JPS5913337A - Intermittent feeder for lead frame - Google Patents

Abstract

PURPOSE:To execute the intermittent feed-operation of the lead frame at different pitches of two kinds or more selectively by detachably setting up a differential cam member for converting horizontal feed-pitches to the intermittent feeder for the lead frame molded for the base of a semiconductor (a discrete IC). CONSTITUTION:A pair of lifting levers 3, 21 elevating and dropping by a pair of vertically movable cams 9, 25 are axially set up vertically to a substrate 1, and holding members 11, 26 are each installed to the upper sections of each lifting lever 3, 21. A feed lever 13 with a gathering pallet 12 is fitted and inserted to one holding member 11 so as to be energized forward and reciprocated and slid, a second feed lever with a cam following member 30 is fitted and inserted to the other holding member 26, and the differential cam member 29 for converting horizontal feed-pitches being in contact with said cam following member 30 is set up detachably to the end section of the feed lever 13. Accordingly, intermittent-feed of different strokes can be executed selectively because horizontal feed-operation is transmitted over the differential cam member 29 by a horizontal feed-cam member 10 through a rocking lever 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an intermittent feeding device 1 for a lead frame for molding the base of, for example, a semiconductor (discrete, ■, 0).

[Technical background of the invention]

In general, this type of lead frame has a long and thin substrate a with holes b at both ends spaced apart from each other by a constant pitch P, as shown in Fig. 1. For example, an electronic component O such as a diode is provided at each ear hole in the middle of the board a.The lead frame shown in FIG.
different pitch PL, a 8 ear holes are drilled, and,
On the substrate a, for example, a bed C base (at) on which an electronic component O such as an integrated circuit is pasted, and an arm rod (a) for connecting lead wires are formed.

On the other hand, as shown in FIG. 3, such a lead frame can be fed intermittently using an already proposed intermittent feeding device for lead frames, and subjected to a work process in which each of the above electronic components C can be pasted. , and can be transferred intermittently.

That is, FIG. 3 shows an intermittent feeder for a lead frame, and reference numeral 1 denotes a board that is integrated with the machine frame (not shown) of the intermittent feeder. A bearing 2 is provided upright, and an elevating rod 3 that moves up and down is vertically and slidably mounted on the bearing 2. A portion 3aK of the elevating rod 3 is connected to a bracket 5 having a cam roller 4. is located below the substrate 1 and attached thereto.

Further, a motor 6 is installed below the board 1,
The output shaft 6aK of the output shaft 6aK of the output shaft 6 is rotatably mounted on a rotary shaft 7 horizontally via a joint 8. Furthermore, the rotating shaft 7 on which the cam roller 4 is located has a cam 9 for upward and downward movement, such as a disc cam, mounted thereon, and the free end 7aK4''tII! of the rotating shaft 7 has a conical head shape. On the other hand, a holding member 11 having a bifurcated shape is fixed to the upper end 3bK of the lifting rod 3 by a bracket 12, and both bearings of this holding member 11 are fixed to the upper end 3bK of the lifting rod 3. A lead frame a is provided in the portion 11a.
Due to the elastic force of the coil spring 14, the feed rod 13 having the feed pawl 12 that feeds intermittently moves the
It is fitted so that it can slide back and forth while being biased towards. Also, between this holding member 11 and the substrate l? -1 coil spring 15 is hooked, and this coil spring 15 not only controls the upward movement of the lifting rod 31C, but also allows the cam roller 4 to roll into contact with the upward and downward movement cam 9. There is.

On the other hand, the free end 13alC of the feed rod j3 located directly above the horizontal feed cam member io is in contact with the abutting member 16, and the end face 16a4c of the abutting member 16 is supported by the machine frame at 17. One end 18a of the swinging stack 18 which is pivotally supported by the swinging stack 18 is in contact with the other end 18a of the swinging stack 18.
t1 is in pressure contact with the end face 10alc of the cam member 1o due to the elasticity of the coil spring 140. Therefore, the intermittent feeding device of the lead frame a described above is controlled by the output of the motor 6 by driving the motor 6. Since the rotating shaft 7, which is integral with the shaft 6a, rotates together with the upward/downward moving cam 9 made of a disc cam, this upward/downward moving cam 9 presses down the cam roller 4, so that it can be moved up and down in unison with the cam roller 4. As the rod 3 descends with the elasticity of the coil spring 15, the holding member ii of the lifting rod 3 also descends, so the feed rod I3 of the holding member 11 also descends together with the feed pawl 12, and the above-mentioned lead It engages with the ear hole of frame a.

