JP2522008B2 - Transfer forming tablet supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention is directed to a transfer mold in which a plurality of resin introducing holes (pots) are formed in one row, and the same number of tablets as the pots are supplied at one time. The present invention relates to a tablet supply device.

“Prior Art” For example, in a transfer mold in which a resin package is formed on a lead frame, the lead frame is set between the upper mold and the lower mold and is formed in a line on the upper surface of the upper mold (or the lower mold). A resin tablet as a molding material is put in the pot, and then the resin is extruded from each pot into each cavity by an auxiliary ram to mold the package.

Conventionally, in the case of automatically supplying tablets to this type of transfer die, a feeding robot that repeatedly picks up each tablet on the transfer line with a holding claw and carries it to each pot of the die to drop it Was used. The reason why such a robot is used is that it can cope with the case where the number of pots and the interval of the mold are changed.

"Problems to be solved by the invention" However, in the above-mentioned supply robot, a series of operations such as picking up a tablet, transferring it, dropping it in the pot, and returning to the initial position again are performed by opening the mold. Since the number of pots has to be repeated before the start, recently, with the increase in the number of elements per frame, there has been a problem that it cannot keep up with the speeding up of the molding cycle, which has been a factor that hinders the improvement of productivity. .

"Means for solving the problems" The present invention has been made to solve the above problems,
An alignment mechanism that arranges the tablets in a row at the same interval as the transfer die pot row on a horizontal tablet mounting surface, and a grip that can fix these aligned tablets by sandwiching them from both sides with a pair of parallel clamp bodies. It is characterized by comprising a mechanism and a transfer mechanism for transferring the holding mechanism to the position where each tablet is dropped into the pot.

[Working] With the tablet supply device of the present invention, while performing transfer molding with the mold, for the time being, the same number and the same number of tablets as the pot row of the mold are placed on the tablet mounting surface different from the mold. The tablets are arranged by the alignment mechanism, and the tablets are held by the clamp body of the clamp mechanism in the aligned state. Then, when the mold is opened and the tablet is ready for introduction, this holding mechanism is moved to the pot position of the mold by the transfer mechanism, and all the tablets are dropped into each pot at the same time. As a result, the time required for tablet supply can be significantly shortened even for a mold having a large number of pots.

[Example] Hereinafter, a transfer molding apparatus adopting an example of a tablet supply apparatus according to the present invention will be described with reference to the drawings.

First, an outline of the entire molding apparatus will be described with reference to FIGS. 1 is a front view of the apparatus, FIG. 2 is a plan view, FIG. 3 is a right side view, and FIGS. 4 and 5 are a right side view and a left side view with a cover attached. The front, back, left, and right used in the description are based on the state of the apparatus viewed from the front.

In the figure, reference numeral 1 is a magazine mounting table fixed on a base 2, on which a plurality of box-shaped magazines M having openings at both ends are arranged at equal intervals. A large number of horizontal grooves are formed on the inner surfaces of both side plates of the magazine M, and a large number of lead frames are stacked in a stack along these horizontal grooves. In addition, 3 is for lifting the magazines M one by one from the mounting table 1,
It is a magazine transfer mechanism that is placed on the P1 position on the turntable 4. The turntable 4 can be moved up and down and rotated. Reference numeral 5 is a frame pushing mechanism, and depending on its arm 5A, P1 position on the turntable 4 or P2.
The lead frames L are pushed out to the right one by one from the magazine M at the position alternately. The two lead frames L pushed out are transferred into the transfer mold 8 by the frame / tablet transfer mechanism 6 together with a predetermined number of resin tablets T ... Which are aligned by the tablet alignment mechanism 7, and are set in the lower mold thereof. It Behind the transfer mold 8, a cleaning mechanism 9 for cleaning the facing surfaces of the upper mold and the lower mold.
Is provided. The lead frame L with culls in which the resin package is formed by the mold 8 is separated from the culls by the gate break mechanism 10 and housed in the rack 12 by the product storage mechanism 11.

