Measuring tape with safety brake

Abstract

A measuring tape is described comprising: a measuring tape housing (1) provided with an accommodating cavity; a tape core assembly (2) disposed in the accommodating cavity; and a tape belt assembly (3) wound around the tape core assembly (2). The measuring tape housing (1) is further provided with a tape outlet for the tape belt assembly (3) to extend outwards.The measuring tape further comprises a braking assembly (4) and a drive assembly (5), wherein the drive assembly (5) is movably mounted on the measuring tape housing (1); the tape core assembly (2) is provided with a braking face (201); and in a state where the drive assembly (5) is moved to a braking position, the drive assembly (5) drives the braking assembly (4) to contact the braking face (201) of the tape core assembly (2) and press against it, thereby effecting braking. Abrasion of the scale on the surface of a tape belt is effectively prevented, and the service life of the measuring tape is extended.

Description

Measuring tape with safety brake TECHNICAL FIELD The present invention relates to a measuring tape and, in particular, to a more durable measuring tape with a good braking effect. BACKGROUND OF THE INVENTION Measuring tapes are a commonly used measuring tool. A typical measuring tape's braking system uses a brake pad to make contact with the tape strap. The friction between the brake pad and the strap stops the tape, thus achieving braking. Due to prolonged contact and friction between the tape strap and the brake pad, the scale on the tape's surface can easily become blurred, affecting the tape's normal use. Alternatively, the brake pad itself can wear down, reducing the tape's braking capacity. These issues can shorten the tape's lifespan. The braking system of the existing measuring tape must have a relatively large moving space, and the volume of the measuring tape must also have a relatively large housing space, resulting in an increase in the volume of the measuring tape. BRIEF DESCRIPTION OF THE INVENTION To overcome the shortcomings of the prior art, the present invention provides a measuring tape in which a tape brake assembly is in contact with a tape core assembly to achieve the braking effect of the measuring tape. This effectively prevents wear on the scale surface of the tape belt and increases the service life of the measuring tape. Furthermore, the tape brake system of the present invention requires minimal space, and consequently, the measuring tape of the present invention can be manufactured with a smaller volume. To achieve the above objective, the present invention is implemented by adopting the following technical solution: A measuring tape, comprising a measuring tape housing provided with an accommodating cavity, a tape core assembly disposed in the accommodating cavity, and a tape belt assembly wound around the tape core assembly, wherein the measuring tape housing is further provided with a tape outlet for the tape belt assembly to extend outwards; and comprising a braking assembly and a driving assembly, wherein the driving assembly is movably mounted in the measuring tape housing, the tape core assembly is provided with a braking face, and in a state in which the driving assembly moves to a braking position, the driving assembly drives the braking assembly to contact the braking face of the tape core assembly and press it, thereby effecting braking. IVIA / a / ZUZZ / UI or In the measuring tape, the assembly may include a single piece or a plurality of pieces. The braking assembly works in such a way that when the braking assembly is located in the braking position, the braking assembly comes into contact with the braking face of the tape core assembly and presses it, and the tape core assembly is restricted to stop rotating; otherwise, when the braking assembly is far from the braking position, the braking assembly and the braking face of the tape core assembly do not press against each other and the tape core assembly can rotate freely. Furthermore, the measuring tape comprises an elastic element acting on the drive assembly, in which an action force of the elastic element causes the drive assembly to tend to move to the braking position. One end of the elastic member is connected and fixed to the drive assembly, and the other end is connected and fixed to the tape measure housing. Specifically, the drive assembly is provided with a first elastic member fixing element, the first elastic member fixing element being a fixing hook, and a connecting end of the elastic member and the drive assembly is provided with a first fixing ring that mates with the first elastic member fixing element and is sleeved over the first elastic member fixing element.The measuring tape housing is provided with a second fixing element for the elastic element, the second fixing element for the elastic element is a fixing column, and a connecting end of the elastic element and the measuring tape housing is provided with a second fixing ring that coincides with the fixing element of the second elastic element and sleeved over the fixing element of the second elastic element. When the drive assembly is far from the braking position, the elastic member is in either a stretched or compressed state. When the elastic member is stretched, it tends to return to its original state, so the elastic force it generates pulls the drive assembly toward the braking position. When the elastic member is compressed, it tends to return to its original state, so the elastic force it generates pushes the drive assembly toward the braking position. The elastic member adopts a spring. In addition, the measuring tape can be configured so that: the drive assembly is slidably mounted in the measuring tape housing, and along a direction from the braking position to away from the braking position, a distance between an inner wall of the measuring tape housing where the drive assembly is disposed and the braking face of the tape core assembly is configured to change from small to large. In addition, the braking assembly is connected to the drive assembly. With the above structure, the braking assembly moves synchronously with the driving assembly. When the driving assembly is in the braking position, the braking assembly makes contact with the braking face of the belt core assembly and presses it against the core assembly. IVIA / a / ZUZZ / UI or the tape is restricted to stop rotating. When the brake assembly is far from the brake position, since the distance between the tape measure housing and the tape core assembly changes from small to large, the brake assembly in its mount moves from a small distance to a large distance, and the brake assembly separates from the brake face of the tape core assembly to allow free rotation of the tape core assembly. Furthermore, the braking assembly is a wedge-shaped member; the drive assembly extends from the tape measure housing to form an operating element, and the braking assembly is connected to the operating element via a connecting element. More specifically, the drive assembly is integrally molded with the braking assembly. The operating member is used by an operator to operate the drive assembly. Furthermore, the measuring tape can be configured such that: the drive assembly comprises a first drive element acting on the braking assembly, the first drive element is disposed on one side of the braking assembly, and in a state in which the drive assembly moves towards the braking position, the first drive element drives the braking assembly to make contact with the outer circumferential braking face of the tape core assembly and presses it. When the drive assembly moves to the braking position, the first drive element causes the brake assembly to make contact with the braking face of the belt core assembly. The first drive element presses against the brake assembly and transmits force to it, so that the brake assembly and the braking face of the belt core assembly are pressed together, restricting the belt core assembly from rotating. When the drive