JP2016113279A - Workpiece conveyance device and workpiece conveyance device maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece conveyance device capable of improving durability of a conveyance belt and a maintenance method thereof.SOLUTION: In a workpiece conveyance device 10, a conveyance surface 30M of a conveyance belt 30 driven by a servo motor 31 for driving a belt reciprocates between a workpiece supply position P0 and a first workpiece discharge position P1. At the workpiece supply position P0, a workpiece supply device 11 supplies a workpiece W on the conveyance surface 30M. At the first workpiece discharge position P1, a first workpiece discharge device 12A pushes and discharges the workpiece W in the width direction of the conveyance belt 30. In the workpiece conveyance device 10, when a belt displacement condition is established, the conveyance belt 30 is driven in the belt conveyance direction so that a workpiece placement part 40 on which the workpiece W is placed, of the conveyance surface 30M, is displaced between before and after the belt displacement condition is established.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a workpiece conveying apparatus that conveys a workpiece by a conveying belt and a maintenance method thereof.

  Conventionally, as this type of workpiece transfer device, a workpiece is supplied on the transfer surface of the transfer belt at the workpiece supply position, and after the workpiece is transferred to the workpiece discharge position in the belt transfer direction, the workpiece is discharged from the transfer surface. Those are known (for example, see Patent Document 1).

JP2011-11898 ([0043])

  By the way, in the above-described conventional workpiece transfer device, when the transfer surface of the transfer belt is reciprocated between the workpiece supply position and the workpiece discharge position, the workpiece is placed at the same position on the transfer surface. For this reason, there is a problem that the conveyor belt is easily worn and the durability of the conveyor belt is low.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a work transfer device and a maintenance method thereof capable of improving the durability of the transfer belt.

  In order to achieve the above object, a work conveying apparatus according to the invention of claim 1 includes a conveying belt and a belt drive control unit that drives and controls the conveying belt and reciprocates the conveying surface of the conveying belt in the belt conveying direction. A workpiece supply device that supplies a workpiece onto the conveyance surface when the conveyance surface reaches one end of the movable range, and a conveyance belt that transfers the workpiece on the conveyance surface when the conveyance surface reaches the other end of the movable range. The belt drive control unit is configured to place the workpiece on the conveyance surface when a preset belt shifting condition is satisfied. The workpiece mounting unit is characterized in that the conveying belt is driven in the belt conveying direction so as to be shifted between before and after the belt shifting condition is satisfied.

  According to a second aspect of the present invention, in the work transfer device according to the first aspect, the shift amount of the transfer surface by the belt drive control unit is such that the entire area of the work placing unit before the belt shift condition is satisfied is the belt shift condition. It is characterized in that it is set so as not to overlap with the workpiece placement section after the formation.

  The invention of claim 3 is characterized in that, in the workpiece transfer apparatus according to claim 1 or 2, the belt shifting condition is that the power of the belt drive control unit is turned on.

  According to a fourth aspect of the present invention, in the work transfer device according to any one of the first to third aspects, the work supply device is configured such that the transfer surface also moves when the transfer surface reaches the other end of the movable range. The workpiece is supplied upward, and the workpiece discharge device has a first workpiece discharge device that discharges the workpiece when the transport surface reaches the other end of the movable range, and is opposite to the first workpiece discharge device across the workpiece supply device. And a second workpiece discharging device that is disposed on the side and discharges the workpiece when the conveying surface reaches one end of the movable range.

  According to a fifth aspect of the present invention, there is provided a work conveying apparatus maintenance method, wherein the conveying surface of the conveying belt is reciprocated in the belt conveying direction, and the workpiece is supplied onto the conveying surface when the conveying surface reaches one end of the movable range. At the same time, when the conveying surface reaches the other end of the movable range, a maintenance method for the workpiece conveying device that pushes and discharges the workpiece on the conveying surface in the width direction of the conveying belt, and a preset belt shifting condition is established. In this case, the conveyance belt is shifted in the belt conveyance direction so that the workpiece placement portion on the conveyance surface where the workpiece is placed is displaced before and after the belt shift condition is established.

