Needle printer capable of automatically adjusting printing strength and suitable for printing paper with different thicknesses

Abstract

The utility model discloses a needle printer suitable for automatically adjusting printing strength of printing paper with different thicknesses, which relates to the technical field of printers and comprises a shell, a front guard plate is rotatably mounted on the front side of the shell, an operation panel is mounted on the upper surface of the shell, and a measuring unit, a control assembly and a lifting unit are mounted in the shell. The lifting unit is provided with a displacement driving assembly, and the displacement driving assembly is provided with a printing needle and a ribbon assembly. The printer has the beneficial effects that the thickness of paper is detected through the resistance change of the slide rheostat and the distance measuring sensor, the height of the printing needle is adjusted through the motor, the screw and the sliding block, the printing strength is adjusted, the printer can automatically adjust the printing strength according to the thicknesses of different pieces of paper, manual adjustment is not needed, and the printing efficiency is improved. Operation is simplified, printing efficiency is improved, unclear printing or paper breakage is avoided, printing quality is guaranteed, and paper waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a dot-matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses. Background Art

[0002] Dot matrix printers are a special type of printer, which is very different from inkjet and laser printers. This difference of dot matrix printers cannot be replaced by other types of printers. Because of this, dot matrix printers have always had their own unique market share and serve some special industry users. Dot matrix printers are pressure-sensitive. The needle in the print head hits the carbon paper. When printing, the print needle pops out and prints the ribbon color onto the paper. During the printing process, the needle will keep applying pressure to the paper, so that multiple layers of carbon paper can print the same effect.

[0003] By comparing with the existing technologies in the related fields, it can be seen that the existing dot matrix printers need to manually adjust the printing force according to the thickness of the printed paper during printing, which increases the complexity of the operation. When the staff forgets to adjust, the printing will be unclear or broken, resulting in waste of paper. Utility Model Content

[0004] The utility model aims to solve the above problems and provide a dot matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A dot matrix printer for automatically adjusting the printing force for printing papers of different thicknesses comprises a housing, a front guard plate is rotatably mounted on the front side of the housing, an operation panel is mounted on the upper surface of the housing, a measuring unit, a control component and a lifting unit are mounted in the housing, a displacement drive component is mounted on the lifting unit, a printing needle and a ribbon component are mounted on the displacement drive component, the operation panel, the displacement drive component, the printing needle, the ribbon component and the control component are electrically connected, the operation panel, the displacement drive component, the printing needle, the ribbon component and the control component work by adopting the existing technology, the front end of the housing is closed by the front guard plate, the thickness of the paper is detected by the measuring unit, the height of the displacement drive component and the printing needle is adjusted by the lifting unit according to the thickness of the paper, so as to adjust the printing force during printing, and the paper is printed by the cooperation of the displacement drive component, the printing needle and the ribbon component;

[0007] The measuring unit comprises a support rod and a first sliding rod, the support rods are arranged on both sides of the interior of the shell, a mounting box is installed in the middle position of the two support rods, a sliding rheostat is installed in the mounting box, the first sliding rod is slidably installed on the mounting box, a top plate is installed on the part of the first sliding rod located in the mounting box, a ejector pin is installed on the top plate, the ejector pin is connected to the sliding piece of the sliding rheostat, a mounting frame is installed at the lower end of the first sliding rod, an electric roller is rotatably installed on the mounting frame, a roller is installed on the electric roller, the electric roller, the sliding rheostat and the control component are electrically connected, the electric roller and the sliding rheostat work by adopting the existing technology, under the action of the gravity of the top plate, the ejector pin, the mounting frame, the roller and the electric roller, the roller can be attached to the paper, when the roller is pressed on the paper, the roller drives the ejector pin to move through the mounting frame, the first sliding rod and the top plate, adjusts the sliding piece position of the sliding rheostat through the ejector pin, and completes the detection of the paper thickness through the change of the resistance value of the sliding rheostat, thereby adjusting the height of the printing needle according to the thickness of the paper.

