Diffuse reflection type code spraying device

Abstract

The utility model discloses a diffuse reflection type code spraying device, and belongs to the technical field of code spraying machines. The code spraying device comprises a conveying belt for conveying objects to be subjected to code spraying, wherein a nozzle is arranged above the conveying belt; a receiving part is arranged at the tail end of the conveying belt, and a first diffuse reflection electric eye is arranged on a moving path where an object to be subjected to code spraying is transferred from the conveying belt to the receiving part; the distance between the first diffuse reflection electric eye and the nozzle is smaller than the length of an object to be subjected to code spraying in the conveying direction, and no shielding object exists in a detection area of the first diffuse reflection electric eye. According to the utility model, the first diffuse reflection electric eye is arranged at the tail end of the conveying belt, and no shielding object exists in the detection area of the first diffuse reflection electric eye, so that the interference of the conveying belt and other environmental colors on the detection precision of the first diffuse reflection electric eye can be effectively avoided; the phenomenon of missing code spraying or repeated code spraying caused by small color difference is fundamentally solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of inkjet printer, more specifically, relate to a diffuse reflection type inkjet printer. BACKGROUND

[0002] The inkjet printer is a non-contact inkjet marking system controlled by a single-chip microcomputer, which can print production date, batch number, bar code, trademark pattern, anti-counterfeit mark and Chinese characters on various object surfaces, and is widely used in food industry, cosmetics industry, pharmaceutical industry, automobile parts processing industry.

[0003] The inkjet printer mainly consists of a control system, a detection component, a code execution component, an ink supply system and the like. The detection component is used to detect the workpiece to be inked entering the inkjet area and then transmit the detection signal to the control system. After receiving the signal that the workpiece enters the inkjet area, the control system controls the ink supply system to deliver ink to the inkjet execution component, and the inkjet execution component accurately sprays ink onto the workpiece surface, thereby forming clear and complete inkjet marks.

[0004] The detection component is commonly known as an electric eye, which is usually divided into photoelectric induction type electric eye and diffuse reflection electric eye. The photoelectric induction type electric eye generally includes a transmitting end and a receiving end arranged oppositely, which mainly uses photoelectric effect to detect the presence or absence of an object, i.e. when an object passes through the light beam, the light beam is blocked, resulting in that the receiving end cannot receive the light signal, and thus it is judged whether there is an object passing through. The advantage of this type of electric eye is that the detection accuracy is high and it is not easy to be disturbed by environmental color difference. However, for some objects without obvious height, such as packaging bags, film products, etc., diffuse reflection electric eye is needed. The diffuse reflection electric eye judges whether there is a workpiece passing through by emitting light to the workpiece surface and then receiving the reflected light. However, the biggest problem of the diffuse reflection electric eye is that the sensing accuracy of the object is easily disturbed by the color of the environment, thus easily causing the phenomenon of missing ink or repeated ink.

[0005] Some methods to avoid missing ink or repeated ink are also provided in the prior art, for example, in the patent CN208324584U, photoelectric switch transmitters and photoelectric switch receivers are arranged on both sides of the synchronous belt, which can accurately identify and realize precise inkjet when the continuous bags and the gap between two adjacent packaging bottles are small. However, this scheme essentially belongs to the photoelectric induction type electric eye and is not suitable for inkjet operation of thin objects such as packaging bags and film products.

[0006] For example, in the patent CN213083697U, a color sensor is added to scan the material after code spraying to determine whether the code spraying is successful, and the detection information is collected by the controller. Although this method can effectively determine whether the code spraying is successful, it cannot solve the problem of missing or re-spraying codes. At the same time, the additional color sensor undoubtedly increases the cost of the equipment. Therefore, it is of great practical significance to design a diffuse reflection type code spraying device that can effectively reduce color difference interference. Content of the utility model

[0007] 1. Problem to be solved

[0008] In view of the problem that the diffuse reflection type code spraying machine is easily disturbed by color difference in the prior art, resulting in poor code spraying accuracy, the utility model provides a diffuse reflection type code spraying device to ensure that there is no other obstruction in the detection range of the diffuse reflection electric eye, thereby minimizing the interference of environmental color difference and ensuring the accuracy of code spraying.

[0009] 2. Technical scheme

[0010] To solve the above problems, the utility model adopts the following technical scheme:

[0011] The utility model discloses a diffuse reflection type code spraying device which comprises a conveying belt for conveying articles to be sprayed with codes, and a nozzle is arranged above the conveying belt.

