Duplex paper printing paper collection device and method

Abstract

The application discloses a double-coated paper printing paper output collection device and method, and relates to the technical field of printing. In the application, a first orientation detector vertically downwardly detecting is arranged on one side of a paper outlet of an output base frame, wherein the first orientation detector is located above the paper outlet. A side position detection assembly is fixedly arranged on the opposite side of the paper outlet of the output base frame, the side position detection assembly is provided with a plurality of distance sensor probes with sensing detection directions obliquely oriented towards the orientation of the paper outlet and a second orientation detector vertically downwardly sensing. A high-position air pipe component and a low-position air pipe component are arranged below the paper outlet of the output base frame, the high-position air pipe component is located above the low-position air pipe component, the output base frame is provided with a high-position rotating mechanism for driving and adjusting the rotating angle of the high-position air pipe component and a low-position rotating mechanism for driving and adjusting the rotating angle of the low-position air pipe component. The application avoids the front end position of the falling paper to be rolled in, and reduces the influence degree of the front end of the paper on the printing of the surface of the paper below.

Description

Technical Field

[0001] This invention relates to the field of printing technology, and in particular to a paper collection device and method for double-sided offset printing. Background Technology

[0002] Offset paper is mainly used for printing high-quality color printed materials on offset printing presses or other printing presses. It is suitable for printing monochrome or multicolor book covers, text, inserts, pictorials, maps, posters, color trademarks, and various packaging materials.

[0003] When offset printing is being produced, the paper naturally droops due to its own weight, falling in an arch shape. When the front end of the paper lands on the support bracket or on top of existing paper, it may sometimes "roll in" or "flip over". In addition, the front end of the paper may scratch the upper surface of the already collected paper, which may have adverse effects on some offset printing that is not completely "dry". Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a paper collection device and method for double-sided offset printing, thereby avoiding inward curling of the front end of the paper during the falling process and reducing the impact of the front end of the paper on the printing surface of the paper below.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention provides a paper collection device for double-sided offset printing, including a feeding base frame. A paper feeding mechanism and a paper outlet are disposed on the upper part of the feeding base frame. A paper tray assembly and a sliding stop assembly are disposed within the inner perimeter of the feeding base frame. The paper tray assembly includes a bracket and a servo motor for driving and adjusting the height of the bracket. The sliding stop assembly includes a lifting baffle and a sliding adjustment device for driving and adjusting the height of the lifting baffle. A sliding angle plate is provided at the upper end of the lifting baffle. A first azimuth detector that detects vertically downwards is disposed on one side of the paper outlet of the feeding base frame, wherein the first azimuth detector is located above the paper outlet. A lateral detection assembly is fixedly disposed on the opposite side of the paper outlet of the feeding base frame. The lateral detection assembly is equipped with several distance sensing probes whose sensing direction is tilted towards the paper outlet and a second azimuth detector that detects vertically downwards. Below the paper outlet of the discharge base frame are high-level air pipes and low-level air pipes. The high-level air pipes are located above the low-level air pipes. The discharge base frame is equipped with a high-level rotation mechanism for driving and adjusting the rotation angle of the high-level air pipes and a low-level rotation mechanism for driving and adjusting the rotation angle of the low-level air pipes.

[0007] As a preferred technical solution of the double-sided offset paper printing paper collection device of the present invention: the output end of the servo motor is equipped with an output shaft, the output shaft is provided with a threaded section, the bottom side of the bracket is fixedly connected to the lifting frame, the bottom of the lifting frame is provided with a threaded cylinder, and the threaded section of the output shaft is screwed into the position of the threaded cylinder.

[0008] As a preferred technical solution of the paper collection device for double-sided offset paper printing of the present invention: the bracket is provided with a longitudinal slot, and the lifting baffle moves through the longitudinal slot.

[0009] As a preferred technical solution of the paper collection device for double-sided offset paper printing of the present invention: the horizontal position of the highest distance sensing probe among a plurality of distance sensing probes is higher than the horizontal position of the paper outlet.

[0010] As a preferred technical solution of the paper collection device for double-sided offset paper printing of the present invention: the side position detection component includes a fixed bracket fixedly connected to the inner wall of the discharge base frame, a second position detector fixedly installed at the position of the fixed bracket, the side end of the fixed bracket being vertically connected to the inclined side plate, and a number of distance sensing probes installed in the area below the inclined side plate.

[0011] As a preferred technical solution of the paper collection device for double-sided offset paper printing of the present invention: the discharge base frame is equipped with a side ventilation network located on the opposite side of the high-position air pipe and the low-position air pipe.

[0012] This invention provides a method for collecting the output paper from offset printing, the specific steps of which are as follows:

[0013] S1. When the first position detector does not detect paper output downwards, the high-position rotation mechanism drives the high-position air tube to rotate to the "high-position initial position", and the low-position rotation mechanism drives the low-position air tube to rotate to the "low-position initial position".

[0014] S2. The paper output mechanism starts outputting paper. The first position detector detects the paper output status, and several distance sensor probes are activated to detect any obstruction signals at the front end of the paper. Let the positions of the several distance sensor probes, distributed from top to bottom, be {W1 W2 W3...W...} n Let there be n angles {α1α2α3...α} in the tilt position of the high-position air pipe fitting during rotation. n}, among which, α1, α2, α3,..., α n The upward tilt angles decrease sequentially. Therefore, the following holds: That is, when the distance sensor probe at any position detects the paper blocking signal, the high-position air tube will rotate to the upward tilt angle position corresponding to the position of the distance sensor probe. Among them, the priority of the upward tilt angle position at the low position is higher than the priority of the upward tilt angle position at the high position.

[0015] S3. Multiple distance sensors that have detected the paper obstruction signal simultaneously detect the distance information at the corresponding positions. Let the distance information detected by the multiple distance sensors from top to bottom be {S1 S2 S3...S}. m If the distance information detected by the lowest position distance sensor is not the minimum value among all distance information, then there exists a paper arching difference ΔS = S. m -S min , of which S min Let F(V) be the minimum distance information detected by multiple distance sensing probes. Then, the air outlet velocity of the high-level air duct is F(V), and the air outlet velocity F(V) ∝ ΔS.

[0016] S4. When the distance sensor probe at the lowest position in the side detection assembly detects the paper blocking signal, the high-position air tube stops blowing air, and the high-position rotation mechanism drives the high-position air tube to rotate upward to the "high-position initial position". At the same time, the low-position air tube, which is in the "low-position initial position", begins to emit air. The low-position rotation mechanism drives the low-position air tube to rotate upward at a constant speed to a certain angle and then stops rotating.

[0017] S5. After the first position detector fails to detect the paper obstruction signal downwards, the low-position air tube stops blowing air, and the low-position rotation mechanism drives the low-position air tube to rotate downwards back to the "low-position initial position".

[0018] Compared with existing technologies, the beneficial effects of this invention are:

[0019] During the paper output process, this invention uses a side-position detection component to sense and detect the movement of the paper in real time. A high-position air pipe is used to dynamically blow air onto the front end of the paper to prevent the front end from curling inward during the descent of the paper. A low-position air pipe is used to "push" the front end of the paper with airflow, and an air film is also formed between the paper output and the paper below to reduce the impact of the front end of the paper output on the printing surface of the paper below. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the paper collection device for double-sided offset paper printing according to the present invention.

[0021] Figure 2 This is a schematic diagram of the paper output mechanism in this invention during paper output.

[0022] Figure 3 This is a schematic diagram of the paper output reaching the lowest position of the distance sensing probe in this invention.

[0023] Figure 4 This is a schematic diagram of the low-position air tube in this invention being blown with air.

[0024] Figure 5This is a schematic diagram of the low-position air pipe component stopping blowing and resetting in this invention.

[0025] The components are as follows: 1-Discharge base frame; 2-Paper tray assembly, 201-Servo motor, 202-Output shaft, 203-Threaded section, 204-Lifting frame, 205-Threaded cylinder, 206-Bracket, 207-Vertical slot; 3-Slide shifting assembly, 301-Slide shifting adjustment device, 302-Lifting baffle, 303-Slide slope plate; 4-Paper output mechanism, 401-Paper output port; 5-First orientation detector; 6-Side orientation detection assembly, 601-Fixed bracket, 602-Slanted side base plate, 603-Distance sensor probe, 604-Second orientation detector; 7-High-position air pipe fitting; 8-High-position rotating mechanism; 9-Low-position air pipe fitting; 10-Low-position rotating mechanism; 11-Side ventilation mesh; 12-Double-sided offset printing paper. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] Example 1

[0028] Please see Figure 1 This invention relates to a paper collection device for double-sided offset printing, the specific structural configuration of which is as follows:

[0029] The paper output mechanism 4 and the paper output port 401 are located on the upper part of the paper output base 1. The first orientation detector 5 (the first orientation detector 5 can be a photoelectric sensor) is installed on one side of the paper output port 401 of the paper output base 1. The first orientation detector 5 is located above the paper output port 401 and detects vertically downward.

[0030] The high-position air pipe 7 and the low-position air pipe 9 are embedded and installed below the paper outlet 401 of the discharge base frame 1, with the high-position air pipe 7 located above the low-position air pipe 9. The discharge base frame 1 is equipped with a high-position rotation mechanism 8 and a low-position rotation mechanism 10. The high-position rotation mechanism 8 is used to drive and adjust the rotation angle of the high-position air pipe 7, and the low-position rotation mechanism 10 is used to drive and adjust the rotation angle of the low-position air pipe 9. The discharge base frame 1 is equipped with a side ventilation net 11 located on the opposite side of the high-position air pipe 7 and the low-position air pipe 9. When the high-position air pipe 7 and the low-position air pipe 9 are blowing air, the airflow can be smoothly discharged from the side ventilation net 11.

[0031] A side-position detection component 6 is fixedly installed on the opposite side of the paper outlet 401 of the discharge base frame 1. The side-position detection component 6 includes a fixed bracket 601 and an inclined base plate 602. The fixed bracket 601 is fixedly connected to the inner wall of the discharge base frame 1. The inclined base plate 602 is inclined and vertically fixedly connected to the side end of the fixed bracket 601. A second orientation detector 604 is fixedly installed at the fixed bracket 601. The second orientation detector 604 senses vertically downwards (the second orientation detector 604 can be a photoelectric distance sensor). Several distance sensing probes 603 are installed in the area below the inclined base plate 602. The sensing direction of the several distance sensing probes 603 is inclined towards the orientation of the paper outlet 401. Among them, the horizontal position of the highest distance sensing probe 603 is higher than the horizontal position of the paper outlet 401.

[0032] The inner circumference of the discharge base frame 1 is equipped with a paper tray assembly 2. The paper tray assembly 2 includes a servo motor 201 and a bracket 206. The servo motor 201 includes an output shaft 202 that is vertically upward. The output shaft 202 is provided with a threaded section 203. The bottom side of the bracket 206 is fixedly connected to a lifting frame 204. The bottom of the lifting frame 204 is provided with a threaded cylinder 205. The threaded section 203 of the output shaft 202 is screwed into the position of the threaded cylinder 205 (the inner wall of the threaded cylinder 205 is threaded, and the threaded section 203 of the output shaft 202 is threadedly connected to the inner wall of the threaded cylinder 205). The servo motor 201 drives the output shaft 202 to rotate, and the threaded section 203 and the threaded cylinder 205 rotate relative to each other, so that the lifting frame 204 and the bracket 206 can be linearly adjusted to lift and lower.

[0033] The inner circumference of the discharge base frame 1 is equipped with a downward sliding stop assembly 3, which includes a downward sliding adjustment device 301, a lifting baffle 302, and a sliding angle plate 303. The downward sliding adjustment device 301 is used to drive and adjust the height position of the lifting baffle 302, and the sliding angle plate 303 is located at the upper end of the lifting baffle 302. The bracket 206 has a longitudinal slot 207 whose structural dimensions match those of the lifting baffle 302, and the lifting baffle 302 moves through the longitudinal slot 207.

[0034] Example 2

[0035] This invention relates to a method for collecting the output paper of offset printing, the specific steps of which are as follows:

[0036] In the first step, when the first orientation detector 5 fails to detect paper output downwards, the high-position rotation mechanism 8 drives the high-position air tube 7 to rotate to the "high-position initial position" (e.g., Figure 1 In the middle, the high-position air tube 7 is at the position with the largest upward tilt angle within its rotatable range, and the low-position rotating mechanism 10 drives the low-position air tube 9 to rotate to the "low-position initial position" (e.g., Figure 1 In the middle, the low-position air pipe component 9 is at its maximum downward tilt angle within its rotatable range.

[0037] The second step is to combine Figure 2 The paper feeding mechanism 4 starts feeding paper, the first orientation detector 5 detects the feeding status, and several distance sensing probes 603 are activated to detect the obstruction signal at the front end of the paper (the function of the distance sensing probe 603 is to detect distance, but when there is no paper obstruction, the distance signal detected by the distance sensing probe 603 exceeds its own detection distance parameter, which can be considered as the detected distance being ∞; when paper obstruction occurs, the distance sensing probe 603 can detect the normal distance parameter. This change in the state signal can be regarded as the change of the level signal from "0" to "1"). Let the positions of the several distance sensing probes 603 distributed from top to bottom be {W1 W2 W3...W... n Let there be n angles {α1α2α3...α} in the tilt position of the high-position air pipe component 7. n}, among which, α1, α2, α3,..., α n The upward tilt angle decreases sequentially.

[0038] exist: When the distance sensor 603 at any position detects a paper obstruction signal, the high-position air tube 7 rotates to the upward tilt angle position corresponding to the position of the distance sensor 603. The priority of the upward tilt angle position at the low position is higher than that at the high position. That is, there are two distance sensor 603s that require composite paper obstruction signals, corresponding to the two upward tilt angle positions of the high-position air tube 7. The position action of the upward tilt angle position at the low position is executed first.

[0039] The third step involves multiple distance sensing probes 603 that have already detected the paper obstruction signal simultaneously detecting the distance information at the corresponding positions. Let the distance information detected by the multiple distance sensing probes 603 from top to bottom be {S1 S2 S3...S}. m}

[0040] If the distance information detected by the lowest position distance sensor 603 is not the minimum value among all distance information, then there is a paper arching difference (e.g. Figure 2 In the middle, the paper appears arched, which is actually an arc shape. ΔS=S m -S min , of which S min It is the minimum distance information detected by multiple distance sensing probes 603.

[0041] Let the air outlet velocity of the high-position air pipe 7 be F(V), then the air outlet velocity F(V) ∝ ΔS. A large paper arching difference makes it easy for the paper to curl inwards when it falls onto the bracket 206. Increasing the air outlet velocity blows air onto the leading edge of the paper, which to some extent "straightens" the paper and reduces the paper arching difference.

[0042] Fourth step, combine Figure 3 , Figure 4 When the distance sensing probe 603 at the lowest position in the side detection component 6 detects a paper obstruction signal (e.g. Figure 3 When the paper is positioned and the distance sensor 603 detects the orientation, the high-position air tube 7 stops blowing air, and the high-position rotation mechanism 8 drives the high-position air tube 7 to rotate upward to the "high-position initial position". At the same time, the low-position air tube 9, which is in the "low-position initial position", begins to expel air. The low-position rotation mechanism 10 drives the low-position air tube 9 to rotate upward at a constant speed to a certain angle and then stops rotating. When the paper slides down to the bracket 206, the low-position air tube 9 tilts and blows air, continuously "blowing" the front end of the paper forward into place. At the same time, an "air film" is formed between the front end of the paper and the upper surface of the stationary paper below, reducing the "friction" between the front end of the new paper and the paper below, and protecting the offset color pattern that has just been printed on the paper below.

[0043] Fifth step, combine Figure 5 After the first directional detector 5 fails to detect the paper obstruction signal downwards, the low-position air tube 9 stops blowing air, and the low-position rotation mechanism 10 drives the low-position air tube 9 to rotate downwards back to the "low-position initial position".

[0044] In addition, in this invention, the second orientation detector 604 detects the height of the paper stack on the bracket 206. When there is a small amount of paper, the servo motor 201 below drives the output shaft 202 to rotate. The relative rotation of the threaded section 203 and the threaded cylinder 205 adjusts the bracket 206 upward. As the paper stack increases, the servo motor 201 can also drive the bracket 206 to descend linearly. In this way, the top layer of paper is kept at a certain height. At the same time, the downward adjustment device 301 adjusts the position of the lifting baffle 302 and the sliding angle plate 303 according to the paper stack and the height position of the bracket 206, in coordination with the falling and collection of newly produced paper.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A paper collection device for double-sided offset printing, characterized in that: The system includes a discharge base frame (1), on which a paper discharge mechanism (4) and a paper discharge port (401) are arranged. The inner perimeter of the discharge base frame (1) is provided with a paper tray assembly (2) and a sliding stop assembly (3). The paper tray assembly (2) includes a bracket (206) and a servo motor (201) for driving and adjusting the height of the bracket (206). The sliding stop assembly (3) includes a lifting baffle (302) and a sliding adjustment device (301) for driving and adjusting the height of the lifting baffle (302). The upper end of the lifting baffle (302) is provided with a slope angle plate (303). The paper outlet side of the discharge base frame (1) is equipped with a first directional detector (5) that probes vertically downwards, wherein the first directional detector (5) is located above the paper outlet (401). The paper outlet (401) of the discharge base frame (1) is fixedly configured with a side position detection component (6) on the opposite side. The side position detection component (6) is configured with a number of distance sensing probes (603) with the sensing direction tilted towards the paper outlet (401) and a second position detector (604) with vertical downward sensing. The discharge base frame (1) is provided with a high-position air pipe (7) and a low-position air pipe (9) below the paper outlet (401). The high-position air pipe (7) is located above the low-position air pipe (9). The discharge base frame (1) is provided with a high-position rotation mechanism (8) for driving and adjusting the rotation angle of the high-position air pipe (7) and a low-position rotation mechanism (10) for driving and adjusting the rotation angle of the low-position air pipe (9).

2. The paper collection device for double-sided offset printing according to claim 1, characterized in that: The servo motor (201) is equipped with an output shaft (202) at its output end. The output shaft (202) has a threaded section (203). The bracket (206) is fixedly connected to the bottom of the lifting frame (204). The bottom of the lifting frame (204) is provided with a threaded cylinder (205). The threaded section (203) of the output shaft (202) is screwed onto the threaded cylinder (205).

3. The paper collection device for double-sided offset printing according to claim 1, characterized in that: The bracket (206) has a longitudinal slot (207), and the lifting baffle (302) moves through the longitudinal slot (207).

4. The paper collection device for double-sided offset printing according to claim 1, characterized in that: Among the several distance sensing probes (603), the horizontal position of the highest distance sensing probe (603) is higher than the horizontal position of the paper outlet (401).

5. The paper collection device for double-sided offset printing according to claim 1, characterized in that: The side detection component (6) includes a fixed bracket (601) fixedly connected to the inner wall of the discharge base frame (1), the second orientation detector (604) is fixedly installed at the position of the fixed bracket (601), the side end of the fixed bracket (601) is vertically connected to the inclined side plate (602), and a number of distance sensing probes (603) are installed in the area below the inclined side plate (602).

6. The paper collection device for double-sided offset printing according to claim 1, characterized in that: The discharge base frame (1) is equipped with a side ventilation network (11) located on the opposite side of the high-level air pipe (7) and the low-level air pipe (9).

7. A method for collecting paper output from offset printing, characterized in that, The paper collection device for offset printing according to any one of claims 1 to 6 includes the following steps: S1. When the first directional detector (5) does not detect paper output downwards, the high-position rotation mechanism (8) drives the high-position air pipe (7) to rotate to the "high-position initial position", and the low-position rotation mechanism (10) drives the low-position air pipe (9) to rotate to the "low-position initial position". S2. The paper feeding mechanism (4) starts feeding paper. The first position detector (5) detects the feeding status. Several distance sensing probes (603) are activated to detect the obstruction signal at the front end of the paper. Suppose that a number of distance sensing probes (603) are distributed from top to bottom in the following positions: {W1 W2 W3 ... W... n }; Suppose that there are n angles {α1α2α3...α} in the tilt position of the high-position air pipe fitting (7) during rotation. n }, among which, α1, α2, α3,..., α n The upward tilt angle decreases sequentially; Then it exists: That is, when the distance sensor probe (603) at any position detects the paper blocking signal, the high-position air tube (7) rotates to the upper tilt angle position corresponding to the position of the distance sensor probe (603), wherein the upper tilt angle position at the low position has a higher priority than the upper tilt angle position at the high position. S3. Multiple distance sensing probes (603) that have detected the paper obstruction signal simultaneously detect the distance information at the corresponding positions. Let the distance information detected by the multiple distance sensing probes (603) from top to bottom be {S1 S2 S3...S}. m }; If the distance information detected by the lowest position distance sensor (603) is not the minimum value among all distance information, then there exists a paper arching difference ΔS = S m -S min , among which, S min The minimum distance information detected by multiple distance sensing probes (603); Let the air outlet velocity of the high-level air pipe fitting (7) be F(V), then the air outlet velocity F(V) ∝ ΔS; S4. When the distance sensor probe (603) at the lowest position in the side detection component (6) detects the paper blocking signal, the high-position air tube (7) stops blowing air, and the high-position rotation mechanism (8) drives the high-position air tube (7) to rotate upward to the "high-position initial position". At the same time, the low-position air tube (9) in the "low-position initial position" starts to emit air, and the low-position rotation mechanism (10) drives the low-position air tube (9) to rotate upward at a constant speed to a certain angle and then stops rotating. S5. After the first directional detector (5) fails to detect the paper obstruction signal downwards, the low-position air tube (9) stops blowing air, and the low-position rotation mechanism (10) drives the low-position air tube (9) to rotate downwards to the "low-position initial position".

Images