CN115697866A - Tray and tray conveying system - Google Patents

Abstract

The invention provides a pallet and a pallet conveying system, which can decelerate other pallets even if the other pallets are located at positions connected with the front and the back of the conveying direction. The tray (7) is a tray that has a mounting table on which a conveyed article (M) can be mounted and that is conveyed by the conveyor belt (2). The tray (7) has a contact portion (7 b) that contacts the reduction gear (3) that reduces the speed of the tray (7), and an insertion portion (7 e) into which the reduction gear (3) is inserted. The insertion section (7 e) is positioned at least one of the front end section in the conveying direction of the contact section (7 b) and the rear end section in the conveying direction of the tray main body section (7 a) having the placement table.

Description

Tray and tray conveying system

Technical Field

The invention relates to a pallet and a pallet conveying system.

Background

There is known a tray which has a mounting table on which a conveyed object can be mounted and which is conveyed by a conveyor belt. The tray is stopped by a stopper or the like when being conveyed to a predetermined position by the conveyor belt. In such a tray, a tray is disclosed which suppresses an impact at the time of contact with a stopper or the like and prevents rebounding from the stopper. For example, patent document 1 discloses a deceleration stop device for a pallet, including: a tray, the inclined part of which and the positioning concave part are adjacently positioned at the front part of the advancing direction; and a stop registration roller configured to be swingable in a direction parallel to the conveying surface of the conveyor belt. The stop registration roller is biased in a swinging direction by an elastic body.

In the deceleration stop device for a tray described in patent document 1, the stop registration roller is brought into contact with the inclined portion at a predetermined position on the conveyor belt of the tray. When the tray moves in the traveling direction by the conveyor belt, the stopper registration roller is swung by the inclined portion. The conveyor belt is decelerated by the urging force of the stop registration roller. When the tray is further moved in the traveling direction by the conveyor belt, the stop registration roller engages with the registration recess. Thus, the tray is decelerated and stopped by the stop registration roller.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2000-69723

Disclosure of Invention

Technical problem to be solved by the invention

However, in the deceleration stop device disclosed in patent document 1, the stop registration roller is brought into contact with the inclined portion of the tray from the front of the tray in a state of protruding from the conveying surface of the conveyor belt. That is, in the deceleration stop device, when the tray is decelerated and stopped, the stop registration roller is positioned in front of the tray and above the conveying surface of the conveyor belt. Therefore, in the deceleration stop device, when another tray is located at a position in front of and behind the decelerated tray, the stop registration roller cannot be arranged at a position in front of the decelerated tray and above the conveying surface of the conveyor belt.

The invention aims to provide a tray and a tray conveying system, which can decelerate other trays even if the other trays are positioned at the front and back of the conveying direction.

Means for solving the problems

A tray according to an embodiment of the present invention is a tray that includes a mounting table on which a conveying object can be mounted and that is conveyed by a conveyor belt. The tray includes a contact portion that comes into contact with a speed reduction device that reduces the speed of the tray, and an insertion portion into which the speed reduction device is inserted, the insertion portion being located at least one of a front end portion of the contact portion in a conveying direction and a rear end portion of the mounting table in the conveying direction.

A tray conveying system according to an embodiment of the present invention includes: a tray having a placing table on which a transported object can be placed; a conveyor belt having a conveying surface for conveying the tray; a deceleration portion in contact with the tray; and a biasing portion that biases the decelerating portion toward the tray. The tray includes a contact portion that contacts the decelerating portion, and an insertion portion into which the decelerating portion is inserted, the insertion portion being located at least one of a front end portion of the front contact portion in the conveying direction and a rear end portion of the mounting table in the conveying direction.

Effects of the invention

According to the pallet and the pallet conveying system according to the embodiment of the present invention, even if another pallet is located at a position in tandem with the front and rear in the conveying direction, the other pallet can be decelerated.

Drawings

Fig. 1 is a diagram showing a schematic configuration of a tray conveying system according to embodiment 1 of the present invention.

Fig. 2 is a side view showing a schematic configuration of a tray according to embodiment 1 of the present invention.

Fig. 3 is a plan view showing a schematic configuration of a tray according to embodiment 1 of the present invention.

Fig. 4 is a side view showing a state in which a tray is located at a working position and a standby position in the tray conveying system according to embodiment 1 of the present invention.

Fig. 5 is a side view showing a state where a tray is carried out from a working position in the tray conveying system according to embodiment 1 of the present invention.

Fig. 6 is a side view showing a state where a tray is conveyed from a working position to a working position in the tray conveying system according to embodiment 1 of the present invention.

Fig. 7 is a side view showing a state in which the arrangement of the trays is completed at the working position and the standby position in the tray conveying system according to embodiment 1 of the present invention.

Fig. 8 is a diagram showing a control flow of the first stopper and the second stopper in the tray conveying system according to embodiment 1 of the present invention.

Fig. 9 is a side view showing a state of a force applied to the tray 7 when the tray 7 of embodiment 1 of the present invention comes into contact with the reduction gear.

Fig. 10 is a side view showing a schematic configuration of the tray 9 of the tray conveying system according to embodiment 2 of the present invention.

Fig. 11 is a side view showing a schematic configuration of a tray 10 of the tray conveying system according to embodiment 3 of the present invention.

Fig. 12 is a plan view showing another embodiment of the tray in the tray conveying system of the present invention.

Fig. 13 is a side view showing a schematic configuration of a tray conveying system according to embodiment 4 of the present invention.

Fig. 14 is a side view showing a schematic configuration of a tray conveying system according to embodiment 5.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. The dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components, the dimensional ratios of the components, and the like.

In the following description, the conveying direction of the tray 7 (outlined arrow in fig. 1) is referred to as "front" or "downstream side in the conveying direction", and the direction opposite to the conveying direction of the tray 7 is referred to as "rear" or "upstream side in the conveying direction". In addition, the left side with respect to the conveying direction is referred to as "left direction" and the right side with respect to the conveying direction is referred to as "right direction" as viewed from the conveyed article M on the tray 7.

In the following description, expressions such as "fixed", "connected", and "attached" (hereinafter, fixed and the like) include not only a case where components are directly fixed to each other and the like but also a case where components are fixed via other components and the like. In other words, in the following description, expressions such as fixing include meanings such as direct and indirect fixing of members.

[ embodiment 1]

(tray conveying System 1)

Fig. 1 is a diagram showing a schematic configuration of a tray conveying system 1 according to embodiment 1 of the present invention. Fig. 2 is a side view showing a schematic configuration of the tray 7 according to embodiment 1 of the present invention. Fig. 3 is a plan view showing a schematic configuration of the tray 7 according to embodiment 1 of the present invention. The tray conveying system 1 is a system for conveying a tray 7 on which a conveyed material M is placed by a conveyor 2. The tray conveying system 1 is used for, for example, an inspection device for inspecting the conveyed material M, a processing device for processing the conveyed material M, and the like.

The tray conveying system 1 includes a conveyor 2, a speed reducer 3, a first stopper 4, a second stopper 5, a tray pressing portion 6, a plurality of trays 7, and a controller 8.

