Sheet-fed inkjet printer printing roller flipping mechanism

Abstract

The present invention provides a sheet-fed inkjet printer printing roller flipping mechanism, comprising a format adjustment component and an even-number flipping roller, a flipping roller and a paper transfer roller installed in parallel on one side thereof, the format adjustment component is used to adjust the format of the paper, a cam adjustment unit for adjusting the paper head cam is installed on one side of the even-number flipping roller, and the format adjustment component and the cam adjustment unit are respectively connected to a controller by signal. The sheet-fed inkjet printer printing roller flipping mechanism described in the present invention is preset through the cam adjustment unit and the format adjustment component during the entire operation process, and positioning is performed only once when preset, and the position of the paper is controlled and will not move, effectively ensuring the printing accuracy and printing speed.

Description

Technical Field

[0001] The invention belongs to the field of inkjet printer printing, and in particular relates to a printing roller turning mechanism of a sheet-fed inkjet printer. Background Art

[0002] Due to the particularity of sheet-fed inkjet printers, double-sided printing is a standard feature. How to achieve efficient double-sided printing is a problem we need to consider. And paper flipping technology is precisely the main technical core of double-sided printing. At present, HP Indingo series feeder printing presses put the paper on the flipping table, perform secondary positioning, and then transfer it to the printing cylinder for reverse printing. Due to the secondary positioning, the printing accuracy is affected, and the maximum printing speed is also limited. Summary of the invention

[0003] In view of this, the present invention aims to provide a printing roller flipping mechanism for a sheet-fed inkjet printer, in order to solve the problem that the printing accuracy and printing speed are affected by secondary positioning when the existing printing press prints on both sides.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A sheet-fed inkjet printer printing roller flipping mechanism comprises a format adjustment component and an even-number flipping roller, a flipping roller and a paper transfer roller installed in parallel on one side thereof. The format adjustment component is used to adjust the format of paper. A cam adjustment unit for adjusting a paper head cam is installed on one side of the even-number flipping roller. Signals of the format adjustment component and the cam adjustment unit are respectively connected to a controller.

[0006] Furthermore, the even-number flipping roller includes a roller bearing, the outer portion of the roller bearing is sleeved with a roller adjustment gear and a roller support plate, a number of No. 1 roller paper boards and No. 2 roller paper boards are alternately arranged between the roller adjustment gear and the roller support plate, each No. 1 roller paper board is fixedly connected to the paper tail paper holding unit, and each No. 2 roller paper board is fixedly connected to the paper head paper holding unit.

[0007] Furthermore, the paper tail gripping unit includes a paper tail cam, paper tail gripping teeth, a paper tail tensioning tooth pad, and a paper tail tooth pad cam. A paper tail tooth pad cam and a paper tail cam are arranged in sequence on the outer side of the roller adjustment gear. A paper tail tensioning tooth pad and a paper tail gripping shaft are installed between the roller adjustment gear and the roller support plate. A number of paper tail gripping teeth are evenly distributed on the paper tail gripping shaft. The positions of the paper tail gripping teeth match the positions of the paper tail tensioning tooth pad, so that the paper tail gripping teeth can cooperate with the paper tail tensioning tooth pad to complete paper gripping and paper placing under the drive of external force. The roller outside the paper tail tensioning tooth pad cooperates with the paper tail tooth pad cam to complete the tensioning control of the paper tail tensioning tooth pad.

[0008] Furthermore, the flip roller includes a bearing and a flip roller cam movably sleeved on its outside, and a number of fixed support plates. The outsides of the several support plates are fixedly connected to a paper gripping tooth row. The paper gripping tooth row cooperates with the flip roller cam to control paper gripping and paper releasing. The two ends of the bearing are respectively connected to the cam adjustment unit and the format adjustment component.

[0009] Furthermore, the paper gripping tooth row includes a No. 1 gear block, a No. 2 gear block, a paper gripping shaft, and a tooth pad plate. An end plate is respectively installed on the support plates at both ends, and the tooth pad plate and the paper gripping shaft are installed between the two end plates. The No. 1 gear block is fixedly sleeved on both sides of the paper gripping shaft, and the No. 1 gear block is meshed with a rack set on one side of the flip roller cam to control the opening and closing of the tooth row; a number of paper gripping teeth are evenly distributed on the paper gripping shaft, and the paper gripping teeth cooperate with the tooth pad plate to control the gripping and release of paper.

