Print front edge transport system for sheet media

Abstract

The application relates to a printing front edge conveying system of plate-shaped medium. The printing front edge conveying system of plate-shaped medium comprises a three-way limiting device and a platform conveying device; the three-way limiting device is installed above the platform conveying device; the three-way limiting device comprises a left limiting mechanism, a right limiting mechanism, a middle limiting mechanism and a transverse connecting mechanism; the left limiting mechanism comprises a left baffle, a left sliding support, a left horizontal screw rod and a left mounting seat; the right limiting mechanism comprises a right baffle, a right sliding support, a right horizontal screw rod, a right screw rod sliding block, a right mounting seat and a right driver; the middle limiting mechanism is connected with the transverse connecting mechanism; the left baffle and the right baffle are placed opposite to each other and are respectively arranged on the two sides of the middle limiting mechanism; and the platform conveying device is used for adsorptively conveying the printing medium. The printing front edge conveying system of plate-shaped medium has the advantages of accurate limiting and stable conveying.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printing technology, in particular to a printing front edge conveying system of plate-shaped medium. BACKGROUND

[0002] In the field of printing technology, corresponding printing devices may be different according to the type of printing medium. For printing jobs of plate-shaped medium (such as paperboard, corrugated board, PVC board, etc.), each plate-shaped medium is usually transported one by one or one by one block, conveyed to the lower side of the printing device by the conveying device, and then printed by the printing device.

[0003] The printing medium conveying device or conveying device before the printing device is also called front edge conveying device because it is located before the process where the printing device is located.

[0004] The front edge conveying device of the prior art is realized by a conveying belt. In order to improve the conveying effect and stability, some technical solutions will open holes on the conveying belt and place negative pressure suction ports between the rings of the conveying belt, so that the open holes on the conveying belt form negative pressure. In this way, the printing medium placed on the conveying belt for transportation is adsorbed by the negative pressure and stably placed on the conveying belt and stably transported.

[0005] This front edge conveying technical solution has many problems, such as poor independence of conveying, only one printing medium can be transported on the same conveying belt each time; poor accuracy of conveying, it is not easy to realize the limiting of the printing medium; and high energy consumption of conveying, because a whole belt conveying device is used to convey one printing medium. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a printing front edge conveying system of plate-shaped medium, which has the advantages of independent conveying and energy saving.

[0007] In one aspect of the present application, a printing front edge conveying system of plate-shaped medium is provided, comprising a three-way limiting device and a platform type conveying device; the three-way limiting device is installed above the platform type conveying device;

[0008] The three-way limiting device comprises a left limiting mechanism, a right limiting mechanism, a middle limiting mechanism and a transverse connecting mechanism; the left limiting mechanism and the right limiting mechanism are respectively arranged on both sides of the middle limiting mechanism, and the left limiting mechanism, the right limiting mechanism and the middle limiting mechanism are respectively connected with the transverse connecting mechanism and synchronously lifted;

[0009] The left limiting mechanism comprises a left baffle, a left sliding bracket, a left horizontal screw rod and a left mounting seat;

[0010] The left baffle is mounted on the left sliding bracket, and the left sliding bracket is sleeved on the left horizontal lead screw; the left horizontal lead screw is mounted on the transverse connecting mechanism through the left mounting seat;

[0011] The right limiting mechanism includes a right baffle, a right sliding bracket, a right horizontal lead screw, a right lead screw slider, a right mounting base, and a right driver.

[0012] The right baffle is mounted on the right sliding bracket, the right sliding bracket is fixedly connected to the right lead screw slider, the right lead screw slider is sleeved on the right horizontal lead screw, the end of the right horizontal lead screw is connected to the right driver, and the right driver drives the right horizontal lead screw to rotate; the right horizontal lead screw is mounted on the transverse connecting mechanism through the right mounting base;

[0013] The intermediate limiting mechanism is connected to the transverse connecting mechanism;

[0014] The left baffle and the right baffle are placed facing each other and are respectively positioned on both sides of the intermediate limiting mechanism;

[0015] The platform-type conveyor is used for adsorption-type conveying of printing media.

[0016] The printing leading edge conveying system for plate-shaped media described in this application achieves three-directional limiting of the printing media by setting a three-way limiting device, and achieves negative pressure adsorption and independent transportation by setting a platform-type conveying device. Furthermore, the left and right baffles of the three-way limiting device limit the stacking of multiple stacked printing media, and then the gap between the three-way limiting device and the platform conveying device enables the sequential conveying of the printing media. To ensure the accuracy of sequential conveying of the printing media, the distance between the bottom surface of the three-way limiting device and the top surface of the platform conveying device is between one and two printing media thicknesses; in other words, this distance is greater than one printing media thickness but less than two printing media thicknesses, ensuring that only one printing media can be conveyed to the next process at a time, while the remaining printing media are stacked and limited by the three-way limiting device.

