CN208263756U - Sheet turnover mechanism and printing device - Google Patents

Abstract

The utility model provides a kind of sheet turnover mechanism and printing device, and sheet turnover mechanism includes inverting units and paper commutation portion, and paper turning channel is formed between inverting units and paper commutation portion；Inverting units include fixation member and movable member, fixation member is fixedly connected with the shell of printing device, movable member is connected with driving part, and driving part is used to drive the length direction in movable member edge overturning channel separate or close to fixation member, to adjust the length for overturning channel.The sheet turnover mechanism of the utility model can adjust the length in paper turning channel, so that the length range that printer can be applicable in paper is wider, avoid the generation of paper jam phenomenon；Adjustable overturning channel can also select suitable length according to the paper of different length, shorten the paper turning time, and then improve printing effect.

Description

Sheet turnover mechanism and printing device

Technical field

The utility model relates to inkjet printer technologies field more particularly to a kind of sheet turnover mechanisms and printing device.

Background technique

Printing device is one of output equipment of computer, for by the operation result of computer or intermediate result with people institute The forms such as number, letter, symbol and the figure that can be identified are imprinted on paper according to defined format.Wherein, sheet turnover mechanism makes It obtains and can be realized automatic turnover in printing with a piece of paper, be the basis for realizing paper double side printing function.

Fig. 1 is the structure diagram of printing device in the prior art；Please refer to Fig. 1.Printing device in the prior art includes For storing the stack portion 100 of paper to be printed, multiple paper to be printed are equipped in stack portion 100.In the top of stack portion 100 Equipped with paper pick-up roller 110, paper to be printed can be sent into the tail portion diverter 200 being connected with stack portion 100 by paper pick-up roller 110. Tail portion diverter 200 is in arc-shaped, and paper to be printed can turn an angle after tail portion diverter 200 and be admitted to anti- Turn in unit 300.The front end of inverting units 300 is hingedly connected with reversible deflector 310, and when original state, reversible deflector 310 is upward It tilts, closes the transfer passage between inverting units 300 and conveying roller 400；When paper to be printed passes through reversible deflector 310 When, due to the effect of paper self gravity, reversible deflector 310 is moved down, thus connection inverting units 300 and conveying roller 400 Between transfer passage, the conveying of paper can be completed.Sensor is additionally provided between inverting units 300 and conveying roller 400 500, sensor 500 is able to detect the position of paper and information is fed back to control unit, and control unit can be issued to drive motor Control instruction is to control the rotation direction of each conveying roller.Conveying roller 400 rotates forward can be by paper sheet delivery to be printed to printing Portion 600, the top of printing portion 600 are equipped with record head 610, and record head 610 is removably arranged on balladeur train, the balladeur train can along with The width direction (i.e. perpendicular to the direction of paper in Fig. 1) of paper moves back and forth, and such as ink-jet record can be used in record head 610 Head etc., record head 610 are based on image information selectively from multiple outlets discharge ink to form image on paper.To realize To the duplex printing of paper, being additionally provided with paper commutation portion 700 in the downstream of inverting units 300, (i.e. paper is carrying out duplex printing When first pass through paper commutation portion 700, enter back into inverting units 300), between inverting units 300 and paper commutation portion 700 formed supply The overturning channel that paper passes through, after the completion of the printout surface of paper, rotating backward conveying roller 400 can will be in printing portion 600 Paper to the direction of inverting units 300 convey, at this point, paper will be admitted to instead since reversible deflector 310 is upturned again In the paper commutation portion 700 for turning 300 lower section of unit, paper commutation portion 700 is also in arc-shaped, and paper is entering paper commutation portion Before 700, the surface printed upward, turns an angle behind paper commutation portion 700, thus make to have printed Surface downward, and upward by the unprinted back side；Paper continuation is fed forward along inverting units 300, is kept off through commutation It is sent in printing portion 600 again after plate 310 and conveying roller 400, completes the printing at the back side.Paper after the completion of printing is through being discharged It is expelled to after roller 800 in pallet 900, to complete whole printing process.

But the overturning formed between its inverting units 300 and paper commutation portion 700 in printing device in the prior art The length in channel is fixed and invariable, namely when carrying out duplex printing, the overturning path that paper is passed through is fixed.If to The length of print paper is greater than preset full-length, and the first end of paper is easily caused to overturn when paper is overturn At, and second end does not pass through conveying roller 400 still, so that paper first end and second end be made to occur to push and cause paper jam phenomenon Generation, influence printing effect；If yardage to be printed is less than preset full-length, duplex printing is carried out in paper When, the overturning path passed through is greater than its required minimal path, also will affect printing effect.

