A feeding device for a printing machine

Abstract

This invention relates to the field of printing technology, specifically to a feeding device for a printing press, comprising a lifting frame, an integrated base one, an integrated base two, a paper feeding unit, and an auxiliary unit. In this invention, the downward-sloping suction of suction cup two replaces the existing side-blowing auxiliary method, which not only reduces the impact on the position of the remaining paper, but also ensures that paper is not adhered and thus does not affect subsequent printing operations by having two suction cups two on the left and right sides move synchronously with suction cup one and simultaneously perform the downward suction process. Furthermore, the downward pressure effect of the pressure base, pressure plate, and pressure roller limits the physical orientation of the conveyed paper and the remaining paper, further preventing paper misalignment from affecting the subsequent feeding process and the sequential printing process of the printing press.

Description

Technical Field

[0001] This invention relates to the field of printing technology, specifically to a feeding device for a printing press. Background Technology

[0002] The entire process before printing production is divided into machine preparation, feeding, printing, drying, paper collection, and post-printing. The feeding step involves feeding the paper prepared during machine preparation into the printing unit of the printing press in single sheets. Currently, for small and medium-sized printing presses, a semi-automatic feeding operation with manual assistance and mechanical support is usually used. However, for large printing presses, the feeding process is usually fully automated after machine preparation, i.e., after the entire stack of paper is transferred to the set feeding position.

[0003] The current feeding process is usually as follows: First, a single suction nozzle located in the center of the paper moves down and picks up the topmost sheet of paper. The paper is then moved and picked up by the movement of the suction nozzle. In addition, in order to prevent paper from sticking together due to the electrostatic effect between the sheets, air nozzles are set on both sides of the paper movement path in the existing technical solution, and the paper is assisted to fall off by blowing air, thereby avoiding the problem of multiple sheets of paper being fed at the same time, which would affect the subsequent printing process.

[0004] The existing feeding process has the following problems: the direct blowing method from both sides makes it difficult to ensure accurate separation of paper when paper is stuck together. In addition, if the paper is separated and reset under the auxiliary operation method, the pressure applied by the blowing from both sides will affect the position of the remaining paper, resulting in subsequent paper displacement and affecting the subsequent feeding quality. Summary of the Invention

[0005] Therefore, it is necessary to provide a feeding device for a printing press, which aims to solve the problems of the prior art mentioned above.

[0006] This application provides a feeding device for a printing press, which is disposed on the front side of the printing press and includes: an outer frame, which is disposed on the front side of the printing press and is connected to the printing press by an inclined guide plate. After the feeding operation, a single sheet of paper enters the printing press through the guide plate.

[0007] Below the outer frame is a lifting frame for placing paper stacks. The lifting frame is driven by an external hydraulic lifting device to move up and down. The outer frame is equipped with an integrated seat 1 located above the middle of the lifting frame and two integrated seats 2 located above the front and rear sides of the integrated seat 1 respectively. The integrated seat 1 is equipped with a paper picking unit, and the two integrated seats 2 are equipped with auxiliary units.

[0008] The paper-taking unit includes an electric slider. Two electric sliders are slidably arranged on the lower part of the integrated base. Two suction cups are arranged on the lower part of the electric sliders via an electric push rod. Suction cups are also arranged on the electric sliders.

[0009] The paper-taking unit also includes a pressure plate that works in conjunction with the suction cup 2. When the suction cup 2 is in operation, it is tilted and the pressure plate is away from the paper stack. When the suction cup 2 stops operating, the pressure plate presses down on the paper stack.

[0010] The auxiliary unit includes a pressure plate and a pressure roller. The integrated base is equipped with a pressure plate and a pressure roller for pressing down the uppermost paper.

[0011] The uppermost sheet of paper is picked up and transferred by the intermittent up-and-down movement and forward-and-backward movement of suction cup one. Single sheet feeding is achieved by applying a suction force less than that of suction cup one to the lower part of the uppermost sheet of paper with suction cup two. The position of subsequent sheets is limited by the lower pressure seat, lower pressure plate and lower pressure roller.

[0012] According to an advantageous embodiment, the two suction cups are respectively located on the left and right sides above the paper. The paper picking unit also includes a follower seat. The back sides of the two electric sliders are fixedly provided with follower seats by L-shaped frames. The opposite sides of the two follower seats are fixedly provided with two front-to-back fixed frames.

[0013] Two fixed frames are provided with rotating shafts that extend forward and backward on the same axis. A U-shaped frame is fixedly sleeved on the rotating shaft. There are two suction cups, which are fixedly sleeved on the corresponding U-shaped frames. When the suction cups are tilted, they face downwards towards the adjacent suction cup and maintain a set distance from the downwards of the suction cup.

[0014] According to an advantageous embodiment, a drive shaft with an axis extending forward and backward is provided on both corresponding fixed frames for rotation. The drive shaft is connected to a servo motor, and the drive shaft and the corresponding rotating shaft are driven by a pulley.

[0015] Both the front and rear sides of the rotating shaft are fitted with extension shafts, and gears are fixedly fitted on both the extension shafts and the drive shaft, with adjacent gears meshing.

[0016] According to an advantageous embodiment, a connecting frame is fixedly sleeved on the extension shaft, and a lower pressure seat is fixedly disposed on the connecting frame. The lower pressure seat is L-shaped.

[0017] When the U-shaped frame is tilted, the connecting frame is vertical, assisting in paper detachment. When the connecting frame is horizontal, the U-shaped frame is vertical, limiting and pressing down the paper stack.

[0018] According to an advantageous embodiment, transmitters are fixedly mounted on both the front and rear sides of the left-side follower seat via mounting brackets, and receivers are fixedly mounted on the right-side follower seat opposite to the transmitters.

[0019] According to an advantageous embodiment, the transmitter and receiver are located within the suction cup-feeding paper forming area and on the side of the uppermost paper closest to the horizontal section of the paper.

[0020] According to an advantageous embodiment, the auxiliary unit further includes a fixed base, and two left-right distributed fixed bases are fixedly arranged on the opposite surfaces of the two integrated bases. An electric push rod is arranged on the fixed base, and a lower pressure plate is fixedly arranged on the telescopic section of the electric push rod.

[0021] According to an advantageous embodiment, the auxiliary unit further includes mounting rods, and mounting rods extending forward and backward along the axis are fixedly provided on both the left and right end faces of the integrated base two. Multiple L-shaped fitting seats are fixedly sleeved on the mounting rods along their axial direction, and the vertical sections of the fitting seats fit against the side of the upper part of the paper stack.

[0022] A sliding rod slides through the horizontal section of the fitting seat. A U-shaped plate is fixedly installed on the upper end face of the sliding rod. The U-shaped area of ​​the U-shaped plate faces downward and the lower pressure roller is rotatably installed within its U-shaped area. The axis of the lower pressure roller extends to the left and right.

[0023] In summary, the present invention has the following beneficial effects: The present invention uses a downward suction method with suction cup two to replace the existing side-blowing auxiliary method, which not only reduces the impact on the position of the remaining paper, but also ensures that the paper will not be adsorbed and affect subsequent printing operations by having suction cup two on the left and right sides move synchronously with suction cup one and simultaneously perform the downward suction process. Secondly, the downward pressure effect of the pressure seat, pressure plate, and pressure roller on the paper limits the physical orientation of the conveyed paper and the remaining paper, further preventing paper offset from affecting the subsequent feeding process and the sequential printing process of the printing press. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of a feeding device for a printing press according to an embodiment of the present invention is shown; Figure 2 A front view of a feeding device for a printing press according to an embodiment of the present invention is shown; Figure 3 A three-dimensional structural diagram of the transmitter, receiver, and follower provided according to an embodiment of the present invention is shown; Figure 4A three-dimensional structural diagram of the lower pressure plate, lower pressure roller, and fixed base provided according to an embodiment of the present invention is shown; Figure 5 This diagram illustrates a three-dimensional structure between suction cup one, suction cup two, and the lower pressure seat according to an embodiment of the present invention. Figure 6 This is a three-dimensional structural diagram of the suction cup 2, the lower pressure seat and the drive shaft provided according to an embodiment of the present invention; Figure 7 A schematic diagram showing the state changes between the suction cup 2 and the lower pressure seat according to an embodiment of the present invention is shown.

[0026] The above-mentioned attached drawings include the following reference numerals: 1. Outer frame; 2. Guide plate; 3. Lifting frame; 4. Integrated seat one; 5. Integrated seat two; 6. Paper picking unit; 60. Electric slider; 61. Suction cup one; 62. Suction cup two; 63. Lower pressure seat; 64. Follower seat; 640. Fixed frame; 641. Rotating shaft; 642. U-shaped frame; 643. Drive shaft; 644. Extension shaft; 645. Gear; 646. Connecting frame; 65. Transmitter; 66. Receiver; 7. Auxiliary unit; 70. Lower pressure plate; 71. Lower pressure roller; 72. Fixed seat; 73. Mounting rod; 74. Adhesive seat; 75. Slide rod; 76. U-shaped plate. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] like Figure 1 and Figure 2 As shown, a feeding device for a printing press is installed on the front side of the printing press and includes: an outer frame 1. The outer frame 1 is installed on the front side of the printing press and is connected to the printing press by an inclined guide plate 2. After the feeding operation, a single sheet of paper enters the printing press through the guide plate 2.

[0029] Below the outer frame 1 is a lifting frame 3 for placing paper stacks. The lifting frame 3 is driven by an external hydraulic lifting device to move up and down. The outer frame 1 is provided with an integrated seat 4 located above the middle of the lifting frame 3 and two integrated seats 5 located above the front and rear sides of the integrated seat 4 respectively. The integrated seat 4 is provided with a paper picking unit 6, and the two integrated seats 5 are provided with auxiliary units 7.

[0030] like Figure 2 , Figure 3 and Figure 5 As shown, the paper-taking unit 6 includes an electric slider 60. Two electric sliders 60 are slidably arranged on the lower part of the integrated base 4. Two suction cups 61 are arranged on the lower part of the electric sliders 60 via an electric push rod. The suction cups 61 are connected to an external air pump (not shown in the figure) via a pipe. The electric sliders 60 are equipped with suction cups 62, which are also connected to an external air pump (not shown in the figure).

[0031] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the paper picking unit 6 also includes a pressing seat 63 that works in conjunction with the suction cup 62. When the suction cup 62 is in operation, it is tilted and the pressing seat 63 is away from the paper stack. When the suction cup 62 stops operating, the pressing plate 70 presses down on the paper stack.

[0032] The auxiliary unit 7 includes a lower pressure plate 70 and a lower pressure roller 71. The integrated base 2 5 is provided with a lower pressure plate 70 and a lower pressure roller 71 for pressing down the uppermost paper.

[0033] During operation, the paper stack is transferred to the lifting frame 3 and raised to the loading height. The electric slider 60 is initially located near the front. Then, suction cup 61 moves down to adhere to and hold the topmost paper. Suction cup 61 moves up, and the electric slider 60 drives suction cup 61 to move backward synchronously. This action first causes the topmost paper to form an arch and move backward. It should be noted that: because the paper area is large, the arching of some areas does not affect the overall flat shape and the backward movement of suction cup 61 allows the paper being picked up to move backward synchronously. During the above process, suction cup 62 moves synchronously. When the topmost paper is picked up and forms an arch, suction cup 62 is moved into the arch area and located below suction cup 61. Suction cup 62 provides a set suction force to the lower side of the arched area of ​​the paper. Therefore, three situations are explained: 1. The topmost paper is attracted by electrostatic adsorption. When the paper is sucked in, there are several scenarios: 1. The second sheet of paper is sucked onto the top sheet and does not return to its original position due to its own weight. In this case, the suction force of suction cup 2 62 helps the adhered paper return to its original position. 2. The second sheet of paper is sucked onto the top sheet and returns to its original position due to its own weight. 3. The second sheet of paper is not sucked onto the top sheet. For scenarios 2 and 3, since the suction force of suction cup 2 62 is less than that of suction cup 1 61 and the distance between suction cup 2 62 and the paper is greater than that between suction cup 1 61 and the paper, the suction effect of the top sheet of paper will not be affected. In summary, the downward suction process of suction cup 2 62 ensures accurate feeding of single sheets of paper. In addition, the downward pressure effect of the lower pressure seat 63, lower pressure plate 70 and lower pressure roller 71 limits the orientation of the conveyed paper and the remaining paper, avoiding paper deviation that may affect the subsequent feeding process and the sequential use of the printing press.

[0034] In summary, compared with the existing top suction and side blowing feeding method, this technical solution not only ensures the feeding requirements of a single sheet of paper, but also avoids the impact of side blowing on the position of the remaining paper in the existing feeding process, that is, accurate single sheet feeding and maintaining the physical orientation of the remaining paper.

[0035] like Figure 3 , Figure 5 and Figure 6 As shown, the two suction cups 61 are located on the left and right sides above the paper, respectively. The paper taking unit 6 also includes a follower seat 64. The back sides of the two electric sliders 60 are fixedly provided with follower seats 64 by L-shaped frames. The opposite sides of the two follower seats 64 are fixedly provided with two front-to-back fixed frames 640.

[0036] Two fixed frames 640 are provided with rotating shafts 641 extending back and forth on the same axis. A U-shaped frame 642 is fixedly sleeved on the rotating shaft 641. There are two suction cups 62, which are fixedly sleeved on the corresponding U-shaped frame 642. When the suction cup 62 is tilted, it faces the lower part of the adjacent suction cup 61 and maintains a set distance from the lower part of the suction cup 61.

[0037] Two fixed brackets 640 are equipped with drive shafts 643 that extend back and forth on their axes. The drive shafts 643 are connected to servo motors and are driven by pulleys to the corresponding rotating shafts 641.

[0038] Both the front and rear sides of the rotating shaft 641 are rotatably fitted with extension shafts 644, and gears 645 are fixedly fitted on both the extension shaft 644 and the drive shaft 643, with adjacent gears 645 meshing.

[0039] A connecting frame 646 is fixedly sleeved on the extension shaft 644, and a lower pressure seat 63 is fixedly installed on the connecting frame 646. The lower pressure seat 63 is L-shaped.

[0040] When the U-shaped frame 642 is tilted, the connecting frame 646 is vertical, assisting in paper detachment; when the connecting frame 646 is horizontal, the U-shaped frame 642 is vertical, limiting and pressing down the paper stack.

[0041] When no paper is being picked up, the U-shaped frame 642 and the connecting frame 646 overlap, meaning that the corresponding suction cup 62 and the pressing seat 63 avoid the paper picking process. It should also be noted that the rotation angle range of the U-shaped frame 642 and the connecting frame 646 is the result of multiple tests conducted by those skilled in the art. Within this fixed rotation angle range, suction cup 62 can move below the corresponding suction cup 62, the pressing seat 63 can press down on the remaining paper stack, and suction cup 62 and the pressing seat 63 can avoid each other. This fixed rotation angle range is set before operation and is therefore prior art, which will not be elaborated upon further.

[0042] Suction cup 1 61 picks up the topmost piece of paper and moves upward, forming an arched area. Suction cup 2 62 and the pressure seat 63 move synchronously with the electric slider 60, thus always remaining on the left and right sides of the arched area. Subsequently, the servo motor drives the drive shaft 643 to rotate synchronously. The drive shaft 643 drives the corresponding rotating shaft 641 to rotate synchronously via a pulley. The rotating shaft 641 drives suction cup 2 62 to rotate synchronously via a U-shaped frame 642. The meshing of the two corresponding gears 645 causes the extension shaft 644 to rotate synchronously in the opposite direction. The extension shaft 644 drives the pressure seat 63 to rotate synchronously via a connecting frame 646. At this point, suction cup 2 62 enters the corresponding arched area, while the pressure seat 63 moves away from the arched area. (See reference...) Figure 7 Then, suction is applied below the highest point of the arched area of ​​suction cup 62. If two sheets of paper are stuck together, the above-mentioned auxiliary method is used to make the second sheet of paper reset and separate.

[0043] like Figure 3 and Figure 5 As shown, transmitters 65 are fixedly mounted on both the front and rear sides of the left follower seat 64 via mounting brackets, and receivers 66 are fixedly mounted on the right follower seat 64, which are opposite to the transmitters 65.

[0044] The transmitter 65 and receiver 66 are located within the area where the suction cup 61 picks up the paper and are located on the side of the uppermost paper closest to the horizontal section of the paper.

[0045] As the suction cup 61 picks up the topmost piece of paper and moves it upwards, the paper moves upwards and passes through the coverage area of ​​the transmitter 65 and receiver 66. Therefore, the infrared signal emitted by the transmitter 65 is blocked by the paper during its movement, and the receiver 66 fails to receive the infrared signal. After the paper forms an arched area, the infrared signal emitted by the transmitter 65 is received by the receiver 66, and the received signal is fed back to the control center. The control center analyzes the signal feedback and controls the rotation of the servo motor.

[0046] When the paper is separated with the help of auxiliary operations, due to the positions of transmitter 65 and receiver 66, the areas where transmitter 65 and receiver 66 transmit and receive infrared signals are closer to the edge of the arched area. Therefore, when the paper returns to its original position, the paper will first block the area for transmitting and receiving signals. Thus, when the paper falls back, before it touches suction cup 62, the paper blocks the area for transmitting and receiving signals. The control center causes the servo motor to rotate in the opposite direction, causing suction cup 62 to quickly move away from the paper. After suction cup 62 moves away from the arched area, it moves slowly, giving the paper sufficient time to fall back. After the paper falls back, the pressure seat 63 moves into the arched area, and the horizontal section of the pressure seat 63 presses down on the remaining paper stack. In addition, the vertical section of the pressure seat 63 adheres to and limits the area above the paper stack. Then, suction cup 61 follows the electric... The sliding block 60 moves backward synchronously, and the lower pressure seat 63 moves synchronously as well. During the movement, the vertical section of the lower pressure seat 63 adjusts the position of the upper side of the paper stack to avoid the problem that the position of the remaining paper changes during the feeding process, which would affect the printing press's performance after subsequent feeding. After the paper moves to the guide plate 2 via the first suction cup 61, the guide plate 2 tilts and the paper weighs itself. When the area of ​​the paper on the guide plate 2 is larger than the area on the paper stack, the first suction cup 61 releases its suction, and the paper is automatically unloaded and moves down along the guide plate 2. This completes the feeding operation of a single sheet of paper. The first suction cup 61 and the second suction cup 62 are both reset. The above operation process is repeated to continuously feed single sheets of paper. The above operation process is explained for the first feeding situation, that is, when the paper is attached and does not fall back to its original position under its own weight.

[0047] Secondly, regarding the second scenario: the attached paper resets under its own gravity, similar to the above process, through the coordination between the transmitter 65 and the receiver 66, it is determined that the paper has fallen back during the suction cup 61's paper adsorption operation. Therefore, the servo motor's rotation direction is directly controlled to cause the pressure seat 63 to press down and adhere. As for the third scenario: no paper is attached, the operation process in the first scenario is repeated, with the suction cup 62 adsorbing the paper to ensure that no paper is attached. Then, the pressure seat 63 directly presses down and adheres, further ensuring the accurate fulfillment of the single-sheet paper feeding requirement.

[0048] It should be further explained that the servo motor is a high-speed servo motor, and the distance between the suction cup 62 and the highest point of the arched area, as well as the positions of the transmitter 65 and the receiver 66, have all been obtained by external personnel in the art through multiple tests. Therefore, when the attached paper falls, the rapid response of the servo motor enables the suction cup 62 to detach from the arched area, thus avoiding the contact obstruction problem between the suction cup 62 and the reset paper. The above features are all existing external technical features and will not be elaborated further.

[0049] like Figure 2 , Figure 3 and Figure 4 As shown, the auxiliary unit 7 also includes a fixed base 72. Two fixed bases 72 are fixedly arranged on the opposite surfaces of the two integrated bases 5, and electric push rods are provided on the fixed bases 72. The lower pressure plate 70 is fixedly arranged on the telescopic section of the electric push rod.

[0050] The auxiliary unit 7 also includes a mounting rod 73. The left and right end faces of the integrated base 2 5 are both fixedly provided with mounting rods 73 extending forward and backward along the axis. Multiple L-shaped fitting seats 74 are fixedly sleeved on the mounting rod 73 along its axis. The vertical section of the fitting seat 74 fits the side of the upper part of the paper stack.

[0051] A slide rod 75 slides through the horizontal section of the fitting seat 74. A U-shaped plate 76 is fixedly installed on the upper end face of the slide rod 75. The U-shaped area of ​​the U-shaped plate 76 faces downward and the lower pressure roller 71 is rotatably installed in its U-shaped area. The axis of the lower pressure roller 71 extends left and right.

[0052] During operation, when no paper-fetching is being performed, the telescopic section of the electric push rod drives the corresponding lower pressure plate 70 to press down above the paper stack. The lower pressure roller 71, under its own weight and that of the U-shaped plate 76, also presses down onto the paper stack. During paper-fetching, the telescopic section of the electric push rod drives the lower pressure plate 70 to move upwards. Then, the suction cup 61 performs the paper-fetching operation. Once the paper forms an arched area and the attached paper has been properly reset, the telescopic section of the electric push rod drives the lower pressure plate 70 to quickly reset and move downwards, thus pressing down the remaining paper to prevent the remaining paper from being pulled away due to the movement of the topmost paper and the electrostatic attraction between the papers. The change in position affects the final feeding quality. In addition, throughout the process, the lower pressure roller 71 always presses down on the topmost paper by its own weight, and due to the rotation characteristics of the lower pressure roller 71, the paper movement is not affected. The precise fit of the lower pressure roller 71 ensures that the vertical section of the bonding seat 74 always fits the upper layer of paper. In summary, by picking up the paper from the front and rear sides in conjunction with the left and right limiting of the bonding seat 74, and by using the suction cup 62 to pick up the paper from top to bottom, compared with the existing technology of applying air from left to right, it reduces the interference with the left and right position of the remaining paper, ensures that the paper position is not changed, and improves the final feeding effect.

[0053] It should be further explained that: In the prior art, a single suction point is set at the top for paper feeding, while air blowing points are set on both sides of the paper. The air pressure blown from the air blowing points assists in the separation of the paper, thus enabling continuous feeding of multiple sheets of paper. In this technical solution, suction cup 1 61, suction cup 2 62, lower pressure seat 63, lower pressure plate 70, and lower pressure roller 71 are added. The two suction cups 1 61 located on the left and right sides of the paper improve the stability of the paper during feeding. The suction assistance of suction cup 2 62 avoids the influence of air blowing on the position of the remaining paper in the prior art, thus ensuring the feeding of a single sheet of paper and meeting the requirements of precise feeding. Furthermore, the added components are all existing conventional mechanical parts, which can be used for a long time after installation. In summary, this technical solution is a specific improvement made entirely based on and to solve the defects of the prior art.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A feeding device for a printing press, disposed on the front side of the printing press, characterized in that, include: An outer frame is provided on the front side of the printing press. The outer frame is connected to the printing press by an inclined guide plate. After the feeding operation, a single sheet of paper enters the printing press through the guide plate. Below the outer frame is a lifting frame for placing paper stacks. The lifting frame is driven by an external hydraulic lifting device to move up and down. The outer frame is equipped with an integrated seat 1 located above the middle of the lifting frame and two integrated seats 2 located above the front and rear sides of the integrated seat 1 respectively. The integrated seat 1 is equipped with a paper picking unit, and the two integrated seats 2 are equipped with auxiliary units. The paper-taking unit includes an electric slider. Two electric sliders are slidably arranged on the bottom of the integrated base. Two suction cups are arranged on the bottom of the electric sliders via an electric push rod. Suction cups are also arranged on the electric sliders. The paper-taking unit also includes a pressure plate that works in conjunction with the suction cup 2. When the suction cup 2 is working, it is tilted and the pressure plate is away from the paper stack. When the suction cup 2 stops working, the pressure plate presses down on the paper stack. The auxiliary unit includes a lower pressure plate and a lower pressure roller. The integrated base 2 is equipped with a lower pressure plate and a lower pressure roller for pressing down the uppermost paper. The first suction cup intermittently lifts and lowers and moves back and forth to pick up and transfer the top sheet of paper. The second suction cup applies a suction force less than that of the first suction cup to the bottom of the top sheet of paper for single-sheet feeding. The lower pressure seat, lower pressure plate and lower pressure roller limit the position of the subsequent paper.

