Patent Publication Number: US-2017370672-A1

Title: Archery Bow With Force Vectoring Anchor

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 13/230,763, filed Sep. 12, 2011, which is a continuation of U.S. application Ser. No. 12/248,467, filed Oct. 9, 2008, now U.S. Pat. No. 8,020,544, the entire content of which are hereby incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates generally to archery bows and more specifically to compound archery bows and rotatable members used in compound archery bows. 
     Compound archery bows are known in the art. Various configurations have included single cam designs, modified single cam designs and two cam designs. Each configuration can be better than other configurations in some ways, and less desirable in others. For example, it is possible for some two cam bows to launch an arrow faster than a single cam design; however, rotation of the two cams must be synchronized for optimum performance. Two cam bows have a tendency to fall out of sync, wherein the bow can experience a loss in arrow launch speed and will require maintenance to adjust cam timing. Two cam bows often generate more vibration, noise and reverberations as an arrow is launched. While a single cam bow may not shoot as fast as some two cam bows, a single cam bow will often be more pleasurable to use and will require significantly less maintenance over its life span. 
     In an attempt to solve timing issues in two cam bows, some designs use cables to directly link the cams to one another, forcing them to rotate together. Although such configurations can be more desirable than older designs, the direct mechanical linkage does have drawbacks, such as increased friction between the moving parts, causing losses in the total energy transferred to an arrow at launch. 
     There remains a need for novel archery bow designs capable of increased mechanical efficiency and subsequent arrow launch speed while also being more pleasurable for an archer to use, and requiring less maintenance. 
     All US patents and applications and all other published documents mentioned anywhere in this application are incorporated herein by reference in their entirety. 
     Without limiting the scope of the invention a brief summary of some of the claimed embodiments of the invention is set forth below. Additional details of the summarized embodiments of the invention and/or additional embodiments of the invention may be found in the Detailed Description of the Invention below. 
     A brief abstract of the technical disclosure in the specification is provided as well only for the purposes of complying with 37 C.F.R. 1.72. The abstract is not intended to be used for interpreting the scope of the claims. 
     BRIEF SUMMARY OF THE INVENTION 
     In some embodiments, an archery bow comprises a first rotatable member being rotatable about a first rotatable member axis. A first power cable anchor is attached to the first rotatable member and rotatable with respect to the first rotatable member about a first anchor axis. The first anchor axis is offset from the first rotatable member axis. A first power cable can be anchored to said first power cable anchor. 
     In some embodiments, the archery bow further comprises a second rotatable member that is rotatable about a second rotatable member axis. The first power cable can be anchored to the second rotatable member. 
     In some embodiments, the second rotatable member comprises a second power cable anchor that is rotatable with respect to the main body of the second rotatable member about a second anchor axis. The second anchor axis is offset from the second rotatable member axis. A second power cable can be anchored to said second power cable anchor. 
     In some embodiments, a rotatable member for use with a compound archery bow comprises a body configured for rotation about a rotatable member axis and a cable anchor. The cable anchor is attached to the body and rotatable with respect to said body about an anchor axis, wherein the anchor axis is offset from the rotatable member axis. 
     In some embodiments, a rotatable member for use with a compound archery bow comprises a body configured for rotation about a rotatable member axis and a module configured for attachment to the body. The module comprises a cable anchor that is rotatable with respect to the module about an anchor axis, wherein the anchor axis offset from the rotatable member axis. 
     These and other embodiments which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof However, for a better understanding of the invention, its advantages and objectives obtained by its use, reference can be made to the drawings which form a further part hereof and the accompanying descriptive matter, in which there are illustrated and described various embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A detailed description of the invention is hereafter described with specific reference being made to the drawings. 
         FIG. 1  shows an embodiment of an archery bow. 
         FIG. 2  shows a rotatable member at multiple orientations. 
         FIGS. 3-5  show an embodiment of upper and lower rotatable members at multiple rotational orientations, such as at-rest, mid-draw and full-draw. 
         FIGS. 6-9  each show an embodiment of an archery bow. 
         FIGS. 10-12  show another embodiment of upper and lower rotatable members at various rotational orientations, such as at-rest, mid-draw and full-draw. 
         FIG. 13  shows an embodiment of a rotatable member having an embodiment of a vectoring anchor. 
         FIG. 14  shows an embodiment of a rotatable member having an embodiment of a split vectoring anchor. 
         FIGS. 15-17  show another embodiment of upper and lower rotatable members at various rotational orientations, such as at-rest, mid-draw and full-draw. 
         FIG. 18  shows a portion of another embodiment of an archery bow. 
         FIGS. 19-21  show another embodiment, similar to  FIG. 18 , of upper and lower rotatable members at various rotational orientations, such as at-rest, mid-draw and full-draw. 
         FIG. 22  shows another embodiment of an archery bow. 
         FIGS. 23-25  show an embodiment of a rotatable member having an adjustable module at various orientations. 
         FIG. 26  shows an exploded view of an embodiment of a rotatable member and a module comprising a vectoring anchor. 
         FIG. 27  shows an exploded view of another embodiment of a rotatable member comprising a vectoring anchor and having interchangeable modules. 
         FIG. 28  shows another embodiment of an archery bow comprising cams that each have a timing window. 
         FIG. 29  shows a rotatable member of  FIG. 28  in greater detail. 
         FIG. 30  shows an embodiment of a single cam archery bow comprising a vectoring anchor. 
         FIG. 31  shows an embodiment of rotatable members suitable for use in a 1.5 cam bow. 
         FIG. 32  shows an embodiment of a modified pulley or hybrid cam comprising a vectoring anchor. 
         FIG. 33  shows another embodiment of a rotatable member comprising a vectoring anchor. 
         FIG. 34  shows another embodiment of a rotatable member comprising a vectoring anchor. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     While this invention may be embodied in many different forms, there are described in detail herein specific embodiments of the invention. This description is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiments illustrated. 
     For the purposes of this disclosure, like reference numerals in the Figures shall refer to like features unless otherwise indicated. 
     “Archery bow” as used herein is intended to encompass any suitable type of compound archery bow, including single cam bows, CPS bows and/or cam-and-a-half bows, dual cam and/or twin cam bows, crossbows, etc. 
       FIG. 1  shows an embodiment of an archery bow  10  comprising a force vectoring anchor  30 . The vectoring anchor  30  generally allows a force vector applied by a cable  26  to transition with respect to a support point (e.g. an axle  24 ) as the bow is drawn. 
     An archery bow  10  can generally comprise a handle  12 , a first limb  14  and a second limb  16 . Each limb  14 ,  16  can be attached to an end of the handle. Each limb  14 ,  16  further supports a respective rotatable member  20 ,  22 . For example, a first rotatable member  20  can be rotatably supported by a first axle  24 , which is supported by the first limb  14 , and a second rotatable member  22  can be rotatably supported by a second axle  28 , which is supported by the second limb  16 . Thus, each rotatable member  20 ,  22  is rotatably attached to the archery bow  10  and configured for rotation about an axis that can be defined, in some embodiments, by the axle (e.g.  24 ). Each rotatable member  20 ,  22  can comprise a cam, a pulley or any other suitable rotatable member. 
