JP2714300B2 - Printed circuit board support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table having a plurality of backup pins for supporting a printed circuit board from a lower surface, and a pair arranged above the table for receiving the printed circuit board from upstream and placing it at a predetermined position. And a vertically moving means for changing a relative perspective relationship between the pair of transport chutes and the table.

[0002]

2. Description of the Related Art A supporting device for a printed circuit board of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 3-24797. According to this technique, when the detecting unit detects an obstacle such as a backup pin within the moving range of the transport chute that moves in accordance with the size of the printed circuit board, the movement of the chute is stopped, and the chute moves. The transport chute is prevented from colliding with the obstacle.

[0003]

However, in the prior art, in consideration of the overrun at the time of the movement of the transport chute, it is inevitable that the detecting means detects an obstacle and immediately stops the movement of the transport chute. Can not be achieved,
Also, considering the location of the detection means, backup pins cannot be provided near the transport chute, and the mounting density of electronic components on a printed circuit board cannot be increased.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a table having a plurality of backup pins for supporting a printed circuit board from a lower surface, and a printed circuit board disposed above the table and receiving the printed circuit board from an upstream position. In a printed circuit board support device comprising a pair of transport chutes to be mounted and up and down moving means for changing a relative perspective relationship between the pair of transport chutes and the table, an interval between the pair of transport chutes is Adjusting means for adjusting to the width, and control means for controlling the adjusting means to adjust to the width of the printed circuit board in a state where the backup pin and the transport chute of the table are separated by the vertical moving means. Are provided.

[0005]

In the state where the backup pin and the transfer chute of the table are separated by the vertical moving means,
The control means controls the adjusting means to adjust the interval between the pair of transport chutes according to the width of the printed circuit board.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(1) A component suction nozzle in an electronic component mounting device, which can move between a component supply device (not shown) and a support device (3) for a printed circuit board (2) and can also move up and down. Therefore, the suction nozzle (1) picks up an electronic component from a predetermined position, moves to a position above the supporting device (3), and then descends to mount the electronic component on the printed circuit board (2).

Next, the support device (3) for the printed circuit board (2) will be described.

(4) and (5) are a pair of parallel transfer chutes arranged on the chute support member (6), and a printed board (2) which is moved by an unshown transfer mechanism from an upstream device (not shown). ) Groove at both ends (7)
Guide while supporting in (8).

Reference numeral (9) denotes a base, and guide rails (10) and (11) parallel to each other are provided on both side walls on which the base (9) stands.
Is formed, and an X-direction moving table (14) in which a screw shaft (13) rotated by an X-direction moving motor (12) is fitted to a nut thereof is used as the guide rail (10) (1).
It becomes movable in the X direction via the sliders (15) and (16) fitted in 1).

The X-direction moving table (14)
The guide rails (10) (1)
Guide rails (1) parallel to each other in a direction orthogonal to (1)
7) A (18) is formed, and a Y-direction moving table (21) in which a screw shaft (20) rotated by a Y-direction moving motor (19) is fitted to its nut portion is used as the guide rail (17) (18). ) To fit the slider (22) (2)
It becomes possible to move in the Y direction via 3). Therefore, the printed circuit board (2) supported by the transport chutes (4) and (5) can move in the XY directions as a result.

On the upper surface of the Y-direction moving table (21), there are provided a plurality of backup pins for supporting the printed circuit board (2) supported by the pair of transport chutes (4) and (5) from below. (24) is provided in a hole (not shown) so that it can be pulled out. That is, according to the size (in the Y direction) of the printed circuit board (2), or when electronic components are already mounted on the back surface of the substrate (2), avoiding the components, the pins (24) are It is inserted and removed in consideration of the number and position.

Reference numeral (25) denotes an elevating lever which swings on the X-direction moving table (14) with the support shaft (26) as a fulcrum. A roller (27) is provided at the other end. (28) engages with a rod of a lifting cylinder (29) provided on the base (9). An engaging portion (30) for engaging with the roller (27) is provided on an outer portion of the chute support member (6). A guide shaft (31) projecting below four corners of the support member (6) penetrates a guide portion (32) of the Y-direction moving table (21) so as to be vertically movable.

Reference numeral (33) denotes a board width changing motor (servo motor). A belt (36) is stretched between a driving pulley (34) and a driven pulley (35). Poo
The screw shaft (37) is connected to the rim (35). A nut (38) at the other end of the screw shaft (37) is provided on the outer side of the transport chute (4). Accordingly, the screw shaft (37) is rotated via the pulleys (34) and (35) by the driving of the motor (33), and the guide rails (39) and (40) provided on the support member (6). Along one of the transport chutes (4) via sliders (4A) and (4B)
Becomes movable with respect to the other transport chute (5).

