JPH03211145A - Lead frame transport method and device - Google Patents

Abstract

PURPOSE:To ensure the positioning of guide rail corresponding to a width change in a lead frame by changing the lift of a cam in the cross direction of the lead frame with external operation, and shifting the guide rail in the cross direction with a follow-up member in contact with a cam surface. CONSTITUTION:When dimensions of a lead frame in width is changed, a lock screw 22 is loosed and guide rails 4a, 4b are made free to move. Then a ball plunger 19 is loosed, a camshaft 12 is moved up and down by a knob 21 and the plunger 19 is clamped at a 1/2psotopm where a bearing 18 at the lower end of the guide rails 4a, 4b is conformed to a desired one amonmultistage disk cams 14-16. In addition, a tension spring 23 comes into contact with one of these cams 14-16 under pressure through the bearing 18. Then, the lock screw 22 is clamped, and the guide rails 4a, 4b are locked in response to the width the lead frame 9. Consequently, width adjustments for these guide rails 4a, 4b can be done easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lead frame transport method and apparatus for transporting lead frames between processes.

[Conventional technology]

FIG. 5 is a perspective view of a conventional lead frame conveying device of this kind. This will be explained based on the figure. The conveying device 1 is equipped with a base 2 formed in a U-shape. A pair of linear guide bearings 3 fixed at both ends
A pair of guide rails 4a and 4b, which are formed in a horizontally long rectangular shape and are parallel to each other, are supported so as to be movable toward and away from each other. Guide rails 4a, 4b
The bearing hole has a flange with a right-hand heel cut in the inner hole 5.
A and a bearing 5b having a left-hand thread cut into the inner hole are respectively fitted, and these bearings 5a.

5b and a pair of bearings 6 provided on the base 2 side,
A screw shaft 7, which has a right-hand thread that threads into a right-hand threaded hole of the bearing 5a and a left-hand thread that threads into a left-hand threaded hole of the bearing 5b, is directly connected to and pivotally supported by a pulse motor 8. Reference numeral 9 denotes a lead frame that is conveyed in the direction shown by the arrow by a heddle (not shown) or the like, and the interval between the guide rails 4a, 4b is adjusted to match the width of the lead frame 9.

With the above configuration, when the pulse motor 8 is rotated by being given a predetermined number of pulses according to the width of the lead frame 9 by the control device (not shown), the screw shaft 7 rotates, and the right-hand and left-hand screws are rotated. Rotation is converted into linear motion by the screw action with the screw, and the guide rails 4a and 4b move toward and away from each other while being guided by the linear guide bearings 3 at both ends, and the distance between them is equal to the width of the lead frame 9. Stop at the matching position.

In this state, the lead frame 9 is attached to the guide rails 4a, 4
b, and is conveyed in the direction of the arrow by a belt (not shown) provided between guide rails 4a and 4db.

- If the dimensions of the lead frames 1 and 9 change, the control device gives the pulse motor 8 a predetermined number of pulses that match the width of the lead frame 9, so the guide rails 4a and 4b are changed in the same way as above. The interval between is adjusted.

[Problem to be solved by the invention]

However, in such a conventional lead frame conveying device, an expensive pulse motor driver for driving the pulse motor 8 must be provided externally, so there is a problem that the entire device cannot be provided at a low cost. Also,
Guide rail 4a.

In the drive system for moving the guide rail 4b, there is provided a rotation transmitting part by screwing the threaded part of the screw shaft 7 and the tapped holes of the bearings 5a, 5b, so that the guide rail 4a,
There is a problem in that it is difficult to match the widths of the lead frame 4b and the lead frame 9, and the lead frame is not conveyed accurately.

The present invention has been made in view of the above points, and an object of the present invention is to provide an inexpensive and highly accurate lead frame conveying method and apparatus.

[Failure to solve the problem]

In order to achieve such an object, the present invention provides a lead frame conveying method in which the vertical planes of guide rails are brought into contact with both ends of the lead frame in the width direction to guide the conveyance of the lead frame. When the width is changed, the lift of the cam is changed in the width direction of the lead frame by external operation, and the guide rail is moved in the width direction via a cam follower member that is in contact with the cam surface of the cam. It was adopted.

In addition, in a lead frame transfer device equipped with a pair of guide rails that are supported on the machine side and guide the conveyed lead frame in the width direction with their vertical planes facing each other, each guide rail is supported so as to be movable in the width direction of the lead frame. At the same time, a cam follower member supported by each guide rail, and a cam that brings these cam follower members into contact with the cam surface and changes the lift of the cam surface in the width direction of the lead frame by external operation. Established.

