Fault detection device of UV ink-jet printer nozzle

Abstract

The utility model relates to a UV ink-jet printer nozzle fault detection device, which comprises a paper tape, an unwinding mechanism, a winding mechanism and a visual detection mechanism, patterns sprayed by the UV ink-jet printer nozzle are carried on the paper tape, and the unwinding mechanism and the winding mechanism are respectively used for unwinding and winding the paper tape. And the visual detection mechanism is used for photographing the paper tape and judging whether the nozzle of the UV ink-jet printer breaks down or not according to the photographed picture. According to the utility model, the to-be-detected UV ink-jet printer nozzle sprays the predetermined pattern on the paper tape, the visual detection mechanism obtains the picture of the paper tape with the pattern and judges whether the to-be-detected UV ink-jet printer nozzle breaks down or not according to the obtained picture, so that the detection of the UV ink-jet printer nozzle is simple and efficient; jet printing product scrapping caused by nozzle faults can be effectively eliminated, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of UV inkjet printing, in particular to a fault detection device for a UV inkjet printer nozzle. Background Art

[0002] UV inkjet printers are mainly composed of mechanical parts, motherboards, power supplies, etc. When printing, the computer converts the content to be printed into content that the printer can recognize through the driver. The motherboard drives a series of actions such as feeding, inkjetting, and curing of the mechanical parts based on these translated contents. In inkjet printers, the print head is the most core component, which determines two different inkjet technologies. At present, one is thermal foaming technology and the other is micro-piezoelectric technology. The thermal foaming nozzle is relatively simple in structure, and multiple small nozzles can be integrated on a nozzle plate. Due to the large number of nozzles, more content can be printed at one time, so the inkjet printer using thermal foaming technology will print faster. However, this type of nozzle must be heated when working, which will inevitably have a certain impact on the nozzle. The nozzle will be damaged if it works for a long time. If the nozzle failure cannot be detected and replaced in time, even if only one nozzle in the nozzle is abnormal, it will affect the quality of the entire printing and cause losses. At the same time, due to the inability to print continuously, production efficiency will be reduced. The current method of UV inkjet printer nozzle fault detection basically requires printing a test pattern, and then manually identifying whether the pattern is broken, so as to determine whether the corresponding nozzle is blocked. Manual detection has errors and low accuracy. Utility Model Content

[0003] Based on this, in view of the technical problem that the current UV inkjet printer nozzle fault detection is mainly carried out through manual detection, which has errors and low accuracy, it is necessary for the utility model to provide a UV inkjet printer nozzle fault detection device.

[0004] The utility model proposes a fault detection device for a UV inkjet printer nozzle, which comprises a paper tape, a reeling mechanism, a reeling mechanism and a visual detection mechanism. The paper tape carries a pattern sprayed by the UV inkjet printer nozzle. The reeling mechanism and the reeling mechanism are respectively used for reeling and reeling the paper tape. The visual detection mechanism is used for taking a picture of the paper tape and judging whether the UV inkjet printer nozzle has a fault according to the taken picture.

[0005] The utility model sprays a predetermined pattern on a paper tape by a UV inkjet printer nozzle to be detected, obtains a picture of the paper tape with the pattern by mature visual detection technology, and extracts pattern features based on the obtained picture, thereby judging whether the UV inkjet printer nozzle to be detected is faulty. The detection of the UV inkjet printer nozzle is simple and efficient, and can effectively eliminate the scrapping of printed products caused by nozzle failure, thereby improving production efficiency.

[0006] As a further improvement of the above scheme of the utility model, it also includes a workbench and a driving mechanism, the unwinding mechanism, the rewinding mechanism and the driving mechanism are all installed on the workbench, and the driving mechanism is used to drive the visual inspection mechanism to move horizontally and vertically on the paper tape.

