JP7539131B2 - Workpiece processing method and workpiece processing device - Google Patents

Description

The present invention relates to a work processing method and work processing device that performs a predetermined process on a work by using a work unit mounted on a follower unit that moves back and forth between a start point and an end point of movement in a predetermined processing area provided on the work transport path of a conveyor, and causes the work unit to follow and synchronize with the work transported on the work transport path.

Conventionally, line-type packaging machines such as air cleaners that clean containers to be filled with liquid, filling machines that fill containers with liquid, and cappers that attach caps to containers already filled with liquid have used work processing equipment equipped with a work transport means that transports the containers using a conveyor that can hold the containers as work, and a working unit that incorporates processing means such as a cleaning head, a filling head, and a cap chuck, and that performs each process such as cleaning, filling, and capping while following and synchronizing with the containers transported on the conveyor in a predetermined processing area provided on the container transport path of the conveyor (see Patent Document 1).

A specific example of the configuration of the workpiece transport means is a configuration in which a top chain, on which holding and transporting members for holding the workpieces are attached at equal intervals to a belt member formed into a ring by connecting individual belt members, is hung between a pair of sprockets, and the top chain is supported by a guide rail arranged along the transport path and driven by a servo motor to transport the workpieces held by the workpiece holding and transporting members to a predetermined processing area (whether intermittently or continuously) (see Patent Document 2).

An example of a specific configuration of the follow-up processing means is a configuration in which a work unit transport path is arranged over an appropriate length range parallel to the container transport path of the conveyor, and a servo motor is driven to move the work unit from the start position of the work unit transport path to the end position thereof in a manner following the container transport operation of the conveyor, and a follow-up processing operation in which the work unit corresponding to the container is synchronized with the container transport operation of the conveyor to perform a predetermined process, and after the follow-up operation is stopped at the end position of the work unit transport path, a return operation in which the servo motor is driven to return the work unit to the start position of the work unit transport path is repeated alternately (see Patent Document 1).

JP 2003-104490 A Japanese Patent Application Publication No. 10-202479

However, in workpiece processing equipment such as those described above, the conveyor of the workpiece transport means may stretch or slacken in the direction of transport of the workpiece. For example, when a top chain made up of connected individual belt members is used as a conveyor as described above, the weight of the workpiece may cause the connection parts of the belt members to bend. Also, in workpiece processing equipment that fills a container as the workpiece with a filling liquid heated to a high temperature, the heat of the filling liquid may cause the conveyor such as the top chain to expand.

When the length of the conveyor increases due to such loosening or thermal expansion, the transport pitch of the workpieces, which should be transported at equal intervals by the conveyor, naturally fluctuates as well. This causes a discrepancy between the position of the workpieces being transported during the following processing operation and the position of the working unit that moves following the container transport operation of the conveyor, and sometimes prevents the working unit from performing the specified processing properly.

In the past, to address this issue, it was necessary to visually check the extension of the conveyor and change the settings of the servo motor, which acts as the drive source for the start and end positions of the work unit of the tracking processing means on the work unit transport path. Furthermore, when making such changes, the device itself had to be restarted in order to position the work unit at the new start position, and at that time, any work being transported on the conveyor had to be manually removed, resulting in problems such as a decrease in the work efficiency of the entire work processing device.

The present invention has been made in consideration of these problems, and its purpose is to provide a work processing method and work processing device that can automatically and continuously correct the position of the working unit relative to the work transport path when the length of the conveyor of the driven work transport means changes, thereby aligning the working unit with the work transported on the conveyor.

