Pneumatic wire threading device and method

Abstract

Pneumatic wire threading device and method The present invention relates to a wire threading device for automatically inserting a bonding wire into a wire bonding device, wherein the wire threading device comprises: a wire guide block configured to form a guide channel for guiding a bonding wire during a threading process and a slot connected to the guide channel for releasing the bonding wire after a threading process, wherein the wire guide block is positioned between an air tensioner and a bonding tool of the wire bonding device during use to guide the bonding wire from the air tensioner to the bonding tool; and a pneumatic wire pulling mechanism comprising a plurality of air channels extending in directions intersecting the axial direction of the guide channel, wherein the pneumatic wire pulling mechanism is configured to apply a plurality of pulling forces to the bonding wire through the plurality of air channels so as to allow the bonding wire to be pulled and pass through the guide channel during the threading process.

Description

Technology Field

[0001] The present invention generally relates to wire threading of a wire joining device, and in particular to an automatic wire threading device equipped with a pneumatic wire pulling mechanism. Background Technology

[0002] Wire bonding is a key process in semiconductor packaging that establishes an electrical connection between an integrated circuit (IC) chip and a package via conductive bonding wires (typically made of gold, aluminum, or copper). In ultrasonic wire bonding, bonding wires fed from a spool are inserted into the capillary of an ultrasonic transducer, and ultrasonic energy and force are applied to the capillary tip to weld the bonding wires to the bonding pads.

[0003] The wire threading process must be performed whenever the bonding wire spool is replaced or whenever the bonding wire exits the capillary. During this process, the bonding wire must be reinserted from the spool through intermediate equipment into the capillary. The conventional wire threading process requires significant manual labor and skilled workers because the bonding wire must be handled delicately.

[0004] Although various automatic wire threading methods have been proposed in existing technologies, they often have limitations in terms of efficiency, reliability, and accuracy. For example, U.S. Patent US9397066B2 discloses a wire feeding system in which a wire clamp is placed between an air tensioner and a capillary of a wire splicing device to guide the splicing wire during the wire threading process. However, this threading process is limited because it relies solely on the wire clamp to facilitate insertion between the air tensioner and the capillary. Furthermore, the movement and positioning of the wire clamp are restricted due to the two wire clamps located between the air tensioner and the capillary, which degrades overall insertion performance. Some existing wire threading devices incorporate multiple wire guide members to guide the splicing wire between the air tensioner and the capillary. However, due to this design, the splicing wire may easily slip or deviate from the guide members during the threading process, which can reduce efficiency and reliability. Therefore, it would be beneficial to provide an improved wire threading device that can be used in wire splicing devices. The problem to be solved

[0005] Accordingly, the objective of the present invention is to provide an automatic wire threading device for inserting a bonding wire through a bonding tool of a wire bonding device, and such a device is strategically placed between the air tensioner and the bonding tool of the wire bonding device to improve the efficiency, reliability, and accuracy of the wire threading process. means of solving the problem

[0006] According to a first aspect of the present invention, a device for automatically inserting a wire into a wire joining device is provided. The device comprises: a wire guide block configured to form a guide channel for guiding a joining wire during a threading process and a slot connected to the guide channel for releasing the joining wire from the guide channel after the threading process, wherein the wire guide block is positioned between an air tensioner and a joining tool of the wire joining device during use to guide the joining wire from the air tensioner to the joining tool; and a pneumatic wire pulling mechanism comprising a plurality of air channels extending in directions intersecting the axial direction of the guide channel of the wire guide block, wherein the pneumatic wire pulling mechanism is configured to apply a plurality of pulling forces to the joining wire through the plurality of air channels so as to allow the joining wire to be pulled and pass through the guide channel during the threading process. In some embodiments, the plurality of air channels may be arranged to extend in directions perpendicular to the axial direction of the guide channel of the wire guide block.

[0007] Thanks to multiple air channels formed in the wire guide block, the pneumatic wire pulling mechanism can apply a balanced pulling force to the bonding wire during the wire threading process. This balanced pulling force ensures that the bonding wire is transported in a direction substantially parallel to the axial direction of the guide channel, effectively preventing the bonding wire from slipping out through the slot. As a result, the efficiency, reliability, and accuracy of the wire threading process can be significantly improved.

[0008] According to a second aspect of the present invention, an automatic wire threading device is provided. The wire threading device comprises: a first wire guide block configured to form a first guide channel for guiding a bonding wire during a threading process and to form a first slot connected to the first guide channel for releasing the bonding wire from the first guide channel after the threading process, wherein the first wire guide block is positioned between the air tensioner and the first wire clamp during use; and a second wire guide block configured to form a second guide channel for guiding the bonding wire during the threading process and to form a second slot connected to the second guide channel for releasing the bonding wire from the second guide channel after the threading process, wherein the second wire guide block is positioned between the first wire clamp and the second wire clamp during use. A third wire guide block configured to form a third guide channel for guiding the bonding wire during the threading process and to form a third slot connected to the third guide channel for releasing the bonding wire from the third guide channel after the threading process, wherein the third wire guide block is positioned between a second wire clamp of the wire bonding device and the bonding tool when in use; and a pneumatic wire pulling mechanism comprising first and second air channels extending in directions intersecting the axial direction of the first guide channel of the first wire guide block and / or third and fourth air channels extending in directions intersecting the axial direction of the second guide channel of the second wire guide block, wherein the pneumatic wire pulling mechanism is configured to apply a plurality of pulling forces to the bonding wire through the first and second air channels and / or the third and fourth air channels so as to allow the bonding wire to be pulled and pass through the first and / or second guide channels during the threading process.In some embodiments, the plurality of air channels may be arranged to extend in directions perpendicular to the axial direction of the guide channel of the wire guide block.