[0012] The end of the conveying belt is provided with a receiving part, and a first diffuse reflection electric eye is arranged on the moving path of the article to be sprayed with codes when it is transferred from the conveying belt to the receiving part.

[0013] The distance between the first diffuse reflection electric eye and the nozzle is less than the length of the article to be sprayed with codes in the conveying direction, and there is no obstruction in the detection area of the first diffuse reflection electric eye.

[0014] In some embodiments, the first diffuse reflection electric eye is located in the gap between the conveying belt and the receiving part.

[0015] In some embodiments, the first diffuse reflection electric eye is located in the avoidance groove on the receiving part, and the first diffuse reflection electric eye is arranged upward and does not exceed the upper surface of the receiving part.

[0016] In some embodiments, the receiving part is a fixed support plate or a conveying belt.

[0017] In some embodiments, the height of the receiving part is not higher than the height of the conveying belt, and the height difference between them is controlled within 18±4mm.

[0018] In some embodiments, an infrared emitter is further included for forming a positioning mark line on the conveying belt.

[0019] In some embodiments, the nozzle is located directly above the extension line of the positioning mark line.

[0020] In some embodiments, a second diffuse reflection electric eye is provided on the side of the first diffuse reflection electric eye away from the nozzle, and the detection area of the second diffuse reflection electric eye is free of any obstruction; when the second diffuse reflection electric eye detects that an article passes, the conveying belt is controlled to stop conveying.

[0021] In some embodiments, the distance between the second diffuse reflection electric eye and the first diffuse reflection electric eye is controlled to be 5-20 cm.

[0022] The utility model discloses a diffuse reflection type code spraying device, which comprises a conveying belt for conveying articles to be sprayed with codes, and a nozzle arranged above the conveying belt.

[0023] The utility model further comprises a first diffuse reflection electric eye with a detection area free of any obstruction; wherein,

[0024] The first diffuse reflection electric eye is arranged close to the end of the conveying belt, and a certain gap is provided between the first diffuse reflection electric eye and the nozzle; the longitudinal distance between the first diffuse reflection electric eye and the nozzle is less than the length of the article to be sprayed with codes, and the transverse distance between the first diffuse reflection electric eye and the nozzle is less than the width of the article to be sprayed with codes.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the utility model has the beneficial effects that:

[0027] (1) The utility model discloses a diffuse reflection type code spraying device, which is different from the conventional method of directly arranging a first diffuse reflection electric eye above a conveying belt, so that the first diffuse reflection electric eye is not easily disturbed by the color of the conveying belt. In the utility model, the first diffuse reflection electric eye is arranged at the end of the conveying belt, and a certain gap is provided between the first diffuse reflection electric eye and the nozzle, and the detection area of the first diffuse reflection electric eye is free of any obstruction, so that the interference of the conveying belt and other environmental colors on the detection accuracy of the first diffuse reflection electric eye can be effectively avoided; only when the article to be sprayed with codes passes through the detection area of the first diffuse reflection electric eye, the nozzle is started, so that the accuracy of code spraying is greatly ensured, and the phenomenon of missing code spraying or repeated code spraying caused by small color difference is solved from the root.

[0028] (2) The diffused reflection type code spraying device, a positioning mark line is formed on the conveying belt by the infrared emitter, the positioning mark line can be used as a reference of the placement position of the code spraying object, on one hand, the code spraying object can be effectively prevented from deviating from the nozzle or the first diffused reflection electric eye, and the normal code spraying is affected, on the other hand, the relative positions between different code spraying objects and the nozzle are relatively uniform, and therefore, the consistency of the code spraying position is beneficial to be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic view of the diffused reflection type code spraying device of the utility model;

[0030] Figure 2 It is Figure 1 It is an enlarged schematic view of A in the figure;

[0031] Figure 3 It is a structure schematic view of the bearing part in the utility model.

[0032] In the figure: 100, conveying belt; 200, nozzle; 300, bearing part; 310, avoiding groove;

[0033] 400, first diffused reflection electric eye; 500, second diffused reflection electric eye; 600, infrared emitter; 610, positioning mark line. DETAILED DESCRIPTION

[0034] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings.

