JPH02121338A - Intermittent transfer device for lead frame - Google Patents

Abstract

PURPOSE:To perform reliably a pitchwise-feeding of a lead frame toward a transfer head by a method wherein the title device is constituted of a rotor, which is intermittently made to perform a reciprocating rotation, and clamping members, which are respectively coupled with both side parts of this rotor and pinch intermittently the lead frame from the vertical direction by the reciprocating rotation of this rotor. CONSTITUTION:When a motor M is rotated, a rotor 47 is pushed up by a plate 49 to rotate in a direction N3 and the edge parts of a lead frame LF are pinched by clamping members 59 and 60. Moreover, simultaneously with this, a rotator 14 is made to drive by the same motor M to rotate in a direction N1 around a rotating shaft 13 and a reciprocating element 16 is made to perform an advancing motion to the front against the spring force of a spring material 21 and performs a pitchwise- feeding of the lead frame LF pinched by the members 59 and 60 toward a transfer head H. When a chip (d) is bonded on a bonding place P by the head H, a cam 50 is further rotated, a state that the lead frame is pinched by the members 59 and 60 is released and moreover, the rotator 14 is rotated in the direction opposite to the direction N1, whereby the reciprocating element 16 is made to perform a return motion to the rear by the spring force of the spring material 21 and the members 59 and 60 are made to return to their original positions.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an intermittent conveyance device for lead frames, which clamps a lead frame with a clamp member and conveys the lead frame intermittently toward a transfer head. It was designed to do so.

(Prior Art) A lead frame is intermittently conveyed, and chips are bonded every predetermined pinch by a transfer head.

As a device for intermittently pitch-feeding a lead frame toward a transfer head in this manner, a device is known in which the edge of the lead frame is clamped by a clamping member and conveyed (Japanese Patent Laid-Open No. 61-287640). Publication No.)
.

(Problem to be Solved by the Invention) However, in the conventional device described above, the clamp member is driven by a cylinder to clamp the lead frame from above and below, so the tip position of the clamp member that clamps the lead frame, that is, the clamp position This causes a problem in that the posture of the lead frame in the clamped state is not constant, making it impossible to accurately feed the pitch.

Therefore, an object of the present invention is to provide a means for accurately pitch-feeding a lead frame.

(Means for Solving the Problems) For this purpose, the present invention provides a reciprocating element that is driven by a drive section and reciprocates intermittently in order to convey the lead frame directly below the transfer head, and A rotor that integrally reciprocates and is driven by a drive device to intermittently rotate reciprocatingly in synchronization with the reciprocating motion, and a rotor that is connected to both sides of the rotor and that is connected to both sides of the rotor so that the reciprocating rotation of the rotor causes the above-mentioned An intermittent conveyance device for a lead frame is constructed from clamp members that intermittently clamp the lead frame from above and below.

(Function) According to the above configuration, the clamp member intermittently clamps the lead frame from above and below in synchronization with the reciprocating movement of the reciprocating element,
To reliably pitch a lead frame toward a transfer head.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall perspective view of an intermittent conveyance device for a lead frame, and this conveyance device transfers the chips d attracted to the nozzle of the 7-do H to the bonding point P of the lead frame LF at a predetermined pitch. In order to perform bonding, the lead frame LF is intermittently pitch-fed directly below the transfer head H. M is a motor, and its rotation is transmitted via a timing belt 1 and a pulley 2 to a drive unit 3 for pitch-feeding the lead frame LF. Next, while referring to Figures 2 and 3,
The details of the drive unit 3 will be explained.

Reference numeral 4 denotes a drum-shaped cam driven by the pulley 2, which is housed in a box 5. The cam 4 has a guide rib 4a protruding from its peripheral surface. 6.6 is a cam follower that comes into contact with the guide rib 4a. The cam follower 6.6 is supported by a rotary plate 7, and a gear 10 is connected to a rotating shaft 8 of the rotary plate 7. When the cam 4 is rotated by being driven by the motor M, the cam follower 6.6 is guided by the guide rib 4a and rotates about the rotating shaft 8, and the gear 10 reciprocates in the direction of the arrow N1. 11 is gear 10
It is a gear driven by 180' and reciprocates 180'. 1
2 is a rotating body attached to the rotating shaft 13 of the gear 11, and a rotating element 14 is attached to the front surface of the rotating body. When the motor M is driven and the gear 11 rotates, the rotating element 14 is attached to the rotating shaft 13. 1
3 and rotates 1806 times in the direction of arrow N1 at a rotation radius R (see FIG. 3).

