A convenient and adjustable pusher mechanism that can adapt to lead frames of different widths

Abstract

The present invention relates to the field of lead frame pushing, and in particular to a conveniently adjustable pushing mechanism that can adapt to lead frames of different widths. It includes a pushing drive assembly, on which a width-adjustable push rod assembly is provided, and the pushing drive assembly cooperates with the width-adjustable push rod assembly to make the force point be in the middle position of the width of the lead frame when pushing, and there is no need to replace parts to adapt to lead frames of different widths; the present invention solves the problem of pushing stability and position accuracy of the lead frame by driving a pushing manipulator with a stepping motor; a ratchet and a ratchet-toothed adjusting rod are designed to cooperate, and the contact position between the pushing rod and the frame can be quickly and conveniently adjusted, so that the force point is in the middle position of the width of the lead frame.

Description

Technical Field

[0001] The invention belongs to the technical field of lead frame pushing, and in particular relates to a conveniently adjustable pushing mechanism that can adapt to lead frames of different widths. Background Art

[0002] After the lead frame has completed all the processes in the wafer track of the semiconductor die bonding equipment or clamp welding equipment, it needs to be stored in the clip box or enter the next equipment to continue the subsequent process. Since the track film clamp usually only clamps the edge of the lead frame in the width direction to transport the lead frame, when the width of the lead frame is large, the clamp is easy to cause the lead frame to be skewed and damaged when pushing the lead frame into the clip box or the next machine.

[0003] There are solutions on the market that use a cylinder structure to push the lead frame at the end of the track feeding mechanism into the magazine or the next machine.

[0004] The push mechanism of the cylinder structure has defects:

[0005] The speed and position of the cylinder movement are difficult to achieve smooth and accurate requirements. The lead frame is at risk of overshoot damage when entering the magazine or getting off the machine, and overshoot will make it difficult to control the position of entering the magazine or getting off the machine. The pushing mechanism on the market currently faces lead frames of different widths. In order to make the force point in the middle of the lead frame width when pushing the material, parts need to be replaced to adapt to lead frames of different widths, and the width compatibility is not good. Summary of the invention

[0006] In view of the above problems, the present invention provides a convenient and adjustable pusher mechanism that can adapt to lead frames of different widths. It includes a pusher drive assembly, on which a width-adjustable push rod assembly is provided;

[0007] The push drive assembly cooperates with the width-adjustable push rod assembly to place the force point in the middle of the lead frame width when pushing the material, and there is no need to replace parts to adapt to lead frames of different widths;

[0008] Drive the pusher robot to solve the problem of push stability and lead frame position accuracy; design a ratchet and a ratchet adjustment rod to work together to quickly and conveniently adjust the contact position between the pusher and the frame so that the force point is located in the middle of the lead frame width.

[0009] Furthermore, the push drive assembly includes a slide rail mounting plate, a motor mounting plate is installed on the bottom of the slide rail mounting plate, and a stepper motor is installed on the bottom of the motor mounting plate; a slide rail is installed on one side wall of the slide rail mounting plate, and a belt pressure plate is slidably connected to the slide rail.

[0010] Furthermore, a slider mounting plate is installed on one side wall of the belt pressure plate, and the bottom of the slider mounting plate is slidably connected to the top of the slide rail mounting plate.

[0011] Furthermore, a synchronous belt is installed on the belt pressure plate, two sets of synchronous wheels are meshed and connected on the inner wall of the synchronous belt, and a lifting rod limit block is installed on the top of the slide rail mounting plate.

[0012] Furthermore, a bearing mounting plate is installed on the bottom of the lifting rod limit block, a flange bearing is rotatably connected to the bearing mounting plate, a rotating shaft is installed in the flange bearing, and the top of the rotating shaft is transmission-connected to the bottom of one group of the synchronous wheels.

[0013] Furthermore, a sensing sheet is installed on one side wall of the slide rail mounting plate, a grooved electrical sensor is installed on one side wall of the slide rail mounting plate close to the sensing sheet, and the output end of the stepper motor is transmission-connected to the bottom of another set of synchronous wheels.

[0014] Furthermore, the width-adjustable push rod assembly includes an adjusting sleeve, a width-adapting adjusting rod is installed on one side wall of the adjusting sleeve, a plurality of groups of ratchets are evenly spaced on the outer wall of the width-adapting adjusting rod, a plurality of groups of ratchets are meshed and connected with pawls, and a push rod is installed on one side wall of the width-adapting adjusting rod; the width-adjustable push rod assembly also includes a bearing seat, two groups of bearings are installed in the bearing seat, a group of square nuts are installed on the outer wall of each group of bearings, two groups of bearing cover plates are symmetrically installed on both side walls of the bearing seat, and the outer wall of the adjusting sleeve is installed on the inner walls of the two groups of bearings.

