JPH06156655A - Magazine conveyor mechanism - Google Patents

Abstract

PURPOSE:To prevent the electrification of a metal magazine by providing a magazine conveyor device with a magazine grounding means. CONSTITUTION:When a magazine 18 reaches the upper part of a grounding means 20, a bearing 23 receives the weight of the magazine, and a rotating piece 21 is rotated counterclockwise against the resilience of a spring 24. As a result, the bearing 23 comes in elastic contact with the bottom face of the magazine 18 by the resilience of the spring 24 while the magazine passes on the bearing 23. The magazine 18 is thereby grounded being electrically connected to a roller supporting body through the grounding means 20 so as to be prevented from the generation of electrostatic destruction inside a semiconductor device mounted to a lead frame in the magazine 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magazine transport mechanism, and more particularly to a magazine transport mechanism for a wire bonding apparatus that transports a semiconductor device-mounted lead frame storage magazine.

[0002]

2. Description of the Related Art Generally, a plurality of (for example, 20) transfer (loading and unloading) of a wire bonding semiconductor device-equipped lead frame to a wire bonding device is performed.
The magazine is carried out in units of magazines each containing 25, 50, etc. lead frames. FIG. 6 is a perspective view showing an example of a semiconductor device lead frame after wire bonding is completed.

Then, as a wire bonding system of a method of transporting in magazine units, it is disclosed in Japanese Patent Laid-Open No. 24565/1992.
There is one introduced by the publication No. 1. It is a device in which a plurality of wire bonding devices having a transfer path are arranged in a straight line so that all the transfer paths are in communication to form one long transfer path.

Further, a belt type magazine conveying mechanism in which a pair of rotating rollers which are spaced apart from each other are belted is provided in the conveying path of each wire bonding apparatus.

[0005]

By the way, JP-A-4-
In the conventional magazine transport mechanism introduced in No. 245651, the magazine is electrified by the friction between the belt and the magazine, and as a result, the static electricity is generated through the wire inside the semiconductor device mounted on the lead frame housed in the magazine. However, there is a problem in that electrostatic discharge occurs. Therefore, a magazine transport mechanism for transporting a magazine by a metal roller supported by a metal roller support has been devised. According to this, the magazine can be indirectly grounded by grounding the roller support, and as a result, it is possible to prevent the generation of static electricity due to the friction between the magazine and the roller, thus preventing the magazine from being charged. Because you can do it.

However, there is a problem in transporting the metal magazine by the metal roller. The problems are that the magazines and rollers are easily scratched, their lifespan is short, and that the semiconductor device is prone to dust generation. Therefore, it is necessary to cover the surface of the roller that conveys the magazine with an elastic resin, for example, urethane. However, since the resin generally has an insulating property, the magazine is eventually charged and electrostatic damage occurs inside the semiconductor device. The problem that it may occur cannot be avoided. However, since some carbon-based resins have conductivity, if they are used as a magazine transporting roller, it is possible to eliminate the risk of electrostatic breakdown. However, the carbon-based conductive resin has a problem that a large amount of dust is generated due to friction with the metal magazine.

The present invention has been made to solve the above problems, and an object of the present invention is to prevent a magazine from being charged in a magazine transport mechanism for transporting a metal magazine by an insulating material. .

[0008]

The magazine transport mechanism of the present invention is characterized in that it has grounding means for grounding the magazine to be transported.

[0009]

According to the magazine transport mechanism of the present invention, since the magazine is grounded by the grounding means while being transported, it cannot be charged even if friction occurs with the transport member made of an insulating material during the transport process. Therefore, it is possible to prevent the occurrence of trouble caused by the charging of the magazine.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The magazine transport mechanism of the present invention will be described in detail below with reference to the illustrated embodiments. 1 to 6 are for explaining one embodiment of a magazine carrying mechanism of the present invention, and FIG. 1 is a perspective view showing an entire wire bonding system equipped with the magazine carrying mechanism. First, referring to FIG. The outline of the wire bonding system will be described.

