A film cutting device for a winding machine

Abstract

The application discloses a film cutting device of a winding machine, which comprises a wire rail, a wire rail sliding block slidingly connected to the wire rail, a cutter seat, a cutter, a cutter seat mounting block and a reciprocating mechanism, the cutter seat mounting block is arranged on the wire rail sliding block through screw fastening, the cutter seat is reciprocatingly connected to the cutter seat mounting block through the reciprocating mechanism, and a cam groove is arranged in the cutter seat.

Description

Technical Field

[0001] This invention relates to the field of cutting equipment technology, and in particular to a film cutting device for a winding machine. Background Technology

[0002] In the production process of plastic film, a winding machine is used to wind the plastic film. When the plastic film reaches a certain thickness, it needs to be cut in a timely manner. The commonly used cutting method is to use a cutting blade. Traditional cutting uses a disc cutter, but in actual use, the cutting depth of the disc cutter is relatively shallow. When wrinkles accumulate in the plastic film, it becomes difficult to cut. The reason for this is that existing blades cut linearly along the guide rail direction. When encountering wrinkles, the film thickness suddenly increases, the film cut is blocked, and the cutting depth increases, making it impossible to cut in time. Meanwhile, the guide rail passes through the point quickly, resulting in failure to cut. Therefore, the reason why existing cutters cannot cut the film properly can be summarized as follows: existing film cutting equipment only cuts linearly along the guide rail direction and lacks auxiliary cutting in other directions, resulting in the inability to cut properly when wrinkles accumulate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing film cutting equipment in the prior art, which only performs linear cutting in the direction of the guide rail and does not have auxiliary cutting in other directions, thus causing the inability to cut normally when wrinkles accumulate. This invention provides a film cutting knife for a winding machine.

[0004] The objective of this invention is achieved through the following technical solution: a film cutting device for a winding machine, comprising a linear rail and a linear rail slider slidably connected to the linear rail; further comprising a cutter holder, a cutter, a cutter holder mounting block, and a reciprocating mechanism; the cutter holder mounting block is fastened to the linear rail slider by screws, and the cutter holder is slidably connected to the cutter holder mounting block reciprocally via the reciprocating mechanism; a cam groove is provided in the cutter holder; the reciprocating mechanism comprises a rack, a drive gear, a transmission gear set, a camshaft, a cam groove, and a cam; the rack is fixedly set in the groove of the linear rail, and the drive gear is rotatably connected to the linear rail slider via a rotating shaft and meshes with the rack; a gear groove is provided in the linear rail slider, and a transmission gear set is rotatably connected in the gear groove, one gear in the transmission gear set is set on the rotating shaft of the drive gear, the rotating shaft of one gear in the transmission gear set is a camshaft, the camshaft extends into the cam groove in the cutter holder, and a cam is fixedly set on the camshaft, the cam contacting the top of the cam groove.

[0005] Optionally, a dovetail-shaped slide rail is provided on the cutter holder mounting block, and a slider adapted to the slide rail (10) is provided at the bottom of the cutter holder, with the slider slidably disposed in the dovetail-shaped slide rail.

[0006] Optionally, a spring is provided inside the slide rail to hold the cutter holder in place.

[0007] Optionally, a cutter can be detachably and adjustablely connected to the cutter holder, and the cutter blade is configured to be sickle-shaped.

[0008] Optionally, the cutter holder is configured as a stepped seat, and a rotating sleeve is rotatably mounted on the cutter holder via a rotating shaft. A cutter is slidably mounted inside the sleeve of the rotating sleeve. The cutter includes a crescent-shaped cutting edge and a columnar handle. The columnar handle is provided with a keyway. The columnar handle is inserted into the rotating sleeve and fastened by a first fixing bolt. A second fixing bolt is provided on the cutter holder to fasten the rotating shaft of the rotating sleeve.

[0009] Optionally, the cutter has an outwardly convex arc-shaped cutting edge on its crescent-shaped cutting edge.

[0010] Optionally, the transmission ratio between the drive gear shaft and the camshaft is less than 1:10.

[0011] Optionally, the device can be used for cutting plastic films with a length of 5 meters or more.

[0012] This invention has the following advantages: This device performs both horizontal and vertical cutting actions simultaneously. While driving the cutter head horizontally, it also performs vertical reciprocating cutting. When wrinkles accumulate in the plastic film, the film is tightened during the horizontal cutting action of the cutter head. Through the up-and-down cutting motion, these wrinkles can be cut off. Just as when using a knife or sickle to cut an object, if a unidirectional cut is not possible, it is often made diagonally or vertically to increase the chance of a successful cut. This device utilizes this operation to cut these wrinkles, thus easily cutting plastic films that cannot be cut by a disc cutter. Furthermore, it avoids the impact on equipment operation caused by using motors or other equipment, making operation more convenient. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a cross-sectional view of the present invention.

