JPH0249499A - Electronic component automatic insertion device - Google Patents

Abstract

PURPOSE:To enable the sure detection of the defective insertion of a lead pin by a method wherein a chuck pawl and a stopper are provided, and the detection is made to find if the insertion of the lead pin is defective or non-defective depending on the distance of descent of the chuck to the reference distance of the chuck which is set considering a specified distance. CONSTITUTION:A chuck pawl 16 capable of opening or closing freely, which holds a lead pin 30 of an electronic component 25 from its sides, and a stopper 33 formed into a solid structure with the chuck pawl 16, which is positioned at a specified distance A above the component main body 25, are provided. When the tip of the pin 30 can not be inserted bearing on the surface of a printed wiring board 31, an inserting head 2 is made to stop descending, because the torque of a motor 6 is so controlled as to be small enough not to bend the pin 30. That is, when the distance l of descent is smaller than a distance B, a control section 10 detects that the insertion is defective. By this setup, the defective insertion of a lead pin can be surely detected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is particularly effective when applied to an automatic insertion device for electronic components, especially automatic insertion of a type in which electronic components are mounted by inserting lead pins into a printed wiring board. related to technology.

[Conventional technology]

An example of this type of insertion failure detection technique described is Japanese Patent Application Laid-Open No. 62-62591 by the present applicant.

In the above publication, the applicant grips a lead pin protruding from the side of an electronic component with a chuck claw, lowers the chuck claw to a predetermined height position on the top surface of a printed wiring board, and stops the chuck claw at this position. We proposed a technology in which the main body of the electronic component is pressed toward the surface of the printed wiring board using a pusher while the pusher remains in place, and whether the insertion is successful or not is detected based on the amount by which the pusher can descend.

[Problem to be solved by the invention]

However, in subsequent research by the present inventor, it was discovered that it is necessary to more accurately detect whether the tip of the lead pin is inserted into the insertion hole of the printed wiring board.

That is, the most common dual
Taking an example of an electronic component having an in-line package shape, the spread angle of the lead pins provided to the automatic insertion device varies depending on the product and type. Therefore, depending on the electronic component, when the lead pin is gripped by the chuck claws from both sides, the gripping force varies depending on the angle variation. Therefore, due to an increase in the frictional force between the lead pin and the inner wall of the insertion hole of the printed circuit board, this frictional force becomes larger than the insertion force, causing upward sliding of the electronic component between the chuck jaws, which actually results in incorrect insertion. Despite this, there were many cases where it was erroneously detected that the insertion was successful due to the lowering of the chuck jaw by a predetermined amount.

The present invention has been made in view of the above-mentioned problems, and its purpose is to reliably detect whether the insertion is good or bad at the time of insertion;
The objective is to improve the reliability of mounting electronic components onto printed wiring boards.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief overview of typical inventions disclosed in this application is as follows.

That is, the electronic component has an openable and closable chuck claw that grips the lead pin of the electronic component from the side, and a stopper that is formed integrally with the chuck claw and is disposed at a predetermined distance A above the main body of the electronic component. The quality of insertion is detected based on the lowering amount β of the chuck jaw relative to the reference lowering amount B, which is set in consideration of a predetermined distance A.

[Effect]

According to the above-mentioned means, since the structure has a stopper that is formed integrally with the chuck jaw and is placed above the main body of the electronic component with a predetermined pressure ili'IA, the chuck jaw is gripped by the lowering of the chuck jaw. Even if a slip occurs in the lead pin that has been moved, the maximum slip (2) will be smaller than the above-mentioned predetermined distance. Therefore, by setting the reference lowering amount B in consideration of the distance nA in advance, it is possible to reliably detect whether the insertion is good or bad based on the lowering amount l of the chuck claw.

〔Example〕

Fig. 1 is a partially sectional front view of the insertion head of an automatic electronic component insertion device which is an embodiment of the present invention, Fig. 2 is the same (side view), and Fig. 3 is a side view of the insertion head of an automatic electronic component insertion device according to an embodiment of the present invention. 4(a) to 4(C) are explanatory diagrams showing stepwise the insertion state of the electronic component according to the present embodiment; FIG. 5 is an explanatory diagram showing the state in which slippage has occurred; FIG. 6 is an explanatory diagram showing an insertion failure state, and FIG. 7 is an explanatory diagram showing a spread state of leads of an electronic component.

The automatic electronic component insertion device 1 of this embodiment is equipped with an insertion rod 2 shown in FIG. It is attached so as to be slidable in the vertical direction along a rail 4 provided perpendicularly to the axial direction.