assembly is far from the braking position, the first drive element does not press down on the brake assembly, and the brake assembly and the belt core assembly are not pressed together, allowing free rotation of the belt core assembly. Furthermore, the drive assembly comprises a second drive element acting on the braking assembly, wherein the second drive element is arranged on a side opposite the first drive element. Since the second driving element is positioned on the opposite side of the first driving element—that is, the other side of the braking assembly—when the driving assembly is far from the braking position, the second driving element moves the braking assembly away from the braking face of the belt core assembly. This separates the braking assembly from the braking face of the belt core assembly. When the belt core assembly rotates freely, the contact between the belt core assembly and the braking assembly is reduced, minimizing wear and extending service life. Specifically, the drive assembly protrudes toward the braking face side of the belt core assembly to form the first drive element and the second drive element, and a movable space is formed to accommodate the braking assembly between the first drive element and the second drive element. IVIA / a / ZUZZ / UI or Furthermore, the first and second driving elements are rotatably arranged within the tape measure housing. One end of the first driving element acts on one side of the braking assembly, and one end of the second driving element acts on the other side. A braking force is applied to the first driving element, which in turn presses the braking assembly down, ensuring it always tends to contact the braking face of the tape core assembly and maintains pressure. When the tape measure is in reverse braking mode, a reverse braking force is applied to the second driving element. This reverse braking force lifts the braking assembly away from the braking face of the tape core assembly. Specifically, the first and second driving elements adopt a plate-like structure, and the braking force acts between a pivot point of the first driving element and an end in contact with the braking assembly. The reverse braking force acts on an end of the second driving element away from the braking assembly, and a pivot point of the second driving element is located between the reverse braking force and the braking assembly. More specifically, one end of the elastic member is fixed between the pivot point of the first driving member and the contact end with the braking assembly to provide braking force. The driving assembly comprises an operating element, which is rotatably arranged in the tape measure housing. One end of the operating element is provided with a reverse brake lever, and the reverse brake lever acts on the side of the second driving element furthest from the braking assembly to provide a reverse braking force. The elastic member acts on the first driving member. Since the point of action is located between the point of rotation and the contact end with the braking assembly, the contact end of the first driving member with the braking assembly rotates toward the side closest to the braking assembly to press down on the braking assembly, so that the braking assembly always tends to press against the braking face. The operating member is pressed, rotating toward the side where the reverse brake lever is located. The reverse brake lever then presses the end of the second driving member away from the brake assembly. Since the reverse brake lever and the brake assembly are located on either side of the second driving member's pivot point, the side acting on the brake assembly lifts the assembly, separating it from the brake face of the core assembly strip. The operating element is released, the braking force drives the first driving element to press down on the braking assembly, and the braking assembly acts on the second driving element while pressing the braking face of the tape core assembly, so that the second driving element is reset. Furthermore, the measuring tape includes a guide groove adapted to the brake assembly. One side end of the brake assembly slides into the guide groove. Specifically, both side ends of the brake assembly are clamped into the guide groove. The guide groove is used to guide the braking assembly so that it is near or far from the braking face of the tape core assembly. The guide groove is arranged to provide a path of movement for the brake assembly, so that the brake assembly can be smoother and more stable when moving. Since both ends of the brake assembly are secured in the guide groove, if a portion of the brake assembly secured in the guide groove is rotatable, during braking, when the brake assembly makes contact with the brake face of the belt core assembly, the belt core assembly will cause the brake assembly to rotate. This rolling friction pressing of the brake assembly and the brake face of the belt core assembly effectively reduces friction loss between the two and increases product lifespan. Furthermore, one end of the guide groove intersects the braking face or its extension surface, and the other end extends away from the braking face toward the tape measure housing side; and along a direction of the guide groove away from the braking face, the guide groove is angled toward the drive assembly side. Since one end of the guide groove intersects the braking face or its extension surface, when the braking assembly moves toward an intersection point of the guide groove, it contacts and presses against the braking face. The other end of the guide groove extends toward the tape measure housing side, away from the braking face, and the braking assembly is separated from the braking face when it is at a distal section. Since the guide groove is angled toward the brake assembly, a V-shaped included angle is formed between the guide groove and the brake face of the belt core assembly. The connecting line between the two ends of the guide groove is called the groove axis. The angle between the tangent of the intersection of the groove axis and the belt core assembly, and the groove axis itself, is a V-shaped included angle. When the drive assembly is in the braked position, the brake assembly moves toward the bottom of the guide groove to make contact with the brake face of the belt core assembly and press it against it. Due to the existence of the V-shaped included angle, the more the brake assembly and the belt core assembly are pressed against each other, the greater the pressure force between them, allowing the rotation of the belt core assembly to be stopped quickly.When the drive assembly is far from the braking position, the braking assembly moves toward the guide groove head, so that the braking assembly separates from the belt core assembly, and the belt core assembly rotates freely. Additionally, the guide slot is provided on an inner side wall of the tape measure housing. In addition, the drive assembly is provided with a guide member, and the guide member is provided with the guide groove. IVIA / a / ZUZZ / UI or In addition, the braking assembly is a circular shaft or a specially shaped shaft. By adopting the circular shaft, the friction between it and the belt core assembly can be carried out as rolling friction, effectively reducing friction loss between the two and increasing the product's lifespan. When a specially shaped shaft is used, the braking assembly adopts a wedge-shaped shaft design. With this design, only one end of the guide groove needs to intersect the braking face or its extension surface, while the other end extends toward the side of the measuring tape housing, away from the braking face. Furthermore, the braking assembly is provided with a tooth-like structure in a corresponding position in contact with the braking face of the tape core assembly; or the braking face of the tape core assembly is provided with a tooth-like structure in a corresponding position in contact with the braking assembly. This increases the frictional force between the braking assembly