JP2825316B2 - Detection mark marking device for printed circuit boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for imprinting a detection mark for quality judgment on a printed circuit board.

(Prior art)

On a printed circuit board, a conductor circuit (pattern) is formed on the surface or inside. However, this conductor circuit may be defective due to disconnection, short circuit, etc. in the manufacturing process.

Therefore, such a failed printed board is detected in the checker section. Then, a detection mark is attached to the rejected printed circuit board at the stamped portion to distinguish the rejected printed circuit board from the acceptable printed circuit board. In addition, the detection mark is attached to the passing printed circuit board contrary to the above.
It is provided to distinguish it from other printed circuit boards, such as according to the type of pattern on the printed circuit board regardless of rejection.

Conventionally, various methods have been proposed and implemented as the method of providing the detection mark.

First, the method shown in FIGS. 8 to 11 is a push-back method. This method uses a punching machine 9 comprising an air cylinder 91 having a punching head 92, a punching table 93, and a push rod 94. When the detection mark is to be provided, the printed circuit board 8 for providing the detection mark is placed on the punching table 93. At this time, the printed circuit board 8
Position the detection mark application position (see FIG. 11) on the mark hole 931 of the punching table 93. This printed circuit board 8
Pass / fail has not yet been determined. Therefore, all the printed circuit boards 8 are thus provided with the detection mark.

Then, as shown in FIGS. 8 and 9, the air cylinder
By operating 91, the punching head 92 provided at the lower end thereof is pressed against the printed circuit board 8 to punch out the detection mark imparting portion.
As a result, the punched mark pieces 83 fall into the mark holes 931. Further, a hole 81 is formed in the printed circuit board 8.

Next, as shown in FIG. 10, the push rod 94 provided below the mark hole 931 is raised, and the mark piece 83 is
The printed circuit board 8 is returned into the hole 81. That is, the mark piece 83 is pushed back to the original position again (push back). This state is shown in FIG. 10 and FIG. Eleventh
Reference numeral 801 in the figure denotes a conductor circuit.

Then, the quality of all the printed boards in which the mark pieces 83 are embedded is determined, and the mark pieces 83 are pushed out for the printed boards determined to be defective. From this, it can be determined that the defective product has the hole 81 and the acceptable product has no hole with the mark piece 83 being buried. The above-mentioned mark piece 83 is a hole 81
It is embedded inside and does not come off easily.

Next, the methods shown in FIGS. 12 to 14 are all based on the ink method of applying ink, and a detection mark is attached to a printed circuit board determined to be defective, for example. That is, in the method shown in FIG. 12, the ink 951 is sprayed from the spray 95 on the surface of the printed circuit board 8 to make the detection mark 84.

In the method shown in FIG. 13, the stamp 962 is imprinted on the printed circuit board 8 and the detection mark 85 is provided. The stamp 962 has an ink reservoir 96 above, between which a number of capillaries 961 for ink supply are filled.

Further, the method shown in FIG. 14 uses a screen printing machine 97 having a screen 971 on the lower surface, and the ink 97 for the mark is used.
4 is applied onto the printed circuit board 8 by a squeegee 972. The screen 971 is provided with a detection mark attaching hole 973.
And ink is applied onto the printed circuit board 8 from this portion.

[Problem to be solved]

However, in the former push-back method, punching of a detection mark and push-back operation are required. Further, depending on the material of the printed circuit board, a punching defect may occur, or a mark piece may fall off during conveyance due to incomplete pushback.

On the other hand, in the case of the latter ink system, ink management and adjustment are complicated, such as a case where a non-defective printed circuit board becomes dirty due to ink scattering or an ink supply is insufficient. In addition, the drying of the applied ink is slow and adheres to other parts.
After the detection mark is applied, the printed circuit boards cannot be overlapped, which hinders the management of the printed circuit boards. In addition, the ink of the detection mark may disappear in a process of cleaning the printed circuit board or the like, and the durability of the detection mark is poor.

In view of the conventional problems, the present invention provides a detection mark stamping device for a printed circuit board, which is effective in providing detection marks, does not require ink management and adjustment, and has excellent durability of detection marks. It is something to offer.

