CN114103429A - Paper flattening mechanism of printing machine - Google Patents
Paper flattening mechanism of printing machine Download PDFInfo
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- CN114103429A CN114103429A CN202010869606.4A CN202010869606A CN114103429A CN 114103429 A CN114103429 A CN 114103429A CN 202010869606 A CN202010869606 A CN 202010869606A CN 114103429 A CN114103429 A CN 114103429A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
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Abstract
The disclosure relates to the technical field of printing equipment, in particular to a paper flattening mechanism of a printing machine. The printing machine paper flattening mechanism that this disclosure provided includes: the impression cylinder is arranged inside the shell; the flattening device is arranged in the shell and is opposite to the impression cylinder; the flattening device comprises a plurality of nozzles which are arranged at intervals along the axial direction of the impression cylinder; the nozzles are used for forming fan-shaped air flows facing the impression cylinder, the fan-shaped air flows formed by the nozzles are positioned on the same plane, and the fan-shaped air flows form continuous straight lines on the impression cylinder, and the straight lines are parallel to the axis of the impression cylinder.
Description
Technical Field
The disclosure relates to the technical field of printing equipment, in particular to a paper flattening mechanism of a printing machine.
Background
The traditional offset printing machine is widely used in China, relates to a plurality of industries such as food, medicine, cosmetics, cigarette packets, electronic packaging and the like, and has become a genuine printing industry large country in China.
With the development of the printing machine inspection industry, the online real-time monitoring of the quality of the printing process by additionally arranging an online detection system on a printing machine is a trend of the development of the printing machine inspection industry. The online detection system is additionally arranged on the printing machine, each piece of paper in the printing process is subjected to image acquisition in real time through a line scanning camera imaging system, then the image is analyzed and detected through software, and the consistency and stability of the image are the keys of success and failure of the detection system. Therefore, in order to ensure the consistency and stability of each image acquisition, it is important to control the smoothness of the paper printing motion process, namely the paper flattening technology in the industry.
In the prior art, the blowing physical flattening is usually adopted, and because the roller is circular and has curvature, paper is ensured to be always attached to the roller in the drawing process, so that high requirements on the size and stability of wind pressure are met. At present, in a traditional mode, in order to ensure sufficient air pressure, a high-power vortex air pump is adopted for pressure-building air supply, the air flow output by the air pump is easy to age (temperature rises) along with voltage fluctuation, the air pump is easy to age, the air flow output by the air pump has a play condition, energy is wasted, the actual flattening effect is large in fluctuation, and the air pump can be continuously used in occasions with low requirements.
The thickness degree of the printed paper can be adjusted by the air quantity of the same equipment, and the common mode is realized by adopting a frequency converter to control the rotating speed of a motor. When the gram weight of the paper is large, the air flow sprayed by the common nozzle has enough area and striking force, and the requirement of flattening can be basically met; when the gram weight of the paper is small, particularly the paper with the weight of less than 70 grams, the nozzles cannot be arranged in a high density, so that breakpoints and disturbance exist among the ejected air flows, the paper is easy to wrinkle, a large amount of image deformation and misinformation are caused, and the use of the system is influenced.
Disclosure of Invention
To solve the technical problem or at least partially solve the technical problem, the present disclosure provides a paper flattening mechanism for a printing press.
The printing machine paper flattening mechanism that this disclosure provided includes:
the impression cylinder is arranged inside the shell;
the flattening device is arranged in the shell and is opposite to the impression cylinder;
the flattening device comprises a plurality of nozzles which are arranged at intervals along the axial direction of the impression cylinder;
the nozzles are used for forming fan-shaped air flows facing the impression cylinder, the fan-shaped air flows formed by the nozzles are positioned on the same plane, and the fan-shaped air flows form continuous straight lines on the impression cylinder, and the straight lines are parallel to the axis of the impression cylinder.
In one possible design, the flattening apparatus further includes:
the nozzles are uniformly arranged on the blowing cavity;
and the air transmission port is communicated with the blowing cavity through a control pipeline, and the control pipeline is sequentially provided with an electromagnetic valve and a pressure reducing valve.
In one possible design, the nozzle includes an inlet end, a feed gas channel, and an outlet end;
and the air outlet end is provided with a V-shaped groove gradually expanding towards the air outlet end by taking the air supply channel as a vertex along the direction from the air inlet end to the air outlet end.
