. 3a and 3b, a pair of front and rear wrinkleless wheels 4a rolling on one guide rail 3a, and a pair of front and rear wrinkles rolling on the other guide rail 3b and sandwiching the guide rail 3b from both left and right sides Wheel 4b. The required number of screw shafts 1 are arranged in a concentric series parallel to the guide rails 3a and 3b at the middle position between the pair of left and right guide rails 3a and 3b. A pair of front and rear driven rollers 5 and 6 capable of rotating around a vertical spindle at a position where the blades are loosely fitted are provided. The screw shaft 1 includes spiral blades 1a and 1b configured in a double blade type in which the driven rollers 5 and 6 are sandwiched from both sides in the axial direction of the screw shaft.

  The ends of the screw shafts 1 that are concentrically adjacent to each other are arranged at the same speed and in the same direction through the relay shaft 7 supported on the lateral side thereof and the transmission means 8 and 9 using chains (or gears), respectively. A speed reducer that is interlocked and coupled so as to rotate in an interlocked manner and that rotationally drives the screw shaft 1 positioned at one end of the travel path of the transport carriage 2 in any direction, forward or reverse, via a transmission means 10 that uses a chain (or gear). An attached motor 11 is provided. Of course, the screw shaft 1 located at an appropriate intermediate position in the travel route of the transport carriage 2 or the relay shaft 7 interlocked with the screw shaft 1 may be driven by a motor with a speed reducer. Reference numeral 12 denotes a bearing that supports both ends of the screw shaft 1, and a gap 13 in which the bearing 12 and the transmission means 8 and 9 are arranged is secured between the screw shafts 1.

  Of the pair of front and rear driven rollers 5 and 6, the forward driven roller 5 indicated by an arrow is a fixed position driven roller attached to a fixed position of the transport carriage 2, and the rear driven roller 6 is a screw shaft. 1 is a movable driven roller configured to be movable within a certain range in the axial direction of 1, and the distance between the driven rollers 5 and 6 when the movable driven roller 6 is closest to the position-fixed driven roller 5 is The distance between the screw shafts 1, that is, the length of the gap 13 is longer. Therefore, when the transport carriage 1 passes through the gap 13 between the screw shafts 1, both the pair of front and rear driven rollers 5 and 6 are located in the gap 13 and are disengaged from the screw shafts 1 on both sides thereof. Absent.

  Hereinafter, in more detail, as shown in FIGS. 3 to 5, a movable driven roller unit 14 is attached to the bottom of the transport carriage 1. The movable driven roller unit 14 includes a mounting plate 15 attached to the bottom of the transport carriage 1, a pair of front and rear bearing plates 16a and 16b attached to the mounting plate 15, and a screw shaft 1 between the bearing plates 16a and 16b. One guide shaft 17 installed in parallel, and a movable body that is supported by the guide shaft 17 so as to be slidable in the axial direction and is prevented from rotating around the guide shaft 17 adjacent to the mounting plate 15. 18. The movable driven roller 6 pivotally supported by the vertical support shaft 19 below the movable body 18 and the urging means 20 for urging the movable driven roller 6 away from the position-fixed driven roller 5. The holding means 21 is also provided. The urging means 20 is constituted by a compression coil spring 22 that is externally fitted to the guide shaft 17 between the movable body 18 and the bearing plate 16a and urges the movable body 18 in a direction away from the position-fixed driven roller 5. Yes.

  The holding means 21 includes a locking member 24 whose one end is pivotally supported by a horizontal support shaft 23 in a direction orthogonal to the screw shaft 1 on one side surface of the movable body 18, and one side of the bearing plate 16a. A hook portion 24a that protrudes sideways from the top and protrudes upward from the tip of the locking tool 24 is constituted by a locked portion 25 that is detachable. The locking device 24 includes a stopper portion 24b that protrudes upward from the end portion on the shaft support side. The locking device 24 that is urged and rotated downward by gravity, the hook portion 24a of which is the locked portion 25. The stopper portion 24b comes into contact with the bottom surface of the mounting plate 15 and is held in the non-positioning state when the non-positioning state is released downward from the stopper.

  As shown in FIGS. 1, 2, and 6 to 8, a switching means 26 is provided alongside the gap 13 between the screw shafts 1. The switching means 26 includes a cam rail 27 laid in parallel with the screw shaft 1 on the travel path side of the transport carriage 2, and the locking tool 24 rides on the cam rail 27 and rolls on the side of the distal end side. A cam driven roller 28 that passes through is pivotally supported. The switching means 26 and the holding means 21 provided along with the movable driven roller 6 are configured to perform the operations described below.