[Inventions of Claims 1, 2, 5]
In the present invention, when the belt shifting condition is satisfied, the conveying belt is shifted in the belt conveying direction so that the workpiece placing portion on the conveying surface where the workpiece is placed is displaced before and after the belt shifting condition is established. Thereby, it is possible to suppress the work from being placed on the same place on the conveyance surface of the conveyance belt, and it is possible to improve the durability of the conveyance belt by suppressing wear of the conveyance belt.

  Here, the shift amount of the transport surface may be set so that only a part of the workpiece mounting portion that is particularly easily worn does not overlap before and after the belt shift condition is satisfied. As described above, it may be set so that the entire area of the workpiece placement unit before the belt shifting condition is satisfied does not overlap the workpiece placement unit after the belt shifting condition is established. According to the second aspect of the present invention, the work placing portions do not overlap at all before and after the belt shifting condition is established, and the durability of the transport belt is improved.

[Invention of claim 3]
According to the invention of claim 3, since shifting is performed before the first workpiece is placed on the conveying surface of the conveying belt, the belt shifting condition is satisfied when the workpiece is placed on the conveying surface. This eliminates the need to remove the workpiece on the transfer surface.

[Invention of claim 4]
According to invention of Claim 4, since the workpiece | work supplied from one workpiece | work supply apparatus is discharged | emitted by two different workpiece | work discharge apparatuses, distribution of a workpiece | work becomes possible.

The top view of the workpiece conveyance apparatus which concerns on 1st Embodiment of this invention. Front view of workpiece transfer device Block diagram showing electrical configuration of work transfer device Flow chart of processing executed by control unit (A) Plan view of the transport belt when the first work is supplied, (B) Plan view of the transport belt moving in the first direction, (C) Transport belt when the first work is discharged Top view of (A) A plan view of the transport belt when the second work is supplied, (B) a plan view of the transport belt moving in the second direction, (C) a transport belt when the second work is discharged. Top view of (A) Side view of conveyance belt before belt shifting process, (B) Side view of conveyance belt after belt shifting process The flowchart of the process which the control part of the workpiece conveyance apparatus which concerns on 2nd Embodiment of this invention performs. The flowchart of the process which the control part of the workpiece conveyance apparatus which concerns on 3rd Embodiment of this invention performs. Sectional drawing of the conveyance belt which concerns on a modification (A) Side view of the conveyor belt before the belt shifting process, (B) Side view of the conveyor belt after the belt shifting process according to the modified example In the workpiece transfer apparatus according to the modification, (A) a plan view of the transfer belt when the first workpiece is supplied, (B) a plan view of the transfer belt being moved to the workpiece discharge position, and (C) a second view. Plan view of the conveyor belt when the workpiece is supplied (A) a plan view of the conveyor belt before the belt shifting process according to the modification, (B) a plan view of the conveyor belt after the belt shifting process

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the workpiece conveyance device 10 of this embodiment includes a workpiece supply device 11, a conveyance belt 30, and a workpiece discharge device 12. The conveyor belt 30 is stretched between a drive pulley 35A and an idle 35B arranged side by side. The drive pulley 35A is attached to an output shaft 32J of a speed reducer 32 connected to a belt driving servo motor 31. ing. When the driving pulley 35A rotates in response to the driving force of the belt driving servomotor 31, the conveying surface 30M formed on the upper surface of the conveying belt 30 moves between the driving pulley 35A and the idle pulley 35B. A work conveyance path 90 that extends linearly in the lateral direction is formed by the conveyance surface 30 </ b> M of the conveyance belt 30. In the present embodiment, the belt driving servomotor 31 rotates in both forward and reverse directions, and the conveyance surface 30M reciprocates along the workpiece conveyance path 90.

