A number tube printing color band control device

Abstract

The application relates to the technical field of harness processing, and discloses a color band control device for number tube printing, which comprises a feeding guide mechanism, a printing head and a color band recovery mechanism.The feeding guide mechanism comprises a main shaft, a transmission shaft and a first transmission belt sleeved between the main shaft and the transmission shaft, the main shaft is connected with a driving piece, and a feeding wheel is fixedly connected to the main shaft and the transmission shaft; the printing head is abutted against the feeding wheel of the transmission shaft, and a number tube passes between the feeding wheel and the printing head; the color band recovery mechanism comprises a color band recovery disc, a fixed shaft, a driving wheel and a driven wheel, the driving wheel and the driven wheel are sleeved with a second transmission belt, one end of the fixed shaft is fixedly connected with the color band recovery disc, the other end of the fixed shaft is fixedly connected with the driven wheel, the driving wheel is rotatably installed on the transmission shaft, and a transmission assembly for driving the driving wheel to rotate is installed on the transmission shaft; and the color band recovery disc is dragged by the printing head and the number tube to realize color band feeding. The application can realize timely recovery of the color band in the printing process.

Description

Technical Field

[0001] This application relates to the technical field of wire harness processing, and in particular to a ribbon control device for number tube printing. Background Technology

[0002] The wire harness industry uses number tubes to identify wire harnesses to ensure proper connection, installation, safe operation, and ease of maintenance of wires and cables.

[0003] As described in the utility model application CN201620451417.4, the automatic printing device for number tubes operates simultaneously with the feeding wheel and the rotating shaft of the ribbon printing device, causing the ribbon and number tube to move synchronously, while the ribbon printing head prints marks on the moving number tube.

[0004] In existing automatic printing devices, the ribbon is fed by dragging the print head alone. Waste ribbon cannot be actively recycled during the printing process, and the ribbon tends to accumulate and needs to be processed, resulting in low efficiency. Summary of the Invention

[0005] In order to promptly and proactively recycle waste ribbons, this application provides a ribbon control device for number tube printing.

[0006] This application provides a ribbon control device for number tube printing, which adopts the following technical solution: A ribbon control device for number tube printing, comprising: The feeding guide mechanism includes a main shaft and a drive shaft, and a first transmission belt sleeved between the main shaft and the drive shaft. The main shaft is connected to a driving component, and a feeding wheel is fixedly connected to both the main shaft and the drive shaft. The print head abuts against the feed wheel of the drive shaft, and the number tube passes between the feed wheel and the print head; A ribbon recycling mechanism includes a ribbon recycling reel, a fixed shaft, a drive wheel, and a driven wheel. A second transmission belt is sleeved between the drive wheel and the driven wheel. One end of the fixed shaft is fixedly connected to the ribbon recycling reel, and the other end of the fixed shaft is fixedly connected to the driven wheel. The drive wheel is rotatably mounted on the transmission shaft, and a transmission assembly that drives the drive wheel to rotate is mounted on the transmission shaft. The ribbon feed tray has the ribbon wound on it. After passing the print head, the ribbon is wound onto the ribbon return tray. The ribbon is fed out by dragging the print head and the number tube.

[0007] By adopting the above technical solution, the feeding guide mechanism consists of a drive component, a main shaft, a transmission shaft, a first transmission belt, and a feeding wheel. It is used to transport the number tubes. The print head abuts against the feeding wheel on the transmission shaft, and the number tubes pass between them to achieve printing. The drive wheel is mounted on the transmission shaft through a transmission assembly and can obtain power from the transmission shaft. It then drives the driven wheel and the fixed shaft through the second transmission belt, ultimately driving the ribbon reel to rotate. The ribbon unloading tray itself has no power. The ribbon on it is wound onto the ribbon reel after passing through the print head. The unloading action is achieved by the print head and the number tubes being dragged. The transmission shaft is not only the core component for transporting the number tubes, but also provides rotational power to the ribbon reel through the transmission assembly. This design realizes the mechanical linkage between number tube transportation and ribbon recycling, ensuring the tension and timely recycling of the ribbon during the printing process. It fundamentally solves the problem of redundant accumulation caused by the passive dragging of the ribbon and improves the stability and efficiency of the printing process.

[0008] Optionally, the transmission assembly includes: A retaining ring is fixedly installed on the end of the drive shaft away from the feed wheel; Friction pads are attached to the axial end face of the drive wheel; An elastic element drives the friction pad to always adhere to the drive wheel.