[0007] As a further improvement of the above-mentioned scheme of the utility model, the driving mechanism includes a gantry, a transverse linear guide, a longitudinal linear guide, a transverse driving member and a longitudinal driving member; the gantry is installed on the workbench, the transverse linear guide is horizontally arranged and installed on the gantry, a transverse slider is slidably installed on the transverse linear guide, and the transverse driving member drives the transverse slider to move horizontally on the transverse linear guide; the longitudinal linear guide is vertically arranged and installed on the transverse slider, a longitudinal slider is slidably installed on the longitudinal linear guide, and the longitudinal driving member drives the longitudinal slider to move vertically on the longitudinal linear guide; the visual inspection mechanism is installed on the longitudinal slider.

[0008] As a further improvement of the above solution of the utility model, the transverse driving member adopts a rodless cylinder, and hydraulic limiters are provided at both ends of the transverse linear guide rail.

[0009] As a further improvement of the above scheme of the utility model, the longitudinal driving member includes a servo motor and a ball screw. The servo motor is installed at the top end of the longitudinal linear guide rail and its output shaft is transmission-connected to the ball screw. The ball screw runs through the longitudinal slider.

[0010] As a further improvement of the above solution of the utility model, a position sensor for detecting the moving distance of the longitudinal slider is installed at the top end of the longitudinal linear slide rail.

[0011] As a further improvement of the above solution of the utility model, the unwinding mechanism includes an unwinding roller shaft, and both ends of the unwinding roller shaft are rotatably connected to an unwinding connecting frame, and the unwinding connecting frame is installed on the workbench.

[0012] As a further improvement of the above-mentioned scheme of the utility model, the winding mechanism includes a winding roller shaft, a magnetic powder clutch, a bevel gear set, a transmission belt and a servo motor 2. The winding roller shaft is parallel to the unwinding roller shaft and both ends thereof are rotatably connected to a winding connecting frame, which is installed on a workbench. The power output shaft of the magnetic powder clutch is transmission-connected to one end of the winding roller shaft through the bevel gear set, and the power input shaft of the magnetic powder clutch is transmission-connected to the output shaft of the servo motor 2 through the transmission belt, and the servo motor 2 is installed on the workbench.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model sprays a predetermined pattern on a paper tape by a UV inkjet printer nozzle to be detected, obtains a picture of the paper tape with the pattern by mature visual detection technology, and extracts pattern features based on the obtained picture, thereby judging whether the UV inkjet printer nozzle to be detected is faulty. The detection of the UV inkjet printer nozzle is simple and efficient, and can effectively eliminate the scrapping of printed products caused by nozzle failure, thereby improving production efficiency. When the nozzle is detected by the fault detection device of the UV inkjet printer nozzle of the utility model, there is no need to disassemble the printer nozzle, and the utility model is widely applicable to various inkjet printer nozzles, and can simultaneously detect whether multiple nozzles are faulty, without relying on manual labor, thereby reducing the workload of staff and reducing waste of human resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic structural diagram of a fault detection device for a UV inkjet printer nozzle according to an embodiment of the present invention.

[0016] Figure numerals: 1. paper tape; 2. visual inspection mechanism; 3. workbench; 4. gantry; 5. transverse linear guide; 6. longitudinal linear guide; 7. transverse slider; 8. longitudinal slider; 9. servo motor one; 10. hydraulic limiter; 11. unwinding roller; 12. winding roller; 13. magnetic powder clutch; 14. transmission belt; 15. servo motor two. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively in conjunction with specific embodiments below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein 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.

[0019] Reference Figure 1 This embodiment proposes a fault detection device for a UV inkjet printer nozzle, including a paper tape 1, a reeling mechanism, a reeling mechanism and a visual detection mechanism 2, and may also include a workbench 3 and a driving mechanism.

[0020] The workbench 3 serves as a bearing component of the entire fault detection device. Rollers are installed at the bottom of the workbench 3 to facilitate the movement of the entire fault detection device.

[0021] The unwinding mechanism comprises an unwinding roller shaft 11 , both ends of which are rotatably connected to unwinding connecting frames, and the unwinding connecting frames are installed on the workbench 3 .

