JPS62153022A - Transport device - Google Patents

Abstract

PURPOSE:To enhance the operability by arranging a lower, an upper conveyor and an elevator at one of the ends of a transport path, and thereby enabling accommodation in the same magazine after a specified processing is applied to each work taken out of one magazine. CONSTITUTION:The body of elevator 44 is driven upward, and the oversurface of No.2 slider 57 positions a little over than an upper conveyor 24, and the No.2 slider 57 is driven toward the front of No.1 slider 53. Then this No.1 slider 53 is driven in the direction of advancing, and the front of No.1 slider 53 intrudes to one of the sides of said upper conveyor 24, and thereafter the body of elevator 44 sinks, whereby a magazine 35 on No.2 slider 57 is placed. Then No.1 slider 53 is driven backward, and the upper conveyor 24 is driven, and now the magazine 35 placed there is transported in the direction as shown by arrow.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conveyance device for taking out an unprocessed workpiece from a magazine, processing it, and then storing the workpiece in the magazine again.

[Technical background of the invention and its problems].

For example, in the manufacturing of semiconductor devices, in order to pull out the electrodes on the semiconductor chip after the wafer process is completed and use them as leads for the package, there is a process called gui bonding, which fixes the semiconductor chip to the lead frame, and connects the electrical conductor on the chip to the leads of the lead frame. Wire bonding for wiring, resin sealing for forming cages, etc. are performed.

In these steps and between steps, the lead frame as a workpiece is manufactured as a unit, so transportation of the lead frame is important.

FIG. 4 shows a part of a conveying device for conveying lead frames in the wire bonding process, in which lead frames 2 are stored in a magazine 1 and pulled out one by one by a feed claw 3, and a guide rail 4 It is mounted on the top of the guide rail 4, is transported by other feed claws 3/, 3/I, and is stored in another empty magazine 5 placed at the other end of the guide rail 4. These magazines 1 and 5 are placed on magazine elevators 6 and 7, and the magazine elevators 6 and 7 are connected to sliding shafts 12 and 13, 14 by lead screws 10 and 11 driven by the rotation of motors 8 and 9, respectively. 15 up and down. In addition, a wire bonding device 16 is provided in the center of the idle rail 4, and as its arm 17 moves, the wire bonding device 16 connects the electrodes of the bonded semiconductor chip 18 of the lead frame 2 below to the lead frame. A wire 19 is wired between the two leads.

Here, the guide rail 4, magazine elevator 6.7,
The feed claw 3 and a drive mechanism for the feed claw (not shown) constitute a conveyance device for the lead frame 2.

By the way, according to such a conveyance device, the conveyance path of the lead frame 2 is a straight line, and elevators 6 and 7 are provided at both ends of the conveyance path. Therefore, not only does the overall length become longer and the device becomes larger, but also two elevators 6.7, which are complicated in structure and expensive, are required, resulting in increased costs. Further, it was necessary to manually set the magazine 1 containing unprocessed lead frames 2 into one elevator 6 and the empty magazine 5 into the other elevator 7. Therefore, every time the work for one magazine 1,5 minutes is completed, the work must be interrupted and each magazine 1,5 described above must be replaced with a new one, resulting in poor work efficiency.

[Purpose of the invention]

It is an object of the present invention to provide a conveying device which can be made compact and have a simple structure, and which does not require interrupting the work every time the work for one magazine is completed.

[Summary of the invention]

