CN1315153C

CN1315153C - Die Bonder Lead Frame Feeding Space Cam Mechanism Combination Device

Info

Publication number: CN1315153C
Application number: CNB2003101125773A
Authority: CN
Inventors: 李克天; 吴小洪; 王晓初; 陈新; 温兆麟
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2003-12-16
Filing date: 2003-12-16
Publication date: 2007-05-09
Anticipated expiration: 2023-12-16
Also published as: CN1630465A

Abstract

The present invention discloses a spatial cam mechanism assembled apparatus for feeding lead frames of a sticking machine. The configuration base line of a spatial cam is formed by intersecting two space slopes so as to provide the desired driving force for followers on the XY plane and Z direction. The spatial cam rotates in a unidirectional mode under the drive of a step motor and experiences the processes of starting, accelerating, uniform speed, deceleration, stopping, etc. orderly in a circle. All movements for driving the feeding of the lead frames are finished through a rolling bearing, a wrist bracket, a driven arm, a polish rod driving actuator and a pawn claw. All required movements in the feeding and sending process of the lead frames of the sticking machine can be realized by one motor and one spatial cam. As long as the cams are changed, different manufacturing technique requirement can be satisfied. The present invention has simple structure and convenient adjustment.

Description

Die Bonder Lead Wire Frame Supply Space Cam Mechanism Unit Equipment

Technical field

The present invention relates to a kind of material straight line batch (-type) feed mechanism of IC chip die Bonder, relate in particular to Die Bonder Lead Wire Frame Supply Space Cam Mechanism Unit Equipment.

Background technology

Lead frame must just can be finished weldbonding with the IC chip through step feeding feed process on die Bonder, batch (-type) feeding feed commonly used is at present implemented by dual mode, a kind of is to drive accurate ball wire bar pair by servomotor straight reciprocating motion is provided, simultaneously on parts moving linearly, drive the retaining part that colludes the pawl insertion and withdraw from lead frame, the feeding requirement that the action of servomotor and electromagnet cooperatively interacts and can finish lead frame by electromagnet.Second method is by two disc cams of a driven by motor, the straight reciprocating motion that pawl is colluded in cam control, and the space upset of another cam control ditch pawl realizes inserting and withdrawing from the lead frame retaining part.Though these two kinds of methods can both realize the feed of wire clamp, the former has burst characteristic at the action of electromagnet, so impact big; The action of electromagnet and servomotor is wanted strict and is coordinated, and makes control get up to have certain complexity; Ball wire bar pair can change rotatablely moving of servomotor into rectilinear motion, but has adopted ball wire bar pair to make mechanism's complexity and cost increase.The latter interferes with each other to make for fear of rectilinear motion and space flip-flop movement and occurs sliding friction between the kinematic pair, additionally adopt the complicated mechanisms such as linear bearing of a cover, and so part is many, complex structure is adjusted inconvenience.

Summary of the invention

In order to overcome the shortcomings such as complex structure of existing two kinds of lead frame feed mechanisms, the invention provides a kind of spatial cam composite set, not only can finish the function of lead frame feed, and also simple in structure, number of parts is few, reliable in action.

The technical scheme that technical solution problem of the present invention is adopted is: drive space cam by stepping motor, space cam drives actuator by rolling bearing, wrist support, slave arm, optical axis again and colludes the pawl action, above-mentioned slave arm one end connects with the wrist support, the other end is fixed on the polished rod, polished rod connects and colludes pawl mechanism, polished rod is with being equipped with linear bearing between the frame, polished rod not only can back and forth rotate but also can move back and forth; Collude pawl in the rule action of XY plane and Z direction, collude retaining part that pawl inserts lead frame in the air, promote the lead frame straight-line feed, make to move behind lead frame lateral register, the trace and disengage, return the locus with lead frame and do the displacement of straight line return at last in the space and finish the primary feed action and get ready for feeding next time by the contour curve of space cam.

Above-mentioned space cam profile baseline forms by inclined-plane, two spaces is crossing, two rolling bearings on the wrist support under the effect of spring respectively with the contact of the inclined-plane of profile baseline both sides, rotate according to space cam, two inclined-planes transmit the action of XY plane and Z direction to rolling bearing.

Above-mentioned wrist support is with a revolute pair is housed between the slave arm, and according to the space cam radius change, the wrist support that ball bearing is housed is done corresponding rotation with the change of the slope tangent line of ball bearing and space cam contact position.