In order to achieve the above-mentioned object, the present invention provides a work processing method, which comprises: a predetermined processing area provided on a work transport path of a conveyor having attachments disposed at equal intervals; a follower unit having an operational unit mounted thereon is moved back and forth between a movement start point and a movement end point, and the operational unit is made to follow and synchronize with a work transported on the work transport path, while performing a predetermined processing on the work using the operational unit;
Adjacent attachments arranged at equal intervals on the conveyor are detected by an extension/contraction detection means arranged upstream of the movement start point on the work transport path;
The system is characterized in that the time interval between the attachments is calculated from the detection result of the expansion/contraction detection means, the amount of expansion/contraction of the conveyor is determined from the difference with a preset reference time interval, and control is performed to correct the position of the working unit relative to the work transport path when the following unit returns to the starting point of movement based on a correction amount corresponding to the amount of expansion/contraction.

According to the workpiece processing method of the present invention, when the length of the conveyor of the workpiece transport means changes, the position of the workpiece transport path of the workpiece can be automatically and continuously corrected to align it with the workpiece being transported on the conveyor.

The work processing device of the present invention is a device for executing the above-mentioned work processing method, comprising: work transport means for transporting workpieces by arranging attachments at equal intervals on an upper surface of a conveyor on which attachments are arranged at equal intervals in the traveling direction; an operating unit for performing a predetermined processing on the workpiece; a correction unit on which the operating unit is mounted and which moves on a correction unit movement path arranged parallel to the workpiece transport path on the conveyor by being driven by a first drive source, thereby enabling the operating unit to be positioned at a stop position set on the correction unit movement path; and a second drive source for moving the correction unit on a follow-up unit movement path arranged parallel to the workpiece transport path on the conveyor between a movement start point on the upstream side in the transport direction of the workpiece and a movement end point on the downstream side. The system is characterized by comprising a following unit that can move back and forth by being driven by a drive source, a following processing means that performs a predetermined processing on the workpiece in an operating unit while the following unit follows and synchronizes with the transport of the workpiece on the conveyor , an expansion/contraction detection means that detects the passage of the attachment using a sensor arranged upstream of the starting point of movement on the transport path of the workpiece, and a position correction means that calculates the time interval between the attachments from the detection result of the expansion/contraction detection means, determines the amount of expansion/contraction of the conveyor of the work transport means from the difference in a preset reference time interval, controls the drive of the first drive source , and performs a correction to stop the work unit at a position moved from the stop position by a correction amount corresponding to the amount of expansion/contraction on the correction unit movement path.

According to the workpiece processing device of the invention, in addition to returning the follow-up unit to the start point of movement by the second drive source, the drive of the first drive source is controlled based on the detection result of the fluctuation in the length of the conveyor of the workpiece transport means by the expansion/contraction detection means, and the stop position of the correction unit on the correction unit movement path on the follow-up unit is corrected. As a result, the arrangement position of the working unit mounted on the correction unit relative to the follow-up unit is also corrected, so that even if the length of the conveyor of the workpiece transport means fluctuates, the workpiece transported on the conveyor can be automatically and continuously aligned with the working unit.

Another work processing device of the present invention includes a work transport means for transporting workpieces by arranging attachments at equal intervals on the upper surface of a conveyor on which attachments are arranged at equal intervals in the traveling direction , an operating unit for performing a predetermined processing on the workpieces, and a follow-up unit on which the operating unit is mounted and which is capable of reciprocating by driving a drive source between a movement start point on the upstream side in the workpiece transport direction to a movement end point on the downstream side, the follow-up unit being set on a follow-up unit movement path arranged parallel to the workpiece transport path on the conveyor, and the follow-up unit is caused to follow and synchronize with the transport of the workpieces on the conveyor while the workpieces are transported . The system is characterized by comprising a tracking processing means which performs a predetermined processing on the workpiece by a unit, an expansion/contraction detection means which detects the passage of the attachment using a sensor arranged upstream of the starting point of movement on the transport path of the workpiece , and a position correction means which calculates the time interval between the attachments from the detection result of the expansion/contraction detection means, determines the amount of expansion/contraction of the conveyor of the workpiece transport means from the difference with a preset reference time interval, controls the driving of the drive source, and performs a correction so that the starting point of movement is set to a position moved by a correction amount corresponding to the amount of expansion/contraction on the transport path of the tracking unit.