Utility model content

In order to overcome the drawbacks described above under the prior art, the purpose of this utility model is to provide a kind of sheet turnover mechanisms And printing device, the sheet turnover mechanism of the utility model can adjust the length in paper turning channel, so that printer The length range that paper can be applicable in is wider, avoids the generation of paper jam phenomenon；Adjustable overturning channel can also be according to difference The paper of length select suitable length, shorten the paper turning time, and then improve printing effect.

The utility model provides a kind of sheet turnover mechanism, including inverting units and paper commutation portion, the inverting units Paper turning channel is formed between paper commutation portion；

The inverting units include fixation member and movable member, the fixed company of the shell of the fixation member and printing device It connects, the movable member is connected with driving part, and the driving part is for driving the movable member along the overturning channel Length direction far from or close to the fixation member, to adjust the length in the overturning channel.

Sheet turnover mechanism as described above, optionally, paper commutation portion include horizontal feed portion and arc conveying Portion, the arc delivery section are connected with the first end in the horizontal feed portion, and the second end in the horizontal feed portion enters for paper Mouthful.

Sheet turnover mechanism as described above, optionally, the movable member and fixation member clamping connect.

Sheet turnover mechanism as described above, optionally, first side of the movable member towards the fixation member Multiple latches are equipped with, the latch is vertically set in the first side of the movable member；The fixation member is towards institute The first side for stating movable member is equipped with multiple card slots compatible with the latch；The driving part can drive the card Tooth is moved along the card slot to change the length in the overturning channel.

Sheet turnover mechanism as described above, optionally, the maximum that the length of the latch is greater than the movable member can Moving distance.

Sheet turnover mechanism as described above is optionally additionally provided with sensor, the sensor in paper transportation path Positioned at the rear of the inverting units, the sensor is used to detect the length of paper；The control of the sensor and printing device Portion's communication connection processed.

Sheet turnover mechanism as described above, optionally, the driving part includes driving device and attachment device, described Attachment device is connected with the movable member, and the driving device can drive the attachment device mobile.

Sheet turnover mechanism as described above, optionally, the movable member are equipped with engaging portion, in the attachment device Equipped with fixed part compatible with the engaging portion, realized by the connection of the engaging portion and the fixed part described movable The fixation of component and the attachment device；Be additionally provided with portion to be driven in the attachment device, the portion to be driven be used for it is described Driving device is connected.

Sheet turnover mechanism as described above, optionally, the engaging portion are to be arranged in the movable member second side On protrusion, the fixed part is the groove being arranged in the attachment device first side；Alternatively, the engaging portion is setting Groove in the movable member second side, the fixed part be arranged in it is convex in the attachment device first side It rises.

Sheet turnover mechanism as described above, optionally, the driving device be driving motor, the driving motor it is defeated Outlet is connected with driving gear, and the portion to be driven is the rack gear being arranged in the attachment device second side, the driving Gear is engaged with the rack gear to drive the attachment device mobile.

Sheet turnover mechanism as described above, optionally, the driving device be driving motor, the driving motor it is defeated Outlet is connected with conveyer belt, and the portion to be driven is the conveyer belt fixed part being arranged in the attachment device second side, institute It states conveyer belt to be at least partially disposed in the conveyer belt fixed part, to realize that the conveyer belt is opposite with the attachment device It is fixed.

The utility model also provides a kind of printing device, including as above any sheet turnover mechanism.

Sheet turnover mechanism and printing device provided by the utility model, including inverting units and paper commutation portion, reversion Paper turning channel is formed between unit and paper commutation portion；Inverting units include fixation member and movable member, fixation member It is fixedly connected with the shell of printing device, movable member is connected with driving part, and driving part is for driving movable member edge to turn over Turn the length direction in channel far from or close to fixation member, to adjust the length in overturning channel.The paper of the utility model turns over Rotary device can adjust the length in paper turning channel, so that the length range that printer can be applicable in paper is wider, keep away Exempt from the generation of paper jam phenomenon；Adjustable overturning channel can also select suitable length, contracting according to the paper of different length The short paper turning time, and then improve printing effect.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts, It is also possible to obtain other drawings based on these drawings.

