CN220947251U - Auxiliary paper pressing device and printer - Google Patents

Abstract

The utility model discloses an auxiliary paper pressing device and a printer. The auxiliary paper pressing device comprises a frame body, an elastic piece and a pressing roller. The frame body is fixedly connected to the frame, at least one accommodating cavity is arranged along the direction of the rotation axis, and at least one first hole is formed in the accommodating cavity towards the printing roller; a pressing roller, at least one of which is arranged in the accommodating cavity, wherein a part of the pressing roller is suitable for being exposed from the first hole to press the printing medium, so that the printing medium is attached to the printing roller; the elastic piece corresponds to the pressing roller and is arranged between the frame body and the pressing roller so as to apply pressure towards the printing roller to the pressing roller, and the pressing roller has freedom degree at least in the direction towards the printing roller and the direction away from the printing roller when being accommodated in the accommodating cavity.

Description

Auxiliary paper pressing device and printer

Technical Field

The utility model relates to the field of printing equipment, in particular to an auxiliary paper pressing device and a printer.

Background

In the prior art, in order to enable the printing medium to be protruded and wrinkled, the printing effect is finally affected, an auxiliary paper pressing roller is generally arranged, when the printing medium passes through, friction force is generated between the printing medium and the auxiliary paper pressing roller, so that the auxiliary paper pressing roller is driven to rotate, and meanwhile the auxiliary paper pressing roller presses the printing medium to smooth the printing medium. The auxiliary paper pressing roller extends along the width direction of the printing medium, a shaft hole is arranged on the rack, a shaft lever is arranged on the auxiliary paper pressing roller, and the shaft lever is matched with the shaft hole in size so as to be spliced with the shaft hole; however, due to assembly or processing errors (such as different heights of shaft holes at two ends of the frame), the auxiliary platen roller may be off-axis after being mounted on the frame, so that in the width direction of the printing medium, one end of the auxiliary platen roller contacts with the printing medium, while the other end forms a space with the printing medium, the auxiliary platen roller cannot be integrally attached to the printing medium, and a part of the area of the printing medium still protrudes, so that the final printing effect is poor.

Disclosure of utility model

The present utility model is directed to overcoming the above-mentioned drawbacks or problems in the prior art, and providing an auxiliary paper pressing device and a printer.

To achieve the above object, the present utility model and its preferred embodiments adopt the following technical solutions but the embodiments are not limited to the following solutions:

The first scheme, an auxiliary paper pressing device for support the printing medium, make printing medium laminating printing roller, the rotation of frame revolute axis of rotation is relative to the printing roller, include:

The frame body is fixedly connected to the frame, at least one accommodating cavity is arranged along the rotation axis direction, and at least one first hole is formed in the accommodating cavity towards the printing roller;

A pressing roller, at least one of which is arranged in the accommodating cavity, wherein a part of the pressing roller is suitable for being exposed from the first hole to press the printing medium, so that the printing medium is attached to the printing roller; the pressing roller has a degree of freedom at least in a direction toward the printing roller and a direction away from the printing roller when the pressing roller is accommodated in the accommodation chamber; and

And the elastic piece is arranged corresponding to the pressing roller and is arranged between the frame body and the pressing roller so as to apply pressure to the pressing roller towards the printing roller.

Based on the first scheme, the number of the pressing rollers is equal to and corresponds to the containing cavities one by one, and the number of the elastic pieces is equal to and corresponds to the number of the pressing rollers one by one.

According to the third scheme, based on the first scheme, a limiting surface deviating from the printing roller is arranged in the accommodating cavity, each pressing roller is provided with a roller body and two roller shafts, and the roller bodies are suitable for exposing the accommodating cavity from the first holes; the roll shaft or the roll body is suitable for being limited by the limiting surface so as to prevent the pressing roll from being separated from the accommodating cavity.

According to a fourth scheme, based on the third scheme, the accommodating cavity is provided with two rotating grooves, and the bottom of each rotating groove forms the limiting surface; the two roll shafts are respectively matched with the two rotary grooves in a rotary way and are suitable for being limited by the limiting surfaces; and the size of the rotary groove is larger than that of the roller shaft at least in the direction towards the printing roller.