  Specifically, as shown in FIG. 2, a pair of auxiliary pulleys 36 and 36 are transported between the drive pulley 35A and the idle pulley 35B between the drive pulley 35A and the idle pulley 35B. It arrange | positions so that the lower part of the belt 30 may be lifted from the downward direction. The tension of the conveyor belt 30 can be adjusted by adjusting the height of the pair of auxiliary pulleys 36 and 36.

  Further, the conveyance belt 30 is disposed so as to sandwich the base table 15 vertically. A magnet 16 is attached to the base table 15 over the entire workpiece conveyance path 90, and the magnetic force of the magnet 16 attracts the workpiece W on the conveyance surface 30M toward the base table 15 (ie, downward). It has become.

  The workpiece supply device 11 cuts out the workpiece W into a predetermined size and intermittently supplies the workpiece W to the workpiece conveyance path 90. Specifically, as shown in FIG. 1, the workpiece supply device 11 is disposed on one side in the width direction of the workpiece conveyance path 90 (upper side when FIG. 1 is viewed sideways), and is intermediate between the workpiece conveyance paths 90. The workpiece W is placed on the conveyance surface 30M of the conveyance belt 30 at the position. In the following, the directions in FIGS. 1, 2, and 5 to 7 are directions when the drawings are viewed sideways unless otherwise specified.

  As shown in FIG. 1, the workpiece discharge device 12 is arranged side by side with the workpiece supply device 11 on one side in the width direction of the workpiece conveyance path 90 (upper side in FIG. 1). In the present embodiment, the workpiece discharge devices 12 are provided in pairs so as to sandwich the workpiece supply device 11. In the following, the right-hand work discharge device 12 in FIG. 1 will be referred to as a first work discharge device 12A, and the left-hand work discharge device 12 will be referred to as a second work discharge device 12B as appropriate.

  The first workpiece discharge device 12 </ b> A includes a movable shaft 22 that is driven by the piston 21 to reciprocate in the direction across the workpiece conveyance path 90, that is, in the width direction of the conveyance belt 30. A pressing plate 23 is fixed to the distal end portion of the movable shaft 22. Then, the pressing plate 23 presses the workpiece W on the conveyance surface 30 </ b> M to the other side in the width direction of the workpiece conveyance path 90 (the lower side in FIG. 1), thereby discharging the workpiece W to the side of the workpiece conveyance path 90. .

  Since the configuration of the second workpiece discharge device 12B is the same as that of the first workpiece discharge device 12A, description thereof is omitted by attaching the same reference numerals. Here, in the direction in which the workpiece conveyance path 90 extends (the direction in which the conveyance belt 30 extends), the position at which the workpiece supply device 11 supplies the workpiece W is “work supply position P0”, and the first workpiece discharge device 12A has the workpiece W. The discharge position P1 is appropriately referred to as “first discharge position P1”, and the position P2 at which the second workpiece discharge device discharges the workpiece W is referred to as “second discharge position P2” as appropriate. Note that the distance from the workpiece supply position P0 to the first discharge position P1 is the same as the distance from the workpiece supply position P0 to the second discharge position P2. The direction from the workpiece supply position P0 to the first workpiece discharge position P1 is appropriately referred to as “first direction”, and the direction from the workpiece supply position P0 to the second workpiece discharge position P2 is appropriately referred to as “second direction”. To.

  As shown in FIG. 1, a workpiece contact extending along the workpiece conveyance path 90 is provided on the opposite side of the workpiece conveyance path 90 (conveyance belt 30) from the first workpiece ejection device 12A and the second workpiece ejection device 12B. A wall 25 is provided. The workpiece contact wall 25 is in contact with the workpiece W discharged from the workpiece transfer path 90 by the first workpiece discharge device 12A or the second workpiece discharge device 12B, and is formed between the workpiece transfer path 90 and the contact wall 25. The discharged work collection port 26 is discharged.