This invention includes a lower conveyor on which a magazine containing unprocessed workpieces is placed and conveys the magazine to a take-out position, and an elevator disposed opposite to one end of the upper and lower conveyors of the lower conveyor and the upper conveyor. A positioning mechanism is provided for positioning the magazine taken out from the lower conveyor of the machining machine between a position for taking out the work from the magazine and a position for storing the processed work.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The conveying device shown in FIG. 2 includes a main body 21. As shown in FIG. A first wall 22 is erected on one end side of the upper surface of the main body 2 in parallel with the one end surface of the main body 2. As shown in FIG. 1, a lower conveyor 23 is provided horizontally at the bottom of the outer surface of the first wall 22, and an upper conveyor 24 is provided horizontally above the lower conveyor 23. Each conveyor 23, 24 has a pair of endless belts 25 that are parallel to each other and are spaced apart from each other in the horizontal direction.
is stretched between the driven pulley 26 and the driving workpiece 27. The driven workpiece 26 and the drive pulley 27 are each rotatably provided on a support shaft 28 whose one end is attached to the first wall body 22. In addition, the lower conveyor 23
The drive pulley 27 is rotatably driven by a first motor 31 via a drive belt 29, and the drive work 27 of the upper conveyor 24 is rotated by a second motor 33 via a drive belt 32. It is designed to be rotationally driven. Each motor 31, 33 is fixedly attached to the first wall 22. Friendly, a support plate 34 is provided between the pair of endless belts 25 of each conveyor 23, 24 except for one end on the driven pulley 26 side. These receiving plates 34 correspond to the magazines 3 placed on each conveyor 23, 24.
5 to prevent the endless belt 25 from sagging significantly.

The lower conveyor 23 carries an unprocessed workpiece, for example, a lead frame 36 that has not been wire bonded.
A plurality of magazines 35 are placed in which the magazines 35 are stored in multiple stages at predetermined intervals in the vertical direction. The magazine 35 located at the leading edge of the lower conveyor 23 in the traveling direction shown by the arrow in FIG.
y/# J It is designed to wait at the position where it touches 7. On the upper conveyor 24, a magazine 35a containing lead frames 36 on which wires have been wound as will be described later is placed and carried out. The magazine 35a located at the leading edge of the upper conveyor 24 in the traveling direction shown by the arrow in FIG. It is now possible to do so.

An elevator 41 is arranged at a position facing one end of the lower conveyor 23 and the upper conveyor 24. This elevator 4I is erected at one end in the width direction of the main body 2 so as to be orthogonal to the first wall 22.
It is provided with a wall body 42 of. A guide groove 43 is cut into the inner surface of the second wall 42 over the entire length in the height direction, and one vertical side of the elm body 44 is slidably supported in the guide groove 43. This elevator body 4
As shown in FIG. 2, a nut body 45 is fixed to one end of the nut body 4 in the width direction, and a feed screw 46 is screwed into this nut body 45.

The upper and lower ends of the feed screw 46 are rotatably supported by a pair of support pieces 47 protruding from one side of the second wall 42 . A driven pulley 48 is attached to the lower end of this feed screw 46.
is fitted.

A drive belt 52 is stretched between the driven pulley 48 and a drive pulley 51 that is rotationally driven by a third motor 49 disposed near the second wall 42 . Therefore, when the feed screw 46 is rotationally driven by the third motor 49, the elevator main body 44 is driven vertically along the guide groove 43 via the nut body 45.

Further, on the upper surface of the other horizontal side of the elevator main body 44, a first slider 53 is provided which is slidable in the same direction as the traveling direction of each of the conveyors 23, 24. An L-shaped first connector 54 is attached to the front end of the side surface of the first slider 53. A rod 56 of a first air cylinder 55 provided on the side surface of the elevator main body 44 is connected to this connector 54 . therefore,
The first air cylinder 55 operates and its rod 56
When the first slider 53 is biased in the protruding direction, the first slider 53 slides in the protruding direction from the horizontal side of the elevator main body 44.

A second slider 57 is provided on the upper surface of the first slider 53.
is provided so as to be slidable in the same direction as the first slide 153. The length of the second slider 57 is approximately half the length of the first slider 53. Further, a second connector 58 is fixed to the front end of the side surface of the second slider 57. A rod 61 of a second air cylinder 59 provided on the side surface of the first slider 53 is connected to the second connector 58 . When the mouth of the second air cylinder 59 and the drawer 1 are urged in the projecting direction, the second slider 57 is located on the front end side of the first slider 53, and the rod 6 is in the retracting direction. When the second slider 57 is biased, the second slider 57 is positioned at the rear end side of the first slider 53.

