JPS60165785A - Device for conveying lead frame for printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lead frame conveyance device used for printed circuit boards, and in particular, a simple and simple conveyance device that does not use holes provided in the lead frame and used for conveyance. A structured device allows the lead frame to be transported.

[Prior art]

As a conventional conveying device for a lead frame for a printed circuit board, there is a chain conveyor type device as described in, for example, Japanese Patent Laid-Open No. 58-180089. The conveyance device includes an endless conveyance chain;
This attachment has an attachment attached to the conveyor chain, and this attachment is provided with a pin that protrudes outward, and by fitting the pin into a hole drilled in the lead frame, the lead The frame is held by a conveyor chain and is conveyed as the conveyor chain moves.

In addition, conveyance using a sprocket using holes in a lead frame, intermittent conveyance using a bar provided with pins, etc. are also known.

[Problems with conventional technology]

However, in such conventional conveyance devices for lead frames for printed circuit boards, since the pitch of the pins or sprocket pins provided in the conveyance chain is constant, one conveyance chain or sprocket has a fixed pitch. It cannot be used for llu feeding of other lead frames with different pinches, and if the hole pinches of the lead frames are different in this way, one feed chain or It is necessary to facilitate sprocketing. Therefore, in this case, Il! ! It is necessary to have a structure in which the feed chain or sprocket can be replaced, which makes the entire device complicated, and the arm of the chain or sprocket 1- is bulky and not only uneconomical, but also the replacement work is troublesome. There was a problem that. Furthermore, if the diameters of the holes are different, problems such as poor fitting between the pin and the hole and looseness may occur, resulting in poor positioning and feeding of the lead frame.

[Purpose of the invention]

This invention was made by focusing on such conventional problems, and it is possible to transport the lead frame in a predetermined direction using a conveyor roll and a guide without using holes provided in the lead frame. The purpose is to solve the problem in item 1 by doing so.

[Structure of the invention]

As shown in the illustrated embodiment, the present invention provides a one-leg feed system in which the lead frame 1 used for the printed circuit board 4Fj, 2 is conveyed while being compressed with a roll 8 or a support stand. , this IJ (! A guide 10 provided on one side in the direction in which the axis of rotation of the feed roll 70 extends and restricts movement of the lead frame 1 in the axial direction of the feed roll 70, The present invention relates to a general feeding device for a lead frame for a printed circuit board in which the axis center line R intersects a direction C perpendicular to the moving direction F of the lead frame 1 at a predetermined angle α.

〔Example〕

The present invention will be explained below based on illustrated embodiments.

1 to 5 show an embodiment of the present invention, and are diagrams relating to an apparatus for inserting a printed circuit board into lead pins of a lead frame that are continuously supplied, and then cutting the lead pins into predetermined dimensions. It is.

First, to explain the structure, reference numeral 1 not shown in FIG. 1 is a lead frame used for a printed circuit board 2 such as a hybrid IC. , an elongated thin plate-like frame body 3;
It consists of a large number of lead pins 4 that protrude from one side of the frame body 3 and are formed at predetermined intervals from each other, and the tip of each lead pin 4 is provided with a contact point 4a that is bent into a bifurcated shape in the vertical direction. ing.

As shown in FIG. 1, this lead frame 1 is wound around a winding drum 6 rotatably supported by a support frame 5, and the winding end of the lead frame 1 is pinched from above and below. The lead frame 1 is pulled out from the winding drum 6 by a pair of rollers consisting of a conveyance roll 7 and a free roll 8, which are placed opposite each other under the lead frame 1.

As shown in FIG. 2, the conveyance roll 7 and the free roll 8 include a disc-shaped roll body 9a, and this roll body 9.
A rubber-like member 9b made of rubber or rubber-like synthetic resin or the like is fixed continuously in the circumferential direction so as to cover the outer periphery of a.
They are each composed of A free roll 8 is arranged above the transport roll 7, and the frame body 3 of the lead frame 1 is inserted between both rolls 7.8.

As shown in FIG. 3, the axial center line R of the rotating shaft of the IM feed roll 7 is installed to intersect a direction C orthogonal to the conveyance direction F of the lead frame 1 at a predetermined angle α, and as shown in FIG. It is rotated at a predetermined position by an electric motor that does not operate. An electric motor drive stop circuit 23 is connected to this electric motor, and its drive is temporarily stopped by a control signal from a control circuit 15, which will be described later. - Also, the axial center line of the rotating shaft of the free roll 8 is arranged to intersect with the direction C orthogonal to the conveying direction F of the lead frame 1 at a predetermined angle α, similar to the axial center line R of the +U feed roll 7. ing. The free roll 8 is configured to be rotatable and movable in the vertical direction, and is normally urged toward the transport roll 7 by a spring (as shown in the figure) or the like.

