JPH08108226A - Press die with intermittent hole detector - Google Patents

Abstract

PURPOSE: To surely detect the pitch shifting or skipped punching of intermittent holes by arranging a detector at the exit of a die. CONSTITUTION: An intermittent hole 5 punched with a prescribed pitch by a press die equipped with a punch for making intermittent holes is brought under a position, where a photoelectric switch 3 by optical fiber is arranged, after several shots. An intermittent hole detector is provided immediately after the exit 1a of the press die. The belt length of a lead frame blank is accurately controlled which is fed for a stroke of the press die 1 in press working; hence, if the detector is provided immediately after the exit 1a of the press die 1, no positional deviation occurs on the blank belt 2, and errors for detecting the intermittent holes 5 or malfunctions are reduced, surely detecting the presence or absence of the intermittent holes and pitch shifting. It is especially desirable to use the photoelectric switch 3 of optical fiber as a detecting sensor for the intermittent hole detector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for press working a lead frame having intermittent holes.

[0002]

2. Description of the Related Art A hoop-shaped lead frame in which unit lead frames are continuously arranged is provided with an intermittent hole 5 as shown in FIG. 2 at a predetermined position for each unit lead frame of several pieces. And is called a lead frame having an intermittent hole.

The intermittent hole 5 provided in the lead frame having the intermittent hole is formed when the inner lead pattern is pressed on a long strip of lead frame material, for example.
A punch punch operated by solenoid control is provided in the die, and the inner lead pattern is operated once every several shots of the press to push out the punch to form an intermittent hole at a predetermined position.

Whether or not the intermittent holes are formed at predetermined positions at a predetermined pitch can be inspected by visual inspection during the conventional press working, or by applying a gauge or the like after the lead frame is commercialized. Inspecting including pitch.

[0005]

In the case of manufacturing a lead frame having an intermittent hole, when an abnormality occurs in a die, a material or a product, the line is stopped, the abnormality is repaired and the line is restarted. The pitch of the intermittent holes may shift.

[0006] In addition, when the holes are operated by solenoid control, the pitch of the intermittent holes may be deviated due to a malfunction of control or the like. In this case, since the commercialized hoop-shaped lead frame is continuously wound up, even if there is a gap or jump in the pitch of the intermittent holes generated during continuous manufacturing, it is difficult to completely detect them by visual inspection. is there.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a detecting means capable of surely detecting a gap or a hole jump in the pitch of the intermittent holes which may occur during continuous manufacturing.

[0008]

The above-mentioned objects can be achieved by the press die with the intermittent hole detector of the present invention.

That is, (1) In a die for press working for manufacturing a lead frame having an intermittent hole, an intermittent hole detector is provided at an outlet of the die, and a press die with an intermittent hole detector is provided. Type.

Alternatively, more preferably, (2) the intermittent hole detector is achieved by the press die with the intermittent hole detector described in (1), characterized in that the optical fiber photoelectric switch is used as a detection sensor. It

The intermittent hole detector used in the present invention may be a mechanical one, a detector using a fluid such as air, or a detection system in which light passing through the intermittent hole is received by an image sensor. It is preferable to use a photoelectric switch as a detection sensor. The essence of the present invention is that the intermittent hole detector is attached to the outlet of a press mold for providing an intermittent hole, and the mold is a press mold with a detector,
The purpose is to detect intermittent holes more quickly and more reliably.

The intermittent hole detector of the present invention attached to the press die is used for detecting the intermittent holes provided in the lead frame material strip, and also the cutting provided in the lead frame material strip shown in FIG. It can also be used for detecting the notch 6.

[0013]

EXAMPLE An example of the present invention will be described with reference to FIG. However, the description is for deepening the understanding of the present invention and does not limit the present invention.

FIG. 1 is a side view for explaining a press die with an intermittent hole detector according to the present invention.

In FIG. 1, 1 is a pressing die, 2 is a lead frame material band, 3 is an optical fiber photoelectric switch, 4 is a jig for mounting the optical fiber photoelectric switch, and 5 is an intermittent hole.

The optical fiber photoelectric switch used in the present invention emits light, and detects the presence or absence of a hole depending on whether the light hits the object to be detected and is reflected back, or passes through the object to be detected. Further, in the optical fiber photoelectric switch of the present invention, a condenser lens is attached to the tip of the optical fiber so that the spot at the detection position becomes 0.4φ, and it is possible to detect a smaller hole.

In a normal pressing die, a material to be processed is punched out at the bottom dead center of a punch of a press machine, and the material is fed near the top dead center. Therefore, the intermittent holes punched at a predetermined pitch with the press die 1 having the intermittent hole punching punches are located below the position where the optical fiber photoelectric switch is arranged after several shots.

In the present invention, the intermittent hole detector is provided immediately after the outlet 1a of the pressing die as shown in FIG. This is provided immediately after the outlet 1a of the press die, because the length of the lead frame material band sent during one stroke of the press die 1 in the press work is controlled very accurately. Therefore, the misalignment of the material band does not occur, and the detection error or malfunction of the intermittent hole can be reduced, and the presence or absence of the intermittent hole and the pitch deviation can be reliably detected.

[0019]

By operating the intermittent hole detector of the present invention having a press die attached thereto during the pressing work of the lead frame, the pitch deviation and the hole skipping of the intermittent holes generated during the continuous pressing work can be surely performed. Can be detected. Specifically 10
During the continuous press work for 00 hours, the pitch deviation of the intermittent holes and the hole skipping could be detected with 100% accuracy.

Further, the number of times the worker or the inspector inspects the pitch deviation of the intermittent holes and the hole jump during the continuous press work or the inspection can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic side view of a press die with an intermittent hole detector of the present invention.

FIG. 2 is a schematic front view of a lead frame having an intermittent hole.

FIG. 3 is a schematic front view of a lead frame having a notch.

[Explanation of symbols]

 1 Press mold 2 Lead frame material band 3 Optical fiber photoelectric switch 4 Photoelectric switch mounting jig 5 Intermittent hole 6 Notch

Claims (2)

[Claims] 1. A press die for manufacturing a lead frame having an intermittent hole, wherein an intermittent hole detector is provided at an outlet of the die, and a press die with an intermittent hole detector is provided. 2. The press die with an intermittent hole detector according to claim 1, wherein the intermittent hole detector uses an optical fiber photoelectric switch as a detection sensor.