JPH07309438A - Lead frame accumulating device - Google Patents

Abstract

PURPOSE:To provide a device by which continuously carried lead frames can be layered on each other at a high speed. CONSTITUTION:A lead frame accumulating device is provided with a conveyor 1 to carry in a lead frame 7, a pair of positioning gate shafts 2 having grooves to downward drop the lead frame after passing an angle by locking the edge part of the lead frame by receiving it from the shaft end in a certain turning angle position, an inter-shaft distance adjusting part 3 to slidably hold a pivoting part to horizontally pivot the mutual positioning gate shafts and a driving part 4 to respectively inward and intermittently rotate the mutual positioning gate shafts by a constant angle apiece by synchronizing them with each other, and is provided with a stock conveyor 5 where plural belts 34 are arranged at intervals under the mutual positioning gate shafts and a lead frame delivering part 6 to raise and lower a lead frame layering stand 40 formed between the mutual belts to below the belts from below the mutual positioning gate shafts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for accumulating a plurality of lead frames in a stacked state.

[0002]

2. Description of the Related Art As a conventional device for stacking a plurality of lead frames in a stacked state and accumulating them, a rotary plate for receiving and mounting the lead frames is continuously provided at a loading destination of a carry-in conveyor. There is one in which the tip is tilted downward and is pivotally supported. In this stacking device, first, the lead frame fed by the carry-in conveyor is slid and fed to the tip of the rotating plate. At this time, by abutting the tip of the lead frame against a guide plate or the like, the tip is always aligned at a fixed position. In this state, the lead frame is transferred onto the conveyor by rotating the rotating plate by about 90 ° so that it rises up with the air cylinder, and the lead frame is erected in a horizontally long state via the feed plate erected on the conveyor. There is one that accumulates until it reaches a predetermined number.

[0003]

However, this conventional device has an advantage that it is not necessary to change the setup even if the lead frame has various sizes. After the frame has been transferred onto the conveyor, it has to rotate backward to return to its original position, so that the frame is driven by a cylinder, and its movement also becomes large, so that there is a problem that the speed cannot be increased for stacking.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to:
An object of the present invention is to provide a device capable of stacking lead frames that are continuously conveyed in a stacked state at high speed.

[0005]

As means for achieving the above object, in the lead frame stacking apparatus of the present invention, a conveyer for loading the lead frame; and a lead frame from a shaft end at a constant rotation angle position. A pair of positioning gate shafts that receive and lock the edge of the lead frame and drop the lead frame downward after passing through the predetermined rotation angle position; and a pair of positioning gate shafts; An inter-axis distance adjusting unit that slidably holds a horizontally supported shaft support unit; a drive unit that synchronizes the positioning gate shafts with each other and intermittently rotates them inward at fixed angles; A stock conveyor in which a plurality of belts are arranged below each other at intervals; and a lead frame stacking platform formed so as to be vertically movable between the belts is moved up and down. And configured to include a; the from below the locating gates axes and transfer of the lead frame for lifting up under the belt in stage.

[0006]

In the present invention, first, the carry-in conveyor supplies the lead frame to the positioning gate shaft. The positioning gate shaft positions the lead frame above the stacking position by receiving the lead frame in the groove. After that, the drive unit rotates the positioning gate shaft so that the groove is in the downward direction, and the lead frame is dropped from the groove, whereby the lead frames can be stacked at a certain position.

When the size of the lead frame is changed, the stacking position of the lead frames can be changed without breaking by simply adjusting the distance between the positioning gate shafts.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing the lead frame stacking device of this embodiment, which is vertically separated, FIG. 2 is an explanatory view showing an inter-axis distance adjusting unit and a driving unit, and FIG. 3 is a positioning gate shaft and delivery. It is explanatory drawing which shows the operating state with a part. First, the configuration of the embodiment will be described.

Lead frame integrated device A of this embodiment
Is mainly composed of a carry-in conveyor 1, a positioning gate shaft 2, an axial distance adjusting unit 3, a driving unit 4, a stock conveyor 5, and a delivering unit 6.

The carry-in conveyor 1 includes a lead frame 7
Are supplied to the positioning gate shaft 2 arranged next at a speed one by one, and have a belt 11 for holding both edges of the lead frame horizontally and a speed control type conveyor motor 12. is doing.

The positioning gate shaft 2 positions the lead frame 7 at a fixed position (laminating position) and supplies it by dropping, and a groove 13 for locking the edge portion of the lead frame 7.
However, one end side thereof is provided with the shaft end cut out and the other end side is provided with the shaft end not cut in parallel with the shaft center. A pair of the positioning gate shafts 2 are horizontally provided and are pivotally supported by the U-shaped frames 14 and 15, respectively.
As shown in FIG. 3, the cross-sectional shape of the groove 13 is, as shown in FIG. 3, a mounting surface 16 of the lead frame which is aligned in the radial direction from the axial center, and a flank 17 which is slightly opened from the mounting surface 16 by more than 90 degrees. And formed every 180 degrees. Further, the mounting surface 16 of the groove 13 is formed in a wavy shape so that the lead frame that receives it slides well.