Fig. 1 is the structure diagram of printing device in the prior art；

Fig. 2 is the structure diagram for the printing device that an embodiment of the present invention provides；

Fig. 3 is the structure diagram for the sheet turnover mechanism that an embodiment of the present invention provides；

Fig. 4 is the structure diagram for the inverting units that an embodiment of the present invention provides；

Fig. 5 is the decomposition diagram of Fig. 3；

Fig. 6 is the decomposition texture schematic diagram for the attachment device that an embodiment of the present invention provides；

Fig. 7 is the decomposition texture schematic diagram for the attachment device that another embodiment of the utility model provides.

Appended drawing reference:

100- stack portion；110- paper pick-up roller；

The tail portion 200- diverter；300- inverting units；

310- reversible deflector；400- conveying roller；

500- sensor；600- printing portion；

610- record head；700- paper commutation portion；

800- distributing roller；900- pallet；

1000- inverting units；1100- fixation member；

1110- first side；1111- card slot；

1200- movable member；1210- first side；

1211- latch；1220- second side；

1221- protrusion；2000- driving part；

2100- attachment device；2110- first connecting portion；

2111- first side；2112- groove；

The tail portion 2113- diverter fixing groove；2114- shell fixing groove；

The first clamping portion 2115-；2116- protrusion；

The tail portion 2117- diverter protrusion；2118- case protrusion；

2120- second connecting portion；The second clamping portion 2121-；

2122- second side；2123- rack gear；

2124- conveyer belt fixed part；2200- drives gear；

2300- conveyer belt；The maximum movable distance of d- movable member；

The length of Q- latch.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.

Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.In the absence of conflict, following implementation Feature in example and embodiment can be combined with each other.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on the figure Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the dress of indication or suggestion meaning It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model Limitation.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be It is connected directly, the mutual of connection inside two elements or two elements can also be can be indirectly connected through an intermediary Interactively.For the ordinary skill in the art, it can understand that above-mentioned term is practical new at this as the case may be Concrete meaning in type.

It should be noted that term " first ", " second " are only used for facilitating description different in the description of the present invention, Component, be not understood to indicate or imply ordinal relation, relative importance or implicitly indicate indicated technical characteristic Quantity." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one of the features.

It is described below in conjunction with the detailed content to the utility model of attached drawing, so that those skilled in the art can The more detailed content for understanding the utility model.

Embodiment one

Fig. 2 is the structure diagram for the printing device that an embodiment of the present invention provides；Fig. 3 is the implementation of the utility model one The structure diagram for the sheet turnover mechanism that example provides；- Fig. 3 referring to figure 2..The present embodiment provides a kind of sheet turnover mechanism, packets Inverting units 1000 and paper commutation portion 700 are included, it is logical to form paper turning between inverting units 1000 and paper commutation portion 700 Road.

Inverting units 1000 include fixation member 1100 and movable member 1200, the shell of fixation member 1100 and printing device Body is fixedly connected, and movable member 1200 is connected with driving part 2000, and driving part 2000 is for driving 1200 edge of movable member The length direction in overturning channel is separate or close to fixation member 1100, to adjust the length in overturning channel.

Specifically, as shown in Fig. 2, knot similar with printing device in the prior art can be used in the printing device of the present embodiment Structure, only inverting units 300 in the prior art are replaced with the inverting units in the present embodiment by the printing device of the present embodiment 1000, in addition, the present embodiment also adds the driving part 2000 for driving the movable member 1200 in inverting units 1000 mobile.

Paper commutation portion 700 includes horizontal feed portion and arc delivery section, arc delivery section and the first of horizontal feed portion End is connected, and the second end in horizontal feed portion is paper inlet, and paper to be printed enters overturning by the second end in horizontal feed portion and leads to It is transported to the top of inverting units 1000 behind road, and then realizes that the table of paper carries on the back overturning；Inverting units 1000 in the present embodiment Including fixation member 1100 and movable member 1200, fixation member 1100 is fixedly connected with the shell of printing device, movable member 1200 are connected with driving part 2000, and driving part 2000 can drive movable member 1200 along the length direction or so in overturning channel It is mobile, so that movable member 1200 is mutually abutted or is separated with fixation member 1100, to change the length in overturning channel.

Specifically, when movable member 1200 is far from fixation member 1100, movable member 1200 and fixation member 1100 it Between distance become larger, and then make entirely overturn channel length increase, printing device plays longer paper Print；When movable member 1200 is mobile close to fixation member 1100, the distance between movable member 1200 and fixation member 1100 Become smaller, and then reduce the length for entirely overturning channel, the flip-flop transition of paper is shortened, to improve printing effect.

