Invoice terminal management printing device

Abstract

The invention relates to the technical field of printers, and discloses an invoice terminal management printing device which comprises a machine body, a needle type printing assembly is arranged in the machine body, a center roller, a plurality of paper guiding rollers and two paper pulling rollers are rotationally installed in the machine body, and a first paper pulling ring and a second paper pulling ring are rotationally installed on the surface of the center roller. The needle type printing assembly is arranged in the area between the two paper pulling rollers, needle sleeves are arranged on the surfaces of the paper pulling rollers, a plurality of branch linkage rods are fixedly installed in the machine body, and a plurality of paper outlet windows are formed in the surface of the machine body. According to the invoice terminal management printing device, the paper pulling roller, the paper guiding roller and the split link rod are arranged on the periphery of the center roller, split link before printing is carried out on chain invoices, then combined link printing is carried out, and finally split link output is carried out, invoice paper conveying is more reliable, the automatic split link function is achieved, and the printing efficiency is improved. Therefore, the stub copy can be independently stored, and the use requirement of the self-service printing terminal is met.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to an invoice terminal management printing device. Background Art

[0002] After the invoice is printed, it is usually necessary to manually separate the copies, leaving a stub copy. In order to realize the invoice printing and automatic separation of the self-service printing terminal, in the prior art, the patent document with the announcement number CN103042835B discloses a multi-copy chain invoice separation printing device, which includes: a separation guide unit, which is fixed to the rear end of the dot matrix printer (the multi-copy chain invoice entry end) by a separation guide component, and the separation guide component is composed of: a left guide fixing seat, a right guide fixing seat, a lower support rod, a rear ribbon rod, a torsion spring (two pieces), and an adjustment knob; a flexible transmission unit, which is composed of three ribbons with flexible characteristics; an adjustment unit, which is fixed to the bottom of the front end of the dot matrix printer (the multi-copy chain invoice output end) by an adjustment component, and the adjustment component is composed of: a left adjustment fixing seat, a right adjustment fixing seat, a front ribbon rod, a torsion spring (two pieces), and an adjustment knob. The invention provides a multi-copy chain invoice printing technology that provides a solution for printing multi-copy chain invoices in different directions as needed after printing them once through flexible transmission.

[0003] Since existing copy printing devices print and then separate copies, this causes the copies of paper to stick to each other, making it difficult to separate them using a machine. This is especially true when printing a single invoice, as the area of ​​a single invoice is small, and positioning and transportation are unstable. The position of the printed text often shifts, affecting usage. Based on this, existing printing devices are not reliable enough in terms of conveying invoice paper and automatically separating copies, and cannot meet the requirements of self-service printing terminals, and need further improvement. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of existing printing devices in that the functions of transmitting invoice paper and automatically separating copies are not reliable enough and cannot meet the use requirements of self-service printing terminals, and to propose an invoice terminal management printing device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an invoice terminal management and printing device, comprising a body, a pin-type printing assembly is arranged inside the body, a center roller, a plurality of paper feed rollers and two paper pulling rollers are rotatably installed inside the body, a first paper pulling ring and a second paper pulling ring are rotatably installed on the surface of the center roller, the pin-type printing assembly is arranged in the area formed between the two paper pulling rollers, and a needle sleeve is arranged on the surface of the paper pulling roller.

[0006] Two gear transmission shafts are installed for rotation inside the machine body, and multiple drive motors are fixedly installed inside the machine body. The multiple drive motors respectively drive the central drum, multiple paper feeding rollers and two gear transmission shafts to rotate. The two gear transmission shafts respectively drive the first paper feeding ring and the second paper feeding ring to rotate. The needle sleeve penetrates the surface of the first paper feeding ring and the second paper feeding ring, so that the needle sleeve rotates together with the first paper feeding ring and the second paper feeding ring.