and the braking face of the tape core assembly. Of course, an optical axis structure can also perform the braking of the tape core assembly. When a circular shaft is adopted, the tooth-shaped structure of the braking face of the belt core assembly adopts an arc-shaped groove that matches the circular shaft. In addition, the braking face of the belt core assembly is formed as the outer circumferential surface of the belt core assembly, or the braking face of the belt core assembly is formed as a lateral circumferential surface that protrudes outward from the side of the belt core assembly. In addition, the measuring tape comprises a lower measuring tape branch installed at the tape outlet to support the lower surface of the tape belt assembly, so that the tape belt assembly can be pulled more smoothly. Compared to the prior art, the present invention has the following beneficial effects: (1) The measuring tape of the present invention adopts the braking assembly that comes into contact with the outer circumference of the tape core assembly and presses it to perform the braking of the measuring tape, which effectively prevents the formation of indentations on the surface of the tape, the belt from becoming confused due to friction and effectively prolongs the product's service life. (2) The measuring tape of the present invention adopts a circular shaft to change the friction force between the braking assembly and the tape core assembly to rolling friction, effectively reducing friction loss between the two. (3) The measuring tape of the present invention is provided with a guide groove, so that the sliding of the braking assembly is more stable. (4) The guide groove of the measuring tape of the present invention is inclined toward the side of the braking assembly, so that an included V-shaped angle is formed between the guide groove and the tape core assembly. When the braking assembly is in the braking position, the more the brake assembly and the tape core assembly are pressed together, the greater the pressure force between the two, so that the rotation of the tape core assembly can be stopped quickly. (5) The braking assembly of the measuring tape of the present invention and its matching parts are arranged compactly, and the space required for the braking assembly to perform the conversion between braking and non-braking is small, so the measuring tape of the present invention can be made with a smaller volume. BRIEF DESCRIPTION OF THE FIGURES Figure 1 is a schematic diagram of a three-dimensional structure of a measuring tape according to the present invention; Figure 2 is a schematic diagram of an internal structure of a measuring tape according to Modality 1 of the present invention; Figure 3 is a simplified schematic diagram of the internal structure of the measuring tape according to Modality 1 of the present invention; Figure 4 is a schematic diagram of an internal structure of a measuring tape according to Modality 2 of the present invention; Figure 5 is a schematic diagram of an ordered exploded structure of the measuring tape according to Modality 2 of the present invention; Figure 6 is a schematic structural diagram of the measuring tape according to the present invention, wherein an elastic member is a compression spring; Figure 7 is a simplified schematic diagram of the internal structure of the measuring tape according to Modality 2 of the present invention; Figure 8 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, wherein a braking assembly is separated from a braking face; Figure 9 is a schematic structural diagram of a tape core assembly according to the present invention, wherein a braking face is an outer circumference; Figure 10 is a schematic structural diagram of a tape core assembly according to the present invention, wherein a braking face is a lateral circumference; Figure 11 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, wherein a braking face is a lateral circumference; Figure 12 is a simplified structural schematic diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking face is the lateral circumference; Figure 13 is a structural schematic diagram of a braking assembly according to Modality 2 of the present invention, which is a circular shaft; Figure 14 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking assembly is a specially shaped shaft; Figure 15 is a simplified structural schematic diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking assembly is the specially shaped shaft; Figure 16 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking face (outer circumferential surface) is a tooth-shaped structure and is an arc-shaped groove; Figure 17 is a simplified structural schematic diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking face (outer circumferential surface) is the tooth-shaped structure and is the arc-shaped groove; Figure 18 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking face (lateral circumferential surface) is a tooth-shaped structure and is an arc-shaped groove; Figure 19 is a simplified structural schematic diagram of the measuring tape according to Modality 2 of the present invention, wherein the braking face (lateral circumferential surface) is the tooth-shaped structure and is the arc-shaped groove; Figure 20 is a schematic structural diagram of the measuring tape according to Modality 2 of the present invention, in which a guide groove is arranged in a drive assembly; Figure 21 is a structural schematic diagram of a tape measure housing according to the present invention when a drive assembly is installed in a sliding manner; Figure 22 is a schematic diagram of a matching structure of a tape measure housing and a drive assembly according to the present invention when the drive assembly is installed in a sliding manner; and Figure 23 is a schematic diagram of a structure according to Modality 3 of the present invention. Reference markings: 1 measuring tape housing; 101 fastening element of the second elastic element; 102 drive assembly groove; 1021 sliding rail stop; 1022 support block; 2 tape core assembly; 201 braking face; 3 tape belt assembly; 4 braking assembly; 5 drive assembly; 501 first drive member; 502 second drive member; 503 operating member; 504 fastening element of the first elastic element; 505 connecting member; 5051 clamping block; 5052 support arm; 5052a bayonet; 506 reverse brake lever; 507 connecting member; 6 elastic member; 601 first fixing ring; 602 second fixing ring; 7 guide groove; 8 V-shaped included angle; and 9 lower measuring tape branch. DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Specific implementations of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments. The following embodiments are intended to illustrate the present invention, but do not limit its scope. Mode 1 As shown in Figures 1 to 3, a measuring tape comprises a measuring tape housing 1 provided with an accommodating cavity, a tape core assembly 2 disposed in the accommodating cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The measuring tape housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outwards. The measuring tape comprises a braking assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted in the measuring tape housing 1, the tape core assembly 2 is provided with a braking face 201, and in a state where the drive assembly 5 is moved to a braking position, the drive assembly 5 drives the braking assembly 4 to contact the braking face 201 of the tape core assembly 2 and press it against the braking face, thereby effecting the braking. In the measuring tape, the assembly may include a single piece or a plurality of pieces. The braking assembly 4 works such that when the braking assembly 4 is in the braking position, the braking assembly 4 comes into contact with the braking face 201 of the tape core assembly 2 and presses it, and the tape core assembly 2 is restricted to stop rotating; otherwise, when the braking assembly 4 is far from the braking position, the braking assembly 4 and the braking face 201 of the tape core assembly 2 do not press against