JP5585393B2 - Pallet support device and pallet support method - Google Patents

Description

  The present invention relates to a technique for supporting a pallet conveyed by a conveyor.

  2. Description of the Related Art A transport device that moves, stops, and fixes a pallet (loading platform) on which an object to be assembled or tested is placed is known. This conveying apparatus has a conveyor which moves a pallet with a roller or a belt, for example. Further, this transport device transports and fixes the pallet to the pallet fixing position. The operation is performed by the following procedure, for example.

(S1) The pallet on a conveyor is conveyed by driving a conveyor.
(S2) The detection sensor detects the pallet that has reached the vicinity of the fixed position.
(S3) The pallet stops in contact with a stopper disposed on the conveyor.
(S4) After a predetermined time (several hundred ms) has elapsed since the detection sensor detected the pallet, the conveyor is stopped.
(S5) The pallet is fixed by the clamper and the stopper.

  In some cases, it is necessary to fix the pallet on the conveyor without stopping the conveyor.

  As a related technique, a technique is known in which an article being conveyed on a conveyance path by a roller is sent out of the conveyance path by another roller to sort the articles (see, for example, Patent Document 1 and Patent Document 2). ).

JP-A-9-202442 No. 7-38260

  During S3 to S4 in the operation of the above-described conveying device, the pallet is stopped by the stopper while the conveyor is driven. That is, the conveyor is slipping with respect to the pallet. As a result, there is a problem that the conveyor or pallet is worn. Further, there may be a problem that scraps are generated due to the wear. If the pallet is fixed without stopping the conveyor, these problems are further increased.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a technique for reducing wear of conveyors and pallets.

  In order to solve the above-described problem, one embodiment of the present invention is a pallet that is conveyed by a conveyor, and is formed on a part of a bottom surface and supported by the conveyor, and the base portion within the bottom surface. A pallet having guide portions formed at different positions in the width direction of the transport path, a first roller disposed at the same position in the width direction with respect to the guide portions, and the width direction with respect to the guide portions. A second roller disposed at the same position and provided closer to the transport direction than the first roller and having a diameter equal to the diameter of the first roller, and the guide portion is higher in the transport direction. A second slope formed on the transport direction side of the first slope and formed so as to be higher in the transport direction than the first slope. The height of the lower end is equal to or higher than the height of the upper end of the first slope, the height of the upper end of the first roller is within the range of the height of the first slope, and the height of the upper end of the second roller is A point within the first slope that is within a height range of the second slope, and that is within a first distance in the transport direction between the upper end of the first roller and the upper end of the second roller, and from the point The second distance in the height direction between the second slope and the point in the second slope separated by the first distance in the transport direction is the distance in the height direction between the upper end of the first roller and the upper end of the second roller. It is a pallet support device characterized by being equal.

  Moreover, another aspect of the present invention is a pallet transported by a conveyor, and a base portion formed on a part of a bottom surface and supported by the conveyor, and a transport path with respect to the base portion within the bottom surface. The pallet having guide portions formed at different positions in the width direction and formed so as to be higher in the transport direction is being transported in the transport direction by the conveyor, and the width of the pallet is A first roller provided at the same position in the direction, and an upper end provided at the same position in the width direction with respect to the guide portion and provided on the transport direction side from the first roller and higher than the upper end of the first roller A second roller having a contact between the first roller and the guide portion and a contact between the second roller and the guide portion. By moving et the pallets to the conveying direction obliquely upward, a pallet supporting method comprising releasing the said base portion from said conveyor.

  According to the technique disclosed in this application, the wear of the conveyor and the pallet can be reduced.

