A device for unwinding a roll of fabric for a digital printing machine

Abstract

The application discloses a pay-off device for a digital printing machine and belongs to the technical field of pay-off devices. The pay-off device is characterized in that the top of the cloth roller is attached to the bottom of the conveying belt after the cloth roller is fixed by the fixing mechanism, the spring ensures that the conveying belt is in a taut state when the conveying belt is attached to the cloth roller, the end face gear on one side of the double-head motor is engaged with the bevel gear through the extension of the hydraulic device, the double-head motor is started, the double-head motor drives the rotating shaft to rotate, the rotating shaft drives the transmission shaft to rotate through the engagement of the first bevel gear and the second bevel gear, the transmission shaft drives the driving roller and the conveying belt to rotate at a constant speed through the driving disc, the first belt and the transmission disc, and the conveying belt drives the cloth roller to rotate at a constant speed to pay off the cloth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unwinding, in particular to an unwinding device for a digital printing machine. BACKGROUND

[0002] The printing machine is mainly divided into: heat transfer printing machine, digital printing machine (universal printer) flat screen printing machine and rotary screen printing machine, walking printing machine and the like, which is a kind of "non-contact" inkjet printing type high-tech digital printing equipment. The printer can print glass, PVC, wood and any other materials after modification.

[0003] When the printing machine prints the cloth, the cloth has certain ductility, which is not convenient for traction feeding, and the cloth needs to be unwound. The existing unwinding equipment drives the cloth roller to rotate by the motor. When the thickness of the cloth on the roller becomes smaller, the unwinding speed changes. The existing equipment is not convenient for uniform speed unwinding. In addition, the roller needs to be installed before unwinding. Due to the difference in the inner wall diameter of part of the cloth roller, the installation is more inconvenient. In addition, the mass of the cloth roller is large, which is time-consuming and laborious during installation.

[0004] To solve the above problems, the present application provides an unwinding device for a digital printing machine. SUMMARY

[0005] The present application aims to provide an unwinding device for a digital printing machine, which solves the problem that the existing unwinding equipment is driven by a motor to rotate the cloth roller, and when the thickness of the cloth on the roller becomes smaller, the unwinding speed changes, and the existing equipment is not convenient for uniform speed unwinding. In addition, the roller needs to be installed before unwinding. Due to the difference in the inner wall diameter of part of the cloth roller, the installation is more inconvenient. In addition, the mass of the cloth roller is large, which is time-consuming and laborious during installation.

[0006] To achieve the above purpose, the present application provides the following technical scheme: an unwinding device for a digital printing machine, comprising an unwinding mechanism, a fixing mechanism and a feeding mechanism arranged on the unwinding mechanism, the unwinding mechanism comprising a support assembly, a driving assembly, a transmission assembly and an unwinding assembly, the support assembly comprising a bottom plate, the bottom plate being installed on one side of the printing machine, the top of the bottom plate being fixedly connected with a support plate, the top of the support plate being fixedly connected with a support frame and a support piece on both sides above, the top of the support piece being fixedly connected with a shell, the unwinding mechanism further comprising a cloth roller movably arranged on the top of the bottom plate below the support frame;

[0007] The driving assembly comprises a first fixed plate fixedly connected to one side of the support plate, the first fixed plate is provided with a movable slot penetrating from top to bottom, a double-head motor is slidably connected above the first fixed plate, the bottom of the double-head motor is fixedly connected with a movable block, the driving assembly further comprises a hydraulic device fixedly connected to one side of the support plate, and the output end of the hydraulic device is fixedly connected with the movable block, the two side output ends of the double-head motor are fixedly connected with face gears, one side of the support member is rotatably connected with a rotating shaft, the bottom of the rotating shaft is fixedly connected with a bevel gear corresponding to the face gear, and the top of the rotating shaft extends into the inside of the shell and is fixedly connected with a first bevel gear;

[0008] The transmission assembly comprises a fixed seat fixedly connected to the top of the support member, the fixed seat is rotatably connected with a transmission shaft, one end of the transmission shaft extends into the shell and is fixedly connected with a second bevel gear, the second bevel gear is meshingly connected with the first bevel gear, the other end of the transmission shaft is fixedly connected with a driving disc, and the transmission assembly further comprises transmission discs rotatably connected in front of and behind one side of the support frame, and a first belt is sleeved between the two groups of transmission discs and the driving disc.