[0015] Furthermore, an outer circle inner arc groove is provided on the inner wall of the adjusting sleeve, a pawl reset spring is installed on the outer wall of the pawl, and the pawl reset spring is installed in the outer circle inner arc groove.

[0016] Furthermore, one end of a compression spring is installed on one side wall of the push rod, and the other end of the compression spring is installed on one side wall of the adjusting sleeve. The compression spring is movably sleeved on the outer wall of the width adaptation adjusting rod. A slot is provided on the outer wall of the adjusting sleeve, and a pin is provided in the slot.

[0017] Furthermore, a handle is installed on the side wall of the adjusting sleeve away from the width adaptation adjusting rod, a lifting rod driving pin is installed on the outer wall of the adjusting sleeve, the output end of the lifting rod driving pin is affixed to the lifting rod limit block, a stopper is installed on one side wall of the bearing seat, a spring hanging rod is installed on the outer wall of the adjusting sleeve, and a tension spring is installed on the inner wall of the spring hanging rod.

[0018] The beneficial effects of the present invention are:

[0019] 1. Use a stepper motor to drive the pusher robot to solve the problem of push stability and lead frame position accuracy; design a ratchet and a ratchet adjustment rod to work together to quickly and conveniently adjust the contact position between the push rod and the frame so that the force point is located in the middle of the lead frame width.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of a material pushing mechanism according to an embodiment of the present invention is shown;

[0023] Figure 2 It shows a schematic structural diagram of a push drive assembly according to an embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of a width-adjustable push rod assembly according to an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram of the structure of an adjusting sleeve according to an embodiment of the present invention is shown.

[0026] In the figure: 1. Push drive assembly; 101. Slide rail mounting plate; 102. Slider mounting plate; 103. Slide rail; 104. Synchronous wheel; 105. Rotating shaft; 106. Flange bearing; 107. Bearing mounting plate; 108. Lifting rod limit block; 109. Belt pressure plate; 110. Induction sheet; 111. Groove radio and television sensor; 112. Synchronous belt; 113. Motor mounting plate; 114. Stepping motor; 2. Width Adjustable push rod assembly; 201, width adaptation adjustment rod; 202, bearing seat; 203, bearing; 204, bearing cover plate; 205, adjustment sleeve; 206, handle; 207, square nut; 208, push rod; 209, lifting rod drive pin; 210, spring hanging rod; 211, tension spring; 212, pin; 213, block; 214, pawl; 215, compression spring; 216, pawl return spring. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The embodiment of the present invention provides a convenient and adjustable pusher mechanism that can adapt to lead frames of different widths. It includes a pusher drive assembly 1, exemplarily, such as Figure 1 As shown, the push drive assembly 1 is provided with a width-adjustable push rod assembly 2 .

[0029] The mechanism is installed at the end of the film-passing track mechanism. After the last clamp of the film-passing track clamps the lead frame and transports it to the pushing position, the pushing mechanism pushes the lead frame out of the film-passing aisle smoothly and accurately.

[0030] For example, Figure 2 As shown, the push drive assembly 1 includes a slide rail mounting plate 101, a slide rail 103 is installed on one side wall of the slide rail mounting plate 101, a belt pressure plate 109 is slidably connected to the slide rail 103, a slider mounting plate 102 is installed on one side wall of the belt pressure plate 109, the bottom of the slider mounting plate 102 is slidably connected to the top of the slide rail mounting plate 101, a synchronous belt 112 is installed on the belt pressure plate 109, two sets of synchronous wheels 104 are meshed and connected on the inner wall of the synchronous belt 112, a lifting rod limit block 108 is installed on the top of the slide rail mounting plate 101, and a bearing mounting plate 107 is installed on the bottom of the lifting rod limit block 108 A flange bearing 106 is rotatably connected to the bearing mounting plate 107, a rotating shaft 105 is installed in the flange bearing 106, the top of the rotating shaft 105 is transmission-connected to the bottom of one group of the synchronous wheels 104, a sensing sheet 110 is installed on one side wall of the slide rail mounting plate 101, a grooved electric sensor 111 is installed on one side wall of the slide rail mounting plate 101 close to the sensing sheet 110, a motor mounting plate 113 is installed on the bottom of the slide rail mounting plate 101, a stepping motor 114 is installed on the bottom of the motor mounting plate 113, and the output end of the stepping motor 114 is transmission-connected to the bottom of another group of the synchronous wheels 104.

