Chip mounter and its feeding mechanism

Abstract

The present application relates to a kind of patch machine and its feeding mechanism, feeding mechanism includes bearing frame, transmission wheel, conveying belt and driver, transmission wheel is rotatably arranged in bearing frame and relative bearing frame has first position and second position, conveying belt is overlapped on transmission wheel and is linked with transmission wheel, the width of circuit substrate for bearing when conveying belt is used in first position is less than the width of circuit substrate for bearing when conveying belt is used in second position, driver is connected to bearing frame, and the output end of driver is linked with conveying belt. Since the position of transmission wheel can be adjusted, and the width of circuit substrate for bearing when conveying belt is used in first position is less than the width of circuit substrate for bearing when conveying belt is used in second position, wider bearing surface can carry heavier circuit substrate, without replacing different patch machine, light circuit substrate and heavy circuit substrate can be realized patching processing, improve the versatility of patch machine.

Description

Technical Field

[0001] This invention relates to the field of chip mounting technology, and in particular to a chip mounting machine and its feeding mechanism. Background Technology

[0002] Automatic pick-and-place machines are devices used to place electronic components at high speed and with high precision. Pick-and-place machines typically use a feeding mechanism to transport circuit boards to the placement area. The circuit boards are positioned within the placement area to facilitate the placement process by the machine's head.

[0003] In related technologies, for circuit boards with circuits or electronic components on both sides, a pair of loading mechanisms are generally used for conveying. Each loading mechanism includes a conveyor belt, with the two sides of the circuit board correspondingly overlapping the two conveyor belts to prevent damage to the circuits or electronic components on the back of the circuit board. This type of loading mechanism has limited carrying capacity due to the limited contact area between the conveyor belt and the circuit board. It is suitable for conveying lightweight circuit boards but generally unsuitable for conveying heavy circuit boards, resulting in low versatility of the pick-and-place machine. Summary of the Invention

[0004] This invention provides a pick and place machine and its feeding mechanism to improve the versatility of the pick and place machine.

[0005] A feeding mechanism for a pick and place machine includes:

[0006] Support frame;

[0007] A transmission wheel is rotatably mounted on the support frame and has a first position and a second position relative to the support frame;

[0008] A conveyor belt, overlapping and linked to the drive wheel, wherein in a first position the width of the conveyor belt used to carry the circuit board is smaller than the width of the conveyor belt used to carry the circuit board in a second position; and

[0009] A driver is connected to the support frame and the output end of the driver is linked to the conveyor belt; the feeding mechanisms are arranged in pairs, and the conveyor belts of the two feeding mechanisms are spaced apart so that the circuit board is straddling the two conveyor belts so that the circuit board can be moved in the feeding direction by the conveyor belt.

[0010] In one embodiment, the support frame has a limiting portion extending along the feeding direction, the support frame has a first direction and a second direction, the feeding direction, the first direction and the second direction are perpendicular to each other; in the second direction, the conveyor belt for carrying the circuit board is accommodated between the limiting portion and the drive wheel; in the first direction, the width of the conveyor belt extending out of the limiting portion at the first position is smaller than the width of the conveyor belt extending out of the limiting portion at the second position.

[0011] In one embodiment, in the second direction, the distance between the surface of the limiting portion facing the conveyor belt and the conveyor belt is less than the thickness of the circuit board.

[0012] In one embodiment, the feeding mechanism includes an adjustment member optionally disposed on the support frame to switch the drive wheel between a first position and a second position.

[0013] In one embodiment, the feeding mechanism includes an adjusting member disposed on the support frame, the adjusting member having a supporting portion, the support frame having a guide step that abuts against the supporting portion, the adjusting member being driven to rotate relative to the drive wheel, so that the supporting portion moves along the guide step, thereby switching the drive wheel between a first position and a second position.

[0014] In one embodiment, the feeding mechanism includes a clamping assembly, which includes a drive member oscillatingly connected to the support frame, a connector linked to the output end of the drive member, multiple first links linked to the connector, multiple second links linked in a one-to-one correspondence with the multiple first links, a clamping plate linked to the second links, and a clamping block connected to the support frame; the first links are spaced apart in the feeding direction, and the second links are spaced apart in the feeding direction; the drive member is used to drive the first links to oscillate relative to the support frame through the connector, and the first links drive the second links to move, so as to drive the clamping plate to move in the second direction and clamp the circuit board between the clamping block and the clamping plate.