  In the above configuration, by operating the motor 11 with a speed reducer, all the screw shafts 1 linked to each other via the transmission means 8 and 9 can be linked and rotated in the same direction at the same speed. The screw shaft 1 drives and propels the transport carriage 2 in the feeding direction of the spiral blades 1a and 1b via the position-fixed driven roller 5 and the movable driven roller 6 fitted between the spiral blades 1a and 1b. Can do. At this time, the movable driven roller 6 is urged in the direction away from the position fixed driven roller 5 by the compression coil spring 22 of the urging means 20, so that the position fixed driven roller 5 and the movable driven are moved as shown in FIG. The rollers 6 are urged in directions away from each other by the urging force of the urging means 20 (compression coil spring 22), and the helical wings 1a and 1b of the screw shaft 1 sandwich the driven rollers 5 and 6 from the front and rear sides, respectively. Of these, the position-fixed driven roller 5 is in pressure contact with the front spiral blade 1a, and the movable driven roller 6 is in pressure contact with the rear spiral blade 1b. At this time, the strength of the urging force (strength of the compression coil spring 22) acting in the direction in which the driven rollers 5 and 6 are separated from each other is determined on the guide rails 3a and 3b of the transport carriage 2 with the workpiece mounted thereon. Greater than the running resistance. Accordingly, the position of the transport carriage 2 with respect to the screw shaft 1 is determined by the mutually opposite pressure contact between the driven rollers 5 and 6 and the spiral blades 1a and 1b of the screw shaft 1, and the transport carriage 2 is On the other hand, there is no play in the axial direction. Further, the locking tool 24 of the holding means 21 is held in a non-positioning state in which the locking tool 24 swings downward to the swing limit due to gravity, and the hook portion 24a of the locking tool 24 moves downward from the locked portion 25. It is in a disconnected state.

  The conveyance carriage 2 travels in the forward direction by the rotational drive of the screw shaft 1, and as shown in FIG. 6, the front position fixed driven roller 5 is located immediately before the gap portion 13 between the screw shafts 1, that is, the gap portion 13. When the terminal position of the upper screw shaft 1 is reached, on the cam rail 27 of the switching means 26 provided in the gap 13, the holding means 21 (engaged in the rear movable follower roller 6) The cam follower roller 28 of the stopper 24) rides on as the transport carriage 2 travels, the locking tool 24 is pushed up from the non-positioning state against gravity, and the hook portion 24a is engaged with the locked portion 25. The locking tool 24 is switched to the matching positioning state. At this time, there is a slight gap between the hook portion 24 a and the locked portion 25, and the locking tool 24 is reliably switched to the positioning state without interfering with the locked portion 25.

  If the position fixing driven roller 5 on the front side is disengaged from the terminal end of the screw shaft 1 on the upper side of the gap portion 13 due to the traveling of the transport carriage 2, the restriction by the spiral blade 1a of the screw shaft 1 on the position fixing driven roller 5 is released. Therefore, the transport carriage 2 is moved forward by the biasing force of the biasing means 20 (compression coil spring 22) by a slight gap between the hook portion 24a and the locked portion 25 in the locking member 24 of the holding means 21. Then, the hook 24a and the locked portion 25 of the locking tool 24 come into contact with each other, and the movable driven roller 6 (movable body 18) is fixed in position by the biasing force of the biasing means 20 (compression coil spring 22). The movement away from 5 (rearward) is prevented by the engagement between the hook portion 24a of the locking device 24 and the locked portion 25 which are switched to the positioning state. That. That is, the position of the movable driven roller 6 is substantially fixed with respect to the transport carriage 2, and when the movable follower roller 6 is pushed back by the spiral blade 1b of the screw shaft 1, the transport carriage 2 moves forward. Will continue.

  Further, as the forward traveling of the transport carriage 2 progresses, the front-side position-fixed driven roller 5 that has moved in the gap portion 13 is moved to the spiral blade 1a of the screw shaft 1 on the lower side of the gap portion 13 as shown in FIG. , 1b, the rear movable follower roller 6 has reached the vicinity of the terminal end of the screw shaft 1 on the upper side of the gap 13 and thereafter the front position fixed follower roller 5 is reached. Is pulled by the spiral blade 1b of the screw shaft 1 on the lower side of the gap portion 13 and the movable follower roller 6 on the rear side is pushed into the gap portion 13 by the spiral blade 1b of the screw shaft 1 on the upper side of the gap portion 13. . After that, the front position-fixed driven roller 5 receives the thrust in the forward direction by the spiral blades 1a and 1b of the screw shaft 1 on the lower side of the gap 13 so that the transport carriage 2 continues traveling forward.