each other and the tape core assembly 2 can rotate freely. Preferably, the measuring tape comprises an elastic member 6 acting on the drive assembly 5, wherein an action force of the elastic member 6 causes the drive assembly 5 to tend to move to the braking position. As shown in Figure 2, one end of the elastic element 6 is connected and fixed to the drive assembly 5, and the other end is connected and fixed to the measuring tape housing 1. Specifically, the drive assembly 5 is provided with a first elastic member fixing member 504, the first elastic member fixing member 504 being a fixing hook, and a connecting end of the elastic member 6 and the drive assembly 5 is provided with a first fixing ring 601 that is paired with the first elastic member fixing member 504 and sleeved in the first elastic member fixing member 504.The measuring tape housing 1 is provided with a second fixing member of the elastic member 101, the second fixing member of the elastic member 101 is a fixing column, and a connecting end of the elastic member 6 and the measuring tape housing 1 is provided with a second fixing ring 602 that is paired with the second fixing member of the elastic member 101 and is sleeved in the second fixing member of the elastic member 101. When the drive assembly 5 is far from the braking position, the elastic member 6 is in either a stretched or compressed state. As shown in Figure 2, when the elastic member 6 is in the stretched state, it tends to return to its original state, so the elastic force generated by the elastic member pulls the drive assembly 5 to move it to the braking position. Referring to Figure 6, when the elastic member 6 is in the compressed state, the IVIA / a / ZUZZ / UI or elastic member 6 wants to return to its original state, so the elastic force generated by the elastic member pushes the driving assembly 5 to move to the braking position. The elastic member 6 adopts a spring. Preferably, the drive assembly 5 is slidably mounted in the tape measure housing 1, and along a direction from the braking position to away from the braking position, a distance between an inner wall of the tape measure housing 1 where the drive assembly 5 is disposed and the braking face 201 of the tape core assembly 2 is adjusted to change from small to large. Preferably, the braking assembly 4 is connected to the drive assembly 5. With the above structure, the braking assembly 4 moves synchronously with the driving assembly 5. When the driving assembly 5 is in the braking position, the braking assembly 4 makes contact with the braking face 201 of the tape core assembly 2 and presses against it, thus restricting the tape core assembly 2 from rotating. When the braking assembly 4 moves away from the braking position, as the distance between the tape measure housing 1 and the tape core assembly 2 changes from small to large, the braking assembly 4 moves from a small distance to a large distance, and the braking assembly 4 separates from the braking face 201 of the tape core assembly 2, allowing the tape core assembly 2 to rotate freely. Preferably, the braking assembly 4 is a wedge-shaped element, the driving assembly 5 extends from the measuring tape housing 1 to form an operating element 503, and the braking assembly 4 is connected to the operating element 503 via a connecting element 507. In another embodiment, the driving assembly 5 is integrally molded with the braking assembly 4. Operating member 503 is used by an operator to operate the drive assembly 5. Preferably, the braking face 201 of the tape core assembly 2 is formed as the outer circumferential surface of the tape core assembly 2, or the braking face 201 of the tape core assembly 2 is formed as a lateral circumferential surface projecting outward from the side of the tape core assembly 2. Preferably, the measuring tape comprises a lower measuring tape branch 9 installed at the tape outlet to support the lower surface of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled more smoothly. Mode 2 As shown in Figures 1 and 4-20, a measuring tape comprises a measuring tape housing 1 provided with an accommodating cavity, a tape core assembly 2 disposed in the accommodating cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The measuring tape housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outward. The measuring tape comprises a braking assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted in the measuring tape housing. IVIA / a / ZUZZ / UI or 1, the central belt assembly 2 is provided with a braking face 201, and in a state in which the drive assembly 5 moves to a braking position, the drive assembly 5 drives the braking assembly 4 to make contact with the braking face 201 of the belt core assembly 2 and press it, thereby performing the braking. In the measuring tape, the assembly may include a single piece or a plurality of pieces. The braking assembly 4 works such that when the braking assembly 4 is in the braking position, the braking assembly 4 comes into contact with the braking face 201 of the tape core assembly 2 and presses it, and the tape core assembly 2 is restricted to stop rotating; otherwise, when the braking assembly 4 is far from the braking position, the braking assembly 4 and the braking face 201 of the tape core assembly 2 do not press against each other and the tape core assembly 2 can rotate freely. Preferably, the measuring tape comprises an elastic member 6 acting on the drive assembly 5, wherein an action force of the elastic member 6 causes the drive assembly 5 to tend to move to the braking position. When the drive assembly 5 is far from the braking position, the elastic member 6 is in a stretched or compressed state, generating an elastic force that acts on the drive assembly 5, causing it to tend to move to the braking position. The elastic member 6 functions as a spring. Preferably, the drive assembly 5 comprises a first drive element 501 acting on the braking assembly 4, the first drive element 501 being arranged to one side of the braking assembly 4, and in a state in which the drive assembly 5 is moved to the braking position, the first drive element 501 drives the braking assembly 4 to make contact with the outer circumferential braking face 201 of the tape core assembly 2 and presses it. The drive assembly 5 is slidably mounted in the tape measure housing 1. When the drive assembly 5 moves to the braking position, the first drive element 501 drives the brake assembly 4 into contact with the braking face 201 of the belt core assembly 2. The first drive element 501 presses the brake assembly 4 and transmits force to the brake assembly 4, so that the brake assembly 4 and the braking face 201 of the belt core assembly 2 are pressed against each other, and the belt core assembly 2 is restrained from rotating. When the drive assembly 5 is far from the braking position, the first drive element 501 does not press down on the brake assembly 4, and the brake assembly 4 and the belt core assembly 2 are not pressed against each other to allow free rotation of the belt core assembly 2. Preferably, the driving assembly 5 comprises a second driving element 502 acting on the braking assembly 4, wherein the second driving element 502 is arranged on a side opposite the first driving element 501. Since the second driving element 502 is arranged on the opposite side from the first driving element 501, i.e., the other side of the braking assembly 4, when the driving assembly 5 is IVIA / a / ZUZZ / UI or away from the braking position, the second driving element 502 drives the braking assembly 4 away from the braking face 201 of the belt core assembly 2, so that the braking assembly 4 separates from the braking face 201 of the belt core assembly 2. When the belt core assembly 2 rotates freely, the contact between the belt is reduced between the core assembly 2 and the braking assembly 4, which reduces loss and prolongs service life. Specifically, the drive assembly 5 protrudes towards the braking face side 201 of the tape core assembly 2 to form the first drive member 501 and the second