JPH0352751Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a loading device for thin strip-shaped workpieces. Specifically, the strip-shaped workpiece supplied on a guide rail is fed by a fixed length by a feed roller, and then by a feed claw. Furthermore, it relates to a loading device that feeds a fixed amount forward.

PRIOR ART Lead frames used in the manufacturing process of semiconductor devices are stored and transported in parallel in a magazine, which is a lead frame alignment/storage jig. The sheets are taken out one by one and fed onto a guide rail in a semiconductor manufacturing process such as a pellet mounting process to be fed to a fixed size. The loading device that takes out the lead frame from this magazine onto the guide rail and feeds it by a fixed length is generally one that feeds the lead frame intermittently using a continuously rotating feed roller and an intermittent moving feed pawl. This will be explained below with reference to FIGS. 8 through 8.

In FIGS. 5 and 6, 1 is a horizontally installed guide rail, 2 is a lead frame that is intermittently fed on the guide rail 1, and 3 is a guide rail 1.
A work supply means that supplies the lead frame 2 to the starting end of the guide rail 1. For example, an elevator 4 installed near the starting end of the guide rail 1 so as to be able to move up and down, and a work supply means that supplies the lead frame 2 to the starting end of the guide rail 1 behind the magazine 5 installed on the elevator 4. It has a pusher 6 that reciprocates at a constant stroke at a height. The elevator 4 moves up intermittently according to the arrangement pitch of the lead frames 2 stored in the magazine 5, and lifts the top lead frame 2 in the magazine 5.
feed it to the height of guide rail 1, and pusher 6
moves forward through the opening 7 formed in the back plate of the magazine 5 every time the magazine 5 rises by one pitch, cuts out the uppermost lead frame 2 to above the guide rail 1, and then repeats the movement of retreating.

Reference numeral 8 denotes a feed roller disposed at a fixed position at the rear end of the guide rail 1, and continuously rotates in the direction of the arrow in FIG. 9, 9... are a plurality of feed claws arranged at regular intervals along the guide rail 1 in front of the feed roller 8, and as shown in the arrows in Fig. 6, they move upward, forward in the workpiece feed direction, descend, and feed the workpiece. Perform a series of backward movements in the direction. 10 is a feed rod that supports the feed claws 9, 9, and makes a series of movements. Feed claws 9, 9...
rises from below the lead frame 2 on the guide rail 1, is inserted into, for example, the feed holes 11, 11, etc. formed in advance on the lead frame 2, moves forward with a fixed stroke, and aligns the lead frame 2 on the guide rail 1. to send the fixed size. In addition, the drawing shows one in which one lead frame 2 is fed by a fixed distance using two feeding claws 9, 9.

To explain the operation of this loading device, first, when the elevator 4 rises one pitch, the pusher 6 moves forward by a fixed stroke to cut out one lead frame 2 from the magazine 5 until it reaches the feed roller 8, and the pusher 6 moves backward. do. The feed roller 8 rotates continuously, and the lead frame 2 is cut out.
is fed forward along guide rail 1. At the timing when this lead frame 2 is separated from the magazine 5, the elevator 4 is further raised by one pitch, and the next uppermost lead frame 2 is cut out.

The first cut out lead frame 2 stops when it is fed to a fixed position where its rear end is separated from the feed roller 8. Then, the feed claws 9, 9, . 11. As shown in FIG. 8, the next feed claws 9, 9, . . . move forward to a predetermined position C, feed the lead frame 2 by a fixed distance, and then descend to a position D, retreat, and return to a position A. During this time, the feed roller 8 feeds the next lead frame 1 to position B, and the above-described operation is repeated thereafter.

Problems to be Solved by the Invention By the way, the rear end of the lead frame 2 that has been fed a fixed length by the feed roller 8 separates from the feed roller 8 and stops, and this stopping position is the fixed position at which the next feeding claw 9 starts feeding. However, the position at which the lead frame 2 separates from the feed roller 8 and stops may differ slightly due to warping or twisting of the lead frame 2. Therefore, the feed claw 9
When the lead frame 2 rises from the rear lower fixed position A, the axis with the corresponding feed hole 11 is misaligned, and the feed claw 9 lifts the lead frame 2 and feeds it forward while tilting the lead frame 2 to perform post-process work such as pellet mounting. This may make it difficult to move the lead frame 2 or make it impossible to feed the lead frame 2. Therefore, when the above-mentioned trouble occurs, the entire loading device is stopped and corrected. However, this had the problem of poor operating rates.

