Winding and unwinding device and digital paper printing machine

Abstract

The embodiment of the present application relates to the technical field of printing equipment, and provides a take-up and pay-off device and a digital paper printing machine, the take-up and pay-off device comprising a pay-off assembly, a take-up assembly, a first sensing member and a controller, the pay-off assembly comprising a pay-off shaft for winding paper and a first driving member connected to the pay-off shaft; the first sensing member is used for detecting the radius of the wound paper of the pay-off shaft; the controller is electrically connected to the first sensing member and the first driving member; the take-up and pay-off device provided by the embodiment of the present application measures the radius of the wound paper on the pay-off shaft in real time by using the first sensing member, the data measured by the first sensing member is transmitted to the controller through an electric signal, and the controller can control the first driving member to drive the pay-off shaft to adjust the rotating speed in real time, so that the transmission speed of the paper during pay-off tends to be stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing equipment, and particularly provides a winding and unwinding device and a digital paper printing machine. BACKGROUND

[0002] In the textile printing industry, the existing paper printing machine is usually a small machine. The small machine generally unwinds a small roll of paper, and the step length of the small machine is short and the paper feeding speed is slow. In batch production, the output of the small machine is low, so the roll changing during unwinding is not very frequent, and thus the small machine can meet the low production demand.

[0003] However, the current industry tends to be high-yield production mode, and thus a large machine in the form of industry is needed. The existing small machine has a short step length, a small unwinding roll diameter, and a slow paper feeding speed, and thus cannot meet the high requirements of industrial equipment on step precision, printing speed, step length, unwinding diameter, and the neatness of winding. In addition, the unwinding diameter of the small machine is small (usually about 300 mm), and the diameter of the roll of paper has little effect on the unwinding speed, while the unwinding diameter of the industrial equipment is large (usually more than 1000 mm), and the diameter of the roll of paper has a great effect on the unwinding speed. Therefore, the winding and unwinding device used by the small machine cannot meet the needs of the industrial equipment. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a winding and unwinding device and a digital paper printing machine, which can adjust the unwinding speed of the unwinding shaft according to the radius of the wound paper on the unwinding shaft to ensure the smooth unwinding of the paper.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application provide a winding and unwinding device applied to a digital paper printing machine. The winding and unwinding device comprises an unwinding assembly, a winding assembly, a first sensing member, and a controller. The unwinding assembly comprises an unwinding shaft for winding paper and a first driving member connected to the unwinding shaft. The first sensing member is used to detect the radius of the wound paper on the unwinding shaft. The controller is electrically connected to the first sensing member and the first driving member.

[0007] The winding and unwinding device provided by the embodiments of the present application measures the radius of the wound paper on the unwinding shaft in real time by using the first sensing member. The data measured by the first sensing member is transmitted to the controller through an electrical signal. The controller can control the first driving member to drive the unwinding shaft to adjust the rotating speed in real time, so that the transmission speed of the paper during unwinding tends to be stable.

[0008] In one embodiment, the winding and unwinding device further comprises:

[0009] The printing device body is arranged between the unwinding assembly and the winding assembly;

[0010] The traction mechanism is arranged on the side of the printing device body, and is used for intermittently pulling the paper;

[0011] The unwinding tension adjusting assembly is arranged between the printing device body and the unwinding shaft, and is used for adjusting the tension of the paper;

[0012] The winding tension adjusting assembly is arranged between the printing device body and the winding assembly, and is used for adjusting the tension of the paper.

[0013] In one embodiment, the traction mechanism comprises a first traction shaft, a second traction shaft and a second driving member, the first traction shaft is arranged at the feeding end of the printing device body, the second traction shaft is arranged at the discharging end of the printing device body, the second driving member is connected to the first traction shaft and the second traction shaft, the second driving member is electrically connected to the printing device body, and the printing device body is electrically connected to the controller.

[0014] In one embodiment, the unwinding tension adjusting assembly comprises an unwinding rotating rod, an unwinding swing arm and an unwinding swing rod, the unwinding swing rod is connected to the unwinding rotating rod through the unwinding swing arm, the unwinding swing rod abuts against the paper and is used for tightening the paper, and the unwinding swing rod can rotate around the unwinding rotating rod;

[0015] The winding tension adjusting assembly comprises a winding swing rod, a winding swing arm and a winding rotating rod, the winding swing rod is connected to the winding rotating rod through the winding swing arm, the winding swing rod abuts against the paper and is used for tightening the paper, and the winding swing rod can rotate around the winding rotating rod.

