Constant-length webbing mechanism

Abstract

The application discloses a fixed-length ribbon winding mechanism. The mechanism comprises a mechanism frame, a ribbon shaft, a driving gear, a driven gear, a waste ribbon shaft, a ribbon roll, a waste ribbon roll and a ribbon guide shaft. The ribbon shaft is rotatably installed on the mechanism frame, the driving gear is fixedly sleeved on the ribbon shaft, the waste ribbon shaft is rotatably installed on the mechanism frame, the driven gear is fixedly sleeved on the waste ribbon shaft, and the driving gear is engaged with the driven gear. One end of the ribbon is wound on the ribbon shaft, and the other end is wound on the waste ribbon shaft. The ribbon between the ribbon shaft and the waste ribbon shaft passes through a fixed-length driving assembly and the ribbon guide shaft. The application ensures that the length of the ribbon moved each time is fixed, avoids waste of the ribbon, saves a motor drive, saves cost, simplifies the structure, and makes the device more reliable.

Description

Technical Field

[0001] This invention relates to a mechanically positioned tape winding device, and more particularly to a fixed-length tape winding mechanism. Background Technology

[0002] On the tire online uniformity dynamic balancing testing line, the tires that have completed the test need to be graded by marking. According to the set rules, different grades of tires need to be marked with different marks to distinguish them. In the marking mechanism, the colored tape used for marking needs to be pulled out, the used tape is rewound, and a new tape is covered over the marking head.

[0003] The current method involves adding a motor to the waste tape rewinding shaft to drive the waste tape to rewind while simultaneously pulling out new tape. This method requires a drive motor, which is costly. Furthermore, as more and more waste tape is rewound, the rewinding diameter continuously increases, resulting in longer and longer tapes being pulled out each time, leading to larger and larger marking gaps and wasting tape.

[0004] The updated approach, in order to avoid the aforementioned waste of ribbon, adds an encoder wheel to the mechanism to determine the length of the ribbon being pulled, so that the motor stops rotating when the ribbon is pulled out to the target length. Although this method solves the problem of ribbon waste, the addition of the encoder wheel and sensor makes the mechanism more complex and costly. Summary of the Invention

[0005] In order to solve the problems existing in the background art, the present invention provides a fixed-length tape winding mechanism, which solves the problems of diameter change and uncertainty when the tape is pulled out, which makes it impossible to control the fixed length by rotating the motor, as well as the technical problem of tape slippage on the shaft, and also solves the problems existing in the background art.

[0006] The device of this invention does not require the use of a motor to wind the tape, while ensuring that the length of the tape pulled each time is consistent, thus reducing costs and avoiding tape waste.

[0007] The technical solution adopted in this invention is:

[0008] The present invention includes a mechanism frame, a ribbon shaft, a driving gear, a driven gear, a waste ribbon shaft, a ribbon roll, a waste ribbon roll, and a ribbon guide shaft; the ribbon shaft is rotatably mounted on the mechanism frame, the driving gear is fixedly mounted on the ribbon shaft, the waste ribbon shaft is rotatably mounted on the mechanism frame, the driven gear is fixedly mounted on the waste ribbon shaft, and the driving gear meshes with the driven gear; one end of the ribbon is wound on the ribbon shaft, and the other end is wound on the waste ribbon shaft, and the ribbon path between the ribbon shaft and the waste ribbon shaft is a fixed-length drive assembly and a ribbon guide shaft, the fixed-length drive assembly being used to drive the ribbon to move at a fixed length.

[0009] The ribbon shaft is rotatably mounted on the mechanism frame via a one-way bearing, which allows the ribbon shaft to rotate in a direction in which its upper surface can only approach the side of the waste ribbon shaft.

[0010] Both the ribbon shaft and the waste ribbon shaft are located on the upper part of the mechanism frame. Directly below each of the ribbon shaft and the waste ribbon shaft, there are two ribbon guide shafts arranged at intervals in the vertical direction, so that the ribbon from the ribbon shaft to the waste ribbon shaft is arranged along a U-shaped path under the guidance of the ribbon guide shafts.

[0011] The fixed-length drive assembly is located at a vertically arranged section of the colored tape below the waste tape shaft.

