A positioning mechanism for a printing device

Abstract

The utility model discloses a positioning mechanism for printing device, including frame, be provided with work bench on the frame, the work bench top is from front to back to set gradually guide component, positioning assembly and printing assembly, the positioning piece includes the positioning disc of fixed cover and set on the positioning roll, the outer edge of positioning disc is set up with the positioning groove of printing paperboard to be printed and printing paperboard to be printed and is positioned and is contacted with and is matched, the utility model positioning mechanism is through the symmetrical guide groove of guide component and is initially regular and is printed paperboard's position, and then by servo motor power group drive positioning roll rotation, drive the positioning groove on the positioning disc and paperboard edge accurate contact, realize mechanical hard limit, after positioning, servo motor continues to control the quantitative rotation of positioning roll, makes paperboard accurate forward delivery to printing work station according to setting distance, solved the printing position deviation problem that traditional printing machine led to because of not accurate positioning, through the positioning and conveying integration structure of mechanical coupling, the consistency of printing precision is improved significantly.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a positioning mechanism for a printing device. Background Technology

[0002] As described in the published patent CN215153019U, "A Novel Printing Machine for Convenient Positioning Printing," a printing machine is a machine for printing text and images. Modern printing machines generally consist of plate mounting, inking, printing, paper feeding, and folding mechanisms. Its working principle is as follows: first, the text and images to be printed are made into a printing plate and mounted on the printing machine. Then, ink is applied to the areas with text and images on the printing plate by hand or the printing machine. The ink is then directly or indirectly transferred to paper or other substrates, such as textiles, metal plates, plastics, leather, wood boards, glass, and ceramics, thereby reproducing printed products identical to the printing plate. This novel printing machine for convenient positioning printing is usually used when precise positioning is required during printing.

[0003] However, most printing presses currently in use are not convenient for positioning during printing, which leads to inaccurate printing positions, affecting the printing effect. Inaccurate positioning also requires reprinting, wasting resources and reducing work efficiency.

[0004] In summary, among the related technologies of printing presses, some printing presses have the problem of inaccurate positioning of the product to be printed, which affects the printing effect. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution for a positioning mechanism in a printing device that can solve the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A positioning mechanism for a printing apparatus includes a frame, a worktable disposed on the frame, and a guide assembly, a positioning assembly, and a printing assembly arranged sequentially from front to back on the worktable. The guiding assembly includes a guide shaft fixed to the frame, guide blocks symmetrically mounted on the left and right sides of the guide shaft, and guide grooves formed on the inner side of the guide blocks; The positioning assembly includes a mounting plate mounted on a frame, a positioning roller rotatably mounted on the mounting plate, a transmission gear mounted at the end of the positioning roller, and a servo motor power unit mounted on the frame to drive the transmission gear. The positioning roller is symmetrically equipped with positioning components, each including a positioning disk fixedly sleeved on the positioning roller. The positioning disk rotates with the positioning roller, and the outer edge of the positioning disk has a positioning groove for positioning and engaging with the paperboard to be printed.

[0007] As a further embodiment of this utility model: a limiting plate is fixedly installed on the outer side of the positioning plate, the diameter of the limiting plate is larger than that of the positioning plate, and the inner side of the limiting plate is in limiting and abutting cooperation with the paperboard to be printed.

[0008] As a further embodiment of this utility model: the positioning groove includes a vertical inner wall that engages with the paperboard to be printed and a horizontal inner wall that is parallel to the feeding direction of the paperboard to be printed.

[0009] As a further embodiment of this utility model: the positioning plate has a through positioning mounting groove, the side wall of the positioning mounting groove has a bolt mounting hole communicating with the positioning groove, and the bolt mounting hole is fitted with a fastening bolt spanning both sides of the positioning mounting groove.

[0010] As a further embodiment of this utility model: a limiting mounting ring and a snap-fit ​​mounting ring are sequentially formed on the outer side of the positioning disk. The limiting disk is mounted on the limiting mounting ring. A snap-fit ​​mounting groove is provided on the snap-fit ​​mounting ring along the circumferential direction. A snap-fit ​​spring is fixedly snapped in the snap-fit ​​mounting groove. The limiting disk is limited and fixed between the snap-fit ​​spring and the positioning disk.