The conveyor 2 can be moved in one direction by a drive mechanism not shown. The conveyor belt 2 is, for example, an endless belt-shaped conveyor belt. The upper surface of the conveyor belt 2 serves as a conveying surface 2a for conveying the plurality of trays 7. The conveyor 2 includes a plurality of conveyors. The plurality of conveyor belts of the conveyor belt 2 are arranged in parallel at a wide predetermined interval.

The speed reducer 3 is a device for reducing the speed of the tray 7. The speed reducer 3 includes a speed reducer portion 3a that contacts the tray 7, and a biasing portion 3b that biases the speed reducer portion 3a in the direction of the tray 7. The speed reduction device 3 is located below the conveying surface 2a of the conveyor belt 2 at least one position in the width direction of the conveyor belt 2. The reduction gear 3 may be provided at a plurality of positions in parallel in the width direction of the conveyor 2.

The speed reducer 3a is composed of, for example, a cylindrical roller rotatably supported and a support member. The decelerating section 3a is located below the conveyor belt 2 with the roller facing upward. The rotation direction of the rollers in the decelerating section 3a is the same as the conveying direction of the conveyor belt 2. The decelerating section 3a is configured to be movable in a direction perpendicular to the conveying direction of the tray 7. In the present embodiment, the decelerating section 3a is configured to be movable in a direction perpendicular to the conveying direction of the tray 7 and in a direction perpendicular to the conveying surface 2a of the conveyor 2. The decelerating section 3a moves from a lower limit position where it does not protrude from the conveying surface 2a of the conveyor 2 to an upper limit position where it protrudes from the conveying surface 2a of the conveyor 2. The decelerating section 3a is located at a position where it can move in the vertical direction between the conveyor belts constituting the conveyor belt 2. That is, the decelerating section 3a protrudes upward from the substantially center of the conveyor belt 2 in the width direction than the conveying surface 2a at the upper limit position.

The biasing portion 3b is formed of, for example, a compression spring. The biasing portion 3b biases the decelerating portion 3a in the direction of the conveying surface 2a of the conveyor belt. In the present embodiment, the biasing portion 3b biases in a direction perpendicular to the conveying direction of the tray 7 and in a direction perpendicular to the conveying surface 2a of the conveyor belt 2. Thereby, the decelerating portion 3a is maintained at the upper limit position protruding upward from the conveying surface 2a of the conveyor belt 2 by the biasing force of the biasing portion 3b. When the decelerating section 3a is pressed against the conveying surface 2a of the conveyor 2, it moves toward the conveying surface 2a of the conveyor 2.

The first stopper 4 is a member for stopping the tray 7 placed on the conveyor belt 2 with respect to the conveyor belt 2. The first stopper 4 stops the tray 7 at the working position Ws on the conveyor belt 2. The work position Ws is a position where work such as processing, assembly, and inspection is performed on the conveyed material M placed on the tray 7. The first stopper 4 is moved up and down at a predetermined position of the conveyor 2 by a drive mechanism not shown. The first stopper 4 is lowered relative to the conveyor belt 2 to a work stop position SP1 at which the tray 7 is stopped at the work position Ws, and is raised to a work release position RP1 at which the movement of the tray 7 is not hindered when the movement of the tray 7 from the work position Ws is permitted.

The second stopper 5 is a member for stopping the tray 7 placed on the conveyor belt 2 with respect to the conveyor belt 2. The second stopper 5 is located upstream of the first stopper 4. The second stopper 5 stops the tray 7 at a standby position Ss on the conveyor belt 2. The standby position Ss is a position at which the upstream tray 7 is caused to stand by on the conveyor 2 until the job at the job position Ws is completed. The second stopper 5 is moved up and down at a predetermined position of the conveyor 2 by a drive mechanism not shown. The stopper 5 is lowered relative to the conveyor 2 to a standby stop position SP2 at which the tray 7 is stopped at the standby position Ss, and is raised to a standby release position RP2 at which the movement of the tray 7 is not hindered when the tray 7 is allowed to move from the standby position Ss.

The tray pressing portion 6 prevents the tray 7 placed on the conveyor belt 2 from being lifted by the reduction gear 3. The tray pressing portion 6 is located above the conveying surface 2a of the conveyor belt 2. The tray pressing portion 6 has a pressing roller at a position facing the conveying surface 2a of the conveyor belt 2, for example. The rotation direction of the pressing roller of the tray pressing portion 6 is the same as the conveying direction of the conveyor belt 2. Further, the tray pressing portion 6 is located at a position facing the speed reduction portion 3a of the speed reduction device 3. The tray pressing portion 6 is located at a position where the pressing roller comes into contact with the upper surface of the tray 7 when the tray 7 placed on the conveyor belt 2 passes below the tray pressing portion 6. That is, while the decelerating section 3a is in contact with the tray 7 conveyed on the conveyor belt 2, the tray pressing section 6 can be in contact with the tray 7 while suppressing friction against the tray 7.

The plurality of trays 7 have a mounting table on which the conveyed material M can be mounted, and are conveyed by the conveyor 2. A plurality of trays 7 are juxtaposed in the conveying direction on the conveyor belt 2. The plurality of trays 7 move in the conveying direction together with the conveyor belt 2 in a state of being placed on the conveyor belt 2. Therefore, the conveying direction of the tray 7 is the moving direction of the conveyor 2, and is the direction in which the conveying surface 2a of the conveyor 2 extends.

As shown in fig. 2 and 3, the tray 7 includes a tray main body portion 7a, a contact portion 7b, and a protruding portion 7d. The tray 7 is made of, for example, engineering plastic. The material of the tray is not limited to engineering plastic.

The tray main body 7a is a flat plate-like member on which the conveyed material M can be placed. The tray main body 7a includes a mounting table on which the conveying object M is mounted. In the present embodiment, the tray main body portion 7a is rectangular in plan view. The tray main body is placed on the conveying surface 2a of the conveyor 2. A mounting table Mb for conveying the article M is provided on the upper surface of the tray main body 7 a.

A contact portion 7b that contacts the reduction gear 3 is provided at the front end portion of the tray main body portion 7a in the conveying direction. In the present embodiment, the contact portion 7b has a contact inclined surface 7c. The contact inclined surface 7c is an inclined surface inclined in a direction away from the reduction gear 3 as it goes to the downstream side in the conveying direction. That is, the contact inclined surface 7c is provided at the conveyance direction front end portion of the tray main body portion 7a so as to face upward from the lower surface of the tray main body portion 7a as facing the downstream side in the conveyance direction.

The protruding portion 7d separates another adjacent tray 7 from the tray body portion 7 a. The protruding portion 7d protrudes from the rear end portion of the tray main body portion 7a in the conveying direction toward the upstream side in the conveying direction. The protruding portion 7d contacts the front end portion in the conveying direction of another tray 7 adjacent to the upstream side in the conveying direction of the tray 7. The protruding portion 7d separates the contact portion 7b of another tray 7 adjacent to the upstream side in the conveying direction of the tray 7 from the tray main body portion 7 a. This causes a gap between the rear end of the tray body 7a in the conveying direction and the contact portion 7b of another tray 7 adjacent to the upstream side of the tray 7 in the conveying direction. That is, an insertion portion 7e having a gap into which the speed reducing portion 3a of the speed reducing device 3 can be inserted is formed at the rear end portion of the tray 7 in the conveying direction. The insertion portion 7e is constituted by the tray main body portion 7a and the protruding portion 7d.