[0016] In one embodiment, the winding tension adjusting assembly further comprises a tension adjusting member, a plurality of connecting members are arranged on the winding swing arm, the plurality of connecting members are distributed on the winding swing arm along the radial direction of the winding swing rod rotation, and the tension adjusting member is connected to any one of the connecting members and is used for applying an action force for overcoming gravity to the winding swing arm.

[0017] In one embodiment, the unwinding tension adjusting assembly further comprises a second sensing member, the second sensing member is arranged on the unwinding rotating rod and is used for detecting the rotation angle of the unwinding swing rod; and the second sensing member is electrically connected to the controller.

[0018] In one embodiment, the rotation speed V1 of the unwinding shaft is

[0019]

[0020] Wherein, M is the rotation speed of the traction shaft, P is the radius of the wound paper on the unwinding shaft measured by the first sensing member, Y1 is the rotation angle of the unwinding swing rod measured by the second sensing member, and K is the adjustment coefficient.

[0021] In one embodiment, the winding tension adjusting assembly further comprises a third sensing member arranged on the winding rotating rod and used for detecting the rotating angle of the winding swing rod; the third sensing member is electrically connected to the controller.

[0022] In one embodiment, the winding assembly comprises a winding shaft and a second driving member connected to the winding shaft, the second driving member being electrically connected to the controller; the rotating speed V2 of the winding shaft is

[0023]

[0024] wherein, M is the rotating speed of the traction shaft, P is the radius of the paper wound on the unwinding shaft measured by the first sensing member, Y2 is the rotating angle of the unwinding swing rod measured by the third sensing member, and K is an adjusting coefficient.

[0025] In a second aspect, the embodiments of the present application further provide a digital printing machine, which comprises the winding and unwinding device as described above.

[0026] The digital printing machine provided by the embodiments of the present application has better printing effect and winding and unwinding effect of paper because the winding and unwinding device can adjust the rotating speed of the unwinding shaft driven by the first driving member based on the data measured by the first sensing member to make the transmission speed of the paper unwinding tend to be stable. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0028] Figure 1 The working flowchart of the winding and unwinding device provided by the embodiments of the present application;

[0029] Figure 2 The structural schematic diagram of the unwinding tension adjusting assembly and the winding tension adjusting assembly provided by the embodiments of the present application;

[0030] Figure 3 The sectional view of the unwinding tension adjusting assembly and the winding tension adjusting assembly provided by the embodiments of the present application.

[0031] In the drawings, various reference signs represent:

[0032] 100, winding and unwinding device; 200, paper; 10, unwinding assembly; 11, unwinding shaft; 20, winding assembly; 21, winding shaft; 30, first sensing member; 40, printing device body; 50, traction mechanism; 51, first traction shaft; 52, second traction shaft; 60, unwinding tension adjusting assembly; 61, unwinding rotating rod; 62, unwinding swing arm; 63, unwinding swing rod; 64, second sensing member; 70, winding tension adjusting assembly; 71, winding rotating rod; 72, winding swing arm; 721, connecting piece; 73, winding swing rod; 74, tension adjusting member; 75, third sensing member. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0034] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0036] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the textile printing industry, the existing paper feeding machine is usually a small machine. The small machine generally unwinds the paper from a small roll, and the step length of the small machine is short and the paper feeding speed is slow. In batch production, the output of the small machine is low, so the roll changing operation during unwinding is not very frequent, and it can meet the low production demand. However, the current industry tends to be high-yield production mode, so it needs to be large-scale machinery in industrial form. The existing small machine has short step length, small unwinding roll diameter and slow paper feeding speed, which cannot meet the high requirements of industrial equipment on step precision, printing speed, step length, unwinding diameter and winding neatness. In addition, the unwinding diameter of the small machine is small (usually about 300mm), and the diameter of the roll paper has little effect on the unwinding speed, while the unwinding diameter of the industrial equipment is large (usually more than 1000mm), and the diameter of the roll paper has a great effect on the unwinding speed, so the winding and unwinding device used by the small machine cannot meet the needs of industrial equipment.

