JPH0757442B2 - Lead wire cutting device - Google Patents

Description

The present invention relates to a device for automatically cutting a lead wire attached to an electronic component such as an integrated circuit device.

[Prior Art] In the manufacture of semiconductor integrated circuit devices such as hybrid ICs, so-called lead frames, which have continuous lead pins in a frame shape, are widely used, and are mounted on an integrated circuit substrate by, for example, soldering. Fix and connect.
At this time, there is a part of the lead wire which is unnecessary in the soldered lead frame between the boards or in the same board.

Conventionally, in order to remove such an unnecessary lead wire, it is manually cut by using a nipper or the like, or a die in which a cutter is arranged at a predetermined interval is made, and the unnecessary lead is cut by a pressing process. The way is done.

However, in the former lead cutting method,
(1) Quality is not constant, (2) Cutting mistakes easily occur,
(3) There are problems such as high cost. Even when the latter mold is used, (4) it is necessary to prepare a mold according to the cutting position of the lead pin due to the change of the type of IC to be manufactured. (5) For repairing the mold There were problems such as cost and time.

[Problems to be Solved by the Invention] Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and an object thereof is automatic with a constant quality, no cutting error, and low cost. An object of the present invention is to provide a lead wire cutting device for an operable integrated circuit device.

Further, according to the embodiment of the present invention, it is possible to provide a lead wire cutting device for an integrated circuit device which can easily cope with a change in IC type and a change in lead pitch or unnecessary lead pin position. Become.

[Means for Solving the Problem] An object of the present invention is to provide a lead cutter having an upper blade and a lower blade, a cutter driving means for driving at least one of the upper blade and the lower blade of the lead cutter, and an integrated circuit. A lead frame carrying means for loading the lead frame into which the device is connected and whose part of the lead pins is to be cut, and a lead frame which is provided in or near the lead cutter and which is carried in. A lead pin detecting means for detecting a lead pin, and a control device for inputting a detection signal from the lead pin detecting means and generating a drive control signal for driving the cutter driving means for cutting a predetermined lead pin of the lead frame are provided. And a lead wire cutting device for an integrated circuit device.

Further, according to an embodiment of the present invention, the control device has a storage means for storing information for specifying a lead pin of a lead frame to be cut, and further inputs storage information of the storage means. An external input device for

[Operation] According to the present invention, the lead pin detecting device detects the position and the number of the lead pin of the lead frame carried into the lead cutter by the lead frame conveying means, while the control device is Since a predetermined lead pin is cut by the detection signal from the lead pin detecting device, a drive control signal is generated to drive the cutter driving means to cut the lead wire. For this reason, it is possible to obtain a lead wire cutting device for an integrated circuit device which has a constant quality, is free from cutting mistakes, and can be operated at a low cost.

Further, according to the embodiment of the present invention, the stored contents of the storage means can be easily changed by the external input device, and thus the change of the lead pitch and the unnecessary lead pin position accompanying the product type change can be easily dealt with. It will be possible.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of a lead wire cutting device according to the present invention. That is, in the figure, a solenoid supporting member 2 is erected on a base 1 and a substantially square solenoid supporting plate 3 is attached near the center thereof. A linear solenoid 4 is mounted on the upper surface of the solenoid support plate 3.

A plunger 5 is provided at the center of the linear solenoid 4, and a substantially + -shaped plunger support means 6 is attached to the upper end thereof. That is, as is clear from the figure, in the vicinity of the upper end of the solenoid support member 2,
Further, a substantially square support plate 7 is fixedly installed, and four springs 8, 8 ... (However, in the figure, 3
(Only books are shown) are attached, and their tips are connected to the tips of the + -shaped solenoid supporting hands 6.

This linear solenoid 4 moves up and down by electromagnetic force. That is, the solenoid 5 is energized by the action of a control device (not shown) to move the plunger 5 downward in the figure, and the springs 8, 8 ... Move up.

