Label front and back printing turnover mechanism for flexo printing machine

Abstract

The utility model discloses a label front and back overprinting turnover mechanism for a flexo printing machine. The label front and back overprinting turnover mechanism mainly solves the technical problems that an existing front and back overprinting method is high in rejection rate, high in production cost and the like. On the basis of an existing flexographic printing machine, the flexographic printing machine further comprises an overturning unit and a front and back tracking assembly. The overturning unit comprises a base and an overturning frame; the base is mounted on the rack; the overturning frame comprises a first supporting plate, a second supporting plate, a first paper guide roller and an overturning assembly. The first supporting plate and the second supporting plate are vertically installed on the base. The two ends of the first paper guide roller are connected with the ends, close to the base, of the first supporting plate and the second supporting plate correspondingly. The front and back tracking assembly comprises a supporting seat and a photoelectric tracker; the supporting seat is mounted on the base; the photoelectric tracker is installed on the supporting base, the light-emitting face is close to the roller face of the first paper guide roller, and the included angle between the optical axis of light emitted by the photoelectric tracker and the central axis of the first paper guide roller ranges from 60 degrees to 120 degrees.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flexographic printing machine, concretely relates to a label front and back overprint turnover mechanism for flexographic printing machine. BACKGROUND

[0002] The flexographic printing machine uses fluid ink with strong fluidity, the ink is transferred to the graphic part of the printing plate by the ink fountain roller and the anilox roller, and then the ink is inked, then the printing pressure is applied by the pressure roller, the ink on the printing plate is transferred to the printing material, and finally the printing process is completed by the drying surface.

[0003] When the flexographic printing machine is used to produce film label products, the production process of most film label products is basically more than six colors, and usually needs front and back printing and online gluing. However, in the front and back printing process, the film material is easy to be stretched and deformed, or the film material is easy to be blocked by air holes due to suspension and shaking on the turnover frame, or the device tension is unstable due to the change of tension in the roll changing process, which causes the front and back overprint position of the film label product to be dislocated, thereby affecting the production and processing of the later process, and finally affecting the product quality.

[0004] In view of the above problems, the current common method is to visually inspect the color group and the winding part of the film label product by the operator, and then manually adjust the position of the front and back printing, so that the front and back printing positions correspond. However, the yield of the product is low by using this method, and according to statistics, when the equipment is not stopped for roll changing, about 50-100m of waste product will be generated due to poor front and back overprint, and when the equipment is stopped for roll changing, 150-250m of waste product will be generated. Therefore, the waste rate of the existing method is high, and the production cost is also significantly increased. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the technical problems of high waste rate and high production cost of the existing front and back overprint method, and provides a label front and back overprint turnover mechanism for a flexographic printing machine.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0007] A label front and back overprint turnover mechanism for a flexographic printing machine, characterized in that:

[0008] The turnover mechanism comprises a turnover unit and a front and back tracking assembly;

[0009] The turnover unit comprises a base and a turnover frame mounted on the base; the turnover frame comprises a first support plate, a second support plate, a first paper guide roller and a turnover assembly;

[0010] The first support plate and the second support plate are arranged in parallel and are respectively installed vertically on the base; the first paper guide roller is located between the first support plate and the second support plate, and two ends thereof are respectively connected with the first support plate and the second support plate at the end close to the base, and a gap is left between the roller surface of the first paper guide roller and the base; the turnover assembly is installed between the first support plate and the second support plate and is used for turning over the to-be-printed film product;

[0011] The front-back tracking assembly comprises a support seat and a photoelectric tracker; the support seat is installed on the base; the photoelectric tracker is installed on the support seat, and the light emitting surface is close to the roller surface of the first paper guide roller and is used for collecting the photosensitive point on the to-be-printed film product passing through the first paper guide roller; the angle between the optical axis of the light emitted by the photoelectric tracker and the central axis of the first paper guide roller is 60°-120°.

[0012] Further, the angle between the optical axis of the light emitted by the photoelectric tracker and the central axis of the first paper guide roller is 90°; the light emitting surface of the photoelectric tracker is parallel to the central axis of the first paper guide roller, and the distance D between them is R+(5-15)mm, wherein R is the radius of the first paper guide roller.

