Up-and-down parallel moving type print head structure for portable printer

Abstract

The utility model relates to a kind of upper and lower parallel moving type print head structure for portable printer, including mounting plate, the downside of the mounting plate is provided with print head support, the bottom surface of the print head support is installed with print head piece, and the both sides end of print head support is provided with the sliding guide structure for realizing the upper and lower parallel moving of print head support between mounting plate. The print head helps to realize parallel moving in the process of the upper and lower movement of print head piece, guarantees that print head piece and carbon ribbon, label paper are balanced when adhering, improve printing definition.

Description

Technical Field

[0001] This utility model relates to a vertically parallel-moving printhead structure for a portable printer. Background Technology

[0002] The ribbon printhead is a key component of portable printers, and also a fragile and easily damaged device. It is responsible for transferring ink from the ribbon onto labels or paper to achieve information printing. In industrial production, its performance directly affects printing quality and efficiency.

[0003] During the printing process, existing printheads sometimes exhibit uneven rise heights on both sides when pushed by the label paper. This affects the tension between the printhead, the ribbon, and the label paper, resulting in unclear label printing and excessive localized ribbon tension, which can hinder ribbon delivery. Utility Model Content

[0004] The purpose of this invention is to provide a vertically parallel moving printhead structure for portable printers. This printhead helps to achieve parallel movement of the printhead plate during vertical movement, ensuring balanced force when the printhead plate adheres to the ribbon and label paper, thereby improving print clarity.

[0005] The technical solution of this utility model is as follows: a vertically parallel movable printhead structure for a portable printer, including a mounting plate, a printhead support is provided on the lower side of the mounting plate, a printhead plate is mounted on the bottom surface of the printhead support, and sliding guide structures for realizing the vertically parallel movement of the printhead support are provided between the two ends of the printhead support and the mounting plate.

[0006] Furthermore, the sliding guide structure includes guide plates fixed to both ends of the mounting plate. A pair of vertical grooves arranged in the front and back are provided on the front of the guide plates. Side plates located inside the guide plates are fixed to both ends of the print head support. A pair of guide pins extending into the vertical grooves are installed on each side plate.

[0007] Furthermore, a transverse groove is provided on the upper rear side of the guide plate, and a bracket is rotatably connected to the rear of the print head support. Shaft portions extending into the transverse groove are provided on both sides of the rear of the bracket.

[0008] Furthermore, the bracket includes a longitudinal pin rotatably connected to the rear of the printhead support. Both ends of the longitudinal pin are connected to one end of a connecting rod, and a shaft is longitudinally installed between the other ends of the two connecting rods. Both ends of the shaft pass through the connecting rod and extend into the corresponding transverse groove.

[0009] Furthermore, an inverted U-shaped groove with an opening facing downwards is provided at the front of each of the two side plates, and a cover plate is installed between the rear of the two side plates to cover the lower rear of the printhead plate.

[0010] Furthermore, a longitudinally arranged guide roller is rotatably connected between the lower rear sides of the two guide plates.

[0011] Furthermore, an elastic mechanism is provided between the top surface of the printhead support and the mounting plate.

[0012] Furthermore, the elastic mechanism includes a pair of springs, which are longitudinally spaced and installed in mounting slots provided on the printhead support. The bottom surface of the mounting plate is provided with a positioning recess for the upper end of the spring to extend into.

[0013] Furthermore, fasteners are fixed on both sides of the top of the mounting plate, and hooks protruding from the guide plate are provided on the outer ends of the fasteners. The upper part of the guide plate is provided with a notch to avoid the hooks.

[0014] Furthermore, the top surface of the mounting plate is provided with a pair of recesses spaced longitudinally.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The printhead has a compact structure. By setting a pair of vertical slots on the guide plates at both ends of the mounting plate, and setting a pair of guide pins that cooperate with the vertical slots on the side plates at both ends of the printhead support, and by using a bracket that is movably connected between the guide plates and the printhead support, it is possible to achieve parallel movement of the printhead during the up and down movement, ensuring that the part of the printhead in contact with the ribbon is subjected to balanced force during the printing process, and improving print clarity.

[0016] 2. By incorporating an elastic mechanism between the mounting plate and the printhead support, the printhead adapts to the thickness of the label paper during printing, ensuring tension between the printhead plate, the ribbon, and the label paper.

