Composite bow

Abstract

A composite bow, comprising a riser (1), limbs (2), a pulley system (3), a main string (4), a first coupler (6), a second coupler, a first auxiliary cable (7) and a second auxiliary cable (8), wherein the pulley system (3) comprises a main string pulley (31), a first auxiliary cable pulley (32) and a second auxiliary cable pulley (33), the first auxiliary cable pulley (32) and the second auxiliary cable pulley (33) being respectively arranged on two sides of the main string pulley (31); the first coupler (6) enables the first auxiliary cable pulley (32) to be coupled to or decoupled from the main string pulley (31) at a set position; and the second coupler enables the second auxiliary cable pulley (33) to be coupled to or decoupled from the main string pulley (31) at a set position.

Description

A compound bow Technical Field

[0001] The present application relates to the technical field of compound bows, and in particular to a compound bow. Background Art

[0002] A compound bow is mainly assembled from components such as a handle, a pulley group, a main string, a secondary cable, a limb, and a limb seat. Generally, there are three-string structures and five-string structures. The principles are the same. Through the backward deformation of the main string, the kinetic energy of the bow is converted into potential energy of radially pulling two secondary cables through the pulley group, and then the limbs are pulled to store energy. When the main string is released, the limbs are deformed first, and the pulley group is driven to rotate through the secondary string, which in turn drives the main string to rebound and shoot the arrow placed on the main string.

[0003] The pulley group of a compound bow can improve the tension curve and achieve an effort-saving effect. A traditional pulley group usually includes a main chord wheel and one or two auxiliary cable wheels. The main chord wheel and the auxiliary cable wheel are fixed, with the same angular velocity and different linear velocity. Since the geometric shapes of the main chord wheel and the auxiliary cable wheel are fixed, the tension curve, effort-saving ratio and pulley group efficiency of the pulley group are also fixed. It is impossible to achieve a sudden change in the tension curve within a single shooting cycle. In order to achieve end-stage effort saving, there must be a process of gradual decrease in tension during the process of pulling to the end position. Such a pulley group stores less energy than the pulley group that maintains the calibrated poundage until the end-stage position in the ideal state, and it is difficult to further improve the performance of the compound bow.

[0004] Summary of the Invention

[0005] In order to solve the technical problem that the performance of existing compound bows is difficult to be further improved, the present invention provides a compound bow.

[0006] The technical solution provided by the present application is as follows: a compound bow, comprising a bow handle, a limb, a pulley group and a main string, wherein the inner end of the limb is arranged on the bow handle, the outer end of the limb is provided with a wheel axle, the pulley group is provided on the wheel axle, the compound bow further comprises a first coupler, a second coupler, a first secondary cable and a second secondary cable, the wheel axle is provided with a first secondary cable hanging ring and a second secondary cable hanging ring; the pulley group comprises a main string wheel, a first secondary cable wheel and a second secondary cable wheel, the first secondary cable wheel and the second secondary cable wheel are respectively arranged on both sides of the main string wheel, the first coupler is used to keep the first secondary cable wheel and the main string wheel in a coupled state before the main string wheel is pulled to a set position , decoupling the first secondary cable pulley from the main chord wheel after the main chord wheel is pulled to the set position, and keeping the first secondary cable pulley in a decoupled state from the main chord wheel before the main chord wheel is released to the set position, and coupling the first secondary cable pulley to the main chord wheel after the main chord wheel is released to the set position; the second coupler is used to keep the second secondary cable pulley in a decoupled state from the main chord wheel before the main chord wheel is pulled to the set position, couple the second secondary cable pulley to the main chord wheel after the main chord wheel is pulled to the set position, and keep the second secondary cable pulley in a coupled state from the main chord wheel before the main chord wheel is released to the set position, and decouple the second secondary cable pulley from the main chord wheel after the main chord wheel is released to the set position.

