Label quality detection device and plate-free printing machine

Abstract

The utility model relates to the technical field of label production and manufacturing, and discloses a label quality detection device and a plate-free printing machine, the label quality detection device comprises a detection platform and a conveyor belt circularly and rotatably connected to the detection platform, an imaging assembly is arranged above the conveyor belt, and a shading frame located above the conveyor belt is fixedly connected to the detection platform; passing gaps allowing labels to pass through are formed between the two side faces, in the conveying direction of the conveying belt, of the shading frame and the conveying belt, and the imaging assembly is vertically connected into the shading frame in a sliding mode; two limiting parts are slidably connected to the bottom of the shading frame in the direction perpendicular to the conveying direction of the conveying belt, a limiting space for limiting a label is defined between the two limiting parts, each limiting part is connected with a shading part which protrudes out of the shading frame and plays a role in shading passing through the gap, and the shading parts connected to the two limiting parts are partially overlapped. The automatic label detection device solves the problem that automatic label detection equipment in the prior art cannot accurately detect labels with different widths.

Description

Technical Field

[0001] The utility model relates to the technical field of label production and manufacturing, in particular to a label quality detection device and a plateless printing machine. Background Art

[0002] Currently, labels on the market are primarily categorized as physical labels, network labels, and electronic labels. Physical labels are printed by a printer and affixed to a product or other carrier to identify the product. Existing physical labels can be prone to defects such as offset printing, missing prints, overprinting, scratches, and stains when printed on a printer due to factors such as the surrounding environment, the printing process, and the operating status of the printing equipment. To minimize defects in label products, quality testing is required during the production process.

[0003] Label quality inspection is primarily divided into manual inspection and automated inspection. Due to rising labor costs and the potential for missed and false positives during manual inspection, more and more manufacturers are adopting automated inspection methods. Existing automated inspection equipment typically includes an inspection platform equipped with an imaging component equipped with an image acquisition function. Labels are sequentially conveyed through the imaging component on a conveyor belt, which automatically captures the images. The captured images are then processed and identified using existing recognition technologies to automatically determine if any label quality issues exist.

[0004] In order to enable the imaging component to clearly and accurately capture the label, according to the imaging process of the imaging component, a light shielding frame needs to be set outside the imaging component to block light, so as to reduce the interference of external light on the shooting process. Although the imaging component in the prior art can complete the shooting and imaging, the following problems still exist in actual application:

[0005] 1. There are many types of physical labels in the existing technology, and the widths of different types of labels vary. If existing imaging components are used to capture labels of different widths, when the label width changes, the label may become skewed or wrinkled during transmission, affecting the accurate imaging of the label.

[0006] 2. The existing light-shielding frame has a fixed size, and a passing gap is set between the light-shielding frame and the conveyor belt for the label to pass through. When the width of the label is large and close to the width of the light-shielding frame, the label itself can produce a good sealing and shielding effect on the passing gap, thereby reducing the external light from entering the light-shielding frame and affecting the imaging quality. However, when the width of the label is reduced and is smaller than the passing gap, the label cannot completely block the passing gap. At this time, external light can enter the light-shielding frame through the passing gap that is not blocked by the label, affecting the accuracy of imaging. Utility Model Content

[0007] The utility model aims to provide a label quality detection device and a plateless printing press, so as to solve the problem that the automatic label detection equipment in the prior art cannot accurately detect labels with different widths.

[0008] In order to solve the above problems, the present invention adopts the following technical solutions: a label quality detection device, comprising a detection platform and a conveyor belt rotatably connected to the detection platform, an imaging assembly is provided above the conveyor belt, a light-shielding frame located above the conveyor belt is fixedly connected to the detection platform, a passing gap for the label to pass through is provided between the two side surfaces of the light-shielding frame and the conveyor belt along the conveying direction of the conveyor belt, and the imaging assembly is vertically slidably connected to the light-shielding frame; two limiting parts are slidably connected to the bottom of the light-shielding frame along a direction perpendicular to the conveying direction of the conveyor belt, a limiting space for limiting the label is formed between the two limiting parts, and each limiting part is connected to a light-shielding part that protrudes from the light-shielding frame and serves to shield the passing gap, and the light-shielding parts connected to the two limiting parts partially overlap.

