Paper flattening mechanism of printer

Abstract

The utility model provides a paper flattening mechanism of a printer, which comprises an upper fixing piece and a lower fixing piece which are matched with each other, the upper fixing piece and the lower fixing piece are closed to form a containing cavity used for containing a paper roll and a paper output channel used for outputting paper, and a bent channel, an upper rolling shaft and a lower rolling shaft are arranged at the position, close to the containing cavity, of the paper output channel. The local paper feeding direction of the bent channel is opposite to the winding direction of the paper roll, the upper rolling shaft and the lower rolling shaft are at least partially overlapped in the vertical direction, and the winding directions of the bent channel on the upper rolling shaft and the lower rolling shaft are opposite; the paper flattening mechanism disclosed by the utility model is better in flattening effect.

Description

Technical Field

[0001] The utility model relates to the field of thermal printers, in particular to a paper flattening mechanism of a printer. Background Art

[0002] When using roll paper, the general thermal printer will cause the paper to be uneven, and an effective paper flattening mechanism is needed. However, when the existing paper flattening mechanism flattens the paper, the angle of the paper folding back is small, resulting in poor flattening effect. Utility Model Content

[0003] The utility model aims to provide a paper flattening mechanism of a printer with better flattening effect.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a paper flattening mechanism of a printer, comprising an upper fixing member and a lower fixing member that cooperate with each other, the upper fixing member and the lower fixing member are covered to form a receiving cavity for placing a paper roll and a paper output channel for outputting paper, and a curved channel, an upper roller and a lower roller are arranged near the receiving cavity of the paper output channel, the local paper feeding direction of the curved channel is opposite to the winding direction of the paper roll, the upper roller and the lower roller at least partially overlap in the up and down direction, and the winding directions of the curved channel at the upper roller and the lower roller are opposite.

[0005] It can be seen from the above scheme that by setting a curved channel in which the local paper feeding direction is opposite to the paper roll winding direction, it is used to reversely correct the paper and realize the flattening function; by setting the upper roller and the lower roller to at least partially overlap in the up and down directions, it is beneficial to increase the folding angle of the paper when it passes through the upper roller and the lower roller, thereby further improving the paper flattening effect.

[0006] A further solution is that the curved channel extends along an S shape, and the curved channel includes a first curved channel and a second curved channel that are connected. The first curved channel is formed between the lower roller and the upper fixing member, and the paper feeding direction of the first curved channel is the same as the winding direction of the paper roll. The second curved channel is formed between the upper roller and the lower fixing member, and the paper feeding direction of the second curved channel is opposite to the winding direction of the paper roll.

[0007] It can be seen from the above solution that the provision of an S-shaped curved channel is conducive to flattening the paper.

[0008] A further solution is that, along the paper feeding direction, the lower roller is arranged upstream of the upper roller, or the lower roller is arranged downstream of the upper roller.

[0009] A further solution is that the height position of the lower roller is adjustable. When the cover is opened, the lower roller is located below the paper outlet passage and close to the lower fixing member. After the cover is closed, the lower roller is located above the upper roller.

[0010] It can be seen from the above scheme that by providing a lower roller with adjustable height, it is convenient to install and replace the paper roll.

[0011] A further solution is that the lower fixing member is provided with a rotating shaft, a lower bracket and a reset spring, the lower bracket is rotatably connected to the lower fixing member through the rotating shaft, the reset spring is connected between the lower bracket and the lower fixing member and is used to reset the lower bracket, the lower roller is connected to the lower bracket, and the lower bracket is provided with a force-bearing part for driving it to rotate.

[0012] It can be seen from the above scheme that by applying force to the force-bearing part, the lower bracket is driven to rotate around the rotating shaft, thereby driving the lower roller to rotate to adjust the position of the lower roller; by setting a reset spring, it is convenient to automatically reset when the force applied by the force-bearing part disappears, so that the lower roller automatically returns to the lower position.

[0013] A further solution is that the lower bracket includes a first arm and a second arm intersecting at an angle, a hinged portion for installing a rotating shaft is provided at the connection between the first arm and the second arm, the first arm is provided with a mounting portion for installing a lower roller, the force-bearing portion is provided on the second arm, and the distance from the force-bearing portion to the hinged portion is greater than the distance from the mounting portion to the hinged portion.

[0014] It can be seen from the above scheme that by setting the distance from the force-bearing part to the hinge part to be greater than the distance from the mounting part to the hinge part, the lever principle is utilized to achieve a labor-saving effect.

[0015] A further solution is that an inclined surface and a connecting hole are provided on the first arm, the connecting hole is provided on one side of the inclined surface, and one end of the return spring is provided on the inclined surface and connected to the connecting hole.