It is a front view of a conveying apparatus. It is a top view of a conveying apparatus. It is a side view of a pallet. It is a bottom view of a pallet. It is sectional drawing of a pallet and a guide roller. It is a flowchart which shows the 1st operation example of a conveying apparatus. It is sectional drawing which shows the initial state of a 1st operation example. It is sectional drawing which shows the state of S12 in a 1st operation example. It is sectional drawing which shows the state of S13 in a 1st operation example. It is sectional drawing which shows the state of S15 in a 1st operation example. It is sectional drawing which shows the state of S17 in a 1st operation example. It is sectional drawing which shows the state of S25 in a 1st operation example. It is sectional drawing which shows the state of S27 in a 1st operation example. It is sectional drawing which shows the state of S33 in a 1st operation example. It is sectional drawing which shows the state of S35 in a 1st operation example. It is sectional drawing which shows the state of S39 in a 1st operation example. It is sectional drawing of a guide roller upper part. It is a flowchart which shows the 2nd operation example of a conveying apparatus.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a conveying apparatus 1 that is an application example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view of the transfer device 1, and FIG. 2 is a plan view of the transfer device 1. The conveying apparatus 1 conveys the pallet 2 placed on the conveying surface 3 that is a horizontal plane in the conveying direction 4. Hereinafter, the path of the pallet 2 on the transport surface 3 is referred to as a transport path. Objects to be assembled and tested are placed on the pallet 2. The transport device 1 transports the pallet 2 in the transport direction, temporarily fixes the pallet 2 for work at the pallet fixing position before the stopper 41, and transports the pallet 2 again in the transport direction.

  The transport device 1 rotates by driving a plurality of transport rollers 21a arranged in the transport direction, a plurality of transport rollers 21b arranged in the transport direction on the left side of the transport direction of the transport rollers 21a, and the transport rollers 21a and 21b. A transport roller driving unit 23 to be transported, and transport roller support units 22a and 22b that support the rotation shafts of the transport rollers 21a and 21b, respectively. The upper ends of all the transport rollers 21 a and 21 b are located in the transport surface 3. The rotation axis direction of the transport rollers 21a and 21b is the width direction of the transport path. All the conveyance rollers 21a and 21b have the same diameter. The transport rollers 21a and 21b are arranged at equal intervals. The conveyance roller support units 22a and 22b transmit the power of the conveyance roller driving unit 23 to the conveyance rollers 21a and 21b, respectively. The transport roller driving unit 23 rotates the transport rollers 21a and 21b, so that the pallet 2 placed on the transport surface 3 is transported in the transport direction. The conveyance roller drive unit 23 operates in accordance with an instruction from the control unit 61. The conveyance roller driving unit 23 is realized using a motor, for example. The conveyance roller support portions 22a and 22b are realized by using, for example, a gear and a chain that transmit the rotation of the motor to the conveyance rollers 21a and 21b.

  The conveying device 1 further includes guide rollers 71a, 71b, 72a, 72b that are rotating bodies, a guide roller unit 75 that supports the rotation shafts of the guide rollers 71a, 71b, 72a, 72b, and the guide roller unit 75 in the height direction. A unit driving unit 73 that moves the guide roller unit 75, and a unit detection unit 74 that detects the position of the guide roller unit 75. The unit driving unit 73 is realized using, for example, a pump and a hydraulic cylinder that moves in the height direction. The unit driving unit 73 operates in response to an instruction from the control unit 61.

  The guide rollers 71a, 71b, 72a, 72b are freely rotatable. A guide roller 71a is provided between the center in the width direction of the conveyance path and the conveyance roller 21a, and a guide roller 72a is provided on the conveyance direction side. Similarly, a guide roller 71b is provided between the center in the width direction of the conveyance path and the conveyance roller 21b, and a guide roller 72b is provided on the conveyance direction side. The rotation axes of the guide rollers 71a, 71b, 72a, 72b are parallel to the rotation axes of the transport rollers 21a, 21b. The diameters of the guide rollers 71a, 71b, 72a, 72b are equal. The diameters of the guide rollers 71a, 71b, 72a, 72b are preferably larger than the diameters of the transport rollers 21a, 21b.

  The conveyance device 1 further detects a position of the stopper 41 provided on the conveyance direction side of the guide rollers 72a and 72b, a stopper 41 movable in the height direction, a stopper driving unit 43 that drives and moves the stopper 41, and the stopper 41. And a stopper detector 44. The stopper driving unit 43 is realized using, for example, a pump and a hydraulic cylinder that moves in the height direction. The stopper driving unit 43 operates in response to an instruction from the control unit 61.

  The transport apparatus 1 further includes a pallet detection unit 31 provided between the guide rollers 72a and 72b and the stopper 41. The pallet detector 31 detects that the moving pallet 2 has reached the detection range. The detection range is located behind the stopper 41 in the conveyance direction. The palette detecting unit 31 is realized by using, for example, a light emitting unit and a light detecting unit that detects the reflected light. The palette detection unit 31 transmits the detection result to the control unit 61.