[0007] By adopting the above-mentioned technical solution, the present application sets up two sets of auxiliary cable pulleys. Within a single shooting cycle (full pull-release), by switching different auxiliary cable pulleys to couple with the main chord wheel, the pulley group tension characteristic curve within a single shooting cycle is transformed (belonging to the variable pulley group technology, with multiple tension curves within a single shooting cycle). By adjusting the tension characteristic curves of the two sets of auxiliary cable pulleys, the energy storage capacity and conversion efficiency of the pulley group can be adjusted under specific indicators (poundage, pull length, etc.). If the tension required when the second auxiliary cable pulley is coupled with the main chord wheel is greater, the energy storage capacity and conversion efficiency of the pulley group can be improved.

[0008] Preferably, the compound bow further includes a first return torsion spring and a second return torsion spring, the first return torsion spring being sleeved on the wheel axle so that the first secondary cable pulley abuts against the first rotation stop point of the main chord wheel and is used to suppress the relative movement between the main chord wheel and the first secondary cable pulley; the second return torsion spring being sleeved on the wheel axle so that the second secondary cable pulley abuts against the second rotation stop point of the main chord wheel and is used to suppress the relative movement between the main chord wheel and the second secondary cable pulley.

[0009] By adopting the above technical solution, after decoupling, the auxiliary cable pulley can no longer rotate synchronously with the main chord pulley. In order to ensure that the auxiliary cable is not loose, the auxiliary cable pulley still needs to continue to rotate at a certain angle (no need to follow synchronously). The reset torsion spring will be pulled open, and then during the release process, the reset torsion spring will reset the auxiliary cable pulley, and the positions of the auxiliary cable pulley and the main chord pulley will be in the same position again. At this time, decoupling and coupling can be carried out smoothly.

[0010] Preferably, the first coupler and the second coupler are electronic couplers.

[0011] Preferably, the main chord wheel is provided with a first coupling hole and a second coupling hole; the first coupler is provided on the first secondary cable pulley, the first coupler includes a first electromagnet and a first sensor, the first sensor is used to detect whether the main chord wheel rotates to a set position, the first electromagnet is used to operate when the main chord wheel rotates to the set position, so that the iron core of the first electromagnet is inserted into or withdrawn from the first coupling hole, so as to couple or decouple the first secondary cable pulley and the main chord wheel; the second coupler is provided on the second secondary cable pulley, the second coupler includes a second electromagnet and a second sensor, the second sensor is used to detect whether the main chord wheel rotates to the set position, the second electromagnet is used to operate when the main chord wheel rotates to the set position, so that the iron core of the second electromagnet is inserted into or withdrawn from the second coupling hole, so as to couple or decouple the second secondary cable pulley and the main chord wheel.

[0012] By adopting the above technical solution, the functions achieved by a purely mechanical structure can also be achieved, and similar technical effects can be obtained.

[0013] Preferably, the main chord wheel is provided with a first coupling hole and a second coupling hole; the first coupler includes a first locking block, a first locking block return spring, a first guide module and a first track changing block, the first secondary cable wheel is provided with a first locking block accommodating hole, the first locking block is slidably arranged in the first locking block accommodating hole, the first guide module is fixedly arranged on the first locking block, the first track changing block is arranged on the wheel axle, and is used to drive the first guide module to move when the first secondary cable wheel rotates. The first guide module then drives the first locking block to slide in the first locking block accommodating hole, and the first locking block is inserted into or exits the first coupling hole when sliding, so that the first secondary cable wheel and the main chord wheel are coupled or decoupled, and the first locking block return spring is used to reset the first locking block. The stop block is pushed into the first coupling hole; the second coupler includes a second locking block, a second locking block return spring, a second guide module and a second track changing block, the second secondary cable pulley is provided with a second locking block accommodating hole, the second locking block is slidably arranged in the second locking block accommodating hole, the second guide module is fixedly arranged on the second locking block, and the second track changing block is arranged on the wheel axle, and is used to drive the second guide module to move when the second secondary cable pulley rotates, and the second guide module then drives the second locking block to slide in the second locking block accommodating hole, and the second locking block is inserted into or exits the second coupling hole when sliding, so that the second secondary cable pulley and the main chord wheel are coupled or decoupled, and the second locking block return spring is used to push the second locking block into the second coupling hole.