[Solutions to solve the problem]

The present invention relates to a detection mark marking device having a checker unit for detecting a state of a printed circuit board and a marking unit for marking a detection mark on a printed circuit board sent from the checker unit, wherein the marking unit is configured. The marking device includes a stamping machine having a stamping head and a heater, a thermal transfer film supplied between the stamping head and a printed board, a film feeder supplying the thermal transfer film, and a thermal transfer film after stamping. Film take-up machine. The stamping machine is connected to a parallel chuck that opens and closes in the opposite direction, and the film winder is
The one-way clutch and the rack and pinion mechanism are connected to the parallel chuck. When the parallel chuck is opened, the one-way clutch rotates the film winder in the winding direction, and when the parallel chuck is closed. The stamping machine stamps the detection mark, and the one-way clutch does not reversely rotate the film winder.

Most remarkable in the present invention is that a marking device is provided adjacent to the checker portion, and the marking device has a thermal transfer film, a stamping machine, a film feeder, and a film winder. Further, the stamping machine is connected to a parallel chuck as a driving source thereof, and the film winding machine is connected to the parallel chuck via a one-way clutch and a rack and pinion mechanism so as to be interlocked therewith.

The thermal transfer film refers to a thermal transfer material capable of transferring a paint provided on the thermal transfer film to a printed board by heating. Examples of such a thermal transfer material include vapor-deposited foil and pigment foil.

Among these, it is particularly preferable to use a material composed of a polypropylene film and a pigment foil such as titanium dioxide as the thermal transfer film. In particular, it can reliably provide a detection mark on a resin-based printed circuit board such as a glass / epoxy resin board, and has strong durability against cleaning chemicals and the like.

Further, it is preferable to use a long heat transfer film, which is generally called a heat transfer ribbon.

The stamping head has a desired detection mark shape such as a circle, a triangle, a character, and a special sign on a contact surface with the thermal transfer film. The printing head is heated to a temperature required for the thermal transfer film (for example, 100 to 130 ° C.).

The printing head is made of metal or heat-resistant rubber such as silicon rubber, fluorine rubber, and Hypalon. When the marking head is made of heat-resistant rubber, the printed board is not damaged, and even if the printed board has irregularities, the pressing force is evenly applied, the detection mark can be easily attached, and stable marking can be performed. Among them, silicone rubber and fluorine rubber are particularly preferable because they have excellent heat resistance and good releasability from the thermal transfer film after stamping. On the other hand, a metal printing head has good thermal conductivity and is hard, so that the transfer speed is high.

In the present invention, the parallel chuck means a pair of claws for opening and closing in a direction opposite to each other, and is known per se. Mechanisms for opening and closing the claws include a cam mechanism and a gear mechanism.

The one-way clutch is formed by combining two one-way clutches that rotate only in opposite directions.

The checker is a device for inspecting a printed circuit board. The inspection includes, for example, a defective portion such as a short circuit or disconnection of a conductor circuit. These inspections are performed by measuring the resistance between conductor circuits. In addition, for a printed circuit board which is detected as a defective product in the checker section and has a detection mark, for example, the detection mark is stamped in the marking device. However, it is often physically difficult to arrange the checker unit and the marking device in the same place.

Therefore, the printed circuit board that has been verified as a defective product by the checker section is stamped when it is sent to the position of the marking device. That is, since the printed circuit boards are generally formed as individual printed circuit boards (individual substrates) in a long film (strip), the printed circuit board films are sequentially sent from the checker section to the marking device. Therefore, when a check is made by the checker unit as a defective product, for example, when the third printed circuit board (that is, the defective product) reaches the position of the marking device, the printed circuit board is stamped.

Such cooperation between the tucker section and the marking device is based on the premise that the moving distance of the printed circuit board film in one inspection is measured in advance, and the moving length of the printed circuit board film from the time when it is verified as defective is measured. It can be detected and stamped.

In addition, when the printed circuit board is inserted into the checker section, the board input section is a device that positions the printed circuit board and then sends the printed circuit board to the checker section.