According to the workpiece processing device of the present invention, when the follow-up unit is returned to the start point of movement, the position of the start point of movement is corrected based on the detection result of the change in the length of the conveyor of the workpiece transport means by the expansion/contraction detection means, so that even if the length of the conveyor of the workpiece transport means changes, the workpiece being transported on the conveyor can be automatically and continuously aligned with the working unit mounted on the follow-up unit.

In this way, with the work processing device of the present invention, if the length of the conveyor of the work transport means changes due to heat or other factors, the position of the working unit can be automatically and continuously corrected to easily align it with the work being transported on the conveyor, preventing damage to the work, ensuring that the specified processing is carried out, and maintaining the operating efficiency of the device itself.

FIG. 1 is a schematic front view showing an embodiment of a work processing device according to the present invention; 1A is a plan view of a main part of an embodiment of the expansion/contraction detecting means of a work processing device according to the present invention; FIG. 1B is a transparent front view of FIG. 1A; and FIG. 1C is a left view of FIG. 1A. FIG. 1A is a plan view of a main part (starting point of movement), and FIG. 1B is a front view of a main part of FIG. 1A, which illustrates a tracking processing means in one embodiment of the work processing device of the present invention. FIG. 1 is a front view of a main part for explaining a follow-up processing means in one embodiment of the work processing device of the present invention (movement end point); FIG. 1 is a front view of a main part for explaining correction of a correction unit in an embodiment of the work processing device of the present invention (starting point of movement);

First Embodiment
As shown in Figure 1, the work processing device of this embodiment is equipped with a work transport means 1 for transporting a container B as a work, and on the work transport path (work transport path) L1, there is provided a filling area in which a filling machine 12 is arranged as an operating unit 11 for filling the container B with a liquid filling material as the contents, and downstream of that, a seaming area is arranged in which a seaming device 60 having a chuck for tightening a cap around the mouth of the container B filled with the contents, and the most upstream part of the work transport path L1 is an entrance section S for the container B, and the most downstream part is a recovery section E for the filled container B.

In detail, the workpiece transport means 1 has a drive chain wheel 7A and a driven chain wheel 7B spaced apart on the downstream and upstream sides in the transport direction of the container B, and are arranged on the frame 2 of the workpiece transport means 1 with their respective rotation axes (centers of rotation) horizontal and parallel. In this embodiment, the drive chain wheel 7A is rotatable by the driving force of the servo motor 3, which serves as a drive source, being transmitted via a transmission system (not shown).

A top chain 5 is hung between the pair of chain wheels 7A, 7B, and serves as an endless conveyor that circulates between a work transport path L1 that is provided above the rotation axis of the chain wheels 7A, 7B, and a return transport path L2 that is provided below the rotation axis and runs in the opposite direction to the work transport path L1. In other words, the section of the travel path of the top chain 5 that can hold and transport a container B on the surface of the top chain 5 is the work transport path L1.

Here, the top chain 5 is made of resin or the like, and has a known configuration in which a single belt member 5A is formed by connecting a plurality of belt members 5A with joint pins (not shown) and formed into an endless shape, the single belt member 5A being integrally formed with a plate-like member formed in a flat shape on which a workpiece can be placed on the upper surface, and a chain portion that meshes with teeth formed on the outer periphery of a pair of chain wheels 7A, 7B, as shown in Figures 2(A) and (B). The belt member 5A of the top chain 5 is equipped with an attachment 8 for holding a container B with its mouth facing upward in the work transport path L1. Note that the attachments 8 do not need to be provided on all belt members 5A, and the intervals between the attachments can be adjusted, for example, by providing an attachment 8 on every fourth belt member 5A.

In the conveying device 1 of this embodiment, the top chain 5 stretched between a pair of chain wheels 7A, 7B runs in a predetermined direction as the driving side chain wheel 7A, to which the driving force of the servo motor 3 is transmitted, rotates, and the driven side chain wheel 7B also rotates in response to the driving force transmitted from the traveling top chain 5.