[0009] By adopting the above technical solution, when the diameter of the ribbon winding on the ribbon reel increases, resulting in increased recycling resistance, or when the ribbon is stuck at the printhead, slippage will occur between the drive wheel and the friction plate. This can prevent the ribbon from breaking or the number tube from being damaged due to excessive tension. At the same time, by adjusting the pressure of the elastic element, a maximum transmission torque can be set, thereby controlling the ribbon recycling tension and keeping it within a suitable range.

[0010] Optionally, the elastic element is a compression spring.

[0011] Optionally, the ribbon recovery mechanism further includes a tensioning pulley, on which the second drive belt is wound.

[0012] By adopting the above technical solution, the tensioner can eliminate the loosening of the second transmission belt after long-term use, ensuring the long-term stability and reliability of the transmission system.

[0013] Optionally, the tensioning wheel is rotatably mounted with a one-way bearing, and the tensioning wheel rotates around the one-way bearing when the ribbon is retracted.

[0014] By adopting the above technical solution, the one-way bearing allows the tension wheel to rotate freely during ribbon take-up (in one direction), but locks it in the reverse direction. When take-up stops or the drive belt tends to reverse, the locked tension wheel increases the transmission resistance, preventing the ribbon take-up reel from reversing due to inertia or the ribbon's own tension. This prevents reverse rotation, ensuring that the ribbon take-up process proceeds in one direction and preventing ribbon slack caused by the reel reversing, further enhancing the accuracy of ribbon control.

[0015] Optionally, the ribbon feeding tray is fixedly connected to a non-powered shaft, and the end of the non-powered shaft away from the ribbon is connected to a connecting ring and a rotating ring. The connecting ring rotates with the non-powered shaft, and the connecting ring and the rotating ring are coaxially arranged, with their axial end faces fitting together.

[0016] By adopting the above technical solution, although the feeding is passive, the completely unresisted feeding will cause the ribbon to be too loose. The contact ring and the rotating ring will fit together to generate a basic frictional torque, which will provide a slight resistance to the ribbon feeding tray and will not rotate and feed the material randomly due to inertia.

[0017] Optionally, a fixing block is fixedly connected to the end of the non-powered shaft, and a compression spring is installed between the fixing block and the connecting ring, the compression spring driving the connecting ring to abut against the rotating ring.

[0018] By adopting the above technical solution, the elastic force of the compression spring drives the connecting ring to fit tightly against the rotating ring, increasing the resistance and ensuring that the ribbon maintains a certain tension when it is not being dragged.

[0019] Optionally, it also includes a coil spring, the outer force-bearing end of which is fixedly connected to the outer wall of the rotating ring. When the ribbon feeding tray rotates to feed the ribbon, the coil spring is in a compressed state. When the ribbon feeding tray is stationary, the rotating ring drives the connecting ring to have a tendency to rotate in the opposite direction.

[0020] By adopting the above technical solution, when the ribbon is dragged during printing, the ribbon feed tray rotates, and the coil spring is compressed and stores energy. When dragging stops, the coil spring releases energy, causing the rotating ring to tend to rotate in the opposite direction. This tendency is transmitted to the ribbon feed tray through the connecting ring and the unpowered shaft, generating a reverse winding force. This force can immediately tighten any slight slack that may occur at the ribbon feed tray due to stopping, playing a role in "pre-tightening" or "anti-loosening". When the number tube needs to retract, the print head and the number tube move backward synchronously. If the ribbon at the feed end is loose at this time, there may be a situation where the number tube twists or shifts. However, the "pre-tightening" setting drives the loose ribbon to be retracted immediately, so that the print head always maintains contact with the number tube through the tensioned ribbon. This ensures that the number tube remains straight during the retraction process and will not twist or deviate in positioning, thereby ensuring that the character position is still correct and accurate when reused and reprinted.

[0021] In summary, this application includes at least one of the following beneficial effects: 1. By mechanically linking the ribbon recovery reel with the drive shaft of the number tube conveyor, the conveying power is diverted to the recovery mechanism, achieving active ribbon recovery. Simultaneously, an overload protection function is provided by incorporating a flexible transmission assembly consisting of friction plates and elastic elements along the transmission path. 2. Ensure the ribbon stays firmly attached to the print head at all times, so that even under complex conditions such as number tube retraction, the printing position of the characters can be guaranteed to be accurate, avoiding quality problems such as printing tilt and misalignment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the installation positions of the feed wheel and the print head in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the ribbon recovery mechanism in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the cooperation between the drive wheel and the drive shaft through a transmission assembly in an embodiment of this application.