[0007] There are multiple branching rods fixedly installed inside the machine body, and multiple paper output windows are opened on the surface of the machine body. The chain invoice is divided into paging states by the branching rods, and the needle sleeve rotates synchronously with the first paper pulling ring or the second paper pulling ring to clamp the chain invoice and transport the chain invoice. After the pin-type printing component completes printing on the chain invoice, it uses the paper guide roller to separate the chain invoice and discharges the branch pages from each paper output window, realizing the function of automatic branching, so that the stub copy can be stored separately and the other copies can be taken away, meeting the use requirements of the self-service printing terminal.

[0008] Preferably, the needle sleeve includes a sleeve body, a plurality of sheet grooves arranged in a ring-shaped array are provided on the surface of the sleeve body, a movable plate is rotatably installed in each sheet groove, two needles are fixedly installed on the surface of the movable plate, a connecting ball is fixedly installed on the inner side of the movable plate, a magnetic ring is slidably installed inside the sleeve body, a connecting groove is provided on the surface of the magnetic ring, the connecting ball extends into the connecting groove, a driving sleeve is rotatably provided on the end of the paper pulling roller, the driving sleeve is fixedly connected to the inner wall of the body, and an electromagnetic coil is embedded in the driving sleeve, two sections of reset springs are provided inside the sleeve body, and the two sections of reset springs are respectively pressed against the two ends of the magnetic ring, the electromagnetic coil introduces currents in different directions, generates magnetic fields that attract or repel the magnetic ring, drives the magnetic ring to move left and right, thereby driving the movable plate to flip.

[0009] Preferably, there are two first paper pulling rings and two second paper pulling rings, which are respectively arranged in the grooves at both ends of the central roller, and needle sleeves and driving sleeves are arranged at both ends of the paper pulling roller. The outer circumferential surfaces of the first paper pulling ring and the second paper pulling ring are provided with beef tendon layers, and the surface of the beef tendon layer is flush with the outer circumferential surface of the central roller. The two needles can be inserted into the beef tendon layers of the first paper pulling ring and the second paper pulling ring respectively, so as to achieve the effect of printing a single invoice and outputting different sub-pages, thereby solving the problem that when printing a single invoice, the blank paper that needs to be reversed for output is prone to wrinkling and deviation.

[0010] Preferably, the plurality of paper guiding rollers include a first roller, a second roller and a third roller, and the plurality of driving motors include a first servo motor, a second servo motor and two third servo motors.

[0011] The rotating end of the first servo motor is fixedly connected to the end of the first roller, and the ends of the first roller, the second roller and the third roller are fixedly installed with synchronous wheels. The three synchronous wheels are driven by synchronous belts. The rotating end of the second servo motor is fixedly connected to the end of the center roller, and the rotating ends of the two third servo motors are respectively fixedly connected to the ends of the two gear transmission shafts. The outer circumferential surfaces of the first paper pulling ring and the second paper pulling ring are both provided with tooth grooves, and the surfaces of the two gear transmission shafts are both provided with gears. The two gear transmission shafts are respectively driven by the meshing transmission of the gears and the tooth grooves to drive the first paper pulling ring and the second paper pulling ring to rotate independently.

[0012] Preferably, air holes are provided on the surfaces of the second roller and the third roller, and the ends of the second roller and the third roller are connected with negative pressure air pipes through rotating joints, and the negative pressure air pipes are connected with the air holes through air passages inside the second roller and the third roller. The multiple paper output windows include a first window, a second window and a third window, and the second roller and the third roller are respectively arranged at the entrances of the first window and the second window, and a storage box is inserted in the third window. The chain invoice is separated by a paper feed roller, and the separated pages are discharged from each paper output window.

[0013] Preferably, a plurality of arc-shaped inner lining plates are fixedly installed inside the machine body, and the plurality of arc-shaped inner lining plates are arranged in a ring array around the central drum, and a gap for conveying chain invoices is reserved with the outer surface of the central drum.