According to the fifth scheme, based on the fourth scheme, the cross section of each rotary groove perpendicular to the direction of the rotation axis is U-shaped, and the shaft diameter of the roll shaft is the same as the groove diameter of the rotary groove.

The elastic piece is a torsion spring, and the torsion spring is arranged on the frame body and comprises a first elastic end and a second elastic end, wherein the first elastic end is abutted against the frame body, and the second elastic end is abutted against the abutting roller and is in linear contact with the abutting roller; the pressing roller is provided with an annular groove, the annular groove is arranged on the pressing roller, and the second elastic end is arranged in the annular groove.

According to the seventh scheme, based on the sixth scheme, the pressing roller is provided with two pressing portions, the two pressing portions are symmetrically arranged on two sides of the annular groove along the rotation axis direction, and the two pressing portions are both suitable for being exposed from the first hole to press the printing medium.

According to an eighth aspect, based on the first aspect, each pressing roller corresponds to at least two elastic members, and each elastic member is arranged along the rotation axis direction, and applies pressure towards the printing roller to at least two ends of the pressing roller along the rotation axis direction.

A ninth aspect is a printer comprising a printing roller, a frame, and an auxiliary platen as set forth in any one of the first to seventh aspects or an auxiliary platen as set forth in the eighth aspect, the printing roller rotating about a rotation axis with respect to the frame.

According to the tenth scheme, based on the ninth scheme, the printing device further comprises a plurality of printing pieces, each printing piece is arranged around the printing roller, an auxiliary paper pressing device is arranged between two adjacent printing pieces, and each auxiliary paper pressing device is arranged around the printing roller.

As can be seen from the above description of the present utility model and the preferred embodiments thereof, compared with the prior art, the technical solution of the present utility model and the preferred embodiments thereof have the following beneficial effects due to the following technical means:

1. in a first aspect and a preferred embodiment thereof, an auxiliary paper pressing device is configured to press a printing medium against a printing roller, where the printing roller rotates about a rotation axis relative to a frame, and includes a frame body, an elastic member, and a pressing roller.

The frame body is fixedly connected with the frame, so that the frame body is installed;

The frame body is provided with at least one accommodating cavity along the direction of the rotation axis, and the accommodating cavity is provided with at least one first hole towards the printing roller; at least one accommodating cavity is internally provided with a pressing roller, and part of the pressing roller is suitable for being exposed from the first hole to press the printing medium, so that the printing medium is attached to the printing roller, and the printing medium is prevented from being protruded and wrinkled to influence the printing effect;

the elastic piece corresponds to the pressing roller and is arranged between the frame body and the pressing roller so as to apply pressure towards the printing roller to the pressing roller, the pressing roller has freedom degree at least in the direction towards the printing roller and the direction away from the printing roller when being accommodated in the accommodating cavity, and under the action of the elastic piece, the pressing roller moves towards the direction of the printing roller until the pressing roller enables the printing medium to be attached to the printing roller, so that the attaching of the printing medium is guaranteed, and the paper feeding is enabled not to deviate.

2. In the second scheme and the preferred embodiment thereof, the number of the pressing rollers is equal to and corresponds to the containing cavity one by one, the number of the elastic pieces is the same as and corresponds to the number of the pressing rollers one by one, when the number of the pressing rollers is one, the structure is simpler, when the number of the pressing rollers is multiple, the printing medium can be pressed by each pressing roller in a self-adaptive mode due to independent bias voltage, and therefore the printing roller can be pressed by the printing medium along the width direction of the printing medium, so that the stress of the printing medium is uniform, and the paper feeding is not deviated.

3. In the third scheme and the preferred embodiment thereof, a limiting surface deviating from the printing roller is arranged in the accommodating cavity, each pressing roller is provided with a roller body and two roller shafts, and the roller bodies are suitable for exposing the accommodating cavity from the first holes; the roller or the roller body is suitable for being limited by the limiting surface so as to prevent the pressing roller from separating from the accommodating cavity, and therefore, through the arrangement of the limiting surface, the printing roller can be firstly arranged in the accommodating cavity and is installed on the rack together with the bracket, the pressing roller does not need to fall out from the first hole due to gravity in the installation process, and the assembly is convenient.