A substantially rectangular plate-shaped guide plate 9 that moves up and down by the action of the solenoid 4 is attached to the lower end of the plunger 5, and moves vertically with the plunger 5.
A cutter attachment portion 10 is formed at the lower end portion of the guide plate 9, and an upper blade 11 of the lead cutter is fixedly attached to the center portion thereof.

On the other hand, below the guide portion 9, a lead cutter supporting member 12 is also provided upright from above the base 1, and a lower blade 13 of the lead cutter is fixed to the upper end portion thereof. Further, in the figure, reference numeral 14 indicates an optical fiber which constitutes an optical lead detection device which will be described in detail later, and is positioned with its opening facing downward near the attachment position of the upper blade 11 of the lead cutter. ing. Reference numeral 15 indicates an optical fiber mounted in the lower blade 13 of the lead cutter.

A so-called rack and pinion device 16 is provided on the base 1 apart from the solenoid supporting member 2. A motor 17 is integrally attached to the rack-and-pinion device 16 as a drive device for the rack-and-pinion device 16, and the rod 18 of the rack-and-pinion device is reciprocated by its driving force. A chuck 19 made up of two substantially rectangular plates is attached to the tip of the rod 18, and a plurality of IC boards 20, 20 ... Are attached to the tips of the lead pins 21, as shown in the drawing. It holds the lead frame 22.

Further, in FIG. 1, a so-called keyboard as an external input device, which will be described later in detail, is indicated by reference numeral 23.

FIG. 2 shows the configuration of the lead wire cutting device shown in FIG. 1 and its control circuit. That is, the optical fibers 14 and 15 are connected to the lead pin sensor 100. The sensor 100 includes a light emitting section including a light emitting diode or the like, a light receiving section including a photodiode or a phototransistor, a driving section for driving the light emitting section, and further for amplifying signals of the light receiving section And an amplifying section. Then, the output signal of the sensor 100 is sent to the counter 110.

The sensor 100 is described as a light transmission type in the above embodiments, but is not limited thereto.
Other than that, for example, a light reflection type, a proximity switch type, a contact type detection system, or a conveyance system encoder, pulse disc, or other detection system may be used. is there.

The counter 110 counts the output signal from the sensor 100, and the count value is counted by the controller 12
Output to 0. This controller 120 has more memory
130 is connected. And this controller 120
Outputs the control signal to the linear solenoid 4 and the motor 17 of the rack and pinion 16 to control the operations thereof. Further, the above-mentioned keyboard 23 is connected to the memory 130 as an external input device.

The operation of the lead wire cutting device described above will be described below in the second section.
Description will be made with reference to FIGS. This Figure 3
It is the figure which saw the cutter part of FIG. 1 from the top. Further, in the figure, among the lead pins 21 of the lead frame 22, the leftmost to sixth lead pins are connected to the IC substrate, and the following seventh and eighth lead pins are so-called unnecessary lead pins.

When operating this lead wire cutting device, first, the IC substrate 20,
The lead frame 22 to which 20 ... Is attached is sandwiched between the two plates of the chuck 19. On the other hand, the keyboard 23 is used to input the lead pitch of the lead frame 22 and the lead pin number to be cut into the memory 130. In the following description, for example, the lead pitch is 1.8 and the seventh and eighth
The second lead pin is entered as the lead pin number to be cut.

Next, the motor 17 is controlled by the control signal from the controller 120.
Is operated to move the rod 18 of the rack and pinion 16 to the left as indicated by the arrow in the figure. With this movement, each lead pin 21 of the lead frame 22 sequentially passes between the upper blade 11 and the lower blade 13 of the lead cutter. At the same time, the lead pin interrupts the optical path constituted by the optical fibers 14 and 15, so that the lead pin sensor 100 detects the lead pin of the lead frame 22 and after shaping and amplifying the signal waveform, sends the output signal to the counter 110. It The counter 110 counts the output of the sensor 100, that is, the number of passages of the lead pin 21, and the counted value is counted by the controller 120.
Have been sent to.