  FIG. 3 shows an electrical configuration of the workpiece transfer apparatus 10. Reference numeral 50 shown in the figure is the control unit 50 of the workpiece transfer apparatus 10. The control unit 50 communicates with the workpiece supply device 11, the first workpiece ejection device 12A, the second workpiece ejection device 12B, and the belt driving servo motor 31, and controls these devices and the servo motors 11, 12A, 12B, 31. Each workpiece discharge device 12A, 12B is provided with a piston control unit 55A, 55B and a piston drive unit 56A, 56B. The piston control unit 55A, 55B receives a control signal from the control unit 50 and receives a piston. The drive units 56A and 56B are driven. When the piston driving portions 56 </ b> A and 56 </ b> B are driven, the above-described movable shaft 22 reciprocates in the width direction of the conveyor belt 30.

  FIG. 4 shows a main program PG1 that is executed by the control unit 50 when the workpiece transfer apparatus 10 is activated. As shown in the figure, in the main program PG1, first, initial setting (S11) is performed. Subsequently, the workpiece | work W is supplied on the conveyance surface 30M of the conveyance belt 30 via the workpiece | work supply apparatus 11 (S12).

  When the work W is supplied to the transport belt 30, the transport belt 30 is moved in the first direction via the belt driving servo motor 31, and the work W is moved to the first discharge position P1 (S13). Next, the workpiece W is discharged via the first workpiece discharge device 12A, and in this state, a new workpiece W is supplied onto the conveyor belt 30 (S14).

  Next, the conveyor belt 30 is moved in the second direction, and the workpiece W is moved to the second discharge position P2 (S15). Then, the second work W is discharged via the second work discharge device 12B, and a new work W is supplied onto the conveyor belt 30 (S16). Thereafter, steps S13 to S16 are repeatedly executed.

  5 and 6 show the flow of the work W transported by the work transport device 10. Specifically, when step S12 in the main program PG1 shown in FIG. 4 is executed, the first work is placed on the transport surface 30M of the transport belt 30 at the work supply position P0 as shown in FIG. 5A. W1 (hereinafter referred to as “first work W1”) is supplied. Next, when step S13 in FIG. 4 is executed, the first work W1 is transported in the first direction by the transport belt 30 (see FIG. 5B), and the first work W1 reaches the first discharge position P1. . When step S14 in FIG. 4 is executed, the first work discharge device 12A discharges the first work W1 (see FIG. 5C), and the second work W2 (hereinafter, “ The second workpiece W2 ”is supplied onto the conveyance surface 30M of the conveyance belt 30 (see FIG. 6A).

  Next, when step S15 of FIG. 4 is executed, the second work W2 is transported in the second direction by the transport belt 30 (see FIG. 6B), and the second work W2 reaches the second discharge position P2. . Then, when step S16 of FIG. 4 is executed, the second work discharging device 12B discharges the second work W2 (see FIG. 6C), and the work supplying device 11 is the third work (not shown). Is supplied onto the conveying surface 30M of the conveying belt 30.

  Here, as described above, the distance from the workpiece supply position P0 to the first workpiece discharge position P1 and the distance from the workpiece supply position P0 to the second workpiece discharge position P2 are the same. ) To 6C, the distance that the conveyance surface 30M moves in the second direction is the same as the distance that the conveyance surface 30M moves in the first direction in the flows of FIGS. 5A to 5C. It has become. Accordingly, the third work (not shown) is placed on the first work placing portion 41 on which the first work W1 is placed on the transport belt 30 (see FIG. 5A). Similarly, a fourth work (not shown) is placed on the second work placement portion 42 (see FIG. 6A) on which the second work W2 is placed on the transport belt 30. Is done. In the present embodiment, the first workpiece placement unit 41 and the second workpiece placement unit 42 constitute a workpiece placement unit 40 on which the workpiece W is placed on the transfer surface 30M.

