Micro metal elastic sheet feeding mechanism

Abstract

The invention provides a miniature metal elastic sheet feeding mechanism, and belongs to the technical field of precision machining. Comprising a ground rail, an upper die and an end limiting assembly, the metal elastic piece is flatly laid on the ground rail, the upper die is located on the ground rail, a feeding channel allowing the metal elastic piece to move horizontally along the ground rail is formed between the upper die and the ground rail, a mounting hole is formed in the upper die, an eccentric roller is rotationally connected into the mounting hole, and the axis of the eccentric roller is parallel to the feeding direction of the ground rail; a plurality of first convex ribs are arranged on the circumferential face of the telecentric position of the eccentric roller at intervals, an inclination angle of 5-15 degrees is formed between the first convex ribs and the axis of the eccentric roller, the upper die is provided with a guide groove penetrating through the mounting hole and the die face of the upper die, a pressing strip is longitudinally and slidably connected into the guide groove, and the eccentric roller can abut against the upper surface of the pressing strip. An elastic piece for driving the upper surface of the pressing strip to tightly press the peripheral surface of the eccentric wheel is arranged between the pressing strip and the inner wall of the mounting hole. The feeding device has the advantages of being capable of feeding accurately and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of precision machining and relates to a feeding mechanism for micro metal shrapnel. Background Art

[0002] The laser head in a DVD drive is fixed by a metal sheet. The size of the metal sheet is in millimeters. There is an installation hole in the middle of it. Setting the metal sheet to install the laser head (light source) can improve its reliability, including material isolation from the housing, improvement of anti-vibration performance, provision of heat dissipation space, etc. In essence, it is a metal shrapnel. For workpieces of this centimeter level, the vibration feeding method is generally used to convey them along the track to achieve feeding. However, since the metal shrapnel in the DVD drive is extremely small in size (less than one centimeter in length and about 50 microns in thickness), and is in a multi-segment bent style, it is easy to stack when conveyed along the track, and it is difficult to identify whether it is stacked. When taking materials by negative pressure, it may be carried or dropped after taking materials, which not only causes waste of workpieces, but also easily falls into the equipment gap and causes other impacts; in the material taking and feeding technology, small-sized workpieces can also be taken by negative pressure in cooperation with vision technology, but this method is generally only suitable for flat workpieces or workpieces in a flat state (such as having a probability of being in a flat state through vibration). Therefore, there are technical problems in taking and feeding regular bent micro metal shrapnel.

[0003] In addition, since there are stamping-formed installation small holes in the middle of the metal shrapnel on the DVD drive, burrs or small flash are formed at the installation small holes on the back of the shrapnel after stamping. It is not convenient to process them during stamping. Generally, they are removed by centralized polishing, and it cannot be ensured that they are completely removed. The possible burrs or flash not only affect the accuracy of material taking, installation and feeding, but also form product quality defects (remaining in the assembly) after being installed into the DVD drive assembly. Summary of the Invention

[0004] The object of the present invention is to provide a feeding mechanism for micro metal shrapnel in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is how to accurately drive the thin sheet to feed.

[0005] The object of the present invention can be achieved by the following technical solutions: A micro metal shrapnel feeding mechanism includes a ground rail, an upper die, and an end limiting component. The metal shrapnel is laid flat on the ground rail, the upper die is located above the ground rail, and a feeding channel allowing the metal shrapnel to translate along the ground rail is formed between the upper die and the ground rail. There is an installation hole in the upper die, and an eccentric roller is rotatably connected in the installation hole. The axis of the eccentric roller is parallel to the feeding direction of the ground rail. A number of first ribs are arranged at intervals on the circumferential surface of the eccentric part of the eccentric roller. The first ribs form an angle of 5-15° with the axis of the eccentric roller. The upper die has a guide groove penetrating through the installation hole and the die surface of the upper die. A pressure bar is longitudinally slidably connected in the guide groove. The eccentric roller can press against the upper surface of the pressure bar. The upper surface of the pressure bar has a second rib perpendicular to the axis of the eccentric roller. An elastic member is arranged between the pressure bar and the inner wall of the installation hole to drive the upper surface of the pressure bar to press against the circumferential surface of the eccentric wheel.

[0006] Furthermore, the elastic member includes a metal frame fixed at the connection position of the installation hole and the guide groove. Each of the four edges of the metal frame has a guiding elastic piece.

[0007] Furthermore, the positioning hole on the metal shrapnel is located below the pressure bar.

[0008] Furthermore, the pressure bar is an elastic rubber member, and the lower surface of the pressure bar has a friction layer.

[0009] Furthermore, the limiting component includes a cylinder, a vertical limiting piece on the push rod of the cylinder, and a horizontal limiting piece vertically fixed on the vertical limiting piece.