[0017] Furthermore, the intermediate limiting mechanism includes an intermediate baffle and an intermediate connecting block; the intermediate baffle is placed vertically, and the intermediate connecting block is installed on the back side of the intermediate baffle;

[0018] The intermediate connecting block is rotatably connected to the transverse connecting mechanism;

[0019] The left baffle and the right baffle are respectively placed on both sides of the middle baffle;

[0020] The bottom surfaces of the left baffle, the right baffle, and the middle baffle are flush.

[0021] Furthermore, the working surface of the intermediate baffle is a plane;

[0022] The working surface of the left baffle includes a left inclined surface and a left straight surface; a left horizontal line is formed at the junction of the left inclined surface and the left straight surface;

[0023] The working surface of the right baffle includes a right inclined surface, a right upper straight surface, and a right lower straight surface; the right inclined surface is located between the right upper straight surface and the right lower straight surface; a right upper horizontal line is formed at the junction of the right inclined surface and the right upper straight surface, and a right lower horizontal line is formed at the junction of the right inclined surface and the right lower straight surface.

[0024] In terms of height, the left horizontal line is located between the upper right horizontal line and the lower right horizontal line;

[0025] The left straight surface is parallel to the upper right straight surface, and is perpendicular to the working surface of the middle baffle.

[0026] Furthermore, the lateral connection mechanism includes a mounting back plate, a synchronous rotating shaft, a transmission wheel set, a vertical screw, and a connecting mounting base;

[0027] The mounting backplate is placed vertically;

[0028] One of the transmission wheel sets is placed in the middle, and the two synchronous rotating shafts are respectively placed on both sides of the transmission wheel set;

[0029] The synchronous shaft is placed horizontally, and one end of it is connected to the transmission wheel set; the two synchronous shafts are connected through the transmission wheel set and rotate synchronously.

[0030] The synchronous rotating shaft is mounted on the mounting back plate via the connecting mounting base;

[0031] The vertical screw is placed vertically and connected to the transmission wheel assembly to achieve transmission through the transmission wheel assembly and the synchronous rotating shaft; the end of the vertical screw is threadedly connected to the intermediate connecting block;

[0032] The left mounting bracket and the right mounting bracket are respectively mounted on the mounting back plate;

[0033] The driver drives the transmission wheel assembly to rotate, thereby causing the synchronous shaft and the vertical screw to rotate synchronously.

[0034] Furthermore, the right limiting mechanism also includes a right slider and a right limiting slide rail. The two right limiting slide rails are arranged in parallel and are respectively placed on the upper and lower sides of the right horizontal lead screw. The two right sliders are respectively installed on the right sliding bracket. The right slider is slidably connected to the right limiting slide rail, and the right slider and the right limiting slide rail are arranged in a one-to-one correspondence.

[0035] Furthermore, the left limiting mechanism also includes a left lead screw slider, a left slider, a left limiting slide rail, and a left driver;

[0036] The left lead screw slider is sleeved on the left horizontal lead screw and mounted on the left sliding bracket;

[0037] The two left limiting slide rails are arranged in parallel and are respectively placed on the upper and lower sides of the left horizontal lead screw; the two left sliders are respectively installed on the left sliding bracket; the left sliders are slidably connected to the left limiting slide rails; and the left sliders and the left limiting slide rails are arranged in a one-to-one correspondence.

[0038] The left actuator is rotatably connected to the end of the left horizontal lead screw, and drives the left horizontal lead screw to rotate through the left actuator.

[0039] Furthermore, the platform-type conveying device includes a support frame, a negative pressure housing, an active mechanism, and a driven mechanism;

[0040] The negative pressure housing is installed above the support frame, and the negative pressure housing has an internal cavity with a flat top surface.

[0041] The bottom of the negative pressure housing has a negative pressure communication port, and its top surface has multiple rectangular adsorption ports.

[0042] The active mechanism includes an active driver, an active shaft, an active pulley, and a belt drive assembly; the two ends of the active shaft are rotatably connected to the negative pressure housing, and the active pulley is sleeved on the active shaft; the active driver is connected to the active shaft through the belt drive assembly and drives the active shaft to rotate.