[0008] Furthermore, the first slide bar is square, and the square design is used to limit the first slide bar, thereby effectively preventing the first slide bar from rotating.

[0009] Furthermore, the front guard plate is a transparent plate, which makes it easy to check the working status of the printer in the shell.

[0010] Furthermore, the lifting unit includes a motor, which is installed on both sides of the shell. Screws are installed on the output shafts of the two motors, and sliders are threaded on the screws. The two sliders are respectively connected to the two sides of the displacement drive assembly. The motor and the control assembly are electrically connected. The motor works using existing technology. The motor adjusts the height of the displacement drive assembly and the printing needle through the screw and the slider.

[0011] Furthermore, a fixing unit is provided on the shell, and the fixing unit includes a storage groove, a second slide bar and a positioning groove. The storage groove is provided above the shell, and the second slide bar is slidably installed on the shell. A handle and a positioning block are respectively installed at both ends of the second slide bar. A spring is sleeved on the part of the second slide bar located in the storage groove, and the two ends of the spring are respectively connected to the shell and the positioning block. The positioning groove is provided on the front guard plate, and the positioning groove is slidably connected to the positioning block. The positioning block is slidably installed in the positioning groove through the spring, thereby fixing the front guard plate on the shell.

[0012] Furthermore, a distance measuring sensor is vertically mounted on the printing needle, the distance measuring sensor is electrically connected to the control component, the distance measuring sensor works using existing technology, and the distance between the printing needle and the paper is measured by the distance measuring sensor.

[0013] Furthermore, a horizontal sensor is installed on the upper surface of the middle position of the displacement drive assembly. The horizontal sensor and the control assembly are electrically connected. The horizontal sensor works using existing technology and the horizontal state of the displacement drive assembly is monitored by the horizontal sensor.

[0014] The beneficial effects compared with the prior art are as follows:

[0015] 1. The roller is attached to the paper, and the roller adjusts the resistance of the sliding rheostat through the mounting frame, the first sliding rod, the top plate and the top pin. The resistance of the sliding rheostat changes, so as to complete the detection of paper thickness. The thickness of the paper is detected again by the distance sensor to ensure the accuracy of paper thickness detection. According to the thickness of the paper, the height of the print needle is adjusted by the motor, the screw and the slider. The printing force is adjusted by adjusting the height of the print needle, so that the printer can automatically adjust the printing force according to the thickness of different papers, without manual adjustment, simplifying the operation, improving the printing efficiency, avoiding unclear printing or paper breakage, ensuring the printing quality, and avoiding waste of paper.

[0016] 2. The front guard plate is fixed to the housing through the storage slot, the second slide bar, the spring, the positioning block and the positioning slot to improve the stability and firmness of the front guard plate, avoid the front guard plate from being opened by mistake during printing, and affect the printing process, thereby ensuring the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of a dot matrix printer for automatically adjusting the printing force for printing papers of different thicknesses according to the utility model;

[0019] Figure 2 The utility model is a dot-matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses. Figure 1 The enlarged structural diagram at A in the middle;

[0020] Figure 3 The utility model is a dot-matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses. Figure 1 The enlarged structural diagram at B in the middle;

[0021] Figure 4It is a schematic cross-sectional structure diagram of an installation box of a dot matrix printer for automatically adjusting the printing force for printing papers of different thicknesses according to the utility model;

[0022] Figure 5 It is a schematic diagram of the connection structure of the mounting frame and roller of the dot matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses according to the utility model;

[0023] Figure 6 It is a schematic diagram of the overall structure of the dot matrix printer for automatically adjusting the printing force for printing papers of different thicknesses according to the utility model;

[0024] Figure 7 The utility model is a partial cross-sectional structural schematic diagram of a dot matrix printer which is suitable for automatically adjusting the printing force of printing papers with different thicknesses.