[0010] The logic of this solution is as follows: By pressing the metal elastic sheet to make it closely adhere to the ground rail, and then driving it to move on the ground rail, this method can ensure that each metal elastic sheet lies flat, without overlapping or causing deformation of the metal elastic sheet. Instead, it corrects its shape. In addition, the metal elastic sheets are individually picked up at the end of the ground rail. The rotation of the eccentric roller is continuous, and the pushing force formed on the metal elastic sheets is intermittent, which is not synchronized with the picking frequency of the ground rail. That is, there are two states. One is when there is a space behind the ground rail that allows the workpiece to move backward, that is, after a metal elastic sheet is taken away from the end of the ground rail, at this time it is in the feeding state. When the eccentric point of the eccentric roller approaches the pressure bar, it will drive the pressure bar to move downward, thereby pressing the workpiece. At the same time, the rib 1 at the eccentric part of the eccentric roller can interact with the rib 2 to drive the pressure bar to move slightly backward along the ground rail, thereby pushing the workpiece to move backward along the ground rail in a pressed state. The other state is when the workpieces on the ground rail are all in a state of abutting against each other and no workpiece has been taken away from behind the ground rail. At this time, it is in the grinding state. When the eccentric point of the eccentric roller approaches the pressure bar, it will drive the pressure bar to move downward, thereby pressing the workpiece. At the same time, the rib 1 at the eccentric part of the eccentric roller can interact with the rib 2 to drive the pressure bar to move slightly backward along the ground rail. Since the workpiece cannot move backward, at this time, the friction layer of the pressure bar grinds the surface of the workpiece where the mounting hole is located, eliminating the burrs and rough edges on the back of the mounting hole formed by stamping. The slag generated during the grinding process can be discharged along both sides of the material feeding channel to ensure the smooth surface of the metal elastic sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of this material feeding mechanism.

[0012] Figure 2 is a cross-sectional view of the ground rail and the upper die in the assembled state.

[0013] Figure 3 is an exploded view of the ground rail and the upper die.

[0014] Figure 4 A three-dimensional schematic diagram of the eccentric roller, the pressure bar, and the elastic member.

[0015] Figure 5 is a three-dimensional view of the metal elastic sheet.

[0016] In the figure, 1, ground rail; 2, upper die; 21, mounting hole; 22, eccentric roller; 23, rib 1; 24, guide groove; 25, pressure bar; 26, rib 2; 3, metal elastic sheet; 31, positioning hole; 4, elastic member; 41, metal frame; 42, guiding elastic sheet; 51, cylinder; 52, vertical limiting sheet; 53, horizontal limiting sheet. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following are specific embodiments of the present invention in combination with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0018] As shown Figures 1 to 5 in the figure, it includes a ground rail 1, an upper die 2 and an end limiting component. The metal shrapnel 3 is laid flat on the ground rail 1. The upper die 2 is located above the ground rail 1. A feeding channel allowing the metal shrapnel 3 to translate along the ground rail 1 is formed between the upper die 2 and the ground rail 1. There is an installation hole 21 in the upper die 2. An eccentric roller 22 is rotatably connected in the installation hole 21. The axis of the eccentric roller 22 is parallel to the feeding direction of the ground rail 1. A number of first ribs 23 are arranged at intervals on the circumferential surface of the eccentric roller 22 at the far center. The first ribs 23 form an inclination angle of 5-15° with the axis of the eccentric roller 22. There is a guide groove 24 on the upper die 2 that penetrates through the installation hole 21 and the die surface of the upper die 2. A pressure bar 25 is longitudinally slidably connected in the guide groove 24. The eccentric roller 22 can press against the upper surface of the pressure bar 25. There is a second rib 26 perpendicular to the axis of the eccentric roller 22 on the upper surface of the pressure bar 25. An elastic member 4 is arranged between the pressure bar 25 and the inner wall of the installation hole 21 to drive the upper surface of the pressure bar 25 to tightly press against the circumferential surface of the eccentric wheel.

[0019] The elastic member 4 includes a metal frame 41 fixed at the connection position of the installation hole 21 and the guide groove 24. There is a guiding elastic piece 42 at each of the four edges of the metal frame 41. The guiding elastic piece 42 can allow the pressure bar 25 to move a certain distance along the length direction of the ground rail 1 and then reset, and can also allow the pressure bar 25 to press down a certain distance and then reset upward. Therefore, the elastic member 4 is a structure that can predict the movement range of the pressure bar 25 and drive it to press tightly against the eccentric roller 22 in the middle.

[0020] The positioning hole 31 on the metal shrapnel 3 is located below the pressure bar 25. The burrs formed after stamping the positioning hole 31 are on the upper surface of the metal shrapnel 3 after it is laid flat on the ground rail 1.

[0021] The pressure bar 25 is an elastic rubber part. There is a friction layer on the lower surface of the pressure bar 25. The friction layer is a sand belt or felt, which is fixedly attached to the lower surface of the pressure bar 25.