     The archery bow  10  further comprises a bowstring  18 . Each rotatable member  20 ,  22  can comprise a bowstring groove  46  (see e.g.  FIG. 18 ), which will typically extend around at least a portion of its outer perimeter. The bowstring  18  can extend between the first and second rotatable members  20 ,  22 , and at least a portion of the bowstring  18  can be oriented within the groove  46  of both the first and second rotatable members  20 ,  22 . Thus, the groove  46  can comprise a track that pays out bowstring  18  as the bow is drawn, and takes up bowstring  18  as an arrow is launched. As shown in  FIG. 18 , in some embodiments, a bowstring  18  can wrap around substantially the entire periphery of a rotatable member  20  in a groove  46  and then anchor to a bowstring anchor  19 , such as a post. In some embodiments, the bowstring  18  can anchor similarly to the second rotatable member  22 . In some embodiments, for example as shown in  FIG. 1 , the first rotatable member  20  and the second rotatable member  22  can comprise mirror images of one another, and the bowstring  18  take-up and anchoring mechanisms can be mirror images, for example taken across a mirroring axis  70 . A mirroring axis  70  can be orthogonal to a line spanning between the rotatable member supports (e.g. axles  24 ,  28 ) and located midway between the supports/axles as shown on  FIG. 1 . 
     The archery bow  10  further comprises at least one power cable  26 , which can be anchored at one end to a vectoring anchor  30  and can extend to an opposite rotatable member. For example, a power cable  26  can be anchored at a first end  50  to a vectoring anchor  30  associated with the first limb  14  and/or the first rotatable member  20 , and a second end  52  can extend to the second rotatable member  22 . The power cable  26  can be anchored to the second rotatable member  22 , for example attaching to a post  56 . At least a portion of the power cable  26  can be oriented in a power cable take-up track  60  associated with the second rotatable member  22 . As the bowstring  18  is drawn, power cable  26  can be taken up by the power cable take-up track  60 . The specific shape of the power cable take-up track  60  impacts the compounding action of the bow  10 . 
     In some embodiments, for example as shown in  FIG. 1 , the archery bow  10  can comprise a second power cable  27 . The second power cable  27  can be anchored at one end to a second vectoring anchor  31  associated with the second limb  16  and/or the second rotatable member  22 , and extend to the first rotatable member  20 . The second power cable  27  can be anchored to the first rotatable member  20 , for example attaching to a post  56 , and at least a portion of the second power cable  27  can be oriented in a second power cable take-up track  61  associated with the first rotatable member  20 . In some embodiments, the first power cable take-up track  60  and the second power cable take-up track  61  can comprise mirror images of one another, for example taken across mirroring axis  70 . Similarly, the first power cable  26  and second power cable  27  can comprise mirror images of one another, for example taken across mirroring axis  70 . Further, the first vectoring anchor  30  and second vectoring anchor  31  can comprise mirror images of one another, for example taken across mirroring axis  70 . 
     Each vectoring anchor  30 ,  31  can comprise an anchoring structure that is rotatably attached to a rotatable member  20 ,  22 . 
       FIG. 2  shows an example of a rotatable member  20  and a vectoring anchor  30  in greater detail. A first orientation is shown in solid lines, and a second orientation is shown in hidden lines. The rotatable member  20  defines a rotatable member axis  21 , which the rotatable member  20  rotates about when the bowstring is drawn. The rotatable member axis  21  is preferably an axle  24  associated with a limb  14  (see  FIG. 1 ). 
     In some embodiments, the vectoring anchor  30  comprises a first portion  34  that is rotatably attached/engaged to a second portion  36 . In some embodiments, the first portion  34  can be fixedly attached to the rotatable member  20 , and a power cable  26  can be anchored to the second portion  36 . 
     The vectoring anchor  30  defines a center/axis of rotation  40  between the first portion  34  and the second portion  36 . The center of rotation  40  is offset from the rotatable member axis  21 . Thus, as the rotatable member  20  rotates about the rotatable member axis  21 , the center of rotation  40  of the vectoring anchor  30  translocates about the rotatable member axis  21 . The translocation allows an effective anchor point (e.g. the center of rotation  40 ) of the power cable  26 , and the force vector applied by the power cable  26 , to move as the bow is drawn without requiring that the relevant end of the power cable be taken up on a take-up groove/track. In some embodiments, the axis of rotation  40  is parallel to the rotatable member axis  21 . In some embodiments, the center of rotation  40  of the vectoring anchor  30  follows an arcuate path as it translocates about the rotatable member axis  21 . In some embodiments, a distance between the center of rotation  40  and the rotatable member axis  21  comprises a radius of the arcuate path. 
     The vectoring anchor  30  can comprise any suitable type of bearing, such as a plain bearing, a fluid bearing, a magnetic bearing, a needle bearing, a roller bearing, a ball bearing or other rolling element bearing, etc. In some embodiments, each portion  34 ,  36  of the vectoring anchor  30  can define a substantially circular cross-sectional shape. In some embodiments, one or both portions  34 ,  36  of the vectoring anchor  30  can be substantially cylindrical in shape. 
     In some embodiments, the vectoring anchor  30  defines a rotational engagement circumference  35  between the first portion  34  and the second portion  36 , and the rotatable member axis  21  is located within the rotational engagement circumference  35 . For example, in some embodiments, a rotational engagement circumference  35  can comprise a circumference of a circular bearing, and the rotatable member axis  21  is located within the circumference of the circular bearing. In some embodiments, the first portion  34  of the vectoring anchor  30  defines an outer circumference  35 , and the rotatable member axis  21  is located within the outer circumference  35 . 
     In some embodiments, the second portion  36  of the vectoring anchor  30  extends around the outer circumference  35  of the first portion  34 . In some embodiments, the second portion  36  comprises a sheave having a track or groove around its outer periphery. At least a portion of the power cable  26  can be oriented in such a track or groove. 
       FIGS. 3-5  show an embodiment of rotatable members  20 ,  22  at three respective draw orientations. 
       FIG. 3  illustrates a brace or at-rest position. Forces acting upon a rotatable member  20 ,  22  are discussed with respect to the first or upper rotatable member  20 . The bowstring  18 , first power cable  26  and second power cable  27  are all under tension. The vectoring anchor  30  can be configured such that a force vector F p  resulting from the first power cable  26  and a force vector F b  resulting from the bowstring  18  are positioned on opposite sides of the rotatable member axis  21  (e.g. the first axle  24 ). In the embodiment of  FIG. 3 , the second power cable applies a force vector (not illustrated), which can be located on the same side of the rotatable member axis  21  as the first power cable force vector F p . Each string/cable  18 ,  26 ,  27  will apply a moment about the rotatable member axis  21 , and the moment in the counterclockwise direction caused by the bowstring force vector F b  is equal to the sum of the two moments in the clockwise direction resulting from the first power cable force vector F p  and the second power cable force vector (not illustrated). 
       FIG. 4  shows the rotatable members  20 ,  22  of  FIG. 3  oriented at mid-draw. As a user draws back the bowstring  18 , the rotatable members  20 ,  22  rotate appropriately. With respect to the first rotatable member  20 , bowstring  18  is let out of the bowstring groove  46  (see also  FIG. 18 ), and the second power cable  27  is taken up on the second power cable take up track  61 . 