[0015] In one embodiment, the support frame is provided with a plurality of grooves extending along the feeding direction, and the plurality of grooves correspond one-to-one with a plurality of second connecting rods; the connector is rotatably connected to the output end of the drive member, one end of the first connecting rod is rotatably connected to the support frame, and the other end of the first connecting rod is rotatably connected to the connector, so that two adjacent first connecting rods, the connector, and the support frame form a parallelogram structure; one end of the second connecting rod is rotatably connected to the clamping plate, and the other end of the second connecting rod is slidably and rotatably disposed in the groove; the first connecting rod is rotatably connected to the second connecting rod, and the connection position of the first connecting rod and the second connecting rod is located between the two ends of the first connecting rod and between the two ends of the second connecting rod.

[0016] In one embodiment, the clamping blocks are provided in multiples and are spaced apart along the feeding direction; each clamping block includes an integrally formed connecting portion and a protrusion, the connecting portion having an oblong hole extending along the feeding direction, and the support frame having a plurality of mounting holes evenly spaced along the feeding direction, the mounting holes being used to cooperate with the oblong hole to adjust the position of the clamping block on the support frame; the protrusion protrudes from the limiting portion in the first direction to cooperate with the clamping plate to clamp the circuit board.

[0017] In one embodiment, the feeding mechanism includes a pin assembly, which includes a lifter fixed relative to the position of the support frame, a base linked to the output end of the lifter, and a pin magnetically engaged with the base. The lifter is used to drive the base to move along the second direction, thereby moving the pin along the second direction, so that when the circuit board is clamped between the clamping block and the clamping plate, the pin supports the circuit board suspended between the two clamping plates.

[0018] A pick and place machine includes a machine body and a feeding mechanism for the pick and place machine as described in any of the above claims, wherein the support frame is detachably connected to the machine body.

[0019] The loading mechanism of the above-mentioned pick-and-place machine includes a carrier frame, a drive wheel, a conveyor belt, and a driver. The drive wheel is rotatably mounted on the carrier frame and has a first position and a second position relative to the carrier frame. The conveyor belt overlaps with and is linked to the drive wheel. In the first position, the width of the conveyor belt used to carry the circuit board is smaller than the width of the conveyor belt used to carry the circuit board in the second position. The driver is connected to the carrier frame, and the output end of the driver is linked to the conveyor belt. The loading mechanisms are arranged in pairs on the body of the pick-and-place machine, and the conveyor belts of the two loading mechanisms are spaced apart so that the circuit board can be placed across the two conveyor belts, so that the circuit board can be moved in the loading direction by the conveyor belt. Because the position of the drive wheel can be adjusted, and the width of the conveyor belt used to carry the circuit board in the first position is smaller than that in the second position, the wider carrying surface can carry heavier circuit boards. In other words, the feeding mechanism can transport relatively light circuit boards when the drive wheel is in the first position, and relatively heavy circuit boards when the drive wheel is in the second position. Light and heavy circuit boards can be mounted without changing different pick-and-place machines, thus improving the versatility of the pick-and-place machine. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram showing the drive wheel of the loading mechanism of a pick-and-place machine in a first position, according to one embodiment.

[0022] Figure 2 for Figure 1 An enlarged schematic diagram of point A of the loading mechanism of the pick-and-place machine shown;

[0023] Figure 3 This is a schematic diagram showing the drive wheel of the loading mechanism of a pick-and-place machine in a second position, according to one embodiment.

[0024] Figure 4 for Figure 3 An enlarged schematic diagram of point B on the loading mechanism of the pick-and-place machine shown;

[0025] Figure 5 for Figure 1 A schematic diagram of the loading mechanism of the pick-and-place machine from another perspective;

[0026] Figure 6 for Figure 5 An enlarged schematic diagram of point C of the loading mechanism of the pick-and-place machine shown;

[0027] Figure 7 This is a schematic diagram of the ejector pin assembly of the feeding mechanism of a pick-and-place machine according to one embodiment.

[0028] Figure label:

[0029] The components include: a feeding mechanism 10, a support frame 100, a slide 100a, a mounting hole 100b, a limiting part 110, an adjusting shaft 120, a transmission wheel 200, a conveyor belt 300, a driver 400, an auxiliary wheel 500, an adjusting component 600, a clamping assembly 700, a driving component 710, a connecting component 720, a first connecting rod 730, a second connecting rod 740, a clamping plate 750, a clamping block 760, a waist-shaped hole 760a, a connecting part 761, a protrusion 763, an ejector pin assembly 800, a lifting device 810, a base 820, an ejector pin 830, a base 831, and a contact pin 833. Detailed Implementation

[0030] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] refer to Figure 1 This invention discloses a feeding mechanism 10, which is detachably mounted on the body of a pick-and-place machine (not shown). The pick-and-place machine can be used to mount surface mount components onto a circuit board. Surface mount components include, but are not limited to, LED chips. During the mounting process, the feeding mechanism 10 of the pick-and-place machine moves the circuit board to the mounting area. The head of the pick-and-place machine can move relative to the body. After obtaining the surface mount component, the surface mount component is mounted onto the circuit board in the mounting area.

