Patent Publication Number: US-2017370673-A1

Title: Adjustable split-cable assembly for a compound archery bow

Description:
FIELD OF THE INVENTION 
     The field of the present invention relates to compound archery bows. In particular, apparatus and methods are described herein for enabling adjustment of position or alignment of a power cable of a compound archery bow. 
     BACKGROUND 
     For purposes of the present disclosure and appended claims, the terms “compound archery bow” or “compound bow” shall denote an archery bow that uses a levering system, usually comprising one or more cables and pulleys, to bend the limbs as the bow is drawn. A wide variety of compound archery bows are disclosed in the prior art. Categories of compound archery bows include dual-cam bows (including those that employ a Binary Cam System®), single-cam bows, or hybrid-cam bows. Some examples are disclosed in the following patents, publications, and applications, each of which is incorporated by reference as if fully set forth herein:
         U.S. Pat. No. 3,990,425 entitled “Compound bow” issued Nov. 9, 1976 to Ketchum;   U.S. Pat. No. 4,686,955 entitled “Compound archery bows” issued Aug. 18, 1987 to Larson;   U.S. Pat. No. 5,368,006 entitled “Dual-feed single-cam compound bow” issued Nov. 29, 1994 to McPherson;   U.S. Pat. No. 6,871,643 entitled “Eccentric elements for a compound archery bow” issued Mar. 29, 2005 to Cooper et al;   U.S. Pat. No. 6,990,970 entitled “Compound archery bow” issued Jan. 31, 2006 to Darlington;   U.S. Pat. No. 7,350,979 entitled “Dual-cam archery bow with simultaneous power cable take-up and let-out” issued Dec. 11, 2007 to Yehle;   U.S. Pat. No. 7,441,555 entitled “Synchronized compound archery bow” issued Oct. 28, 2008 to Larson;   U.S. Pat. No. 7,770,568 entitled “Dual-cam archery bow with simultaneous power cable take-up and let-out” issued Aug. 10, 2010 to Yehle;   U.S. Pat. No. 8,037,876 entitled “Pulley-and-cable power cable tensioning mechanism for a compound archery bow” issued Oct. 18, 2011 to Yehle;   U.S. Pat. No. 8,082,910 entitled “Pulley assembly for a compound archery bow” issued Dec. 27, 2011 to Yehle;   U.S. Pat. No. 8,181,638 entitled “Eccentric power cable let-out mechanism for a compound archery bow” issued May 22, 2012 to Yehle;   U.S. Pat. No. 8,469,013 entitled “Cable take-up or let-out mechanism for a compound archery bow” issued Jun. 25, 2013 to Obteshka et al;   U.S. Pat. No. 8,739,769 entitled “Cable take-up or let-out mechanism for a compound archery bow” issued Jun. 3, 2014 to Obteshka et al;   U.S. Pat. No. 9,347,730 entitled “Adjustable pulley assembly for a compound archery bow” issued May 24, 2016 to Obteshka;   U.S. non-provisional application Ser. No. 14/591,007 entitled “Adjustable pulley assembly for a compound archery bow” filed Jan. 7, 2015 in the names of Hyde et al;   U.S. non-provisional application Ser. No. 14/797,072 entitled “Adjustable pulley assembly for a compound archery bow” filed Jul. 11, 2015 in the name of Obteshka; and   U.S. non-provisional application Ser. No. 15/091,572 entitled “Adjustable pulley assembly for a compound archery bow” filed Apr. 6, 2016 in the names of Obteshka et al.       

     Typically a compound archery bow includes one or two so-called power cables, one in a single- or hybrid-cam bow or two in a dual-cam bow. The examples shown in the drawings are dual-cam bows employing a Binary Cam System®. Each power cable is engaged at one end to be taken up by a power cable take-up mechanism on a corresponding pulley member mounted on one of the bow limbs. The other end is coupled to the bow (usually to the other limb or to an axle or pulley member on the other limb). As the bow is drawn and the pulley members rotate, take-up of the power cable causes deformation of the bow limbs, usually by pulling them toward one another, so as to store energy in the bow. That stored energy is released when the bow is shot and the bow limbs return to their initial shapes. Consequently, the power cable is under considerable tension when the bow is drawn, and that tension produces forces and torques on the pulley members and limbs of the bow. Because the power cable is flexible, the lines of force necessarily are parallel to each free segment of the power cable. 
