Needle type printing head

Abstract

The utility model relates to a needle type printing head, which comprises a printing head base, a needle guide plate, a roller and a colored tape separation blade, the needle guide plate is fixed on the lower end face of the printing head base, a needle guide hole for guiding a printing needle is arranged on the needle guide plate, the roller and the colored tape separation blade are arranged on two opposite sides of the printing head base, and the printing head base is provided with a needle guide hole for guiding the printing needle. A sensor used for detecting the printing medium is arranged on the side, away from the printing head base, of the colored tape blocking piece and installed on the printing head base. The printing head is reasonable in design, the idler wheels and the colored tape blocking pieces are arranged on the two opposite sides of the printing head base, movement of the colored tape towards the two side edges is limited together, the colored tape can be well guided, and the colored tape is effectively prevented from being clamped, broken and the like; and meanwhile, the colored tape separation blade also limits the movement of the colored tape towards the direction of the sensor, so that the sensor is ensured to have a good working environment.

Description

Technical Field

[0001] This utility model relates to a dot-matrix printhead. Background Technology

[0002] During use, dot matrix printheads can experience malfunctions such as broken print needles, ribbon jamming, and ribbon drift. These issues not only affect user efficiency but also increase maintenance and operating costs. Printhead clogging occurs when the ribbon is not properly guided within the printing area, causing it to deviate and become fuzzy. This allows ribbon fibers and ink to enter the printhead, leading to blockages. In mild cases, this can cause broken print needles; in severe cases, it can prevent the printhead from ejecting needles, resulting in printhead damage or even burning out the printhead drive circuit.

[0003] Dot matrix printers often encounter printing media of various widths during use. The printer may not be able to effectively recognize the boundaries and width of the printing media. Current methods involve placing the printing media in a fixed position, which is inconvenient. Furthermore, some special media have holes that the printer cannot recognize, leading to printing position errors.

[0004] Although dot matrix printers have lower operating costs, the noise they generate significantly impacts the office environment, which is a major reason for declining market demand. Therefore, improvements are necessary. Utility Model Content

[0005] This utility model addresses the problems existing in the prior art by providing a dot-matrix printhead.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a dot-matrix printhead, comprising a printhead base, a needle guide plate, a roller, and a ribbon baffle. The needle guide plate is fixed to the lower end face of the printhead base, and the needle guide plate is provided with a needle guide hole for guiding the printing needle. The roller and the ribbon baffle are installed on opposite sides of the printhead base. A sensor for detecting the printing medium is provided on the side of the ribbon baffle away from the printhead base, and the sensor is installed on the printhead base.

[0007] Furthermore, the ribbon baffle is located on the side of the lowest end of the printhead base.

[0008] Furthermore, the ribbon baffle and sensor are fixed to the printhead base with screws.

[0009] Furthermore, the sensor is located in the middle of the side of the printhead base and can rotate with the printhead.

[0010] Furthermore, the roller is rotatably mounted on the side of the printhead base.

[0011] Furthermore, the lower end of the roller extends below the lower end face of the printhead base, so that there is a flying needle distance between the printhead needle outlet surface and the printing medium.

[0012] Furthermore, the needle guide holes on the needle guide plate are arranged in a diamond pattern.

[0013] Furthermore, the sensor is a reflective photoelectric sensor.

[0014] Furthermore, the sensor head has a transmitter for emitting a downward beam of light and a receiver for receiving a reflected beam of light, both of which are located at the lower end of the sensor.

[0015] Furthermore, the axis of the roller is horizontally positioned.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed. By setting rollers and ribbon baffles on opposite sides of the printhead base, the movement of the ribbon in both lateral directions is restricted, which can play a good guiding role for the ribbon and effectively prevent ribbon jamming, ribbon breakage and other faults. At the same time, the ribbon baffles also restrict the movement of the ribbon in the direction of the sensor, ensuring that the sensor has a good working environment. Attached Figure Description

[0017] Figure 1 This is a side view of an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 1 ;

[0019] Figure 3 This is a three-dimensional structural diagram of an embodiment of the present utility model. Figure 2 ;

[0020] Figure 4 This is a bottom view of the structure of an embodiment of the present invention.

[0021] In the picture:

[0022] 1-Printhead base; 2-Roller; 3-Needle guide plate; 4-Ribbon baffle; 5-Sensor; 6-Screw; 7-Needle guide hole. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1-4 As shown, this utility model discloses a dot-matrix printhead, including a printhead base 1, a needle guide plate 3, rollers 2, and a ribbon baffle 4. The needle guide plate 3 is fixed to the lower end face of the printhead base 1, located at the lowest end of the printhead. The needle guide plate 3 has needle guide holes 7 for guiding the printing needles. The rollers 2 and the ribbon baffle 4 are installed on opposite sides of the printhead base 1, and rotate with the printhead. A sensor 5 for detecting the printing medium is installed on the side of the ribbon baffle 4 away from the printhead base 1. The sensor 5 is installed on the printhead base 1 and can rotate with the printhead. By setting rollers and ribbon baffles on opposite sides of the printhead base, the movement of the ribbon in both lateral directions is restricted, effectively guiding the ribbon and preventing ribbon jamming, breakage, and other malfunctions. Simultaneously, the ribbon baffle also restricts the movement of the ribbon towards the sensor, ensuring a good working environment for the sensor.