[0023] Explanation of reference numerals in the attached drawings: 100, mounting bracket; 200, feeding guide mechanism; 210, main shaft; 211, driving component; 220, transmission shaft; 230, first transmission belt; 240, feeding wheel; 250, limit wheel; 300, print head; 400, ribbon recovery mechanism; 410, ribbon recovery reel; 420, fixed shaft; 430, driving wheel; 440, driven wheel; 450, second transmission belt; 460, transmission assembly; 461, fixed ring; 462, friction plate; 463, elastic element; 470, tension wheel; 471, positioning shaft; 500, ribbon unloading reel; 510, non-powered shaft; 520, connecting ring; 530, swivel ring; 540, fixing block; 550, compression spring; 600, coil spring. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail.

[0025] This application discloses a ribbon control device for number tube printing. (Refer to...) Figure 1 All the components of a ribbon control device for number tube printing are mounted on a mounting frame 100, including a feed guide mechanism 200, a print head 300, a ribbon recycling mechanism 400, and a ribbon feeding tray 500 that work together.

[0026] Reference Figure 2The feeding guide mechanism 200 is the power and conveying foundation of the entire device, including a main shaft 210 driven by a drive component 211, and a transmission shaft 220 linked to the main shaft 210 via a first transmission belt 230. The drive component 211 is a motor, and a synchronous pulley is fixedly mounted on the main shaft 210. The output shaft of the motor is connected to the synchronous belt and the synchronous pulley.

[0027] Reference Figure 1 and Figure 2 Both the main shaft 210 and the drive shaft 220 are fixedly fitted with feeding rollers 240. A limiting wheel 250 rotates in contact with the feeding roller 240 of the main shaft 210. The print head 300 abuts against the feeding roller 240 of the drive shaft 220. The number tubes pass sequentially between the feeding roller 240 and the limiting wheel 250, and between the feeding roller 240 and the print head 300. When the drive unit 211 is activated, the main shaft 210 rotates, driving the drive shaft 220 to rotate synchronously via the first transmission belt 230. The two feeding rollers 240 then work together to provide stable conveying power for the number tubes.

[0028] Reference Figure 1 and Figure 2 The ribbon recycling mechanism 400 includes a ribbon recycling reel 410, a fixed shaft 420, a drive wheel 430, and a driven wheel 440. A second transmission belt 450 is fitted between the drive wheel 430 and the driven wheel 440. One end of the fixed shaft 420 is fixed to the ribbon recycling reel 410, and the other end is fixedly connected to the driven wheel 440. The outer circumferences of the drive wheel 430 and the driven wheel 440 have a toothed structure, but the second transmission belt 450 has a smooth and flat belt structure. The toothed structure and the second transmission belt 450 have friction when in direct contact. To achieve active ribbon recycling, the drive wheel 430 is rotatably mounted on the transmission shaft 220 via bearings, and a transmission assembly 460 is mounted on the transmission shaft 220 to drive the drive wheel 430 to rotate. The transmission shaft 220 is both the power source for conveying the number tubes and provides power for ribbon recycling through the transmission assembly 460, realizing the mechanical linkage between conveying the number tubes and recycling the ribbon.

[0029] Reference Figure 1 The ribbon feed tray 500 itself is not powered; the ribbon wound on it bypasses the working area of ​​the print head 300 and eventually winds onto the ribbon collection tray 410. The release of the ribbon depends entirely on the drag force generated by the print head 300 and the number tube as they move forward. In contrast to the passive nature of the ribbon feed tray 500, the ribbon collection tray 410 is designed to rotate actively to ensure timely collection of waste ribbon.

