Paper stack automatic leveling device and paper conveying machine

Abstract

The invention provides an automatic paper stack leveling device and a paper conveying machine, comprising a detection assembly for detecting the edge position of a paper stack, first support frames arranged on the two sides of the detection assembly, a lifting control assembly close to the first support frames and located at the discharge position of the front end of the paper stack, and a paper stack support table arranged at the bottom of the detection assembly in parallel and used for bearing the paper stack, the paper stack height detection assembly is arranged on the side, away from the paper stack supporting table, of the detection assembly and used for detecting the height position of the paper stack, and the detection assembly comprises a lifting frame connected with the first supporting frame, an edge detection set arranged on the surrounding edge of the lifting frame and used for detecting the edge flatness of the paper stack, and a plurality of lifting assemblies arranged close to the edge detection set; the horizontal position of the edge of the paper stack is scanned through the edge detection set, the lifting assembly is correspondingly awakened to lift the paper stack lower than the scanning area, so that leveling of the paper stack is achieved, manual intervention is not needed in the process, and the non-stop and high-efficiency paper conveying effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the printing technical field, in particular to a paper stack automatic leveling device and a paper feeder. BACKGROUND

[0002] The paper feeder (Feeder) in the printing machine, commonly known as Feeder, contains paper stack, Feeder head and other devices, is a very important part of modern printing machine, its role is to automatically, accurately and smoothly send the paper to the positioning or printing device according to certain rules. The paper stack generally stores 5000-10000 paper sheets, which are separated and sent away by the Feeder one by one.

[0003] The banknote paper is different from the ordinary paper in its material and has metal wires. The hardness and thickness of the metal wires exceed those of the paper itself. After stacking to a certain number, the metal wire part is obviously higher than other parts, and the surface appears obvious wave shape. The low part of the wave shape is lower than the lower limit of the paper feeder, which causes the paper feeder to fail to normally transport the paper out. Therefore, it is necessary to manually use a stick, wedge and other devices to make the low point and the high point of the paper stack top flat, so as to ensure that the lowest point of the paper stack top surface is above the lower limit of the paper feeder. This requires a person to frequently adjust, which has high labor intensity and is easy to cause abnormal shutdown. SUMMARY

[0004] Therefore, the present application aims to provide a paper stack automatic leveling device and a paper feeder to fundamentally solve the problem that the banknote paper leveling needs to manually use a stick, wedge and other devices to make the low point and the high point of the paper stack top flat, which has high labor intensity and is easy to cause abnormal shutdown.

[0005] According to the paper stack automatic leveling device of the present application, the detection assembly is used to detect the position of the paper stack edge, the first support frame is arranged on both sides of the detection assembly, the rising control assembly is arranged close to the first support frame and at the front end of the paper stack, the paper stack support table is arranged in parallel at the bottom of the detection assembly and used to support the paper stack, and the paper stack height detection assembly is arranged on the side of the detection assembly away from the paper stack support table and used to detect the height position of the paper stack.

[0006] Further, the detection assembly includes the lifting frame connected with the first support frame, the edge detection group arranged at the surrounding edge of the lifting frame and used to detect the edge flatness of the paper stack, and the multiple lifting assemblies arranged close to the edge detection group and electrically connected with the edge detection group.

[0007] Further, the rising control assembly comprises a plurality of lifting assemblies arranged close to the edge detection group and electrically connected with the edge detection group.

[0008] Further, the rising control assembly comprises a second support frame arranged between the two first support frames, a material guide rod arranged on the top of the second support frame and parallel to the lifting frame, and at least three front edge detection members arranged on the material guide rod.

[0009] Further, the edge detection group comprises at least two rear edge detection members arranged opposite to the front edge detection members, first side edge detection members arranged close to the two first support frames, and at least two second side edge detection members arranged opposite to the first side edge detection members.

[0010] Further, the lifting assembly is provided with six lifting assemblies corresponding to the two first side edge detection members, the two second side edge detection members and the two rear edge detection members.