The insertion head 2 has a rod-shaped gear 5 at its upper end, and when the rod-shaped gear 5 meshes with the gear 7 of the motor 6 fixed to the arm 3, the rotational motion of the motor 6 becomes a linear motion in the vertical direction. It has a structure in which the insertion head 2 is moved up and down.

The motor 6 is equipped with an encoder 8 that can detect the amount of rotation of the motor 6, and the amount of rotation of the motor 6, that is, the amount of elevation and descent of the insertion head 2, is detected by the moving scene pulse signal from the encoder 8. It is considered possible. The control of these motors 6 and the detection of insertion quality, which will be described later, based on the detection of the amount of rotation, etc., are comprehensively controlled by the control section 10. The insertion rod 2 is moved up and down by the motor 6, and a spring 12 that biases the insertion rod 2 upward is locked between a support shaft 11 protruding from its side and the arm 3. Therefore, the biasing force of the spring 12 is balanced with the weight of the insertion head 2 itself and is pushed downward toward the insertion head 2.

is set to offset the gravity of Therefore, when the insertion head 2 is stopped, the load applied to the gear 7 of the motor 6 is zero, and the insertion force can be easily finely adjusted by changing the drive current value for the motor 6.

The insertion head 2 is composed of a chuck body block 13 and a movable unit 14 that is detachable from the chuck body block 13, and the movable unit 14 is further movable horizontally with respect to the moving direction of the chuck body block 13. It is composed of a pair of opening/closing blocks 15 and a pair of chuck claws 16 at the tips of the opening/closing blocks 15 that are opened and closed in conjunction with the opening/closing blocks 15.

The chuck body block 13 is provided with a cylinder mechanism 17 that is movable in the vertical axis direction. It has a piston rod 18. The tip of the piston rod 18 formed in the shape of an inverted cone is attached to the opening/closing block 15 in a movable state so as to protrude from the opening/closing block 15 by the operation of the cylinder machine 117, and when the piston rod 18 is protruded, its conical surface 18a It has a structure in which it comes into sliding contact with a pair of rollers 20 installed inside the upper end of the opening/closing block 15, and moves the rollers 20 to expand. Therefore, when the piston rod 18 is pushed downward by the downward operation of the cylinder mechanism 17, this movement in the vertical axis direction is converted by the rollers 20 into a movement of expanding the opening/closing block 15 along the guide shaft 21. The structure is such that a chuck claw 16 linked to an opening/closing block 15 is opened. On the right, the opening/closing block 15 is
In a normal state, the movable unit 14 is biased toward each other by biasing elements such as the spring 22, that is, the movable unit 14 is in a closed state.

In the cylinder mechanism 17, a bushing rod 23 is located at the axial center of the piston rod 18.
The butcher rod 23 is formed through the bushing rod 23 so as to be movable in the vertical axis direction independently of the bushing rod 8, and a pusher panno 24 on the block is provided at the tip (lower end) of the bushing rod 23. As described above, the vertical movement of the punch rod 23 is controlled independently from the piston rod I8 by an air cylinder (not shown) outside the insertion head 2.

Next, the structure of the chuck claw 16 attached to the tip of the opening/closing block 15 will be explained in more detail with reference to FIG.

The chuck jaws 16 shown in FIG. 3 are used to grip a DIP type electronic component 25 as an example.

The pair of chuck jaws 16 have upper ends fixed to the opening/closing block 15 and chuck jaw bodies 26 obtained by integrally molding stainless steel, and lower ends of the chuck jaw bodies 26 are bent into an L-shape. The gripping portion 27 is provided with a gripping surface 27a at the tip thereof facing the other gripping surface 2-7a. The electronic component 25 is held between the gripping surfaces 27a with the lead pins 30 protruding downward from the sides of the package body 28 being supported from the outside of the surface. Note that the gripping force at this time is due to the biasing force of the spring 22 described above that biases the chuck claws 16 toward each other.

Here, the lead pin 30 of the DIP type electronic component 25 is
To briefly explain the shape of the electronic component 25, as shown in FIG. When inserting the lead pins 30 into the insertion holes 32 of the printed wiring board 31, both lead pins 30 need to be approximately parallel, that is, at a specified value P.

Generally, in an insertion device using a chuck claw 16, this specified value P at the time of insertion is realized by the gripping force of the chuck claw 16. Therefore, an expanding force is applied to the gripping surface 27a of the chuck claw 16 to cause the lead pin 300 to return to its original spread P'.

A pair of block-shaped stoppers 33 are fixed to the inner surfaces of both chuck claws 16. Stopper 3
3 is obtained by integrally molding synthetic resin, for example, and a recess 33a through which the punch head 24 can pass is formed approximately in the center of the opposing surfaces of both stoppers 33, so that the punch head 24 can pass through even when the chuck claw 16 is closed. 24 vertical movements are possible. The fixed position of the stopper 33 on the chuck claw 16 is a distance A above the upper surface of the package body 28 of the electronic component 25 when the chuck claw 16 grips the electronic component 25 in an ideal state.

