JPH01287932A - Lead frame feeding chute - Google Patents

Abstract

PURPOSE:To prevent the rising up of a lead frame by a method wherein the lead frame, transferred to the first feeding chute, is held between the lower surface of a sucking head and a pressing member. CONSTITUTION:An attaching plate 20 of a roller 19, which is contacted from the lower side to a lead frame 3 placed on the first feeding chute 18A, is attached to the first chute 18A in a freely rotatable manner using a shaft 21. A spring 22 is the spring which is used to energize the roller 19 upward. To be more precise, by providing a pressing member 19, which is rotatably supported to the first feeding chute 18A with the shaft 21 as a supporting point, and the spring 22 with which the pressing member 19 is always energized in upward direction, the lead frame 3 placed on the first feeding chute 18A is supported by the lower surface of an attracting head 2 and the pressing member 19. As a result, the rising up of the lead frame on a guide rail can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is a method of suctioning and holding lead frames loaded and stored in a stocker one by one using a suction head and transferring them to the first feeding shoe). The present invention relates to a lead frame feed chute that conveys the lead frame after the process has been carried out from the top of the first feed chute to the top of the second feed chute.

(b) The conventional technology disclosed in Japanese Utility Model Application No. 57-191044 discloses that when the lead frame is suctioned and held by a suction nozzle and transferred onto the first guide rail, this suction state is maintained.
Eliminates floating of the lead frame and prevents the lead from getting caught at the entrance of the second guide rail when being transported to the next second guide rail, bending, or damaging the feed claw. Techniques are disclosed that allow frames to be transported.

However, due to the strength of the vacuum pressure, the lead frame could get caught, and the use of vacuum pressure made the device bulky.

(c) Problem to be solved by the invention It is to help the lead frame float up on the guide rail without using a vacuum ratio.

(d) Means for solving the problem The lead frames loaded and stored in the stocker are suctioned and held one by one by a suction head and transferred onto the first feed chute. In the lead frame feed chute that conveys the lead frame from above the feed chute to above the second feed chute, a pressing member rotatably supported by the first feeding chute with a support shaft as a fulcrum, and the pressing member is constantly supported. The lead frame is provided with a spring that biases the upper side, and the transferred lead frame is held between the lower surface of the suction head and the pressing member.

e) A pressing member rotatably supported on the first feed chute with the action support shaft as a fulcrum, and a spring that constantly biases the pressing member upward, thereby allowing the pressure on the first feed chute to be reduced. The lead frame transferred thereto is held between the lower surface of the suction head and the pressing member.

(F) Embodiment An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 10.

(1> is a lead frame transfer device according to an embodiment of the present invention.

<2) is a suction head that suctions and takes out lead frames (3) loaded and stored in a stocker (not shown) one by one.
It is connected to suction head moving means (5) for vertical movement.

Hereinafter, the adsorption pad (2) will be explained based on FIGS. 2 and 3.

(6A) (6B) Beam -1° Flare l, (3) Multiple rows (two rows here) of suction holes (7A).
..., (7B)... and vacuum Bose (8A>(8B)
It is a communication path that connects the

(9A) and (9B) are reference bins that serve as a reference for suctioning and holding the lead frame (3).

Next, (10) is a lead frame detection device that detects whether or not the lead frame (3) is suctioned by the suction head (2), and whether an appropriate number of lead frames (3) are suctioned. This will be explained based on the diagram.

(IIA)<11B) are a first detection lever and a second detection lever that are rotatably supported via a detection roller (12) as a contact and a fulcrum shaft (13), and The detection lever (IIA) is made of a lead frame with a thickness of 11 (
3), the second detection lever (IIB) has a thickness 7! that is slightly thicker than the lead frame (3). It corresponds to the t2 lead frame. A notch (14A) C14B) is provided at the tip of the lever (IIA) (11B).

(15A) and (15B) are first and second sensors for detecting the movement of the second detection levers (IIA) and (IIB), respectively, and are installed somewhat offset from each other.