4. In the fourth scheme and the preferred embodiment thereof, the accommodating cavity is provided with two rotating grooves, and the bottoms of the rotating grooves form limiting surfaces; the two roll shafts are respectively matched with the two rotating grooves in a rotating way and are suitable for being limited by the limiting surface; and at least in the direction towards the printing roller, the size of the rotary groove is greater than the size of the roller shaft, the rotary groove is used for the roller shaft to rotate on the one hand, the limiting effect can be provided on the other hand, and at least in the direction towards the printing roller, the size of the rotary groove is greater than the size of the roller shaft, so that the roller shaft can move along the direction towards the printing roller or the direction away from the printing roller, and the self-adaptive printing medium pressing is realized.

5. In the fifth aspect and the preferred embodiments thereof, the cross section of each rotary groove perpendicular to the direction of the rotation axis is U-shaped, and the shaft diameter of the roller shaft is the same as the groove diameter of the rotary groove, so that the pressing roller does not have freedom degree in the paper feeding direction of the printing medium, and the pressing roller and the line contacted by the printing medium are on the same straight line, so that the printing medium is stressed more uniformly in the paper feeding direction.

6. In a sixth aspect and the preferred embodiments thereof, the elastic member is a torsion spring, and the first elastic end and the second elastic end are respectively abutted against the frame body and the abutting roller, wherein the first elastic end is used for limiting the position, so that the second elastic end can apply force to the abutting roller, and the second elastic end is in line contact with the abutting roller, so that the abutting roller is easier to rotate under the friction force of the printing medium, and the problem that the abutting roller is not rotated and causes damage to the printing medium is solved.

Be equipped with the annular on the pressure roller, the annular is located the middle part of pressure roller, and the annular is arranged in to the second elastic end to have spacing effect to the second elastic end, prevent because of the rocking of second elastic end, lead to the second elastic end to the deviation in position of the power of pressure roller, make pressure roller atress position unstable, pressure roller slope, then print medium is protruding easily, finally influences the problem of printing effect.

7. In the seventh aspect and the preferred embodiments thereof, the pressing roller is provided with two pressing portions, the two pressing portions are both adapted to be exposed from the first hole to press the printing medium, the two pressing portions are symmetrically disposed at two sides of the ring groove along the rotation axis direction, so that the biasing forces of the second elastic ends on the two pressing portions are the same, the two ends of the pressing roller can uniformly apply force to the printing medium, and the printing medium can be guaranteed to be attached to the printing roller.

8. In an eighth aspect and the preferred embodiment thereof, each of the pressing rollers corresponds to at least two elastic members

Each elastic piece is arranged between the frame body and the abutting roller, the elastic pieces are distributed along the direction of the rotating axis, pressure towards the printing roller is applied to the abutting roller at least along the two ends of the rotating axis, the abutting roller is contained in the containing cavity and has freedom degrees at least in the directions towards the printing roller and away from the printing roller, under the action of the elastic pieces, the abutting roller moves towards the printing roller until the printing medium is attached to the printing roller, and due to the fact that the two ends of the abutting roller are subjected to pressure, when the two ends of the abutting roller can abut against the printing medium, other positions can abut against the printing medium, and therefore self-adaptive abutting of the printing medium can be achieved.

9. In a ninth aspect and preferred embodiments thereof, a printer includes a printing roller, a frame, and an auxiliary paper pressing device, where the printing roller rotates around a rotation axis relative to the frame, and has the beneficial effects brought by the auxiliary paper pressing device.

10. In a tenth aspect and the preferred embodiments thereof, the printing apparatus further comprises a plurality of printing members, each of the printing members being disposed around the printing roller to print on the printing medium.

The front side of the first printing piece and the rear side of the last printing piece are usually provided with paper feeding channels for positioning printing media, the printing media are not easy to bulge, the printing media are pressed by the printing pieces at the positions of the printing pieces, the printing media at the positions of the printing pieces are not easy to bulge, but if the auxiliary paper pressing devices are not pressed at the gaps between the adjacent printing pieces, the printing media are easy to rebound and bulge at the gaps due to bending when the printing media advance around the printing rollers.

