Printing mechanism, needle printer and printing method for improving last dirty paper

Abstract

The invention relates to the technical field of needle printers, and discloses a printing mechanism, a needle printer and a printing method for improving last-position dirty paper.The printing mechanism comprises a printing head assembly, the printing head assembly comprises a base and a needle printing head, a ribbon guide frame is connected to the base, and a guide part is arranged at the lower end of the ribbon guide frame to guide a ribbon; the guide part is positioned below the needle type printing head; the first paper pressing roller is rotationally connected to the base, and the first paper pressing roller is arranged on one side of the guide component; the second paper pressing roller is rotationally connected to the base, the axial direction of the second paper pressing roller is parallel to the axial direction of the first paper pressing roller, and the second paper pressing roller and the first paper pressing roller are arranged in a spaced mode. The printing mechanism is provided with the first paper pressing roller and the second paper pressing roller which are distributed at intervals, and in the printing operation, the first paper pressing roller and the second paper pressing roller press the printing paper at the same time, so that the printing paper can be effectively pressed and flattened, the probability of paper contamination or dyeing is greatly reduced, and the printing quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of dot matrix printers, and in particular to a printing mechanism, a dot matrix printer and a printing method for improving last-position dirty paper. Background Art

[0002] A dot matrix printer is a commonly used printer. When the dot matrix printer is in operation, the print pin hits the ribbon and printing paper, printing a dot matrix on the printing paper, and then the dot matrix is ​​used to form characters or graphics to complete the printing task.

[0003] In the related art, during the printing process, at the last position of the printing paper, there may be a problem that the printing paper cannot be pressed down or smoothed, resulting in dirty paper or unnecessary staining of the printing paper, causing the printed document page to be stained, and even causing the document to be invalidated, affecting the user's business processing. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention proposes a printing mechanism, which improves the last dirty paper and enhances the printing quality through structural improvement.

[0005] The present invention also proposes a dot matrix printer using the printing mechanism.

[0006] The present invention also provides a printing method applied to the above-mentioned dot matrix printer.

[0007] According to an embodiment of the first aspect of the present invention, a printing mechanism is proposed, comprising a print head assembly, a ribbon guide, a first paper press roller and a second paper press roller, the print head assembly comprising a base and a pin-type print head, the pin-type print head being mounted on the lower side of the base; the ribbon guide being connected to the base, a guide component being provided at the lower end of the ribbon guide to guide the ribbon, the guide component being located below the pin-type print head; a first paper press roller being rotatably connected to the base, the first paper press roller being arranged on one side of the guide component; a second paper press roller being rotatably connected to the base, the axial direction of the second paper press roller being parallel to the axial direction of the first paper press roller, and the second paper press roller being arranged at an interval from the first paper press roller along the axial direction of the second paper press roller.

[0008] The printing mechanism of the embodiment of the present invention has at least the following beneficial effects: The printing mechanism is provided with a first paper pressing roller and a second paper pressing roller which are spaced apart. During the printing operation, the first paper pressing roller and the second paper pressing roller press the printing paper at the same time, which can effectively press and smooth the printing paper, greatly reducing the probability of dirty paper or staining, and helping to improve the printing quality.

[0009] According to some embodiments of the first aspect of the present invention, the second paper pressing roller and the first paper pressing roller are distributed on both sides of the guide component.

[0010] According to some embodiments of the first aspect of the present invention, the printing mechanism is provided with a plurality of the second paper pressing rollers, and the second paper pressing rollers are arranged around the guide component and away from one side of the first paper pressing roller.

[0011] According to some embodiments of the first aspect of the present invention, the guide component includes two baffles, which are arranged on both sides of the axis of the first paper pressing roller, and a gap is formed between the two baffles to expose the pin print head, and the side of the baffle facing away from the pin print head is a curved surface.

[0012] According to some embodiments of the first aspect of the present invention, along the axial direction of the first paper pressing roller, the first paper pressing roller covers the gap between the pin print head and the two blocking pieces.

[0013] According to some embodiments of the first aspect of the present invention, a latch and a buckle portion are provided at the upper end of the ribbon guide, the latch is provided on both sides of the ribbon guide, the base is provided with a slot and a buckle slot, the latch is inserted into the slot, and the buckle portion is clamped in the slot.