In the present invention, the detection mark is, as described above, an identification mark used for detecting whether the printed circuit board is good or defective, or for selecting the type of conductor circuit, and the like. In some cases, it may be referred to as

(Operation)

In the marking device of the present invention, first, a printed board is placed in the board loading section, and preparations for inspection in the checker section are made. Next, the printed circuit board is supplied (supplied) to the checker section. Then, the checker section inspects the quality of the printed circuit board and the like. Thereafter, the printed circuit board is sent to the marking device, and the check mark is imprinted, for example, on the printed circuit board that has been inspected as defective by the checker unit.

In this marking, a thermal transfer film is placed on the surface of a printed circuit board on which a detection mark is to be provided, and the heated printing head is pressed onto the thermal transfer film for about 1 to 15 seconds. As a result, the paint of the thermal transfer film is transferred to the printed circuit board, and a detection mark is provided. Then, the printing head is separated from the surface of the thermal transfer film. The transferred detection mark is rapidly cooled and firmly adheres to the printed circuit board.

The thermal transfer film is fed forward by the film feeder for each stamp, and a new surface is supplied to the position of the stamp head.

In the present invention, the detection mark can be provided only by pressing the thermal transfer film supplied from the film supply machine onto the printed circuit board by the marking head. , No adjustment is required.

Further, since the detection mark transferred by heat is immediately solidified and adhered by cooling, there is no scattering or adhesion to other parts as in the conventional ink system. Therefore, the printed circuit boards provided with the detection marks can be stored and transported immediately superimposed.

Also, unlike the conventional push-back method, the mark pieces do not fall off, and no mark failure occurs.

Further, in the present invention, since the board input section, the checker section, and the mark device are sequentially arranged adjacent to each other, it is possible to efficiently perform the inspection of the printed board and the stamping of the detection mark based on the inspection result.

The detection mark stamped by the device of the present invention is automatically detected by a mark detector or the like in a later process,
The apparatus can be fully automated. In addition, because a mark that can be easily checked without overlooking is obtained even by visual inspection,
It is possible to prevent defects from being mixed into non-defective products.

Further, in the present invention, the driving of the stamping machine and the film winding machine is performed by the same parallel chuck.

That is, the opening and closing of the parallel chuck causes the printing machine to move in the facing direction. In this case, when the parallel chuck is closed, the stamping machine performs the stamping.

When the parallel chuck is opened, the stamping machine finishes the stamping and returns to the original position, and at the same time, the one-way clutch rotates the film winder in the winding direction.

On the other hand, when the parallel chuck is closed again, as described above, the marking machine stamps the detection mark on the printed circuit board, and at the same time, the one-way clutch prevents the film winding machine from rotating backward.

(Effect)

Therefore, according to the present invention, there is provided a detection mark marking device for a printed circuit board, which is effective in providing a detection mark, does not require complicated management and adjustment of ink, and has excellent durability of the detection mark. be able to. Furthermore, it is possible to provide a detection mark stamping device for a printed circuit board in which the driving source of the stamping machine and the film winding machine are the same and the wound thermal transfer film is not loosened.

〔Example〕

An apparatus for marking a detection mark on a printed circuit board according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 7, the detection mark marking device of the present embodiment includes a substrate loading section A, a checker section B, a marking section C, and a discharge section D.

The board loading section A is a conventional apparatus (not shown) for positioning the printed board 8 when the printed board 8 is supplied to the checker 71 of the checker section B.

The checker section B is an inspection machine that inspects the conductor circuit of the printed circuit board 8 for shots and disconnections. The inspection is performed by measuring the resistance of the conductor circuit as in the conventional case.

The stamping section C is a section for stamping a detection mark on a defective printed circuit board. As shown in FIGS. 1 and 2, the marking device 3 constituting the marking section C includes a marking machine 1 having a marking head 15 and a heater 13;
A thermal transfer ribbon 20 as a thermal transfer film supplied between the substrate 15 and the printed board 8, a film feeder 2 for supplying the thermal transfer ribbon 20, and a film winding machine 4 for winding the thermal transfer ribbon 20 after stamping. Become. The stamping machine 1 is connected to a claw 50 of a parallel chuck 5 which opens and closes in the opposite direction (FIGS. 4 to 6).