In one possible design, a first air inlet and a second air inlet are respectively arranged at two ends of the blowing cavity;
the control pipeline comprises an air inlet, a first air outlet and a second air outlet, the air inlet is communicated with the air transmission port, the first air outlet is communicated with the first air inlet, and the second air outlet is communicated with the second air inlet.
In one possible design, the inner cross sections of the first air inlet and the second air inlet are the same in area;
the areas of the inner sections of the first air outlet and the second air outlet are the same.
In a possible design, the blowing chamber extends in the direction of the axis of the impression cylinder;
along the direction perpendicular to the axis of the impression cylinder, the inner section of the blowing cavity is circular, and the areas of the inner sections are the same.
In one possible design, the impression cylinder further comprises an image acquisition mechanism, the image acquisition mechanism is arranged on the shell, an acquisition line of the image acquisition mechanism extends towards the axis of the impression cylinder, and an acquisition part is formed on the impression cylinder;
the included angle alpha between the blowing direction of the nozzle and the extending direction of the image acquisition line meets the following requirements: alpha is more than or equal to 0 and less than or equal to 20 degrees.
In one possible design, the spreader is located downstream of the collector in the sheet transport direction.
In one possible embodiment, the blowing direction includes an angle β with the tangential direction of the collecting section that satisfies: beta is more than or equal to 70 degrees and less than or equal to 90 degrees.
In one possible embodiment, the line of extension of the blowing direction intersects the axis of the impression cylinder.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the nozzles in the paper flattening mechanism of the printing machine can form fan-shaped air flows facing the impression cylinder, the fan-shaped air flows formed by the nozzles are located on the same plane, and the fan-shaped air flows form continuous straight lines on the impression cylinder, and the straight lines are parallel to the axis of the impression cylinder. When the high-pressure air flow is sprayed out of the nozzle, the air flow presents a linear fan-shaped spraying angle, a linear air knife is formed to act on the paper, and the paper is flattened to the maximum extent. Because the straight line is continuous and the paper is blown at a reverse large angle, the paper can be uniformly acted backwards no matter the paper is thin paper or thick paper, and the possibility of wrinkling and curling of the paper is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a partial schematic structural view of a paper flattening mechanism of a printing press according to an embodiment of the disclosure;
FIG. 2 is an enlarged view of a portion of the structure shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a flattening device according to an embodiment of the disclosure;
FIG. 4 is a schematic structural view of a nozzle according to an embodiment of the present disclosure;
fig. 5 is a schematic view of the air flow from the nozzle.
Reference numerals:
1-an impression cylinder;
2-a flattening device;
21-a blowing cavity;
211-a first air inlet;
212-a second air inlet;
22-gas supply means;
221-gas transmission port;
23-a nozzle;
231-an air inlet end;
232-gas channel;
233-air outlet end;
24-a control line;
241-an air inlet;
242 — a first air outlet;
243-a second air outlet;
245-a pressure reducing valve;
246-solenoid valve;
3-an image acquisition mechanism;
31-a scaffold;
32-a collection device;
4-air blowing direction;
5-collecting line;
6-a collecting part;
7-paper;
8-a light source;
9-a housing;
91-a plate cylinder;
92-chain path roller.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
FIG. 1 is a partial schematic structural view of a paper flattening mechanism of a printing press according to an embodiment of the disclosure; FIG. 2 is an enlarged view of a portion of the structure shown in FIG. 1; FIG. 3 is a schematic structural diagram of a flattening device according to an embodiment of the disclosure; FIG. 4 is a schematic structural view of a nozzle according to an embodiment of the present disclosure; fig. 5 is a schematic view of the air flow from the nozzle.
As shown in fig. 1 and 2, the present disclosure provides a printing press paper flattening mechanism including: impression cylinder 1 and flattening device 2, impression cylinder 1 and flattening device 2 all set up in the inside of shell 9, and shell 9 is the major structure of whole printing machine, and shell 9 can be used for installing other spare parts, also can provide the guard action to the part of its inside installation. The impression cylinder 1 is a core component for implementing a printing press, i.e. for transferring the image-text information on the printing plate to the printing sheet, and the delivery cylinder is used for delivering the printed printing sheet.