The filling machine 12, which is equipped with a nozzle 13 that fills the container B transported along the work transport path L1 with a liquid filling material in the filling area, is an operating unit 11 that performs a predetermined process on the container B, and in this embodiment, the nozzle 13 is disposed on the following process means 10 and is capable of following the transport of the container B on the top chain 5.

The tracking processing means 10 is composed of a task unit 11, a correction unit 21 on which the task unit 11 is mounted, and a tracking unit 31 on which the correction unit 21 is mounted.

1 and 3, the follow-up unit 31 is arranged on a wall portion 37 erected from a table 32 of the filling machine 12 provided on one side of the work transport path L1 in the filling area of the work transport means 1, and is composed of an actuator 33 capable of reciprocating a slider stage 33C carrying the correction unit 21 in a horizontal and parallel manner to the work transport path L1. Specifically, the actuator 33 has a ball screw (not shown) arranged in a case 33A, a servo motor (second drive source) 33B that rotates the ball screw, and a slide stage 33C that can slide along a linear guide (not shown) formed in the case 33A by the rotation of the ball screw.

On the movement path (following unit movement path) 35 of the follower unit 31 along which the slide stage 33C can slide, a movement start point on the upstream side and a movement end point on the downstream side are set, which are the working area where the actual filling work is performed, and the slide stage 33C is controlled by the drive control unit 50 to move back and forth between the movement start point and the movement end point by the drive of the servo motor 33B as the second drive source.

The correction unit 21 mounted on the stage of the follow-up unit 31 also comprises an actuator 23 configured in the same manner as the follow-up unit 31, and the slide stage 23 carrying the nozzle 13 of the filling machine 12 as the working unit 11 can be moved back and forth parallel and horizontally to the work transport path L1.

A stop position is set on the movement path (correction unit movement path) 25 along which the slide stage 23 of the case 23A of the correction unit 21 can slide, taking into consideration the current stretched (slackened) state of the top chain 5, and the slide stage 23 carrying the nozzle 13 of the filling machine 12 is moved by the drive of the servo motor 23B as the first drive source, and is controlled by the drive control unit 50 to be positioned at the stop position.

As shown in FIG. 3(B), the slide stage 23 of the correction unit 21 is connected to the support base end 27A of the module base 27, which supports the six nozzles 13 used in the filling process carried out in the filling area, and the main body 27B of the module base 27 extends horizontally above the work transport path L1 and supports the six nozzles 13 by arranging them in the transport direction of the container B according to the set intervals between the containers B being transported.

In the workpiece processing device of this embodiment, as shown in Figures 1 and 5, in order to properly align the container B and the nozzle 13 leading to this filling area, a sensor 42 constituting an expansion/contraction detection means 41 that detects the expansion/contraction of the top chain 5 is disposed upstream of the filling area on the workpiece transport path L1.

In this embodiment, the sensor 42 of the expansion/contraction detection means 41 is a photoelectric sensor consisting of a light-emitting part 42A that emits light and a light-receiving part 42B that receives light. The sensor 42 is arranged on the frame 2 near the driven chain wheel 7B with the light-emitting part 42A and the light-receiving part 42B facing each other across the belt member 5A of the top chain 5, as shown in FIG. 2(C), so that it can detect changes in the amount of light incident on the light-receiving part 42B caused by the passage of attachments 8 arranged at equal intervals on the belt member 5A of the top chain 5 of the work transport means.