[0038] Therefore, the embodiment of the present application provides a winding and unwinding device and a digital paper feeding machine, which can adjust the unwinding speed of the unwinding shaft according to the radius of the wound paper on the unwinding shaft to ensure the smooth unwinding of the paper.

[0039] Please refer to Figures 1 to 3 , in a first aspect, the embodiment of the present application provides a winding and unwinding device 100 applied in a digital paper feeding machine, the winding and unwinding device 100 comprises an unwinding assembly 10, a winding assembly 20, a first sensing member 30 and a controller (not shown in the figure), the unwinding assembly 10 comprises an unwinding shaft 11 for winding paper 200, and a first driving member (not shown in the figure) connected to the unwinding shaft 11; the first sensing member 30 is used for detecting the radius of the wound paper 200 around the unwinding shaft 11; the controller is electrically connected to the first sensing member 30 and the first driving member.

[0040] It can be understood that the paper 200 is wound on the unwinding shaft 11 for the unwinding assembly 10 to continuously unwind the paper 200; after the paper 200 is unwound from the unwinding shaft 11, the printing operation is performed, and then the winding assembly 20 is used for winding to complete the paper feeding work.

[0041] In the actual operation process, the diameter of the wound paper formed by winding the paper 200 on the unwinding shaft 11 is generally more than 1000mm, and in the process of driving the unwinding shaft 11 to rotate by the first driving member, the unwinding speed of the paper 200 unwound from the wound paper is related to the diameter of the wound paper, that is, the larger the diameter of the wound paper, the faster the speed of the paper 200 unwound from the wound paper. Therefore, by arranging the first sensing member 30, the first sensing member 30 is used to measure the radius of the wound paper in real time, and the first sensing member 30 sends the measured data to the controller, so that the controller controls the rotating speed of the unwinding shaft 11 driven by the first driving member according to the current radius of the wound paper, so that the unwinding speed of the unwinding shaft 11 tends to be stable.

[0042] Specifically, during unwinding, the radius of the wound paper on the unwinding shaft 11 gradually decreases as the unwinding proceeds, so the controller gradually increases the rotation speed of the first driving member driving the unwinding shaft 11 as the unwinding proceeds, to offset the effect of the decrease in the radius of the wound paper on the speed of the unwound paper 200.

[0043] The first sensing member 30 can be a distance sensor, an infrared sensor, etc., and measures the radius of the wound paper on the unwinding shaft 11 in the radial direction of the unwinding shaft 11. The first driving member can be a stepper motor, and the controller controls the output rotation speed of the stepper motor. The controller can be a PID controller (Proportion Integration Differentiation), which adjusts the rotation speed of the first driving member according to the measured data.

[0044] The unwinding and winding device 100 provided by the embodiments of the present application measures the radius of the wound paper 200 on the unwinding shaft 11 in real time using the first sensing member 30, and transmits the measured data to the controller through an electrical signal. The controller controls the first driving member to adjust the rotation speed of the unwinding shaft 11 in real time, so that the transmission speed of the paper 200 during unwinding tends to be stable.

[0045] Please refer to Figures 1 to 3 In one embodiment, the unwinding and winding device 100 further comprises a printing device body 40, a traction mechanism 50, an unwinding tension adjusting assembly 60, and a winding tension adjusting assembly 70. The printing device body 40 is arranged between the unwinding assembly 10 and the winding assembly 20. The traction mechanism 50 is arranged on the side of the printing device body 40, and is used to intermittently pull the paper 200. The traction mechanism 50 pulls the paper 200 to the printing device body 40, and the printing device body 40 performs a printing operation on the paper 200. After the operation is completed, the traction mechanism 50 pulls the paper 200 forward again, so that the printed part of the paper 200 moves forward, and the subsequent part of the paper 200 that has not been printed moves to the printing device body 40 for printing. The traction mechanism 50 intermittently pulls the paper 200, so that the paper 200 can be intermittently printed on the printing device body 40.