[0035] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] As introduced in the background art, the diffused reflection type code spraying machine is easy to be disturbed by the environment color, and thus the phenomenon of missing code spraying or repeated code spraying is easy to occur. In the actual working scene, the surrounding environment color is complex and changeable, when the environment color is similar to the workpiece color or has similar optical reflection characteristics, the reflected light signal received by the diffused reflection electric eye will be confused, and it is difficult to accurately judge the position and state of the workpiece. This condition is easy to cause the phenomenon of missing code spraying or repeated code spraying, seriously affects the accuracy and stability of the code spraying operation, and reduces the production efficiency and product quality.

[0037] Typically, workpieces to be inspected are conveyed to the coding area by a conveyor belt. The conveyor belt is mostly dark in color, which undoubtedly increases the difficulty for diffuse reflection photoelectric sensors to distinguish items. Generally, by adjusting the trigger threshold of the diffuse reflection photoelectric sensor, or by using a high-precision sensor, accurate detection results can be achieved. However, when some items are similar in color to the conveyor belt, the light emitted by the diffuse reflection photoelectric sensor, after reflection from both the item and the conveyor belt surface, shows very little difference in intensity, spectrum, and other characteristics. This makes it difficult for the photoelectric sensor to clearly distinguish whether the signal originates from the item or the conveyor belt. Furthermore, for some transparent items, they almost appear the same color as the conveyor belt. In this case, due to the lack of necessary color difference between the item and the conveyor belt, the diffuse reflection photoelectric sensor struggles to capture effective differences in reflected light, further exacerbating the difficulty of differentiation and significantly reducing the accuracy of the detection results. This increases the risk of missed or duplicate coding during the coding process. Therefore, this invention aims to provide a method that can effectively reduce or even avoid the interference of ambient color on diffuse reflection photoelectric sensors, ensuring the accuracy of detection results and reducing the risk of missed or duplicate coding.

[0038] The present invention will be further described below with reference to specific embodiments.

[0039] like Figure 1 As shown, this embodiment of a diffuse reflection inkjet printer includes a conveyor belt 100, a nozzle 200, and a first diffuse reflection photoelectric sensor 400. The conveyor belt 100 is used to transport the items to be printed. The nozzle 200 is mounted above the conveyor belt 100 and is used to print the items passing below it. The nozzle 200 must be connected to the main body of the inkjet printer. The structure and working principle of the inkjet printer are existing technologies and will not be described in detail here. The first diffuse reflection photoelectric sensor 400 is also shown.

[0040] The first diffuse reflection photoelectric sensor 400 is positioned near the end of the conveyor belt 100, with a certain gap between it and the end of the conveyor belt 100. Simultaneously, there are no obstructions within the detection area of ​​the first diffuse reflection photoelectric sensor 400. Furthermore, it must be ensured that the longitudinal distance between the first diffuse reflection photoelectric sensor 400 and the nozzle 200 is less than the length of the item to be printed, and the lateral distance between them is less than the width of the item to be printed. That is, at a certain moment or over a certain period, the detection area of ​​the first diffuse reflection photoelectric sensor 400 and the printing area of ​​the nozzle 200 can simultaneously cover different parts of the item to be printed.

[0041] It should be noted that the "longitudinal distance" and "length" mentioned above refer to the distance along the conveying direction of the conveyor belt 100, i.e., the X-direction; while the "lateral distance" and "width" refer to the distance in the direction perpendicular to the conveying direction of the conveyor belt 100, i.e., the Y-direction.

[0042] During operation, the front end of the item to be coded first leaves the conveyor belt 100. When the first diffuse reflection photoelectric sensor 400 detects the presence of the item, at least a portion of the item is located below the nozzle 200. The nozzle 200 then begins coding to complete the coding operation. Since there are no obstructions within the detection area of ​​the first diffuse reflection photoelectric sensor 400, interference from the conveyor belt 100 and other environmental colors on the detection accuracy of the first diffuse reflection photoelectric sensor 400 is effectively avoided. The nozzle 200 is only activated when the item to be coded passes through the detection area of ​​the first diffuse reflection photoelectric sensor 400, thus greatly ensuring the accuracy of the coding and fundamentally solving the problem of missed or repeated coding caused by small color differences.

[0043] Specifically, refer to Figure 2 , Figure 3 As shown, a receiving part 300 is provided at the end of the conveyor belt 100, and a certain gap is left between the two. The first diffuse reflection photoelectric sensor 400 is set on the moving path of the item to be printed from the conveyor belt 100 to the receiving part 300, and ensures that the item to be printed can be detected by the first diffuse reflection photoelectric sensor 400 before it completely leaves the nozzle 200 area.