[0009] According to a third aspect of the present invention, a method for automatically inserting a wire into a wire joining device is provided. The method comprises the steps of: providing a wire threading device comprising a wire guide block forming a guide channel and a slot connected to the guide channel, and a plurality of air channels extending in directions intersecting the axial direction of the guide channel of the wire guide block; positioning the wire guide block at an operating position between an air tensioner and a joining tool of the wire joining device to guide a joining wire through the guide channel during a threading process; applying a plurality of pulling forces to the joining wire through the plurality of air channels by the pneumatic wire pulling mechanism to pull and pass the joining wire into the guide channel during the threading process; and moving the wire guide block away from the operating position and releasing the joining wire through the slot.

[0010] These features, aspects, and advantages will be better understood by referring to the description, the attached claims, and the attached drawings. Brief explanation of the drawing

[0011] FIG. 1 is a perspective view of a wire joining device including a wire threading device that automatically inserts a joining wire through a joining tool of a wire joining device according to a first embodiment of the present invention. FIG. 2a is a perspective view of the wire threading device illustrated in FIG. 1. FIG. 2b is a perspective view of a first part of the intermediate wire guide block of the wire threading device. FIG. 2c is a perspective view of the intermediate wire guide block. FIG. 2d is a cross-sectional view of the intermediate wire guide block according to an embodiment of the present invention. FIG. 2e is a cross-sectional view of a pneumatic wire pulling mechanism within the intermediate wire guide block. FIGS. 3a to 3f illustrate the main steps performed by the wire threading device shown in FIG. 1 while inserting a bonded wire through a wire bonding device according to one embodiment of the present invention. FIG. 4a is a perspective view of a wire joining device including a wire threading device that automatically inserts a joining wire through a joining tool of a wire joining device according to a second embodiment of the present invention. FIG. 4b and FIG. 4c illustrate a perspective view and a cross-sectional view of the wire threading system illustrated in FIG. 4a, respectively. FIG. 4d schematically illustrates a cross-sectional view of a first wire guide block of the wire threading device illustrated in FIG. 4a. FIGS. 5a to 5g illustrate the main steps performed by a wire threading device while inserting a bonded wire through a wire bonding device according to one embodiment of the present invention. Identical parts in the drawing are indicated by the same reference number. Specific details for implementing the invention

[0012] Before discussing embodiments of the present invention in more detail, an overview is provided first. To improve the accuracy, reliability, and efficiency of the wire threading process of a wire joining device, a movable pneumatic wire threading device is provided that is strategically positioned between the air tensioner of the wire joining device and the joining tool during the threading process, and automatically inserts a joining wire from the air tensioner through two wire clamps of the wire joining device and through the joining tool.

[0013] According to a specific embodiment of the present invention, a wire threading device comprises a wire guide block and a pneumatic wire pulling mechanism. The wire guide block is configured to form a guide channel for guiding a bonding wire during a threading process and a slot connected to the guide channel to separate the bonding wire from the guide channel after the threading process. The pneumatic wire pulling mechanism comprises a plurality of air channels extending in directions intersecting the axial direction of the guide channel of the wire guide block and is configured to apply a balanced pulling force to the bonding wire through the plurality of air channels, thereby allowing the bonding wire to be pulled and pass through the inside of the guide channel formed by the wire guide block during the threading process. The angle formed between the directions of the air channels and the axial direction of the guide channel may be in the range of 30 to 90 degrees. Preferably, the plurality of air channels are arranged to extend in directions perpendicular to the axial direction of the guide channel of the wire guide block.

[0014] Multiple air channels of the pneumatic wire pulling mechanism can be arranged in various configurations to apply a balanced pulling force to the bonding wire. To prevent damage to the bonding wire due to strong airflow, the pneumatic wire pulling mechanism is configured to regulate the flow rate of each air channel to a maximum of 5 L / min.

[0015] In some embodiments, the pneumatic wire pulling mechanism may include a pair of air channels arranged symmetrically with respect to the guide channel of the wire guide block. This symmetrical arrangement allows pulling force to be applied from different directions, thereby ensuring balanced tension on the joining wire. By generating substantially equal airflow through the two air channels, the mechanism pulls and passes the joining wire into the guide channel with enhanced stability and precision.

[0016] In some embodiments, a pair of air channels may be arranged to have the same dimensions and shape.

[0017] In some embodiments, each air channel may be arranged to have a first section extending along a first direction and a second section extending along a second direction substantially perpendicular to the first direction. In other words, each air channel is arranged in an L-shape. Both the first and second directions extend at a predetermined angle relative to the axial direction of the guide channel and are preferably oriented substantially perpendicular to the axial direction of the guide channel. This L-shaped design can help ensure a more controlled and consistent pneumatic pulling effect by regulating the airflow within the air channel. For example, the flow rate of each air channel can be adjusted by changing the dimensions of the first and / or second sections.