Next, the tablet alignment mechanism 7, the tablet holding mechanism 50, and the frame / tablet transfer mechanism 6, which are the main parts of the present invention, will be described in detail in order.

At the rear part of the base 2, as shown in FIG.
Are erected vertically, and an elevating table 16 is attached to these columns 15 so as to be vertically movable. As shown in FIG. 7, a rotary shaft 18 having pinions 17 fixed to both ends is horizontally supported in the lift table 16, and a servo motor 21 (see FIG. 8) is provided via a pulley 19 and a timing belt 20. As it is rotated,
Each pinion 17 meshes with a rack tooth formed on each column 15.

A vibrating feeder 22 is fixed on the elevating table 16, and a hopper 23 is fixed on the vibrating feeder 22 with the opening 23A facing forward. In addition, when the lifting table 16 is raised, the hopper opening
A trough-shaped receiving member 24 is fixed on the base 2 at a position continuous with 23A, and a circular parts feeder 25 is arranged below the front end of the receiving member 24. The parts feeder 25 has a spiral staircase portion in the internal combustion. The cylindrical tablet T is oscillated and transferred while standing up along the staircase portion, and is sequentially drawn out from the gutter member 26 connected to the outer circumference. This gutter member
Reference numeral 26 extends to above the frame / tablet transfer mechanism 6, and an air cylinder 27 is attached to the front end of the lower end of the frame / tablet transfer mechanism 6. A receiving plate 28 connected to the end of the gutter member 26 is fixed to the tip of the rod of the air cylinder 27, and an L-shaped stopper 29 is attached to the side of the receiving plate 28 so as to be horizontally rotatable by 90 °. There is. Then, when the rod of the air cylinder 27 is moved forward, the receiving plate 28 on which only one tablet T is placed moves onto the mold center line O, and at the same time, the stopper 29 rotates to rotate the other tablet from the gutter member 26. It is configured to prevent T from falling.

On the other hand, as shown in FIGS. 8 and 9, a pair of guide bars 30 and a ball screw 31 are arranged in parallel with the mold center line O on the side opposite to these, and are placed on the base 2. It is supported by a fixed frame 32. A support 33 is slidably fixed to the guide bar 30, and is driven by the ball screw 31 via a ball nut 34. A pulley 35 is fixed to one end of the ball screw 31,
It is rotated by a servo motor 37 fixed to the frame 32 via a timing belt 36. Further, an air cylinder 38 is fixed downward to the support 33, and a chuck cylinder 39 having a pair of holding claws 39A is fixed to the lower end of the rod, and the tablet T on the receiving plate is picked up. It is designed to be carried along a mold center line O to a tablet mounting table 13 fixed on the base 2.

Next, the frame / tablet transfer mechanism 6 will be described. As shown in FIGS. 11 and 12, from the vicinity of the turntable 4, two guide bars 40 are arranged in parallel with the mold center line O and pass behind the mold 8 to pass the right end of the apparatus. It is fixed at. Further, two ball screws 41 are provided in parallel with the guide bars 40 and are driven by different stepping motors (not shown).

A first claw support 42 and a second claw support 43 are attached to the guide bar 40 and the ball screw 41 in order from the side closer to the turntable 4. These nail supports
42 and 43 are L-shaped, and the guide bar 40,
The ball screw 41 is inserted through the ball screw 41 and the ball screw 41, and the ball screw 41 is meshed with another ball screw 41 via a ball nut 44 so as to be driven separately.

Servo motors 45 are fixed to the claw supports 42 and 43, respectively, and a pair of rack members 47 are horizontally opened and closed via a pinion 46. These rack members 47
Twin rod cylinders 48 are fixed downward at one end of each, and chuck cylinders 49 having horizontal upper claws 49A and lower claws 49B are attached to the tip ends of the twin rod cylinders 48 so as to face each other. There is.