[0043] The active rotating wheel is placed inside the negative pressure housing and located at the adsorption port; the highest point of the active rotating wheel's stroke is higher than the top surface of the negative pressure housing;

[0044] Multiple active mechanisms are arranged in parallel;

[0045] The driven mechanism includes a driven shaft, a driven wheel, and a driven transmission assembly; the two ends of the driven shaft are rotatably mounted on the negative pressure housing and are arranged parallel to the drive shaft; the driven wheel is sleeved on the driven shaft and placed at the suction port; the highest point of the driven wheel's stroke is higher than the top surface of the negative pressure housing;

[0046] The driven shaft is connected to one of the driving shafts via the driven transmission assembly.

[0047] Furthermore, the driven transmission component is a belt synchronous transmission component or a ratchet transmission component.

[0048] Furthermore, the driven transmission assembly includes a driving ratchet, a driven ratchet, and a transmission chain;

[0049] The active ratchet is sleeved on one of its active shafts, and the driven ratchet is sleeved on the driven shaft; the active ratchet is connected to and drives the driven ratchet through the transmission chain.

[0050] Furthermore, the adsorption port is rectangular, and the rectangular adsorption port forms an adsorption gap with the active rotating wheel or the driven rotating wheel.

[0051] To better understand and implement this application, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0052] Figure 1 A front view of a printing leading edge delivery system for a plate-shaped medium, which is an example of this application;

[0053] Figure 2 A three-dimensional structural schematic diagram of a printing leading edge delivery system for a plate-shaped medium, which is an example of this application;

[0054] Figure 3 This is a three-dimensional structural diagram of an exemplary three-way limiting device of this application from one perspective;

[0055] Figure 4 This is a three-dimensional structural schematic diagram from another perspective of the exemplary three-way limiting device of this application;

[0056] Figure 5 This is a three-dimensional structural diagram illustrating the assembly relationship of the left limiting mechanism, right limiting mechanism, and middle limiting mechanism, which are exemplary embodiments of this application.

[0057] Figure 6 This is a three-dimensional structural diagram illustrating the assembly relationship between the lateral connecting mechanism and the intermediate limiting mechanism, which is an example of this application.

[0058] Figure 7 The working principle diagrams of the left baffle, right baffle, and middle baffle are exemplary in this application;

[0059] Figure 8 This is a schematic diagram illustrating the stacking relationship between the printing medium and the three-way limiting device, which is an example of this application.

[0060] Figure 9 This is a front view of an exemplary platform-type conveyor device of this application;

[0061] Figure 10 This is a three-dimensional structural diagram of an exemplary platform-type conveying device of this application;

[0062] Figure 11This is a three-dimensional structural diagram of an exemplary platform-type conveying device (with the top surface of the negative pressure housing removed) of this application;

[0063] Figure 12 This is a three-dimensional structural diagram illustrating the assembly relationship between the active and driven mechanisms, which is an example of this application. Detailed Implementation

[0064] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0065] Please see Figures 1-12 This application exemplifies a printing leading edge conveying system for plate-shaped media, including a three-way limiting device A and a platform conveying device B; the three-way limiting device A is installed above the platform conveying device B;

[0066] The three-way limiting device A includes a left limiting mechanism, a right limiting mechanism, a middle limiting mechanism, and a lateral connecting mechanism; the left limiting mechanism and the right limiting mechanism are respectively placed on both sides of the middle limiting mechanism, and the left limiting mechanism, the right limiting mechanism, and the middle limiting mechanism are respectively connected to the lateral connecting mechanism and move up and down synchronously;

[0067] The left limiting mechanism includes a left baffle 11, a left sliding bracket 12, a left horizontal lead screw 13, and a left mounting base 14;

[0068] The left baffle 11 is mounted on the left sliding bracket 12, and the left sliding bracket 12 is sleeved on the left horizontal lead screw 13; the left horizontal lead screw 13 is mounted on the transverse connecting mechanism through the left mounting seat 14;

[0069] The right limiting mechanism includes a right baffle 21, a right sliding bracket 22, a right horizontal lead screw 23, a right lead screw slider 26, a right mounting base 24, and a right driver 25;

[0070] The right baffle 21 is mounted on the right sliding bracket 22, and the right sliding bracket 22 is fixedly connected to the right lead screw slider 26. The right lead screw slider 26 is sleeved on the right horizontal lead screw 23, and the end of the right horizontal lead screw 23 is connected to the right driver 25, which drives the right horizontal lead screw 23 to rotate. The right horizontal lead screw 23 is mounted on the transverse connecting mechanism through the right mounting base 24.