[0016] It can be seen from the above scheme that by providing the inclined surface and the connecting hole, it is convenient to accurately install the reset spring and prevent the reset spring from being separated from the lower bracket.

[0017] A further solution is that the upper fixing member is provided with an upper bracket, the upper roller is connected to the upper bracket and protrudes toward the lower fixing member, and the upper bracket is provided with an action portion corresponding to the force-bearing portion.

[0018] It can be seen from the above scheme that by providing the acting part, when the cover is closed, the acting part automatically applies force to the force-bearing part, thereby driving the lower roller to rotate, without manual operation, and has the advantage of convenient operation.

[0019] A further solution is that the action portion extends along the rotation direction of the lower bracket, and the force-bearing portion is provided with an arc surface, and the arc surface abuts and cooperates with the action portion.

[0020] It can be seen from the above solution that the arc surface is in abutment with the action part, so that during the rotation of the lower bracket, the arc surface is always in abutment with the action part, ensuring that the lower bracket can be rotated into place.

[0021] A further solution is that the upper bracket includes a connecting portion and a mounting arm for mounting the upper roller, the mounting arm and the action portion both protrude from the surface of the connecting portion, and the protruding height of the action portion is smaller than the protruding height of the mounting arm.

[0022] It can be seen from the above scheme that by setting the raised height of the force-bearing part smaller than the raised height of the mounting arm, it is ensured that the upper roller approaches the paper outlet channel first, and then the action part pushes the lower bracket to rotate upward, avoiding the collision between the lower roller and the upper roller when the lower bracket rotates upward. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the embodiment of the utility model when the cover is opened.

[0024] Figure 2 It is a cross-sectional view of the embodiment of the utility model when the cover is closed.

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 It is an exploded view of the lower fixing member, the lower bracket and the lower roller in the embodiment of the utility model.

[0027] Figure 5 It is a structural diagram of the lower bracket and the lower roller in the embodiment of the utility model.

[0028] Figure 6 It is an exploded view of the upper fixing member, the upper bracket and the upper roller in the embodiment of the utility model.

[0029] Figure 7 It is a structural diagram of an upper bracket and an upper roller in an embodiment of the utility model.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0031] See also Figures 1 to 3 The present embodiment provides a paper flattening mechanism for a printer, comprising an upper fixing member 10 and a lower fixing member 20 that cooperate with each other. The upper fixing member 10 is hinged to the lower fixing member 20, and the upper fixing member 10 can rotate around the hinge between the two to realize opening and closing of the cover.

[0032] The upper fixing member 10 and the lower fixing member 20 are combined to form a housing chamber 30 for placing the paper roll 50 and a paper output channel 40 for outputting the paper, and the paper output channel 40 is arranged on one side of the housing chamber 30 and communicates with the housing chamber 30. The paper output channel 40 can extend in the horizontal direction, or the paper output channel 40 can extend in the vertical direction, and the former is preferred in this embodiment.

[0033] The paper outlet channel 40 is provided with a curved channel, an upper roller 1 and a lower roller 2 near the accommodating chamber 30. The local paper feeding direction of the curved channel is opposite to the winding direction of the paper roll 50 itself. The winding direction or the surrounding direction of the paper roll 50 itself refers to the paper being wound clockwise or counterclockwise into a roll. In this embodiment, clockwise winding is taken as an example, and the local paper feeding of the curved channel is counterclockwise. The winding directions of the curved channel at the upper roller 1 and the lower roller 2 are opposite, so that the paper will automatically reverse and offset after passing through the curved channel, so that the originally bent paper tends to be straight.

[0034] Specifically, the curved channel extends in an "S" shape, and includes a first curved channel 401 and a second curved channel 402 that are connected. The first curved channel 401 is formed between the lower roller 2 and the upper fixing member 10, and the paper feeding direction of the first curved channel 401 is the same as the winding direction of the paper roll 50, that is, the first curved channel 401 feeds paper clockwise; the second curved channel 402 is formed between the upper roller 1 and the lower fixing member 20, and the paper feeding direction of the second curved channel 402 is opposite to the winding direction of the paper roll 50, that is, the second curved channel 402 feeds paper counterclockwise.

[0035] Furthermore, the upper roller 1 and the lower roller 2 at least partially overlap in the vertical direction. That is, in the horizontal projection plane, the projections of the upper roller 1 and the lower roller 2 at least partially overlap, so that when the paper passes through the second arc-shaped channel 402, the angle and degree of the paper folding are increased, which is conducive to improving the flattening effect.

[0036] In this embodiment, along the paper feeding direction, the lower roller 2 is arranged upstream of the upper roller 1, that is, the lower roller 2 is located on the left side of the upper roller 1. When the paper is discharged, the paper first passes around the lower roller 2 and then passes around the upper roller 1.

