Slitting equipment for printing film

Abstract

The invention relates to slitting equipment for a printing film. The equipment comprises a bottom frame, an unwinding device, a transition roller and a recognition platform are arranged on the bottom frame, and a recognition device is arranged on the recognition platform. The recognition device comprises a CCD camera and a processor, the CCD camera can recognize images below and transmit the images to the processor, and the recognition platform is provided with two linear patterns which are perpendicular to each other so that the linear patterns can be recognized by the CCD camera and then converted into a standard coordinate system by the processor. And the CCD camera recognizes printing patterns which are vertically and horizontally printed on the printing film layer in the lower view field so that the processor can establish a data coordinate system, and the angle between the two coordinate systems is obtained. A rotating frame is arranged on the bottom frame, a slitting knife and a winding roller are arranged on the rotating frame in parallel, a rotating shaft is arranged on the portion, close to the recognition platform, of the rotating frame so that the rotating shaft can be arranged on the bottom frame in a swinging mode, and a driving mechanism is arranged on the bottom frame. Therefore, no matter which direction the plastic film layer deflects, the slitting knife and the winding roller can directly face the printing film layer for slitting and winding.

Description

Technical Field

[0001] The present invention relates to the technical field of film slitting, in particular to a slitting device for printed films. Background Art

[0002] Plastic film is often used in packaging, particularly for food. During printing, multiple designs (such as artwork, trademarks, etc.) are printed on the film in a series of rows and columns. The printed film is then rolled up into a printed film roll. Because the printed designs often appear in multiple rows and columns, the roll must be slit before use. For example, a single roll of film may only have a single row of printed designs.

[0003] When a printed film is wound into a film roll, or when it is laminated into a roll before slitting, it is inevitable that the rolled printed film roll will be skewed. This will cause the film to slit and the pattern on the slit film roll to be chaotic and incomplete, resulting in a waste product that cannot be used. In the existing technology, most of the skewed printed film rolls are rewound, but the rewinding process is also very troublesome, time-consuming and labor-intensive, and it is difficult to obtain a printed film roll that meets the lamination requirements. Because the skewed printed film roll is also skewed after it is unfolded, it needs to be corrected. However, the texture of the printed film is very soft, and conventional correction devices cannot correct it well. They can only axially move the skewed printed film roll and combine it with its intermittent flipping to loosen the printed film and slowly rewind it. The obtained rectified printed film roll is then cut, which is time-consuming and labor-intensive, and inefficient. Therefore, there is a need for a slitting device that can directly cut the skewed printed film roll. Summary of the Invention

[0004] The purpose of the present invention is to provide a slitting device for printed films to solve the above technical problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a slitting device for printed film, comprising a base frame, a reeling device provided on the base frame for installing and releasing the printed film roll; a transition roller and an identification platform provided on the base frame, the transition roller being used to guide the printed film layer, the identification platform being located below the printed film layer, and an identification device provided on the identification platform above the printed film layer; the identification device comprising a CCD camera and a processor, the CCD camera being able to identify the image below and transmit it to the processor, and two mutually perpendicular straight line patterns being provided on the identification platform for the CCD camera to identify and process after the image is removed. The device converts it into a standard coordinate system, and the CCD camera identifies the printed patterns printed vertically and horizontally on the printed film layer within the field of view below for the processor to establish a data coordinate system, and obtains the angle between the data coordinate system and the standard coordinate system, that is, the inclination angle of the printed pattern layer; a rotating frame is provided on the base frame, and a slitting knife and a winding roller are provided in parallel on the rotating frame. A rotating shaft is provided on the part of the rotating frame close to the identification platform, and the rotating frame is swung on the base frame through the rotating shaft. A driving mechanism is provided on the base frame to realize the swing of the rotating frame and the slitting knife and the winding roller thereon along the rotating shaft according to the above-mentioned inclination angle, so that the slitting knife and the winding roller can face the printed film layer for slitting and winding.