[0009] The principle and beneficial effects of this solution are as follows: the conveyor belt is used to convey the label to the bottom of the imaging assembly so that the imaging assembly can photograph the label, and then use the judgment method in the prior art to determine whether the label has defects, and the imaging assembly in this application is vertically slidably connected to the light shielding frame, so that the imaging assembly can photograph labels of different widths. The light shielding frame is used to block external light, and a gap is provided between the light shielding frame and the conveyor belt to ensure that the label can be continuously and stably conveyed to the bottom of the imaging assembly, so that the imaging assembly can better complete the photographing and imaging of the label. Of course, in order to ensure the smooth shooting of the imaging assembly, a light source can be installed in the light shielding frame, which will not be repeated here.

[0010] In this application, a limiting part is connected to the bottom of the light-shielding frame by sliding along a direction perpendicular to the conveying direction of the conveyor belt, and a limiting space for the limiting label is formed between the two limiting parts. When the two limiting parts are slid, the width of the limiting space formed between the two limiting parts can be adjusted, so that the two limiting parts can limit labels of different widths, ensuring that labels of different widths can be smoothly and accurately transmitted to the bottom of the imaging component, reducing problems such as deflection and wrinkles in transmission after the label width changes, and effectively improving the accuracy of label detection.

[0011] In addition, in the present application, each limiting portion is connected to a light shielding portion protruding from the light shielding frame. The light shielding portion can be used to shield the passing gap, and the light shielding portions connected to the two limiting portions partially overlap, so that when the two limiting portions slide relative to each other and move away from each other, it can also be ensured that the light shielding portions connected to the two limiting portions always have a light shielding effect on the passing gap, except that the overlapping size between the light shielding portions is reduced. Therefore, by adopting the solution in the present application, when performing quality inspection on labels of different widths, the light shielding portion can shield the space other than the label in the passing gap, effectively reducing the interference of external light on the imaging detection of the imaging component, and effectively improving the stability and accuracy of the detection.

[0012] In addition, the shading part in the present application is connected to the limiting part. Therefore, when the distance between the two limiting parts is adjusted to detect labels of different widths, the shading part will move synchronously with the limiting part, thereby automatically adjusting the overlapping size between the shading parts and automatically adjusting the shading position of the gap. The entire structure is simple and easy to adjust, and can complete the label detection work more accurately and efficiently.

[0013] Preferably, as an improvement, the light-shielding frame is provided with a driving mechanism for driving the limiting portion to slide relative to the light-shielding frame.

[0014] In this solution, a driving mechanism is provided to drive the movement of the limiting portion, so that the adjustment of the limiting portion is smoother and more accurate, and the adjustment process can be completed automatically.

[0015] Preferably, as an improvement, the driving mechanism includes a bidirectional screw, which is rotatably connected to the top of the light-shielding frame, wherein one limiting portion is threadedly engaged with a thread of one rotation direction of the bidirectional screw, and the other limiting portion is threadedly engaged with a thread of the other rotation direction of the bidirectional screw.

[0016] In this solution, a bidirectional screw is used as a driving mechanism, and the two ends of the bidirectional screw have threads with opposite rotation directions. When the bidirectional screw is rotated, the two limiting parts can be driven to move closer to or away from each other at the same time, and the adjustment structure is simple and efficient; at the same time, since the two limiting parts move synchronously, the midpoint position of the line connecting the two limiting parts will not change when the two limiting parts move closer to or away from each other, so that when the two limiting parts are used to form a limiting space to limit the label, even if the width of the label changes, it can be ensured that the midpoint position of the label remains unchanged after the label is limited, so that when the imaging component only slides vertically and does not move horizontally, it can also successfully complete the accurate shooting of labels of different widths.

[0017] Preferably, as an improvement, the top of the light-shielding frame is fixedly connected to a slide rail, and the two limiting parts are slidably connected to the slide rail.

[0018] In this solution, the sliding rail is provided to provide limitation and guidance for the sliding of the limiting part, so that the sliding of the limiting part is smoother and more stable.

[0019] Preferably, as an improvement, the light-shielding frame is provided with sliding grooves at the bottom of both sides along the conveying direction of the conveyor belt, and the light-shielding portion is slidably engaged with the sliding grooves.

[0020] In this solution, a sliding groove is provided on the light-shielding frame, and the sliding groove is used to provide a limit for the movement of the light-shielding part following the limit part, which not only makes the movement of the light-shielding part more stable and precise; at the same time, the upper edge of the light-shielding part contacts the bottom wall of the sliding groove. Therefore, during the movement of the light-shielding part, even if the light-shielding part moves relatively and the overlapping length between the light-shielding parts changes and a gap appears, the outside light still cannot enter the light-shielding frame due to the shielding effect of the bottom wall of the sliding groove on the light-shielding part, so that better imaging conditions are obtained in the light-shielding frame, and the imaging quality is effectively improved.

