CN114425917B

CN114425917B - Paper rubbing method of printer and printer

Info

Publication number: CN114425917B
Application number: CN202210194449.0A
Authority: CN
Inventors: 孙连晨; 王立成
Original assignee: Ningbo Deli Kebei Technology Co Ltd
Current assignee: Ningbo Deli Kebei Technology Co Ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2023-03-28
Anticipated expiration: 2042-03-01
Also published as: CN114425917A

Abstract

The invention relates to a paper twisting method of a printer, which is characterized in that when single-sided printing is carried out, a driving roller is controlled to rotate forwards to drive a paper twisting roller to rotate so as to realize the paper twisting action; when double-sided printing is carried out, the driving roller is controlled to rotate forwards to drive the pickup roller to rotate so as to realize pickup action when paper is fed; when paper is returned, the driving roller is controlled to rotate reversely to drive the supporting arm and the connecting arm to synchronously swing upwards, after the paper is returned, upward swinging drive of the supporting arm and the connecting arm is controlled to be released, so that the paper rubbing roller is in contact with the returned paper in the paper box, and then the driving roller is controlled to rotate forwards to drive the paper rubbing roller to rotate so as to achieve the paper rubbing action. The paper rubbing method of the printer can effectively eliminate the paper collision noise of the printer in single-sided printing work on the basis of ensuring double-sided printing. The invention also relates to a printer applying the paper twisting method of the printer.

Description

Paper rubbing method of printer and printer

Technical Field

The invention relates to the technical field of printers, in particular to a paper twisting method of a printer and the printer applying the paper twisting method.

Background

When the printer performs printing, the printer separates the uppermost paper sheet of the paper cassette, and then feeds the uppermost paper sheet into the printing path to perform image printing. For a printer capable of realizing double-sided printing, in order to avoid the influence of a pickup roller on paper return in the double-sided printing work, a supporting structure is usually used for realizing the upward supporting of the pickup roller, the pickup roller is driven to be pressed down on paper only when the paper needs to be picked up, the pickup of the paper is further realized, and the pickup roller is driven to leave the paper after the pickup action is finished.

For example, in chinese patent application No. CN1308204C (application No. 200410083343.5), composite paper supply unit, paper supply mechanism and image forming apparatus, a pickup roller in the disclosed paper supply mechanism is supported by a support plate in a raised manner, and as a motor drives an operation roller, the support plate rotates around a rotation shaft of the operation roller, so that the pickup roller abuts against the top surface of recording paper in a paper supply cassette. Further, the present invention relates to a paper feeding apparatus and an image forming apparatus in chinese utility model patent publication No. CN207301632U (application No. 201721143366. X), and a paper feeding apparatus and an image forming apparatus in chinese invention patent publication No. CN106904463B (application No. 201660390.9). In the paper twisting rollers in the schemes, the paper twisting rollers need to be driven to swing up and down no matter in single-side printing work or double-side printing work, and then paper twisting action is realized. In this way, in the paper feeding device of the duplex printer, the pickup roller is driven to swing up and down even when the single-sided printing operation is performed, and the duplex printing operation is satisfied at the same time. The vertical swing of the pickup roller inevitably generates larger collision noise when the pickup roller collides with paper, and the user experience is very poor particularly for single-side printing work with higher use frequency.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a paper twisting method for a printer, which can effectively eliminate the paper collision noise of the printer during single-sided printing operation on the basis of ensuring double-sided printing.

The second technical problem to be solved by the present invention is to provide a printer with low noise and better user experience in the single-sided printing process, aiming at the above prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the paper twisting method of the printer is characterized in that: the printer comprises a driving roller capable of rotating forwards and backwards, a connecting arm and a supporting arm, wherein the connecting arm and the supporting arm are respectively connected to the driving roller in an up-and-down swinging mode;

when single-side printing is carried out, the pickup roller is in a downward swinging state to enable the pickup roller to be in contact with paper in the paper box, the driving roller is controlled to rotate forwards to drive the pickup roller to rotate so as to realize pickup action;

when double-sided printing is carried out, the paper twisting roller is in a downward swinging state during paper feeding, so that the paper twisting roller is in contact with paper in the paper box, the driving roller is firstly controlled to rotate forwards, and the paper twisting roller is driven to rotate so as to realize paper twisting action; when paper is returned, the driving roller is controlled to rotate reversely to drive the supporting arm and the connecting arm to synchronously swing upwards, after the paper enters the paper box again through the paper returning path, upward swinging drive of the supporting arm and the connecting arm is controlled to be released, so that the paper rubbing roller is in contact with the returned paper in the paper box, and then the driving roller is controlled to rotate forwards to drive the paper rubbing roller to rotate to achieve paper rubbing action.