[0014] Preferably, the first track-changing block is provided with a first inclined surface, and the first guide module is driven to move by the first inclined surface; the second track-changing block is provided with a second inclined surface, and the second guide module is driven to move by the second inclined surface.

[0015] By adopting the above technical solution, the rotational motion of the track changing block is converted into the axial motion of the locking block through the driving force generated by the inclined surface, thereby realizing coupling and decoupling operations, with a simple structure and good action repeatability.

[0016] Preferably, the compound bow also includes a cable splitting device, which is arranged on the bow handle and includes a mounting seat, a first cable splitting pulley, a second cable splitting pulley and a third cable splitting pulley, the first cable splitting pulley, the second cable splitting pulley and the third cable splitting pulley are all arranged on the mounting seat and distributed in a triangular shape; the main chord is hooked on the main chord hanging head of the main chord wheel, one end of the first auxiliary cable is hooked on the auxiliary cable hanging head of the first auxiliary cable wheel, and the other end is hooked on the first auxiliary cable hanging ring, and the middle part of the first auxiliary cable is also hooked on the first cable splitting pulley; one end of the second auxiliary cable is hooked on the auxiliary cable hanging head of the second auxiliary cable wheel, and the other end is hooked on the second auxiliary cable hanging ring, and the middle part of the second auxiliary cable is also hooked on the second cable splitting pulley and the third cable splitting pulley.

[0017] By adopting the above technical solution, the purpose of setting up a cable splitting device is to avoid excessive interference of the auxiliary cables in the system with the main string, the bow grip and the movement path of the arrow. This cable splitting device can also balance the stress of multiple auxiliary cable wheels acting on the wheel axle. Moreover, since the auxiliary cable wheels are symmetrically distributed, the bow limbs are less likely to be pulled off course due to the asymmetrical distribution of tension exerted by the auxiliary cables on the wheel axle through the auxiliary cable wheels, causing the pulley group to swing and thus affecting the stability and consistency of the compound bow.

[0018] Preferably, the main string is hooked on the main string hanging head of the main string wheel, one end of the first auxiliary cable is hooked on the auxiliary cable hanging head of the first auxiliary cable wheel, and the other end is hooked on the first auxiliary cable hanging ring, and one end of the second auxiliary cable is hooked on the auxiliary cable hanging head of the second auxiliary cable wheel, and the other end is hooked on the second auxiliary cable hanging ring.

[0019] By adopting the above technical solution, it is also feasible to adopt the traditional auxiliary cable installation method, that is, the two ends of the auxiliary cable are set on the pulley groups at both ends of the compound bow, and some offset structures should be adopted to avoid interfering with the main string, the bow grip and the movement path of the arrow.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application sets two sets of auxiliary cable pulleys to achieve the transformation of the pulley group tension characteristic curve within a single shooting cycle. By adjusting the tension characteristic curves of the two sets of auxiliary cable pulleys, the energy storage capacity and conversion efficiency of the pulley group can be adjusted under specific indicators (poundage, pull length, etc.);

[0022] 2. The reset torsion spring can reset the auxiliary cable wheel, and the positions of the auxiliary cable wheel and the main chord wheel are in the same position again. At this time, decoupling and coupling can be carried out smoothly;

[0023] 3. The cable splitter can prevent excessive secondary cables in the system from interfering with the main string, the bow grip, and the arrow's movement path. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 illustrates a side view (relaxed state) of a compound bow according to a first embodiment of the present application;

[0025] FIG2 illustrates a side view of the compound bow according to the first embodiment of the present application (fully drawn);