In FIG. 1, 16 is a long plate-shaped reciprocating element, 17 is a supporting member thereof, and a guide member 18 protruding from the back surface of the reciprocating element 16 is protruding from the front surface of the supporting member 17. It fits into the guide material 19. 21 is a spring member that urges the reciprocating member 16 toward the transfer head H; 22 is a retaining portion attached to the end of the reciprocating member 16; It is urged by a force and is brought into pressure contact with the rotor 14. Therefore, when the rotating element 14 reciprocates in the N1 direction as described above, the reciprocating element 16 is driven by the rotation of the rotating element 14, and is driven in the N2 direction, that is, in the lead frame LF.
It reciprocates in the transport direction. As will be described in detail later, the lead frame LF is intermittently pitch-fed toward the transfer head H by the reciprocating movement of the reciprocating element 16 while being held between the clamp members. Reference numeral 25 denotes a position adjustment device for the rotor 14 for steplessly adjusting the feed pitch, and its details will be explained next.

In FIG. 2, reference numeral 26 denotes a frame attached to the end of the rotating body 12, and this frame 26 includes the rotating body 12.
A feed screw 27 disposed inside 2 is attached.

A feed nut 28 is screwed so as to be movable along the feed screw 27, and the rotor 14 is attached to the feed nut 28. 29 is an engager attached to the end of the feed screw 27. 30 is a motor for driving the feed screw 27, and is mounted on the support member 31. This support member 31 is supported by the frame 34 via guide members 32 and 33 so as to be slidable in the lateral direction. 35 is frame 3
4, and is connected to its front support member 31. A pin 36 is provided protruding from the front surface of the motor 3° (see also FIG. 4), and a hole 37 into which the pin 36 is inserted is formed in the retainer 29.

Reference numeral 38 denotes a brake shoe of the engaging element 29 which is pivotally attached to the frame 26, 39 a spring member for press-contacting the brake shoe 38 to the retainer 29, and 38a a lever 40 protruding from the brake shoe 38, which is attached to the front surface of the motor M. This is a second protruding pin. Next, the operation of the adjustment device 25 will be explained.

When the air cylinder 35 is driven, the motor 30 moves forward guided by the guide members 32 and 33, the pin 36 fits into the hole 37, and the second pin 40 presses the lever 38a to hold the brake shoe 38. Separate from Goko 29 (
(See the chain line in Figure 4). When the motor 30 rotates in this state, the feed screw 27 rotates, the rotor 14 attached to the feed nut 28 slides along the feed screw 27, and the rotation shaft 13
The rotation radius R of the rotator 14 about the center is adjusted. When the adjustment is completed, the air cylinder 35 is driven again to move the motor 30 backward, the bottle 36 is removed from the hole 37, and the pressure on the lever 38a by the second bottle 40 is released, and the brake shoe 38 is moved to the retainer. 29 pressure contact.

By adjusting the rotation radius R of the rotator 14 in this manner, the reciprocating pitch L (see FIG. 3) of the reciprocating element 16, that is, the feed pinch of the lead frame LF can be adjusted steplessly.

Of course, a handle may be provided in place of the motor 30 and the feed screw 27 may be rotated to adjust the position of the rotator 14 by manually operating the handle. In particular, this device rotates the cam 4 at a constant speed and rotates the rotor 14 reciprocatingly by 180 degrees per rotation, thereby causing the reciprocating element 16 to reciprocate once. This does not change even if the dynamic radius R is changed, and this means that the lead frame L can be freely and accurately controlled while making use of the cam curve of the guide rib 4a without controlling the rotation of the cam 4.
This means that the feed pinch of F can be changed. Next, the clamping means for the lead frame LF will be explained with reference to FIGS. 1, 5, and 6.

Spline shafts 41 and 42 are provided at both ends of the reciprocating element I6.
passes through the spline shaft 41 and the spline shaft 42.
The rear end portions are connected via a lever 4344 and a mouth/throat 45.

Reference numerals 46 and 47 denote a lever and rotor attached to the end of one spline shaft 41, and a roller 48 is pivotally attached to the lower end of the lever 46.

Reference numeral 49 is a ground plate of the roller 48, and a cam 50 and a cam follower 51 are disposed below the ground plate, and these members 46 to 51 constitute a clamp driving means for a clamp member 59, 60 (described later). ing. 54 is a guide rod that guides the elevation of the plate 49. In FIG. 1, reference numeral 9 denotes a pulley coaxial with the pulley 2, and its rotation is transmitted to the rotating shaft 55 of the cam 50 via the timing belts 23, 24. In this way, this cam 50 is driven by the same motor M that drives the reciprocating element 16.

The rotor 47 has its central portion attached to the spline shaft 41 and is connected to the reciprocating element 16.
It reciprocates integrally with G.

Further, rollers 56, 56 are pivotally attached to both sides of the rotor 47 (see FIG. 6), and these rollers 56, 56 slide along the upper and lower surfaces of the guide plate 57. Further, a clamp member 59 is pivotally attached to the upper roller 56 via a plate 58 with a pin 64, and a clamp member 60 is also attached to the lower roller 56.

61 is a spring member that urges the clamp member 59 downward. 62.63 is a support material for lead frame LF,
It is disposed at the same level as the conveyor 72 for conveying the lead frame LF, and temporarily supports the lead frame LF which has been released from the clamped state by the clamp members 59 and 60.