In order to avoid that the pressure of a connecting arm on paper is too high due to the driving force of the driving roller for swinging the supporting arm downwards, so that the probability of paper re-feeding during single-side printing is reduced, the connecting arm is linked with the supporting arm through a clutch mechanism;

when single-side printing is carried out, the clutch mechanism is controlled to be in a separated state, so that the connecting arm is separated from the supporting arm and is in a natural drooping state, the paper rubbing roller is contacted with paper in the paper box, the driving roller is controlled to rotate forwards, and the paper rubbing roller is driven to rotate to achieve a paper rubbing action;

when double-sided printing is carried out, the clutch mechanism is controlled to be in a separated state during paper feeding, so that the connecting arm is separated from the supporting arm and is in a natural drooping state, the paper rubbing roller is contacted with paper in the paper box, the driving roller is controlled to rotate forwards to drive the paper rubbing roller to rotate, and the paper rubbing action is realized; when paper is returned, the clutch mechanism is controlled to be in a combined state, so that the connecting arm is combined with the supporting arm, the driving roller is controlled to rotate reversely, the supporting arm is driven to swing upwards and simultaneously drive the connecting arm to swing upwards synchronously, after the paper enters the paper box again through the paper returning path, the clutch mechanism is controlled to be in a separated state, the connecting arm is separated from the supporting arm and is in a natural drooping state, the pickup roller is made to contact the paper in the paper box, and then the driving roller is controlled to rotate forwards, so that the pickup roller is driven to rotate to realize pickup action.

In order to avoid the influence of the pressing action of the supporting arm on the paper on the basis of ensuring the linkage reliability of the supporting arm on the connecting arm, the supporting arm is in transmission connection with the driving roller through the clutch mechanism;

only when double-sided printing is carried out and the connecting arm needs to be controlled to swing upwards, the clutch mechanism is controlled to be in a combined state, so that the supporting arm is combined with the driving roller for transmission, the connecting arm is combined with the supporting arm, and the driving roller is controlled to reversely rotate to drive the supporting arm to swing upwards and simultaneously drive the connecting arm to synchronously swing upwards;

in the process of carrying out single face printing work and carry out other course of working of two-sided printing, all control clutch and be in the separation state for linking arm and supporting arm are in the separation state, make the transmission relation of supporting arm and drive roller be in the separation state, and then make linking arm and supporting arm all be in the natural state of drooping, make the linking arm contact with the paper based on self gravity.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides a printer, includes the drive roller, establishes linking arm and supporting arm on the drive roller, rotates the pickup roller of connection on the linking arm, the pickup roller rotates transmission, its characterized in that through pickup drive assembly and drive roller: applying the paper rubbing method of the printer;

the supporting arm swings up and down along with the positive and negative rotation of the driving roller through the friction transmission of the supporting transmission assembly and the driving roller;

the clutch mechanism is used for realizing clutch connection between the connecting arm and the supporting arm.

In order to simplify the structure, the clutch mechanism is arranged on the supporting arm.

Preferably, the clutch mechanism comprises

A rod body which is arranged on the supporting arm in a penetrating way along the left and right direction in a sliding way;

the elastic piece is sleeved on the rod body and limited between the outer end of the rod body and the supporting arm, and the elastic piece has a tendency of pulling the rod body towards a direction far away from the connecting arm;

the metal plate is arranged on the rod body and positioned on the inner side of the supporting arm;

the electromagnetic assembly is electrically connected with the power supply and is arranged on one side close to the connecting arm relative to the metal plate, and the electromagnetic assembly generates magnetism after being electrified so as to attract the metal plate to move towards the connecting arm;

and the connecting arm is provided with a small hole for the rod body to move and penetrate.

The structure is simple, the supporting arm comprises a first arm plate and a second arm plate which are oppositely arranged and mutually connected, and the rod body penetrates through the first arm plate and the second arm plate along the left-right direction;

the electromagnetic assembly is arranged between the first arm plate and the second arm plate, and the electromagnetic assembly is sleeved on the rod body and is at least partially arranged in a limiting mode in the left-right direction.

In order to realize the clutch of the connecting arm and the supporting arm and realize the clutch of the driving roller and the supporting transmission assembly, the electromagnetic assembly comprises a first electromagnetic gear and a second electromagnetic gear which are electrified and attracted, and the first electromagnetic gear is positioned on one side far away from the connecting arm relative to the second electromagnetic gear;

the first electromagnetic gear is meshed with the driving roller, and the second electromagnetic gear is meshed with the supporting transmission assembly;

the first electromagnetic gear is sleeved on the rod body in a limiting rotation mode along the left-right direction, and the second electromagnetic gear is sleeved on the rod body in a sliding mode along the left-right direction.

In order to realize the stable direction of the moving direction of the rod body, a guide cylinder is arranged on the side surface of the first electromagnetic gear corresponding to the shape of the metal plate and extends towards the direction of the metal plate.