[0071] The intermediate limiting mechanism is connected to the transverse connecting mechanism;

[0072] The left baffle 11 and the right baffle 21 are placed facing each other and are respectively positioned on both sides of the intermediate limiting mechanism;

[0073] The platform-type conveyor device B is used for adsorption-type conveying of printing media.

[0074] The printing leading edge conveying system for plate-shaped media described in this application achieves three-directional limiting of the printing media by setting a three-way limiting device A, and achieves negative pressure adsorption and independent transportation by setting a platform-type conveying device B. Furthermore, the left baffle 11 and right baffle 21 of the three-way limiting device A achieve stacking limiting of multiple stacked printing media, and then the gap between the three-way limiting device A and the platform conveying device enables the sequential conveying of printing media. To ensure the accuracy of sequential conveying of printing media, the distance between the bottom surface of the three-way limiting device A and the top surface of the platform-type conveying device B is between one and two printing media thicknesses; in other words, this distance is greater than one printing media thickness but less than two printing media thicknesses, ensuring that only one printing media can be conveyed to the next process at a time, while the remaining printing media are stacked and limited by the three-way limiting device A.

[0075] In some preferred embodiments, the bottom surface of the three-way limiting device A is parallel to the top surface of the platform conveyor B, and the height of the bottom surface of the three-way limiting device A from the top surface of the platform conveyor B is between one and two printing media thicknesses, so that the printing media are stacked at the three-way limiting device A. Only one printing media is delivered from the platform conveyor B at a time.

[0076] In some preferred embodiments, the intermediate limiting mechanism includes an intermediate baffle 31 and an intermediate connecting block 32; the intermediate baffle 31 is placed vertically, and the intermediate connecting block 32 is installed on the back side of the intermediate baffle 31.

[0077] The intermediate connecting block 32 is rotatably connected to the transverse connecting mechanism;

[0078] The left baffle 11 and the right baffle 21 are respectively placed on both sides of the middle baffle 31;

[0079] The bottom surfaces of the left baffle 11, the right baffle 21, and the middle baffle 31 are flush.

[0080] In this application, the left baffle 11 and the right baffle 21 limit the printing medium from both sides, and the middle baffle 31 limits the end of the printing medium in the forward direction. Therefore, the left baffle 11, the middle baffle 31 and the right baffle 21 limit the printing medium from three directions.

[0081] In some preferred embodiments, the working surface of the intermediate baffle 31 is a plane;

[0082] See Figure 7 , Figure 7 The dashed lines in the diagram indicate contour lines. The working surface of the left baffle 11 includes a left inclined plane C1 and a left straight plane C2. A left horizontal line is formed at the junction of the left inclined plane C1 and the left straight plane C2.

[0083] The working surface of the right baffle 21 includes a right inclined surface D2, a right upper straight surface D3, and a right lower straight surface D1; the right inclined surface D2 is located between the right upper straight surface and the right lower straight surface D1; a right upper horizontal line is formed at the junction of the right inclined surface D2 and the right upper straight surface D3, and a right lower horizontal line is formed at the junction of the right inclined surface D2 and the right lower straight surface D1;

[0084] In terms of height, the left horizontal line is located between the upper right horizontal line and the lower right horizontal line;

[0085] The left straight surface C2 is parallel to the upper right straight surface D3, and is perpendicular to the working surface of the middle baffle 31.

[0086] The aforementioned functional surfaces refer to the surfaces that provide a limiting function during operation. Furthermore, the functional surface of the middle baffle 31 is used to block the printing medium from advancing, while the functional surfaces of the left baffle 11 and right baffle 21 are used to limit the printing medium from two sides.

[0087] In some preferred embodiments, the height of the lower right face D1 is equal to the thickness of a printing medium. This ensures that only one printing medium can be placed flat on the lower right face D1 and the left face.

[0088] In this design, the left horizontal line is positioned between the upper right and lower right horizontal lines in terms of height. This means the left horizontal line is higher than the lower right horizontal line, and lower than the upper right horizontal line. This results in the left slope C1 and the right slope D2 being asymmetrical, but rather staggered.

[0089] Additionally, in use, the distance between the left straight surface C2 and the lower right straight surface D1 is greater than or equal to the limiting dimension of one printing medium. Typically, this distance is slightly larger than the specified dimension to ensure effective limiting. The limiting dimension here refers to the width of the printing medium when it is being transported along its length, and the length when it is being transported along its width.