[0030] In a preferred embodiment, refer to Figure 3The aforementioned transmission assembly 460 consists of a fixed ring 461, a friction plate 462, and an elastic element 463. The fixed ring 461 is fixedly installed at the end of the transmission shaft 220 away from the feed wheel 240, while the friction plate 462 is attached to the axial end face of the drive wheel 430. The elastic element 463 (specifically, it can be a compression spring, one end of which is fixed to the fixed ring 461, and the other end abuts against the friction plate 462) continuously applies pressure, driving the friction plate 462 to always be in close contact with the drive wheel 430. This friction transmission method forms a flexible connection: when the ribbon recovery resistance is normal, the torque of the transmission shaft 220 is smoothly transmitted to the drive wheel 430 through the friction plate 462; while when the recovery resistance increases abnormally (such as when the ribbon diameter increases or it gets stuck), slippage will occur between the drive wheel 430 and the friction plate 462, thereby cutting off the excessive torque transmission, effectively preventing the ribbon from breaking or damaging the printing components, and realizing overload protection and flexible adjustment of recovery tension.

[0031] In another preferred embodiment, refer to Figure 3 The ribbon recycling mechanism 400 is also equipped with several tensioning pulleys 470. In this embodiment, there are two tensioning pulleys 470. The driven pulley 440 is located between the two tensioning pulleys 470. The second transmission belt 450 is wound around the tensioning pulleys 470 to eliminate the loosening that may occur after long-term use of the second transmission belt 450 and ensure accurate and reliable transmission.

[0032] Furthermore, the tensioning wheel 470 is mounted on the mounting bracket 100 via a positioning shaft 471, which is fixedly mounted on the mounting bracket 100. A one-way bearing (not specifically shown in the figure) is rotatably installed between the tensioning wheel 470 and the positioning shaft 471. When the ribbon is being retracted normally, the tensioning wheel 470 rotates freely in one direction with the second drive belt 450. Once the retraction stops or the drive belt shows a tendency to move in the opposite direction, the one-way bearing immediately locks, effectively preventing the ribbon retraction disc 410 from reversing due to inertia by increasing resistance, thus eliminating secondary loosening of the retracted ribbon and ensuring the unidirectional stability of the ribbon path.

[0033] On the other hand, refer to Figure 1 and Figure 3To achieve precise control of the passive ribbon feed tray 500, the ribbon feed tray 500 is fixedly connected to a non-powered shaft 510, which is rotatably mounted on the mounting bracket 100. At the end of the non-powered shaft 510 furthest from the ribbon tray, a rotating ring 530 and a connecting ring 520 are sequentially arranged. The rotating ring 530 is rotatably mounted on the non-powered shaft 510 via a bearing, and the connecting ring 520 rotates synchronously with the rotation of the non-powered shaft 510. The connecting ring 520 and the rotating ring 530 are coaxially arranged, and their axial end faces are in contact with each other. A fixing block 540 is fixed to the end of the non-powered shaft 510. A compressed spring 550 is installed between the fixing block 540 and the connecting ring 520. The elastic force of the compressed spring 550 drives the connecting ring 520 to press tightly against the rotating ring 530, thereby generating a basic frictional torque between the two, providing slight rotational resistance to the ribbon feed tray 500 and preventing it from loosening due to inertia.

[0034] Reference Figure 3 As a further refinement of the feeding control, the device also incorporates a coil spring 600 structure, which is a constant-force coil spring. The coil spring 600 is mounted on the mounting bracket 100, and its outer force-bearing end is fixedly connected to the outer wall of the rotating ring 530. When the print head 300 drags the ribbon and the ribbon feed tray 500 rotates to feed the ribbon, the coil spring 600 is compressed and stores energy. When dragging stops and the feed tray is stationary, the coil spring 600 releases its energy, causing the rotating ring 530 to generate a slight reverse rotation tendency. This tendency is transmitted to the ribbon feed tray 500 through the mating connecting ring 520 and the fixed unpowered shaft 510, forming a reverse winding force. This force can instantly tighten any slight slack that occurs at the ribbon feed tray 500 due to stopping, acting as a "pre-tightening" mechanism. This is especially important when dealing with the complex situation of number tube retraction: when the number tube needs to retract, the print head 300 moves backward synchronously with the number tube. Thanks to the "pre-tightening" mechanism of the ribbon feed tray 500, the slack ribbon is immediately recovered, so that the print head 300 always maintains contact with the number tube through the tensioned ribbon. This ensures that the number tube remains straight during the retraction process and does not twist or deviate in positioning. This ensures that the character position remains accurate when reused or reprinted.