FIG. 1 (16) shows the saucer portion of the lead frame (3).

<17) is a lead frame feeding mechanism that conveys the lead frame on the first feeding chute (18A) to the second feeding shoe 1- (18B), and will be explained below based on FIGS. 1 and 6. .

(19) is a roller that contacts the lead frame (3) installed on the first feeding unit (18A) from below;
The mounting plate (20) of the roller (19) is rotatably mounted on the first chute (18A) by a shaft (21).

(22) is a spring that allows the roller (19) to slide upward.

(23) connects the lead frame (3) to the first chute (1
8A) to the second chute (18B), and is vertically and horizontally moved by a drive mechanism (not shown).

The operation will be explained in detail below based on the drawings.

The suction head (2) suctions the lead frames (3) loaded and stored in the stocker one by one. At this time, as shown in Figures 7 and 8, a wide lead frame (3A) is used.
When adsorbing, use a switching valve (not shown) as a switching device.
When vacuum hose (8B) is opened to adsorb a narrow lead frame (3B), the vacuum hose (8B) is opened by switching the switching valve.
A) Open the adsorption state. Also, when adsorbing the wide lead frame (3A), the vacuum hose (8A) (8
B> Both may be open.

Then, while being adsorbed and conveyed onto the first feed chute (tgA), it passes above the detection roller (12).

First, if the JI head (2) is correctly suctioning one lead frame (3) with a thickness [l, the first detection lever (II) corresponding to the lead frame (3) with a thickness tl is
A) is rotated counterclockwise around the fulcrum shaft (13) from the state shown in Fig. 9 (1) to the state shown in Fig. 9 (2), and the first sensor (15A) is rotated in the notch of the lever (IIA). Part (1
4A), detecting that the proper number of sheets have been picked up, the suction head (2) transports the lead frame (3) to the first feed chute (18A>, and descends. Place it on the stocker again and continue suction conveyance.

Further, if the lead frame (2) is conveyed to the suction without suctioning the lead frame (3), the detection lever (II)
A') is not displaced, the sensor (15A) remains in a light-shielded state, and the lead frame detection device t (10) detects an abnormality and moves the lead frame to the adsorption position (2).
After proceeding to the lead frame receiving tray part (16), it returns to the stocker, picks up the lead frame (3), and repeats the conveyance.

Furthermore, the suction head (2) is attached to a plurality of lead frames (3).
When the detection lever (IIA) moves from the state shown in Figure 9 (1) to the state shown in Figure 9 (3), the fulcrum shaft (1
3) Rotate counterclockwise around the alignment sensor (15A).
) is shielded from light, thereby causing the lead frame detection device t
(10) is detected as abnormal, and the suction head (2) continues to suction the plurality of lead frames (3).
16), where the suction is stopped and the plurality of lead frames (3) are dropped into the receiving tray (16).

Then, the suction head (2) moves to the stocker again, suctions the next lead frame (3), and repeats the conveyance.

Next, when transporting a lead frame with a different thickness from the previous lead frame (3) (in this case, a lead frame with a thickness of t2, which is thicker by a), only the second sensor (15B) is used. do.

Then, the sensor (15B) detects that the second detection lever (IIB) has moved from the state shown in Fig. 10 (1) to the state shown in Fig. 10 (4), and the sensor (15B) has changed from the light-blocking state to the light-transmitting state. Then, it is detected that one lead frame having a thickness of t2 is correctly attracted to the suction board (2).

In addition, if the suction 1 head (2) is transported without suctioning the thick t2 lead frame, the detection lever (
IIB) is not displaced, the sensor <15B) remains shielded from light, and the lead frame detection device (
10) detects an abnormality, and the suction head (2) advances to the lead frame receiving tray part (16), returns to the stocker, absorbs the lead frame, and repeats the conveyance.