A single roller consisting of such a conveyance roll 7 and a free roll 8
1 roller is connected to 4 rollers in series in the direction of movement of lead frame 1.
It is lined with silk.

Furthermore, lul! This is an example of the direction in which the rotating axis R of the feed roll 7 extends, and on the side where there is an intersection A between the axis R and the orthogonal direction C, there is a direction in which the lead frame 1 is moved in the axial direction. A guide 10 is provided to limit the This guide 10 is formed continuously so as to face one side of the four sets of rolls, and the lead frame 1 is moved in the IIEI feeding direction F while one side surface is in sliding contact with this guide 10. .

Further, in FIG. 1, 11 is a lead pin cutting device, and this lead pin cutting device 11 has a pin cutter drive circuit 19, and cuts a predetermined unnecessary lead pin 40 among the lead pins 4 provided on the lead frame. Therefore, in relation to this lead bin detection device 11, U-
A pin detecting device 12 is provided to detect the number of V pins 4, and a lead pin cutting device 11 is operated based on a detection signal from the lead pin detecting device 12 to cut and fold unnecessary lead pins 40. There is.

As shown in FIG. 5, the lead pin detection device 12 includes a pin sensor 13 such as an optical sensor and a lead pin counter 14 to which a detection signal from the pin sensor 13 is supplied. The number of lead pins 4 is detected by counting the pulse signal generated by the viewing pin sensor 13 using a lead pin counter 4. A detection signal from the lead pin detection device 12 is supplied to a control circuit 15. This control circuit 15 is supplied with a reference pin setting signal from a reference pin setting circuit 16 in addition to the detection signal. The reference pin setting circuit 16 is composed of, for example, a variable voltage source, and outputs a reference pin setting signal in the form of a digital signal corresponding to the number of lead pins 4 to be left.

Therefore, by adjusting the output signal from this reference pin setting circuit 16, the set number of reference pins can be freely changed.

The control circuit 15 includes, for example, a digital comparator, and performs lead pin cutting to cut unnecessary lead pins 40 based on the detection signal from the lead bin detection device 12 and the reference pin setting signal from the reference pin setting circuit 16. A drive current is output to the pin cutter drive circuit 19 of the device 11. As a result, the lead pin cutting device 11 is driven, and a predetermined number of lead pins 4 (five in this embodiment) and the remaining lead pins 40 (two in this embodiment) are cut off. The lead pin is cut by a lead pin cutting device 11.

In addition, 17 in FIG. 1 is a board mounting device, and this board mounting device ff 17 is a printed circuit board that inserts the printed circuit board 2 into each contact 4a of the remaining lead pins 4 forming the set, as shown in FIG. It consists of a board insertion mechanism. Since this printed circuit board insertion mechanism has a well-known configuration, detailed explanation thereof will be omitted.

Furthermore, 18 is a frame body cutting device, and this frame body cutting device 18 has a frame cutter drive circuit 24, and when a predetermined number of printed circuit boards 2 are attached to the lead frame 1, the frame body 3 is cut into a predetermined length. Cut at the right angle. The cutting length of the frame body 3 is determined by the reference board setting circuit 25. The reference board setting circuit 25 is composed of, for example, a variable voltage source, and outputs a reference board setting signal corresponding to the number of printed circuit boards 2 to the control circuit 15 in the form of a digital signal. Therefore, this reference board setting circuit 2
By adjusting the output signal from 5, the set number of reference substrates can be freely changed. A printed circuit board detection device 20 is installed in association with the frame body cutting device 18 .

As shown in FIG. 5, the printed circuit board detection device 20 includes a circuit board sensor 21 such as an optical sensor, and a circuit board counter 22 to which a detection signal from the circuit board sensor 21 is supplied.
For example, the number of printed circuit boards 2 is detected by counting pulse signals generated by the circuit board sensor 21 with a circuit board counter 22 . The output signal of this printed circuit board detection device 20 is supplied to the control circuit 15 in the same way as the lead bin detection signal.

As a result, the control circuit 15 controls the printed circuit board detection device 2.
A control signal is output to the electric motor drive stop 1 circuit 23 based on the signal from 0, and the drive of the electric motor that rotates the first transport roll 7 is stopped at a predetermined position of the frame body cutting device 18 of the frame body 3. Stop when the cutting positions match. Next, the control circuit 15 supplies a drive current to the frame cutter drive circuit 24, thereby operating the frame body cutting device 18 to cut the frame body 3 to a predetermined length.

