JPS6218043Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a discharging mechanism, specifically a mechanism for pushing out and discharging articles in semiconductor integrated circuit (IC) assembly, testing equipment, etc.

(2) Technical background Resin-encapsulated semiconductor integrated circuits (plastic
For example, an automatic cutting and shaping device, which is one of the equipment for assembling ICs, sequentially performs five operations on mold-filled lead frames: resin cutting, tie bar cutting, pinch cutting, lead cutting, and lead bending. This is a device that automatically performs the final shaping process. Among these steps, steps up to are performed using a cutting mold, and steps are performed using a bending mold.

After completing the steps from to, the plastic IC is extruded from the cutting die and discharged to the bending die.

The mechanism for ejecting the plastic IC described above is shown in a plan view in FIG. 1a and a front view in FIG. Movable slider, 3 is air cylinder, 4
5 indicates the shaft, and 5 indicates the bearing. In the illustrated device, the slider 2 guides the shaft 4 and slides left and right by the air cylinder 3. Also,
Since the pusher 1 is screwed onto the slider 2, it works together with the slider 2 to remove the plastic.
Push out IC6. The plastic IC 6 is sent from the cutting mold as shown by the arrow, and is to be discharged toward the bending mold as shown by the arrow.
The lower half of the tip of the pusher 1 is cut out and is structured to engage with a mold of a plastic IC.

(3) Conventional technology and problems Plastic ICs may not be ejected due to mold defects (for example, mold cracks due to insufficient filling or ejection failure), or plastic ICs may be cracked in the cutting mold and remain in the mold. In this case, it is clear that if the cutting die is used for further work, the cutting die will be damaged.

Nevertheless, no improvements have been made to the conventional device shown in FIG. 1, and the above-mentioned problem of accident occurrence has not been solved.

(4) Purpose of the invention In view of the above-mentioned conventional problems, the present invention has been developed to improve
The purpose is to provide an ejection mechanism that protects ICs from damage and also protects equipment for assembly, testing, etc. from damage.

(5) Structure of the invention According to the invention, in a discharge mechanism using a pusher arm capable of reciprocating motion, the pusher arm is provided with load limiting means, and the load limiting means is provided in a notch formed in the pusher arm. A sphere is placed, the sphere is pressed and held by a push screw via a spring,
If the plastic IC is not pushed out with the set load, the pusher arm will fall off backwards and
This is accomplished by providing a mechanism in which a sensor plate provided on the pusher arm is sensed by a photo sensor located along the path of the pusher arm and stops the movement of the pusher arm, ie, the IC ejection mechanism.

(6) Examples of the invention Hereinafter, examples of the invention will be described in detail with reference to the drawings.

An embodiment of the invention is shown in a front view in Figure 2a and in a side view in Figure 2b, in which:
1 is a pusher arm, 12 is a pusher base (corresponding to the conventional slider), 13 is a steel ball, 14 is a spring, 15 is a set screw, 16 is a photo sensor, and 17 is a sensor plate. The pusher arm 11, like the pusher shown in FIG. 1, pushes out and discharges, for example, a plastic IC at its tip, and also,
The pusher base 12 moves in a manner similar to the slider of the device of FIG.

A V-shaped notch 18 is formed approximately in the center of the thick part of the pusher arm 11.
A steel ball 13 is disposed within the spring 14.
The push screw 15 is attached to the pusher base 12, and the pusher base 12 is configured to be capable of reciprocating movement similarly to the mechanism shown in FIG. 1, as described above. Therefore, the tip of the pusher arm 11 ejects the plastic IC. steel ball 1
3 remains in the notch 18, the pusher arm 11 engages with the pusher base 12 and moves together as one unit. That is, as long as the push screw 15 holds the steel ball 13 in the notch 18, the pusher arm 11 moves integrally with the pusher base 12 since the push screw 15 is attached to the pusher base 12, but the pusher arm 11 moves as shown in the figure. When unable to move (forward) to the right, the pusher base 12 continues to move forward despite this, the steel ball 13 comes out of the notch 18, and the pusher base 12 and pusher arm 11 are disengaged and become integral. It will no longer be. Thus, notch 1
8, the steel ball 13, the spring 14, and the push screw 15 constitute one load limiting means, and within a predetermined load range, the pusher arm 11 moves toward the pusher base 1.
When a predetermined load is exceeded, only the pusher base 12 moves forward, leaving the pusher arm 11 behind.

As described above, when the pusher arm 11 is no longer integrated with the pusher base 12, the pusher arm later falls off, and the sensor plate 17, which is integrated with the pusher arm, is attached to the photo sensor 16 disposed along the path of the pusher arm.
block the optical path. At that time, in the normal configuration, an alarm signal will be issued to stop not only the illustrated ejection mechanism but also the cutting and shaping device described above, so that all related equipment will be stopped and necessary inspection and maintenance can be carried out. It becomes possible to implement it.

The load limiting means can be preadjusted in accordance with the articles to be discharged, so that the articles discharged by the pusher arm are plastic.
The invention is not limited to ICs, and the scope of application of the mechanism shown in FIG. 2 is not limited to the example described above. Although a steel ball was selected as the material to be placed in the notch, it may be any ball and is not particularly limited to being made of steel.

(7) Effects of the invention As explained in detail above, when the discharge mechanism of the present invention is used, if the article cannot be discharged for some reason, an alarm is reliably issued and all related devices are stopped. Therefore, damage to articles and equipment will be avoided.

[Brief explanation of the drawing]

1A and 1B are a plan view and a front view of a conventional ejection mechanism, and FIGS. 2A and 2B are a plan view and a left side view of the ejection mechanism according to the present invention. 11... Pusher arm, 12... Pusher base, 13... Steel ball, 14... Spring, 15...
...Push screw, 16...Photo sensor, 17...
Sensor plate, 18...notch.

Claims (1)

[Scope of utility model registration request] In a mechanism for discharging articles sent from another device using a pushing member, a notch is formed in the pushing member, and a sphere pressed by a push screw via a spring is disposed in the notch. , the push screw is attached to a reciprocating member, a sensor plate is integrally attached to the extrusion member, and when a load exceeding a predetermined load is applied to the extrusion member, the sphere is removed from the notch, A discharge mechanism characterized in that the pushing member is configured to fall off after being disengaged from the reciprocating member.