[0018] To further improve flow rate control within the air channels, the pneumatic wire pulling mechanism may further include at least one air flow regulator located in one or two air channels to control the flow rate. For example, each air flow regulator may include a stopper portion that is inserted into the corresponding air channel to adjust the size of the air passage.

[0019] To avoid applying unnecessary stress to the bonding wire, the pneumatic wire pulling mechanism is configured to regulate the flow rate within the air channel so that it does not exceed 5 L / min.

[0020] To prevent the bonding wire from deviating from the guide channel during the threading process, at least one wire guide block within the wire threading device may be designed to consist of two separate parts. At least one part is movable relative to another part between a first position in which the slot of the wire guide block is open and a second position in which the slot is closed, and the device further includes an operating mechanism connected to the wire guide block and configured to move at least one part relative to the other part.

[0021] In some embodiments, the actuation mechanism may include a rotating shaft connected to a wire guide block, through which one part of the wire guide block can move relative to another part. Alternatively, the actuation mechanism may include an elastic component connected to the wire guide block and an actuation air channel formed in the wire guide block. The elastic component is deformed by compressed air input through the actuation air channel to open or close a slot in the wire guide block. The elastic component may include a spring or a leaf spring.

[0022] To further prevent the joining wire from easily slipping out of the guide channel, the wire threading device may include a motion controller configured to position the wire guide block at an operating position between the air tensioner and the joining tool before insertion, wherein an offset angle is created between the opening direction of the slot and the opening directions of the first and second wire clamps of the wire joining device. By ensuring that the opening direction of the slot does not coincide with the opening direction of the wire clamps, this configuration effectively prevents the joining wire from slipping out of the guide channel during the wire threading process. In one example, the offset angle between the opening direction of the slot and the opening direction of the wire clamps is substantially 90 degrees. In other words, the opening direction of the slot is substantially perpendicular to the opening direction of the wire clamps.

[0023] To facilitate the threading process, the wire threading device may further include a vacuum suction device connected to a bonding tool and configured to apply tensile force to the bonding wire during the threading process.

[0024] In some embodiments, the wire guide blocks may be positioned at different operating positions between the air tensioner of the wire joining device and the joining tool. In some embodiments, the wire threading device may include a plurality of wire guide blocks positioned at different operating positions between the air tensioner and the joining tool during the threading process. The various operating positions may include a first operating position between the air tensioner and a first wire clamp, a second operating position between the first wire clamp and a second wire clamp, and a third operating position between the second wire clamp and the joining tool of the wire joining device. The plurality of wire guide blocks may each be formed separately and then combined with each other or formed as a single component. To further improve the performance of the wire threading device, a plurality of pneumatic wire pulling mechanisms may be integrated. Specifically, at least two wire guide blocks within the device are each equipped with a pneumatic wire pulling mechanism to ensure more efficient and stable wire threading.

[0025] Details of a wire threading device according to some embodiments of the present invention will be described together with the accompanying drawings.

[0026] FIG. 1 is a perspective view of a wire joining device including a wire threading device (100) that automatically inserts a joining wire through a joining tool (15) of a wire joining device (10) according to a first embodiment of the present invention.

[0027] Referring to FIG. 1, the wire joining device (10) includes an air tensioner (11), a first wire clamp (12), a second wire clamp (13), a transducer (14), and a joining tool (15) attached to the transducer (14). The joining tool (15) is in the form of a capillary tube. The wire threading device (100) is configured to receive a joining wire passing through the air tensioner (11) and to insert it into the joining tool (15) through the first and second wire clamps (12 and 13).

[0028] The wire threading device (100) is a core component of the wire threading system designed for the wire joining device (10). The wire threading system is configured to automatically insert the joining wire from the wire spool through the joining tool (15) via the air tensioner (11), the first wire clamp (12), and the second wire clamp (13) in sequence. The wire threading system may also include other components or devices (not shown in the drawing) that transport the joining wire to the air tensioner (11) for wire threading.

[0029] The wire threading device (100) includes an upper wire guide block (110), an intermediate wire guide block (120) connected to the upper wire guide block (110), and a lower wire guide block (130) connected to the intermediate wire guide block (120). As illustrated in FIG. 1, during the threading process, the wire threading device (100) is positioned between the air tensioner (11) and the joining tool (15) of the wire joining device (10). More specifically, the upper wire guide block (110) is positioned at a first operating position between the air tensioner (11) and the first wire clamp (12), the intermediate wire guide block (120) is positioned at a second operating position between the first wire clamp (12) and the second wire clamp (13), and the lower wire guide block (130) is positioned at a third operating position between the second wire block (130) and the joining tool (15).

[0030] The wire threading device (100) also additionally includes a motion controller that operates to move three guide blocks along direction D1 to position them between the air tensioner (11) and the joining tool (15). Direction D1 is parallel to the opening direction D2 of the first and second wire clamps (12, 13). The opening direction refers to the gripping direction of the first and second wire clamps (12, 13).

