A device for preventing curling

Abstract

The utility model relates to offset printing technical field, and disclose a kind of anti-curling offset printing device, including mounting bracket, two guide rollers on mounting bracket between support frame and offset printing machine paper distribution presents oblique inverted Z shape;Base on mounting bracket is provided with reciprocating assembly and adjusting assembly;Through the rotation of C-shaped communication pipe in adjusting assembly in sliding seat, can accurately adjust the inclination angle of spray head relative to horizontal line and paper, make spray angle flexible adjustable, adapt different paper humidification needs;Through the sliding sleeve in reciprocating assembly cooperation reciprocating screw rod drive sliding seat, and the clearance of connecting plate and peg head is contacted and cooperated, drive spray head to carry out small angle circumferential reciprocating rotation while sliding horizontally to reach double reciprocating motion superposition, realize paper width direction full coverage and humidification uniformity;Through oblique inverted Z shape paper support setting, guarantee humidification and transmission stability, effectively solve the curling problem caused by paper drying or humidity uneven, guarantee the finished product quality of paper printing.

Description

Technical Field

[0001] This utility model relates to the field of offset printing technology, specifically to an anti-curling offset printing device. Background Technology

[0002] Offset printing is a type of planographic printing press. During printing, the image is first printed onto a rubber roller from a printing plate, and then transferred from the rubber roller to the paper. Sheet-fed offset printing presses are planographic printing presses used for printing high-end commercial printed materials and packaging printed materials, and are the mainstream of modern paper printing.

[0003] Patent CN218366892U discloses an anti-curling offset printing device. It uses an electric telescopic rod to move a pressure plate along a guide limit rod, pressing the paper body down onto a bottom support body. This pressure plate and bottom support body prevent the paper from curling. However, this mechanical, rigid anti-curling method results in excessive friction between the pressure plate and the paper. Furthermore, a significant factor causing paper curling is abnormal moisture content due to a dry environment. Low moisture content leads to edge drying and shrinkage, both of which easily cause curling. Using a pressure plate to press down on the paper body exacerbates tearing and damage.

[0004] Therefore, we provide an anti-curling offset printing device to solve the above problems. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an anti-curling offset printing device, which has the advantages of adjustable paper humidification angle and uniform coverage, and solves the problem of paper curling easily due to low moisture content.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: An anti-curling offset printing device includes an offset printing machine for printing paper on a printing support frame, wherein an anti-curling humidifying mechanism for humidifying the paper is provided between the support frame and the offset printing machine. The anti-rolling and humidifying mechanism includes a mounting frame, and two guide rollers on the mounting frame distribute the paper between the support frame and the offset printing machine in an oblique inverted Z-shape. The mounting frame is connected to a base located above the paper. The base is equipped with a reciprocating assembly and an adjusting assembly. The reciprocating assembly includes a slide that slides back and forth on the base. A connecting pipe is rotatably connected to the slide, and multiple spray heads for humidifying the paper are rotatably connected to the connecting pipe. The adjusting assembly includes a functional frame fixed to the base. The functional frame is provided with an arc-shaped hole, and the arc-shaped hole is fitted with a connecting plate that drives the multiple spray heads to rotate on the connecting pipe.

[0007] Preferably, the reciprocating assembly further includes a mounting plate and a servo geared motor mounted on one end of the base. The mounting plate is rotatably connected to a reciprocating lead screw connected to the output shaft of the servo geared motor. A sliding sleeve that is slidably connected to the base is fitted on the reciprocating lead screw. A connecting rod connects the sliding sleeve and the sliding base.

[0008] Preferably, the adjusting assembly further includes adjusting teeth fixedly installed on the connecting pipe, and locking teeth that cooperate with the adjusting teeth are rotatably connected to the slide.

[0009] Preferably, one end of the connecting plate is threaded with a locking bolt, the unthreaded bolt rod section of the locking bolt is slidably connected to the arc-shaped hole of the functional frame, and the bolt head and the side wall of the connecting plate respectively mate with the two side walls of the arc-shaped hole.