[0012] The fixed-length drive assembly includes a tension spring, a knurled cam, and a belt pull groove. The belt pull groove is movable on the mechanism frame parallel to the ribbon arrangement direction. The top of the belt pull groove and the tension spring are elastically connected to the upper part of the mechanism frame. The belt pull groove has a strip groove for the ribbon to pass through as a belt pull groove. The ribbon passes through the strip groove. The knurled cam is installed inside the belt pull groove and extends into the strip groove to contact the ribbon.

[0013] The knurled cam is a cylindrical roller structure with an eccentric hinge, and the eccentric position is on the lower side away from the strip groove.

[0014] The knurled cam surface is machined with rough textures, which are set on the side of the knurled cam that extends into the strip groove and contacts the ribbon.

[0015] The colored strip below the waste strip shaft is arranged vertically, and the pull strip groove can be moved up and down on the mechanism frame via a slide rail.

[0016] The aforementioned pull-belt groove can be driven downward by external force.

[0017] The beneficial effects of this invention are:

[0018] This invention ensures that the moving distance of the tape groove is the same as the pulling length of the tape, thus preventing tape waste.

[0019] In this invention, the mechanism is driven by a tension spring and a marking head, eliminating the need for a motor drive, saving costs, simplifying the structure, and making the mechanism more reliable. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the device of the present invention.

[0021] Figure 2 This is a side view of the device of the present invention.

[0022] Figure 3 This is a structural cross-sectional view of the fixed-length drive component.

[0023] Figure 4 This is a structural diagram of the device of the present invention after the ribbon is pulled down to a fixed length.

[0024] Figure 5 This is a structural diagram of the device of the present invention after the ribbon is returned to its fixed length.

[0025] In the figure: mechanism frame (1), one-way bearing (2), ribbon shaft (3), driving gear (4), driven gear (5), waste ribbon shaft (6), ribbon roll (7), waste ribbon roll (8), ribbon guide shaft (9), tension spring (10), knurled cam (11), and ribbon groove (12). Detailed Implementation

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

[0027] like Figure 1 and Figure 2 As shown, the device includes a mechanism frame 1, a one-way bearing 2, a ribbon shaft 3, a driving gear 4, a driven gear 5, a waste ribbon shaft 6, a ribbon roll 7, a waste ribbon roll 8, and a ribbon guide shaft 9;

[0028] The ribbon shaft 3 is rotatably mounted on the mechanism frame 1 via a one-way bearing 2, allowing it to rotate only counterclockwise and not clockwise. The drive gear 4 is fixedly mounted on the ribbon shaft 3, driving it to rotate unidirectionally. The waste ribbon shaft 6 is rotatably mounted on the mechanism frame 1 via a common bearing, allowing it to rotate freely. The driven gear 5 is fixedly mounted on the waste ribbon shaft 6, driving it to rotate. The drive gear 4 meshes with the driven gear 5, ensuring that both the ribbon shaft 3 and the waste ribbon shaft 6 can only rotate in one direction due to the meshing transmission between them.

[0029] One end of the ribbon is wound on the ribbon shaft 3, and the other end is wound on the waste ribbon shaft 6. The ribbon path between the ribbon shaft 3 and the waste ribbon shaft 6 is a fixed-length drive assembly and a ribbon guide shaft 9. The ribbon is guided through the path of the ribbon by the ribbon guide shaft 9. The fixed-length drive assembly is used to drive the ribbon to move at a fixed length, so that it is wound out of the ribbon shaft 3 and into the waste ribbon shaft 6.

[0030] The ribbon is wound onto the ribbon shaft 3 to form a ribbon roll 7. The ribbon roll 7 is fitted onto the ribbon shaft 3, and there is appropriate friction between the ribbon roll 7 and the ribbon shaft 3.

[0031] The mechanism frame 1 serves as the mounting bracket for all other components. The one-way bearing 2 is a type of bearing that allows rotation in only one direction; it locks in the opposite direction and cannot rotate. The ribbon shaft 3 is mounted on the mechanism frame 1 in a unidirectional rotatable manner via the one-way bearing 2, which allows the ribbon shaft 3 to rotate in a direction in which its upper surface can only approach the side of the waste ribbon shaft 6.