[0010] Furthermore, the cam adjustment unit includes a cam adjustment motor, which is connected to the paper head cam and drives the paper head cam to rotate, and the cam adjustment motor signal is connected to the controller.

[0011] Furthermore, the cam adjustment unit includes a driving gear and a cam locking structure for limiting the driving gear. The cam adjustment motor and the paper head cam are fixed to both sides of the driving gear respectively. The cam adjustment motor and the cam locking structure are respectively connected to the controller by signal.

[0012] Furthermore, the width adjustment component includes a roller adjustment gear, a width adjustment gear, a paper transfer adjustment gear, a width locking structure and a width adjustment motor. The two ends of the bearing of the flipping roller are respectively fixedly sleeved with the width adjustment gear and the flipping roller driving gear, the flipping roller driving gear is fixedly connected to the width adjustment motor, the outer side of the width adjustment gear is provided with a width locking structure, and the two sides are respectively meshed with the roller adjustment gear and the paper transfer adjustment gear, the inside of the paper transfer adjustment gear is fixedly sleeved with the bearing of the paper transfer roller, the inside of the roller adjustment gear is fixedly sleeved with the bearing of the even-numbered flipping roller, and the width locking structure and the width adjustment motor are respectively connected to the controller by signal.

[0013] Compared with the prior art, the printing roller flipping mechanism of the sheet-fed inkjet printer described in the present invention has the following advantages:

[0014] (1) The printing roller flipping mechanism of the sheet-fed inkjet printer described in the present invention is preset through the cam adjustment unit and the format adjustment component during the entire operation process, and positioning is only performed once when preset. In addition, the position of the paper is controlled and will not move, thereby effectively ensuring the printing accuracy and printing speed.

[0015] (2) In the sheet-fed inkjet printer printing roller flipping mechanism described in the present invention, the roller and other main components perform rotational motion during the entire process, and the speed can be guaranteed, which is suitable for high-speed printing.

[0016] (3) The cam locking structure and the format locking structure of the printing roller flipping mechanism of the single-sheet inkjet printer described in the present invention ensure the stability of the flipping mechanism, can be controlled by a controller, have a high degree of automation, simplify the operating steps, and improve work efficiency.

[0017] (4) The sheet-fed inkjet printer printing roller flipping mechanism of the present invention is provided with a paper gripper row that can flip more than 200 degrees, and can grip the tail of the paper on the even-numbered flipping roller and flip the paper over, thereby completing the paper flipping function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the printing cylinder turning mechanism of the sheet-fed inkjet printer according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0021] Figure 3 Schematic diagram of the printing roller flipping mechanism of the sheet-fed inkjet printer according to the embodiment of the present invention Figure 2 ;

[0022] Figure 4 It is a schematic diagram of an even-number-fold turning drum according to an embodiment of the present invention;

[0023] Figure 5 This is a front view of the even-number-fold turning drum according to an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the turning drum according to the embodiment of the present invention Figure 1 ;

[0025] Figure 7 Schematic diagram of the turning drum according to the embodiment of the present invention Figure 2 ;

[0026] Figure 8 It is a schematic diagram of a width adjustment component according to an embodiment of the present invention;

[0027] Fig. 9 A side view of the width adjustment gear according to an embodiment of the present invention;

[0028] Fig.10 for Fig. 9 AA section view.

[0029] Description of reference numerals:

[0030] 1-even-number reversing roller; 11-paper tail cam; 12-paper tail gripper; 13-paper tail tensioning tooth pad; 14-paper tail tooth pad cam; 15-paper head gripper; 16-roller adjustment gear; 17-roller bearing; 18-No. 1 rolling paper board; 19-No. 2 rolling paper board; 110-paper head cam; 111-roller support plate; 2-reversing roller; 21-support plate; 22-end plate; 23-bearing; 24-paper gripper row; 241-No. 1 gear block; 242-No. 2 gear block; 243-paper gripper shaft; 244-tooth pad; 245-paper gripper; 25-reversing roller driving gear; 26-reversing roller cam; 3-paper transfer roller; 4-cam adjustment unit; 41-cam adjustment motor; 42-drive Moving gear; 43-cam locking structure; 431-cam locking cylinder; 432-cam locking lever; 433-pressing block; 5-width adjustment component; 51-adjusting gear; 52-intermediate gear; 521-intermediate gear No. 1; 522-intermediate gear No. 2; 523-intermediate gear No. 3; 524-intermediate gear No. 4; 53-width adjustment gear; 531-interface; 532-housing; 533-width gear No. 1; 534-width gear No. 2; 535-connector; 536-limiting block; 537-connecting piece; 54-paper transfer adjustment gear; 55-width locking structure; 551-width locking lever; 552-width locking cylinder; 56-width adjustment intermediate gear; 57-width adjustment motor. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] Sheet-fed inkjet printer printing roller flipping mechanism, such as Figures 1 to 10 As shown, it includes a format adjustment component 5 and an even-number flip roller 1, a flip roller 2 and a paper transfer roller 3 installed in parallel on one side thereof. The format adjustment component 5 is used to adjust the format of the paper, and a cam adjustment unit 4 for adjusting the paper head cam 110 is installed on one side of the even-number flip roller 1.

[0036] like Figures 3 to 5 The even-numbered flip roller 1 includes a paper tail cam 11, a paper tail gripper 12, a paper tail tensioning tooth pad 13, a paper tail tooth pad cam 14, a paper head gripper 15, a roller adjustment gear 16, a roller bearing 17, a No. 1 rolling paper board 18, a No. 2 rolling paper board 19 and a paper head cam 110. The roller bearing 17 is externally sleeved with the roller adjustment gear 16 and the roller support plate 111. A number of No. 1 rolling paper boards 18 and No. 2 rolling paper boards 19 are alternately arranged between the roller adjustment gear 16 and the roller support plate 111. Each No. 1 rolling paper board 18 is fixedly connected to a paper tail gripper unit for gripping the paper tail, and each No. 2 rolling paper board 19 is fixedly connected to a paper head gripper unit for gripping the paper head.

[0037] Preferably, the paper tail gripping unit comprises a paper tail cam 11, paper tail gripping teeth 12, a paper tail tensioning tooth pad 13, and a paper tail tooth pad cam 14. The outer side of the roller adjustment gear 16 is provided with a paper tail tooth pad cam 14 and a paper tail cam 11 in sequence. The paper tail tensioning tooth pad 13 and a paper tail gripping shaft are installed between the roller adjustment gear 16 and the roller support plate 111. A plurality of paper tail gripping teeth 12 are evenly distributed on the paper tail gripping shaft. The positions of the paper tail gripping teeth 12 match the positions of the paper tail tensioning tooth pad 13, so that the paper tail gripping teeth 12 can cooperate with the paper tail tensioning tooth pad 13 under the drive of an external force. To complete the paper gripping and paper placing, the paper tail tensioning tooth pad 13 is fixedly connected to each No. 1 paper rolling board 18; the roller arranged outside the paper tail gripping shaft cooperates with the paper tail cam 11 to complete the opening and closing control of the paper tail gripping teeth 12, and the roller outside the paper tail tensioning tooth pad 13 cooperates with the paper tail tooth pad cam 14 to complete the tensioning control of the paper tail tensioning tooth pad 13. The coordination relationship and working principle of the cam and the opening and closing of the gripping tooth row are all prior art, which will not be repeated here. Please refer to the literature "Manufacturing method of opening and closing device of paper gripping teeth of printing machine" or "Structure and adjustment of paper gripping teeth of offset printing machine".

[0038] The structure of the paper head gripping unit and the paper tail gripping unit is exactly the same, and will not be repeated here. In order to facilitate the description of the working principle, the paper head gripping unit is only marked with the paper head gripping teeth 15 and the paper head cam 110 in the figure.

[0039] The even-number-fold turning roller 1 is a paper tail-grabbing turning mechanism. The even-number-fold turning roller 1 mainly functions to transfer paper. During the transfer process, the paper head and paper tail are grasped and the paper is flattened.