drive member 502, and a movable space is formed to accommodate the braking assembly 4 between the first drive member 501 and the second drive member 502. As shown in Figures 21 and 22, preferably, the measuring tape housing 1 is provided with a drive assembly groove 102, and the drive assembly 5 is slidably arranged in the drive assembly groove 102. The drive assembly groove 102 is provided with sliding rail stops 1021 on both sides of the braking position and is provided with support blocks 1022 on the side opposite the braking position. The drive assembly 5 comprises an operating member 503 formed from the drive assembly groove 102 and extending out of the measuring tape housing, a drive portion located in the measuring tape housing, and a connecting portion 505 for connecting the drive portion and the operating member 503. The connecting portion 505 comprises a clamping block 5051 and a support arm 5052.The clamping block 5051 is recessed inwardly relative to the operating member 503 and the drive portion, and the connecting portion 505 extends on both sides of the tape measure housing and is in contact with the edge of the drive assembly groove 102 to form the support arm 5052. The support arm 5052 is provided with a bayonet 5052a matched with the edge of the drive assembly groove 102 at the contact between the support arm 5052 and the edge of the drive assembly groove 102. Specifically, the driving portion comprises a first driving element 501 and a second driving element 502. The first driving element 501 and the second driving element 502 protrude from the connecting portion 505. A movable space is formed between the first driving member 501 and the second driving member 502 to accommodate the braking assembly 4. The support arm 5052 is formed on the side of the first driving member 501. During assembly, the clamping block 5051 of the connecting part 505 is clamped between the stops of the sliding rail 1021 on both sides of the groove of the drive assembly 102. Since the clamping block 5051 is recessed inward relative to the operating member 503 and the drive part, a sliding rail groove is formed that matches the protrusions 1021 of the sliding rail, so that the drive assembly 5 is slidably clamped in the groove of the drive assembly 102. The support block 1022 arranged in the groove of the drive assembly 102 is used to hold the operating member 503 away from the braking position side when the drive assembly 5 is slid. IVIA / a / ZUZZ / UI or The support arm 5052 is in contact with the edge of the drive mount groove 102, so that the drive mount 5 slides more stably and smoothly. Preferably, the measuring tape comprises a guide groove 7 that matches the braking assembly 4. A side end of the braking assembly 4 is slidably held in the guide groove 7. Specifically, both side ends of the brake assembly 4 are secured in the guide groove 7. Guide slot 7 is used to guide brake assembly 4 to be near or far from the brake face 201 of tape core assembly 2. Guide groove 7 is arranged to provide a path of movement for brake assembly 4, so that brake assembly 4 can be smoother and more stable when moving. Since both ends of the braking assembly 4 are secured in the guide groove 7, if a portion of the braking assembly 4 secured in the guide groove 7 is rotatable, during braking, when the braking assembly 4 comes into contact with the braking face 201 of the belt core assembly 2, the belt core assembly 2 will cause the braking assembly 4 to rotate. This rolling friction pressing of the braking assembly 4 and the braking face 201 of the belt core assembly 2 effectively reduces friction loss between the two and increases product lifespan. Preferably, one end of the guide groove 7 intersects the braking face 201 or its extension surface, and the other end extends away from the braking face 201 towards the tape measure housing side 1; and along a direction of the guide groove 7 away from the braking face 201, the guide groove 7 is angled towards the drive mount side 5. Since one end of the guide groove 7 intersects the braking face 201 or its extension surface, when the braking assembly 4 moves toward an intersecting end of the guide groove 7, it contacts and presses against the braking face 201. The other end of the guide groove 7 extends toward the side of the measuring tape housing 1 away from the braking face 201, and the braking assembly 4 is separated from the braking face 201 when it is in a distal section. As shown in Figure 7, since the guide slot 7 is angled toward the brake assembly 4, a V-shaped included angle 8 is formed between the guide slot 7 and the braking face 201 of the tape core assembly 2. The connecting line between the two ends of the guide slot 7 is called the slot axis. An included angle between the tangent of the intersection of the slot axis and the tape core assembly 2 and the slot axis is a V-shaped included angle 8. When the drive assembly 5 is in the braking position, the brake assembly 4 moves toward the bottom of the guide slot 7 so that it contacts and presses against the braking face 201 of the tape core assembly 2.Due to the existence of the included V-shaped angle 8, the more the braking assembly 4 and the tape core assembly 2 are pressed together, the greater the pressure force between the two, so that the rotation of the tape core assembly 2 can be stopped quickly. IVIA / a / ZUZZ / UI or When the drive assembly 5 is far from the braking position, the braking assembly 4 moves towards the head of the guide groove 7, so that the braking assembly 4 separates from the tape core assembly 2, and the tape core assembly 2 rotates freely. Preferably, the guide slot 7 is provided on an inner side wall of the measuring tape housing 1. As shown in Figure 20, preferably, the drive assembly 5 is provided with a guide member, and the guide member is provided with the guide groove 7. Preferably, the braking assembly 4 is a circular shaft or a specially shaped shaft. By adopting a circular shaft, the friction between it and the tape core assembly 2 can be achieved through rolling friction, effectively reducing friction losses between the two and increasing the product's lifespan. As shown in Figure 13, the circular shaft at the top of the figure is a toothed shaft, and the circular shaft at the bottom of the figure is an optical shaft. As shown in Figures 14 and 15, when the specially shaped shaft is adopted, the braking assembly 4 adopts a wedge-shaped shaft design. When the wedge-shaped shaft is adopted, only one end of the guide groove 7 needs to pass through the braking face 201 or its extension surface, and the other end extends toward the side of the measuring tape housing 1 away from the braking face 201. Preferably, as shown in the upper part of Figure 13, the braking assembly 4 is provided with a tooth-like structure in a corresponding position in contact with the braking face 201 of the tape core assembly 2; or the braking face 201 of the tape core assembly 2 is provided with a tooth-like structure in a corresponding position in contact with the braking assembly 4. As shown in Figures 16 and 17, this increases the frictional force between the braking assembly 4 and the braking face 201 of the tape core assembly 2. Of course, an optical axis structure can also perform the braking of the tape core assembly 2. As shown in Figures 16-19, when a circular shaft is adopted, the tooth-shaped structure of the braking face 201 of the tape core assembly 2 adopts an arc-shaped groove that fits the circular shaft. Preferably, the braking face 201 of the tape core assembly 2 is formed as the outer circumferential surface of the tape core assembly 2, or the braking face 201 of the tape core assembly 2 is formed as a lateral circumferential surface projecting outward from the side of the tape core assembly 2. The braking face 201 of the tape core assembly 2 adopts a tooth-shaped structure; that is, the outer circumference or lateral circumferential surface of the tape core assembly 2 adopts a tooth-shaped structure. As shown in Figures 16-19, when a circular shaft is adopted, the