The work processing device of this embodiment is set to be able to transmit data to the sensor 42 via the communication means C, and is equipped with a position correction means 51 that processes the detection results of the sensor 42. That is, the position correction means 51 functions as one of the drive control units 50, controls the drive of the servo motor 23A, which is the first drive means, and obtains the distance dimension between adjacent attachments 8, i.e., the distance dimension between the centers of adjacent containers B being transported, from the detection results of the sensor 42, and determines the amount of expansion (dimension) of the top chain 5 by comparing it with the currently set value. In this embodiment, the amount of expansion of the top chain 5 is obtained from the difference between the time interval at which the attachment 8 is detected by the sensor 42 and the reference time interval. Alternatively, the amount of expansion of the top chain may be obtained from the rotation angle of the encoder using the encoder of the servo motor 3 arranged on the drive side chain wheel 7A.

Then, in the position correction means 51, if the detected amount of expansion/contraction is an amount that requires correction, the drive of the servo motor 23A, which is the first driving means, is controlled to move the slide stage 23C carrying the nozzle 13 by the corresponding correction amount on the correction unit movement path 25.

The amount of correction is determined in advance by associating the amount of expansion and contraction that requires correction with the corresponding amount of correction. In the case of this embodiment, the opening diameter of the container B into which the nozzle 13 is loosely inserted and the thickness of the nozzle 13 are also taken into consideration, and the amount of correction is determined according to the amount of expansion and contraction of the top chain 5.

Next, we will explain the operation of the work processing device of this embodiment configured in this way.

In the filling process, the work processing device of this embodiment uses six nozzles 13 to simultaneously fill six corresponding empty containers B with filling liquid. That is, when the slide stage 33C of the follow-up unit 31 is positioned at the movement start point shown in FIG. 3, each nozzle 13 is simultaneously inserted into the openings of these six empty containers B at the timing when the six empty containers B corresponding to each nozzle 13 are aligned. When the slide stage 33C moves from the movement start point to the movement end point on the follow-up unit movement path 35 by driving (forward rotation) the servo motor 33B of the follow-up unit 31 of the follow-up processing means 10, the filling liquid is measured and filled from the liquid supply tank (not shown) through the liquid supply tube (not shown) while following and synchronizing with the transport of the container B. When filling is completed, each nozzle 13 is simultaneously removed from each container B. When the slide stage 33C of the follow-up unit 31 reaches the end point of movement shown in FIG. 4, the servo motor 33B of the follow-up unit 31 is driven (reversely rotated) to return the slide stage 33C to the start point of movement, and the nozzle 13 is ready to fill the next container B.

For example, as shown in Figures 3 and 4, the distance from the start point to the end point is set to the transport distance of four containers B, and while four containers B are being supplied to the work transport path L1, the slide stage 33C of the follow-up unit 31 is moved from the start point to the end point to fill six containers B, and while two containers B are being supplied to the work transport path L1, the slide stage 33C is returned from the end point to the start point. The work processing device is set so that when the slide stage 33C returns to the start point, six empty containers B have been supplied and transported to the corresponding positions of each nozzle 13 at the start point.

At this time, the sensor 42 of the expansion/contraction detection means 41 detects the passage of the attachment 8 passing upstream of the filling area. In this way, by detecting the passage of the attachment 8 near the working unit 11 that adjusts the position with the container B, the alignment with the container B becomes more accurate.

The position correction means 51 obtains the distance between adjacent attachments 8, i.e., the distance between the centers of adjacent containers B to be transported, from the detection results of the sensor 42, and obtains the corresponding correction amount if the amount of expansion or contraction is an amount that requires correction. Then, it controls the drive of the servo motor 23A, which is the first driving means, and moves the slide stage 23C carrying the nozzle 13 to a set position on the correction unit movement path 25 by the corresponding correction amount, as shown in Figure 5. Note that the position of the nozzle 13 before correction is shown by a dashed line in Figure 5. This makes it possible to correct the arrangement position of each nozzle 13 of the working unit with respect to the work transport path L1 when the slide stage 33C of the follower unit returns to the movement start point.

