JPH0447159Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lead frame conveying device equipped with an extrusion mechanism.

[Conventional technology]

Conventionally, in IC manufacturing equipment, a lead frame housed in a magazine was extruded by an extrusion mechanism to a bonding stage on a carrier, bonding work was performed there, and after the work was completed, the lead frame was housed in another magazine and removed. Magazine changers are widely known.

For example, as shown in FIG. 3, a magazine 20 containing a large number of lead frames therein is lowered from above along a magazine guide 22 by an elevator 21, and reaches the side of a carrier 23. Thereafter, while intermittently descending one lead frame at a time, the lead frame extrusion mechanism 24 pushes out the accommodated lead frames one by one to the bonding station 23a on the carrier 23. The lead wires of the extruded lead frame are welded by the bonding arm 23b, and the completed lead frame is placed on the opposite side of the carrier 23.
The magazine 20' is housed in a magazine 20' which is lowered by an elevator 21'. When the magazine 20' is full, it is removed by the ejecting mechanism 25', and when the magazine 20 is empty, it is similarly removed forward by the ejecting mechanism 25.

As shown in FIG. 4, the ejecting mechanism 24 in the magazine changer includes an air cylinder 27 and an ejecting member 26 that moves along a guide rail 28 due to the operation of the air cylinder.
The extrusion member 26 is composed of a main body portion 26a and an extrusion pawl 26b as an extrusion piece. When the extrusion member 26 reciprocates as shown by the arrow, the extrusion pawl 26b moves in and out of the hole in the magazine 20 to transfer the lead frame housed inside to the bonding stage 23a on the carrier 23.
It's starting to push out.

[Problem that the invention attempts to solve]

However, since the extrusion member 26 of the conventional extrusion mechanism 24 shown in FIG. Even if an extrusion error occurs, the air cylinder 27 continues to operate and the extrusion pawl 2
6b continued to move, which often caused problems in handling and lead frame damage.

In addition, as a lead frame extrusion device, a pusher that slides back and forth with a spring is provided on a holder, and the holder is connected to a drive cylinder with a rod to move the pusher in and out of the magazine.
195129), but the holder and pusher are nested, and the guides are in multiple locations, making it difficult to maintain the operation, guaranteeing accuracy, and safe operation, and having a complicated structure. There was a drawback.

The present invention eliminates these conventional drawbacks and automatically stops the extrusion operation. Even if a lead frame extrusion error occurs, the present invention provides a safe and reliable system that does not cause damage to the equipment or lead frame. It is an object of the present invention to provide an expensive lead frame conveying device with a simple configuration and low cost.

[Means for solving problems]

In the present invention, an arm 3 having an extrusion pawl 1 protruding toward the extrusion direction of the lead frame in the magazine 10 is slidably provided on a guide rail 2.
A drive source arm 4 is slidably provided on the extrusion direction side on the guide rail 2 and is disposed opposite to the arm 3 so as to be able to approach and separate from it, and the arm 3 and the drive arm 4 are pulled together by a spring 12 in a direction. At the same time, an air cylinder 9 is connected to the drive arm 4, and a limit arm 8 is provided in a protruding manner, and a limit sensor 7 that functions as a switch for stopping the air cylinder 9 is connected to the arm 3 in the vicinity of the limit arm 8.
This is a lead frame conveying device characterized in that it is disposed relative to the lead frame.

[Effect]

In the lead frame conveying device of the present invention, the arm 3 and the drive source arm 4 are normally restrained in close contact by the action of the tension spring 12 and are moved in the extrusion direction on the guide rail 2 by the action of the air cylinder 9. Fine movement adjustment is also performed by a spring 12, and the pushing pawl 1 attached to the tip of the arm 3 is moved in and out of the hole in the magazine guide 11, and the lead frame is pushed out softly and smoothly onto the carrier.

If an abnormality occurs such as the lead frame getting caught in the magazine 10 during frame extrusion, a load will be applied to the extrusion pawl 1, and if the load becomes greater than the initial tension of the tension spring 12, the tension spring 12 will be The arm 3 for the push-out pawl and the arm 4 for the drive source are separated to absorb the load. At this time, the limit sensor 7 fixed to the extrusion pawl arm 3 and the limit arm 8 fixed to the drive source arm 4 are moving relatively, so if the load is large, they are separated and the limit sensor 7 is turned off. , the air cylinder 9 is rendered inoperable and its operation is stopped to prevent excessive force from being applied to the lead frame, magazine or other parts and cause damage, and as a result, excessive force is applied to the extrusion pawl 1. acts, it escapes due to the elastic deformation of the tension spring 12,
Forcible extrusion of the lead frame can be prevented and damage to the lead frame can be avoided.

