JPS63325B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed-dimension feeding mechanism for thin plates used in wire bonders, die bonders, etc.

A conventional thin plate sizing feeding mechanism has a structure as shown in FIG. That is, a camshaft 2 is rotatably supported on the frame 1, and the camshaft 2
A cam 3 for vertically moving the feed pin is fixed to.
The feed shaft holder 4 is biased by a spring 7 so that a cam follower 6 rotatably supported by a shaft 5 fixed to the lower surface of the feed shaft holder 4 comes into contact with the cam 3 for vertically moving the feed pin. A guide shaft 8 is fixed to the lower surface of the feed shaft holder 4, and this guide shaft 8 is fitted into a bearing 9 fixed to the frame 1 so as to be slidable in the vertical direction.

Further, a feed shaft 10 is slidably fitted into the feed shaft holder 4, and a plurality of (three in this embodiment) feed arm mounting blocks 1 are mounted on the feed shaft 10.
1A, 11B, and 11C are fixed. A feed arm 13 having a feed pin 12 fixed to one end is fixed to the upper surface of the feed arm mounting blocks 11A, 11B, and 11C with screws 14, respectively. The feed pin 12 is arranged above a lead frame (thin plate) 16 placed on a guide rail 15. A stopper screw 17 is disposed opposite the feed arm mounting block 11B, and the stopper screw 17 is screwed into a stopper screw support block 18 fixed to the frame 1.

Further, a feed pin horizontal movement cam 20 is fixed to the camshaft 2. Feed pin horizontal movement cam 2
A feed lever 22 that swings around a support shaft 21 is disposed between the feed arm mounting block 11A and the feed arm mounting block 11A. the feed lever spring 24 so that it abuts
is energized by A roller 25 is rotatably provided at the other end of the feed lever 22, and the feed lever 22 is connected to a spring-loaded shaft 26 fixed to the feed shaft 10 so that the feed arm mounting block 11A comes into contact with the roller 25. A feed spring 27 is applied.

Therefore, when the camshaft 2 is rotated by a drive mechanism (not shown), the feed shaft 10 is first lowered together with the feed shaft holder 4 via the cam follower 6 and the shaft 5 according to the profile of the cam 3 for vertical movement of the feed pin. As a result, the feed pin 12 descends in the direction of arrow A, and the feed pin 12 is inserted into the groove of the lead frame 16. Next, the feed lever 22 rotates counterclockwise around the support shaft 21 according to the profile of the feed pin horizontal movement cam 20, and the feed arm mounting block 11A moves in the direction of arrow B via the roller 25, causing the feed The shaft 10 slides within the feed shaft holder 4 and stops when the feed arm mounting block 11B abuts against the stopper screw 17. As a result, the feed pin 12 moves in the direction of arrow B and feeds the lead frame 16 by a certain pitch. Next, the cam follower 6 is raised by the pin vertical movement cam 3, and the feed pin 12 is raised in the direction of arrow C, contrary to the above, and the feed pin 1
2 comes out from the groove of the lead frame 16. Subsequently, the feed lever 2 is moved by the feed pin horizontal movement cam 20.
2 rotates clockwise in the opposite direction to the above, and the feed pin 12
moves in the direction of arrow D and returns to its original position. This completes one cycle.

However, in such a mechanism, as described above, the feed arm mounting block 11B comes into contact with the stopper screw 17 to determine the feed stroke of the feed pin 12, and the movement of the feed pin 12 in the B direction is stopped. Also, at this time, a slight gap is created between the feed pin horizontal movement cam 20 and the cam follower 23. Therefore, an impact occurs when the feed arm mounting block 11B hits the stopper screw 17, and an impact occurs when the cam follower 23 hits the feed pin horizontal movement cam 20 to move the feed pin 12 in the direction of arrow D.
Since the lead frame 2 vibrates, the accuracy of the feed position of the lead frame 16 is poor, and high speed cannot be achieved, resulting in poor productivity.