[0011] Further, the lifting assembly comprises a cylinder fixedly connected with the lifting frame, an edge limiting part arranged on one side of the cylinder and facing the paper stack, and a lifting member arranged at the bottom of the cylinder and vertically to the edge limiting part.

[0012] Further, the lifting member comprises an output rod arranged vertically to the cylinder, and a lifting arm extending from the output rod and facing the paper stack, and the included angle between the lifting arm and the paper stack is 15°-30°.

[0013] Further, the paper stack height detection assembly comprises a fixed box arranged on the top of the lifting frame and close to one side of the rear edge detection member, a first paper feeder height detection member and a second paper feeder height detection member arranged on the top of the fixed box, and a FIDA foot paper amount detection member arranged on one side of the fixed box and facing the second side edge detection member, and the horizontal position of the first paper feeder height detection member is higher than that of the second paper feeder height detection member.

[0014] In addition, the application further provides a paper feeder, which comprises the paper stack automatic leveling device arranged on the paper feeder.

[0015] Compared with the prior art: the paper stack automatic leveling device in the above embodiment of the present application scans the horizontal position of the edge of the paper stack through the edge detection group, and the lifting assembly is awakened to implement the lifting operation on the paper stack below the scanning area, so as to realize the leveling of the paper stack, without manual intervention, and with the non-stop and efficient paper conveying effect, the paper processing production efficiency is greatly improved, and the problem that the leveling of the current banknote paper needs manual use of a strip, a wedge and the like to make the low point and the high point of the paper stack flush, which has large labor intensity and is easy to cause shutdown is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 Part structure schematic diagram of the paper stack automatic leveling device and the paper stack in the embodiment of the present application; Fig. 2 Part structure schematic diagram of the paper stack automatic leveling device in the embodiment of the present application; Fig. 3 Part structure schematic diagram of the detection assembly in the paper stack automatic leveling device in the embodiment of the present application; Fig. 4 Part structure schematic diagram of the lifting assembly in the paper stack automatic leveling device in the embodiment of the present application.

[0017] Main element symbol explanation:

[0018] The following specific embodiments will further illustrate the present application in combination with the above drawings. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0022] Referring to Figs. 1 to 4 , the automatic paper stack leveling device in the embodiment of the application is shown, which comprises a detection assembly 4 for detecting the height of the edge of the paper stack 6, a first support frame 1 arranged on both sides of the detection assembly 4, a lifting control assembly 2 arranged close to the first support frame 1 and at the front end of the paper stack 6, a paper stack support table 3 arranged in parallel at the bottom of the detection assembly 4 for bearing the paper stack 6, and a paper stack height detection assembly 5 arranged on the side of the detection assembly 4 away from the paper stack support table 3 for detecting the height position of the paper stack 6. The detection assembly 4 comprises a lifting frame 41 connected with the first support frame 1, an edge detection group arranged at the surrounding edge of the lifting frame 41 for detecting the flatness of the edge of the paper stack 6, and a plurality of lifting assemblies 45 arranged close to the edge detection group and electrically connected with the edge detection group. The edge of the paper stack 6 is scanned by the edge detection group, and the lifting assemblies 45 corresponding to the edge detection group are awakened to implement lifting operation on the surface paper of the paper stack 6 below the scanning area, so as to realize leveling of the paper stack 6.