The inter-axis distance adjusting section 3 adjusts the spacing between the positioning gate shafts 2 to have different width dimensions depending on the type of the lead frame, and a pair of guide rails 19 are provided on the upper horizontal frame 18. The U-shaped frames 14 and 15 are fixed in parallel with each other so that the U-shaped frames 14 and 15 are arranged so as to be orthogonal to the guide rail 19 via a sliding body 20 so that the distance between them can be adjusted. And these U-shaped frames 14 and 15
Of the U-shaped frames, one end has a right-hand thread and the other U-shaped frame has a left-hand thread on both ends.
Is provided.

Reference numerals 23 and 23 in the figure denote a pair of screw shafts provided with reverse screws from the central portion to the left and right, and each has a U-shaped frame 1
The positioning gate shafts 2 are arranged on both sides of the screws 4 and 15 and are screwed into the female screw portions 21 and 22, respectively, and the positioning gate shafts 2 are made to approach each other by rotation in one direction, and are separated by rotation in the other direction. Reference numeral 24 is a timing belt that rotates the screw shafts 23, 23 arranged on the left and right in synchronization with each other. The pulley 2 is provided at the tip of the screw shaft.
It is interlocked via 5. Reference numeral 26 is an adjustment knob for rotating the screw shaft 23. Further, 27 is a sensor for detecting the lead frame on the positioning gate shaft, 28 is a stopper, which is provided on one end side of the positioning gate shaft 2 so that lead frames of various sizes are always aligned with the center of the stacking position. The mounting position is adjustable.

The drive unit 4 is provided with the positioning gate shaft 2
The stepping motor 29 and the ball spline shaft 30 are connected to each other and are intermittently rotated by a predetermined angle inwardly in synchronization with each other.
It extends so as to be orthogonal to one end side of the other, and is rotatably supported in that state. The ball spline shaft 30 has a pair of screw gears 3 whose teeth are in opposite directions.
1 is mounted via a ball unit 32 so as to be slidable in the axial direction.

Further, a pair of screw gears 33 having tooth traces in opposite directions are fixed to one end side of the positioning gate shaft 2, and by holding the screw gears 33 in mesh with the screw gears 31, respectively, a step motor is provided. The rotation of 29 is transmitted to the pair of positioning gate shafts 2, and each of them is formed so as to rotate inward. Then, the positioning gate shaft 2 is stopped by controlling the step motor 29 so that the mounting surface 16 always faces upward.

The stock conveyor 5 is for stocking laminated lead frames received from a delivery section 6 which will be described later, and a plurality of conveyor belts 34 are provided below the positioning gate shaft 2 with gaps 35 respectively. Is stretched over. In the figure, 36 is an intermittent drive motor for the conveyor belt 34, 37 is a pitch detecting slit plate, 38 is a slit detecting sensor, and 39 is an end position presence / absence detecting sensor for the stocked lead frame.

The delivery unit 6 stacks a predetermined number of lead frames from which the positioning gate shaft 2 has fallen, and then,
A gap 35 which is to be delivered to the stock conveyor 5 and which is provided between the belts of the stock conveyor 5.
And a plurality of stacking stands 40 arranged for each
From below the positioning gate shaft 2 to the conveyor belt 3
4, a guide portion 41 slidably held below, and a speed control type transfer motor 4 for driving the guide portion 41.
2 and. In the figure, 43 is a sensor for detecting the upper limit deceleration position when the stacking table 40 is raised by a detection plate 44 provided in the guide section 41, 45 is its upper limit detection sensor, 4
Reference numeral 6 is a stacking abnormality detection sensor, and 47 is a lower limit detection sensor.

In the figure, reference numeral 48 is a sub-stock table, which moves the sub-table 50 forward and backward below the positioning gate shaft 2 by means of a solenoid 49 to temporarily stock the lead frame that falls during the transportation of the stock conveyor. . Reference numeral 51 is a frame upper surface detection sensor.

Next, the operation will be described. First, the lead frame 7 is sent one by one to the positioning gate shaft 2 side by the carrying conveyor 1 at a speed. On the positioning gate shaft 2 side, the lead frame 7 slides on the mounting surface 16 and hits the stop bar 28 to stop. At this time, the lead frame 7 is in a state in which both edges thereof are held by the mounting surfaces 16 of the positioning gate shaft 2. And the sensor 27
Outputs the detection signal of the lead frame 7 and drives the step motor 29.

By the quick drive of the step motor 29,
The positioning gate shafts 2 rotate inward, respectively, and the mounting surface 1
6, the lead frame 7 is released downward and the lead frame 7 is released, and at the same time, the lead frame 7 floating for a moment is hit and dropped. Then, the positioning gate shaft 2 makes a half rotation to make the next mounting surface 16 horizontal and receive the next lead frame.