[0014] According to some embodiments of the first aspect of the present invention, the base is connected to a carriage frame, the carriage frame is provided with two arms, the two arms are distributed on both sides of the base, the sides of the arms are provided with positioning grooves, the upper end of the ribbon guide is provided with a positioning plug, and the positioning plug is inserted into the positioning groove.

[0015] According to some embodiments of the first aspect of the present invention, the base is connected to a sensor fixing plate, a paper width sensor is mounted on the sensor fixing plate, and the paper width sensor faces downward to detect the width of the printing paper.

[0016] A dot matrix printer according to an embodiment of the second aspect of the present invention comprises the printing mechanism described in the embodiment of the first aspect.

[0017] According to an embodiment of the third aspect of the present invention, a printing method for improving the last dirty paper is proposed, which is applied to the dot matrix printer described in the embodiment of the second aspect, wherein the dot matrix printer has a paper feed channel, and the dot matrix printer is provided with a paper detection sensor, and along the paper output direction of the paper feed channel, the paper detection sensor is located downstream of the printing mechanism; The printing method comprises the following steps: S100, when the paper detection sensor does not detect the printing paper, the dot matrix printer adopts bidirectional printing; S200: When the paper detection sensor detects printing paper, the dot matrix printer adopts unidirectional printing.

[0018] The printing method of the embodiment of the present invention has at least the following beneficial effects: When the printing paper prints to the last line, the paper detection sensor detects the printing paper. The dot matrix printer adopts one-way printing, which reduces the printing speed, helps the mechanism to flatten the printing paper, greatly reduces the probability of dirty paper or staining, and helps to improve the printing quality.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 The structure of the printing mechanism of the first embodiment of the present invention is schematically shown in FIG. Figure 1 ; Figure 2 is an exploded schematic diagram of a printing mechanism of an embodiment of the first aspect of the present invention; Figure 3 The structure of the printing mechanism of the first embodiment of the present invention is schematically shown in FIG. Figure 2 ; Figure 4 It is a schematic structural diagram of the paper feeding path portion of a dot matrix printer in an embodiment of the third aspect of the present invention.

[0021] Figure Number: Printing mechanism 100; Print head assembly 200, base 210, slot 211, pin print head 220, sensor fixing plate 230, paper width sensor 240; The ribbon guide frame 300, the guide component 310, the latch 320, the buckle portion 330, and the positioning insert 340; A first paper pressing roller 410 and a second paper pressing roller 420; The carriage frame 500, the support arm 510, and the positioning groove 511; Paper feeding channel 600 and paper detection sensor 610 . DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Reference Figures 1 to 3 The embodiment of the first aspect of the present invention provides a printing mechanism 100, including a print head assembly 200, a ribbon guide 300, a first paper pressing roller 410 and a second paper pressing roller 420. The print head assembly 200 includes a base 210 and a needle-type print head 220. The base 210 is connected to a carriage frame 500 and serves as an installation basis to fix components such as the ribbon guide 300, the first paper pressing roller 410 and the second paper pressing roller 420. The carriage drives the print head assembly 200 to move through the carriage frame 500 to achieve unidirectional or bidirectional printing, and the needle-type print head 220 is installed on the lower side of the base 210. The printing needle of the needle-type print head 220 hits the ribbon and the printing paper to print a dot matrix on the printing paper, and then the dot matrix is ​​used to form characters or graphics to complete the printing task.

[0027] The ribbon guide 300 is connected to the base 210. A guide component 310 is provided at the lower end of the ribbon guide 300 to guide the ribbon. The guide component 310 is located below the dot matrix print head 220, so that the ribbon passes under the dot matrix print head 220 with accurate positioning, which is conducive to obtaining clear and accurate printing patterns.

[0028] Among them, the first paper pressing roller 410 and the second paper pressing roller 420 are both rotatably connected to the base 210, and the axial direction of the second paper pressing roller 420 is parallel to the axial direction of the first paper pressing roller 410. Along the axial direction of the second paper pressing roller 420, the first paper pressing roller 410 is arranged on one side of the guide component 310, and the second paper pressing roller 420 and the first paper pressing roller 410 are arranged at an interval, so that the second paper pressing roller 420 and the first paper pressing roller 410 have a certain interval distance. The second paper pressing roller 420 and the first paper pressing roller 410 are pressed at different positions of the printing paper to form two paper pressings, thereby reducing the deformation and displacement of the printing paper.