tooth-shaped structure of the braking face 201 of the tape core assembly 2 adopts an arc-shaped groove that matches the circular shaft; that is, the outer circumference or the side of the circumferential surface of the tape core assembly 2 adopts an arc-shaped groove that fits the circular shaft. Preferably, the measuring tape comprises a lower measuring tape branch 9 installed at the tape outlet to support the lower surface of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled more smoothly. Mode 3 As shown in Figures 1 and 23, a measuring tape comprises a measuring tape housing 1 provided with an accommodating cavity, a tape core assembly 2 disposed in the accommodating cavity, and a tape belt assembly 3 wound around the tape core assembly 2. The measuring tape housing 1 is further provided with a tape outlet for the tape belt assembly 3 to extend outwards. The measuring tape comprises a braking assembly 4 and a drive assembly 5. The drive assembly 5 is movably mounted in the measuring tape housing 1, the tape core assembly 2 is provided with a braking face 201, and in a state where the drive assembly 5 is moved to a braking position, the drive assembly 5 drives the braking assembly 4 to contact the braking face 201 of the tape core assembly 2 and press it against the braking face, thereby effecting the braking action. In the measuring tape, the assembly may include a single piece or a plurality of pieces. Preferably, the measuring tape comprises an elastic member 6 acting on the drive assembly 5, where an action force of the elastic member 6 causes the drive assembly 5 to tend to move to the braking position. The elastic member 6 is a spring. Preferably, the drive assembly 5 comprises a first drive element 501 acting on the braking assembly 4, the first drive element 501 being arranged to one side of the braking assembly 4, and in a state in which the drive assembly 5 is moved to the braking position, the first drive element 501 drives the braking assembly 4 to make contact with the outer circumferential braking face 201 of the tape core assembly 2 and presses it. Preferably, the driving assembly 5 comprises a second driving element 502 acting on the braking assembly 4, wherein the second driving element 502 is arranged on a side opposite the first driving element 501. Preferably, the first driving element 501 and the second driving element 502 are rotatably arranged in the tape measure housing 1. One end of the first driving element 501 acts on one side of the braking assembly 4, and one end of the second driving element 502 acts on the other side of the braking assembly 4. A braking force is applied to the first driving element 501, and this force acts on the first driving element 501 to press down on the brake assembly 4, so that the brake assembly 4 always tends to contact the braking face 201 of the tape core assembly 2 and press against it. When the tape measure is in a reverse braking state, a reverse braking force is applied to the second driving element 502.The reverse braking force acts on the second driving element 502 to cause it to lift the brake assembly 4, so that the brake assembly is separated from the braking face 201 of the tape core assembly 2. Specifically, the first driving element 501 and the second driving element 502 adopt a plate-like structure, and the braking force acts between a pivot point of the first driving element 501 and a contact end with the braking assembly 4. The reverse braking force acts on an end of the second driving element 502 away from the braking assembly 4, and a pivot point of the second driving element 502 is between the reverse braking force and the braking assembly 4. More specifically, one end of the elastic element 6 is fixed between the pivot point of the first drive element 501 and the contact end with the braking assembly 4 to provide braking force. The drive assembly 5 comprises an operating element 503, the operating element 503 is rotatably arranged in the measuring tape housing 1, one end of the operating element 503 is provided with a reverse brake lever 506, and the reverse brake lever 506 acts on the side of the second drive element 502 away from the braking assembly 4 to provide a reverse braking force. The elastic member 6 acts on the first driving member 501. Since the point of action is located between the point of rotation and the contact end with the braking assembly 4, the contact end of the first driving member 501 with the braking assembly 4 rotates towards the side near the braking assembly 4 to press down on the braking assembly 4, so that the braking assembly 4 always tends to press against the braking face 201. The pivot point of the operating element 503 and the reverse brake lever 506 are located at opposite ends of the operating element. Therefore, when the operating element 503 is pressed, it rotates toward the side where the reverse brake lever 506 is located, and the reverse brake lever 506 presses the end of the second drive member 502 away from the brake assembly 4. Since the reverse brake lever 506 and the brake assembly 4 are located on either side of the pivot point of the second drive element 502, the side acting on the brake assembly 4 lifts the brake assembly 4, so that the brake assembly 4 separates from the brake assembly face 201 of the belt core assembly 2. The operating element 503 is released, the braking force drives the first driving element 501 to press down on the brake assembly 4, and the brake assembly 4 acts on the second driving element 502 while pressing on the braking face 201 of the tape core assembly 2, so that the second driving element 502 is reset. Preferably, the measuring tape comprises a guide groove 7 that matches the braking assembly 4. A side end of the braking assembly 4 is slidably held in the guide groove 7. Specifically, both side ends of the brake assembly 4 are secured in the guide groove 7. Preferably, one end of the guide groove 7 intersects the braking face 201 or its extension surface, and the other end extends away from the braking face 201 towards the tape measure housing side 1; and along a direction of the guide groove 7 away from the braking face 201, the guide groove 7 is inclined towards the drive assembly side 5. Since the guide groove 7 is inclined towards the braking assembly side 4, a V-shaped included angle 8 is formed between the guide groove 7 and the braking surface 201 of the tape core assembly 2. Preferably, the guide slot 7 is provided on an inner side wall of the measuring tape housing 1. Preferably, the drive assembly 5 is provided with a guide member, and the guide member is provided with the guide groove 7. Preferably, the braking assembly 4 is a circular shaft or a specially shaped shaft. Preferably, the braking assembly 4 is provided with a tooth-like structure in a corresponding position in contact with the braking face 201 of the tape core assembly 2; or the braking face 201 of the tape core assembly 2 is provided with a tooth-like structure in a corresponding position in contact with the braking assembly 4. In this way, the frictional force between the braking assembly 4 and the braking face 201 of the tape core assembly 2 is increased. Of course, an optical axis structure can also perform the braking of the tape core assembly 2. Preferably, the braking face 201 of the tape core assembly 2 is formed as the outer circumferential surface of the tape core assembly 2, or the braking face 201 of the tape core assembly 2 is formed as a lateral circumferential surface projecting outward from the side of the tape core assembly 2. Preferably, the measuring tape comprises a lower measuring tape branch 9 installed at the tape outlet to support the lower surface of the tape belt assembly 3, so that the tape belt assembly 3 can be pulled more smoothly. The foregoing are merely preferred embodiments of the present invention. It should be noted that various improvements and modifications can be made to a person skilled in the art without departing from the technical principles of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