As shown in fig. 2, the tray 7 configured as above has a contact inclined surface 7c included in the contact portion 7b at the front end in the conveying direction. The tray 7 has an insertion portion 7e at the rear end in the conveying direction. When the other tray 7 is located at a position continuous with the downstream side in the conveying direction of the tray 7, the conveying direction front end portion of the tray 7 contacts the protrusion 7d of the other tray 7 on the downstream side in the conveying direction of the tray 7. When the other tray 7 is positioned to be continuous with the upstream side in the conveying direction of the tray 7, the protruding portion 7d provided at the rear end portion in the conveying direction of the tray 7 is in contact with the front end portion in the conveying direction of the other tray 7 on the upstream side in the conveying direction of the tray 7.

When the other tray 7 is positioned at a position continuing to the downstream side in the conveying direction of the tray 7, the insertion portion 7e of the other tray 7 is positioned at the downstream side in the conveying direction of the tray 7. When another tray 7 is positioned in a position continuing to the upstream side of the tray 7 in the conveying direction, the insertion portion 7e of the tray 7 is positioned on the downstream side of the other tray 7 in the conveying direction. In this way, even if another tray 7 among the plurality of trays 7 is positioned in a position continuous with the upstream side or the downstream side in the conveying direction, the insertion portion 7e is positioned on the downstream side in the conveying direction of the tray 7.

The control device 8 is a device that controls the first stopper 4 and the second stopper 5. The control device 8 may be substantially configured by connecting a CPU, a ROM, a RAM, an HDD, and the like via a bus bar, or may be configured by a single-chip LSI or the like. The control device 8 stores various programs and data for controlling the operations of the first stopper 4 and the second stopper 5.

The control device 8 is electrically connected to an actuator of a control mechanism, not shown, of the first stopper 4 and an actuator of a control mechanism, not shown, of the second stopper 5. The control means 8 are able to send control signals to the actuator of the control mechanism of the first stopper 4 and to the actuator of the control mechanism of the second stopper 5.

The control device 8 can switch the position of the first stopper 4 between the work stop position SP1 and the work release position RP1 by controlling the actuator. The control device 8 can control the actuator to switch the position of the second stopper 5 between the standby stop position SP2 and the standby release position RP2. The control device 8 sets a work position carrying-out time Wt required for carrying out the tray 7 from the work position Ws by the conveyor 2. Further, a standby position carrying-out time St required for the tray 7 to be carried out from the standby position Ss by the conveyor 2 is set in the control device 8.

Next, the conveyance of the tray 7 by the tray conveyance system 1 will be described. Fig. 4 is a side view showing a state in which the tray 7 is disposed at the working position Ws and the standby position Ss in the tray conveying system 1. Fig. 5 is a side view showing a state where the tray 7 is carried out from the working position Ws in the tray conveying system 1. Fig. 6 is a side view showing a state where the tray 7 is conveyed from the working position Ws to the working position Ws in the tray conveying system 1. Fig. 7 is a side view showing a state in which the arrangement of the tray 7 is completed at the working position Ws and the standby position Ss in the tray conveying system 1. Fig. 8 is a diagram showing a control flow of the first stopper 4 and the second stopper 5 in the tray conveying system 1.

In the present embodiment, the first stopper 4 is in the initial state in the state of being switched to the work stop position SP1. The second stopper 5 is set to the initial state in the state switched to the standby stop position SP2. In the present embodiment, the tray conveying system 1 includes a first tray 7A, a second tray 7B, a third tray 7C, and a fourth tray 7D as the plurality of trays 7. In the tray conveying system 1, the first tray 7A, the second tray 7B, the third tray 7C, and the fourth tray 7D are smoothly positioned from the downstream side to the upstream side in the conveying direction of the conveyor belt 2.

As shown in fig. 4, the first tray 7A is stopped at the working position Ws on the conveyor belt 2 by the first stopper 4. The first tray 7A is located at the working position Ws. The second tray 7B is stopped at the standby position Ss on the conveyor belt 2 by the second stopper 5. The second tray 7B is located at the standby position Ss. On the upstream side in the conveying direction of the second tray 7B, the third tray 7C is continuous with the second tray 7B and stops. Further, the fourth tray 7D is continuous with the third tray 7C and stops on the upstream side of the third tray 7C in the conveying direction.

The insertion portion 7e of the second tray 7B is located on the downstream side in the conveying direction of the third tray 7C. That is, the insertion portion 7e of the second tray 7b is located at a position continuous with the downstream side in the conveying direction of the contact portion 7b of the third tray 7C. Similarly, the insertion portion 7e of the third tray 7C is located at a position continuous with the downstream side in the conveying direction of the contact portion 7b of the fourth tray 7D.

The reduction gear 3 of the tray conveying system 1 is located near the insertion portion 7e of the second tray 7B stopped at the standby position Ss. The decelerating section 3a of the decelerating device 3 is inserted into the insertion section 7e of the second tray 7B from below the conveyor belt 2 by the urging force of the urging section 3B. That is, the decelerating section 3a is located on the downstream side in the conveying direction of the contact section 7b of the third tray 7C. At this time, the decelerating portion 3a does not contact the contact portion 7b of the third tray 7C.

The conveyance control of the tray 7 by the control device 8 will be described with reference to fig. 5 to 8.

As shown in fig. 8, in step S110, the control device 8 of the tray conveying system 1 maintains the state in which the first stopper 4 is switched to the work stop position SP1 until the work for the conveyed article M placed on the first tray 7A at the work position Ws is completed. Similarly, the control device 8 maintains the state in which the second stopper 5 is switched to the standby stop position SP2 until the work for the conveyed material M placed on the first tray 7A is completed at the work position Ws.

As shown in fig. 5 and 8, when the work on the conveyed article M placed on the first tray 7A is completed at the work position Ws in step S120, the control device 8 switches the first stopper 4 from the work stop position SP1 to the work release position RP1. In step S130, the control device 8 maintains the state in which the first stopper 4 is switched to the operation release position RP1 until the operation position carrying-out time Wt required for carrying out the first tray 7A from the operation position Ws by the conveyor 2 elapses after the first stopper 4 is switched to the operation release position RP1. The first tray 7A is carried out from the work position Ws by the conveyor 2.

As shown in fig. 6 and 8, in step S140, the control device 8 switches the first stopper 4 to the work stop position SP1 after the work position carry-out time Wt has elapsed.

As shown in fig. 7 and 8, in step S150, the control device 8 switches the second stopper 5 from the standby stop position SP2 to the standby release position RP2 at an arbitrary timing after the work position carry-out time Wt elapses from the switching of the first stopper 4 to the work release position RP1. In step S160, the control device 8 maintains the state in which the second stopper 5 is switched to the standby release position RP2 until the standby position carrying-out time St required for carrying out the second tray 7B from the standby position Ss by the conveyor 2 elapses after the second stopper 5 is switched to the standby release position RP2. In step S170, the control device 8 switches the second stopper 5 to the standby stop position SP2 after the working position carry-out time Wt elapses.

When the second stopper 5 is switched to the standby release position RP2, the second tray 7B stopped by the second stopper 5 is carried out to the working position Ws by the conveyor 2. The second tray 7B is conveyed to the downstream side in the conveying direction until it comes into contact with the first stopper 4. The second tray 7B is located at the working position Ws by being in contact with the first stopper 4.