The structure is simple, the supporting arm comprises a first arm plate and a second arm plate which are oppositely arranged and mutually connected, and the supporting transmission assembly is arranged between the first arm plate and the second arm plate; the supporting transmission assembly comprises a supporting gear, a friction gasket, a friction piece and a spring pressing piece;

the installation axle is provided with along left right direction on the medial surface of first arm board, the supporting gear rotates the cover and establishes at the installation axle, the friction pad sets up on the supporting gear to the side of second arm board, the attached friction pad of friction piece and spacing at the installation epaxially, the suppress piece is located between second arm board and the friction piece and has the trend of suppress friction piece.

Compared with the prior art, the invention has the advantages that: according to the paper twisting method of the printer, when single-side printing is carried out, only the driving roller is controlled to rotate forwards, so that the connecting arm does not swing upwards any more, the sound that the connecting arm swings downwards to collide with paper is avoided in the single-side printing process, and the noise in the single-side printing process is reduced.

The printer can meet the requirements of single-sided printing work and double-sided printing work at the same time, and has low noise and better user experience in the single-sided printing work with higher use frequency.

Drawings

Fig. 1 is a perspective view of a printer in a paper feeding state according to an embodiment of the present invention.

Fig. 2 is a perspective view of the connecting arm and the supporting arm in a raised state according to the embodiment of the invention.

Fig. 3 is an exploded perspective view of a printer according to an embodiment of the present invention.

Fig. 4 is a sectional view of the clutch mechanism in the engaged state according to the embodiment of the present invention.

Fig. 5 is a sectional view of the clutch mechanism in a disengaged state according to the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

In order to realize a duplex printing operation, a conventional duplex printer generally includes a driving roller 1 capable of rotating in forward and reverse directions, a connecting arm 2 and a supporting arm 3 respectively connected to the driving roller 1 in an up-and-down swinging manner, wherein the supporting arm 3 is connected to the driving roller 1 in a transmission manner, so that when the driving roller 1 rotates in forward and reverse directions, the supporting arm 3 is correspondingly driven to swing in up and down directions, and the connecting arm 2 is linked with the supporting arm 3, so that the supporting arm 3 can drive the connecting arm 2 to swing in up and down directions. And a pickup roller 4 in transmission connection with the driving roller 1 is connected to the connecting arm 2 in a rotating manner, and the pickup roller 4 performs pickup action based on the rotation of the driving roller 1. Usually, the supporting arm 3 and the driving roller 1 are driven by a non-direct connection mode, so that the paper pickup roller 4 is ensured to normally perform a paper pickup action. Such as the support arm 3, may be driven by friction.

Based on this, the paper twisting method of the printer in this embodiment is: when single-side printing is carried out, the paper twisting roller 4 is in a downward swinging state, so that the paper twisting roller 4 is in contact with paper in the paper box 8, the driving roller 1 is controlled to rotate forwards, the paper twisting roller 4 is driven to rotate, and paper twisting action of a plurality of pieces of paper is continuously realized. When double-sided printing is carried out, the pickup roller 4 is in a downward swinging state during paper feeding, so that the pickup roller 4 is in contact with the paper in the paper box 8, the driving roller 1 is firstly controlled to rotate forwards, the pickup roller 4 is driven to rotate to realize pickup action, and the printing work of the content of the first side of the paper is realized; when paper is returned, the driving roller 1 is controlled to rotate reversely to drive the supporting arm 3 and the connecting arm 2 to synchronously swing upwards, after the paper enters the paper box 8 again through the paper returning path, the upward swinging drive of the supporting arm 3 and the connecting arm 2 is controlled to be released, so that the paper twisting roller 4 is in contact with the returned paper in the paper box 8, then the driving roller 1 is controlled to rotate forwards to drive the paper twisting roller 4 to rotate to realize the paper twisting action, and further the printing work of the content of the second surface of the paper is realized.

The method is suitable for various existing printer structures capable of performing double-sided printing, the swinging-up driving of the connecting arm 2 is not performed any more when single-sided printing is performed, and accordingly, the alternate action of swinging-up and swinging-down of the connecting arm 2 cannot occur when single-sided printing is performed, and accordingly, noise generated when the connecting arm 2 collides with paper cannot occur. When the double-sided printing is carried out, printing is carried out according to the double-sided printing method in the prior art, although the sound of paper collision can occur in the process, the frequency of the double-sided printing work is usually far lower than that of single-sided printing work, so that the tolerance degree of a user to noise based on the requirement of double-sided printing can be increased, and the influence on the experience of the user is small.

However, in the existing double-sided printer, the structure of the connecting arm 2 and the supporting arm 3 is always in a linkage state, and in order to realize the swinging-down action of the connecting arm 2, the supporting arm 3 needs to be driven to swing down by the driving roller 1, and then the connecting arm 2 is driven to swing down, so when the paper twisting method of the printer works, when the paper twisting wheel performs the paper twisting action, especially in the continuous paper twisting action process in the single-sided printing work, under the driving action of the driving roller 1, the swinging-down acting force of the supporting arm 3 and the connecting arm 2 is relatively large, so that the acting force of the paper twisting roller 4 acting on the paper is relatively large, and the problem of paper re-feeding is easy to occur. In this way, the link arm 2 in the present embodiment is linked to the support arm 3 by the clutch mechanism 7. The clutch mechanism 7 may be of various structures that can achieve clutch linkage between the connecting arm 2 and the support arm 3, and preferably, the clutch mechanism 7 that can achieve electrical control is used.