     If left in a straight path from one pulley member to the other, the power cable would interfere with movement of the arrow in the shooting plane of the bow (i.e., a plane defined by movement of the draw cable as the bow is drawn and then shot). A so-called cable guard can be employed to deflect the power cable laterally out of the shooting plane; if there are two power cables, both can be deflected in the same direction by a single cable guard, or the two power cables can be deflected in opposite directions, each by its own corresponding cable guard. However, lateral deflection of a power cable out of the shooting plane also causes the lines of force applied by that power cable to be misaligned with respect to the shooting plane. Such an arrangement can produce undesirable lateral deflection or twisting of the pulley members or the limbs, in turn leading potentially to shooting inaccuracy, poor arrow flight, accelerated wear or damage, or other problems. 
     It would be desirable to provide a compound archery bow having adjustable position or alignment of a power cable, to enable at least partial compensation for the misalignments described above or for other sources of inaccuracy or misalignment in a compound archery bow or during its use. 
     SUMMARY 
     An inventive compound archery bow comprises a substantially rigid riser, first and second resilient bow limbs, first and second pulley members, a draw cable, a power cable, a transverse coupling member, and a pair of flexible secondary power cables. The first bow limb extends from a first end portion of the riser; the second bow limb extends from a second end portion of the riser. The first pulley member is mounted on and rotatable relative to the first bow limb around a first transverse rotation axis, and includes a first draw cable groove and a power cable take-up mechanism. The second pulley member is mounted on and rotatable relative to the second bow limb around a second transverse rotation axis, and includes a second draw cable groove. The draw cable is engaged with the first and second draw cable grooves and arranged to rotate the first and second pulley members as the bow is drawn and the draw cable is let out from the first and second draw cable grooves. The power cable is engaged to be taken up by the power cable take-up mechanism of the first pulley member as the bow is drawn and the first pulley member rotates, and is coupled to the bow so as to cause deformation of one or both bow limbs as the power cable is taken up. The transverse coupling member is connected to the bow by the pair of transversely spaced-apart flexible secondary power cables; the power cable is connected to the transverse coupling member at any one of multiple cable positions along the transverse coupling member between the secondary power cables; the coupling member and the secondary power cables are arranged so as to couple the power cable to the bow. 
     A method for rigging the inventive compound archery bow comprises: (A) engaging the draw cable with the first and second draw cable grooves so that the first and second pulley members rotate and let out the draw cable as the bow is drawn; (B) connecting the transverse coupling member to the bow with the pair of secondary power cables, and connecting the power cable to the transverse coupling member at a selected one of the multiple cable positions along the transverse coupling member; and (C) engaging the power cable with the power cable take-up mechanism so that the power cable is taken up as the first pulley member rotates as the bow is drawn, thereby causing deformation of one or both bow limbs. The bow can be adjusted by moving the power cable from a first one of the multiple cable positions along the transverse coupling member to a different, second one of the multiple cable positions along the transverse coupling member. 
     Objects and advantages pertaining to compound archery bows may become apparent upon referring to the example embodiments illustrated in the drawings and disclosed in the following written description or appended claims. 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a first example of a compound archery bow. 
         FIG. 2  illustrates a second example of a compound archery bow. 
         FIG. 3  illustrates an example of a pulley assembly and a threaded axle mounted between spaced-apart end portions of a bow limb. 
         FIGS. 4A through 4H  illustrate schematically different example arrangements of a bore through the end portion of a bow limb. 
         FIG. 5  illustrates schematically an example arrangement of retaining members engaging a threaded axle and a bow limb end portion. 
         FIG. 6  illustrates schematically an example arrangement of retaining members engaging a non-threaded axle and a bow limb end portion. 
         FIGS. 7A through 7F  illustrate schematically examples of retaining members arranged to engage an axle or a coupling member, or power cable anchors arranged to engage a coupling member. 