[0011] As a further embodiment of this utility model: a guide connecting rod is provided between the guide shaft and the guide block. One end of the guide connecting rod is sleeved and fixed on the guide shaft, and the other end of the guide connecting rod is provided with a first guide mounting hole. A steering adjustment rod is installed in the first guide mounting hole. One end of the steering adjustment rod that extends into the first guide mounting hole is provided with a first knob mounting hole, and the other end of the steering adjustment rod is provided with a second knob mounting hole. An adjustment knob is screwed into the first knob mounting hole, and an adjustment bolt is screwed into the second knob mounting hole. A lifting adjustment rod extends downward from the guide block, and a lifting adjustment groove is provided on the lifting adjustment rod to cooperate with the insertion and limiting of the adjustment bolt.

[0012] As a further embodiment of this utility model: a second guide mounting hole is provided at one end of the guide connecting rod sleeved on the guide shaft. The cross-section of the guide shaft is rectangular. The guide shaft is sleeved in the second guide mounting hole. A wedge-shaped groove is provided on the side wall of the second guide mounting hole. A wedge-shaped fixing block is inserted into the wedge-shaped groove.

[0013] As a further embodiment of this utility model: an abutting rubber ring is sleeved on the limiting mounting ring, and the abutting rubber ring is disposed between the limiting plate and the positioning plate.

