A quick lock device for positioning a doctor blade of a printing press

Abstract

This utility model discloses a quick-locking device for positioning a doctor blade in a printing press. The printing press includes a doctor blade body and an anilox roller, with a doctor blade positioned between them. The device includes U-shaped pressure strips detachably mounted on the upper and lower ends of the doctor blade body. One side is a flat pressure plate that presses the doctor blade firmly onto the doctor blade body, and the other side has a C-shaped strip. Rotary camshafts are located at the upper and lower ends of the doctor blade body within the openings of the C-shaped strips. Rotating the camshafts allows the flat pressure plate to press or release the doctor blade. The upper half of the flat pressure plate is positioned against the doctor blade body via an L-shaped positioning protrusion and groove. The camshaft is a flattened elliptical shaft. This device enables precise positioning during quick doctor blade removal and installation, ensuring a flat doctor blade, improving printing quality and doctor blade life, and facilitating the removal and cleaning of the pressure strips.

Description

Technical Field

[0001] This utility model relates to the printing field, specifically to a doctor blade positioning quick-lock device for a printing press. Background Technology

[0002] In the printing process, the doctor blade, as a key component, plays a crucial role in supplying ink, coatings, and other coatings. Its positioning accuracy and installation stability directly affect printing quality and production efficiency. Currently, the industry commonly uses a clamping strip to fix the doctor blade to the doctor blade body; however, this technical solution has revealed a series of problems that urgently need to be addressed in practical applications:

[0003] 1. The contradiction between printing quality and doctor blade wear is prominent.

[0004] Traditional doctor blades and anilox rollers have a line contact. This structure applies uneven localized pressure to the doctor blade during locking, causing it to undergo corrugated plastic deformation. The resulting fluctuations in ink transfer between the deformed doctor blade and the anilox roller lead to uneven ink distribution, resulting in defects such as color spots, white gaps, and inconsistent ink layer thickness on printed materials. To mitigate this, operators are often forced to increase the contact pressure between the doctor blade and the anilox roller. However, this drastically increases frictional wear between the doctor blade edge and the anilox roller surface, potentially shortening the doctor blade's lifespan by 30%-50% and accelerating anilox roller wear, further increasing equipment maintenance costs.

[0005] 2. The disassembly process is complex and limited by space.

[0006] The existing pressure bar locking shaft uses an axial pull-out design. When the internal space of the printing press is compact (such as narrow-format printing equipment or multi-unit linkage models), it is difficult for operators to directly disassemble the locking shaft. In this case, the entire doctor blade system must be disassembled from the printing press, which seriously affects the continuous operation efficiency of the equipment. Especially in scenarios where doctor blades are frequently changed for different production processes, the inefficient disassembly process becomes a bottleneck restricting capacity improvement.

[0007] 3. Inefficiency of bolt fixing method

[0008] Some equipment uses bolts to fix the pressure strip to the scraper body. While this method provides a certain locking force, each disassembly requires using tools to loosen the bolts one by one, which is cumbersome and prone to failure due to bolt stripping, corrosion, or other issues. In addition, the bolt-fixed pressure strip may loosen under long-term vibration conditions, causing the scraper to shift and affecting printing accuracy. Regular tightening and maintenance are required, increasing labor costs and downtime.

[0009] These technological bottlenecks not only lead to challenges for printing companies, such as insufficient quality stability and high production costs, but also make it difficult to adapt to the high-speed and intelligent production demands of the modern printing industry. Therefore, developing a doctor blade positioning device that combines rapid assembly and disassembly, precise positioning, and stable clamping functions has become an urgent need for the industry. Utility Model Content

[0010] This utility model provides a doctor blade positioning quick-lock device for a printing press. The printing press is equipped with a doctor blade body and an anilox roller. A doctor blade is provided between the doctor blade body and the anilox roller on the same side at both ends of the doctor blade body. The doctor blade positioning quick-lock device includes two U-shaped pressure strips that are detachably installed at the upper and lower ends of the doctor blade body. The U-shaped pressure strips are fastened to the doctor blade body and are located on the left and right sides of the doctor blade body respectively. The side of the U-shaped pressure strip closest to the doctor blade is a flat pressure plate that acts on the outer surface of the doctor blade and presses it tightly onto the doctor blade body. The second side of the U-shaped pressure strip is provided with a C-shaped strip.

[0011] The lower half of the flat pressing plate is used to press the scraper, and the upper half of the flat pressing plate is in contact with the scraper body. The inner side of the upper half of the flat pressing plate and the scraper body are respectively provided with matching L-shaped positioning protrusions and positioning grooves.