[0009] The unwinding assembly comprises a lower pressing member, the lower pressing member is provided with two groups, the lower pressing member comprises a second fixed plate fixedly connected to the middle of the inner wall of the support frame, the two groups of second fixed plates are rotatably connected with second transmission rollers between them, the middle of the second fixed plate is provided with a sliding groove, the sliding groove is slidably connected with movable plates, the two groups of movable plates are rotatably connected with second transmission rollers between them, the movable plates and the top of the second fixed plate are fixedly connected with springs, the unwinding assembly further comprises third transmission rollers and driving rollers rotatably connected to the front and back of the inner side of the support frame, one end of the driving roller penetrates through the support frame and is fixedly connected with the transmission disc, and a conveying belt is installed between the first transmission roller, the second transmission roller, the third transmission roller and the driving roller.

[0010] Further, the fixing mechanism comprises a rotating assembly, a first linkage assembly and a fixing assembly, the rotating assembly comprises a bearing rotatably connected to one side of the support plate, and the inner side of the bearing is fixedly connected with a rotating disc.

[0011] Further, one side of the rotating disc is provided with an annular groove, the inside of the annular groove is uniformly distributed with mounting pieces, and the mounting pieces are fixedly connected to the inside of the annular groove, and the outer side of the mounting pieces is fixedly connected with fixing rods.

[0012] Further, the first linkage assembly comprises a first lead screw rotatably connected to the support plate, one end of the first lead screw is fixedly connected with a transmission piece, and the other side of the transmission piece is provided with a meshing groove corresponding to the face gear.

[0013] Further, a sliding disc is threadedly connected to the first lead screw, the sliding disc is fixedly connected with guide rods in front and back of one side, and the support plate is provided with through holes corresponding to the guide rods.

[0014] Further, the fixing assembly comprises a fixing roller fixedly connected to one side of the sliding disc, and the fixing assembly further comprises a second rotating rod rotatably connected to one end and the middle of the fixing rod, the bottom of the second rotating rod is rotatably connected with a first rotating rod, the other end of the first rotating rod is rotatably connected with a fixing block, and the fixing block is fixedly connected to the outer wall of the fixing roller.

[0015] Further, the fixing assembly further comprises a fixing piece rotatably connected to the other end of the second rotating rod, and the top of the two adjacent groups of fixing pieces is fixedly connected with a fixing column.

[0016] Further, the feeding mechanism comprises a second linkage assembly, a limiting groove and a feeding assembly, the second linkage assembly comprises a driving wheel fixedly connected to the first lead screw, and further comprises a transmission wheel rotatably connected to the inside below of the supporting plate.

[0017] Further, the second belt is sleeved between the transmission wheel and the driving wheel, and the second linkage assembly further comprises a second lead screw fixedly connected to one side of the transmission wheel, and the second lead screw is rotatably connected with the supporting plate.

[0018] Further, the limiting groove is arranged on the top of the bottom plate, the feeding assembly comprises a mounting plate, and two groups of mounting plates are arranged, and the mounting plates are screw-connected with the second lead screw, the bottom of the mounting plate is fixedly connected with a limiting block on both sides, the limiting block is slidably connected in the inside of the limiting groove, the top of the two groups of mounting plates is fixedly connected with a supporting plate, the top of the supporting plate is provided with an arc groove, and one side of the bottom plate is fixedly connected with a fixing table.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The feeding device for the digital printing machine provided by the present application, when the fixing mechanism fixes the cloth roller, the top of the cloth roller is attached to the bottom of the conveying belt, the spring ensures that the conveying belt is in a tight state when the conveying belt is attached to the cloth roller, the end face gear on one side of the double-head motor is engaged with the bevel gear through the extension of the hydraulic device, the double-head motor is started, the rotating shaft is driven to rotate by the double-head motor, the transmission shaft is driven to rotate through the engagement of the first bevel gear and the second bevel gear, the driving roller and the conveying belt are driven to rotate at a constant speed through the driving disc, the first belt and the transmission disc, and the cloth roller is driven to rotate at a constant speed to feed when the conveying belt rotates at a constant speed.