When the second tray 7B is conveyed to the downstream side in the conveying direction, the third tray 7C which is continuous and stopped with the upstream side in the conveying direction of the second tray 7B is conveyed to the downstream side in the conveying direction in a state of being continuous with the second tray 7B. When the third tray 7C is conveyed to the downstream side in the conveying direction, it contacts the contact portion 7b of the reduction gear 3 located on the downstream side in the conveying direction of the third tray 7C. As a result, the third tray 7C is decelerated by the deceleration device 3, that is, the conveyance speed of the third tray 7C is lower than the conveyance speed of the second tray 7B on the downstream side in the conveyance direction. Therefore, the third tray 7C is isolated from the second tray 7B.

The second tray 7B is conveyed from the standby position Ss to the working position Ws while the standby position carrying-out time St has elapsed. On the other hand, since the third tray 7C is decelerated by the deceleration device 3, the third tray does not reach the standby position Ss even after the standby position carrying-out time St. Thus, the tray conveying system 1 can insert the second tray 7B between the second tray 7B and the third tray 7C by switching the second stopper 5 to the standby stop position SP2 after the standby position carrying-out time St has elapsed.

The third tray 7C is located at the standby position Ss by coming into contact with the second stopper 5 switched to the standby stop position SP2 when passing through the reduction gear 3. The fourth tray 7D continuing to the upstream side in the conveying direction of the third tray 7C is conveyed to the downstream side in the conveying direction in a state of continuing to the third tray 7C. When the third tray 7C comes into contact with the second stopper 5 and stops at the standby position Ss, the fourth tray 7D is continuous with the upstream side in the conveying direction of the third tray 7C and stops.

The tray conveying system 1 configured as described above includes: a first tray 7A, a second tray 7B, a third tray 7C, and a fourth tray 7D, which are a plurality of trays 7 having a mounting table on which the conveyed material M can be mounted; a conveyor 2 having a conveying surface 2a for conveying the first tray 7A, the second tray 7B, the third tray 7C, and the fourth tray 7D; a speed reduction portion 3a of the speed reduction device 3 that contacts one tray 7 of the first tray 7A, the second tray 7B, the third tray 7C, and the fourth tray 7D; a biasing portion 3b for biasing the speed reducing portion 3a toward the one tray 7; a first stopper 4 that switches between a work stop position SP1 at which one tray 7 is stopped at the work position Ws and a work release position RP1 at which the one tray 7 is carried out from the work position Ws; and a second stopper 5 that switches between a standby stop position SP2 at which one tray 7 is stopped at a standby position Ss and a standby release position RP2 at which the one tray 7 is carried out from the standby position Ss, wherein the standby position Ss is located on the downstream side in the conveying direction from the position of the speed reducing portion 3a and on the upstream side in the conveying direction from the operating position Ws.

When the work of the first tray 7A stopped at the work position Ws for the conveyed article M is completed, the first stopper 4 is switched from the work stop position SP1 to the work release position RP1. After the operation position carrying-out time Wt required for carrying out the first tray 7A at the operation position Ws from the operation position Ws has elapsed, the first stopper 4 is switched to the operation stop position SP1. After the working position carrying-out time Wt has elapsed since the first stopper 4 was switched to the working release position RP1, the second stopper 5 is switched to the standby release position RP2. Further, when the standby position carrying-out time St required to carry out the second tray 7B stopped at the standby position Ss from the standby position Ss has elapsed, the second stopper 5 is switched to the standby stop position SP2. The third tray 7C on the upstream side in the conveying direction of the second tray 7B from the standby position Ss is carried into the standby position Ss while being decelerated by the deceleration section 3a.

The first stopper 4 of the tray conveying system 1 is switched between the work release position RP1 and the work stop position SP1 after the work position carry-out time Wt has elapsed since the work on the work position Ws of the first tray 7A was completed. The second stopper 5 is switched to the standby release position RP2 when the working position carry-out time Wt elapses. Further, when the standby position carrying-out time St elapses after the second tray 7B is switched to the standby release position RP2, it is switched to the standby stop position SP2. At this time, the third tray 7C and the fourth tray 7D on the upstream side of the second tray 7B from the standby position Ss are decelerated by the deceleration section 3a, and therefore, the second stoppers 5 are stopped at the standby position Ss after being switched to the standby stop position SP2. Thus, the tray transport system 1 can switch the first stopper 4 and the second stopper 5 based on the work position carry-out time Wt and the standby position carry-out time St.

Next, the deceleration of the pallet 7 by the deceleration device 3 in the pallet transport system 1 will be described in detail with reference to fig. 5 to 8 and 9. Fig. 9 is a side view showing a state of the force applied to the tray 7 when the tray 7 is in contact with the reduction gear 3. In the present embodiment, the second tray 7B stopped at the standby position Ss by the second stopper 5 and the third tray 7C continued to the upstream side in the conveying direction of the second tray 7B and stopped will be described.

As shown in fig. 5, the insertion portion 7e provided at the conveying direction rear end portion of the second tray 7B is located at a position adjacent to the conveying direction front end portion of the third tray 7C. That is, the insertion portion 7e of the second tray 7b is located adjacent to the downstream side in the conveying direction of the contact portion 7b provided at the front end portion in the conveying direction of the third tray 7C. The contact portion 7b provided at the conveying direction front end portion of the fourth tray 7D is located at a position adjacent to the conveying direction rear end portion of the third tray 7C.

The speed reduction unit 3a of the speed reduction device 3 is inserted into the insertion portion 7e of the second tray 7B from below the conveyor belt 2 by the biasing force of the biasing unit 3B. That is, the decelerating section 3a is located on the downstream side in the conveying direction of the contact section 7b of the third tray 7C. In this way, by providing the contact portion 7b at the front end portion in the conveying direction and providing the insertion portion 7e at the rear end portion in the conveying direction, the tray 7 has a space in which the speed reducing portion 3a of the speed reducing device 3 is arranged on the downstream side in the conveying direction of the contact portion 7b even when another tray 7 is located at a position continuing to the downstream side in the conveying direction.

As shown in fig. 6, when the second stopper 5 is switched to the standby release position RP2, the second tray 7B stopped by the second stopper 5 is carried out toward the downstream side in the conveying direction by the conveyor belt 2. When the second tray 7B is conveyed to the downstream side in the conveying direction, the third tray 7C which is continuous and stopped with the upstream side in the conveying direction of the second tray 7B is conveyed to the downstream side in the conveying direction in a state of being continuous with the second tray 7B.

The contact portion 7b of the third tray 7C has a contact inclined surface 7C, and the contact inclined surface 7C is inclined in a direction away from the speed reduction portion 3a of the speed reduction device 3 toward the downstream side in the conveying direction. That is, the contact portion 7b has a contact inclined surface 7c inclined in a direction approaching the decelerating portion 3a as it goes to the upstream side in the conveying direction. When the tray is conveyed to the downstream side in the conveying direction together with the downstream second tray 7B and the upstream fourth tray 7D, the contact portion 7B of the third tray 7C contacts the decelerating portion 3a. The third tray 7C presses the decelerating portion 3a to the downstream side in the conveying direction by the contact inclined surface 7C of the contact portion 7b. The decelerating section 3a is pressed down in the direction of the conveying surface 2a of the conveyor belt 2 by the contact inclined surface 7c of the contact section 7b.