The film winder 4 is a one-way clutch.
It is connected to the parallel chuck 5 through a rack and pinion mechanism 62. When the parallel chuck 5 is opened, the film winder 4 is rotated in the winding direction by the one-way clutch 62. When the parallel chuck 5 is closed, the marking machine 1 stamps the detection mark and the one-way clutch.
By 62, the film winder 4 is configured not to reversely rotate.

The discharge section D is a section for sending out the printed circuit board 8 sent from the seal section C to the outside, and is a roller conveyor 72.
Is formed.

The marking device 3 has a pair of upper and lower stamping machines 1 as shown in FIG. As shown in FIG. 3, the printing machine 1 includes a pair of printing machine main bodies 11 and a support portion 12 for elastically supporting the printing machine main body 11.

The main body 11 of the printing machine is a printing head protruding in the opposite direction.
15 and a heater 13 for heating the printing head 15. As shown in the figure, U-shaped brackets 111 are fixed to both right and left sides of the stamping machine main body 11, and adjust bolts 112 are screwed to the brackets 111. On the other hand, a pair of upper and lower brackets 121 through which the adjustment bolt 112 is inserted are projected from the support portion 12.

Then, a coil spring 122 is interposed between the bracket 121 on the upper side of the support portion 12 and the bracket 111 of the printer body 11. The coil spring 122 urges the printer body 11 toward the printed circuit board 8 with a constant pressure. In addition, the head of the adjustment bolt 112 abuts on the bracket 121 of the support section 12 to regulate the movement of the printing machine main body 11 due to the bias of the coil spring 122.

The support section 12 is fixed to the arm 123 as shown in FIG. The arm 123 is fixed to the claw 50 of the parallel chuck 5 that opens and closes in the opposite direction. The parallel chuck is a known one, and has a pair of claws 50 opened and closed in the facing direction by a cam mechanism. The cam mechanism is driven by an actuator such as an air cylinder.

The film feeder 2 has a pair of upper and lower supply pulleys 21 and 22, as shown in FIGS. The supply pulleys 21 and 22 are pivotally attached to the main body frame 30 by the drive shaft 200. A coil spring 23 is wound around the drive shaft 200 as shown in FIG. The supply pulleys 21 and 22 rotate while applying a constant tension by the coil spring 23.

The film winder 4 has a pair of upper and lower winding pulleys 41 and 42 as shown in FIGS. The winding pulleys 41 and 42 are connected to the parallel chuck 5 via a one-way clutch 62 and a rack and pinion mechanism 61.

When the parallel chuck 5 is opened, the take-up pulleys 41 and 42 rotate in the take-up direction by the one-way clutch 62,
When the parallel chuck is closed, the one-way clutch 62
Thus, the take-up pulleys 41 and 42 are configured not to reversely rotate. The one-way clutch 62 is formed by a first one-way clutch 621 and a second one-way clutch 622 that rotate only in opposite directions. The rack and pinion mechanism 61 is formed by a rack 611 and a pinion 621.

That is, as shown in FIG. 4, the drive shaft 400 of the take-up pulleys 41 and 42 is supported by a boss 43 fixed to the main body frame 30 at an intermediate portion thereof. A one-way clutch 621 that rotates the drive shaft 400 only in the winding direction of the winding pulleys 41 and 42 is interposed between the boss 43 and the drive shaft 400.

A pinion 612 is provided at an end of the drive shaft 400. The drive shaft is located between the pinion 612 and the drive shaft 400.
A second one-way clutch 622 for rotating 400 only in the direction opposite to the winding direction of the winding pulleys 41 and 42 is provided. A rack 611 is engaged with the pinion 612. The rack 611 is
It is fixed to the claws 50 of the parallel chuck 5 via the rack receiver 610.

The thermal transfer ribbon 20 as the thermal transfer film is a second transfer ribbon.
As shown in the figure, one is the feed pulley of the film feeder 2.
The other is wound on winding pulleys 41, 42 of the film winder 4, while the other is supported by guide rollers 29, 49.