Next, in FIG. 3, reference numeral (41) denotes a CPU (microcomputer) as control means,
According to the program stored in (42), the RAM (4
The operation related to component mounting is controlled based on various data stored in 3). The CPU (41) controls each drive source such as the motor (33) and the cylinder (29) via an interface (44) and a drive circuit (45). The board width is set in the RAM (43) according to the type of the printed board (2), and the board width is stored. (46) is a limit switch for detecting the lower limit of the transport chutes (4) and (5), and is provided on the Y-direction moving table (21).
(47) a descent timer, which is set simultaneously with the start of the descent of the transport chutes (4) and (5) by the cylinder (29) after the completion of the movement of the transport chute (4) according to the type of the printed circuit board (2). And the shoot (4) (5)
Is reset when the limit switch (46) is operated by the support member (6). The timer (47) has a time-up time set slightly longer than the normal time required for the shoots (4) and (5) to descend, and if the time-up occurs for any reason, the abnormality indicator ( 48) is displayed to inform the operator. (49) is a reflection type board detection sensor which detects whether or not the printed board (2) is present on the transport chutes (4) and (5).
1) does not send an operation command to the motor (33).

The operation of the present invention with the above configuration will be described below.

First, as shown in FIG. 4, in a state where the pair of transport chutes (4) and (5) are raised, the printed circuit board (2) is moved by an unshown transfer mechanism by an upstream apparatus (not shown). Groove (7) of the chute (4) (5)
The printed board (2) is conveyed while sliding in (8), and is stopped by a positioning device (not shown) after stopping at a predetermined position. Thereafter, when the cylinder (29) is operated and the rod is retracted, as shown in FIG. 5, the transport chutes (4) and (5) are lowered by their own weight while the guide pin (31) is guided by the guide portion (32). I do. Therefore,
Backup pins (24) disposed on the upper surface of the Y-direction moving table (21) support the lower surface of the printed circuit board (2) and horizontally support the substrate (2).

In this state, the suction nozzle (1) picks up and mounts a predetermined electronic component from the component supply device at a predetermined position on the printed board (2). That is, since the suction nozzle (1) is disposed at a predetermined interval on the periphery of the rotating disk that is intermittently rotated by the index device, the nozzle (1) always stops at a predetermined position in the mounting station. However, the printed board (2) is moved by the X-direction moving table (14) and the Y-direction moving table (21), and the desired position (RA
(According to the position stored in M (43)). That is, the X-direction moving table (14) is moved by the X-direction moving motor (12) to the slider (15).
The Y-direction moving table (21) is moved along the guide rails (10) and (11) via the sliders (22) and (23) by the Y-direction moving motor (19) via the sliders (22) and (23). The component is mounted while moving along (18). At this time, the transport chute (4)
In (5), since it is lower than the transport level of the upstream device and the downstream device, it is possible to move in the XY directions without colliding with these devices.

When the mounting of all components on the printed circuit board (2) is completed, both tables (14) and (21)
After returning to the home position, the cylinder (29) is actuated to swing the elevating lever (25) clockwise about the support shaft (26) as shown in FIG.
The transport chutes (4) and (5) are raised through the engaging portions (30) engaged with the transport chutes (4) and (5) by the transfer mechanism after the positioning by the positioning device is released. 5) The upper printed circuit board (2) is discharged to a downstream device (not shown), and another printed circuit board (2) is simultaneously transferred from the upstream device to the transfer chute (4).
(5) It is transported upward, and the component mounting operation as described above is repeated.

Next, an operation in the case of handling printed circuit boards (2) of different types will be described.

First, an operation unit (not shown) is operated to designate a desired type of printed circuit board (2), and automatic setup change is started. At this time, the transport chutes (4) and (5)
The presence or absence of the substrate (2) on the substrate detection sensor (4)
9) and if "none" is detected, the transport chutes (4) and (5) are in a raised state (as shown in FIG. 4, the Y-direction moving table (21) and the transport chutes (4)).
(5) is far away and at the same level as the transport level of the upstream device / downstream device) under the CPU (4).
1) reads the size of the board width corresponding to the designated printed board (2) from the RAM (43), and reads the motor (3).
An operation command is given to 3). Then, the drive pulley (3)
4) The screw shaft (37) is rotated via the driven pulley (35) and the belt (36), and the transport chute (4) is moved relative to the other transport chute (5) by the sliders (4A) (4).
It is moved along the guide rails (39) and (40) via B) to obtain the state shown in FIG. The sensor (4
If 9) detects the presence of the board (2) as "present", the above-described setup change operation is not performed.