[0034] The loading mechanism 10 of the pick-and-place machine includes a support frame 100, a drive wheel 200, a conveyor belt 300, and a driver 400. The drive wheel 200 is rotatably mounted on the support frame 100 and has a first position and a second position relative to the support frame 100. The conveyor belt 300 overlaps with and is linked to the drive wheel 200. Figure 2 , Figure 3 and Figure 4 In the first position ( Figure 2 When the width of the conveyor belt 300 used to carry the circuit board is less than that of the second position ( Figure 4 The conveyor belt 300 is used to carry the width of the circuit board. The driver 400 is connected to the carrier frame 100 and the output end of the driver 400 is linked with the conveyor belt 300. The feeding mechanism 10 is arranged in pairs on the body of the pick and place machine, and the conveyor belts 300 of the two feeding mechanisms 10 are spaced apart so that the circuit board can be placed between the two conveyor belts 300, so that the circuit board can be moved in the feeding direction by the conveyor belt 300.

[0035] In some embodiments, the conveyor belt 300 and the drive wheel 200 are driven by friction. Two or more drive wheels 200 can be spaced apart along the feeding direction. The conveyor belt 300 between two drive wheels 200 can extend horizontally to ensure smooth transport of the circuit board. The feeding mechanism 10 may also include multiple auxiliary wheels 500 disposed on the support frame 100. The circumferentially closed conveyor belt 300 contacts the drive wheel 200 and the auxiliary wheels 500, and is wound around the output end of the driver 400. After the conveyor belt 300 is tensioned by the drive wheel 200 and the auxiliary wheels 500, the friction between the conveyor belt 300 and the drive wheel 200 and the auxiliary wheels 500 is ensured. The driver 400 drives the conveyor belt 300 to run around the drive wheel 200 and the auxiliary wheels 500, preventing the conveyor belt 300 from slipping. In some embodiments, the driver 400 may be a stepper motor to improve control accuracy. One or more auxiliary wheels 500 can also be adjusted to the position of the support frame 100. For example, the support frame 100 is provided with a waist-shaped hole, and the support shaft of the auxiliary wheel 500 can be moved along the waist-shaped hole and then fixed. This allows the tension of the conveyor belt 300 to be maintained by adjusting the position of the auxiliary wheel 500 after the conveyor belt 300 has slackened, thus ensuring the smooth operation of the conveyor belt 300.

[0036] refer to Figure 2 and Figure 4The support frame 100 has a limiting portion 110 extending along the feeding direction, and has a first direction and a second direction, which are perpendicular to each other. The surface of the limiting portion 110 facing the circuit board can be a plane, and this plane is parallel to the feeding direction and parallel to the second direction, or in other words, this plane can be perpendicular to the first direction, thereby limiting the movement direction of the circuit board and preventing the circuit board from deviating relative to the feeding direction during transport. In the second direction, the conveyor belt 300 for carrying the circuit board is accommodated between the limiting portion 110 and the drive wheel 200. In the first direction, the width of the conveyor belt 300 extending out of the limiting portion 110 at the first position is smaller than the width of the conveyor belt 300 extending out of the limiting portion 110 at the second position.

[0037] In some embodiments, the carrier 100 is detachably connected to the body of the pick-and-place machine, for example, by means of threaded fasteners such as bolts. This allows the entire feeding mechanism 10 to be detachably connected to the body, enabling it to be disassembled or installed as a whole. This modular design of the feeding mechanism 10 improves the ease of assembly and disassembly. With this structural design, the components of the feeding mechanism 10 can achieve relatively high pre-assembly positioning accuracy. By ensuring the assembly positioning accuracy of the carrier 100 and the body, the assembly positioning accuracy of other components and the body can be guaranteed. This avoids the reduction in assembly efficiency and positioning accuracy caused by sequentially installing the components of the feeding mechanism 10 onto the body.