     The vectoring anchor  30  allows an effective anchor point of the first power cable  26  to move with respect to the first rotatable member axis  21  (e.g. the first axle  24 ). The first portion  34  of the vectoring anchor  30  can be fixedly attached to the first rotatable member  20 , and can thus rotate with the rotatable member  20 . The movement causes the center of rotation  40  of the vectoring anchor  30 , and the second portion  36  of the vectoring anchor  30 , to translocate with respect to the first rotatable member axis  21 . In some embodiments, the center of rotation  40  travels in an arcuate path about the first rotatable member axis  21 . 
     As the center of rotation  40  of the vectoring anchor  30  moves, the location and effect of the first power cable force vector F p  changes.  FIG. 4  shows a rotational orientation at which the first power cable force vector F p  passes substantially through the first rotatable member axis  21 . Thus, the moment applied to the first rotatable member  20  about the first rotatable member axis  21  by the first power cable force vector F p  at the rotational orientation shown in  FIG. 4  is approximately zero. It can be noted that as the archery bow  10  is drawn from the brace position illustrated in  FIG. 3  to the mid-draw orientation of  FIG. 4 , the first power cable force vector F p  moves closer to the first rotatable member axis  21 , eventually passing over the first rotatable member axis  21  as shown in  FIG. 4 . Further, the second portion  36  and center of rotation  40  move farther away from the second rotatable member  22 , which effectively works to shorten the length of the first power cable  26 . This increases the energy stored in the bow limbs  14 ,  16 , due to additional flexing and axle  24  displacement, and increases tension in the first power cable  26 . When an archery bow  10  having a vectoring anchor  30  is compared to a similar bow wherein the power cable anchors directly to an axle (e.g.  24 ), the bow  10  having the vectoring anchor  30  is able to store more energy per unit of bowstring draw. 
       FIG. 5  shows the rotatable members  20 ,  22  of  FIGS. 3 and 4  at a full draw orientation. The power cable take-up tracks  60 ,  61  are shaped to allow “let-off,” or a reduction in the force that must be applied to the bowstring  18  to maintain the bow  10  in the fully drawn orientation. 
     The first portion  34  of the vectoring anchor  30  has continued to move with the first rotatable member  20 , which has continued to translocate the second portion  36  and the center of rotation  40 . The first power cable force vector F p  has continued to move with respect to the first rotatable member axis  21  and is now positioned on the “bowstring side” of the first rotatable member axis  21 . A moment applied to the first rotatable member  20  by the first power cable force vector F p  now works in conjunction with the moment applied by the bowstring force vector F b  and against the moment applied by the second power cable  27 . For example, in the first rotatable member  20  of  FIG. 5 , the bowstring force vector F b  and first power cable force vector F p  each apply a moment in the counterclockwise direction, while the moment caused by the second power cable  27  is in the clockwise direction. 
     Thus, in some embodiments, the vectoring anchor  30  allows the first power cable force vector F p  to transition from applying a moment to a rotatable member  20  that initially works against the moment applied by the bowstring  18  in the brace orientation (see  FIG. 3 ) to applying a moment that works with the moment applied by the bowstring  18  at full draw (see  FIG. 5 ). In some embodiments, for example in a bow  10  having a second power cable  27 , the vectoring anchor  30  allows the first power cable force vector F p  to transition from applying a moment to a rotatable member  20  that initially works with the moment applied by the second power cable  27  in the brace orientation (see  FIG. 3 ) to applying a moment that works against the moment applied by second power cable  27  at full draw (see  FIG. 5 ). 
     As previously discussed, the second rotatable member  22  and second vectoring anchor  31  can comprise a mirror image of the first rotatable member  20  and first vectoring anchor  30 . When the bow  10  comprises a twin cam bow, the vectoring anchors  30 ,  31  help maintain the rotatable members  20 ,  22  in alignment without providing a direct mechanical cable connection between the rotatable members  20 ,  22 , for example as might be found in a binary cam bow 
     The vectoring anchor(s)  30 ,  31  are components of a direct feedback system that allows the rotatable members  20 ,  22  to be self-aligning. The system can mitigate a potential imbalance that could result if the rotatable members  20 ,  22  fail to stay rotationally synchronized. 
     Although  FIGS. 3-5  show first and second vectoring anchors  30 ,  31  and first and second power cable take-up tracks  60 ,  61  to one side of the rotatable members  20 ,  22 , these elements can be distributed on different sides of the rotatable members  20 ,  22 . For example, in some embodiments, a first vectoring anchor  30 , first power cable take-up track  60  and first power cable  26  can be located to a first side of the rotatable members  20 ,  22  (e.g. behind the rotatable members  20 ,  22  as shown in  FIG. 3 ), and a second vectoring anchor  31 , second power cable take-up track  61  and second power cable  27  can be located to a second side of the rotatable members  20 ,  22  (e.g. in front of the rotatable members  20 ,  22  as shown in  FIG. 3 ). In some embodiments, a first vectoring anchor  30  can be located to a first side of a first rotatable member  20 , and a first power cable take-up track  60  can be located to a second side of a second rotatable member  22 . The first power cable  26  can span between the first vectoring anchor  30  and first power cable take-up track  60  accordingly, crossing from the first side to the second side. A second vectoring anchor  31  can be located to a first side of the second rotatable member  22 , and a second power cable take-up track  61  can be located to the second side of the first rotatable member  20 . The second power cable  27  can cross from the first side to the second side. 
       FIG. 6-8  illustrate additional embodiments of an archery bow  10  comprising a vectoring anchor  30 . These Figures show that the vectoring anchor  30  is suitable for use with many power cable configurations, and that certain specifics of the bow  10  can be adjusted without departing from the concept of a vectoring anchor  30 . Most elements of  FIGS. 6 and 7  are similar to  FIG. 1 ; however,  FIGS. 6 and 7  show alternative termination configurations for the power cable(s)  26 ,  27 . The first power cable  26  can attach to the second rotatable member  22 , extend upwardly and wrap around the second portion  36  of the first vectoring anchor  30  and connect to another portion of the bow  10 .  FIG. 6  shows a power cable  26  attaching to a post  66  that is attached to a limb  14 .  FIG. 7  shows a power cable  26  attaching to a post  66  that is attached to the handle  12 . In both  FIGS. 6 and 7 , the second power cable  27  can be a mirror image of the first power cable  26 , and the termination mechanism can be similarly mirrored. Most elements of  FIG. 8  are similar to  FIG. 1 ; however,  FIG. 8  shows an alternative routing configuration for the power cable(s)  26 ,  27 . The first power cable  26  can attach to the second rotatable member  22 , extend upwardly and wrap around a pulley  68  and then be anchored to the vectoring anchor  30 . Although the pulley  68  is shown attached to a limb  14 , it could also be attached to other portions of the bow  10 , such as the handle  12 . 
     In another embodiment (not illustrated), referring to  FIGS. 1 and 2 , it is not necessary for the vectoring anchor  30  to be rotatable with respect to the rotatable member  20 . For example, in some embodiments, the vectoring anchor  30  can be fixedly attached to the rotatable member  20 . The power cable  26  can be rotatable with respect to the vectoring anchor  30  about a center of rotation  40 , for example being configured to slide or slip with respect to the vectoring anchor  30  as the bow is drawn. As such, the vectoring anchor  30  need not comprise first and second portions  34 ,  36  rotatable with respect to one another as previously described. Thus, in some embodiments, the structure previously described first and second portions  34 ,  36  can be fixedly attached to one another, comprising a unitary structure. The vectoring anchor  30  will then rotate with the rotatable member  30 . In some embodiments, the vectoring anchor  30  can comprise a material conducive to allowing rotation between the power cable  26  and the vectoring anchor  30 . For example, one or more surfaces of the vectoring anchor  30  that contact the power cable  26  can comprise a low friction material, such as a ceramic material or a thermoplastic material such as nylon, high-density polyethylene, polytetrefluoroethylene or the like. In some embodiments, a body of a rotatable member  20  can comprise a first material and a contacting surface of a vectoring anchor  30  can comprise a second material having a lower coefficient of friction. In some embodiments, a lubricant can be used between the power cable  26  and vectoring anchor  30 , such as oil or a non-liquid such as graphite, molybdenum disulfide, tungsten disulfide or the like. The analysis of moment forces applied to the rotatable member  20 , described above with respect to  FIGS. 3-5 , will be substantially the same for a vectoring anchor  30  that is fixedly attached to the rotatable member  20  and a power cable  26  configured to rotate with respect to the vectoring anchor  30 . 
     Any suitable embodiment described herein as having a vectoring anchor  30  comprising first and second portions  34 ,  36  rotatable with respect to one another can alternatively comprise a vectoring anchor  30  that is fixedly attached to a rotatable member  20  and a power cable  26  that is rotatable with respect to the vectoring anchor  30 . 
       FIG. 9  shows a bow  10  comprising another embodiment of a vectoring anchor  30 . Most elements of  FIG. 9  are similar to  FIG. 1 ; however,  FIG. 9  shows an alternative configuration for the second portion  36  of the vectoring anchor  30 . In some embodiments, the vectoring anchor  30  comprises an extension member  48  such as a plate. In some embodiment, the plate  48  comprises the second portion  36  of the vectoring anchor  30 . 
       FIG. 10  shows the rotatable members  20 ,  22  of  FIG. 9  in greater detail. A first portion  34  of the vectoring anchor  30  can be fixedly attached to the rotatable member  20 . The first portion  34  can be rotatably attached/engaged to the second portion  36 /plate  48 . The plate  48  extends around the first portion  34  similar to the second portion  36  shown in  FIGS. 3-6 , and further extends away from the first portion  34 . The plate  48  comprises an anchoring mechanism  49 , such as a post, to which the first power cable  26  can be anchored. Any suitable anchoring mechanism  49  can be used. For example, when the anchoring mechanism  49  comprises a post or protrusion, a portion of the power cable  26  can extend around the protrusion. In some embodiments, an anchoring mechanism  49  can comprise an aperture in the plate  48 , and the power cable  26  can be tied through the aperture. In some embodiments, an anchoring mechanism  49  can comprise a slot or groove in the plate  48 , and the power cable  26  can be anchored to a spool that engages the slot or groove. The plate  48  with anchoring mechanism  49  allows for better serviceability of the archery bow  10 , as the power cable  26  can be attached and detached without removal of a rotatable member  20 , axle  24 , etc. 
     As shown in  FIG. 10 , the plate  48  comprises an extension member that is rigid and capable of transferring tensile and compressive forces. Thus, in some embodiments, a plate  48  comprises a rigid extension member. In some other embodiments (not shown), an alternate extension member  48  could be used that would be considered to transmit only tensile forces. For example, a plate  48  of  FIG. 10  could be substituted with a tension member such as a loop of wire, cable, etc., attached between the second portion  36  of the vectoring anchor  30  and the power cable  26 . 
     The rotational interaction between the first portion  34  and second portion  36 /plate  48  can be similar to the embodiment shown in  FIG. 3-6 . Thus, a center of rotation  40  between the first portion  34  and the plate  48  can be located within an outer circumference  35  of the first portion  34 . The rotatable member axis  21  can be located within the outer circumference  35 , and the center of rotation  40  can be offset from the rotatable member axis  21 . 
     The plate  48  can further be shaped to be symmetrical across the power cable force vector F p . Thus, a first half  58  of the plate  48  can be a mirror image of a second half  59  taken across the power cable force vector F p . In some embodiments, a plate axis  62  can extend between the center of rotation  40  and an axis  51  of the anchoring member  49 . A centroid  54  of the plate  48  can also be located on the plate axis  62 , and the first half  58  of the plate  48  can be a mirror image of the second half  59  taken across the plate axis  62 . In some other embodiments, a plate  48  can be asymmetrical across the power cable force vector F p , for example as discussed below with respect to  FIG. 15 . 
       FIG. 10  shows an example of rotatable members  20 ,  22  in the brace condition. Forces acting upon the rotatable members  20 ,  22  are similar to the forces described with respect to  FIG. 3 . The first power cable force vector F p  applies a moment to the first rotatable member  20  about the first rotatable member axis  21  that acts in conjunction with a moment applied by the second power cable  27 , and against a moment applied by the bowstring  18 . 
       FIGS. 11 and 12  show the rotatable members  20 ,  22  at mid-draw and full draw orientations, respectively. Forces acting upon the rotatable members  20 ,  22  in these Figures are similar to the forces described with respect to  FIGS. 4 and 5 . As the bowstring  18  is drawn, the location of the first power cable force vector F p  shifts from one side of the first rotatable member axis  21  to the other. As shown in  FIG. 11 , the first power cable force vector F p  is moving through a substantially neutral position where it does not apply a moment to the first rotatable member  20  about the first rotatable member axis  21 . In  FIG. 12 , the first power cable force vector F p  has shifted to apply a moment about the first rotatable member axis  21  in the counter-clockwise direction, which works in conjunction with a moment applied by the bowstring  18  and against a moment applied by the second power cable  27 . 
     Although  FIGS. 10-12  show first and second vectoring anchors  30 ,  31  and first and second power cable take-up tracks  60 ,  61  to one side of the rotatable members  20 ,  22 , these elements can be distributed on different sides of the rotatable members  20 ,  22 . For example,  FIG. 13  shows a vectoring anchor  30  located to a first side  15  of a rotatable member  20 . The vectoring anchor  30  comprises a plate  48 , and a first power cable  26  is attached to an anchoring mechanism  49 . The first power cable  26  can extend downwardly and be connected to a cam having take-up track, for example on a second rotatable member (not shown). The lower cam and take-up track could be located on either side (e.g.  15 ,  16 ) of the second rotatable member.  FIG. 13  further shows a second power cable  27  anchored to a power cable cam portion  44  located to a second side  16  of the rotatable member  20 , wherein the cam portion  44  comprises a take-up track  61 . The second power cable  27  can extend downwardly and be anchored to a second vectoring anchor (not shown), which could be located on either side (e.g.  15 ,  16 ) of a second rotatable member. 
       FIG. 14  shows another embodiment of a vectoring anchor  30  configuration. In some embodiments, multiple vectoring anchors  30  can be used in conjunction with a single rotatable member  20 . Although  FIG. 14  shows vectoring anchors  30  that each comprise a plate  48 , the concept of multiple vectoring anchors  30  associated with a common rotatable member  20  or axle  24  can be applied to any embodiment. A first vectoring anchor  30  and a second vectoring anchor  31  can each be rotatably attached to a rotatable member  20 . For example, a first portion  34  (see e.g.  FIGS. 2 and 10 ) of either vectoring anchor  30 ,  31  can be fixedly attached to the rotatable member  20 , and a second portion  36  can be rotatably attached to each first portion  34 . The first vectoring anchor  30  can be located to a first side  15  of the rotatable member  20 , and the second vectoring anchor  31  can be located to a second side  16  of the rotatable member  20 . The first power cable  26  can attach to the second portion  36  (e.g. the plate  48  as shown in  FIG. 14 ) of each vectoring anchor  30 . In some embodiments, a power cable  26  can split into a first portion  71  and a second portion  72  (e.g. split yoke). The first portion  71  can be anchored to the first vectoring anchor  30 , and the second portion  72  can be anchored to the second vectoring anchor  31 . In some embodiments, the second portions  36 /plates  48  of the first and second vectoring anchors  30 ,  31  can be attached to one another, for example by a connecting member  76 , such as a pin. When the second portions  36 /plates  48  are attached, the power cable  26  can be anchored at a single location. 
     When multiple vectoring anchors  30 ,  31  are aligned on a common center/axis of rotation  40 , the configuration can also be considered a single vectoring anchor assembly comprising a first portion  80  and a second portion  81 , wherein each portion  80 ,  81  is rotatable with respect to the rotatable member  20 . 
     In some embodiments, a single shaped plate can function as the two plates  48  shown in  FIG. 14 . Thus, in some embodiments, a vectoring anchor  30  can comprise a plate that is rotatably engaged to a rotatable member  20  at more than one location, wherein an axis of rotation (e.g. center of rotation  40 —see  FIG. 10 ) of the vectoring anchor  30  is offset from the rotatable member axis  21  (e.g. axle  24 ). 
       FIG. 15  shows another embodiment of a vectoring anchor  30  as applied to first and second rotatable members  20 ,  22 . Each vectoring anchor  30  is rotatably attached to a rotatable member  20 ,  22 . A vectoring anchor  30  can comprise a first portion  34  that is fixedly attached to a rotatable member  20 ,  22  and a second portion  36  that is rotatably attached to the first portion  34 . An axis of rotation  40  between the first and second portions  34 ,  36  of the vectoring anchor  30  is offset from the rotatable member axis  21  (e.g. the axle  24 ). In some embodiments, the axis of rotation  40  is parallel to the rotatable member axis  21 . 
     In some embodiments, the vectoring anchor  30  defines a rotational engagement circumference  35  between the first portion  34  and the second portion  36 , and the rotatable member axis  21  is located outside of the rotational engagement circumference  35 . 
     In some embodiments, a vectoring anchor  30  comprises an extension member  48  such as a plate, which can be asymmetric across at least one axis. In some embodiments, a plate  48  is asymmetric across the power cable force vector F p . In some embodiments, a plate  48  comprises a first portion  63  that is oriented about the axis of rotation  40  and a second portion  64 , such as an arm portion, that extends away from the first portion  63  and anchors to the associated power cable (e.g.  27 ). In some embodiments, an arm portion  64  extends from the first portion  63  of the plate in a direction away from the associated power cable (e.g.  27 ), around the rotatable member axis  21  (e.g. axle  28 ) in a direction toward the bowstring  18 , then toward the associated power cable (e.g.  27 ) and away from the bowstring  18 . This configuration creates a groove  65  in the plate, defined between the first portion  63  and the arm portion  64 , through which the rotatable member axis  21  (e.g. axle  28 ) passes as the bowstring  18  is drawn and the rotatable members  20 ,  22  rotate. 
     In some other embodiments, a plate  48  can be symmetric across the power cable force vector F p , for example as discussed previously with respect to  FIG. 10 . A more symmetrical plate can reduce bending stresses that can exist in an asymmetrical plate. It should be noted that  FIG. 10  shows an embodiment of a symmetrical plate  48  wherein the rotatable member axis  21  is oriented within an area defined by the first portion  34  of the vectoring anchor  30  (e.g. within a circumference of the first portion  34 ), whereas  FIG. 15  shows an embodiment of an asymmetrical plate  48  wherein the rotatable member axis  21  is oriented outside of an area defined by the first portion  34  of the vectoring anchor  30 . Symmetrical or asymmetrical plates  48  can be used with either type of rotatable member axis  21  orientation. For example, the asymmetrical plate of  FIG. 15  could be combined with a mirror image of itself taken across the power cable force vector F p , resulting in a heart-shaped plate. Different plate  48  embodiments allow for differences in strength, weight and aesthetics. Further, a plate  48  associated with a first rotatable member  20  can be different from a plate  48  associated with a second rotatable member  22 . 
       FIG. 16  shows the rotatable members  20 ,  22  of  FIG. 15  in a mid-draw orientation. As a rotatable member  20 ,  22  rotates, the center of rotation  40  of each vectoring anchor  30  translocates about the associated rotatable member axis  21 . As the rotatable member  20  rotates from a brace orientation as shown in  FIG. 15  to a mid-draw orientation, the power cable force vector F p  can move closer to the rotatable member axis  21 . Thus, a moment arm between the rotatable member axis  21  and the power cable force vector F p  can be reduced in length. As the rotatable member  20  continues to rotate, the power cable force vector F p  can pass over/through the rotatable member axis  21 . 
       FIG. 17  shows the rotatable members  20 ,  22  of  FIGS. 15 and 16  at a full draw orientation. The power cable force vector F p  has moved to the bowstring  18  side of the rotatable member axis  21 . Thus, the bowstring  18  and first power cable  26  apply moments to the rotatable member  20  in a common direction, for example counterclockwise. The moments from the bowstring  18  and first power cable  26  act against a moment applied by the second power cable  27  in the opposite direction, for example clockwise. 
     Although  FIGS. 15-17  show a plate  48  and a second power cable take-up track  61  oriented to a common side of a rotatable member, other embodiments are possible, for example as described herein with respect to  FIGS. 3-5 and 10-14 . For example, a plate  48  and second power cable take-up track  61  can be located on opposite sides of a rotatable member. 
       FIG. 18  shows a three-dimensional view of another embodiment of a rotatable member  20  having an embodiment of a vectoring anchor  30 . The rotatable member  20  comprises a bowstring groove  46  that extends around its outer periphery. The rotatable member  20  is arranged to rotate about rotatable member axis  21 , for example being supported by an axle  24 . The rotatable member  20  can comprise a take-up track (not visible in  FIG. 18 ), which can take-up a cable, such as a second power cable  27  as the bowstring  18  is drawn. 
     In some embodiments, a vectoring anchor  30  or a portion of a vectoring anchor  30  can be located laterally outward from a bow limb  14 . Thus, a power cable  26  can anchor to the vectoring anchor  30  laterally outward from the bow limb  14 , such that a portion of the limb  14  can be oriented between the rotatable member  20  and the power cable  26  in at least some rotatable member  20  orientations. 
     In some embodiments, a vectoring anchor  30  can comprise two portions  80 ,  81  that are oriented on opposite sides of the rotatable member  20 . Each portion  80 ,  81  can be rotatable with respect to the rotatable member  20 , and both portions  80 ,  81  can be aligned on a common axis of rotation  40 . A power cable  26  can split into a first portion  71  and a second portion  72 , and each portion  71 ,  72  can be anchored to a respective vectoring anchor portion  80 ,  81 . In some embodiments, the cable first portion  71  and vectoring anchor first portion  80  can comprise a mirror image of the cable second portion  72  and vectoring anchor second portion  81 , which helps balance the forces applied to the rotatable member  20  by the power cable  26 . A multiple portion  80 ,  81  vectoring anchor assembly  30  can also be described as two separate vectoring anchors  30 ,  31 . 
     In some embodiments, a rotatable member  20  can comprise a post  78  that extends outward in a lateral direction. For example, a central axis of the post  78  can be oriented parallel to the rotatable member axis  21 . A vectoring anchor  30  can be located at an end of the post  78 . In some embodiments, a post  78  can extend laterally on each side of a rotatable member  20  as shown in  FIG. 18 , and the two posts  78  can be coaxially aligned. In some embodiments, a central axis of a post  78  is collinear with the center of rotation  40  of a vectoring anchor  30 . In some embodiments, a post  78  can also be characterized as a portion of a vectoring anchor  30 . 
       FIGS. 19-21  show another embodiment of rotatable members  20 ,  22  various rotational orientations. Each rotatable member  20 ,  22  comprises a vectoring anchor  30 , such as a vectoring anchor  30  comprising first and second portions  80 ,  81  as described with respect to  FIG. 18 . The vectoring anchor  30  can comprise portions  80 ,  81  that are located laterally outward from the limb  14 , such that a portion of the limb  14  can be located between a portion of the power cable  26  and the rotatable member  20 . 
       FIG. 19  shows the rotatable members  20 ,  22  in the brace condition. Forces acting upon the rotatable members  20 ,  22  are similar to the forces described with respect to  FIG. 3 . The first power cable force vector F p  applies a moment to the first rotatable member  20  about the first rotatable member axis  21  that acts in conjunction with a moment applied by the second power cable  27 , and against a moment applied by the bowstring  18 . 
       FIGS. 20 and 21  show the rotatable members  20 ,  22  at mid-draw and full draw orientations, respectively. Forces acting upon the rotatable members  20 ,  22  in these Figures are similar to the forces described with respect to  FIGS. 4 and 5 . As the bowstring  18  is drawn, the location of the first power cable force vector F p  shifts from one side of the first rotatable member axis  21  to the other. As shown in  FIG. 20 , the first power cable force vector F p  has already moved past a substantially neutral moment position and is applying a moment to the rotatable member  20  in the counter-clockwise direction. This moment works in conjunction with a counter-clockwise moment applied by the bowstring  18 , and against a clockwise moment applied by the second power cable  27 . 
     In another embodiment (not illustrated), referring to  FIGS. 18-21 , it is not necessary for the vectoring anchor  30  to be rotatable with respect to the rotatable member  20 . For example, in some embodiments, the vectoring anchor  30  can be fixedly attached to the rotatable member  20 , and the power cable  26  can be rotatable with respect to the vectoring anchor  30  about a center of rotation  40 , for example being configured to slide or slip with respect to the vectoring anchor  30  as the bow is drawn, as previously discussed herein. 
       FIG. 22  shows another embodiment of a bow  10  comprising vectoring anchors  30 ,  31 . The bow  10  is similar in many ways to the embodiment illustrated in  FIG. 1 ; however,  FIG. 22  shows an alternate embodiment of rotatable members  20 ,  22 .  FIG. 22  shows an alternate shape for a power cable take-up track  61 , and an alternate shape for an outer periphery of the rotatable member  20  when compared to  FIG. 1 . The outer periphery can comprise a track for the bowstring  18 . Thus, the configuration of a rotatable member  20  can be adjusted to achieve desirable characteristics in draw force and let-off profile by adjusting the cam shapes to adjust the specific moments applied to the rotatable member  20  by the various cables  18 ,  26 ,  27 . 
       FIG. 22  shows that the vectoring anchor  30  concept can be applied to many configurations of bows  10 , and that different embodiments of rotatable members  20  can be used without departing from the invention. The vectoring anchor  30  concept is applicable to any suitable type of compound archery bow, including single cam bows, CPS bows, cam-and-a-half bows, dual and twin cam bows, crossbows, etc. Some of these types of bows are discussed in greater detail below. 
       FIG. 23  shows another embodiment of a rotatable member  22  that utilizes a vectoring anchor  30 . In some embodiments, a module  90  can be attached to the rotatable member  22 , and the module  90  can comprise a vectoring anchor  30 . As such, the vectoring anchor  30  can comprise a first portion  34  that is rotatable with respect to a second portion  36  about a center of rotation  40 . The first portion  34  can be fixedly attached to the module  90 . A cable, such as a second power cable  27 , can be anchored to the second portion  36 . 
     The module  90  further comprises a cable take-up track  60 . As the rotatable member  22  is rotated as the bowstring  18  is drawn, a cable such as a power cable  26  can be taken up by the cable take-up track  60 . The cable take-up track  60  can comprise a power let-off portion  67 , wherein the amount of force required to keep the bowstring  18  drawn is reduced as the power cable  26  is taken up in the cable take-up track  60  and approaches the power let-off portion  67 . A person of ordinary skill in the art will recognize that certain properties of the bow, such as the draw force profile, can be adjusted by varying the specific shape and orientation of the cable take-up track  60 , for example in relation to the bowstring  18  payout track. 
     In some embodiments, a module  60  can be repositioned with respect to the rotatable member  22 . For example, in some embodiments, a module  60  can be rotated about the rotatable member axis  21 . As such, the module  60  can be configured for attachment to the rotatable member  22  in multiple orientations. In some embodiments, a fastener  85  such as a machine screw can be used to fasten the module  60  to the rotatable member  22 . The rotatable member  22  can comprise a fastener receiving portion, such as a threaded aperture. In some embodiments, a module  60  comprises a plurality of apertures  92 , wherein each aperture  92  allows the module  60  to be attached to the rotatable member  22  at a different rotational orientation. When a module  60  comprises a vectoring anchor  30 , the location of the center of rotation  40  can be adjusted along with the orientation of the cable take-up track  60 . 
     The rotatable member  22  can comprise a power cable terminal  56 , such as a post, to which the power cable  26  can be anchored. The power cable  26  can be anchored to a groove in the post (not visible in  FIG. 23 ), and the cable take-up track  60  and the groove can be oriented on a common plane. 
       FIG. 24  shows the rotatable member  22  and module  90  of  FIG. 23  in an alternate configuration. The fastener  85  is oriented in the first of thirteen fastener apertures  92 . In this orientation, the let-off portion  67  of the cable take-up track  60  is oriented closest to the power cable  26  of any module  90  orientation, such that the distance along the cable take-up track  60  between a brace condition power cable contact point  77  and the let-off portion  67  is the least of any module  90  orientation. This orientation results in the minimum bow draw length of an adjustable draw length range provided by the adjustable module  90 . 
       FIG. 25  shows the rotatable member  22  and module  90  of  FIG. 23  in an alternate configuration. The fastener  85  is oriented in the last of thirteen fastener apertures  92 . In this orientation, the let-off portion  67  of the cable take-up track  60  is oriented farthest from the power cable  26  of any module  90  orientation, such that the distance along the cable take-up track  60  between a brace condition power cable contact point  77  and the let-off portion  67  is the greatest of any module  90  orientation. This orientation results in the maximum bow draw length of an adjustable draw length range provided by the adjustable module  90 . 
       FIG. 26  shows an exploded view of a rotatable member  22 , module  90  and vectoring anchor  30  similar to that of  FIG. 23 . The rotatable member  22  comprises a hub  88  that can be received in a hub aperture  94  of the module  90 . In some embodiments, a central axis of the hub  88  comprises the rotatable member axis  21 . The module  90  is rotatable about the hub  88 , and can be fixedly attached to the rotatable member  22  with the fastener  85 . In some embodiments, the fastener  85  can extend through an aperture  86  and engage a portion of the module  90 , such as a threaded aperture  92 . 
     The vectoring anchor  30  can comprise a first portion  34  rotatable with respect to a second portion  36 . In some embodiments, the first portion  34  and second portion  36  comprise a bearing, such as a rolling element bearing. The first portion  34  can be attached to module  90 . In some embodiments, the first portion  34  can engage a raised hub  96  on the module  90 . In some embodiments, the vectoring anchor  30  can comprise a sheave  33  that defines a track or groove about its outer periphery. The sheave  33  can be attached to said second portion  36 . 
     Although  FIGS. 23-26  illustrate a single module  90  that is capable of multiple orientations, a rotatable member  22  can also be used in conjunction with a plurality of replaceable modules, for example as described with respect to  FIG. 27 . 
       FIG. 27  shows another embodiment of a rotatable member  22  comprising a vectoring anchor  30 . This embodiment allows for the use of adjustable or replaceable modules  90 ; however, adjustment of the module(s)  90  does not adjust the orientation of the vectoring anchor  30 . The rotatable member  22  can comprise a stalk  89  and a raised hub  88 . The raised hub  88  can engage the vectoring anchor  30 . A module  90  can be attached to the rotatable member  22 . For example, a module  90  can be oriented between the main body and the raised hub  88  of the rotatable member  22 , such that an abutting portion  97  of the module  90  abuts the stalk  89 . 
     A module  90  can comprise a plurality of apertures  92 , for example as shown in  FIG. 23 , which allow for a plurality of fixed orientations with respect to the rotatable member  22 . Further, a plurality of separate modules  90  can be used, wherein the modules  90  are interchangeable. Thus, each module  90  provides for a different cable take-up track  60  orientation.  FIG. 27  shows thirteen interchangeable modules  90 , wherein each module  90  provides bow characteristics similar to a particular aperture  92 /orientation setting of the adjustable module  90  shown in  FIG. 23 . In some embodiments, different modules  90  comprise the same cable take-up track  60  shape. In some embodiments, different modules  90  comprise different cable take-up track  60  shapes, such that various characteristics of the bow can be adjusted to a greater degree. 
     The module  90  embodiments shown in  FIGS. 23-27  all allow for adjustment/replacement of the module  90  without requiring removal of the power cable(s)  26 ,  27 . 
     A person of ordinary skill in the art will recognize that adjustable and interchangeable modules  90  allow for many characteristics of a bow to be adjusted, such as draw length, draw force, peak draw weight, draw force let-off and more generally the overall draw force profile curve. Benefits of such modules  90  are discussed in U.S. Pat. No. 4,461,267, U.S. Pat. No. 4,515,142, U.S. Pat. No. 4,519,374, U.S. Pat. No. 4,774,927, U.S. Pat. No. 4,967,721, U.S. Pat. No. 5,678,529, U.S. Pat. No. 5,782,229, U.S. Pat. No. 5,934,265, U.S. Pat. No. 5,960,778, U.S. Pat. No. 6,082,347, U.S. Pat. No. 6,516,790, U.S. Pat. No. 6,990,970 and U.S. Pat. No. 6,994,079, the entire disclosures of which are hereby incorporated herein in their entireties. 
       FIG. 28  shows another embodiment of a bow  10  comprising a vectoring anchor  30 . In some embodiments, a rotatable member  20 ,  22  can comprise a timing window  42 . A timing window  42  can comprise an aperture in the rotatable member  20 ,  22  through which a power cable  26 ,  27  can be visible. The timing window  42  can be used to verify that the upper rotatable member  20  and the lower rotatable member  22  are in proper rotational alignment. For example, when properly aligned, a power cable  26  can be centered in the timing window  42 . Desirably a distance across the timing window  42  is larger than a diameter of the cable  26  but also small enough that it is not difficult to perceive when the cable  26  is centered in the timing window  42 . For example, in some embodiments, a distance across the timing window  42  can range from one to four times the diameter of the cable  26 . 
       FIG. 29  shows the upper rotatable member  20  of  FIG. 28  in greater detail. 
       FIG. 30  shows another embodiment of a bow  10  comprising a vectoring anchor  30 , wherein the bow  10  comprises a single cam bow. As such, one rotatable member  22  comprises a cam  43  and the other rotatable member  20  comprises a pulley  23 . A cable comprises a bowstring portion  18  and a second portion  38 , wherein the bowstring portion  18  is anchored to the cam  43  and extends upward around a portion of the pulley  23  and terminates at the pulley  23 . The second portion  38  of the cable engages a portion of a take-up track on the pulley  23  prior to extending downwardly from the pulley  23  and attaching to the cam  43 . The second portion  38  can comprise a control cable and can be oriented in a payout track  82 . In some embodiments, a pulley  23  comprises a vectoring anchor  30 . A power cable  26  can be anchored at one end to the vectoring anchor  30 , and can be anchored at the other end to the cam  43  proximate to a take-up track  60 . 
       FIG. 31  shows a further embodiment rotatable members  20 ,  22  suitable for use in a bow  10  comprising a vectoring anchor  30 , wherein the bow  10  comprises what is known in the industry as a 1.5 cam or hybrid cam bow. Example of 1.5 cam style bows are described, for example, in U.S. Pat. No. 5,934,265 and U.S. Pat. No. 6,082,347, the entire disclosures of which are hereby incorporated herein by reference in their entireties. One rotatable member  22  comprises a cam  43  and the other rotatable member  20  comprises a modified pulley or hybrid cam  83 . In some embodiments, the cam  43  can be similar to the cam  43  of  FIG. 30 . 
     A bowstring  18  is anchored to the cam  43  at one end and is anchored to the hybrid cam  83  at the other end. Each end can be oriented in a payout track included on the cam  43  or hybrid cam  83 . A control cable  39  can be attached at one end to the hybrid cam  83  proximate to a take-up track  69 , and can be attached at the other end to the cam  43  and oriented in a payout track  82 . In some embodiments, a hybrid cam  83  comprises a vectoring anchor  30 . A power cable  26  can be anchored at one end to the vectoring anchor  30 , and can be anchored at the other end to the cam  43  proximate to a take-up track  60 . In some embodiments, a hybrid cam  83  comprises a timing window  42 , and a portion of the control cable  39  can be visible through the timing window  42 . The cam  43  can also comprise a timing window  42 , wherein a portion of the power cable  26  can be visible through the timing window  42 . 
       FIG. 32  shows the modified pulley/hybrid cam  83  of  FIG. 31  in greater detail. 
       FIG. 33  shows another embodiment of a rotatable member  20  comprising a vectoring anchor  30 . The rotatable member  20  comprises a first track  46  about its outer periphery. The first track  46  can comprise a bowstring payout track. The rotatable member further comprises a second track  69  about its outer periphery. The second track  69  can comprise a cable take-up track, such as a control cable take-up track. In some embodiments, the first track  46  and second track  69  can be concentric, for example being centered upon the rotatable member axis  21 . 
     The rotatable member  20  can further comprise a hub  88  that engages the vectoring anchor  30 . 
       FIG. 34  shows another embodiment of a rotatable member  20  comprising a vectoring anchor  30 . The rotatable member  20  comprises a first track  46  about its outer periphery. The first track  46  can comprise a bowstring payout track. The rotatable member further comprises a second track  69 . The second track  69  can comprise a cable take-up track, such as a control cable take-up track. In some embodiments, the first track  46  and second track  69  can be concentric, for example being centered upon the rotatable member axis  21 . The second track  69  can define a radius that is different from that of the first track  46 . For example, as shown in  FIG. 34 , the second track  69  can have a smaller radius. 
     In various embodiments, the second track  69  can have a length that is less than, equal to or greater than the length of the first track  46 . 
     In some embodiments, the first track  46  and second track  69  can be concentric with one another, wherein their center is offset from the rotatable member axis  21 . 
     In some embodiments, the first track  46  and second track  69  can each define eccentric paths, which can be different from one another. Various configurations of the first track  46  and second track  69 , when used in a bow with a cam  43 , can allow for a bow  10  that exhibits a nock point that travels in a straight line, for example as discussed in U.S. Pat. No. 5,505,185 and U.S. Pat. No. 6,666,202, the entire disclosures of which are hereby incorporated herein by reference in their entireties. 
     In some embodiments, a rotatable member  20  can be described according to the following numbered paragraphs. 
     1. A rotatable member for use with a compound archery bow comprising:
     a body configured for rotation about a rotatable member axis; and   a cable anchor attached to said body and rotatable with respect to said body about an anchor axis, said anchor axis offset from said rotatable member axis.
 