The paper flattening mechanism of the printing press further comprises a plate cylinder 91 and a chain path cylinder 92, wherein the plate cylinder 91 is provided with image-text information and is used for transferring ink, and the chain path cylinder 92 is used for outputting the paper 7.
The flattening device 2 and the impression cylinder 1 are arranged oppositely, and the paper flattening mechanism of the printing machine provided by the embodiment adopts the flattening device 2 to flatten the paper 7, so that the installation and use space requirement is low, the safety is good, and the popularization and the promotion are facilitated. The spreader 2 may act on the impression cylinder 1 at the acquisition portion 6 to ensure the smoothness of the sheet 7 as the sheet 7 passes through the region.
Generally, opposite sides of the circumferential direction of the impression cylinder 1 in the direction of transfer of the sheet 7 may form a sheet-in side and a sheet-out side, and the sheet 7 is fed in from the sheet-in side of the impression cylinder 1 and is discharged from the sheet-out side of the impression cylinder 1 after the transfer is completed. The flattening device 2 is disposed between the paper inlet side and the paper outlet side because of a certain distance therebetween.
As shown in fig. 3, the flattening apparatus 2 further includes: the blowing cavity 21 and the air supply device 22 are arranged on the blowing cavity 21 uniformly, the structure and the construction are simple, the assembly parts are standard parts, and batch manufacturing can be facilitated. The air supply device 22 can be a centralized air supply device 22 or an industrial air compressor. The air delivery port 221 of the air supply device 22 is communicated with the blowing cavity 21 through a control pipeline 24, and an electromagnetic valve 246 and a pressure reducing valve 245 are sequentially arranged on the control pipeline 24.
According to specific paper 7 grammes per square metre, can select to use centralized gas supply or industry air compressor machine independent air feed: when the weight of the paper is less than 150g, centralized air supply can be preferentially adopted, the requirements on the pressure and the flow of an air source are lower, and the self-use high-pressure air in a common factory can completely meet the requirements. When the 7 gram weight of paper is greater than 150g, mostly card paper class, the requirement to the air supply is higher this moment, if the concentrated air feed air supply that the mill provided can not satisfy the requirement, can select to use the screw compressor machine of sufficient power to carry out independent air feed. Specifically, the air source mode can be flexibly selected according to the situation of the use occasion of the equipment. The two air supply modes are reasonably selected, the air source problem of 40g-400g of paper 7 can be achieved together, the noise is low, the energy efficiency ratio is high, the air supply device works along with the paper flattening mechanism of the printing machine, and the energy waste is reduced.
An electromagnetic valve 246 is arranged at the outlet of the air source, namely the electromagnetic valve 246 is arranged on the control pipeline 24 connected with the air transmission port 221, so that the output of the air source can be closed in the non-production stage, and the aim of saving energy is fulfilled. The pressure reducing valve 245 is provided with a pressure gauge, the pressure gauge is used for adjusting the pressure of the output air flow, and through practice, relatively fixed pressure parameters can be formed corresponding to the paper 7 with different gram weights, so that the adjustment at each time is convenient. The electromagnetic valve 246 is introduced for control, so that the production can be bound with the machine table, and the energy-saving purpose is achieved; by introducing the control of the pressure reducing valve 245, the flattening effect can be adjusted correspondingly according to the product type, and the optimal flattening effect is achieved.
The flattening device 2 includes a plurality of nozzles 23, and the nozzles 23 blow air to the paper 7 to apply pressure to the paper 7 on the impression cylinder 1, so that the paper 7 is attached to the surface of the impression cylinder 1 to be flattened.
A plurality of nozzles 23 are arranged at intervals along the axial direction of the impression cylinder 1, the nozzles 23 are used for forming fan-shaped air flows facing the impression cylinder 1, and the fan-shaped air flows formed by the nozzles 23 are positioned on the same plane, so that the fan-shaped air flows form continuous air flows. The fan-shaped air flows form continuous straight lines on the impression cylinder 1, the straight lines are parallel to the axis of the impression cylinder 1, and the fan-shaped air flows form a linear air knife to act on the paper 7, so that the paper 7 is flattened to the maximum extent. Since the air flow over the impression cylinder 1 is continuous, there is a uniform force applied backwards on the paper 7, whether thin or thick, reducing the likelihood of the paper 7 wrinkling and curling. Meanwhile, since the flattening device 2 is not in contact with the impression cylinder, the printed paper 7 is reliably stuck to the outer wall of the impression cylinder 1 to be flattened, preventing the printed paper 7 from being scraped.