[0046] The unwinding tension adjusting assembly 60 is arranged between the printing device body 40 and the unwinding shaft 11, and is used to adjust the tension of the paper 200. The winding tension adjusting assembly 70 is arranged between the printing device body 40 and the winding assembly 20, and is used to adjust the tension of the paper 200. It can be understood that, since the first driving member continuously drives the unwinding shaft 11 to rotate, that is, the unwinding shaft 11 continuously unwinds the paper 200, and the traction mechanism 50 intermittently pulls the paper 200, by arranging the unwinding tension adjusting assembly 60 between the printing device body 40 and the unwinding shaft 11, the unwinding tension adjusting assembly 60 is used to press the paper 200 to keep it in a tight state, so as to avoid the uneven tension of the paper 200 caused by the walking and stopping of the paper 200, and enable the unwinding shaft 11 to continuously rotate to perform the unwinding operation, so as to protect the mechanical transmission of the unwinding shaft 11. After the printing of the paper 200 on the printing device body 40 is completed, the paper 200 is removed from the device body by the traction mechanism 50 in an intermittent manner. In order to avoid the uneven tension of the paper 200 caused by the walking and stopping of the paper 200. Similarly, the winding tension adjusting assembly 70 is arranged between the printing device body 40 and the winding assembly 20, and the winding tension adjusting assembly 70 is used to press the paper 200 to keep it in a tight state.

[0047] Please refer to Figures 1 to 3 In an embodiment, the traction mechanism 50 includes a first traction shaft 51, a second traction shaft 52, and a second driving member (not shown in the figure). The first traction shaft 51 is arranged at the feeding end of the printing device body 40, the second traction shaft 52 is arranged at the discharging end of the printing device body 40, the second driving member is connected to the first traction shaft 51 and the second traction shaft 52, the second driving member is electrically connected to the printing device body 40, and the printing device body 40 is electrically connected to the controller. The printing device body 40 is used to control the second driving member, so that the second driving member drives the first traction shaft 51 and the second traction shaft 52 to pull and transport the paper 200 for printing. The second driving member can be a stepping motor, which is used to drive the first traction shaft 51 and the second traction shaft 52 to rotate. The second driving member is controlled by the printing device body 40, so that the second driving member controls the pulling and transporting of the paper 200 according to the printing process of the printing device body 40.

[0048] Please refer to Figures 1 to 3 In an embodiment, the unwinding tension adjusting assembly 60 includes an unwinding rotating rod 61, an unwinding swing arm 62, and an unwinding swing rod 63. The unwinding swing rod 63 is connected to the unwinding rotating rod 61 through the unwinding swing arm 62, abuts against the paper 200, and is used to tighten the paper 200. The unwinding swing rod 63 can rotate around the unwinding rotating rod 61. It can be understood that the unwinding swing rod 63 abuts against and presses on the paper 200 according to its own gravity, so that the paper 200 is kept tight.

[0049] The unwinding shaft 11 is kept rotating by the driving of the first driving member to continuously unwind the paper wound on the unwinding shaft 11, while the traction mechanism 50 intermittently pulls the paper 200. When the traction mechanism 50 is in the stop state, the paper between the first traction shaft 51 and the unwinding shaft 11 will be increased and accumulated, at this time the unwinding swing rod 63 will be rotated downward according to its own gravity and continuously press the paper 200 to keep the paper 200 tight; when the traction mechanism 50 is in the traction state, the paper between the first traction shaft 51 and the unwinding shaft 11 will be reduced, at this time the unwinding swing rod 63 is pressed on the paper 200 according to its own gravity, and the paper 200 will also reduce the degree of hanging in the process of reduction, that is, the paper 200 will lift the unwinding swing rod 63 upward. In summary, during the entire process of the intermittent traction of the paper 200 by the traction mechanism 50, the unwinding swing rod 63 will alternately rotate upward and downward to apply a force to the paper 200 in real time to keep the paper 200 tight.

[0050] The winding tension adjusting assembly 70 includes a winding swing rod 73, a winding swing arm 72 and a winding rotating rod 71, the winding swing rod 73 is connected to the winding rotating rod 71 through the winding swing arm 72, the winding swing rod 73 abuts against the paper 200 and is used to tighten the paper 200, and the winding swing rod 73 can rotate around the winding rotating rod 71. It can be understood that the winding swing rod 73 abuts against and presses on the paper 200 according to its own gravity to keep the paper 200 tight.

[0051] The winding assembly 20 continuously winds the paper 200, while the traction mechanism 50 intermittently pulls the paper 200.