[0038] It is understood that the first position and the second position can be two extreme positions in which the drive wheel 200 moves relative to the support frame 100 along the first direction. For example, the feeding mechanism 10 has an adjustment shaft 120 extending along the first direction, and the drive wheel 200 is rotatably mounted on the adjustment shaft 120. The position of the adjustment shaft 120 on the support frame 100 can be adjusted. In the first position, the height of the drive wheel 200 protruding from the limiting portion 110 is less than the height of the drive wheel 200 protruding from the limiting portion 110 in the second position. This results in the width of the drive wheel 200 and the conveyor belt 300 extending from the limiting portion 110 in the first position being less than the width of the conveyor belt 300 extending from the limiting portion 110 in the second position. This achieves a change in the carrying width of the conveyor belt 300, and a wider carrying surface has a higher carrying capacity.

[0039] refer to Figure 3 and Figure 4 In some embodiments, the feeding mechanism 10 includes an adjustment member 600 optionally disposed on the support frame 100 to switch the drive wheel 200 between a first position and a second position. Exemplarily, the adjustment member 600 is block-shaped and can be mounted on the adjustment shaft 120. When the adjustment member 600 is not installed, the drive wheel 200 is in the first position; after the adjustment member 600 is installed, the drive wheel 200 is in the second position, thereby realizing the switching of the drive wheel 200 between the first and second positions.

[0040] The end of the adjusting shaft 120 away from the drive wheel 200 can be slidably fitted onto the support frame 100. On the side of the support frame 100 away from the drive wheel 200, a compressible elastic element, such as a spring, can be fitted onto the adjusting shaft 120 to give the adjusting shaft 120 a tendency to move towards the side where the elastic element is located. The adjusting shaft 120 can also have a step, which is located on the same side of the support frame 100 as the drive wheel 200. When the adjusting member 600 is not installed, the elastic element causes the step to abut against the support frame 100, keeping the drive wheel 200 in a first position. After the adjusting member 600 is installed on the adjusting shaft 120, the adjusting member 600 is engaged between the support frame 100 and the step, the elastic element is further compressed, and the adjusting shaft 120 moves in the first direction under the action of the adjusting member 600, keeping the drive wheel 200 in a second position. The width of the conveyor belt 300 protruding from the limiting part 110 is also increased, and the load-bearing capacity is correspondingly increased. It is understandable that the adjustment member 600 can be configured with a variety of thicknesses, so that the drive wheel 200 can also have multiple intermediate positions between the first position and the second position, allowing for more variations in the distance between the drive wheel 200 and the protruding limiting part 110 of the conveyor belt 300 to accommodate more types of circuit boards.

[0041] In other embodiments, the feeding mechanism 10 includes an adjusting member 600 disposed on the support frame 100. The adjusting member 600 has an axially protruding abutting portion, and the support frame 100 has a guide step that abuts against the abutting portion. The adjusting member 600 can be driven to rotate relative to the transmission wheel 200, so that the abutting portion moves along the guide step, thereby switching the transmission wheel 200 between a first position and a second position. In this embodiment, the adjusting member 600 is rotatably disposed on the adjusting shaft 120, and the guide step and the abutting portion form a cam structure. Rotating the adjusting member 600 causes the abutting portion to move along the guide step, thereby realizing the movement of the adjusting shaft 120 in a first direction, and thus realizing the switching of the transmission wheel 200 between the first position and the second position. The guide step may be provided with multiple slots to lock the abutting portion on the guide step, thereby maintaining the relative position of the abutting portion and the guide step, and thus maintaining the position of the transmission wheel 200 relative to the support frame 100.

[0042] Of course, in other embodiments, there are many other ways to switch the transmission wheel 200 between the first position and the second position. For example, a nut can be fitted onto the end of the adjusting shaft 120 away from the transmission wheel 200. The nut is screwed onto the adjusting shaft 120, and rotating the nut can adjust the position of the adjusting shaft 120 relative to the support frame 100, thereby realizing the switching of the transmission wheel 200 between the first position and the second position.

[0043] Of course, in some embodiments, the adjustment of the position of the drive wheel 200 can also be automated using gears and motors. For example, a gear can be installed at the end of the adjustment shaft 120 away from the drive wheel 200 and linked to the output end of the motor, with the adjustment shaft 120 threadedly connected to the support frame 100. When the motor drives the adjustment shaft 120 to rotate relative to the support frame 100 via the gear, displacement occurs in the first direction, thereby enabling the drive wheel 200 to switch between a first position and a second position. In this embodiment, the pick-and-place machine can automatically adjust the width of the drive wheel 200 and the extension limit portion 110 of the conveyor belt 300 according to the thickness parameters of the circuit board input by the user, which can achieve higher efficiency and control precision than manually adjusting the position of the drive wheel 200.

