Double-pressing-wheel film pressing device for copper strip of lead frame

Abstract

The invention discloses a double-pressing-wheel film pressing device for a copper strip of a lead frame, and relates to the technical field of lead frame film pressing, and the double-pressing-wheel film pressing device comprises two groups of hot pressing wheels which are used for carrying out hot pressing lamination on the copper strip and a film; the winding equipment is used for winding the copper strip subjected to film pressing; the two scraping mechanisms are arranged between the hot pressing wheel and the winding equipment and are symmetrical up and down; the scraping mechanism comprises two horizontally-arranged pressing rollers and a driving assembly, wherein the driving assembly drives the pressing rollers to move in a reciprocating mode in the direction perpendicular to the copper strip conveying direction. And the lifting control part is used for realizing alternate lifting of the compression rollers through cooperation of the guide grooves and the guide wheels. The problems that in the prior art, in the lead frame copper strip film pressing process, gas cannot be completely exhausted, bubbles are formed, and then electric conduction is affected are solved. The device has the advantages that by arranging the scraping device, bubbles are removed through the scraping device after film pressing is completed, and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of lead frame laminating technology, and in particular to a double-pressure-wheel laminating device for copper strips of lead frames. Background Art

[0002] As a chip carrier for integrated circuits, a lead frame is a key structural component that realizes the electrical connection between the internal circuit leads of a chip and the external leads by means of a bonding material to form an electrical circuit. It serves as a bridge for connecting to external wires, and the raw material of the lead frame is a copper strip. During the production process of the lead frame, it is first necessary to perform a laminating operation on the copper strip.

[0003] In the prior art, when laminating a copper strip, hot pressing is generally used for laminating. For example, a double-pressure-wheel laminating system for a copper strip of a lead frame with the application number 201920772482.0 performs two hot presses on the front and back of the copper strip by setting two sets of upper pressure wheel mechanisms and lower pressure wheel mechanisms, improving the hot pressing efficiency. However, during the laminating process of the copper strip of the lead frame, gas cannot be completely discharged during the two hot presses, forming bubbles, which in turn affects conductivity. In addition, bubbles are also generated due to reasons such as residual raw material gas, gas generated by oxidative decomposition, and improper process parameters.

[0004] To solve the above technical problems, the present invention discloses a double-pressure-wheel laminating device for a copper strip of a lead frame, which has the advantages of removing bubbles through a scraping device after the laminating is completed by setting the scraping device. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double-pressure-wheel laminating device for a copper strip of a lead frame to solve the technical problems in the prior art that gas cannot be completely discharged during the laminating process of the copper strip of the lead frame, forming bubbles, which in turn affects conductivity. In addition, bubbles are also generated due to reasons such as residual raw material gas, gas generated by oxidative decomposition, and improper process parameters. The present invention has the advantages of removing bubbles through a scraping device after the laminating is completed by setting the scraping device.

[0006] The present invention is realized through the following technical solutions: The present invention discloses a double-pressure-wheel laminating device for a copper strip of a lead frame, including hot pressing wheels, two sets of which are provided for hot pressing and laminating the copper strip and the film; A winding device for winding the laminated copper strip; A scraping mechanism is arranged between the hot pressing wheels and the winding device, and two scraping mechanisms are provided and are symmetrically arranged up and down; The scraping mechanism includes: two horizontally arranged pressing rollers; The driving component drives the pressure roller to reciprocate in the vertical direction perpendicular to the copper strip conveying direction, and the displacement distance of the pressure roller is greater than half of the width of the copper strip, so that the scraping area covers more than half of the copper strip; The lifting control part realizes the alternating lifting of the pressure roller through the cooperation of the guiding groove and the guiding wheel, and specifically includes: The fixed seat is internally provided with a guiding groove whose two end groove walls are inclined surfaces and vertical surfaces respectively; The guiding wheel contacts the guiding groove and triggers the rising action on the inclined surface when moving horizontally with the pressure roller; The spring and the swing plate, the spring is used for the descending reset of the pressure roller, and the swing plate is used for guiding the pressure roller to maintain the height and move horizontally after rising; The pressure wheel assembly is arranged between the scraping mechanism and the winding device to keep the copper strip horizontal and prevent the copper strip from tilting due to the change of the winding wheel diameter.

