JP4913642B2 - Inspection method of printed wiring board - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board inspection system and a printed wiring board inspection method, and more particularly to printing in a roll-to-roll manufacturing process of a double-sided base material in a manufacturing process of a printed wiring board such as a flexible printed circuit board. The present invention relates to a wiring board inspection system and a printed wiring board inspection method.

  In recent years, the production amount of printed wiring boards, for example, FPC (Flexible Printed Circuit) has increased rapidly. Conventionally, as a method for manufacturing a printed wiring board, a circuit is formed on both surfaces of a thin plate-like member made of a sheet-like copper-clad laminate (CCL) having a predetermined width as a material of the printed wiring board. A long sheet-like CCL (a member in which a thin conductive film is formed on both sides of a thin plate-like base member such as polyimide) is cut into a single plate (sheet) of a predetermined length, and this cut Each single plate is overlapped with each other, a through hole is simultaneously formed, through-hole plating is performed on the through-hole, and a circuit is formed by etching or the like on the conductive film on both sides of each single plate subjected to the through-hole plating. The method is known.

  The through-hole plating is performed to electrically connect circuits formed on both surfaces of the printed wiring board.

  Further, in the conventional method, when a circuit is provided for each single plate subjected to the through-hole plating, a circuit is formed for each single plate separated by one.

  However, assuming that the thinning and miniaturization of workpieces will progress in the near future, there is a concern that handling by conventional manual handling becomes difficult, and the roll-to-roll (RR) method is used. Process processing is under consideration. Advantages of this method include ease of handling, ease of labor saving, “reduction of production cost” due to mass production, etc., and “high-value-added products with thin thickness can be produced”.

  In recent years, in the circuit formation process, etc., first, the material supplied in a roll form is first cut into a sheet, and then processed such as drilling and through-hole plating, and the through-hole plating is performed in the middle of the process. Each of the applied sheets is connected (bonded) to each other using a connection tape or the like, and is formed into a long shape and wound into a roll. While each long connected single plate is fed out from the roll and sent in the longitudinal direction, a circuit is formed on both sides of each single plate, wound around another roll, and cut into single sheets in a certain process. Partial roll-to-roll processes have been established. As described above, in the conventional process, in addition to the cutting of the roll-shaped work, the bonding process and the separation process of the single wafer work are indispensable. For such a situation, it has been studied to build a full roll process that can be processed in a roll form from the beginning. As a result, the above-described process of “bonding-separating” can be omitted, so that the efficiency can be improved.

  In light of the background described above, there is an inspection process in the apparatus to be rolled. The circuit formation process is performed after through-hole copper plating, and it is known that the expansion and contraction of the workpiece due to copper plating causes a shift from the circuit. For this reason, the amount of work expansion and contraction is measured after copper plating, and processing such as correcting the circuit forming portion is performed. Against this background, the inspection process has also become roll-to-roll.

  Conventionally, the above inspection process is sufficient for the time being by measuring the center position between through holes. Inspection equipment capable of measuring such workpieces with high accuracy is commercially available, but all of them are for single-wafer workpieces only.

  In addition, most conventional inspection apparatuses are assumed to be in the form of single wafers or single pieces. For example, as shown in FIGS. 5A and 5B, the inspection apparatus 101 includes an apparatus main body 103. A work installation table 105 is provided on the upper part, and a U-shaped arch 107 composed of a vertical arch 107A and a horizontal arch 107B erected on the upper part of the apparatus main body 103 is in the X-axis direction in the front-rear direction [in FIG. The lateral arch 107B that constitutes the U-shaped arch 107 is provided on the lateral arch 107B, for example, a CCD camera 109 as an observation unit in the Y-axis direction in the horizontal direction orthogonal to the X-axis direction [FIG. It is provided so as to be movable in the left-right direction in (A). Alternatively, the U-shaped arch 107 may be fixed to the upper part of the apparatus main body 103, and the workpiece setting table 105 may be movable in the X-axis direction. That is, biaxial measurement of the X axis and the Y axis is possible.

  Further, a work pressing plate 113 for pressing the work 111 placed on the work setting table 105 is provided on the upper part of the apparatus main body 103 so as to be movable up and down.