[0040] like Figure 1 and Figure 2 The cam adjustment unit 4 includes a cam adjustment motor 41, a driving gear 42 and a cam locking structure 43. The cam adjustment motor 41 is fixedly connected to the driving gear 42. The driving gear 42 is coaxially arranged with the even-number flip roller 1, and the driving gear 42 is fixedly connected to the paper head cam 110, thereby driving the paper head cam 110 to rotate. The cam locking structure 43 is installed on an external supporting mechanism and is used to limit the driving gear 42. The cam adjustment motor 41 and the cam locking structure 43 are respectively connected to the controller by signals.

[0041] In one or more embodiments, the cam locking structure 43 includes a cam locking cylinder 431, a cam locking lever 432 and a pressure block 433. The cam locking cylinder 431 signal is connected to the controller, the cam locking cylinder 431 is fixedly connected to the cam locking lever 432, the cam locking lever 432 is connected to the pressure block 433 through a connecting rod, and the pressure block 433 is located on the side of the driving gear 42 close to the paper head cam 110.

[0042] Preferably, the connecting rod is sleeved in the through hole of the external support mechanism, so that the cam locking lever 432 and the paper head cam 110 are respectively located on both sides of the external support mechanism without affecting the movement of the cam locking lever 432.

[0043] In one or more embodiments, the cam adjustment motor 41 is located on one side of the even-numbered flip roller 1, and the cam adjustment motor 41 is fixedly connected to the cam adjustment intermediate gear. The cam adjustment intermediate gear and the driving gear 42 make the position of the cam adjustment motor 41 not coaxial with the roller bearing 17, thereby not affecting the connection between the roller bearing 17 and the external device. This design makes the entire structure of the present solution more compact.

[0044] The working principle of the cam adjustment unit 4 is as follows: the staff presets the paper according to the paper specifications to ensure that the paper tail can be accurately gripped during the flipping process. The paper preset data has been stored in the controller, and the staff only needs to input the parameters; the staff controls the cam adjustment motor 41 to work through the controller, and the cam adjustment motor 41 (preferably a servo motor) rotates through the cam adjustment intermediate gear and the drive gear 42. Since the drive gear 42 is fixedly connected to the paper head cam 110, the paper head cam 110 also rotates to the set position. After the controller determines that the cam adjustment motor 41 has reached the rotation angle (it can be achieved by installing a sensor to send a signal to the controller, or by delaying the controller), the controller controls the cam locking cylinder 431 to work, and the cam locking cylinder 431 drives the cam locking lever 432 to move outward, and the cam locking lever 432 drives the pressure block 433 to move outward until the pressure block 433 presses the drive gear 42 and fixes the drive gear 42, thereby ensuring the stability of the cam adjustment unit 4 in the closed state.

[0045] The position of the paper head cam 110 can ensure that the double turning roller 1 can hold the paper head and paper tail of the paper.

[0046] During the rotation of the roller bearing 17, the paper tail gripper 12 flattens the paper. When it turns to the handover position, the flipping roller 2 grips the paper tail to flip the paper over, completing the flipping, and continues to rotate to transfer the paper to the paper transfer roller 3.

[0047] The first rolling paper board 18 and the second rolling paper board 19 are both arc-shaped boards, which are convenient for paper transfer.

[0048] The turning roller 2 is a single-diameter turning roller.

[0049] like Figure 6 and Figure 7The flip roller 2 includes a support plate 21, an end plate 22, a paper gripper row 24 and a flip roller cam 26. The bearing 23 is fixedly sleeved on the outside of the support plates 21 and movably sleeved on the flip roller cam 26. The flip roller cam 26 is respectively located at both ends of the support plates 21. The outsides of the support plates 21 are fixedly connected to the paper gripper row 24. The two ends of the bearing 23 are respectively connected to the cam adjustment unit 4 and the width adjustment component 5.

[0050] The paper gripper row 24 includes a No. 1 gear block 241, a No. 2 gear block 242, a paper gripper shaft 243, and a tooth pad 244. An end plate 22 is respectively installed on the support plates 21 on both sides, and the tooth pad 244 and the paper gripper shaft 243 are installed between the two end plates 22. The No. 1 gear block 241 is fixedly sleeved on both sides of the paper gripper shaft 243. The No. 1 gear block 241 is meshed with a rack set on one side of the flip roller cam 26 to control the opening and closing of the tooth row. A number of paper grippers 245 are evenly distributed on the paper gripper shaft 243. The paper grippers 245 cooperate with the tooth pad 244 to grip the paper, and the paper grippers 245 are in contact with the tooth pad 244 to form a paper gripping state.