[0029] When the printer is running, the printing mechanism 100 is driven to move by the carriage. Since the printing mechanism 100 is provided with a first paper pressing roller 410 and a second paper pressing roller 420 which are spaced apart, the first paper pressing roller 410 and the second paper pressing roller 420 press the printing paper at the same time, which can effectively press and smooth the printing paper. Especially when printing to the last position, the first paper pressing roller 410 and the second paper pressing roller 420 are used to press the printing paper to prevent the printing paper from bending, deformation, displacement and other problems, thereby greatly reducing the probability of dirty paper or staining, and helping to improve the printing quality.

[0030] It is understandable that, referring to Figure 3 In some embodiments of the first aspect of the present invention, the printing mechanism 100 has a first paper pressing roller 410 and a second paper pressing roller 420, and the first paper pressing roller 410 and the second paper pressing roller 420 are distributed on both sides of the guide component 310. When the printing mechanism 100 moves to print, the first paper pressing roller 410 and the second paper pressing roller 420 press the printing paper on both sides of the guide component 310, so that the printing paper corresponding to the needle print head 220 is flat, which helps to improve the printing quality and improve the paper staining or staining.

[0031] It is understandable that in other embodiments of the first aspect of the present invention, the printing mechanism 100 may also be provided with a first paper pressing roller 410 and multiple second paper pressing rollers 420, the first paper pressing roller 410 is arranged on one side of the guide component 310, and the multiple second paper pressing rollers 420 are arranged on the periphery of the guide component 310 and away from the side of the first paper pressing roller 410.

[0032] For example, two second paper pressing rollers 420 are used, and the two second paper pressing rollers 420 are distributed at both ends of the guide component 310 and are located on a side away from the first paper pressing roller 410; or, the two second paper pressing rollers 420 are distributed on the other side of the guide component 310 and are arranged in a single row or two rows; or, one second paper pressing roller 420 is distributed on the other side of the guide component 310, and the other second paper pressing roller 420 is distributed at one end of the guide component 310, forming three paper pressings. Of course, the printing mechanism 100 can also be provided with three second paper pressing rollers 420 or more second paper pressing rollers 420.

[0033] With the above structure, during the printing process of the printing mechanism 100 moving, a first paper pressing roller 410 and a plurality of second paper pressing rollers 420 press the printing paper on both sides of the guide component 310, so that the printing paper corresponding to the needle print head 220 is flat, which helps to improve the printing quality and reduce paper stains or stains.

[0034] Reference Figure 3 In some embodiments of the first aspect of the present invention, the guide component 310 includes two baffles, which are arranged on both sides of the axis of the first paper pressing roller 410, and a gap is formed between the two baffles to expose the pin-type printing head 220, so that the printing pin of the pin-type printing head 220 can pass through, thereby performing a printing operation. The side of the baffle facing away from the pin-type printing head 220 is a curved surface, which reduces the contact area between the baffle and the printing paper, reduces the friction resistance of relative movement, and is conducive to the movement of the printing mechanism 100. It should be understood that the guide component 310 can be set as a baffle and contact the printing paper, and the baffle can help press the printing paper, cooperate with the first paper pressing roller 410 and the second paper pressing roller 420, so that the printing paper is printed in a flatter state; the guide component 310 can also be set as a baffle, but not contact the printing paper, to reduce the movement resistance of the printing mechanism 100, and the two baffles can prevent the bending and arching of the printing paper.

[0035] Reference Figure 3 In some embodiments of the first aspect of the present invention, on a plane perpendicular to the axial direction of the first paper pressing roller 410, the first paper pressing roller 410 can cover the gap between the pin print head 220 and the two baffles, that is, the outer diameter of the first paper pressing roller 410 is larger than the space surrounded by the two baffles. The first paper pressing roller 410 can play a blocking and protective role, preventing debris from entering the gap between the pin print head 220 and the two baffles, thereby protecting the pin print head 220.