Next, the effect will be explained.

When the lead frame 1 is inserted between the transport roll 7 and the free roll 8 which are rotated by an electric motor, the lead frame 1 is pinched from above and below by the free roll 8 and the transport roll 7 due to the biasing force of the free roll 8. ,■tsull
T! The rotational force of the feed roll 7 transports it to the right side in FIG. 1.

In this case, since the rotational axis center line R of the conveyance roll 7 is inclined at a predetermined angle α with respect to the direction C perpendicular to the conveyance direction F of the lead frame 1, the conveyance given to the lead frame 1 is The rotational force of the roll 7 acts in a direction perpendicular to the axis R of the transport roll 7, and the lead frame 1 is sent out in the perpendicular direction.

However, this is an example of the direction in which the rotating axis R of the progressive roll 7 extends, and is the feeding direction of the lead frame 1, that is, li! ! Direction C perpendicular to the axis R of feed r1 feed 1
Since the guide 10 is provided on the side where the intersection point A exists, the movement of the lead frame 1 in the delivery direction is restricted by this guide 10. As a result, the lead frame 1 sent out from the conveyance roll 7 is transferred to the guide 1.
While one side of the lead frame is in sliding contact with the lead frame 0, the lead frame is guided by this guide 10 and transported in a predetermined lead frame transport direction F.

Therefore, with the above configuration, the lead frame 1 can be reliably transported in the predetermined transport direction F by the transport roll 7 and the guide 10.

Moreover, since it has a simple structure of the first general feed roll 7 and the guide 10, and there is no need to replace the conveyance roll 7, etc.
The entire feeding device can be made inexpensive.

(Narrowing down 1: The lead frame 1 transported by the J-Luer and the free roll 8 has unnecessary lead pins 40 cut off by the lead pin cutting device II, and then the printed circuit board 2 is cut by the board spraying device 17. After that, the frame main body 3 is cut into a predetermined length by the frame main body cutting device 1B.Thereby, lead frame cut pieces of a predetermined length to which a predetermined number of printed circuit boards 2 are attached are obtained. It will be done.

In addition, in this embodiment, the free roll 8 was provided opposite the conveyance roll 7, but instead of this, a cradle was provided, and the 1
Only the general feed roll 7 may be configured to be rotatable, and
Of course, the conveyance roll 7 may be configured to be biased toward the free roll 8 side.

〔Effect of the invention〕

As explained above, in the present invention, the conveying roll is arranged so that its rotational axis axis intersects at a predetermined angle with the direction perpendicular to the conveying direction of the lead frame, and
A structure is adopted in which a guide is provided to restrict movement of the lead frame in the direction of the axis 2.

Therefore, the lead frame can be transported in a predetermined direction without using the holes provided in the lead frame! Therefore, regardless of the length of the hole pinch provided in the lead frame, the lead frame can always be transported in a predetermined direction. Moreover, it is possible to IB feed the lead frame in a predetermined direction without considering not only the length of the hole pitch but also the presence or absence of the hole pitch, and there is no need for a replaceable structure such as a conveyor roll, and there is no need for the parts thereof. Since there is no need for replacement, the number of parts can be significantly reduced, the structure of the entire device can be simplified, and an inexpensive conveying device can be provided.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram showing one embodiment of the present invention, and FIG.
The figure shows an enlarged front view of the transport roll shown in Fig. 1, and the third
4 is an explanatory diagram of a lead frame, and FIG. 5 is a block diagram showing an example of a control circuit. ]...Lead frame, 2...Printed circuit board, 3...Frame body, 4...
Lead bin, 7... Conveyance roll, 8...
・Freeroll, 10...Guide, R...
・・Rotation axis axis center line of the conveyor roll, F・・・・Conveyance direction of the lead frame, C・・・・Direction perpendicular to the conveyance direction, α・・・・Predetermined angle Patent applicant Nippon Handa Kogyo Co., Ltd. Ike 1) Representative Shigeo Patent attorney Tetsuya Mori Patent attorney Takayoshi Naito Patent attorney Masatoshi Shimizu Patent attorney Seitsu Sei 5

Claims (1)

[Claims] A conveyance roll that conveys a lead frame used for a printed circuit board by pinching it with another roll or a pedestal, and a conveyance roll provided in the direction in which the axis of rotation of this conveyance roll extends.
a guide for opening the movement of the lead frame in the axial direction of the lead frame, and the center line of the rotation axis of the conveyance roll intersects a direction perpendicular to the direction of movement of the lead frame at a predetermined angle. A transport device for lead frames for printed circuit boards.