Here, the distance A is a distance that satisfies the following conditions. That is, FIG. 4(a) shows the positional relationship at the insertion start position (at the completion of the first step described below) when the chuck claw 16 grips the electronic component 25 in an ideal state (no slippage). There is.

In the figure, distance C is the distance from the tip of lead pin 30 to the board surface of printed wiring board 31, and B is a reference value for the amount of descent of chuck claw 26 (reference amount of descent). That is, when the electronic component 25 is gripped by the chuck jaws 26 in an ideal state, the chuck jaws 26 are at a distance B as shown in FIGS.
The leading end of the lead pin 30 is inserted into the insertion hole 32 of the printed wiring board 31 when the lead pin 30 is lowered by a certain amount. In such a positional relationship, the above A is set to be smaller than the value obtained by subtracting C from B, that is, A<B-C. In other words, by setting A, which is the maximum upward slip 1 of the electronic component 25, to be a smaller value than B-C, even if slip occurs, the lowering of B of the chuck jaw This is to ensure that the tip of the lead pin 30 is inserted into the insertion hole 32 as shown in FIG. 5. Therefore, in this embodiment, if the amount of descent β detected by the control unit 10 can reach a distance equal to B, insertion is successful, but if the tip of the lead pin 30 collides with the surface of the printed wiring board 31, the amount of descent detected If β ends at a distance less than B, an insertion failure can be detected.

Next, a method for detecting whether or not the electronic component 25 is inserted properly using this insertion device will be described in more detail.

First, under the control of the control unit 10, the arm 3 is moved by a moving means of the apparatus main body (not shown) with the electronic component 25 being gripped by the chuck claw 16, and the insertion head 2 is moved.
When the insertion head 2 is positioned above the printed wiring board 31, the motor 6 is driven and the insertion head 2 starts to descend along the rail 4. In this state, the first step is completed when the tip of the lead pin 30 has descended to a predetermined height C from the surface of the printed wiring board 31 (FIG. 4(a)).

Subsequently, after the position of the printed wiring board 31 is corrected based on the position recognition of the lead pins 30 (not shown) by the optical system, the control unit 10 applies a predetermined weak current to the motor 6 to insert the rad. 2 at low speed and low torque. The torque, that is, the downward force at this time, is such a force that even if the lead pins 30 of the electronic component 25 collide with the printed wiring board 31 or the like, the lead pins 30 will not be bent. This bending force needs to be set to a different value depending on the material, width, etc. of the glued pin 30, such as Kovar or 42 alloy.

The control unit 10 constantly detects the cumulative amount of descent of the insertion head 2 by monitoring the movement amount pulse signal from the encoder 8, and controls the motor 6 to stop the descent when the amount of descent β reaches β-B. to complete the second step (see (b) in the same figure).
)).

During the operation of the second step, the lead pin 30
When the lead pin 300 is pushed further into the insertion hole 32 after the tip reaches the top surface of the printed wiring board 1ff1.31, the lead pin 30 may be bent or the lead pin 30 may be misaligned with the insertion hole 32. Hole 3
Since it slides into contact with ``432a'' of 2 and the insertion friction increases,
The friction may be greater than the gripping force of the chuck claws 16. In such a case, the gripped electronic component 25 will slide upward. If such slippage occurs, in this embodiment, the distance i? between the package body 28 and the stopper 33? iA gradually narrowed down and finally reached the fifth
As shown in the figure, the package body 28 and the stopper 3
3 are in contact with each other. However, in this embodiment, as mentioned above, the amount by which the chuck jaws 16 descend! is β-B and B
>A+C, the chuck jaws 16 are further lowered beyond a distance equal to A, which is the maximum sliding amount. Therefore, even if slipping occurs as shown in FIG. 5, the tip of the lead pin 30 is inserted into the insertion hole 32 due to the amount of descent of B. Moreover, in this embodiment, the pressing force by the stopper 33 acts synergistically with the lowering of the chuck claws 16 on the electronic component 25, which makes insertion impossible (insertion failure) in the conventional technology.
will be inserted without fail.