[0014] As a further embodiment of this utility model: the periphery of the positioning disk is provided with a rough surface, and the rough surface abuts and cooperates with the paperboard to be printed.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model's positioning mechanism initially aligns the position of the paperboard to be printed using symmetrical guide grooves in the guide assembly. Subsequently, a servo motor drives the positioning roller to rotate, causing the positioning groove on the positioning plate to precisely abut against the edge of the paperboard, achieving mechanical hard positioning. After positioning, the servo motor continues to control the positioning roller to rotate quantitatively, ensuring that the paperboard is accurately conveyed forward to the printing station at a set distance. This solves the problem of printing position deviation caused by inaccurate positioning in traditional printing machines. Through the integrated mechanically coupled positioning and conveying structure, the consistency of printing accuracy is significantly improved. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of the present invention; Figure 2 This is another three-dimensional view of the structure of this utility model; Figure 3 This is a three-dimensional structural view of the guide component and the positioning component in this utility model; Figure 4 This is a three-dimensional structural view of the positioning component in this utility model; Figure 5 This is a three-dimensional view of the positioning disk in this utility model; Figure 6 This is an exploded view of the positioning disk structure in this utility model; Figure 7 This is another three-dimensional view of the positioning disk in this utility model; Figure 8 This is a three-dimensional structural view of the guide component in this utility model; Figure 9 This is another three-dimensional view of the guide component in this utility model; Figure 10 This is a three-dimensional view of the steering adjustment rod in this utility model; The reference numerals and names in the figure are as follows: Frame-100, Worktable-101, Guide Assembly-102, Positioning Assembly-103, Printing Assembly-104, Guide Shaft-105, Guide Block-106, Guide Groove-107, Mounting Plate-108, Positioning Roller-109, Transmission Gear-110, Positioning Component-112, Positioning Plate-113, Positioning Groove-114, Limiting Plate-115, Positioning Mounting Groove-116, Bolt Mounting Hole-117, Fastening Bolt-118, Limiting Mounting Ring-119 Snap-fit ​​mounting ring-120, snap-fit ​​mounting groove-121, snap-fit ​​spring-122, guide connecting rod-123, first guide mounting hole-125, steering adjustment rod-126, first knob mounting hole-127, second knob mounting hole-128, adjustment knob-129, adjustment bolt-130, lifting adjustment rod-131, lifting adjustment groove-132, second guide mounting hole-133, wedge groove-134, wedge fixing block-135, abutment rubber ring-136. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-10 A positioning mechanism for a printing apparatus includes a frame 100, a worktable 101 is provided on the frame 100, and a guide assembly 102, a positioning assembly 103 and a printing assembly 104 are arranged sequentially from front to back above the worktable 101. The guide assembly 102 includes a guide shaft 105 fixed to the frame 100, and guide blocks 106 are symmetrically mounted on the left and right sides of the guide shaft 105. The inner side of the guide block 106 is provided with a guide groove 107. The positioning assembly 103 includes a mounting plate 108 mounted on a frame 100, a positioning roller 109 rotatably mounted on the mounting plate 108, a transmission gear 110 mounted at the end of the positioning roller 109, and a servo motor power unit mounted on the frame 100 to drive the transmission gear 110. Positioning components 112 are symmetrically mounted on the positioning roller 109. The positioning component 112 includes a positioning disk 113 fixedly sleeved on the positioning roller 109. The positioning disk 113 rotates with the positioning roller 109. The outer edge of the positioning disk 113 is provided with a positioning groove 114 for positioning and engaging with the paperboard to be printed. like Figure 1 , 2As shown in Figure 3, the positioning mechanism of this utility model uses the symmetrical guide groove 107 of the guide component 102 to perform preliminary straightening and centering of the paperboard to be printed, effectively eliminating the positional deviation of the paperboard before entering the precision positioning area. The servo motor drives the positioning roller 109 to rotate, bringing the initial positioning groove 114 closer to the worktable 101. After the feeding device transports the paperboard to be printed onto the worktable 101, the specific contour positioning groove 114 on the positioning disk 113 achieves high-precision mechanical hard contact with the edge of the paperboard, constituting the first accurate positioning, completely solving the cumulative error and slippage problems caused by traditional positioning relying on friction or vision. After positioning is completed, the servo motor drives the positioning roller 109 and its positioning disk 113 to rotate precisely by a predetermined angle through the transmission gear 110, utilizing... The rotation of the positioning disk 113 moves the paperboard to be printed forward by a fixed step distance, achieving a seamless connection between positioning and conveying functions. This fundamentally eliminates the secondary positioning error that may occur due to the separation of the positioning and conveying mechanisms, ensuring that each paperboard to be printed has high-quality repeatability and consistency when it is conveyed to the position below the printing component 104. Through the combination of innovative mechanical structure design and closed-loop servo control, a continuous action of "positioning-quantitative conveying-printing" is formed. This design not only greatly improves the accuracy and stability of the printed pattern position, but also significantly reduces the scrap rate caused by misregistration. It should be noted that the outer wall of the positioning disk 113 is provided with a rough surface, and the worktable 101 is provided with a smooth surface. The rough surface of the positioning disk 113 is used to drive the paperboard to be printed to be conveyed, so as to realize the precise displacement of the paperboard to be printed. It should be noted that the operation of the printing component 104 is a common technique in the field, and will not be described in detail here; It should be noted that the gap between the positioning plate 113 and the worktable 101 is matched with the thickness of the paperboard to be printed. The frame 100 is equipped with a height adjustment component for adjusting the height of the positioning roller 109. The height adjustment component is a common technology in the field and will not be described in detail here. The servo motor power unit is a common technology in this field and will not be described in detail here; The positioning mechanism of this utility model initially aligns the position of the paperboard to be printed through the symmetrical guide grooves 107 of the guide component 102. Then, the positioning roller 109 is driven to rotate by the servo motor power unit, which drives the positioning groove 114 on the positioning disk 113 to precisely abut against the edge of the paperboard, realizing mechanical hard positioning. After positioning, the servo motor continues to control the positioning roller 109 to rotate quantitatively, so that the paperboard is accurately conveyed forward to the printing station at a set distance. This solves the problem of printing position deviation caused by inaccurate positioning in traditional printing machines. Through the integrated structure of mechanically coupled positioning and conveying, the consistency of printing accuracy is significantly improved.

[0019] In this embodiment of the utility model, a limiting disk 115 is fixedly installed on the outer side of the positioning disk 113. The diameter of the limiting disk 115 is larger than that of the positioning disk 113, and the inner side of the limiting disk 115 is in limiting abutment with the paperboard to be printed. like Figure 5 As shown, the limiting disk 115 added to the outside of the positioning disk 113 has a larger diameter than the positioning disk 113. When the positioning groove 114 of the positioning disk 113 positions and abuts against the paperboard to be printed and transports the paperboard to be printed, the inner sidewall of the limiting disk 115 simultaneously forms surface contact with the side of the paperboard and limits its movement. This structure adds lateral constraint on the basis of longitudinal conveying, effectively preventing the paperboard from shifting or twisting laterally during high-speed conveying, further improving the straightness and stability of the paperboard conveying, thereby ensuring the positional accuracy of the paperboard when it finally enters the printing station, reducing the printing scrap rate caused by positional deviation, and improving the reliability and product quality of the entire printing process.