As shown in fig. 9, the biasing portion 3b of the reduction gear 3 generates a biasing force in a direction of pushing up the reduction portion 3a in proportion to the amount of depression of the reduction portion 3a. The decelerating section 3a presses the contact inclined surface 7c of the contact section 7b upward perpendicular to the conveying direction by the force F. On the contact inclined surface 7C of the contact portion 7b of the third tray 7C, an inclined surface direction component force F1 parallel to the contact inclined surface 7C of the contact portion 7b and directed to the downstream side in the conveying direction and a vertical direction component force F2 perpendicular to the contact inclined surface 7C are generated as component forces of the force F transmitted from the speed reducing portion 3a of the speed reducing device 3. The vertical direction component force F2 is a component force toward the upstream side in the conveying direction. Therefore, the third tray 7C is decelerated by the vertical direction component force F2, which is a component force of the force F transmitted from the decelerating section 3a.

The third tray 7C is conveyed to the downstream side in the conveying direction, and presses down the decelerating portion 3a by the contact inclined surface 7C. Thus, in the third tray 7C, the force F transmitted from the decelerating section 3a increases as the tray is conveyed to the downstream side in the conveying direction. Similarly, in the third tray 7C, the inclined surface direction component force F1 and the vertical direction component force F2 transmitted from the speed reducer portion 3a increase as the tray is conveyed to the downstream side in the conveying direction. That is, the third tray 7C is decelerated at a deceleration that increases at a certain rate as it is conveyed to the downstream side in the conveying direction.

In this way, while the third tray 7C is being conveyed to the downstream side in the conveying direction, the deceleration portion 3a of the deceleration device 3 comes into contact with the contact inclined surface 7C, and a vertical direction component force F2 directed to the upstream side in the conveying direction is generated. While the decelerating portion 3a contacts the contact inclined surface 7C and moves on the contact inclined surface 7C, the third tray 7C is decelerated by the vertical direction component force F2 directed to the upstream side in the conveying direction. At this time, the third tray 7C is decelerated at a deceleration that increases at a certain rate as it is conveyed to the downstream side in the conveying direction. Further, the rollers constituting the speed reducing portion 3a rotate while contacting the contact inclined surface 7c of the tray 7. That is, in the third tray 7C, no decelerating force due to sliding friction is generated when the contact portion 7b contacts. Thus, even if the plurality of trays 7 are aligned and conveyed without a gap in the tray conveying system 1, one tray 7 can be decelerated without disturbing the alignment of the plurality of trays 7.

The third tray 7C transmits a vertical component F2, which is a component in a direction separating from the conveying surface 2a of the conveyor belt 2, from the speed reducer 3a of the speed reducer 3. In the third tray 7C, the vertical direction component force F2 transmitted from the decelerating section 3a increases as it is conveyed to the downstream side in the conveying direction. While the decelerating portion 3a is in contact with the third tray 7C, the roller of the tray pressing portion 6 is in contact with the upper surface of the third tray 7C. That is, even if the vertical direction component force F2 transmitted from the decelerating section 3a increases, the third tray 7C can be prevented from floating from the conveying surface 2a of the conveyor belt 2, from being disturbed in posture, and the like by the tray pressing section 6. Therefore, in the third tray 7C, the vertical direction component force F2 is not dispersed by the floating of the third tray 7C.

By the conveyance to the downstream side in the conveyance direction, the third tray 7C presses down the decelerating portion 3a of the decelerating device 3 to the lower limit position, which is a state where it does not protrude from the conveyance surface 2a of the conveyor 2, by the contact inclined surface 7C of the contact portion 7b. The third tray 7C presses down the speed reduction part 3a to the lower limit position by the bottom surface of the tray main body part 7a provided at the conveying direction upstream side end contacting the inclined surface 7C. The third tray 7C is further conveyed to the downstream side in the conveying direction in a state where the decelerating portion 3a is pressed down to the lower limit position by the bottom surface of the tray main body portion 7 a.

As shown in fig. 7, in the third tray 7C, when being conveyed to the downstream side in the conveying direction, the decelerating portion 3a is inserted into an insertion portion 7e provided at the rear end portion of the tray main body portion 7a in the conveying direction. The speed reducer portion 3a of the speed reducer 3 inserted into the insertion portion 7e of the third tray 7C is located on the downstream side in the conveying direction of the contact portion 7b of the fourth tray 7D. Therefore, the contact portion 7b of the fourth tray 7D contacts the decelerating portion 3a when being conveyed to the downstream side in the conveying direction. Thus, the insertion portion 7e is provided at the rear end portion of the third tray 7C in the conveying direction. Therefore, the insertion portion 7e of the third tray 7C into which the decelerating portion 3a can be inserted is located on the downstream side in the conveying direction of the contact portion 7b of the fourth tray 7D.

[ embodiment 2]

The tray conveying system 1A according to embodiment 2 will be described below. Fig. 10 shows a schematic configuration of the tray 9 of the tray conveying system 1A according to embodiment 2. The tray 9 has a protruding portion 9d at the front end portion in the conveying direction of the tray main body portion 9 a. The configuration of the tray conveying system 1A is the same as that of the tray conveying system 1A of embodiment 1 except for the tray 9. Therefore, the same configuration as that of embodiment 1 will not be described below, and only the configuration of the tray 9 will be described below.

A contact portion 9b that contacts the reduction gear 3 is provided at the front end portion of the tray main body portion 9a in the conveying direction. The contact inclined surface 9c is an inclined surface inclined in a direction away from the reduction gear 3 as it goes to the downstream side in the conveying direction.

The protruding portion 9d of the tray 9 separates the adjacent tray 9 from the tray main body portion 9 a. The protruding portion 9d protrudes from the front end portion of the tray body portion 9a in the conveying direction toward the downstream side in the conveying direction. That is, the protruding portion 9d protrudes from the front end portion of the contact portion 9b in the conveying direction toward the downstream side in the conveying direction. The protruding portion 9d contacts the conveying direction rear end portion of another tray 9 adjacent to the downstream side of the conveying direction of the tray 9. The protruding portion 9d separates another tray 9 adjacent on the downstream side in the conveying direction of the tray 9 from the contact portion 9b of the tray 9. This causes a gap between the contact portion 9b and another tray 9 adjacent to the downstream side in the conveying direction. That is, an insertion portion 9e having a gap into which the speed reducing portion 3a of the speed reducing device 3 can be inserted is formed at the front end portion of the tray 9 in the conveying direction. The insertion portion 9e is constituted by the contact portion 9b and the protruding portion 9d.

The tray 9 configured as described above has a contact inclined surface 9c as a part of the contact portion 9b at the front end portion in the conveying direction of the tray main body portion 9 a. The tray 9 has a projection 9d as a part of the insertion portion 9e at the front end in the conveying direction of the contact portion 9b. When the other tray 9 is located at a position continuous with the downstream side in the conveying direction of the tray 9, the protruding portion 9d provided at the conveying direction front end portion of the tray 9 comes into contact with the tray main body portion 9a of the other tray 9 on the downstream side in the conveying direction of the tray 9. When the other tray 9 is positioned in a position continuous with the upstream side in the conveying direction of the tray 9, the conveying direction rear end portion of the tray 9 contacts the protrusion portion 9d of the other tray 9 on the upstream side in the conveying direction of the tray 9. Thus, the insertion portion 9e of the tray 9 is located on the downstream side in the conveying direction of the contact portion 9b.