[0044] In related technologies, the pre-set overlap width between the edge of a lightweight circuit board (also called a small board, such as one weighing less than 5 kg) and the conveyor belt 300 is generally narrow, for example, with an upper limit of 1 mm. When conveying such small boards, the width of the conveyor belt 300 extending beyond the limiting part 110 in the first direction needs to be controlled within 1 mm. For heavy circuit boards (also called large boards, such as those weighing 5 kg to 10 kg), the pre-set overlap width between the edge of the conveyor belt 300 and the conveyor belt 300 is wider to ensure smooth transport of the large board by the conveyor belt 300 and prevent slippage due to insufficient contact area. If the width of the conveyor belt 300 in contact with the circuit board is not variable, when the conveyor belt 300 used for conveying small boards is directly used for conveying large boards, the large board is prone to slipping relative to the conveyor belt 300. When the conveyor belt 300 used for conveying large boards is used for conveying small boards, the contact width between the conveyor belt 300 and the small board exceeds the pre-set width, which can easily cause damage to the circuitry or electronic components on the back of the small board. In this embodiment, the conveyor belt 300 can be a relatively wide conveyor belt 300 that can be used to transport large boards. However, when it is necessary to transport small boards, the width of the conveyor belt 300 used to contact the circuit board is reduced, so that it can be used to transport small boards. This avoids the high cost problem caused by using one set of pick and place machines for large boards and another set of pick and place machines for small boards, and improves the versatility of the pick and place machine.

[0045] The loading mechanism 10 of the above-mentioned pick-and-place machine includes a carrier frame 100, a drive wheel 200, a conveyor belt 300, and a driver 400. The drive wheel 200 is rotatably mounted on the carrier frame 100 and has a first position and a second position relative to the carrier frame 100. The conveyor belt 300 overlaps with the drive wheel 200 and is linked with the drive wheel 200. In the first position, the width of the conveyor belt 300 used to carry the circuit board is smaller than the width of the conveyor belt 300 used to carry the circuit board in the second position. The driver 400 is connected to the carrier frame 100, and the output end of the driver 400 is linked with the conveyor belt 300. The loading mechanisms 10 are arranged in pairs, and the conveyor belts 300 of the two loading mechanisms 10 are spaced apart so that the circuit board can be placed across the two conveyor belts 300 so that the circuit board can be moved in the loading direction by the conveyor belts 300. Since the position of the drive wheel 200 can be adjusted, and the width of the conveyor belt 300 used to carry the circuit board in the first position is smaller than the width of the conveyor belt 300 used to carry the circuit board in the second position, the wider carrying surface can carry a heavier circuit board. That is, the feeding mechanism 10 can transport relatively light circuit boards when the drive wheel 200 is in the first position, and can transport relatively heavy circuit boards when the drive wheel 200 is in the second position. The mounting processing of light and heavy circuit boards can be realized without changing different pick and place machines, which improves the versatility of the pick and place machine.

[0046] refer to Figure 2 and Figure 4 In the second direction, the distance between the surface of the limiting part 110 facing the conveyor belt 300 and the conveyor belt 300 is less than the thickness of the circuit board. This distance can be set to be extremely small, for example, less than the minimum thickness of the circuit board to be mounted by the pick-and-place machine, so as to prevent the circuit board from entering the gap between the limiting part 110 and the conveyor belt 300 and damaging the circuit board during the process of conveying the circuit board.

[0047] refer to Figure 5 and Figure 6The feeding mechanism 10 may further include a clamping assembly 700. The clamping assembly 700 includes a drive member 710 oscillatingly connected to the support frame 100, a connector 720 linked to the output end of the drive member 710, multiple first connecting rods 730 linked to the connector 720, multiple second connecting rods 740 linked one-to-one with the multiple first connecting rods 730, a clamping plate 750 linked to the second connecting rods 740, and a clamping block 760 connected to the support frame 100. For example, the clamping assembly 700 of this application has three first connecting rods 730 and three second connecting rods 740. The three first connecting rods 730 are evenly spaced in the feeding direction, and the three second connecting rods 740 are evenly spaced in the feeding direction. Two of the second connecting rods 740 are positioned at opposite ends of the clamping plate 750 in the feeding direction, while another second connecting rod 740 is positioned in the middle region of the clamping plate 750 in the feeding direction, thereby achieving stable support for the clamping plate 750. In other embodiments, the number of the first connecting rod 730 and the second connecting rod 740 can be increased.

