A paper collecting device and method for offset paper printing

Abstract

The present invention discloses a paper collection device and method for offset paper printing, and relates to the field of printing technology. In the present invention: a first azimuth detector for vertically downward detection is arranged on one side of the paper outlet of the discharging base, wherein the first azimuth detector is located above the paper outlet. A side detection assembly is fixedly arranged on the opposite side of the paper outlet of the discharging base, and the side detection assembly is equipped with a plurality of distance sensing probes whose sensing detection directions are inclined toward the direction of the paper outlet and a second azimuth detector for vertically downward sensing. A high-level air pipe fitting and a low-level air pipe fitting are arranged below the paper outlet of the discharging base, and the high-level air pipe fitting is located above the low-level air pipe fitting. The discharging base is equipped with a high-level rotating mechanism for driving and adjusting the rotation angle of the high-level air pipe fitting and a low-level rotating mechanism for driving and adjusting the rotation angle of the low-level air pipe fitting. The present invention avoids the front end of the discharged paper from rolling inward during the falling process, thereby reducing the degree of influence of the front end of the discharged paper on the printing on the surface of the paper below.

Description

Technical Field

[0001] The present invention relates to the field of printing technology, and in particular to a device and method for collecting offset paper printed on the printed paper. Background Art

[0002] Offset paper is mainly used for printing higher-end color prints on lithographic (offset) printing presses or other printing presses. It is suitable for printing monochrome or multi-color book covers, texts, inserts, pictorials, maps, posters, color trademarks and various packaging products.

[0003] When printing on offset paper, the paper naturally droops due to its own weight, and falls in an overall arched shape. When the front end of the paper falls on the support bracket or the upper side of the existing paper, it may sometimes "roll inward" or "turn over". In addition, the front end of the paper will scratch the upper surface of the collected paper, which may have adverse effects on some offset printings that are 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 offset paper printing, so as to avoid the front end of the paper from curling inward during the falling process, thereby reducing the influence of the front end of the paper on the printing surface of the paper below.

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

[0006] The present invention provides a paper collection device for offset paper printing, comprising a discharge base frame, a paper discharge mechanism and a paper discharge outlet disposed on the upper portion of the discharge base frame, and a paper support assembly and a downward sliding stop assembly disposed within the discharge base frame. The paper support assembly comprises a bracket and a servo motor for driving and adjusting the height of the bracket. The downward sliding stop assembly comprises a lifting baffle and a downward sliding adjustment device for driving and adjusting the height of the lifting baffle, wherein the lifting baffle is provided with a sliding angle plate at the upper end. A first azimuth detector for vertically downward detection is disposed on one side of the paper discharge outlet of the discharge base frame, wherein the first azimuth detector is located above the paper discharge outlet. A side position detection assembly is fixedly disposed on the opposite side of the paper discharge outlet of the discharge base frame, wherein the side position detection assembly is equipped with a plurality of distance sensing probes whose sensing directions are inclined toward the paper discharge outlet, and a second azimuth detector for vertically downward sensing. A high-position air pipe fitting and a low-position air pipe fitting are arranged below the paper outlet of the discharging base frame. The high-position air pipe fitting is located above the low-position air pipe fitting. The discharging base frame is equipped with a high-position rotating mechanism for driving and adjusting the rotation angle of the high-position air pipe fitting and a low-position rotating mechanism for driving and adjusting the rotation angle of the low-position air pipe fitting.

[0007] As an optimal technical solution of the offset paper printing paper collection device of the present invention: an output shaft is configured at the output end of the servo motor, 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 barrel, and the threaded section of the output shaft is screwed at the position of the threaded barrel.

[0008] As a preferred technical solution of the offset paper printing and collecting device of the present invention, the bracket is provided with a longitudinal slot, and the lifting baffle movably passes through the longitudinal slot.

[0009] As a preferred technical solution of the offset paper printing paper collecting device of the present invention: the horizontal position of the highest distance sensor probe among the plurality of distance sensor probes is higher than the horizontal position of the paper outlet.

[0010] As an optimal technical solution of the offset paper printing paper collection device of the present invention: the side position detection component includes a fixed bracket fixedly connected to the inner wall of the discharge base frame, the second orientation detector is fixedly installed at the position of the fixed bracket, the side end of the fixed bracket is vertically connected to the inclined side substrate, and a plurality of distance sensing probes are installed in the oblique lower area of the oblique side substrate.

[0011] As a preferred technical solution of the offset paper printing paper collecting device of the present invention: the discharge base frame is equipped with a side ventilation net located at the opposite side of the high-position air pipe component and the low-position air pipe component.

[0012] The present invention provides a method for collecting offset paper printed on a paper sheet, and the specific method steps are as follows:

[0013] S1. When the first orientation detector does not detect paper output downward, the high-position rotating mechanism drives the high-position air pipe to rotate to the "high initial position", and the low-position rotating mechanism drives the low-position air pipe to rotate to the "low initial position".