Thus, on the basis of the clutch mechanism 7, when single-side printing is carried out, the clutch mechanism 7 is controlled to be in a separated state, so that the connecting arm 2 is separated from the supporting arm 3 and is in a natural sagging state, the paper pickup wheel is naturally lapped on paper in the paper box 8 based on the self gravity action, the paper pickup roller 4 is contacted with the paper in the paper box 8, the driving roller 1 is controlled to rotate forwards, and the paper pickup roller 4 is driven to rotate so as to realize the paper pickup action;

when double-sided printing is carried out, the clutch mechanism 7 is controlled to be in a separated state during paper feeding, so that the connecting arm 2 is separated from the supporting arm 3 and is in a natural drooping state, the pickup roller 4 is contacted with paper in the paper box 8, the driving roller 1 is controlled to rotate forwards, and the pickup roller 4 is driven to rotate so as to realize pickup action; when paper is returned, the clutch mechanism 7 is controlled to be in a combined state, the connecting arm 2 is combined with the supporting arm 3, the driving roller 1 is controlled to rotate reversely, the supporting arm 3 is driven to swing upwards and simultaneously drive the connecting arm 2 to swing upwards synchronously, after the paper enters the paper box 8 again through a paper returning path, the clutch mechanism 7 is controlled to be in a separated state, the connecting arm 2 is separated from the supporting arm 3 and is in a natural sagging state, the pickup roller 4 is made to be in contact with the paper in the paper box 8, and then the driving roller 1 is controlled to rotate forwards and drive the pickup roller 4 to rotate so as to achieve pickup action.

According to the method, the connecting arm 2 and the supporting arm 3 are combined and separated through the clutch mechanism 7, when paper is required to be rubbed, the connecting arm 2 and the supporting arm 3 are separated, the connecting arm 2 is guaranteed to be put on paper by means of self gravity to perform the paper rubbing action, the pressure on the paper is reduced, and the probability of paper re-feeding is correspondingly reduced. When the connecting arm 2 needs to swing upwards, the connecting arm is combined with the supporting arm 3 through the clutch mechanism 7, synchronous upward swinging of the connecting arm 2 and the supporting arm 3 is realized through reverse driving of the driving roller 1, the requirement that paper returns to the paper box 8 is met, and then paper twisting action is carried out to realize printing of the content of the second surface of the paper. This method is suitable for a configuration in which the support arm 3 does not press the paper in the sheet cassette 8 or the support arm 3 presses the paper in the sheet cassette 8 less by the driving of the driving roller 1.

However, since the pickup roller has a certain weight, in order to ensure effective linkage of the support arm 3 to the connecting arm 2, especially reliable linkage of the support arm 3 to the connecting arm 2 under the action of the clutch mechanism 7, the support arm 3 is usually configured as an arm structure having a length corresponding to the length of the connecting arm 2. In order to sufficiently reduce the pressure on the paper sheet in the state where the support arm 3 is swung down without affecting the effective and reliable linkage of the link arm 2, the support arm 3 is also drivingly connected to the drive roller 1 by the clutch mechanism 7.

Therefore, only when the double-sided printing work is carried out and the connecting arm 2 needs to be controlled to swing upwards, the clutch mechanism 7 is controlled to be in a combined state, the supporting arm 3 is combined with the driving roller 1 for transmission, the connecting arm 2 is combined with the supporting arm 3, and the driving roller 1 is controlled to reversely drive the supporting arm 3 to swing upwards and simultaneously drive the connecting arm 2 to swing upwards synchronously.

In the process of single-side printing and other processes of double-side printing, the clutch mechanism 7 is controlled to be in a separated state, the connecting arm 2 and the supporting arm 3 are in a separated state, the transmission relation between the supporting arm 3 and the driving roller 1 is in a separated state, the connecting arm 2 and the supporting arm 3 are in a natural sagging state, and the connecting arm 2 is in contact with paper based on the gravity of the connecting arm 2. Since the connecting arm 2 and the supporting arm 3 are both in a state of hanging naturally and hanging on the paper, the pressure on the paper is small, and the problem of paper re-feeding caused by excessive pressure on the paper is greatly reduced.

As shown in fig. 1 to fig. 5, the printer in this embodiment can work by using the paper feeding method of the printer. The printer specifically comprises a driving roller 1, a pickup roller 4, a connecting arm 2, a supporting arm 3, a pickup transmission assembly 5, a supporting transmission assembly 6 and a clutch mechanism 7.