[0048] For example, the drive member 710 is a cylinder. In other embodiments, the drive member 710 can be a hydraulic cylinder. The drive member 710 is used to drive the first connecting rod 730 to swing relative to the support frame 100 via the connector 720. The first connecting rod 730 drives the second connecting rod 740 to move, thereby causing the clamping plate 750 to move in the second direction and clamp the circuit board between the clamping block 760 and the clamping plate 750. The clamping plate 750 can be a thin steel plate that is parallel to the feeding direction and parallel to the second direction, or perpendicular to the first direction. Its width for contacting the circuit board in the first direction is small, while it can have a longer contact length with the circuit board in the feeding direction. When the circuit board moves to the mounting area, the clamping plate 750 abuts against the edge of the back side of the circuit board, that is, near the edge of the circuit board for contacting the conveyor belt. By using two clamping plates 750 arranged opposite each other in the first direction by two feeding mechanisms 10, the circuit board can be lifted away from the conveyor belt 300 and the circuit board can be limited and fixed to ensure that the chip mounter head can smoothly process the circuit board.

[0049] Furthermore, in some embodiments, a buffer strip may be attached to the upper end of the clamping plate 750. For example, a silicone strip with a U-shaped cross-section may be wrapped around the upper edge of the clamping plate 750. The buffer strip extends along the feeding direction and can cover the entire upper edge of the clamping plate 750. Alternatively, the buffer strip may be spaced at intervals along the feeding direction on the upper end of the clamping plate 750 to provide a buffering effect when the clamping plate contacts the circuit board, thereby increasing the static friction with the circuit board and preventing scratches or pressure damage to the circuit board.

[0050] Specifically, refer to Figure 6The support frame 100 is provided with multiple grooves 100a extending along the feeding direction, and each groove 100a corresponds to one of the multiple second connecting rods 740. In an embodiment where three second connecting rods 740 are provided, the grooves 100a are also evenly spaced at three intervals along the feeding direction, and each corresponds to one of the three second connecting rods 740. The connector 720 is elongated and rotatably connected to the output end of the drive member 710 in the middle region. One end of any first connecting rod 730 is rotatably connected to the support frame 100, and the opposite end of the first connecting rod 730 is rotatably connected to the connector 720, so that two adjacent first connecting rods 730, the connector 720, and the support frame 100 form a parallelogram structure. One end of any second link 740 is rotatably connected to the clamping plate 750. The other end of the second link 740 is slidably and rotatably disposed in the corresponding slide groove 100a. The second link 740 is rotatably connected to the corresponding first link 730. The connection position of the first link 730 and the second link 740 is located between the two ends of the first link 730 and between the two ends of the second link 740, thus realizing the cross connection of the first link 730 and the second link 740.

[0051] During the conveyor belt 300's transport of the circuit board, the upper end of the clamping plate 750 maintains a suitable distance from the back of the circuit board to prevent interference with its transport. After the conveyor belt 300 moves the circuit board to the mounting area, sensors, such as photoelectric sensors, can detect that the circuit board has moved into position, and the pick-and-place machine's control module can then control the conveyor belt 300 to stop. After the conveyor belt 300 stops, the pick-and-place machine's control module can control the drive component 710 to start, for example, by extending the piston rod of a cylinder to lift the connector 720. During this process, the parallelogram structure formed by the two adjacent first connecting rods 730, the connector 720, and the support frame 100 ensures that the connector 720 remains parallel to the feeding direction. During the lifting process, the connector 720 may also move forward or backward in the feeding direction, depending on whether the first connecting rods 730 are tilted forward or backward relative to the feeding direction when the connector 720 is not being lifted. Figure 5 In the illustrated embodiment, assuming the positive direction of the feeding direction is to the left, since the first connecting rod 730 is tilted forward relative to the feeding direction when the connecting member 720 is not lifted, the connecting member 720 will also move in the opposite direction of the feeding direction during the lifting process. During this process, the entire cylinder will swing relative to the support frame 100 so that the piston rod adapts to the movement of the connecting member 720.

[0052] refer to Figure 6Taking a set of interconnected first link 730 and second link 740 as an example, since the rotational connection position of the first link 730 and the second link 740 is located between the two ends of the first link 730 and between the two ends of the second link 740, and one end of the second link 740 is slidably and rotatably disposed in the slide groove 100a, by designing the length of the first link 730 and the second link 740, as well as the connection position of the first link 730 and the second link 740, it is possible to achieve that when the first link 730 swings relative to the support frame 100, the movement of the connection position of the second link 740 and the clamping plate 750 along the second direction is kept in a straight line. Combined with the motion characteristics of the parallelogram structure, it is possible to achieve the linear lifting of the clamping plate 750 in the second direction. That is, when the circuit board is delivered to the position, the clamping plate 750 linearly lifts the circuit board along the second direction, clamping the circuit board between the clamping plate 750 and the clamping block 760, thereby achieving the limiting and fixing of the circuit board in the mounting area.