[For production]

When the lead frame is moved using a conveyor such as a heald,
The lead frame is conveyed while being guided by guide rails on both ends in the width direction. When the width of the lead frame is changed, when the cam lift is changed in the width direction of the lead frame by external operation, the guide rail moves to the lead frame via the cam follower member that is in contact with the cam surface of the cam. move in the width direction of the lead frame to accommodate changes in lead frame dimensions.

〔Example〕

1 and 2 show an embodiment of the lead frame conveying device according to the present invention, which is shown to explain the lead frame conveying method according to the present invention, FIG. 1 is a perspective view thereof, and FIG. 2 is a vertical cross-section. It is a diagram. In these figures, members having the same configuration as those in FIG. 5 are given the same reference numerals, and detailed explanation thereof will be omitted, and will be briefly explained below. The lead frame conveying device 10 includes a pair of guide rails 4a and 4b supported by a linear guide device 3 at both ends of a base 2 so as to be movable toward and away from each other. It is configured to be guided and conveyed by 4a and 4b.

A cylindrical bearing holder 11 with a flange extending downward is fixed to the center of the base 2.
1 includes, for example, three upper and lower annular grooves 12a, 12b, 12.
A camshaft 12 equipped with a camshaft 12 is rotatably and vertically movably supported via a pair of upper and lower rotary linear motion bearings 13. At the upper end of the camshaft 12, there is a multistage cam 1 consisting of, for example, three stages of disc cams 14, 15, and 16 having different diameters.
7 are fixed at the same pitch as the annular grooves 12a, 12b, 12c, and disc cams 14, 15. A rolling bearing 1B as a cam following member selectively corresponding to one of the two is fixed with a pin. The cam surface of the small lift disk cam 14 is provided with a large diameter portion having the same diameter as the cam surface of the medium lift disk cam 15. is provided with a large diameter part having the same diameter as the cam surface of the disc cam 16 of the thick foot, and when the multistage cam 17 is moved up and down, it is moved up and down with this same diameter part so that there is no hindrance to the vertical movement. It is configured. A pole plunger 19 is screwed into a tapped hole in the bearing holder 11, and by moving the camshaft 12 up and down, the annular holes 12a, 12b, 12c are opened.
The camshaft 12 is configured to be fixed by selectively corresponding to any one of the following. 20 is a nut that fixes the pole plunger 19 in the tightened position.

Reference numeral 21 is a knob fixed to the lower end of the camshaft 12 and gripped when moving the camshaft 12 up and down, and 22 is a knob that is screwed into a threaded hole in the base 2 so as to be freely forward and backward, and whose tip is attached to the guide rail 2a. , 2b in contact with the guide rails 2a, 2b.
This is a fixing screw with a knob that fixes b in the moving position.

Further, between the guide rail 4a and the guide rail 4b, there is a pair of tension springs 2 that pull the rails together and press the rolling bearing 18 against the cam surface of the multistage cam 17.
3 is hung.

The operation of the lead frame conveying device 10 configured in this way will be explained. The lead frame 9 is connected to the guide rail 4a.
, 4b, and is conveyed in the direction of the arrow in FIG. 1 by a belt (not shown) provided between the guide rails 4a, 4b.

If the dimensions of lead frame 9 change, fixing screw 2
2 to make the guide rails 4a and 4b movable, and loosen the nut 20 and the pole plunger 19 to move the camshaft 1.
2 to be able to move up and down, grip the knob 21 and move the camshaft 12 up and down, so that the roller bearing 18 moves up and down the multistage cam 17.
Tighten the pole plunger 19 at a position corresponding to a desired one of the disc cams 14, 15, and 16 that make up the cam, engage the pole at the tip of the plunger into the annular groove 12a (12b, 12c), and tighten the nut 20. Fix it. When the multi-stage cam 17 is moved up and down, there is no problem in the up and down movement if the upper and lower cams are moved up and down at a position where the diameter is the same. By moving the multistage cam 17 up and down in this way, the guide rails 4a, 4
The rolling bearing 18 at the lower end of b is pressed against the desired disc cam by the tensile force of the tension spring 23, so when the fixing screws 22 are tightened, the guide rails 4a and -4b are fixed to the base 2 and adjustment work is completed. is completed.

3 and 4 show other embodiments of the present invention;
The figure is a perspective view of the conveyance device, and FIG. 4 is a longitudinal sectional view of the main part. In the drawings, members having the same configuration as those in the embodiment described above are given the same reference numerals, and their explanations will be omitted. In the lead frame transport device 30 of this embodiment, a guide rail 4a is provided at the center of the base 2.