In the above configuration, when the cam 50 rotates, the plate 4
9 is pushed up by the cam follower 51 and moves up and down. The rotor 47 then rotates around the spline shaft 41 in the direction of the arrow N3 (see Fig. 6), and the upper and lower pair of clamp members 59 and 60 clamp the edge of the lead frame LF from above and below. In this state, the reciprocating element 16 slides back and forth in the direction of the arrow N20,000 as described above, so that the lead frame LF is intermittently conveyed toward the transport lid H. Of course, when the reciprocating element 16 retreats, the cam 50 rotates further, the plate 49 descends, the rotor 47 rotates in the opposite direction, and the clamp member 5'9.60 maintains the clamped state of the lead frame LF. unlock. In this way, the clamp driving means 46 to 51 are configured such that the clamp members 59.60 transport the lead frames I, F toward the transfer head H (when moving forward, the plate 49 is pushed up and the clamp members 59.60 When clamping the lead frame LF and moving the clamp members 59 and 60 back, the clamping state should be released (and the plate 49 should be lowered).

In other words, the clamp driving means 46 to 51 move the reciprocating element 16
In synchronization with the reciprocation of the lead frame LF, the clamp members 59 and 60 are driven to intermittently clamp the lead frame LF. Also, the reciprocating element 1 that pitch-feeds the lead frame LF
6 and the cam 50 for driving the clamp members 59 and 60 that clamp the lead frame LF at that time are driven by the same motor M.
Since the pinch feeding and clamping operations are driven by the pinch feeding and clamping operations, it is possible to accurately synchronize the pinch feeding and clamping operations. Next, support material 62.6 due to change in width of lead frame LF.
The third position adjustment means will be explained.

In FIG. 1, reference numerals 65 and 66 are support stands for support members 62 and 63, which are slidably installed on a guide member 67. 68 and 69 are feeders passing through both ends of this support member 62 and 63, 70 is a nut, and one support base 65
are screwed into right-handed threads 513a and 69a, and the other support base 66 is screwed into left-hand threads 68b and 69b. Reference numeral 71 is a motor that drives the feeders 68 and 69.

72 is a timing belt. Therefore, motor 7
1, the supports 65 and 66 slide in the N4 direction, and the spacing between the supports 62 and 63 can be adjusted in response to changes in the lateral and medium dimensions of the lead frame LF.

This lead frame intermittent conveyance device has the above-mentioned structure, and the overall operation will be briefly explained next.

When the motor M rotates, the rotor 47 is pushed up by the plate 49 and rotates in the N3 direction, and the edge of the lead frame LF is clamped by the clamp members 59 and 60 (Fig. 5,
(See the dashed line in Figure 6).

At the same time, the rotor 14 is driven by the same motor M to rotate in the N1 direction about the rotating shaft 13, and the reciprocating element 1
6 moves forward (to the right in FIG. 1) against the spring force of the spring member 21, pitch-feeding the lead frame LF held between the clamp members 59 and 60 toward the transfer head H. When the chip d is bonded to the bonding point P by the transfer head H, the cam 50 further rotates, the clamping state by the clamp parts 59 and 60 is released, and the rotor 14 rotates in the opposite direction. As a result, the reciprocating element 16 moves backward by the spring force of the spring material 21, and the clamp members 59 and 60 return to their original positions. By repeating the above operations, the lead frame LF is intermittently pitch-fed toward the transfer head H, and the chips d are bonded to the bonding point P one after another.

(Effects of the Invention) As explained above, the present invention provides a reciprocating element that is driven by a drive section and moves back and forth intermittently in order to convey the lead frame directly below the transfer head, and a reciprocating element that is integrated with the reciprocating element. a rotor that reciprocates and rotates intermittently in synchronization with the reciprocating motion when driven by a drive device; The lead frame intermittent conveying device is composed of a clamp member that intermittently clamps the lead frame from above and below, so that the clamp member intermittently clamps the lead frame from above and below in synchronization with the reciprocating movement of the reciprocating element. The lead frame can be reliably pitched toward the transfer head.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of an intermittent conveyance device for lead frames, Fig. 2 is a perspective view of the drive section, Fig. 3 is a plan view of the same, and Fig. 4 is FIG. 5 is a partial front view of the pitch adjustment device. FIG. 6 is a side view and a partial front view of the clamp mechanism. 3... Drive unit 16... Reciprocating elements 46-51... Drive device 47... Rotor 59.60... Clamp member LF... Lead frame H... Transfer head

Claims (1)

[Claims] In order to convey the lead frame directly below the transfer head, there is a reciprocating element that is driven by a drive unit and reciprocates intermittently, and a reciprocating element that reciprocates integrally with this reciprocating element and is driven by a drive device to perform the reciprocating movement. A rotor that intermittently rotates back and forth in synchronization with the motion,
An intermittent conveyance device for a lead frame, comprising clamp members connected to both sides of the rotor to intermittently clamp the lead frame from above and below by reciprocating rotation of the rotor.