Wherein the drive roller 1 in this implementation extends along the left and right direction of printer and sets up, and the one end of this drive roller 1 is connected with the actuating mechanism in the printer, and then can carry out positive and negative rotation action under actuating mechanism's drive.

Linking arm 2, supporting arm 3's one end is established respectively and is established on drive roller 1 and can carry out the luffing motion for drive roller 1, and in order to realize the separation and reunion action between following linking arm 2, the supporting arm 3, linking arm 2 and supporting arm 3 can paste the setting each other tightly, and supporting arm 3 is located one side of linking arm 2 promptly. In order to ensure the strength of the connecting arm 2 and the supporting arm 3 and facilitate the installation of the components of the pickup roller 4, the pickup driving assembly 5, the supporting driving assembly 6 and the clutch mechanism 7, the connecting arm 2 in the embodiment includes a third arm plate 22 and a fourth arm plate 23 which are oppositely arranged and connected with each other, so that an installation space is formed between the third arm plate 22 and the fourth arm plate 23. The support arm 3 includes a first arm plate 31 and a second arm plate 32 which are oppositely arranged and connected with each other, so that an installation space is formed between the first arm plate 31 and the second arm plate 32.

The pickup roller 4 penetrates through the other end of the connecting arm 2 in the left-right direction and is axially limited, namely, the pickup roller 4 penetrates through the third arm plate 22 and the fourth arm plate 23 respectively, two ends of the pickup roller 4 extend to the outer sides of the third arm plate 22 and the fourth arm plate 23 respectively, and the pickup roller 4 is provided with a limiting structure at the connecting position of the third arm plate 22 and the fourth arm plate 23 so as to realize axial limitation of the pickup roller 4 relative to the connecting arm 2.

Two ends of the pickup roller 4 are respectively provided with pickup wheels 41 for performing pickup action. The pickup roller 4 is in rotation transmission with the driving roller 1 through a pickup transmission assembly 5, and the pickup transmission assembly 5 is arranged in an installation space between the third arm plate 22 and the fourth arm plate 23. In order to realize transmission conveniently, a first driving gear 11 is arranged on the driving roller 1 at a position corresponding to the paper twisting transmission assembly 5, a driven gear 42 is arranged on the paper twisting roller 4 at a position corresponding to the paper twisting transmission assembly 5, the paper twisting transmission assembly 5 comprises a plurality of mutually meshed driving gears which are in transmission connection between the driving roller 1 and the paper twisting roller 4, shafts for mounting the driving gears can be connected between the third arm plate 22 and the fourth arm plate 23, so that the driving gears are mutually meshed with the first driving gear 11 on the driving roller 1 and the driven gear 42 on the paper twisting roller 4 respectively, when the driving mechanism drives the driving roller 1 to rotate, the paper twisting roller 4 is driven to rotate through the paper twisting transmission assembly 5, and then the paper twisting action is realized.

The support arm 3 is frictionally driven by the support transmission assembly 6 to the drive roller 1, and swings up and down in accordance with the forward and reverse rotations of the drive roller 1. Specifically, the support transmission assembly 6 is disposed between the first arm plate 31 and the second arm plate 32. The supporting transmission assembly 6 comprises a supporting gear 61, a friction pad 62, a friction member 63 and a spring pressing member 64. Wherein, the inner side surface of the first arm plate 31 is provided with a mounting shaft 311 along the left-right direction, the length of the mounting shaft 311 is smaller than the distance between the first arm plate 31 and the second arm plate 32, the supporting gear 61 is rotatably sleeved on the mounting shaft 311, the friction gasket 62 is arranged on the side surface of the supporting gear 61 facing the second arm plate 32, the friction piece 63 is attached to the friction gasket 62 and limited on the mounting shaft 311, and the elastic pressing piece 64 is arranged between the second arm plate 32 and the friction piece 63 and has the tendency of elastic pressing the friction piece 63. In order to satisfy the relative rotation of the supporting gear 61 on the mounting shaft 311 and the rotation limitation of the friction member 63, the section of the mounting shaft 311 corresponding to the portion where the supporting gear 61 is sleeved is circular, and the section of the mounting shaft 311 corresponding to the portion where the friction member 63 is sleeved has a straight line segment. The support gear 61 can be driven by the driving roller 1 to swing up and down with the forward and reverse rotation of the driving roller 1. Specifically, after the supporting gear 61 is driven to rotate, the friction pad 62 rotates along with the supporting gear 61, and the entire supporting arm 3 is driven to swing up and down by the friction force between the friction piece 63 and the friction pad 62 under the urging action of the urging piece 64 on the friction piece 63.