[0011] Reference numerals 1, 1, ... Are wire bonding devices having substantially the same structure and function, each having a magazine transport mechanism 2 on the front side. Wire bonding equipment 1, 1, ...
Are arranged side by side so that the respective magazine transport mechanisms 2, 2, ... Align to form a single transport path. Reference numeral 3 denotes a magazine take-in section for taking the magazine of each wire bonding apparatus 1 near the wire bonding section. The magazine transport mechanisms 2, 2, ... Are each covered with a cover.

4a is a wire bonding apparatus 1, 1, ...
An automatic loading station for supplying a magazine from one end thereof to a magazine conveying path consisting of 5 is an automatic wiring inspection device for inspecting the wiring shape of the lead frame of the magazine which has completed the wire bonding process, 4b.
Is an automatic unloading station for taking out the magazine which has undergone the inspection process by the automatic wiring inspection device 5.

FIG. 2 is an enlarged perspective view of the magazine transport mechanism. Next, the magazine transport mechanism 2 will be specifically described with reference to FIG. Reference numeral 6 denotes a roller support, which has a U-shaped cross section and is provided substantially horizontally so that the pair of side pieces 6a and 6b face upward and the intermediate piece forms a bottom portion. A plurality of rotating shafts 7, 7, ... Are rotatably attached to the upper portions of 6a, 6b at substantially regular intervals. This interval is set to be at least smaller than the length of the magazine.

One end of each of the rotary shafts 7, 7, ... Penetrates the side piece 6a of the roller support 6 so as to project to the outside (front side), and a pulley 8 is fixed to each of the projecting ends. ing. Then, the side pieces 6a of the rotary shafts 7, 7, ...
Conveyor rollers 9 are fixed to both ends of the portion between 6b.

A rotary support 10 is rotatably attached to one end (right end) of the roller support 6. Similarly to the roller support body 6, the rotation support body 10 has a rotating shaft 7,
, ..., pulleys 8, 8, ... And conveyance rollers 9, 9 ,.
The rotary support 10 and the roller support 6 compose one transport path in the folded state as shown in the figure, but when the rotary support 10 is rotated by approximately 90 degrees to be oriented, It is designed so that a part of it can be cut and the hands and human body can get inside to perform maintenance. Reference numerals 11 and 11 are stoppers that define the rotation angle of the rotation support body 10.

Reference numerals 12 and 12 denote belts wound around pulleys 8 and 8 fixed to one end of each of rotary shafts 7 of the roller support 6 and the rotary support.
By rotating 2 the conveying rollers 9,
The magazines 9 can be rotated to convey the magazine.
In addition, 13, 13, ... Are idle cars. 14 is a motor,
The rotation of the belt 12a, the transmission roller 15 and the belt 1
It is transmitted to the belt 12 on the side of the roller support 6a via 2b, and is transmitted to the belt 12 on the side of the rotation support 10 via the belt 12a, the transmission roller 15 and the belt 12c.

Therefore, the roller support 6 and the rotary support 1
0 of the transport rollers 9, 9, ... When the motor 14 rotates,
They can all rotate in the same direction and thus carry magazines. .. are guide wheels (cam followers), which are rotatably attached to the support shafts. The support shafts of the respective guide wheels 16, 16, ... Are side pieces 6a, 6 of the roller support body 6 and the rotation support body 10.
b and 10a, 10b are planted at appropriate intervals on the upper end surfaces thereof. The guide wheels 16, 16, ... Are the transport rollers 9,
It plays the role of guiding the magazines conveyed by 9, ...

FIG. 3 illustrates the transfer of the magazine between the magazine transport mechanism 2 and the wire bonding section of the wire bonding apparatus. Reference numerals 17 and 17 denote magazine lifting members, which are driven by an elevator groove (not shown) and lifted a magazine 18 on the magazine transport mechanism 2 to transfer it to transport arms 19 and 19 which can move forward and backward, and conversely, from the transport arms 19 and 19 to magazines. It plays the role of receiving 18 and soft landing on the magazine transport mechanism 2. In the normal state, the rollers are retracted to a position lower than the conveying rollers 9, 9, ....

Numeral 20 is a grounding means for carrying the magazine 1 to be conveyed.
8 is grounded, and a plurality of metal brackets 26, 26, ... Have a roller support member with a pitch less than the length of the magazine 18 so that the magazine 18 transported by the magazine transport mechanism 2 is always grounded during transportation. 6 and the rotary support 10. FIG. 4 shows one grounding means 2
It is a perspective view which expands 0 and omits the bracket 26, and demonstrates the earthing | grounding means 20 according to this figure.