  The transport device 1 further includes a rotatable clamper 51 provided behind the guide rollers 71a and 71b in the transport direction, a clamper drive unit 53 that drives and moves the clamper 51, and a clamper detection unit that detects the position of the clamper 51. 54. The clamper driving unit 53 is realized using, for example, a motor and a gear. The clamper driving unit 53 operates in response to an instruction from the control unit 61.

  The transport apparatus 1 further includes a control unit 61 that controls each unit. The control unit 61 acquires detection results from the pallet detection unit 31, the stopper detection unit 44, the clamper detection unit 54, and the unit detection unit 74. The control unit 61 controls the transport roller driving unit 23, the stopper driving unit 43, the clamper driving unit 53, and the unit driving unit 73 based on the detection results. The control unit 61 includes, for example, a processor and a storage unit, and is realized by the processor executing a control program stored in the storage unit.

  Next, the pallet 2 will be described with reference to FIGS. 3, 4, and 5. 3 is a side view of the pallet 2, FIG. 4 is a bottom view of the pallet 2, and FIG. 5 is a cross-sectional view of the pallet 2 and the guide rollers 71a and 72a. This sectional view shows a section taken along line VV of the pallet 2 in FIGS. 2, 3, and 4.

  The external shape of the pallet 2 is a rectangular parallelepiped, for example. Of the bottom surface of the pallet 2, a base portion 81 b that is a horizontal plane is formed at the lowermost right end, and a base portion 81 a that is a horizontal plane is formed at the left end of the lowermost portion. The base portions 81a and 81b are placed on the transport rollers 21a and 21b, respectively, when the pallet 2 is transported, and are in contact with the transport surface 3.

  Further, on the bottom surface of the pallet 2, a guide groove 82a is formed between the center in the width direction of the transport path and the base portion 81a, and similarly, a groove is formed between the center in the width direction of the transport path and the base portion 81b. A guide groove 82b is formed. That is, the guide grooves 82a and 82b are formed in the bottom surface of the pallet 2 and at different positions in the width direction of the transport path with respect to the base portions 81a and 81b. The guide groove 82a is supported by guide rollers 71a and 72a when the pallet 2 is fixed. Similarly, the guide groove 82b is supported by the guide rollers 71b and 72b when the pallet 2 is fixed. That is, the guide grooves 82a and 82b are formed at the same position in the width direction of the transport path with respect to the guide rollers 71a and 72a, respectively.

  The guide groove 82a includes a flat surface portion 84a which is a horizontal surface formed from the rearmost portion of the guide groove 82a, a slope 85a which is a flat surface formed so as to be continuous in the transport direction and become higher in the transport direction, and the transport thereof. A flat portion 86a which is a horizontal plane formed continuously in the direction, and a slope 87a which is a flat surface formed up to the forefront portion of the guide groove 82a so as to be continuous in the conveyance direction and become higher in the conveyance direction. Similarly, the guide groove 82b includes a flat surface portion 84b that is a horizontal surface formed from the rearmost portion of the guide groove 82b, and a slope 85b that is a flat surface formed so as to be continuous in the transport direction and higher in the transport direction. A plane portion 86b that is a horizontal plane continuously formed in the conveyance direction, and a slope 87b that is a plane formed up to the forefront portion of the guide groove 82b so as to be continuous in the conveyance direction and become higher in the conveyance direction. .

As shown in FIG. 5, the angle formed by the conveyance surface 3 and the slope 85a and the angle formed by the conveyance surface 3 and the slope 87a are both θ _SL . That is, the slopes 85a and 87a are planes parallel to each other.