When the insertion operation of the second step is completed, the lowering of the insertion head 2 is stopped, and the cylinder mechanism 17 is subsequently operated, and the piston rod 18 is moved downward as shown in FIG. 4(C). energized. As a result, the roller 20 that is in sliding contact with the conical surface 18a at the tip of the piston rod 18 is moved to expand, the chuck claws 16 are opened, and the grip on the electronic component 25 is released. In this state, the lead pin 30 has already been inserted into the insertion hole 32, and is released from the grip of the chuck claw 16.
Since the electronic components 25 on the printed wiring board 31 are urged in the direction of expanding as shown in FIG. In this state, the air cylinder (not shown) is operated and the butcher rod 2
3 is moved downward, the pusher head 24 presses the package body 28 and the electronic component 25 is pushed into the printed wiring board 31. Next, when the motor 6 is reversely rotated under the control of the control unit 10, the insertion rod 2 is raised and returned to the initial position.

On the other hand, when the lead pin 30 is bent or misaligned with the insertion hole 32 during the insertion operation in the second step described above, the tip of the lead pin 30 comes into contact with the surface of the printed wiring board 31 and cannot be inserted. Since the torque of the motor 6 is controlled to a level that does not bend the lead pin 30 as described above, the lowering of the insertion head 2 is stopped at this stage. That is, as shown in FIG. 6, when the amount of descent β within a predetermined time is less than B, that is, when β is less than B, the controller 10 detects an insertion failure. If such an insertion failure is detected, the motor 6 is rotated in the opposite direction while the chuck claw 16 is closed and the electronic component 25 is gripped.
is raised to its initial position. At this position, the chuck jaw 16
The electronic component 25 is removed from the electronic component 25, or the printed wiring board 1ff31 is re-inserted by position correction.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor.

For example, in this embodiment, the pusher head 24 and the stopper 33 are described as separate members, but the pusher head 24 and the stopper 33 are described as separate members.
It is also possible to have a structure in which the stopper 33 also serves as the stopper 33.

In the above explanation, the invention made by the present inventor was mainly applied to the field of application, which is a so-called DIP type automatic insertion device for electronic components. It can also be used in an automatic insertion device l in an electronic component 25.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, according to the present invention, even if the lead pin gripped by the chuck jaw slips due to the lowering of the chuck jaw, the amount of slippage is kept within a certain range by the stopper. It is possible to reliably detect whether the insertion is good or bad from the drop lβ. Therefore, the reliability of mounting electronic components on the board can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional front view of the insertion head of an automatic electronic component insertion device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the insertion head of the automatic insertion device described above. A side view, FIG. 3 is a perspective view showing the gripping state of an electronic component by the chuck jaws in this embodiment, and FIGS. 4(a) to (C) are explanations showing step-by-step how to insert an electronic component according to this embodiment. Figure 5 is an explanatory diagram showing a state in which electronic components slip in an example. Figure 6 is an explanatory diagram showing a state in which an electronic component is incorrectly inserted in an example. Figure 7 is an explanatory diagram showing a state where electronic components are incorrectly inserted in an example. Figure 7 is an explanatory diagram showing a state where electronic components slip in an example. FIG. ■... Automatic insertion device, 2... Insertion head, 3...
Arm, 4...Rail, 5...Bar-shaped gear, 6...
Motor, 7...Gear, 8...Encoder, lO...
・Control unit, 11... Support shaft, 12... Spring, 1
3... Chuck body block, 14... Movable unit, 15... Opening/closing block, 16... Chuck claw,
17... Cylinder mechanism, 18... Piston Lorado,
18a...Conical surface, 20...Roller, 21...Guide shaft, 22...Spring, 23...Bunshalotsu)', 24...Butsushahet, 25...Electronic component, 26...・Chunk claw body, 27...gripping part, 2
7a...Gripping surface, 28...Package body, 30.
・Lead pin, 31 ・Printed wiring board, 32・
...insertion hole, 32a...inner wall, 33...stopper,
33a... recess. Agent Patent Attorney Daiwa Tsutsui Figure 1 Figure (C) Figure

Claims (2)

[Claims] 1. An automatic insertion device for electronic components that inserts a lead pin protruding from a main body of an electronic component into an insertion hole formed in a substrate, the device comprising: a chuck claw that can be opened and closed to grip the lead pin of the electronic component from the side; and the chuck. and a stopper formed integrally with the jaw and disposed at a predetermined distance A above the main body of the electronic component, and a lowering amount l of the chuck jaw relative to a reference lowering amount B set in consideration of the predetermined distance A. An automatic electronic component insertion device characterized by detecting whether the insertion is successful or not. 2. In claim 1, the distance from the tip of the lead pin to the substrate surface is C, the predetermined distance A is set smaller than the value obtained by subtracting the distance C from the reference descending amount B, and the descending amount l of the chuck jaw is equal to B. 2. The automatic electronic component insertion device according to claim 1, wherein if the lowering amount l is smaller than the distance B, the insertion is determined to be successful, and if the lowering amount l is smaller than the distance B, the insertion is determined to be defective.