         FIG. 8  illustrates schematically an example arrangement of retaining members engaging a threaded axle and a pulley member. 
         FIG. 9  illustrates schematically an example arrangement of retaining members engaging a non-threaded axle and a pulley member. 
         FIG. 10  illustrates schematically an example of a coupling member, a power cable anchor, and a pair of secondary power cables coupling a power cable to a bow. 
         FIGS. 11 and 12  are enlarged views of the coupling member and power cable anchor of  FIG. 10 . 
         FIG. 13  illustrates schematically an example arrangement of retaining members engaging a threaded coupling member and a power cable anchor. 
         FIG. 14  illustrates schematically an example arrangement of retaining members engaging a non-threaded coupling member and a power cable anchor. 
         FIG. 15  illustrates schematically another example of a threaded coupling member and a power cable anchor. 
     
    
    
     The embodiments depicted are shown only schematically: all features may not be shown in full detail or in proper proportion, certain features or structures may be exaggerated relative to others for clarity, and the drawings should not be regarded as being to scale. The embodiments shown are only examples: they should not be construed as limiting the scope of the present disclosure or appended claims. 
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Typically a compound archery bow  10  includes a substantially rigid central riser  11 , a pair of resilient bow limbs  12  extending from corresponding end portions of the riser  11 , corresponding pulley members  100  rotatably mounted on the bow limbs  12 , a draw cable  30 , and one (in a single- or hybrid-cam bow) or two (in a dual-cam bow) power cables  35 . The examples of inventive arrangements that are shown in the drawings are implemented on dual-cam bows employing a Binary Cam System®, with two power cables  35  and pulley assemblies  100  that typically are identical (as in  FIG. 1 ) or mirror images of each other (as in  FIG. 2 ). The inventive arrangements disclosed herein also can be employed with single- and hybrid-cam compound bows, in which only a single power cable  35  is employed, the pulley assemblies  100  differ from each other, and one or more additional cables are employed. The following descriptions of inventive arrangements of a pulley assembly  100  or a power cable  35  shall apply to any of a single pulley assembly  100  or a single power cable  35  of a single- or hybrid-cam bow, or to both pulley assemblies  100  or both power cables  35  of a dual-cam compound bow. 
     The draw cable  30  is engaged with draw cable grooves  102  of the pulley members  100  and are let out from the draw cable grooves  102  as the bow  10  is drawn and the pulley members  100  rotate. The power cable  35  is engaged at a first end to be taken up by a power cable take-up mechanism on the pulley member  100  as the bow  10  is drawn and the pulley member  100  rotates. Typically the power cable take-up mechanism comprises a non-circular or eccentrically mounted pulley with a peripheral power cable groove  104 ; other arrangements can be employed (e.g., a set of one or more eccentrically mounted anchors or posts, or an additional power cable groove). The second end of the power cable  35  is coupled to the bow, usually to the other limb  12 , to the other pulley member  100  (e.g., let out from the groove  106  as in  FIG. 1 , or taken up then let out by the eccentrically mounted anchor  108  as in  FIG. 2 ), or to an axle on which the other pulley member  100  is mounted; or in some cases the second end of the power cable  35  is coupled to the riser  11  or to a stock of a crossbow. In some examples (e.g., as in U.S. Pat. Nos. 7,350,979 and 7,770,568 incorporated above, and in the examples shown, all of which employ a Binary Cam System®) the second end of the power cable  35  is let-out by the other pulley member  100  over at least a latter portion of drawing the bow (as in  FIGS. 1 and 2 ); in some examples (e.g., U.S. Pat. No. 8,181,638 incorporated above) the second end of the power cable also can be taken up during an initial portion of drawing the bow (as in  FIG. 2 ). As the bow  10  is drawn and the pulley members  100  rotate, the draw cable  30  is let out from draw cable grooves  102  of both pulley members  100 . Take-up of the power cable  35  by the power-cable take-up mechanism of the pulley member  100  (into the power-cable groove  104  in the examples shown) causes deformation of the bow limbs  12 , usually by pulling them toward one another, which in turn results in storage of energy by the bow  10 . That stored energy is released when the bow  10  is shot and the bow limbs  12  return to their initial shapes (i.e., their shapes at brace). Consequently, the power cable  35  is under considerable tension when the bow  10  is drawn, and that tension produces forces and torques on the pulley members  100  and limbs  12  of the bow. Because the power cable  35  is flexible, the lines of force necessarily are aligned along each free segment of the power cable. 