[0025] The following are the descriptions of the reference numerals:

[0026] 1. Shell; 2. Front guard plate; 3. Measuring unit; 31. Support rod; 32. Mounting box; 33. Sliding rheostat; 34. Ejector pin; 35. Ejector plate; 36. First slide bar; 37. Mounting frame; 38. Roller; 39. Electric roller; 4. Fixing unit; 41. Storage slot; 42. Second slide bar; 43. Handle; 44. Spring; 45. Positioning block; 46. Positioning slot; 5. Lifting unit; 51. Motor; 52. Screw; 53. Slider; 6. Control assembly; 7. Operation panel; 8. Displacement drive assembly; 9. Print needle; 10. Distance sensor; 11. Level sensor; 12. Ribbon assembly. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 7 As shown, a dot matrix printer suitable for automatically adjusting the printing force of printing papers of different thicknesses comprises a housing 1, a front guard plate 2 is rotatably mounted on the front side of the housing 1, an operation panel 7 is mounted on the upper surface of the housing 1, a measuring unit 3, a control component 6 and a lifting unit 5 are mounted in the housing 1, a displacement drive component 8 is mounted on the lifting unit 5, a printing needle 9 and a ribbon component 12 are mounted on the displacement drive component 8, the operation panel 7, the displacement drive component 8, the printing needle 9, the ribbon component 12 and the control component 6 are electrically connected, and the operation panel 7, the displacement drive component 8, the printing needle 9, the ribbon component 12 and the control component 6 work using existing technologies, such as Figure 1 , Figure 6As shown, the front end of the housing 1 is closed by the front guard plate 2, the thickness of the paper is detected by the measuring unit 3, and the height of the displacement drive component 8 and the printing needle 9 is adjusted by the lifting unit 5 according to the thickness of the paper. By adjusting the height of the printing needle 9, the printing force during printing is automatically adjusted to ensure the quality of printing, and the paper is printed by the cooperation of the displacement drive component 8, the printing needle 9, and the ribbon component 12;

[0028] The measuring unit 3 includes a support rod 31 and a first slide rod 36. The support rod 31 is arranged on both sides of the interior of the housing 1. A mounting box 32 is installed in the middle position of the two support rods 31. A sliding rheostat 33 is installed in the mounting box 32. The first slide rod 36 is slidably installed on the mounting box 32. A top plate 35 is installed on the part of the first slide rod 36 located in the mounting box 32. A top pin 34 is installed on the top plate 35. The top pin 34 is connected to the sliding piece of the sliding rheostat 33. A mounting frame 37 is installed at the lower end of the first slide rod 36. An electric roller 39 is rotatably installed on the mounting frame 37. A roller 38 is installed on the electric roller 39. The electric roller 39, the sliding rheostat 33 and the control component 6 are electrically connected. The electric roller 39 and the sliding rheostat 33 work using existing technologies, such as Figure 1 , Figure 4 , Figure 5 As shown, under the action of gravity of the top plate 35, the ejector pin 34, the mounting frame 37, the roller 38 and the electric roller 39, the roller 38 can be attached to the paper, and the electric roller 39 drives the roller 38 to push the paper, effectively avoiding the roller 38 from affecting the feeding of the paper. When the roller 38 is pressed on the paper, the height of the roller 38 changes, and the roller 38 drives the ejector pin 34 to move through the mounting frame 37, the first slide bar 36 and the top plate 35, and drives the sliding piece of the sliding rheostat 33 to move through the ejector pin 34, thereby adjusting the resistance value of the sliding rheostat 33. The resistance value of the sliding rheostat 33 changes, thereby completing the detection of the paper thickness, so that the printer can automatically adjust the height of the printing needle 9 according to the thickness of different papers, without the need for manual adjustment by the staff, effectively improving the printing efficiency.

[0029] The first slide bar 36 is square. Figure 4 , Figure 5 As shown, the square design is used to limit the first slide bar 36, thereby effectively preventing the first slide bar 36 from rotating.

[0030] The front guard plate 2 is a transparent plate, such as Figure 6 As shown, a transparent plate is used to facilitate viewing of the working status of the printer in the housing 1 .

