JPH07137886A - Thin plate supplier - Google Patents

Abstract

PURPOSE:To accurately detect supply of a single sheet of thin plate of lead frame or the like. CONSTITUTION:In a lead frame (thin plate) supplier in which a lead frame 11 stored in a lead frame stocker 13 is transfer loaded on lead frame conveying rails 12 by a pickup device 15, to detect whether the lead frame 11 on the lead frame conveying rails 12 is a single sheet or not by lead frame sensors 16, the lead frame sensor 16 is arranged so that its detecting line 29 is tilted against a thickness direction of the lead frame 11 loaded on the lead frame conveying rails 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device,
In particular, the present invention relates to a thin plate supply device suitable as a lead frame supply device for supplying a lead frame to which semiconductor pellets are bonded.

[0002]

2. Description of the Related Art In a lead frame feeding device for transferring a lead frame as a thin plate onto a lead frame carrying rail of a pellet bonding machine, as shown in FIG. Lead frame sensor 2 is installed, and lead frame 1
It is detected whether or not a single sheet has been supplied on the lead frame transport rail.

The lead frame sensor 2 is arranged so that the detection line 3 is parallel to the thickness direction t of the lead frame 1 mounted on the lead frame transport rail. Therefore, the shielding amount (detection width M) of the detection line 3 in the lead frame sensor 2 is determined by the actual thickness of the lead frame 1.

[0004]

Generally, since the lead frame 1 is very thin, the difference in thickness between one and two is very small. Therefore, in the lead frame sensor 2, if the detection line 3 is shielded only by the actual thickness of the lead frame 1, it is determined whether there is one lead frame 1 or two or more lead frames 1 on the lead frame transport rail. Difficult to do.

For example, when the lead frame 1 is twisted or distorted and the shielding amount (detection width M) of the detection line 3 by the lead frame 1 is changed, the lead frame feeding device moves the lead frame 2 onto the lead frame conveying rail. There is a risk of erroneously detecting that one or more lead frames 1 are stacked and supplied.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a thin plate feeding device capable of detecting whether or not a predetermined number of thin plates such as lead frames have been accurately fed. And

[0007]

SUMMARY OF THE INVENTION According to the present invention, a thin plate stored in a stocker is transferred to a transfer unit by a pickup device, and a sensor detects whether or not the number of the thin plates on the transfer unit is a set number. In the thin plate supply device for detecting, the sensor is arranged such that the detection line thereof is inclined with respect to the thickness direction of the thin plate placed on the transport section.

[0008]

Therefore, according to the thin plate supply apparatus of the present invention, the detection line of the sensor is arranged so as to be inclined with respect to the thickness direction of the thin plate placed on the conveying section, so that the thin plate shields the detection line. The amount of shielding (detection width of the sensor) can be made larger than that when the detection line of the sensor is parallel to the thickness direction of the thin plate. As a result, even if the thin plate is thin and the thin plate is twisted or distorted, the number of thin plates on the transport section is not erroneously detected. It is possible to detect whether or not it has been done.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a lead frame supply device to which an embodiment of a thin plate supply device according to the present invention is applied. FIG. 2 is an enlarged view of a part of the lead frame supply device of FIG. 1, where (A) is a partial perspective view and (B) is a partial side view.

As shown in FIG. 1, a lead frame supply device 10 as a thin plate supply device transfers a lead frame 11 as a thin plate onto a lead frame transfer rail 12 as a transfer part of a pellet bonding device. , A lead frame stocker 13, an elevating device 14, a pickup device 15, and a lead frame sensor 16.

The lead frame stocker 13 is arranged adjacent to the lead frame transport rail 12 and stores a plurality of (for example, 200 to 600) lead frames 11 in a stacked state. At this time, the intermediate paper 17 is interposed between the lead frames 11 housed in the lead frame stocker 13.