[0044] In some embodiments, the first diffuse photocell 400 is located in the gap between the conveyor belt 100 and the receiving part 300, for example, it can be mounted on the frame of the conveyor belt 100 by a bracket. Of course, it can also be provided on the receiving part 300. Preferably, the receiving part 300 can be a conveyor belt to improve the transfer efficiency of the items to be printed.

[0045] In practical use, it was found that the presence of the first diffuse reflection photocell 400 leads to a larger gap between the conveyor belt 100 and the receiving part 300, affecting the smoothness of the transfer of the item to be coded from the conveyor belt 100 to the receiving part 300. For some thinner items, such as protective film, there is a certain adhesive force between them and the conveyor belt 100. If the gap between the conveyor belt 100 and the receiving part 300 is large, the protective film will fold down with the end of the conveyor belt 100, thus failing to be transferred smoothly to the receiving part 300.

[0046] To this end, in this embodiment, a relief groove 310 is formed on the receiving portion 300. The first diffuse reflection electric eye 400 is arranged upwardly in the relief groove 310 and does not exceed the upper surface of the receiving portion 300. At this time, the receiving portion 300 can adopt a fixedly arranged support plate. Since the gap between the receiving portion 300 and the first diffuse reflection electric eye 400 is not used to place the first diffuse reflection electric eye 400, at this time, the distance of the gap can be reduced as much as possible to ensure that the article to be ink-jetted can be smoothly transferred from the conveying belt 100 to the receiving portion 300, on the premise that the receiving portion 300 and the conveying belt 100 do not interfere with each other.

[0047] Of course, the upper surface of the receiving portion 300 should not exceed the upper surface of the conveying belt 100. Preferably, the height of the receiving portion 300 should be slightly lower than the height of the conveying belt 100 to ensure the smoothness of the transfer of the article to be ink-jetted. However, if the height difference between the two is too large, the article to be ink-jetted will be suspended during the transfer process, which will affect the detection result of the first diffuse reflection electric eye 400. Therefore, in this embodiment, the height difference between the two is controlled within 18±4 mm to take into account the smoothness of the transfer of the article and the detection accuracy of the first diffuse reflection electric eye 400.

[0048] Further, the side of the first diffuse reflection electric eye 400 away from the nozzle 200 is provided with a second diffuse reflection electric eye 500, and the detection area of the second diffuse reflection electric eye 500 is also free of any obstruction. When the second diffuse reflection electric eye 500 detects that an article passes through, the conveying belt 100 is controlled to stop conveying. This is to prevent the operator from being unable to timely transfer the ink-jetted article due to the too fast conveying speed, causing the article to accumulate and affecting the normal ink-jetting. The second diffuse reflection electric eye 500 can be arranged in the same way as the first diffuse reflection electric eye 400, and will not be described again.

[0049] Preferably, the first diffuse reflection electric eye 400 and the second diffuse reflection electric eye 500 are both arranged upwardly, i.e., when detecting, the article to be ink-jetted passes above the first diffuse reflection electric eye 400. At the same time, the distance between the first diffuse reflection electric eye 400 and the second diffuse reflection electric eye 500 is controlled within the range of 5-20 cm, preferably 8-12 cm. The distance is mainly set to leave a certain detection time for the first diffuse reflection electric eye 400 to ensure that the first diffuse reflection electric eye 400 enters the detection range of the second diffuse reflection electric eye 500 after the detection result of the first diffuse reflection electric eye 400 is stable. At the same time, the nozzle 200 will only ink-jet after the detection result of the first diffuse reflection electric eye 400 is stable. In this way, it can effectively prevent the second diffuse reflection electric eye 500 from detecting when the detection result of the first diffuse reflection electric eye 400 is not stable, and the conveying belt 100 will stop; thereafter, since the conveying belt 100 has stopped after the detection result of the first diffuse reflection electric eye 400 is stable, it will affect the normal ink-jetting operation of the nozzle 200.

[0050] The diffused reflection type ink-jet printing device of the embodiment is further provided with an infrared emitter 600 on the frame of the conveying belt 100. The infrared emitter 600 can form a positioning mark line 610 at the feeding end of the conveying belt 100. The positioning mark line 610 can be used as a reference for the placement position of the object to be ink-jet printed. On the one hand, it can effectively prevent the object to be ink-jet printed from deviating from the nozzle 200 or the first diffused reflection electric eye 400, thereby affecting the normal ink-jet printing; on the other hand, it can make the relative position between different objects to be ink-jet printed and the nozzle 200 more uniform, thereby being beneficial to ensuring the consistency of the ink-jet printing position. Preferably, the nozzle 200 is located directly above the extension line of the positioning mark line 610, thereby leaving a larger fault tolerance space for the object to be ink-jet printed.

