COMPOUND BOW

Abstract

A compound bow includes a riser, a limb, a pulley block, a string, a first coupler, a second coupler, a first cable and a second cable, the pulley block includes a pulley for string, a first pulley for cable and a second pulley for cable, the first pulley for cable and the second pulley for cable are located on two sides of the pulley for string respectively, the first coupler is configured to couple or decouple the first pulley for cable and the pulley for string at a set position, the second coupler is configured to couple or decouple the second pulley for cable and the pulley for string in the set position.

Description

TECHNICAL FIELD

The present application relates to the technical field of compound bow, and in particular, to a compound bow.

BACKGROUND ART

A compound bow is mainly composed of a riser, a pulley block, a string, a cable, a limb, a limb pocket and other components, and generally has a three-string structure or a five-string structure. The both are same in principle, namely through the backward pulling and deformation of the string, the kinetic energy, with which the bow is drawn, may be converted into the potential energy, with which the two cables are radially pulled, such that the limb is pulled to store energy. When the string is released, the limb is deformed first, the pulley block is driven to rotate by the cable, such that the string is driven to rebound to shoot an arrow on the string.

By means of the pulley block of the compound bow, a draw force curve may be improved and labor may be saved. A traditional pulley block generally includes a pulley for string and one or two pulleys for cable. The pulley for string and the pulleys for cable are fixedly arranged, which have the same angular speed and different linear speeds. Since the pulley for string and the pulleys for cable have invariable geometries, the draw force curve, the let-off and the efficiency of the pulley block are invariable, therefore, a mutational draw force curve may not be realized in a single shooting loop. In order to save labor at the end, the draw force is inevitably reduced gradually during drawing for anchoring, such a pulley block stores less energy than a pulley block which always maintains calibrated poundage until the anchoring point at the end in an ideal state, such that it is difficult to further improve the efficiency of the compound bow.

SUMMARY

In order to solve the technical problem that the efficiency of an existing compound bow is difficult to further improve, the present disclosure provides a compound bow.

The following technical solution is provided in the present application. A compound bow includes a riser, a limb, a pulley block and a string, an inner end of the limb is provided on the riser, an outer end of the limb is provided with an axle, the pulley block is provided on the axle, the compound bow further includes a first coupler, a second coupler, a first cable and a second cable, the axle is provided with a first cable hanging ring and a second cable hanging ring, the pulley block includes a pulley for string, a first pulley for cable and a second pulley for cable, the first pulley for cable and the second pulley for cable are located on two sides of the pulley for string respectively, the first coupler is configured to keep the first pulley for cable and the pulley for string in a coupled state before the pulley for string is pulled to a set position while decoupling the first pulley for cable and the pulley for string after the pulley for string is pulled to the set position, the first coupler is further configured to keep the first pulley for cable and the pulley for string in a decoupled state before the pulley for string is released to the set position while coupling the first pulley for cable and the pulley for string after the pulley for string is released to the set position, the second coupler is configured to keep the second pulley for cable and the pulley for string in a decoupled state before the pulley for string is pulled to the set position while coupling the second pulley for cable and the pulley for string after the pulley for string is pulled to the set position, and the second coupler is further configured to keep the second pulley for cable and the pulley for string in a coupled state before the pulley for string is released to the set position while decoupling the second pulley for cable and the pulley for string after the pulley for string is released to the set position.

By the above technical solution in the present application, two pulleys for cable are provided, a shift of draw force characteristic curves of the pulley block in a single shooting loop (full bow-released) is realized by switching different pulleys for cable to be coupled with the pulley for string (which belongs to a variable pulley block technology, and a plurality of draw force curves exist in a single shooting loop). The energy storage capacity and the conversion efficiency of the pulley block may be adjusted under specific indexes (pounds, a draw length, or the like) by adjusting the draw force characteristic curves of the two pulleys for cable. The energy storage capacity and the conversion efficiency of the pulley block may be improved when a larger draw force is required by coupling the second pulley for cable and the pulley for string.