In addition, in order to adjust the horizontal position where the feed pin 12 descends in the A direction and is inserted into the groove of the lead frame 16 before starting, loosen the screw 14 and shift the position of the feed arm 13, or The mounting position of the dynamic cam 20 must be shifted. Generally, a plurality of feed pins 12 are provided, so the former method of shifting the position of the feed arm 13 requires adjusting the spacing between the feed pins 12 at the same time, which requires a large amount of adjustment time. Furthermore, the latter method of shifting the mounting position of the feed pin horizontal movement cam 20 has the disadvantage that fine adjustment of the position is extremely difficult and the cam timing is distorted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a thin plate sizing mechanism that eliminates the above-mentioned drawbacks.

An embodiment of the present invention will be described below with reference to FIG. The mechanism for vertically moving the feed pin 12 is the same as that shown in FIG. 1, so the same or equivalent members as in FIG. 1 will be described with the same reference numerals. A camshaft 2 is rotatably supported on the frame 1, and a cam 3 for vertically moving the feed pin is fixed to the camshaft 2. The feed shaft holder 4 is biased by a spring 7 so that a cam follower 6 rotatably supported by a shaft 5 fixed to the lower surface of the feed shaft holder 4 comes into contact with the cam 3 for vertically moving the feed pin. A guide shaft 8 is fixed to the lower surface of the feed shaft holder 4, and this guide shaft 8 is fitted into a bearing 9 fixed to the frame 1 so as to be slidable in the vertical direction. A feed shaft 10 is slidably fitted into the feed shaft holder 4, and a plurality of (three in this embodiment) feed arm mounting blocks 11A, 11B, 11C are fixed to the feed shaft 10. There is. Feed arm mounting block 11A, 11
A feed arm 13 having a feed pin 12 fixed to one end is fixed to the upper surface of B and 11C with screws 14, respectively. The feed pin 12 is arranged above a lead frame (thin plate) 16 placed on a guide rail 15. The above configuration is the same as that in FIG.

Next, the configuration of the horizontal movement mechanism of the feed pin 12 will be explained. A camshaft 30 driven by a drive mechanism (not shown) is rotatably supported on the frame 1 at right angles to the camshaft 2, and a feed pin horizontal movement cam 31 is fixed to the camshaft 30. A cam follower 34 rotatably attached to one end of an L-shaped feed lever 33 that swings around a support shaft 32 rotatably supported on the frame 1 corresponds to the feed pin horizontal movement cam 31. The feed lever 33 is biased by a spring 35 so that it comes into contact with the feed pin horizontal movement cam 31. Feed lever 33
A connecting lever 36 rotatably supported on a support shaft 32 is connected to a horizontally elongated hole 33a formed in the feed lever 33.
It is fixed with a fixing screw 37 through it. Further, a vertically elongated hole 33b is formed in the feed lever 33.
Eccentric pin 38 having an eccentric amount a in this elongated hole 33b
One shaft part of the eccentric pin 3 is rotatably inserted into the eccentric pin 3.
The other shaft portion of 8 is rotatably fitted into the connecting lever 36.

The upper side of the connecting lever 36 is formed into a trapezoidal shape as shown in FIG. 3, and the adjusting lever 40 is slidably fitted into this portion. And adjustment lever 4
The adjustment lever 40 is fixed to the connection lever 36 by a fixing screw 41 that is installed through a long hole 40a formed in the center. Further, an adjustment screw 42 is attached to the top of the adjustment lever 40 to be screwed into the top of the connection lever 36, and a spring 43 is disposed between the tops of the adjustment lever 40 and the connection lever 36. 42 and also serves to remove looseness of the adjustment screw 42. Further, the adjustment lever 40 is rotatably provided with a roller 44 corresponding to the feed arm mounting block 11A.
A feed spring 45 is hung between the connecting lever 36 and the feed arm mounting block 11B so that the feed spring 1A is in contact with the connecting lever 36 and the feed arm mounting block 11B.