[0006] The swing amplitude of the rotating frame is obtained by the following method: 1) The CCD camera simultaneously recognizes the linear pattern on the recognition platform outside the printed film layer and the printed pattern on the printed film layer, and transmits the collected image information to the processor; 2) The processor recognizes the image information in step 1), establishes a standard coordinate system based on the recognized linear pattern information, and establishes a data coordinate system based on the recognized printed pattern arranged in an array on the plastic film layer; 3) Calculate the rotation deviation, i.e. the angle, between the standard coordinate system and the data coordinate system; 4) Adjust the swing angle of the rotating frame through this angle.

[0007] The straight line pattern is adhered, printed or engraved on the identification platform in a direction parallel to the transition roller.

[0008] A linear light emitting body is provided on the identification platform in a direction parallel to the transition roller, a lamp bead is provided inside the linear light emitting body, and a transparent pattern window is provided on the upper side of the linear light emitting body to form the linear pattern under the illumination of the lamp bead.

[0009] The rotating frame is provided with a main support column arranged opposite to the rotating shaft, and the base frame is provided with a first arc groove for guiding and moving the main support column during the swinging process of the rotating frame.

[0010] The lower end of the support column is provided with a universal wheel.

[0011] The rotating frame is further provided with at least two auxiliary support columns, and the base frame is provided with a second arc-shaped groove for guiding and moving the auxiliary support columns during the swinging process of the rotating frame.

[0012] The bottom of each auxiliary support column is also provided with a universal wheel.

[0013] The unwinding device includes two oppositely arranged rotating shafts rotatably arranged on a base frame, a driving motor for driving one of the rotating shafts to rotate is provided on the base frame, and each rotating shaft is connected to the central reel at the center of the printing film roll through a coupling.

[0014] The beneficial effects of the present invention are as follows: when a skewed printed film roll is being unwound, the vertical and horizontal printed patterns on the printed film layer are also in a skewed state. When the plastic film layer passes through the identification platform, the linear pattern below and the printed pattern on the plastic film are identified by the identification device, thereby establishing a standard coordinate system and a data coordinate system, respectively, and then obtaining the rotational deviation between the two coordinate systems, i.e., the skew angle of the printed film layer. The angle of the rotating frame can be adjusted at any time by using the skew angle, so that no matter in which direction the plastic film layer is skewed, the slitting knife and the winding roller can face the printed film layer for slitting and winding. The slitting equipment of the present invention can directly slit skewed printed film rolls, saving time and effort and being easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of a slitting device for printed films of the present invention; Figure 2 yes Figure 1 A partial enlarged view of point A in the middle; Figure 3 yes Figure 1 Schematic diagram of the structure at another angle; Figure 4 yes Figure 3 A partial enlarged view of point B in the middle; Figure 5 yes Figure 3 Schematic diagram of the structure at another angle; Figure 6 yes Figure 5 A partial enlarged view of point C in the middle; Figure 7 yes Figure 1 Schematic diagram when in use; Figure 8 yes Figure 7 A partial enlarged view of point D in the middle. DETAILED DESCRIPTION

[0016] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0017] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0018] An embodiment of a slitting device for printed film according to the present invention is as follows Figures 1-8 As shown, the apparatus comprises a base frame 1, on which a reeling device is mounted, for mounting and releasing a printing film roll 2. The reeling device employs the following structure: the reeling device comprises two opposing rotating shafts rotatably mounted on the base frame. A drive motor is mounted on the base frame to drive one of the rotating shafts. Each rotating shaft is connected to a central reel at the center of the printing film roll via a coupling. Installation can be achieved using a crane or other lifting device. The reeling of the printing film roll is achieved via the drive motor. In other embodiments, existing reeling devices may also be employed.