[0036] When the first paper pressing roller 410 and the second paper pressing roller 420 are distributed on both sides of the guide component 310, the second paper pressing roller 420 is also configured to cover the gap between the pin print head 220 and the two baffles. The second paper pressing roller 420 can also play a blocking and protective role, preventing debris from entering the gap between the pin print head 220 and the two baffles, thereby protecting the pin print head 220.

[0037] Reference Figure 1 and Figure 2 In some embodiments of the first aspect of the present invention, a latch 320 and a buckle portion 330 are provided at the upper end of the ribbon guide 300, and latches 320 are provided on both sides of the ribbon guide 300. In order to facilitate the assembly of the ribbon guide 300 to the base 210, a slot 211 and a card slot are provided on the base 210. The latch 320 is inserted into the slot 211 for easy alignment and positioning, and the buckle portion 330 is clamped in the card slot to fix the ribbon guide 300 to the base 210, which is convenient to install and accurate in positioning.

[0038] It can be understood that the base 210 is connected to the carriage frame 500, and the carriage frame 500 is provided with two support arms 510, and the two support arms 510 are distributed on both sides of the base 210, and a positioning groove 511 is provided on the side of the support arm 510, wherein an L-shaped support plate is provided on the side of the support arm 510, and the positioning groove 511 is formed between the support plate and the side of the support arm 510, or a groove is provided on the side of the support arm 510 to form the positioning groove 511, and a positioning plug 340 is provided at the upper end of the ribbon guide 300, and the positioning plug 340 is inserted into the positioning groove 511 to help limit the carriage frame 500 and prevent the carriage frame 500 from shifting in the horizontal direction.

[0039] Reference Figure 2 In some embodiments of the first aspect of the present invention, the base 210 is connected to a sensor fixing plate 230, and a paper width sensor 240 is installed on the sensor fixing plate 230. The paper width sensor 240 faces downward to detect the width of the printing paper, and controls the moving range of the printing mechanism 100 for printing papers of different widths.

[0040] The second aspect of the present invention provides a dot matrix printer, including the printing mechanism 100 of the first aspect of the embodiment, the printing mechanism 100 includes a print head assembly 200, a ribbon guide 300, a first paper pressing roller 410 and a second paper pressing roller 420, the print head assembly 200 includes a base 210 and a dot matrix print head 220, the dot matrix print head 220 is installed on the lower side of the base 210, the ribbon guide 300 is connected to the base 210, and a guide component 310 is provided at the lower end of the ribbon guide 300 to guide the ribbon, and the guide component 310 is located below the dot matrix print head 220, so that the ribbon passes below the dot matrix print head 220 with accurate positioning, which is conducive to obtaining clear and accurate printed patterns. Among them, the first paper pressing roller 410 and the second paper pressing roller 420 are both rotatably connected to the base 210, and the axial direction of the second paper pressing roller 420 is parallel to the axial direction of the first paper pressing roller 410. Along the axial direction of the second paper pressing roller 420, the first paper pressing roller 410 is arranged on one side of the guide component 310, and the second paper pressing roller 420 and the first paper pressing roller 410 are arranged at an interval, so that the second paper pressing roller 420 and the first paper pressing roller 410 have a certain interval distance. The second paper pressing roller 420 and the first paper pressing roller 410 are pressed at different positions of the printing paper to form two paper pressings, thereby reducing the deformation and displacement of the printing paper.

[0041] When the printer is running, the printing mechanism 100 is driven to move by the carriage. Since the printing mechanism 100 is provided with a first paper pressing roller 410 and a second paper pressing roller 420 which are spaced apart, the first paper pressing roller 410 and the second paper pressing roller 420 press the printing paper at the same time, which can effectively press and smooth the printing paper. Especially when printing to the last position, the first paper pressing roller 410 and the second paper pressing roller 420 are used to press the printing paper to prevent the printing paper from bending, deformation, displacement and other problems, thereby greatly reducing the probability of dirty paper or staining, and helping to improve the printing quality.