[0090] When the distance between the left straight surface C2 and the right straight surface is within a certain limit dimension, the printing media at the bottom of the left baffle 11 and the right baffle 21 is in a flat state, the printing media between the left straight surface C2 and the right inclined surface D2 is in an inclined state, and the printing media at the upper right straight surface D3 is in a flat state. Therefore, the entire stacked printing media, between the two baffles, presents three different layered arrangements: the bottom flat state, the middle inclined state, and the top flat state. Figure 8 As shown, Figure 8 In the attached diagram, the identifier N indicates the printing medium.

[0091] This staggered arrangement prevents the entire weight of the printing media from pressing down on the bottommost medium. Consequently, the weight on the bottom one or two mediums is reduced, resulting in less weight on their upper surfaces and less relative friction between them. Ultimately, once the bottommost medium is transported away, the medium above it is less likely to be transported along with it, thus ensuring that only one medium is transported at a time with high accuracy.

[0092] In some preferred embodiments, the lateral connection mechanism includes a mounting back plate (not shown), a synchronous rotating shaft 41, a transmission wheel set 42, a vertical screw 43, and a connecting mounting base 44;

[0093] The mounting backplate is placed vertically;

[0094] The transmission wheel set 42 is placed in the middle, and the two synchronous rotating shafts 41 are respectively placed on both sides of the transmission wheel set 42;

[0095] The synchronous rotating shaft 41 is placed horizontally, and one end of it is connected to the transmission wheel set 42; the two synchronous rotating shafts 41 are connected through the transmission wheel set 42 and rotate synchronously.

[0096] The synchronous rotating shaft 41 is mounted on the mounting back plate via the connecting mounting base 44;

[0097] The vertical screw 43 is placed vertically and connected to the transmission wheel set 42 to achieve transmission through the transmission wheel set 42 and the synchronous rotating shaft 41; the end of the vertical screw 43 is threadedly connected to the intermediate connecting block 32.

[0098] The left mounting base 14 and the right mounting base 24 are respectively mounted on the mounting back plate;

[0099] The driver (not shown) drives the transmission wheel assembly 42 to rotate, thereby causing the synchronous shaft 41 and the vertical screw 43 to rotate synchronously.

[0100] The transmission wheel set 42 can adopt any of the existing technical solutions. The synchronous rotation of two shafts and a screw can be achieved through the transmission wheel set 42, which is a technical means that can be achieved by existing technology, and will not be elaborated here.

[0101] The lateral connecting mechanism in this application is used to install and connect the left limit mechanism, the right limit mechanism, and the middle limit mechanism, and to ensure that these three limit mechanisms can move up and down synchronously.

[0102] In some preferred embodiments, the right limiting mechanism further includes a right slider 28 and a right limiting slide rail 27. The two right limiting slide rails 27 are arranged in parallel and are respectively placed on the upper and lower sides of the right horizontal lead screw 23. The two right sliders 28 are respectively mounted on the right sliding bracket 22. The right sliders 28 are slidably connected to the right limiting slide rails 27, and the right sliders 28 and the right limiting slide rails 27 are arranged in a one-to-one correspondence.

[0103] In some preferred embodiments, the left limiting mechanism further includes a left lead screw slider (not shown, see right lead screw slider), a left slider (not shown, see right slider), a left limiting slide rail (not shown, see right limiting slide rail), and a left driver (not shown, see right driver);

[0104] The left lead screw slider is sleeved on the left horizontal lead screw 13 and installed on the left sliding bracket 12;

[0105] The two left limiting slide rails are arranged in parallel and are respectively placed on the upper and lower sides of the left horizontal lead screw 13; the two left sliders are respectively installed on the left sliding bracket 12; the left sliders are slidably connected to the left limiting slide rails; and the left sliders are arranged in a one-to-one correspondence with the left limiting slide rails.

[0106] The left actuator is rotatably connected to the end of the left horizontal lead screw 13, and drives the left horizontal lead screw 13 to rotate through the left actuator.

[0107] In some preferred embodiments, three transmission wheel sets 42 are provided, each transmission wheel set 42 corresponding to a vertical screw 43. One transmission wheel set 42 is placed in the middle for driving the two synchronous rotating shafts 41, and the other two transmission wheel sets 42 are located on both sides for connecting and driving the synchronous rotating shafts 41 with other structures (structures other than those in this application).

