JPH0344981B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to the transportation of printed circuit boards used in electronic devices, and particularly to the board feeding mechanism used in the transportation of circuit boards in automatic mounting devices for electronic components. The present invention relates to a substrate transfer device that corrects and detects slack in wires used.

(B) Prior Art Generally, in automatic mounting equipment for electronic components, a board feeding device that transports a printed circuit board along a guide rail to a predetermined position performs a predetermined operation at the predetermined position, such as applying a mounting agent. After completing the coating or the master work of mounting electronic components on the printed circuit board, a configuration is often adopted in which the next printed circuit board is transported.

As an example, there is a printed circuit board transfer device shown in Japanese Patent Application Laid-open No. 57-139988, in which an arm 40
9 is configured to transport and unload the printed circuit board by the operation of a cylinder 412.

Also, in recent years, various substrate feeding devices have begun to adopt a method in which a lever for substrate feeding is moved by a wire.

(c) Problems to be Solved by the Invention In the first conventional example described above, the loader 300 as a guide rail for the printed circuit board is made of steel, and even if the printed circuit board gets caught during transportation,
Since it cannot be detected or the conveying force cannot be absorbed, there is a drawback that the printed circuit board is damaged.

In addition, in the second conventional example, when the board feeding lever is attracted by a spring in the feeding direction, if the printed circuit board fails to get caught on the guide rail for some reason, the wires may become slack, and the board may be moved further. There was a drawback that the substrate was suddenly pulled by the pulling force on the lever as soon as the grip was removed, resulting in damage.

(d) Means for Solving the Problems Therefore, the present invention provides a substrate transfer device in which a substrate guided between a pair of guide rails is moved by a feeding member along the guide rails in a fixed transfer direction. , a biasing means for biasing the feeding member to move in the substrate conveying direction, one end of which is coupled to the feeding member and the other end to a drive source, and the forward movement of the drive source is caused by the biasing force of the biasing device; A linear member that moves the feeding member to convey the substrate and returns the feeding member to the initial position in a backward motion, a slack absorbing member that absorbs slack in the linear member, and absorption of slack in the linear member by the absorbing member. a detection device that detects a motion; and a detection device that detects a movement of the linear member; and a control means for setting the drive source in an inoperable state when a detection device detects an action of absorbing the slack by the absorbing member when the absorbing member loosens.

(e) Effect When the drive source moves forward, the feeding member is moved by the biasing force of the biasing means, and when the board is transported, the feeding member stops due to the board catching on the guide rail, and the linear member becomes slack. If so, the slack absorbing member absorbs the slack. At this time, when the detection device detects the absorbing operation of the slack absorbing member, the control means makes the drive source inactive.

(F) Embodiments The present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a substrate transfer device of the present invention, FIG. 2 is an enlarged perspective view of the main part of the device, and FIGS. 3 and 4 are A front view of the main parts of the device is shown.

Next, in the drawing, 1, 1 is a printed circuit board,
2, 2 are guide rails, 3 is a slider having pins 4, 4 as feeding members, 5 is a ball spline shaft, 6 is a rotating lever, 7 is a cylinder that drives the rotating lever, and 8 is a coupling provided on the slider. Pieces 9 and 10 each include a first biasing spring whose one end is attached to the coupling piece, and a wire as a linear member; 11 is an arm for moving the wire;
12 is a motor as a driving source for rotating the arm; 13, 13 are pulleys; 14 is a detection lever provided between the arm and the connecting piece to detect the tension or slack state of the wire; 15 is an attachment. 16 is a micro switch as a detection element having a pressing rod 17 that is pressed against the detection lever in a normal state; 18 and 19 are rollers that clamp the wire; 20 is a support plate 21; a support shaft rotatably holding the detection lever; 2;
2 and 22 indicate lead wires that electrically connect the detection element to the control section 23.

The micro switch 16 and the detection lever 14
When the wire 10 becomes slack, the rotation of the detection lever 14 activates the micro switch 16 to de-energize the motor 12 and stop it. The detection lever 14 having rollers 18 and 19 and the spring 15 constitute a slack absorbing member, and even if the wire 10 becomes slack, the biasing force of the spring 15 causes the detection lever 14 to rotate, thereby absorbing the slack.

Next, the operation will be explained. First, during normal operation, as shown in FIGS. 1 and 3, the wire 10 is stretched from the connecting piece 8 of the slider 3 to the arm 11 without loosening. 1
1 rotates the motor 12 from the position shown in FIG. Move towards C,
Along with this, the pins 4, 4 at the tip of the slider 3
Therefore, the printed circuit boards 1 and 1 are also moved in the direction of the arrow C.
move towards.