As shown in fig. 5, when the high-pressure air flow is ejected from the nozzle 23, a "straight" fan-shaped ejection angle is presented, and the "straight" can be overlapped and connected through reasonable selection of the working distance and the arrangement of the density of the nozzle 23, and finally a linear air knife is formed to act on the paper 7, so that the paper 7 is flattened to the maximum extent. Since the straight line is continuous and the paper 7 is blown at a reverse large angle, even force can be applied to the paper in a backward direction no matter the paper is thin paper or thick paper, and the possibility of wrinkling and curling of the paper 7 is reduced. When using the central gas supply, all devices all belong to non-maintaining device, but long-term normal use, when using the air compressor machine, need follow the maintenance requirement of air compressor machine, approximately half a year once carries out the change of inside machine oil to equipment normal work, the fault point is few, and it is simple to maintain, long service life. Therefore, in a normal situation, a machine user only needs to properly adjust the output of the pressure reducing valve 245 according to the gram weight of the printed product, so as to ensure the detection capability of the whole online detection system.
The width of the airflow on the impression cylinder 1 is larger than the width of the two opposite axial sides of the impression cylinder 1, so that the flattening device 2 can uniformly apply acting force on the paper 7 in the width direction, and the flattening effect is more remarkable.
Optionally, the plurality of nozzles 23 are evenly spaced along the axial direction of the impression cylinder 1 to ensure that the pressure of the air stream ejected from each nozzle 23 is consistent, and to provide an even backward force on the paper 7, thereby reducing the possibility of wrinkling and curling of the paper 7. Optionally, the interval between two adjacent nozzles 23 is 40mm to 60mm, and preferably, the interval between two adjacent nozzles 23 is 60mm, so as to ensure that the pressure of the air flow ejected from each nozzle 23 is consistent, and reduce the possibility of wrinkles and curls of the paper 7.
The distance between the air outlet 233 of the nozzle 23 on the blowing cavity 21 and the paper 7 needs to be matched with the blowing amount to achieve the optimal flattening effect. Optionally, the distance between the air outlet end 233 of the nozzle 23 and the paper 7 is 40mm to 60mm, so as to ensure that the pressure of the air flow ejected from each nozzle 23 is consistent, provide a uniform backward acting force on the paper 7, and reduce the possibility of wrinkling and curling of the paper 7. Preferably, the distance from the air outlet end 233 of the nozzle 23 to the paper 7 is 50 mm. Through reasonable selection of working distance and arrangement of the density of the nozzles 23, the air flow can be overlapped and connected in a straight shape, and finally a linear air knife is formed to act on the printed matter, so that the printed matter is flattened to the maximum extent.
The length of each nozzle 23 extending into the blowing cavity 21 is consistent, so that the air pressure in the blowing cavity 21 is stable, the pressure of the air flow sprayed by each nozzle 23 is consistent, and the possibility of wrinkling and curling of the paper 7 is reduced.
As shown in fig. 4, the nozzle 23 includes an air inlet 231, an air supply channel 232 and an air outlet 233, the air outlet 233 is provided with a V-shaped groove gradually expanding toward the air outlet 233 with the air supply channel 232 as a vertex along a direction from the air inlet 231 to the air outlet 233, so that the nozzle 23 can generate fan-shaped air flow, an included angle between two sides of the V-shaped groove is 20 to 60 degrees, a plurality of fan-shaped air flows can be overlapped and connected in a word, and finally a linear air knife is formed to act on the printed matter. The air feed channel 232 comprises a first hole section, a second hole end and a third hole section which are coaxially arranged, the hole diameters of the first hole section, the second hole end and the third hole section are sequentially reduced, and the air flow in the air feed channel 232 can be accelerated. Air feed channel 232 still includes fourth hole section, fifth hole section and the sixth hole section of coaxial setting, and the aperture of fourth hole section, fifth hole section and sixth hole section increases in proper order, and the tip that end 233 of giving vent to anger becomes "V" shape groove sets up and communicates with the sixth hole section is coaxial, makes nozzle 23 can produce sectorial air current.
The air outlet end 233 of each nozzle 23 is maintained in a flat plane to ensure that the air flow is maintained in a horizontal line so that the force on the impression cylinder is the same for the fan-shaped air flow channel. The nozzles 23 are of the same construction to ensure wind consistency and reduce the likelihood of wrinkling and curling of the paper 7.