[0032] There are four ribbon guide shafts 9, which are fixed to the mechanism frame 1 to guide the ribbon. The ribbon shaft 3 and the waste ribbon shaft 6 are both located on the upper part of the mechanism frame 1. Directly below each of the ribbon shaft 3 and the waste ribbon shaft 6, two ribbon guide shafts 9 are arranged vertically at intervals, so that the ribbon from the ribbon shaft 3 to the waste ribbon shaft 6 is arranged along a U-shaped path under the guidance of the ribbon guide shafts 9.

[0033] The fixed-length drive assembly is located on a vertically arranged section of the colored tape below the waste tape shaft 6.

[0034] like Figure 3 As shown, the fixed-length drive assembly includes a tension spring 10, a knurled cam 11, and a belt pull groove 12. The belt pull groove 12 is movably mounted on the mechanism frame 1 parallel to the ribbon arrangement direction. At the same time, the top of the belt pull groove 12 is elastically connected to the tension spring 10 and the upper part of the mechanism frame 1. The belt pull groove 12 has a strip groove for the ribbon to pass through as a belt pull groove. The ribbon passes through the strip groove. The knurled cam 11 is installed inside the belt pull groove 12 and extends into the strip groove to contact the ribbon.

[0035] The knurled cam 11 is a cylindrical roller structure with an eccentric hinge, and the eccentric position is on the lower side away from the strip groove.

[0036] The surface of the knurled cam 11 is machined with rough texture. The rough texture is set on the side of the knurled cam 11 that extends into the strip groove and contacts the ribbon. Under the action of gravity, the rough texture of the knurled cam 11 is close to one side of the strip groove of the tape groove body 12 and is used to contact the ribbon passing through the strip groove.

[0037] The tension spring 10 is connected to the mechanism frame 1 and the pull belt groove 12 at both ends, so that the pull belt groove 12 can slide along the slide rail to the upper position without the action of external force.

[0038] The colored tape below the waste tape shaft 6 is arranged vertically, and the tape pull groove 12 is installed on the mechanism frame 1 and can move up and down via a slide rail.

[0039] The pull groove 12 can be driven downward by the external force applied by the upper marking head.

[0040] The bottom surface of the frame 1 has a notch through which the ribbon passes, allowing the external object to be marked to come into contact with the ribbon. Above the ribbon at the notch, a marking head is arranged for marking the object.

[0041] The implementation process of this invention is as follows:

[0042] When the circumferential force on the ribbon roll 7 is greater than the frictional force, the ribbon roll 7 and the ribbon shaft 3 can rotate relative to each other. This will cause the ribbon on the ribbon shaft 3 to slip. If the fixed-length winding is controlled by the motor, accurate fixed-length winding cannot be achieved.

[0043] In this invention, after the ribbon in the ribbon roll 7 is pulled out, it passes through four ribbon guide shafts 9 and the ribbon pulling groove 12, and is wound around the waste ribbon shaft 6 to form a waste ribbon roll 8. The waste ribbon shaft 6 and the waste ribbon roll 8 cannot rotate relative to each other.

[0044] When fixed-length winding is required, operate as follows:

[0045] like Figure 4 As shown, when the pull belt groove 12 is subjected to external force to overcome the tension of the tension spring 10 and moves downward, the pull belt groove 12 moves downward relative to the ribbon. This causes the friction generated by the ribbon contacting the knurled cam 11 to rotate the knurled cam 11 outward, causing the knurled cam 11 to relax. Since the relative movement direction of the pull belt groove 12 and the ribbon is the same as the relaxation direction of the knurled cam 11, the knurled cam 11 and the pull belt groove 12 have no tension on the ribbon. At the same time, due to the unidirectional rotation characteristic of the ribbon shaft 3, the ribbon remains stationary, while the pull belt groove 12 and the knurled cam 11 move downward as a whole.

[0046] like Figure 5 As shown, when the external force is removed, the pull belt groove 12 moves upward and returns to its original position under the action of the tension spring 10, overcoming gravity. The pull belt groove 12 moves upward relative to the ribbon. The friction generated by the ribbon contacting the knurled cam 11 will rotate the knurled cam 11 inward, causing the knurled cam 11 to continuously press the ribbon. Since the relative movement direction of the pull belt groove 12 and the ribbon is the same as the pressing direction of the knurled cam 11, the knurled cam 11 and the strip groove of the pull belt groove 12 together clamp the ribbon, thereby driving the ribbon to pull upward.