After the movement of the transport chute (4) by the motor (33) is completed (when the distance to be moved and the moved distance match by an encoder function (not shown) of the servo motor), the upstream side A small printed circuit board (2) is received from the side device. Then the CPU (41)
Issues an operation command to pull the rod into the cylinder (29) and sets the descent timer (47).
Therefore, as shown in FIG. 7, the transport chutes (4) and (5) descend by their own weight as described above. Due to this descent, the limit switch (46) comes into contact with the support member (6) to detect the descent of the transport chutes (4) and (5).
7) will be reset.

At the time of this automatic setup change, it is necessary to pull out the backup pin (24) within the moving range of the transport chute (4) from the Y-direction moving table (21) in advance, but it is erroneous. The operation when not removed will be described below.

After the transfer chute (4) has been moved, the printed circuit board (2) having a small width is received from the upstream apparatus, and then the cylinder (29) is operated by the command of the CPU (41) to operate the transfer chute as described above. (4) When (5) drops, the transport chute (4) rides on the backup pin (24) that has not been pulled out. Therefore, the limit switch (46) is connected to the transport chute (4).
Without detecting the drop of (5), the drop timer (47) times out and outputs a time-up signal. Then, the CPU (41) receiving the signal causes the abnormality indicator (48) to display the fact that there is an abnormality, and notifies the operator of the fact.
At the same time, the CPU (41) outputs a drive signal to the cylinder (29), and swings the elevating lever (25) clockwise as described above, so that the chute support member (6) and the transport chute (4) ( 5) is raised. Thereafter, when the lifting of the transport chutes (4) and (5) is completed (detected by a limit switch (not shown)), the timer (47) is reset, and the worker is backed up below the transport chute (4). This can be dealt with by removing the pin (24) from the Y-direction moving table (21).

Thereafter, the cylinder (29) may be operated again to retract the rod, and the transport chutes (4) and (5) may be lowered.

[0026]

As described above, according to the present invention, when handling printed circuit boards having different widths, even when the transfer chute is changed in setup,
The movement of the chute can be performed at a high speed, and a backup pin can be provided in the vicinity of the transfer chute, so that the mounting density of electronic components on a printed circuit board can be increased. Furthermore, compared to the technique disclosed in Japanese Patent Application Laid-Open No. 3-24797, a support device for a printed circuit board having a simple structure and being inexpensive can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic side view for explaining the operation of the present invention.

FIG. 2 is a perspective view of the support device of the present invention.

FIG. 3 is a control block diagram showing one embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view of the support device of the present invention in a state of receiving a printed circuit board from an upstream device.

FIG. 5 is a vertical cross-sectional side view of the support device of the present invention in a state where the printed circuit board is horizontally supported by backup pins.

FIG. 6 is a vertical sectional side view of the support device of the present invention immediately after the setup change.

FIG. 7 is a longitudinal sectional side view of the support device of the present invention in a state where the transport chute is lowered after the setup change.

FIG. 8 is a flowchart showing the operation of the support device of the present invention.

[Explanation of symbols]

 (2) Printed circuit board (3) Supporting device (4) Transport chute (movable side) (5) Transport chute (fixed side) (14) X direction moving table (21) Y direction moving table (24) Backup pin (25) Lifting lever (29) Lifting cylinder (vertical moving means) (31) Guide shaft (32) Guide part (33) Board width changeover motor (41) CPU (control means) (43) RAM (46) Limit switch (47) Descent timer (48) Abnormality display

Claims (1)

(57) [Claims] A table having a plurality of backup pins for supporting a printed circuit board from a lower surface, a pair of transfer chutes arranged above the table for receiving the printed circuit board from upstream and placing it on a predetermined position; In a printed circuit board support device including a pair of transport chutes and a vertical moving unit that changes a relative perspective relationship between the table and the table, an adjusting unit that adjusts an interval between the pair of transport chutes according to a width of the printed substrate, By the vertical moving means
Backup pin and transfer shoe of the table
And a control means for controlling the adjustment means to adjust it to the width of the printed circuit board while being separated from the printed circuit board.