As shown in fig. 3, the two ends of the blowing cavity 21 are respectively provided with the first air inlet 211 and the second air inlet 212, and the blowing cavity 21 can make the air flow be more uniformly distributed on each nozzle 23 by air intake through the two ends, so as to ensure the pressure of each nozzle 23 to be consistent, and reduce the possibility of wrinkling and curling of the paper 7.
The control pipeline 24 includes an air inlet 241, a first air outlet 242 and a second air outlet 243, the air inlet 241 is communicated with the air transmission port 221, the first air outlet 242 is communicated with the first air inlet 211, and the second air outlet 243 is communicated with the second air inlet 212. The control pipeline 24 is provided with an air inlet 241, two air outlets, namely a first air outlet 242 and a second air outlet 243, which are communicated with the first air inlet 211 through the first air outlet 242, and the second air outlet 243 is communicated with the second air inlet 212, so that air is fed into two ends of the blowing cavity 21, air flow can be uniformly distributed on each nozzle 23, pressure in each nozzle 23 is ensured to be consistent, the force of the air sprayed by each nozzle 23 on the impression cylinder is the same, and the possibility of wrinkling and curling of the paper 7 is reduced.
The area of the inner section of the blowing cavity 21 is greater than or equal to the total area of the air outlet ends 233 of all the nozzles 23, so as to ensure the uniformity of the density of the air flow inside the blowing cavity 21 and the stability of the air pressure.
Optionally, the total area of the air outlet 233 of the nozzle 23 is 35mm2～45mm2Preferably, the total area of the air outlet 233 of the nozzle 23 is 40mm2。
In a specific embodiment, the areas of the inner cross sections of the first air inlet 211 and the second air inlet 212 are the same, and the areas of the inner cross sections of the first air outlet 242 and the second air outlet 243 are the same, so that the pressure or the flow rate of the air entering from both ends of the blowing cavity 21 can be the same, the air flow can be uniformly distributed on each nozzle 23, the pressure in each nozzle 23 can be uniform, the force of the air ejected from the nozzles 23 acting on the impression cylinder can be the same, and the possibility of wrinkles and curls of the paper 7 can be reduced.
In a specific embodiment, the blowing cavity 21 extends along the axial direction of the impression cylinder 1, the length change is flexible, the length of the blowing cavity 21 can be set according to the length of the impression cylinder 1, and the universality is high. Along the direction perpendicular to the axis of the impression cylinder 1, the inner section of the blowing cavity 21 is circular, and the areas of the inner sections are the same, so that the air flow can be uniformly distributed on each nozzle 23, and the pressure of each nozzle 23 is ensured to be consistent.
In a specific embodiment, the paper flattening mechanism of the printing machine further comprises an image acquisition mechanism 3, wherein the image acquisition mechanism 3 is installed on the shell 9, and the image acquisition mechanism 3 is positioned outside the internal space of the shell 9.
The pickup line 5 of the image pickup mechanism 3 extends toward the axis of the impression cylinder 1, and forms a pickup portion 6 at the impression cylinder 1. Specifically, the collecting section 6 on the impression cylinder 1 refers to an area on the paper 7 rolling-out side of the impression cylinder 1, that is, the collecting section 6 has printed paper already transferred, that is, an image to be collected exists, and the image collecting mechanism 3 can collect image information in the area. The collecting line 5 of the image collecting mechanism 3 refers to an optical path connecting line between a collecting element inside the image collecting mechanism 3 and a collecting area of the impression cylinder 1 when the image collecting mechanism 3 performs an image collecting function. In addition, in view of the normally dark inside the casing 9, in order to guarantee the proper functioning of the image acquisition mechanism 3, the aforementioned image acquisition mechanism 3 also comprises a light source 8, which light source 8 projects light onto the acquisition portion 6 on the impression cylinder 1, thereby illuminating the image inside the acquisition portion 6.