As shown in FIGS. 6A and 6B, the CCD camera 109 has a hole position of the through hole 115 of the work 111 placed on the work setting table 105, for example, A ₀ , B ₀ or A ₁ , it is to measure the B _1. For example, as shown in FIG. 6A, when the through holes 115 are drilled at positions A ₀ and B ₀ , through holes are plated after the through holes are drilled to form a circuit. Is necessarily expanded and contracted, the hole positions A ₁ and B ₁ of the through hole 115 fluctuate as shown in FIG. Therefore, the expansion / contraction amount can be measured by comparing the hole positions A ₁ and B ₁ with the hole positions A ₀ and B ₀ .

Patent Document 1 discloses a projection exposure apparatus used in the process of manufacturing a printed wiring board, which is different from an inspection apparatus. Since the workpiece expands and contracts so that the position of the hole fluctuates, measures are taken against this expansion / contraction amount (expansion / contraction rate).
JP 2003-270794 A

  By the way, when the roll-shaped workpiece is measured using the conventional inspection apparatus 101 as shown in FIGS. 5A and 5B, there are the following drawbacks.

(1) Even in the plating step, uniform plating is not always performed on the roll-shaped workpiece, and it is conceivable to measure the amount of expansion / contraction with respect to an arbitrary position or total number of the roll-shaped workpiece in the inspection. There was no measurable inspection system.

(2) When an inspection abnormality is found at an arbitrary point on the roll workpiece, there are cases where it is desired to inspect the periphery again. At this time, in the single-wafer workpiece 111, only the workpiece 111 is exchanged, but there is no inspection system that can cope with the roll-shaped workpiece, and thus examination is necessary.

(3) As described above, most of the inspection apparatuses 101 capable of measuring the two axes of the X axis and the Y axis have a structure in which the observation system is operated on one axis and the workpiece, that is, the workpiece setting table 105 is operated on the other axis. There are many current situations. Since a work piece is connected to a roll-like work other than the part to be measured, the work cannot be freely moved. In addition, when operated, there is a problem that accurate measurement cannot be performed because the work position is shifted.

(4) In order to two-dimensionally measure a thin and soft workpiece such as a flexible printed board, it is necessary to press the workpiece against the plane of the workpiece setting table 105. However, in the case of the single-wafer workpiece 111, it can be pressed by the flat workpiece presser plate 113, but in the case of a roll-shaped workpiece, if it is pressed, it will affect other parts of the workpiece, and it will be pulled out by the connected workpiece, so it can be pressed out. Therefore, there was a problem that stable measurement could not be performed.

According to the printed wiring board inspection method of the present invention, a roll-shaped work in the process of manufacturing a printed wiring board is sent from a sending roll disposed on the rear side of the length measuring device, and is passed over the work setting table of the length measuring device. From a roll placed on the front side of the length measuring device, and a part of the roll-shaped workpiece is placed on the workpiece setting table and the amount of expansion and contraction of the roll-shaped workpiece is measured by the length measuring device. In the printed wiring board inspection method to
When transporting the rolled workpiece, the workpiece lifting roll arranged on the front side of the length measuring device is lifting the rolled workpiece away from the workpiece installation table,
When a part of the roll-shaped workpiece is placed on the workpiece setting table, the conveyance of the roll-shaped workpiece is stopped, and then the roll-shaped workpiece is clamped on the rear side of the length measuring device, and the workpiece is moved up and down. While lowering the roll, the roll-like work is pushed down by the work slack-removing roll arranged on the front side of the work raising / lowering roll so as to pull it forward, and the roll-like work is pressed against the work setting table by the work pressing member. Immediately before, the workpiece slack eliminating roll is raised to release the tension of the roll-shaped workpiece, and then the roll-shaped workpiece is pressed by a workpiece pressing member.

  Further, according to the printed wiring board inspection method of the present invention, when the work pressing plate is lowered and the roll-shaped work is pressed against the work setting table, if the roll-shaped work itself is in tension, it does not become flat and accurate. Data will not be obtained. However, when the roll workpiece is lowered, the workpiece slack removing roll is also lowered at the same time to apply the tension to the roll workpiece to remove the slack, but immediately before the roll workpiece is pressed by the workpiece holding plate, By lifting and retracting the slack eliminating roll so as to separate from the roll-shaped workpiece, the roll-shaped workpiece can be pressed onto the workpiece installation table without any problem.

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

  Referring to FIGS. 1A and 1B, the printed wiring board inspection system 1 according to this embodiment measures the position of, for example, a through-hole in the roll-shaped workpiece 3 in the manufacturing process of the printed wiring board. A length measuring device 5, a work feeding device 7 that is arranged on the rear side of the length measuring device 5 and sends the rolled workpiece 3 to the front length measuring device 5, and a front side of the length measuring device 5 And a work take-up device 9 for taking up the roll-shaped work 3.

  The length measuring device 5 is provided with a work setting table 13 for placing a part of the roll-shaped work 3 on the upper part of the apparatus main body 11, and a vertical arch 15 </ b> A and a horizontal arch 15 </ b> B standing on the upper part of the apparatus main body 11. A portal-shaped arch 15 is provided so as to be movable in the front-rear X-axis direction [work transport direction, left-right direction in FIG. On the arch 15B, for example, a CCD camera 17 as an observation unit for observing the roll-shaped workpiece 3 is provided so as to be movable in the Y-axis direction [left-right direction in FIG. 1B] perpendicular to the X-axis direction. Yes. That is, the observation system of the length measuring device 5 measures both the X axis and the Y axis to operate the length.

  The CCD camera 17 is connected to an image processing device and a control device (not shown), and the position of, for example, a through hole of the roll workpiece 3 is calculated from an image captured by the CCD camera 17. The amount of expansion / contraction is calculated.

  Further, even if vibration occurs in the apparatus main body 11 when the portal arch 15 moves in the X-axis direction in order to measure the hole position of the through hole of the roll-shaped workpiece 3 with the CCD camera 17, the apparatus main body 11 Is mounted on the pedestal 19 via, for example, a rubber 21 as a vibration absorbing member, so that the vibration is absorbed by the rubber 21. Thereby, the influence which the said vibration has on the precision at the time of a measurement can be made small.

  Further, for example, a workpiece pressing plate 23 as a workpiece pressing member for pressing the roll-shaped workpiece 3 against the workpiece setting table 13 is provided on the upper portion of the apparatus main body 11 so as to be movable up and down. For example, the work pressing plate 23 is integrally provided on an upper portion of a lifting member 25 that moves up and down on the front side of the length measuring device 5. The elevating member 25 is driven by an elevating drive device (not shown) provided inside the pedestal 19. Further, as shown in FIG. 1B, a window portion 27 through which the roll-shaped workpiece 3 can pass is formed at the upper portion of the elevating member 25.

  The workpiece delivery device 7 includes a delivery-side rotation device 33 including a motor (not shown) for rotating the delivery-side rotation drive shaft 31 that rotates the delivery roll 29 of the roll-shaped workpiece 3, and the rear of the length measuring device 5. And a delivery-side guide roll 35 that guides the roll-shaped workpiece 3 to the height position of the workpiece installation table 13, and a clamp so that the roll-shaped workpiece 3 is sandwiched between the delivery-side guide roll 35. A delivery-side clamp roll 37 that is unclamped is provided.

  The sending-side rotating device 33 is provided with a reverse feed function in addition to the forward feed in the workpiece transfer direction. That is, the motor of the sending side rotation device 33 can rotate forward and backward.

  The workpiece winding device 9 includes a winding side rotation device 43 including a motor (not shown) for rotating the winding side rotation drive shaft 41 that rotates the winding roll 39 of the roll-shaped workpiece 3, and a length measuring device. The roll-shaped workpiece 3 is moved upward so as to be separated from the workpiece setting table 13, or the rolled workpiece 3 is guided to the height position of the workpiece setting table 13. For this purpose, a workpiece raising / lowering roll 45 provided so as to be movable up and down, and a workpiece slack eliminating roll 47 provided so as to be raised and lowered in order to take up the slack of the roll-shaped workpiece 3 generated when the workpiece lifting / lowering roll 45 descends are provided. Yes.

  In addition, it is arranged between a measuring roll 49 for measuring the length of the roll-shaped work 3 conveyed and the work slack eliminating roll 47 behind the measuring roll 49 and the roll-shaped work 3. The first winding side guide roll 51 that guides to press the measuring roll 49 and the second winding that is arranged in front of the measuring roll 49 and guides the rolled work 3 to press the measuring roll 49. A take-side guide roll 53 and a take-up side clamp roll 55 that clamps and unclamps the roll-shaped workpiece 3 so as to sandwich the roll-shaped workpiece 3 are provided.

  In addition, an edge in the width direction of the roll-shaped workpiece 3 is positioned behind the winding-side rotating device 43 so that the edges in the width direction of the roll-shaped workpiece 3 are aligned and wound on the winding roll 39. For example, an edge position controller 59 (EPC) is provided as a winding disturbance prevention device including an edge sensor 57 as an edge detection device to detect.

  The winding side rotation device 43 is provided with a reverse feed function in addition to the forward feed in the workpiece transfer direction. That is, the motor of the winding side rotation device 43 can rotate forward and backward. The meter roll 49 is provided with an encoder (not shown) that measures the rotation of the meter roll 49, for example. Further, the edge position controller 59 (EPC) aligns and winds the edges in the width direction of the rolled workpiece 3 based on the positions of the edges in the width direction of the rolled workpiece 3 detected by the edge sensor 57. And a mechanism for moving and adjusting the winding roll 39 in the width direction.

  In addition, the operation mechanism of each member in the length measuring device 5, the workpiece feeding device 7 and the workpiece winding device 9 is connected to a control device (not shown) and is automatically controlled, and is in the form of a roll. A “conveyance mode” for moving the workpiece 3 to a desired arbitrary position and a “inspection / measurement mode” for performing a length measurement inspection of the rolled workpiece 3 are provided.

  In the above-described embodiment, there is one workpiece lifting roll 45. However, as another embodiment, two workpiece lifting rolls 45 installed in parallel are provided, and the two workpiece lifting rolls 45 are synchronized. The roll-shaped workpiece 3 may be lowered while being leveled.

  Next, the operation of the printed wiring board inspection system 1 having the above configuration will be described.

  In the “conveyance mode”, as shown in FIG. 1A, in the work delivery device 7, the delivery-side clamp roll 37 is separated from the delivery-side guide roll 35 and the roll-shaped workpiece 3 is moved upward. In the length measuring device 5, the work pressing plate 23 is separated upward from the work setting table 13.

  In the work winding device 9, the work lifting roll 45 moves upward, and the roll-shaped work 3 is separated from the work setting table 13. Further, the work slack eliminating roll 47 is also moved upward and away from the roll-shaped work 3. Further, the winding side clamp roll 55 is separated from the measuring roll 49 upward to unclamp the roll-shaped workpiece 3.

  Therefore, the roll-shaped workpiece 3 delivered from the workpiece delivery device 7 passes through the delivery-side guide roll 35 and the window 27 of the elevating member 25 of the workpiece pressing plate 23 as shown in FIG. Since it passes and is sent out over the raised work lifting roll 45, the rolled work 3 is separated from the work setting table 13. That is, in the “conveyance mode”, the roll-shaped work 3 is conveyed so that it does not come into contact with the work setting table 13 and the work pressing plate 23 of the length measuring device 5. This is a configuration in which scratches and the like do not occur.

  Furthermore, the roll-shaped workpiece 3 passes through the first winding-side guide roll 51, the measuring roll 49, and the second winding-side guide roll 53 so that the rolled workpiece 3 is always in contact with the measuring roll 49. Pressed. Thereby, the conveyance length of the roll-shaped workpiece 3 is measured by a measuring device such as an encoder provided on the measuring roller 49.

  Furthermore, after the position of the edge is detected by the edge sensor 57, the roll-shaped workpiece 3 is wound around the winding roll 39 that is driven to rotate in the forward direction by the motor of the winding side rotating device 43. At this time, the winding roll 39 is wound by the edge position controller 59 (EPC) with the edges in the width direction of the roll-shaped workpiece 3 aligned without causing winding unevenness.

  In addition, since the feed roll 29 of the work feed device 7 is rotated in the reverse direction with a force weaker than the forward rotation force of the take-up roll 39, the roll-shaped work 3 is always sent in a tensioned state. Will be. Therefore, by stopping the rotation of the winding roll 39 in the positive direction by the motor of the winding-side rotating device 43 based on the transport length of the rolled workpiece 3 measured by the measuring roll 49, the roll-shaped workpiece 3 is It is possible to stop immediately at an arbitrary position.

  On the other hand, the roll-shaped workpiece 3 is always tensioned by rotating the feeding roll 29 of the workpiece feeding apparatus 7 in the reverse direction and rotating the winding roll 39 in the forward direction with a force weaker than the reverse rotational force of the feeding roll 29. In this state, the sheet is conveyed in the reverse direction. Therefore, the roll-shaped work 3 is reversed by stopping the rotation of the feed roll 29 in the reverse direction by the motor of the feed-side rotating device 33 based on the transport length of the roll-shaped work 3 measured by the measuring roll 49. It is possible to stop immediately at any position.