[0031] Additionally, FIG. 2a is a perspective view of a wire threading device (100). An upper wire guide block (110) is configured to form an upper guide channel (110a) that guides the bonding wire during the threading process and an upper slot (110b) connected to the upper guide channel (110a) to separate the bonding wire from the upper guide channel (110a) after the threading process. An intermediate wire guide block (120) is configured to form an intermediate guide channel (120a) that guides the bonding wire during the threading process and an intermediate slot (120b) connected to the intermediate guide channel (120a) to separate the bonding wire from the intermediate guide channel (120a) after the threading process. The lower wire guide block (130) is configured to form a lower guide channel (130a) for guiding the bonding wire during the threading process, and a lower slot (130b) connected to the lower guide channel (130a) to separate the bonding wire from the lower guide channel (130a) after the threading process.

[0032] During the wire threading process, the upper, middle, and lower guide channels (110a, 120a, and 130a) are aligned with the through holes or openings of the air tensioner (11), the first and second wire clamps (12, 13), and the adhesive tool (15) to form a complete guide passage between the air tensioner (11) and the adhesive tool (15).

[0033] Referring to FIG. 2a, the intermediate wire guide block (120) comprises a first portion (121) and a second portion (122). The second portion (122) is movable relative to the first portion (121) between a first position in which the intermediate slot (120b) is open and a second position in which the intermediate slot (120b) is closed. The opening or closing direction of the intermediate slot (120b) is perpendicular to the opening and closing direction D2 of the first wire clamp (12) and the second wire clamp (13). In this embodiment, the intermediate slot (120b) may be closed to prevent the bonded wire from protruding during the wire threading process. The upper and lower slots (110b, 130b) may remain open throughout the entire wire threading process. This configuration is merely exemplary and should not be interpreted as limiting the scope of the invention. In other embodiments, more than one slot may be closed.

[0034] FIGS. 2B and FIGS. 2C are perspective views of a first part (121) and an intermediate wire guide block (120) according to an embodiment of the present invention, respectively. Referring to FIG. 2B, the first part (121) has a first groove (121a) having a tapered upper portion (A1) and a tapered lower portion (A2). The tapered upper portion (A1) has a wide opening so that the joining wire can be smoothly guided into the intermediate guide channel (120a). The tapered lower portion (A2) has a narrow opening at its end to accurately guide the joining wire to the second wire clamp (13). Referring to FIG. 2C, the second part (122) has a second groove (122a) similar to the first groove (121a). The second part (122) is movable relative to the first part (121) between a first position in which the first groove (121a) and the second groove (122a) are aligned and in contact with each other to close the intermediate slot (120b), and a second position in which the first groove (121a) and the second groove (122a) are separated to form the intermediate slot (120b) so that the bonding wire can be separated after the threading process.

[0035] The wire threading device (100) also includes an operating mechanism connected to a second part (122), which allows the second part to move between a first position and a second position to open and close the intermediate slot (120b), respectively. FIG. 2d is a cross-sectional view of an intermediate wire guide block (120). As shown in FIG. 2a and FIG. 2d, the operating mechanism includes a rotating shaft (123a) and an actuator (123b). The actuator (123b) is configured to move the second part (122) between a first position and a second position. The second part (122) is mounted on the rotating shaft (123a) and can move between the first position and the second position while rotating around the rotating shaft (123a).

[0036] The wire threading device (100) also includes a pneumatic wire pulling mechanism. FIG. 2e illustrates a cross-sectional view of a pneumatic wire pulling mechanism within an intermediate wire guide block (120) according to one embodiment of the present invention. Referring to FIG. 2e, the pneumatic wire pulling mechanism includes first and second air channels (121b, 122b) formed in first and second parts (121, 122), respectively. These two air channels are arranged in a direction substantially perpendicular to the axial direction of the intermediate guide channel (120a) of the intermediate wire guide block (120). Each air channel has a first section extending along a first direction T1 and a second section extending along a second direction T2. ​​The second direction T2 is perpendicular to the first direction T1.

[0037] These air channels are connected to at least one air generator (not shown) through two connectors (124). The two connectors (124) are attached to the first and second parts (121, 122), respectively. During the wire threading process, a pneumatic wire pulling mechanism is configured to apply a balanced pulling force to the bonding wire through the two air channels, so that the bonding wire can be pulled and passed through the intermediate guide channel (120b) during the threading process. Specifically, this pneumatic wire pulling mechanism operates to pull and pass the wire through the intermediate guide channel (120b) by generating substantially equal airflow in the first and second air channels (121b, 122b) to apply a balanced pulling force to the bonding wire.

[0038] As illustrated in FIG. 2e, the pneumatic wire pulling mechanism also includes an air flow regulator (R) located in the first air channel (121b) to control the flow rate. The air flow regulator (R) includes a movable stopper portion that can be inserted into the first air channel (121b) to control the size of the air passage within it. The stopper portion may be configured to move relative to the first air channel (121b) in a direction perpendicular to direction T2, thereby controlling the size of the air passage in the second section of the first air channel (121b). In another embodiment, at least one air flow regulator may be located in the second air channel (122b) to control the flow rate within it.

[0039] FIGS. 3a to 3f illustrate the main steps performed by the wire threading device (100) during threading of the bonded wire (50) through the wire bonding device according to one embodiment of the present invention.