  The above is the description regarding the flow of conveyance of the workpiece W by the workpiece conveyance device 10. As described above, in the workpiece conveyance device 10 of the present embodiment, the conveyance belt 30 reciprocates between the position illustrated in FIG. 5A and the position illustrated in FIG. The workpiece W thus discharged is discharged by the first workpiece discharge device 12A and the second workpiece discharge device 12B. According to the work transfer device 10, the work W supplied from the work supply device 11 can be distributed. In this embodiment, the position of the conveyance surface 30M shown in FIG. 5A corresponds to “one end of the movable range of the conveyance surface” of the present invention, and the position of the conveyance surface 30M shown in FIG. This corresponds to “the other end of the movable range of the conveying surface” of the invention. In FIG. 1, three movable shafts 22 of the workpiece discharge devices 12 </ b> A and 12 </ b> B are shown. However, in FIGS. 5 and 6, only the middle movable shaft 22 is shown, and the remaining two are omitted. ing.

  By the way, in the workpiece conveyance apparatus 10, as described above, the workpiece W is placed on the same portion of the conveyance belt 30, that is, the workpiece placement unit 40 (the first workpiece placement unit 41 and the second workpiece placement unit 42). Placed. And since the workpiece | work discharge apparatus 12 pushes the workpiece | work W to the width direction of the conveyance belt 30 when discharging | emitting the workpiece | work W, the problem that only the specific location of the conveyance belt 30 wears out arises. In order to solve such a problem, in the workpiece conveyance device 10 of the present embodiment, the control unit 50 (see FIG. 3) executes the belt shifting process described below, so that the maintenance of the workpiece conveyance device 10 is automatically performed. To be done.

  The belt shifting process is executed when a preset belt shifting condition is satisfied. In the present embodiment, the belt shifting condition is that the power of the workpiece transfer device 10 is turned on, and the control unit 50 (see FIG. 3) performs belt shifting processing in the initial setting (step S11 in FIG. 4). Execute. In the belt shifting process, the belt driving servomotor 31 is arranged so that the part on which the work W is placed on the conveying surface 30M, that is, the work placing part 40 is displaced before and after the belt shifting condition is established. Controls the driving of the conveyor belt 30. In the embodiment, the control unit 50 and the belt driving servomotor 31 correspond to the “belt driving control unit” of the present invention.

  When the belt shifting process is executed, as shown in the change from FIG. 7A to FIG. 7B, the transport surface 30M of the transport belt 30 moves in the first direction (FIGS. 7A and 7B). ) To the right)) by a distance L1. Then, the old belt placement portion 40P on which the workpiece W is placed before the belt shifting condition is satisfied is shifted by the distance L1 in the first direction. The shift amount L1 is larger than the length of the old belt placing portion 40P in the extending direction of the transport belt 30. Accordingly, as shown in FIG. 7B, the new belt placement portion 40N on which the workpiece W is placed after the belt shifting condition is satisfied does not overlap the entire area of the old belt placement portion 40P. Yes. In the example of FIGS. 7A and 7B, one of the first work placement unit 41 and the second work placement unit 42 (see FIGS. 5 and 6) is placed. Part 40 is shown.

  As described above, in the workpiece transfer device 10 and the maintenance method thereof according to the present embodiment, when the belt shifting process is executed, the workpiece placement in which the workpiece W is placed between before and after the execution of the process. The conveyance surface 30M is displaced in the belt conveyance direction so that the portion 40 (the first workpiece placement unit 41 and the second workpiece placement unit 42) is displaced. Thereby, it is possible to suppress the work W from being placed at the same place on the conveyance surface 30M of the conveyance belt 30, and to suppress wear of the conveyance belt 30 and to improve the durability of the conveyance belt 30.