[0014] The present invention has the following beneficial effects: 1. The invoice terminal management printing device sets paper pulling rollers and paper guide rollers around the central drum, as well as a splitting rod, to split the chain invoice before printing, then print the combined copies, and finally output the copies. The invoice paper is more reliable in transmission, and the function of automatic splitting is realized, so that the stub copy can be stored separately and the other copies can be taken away, meeting the use requirements of the self-service printing terminal.

[0015] 2. The present invention realizes a printing mode of split-joint printing-re-split, which reduces the difficulty of splitting after printing. In particular, when a single invoice is printed, after a blank chain invoice is input and printed, the single invoice is separated by using the speed difference between the first paper pulling ring and the second paper pulling ring. The single invoice can be output in split copies at the second roller and the third roller respectively, thereby achieving the effect of printing a single invoice and outputting different split pages, solving the problem that when printing a single invoice, the output needs to be backed up with blank paper, which is easy to wrinkle and deviate.

[0016] 3. A driven rotating needle sleeve is arranged on the surface of the paper pulling roller, and the needle sleeve presses the chain invoice tightly against the surfaces of the first paper pulling ring and the second paper pulling ring. The needle head can pass through the chain invoice and pierce into the surfaces of the first paper pulling ring and the second paper pulling ring. Since the chain invoice is separated before printing, the invoice pages of each layer are prone to deviation. The needle head on the surface of the needle sleeve has the function of tightening the invoice paper and stapling it to prevent deviation.

[0017] 4. The present invention is designed with two paper pulling rollers, and needle sleeves are arranged at both ends of the two paper pulling rollers. The movable plates thereof swing, so that different needles can be inserted into the surfaces of the first paper pulling ring and the second paper pulling ring respectively. Not only can the speed difference between the first paper pulling ring and the second paper pulling ring be utilized to separate the connected invoices, but also the first paper pulling ring and the second paper pulling ring can rotate forward and backward to adjust the angle of the chain invoice, thereby achieving the effect of correcting the position of the invoice paper, solving the problem of the offset of the text printing position, and improving the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the overall side section structure of the present invention; Figure 3 The three-dimensional structure of the center drum of the present invention is shown in FIG. Figure 1 ; Figure 4 The three-dimensional structure of the center drum of the present invention is shown in FIG. Figure 2 ; Figure 5 The three-dimensional structure of the center drum of the present invention is shown in FIG. Figure 3 ; Figure 6 The three-dimensional structure of the center drum of the present invention is shown in FIG. Figure 4 ; Figure 7 for Figure 6 A schematic diagram of the structure at H in FIG. Figure 8 It is a schematic diagram of the cross-section structure of the center drum of the present invention; Fig. 9 for Figure 8 A magnified schematic diagram of the structure at F in FIG. Fig.10 for Fig. 9 Schematic diagram of the flipping of the movable plate; Fig.11 Schematic diagram of the center roller and chain invoice.

[0019] In the figure: 1 body, 2 pin-type printing assembly, 3 center drum, 4 paper guide roller, 5 paper pulling roller, 6 first paper pulling ring, 7 second paper pulling ring, 8 needle sleeve, 9 gear transmission shaft, 10 connecting rod, 11 chain invoice, 12 sleeve, 13 movable plate, 14 needle head, 15 connecting ball, 16 magnetic ring, 17 driving sleeve, 18 electromagnetic coil, 19 reset spring, 20 first roller, 21 second roller, 22 third roller, 23 first servo motor, 24 second servo motor, 25 third servo motor, 26 negative pressure air pipe, 27 first window, 28 second window, 29 third window, 30 storage box, 31 arc lining plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Reference Figure 1-Figure 11 An invoice terminal management and printing device comprises a body 1, a pin-type printing assembly 2 is arranged inside the body 1, a center roller 3, a plurality of paper feed rollers 4 and two paper pulling rollers 5 are rotatably installed inside the body 1, a first paper pulling ring 6 and a second paper pulling ring 7 are rotatably installed on the surface of the center roller 3, the pin-type printing assembly 2 is arranged in the area formed between the two paper pulling rollers 5, and a needle sleeve 8 is arranged on the surface of the paper pulling roller 5.