[0040] In FIG. 3a, the motion controller moves the wire threading device (100) from a standby position to an operating position along direction D1. Specifically, the wire threading device (100) is positioned in an operating position such that an upper wire guide block (110) is inserted into a first operating position between the air tensioner (11) and the first wire clamp (12), an intermediate wire guide block (120) is inserted into a second operating position between the first and second wire clamps (12, 13), and a lower guide block (130) is inserted into a third operating position between the second wire block (130) and the joining tool (15).

[0041] To prevent the bonding wire from coming off the wire threading device (100) or the first and second wire clamps (12, 13), the wire threading device (100) is positioned in an operating position such that there is an offset angle between the direction of movement between the first and second positions of the second part (122) and the gripping direction of the first and second wire clamps (12, 13) gripping the bonding wire (50). This offset angle may range from 10 degrees to 90 degrees. The direction of movement of the second part (122) indicates the opening and closing position of the intermediate slot (120b), and the gripping direction of the first and second wire clamps indicates the opening and closing direction of the wire clamps.

[0042] In FIG. 3b, the second part (122) of the intermediate wire guide block (120) closes the intermediate slot (120b) by rotating around the rotation shaft (123a) and moving relative to the first part (121). Specifically, the second part (122) is operated to move from a first position where the intermediate slot (120b) is open to a second position where the intermediate slot (120b) is closed. In this embodiment, the initial position of the second part (122) is the first position where the second part (122) is open.

[0043] In FIG. 3c, the joining wire (50) is inserted through the air tensioner (11).

[0044] In FIG. 3d, a pneumatic wire pulling mechanism connected to an intermediate wire guide block (120) operates to receive a bonding wire (50) from an air tensioner (11) and guide it into a guide channel formed by an upper wire guide block (110), an intermediate wire guide block (120), and a lower wire guide block (130). If the wire threading device (100) further includes an upper pneumatic wire pulling mechanism connected to an upper wire guide block (110), the upper pneumatic wire pulling mechanism also operates to pull the bonding wire into a guide channel formed by the wire threading device (100). The two pneumatic wire pulling mechanisms may operate simultaneously or sequentially.

[0045] In FIG. 3e, the first and second wire clamps (12, 13) operate to secure the joining wire (50) that has passed through the joining tool (15). The pneumatic wire pulling mechanism is turned off, and the second part (122) moves from the second position to the first position, thereby opening the middle slot (120b) of the middle wire guide block (120).

[0046] In FIG. 3f, the wire threading device (100) releases the bonded wire (50) through the upper slot (110b), the open middle slot (120b), and the lower slot (130b) and returns from the operating position to the standby position.

[0047] FIG. 4a is a perspective view of a wire joining device including a wire threading device (200) that automatically inserts a joining wire through a joining tool (15) of a wire joining device (10) according to a second embodiment of the present invention. FIG. 4b and FIG. 4c show a perspective view and a cross-sectional view of a wire threading system (200), respectively.

[0048] As illustrated in FIGS. 4a and 4b, the wire threading device (200) includes a first wire guide block (210), a second wire guide block (220), and a third wire guide block (230). These three blocks are arranged sequentially to guide the bonding wire from the air tensioner (11) through the first and second wire clamps (12, 13) to the bonding tool (15). Each wire guide block is configured to form a guide channel, and all guide channels are aligned to ensure the smooth passage of the bonding wire and to guide it accurately to the bonding tool (15). Specifically, the first wire guide block (210) forms a first guide channel (210a) that guides the bonding wire between the air tensioner (11) and the first clamp (12) during the threading process, and a second slot (210b) connected to the first guide channel (210a) to release the bonding wire after the threading process. The second wire guide block (220) forms a second guide channel (220a) that guides the bonding wire between the first clamp (12) and the second wire clamp (13) during the threading process, and a second slot (220b) connected to the second guide block (220a) to release the bonding wire after the threading process. The third wire guide channel (230) forms a third guide channel (230a) that guides the bonding wire between the second wire clamp (12) and the bonding tool (15) during the threading process, and a third slot (230b) connected to the third guide channel (230a) to release the bonding wire after the threading process. The first, second, and third guide channels are all aligned with the through openings or holes of the air tensioner (11) and the joining tool (15) to form complete guide channels for passing the joining wire from the air tensioner (11) through the joining tool (15) through the first and second wire clamps (12, 13).

[0049] Referring to FIG. 4a, the wire threading device (200) may further include a vacuum suction device (240) connected to the bonding tool (15) to make the insertion of the bonding wire easier.

[0050] In this embodiment, the first slot (210b) formed in the first wire guide block (210) and the second slot (220b) formed in the second wire guide block (220) are both closed to prevent the bonding wire from coming out of the first and second guide channels (210a, 220a) during the threading process.

[0051] Referring to FIGS. 4b and 4c, the first wire guide block (210) includes a first part (211) and a second part (212). Each part has an elongated groove (211a) along its length. As shown in FIG. 4c, which illustrates the shape of the elongated groove (211a), the elongated groove (211a) includes an upper tapered portion and a lower tapered portion. The upper tapered portion has a shape that gradually narrows from a wide opening, allowing the joining wire to be smoothly guided into the first guide channel (210a) of the first wire guide block (210). Meanwhile, the lower tapered portion has a narrow opening at its end to accurately guide the joining wire toward the first wire clamp (12). The second part (212) has an elongated groove of a similar shape along its length.