[0019] The chassis 1 is provided with a transition roller 3 and an identification platform 4. The transition roller 3 is used to guide the printed film layer 14. The identification platform 4 is located downstream of the transition roller 3 and below the printed film layer 14. The identification platform 4 is provided with an identification device above the printed film layer. The identification device includes a CCD camera 6 and a processor. Specifically, the identification platform 4 is provided with a horizontal mounting frame 5, and the CCD camera 6 is mounted on the horizontal mounting frame 5. The CCD camera 6 can recognize the image below and transmit it to the processor. The identification platform 4 is provided with two mutually perpendicular straight line patterns 7 for the CCD camera 6 to recognize and then convert to a standard coordinate system for the processor (see Figure 2). Figure 7 and 8 The CCD camera 6 identifies the printed pattern 8 printed vertically and horizontally on the printed film layer 14 within the field of view below so that the processor can establish a data coordinate system (see Appendix). Figure 7 and 8 X2 and Y2 in the image). The angle between the data coordinate system and the standard coordinate system, i.e., the inclination angle a of the printed pattern layer, is then determined. In this embodiment, a linear illuminator is disposed on the recognition platform 4 in a direction parallel to the transition roller. A lamp is disposed within the linear illuminator, and a transparent pattern window is provided on the upper side of the linear illuminator to form the aforementioned linear pattern under the illumination of the lamp.

[0020] In this embodiment, a rotating frame 9 is provided on the base frame 1. A slitting blade 10 and a winding roller 11 are provided parallel to the rotating frame 9. The slitting blade 10 and the winding roller 11 are conventionally known, and their specific structures are not described in detail in this embodiment. A rotating shaft 17 is provided on the rotating frame 9 near the identification platform. In other words, the rotating shaft 17 is eccentrically disposed on the rotating frame 9. The rotating frame 9 is swiveled on the base frame 1 via the rotating shaft 17. A drive mechanism is provided on the base frame to cause the rotating frame and the slitting blade and the winding roller thereon to swing along the rotating shaft according to the aforementioned tilt angle, so that the slitting blade and the winding roller can face the printed film layer for slitting and winding. Specifically, the drive mechanism includes a motor 18 provided on the base frame. A first gear is provided on the motor shaft of the motor, and a second gear is provided on the rotating shaft that meshes with the first gear. A gear train 19, consisting of the motor, the first gear, and the second gear, drives the rotating frame 9 to swing along the rotating shaft on the base frame.

[0021] The swing amplitude of the rotating frame is obtained by the following method: 1) The CCD camera simultaneously recognizes the linear pattern on the recognition platform outside the printed film layer and the printed pattern on the printed film layer, and transmits the collected image information to the processor; 2) The processor identifies the image information in step 1) and establishes a standard coordinate system (X1, Y1) based on the identified linear pattern information. It also establishes a data coordinate system (X2, Y2) based on the printed pattern arrayed on the plastic film layer. Specifically, the processor fits two mutually perpendicular simulated lines based on the two linear pattern information in the image information, and uses the perpendicular point of the two simulated lines as the coordinate origin of the standard coordinate system, and uses the two simulated lines as the X1 axis and Y1 axis. The pattern on the printed film layer in the CCD camera's field of view also exists in rows and columns, with the attached Figure 7 For example, the coordinates corresponding to each cluster are analyzed by the Blob analysis method, and two perpendicular simulation lines are fitted with the leftmost row of patterns and the topmost column of patterns in the field of view. The intersection of the two is the coordinate origin of the data coordinate system, and the two simulation lines are used as the X2 axis and Y2 axis.

[0022] 3) By comparing the two coordinate systems, the rotational deviation (i.e., the included angle) between the standard coordinate system and the data coordinate system is calculated. The included angle a between the extended lines of the X1 and X2 axes is calculated, which is the rotational deflection between the two coordinate systems, and therefore the skew angle of the printed film layer.

[0023] 4) Use this included angle to adjust the swing angle of the rotating frame. This means controlling the rotating frame and its slitting blade and take-up roller to rotate by angle a so that they face the pattern on the incoming printed film. Simply put, this means aligning the slitting blade and take-up roller with the pattern on the printed film.

[0024] The rotating frame 9 is equipped with a main support column 15, positioned opposite the rotation axis 17, to support the rotating frame. The base frame is provided with a first arcuate groove 12, which guides the main support column during the rotating frame's swing. Universal wheels are provided at the lower ends of the support columns to facilitate movement within the first arcuate groove. To better support the rotating frame, the rotating frame is also equipped with two auxiliary support columns 16. The base frame is provided with a second arcuate groove 13, which guides the auxiliary support columns during the rotating frame's swing. The bottom of each auxiliary support column 16 is also equipped with a universal wheel.