Since the image capturing mechanism 3 is installed outside the internal space of the housing 9, impurities such as dust inside the housing 9 do not easily contaminate the image capturing mechanism 3, and frequent maintenance of the image capturing mechanism 3 is not required. The maintenance frequency of the paper flattening mechanism of the printing machine is low. In addition, the printing machine paper flattening mechanism does not need to be internally provided with the image acquisition mechanism 3, so that the printing machine paper flattening mechanism does not need to be greatly changed; meanwhile, according to the printing machines with different specifications, different image acquisition mechanisms 3 can be flexibly replaced. In addition, the printing machine paper flattening mechanism is provided with the image acquisition mechanism 3 in a later-stage additional installation mode, and the influence on the daily production operation and maintenance of operators is avoided.
The image pickup mechanism 3 is installed outside the internal space of the housing 9, and the pickup portion 6 of the platen roller 1 is located in the internal space of the housing 9, so that the image pickup mechanism 3 and the platen roller 1 are configured to be separated by a part of the housing 9. When the casing 9 is made of a transparent material as a whole, even if a part of the structure of the casing 9 is blocked between the image capturing mechanism 3 and the impression cylinder 1, the image capturing operation of the image capturing mechanism 3 is not substantially affected, but if the casing 9 is made of a non-transparent material, the image capturing operation of the image capturing mechanism 3 is affected. In this case, a passage opening can be provided in the housing 9 through which the acquisition line 5 of the image acquisition device 3 can pass and extend to the acquisition region on the impression cylinder 1. Therefore, after the through hole is formed, the whole material and structure of the housing 9 are not limited, and the image acquisition quality of the image acquisition mechanism 3 can be ensured.
The image acquisition mechanism 3 comprises a bracket 31 and an acquisition device 32 hinged on the bracket 31,
the acquisition device 32 may be a camera. The bracket 31 is fixedly connected with the shell 9, and the collecting line 5 of the collecting device 32 forms an adjusting surface on the rotating stroke of the collecting device 32. That is, when the image capturing mechanism 3 is installed on printers of different specifications, the capturing device 32 may be rotated so that the capturing device 32 can adapt to the positions of the impression cylinders 1 of different specifications, and in the adjustment process, the capturing lines 5 of the capturing device 32 are constantly changed, and the capturing lines 5 at a plurality of positions may constitute the aforementioned adjustment surface. The structure can adjust the structure of the image acquisition mechanism 3 according to the specification change of the printing machine, so that the single image acquisition mechanism 3 has better universality.
The mounting height of the acquisition device 32 may be greater than the maximum height of the housing 9. That is, the collecting device 32 is located at a higher position after being mounted on the housing 9, and since most of impurities such as dust are gathered at a lower position, the amount of impurities around the collecting device 32 can be greatly reduced by mounting the collecting device 32, so that the collecting device 32 is better prevented from being polluted by the surrounding environment.
The angle alpha between the blowing direction 4 of the nozzle 23 and the extending direction of the image acquisition line 5 satisfies: alpha is more than or equal to 0 and less than or equal to 20 degrees, so that the acting force of the air flow on the paper 7 is larger, the requirement on the air source is reduced, after the air flow acts on the paper 7, the paper 7 can be uniformly acted backwards, the possibility of wrinkling and curling of the paper 7 is reduced, and the paper 7 of the collecting part 6 is better in flattening effect.
In a particular embodiment, the spreader 2 is located downstream of the acquisition portion 6 in the sheet transport direction. That is to say, compare with the position of collection portion 6 that image acquisition mechanism 3 is to, the position of exhibition paper machine 2 is located the low reaches of paper 7 direction of transfer, makes the air current can carry out reverse water conservancy diversion along the direction of paper 7 operation, can have an even effort to paper 7 backward, can realize that paper 7 flattens in the surface of impression cylinder 1, makes collection portion 6's exhibition flat effect better.
In a specific embodiment, the angle β between the blowing direction 4 and the tangential direction of the collecting section 6 satisfies: beta is more than or equal to 70 degrees and less than or equal to 90 degrees, the air flow carries out reverse diversion along the direction of the running of the paper 7, the acting force of the air flow on the paper 7 is larger, the requirement on the air source is reduced, the possibility of the crease and the curl of the paper 7 is reduced after the air flow acts on the paper 7, the flattening effect of the collecting part 6 is better, and the detection effect is improved.