Optionally, the compound bow further includes a first reset torsion spring and a second reset torsion spring, the first reset torsion spring is configured to be sleeved on the axle, to attach the first pulley for cable to a first anti-rotation point of the pulley for string and to inhibit a relative movement between the pulley for string and the first pulley for cable, the second reset torsion spring is configured to be sleeved on the axle, to attach the second pulley for cable to a second anti-rotation point of the pulley for string and to inhibit a relative movement between the pulley for string and the second pulley for cable.

By the above technical solution, the pulley for cable may not synchronously rotate along with the pulley for string after decoupling, and in order to ensure that the cable is not loosened, the pulley for cable is still required to continuously rotate along with the pulley for string by a certain angle (synchronous following is not required), so that the reset torsion spring may be pulled. And then, the reset torsion spring resets the pulley for cable during releasing, such that the pulley for cable and the pulley for string are located at the same position again, and at this point, decoupling and coupling may be carried out smoothly.

Optionally, the first coupler and the second coupler are electronic couplers. Optionally, the pulley for string is configured with a first coupling hole and a second coupling hole, the first coupler is provided on the first pulley for cable, the first coupler includes a first electromagnet and a first sensor, the first sensor is configured to detect whether the pulley for string is rotated to the set position, the first electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the first electromagnet into or from the first coupling hole, to couple or decouple the first pulley for cable and the pulley for string, the second coupler is provided on the second pulley for cable, the second coupler includes a second electromagnet and a second sensor, the second sensor is configured to detect whether the pulley for string is rotated to the set position, and the second electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the second electromagnet into or from the second coupling hole, to couple or decouple the second pulley for cable and the pulley for string.

By the above technical solution, functions achieved by a pure mechanical structure may also be achieved, and similar technical effects may be realized.

Optionally, the pulley for string is configured with a first coupling hole and a second coupling hole, the first coupler includes a first lock block, a reset spring for first lock block, a first guide module and a first track transfer block, the first pulley for cable is configured with a receiving hole for first lock block, the first lock block is slidably provided in the receiving hole for first lock block, the first guide module is fixedly provided on the first lock block, the first track transfer block is provided on the axle and configured to drive the first guide module to move when the first pulley for cable rotates, the first guide module then drives the first lock block to slide in the receiving hole for first lock block, the first lock block is configured to be inserted into or withdrawn from the first coupling hole during sliding, to couple or decouple the first pulley for cable and the pulley for string, the reset spring for first lock block is configured to push the first lock block into the first coupling hole, the second coupler includes a second lock block, a reset spring for second lock block, a second guide module and a second track transfer block, the second pulley for cable is configured with a receiving hole for second lock block, the second lock block is slidably provided in the receiving hole for second lock block, the second guide module is fixedly provided on the second lock block, the second track transfer block is provided on the axle and configured to drive the second guide module to move when the second pulley for cable rotates, the second guide module then drives the second lock block to slide in the receiving hole for second lock block, the second lock block is configured to be inserted into or withdrawn from the second coupling hole during sliding, to couple or decouple the second pulley for cable and the pulley for string, and the reset spring for second lock block is configured to push the second lock block into the second coupling hole.

Optionally, the first track transfer block is provided with a first inclined surface, the first guide module is driven to move through the first inclined surface, the second track transfer block is provided with a second inclined surface, and the second guide module is driven to move through the second inclined surface.

By the above technical solution, the rotary motion of the track transfer block is converted into the axial motion of the lock block by a driving force generated by the inclined surface, so as to realize the coupling and decoupling operations, which has a simple structure and a good action repeatability.