[0031] The lifting unit 5 includes a motor 51, which is installed on both sides of the housing 1. Screws 52 are installed on the output shafts of the two motors 51. Slide blocks 53 are threadedly connected to the screws 52. The two slide blocks 53 are respectively connected to both sides of the displacement drive assembly 8. The motor 51 is electrically connected to the control assembly 6. The motor 51 works using existing technologies, such as Figure 1 , Figure 3 As shown, after the thickness of the paper is determined, the motor 51 drives the screw 52 to rotate, and the screw 52 adjusts the height of the displacement drive assembly 8 and the print needle 9 through the slider 53. By adjusting the height of the print needle 9, the print needle 9 can adjust the printing force according to the thickness of different papers, thereby ensuring the quality of printing, effectively avoiding unclear printing or paper breakage, and avoiding waste of paper.

[0032] The housing 1 is provided with a fixing unit 4, which includes a receiving groove 41, a second slide bar 42 and a positioning groove 46. The receiving groove 41 is provided above the housing 1, the second slide bar 42 is slidably installed on the housing 1, and a handle 43 and a positioning block 45 are respectively installed at both ends of the second slide bar 42. A spring 44 is sleeved on the portion of the second slide bar 42 located in the receiving groove 41, and the two ends of the spring 44 are respectively connected to the housing 1 and the positioning block 45. The positioning groove 46 is provided on the front guard plate 2, and the positioning groove 46 is slidably connected to the positioning block 45. Figure 6 , Figure 7 As shown, when the front guard plate 2 is closed to the shell body 1, the positions of the storage groove 41 and the positioning groove 46 correspond to each other. Under the elastic force of the spring 44, the positioning block 45 is slidably installed in the positioning groove 46 through the spring 44, so that the front guard plate 2 is fixed on the shell body 1, improving the stability and firmness of the front guard plate 2, avoiding the accidental opening of the front guard plate 2 during the printing process, which affects the printing process. When the front guard plate 2 needs to be opened, the handle 43 drives the second slide bar 42 and the positioning block 45 to move, so that the positioning block 45 disengages from the positioning groove 46, releases the fixation of the front guard plate 2, and the front guard plate 2 can be opened.

[0033] A distance sensor 10 is vertically mounted on the print needle 9. The distance sensor 10 is electrically connected to the control component 6. The distance sensor 10 works using existing technology, such as Figure 1 , Figure 2 As shown, the distance sensor 10 is driven to move by the printing needle 9, and the distance between the printing needle 9 and the paper is measured by the distance sensor 10, thereby ensuring the accuracy of the height adjustment of the printing needle 9 to the paper and ensuring the accuracy of the printing force when the printing needle 9 prints.

[0034] A level sensor 11 is installed on the upper surface of the middle position of the displacement drive assembly 8. The level sensor 11 is electrically connected to the control assembly 6. The level sensor 11 works using existing technology, such as Figure 1 , Figure 3 As shown, the displacement driving assembly 8 drives the horizontal sensor 11 to move, and the horizontal state of the displacement driving assembly 8 is monitored by the horizontal sensor 11, so that the displacement driving assembly 8 maintains a horizontal state when it is raised or lowered, avoiding tilting that affects the printing quality.

[0035] Working principle: Figure 6 , Figure 7 As shown, the housing 1 is closed by the front guard plate 2, and under the elastic force of the spring 44, the positioning block 45 is slidably installed in the positioning groove 46 through the spring 44, thereby fixing the front guard plate 2 on the housing 1;

[0036] Place the paper to be printed into the printer. Figure 1 , Figure 4 , Figure 5 As shown, the electric roller 39 drives the roller 38 to push the paper, so that the roller 38 moves to the top of the paper, and under the gravity of the top plate 35, the ejector pin 34, the mounting frame 37, the roller 38, and the electric roller 39, the roller 38 can be attached to the paper; when the roller 38 is pressed on the paper, the height of the roller 38 changes, and the roller 38 drives the ejector pin 34 to move through the mounting frame 37, the first slide bar 36, and the top plate 35, and drives the sliding piece of the sliding rheostat 33 to move through the ejector pin 34, so as to adjust the resistance value of the sliding rheostat 33, and the thickness of the paper is detected by changing the resistance value of the sliding rheostat 33;