In a particular embodiment, the line of extension of the blowing direction 4 intersects the axis of the impression cylinder 1, and the sheet 7 lying on the impression cylinder 1 is more easily flattened after the air flow has acted on the sheet 7, because the air flow direction is towards the axis of the impression cylinder.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A printing press paper flattening mechanism, comprising:
an impression cylinder (1) disposed inside a housing (9);
a flattening device (2) arranged inside the housing (9) and opposite to the impression cylinder (1);
wherein the flattening device (2) comprises a plurality of nozzles (23), and the plurality of nozzles (23) are arranged at intervals along the axial direction of the impression cylinder (1);
the nozzles (23) are used for forming fan-shaped air flows facing the impression cylinder (1), the fan-shaped air flows formed by the nozzles (23) are positioned on the same plane, and the fan-shaped air flows form continuous straight lines on the impression cylinder (1), and the straight lines are parallel to the axis of the impression cylinder (1).
2. The printing press paper flattening mechanism of claim 1, characterized in that the flattening device (2) further comprises:
the blowing cavity (21) is provided with the nozzles (23) uniformly;
the air supply device (22), the air transmission port (221) and the blowing cavity (21) are communicated through a control pipeline (24), and an electromagnetic valve (246) and a pressure reducing valve (245) are sequentially arranged on the control pipeline (24).
3. The printing press paper flattening mechanism of claim 1, characterized in that the nozzle (23) includes an air inlet end (231), an air feed channel (232), and an air outlet end (233);
and the air outlet end (233) is provided with a V-shaped groove which is gradually expanded towards the air outlet end (233) by taking the air feeding channel (232) as a vertex along the direction from the air inlet end (231) to the air outlet end (233).
4. The printing machine paper flattening mechanism according to claim 2, characterized in that both ends of the blowing cavity (21) are respectively provided with a first air inlet (211) and a second air inlet (212);
the control pipeline (24) comprises an air inlet (241), a first air outlet (242) and a second air outlet (243), the air inlet (241) is communicated with the air transmission port (221), the first air outlet (242) is communicated with the first air inlet (211), and the second air outlet (243) is communicated with the second air inlet (212).
5. The printing press paper flattening mechanism according to claim 4, characterized in that the first air inlet (211) and the second air inlet (212) have the same area of inner section;
the areas of the inner sections of the first air outlet (242) and the second air outlet (243) are the same.
6. The printing press paper flattening mechanism of claim 2, characterized in that the blowing cavities (21) extend in the axial direction of the impression cylinder (1);
along the direction perpendicular to the axis of the impression cylinder (1), the inner section of the blowing cavity (21) is circular, and the areas of the inner sections are the same.
7. The printing press paper flattening mechanism according to claim 1, characterized by further comprising an image acquisition mechanism (3), wherein the image acquisition mechanism (3) is disposed on the housing (9), an acquisition line (5) of the image acquisition mechanism (3) extends toward the axis of the impression cylinder (1) and forms an acquisition portion (6) at the impression cylinder (1);
the included angle alpha between the blowing direction (4) of the nozzle (23) and the extending direction of the image acquisition line (5) meets the following requirements: alpha is more than or equal to 0 and less than or equal to 20 degrees.
8. Printing press paper flattening mechanism according to claim 7, characterized in that the flattening device (2) is located downstream of the acquisition portion (6) in the paper transfer direction.
9. The printing press paper flattening mechanism according to claim 7, characterized in that an included angle β between the blowing direction (4) and the tangential direction of the collecting part (6) satisfies: beta is more than or equal to 70 degrees and less than or equal to 90 degrees.
10. Printing press paper flattening mechanism according to claim 7, characterized in that the line of extension of the blowing direction (4) intersects the axis of the impression cylinder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010869606.4A CN114103429A (en) | 2020-08-26 | 2020-08-26 | Paper flattening mechanism of printing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010869606.4A CN114103429A (en) | 2020-08-26 | 2020-08-26 | Paper flattening mechanism of printing machine |
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| Publication Number | Publication Date |
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| CN114103429A true CN114103429A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010869606.4A Pending CN114103429A (en) | 2020-08-26 | 2020-08-26 | Paper flattening mechanism of printing machine |
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| CN (1) | CN114103429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054424A (en) * | 2023-07-17 | 2023-11-14 | 浙江致信智控装备有限公司 | Machine vision cloth inspection device |
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2020
- 2020-08-26 CN CN202010869606.4A patent/CN114103429A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054424A (en) * | 2023-07-17 | 2023-11-14 | 浙江致信智控装备有限公司 | Machine vision cloth inspection device |
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