Printer paper thickness detection device and printer adaptive adjustment method

Abstract

The present invention relates to a printer paper thickness detection device and a printer self-adaptive adjustment method, comprising a paper guide assembly and a paper feeding assembly which are sequentially installed on a frame along a paper conveying direction, a paper thickness detection assembly being installed on the frame on the paper feeding assembly, the paper thickness detection assembly comprising a detection shaft and a detection sensor which are installed on the frame at intervals, a detection lever and a detection baffle being installed on the detection shaft, the outer end of the detection lever being connected to the upper end of a pressure sleeve, a large fan-shaped portion and a small fan-shaped portion which are matched with the detection sensor being respectively arranged on the outer periphery of both ends of the detection baffle, a torsion spring being sleeved on the detection shaft, the inner end of the torsion spring being connected to the detection baffle, and the outer end being connected to the frame, the device has a simple structure and a reasonable design, can automatically adjust the distance between a print head and a printing plate through a paper thickness detection signal, avoids poor printing quality or damage to the print head due to inaccurate manual adjustment, improves the use experience, and prolongs the service life of the machine.

Description

Technical Field

[0001] This invention relates to a printer paper thickness detection device and a printer adaptive adjustment method. Background Art

[0002] Currently, printers primarily use infrared reflective measurement, inductive sensor measurement, and mechanical measurement methods to detect paper thickness. The first two methods are affected by the thickness of the paper material and its grayscale, and are typically more complex and expensive. Paper thickness detection can be divided into continuous stepless detection and segmented interval detection. Printer printheads are usually adapted to a certain range of paper thicknesses, so paper thickness detection only needs to measure a specific paper thickness threshold. However, continuous stepless detection often results in most data not being fully utilized, leading to data waste.

[0003] On the other hand, most dot matrix printers currently on the market require manual adjustment of the distance between the print head and the printing plate to accommodate different paper thicknesses. This is inconvenient for users and makes it difficult to accurately adjust the correct distance, resulting in poor print quality and even the risk of damaging the print head. Summary of the Invention

[0004] This invention proposes a printer paper thickness detection device and a printer adaptive adjustment method.

[0005] The solution adopted by the present invention to solve the technical problem is a printer paper thickness detection device, which includes a paper guide assembly and a paper feed assembly installed sequentially on the frame along the paper conveying direction, and a paper thickness detection assembly installed on the paper feed assembly on the frame.

[0006] The paper feeding assembly includes an upper paper feeding wheel and a lower paper feeding wheel that are spaced apart vertically. The shafts at both ends of the upper paper feeding wheel are mounted in the slots on the frame. A pressure sleeve is provided in the slots to cover the shafts of the upper paper feeding wheel from above. The upper end of the pressure sleeve is connected to the frame via a compression spring. An upper gear and a lower gear that mesh with each other are respectively installed on the axle at one end of the upper paper feeding wheel and the lower paper feeding wheel. One of the upper paper feeding wheel and the lower paper feeding wheel is driven to rotate by a motor mounted on the frame.

[0007] The paper thickness detection assembly includes a detection shaft and a detection sensor that are spaced apart and mounted on the frame. A detection lever and a detection baffle are mounted on the detection shaft. The outer end of the detection lever is connected to the upper end of the pressure sleeve. Large and small sector-shaped parts that cooperate with the detection sensor are respectively set on the outer periphery of both ends of the detection baffle. A torsion spring is fitted on the detection shaft. The inner end of the torsion spring is connected to the detection baffle, and the outer end is connected to the frame.

[0008] Furthermore, the paper guiding assembly includes an upper guide plate and a lower guide plate that are installed at intervals on the frame, forming a paper feeding channel between the upper guide plate and the lower guide plate, and the output ends of the upper guide plate and the lower guide plate are respectively provided with clearance holes to make way for the upper paper feeding roller and the lower paper feeding roller.

[0009] Furthermore, the outer end of the torsion spring is connected to the frame.

[0010] Furthermore, two detection sensors are provided, one for detecting the large sector and the other for detecting the small sector.