Optionally, the compound bow further includes a cable splitter on the riser, the cable splitter includes a mounting base, a first pulley for splitting cable, a second pulley for splitting cable and a third pulley for splitting cable, the first pulley for splitting cable, the second pulley for splitting cable and the third pulley for splitting cable are arranged on the mounting base in a triangular shape, the string is hooked on a string post of the pulley for string, a first end of the first cable is hooked on a cable post of the first pulley for cable, a second end of the first cable is hooked on the first cable hanging ring, the first cable is further hooked on the first pulley for splitting cable in a middle of the first cable, a first end of the second cable is hooked on a cable post of the second pulley for cable, a second end of the second cable is hooked on the second cable hanging ring, and the second cable is further hooked on the second pulley for splitting cable and the third pulley for splitting cable in a middle of the second cable.

By the above technical solution, the cable splitter is provided to prevent excessive cables in a system from interfering with the string, the holding of the riser and an arrow motion path. The cable splitter may also balance the stress on the axle by a plurality of pulleys for cable. Because of the symmetrical distribution of the pulleys for cable, the phenomenon that the limb is deflected due to asymmetric distribution of the draw force on the axle by the cables through the pulleys for cable, which causes the deflection of the pulley block and thus affecting the stability and consistency of the compound bow.

Optionally, the string is hooked on a string post of the pulley for string, a first end of the first cable is hooked on a cable post of the first pulley for cable, a second end of the first cable is hooked on the first cable hanging ring, a first end of the second cable is hooked on a cable post of the second pulley for cable, and a second end of the second cable is hooked on the second cable hanging ring.

By adopting the above technical solution, a traditional cable mounting mode is feasible, that is, two ends of the cable are arranged on the pulley blocks at two ends of the compound bow. Some offset structures shall be adopted to avoid disturbing the string, the holding of riser and the arrow motion path.

In summary, the present application may achieve at least one of the following beneficial effects.

• • 1. In the present application, two pulleys for cable are provided, a shift of draw force characteristic curves of the pulley block in a single shooting loop is realized. The energy storage capacity and the conversion efficiency of the pulley block may be adjusted under specific indexes (pounds, a draw length, or the like) by adjusting the draw force characteristic curves of the two pulleys for cable.
  • 2. The reset torsion spring may reset the pulley for cable, such that the pulley for cable and the pulley for string are located at the same position again, at this point, decoupling and coupling may be carried out smoothly.
  • 3. The cable splitter may prevent the excessive cables in a system from interfering with the string, the holding of the riser and the arrow motion path.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts a side view of a compound bow according to a first embodiment of the present application (released state);

FIG. 2 depicts a side view of the compound bow according to the first embodiment of the present application (“full bow”);

FIG. 3 depicts a perspective view of the compound bow according to the first embodiment of the present application;

FIG. 4 depicts a schematic partial diagram of the compound bow according to the first embodiment of the present application;

FIG. 5 schematically depicts the match of a pulley for string and a first pulley for cable in the first embodiment of the present application;

FIG. 6 depicts a schematic exploded structural diagram of the pulley for string and the first pulley for cable in the first embodiment of the present application;

FIG. 7 schematically depicts the match of the first pulley for cable and a first coupler in the first embodiment of the present application;

FIG. 8 partially depicts a top view of the compound bow according to the first embodiment of the present application; and

FIG. 9 partially depicts a top view of a compound bow according to a second embodiment of the present application.

DETAILED DESCRIPTION

The present application will be further described below in details with reference to FIGS. 1 to 9.