On the other hand, a cam member lO for the horizontal feed pitch of the rotating shaft 7
Since the swinging stack 18 is rotated to the right around the support shaft 17, the contact member 16 that comes into contact with one end lea of the swinging stack 18
moves forward (to the right) by an amount equivalent to 1 pitch □ due to the elasticity of the coil spring 14, so the feed pawl 12 of the feed rod 13, which is integrated with the contact member 16, moves the lead frame a by 1
Osho Pituchi moves.

Next, the upper/lower moving cam 9 formed by the disc cam rotates,
When the elevating rod 3, which is integrated with the cam roller 4 and is in rolling contact therewith, is raised by the elasticity of the coil spring 15, the feed pawl 12 of the feed rod 13 is separated from the ear hole of the lead frame a.

On the other hand, since the horizontal feed cam member lO of the rotating shaft 7 rotates the swinging stack 18 to the left around the support shaft 17, the contact member 16V comes into contact with the other end of the swing stack 18! It moves backward (to the left) by the equivalent of one pitch against the elasticity of the coil fi14 and retreats.

In this manner, the feed claw 12 is configured to intermittently transfer the lead frame a one pitch at a time.

[Problems with background branching techniques]

However, although the above-mentioned lead frame intermittent feeding device does not cause any trouble to the intermittent feeding operation when the ear hole is formed by the lead frame a having a constant pitch P shown in FIG. As shown in FIG. 2, the ear holes of lead frame a have different pitches PL.
, Ps, it is difficult to perform one intermittent feeding operation using the above-mentioned lead frame intermittent feeding device as is.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and the present invention enables the intermittent feeding operation of two or more types of lead frames with different pitches to be performed selectively, and the intermittent feeding operation of the lead frames of different types. This book provides an intermittent feeding device for a fixed frame, which is designed to be applicable to other applications.

[Summary of the invention]

In the present invention, a pair of elevating rods that are moved up and down by a pair of upward and downward movement cams are vertically mounted on a board, a holding member is provided on the upper part of each of the elevating rods, and a feed claw is attached to one of the holding members. The feed rod is biased forward t2 so as to slide back and forth,
A second feed rod having a cam follower is fitted into the other holding member, a differential cam member for horizontal feed pitch conversion is removably provided at the end of the feed rod, and the differential cam member is oscillated. The horizontal feed motion can be transmitted by the horizontal feed cam member via the dynamic rod to obtain intermittent feed motion.

[Embodiments of the Invention] Below, the present invention will be described with reference to an illustrated embodiment, and the same components as those of the present invention will be described with the same reference numerals.

In FIG. 4, reference numeral 1 denotes a board that is integrated with the machine frame of the intermittent feeder, and this board IK has a second bearing that also serves as a guide, and is provided with a second bearing that also serves as a guide. A second lifting rod 21 that moves up and down is vertically slidably mounted on the lower part 21a of the second lifting rod 210.
A cam bracket (having a force and a roller n) 23 is attached to the substrate 1.
It is attached below the . Further, a motor 6 is installed below the board 1, and the output shaft 6aK of the motor 6 has a rotating shaft 7 horizontally connected to it via a joint 8.
It is mounted on a shaft so that it can rotate freely. Furthermore, the rotary shaft 7 on which the second cam roller n is located extends through a latch row such as a magnetic clutch, and furthermore, the rotary shaft 7 includes, for example, a disc. A second up/down movement cam 5 of the same shape, which is slightly smaller than the above-mentioned up/down movement cam 9 like a cam, is attached to the shaft, and the second up/down movement cam 25 of this rotary shaft 7 is similar to the above-mentioned one. It is adapted to come into rolling contact with the second cam roller η.

On the other hand, the upper end portion 21bK of the second lifting rod 21 is fixedly connected with a bifurcated second holding member by means of a bracket 26'bK. The bearing portion 26aK is fitted so as to reciprocate and slide against the second feed rod that pushes the feed rod 13 having the feed claw 12 that feeds the lead frame a intermittently. A coil spring t228 is passed between this holding member and the substrate 1, and this coil spring t228 gives the second elevating rod 21 a rising habit and also causes the second cam roller n to move upward. It is K so that it can come into rolling contact with the second upward/downward movement cam 25.