An auxiliary paper pressing device is arranged between two adjacent printing pieces, and each auxiliary paper pressing device is arranged around the printing roller, so that the printing medium is pressed against the auxiliary paper pressing device, the printing medium is prevented from protruding, and meanwhile the printing medium is guided to the next printing piece through the auxiliary paper pressing device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an auxiliary paper pressing device according to a first embodiment;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a top view of an auxiliary paper pressing device according to the first embodiment;

FIG. 4 is a cross-sectional view taken along the A-A plane in FIG. 3;

FIG. 5 is a schematic view showing the cooperation of the roller shaft and the rotary trough in the first embodiment;

FIG. 6 is another schematic view of the cooperation of the roller shaft and the rotary trough in the first embodiment;

FIG. 7 is a schematic diagram of an auxiliary paper pressing device in the second embodiment;

fig. 8 is a front view of a part of the structure of the third printer of the embodiment.

The main reference numerals illustrate:

An auxiliary paper pressing device 10;

A frame body 1; a post 11; a housing chamber 12; a first hole 121; a rotor groove 122; a limit surface 1221; a mounting post 13;

A pressing roller 2; a roller body 21; ring groove 211; a pressing portion 212; a roller shaft 22; an elastic member 3; an annular portion 31; a first spring end 32; a second elastic end 33;

a printing roller 20; a print 30; a rotation axis direction 40; the direction of paper feed 50.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is to be understood that the described embodiments are preferred embodiments of the utility model and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without creative efforts, are within the protection scope of the present utility model.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings of the present utility model, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the utility model.

In the claims, specification and drawings of the present utility model, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present utility model, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

Example 1

Referring to fig. 1 to 6, an auxiliary paper pressing device 10 is used for pressing a printing medium, enabling the printing medium to be attached to a printing roller 20, enabling the printing roller 20 to rotate around a rotation axis relative to a frame, and the auxiliary paper pressing device 10 comprises a frame body 1, a pressing roller 2 and an elastic piece 3;

The frame body 1 is fixedly connected with the frame, and the frame body 1 and the frame are fixedly connected in an integrated manner, can be bonded, or can be connected in a threaded manner, a clamping manner, a plugging manner and the like, so that the frame body 1 is installed. In this embodiment, referring to fig. 1, two inserting posts 11 are disposed on two sides of the frame 1 along the rotation axis direction 40, and the two inserting posts 11 are inserted into inserting holes on the frame, so as to limit the degree of freedom of the frame 1.

The frame body 1 can be used for being installed against the compression roller 2 and the elastic piece 3. Referring to fig. 4, the frame 1 is provided with at least one accommodating chamber 12 along the rotation axis direction 40, and in this embodiment, the number of accommodating chambers 12 is three; the housing chamber 12 is provided with at least one first hole 121 towards the printing roller 20, the first hole 121 being intended for exposing a portion of the pressing roller 2. The accommodating cavity 12 is further provided with two rotating grooves 122, the two rotating grooves 122 are arranged at intervals along the rotation axis direction 40, the groove bottom of the rotating groove 122 forms a limiting surface 1221 deviating from the printing roller 20, the printing roller 20 can be placed in the accommodating cavity 12 through the arrangement of the limiting surface 1221 and then is mounted on the frame together with the support, the pressing roller 2 does not need to fall out from the first hole 121 due to gravity in the mounting process, and the assembly is convenient. The frame 1 is further provided with a mounting post 13, the mounting post 13 extending in the direction 40 of the rotational axis and being located at a side of the receiving groove facing away from the printing roller 20.

In this embodiment, referring to fig. 4, the number of the pressing rollers 2 is equal to and corresponds to the number of the accommodating cavities 12, each pressing roller 2 is disposed in the accommodating cavity 12, and a portion of the pressing roller 2 is suitable for being exposed from the first hole 121 to press the printing medium, so that the printing medium is attached to the printing roller 20, and protruding and wrinkling of the printing medium are prevented, thereby affecting the printing effect. The pressure-applying roller 2 has a degree of freedom at least in the direction toward the printing roller 20 and away from the printing roller 20 when accommodated in the accommodation chamber 12, so as to be adapted to move toward the printing roller 20 or away from the printing roller 20.