[0021] Preferably, as an improvement, a pressing roller is rotatably connected to one side of the limiting portion facing the inside of the light-shielding frame, and a conveying gap for conveying labels is provided between the pressing roller and the conveyor belt.

[0022] In this solution, by rotating the connected pressing roller on the limiting part toward one side inside the light-shielding frame, when the label follows the conveyor belt through the light-shielding frame position, the two limiting parts can provide limitation for the label, and the pressing roller can assist in pressing the edge of the label, thereby making the label flatter during the imaging process and further improving the accuracy of label detection.

[0023] Preferably, as an improvement, the number of pressing rollers on the limiting portion is at least two, and all pressing rollers are divided into two groups, and the two groups of pressing rollers are located on both sides of the imaging space of the imaging assembly.

[0024] In this solution, multiple pressing rollers are set up to improve the effect of auxiliary pressing and flattening of the label, and all pressing rollers are divided into two groups. The imaging range of the imaging component is located between the two groups of pressing rollers, so that when the label is photographed and imaged, both sides of the imaging range are pressed by the pressing rollers, further improving the flatness and stability of the label during the imaging process, and effectively improving the accuracy of detection.

[0025] Preferably, as an improvement, the limiting portion is a limiting seat, and a guiding slope is provided on the limiting seat at one end that contacts the label first.

[0026] In this solution, a guiding slope is provided on the limit seat to guide the label into the limit space between the two limit seats, so that the label can enter the bottom of the light shielding frame more smoothly and accurately, thereby completing the detection more accurately.

[0027] Preferably, as an improvement, the two side surfaces of the light-shielding frame along the conveying direction of the conveyor belt are rotatably connected to the top surface of the light-shielding frame.

[0028] In this solution, the two side surfaces of the light shielding frame located in the conveying direction of the conveyor belt are set to a rotatable state, so that the operation is more convenient when adjusting the imaging component or placing the head end of the label between the conveyor belt and the pressing roller.

[0029] A plateless printing press comprises the label quality detection device.

[0030] In this solution, by setting the aforementioned label quality detection device on the plateless printing press, the accuracy of the plateless printing press in label detection can be effectively improved, the number of defective products in the label production process can be reduced, and the product yield can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a front cross-sectional view of the first embodiment of the present invention.

[0032] Figure 2 for Figure 1 Cross-sectional view along AA.

[0033] Figure 3 This is a partial cross-sectional view of the cooperation between the sunshade plate and the front side plate in the first embodiment of the present invention.

[0034] Figure 4 This is a front cross-sectional view of the second embodiment of the present utility model DETAILED DESCRIPTION

[0035] The following is further described in detail through specific implementation methods:

[0036] The reference numerals in the drawings of the specification include: detection platform 1, conveyor belt 2, shading frame 3, front side plate 301, rear side plate 302, imaging assembly 4, limit seat 5, bidirectional screw 6, slide rail 7, shading plate 8, pressing roller 9.

[0037] Example 1

[0038] This embodiment is as shown in the attached Figure 1 As shown: A label quality inspection device includes a detection platform 1 and a conveyor belt 2 connected to the detection platform 1 in a circular rotation. The conveyor belt 2 can be driven by a motor and a rotating roller in the prior art so that the labels can be continuously transported during the rotation of the conveyor belt 2. Figure 2The inspection platform 1 is fixed with a light-shielding frame 3 by screws, and the bottom opening of the light-shielding frame 3 is set. A passing gap for the label to pass is set between the two side surfaces of the light-shielding frame 3 along the conveying direction of the conveyor belt 2 and the conveyor belt 2. For the convenience of distinction, the above-mentioned two side surfaces are respectively the front side panel 301 and the rear side panel 302 along the conveying direction of the conveyor belt 2. The top surface of the front side panel 301 and the top surface of the rear side panel 302 are both rotatably connected to the top panel of the light-shielding frame 3 by hinges, and the rotation direction of the front side panel 301 and the rear side panel 302 are both rotated toward the inside of the light-shielding frame 3, so that the front side panel 301 and the rear side panel 302 can be rotated open, and when not subjected to external force, under the action of the front side panel 301 and the rear side panel 302 themselves, it can ensure that the entire light-shielding frame 3 has a good light-shielding effect.