[0031] For example, Figure 3 and Figure 4As shown, the width adjustable push rod assembly 2 includes a bearing seat 202, two groups of bearings 203 are installed in the bearing seat 202, and a group of square nuts 207 are installed on the outer wall of each group of bearings 203, and two groups of bearing cover plates 204 are symmetrically installed on the two side walls of the bearing seat 202, and adjusting sleeves 205 are installed on the inner walls of the two groups of bearings 203. A width adaptation adjustment rod 201 is installed on one side wall of the adjusting sleeve 205, and an outer circle inner arc groove is opened on the inner wall of the adjusting sleeve 205. A plurality of groups of ratchet teeth are opened on the outer wall of the width adaptation adjustment rod 201 at equal intervals, and a plurality of groups of ratchet teeth are meshed and connected with pawls 214, and a pawl reset spring 216 is installed on the outer wall of the pawl 214, and the pawl reset spring 216 is installed in the outer circle inner arc groove. A push rod 208 is installed on it, one end of a compression spring 215 is installed on one side wall of the push rod 208, and the other end of the compression spring 215 is installed on one side wall of the adjusting sleeve 205. The compression spring 215 is movably sleeved on the outer wall of the width adaptation adjustment rod 201, and a slot is provided on the outer wall of the adjusting sleeve 205, and a pin 212 is provided in the slot. A handle 206 is installed on the side wall of the adjusting sleeve 205 away from the width adaptation adjustment rod 201, a lifting rod driving pin 209 is installed on the outer wall of the adjusting sleeve 205, and the output end of the lifting rod driving pin 209 is affixed to the lifting rod limit block 108, a stopper 213 is installed on one side wall of the bearing seat 202, a spring hanging rod 210 is installed on the outer wall of the adjusting sleeve 205, and a tension spring 211 is installed on the inner wall of the spring hanging rod 210.

[0032] The position of the width adaptation adjustment rod 201 in the adjustment sleeve 205 is adjusted to change the push-out contact position of the push rod 208 in the width direction of the contact lead frame; when adjusting the width, the tail end of the pawl 214 is pressed to disengage the pawl 214 and the ratchet, and the required extension length of the width adaptation adjustment rod 201 can be freely adjusted, and then the pawl 214 is released, and the pawl reset spring 216 makes the pawl 214 and the ratchet engage, that is, the width adaptation adjustment rod can be fixed; when narrowing, due to the unidirectional intermittent engagement movement characteristics of the pawl 214 and the ratchet, the width adaptation adjustment rod 201 can be adjusted to the desired position by directly holding the handle 206 and pulling it outward to the appropriate position.

[0033] The push drive assembly 1 drives the width-adjustable push rod assembly 2 to move to the origin position, and the lifting rod driving pin 209 on the adjusting sleeve 205 contacts the lifting rod limit block 108 to lift the push rod 208, and the track film clamping claw clamps the lead frame to pass under the push rod 208. When the lead frame is transported to the push position, the push drive assembly 1 drives the width-adjustable push rod assembly 2 to move toward the track exit. During the movement, due to the tension of the tension spring 211, the adjusting sleeve 205 rotates in the direction of the tension of the tension spring 211 and drives the push rod 208 to swing downward until the push rod 208 rotates to a height suitable for pushing and is limited by the stopper 213 on the bearing seat 202; at this time, the width-adjustable push rod assembly 2 continues to move toward the track exit, and the lead frame can be smoothly and accurately pushed out of the track to the desired position. Then the push drive assembly 1 moves back until the lifting rod driving pin 209 on the adjusting sleeve 205 contacts the lifting rod limit block 108 again to lift the push rod 208, waiting for the next lead frame to pass through, and repeats this process.