In the present embodiment, referring to fig. 4, each pressing roller 2 is provided with a roller body 21 and two roller shafts 22, the roller body 21 being adapted to expose the accommodating chamber 12 from the first hole 121; the roller body 21 of the pressing roller 2 is provided with a ring groove 211 and two pressing parts 212, the two pressing parts 212 are symmetrically arranged at two sides of the ring groove 211 along the rotation axis direction 40, and the two pressing parts 212 are suitable for being exposed from the first hole 121 to press the printing medium. The ring groove 211 is located in the middle of the pressing roller 2, and the bottom of the ring groove 211 is not in contact with the printing medium.

The roller shafts 22 are respectively disposed at two sides of the roller body 21, specifically, the roller shafts 22 are connected to the pressing portion 212, and the two rollers extend along the rotation axis direction 40 and deviate from each other. The two ends of the roll shaft 22 are respectively in running fit with the two rotating grooves 122; and the size of the rotary groove 122 is larger than the size of the roller shaft 22 at least in the direction toward the printing roller 20, so that the platen roller 2 has a degree of freedom at least in the direction toward the printing roller 20 and away from the printing roller 20, for example, the cross section of the rotary groove 122 perpendicular to the rotation axis direction 40 is U-shaped, elliptical, circular or other shape, and as shown in fig. 5, the roller shaft 22 is movable in a plurality of directions when the size of the roller shaft 22 is smaller than the groove diameter of the rotary groove 122. In this embodiment, as shown in fig. 6, the cross section of the rotary slot 122 perpendicular to the rotation axis direction 40 is U-shaped, and the shaft diameter of the roller shaft 22 is the same as the slot diameter of the rotary slot 122, so that the pressing rollers 2 do not have a degree of freedom in the paper feeding direction 50 of the printing medium, and thus the lines where the pressing rollers 2 contact with the printing medium are on the same line, so that the printing medium is stressed more uniformly in the paper feeding direction 50.

Of course, in addition to the manner of achieving the degrees of freedom described above, the two-turn grooves 122 may be provided such that one of them has the degrees of freedom in the directions toward the print roller 20 and away from the print roller 20, and the other does not have the manner of having the degrees of freedom in the directions toward the print roller 20 and away from the print roller 20. For example, one of the rotor grooves 122 has a size greater than the size of the roller shaft 22, and the other rotor groove 122 has a size equal to the size of the roller shaft 22.

Referring to fig. 4, the elastic members 3 are provided corresponding to the pressing rollers 2, and in this embodiment, the number of the elastic members 3 is the same as and one-to-one corresponding to the number of the pressing rollers 2, and the elastic members 3 are provided between the frame body 1 and the pressing rollers 2 to apply pressure to the pressing rollers 2 toward the printing roller 20. Under the action of the elastic piece 3, the abutting roller 2 moves towards the direction of the printing roller 20 until the abutting roller 2 enables the printing medium to be attached to the printing roller 20, and as each abutting roller 2 is independently biased, the self-adaptive abutting of the printing medium can be realized, so that the printing medium can be abutted against the printing roller 20 along the width direction of the printing medium, the printing medium is uniformly stressed, and the paper feeding is not biased.

In this embodiment, the elastic member 3 is preferably a torsion spring, and the torsion spring is mounted on the frame body 1, specifically, referring to fig. 2, the annular portion 31 of the torsion spring is sleeved on the mounting post 13 of the frame body 1. The torsion spring further comprises a first elastic end 32 and a second elastic end 33, wherein the first elastic end 32 is propped against the frame body 1, and the second elastic end 33 is propped against the propping roller 2 and is in line contact with the propping roller 2. The first elastic end 32 is used for limiting the position, so that the second elastic end 33 can apply force to the pressing roller 2, and the friction force between the second elastic end 33 and the pressing roller 2 is small due to the fact that the second elastic end 33 is in line contact with the pressing roller 2, so that the pressing roller 2 is easier to rotate under the friction force of the printing medium, and the problem that the pressing roller 2 does not rotate, and the printing medium is damaged is prevented.

Referring to fig. 2 and 4, the second elastic end 33 is disposed in the ring groove 211, so that the second elastic end 33 has a limiting effect, and the problem that the printing medium is easy to bulge and finally affects the printing effect due to the fact that the second elastic end 33 is prevented from shaking to cause the deviation of the force of the second elastic end 33 to the pressing roller 2, so that the stress position of the pressing roller 2 is unstable, and the pressing roller 2 is inclined. And the two pressing portions 212 are symmetrically disposed on two sides of the ring groove 211 along the rotation axis direction 40, so that the biasing forces of the second elastic ends 33 to the two pressing portions 212 are the same, and the two ends of the pressing roller 2 can uniformly apply force to the printing medium, so as to ensure that the printing medium can be attached to the printing roller 20.

