JPH081258A - Method for conveying and positioning hoop like lead frame and device therefor - Google Patents

Abstract

PURPOSE:To precisely position and to accurately convey even in the case of generating the expansion/contraction or the deformation on a hoop like lead frame 2 caused by the exertion, etc., of the thermal change or the heat stress by executing mold press. CONSTITUTION:The device is provided with a die position detecting sensor 16 to detect whether or not the relative approaching moving distance of a lower die 9 against an upper die 8 in an executing time of mold press is more than a prescribed distance 9 and a driving motor 3 capable of rotating forward and backward which is arranged on the way of the conveying route of the hoop like lead frame 2 and drives to feed the frame 2. Further, it is provided with a mark detecting sensor 15 to detect the specified position of marks formed on the frame 2 and arranged in an interval corresponding to the feeding amount of every one time, and a rotation controlling means to control the forward and backward rotation of the driving motor 3 based on the signal of the die position detecting sensor 16 and the mark detecting sensor 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for conveying and positioning a hoop-shaped lead frame and an apparatus therefor. The present invention relates to a technique for accurately and smoothly performing the transport control and the positioning control.

[0002]

2. Description of the Related Art Conventionally, in a manufacturing process of semiconductor products and the like, a molding process such as a transfer molding method for performing resin sealing after die bonding or wire bonding is performed on a strip-shaped lead frame. Is executed. In this type of manufacturing process, for example, a plurality of the strip-shaped lead frames stored in a magazine or the like that can be vertically moved by an elevation mechanism are sequentially taken out one by one at a predetermined work station, It was considered that the general method was to carry out the processing.

However, in the above-mentioned method, each process such as mold pressing is performed on the strip-shaped lead frame, so that the process steps are divided, the process cycle is lengthened, and the productivity is increased. The reality was that it was forced to deteriorate.

As a solution to such a problem, for example, as disclosed in Japanese Patent Laid-Open No. 59-80956, a long strip-shaped hoop-shaped lead frame is continuously and intermittently conveyed and then conveyed. A method of performing each processing at each station in the middle of the route has been adopted.

In the publication, a specific structure of a positioning mechanism for accurately positioning the hoop-shaped lead frame conveyed by a pulse motor at a predetermined station, for example, a station for performing a plating process. It is disclosed. The positioning mechanism includes a through hole formed in the hoop-shaped lead frame and a pin member that can be inserted into and removed from the through hole. And
When the hoop-shaped lead frame is conveyed to a predetermined position, the air cylinder or the like operates to insert the pin member into the through hole. As a result, the hoop-shaped lead frame is in a state of being set and held at a predetermined position for performing a plating process or the like.

[0006]

By the way, in the molding step in the manufacturing process of the semiconductor products and the like, the compression molding process is carried out under a heating condition, and the hoop-shaped lead frame subjected to the molding process is thin-walled. Because of the shape, a large heat stress acts. In addition, at the time of relative approach movement of the upper die and the lower die during the compression process, the die moves closer to the other die while the hoop-shaped lead frame is pressed against the surface portion of the one die. I will go.

Under the influence of such temperature change and pressing force or pulling force, the hoop-shaped lead frame may expand or contract or deform. Therefore, as disclosed in the above publication, the mechanical method of performing positioning by engaging the through hole formed in the hoop-shaped lead frame with the pin member is adopted. Of the through hole changes and the position where the through hole is formed deviates from an accurate position, resulting in a problem that the positioning accuracy deteriorates or the positioning becomes difficult.

Further, due to the expansion and contraction or deformation of the hoop-shaped lead frame as described above, the hoop-shaped lead frame is also similarly conveyed with respect to the engagement holes formed in the hoop-shaped lead frame at a predetermined pitch. There is also a problem that the teeth of the sprocket are not meshed with each other and it becomes difficult to carry them properly.

The present invention has been devised under the circumstances described above, and the hoop-shaped lead frame is expanded or contracted or deformed due to temperature change or thermal stress caused by performing a molding process. It is an object of the present invention to provide a method and an apparatus for carrying and positioning a hoop-shaped lead frame, which can carry out highly accurate positioning and accurate carrying even in the case of occurrence of.

[0010]

In order to solve the above problems, the present invention takes the following technical means.