The clutch mechanism 7 in this embodiment is used for realizing clutch connection between the connecting arm 2 and the supporting arm 3, and the clutch mechanism 7 is applied to the paper twisting method, so that when single-sided printing is performed, the connecting arm 2 and the supporting arm 3 are in a separated state, the connecting arm 2 can be put on paper under the action of self gravity, and then continuous paper twisting action is realized, thus noise of paper collision of the twisting roller 4 caused by upward and downward swinging of the connecting arm 2 is effectively avoided in the single-sided printing. In the double-sided printing work, the connecting arm 2 and the supporting arm 3 are combined through the clutch mechanism 7, and then the supporting arm 3 is driven to swing up and down under the action of the driving roller 1, so that the normal operation of the double-sided printing work is ensured.

The clutch mechanism 7 in the present embodiment is provided on the support arm 3. The clutch mechanism 7 includes a rod 71, an elastic member 72, a metal plate 73, and an electromagnetic assembly 74. The rod 71 is slidably inserted through the support arm 3 in the left-right direction, and specifically, the rod 71 passes through the first arm plate 31 and the second arm plate 32 in the left-right direction. The elastic member 72 is sleeved on the rod body 71 and limited between the outer end of the rod body 71 and the support arm 3, and the elastic member 72 has a tendency of pulling the rod body 71 in a direction away from the connecting arm 2. The metal plate 73 is provided on the rod body 71 and inside the support arm 3. The electromagnetic assembly 74 is electrically connected to a power source and disposed on a side close to the connecting arm 2 relative to the metal plate 73, and after being energized, the electromagnetic assembly 74 generates magnetism to attract the metal plate 73 to move toward the connecting arm 2. The connecting arm 2 is provided with a small hole 21 for the rod body 71 to move and penetrate, when the rod body 71 penetrates into the small hole 21, the supporting arm 3 is combined with the connecting arm 2, and when the rod body 71 is separated from the small hole 21, the supporting arm 3 is separated from the connecting arm 2.

The electromagnetic component 74 can be fixed on the supporting arm 3 corresponding to the position of the metal plate 73, so that the electromagnetic component 74 can attract the metal plate 73 to move towards the connecting arm 2 when being electrified, so that the rod body 71 overcomes the elastic force of the elastic component 72 and penetrates into the small hole 21 on the connecting arm 2, and the combination of the supporting arm 3 and the connecting arm 2 is realized. When the electromagnetic assembly 74 is de-energized, the magnetic attraction force on the metal plate 73 is released, and the rod body 71 is disengaged from the small hole 21 on the connecting arm 2 under the action of the elastic member 72, so that the supporting arm 3 is separated from the connecting arm 2.

In order to reduce the installation space and avoid the influence on other devices, in this embodiment, the electromagnetic assembly 74 is sleeved on the rod body 71 and at least partially disposed in a left-right direction, and the limiting structure may be a structure capable of limiting the left-right direction, such as a limiting groove or a limiting stop bar disposed on the support arm 3 for the electromagnetic assembly 74 to be inserted into.

In the present embodiment, in order to further reduce the number of components, the electromagnetic assembly 74 is provided as a component that can perform a transmission function, and the electromagnetic assembly 74 is provided as a component that can perform not only the engagement and disengagement of the connecting arm 2 and the support arm 3 but also the engagement and disengagement of the drive roller 1 and the support transmission assembly 6.

Specifically, the electromagnetic assembly 74 includes a first electromagnetic gear 741 and a second electromagnetic gear 742 which are electrically engaged, and the first electromagnetic gear 741 is located on a side away from the connecting arm 2 with respect to the second electromagnetic gear 742. The first electromagnetic gear 741 meshes with the drive roller 1, and specifically, the drive roller 1 is provided with a second drive gear 12 meshing with the first electromagnetic gear 741. The second electromagnetic gear 742 is meshed with the support transmission assembly 6, and specifically, the second electromagnetic gear 742 is meshed with the support gear 61 in the support transmission assembly 6. The first electromagnetic gear 741 is rotatably sleeved on the rod 71 in a left-right direction, and the specific limiting structure may be various structures capable of achieving axial limiting, for example, a limiting groove or a limiting stop lever for the first electromagnetic gear 741 to be inserted may be disposed on the supporting arm 3. In order to stably guide the movement direction of the rod 71, a guide tube 7411 is provided on the side surface of the first electromagnetic gear 741 so as to extend in the direction of the metal plate 73 in accordance with the shape of the metal plate 73. The second solenoid gear 742 is slidably fitted over the lever 71 in the left-right direction.

In the present embodiment, the electromagnetic assembly 74 is controlled to be energized and the drive roller 1 is controlled to be reversed only when the link arm 2 is lifted up in the duplex printing operation. When the electromagnetic assembly 74 is energized, the first electromagnetic gear 741 attracts the metal plate 73 to move and drives the rod 71 to penetrate into the connecting arm 2, so as to combine the connecting arm 2 with the supporting arm 3. Meanwhile, the first electromagnetic gear 741 and the second electromagnetic gear 742 are attracted to each other and can rotate synchronously, so that the driving roller 1 and the supporting transmission assembly 6 are driven to transmit, the driving roller 1 rotates reversely to drive the first electromagnetic gear 741 and the second electromagnetic gear 742 to rotate synchronously, the supporting transmission assembly 6 is driven to transmit, and the supporting arm 3 is lifted upwards. And due to the combination of the connecting arm 2 and the supporting arm 3, the connecting arm 2 is also lifted, and the paper rubbing roller 4 is far away from the paper below, so that the paper returning to the paper box 8 is not influenced.