The nozzle 13 shown by the dashed line in Figure 5, which is supported so as to be inserted into the approximate center of the opening of six containers B lined up on the container transport path L1 on the top chain 5 when no stretch has occurred, faces the inside and outside of the opening of six containers B lined up on the container transport path L1 transported by the top chain 5 when stretched, shifting from the approximate center of the opening. Therefore, if the nozzle is misaligned to the extent that it cannot be inserted into the opening, the container B will be soiled and filling will be incomplete.

As described above, when the slide stage 23C of the correction unit 21 is in the reference position, the servo motor 23B of the correction unit 21 is driven to move the slide stage 23C of the correction unit movement path 25, and the position of the mounted nozzle 13 is corrected as shown in FIG. 5. This makes it possible to insert all six nozzles 13 loosely into the opening of the container B without changing the spacing between the six nozzles 13 or the start and end points of the movement of the follow-up unit 31. Therefore, the amount of correction is determined according to the amount of expansion and contraction of the top chain 5, taking into account the distance between adjacent attachments 8, the opening diameter of the container B into which the nozzles 13 are loosely inserted, and the thickness of the nozzles 13.

For example, if it is detected that the distance between adjacent attachments 8 has increased, the servo motor 23B of the correction unit 21 is driven and the slide stage 23C is controlled to move the appropriate distance upstream. This control also moves the position of the module base 27 fixed to the slide stage 23C and the position of the nozzle 13 of the filling machine 12 supported by the module base 27 upstream. If it is detected that the distance between adjacent attachments 8 has decreased, the servo motor 23B of the correction unit 21 is driven and the slide stage 23C is controlled to move downstream. In addition, when the power is turned on again, the slide stage 23C of the correction unit 21 is positioned at the reference position before correction.

In this way, by correcting the position of the nozzle 13 on the correction unit 21, even if the top chain 5 is stretched due to the influence of the heat of the filling liquid being filled into the container B or the weight of the filled container B, it is possible to automatically and continuously correct the position of the nozzle 13 relative to the work transport path of the working unit without changing the control of the reciprocating movement of the slide stage 33B in the follow-up unit 31 from the start point of movement to the end point of movement, and to loosely insert the corresponding nozzle 13 into the opening of each container B.

Second Embodiment
Hereinafter, the work processing apparatus of this embodiment will be described only in terms of the differences from the work processing apparatus of the first embodiment.

The workpiece processing device of this embodiment is configured with different tracking processing devices and correction control means. In detail, the tracking processing device omits the correction unit in the workpiece processing device of the first embodiment, and the support base end of the module base that supports the six nozzles is connected to the slide stage of the tracking unit.

The correction control means corrects the position of the movement start point of the follow-up unit based on the detection result of the expansion/contraction detection means in accordance with the correction control of the first embodiment. In this embodiment, when the follow-up unit is returned to the movement start point, it is returned to the movement start point corrected based on the detection result of the fluctuation in the length of the top chain of the work transport means.

As a result, even in this embodiment, it is possible to automatically and continuously align the containers transported on the top chain with the nozzle of the filling machine mounted on the following unit.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. For example, in this embodiment, a container is assumed as the workpiece, and a filling machine and a seaming device are assumed as processing devices that require positioning with the workpiece provided on the workpiece transport path, but the processing devices are not limited to this. Similarly, in this embodiment, the alignment of the nozzle in the filling machine and the container as the workpiece is described, but it is also possible to correct the alignment of the chuck in the seaming device and the container as the workpiece. Furthermore, although the filling machine has six nozzles and fills at once, the number of nozzles may be one or more. For example, when processing one container (one nozzle or one chuck), the correction amount may be the same as the detected extension dimension of the top chain.

