JP2000177864A - Guard sheet feeding device and guard sheet separating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed guard sheets sheet by sheet in feeding various guard sheets by vertically vibrating at least one of two suction pads or at least one row of two rows of suction pads. SOLUTION: A motor 130 and a fixed part 150 are moved so that two suction parts 110 come into a specified position above a guard sheet group 180A, and suction pads 111 of two suction parts 110 supported to a conveying moving part 140 are positioned almost horizontally. In the stopped state of the motor 130, the fixed part 150 is moved downward to bring two suction pads 111 into close contact with an uppermost guard sheet of the guard sheet group 180A to suck it. After sucking the uppermost guard sheet, the motor 130 is driven to move two pads 111 upward into a specified position while sucking the guard sheet 180, and a vibrator 120 is vibrated. The uppermost guard sheet 180 is separated from the following guard sheet by vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interleaf paper supply device for supplying interleaf paper to be inserted between thin sheet products when stacking the thin sheet products, and a method of separating the interleaf paper.
Particularly, when a thin sheet-like product such as a lead frame and an interleaving paper are stacked alternately on a sheet-like shape in which the product portion is fixed at the connecting portion, and the interleaving paper is separated. About the method.

[0002]

2. Description of the Related Art In recent years, with the trend toward higher performance of electronic devices and lighter, thinner and smaller electronic devices, LSIs, as typified by ASICs, have been increasingly integrated and functionalized. Multi-terminal ICs, especially ASICs represented by gate arrays and standard cells, microcomputers, DS
P (Digital Signal Processo)
As a package for providing a user with high cost performance such as r), a plastic QFP (Quad Flat Package) using a lead frame has become mainstream, and has now been put to practical use up to 300 pins or more.

[0005] The QFP uses a lead frame 810 shown in FIG. 8B. As shown in FIG. 8A, a semiconductor element 820 is mounted on a die pad 811 and surface treatment such as silver plating is performed. The formed tip of the inner lead 812 and the terminal 821 of the semiconductor element 820 are connected by a wire 830, sealed with a sealing resin 840, the dam bar 814 is cut, and the outer lead 813 is formed into a gull-wing shape. It is molded into. The QFP has been developed as a structure in which outer leads 813 for electrically connecting to an external circuit are provided in four directions of a package and which can cope with the increase in the number of terminals.

The lead frame 810 used here
Is made of a metal material having a high electric conductivity and a high mechanical strength, such as a 42 alloy (42% nickel-iron alloy) or a copper alloy, by a photo-etching method or a stamping method. ). Usually, a lead frame 810 (corresponding to 810 in FIG. 8) shown in FIG. 6B in which a plurality of lead frames 810 are imposed (810A) is connected to the connecting portion 819 as shown in FIG. In a sheet shape in the fixed state (810B). The fabrication of semiconductor devices
In the state shown in FIG. 6B, plating processing for wire bonding, mounting of semiconductor elements, and resin sealing are performed.
This is done separately. In addition, as shown in FIG. 6B, a state in which a plurality of lead frames are imposed is called a continuous shape,
This one set is also referred to as one series or one frame.

In recent years, in order to cope with the miniaturization of the lead frame accompanying the increase in the density of the semiconductor element, the tip of the inner lead 812 is connected to the connecting portion 817 which is originally unnecessary, as shown in FIGS. After the outer shape is processed in a state where the inner lead portion 812 is connected, the inner lead portion 812 is formed.
Is fixed by taping (FIGS. 7A and 7B), and the tip of the inner lead for removing the unnecessary connecting portion 8117 is cut. (FIGS. 7A and 7C) As the shape of the connecting portion 817, there is also a shape of connecting to the die pad 811. Further, after this, the die pad portion 811 is subjected to downset processing as needed.
7 (b) (b) FIG. 7 (b) (a) and FIG. 7 (b) (b) are sectional views taken along lines C1-C2 in FIGS. 7 (a) and 7 (a), respectively.
(A) It is a C3-C4 section in (c).

[0006] Usually, a lead frame maker produces a continuous lead frame processed in this manner.
The interleaf is sandwiched between the layers and stacked, and the whole is wrapped in wrapping paper before being shipped to a semiconductor device maker. Generally, the stacking form of the continuous lead frame is shown in FIG.
As shown in (1), the product portion of the lead frame is not stained or scratched, and the upper and lower ends have elasticity. The slip sheet 520 used is such that the lead frame 500 is not stained or scratched.
As for 30, an elastic resin or cardboard sheet is used. In some cases, one that takes into account the packaging process is used. If necessary, undercoat layer 510, interleaf paper 520, upper layer 5
Each of the layers 30 may have a plurality of layers. When the lead frame 500 has been subjected to down-set processing, the undercoat layer 510, the slip sheet 520, and the upper layer 530 have respective shapes in consideration of the down-set processing.

Further, after the outer shape is processed by etching or the like in the state shown in FIG. 6A or the state shown in FIG. 6B, interleaving paper is temporarily provided between products during various processes. , May be laminated.

As described above, when laminating thin products such as lead frames, interleaving paper is generally provided between the products. Then, as a method of supplying the interleaf, the uppermost interleaf of the stacked interleaf paper group is vacuum-adsorbed from the upper side by a suction pad and lifted upward, and the interleaf is conveyed in a state of being adsorbed. The method of supplying was adopted. However, in this conventional method, two sheets or more of slip sheets may be supplied at a time for the following reasons, which should be supplied one sheet at a time. Two or more slip sheets stick together due to static electricity. The vacuum force reaches the second and subsequent sheets through the very small holes in the slip sheet, and the two or more sheets are stuck together. Due to burrs generated during the production of slip sheets, two or more sheets of slip sheets are stuck together. To cope with this, the suction sheet at the top of the slip sheet group is vacuum-adsorbed from above with suction pads. Figure 3
As shown in (1), the first method of dropping the interleaf paper other than the uppermost one by separating both sides of the sucked interleaf with a separating plate provided above the interleaf paper box, A second method (not shown) for preventing the suction of two or more sheets by performing air blow on the upper part of the stacked interleaf sheets before suctioning the sheets to form a gap between the interleaf sheets. Alternatively, as shown in FIG. 4, a third method is provided in which two or more suction pads are provided, the slip sheet is sucked, and then the pads are brought close to each other to bend the slip sheet and prevent two or more sheets from being sucked. There is.

The first method and the third method will be briefly described below. The first method shown in FIG.
The suction pad 311 of No. 0 is brought into contact with the uppermost slip sheet of the slip sheet group 380A to be sucked (FIG. 3A). In this state, the suction section 310 is moved upward, and the end of the slip sheet is moved. Judgment board 3
50 (FIG. 3 (b)), by applying an impact to the adsorbed interleaf, unnecessary interleaf is removed, and the interleaf is separated from the interleaf group 380A one by one (FIG. 3 (b)). c)). In the third method shown in FIG. 4, the suction pad 411 of the suction unit 410 is brought into contact with the uppermost slip sheet of the slip sheet group 480A and sucked (FIG. 4A).
The gap between the uppermost interleaving paper and the lower interleaving paper 460 was generated by narrowing the interval of 410B (FIG. 4).
(B)) Thereafter, the suction portions 410A, 410 are kept at this interval.
B is moved upward, and the interleaf papers are
A is separated from A (FIG. 4C). FIG.
After the state (c), the interval between the suction units 410A and 410B is returned to the original. (FIG. 4 (d))

However, the effects of the first method and the second method are insufficient, and it is impossible to completely prevent two or more slip sheets from sticking to each other. The third method is effective for interleaving paper having no stiffness, but cannot be applied to interleaving paper having stiffness such as resin or cardboard.

[0011]

For this reason, when stacking thin sheet products, a slip sheet feeding device for feeding a slip sheet inserted between the thin sheet products is used. There has been a need for a slip sheet supply device that can feed slip sheets one by one. The present invention corresponds to this, and is intended to provide an interleaf paper supply device for supplying interleaf paper used by being inserted between the lamellar products when stacking the lamellar products. It is an object of the present invention to provide a slip sheet supply device capable of feeding slip sheets one by one. At the same time, an object of the present invention is to provide a method for separating slip sheets that can supply slip sheets one by one.

[0012]

SUMMARY OF THE INVENTION An interleaf paper feeder according to the present invention is an interleaf paper feeder for supplying interleaving paper to be inserted between thin sheet products when stacking the thin sheet products,
The uppermost interleaf sheet of the stacked interleaf paper group is sucked from the upper side by the suction pad and lifted upward, the interleaf is transported in a state of being sucked and supplied, and the suction pad is inserted into the interleaf paper. Two or two rows are arranged side by side in the longitudinal direction, and these are integrally moved vertically and moved to a predetermined position, and at least one of the two suction pads or two rows are provided. Vibration means for vibrating at least one row of the suction pads in a vertical direction is provided. Further, the vibration means moves the support portion for supporting the suction pad up and down by a vibrator. Alternatively, the vibration means is characterized in that a bellows is provided directly on the suction pad, or a bellows is provided on a support portion supporting the suction pad.

According to the method for separating slip sheets of the present invention, when stacking thin sheet products, in order to supply slip sheets to be inserted between the thin sheet products, the uppermost sheet of the stacked slip sheet group is supplied. A method of separating slip sheets, in which only the uppermost slip sheet is lifted upward and separated by suctioning a sheet of paper from above with a suction pad, and when lifting the slip sheet, two pieces of paper are arranged in the longitudinal direction of the slip sheet. Or two rows of suction pads are arranged at the same level, and each suction pad is placed on the uppermost slip sheet of the stacked slip sheet group from above, sucked, sucked, and then the two suction pads are sucked. Alternatively, the two rows of suction pads are moved upward while sucking the slip sheet, and the slip sheet is lifted.
At least one of the suction pads or at least one of the two rows of suction pads is vibrated vertically or horizontally.

[0014]

According to the slip sheet feeding method of the present invention, a slip sheet feeding apparatus for feeding a slip sheet inserted between thin sheet products when stacking the thin sheet products by adopting such a configuration. Thus, it is possible to provide a slip sheet supply device capable of feeding slip sheets one by one even in the supply of various slip sheets. Specifically, the uppermost interleaf of the stacked interleaf paper group is sucked from the upper side by the suction pad and lifted upward, the interleaf is transported in a state of being sucked, and supplied. Two or two rows of pads are provided in a line in the longitudinal direction of the slip sheet, and these are integrally moved for vertical movement and position movement to a predetermined position, and at least one of the two suction pads is provided. This is achieved by providing a vibrating means for vibrating at least one of the two rows of suction pads in the vertical direction.

Further, according to the interleaf separation method of the present invention, by adopting such a configuration, interleaf paper can be supplied one by one for various interleaf papers when stacking thin sheet products. It is possible to provide a paper separation method.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of an embodiment of a slip sheet supply device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing only a main configuration of a slip sheet supply device of a first example of the embodiment, and FIG. 2 is a schematic diagram of a main configuration of a slip sheet supply device of a second example of the embodiment. FIG. 1 and 2, 11
0 is a suction unit, 111 is a suction pad, 112 is a fixed unit, 1
20 is a vibrator, 130 is a motor, 131 is a rotary screw part of the motor, 132 is a fixed part, 140 is a moving part for conveyance, 141 and 142 are bearing parts, 151 and 152 are slide shafts, 153 is a bearing part, 155 and 156. Is a slide guide, 160 is a screw portion, 165 is a fixed and slide shaft,
Reference numerals 171 and 172 denote bearing portions, 180 denotes interleaf paper, 180A denotes interleaf paper group, 190 denotes interleaf paper mounting box, 210, 21
0A is a suction unit, 211 and 211A are suction pads, 212
Is a fixing part, and 220 is a bellows. In FIG. 1, a thick arrow indicates movement in the direction of the arrow, and a dotted arrow indicates a direction of vibration. Further, a part of the transfer moving unit 140 is partially shown in perspective so that the inside can be seen.

First, a first example of an embodiment of a slip sheet supply device of the present invention will be described. In this example, when stacking a thin product (corresponding to 810A in FIG. 6B) composed of a lead frame processed into a continuous shape as shown in FIG. 6B, it is used by being inserted between the thin products. As shown in FIG. 1, a stacking sheet group 180
The uppermost interleaf of A is sucked from the upper side by the suction unit 110 and lifted upward, and the interleaf 180 is transported in a state of being sucked, and is transported to the stacking unit (not shown) of the thin product. Supply.

In the slip sheet supply device of the present embodiment, two suction pads are provided side by side in the longitudinal direction of the slip sheet, and the two fixing pads 150 are moved up and down along the slide shafts 151 and 152 so as to form two suction pads. The suction pad 111 can be moved up and down as a unit, and the motor 130 fixed to the fixing part 150 drives the screw part 160 to rotate, so that the suction pad 111 is conveyed along the screw part 160 and the fixed and slide shaft 165. By moving the movement unit 140, the position can be moved to a predetermined position.

The fixed portion 150 includes a slide guide 155,
156, slide shafts 151, 1
52 is driven and moved by a vertical moving unit (such as a motor drive (not shown)).

The vertical position of the interleaf placement box 190 can be adjusted by the amount of interleaf.

The vibrator element of the bi-ipulator 120 includes one using an electrostrictive vibrator or a magnetostrictive vibrator, but is not limited to one using these elements.

Next, a slip sheet group 180 of the apparatus shown in FIG.
The operation of separating the slip sheets 180 one by one from A will be described.
This is an explanation of an example of the embodiment of the slip sheet separating method of the present invention. First, the two suction units 110
The motors 130 and 120 are moved so as to be located at a predetermined position on the slip sheet group 180A, and the fixed unit 150 is moved, and the two suction units 110 supported by the transfer unit 140 are moved. After the suction pads 111 are positioned substantially horizontally, the fixing parts 150 are lowered downward with the motors 130 and 120 stopped, and the two suction pads 1
11 is brought into close contact with the uppermost interleaf paper of the interleaf paper group 180A, and each is adsorbed. After the suction, the motor 120 is driven to
The slip sheet 180 is moved upward by a predetermined distance while being sucked by the suction pads 111, and the vibrator 120 is vibrated. Due to the vibration, the uppermost interleaving paper 180 is separated from the lower interleaving paper. The reason why the interleaf paper 180 is separated one by one by the vibration of the vibrator 120 is that the operation in which a minute gap is generated between the interleaf papers 180 due to the vibration and the air enters there is repeated. Next, the fixing portion 150 is moved upward (by a moving portion not shown) along the slide guides 155 and 156, and the two suction portions 110 are integrally moved in the upward direction. Move 180 upward. Thereby, only the uppermost slip sheet 180 can be separated. In addition, the fixing unit 150 is moved, and the suction pad 111 is moved.
Is the desired height. Further, the motor 130 is driven to the predetermined position to be conveyed, and the two suction pads 111 are moved together with the transfer unit 140 while the interleaving paper 180 is being sucked.

Next, a second example of the embodiment of the slip sheet supply device of the present invention will be described. In this example, as in the first example, FIG.
When stacking thin products (corresponding to 810A in FIG. 6 (b)) formed of a lead frame processed into a continuous shape as shown in FIG. 6 (b), interleaving paper to be inserted and used between the thin products is supplied. As shown in FIG. 2, the uppermost interleaf of the stacked interleaf paper group 180A is suctioned from above by suction units 210 and 210A and lifted upward by the interleaf supply device. And supplies it to a loading section (not shown) of the sheet-like product.

As in the first example, in this example, two suction pads (the suction pads 21) are arranged in the longitudinal direction of the slip sheet.
1, 211A) is provided, and by moving the fixing portion 150 up and down along the slide shafts 151 and 152, the two suction pads 211 can be vertically moved integrally.

The transport mode is basically the same as that of the first embodiment shown in FIG.
The suction units 210 and 210A are different from those of the first example. In the case of this example, the two suction units 210 and 210A are fixed to the transfer unit 140 via the fixing unit 112.
The bellows 220 is attached to the suction pad 21 on one of the suction portions 210A.
It is provided integrally with 1A. That is, the suction pad 211A itself has a bellows structure, and depending on the weight of the slip sheet 180,
Vibrates with the movement of the suction unit. This suction pad 21
A gap is generated between the uppermost slip sheet and the lower slip sheet by the vibration of 1A, and the operation of putting the atmosphere is repeated to separate them. Thus, the description of the separating operation will be replaced.

As a modification of the first example and the second example, the object is a wide thin plate-shaped product as shown in FIG.
The suction pads may be provided in two rows arranged in the longitudinal direction of the slip sheet. Further, as a modified example of the second example, a bellows is provided in the middle of the support portion 112 that supports the suction pad 110A without providing the bellows directly on the suction pad. Also, as in the first and second examples, the vibration effect in the vertical direction has a separating effect, but the effect can be obtained by vibrating one of the two suction portions in the horizontal direction. Alternatively, there is an example in which vertical vibration and horizontal vibration are performed together.

[0027]

As described above, the present invention relates to a slip sheet feeding apparatus for feeding a slip sheet inserted between thin sheet products when stacking the thin sheet products. This also makes it possible to provide a slip sheet supply device capable of feeding slip sheets one by one. At the same time, it has become possible to provide a method for separating slip sheets that can supply slip sheets one by one.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main configuration of a first example of an embodiment of a slip sheet supply device of the present invention.

FIG. 2 is a schematic diagram showing a main configuration of a second example of the embodiment of the slip sheet supply device of the present invention.

FIG. 3 is a schematic diagram for explaining the operation of a suction unit of a conventional slip sheet supply device.

FIG. 4 is a schematic diagram for explaining the operation of a suction unit of a conventional slip sheet supply device.

FIG. 5 is a view for explaining a laminated form of a lead frame;

FIG. 6 is a view for explaining the external processing state of the lead frame.

FIG. 7 is a diagram for explaining processing of a lead frame;

FIG. 8 is a diagram of a semiconductor device and a lead frame.

[Explanation of symbols]

110 suction part 111 suction pad 112 fixing part 115 screw part 120 vibrator 130 motor 131 motor rotation screw part 132 fixing part 140 transport moving part 141, 142 bearing part 150 fixing part 151, 152 slide shaft 153 bearing part 155, 156 slide Guide 160 Screw part 165 Fixed / slide shaft 171, 172 Bearing part 180 Insert paper 180A Insert paper group 190 Insert paper placement box 210, 210A Suction unit 211, 211A Suction pad 212 Fixing unit 220 Bellows 310, 310A, 310B, 410, 410A, 41
0B Suction unit 311, 411 Suction pad 312, 412 Fixing unit 350 Separation plate 380, 480 Slip sheet 380 A, 480 A Slip sheet group 390, 490 Slip sheet placement box 500 Lead frame 510 Sublayer 520 Slip sheet 530 Upper layer 810 Lead frame 810A Thin sheet product (in a sheet state) 810B Continuous lead frame (1 frame) 811 Die pad 812 Inner lead 813 Outer lead 814 Dam bar 815 Frame (frame) section 817 Connection section 819 Connection section 820 Semiconductor element 821 Terminal (Pad) 830 Wire 840 Sealing resin 860 Tape

Claims (4)

[Claims] 1. An interleaf paper supply device for supplying an interleaf used by being inserted between thin sheet products when stacking the thin sheet products, comprising: The suction pad is suctioned from the upper side and lifted upward, the slip sheet is transported in a sucked state and supplied, and two or two rows of suction pads are provided in the longitudinal direction of the slip sheet,
These are vertically moved and moved to a predetermined position as a unit, and at least one of the two suction pads or at least one of the two rows of suction pads is vibrated in the vertical direction. An interleaf paper supply device, comprising: a vibrating means for causing a vibration. 2. The interleaf paper feeding device according to claim 1, wherein the vibrator moves the support portion for supporting the suction pad up and down by a vibrator. 3. The interleaving paper supply device according to claim 1, wherein the vibrating means has a bellows provided directly on the suction pad or a bellows provided on a supporting portion for supporting the suction pad. 4. In order to supply interleaving paper to be inserted between thin laminar products when laminating laminar products, the uppermost interleaving paper of the stacked interleaving paper group is sucked from above by a suction pad. A method for separating slip sheets, in which only the uppermost slip sheet is lifted upward and separated by suction, and when lifting the slip sheet, two or two rows of suction pads are arranged in the longitudinal direction of the slip sheet. With the height being the same level, each suction pad is placed on the uppermost slip sheet of the stacked slip sheet group from above and sucked. After suction, the two suction pads or the two rows of suction pads are removed. The interleaving paper is moved upward while being sucked, and the interleaving paper is lifted. At least one of the two suction pads or at least one of the two rows of the suction pads is vibrated vertically or horizontally. Of slip paper, Separation method.