JPH073311B2 - Circuit board dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit board drying apparatus that performs necessary drying when forming a wiring pattern, a resistance film, an insulating protective film, or the like on a circuit board. .

In this specification, the term “circuit board” means a board such as a semiconductor integrated circuit device, a hybrid integrated circuit device, or a printed wiring board. The target of drying is a conductive film, a resistor film, an insulating film, or the like.

[Prior Art] FIGS. 3A and 3B are explanatory views of a circuit board drying apparatus in a conventional example. In FIG. 3, a drying oven 33 is placed on a frame 32. And inside the drying oven 33,
The belt conveyor 34 is driven from the left side to the right side, for example, as shown in FIG. The circuit board 35 to be dried is inserted from the left side of the drying furnace 33, and enters the drying furnace 33 on the belt conveyor 34 at an appropriate speed according to the type of coating film applied to the circuit board 35. After that, the circuit board with the coating film dried
35 is taken out from the right side of the drying oven 33.

The drying device 31 shown in FIG. 3 (a) is of a type in which the circuit boards 35 are serially passed through one another in a high temperature atmosphere to dry.
The drying device 31 'shown in FIG.
Are also dried in parallel at once.

[Problems to be Solved by the Invention]

There is a conductive film to be a wiring pattern, a resistive film to be a resistor, an insulating protective film, or the like to be applied to the circuit board, and printing processes of different materials cannot be performed at the same time. For example, a wiring pattern is printed with a conductive film and then dried, and then a step of printing a resistive paint to form a resistor is performed. If the resistance value does not reach the desired resistance value only by changing the application area of the resistance paint when there is a difference, the resistance material is changed and printing is performed in several times.

The printing process is always followed by a drying process, and the time required for the drying process is very long compared to the time for printing.

Therefore, when printing the circuit boards 35 in series one by one, if the drying oven 33 is also in series as shown in FIG. Is convenient. However, since the time required for the printing process for printing the circuit board 35 is short, but the drying time is long, a large number of drying devices 31 must be provided.

Further, a drying device 31 'for drying a plurality of circuit boards 35 in parallel.
Is shown in FIG.

Even if the drying oven 33 is expanded in the width direction like the drying device 31 ′, in order to timely match the printing process and the drying process,
It is necessary to widen the width of the drying device. In particular, when printing those having different resistance values, printing and drying must be repeated, which increases the floor area of the drying device. Further, if the drying ovens 33 are arranged in parallel, the device for supplying or housing the circuit board 35 becomes complicated.

Further, it is possible to raise the temperature of the atmosphere of the drying oven 33 to increase the drying speed to reduce the area of the drying oven 33, but there is a limit depending on the material printed on the circuit board 35.

In order to solve the above problems, according to the present invention, circuit boards are supplied and housed in series, and a vertical drying oven is used. An object is to provide a drying device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the circuit board drying apparatus of the present invention includes a pair of rising endless belts arranged so that the circuit board supporting portions supporting both ends of the circuit board continuously face each other, and the rising endless belt. A pair of descending endless belts, which are arranged so as to continuously oppose the circuit board supporting portions which are oppositely rotated coaxially with the belt and support both ends of the circuit board, face each other by pressing the end portions of the circuit board. An insertion pusher that pushes into the circuit board supporting portion of the pair of rising endless belts, a take-out pusher that presses to remove the circuit board supported by the circuit board supporting portions of the pair of facing descending endless belts, and an upper portion of the rising endless belt , A transfer pusher that presses one end of the circuit board whose both ends are supported by the circuit board support part so as to transfer to the circuit board support part of the descending endless belt. It is made.

[Action]

When one end of the circuit board is pressed by the insertion pusher, both ends of the circuit board on which any of the wiring pattern, the resistance film, the insulating protection film, etc. are printed are attached to the pair of opposing endless belts that support the circuit board. Supported by the department. Then, the circuit board rises in the drying oven while being supported by the pair of rising endless belts facing each other. When the circuit board reaches the upper end of the ascending endless belt, the transfer pusher presses one end of the circuit board to transfer it to the opposing circuit board supporting portion of the descending endless belt. Therefore, the circuit board starts descending and reaches the lower end of the descending endless belt. At the lower end of the endless belt, the take-out pusher pushes one end of the circuit board to send the circuit board to the outside of the drying furnace.

Since the circuit board is dried while being raised and lowered by the facing endless belt, the length of the endless belt and the temperature of the hot air sent into the drying furnace may be controlled by the material applied to the circuit board.

Since the drying device is vertical as described above, the floor area can be reduced and the length of the drying furnace can be set regardless of the floor area. Further, since the circuit boards can be conveyed in series, the circuit board supply and removal device can be simplified.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIGS. 1 (a) to 1 (c) are explanatory views of the circuit board drying device according to the present invention, and FIGS. 2 (a) and 2 (b) are operation explanatory views of the circuit board drying device according to the present invention.