Reference numeral 21 denotes a metal rotating piece, the middle portion of which is a support shaft 22.
It is rotatably supported by. In addition, the support shaft 22 is one side piece 6b, 10b of the roller support 6 and the rotation support 10.
4 is attached to the inner surface of the bracket 26, and a bracket 26 (not shown in FIG. 4) is formed to project. Reference numeral 23 denotes a metal dust-prevention bearing rotatably attached to one end of the rotating piece 21, and 24 has one end locked or fixed to the other end of the rotating piece 21 and the other end to a bracket 26. A fixed metal spring is used to move the rotating piece 21 to one end thereof, that is, the bearing 2
3 is urged in the clockwise direction in FIG. 4 so that it goes to the upper side.

Reference numeral 25 denotes a stopper, which plays a role of regulating the rotation of the rotating piece 21 in the clockwise direction so as not to exceed a certain limit. Normally, the grounding means 20 is in a state in which the rotating piece 21 is rotated clockwise by the action of the spring 24 to an angle at which the rotation is regulated by the stopper 25. The height of the bearing 23 is set high enough to contact the outer bottom surface of the magazine 18 to be transported.

Therefore, when the magazine 18 reaches the grounding means 20, the bearing 23 is moved to the magazine 1 as shown in FIG.
Due to the weight of 8, the rotating piece 21 is rotated counterclockwise in FIG. 3 against the elastic force of the spring 24. Therefore, the bearing 23 is elastically brought into contact with the bottom surface of the magazine 18 by the elasticity of the spring 24 while the magazine 18 passes over the bearing 23. As a result, the magazine 18 is grounded via the grounding means 20. It will be electrically connected to and will be grounded.

Therefore, it is possible to prevent the magazine 18 from being charged, and eventually to prevent electrostatic breakdown inside the semiconductor device mounted on the lead frame in the magazine 18. FIG. 5 is an explanatory view of the arrangement position of the grounding means 20, and regarding the grounding means 20, only the bearing 23 is shown to show the position of the grounding means 20. By disposing a plurality of grounding means 20 at substantially the same pitch as the length of the magazine 18 as shown in this figure, the magazine 18 is always grounded via one of the grounding means 20 while being transported by the magazine transport mechanism 2. Can be done. Therefore, charging can be prevented very effectively.

Incidentally, when the magazine 18 is held by the transfer arms 19 and 19, the magazine 18 is not grounded by the grounding means 20. Therefore, in this embodiment, the transfer arms 19 and 19 are made of metal and are grounded. With this configuration, the grounding is performed even when the carrier arms 19 are carrying the carrying arms. The grounding means is not limited to the one shown in the figure, and any other means may be used as long as it can ground the conveyed magazine 18 without hindering its conveyance.

[0025]

The magazine carrying mechanism of the present invention is characterized by having a grounding means for grounding the carried magazine. Therefore, according to the magazine transport mechanism of the present invention, since the magazine is grounded by the grounding means while being transported, even if friction occurs with the transport member made of an insulating material during the transportation, the magazine cannot be charged. Therefore, it is possible to prevent the occurrence of trouble caused by the charging of the magazine.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire wire bonding system including a plurality of wire bonding devices having an embodiment of a magazine transport mechanism of the present invention.

FIG. 2 is a perspective view showing one embodiment of a magazine transport mechanism of the present invention.

FIG. 3 is a perspective view illustrating transfer of a magazine between a magazine transport mechanism and a wire bonding unit side.

FIG. 4 is an enlarged front view of grounding means.

FIG. 5 is a position explanatory view of a grounding unit.

FIG. 6 is a perspective view showing an example of a wire-bonded lead frame.

[Explanation of symbols]

 1 Wire Bonding Device 2 Magazine Transport Mechanism 7 Rotating Shaft 9 Transport Roller 18 Magazine 20 Grounding Means

Claims (1)

[Claims] 1. A magazine transport mechanism for transporting a metal magazine by an insulating material, comprising a grounding means for grounding the transported magazine.