[0052] Likewise, the second wire guide block (220) includes a first part (221) and a second part (222). Each part has an elongated groove similar in shape to the elongated groove (211a), so it is not necessary to explain in detail.

[0053] Referring to FIG. 4b, the wire threading device (200) includes a first operating mechanism (213) connected to a first wire guide block (210) and a second operating mechanism (223) connected to a second wire guide block (220). The first operating mechanism (213) is configured to open and close a first slot (210b) by moving a second part (212) of the first wire guide block (210) relative to a first part (211). The second operating mechanism (223) is configured to open and close a second slot (220b) by moving a second part (222) of the second wire guide block (220) relative to a first part (221) of the second wire guide block (220).

[0054] Each operating mechanism may include a pneumatic or electronic actuator.

[0055] In some embodiments, each operating mechanism includes an elastic component connected to a wire guide block and an operating air channel formed inside the block. When compressed air is introduced through the operating air channel, the elastic component is deformed to open or close a slot formed in the wire guide block. The elastic component may be a spring or a pair of leaf springs. Specifically, when the slot is initially open, the compressed air deforms the elastic component to move one part of the wire guide block relative to another part, thereby closing the slot. Conversely, when the slot is initially closed, the compressed air deforms the elastic component to cause relative movement between the two parts of the wire guide block, thereby opening the slot.

[0056] FIG. 4d schematically illustrates a cross-sectional view of a first wire guide block (210) according to an embodiment of the present invention. Referring to FIG. 4d, the first operating mechanism (213) includes an operating air channel (215) formed in a first part (211) and connected to a second part (212) through a sealing ring (213a). When compressed air is introduced through the operating air channel (215), the second part (212) moves relatively between a first position in which the first and second parts of the first wire guide block (210) are aligned with the first part (211) and come into contact with each other to close the first slot (210b), and a second position in which the first and second parts (211, 212) are separated to open the first slot (210b). The configuration of the first operating mechanism (213) shown in FIG. 4d is presented for illustrative purposes only and should not be interpreted as limiting the scope of the present invention. The position, shape, and dimensions of the operating air channel (215) and the sealing ring (213a) may be adjusted as needed in other embodiments of the present invention.

[0057] The wire threading device also includes a first pneumatic wire pulling mechanism connected to a first wire guide block (210) and a second pneumatic wire pulling mechanism connected to a second wire guide block (220). Referring to FIG. 4d, the first pneumatic wire pulling mechanism includes two air channels (211b and 212b) arranged along directions substantially perpendicular to the axial direction of the first guide channel (210a) of the first wire guide block (210), configured to apply a balanced pulling force to the bonding wire through these two air channels (211b and 212b) so that the bonding wire can be pulled and pass through the inside of the first guide channel (210a) during the threading process. Similar to the air channels shown in FIG. 2e, the two air channels (211b and 212b) are each arranged in an L-shape.

[0058] During the wire threading process, the first pneumatic wire pulling mechanism generates substantially equal airflow in the first and second air channels (211b and 212b) to apply a balanced pulling force to the bonding wire, thereby effectively pulling the bonding wire into the first guide channel (210b) and passing it through.

[0059] As illustrated in FIG. 4d, the first pneumatic wire pulling mechanism further includes an air flow regulator (R) located in the first air channel (211b) to control the flow rate inside it. The air flow regulator (R) includes a movable stopper portion that is inserted into the first air channel (211b) to control the size of the air passage inside it. The stopper portion may be configured to move relative to the first air channel (211b) in a direction perpendicular to the direction of air flow, thereby controlling the size of the air passage of the first air channel (211b). In another embodiment, at least one air flow regulator may be located in the second air channel (212b) to control the flow rate inside it.

[0060] Likewise, the second pneumatic wire pulling mechanism comprises two air channels arranged substantially perpendicular to the axial direction of the second guide channel (220a) of the second wire guide block (220), and is configured to apply a balanced pulling force to the joining wire through these two air channels so that the joining wire can be pulled and pass through the second guide channel (220a) during the threading process. Since the second pneumatic wire pulling mechanism is similar to the first mechanism in terms of function, components, and structure, a detailed description thereof is omitted.

[0061] FIGS. 5a to 5g illustrate the main steps performed by the wire threading device (200) while inserting the joining wire (50) through the wire joining device (10) according to one embodiment of the present invention.

[0062] In FIG. 5a, the motion controller moves the wire threading device (200) from a standby position to an operating position. Specifically, the wire threading device (200) is positioned in an operating position such that a first wire guide block (210) is inserted into a first operating position between the air tensioner (11) and the first wire clamp (12), a second guide block (220) is inserted into a second operating position between the first and second wire clamps (12, 13), and a third guide block (230) is inserted into a third operating position between the second wire block (130) and the adhesive tool (15). A vacuum suction device (240) is coupled to the adhesive tool (15). When the wire threading device (200) is positioned in the operating position, the guide channel formed in the wire threading device (200) is aligned with the through holes of the air tensioner (11) and the adhesive tool (15).