[0035] The implementation principle of the ribbon control device for number tube printing in this application is as follows: By mechanically linking the ribbon recovery reel 410 with the drive shaft 220 in the number tube conveyor link, the conveying power can be diverted to the ribbon recovery mechanism 400, realizing the active recovery of waste ribbon and fundamentally solving the problem of ribbon accumulation caused by dragging alone. At the same time, by setting a flexible transmission component 460 composed of friction plates 462 and elastic elements 463 in the power transmission path, overload slippage protection is achieved, and the tension can be automatically adjusted according to the recovery resistance to prevent ribbon breakage. On this basis, the compression spring 550 is used to keep the connecting ring 5 The ribbon 20, in contact with the rotating ring 530, generates basic damping. A coil spring 600 structure is introduced to automatically release energy during the unloading interval, generating a reverse winding force to achieve "pre-tightening" of the ribbon. Combined with a tensioning wheel 470 with a one-way bearing at the recycle end to prevent the recycle disc from reversing, a closed-loop tension control system is constructed for the entire process from unloading to recycle. This ensures that the ribbon remains in close contact with the number tube at the print head 300, maintaining its straightness and positioning accuracy even under complex conditions such as number tube retraction, ultimately significantly improving printing efficiency and character quality.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A ribbon control device for number tube printing, characterized in that, include: The feeding guide mechanism (200) includes a main shaft (210) and a drive shaft (220), and a first transmission belt (230) sleeved between the main shaft (210) and the drive shaft (220). The main shaft (210) is connected to a drive member (211), and a feeding wheel (240) is fixedly connected to both the main shaft (210) and the drive shaft (220). The print head (300) abuts against the feed wheel (240) of the drive shaft (220), and the number tube passes between the feed wheel (240) and the print head (300); A ribbon recycling mechanism (400) includes a ribbon recycling reel (410), a fixed shaft (420), a drive wheel (430), and a driven wheel (440). The drive wheel (430) and the driven wheel (440) are fitted together by a second transmission belt (450). One end of the fixed shaft (420) is fixedly connected to the ribbon recycling reel (410), and the other end of the fixed shaft (420) is fixedly connected to the driven wheel (440). The drive wheel (430) is rotatably mounted on the transmission shaft (220), and a transmission assembly (460) that drives the drive wheel (430) to rotate is mounted on the transmission shaft (220). The ribbon feed tray (500) is used to feed the ribbon after it has passed the print head (300) onto the ribbon recycling tray (410). The ribbon is fed out by dragging the print head (300) and the number tube.

2. The ribbon control device for number tube printing according to claim 1, characterized in that, The transmission assembly (460) includes: A retaining ring (461) is fixedly installed on the end of the drive shaft (220) away from the feed wheel (240); Friction pad (462) is attached to the axial end face of the drive wheel (430); The elastic element (463) drives the friction plate (462) to always be in contact with the drive wheel (430).

3. The ribbon control device for number tube printing according to claim 2, characterized in that, The elastic element (463) is a compression spring.

4. The ribbon control device for number tube printing according to claim 1, characterized in that, The ribbon recovery mechanism (400) also includes a tensioning pulley (470), on which the second drive belt (450) is wound.

5. The ribbon control device for number tube printing according to claim 4, characterized in that, The tensioning wheel (470) is rotatably mounted with a one-way bearing, and the tensioning wheel (470) rotates around the one-way bearing when the ribbon is retracted.

6. The ribbon control device for number tube printing according to claim 1, characterized in that, The ribbon feeding tray (500) is fixedly connected to a non-powered shaft (510). The end of the non-powered shaft (510) away from the ribbon is connected to a connecting ring (520) and a rotating ring (530) is rotatably connected. The connecting ring (520) rotates with the non-powered shaft (510). The connecting ring (520) and the rotating ring (530) are coaxially arranged, and the axial end faces of the connecting ring (520) and the rotating ring (530) are in contact with each other.

7. The ribbon control device for number tube printing according to claim 6, characterized in that, A fixing block (540) is fixedly connected to the end of the non-powered shaft (510). A compression spring (550) is installed between the fixing block (540) and the connecting ring (520). The compression spring (550) drives the connecting ring (520) to abut against the rotating ring (530).

8. The ribbon control device for number tube printing according to claim 7, characterized in that, It also includes a coil spring (600), the outer force-bearing end of the coil spring (600) is fixedly connected to the outer wall of the rotating ring (530). When the ribbon feeding tray (500) rotates to feed the ribbon, the coil spring (600) is in a compressed state. When the ribbon feeding tray (500) is stationary, the rotating ring (530) drives the connecting ring (520) to have a tendency to rotate in the opposite direction.

Images