It should be appreciated that in other embodiments, the roller body 21 may be limited by the limiting surface 1221 to prevent the pressing roller 2 from being separated from the accommodating cavity 12, for example, an end of the first hole 121, which is far away from the printing roller 20, is open on the limiting surface 1221, and a portion of the roller body 21 is exposed from the first hole 121 and is in line contact with the limiting surface 1221.

Example two

Unlike the first embodiment, the number of printing rollers 20 and elastic members 3 is the same and corresponds to one another, and in the first embodiment, each pressing roller 2 corresponds to at least two elastic members 3, for example, referring to fig. 7, the number of accommodating chambers 12 and printing rollers 20 is one, and the number of elastic members 3 is a plurality of

Specifically, an auxiliary paper pressing device 10 is used for pressing a printing medium, so that the printing medium is attached to a printing roller 20, the printing roller 20 rotates around a rotation axis relative to a frame, and the auxiliary paper pressing device 10 comprises a frame body 1, a pressing roller 2 and an elastic piece 3.

The frame body 1 is fixedly connected to the frame and is provided with a containing cavity 12 extending along the rotation axis direction 40, the containing cavity 12 is provided with at least one first hole 121 towards the printing roller 20, one first hole 121 can be provided, a plurality of first holes can be provided, and in the embodiment, three first holes 121 are provided.

Only one abutting roller 2 is arranged in the accommodating cavity 12, and the part of the abutting roller 2 is suitable for being exposed from the first hole 121 to abut against the printing medium so as to enable the printing medium to be attached to the printing roller 20; the pressure roller 2 has a degree of freedom at least in the direction toward the printing roller 20 and away from the printing roller 20 when accommodated in the accommodation chamber 12.

The elastic members 3 are provided in at least two, each elastic member 3 is provided between the frame body 1 and the pressing roller 2, and each elastic member 3 is arranged in the rotation axis direction, and applies pressure toward the printing roller 20 to at least both ends of the pressing roller 2 in the rotation axis direction 40. Under the effect of elastic component 3, support compression roller 2 and move towards the direction of printing roller 20 until support compression roller 2 makes printing medium laminating in printing roller 20, because both ends of support compression roller 2 all receive pressure, when support compression roller 2 both ends can support printing medium, other positions also can support the printing medium, can realize the self-adaptation and support the printing medium, along the width direction of printing medium like this, printing medium homoenergetic supports in printing roller 20, makes printing medium atress even, the paper feed is not walked and is inclined to one side.

In this embodiment, the elastic member 3 may be a torsion spring, and the pressing roller 2 is provided with a number of ring grooves 211 corresponding to the number of ring grooves.

Example III

Referring to fig. 8, a printer includes a print roller 20, a frame, a plurality of print members 30, and an auxiliary platen 10 as in the first or second embodiment described above.

The print roller 20 rotates about a rotational axis relative to the frame, and the print roller 20 is adapted to transport and support print media.

Each print member 30 is disposed around the print roller 20, and the number of print members 30 may be three or four, and four may be used to print cyan, magenta, yellow, and black, respectively, and three may be used to print cyan, magenta, and yellow, respectively. Of course, the number of prints 30 may be other numbers.

An auxiliary paper pressing device 10 is arranged between two adjacent printing pieces 30, each auxiliary paper pressing device 10 is arranged around the printing roller 20, so that printing media are pressed against each other, the printing media are prevented from protruding, and meanwhile, the printing media are guided to the next printing piece 30 through the auxiliary paper pressing device 10.

The foregoing description of the embodiments and description is presented to illustrate the scope of the utility model, but is not to be construed as limiting the scope of the utility model. Modifications, equivalents, and other improvements to the embodiments of the utility model or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the utility model or the teachings of the embodiments, are intended to be included within the scope of the utility model, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.