4b is provided with an elongated hole 2a extending in the longitudinal direction, and the upper end screw portion 31a of the knob-equipped fixing screw 31 is slidably inserted into the elongated hole 2a from below. It is screwed into a 32-hole. The stair cam 32 is formed into a triangular plate shape, and has a plurality of four stair-shaped parts formed on its outer cam surface 32a, and guide frames 4a and 4b on both sides. A pawl 33 as a cam follower member that contacts the cam surface 32a is provided to protrude downward. 34 is stair cam 3
The cam holder is formed in a 7-shape to face the cam surface of 2, and a pin part 34a protruding from the top thereof is inserted into the elongated hole 2a. A compression coil spring 36 is interposed on the spring shaft 35 which is protruded from the spring shaft 35 and whose tip is inserted into the hole of the triangular cam 32. 37 is the cam holder 3 in a state where the cam holder 34 is pushed toward the stair cam 32 side against the elastic force of the compression coil spring 36.
4 to the stair cam 32, so that the ball 33 is held between the cam retainer 34 and the stair cam 32.

With the above structure, the lead frame 9 is guided by the guide rails 4a and 4b, and is conveyed by a belt (not shown) provided between the guide rails 4a and 4b.

If the dimensions of the lead frame 9 change, the fixing member 3
7, the cam retainer 34 is released from being fixed to the stair cam 32, and moves in the square direction of the guide rails 4a and 4b due to the elastic force of the compression coil spring 36, leaving the ball 33 and moving the guide rail 4.
Now that a and 4b are movable, expand them to their maximum width. Next, when the fixing screw 31 is loosened, the stair cam 32 becomes movable along the elongated hole 2a, so move the stair cam 32 until the pole 33 corresponds to the desired staircase on the cam surface 32a, and then loosen the fixing screw 31. Tighten and attach the stair cam 32 to the base 2.
Fixed to.

Therefore, after moving the guide rails 4a and 4b until the pawl 33 comes into contact with the cam surface 32a, the cam presser 34 is moved against the elastic force of the compression coil spring 36, so that the ball 33 contacts the cam surface 32a and the cam. When it is fixed to the stair cam 32 by the fixing member 37 while being held between the presser foot 34, the adjustment work is completed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, as a lead frame conveying method, the vertical planes of the guide rails are brought into contact with both ends in the width direction of the lead frame to guide the conveyance of the lead frame, and the width of the lead frame is When the lead frame is changed, the lift of the cam is changed in the width direction of the lead frame 2 by external operation, and the guide rail is moved in the width direction via a cam follower member that is in contact with the cam surface of the cam. In addition, in the lead frame conveying device, each guide rail is supported movably in the width direction of the lead frame, and cam follower members supported by each guide rail, and these cam follower members are connected to cams. By providing a cam that is in contact with the surface and whose lift on the cam surface can be changed in the width direction of the lead frame by external operation, the device can be provided at low cost without requiring a pulse motor as in the past. The positioning accuracy of the guide rail is high, and the conveyance accuracy of the lead frame is improved.

[Brief explanation of drawings]

1 to 4 show an embodiment of a lead frame conveying device according to the present invention, which is shown for explaining the lead frame conveying method according to the present invention, FIG. 1 is a perspective view thereof, and FIG. 2 is a vertical cross-section. 3 and 4 show other embodiments of the present invention, FIG. 3 is a perspective view of a beamed frame conveying device, and FIG.
The figure is a longitudinal sectional view of the main part, and FIG. 5 is a perspective view of a conventional lead frame conveying device. 2... Base, 4a 4b... Guide rail, 9... Lead frame, 10.30...
・Lead frame conveyance device, 17...Multi-stage cam, 1
8... Rolling bearing, 32... Stair cam, 33
···Pole.

Claims (2)

[Claims] (1) The vertical plane of the guide rail is brought into contact with both ends of the lead frame in the width direction to guide the conveyance of the lead frame, and the lift of the cam is changed in the width direction of the lead frame by external operation. A method for conveying a lead frame, characterized in that the width of the lead frame can be changed by moving a guide rail in the width direction via a cam follower member that contacts a cam surface of a cam. (2) In a lead frame transfer device equipped with a pair of guide rails that are supported on the machine side and guide the transfer lead frame in the width direction with their vertical planes facing each other, each of the guide rails is moved in the width direction of the lead frame. A cam following member supported by each of the guide rails is supported freely, and the cam following members are brought into contact with the cam surface and the lift of the cam surface is changed in the width direction of the lead frame by an external operation. A lead frame conveying device characterized by being provided with a cam.