[0021] 2. The unwinding device for a digital printing machine provided by the present application, when the hydraulic device retracts, the double-head motor is driven to move closer to one side of the support plate, so that the hydraulic device is engaged with the transmission member, when the double-head motor rotates, the transmission member is driven to rotate the first lead screw, so that the sliding disc on the first lead screw moves, when the sliding disc drives the fixed roller to move away from the support plate, the second rotating rod is driven to rotate around the fixed rod through the fixed block and the first rotating rod, and the radial distance between the plurality of fixed members is increased, so that the cloth roller is finally fixed, convenient to install, and can adapt to the installation of cloth rollers of various sizes.

[0022] 3. The unwinding device for a digital printing machine provided by the present application, by rolling the cloth roller on the fixed table, when the cloth roller rolls to the arc groove in the support plate, the first lead screw drives the driving wheel and rotates the transmission wheel through the second belt when the double-head motor drives the first lead screw to rotate and drive the plurality of fixed columns to retract, the second lead screw is driven by the transmission wheel, so that the mounting plate, the support plate and the cloth roller on the support plate move closer to one side of the support plate, and the cloth roller is placed on the outer edge of the fixed column when the fixed column retracts, when the double-head motor reversely rotates, the fixed column expands outward and fixes the cloth roller, at this time the support plate resets, realizes feeding, saves time and effort. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is a schematic diagram of the unwinding mechanism structure of the present application;

[0025] Figure 3 It is a schematic diagram of the support assembly structure of the present application;

[0026] Figure 4 It is a split diagram of the driving assembly structure of the present application;

[0027] Figure 5 It is a schematic diagram of the transmission assembly structure of the present application;

[0028] Figure 6 It is a schematic diagram of the unwinding assembly structure of the present application;

[0029] Figure 7 It is a split diagram of the unwinding assembly structure of the present application;

[0030] Figure 8 It is a schematic diagram of the fixing mechanism structure of the present application;

[0031] Figure 9 It is a split diagram of the fixing mechanism structure of the present application;

[0032] Figure 10 It is a schematic diagram of the rotating assembly and the first linkage assembly structure of the present application;

[0033] Figure 11 It is a fixed assembly structure exploded view of the application;

[0034] Figure 12 It is a feeding mechanism structure schematic view of the application;

[0035] Figure 13 It is a second linkage assembly structure schematic view of the application;

[0036] Figure 14 It is a feeding assembly structure exploded view of the application.

[0037] In the figure: 1, unwinding mechanism; 11, support assembly; 111, bottom plate; 112, support plate; 1121, through hole; 113, support frame; 114, support piece; 115, shell; 12, driving assembly; 121, first fixed plate; 122, movable groove; 123, double-head motor; 124, movable block; 125, hydraulic device; 126, face gear; 127, rotating shaft; 128, bevel gear; 129, first bevel gear; 13, transmission assembly; 131, fixed seat; 132, transmission shaft; 133, second bevel gear; 134, driving disc; 135, first belt; 136, transmission disc; 14, unwinding assembly; 141, first transmission roller; 142, second transmission roller; 143, third transmission roller; 144, driving roller; 145, conveyor belt; 146, pressing member; 1461, second fixed plate; 1462, chute; 1463, spring; 1464, movable plate; 15, cloth roller; 2, fixing mechanism; 21, rotating assembly; 211, bearing; 212, rotating disc; 213, annular groove; 214, mounting sheet; 215, fixed rod; 22, first linkage assembly; 221, transmission piece; 222, first lead screw; 223, driving wheel; 224, sliding disc; 225, guide rod; 23, fixed assembly; 231, fixed roller; 232, fixed block; 233, first rotating rod; 234, second rotating rod; 235, fixing piece; 236, fixed column; 3, feeding mechanism; 31, second linkage assembly; 311, transmission wheel; 312, second belt; 313, second lead screw; 32, limiting groove; 33, feeding assembly; 331, fixed table; 332, mounting plate; 333, limiting block; 334, supporting plate. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0039] In order to solve the existing unwinding device is driven by motor to rotate the cloth roll, when the thickness of the cloth on the roll is smaller, the unwinding speed changes, the existing device is not convenient for uniform speed unwinding, such as Figures 1-7 As shown in the figure, the following preferred technical solutions are provided:

[0040] The unwinding device for the digital printing machine comprises an unwinding mechanism 1, a fixing mechanism 2 and a feeding mechanism 3 arranged on the unwinding mechanism 1, the unwinding mechanism 1 comprises a supporting assembly 11, a driving assembly 12, a transmission assembly 13 and an unwinding assembly 14, the supporting assembly 11 comprises a bottom plate 111, the bottom plate 111 is installed on one side of the printing machine, the top of the bottom plate 111 is fixedly connected with a supporting plate 112, the top of the supporting plate 112 is fixedly connected with a supporting frame 113 and a supporting piece 114 on both sides, the top of the supporting piece 114 is fixedly connected with a shell 115, the unwinding mechanism 1 further comprises a cloth roll 15 movably arranged on the top of the bottom plate 111 below the supporting frame 113;

[0041] The driving assembly 12 comprises a first fixed plate 121 fixedly connected on one side of the supporting plate 112, the first fixed plate 121 is provided with a movable slot 122 penetrating up and down, the first fixed plate 121 is slidably connected with a double-head motor 123 above, the bottom of the double-head motor 123 is fixedly connected with a movable block 124, the driving assembly 12 further comprises a hydraulic device 125 fixedly connected on one side of the supporting plate 112, and the output end of the hydraulic device 125 is fixedly connected with the movable block 124, the output ends of the double-head motor 123 on both sides are fixedly connected with face gears 126, one side of the supporting piece 114 is rotatably connected with a rotating shaft 127, the bottom of the rotating shaft 127 is fixedly connected with a bevel gear 128 corresponding to the face gear 126, the top of the rotating shaft 127 extends to the inside of the shell 115 and is fixedly connected with a first bevel gear 129, the face gear 126 on one side of the double-head motor 123 is meshed with the bevel gear 128 by the extension of the hydraulic device 125, and the rotating shaft 127 can be driven to rotate when the double-head motor 123 starts;

[0042] The transmission assembly 13 comprises a fixed seat 131 fixedly connected on the top of the supporting piece 114, the fixed seat 131 is rotatably connected with a transmission shaft 132, one end of the transmission shaft 132 extends to the inside of the shell 115 and is fixedly connected with a second bevel gear 133, and the second bevel gear 133 is meshed and connected with the first bevel gear 129, the other end of the transmission shaft 132 is fixedly connected with a driving disc 134, the transmission assembly 13 further comprises transmission discs 136 rotatably connected on the front and back of one side of the supporting frame 113, and a first belt 135 is sleeved between the two groups of transmission discs 136 and the driving disc 134, the driving disc 134 is driven to rotate by the first bevel gear 129, the second bevel gear 133 and the transmission shaft 132 when the rotating shaft 127 rotates, and in turn drives the transmission discs 136 to rotate through the first belt 135.

[0043] The unwinding assembly 14 comprises a pressing member 146, which is provided with two groups of second fixed plates 1461 fixedly connected to the middle of the inner wall of the support frame 113, and a second transmission roller 142 rotationally connected between the two groups of second fixed plates 1461. The middle of the second fixed plate 1461 is provided with a sliding groove 1462, and a movable plate 1464 is slidingly connected in the sliding groove 1462. The second transmission roller 142 is rotationally connected between the two groups of movable plates 1464. The spring 1463 is fixedly connected between the movable plate 1464 and the top of the second fixed plate 1461. The unwinding assembly 14 further comprises a third transmission roller 143 and a driving roller 144 rotationally connected to the front and rear inner sides of the support frame 113. One end of the driving roller 144 penetrates through the support frame 113 and is fixedly connected with the transmission disc 136. The first transmission roller 141, the second transmission roller 142, the third transmission roller 143, and the driving roller 144 are provided with a conveying belt 145. The horizontal height of the third transmission roller 143 is lower than that of the second transmission roller 142. When the transmission disc 136 rotates, the driving roller 144 drives the conveying belt 145 to rotate at a constant speed. When the cloth roller 15 is attached to the bottom of the conveying belt 145, the conveying belt 145 drives the cloth roller 15 to unwind at a constant speed.