That is, according to the invention described in claim 1 of the present application, the hoop-shaped lead frame is intermittently conveyed while passing through between the upper mold and the lower mold, and the hoop-shaped lead frame is located. Each time a fixed amount is fed, the lower die is moved toward and away from the upper die to perform mold pressing, and the mold pressing is performed accurately with respect to a predetermined area of the hoop-shaped lead frame. A method for transporting and positioning a hoop-shaped lead frame that is positioned as described above, wherein a mark portion is formed at a position that serves as a reference for the feed amount for each time in the hoop-shaped lead frame, Before or after execution, place the hoop-shaped lead frame in a tensioned state and then feed it in at least one of the forward and reverse directions. Detecting the real position, seeking deviation amount between the position and the ideal position of this reality, it is characterized in that so as to perform the subsequent steps after having corrected the deviation amount.

In this case, when detecting the actual position of the mark portion, the positions of the feed-side edge and the counter-feed side edge of the mark portion are respectively detected, and the positions between these two positions are detected. It is preferable to set the center position in the feeding direction as the actual position of the mark portion (claim 2).

Further, it is preferable that the mold pressing is performed after releasing the tension of the hoop-shaped lead frame.

On the other hand, the invention described in claim 4 of the present application is
A transport path for intermittently transporting the hoop-shaped lead frame is provided via both the upper die and the lower die, and the hoop-shaped lead frame is fed to the upper die each time a predetermined amount is fed. A hoop-shaped lead frame carrying / positioning device configured to perform a mold press by relatively moving the lower mold toward and away from each other, wherein the lower mold is relative to the upper mold at the time of performing the mold press. A mold position detecting means for detecting whether or not the approach movement distance is a predetermined distance or more, a drive motor which is disposed in the middle of the transfer path and which feeds and drives the hoop-shaped lead frame, and which is rotatable in the forward and reverse directions. Marker detection means for detecting a specific position of the mark formed on the hoop-shaped lead frame and arranged at intervals corresponding to the feed amount for each time, and the mold position detection Based on the stage and the signal from the marker portion detection means it is characterized by comprising a rotation control means for controlling the forward and reverse rotation of the drive motor.

In this case, a tension adjusting means for adjusting the tension acting on the hoop-shaped lead frame based on a signal from the die position detecting means and / or the mark detecting means is provided in the middle of the conveying path. It is preferable that it is further provided (Claim 5).

[0016]

According to the invention described in claim 1, immediately after or immediately before the mold pressing is performed on the predetermined area of the hoop-shaped lead frame,
The actual position of the mark portion formed on the hoop-shaped lead frame is detected by using a non-contact detection means such as an optical sensor. When detecting the position of the mark portion, the predetermined area of the hoop-shaped lead frame is expanded or contracted or deformed due to heat or compression force during mold pressing. The hoop-shaped lead frame is tensioned for proper correction.

When the above-mentioned position detection is carried out immediately after the above mold pressing, a mark serving as a reference for the subsequent feed amount in the stage before the hoop lead frame is fed for the next mold pressing. The actual position of the department will be detected. On the other hand, in the case where the above-mentioned position detection is performed immediately before the mold press, the hoop-shaped lead frame is fed by a predetermined amount after the previous mold press, and then the next step before the next mold press is performed. At, the actual position of the mark portion serving as the reference of the mold press area is detected.

In any of the above cases, when the position of the mark portion on the hoop-shaped lead frame deviates from the normal position due to expansion and contraction or deformation by the mold press, the detected mark portion is detected. The amount of relative deviation between the actual position and the ideal position, that is, the amount of deviation is calculated. Here, the ideal position is a position where the mark portion should originally exist when the hoop-shaped lead frame is not deformed, and the relative position with respect to the installation position of the mark portion detection means. It is a determined position.

After this, the above-mentioned deviation amount is position-corrected, and the subsequent steps, for example, feeding of the hoop-shaped lead frame or mold pressing are performed. More specifically, if the position detection is performed immediately after performing the mold pressing described above, the feed amount of the hoop-shaped lead frame is determined after the displacement is corrected, and immediately before performing the mold pressing. Taking the case of position detection as an example, the mold pressing is performed after the position of the hoop-shaped lead frame is corrected by the amount of the deviation.

Therefore, as in the conventional case where a mechanical positioning mechanism such as a pin engaging / disengaging mechanism is adopted,
There is no influence of expansion and contraction or deformation of the hoop-shaped lead frame due to mold pressing, accurate positioning is performed, and high-precision and high-quality mold pressing is performed on the predetermined area of the hoop-shaped lead frame. Be seen.