[0020] In this embodiment of the present invention, the positioning groove 114 includes a vertical inner wall that engages with the paperboard to be printed and a transverse inner wall that is parallel to the feeding direction of the paperboard to be printed. like Figure 5 As shown, the unique structure of the positioning groove 114 includes a vertical inner wall that abuts against the paperboard to be printed and a horizontal inner wall that is parallel to the feeding direction. During operation, the horizontal inner wall acts as a guiding slope, allowing the paperboard to slide in smoothly. Subsequently, the vertical inner wall and the edge of the paperboard achieve precise vertical contact and abutment, completing the hard limit. By separating the guiding function and the positioning function, the risk of paper jams is significantly reduced, ensuring the speed and stability of the positioning action, while enhancing the rigidity and accuracy of the positioning contact.

[0021] In this embodiment of the utility model, the positioning disk 113 is provided with a through positioning mounting groove 116, and the side wall of the positioning mounting groove 116 is provided with a bolt mounting hole 117 communicating with the positioning groove 114. The bolt mounting hole 117 is provided with a fastening bolt 118 spanning both sides of the positioning mounting groove 116. like Figure 5 and Figure 7 As shown, the positioning disk 113 has a through positioning mounting groove 116, and bolt mounting holes 117 communicating with the positioning groove 114 are provided on the side wall of the positioning mounting groove 116, so that the fastening bolts 118 can span and press the two sides of the positioning mounting groove 116. By tightening or loosening the bolts, the installation position of the positioning disk 113 in the axial direction of the positioning roller 109 can be easily adjusted, or it can be completely disassembled, realizing the rapid position adjustment and replacement of the positioning disk 113, greatly improving the adaptability to different specifications of cardboard, and simplifying the equipment debugging and maintenance process.

[0022] In this embodiment of the utility model, a limiting mounting ring 119 and a snap-fit ​​mounting ring 120 are sequentially formed on the outer side of the positioning disk 113. The limiting disk 115 is mounted on the limiting mounting ring 119. A snap-fit ​​mounting groove 121 is provided on the snap-fit ​​mounting ring 120 along the circumferential direction. A snap-fit ​​spring 122 is fixedly snapped in the snap-fit ​​mounting groove 121. The limiting disk 115 is limited and fixed between the snap-fit ​​spring 122 and the positioning disk 113. like Figure 6 and Figure 7 As shown, a limiting mounting ring 119 and a snap-fit ​​mounting ring 120 are sequentially formed on the outer side of the positioning disc 113. The limiting disc 115 is initially fitted onto the limiting mounting ring 119 for radial positioning. Then, the snap-fit ​​spring 122 is fixedly snapped into the snap-fit ​​mounting groove 121 of the snap-fit ​​mounting ring 120 in the circumferential direction. The radial pressure generated by the elastic deformation of the snap-fit ​​spring 122 is used to fix the snap-fit ​​spring 122 in the snap-fit ​​mounting groove 121, thereby firmly clamping the limiting disc 115 between the snap-fit ​​spring 122 and the body of the positioning disc 113. This achieves boltless quick assembly and locking of the limiting disc 115.