[0016] In the figure, the linear guide (1), linear guide slider (2), cutter holder (3), cutter (4), first fixing bolt (5), rotating sleeve (6), second fixing bolt (7), limit pad (8), cutter holder mounting block (9), slide rail (10), gear groove (11), rack (12), drive gear (13), transmission gear set (14), camshaft (15), cam groove (16), cam (17), and spring (18). Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] like Figures 1 to 2The illustrated film cutting device for a winding machine includes a linear guide rail 1 and a linear guide slider 2 slidably connected to the linear guide rail 1. This device also includes a cutter holder 3, a cutter 4, a cutter holder mounting block 9, and a reciprocating mechanism. The cutter holder mounting block 9 is fastened to the linear guide slider 2 with screws to facilitate the installation of the plastic film cutter. The cutter holder 3 is slidably connected to the cutter holder mounting block 9 via the reciprocating mechanism, allowing the cutter 4 to move the cutter holder 3 horizontally via the linear guide rail 1 and the linear guide slider 2, and also to move the cutter holder 3 vertically back and forth on the cutter holder mounting block 9. To facilitate the horizontal cutting of the plastic film by the cutter 4, the reciprocating mechanism drives the cutter holder 3 to move vertically back and forth on the cutter holder mounting block 9. A cam groove 16 is provided inside the cutter holder 3 to assist its movement. In this device, the reciprocating mechanism that drives the cutter holder 3 to move the cutter 4 back and forth on the cutter holder mounting block 9 can be a motor that drives a cam in the cam groove 16 to push the cutter holder mounting block 9 up and down, or a motor can drive a reciprocating screw to drive the cutter holder 3 to move back and forth on the cutter holder mounting block 9.

[0021] In practice, for plastic film cutting with a horizontal cutting stroke of 2 to 3 meters, the above-mentioned motor-driven cam or reciprocating screw method is very convenient. However, when the horizontal cutting stroke exceeds 3 meters, there are film feeding devices, film winding machines, and other guiding rollers during cutting. The motor on the cutter holder mounting block 9, which carries a power cord, moves back and forth, which inevitably gets caught in other equipment and affects normal production. Therefore, the optimal choice is to satisfy the horizontal cutting while ensuring that the vertical reciprocating motion is not interfered with by other equipment besides the cutter holder 3.

[0022] This application provides a reciprocating mechanism that converts the power output provided by the sliding of the linear guide 1 into the reciprocating motion of the cutter holder 3 on the cutter holder mounting block 9. Specifically, the reciprocating mechanism includes a rack 12, a drive gear 13, a transmission gear set 14, a camshaft 15, a cam groove 16, and a cam 17. In this mechanism, the top side of the original dovetail-shaped groove is made horizontal. Then, the rack 12 is fixedly set in the groove of the linear guide 1, and the drive gear 13 is connected to the linear guide slider 2 through a rotating shaft and meshes with the rack 12. Thus, when the linear guide 1 is driven to slide by the screw, the fitting of the rack 12 and the drive gear 13 can convert the linear sliding of the linear guide slider 2 into the rotation of the drive gear 13, thereby driving the rotating shaft on the drive gear 13 to rotate. The power output is already in place; the next step is to transmit and transfer this rotation to the cutter holder 3 to drive its up and down movement without adding other equipment. This device features a gear groove 11 within the linear guide slider 2. A transmission gear set 14 is mounted within the gear groove 11 via a connecting mechanism. One gear in the transmission gear set 14 is mounted on the shaft of the drive gear 13. The shaft of the drive gear set 14 is a camshaft 15, which extends into a cam groove 16 within the cutter holder 3. A cam 17 is fixedly mounted on the camshaft 15, contacting the top of the cam groove 16. Thus, in this device, the rotation of the drive gear 13 is transmitted to the camshaft 15 via the transmission gear set 14. The camshaft 15 drives the cam 17 to rotate within the cam groove 16, thereby causing the entire cutter holder 3 to reciprocate up and down. In this entire structure, all components are concealed within the linear guide 1 and the cutter holder 3. No other equipment is added to the outside of the device, and the reciprocating motion of the cutter holder 3 is achieved without altering its appearance. This assists in the transverse cutting of the film, as well as the vertical cutting action, truly achieving simultaneous cutting and severing of the material film.

[0023] This device moves the cutter holder 3 laterally while simultaneously cutting vertically. When wrinkles accumulate in the plastic film, the film is tightened during the lateral cutting motion of the cutter holder 3. The up-and-down cutting action then cuts through these wrinkles. This is similar to how a knife or sickle is used to cut an object; if a single direction is insufficient, it is cut diagonally or vertically to increase the chance of a successful cut. This device utilizes this operation to cut these wrinkles, thus easily cutting plastic films that cannot be cut using a disc cutter.

[0024] Optionally, to facilitate the vertical positioning and sliding of the cutter holder 3, a dovetail-shaped slide rail 10 is provided on the cutter holder mounting block 9, and a slider adapted to the slide rail 10 is provided at the bottom of the cutter holder 3. The slider is slidably disposed in the dovetail-shaped slide rail 10.

[0025] In another embodiment, the downward movement of the cutter holder is achieved automatically, while the upward movement is achieved by the rotation of the cam 17. However, the automatic downward movement is relatively limited. Therefore, in this embodiment, a spring 18 is provided inside the slide rail 10 to hold the cutter holder 3 in place. In this way, the elastic force obtained by the spring 18 assists the downward movement, enabling a better and faster downward movement.