[0023] Specifically, Fig. 9 As shown, the needle sleeve 8 includes a sleeve body 12, the surface of the sleeve body 12 is provided with a plurality of sheet grooves arranged in a ring array, a movable plate 13 is rotatably installed in each sheet groove, two needle heads 14 are fixedly installed on the surface of the movable plate 13, a connecting ball 15 is fixedly installed on the inner side of the movable plate 13, a magnetic ring 16 is slidably installed inside the sleeve body 12, a connecting groove is provided on the surface of the magnetic ring 16, and the connecting ball 15 extends into the connecting groove.

[0024] The end of the paper pulling roller 5 is rotatably sleeved with a driving sleeve 17, which is fixedly connected to the inner wall of the machine body 1, and an electromagnetic coil 18 is embedded in the driving sleeve 17. Two sections of return springs 19 are arranged inside the sleeve body 12, and the two sections of return springs 19 are respectively pressed against the two ends of the magnetic ring 16. When the electromagnetic coil 18 introduces currents in different directions, a magnetic field that attracts or repels the magnetic ring 16 is generated, driving the magnetic ring 16 to move left and right, thereby driving the movable plate 13 to flip, such as Fig.10 As shown in Figures A and B.

[0025] Two gear transmission shafts 9 are rotatably installed inside the machine body 1, and multiple drive motors are fixedly installed inside the machine body 1. The multiple drive motors respectively drive the central drum 3, multiple paper feeding rollers 4 and the two gear transmission shafts 9 to rotate. The two gear transmission shafts 9 respectively drive the first paper pulling ring 6 and the second paper pulling ring 7 to rotate. The needle sleeve 8 penetrates the surface of the first paper pulling ring 6 and the second paper pulling ring 7, so that the needle sleeve 8 rotates together with the first paper pulling ring 6 and the second paper pulling ring 7.

[0026] The plurality of paper feeding rollers 4 include a first roller 20, a second roller 21 and a third roller 22. Figure 4 As shown, the plurality of driving motors include a first servo motor 23, a second servo motor 24 and two third servo motors 25. Figure 5 shown.

[0027] The rotating end of the first servo motor 23 is fixedly connected to the end of the first roller 20, and the ends of the first roller 20, the second roller 21 and the third roller 22 are fixedly installed with synchronous wheels, and the three synchronous wheels are driven by synchronous belts. The rotating end of the second servo motor 24 is fixedly connected to the end of the center roller 3, and the rotating ends of the two third servo motors 25 are respectively fixedly connected to the ends of the two gear transmission shafts 9. The outer circumferential surfaces of the first paper pulling ring 6 and the second paper pulling ring 7 are both provided with tooth grooves, and the surfaces of the two gear transmission shafts 9 are both provided with gears. The two gear transmission shafts 9 are respectively driven by the meshing transmission of the gears and the tooth grooves to drive the first paper pulling ring 6 and the second paper pulling ring 7 to rotate independently.

[0028] The surfaces of the second roller 21 and the third roller 22 are provided with air holes (not shown in the drawings), and the ends of the second roller 21 and the third roller 22 are connected with the negative pressure air pipe 26 via a rotary joint (the rotary joint is an existing rotating connection component and is not described here in detail), and the negative pressure air pipe 26 is connected with the air holes via the air passage inside the second roller 21 and the third roller 22. Air is extracted from the negative pressure air pipe 26, and the invoice paper can be adsorbed on the surface of the second roller 21 or the third roller 22.

[0029] like Figure 2As shown, a plurality of branching rods 10 are fixedly installed inside the machine body 1, and a plurality of paper discharge windows are provided on the surface of the machine body 1. The chain invoice 11 is divided into pages by the branching rods 10, and the needle sleeve 8 rotates synchronously with the first paper pulling ring 6 or the second paper pulling ring 7. The needle sleeve 8 and the first paper pulling ring 6 or the second paper pulling ring 7 clamp the chain invoice 11 (no tooth holes for auxiliary conveying are required on both sides of the chain invoice 11), and the chain invoice 11 is conveyed. After the pin-type printing assembly 2 completes printing on the chain invoice 11, the paper guide roller 4 is used to separate the chain invoice 11, and the separated pages are discharged from each paper discharge window. The pin-type printing assembly 2 belongs to the prior art and will not be introduced in detail here.