[0022] The winding mechanism includes an unwinding roller shaft 12, a magnetic powder clutch 13, a bevel gear set, a transmission belt 14 and a servo motor 2 15. The unwinding roller shaft 12 is parallel to the unwinding roller shaft 11 and both ends thereof are rotatably connected to a winding connection frame, which is installed on the workbench 3. The power output shaft of the magnetic powder clutch 13 is transmission-connected to one end of the unwinding roller shaft 12 through a bevel gear set, and the power input shaft of the magnetic powder clutch 13 is transmission-connected to the output shaft of the servo motor 2 15 through a transmission belt 14, and the servo motor 2 15 is installed on the workbench 3.

[0023] One end of the paper tape 1 is wound around the unwinding roller 11, and the other end of the paper tape 1 is wound around the unwinding roller 12. When the servo motor 15 is started, the servo motor 15 drives the unwinding roller 12 to rotate through the transmission belt 14, the magnetic powder clutch 13, and the bevel gear set. The unwinding roller 12 rotates to rewind the paper tape 1, thereby driving the unwinding roller 11 to rotate for unwinding. A pattern is sprayed on the paper tape 1 in advance by the nozzle of the UV inkjet printer to be tested. In this embodiment, the pattern is a straight line.

[0024] The driving mechanism includes a gantry 4, a transverse linear guide 5, a longitudinal linear guide 6, a transverse driving member and a longitudinal driving member. The gantry 4 is mounted on the workbench 3 and is located on the side of the unwinding roller shaft 11 away from the unwinding roller shaft 12. The transverse linear guide 5 is horizontally arranged and mounted on the gantry 4, and hydraulic limiters 10 are provided at both ends of the transverse linear guide. A transverse slider 7 is slidably mounted on the transverse linear guide 5, and the transverse driving member drives the transverse slider 7 to move horizontally on the transverse linear guide 5. In this embodiment, the transverse driving member includes a rodless cylinder. The longitudinal linear guide 6 is vertically arranged and mounted on the transverse slider 7, and a position sensor for detecting the moving distance of the longitudinal slider is installed at the top of the longitudinal linear guide. A longitudinal slider 8 is slidably mounted on the longitudinal linear guide 6. The longitudinal driving member drives the longitudinal slider 8 to move vertically on the longitudinal linear guide 6. In this embodiment, the longitudinal driving member includes a servo motor 9 and a ball screw. The servo motor 9 is installed at the top of the longitudinal linear guide 6 and its output shaft is connected to the ball screw. The ball screw runs through the longitudinal slider 8.

[0025] The visual inspection mechanism 2 is installed on the longitudinal slider 8. In this embodiment, the visual inspection mechanism 2 adopts the existing CCD visual inspection component, and the CCD visual inspection component includes an industrial camera and an image processing unit. The industrial camera takes a picture of the paper tape 1 with a pattern, and the image processing unit processes the image taken by the industrial camera and judges whether the UV inkjet printer nozzle is faulty based on the processing result. The processing and judgment method of the image processing unit of this embodiment is the prior art, which extracts the features of the straight line by analyzing and comparing the extracted features with the preset normal range. These features include length, width, continuity, curvature, etc. (these features can be obtained by calculating the pixel points of the line by the existing algorithm, which will not be described here). For example, if the width of the extracted line exceeds the preset width threshold, it means that the nozzle may be faulty, and broken, discontinuous or irregular lines indicate that the nozzle may be blocked or damaged; Fault judgment: The image processing unit also outputs a fault signal according to the analysis result, triggers an alarm, prompts that the UV inkjet printer nozzle is faulty, and reminds the corresponding staff to maintain the nozzle.