As shown in FIGS. 3 and 5, in this embodiment, the flat portions 84a, 84b, 86a, 86b and the slopes 85a, 85b, 87a, 87b are provided at positions higher than the base portions 81a, 81b. Further, as shown in FIG. 5, in this embodiment, the height of the flat portions 84a and 84b with reference to the transport surface 3 and the base portions 81a and 81b is H1, and the height of the flat portions 86a and 86b is H3. To do. In this case, H3 is higher than H1, the height of H3 relative to H1 and H _SL. Further, the height of the upper ends of the guide rollers 71a and 71b with respect to the conveying surface 3 is H2, and the height of the upper ends of the guide rollers 72a and 72b is H4. In this case, H4 is greater than H2, the height of H4 for H2 and H _SL. In other words, equal to the height of H4 to the height and H2 of H3 relative to H1, it is H _SL. As shown in FIG. 5, the relationship of H1, H2, H3, and H4 is expressed by H1 <H2 <H3 <H4. That is, the height of the lower ends of the slopes 87a and 87b is equal to or higher than the height of the upper ends of the slopes 85a and 85b. The height of the upper ends of the guide rollers 71a and 71b is within the height range of the slopes 85a and 85b. The height of the upper ends of the guide rollers 72a and 72b is within the height range of the slopes 87a and 87b.

  Next, a first operation example of the transport apparatus 1 will be described with reference to FIGS. The first operation example is an example in which the transport rollers 21a and 21b are stopped during work. FIG. 6 is a flowchart illustrating a first operation example of the transport device 1. FIG. 7 shows the initial state of the first operation example, FIG. 8 shows the state of S12 in the first operation example, FIG. 9 shows the state of S13 in the first operation example, and FIG. 11 shows the state of S15 in the first operation example, FIG. 11 shows the state of S17 in the first operation example, FIG. 12 shows the state of S25 in the first operation example, and FIG. 13 shows the state in the first operation example. FIG. 14 shows the state of S33 in the first operation example, FIG. 15 shows the state of S35 in the first operation example, and FIG. 16 shows the state of S39 in the first operation example. . 7 to 16 are cross-sectional views taken along line VV of the transport device 1 in FIG.

  First, as shown in FIG. 7, the guide roller unit 75 is positioned at the unit retracted position, the stopper 41 is positioned at the stopper retracted position, and the clamper 51 is positioned at the clamper retracted position. When the guide roller unit 75 is positioned at the unit retracted position, the guide rollers 71a and 72a are positioned below the transport surface 3 and do not interfere with the transport path. When the stopper 41 is positioned at the stopper retracting position, the stopper 41 is positioned below the transport surface 3 and does not interfere with the transport path. When the clamper 51 is positioned at the clamper retracting position, the clamper 51 is positioned below the transport surface 3 and does not interfere with the transport path. At this time, the pallet 2 exists at a position behind the guide roller 71a in the transport direction in the transport path.

  Next, the control unit 61 controls the unit driving unit 73 to move the guide roller unit 75 upward as shown in FIG. 8 (S11). Thereafter, the unit detector 74 detects that the guide roller unit 75 has reached the unit operating position. Upon receiving this detection result, the control unit 61 stops the unit driving unit 73. When the guide roller unit 75 is located at this unit operating position, the upper ends of the guide rollers 71a and 72a are located within the height ranges of the slopes 85a and 87a, respectively. As a result, the slopes 85a and 87a moving in the transport direction can contact the guide rollers 71a and 72a, respectively.

  Further, the control unit 61 controls the stopper driving unit 43 to move the stopper 41 upward (S12). Thereafter, the stopper detection unit 44 detects that the stopper 41 has reached the stopper operating position. Receiving this detection result, the control unit 61 stops the stopper driving unit 43. When the stopper 41 is located at this stopper operating position, the upper end of the stopper 41 is located in the transport path. Thereby, the stopper 41 can contact the pallet 2 moving in the transport direction.

  Next, the control unit 61 controls the transport roller driving unit 23 to rotate the transport roller 21a, so that the pallet 2 moves on the transport surface 3 in the transport direction as shown in FIG. 9 (S13). At this time, the pallet 2 does not contact the clamper 51. Further, the slope 87a and the flat portion 86a do not contact the guide roller 71a.

  Next, as shown in FIG. 10, when the pallet 2 is further conveyed in the conveying direction, the slopes 85a and 87a simultaneously contact the guide rollers 71a and 72a, respectively (S15). Here, the contact point between the guide groove 82a and the guide roller 71a is 76a, and the contact point between the guide groove 82a and the guide roller 72a is 77a.

  Next, as shown in FIG. 11, the slopes 85 a and 87 a move along the guide rollers 71 a and 72 a, respectively, due to the inertia of the pallet 2. As a result, the pallet 2 moves obliquely upward in the transport direction while maintaining horizontal (S17). As a result, the base portion 81a is separated from the transport roller 21a. At this time, the guide rollers 71a and 72a rotate as the slopes 85a and 87a move. Thereby, wear of slope 85a, 87a and the conveyance roller 21a can be prevented.