[0051] The working principle of the paper gripper row 24 is as follows: the flip roller cam 26 is fixed on the external support mechanism, and the bearing 23 rotates under the drive of external force, thereby driving the support plate 21 and the paper gripper row 24 to rotate, and the No. 1 gear block 214 rotates and engages with the rack on one side of the flip roller cam 26. Since the No. 1 gear block 241 is fixedly connected to the paper gripper shaft 243, the paper gripper shaft 243 moves relative to the flip roller cam 26 and drives the flipping of the paper gripper 245. This structure can flip more than 200 degrees, can hold the tail of the paper on the even-numbered flip roller 1, and flip the paper over, completing the paper flipping function, and continuing to rotate and transfer it to the paper transfer roller 3.

[0052] The outer side of the end plate 22 is fixedly connected to the second gear block 242 for engaging with the paper transfer roller 3; the paper transfer roller 3 is an ordinary paper transfer roller and only plays the role of paper transfer.

[0053] In one or more embodiments, the flip roller 2 is driven to rotate by an external device, and the flip roller 2 engages with the paper transfer roller 3 through the second gear block 242 to provide driving force to the paper transfer roller 3. This structure reduces one driving device, greatly reduces production costs, and saves equipment space, making the equipment more compact; one drive can drive two devices, and also avoids the error of control accuracy when using two drives, so that the paper control accuracy is higher.

[0054] like Figures 8 to 10The width adjustment component 5 includes an adjustment gear 51, an intermediate gear 52, a width adjustment gear 53, a paper transfer adjustment gear 54, a width locking structure 55, a width adjustment intermediate gear 56 and a width adjustment motor 57. The two ends of the bearing 23 are respectively fixedly sleeved with the width adjustment gear 53 and the flip roller driving gear 25, the flip roller driving gear 25 is meshed with the width adjustment intermediate gear 56, the width adjustment intermediate gear 56 is internally fixedly sleeved with the bearing 23, the width adjustment intermediate gear 56 is fixedly connected to the output shaft of the width adjustment motor 57, the width adjustment motor 57 is a servo motor, and the width adjustment motor 57 is connected to the controller by signal; the width adjustment gear 53 is provided with a width locking structure 55 on the outer side, and the two sides are respectively meshed with the adjustment gear 51 and the paper transfer adjustment gear 54, the paper transfer adjustment gear 54 is internally fixedly sleeved with the bearing of the paper transfer roller 3, the adjustment gear 51 is internally fixedly sleeved with the roller bearing 17, and the width locking structure 55 and the width adjustment motor 57 are respectively connected to the controller by signal.

[0055] Preferably, the web locking structure 55 comprises a web locking lever 551 and a web locking cylinder 552 fixedly connected at one end thereof, and the signal of the web locking cylinder 552 is connected to the controller.

[0056] In one or more embodiments, the width adjustment gear 53 includes an interface 531, a housing 532, a first width gear 533, and a second width gear 534, which are connected in sequence from the outside to the inside. The first width gear 533 and the second width gear 534 are connected by a connecting piece 537. A limit block 536 and an interface 531 are installed inside the housing 532. A plug-in 535 is installed inside the interface 531. One end of the plug-in 535 cooperates with the plug-in width locking lever 551, so that the plug-in 53 5 can move left and right along the interface 531 under the drive of the web locking lever 551. Preferably, a spring is provided on the connector 535, and the spring is located on the side away from the web locking lever 551. A limit block 536 is provided at the other end of the connector 535. The limit block 536 can move left and right in the housing 532 under the action of external force, and a gap is provided between the limit block 536 and the connecting member 537. The first web gear 533 is meshed with the adjustment gear 51, and the second web gear 534 is meshed with the paper feeding adjustment gear 54.

[0057] Preferably, the adjustment gear 51, the first width gear 533, the second width gear 534, and the paper transfer adjustment gear 54 are all helical gears.

[0058] A scale is provided on the outside of the housing 532 to allow for secondary calibration of the rotation angle of the drum.

[0059] Preferably, the width adjustment gear 53 is transmission-connected to the adjustment gear 51 via the intermediate gear 52 .