[0037] In other embodiments, along the paper feeding direction, the lower roller is arranged downstream of the upper roller, that is, the lower roller is located on the right side of the upper roller. When the paper is discharged, the paper first passes around the upper roller and then passes around the lower roller.

[0038] See also Figure 4 and Figure 5 , and combined with Figure 1 The lower fixing member 20 is provided with two rotating shafts 4, two lower brackets 3 and two return springs 5.

[0039] Both ends of the lower fixing member 20 are provided with mounting grooves 201 , and the lower bracket 3 is rotatably disposed in the mounting grooves 201 via a rotating shaft 4 .

[0040] The lower bracket 3 is set in a "V" shape, and the lower bracket 3 includes a first arm 31 and a second arm 32 that intersect at an angle. A hinged portion for installing the rotating shaft 4 and an annular flange 34 for installing the reset spring 5 are provided at the connection between the first arm 31 and the second arm 32. The hinged portion is preferably a rotating shaft mounting hole 33, and the rotating shaft mounting hole 33 is coaxially arranged with the annular flange 34. A lower roller mounting hole 311 for installing the lower roller 2 is provided at one end of the first arm 31 away from the hinged portion. A force-bearing portion 321 for driving the lower bracket 3 to rotate is provided at one end of the second arm 32 away from the hinged portion, and the force-bearing portion 321 is preferably set as an arc surface. When the lower bracket 3 is set in the mounting groove 201, the force-bearing portion 321 protrudes out of the mounting groove 201.

[0041] The reset spring 5 is connected between the lower bracket 3 and the lower fixing member 20. The reset spring 5 is preferably a torsion spring, the middle part of which is sleeved on the rotating shaft 4 or the annular flange 34; the first end of the torsion spring is connected to the lower bracket 3, and the second end of the torsion spring abuts against the groove wall or the groove bottom of the installation groove 201, which is used to reset the lower bracket 3. Specifically, an inclined surface and a connecting hole are provided on the first arm 31, and the connecting hole is provided on one side of the inclined surface. The first end of the torsion spring is provided on the inclined surface and connected to the connecting hole, so as to facilitate accurate installation of the torsion spring and prevent the torsion spring from being accidentally separated from the lower bracket 3.

[0042] The two ends of the lower roller 2 are respectively connected to the two lower brackets 3, and the height position of the lower roller 2 is adjustable. When an external force is applied to the force-bearing portion 321, the lower bracket 3 can rotate around the rotating shaft 4, thereby driving the lower roller 2 to rotate upward, so that the lower roller 2 is located at a high position to form an S-shaped curved channel to flatten the paper. When the external force disappears, the lower bracket 3 rotates under the action of the reset spring 5. At this time, the lower roller 2 is located at a low position, which is convenient for installing and replacing the paper roll 50, and the paper extending from the paper roll 50 is located on the lower roller 2.

[0043] Furthermore, the hinged portion is arranged between the lower roller mounting hole 311 and the force-bearing portion 321, and the distance from the force-bearing portion 321 to the hinged portion is greater than the distance from the lower roller 2 to the hinged portion. By utilizing the lever principle, it is beneficial to drive the lower bracket 3 and the lower roller 2 to rotate with a smaller driving force, thereby achieving the purpose of saving effort.

[0044] See also Figure 6 and Figure 7 , and combined with Figure 2 and Figure 5, upper brackets 6 are provided at both ends of the upper fixing member 10, and the upper roller 1 is connected to the two upper brackets 6, and the upper roller 1 protrudes from the upper fixing member 10 in the direction of the lower fixing member 20. Specifically, the upper bracket 6 includes a connecting portion 62 and a mounting arm 61. The mounting arm 61 obliquely protrudes from the surface of the connecting portion 62, and the mounting arm 61 is provided with an upper roller mounting hole 611 for mounting the upper roller 1. The connecting portion 62 is used to be fixedly connected to the upper fixing member 10, and the connecting portion 62 is provided with an action portion 621 for applying a force to the force-bearing portion 321, and the action portion 621 is set to a long strip structure matching the force-bearing portion 321. The action portion 621 protrudes from the surface of the connecting portion 62, and the protruding height of the action portion 621 is less than the protruding height of the mounting arm 61.

[0045] When the cover is opened, the upper fixing member 10 drives the upper roller 1 to flip upward. At this time, the upper roller 1 is located above the paper outlet passage 40, and the lower roller 2 is located below the paper outlet passage 40, which is convenient for installing and replacing printing paper.