[0063] To further prevent the bonding wire from coming off the wire threading device (200), the wire threading device (200) is positioned in an operating position such that there is an offset angle between the opening and closing direction of the first slot (210b) and the gripping direction of the first and second wire clamps (12, 13) that grip the bonding wire (50). This offset angle may be in the range of 10 to 90 degrees. The gripping direction refers to the opening and closing direction of the two wire clamps (12, 13).

[0064] In FIG. 5b, the first slot (210b) and the second slot (220b) are closed by the first and second operating mechanisms, respectively. Specifically, the first operating mechanism moves one part of the first wire guide block (210) relative to another part from a first position (initial position) where the first slot (210b) is open to a second position where the first slot (210b) is closed by injecting compressed air into an operating air channel formed in the first wire guide block (210). Likewise, the second operating mechanism moves one part of the second wire guide block (220) relative to another part from a first position (initial position) where the second slot (220b) is open to a second position where the second slot (220b) is closed by injecting compressed air into an operating air channel formed in the second wire guide block (220).

[0065] In Fig. 5c, the joining wire (50) is inserted through the air tensioner (11).

[0066] In FIG. 5d, the first and second pneumatic wire pulling mechanisms of the wire threading device (200) operate to receive the joining wire (50) from the air tensioner (11) and guide it to pass sequentially into the first, second, and third guide channels formed in the first, second, and third wire guide blocks (210, 220, 230).

[0067] In FIG. 5e, the vacuum suction device (240) operates to pull the bonding wire (50) toward the bonding tool (15).

[0068] In FIG. 5f, the first and second wire clamps (12, 13) operate to secure the joining wire (50) after it passes through the joining tool (15). After the joining wire (50) is secured by the first and second wire clamps (12, 13), all pneumatic wire pulling mechanisms, operating mechanisms, and vacuum suction devices (240) are turned off. When the first and second operating mechanisms are turned off and the inflow of compressed air is stopped, the first slot (210b) and the second slot (220b) are opened. Specifically, after the first operating mechanism is turned off, the movable part of the first wire guide block (210) returns to the first position (initial position) so that the first slot (210b) is opened, and after the second operating mechanism is turned off, the second wire guide block (210) returns to the first position (initial position) so that the second slot (220b) is opened.

[0069] In FIG. 5g, the wire threading device (200) releases the bonded wire through the first slot (210b), the second slot (220b) and the third slot (230b) and returns from the operating position to the standby position.

[0070] As described above, an embodiment of the present invention provides a wire threading device that automatically inserts a bonding wire from an air tensioner through a bonding tool of a wire bonding device. The proposed wire threading device comprises a plurality of wire guide blocks, each wire guide block configured to form a guide channel for guiding the bonding wire during the threading process and a slot connected to the guide channel for releasing the bonding wire after the threading process is completed. To effectively draw the bonding wire into the guide channel and prevent the bonding wire from escaping from the guide channel during the threading process, the wire threading device is configured to include at least one pneumatic wire pulling mechanism. Each pneumatic wire pulling mechanism is connected to a wire guide block and is configured to apply a balanced pulling force to the bonding wire through a plurality of air channels arranged along directions substantially perpendicular to the axial direction of the guide channel within the wire guide block. To further improve the reliability and efficiency of the threading process, at least one wire guide block is configured to include two separate parts, and at least one part is movable relative to the other part so as to close the slot during the threading process and open the slot to release the bonded wire after insertion.

[0071] Although the present invention has been described in considerable detail with reference to specific embodiments, other embodiments are possible. Accordingly, the spirit and scope of the appended claims should not be limited to the description of the embodiments included in this specification.