[0060] The intermediate gear 52 includes a first intermediate gear 521, a second intermediate gear 522, a third intermediate gear 523 and a fourth intermediate gear 524. The first intermediate gear 521 and the second intermediate gear 522 are coaxially fixed, the third intermediate gear 523 and the fourth intermediate gear 524 are coaxially fixed, the first intermediate gear 521 is meshed with the second width gear 534, the second intermediate gear 522 is meshed with the third intermediate gear 523, the fourth intermediate gear 524 is meshed with the roller adjustment gear 16, and the first intermediate gear 521 is a helical gear.

[0061] The working principle of the width adjustment component 5 is as follows: initially, the width locking lever 551 is inserted into the interface 531 and contacts the connector 535. The staff inputs data into the controller according to the actual width adjustment requirements. The controller controls the width adjustment motor 57 to rotate. The width adjustment motor 57 drives the flip roller 2 to rotate through the width adjustment intermediate gear 56. Since the width adjustment gear 53 is respectively engaged with the paper transfer adjustment gear 54 and the adjustment gear 51, when the flip roller 2 rotates, the even-numbered flip roller 1 and the paper transfer roller 3 rotate at the same time. When the width adjustment motor 57 stops rotating (that is, the three rollers reach the preset position),

[0062] The controller controls the movement of the web locking cylinder 552, and the web locking cylinder 552 drives the web locking lever 551 to press the connector 535 inwardly. The connector 535 moves inwardly and drives the limit block 536 to approach the connecting piece 537 until the connecting piece 537 is pressed, so that the web adjusting gear 53 as a whole cannot move left or right. Since the adjusting gear 51, the first web gear 533, the second web gear 534, the paper transfer adjusting gear 54 and the first intermediate gear 521 are all helical gears, when the first web gear 533 and the second web gear 534 move toward the inside of the drum, the adjusting gear 51, the intermediate gear 52 and the paper transfer adjusting gear 54 will be driven to move collectively toward the inside of the drum and be fixed, and cannot move along the axial direction of the drum, but can only rotate circumferentially under the drive of external force, so that the present scheme has a high degree of automation and makes the operation simple. At the same time, during the entire operation process, the position of the paper is controlled and will not move, which affects the accuracy.

[0063] When the processing of the current batch of paper is completed and the next batch of paper is to be printed, the staff opens the format locking cylinder 552 through the controller, and the format locking cylinder 552 drives the format locking lever 551 to move outward. Since the connector 535 is provided with a spring, the spring overcomes the elastic force to restore the deformation, and the connector 535 drives the limit block 536 to move outward inside the housing 532 and return to the initial position, and finally the format adjustment gear 53, the adjustment gear 51, the intermediate gear 52 and the paper transfer adjustment gear 54 can move left and right along the axis under the action of external force, and enter the next format adjustment cycle. The controller mentioned in this article is the controller or control system of the external assembly line, and can also be the controller or control system of the printing press.

[0064] The working principle of the printing roller flipping mechanism of the single-sheet inkjet printer is as follows: the staff first presets the paper according to the paper specifications (adjusts the position of the paper head cam 110 through the cam adjustment unit 4, and adjusts the paper width through the width adjustment component 5) to ensure that during the flipping process, the paper tail in the double flip roller 1 can be accurately gripped by the paper gripper 245. During the rotation of the double flip roller 1, the paper head gripper 15 and the paper tail gripper 12 grip the paper head and paper tail of the paper respectively. During the rotation of the roller bearing 17, the paper tail gripper 12 flattens the paper. When it reaches the junction of the double flip roller 1 and the flip roller 2, the flip roller 2 grips the paper tail to flip the paper over, completing the flipping, and continues to rotate to transfer it to the paper transfer roller 3.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The printing cylinder flipping mechanism of the sheet-fed inkjet printer is characterized by: It includes a format adjustment component and an even-number-fold reversing roller, a reversing roller and a paper transfer roller installed in parallel on one side thereof. The even-number-fold reversing roller includes a paper head gripper, a paper tail gripper and a paper head cam. The format adjustment component is used to adjust the format of the paper. A cam adjustment unit for adjusting the position of the paper head cam is installed on one side of the even-number-fold reversing roller. The cam adjustment unit includes a cam adjustment motor. The cam adjustment motor is connected to the paper head cam and drives the paper head cam to rotate. The cam adjustment motor signal is connected to a controller. The format adjustment component and the cam adjustment unit are respectively connected to the controller by signal. The width adjustment component includes an adjustment gear, a width adjustment gear, a paper transfer adjustment gear, a width locking structure and a width adjustment motor. The two ends of the bearing of the flip roller are respectively fixedly sleeved with the width adjustment gear and the flip roller driving gear. The flip roller driving gear is fixedly connected to the width adjustment motor. The width adjustment gear is provided with a width locking structure on the outside, and the two sides are respectively meshed with the adjustment gear and the paper transfer adjustment gear. The inside of the paper transfer adjustment gear is fixedly sleeved with the bearing of the paper transfer roller. The inside of the adjustment gear is fixedly sleeved with the bearing of the even-number flip roller. The width locking structure and the width adjustment motor are respectively connected to the controller by signal. The width locking structure includes a width locking lever and a width locking cylinder fixedly connected at one end thereof. During the rotation of the even-number flipping roller, the head paper gripper and tail paper gripper hold the head and tail of the paper respectively. When it reaches the junction of the even-number flipping roller and the flipping roller, the flipping roller holds the tail paper and flips the paper over to complete the flipping, and continues to rotate to transfer it to the paper transfer roller.