First Embodiment

Referring to FIGS. 1 to 3, the embodiment of the present application discloses a compound bow, including a riser 1, a limb 2, a pulley block 3 and a string 4. An inner end of the limb 2 is provided on the riser 1, while an outer end of the limb 2 is provided with an axle 5, and the pulley block 3 is provided on the axle 5. The compound bow further includes a first coupler 6, a second coupler (not shown), a first cable 7 and a second cable 8. A first cable hanging ring 9 and a second cable hanging ring 10 are provided on the axle 5. The pulley block 3 includes a pulley for string 31, a first pulley for cable 32 and a second pulley for cable 33, the first pulley for cable 32 and the second pulley for cable 33 are arranged on two sides of the pulley for string 31 respectively. The first coupler 6 is configured to keep the first pulley for cable 32 and the pulley for string 31 in a coupled state before the pulley for string 31 is pulled to a set position while decoupling the first pulley for cable 32 and the pulley for string 31 after the pulley for string 31 is pulled to the set position, and to keep the first pulley for cable 32 and the pulley for string 31 in a decoupled state before the pulley for string 31 is released to the set position while coupling the first pulley for cable 32 and the pulley for string 31 after the pulley for string 31 is released to the set position. The second coupler is configured to keep the second pulley for cable 33 and the pulley for string 31 in a decoupled state before the pulley for string 31 is pulled to the set position while coupling the second pulley for cable 33 and the pulley for string 31 after the pulley for string 31 is pulled to the set position, and to keep the second pulley for cable 33 and the pulley for string 31 in a coupled state before the pulley for string 31 is released to the set position while decoupling the second pulley for cable 33 and the pulley for string 31 after the pulley for string 31 is released to the set position.

In the present application, two pulleys for cable are provided. A shift of draw force characteristic curves of the pulley block 3 in a single shooting loop (full bow-released) is realized by switching different pulleys for cable to be coupled with the pulley for string 31 (which belongs to a variable pulley block technology, and a plurality of draw force curves exist in a single shooting loop). The energy storage capacity and the conversion efficiency of the pulley block 3 may be adjusted under specific indexes (pounds, a draw length, or the like) by adjusting the draw force characteristic curves of the two pulleys for cable. The energy storage capacity and the conversion efficiency of the pulley block 3 may be improved when a larger draw force is required by coupling the second pulley for cable 33 and the pulley for string 31.

Referring to FIGS. 5 to 7, the pulley for string 31 is configured with a first coupling hole 312 and a second coupling hole 313. The first coupler 6 includes a first lock block 61, a reset spring for first lock block 62, a first guide module 63 and a first track transfer block 64. A receiving hole for first lock block 321 is formed in the first pulley for cable 32, the first lock block 61 is slidably arranged in the receiving hole for first lock block 321. The first guide module 63 is fixedly provided on the first lock block 61. The first track transfer block 64 is provided on the axle 5, and a connection shaft is further provided on the axle 5, the first track transfer block 64 is rotatable around the connection shaft. The first track transfer block 64 is provided with a reset mechanism (for example, a torsion spring), to ensure that the first track transfer block will not interfere with the first lock block 61 after decoupling or coupling. The first track transfer block 64 is configured to drive the first guide module 63 to move when the first pulley for cable 32 rotates, the first guide module 63 then drives the first lock block 61 to slide in the receiving hole for first lock block 321. The first lock block 61 is inserted into or withdrawn from the first coupling hole 312 during sliding, to couple or decouple the first pulley for cable 32 and the pulley for string 31. The reset spring for first lock block 62 is configured to push the first lock block 61 into the first coupling hole 312. The second coupler includes a second lock block, a reset spring for second lock block, a second guide module and a second track transfer block. A receiving hole for second lock block is formed in the second pulley for cable 33, the second lock block is slidably provided in the receiving hole for second lock block. The second guide module is fixedly provided on the second lock block. The second track transfer block is provided on the axle 5 and is configured to drive the second guide module to move when the second pulley for cable 33 rotates, the second guide module then drives the second lock block to slide in the receiving hole for second lock block, and the second lock block is inserted into or withdrawn from the second coupling hole 313 during sliding, to couple or decouple the second pulley for cable 33 and the pulley for string 31. The reset spring for second lock block is configured to push the second lock block into the second coupling hole 313.

Referring to FIG. 7, specifically, a first inclined surface 641 is provided on the first track transfer block 64, and the first guide module 63 is driven to move through the first inclined surface 641. A second inclined surface is provided on the second track transfer block, and the second guide module is driven to move through the second inclined surface. The rotary motion of the track transfer block is converted into the axial motion of the lock block by a driving force generated by the inclined surface, so as to realize the coupling and decoupling operations, which has a simple structure and a good action repeatability.