[0007] Further, the pressure roller of the scraping mechanism is connected to the lifting table, the lifting table is driven by an electric push rod to move horizontally, and the two lifting tables move synchronously through the connecting plate, and the moving stroke covers the width direction of the copper strip.

[0008] Further, the lifting table includes a base, a lifting plate is arranged above the base, and a sliding rod is arranged between the lifting plate and the base for longitudinal movement limit. A connecting rod is fixedly arranged at the bottom of the lifting plate, and the guiding wheel is arranged at the bottom end of the connecting rod.

[0009] Further, the bottom wall of the guiding groove of the lifting control part is a horizontal plane, one end of the guiding groove is an inclined surface, the starting point of the inclined surface is the lowest point and is connected to the horizontal plane, and the other end of the guiding groove is a vertical plane. When the guiding wheel moves along the inclined surface, it drives the connecting rod and the lifting plate to rise, so that the pressure roller is separated from the copper strip. When the guiding wheel enters the vertical plane end, the spring pushes the lifting plate to descend, so that the pressure roller contacts the copper strip.

[0010] Further, the swing plate is connected to the guiding plate through a pin shaft, and the swing plate can only swing upward. Its inclined end face fits with the inclined wall of the guiding groove, and the reset is realized through a torsion spring.

[0011] Further, two fixed seats are horizontally arranged, and the two fixed seats are symmetric front and back. Through the symmetric guiding grooves of the front and back two fixed seats, the two horizontally arranged pressure rollers can alternately scrape the copper strip.

[0012] Further, the reciprocating movement of the pressure roller realizes bubble scraping in the following way: The front pressure roller moves from the rear end of the copper strip center line to the front end edge, merges with the lower pressure roller to extrude bubbles, and the upper and lower pressure rollers at the rear side are separated from the copper strip and move from the rear end edge of the copper strip towards the center line; The rear pressing roller moves from the front end of the center line of the copper strip to the rear end edge, merges with the lower pressing roller to extrude air bubbles, and the upper and lower pressing rollers at the front side separate from the copper strip and move from the front end edge of the copper strip towards the center line.

[0013] Furthermore, the pressing wheel assembly includes a pressing wheel group with adjustable height, and the horizontal degree of the copper strip is adjusted by longitudinal movement.

[0014] The present invention has the following advantages: By setting the scraping mechanism in the present invention, when it is necessary to scrape air bubbles, the electric push rod is started, and the electric push rod reciprocates, so that the combined pressing rollers can be controlled to scrape the copper strip, and the air bubbles generated after pressing the film are extruded from the edge of the copper strip. Moreover, two groups of pressing rollers are horizontally arranged, and the two groups of pressing rollers alternately scrape the copper strip respectively. The two groups of pressing rollers start from the center line position of the copper strip and move to the edge of the copper strip, and the air bubbles in the pressed film are extruded from the edge, so that the scraping of the air bubbles can be carried out automatically, and the setting of the two groups of pressing rollers can improve the scraping efficiency. Description of the Drawings

[0015] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is for the present invention Figure 1 partial enlarged structural schematic diagram at A; Figure 3 is the structural schematic diagram of the driving component of the present invention; Figure 4 is the structural schematic diagram of the lifting platform of the present invention; Figure 5 is the structural schematic diagram of the fixed seat of the present invention; Figure 6 is for the present invention Figure 5 partial enlarged structural schematic diagram at B; Figure 7 is the front structural schematic diagram of the lifting platform of the present invention.

[0016] In the figure: 1, hot pressing wheel; 2, winding equipment; 3, scraping mechanism; 4, support frame; 5, connecting plate; 6, connecting rod; 7, guide wheel; 8, bottom plate; 9, support plate; 10, swing plate; 11, positioning disc; 12, spring; 13, pressing wheel assembly; 301, pressing roller; 302, driving component; 321, slide rail; 322, lifting platform; 323, lifting control part; 324, electric push rod; 221, base; 222, lifting plate; 223, sliding rod; 231, fixed seat; 232, guide groove; 233, guide plate. Detailed Embodiment

[0017] The embodiments of the present invention will be described in detail below. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. In the description of the present invention, words indicating orientation or positional relationship such as "front", "rear", "left", and "right" are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] The embodiment discloses a double-pressure-wheel film pressing device for a copper strip of a lead frame. As Figures 1-7 shown, it includes two hot pressing wheels 1. Both the copper strip and the film are unwound by unwinding devices. After unwinding, they are film-pressed by the two hot pressing wheels 1. After the film pressing is completed, they are wound by a winding device 2. This is the prior art, so it will not be described in detail in this embodiment.

[0019] After the film pressing is completed, due to reasons such as residual raw material gas, gas generated by oxidative decomposition, and improper process parameters, bubbles may be generated, and the bubbles will affect the electrical conductivity. Furthermore, as Figure 1 shown, in this embodiment, a scraping mechanism 3 is also provided to scrape off the bubbles generated during the film pressing.

[0020] Specifically, as Figure 1 shown, the scraping mechanism 3 is arranged between the hot pressing wheel 1 and the winding device 2. In other words, after the film pressing step is completed and before winding, the copper strip is scraped to remove the bubbles.

[0021] More specifically, as Figure 1 and Figure 2 shown, there are two scraping mechanisms 3. The two scraping mechanisms 3 are arranged symmetrically above and below the copper strip, and then the bubbles on the film above and below the copper strip are scraped off by the scraping mechanisms 3 arranged up and down. Support frames 4 are also arranged at the front end and the rear end of the copper strip to support and fix the scraping mechanism 3. The upper and lower two groups of scraping mechanisms 3 are both arranged between the two support frames 4.

[0022] The scraping mechanism 3 includes a pressing roller 301 and a driving component 302. The pressing roller 301 reciprocates along the vertical direction of the copper strip conveying direction, that is, along the width direction of the copper strip, so as to scrape off the bubbles on the film on the copper strip and make the gas of the bubbles discharge from the side of the copper strip; It should be noted that in this embodiment, as Figures 1-3 shown, there are two groups of pressing rollers 301, and the two groups of pressing rollers 301 are arranged front and back along the width direction of the copper strip.

[0023] In addition, in this embodiment, in order to further improve the comprehensiveness of the scraping of the scraping mechanism 3, when the pressure roller 301 is scraped by the driving of the driving component 302, the scraping area is expanded to more than half of the copper strip. Specifically, the displacement distance of the pressure roller 301 is greater than half of the width of the copper strip, and the two groups of pressure rollers 301 move synchronously. Further, the scraping starting point of the front pressure roller 301 is set at a point at the rear end of the center line of the copper strip, and the scraping starting point of the rear pressure roller 301 is set at a point at the front end of the center line of the copper strip, and the two groups of pressure rollers 301 scrape alternately. Thus, each pressure roller 301 can cover more than half of the width of the copper strip during scraping. Through the reciprocating movement of the front and rear two groups of pressure rollers 301, the entire copper strip can be comprehensively covered.

[0024] It should also be noted that when the pressure roller 301 is scraping, when the pressure roller 301 moves from the center line position of the copper strip towards its edge position, at this time, the two pressure rollers 301 need to be combined to extrude the bubble gas. And when the pressure roller 301 moves towards the center line position of the copper strip, in order to avoid the bubbles being scraped back to the center position, the two pressure rollers 301 need to be separated to increase the distance between them, and the pressure roller 301 is separated from the copper strip to stop scraping, and so on for reciprocating movement.

[0025] Specifically, as Figures 1-3 shown, the driving component 302 includes a slide rail 321, a lifting table 322, a lifting control part 323 and an electric push rod 324. Among them, there is a set of slide rails 321. A set of slide rails 321 includes two slide rails 321. The two slide rails 321 are arranged horizontally and in parallel. The two slide rails 321 are connected by a bottom plate 8. The two ends of the two slide rails 321 are respectively fixedly connected to the support frame 4. And a lifting table 322 is slidably arranged on the slide rail 321. The pressure roller 301 is connected to the lifting table 322, and the pressure roller 301 performs lifting activities through the lifting table 322. And the lifting of the lifting table 322 is driven by the lifting control part 323. Specifically, the lifting of the lifting table 322 is controlled by the horizontal movement of the lifting table 322. The horizontal movement of the lifting table 322 is driven by the electric push rod 324. And the electric push rod 324 is installed on the support frame 4. The telescopic shaft of the electric push rod 324 is connected to the lifting table 322 to control the horizontal movement of the lifting table 322.

[0026] It should be noted that there are two lifting tables 322 on a set of slide rails 321. The two pressure rollers 301 are respectively connected to the two lifting tables 322. The two lifting tables 322 are connected by a connecting plate 5. The stroke of the electric push rod 324 is greater than half of the width of the copper strip.

[0027] As Figures 1-4As shown in the figure, the lifting table 322 includes a base 221, a lifting plate 222, and sliding rods 223. Among them, sliders are fixedly arranged at the bottom of the base 221, and the sliders are slidably engaged with the slide rails 321, so that the base 221 can slide on the slide rails 321. And through the setting of the linear slide rails 321, the moving accuracy of the pressure roller 301 can be improved. Above the base 221, there is a lifting plate 222, and sliding rods 223 are fixedly arranged at the bottom of the lifting plate 222. There are at least two sliding rods 223. In this embodiment, four sliding rods 223 are arranged. The four sliding rods 223 are distributed at the four corners of the bottom of the lifting plate 222. The bottom ends of the sliding rods 223 slide through the base 221 and extend to the bottom of the slide rails 321. The pressure roller 301 is fixedly connected to the sliding rods 223, so that the pressure roller 301 can be lifted by the lifting of the lifting plate 222.

[0028] The telescopic shaft of the electric push rod 324 is fixedly connected to the base 221, and both ends of the connecting plate 5 are fixedly connected to the two bases 221 respectively. Therefore, when one of the bases 221 moves, the other base 221 will move synchronously.

[0029] The lifting of the lifting plate 222 is controlled by the lifting control part 323. Specifically, as Figure 4 and Figure 7 shown in the figure, a connecting rod 6 is movably inserted into the base 221. The top end of the connecting rod 6 is fixedly connected to the lifting plate 222. A guide wheel 7 is rotatably arranged at the bottom end of the connecting rod 6. When the base 221 moves, the lifting control part 323 guides the guide wheel 7 to lift it.

[0030] It should be noted that there are two lifting control parts 323, and the two lifting control parts 323 are symmetrically arranged front and back, so that the pressure rollers 301 of the two lifting tables 322 can be lifted alternately.

[0031] As Figure 3 、 Figure 5 and Figure 6 shown in the figure, the lifting control part 323 includes a fixed seat 231, a guide groove 232, and a guide plate 233. Among them, a fixed seat 231 is also arranged between the two slide rails 321, and the fixed seat 231 is fixedly connected to the support frame 4. A guide groove 232 is opened in the fixed seat 231 along its length direction. The guide wheel 7 is in contact with the guide groove 232. Through the guidance of the guide groove 232, the base 221 can be lifted when moving along the width direction of the copper strip; The guiding groove 232 penetrates through the top surface of the fixed seat 231. The bottom wall of the guiding groove 232 is a horizontal plane. One end of the guiding groove 232 is an inclined surface, and the other end is a vertical surface. The inclined surface is set to start from the lowest point and extend upward from the bottom wall of the guiding groove 232. The guiding wheel 7 contacts the bottom wall of the guiding groove 232. When the base 221 moves horizontally along the width direction of the copper strip, through the contact between the guiding wheel 7 and the guiding groove 232, the guiding wheel 7 can be guided by the inclined wall and rise when moving to the inclined end. The guiding wheel 7 drives the connecting rod 6 to rise, and then the lifting plate 222 rises.

[0032] It should be noted that when the guiding wheel 7 contacts the bottom wall of the guiding groove 232, the pressing roller 301 will be in contact with the copper strip and have a downward pressure.

[0033] After the pressing roller 301 finishes scraping and moves back towards the midline of the copper strip, the pressing roller 301 needs to rise to avoid contacting the copper strip. Therefore, through the setting of the guiding groove 232, when the pressing roller 301 moves out of the range of the copper strip after finishing scraping, the pressing roller 301 rises. Then, when it moves back to the midline of the copper strip during reset, in order to maintain the height of the pressing roller 301, as Figure 5 and Figure 6 shown, a guiding plate 233 is arranged above the guiding groove 232. The guiding plate 233 is above the bottom wall of the guiding groove 232. One end of the guiding plate 233 facing the vertical surface of the guiding groove 232 has a spacing from the vertical surface, and the spacing is greater than the diameter of the guiding wheel 7, so that the guiding wheel 7 can move down to the bottom wall of the guiding groove 232 through this spacing when moving to the vertical surface end of the guiding groove 232. One end of the guiding plate 233 facing the inclined end of the guiding groove 232 is provided with a swing plate 10 that can swing, and one end of the swing plate 10 is in contact with the inclined wall.

[0034] One end of the swing plate 10 is rotatably connected to the guiding plate 233 through a pin shaft. And one end of the swing plate 10 in contact with the inclined wall of the guiding groove 232 is also an inclined end face and they are in contact with each other. Thus, the swing plate 10 can only swing upward. When it swings downward, it will be limited by the inclined wall of the guiding groove 232 and cannot swing downward. Additionally, it should be noted that both the swing plate 10 and the guiding plate 233 are horizontally arranged, and their top surfaces are on the same horizontal plane. A torsion spring can also be arranged at the pin shaft to rebound the swing plate 10 downward, so that after the swing plate 10 swings upward, it can quickly reset under the action of the torsion spring and remain horizontal again.

[0035] In addition, a support plate 9 is fixed to the bottom of the guiding plate 233, and the support plate 9 is fixedly connected to the bottom plate 8. As Figure 7 shown, a positioning disk 11 is fixedly sleeved outside a section of the connecting rod 6 below the base 221. A spring 12 is arranged between the positioning disk 11 and the base 221, and the spring 12 is sleeved outside the connecting rod 6, thereby rebounding the lifting plate 222 downward.

[0036] It should be noted that when the guide wheel 7 is above the guide plate 233, the lifting plate 222 rises at this time, and the pressure roller 301 will rise accordingly. The pressure roller 301 separates from the copper strip and maintains a distance.

[0037] In actual operation, when winding the copper strip, due to the increase in the winding wheel diameter, the height of one end of the copper strip being wound will change. When the height of one end of the winding line changes, it will affect the flatness of the copper strip in the scraping section. In order to keep the copper strip in the scraping section horizontal and avoid affecting its scraping effect, as Figure 1 shown, a pressure wheel assembly 13 is provided between the scraping mechanism 3 and the winding device 2. The pressure wheel group on the pressure wheel assembly 13 can be adjusted longitudinally, so that the copper strip in the scraping section is kept horizontal through the pressure wheel assembly 13.

[0038] The principle of the present invention is as follows: When the present invention needs to perform bubble scraping, the electric push rod 324 is started to make the electric push rod 324 reciprocate. The electric push rod 324 drives two lifting platforms 322 arranged along the width direction of the copper strip to move synchronously, and the movement of the lifting platform 322 is greater than half the width of the copper strip. When the lifting platform 322 moves, through the contact between the guide wheel 7 and the bottom wall of the guide groove 232, when one of the guide wheels 7 of the two lifting platforms 322 moves to the inclined end of the guide groove 232 and rises through the guidance of the inclined end, since there are two fixed seats 231 and the two fixed seats 231 are symmetrically arranged front and back, the guide wheel 7 of the other lifting platform 322 will move to the vertical plane of the guide groove 232 of this fixed seat 231. Through the action of the spring 12, it moves down from the distance between the guide plate 233 and the vertical plane, so that this pressure roller 301 moves down to contact the copper strip, while the other pressure roller 301 rises and separates from the copper strip. Then, during the movement, the downward pressure roller 301 contacts the copper strip to perform bubble scraping on it, while the other pressure roller 301 separates from the copper strip, and thus the copper strip is alternately subjected to bubble scraping.

[0039] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A double-pressure-wheel film pressing device for a copper strip of a lead frame, including a hot pressing wheel (1), characterized in that, The hot pressing wheels (1) are provided in two groups and are used for hot pressing and laminating the copper strip and the film. The winding device (2) is used for winding the copper strip after film pressing. The scraping mechanism (3) is arranged between the hot pressing wheel (1) and the winding device (2), and two scraping mechanisms (3) are provided and are symmetrically arranged up and down. The scraping mechanism (3) includes: two horizontally arranged pressing rollers (301). The driving component (302) drives the pressing roller (301) to reciprocate in the vertical direction of the copper strip conveying direction, and the displacement distance of the pressing roller (301) is greater than half of the width of the copper strip, so that the scraping area covers more than half of the copper strip. The lifting control part (323) realizes the alternating lifting of the pressing roller (301) through the cooperation of the guide groove (232) and the guide wheel (7). Specifically, it includes: The fixed seat (231) is internally provided with a guide groove (232) whose two end walls are inclined surfaces and vertical surfaces respectively. The guide wheel (7) contacts the guide groove (232) and triggers an upward movement on the inclined surface when moving horizontally along with the pressing roller (301). The spring (12) and the swing plate (10), the spring (12) is used for the downward reset of the pressing roller (301), and the swing plate (10) is used for guiding the pressing roller (301) to maintain the height and move horizontally after rising. The pressing wheel assembly (13) is arranged between the scraping mechanism (3) and the winding device (2) and is used to keep the copper strip horizontal to avoid the copper strip tilting due to the change of the winding wheel diameter.

2. The double-pressure-wheel film pressing device for the copper strip of a lead frame according to claim 1, characterized in that, The pressing roller (301) of the scraping mechanism (3) is connected to the lifting table (322), and the lifting table (322) is driven by an electric push rod (324) to move horizontally, and the two lifting tables (322) move synchronously through the connecting plate (5), and the moving stroke covers the width direction of the copper strip.

3. The double-pressure-wheel film pressing device for the copper strip of a lead frame according to claim 2, characterized in that, The lifting table (322) includes a base (221), an elevating plate (222) is arranged above the base (221), and a sliding rod (223) is arranged between the elevating plate (222) and the base (221) for longitudinal movement limit. A connecting rod (6) is fixedly arranged at the bottom of the elevating plate (222), and the guide wheel (7) is arranged at the bottom end of the connecting rod (6).

4. The double-pressure-wheel film pressing device for the copper strip of a lead frame according to claim 1, characterized in that, The bottom wall of the guide groove (232) of the lifting control part (323) is a horizontal plane, one end of the guide groove (232) is an inclined surface, the starting point of the inclined surface is the lowest point and is connected to the horizontal plane, and the other end of the guide groove (232) is a vertical surface. When the guide wheel (7) moves along the inclined surface, it drives the connecting rod (6) and the elevating plate (222) to rise, so that the pressing roller (301) is separated from the copper strip. When the guide wheel (7) enters the vertical surface end, the spring (12) pushes the elevating plate (222) to descend, so that the pressing roller (301) contacts the copper strip.

5. The double-pressure-wheel film pressing device for the copper strip of a lead frame according to claim 1, wherein The swing plate (10) is connected to the guide plate (233) through a pin shaft, and the swing plate (10) can only swing upward, and its inclined end face fits with the inclined wall of the guide groove (232), and the reset is realized through a torsion spring.

6. The double-pressure-wheel film pressing device for the copper strip of the lead frame according to claim 1, characterized in that, There are two horizontally arranged fixing seats (231), and the two fixing seats (231) are symmetrically arranged front and back. Through the symmetrically arranged guide grooves (232) of the front and back fixing seats (231), the two horizontally arranged pressure rollers (301) can alternately scrape the copper strip.

7. The double-pressure-wheel film pressing device for the copper strip of the lead frame according to claim 1, characterized in that, The reciprocating movement of the pressure roller (301) realizes bubble scraping in the following way: The front pressure roller (301) moves from the rear end to the front end edge of the center line of the copper strip, merges with the lower pressure roller (301) to extrude bubbles, and the upper and lower pressure rollers (301) on the rear side separate from the copper strip and move from the rear end edge of the copper strip towards the center line; The rear pressure roller (301) moves from the front end to the rear end edge of the center line of the copper strip, merges with the lower pressure roller (301) to extrude bubbles, and the upper and lower pressure rollers (301) on the front side separate from the copper strip and move from the front end edge of the copper strip towards the center line.

8. The double-pressure-wheel film pressing device for the copper strip of a lead frame according to claim 1, characterized in that, The pressure wheel assembly (13) includes a pressure wheel group with adjustable height, and the horizontal degree of the copper strip is adjusted by longitudinal movement.

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