[0053] This structural design not only ensures the circuit board remains parallel to the loading direction during lifting through the parallelogram structure, preventing it from tilting relative to the loading direction and slipping relative to the clamping plate 750, but also achieves linear lifting of the circuit board in the second direction. This prevents it from shifting forward or backward in the loading direction during lifting, which would reduce positioning accuracy and thus ensure the positioning accuracy of the circuit board in the mounting area, guaranteeing the mounting accuracy of the pick-and-place machine head. Furthermore, this structural design also prevents the circuit board from shifting forward or backward in the loading direction and rubbing against the clamping block 760, thus preventing damage to the circuit board caused by collisions or friction between the circuit or electronic components and the clamping block 760, thereby improving yield. Moreover, each loading mechanism 10 can achieve smooth lifting of the circuit board using a single drive element 710, compared to using two or more drive elements 710 in one loading mechanism 10, reducing device cost and power consumption.

[0054] Continue to refer to Figure 1 and Figure 2Multiple clamping blocks 760 can be configured and arranged at intervals along the feeding direction. Each clamping block 760 includes an integrally formed connecting portion 761 and a protrusion 763. The connecting portion 761 has an oblong hole 760a extending along the feeding direction. The carrier frame 100 has multiple mounting holes 100b evenly spaced along the feeding direction. The mounting holes 100b are used to engage with the oblong hole 760a to adjust the position of the clamping block 760 on the carrier frame 100. The protrusion 763 protrudes from the limiting portion 110 in a first direction to engage with the clamping plate 750 to clamp the circuit board. This structure of the clamping blocks 760 allows for easy adjustment of the position of each clamping block 760 on the carrier frame 100, thereby adjusting the distribution of the protrusions 763 for clamping the circuit board in the feeding direction. This utilizes multiple small contact surfaces to ensure reliable positioning of the circuit board in the mounting area and flexibly avoids circuits or electronic components on the circuit board. Furthermore, in some embodiments, the surface of the protrusion 763 facing the clamping plate 750 may be covered with a buffer layer, such as a plastic layer or a silicone layer, to provide a buffering effect when the clamping plate 750 contacts the circuit board, preventing scratches or pressure damage to the circuit board.

[0055] Further, refer to Figure 7 The feeding mechanism 10 may further include a pin assembly 800, which includes a lifter 810 fixed relative to the support frame 100, a base 820 linked to the output end of the lifter 810, and pins 830 magnetically engaged with the base 820. The lifter 810 can be a pneumatic cylinder or a hydraulic cylinder. The lifter 810 drives the base 820 to move in a second direction, thereby moving the pins 830 in the second direction. When the circuit board is clamped between the clamping block 760 and the clamping plate 750, the pins 830 support the circuit board suspended between the two clamping plates 750. Multiple pins 830 can be provided, and each pin 830 can be conveniently adjusted in position on the base 820 through magnetic engagement with the base 820.

[0056] The ejector pin 830 may be equipped with a spring to achieve elastic contact between the upper end of the ejector pin 830 and the circuit board. For example, the ejector pin 830 may include a base 831, a spring (not shown) and a magnet (not shown) disposed in the base 831, and a contact pin 833 with one end disposed in the base 831. The contact pin 833 interacts with the spring to float and connect with the base 831, and the magnet is used to magnetically attract the base 831 to the base 831. During the process of conveying the circuit board by the conveyor belt 300 and lifting the circuit board by the clamping assembly 700, the ejector pin 830 can be located in the initial position and spaced apart from the circuit board in the second direction. After the circuit board is clamped between the clamping block 760 and the clamping plate 750, the lifter 810 can drive the base 820 to move in the second direction, drive the ejector pin 830 to move in the second direction, and support the circuit board suspended between the two clamping plates 750 through the ejector pin 830. This forms multiple support points for the circuit board suspended between the two clamping plates 750, preventing the circuit board from deforming during the mounting process and improving the yield.

[0057] Because the contact area at the upper end of the contact pin 833 can be processed to be small, and combined with the magnetic fixation of the base 831 and the base 820, the position of the pin 830 on the base 820 can be flexibly adjusted according to the back of the circuit board to prevent the contact pin 833 from damaging the circuit or electronic components on the back of the circuit board; combined with the floating connection between the contact pin 833 and the base 831, the contact between the contact pin 833 and the circuit board can be buffered to prevent rigid impact on the circuit board and damage to the circuit board.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A feeding mechanism for a chip mounter, characterized in that, include: Support frame; A transmission wheel is rotatably mounted on the support frame and has a first position and a second position relative to the support frame; A conveyor belt overlaps with and is linked to the drive wheel. In the first position, the width of the conveyor belt used to carry the circuit board is smaller than the width of the conveyor belt used to carry the circuit board in the second position. as well as A driver is connected to the carrier frame and the output end of the driver is linked to the conveyor belt; the feeding mechanism is used to be arranged in pairs on the body of the pick and place machine, and the conveyor belts of the two feeding mechanisms are spaced apart so that the circuit board is straddling the two conveyor belts so that the circuit board can be moved in the feeding direction by the conveyor belt.