The present embodiment is additionally provided with sensor 500, and sensor position 500 is after inverting units 1000 in paper transportation path Side, sensor 500 are used to detect the length of paper；And the control unit communication connection of sensor 500 and printing device, it can will examine Even if the yardage measured is sent in printer control unit, printer control unit by according to the yardage that detects to drive Dynamic component 2000 issues control instruction, and then adjusts the distance between movable member 1200 and fixation member 1100.

With reference to the accompanying drawing 2 and attached drawing 3 the duplex printing process of the present embodiment is described in detail.

As shown in Fig. 2, the printing device of the present embodiment receives after the print command from computer paper pick-up roller 110 for heap Paper in folded portion 100 is sent into tail portion diverter 200, paper can turn an angle after tail portion diverter 200 and It is admitted to the top of inverting units 1000, the front end of inverting units 1000 is hingedly connected with reversible deflector 310, when paper is by changing When to baffle 310, due to the effect of paper self gravity, reversible deflector 310 is moved down, thus connection inverting units 1000 with Transfer passage between conveying roller 400 completes the conveying of paper；It is arranged between inverting units 1000 and conveying roller 400 simultaneously Sensor 500 record the length of paper, and be sent to control unit.Control unit control conveying roller 400 rotates forward, by paper It is delivered to printing portion 600, and controls record head 610 and is based on image information selectively from multiple outlets discharge ink on paper Image is formed, to complete the printout surface of paper.At this point, control unit controls driving portion according to the yardage information received Part 2000 is mobile, to drive movable member 1200 to be moved to suitable position, so that movable member 1200 and fixation member There is a certain distance between 1100；Meanwhile control unit control conveying roller 400 rotate backward, due to reversible deflector 310 again to Upper tilting, paper will be admitted in the paper commutation portion 700 of 1000 lower section of inverting units, and paper is entering paper commutation portion 700 When, the surface printed upward, turns an angle behind paper commutation portion 700, to make the table printed Facing towards lower section, and upward by the unprinted back side.Paper continuation is fed forward along inverting units 300, through reversible deflector 310 and conveying roller 400 after be sent in printing portion 600 again, complete the printing at the back side.Paper after the completion of printing is through distributing roller It is expelled to after 800 in pallet 900, to complete whole printing process.

If the length of paper is set as H, movable member 1200 overturns channel from print head length when nearest is L1, movably Component 1200 overturns channel from print head length when farthest is that L2 illustrates that the paper can be by the present embodiment then as L1 < H < L2 Printing device printed, at this point, movable member 1200 relative to fixation member 1100 moving distance D be (H-L1)/2； As H < L1, illustrates that the length of paper is less than the length in minimum overturning channel, the printing of the present embodiment still can be used at this time Equipment prints paper, and the overturning path that only paper passes through is greater than its required minimal path, and printing effect is lower； And as H > L2, illustrate that the length of paper is greater than the length in maximum overturning channel, if the printing device using the present embodiment carries out Printing, then the front-end and back-end of paper are pushed, therefore can control printer and the paper is forbidden to carry out duplex printing.

Sheet turnover mechanism provided in this embodiment, including inverting units 1000 and paper commutation portion 700, inverting units Paper turning channel is formed between 1000 and paper commutation portion 700.Inverting units 1000 include fixation member 1100 and movable part Part 1200, fixation member 1100 are fixedly connected with the shell of printing device, and movable member 1200 is connected with driving part 2000, are driven Dynamic component 2000 be used to driving movable member 1200 along overturning channel length direction far from or close to fixation member 1100, with The length in adjustment overturning channel.The sheet turnover mechanism of the present embodiment can adjust the length in paper turning channel, so that The length range that printer can be applicable in paper is wider, avoids the generation of paper jam phenomenon；Adjustable overturning channel can be with root Suitable length is selected according to the paper of different length, shortens the paper turning time, and then improve printing effect.

Fig. 4 is the structure diagram for the inverting units that an embodiment of the present invention provides；Fig. 5 is the decomposition diagram of Fig. 3； - Fig. 5 referring to figure 4..Further, in this embodiment movable member 1200 mutually can be clamped or separate with fixation member 1100. Specifically, movable member 1200 be equipped with the first guide portion, fixation member 1100 be equipped with the second guide portion, the first guide portion and Second guide portion can intersect engaging, so that the lower surface of movable member 1200 and fixation member 1100 collectively constitutes paper The guide surface opened.