[0023] Further, the lifting control assembly 2 comprises a second support frame 21 arranged between the two first support frames 1, a guide rod 22 arranged on the top of the second support frame 21 and in line with the lifting frame 41, and at least three front edge detection pieces 23 arranged on the guide rod 22, the edge detection group comprises at least two rear edge detection pieces 44 arranged opposite to the front edge detection pieces 23, a first side edge detection piece 42 arranged near one side of the two first support frames 1, and at least two second side edge detection pieces 43 arranged opposite to the first side edge detection piece 42, the lifting assembly 45 is provided with six in total and corresponds to the two first side edge detection pieces 42, the two second side edge detection pieces 43 and the two rear edge detection pieces 44 respectively, the lifting assembly 45 comprises a cylinder 451 fixedly connected with the lifting frame 41, an edge limiting portion 452 arranged on the side of the cylinder 451 towards the paper stack 6, and a lifting piece arranged on the bottom of the cylinder 451 and perpendicular to the edge limiting portion 452, the lifting piece comprises an output rod 453 arranged perpendicular to the cylinder 451, and a lifting arm 454 extending out of the output rod 453 towards the direction close to the paper stack 6, the included angle between the lifting arm 454 and the paper stack 6 is 15°-30°, the paper stack height detection assembly 5 comprises a paper stack height detection piece 51 arranged on the top of the lifting frame 41 and close to the side of the rear edge detection piece 44, a first fly head height detection piece 52 and a second fly head height detection piece 53 arranged on the top of the paper stack height detection piece 51, a fly foot paper amount detection piece 54 arranged on the side of the paper stack height detection piece 51 towards the second side edge detection piece 43, and a second fly foot paper amount detection piece 55 arranged close to the fly foot paper amount detection piece 54, the horizontal position of the first fly head height detection piece 52 is higher than that of the second fly head height detection piece 53.

[0024] It should be noted that the paper conveying path in the paper stack 6 is the first path from the paper stack support table 3 to the paper stack height detection assembly 5, the second path is the direction of the paper stack height detection assembly 5 to the upward control assembly 2, and the detection member provided in the present application can adopt an optical sensor and a distance sensor, wherein the optical sensor is 13, which is respectively used for the front edge detection member 23 for detecting the wave-shaped low point of the front edge of the paper stack, 3 (including 1 sensor provided in the present application), 6 for detecting the height of the side edge and the rear edge (respectively, two first edge detection members 42, two second side edge detection members 43, and two rear edge detection members 44), 2 for detecting the height of the fly head (respectively, a first fly head height detection member 52 and a second fly head height detection member 53), and 2 for detecting the amount of paper stepped on by the fly foot (respectively, a fly foot paper stepping amount detection member 54 and a second fly foot paper stepping amount detection member 55); and 1 distance control device (paper stack height detection member 51) for detecting the height of the paper stack, and further, the distance sensor provided in the paper stack height detection member 51 is in contact with the surface of the paper stack 6, so as to determine the height of the paper stack according to the distance between the paper stack height detection member 51 and the paper stack support table 3, and determine the number of papers in the paper stack 6 based on the thickness of a single paper.

[0025] Further, for the paper stack 6 front edge lifting control device, due to the existence of metal wires and sizing, etc., the paper stack will be uneven after a certain amount of stacking, and if the front edge of the paper stack 6 is lower than the paper stop plate, the paper feeding will be blocked, and the front edge of the paper stack 6 will be wavy due to unevenness. To solve this problem, the application is equipped with a photoelectric sensor, that is, a front edge detection piece 23 independently arranged on the lifting control assembly 2 at the middle position of the guide rod 22, but it cannot meet the requirements of paper deformation, therefore, one front edge detection piece 23 is added on each side to avoid paper feeding being blocked due to the low-lying of the front edge of the paper on both sides 1 / 3, and increase the redundancy. In some optional embodiments, the two added front edge detection pieces 23 can be adjusted in position on the guide rod 22 according to the deformation of each type of paper to increase the adaptability of the equipment to the products, at the same time, the two newly added front edge detection pieces 23 also need to be matched with the corresponding lifting assembly 45, and are connected in series with the PLC, which controls the lifting of the paper stack 6, and when the three front edge detection pieces 23 first detect the paper signal, the automatic leveling device starts to work. Specifically, the height of the wavy low point of the front edge of the paper stack 6 is detected, and when it is detected that the front edge of the paper stack 6 is lower than the photoelectric position of the front edge detection piece 23 (i.e. the lower limit position of the paper feeding machine, slightly lower than the PLC, the photoelectric control sends a signal to the PLC controller, and the PLC controller drives the lifting assembly 45 according to the control algorithm to make the paper stack 6 on the paper feeding machine rise as a whole, ensuring that the lowest point of the paper stack front edge is slightly lower than the paper stop plate. It should be noted that the lifting control of the paper feeding machine, that is, the process of transporting the top paper stack 6 upward by the paper stack support table 3 controlled by the second support frame 21, in some optional embodiments, the transmission between the second support frame 21 and the paper stack support table 3 can be chain driven lifting or gear and rack driven lifting, which can be understood by those skilled in the art. In addition, in some optional embodiments of the application, the PLC controller can be installed at any position convenient for the operator to operate on the paper feeding machine, and the PLC controller can also be an MCU (Microcontroller Unit; microcontroller unit) chip to realize the control of the whole paper feeding machine. The PLC controller and the paper feeding machine are electrically connected, and the electrical connection includes wired connection and wireless connection, and the wireless connection includes but is not limited to Bluetooth connection, WiFi, IF radio frequency, zigbee, and the wired connection includes but is not limited to the network communication line connecting the paper feeding machine and the PLC controller.