The printed circuit board 8 is formed by printing a large number on a long film-shaped board film 80.

In FIG. 2, 39 is a board guide, and 18 is a stamping machine 1.
Mark frames 161 and 162 are provided on the upper and lower surfaces of the board guide 39 so as to correspond to the stamping heads 15, 161, 162 are a pair of upper and lower entrance guides for introducing the printed board 8 into the mark frame 18, and 171 and 172 are 1 shows a pair of upper and lower exit guides for sending out from a hopper.

The detection mark marking device for a printed circuit board according to the present embodiment is configured as described above, and exhibits the following operation and effect.

First, the operation and effect of the stamping machine 1, the film feeder 2 and the film winder 4 will be described with respect to the operation of the upper marking device.

That is, in stamping, first, the thermal transfer ribbon 20 is positioned above the printed wiring board 8 in a state of being slightly stretched. On the other hand, in the stamping machine 1, the heater 13 is set to about 110 ° C.
And the printing head 15 is kept at about 100 ° C.

Thereafter, as will be described later, the parallel chuck 5 is operated to lower the heater 13 and the printing head 15, and the printing head 1 is moved downward.
5 is pressed onto the printed circuit board 8 via the thermal transfer ribbon 20. This pressing was performed for about 8 seconds. After that, the marking head 15
Is raised, and the printing head 15 is separated from the thermal transfer ribbon 20.

As a result, the paint was thermally transferred from the thermal transfer ribbon 20 onto the printed circuit board 8, and the detection marks were solidified and adhered.
After the transfer, the thermal transfer ribbon 20 is wound up by one detection mark by the winding roller 41, and a new thermal transfer ribbon portion is positioned below the printing head 15. Hereinafter, thermal transfer is performed in the same manner.

The above-described stamping, supply and winding of the thermal transfer ribbon and the like are the same for the stamping machine 1 and the thermal transfer ribbon 20 at the lower side.

Next, the operation of the parallel chuck 5, the one-way clutch 62, and the like for operating the printing machine 1 and the film winder 4 will be described.

That is, in performing the marking by the marking device 3, the upper and lower claws 50 are closed by operating the parallel chuck 5 in FIG. 1 and FIG. As a result, the pair of upper and lower stamping machines 1 move in a direction approaching each other, and as described above,
The upper and lower marking heads 15 mark the detection mark. In this case, as shown in FIG. 3, the support portion 12 of the marking machine 1 is moved in the marking direction by the parallel chuck 5, and the marking machine body 11 is also moved in the marking direction along with the support portion 12. Then, the printing head 15 of the printing machine main body 11 presses the printed board 8 via the thermal transfer ribbon 20. At this time, the coil spring 122 contracts, and the printing head 1
5 is pressed with an appropriate load.

After stamping, the parallel chuck 5 is operated again to open the claws 50. As a result, the upper and lower stamping machines 1 move in directions away from each other.

As described above, when the claws 50 of the parallel chuck 5 are opened,
As shown in FIGS. 1 and 4, the rack 611 moves in the direction away from the stamping machine 1 via the rack receiver 610. The rack 611 rotates the pinion 612 in the winding direction of the winding pulleys 41 and 42 so as to mesh with the pinion 612.

At this time, the second one-way clutch 622 incorporated in the pinion 612 is in a state in which the drive shaft 400 and the pinion 612 are fixed. On the other hand, the first one-way clutch 612 on the boss 43 side cuts the edge between the drive shaft 400 and the boss 43, and the drive shaft 400 is in a rotatable state. Therefore, the rotation of the pinion 612 is controlled by the second one-way clutch 622.
To the drive shaft 400 to rotate the winding pulleys 41 and 42 in the winding direction.

On the other hand, when the claws 50 of the parallel chuck 5 are closed, the rack 611 moves in the direction of approaching along with the stamping machine 1 as shown in FIG. The rack 611 is provided with a pinion 612.
Is rotated in the direction opposite to the winding direction of the winding pulleys 41 and 42.
At this time, the second one-way clutch 622 on the pinion 612 side
Cuts the edge between the drive shaft 400 and the pinion 612. On the other hand, the first one-way clutch 621 on the boss 43 side is
00 and the boss 43 are fixed. for that reason,
The winding pulleys 41 and 42 do not rotate in reverse.