The dropped lead frames 7 are successively dropped and stacked on the stacking stand 40 of the delivery section 6. When the frame upper surface detection sensor 51 detects the upper surface of the lead frame, the delivery motor 42 descends at a low speed and operates to keep the stacking position constant. When the lead frame detection signal of the sensor 27 counts a predetermined number of stacked layers, the delivery motor 42 lowers the stacking table 40. When the sensor 47 of the detection plate 44 arrives, the laminated lead frame is delivered onto the stock conveyor 5, and the intermittent drive motor 36 is driven by the lower limit detection signal of the laminated lead frame. The intermittent drive motor 36 moves the conveyor belt 34 by one pitch by the slit detection sensor 38.

The delivery motor 42 lowers the stacking stand 40 below the conveyor belt 33 so that the delivery of the stacked lead frames is not hindered, and the sensor 47 is used.
It is stopped by the detection plate detection signal of, and the stock conveyor feeds one pitch, and then the high speed ascent is performed. Then, the plate 43 is decelerated by the detection plate detection signal of the sensor 43, and the stacking platform 40 is stopped at the lead frame receiving position by the detection plate detection signal of the sensor 45. The lead frame that falls during this time is stacked on the substock table 48 and stacked on the stacking stand 4
When 0 can be received, it is opened left and right and dropped.

When the shape and size of the lead frame is changed, the setup is changed. In this case, by turning the adjustment knob 26, the U-shaped frames 14 and 1 screwed into the screw shaft 21.
5 is moved toward or away from each other to adjust the width direction of the lead frame. At this time, the screw gear 31 slides on the ball spline shaft 30 by the ball unit 32 and holds the transmission of the driving force. Further, the mounting position of the stopper 28 is changed so that the width direction is adjusted with the center as a reference and the longitudinal direction is adjusted with the inlet side as a reference.

As described above, in the lead frame stacking apparatus A of this embodiment, a predetermined number of lead frames can be stacked and continuously stacked. Even if the lead frame has different shapes and dimensions, the stacking position can be made constant, and stable integration can always be achieved. Since the lead frames are stacked in the supplied state and in the direction in which they naturally fall without changing the posture such as inversion, the speed of the stacking operation can be increased. The positioning gate shaft 2 that positions the lead frame 7 at the stacking position and drops it in order makes it easy to synchronize since it only needs to rotate in a fixed direction, and the processing speed is increased by using a drive source with a high motor constant speed. Can be raised. The setup change by changing the shape and size of the lead frame can be done simply by rotating the adjustment knob 26 to the left and right, and the work is easy.

The embodiment of the present invention has been described above.
The specific configuration of the present invention is not limited to this embodiment, and the present invention includes a design change and the like within a range not departing from the gist of the invention.

For example, in the embodiment, the positioning gate shaft 2
Although the groove 13 is provided every 180 degrees, the number of grooves can be set arbitrarily without being limited to this.

Although the transfer section 6 is stacked and then lowered to be transferred to the stock conveyor 5, it may be transferred while being lowered while stacking the lead frames.

[0028]

As described above, in the lead frame collecting apparatus of the present invention, since the lead frame is constructed as described above, the lead frames can be continuously stacked in a laminated state. Even if the lead frame has different shapes and dimensions, the stacking position can be made constant, and stable integration can always be achieved. Moreover, the adjustment can be easily performed. When the lead frames are integrated, there is no unnecessary movement, and the integration work can be speeded up. Since the positioning gate shaft performs positioning and integration only by rotating in a fixed direction, synchronization can be easily achieved, and the processing speed can be increased by using a drive source with a high motor speed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a lead frame stacking device of an embodiment of the present invention, which is vertically separated.

FIG. 2 is an explanatory diagram showing an axial distance adjusting unit and a driving unit.

FIG. 3 is an explanatory diagram showing an operating state of a positioning gate shaft and a delivery unit.

[Explanation of symbols]

 A Lead frame stacking device 1 Carry-in conveyor 2 Positioning gate shaft 3 Inter-axis distance adjustment unit 4 Drive unit 5 Stock conveyor 6 Transfer unit 7 Lead frame 13 Lead frame locking groove 14, 15 V-shaped frame 19 Guide rail for sliding the positioning gate shaft 29 Step motor (driving unit for the positioning gate shaft) 34 Conveyor belt 40 Laminating stand

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // H01L 21/50 D

Claims (1)

[Claims] 1. A conveyor for loading a lead frame;
A groove is provided parallel to the shaft center to receive the lead frame from the shaft end at a fixed rotation angle position to lock the edge of the lead frame and to drop the lead frame downward after passing the fixed rotation angle position. A pair of positioning gate shafts; an inter-axis distance adjusting unit that slidably holds a shaft supporting unit that horizontally supports the positioning gate shafts; and a predetermined inward angle by synchronizing the positioning gate shafts with each other A drive unit for intermittently rotating; a stock conveyor in which a plurality of belts are arranged below the positioning gate shafts at intervals; a lead frame stacking unit that is vertically movable between the belts; A lead frame delivery part for moving up and down from below the positioning gate shafts to below the belt. Location.