[0026] Further, the side edge and rear edge detection members and the lifting control are installed at the top of the paper stack 6 to detect the height of the paper stack 6 in real time and perform corresponding adjustment actions. Specifically, when the height of the paper stack 6 is lower than the positions of the detection areas covered by the first side edge detection member 42, the second side edge detection member 43 and the rear edge detection member 44, the corresponding lifting assembly 45 is controlled by the PLC controller according to the control algorithm to perform the lifting operation on the top 200-500 product papers of the paper stack 6 until the height of the lifted paper stack 6 is higher than the lower limit position of the lifting control device. In addition, it should be noted that the height is directly detected from the side of the paper stack 6, and the detection height is slightly higher than the paper blocking plate to ensure that the paper feeding on the side of the paper stack 6 is not disturbed.

[0027] For the control and use of the paper stack height detection assembly 5, the fly head height control device is used to detect the height position of the fly head in real time. When the corresponding lifting assembly 45 beside the current edge detection member 23 lifts the paper stack 6, the fly head will rise and fall with the height of the presser foot. The lower the presser foot, the lower the fly head, and vice versa. The presser foot is a component for pressing the top paper of the paper stack 6, commonly known as a "presser foot" in the industry and is arranged in the paper stack height detection member 51. According to the actual production situation, the fly head height is controlled within ±10mm for optimal and stable paper feeding. Therefore, the fly operator needs to use the wedge adjustment pad to control the fly head within ±10mm at the middle position of the rear edge of the paper stack 6, and the first fly head height detection member 52 and the second fly head height detection member 53 detect the top end cover to feed back signals to the PLC controller, which controls the presser foot to press the bottom paper stack 6. In addition, the lifting assembly 45 is used to replace the wooden wedge to automatically lift the paper stack, and the lifting height needs to be reasonably controlled. Therefore, the first fly head height detection member 52 is installed above the fly head with a horizontal height greater than the vertical distance of 20mm between the two control devices of the second fly head height detection member 53. When the first fly head height detection member 52 detects data, it indicates that the fly head and the paper stack are too high, and the lifting assembly 45 needs to retreat to lower the fly head height. If the second fly head height detection member 53 detects a signal, it indicates that the fly head height is too low, and the lifting assembly 45 needs to advance to raise the fly head height. According to the detection state, the fly head height is always maintained within ±10mm.

[0028] Finally, for the actual operation of the lifting assembly 45, after the PLC controller receives the corresponding signal sent by the adjacent adaptive edge detection piece, the cylinder 451 wakes up the output rod 453 at the bottom to drive the lifting arm 454 to tilt and lift up. It should be noted that the output rod 453 is inclined towards the paper stack 6 at an angle of 60°, and the angle between the lifting arm 454 and the paper stack 6 is 15°-30°. The angle design can avoid the problem that the lifting arm 454 directly inserts into the paper stack 6 in the transverse direction, causing damage to the edge of the paper, and finally completes the lifting operation on the corresponding edge of the paper stack 6, and finally completes the leveling of the paper stack 6.

