JPH0840585A - Substrate feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] When picking up the substrates such as lead frames stacked on the stocker one by one with the pickup head and transferring them to a predetermined position, the pickup head erroneously picks up two or more substrates. An object of the present invention is to provide a substrate supply device that eliminates picking up and can reliably pick up one by one. [Structure] By blowing compressed air from a blow-out hole 15 opened in a stocker 11 to a lead frame 12 stacked on the stocker 11, the uppermost lead frame 12 is a lead frame of the second or lower lead frame. 12 is separated and floated, and in this state, it is vacuum-adsorbed by the adsorption pad 31 of the pickup head 30 and picked up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate supply apparatus for picking up and picking up a substrate such as a lead frame or a circuit substrate, which is stored in a stocker by stacking, by vacuum suction by a pickup head one by one. is there.

[0002]

2. Description of the Related Art Substrates such as lead frames and circuit boards are
Usually, they are stored in a stocker in a solid state, and are picked up one by one from this stocker by a pickup head and supplied to a product inspection line or a chip mounting line.

FIG. 4 is a partial front view of a conventional lead frame supply device. 1 is a stocker for stacking and accommodating lead frames LF, 2 is a conveying path for pitch-feeding the lead frame LF to the next step, 3 is reciprocating between the stocker 1 and the conveying path 2, and leads inside the stocker 1 The pickup head picks up the frames LF one by one and transfers them to the conveyance path 2.

When the pickup head 3 picks up the uppermost leadframe LF by vacuum suction, the leadframes LF are apt to stick to each other due to static electricity, so that two or more leadframes L are erroneously attached.
F may be picked up, and in order to prevent this, a blower 4 is arranged on the upper side of the stocker 1, and air is blown onto the lead frame LF adsorbed by the pickup head 3 from the second blower. The following lead frame LF was blown off.

[0005]

However, since the above-mentioned conventional means blows off the second and subsequent lead frames LF by wind force, it lacks certainty and, in some cases, the first lead frame LF. However, there was a problem that it was easily accidentally blown off.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a substrate supply device capable of reliably picking up the substrates, which are stacked and stored in a stocker, one by one by a pickup head.

[0007]

To this end, according to the present invention, the uppermost substrate is provided in the pickup head by lowering and raising the pickup head with respect to the substrates stacked and stored in the stocker. Is a substrate supply device that picks up vacuum by a suction pad, picks it up, and transfers it to a predetermined position.Air that blows air from the side on the topmost substrate among the substrates stacked in the stocker. The blowing means is provided.

[0008]

According to the above construction, the uppermost substrate to be picked up is preliminarily separated from the second and lower substrates by blowing air to float the uppermost substrate from the second substrate. Only the top substrate can be picked up.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a front view of a substrate supply apparatus according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the stocker, and FIG. 3 is a partial front view of the same during operation. 1 to 3, reference numeral 11 denotes a box-shaped stocker in which a large number of lead frames 12 are solidly housed and stored. As shown in FIG. 3, the lead frame 12 is solidly stacked on the lift plate 13. An elevating mechanism 14 supports the elevating plate 13, and elevates the elevating plate 13.

Air blow-out holes 15 are opened at a pitch on both sides on the long side of the upper part of the stocker 11. These blowout holes 15 are connected to an air blower 18 via pipes 16 and 17. Further, a cylinder 20 is provided on one side of the upper side of the stocker 11 on the short side. The rod 21 of the cylinder 20 enters the inside of the stocker 11 and prevents the uppermost lead frame 12 from jumping out by the air blown from the blowout hole 15. Reference numeral 22 is a bracket for mounting the cylinder 20.

In FIG. 1, a pickup head 30 has a plurality of suction pads 31. The pickup head 30 vacuum-sucks the lead frame 12 to the suction pad 31 to pick up the lead frame 12, and the stocker 1
It is transferred and mounted on the transport path 32 provided on the side of 1. The transport path 32 transports the lead frame 12 to a product inspection line, a chip mounting line, or the like.

The lead frame supply device is constructed as described above, and its operation will be described below. In FIG. 3, the pickup head 30 descends toward the lead frame 12 stacked inside the stocker 11. At this time, the compressed air is vigorously blown out from the blowout hole 15 toward the lead frame 12 near the uppermost stage, so that the plurality of leadframes 12 near the uppermost stage are separated / floated from each other in advance. Therefore, when the suction pad 31 of the pickup head 30 vacuum-sucks the uppermost lead frame 12 and then the pickup head 30 rises, the second and subsequent lead frames 12 are completely separated from the uppermost lead frame 12 in advance. Therefore, only the uppermost lead frame 12 is picked up and transferred and mounted on the transport path 32.

Before the pickup head 30 descends and picks up the lead frame 12, if the compressed air is blown out more strongly from the blow-out hole 15, the uppermost lead frame 12 will be the second or subsequent lead frame 12.
Can be separated more reliably. In this case, if the compressed air is blown out strongly, the lead frame 12 may fly out of the stocker 11 due to the flow force. Therefore, in this case, the rod 21 of the cylinder 20 is projected onto the lead frame 12 and the lead frame 1
2 is prevented from jumping out of the stocker 11. When the suction pad 31 of the pickup head 30 descends and picks up, the blowing of compressed air is weakened, and the rod 21 of the cylinder 20 is withdrawn from the inside of the stocker 11 so as not to obstruct the pickup. Of course, the cylinder 20 may be omitted.

Each time the pickup head 30 picks up the lead frame 12 in the stocker 11,
The number of lead frames 12 in the stocker 11 decreases, and the height of the lead frame 12 in the uppermost stage gradually decreases. Then, the elevating mechanism 14 is driven to gradually elevate the elevating plate 13 so that the lead frame 1 near the uppermost stage is
2 is always maintained at a height near the blowout hole 15. In the present embodiment, the case where the lead frame is supplied has been described as an example, but the present invention can be applied to the case where the circuit board is supplied.

[0015]

As described above, according to the present invention, the uppermost substrate picked up by the pickup head is
It is possible to surely separate the first and subsequent substrates from each other in advance, and to pick up only the uppermost substrate floating in the stocker, thereby eliminating the mistaken picking up of two or more substrates at the same time.

[Brief description of drawings]

FIG. 1 is a front view of a substrate supply device according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of a stocker of a substrate supply device according to an embodiment of the present invention.

FIG. 3 is a partial front view of the substrate supply apparatus according to the embodiment of the present invention during operation.

FIG. 4 is a partial front view of a conventional lead frame supply device.

[Explanation of symbols]

 11 Stocker 12 Lead frame 15 Blow-out hole 18 Air blower 30 Pick-up head 31 Adsorption pad

Claims (1)

[Claims] 1. A pickup head descends and rises with respect to substrates that are stacked and stored in a stocker to pick up the uppermost substrate by vacuum suction using a suction pad provided in the pickup head. A substrate feeding device for transferring the substrate to a predetermined position, characterized in that it is provided with an air blowing means for blowing air from the side to the substrate near the uppermost stage among the substrates stacked in the stocker. Substrate supply device.