  Next, as shown in FIG. 12, the lower ends of the slopes 85a and 87a reach the guide rollers 71a and 72a due to the inertia of the pallet 2, respectively, and the flat portions 84a and 86a contact the guide rollers 71a and 72a, respectively. The flat portions 84a and 86a move in the transport direction while being supported by the upper ends of the guide rollers 71a and 72a, respectively. At this time, the guide rollers 71a and 72a rotate as the plane portions 84a and 86a move. Thereafter, when the pallet 2 reaches the detection range of the pallet detection unit 31 due to the inertia of the pallet 2, the pallet detection unit 31 detects the pallet 2 (S21). The signal 32 indicates a signal transmitted from the palette detection unit 31 and a signal obtained by reflecting the signal on the palette 2. Upon receiving this detection result, the control unit 61 controls the transport roller driving unit 23 to stop the transport roller 21a (S23). Next, the control unit 61 controls the clamper driving unit 53 to rotate the tip of the clamper 51 upward and move it to the clamper operating position (S25). When the clamper 51 is located at this clamper operating position, the upper end of the clamper 51 is located in the transport path. Thereby, the clamper 51 can contact the pallet 2.

  Next, as shown in FIG. 13, the clamper 51 pushes the rearmost part of the pallet 2 by continuing the rotation. Thereby, the foremost part of the pallet 2 is pressed against the stopper 41 (S27). At this time, the clamper detection unit 54 detects that the clamper 51 has reached the clamper operating position. Upon receiving this detection result, the control unit 61 stops the clamper driving unit 53. When the pallet 2 is positioned between the stopper 41 and the clamper 51, the stopper 41 is positioned at the stopper operating position, and the clamper 51 is positioned at the clamper operating position, the pallet 2 is fixed by being sandwiched between the stopper 41 and the clamper 51. Is done.

  Next, with the pallet 2 fixed as shown in FIG. 13, the worker performs an operation on the object on the pallet 2 (S31). When the work is finished, the worker inputs the work finish to the control unit 61.

  The control unit 61 to which the end of the work is input controls the clamper driving unit 53 to rotate the clamper 51 downward as shown in FIG. 14 (S33). Thereafter, the clamper detection unit 54 detects that the clamper 51 has reached the clamper retracted position. Upon receiving this detection result, the control unit 61 stops the clamper driving unit 53.

  Next, the control unit 61 controls the stopper driving unit 43 to move the stopper 41 downward as shown in FIG. 15 (S35). Thereafter, the stopper detector 44 detects that the stopper 41 has reached the stopper retracting position. Receiving this detection result, the control unit 61 stops the stopper driving unit 43.

  Further, the control unit 61 controls the unit driving unit 73 to move the guide roller unit 75 downward (S37). As the guide roller unit 75 is lowered, the base portion 81a comes into contact with the upper end of the transport roller 21a, and the flat portions 84a and 86a are separated from the guide rollers 71a and 72a, respectively. Thereafter, the unit detection unit 74 detects that the guide roller unit 75 has reached the unit retracted position. Upon receiving this detection result, the control unit 61 stops the unit driving unit 73.

  Next, the control unit 61 controls the transport roller driving unit 23 to rotate the transport roller 21a, thereby transporting the pallet 2 again in the transport direction as shown in FIG. 16 (S39).

  This flow is completed. The flow for carrying one pallet 2 is repeated for each of the plurality of pallets 2.

  Note that the order of S11 and S12 can be exchanged or can be performed simultaneously.

  In the first operation example, the order of S33, S35, and S37 may be exchanged or may be performed simultaneously.

In S15-S35, the distance in the conveying direction of the contact point 76a and the contact 77a is always L _G, the height direction of the distance of the contact point 76a and the contact 77a is always H _SL. That is, in S15 to S35, the pallet 2 is moved and fixed while the relative position between the contact 76a and the contact 77a is maintained. Thereby, the pallet 2 is always kept horizontal. If this condition is satisfied, the slopes 85a and 87a may be curved surfaces.