The decelerating section 3a of the decelerating device 3 is inserted into the insertion section 9e of the tray 9 from below the conveyor belt 2 by the urging force of the urging section 3b. That is, the decelerating section 3a is located on the downstream side in the conveying direction of the contact section 9b of the tray 9. In this way, by providing the insertion portion 9e at the front end portion of the contact portion 9b in the conveying direction, the tray 9 has a space in which the speed reducing portion 3a of the speed reducing device 3 is arranged on the downstream side of the contact portion 9b in the conveying direction even when another tray 9 is located at a position continuing to the downstream side in the conveying direction.

[ embodiment 3]

The tray conveying system 1B according to embodiment 3 will be described below. Fig. 11 shows a schematic configuration of the tray 10 of the tray conveying system 1B according to embodiment 3. As shown in fig. 11, the tray 10 has protruding portions at the front end portion and the rear end portion in the conveying direction of the tray main body portion 10 a.

The tray 10 has a tray main body portion 10a, a contact portion 10b, a front protrusion 10d, and a rear protrusion 10f.

The front projection 10d separates another tray 10 located at a position continuous with the downstream side of the tray 10 in the conveying direction from the tray main body 10 a. The front projecting portion 10d projects from the front end portion of the tray body portion 10a in the conveying direction toward the downstream side in the conveying direction. That is, the front projection 10d projects from the front end of the contact portion 10b of the tray 10 in the conveying direction toward the downstream side in the conveying direction. The front projection 10d contacts the conveying-direction rear end portion of another tray 10 adjacent to the downstream side of the tray 10 in the conveying direction. The front projection 10d separates another tray 10 adjacent to the downstream side in the conveying direction of the tray 10 from the contact portion 10b of the tray 10. This causes a gap between the contact portion 10b of the tray 10 and another tray 10 adjacent to the downstream side in the conveying direction. That is, a front insertion portion 10e having a gap into which the speed reduction portion 3a of the speed reduction device 3 can be inserted is formed at the front end portion of the tray 10 in the conveying direction. The front insertion portion 10e is constituted by the contact portion 10b and the front protrusion portion 10d.

The rear projection 10f separates another tray 10 located at a position continuous to the upstream side in the conveying direction of the tray 10 from the tray main body 10 a. The rear protruding portion 10f protrudes from the rear end portion of the tray main body portion 10a in the conveying direction toward the upstream side in the conveying direction. The rear protruding portion 10f contacts the conveying-direction rear end portion of another tray 10 located at a position continuous to the upstream side in the conveying direction of the tray 10. The rear protrusion 10f separates another tray 10 adjacent to the upstream side in the conveying direction of the tray 10 from the tray main body 10 a. This causes a gap between the tray main body 10a and another tray 10 adjacent to the upstream side in the conveying direction. That is, a rear insertion portion 10g having a gap into which the speed reduction portion 3a of the speed reduction device 3 can be inserted is formed at the rear end portion of the tray 10 in the conveying direction. The rear insertion portion 10g is composed of a tray main body portion 10a and a rear protrusion portion 10f.

The tray 10 configured as described above has the front protruding portion 10d as a part of the front insertion portion 10e at the front end portion in the conveying direction of the contact portion 10 b. The tray 10 has a rear protruding portion 10f as a part of the rear insertion portion 10g at the rear end portion of the tray main body portion 10a in the conveying direction. When the first tray 10A is adjacent to the downstream side in the conveying direction of the tray 10, the front projection 10d provided at the front end in the conveying direction of the tray 10 contacts the rear projection 10f of another tray 10 on the downstream side in the conveying direction of the tray 10. When another tray 10 is adjacent to the upstream side in the conveying direction of the tray 10, the rear protrusion 10f provided at the rear end in the conveying direction of the tray 10 contacts the front protrusion 10d of another tray on the upstream side in the conveying direction of the tray 10. In this way, the tray 10 has the front insertion portion 10e constituted by the front protrusion 10d provided at the front end portion of the contact portion 10b in the conveying direction and the rear protrusion 10f of the other tray 10. In the tray 10, a rear insertion portion 10g is formed by a rear protrusion 10f provided at the rear end portion of the tray main body portion 10a in the conveying direction and a front protrusion 10d of another tray 10.

The decelerating section 3a of the decelerating device 3 is inserted into the front insertion section 10e of the tray 10 from below the conveyor belt 2 by the urging force of the urging section 3b. That is, the decelerating section 3a is located on the downstream side in the conveying direction of the contact section 10b of the tray 10. In this way, by providing the front insertion portion 10e at the front end portion of the contact portion 10b in the conveying direction, the tray 10 has a space in which the speed reduction portion 3a of the speed reduction device 3 is arranged on the downstream side of the contact portion 10b in the conveying direction even when another tray 10 is located at a position continuing to the downstream side in the conveying direction.

Thus, the tray conveying systems 1 and 1A include: trays 7 and 9 having a placement base Mb on which the transported object M can be placed; a conveyor belt 2 having a conveying surface 2a for conveying the trays 7 and 9; a speed reducing part 3a contacting with the trays 7 and 9; and a biasing part 3b for biasing the speed reducer 3a to the trays 7 and 9. The plurality of trays 7 and 9 have contact portions 7b and 9b that contact the speed reduction portion 3a of the speed reduction device 3, protruding portions 7d and 9d, and insertion portions 7e and 9e into which the speed reduction portion 3a is inserted. The protruding portion 7d is located at the front end portion of the contact portion 7b in the conveying direction. The protruding portion 9d is located at the conveyance direction rear end portion of the tray main body portion 9 a. The insertion portion 9e of the tray 10 includes at least one of a protruding portion 9d protruding from the front end portion in the conveying direction of the contact portion 10b toward the downstream side in the conveying direction, and a protruding portion 9d protruding from the rear end portion in the conveying direction of the tray main body portion 10a including the placement base Mb toward the upstream side in the conveying direction.

In the case of the tray 7 having the insertion portion 7e at the front end portion in the conveying direction of the contact portion 7b, the speed reduction portion 3a of the speed reduction device 3 can be disposed on the downstream side in the conveying direction of the contact portion 7b. In the case of a tray 7 having an insertion portion 7e at the front end portion in the conveying direction of the contact portion 7b, a tray 9 having an insertion portion 9e at the rear end portion in the conveying direction of the tray main body portion 9a, and a tray 10 having a front insertion portion 10e at the front end portion in the conveying direction and a rear insertion portion 10g at the rear end portion in the conveying direction, the speed reduction portion 3a can be disposed on the downstream side in the conveying direction of the contact portions 7b, 9b, and 10b even if other trays are arranged without a gap in the conveying direction. The contact portions 7b, 9b, and 10b contact the decelerating portion 3a inserted into the insertion portions 7e, 9e, and 10e when the conveyor 2 moves in the conveying direction. This allows the speed of the trays 7, 9, and 10 sandwiched between the other trays to be reduced by the speed reducing section 3a.