  In the present embodiment, the belt shifting condition is set when the power of the work transfer device 10 is turned on, so that the transfer is performed before the first work W1 is placed on the transfer surface 30M of the transfer belt 30. The belt 30 can be shifted, and it is not necessary to remove the workpiece W on the conveyance surface 30M compared to the case where the shifting condition is satisfied in a state where the workpiece is placed on the conveyance surface 30M.

  In the example of FIGS. 7A and 7B, the direction in which the conveyor belt 30 is shifted is the first direction, but it may be fixed in either the first direction or the second direction. . Further, as shown in FIGS. 5 and 6, the workpiece placement unit 40 (the first belt placement unit 41 and the second belt placement unit 42) is located at a position where the workpiece W is supplied by the workpiece supply device 11. Considering the error, it is slightly longer than the width of the workpiece W.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is different from the first embodiment in the program executed by the control unit 50 (see FIG. 3 of the first embodiment) of the workpiece transfer apparatus 10.

  FIG. 8 shows a main program PG2 executed by the control unit 50 of the present embodiment. In the main program PG2, first, as in the first embodiment, initial setting (S21) is performed. However, this initial setting (S21) is different from the first embodiment in that the belt shifting process is not executed.

  When the initial setting is completed, processing similar to steps S12 to S15 of the main program PG1 of the first embodiment is executed. Specifically, the workpiece W is supplied onto the conveying surface 30M of the conveying belt 30 (S22), the conveying belt 30 is driven, and the workpiece W is conveyed to the first discharge position P1 (S23). Next, the workpiece W is discharged by the first workpiece discharge device 12A, and a new workpiece W is supplied at the workpiece supply position P0 (S24). Next, the new work W is transported to the second discharge position P2 (S25), and the work W is discharged by the second work discharge device 12B (S26). In addition, the flow of the conveyance of the workpiece | work W when the control part 50 is performing steps S22-S26 is the same as that of FIG. 5 (A)-FIG. 6 (C) of the said 1st Embodiment.

  When step S26 ends, it is determined whether or not the continuous operation time of the workpiece transfer apparatus 10 is equal to or longer than a predetermined time (for example, 8 hours) (S27). If continuous operation time is less than regulation time (it is No at S27), it will return to Step S22. On the other hand, if the continuous operation time is equal to or longer than the specified time (Yes in S27), the belt shifting process (S28) is executed, and then the process returns to Step S22. The belt shifting process (S28) is similar to the process performed in the initial setting (S11) of the first embodiment, and before and after the execution of the belt shifting process, the workpiece placement unit on the transport surface 30M. The belt driving servomotor 31 controls the driving of the conveying belt 30 so that the distance 40 is deviated (see FIG. 7 of the first embodiment).

  The above is the description of the main program PG2 executed by the control unit 50 in the present embodiment. As described above, in this embodiment, the continuous operation time of the workpiece transfer device 10 being equal to or longer than the specified time corresponds to the “belt shifting condition” of the present invention. In step S27, whether or not the belt shifting condition is satisfied. Has been determined. Also according to the present embodiment, it is possible to achieve the same effect as the first embodiment.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. Similarly to the second embodiment, the present embodiment also differs from the first embodiment in the program executed by the control unit 50 of the workpiece transfer apparatus 10 (see FIG. 3 of the first embodiment).

  FIG. 9 shows a main program PG3 executed by the control unit 50 of the present embodiment. In the main program PG3, first, as in the first embodiment, initial setting (S31) is performed. However, this initial setting (S31) is different from the first embodiment in that the belt shifting process is not executed.