Further, according to the invention described in claim 2, two positions, that is, an edge on the feed side and an edge on the counter-feed side of the mark portion are detected, and further, a position between the two positions is detected. The center position of is calculated. Even if the hoop-shaped lead frame is displaced in the width direction, for example, the center position determined as described above always indicates the center of the mark portion in the feed direction. Therefore, if the deviation amount is corrected with this position as a reference, highly accurate correction can be performed.

According to the third aspect of the invention, since the tension state of the hoop-shaped lead frame is released when performing mold pressing, one mold moves closer to the other mold. This prevents the hoop-shaped lead frame from being unduly deformed by the excessive pulling or pressing force of the mold not acting on the hoop-shaped lead frame. When an excessive pulling force acts on the hoop-shaped lead frame, the specific portions of the surface portion of the mold to be engaged and the hoop-shaped lead frame are engaged due to the pulling force. Although it is difficult, if the hoop-shaped lead frame is in a moderately loose state as described above, it is possible to ensure smooth engagement between the specific parts on both sides, such as the mold positioning pin and the pin hole of the hoop-shaped lead frame. To be done.

On the other hand, according to the invention described in claim 4, when the mold pressing is performed, one mold is moved closer to the other mold so as to be interposed between the two molds. The surface of one of the molds contacts the hoop-shaped lead frame. Then, when the approaching movement distance of one of the molds becomes a predetermined distance or more, more specifically, for example, when it reaches a point before an excessive pressing force acts on the hoop-shaped lead frame in the contact state, that is The position detection means detects. At the time of this detection, the rotation control means reverses the drive motor based on the signal from the die position detection means, whereby the tension state of the hoop-shaped lead frame is released. As a result, the mold pressing is performed under the condition that the hoop-shaped lead frame is appropriately loosened, and the same effect as the invention described in claim 3 is obtained.

Before or after the mold pressing is performed, the mark portion detecting means detects the specific position of the mark portion formed on the hoop-shaped lead frame. Then, as a result of this detection, when the actual specific position of the mark portion deviates from the normal position,
Based on the signal from the mark detecting means, the rotation control means sends a signal for performing a correction according to the deviation amount to the drive motor. Therefore, if this correction is performed immediately after execution of the mold press, it is sufficient to correct the shift amount for the feed amount for sending the hoop-shaped lead frame to the next mold press position. When performing the step immediately before the execution of the mold press, the position of the hoop-shaped lead frame may be corrected by rotating the drive motor by the amount of the deviation. Therefore,
The same effect as that of the invention described in claim 1 can be obtained.

Further, according to the invention described in claim 5, since the tension adjusting means is provided, when the tension state of the hoop-shaped lead frame is released when the mold pressing is performed as described above. Simultaneously with the reverse rotation of the drive motor, the tension adjusting means makes the degree of relaxation of the hoop-shaped lead frame appropriate on the basis of the signal from the die position detecting means. Further, as described above, the drive motor may rotate in the reverse direction even when the mark portion is detected. In this case, the tension adjusting means maintains the hoop-shaped lead frame in an appropriate tension state. Acts to keep. The tension adjusting means can prevent the hoop-shaped lead frame from falling off the teeth of the feed sprocket by appropriately changing the tension.

As described above, if the tension adjusting means is provided, the degree of tension and relaxation of the hoop-shaped lead frame can be appropriately adjusted according to different situations such as during mold pressing, position correction, and transportation. Can be changed,
Each process can be performed smoothly and accurately.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 1 is a block diagram showing a control system of a hoop-shaped lead frame carrying / positioning device according to the present invention, and FIG. 2 is a front view showing a schematic configuration of the device.

First, referring to FIGS. 1 and 2, the basic structure of the carrying / positioning device 1 will be described. The carrying path of the hoop-shaped lead frame 2 is a rotation shaft of a drive motor 3 which can rotate in the forward and reverse directions. The drive sprocket 4 attached, the tension sprocket 6 mainly attached to the rotary shaft of the torque motor 5 that mainly performs the tension adjusting action, and the plurality of guide sprocket 7 are stretched in a bent shape in the arrow direction. It is configured to be sent in the A direction.