On the other hand, a contact member 16 is pivotally attached to the free end 1i113aK of the feed rod 13 located directly above the spinning horizontal feed cam member lO, and a differential cam for horizontal feed pitch conversion is attached to the contact member 16. A member hole is removably provided, and this differential cam member hole, the first cam surface 29a and the second cam surface 2
91), and when this first cam surface 29a is used, the pitch PB of the lead frame a,
On the other hand, when the second cam surface 29t+ is used, the pitch PL of the lead frame a, that is, the stroke L+8, is used. A cam follower I having a concave portion 30a is pivotally attached to one end 27a of the second feed rod n near @29, and a roller 31 attached to the cam follower side is connected to the differential cam member. The first cam surface 29a and the second cam surface '2qbt'c of the hole can selectively come into rolling contact. Furthermore, a swinging stack 18 is pivotally attached to the machine frame located directly above the horizontal feed cam member 10 using a support shaft 17, and one end 18a of the swinging stack 18 is connected to the cam driven by the cam member 10. The inner surface Km of the concave portion 31Ja of the body I is in contact, and the other end portion isb of the swing stacking rod 18 is in contact with the horizontal feed cam member I.
It is pressed against the end surface 10a of O by the elasticity of the coil spring 14.

The following describes the effects of the present invention.

(1) When performing intermittent feeding of pitch of lead frame a When performing intermittent feeding of pitch (stroke 4) L, release clutch A in advance so that the second upper/lower moving cam 5 does not rotate. Do it like this.

Next, by driving the motor 6, the rotary shaft 7, which is integral with the output shaft 61 of the motor 6, rotates together with the up/down movement cam 9 made of a disc cam, so that the above-mentioned up/down movement cam 〇 #i: Since the cam roller 24 is pressed down, the elevating rod 3, which is integral with the cam ruler 4, descends with the elasticity of the coil spring 15.

Then, since the holding member 11 of the lifting rod 3 also descends, the holding member liO feed rod 13 also descends together with the feeding claw 12 and engages with the ear hole bK of the lead frame a.

On the other hand, since the horizontal feed cam member 10 of the rotating shaft 1 rotates the swinging stack 18 to the right around the support shaft 17, the cam follower (material) that comes into contact with one end 18aK of the swinging stack 18 ), the first cam surface 29a with a strong differential force moves forward (to the right) by an amount equivalent to one pitch due to the elasticity of the coil spring 14. The feed claw 12 moves the lead frame a forward by an amount equivalent to one pitch.

Next, when the upper/lower movable cam 9 rotates and the elevating rod 3 integrated with the cam roller 4 that rolls into contact with it rises due to the elasticity Kj of the coil spring 15, the feed pawl 12 of the feed rod 13 moves as follows.
It is separated from the ear hole of the lead frame a.

On the other hand, since the upper horizontal feed cam member IO rotates the swing stack 18 around the support shaft 17, the roller 31 of the cam follower I that comes into contact with the other end of the swing stack 18 is driven by the differential force. The roaring first cam surface 291 is moved backward (to the left) by an amount L1e equivalent to one pitch against the elasticity of the coil spring 14 and retreated.

In this way, the feed pawl 12 is intermittently moved by the lead frame at-1 pitch L.

(2317-)" When performing intermittent feeding of pitch FL (Metrof) L+B of frame a. When performing intermittent feeding of pitch (Store) L+8, connect the clutch in advance and perform the second up/down movement. K so that the cam 6 rotates.

Therefore, when the motor 6f is driven, the motor 6
Since the rotary shaft 7, which is integral with the output shaft 6&, rotates together with the second upper and lower shift cams 5 via a separate clutch,
The upper/lower moving cam 5 presses down the second cam roller n in synchronization with the upper/lower moving cam 9, so this second cam a
- The M2 lifting rod 21, which is integral with the run n, descends with the elasticity of the coil spring 15. Then, the holding member 11 of this second lifting rod 21 also descends to #. In this case, the second above
Since the lower moving cam 5 is formed smaller than the above-mentioned upper and lower moving cams 9, the roller 31 of the cam driven wheel 1 descends within the range where it contacts the second cam surface 29t+Km of the differential cam 9.