[0010] Preferably, the lower end of the connecting plate is provided with multiple insert rods at equal intervals, each spray head is provided with a retainer, the retainer is detachable and detachable with a retainer sleeve, the retainer sleeve is provided with an insertion hole, and the connecting plate is seated on the insertion hole on the retainer sleeve by the multiple insert rods.

[0011] Preferably, a sealed bearing is connected between the connecting pipe and the spray head, and a spring tube is connected between the connecting pipe and the functional frame, with multiple spray heads distributed at equal intervals on the connecting pipe.

[0012] Preferably, the slide has a C-shaped groove, and the connecting pipe is C-shaped.

[0013] Preferably, the center of the arc-shaped hole is concentric with the center of the connecting pipe.

[0014] Preferably, a connecting frame is provided between the base and the mounting frame, and the inclined support portion of the mounting frame has a rotating hole that is rotatably connected to the guide roller.

[0015] Preferably, the nozzle of the spray head is angled upward relative to the horizontal line.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides an anti-curling offset printing device, which has the following beneficial effects: The specific technical effects are as follows: 1. The adjustable components allow for flexible adjustment of the spray head's spray angle to suit different paper humidification needs. The meshing of locking and adjusting teeth drives the C-shaped connecting tube to rotate within the slide, precisely adjusting the spray head's tilt angle relative to the horizontal line and the paper. This feature allows for flexible switching of the spray direction based on paper material (e.g., thick or thin paper), moisture content differences, or humidification requirements, avoiding localized over-humidification or under-humidification issues caused by a fixed angle. This improves the targeted humidification of the paper and effectively solves the problem of edge curling caused by uneven drying or humidity by balancing the paper's moisture content, ensuring the quality of printed products.

[0017] 2. By using a reciprocating assembly, the spray head achieves a double reciprocating motion superposition effect, eliminating the need for densely arranged spray heads. This achieves full coverage humidification across the width of the paper and ensures uniform humidification. Wide lateral coverage: A servo-driven geared motor rotates the reciprocating screw, causing the slide and spray head to slide back and forth along the width of the paper. This ensures the spray covers the entire width of the paper, avoiding edge omissions and uneven humidification caused by fixed spraying in certain areas. Small circumferential angle fine adjustment: The connecting plate engages with the sidewalls of the bolt head and the arc-shaped hole, causing the spray head to rotate in a small-angle circular motion while sliding laterally. This creates a dynamic fan-shaped spray trajectory, avoiding the limitations of traditional single-direction spraying. This results in more even moisture distribution on the paper surface, reducing printing variations caused by localized moisture content differences.

[0018] 3. The inclined Z-shaped paper support ensures the stability of humidification and transfer. Two guide rollers support the paper in an inclined Z-shape, which on the one hand can suppress paper curling and wrinkling through bidirectional tension, providing a flat working surface for spray humidification; on the other hand, it extends the residence time of the paper in the humidification area, allowing the moisture to penetrate more fully and improving the humidification effect. At the same time, the stable transfer shape can match the paper feeding rhythm of the subsequent offset printing machine, ensuring the continuity of the production process. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is the front view of the present invention.

[0021] Figure 3 This is a top view of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the guide roller and paper in this utility model.

[0023] Figure 5 This is a schematic diagram of the anti-winding and humidifying mechanism of this utility model.

[0024] Figure 6This is an exploded view of the anti-winding and humidifying mechanism of this utility model.

[0025] Figure 7 for Figure 6 Enlarged view of a local structure.

[0026] Figure 8 This is a schematic diagram of the reciprocating component structure of this utility model.

[0027] Figure 9 This is a schematic diagram of the adjustment component structure of this utility model.