2. The feeding mechanism of the placement machine according to claim 1, characterized in that, The support frame has a limiting portion extending along the feeding direction. The support frame has a first direction and a second direction, and the feeding direction, the first direction, and the second direction are perpendicular to each other. In the second direction, the conveyor belt for carrying the circuit board is accommodated between the limiting portion and the drive wheel. In the first direction, the width of the conveyor belt extending out of the limiting portion at the first position is smaller than the width of the conveyor belt extending out of the limiting portion at the second position.

3. The feeding mechanism of the placement machine according to claim 2, characterized in that, In the second direction, the distance between the surface of the limiting portion facing the conveyor belt and the conveyor belt is less than the thickness of the circuit board.

4. The feeding mechanism of the placement machine according to claim 2, characterized in that, The feeding mechanism includes an adjustment member that can be selectively disposed on the support frame to allow the drive wheel to switch between a first position and a second position.

5. The feeding mechanism of the placement machine according to claim 2, characterized in that, The feeding mechanism includes an adjusting member disposed on the support frame. The adjusting member has a supporting portion, and the support frame has a guide step that abuts against the supporting portion. The adjusting member can be driven to rotate relative to the transmission wheel, so that the supporting portion moves along the guide step, thereby switching the transmission wheel between a first position and a second position.

6. The feeding mechanism of the placement machine according to claim 2, characterized in that, The feeding mechanism includes a clamping assembly, which includes a driving member oscillatingly connected to the support frame, a connecting member linked to the output end of the driving member, multiple first connecting rods linked to the connecting member, multiple second connecting rods linked in a one-to-one correspondence with the multiple first connecting rods, a clamping plate linked to the second connecting rods, and a clamping block connected to the support frame. The first connecting rods are spaced apart in the feeding direction, and the second connecting rods are spaced apart in the feeding direction. The driving member is used to drive the first connecting rods to oscillate relative to the support frame through the connecting member, and the first connecting rods drive the second connecting rods to move, so as to drive the clamping plate to move in the second direction and clamp the circuit board between the clamping block and the clamping plate.

7. The feeding mechanism of the placement machine according to claim 6, characterized in that, The support frame is provided with multiple sliding grooves extending along the feeding direction, and each of the multiple sliding grooves corresponds one-to-one with multiple second connecting rods; the connector is rotatably connected to the output end of the drive component, one end of the first connecting rod is rotatably connected to the support frame, and the other end of the first connecting rod is rotatably connected to the connector, so that two adjacent first connecting rods, the connector, and the support frame form a parallelogram structure; one end of the second connecting rod is rotatably connected to the clamping plate, and the other end of the second connecting rod is slidably and rotatably disposed in the sliding groove; the first connecting rod is rotatably connected to the second connecting rod, and the connection position of the first connecting rod and the second connecting rod is located between the two ends of the first connecting rod and between the two ends of the second connecting rod.

8. The feeding mechanism of the placement machine according to claim 6, characterized in that, The clamping blocks are configured in multiple ways and are spaced apart along the feeding direction; each clamping block includes an integrally formed connecting part and a protrusion, the connecting part has an oblong hole extending along the feeding direction, the support frame has a plurality of mounting holes evenly spaced along the feeding direction, the mounting holes are used to cooperate with the oblong hole to adjust the position of the clamping block on the support frame; the protrusion protrudes from the limiting part in the first direction to cooperate with the clamping plate to clamp the circuit board.

9. The feeding mechanism of the placement machine according to claim 6, characterized in that, The feeding mechanism includes a ejector assembly, which includes a lifter fixed relative to the position of the support frame, a base linked to the output end of the lifter, and ejector pins magnetically engaged with the base. The lifter is used to drive the base to move along the second direction, thereby moving the ejector pins along the second direction, so that when the circuit board is clamped between the clamping block and the clamping plate, the ejector pins support the circuit board suspended between the two clamping plates.

10. A pick-and-place machine, characterized in that, Includes a machine body and a loading mechanism for a pick and place machine according to any one of claims 1-9, wherein the support frame is detachably connected to the machine body.

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