On the other hand, a conveyance path 62 shown by an arrow in FIG. 2 is formed on the upper surface of the main body 21. When the second slider 57 is in the forward position on the first slider 53 as shown in FIG.
The other end of the unloading section is opposite to the slider 57 of the first
The second slider 57 is formed on the slider 53 to face the second slider 57 which is in the retracted position.

The lead frame 36 taken out from the magazine 35 transferred from the lower conveyor 23 onto the second slider 57 is supplied to this conveyance path 62 as described later. To take out the lead frame 36 from the magazine 35, a means such as a feeding claw blade type shown in FIG. 4 may be used, for example.

Further, the lead frame 36 placed on the conveying path 62 may be conveyed by another feeding claw or by using a conveying means such as a roller, and there is no limitation in this respect either. A wire ending device 63 is disposed in the middle of the conveyance path 62, and the lead frame 36 is conveyed and positioned below the wire ending device 63 by moving its arm 64.
An IL wire 65 is arranged.

Next, the operation of the conveying device having the above structure is shown in Fig. 3 (1) to 0.
The explanation will be based on 1). FIG. 3(1) shows a state in which a plurality of magazines 35 containing lead frames 36 that are not subjected to wire bonding are placed on the lower conveyor 23, and the most advanced magazine 35 is placed on the first stock It is positioned in contact with the armpit 37. At this time,
The elevator main body 44 is positioned such that the upper surface of the second slider 57 is located slightly below the lower surface of the magazine 35. In addition, the second slider 57
is positioned on the front end side of the first slider 53.

When the operation is started in this state, the first step is as shown in Figure 3 (2).
), the first slider 53 is driven in the forward direction by the first air cylinder 55, and the second slider 57 located on the front end side of the first slider 53 moves to the most advanced position on the lower conveyor 23. It invades the lower part of the magazine 35. Next, as shown in FIG. 3 (3), the elevator main body 4
4 is driven in the upward direction, the magazine 35 is transferred onto the second slider 57 and the magazine 35 is moved onto the first slider 57.
The strike of the ball is raised to a height where it loses its hold on the pad 37.

Next, the first air cylinder 55 is driven in the opposite direction and the first slider 53 is driven in the backward direction as shown in FIG. The nine magazines 35 are positioned so as to face the loading section of the transport path 62. After that, as shown in Figure 3 (
As shown in 5), the elevator main body 44 is driven upward,
Lead frame 36 is stored in the magazine 35 and is in the next upper stage.
is positioned at the same height as the conveyance path 62. Then, the uppermost IJ-board frame 36 is taken out by a feed claw (not shown), transferred onto the conveyance path 62, and conveyed. After this lead frame 36 is positioned at the wire ending device 63, it is transported again to the unloading section of the transport path 62. During this time, the elevator main body 44 is driven upward at a pitch P corresponding to the interval between the lead frames 36 held in the magazine 35, as shown in FIG.
The leads 7v-mu 36 are supplied to the conveyance path 63 one by one.

On the other hand, when the lead frame 36 is wire bound by the wire bonding device 63 and reaches the unloading section of the conveyance path 62, the second air cylinder 59 is activated and the wire is bound as shown in FIG. 3 (6). The second slider 57 is driven to the rear end side above the first slider 53, and the magazine 35
is positioned so as to face the unloading section of the transport path 62. Next, the elevator main body 44 is driven and the topmost part of the magazine 35 from which the lead frame 36 is taken out is positioned at the same height as the conveyance path 62.

Then, the lead frame 36 is taken into the uppermost position of the magazine 35 by appropriate means (eg, feed claws, etc.). In this way, the taking out of the lead frame 36 from the magazine 35 and the taking in of the lead frame 36 on which the wire has been finished are carried out in a predetermined cycle, and the last lead frame 36 in one magazine 35 is taken out in a predetermined cycle.
The process ends in the state shown in Figure 3 (7).