[0028] In the picture: 1. Offset printing machine; 2. Anti-winding and humidifying mechanism; 201. Mounting frame; 202. Diagonal brace; 203. Rotary hole; 204. Guide roller; 205. Connecting frame; 206. Base; 207. Slide; 2071. Locking tooth; 208. Connecting pipe; 2081. Adjusting tooth; 2082. Sealed bearing; 209. Spring tube; 21. Reciprocating assembly; 211. Mounting plate; 212. Reciprocating lead screw; 213. Sliding sleeve; 214. Connecting rod; 215. Servo geared motor; 22. Adjustment component; 221. Functional frame; 222. Arc-shaped hole; 223. Connecting plate; 224. Locking bolt; 225. Bolt head; 226. Insert rod; 227. Sleeve; 23. Spray nozzle; 231. Card holder; 3. Support frame; 4. Paper. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] This embodiment provides an anti-curling offset printing device, which has the following technical features.

[0034] Please see Figures 1 to 9 , An anti-curling offset printing device includes an offset printing machine 1 for printing paper 4 on a printing support frame 3, and an anti-curling humidifying mechanism 2 for humidifying the paper 4 is provided between the support frame 3 and the offset printing machine 1. The anti-rolling and humidifying mechanism 2 includes a mounting frame 201, and two guide rollers 204 on the mounting frame 201 distribute the paper 4 between the support frame 3 and the offset printing machine 1 in an oblique inverted Z-shape. The mounting bracket 201 is connected to a base 206 located above the paper 4. The base 206 is provided with a reciprocating component 21 and an adjusting component 22. The reciprocating component 21 includes a slide 207 that slides back and forth on the base 206. A connecting pipe 208 is rotatably connected to the slide 207. Multiple spray heads 23 for humidifying the paper 4 are rotatably connected to the connecting pipe 208. The adjusting component 22 includes a functional frame 221 fixed on the base 206. The functional frame 221 is provided with an arc-shaped hole 222. The arc-shaped hole 222 is matched with a connecting plate 223 that drives the multiple spray heads 23 to rotate on the connecting pipe 208.

[0035] It should be noted that the inclined Z-shaped paper 4 is used to support the paper, ensuring the stability of humidification and transfer. The two guide rollers 204 support the paper 4 in an inclined Z-shape, which on the one hand can suppress the curling and wrinkling of the paper 4 through bidirectional tension, providing a flat working surface for spray humidification; on the other hand, it extends the residence time of the paper 4 in the humidification area, allowing the moisture to penetrate more fully and improving the humidification effect. At the same time, the stable transfer shape can match the paper feeding rhythm of the subsequent offset printing machine 1, ensuring the continuity of the production process.

[0036] See Figures 5 to 9The reciprocating assembly 21 also includes a mounting plate 211 and a servo geared motor 215 mounted on one end of the base 206. The mounting plate 211 is rotatably connected to a reciprocating lead screw 212 connected to the output shaft of the servo geared motor 215. A sliding sleeve 213 is fitted on the reciprocating lead screw 212 and slidably connected to the base 206. A connecting rod 214 is connected between the sliding sleeve 213 and the slide seat 207. Multiple insertion rods 226 are evenly spaced at the lower end of the connecting plate 223. Each spray head 23 is provided with a retainer 231. A retainer 227 is installed on the retainer 231. An insertion hole is provided on the retainer 227. The connecting plate 223 sits on the insertion hole on the retainer 227 through the multiple insertion rods 226. A sealed bearing 2082 is connected between the connecting pipe 208 and the spray head 23. A spring tube 209 is connected between the connecting pipe 208 and the functional frame 221. Multiple spray heads 23 are evenly distributed on the connecting pipe 208.