[0026] In another embodiment, to facilitate the replacement of the cutter 4, the cutter 4 is detachably and adjustablely connected to the cutter holder 3. Specifically, the cutter holder 3 is a stepped seat, and a rotating sleeve 6 is rotatably connected to the cutter holder 3 via a rotating shaft. The cutter 4 is slidably mounted inside the sleeve of the rotating sleeve 6. The cutter 4 includes a crescent-shaped cutting blade and a columnar handle. The columnar handle is provided with a keyway and is inserted into the rotating sleeve 6 and fastened by a first fixing bolt 5. A second fixing bolt 7 is provided on the cutter holder 3 to fasten the rotating shaft of the rotating sleeve 6.

[0027] In another embodiment, to better coordinate with the cutting action, the cutter 4 is designed in a sickle shape, and an outwardly convex arc-shaped cutting edge is provided on the crescent-shaped cutting edge of the cutter 4. Thus, when cutting laterally, the crescent-shaped cutting edge serves as the main cutting edge, while when the lateral cutting edge cannot cut properly, the outwardly convex arc-shaped cutting edge serves as an auxiliary cutting edge for vertical cutting, enabling better cutting.

[0028] In another embodiment, since a gear set is used for transmission and the lateral movement is converted into rotation, it is necessary to ensure that the transmission ratio between the drive gear 13 shaft and the camshaft 15 is less than 1:10. This constitutes an acceleration transmission mechanism, which can convert a small lateral displacement into a relatively fast rotation, provided that the motor torque of the linear guide 1 is sufficient, so that each step of the linear guide can satisfy one back-and-forth movement of the cutter holder 3.

[0029] In another embodiment, the device is used for cutting plastic film with a length of more than 5 meters. In this way, the back-and-forth movement of the cutter holder 3 is achieved without adding other equipment, avoiding the impact on the operation of the equipment caused by using motors and other equipment, and making the operation more convenient.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A film cutting device for a winding machine, comprising a linear rail (1) and a linear rail slider (2) slidably connected to the linear rail (1); characterized in that: it further comprises a cutter seat (3), a cutter (4), a cutter seat mounting block (9) and a reciprocating mechanism; the cutter seat mounting block (9) is fastened to the linear rail slider (2) by screws, and the cutter seat (3) is slidably connected to the cutter seat mounting block (9) by the reciprocating mechanism; a cam groove (16) is provided in the cutter seat (3); The reciprocating mechanism includes a rack (12), a drive gear (13), a transmission gear set (14), a camshaft (15), a cam groove (16), and a cam (17). The rack (12) is fixedly installed in the groove of the linear guide (1). The drive gear (13) is connected to the linear guide slider (2) via a rotating shaft and meshes with the rack (12). A gear groove (11) is provided in the linear guide slider (2). A transmission gear set (14) is connected to the gear groove (11). One gear in the transmission gear set (14) is installed on the rotating shaft of the drive gear (13). The rotating shaft of one gear in the transmission gear set (14) is a camshaft (15). The camshaft (15) extends into the cam groove (16) in the cutter holder (3). A cam (17) is fixedly installed on the camshaft (15). The cam (17) contacts the top of the cam groove (16).

2. The film cutting device for a winding machine according to claim 1, characterized in that: A dovetail-shaped slide rail (10) is provided on the cutter holder mounting block (9), and a slider adapted to the slide rail (10) is provided at the bottom of the cutter holder (3). The slider is slidably disposed in the dovetail-shaped slide rail (10).

3. The film cutting device for a winding machine according to claim 2, characterized in that: A spring (18) is installed inside the slide rail (10) to hold the cutter seat (3).

4. The film cutting device for a winding machine according to claim 3, characterized in that: A cutter (4) is detachably and adjustablely connected to the cutter holder (3), and the cutter (4) is sickle-shaped.

5. A film cutting device for a winding machine according to claim 4, characterized in that: The cutter seat (3) is set as a stepped seat. A rotating sleeve (6) is mounted on the cutter seat (3) via a rotating shaft. A cutter (4) is slidably mounted inside the sleeve of the rotating sleeve (6). The cutter (4) includes a crescent-shaped cutting blade and a columnar handle. A keyway is provided on the columnar handle. The columnar handle is inserted into the rotating sleeve (6) and fastened by a first fixing bolt (5). A second fixing bolt (7) is provided on the cutter seat (3) to fasten the rotating shaft of the rotating sleeve (6).

6. The film cutting device for a winding machine according to claim 5, characterized in that: The cutter (4) has an outwardly convex arc-shaped cutting edge on its crescent-shaped cutting edge.

7. The film cutting device for a winding machine according to claim 1, characterized in that: The transmission ratio between the shaft of the drive gear (13) and the camshaft (15) is less than 1:

10.

8. A film cutting device for a winding machine according to any one of claims 1 to 7, characterized in that: The film cutting device of the winding machine is used to cut plastic films with a length of 5 meters or more.

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