[0013] Further, the distance D between the light emitting surface of the photoelectric tracker and the central axis of the first paper guide roller is R+10mm.

[0014] Further, it further comprises a display unit, and the display unit is electrically connected with the photoelectric tracker.

[0015] Further, the detection distance of the photoelectric tracker is 200-2000mm, the detection response time is ≤0.5ms, the residual ripple is <5V, the light spot is φ1mm-φ1.5mm, the working voltage is 10-30VDC, and the sensing distance is 0-7m. SS

[0016] Further, the support seat is in sliding connection with the base, and the sliding direction is consistent with the axial direction of the first paper guide roller.

[0017] Further, the turnover assembly comprises a first turnover roller, a second turnover roller, a second paper guide roller and a third paper guide roller.

[0018] The first turnover roller and the second turnover roller are located between the first support plate and the second support plate, are perpendicular to each other, and have a radial gap between the roller surfaces; wherein the two ends of the first turnover roller are respectively connected with the lower end of the first support plate and the upper end of the second support plate, and the two ends of the second turnover roller are respectively connected with the upper end of the first support plate and the lower end of the second support plate.

[0019] The second paper guide roller has two, is installed on the outer side of the first support plate and the second support plate and is perpendicular to the central axis of the first paper guide roller. ​

[0020] The two ends of the third paper guide roller are connected with the first support plate and the second support plate respectively, and are away from the one end of the base and parallel to the central axis of the first paper guide roller.

[0021] The utility model discloses compared with prior art has beneficial effects is:

[0022] 1. The utility model discloses a positive and back tracking assembly is installed on the base, and the photosensitive point on the film product to be printed that passes through the first paper guide roller is collected through the photoelectric tracker, and the printing position of the positive and back of the film product to be printed can be accurately obtained, which provides accurate theoretical basis for the position adjustment of the positive and back printing, and further reduces the waste rate and saves production cost.

[0023] 2. The utility model discloses the included angle of the optical axis of the photoelectric tracker exit light and the central axis of the first paper guide roller is 90 DEG, and the light exit surface of the photoelectric tracker is parallel to the central axis of the first paper guide roller at this time, and the distance D between the two is equal to R plus (5-15) mm, and the position setting can guarantee that the photoelectric tracker has higher collection accuracy.

[0024] 3. The utility model discloses still include the display unit of photoelectric tracker electricity connection, thereby can real -time observation each color group's position, thereby improve the printing quality of product.

[0025] 4. The utility model discloses the support seat and base sliding connection, thereby can be applicable to the observation of different size product printing process, and the application scope is wider. DRAWINGS

[0026] Figure 1 It is the structure schematic drawing of a label positive and back tracking printing turnover mechanism for the flexographic printing machine embodiment of the utility model.

[0027] The signs are as follows:

[0028] 1-base, 2-first support plate, 3-second support plate, 4-first paper guide roller, 5-support seat, 6-photoelectric tracker, 7-first turnover roller, 8-second turnover roller, 9-second paper guide roller, 10-third paper guide roller. DETAILED DESCRIPTION

[0029] In order to make the purpose, the advantages and the characteristics of the utility model more clear, the following combines the drawings and the specific embodiment to make further detailed description to the utility model.

[0030] As Figure 1 The utility model discloses a label positive and back tracking printing turnover mechanism for the flexographic printing machine, wherein, the flexographic printing machine is similar with the existing flexographic printing machine structure, such as the source iron 370-12C multifunctional flexographic printing machine, and the embodiment can be used on the flexographic printing machine, and specifically includes turnover unit, positive and back tracking assembly and display unit.

[0031] The turnover unit comprises a base 1 and a turnover frame, wherein the base 1 is installed on the frame of the flexographic printing machine for supporting the turnover frame. The turnover frame comprises a first support plate 2, a second support plate 3, a first paper guide roller 4 and a turnover assembly. The first support plate 2 and the second support plate 3 are arranged in parallel and are respectively installed vertically on the base 1; the first paper guide roller 4 is located between the first support plate 2 and the second support plate 3, and the two ends thereof are respectively connected to the ends of the first support plate 2 and the second support plate 3 close to the base 1, and a gap is left between the roller surface of the first paper guide roller 4 and the base 1.