At this time, the slider 3 is normally fed by one printed circuit board 1 by the rotation of the motor 12.

Thereafter, as the lever of the cylinder 7 is lowered, the rotary lever 6 rotates clockwise, the pole spline shaft 5 rotates clockwise, the slider 3 similarly rotates clockwise, and the pins 4, 4 are rotated clockwise. The printed circuit boards 1, 1 are removed from the pin holes 24, 24 of the printed circuit boards 1, 1, and the printed circuit boards 1, 1 are fed simultaneously or one by one and placed on a conveyor belt (not shown) such as a belt conveyor, and are discharged or transferred to the next one. sent to the process.

On the other hand, if the printed circuit boards 1, 1 are caught on the guide rails 2, 2 or stopped for some reason, the wires 10 become slack. In this case, as shown in FIG. 4, the detection lever 14 rotates clockwise about the support shaft 20 due to the biasing force of the second spring 15. As a result, the detection lever 14
All or part of the slack of the wire 10 can be corrected by the stroke amount due to the rotation of the wire 10, and at the same time, the micro switch 16 as a detection element is activated, so that the control section 23 connected to the micro switch 16 is activated. 16 is set to either open or close, a control signal from this is applied, and the motor 12 connected to its output side stops.

In this state, the operator removes any or both of the substrates 1, 1 from being caught.

Therefore, when the wire 10 returns to its normal tensioned state, the detection lever 14 rotates counterclockwise again about the support shaft 20 against the biasing force of the second spring 15. The detection lever 15 comes into contact with and presses the pressure rod 17 of the microswitch 16 as a detection element, so that the microswitch 1
6, the motor 12 rotates and returns to normal operation, and the printed circuit boards 1, 1 are sent to the left in FIG.

Next, when the slider 3 is rotated by the cylinder 7 in the same manner as described above, the pins 4, 4 of the slider 3 and the pin holes 24, 24 are disengaged, and the biasing force of the first spring 9 is released. Against this, the motor 12 rotates and the wire 10 moves to the right in FIGS. 1 and 3, and is set on the next printed circuit board. The pins 4, 4 for the substrate 1 can perform the same operation even if they press the edges of the substrates 1, 1.

Thereafter, if the substrates are fed in the normal state, the slider moves the substrates one by one from right to left as shown in FIG.

(G) Effects of the Invention As described above, the present invention provides a system in which even if the feeding member stops and the linear member slackens due to the substrate getting caught on the guide rail, the absorbing member absorbs the slack, and this absorbing operation is also carried out. When the detection device detects this, the drive source is deactivated and the linear member is prevented from loosening further, so if the drive source is not stopped and the linear member is loosened further when the board is unlatched. Compared to the above, the distance over which the feeding member rapidly moves due to the urging force of the urging means is shorter, and the impact on the substrate can be reduced.

In addition, when the detection device detects the absorbing operation of the absorbing member, the drive source is deactivated, so the operation continues and the next substrate is transferred, so that the next substrate is placed on top of the stopped substrate. Damage to the substrate due to collision can be prevented.

Therefore, according to the apparatus of the present invention, the substrate can be transported safely and without being damaged.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the substrate transfer device of the present invention, and FIG.
The figure is an enlarged view of the main part showing the detection means used in the device, and FIGS. 3 and 4 are front views of the main part of the device. Explanation of main drawing numbers, 1...Printed circuit board, 2...
Guide rail, 3... slider, 8... coupling piece, 9... first spring, 10... wire, 14
...Detection lever, 16...Micro switch, 1
7...Press rod.

Claims (1)

[Claims] 1 A feeding member engaged with a substrate guided between a pair of guide rails by a contact/separation means moves the substrate along the guide rail in a fixed conveyance direction, and after the movement of the substrate is completed, the feeding member engages with the substrate guided between a pair of guide rails. In a substrate transporting device in which the feeding means detached from the substrate by the separating means returns to its initial position, the feeding means urges the feeding member to move in the substrate carrying direction; one end of the feeding member is connected to the driving source; When the drive source moves forward, the urging force of the urging means causes the approaching and separating means to move the feeding member engaged with the substrate to convey the substrate, and in the backward movement, the approaching and separating means moves the feeding member engaged with the substrate. A linear member that returns the feeding member detached from the substrate to its initial position, a slack absorbing member that absorbs the slack of the linear member, and a detection device that detects an operation of absorbing the slack of the linear member by the absorbing member. When the feeding member is moved by the urging force of the urging means in the forward movement of the drive source, the feeding member stops due to the substrate catching on the guide rail and the linear member becomes slack. A substrate transporting apparatus, comprising: a control means for disabling the driving source when the detecting device detects an action of absorbing slack by the absorbing member.