[0026] FIG3 is a perspective view of the compound bow according to the first embodiment of the present application;

[0027] FIG4 is a partial schematic diagram of the compound bow according to the first embodiment of the present application;

[0028] FIG5 is a schematic diagram illustrating the coordination relationship between the main chord wheel and the first auxiliary cable wheel according to the first embodiment of the present application;

[0029] FIG6 is a schematic diagram of the exploded structure of the main chord pulley and the first auxiliary cable pulley according to the first embodiment of the present application;

[0030] FIG7 illustrates a schematic diagram of the cooperation relationship between the first secondary cable pulley and the first coupler according to the first embodiment of the present application;

[0031] FIG8 illustrates a partial top view of the compound bow according to the first embodiment of the present application;

[0032] FIG9 illustrates a partial top view of the compound bow according to the second embodiment of the present application.

[0033] Explanation of the accompanying drawings: 1. Bow handle; 2. Bow piece; 3. Pulley group; 31. Main string wheel; 311. First rotation stop point; 312. First coupling hole; 313. Second coupling hole; 314. Main string hanging head; 32. First auxiliary cable wheel; 321. First locking block accommodating hole; 322. Auxiliary cable hanging head; 33. Second auxiliary cable wheel; 4. Main string; 5. Wheel axle; 6. First coupler; 61. First locking block; 62. First locking block return spring; 63. First guide module; 64. First track change block; 641. First inclined plane; 7. First auxiliary cable; 8. Second auxiliary cable; 9. First auxiliary cable hanging ring; 10. Second auxiliary cable hanging ring; 11. Cable distribution device; 111. Mounting seat; 112. First cable distribution pulley; 113. Second cable distribution pulley; 114. Third cable distribution pulley. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to Figures 1-9.

[0035] Example 1:

[0036] 1 to 3 , an embodiment of the present application discloses a compound bow, comprising a handle 1, a limb 2, a pulley assembly 3, and a main string 4. The inner end of the limb 2 is arranged on the handle 1, and the outer end of the limb 2 is provided with a wheel axle 5. The pulley assembly 3 is provided on the wheel axle 5. The compound bow further comprises a first coupler 6, a second coupler (not shown), a first secondary cable 7, and a second secondary cable 8. The wheel axle 5 is provided with a first secondary cable hanging ring 9 and a second secondary cable hanging ring 10. The pulley assembly 3 comprises a main string wheel 31, a first secondary cable wheel 32, and a second secondary cable wheel 33. The first secondary cable wheel 32 and the second secondary cable wheel 33 are respectively provided on both sides of the main string wheel 31. The first coupler 6 is used to keep the first secondary cable wheel 32 coupled to the main string wheel 31 before the main string wheel 31 is pulled to a set position. state, decoupling the first secondary cable pulley 32 from the main chord pulley 31 after the main chord pulley 31 is pulled to the set position, and maintaining the first secondary cable pulley 32 and the main chord pulley 31 in the decoupling state before the main chord pulley 31 is released to the set position, and coupling the first secondary cable pulley 32 to the main chord pulley 31 after the main chord pulley 31 is released to the set position; the second coupler is used to maintain the second secondary cable pulley 33 from the main chord pulley 31 in the decoupling state before the main chord pulley 31 is pulled to the set position, and coupling the second secondary cable pulley 33 to the main chord pulley 31 after the main chord pulley 31 is pulled to the set position, and maintaining the second secondary cable pulley 33 and the main chord pulley 31 in the coupled state before the main chord pulley 31 is released to the set position, and decoupling the second secondary cable pulley 33 from the main chord pulley 31 after the main chord pulley 31 is released to the set position.

[0037] The present application sets up two sets of auxiliary cable pulleys. Within a single shooting cycle (full pull-release), by switching different auxiliary cable pulleys to couple with the main chord wheel 31, the pulley group 3 tension characteristic curve is transformed within a single shooting cycle (belonging to the variable pulley group technology, with multiple tension curves within a single shooting cycle). By adjusting the tension characteristic curves of the two sets of auxiliary cable pulleys, the energy storage capacity and conversion efficiency of the pulley group 3 can be adjusted under specific indicators (poundage, pull length, etc.). If the tension required when the second auxiliary cable pulley 33 is coupled with the main chord wheel 31 is greater, the energy storage capacity and conversion efficiency of the pulley group 3 can be improved.

[0038] 5 to 7 , the main chord pulley 31 is provided with a first coupling hole 312 and a second coupling hole 313. The first coupler 6 includes a first locking block 61, a first locking block return spring 62, a first guide module 63, and a first track change block 64. The first auxiliary cable pulley 32 is provided with a first locking block receiving hole 321. The first locking block 61 is slidably disposed within the first locking block receiving hole 321. The first guide module 63 is fixedly disposed on the first locking block 61. The first track change block 64 is disposed on the wheel axle 5. When the first auxiliary cable pulley 32 rotates, it drives the first guide module 63 to move. The first guide module 63 then drives the first locking block 61 to slide within the first locking block receiving hole 321. When the first locking block 61 slides, it inserts into or exits the first coupling hole 312, thereby coupling or decoupling the first auxiliary cable pulley 32 and the main chord pulley 31. The first locking block return spring 62 is used to push the first locking block 61 into the first coupling hole 312. The second coupler includes a second locking block, a second locking block return spring, a second guide module and a second track changing block. The second auxiliary cable pulley 33 is provided with a second locking block accommodating hole. The second locking block is slidably arranged in the second locking block accommodating hole. The second guide module is fixedly arranged on the second locking block. The second track changing block is arranged on the wheel shaft 5. When the second auxiliary cable pulley 33 rotates, it is used to drive the second guide module to move. The second guide module then drives the second locking block to slide in the second locking block accommodating hole. When the second locking block slides, it inserts into or exits the second coupling hole 313 to couple or decouple the second auxiliary cable pulley 33 and the main chord wheel 31. The second locking block return spring is used to push the second locking block into the second coupling hole 313.

[0039] Referring to Figure 7 , the first track-shifting block 64 is provided with a first inclined surface 641, which drives the movement of the first guide module 63. The second track-shifting block is provided with a second inclined surface, which drives the movement of the second guide module. The driving force generated by the inclined surface converts the rotational motion of the track-shifting block into axial motion of the locking block, achieving coupling and decoupling operations. This provides a simple structure and excellent repeatability.

[0040] Since the first coupler 6 and the second coupler have the same structure and the same principle, only the angular position of their operation is different, the second coupler will not be illustrated or described in detail in this application. The compound bow has an upper pulley assembly and a lower pulley assembly, and the cable pulling method can be the same as the cable pulling method of the prior art five-string structure, so no detailed description is given.

[0041] In this embodiment, the compound bow further includes a first return torsion spring (not shown) and a second return torsion spring (not shown). The first return torsion spring is mounted on the axle 5, causing the first secondary cable pulley 32 to abut against the first rotation stop point 311 of the main chord pulley 31 and inhibiting relative movement between the main chord pulley 31 and the first secondary cable pulley 32. The second return torsion spring is mounted on the axle 5, causing the second secondary cable pulley 33 to abut against the second rotation stop point of the main chord pulley 31 and inhibiting relative movement between the main chord pulley 31 and the second secondary cable pulley 33. After decoupling, the secondary cable pulley can no longer rotate synchronously with the main chord pulley 31. To ensure that the secondary cable does not slack, the secondary cable pulley must continue to rotate with the main chord pulley 31 by a certain angle (not necessarily synchronously). This causes the return torsion spring to be pulled. During the release process, the return torsion spring resets the secondary cable pulley, aligning the secondary cable pulley and the main chord pulley 31 again. Decoupling and recoupling can then proceed smoothly.

[0042] 3 and 8 , the composite bow further comprises a cable splitting device 11, which is mounted on the bow handle 1 and includes a mounting seat 111, a first cable splitting pulley 112, a second cable splitting pulley 113, and a third cable splitting pulley 114. The first, second, and third cable splitting pulleys 112, 113, and 114 are all mounted on the mounting seat 111 and arranged in a triangular pattern. The main chord 4 is hooked onto the main chord hook 314 of the main chord wheel 31. The first auxiliary cable 7 is hooked onto the auxiliary cable hook 322 of the first auxiliary cable wheel 32 at one end and onto the first auxiliary cable hook ring 9 at the other end. The middle portion of the first auxiliary cable 7 is also hooked onto the first cable splitting pulley 112. The second auxiliary cable 8 is hooked onto the auxiliary cable hook 322 of the second auxiliary cable wheel 33 at one end and onto the second auxiliary cable hook ring 10 at the other end. The middle portion of the second auxiliary cable 8 is also hooked onto the second cable splitting pulley 113 and the third cable splitting pulley 114. The purpose of providing the cable splitting device 11 is to prevent excessive auxiliary cables in the system from interfering with the main string 4, the bow grip 1 and the movement path of the arrow. This cable splitting device 11 can also balance the stress of multiple auxiliary cable pulleys acting on the wheel axle 5. Moreover, since the auxiliary cable pulleys are symmetrically distributed, the bow limbs 2 are less likely to be pulled off course due to the asymmetrical distribution of tension exerted by the auxiliary cables on the wheel axle 5 through the auxiliary cable pulleys, causing the pulley group 3 to swing and thus affecting the stability and consistency of the compound bow.

[0043] Example 2:

[0044] Referring to Figure 9 , this embodiment differs from the first embodiment in that the second secondary cable eyelet 10 and the first secondary cable pulley 32 are positioned inward and outward, shifting the first and second secondary cables 7 and 8 closer to parallel with each other, minimizing interference. Because the second secondary cable eyelet 10 is located between the first secondary cable pulley 32 and the main chord pulley 31, a protrusion is provided on the side of the main chord pulley 31. The protrusion engages with the first secondary cable pulley 32, and the second secondary cable eyelet 10 is attached to the protrusion. The remaining structures and benefits are consistent with those of the first embodiment and are not further described here.

[0045] In the present application, it is also feasible to adopt a traditional auxiliary cable installation method, that is, the two ends of the auxiliary cable are set on the pulley groups at both ends of the compound bow. The main string is hooked on the main string hanging head of the main string wheel, one end of the first auxiliary cable is hooked on the auxiliary cable hanging head of the first auxiliary cable wheel, and the other end is hooked on the first auxiliary cable hanging ring (the other end pulley group), and one end of the second auxiliary cable is hooked on the auxiliary cable hanging head of the second auxiliary cable wheel, and the other end is hooked on the second auxiliary cable hanging ring (the other end pulley group). The specific working principle is consistent with that of Example 1, and some offset structures should be adopted to avoid interfering with the main string, the bow grip, and the arrow movement path.

[0046] In the present application, the first coupler and the second coupler may also be electronic couplers, such as electronic couplers controlled by electromagnets or motors.

[0047] When an electromagnet-controlled electronic coupler is used, the solution is specifically described as follows: the main chord pulley is provided with a first coupling hole and a second coupling hole; the first coupler is disposed on the first secondary cable pulley and includes a first electromagnet and a first sensor. The first sensor is used to detect whether the main chord pulley has rotated to a set position. The first electromagnet is used to actuate when the main chord pulley rotates to the set position, causing the iron core of the first electromagnet to insert or withdraw from the first coupling hole, thereby coupling or decoupling the first secondary cable pulley and the main chord pulley; the second coupler is disposed on the second secondary cable pulley and includes a second electromagnet and a second sensor. The second sensor is used to detect whether the main chord pulley has rotated to the set position. The second electromagnet is used to actuate when the main chord pulley rotates to the set position, causing the iron core of the second electromagnet to insert or withdraw from the second coupling hole, thereby coupling or decoupling the second secondary cable pulley and the main chord pulley. This solution can also achieve the functions of Example 1 and obtain similar technical effects.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A compound bow, comprising a bow handle (1), a limb (2), a pulley block (3) and a main string (4), wherein the inner end of the limb (2) is arranged on the bow handle (1), the outer end of the limb (2) is provided with a wheel axle (5), and the pulley block (3) is arranged on the wheel axle (5), characterized in that: The composite bow further comprises a first coupler (6), a second coupler, a first secondary cable (7) and a second secondary cable (8); the wheel shaft (5) is provided with a first secondary cable hanging ring (9) and a second secondary cable hanging ring (10); the pulley block (3) comprises a main chord wheel (31), a first secondary cable wheel (32) and a second secondary cable wheel (33); the first secondary cable wheel (32) and the second secondary cable wheel (33) are respectively arranged on both sides of the main chord wheel (31); the first coupler (6) is used to keep the first secondary cable wheel (32) and the main chord wheel (31) coupled before the main chord wheel (31) is pulled to a set position, to decouple the first secondary cable wheel (32) from the main chord wheel (31) after the main chord wheel (31) is pulled to the set position, and to release the first secondary cable wheel (32) from the main chord wheel (31) after the main chord wheel (31) is pulled to the set position. ) is released to a set position to keep the first secondary cable wheel (32) and the main chord wheel (31) in an uncoupled state, and couple the first secondary cable wheel (32) and the main chord wheel (31) after the main chord wheel (31) is released to the set position; the second coupler is used to keep the second secondary cable wheel (33) and the main chord wheel (31) in an uncoupled state before the main chord wheel (31) is pulled to the set position, couple the second secondary cable wheel (33) and the main chord wheel (31) after the main chord wheel (31) is pulled to the set position, and keep the second secondary cable wheel (33) and the main chord wheel (31) in a coupled state before the main chord wheel (31) is released to the set position, and decouple the second secondary cable wheel (33) and the main chord wheel (31) after the main chord wheel (31) is released to the set position.

2. The compound bow according to claim 1, characterized in that: The composite bow further comprises a first return torsion spring and a second return torsion spring, wherein the first return torsion spring is sleeved on the wheel shaft (5) so that the first auxiliary cable wheel (32) abuts against a first rotation stop point (311) of the main chord wheel (31) and is used to suppress the relative movement between the main chord wheel (31) and the first auxiliary cable wheel (32); the second return torsion spring is sleeved on the wheel shaft (5) so that the second auxiliary cable wheel (33) abuts against a second rotation stop point of the main chord wheel (31) and is used to suppress the relative movement between the main chord wheel (31) and the second auxiliary cable wheel (33).

3. The compound bow according to claim 2, characterized in that: The first coupler and the second coupler are electronic couplers.

4. The compound bow according to claim 3, characterized in that: The main chord wheel (31) is provided with a first coupling hole (312) and a second coupling hole (313); the first coupler is arranged on the first auxiliary cable wheel (32), the first coupler comprises a first electromagnet and a first sensor, the first sensor is used to detect whether the main chord wheel (31) rotates to a set position, the first electromagnet is used to operate when the main chord wheel (31) rotates to the set position, so that the iron core of the first electromagnet is inserted into or withdrawn from the first coupling hole (312), so that the first auxiliary cable wheel (32) and the main chord wheel (31) are coupled or decoupled; the second coupler is arranged on the second auxiliary cable wheel (33), the second coupler comprises a second electromagnet and a second sensor, the second sensor is used to detect whether the main chord wheel (31) rotates to the set position, the second electromagnet is used to operate when the main chord wheel (31) rotates to the set position, so that the iron core of the second electromagnet is inserted into or withdrawn from the second coupling hole (313), so that the second auxiliary cable wheel (33) and the main chord wheel (31) are coupled or decoupled.

5. The compound bow according to claim 2, characterized in that: The main chord wheel (31) is provided with a first coupling hole (312) and a second coupling hole (313); the first coupler (6) comprises a first locking block (61), a first locking block (61) reset spring, a first guiding module (63) and a first track changing block (64); the first auxiliary cable wheel (32) is provided with a first locking block receiving hole (321); the first locking block (61) is slidably arranged in the first locking block receiving hole (321); the first guiding module (63) is fixedly arranged on the first locking block (61); the first track changing block (64) is arranged on the wheel shaft (5); when the first auxiliary cable wheel (32) rotates, it is used to drive the first guiding module (63) to move; the first guiding module (63) then drives the first locking block (61) to slide in the first locking block receiving hole (321); when the first locking block (61) slides, it is inserted into or withdrawn from the first coupling hole (312), so that the first auxiliary cable wheel (32) and The main chord wheel (31) is coupled or decoupled, and the first locking block (61) reset spring is used to push the first locking block (61) into the first coupling hole (312); the second coupler includes a second locking block, a second locking block reset spring, a second guide module and a second track change block, the second auxiliary cable wheel (33) is provided with a second locking block accommodating hole, the second locking block is slidably arranged in the second locking block accommodating hole, the second guide module is fixedly arranged on the second locking block, and the second track change block is arranged on the wheel shaft (5). When the second auxiliary cable wheel (33) rotates, it is used to drive the second guide module to move, and the second guide module drives the second locking block to slide in the second locking block accommodating hole. When the second locking block slides, it is inserted into or withdrawn from the second coupling hole (313), so that the second auxiliary cable wheel (33) and the main chord wheel (31) are coupled or decoupled, and the second locking block reset spring is used to push the second locking block into the second coupling hole (313).

6. The compound bow according to claim 5, characterized in that: The first track-changing block (64) is provided with a first inclined surface (641), and the first guide module (63) is driven to move via the first inclined surface (641); the second track-changing block is provided with a second inclined surface, and the second guide module is driven to move via the second inclined surface.

7. The compound bow according to claim 1, characterized in that: The composite bow further comprises a cable distribution device (11), the cable distribution device (11) being arranged on the bow handle (1), comprising a mounting seat (111), a first cable distribution pulley (112), a second cable distribution pulley (113) and a third cable distribution pulley (114), wherein the first cable distribution pulley (112), the second cable distribution pulley (113) and the third cable distribution pulley (114) are all arranged on the mounting seat (111) and distributed in a triangular shape; the main string (4) is hooked on a main string hanging head (314) of the main string wheel (31) One end of the first auxiliary cable (7) is hooked on the auxiliary cable hanging head (322) of the first auxiliary cable wheel (32), and the other end is hooked on the first auxiliary cable hanging ring (9), and the middle part of the first auxiliary cable (7) is also hooked on the first cable distribution pulley (112); one end of the second auxiliary cable (8) is hooked on the auxiliary cable hanging head (322) of the second auxiliary cable wheel (33), and the other end is hooked on the second auxiliary cable hanging ring (10), and the middle part of the second auxiliary cable (8) is also hooked on the second cable distribution pulley (113) and the third cable distribution pulley (114).

8. The compound bow according to claim 1, characterized in that: The main chord (4) is hooked on the main chord hanging head (314) of the main chord wheel (31); one end of the first auxiliary cable (7) is hooked on the auxiliary cable hanging head (322) of the first auxiliary cable wheel (32), and the other end is hooked on the first auxiliary cable hanging ring (9); one end of the second auxiliary cable (8) is hooked on the auxiliary cable hanging head (322) of the second auxiliary cable wheel (33), and the other end is hooked on the second auxiliary cable hanging ring (10).

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