[0012] The scraper body has cavities at both the top and bottom for accommodating C-shaped strips. A camshaft located inside the opening of the C-shaped strip rotates within the cavity. By rotating the camshaft, the C-shaped strip is acted upon to press or release the scraper with the flat pressure plate. After the scraper is released, the U-shaped pressure strip can be directly removed from both the top and bottom of the scraper body.

[0013] Furthermore, the L-shaped positioning protrusion has a flat structure on the side near the scraper and a semi-circular structure on the side away from the scraper.

[0014] Furthermore, the lower half of the flat pressing plate is used to press the scraper, and the upper half of the flat pressing plate is in contact with the scraper body. The inner side of the upper half of the flat pressing plate and the scraper body are respectively provided with matching L-shaped positioning protrusions and positioning grooves.

[0015] The L-shaped positioning protrusion has a semi-circular structure on one side near the C-shaped strip, and a planar structure on the other side.

[0016] Furthermore, the camshaft is an elliptical shaft.

[0017] Furthermore, an operating handle interface is provided on one side of the camshaft.

[0018] Furthermore, the scraper body is equipped with a limiting mechanism for restricting the rotation angle of the camshaft.

[0019] The doctor blade positioning quick-lock device of this printing press has the following advantages:

[0020] 1. Achieve quick and precise scraper blade installation, saving installation time: Utilizing the characteristics of the long and short axes of an elliptical camshaft, rotating the camshaft drives a U-shaped pressure strip to quickly tighten or loosen the scraper blade, eliminating the need for bolts to tighten or loosen the pressure strip. This convenient operation allows for rapid scraper blade fixation. The L-shaped positioning protrusion on the inner side of the flat pressure plate mates with the positioning groove on the scraper body. The flat surface of the L-shaped positioning protrusion is used for scraper blade positioning during installation, achieving precise positioning of the scraper blade and effectively saving installation time.

[0021] 2. Ensuring doctor blade flatness improves printing quality and extends doctor blade lifespan: The U-shaped pressure strip's flat pressure plate, doctor blade body, and doctor blade contact areas are all flat, and through processing, the flatness is guaranteed to be within the required range. This ensures the doctor blade remains flat when locked, preventing wavy deformation and thus guaranteeing uniform ink distribution on the anilox roller, improving print quality. There's no need to increase the pressure between the doctor blade and the anilox roller to address doctor blade deformation, reducing doctor blade wear and extending its lifespan.

[0022] 3. Easy disassembly of the pressure bar, providing convenience for doctor blade cleaning: After the pressure bar is loosened by rotating the elliptical shaft, the U-shaped pressure bar can be removed from the doctor blade body without pulling the locking shaft out of the end face or removing the fixing bolts. The operation is simple and avoids the cumbersome process of removing the doctor blade system from the printing press and then disassembling the pressure bar due to space constraints, thus providing convenience for doctor blade cleaning. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A structural diagram of a doctor blade positioning quick-lock device for a printing press provided by this utility model;

[0025] Figure 2 A schematic diagram of a scraper body with camshafts at both ends;

[0026] Figure 3 A schematic diagram of a U-shaped molding strip;

[0027] Figure 4 A schematic diagram showing how a U-shaped pressure strip presses the scraper together;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the image;

[0029] Figure 6 A schematic diagram showing the scraper being loosened by a U-shaped pressure strip;

[0030] Figure 7 for Figure 6 Enlarged view of point B in the image. Detailed Implementation

[0031] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0032] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0033] Reference Figure 1-3 As shown, this utility model provides a doctor blade positioning quick-lock device for a printing press. The printing press is provided with a doctor blade body 1 and an anilox roller 2. An upper doctor blade and a lower doctor blade (hereinafter referred to as doctor blade 3) are respectively provided on the same side of the upper and lower ends of the doctor blade body 1 and between the doctor blade body 1 and the anilox roller 2.

[0034] The scraper positioning quick-lock device includes two U-shaped pressure strips 10, detachably installed at the upper and lower ends of the scraper body 1. The U-shaped pressure strips 10 are fastened to the scraper body 1, with their two sides located on the left and right sides of the scraper body 1, respectively. The side of the U-shaped pressure strip 10 closest to the scraper 3 is a flat pressure plate 11 that acts on the outer surface of the scraper 3 and presses it firmly against the scraper body 1. The second side of the U-shaped pressure strip 10 has a C-shaped strip 12. At the upper and lower ends of the scraper body 1, there are cavities 5 for accommodating the C-shaped strip 12. An elliptical camshaft 4 is rotatably mounted within the cavity 5, located inside the opening of the C-shaped strip 12. By rotating the camshaft 4, the flat pressure plate 11 is pressed or released from the scraper 3. After the scraper 3 is released, the U-shaped pressure strips 10 can be directly removed from the upper and lower ends of the scraper body 1.