Further, the first side 1210 of movable member 1200 towards fixation member 1100 is equipped with multiple latches 1211, latch 1211 is vertically set in the first side 1210 of movable member 1200；Fixation member 1100 is towards movable member 1200 first side 1110 is equipped with multiple card slots 1111 compatible with latch 1211, passes through the latch 1211 and card slot 1111 cooperation realizes that the clamping between movable member 1200 and fixation member 1100 connects.Driving part 2000 can drive latch 1211 move along card slot 1111 to change the length in overturning channel.

In the present embodiment, to guarantee to form continuous paper guide surface between movable member 1200 and fixation member 1100, It prevents paper from paper jam phenomenon occurs between movable member 1200 and fixation member 1100, the length Q of latch 1211 is arranged to Greater than the maximum movable distance d of movable member 1200, to guarantee that movable member 1200 and fixation member 1100 are constituted continuously Paper guide surface, not will form gap.

In the present embodiment, driving part 2000 includes driving device and attachment device 2100, attachment device 2100 and movable Component 1200 is connected, and it is mobile that driving device can be drivingly connected device 2100.

Specifically, movable member 1200 is equipped with engaging portion, attachment device 2100 is equipped with compatible with engaging portion solid Determine portion, the fixation of movable member 1200 Yu attachment device 2100 is realized by the connection of engaging portion and fixed part；Attachment device Portion to be driven is additionally provided on 2100, portion to be driven with driving device for being connected.

Fig. 6 is the decomposition texture schematic diagram for the attachment device that an embodiment of the present invention provides；- Fig. 6 referring to figure 3..This Attachment device 2100 is composed of first connecting portion 2110 and second connecting portion 2120 in embodiment, first connecting portion 2110 A side be equipped with the first clamping portion 2115, the first clamping portion 2115 can be arranged in it is convex in first connecting portion 2110 It rises, a side of second connecting portion 2120 is equipped with the second clamping portion 2121 for fastening with first connecting portion 2110, First connecting portion 2110 and second connecting portion 2120 is combined by the cooperation of the first clamping portion 2110 and the second clamping portion 2121 One.Fluted 2112 are formed after combination in 2100 first side 2111 of attachment device, groove 2112 is used for and movable member Protrusion 1221 match, the movement of limitation protrusion 1221, to drive movable member 1200 mobile.First side 2111 is also set There are tail portion diverter fixing groove 2113 and shell fixing groove 2114, the two is respectively used to connection tail portion diverter 200 and printing is set Standby shell.Connection first connecting portion is equipped in groove 2112, tail portion diverter fixing groove 2113 and shell fixing groove 2114 The guide groove of 2110 one sides can be distinguished movable member 1200, tail portion diverter 200 and printing device shell by guide groove It is fixed in groove 2112, tail portion diverter fixing groove 2113 and shell fixing groove 2114.

Driving device is chosen as driving motor, and the output end of driving motor is connected with driving gear 2200, and portion to be driven is Rack gear 2123 in 2100 second side 2122 of attachment device is set, and driving gear 2200 is engaged with rack gear 2123 with the company of driving Connection device 2100 is mobile.

Fig. 7 is the decomposition texture schematic diagram for the attachment device that another embodiment of the utility model provides；Please refer to Fig. 7.This reality Attachment device 2100 in mode is applied to be composed of first connecting portion 2110 and second connecting portion 2120, first connecting portion 2110 One side is equipped with the first clamping portion 2115, the first clamping portion 2115 can be arranged in it is convex in first connecting portion 2110 It rises, a side of second connecting portion 2120 is equipped with the second clamping portion 2121 for fastening with first connecting portion 2110, First connecting portion 2110 and second connecting portion 2120 is combined by the cooperation of the first clamping portion 2110 and the second clamping portion 2121 One.Protrusion 2116 is formed with after combination in 2100 first side 2111 of attachment device, protrusion 2116 is used for and movable member Groove match, to drive movable member 1200 mobile.First side 2111 is additionally provided with raised 2117 Hes of tail portion diverter Case protrusion 2118, the two are respectively used to connection tail portion diverter 200 and printing device shell.