[0037] It should be noted that: through the reciprocating component 21, the spray head 23 achieves a double reciprocating motion superposition effect, realizing full coverage humidification and uniform humidification in the width direction of the paper 4; wide lateral coverage: the servo reduction motor 215 drives the reciprocating screw 212 to rotate, causing the slide 207 and spray head 23 to slide back and forth along the width direction of the paper 4, ensuring that the spray can cover the entire width of the paper 4, avoiding the problems of edge omission and uneven humidification caused by fixed spraying of the paper 4 in traditional fixed spraying; small circumferential angle fine adjustment: the connecting plate 223 abuts against the gap of the hole sidewall of the bolt head 225 and the arc hole 222, causing the spray head 23 to perform small circumferential reciprocating rotation while sliding laterally, making the spray trajectory a dynamic fan shape, avoiding the limitations of traditional single-direction spraying, making the moisture more evenly distributed on the surface of the paper 4, and reducing the printing differences on the paper 4 caused by local moisture content differences.

[0038] See Figure 2 and Figures 5 to 9 The adjustment assembly 22 also includes an adjustment tooth 2081 fixedly installed on the connecting pipe 208. A locking tooth 2071 that cooperates with the adjustment tooth 2081 is rotatably connected to the slide 207. A locking bolt 224 is threadedly connected to one end of the connecting plate 223. The unthreaded bolt rod section of the locking bolt 224 is slidably connected to the arc-shaped hole 222 of the functional frame 221. The bolt head 225 of the locking bolt 224 and the side wall of the connecting plate 223 respectively cooperate with the two side walls of the arc-shaped hole 222. A C-shaped groove is provided on the slide 207. The connecting pipe 208 is C-shaped. The center of the arc-shaped hole 222 is concentric with the center of the connecting pipe 208. A connecting frame 205 is connected between the base 206 and the mounting frame 201. The inclined support part 202 of the mounting frame 201 is provided with a rotating hole 203 that is rotatably connected to the guide roller 204. The nozzle of the spray head 23 is obliquely upward relative to the horizontal line.

[0039] It should be noted that the nozzle of the spray head 23 is angled upward relative to the horizontal line. When the printing of paper 4 is stopped, the upward-angled nozzle can effectively prevent small water droplets from falling onto paper 4. The spray angle of the spray head 23 can be flexibly adjusted by the adjustment component 22 to adapt to the humidification needs of different papers 4. The C-shaped connecting tube 208 rotates within the slide 207 through the meshing transmission of the locking tooth 2071 and the adjusting tooth 2081, which can precisely adjust the tilt angle of the spray head 23 relative to the horizontal line and paper 4. This setting can flexibly switch the spray direction according to the material of paper 4 (such as thick paper, thin paper), moisture content difference or humidification needs, avoiding the problem of local over-humidification or lack of humidification caused by a fixed angle, improving the targeted humidification of paper 4, and effectively solving the problem of edge curling caused by uneven drying or humidity of paper 4 by balancing the moisture content of paper 4, thus ensuring the quality of the printed product of paper 4.

[0040] Working principle: By rotating the locking tooth 2071 in conjunction with the adjusting tooth 2081, the C-shaped connecting tube 208 rotates in the C-shaped groove of the slide 207, thereby adjusting the tilt angle of the spray head 23 relative to the horizontal line and the corresponding paper 4. The servo reducer motor 215 is started by the controller. The output shaft of the servo reducer motor 215 drives the reciprocating screw 212 to rotate, so that the sliding sleeve 213 drives the sliding block 207 to reciprocate on the base 206 through the connecting rod 214, thereby causing the spray head 23 on the connecting pipe 208 to perform reciprocating spray treatment in the width direction of the paper 4. At the same time, the connecting plate 223 and the plug head 225 abut against the two side walls of the arc-shaped hole 222, so that the insertion rod 226 of the connecting plate 223 drives the spray head 23 on the card seat 231 to reciprocate at a small angle on the connecting pipe 208 through the card sleeve 227. This allows the spray head 23 to spray in a reciprocating motion in the width direction of the paper 4, while also spraying the paper 4 in a circular reciprocating rotation.