[0011] Furthermore, the detection sensor is electrically connected to the printer controller, a paper detection sensor electrically connected to the printer controller is installed in the paper feed path, and a motor electrically connected to the controller is installed on the frame, with the motor and the lower paper feed roller being driven by a belt.

[0012] Furthermore, the detection sensor is an optical detection sensor with the model number RPI-441C1. When the sensor's optical path is blocked, the detection sensor feeds back a high level; otherwise, it remains at a low level, thus enabling real-time detection of paper thickness.

[0013] Furthermore, the upper paper feeding roller includes several upper paper feeding roller units connected in sequence. Each upper paper feeding roller unit includes a paper feeding roller. The axle portions of adjacent paper feeding rollers are connected by a coupling. The frame is provided with several slots at intervals along the length direction of the upper paper feeding roller. The pressure sleeve and the detection lever are set one-to-one.

[0014] A method for adaptive paper thickness adjustment in a printer: When paper enters the paper feed path, a paper detection sensor is triggered, sending a signal to the controller. The motor drives the lower paper feed roller to rotate, which in turn drives the upper paper feed roller meshing with it. When the paper passes between the lower and upper paper feed rollers, the upper paper feed roller is lifted by the paper, and the pressure sleeve moves upward accordingly. This causes the detection lever to rotate, resulting in the rotation of the detection shaft. The large and small sector-shaped portions on the detection baffle move closer to the detection sensor. When the paper thickness gradually increases to the first threshold, the large sector-shaped portion just blocks the light path of one detection sensor, triggering a signal. The controller receives the signal and controls the print head to lift. When the paper thickness continues to increase to the second threshold, the small sector-shaped portion blocks the light path of another group of detection sensors, triggering another signal. The controller receives the signal and controls the print head to lift again, thus achieving adaptive paper thickness adjustment in the printer.

[0015] Compared with the prior art, the present invention has the following advantages: it has a simple structure and reasonable design, and can automatically adjust the distance between the print head and the print plate through the paper thickness detection signal, avoiding poor printing quality or damage to the print head due to inaccurate manual adjustment, improving the user experience and extending the service life of the machine. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is an installation effect diagram of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Section AA view;

[0019] Figure 3 for Figure 2 A partial enlarged view of

[0020] Figure 4 Diagram of the upper paper feed roller assembly and the compression spring sleeve;

[0021] Figure 5 This is a schematic diagram of the paper thickness detection component.

[0022] Figure 6 for Figure 5 A partial enlarged view of

[0023] Figure 7 This is a schematic diagram of the detection sensor;

[0024] Figure 8 This is a schematic diagram of the paper thickness detection component installation.

[0025] In the diagram: 1-Left side plate of the frame; 2-Upper gear; 3-Motor; 4-Right side plate of the frame; 5-Lower gear; 6-Upper paper feed roller; 7-Pressure sleeve; 8-Detection lever; 9-Compression spring; 10-Detection baffle; 11-Detection sensor; 12-Upper guide plate; 13-Lower guide plate; 14-Lower paper feed roller; 15-Detection shaft; 16-Bolt; 17-Torsion spring; 18-Large sector; 19-Small sector; 20-Optical path groove on the detection sensor. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-8 As shown, a printer paper thickness detection device includes a paper guide assembly and a paper feed assembly installed sequentially on the frame along the paper conveying direction, and a paper thickness detection assembly is installed on the paper feed assembly on the frame.

[0028] The paper feeding assembly includes an upper paper feeding wheel 6 and a lower paper feeding wheel 14 arranged at intervals. The shafts at both ends of the upper paper feeding wheel are mounted in the slots on the frame. A pressure sleeve 7 is provided in the slots, covering the shafts of the upper paper feeding wheel from above. The upper end of the pressure sleeve is connected to the frame via a compression spring 9. An upper gear 2 and a lower gear 5 that mesh with each other are respectively installed on the axle at one end of the upper and lower paper feeding wheels. One of the upper and lower paper feeding wheels is driven to rotate by a motor mounted on the frame.