     If left in a straight path from one pulley member  100  to the other, the power cable  35  would interfere with movement of the arrow in the shooting plane of the bow  10  (i.e., a plane defined by movement of the draw cable  30  as the bow is drawn and then shot). A so-called cable guard  15  can be employed to deflect the power cable  35  laterally out of the shooting plane; if there are two power cables  35 , both can be deflected in the same direction by a single cable guard  15  (e.g., as in  FIG. 2 ), or the two power cables  35  can be deflected in opposite directions, each by its own corresponding cable guard  15  (e.g., as in  FIG. 1 ). However, lateral deflection of a power cable  35  out of the shooting plane also causes the lines of force applied by that power cable to be misaligned with respect to the shooting plane. Such an arrangement can produce undesirable lateral deflection or twisting of the pulley members  100  or the limbs  12  on which they are mounted, in turn leading potentially to shooting inaccuracy, poor arrow flight, accelerated wear of or damage to the bow&#39;s components, or other problems. 
     It would be desirable to provide a compound archery bow having adjustable position or alignment of a power cable, to enable at least partial compensation for the misalignments described above or for other sources of inaccuracy or misalignment in a compound archery bow or during its use. 
     In some inventive embodiments of a compound bow, the pulley member  100  can be fixed at any one of multiple transverse positions along its rotation axis relative to the bow limb  12 , between spaced-apart end portions  123  of the bow limb  12 . Altering the transverse position of the pulley member  100  relative to the bow limb  12  alters the position and alignment of the draw cable  30  and the power cable  35  engaged with the pulley member  100 . The transverse position of the pulley member  100  can be optimized with respect to any desired parameter that characterizes behavior of the bow. In one example, a user can fire arrows at a target with the pulley member  100  at different transverse positons, and choose the position that appears to yield the most accurate arrow flight, the smallest grouping of arrows on a target, or a single, small hole through a paper sheet at close range; other suitable optimizations can be employed. The multiple transverse positions can be a set of discrete transverse positions, or a continuously variable range of transverse positions. The spaced-apart portions of the bow limb can comprise a pair of forked end portions  123  of a single bow limb  12  (as in the examples shown in the drawings), or the split-limb portions of a split-limb bow limb (i.e., a two-piece bow limb; not shown). Multiple transverse positions of the pulley member  100  can be employed in a compound bow  10  that is arranged as a dual-cam, single-cam, or hybrid-cam compound bow. In any of those bows types, one or both pulley assemblies  100  can be movable among multiple transverse positions. In some examples, movement of the pulley member  100  among the multiple transverse positions can be effected by the transverse axle  150  being retained on the bow limb  12  at any one of multiple axle positions along the its rotation axis by engagement of the transverse axle  150  with the bow limb  12 . In some examples, movement of the pulley member  100  among the multiple transverse positions can be effected by the pulley member  100  being retained on the corresponding transverse axle  150  at any one of multiple pulley positions along the transverse axle by engagement of the pulley member  100  with the transverse axle  150 . Either of those inventive arrangements (i.e., multiple axle positions on bow limb, or multiple pulley positions along axle), or both together, can be employed as needed or desired in a given compound archery bow. 