[0052] When the traction mechanism 50 is in the traction state, the second traction shaft 52 sends the printed paper 200 out of the printing main body device and transmits it to the winding assembly 20, the paper between the second traction shaft 52 and the winding assembly 20 will be increased and accumulated, at this time the winding swing rod 73 will be rotated downward according to its own gravity and continuously press the paper 200 to keep the paper 200 tight; when the traction mechanism 50 is in the stop state, since the winding assembly 20 still keeps winding operation, the paper between the second traction shaft 52 and the winding shaft will be reduced, at this time the winding swing rod 73 is pressed on the paper 200 according to its own gravity, and the paper 200 will also reduce the degree of hanging in the process of reduction, that is, the paper 200 will lift the winding swing rod 73 upward. In summary, during the entire process of the intermittent traction of the paper 200 by the traction mechanism 50, the winding swing rod 73 will alternately rotate upward and downward to apply a force to the paper 200 in real time to keep the paper 200 tight.

[0053] Please refer to Figures 1 to 3In one embodiment, the winding tension adjusting assembly 70 further comprises a tension adjusting member 74, and the winding swing arm 72 is provided with a plurality of connecting members 721 distributed on the winding swing arm 72 along the radial direction of the winding swing rod 73, and the tension adjusting member 74 is connected to any one of the connecting members 721 and used to apply an action force to the winding swing arm 72 to overcome the gravity. It can be understood that when the printing device main body 40 prints the paper 200, the paper 200 will expand after the ink is printed on it; by providing the tension adjusting member 74 on the winding swing arm 72, the tension adjusting member 74 applies an action force to the winding swing arm 72 to support the winding swing arm 72 and the winding swing rod 73, thereby offsetting part of the gravity of the winding swing arm 72 and the winding swing rod 73, and the action force of the winding swing arm 72 on the printed paper is also reduced accordingly to meet the stress requirement of the tight printed paper. Specifically, the connecting member 721 in the embodiment is a connecting hole opened on the winding swing arm 72, and the tension adjusting member 74 can adopt a pneumatic cylinder, the main body part of the pneumatic cylinder is fixedly arranged, and the piston part of the pneumatic cylinder is connected to any one of the connecting holes.

[0054] Please refer to Figures 1 to 3 In one embodiment, the winding tension adjusting assembly 70 further comprises a tension adjusting member 74, and the winding swing arm 72 is provided with a plurality of connecting members 721 distributed on the winding swing arm 72 along the radial direction of the winding swing rod 73, and the tension adjusting member 74 is connected to any one of the connecting members 721 and used to apply an action force to the winding swing arm 72 to overcome the gravity. It can be understood that when the printing device main body 40 prints the paper 200, the paper 200 will expand after the ink is printed on it; by providing the tension adjusting member 74 on the winding swing arm 72, the tension adjusting member 74 applies an action force to the winding swing arm 72 to support the winding swing arm 72 and the winding swing rod 73, thereby offsetting part of the gravity of the winding swing arm 72 and the winding swing rod 73, and the action force of the winding swing arm 72 on the printed paper is also reduced accordingly to meet the stress requirement of the tight printed paper. Specifically, the connecting member 721 in the embodiment is a connecting hole opened on the winding swing arm 72, and the tension adjusting member 74 can adopt a pneumatic cylinder, the main body part of the pneumatic cylinder is fixedly arranged, and the piston part of the pneumatic cylinder is connected to any one of the connecting holes.

[0055] The rotation angle of the unwinding swing rod 63 can be detected by the second sensing member 64, and the accumulation degree of the paper 200 between the first traction shaft 51 and the unwinding shaft 11 can be determined; when the second sensing member 64 detects that the downward rotation angle of the unwinding swing rod 63 is too large, i.e. the paper 200 is accumulated too much between the first traction shaft 51 and the unwinding shaft 11, the controller can control the first driving member to reduce the rotation speed, so that the unwinding speed of the unwinding shaft 11 is reduced; when the second sensing member 64 detects that the upward rotation angle of the unwinding swing rod 63 is too large, i.e. the stock of the paper 200 between the first traction shaft 51 and the unwinding shaft 11 is too small, in order to avoid the problem of paper breakage, the controller can control the first driving member to increase the rotation speed, so that the unwinding speed of the unwinding shaft 11 is increased. At the same time, the rotation angle of the unwinding swing rod 63 can be measured by the second sensing member 64 to determine whether the paper breakage occurs. Specifically, the second sensing member 64 described above can adopt an angle sensor.