[0014] S2, the paper discharging mechanism starts discharging paper, the first position detector detects the paper discharging state, and several distance sensor probes are activated to detect the blocking signal of the front end position of the paper discharging. Assume that the positions of the several distance sensor probes from top to bottom are {W1 W2 W3...W n Assume that there are n angles {α1α2α3...α n}, among which, α1, α2, α3,..., α n The upward tilt angle decreases successively. Then there exists: That is, when the distance sensing probe at any position detects a paper blocking signal, the high-position air pipe component rotates to the upper tilt angle position corresponding to the position of the distance sensing probe, wherein the priority of the upper tilt angle position at the low position is higher than the priority of the upper tilt angle position at the high position.

[0015] S3, multiple distance sensor probes that have detected the paper blocking signal synchronously detect the distance information of the corresponding position. Suppose the distance information detected by the multiple distance sensor probes from top to bottom is {S1 S2 S3...S m If the distance information detected by the lowest position distance sensor probe is not the minimum value among all the distance information, there is a paper arch difference ΔS=S m -S min , where S min is the minimum value of the distance information detected by multiple distance sensor probes. Assume that the air outlet velocity of the high-level air pipe is F(V), then the air outlet velocity F(V)∝ΔS.

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

[0017] S5. After the first position detector detects no paper blocking signal downward, the low-position air pipe assembly stops blowing air, and the low-position rotating mechanism drives the low-position air pipe assembly to rotate downward to the "low-position initial position" again.

[0018] Compared with the existing technology, the beneficial effects of the present invention are:

[0019] During the paper discharge process, the present invention uses a side detection component to perform real-time sensing detection on the movement state of the discharged paper, and uses a high-level air pipe component to dynamically blow air at the front end of the discharged paper in terms of position and force, so as to prevent the front end from curling inward when the discharged paper falls. The low-level air pipe component also performs "airflow pushing" on the front end of the discharged paper, and also forms an air film between the discharged paper and the paper below, thereby reducing the influence of the front end of the discharged paper on the printing surface of the paper below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the paper collecting device for offset paper printing according to the present invention.

[0021] Figure 2 This is a schematic diagram of the paper discharging mechanism of the present invention when discharging paper.

[0022] Figure 3 This is a schematic diagram of the present invention when the discharged paper reaches the lowest position of the distance sensor probe.

[0023] Figure 4 This is a schematic diagram of the low-position air pipe component of the present invention during blowing.

[0024] Figure 5This is a schematic diagram of the low-position air pipe component of the present invention when it stops blowing and resets.

[0025] Among them: 1-discharging base; 2-paper support assembly, 201-servo motor, 202-output shaft, 203-threaded segment, 204-lifting frame, 205-threaded cylinder, 206-bracket, 207-vertical slot; 3-sliding gear assembly, 301-sliding adjustment device, 302-lifting baffle, 303-slide angle plate; 4-paper discharge mechanism, 401-paper discharge port; 5-first azimuth detector; 6-side detection assembly, 601-fixed bracket, 602-oblique side base plate, 603-distance sensor probe, 604-second azimuth detector; 7-high-position air pipe fittings; 8-high-position rotating mechanism; 9-low-position air pipe fittings; 10-low-position rotating mechanism; 11-side ventilation net; 12-double-sided printing paper. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0027] Example 1

[0028] See also Figure 1 The present invention relates to a paper collecting device for offset paper printing, the specific structure and configuration of which are as follows:

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

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

[0031] The side position detection assembly 6 is fixedly mounted on the side opposite the paper outlet 401 of the discharging base frame 1. The side position detection assembly 6 includes a fixed bracket 601 and an inclined side base plate 602. The fixed bracket 601 is fixedly connected to the inner wall of the discharging base frame 1. The inclined side base plate 602 is tilted and vertically fixed to the side end of the fixed bracket 601. The second azimuth detector 604 is fixedly mounted on the fixed bracket 601. The second azimuth detector 604 senses vertically downward (the second azimuth detector 604 can be a photoelectric distance sensor). Several distance sensing probes 603 are mounted on the oblique lower area of the inclined side base plate 602. The sensing direction of the several distance sensing probes 603 is tilted toward the paper outlet 401. 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.

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

[0033] The inner periphery of the discharge base frame 1 is equipped with a downward movement stop assembly 3, which includes a downward movement adjustment device 301, a lifting baffle 302, and a sliding angle plate 303. The downward movement adjustment device 301 is used to drive and adjust the height of the lifting baffle 302, and the sliding angle plate 303 is located at the upper side of the lifting baffle 302. The bracket 206 is provided with a longitudinal slot 207 with a structural dimension that matches the lifting baffle 302, and the lifting baffle 302 can move through the longitudinal slot 207.