Next, the operation of the present invention having such a configuration will be explained. When the camshaft 2 is rotated by a drive mechanism (not shown), the cam follower 6, shaft 5, feed shaft holder 4, feed shaft 10, feed arm mounting blocks 11A to 11C, and feed are rotated according to the profile of the cam 3 for vertically moving the feed pin. The feed pin 12 is moved up and down in the directions of arrows A and C via the arm 13 as in the case of FIG. Further, when the camshaft 30 is rotated by a drive mechanism (not shown), the feed lever 33 is swung around the support shaft 32 according to the profile of the feed pin horizontal movement cam 31, and the connection lever 36, adjustment lever 40, Feed arm mounting block 11A via roller 44
is moved. As a result, the feed shaft 10 slides within the feed shaft holder 4, and the feed pin 12 is horizontally moved in the directions of arrows B and D. That is, by the combination of the vertical movement in the directions of arrows A and C and the horizontal movement in the directions of arrows B and D, the feed pin 12 is moved as shown in the arrows A, B, C, and D, and the lead frame 16 is moved one pitch. be done.

By the way, in this mechanism, the stroke of the feed pin 12 is adjusted by loosening the fixing screw 41 and turning the adjusting screw 42. When the adjustment screw 42 is turned, the adjustment lever 40 moves up and down, moving the roller 44 from the support shaft 32.
This changes the dimension l up to the feed pin 1.
2 strokes can be adjusted. After adjustment, the fixing screw 41 is tightened to fix the adjusting lever 40 to the connecting lever 36.

Since the stroke of the feed pin 12 is adjusted by changing the lever ratio in this way, there is no need to hit the stopper screw 17 (see Figure 1) as in the conventional case.
No vibration or shock occurs. Further, since the profile of the feed pin horizontal movement cam 30 is used to the end, no vibration or impact occurs at this point. Therefore, pitch feeding can be performed at high speed and with high precision.

Further, the position of the feed pin 12 is adjusted by loosening the fixing screw 37 and turning the eccentric pin 38. Eccentric pin 38
When turned, the connecting lever 36 swings about the support shaft 32 in the direction of arrow E, so the horizontal position of the roller 44 changes, thereby changing the horizontal position of the feed arm mounting block 11A. Since the feed arm mounting blocks 11A, 11B, and 11C are fixed to the feed shaft 10, all the feed pins 12
, that is, the horizontal position where the feed pin 12 is lowered in the A direction and inserted into the groove of the lead frame 16 is adjusted at the same time.

Since the adjustment can be made simply by swinging the connection lever 36 in this way, it can be done more easily and in a shorter time than in the past. Moreover, even if the number of feed pins 12 is large, the positional relationship between them can be maintained without shifting.

In the above embodiment, the feed pin horizontal movement cam 31 was attached to the camshaft 2 and the separate camshaft 30 to which the feed pin vertical movement cam 3 was attached. It may be fixed.

As is clear from the above description, according to the present invention, it is easy to adjust the stroke and position of the feed pin, and high-speed operation is possible without vibration or shock.

[Brief explanation of the drawing]

1 shows a conventional example, a is a front view, b is a partial side view, FIG. 2 is an embodiment of the present invention, a is a front view, b is a partial side view, and FIG. F in diagram a
-F line sectional view. 3... Cam for vertical movement of the feed pin, 4... Feed shaft holder, 5... Shaft, 6... Cam follower, 8...
Guide shaft, 9...Slide bush, 10...Feed shaft, 11A to 11C...Feed arm mounting block, 12...Feed pin, 13...Feed arm, 1
6... Lead frame (thin plate), 31... Feed pin horizontal movement cam, 33... Feed lever, 34...
Cam follower, 36...Connection lever, 37...Fixing screw, 38...Eccentric pin, 40...Adjustment lever, 41...Fixing screw, 42...Adjustment screw, 44
……roller.

Claims (1)

[Claims] 1. In a thin plate sizing feeding mechanism that is composed of a feed pin vertical movement mechanism that moves the feed pin up and down and a feed pin horizontal movement mechanism that moves the feed pin horizontally, the thin plate sizing feeding mechanism that transfers the thin plate at a constant pitch by the feed pin, the feed pin horizontal The moving mechanism includes a horizontally moving feed pin cam that is rotationally driven, a feed lever that is swung by the cam for horizontally moving the feed pin, a connecting lever that is fixed to the feed lever so that its swing can be adjusted, and the feed pin horizontally moving cam that is rotationally driven. A thin plate sizing feeding mechanism comprising an adjustment lever that has an actuator that horizontally moves a pin and is fixed to the connection lever so as to be vertically adjustable.