Since the first coupler 6 and the second coupler have the same implementation structure and the same implementation principle except for different functional angular positions, the second coupler will not be illustrated and described in detail in the present application. The compound bow has an upper pulley block and a lower pulley block, the way for pulling wire may be the same as that of a five-string structure in the existing art, and therefore, the description is not repeated.

In the present embodiment, the compound bow further includes a first reset torsion spring (not shown) and a second reset torsion spring (not shown). The first reset torsion spring is sleeved on the axle 5, to attach the first pulley for cable 32 to a first anti-rotation point 311 of the pulley for string 31 and to inhibit the relative movement between the pulley for string 31 and the first pulley for cable 32. The second reset torsion spring is sleeved on the axle 5, to attach the second pulley for cable 33 to a second anti-rotation point of the pulley for string 31 and to inhibit the relative movement between the pulley for string 31 and the second pulley for cable 33. After decoupling, the pulley for cable may not synchronously rotate along with the pulley for string 31, and in order to ensure that the cable is not loosened, the pulley for cable is still required to continuously rotate along with the pulley for string by a certain angle (synchronous following is not required), so that the reset torsion spring may be pulled. And then, during releasing, the reset torsion spring resets the pulley for cable, such that the pulley for cable and the pulley for string 31 are located at the same position again, and at this point, decoupling and coupling may be carried out smoothly.

Referring to FIGS. 3 and 8, the compound bow further includes a cable splitter 11. The cable splitter 11 is provided on the riser 1 and includes a mounting base 111, a first pulley for splitting cable 112, a second pulley for splitting cable 113 and a third pulley for splitting cable 114. The first pulley for splitting cable 112, the second pulley for splitting cable 113 and the third pulley for splitting cable 114 are arranged on the mounting base 111 in a triangular shape. The string 4 is hooked on a string post 314 of the pulley for string 31, one end of the first cable 7 is hooked on a cable post 322 of the first pulley for cable 32 while the other end of the first cable is hooked on the first cable hanging ring 9, and the first cable 7 is hooked on the first pulley for splitting cable 112 in the middle. One end of the second cable 8 is hooked on a cable post 322 of the second pulley for cable 33 while the other end of the second cable is hooked on the second cable hanging ring 10, and the second cable 8 is respectively hooked on the second pulley for splitting cable 113 and the third pulley for splitting cable 114 in the middle. The cable splitter 11 is provided to prevent excessive cables in a system from interfering with the string 4, the holding of the riser 1 and an arrow motion path. The cable splitter 11 may also balance the stress on the axle 5 by a plurality of pulleys for cable. Because of the symmetrical distribution of the pulleys for cable, the phenomenon that the limb 2 is deflected due to asymmetric distribution of the draw force on the axle 5 by the cables through the pulleys for cable, which causes the deflection of the pulley block 3 and thus affecting the stability and consistency of the compound bow.

Second Embodiment

Referring to FIG. 9, the present embodiment is different from the first embodiment in that the internal and external positions of the second cable hanging ring 10 and the first pulley for cable 32 are interchanged, such that the first cable 7 and the second cable 8 are nearly parallel to each other, resulting in a smaller interference. Since the first pulley for cable 32 and the pulley for string 31 are separated from each other with the second cable hanging ring 10 therebetween, it is necessary to provide a protrusion outwards on a side surface of the pulley for string 31. The protrusion is fitted with the first pulley for cable 32, and the second cable hanging ring 10 is hung on the protrusion. Other structures and beneficial effects are consistent with the first embodiment, and are not repeated herein.