Therefore, since the holding member 11 of the lifting rod 3 is also lowered together by the upper and lower moving cams 9, the holding member 11 is lowered together with the feed rod 1341 and the feed pawl 12 and reaches the ear hole of the lead frame a. engage.

On the other hand, since the horizontal feed pitch cam member lO rotates the swinging stack 18 to the right around the spindle 17 as described above, one end 18 a K m of the swinging stack 18 The second cam and surface 29b of the differential cam member 29 move forward by an amount equivalent to l pitch (L+8') by the elasticity of the coil spring 14 via the contacting cam-driven closed roller 31, so that this differential cam Feed claw 12 of feed rod 13 integrated with member 4
moves lead frame a forward by an amount equivalent to one pitch (L+lfe).

Next, the second upper and first lower movable cam δ rotates together with the upper and lower movable cams 9, and the drop rod 3 integrated with the cam roller 4 that rolls into contact therewith is raised by the elasticity of the carp spring 15. The lifting rod 21 of the hook 2 also rises due to the elasticity of the coil d. Then, the feed pawl 12 of the feed rod 13 is separated from the ear hole of the lead frame a.

On the other hand, since the horizontal feed cam member 10 rotates the swinging stack 18 to the left around the spindle 17, the roller 3 which is not driven by the cam
1 connects the second cam surface 29b of the differential cam member 4 to the coil spring 1
It resists the elasticity of 4 and moves backward (to the left) by an amount equivalent to one pitch (b
+s) and retreat.

In this way, the feed claw 12 can intermittently move the lead frame a having different pitch intervals one pitch at a time.

Incidentally, by replacing the differential force unevenness mentioned above, it can be used for intermittent feeding operation of lead frames with different pitches.

〔Effect of the invention〕

As described above, according to the present invention, the substrate l has a pair of upper and
A pair of elevating rods 3, 2 that move up and down with a downward movement cam 9.25
1 is vertically mounted on a shaft, each holding member 11 is provided on the upper part of each lifting rod 3°21, and a feeding claw 1 is provided on one of the holding members 11.
A second feed rod 13 having a cam follower member is fitted to the other holding member, and a second feed rod 13 having a cam follower member is fitted to the other holding member. A differential cam member for horizontal feed pitch conversion that comes into contact with the cam driven member joint is detachably provided at the end of the rod 13, and the differential cam member 29 is connected to the horizontal feed cam member 10 via the swinging lever 18. Since it is designed to transmit horizontal feed motion, it is possible to selectively perform intermittent feed with different strokes.
This book has excellent effects such as not only being able to selectively intermittent feed lead frames with different pitches but also being able to be introduced to existing devices of this type.

[Brief explanation of drawings]

FIG. 3 is a side view of an intermittent feeding device for a lead frame that has already been proposed, and FIG. 4 is a side view of an intermittent feeding device for a lead frame according to the present invention. It is a diagram. 1... Board, 2... Bearing, 3... Lifting rod, 6...
・Motor, 7...Rotating shaft, 9...Upper/downward movement cam,
1o...Horizontal feed cam member, 11...Holding frame, 1
2...Feeding claw, 13...Feeding rod, 18...Swinging rod, ■...Second bearing, 21...Second lifting rod, feeder...
・Clutch, 5...Second upper/lower movement cam, part...Second
Holding member, 29...differential cam member, addition...cam driven member.

Claims (1)

[Scope of Claims] 1. A pair of elevating rods that are moved up and down by a pair of upward and downward movement cams are vertically mounted on the base plate, each holding member is provided on the upper part of each of the elevating rods, and one of the holding members is a feed rod having a feed claw is urged forward and fitted so as to slide back and forth; a second feed rod having a cam follower is fitted to the other holding member;
A differential cam member for horizontal feed pitch conversion that is in contact with the driven cam member is removably provided at the end of this feed rod, and the horizontal feed cam member is connected to this differential cam member via a swinging stack to perform horizontal feed. An intermittent feeding device for a lead frame, characterized in that it has a Z5K that can conduct motion. 2. Two disc cams of different sizes are installed via an electromagnetic clutch on a rotating shaft equipped with a horizontal feed cam member to raise and lower the elevator rod, and the electromagnetic clutch