[0047] Then, a pulling force is applied to the tape groove 12 to move the tape groove 12 downward. This process is repeated continuously to achieve the process of tape relaxation and tape tightening and upward movement.

[0048] Since the downward position of the tape pull groove 12 and the return position of the tape pull groove 12 are both fixed, the tape can move a fixed distance between the downward position of the tape pull groove 12 and the return position of the tape pull groove 12.

[0049] A marking head is installed above the tape groove 12. The external force applied by the marking head to the top surface of the tape groove 12 drives the tape groove 12 to move downward. As the marking head moves downward, it also moves the tape groove 12 downward while marking, and the tape remains stationary.

[0050] After marking is completed, the marking head moves upward and the pressure on the tape puller 12 is removed. The tape puller 12 moves upward under the action of the tension spring 10, pulling the tape to move a fixed length. Thus, the marking head returns to its original position while the tape moves a fixed length, realizing the recycling of waste tape and the release of new tape.

Claims

1. A fixed-length winding mechanism, characterized in that: The system includes a frame (1), a ribbon shaft (3), a drive gear (4), a driven gear (5), a waste ribbon shaft (6), a ribbon roll (7), a waste ribbon roll (8), and a ribbon guide shaft (9). The ribbon shaft (3) is rotatably mounted on the frame (1), the drive gear (4) is fixedly mounted on the ribbon shaft (3), the waste ribbon shaft (6) is rotatably mounted on the frame (1), and the driven gear (5) is fixedly mounted on the waste ribbon shaft (6). The drive gear (4) meshes with the driven gear (5). One end of the ribbon is wound on the ribbon shaft (3), and the other end is wound on the waste ribbon shaft (6). The ribbon path between the ribbon shaft (3) and the waste ribbon shaft (6) is a fixed-length drive assembly and a ribbon guide shaft (9). The fixed-length drive assembly is used to drive the ribbon to move at a fixed length. The fixed-length drive assembly includes a tension spring (10), a knurled cam (11), and a belt groove (12). The belt groove (12) is movably mounted on the mechanism frame (1) parallel to the ribbon arrangement direction. At the same time, the top of the belt groove (12) and the tension spring (10) are elastically connected to the upper part of the mechanism frame (1). The belt groove (12) has a strip groove for the ribbon to pass through as a belt groove. The ribbon passes through the strip groove. The knurled cam (11) is installed inside the belt groove (12) and extends into the strip groove to contact the ribbon. The knurled cam (11) is a cylindrical roller structure with an eccentric hinge, and the eccentric position is on the lower side away from the strip groove. The ribbon shaft (3) and waste ribbon shaft (6) are both located on the upper part of the mechanism frame (1). Two ribbon guide shafts (9) are arranged vertically at intervals directly below the ribbon shaft (3) and waste ribbon shaft (6), so that the ribbon from the ribbon shaft (3) to the waste ribbon shaft (6) is arranged along a U-shaped path under the guidance of the ribbon guide shafts (9). The bottom surface of the mechanism frame (1) has a notch, through which the color ribbon passes. The notch is used for the external object to be marked to contact the color ribbon. A marking head for marking the object to be marked is arranged above the color ribbon at the notch. The tape groove (12) is driven to move downward by the external force applied by the marking head.

2. The fixed-length winding mechanism according to claim 1, characterized in that: The ribbon shaft (3) is rotatably mounted on the mechanism frame (1) via a one-way bearing (2), which allows the ribbon shaft (3) to rotate in a direction in which its upper surface can only approach the waste ribbon shaft (6).

3. The fixed-length winding mechanism according to claim 1, characterized in that: The fixed-length drive assembly is located at a vertically arranged section of the colored tape below the waste tape shaft (6).

4. The fixed-length winding mechanism according to claim 1, characterized in that: The surface of the knurled cam (11) is machined with rough texture, which is set on the side of the knurled cam (11) that extends into the strip groove and contacts the ribbon.

5. A fixed-length winding mechanism according to claim 1, characterized in that: The colored strip below the waste strip shaft (6) is arranged vertically, and the pull strip groove (12) can be moved up and down on the mechanism frame (1) via a slide rail.

Images