2. The feeding device for a printing press according to claim 1, characterized in that: The two suction cups are located on the left and right sides above the paper, respectively. The paper picking unit also includes a follower seat. The back sides of the two electric sliders are fixedly provided with follower seats by L-shaped frames. The opposite sides of the two follower seats are fixedly provided with two front-to-back fixed frames. Two fixed frames are provided with rotating shafts that extend forward and backward on the same axis. A U-shaped frame is fixedly sleeved on the rotating shaft. There are two suction cups, which are fixedly sleeved on the corresponding U-shaped frames. When the suction cups are tilted, they face downwards towards the adjacent suction cup and maintain a set distance from the downwards of the suction cup.

3. The feeding device for a printing press according to claim 2, characterized in that: Two fixed frames are equipped with drive shafts that extend forward and backward on their axes. The drive shafts are connected to servo motors and are driven by pulleys. Both the front and rear sides of the rotating shaft are fitted with extension shafts, and gears are fixedly fitted on both the extension shafts and the drive shaft, with adjacent gears meshing.

4. The feeding device for a printing press according to claim 3, characterized in that: A connecting frame is fixedly sleeved on the extension shaft, and a lower pressure seat is fixedly installed on the connecting frame. The lower pressure seat is L-shaped. When the U-shaped frame is tilted, the connecting frame is vertical, assisting in paper detachment; when the connecting frame is horizontal, the U-shaped frame is vertical, limiting and pressing down the paper stack.

5. A feeding device for a printing press according to claim 2, characterized in that: The transmitters are fixedly mounted on both the front and rear sides of the follower seat on the left side via mounting brackets, and the receivers are fixedly mounted on the follower seat on the right side, which are opposite to the transmitters.

6. The feeding device for a printing press according to claim 5, characterized in that: The transmitter and receiver are located within the suction cup area where the paper is formed and on the side of the uppermost paper closest to the horizontal section of the paper.

7. The feeding device for a printing press according to claim 1, characterized in that: The auxiliary unit also includes a fixed base. Two fixed bases are fixedly arranged on the opposite surfaces of the two integrated bases. An electric push rod is provided on the fixed base, and the lower pressure plate is fixedly arranged on the telescopic section of the electric push rod.

8. A feeding device for a printing press according to claim 1, characterized in that: The auxiliary unit also includes mounting rods. Mounting rods extending forward and backward along the axis are fixedly provided on both the left and right end faces of the integrated base two. Multiple L-shaped fitting seats are fixedly sleeved on the mounting rods along their axial direction. The vertical section of the fitting seat fits the side of the upper part of the paper stack. A sliding rod slides through the horizontal section of the fitting seat. A U-shaped plate is fixedly installed on the upper end face of the sliding rod. The U-shaped area of ​​the U-shaped plate faces downward and the lower pressure roller is rotatably installed within its U-shaped area. The axis of the lower pressure roller extends to the left and right.

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