[0044] Specifically, when the fixing mechanism 2 fixes the cloth roller 15, the top of the cloth roller 15 is attached to the bottom of the conveying belt 145. The spring 1463 ensures that the conveying belt 145 is in a tight state when it is attached to the cloth roller 15. The hydraulic device 125 extends to make the end face gear 126 on one side of the double-head motor 123 mesh with the bevel gear 128. The double-head motor 123 is started, which drives the rotating shaft 127 to rotate. The rotating shaft 127 drives the transmission shaft 132 to rotate through the meshing of the first bevel gear 129 and the second bevel gear 133. The transmission shaft 132 drives the driving roller 144 and the conveying belt 145 to rotate at a constant speed through the driving disc 134, the first belt 135, and the transmission disc 136. When the conveying belt 145 rotates at a constant speed, it drives the cloth roller 15 to rotate at a constant speed for unwinding.

[0045] In order to solve the technical problem that the winding roller needs to be installed before unwinding, and due to the difference in the inner wall diameter of part of the cloth roller, the installation is more inconvenient, as shown in Figures 8-11 The following preferred technical solutions are provided:

[0046] The fixing mechanism 2 comprises a rotating assembly 21, a first linkage assembly 22 and a fixing assembly 23. The rotating assembly 21 comprises a bearing 211 rotatably connected to one side of the support plate 112, the inner side of the bearing 211 is fixedly connected with a rotating disc 212, one side of the rotating disc 212 is provided with an annular groove 213, the inner side of the annular groove 213 is uniformly distributed with mounting pieces 214, the mounting pieces 214 are fixedly connected to the inner side of the annular groove 213, the outer side of the mounting pieces 214 is fixedly connected with a fixing rod 215, and the fixing rod 215 is rotatable at one side of the support frame 113 through the mounting pieces 214, the rotating disc 212 and the bearing 211.

[0047] The first linkage assembly 22 comprises a first lead screw 222 rotatably connected to the support plate 112, one end of the first lead screw 222 is fixedly connected with a transmission piece 221, the other side of the transmission piece 221 is provided with a meshing groove corresponding to the face gear 126, the first lead screw 222 is threadedly connected with a sliding disc 224, the sliding disc 224 is fixedly connected with guide rods 225 in front and back on one side, and the support plate 112 is provided with through holes 1121 corresponding to the guide rods 225, when the hydraulic device 125 is retracted, the face gear 126 on the other side of the double-head motor 123 is meshed with the transmission piece 221 and drives the first lead screw 222 to rotate, and the first lead screw 222 drives the sliding disc 224 to move when rotating.

[0048] The fixing assembly 23 comprises a fixing roller 231 fixedly connected to one side of the sliding disc 224, the fixing assembly 23 further comprises a second rotating rod 234 rotatably connected to one end and the middle of the fixing rod 215, the bottom of the second rotating rod 234 is rotatably connected with a first rotating rod 233, the other end of the first rotating rod 233 is rotatably connected with a fixing block 232, the fixing block 232 is fixedly connected to the outer wall of the fixing roller 231, the fixing assembly 23 further comprises a fixing piece 235 rotatably connected to the other end of the second rotating rod 234, the top of the adjacent two groups of fixing pieces 235 is fixedly connected with a fixing column 236, when the sliding disc 224 drives the fixing roller 231 to move away from the support plate 112, the second rotating rod 234 is driven to rotate around the fixing rod 215 through the fixing block 232 and the first rotating rod 233, and the radial distance between the groups of fixing pieces 235 is increased, and finally the cloth roller 15 is fixed in the middle of the cloth roller 15.

[0049] Specifically, when the hydraulic device 125 is retracted, the double-head motor 123 is driven to move close to one side of the support plate 112, so that the hydraulic device 125 is engaged with the transmission member 221. When the double-head motor 123 rotates, the first screw rod 222 is driven to rotate through the transmission member 221, so that the sliding disc 224 on the first screw rod 222 moves. When the sliding disc 224 drives the fixed roller 231 to move away from the support plate 112, the second rotating rod 234 is driven to rotate around the fixed rod 215 through the fixed block 232 and the first rotating rod 233, and the radial distance between the multiple sets of fixing members 235 is increased, so that the cloth roller 15 is finally fixed. The installation is convenient, and multiple sizes of cloth rollers 15 can be installed.

[0050] In order to solve the technical problems that the cloth roller is heavy and time-consuming and laborious during installation, such as Figures 12-14 As shown in the drawings, the following preferred technical solutions are provided:

[0051] The feeding mechanism 3 comprises a second linkage assembly 31, a limiting groove 32 and a feeding assembly 33. The second linkage assembly 31 comprises a driving wheel 223 fixedly connected to the first screw rod 222, and further comprises a transmission wheel 311 rotatably connected to the inside of the support plate 112.