[0026] In this embodiment, the ribbon baffle 4 is located on the side of the lowest end of the printhead base 1, and the ribbon baffle is vertically arranged. The ribbon baffle can guide the ribbon well, effectively preventing ribbon jamming, ribbon slippage and other malfunctions; it also plays a certain role in protecting the sensor.

[0027] In this embodiment, the ribbon baffle 4 and the sensor 5 are fixed to the side of the printhead base 1 by screws 6.

[0028] In this embodiment, the sensor 5 is located at the center of the side of the printhead base 1. Furthermore, the sensor 5 is a reflective photoelectric sensor. The sensor head has an emitter for emitting a downward-facing light beam and a receiver for receiving the reflected light beam. Both the emitter and receiver are located at the lower end of the sensor. The sensor works as follows: during operation, the emitter emits a light beam, which illuminates the surface of the medium in front of the sensor. The medium surface diffusely reflects the light in all directions, and the receiver at the sensor head receives the light reflected back from the medium surface. When there is no printing medium, the light signal received by the receiver from the background reflection is very weak; when there is printing medium, the light signal received by the receiver increases significantly. The sensor determines the presence or absence of printing medium by the intensity of the light signal. The sensor can effectively identify the top, left, and right edges of the printing medium, and can identify the presence or absence of printing medium, as well as special media with perforations.

[0029] In this embodiment, the axis of the roller 2 is horizontally arranged, and the roller 2 is rotatably mounted on the side of the printhead base 1. The lower end of the roller extends below the lower end face of the printhead base, so that there is a flying needle distance between the printhead needle outlet surface and the printing medium. Specifically, the mounting hole of the roller 2 is locked to one side of the printhead base 1 by screws 6, and the mounting position of the roller can be adjusted up and down to adjust the flying needle distance between the printhead needle outlet surface and the printing medium.

[0030] In this embodiment, the needle guide plate 3 is located at the bottom of the print head, and the needle guide holes 7 on the needle guide plate 3 are arranged in a diamond pattern, which can effectively guide the printing needles and reduce printing noise. The diamond arrangement of the printing needles ensures that only one or two needles are emitted at the same time when the needles strike the ribbon to print. This avoids the situation where the printing needles are arranged vertically, and a row of needles may be emitted at the same time when each needle strikes. This also avoids the occurrence of noise peaks, effectively reducing peak energy consumption during printing and effectively reducing printing noise.

[0031] Specific implementation process: Using the printhead base 1, the needle guide plate 3 is attached to the lower end face of the printhead base 1, located at the bottom of the printhead; the roller 2 is fixed to one side of the printhead base 1 with screws, and the ribbon baffle 4 and sensor 5 are fixed to the printhead base 1 on the other side with screws. The sensor 5 is located in the middle of the side of the printhead base 1, and can quickly and effectively determine whether there is printing media under the printhead roller 2 as the printhead moves, identify whether it is a special printing medium with holes, and identify the top, left, and right edges of the printing medium; the ribbon moves continuously in close contact with the needle guide plate 3, and the roller 2 on one side of the printhead base 1 and the ribbon baffle 4 on the other side of the printhead base 1 provide good guidance for the two sides of the ribbon, avoiding ribbon jamming, ribbon slippage, ribbon breakage, and other faults. The needle holes on the needle guide plate 3 are arranged in a diamond pattern, which effectively reduces the noise generated during printing.

[0032] Using the above solution, the printer can automatically identify the boundaries of the printing media and special holes, allowing the printer to transport the printing media at any position and effectively identify special perforated media, significantly improving ease of use. Simultaneously, the ribbon baffle effectively guides the ribbon, preventing ribbon jams, breaks, and other malfunctions, and effectively avoiding ink and ribbon fiber seepage into the print head, which could lead to broken print needles or print head blockage. The diamond-shaped arrangement of the print needles effectively reduces printing noise.

[0033] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0034] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0035] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A needle printing head comprising a printing head base, a needle guide plate, a roller and a ribbon stopper, the needle guide plate is fixed on the lower end surface of the printing head base, and the needle guide plate is provided with a needle guide hole for guiding the printing needle, characterized in that: The rollers and ribbon baffles are mounted on opposite sides of the printhead base. A sensor for detecting the printing medium is provided on the side of the ribbon baffle away from the printhead base. The sensor is mounted on the printhead base.

2. A needle printing head according to claim 1, characterized in that: The ribbon baffle is located on the side of the lowest end of the printhead base.

3. A needle printing head according to claim 1 or 2, characterized in that: The ribbon baffle and sensor are fixed to the printhead base with screws.

4. A needle printing head according to claim 1, characterized in that: The sensor is located in the middle of the side of the printhead base and can rotate with the printhead.

5. A dot-matrix printhead according to claim 1, characterized in that: The roller is rotatably mounted on the side of the printhead base.

6. A needle printing head according to claim 1, characterized in that: The lower end of the roller extends below the lower end face of the printhead base to create a flying needle distance between the printhead needle exit surface and the printing medium.

7. A needle printing head according to claim 1, wherein: The needle guide holes on the needle guide plate are arranged in a diamond pattern.

8. A needle printing head according to claim 1, characterized in that: The sensor is a reflective photoelectric sensor.

9. A needle printing head according to claim 8, characterized in that: The sensor head has a transmitter for emitting a downward beam of light and a receiver for receiving a reflected beam of light, both of which are located at the lower end of the sensor.

10. A needle printing head according to claim 1, characterized in that: The axis of the roller is set horizontally.

Images