[0039] Combine Figure 1 and Figure 2 , an imaging component 4 is vertically slidably connected to the light shielding frame 3. The imaging component 4 can be used to photograph and image the label, and then the image processing technology and image recognition technology in the existing technology are used to process and judge the imaging results of the label, thereby automatically completing the label quality inspection. Since the use of imaging technology to photograph and shape the label and judge whether the label has defects is a conventional technical means, for example, the imaging component 4 mainly includes a high-definition camera, and a light source structure is installed in the light shielding frame 3, etc., which will not be described in detail here. It should be noted that for the vertical sliding form of the imaging component 4 in the light shielding frame 3, the imaging component 4 can be driven to slide vertically by an electric cylinder, or the height of the imaging component 4 can be adjusted by using a guide groove combined with a screw fixation method, which will not be described in detail here.

[0040] like Figure 2 As shown, the bottom of the light shielding frame 3 is slidably connected to two stoppers perpendicular to the conveying direction of the conveyor belt 2. The two stoppers define a space between the two stoppers for retaining the label. Specifically, the stoppers are stoppers 5, which have a guide slope on one side of the front side plate 301. The two guide slopes of the stoppers 5 form a tapered guide structure, allowing the front end of the label to enter the space more smoothly and accurately.

[0041] like Figure 2 As shown, in this embodiment, a driving mechanism for driving the limiting seat 5 to slide relative to the light shielding frame 3 is provided on the light shielding frame 3, and the driving mechanism includes a bidirectional screw 6 rotatably connected to the top of the light shielding frame 3 through a bearing, and both ends of the bidirectional screw 6 are provided with external threads with opposite rotation directions, one limiting seat 5 is threadedly engaged with the external thread at one end of the bidirectional screw 6, and the other limiting seat 5 is threadedly engaged with the external thread at the other end of the bidirectional screw; at the same time, a driving motor is fixedly connected to the light shielding frame 3, a driving wheel is fixedly connected to the driving motor, and a driven wheel is fixedly connected to the bidirectional screw 6 through a flat key, and the driven wheel is meshed with the driving wheel ( Figure 1 and Figure 2 The driving motor, the driving wheel and the driven wheel structure are not shown in the figure); in addition, in order to make the limit seat 5 slide more smoothly and accurately, in this embodiment, a slide rail 7 is fixedly connected to the top of the light-shielding frame 3 by screws, and the two limit seats 5 are slidably matched with the slide rail 7.

[0042] Combine Figure 1 and Figure 2 Each limit seat 5 is fixedly connected with a shading portion that protrudes outside the shading frame 3 and plays a shading role for the gap. The shading portion is a shading plate 8 fixedly connected to the limit seat 5 by screws. Figure 3 The two light shielding plates 8 on the two limiting seats 5 on the same side of the light shielding frame 3 have a certain length of overlap, and the length of the overlap is greater than the limit value of the relative sliding distance of the two limiting seats 5. At the same time, in this embodiment, to ensure that the light shielding plates 8 slide more smoothly and accurately, sliding grooves are formed at the bottom of the front side plate 301 and the bottom of the rear side plate 302. The light shielding plates 8 slide in the sliding grooves, and the top of the light shielding plates 8 contacts the bottom wall of the sliding grooves. Therefore, when the two light shielding plates 8 on the same side of the light shielding frame 3 slide relative to each other, even if a gap is generated between the light shielding plates 8 due to sliding, the bottom wall of the sliding groove can still block the gap, thereby preventing external light from entering the light shielding frame 3 during the detection process and interfering with the imaging of the label.

[0043] In this embodiment, when it is necessary to test the printing quality of the label, first rotate and open the front side panel 301, and then place the head end of the label between the two limit seats 5 along the conveying direction of the conveyor belt 2. The guide slope provided on the limit seat 5 can guide the label, so that the label can accurately enter the limit space formed by the two limit seats 5, and the width of the limit space is equal to the width of the label, so that the limit seat 5 can accurately guide the transmission of the label, and then close the front side panel 301.

[0044] When the label is accurately placed on the conveyor belt 2 and accurately located between the two limit seats 5, the conveyor belt 2 can be driven to continuously convey the label to the bottom of the imaging component 4, and the imaging component 4 is used to photograph the label. Then, the photographed image is automatically processed and analyzed using existing technology to determine whether the label has defects, etc. The photographed label is conveyed out of the light-shielding frame 3 along the conveyor belt 2, and the qualified labels can be collected uniformly.