[0052] The second belt 312 is sleeved between the transmission wheel 311 and the driving wheel 223. The second linkage assembly 31 further comprises a second screw rod 313 fixedly connected to one side of the transmission wheel 311, and the second screw rod 313 is rotatably connected to the support plate 112.

[0053] The limiting groove 32 is arranged on the top of the bottom plate 111. The feeding assembly 33 comprises two sets of mounting plates 332, and the mounting plates 332 are threadedly connected to the second screw rod 313. The bottom sides of the mounting plates 332 are fixedly connected to limiting blocks 333, and the limiting blocks 333 are slidably connected to the inside of the limiting groove 32. The top of each mounting plate 332 is fixedly connected to a supporting plate 334, and the supporting plate 334 is provided with an arc groove on the top. A fixed table 331 is fixedly connected to one side of the bottom plate 111.

[0054] Specifically, the cloth roller 15 is rolled on the fixed table 331. When the cloth roller 15 rolls to the supporting plate 334 and falls into the arc groove, the first screw rod 222 drives the driving wheel 223 to rotate and drives the transmission wheel 311 to rotate through the second belt 312. The transmission wheel 311 drives the second screw rod 313 to move the mounting plate 332, the supporting plate 334 and the cloth roller 15 on the supporting plate 334 close to one side of the support plate 112. When the fixed column 236 is retracted, the cloth roller 15 is placed on the outer edge of the fixed column 236. When the double-head motor 123 reversely rotates, the fixed column 236 expands outward and fixes the cloth roller 15. At this time, the supporting plate 334 is reset.

[0055] It is to be noted that the terms such as first and second, etc. are used herein merely to differentiate one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Also, the terms "including", "containing" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0056] The above description is merely preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, within the technical scope disclosed by the present application, can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application, which should be covered within the protection scope of the present application.

Claims

1. A pay-off device for a digital printing machine, comprising a pay-off mechanism (1) and a fixing mechanism (2) and a feeding mechanism (3) arranged on the pay-off mechanism (1), characterized in that: The unwinding mechanism (1) comprises a supporting assembly (11), a driving assembly (12), a transmission assembly (13) and an unwinding assembly (14), the supporting assembly (11) comprises a bottom plate (111), the bottom plate (111) is installed on one side of the printing machine, the top of the bottom plate (111) is fixedly connected with a supporting plate (112), the top of the supporting plate (112) is fixedly connected with a supporting frame (113) and a supporting piece (114) on the two sides, the top of the supporting piece (114) is fixedly connected with a shell (115), the unwinding mechanism (1) further comprises a cloth roller (15) movably arranged on the top of the bottom plate (111) below the supporting frame (113); The driving assembly (12) comprises a first fixed plate (121) fixedly connected on one side of the supporting plate (112), the first fixed plate (121) is provided with a movable slot (122) penetrating from top to bottom, the first fixed plate (121) is slidably connected with a double-head motor (123) above, the bottom of the double-head motor (123) is fixedly connected with a movable block (124), the driving assembly (12) further comprises a hydraulic device (125) fixedly connected on one side of the supporting plate (112), and the output end of the hydraulic device (125) is fixedly connected with the movable block (124), the two output ends of the double-head motor (123) are fixedly connected with face gears (126), one side of the supporting piece (114) is rotatably connected with a rotating shaft (127), the bottom of the rotating shaft (127) is fixedly connected with a bevel gear (128) corresponding to the face gear (126), the top of the rotating shaft (127) extends into the shell (115) and is fixedly connected with a first bevel gear (129); The transmission assembly (13) comprises a fixed seat (131) fixedly connected on the top of the supporting piece (114), the fixed seat (131) is rotatably connected with a transmission shaft (132), one end of the transmission shaft (132) extends into the shell (115) and is fixedly connected with a second bevel gear (133), and the second bevel gear (133) is meshedly connected with the first bevel gear (129), the other end of the transmission shaft (132) is fixedly connected with a driving disc (134), the transmission assembly (13) further comprises transmission discs (136) rotatably connected on the front and back of one side of the supporting frame (113) outside, and the two groups of transmission discs (136) and the driving disc (134) are sleeved with a first belt (135); The unwinding assembly (14) comprises a pressing member (146), the pressing member (146) is provided with two groups, the pressing member (146) comprises a second fixed plate (1461) fixedly connected to the middle of the inner wall of the support frame (113), two groups of the second fixed plate (1461) are rotatably connected with the second transmission roller (142), the middle of the second fixed plate (1461) is provided with a sliding groove (1462), the sliding groove (1462) is slidably connected with a movable plate (1464), two groups of the movable plate (1464) are rotatably connected with the second transmission roller (142), the movable plate (1464) and the top of the second fixed plate (1461) are fixedly connected with a spring (1463), the unwinding assembly (14) further comprises third transmission rollers (143) and driving rollers (144) rotatably connected to the inner side of the support frame (113), one end of the driving roller (144) penetrates through the support frame (113) and is fixedly connected with the transmission disc (136), the first transmission roller (141), the second transmission roller (142), the third transmission roller (143) and the driving roller (144) are provided with a conveying belt (145); The fixing mechanism (2) comprises a rotating assembly (21), a first linkage assembly (22) and a fixing assembly (23), the rotating assembly (21) comprises a bearing (211) rotatably connected to one side of the supporting plate (112), the inner side of the bearing (211) is fixedly connected with a rotating disc (212); The first linkage assembly (22) comprises a first screw rod (222) rotatably connected to the supporting plate (112), one end of the first screw rod (222) is fixedly connected with a transmission piece (221), and the other side of the transmission piece (221) is provided with a meshing groove corresponding to the face gear (126); The fixing assembly (23) comprises a fixed roller (231) fixedly connected to one side of a sliding disc (224), and further comprises a second rotating rod (234) rotatably connected to one end and the middle of a fixed rod (215), the bottom of the second rotating rod (234) is rotatably connected with a first rotating rod (233), the other end of the first rotating rod (233) is rotatably connected with a fixed block (232), and the fixed block (232) is fixedly connected to the outer wall of the fixed roller (231).