In the present application, a traditional cable mounting mode is feasible, that is, two ends of the cable are arranged on the pulley blocks at two ends of the compound bow. The string is hooked on a string post of the pulley for string, one end of the first cable is hooked on a cable post of the first pulley for cable while the other end of the first cable is hooked on the first cable hanging ring (the pulley block at the other end), one end of the second cable is hooked on a cable post of the second pulley for cable while the other end of the second cable is hooked on the second cable hanging ring (the pulley block at the other end). A specific working principle is consistent with that in the first embodiment, by which some offset structures shall be adopted to avoid disturbing the string, the holding of riser and the arrow motion path.

In the present application, the first coupler and the second coupler may also be electronic couplers, for example, electronic couplers controlled by electromagnets or motors.

When the electronic coupler controlled by an electromagnet is adopted, the solution is specifically described as follows. The pulley for string is configured with a first coupling hole and a second coupling hole. The first coupler is provided on the first pulley for cable, the first coupler includes a first electromagnet and a first sensor, the first sensor is configured to detect whether the pulley for string is rotated to the set position, and the first electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the first electromagnet into or from the first coupling hole, to couple or decouple the first pulley for cable and the pulley for string. The second coupler is provided on the second pulley for cable, the second coupler includes a second electromagnet and a second sensor, the second sensor is configured to detect whether the pulley for string is rotated to the set position, and the second electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the second electromagnet into or from the second coupling hole, to couple or decouple the second pulley for cable and the pulley for string. The present scheme may also achieve the functions in the first embodiment and realize similar technical effects.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, and therefore, equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

LIST OF REFERENCE SIGNS

• • 1 riser
  • 2 limb
  • 3 pulley block
  • 31 pulley for string
  • 311 first anti-rotation point
  • 312 first coupling hole
  • 313 second coupling hole
  • 314 string post
  • 32 first Pulley for cable
  • 321 receiving hole for first lock block
  • 322 cable post
  • 33 second Pulley for cable
  • 4 string
  • 5 axle
  • 6 first coupler
  • 61 first lock block
  • 62 reset spring for first lock block
  • 63 first guide module
  • 64 first track transfer block
  • 641 first inclined surface
  • 7 first cable
  • 8 second cable
  • 9 first cable hanging ring
  • 10 second cable hanging ring
  • 11 cable splitter
  • 111 mounting base
  • 112 first pulley for splitting cable
  • 113 second pulley for splitting cable
  • 114 third pulley for splitting cable

Claims

1. A compound bow, comprising a riser, a limb, a pulley block and a string, wherein an inner end of the limb is provided on the riser, an outer end of the limb is provided with an axle, the pulley block is provided on the axle, the compound bow further comprises a first coupler, a second coupler, a first cable and a second cable, the axle is provided with a first cable hanging ring and a second cable hanging ring, the pulley block comprises a pulley for string, a first pulley for cable and a second pulley for cable, the first pulley for cable and the second pulley for cable are located on two sides of the pulley for string respectively, the first coupler is configured to keep the first pulley for cable and the pulley for string in a coupled state before the pulley for string is pulled to a set position while decoupling the first pulley for cable and the pulley for string after the pulley for string is pulled to the set position, the first coupler is further configured to keep the first pulley for cable and the pulley for string in a decoupled state before the pulley for string is released to the set position while coupling the first pulley for cable and the pulley for string after the pulley for string is released to the set position, the second coupler is configured to keep the second pulley for cable and the pulley for string in the decoupled state before the pulley for string is pulled to the set position while coupling the second pulley for cable and the pulley for string after the pulley for string is pulled to the set position, and the second coupler is further configured to keep the second pulley for cable and the pulley for string in the coupled state before the pulley for string is released to the set position while decoupling the second pulley for cable and the pulley for string after the pulley for string is released to the set position.

2. The compound bow according to claim 1, further comprising a first reset torsion spring and a second reset torsion spring, wherein the first reset torsion spring is configured to be sleeved on the axle to attach the first pulley for cable to a first anti-rotation point of the pulley for string and to inhibit a relative movement between the pulley for string and the first pulley for cable, and the second reset torsion spring is configured to be sleeved on the axle to attach the second pulley for cable to a second anti-rotation point of the pulley for string and to inhibit a relative movement between the pulley for string and the second pulley for cable.