[0030] Specifically, the multiple paper output windows include a first window 27, a second window 28 and a third window 29. The second roller 21 and the third roller 22 are respectively arranged at the entrances of the first window 27 and the second window 28. A storage box 30 is inserted in the third window 29. A plurality of arc-shaped inner lining plates 31 are fixedly installed inside the body 1. The plurality of arc-shaped inner lining plates 31 are arranged in a ring array around the center drum 3, and a gap for conveying the chain-type invoice 11 is reserved with the outer surface of the center drum 3.

[0031] like Figure 2 As shown, taking the three-part chain invoice 11 as an example, the chain invoice 11 is separated into three sub-pages, the second roller 21 and the third roller 22 respectively absorb the first and second layers of sub-pages and guide them into the first window 27 and the second window 28, the top layer of sub-pages are discharged from the first window 27, the middle layer of sub-pages are discharged from the second window 28, and the third layer of sub-pages are discharged from the third window 29 into the storage box 30.

[0032] In this embodiment, there are two first paper pulling rings 6 and two second paper pulling rings 7, which are respectively arranged in the grooves at both ends of the center drum 3, and needle sleeves 8 and driving sleeves 17 are arranged at both ends of the paper pulling roller 5. The outer circumferential surfaces of the first paper pulling ring 6 and the second paper pulling ring 7 are both provided with beef tendon layers, and the surfaces of the beef tendon layers are flush with the outer circumferential surface of the center drum 3. The two needles 14 can be inserted into the beef tendon layers of the first paper pulling ring 6 and the second paper pulling ring 7 respectively.

[0033] By setting a driven rotating needle sleeve 8 on the surface of the paper pulling roller 5, the needle sleeve 8 presses the chain invoice 11 against the surface of the first paper pulling ring 6 and the second paper pulling ring 7, and its needle head 14 can pass through the chain invoice 11 and pierce the surface of the first paper pulling ring 6 or the second paper pulling ring 7. Since the chain invoice 11 is separated before printing, the invoice pages of each layer are easy to deviate. The needle head 14 on the surface of the needle sleeve 8 has the function of tightening the invoice paper and stapling it to prevent deviation. It should be emphasized that if Fig.10 As shown in Figure B, the movable plate 13 is flipped, and the movement trajectory of the needle 14 is an arc outward, and the needle 14 pulls the chain invoice 11 to both sides to avoid wrinkles, thereby achieving the function of tensioning the invoice paper.

[0034] Its working principle needs to be explained. Figure 2 As an example, the two needle sleeves 8 on the upper side paper pulling roller 5 are in the following Fig.10 In the state shown in Figure A, the two needle sleeves 8 on the lower side paper pulling roller 5 are in the state shown in Figure A. Fig.10 The state shown in Figure B is as follows: Fig.11 As shown in Figure C, when the first paper pulling ring 6 is stationary or rotates downward, the second paper pulling ring 7 rotates upward, the speed difference between the first paper pulling ring 6 and the second paper pulling ring 7 can be used to separate the connected invoices at the cutting line, that is, to achieve the output of a single invoice; In addition, refer to Fig.11 As shown in Figure D, the left needle sleeve 8 on the upper side paper pulling roller 5 and the second paper pulling ring 7 clamp the chain invoice 11 (the right needle sleeve 8 is separated from the chain invoice 11, that is, Fig. 9 The movable plate 13 is shown in the state), the right needle sleeve 8 on the lower side paper pulling roller 5 and the first paper pulling ring 6 clamp the chain invoice 11 (the left needle sleeve 8 is separated from the chain invoice 11, that is, Fig. 9 In the state shown by the movable plate 13 in the middle), when the first paper pulling ring 6 rotates downward and the second paper pulling ring 7 rotates upward, the chain invoice 11 can be driven to rotate clockwise by a certain angle. Similarly, when the first paper pulling ring 6 rotates upward and the second paper pulling ring 7 rotates downward, the chain invoice 11 can be driven to rotate counterclockwise by a certain angle. The pin-type printing assembly 2 includes a pin-type printing head that moves left and right along the track. An image sensor is installed on the surface of the pin-type printing head. The image sensor can detect and judge the rotation angle and displacement distance of the dynamic chain invoice 11, thereby achieving the effect of adjusting the transmission angle of the chain invoice 11.