[0045] In this embodiment, when it is necessary to perform quality inspection on labels of different widths, the distance between the two limit seats 5 can be adjusted so that the limit space formed between the two limit seats 5 is adjusted to be equal to the width of the label, so that the label can be well limited. Specifically, taking the increase of the limit space as an example, the bidirectional screw 6 is driven by a driving motor to rotate, and the bidirectional screw 6 drives the two limit seats 5 to move simultaneously and away from each other, so that the width of the limit space is increased. Since the two limit seats 5 move at the same time, even after the width of the limit space is increased, the middle position of the limit space is still located directly below the imaging component 4. Therefore, when the label with the changed width is conveyed to the bottom of the imaging component 4, the middle position of the label is also located below the imaging component 4. At this time, it is only necessary to adjust the imaging component 4 up and down to clearly and completely complete the label imaging operation.

[0046] A plateless printing machine, comprising the above-mentioned label quality detection device, can more accurately perform quality detection on labels of different widths.

[0047] Example 2

[0048] The difference between the second embodiment and the first embodiment is that: Figure 4 As shown, in this embodiment, a pressing roller 9 is rotatably connected to the side of the limiting seat 5 facing the inside of the light shielding frame 3 through a pin shaft. A transmission gap for label transmission is provided between the pressing roller 9 and the conveyor belt 2, and there are multiple pressing rollers 9 on each limiting seat 5, and the multiple pressing rollers 9 are divided into two groups. Figure 4 There are four pressing rollers 9 on each limiting seat 5, and the four pressing rollers 9 are divided into two groups. The imaging space of the imaging assembly 4 is located between the two groups of pressing rollers 9. In this embodiment, the pressing rollers 9 are used to assist in pressing the label, so that the label is more flat when it is photographed under the imaging assembly 4, effectively improving the imaging quality and thus improving the accuracy of label quality detection.

[0049] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A label quality inspection device comprising an inspection platform and a conveyor belt rotatably connected to the inspection platform, an imaging assembly disposed above the conveyor belt, a light shielding frame fixedly connected to the inspection platform and located above the conveyor belt, and a clearance gap for labels to pass between the light shielding frame and the conveyor belt on two side surfaces along the conveying direction of the conveyor belt, characterized in that: The imaging component is vertically slidably connected in the light-shielding frame; the bottom of the light-shielding frame is slidably connected to two limiting parts along a direction perpendicular to the conveying direction of the conveyor belt, and a limiting space of a limiting label is formed between the two limiting parts, and each limiting part is connected to a light-shielding part that protrudes out of the light-shielding frame and serves to shield light passing through the gap, and the light-shielding parts connected to the two limiting parts partially overlap.

2. The label quality detection device according to claim 1, characterized in that: The light-shielding frame is provided with a driving mechanism for driving the limiting portion to slide relative to the light-shielding frame.

3. The label quality detection device according to claim 2, characterized in that: The driving mechanism includes a bidirectional screw, which is rotatably connected to the top of the light-shielding frame. One of the limiting parts is threadedly engaged with the thread of one rotation direction of the bidirectional screw, and the other limiting part is threadedly engaged with the thread of the other rotation direction of the bidirectional screw.

4. The label quality detection device according to claim 2, characterized in that: The top of the light-shielding frame is fixedly connected with a slide rail, and the two limiting parts are slidably connected to the slide rail.

5. The label quality detection device according to claim 2, characterized in that: The bottom of two side surfaces of the light-shielding frame along the conveying direction of the conveyor belt are provided with sliding grooves, and the light-shielding portion is slidably matched with the sliding grooves.

6. The label quality detection device according to claim 1, characterized in that: A pressing roller is rotatably connected to one side of the limiting portion facing the inside of the light shielding frame, and a transmission gap for transmitting labels is provided between the pressing roller and the conveyor belt.

7. The label quality detection device according to claim 6, characterized in that: The number of the pressing rollers on the limiting portion is at least two, and all the pressing rollers are divided into two groups. The two groups of pressing rollers are located on both sides of the imaging space of the imaging component.

8. The label quality detection device according to claim 1, characterized in that: The limiting portion is a limiting seat, and a guiding inclined surface is provided on the limiting seat at one end that contacts the label first.

9. The label quality detection device according to claim 1, characterized in that: The two side surfaces of the light-shielding frame along the conveying direction of the conveyor belt are rotatably connected to the top surface of the light-shielding frame.

10. A plateless printing press, characterized in that: It comprises a label quality detection device as described in any one of claims 1-9.

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