[0032] The turnover assembly is installed between the first support plate 2 and the second support plate 3 for turning over the film product to be printed, and comprises a first turnover roller 7, a second turnover roller 8, a second paper guide roller 9 and a third paper guide roller 10. The first turnover roller 7 and the second turnover roller 8 are located between the first support plate 2 and the second support plate 3, are perpendicular to each other, and a radial gap is left between the roller surfaces thereof; wherein the two ends of the first turnover roller 7 are respectively connected to the lower end of the first support plate 2 and the upper end of the second support plate 3, and the two ends of the second turnover roller 8 are respectively connected to the upper end of the first support plate 2 and the lower end of the second support plate 3, which cooperate with each other to realize the turnover of the film product to be printed, so as to complete the printing of the front and back contents in cooperation with the flexographic printing unit.

[0033] The second paper guide roller 9 has two, which are respectively installed on the outer sides of the first support plate 2 and the second support plate 3 and are perpendicular to the central axis of the first paper guide roller 4. The two ends of the third paper guide roller 10 are respectively connected to the ends of the first support plate 2 and the second support plate 3 away from the base 1, and are parallel to the central axis of the first paper guide roller 4.

[0034] When the film product to be printed passes through the turnover frame, it is turned over once by passing through the first paper guide roller 4, the first turnover roller 7, one of the second paper guide rollers 9, the second turnover roller 8 and the third paper guide roller 10 in sequence; or, it is turned over once by passing through the third paper guide roller 10, the second turnover roller 8, one of the second paper guide rollers 9, the first turnover roller 7 and the first paper guide roller 4 in sequence, and then the printing is completed in combination with other modules of the flexographic printing machine.

[0035] The front-back tracking assembly comprises a support seat 5 and a photoelectric tracker 6; the support seat 5 is installed on the base 1; the photoelectric tracker 6 is installed on the support seat 5, and the light emitting surface thereof is close to the roller surface of the first paper guide roller 4, for collecting the light sensitive point on the film product to be printed passing through the first paper guide roller 4; a display unit is electrically connected to the photoelectric tracker 6, and can display the information collected by the photoelectric tracker 6 in real time.

[0036] The photosensitive points described in this embodiment are multiple and can be pre-set at corresponding positions on one side of the film product to be printed, according to the specific pattern of the product. In actual use, the photosensitive points are used as reference points, and the photoelectric tracker 6 collects the precise position of the corresponding photosensitive points before flipping. The correspondence between the front and back patterns can be adjusted according to the position.

[0037] The angle between the optical axis of the light emitted from the photoelectric tracker 6 and the central axis of the first paper guide roller 4 is 60° to 120°. The optimal acquisition accuracy is achieved when the angle is 90°. At this angle, the light-emitting surface of the photoelectric tracker 6 is parallel to the central axis of the first paper guide roller 4, and the distance between them is D = R + (5 to 15) mm, where R is the radius of the first paper guide roller 4.

[0038] In this embodiment, the specific parameters of the photoelectric tracker 6 are selected as follows: detection distance of 200-2000mm, detection response time ≤0.5ms, and residual ripple <5V. SS The light spot size is φ1mm~φ1.5mm, the operating voltage is 10~30VDC, and the sensing distance is 0~7m. Of course, appropriate photoelectric trackers or other devices that can achieve the same function can also be selected according to actual needs.

[0039] To accommodate products of different sizes (width, thickness, etc.), the support 5 is slidably connected to the base 1, and the sliding direction is consistent with the axial direction of the first guide roller 4.