[0108] The working principle of the three-way limiting device A in this application includes the following three points:

[0109] 1) The mounting backplate is used to install and secure other structures, providing overall support and connection. The left limiting mechanism is mounted on the mounting backplate via the left mounting base 14, and the right limiting mechanism is mounted on the mounting backplate via the right mounting base 24. Since the left and right limiting slide rails 27 are relatively independent structures, they are mounted separately on the mounting backplate. The mounting backplate is connected to the lifting device, thereby driving the mounting backplate to rise and fall, achieving the overall lifting of the entire three-way limiting device A.

[0110] 2) The intermediate baffle 31 is threadedly connected to the vertical screw 43 via the intermediate connecting block 32. Therefore, the intermediate baffle 31 can be raised and lowered independently relative to the left baffle 11 or the right baffle 21. In other words, all three baffles can be raised and lowered together, and the intermediate baffle 31 can also be raised and lowered individually relative to the other two baffles. The overall raising and lowering of the three baffles is during the adjustment phase, ensuring that the distance between the bottom surface of the three-way limiting device A and the top surface of the platform conveyor B meets the requirements. The raising and lowering of the intermediate baffle 31 can be used to block the transport of printing media or to allow printing media to pass through.

[0111] 3) When only one side of the lead screw is connected to the lead screw driver in the technical solution, the lateral movement adjustment of the baffle on one side is achieved; while when both sides of the lead screw are connected to the lead screw driver in the technical solution, the lateral movement adjustment of both baffles is achieved. Taking the right horizontal lead screw 23 connected to the right driver 25 as an example, its working principle is explained. The right driver 25 drives the right horizontal lead screw 23 to rotate around its own axis. The right lead screw slider 26 rotates relative to the right horizontal lead screw 23. Under the limitation of the right limit slide rail 27, the right sliding bracket 22, being fixed to the right lead screw slider 26, causes the right lead screw slider 26 to move laterally, which in turn causes the right sliding bracket 22 to move laterally, ultimately causing the right baffle 21 to move laterally.

[0112] In some preferred embodiments, the platform-type conveying device B includes a support frame 70, a negative pressure housing 80, an active mechanism 50, and a driven mechanism 60;

[0113] The negative pressure housing 80 is installed above the support frame 70, and the negative pressure housing 80 has an internal cavity with a flat top surface.

[0114] The bottom of the negative pressure housing 80 has a negative pressure communication port M, and its top surface has multiple rectangular adsorption ports (not shown in the figure).

[0115] The active mechanism 50 includes an active driver 51, an active shaft 53, an active pulley 54, and a belt drive assembly 52; both ends of the active shaft 53 are rotatably connected to the negative pressure housing 80, and the active pulley 54 is sleeved on the active shaft 53; the active driver 51 is connected to the active shaft 53 through the belt drive assembly 52, and drives the active shaft 53 to rotate through the active driver 51.

[0116] The active rotating wheel 54 is placed inside the negative pressure housing 80 and located at the adsorption port; the highest point of the stroke of the active rotating wheel 54 is higher than the top surface of the negative pressure housing 80.

[0117] Multiple active mechanisms 50 are arranged in parallel;

[0118] The driven mechanism 60 includes a driven shaft 61, a driven wheel 62, and a driven transmission assembly; the two ends of the driven shaft 61 are rotatably mounted on the negative pressure housing 80 and are arranged parallel to the drive shaft 53; the driven wheel 62 is sleeved on the driven shaft 61 and is placed at the suction port; the highest point of the stroke of the driven wheel 62 is higher than the top surface of the negative pressure housing 80;

[0119] The driven shaft 61 is connected to one of the driving shafts 53 via the driven transmission assembly.

[0120] In some preferred embodiments, the driven transmission component is a belt synchronous transmission component or a ratchet transmission component.

[0121] In some preferred embodiments, the driven transmission assembly includes a driving ratchet 63, a driven ratchet 64, and a transmission chain (not shown);

[0122] The active ratchet 63 is sleeved on one of its active shafts 53, and the driven ratchet 64 is sleeved on the driven shaft 61; the active ratchet 63 is connected to and drives the driven ratchet 64 through the transmission chain.

[0123] In some preferred embodiments, the adsorption port is rectangular, and the rectangular adsorption port forms an adsorption gap with the active rotor 54 or the driven rotor 62.

[0124] In some preferred embodiments, the platform conveyor B further includes a partitioning mechanism that divides the internal cavities of the negative pressure housing 80. Each additional partitioning mechanism creates one more chamber.

[0125] The separation mechanism is provided with a partition 91 and a conductive component 92. The partition 91 is placed vertically inside the negative pressure housing 80, and a through hole is provided on the partition 91. The conductive component 92 is used to open or close the through hole.