[0026] When this embodiment is in use, firstly one or more UV inkjet printer heads are used to print a straight line on the paper tape 1, and the visual detection mechanism 2 is driven by the driving mechanism to move so that the straight line on the paper tape 1 is within the shooting range of the industrial camera. At the same time, the winding mechanism starts to wind up so that the industrial camera completes the image shooting. The image processing unit obtains the characteristics of each straight line and uses this to determine whether the corresponding UV inkjet printer head is blocked or has a broken needle. When the image processing unit determines that there is a fault in the UV inkjet printer head, the on-site alarm is triggered to prompt that the inkjet printer head has a fault so that the staff can deal with it in time.

[0027] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fault detection device for a UV inkjet printer nozzle, characterized in that: The invention comprises a paper tape (1), an unwinding mechanism, a rewinding mechanism and a visual inspection mechanism (2); the paper tape (1) carries a pattern sprayed by the nozzle of the UV inkjet printer; the unwinding mechanism and the rewinding mechanism are used to unwind and rewind the paper tape (1) respectively; and the visual inspection mechanism (2) is used to take a picture of the paper tape (1) and judge whether the nozzle of the UV inkjet printer is faulty based on the taken picture.

2. The fault detection device for a UV inkjet printer nozzle according to claim 1, characterized in that: It also includes a workbench (3) and a driving mechanism. The unwinding mechanism, the rewinding mechanism and the driving mechanism are all installed on the workbench (3). The driving mechanism is used to drive the visual detection mechanism (2) to move horizontally and vertically on the paper tape (1).

3. The fault detection device for a UV inkjet printer nozzle according to claim 2, characterized in that: The driving mechanism comprises a gantry (4), a transverse linear guide (5), a longitudinal linear guide (6), a transverse driving member and a longitudinal driving member; the gantry (4) is mounted on the workbench (3), the transverse linear guide (5) is horizontally arranged and mounted on the gantry (4), a transverse slider (7) is slidably mounted on the transverse linear guide (5), and the transverse driving member drives the transverse slider (7) to move horizontally on the transverse linear guide (5); the longitudinal linear guide (6) is vertically arranged and mounted on the transverse slider (7), a longitudinal slider (8) is slidably mounted on the longitudinal linear guide (6), and the longitudinal driving member drives the longitudinal slider (8) to move vertically on the longitudinal linear guide (6); and the visual inspection mechanism (2) is mounted on the longitudinal slider (8).

4. The fault detection device for a UV inkjet printer nozzle according to claim 3, characterized in that: The transverse driving member adopts a rodless cylinder, and hydraulic limiters (10) are arranged at both ends of the transverse linear guide rail (5).

5. The UV inkjet printer nozzle fault detection device according to claim 3, characterized in that: The longitudinal driving member comprises a servo motor (9) and a ball screw. The servo motor (9) is mounted on the top end of the longitudinal linear guide rail (6) and its output shaft is transmission-connected to the ball screw. The ball screw passes through the longitudinal slider (8).

6. The fault detection device for a UV inkjet printer nozzle according to claim 3, characterized in that: A position sensor for detecting the moving distance of the longitudinal slide block (8) is installed at the top end of the longitudinal linear slide rail.

7. The fault detection device for a UV inkjet printer nozzle according to claim 2, characterized in that: The unwinding mechanism comprises an unwinding roller shaft (11), both ends of which are rotatably connected to an unwinding connecting frame, and the unwinding connecting frame is installed on a workbench (3).

8. The UV inkjet printer nozzle fault detection device according to claim 7, characterized in that: The winding mechanism comprises a winding roller shaft (12), a magnetic powder clutch (13), a bevel gear set, a transmission belt (14) and a second servo motor (15); the winding roller shaft (12) is parallel to the unwinding roller shaft (11) and both ends thereof are rotatably connected to a winding connection frame, the winding connection frame is installed on a workbench (3), the power output shaft of the magnetic powder clutch (13) is transmission-connected to one end of the winding roller shaft (12) through the bevel gear set, the power input shaft of the magnetic powder clutch (13) is transmission-connected to the output shaft of the second servo motor (15) through the transmission belt (14), and the second servo motor (15) is installed on the workbench (3).

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