The hoop-shaped lead frame 2 is interposed in the gap between the upper die 8 and the lower die 9 at the station X for performing mold pressing. In this embodiment, the upper mold 8 is fixedly installed, while the lower mold 9 is held by a fluid cylinder 10 such as an air cylinder or a hydraulic cylinder so as to be vertically movable and the plunger 1
1 is configured to apply a predetermined compression force.

FIG. 3 shows a plan view of the hoop-shaped lead frame 2, in which a large number of semiconductor elements 12 are arranged on the upper surface thereof. Then, in this embodiment, 16 rows of semiconductor elements 12 are formed by the above-mentioned molds 8 and 9 into one.
Mold press is performed by shot, and resin sealing is performed.
As a molding method in this case, a transfer molding method is adopted.

Further, as shown in the figure, the sprocket 4, 6, 6 is provided on both side edges of the hoop-shaped lead frame 2.
Engagement holes 13 with which the tooth tips of 7 are engaged are provided. The medium used to drive and guide the hoop-shaped lead frame 2 does not have to be a sprocket as described above, and can be reliably engaged with the hoop-shaped lead frame 2 such as a toothed pulley or a gear. Other materials may be used as long as they can be driven for conveyance.

Further, the hoop-shaped lead frame 2 has one of 16 rows of semiconductor elements 12 for one shot.
A circular mark portion 14 is formed corresponding to the row. The mark portion 14 may be a through hole or a mark with a predetermined color or the like. The shape of the mark portion 14 is not limited to the circular shape as described above, but may be an elliptical shape, a rectangular shape, or the like.

Then, as shown in FIG. 2, the station X of the mold press is constituted by a non-contact type sensor such as an optical sensor for detecting the positional deviation of the mark portion 14 of the hoop-shaped lead frame 2. Mark detecting means 15
Is provided. When the hoop-shaped lead frame 2 is conveyed and stopped at an appropriate position where mold pressing is performed between the upper die 8 and the lower die 9, the mark portion detecting means 15 has the mark portion 14 immediately below. It is arranged at the position where

Further, at the station X, it is detected whether or not the lower die 9 has reached a predetermined height position in the process of pushing up the hoop-shaped lead frame 2 and ascending to perform the mold pressing. A mold position detecting means 16 is provided. This mold position detecting means 16 uses limit switches in this embodiment, but it is also possible to use non-contact type sensors such as optical sensors.

As shown in FIG. 1, the control system for each of the above-described components receives the signals a and b from the mark detecting means 15 and the mold position detecting means 16 as input to the rotation control means 17. A control signal c is sent from the rotation control means 17 to the drive motor 3. In this embodiment, the drive motor 3 comprises a servo motor 18 having a counter 18a.
The current transportation position of the hoop-shaped lead frame 2 due to the rotation of 8 is shown as a count value by the counter 18a. Therefore, by inputting the count value of the counter 18a as the count signal d to the rotation control means 17, it is possible to perform feedback control for transporting the hoop-shaped lead frame 2 to the position where it should be sent and stopping it.

Further, the signals a'and b'from the mark detecting means 15 and the mold position detecting means 16 are inputted to the tension adjusting means 19. If the specific example is explained in full detail, the tension adjusting means 19 causes the signals a ′,
It is composed of the tension control means 20 to which b'is input, and the above-described torque motor 5 to which the control signal e from this tension control means 20 is input. In the torque motor 5, the tension acting on the hoop-shaped lead frame 2 can also be switched between high and low levels by switching the torque between high and low levels.
It can be in a state of zero tension, and can also be reversed.

Next, a carrying / positioning method using the apparatus 1 having the above configuration will be described.

First, after die-bonding, wire-bonding and the like are performed in the previous step, in the station X of a mold press shown in FIG. The lower die 9 is raised under the condition of being located between the lower die 9 and the lower die 9.

When the limit switch 16 detects that the hoop-shaped lead frame 2 has reached a predetermined height position in contact with the surface of the lower mold 9, the rotation control means shown in FIG. The detection signal b is input to 17.
Along with this, a control signal c is sent from the rotation control means 17 so that the servo motor 18 slightly reverses (f in FIG. 2).
Rotation in the direction). At the same time, the detection signal b ′ from the limit switch 16 changes the tension control means 20.
Is input to the torque motor 5 and the tension control means 20 outputs the control signal e, the torque motor 5 is brought into a low torque state. Even if the rotation control means 17 and the tension control means 20 are configured as a single control means,
It is possible to perform the same operation as described above.