[0034] A stepper motor 114 is used to drive the pusher robot to solve the problem of push stability and position accuracy of the lead frame; a ratchet 214 and a ratchet adjustment rod are designed to cooperate to quickly and conveniently adjust the contact position between the pusher and the frame so that the force point is located in the middle of the width of the lead frame.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A conveniently adjustable pusher mechanism that can adapt to lead frames of different widths, comprising a pusher drive assembly (1), characterized in that: The push drive assembly (1) is provided with a width-adjustable push rod assembly (2); The push drive assembly (1) cooperates with the width-adjustable push rod assembly (2) to place the force point at the middle position of the lead frame width when pushing the material, and there is no need to replace parts to adapt to lead frames of different widths; The width-adjustable push rod assembly (2) comprises an adjusting sleeve (205), a width-adapting adjusting rod (201) is mounted on one side wall of the adjusting sleeve (205), a plurality of groups of ratchet teeth are arranged at equal intervals on the outer wall of the width-adapting adjusting rod (201), a plurality of groups of ratchet teeth are meshedly connected with pawls (214), and a push rod (208) is mounted on one side wall of the width-adapting adjusting rod (201); the width-adjustable push rod assembly (2) further comprises a bearing seat (202), two groups of bearings (203) are mounted in the bearing seat (202), a group of square nuts (207) are mounted on the outer wall of each group of bearings (203), two groups of bearing cover plates (204) are symmetrically mounted on the two side walls of the bearing seat (202), and the outer wall of the adjusting sleeve (205) is mounted on the inner walls of the two groups of bearings (203); An outer circle inner arc groove is formed on the inner wall of the adjusting sleeve (205), a pawl return spring (216) is mounted on the outer wall of the pawl (214), and the pawl return spring (216) is mounted in the outer circle inner arc groove; One end of a compression spring (215) is mounted on a side wall of the push rod (208), and the other end of the compression spring (215) is mounted on a side wall of the adjustment sleeve (205). The compression spring (215) is movably sleeved on the outer wall of the width adaptation adjustment rod (201). A slot is provided on the outer wall of the adjustment sleeve (205), and a pin (212) is provided in the slot. A handle (206) is installed on a side wall of the adjusting sleeve (205) away from the width adaptation adjusting rod (201); a lifting rod driving pin (209) is installed on the outer wall of the adjusting sleeve (205); an output end of the lifting rod driving pin (209) is attached to the lifting rod limit block (108); a stopper (213) is installed on a side wall of the bearing seat (202); a spring hanging rod (210) is installed on the outer wall of the adjusting sleeve (205); and a tension spring (211) is installed on the inner wall of the spring hanging rod (210); Drive the pusher robot to improve the push stability and position accuracy of the lead frame; through the cooperation of the pawl and the width adaptation adjustment rod with ratchet teeth, the contact position between the pusher and the frame can be quickly and conveniently adjusted so that the force point is located in the middle of the width of the lead frame.

2. According to claim 1, a conveniently adjustable pusher mechanism that can adapt to lead frames of different widths is characterized in that: The push drive assembly (1) comprises a slide rail mounting plate (101), a motor mounting plate (113) is mounted on the bottom of the slide rail mounting plate (101), and a stepper motor (114) is mounted on the bottom of the motor mounting plate (113); a slide rail (103) is mounted on a side wall of the slide rail mounting plate (101), and a belt pressure plate (109) is slidably connected to the slide rail (103).

3. The conveniently adjustable pusher mechanism that can adapt to lead frames of different widths according to claim 2 is characterized in that: A slider mounting plate (102) is mounted on one side wall of the belt pressure plate (109), and the bottom of the slider mounting plate (102) is slidably connected to the top of the slide rail mounting plate (101).

4. The conveniently adjustable pusher mechanism that can adapt to lead frames of different widths according to claim 2 is characterized in that: A synchronous belt (112) is installed on the belt pressure plate (109), two sets of synchronous wheels (104) are meshedly connected on the inner wall of the synchronous belt (112), and a lifting rod limit block (108) is installed on the top of the slide rail mounting plate (101).

5. The conveniently adjustable pusher mechanism that can adapt to lead frames of different widths according to claim 4 is characterized in that: A bearing mounting plate (107) is mounted on the bottom of the lifting rod limit block (108), a flange bearing (106) is rotatably connected to the bearing mounting plate (107), a rotating shaft (105) is mounted inside the flange bearing (106), and the top of the rotating shaft (105) is drivingly connected to the bottom of one set of the synchronous wheels (104).

6. The conveniently adjustable pusher mechanism that can adapt to lead frames of different widths according to claim 2 is characterized in that: A sensing sheet (110) is mounted on one side wall of the slide rail mounting plate (101), a grooved electrical sensor (111) is mounted on one side wall of the slide rail mounting plate (101) close to the sensing sheet (110), and the output end of the stepping motor (114) is drivingly connected to the bottom of another set of synchronous wheels (104).

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