[0035] In an optional embodiment, the lower half of the planar pressure plate 11 is used to press the scraper 3, and the upper half of the planar pressure plate 11 is in contact with the scraper body 1. The inner side of the upper half of the planar pressure plate 11 and the scraper body 1 are respectively provided with matching L-shaped positioning protrusions 13 and positioning grooves 6. The side of the L-shaped positioning protrusion 13 near the scraper 3 has a planar structure, and the side away from the scraper 3 has a semi-circular structure. The planar side of the L-shaped positioning protrusion 13 is used for positioning the scraper 3 during installation, and the semi-circular side is used for limiting the pressure strip on the scraper body 1. The advantage of the semi-circular structure is that it has a line contact with the scraper body 1, resulting in less resistance, and facilitates the locking of the scraper and the disassembly of the U-shaped pressure strip 10.

[0036] This invention utilizes the characteristic of an elliptical camshaft having a major axis and a minor axis. By rotating the camshaft, the U-shaped pressure strip 10 is moved, thereby quickly tightening or loosening the scraper 3 without the need for bolts to fix the U-shaped pressure strip 10. The contact areas between the U-shaped pressure strip 10, the outer surface of the scraper body 1, and the scraper 3 are all flat, and their flatness can be ensured within the required range through processing. When the U-shaped pressure strip 10 is locked, the flatness of the scraper 3 is guaranteed.

[0037] In an optional embodiment, an operating handle interface is provided on one side of the camshaft, which allows the camshaft to be rotated to tighten or loosen the scraper 3. Optionally, the end face of the scraper body 1 is provided with a limiting structure to limit the rotation angle of the operating handle, and is also equipped with a quick-release slot to facilitate the quick removal of the U-shaped pressure strip 10.

[0038] The inner side of the C-shaped strip 12 has an arc-shaped groove structure. The elliptical camshaft 4 is placed in the arc-shaped groove structure to cooperate with the U-shaped pressure strip 10. Rotating the camshaft 4 clockwise or counterclockwise by 90° will lock or release the scraper 3 using the U-shaped pressure strip 10.

[0039] 1) Scraper 3 in locked state, as Figure 4-5 As shown, at this time, the long shaft of the camshaft 4 abuts against the C-shaped strip 12, applying a rightward thrust to the U-shaped pressure strip 10 and thus pressing the scraper 3.

[0040] 2) When scraper 3 is in the loose state, as Figure 6-7 As shown, at this time, the camshaft 4 no longer applies force to the C-shaped strip 12, causing the U-shaped pressure strip 10 to loosen the scraper 3.

[0041] After the camshaft 4 rotates to loosen the U-shaped pressure strip 10, the scraper 3 can be removed from the scraper body 1, making subsequent cleaning work easier.

[0042] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A doctor blade positioning quick-lock device for a printing press, the printing press comprising a doctor blade body (1) and an anilox roller (2), wherein a doctor blade (3) is provided between the doctor blade body (1) and the anilox roller (2) on the same side at both ends of the doctor blade body (1), characterized in that, The scraper positioning quick-lock device includes two U-shaped pressure strips (10) that are detachably installed at the upper and lower ends of the scraper body (1). The U-shaped pressure strips (10) are fastened to the scraper body (1) and the two sides are located on the left and right sides of the scraper body (1). The side of the U-shaped pressure strip (10) closest to the scraper (3) is a flat pressure plate (11) that acts on the outer surface of the scraper (3) and presses it onto the scraper body (1). The second side of the U-shaped pressure strip (10) is provided with a C-shaped strip (12). The lower half of the flat plate (11) is used to press the scraper (3), and the upper half of the flat plate (11) is in contact with the scraper body (1). The inner side of the upper half of the flat plate (11) and the scraper body (1) are respectively provided with L-shaped positioning protrusions (13) and positioning grooves (6). The scraper body (1) has cavities (5) at both the upper and lower ends for accommodating the C-shaped strip (12). A camshaft (4) is rotatably installed inside the cavity (5) and located in the opening of the C-shaped strip (12). By rotating the camshaft (4), the C-shaped strip (12) is acted upon, so that the flat pressing plate (11) presses or releases the scraper (3).

2. The doctor blade positioning quick-lock device for a printing press as described in claim 1, characterized in that, The L-shaped positioning protrusion (13) has a planar structure on the side near the scraper (3) and a semi-circular structure on the side away from the scraper (3).

3. The doctor blade positioning quick-lock device for a printing press as described in claim 1, characterized in that, The camshaft (4) is an elliptical axis.

4. The doctor blade positioning quick-lock device for a printing press as described in claim 3, characterized in that, The camshaft (4) has an operating handle interface on one side.

5. The doctor blade positioning quick-lock device for a printing press as described in claim 3, characterized in that, The scraper body (1) is provided with a limiting mechanism for limiting the rotation angle of the camshaft (4).

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