Means for Solving Problems The purpose of this invention is to smooth the handover of workpiece feeding from the feed roller to the feed pawl of a loading device that intermittently feeds a strip-shaped workpiece by taking over from the feed roller to the feed pawl. This object has been achieved by attaching a vibrating member that can move in and out of the vicinity of the front and rear ends of a workpiece that has been fed a fixed distance by a feed roller and stopped, and that can vibrate in a direction parallel to the workpiece feeding direction.

Function The vibrating member is made of a rubber material, etc., and is placed near the front and back of the feed claw that takes over and engages the workpiece sent by the feed roller, so that if the workpiece deviates from its normal position, it will hit the workpiece. It vibrates and automatically corrects the misalignment of the workpiece to ensure that the feed claw is inserted into and locked into the workpiece accurately.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

This figure shows an application of the present invention to the loading device of FIG. 5, and the same parts as in FIGS. 5 and 6 are denoted by the same reference numerals, and the explanation thereof will be omitted. The difference is that the following vibration member 1 is installed at two locations along the guide rail 1.
The only difference is that 2 and 13 have been added. Vibrating member 1
Reference numerals 2 and 13 are elastic materials such as rubber plates, and are connected and supported by vertical drive units 14 and 14, respectively, each of which has a built-in vibration source. is disposed forward from the uppermost surface of the feed roller 8 at a position a little farther than the length of the lead frame 2 so as to be movable up and down and vibrate in the front and rear directions.

Both vibrating members 12 and 13 are interlocked, and while the lead frame 2 is moving on the guide rail 1, both of them remain stationary at a position where they do not interfere with the movement of the lead frame 2. Then, the lead frame 2 is fed forward by the feed roller 8 in the same manner as before, and the lead frame 2 is moved forward by the feed roller 8.
When the lead frame 2 moves away from the lead frame 1 and temporarily stops on the guide rail 1, the vibrating members 12 and 13 face each other near the front and rear ends of the lead frame 2, which has risen and is stopped, for example. As shown in Fig. 3, the rear end position of the lead frame 2 at its normal stop position is M1, and the front end position is _M1 .
M ₂ and the maximum deviation amount of the stop position of the lead frame 2 from the normal position is N, then the vibration member 1
Those at the rear of Nos. 2 and 13 rise to their home positions N or more behind position M ₁ , and those at the front rise to their home positions at least N or more ahead of position M ₂ . Therefore, lead frame 2
Even if the vibration members 12 and 13 are displaced, the vibration members 12 and 13 will not be lifted up.

Such raising of the vibrating members 12, 13 is performed at the same time as, or slightly behind, the raising of the feed pawl 9, and when the vibrating members 12, 13 are raised, they vibrate back and forth between positions M ₁ and M ₂ . Then, there is no problem if the lead frame 2 stops at the normal position and the feed pawl 9 is inserted normally into the feed hole 11 as shown in FIG. As shown in Fig. 4, when the feed claw 9 lifts the lead frame 2, the vibration of the vibrating members 12 and 13 pushes the lead frame 2 to its normal position and moves it into the feed hole 1.
The feed claw 9 is inserted into 1. When the vibrating members 12 and 13 automatically correct the position of the lead frame 2, they are lowered to a position where they do not get in the way, and the lead frame 2 is fed by a fixed length by the feed pawl 9. The above operation is performed every time the feed operation from the feed roller 8 to the feed pawl 9 of the lead frame 2 is taken over.

Note that the present invention is applicable not only to a loading device for lead frames for semiconductor devices, but also to a feeding device for belt-shaped workpieces in general.

Effects of the invention According to the invention, the transfer of the workpiece from the feed roller to the feed pawl can always be carried out reliably, making it possible to increase the speed of workpiece feeding, improving work efficiency and improving the operating rate of the loading device. In addition, it is easy to implement because it is only necessary to attach a vibrating member that operates independently to existing equipment.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view showing an embodiment of the present invention, and FIGS. 3 and 4 are schematic side views for explaining the workpiece position correction operation of the apparatus shown in FIG. 1. . 5 and 6 are a plan view and a side view of a conventional loading device, and FIGS. 7 and 8 are schematic side views for explaining the operation of the device shown in FIG. 6. 1...Guide rail, 2...Work [lead frame], 8...Feed roller, 9...Feed claw, 1
2, 13... Vibration member.

Claims (1)

[Scope of utility model registration request] A guide rail that guides the movement of a strip-shaped workpiece, a feed roller whose outer peripheral surface partially protrudes onto the guide rail at the starting end of the guide rail and rotates to move the workpiece fed onto the guide rail, and a feed roller in front of the feed roller. A feed pawl is placed along the guide rail, protrudes and retracts onto the guide rail, engages with the workpiece, and reciprocates over a certain distance for intermittent feeding. A loading device comprising a vibrating member that protrudes and retracts from and vibrates in the feeding direction of the workpiece to engage the workpiece with the feeding claw.