Finally, as shown in Fig. 3 (8), the elevator main body 44
is driven in the upward direction, the upper surface of the second slider 57 is positioned slightly higher than the upper conveyor 24, and the second slider 57 is positioned above the first slider 5.
3 is driven toward the front end side. Thereafter, as shown in FIG. 3(9), the first slider 53 is driven in the forward direction and the front end of the first slider 53 enters one end of the upper conveyor 24, and then the elevator main body 44 Figure 3 αQ
By descending as shown in FIG.
Magazine 35 on top of tab 7, and magazine 35 containing lead frame 36 for which wire siding has been completed, are placed. Next, as shown in FIG. 3 α■, the first slider 53 is driven in the backward direction, and the upper conveyor 24 is driven to convey the loaded magazine 35 in the direction shown by the arrow. Yes, one magazine 35
The wire ending work is completed. Afterwards,
A new work will be started again from the state shown in FIG.

That is, according to the conveyance device having the above structure, the lower conveyor 23, the upper conveyor 24, and the elevator 41 are arranged at one end side of the conveyance path 62, and after wire bonding is performed on the lead frame 35 taken out from one magazine 35, We made sure that the same magazine 35 could accommodate the lead frame 35 that had been wire-sounded.

Therefore, the overall length of the device can be shortened to make it more compact, and since only one elevator 41 is required, the structure can be simplified. Also, the lead frames 3 housed in a plurality of magasyns 35 placed on the lower conveyor 23
5, wire ending can be performed continuously, improving work efficiency. Furthermore, there is no need to prepare an empty magazine 35 to accommodate the lead frame 35 with wire endings.

Note that the conveyance device of the present invention is not limited to one that performs wire ending on a lead frame, and can also be used to take out a workpiece stored in a magazine, perform various processing on it, and then store it in the magazine again. It is a passionate theory that it can be applied to any given process.

〔Effect of the invention〕

As described above, in this invention, a lower conveyor, an upper conveyor, and an elevator are arranged at one end of the conveyance path, and after performing a predetermined process on a work taken out from one magazine, this work is transferred to the same magazine as mentioned above. It can be stored in. In other words, since it is only necessary to place a pair of conveyors and an elevator at one end of the conveyance path, not only can the overall length of the equipment be shortened and the equipment can be made more compact, but also only one elevator, which is expensive and has a complicated structure, can be used. Therefore, the structure can be simplified and costs can be reduced. In addition, it is possible to place multiple magazines on the lower conveyor and process all the workpieces stored in the multiple magazines continuously, so one continuous operation can be performed for one magazine. The work efficiency can be improved compared to the conventional method, which could only be used for several types of workpieces.

Furthermore, since there is no need to prepare an empty magazine to store processed workpieces, this also has the advantage of improving work efficiency.

[Brief explanation of drawings]

Fig. 1 is a side view of the arrangement of a pair of conveyors and an elevator showing an embodiment of the present invention, Fig. 2 is a perspective view of the overall schematic configuration, and Fig. 3 (1) to α are the same. FIG. 4 is a perspective view of a conventional conveying device. 23...Lower conveyor, 24...Upper conveyor, 3
5... Magazine, 36... Lead frame (work), 4... Elevator, 44... Elevator body (transfer mechanism), 53... First slider (transfer mechanism)
, 57... second slider (positioning mechanism). Applicant's agent Patent attorney Takehiko Suzue 35a Figure 2 No. 4 Q+

Claims (1)

[Claims] A lower conveyor on which a magazine containing unprocessed workpieces is placed and transports the magazine to the take-out position, and one end of the lower conveyor that is placed above the lower conveyor and becomes the carry-in side aligned with the transport side end of this lower conveyor. an upper conveyor that carries out a magazine containing processed workpieces;
A transfer mechanism is arranged between the transport side end of the lower conveyor and one end of the upper conveyor on the carry-in side and takes out the magazine from the lower conveyor and transfers it to the upper conveyor. 1. A conveyance device comprising: an elevator having a positioning mechanism for positioning a workpiece from the magazine at a position where the workpiece is taken out and a position where the processed workpiece is stored.