[0034] Example 2

[0035] The present invention relates to a method for collecting offset paper printed on a paper shelf, and the specific steps are as follows:

[0036] In the first step, when the first position detector 5 does not detect the paper being discharged downward, the high position rotating mechanism 8 drives the high position air pipe 7 to rotate to the "high position initial position" (such as Figure 1 The high-position air pipe member 7 is at the maximum upward inclination position within the rotatable range), and the low-position rotating mechanism 10 drives the low-position air pipe member 9 to rotate to the "low initial position" (such as Figure 1 The middle and low position air pipe parts 9 are at the maximum downward inclination angle position within the rotatable range).

[0037] The second step is to combine Figure 2 , the paper discharging mechanism 4 starts discharging paper, the first orientation detector 5 detects the paper discharging state, and a plurality of distance sensing probes 603 are started to detect the blocking signal of the front end position of the paper being discharged (the function of the distance sensing probe 603 itself is to detect the distance, but when there is no paper blocking, the distance signal detected by the distance sensing probe 603 exceeds its own detection distance parameter, and it can also be considered that the detected distance is ∞. When paper blocking 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"). Assume that the positions of the plurality of distance sensing probes 603 distributed from top to bottom are {W1 W2 W3...W n Assume that there are n angles {α1α2α3...α n}, among which, α1, α2, α3,..., α n The upward inclination angle decreases successively.

[0038] exist: That is, when the distance sensing probe 603 at any position detects a paper blocking signal, the high-position air pipe fitting 7 rotates to the upper tilt angle position corresponding to the position of the distance sensing probe 603, wherein the priority of the upper tilt angle position at the low position is higher than the priority of the upper tilt angle position at the high position, that is, if there are two distance sensing probes 603 required by the composite paper blocking signal, corresponding to the two upper tilt angle positions of the high-position air pipe fitting 7, the position action of the upper tilt angle at the low position is executed first.

[0039] In the third step, the multiple distance sensor probes 603 that have detected the paper blocking signal synchronously detect the distance information of the corresponding position. Suppose the distance information detected by the multiple distance sensor probes 603 from top to bottom is {S1 S2 S3...S m}.

[0040] If the distance information detected by the lowest position distance sensor probe 603 is not the minimum value among all the distance information, there is a paper arch difference (for example Figure 2 In the figure, the paper is arched, which is actually an arc) ΔS=S m -S min , where S min is the minimum value of the distance information detected by the multiple distance sensing probes 603.

[0041] Assuming the airflow rate of high-position air pipe 7 is F(V), then the airflow rate F(V) ∝ΔS. A large paper arch difference can easily cause the paper to curl inward when it lands on bracket 206. Increasing the airflow rate and blowing air toward the leading edge of the exiting paper can somewhat "straighten" the exiting paper and reduce the paper arch difference.

[0042] Step 4: Combine Figure 3 、 Figure 4 When the distance sensor probe 603 at the lowest position in the side detection component 6 detects a paper blocking signal (for example Figure 3 When the paper slides down onto the bracket 206, the low-position air pipe 9 starts to rotate upward at a constant speed until it reaches a certain angle and then stops. When the paper slides down onto the bracket 206, the low-position air pipe 9 starts to blow air at an angle, continuously "blowing" the front end of the paper forward into position. At the same time, a "thin 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, thus protecting the newly printed offset color pattern on the paper below.

[0043] Step 5: Combine Figure 5 After the first orientation detector 5 detects no paper blocking signal downward, the low-position air pipe component 9 stops blowing air, and the low-position rotating mechanism 10 drives the low-position air pipe component 9 to rotate downward to the "low initial position" again.

[0044] Furthermore, in the present invention, a second position detector 604 detects the height of the paper stack on the carriage 206. When there is less paper, the servo motor 201 below drives the output shaft 202 to rotate. The relative rotation of the threaded segment 203 and the threaded barrel 205 adjusts the carriage 206 upward. As the paper stack increases, the servo motor 201 also drives the carriage 206 linearly downward, thereby ensuring that the top layer of paper is at a certain height. Simultaneously, the downward adjustment device 301 adjusts the position of the lifting baffle 302 and the sliding angle plate 303 based on the paper stack and the height of the carriage 206, facilitating the drop and collection of newly ejected 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 in the scope of protection of the present invention.