[0023] In this embodiment of the utility model, a guide connecting rod 123 is provided between the guide shaft 105 and the guide block 106. One end of the guide connecting rod 123 is sleeved and fixed on the guide shaft 105, and the other end of the guide connecting rod 123 is provided with a first guide mounting hole 125. A steering adjustment rod 126 is installed in the first guide mounting hole 125. One end of the steering adjustment rod 126 that extends into the first guide mounting hole 125 is provided with a first knob mounting hole 127, and the other end of the steering adjustment rod 126 is provided with a second knob mounting hole 128. An adjustment knob 129 is screwed into the first knob mounting hole 127, and an adjustment bolt 130 is screwed into the second knob mounting hole 128. A lifting adjustment rod 131 extends downward from the guide block 106, and a lifting adjustment groove 132 is provided on the lifting adjustment rod 131 to cooperate with the adjustment bolt 130 for insertion and limiting. like Figure 10 As shown, during the process of the feeding device conveying the paperboard to be printed to the positioning plate 113, the paperboard to be printed needs to pass through the guide groove 107 on the guide block 106, and the guide groove 107 provides initial limiting and guidance for the paperboard to be printed. During the process of the paperboard to be printed passing through the guide groove 107, in order to better adapt to the operation of the positioning plate 113, the height of the guide groove 107 needs to be adjusted. During the process of adjusting the height of the guide groove 107, the steering adjustment rod 126 can be adjusted in the first guide mounting hole 125 by tightening or loosening the adjustment knob 129, and the lifting adjustment rod 131 can be adjusted by tightening or loosening the adjustment bolt 130. First, loosen the adjustment knob 129, adjust the steering adjustment rod 126 to a suitable angle, and then tighten the adjustment knob 129 to lock the steering adjustment rod 126 in the first guide mounting hole 125, thereby achieving precise adjustment of the angle of the guide block 106. Then loosen the adjusting bolt 130, adjust the lifting adjusting rod 131 to a suitable height, and tighten the adjusting bolt 130. The adjusting bolt 130 locks the lifting adjusting rod 131 to the end of the steering adjusting rod 126 through the insertion and limiting cooperation with the lifting adjusting groove 132, thereby realizing the precise adjustment of the height of the guide block 106.

[0024] In this embodiment of the utility model, the guide connecting rod 123 is sleeved on the guide shaft 105 and has a second guide mounting hole 133 at one end. The guide shaft 105 has a rectangular cross-section and is sleeved in the second guide mounting hole 133. The side wall of the second guide mounting hole 133 has a wedge groove 134 and a wedge fixing block 135 is inserted into the wedge groove 134. like Figure 9 As shown, by pulling out the wedge-shaped fixing block 135, the guide connecting rod 123 can be quickly axially adjusted on the guide shaft 105, so as to adapt to different specifications of cardboard. After adjustment, the wedge-shaped fixing block 135 is inserted into the wedge groove 134, which can quickly fix the guide connecting rod 123 on the guide shaft 105. In one embodiment, the wedge-shaped fixing block 135 includes a wedge-shaped hard rubber sheet, which can achieve stable engagement and avoid mechanical damage to the guide shaft 105 caused by the wedge-shaped fixing block 135 being stuck in the wedge groove 134.

[0025] In this embodiment of the present invention, an abutting rubber ring 136 is sleeved on the limiting installation ring 119, and the abutting rubber ring 136 is disposed between the limiting plate 115 and the positioning plate 113. When the limit plate 115 is tightened, the rubber ring is elastically compressed. The elastic deformation of the material not only effectively fills the assembly gap between the parts and suppresses the minor vibrations and abnormal noises that may be generated during high-speed operation, but also avoids hard collisions and wear between metal parts through flexible contact.

[0026] In this embodiment of the utility model, the periphery of the positioning disk 113 is provided with a rough surface, and the rough surface abuts and cooperates with the paperboard to be printed; The positioning disk 113 has a rough surface around its periphery, which increases the coefficient of friction between the disk and the paperboard to be printed. When the positioning groove 114 of the positioning disk 113 comes into contact with the edge of the paperboard, the rotation of the positioning disk 113 drives the paperboard to be printed forward. The rough surface generates greater friction, which effectively prevents relative sliding or slippage between the paperboard and the positioning disk 113, ensuring reliable transmission of positioning driving force and guaranteeing the accuracy and consistency of paperboard quantitative feeding. This fundamentally avoids printing position errors caused by slippage during feeding, and improves the stability of the entire printing process and the quality of the finished product.