Further, a tablet holding mechanism 50 is integrally provided on the second claw support 43 as shown in FIG. Second
A rectangular support plate 52 is fixed to the lower surface of the horizontal portion of the claw support 43 via a pair of connecting members 51. This support plate 52
As shown in Fig. 13, there is an elongated rectangular opening in the center.
52A is formed, and the sliding shaft 53 is supported by bosses 54 at both ends along the center line of the opening 52A.
It is connected to 55 rods. Further, two L-shaped cranks 56 are symmetrically arranged on both sides of the sliding shaft 53, and a central portion thereof is rotatably attached by a pin 57.
A long hole 58 is formed at one end of each of the cranks 56, the long holes 58 of the cranks 56 facing each other are overlapped, and a convex portion 53A formed on the sliding shaft 53 is fitted therein. Also within the opening 52A is a pair of rectangular clamp plates 59 on either side of the sliding shaft 53.
Are arranged in parallel and are attached to the support plate 52 via the clamp shaft 60 and the boss 61. And each clamp axis
Protrusions 60A are formed at the other end of 60, and these protrusions 60A are fitted in notches 62 formed at the ends of each crank 56. As a result, when the rod of the cylinder 55 is projected, the intervals between the clamp plates 59 are narrowed, and the tablets T on the tablet mounting table 13 are all sandwiched and fixed. In addition, the tablet T is provided on the facing surface of each clamp plate 59.
An elastic plate may be attached to prevent slippage.

 Next, the operation of each unit of the above device will be described.

First, in order to introduce the tablets T ... Into this apparatus, the servo motor 21 is operated to lower the hopper 23 in FIGS. 6 and 7, and a predetermined amount of tablets T ... Is put therein. Next, the hopper 23 is returned to its original position, the vibrating feeder 22 is operated, and the tablets T ... Within the hopper 23 are dropped into the parts feeder 25 via the receiving member 24. Then, the tablets T ... Are aligned in the upright state and then pulled out along the gutter member 26. Next, stick out the rod of the air cylinder 27,
The receiving plate 28 on which one tablet T is placed is moved forward. Then, this tablet T is sandwiched by the chuck cylinder 39, the servo motor 37 and the air cylinder 38 are operated, and the same number of tablets T are repeatedly arranged on the mounting plate 13 at the same intervals as the pot row of the die 8 (first). (See Figure 10).

On the other hand, in parallel with the above operation, the magazine M on the magazine mounting table 1 is lifted by the magazine transfer mechanism 3 and moved to the position P1 of the turntable 4. Next, the turntable 4 is rotated by a half turn to move the magazine M to the P2 position, and another magazine M is placed on the P1 position again. Then, the lead frame L is pushed out one by one from each magazine M by the arm 5A of the frame pushing mechanism 5. At the same time, the end of the lead frame L pushed out is pinched by the claws 49A and 49B of the first claw support 42 (11th claw).
(See the drawing), and then the first claw support 42 is replaced with the second claw support.
The lead frame L is completely pulled out from the magazine M by moving the lead frame L to the 43 side, and the end portions of the lead frame L are sandwiched by the claws 49A and 49B of the second claw support 43. Then, the first claw support 42 is returned to the original position, and the above operation is performed for the other lead frame L, so that the claws 49A, 49 on both sides of the second claw support 43 are formed.
One end of each lead frame L is sandwiched by B, and the other end of each lead frame L is attached to the lower claw 49B of the first claw support 42.
Place it on and support it.

At the same time, the tablet holding mechanism 50 provided under the second claw support 43 is operated to sandwich the tablets T ... Arranged on the mounting table 13 with both clamp plates 59 (see FIG. 12).

Then, while maintaining this state, the claw supports 42, 43 are moved into the mold 8 where the mold is opened, the lead frames L are positioned on the upper surface of the lower mold, and the clamp plate 5
Open 9,59 and drop tablets T ... into the pots formed in the lower mold at the same time. And further, the nail supports 42,43
Each servo motor 45 is energized to horizontally open the rack members 47, 47 to release the lead frames L from the claws 49A, 49B and return the claw supports 42, 43 to the initial positions. .