Therefore, slack of the thermal transfer ribbon 20 can be prevented.

Further, the marking device 3 is moved along the substrate guide 39 in order to perform the above-described sealing at a desired position on the printed circuit board 8.

In addition, the printed circuit board 8 that has been verified as defective by the inspection machine 71
Is stamped when it has moved several positions from the current position and reached the position of the marking head 15 of the marking device 3 (see FIG. 7). This movement amount is detected by a movement amount sensor (not shown), and a signal thereof is sent to the mark device 3. Thereby, the detection mark is imprinted on the defective printed circuit board 8.

As described above, according to this example, the heated printing head 15
Thus, the detection mark can be stamped only by pressing the thermal transfer ribbon 20 onto the printed circuit board 8. Further, since the transfer paint is fixed on the thermal transfer ribbon and is always in a solidified state, there is no fear of scattering and supply failure as in the conventional ink system.

Further, after the seal is applied, the paint is immediately solidified and adhered to the printed circuit board, so that there is no other adhesion. Therefore,
Immediately after stamping, the printed circuit boards can be overlaid. Further, the imprinted detection mark has excellent durability against solvents and chemicals.

Also, in this example, the board input section, the checker section,
Since the marking device and the discharge unit are arranged continuously, it is possible to efficiently seal the detection mark according to the inspection result.

Further, the stamping machine 1 and the film winder 4 are linked by a parallel chuck 5 as the same drive source, and the film winder 4 is configured so as not to rotate in the reverse direction by the one-way clutch 62. Therefore, by a detection mark stamping device having a simple structure, the stamping operation and the supply and winding of the thermal transfer ribbon can be automatically performed without causing the thermal transfer ribbon to be loosened.

[Brief description of the drawings]

1 to 7 show a detection mark marking device for a printed circuit board according to an embodiment, FIG. 1 is a schematic explanatory view of a marking portion, FIG. 2 is a perspective view thereof, FIG. FIG. 4 is a plan sectional view, FIG. 5 is a side sectional view thereof, FIG. 6 is a rear view thereof, FIG.
8 to 14 show a conventional detection mark providing method. FIGS. 8 to 11 are process explanatory diagrams of a push-back method.
Fig. 14 shows the ink system, Fig. 12 shows the spray system,
FIG. 13 is an explanatory diagram showing a stamp system, and FIG. 14 is an explanatory diagram showing a screen system. 1 ... printing machine, 13 ... heater, 15 ... printing head, 2 ... film feeder, 20 ... thermal transfer ribbon, 21,22 ... supply pulley, 3 ... mark device, 4 ... film winding , 41, 42 ... take-up pulley, 5 ... parallel chuck, 50 ... nail, 61 ... rack and pinion mechanism, 611 ... rack, 612 ... pinion, 62 ... one-way clutch, 621 ... 1 one-way clutch, 622… 2nd one-way clutch, 8… printed circuit board,

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B41F 17/14 B41F 17/36 B41F 16/00 H05K 3/00

Claims (1)

(57) [Claims] 1. A detection mark marking device having a checker unit for detecting a state of a printed circuit board and a marking unit for marking a detection mark on a printed circuit board sent from the checker unit. The marking device comprises a printing machine having a printing head and a heater, a thermal transfer film supplied between the printing head and the printed board, a film supply device for supplying the thermal transfer film, and a thermal transfer film after printing. The stamping machine is connected to a parallel chuck that opens and closes in the opposite direction, and the film winder is connected to the parallel chuck via a one-way clutch and a rack and pinion mechanism. When the parallel chuck is opened, the film winder moves in the winding direction by the one-way clutch. Rolling, and also when the parallel chuck is closed, the printed circuit board, characterized in that where the structure by the one-way clutch film winder does not reverse rotate with stamping machine for stamping the detection mark detection mark marking device.