[0046] When closing the cover, the upper fixing member 10 drives the upper roller 1 to turn downward, and the upper roller 1 approaches the paper outlet channel 40 and gradually presses the paper downward, so that the paper bends in the opposite direction; then, the action part 621 contacts the force-bearing part 321 and pushes the lower bracket 3 to rotate upward to avoid the collision between the lower roller 2 rotating upward and the upper roller 1. At this time, the lower roller 2 pushes the paper upward to increase the folding angle and degree of the paper at the upper roller 1 to improve the paper flattening effect; in this process, the arc surface of the force-bearing part 321 can always keep in contact with the action part 621 to ensure that the lower bracket 3 rotates in place. And after the cover is closed, the lower roller 2 is located above the paper outlet channel 40, and the upper roller 1 is located below the paper outlet channel 40. The positions of the upper roller 1 and the lower roller 2 are staggered, thereby increasing the folding angle and flattening effect of the paper.

[0047] The lower roller 2 of this embodiment is driven to rotate by the force of the upper bracket 6 on the lower bracket 3 when the cover is closed, and no manual rotation is required throughout the whole process, which has the advantages of simple and convenient operation.

[0048] In summary, the utility model provides a curved channel whose local paper feeding direction is opposite to the paper roll winding direction, so as to correct the paper in the opposite direction and realize the flattening function; and by providing the upper roller and the lower roller to overlap at least partially in the up and down directions, it is beneficial to increase the folding angle of the paper when passing through the upper roller and the lower roller, thereby further improving the paper flattening effect.

[0049] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A paper flattening mechanism for a printer, comprising an upper fixing member and a lower fixing member that cooperate with each other, wherein the upper fixing member and the lower fixing member are combined to form a receiving cavity for placing a paper roll and a paper output channel for outputting paper, characterized in that: The paper outlet channel is provided with a curved channel, an upper roller and a lower roller near the accommodating cavity. The local paper feeding direction of the curved channel is opposite to the winding direction of the paper roll. The upper roller and the lower roller at least partially overlap in the up and down directions. The winding directions of the curved channel at the upper roller and the lower roller are opposite.

2. The paper flattening mechanism of the printer according to claim 1, characterized in that: The curved channel extends in an S shape, and includes a first arc channel and a second arc channel that are connected. The first arc channel is formed between the lower roller and the upper fixing member, and the paper feeding direction of the first arc channel is the same as the winding direction of the paper roll. The second arc channel is formed between the upper roller and the lower fixing member, and the paper feeding direction of the second arc channel is opposite to the winding direction of the paper roll.

3. The paper flattening mechanism of the printer according to claim 2, characterized in that: Along the paper feeding direction, the lower roller is arranged upstream of the upper roller, or the lower roller is arranged downstream of the upper roller.

4. The paper flattening mechanism of a printer according to claim 1, characterized in that: The height position of the lower roller is adjustable. When the cover is opened, the lower roller is located below the paper outlet passage and close to the lower fixing member. When the cover is closed, the lower roller is located above the upper roller.

5. The paper flattening mechanism of a printer according to claim 1, characterized in that: The lower fixing member is provided with a rotating shaft, a lower bracket and a reset spring. The lower bracket is rotatably connected to the lower fixing member via the rotating shaft. The reset spring is connected between the lower bracket and the lower fixing member and is used to reset the lower bracket. The lower roller is connected to the lower bracket, and the lower bracket is provided with a force-bearing part for driving the rotation thereof.

6. The paper flattening mechanism of the printer according to claim 5, characterized in that: The lower bracket includes a first arm and a second arm intersecting at an angle, a hinged portion for installing the rotating shaft is provided at the connection between the first arm and the second arm, the first arm is provided with a mounting portion for installing the lower roller, the force-bearing portion is provided on the second arm, and the distance from the force-bearing portion to the hinged portion is greater than the distance from the mounting portion to the hinged portion.

7. The paper flattening mechanism of a printer according to claim 6, characterized in that: The first arm is provided with an inclined surface and a connecting hole, wherein the connecting hole is provided at one side of the inclined surface, and one end of the return spring is provided on the inclined surface and connected to the connecting hole.

8. The paper flattening mechanism of a printer according to claim 5, characterized in that: The upper fixing member is provided with an upper bracket, the upper roller is connected to the upper bracket and protrudes toward the lower fixing member, and the upper bracket is provided with an action portion corresponding to the force-bearing portion.

9. The paper flattening mechanism of a printer according to claim 8, characterized in that: The action portion extends along the rotation direction of the lower bracket, and the force-bearing portion is provided with an arc surface, and the arc surface is abutted and matched with the action portion.

10. The paper flattening mechanism of a printer according to claim 8, characterized in that: The upper bracket includes a connecting portion and a mounting arm for mounting the upper roller, the mounting arm and the action portion both protrude from the surface of the connecting portion, and the protruding height of the action portion is smaller than the protruding height of the mounting arm.

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