When the paper twisting action is needed, the electromagnetic assembly 74 is controlled to be powered off, and meanwhile, the driving roller 1 is controlled to rotate forwards. After the electromagnetic assembly 74 is de-energized, the first electromagnetic gear 741 releases the attraction force to the metal plate 73 and the attraction force to the second electromagnetic gear 742. The rod 71 is thus returned to its position away from the arm 2 by the resilient member 72, and the arm 2 is separated from the arm 3. Meanwhile, the first electromagnetic gear 741 and the second electromagnetic gear 742 are not mutually attracted and relatively independent, the rotation of the driving roller 1 can only drive the first electromagnetic gear 741 to rotate but cannot drive the second electromagnetic gear 742 to rotate, namely, the driving of the driving roller 1 and the supporting transmission assembly 6 fails, and the driving of the driving roller 1 to the supporting arm 3 cannot be realized, so that the connecting arm 2 and the supporting arm 3 are naturally lapped on the paper below under the action of self gravity, the rubbing roller 4-degree paper has no extra downward pressure, the friction of the rubbing roller 4 to the paper is more appropriate, the rotation of the driving roller 1 during the forward rotation only drives the rubbing roller 4 to rotate so as to rub the paper, and the condition of rubbing multiple pieces of paper is not easy to occur in the process.

The printer provided by the invention utilizes the paper twisting method, so that the noise is low and the user experience is better in single-sided printing work with higher use frequency.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the invention, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims

1. A paper twisting method of a printer is characterized in that: the printer comprises a driving roller (1) capable of rotating forwards and reversely, a connecting arm (2) and a supporting arm (3), wherein the connecting arm (2) and the supporting arm (3) are respectively connected to the driving roller (1) in a vertically swinging mode, the supporting arm (3) is connected with the driving roller (1) in a transmission mode, a paper twisting roller (4) connected with the driving roller (1) in a transmission mode is connected to the connecting arm (2) in a rotating mode, and the connecting arm (2) is linked with the supporting arm (3);

when single-side printing is carried out, the paper pickup roller (4) is in a downward swinging state, so that the paper pickup roller (4) is in contact with paper in the paper box (8), the driving roller (1) is controlled to rotate forward, and the paper pickup roller (4) is driven to rotate to realize paper pickup action;

when double-sided printing is carried out, during paper feeding, the paper pickup roller (4) is in a downward swinging state, so that the paper pickup roller (4) is in contact with paper in the paper box (8), the driving roller (1) is controlled to rotate forwards, and the paper pickup roller (4) is driven to rotate to realize paper pickup action; when paper is returned, the driving roller (1) is controlled to rotate reversely to drive the supporting arm (3) and the connecting arm (2) to synchronously swing upwards, after the paper enters the paper box (8) again through the paper returning path, the upward swinging drive of the supporting arm (3) and the connecting arm (2) is controlled and released, so that the pickup roller (4) is in contact with the returned paper in the paper box (8), and then the driving roller (1) is controlled to rotate forwards to drive the pickup roller (4) to rotate to realize the pickup action;

the connecting arm (2) is linked with the supporting arm (3) through a clutch mechanism (7);

when single-side printing is carried out, the clutch mechanism (7) is controlled to be in a separated state, the connecting arm (2) is separated from the supporting arm (3) and is in a natural drooping state, the pickup roller (4) is contacted with paper in the paper box (8), the driving roller (1) is controlled to rotate forward, and the pickup roller (4) is driven to rotate to realize pickup action;

when double-sided printing is carried out, the clutch mechanism (7) is controlled to be in a separated state during paper feeding, so that the connecting arm (2) is separated from the supporting arm (3) and is in a natural drooping state, the pickup roller (4) is contacted with paper in the paper box (8), the driving roller (1) is controlled to rotate forwards to drive the pickup roller (4) to rotate so as to realize pickup action; when paper is returned, the clutch mechanism (7) is controlled to be in a combined state, the connecting arm (2) is combined with the supporting arm (3), the driving roller (1) is controlled to rotate reversely, the supporting arm (3) is driven to swing upwards and simultaneously drive the connecting arm (2) to swing upwards synchronously, after paper enters the paper box (8) again through a paper returning path, the clutch mechanism (7) is controlled to be in a separated state, the connecting arm (2) is separated from the supporting arm (3) to be in a natural sagging state, the pickup roller (4) is made to be in contact with the paper in the paper box (8), and then the driving roller (1) is controlled to rotate forwards to drive the pickup roller (4) to rotate so as to achieve pickup action.