     In some embodiments, the transverse axle  150  is retained, in a pair of coaxial bores  124  through the spaced-apart portions  123  of the bow limb  12 , at any one of the multiple axle positions along the rotation axis of the pulley member  100 . Engagement of the transverse axle  150  with the bow limb  12  holds the axle at a selected transverse position. The bores  124  through the end portions  123  of the limb  12  can be formed in any suitable way. Examples are illustrated schematically in the drawings and can include a bore  124  directly through the limb end portion  123  (e.g., as in  FIGS. 4A, 4B, 4F, 4G, and 4H ), a bore  124  through a pillow block  125  that is in turn secured to the limb end portion  123  (e.g., as in  FIG. 4C ), or a two-piece bore  124  with a clamping member  126  forming a portion of the circumference of the bore  124  and secured to the limb end portion  123  (e.g., as in  FIG. 4D ) or to a pillow block  125  (e.g., as in  FIG. 4E ) that forms the rest of the circumference of the bore  124 , with the shaft  150  held between them. Any of those bore arrangements can be implemented in any of the disclosed examples of compound bows. For purposes of the present disclosure and appended claims, any recitation of a bore through an end portion of a bow limb shall encompass all of those arrangements unless explicitly limited to fewer than all of them. 
     In some embodiments (e.g., the example shown in  FIG. 3 ), at least one lateral portion of the transverse axle  150  is externally threaded, and the corresponding coaxial bore  124  is internally threaded. Typically both lateral portions and both bores  124  are threaded to provide more robust engagement of the axle  150  with the bow limb  12 ; that arrangement is described below, but those descriptions also apply to arrangements that include only a single threaded lateral portion of the axle  150  engaged with a single threaded bore  124  on the bow limb  12 . Engagement of the transverse axle  150  with the bow limb  12  is effected by threaded engagement of each threaded lateral portion of the transverse axle  150  in a corresponding threaded bore  124  of the bow limb  12 . Movement of the transverse axle  150  along the first rotation axis, relative to the bow limb  12 , is effected by rotation of the transverse axle  150  threadedly engaged in the threaded bores  124 . A substantially continuous range of transverse axle positions can be realized in this threaded arrangement. One or both ends of the transverse axle  150  has a socket, hex, slot, Phillips, or other suitable screw drive to enable adjustment of the transverse position of the axle  150  relative to the limb  12 . 
     Once the transverse axle  150  is moved to a selected transverse axle position, a variety of arrangements can be employed, on one or both bow limb end portions  123 , to reduce or eliminate unwanted further transverse movement of the axle. In the example of  FIG. 4A , a set screw in threaded hole  123   a  into the bore  124  is employed to retain the axle  150  at the selected position; a similar arrangement can be employed in the example of  FIG. 4C . In the example of  FIG. 4B , one or both end portions  123  of the bow limb  12  are arranged to act a clamp tightened using a screw through the clearance hole  123   b  and threaded into hole  123   c ; the pillow block  125  in the example arrangement of  FIG. 4C  could be similarly arranged as a clamp. Each one of the examples of  FIGS. 4D and 4E  can be secured with a set screw (as in  FIG. 4A ), or can be arranged as a clamp by leaving a small clearance between the clamping member  126  and the limb end portion  123  (as in  FIG. 4D ) or the pillow block  125  (as in  FIG. 4E ) and tightening the clamping member  126  onto the axle  150  at the selected axle position. 
     In the example of  FIG. 4F , a resilient plug, pellet, or longitudinal strip  123   d  is disposed within the bore  124  (secured to either the bore  124  or to the transverse axle  150 ); in the example of  FIG. 4G , a resilient coating is bonded to threads (of either the bore  124  or the transverse axle  150 ) around only a portion of the circumference of the threads; in the example of  FIG. 4H , a resilient circumferential threaded insert  123   f  is secured within the bore  124 . A common material for the resilient members  123   d / 123   e / 123   f  is nylon; other suitable one or more resilient materials (i.e., elastically deformable materials) can be employed. In the examples of  FIGS. 4F and 4G , compression of the resilient member  123   d / 123   e  (i.e., the plug, pellet, strip, or coating), upon threaded engagement of the axle  150  in the bore  124 , urges the respective threads against each other on the opposite side of the bore/axle; in the example of  FIG. 4H , the threaded insert is slightly undersized resulting in an interference fit of the threadedly engaged axle  150 . In each of these example arrangements ( FIGS. 4F through 4H ), the resulting increased friction between the respective threads of the bore  124  and axle  150  retains the transverse axle  150  at the selected position, unless sufficiently large torque is applied by a user using the screw drive (i.e., unless the so-called prevailing torque of the engaged threads is exceeded). 