  As described above, the inspection system 1 according to the present embodiment conveys a workpiece so as not to contact the length measuring device 5 in the “conveyance mode”, and the roll-shaped workpiece 3 is scratched during the workpiece conveyance. It has a function to eliminate possible malfunctions. Further, it has a forward / reverse conveyance function for stopping the roll-shaped workpiece 3 at an arbitrary position, and further has a measuring function for automatically stopping the roll-shaped workpiece 3 so as to prevent winding unevenness in the winding roll 39. It has a turbulence prevention device such as an edge control system (EPC) for pressing.

  Next, the operation in the “inspection / measurement mode” will be described.

  When the “transport mode” is switched to the “inspection / measurement mode”, as shown in FIG. 2A, the roll-shaped workpiece 3 is aligned at a predetermined position in the transport direction by the “transport mode” described above. After the workpiece conveyance is stopped, first, the delivery-side clamp roll 37 of the workpiece delivery device 7 is lowered to clamp the roll-shaped workpiece 3, and the take-up-side clamp roll 55 of the workpiece take-up device 9 is lowered to roll shape. Clamping the workpiece 3 prevents the roll from collapsing due to loosening of the workpiece.

  Next, the work lifting roll 45 is lowered to lower the roll-shaped work 3, thereby lowering the roll-shaped work 3 onto the work setting table 13 of the length measuring device 5. At this time, the work lifting roll 45 is lowered in a state where the work slack eliminating roll 47 is placed on the roll work 3 and a load is applied downward, so that the roll work 3 is forward of the work lifting roll 45. Therefore, the roll is lowered while removing the slack of the roll-shaped work 3 generated when the work lifting roll 45 is lowered.

  Next, the work pressing plate 23 is lowered and the roll-shaped work 3 is pressed by the work setting table 13. At this time, if the roll-shaped workpiece 3 itself has a tension, it does not become a flat surface, and accurate data cannot be obtained particularly by two-dimensional length measurement. Therefore, it has been confirmed that it is effective to give a certain amount of slack before and after the work pressing plate 23 in order to make the roll-shaped work 3 flat. In the case of the example of FIG. 2A, since the work slack eliminating roll 47 is also lowered at the same time when the roll-shaped work 3 is lowered, tension is applied to the roll-shaped work 3. Will occur.

  In order to solve this problem, the work slack eliminating roll 47 is lifted and retracted so as to be separated from the roll-shaped work 3 immediately before the roll-shaped work 3 is pressed by the work pressing plate 23. The installation table 13 can be pressed without any problem. This completes preparation for inspection.

Next, the inspection starts, and in the length measuring device 5, the portal arch 15 moves in the X-axis direction and, for example, the CCD camera 17 as the observation unit moves in the Y-axis direction, for example, as shown in FIG. As shown, hole positions A ₁ and B ₁ of the through hole 61 after through hole plating and circuit formation are automatically measured. Therefore, for example, as shown in FIG. 4A, when the hole positions when the through holes 61 are drilled in the printed wiring board manufacturing process are A ₀ and B ₀ , the control device performs the above measurement. By comparing the hole positions A ₁ , B ₁ with the hole positions A ₀ , B ₀ , the amount of expansion / contraction at a predetermined position of the roll workpiece 3 can be calculated. This completes the inspection.

  By switching to the “transport mode” again, preparations for inspecting another arbitrary position of the rolled workpiece 3 are started. After the preparation is completed, the inspection is completed when the inspection starts and ends. Therefore, the loop process of “conveyance → mode switching → inspection → mode switching → conveyance” is repeated.

  It should be noted that the above-described loop process is performed by either a fully automatic method or a manual operation method, and either of the device configurations can be selected.

  In the case shown in FIG. 1 and FIG. 2 described above, since the distance between the work holding plate 23 and the sending side clamp roll 37 of the work sending device 7 is small on the work sending side, There is no 3 slack margin. In such a case, as shown in FIG. 3, the roll-shaped workpiece 3 is provided with a slack margin by providing a space 63 with the work feeding device 7 and the length measuring device 5 slightly separated from each other. Can do.

  At this time, since the front surface of the length measuring device 5 is directed toward the workpiece feeding device 7, a space 63 that can be used by the length measuring device 5 alone is created when inspecting a single-wafer workpiece. There is.

  From the above, by providing the workpiece conveying device including the workpiece feeding device 7 and the workpiece winding device 9 before and after the length measuring device 5, the roll-shaped workpiece 3 can be conveyed and any position or the total number can be obtained. The inspection of the workpiece is now possible. As an example, as an intermittent inspection corresponding to a random sampling inspection, for example, a length measurement inspection is performed by transporting 10 m (meters) at a time.