[0040] In this embodiment, the photoelectric tracker 6 is used as follows: First, the corresponding pattern is printed on the side (back) of the film product to be printed, where adhesive needs to be applied. Before this, the specific installation position and angle of the photoelectric tracker 6 need to be adjusted, and corresponding photosensitive points are pre-set at corresponding positions on one side of the film product to be printed. After the back side is printed, it is flipped by the flipping frame. Since there is sufficient space for the product before it enters the next color group after being flipped by the flipping frame, and the paper path is relatively vertical with minimal shaking, the printing position of the front side can be adjusted based on the position of the corresponding photosensitive point collected by the photoelectric tracker 6. The specific adjustment method can be manual adjustment or based on the control system of the flexographic printing press. By adjusting the color mark mode, the control system can be matched with the photoelectric tracker 6, thereby enabling the control system to have a fully automatic overprinting function for front and back printing, ultimately achieving front and back overprinting so that the front and back patterns correspond. In addition, the position of the flipping frame can also be adjusted according to the color sequence of different products, so as to be applicable to more products with front and back printing processes. After testing, the flexographic printing press based on the front and back printing flipping mechanism showed that the front and back printing error was less than 0.1mm, the scrap rate was significantly reduced, and the quality of finished products was greatly improved.

[0041] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A label front-back chase printing flip mechanism for a flexographic printing machine, characterized in that: it comprises a flip unit and a front-back chase assembly; the flip unit comprises a base (1) and a flip frame mounted on the base (1); the flip frame comprises a first support plate (2), a second support plate (3), a first paper guide roller (4) and a flip assembly; the first support plate (2) and the second support plate (3) are arranged in parallel and are respectively mounted vertically on the base (1); the first paper guide roller (4) is located between the first support plate (2) and the second support plate (3), and its two ends are respectively connected to the first support plate (2) and the second support plate (3) near one end of the base (1), and a gap is left between the roller surface of the first paper guide roller (4) and the base (1); the flip assembly is mounted between the first support plate (2) and the second support plate (3) and is used for flipping a to-be-printed film product; the front-back chase assembly comprises a support seat (5) and a photoelectric tracker (6); the support seat (5) is mounted on the base (1); the photoelectric tracker (6) is mounted on the support seat (5) and its light-emitting surface is close to the roller surface of the first paper guide roller (4), and is used for collecting a photosensitive point on the to-be-printed film product passing through the first paper guide roller (4); the angle between the optical axis of the light emitted by the photoelectric tracker (6) and the central axis of the first paper guide roller (4) is 60°-120°.

2. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 1, characterized in that: the angle between the optical axis of the light emitted by the photoelectric tracker (6) and the central axis of the first paper guide roller (4) is 90°; the light-emitting surface of the photoelectric tracker (6) is parallel to the central axis of the first paper guide roller (4), and the distance D between them is R+(5-15) mm, wherein R is the radius of the first paper guide roller (4).

3. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 2, characterized in that: the distance D between the light-emitting surface of the photoelectric tracker (6) and the central axis of the first paper guide roller (4) is R+10 mm.

4. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 1 or 2 or 3, characterized in that: it further comprises a display unit, which is electrically connected to the photoelectric tracker (6).

5. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 1, characterized in that:

6. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 5, characterized in that: the support seat (5) is slidingly connected to the base (1), and the sliding direction is consistent with the axial direction of the first paper guide roller (4).

7. The label front-back chase printing flip mechanism for a flexographic printing machine according to claim 1, characterized in that: the flip assembly comprises a first flip roller (7), a second flip roller (8), a second paper guide roller (9) and a third paper guide roller (10). ​ ​ ​ ​ ​ ​ ​ The photoelectric tracker (6) has a detection distance of 200-2000mm, a detection response time of ≤0.5ms, and a residual ripple of <5V SS , a light spot of φ1mm-φ1.5mm, a working voltage of 10-30VDC, and an induction distance of 0-7m. ​ ​ ​ ​ The first and second turnover rollers (7, 8) are located between the first and second support plates (2, 3), are perpendicular to each other, and have a radial gap between the roller surfaces; the two ends of the first turnover roller (7) are connected to the lower end of the first support plate (2) and the upper end of the second support plate (3) respectively, and the two ends of the second turnover roller (8) are connected to the upper end of the first support plate (2) and the lower end of the second support plate (3) respectively; The second paper guide roller (9) has two, which are installed on the outer sides of the first and second support plates (2, 3) and are perpendicular to the central axis of the first paper guide roller (4); The two ends of the third paper guide roller (10) are connected to the ends of the first and second support plates (2, 3) away from the base (1) and are parallel to the central axis of the first paper guide roller (4).

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