[0027] In one embodiment, for a glossy paperboard (with a film covering its surface) or plastic sheet to be printed, the periphery of the positioning disk 113 is provided with an adhesive surface. The adhesive surface abuts against the paperboard to be printed and can generate an adhesive force with the paperboard or plastic sheet to be printed, effectively preventing relative sliding or slippage between the paperboard to be printed and the positioning disk 113. It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A positioning mechanism for a printing apparatus, comprising a frame (100), a worktable (101) disposed on the frame (100), and a guide assembly (102), a positioning assembly (103), and a printing assembly (104) arranged sequentially from front to back above the worktable (101), characterized in that: The guide assembly (102) includes a guide shaft (105) fixed to the frame (100), and guide blocks (106) are symmetrically mounted on the left and right sides of the guide shaft (105). A guide groove (107) is opened on the inner side of the guide block (106). The positioning assembly (103) includes a mounting plate (108) mounted on a frame (100), a positioning roller (109) rotatably mounted on the mounting plate (108), a transmission gear (110) mounted at the end of the positioning roller (109), and a servo motor power unit for driving the transmission gear (110) mounted on the frame (100). Positioning components (112) are symmetrically mounted on the positioning roller (109). The positioning component (112) includes a positioning disk (113) fixedly sleeved on the positioning roller (109). The positioning disk (113) rotates with the positioning roller (109). The outer edge of the positioning disk (113) is provided with a positioning groove (114) for positioning and engaging with the paperboard to be printed.

2. The positioning mechanism for a printing apparatus according to claim 1, characterized in that, A limiting plate (115) is fixedly installed on the outer side of the positioning plate (113). The diameter of the limiting plate (115) is larger than that of the positioning plate (113). The inner side of the limiting plate (115) is in limiting contact with the paperboard to be printed.

3. A positioning mechanism for a printing apparatus according to claim 1, characterized in that, The positioning groove (114) includes a vertical inner wall that engages with the paperboard to be printed and a horizontal inner wall that is parallel to the feeding direction of the paperboard to be printed.

4. A positioning mechanism for a printing apparatus according to claim 1, characterized in that, The positioning plate (113) has a through positioning mounting groove (116), and the side wall of the positioning mounting groove (116) has a bolt mounting hole (117) communicating with the positioning groove (114). The bolt mounting hole (117) is fitted with a fastening bolt (118) spanning both sides of the positioning mounting groove (116).

5. A positioning mechanism for a printing apparatus according to claim 2, characterized in that, The outer side of the positioning disk (113) is formed with a limiting mounting ring (119) and a snap-fit ​​mounting ring (120). The limiting disk (115) is mounted on the limiting mounting ring (119). The snap-fit ​​mounting ring (120) has a snap-fit ​​mounting groove (121) along the circumferential direction. A snap-fit ​​spring (122) is fixedly snapped in the snap-fit ​​mounting groove (121). The limiting disk (115) is limited and fixed between the snap-fit ​​spring (122) and the positioning disk (113).

6. A positioning mechanism for a printing apparatus according to any one of claims 1-5, characterized in that, A guide connecting rod (123) is provided between the guide shaft (105) and the guide block (106). One end of the guide connecting rod (123) is sleeved and fixed on the guide shaft (105), and the other end of the guide connecting rod (123) is provided with a first guide mounting hole (125). A steering adjustment rod (126) is installed in the first guide mounting hole (125), and the end of the steering adjustment rod (126) that extends into the first guide mounting hole (125) is provided with a first knob mounting hole. 127), the other end of the steering adjustment rod (126) is provided with a second knob mounting hole (128), an adjustment knob (129) is screwed into the first knob mounting hole (127), an adjustment bolt (130) is screwed into the second knob mounting hole (128), a lifting adjustment rod (131) extends downward on the guide block (106), and a lifting adjustment groove (132) is provided on the lifting adjustment rod (131) to cooperate with the adjustment bolt (130) for insertion and limiting.

7. A positioning mechanism for a printing apparatus according to claim 6, characterized in that, The guide connecting rod (123) is sleeved on the guide shaft (105) and has a second guide mounting hole (133) at one end. The guide shaft (105) has a rectangular cross-section and is sleeved in the second guide mounting hole (133). The side wall of the second guide mounting hole (133) has a wedge groove (134) and a wedge fixing block (135) is inserted into the wedge groove (134).

8. A positioning mechanism for a printing apparatus according to claim 5, characterized in that, The limiting installation ring (119) is fitted with an abutting rubber ring (136), which is located between the limiting plate (115) and the positioning plate (113).

9. A positioning mechanism for a printing apparatus according to claim 8, characterized in that, The positioning disk (113) has a rough surface around its periphery, which abuts against the paperboard to be printed.

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