CLAIMS 1 A measuring tape comprising a measuring tape housing (1) provided with an accommodating cavity, a tape core assembly (2) disposed in the accommodating cavity, and a tape belt assembly (3) wound around the tape core assembly (2), the measuring tape housing (1) being further provided with a tape outlet for the tape belt assembly (3) to extend outwards, characterized in that: the measuring tape comprises a braking assembly (4) and a driving assembly (5), the driving assembly (5) being movably mounted in the measuring tape housing (1), the tape core assembly (2) being provided with a braking face (201), and in a state in which the driving assembly (5) is moved to a braking position, the driving assembly (5) drives the braking assembly (4) to contact the braking face (201) of the tape core assembly (2) and press the same,thus performing the braking; 2.- The measuring tape according to claim 1, characterized in that: the measuring tape comprises an elastic element (6) acting on the drive assembly (5), wherein an action force of the elastic element (6) causes the drive assembly (5) to tend to move to the braking position.

3. The measuring tape according to claim 1, characterized in that: the drive assembly (5) is slidably mounted in the measuring tape housing (1), and along a direction from the braking position outwards from the braking position, a distance between an inner wall of the measuring tape housing (1) where the drive assembly (5) is disposed and the braking face (201) of the tape core assembly (2) is configured to change from small to large. 4.- The measuring tape according to claim 1, characterized in that: the brake assembly (4) is connected to the drive assembly (5). 5.- The measuring tape according to claim 1, characterized in that: the braking assembly (4) is a wedge-shaped member.