  Therefore, it was possible to roll-to-roll the inspection process that could only handle single-plate (sheet-fed) workpieces in the past, so it was possible to eliminate the extra process and build a stable process. did it.

  Further, since the workpiece feeding device 7 and the workpiece winding device 9 can be rotated forward / reversely, when the inspection abnormality occurs, the roll-shaped workpiece 3 can be transported to an arbitrary position and the surrounding portion can be re-inspected. .

  In addition, since there is a function for giving looseness to the roll-shaped workpiece 3 before and after the length measuring device 5, for example, a workpiece slack removing roll 47, when a workpiece presser plate 23 for pressing the length measuring device 5 with a flat surface is installed. In addition, the effect is large, and an accurate inspection becomes possible.

  Further, since there are the delivery side clamp roll 37 and the take-up side clamp roll 55, it becomes possible to inspect the roll-like work 3 in the work delivery device 7 and the work take-up device 9 without causing turbulence. . As a result, it has become possible to wind up after the length measurement inspection without being disturbed.

  Further, since the work winding device 9 has a measuring function such as a measuring roll 49 and an encoder for detecting the number of rotations of the measuring roll 49, a sampling inspection at an arbitrary position on the roll-shaped work 3 can be automatically performed.

  In addition, by providing a space 63 between the workpiece feeding device 7 and the front surface of the length measuring device 5, it is possible to inspect a single wafer workpiece.

1 shows a printed wiring board inspection system according to an embodiment of the present invention, in which (A) is a front view in the “transport mode”, and (B) is an arrow view IB-IB of the length measuring device in (A). It is a side view of a line. 1 shows a printed wiring board inspection system according to an embodiment of the present invention, in which (A) is a front view in the “inspection / measurement mode”, and (B) is an arrow view IIB of the length measuring device in (A). It is a side view of a -IIB line. FIG. 10 shows a printed wiring board inspection system according to another embodiment of the present invention, and is a front view in an “inspection / measurement mode”. (A) is a top view which shows the hole position when the through-hole of a roll-shaped workpiece | work is pierced in the manufacturing process of a printed wiring board, (B) is a top view which shows the hole position after through-hole plating and circuit formation. . 1 shows a conventional printed wiring board inspection apparatus, in which (A) is a front view and (B) is a side view. (A) is a top view which shows the hole position when the through-hole of a single workpiece | work is pierced in the manufacturing process of a printed wiring board, (B) is a top view which shows the hole position after through-hole plating and circuit formation. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inspection system of printed wiring board 3 Rolled workpiece 5 Measuring device 7 Work feeding device 9 Work winding device 11 Main body 13 Work installation table 15 U-shaped arch 17 CCD camera (observation part)
19 Base 21 Rubber (vibration absorbing member)
23 Work holding plate (Work holding member)
25 Lifting member 29 Sending roll 33 Sending side rotating device 35 Sending side guide roll 37 Sending side clamp roll 39 Winding roll 43 Winding side rotating device 45 Work lifting roll 47 Work slack removing roll 49 Measuring roll 55 Winding side clamp roll 57 Edge sensor (edge detection device)
59 Edge Position Controller (EPC)
61 through hole 63 space

Claims (1)

A roll-shaped workpiece in the process of manufacturing a printed wiring board is fed from a feeding roll arranged on the rear side of the length measuring device, and is passed on the workpiece setting table of the length measuring device and then arranged on the front side of the length measuring device. In the method for inspecting a printed wiring board, a part of the roll-shaped work is placed on the work installation table and the amount of expansion / contraction of the roll-shaped work is measured by the length measuring device, while being wound on a winding roll.
When transporting the rolled workpiece, the workpiece lifting roll arranged on the front side of the length measuring device is lifting the rolled workpiece away from the workpiece installation table,
When a part of the roll-shaped workpiece is placed on the workpiece setting table, the conveyance of the roll-shaped workpiece is stopped, and then the roll-shaped workpiece is clamped on the rear side of the length measuring device, and the workpiece is moved up and down. While lowering the roll, the roll-like work is pushed down by the work slack-removing roll arranged on the front side of the work raising / lowering roll so as to pull it forward, and the roll-like work is pressed against the work setting table by the work pressing member. A method for inspecting a printed wiring board, wherein the work loosening roll is raised immediately before releasing the tension of the roll-shaped work, and then the roll-shaped work is pressed by a work pressing member.

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