REFERENCE SIGNS LIST 1 Work conveying means 2 Frame 3 Servo motor 5 Top chain 5A Belt member 7A Chain wheel 7B Chain wheel 8 Attachment 10 Follow-up processing means 11 Working unit 12 Filling machine 13 Nozzle 21 Correction unit 23 Actuator 23A Case 23B Servo motor (first driving source)
23C Slide stage 25 Correction unit movement path 27 Module base 27A Support base end 31 Follow-up unit 32 Loading table 33 Actuator 33A Case 33B Servo motor (second driving source)
33C Slide stage 35 Following unit movement path 37 Wall portion 41 Expansion/contraction detection means 42 Sensor 42A Light projecting portion 42B Light receiving portion 50 Drive control portion 51 Position correction means 60 Seaming device L1 Work conveying path L2 Return conveying path B Container S Carrying-in portion E Collection portion C Communication means

Claims (3)

A work processing method in which, in a predetermined processing area provided on a work transport path of a conveyor having attachments disposed at equal intervals, a follower unit carrying an operational unit moves back and forth between a movement start point and a movement end point, so that the operational unit follows and synchronizes with a work transported on the work transport path, and a predetermined processing is performed on the work using the operational unit,
Adjacent attachments arranged at equal intervals on the conveyor are detected by an extension/contraction detection means arranged upstream of the movement start point on the work transport path;
A work processing method characterized by calculating the time interval between the attachments from the detection results of the expansion/contraction detection means, judging the amount of expansion/contraction of the conveyor from the difference with a predetermined standard time interval, and performing control to correct the position of the working unit relative to the work transport path when the following unit returns to the starting point of movement based on a correction amount corresponding to the amount of expansion/contraction. a workpiece transport means for transporting the workpieces by arranging the attachments at equal intervals on an upper surface of a conveyor on which the attachments are arranged at equal intervals in the traveling direction ;
a working unit which performs a predetermined process on the workpiece; a correction unit on which the working unit is mounted and which is driven by a first drive source to move on a correction unit movement path arranged parallel to the workpiece transport path on the conveyor, thereby enabling the working unit to be located at a stop position set on the correction unit movement path; and a follow-up unit on which the correction unit is mounted and which is driven by a second drive source to move back and forth between a movement start point on the upstream side in the workpiece transport direction and a movement end point on the downstream side, which is set on a follow-up unit movement path arranged parallel to the workpiece transport path on the conveyor, and which performs a predetermined process on the workpiece with the working unit while causing the follow-up unit to follow and synchronize with the transport of the workpiece on the conveyor;
an extension/contraction detection means for detecting the passage of the attachment by a sensor disposed upstream of the movement start point on the conveying path of the workpiece ;
a position correction means for calculating a time interval between the attachments from the detection result of the expansion/contraction detection means, judging an amount of expansion/contraction of the conveyor of the work transport means from a difference in a time interval that is a preset reference, controlling the driving of the first drive source , and executing a correction to stop the working unit at a position moved from the stop position by a correction amount corresponding to the amount of expansion/contraction on the correction unit movement path;
A work processing device comprising: a workpiece transport means for transporting the workpieces by arranging the attachments at equal intervals on an upper surface of a conveyor on which the attachments are arranged at equal intervals in the traveling direction ;
a follow-up processing means comprising: an operating unit which performs a predetermined process on the workpiece; and a follow-up unit on which the operating unit is mounted and which is capable of reciprocating movement by a drive source between a start point of movement upstream in the workpiece transport direction to a stop point of movement downstream, the start point of movement being set on a follow-up unit movement path which is arranged parallel to the transport path of the workpiece on the conveyor, the follow-up unit following and synchronizing with the transport of the workpiece on the conveyor while the operating unit performs a predetermined process on the workpiece.
an extension/contraction detection means for detecting the passage of the attachment by a sensor disposed upstream of the movement start point on the conveying path of the workpiece ;
a position correction means for determining a time interval between the attachments from a detection result of the expansion/contraction detection means, determining an amount of expansion/contraction of the conveyor of the work transport means from a difference between the time interval and a preset reference time interval, controlling the driving of the drive source, and correcting the position on the movement path of the follow-up unit by a correction amount corresponding to the amount of expansion/contraction to be the start point of movement;
A work processing device comprising: