bow

Abstract

We offer a bow with easily replaceable cables. [Solution] The bow is designed to launch an arrow by using the elastic force of the cable 30 to rotate the string cams 51L and 51U in the opposite direction to the draw when the string 20 is released after the draw. The bow has a holder portion that holds the pin 31U or 31L adjacent to the outer surface when the pin 31U or 31L is attached. At least one of the small diameter cam 53L and large diameter cam 52U is located outside the outer surface of at least one of the cams, and the end of the cable 30 wrapped around at least one of the cams is connected to a detachable pin 31U or 31L.

Description

Technical Field

[0001] The present invention relates to bows.

Background Art

[0002] There are bows that, by drawing a cable instead of elastically deforming a limb by drawing a string, use the elastic energy of the cable to shoot an arrow.

[0003] For example, Patent Document 1 discloses a bow including a pair of string cams disposed at both ends of a bow body around which a string for knocking an arrow is wound, and a small-diameter cam and a large-diameter cam disposed at one end and the other end of the bow body, respectively, which rotate in conjunction with the corresponding string cams to elastically deform a cable.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the small-diameter cam and the large-diameter cam of the bow described in Patent Document 1, through-holes penetrating in the axial direction are formed. The small-diameter cam and the large-diameter cam are attached to the bow body by passing a rotating shaft provided in the bow body through those through-holes. On the other hand, both ends of the cable are wound around cylindrical bobbins, respectively, and the bobbins are fitted into the through-holes of the small-diameter cam and the large-diameter cam, and the rotating shaft is passed through the bobbins, whereby the cable is attached to the small-diameter cam and the large-diameter cam, respectively.

[0006] However, with the above structure, when replacing the cable, it is necessary to remove the pivot shaft from the bow body and then remove the pivot shaft from the bobbin. After replacing the bobbin located inside the through-hole of the small diameter cam and the large diameter cam, it is necessary to pass the pivot shaft through the new bobbin and attach the pivot shaft to the bow body. Thus, with the bow described in Patent Document 1, cable replacement is not easy.

[0007] This invention was made to solve the above problems and aims to provide a bow with easily replaceable cables. [Means for solving the problem]

[0008] The bow according to the present invention is A first string cam around which one end of the string used to knock the arrow is wrapped and which rotates when the string is drawn, A second string cam, which rotates when the other end of the string is wrapped around it and the string is drawn, A small diameter cam around which one end of an elastically deformable cable is wound and which rotates in conjunction with the first string cam to unwind the wound cable, A large-diameter cam rotates in conjunction with the second string cam to wind up the other end of the cable, thereby generating elastic force in the cable. A bow comprising, which, when the string is released after drawing, rotates the first string cam and the second string cam in the opposite direction to the direction of drawing due to the elastic force of the cable, thereby launching the arrow, At least one of the small-diameter cam and the large-diameter cam is provided outside the outer circumferential surface of the at least one cam, and a pin to which the end of the cable that is wrapped around the at least one cam is connected is detachably attached, and when the pin is attached, it has a holder portion that holds the pin adjacent to the outer circumferential surface. It is characterized by the following:

[0009] The holder portion is A protruding portion that extends outward from the outer circumferential surface of at least one of the cams, A recess is provided in the protruding portion, into which the pin can be fitted with the axis of the pin oriented toward the axis direction of at least one cam, It has, The recessed portion is recessed inward from the outer circumferential surface of the protruding portion, and its shape is such that it narrows towards the inside, changing from a state larger than the diameter of the pin to a state smaller than the diameter of the pin, and the pin may be held in place when the pin is pushed in.

[0010] At least one of the first string cam and the second string cam is A cam portion having the shape of a plate, The cam portion has a groove that opens radially and outward, around which the string can be wound, and the peripheral wall portion extends along the outer circumference of the cam portion, A columnar portion that protrudes from the outer circumference of the cam portion toward the outside of the cam portion, It has, The column portion may have a mounting portion to which the end of the string, which is on the side around which it is wrapped, can be attached.

[0011] The cable extends straight from the large diameter cam toward the side where the small diameter cam is located. The aforementioned large-diameter cam has a stopper that protrudes from its outer circumferential surface. The stopper may, when the string is drawn by a certain amount, cause the large-diameter cam to rotate by a certain angle in conjunction with the first string cam, to come into contact with the cable extending straight from the large-diameter cam, thereby restricting the rotation of the large-diameter cam.

[0012] The aforementioned bow, A pulley is positioned between the large diameter cam and the small diameter cam and is capable of contacting the cable, By adjusting the position of the pulley, an adjusting mechanism is provided for adjusting whether the pulley abuts against the cable and for adjusting the amount by which the pulley is pushed into the cable when the pulley abuts against the cable. It may further include.

[0013] The bow A bow body in which the first string cam and the small-diameter cam are provided at one end, and the second string cam and the large-diameter cam are provided at the other end. A grip provided on one end side or the other end side of the bow body relative to the knocking point of the arrow of the string, for the archer to hold. A stabilizer connected to the archer's arm and having a connector for keeping the distance from the arm within a certain distance. Further comprising The grip has an axis extending in a direction from the one end to the other end of the bow body. The stabilizer may be rotatable around the axis.

Advantages of the Invention

[0014] According to the configuration of the present invention, at least one of the small-diameter cam and the large-diameter cam is provided outside the outer peripheral surface of at least one of the cams, and a pin to which the end of the first cable wound around at least one of the cams is connected is detachable, and when the pin is attached, it has a holder portion for holding the pin in a state adjacent to the outer peripheral surface. Therefore, the cable can be exchanged by removing the pin from the holder portion provided outside the outer peripheral surface of at least one of the cams or attaching the pin to the holder portion. Thus, in the present invention, the cable can be easily exchanged.

Brief Description of the Drawings

[0015] [Figure 1] It is a side view of a bow according to Embodiment 1 of the present invention. [Figure 2](A) Perspective view of the bow according to Embodiment 1 as viewed from diagonally forward to the right. (B) Perspective view of the bow as viewed from diagonally backward to the left. [Figure 3] Side view showing the state when the string and cable are installed on the reel included in the bow according to Embodiment 1. [Figure 4] Front view of the reel included in the bow according to Embodiment 1. [Figure 5] Front view of the reel included in the bow according to Embodiment 1. [Figure 6] (A) Perspective view of the reel included in the bow according to Embodiment 1 as viewed from diagonally above to the right. (B) Perspective view of the reel as viewed from diagonally below to the right. (C) Perspective view of the reel as viewed from diagonally above to the left. [Figure 7] (A) Side view of the large-diameter cam included in the reel of the bow according to Embodiment 1. (B) Side view showing the state of the small-diameter cam included in the same reel when no pin is attached. (C) Side view showing the state of the small-diameter cam included in the same reel when a pin is attached. (D) Front view of the pin of the string cam and the string end included in the same reel. (E) Side view of the string cam included in the same reel. (F) Side view showing a modified example of the large-diameter cam included in the same reel. [Figure 8] Enlarged view of region VII shown in FIG. 1. [Figure 9] (A) Side view of the large-diameter cam included in the reel of the bow according to Embodiment 1. (B) Side view showing the state where the stopper of the large-diameter cam abuts on the cable. [Figure 10] (A) Cross-sectional view of the string cam of the reel included in the bow according to Embodiment 2. (B) Cross-sectional view showing a modified example of the string cam.

Embodiments for Carrying out the Invention

[0016] Hereinafter, a bow according to an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals. In the Cartesian coordinate system XYZ shown in the drawings, if the arc-shaped bow body is pointed vertically and an arrow is fired forward, the vertical direction is the Z axis, the front-to-back direction is the X axis, and the direction perpendicular to the Z axis and X axis is the Y axis. Hereafter, this coordinate system will be referenced as appropriate in the explanation.

[0017] (Embodiment 1) The bow according to Embodiment 1 does not have limbs; instead, it uses a cable that is elastically deformed to launch the arrow. To facilitate cable replacement, this bow is provided with a holder portion on the outer surface of a small-diameter cam, to which a pin connected to one end of the cable can be attached and detached. This bow also has a configuration that facilitates the replacement of the string used to knock the arrow. The following describes the configurations that facilitate the replacement of the cable and string, including these configurations, and related configurations. First, the overall configuration of the bow will be described with reference to Figures 1-4.

[0018] Figure 1 is a side view of the bow 1 according to Embodiment 1 of the present invention. Figure 2(A) is a perspective view of the bow 1 from the front right. Figure 2(B) is a perspective view of the bow 1 from the rear left.

[0019] As shown in Figures 1 and 2, the bow 1 comprises a bow body 10 and reels 50U and 50L provided at the upper and lower ends of the bow body 10, respectively, from which the string 20 and cables 30 and 40 are attached.

[0020] The bow body 10 is formed in a V-shape, with the rod bent in a curved manner, in order to accommodate the string 20 that nocks the arrow. To achieve this shape, the bow body 10 has a fan-shaped connecting section 11 when viewed from the side, and arm sections 12U and 12L connected by the connecting section 11.

[0021] The connecting section 11 is formed by a roughly fan-shaped frame. As shown in Figure 2, the connecting section 11 consists of two roughly fan-shaped frames, with the protruding ends of their arcs facing forward, i.e., in the +X direction, and separated by a certain distance in the left-right direction, i.e., in the Y direction. These frames are connected by a rod or the like. To make it easier for the archer 100 to handle the bow body 10, a support member 13, which is elongated in a roughly rectangular shape when viewed from the side, is attached to the connecting section 11 as shown in Figure 1, with its longitudinal direction facing the front-back direction. Furthermore, various parts such as a grip 14, a stabilizer 15, and a rest (not shown) are attached to the support member 13. As a result, the connecting section 11 allows the archer 100 to hold the bow body 10 and makes it easier for the archer 100 to shoot arrows. On the other hand, arm portions 12U and 12L are attached to both ends of the arc of the roughly sector-shaped connecting portion 11, that is, the upper and lower ends of the connecting portion 11.

[0022] As shown in Figure 2, each arm section 12U and 12L has the shape of a long, slender rectangular prism frame formed by the combination of rod-shaped members. The arms 12U and 12L are attached to the upper and lower ends of the roughly fan-shaped connecting section 11 described above. As a result, as shown in Figures 1 and 2, the extensions of the arms 12U and 12L intersect at an obtuse angle. Consequently, the arms 12U and 12L cause the bow body 10 to bend into a V-shape. In other words, it becomes a bow shape. To attach the string 20 to this bow-shaped string section, reels 50U and 50L are provided at the upper end of the arm section 12U and the lower end of the arm section 12L, respectively. Detailed diagrams of these reels 50U and 50L are shown in Figures 3 and 4.

[0023] Figure 3 is a side view showing the reels 50U and 50L of the bow 1 with the string 20 and cables 30 and 40 installed. Figure 4 is a front view of the reels 50U and 50L. Note that in Figure 3, the components of the bow body 10 and other parts are omitted for ease of understanding. Also, in Figure 4, cables 30 and 40 are shown to illustrate the wiring. Furthermore, most of the bow body 10 is omitted.

[0024] As shown in Figures 3 and 4, the reel 50U is equipped with a string cam 51U (also called the first string cam or second string cam), a large diameter cam 52U, and a small diameter cam 53U for winding and installing the strings 20, cables 30, and 40, respectively.

[0025] The string cam 51U, the large diameter cam 52U, and the small diameter cam 53U are formed in the shape of non-circular plates, although their detailed shapes will be described later. Specifically, the string cam 51U, the large diameter cam 52U, and the small diameter cam 53U are formed in the shape of plates in which curved surfaces with different curvatures in the circumferential direction are connected. Grooves are formed on the outer circumferential surface of each of these non-circular plates, and the upper ends of the strings 20 and cables 30 and 40 are wrapped around each of these grooves.

[0026] Furthermore, as shown in Figure 3, the string cam 51U, the large diameter cam 52U, and the small diameter cam 53U have increasing outer diameters in that order, and as shown in Figure 4, they are arranged from the right, i.e., from the +Y side, in the order of large diameter cam 52U, string cam 51U, and small diameter cam 53U. The string cam 51U, the large diameter cam 52U, and the small diameter cam 53U have through holes that pass through their central axes, and the pivot shaft 54U is passed through these through holes, so that they are assembled coaxially. As a result, when the string 20 wrapped around the string cam 51U is drawn and the string cam 51U rotates in the direction RU shown in Figure 3, the large diameter cam 52U and the small diameter cam 53U rotate in the same direction in conjunction with the string cam 51U. This direction RU is opposite to the direction in which the cable 30 is wrapped around the large diameter cam 52U, and is the same direction as the direction in which the cable 40 is wrapped around the small diameter cam 53U. As a result of rotation in direction RU, the large-diameter cam 52U winds up the cable 30, and the small-diameter cam 53U unwinds the cable 40.

[0027] In contrast, the reel 50L is formed to be vertically and horizontally symmetrical with respect to the reel 50U. Specifically, as shown in Figures 3 and 4, the reel 50L includes a string cam 51L (also called the second string cam or first string cam), a large diameter cam 52L, and a small diameter cam 53L, all of which have the same shape as the string cam 51U, large diameter cam 52U, and small diameter cam 53U. These cams are arranged in the order of small diameter cam 53L, string cam 51L, and large diameter cam 52L from the +Y side, as shown in Figure 4. Furthermore, these string cams 51L, large diameter cam 52L, and small diameter cam 53L are assembled coaxially by passing a pivot shaft 54L through through holes that penetrate their respective central axes, similar to the case of the reel 50U. In addition, the lower end portion of the cable 30 is wound around the small diameter cam 53L, and the string 20 is wound around the string cam 51L. Furthermore, the lower ends of the cables 40 are each wrapped around the large-diameter cam 52L. With this configuration, when the string 20 is drawn, the string cam 51L, the small-diameter cam 53L, and the large-diameter cam 52L rotate in conjunction in the direction RL shown in Figure 3. This direction RL is the same direction as the winding direction of the cable 30 around the small-diameter cam 53L, and the opposite direction to the winding direction of the cable 40 around the large-diameter cam 52L. As a result, the small-diameter cam 53L unwinds the cable 30, and the large-diameter cam 52L winds the cable 40.

[0028] When string 20 is drawn, the length of cable 30 released by the small-diameter cam 53L of reel 50L is less than the length of cable 30 wound up by the large-diameter cam 52U of reel 50U. Also, the length of cable 40 wound up by the large-diameter cam 52L of reel 50L is greater than the length of cable 40 released by the small-diameter cam 53U of reel 50U. As a result, cables 30 and 40 are pulled and elastically deformed. That is, elastic forces are generated in cables 30 and 40. Consequently, when string 20 is released after being drawn, these elastic forces cause reels 50U and 50L to rotate in the opposite direction to when string 20 was drawn. This causes the arrow, which has been knocked onto string 20, to be launched.

[0029] In this way, the reels 50U and 50L use the force of drawing the string 20 to elastically deform the cables 30 and 40, converting the force of drawing the string 20 into the force of launching the arrow.

[0030] To tension these elastically deformable cables 30 and 40, conventionally, although not shown in the diagram, reels 50U and 50L had loops at each end of the cables 30 and 40, and the pivot shafts 54U and 54L of reels 50U and 50L were passed through the bobbins that passed through these loops. Furthermore, with the pivot shafts 54U and 54L still in place, each bobbin was housed in the cylindrical internal space formed in the large-diameter cams 52U and 52L and the small-diameter cams 53U and 53L, respectively. In addition, the cables 30 and 40 extending from each bobbin were pulled out through openings leading to the internal spaces of the large-diameter cams 52U and 52L and the small-diameter cams 53U and 53L, respectively, and the pulled-out cables 30 and 40 were wound around grooves on the outer circumference of the large-diameter cams 52U and 52L and the small-diameter cams 53U and 53L.

[0031] However, with such a configuration, when replacing cables 30 and 40, it becomes necessary to pass the pivot shafts 54U and 54L through each bobbin, and to house each of these bobbins in the internal spaces of the large-diameter cams 52U and 52L and the small-diameter cams 53U and 53L, respectively, making the replacement of cables 30 and 40 difficult. Furthermore, the time required to replace cables 30 and 40 becomes lengthy.

[0032] Therefore, in the bow 1 according to Embodiment 1, in order to facilitate the replacement of cables 30 and 40, pins to which the ends of cables 30 and 40 are attached are used instead of bobbins. A structure is adopted in which these pins are attached to the outer circumference of the large diameter cams 52U and 52L and the small diameter cams 53U and 53L, respectively. Furthermore, in order to facilitate the replacement of the string 20, a structure is adopted in which the end of the string 20 is hooked onto a column that protrudes from the outer circumference of the string cams 51U and 51L.

[0033] Next, referring to Figures 5-8, the mounting structure of cables 30 and 40 to the large diameter cams 52U and 52L and the small diameter cams 53U and 53L, and the mounting structure of strings 20 to string cams 51U and 51L will be described. Note that the large diameter cams 52U and 53U and the large diameter cams 52L and 53L have the same configuration except for being vertically and horizontally symmetrical. Similarly, the string cams 51U and 51L have the same configuration except for being vertically and horizontally symmetrical. Therefore, in the following description, only the configuration of the large diameter cams 52U and 53U and the string cam 51U will be described, and the configuration of the large diameter cams 52L and 53L and the string cam 51L will be omitted.

[0034] (Cable mounting structure for large diameter cams) Figure 5 is a front view of the reel 50U provided on the bow 1. Figures 6(A), (B), and (C) are perspective views of the reel 50U as seen from the upper right, lower right, and upper left. Figure 7(A) is a side view of the large-diameter cam 52U on the reel 50U. Figures 6(A), (B), and (C) show the reel 50U sandwiched between bearings 55 and 56, resulting in a rotatable reel 50U. Figure 7(A) also shows the large-diameter cam 52U assuming that each cam of the integrally molded reel 50U has been separated. The same principle of showing each cam as if it had been separated is also applied to Figures 7(B)-(F) described later.

[0035] As shown in Figures 5, 6(A), and 6(B), the large-diameter cam 52U has a cam portion 521 and protrusions 522 and 523 that protrude from the cam portion 521 on both sides in the axial direction D1.

[0036] As shown in Figure 7(A), the large-diameter cam 52U has a through hole 526 for passing the pivot shaft 54U through. The pivot shaft 54U shown in Figure 5 passes through the through hole 526, and the cam rotates as the pivot shaft 54U rotates. The cam portion 521 has a non-circular shape in side view, and the cable 30 is wrapped around it, causing the large-diameter cam 52U to rotate and elastically deform the cable 30. In detail, as shown in Figure 4, the cable 30 is wrapped around pins 31U and 31L multiple times, causing it to be folded back multiple times between pins 31U and 31L. As a result, it moves up and down between pins 31U and 31L multiple times. To wrap around such a cable 30, the cam portion 521 has a certain width in the axial direction D1 of the large-diameter cam 52U, for example, a width several times the diameter of the cable 30, as shown in Figure 5. Furthermore, protrusions 522 and 523 are provided on both sides of the cam portion 521 in the axial direction D1, so that the cable 30 can be wrapped around the cam portion 521 with the pin 31U adjacent to it.

[0037] The protrusions 522 and 523 protrude perpendicular to the axial direction D1 of the large-diameter cam 52U, that is, radially D2 of the large-diameter cam 52U and outward. The aforementioned pins 31U and 31L are formed in a cylindrical or cylindrical shape, and the cable 30 is wrapped around their cylindrical or cylindrical surface. As shown in Figure 7(A), the protrusion length L1 of the protrusions 522 and 523 is approximately the same as the diameter of the pin 31U. Also, the protrusion width W1 of the protrusions 522 and 523 is larger than the diameter of the pin 31U. Furthermore, the tips of the protrusions 522 and 523 are rounded into the shape of an arc with a diameter approximately the same as the circular cross-sectional shape of the pin 31U. With this configuration, the protrusions 522 and 523 are able to hold the pin 31U between them.

[0038] Furthermore, as shown in Figure 5, the protrusions 522 and 523 are positioned on both sides of the cam portion 521, with the cam portion 521 in between. As a result, the protrusions 522 and 523 face each other at a certain distance apart. This certain distance is slightly smaller than the length of the pin 31U. In order to allow the pin 31U to be fitted between these protrusions 522 and 523, recesses 524 and 525 are formed on the faces of the protrusions 522 and 523 that face each other, i.e., on their inner faces.

[0039] The recesses 524 and 525, although not shown in the figures, are circular in shape, having the same diameter and concentric shape as the arcs at the tips of the protrusions 522 and 523 when viewed from the side. As a result, the recesses 524 and 525 are formed on the portion of the protrusions 522 and 523 from the arc-shaped tip to the inner cam portion 521. Furthermore, the recesses 524 and 525 are formed to a depth that allows the pin 31U to be inserted between them. With this configuration, the recesses 524 and 525 allow the pin 31U to be fitted between the recesses 524 and 525. Also, when the pin 31U is fitted, it is positioned adjacent to the cam portion 521. As a result, the recesses 524 and 525 cause the protrusions 522 and 523 to function as holders for the pin 31U (note that the protrusions 522 and 523 are examples of holder portions as defined in the claims).

[0040] As described above, the protrusions 522 and 523 of the large-diameter cams 52U and 52L in the bow 1 according to Embodiment 1 are provided outside the cam portion 521, and pins 31U and 41L to which the ends of the cables 30 and 40 that are wrapped around the cam portion 521 are connected are detachable. Furthermore, when the pins 31U and 41L are attached, the protrusions 522 and 523 hold the pins 31U and 41L adjacent to the outer circumferential surface of the cam portion 521. With this configuration, the protrusions 522 and 523 enable the cables 30 and 40 attached to the pins 31U and 41L to be wrapped tightly around the cam portion 521. In addition, by positioning the pins 31U and 41L adjacent to the cam portion 521, the pins 31U and 41L are brought closer to the center of gravity of the large-diameter cams 52U and 52L, making the rotation of the large-diameter cams 52U and 52L less prone to wobbling. In other words, the moment of inertia is reduced.

[0041] (Cable attachment structure to small diameter cam) Furthermore, the small diameter cams 53L and 53U are also provided with a structure for attaching pins 31L and 41U. Figures 7(B) and 7(C) show the structure of the small diameter cam 53U. Note that, as mentioned above, the small diameter cam 53L has the same configuration as the small diameter cam 53U except that it is vertically and horizontally symmetrical, so its illustration and explanation are omitted.

[0042] Figure 7(B) is a side view of the small diameter cam 53U of the reel 50U when the pin 41U is not attached. Figure 7(C) is a side view of the small diameter cam 53U when the pin 41U is attached.

[0043] As shown in Figures 5, 6(B), 6(C), and 7(B), the small diameter cam 53U has a cam portion 531, protruding portions 532 and 533 that protrude from the cam portion 531, and recesses 534 and 535 formed in the protruding portions 532 and 533.

[0044] As shown in Figure 7(B), the small diameter cam 53U, like the large diameter cam 52U, has a through hole 536 for passing the pivot shaft 54U through. The small diameter cam 53U rotates as the pivot shaft 54U rotates after passing through the through hole 536. The cam portion 531, like the cam portion 521 described above, has a non-circular shape in side view, and the cable 40 is wrapped around it, causing the small diameter cam 53U to rotate and the cable 40 to be unwound. In detail, as shown in Figure 4, the cable 40, like the cable 30, is wrapped around pins 41U and 41L multiple times, causing it to be folded back and forth between pins 41U and 41L multiple times. As a result, it moves up and down between pins 41U and 41L multiple times. The cam portion 531 has a certain width in the axial direction D1, for example, several times the diameter of the cable 40, as shown in Figure 5, in order to wind such a cable 40 around it. Protrusions 532 and 533 are provided on both sides of the cam portion 531 in the axial direction D1 in order to wind the cable 40 around the pin 41U adjacent to the cam portion 531.

[0045] As shown in Figure 7(B), the protrusions 532 and 533 project radially D2 outward from the cam portion 531 toward the small diameter cam 53U. The amount of protrusion L2 is sufficiently larger than the diameter of the pin 41U. Furthermore, as shown in Figure 5, the protrusions 532 and 533 are positioned on both sides of the cam portion 531. Due to this configuration, the protrusions 532 and 533 face each other at a certain distance apart. This certain distance is slightly smaller than the length of the pin 41U. Recesses 534 and 535 are formed on the inner surfaces of the protrusions 532 and 533 to allow the pin 41U to be fitted between them.

[0046] As shown in Figure 7(B), recesses 534 and 535 open at the tips of protrusions 532 and 533 and extend inward from the opening towards the inside of the small-diameter cam 53U. Furthermore, they extend to a position adjacent to the cam portion 531. Their side view shape is a curve that narrows towards the inside, for example, a parabola. As a result, the width of the opening at the tip of the protrusions 532 and 533 of recesses 534 and 535 is greater than the diameter of the pin 41U, and the back of the opposite side of the opening is smaller than the diameter of the pin 41U. This allows the pin 41U to be inserted into recesses 534 and 535 from the opening side.

[0047] Furthermore, in recesses 534 and 535, the gap between the pin 41U and the inner wall of recesses 534 and 535 decreases as the pin 41U moves further into the recesses 534 and 535. As a result, when the pin 41U is inserted into recesses 534 and 535 as shown in Figure 7(C), and the cable 40 attached to the pin 41U is wrapped around the cam portion 531, the cable 40 is pulled, that is, when the cable 40 undergoes elastic deformation, the elastic force pushes the pin 41U further into the recesses 534 and 535. This firmly holds the pin 41U in place in recesses 534 and 535. Then, recesses 534 and 535 position the pin 41U adjacent to the cam portion 531 while firmly holding it. As a result, recesses 534 and 535 enable the cable 40 wrapped around the pin 41U to be tightly wrapped around the cam portion 531. Furthermore, by bringing the pin 41U closer to the center of gravity of the small-diameter cam 53U, the rotation of the small-diameter cam 53U becomes less prone to wobble. In other words, the moment of inertia is reduced.

[0048] As described above, the small-diameter cams 53L and 53U provided in the bow 1 according to Embodiment 1 have protruding portions 532 and 533 that protrude outward from the outer circumferential surface of the cam portion 531, and recesses 534 and 535 provided in the protruding portions 532 and 533, into which the pins 31L and 41U can be fitted with their axes oriented in the axial direction of the cam portion 531. The recesses 534 and 535 are recessed inward from the outer circumferential surface of the protruding portions 532 and 533, and have a shape that narrows towards the inside, changing from a state larger than the diameter of the pins 31L and 41U to a state smaller than the diameter of the pins 31L and 41U, and the pins 31L and 41U are held in place when pushed in. For this reason, the small-diameter cams 53L and 53U can firmly hold the pins 31L and 41U with the elastic force of the cables 30 and 40. Furthermore, as a result of the cables 30 and 40 being pulled, the pins 31L and 41U can maintain a state in which they are held in the recesses 524 and 525 of the protrusions 522 and 523 of the large-diameter cams 52U and 52L mentioned above.

[0049] (Structure for attaching the string to the string cam) Furthermore, to facilitate the replacement of the string 20, the string cams 51U and 51L are provided with a structure on the column portion for hooking the end of the string 20. The structure of the string cam 51U is shown in Figures 7(D) and 7(E). As mentioned above, the string cam 51L has the same configuration as the string cam 51U except that it is vertically and horizontally symmetrical, so its illustration and description are omitted.

[0050] Figure 7(D) is a front view of the column portion 512 of the string cam 51U and the end of the string 20 on the reel 50U. Figure 7(E) is a side view of the string cam 51U on the reel 50U.

[0051] As shown in Figure 7(E), the string cam 51U has a flat cam portion 511, a column portion 512 protruding from the outer circumferential surface of the cam portion 511, and a peripheral wall portion 513 extending along the outer circumference of the cam portion 511.

[0052] The cam portion 511 has a shape that includes numerous radially extending ribs and numerous cavities between these ribs, in order to reduce weight. The cam portion 511 is flat overall. Furthermore, the cam portion 511 is non-circular in order to adjust the force applied when the shooter 100 draws the string 20 according to the length of the draw. Specifically, it has a shape that includes an elliptical-like arc portion and a straight string portion. In order to allow rotation, the string portion of the cam portion 511 is provided with a shaft portion that has a through hole 516 through which a pivot shaft 54U passes. Furthermore, a column portion 512 for attaching the end of the string 20 is provided adjacent to the shaft portion.

[0053] The column portion 512 protrudes radially and outward from the chord portion of the cam portion 511 described above. In detail, the column portion 512 has the shape of a thin cylinder, i.e., a disc, and its column axis is oriented perpendicular to the end face of the chord portion of the cam portion 511. The column portion 512 is provided with a string attachment portion P1 that is tapered in the center along the column axis to facilitate the wrapping of the string 20. As shown in Figures 7(D) and 7(E), the string 20 is held by the loop provided at the end of the string 20 passing through this attachment portion P1. In this case, the loop at the end of the string 20 is wrapped around the column portion 512, but the end of the string 20 may also be tied to the column portion 512. The string 20 is stretched along the string portion of the cam portion 511 after its loop is placed over the column portion 512, and then placed over the corner portion between the string portion and the arc portion of the cam portion 511, and then wrapped around the peripheral wall portion 513 in that arc portion.

[0054] The peripheral wall portion 513 is provided on the outer circumferential surface portion of the elliptical-like arc portion of the cam portion 511 described above. As shown in Figure 5, the cross-sectional shape of the peripheral wall portion 513 is such that the plate is bent into a U shape, with the valley of the U-shape facing inward towards the cam portion 511. As a result, the valley of the U-shape opens radially and outward from the cam portion 511, forming a groove that allows the string 20 to be attached from the outer circumferential side of the cam portion 511. The peripheral wall portion 513, with this configuration, makes it easy to attach the string 20.

[0055] The column axis of the column portion 512 described above is positioned at the center in the thickness direction of the end face of the chord portion of the cam portion 511 in the front view shown in Figure 5. Similarly, the bottom of the U-shape of the peripheral wall portion 513 is positioned at the center in the thickness direction of the outer surface of the arc portion of the cam portion 511. As a result, the string 20 is stretched from the column portion 512 to the peripheral wall portion 513, along the center in the thickness direction of the cam portion 511. This makes the cam portion 511 less susceptible to deformation by the force of the string 20 when the string 20 is drawn, and as a result, the force of the string 20 is converted into rotational motion in the cam portion 511 with high efficiency. In other words, the transmission efficiency of the cam portion 511 is high.

[0056] Furthermore, the peripheral wall portion 513 extends along the elliptical-like arc portion of the cam portion 511. As a result, a U-shaped valley portion of the peripheral wall portion 513 is formed throughout its entire arc portion. Consequently, the string 20 can be easily wrapped around the entire peripheral wall portion 513.

[0057] As described above, the string cam 51U has a column portion 512 that protrudes from the outer circumferential surface of the cam portion 511. Therefore, the string 20 can be easily attached to the string cam 51U simply by hooking the loop at the end of the string 20 onto the column portion 512. Furthermore, since the bottom of the grooves of both the column portion 512 and the peripheral wall portion 513 are located in the center in the thickness direction of the cam portion 511, the cam portion 511 is less likely to distort when the string 20 is attached to the column portion 512 and then the string 20 is wrapped around the peripheral wall portion 513. As a result, the string cam 51U has high transmission efficiency when the string 20 is drawn and rotated by the string 20. In addition, the string cam 51U has a column portion 512 adjacent to the shaft portion, and as a result, the heavy object is located near the pivot axis 54U, so the moment of inertia is small.

[0058] (Integration of string cam, large diameter cam and small diameter cam) As shown in Figures 5 and 6, the string cam 51U, the large diameter cam 52U, and the small diameter cam 53U are integrally molded. If the string cam 51U, the large diameter cam 52U, and the small diameter cam 53U were formed separately, each would need to have sufficient strength, which would likely result in a larger outer diameter. To prevent this, in this embodiment, these cams are integrally formed. As a result, the outer diameters of these cams are small and they are compact. By integrating these cams, the outer diameter of the small diameter cam 53U can be reduced in particular, bringing its center of gravity closer to the pivot axis 54U. As a result, the rotation of the small diameter cam 53U is less prone to wobble; that is, its moment of inertia is small.

[0059] The string cam 51U, the large diameter cam 52U, and the small diameter cam 53U may be formed as separate components. Figure 7(F) is a side view showing a modified example of the large diameter cam 52U. When the string cam 51U, the large diameter cam 52U, and the small diameter cam 53U are formed as separate components, as shown in Figure 7(F), the large diameter cam 52U may slip relative to the pivot shaft 54U, and to prevent a phase shift with respect to the other cams, it is preferable that the large diameter cam 52U is arranged in the circumferential direction within the through hole 536 and has multiple protrusions that fit into the multiple protrusions on the pivot shaft 54U. In this case, multiple protrusions arranged in the circumferential direction are formed on the outer circumference of the pivot shaft 54U, and the protrusions on the inner wall of the through hole 536 fit into the protrusions on the outer circumference of the pivot shaft 54U. Furthermore, it is preferable that, similar to the large diameter cam 52U, multiple protrusions are arranged in the circumferential direction on the inner walls of the through holes 516 and 536 of the string cam 51U and the small diameter cam 53U to prevent slippage, so as to engage with the protrusions on the outer circumference of the pivot shaft 54U.

[0060] (Cable adjustment structure) As described above, the large-diameter cam 52U and the small-diameter cam 53U each employ a structure that allows for the attachment and detachment of pins 31U and 41U, to which the loops of cables 30 and 40 are attached, in order to facilitate the routing of the cables 30 and 40. Although not explained in detail, the large-diameter cam 52L and the small-diameter cam 53L each employ a similar structure.

[0061] However, it is not easy to tension the cable 30 between the large diameter cam 52U and the small diameter cam 53L without any slack. Similarly, it is not easy to tension the cable 40 between the small diameter cam 53U and the large diameter cam 52L without any slack.

[0062] Therefore, in bow 1, a cable adjustment mechanism is provided on the bow body 10 to keep the cables 30 and 40 taut. Next, with reference to Figure 8, the cable adjustment mechanism will be explained.

[0063] Figure 8 is an enlarged view of area VII shown in Figure 1. As shown in Figure 8, the cable adjustment mechanism 60 includes a pulley 61 around which the cables 30 and 40 are routed, and an adjustment mechanism 62 for adjusting the position of the pulley in the front-rear direction.

[0064] The pulley 61 is provided on the connecting portion 11 of the bow body 10. More specifically, the pulley 61 is provided near the front end of the fan-shaped connecting portion 11, with the arc-shaped portion facing forward in a side view. As a result, the pulley 61 is positioned between the large diameter cam 52U and the small diameter cam 53L, and between the small diameter cam 53U and the large diameter cam 52L. Cables 30 stretched between the large diameter cam 52U and the small diameter cam 53L, and cable 40 stretched between the small diameter cam 53U and the large diameter cam 52L are stretched over the front portion of the pulley 61. As a result of being provided in the above position, the pulley 61 is located in the bent portion of the bow body 10 in a side view. Consequently, the pulley 61 stretches cables 30 and 40 in a bent shape in a side view.

[0065] On the other hand, the adjustment mechanism 62 includes a frame 621 that rotatably holds the pulley 61, and a threaded portion 622 that allows the frame 621 to be moved in the front-rear direction.

[0066] The frame 621 is formed in a rectangular shape when viewed from the side. The frame 621 holds the rotation axis of the pulley 61 in the left-right direction, i.e., the Y direction. The frame 621 is provided with a screw hole (not shown) that extends in the front-rear direction, and the threaded portion 622 passes through this screw hole.

[0067] The threaded portion 622 is rotatably held by the connecting portion 11 of the bow body 10, and its rotation moves the frame 621 in the front-rear direction. As described above, cables 30 and 40 are wrapped around the pulley 61 from the front. By rotating the threaded portion 622, the amount the pulley 61 is pushed into the cables 30 and 40 is adjusted. In other words, the threaded portion 622 adjusts the tension of the cables 30 and 40.

[0068] In detail, when cables 30 and 40 are removed for replacement, the threaded portion 622 is rotated by the shooter 100, causing the frame 621 to move backward. This moves the pulley 61 backward. As a result, the threaded portion 622 reduces the amount the pulley 61 is pushed into the cables 30 and 40, or prevents the pulley 61 from contacting the cables 30 and 40. Consequently, the threaded portion 622 loosens the cables 30 and 40, making them replaceable.

[0069] On the other hand, when replacing cables 30 and 40 and attaching them, the screw portion 622 is rotated by the archer 100, moving the frame 621 forward. This moves the pulley 61 forward. As a result, the screw portion 622 brings the cables 30 and 40 into contact with the pulley 61. Alternatively, it increases the amount that the pulley 61 pushes into the cables 30 and 40 when they are in contact. Consequently, the screw portion 622 keeps the cables 30 and 40 taut and ready for use.

[0070] As described above, in the cable adjustment mechanism 60, the pulley 61 is positioned between the large diameter cam 52U and the small diameter cam 53L, and between the small diameter cam 53U and the large diameter cam 52L, and is capable of contacting the cables 30 and 40. The screw portion 622 rotates to adjust the position of the pulley 61, thereby adjusting whether or not the pulley 61 contacts the cables 30 and 40. Alternatively, it adjusts the amount the pulley 61 is pushed into the cables 30 and 40 when contact is made. Therefore, when replacing the cables 30 and 40, the shooter 100 can adjust the tension of the cables 30 and 40 by adjusting the position of the pulley 61 using the screw portion 622. As a result, it is easy to tighten or loosen the cables 30 and 40, and easy to replace the cables 30 and 40.

[0071] (Stabilizer) In bow 1, when drawing the string 20 to release the arrow, the arrow is nocked at the vertical center of the bow body 10, and the archer 100 grips the grip 14, which is located slightly below the vertical center. That is, the position of the nocking point P where the arrow is nocked, as shown in Figure 1, and the position of the grip 14 held by the archer 100 are offset in the vertical direction. As a result, when the string 20 pushes the arrow out and releases it, a moment M acts in both the vertical and front-to-back directions, as shown in Figure 1. Consequently, in conventional bows, the arrow sometimes did not fly straight forward and missed the target slightly. Therefore, the arrow is equipped with a stabilizer 15 that suppresses the moment M acting on the bow body 10 and stabilizes the bow body 10. Next, the configuration of the stabilizer 15 will be explained with reference to Figure 8.

[0072] As shown in Figure 8, the grip 14 is a stick-shaped object that extends vertically and is curved front to back. A stabilizer 15 is connected to the lower end of the grip 14 to suppress the moment M applied to the bow body 10.

[0073] The stabilizer 15 is formed in the shape of a long, slender rod. The stabilizer 15 is positioned with its longitudinal direction facing forward and backward. As a result, the stabilizer 15 extends from the lower end of the grip 14 towards the rear, i.e., towards the shooter 100. A connector 16 for attaching the stabilizer 15 to the shooter 100's arm is provided at the shooter 100's end. The connector 16 has a belt attachment portion 161 attached to the side of the rod of the stabilizer 15, and a belt 162 extending from the belt attachment portion and attached to the shooter 100's arm. Since the stabilizer 15 is located at the lower end of the grip 14, when the shooter 100 grips the grip 14 with their hand, the stabilizer 15 is positioned below the shooter 100's arm. Since the belt 162 of the connector 16 is attached to the shooter 100's arm, the stabilizer 15 cannot move below the length of the belt 162 from the shooter 100's arm. In other words, the stabilizer 15 maintains a certain distance from the archer's arm 100. This allows the stabilizer 15 to suppress the aforementioned moment M when the archer 100 releases the nocked arrow and the string 20 pushes the arrow out. As a result, the arrow is less likely to miss the target, increasing the accuracy of the arrow's hit.

[0074] On the other hand, when the archer 100 nocks an arrow, the bow body 10 is positioned to the right or left of the archer 100's body, resulting in the archer 100's arm tilting to the left or right, i.e., in the Y direction in Figure 8. As a result, the longitudinal direction of the stabilizer 15 also tilts in the Y direction, and the arrow may also tilt in the same direction. In that case, the accuracy of the arrow hitting the target decreases. To prevent such tilting, the stabilizer 15 is rotatably connected to the grip 14, which has a vertically extending axis, i.e., extending in the Z direction. In detail, the lower end of the grip 14 is provided with an axis 151 extending in the Z direction, and this axis 151 is loosely inserted into a hole that passes through the stabilizer 15. This allows the stabilizer 15 to rotate around its axis 151. As a result, it is possible to tilt it in the Y direction relative to the grip 14. This allows the stabilizer 15 to change its inclination relative to the grip 14 according to the orientation of the shooter's arm 100. As a result, the stabilizer 15 can prevent the arrow from tilting and reducing its accuracy on the target.

[0075] As described above, the bow 1 is equipped with a stabilizer 15 that has a connecting device 16 that is attached to the arm of the archer 100 and maintains a certain distance from the arm. Therefore, when the archer 100 releases the arrow and the string 20 pushes the arrow out, the bow body 10 is less likely to experience vertical and longitudinal moments M. As a result, the bow 1 has a high hit rate with arrows.

[0076] Furthermore, the grip 14 has an axis 151 that extends in the direction from the reel 50U to the reel 50L or in the opposite direction, i.e., in the vertical direction. In addition, the stabilizer 15 is rotatable around its axis 151. Therefore, even if the archer's arm 100 is tilted to the left or right relative to the grip 14, the orientation of the stabilizer 15 relative to the grip 14 can be changed. As a result, the bow 1 has a higher hit rate for arrows on the target.

[0077] (Stopper for large diameter cam) In bow 1, the reels 50U and 50L rotate by an angle corresponding to the distance the string 20 is drawn, and the cables 30 and 40 elastically deform by a corresponding length. Bow 1 then propels the arrow with the resulting elastic force. Therefore, if the distance the string 20 is drawn is constant, it is possible to propel the arrow the same distance with the same elastic force. Against this backdrop, bow 1 is equipped with a structure that allows the archer 100 to define the draw distance and propel the arrow the same distance. In detail, triangular stoppers are provided on the outer circumference of the large-diameter cams 52U and 52L, which determine the maximum rotation angle that the reels 50U and 50L can rotate due to the draw. The stopper of the large-diameter cam 52U will be described below with reference to Figures 9(A) and (B). As mentioned above, the large-diameter cams 52U and 52L have the same configuration except that they are vertically and horizontally symmetrical. Therefore, in the following explanation, only the configuration of the large-diameter cam 52U will be described, and the explanation of the configuration of the large-diameter cam 52L will be omitted.

[0078] Figure 9(A) is a side view of the large-diameter cam 52U on the reel 50U of the bow 1. Figure 9(B) is a side view showing the state in which the stopper 527 of the large-diameter cam 52U on the reel 50U is in contact with the cable 30.

[0079] As shown in Figure 9(A), the large-diameter cam 52U has a stopper 527 that protrudes from its outer circumferential surface. The stopper 527 protrudes from the large-diameter cam 52U in a triangular shape when viewed from the side, and this triangular shape has a side that is located on the opposite side of the direction RU in which the string cam 51U rotates when the string 20 is drawn by the shooter 100. This side extends linearly and also forms a tangent to the outer circumference of the large-diameter cam 52U. As a result, the stopper 527 has a plane 528 that extends in the left-right direction, i.e., the Y direction, along its triangular side. Note that this plane 528 extends from the cam portion 521 shown in Figure 5, not from the protruding portions 522 and 523.

[0080] Meanwhile, the cable 30 extends straight from the large-diameter cam 52U toward the side where the small-diameter cam 53L is located, around which the other end of the cable 30 is wound. More specifically, the cable 30 extends straight from the large-diameter cam 52U toward the pulley 61 shown in Figure 3. The plane 528 of the stopper 527 comes into contact with the straight-extending cable 30, as shown in Figure 9(B), when the large-diameter cam 52U rotates by a certain angle in conjunction with the string cam 51U due to the string 20 being drawn by a certain amount. As a result, the stopper 527 restricts the rotation of the large-diameter cam 52U. When the stopper 527 restricts the rotation of the large-diameter cam 52U, the string cam 51U cannot rotate any further in direction RU. As a result, the stopper 527 informs the shooter 100 that the string 20 has been drawn by a specified amount. The archer 100 can draw the string 20 by a certain amount until the rotation of the string cam 51U is restricted, and can fire the arrow with a consistent energy each time.

[0081] As described above, the bow 1 has a stopper 527 on which the large diameter cams 52U and 52L protrude from the cam portion 521. The stopper 527 restricts the rotation of the large diameter cams 52U and 52L by contacting the cables 30 and 40 that extend straight from the large diameter cams 52U and 52L toward the side where the small diameter cams 53U and 53L are located when the string 20 is drawn by a certain amount, causing the large diameter cam 52U to rotate by a certain angle in conjunction with the string cam 51U. In this way, the stopper 527 restricts the rotation of the string cams 51U and 51L that are in conjunction with the large diameter cams 52U and 52L. With the stopper 527 provided on the bow 1, the archer 100 can easily determine whether the string 20 has been drawn to the specified amount during the draw.

[0082] (Embodiment 2) In Embodiment 1, a column portion 512 for attaching the end of the string 20 is provided on the end face of the flat cam portion 511 of the string cam 51U. However, the present invention is not limited to this. The string cams 51U and 51L only need to rotate when one end of the string 20 for knocking the arrow is wrapped around them and the string 20 is drawn, or when the other end of the string 20 is wrapped around them and the string 20 is drawn. The string cams 51U and 51L only need to satisfy this condition, and therefore, the position where the column portion 512 is provided on the string cams 51U and 51L is arbitrary.

[0083] In the string cams 51U and 51L of the bow 1 according to Embodiment 2, a column portion 512 for attaching the end of the string 20 is provided on the plate surface portion of the cam portion 511 of the string cams 51U and 51L. The string cams 51U and 51L of the bow 1 according to Embodiment 2 will be described below with reference to Figures 10(A) and (B). As described in Embodiment 1, the string cam 51U in Embodiment 2 has the same configuration except that it is vertically symmetrical and horizontally symmetrical. For this reason, only the configuration of the string cam 51U will be described in the following description, and the configuration of the string cam 51L will be omitted.

[0084] Figure 10(A) is a cross-sectional view of the string cam 51U of the reel 50U of the bow 1 according to Embodiment 2. Figure 10(B) is a cross-sectional view showing a modified example of the string cam 51U. Figures 10(A) and (B) show the cross-section of the string cam 51U of Embodiment 2 when it is cut along the IX-IX cutting line shown in Figure 7(E).

[0085] As shown in Figure 10(A), the string cam 51U has a cam portion 517 with a bent plate surface, a column portion 512 provided on the plate surface portion of the cam portion 517, and a peripheral wall portion 518 extending along the outer circumference of the cam portion 517.

[0086] The cam portion 517 has a shape in which the plate is bent in the left-right direction, i.e., the Y direction, near the through hole 516. As a result, in the cam portion 517, the portion P3 on the other side of the through hole 516 is located in the +Y direction more than the portion P2 on the other side. The portion P2 of the cam portion 517 is provided with a column portion 512 for attaching the end of the string 20.

[0087] The column portion 512 has a cylindrical shape and is provided on one plate surface of portion P2 of the cam portion 517, i.e., the plate surface on the +Y side, and extends in a direction perpendicular to the plate surface on the +Y side. Its length L3 in the axial direction of the column is longer than the length of the bend of portion P2 of the cam portion 517 in the Y direction relative to portion P3, and the column portion 512 extends to the +Y side from the Y position of portion P3 of the cam portion 517. Furthermore, a mounting portion P1 with a tapered diameter is provided on the portion of the column portion 512 located in the Z direction of portion P3 of the cam portion 517 for attaching the string 20. The end of the string 20 is attached to the mounting portion P1 by looping the end of the string 20 over the mounting portion P1, as in the first embodiment.

[0088] In contrast, the peripheral wall portion 518 has a shape in which the plate is bent in a V-shape when viewed in cross-section. As a result, it has a groove G through which the string 20 is looped. Furthermore, the peripheral wall portion 518 extends along the outer circumferential surface of the cam portion 517. Moreover, the groove G of the peripheral wall portion 518 is located in the Z direction of the outer circumferential surface portion P4, and as a result, its Y position is the same as that of the outer circumferential surface portion P4 of portion P3 of the cam portion 517. Thus, the groove G of the peripheral wall portion 518 and the mounting portion P1 of the column portion 512 are located at the same position in the Y direction. On the other hand, in the outer circumferential surface portion P5 of portion P2 of the cam portion 517, the -Y end of the peripheral wall portion 518 is located in the Z direction of the outer circumferential surface portion P5, and as a result, the groove G is located in the +Y direction by half the length L3 of the column portion 512 compared to portion P2 of the cam portion 517. Thus, the groove G of the peripheral wall portion 518 and the mounting portion P1 of the column portion 512 are located at the same position in the Y direction.

[0089] The peripheral wall portion 518, with this configuration, allows the string 20 to be wrapped around the column portion 512 without tilting in the Y direction. As a result, the string cam 51U itself is less prone to distortion. Furthermore, although the portion of the peripheral wall portion 518 provided on the outer peripheral surface portion P4 is further away from the through hole 516 through which the pivot shaft 54U is inserted than the portion provided on the outer peripheral surface portion P5, the groove G is directly supported by the outer peripheral surface portion P4, so the string cam 51U itself is less prone to distortion. As a result, the strength of the string cam 51U is high.

[0090] As described above, in the string cams 51U and 51L of the bow 1 according to Embodiment 2, the column portion 512 is provided on the plate surface of the cam portion 517 and protrudes from that plate surface. Therefore, it is easy to attach the loop at the end of the string 20. As a result, the string 20 can be easily replaced.

[0091] Furthermore, in the cam portion 517 of the string cams 51U and 51L, the plate itself bends, so that portion P3, which is opposite to portion P2 where the column portion 512 is provided, is located in the direction of the protrusion of the column portion 512. In the portion of the peripheral wall portion 518 located at the outer peripheral surface portion P4 of portion P3, the groove G on which the string 20 is hung is provided at the same position in the axial direction D1 of the mounting portion P1 of the column portion 512 and the cam portion 517. As a result, with the string cams 51U and 51L, the string 20 can be wrapped around the peripheral wall portion 518 without tilting away from the column portion 512. In addition, in portion P3 of the cam portion 517, the outer peripheral surface portion P4 directly supports the groove G of the peripheral wall portion 518, so the strength of the string cam 51U is high.

[0092] As shown in Figure 10(B), the cam portion 517 may be flat. In that case, it is preferable that a peripheral wall portion 518 and a column portion 512 be provided on one side of the plate surface of the cam portion 517. Furthermore, it is preferable that the groove G of the peripheral wall portion 518 and the mounting portion P1 of the column portion 512 be provided at the same position in the axial direction D1 of the cam portion 517.

[0093] Although embodiments 1 and 2 of the present invention have been described above, the present invention is not limited to embodiments 1 and 2. In embodiments 1 and 2, the bow body 10 is bent in a V-shape. The bow body 10 is composed of a connecting part 11 and arm parts 12U and 12L. However, the present invention is not limited to these. In the present invention, the bow body 10 may be arc-shaped or straight. The arm parts 12U and 12L may also be foldable.

[0094] Embodiments 1 and 2 describe the invention on the premise that the arrow is fired with the string 20 extending in the vertical direction, but the present invention is not limited to this. In the present invention, the orientation of the string 20 when firing the arrow is arbitrary. The bow 1 may also fire the arrow with the string 20 tilted. The vertical, horizontal, and front-back directions in Embodiments 1 and 2 are for convenience to facilitate understanding. In the present invention, the orientation of the arrow, string 20, etc., may be changed as long as the relative positional relationship of each component of the bow 1 described above is maintained. [Explanation of Symbols]

[0095] 1…Bow, 10…Bow body, 11…Connecting part, 12U,12L…Arm part, 13…Support member, 14…Grip, 15…Stabilizer, 16…Connector, 20…String, 30…Cable, 31U,31L…Pin, 40…Cable, 41U,41L…Pin, 50U,50L…Reel, 51L,51U…String cam, 52L,52U…Large diameter cam, 53L,53U…Small diameter cam, 54L,54U…Rotating shaft, 55,56…Bearing, 60…Cable adjustment mechanism, 61…Pulley, 62…Adjustment mechanism, 100…Shooter, 151…Shaft, 161…Belt attachment part ,162...belt, 511,517...cam part, 512...column part, 513,518...peripheral wall part, 516,526,536...through hole, 521...cam part, 522,523...protrusion part, 524,525...recess, 531...cam part, 532,533...protrusion part, 534,535...recess, 621...frame, 622...thread part, D1...axial direction, D2...radial direction, G...groove, L1,L2...protrusion amount, L3...length, M...moment, P...knocking point, P1...mounting part, P2,P3...part, P4,P5...outer surface part, RU,RL...direction, W1...protrusion width.

Claims

1. A first string cam around which one end of the string used to knock the arrow is wrapped and which rotates when the string is drawn, A second string cam, which rotates when the other end of the string is wrapped around it and the string is drawn, A small diameter cam around which one end of an elastically deformable cable is wound and which rotates in conjunction with the first string cam to unwind the wound cable, A large-diameter cam rotates in conjunction with the second string cam to wind up the other end of the cable, thereby generating elastic force in the cable. A bow that, when the string is released after drawing, rotates the first string cam and the second string cam in the opposite direction to the draw direction due to the elastic force of the cable, thereby launching the arrow, At least one of the small-diameter cam and the large-diameter cam is provided outside the outer circumferential surface of the at least one cam, and a pin to which the end of the cable that is wrapped around the at least one cam is connected is detachably attached, and when the pin is attached, it has a holder portion that holds the pin adjacent to the outer circumferential surface. bow.

2. The holder portion is A protruding portion that extends outward from the outer circumferential surface of at least one of the cams, A recess is provided in the protruding portion, into which the pin can be fitted with the pin's axis oriented toward the axis direction of at least one cam, It has, The recess has a shape that curves inward from the outer circumferential surface of the protrusion, becoming narrower towards the inside, and changing from a state larger than the diameter of the pin to a state smaller than the diameter of the pin, and holds the pin when the pin is pushed in. The bow according to claim 1.

3. At least one of the first string cam and the second string cam is A cam portion having the shape of a plate, The cam portion has a groove that opens radially and outward, around which the string can be wound, and the peripheral wall portion extends along the outer circumference of the cam portion, A columnar portion that protrudes from the outer circumference of the cam portion toward the outside of the cam portion, It has, The column portion has an attachment portion to which the end of the string, which is on the side around which it is wrapped, can be attached, The bow according to claim 1 or 2.

4. The cable extends straight from the large diameter cam toward the side where the small diameter cam is located. The aforementioned large-diameter cam has a stopper that protrudes from its outer circumferential surface. The stopper, when the string is drawn by a certain amount, causes the large-diameter cam to rotate by a certain angle in conjunction with the first string cam, and in doing so, contacts the cable extending straight from the large-diameter cam, thereby restricting the rotation of the large-diameter cam. The bow according to claim 1 or 2.

5. A pulley is positioned between the large diameter cam and the small diameter cam and is capable of contacting the cable, An adjustment mechanism that adjusts whether or not the pulley contacts the cable by adjusting the position of the pulley, and adjusts the amount the pulley is pushed into the cable when it contacts the cable, Furthermore, The bow according to claim 1 or 2.

6. The bow body is provided with the first string cam and the small diameter cam at one end, and the second string cam and the large diameter cam at the other end, A grip for the archer to hold is provided on one end of the bow body or on the other end of the bow body, above the nocking point of the arrow of the string, A stabilizer having a connector that is attached to the shooter's arm and maintains the distance from the arm within a certain distance, Furthermore, The grip has an axis extending in the direction from one end to the other end of the bow body, The stabilizer is rotatable around the shaft. The bow according to claim 1 or 2.

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