[0056] Please refer to Figures 1 to 3 In one embodiment, the rotation speed V1 of the unwinding shaft 11 is

[0057]

[0058] Wherein, M is the rotation speed of the traction shaft, P is the radius of the wound paper 200 on the unwinding shaft 11 measured by the first sensing member 30, Y1 is the rotation angle of the unwinding swing rod 63 measured by the second sensing member 64, and K is the adjustment coefficient.

[0059] The first driving member is controlled by the controller to drive the unwinding shaft 11 to unwind at the rotation speed V1, wherein the controller adjusts according to the rotation speed M of the traction shaft, the radius P of the wound paper 200 on the unwinding shaft 11 and the rotation angle Y1 of the unwinding swing rod 63. Specifically, the above-mentioned K is an adjustment coefficient for adjusting the overall speed of the unwinding shaft 11; K can be greater than 1 or less than 1, for example, when it is necessary to slow down the rotation speed V1 of the unwinding shaft 11, K less than 1 can be input to adjust; on the contrary, K greater than 1 can be input to increase the rotation speed V1 of the unwinding shaft 11.

[0060] Please refer to Figures 1 to 3In one embodiment, the winding tension adjusting assembly 70 further comprises a third sensing member 75 arranged on the winding rotating rod 71 and used for detecting the rotating angle of the winding swing rod 73; the third sensing member 75 is electrically connected to the controller. Since the winding swing rod 73 is used for pressing on the printed paper 200, when the traction mechanism 50 is in the traction state, the paper 200 will be accumulated between the second traction shaft 52 and the winding assembly 20, the winding swing rod 73 will press on the paper 200 according to the gravity and continuously rotate downward; when the traction mechanism 50 is in the traction suspension state, since the winding assembly 20 continuously performs the winding operation, the paper 200 between the second traction shaft 52 and the winding assembly 20 will be reduced, so that the degree of hanging of the paper 200 is smaller and smaller, i.e. the paper will lift the winding swing rod 63, so that the winding swing rod 63 rotates upward.

[0061] The third sensing member 75 can detect the rotating angle of the winding swing rod 73, and then judge the accumulation degree of the paper 200 between the second traction shaft 52 and the winding assembly 20; when the third sensing member 75 detects that the downward rotating angle of the winding swing rod 73 is too large, i.e. the paper 200 is accumulated too much between the second traction shaft 52 and the winding assembly 20, the controller can control the winding speed of the winding assembly 20 to increase; when the third sensing member 75 detects that the upward rotating angle of the winding swing rod 73 is too large, i.e. the stock of the paper 200 between the second traction shaft 52 and the winding assembly 20 is too small, in order to avoid the problem of paper breakage, the controller can control the winding speed of the winding assembly 20 to slow down. At the same time, the third sensing member 75 can also be used to judge whether the paper breakage phenomenon occurs by measuring the rotating angle of the winding swing rod 73. Specifically, the third sensing member 75 can adopt an angle sensor.

[0062] Please refer to Figures 1 to 3 In one embodiment, the winding assembly 20 comprises a winding shaft 21 and a second driving member (not shown in the figure) connected to the winding shaft 21, and the second driving member is electrically connected to the controller. The second driving member can adopt a stepping motor; the rotating speed V2 of the winding shaft 21 is

[0063]

[0064] Wherein, M is the rotating speed of the traction shaft, P is the radius of the paper 200 wound on the unwinding shaft 11 measured by the first sensing member 30, Y2 is the rotating angle of the winding swing rod 63 measured by the third sensing member 75, and K is an adjusting coefficient.

[0065] The controller is used for controlling the second driving member to drive the winding shaft 21 to rotate at the speed V2, wherein the controller adjusts according to the rotating speed M of the traction shaft, the radius P of the paper 200 wound on the unwinding shaft 11 and the rotating angle Y2 of the winding swing rod 73.

[0066] Please refer toFigures 1 to 3 Figures 1 to 3 In the second aspect, the embodiment of the present application also provides a digital paper printing machine comprising the winding and unwinding device 100 as described above. The digital paper printing machine provided by the embodiment of the present application has better printing effect and winding and unwinding effect of the paper 200, because it comprises the winding and unwinding device 100 as described above, and the winding and unwinding device 100 can adjust the rotating speed of the first driving member driving the unwinding shaft 11 according to the data measured by the first sensing member 30, so that the transmission speed of the paper 200 when unwinding tends to be stable.