6. The measuring tape according to claim 1, characterized in that: the drive assembly (5) comprises a first drive element (501) acting on the braking assembly (4), the first drive element (501) being arranged to one side of the braking assembly (4), and in a state in which the drive assembly (5) is moved to the braking position, the first drive element (501) drives the braking assembly (4) to make contact with the outer circumferential braking face (201) of the tape core assembly (2) and press the same. 7.- The measuring tape according to claim 6, characterized in that: the drive assembly (5) comprises a second drive element (502) acting on the braking assembly (4), wherein the second drive element (502) is arranged on a side opposite to the first drive member (501).

8. The measuring tape according to claim 7, characterized in that: the drive assembly (5) protrudes towards the braking face side (201) of the tape core assembly (2) to form the first drive element (501) and the second drive element (502), and a movable space is formed to accommodate the braking assembly (4) between the first drive element (501) and the second drive element (502).

9. The measuring tape according to claim 7, characterized in that: the first driving element (501) and the second driving element (502) are rotatably arranged in the measuring tape housing (1); one end of the first driving element (501) acts on one side of the braking assembly (4), and one end of the second driving element (502) acts on the other side of the braking assembly (4); a braking force is applied to the first driving element (501), and the braking force acts on the first driving element (501) to press down on the braking assembly (4), such that the braking assembly (4) always tends to come into contact with the braking face (201) of the tape core assembly (2) and press down on it; the measuring tape is in a reverse braking state, and a reverse braking force is applied to the second driving element (502);and the reverse braking force acts on the second driving element (502) to cause it to lift the braking assembly (4), so that the braking assembly separates from the braking face (201) of the tape core assembly (2).; 10. The measuring tape according to claim 6, characterized in that: the measuring tape comprises a guide groove (7) adapted to the braking assembly (4); and a lateral end of the braking assembly (4) is slidably held in the guide groove (7). 11.- The measuring tape according to claim 10, characterized in that: one end of the guide groove (7) intersects the braking face (201) or its extension surface, and the other end extends away from the braking face (201) towards the side of the measuring tape housing (1). 12.- The measuring tape according to claim 11, characterized in that: along a direction of the guide groove (7) away from the braking face (201), the guide groove (7) is inclined towards the side of the drive assembly (5).

13. The measuring tape according to claim 10, characterized in that: the guide groove (7) is provided in an inner side wall of the measuring tape housing (1).

14. The measuring tape according to claim 10, characterized in that: the drive assembly (5) is provided with a guide member, and the guide member is provided with the guide groove (7). 15.- The measuring tape according to claim 6, characterized in that: the braking assembly (4) is a circular shaft or a shaft of special shape.

16. The measuring tape according to claim 6, characterized in that: the braking assembly (4) is provided with a tooth-shaped structure in a corresponding position in contact with the braking face of the tape core assembly (2); or the braking face (201) of the tape core assembly (2) is provided with a tooth-shaped structure in a corresponding position in contact with the braking assembly (4). 17 - The measuring tape according to claim 1, characterized in that: the braking surface (201) of the tape core assembly (2) is formed as the outer circumferential surface of the tape core assembly (2), or the braking surface (201) of the tape core assembly (2) is formed as a lateral circumferential surface projecting outwards from the side of the tape core assembly (2).

18. The measuring tape according to claim 1, characterized in that: the measuring tape housing (1) is provided with a drive assembly groove (102), the drive assembly (5) is slidably arranged in the drive assembly groove (102), and the drive assembly groove (102) is provided with sliding rail stops (1021) on both sides of the braking position, and is provided with support blocks (1022) on the side opposite the braking position; the drive assembly (5) comprises an operating member (503) formed from the drive assembly groove (102) and extending out of the measuring tape housing, a drive portion located in the measuring tape housing, and a connecting portion (505) for connecting the drive portion and the operating member (503);and the connecting portion (505) comprises a clamping block (5051) and a support arm (5052), the clamping block (5051) being recessed inwards relative to the operating member (503) and the driving portion, the connecting portion (505) extending on both sides of the tape measure housing and in contact with the edge of the groove of the driving assembly (102) to form the support arm (5052), and the support arm (5052) is provided with a bayonet (5052a) combined with the edge of the groove of the driving assembly (102) at the contact between the support arm (5052) and the edge of the groove of the driving assembly (102).

19. The measuring tape according to claim 10, characterized in that: an installation part of the braking assembly (4) that is held in the guide groove (7) has a rotatable shape, and the braking assembly (4) and the braking face (201) of the tape core assembly (2) are pressed against each other in a rolling manner.

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