[0029] The paper thickness detection assembly includes a detection shaft 15 and a detection sensor 11, which are spaced apart and mounted on the frame. A detection lever 8 and a detection baffle 10 are mounted on the detection shaft. The detection lever and the detection baffle are interference-fitted with the detection shaft and locked with bolts 16 to ensure synchronous rotation. The outer end of the detection lever is attached to or sleeved on the upper end of the pressure sleeve. Large sector 18 and small sector 19, which cooperate with the detection sensor, are respectively provided on the outer periphery of both ends of the detection baffle. A torsion spring 17 is mounted on the detection shaft. The inner end of the torsion spring is connected to the detection baffle, and the outer end is connected to the frame. The reset torsion spring acts on the detection baffle to ensure that the detection lever is always in contact with the pressure sleeve.

[0030] In this embodiment, the paper guiding assembly includes an upper guide plate 12 and a lower guide plate 13 that are installed at an interval on the frame. A paper feeding channel is formed between the upper guide plate and the lower guide plate. The output ends of the upper guide plate and the lower guide plate are respectively provided with clearance holes to make way for the upper paper feeding roller and the lower paper feeding roller.

[0031] In this embodiment, the outer end of the torsion spring is connected to the frame.

[0032] In this embodiment, two detection sensors are provided, one for detecting the large sector and the other for detecting the small sector.

[0033] In this embodiment, the detection sensor is electrically connected to the printer controller, a paper detection sensor electrically connected to the printer controller is installed in the paper feed channel, and a motor 3 electrically connected to the controller is installed on the frame, with the motor and the lower paper feed roller being driven by a belt.

[0034] In this embodiment, the detection sensor is model RPI-441C1.

[0035] In this embodiment, the upper paper feed roller includes several upper paper feed roller units connected in sequence. Each upper paper feed roller unit includes a paper feed roller. The axle portions of adjacent paper feed rollers are connected by couplings. The frame is provided with several slots at intervals along the length direction of the upper paper feed rollers. The pressure sleeve and the detection lever are set one-to-one. In particular, since the upper paper feed roller 6 is composed of multiple upper paper feed roller units and couplings, even when the width of the paper is small (but still greater than the distance between two paper feed rollers), it can still ensure that the upper paper feed roller units rise normally and correctly reflect the paper thickness.

[0036] A method for adaptive paper thickness adjustment in a printer: When paper enters the paper feed path, a paper detection sensor is triggered, sending a signal to the controller. A motor drives the lower paper feed roller to rotate, which in turn drives the upper paper feed roller meshing with it. As the paper passes between the lower and upper paper feed rollers, the upper paper feed roller is lifted by the paper, and the pressure sleeve moves upward, causing the detection lever to rotate. This rotates the detection shaft, and the large and small sector-shaped sections on the detection baffle move closer to the detection sensor. When the paper thickness gradually increases to the first threshold, the large sector-shaped section blocks the light path of one detection sensor, triggering a signal. The controller receives this signal and adjusts the print head to lift. When the paper thickness continues to increase to the second threshold, the small sector-shaped section blocks the light path of another group of detection sensors, triggering another signal. The controller receives this signal and adjusts the print head to lift again, thus achieving adaptive paper thickness adjustment. This design can divide paper thickness into three ranges, allowing the print head to adapt to thicker paper.

[0037] If this patent discloses or relates to components or structural parts that are fixedly connected to each other, then unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be disassembled (e.g., using bolts or screws) or a fixed connection that cannot be disassembled (e.g., riveting or welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).

[0038] In this embodiment, the T-shaped section increases the contact surface of the overall structure, thereby increasing the resistance generated by friction and improving the stability of the structure. The concave steel channel and steel plate assembly are anchored in the cap beam unit and pier beam by studs, which greatly increases the stability of the structure. The prestressed tendon tensioning and anchoring method greatly shortens the required working time compared with the traditional cast-in-place construction, effectively shortening the construction period and improving efficiency in large and medium-length bridge projects. The shear key, through the friction between the universal joint, connecting steel plate and concave steel channel, forms a shear force transfer between the pier beam and the cap beam, thus forming a combined working form and effectively improving the shear resistance of the splice surface.

[0039] In the description of this patent, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent 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 patent.

[0040] The preferred embodiments listed above further illustrate the objectives, technical solutions and advantages of the present invention in detail. It should be understood that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A printer paper thickness detection device, characterized in that: It includes a paper guide assembly and a paper feeding assembly which are sequentially installed on a frame along a paper conveying direction, and a paper thickness detection assembly is installed on the paper feeding assembly on the frame; The paper feeding assembly comprises an upper paper feeding wheel and a lower paper feeding wheel which are arranged at intervals from top to bottom. The shafts at both ends of the upper paper feeding wheel are placed in brackets on the frame. A pressing sleeve is arranged in the bracket to cover the shaft of the upper paper feeding wheel from above. The upper end of the pressing sleeve is connected to the frame via a compression spring. An upper gear and a lower gear which mesh with each other are respectively installed on the wheel shafts at one end of the upper paper feeding wheel and the lower paper feeding wheel. One of the upper paper feeding wheel and the lower paper feeding wheel is driven to rotate by a motor installed on the frame. The paper thickness detection assembly comprises a detection shaft and a detection sensor installed at intervals on the frame, a detection lever and a detection baffle are installed on the detection shaft, the outer end of the detection lever is connected to the upper end of the pressure sleeve, and the outer periphery of the two ends of the detection baffle is respectively provided with a large fan-shaped part and a small fan-shaped part that match the detection sensor, and a torsion spring is sleeved on the detection shaft, the inner end of the torsion spring is connected to the detection baffle, and the outer end is connected to the frame; The paper guide assembly comprises an upper paper guide and a lower paper guide installed on the frame at an interval, wherein a paper feeding channel is formed between the upper paper guide and the lower paper guide, and the output ends of the upper paper guide and the lower paper guide are respectively provided with a clearance hole for making way for the upper paper feeding wheel and the lower paper feeding wheel; The upper paper feed wheel includes a plurality of upper paper feed wheel units connected in sequence, each upper paper feed wheel unit includes a paper feed wheel, the wheel shafts of adjacent paper feed wheels are connected via a coupling, a plurality of brackets are arranged at intervals along the length direction of the upper paper feed wheel on the frame, and the pressing sleeve and the detection lever are arranged one by one.

2. The printer paper thickness detection device according to claim 1, characterized in that: The outer end of the torsion spring is connected to the frame.

3. The printer paper thickness detection device according to claim 2, characterized in that: Two detection sensors are provided, which are used to detect the large fan-shaped portion and the small fan-shaped portion respectively.

4. The printer paper thickness detection device according to claim 3, characterized in that: The detection sensor is electrically connected to the controller of the printer, a paper detection sensor electrically connected to the controller of the printer is arranged in the paper feeding channel, a motor electrically connected to the controller is installed on the frame, and the motor is driven by the lower paper feeding wheel.

5. The printer paper thickness detection device according to claim 3, characterized in that: The model of the detection sensor is RPI-441C1.

6. A method for adaptively adjusting the thickness of printer paper, using the printer paper thickness detection device as claimed in claim 4, characterized in that: When paper enters the paper feeding channel, the paper detection sensor is triggered to send a signal to the controller, and the motor drives the lower paper feeding wheel to rotate, and the lower paper feeding wheel drives the upper paper feeding wheel meshing with it to rotate. When the paper passes between the lower paper feeding wheel and the upper paper feeding wheel, the upper paper feeding wheel is lifted up by the paper, and the pressure sleeve also moves up, and then the detection lever rotates, causing the detection shaft to rotate, and the large sector-shaped part and the small sector-shaped part on the detection baffle are close to the detection sensor; When the paper thickness gradually increases to the first threshold, the large fan-shaped part just blocks the light path of one detection sensor, triggering a signal. The controller receives the signal and controls the adjustment of the print head lift. When the paper thickness continues to increase to the second threshold, the small fan-shaped part blocks the light path of another detection sensor group, triggering a signal again. The controller receives the signal and controls the adjustment of the print head lift again, thereby realizing adaptive adjustment of the paper thickness of the printer.

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