[Abstract] This article introduces the detection method for the new drum-type label paper position of the YB47 hard box packaging machine, based on the method adopted for controlling the position accuracy of label paper. The relevant hardware and calculation methods are analyzed. [Keywords] YB47 hard box packaging machine, label paper component, No. 2 drum position detection. The label paper component of the ZB47 hard box packaging machine (YB47) incorporates a new design concept, which places higher demands on the position accuracy of the label paper when it enters the workstation. This article discusses how to detect the position of the label paper after it enters the drum in the YB47 hard box packaging machine. I. Label Paper Conveying Principle 1. New Label Paper Component The design speed of the ZB47 hard box packaging machine is 550 packs/minute. In comparison, the original label paper reciprocating pickup method from the suction cup to the turret in the ZB45 (GDX2) packaging machine can no longer meet the high-speed requirements. Therefore, the newly designed label paper conveying mechanism consists of three suction drums with negative pressure. After the label paper is picked up from the paper warehouse, the three drums rotate and convey it to the belt guide rail until the label paper is packaged into the cigarette pack. As shown in Figure 1. [align=center] Figure 1 Label paper components of YB47 hard box packaging machine[/align] 2. Requirements for the positional accuracy of the label paper In the YB47 hard box packaging machine, there is no mold box on the label paper conveying drum. The label paper is completely adsorbed on a specific position of the drum by the negative pressure on the drum and circulates within the dynamic range of suction and release. Ideally, the relative position of the label paper at each station of the drum should be the same. If the label paper is offset on the drum due to the material of the label paper itself or due to centrifugal force when the drum rotates at high speed, then the label paper will produce unqualified cigarette packs after entering the No. 5 wheel. Therefore, we need to detect the position of the label paper on the drum to ensure its positional accuracy. II. Drum Roller Label Paper Position Detection Method 1. Hardware Solution To check whether the label paper has shifted on the drum roller, it can be determined by checking whether the inner and outer edges of the label paper appear in the same phase area. As shown in Figure 2. [align=center] Figure 2[/align] Unlike ordinary detection scenarios, label paper position detection requires sampling and comparison within a very small phase interval. Therefore, the detection device must have extremely low light diffusion to ensure sufficient sampling accuracy. For this purpose, the YB47 hard box packaging machine uses a laser reflection photoelectric detector, model BAUMER OHDM 16P5012/S14 VN, which emits light with a wavelength of 630nm～680nm, PNP output, and is installed at position 16 near the No. 2 drum roller of the label paper. There are two of them, product numbers 2B424 and 2B426, which are responsible for sampling the label paper edges on the inner and outer sides of the drum roller, respectively. Due to software requirements, the two input points are defined on the encoder board. Because the GD MICRO-II control system provides feature-rich software instructions, a relatively simplified hardware design can be adopted, enabling the equipment to have relatively complex functions. 2. Specific calculation method and equipment function: On drum 2, the position of the label paper has the following situations: the label paper is shifted forward on one side, the label paper is in the normal position, and the label paper is shifted backward or lost on one side. The YB47 hard box packaging machine uses three consecutive mechanical phase intervals to represent these three situations respectively. First, let these three phase intervals be interval 1, interval 2, and interval 3, with the interval phase values ​​increasing sequentially. According to the actual mechanical phase, the starting phase of interval 1 is 130°, the boundary phase between interval 1 and interval 2 is 140°, the boundary phase between interval 2 and interval 3 is 158°, and the ending phase of interval 3 is 168°. As shown in Figure 3. [align=center]Figure 3[/align] If the phase value sampled by one of laser detectors 2B424 and 2B426 belongs to interval 1 (indicating that one side of the label paper appears earlier), it means that at least one side of the label paper has shifted forward; if the phase value sampled by one of laser detectors 2B424 and 2B426 belongs to interval 3 (indicating that one side of the label paper appears later), it means that at least one side of the label paper has shifted backward; if neither laser detector 2B424 nor 2B426 samples the edge of the label paper, it means that the label paper is missing; if the label paper is in the normal position, then both laser detectors 2B424 and 2B426 should sample the edge of the label paper in phase interval 2. Based on the above reasoning, we can mark the different results obtained from phase sampling using software. After the sampling process of a label paper station is completely completed (phase interval 3 ends), the marks are judged to determine whether the label paper has deviated from the normal position. After understanding the principle of the label paper position detection on drum 2, you can develop your own GD MICRO-II control software. The idea is to define a label paper inner sampling marker (xx_2nd_drum_blank_internal_check_status_ivr) in the program, with an initial value of 0. If the label paper inner side shifts forward, the sampling marker is assigned a value of 1; if the label paper is in the correct position, the sampling marker is assigned a value of 2; if the label paper inner side shifts backward, the sampling marker is assigned a value of 3. Similar to the laser detector 2B424, 2B426 also uses the same sampling steps. After sampling the label paper position, if both the inner and outer sampling marks are 0, it indicates that the laser detector did not detect the label paper, meaning the label paper is missing. The YB47 hard-pack packaging machine will remove the corresponding cigarette pack and the corresponding inner frame paper from wheel 3. If both the inner and outer sampling marks are 2, the label paper is in the correct position. If either the inner or outer sampling mark is 1 or 3, the label paper has shifted forward or backward. The YB47 hard-pack packaging machine will remove the label paper from drum 2, and simultaneously remove the corresponding label paper and the corresponding inner frame paper from drum 3. If the label paper is missing three times consecutively, the machine will stop, and the IPC will display the red message "NO BLANK ON 2ND DRUM". Similarly, if the label paper shifts three times consecutively, the machine will stop, and the IPC will display the red message "DISALIGNED BLANK ON 2ND DRUM". The boundary phases between phase intervals 1, 2, and 3 are defined by four electrical parameters, the values ​​of which can be modified through the IPC human-machine interface. The IPC displays the following phase parameters: Start phase parameter for interval 1: "START PHASE: BLANK POSIT. — 2ND DRUM" (default value is 130°); Boundary phase parameter for interval 1/2: "START PHASE: BLANK ALIGN CHK ON 2ND DRUM" (default value is 140°); Boundary phase parameter for interval 2/3: "STOP PHASE: BLANK ALIGN CHK ON 2ND DRUM" (default value is 158°); End phase parameter for interval 3: "STOP PHASE: BLANK POSIT. — 2ND DRUM" (default value is 168°). To ensure the proper functioning of laser detectors 2B424 and 2B426, the order of these four phase parameters must strictly follow the following sequence: End of interval 3 → Boundary of interval 2/3 → Boundary of interval 1/2 → Start of interval 1. If the logical sequence is violated, the IPC will display the red message "INCOHERENCY: CHECK TIMING ON 2ND DRUM". The YB47 hard-pack packaging machine cannot be reset and restarted until the parameter sequence is restored to correct. The above method can significantly increase the speed of the hard-pack packaging machine while maintaining high quality of cigarette label packaging, achieving a good balance between the two. [Author Bio] Pan Jie currently works at Shanghai Tobacco Machinery Co., Ltd., primarily engaged in the electrical design of tobacco machinery equipment.