Furthermore, when the two lead frames are pulled apart, the lever (IIB) changes from the state shown in Fig. 1θ (1) to the state shown in Fig. 10 (6).
In this state, the sensor (15B) is shielded from light and an abnormality is detected.

Of course, during the detection, the other unused lever also rotates as the shaft (13) rotates, but the sensor corresponding to that lever is not activated.

In this way, the appropriate number of lead frames (
3) is transported as it is to the first feed shoe h (18A)
placed on top. At this time, the first feed〉knee) (18
In A), the roller (19) is urged upward by the spring (22), so the adsorption/adsorption 2) and roller (19)
) will sandwich the lead frame (3). In this state, the feed claw (24) is lowered, enters the gap between the frame (not shown) of the lead frame (3) and the island, and moves horizontally to the second feed claw (18B).
)・＼Feed, rise again.

Through this series of operations, the lead frame (3) is
Translated from "Reyute" 2.

Further, another embodiment of the lead frame detection device will be described in detail with reference to FIGS. 11 and 12.

In other embodiments, to explain how to detect the presence or absence of lead frames or whether or not there is an appropriate number of lead frames with respect to lead frames of different thicknesses, first, a controller (not shown) is configured to detect first and second lead frames. 2 sensor <35A>(
35B), the detection data consisting of each combination of light passing and light blocking states is determined. That is, both the sensors (35A)
(35B) are both shielded from light as shown in FIG. 11 (2) and FIG.
3) and the first sensor (
35A) is shielded from light and the second sensor (35B) is able to pass light, the appropriate number of lead frames that are 4 thicker than the lead frame (3) have been suctioned, as shown in Figure 11 (4).
and the first sensor (35
If A) passes through ξ and the second sensor (35B) completely blocks light, it is determined that a proper number of 2 cL thick lead frames have been suctioned, and if it is otherwise, it is determined to be abnormal, based on the data content.

Thereby, lead frames can be detected in the various cases described above.

(g) Effects of the invention Since the lead frame transferred onto the first feed chute is held between the lower surface of the suction head and the pressing member, the lead frame does not float up, and the lead frame is transferred to the next second feed chute. It is now possible to transport the lead frame without getting caught or bent at the entrance of the second feed chute during transport, or without damaging the feed pawl.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a lead frame transfer device according to an embodiment of the present invention, Figs. 2 and 3 are a plan view and a side sectional view of a suction head, and Figs. 4 and 5 are a diagram showing a lead frame detection device. Front view and side view, FIG. 6 is a side view showing the lead frame feeding mechanism, FIGS. 7 and 8 are views showing the suction head sucking lead frames of different sizes, and FIG. 9 and FIG. 10 are diagrams showing the movement of the detection lever of an embodiment of the lead frame detection device, and FIGS.
The figures similarly show diagrams showing the movement of the detection lever in other embodiments. (2)... Suction head, (3)... Lead frame, (6A) (6B)... Communication path, (8A) (8B>.
...Vacuum hose, (10)...Lead frame detection device, (IIA) (31A), (11B > (31B)
)...first and second detection levers, (12)...detection roller, (13)...fulcrum shaft, (14A) (34
A > (14B) (34B)...notch, (15
A)<35A), (15B)(35B)...
First and second sensors, (16)... saucer part, (17
)...Lead frame feeding mechanism, (18A) (18
B)...first and second feed chutes, (19)...
Roller, <22)...Spring, <24)...Feed claw.

Claims (1)

[Claims] (1) The lead frames loaded and stored in the stocker are suctioned and held one by one by the suction head and transferred onto the first feed chute, and then the lead frames are transferred from the top of the first feed chute to the second feed chute. In the lead frame feed chute for conveying the lead frame to the top, a pressing member rotatably supported by the first feed chute using a support shaft as a fulcrum;
A lead frame feeding chute comprising: a spring that always urges the pressing member upward; and a transferred lead frame is held between the lower surface of the suction head and the pressing member.