Claims

Claim 1 A device for automatically inserting a wire into a wire joining device, wherein the device comprises: a wire guide block configured to form a guide channel for guiding a joining wire during a threading process and a slot connected to the guide channel for releasing the joining wire from the guide channel after the threading process, wherein the wire guide block is positioned between an air tensioner and a joining tool of the wire joining device during use to guide the joining wire from the air tensioner to the joining tool; and a pneumatic wire pulling mechanism comprising a plurality of air channels extending in directions intersecting the axial direction of the guide channel of the wire guide block, wherein the pneumatic wire pulling mechanism is configured to apply a plurality of pulling forces to the joining wire through the plurality of air channels so as to allow the joining wire to be pulled and pass through the guide channel during the threading process. Claim 2 An insertion device according to claim 1, wherein the pneumatic wire pulling mechanism comprises a pair of air channels symmetrically arranged with respect to a guide channel of the wire guide block, and the pneumatic wire pulling mechanism is configured to generate an air flow having substantially the same flow rate within the pair of air channels to pull the joining wire into the guide channel and pass it through. Claim 3 An insertion device according to paragraph 2, wherein each of the pair of air channels has a first section extending along a first direction and a second section extending along a second direction perpendicular to the first direction. Claim 4 An insertion device according to paragraph 2, wherein the pneumatic wire pulling mechanism further comprises at least one air flow regulator located in one or both of the pair of air channels to control the flow rate therein. Claim 5 In paragraph 4, each air flow regulator is an insertion device comprising a stopper portion that is inserted into a corresponding air channel and can adjust the size of the air passage inside. Claim 6 An insertion device according to claim 1, wherein the pneumatic wire pulling mechanism is configured such that the flow rate of each of the plurality of air channels does not exceed 5 L / min. Claim 7 An insertion device according to claim 1, wherein the wire guide block comprises two separate parts, at least one part is movable relative to another part between a first position in which the slot is open and a second position in which the slot is closed, and the device further comprises an operating mechanism connected to the wire guide block and configured to move the at least one part relative to the other part. Claim 8 In claim 7, the insertion device, wherein the operating mechanism is connected to the wire guide block and includes a rotating shaft that allows one part of the wire guide block to move relative to another part. Claim 9 In claim 7, the operating mechanism comprises an elastic component coupled to the wire guide block and an operating air channel formed in the wire guide block, wherein the elastic component is deformed by compressed air input through the operating air channel to open and close a slot of the wire guide block, an insertion device. Claim 10 An insertion device according to claim 1, further comprising a motion controller configured to position the wire guide block at an operating position between the air tensioner and the joining tool before threading such that an offset angle exists between the opening direction of the slot of the wire joining device and the opening direction of the first and second wire clamps. Claim 11 An insertion device according to claim 10, wherein the motion controller is further configured to position the wire guide block at the operating position such that the opening direction of the slot is substantially perpendicular to the opening direction of the first and second wire clamps. Claim 12 An insertion device according to claim 1, further comprising a vacuum suction device connected to the joining tool and configured to apply tensile force to the joining wire to facilitate threading of the wire through the joining tool. Claim 13 In claim 1, the wire guide block is an insertion device positioned between the air tensioner of the wire joining device and the first wire clamp, between the first wire clamp and the second wire clamp, or between the second wire clamp and the joining tool during the threading process. Claim 14 A wire threading device for automatically inserting a wire into a wire joining device, wherein the wire threading device comprises: a first wire guide block configured to form a first guide channel for guiding a joining wire during a threading process and to form a first slot connected to the first guide channel for releasing the joining wire from the first guide channel after the threading process, wherein the first wire guide block is positioned between the air tensioner and the first wire clamp when in use; a second wire guide block configured to form a second guide channel for guiding the joining wire during a threading process and to form a second slot connected to the second guide channel for releasing the joining wire from the second guide channel after the threading process, wherein the second wire guide block is positioned between the first wire clamp and the second wire clamp when in use; and a third wire configured to form a third guide channel for guiding the joining wire during a threading process and to form a third slot connected to the third guide channel for releasing the joining wire from the third guide channel after the threading process. The third wire guide block, which serves as a guide block and is positioned between the second wire clamp of the wire joining device and the joining tool when in use;A wire threading device comprising a pneumatic wire pulling mechanism including first and second air channels extending in directions intersecting the axial direction of a first guide channel of a first wire guide block and / or third and fourth air channels extending in directions intersecting the axial direction of a second guide channel of a second wire guide block, wherein the pneumatic wire pulling mechanism is configured to apply a plurality of pulling forces to the joining wire through the first and second air channels and / or the third and fourth air channels, so as to allow the joining wire to be pulled and pass through the first and / or second guide channels during the threading process. Claim 15 A wire threading device according to claim 14, wherein the pneumatic wire pulling mechanism is configured to generate airflow having substantially the same flow rate in the first and second air channels to pull the joining wire through the first guide channel, and / or generate airflow having substantially the same flow rate in the third and fourth air channels to pull the joining wire through the second guide channel. Claim 16 A wire threading device according to claim 14, wherein the first wire guide block is composed of two parts, at least one part is movable relative to another part between a first position in which the first slot is open and a second position in which the first slot is closed, and the device further comprises a first operating mechanism connected to the first wire guide block and configured to move at least one part relative to another part. Claim 17 A wire threading device according to claim 14, wherein the second wire guide block is composed of two parts, at least one part is movable relative to another part between a first position in which the second slot is open and a second position in which the second slot is closed, and the device further comprises a second operating mechanism connected to the second wire guide block and configured to move at least one part relative to another part. Claim 18 A wire threading device according to claim 14, further comprising a motion controller configured to position the first to third wire guide blocks at their respective operating positions before inserting the joining wire, such that an offset angle exists between the opening or closing direction of the first to third slots and the opening or closing direction of the first and second wire clamps of the wire joining device. Claim 19 A wire threading device according to claim 18, wherein the motion controller is further configured to position the first, second, and third wire guide blocks at their respective operating positions such that the opening and closing directions of the first, second, and third slots are substantially perpendicular to the opening and closing directions of the first and second wire clamps. Claim 20 A method for automatically inserting a wire in a wire joining device, the method comprising: providing a wire threading device comprising a wire guide block forming a guide channel and a slot connected to the guide channel, and a plurality of air channels extending in directions intersecting the axial direction of the guide channel of the wire guide block; positioning the wire guide block at an operating position between an air tensioner and a joining tool of the wire joining device to guide a joining wire from the air tensioner to the joining tool through the guide channel during a threading process; applying a plurality of pulling forces to the joining wire through the plurality of air channels by the pneumatic wire pulling mechanism to pull and pass the joining wire into the guide channel during a threading process; and moving the wire guide block away from the operating position and releasing the joining wire through the slot; the insertion method.

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