3. The compound bow according to claim 2, wherein the first coupler and the second coupler are electronic couplers.

4. The compound bow according to claim 3, wherein the pulley for string is configured with a first coupling hole and a second coupling hole, the first coupler is provided on the first pulley for cable, the first coupler comprises a first electromagnet and a first sensor, the first sensor is configured to detect whether the pulley for string is rotated to the set position, the first electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the first electromagnet into or from the first coupling hole to couple or decouple the first pulley for cable and the pulley for string, the second coupler is provided on the second pulley for cable, the second coupler comprises a second electromagnet and a second sensor, the second sensor is configured to detect whether the pulley for string is rotated to the set position, and the second electromagnet is configured to act when the pulley for string is rotated to the set position, so as to insert or withdraw an iron core of the second electromagnet into or from the second coupling hole to couple or decouple the second pulley for cable and the pulley for string.

5. The compound bow according to claim 2, wherein the pulley for string is configured with a first coupling hole and a second coupling hole, the first coupler comprises a first lock block, a reset spring for first lock block, a first guide module and a first track transfer block, the first pulley for cable is configured with a receiving hole for first lock block, the first lock block is slidably provided in the receiving hole for first lock block, the first guide module is fixedly provided on the first lock block, the first track transfer block is provided on the axle and configured to drive the first guide module to move when the first pulley for cable rotates, the first guide module then drives the first lock block to slide in the receiving hole for first lock block, the first lock block is configured to be inserted into or withdrawn from the first coupling hole during sliding to couple or decouple the first pulley for cable and the pulley for string, the reset spring for first lock block is configured to push the first lock block into the first coupling hole, the second coupler comprises a second lock block, a reset spring for second lock block, a second guide module and a second track transfer block, the second pulley for cable is configured with a receiving hole for second lock block, the second lock block is slidably provided in the receiving hole for second lock block, the second guide module is fixedly provided on the second lock block, the second track transfer block is provided on the axle and configured to drive the second guide module to move when the second pulley for cable rotates, the second guide module then drives the second lock block to slide in the receiving hole for second lock block, the second lock block is configured to be inserted into or withdrawn from the second coupling hole during sliding to couple or decouple the second pulley for cable and the pulley for string, and the reset spring for second lock block is configured to push the second lock block into the second coupling hole.

6. The compound bow according to claim 5, wherein the first track transfer block is provided with a first inclined surface, the first guide module is driven to move through the first inclined surface, the second track transfer block is provided with a second inclined surface, and the second guide module is driven to move through the second inclined surface.

7. The compound bow according to claim 1, further comprising a cable splitter on the riser, wherein the cable splitter comprises a mounting base, a first pulley for splitting cable, a second pulley for splitting cable and a third pulley for splitting cable, the first pulley for splitting cable, the second pulley for splitting cable and the third pulley for splitting cable are arranged on the mounting base in a triangular shape, the string is hooked on a string post of the pulley for string, a first end of the first cable is hooked on a cable post of the first pulley for cable, a second end of the first cable is hooked on the first cable hanging ring, the first cable is further hooked on the first pulley for splitting cable in a middle of the first cable, a first end of the second cable is hooked on a cable post of the second pulley for cable, a second end of the second cable is hooked on the second cable hanging ring, and the second cable is further hooked on the second pulley for splitting cable and the third pulley for splitting cable in a middle of the second cable.

8. The compound bow according to claim 1, wherein the string is hooked on a string post of the pulley for string, a first end of the first cable is hooked on a cable post of the first pulley for cable, a second end of the first cable is hooked on the first cable hanging ring, a first end of the second cable is hooked on a cable post of the second pulley for cable, and a second end of the second cable is hooked on the second cable hanging ring.