  In the description of the above flow, the base portion 81a, the guide groove 82a, the flat surface portion 84a, the slope 85a, the flat surface portion 86a, the slope 87a, and the guide rollers 71a and 72a located on the right side in the transport direction have been described. As is clear from this description, the base portion 81b, the guide groove 82b, the flat surface portion 84b, the slope 85b, the flat surface portion 86b, the slope 87b, and the guide rollers 71b and 72b, which are located on the left side in the transport direction, are also the same as the corresponding elements. Operate.

  Next, the relationship between the guide rollers 71a and 72a and the guide groove 82a will be described with reference to FIGS. FIG. 17 is a cross-sectional view of the upper portion of the guide roller 71a. This sectional view shows a section taken along line VV in FIG.

As shown in FIG. 17, the intersection of the flat surface 84c, which is an extended surface of the flat surface portion 84a, and the outer periphery of the guide roller 71a is 79a, the tangent line that contacts the outer periphery of the guide roller 71a is 78a, and the flat surface 84c and the tangent line 78a are The formed angle is θ _SLmax . Further, the upper end of the guide roller 71a relative to the plane 84c height, i.e. the (H2-H1) and H _D.

Further, as shown in FIG. 5, the length in the transport direction of the slope 85a and L _SL, the length in the conveying direction of the flat portion 86a and the L _F. Also, the boundary between the flat portion 84a and the slope 85a and 88a, and the boundary between the flat portion 86a and the slope 87a and 89a, the distance between the conveying direction between the guide roller 71a rotating shaft and the guide roller 72a rotating shaft and L _G. Here, L _G is equal to (L _SL + L _F ). Further, the length in the height direction of the slope 85a is H _SL as described above.

H _SL is limited so as to satisfy H _SL> H _D. If H _SL ≦ H _D , the flat portion 86a comes into contact with the guide roller 71a when the pallet 2 moves on the guide roller 71a. Also, θ _SL is limited to satisfy θ _SL <θ _SLmax . If θ _SL ≧ θ _SLmax , the guide roller 71a comes into contact with the pallet 2 for the first time at the boundary 88a. That is, the slope 85a does not function. Further, when H _SL is fixed and θ _SL is reduced, L _SL becomes longer. For this reason, if θ _SL is made too small, there arises a problem that the size of the pallet 2 becomes too large.

In accordance with these limitations, the guide rollers 71a, 71b, 72a, 72b and the guide grooves 82a, the dimension of the 82b example, the guide rollers 71a, 71b, 72a, 72b 30 mm in diameter φ of, 0.5 mm and H _D, the H _SL 1 mm, L _SL can be 7.5 mm, θ _SL can be 7.6 degrees, and θ _SLmax can be 14.8 degrees.

  According to the first operation example, since the pallet 2 is stopped after the base portions 81a and 81b are separated from the transport rollers 21a and 21b, respectively, wear of the pallet 2 and the transport rollers 21a and 21b can be reduced. it can.

  Next, a second operation example of the transport device 1 will be described. The second operation example is an example in which the transport rollers 21a and 21b are not stopped during work. FIG. 18 is a flowchart illustrating a second operation example of the transport device 1.

  In the second operation example, the process denoted by the same reference numeral as the process in the first operation example indicates the same or equivalent process as the process in the first operation example. First, S11-S21 similar to the first operation example is performed.

  Next, S23 is not performed, and S25 to S37 similar to those in the first operation example are performed while the transport rollers 21a and 21b are rotated. Here, when the base portions 81a and 81b come into contact with the upper ends of the transport rollers 21a and 21b, the pallet 2 is transported in the transport direction by the rotating transport rollers 21a and 21b. Next, S39 is not performed, and this flow ends.

  In the second operation example, the order of S33 and S35 can be exchanged or can be performed simultaneously.

  According to the second operation example, in the case where the pallet 2 needs to be fixed without stopping the rotation of the transport rollers 21a and 21b, wear of the pallet 2 and the transport rollers 21a and 21b can be reduced.

  The work object is, for example, a precision device such as a printed circuit board, a circuit module, or a disk drive. In this work, there is a case where a probe or an electrode is connected to an object to communicate with the object. If debris is generated due to wear, the debris may adhere to the probe or electrode, resulting in communication failure. According to the transport apparatus 1, such communication failures can be reduced by reducing wear of the pallet 2 and the transport rollers 21a and 21b.