[0051] Compared with the traditional method of directly arranging the first diffused reflection electric eye 400 above the conveying belt 100, the first diffused reflection electric eye 400 is easy to be disturbed by the color of the conveying belt 100 itself. In the embodiment, the first diffused reflection electric eye 400 is arranged at the end of the conveying belt 100, and a certain distance is left between the two, and it is ensured that there is no any shielding object in the detection area of the first diffused reflection electric eye 400, thereby effectively avoiding the disturbance of the conveying belt 100 and other environmental colors to the detection accuracy of the first diffused reflection electric eye 400. Only when the object to be ink-jet printed passes through the detection area of the first diffused reflection electric eye 400, the nozzle 200 will be started, thereby greatly ensuring the accuracy of the ink-jet printing, and fundamentally solving the phenomenon of missing ink-jet printing or repeated ink-jet printing caused by small color difference.

[0052] The above description of the present application and its embodiments is illustrative and not restrictive, and the embodiment shown in the drawings is only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above description, without departing from the creative purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should all belong to the protection scope of the present application.

Claims

1. A diffuse reflection type inkjet printer, comprising a conveyor belt (100) for conveying items to be inkjet printed, characterized in that: A nozzle (200) is provided above the conveyor belt (100); The conveyor belt (100) has a receiving part (300) at its end, and a first diffuse reflection photoelectric sensor (400) is provided on the moving path of the item to be coded from the conveyor belt (100) to the receiving part (300); wherein, The distance between the first diffuse reflection photoelectric sensor (400) and the nozzle (200) is less than the length of the item to be printed along the conveying direction, and there are no obstructions in the detection area of ​​the first diffuse reflection photoelectric sensor (400).

2. The diffuse reflection type inkjet printer according to claim 1, characterized in that: The first diffuse reflection photoelectric sensor (400) is located in the gap between the conveyor belt (100) and the receiving part (300).

3. The diffuse reflection type inkjet printer according to claim 1, characterized in that: The first diffuse reflection photoelectric sensor (400) is located in the clearance groove (310) on the receiving part (300); the first diffuse reflection photoelectric sensor (400) is arranged facing upward and does not extend beyond the upper surface of the receiving part (300).

4. A diffuse reflection type inkjet printer according to claim 2 or 3, characterized in that: The receiving part (300) is a fixed support plate or conveyor belt.

5. A diffuse reflection type inkjet printer according to claim 4, characterized in that: The height of the receiving part (300) is not higher than the height of the conveyor belt (100), and the height difference between the two is controlled within 18±4mm.

6. A diffuse reflection type inkjet printer according to any one of claims 1-3, characterized in that: It also includes an infrared emitter (600) for forming a positioning mark line (610) on the conveyor belt (100).

7. A diffuse reflection type inkjet printer according to claim 6, characterized in that: The nozzle (200) is located directly above the extension of the positioning mark line (610).

8. A diffuse reflection type inkjet printer according to any one of claims 1-3, characterized in that: A second diffuse reflection photoelectric sensor (500) is provided on the side of the first diffuse reflection photoelectric sensor (400) away from the nozzle (200). There are no obstructions in the detection area of ​​the second diffuse reflection photoelectric sensor (500). When the second diffuse reflection photoelectric sensor (500) detects that an item is passing through, the control conveyor belt (100) stops conveying.

9. A diffuse reflection type inkjet printer according to claim 8, characterized in that: The distance between the second diffuse reflection photoelectric sensor (500) and the first diffuse reflection photoelectric sensor (400) is controlled to be 5-20cm.

10. A diffuse reflection type inkjet printer, comprising a conveyor belt (100) for conveying items to be inkjet printed, and a nozzle (200) disposed above the conveyor belt (100); characterized in that: It also includes a first diffuse reflection photoelectric sensor (400) with no obstructions in the detection area; among which, The first diffuse reflection photoelectric sensor (400) is located near the end of the conveyor belt (100) and there is a certain gap between them; the longitudinal distance between the first diffuse reflection photoelectric sensor (400) and the nozzle (200) is less than the length of the item to be printed, and the lateral distance between the first diffuse reflection photoelectric sensor (400) and the nozzle (200) is less than the width of the item to be printed.

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