Further, the tray 7 has a space for inserting the reduction unit 3a of the reduction gear unit 3 on the downstream side in the conveyance direction of the contact portion 7b by having the protrusion portion 7d at the conveyance direction front end portion of the contact portion 7b. Similarly, the tray 9 has a protruding portion 9d at the conveyance direction rear end portion of the tray main body portion 9a including the placement base Mb, and thus has a space for inserting the speed reducing portion 3a at the conveyance direction downstream side of the contact portion 9b of the other tray 9 on the upstream side of the tray 9. This allows the trays 7 and 9 sandwiched by other trays to be decelerated in the front and rear direction.

Further, the tray conveying systems 1, 1A, and 1B may be provided with the speed reduction devices 3 on both sides in the width direction of the conveyor 2. Fig. 12 is a schematic plan view showing another embodiment of the tray in the tray conveying systems 1, 1A, 1B of the present invention. The tray conveying system 1, 1A, 1B has, for example, a left reduction gear 3A and a right reduction gear 3B. The speed reduction units 3Aa and 3Ba of the left and right speed reduction devices 3A and 3B are located at positions movable in the width direction of the conveyor belt 2. In this case, the tray 11 is provided with a left contact portion 11Ab and a right contact portion 11Bb on both left and right sides of the tray main body portion 11a in a plan view.

As shown in fig. 12, the protruding portion 11d separates the tray connected to the tray main body portion 11 a. The protruding portion 11d protrudes from the front end portion of the tray body 11a in the conveying direction toward the downstream side in the conveying direction. The protruding portion 11d protrudes with a width smaller than the width of the tray main body portion 11a in the left-right direction.

A left contact portion 11Ab that contacts the left reduction gear 3A is provided at a left direction end portion, which is a front end portion in the conveying direction of the tray main body portion 11 a. A right contact portion 11Bb that contacts the right reduction gear 3B is provided at a right end portion, which is a front end portion in the conveying direction of the tray main body portion 11 a. The left contact inclined surface 11Ac of the left contact portion 11Ab is an inclined surface that is inclined in a direction away from the left reduction gear unit 3A as it goes to the downstream side in the conveyance direction. The right contact inclined surface 11Bc of the right contact portion 11Bb is an inclined surface that is inclined in a direction away from the right reduction gear unit 3B as it goes to the downstream side in the conveying direction.

The left contact portion 11Ab protrudes leftward from the left end of the protruding portion 11 d. The right contact portion 11Bb protrudes more rightward than the right end portion of the protruding portion 11 d. Thus, the left insertion portion 11Ae into which the left decelerating portion 3Aa of the left decelerating device 3A can be inserted is configured at a position on the left side of the left end of the protruding portion 11d on the downstream side in the conveying direction of the left contact portion 11Ab. Similarly, a right insertion portion 11Be into which the right decelerating portion 3Ba of the right decelerating device 3B can Be inserted is formed on the downstream side of the right contact portion 11Bb in the conveying direction and on the right side of the right end of the protruding portion 11 d.

[ embodiment 4]

Hereinafter, a tray conveying system 1C according to embodiment 4 will be described with reference to fig. 13. Fig. 13 shows a schematic configuration of a tray conveying system 1C according to embodiment 4. The pallet 12 of the pallet conveying system 1C has a contact portion wheel 12C at a contact portion 12b. The speed reducer 13 of the tray conveying system 1C has a speed reducer inclined surface 13C.

A contact portion 12b that contacts the reduction gear 13 is provided at the front end portion of the tray main body portion 12a of the tray 12 in the conveying direction. In the present embodiment, the contact portion 12b has a contact portion wheel 12c. The contact portion wheel 12c is provided at the front end portion of the tray main body portion 12a in the conveying direction. The contact portion wheel 12c is configured to be rotatable in the conveying direction.

The decelerating section 13a of the decelerating device 13 has a decelerating section inclined surface 13c. The decelerating portion 13a is located below the conveyor 2 with the decelerating-portion inclined surface 13c facing upward and toward the upstream side in the conveying direction. The decelerating section 13a is configured to be movable in a direction perpendicular to the conveying direction of the tray 12. In the present embodiment, the decelerating section 13a is configured to be movable in a direction perpendicular to the conveying direction of the tray 12 and in a direction perpendicular to the conveying surface 2a of the conveyor 2. The decelerating portion inclined surface 13c of the decelerating portion 13a is an inclined surface inclined in a direction approaching the tray 12 as going to the downstream side in the conveying direction of the conveyor 2. The contact portion wheel 12c of the tray 12 contacts the decelerating portion inclined surface 13c of the decelerating portion 13 a.

The contact portion wheel 12c of the tray 12 contacts the deceleration portion inclined surface 13c of the deceleration portion 13a when being conveyed to the downstream side in the conveying direction. The contact portion wheel 12c rotates while contacting the decelerating portion inclined surface 13c of the decelerating portion 13 a. The tray 12 presses the speed reducer 13a to the downstream side in the conveying direction by the contact portion wheel 12c of the contact portion 12b. The decelerating section 13a is pushed down in the direction of the conveying surface 2a of the conveyor belt 2 by the contact section wheels 12c of the contact section 12b.

The decelerating section 13a presses the contact section wheel 12c of the contact section 12b upward perpendicular to the conveying direction. As the component force of the force transmitted from the decelerating portion 13a of the decelerating device 3, the contact portion wheel 12c of the contact portion 12b generates an inclined surface direction reaction force parallel to the decelerating portion inclined surface 13c of the decelerating portion 13a and directed to the upstream side in the conveying direction, and a vertical direction component force in the direction perpendicular to the decelerating portion inclined surface 13c. The pallet 12 is decelerated by the reaction force in the inclined surface direction transmitted from the decelerating portion 13a and the vertical direction component force in the direction perpendicular to the decelerating portion inclined surface 13c.

The pallet transport system 1C configured as described above includes the contact portion wheels 12C at the contact portion 12b of the pallet 12. Since the contact portion wheel 12c rotates while coming into contact with the deceleration portion 13a of the deceleration device 13, a large deceleration force due to friction does not occur when the deceleration portion 13a comes into contact with the contact portion 12b. Thus, even if the plurality of trays 12 are conveyed in line without a gap, the trays 12 sandwiched between the other trays in the front and rear direction can be decelerated without disturbing the line of the plurality of trays 12.

[ embodiment 5]

The tray conveying system 1D according to embodiment 5 will be described below. Fig. 14 is a side view of a tray conveying system 1D according to embodiment 5. The tray 14 has an acceleration inclined surface 14e at the rear end portion of the tray main body portion 14a in the conveying direction.

As shown in fig. 14, a contact portion 14b that contacts the reduction gear 3 is provided at the front end portion of the tray main body portion 14a in the conveying direction. The contact inclined surface 14c is an inclined surface inclined in a direction away from the reduction gear transmission 3 toward the downstream side in the conveying direction.

The protruding portion 14d separates the adjacent tray 14 from the tray main body portion 14 a. The protruding portion 14d protrudes from the rear end portion of the tray body portion 14a in the conveying direction toward the upstream side in the conveying direction. The protruding portion 14d contacts the conveying direction rear end portion of another tray adjacent to the upstream side of the conveying direction of the tray 14.