In the figure, a pair of opposing rising endless belts 2 and a pair of opposing descending endless belts 3 which are coaxial with the rising endless belt 2 and counter-rotate are fixed on a base 1 by a supporting device 4. ing. For example, as shown in FIG. 1 (b), the ascending and descending endless belts 2 and 3 made of a chain 16 are supported by upper and lower sprocket gears 5. The ascending and descending endless belts 2 and 3 are driven by the sprocket gears 5, and are continuously provided with circuit board supporting portions 7 capable of supporting both ends of the circuit board 6. The circuit board support portion 7 is composed of a large number of L-shaped support plates that extend horizontally from the rising and falling endless belts 2 and 3 and support both ends of the circuit board 6.
Further, the ascending and descending endless belts 2 and 3 are connected to the driving device 8
Driven by a pitch sensor (not shown) and controlled to a desired constant speed.

One end of the circuit board 6 to be dried is pressed by the insertion pusher 9 and placed on the circuit board support portion 7 of the pair of opposing rising endless belts 2. Also, transfer pusher 10
Presses one end of the circuit board 6 in order to transfer the circuit board 6 supported by the circuit board supporting portion 7 to the pair of facing downward endless belts 3. When the circuit board 6 is taken out from the descending endless belt 3, the take-out pusher 11
(See FIG. 2) presses one end of the circuit board 6 and sends it out from the descending endless belt 3. The insertion pusher drive device 12 drives the insertion pusher 9 by changing its rotational movement into a linear movement by a gear mechanism (not shown).
Further, the insertion pusher drive device 12 may be a linear motor or another cylinder using pneumatic pressure or hydraulic pressure.

The pair of opposed rising and falling endless belts 2, 3
Is provided with a heat insulating cover 13 on the base 1, into which hot air is sent from a hot air generator 14 through a hose 15.

In the circuit board drying device having the above-described configuration, the circuit board 6 on which the wiring pattern, the resistance film, the insulating protection film, or the like is printed is supplied onto the insertion pusher 9 of the base 1 from a supply device (not shown).

The insertion pusher 9 detects the circuit board 6 by a sensor (not shown) and drives the insertion pusher driving device 12. When the insertion pusher drive device 12 presses one end of the circuit board 6 as shown in FIG. 2 (a), both ends of the circuit board 6 project from the pair of rising endless belts 2 facing each other. It is supported by the support portion 7 (see FIG. 1).

Then, the circuit board 6 is transferred upward, and the circuit board 6 is sent to the rising endless belt 2 by the same operation one after another. When the circuit board 6 reaches the upper part of the ascending endless belt 2, the transfer pusher 10 as shown in FIG.
The circuit board 6 is transferred to the circuit board supporting portion 7 of the descending endless belt 3 by the pressing operation of. The circuit board 6 is lowered by the pair of facing endless belts 3, and when it reaches the lower end, the take-out pusher 11 operates to take out to the outside as shown in FIG.

The circuit board 6 is dried by the hot air from the hot air generator 14 while being fed to the rising endless belt 2 by the insertion pusher 9 and then taken out by the take-out pusher 11.

The ascending endless belt 2 and the descending endless belt 3 or the circuit board supporting portion 7 have different drying temperatures depending on the material applied to the circuit board 6, and therefore, a material suitable for the temperature of the drying line is used.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Various design changes can be made without departing from the present invention described in the claims.

For example, the endless belt, the circuit board supporting portion, the pusher, the pusher driving device, and the like are not disclosed in detail, but any modification can be adopted by a known technique.

〔The invention's effect〕

According to the present invention, the circuit board can be dried for a desired time regardless of the floor area by a simple structure in which the drying process of the drying device is vertical and only one end of the circuit board is pressed by the pusher.

Further, according to the present invention, since the circuit board is supported between the pair of opposed endless belts, the circuit boards can be conveyed in series,
The transport device does not become complicated and can be easily connected to other automatic lines.

[Brief description of drawings]

1 (a) to (c) are explanatory views of a circuit board drying device according to the present invention, and FIGS. 2 (a) and (b) are operation explanatory diagrams of a circuit board drying device according to the present invention, and FIG. 3 (a) and FIG. (B) is a circuit board drying device explanatory view in a conventional example. 1 ...... Base 2 ...... Ascending endless belt 3 ...... Falling endless belt 4 ...... Supporting device 5 ...... Sprocket 6 ...... Circuit board 7 ...... Circuit board supporting part 8 ...... Driving device 9 ...... Inserting pusher 10 ... … Transfer pusher 11 …… Removal pusher 12 …… Insertion pusher drive device 13 …… Insulation cover 14 …… Hot air generator 15 …… Hose 16 …… Chain

Claims (1)

[Claims] 1. In a circuit board drying apparatus for sending hot air into a drying oven to continuously dry circuit boards in series, the circuit board supporting portions 7 supporting both ends of the circuit board 6 are continuously opposed to each other. Pair of rising endless belts 2 arranged at
And a pair of descending endless belts 3 that are arranged so as to confront the circuit board supporting portions 7 that support the opposite ends of the circuit board 6 and that rotate in the opposite direction coaxially with the ascending endless belt 2. Insertion pusher 9 pushed into the circuit board supporting portion 7 of the pair of ascending endless belts 2 by pressing the end portions of the two, and the circuit board supported by the circuit board supporting portion 7 of the pair of descending endless belts 3 facing each other A take-out pusher 11 for pushing out to take out 6 and an upper end of the ascending endless belt 2, one end of the circuit board 6 whose both ends are supported by the circuit board supporting part 7 are transferred to the circuit board supporting part 7 of the descending endless belt 3. A circuit board drying device, comprising: