Feeding device for switchable high-density integrated circuit lead frame conveying mode

Abstract

The utility model relates to lead frame feeding equipment technical field, especially the feeding device of switchable high density integrated circuit lead frame conveying mode, including having support platform and setting in the support platform's feeding frame body, the feeding frame body is along the length direction and is provided with the band conveying spare of the removal of the lead frame of the pile, and the band conveying spare includes a plurality of interval arrangement in the belt conveying spare of feeding frame body, and the front end of feeding frame body is the feeding station of the feeding of lead frame, the support platform is provided with the movable plate that can be transversely active to the direction close to or away from the feeding station, and the movable plate is equipped with conveying roller assembly, the movable plate drives conveying roller assembly to move to the feeding station, and the end of conveying roller assembly and transport assembly is connected to convey the lead frame to the feeding station piece by piece. Two kinds of conveying modes can be switched freely to adapt to different feeding modes, improve the conveying efficiency and adaptability of the feeding device.

Description

Technical Field

[0001] This utility model relates to the technical field of lead frame feeding equipment, and in particular to a feeding device with switchable high-density integrated circuit lead frame conveying mode. Background Technology

[0002] In the field of high-density integrated circuit manufacturing, leadframes serve as a crucial carrier for chip packaging, and the efficiency and stability of their feeding directly impact the production capacity and quality of the packaging process. Existing technologies typically employ a single feeding method, such as continuous transport of stacked leadframes via belt conveyors or wafer-by-wafer transport via roller assemblies, with these two methods set up separately. When production scenarios require switching between "stacked feeding" and "intermittent wafer-by-wafer feeding" modes, existing mechanisms often necessitate the use of two separate devices, severely impacting production efficiency. Furthermore, mechanisms using belt conveyors struggle to precisely control the feeding rhythm of individual wafers, while mechanisms relying solely on roller conveyors cannot efficiently handle stacked materials, resulting in poor adaptability of the equipment to different production processes.

[0003] Therefore, a feeding device with a switchable high-density integrated circuit lead frame conveying mode is provided to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a feeding device with a switchable high-density integrated circuit lead frame feeding mode to address the shortcomings of existing technologies, thereby solving the technical problem that the feeding mode of existing lead frame feeding devices is relatively simple.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A feeding device with switchable high-density integrated circuit lead frame conveying mode includes a support platform and a feeding frame set on the support platform. The feeding frame is provided with a belt conveyor along its length to transfer the stacked lead frames. The belt conveyor includes multiple belt conveyors arranged at intervals in the feeding frame. The front end of the feeding frame is a feeding station for feeding the lead frames. The support platform is equipped with a lifting component located directly below the feeding station for intermittently lifting the stacked lead frames. The support platform is equipped with a steel bar conveying mechanism for clamping and conveying the lead frames, and also with a flipping clamping mechanism for feeding the lead frames placed at the feeding station to the steel bar conveying mechanism.

[0007] The support platform is equipped with a movable plate that can move laterally towards or away from the loading station. The direction of movement of the movable plate is consistent with the length direction of the loading frame. The movable plate is equipped with a conveyor roller assembly for supporting and laterally conveying single lead frame pieces, and the conveying direction of the conveyor roller assembly is perpendicular to the conveying direction of the belt conveyor. A material conveying assembly is provided on the side of the loading frame for intermittently conveying the lead frame pieces one by one. When the movable plate drives the conveyor roller assembly to the loading station, the end of the conveyor roller assembly connects with the end of the material conveying assembly to convey the lead frame pieces one by one to the loading station. The support platform is equipped with a material box lifting assembly for feeding the lead frame pieces one by one, and the material box lifting assembly connects with the beginning of the material conveying assembly.

[0008] The beneficial effects of this utility model are as follows: When feeding is required, a pile of lead frames is placed at the rear of the feeding frame. Then, multiple belt conveyors move the pile of lead frames to the front of the feeding frame. Next, the lifting assembly is operated. The lifting end of the lifting assembly passes through the belt conveyors from bottom to top, lifting the pile of lead frames to the feeding station, so that the pile of lead frames is separated from the ends of the multiple belt conveyors. After the pile of lead frames is lifted to a specified height and placed at the feeding station, the flipping clamping mechanism is operated to flip the lead frames and feed them onto the steel bar conveying mechanism. Each time a lead frame is removed, the lifting assembly will lift the pile of lead frames a certain distance (this distance is consistent with the thickness of a lead frame), so that the flipping clamping mechanism can be aligned with the topmost lead frame. The above feeding process is repeated to continuously feed the lead frames.

[0009] When the conveyor belt and lifting assembly work together to lift and feed stacked lead frames, the conveyor roller assembly is positioned outside the feeding frame, and both the conveyor roller assembly and the conveying assembly are in a stopped state. When the conveyor belt and lifting assembly are stopped, the control plate moves laterally towards the feeding station, moving to the front of the feeding frame and placing it at the feeding station. Simultaneously, the conveyor roller assembly connects to the end of the conveying assembly, and the material box lifting assembly, conveying assembly, and conveyor roller assembly operate simultaneously. The conveying assembly transports the lead frames piece by piece intermittently. When a single lead frame is transported to the conveyor roller assembly, the conveyor roller assembly supports the lead frame while accurately conveying it to the feeding station for the flipping clamping mechanism to pick up and feed it. These two conveying methods can be freely switched to adapt to different feeding methods (i.e., stacked feeding of lead frames or intermittent feeding of individual frames), improving the conveying efficiency and adaptability of this feeding device. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 2This is a schematic diagram of the conveying part of this utility model.

[0012] Figure 3 This is a schematic diagram of the material box lifting assembly of this utility model.

[0013] Figure 4 This is a schematic diagram of the conveyor roller assembly of this utility model.

[0014] Figure 5 This is a schematic diagram of the material lifting assembly of this utility model.

[0015] Figure 6 This is a schematic diagram of the material conveying component of this utility model.

[0016] Figure 7 This is a schematic diagram of the structure of the first limiting wheel assembly of this utility model.

[0017] Figure 8 This is a schematic diagram of the structure of the long side adjustment component of this utility model.

[0018] Figure 9 This is a schematic diagram of the structure of the wide-side adjustment component of this utility model.

[0019] Figure 10 This is a schematic diagram of the lifting module of this utility model.

[0020] Figure 11 This is a partial structural diagram of the lifting module of this utility model.

[0021] Figure 12 This is a schematic diagram of the material box and the box opening module of this utility model.

[0022] The reference numerals in the figures include:

[0023] 1. Support platform; 2. Loading frame; 201. First positioning rod; 202. Feeding slot; 203. Perforation; 3. Belt conveyor; 4. Loading station; 5. Lifting assembly; 51. Fixed frame; 52. Lifting frame; 53. Fifth servo motor; 54. First threaded rod; 55. Material support block; 6. Moving plate; 601. First control component; 7. Conveyor roller assembly; 71. Support base; 72. Conveyor roller; 73. Drive shaft; 74. Bevel gear assembly; 75. First drive component;

[0024] 8. Material conveying assembly; 81. Fixed plate; 82. Movable plate; 83. First conveyor pulley; 84. Second conveyor pulley; 85. Conveyor belt; 86. Tensioner module; 87. Splined shaft; 88. Second drive component; 89. Second threaded rod; 810. Third drive component; 811. First limit wheel assembly; 8111. Rotating shaft; 8112. Swing arm; 8113. Rotating rod; 8114. Limit wheel; 8115. Adjusting cylinder; 8116. First fixing component; 8117. Movable hinge component; 8118. First transmission gear; 8119. Rotating bushing; 81110. Second transmission gear; 81111. Transmission toothed belt; 81112. Transmission gear set; 812. Second limit wheel assembly; 813. Support plate;

[0025] 9. Long side adjustment assembly; 91. First slide rail; 92. First slider; 93. Second slider; 94. First push cylinder; 95. Second control component; 97. First push rod; 98. Fixing pin; 99. Pushing part; 910. Slide groove; 911. Control cylinder; 912. Slide rod; 10. Wide side adjustment assembly; 101. Second slide rail; 102. Third slider; 103. Fourth slider; 104. Second push cylinder; 105. Third control component; 106. Second push rod; 11. Material support fork;

[0026] 12. Support frame; 13. Lifting module; 131. Horizontal plate; 132. Lifting frame; 133. Lifting platform; 134. First servo motor; 135. Third threaded rod; 136. Fixed limit plate; 137. Movable limit plate; 138. Third push cylinder; 139. Push block; 1310. Connecting frame; 1311. Second servo motor; 1312. Fourth threaded rod; 1313. Push rod; 1314. Second positioning rod; 1315. Third servo motor; 1316. Transmission components; 1317. 13. Third threaded rod; 14. Fixing block; 15. Material box; 16. Material box body; 17. Material discharge chute; 18. Upper rotating part; 19. Lower rotating part; 10. Material stop rod; 11. Second fixing part; 12. Spring; 13. Fourth servo motor; 14. Fourth threaded rod; 15. Box opening module; 16. Rotary cylinder; 17. Actuating part; 18. Placement slot; 19. Support platform; 20. Film peeling assembly; 21. Flipping clamping mechanism; 22. Steel bar conveying mechanism; 23. Material kicking assembly. Detailed Implementation

[0027] The following is a detailed description of the feeding device for switchable high-density integrated circuit lead frame conveying mode of this utility model, with reference to the accompanying drawings.

[0028] like Figure 1-2As shown, an embodiment of the feeding device for switchable high-density integrated circuit lead frame conveying mode of this utility model includes a support platform 18 and a support platform 1 installed on the support platform 18. The support platform 1 is provided with a feeding frame 2. The feeding frame 2 is provided with belt conveyors for conveying the stacked lead frames along its length. The belt conveyors include multiple belt conveyors 3 arranged at intervals in the feeding frame 2. The spacing between two adjacent belt conveyors 3 is the same. The width of the feeding frame 2 is greater than the length of the lead frame. The stacked lead frames are placed at the tail of the feeding frame 2, that is, at the beginning of the multiple belt conveyors 3, and are moved forward by the multiple belt conveyors 3 to the front of the feeding frame 2, that is, to the end of the multiple belt conveyors 3.

[0029] The front end of the feeding frame 2 is a feeding station 4 for feeding lead frames. The support platform 1 is equipped with a lifting component 5 located directly below the feeding station 4 for intermittently lifting the piled lead frames. The support platform 18 is equipped with a steel bar conveying mechanism 21 for clamping and conveying the lead frames, and also with a flipping clamping mechanism 20 for feeding the lead frames placed at the feeding station 4 to the steel bar conveying mechanism 21. It is also equipped with a film peeling component 19 located on the side of the feeding frame 2 and capable of reciprocating movement.

[0030] Specifically, in the stack of lead frames, each lead frame's upward-facing surface is covered with a protective film to prevent scratches and to prevent particles or dust from falling onto the lead frame surface and causing quality problems. When loading is required, the stack of lead frames is placed at the rear of the loading frame 2. Then, multiple belt conveyors 3 move the stack of lead frames to the front of the loading frame 2. Next, the lifting assembly 5 is activated. The lifting end of the lifting assembly 5 passes through the belt conveyors from bottom to top, lifting the stack of lead frames to the loading station 4, thus detaching the stack of lead frames from the ends of the multiple belt conveyors 3. After the stack of lead frames is lifted to the designated height and placed at the loading station 4, the loading process... The film-removing assembly 19 removes the protective film from the surface of the topmost lead frame, and then the flipping clamping mechanism 20 flips the lead frame onto the steel bar conveying mechanism 21. Each time a lead frame is removed, the lifting assembly 5 lifts the stack of lead frames a certain distance (the distance is consistent with the thickness of a lead frame), so that the flipping clamping mechanism 20 and the film-removing assembly 19 are aligned with the topmost lead frame. The above feeding process is repeated to continuously feed the lead frames.

[0031] Among them, the film peeling component 19, the flipping clamping mechanism 20 and the steel bar conveying mechanism 21 are all existing structures. For details of the specific structure, please refer to the conductive shielding device of the high-density integrated circuit lead frame equipment with patent number CN20231018363.5. The existing conductive shielding device of the high-density integrated circuit lead frame equipment discloses the specific structure of the film peeling component 19, the flipping clamping mechanism 20 and the steel bar conveying mechanism 21, which will not be described in detail here.

[0032] Several vertically arranged first positioning rods 201, which pass through the conveyor belt, are provided at the rear of the feeding frame 2. These first positioning rods 201 are arranged in an array along the width direction of the feeding frame 2. After the stack of lead frames is placed into the rear of the feeding frame 2, the long side of the stack of lead frames is aligned with the array of first positioning rods 201, thereby positioning the stack of lead frames. Then, the stack of lead frames can be accurately transferred to the feeding station 4 by the conveyor belt.

[0033] In this embodiment, the support platform 1 is provided with a movable plate 6 that can move laterally towards or away from the loading station 4, and a first control component 601 for controlling the movement of the movable plate 6. The movement direction of the movable plate 6 is consistent with the length direction of the loading frame 2. The movable plate 6 is equipped with a conveying roller assembly 7 for supporting and laterally conveying single lead frames, and the conveying direction of the conveying roller assembly 7 is perpendicular to the conveying direction of the belt conveyor 3. A material conveying component 8 for intermittently transporting lead frames piece by piece is provided on the side of the loading frame 2. When the movable plate 6 drives the conveying roller assembly 7 to the loading station 4, the end of the conveying roller assembly 7 is connected to the end of the material conveying component 8 to transport the lead frames piece by piece to the loading station 4. The support platform 18 is equipped with a material box lifting component for feeding lead frames piece by piece, and the material box lifting component is connected to the beginning end of the material conveying component 8.

[0034] When the conveyor belt and lifting assembly 5 work together to lift and feed the stacked lead frames, the conveyor roller assembly 7 is placed outside the feeding frame 2, and the conveyor roller assembly 7 and the conveying assembly 8 are in a stopped state. When the conveyor belt and lifting assembly 5 are in a stopped state, the first control unit 601 controls the moving plate 6 to move laterally towards the feeding station 4, so that it moves to the front end of the feeding frame 2 and is placed at the feeding station 4. At the same time, the conveyor roller assembly 7 and the end of the conveying assembly 8 are connected. The material box lifting assembly, the conveying assembly 8 and the conveyor roller assembly 7 operate simultaneously. The conveying assembly 8 transports the lead frames piece by piece and intermittently. When a single lead frame is transported to the conveyor roller assembly 7, the conveyor roller assembly 7 supports the lead frame and can also accurately transport it to the feeding station 4 for the flipping clamping mechanism 20 to pick up and feed the piece. The two conveying methods mentioned above can be freely switched to adapt to different feeding methods (i.e., feeding the lead frame in batches or feeding it piece by piece intermittently), thereby improving the conveying efficiency and adaptability of this feeding device.

[0035] In this embodiment, the feeding frame 2 is equipped with a long side adjustment component 9 for adjusting the position of the long side of the lead frame placed at the feeding station 4, and a wide side adjustment component 10 for adjusting the position of the wide side of the lead frame placed at the feeding station 4. When the lifting component 5 lifts a stack of lead frames to the feeding station 4, or when the conveying roller component 7 conveys a single lead frame to the feeding station 4, operating the long side adjustment component 9 and the wide side adjustment component 10 can push the lead frame to the execution end aligned with the outer feeding robot, enabling it to accurately pick up and feed the lead frame, thus improving the accuracy and efficiency of the feeding process.

[0036] A material support fork 11 is laterally and movably provided on the inner side of the top of the feeding frame 2 to support the remaining lead frame on the lifting assembly 5 (e.g., Figure 9 As shown, the movement direction of the material-supporting fork 11 is parallel to the conveying direction of the conveyor belt. When the pile of lead frames on the lifting assembly 5 is almost empty (5-6 pieces remaining), the material-supporting fork 11 is controlled to move towards the loading station 4 to insert into the bottom of the remaining lead frames. Then, the lifting assembly 5 is controlled to return to its original position. The remaining lead frames are held by the material-supporting fork 11 and can still be picked up and loaded by the loading robot. At the same time, the conveyor belt can transport the next pile of lead frames to the top of the lifting assembly 5 for subsequent lifting, achieving uninterrupted conveying.

[0037] like Figure 3As shown, the material box lifting assembly includes a support frame 12 and several lifting modules 13. The support frame 12 is mounted on a support platform 18. At least two lifting modules 13 are provided, each laterally movable within the support frame 12. The lifting modules 13 are used to drive the material box 14, which contains the lead wire frame, to move vertically and laterally. Each lifting module 13 is controlled separately. The material box lifting assembly also includes a kicking component 22 (e.g., for kicking the lead wire frames inside the material box 14 one by one onto the conveying component 8) Figure 1 (As shown).

[0038] Specifically, after placing multiple material boxes 14 loaded with lead frames at designated positions on the lifting module 13, one of the lifting modules 13 is controlled to move laterally on the support frame 12, so that one of the material boxes 14 on the lifting module 13 is aligned with the beginning of the material conveying component 8 and also aligned with the kicking component 22, so that the material box 14 is placed between the material conveying component 8 and the kicking component 22. At this time, the material box 14 is placed at the designated feeding position. With the intermittent operation of the kicking component 22 and the intermittent upward or downward movement of the lifting module 13 with the material box 14, the lead frames in the material box 14 are kicked one by one onto the material conveying component 8, and then the material conveying component 8 transports the lead frames to facilitate the subsequent feeding process. After the lead frames in the material box 14 are kicked out, the corresponding lifting module 13 is controlled to move laterally again to align another material box 14 with the kicking component 22 and the conveying component 8. Furthermore, once all the lead frames in the material boxes 14 on one lifting module 13 have been kicked out, another lifting module 13 containing a material box 14 can be controlled to move laterally to a designated position. By controlling the lateral movement of at least two lifting modules 13 and their own vertical movement, several material boxes 14 containing lead frames can be sequentially placed at designated feeding positions, thus continuously feeding the lead frames.

[0039] The kicking assembly 22 is existing technology and can be composed of a laterally movable kicking rod and a drive module for controlling the reciprocating movement of the kicking rod. The drive module drives the kicking rod to reciprocate in the direction of approaching or moving away from the material box 14. In conjunction with the intermittent lifting and lowering of the material box 14, the lead frame is kicked to the conveying assembly 8 one by one. The drive module for controlling the reciprocating movement of the kicking rod is a conventional design and will not be described in detail here.

[0040] To achieve independent control of each lifting module 13, the support frame 12 is equipped with a number of control modules matching the number of lifting modules 13. Each control module controls a different lifting module 13 (i.e., one-to-one control). Each control module includes a fourth servo motor 15 and a fourth threaded rod 16 arranged laterally along its axis. The axis of the fourth threaded rod 16 is parallel to the direction of movement of the lifting module 13. One end of the fourth threaded rod 16 is connected to the output shaft of the fourth servo motor 15 via a coupling, and the fourth threaded rod 16 is threadedly connected to the corresponding lifting module 13. By operating the fourth servo motor 15, the fourth threaded rod 16 is driven to rotate, and through its threaded engagement with the lifting module 13, the lateral movement of the lifting module 13 on the support frame 12 is controlled.

[0041] Furthermore, when the material box 14 is placed at the designated position on the lifting module 13, the material box 14 is in an closed state. However, in order to achieve automatic opening of the material box 14, each lifting module 13 is equipped with several opening modules 17 for cooperating with the material box 14 to open the material box 14. When several material boxes 14 loaded with lead frames are placed at the designated position on the lifting module 13, each material box 14 corresponds to a different opening module 17. After running the opening module 17, the material box 14 is opened. The specific method of opening the material box 14 is described below.

[0042] like Figure 4 As shown, the conveyor roller assembly 7 includes a support base 71 mounted on the movable plate 6. A plurality of transversely arranged and horizontally aligned conveyor rollers 72 are rotatably mounted on the support base 71. These conveyor rollers 72 are arranged equidistantly, with their array direction perpendicular to the conveying direction of the conveyed component. The loading frame 2 has several through holes 203 formed on its side near the conveyor rollers 72 for the conveyor rollers 72 to pass through. When the first control unit 601 controls the movable plate 6 to move laterally towards the loading station 4, it carries the conveyor rollers 72 through the through holes 203, placing the conveyor rollers 72 at the loading station 4 and connecting them to the end of the conveying assembly 8.

[0043] To drive several conveyor rollers 72 to rotate synchronously, a drive shaft 73 with its axis arranged laterally and parallel to the array direction of the conveyor rollers 72 is rotatably mounted on the moving plate 6. A bevel gear assembly 74 for transmission is provided between the drive shaft 73 and the end of each conveyor roller 72 furthest from the loading station 4. The bevel gear assembly 74 consists of a pair of meshing bevel gears. A first drive component 75 for driving the drive shaft 73 to rotate is provided on the moving plate 6. A pair of bevel gears are respectively mounted on the drive shaft 73 and the end of each conveyor roller 72. By operating the first drive component 75 to drive the drive shaft 73 to rotate, the several conveyor rollers 72 are driven to rotate synchronously under the transmission action of the several pairs of bevel gears, thus supporting the individual lead frame while simultaneously conveying it to the loading station 4. The first drive component 75 is existing technology and can consist of a drive motor, drive wheels, and a drive belt, or the output shaft of the drive motor can be directly connected to the end of the drive shaft 73 for the same driving function; further details are omitted here.

[0044] like Figure 5 As shown, the lifting assembly 5 includes a fixed frame 51 located at the bottom of the support platform 1. The fixed frame 51 has a lifting frame 52 that can move up and down. The top of the lifting frame 52 is equipped with several material support blocks 55 for supporting the stacked lead frames after passing through the conveyor belt. The material support blocks 55 are arranged in an equidistant array along the width direction of the loading frame 2. When the stacked lead frames are conveyed to the front end of the loading frame 2, the lifting frame 52 is controlled to move upward, so that the tops of the material support blocks 55 pass through the conveyor belt from bottom to top, that is, between two adjacent conveyor belts 3, thereby lifting the stacked lead frames to the loading station 4. The bottom of the lifting frame 52 is equipped with a fifth servo motor 53 with its output shaft facing upward. A first threaded rod 54 is also rotatably provided with its bottom end fixed to the output shaft of the fifth servo motor 53. The first threaded rod 54 is threadedly connected to the fixed frame 51. After the fifth servo motor 53 is activated to drive the first threaded rod 54 to rotate, the lifting frame 52 is controlled to move up and down automatically under the threaded engagement between the first threaded rod 54 and the fixed frame 51.

[0045] like Figure 6 As shown, the material conveying assembly 8 includes a support plate 813. The top of the support plate 813 is provided with a fixed plate 81 and a movable plate 82 that can move towards or away from the fixed plate 81. Material conveying components are provided on the side of the fixed plate 81 and the movable plate 82 that are close to each other. The material conveying components on both sides are symmetrically arranged based on the material conveying trajectory of the lead frame. When the material box lifting assembly connected to the beginning of the material conveying assembly 8 is running, the lead frame can be fed one by one and intermittently, pushing the lead frame to the material conveying components on both sides. The material conveying components on both sides are controlled to run simultaneously, thereby transporting the lead frame to the conveying roller 72.

[0046] The two conveying components on both sides have the same structure. The conveying component mounted on the fixed plate 81 includes a first conveyor pulley 83 and a second conveyor pulley 84, rotatably mounted at both ends of the fixed plate 81 and at the same height. A conveyor belt 85 for conveying the lead frame is wound around the first and second conveyor pulleys 83 and 84. It also includes a tensioning wheel module 86 rotatably mounted on the fixed plate 81 to keep the conveyor belt 85 always taut. The lower half of the conveyor belt 85 is wound around the tensioning wheel module 86. After the material box lifting assembly pushes the lead frame to the upper half of the conveyor belts 85 on both sides, it drives the first or second conveyor pulley 83 to rotate, thus moving the conveyor belt 85 and conveying the lead frame.

[0047] To drive the second conveyor pulley 84 to rotate, a splined shaft 87, coaxially arranged with the second conveyor pulley 84, is rotatably mounted on the fixed plate 81. The second conveyor pulley 84 on the fixed plate 81 is fixedly mounted to the splined shaft 87, while the second conveyor pulley 84 on the movable plate 82 is slidably mounted to the splined shaft 87. When the splined shaft 87 is driven to rotate, the second conveyor pulley 84 on the fixed plate 81 and the second conveyor pulley 84 on the movable plate 82 can rotate synchronously. In addition, when the movable plate 82 is controlled to move towards or away from the fixed plate 81, the second conveyor pulley 84 on the movable plate 82 slides on the splined shaft 87. Regardless of the position of the second conveyor pulley 84 on the movable plate 82, the splined shaft 87 can drive it to rotate.

[0048] A second driving component 88 for driving the spline shaft 87 to rotate is installed on the support plate 813. The structure of the second driving component 88 is the same as that of the first driving component 75, and will not be described in detail here.

[0049] To control the movement of the movable plate 82, a plurality of second threaded rods 89 are rotatably arranged laterally on the fixed plate 81, each threadedly connected to the movable plate 82. The axial direction of the second threaded rods 89 is consistent with the direction of movement of the movable plate 82. A third driving component 810 is also provided to drive the plurality of second threaded rods 89 to rotate synchronously. After the third driving component 810 drives the plurality of second threaded rods 89 to rotate synchronously, the movable plate 82 can be controlled to move towards or away from the fixed plate 81. Furthermore, the third driving component 810 is prior art and also consists of a drive motor, transmission wheel, and transmission belt, etc., and will not be described in detail here.

[0050] The fixed plate 81 is equipped with a second limiting wheel assembly 812, and the movable plate 82 is equipped with a first limiting wheel assembly 811. The second limiting wheel assembly 812 and the first limiting wheel assembly 811 are positioned at the initial end of the corresponding conveyor belt 85 and are used to cooperate with the upper half of the conveyor belt 85 to limit and guide the lead frame during the conveying process. During the process of the material box lifting assembly pushing the lead frame to the upper half of the conveyor belts 85 on both sides, the second limiting wheel assembly 812 and the first limiting wheel assembly 811 limit and guide the two sides of the lead frame, preventing the lead frame on the upper half of the conveyor belts 85 from tilting up and keeping the lead frame flat during the conveying process.

[0051] like Figure 7 As shown, the first limiting wheel assembly 811 and the second limiting wheel assembly 812 have the same structure and the same operating mode, and are symmetrically arranged based on the lead frame conveying trajectory. The first limiting wheel assembly 811 includes a rotating shaft 8111 rotatably mounted on the movable plate 82 with its axis arranged laterally. The axis of the rotating shaft 8111 is perpendicular to the conveying direction of the conveyor belt 85. It also includes a swing arm 8112, the middle position of which is fixedly mounted to one end of the rotating shaft 8111. Under the action of the rotating shaft 8111, the swing arm 8112 can rotate on the movable plate 82 around the laterally arranged axis.

[0052] A rotating rod 8113, with its axis parallel to the axis of the rotating shaft 8111, is rotatably mounted on the end of the swing arm 8112 near the initial end of the conveyor belt 85. One end of the rotating rod 8113 is equipped with a limiting wheel 8114 positioned above the initial end of the conveyor belt 85. During the process of the material box lifting assembly pushing the lead frame to the upper half of the conveyor belts 85 on both sides, it will pass between the initial end of the conveyor belt 85 and the limiting wheel 8114. The distance between the two is basically the same as the thickness of a single lead frame. The limiting wheel 8114 can limit and guide the lead frame during the conveying process, so that the lead frame is conveyed smoothly.

[0053] To automatically adjust the distance between the limiting wheel 8114 and the initial end of the conveyor belt 85 to accommodate lead frames of different thicknesses, the first limiting wheel assembly 811 also includes an adjusting cylinder 8115 and a first fixing member 8116 disposed on the side of the movable plate 82. The end of the adjusting cylinder 8115 is hinged to the first fixing member 8116 via a hinge shaft, and the end of the telescopic rod of the adjusting cylinder 8115 is hinged to the end of the swing arm 8112 away from the limiting wheel 8114 via a movable hinge member 8117. By operating the adjusting cylinder 8115, the telescopic rod of the adjusting cylinder 8115 extends or retracts, thereby applying force to the end of the swing arm 8112 away from the limiting wheel 8114, causing the swing arm 8112 to rotate on the movable plate 82 around a transversely arranged axis, thus moving the limiting wheel 8114 towards or away from the initial end of the conveyor belt 85.

[0054] To control the limiting wheel 8114 to rotate synchronously with the first conveyor pulley 83, a first transmission gear 8118 is rotatably mounted on the movable plate 82 and coaxially mounted with the first conveyor pulley 83. The first transmission gear 8118 is fixedly connected to the first conveyor pulley 83 rotatably mounted on the movable plate 82, so that the first conveyor pulley 83 and the first transmission gear 8118 rotate synchronously. A rotating bushing 8119 is rotatably mounted on the outside of the rotating shaft 8111 and coaxially mounted therewith. A second transmission gear 81110 is mounted on the rotating bushing 8119. A transmission toothed belt 81111 is wound around the first transmission gear 8118 and the second transmission gear 81110. The rotating bushing 8119 and the rotating rod 8113 are connected by a transmission gear set 81112, which consists of two meshing gears. While the first conveyor pulley 83 rotates synchronously with the first transmission gear 8118, the rotating bushing 8119 is driven to rotate outside the rotating shaft 8111 by the transmission action of the first transmission gear 8118, the transmission belt 81111, and the second transmission gear 81110. Finally, the rotation is transmitted through the transmission gear set 81112, thereby driving the limit wheel 8114 to rotate. By controlling the limit wheel 8114 to rotate synchronously with the first conveyor pulley 83, friction is reduced when the limit wheel 8114 contacts the lead frame. Furthermore, controlling the rotation of the swing arm 8112 does not affect the synchronous transmission of the limit wheel 8114.

[0055] like Figure 8 As shown, the long-side adjustment assembly 9 includes a first slide rail 91 arranged laterally on the loading frame 2. The length direction of the first slide rail 91 is perpendicular to the conveying direction of the conveyor belt. A first slider 92 and a second slider 93 are slidably mounted on the first slide rail 91. The first slider 92 is equipped with a first push cylinder 94 whose extension direction is parallel to the length direction of the first slide rail 91. The end of the extension rod of the first push cylinder 94 is fixedly mounted to the second slider 93. It also includes a second control component 95 for controlling the lateral sliding of the first slider 92 on the first slide rail 91. By operating the second control component 95, the first slider 92 can be controlled to slide laterally on the first slide rail 91. At this time, the first push cylinder 94 is not operating, thus causing the second slider 93 to slide laterally towards or away from the loading station 4.

[0056] The second slider 93 is equipped with a fixing pin 98, and the fixing pin 98 is equipped with a first push rod 97 for pushing the lead frame to move along its own length direction. When a single lead frame or a stack of lead frames is placed at the loading station 4, the second control unit 95 is activated, and the first slider 92 and the second slider 93 drive the first push rod 97 to move laterally, pushing the lead frame to move along its own length direction, thereby adjusting the position of the length side of the lead frame. In addition, if adjusting a stack of lead frames, after the stack of lead frames is pushed to align with the execution end of the outer loading robot, the first push cylinder 94 is activated, and the telescopic rod reciprocates, so that the second slider 93 can be pushed to move laterally back and forth on the first slide rail 91 while the first slider 92 remains stationary, and the stack of lead frames is pushed to its own alignment by the first push rod 97.

[0057] In addition, the middle position of the first push rod 97 is rotatably set with the fixing pin 98. The end of the first push rod 97 near the loading station 4 is formed with a vertically arranged pushing part 99 for contacting the lead frame. The end of the first push rod 97 away from the pushing part 99 is formed with a sliding groove 910, and the groove length of the sliding groove 910 is arranged horizontally. The second slider 93 is also equipped with a control cylinder 911 placed above the sliding groove 910 with the telescopic rod facing downward. The end of the telescopic rod of the control cylinder 911 is provided with a sliding rod 912, and the sliding rod 912 is slidably disposed in the sliding groove 910. When the lead frame on the first conveyor pulley 83 needs to be conveyed to the conveyor roller 72, the control cylinder 911 is activated, its telescopic rod extends downward, and the slide rod 912 moves downward to apply a downward thrust to the first push rod 97. The slide rod 912 slides in the slide groove 910, and the first push rod 97 rotates to lift the pusher part 99, thereby making way for the lead frame. When a single lead frame is conveyed to the conveyor roller 72, the telescopic rod of the control cylinder 911 retracts upward to reset.

[0058] like Figure 9As shown, the width adjustment assembly 10 includes a second slide rail 101 arranged laterally on the feeding frame 2. The length direction of the second slide rail 101 is parallel to the conveying direction of the conveyor belt. A third slider 102 and a fourth slider 103 are slidably mounted on the second slide rail 101. The third slider 102 is equipped with a second push cylinder 104 whose extension direction is parallel to the length direction of the second slide rail 101. The end of the extension rod of the second push cylinder 104 is fixedly mounted to the fourth slider 103. It also includes a third control component 105 for controlling the lateral sliding of the third slider 102 on the second slide rail 101. The fourth slider 103 is equipped with a second pusher 106 for pushing the lead frame to move along its own width direction. When the third control component 105 is activated, the third slider 102 and the fourth slider 103 drive the second pusher 106 to move laterally, thereby pushing the lead frame to move along its own width direction, thus adjusting the position of the width side of the lead frame. If the adjustment is to the stack of lead frames, after the stack of lead frames is pushed to align with the execution end of the outer feeding robot, the second push cylinder 104 is run, and the telescopic rod reciprocates, so that the fourth slider 103 can be pushed to move laterally back and forth on the second slide rail 101 while the third slider 102 remains stationary, and the stack of lead frames is pushed to its own alignment by the second pusher 106.

[0059] The first control component 601, the second control component 95, and the third control component 105 have the same structure and operate in the same way. They are all existing structures composed of a motor and a lead screw. The motor drives the lead screw to rotate, and under the action of the threaded engagement, the corresponding components can be driven to move. This will not be described in detail here.

[0060] like Figure 10-11 As shown, the lifting module 13 includes a transverse plate 131 that is laterally movably disposed on the support frame 12. The transverse plate 131 is provided with a lifting frame 132 that can move up and down. The top of the lifting frame 132 is equipped with a lifting platform 133 for supporting the material box 14. When the material box 14 loaded with the lead frame is placed on the lifting platform 133, the lifting frame 132 is controlled to move up and down on the transverse plate 131, and the transverse plate 131 is controlled to move laterally on the support frame 12, so that the material box 14 can move up and down and laterally. In order to control the vertical movement of the lifting frame 132, a first servo motor 134 with its output shaft facing upward is installed at the bottom of the lifting frame 132. A third threaded rod 135 with its axis arranged vertically is installed on the output shaft of the first servo motor 134, and the third threaded rod 135 is threadedly connected to the transverse plate 131. By running the first servo motor 134, the vertically arranged third threaded rod 135 can be driven to rotate. With the threaded engagement between the third threaded rod 135 and the transverse plate 131, the lifting frame 132 can be controlled to move up and down on the transverse plate 131.

[0061] When the cassette 14 containing the lead frame is placed on the lifting platform 133, several limiting components are provided on the top of the lifting platform 133 to limit the length of the cassette 14 in order to position the cassette 14 at the designated location. Each limiting component can limit the length of one cassette 14. The limiting components include a fixed limiting plate 136 disposed on the lifting platform 133 and a movable limiting plate 137 laterally disposed on the lifting platform 133. The movable limiting plate 137 can move towards or away from the fixed limiting plate 136, and the direction of movement of the movable limiting plate 137 is parallel to the direction of movement of the transverse plate 131. After the cassette 14 containing the lead frame is placed between the fixed limiting plate 136 and the movable limiting plate 137, both can limit the length of the cassette 14, placing it at the designated location and preventing the cassette 14 from shifting position. In addition, by controlling the movable limit plate 137 to move closer to or further away from the fixed limit plate 136, the distance between the two can be controlled to accommodate material boxes 14 of different widths.

[0062] To prevent the material box 14 from shifting during the material ejection process, a third push cylinder 138 with a telescopic rod is installed on the movable limiting plate 137, pointing towards the fixed limiting plate 136. The end of the telescopic rod of the third push cylinder 138 is equipped with a push block 139 for passing through the movable limiting plate 137 and pressing the material box 14 tightly. When the material box 14 is placed between the fixed limiting plate 136 and the movable limiting plate 137, the third push cylinder 138 is activated, the telescopic rod extends, and the push block 139 passes through the movable limiting plate 137, thus squeezing and pressing the material box 14 tightly, further limiting its position.

[0063] To control the synchronous movement of the movable limit plates 137 on each limiting component, a connecting frame 1310 is laterally movable at the bottom of the lifting platform 133. The movement direction of the connecting frame 1310 is parallel to the movement direction of the transverse plate 131. The movable limit plates 137 of each limiting component are fixedly mounted on the connecting frame 1310. When the connecting frame 1310 is controlled to move laterally at the bottom of the lifting platform 133, it can move synchronously with the movable limit plates 137 on each limiting component towards or away from their corresponding fixed limit plates 136. A fourth threaded rod 1312 with an axis parallel to the movement direction of the connecting frame 1310 is rotatably provided at the bottom of the lifting platform 133, and the fourth threaded rod 1312 is threadedly connected to the connecting frame 1310. A second servo motor 1311 is also installed at the bottom of the lifting platform 133, and the output shaft of the second servo motor 1311 is connected to one end of the fourth threaded rod 1312 through a coupling. The second servo motor 1311 is operated to drive the fourth threaded rod 1312 to rotate. With the threaded engagement between the fourth threaded rod 1312 and the connecting frame 1310, the connecting frame 1310 can be controlled to move laterally at the bottom of the lifting platform 133.

[0064] To limit the width of the material box 14, a push rod 1313 and a second positioning rod 1314 are provided on the top of the lifting platform 133 to limit the two width sides of the material box 14 respectively. The second positioning rod 1314 is fixedly installed, and the push rod 1313 can move laterally towards or away from the second positioning rod 1314, with the direction of movement perpendicular to the direction of movement of the movable limiting plate 137. When the material box 14 is placed between the fixed limiting plate 136 and the movable limiting plate 137, limiting its length side, the material box 14 is also placed between the push rod 1313 and the second positioning rod 1314, limiting its width side. Furthermore, by controlling the lateral movement of the push rod 1313 towards or away from the second positioning rod 1314, the distance between the two can be controlled to accommodate material boxes 14 of different lengths. By limiting the length and width sides of the material box 14, the material box 14 is accurately placed in the designated position, facilitating accurate subsequent material feeding.

[0065] A third servo motor 1315 is installed at the bottom of the lifting platform 133, and a third threaded rod 1317 with its axis aligned with the direction of movement of the push rod 1313 is rotatably mounted on the top of the lifting platform 133. One end of the third threaded rod 1317 is connected to the output shaft of the third servo motor 1315 via a transmission component 1316. The transmission component 1316 is existing technology and can be composed of a transmission wheel and a transmission belt, etc., and will not be described in detail here. The transverse plate 131 is also equipped with a fixing block 1318, which is threadedly connected to the fourth threaded rod 16. After the fourth servo motor 15 drives the fourth threaded rod 16 to rotate, the threaded engagement between the fourth threaded rod 16 and the fixing block 1318 controls the transverse plate 131 to move laterally on the support frame 12.

[0066] like Figure 12As shown, the material box 14 includes a material container body 141 and several material discharge slots 142 formed on the inner side wall of the material container body 141. Both width sides of the material container body 141 are formed with openings to facilitate the loading and unloading of lead frames. The lead frames are inserted into the material container body 141 through the openings by an insertion loading method. The length side of the lead frames is placed in the material discharge slots 142, so that the material container body 141 contains several stacked lead frames. After the lead frame is installed into the material box 141, during the handling of the material box 141, in order to prevent the lead frame from falling out of the opening automatically, a baffle component is rotatably provided at both openings of the material box 141 to block the corresponding openings. The baffle component includes an upper rotating member 143 rotatably disposed at the top of the material box 141 and a lower rotating member 144 rotatably disposed at the bottom of the material box 141, and also includes a vertically arranged baffle rod 145 for blocking the opening. The upper and lower ends of the baffle rod 145 are fixedly disposed on the upper rotating member 143 and the lower rotating member 144 respectively, so that the baffle rod 145 is rotatably disposed on the material box 141 around the vertical axis. When it is necessary to kick out the lead frame inside the material box 141, the box opening module 17 controls the upper rotating part 143 or the lower rotating part 144 to rotate, so that the stop rod 145 rotates around the vertical axis. After rotating to deviate from the corresponding opening, it will not block the lead frame, and the subsequent kicking process can be carried out.

[0067] To prevent the upper rotating component 143 and the lower rotating component 144 from rotating automatically, second fixing components 146 are provided at the inner bottom and inner top of the material box body 141. A spring 147 is provided between the second fixing component 146 and the stop rod 145 to apply tension to the stop rod 145 to block the corresponding opening. One end of the spring 147 is fixed to the second fixing component 146, and the other end of the second fixing component 146 is fixed to the stop rod 145. During the handling of the material box body 141, the spring 147 applies tension to the stop rod 145, so that the stop rod 145 always blocks the corresponding opening when no external force is applied. When the box opening module 17 controls the upper rotating component 143 or the lower rotating component 144 to rotate, the spring 147 will be in a stretched state.

[0068] In this embodiment, the box-opening module 17 includes a rotary cylinder 171 mounted on the lifting platform 133 with its output shaft facing upward. The output shaft of the rotary cylinder 171 is equipped with a toggle member 172 for rotating the lower rotating member 144. The toggle member 172 is formed with a placement groove 173 to accommodate the lower rotating member 144. When the material box 141 is placed on the lifting platform 133, the lower rotating member 144 is placed in the placement groove 173. After operating the rotary cylinder 171 to drive the toggle member 172 to rotate, force is applied to the lower rotating member 144 to make it rotate, thereby opening the material box 14.

[0069] In summary, this utility model possesses the aforementioned excellent characteristics, enabling it to achieve unprecedented efficiency in use and thus become a highly practical product.

[0070] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A feeding device with switchable high-density integrated circuit lead frame conveying mode, comprising a support platform (1) and a feeding frame (2) disposed on the support platform (1), wherein the feeding frame (2) is provided with a belt conveyor for conveying a stack of lead frames along its length, the belt conveyor comprising a plurality of belt conveyors (3) spaced apart on the feeding frame (2), characterized in that: The front end of the loading frame (2) is a loading station (4) for loading the lead wire frame. The support platform (1) is equipped with a lifting component (5) located directly below the loading station (4) and used to intermittently lift the piled lead wire frames. The support platform (18) is equipped with a steel bar conveying mechanism (21) for clamping and conveying the lead wire frame, and also with a flipping clamping mechanism (20) for loading the lead wire frame placed at the loading station (4) to the steel bar conveying mechanism (21). The support platform (1) is equipped with a movable plate (6) that can move laterally towards or away from the loading station (4). The direction of movement of the movable plate (6) is consistent with the length direction of the loading frame (2). The movable plate (6) is equipped with a conveying roller assembly (7) for supporting and laterally conveying a single lead frame. The conveying direction of the conveying roller assembly (7) is perpendicular to the conveying direction of the belt conveyor (3). A material conveying assembly (8) for intermittently transporting the lead frame piece by piece is provided on the side of the loading frame (2). When the movable plate (6) drives the conveying roller assembly (7) to move to the loading station (4), the end of the conveying roller assembly (7) is connected to the end of the material conveying assembly (8) to transport the lead frame piece by piece to the loading station (4). The support platform (18) is equipped with a material box lifting assembly for feeding the lead frame piece by piece. The material box lifting assembly is connected to the beginning of the material conveying assembly (8).

2. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 1, characterized in that: The material conveying assembly (8) includes a support plate (813), a fixed plate (81) and a movable plate (82) that can move toward or away from the fixed plate (81) are provided on the top of the support plate (813). Material conveying components are provided on the side of the fixed plate (81) and the movable plate (82) that are close to each other. The material conveying components provided on the fixed plate (81) include a first conveyor pulley (83) and a second conveyor pulley (84) that are rotatably provided at both ends of the fixed plate (81) and at the same height. The first conveyor pulley (83) and the second conveyor pulley (84) are wound with a conveyor belt (85) for conveying the lead frame. A spline shaft (87) coaxially provided with the second conveyor pulley (84) is rotatably provided on the fixed plate (81). The second conveyor pulley (84) on the fixed plate (81) is fixedly provided with the spline shaft (87). The second conveyor pulley (84) on the movable plate (82) is slidably provided with the spline shaft (87).

3. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 2, characterized in that: The fixed plate (81) is equipped with a second limiting wheel assembly (812), and the movable plate (82) is equipped with a first limiting wheel assembly (811). The second limiting wheel assembly (812) and the first limiting wheel assembly (811) are placed at the beginning of the corresponding conveyor belt (85) and are used to cooperate with the upper half of the conveyor belt (85) to limit and guide the lead frame during the conveying process.

4. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 3, characterized in that: The first limiting wheel assembly (811) includes a rotating shaft (8111) rotatably mounted on a movable plate (82) and arranged laterally on its axis, the axis of the rotating shaft (8111) being perpendicular to the conveying direction of the conveyor belt (85); it also includes a swing arm (8112), the middle position of the swing arm (8112) being fixedly mounted to one end of the rotating shaft (8111); a rotating rod (8113) with its axis parallel to the axis of the rotating shaft (8111) is rotatably mounted on the end of the swing arm (8112) near the initial end of the conveyor belt (85), one end of which is equipped with a limiting wheel (8114) positioned above the initial end of the conveyor belt (85).

5. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 1, characterized in that: The material box lifting assembly includes a support frame (12) and a lifting module (13). There are at least two lifting modules (13), both of which are laterally movable on the support frame (12). The lifting module (13) is used to drive the material box (14) loaded with the lead frame to move up and down and laterally. The material box lifting assembly also includes a kicking component (22) for kicking the lead frames in the material box (14) one by one onto the material conveying component (8).

6. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 5, characterized in that: The material box (14) includes a material container body (141). Both sides of the material container body (141) are formed with openings to facilitate the placement and removal of the lead frame. Both sides of the material container body (141) are rotatably provided with material blocking components to block the corresponding openings. Each lifting module (13) is equipped with several box opening modules (17) for cooperating with the material blocking components. When the material container body (141) is placed on the material container body (141), the box opening module (17) can control one of the material blocking components to rotate to open its corresponding opening.

7. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 6, characterized in that: The lifting module (13) includes a transverse plate (131) that is movably arranged in the support frame (12). The transverse plate (131) is provided with a lifting frame (132) that can move up and down. The top of the lifting frame (132) is equipped with a lifting platform (133) for supporting the material box (14). The bottom of the lifting frame (132) is equipped with a first servo motor (134) with its output shaft facing upward. The output shaft of the first servo motor (134) is equipped with a third threaded rod (135) with its axis arranged vertically, and the third threaded rod (135) is threadedly connected to the transverse plate (131).

8. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 7, characterized in that: The top of the lifting platform (133) is provided with several limiting components for limiting the length of the material box (14); the limiting components include a fixed limiting plate (136) provided on the lifting platform (133) and a movable limiting plate (137) that is laterally movably provided on the lifting platform (133). The movable limiting plate (137) can move towards or away from the fixed limiting plate (136), and the direction of movement of the movable limiting plate (137) is parallel to the direction of movement of the transverse plate (131).

9. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 8, characterized in that: The top of the lifting platform (133) is provided with a push rod (1313) and a second positioning rod (1314) for limiting the two width sides of the material box (14) respectively. The second positioning rod (1314) is fixedly installed. The push rod (1313) can move laterally towards or away from the second positioning rod (1314), and the direction of movement is perpendicular to the direction of movement of the movable limiting plate (137).

10. The feeding device for switchable high-density integrated circuit lead frame conveying mode according to claim 7, characterized in that: The material blocking component includes an upper rotating part (143) rotatably disposed on the top of the material box body (141) and a lower rotating part (144) rotatably disposed on the bottom of the material box body (141). It also includes a vertically arranged material blocking rod (145) for blocking the opening. The upper and lower ends of the material blocking rod (145) are respectively fixedly disposed on the upper rotating part (143) and the lower rotating part (144). The box opening module (17) includes a rotary cylinder (171) mounted on the lifting platform (133) with the output shaft facing upward. The output shaft of the rotary cylinder (171) is equipped with a toggle part (172) for driving the lower rotating part (144) to rotate. The toggle part (172) is formed with a placement groove (173) for accommodating the lower rotating part (144). When the material box body (141) is placed on the lifting platform (133), the lower rotating part (144) is placed in the placement groove (173).

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