Driving device is chosen as driving motor, and the output end of driving motor is connected with conveyer belt 2300, and portion to be driven is to set The conveyer belt fixed part 2124 in 2100 second side 2122 of attachment device is set, conveyer belt 2300 is at least partially disposed in transmission In band fixed part 2124, to realize the relatively fixed of conveyer belt 2300 and attachment device 2100.In the present embodiment, conveyer belt is fixed Portion 2124 have a card slot that conveyer belt 2300 can be blocked, conveyer belt 2300 pass through the card slot after with conveyer belt fixed part 2124 form one, to make attachment device 2100 mobile under the drive of driving motor, and then movable member 1200 are driven to move It is dynamic.

Embodiment two

The present embodiment provides a kind of printing devices, including sheet turnover mechanism described in embodiment one as above.

Printing device provided by the utility model, sheet turnover mechanism include inverting units and paper commutation portion, reversion Paper turning channel is formed between unit and paper commutation portion；Inverting units include fixation member and movable member, fixation member It is fixedly connected with the shell of printing device, movable member is connected with driving part, and driving part is for driving movable member edge to turn over Turn the length direction in channel far from or close to fixation member, to adjust the length in overturning channel.The paper of the utility model turns over Rotary device can adjust the length in paper turning channel, so that the length range that printer can be applicable in paper is wider, keep away Exempt from the generation of paper jam phenomenon；Adjustable overturning channel can also select suitable length, contracting according to the paper of different length The short paper turning time, and then improve printing effect.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (12)

1. a kind of sheet turnover mechanism, which is characterized in that including inverting units and paper commutation portion, inverting units and described Paper turning channel is formed between paper commutation portion；

The inverting units include fixation member and movable member, and the fixation member is fixedly connected with the shell of printing device, The movable member is connected with driving part, and the driving part is used for the length for driving the movable member along the overturning channel Degree direction is separate or close to the fixation member, to adjust the length in the overturning channel.

2. sheet turnover mechanism according to claim 1, which is characterized in that paper commutation portion includes horizontal feed portion With arc delivery section, the arc delivery section is connected with the first end in the horizontal feed portion, and the second of the horizontal feed portion End is paper inlet.

3. sheet turnover mechanism according to claim 1, which is characterized in that the movable member and the fixation member card It connects in succession.

4. sheet turnover mechanism according to claim 3, which is characterized in that the movable member is towards the fixation member First side be equipped with multiple latches, the latch is vertically set in the first side of the movable member；The fixation The first side of component towards the movable member is equipped with multiple card slots compatible with the latch；The driving part can The latch is driven to move along the card slot to change the length in the overturning channel.

5. sheet turnover mechanism according to claim 4, which is characterized in that the length of the latch is greater than the movable part The maximum movable distance of part.

6. sheet turnover mechanism according to claim 1, which is characterized in that sensor is additionally provided with, in paper transportation path The upper sensor is located at the rear of the inverting units, and the sensor is used to detect the length of paper；The sensor with The control unit communication connection of printing device.

7. any sheet turnover mechanism in -6 according to claim 1, which is characterized in that the driving part includes driving Device and attachment device, the attachment device are connected with the movable member, and the driving device can drive the attachment device It is mobile.

8. sheet turnover mechanism according to claim 7, which is characterized in that the movable member is equipped with engaging portion, institute Attachment device is stated equipped with fixed part compatible with the engaging portion, by the connection of the engaging portion and the fixed part with Realize the fixation of the movable member Yu the attachment device；Portion to be driven is additionally provided in the attachment device, it is described to be driven Portion with the driving device for being connected.

9. sheet turnover mechanism according to claim 8, which is characterized in that the engaging portion is to be arranged in the movable part Protrusion in part second side, the fixed part are the groove being arranged in the attachment device first side；Alternatively, the knot Conjunction portion is the groove being arranged in the movable member second side, and the fixed part is to be arranged in first side of attachment device Protrusion on face.

10. sheet turnover mechanism according to claim 9, which is characterized in that the driving device is driving motor, described The output end of driving motor is connected with driving gear, and the portion to be driven is the tooth being arranged in the attachment device second side Item, the driving gear are engaged with the rack gear to drive the attachment device mobile.

11. sheet turnover mechanism according to claim 9, which is characterized in that the driving device is driving motor, described The output end of driving motor is connected with conveyer belt, and the portion to be driven is the transmission being arranged in the attachment device second side Band fixed part, the conveyer belt is at least partially disposed in the conveyer belt fixed part, to realize the conveyer belt and the company Connection device it is relatively fixed.

12. a kind of printing device, which is characterized in that including the sheet turnover mechanism as described in any in claim 1-11.