The controller 120 compares the count value from the counter 110 with the stored contents in the memory 130, and when these match, the timing when the lead pin to be further cut comes between the upper blade 11 and the lower blade 13 of the cutter. In response to this, a control signal for driving the linear solenoid 4 is output. That is, in the above embodiment, the control signal is output when the count value of the counter 110 reaches "7" and "8". Further, the timing when the lead pin comes between the upper blade and the lower blade of the cutter is determined by the lead pitch of the lead frame, the transport speed, and the like.

The linear solenoid 4 is driven by the control signal from the controller 120 and moves the plunger 5 downward. By the movement of the plunger 5, the guide plate 9 connected therebelow also moves downward, and the upper blade 11 of the lead cutter fixed to the cutter attachment portion 10 at the lower end thereof also moves downward at the same time. Then, the lowering of the upper blade 11 of the lead cutter cuts the lead pin 21 of the lead frame 22 placed between the lower blade 13 and the lower blade 13.

In the above-described embodiment, even if the lead frame to be cut is changed, it is possible to easily deal with it by simply inputting the lead pitch of the lead frame and the lead pin number to be cut into the memory using the keyboard 23. In addition to the ones described above, this memory also uses, for example, a bar code, punch card, or magnetic card for input, a method that uses an external memory such as a floppy disk, and several types of necessary data in the memory. It is also possible to adopt a method of inputting and calling and using as necessary.

Further, the width of the upper blade of the lead cutter may be wide enough to cut one lead pin. However, if the width of the upper blade is small, the pin is left uncut, and if it is too large, the adjacent pin is also cut. On the other hand, the lead frame is standardized and there are various lead pitches, but the lead pin width is constant. Therefore, generally, the width of the upper blade of the cutter is set to a blade width X that satisfies the following formula with respect to the smallest lead pitch, so that it can be shared by various lead frames.

B <X <2P−B where P is the lead pitch and B is the width (constant) of the lead pin.

[Effects of the Invention] As is apparent from the above description, according to the present invention, it is possible to provide a lead wire cutting device which has a constant quality, is free from cutting mistakes, and can be automatically operated at low cost. Becomes

Further, according to the above-described embodiment, it is possible to provide a very practical lead wire cutting device that can easily cope with the change of product type.

[Brief description of drawings]

FIG. 1 is an overall view of an apparatus showing an outline of the configuration of a lead wire cutting device according to the present invention, FIG. 2 is a block diagram showing an electric circuit portion of FIG. 1, and FIG. It is a top view for explaining operation of a cutter. 4 ... Linear solenoid, 5 ... Plunger, 9 ... Guide plate, 11 ... Cutter upper blade, 13 ... Cutter lower blade, 14, 15
...... Optical fiber, 16 ...... Rack and pinion, 18
...... Rod, 19 …… Chuck, 20 …… IC board, 21 …… Lead pin, 22 …… Lead frame, 23 …… Keyboard,
100 …… Lead pin sensor, 110 …… Counter, 120 ……
Controller, 130 ... Memory

Claims (4)

[Claims] 1. A lead cutter having an upper blade and a lower blade, a cutter driving means for driving at least one of the upper blade and the lower blade of the lead cutter, and an integrated circuit device connected to a part thereof. Lead frame conveying means for carrying in a lead frame whose lead pins are to be cut into the lead cutter; lead pin detecting means provided in or near the lead cutter for detecting lead pins of the carried lead frame; and the lead pin. A lead wire cutting device, comprising: a control device that receives a detection signal from a detection means and cuts a predetermined lead pin of the lead frame to generate a drive control signal for driving the cutter driving means. . 2. The control device according to claim 1, further comprising storage means for storing information for specifying a lead pin of a lead frame to be cut, and further storage information of the storage means. An external input device for inputting a lead wire cutting device. 3. The control device according to claim 2, further comprising a counter, wherein the counter counts a detection signal from the lead pin detecting means and coincides with a lead pin number stored in the storing means. The lead wire cutting device, wherein the drive control signal is output when the lead wire cutting device is operated. 4. The lead wire cutting device according to claim 1, wherein the lead pin detecting means includes a light emitting element, a light receiving element, and an optical fiber.