[0126] The conducting component 92 can adopt any of the existing technologies.

[0127] The drivers in this application are drive motors, which can be servo motors.

[0128] In this application, the platform-type conveyor device B is used for negative pressure adsorption of printing media, and achieves independent transportation and delivery of the printing media. Because each active mechanism 50 operates independently, independent motion control of each active mechanism 50 is possible, providing a more independent motion control effect compared to belt conveying. Simultaneously, negative pressure adsorption of the printing media during the delivery process through the adsorption gap ensures the stability and smoothness of the delivery. Furthermore, the adsorption of the printing media can even achieve a dust removal effect.

[0129] In addition, since the driven transmission component is a ratchet transmission, when the driving mechanism 50 connected to the driven mechanism 60 is running, the driven mechanism 60 is driven to move together; and when the driving mechanism 50 stops running, the driven mechanism 60 can still continue to rotate under the action of inertia.

[0130] Preferably, the driven mechanism 60 is located at the end of the conveying direction of the platform conveyor B. It is used to continue conveying the printing media for the last part of the journey, thus making the conveying of the printing media by the entire platform conveyor B smoother and more accurate.

[0131] The three-way limiting device A and the platform-type conveying device B of this application ensure the independence of the entire printing media limiting and conveying process in at least three ways: first, independent limiting and conveying is achieved through the asymmetry of the left baffle 11 and the right baffle 21; second, the independence of the limited conveying is achieved through the spacing control between the three-way limiting device A and the platform-type conveying device B; and third, the precise control of the independent conveying of each printing media is achieved through the independent movement of each active mechanism 50.

[0132] Furthermore, the entire platform-type conveyor device B can continuously hold multiple printing media, and the conveying of each printing media can be independently controlled. Compared with existing technologies, the movement is more independent, the control is easier, and the energy consumption is greater.

[0133] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A print front edge transport system for a sheet media, characterized by: It comprises a three-way limiting device and a platform conveying device; the three-way limiting device is installed above the platform conveying device; The three-way limiting device comprises a left limiting mechanism, a right limiting mechanism, a middle limiting mechanism and a transverse connecting mechanism; the left limiting mechanism and the right limiting mechanism are respectively arranged on the two sides of the middle limiting mechanism, and the left limiting mechanism, the right limiting mechanism and the middle limiting mechanism are respectively connected with the transverse connecting mechanism and synchronously lifted; The left limiting mechanism comprises a left baffle, a left sliding support, a left horizontal screw rod and a left mounting seat; The left baffle is installed on the left sliding support, and the left sliding support is sleeved on the left horizontal screw rod; the left horizontal screw rod is installed on the transverse connecting mechanism through the left mounting seat; The right limiting mechanism comprises a right baffle, a right sliding support, a right horizontal screw rod, a right screw rod sliding block, a right mounting seat and a right driver; The right baffle is installed on the right sliding support, the right sliding support is fixedly connected with the right screw rod sliding block, the right screw rod sliding block is sleeved on the right horizontal screw rod, the end of the right horizontal screw rod is connected with the right driver, the right horizontal screw rod is driven to rotate through the right driver, and the right horizontal screw rod is installed on the transverse connecting mechanism through the right mounting seat; The middle limiting mechanism is connected with the transverse connecting mechanism; The left baffle and the right baffle are placed opposite to each other and respectively arranged on the two sides of the middle limiting mechanism; The platform conveying device is used for adsorbing and conveying a printing medium; The middle limiting mechanism comprises a middle baffle, and the acting surface of the middle baffle is a plane; The acting surface of the left baffle comprises a left inclined surface and a left straight surface; a left horizontal line is formed at the junction of the left inclined surface and the left straight surface; The acting surface of the right baffle comprises a right inclined surface, a right upper straight surface and a right lower straight surface; the right inclined surface is located between the right upper straight surface and the right lower straight surface; a right upper horizontal line is formed at the junction of the right inclined surface and the right upper straight surface, and a right lower horizontal line is formed at the junction of the right inclined surface and the right lower straight surface; In the height position, the left horizontal line is located between the right upper horizontal line and the right lower horizontal line; The left straight surface is parallel to the right upper straight surface, and is respectively perpendicular to the acting surface of the middle baffle.

2. The print front edge transport system of media in a sheet form according to claim 1, characterized by: The middle limiting mechanism further comprises a middle connecting block; the middle baffle is vertically placed, and the middle connecting block is installed on the back side of the middle baffle; The middle connecting block is rotationally connected with the transverse connecting mechanism; The left baffle and the right baffle are respectively arranged on the two sides of the middle baffle; The bottom surfaces of the left baffle, the right baffle and the middle baffle are flush.