2. The pickup method of a printer according to claim 1, wherein: the supporting arm (3) is in transmission connection with the driving roller (1) through the clutch mechanism (7);

only when double-sided printing work is carried out and the connecting arm (2) needs to be controlled to swing upwards, the clutch mechanism (7) is controlled to be in a combined state, the supporting arm (3) is combined with the driving roller (1) for transmission, the connecting arm (2) is combined with the supporting arm (3), and the driving roller (1) is controlled to reversely drive the supporting arm (3) to swing upwards and simultaneously drive the connecting arm (2) to swing upwards synchronously;

in the process of single-side printing and other working processes of double-side printing, the clutch mechanisms (7) are controlled to be in a separated state, the connecting arm (2) and the supporting arm (3) are in a separated state, the transmission relation between the supporting arm (3) and the driving roller (1) is in a separated state, and then the connecting arm (2) and the supporting arm (3) are in a natural sagging state, so that the connecting arm (2) is in contact with paper based on the gravity of the connecting arm (2).

3. The utility model provides a printer, includes drive roller (1), overlaps establishes linking arm (2) and supporting arm (3) on drive roller (1), rotates pickup roller (4) of connection on linking arm (2), pickup roller (4) rotate the transmission through pickup drive assembly (5) and drive roller (1), its characterized in that: a paper pickup method using the printer according to claim 1;

the supporting arm (3) is in friction transmission with the driving roller (1) through a supporting transmission component (6) and swings up and down along with the positive and negative rotation of the driving roller (1); the device also comprises a clutch mechanism (7) for realizing clutch connection between the connecting arm (2) and the supporting arm (3).

4. A printer according to claim 3, wherein: the clutch mechanism (7) is arranged on the supporting arm (3).

5. The printer according to claim 4, wherein: the clutch mechanism (7) comprises

A rod body (71) which is arranged on the supporting arm (3) in a penetrating way along the left-right direction in a sliding way;

the elastic piece (72) is sleeved on the rod body (71) and limited between the outer end of the rod body (71) and the supporting arm (3), and the elastic piece (72) has a tendency of pulling the rod body (71) towards a direction far away from the connecting arm (2);

a metal plate (73) which is provided on the rod body (71) and is positioned inside the support arm (3);

the electromagnetic assembly (74) is electrically connected with the power supply and is arranged on one side close to the connecting arm (2) relative to the metal plate (73), and the electromagnetic assembly (74) generates magnetism after being electrified so as to attract the metal plate (73) to move towards the connecting arm (2);

and a small hole (21) for the rod body (71) to move and penetrate is formed in the connecting arm (2).

6. The printer according to claim 5, wherein: the supporting arm (3) comprises a first arm plate (31) and a second arm plate (32) which are oppositely arranged and mutually connected, and the rod body (71) penetrates through the first arm plate (31) and the second arm plate (32) along the left-right direction;

the electromagnetic assembly (74) is arranged between the first arm plate (31) and the second arm plate (32), and the electromagnetic assembly (74) is sleeved on the rod body (71) and is at least partially arranged in a limiting mode in the left-right direction.

7. The printer of claim 6, wherein: the electromagnetic assembly (74) comprises a first electromagnetic gear (741) and a second electromagnetic gear (742) which are powered on and closed, and the first electromagnetic gear (741) is positioned on one side far away from the connecting arm (2) relative to the second electromagnetic gear (742);

the first electromagnetic gear (741) is meshed with the driving roller (1), and the second electromagnetic gear (742) is meshed with the supporting transmission assembly (6);

the first electromagnetic gear (741) is sleeved on the rod body (71) in a limiting and rotating manner along the left-right direction, and the second electromagnetic gear (742) is sleeved on the rod body (71) in a sliding manner along the left-right direction.

8. The printer according to claim 7, wherein: a guide tube (7411) is provided on the side surface of the first electromagnetic gear (741) so as to extend in the direction of the metal plate (73) in accordance with the shape of the metal plate (73).

9. A printer according to claim 3, wherein: the supporting arm (3) comprises a first arm plate (31) and a second arm plate (32) which are oppositely arranged and mutually connected, and the supporting transmission assembly (6) is arranged between the first arm plate (31) and the second arm plate (32); the supporting transmission assembly (6) comprises a supporting gear (61), a friction gasket (62), a friction piece (63) and a pressing piece (64);

the installation axle (311) is arranged on the inner side surface of the first arm plate (31) along the left-right direction, the supporting gear (61) is rotatably sleeved on the installation axle (311), the friction gasket (62) is arranged on the side surface, facing the second arm plate (32), of the supporting gear (61), the friction piece (63) is attached to the friction gasket (62) and limited on the installation axle (311), and the elastic pressing piece (64) is arranged between the second arm plate (32) and the friction piece (63) and has a tendency of elastically pressing the friction piece (63).