After that, the mold 5 is closed and transfer molding is performed, while the above-described operation is repeated to obtain lead frames L, L.
Prepare tablets T ... and wait until the mold opens.

As described above, in this apparatus, while the transfer die is being performed by the die 8, the tablets T ... Are aligned on the tablet mounting table 13 apart from the die 8 for the time being, and both clamps of the holding mechanism 50 are clamped. Since the plate 59 can be held by holding it in the aligned state, when the die 8 is opened and ready for tablet introduction, the holding mechanism 50 is moved to the pot position of the die by the transfer mechanism 6. It is possible to transfer and drop all the tablets T into each pot at the same time, significantly reducing the time required for tablet supply,
It is possible to shorten the molding cycle and thus improve productivity.

Further, compared to the conventional feeding device in which the tablets are sequentially dropped in the pot of the mold one by one, the time from when the tablets are put in the pot to the start of molding is calculated for all tablets T.
Therefore, the preheating condition of each tablet T can be made uniform, and the softening condition of each tablet T can be made uniform.
It is possible to prevent injection variations in each cavity. Further, the tablet mounting table 13 may be provided with a heating mechanism so as to uniformly preheat the tablet T while it is mounted.

Further, in the above apparatus, since the tablets T are arranged by the ball screw 31, even if the number of pots or the pot interval of the mold 8 is changed, it can be easily dealt with by changing the operation program. It has the advantage of high versatility.

Incidentally, the present invention is not limited to the above-mentioned device, for example, changing the position of the tablet mounting table 13 and separating the tablet transfer from the lead frame transfer, etc., by appropriately changing the configuration of each part as necessary. Good.

[Advantages of the Invention] As described above, according to the transfer-molding tablet supply device of the present invention, while the transfer molding is being performed by the mold, the tablets are temporarily aligned on the tablet mounting table separated from the mold. Since the clamp plate of the holding mechanism can hold it by holding it in the aligned state, it can be moved to the pot position of the mold by the transfer mechanism and all the tablets can be placed in each pot at the same time. It is possible to drop it, and it is possible to significantly reduce the time required for tablet supply, shorten the molding cycle, and improve productivity.

Also, compared to the conventional feeding device that drops tablets one by one in the pot of the mold, the time from putting in the pot to the start of molding is the same for all tablets, so softening of each tablet It is also possible to obtain the effect of making the condition uniform and preventing the injection variation in each cavity.

[Brief description of drawings]

1 to 5 show an outline of a transfer molding apparatus which employs an example of a lead frame transfer mechanism according to the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, and FIG.
The drawing is a right side view, and FIGS. 4 and 5 are a right side view and a left side view with a cover attached. 6 to 10 show a tablet aligning mechanism, FIG. 6 is an overall plan view, FIG. 7 is a partial side view, FIG. 8 is an overall side view, and FIG. FIG. 8 is a sectional view taken along the line IX-IX in FIG. 8, and FIG. 10 is an explanatory diagram of the tablet alignment operation. Further, FIG. 11 is a plan view of the frame / tablet transfer mechanism, FIG. 12 is a side view of the mechanism, and FIG. 13 is a plan view of the tablet holding mechanism. T ... tablet, L ... lead frame, M ... magazine, 6 ... frame / tablet transfer mechanism, 7 ... tablet alignment mechanism, 13 ... tablet mounting table (mounting surface) 50 ... tablet holding mechanism, 59 …… Clamp plate (clamp body).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-128910 (JP, A) Actual opening 60-130016 (JP, U) Actual opening 63-66210 (JP, U)

Claims (1)

(57) [Claims] 1. An aligning mechanism for arranging tablets in a row at the same interval as a pot row of a transfer die on a horizontal tablet mounting surface, and a pair of parallel clamp bodies sandwiching the aligned tablets from both sides. A transfer-molding tablet supply device, comprising: a holding mechanism that can be fixed in place, and a transfer mechanism that transfers the holding mechanism to a position where each tablet is dropped into a pot.