The projection 14d is provided with an acceleration inclined surface 14e that contacts the reduction gear 3. The acceleration inclined surface 14e is an inclined surface that is inclined in a direction away from the deceleration device 3 as it goes toward the upstream side in the conveying direction. That is, an acceleration slope 14e is provided at the rear end portion of the tray main body portion 14a in the conveying direction, and the acceleration slope 14e is directed upward from the lower surface of the tray main body portion 14a toward the upstream side in the conveying direction.

The tray 14 configured as above pushes down the decelerating portion 3a to the lower limit position by the contact inclined surface 14c of the contact portion 14b. The tray 14 presses the speed reducer portion 3a down to the lower limit position by the bottom surface of the tray main body portion 14a provided on the upstream side end in the conveying direction of the contact inclined surface 14 c. The tray 14 is conveyed to the downstream side in the conveying direction in a state where the decelerating portion 3a is pressed down to the lower limit position by the bottom surface of the tray main body portion 14 a. When the acceleration inclined surface 14e of the tray 14 is further conveyed to the downstream side in the conveying direction, it comes into contact with the decelerating portion 3a. The decelerating section 3a presses the contact inclined surface 14c of the contact section 14b upward perpendicular to the conveying direction.

On the acceleration inclined surface 14e of the protrusion 14d, a reaction force in the inclined surface direction parallel to the acceleration inclined surface 14e and directed upstream in the conveying direction and a vertical direction component force in the direction perpendicular to the acceleration inclined surface 14e are generated as a component force of the force pressing the deceleration part 3a transmitted from the deceleration part 3a of the deceleration device 3. The tray 14 is accelerated by the reaction force in the inclined surface direction and the component force in the vertical direction transmitted from the decelerating portion 3a. The amount of pressing down of the decelerating portion 3a by the acceleration inclined surface 14e decreases as the tray 14 is conveyed to the downstream side in the conveying direction. Thus, the force transmitted from the decelerating section 3a decreases as the tray 14 is conveyed to the downstream side in the conveying direction. Similarly, in the tray 14, the inclined surface direction reaction force and the vertical direction component force transmitted from the decelerating section 3a decrease as the tray is conveyed to the downstream side in the conveying direction. That is, the tray 14 is accelerated at an acceleration that decreases at a certain rate as it is conveyed to the downstream side in the conveying direction.

In this way, the deceleration portion 3a of the deceleration device 3 is brought into contact with the acceleration inclined surface 14e while being conveyed to the downstream side in the conveying direction on the tray 14, thereby generating an inclined surface direction reaction force and a vertical direction component force toward the downstream side in the conveying direction. While the decelerating portion 3a is in contact with the acceleration inclined surface 14e and moves on the acceleration inclined surface 14e, the tray 14 is accelerated by an inclined surface direction reaction force and a vertical direction component force toward the downstream side in the conveying direction. At this time, the tray 14 is accelerated at an acceleration that decreases at a certain rate as it is conveyed to the downstream side in the conveying direction. The accelerated tray 14 is separated from the tray 14 on the upstream side of the tray 14. This allows the upstream-side tray 14 to be decelerated without being affected by the downstream-side tray 14.

The embodiments of the present invention have been described above, but the above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments without departing from the scope of the present invention.

Possibility of industrial utilization

The present invention can be applied to a tray that has a mounting table on which a conveying object can be mounted and that is conveyed by a conveyor belt, and a tray conveying system.

Description of the reference symbols

1. Tray conveying system

2. Conveyor belt

3. Reduction gear

3a speed reduction part

3b force application part

7. Tray

7a tray body

7b contact part

7c contact inclined surface

7d projection

7e insert part.

Claims (12)

1. A tray which has a placing table on which a transported object can be placed and which is transported by a conveyor belt, comprising:

a contact portion that contacts a speed reduction device that reduces the speed of the tray; and

an insertion portion into which the reduction gear is inserted,

the insertion portion is located at least one of a front end portion of the contact portion in the conveying direction and a rear end portion of the mounting table in the conveying direction.

2. The tray of claim 1,

the contact portion has a contact inclined surface inclined in a direction away from the speed reducer unit toward a downstream side in the conveying direction.

3. The tray according to claim 1,

the contact portion has a contact portion wheel rotatable in a conveying direction.

4. The tray according to any one of claims 1 to 3,

the insertion portion has at least one of a protruding portion protruding from a conveyance direction leading end portion of the contact portion toward a conveyance direction downstream side and a protruding portion protruding from a conveyance direction trailing end portion of the mounting table toward a conveyance direction upstream side.

5. The tray according to any one of claims 1 to 4,

the tray further includes an acceleration inclined surface inclined in a direction away from the speed reducer as it goes toward an upstream side in the conveying direction at a rear end portion in the conveying direction of the tray.

6. A pallet transport system, comprising:

a tray having a placing table on which a transported object can be placed;

a conveyor belt having a conveying surface for conveying the tray;

a deceleration part contacting the tray; and

a force application part for applying force to the speed reduction part towards the tray,

the tray has:

a contact portion that contacts the decelerating portion; and

an insertion portion into which the decelerating portion is inserted,

the insertion portion is located at least one of a front end portion of the contact portion in the conveying direction and a rear end portion of the mounting table in the conveying direction.

7. The pallet transport system of claim 6,

the contact portion has a contact inclined surface inclined in a direction away from the decelerating portion as it goes to a downstream side in the conveying direction of the conveyor belt, and the decelerating portion contacts the contact inclined surface.

8. The tray conveying system according to claim 6 or 7,

the contact part has a contact part wheel capable of rotating at the front end part in the conveying direction,

the deceleration portion has a deceleration portion inclined surface inclined in a direction approaching the tray as the deceleration portion moves toward a downstream side in the conveying direction of the conveyor belt, and the contact portion wheel contacts the deceleration portion inclined surface.

9. The tray conveying system according to any one of claims 6 to 8,

the insertion portion has at least one of a protruding portion protruding from a front end portion of the contact portion in the conveying direction toward a downstream side in the conveying direction and a protruding portion protruding from a rear end portion of the mounting table in the conveying direction toward an upstream side in the conveying direction.

10. The tray conveying system according to any one of claims 6 to 9,

the tray further includes an acceleration inclined surface inclined in a direction away from the decelerating portion toward an upstream side in the conveying direction at a rear end portion in the conveying direction of the tray.

11. The tray conveying system according to any one of claims 6 to 10,

a tray pressing part is arranged at the position opposite to the decelerating part,

the tray pressing portion is in contact with the tray while the decelerating portion is in contact with the tray.

12. The tray conveying system according to any one of claims 6 to 11, further comprising:

a first stopper that switches between a work stop position at which the tray is stopped at a work position and a work release position at which the tray is carried out from the work position;

a second stopper that switches between a standby stop position at which the tray is stopped at a standby position and a standby release position at which the tray is carried out from the standby position, the standby position being located downstream in the conveying direction from the position of the decelerating section and upstream in the conveying direction from the working position,

the first stopper is switched from the work stop position to the work release position when the work in the work position is finished, and is switched to the work stop position after a work position carrying-out time required for carrying out the tray in the work position from the work position has elapsed,

the second stopper is switched to the standby release position after the working position carrying-out time has elapsed after the first stopper is switched to the working release position, and is switched to the standby stop position when a standby position carrying-out time required to carry out the tray at the standby position from the standby position has elapsed, and the tray on the upstream side in the conveying direction from the tray at the standby position is carried into the standby position while being decelerated by the decelerating section.

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