Claims (10)

1. An auxiliary paper pressing device for pressing a printing medium to enable the printing medium to be attached to a printing roller (20), wherein the printing roller (20) rotates around a rotation axis relative to a frame, and the auxiliary paper pressing device is characterized by comprising:

The frame body (1) is fixedly connected to the frame, at least one accommodating cavity (12) is arranged along the rotation axis direction (40), and at least one first hole (121) is formed in the accommodating cavity (12) towards the printing roller (20);

A pressing roller (2), wherein the pressing roller (2) is arranged in at least one accommodating cavity (12), and a part of the pressing roller (2) is suitable for being exposed from the first hole (121) to press the printing medium, so that the printing medium is attached to the printing roller (20); -the counter roller (2) has a degree of freedom at least in the direction towards the printing roller (20) and away from the printing roller (20) when housed in the housing chamber (12); and

And an elastic member (3) which is disposed in correspondence with the pressing roller (2) and is disposed between the frame body (1) and the pressing roller (2) so as to apply pressure to the pressing roller (2) toward the printing roller (20).

2. An auxiliary paper pressing apparatus as defined in claim 1, wherein: the number of the pressing rollers (2) is equal to that of the accommodating cavities (12) and corresponds to that of the accommodating cavities one by one, and the number of the elastic pieces (3) is equal to that of the pressing rollers (2) and corresponds to that of the accommodating cavities one by one.

3. An auxiliary paper pressing apparatus as defined in claim 1, wherein: a limiting surface (1221) deviating from the printing roller (20) is arranged in the accommodating cavity (12), each pressing roller (2) is provided with a roller body (21) and two roller shafts (22), and the roller bodies (21) are suitable for exposing the accommodating cavity (12) from the first holes (121); the roll shaft (22) or the roll body (21) is suitable for being limited by the limiting surface (1221) so as to prevent the pressing roll (2) from being separated from the accommodating cavity (12).

4. An auxiliary paper pressing apparatus as claimed in claim 3, wherein: the accommodating cavity (12) is provided with two rotating grooves (122), and the groove bottoms of the rotating grooves (122) form the limiting surface (1221); the two roll shafts (22) are respectively in running fit with the two rotary grooves (122) and are suitable for being limited by the limiting surfaces (1221); and the size of the rotary groove (122) is larger than the size of the roller shaft (22) at least in the direction towards the printing roller (20).

5. An auxiliary paper pressing apparatus as defined in claim 4, wherein: the cross section of each rotary groove (122) perpendicular to the rotation axis direction (40) is U-shaped, and the shaft diameter of the roll shaft (22) is the same as the groove diameter of the rotary groove (122).

6. An auxiliary paperweight as claimed in any one of claims 2 to 5, wherein: the elastic piece (3) is a torsion spring, the torsion spring is arranged on the frame body (1) and comprises a first elastic end (32) and a second elastic end (33), the first elastic end (32) is propped against the frame body (1), and the second elastic end (33) is propped against the propping roller (2) and is in line contact with the propping roller (2); the pressing roller (2) is provided with a ring groove (211), the ring groove (211) is arranged on the pressing roller (2), and the second elastic end (33) is arranged in the ring groove (211).

7. An auxiliary paper pressing apparatus as defined in claim 6, wherein: the pressing roller (2) is provided with two pressing parts (212), the two pressing parts (212) are symmetrically arranged on two sides of the ring groove (211) along the rotation axis direction (40), and the two pressing parts (212) are both suitable for being exposed from the first hole (121) to press the printing medium.

8. An auxiliary paper pressing apparatus as defined in claim 1, wherein:

Each pressing roller (2) at least corresponds to two elastic pieces (3), and each elastic piece (3) is distributed along the rotation axis direction (40), and at least applies pressure towards the printing roller (20) to two ends of the pressing roller (2) along the rotation axis direction (40).

9. A printer, characterized by: comprising a printing roller (20), a frame and an auxiliary platen (10) according to any one of claims 1-8 or an auxiliary platen (10) according to claim 8, said printing roller (20) being rotatable about an axis of rotation with respect to the frame.

10. A printer as claimed in claim 9, wherein: the printing device further comprises a plurality of printing pieces (30), each printing piece (30) is arranged around the printing roller (20), an auxiliary paper pressing device (10) is arranged between two adjacent printing pieces (30), and each auxiliary paper pressing device (10) is arranged around the printing roller (20).