Claims

1. A paper collection device for offset paper printing, characterized by: The invention comprises a discharging base frame (1), wherein the upper portion of the discharging base frame (1) is provided with a paper discharging mechanism (4) and a paper discharging port (401), and the inner periphery of the discharging base frame (1) is provided with a paper support assembly (2) and a downward sliding gear assembly (3), wherein the paper support assembly (2) comprises a bracket (206) and a servo motor (201) for driving and adjusting the height position of the bracket (206), and the downward sliding gear assembly (3) comprises a lifting baffle (302) and a downward sliding adjustment device (301) for driving and adjusting the height position of the lifting baffle (302), wherein the upper side end of the lifting baffle (302) is provided with a sliding angle plate (303); A first azimuth detector (5) for vertically detecting downwards is provided on one side of the paper outlet of the discharge base frame (1), wherein the first azimuth detector (5) is located above the paper outlet (401); A side position detection assembly (6) is fixedly arranged on the opposite side of the paper outlet (401) of the discharging base frame (1), and the side position detection assembly (6) is equipped with a plurality of distance sensing probes (603) whose sensing detection directions are inclined toward the paper outlet (401) and a second direction detector (604) that senses and detects vertically downwards; The horizontal position of the highest distance sensing probe (603) among the plurality of distance sensing probes (603) is higher than the horizontal position of the paper outlet (401); The side position detection assembly (6) includes a fixed bracket (601) fixedly connected to the inner wall of the discharge base frame (1), the second position 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 base plate (602) arranged obliquely, and a plurality of distance sensing probes (603) are installed in the oblique lower area of the inclined side base plate (602); A high-position air pipe component (7) and a low-position air pipe component (9) are arranged below the paper outlet (401) of the discharging base frame (1); the high-position air pipe component (7) is located above the low-position air pipe component (9); and the discharging base frame (1) is provided with a high-position rotating mechanism (8) for driving and adjusting the rotation angle of the high-position air pipe component (7) and a low-position rotating mechanism (10) for driving and adjusting the rotation angle of the low-position air pipe component (9).

2. The paper collecting device for offset paper printing according to claim 1, characterized in that: The output end of the servo motor (201) is provided with an output shaft (202), the output shaft (202) is provided with a threaded section (203), the bottom side of the bracket (206) is fixedly connected to the lifting frame (204), the bottom of the lifting frame (204) is provided with a threaded barrel (205), and the threaded section (203) of the output shaft (202) is screwed to the threaded barrel (205).

3. The paper collecting device for offset paper printing according to claim 1, characterized in that: The bracket (206) is provided with a longitudinal slot (207), and the lifting baffle (302) moves through the longitudinal slot (207).

4. The paper collecting device for offset paper printing according to claim 1, characterized in that: The discharge base frame (1) is provided with a side ventilation net (11) located at the opposite side of the high-position air pipe component (7) and the low-position air pipe component (9).

5. A method for collecting offset paper printed on paper, characterized in that: The paper collecting device for offset paper printing according to any one of claims 1 to 4 comprises the following steps: S1. When the first orientation detector (5) does not detect paper discharge in the downward direction, the high-position rotating mechanism (8) drives the high-position air pipe component (7) to rotate to the "high-position initial position", and the low-position rotating mechanism (10) drives the low-position air pipe component (9) to rotate to the "low-position initial position"; S2, the paper discharge mechanism (4) starts to discharge paper, the first position detector (5) detects the paper discharge state, and a plurality of distance sensing probes (603) are activated to detect the blocking signal of the front end position of the discharged paper; Assume that the positions of a number of distance sensor probes (603) distributed from top to bottom are ; Assume that there are n angles in the inclination position of the high-position air pipe (7) rotation ,in, The upward inclination angle decreases successively; Then there exists: , that is, when the distance sensing probe (603) at any position detects a paper blocking signal, the high-position air pipe component (7) rotates to an upper tilt angle position corresponding to the position of the distance sensing probe (603), wherein the priority of the upper tilt angle position at the low position is higher than the priority of the upper tilt angle position at the high position; S3. Multiple distance sensing probes (603) that have detected the paper blocking signal synchronously detect the distance information of the corresponding positions. Suppose the distance information detected by the multiple distance sensing probes (603) from top to bottom is ; If the distance information detected by the lowest position distance sensing probe (603) is not the minimum value among all the distance information, there is a paper arch difference. ,in, is the minimum value of distance information detected by the multiple distance sensing probes (603); Assume that the air outlet rate of the high-position air pipe (7) is , then the air outlet rate ; S4. When the distance sensor probe (603) at the lowest position in the side detection assembly (6) detects a paper blocking signal, the high-position air pipe component (7) stops blowing air, and the high-position rotating mechanism (8) drives the high-position air pipe component (7) to rotate upward to the "high initial position". At the same time, the low-position air pipe component (9) at the "low initial position" starts to discharge air, and the low-position rotating mechanism (10) drives the low-position air pipe component (9) to rotate upward at a constant speed to a certain angle and then stops rotating; S5. After the first orientation detector (5) detects no paper blocking signal downward, the low-position air pipe component (9) stops blowing air, and the low-position rotating mechanism (10) drives the low-position air pipe component (9) to rotate downward to the "low-position initial position" again.

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