  In addition, since the pallet 2 is always kept horizontal, the object can move stably. Further, since the pallet 2 is always kept horizontal, it is possible to prevent the object from vibrating due to the rising of the pallet 2. Thereby, the failure of the target object due to vibration can be prevented.

  In addition, the conveying apparatus 1 may convey the pallet 2 using a belt instead of the conveying rollers 21a and 21b.

  Further, the guide rollers 71a and 71b may be one or may be three or more. Further, the number of guide rollers 72a and 72b may be one or three or more. Further, the number of guide grooves 82a and 82b may be one or three or more.

  The guide grooves 82a and 82b may be provided outside the base portions 81a and 81b in the width direction of the transport path.

  Further, if the guide roller 71a, 72a supports the guide groove 82a and the base part 81a can be separated from the transport surface 3, the base part 81a and the guide groove 82a may be provided in another positional relationship. For example, a part or all of the guide groove 82a may be provided below the height of the base portion 81a. Correspondingly, a part or all of the upper ends of the guide rollers 71a and 72a may support the pallet 2 below the height of the transport surface 3.

Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A pallet transported by a conveyor, which is formed on a part of a bottom surface and supported by the conveyor, and a guide part formed at a different position in the width direction of the transport path with respect to the base part in the bottom surface A pallet having
A first roller disposed at the same position in the width direction with respect to the guide portion;
A second roller disposed at the same position in the width direction with respect to the guide portion and provided on the transport direction side from the first roller and having a diameter equal to the diameter of the first roller;
The guide portion is provided with a first slope formed so as to be higher in the transport direction, and a first slope provided on the transport direction side than the first slope and formed so as to be higher in the transport direction. 2 slopes,
The height of the lower end of the second slope is equal to or higher than the height of the upper end of the first slope,
The height of the upper end of the first roller is within the range of the height of the first slope,
The height of the upper end of the second roller is within the range of the height of the second slope,
A point in the first slope with respect to a first distance in the transport direction between the upper end of the first roller and the upper end of the second roller, and a second slope separated from the point by the first distance in the transport direction The second distance in the height direction between the inner point and the inner point is equal to the distance in the height direction between the upper end of the first roller and the upper end of the second roller.
(Appendix 2)
The guide portion further includes a first flat portion provided continuously from the first slope to the rear in the transport direction and parallel to the base portion and supported by the first roller, and the second slope. A second flat surface portion that is continuously provided rearward in the transport direction and is provided in parallel with the base portion and supported by the second roller;
The pallet support device according to appendix 1.
(Appendix 3)
Furthermore,
A driving unit that lowers the first roller and the second roller to separate the first roller and the second roller from the guide unit;
The pallet support device according to appendix 1.
(Appendix 4)
Furthermore,
A stopper that is provided closer to the transport direction than the second roller and stops the pallet in contact with the pallet moving in the transport direction;
A stopper driving unit that moves the stopper out of the conveyance path of the pallet;
Comprising
The pallet support device according to appendix 1.
(Appendix 5)
Furthermore,
A clamper that is provided on the rear side in the transport direction from the first roller and fixes the pallet by sandwiching the pallet between the stopper and the stopper that stopped the pallet;
A clamper driving unit that moves the clamper out of the conveyance path of the pallet;
Comprising
The pallet support device according to appendix 4.
(Appendix 6)
The first slope is a plane,
The second slope is a plane parallel to the first slope.
The pallet support device according to appendix 1.
(Appendix 7)
The guide part is provided at a position higher than the base part.
The pallet support device according to appendix 1.
(Appendix 8)
The guide part is a groove formed in the bottom surface.
The pallet support device according to appendix 7.
(Appendix 9)
A pallet transported by a conveyor, formed on a part of a bottom surface and supported by the conveyor, and formed in a position different in the width direction of the transport path with respect to the base portion in the bottom surface and in a transport direction A first roller provided at the same position in the width direction with respect to the guide portion in a state where a pallet having a guide portion formed so as to become higher toward the head is being conveyed in the conveyance direction by the conveyor. And a second roller provided at the same position in the width direction with respect to the guide portion and provided on the transport direction side from the first roller and having an upper end higher than the upper end of the first roller. Contact the part,
The base part is separated from the conveyor by moving the pallet obliquely upward in the transport direction while maintaining a relative position between the contact point of the first roller and the guide part and the contact point of the second roller and the guide part. A pallet support method comprising:

The conveyor is, for example, transport rollers 21a and 21b, transport roller support portions 22a and 22b, and a transport roller driving unit 23. The first rollers are, for example, guide rollers 71a and 71b. The second rollers are, for example, guide rollers 72a and 72b. The drive unit is, for example, a unit drive unit 73. The first slopes are, for example, slopes 85a and 85b. The first slopes are, for example, slopes 87a and 87b. The first distance is, for example, L _G. The second distance is, for example, _HSL . The first plane portion is, for example, the plane portions 84a and 84b. The second plane part is, for example, the plane parts 86a and 86b. The guide portions are, for example, guide grooves 82a and 82b.

DESCRIPTION OF SYMBOLS 1 Conveying device 2 Pallet 21a, 21b Conveying roller 22a, 22b Conveying roller support part 23 Conveying roller drive part 31 Pallet detection part 41 Stopper 43 Stopper drive part 44 Stopper detection part 51 Clamper 53 Clamper drive part 54 Clamper detection part 61 Control part 71a , 71b, 72a, 72b Guide roller 73 Unit drive part 74 Unit detection part 75 Guide roller unit 81a, 81b Base part 82a, 82b Guide groove 84a, 84b, 86a, 86b Flat part 85a, 85b, 87a, 87b Slope

Claims (6)

A pallet transported by a conveyor, which is formed on a part of a bottom surface and supported by the conveyor, and a guide part formed at a different position in the width direction of the transport path with respect to the base part in the bottom surface A pallet having
A first roller disposed at the same position in the width direction with respect to the guide portion;
A second roller disposed at the same position in the width direction with respect to the guide portion and provided on the transport direction side from the first roller and having a diameter equal to the diameter of the first roller;
The guide portion is provided with a first slope formed so as to be higher in the transport direction, and a first slope provided on the transport direction side than the first slope and formed so as to be higher in the transport direction. 2 slopes,
The height of the lower end of the second slope is equal to or higher than the height of the upper end of the first slope,
The height of the upper end of the first roller is within the range of the height of the first slope,
The height of the upper end of the second roller is within the range of the height of the second slope,
A point in the first slope with respect to a first distance in the transport direction between the upper end of the first roller and the upper end of the second roller, and a second slope separated from the point by the first distance in the transport direction The second distance in the height direction between the inner point and the inner point is equal to the distance in the height direction between the upper end of the first roller and the upper end of the second roller. The guide portion further includes a first flat portion provided continuously from the first slope to the rear in the transport direction and parallel to the base portion and supported by the first roller, and the second slope. A second flat surface portion that is continuously provided rearward in the transport direction and is provided in parallel with the base portion and supported by the second roller;
The pallet support device according to claim 1. Furthermore,
A driving unit that lowers the first roller and the second roller to separate the first roller and the second roller from the guide unit;
The pallet support device according to claim 1 or 2. Furthermore,
A stopper that is provided closer to the transport direction than the second roller and stops the pallet in contact with the pallet moving in the transport direction;
A stopper driving unit that moves the stopper out of the conveyance path of the pallet;
Comprising
The pallet support device according to any one of claims 1 to 3. Furthermore,
A clamper that is provided on the rear side in the transport direction from the first roller and fixes the pallet by sandwiching the pallet between the stopper and the stopper that stopped the pallet;
A clamper driving unit that moves the clamper out of the conveyance path of the pallet;
Comprising
The pallet support device according to claim 4. A pallet transported by a conveyor, formed on a part of a bottom surface and supported by the conveyor, and formed in a position different in the width direction of the transport path with respect to the base portion in the bottom surface and in a transport direction A first roller provided at the same position in the width direction with respect to the guide portion in a state where a pallet having a guide portion formed so as to become higher toward the head is being conveyed in the conveyance direction by the conveyor. And a second roller provided at the same position in the width direction with respect to the guide portion and provided on the transport direction side from the first roller and having an upper end higher than the upper end of the first roller. Contact the part,
The base part is separated from the conveyor by moving the pallet obliquely upward in the transport direction while maintaining a relative position between the contact point of the first roller and the guide part and the contact point of the second roller and the guide part. A pallet support method comprising:

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