〔Example〕

Embodiments of the present invention shown in FIGS. 1 and 2 will be described below.

Extrusion pawl 1 as extrusion piece of lead frame
The extrusion pawl 1 enters and exits the hole at the rear end of the magazine guide 11 and sequentially extrudes a large number of lead frames housed in the magazine 10 that has descended along the magazine guide 11 one by one.
is fixed to the tip of an L-shaped arm 3 that moves via a guide bearing 5 on a guide rail 2 installed horizontally on the side of the magazine guide 11.

And, adjacent to this extrusion pawl arm 3,
A drive source arm 4 is slidably provided on the guide rail 2 via a guide bearing 6, and is provided so as to be movable relative to the push-out pawl arm 3, and the drive source arm 4 is provided at its upper end. The arm 3 is connected to an air cylinder 9 which is a driving source, and the arm 3 having the push-out pawl 1 and the driving source arm 4 are connected by a tension spring 12, and are connected by drawing them together. Furthermore, a limit sensor 7 and a limit arm 8 are fixed to the outer surfaces of the extrusion pawl arm 3 and the drive source arm 4, respectively. When inactive, the limit arm 8 enters the slit of the limit sensor 7, and in this state, the extrusion pawl arm 3 and the drive source arm 4 are in contact with each other. At this time, the tension spring 12 is still in a stretched state, and the push-out pawl arm 3 and the drive source arm 4 are attracted to each other and restrained by the initial tension.

The extrusion pawl arm 3 and the drive source arm 4 are normally restrained in close contact by the action of the tension spring 12, and move in the extrusion direction on the guide rail 2 by the action of the air cylinder 9, and fine adjustment is also performed by the spring. 12, the extrusion pawl 1 attached to the tip of the extrusion pawl arm 3 is moved in and out of the hole in the magazine guide 11, and the lead frame is smoothly extruded onto the carrier with a soft touch (FIG. 2).

If an abnormality occurs such as the lead frame getting caught in the magazine 10 during frame extrusion, a load will be applied to the extrusion pawl 1, and if the load becomes greater than the initial tension of the tension spring 12, the tension spring 12 will be The arm 3 for the push-out pawl and the arm 4 for the drive source are separated to absorb the load. At this time, the limit sensor 7 fixed to the push-out pawl arm 3 and the limit arm 8 fixed to the drive source arm 4 move relatively.

If the load is large, both arms 3 and 4 will separate as shown in FIG. This disables the air cylinder and stops the pressing operation to prevent excessive force from being applied to the lead frame, magazine, or other parts and causing damage.

[Effect of idea]

In the present invention, an arm with an extrusion claw protruding toward the extrusion direction of the lead frame in the magazine is slidably provided on a guide rail, and a drive source arm is slid on the guide rail in the extrusion direction. The arm and the drive arm are connected to each other in a drawing direction by a spring, and an air cylinder is connected to the drive arm, and a limit arm is provided in a protruding manner. By disposing a limit sensor close to the limit arm, which functions as a switch for stopping the air cylinder, when an excessive load is applied to the extrusion pawl that extrudes the lead frame, the load can be absorbed by the spring. By moving the arm away from the drive source arm while absorbing the energy, and by accurately capturing the separated state of the arm with a sensor and stopping the drive source by turning off the power, the device and the Accidents such as damage to the lead frame can be prevented, and the safety of the device can be greatly improved through smooth operation, making it highly reliable, and the configuration can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 2A is a front view of the operating state, Fig. 3 is a perspective view of a conventional magazine changer, and Fig. 4 is a front view of the embodiment of the present invention. It is a perspective view of the lead frame extrusion mechanism. 1...Extrusion pawl, 2...Guide rail, 3...
... Arm for extrusion pawl, 4... Drive source arm (extrusion member main body), 5, 6... Guide bearing, 7...
...Limit sensor, 8...Limit arm, 9...
...Air cylinder, 10...Magazine, 11...Magazine guide, 12...Tension spring.

Claims (1)

[Scope of utility model registration request] An arm 3 with an extrusion pawl 1 protruding toward the extrusion direction of the lead frame in the magazine 10 is slidably provided on a guide rail 2, and a drive source arm 4 is mounted on the guide rail 2 in the extrusion direction. The arm 3 and the drive arm 4 are connected by a spring 12 in a drawing direction, and an air cylinder 9 is connected to the drive arm 4. A lead frame transfer device further comprising a protruding limit arm 8, and a limit sensor 7, which functions as a switch for stopping the air cylinder 9, located close to the limit arm 8, relative to the arm 3.