2. The unwinding device for a digital printing machine according to claim 1, characterized in that: One side of the rotating disc (212) is provided with an annular groove (213), the inside of the annular groove (213) is uniformly distributed with mounting pieces (214), and the mounting pieces (214) are fixedly connected to the inside of the annular groove (213), the outer side of the mounting pieces (214) is fixedly connected with the fixed rod (215).

3. The unwinding device for a digital printing machine according to claim 2, characterized in that: The sliding disc (224) is threadedly connected to the first screw rod (222), one side of the sliding disc (224) is fixedly connected with guide rods (225) in front and back, and the supporting plate (112) is provided with through holes (1121) corresponding to the guide rods (225).

4. The unwinding device for a digital printing machine according to claim 3, characterized in that: The fixing assembly (23) further comprises a fixing piece (235) rotatably connected to the other end of the second rotating rod (234), and the top of the fixing piece (235) is fixedly connected with a fixed column (236).

5. The unwinding device for a digital printing machine according to claim 3, characterized in that: The feeding mechanism (3) comprises a second linkage assembly (31), a limiting groove (32) and a feeding assembly (33), the second linkage assembly (31) comprises a driving wheel (223) fixedly connected to the first lead screw (222), and further comprises a transmission wheel (311) rotatably connected below the inside of the supporting plate (112).

6. The unwinding device for a digital printing machine according to claim 4, characterized in that: The transmission wheel (311) is sleeved with the second belt (312) between the driving wheel (223), the second linkage assembly (31) further comprises a second lead screw (313) fixedly connected to one side of the transmission wheel (311), and the second lead screw (313) is rotatably connected with the supporting plate (112).

7. The unwinding device for a digital printing machine according to claim 6, characterized in that: The limiting groove (32) is arranged on the top of the bottom plate (111), the feeding assembly (33) comprises a mounting plate (332), and the mounting plate (332) is provided with two groups, and the mounting plate (332) is threadedly connected with the second lead screw (313), the bottom of the mounting plate (332) is fixedly connected with a limiting block (333) on both sides, and the limiting block (333) is slidably connected in the inside of the limiting groove (32), the top of the two groups of mounting plates (332) is fixedly connected with a supporting plate (334), the top of the supporting plate (334) is provided with an arc groove, and one side of the bottom plate (111) is fixedly connected with a fixed table (331).

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