The invention has the beneficial effects as follows, can realize desired whole actions in the die Bonder lead frame feed process, just can satisfy different manufacturing technique requirents as long as change cam with a motor and a space cam.Simple in structure, easy to adjust.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the structure principle chart of space cam feed mechanism combination.

Fig. 2 is the xz schematic cross-section of space cam and driven member.

Fig. 3 is a wrist support rotation schematic diagram.

1. stepping motors among the figure; 2. space cam; 3. frame; 4. rolling bearing; 5. optical axis; 6. slave arm; 7. collude pawl; 8. linear bearing; 9. lead frame; 10. wrist support; 11. track; 12. revolute pair; 13 profile baselines; The R cam radius; θ wrist support corner

Embodiment

As shown in Figure 1, the profile baseline of space cam 2 makes that at the projected outline such as the same disc cam on XY plane 6 of slave arms that cooperate with it can be on the XY plane by the movement locus swing of design; The profile baseline of space cam is designed to change along profile in the size of Z direction, thereby makes the slave arm that cooperates with it again can be in the Z-direction reciprocating motion.

In order to make slave arm in XY plane and Z direction, i.e. motion in the spatial dimension is effective, and the section of outline of space cam and the structure of slave unit are designed to as shown in Figure 2.Two side profile of profile baseline 13 are the inclined-plane among the figure, two rolling bearings 4 are installed in respectively on two branch yokes of wrist support, under the effect of spring force (the figure medi-spring does not draw), with two inclined-plane contacts of cam, bearing can roll during cam rotation respectively in the outer ring of bearing.From Fig. 2 cross section, when cam rotates, if two inclined-planes past+the x direction develops, moves to right thereby right tilted surface promotes to drive slave arm from the bearing on the right; Otherwise, if two inclined-planes past-the x direction develops, drive slave arm and move to left thereby left tilted surface promotes left bearing; If two inclined-planes develop toward the z direction, then two inclined-plane actings in conjunction promote slave arm in the displacement of z direction.

Because space cam is actually disc cam on the xy plane, the radius R of cam contour baseline changes, as shown in Figure 3.Do not produce any slip in order also can accurately with the inclined-plane of cam to contact at two rolling bearings in the interval of radius change, the revolute pair 12 among Fig. 2 can allow the wrist support to do the reciprocal rotation of trace flexibly around the axle center of oneself.When the θ among Fig. 3 was shown position, the wrist support rotated the corner that forms, that is the profile slope variation angle of rolling bearing and cam contact position.

As seen from Figure 1, under the effect of space cam, slave arm can drive the reciprocating motion that polished rod both can have been made the Z direction, also can do around the polished rod axle center back and forth to rotate.In the frame 3 of support polished rod linear bearing 8 is housed, can guarantees fricton-tight friction.Therefore collude pawl 7 one ends and be fixed on the polished rod, can realize moving by motion requirements of space cam design and stir lead frame 9 and finish feeding, action such as locate, return with polished rod.

Claims

1. A lead frame feed space cam mechanism combination device of a chip bonder, characterized in that: the stepping motor drives the space cam to rotate, the space cam drives the rolling bearing installed on the wrist support, and one end of the slave arm is connected with the wrist support. The other end is fixed on the optical axis, and the two ends of the optical axis are supported by linear bearings installed in the frame. The optical axis can be reciprocated and moved; the hook is fixed on the optical axis, and the hook follows the contour of the space cam. The law of the curve rotates in the XY plane perpendicular to the optical axis and reciprocates in the Z direction perpendicular to the XY plane, and the hook claw is inserted into the clamping part of the lead frame in the air to push the lead frame to feed in a straight line.

2. The combination device of the die bonder lead frame feeding space cam mechanism according to claim 1, characterized in that: the above-mentioned space cam profile base line is formed by the intersection of two space inclined planes, and the two rolling bearings on the wrist support are under the action of the spring They are in contact with the slopes on both sides of the baseline of the space cam profile respectively, and rotate according to the space cam, and the two slopes transmit the movements of the XY plane and the Z direction to the rolling bearing.

3. The lead frame feeding space cam mechanism combination device of the chip bonder according to claim 1, characterized in that: a rotating pair is installed between the above-mentioned wrist support and the driven arm, which changes according to the radius of the space cam, and is equipped with a ball The wrist support of the bearing rotates accordingly with the change of the slope tangent at the contact point between the ball bearing and the space cam.