2. The rotatable member of paragraph 1, wherein said cable anchor comprises a first portion rotatable with respect to a second portion, said first portion fixedly attached to said body.
 
3. The rotatable member of paragraph 2, wherein said second portion comprises an extension member.
 
4. The rotatable member of paragraph 3, wherein said extension member comprises an anchoring mechanism offset from said anchor axis, said anchoring mechanism configured for anchoring a cable thereto.
 
5. The rotatable member of paragraph 4, wherein said extension member is symmetrical across a line extending between a center of said anchoring mechanism and said anchor axis.
 
6. The rotatable member of paragraph 2, wherein said first portion comprises a post.
 
7. The rotatable member of paragraph 2, wherein said second portion comprises a sheave.
 
8. The rotatable member of paragraph 1, wherein said cable anchor comprises a rolling element bearing.
 
9. The rotatable member of paragraph 1, wherein said cable anchor comprises a bearing that defines a circumference.
 
10. The rotatable member of paragraph 9, wherein said rotatable member axis is oriented within said circumference.
 
11. The rotatable member of paragraph 1, wherein said first rotatable member axis is parallel to said anchor axis.
 
12. The rotatable member of paragraph 1, further comprising a second cable anchor, said second cable anchor attached to said body and rotatable with respect to said body about said anchor axis.
 
13. The rotatable member of paragraph 12, wherein said cable anchor and said second cable anchor are located on opposite sides of said body.
 
14. The rotatable member of paragraph 12, wherein said second cable anchor comprises a first portion rotatable with respect to a second portion, said first portion fixedly attached to said body.
 
15. The rotatable member of paragraph 14, wherein said second portion comprises a sheave.
 
16. The rotatable member of paragraph 12, wherein said second cable anchor comprises a rolling element bearing.
 
17. The rotatable member of paragraph 1, further comprising a bowstring payout track.
 
18. The rotatable member of paragraph 17, wherein said bowstring payout track defines a curve about said rotatable member axis, said curve having a constant radius.
 
19. The rotatable member of paragraph 17, wherein said bowstring payout track defines a curve that extends eccentrically about said rotatable member axis.
 
20. The rotatable member of paragraph 17, further comprising a cable take-up track.
 
21. The rotatable member of paragraph 20, wherein said cable take-up track defines a curve about said rotatable member axis, said curve having a constant radius.
 
22. The rotatable member of paragraph 20, wherein said cable take-up track defines a curve that extends eccentrically about said rotatable member axis.
 
23. The rotatable member of paragraph 20, wherein said cable take-up track comprises a power let-off cam track.
 
24. The rotatable member of paragraph 20, wherein said cable take-up track is concentric with said bowstring payout track.
 
25. The rotatable member of paragraph 24, wherein a radius of said cable take-up track is different from a radius of said bowstring payout track.
 
26. The rotatable member of paragraph 1, wherein said rotatable member comprises a cam.
 
27. The rotatable member of paragraph 1, wherein said rotatable member comprises a pulley.
 
28. The rotatable member of paragraph 1, further comprising a module, the module comprising a cable take-up track.
 
29. The rotatable member of paragraph 28, wherein said module comprises a power let-off cam.
 
30. The rotatable member of paragraph 28, wherein said module is attached to said rotatable member with a fastener.
 
31. The rotatable member of paragraph 28, wherein said module is adjustable with respect to said rotatable member.
 
32. The rotatable member of paragraph 31, wherein said module is rotatable about said rotatable member axis.
 
33. The rotatable member of paragraph 31, said rotatable member comprising a fastener receiving portion, said module comprising a plurality of fastener apertures.
 
34. The rotatable member of paragraph 28, comprising a plurality of interchangeable modules, wherein each module comprises a fastener aperture and a cable take-up track, an orientation of said cable take-up track with respect to said fastener aperture being different for each module.
 
35. A rotatable member for use with a compound archery bow comprising:
   a body configured for rotation about a rotatable member axis; and   a module configured for attachment to said body, said module comprising a cable anchor rotatable with respect to said module about an anchor axis, said anchor axis offset from said rotatable member axis.
 
36. The rotatable member of paragraph 35, wherein said module comprises a cable take-up track.
 
37. The rotatable member of paragraph 36, further comprising a post attached to said body, said post comprising a groove, said groove and said cable take-up track oriented on a common plane.
 
38. The rotatable member of paragraph 36, wherein said module is rotatable with respect to said body about said rotatable member axis.
 
39. The rotatable member of paragraph 38, wherein said module is configured for attachment to said body at a plurality of rotational orientations.
 
40. The rotatable member of paragraph 38, wherein when said module is rotated with respect to said body, the location of said anchor axis moves with respect to said rotatable member axis.
 
41. The rotatable member of paragraph 36, said body comprising a fastener receiving portion, said module comprising a plurality of fastener apertures.
 
42. The rotatable member of paragraph 35, wherein said cable anchor comprises a first portion rotatable with respect to a second portion, said first portion fixedly attached to said module.
 
43. The rotatable member of paragraph 42, wherein said second portion comprises a plate.
 
44. The rotatable member of paragraph 35, wherein said cable anchor comprises a rolling element bearing.
 
45. The rotatable member of paragraph 35, wherein said cable anchor comprises a bearing that defines a circumference.
 
46. The rotatable member of paragraph 45, wherein said rotatable member axis is oriented within said circumference.
 
47. The rotatable member of paragraph 35, wherein said first rotatable member axis is parallel to said anchor axis.
 
48. The rotatable member of paragraph 35, further comprising a bowstring payout track.
 
49. An archery bow comprising:
   a rotatable member rotatable about a rotatable member axis, the rotatable member comprising a power cable anchor defining an anchor axis, the anchor axis offset from the rotatable member axis; and   a power cable anchored to said power cable anchor, the power cable rotatable with respect to said first rotatable member about said anchor axis.
 
50. The archery bow of paragraph 49, wherein a body portion of the rotatable member comprises a first material and the power cable anchor comprises a second material, the second material having a lower coefficient of friction than the first material.
 
51. The archery bow of paragraph 49, wherein said power cable anchor comprises a thermoplastic.
 
52. The archery bow of paragraph 49, wherein said power cable anchor comprises polytetrafluoroethylene.
 
53. The archery bow of paragraph 49, wherein said power cable anchor comprises a sheave.
 
54. The archery bow of paragraph 53, wherein said rotatable member axis is located within an area defined by said sheave.
 
55. The archery bow of paragraph 49, wherein said power cable anchor comprises an extension member.
 
56. The archery bow of paragraph 55, wherein said extension member comprises a post.
 
57. The archery bow of paragraph 55, wherein said extension member extends outwardly on opposite sides of said rotatable member.
 
58. The archery bow of paragraph 49, wherein said power cable applies a moment to said rotatable member about said rotatable member axis in a first direction when the bow is oriented in a brace condition, and said power cable applies a moment to said rotatable member about said rotatable member axis in a second direction when the bow is oriented in a drawn condition.
 
59. The archery bow of paragraph 49, wherein a bowstring and said anchor axis are located on opposite sides of said rotatable member axis when the bow is oriented in a brace condition, and said bowstring and said anchor axis are located to a common side of said rotatable member axis when the bow is oriented in a drawn condition.
 
60. The archery bow of paragraph 49, wherein said rotatable member axis is parallel to said anchor axis.
 
61. The archery bow of paragraph 49, the rotatable member further comprising a second power cable anchor and a second power cable take-up track, the second power cable take-up track extending eccentrically about said rotatable member axis.
   

     The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives to one of ordinary skill in this field of art. All these alternatives and variations are intended to be included within the scope of the claims where the term “comprising” means “including, but not limited to”. Those familiar with the art may recognize other equivalents to the specific embodiments described herein which equivalents are also intended to be encompassed by the claims. 
     Further, the particular features presented in the dependent claims can be combined with each other in other manners within the scope of the invention such that the invention should be recognized as also specifically directed to other embodiments having any other possible combination of the features of the dependent claims. For instance, for purposes of claim publication, any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim  1  should be alternatively taken as depending from all previous claims). In jurisdictions where multiple dependent claim formats are restricted, the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below. 
     This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.