  The movable movable roller 6 on the rear side that moves in the gap portion 13 is fitted between the spiral blades 1a and 1b of the screw shaft 1 on the upper side of the gap portion 13 together with the front position-fixed driven roller 5 and biasing means 20. The desired action position when the helical blades 1a and 1b are pressed against each other in the opposite directions by the urging force of the (compression coil spring 22) (actually, between the hook portion 24a and the locked portion 25 in the locking tool 24). It is held by a locking tool 24 that is switched to the positioning state of the holding means 21 at a position shifted backward from the position-fixed driven roller 5 by a slight gap. Therefore, the forward traveling of the transport carriage 2 further proceeds, and the movable movable roller 6 on the rear side that has moved in the gap portion 13 has a spiral of the screw shaft 1 on the lower side of the gap portion 13 as shown in FIG. When reaching the position to be introduced between the blades 1a, 1b, the movable driven roller 6 is slightly against the biasing force of the biasing means 20 (compression coil spring 22) by the spiral blade 1b of the screw shaft 1. It is smoothly and reliably introduced between the spiral blades 1a and 1b of the screw shaft 1 while being pulled forward.

  As described above, both of the pair of front and rear driven rollers 5 and 6 move between the spiral blades 1a and 1b of the screw shaft 1 on the lower side of the gap portion 13, and the screw carriage 1 causes the transport carriage 2 to return to the intended action again. When the propulsion state is reached, the cam follower roller 28 on the side of the locking tool 24 comes off from the cam rail 27, and at this time, between the hook part 24 a and the locked part 25 of the locking tool 24 in the positioning state. Since a slight gap is generated again, the locking member 24 is surely swung downward by gravity and returns to the original non-positioning state.

  As described above, the transport carriage 2 is continuously propelled by the screw shaft 1 that is concentrically arranged in series and is rotationally driven in the same direction at a constant speed, and travels on the travel route at a predetermined speed. However, only while the pair of front and rear driven rollers 5 and 6 pass through the gap 13 between the screw shafts 1 from the upper side to the lower side, the position of the transport carriage 2 is positioned at the position-fixed driven roller 5 or the intended operation position. The thrust is received only by the movable follower roller 6 that is provided.

  The travel route of the transport carriage 2 is provided with a turntable that feeds the transport cart 2 laterally between the forward and backward routes provided with the screw shaft 1 and the end start ends of both routes and reverses the front-rear direction. When the traverser forms a rectangular endless circulation path, the traveling direction of the transport carriage 2 on each screw shaft 1 can be made constant, but the transport carriage 2 travels back and forth on one straight path. In order to do this, the screw shaft 1 may be rotated forward and backward. Also in this case, in consideration of the positions of both ends of the cam rail 27 of the switching means 26, the movable means is driven by the holding means 21 while the pair of front and rear driven rollers move from the upper side to the lower side of the gap 13 between the screw shafts 1. What is necessary is just to comprise so that the roller 6 may be positioned in the said intended operation position. In other words, the positional relationship between the front and rear positions of the position-fixed driven roller 5 and the movable driven roller 6 can be reversed from that in the above embodiment.

  In addition, this type of carriage-based transfer device changes the pitch of the spiral blades 1a and 1b of the screw shaft 1, that is, the feed pitch, so that the rotational speed of the screw shaft 1 remains constant and the carriage 2 travels. You can change the speed. Therefore, the conveyance carriage drive path constituted by a plurality of screw shafts 1 arranged concentrically in series and interlockingly connected to each other is divided into a plurality of areas where the feed pitches of the screw shafts 1 are different, and the conveyance carriage 2 is divided into areas. It may be desired to change the traveling speed of the vehicle. In such a case, although the feed pitch is different, the distance between the pair of front and rear driven rollers 5 and 6 (the distance when the movable driven roller 6 is in the intended operation position) is configured to be substantially constant. In the front and rear of the gap 13 between the screw shafts 1, the feed pitch is configured to be the same, and when the driven roller is transferred between regions having different feed pitches on one screw shaft 1, The distance between the following driven rollers 5 and 6 varies, and the variation in the distance between the pair of front and rear driven rollers 5 and 6 is absorbed by the movement of the movable driven roller 6 in the axial direction of the screw shaft. Just do it.

  Note that the configuration of the holding means 21 for positioning the movable driven roller 6 at the intended action position and the configuration of the switching means 26 are not limited to those shown in the above embodiment. In the above embodiment, the movable driven roller 6 is urged by the urging means 20 in a direction away from the fixed position driven roller 5. However, the movable driven roller 6 is urged in a direction to approach the fixed position driven roller 5. It is also possible to configure. In this case, the pair of front and rear driven rollers 5 and 6 are brought into pressure contact with the spiral blades 1b and 1a located inside thereof by the biasing force of the biasing means. Further, the latch 24 constituting the holding means 21 is configured to be biased and held in the non-positioned state by gravity. However, the latch 24 is biased and held in the non-positioned state by the biasing force of the spring. It can also be configured.