3. A print front edge transport system for sheet media according to claim 2, wherein: The transverse connecting mechanism comprises a mounting back plate, synchronous rotating shafts, transmission wheel sets, vertical screw rods and connecting mounting seats; The mounting back plate is vertically placed; One of the transmission wheel sets is arranged in the middle, and the other two synchronous rotating shafts are respectively arranged on the two sides of the transmission wheel set; The synchronous rotating shafts are transversely placed, and one end of each of the synchronous rotating shafts is connected with the transmission wheel set; the two synchronous rotating shafts are connected through the transmission wheel set and synchronously rotated; The synchronous rotating shafts are installed on the mounting back plate through the connecting mounting seats. The vertical screw is vertically placed and connected with the transmission wheel set to realize transmission through the transmission wheel set and the synchronous rotating shaft; the end of the vertical screw is threadedly connected with the middle connecting block; The left mounting seat and the right mounting seat are respectively mounted on the mounting back plate; The driver drives the transmission wheel set to rotate, so that the synchronous rotating shaft and the vertical screw rotate synchronously.

4. A print front edge transport system for a sheet media according to claim 3, wherein: The right limiting mechanism further comprises right sliding blocks and right limiting sliding rails, two of which are arranged in parallel and are respectively arranged on the upper and lower sides of the right horizontal screw rod; the two right sliding blocks are respectively mounted on the right sliding bracket; the right sliding block is in sliding connection with the right limiting sliding rail, and the right sliding block and the right limiting sliding rail are arranged in one-to-one correspondence.

5. The print front edge transport system of claim 3, wherein: The left limiting mechanism further comprises a left screw rod sliding block, a left sliding block, a left limiting sliding rail and a left driver; The left screw rod sliding block is sleeved on the left horizontal screw rod and is mounted on the left sliding bracket; Two left limiting sliding rails are arranged in parallel and are respectively arranged on the upper and lower sides of the left horizontal screw rod; two left sliding blocks are respectively mounted on the left sliding bracket; the left sliding block is in sliding connection with the left limiting sliding rail; and the left sliding block and the left limiting sliding rail are arranged in one-to-one correspondence; The left driver is in rotary connection with the end of the left horizontal screw rod, and the left horizontal screw rod is driven to rotate by the left driver.

6. A print front edge transport system for sheet media according to any of claims 1-5, characterized in that: The platform type conveying device comprises a support frame, a negative pressure shell, a driving mechanism and a driven mechanism. The negative pressure shell is mounted above the support frame, and the negative pressure shell forms an internal cavity with a flat top surface. The bottom of the negative pressure shell is formed with a negative pressure communication port, and the top surface is provided with a plurality of rectangular suction ports. The driving mechanism comprises a driving driver, a driving shaft, a driving pulley and a belt transmission assembly; the two ends of the driving shaft are in rotary connection with the negative pressure shell, and the driving pulley is sleeved on the driving shaft; the driving driver is connected with the driving shaft through the belt transmission assembly, and the driving shaft is driven to rotate by the driving driver; The driving pulley is arranged in the negative pressure shell and located at the suction port; the highest point of the stroke of the driving pulley is higher than the top surface of the negative pressure shell; A plurality of driving mechanisms are arranged in parallel. The driven mechanism comprises a driven shaft, a driven pulley and a driven transmission assembly; the two ends of the driven shaft are respectively rotatably mounted on the negative pressure shell and arranged in parallel with the driving shaft; the driven pulley is sleeved on the driven shaft and arranged at the suction port; the highest point of the stroke of the driven pulley is higher than the top surface of the negative pressure shell; The driven shaft is connected with one of the driving shafts through the driven transmission assembly.

7. A print front edge transport system for sheet media according to claim 6, characterized in that: The driven transmission assembly is a belt synchronous transmission assembly or a ratchet transmission assembly.

8. The print front edge media transport system of claim 6, wherein: The driven transmission assembly comprises a driving ratchet, a driven ratchet and a transmission chain; The driving ratchet is sleeved on one of the driving shafts, and the driven ratchet is sleeved on the driven shaft; the driving ratchet is connected with the driven ratchet through the transmission chain and drives the driven ratchet.

9. The print front edge media transport system of claim 6, wherein: The suction port is rectangular, and the rectangular suction port forms a suction gap with the driving pulley or the driven pulley.

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