  When the initial setting is completed, processing similar to steps S12 to S16 of the main program PG1 of the first embodiment is executed. Specifically, the workpiece W is supplied onto the conveying surface 30M of the conveying belt 30 (S32), and the conveying belt 30 is driven to convey the workpiece W to the first discharge position P1 (S33). Next, the workpiece W is discharged by the first workpiece discharge device 12A, and a new workpiece W is supplied at the workpiece supply position P0 (S34). Next, the new work W is conveyed to the second discharge position P2 (S35), and the work W is discharged by the second work discharge device 12B (S36). In addition, the flow of the conveyance of the workpiece | work W when the control part 50 is performing step S32-S36 is the same as that of FIG. 5 (A)-FIG. 6 (C) of the said 1st Embodiment.

  When step S36 is completed, it is determined whether or not the number of reciprocations of the conveyor belt 30 has reached a predetermined number of times (S37). If the number of reciprocations has not reached the specified number (No in S37), the process returns to step S32. On the other hand, if the number of reciprocations has reached the specified number (Yes in S37), the belt shifting process (S38) is executed, and the process returns to step S32. The belt shifting process (S38) is similar to the process performed in the initial setting (S11) of the first embodiment, and before and after the execution of the belt shifting process, the workpiece placement unit on the transport surface 30M. The belt driving servomotor 31 controls the driving of the conveying belt 30 so that the distance 40 is deviated (see FIG. 7 of the first embodiment). When the belt shifting process (S38) is executed, the number of reciprocations of the conveyor belt 30 is reset to zero.

  The above is the description of the main program PG3 executed by the control unit 50 in the present embodiment. As described above, in the present embodiment, the number of reciprocations of the conveying belt 30 reaching the specified number corresponds to the “belt shifting condition” of the present invention. In step S37, it is determined whether or not the belt shifting condition is satisfied. It has been judged. Also according to the present embodiment, it is possible to achieve the same effect as the first embodiment. Note that the prescribed number of times may be one or a plurality of times.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) The shape of the workpiece W may be a shape having legs WK and WK side by side in the extending direction of the conveyor belt 30 as shown in FIG. In this case, the workpiece placing unit 40 is composed of the leg placing units 40K and 40K. The shift amount L3 of the transport belt 30 only needs to be larger than the length L2 of the leg mounting portion 40K in the belt transport direction. In FIG. 10, the old leg placement portions 40KP and 40KP before the belt shifting process are indicated by a two-dot chain line.

  (2) As shown in the change from FIG. 11 (A) to FIG. 11 (B), the shift amount L4 of the conveyor belt 30 is only for a partial region of the old work placement part 40P and the new work placement part 40N. May be set so that they do not overlap before and after the belt shift condition is satisfied, and the shift amounts L1 and L3 of the conveyor belt 30 are set to the old work placement portion 40P as in the above embodiment and (1). Is set to a distance that does not overlap with the new workpiece placement unit 40N, the workpiece W is not placed on the same portion of the conveyance surface 30M before and after the belt shifting condition is established, and the conveyance belt 30 Durability is improved.

  (3) Like the workpiece transfer device 10V shown in FIG. 12, the workpiece supply device 11 includes the first workpiece supply device 11A and the second workpiece supply device 11B, and the first workpiece supply device 11A and the second workpiece supply. A configuration may be adopted in which the workpiece discharge device 12 is provided between the devices 11B, and the conveyor belt 30 reciprocates between the first workpiece supply device 11A and the second workpiece supply device 11B. Specifically, the first workpiece placement unit 40A, on which the workpiece WA supplied from the first workpiece supply device 11A is placed, reciprocates between the first workpiece supply position PA and the workpiece discharge position P3, and the second The second workpiece placement unit 40B on which the workpiece WB supplied from the workpiece supply device 11B is placed reciprocates between the second workpiece supply position PB and the workpiece discharge position P3. Note that the change from FIG. 12 (A) to FIG. 12 (B) to FIG. 12 (C) shows how the workpiece WA moves from the first workpiece supply position PA to the workpiece discharge position P3. According to the workpiece transfer device 10V of this configuration, the workpieces WA and WB supplied from two different workpiece supply devices (the first workpiece supply device 11A and the second workpiece supply device 11B) can be collected.