[0042] The third aspect of the present invention provides a method for improving the printing of the last dirty paper, which is applied to the dot matrix printer of the second aspect of the present invention, referring to Figure 4 , wherein the dot matrix printer has a paper feeding channel 600, and the dot matrix printer is provided with a paper detection sensor 610, and along the paper output direction of the paper feeding channel 600, the paper detection sensor 610 is located downstream of the printing mechanism 100; The printing method comprises the following steps: S100, when the paper detection sensor 610 does not detect the printing paper, it indicates that the current printing position of the printing paper is not the last position, and the dot matrix printer adopts bidirectional printing and prints normally; S200, when the paper detection sensor 610 detects the printing paper, it indicates that the current printing position of the printing paper is the last position. The dot matrix printer adopts one-way printing, and the printing speed decreases, which is conducive to the printing mechanism 100 to flatten the printing paper, greatly reducing the probability of dirty paper or staining, and helping to improve the printing quality of the last position of the printing paper. In addition, the printing mechanism 100 is provided with a first paper pressing roller 410 and a second paper pressing roller 420 distributed at intervals. The first paper pressing roller 410 and the second paper pressing roller 420 press the printing paper at the same time, which can effectively press the printing paper and smooth the printing paper, especially when printing to the last position, the first paper pressing roller 410 and the second paper pressing roller 420 are used to press the printing paper to prevent the printing paper from bending, deformation, displacement and other problems, which helps to improve the printing quality.

[0043] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A printing mechanism, characterized in that: include: A print head assembly, the print head assembly comprising a base and a pin-type print head, the pin-type print head being mounted on the lower side of the base; A ribbon guide frame connected to the base, wherein a guide component is provided at the lower end of the ribbon guide frame to guide the ribbon, and the guide component is located below the pin-type printing head; A first paper pressing roller, rotatably connected to the base, wherein the first paper pressing roller is arranged on one side of the guide component; The second paper pressing roller is rotatably connected to the base, the axial direction of the second paper pressing roller is parallel to the axial direction of the first paper pressing roller, and the second paper pressing roller and the first paper pressing roller are arranged at an interval along the axial direction of the second paper pressing roller.

2. The printing mechanism according to claim 1, characterized in that: The second paper pressing roller and the first paper pressing roller are distributed on both sides of the guide component.

3. The printing mechanism according to claim 1, characterized in that: The printing mechanism is provided with a plurality of the second paper pressing rollers, and the second paper pressing rollers are arranged around the guide component and away from one side of the first paper pressing roller.

4. The printing mechanism according to claim 1, characterized in that: The guide component includes two baffles, which are arranged on both sides of the axis of the first paper pressing roller, and a gap is formed between the two baffles to expose the pin-type print head. The side of the baffle facing away from the pin-type print head is a curved surface.

5. The printing mechanism according to claim 4, characterized in that: Along the axial direction of the first paper pressing roller, the first paper pressing roller covers the gap between the needle-type printing head and the two blocking sheets.

6. The printing mechanism according to claim 1, characterized in that: The upper end of the ribbon guide is provided with a latch and a buckle part, the two sides of the ribbon guide are provided with the latch, the base is provided with a slot and a card slot, the latch is inserted in the slot, and the buckle part is carded in the card slot.

7. The printing mechanism according to claim 6, characterized in that: The base is connected to a carriage frame, which is provided with two arms, which are distributed on both sides of the base, and the sides of the arms are provided with positioning grooves. The upper end of the ribbon guide is provided with a positioning insert, which is inserted into the positioning groove.

8. The printing mechanism according to claim 1, characterized in that: The base is connected with a sensor fixing plate, and a paper width sensor is installed on the sensor fixing plate. The paper width sensor faces downward to detect the width of the printing paper.

9. A dot matrix printer, characterized in that: The invention comprises a printing mechanism as claimed in any one of claims 1 to 8.

10. A printing method for improving the last dirty paper, applied to the dot matrix printer as claimed in claim 9, characterized in that: The dot matrix printer has a paper feeding channel, and the dot matrix printer is provided with a paper detection sensor, and along the paper output direction of the paper feeding channel, the paper detection sensor is located downstream of the printing mechanism; The printing method comprises the following steps: S100, when the paper detection sensor does not detect the printing paper, the dot matrix printer adopts bidirectional printing; S200: When the paper detection sensor detects printing paper, the dot matrix printer adopts unidirectional printing.

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