[0037] Depending on the thickness of the paper, such as Figure 1 , Figure 3 As shown, the motor 51 drives the screw 52 to rotate, and the screw 52 adjusts the height of the displacement drive assembly 8 and the printing needle 9 through the slider 53. By adjusting the height of the printing needle 9, the force during printing is adjusted;

[0038] like Figure 1 , Figure 3 As shown, the displacement drive assembly 8 drives the horizontal sensor 11 to move, and the horizontal state of the displacement drive assembly 8 after lifting and lowering is monitored by the horizontal sensor 11; Figure 1 , Figure 2 As shown, the distance sensor 10 is driven to move by the printing needle 9, and the distance between the printing needle 9 and the paper is measured by the distance sensor 10, so as to ensure the accuracy of the height adjustment of the printing needle 9 to the paper and ensure the accuracy of the printing force of the printing needle 9 when printing;

[0039] like Figure 1 , Figure 6 As shown, the paper is printed by the cooperation of the displacement drive assembly 8, the printing needle 9, and the ribbon assembly 12;

[0040] When you need to inspect the inside of the printer, such as Figure 6 , Figure 7 As shown, the handle 43 drives the second slide bar 42 and the positioning block 45 to move, so that the positioning block 45 is disengaged from the positioning slot 46, and the front guard plate 2 is released from being fixed, so that the front guard plate 2 can be opened to inspect the inside of the printer.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A dot matrix printer that can automatically adjust the printing force for printing papers of different thicknesses, characterized in that: The invention comprises a housing (1), a front guard plate (2) being rotatably mounted on the front side of the housing (1), an operation panel (7) being mounted on the upper surface of the housing (1), a measuring unit (3), a control component (6) and a lifting unit (5) being mounted inside the housing (1), a displacement drive component (8) being mounted on the lifting unit (5), and a printing needle (9) and a ribbon component (12) being mounted on the displacement drive component (8); The measuring unit (3) comprises a support rod (31) and a first sliding rod (36). The support rod (31) is arranged on both sides of the interior of the housing (1). A mounting box (32) is installed in the middle of the two support rods (31). A sliding rheostat (33) is installed in the mounting box (32). The first sliding rod (36) is slidably installed on the mounting box (32). A top plate (35) is installed on the portion of the first sliding rod (36) located in the mounting box (32). A top pin (34) is installed on the top plate (35). The top pin (34) is connected to a sliding sheet of the sliding rheostat (33). A mounting frame (37) is installed at the lower end of the first sliding rod (36). An electric roller (39) is rotatably installed on the mounting frame (37). A roller (38) is installed on the electric roller (39).

2. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: The first sliding bar (36) is square.

3. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: The front guard plate (2) is a transparent plate.

4. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: The lifting unit (5) comprises a motor (51), the motor (51) being mounted on both sides of the interior of the housing (1), screws (52) being mounted on the output shafts of the two motors (51), sliders (53) being threadedly connected to the screws (52), and the two sliders (53) being respectively connected to both sides of the displacement drive assembly (8).

5. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: The shell (1) is provided with a fixing unit (4), and the fixing unit (4) comprises a receiving groove (41), a second slide bar (42) and a positioning groove (46). The receiving groove (41) is provided above the shell (1), and the second slide bar (42) is slidably mounted on the shell (1). A handle (43) and a positioning block (45) are respectively mounted at both ends of the second slide bar (42). A spring (44) is sleeved on the portion of the second slide bar (42) located in the receiving groove (41), and the two ends of the spring (44) are respectively connected to the shell (1) and the positioning block (45). The positioning groove (46) is provided on the front guard plate (2), and the positioning groove (46) is slidably connected to the positioning block (45).

6. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: A distance measuring sensor (10) is vertically mounted on the printing needle head (9).

7. The dot matrix printer capable of automatically adjusting the printing force for printing papers of different thicknesses according to claim 1, characterized in that: A level sensor (11) is installed on the upper surface of the middle position of the displacement drive component (8).

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