  (4) As shown in the change from FIG. 13 (A) to FIG. 13 (B), the shift amount L5 of the conveyor belt 30 is the first direction of the old first work placement part 41P in the old work placement part 40P. (Right direction in FIGS. 13 (A) and 13 (B)) side and second direction (left direction in FIGS. 13 (A) and 13 (B)) side of the old second work placement part 42P side It may be set longer than the distance L6 between the end portions of the two. Also with this configuration, the new workpiece placement unit 40N (new first workpiece placement unit 41N and new second workpiece placement unit 42N) and the old workpiece placement unit 40P are completely overlapped before and after the belt shifting condition is established. Therefore, the durability of the conveyor belt 30 can be improved. In this configuration, even if the belt shifting condition is satisfied a plurality of times, the workpiece W is placed on the same portion of the conveying belt 30 until the shifting amount L5 of the conveying belt 30 exceeds the length of one turn of the conveying belt 30. Since it is not placed, the durability of the conveyor belt 30 is further improved.

  (5) In the above embodiment, the control unit 50 of the workpiece transfer device 10 automatically performs maintenance of the transfer belt 30 by executing the belt shifting process. However, the transfer surface 30M of the transfer belt 30 is manually operated. Maintenance may be performed by shifting.

DESCRIPTION OF SYMBOLS 10 Work conveyance apparatus 11 Work supply apparatus 12 Work discharge apparatus 12A 1st work discharge apparatus 12B 2nd work discharge apparatus 30 Conveyance belt 30M Conveyance surface 31 Servo motor for belt drive 40 Work placement part 41 First work placement part 42 First 2 Work place 50 Control part W Work

Claims (5)

A conveyor belt;
A belt drive control unit that drives and controls the transport belt and reciprocates the transport surface of the transport belt in a belt transport direction;
A workpiece supply device for supplying a workpiece onto the conveyance surface when the conveyance surface reaches one end of the movable range;
A workpiece discharge device comprising: a workpiece discharge device that discharges the workpiece by pushing the workpiece on the transfer surface in the width direction of the transfer belt when the transfer surface reaches the other end of the movable range;
The belt drive control unit is configured such that when a preset belt shifting condition is satisfied, a workpiece placement unit on which the workpiece is placed on the transport surface is set before and after the belt shifting condition is established. The workpiece conveying apparatus, wherein the conveying belt is driven in the belt conveying direction so as to be shifted between the two.   The amount of shift of the transport surface by the belt drive control unit is such that the entire area of the workpiece mounting unit before the belt shifting condition is satisfied does not overlap the workpiece mounting unit after the belt shifting condition is satisfied. The workpiece transfer apparatus according to claim 1, wherein the workpiece transfer apparatus is set.   The work conveying apparatus according to claim 1, wherein the belt shifting condition is that a power source of the belt drive control unit is turned on. The workpiece supply device supplies the workpiece onto the conveyance surface even when the conveyance surface reaches the other end of the movable range,
The workpiece discharge device includes a first workpiece discharge device that discharges the workpiece when the transfer surface reaches the other end of the movable range, and a side opposite to the first workpiece discharge device across the workpiece supply device. 4. A second work discharge device that is disposed and discharges the work when the transport surface reaches one end of the movable range. 5. The workpiece transfer apparatus according to item. The transport surface of the transport belt is reciprocated in the belt transport direction, and when the transport surface reaches one end of the movable range, a workpiece is supplied onto the transport surface, and the transport surface reaches the other end of the movable range. When the work is carried out, a maintenance method for a work transport device that pushes and discharges the work on the transport surface in the width direction of the transport belt,
When the belt shifting condition set in advance is satisfied, the conveying belt is moved so that a workpiece placing portion on which the workpiece is placed on the conveying surface is displaced before and after the belt shifting condition is established. A work conveying apparatus maintenance method characterized by shifting in a belt conveying direction.

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