As a result, the hoop-shaped lead frame 2
The mold area is pushed up by the lower mold 9 while maintaining a moderately loose state. Then, in the process of being pushed up, a positioning pin (not shown) formed on the surface portion of the lower die 9 and a pin hole of the hoop-shaped lead frame 2 are engaged with each other.

Under such a state, the lower die 9 is further raised and brought into close contact with the upper die 8 to perform a mold press, and a predetermined area of the hoop-shaped lead frame 2 is resin-sealed. Since this mold press is performed under a heated state, the hoop-shaped lead frame 2 is
Due to heat stress or the like, the hoop-shaped lead frame 2 is expanded or deformed.

After that, the lower die 9 descends to reach a predetermined height position, so that the contact with the limit switch 16 is released, and a signal b indicating this is input to the rotation control means 17. As a result, the servo motor 18 rotates in the normal direction (rotates in the g direction shown in FIG. 2), and the hoop-shaped lead frame 2 becomes in a tensioned state. In this case, the normal rotation angle of the servo motor 18 is the same as the reverse rotation angle in the previous stage of performing the mold press.

Then, when the lower die 9 returns to the initial position shown in FIG. 2, the servo motor 18 is rotated in the reverse direction and / or the forward direction, whereby a specific position of the mark portion 14 of the hoop-shaped lead frame 2 is reached. Mark sensor 1
5 to detect. For details, for example, the mark portion 14
Of the feed side is detected and the coordinate at that time is read based on the counter 18a of the servomotor 18, and then the edge of the mark portion 14 on the non-feed side is detected and the coordinate at that time is similarly read. . In other words, the coordinates of two opposite edge edges on a straight line along the feed direction of the mark portion 14 are read.

After that, the rotation control means 17 obtains the central position of the coordinates of the two points by calculation. This allows
The amount of deviation of the mark portion 14 from the ideal position, that is, the amount of deviation due to expansion and contraction or deformation by the mold press is found. In this case, the ideal position may be defined as a position directly below, which is a directivity position of the mark detection sensor 15.
Alternatively, it may be determined based on another relative relationship with the mark detection sensor 15. When the servo motor 18 is rotated in the forward and reverse directions when detecting the two positions of the mark portion 14, the torque motor 5 maintains a high torque state, so that the hoop-shaped lead frame 2 is in a tensioned state. Therefore, with this, highly accurate detection is performed.

In this case, as another method for obtaining the deviation amount of the mark portion 14, for example, the servo motor 18 is stopped every time the mark detection sensor 15 detects the two positions, and The coordinates of the above two positions are obtained based on the number of pulses sent from the rotation control means 17 to the servo motor 18 until the respective positions stop.
The shift amount is also found by the rotation control means 17 calculating the center position of the two coordinates.

After the deviation amount of the mark portion 14 is found in this way, the deviation amount is corrected, and then the servo motor 18 is rotated in the forward direction to perform the next mold press, so that the hoop-shaped lead frame is formed. 2 is conveyed. In this case, the deviation amount is corrected by, for example, utilizing the above-described feedback control, by adding or subtracting the count value of the counter 18a by an amount corresponding to the deviation amount, and then counting the counter value of the counter 18a. The servo motor 18 may be rotated in the normal direction until becomes a value corresponding to the regular feed amount. As another example, using the mark detection sensor 15, the hoop-shaped lead frame 2 is moved until the center position of the mark 14 coincides with the original position, and thereafter, the regular feed amount is dealt with. The servo motor 18 may be normally rotated by the rotation angle.

At the time of conveyance for performing the next mold press, the torque motor 5 is kept in a low torque state so that the hoop-shaped lead frame 2 is unlikely to drop off from the sprockets 4, 6, 7. . Then, when the hoop-shaped lead frame 2 is conveyed by a predetermined amount and stopped, it is preferable to switch the torque motor 5 to a high torque state.

As described above, according to the carrying / positioning method according to the above-described embodiment, the mark detecting sensor 15 and the servo motor 1 are not used without using a positioning mechanism such as mechanical pin engagement.
8 and the torque motor 5 are effectively used in cooperation with each other,
After the position correction, the hoop-shaped lead frame 2 is conveyed. Therefore, the positioning and the conveyance are accurately performed without being affected by the expansion and contraction and the deformation of the hoop-shaped lead frame 2 by the mold press, and the resin sealing of the hoop-shaped lead frame 2 is performed without causing an error.