[0017] 3. The mounting plate features snap-fit ​​mechanisms, which facilitate quick installation and removal of the printhead and make it easy to clean the printhead. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the printhead structure of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the printhead structure of this utility model. Figure 2 ; Figure 3 This is an exploded view of the printhead of this utility model; Figure 4This is a schematic diagram of the transverse cross-sectional structure of the print head of this utility model at the spring position; Figure 5 This is a schematic diagram showing the cooperation between the print head and the printing roller of this utility model; Figure 6 This is a schematic diagram showing the connection between the print head and the printer housing of this utility model; In the diagram: 1-Printer housing; 1a-Slot; 1b-Wedge; 2-Printing roller; 10-Mounting plate; 11-Positioning recess; 12-Lower recess; 13-Positioning recess; 20-Print head support; 21-Mounting groove; 30-Print head plate; 31-Blind plate; 40-Guide plate; 41-Vertical groove; 42-Horizontal groove; 43-Notch; 50-Side plate; 51-Guide pin; 52-Inverted U-shaped groove; 61-Longitudinal pin; 62-Connecting rod; 63-Shaft; 70-Guide roller; 80-Spring; 90-Snap fastener; 91-Hook. Detailed Implementation

[0019] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0020] refer to Figures 1 to 6 A vertically parallel-moving printhead structure for a portable printer includes a mounting plate 10. A printhead support 20 is disposed on the lower side of the mounting plate, and a printhead plate 30 is mounted on the bottom surface of the printhead support. Sliding guide structures for realizing the vertical parallel movement of the printhead support are provided between the two ends of the printhead support and the mounting plate. By moving the printhead support vertically, the printhead can be adjusted according to the thickness of the label paper, ensuring that the printhead plate of the printhead is in close contact with the label paper, thus guaranteeing print clarity.

[0021] In this embodiment, the sliding guide structure includes guide plates 40 fixed to both ends of the mounting plate. A pair of vertical grooves 41 arranged front and back are provided on the front part of the guide plate. Side plates 50 located inside the guide plates are fixed to both ends of the print head support with screws. A pair of guide pins 51 protruding outward and extending into the vertical grooves are installed on the upper front part of the outer side of the side plate. The guide pins pass through the side plates and are screwed to the print head support.

[0022] In this embodiment, a horizontal groove 42 is provided on the upper rear side of the guide plate. A bracket is rotatably connected to the rear of the print head support. Shaft portions extending into the horizontal groove are provided on both sides of the rear of the bracket so as to cooperate with the vertical groove and guide pin to enable the print support and print head to move vertically (vertically lift) together, so that the printing lines on the print head can always adhere to the label paper.

[0023] Specifically, the aforementioned support includes a longitudinal pin 61 rotatably connected to the rear of the printhead support. Both ends of the longitudinal pin are connected to one end of a connecting rod 62. A shaft 63 is longitudinally mounted between the other ends of the two connecting rods. Both ends of the shaft pass through the connecting rods and extend into corresponding transverse grooves. The shaft moves within the transverse grooves, and the shaft is rotatably connected to the printhead support via the longitudinal pin and connecting rods. This, combined with the vertical grooves and guide pins, effectively ensures the printhead support moves vertically in parallel (vertical lifting).

[0024] In this embodiment, in order to ensure that the top surface of the printing roller used to convey label paper inside the printer is always tangent to the print head plate, an inverted U-shaped groove 52 with the opening facing downward is provided at the front of the two side plates. The inverted U-shaped groove is fastened to the upper end of the roller shaft, so that the print head plate is always located on the upper side of the roller shaft.

[0025] In this embodiment, a longitudinally arranged metal guide roller 70 is rotatably connected between the lower rear sides of the two guide plates to guide the carbon ribbon and to tension and flatten the carbon ribbon.

[0026] In this embodiment, a cover plate 31 is installed between the rear parts of the two side plates, covering the lower rear part of the printhead plate. The bottom surface of the cover plate is higher than the bottom surface of the guide roller. The cover plate covers the lower rear part of the printhead plate on the one hand, and works with the guide roller to better guide the ribbon to the bottom surface of the printhead plate on the other hand.

[0027] In this embodiment, to enable the printhead to adaptively adjust according to the thickness of the label paper, an elastic mechanism is provided between the top surface of the printhead support and the mounting plate. Specifically, the elastic mechanism includes a pair of springs 80, which are longitudinally spaced and installed in mounting grooves 21 on the upper surfaces of both sides of the printhead support. The bottom surface of the mounting plate is provided with corresponding positioning recesses 11 for the upper ends of the springs to extend into. The mounting grooves and positioning recesses cooperate to position the springs, and the pair of springs ensures balanced force distribution.

[0028] In this embodiment, to facilitate the connection between the printhead and the printer housing and to enable quick assembly and disassembly of the printhead, grooves 13 are provided on both sides of the top of the mounting plate. Plastic clips 90 are fixed to these grooves with screws. Each clip has a hook 91 protruding from the side face of the guide plate at its outer end. A notch 43 is provided on the upper part of the guide plate to avoid the hooks. The printhead is installed by engaging the hooks with the slots 1a on the printer housing 1. Pressing the hooks inward disengages them from the slots, allowing the printhead to detach from the printer housing.

[0029] In this embodiment, to adjust the tension between the print head and the label printing roller according to the thickness of the label paper, a pair of recesses 12 are longitudinally spaced on the top surface of the mounting plate. Two wedges 1b, capable of extending into the recesses, are longitudinally slidably connected to the printer housing. When the wedges move and fall into the recesses, the printer can print label paper with a thickness of 1-1.5 mm; when the wedges do not fall into the recesses, the printer can print label paper with a thickness of 0.2-1 mm; when the wedges do not fall into the recesses, the bottom surface of the wedges abuts against or is close to the top surface of the mounting plate.

[0030] Unless otherwise stated, if any technical solution disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solution of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0031] 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 or 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).

[0032] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0033] 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.

[0034] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A vertically parallel-moving printhead structure for a portable printer, comprising a mounting plate, characterized in that, A printhead support is provided on the lower side of the mounting plate, and a printhead plate is installed on the bottom surface of the printhead support. Sliding guide structures for realizing the vertical parallel movement of the printhead support are provided between the two ends of the printhead support and the mounting plate.

2. The vertically parallel moving printhead structure for a portable printer according to claim 1, characterized in that, The sliding guide structure includes guide plates fixed to both ends of the mounting plate. A pair of vertical grooves arranged in front and back are provided on the front of the guide plates. Side plates located inside the guide plates are fixed to both ends of the print head support. A pair of guide pins extending into the vertical grooves are installed on each side plate.

3. The vertically parallel moving printhead structure for a portable printer according to claim 2, characterized in that, A horizontal groove is provided on the upper rear side of the guide plate, and a bracket is rotatably connected to the rear of the print head support. A shaft portion extending into the horizontal groove is provided on both sides of the rear of the bracket.

4. The vertically parallel moving printhead structure for a portable printer according to claim 3, characterized in that, The bracket includes a longitudinal pin rotatably connected to the rear of the printhead support. Both ends of the longitudinal pin are connected to one end of a connecting rod, and a shaft is longitudinally installed between the other ends of the two connecting rods. Both ends of the shaft pass through the connecting rod and extend into the corresponding transverse groove.

5. The vertically parallel moving printhead structure for a portable printer according to claim 2, characterized in that, The front of each of the two side plates has an inverted U-shaped groove with the opening facing downwards, and a cover plate is installed between the rear of the two side plates to cover the lower rear of the printhead plate.

6. The vertically parallel moving printhead structure for a portable printer according to claim 2, characterized in that, A longitudinally arranged guide roller is rotatably connected between the lower rear sides of the two guide plates.

7. The vertically parallel-moving printhead structure for a portable printer according to claim 1, 2, 3, 4, 5, or 6, characterized in that, An elastic mechanism is provided between the top surface of the printhead support and the mounting plate.

8. The vertically parallel moving printhead structure for a portable printer according to claim 7, characterized in that, The elastic mechanism includes a pair of springs, which are longitudinally spaced and installed in mounting slots provided on the printhead support. The bottom surface of the mounting plate is provided with a positioning recess for the upper end of the spring to extend into.

9. The vertically parallel-moving printhead structure for a portable printer according to claim 2, 3, 4, 5 or 6, characterized in that, Both sides of the top of the mounting plate are fixed with fasteners, and the outer ends of the fasteners are provided with hooks protruding from the guide plate. The upper part of the guide plate is provided with a notch to avoid the hooks.

10. The vertically parallel-moving printhead structure for a portable printer according to claim 1, 2, 3, 4, 5, or 6, characterized in that, The top surface of the mounting plate has a pair of recesses spaced longitudinally.

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