[0035] The present invention is designed with two paper pulling rollers 5, and needle sleeves 8 are arranged at both ends of the two paper pulling rollers 5. The movable plate 13 thereof swings, so that different needles 14 can be respectively inserted into the surfaces of the first paper pulling ring 6 and the second paper pulling ring 7. Not only can the speed difference between the first paper pulling ring 6 and the second paper pulling ring 7 be utilized to separate the connected invoices, but also the first paper pulling ring 6 and the second paper pulling ring 7 can rotate forward and backward to adjust the angle of the chain invoice 11, thereby achieving the effect of correcting the position of the invoice paper, solving the problem of the offset of the text printing position, and improving the printing quality.

[0036] The invoice terminal management printing device arranges paper pulling rollers 5 and paper guide rollers 4 around the central drum 3 and arranges a splitting rod 10 on the lower side to split the chain invoice 11 before printing, and then prints the combined copies, and finally outputs the split copies. The transmission of the invoice paper is more reliable, and the function of automatic splitting is realized, so that the stub copy can be stored separately, and the other copies can be taken away by the printer, meeting the use requirements of the self-service printing terminal.

[0037] The present invention realizes a printing mode of split-joint printing-re-split, thereby reducing the difficulty of splitting after printing, especially when a single invoice is printed, after a blank chain invoice 11 is input and printed, the single invoice is separated by utilizing the speed difference between the first paper pulling ring 6 and the second paper pulling ring 7, and the single invoice can be output in splits at the second roller 21 and the third roller 22, respectively, thereby realizing the effect of printing a single invoice and outputting different split pages, thereby solving the problem that when printing a single invoice, the output needs to be backed up with blank paper, which is easy to wrinkle and deviate.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An invoice terminal management and printing device, comprising a body (1), wherein a pin-matrix printing assembly (2) is arranged inside the body (1), and characterized in that: A central roller (3), a plurality of paper feed rollers (4) and two paper pulling rollers (5) are rotatably mounted inside the machine body (1); a first paper pulling ring (6) and a second paper pulling ring (7) are rotatably mounted on the surface of the central roller (3); a pin-type printing assembly (2) is arranged in an area formed between the two paper pulling rollers (5); and a pin sleeve (8) is arranged on the surface of the paper pulling roller (5); Two gear transmission shafts (9) are rotatably mounted inside the machine body (1), and a plurality of drive motors are fixedly mounted inside the machine body (1). The plurality of drive motors respectively drive the central roller (3), the plurality of paper guide rollers (4) and the two gear transmission shafts (9) to rotate. The two gear transmission shafts (9) respectively drive the first paper guide ring (6) and the second paper guide ring (7) to rotate. The needle sleeve (8) penetrates into the surface of the first paper guide ring (6) and the second paper guide ring (7), so that the needle sleeve (8) rotates together with the first paper guide ring (6) and the second paper guide ring (7). A plurality of splitting rods (10) are fixedly installed inside the machine body (1), and a plurality of paper discharge windows are opened on the surface of the machine body (1). The chain invoice (11) is split into paging states by the splitting rods (10), and the needle sleeve (8) rotates synchronously with the first paper pulling ring (6) or the second paper pulling ring (7) to transport the chain invoice (11). After the needle printing component (2) completes printing on the chain invoice (11), the paper guide roller (4) is used to split the chain invoice (11), and the split pages are discharged from each paper discharge window.