[0025] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0027] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0028] In other embodiments of the present invention, the straight line pattern may also be a pattern pasted, printed, or engraved on the recognition platform in a direction parallel to the transition roller. In this case, the Canny edge detection method may be used to find the edge of the straight line pattern for feature extraction, and then the Hough transform method may be used to detect long and straight features from the features, and then a virtual straight line may be fitted to construct a coordinate system.

Claims

1. A slitting device for printed film, characterized in that: It includes a base frame, on which a reeling device is provided for installing and releasing the printed film roll; a transition roller and an identification platform are provided on the base frame, the transition roller is used to guide the printed film layer, the identification platform is located below the printed film layer, and an identification device is provided on the identification platform above the printed film layer; the identification device includes a CCD camera and a processor, the CCD camera can identify the image below and transmit it to the processor, and two mutually perpendicular straight line patterns are provided on the identification platform for the CCD camera to identify and then convert into a standard coordinate system for the processor, and the CCD camera identifies the field of view below The printed pattern printed vertically and horizontally on the inner printed film layer is used by the processor to establish a data coordinate system, and the angle between the data coordinate system and the standard coordinate system, that is, the inclination angle of the printed pattern layer, is calculated; a rotating frame is provided on the base frame, and a slitting knife and a winding roller are provided in parallel on the rotating frame. A rotating shaft is provided on the part of the rotating frame close to the identification platform, and the rotating frame is swung on the base frame through the rotating shaft. A driving mechanism is provided on the base frame to realize the swing of the rotating frame and the slitting knife and winding roller thereon along the rotating shaft according to the above-mentioned inclination angle, so that the slitting knife and the winding roller can face the printed film layer for slitting and winding.

2. The printed film slitting device according to claim 1, characterized in that: The swing amplitude of the rotating frame is obtained by the following method: 1) The CCD camera simultaneously recognizes the linear pattern on the recognition platform outside the printed film layer and the printed pattern on the printed film layer, and transmits the collected image information to the processor; 2) The processor recognizes the image information in step 1), establishes a standard coordinate system based on the recognized linear pattern information, and establishes a data coordinate system based on the recognized printed pattern arranged in an array on the plastic film layer; 3) Calculate the rotation deviation, i.e. the angle, between the standard coordinate system and the data coordinate system; 4) Adjust the swing angle of the rotating frame through this angle.

3. The printed film slitting device according to claim 1, characterized in that: The straight line pattern is adhered, printed or engraved on the identification platform in a direction parallel to the transition roller.

4. The printed film slitting device according to claim 1, characterized in that: A linear light emitting body is provided on the identification platform in a direction parallel to the transition roller, a lamp bead is provided inside the linear light emitting body, and a transparent pattern window is provided on the upper side of the linear light emitting body to form the linear pattern under the illumination of the lamp bead.

5. The printed film slitting device according to any one of claims 1 to 4, characterized in that: The rotating frame is provided with a main support column arranged opposite to the rotating shaft, and the base frame is provided with a first arc groove for guiding and moving the main support column during the swinging process of the rotating frame.

6. The printed film slitting device according to claim 5, characterized in that: The lower end of the support column is provided with a universal wheel.

7. The printed film slitting device according to claim 5, characterized in that: The rotating frame is further provided with at least two auxiliary support columns, and the base frame is provided with a second arc groove for guiding and moving the auxiliary support columns during the swinging process of the rotating frame.

8. The printed film slitting device according to claim 7, characterized in that: The bottom of each auxiliary support column is also provided with a universal wheel.

9. The printed film slitting device according to claim 1, characterized in that: The unwinding device includes two oppositely arranged rotating shafts rotatably arranged on a base frame, a driving motor for driving one of the rotating shafts to rotate is provided on the base frame, and each rotating shaft is connected to the central reel at the center of the printing film roll through a coupling.

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