The elevating device 14 includes an elevating screw shaft 19 rotatably supported by a supporting frame 18, and a motor 21 arranged on the supporting frame 18 and imparting a rotational force to the elevating screw shaft 19 via a belt 20. And an elevating block 22 which is screwed to the elevating screw shaft 19 and elevates by the rotation of the elevating screw shaft 19. An elevating arm 23 that forms the bottom of the lead frame stocker 13 is integrally formed on the elevating block 22, and the elevating arm 23 supports the lead frame 11 in the lead frame stocker 13. The elevating device 14 raises the uppermost lead frame 11 in the lead frame stocker 13 to the pickup level and sets it at this position.

The pickup device 15 is attached to a drive mechanism 24 and is provided so as to be movable in horizontal and vertical directions, and a lead frame sucker vertically provided on the outer peripheral edge side of the lower surface of the pickup arm 25. 26 and an intermediate paper suction cup 27 vertically provided on the lower surface of the pickup arm 25 on the center side.

The pick-up device 15 is a lift device 1.
The uppermost leadframe 11 in the leadframe stocker 13 set to the pickup level by 4 is adsorbed by the leadframe suction cup 26, and the intermediate paper 17 placed on the uppermost leadframe 11 is placed in the middle. It is sucked by the paper suction cup 27. And the pickup device 15
Moves the pick-up arm 25 horizontally to transfer the lead frame 11 sucked by the lead frame suction cup 26 onto the lead frame transport rail 12, and then moves the intermediate paper 17 sucked by the intermediate paper suction cup 27. The intermediate paper storage box 28 is discarded.

Now, the lead frame sensor 16 is
The pickup device 15 detects whether or not the number of the lead frames 11 transferred onto the lead frame transport rail 12 is a single. This lead frame sensor 16
Is a light emitting / receiving photo sensor, for example, and a pair of lead frame sensors 16 are arranged to face each of the two lead frame transport rails 12.

Each of these lead frame sensors 16 is
As shown in FIG. 2, the detection line 29 is arranged so as to be inclined with respect to the thickness direction T of the lead frame 11 placed on the lead frame transport rail 12. Therefore, in the lead frame sensor 16, the detection amount by which the detection line 29 is shielded by the lead frame 11 (the detection width W of the lead frame sensor 16) is the same as that of the conventional example (FIG. 3). It can be set larger than in the case of being arranged in parallel with the thickness direction t. As a result, even if one thin lead frame 11 is twisted or distorted, it is erroneously detected that a plurality of lead frames 11 on the lead frame transport rail 12, for example, two lead frames 11 are stacked. This can be prevented, and the supply of a single lead frame 11 can be accurately detected.

The detection line 29 of the lead frame sensor 16 has a larger inclination angle with respect to the thickness direction T of the lead frame 11 on the lead frame transport rail 12 and the detection accuracy of the lead frame sensor 16 is improved. .

In the above embodiment, the lead frame supplying device 10 for supplying the lead frame 11 as a thin plate onto the lead frame conveying rail 12 has been described. However, a form supplying and conveying device in which the thin plate is a form or the like is used. As described above, the present invention can be applied to another thin plate supply device that supplies and conveys a single thin plate or a set number of two or more thin plates.

[0019]

As described above, according to the thin plate feeding device of the present invention, the set number of thin plates such as lead frames are
It is possible to detect whether or not the supply is accurate.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lead frame supply device to which an embodiment of a thin plate supply device according to the present invention is applied.

2 is an enlarged view of a part of the lead frame supply device of FIG. 1, where (A) is a partial perspective view and (B) is a partial side view.

FIG. 3 shows a lead frame sensor of a conventional lead frame supply device, (A) is a perspective view thereof,
(B) is the side view.

[Explanation of symbols]

 10 Lead Frame Supply Device 11 Lead Frame 12 Lead Frame Conveying Rail 13 Lead Frame Stocker 15 Pickup Device 16 Lead Frame Sensor 29 Lead Frame Sensor Detection Line T Lead Frame Thickness Direction W Lead Frame Sensor Detection Width

Claims (1)

[Claims] 1. A thin plate supply device in which a thin plate accommodated in a stocker is transferred to a transfer unit by a pickup device and a sensor detects whether or not the number of the thin plates on the transfer unit is a set number. The thin plate feeding device, wherein the sensor is arranged so that its detection line is inclined with respect to the thickness direction of the thin plate placed on the transport section.