[0029] In summary, the paper stack automatic leveling device in the above-mentioned embodiments of the present application scans the horizontal position of the edge of the paper stack 6 by the edge detection group, and wakes up the lifting assembly 45 to implement the lifting operation on the paper stack 6 below the scanning area, to realize the leveling of the paper stack 6. In the process, no manual intervention is required, and the paper conveying effect is efficient without stopping, greatly improving the paper processing production efficiency, solving the problem that the current banknote paper leveling needs to use a stick, wedge and other devices to align the low point and high point of the paper stack, which has high labor intensity and is easy to cause downtime.

[0030] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above-described embodiments only express several embodiments of the present application, which are described in detail and in detail, but cannot be understood as limiting the scope of the present patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A paper stack automatic leveling device, characterized in that: It includes a detection assembly for detecting the edge position of the paper stack, a first support frame arranged on both sides of the detection assembly, an ascending control assembly close to the first support frame and located at the front end discharge of the paper stack, a paper stack support platform arranged parallel to the bottom of the detection assembly for supporting the paper stack, and a paper stack height detection assembly arranged on the side of the detection assembly away from the paper stack support platform for detecting the height position of the paper stack.

2. The automatic paper stack leveling device according to claim 1, characterized in that: The detection assembly includes a lifting frame connected to the first support frame, an edge detection group arranged at the edge of the lifting frame for detecting the flatness of the edge of the paper stack, and a plurality of lifting assemblies arranged near the edge detection group, and the lifting assembly is electrically connected to the edge detection group.

3. The automatic paper stack leveling device according to claim 2, characterized in that: The lifting control assembly includes multiple lifting assemblies positioned near the edge detection group and electrically connected to the edge detection group. The edge detection group scans the horizontal position of the paper stack edge and, in response to feedback, activates the lifting assembly to lift any paper stack below the scanning area, thereby achieving leveling. The lifting control assembly utilizes a dual-power mechanism comprised of motors or cylinders, providing relay control of the paper stack at all times.

4. The automatic paper stack leveling device according to claim 3, characterized in that: The lifting control assembly includes a second support frame arranged between the two first support frames, a material guide rod arranged on the top of the second support frame and parallel to the lifting frame, and at least three front edge detection members arranged on the material guide rod.

5. The automatic paper stack leveling device according to claim 4, characterized in that: The edge detection group includes at least two rear edge detection members arranged opposite to the front edge detection member, first side edge detection members respectively arranged near the two first support frames, and at least two second side edge detection members arranged opposite to the first side edge detection members.

6. The automatic paper stack leveling device according to claim 5, characterized in that: The lifting assemblies are provided with six in total, and respectively correspond to the two first side edge detection members, the two second side edge detection members and the two rear edge detection members.

7. The automatic paper stack leveling device according to claim 6, characterized in that: The lifting assembly includes a cylinder fixedly connected to the lifting frame, an edge limiter arranged along the cylinder toward one side of the paper stack, and a lifting member arranged at the bottom of the cylinder and perpendicular to the edge limiter.

8. The automatic paper stack leveling device according to claim 7, characterized in that: The lifting member includes an output rod vertically arranged with respect to the cylinder, and a lifting arm extending along the output rod toward the paper stack, wherein the angle between the lifting arm and the paper stack is 15° to 30°.

9. The automatic paper stack leveling device according to claim 8, characterized in that: The paper stack height detection assembly includes a fixed box located on the top of the lifting frame and close to the rear edge detection member, a first paper feeder height detection member and a second paper feeder height detection member arranged on the top of the fixed box, and a feeder presser foot paper amount detection member arranged on the side of the fixed box facing the second side edge detection member, and the first paper feeder height detection member is horizontally positioned higher than the second paper feeder height detection member.

10. A paper feeder, characterized in that: The automatic paper stack leveling device comprising any one of claims 1 to 9 is arranged on the paper feeder.

Images