2. The invoice terminal management and printing device according to claim 1, characterized in that: The needle sleeve (8) comprises a sleeve body (12), the surface of the sleeve body (12) is provided with a plurality of sheet grooves arranged in a ring-shaped array, a movable plate (13) is rotatably mounted in each sheet groove, two needle heads (14) are fixedly mounted on the surface of the movable plate (13), a connecting ball (15) is fixedly mounted on the inner side of the movable plate (13), a magnetic ring (16) is slidably mounted inside the sleeve body (12), a connecting groove is provided on the surface of the magnetic ring (16), and the connecting ball (15) extends into the connecting groove.

3. The invoice terminal management and printing device according to claim 2, characterized in that: The end rotating sleeve of the paper pulling roller (5) is provided with a driving sleeve (17), the driving sleeve (17) is fixedly connected to the inner wall of the machine body (1), and an electromagnetic coil (18) is embedded in the driving sleeve (17), and two sections of return springs (19) are provided in the sleeve body (12), and the two sections of return springs (19) are respectively pressed against the two ends of the magnetic ring (16).

4. The invoice terminal management and printing device according to claim 3, characterized in that: There are two first paper pulling rings (6) and two second paper pulling rings (7), which are respectively arranged in grooves at both ends of the central roller (3). Both ends of the paper pulling roller (5) are provided with needle sleeves (8) and drive sleeves (17). The outer circumferential surfaces of the first paper pulling ring (6) and the second paper pulling ring (7) are provided with beef tendon layers, the surfaces of the beef tendon layers are flush with the outer circumferential surface of the central roller (3), and the two needles (14) can respectively penetrate into the beef tendon layers of the first paper pulling ring (6) and the second paper pulling ring (7).

5. The invoice terminal management and printing device according to claim 4, characterized in that: The plurality of paper guiding rollers (4) include a first roller (20), a second roller (21) and a third roller (22), and the plurality of driving motors include a first servo motor (23), a second servo motor (24) and two third servo motors (25).

6. The invoice terminal management and printing device according to claim 5, characterized in that: The rotating end of the first servo motor (23) is fixedly connected to the end of the first roller (20); the ends of the first roller (20), the second roller (21) and the third roller (22) are all fixedly mounted with synchronous wheels; the three synchronous wheels are driven by synchronous belts; the rotating end of the second servo motor (24) is fixedly connected to the end of the center roller (3); the rotating ends of the two third servo motors (25) are respectively fixedly connected to the ends of the two gear transmission shafts (9); the outer circumferential surfaces of the first paper pulling ring (6) and the second paper pulling ring (7) are both provided with tooth grooves; the surfaces of the two gear transmission shafts (9) are both provided with gears; the two gear transmission shafts (9) are respectively driven by meshing of the gears and the tooth grooves to drive the first paper pulling ring (6) and the second paper pulling ring (7) to rotate independently.

7. The invoice terminal management and printing device according to claim 6, characterized in that: Air holes are provided on the surfaces of the second roller (21) and the third roller (22); the ends of the second roller (21) and the third roller (22) are connected to negative pressure air pipes (26) via rotary joints; the negative pressure air pipes (26) are connected to the air holes via air passages inside the second roller (21) and the third roller (22).

8. The invoice terminal management and printing device according to claim 7, characterized in that: The plurality of paper outlet windows comprise a first window (27), a second window (28) and a third window (29); the second roller (21) and the third roller (22) are respectively arranged at the entrances of the first window (27) and the second window (28); and a storage box (30) is inserted into the third window (29).

9. The invoice terminal management and printing device according to claim 8, characterized in that: A plurality of arc-shaped inner lining plates (31) are fixedly installed inside the machine body (1). The plurality of arc-shaped inner lining plates (31) are arranged in a ring-shaped array around the central roller (3), and a gap is reserved between the outer surface of the central roller (3) for conveying chain-type invoices (11).

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