2. The printing cylinder turning mechanism of a sheet-fed inkjet printer according to claim 1 is characterized in that: The even-numbered flipping roller includes a roller bearing, and the two ends of the outer side of the roller bearing are respectively sleeved with a roller adjustment gear and a roller support plate, and a number of No. 1 roller paper boards and No. 2 roller paper boards are alternately arranged between the roller adjustment gear and the roller support plate, and each No. 1 roller paper board is fixedly connected to the paper tail paper holding unit, and each No. 2 roller paper board is fixedly connected to the paper head paper holding unit.

3. The printing cylinder turning mechanism of a sheet-fed inkjet printer according to claim 2 is characterized in that: The paper tail gripping unit comprises a paper tail cam, paper tail gripping teeth, a paper tail tensioning tooth pad, and a paper tail tooth pad cam. A paper tail tooth pad cam and a paper tail cam are arranged in sequence on the outer side of the roller adjustment gear. A paper tail tensioning tooth pad and a paper tail gripping shaft are installed between the roller adjustment gear and the roller support plate. A number of paper tail gripping teeth are evenly distributed on the paper tail gripping shaft. The positions of the paper tail gripping teeth match the positions of the paper tail tensioning tooth pad, so that the paper tail gripping teeth can cooperate with the paper tail tensioning tooth pad to complete gripping and paper placing under the drive of external force. The roller outside the paper tail tensioning tooth pad cooperates with the paper tail tooth pad cam to complete the tensioning control of the paper tail tensioning tooth pad.

4. The printing cylinder turning mechanism of a sheet-fed inkjet printer according to claim 1 is characterized in that: The flip roller includes a bearing and a flip roller cam with a movable sleeve outside thereof, and a plurality of fixed sleeve support plates. The outsides of the plurality of support plates are fixedly connected to a paper gripper row. The paper gripper row cooperates with the flip roller cam to control gripping and releasing of paper. One end of the bearing is connected to a width adjustment component.

5. The printing cylinder turning mechanism of a sheet-fed inkjet printer according to claim 4 is characterized in that: The paper gripper row includes a No. 1 gear block, a No. 2 gear block, a paper gripper shaft, and a tooth pad plate. An end plate is respectively installed on the support plates at both ends, and the tooth pad plate and the paper gripper shaft are installed between the two end plates. The No. 1 gear block is fixedly sleeved on both sides of the paper gripper shaft. The No. 1 gear block is meshed with a rack set on one side of the flip roller cam to control the opening and closing of the tooth row; a number of paper grippers are evenly distributed on the paper gripper shaft, and the paper grippers cooperate with the tooth pad plate to control the gripping and release of paper.

6. The printing cylinder turning mechanism of a sheet-fed inkjet printer according to claim 1 is characterized in that: The cam adjustment unit includes a driving gear and a cam locking structure for limiting the driving gear. The cam adjustment motor and the paper head cam are fixedly connected to both sides of the driving gear. The cam adjustment motor and the cam locking structure are respectively connected to the controller by signals.

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