[0067] The preferred embodiments of the present application have been described above with the preferred embodiments, but not to limit the embodiments of the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A winding and unwinding device applied in a digital paper printing machine, characterized in that, The winding and unwinding device comprises: an unwinding assembly comprising an unwinding shaft for winding paper and a first driving member connected to the unwinding shaft; a winding assembly; a first sensing member for detecting the radius of the paper wound on the unwinding shaft; a controller electrically connected to the first sensing member and the first driving member; a printing device body arranged between the unwinding assembly and the winding assembly; a traction mechanism arranged on the side of the printing device body, the traction mechanism being used for intermittently pulling the paper, the traction mechanism comprising a first traction shaft arranged at the inlet end of the printing device body, a second traction shaft arranged at the outlet end of the printing device body, and a second driving member connected to the first traction shaft and the second traction shaft, the second driving member being electrically connected to the printing device body, and the printing device body being electrically connected to the controller; an unwinding tension adjusting assembly arranged between the printing device body and the unwinding shaft and used for adjusting the tension of the paper, the unwinding tension adjusting assembly comprising an unwinding rotating rod, an unwinding swing arm and an unwinding swing rod, the unwinding swing rod being connected to the unwinding rotating rod through the unwinding swing arm, the unwinding swing rod abutting against the paper and being used for tightening the paper, and the unwinding swing rod being capable of rotating around the unwinding rotating rod, the unwinding tension adjusting assembly further comprising a second sensing member arranged on the unwinding rotating rod and used for detecting the rotation angle of the unwinding swing rod, the second sensing member being electrically connected to the controller; wherein the unwinding speed of the unwinding shaft can be adjusted by the rotation speed of the first traction shaft, the radius of the paper wound on the unwinding shaft detected by the first sensing member, and the rotation angle of the unwinding swing rod detected by the second sensing member, the unwinding speed of the unwinding shaft being configured to increase when the rotation angle of the unwinding swing rod increases, and the unwinding speed of the unwinding shaft being configured to slow down when the rotation angle of the unwinding swing rod decreases.

2. A roll-fed apparatus according to claim 1, wherein The winding and unwinding device further comprises: a winding tension adjusting assembly arranged between the printing device body and the winding assembly and used for adjusting the tension of the paper.

3. A roll-fed apparatus according to claim 2, wherein: The winding tension adjusting assembly comprises a winding swing rod, a winding swing arm and a winding rotating rod, the winding swing rod being connected to the winding rotating rod through the winding swing arm, the winding swing rod abutting against the paper and being used for tightening the paper, and the winding swing rod being capable of rotating around the winding rotating rod.

4. A roll-fed apparatus according to claim 3, wherein: The winding tension adjusting assembly further comprises a tension adjusting member, the winding swing arm being provided with a plurality of connecting members distributed on the winding swing arm along the radial direction of the rotation of the winding swing rod, and the tension adjusting member being connected to any one of the connecting members and being used for applying an action force for overcoming gravity to the winding swing arm.

5. A roll-fed apparatus according to claim 4, wherein: The rotation speed V1 of the unwinding shaft is Wherein, M is the rotating speed of the traction shaft, P is the radius of the paper wound on the unwinding shaft measured by the first sensing member, Y1 is the rotating angle of the unwinding swing rod measured by the second sensing member, and K is an adjusting coefficient.

6. The roll-fed apparatus of claim 4, wherein: The winding tension adjusting assembly further comprises a third sensing member arranged on the winding swing rod and used for detecting the rotating angle of the winding swing rod; the third sensing member is electrically connected to the controller.

7. A roll-fed apparatus according to claim 6, wherein: The winding assembly comprises a winding shaft and a second driving member connected to the winding shaft, the second driving member being electrically connected to the controller; the rotating speed V2 of the winding shaft is Wherein, M is the rotating speed of the traction shaft, P is the radius of the paper wound on the unwinding shaft measured by the first sensing member, Y2 is the rotating angle of the unwinding swing rod measured by the third sensing member, and K is an adjusting coefficient.

8. A digital sheet marking machine characterized by The winding and unwinding device comprises the winding and unwinding device according to any one of claims 1 to 7.

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