[0022] The limiting component includes a cylinder 51, a vertical limiting piece 52 on the push rod of the cylinder 51 and a horizontal limiting piece 53 vertically fixed on the vertical limiting piece 52. After the push rod of the cylinder 51 moves upward, the longitudinal limiting piece and the horizontal limiting piece 53 release the metal shrapnel 3 at the end of the ground rail 1, and the metal shrapnel 3 can be taken away. After taking it away and pressing it down again, the end and the upper surface of the metal shrapnel 3 are limited.

[0023] The logic of this solution is as follows: By pressing the metal elastic sheet 3 to make it closely adhere to the ground rail 1, and then driving it to move on the ground rail 1, this method can ensure that each metal elastic sheet 3 lies flat without overlapping or causing deformation of the metal elastic sheet 3. Instead, it corrects its shape. In addition, the metal elastic sheets 3 are taken out one by one at the end of the ground rail 1. The rotation of the eccentric roller 22 is continuous, and the pushing force formed on the metal elastic sheets 3 is intermittent, which is not synchronized with the feeding frequency of the ground rail 1. That is, there are two states. One is when there is a space behind the ground rail 1 that allows the workpiece to move backward, that is, after one metal elastic sheet 3 is taken away from the end of the ground rail 1, at this time it is in the feeding state. When the eccentric point of the eccentric roller 22 approaches the pressure bar 25, it will drive the pressure bar 25 to move downward, thereby pressing the workpiece. At the same time, the rib 23 at the eccentric part of the eccentric roller 22 can act with the rib 26 to drive the pressure bar 25 to move slightly backward along the ground rail 1, thereby pushing the workpiece to move backward along the ground rail 1 in the pressed state; the other state is when the workpieces on the ground rail 1 are all in a state of abutting against each other and no workpiece has been taken away behind the ground rail 1. At this time, it is in the grinding state. When the eccentric point of the eccentric roller 22 approaches the pressure bar 25, it will drive the pressure bar 25 to move downward, thereby pressing the workpiece. At the same time, the rib 23 at the eccentric part of the eccentric roller 22 can act with the rib 26 to drive the pressure bar 25 to move slightly backward along the ground rail 1. Since the workpiece cannot move backward, at this time, the friction layer of the pressure bar 25 grinds the surface of the workpiece where the mounting hole 21 is located to eliminate the burrs and rough edges on the back of the mounting hole 21 formed by stamping. The slag generated during the grinding process can be discharged along both sides of the material feeding channel to ensure the flatness of the surface of the metal elastic sheet 3.

[0024] The specific embodiments described in this article are only illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A micro metal shrapnel feeding mechanism, characterized in that, It includes a ground rail (1), an upper die (2) and an end limiting component. The metal shrapnel (3) is laid flat on the ground rail (1), and the upper die (2) is located above the ground rail (1). A feeding channel allowing the metal shrapnel (3) to translate along the ground rail (1) is formed between the upper die (2) and the ground rail (1). There is an installation hole (21) in the upper die (2), and an eccentric roller (22) is rotatably connected in the installation hole (21). The axis of the eccentric roller (22) is parallel to the feeding direction of the ground rail (1). A number of first convex ribs (23) are arranged at intervals on the circumferential surface of the eccentric roller (22) at the eccentric position. The first convex ribs (23) form an inclination angle of 5-15° with the axis of the eccentric roller (22). There is a guide groove (24) on the upper die (2) that penetrates the installation hole (21) and the die surface of the upper die (2). A pressure bar (25) is longitudinally slidably connected in the guide groove (24). The eccentric roller (22) can press against the upper surface of the pressure bar (25). The upper surface of the pressure bar (25) has a second convex rib (26) perpendicular to the axis of the eccentric roller (22). An elastic member (4) is arranged between the pressure bar (25) and the inner wall of the installation hole (21) to drive the upper surface of the pressure bar (25) to press tightly against the circumferential surface of the eccentric wheel.

2. The micro metal shrapnel feeding mechanism according to claim 1, characterized in that The elastic member (4) includes a metal frame (41) fixed at the connection position of the installation hole (21) and the guide groove (24). Four edges of the metal frame (41) are respectively provided with a guiding elastic sheet (42).

3. The micro metal shrapnel feeding mechanism according to claim 2, characterized in that, The positioning hole (31) on the metal shrapnel (3) is located below the pressure bar (25).

4. The micro metal shrapnel feeding mechanism according to claim 2, characterized in that, The pressure bar (25) is an elastic rubber member, and a friction layer is provided on the lower surface of the pressure bar (25).

5. The micro metal shrapnel feeding mechanism according to claim 2, characterized in that, The limiting component includes a cylinder (51), a vertical limiting sheet (52) on the push rod of the cylinder (51), and a horizontal limiting sheet (53) vertically fixed on the vertical limiting sheet (52).

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