The carrying / positioning method described above is such that the position is corrected after the mold pressing is performed so that the position where the next mold pressing is performed becomes a regular position. It is also possible to adopt the transportation / positioning method as shown in FIG.

That is, immediately after performing the mold pressing, a predetermined amount is conveyed without position correction, and immediately before performing the next mold pressing, the mark detecting sensor 15 is used to perform the mark 14 in the same manner as described above. The amount of deviation of the center position of is detected. Then, the servo motor 18 is normally or reversely rotated by an amount corresponding to the amount of deviation, and the hoop-shaped lead frame 2 is moved so that the position of the mark portion 14 coincides with the original position. Do it. Therefore, needless to say, in this case, the same effect as the above can be obtained.

In the above embodiment, the present invention is applied to the mold pressing mechanism in which the upper die 8 is fixed and only the lower die 9 moves up and down. Both of them may be close to and apart from each other. Further, the present invention can be similarly applied to a mold press mechanism in which the lower mold is in a fixed state and only the upper mold is moved up and down. In this case, the arrangement positions of the detection means 15 and 16 are changed. Need to change.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system of a carrying / positioning device according to the present invention.

FIG. 2 is a front view showing a schematic configuration of the carrying / positioning device.

FIG. 3 is a schematic plan view of a hoop-shaped lead frame applied to the transport / positioning device.

[Explanation of symbols]

 1 Conveying / Positioning Device 2 Hoop-shaped Lead Frame 3 Drive Motor 5 Tension Adjusting Means (Torque Motor) 8 Upper Mold 9 Lower Mold 14 Marking Part 15 Marking Part Detection Means (Marking Part Detection Sensor) 16 Type Position Detection Means (Limit Switch) 17 rotation control means 18 drive motor (servo motor) 18a counter 19 tension adjusting means

Claims (5)

[Claims] 1. A hoop-shaped lead frame is intermittently conveyed via an upper mold and a lower mold.
Each time the hoop-shaped lead frame is fed by a predetermined amount, the lower die is relatively moved toward and away from the upper die to perform a mold press, and the mold press is configured to move the predetermined shape of the hoop-shaped lead frame. A method for transporting and positioning a hoop-shaped lead frame in which positioning is performed so that the hoop-shaped lead frame can be accurately positioned. Formed, before or after the execution of the mold press, after detecting the actual position of the mark portion while feeding the hoop-shaped lead frame in at least one of the forward and reverse directions after tensioning the hoop-shaped lead frame,
A method for transporting and positioning a hoop-shaped lead frame, characterized in that a deviation amount between the actual position and the ideal position is obtained, and the subsequent steps are executed after correcting the deviation amount. 2. When detecting the actual position of the mark portion, the position of the feed side edge and the position of the counter feed side edge of the mark portion are respectively detected, and the feed direction between these two positions is detected. 2. The method of transporting / positioning a hoop-shaped lead frame according to claim 1, wherein the center position of the hoop-shaped lead frame is determined as the actual position of the mark portion. 3. The method for conveying / positioning a hoop-shaped lead frame according to claim 1, wherein the mold press is performed by releasing the tension state of the hoop-shaped lead frame. 4. A transport path for intermittently transporting the hoop-shaped lead frame via both the upper mold and the lower mold is provided, and the hoop-shaped lead frame is fed every predetermined amount. A hoop-shaped lead frame carrying / positioning device configured to perform mold pressing by moving a lower mold relatively toward and away from an upper mold, wherein Die position detecting means for detecting whether or not the relative approach movement distance of the lower die is equal to or greater than a predetermined distance, and forward / reverse rotation which is disposed in the middle of the transport path to feed and drive the hoop-shaped lead frame. A drive motor, and a mark portion detecting means for detecting a specific position of the mark portion formed on the hoop-shaped lead frame and arranged at intervals corresponding to the feed amount for each time, A transfer / positioning device for a hoop-shaped lead frame, comprising: rotation control means for controlling forward / reverse rotation of the drive motor based on signals from the die position detecting means and the mark detecting means. . 5. A tension adjusting means for adjusting the tension acting on the hoop-shaped lead frame based on a signal from the die position detecting means and / or the mark detecting means is provided in the middle of the conveying path. The hoop-shaped lead frame carrying / positioning device according to claim 4, which is provided.