  Further, the screw shaft in the carriage-use conveyance device of the present invention can be used as a means for driving and propelling the carriage carriage of the carriage-type conveyor that runs on the guide rail laid on the floor surface. It can also be utilized as a means for driving and propelling a transport carriage of an overhead conveyor that is supported by a guide rail installed at an appropriate height. In addition, the position of the screw shaft with respect to the transport cart is not limited to the lower side of the transport cart, and can be arbitrarily determined depending on the support structure of the transport cart, the load loading structure, etc. Can be set. Further, the position-fixed driven roller and the movable driven roller can also be axially supported so that the axial center thereof is not in the vertical direction but in the horizontal direction. Therefore, in the case of the embodiment in which the latching tool 24 is employed as the holding means, the moving direction of the latching tool 24 is not the vertical direction but the horizontal direction, and the spring can be provided as the biasing means.

It is a schematic plan view of the principal part explaining the structure of a conveying apparatus. It is a schematic side view of the principal part. Fig. A is a side view of the main part showing a state when driving and propelling the transport carriage on one screw shaft, and Fig. B is a cross-sectional plan view of the main part. FIG. 3B is an enlarged left side view of FIG. 3A. It is a cross-sectional top view of a movable driven roller unit. It is a partial notched side view of the principal part which shows the state immediately before passing the space | gap part between screw shafts. It is a partially notched side view of the principal part which shows the state in passing the space | gap part between screw shafts. It is a partial notch side view of the principal part which shows the state immediately after passing the space | gap part between screw shafts.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw shaft 1a, 1b Spiral wing 2 Carriage cart 5 Position fixed driven roller 6 Movable driven roller 7 Relay shaft 8-10 Transmission means 11 Motor 12 with a reduction gear 12 Bearing 13 Space | gap part 17 between screw shafts Guide shaft 18 Movable body Biasing means 21 Holding means 22 Compression coil spring 24 Locking tool 25 Locked portion 26 Switching means 27 Cam rail 28 Cam driven roller

Claims (3)

  A screw shaft that is rotationally driven is disposed along the travel path of the conveyance carriage, and the conveyance carriage is provided with a driven roller that fits between the spiral blades of the screw shaft, and the conveyance carriage is propelled by the rotational drive of the screw shaft. In the conveying device using the carriage configured as described above, the conveying carriage is supported by a pair of front and rear driven rollers that are fitted between two spiral blades in the axial direction of the screw shaft, and one of the driven rollers is positioned. It is a fixed driven roller, and the other driven roller is a movable driven roller that is supported so as to be movable within a certain range in the axial direction of the screw shaft, and urges the movable driven roller to bias in one direction of the moving direction. Means, and a pair of front and rear driven rollers are mutually connected to the spiral wing of the screw shaft located on one side of each driven roller. By pressing in the opposite direction, the position of the transport carriage with respect to the screw shaft is configured to be determined, the transport system of the truck use.   A plurality of screw shafts are concentrically arranged in series with a gap not longer than the distance between the pair of front and rear driven rollers, and the movable driven roller has one pair of front and rear driven rollers. Holding means for positioning the movable follower roller at a position when it is fitted between the spiral wings of the screw shaft and is in pressure contact with each one of the spiral wings, A switching means for switching the holding means from the non-positioning state to the positioning state on the upper side of the gap and for returning the holding means from the positioning state to the non-positioning state on the lower side of the gap is provided. Is moved by the holding means while the gap between the screw shafts moves from the upper side to the lower side. Configured urchin, conveying apparatus of the truck use according to claim 1.   The movable driven roller is pivotally supported by a movable body that is movably supported within a certain range in the axial direction of the screw shaft, and the biasing means is configured by a spring that biases the movable body in one direction, The holding means is attached to a locked portion provided on the transport carriage side, and a non-positioning state that is pivotally supported by the movable body so as to be freely disengaged from the locked portion and is disengaged from the locked portion. The switching means includes a cam rail provided on the traveling path side of the transport carriage so as to act on a cam driven roller provided in the locking tool, and a pair of front and rear While the driven roller moves from the upper side to the lower side of the gap portion between the screw shafts, the cam rail is configured to hold the locking tool in a positioning state to engage the locked portion via the cam driven roller. Claim Conveying apparatus of the truck uses described.

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