[0041] In summary, this anti-curling offset printing device achieves a triple improvement in spray accuracy, coverage uniformity, and paper 4 compatibility by adjusting the spray head 23 in multiple dimensions and optimizing the paper 4 shape.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-curling offset printing apparatus, comprising an offset printing machine (1) for printing paper (4) on a printing support frame (3), characterized in that, An anti-rolling humidification mechanism (2) for humidifying the paper (4) is provided between the support frame (3) and the offset printing machine (1). The anti-rolling and humidifying mechanism (2) includes a mounting frame (201), and two guide rollers (204) on the mounting frame (201) distribute the paper (4) between the support frame (3) and the offset printing machine (1) in an oblique inverted Z shape; The mounting bracket (201) is connected to a base (206) located above the paper (4). The base (206) is provided with a reciprocating component (21) and an adjusting component (22). The reciprocating component (21) includes a slide (207) that slides back and forth on the base (206). A connecting pipe (208) is rotatably connected to the slide (207). Multiple spray heads (23) for humidifying the paper (4) are rotatably connected to the connecting pipe (208). The adjusting component (22) includes a functional frame (221) fixed on the base (206). An arc-shaped hole (222) is provided on the functional frame (221). The arc-shaped hole (222) is matched with a connecting plate (223) that drives the multiple spray heads (23) to rotate on the connecting pipe (208).

2. The anti-curling offset printing device according to claim 1, characterized in that, The reciprocating assembly (21) also includes a mounting plate (211) and a servo geared motor (215) mounted on one end of the base (206). The mounting plate (211) is rotatably connected to a reciprocating lead screw (212) connected to the output shaft of the servo geared motor (215). A sliding sleeve (213) is fitted on the reciprocating lead screw (212) and slidably connected to the base (206). A connecting rod (214) is connected between the sliding sleeve (213) and the slide (207).

3. The anti-curling offset printing device according to claim 1, characterized in that, The adjustment assembly (22) also includes an adjustment tooth (2081) fixedly installed on the connecting pipe (208), and a locking tooth (2071) that cooperates with the adjustment tooth (2081) is rotatably connected to the slide (207).

4. The anti-curling offset printing device according to claim 1, characterized in that, One end of the connecting plate (223) is threaded with a bolt (224). The unthreaded bolt rod section of the bolt (224) is slidably connected to the arc-shaped hole (222) of the functional frame (221). The bolt head (225) of the bolt (224) and the side wall of the connecting plate (223) respectively cooperate with the two side walls of the arc-shaped hole (222).

5. The anti-curling offset printing device according to claim 1, characterized in that, The lower end of the connecting plate (223) is provided with a plurality of insert rods (226) at equal intervals. Each spray head (23) is provided with a card holder (231). The card holder (231) is equipped with a card sleeve (227). The card sleeve (227) is provided with a socket. The connecting plate (223) sits on the socket on the card sleeve (227) through the plurality of insert rods (226).

6. The anti-curling offset printing device according to claim 1, characterized in that, A sealed bearing (2082) is connected between the connecting pipe (208) and the spray head (23), and a spring tube (209) is connected between the connecting pipe (208) and the functional frame (221). The multiple spray heads (23) are distributed at equal intervals on the connecting pipe (208).

7. The anti-curling offset printing device according to claim 1, characterized in that, The slide (207) has a C-shaped groove, and the connecting pipe (208) is C-shaped.

8. The anti-curling offset printing device according to claim 7, characterized in that, The center of the arc-shaped hole (222) is concentric with the center of the connecting pipe (208).

9. The anti-curling offset printing device according to claim 1, characterized in that, A connecting frame (205) is connected between the base (206) and the mounting frame (201). The inclined support (202) of the mounting frame (201) has a rotating hole (203) that is rotatably connected to the guide roller (204).

10. The anti-curling offset printing device according to claim 1, characterized in that, The nozzle of the spray head (23) is set at an angle upward relative to the horizontal line.

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