     Instead of, or in addition to, threaded engagement of the axle  150  in the bores  124 , one or more separate retaining members  129  can be employed to retain the threaded axle  150  at the selected transverse position relative to the bow limb  12  (e.g., as in  FIG. 5 ). In one example, the retaining members  129  can be internally threaded and threadedly engaged on the threaded portions of the axle  150  on one or both sides of one or both of the bow limb end portions  123 . A retaining member  129  tightened against the bow limb end portion  123  can act as a lock nut or jam nut and hold the axle  150  in place. One such threaded retaining member  129  on the axle  150  might be sufficient; two, three, or four threaded retaining members can provide more robust engagement of the axle  150  with the bow limb  12 . In the examples of  FIG. 7D through 7F , a resilient plug, pellet, or longitudinal strip  129   d , a resilient coating  129   e , or a resilient circumferential threaded insert  129   f , respectively, is disposed within the threaded central passage of the retaining member  129 . The resulting frictional engagement retains the retaining member  129  in place (as discussed above for the axle  150  threadedly engaged in the bore  124 ). With or without internal threads, one or more retaining members  129  can be held in place by set screws in corresponding threaded holes  129   a  (e.g., arranged as in  FIG. 7A ), or be arranged as one-piece or two-piece clamps secured with screws inserted through corresponding clearance holes  129   b  and threaded into corresponding threaded holes  129   c  (e.g., arranged as in  FIG. 7B or 7C , respectively), and act as retaining flanges on the axle  150 . At least two such retaining members  129  are needed to retain the axle  150  at the selected position; three or four such retaining members  129  can provide more robust engagement of the axle  150  with the bow limb  12 . 
     In some embodiments, one or both lateral portions of the axle  150  are threaded, but the bores  124  need not be threaded. Two or more threaded retaining flanges  129  can be employed (e.g., arranged as in  FIG. 5 ) to engage one or both end portions  123  of the bow limb  12  to retain the axle  150  at a selected transverse axle position. Rotation of the threaded retaining flanges  129  along the threaded lateral portion also effects transverse movement of the axle  150  along its axis. A substantially continuous range of transverse axle positions can be realized in this threaded arrangement. Two threaded retaining members are sufficient to retain the axle  150  at a selected transverse position; three of four such retaining members can provide more robust engagement of the axle  150  with the bow limb  12 . The threaded retaining flanges can be arranged according to any of  FIGS. 7A through 7F . 
     In some embodiments, neither the axle  150  nor the bores  124  need to be threaded (e.g., arranged as in  FIG. 6 ). In one such arrangement, one or both bow limb end portions  123 , pillow blocks  125 , or clamping members  126  can include a hole  123   a  for a set screw (e.g., as in  FIG. 4A, 4C, 4D , or  4 E) or can be arranged as a clamp (e.g., arranged as in  FIG. 4B, 4D , or  4 F) to retain the axle  150  at a selected transverse axle position. In another such arrangement, two or more retaining members  129  can be held in place by set screws in corresponding threaded holes  129   a  (e.g., as in  FIG. 7A ), or be arranged as one-piece or two-piece clamps (e.g., as in  FIG. 7B or 7C ), and act as retaining flanges on the axle  150 . At least two such retaining members  129  are needed to retain the axle  150  at the selected position; three or four such retaining members  129  can provide more robust engagement of the axle  150  with the bow limb  12 . In any of these non-threaded arrangements, the axle  150  can be moved to a selected transverse position (e.g., simply by pushing or pulling) and the set screw engaged, the clamp tightened, or the retaining flanges  129  moved into place and secured, to engage the axle  150  and the bow limb  12  to retain the axle  150  at the selected transverse axle position. These non-threaded arrangements can provide a substantially continuous range of transverse axle positions; alternatively, the axle  150  or the retaining flanges  129  can be arranged to enable attachment of the retaining members  129  to the axle  150  at only discrete positions along the axle, e.g., using a set of slots, grooves, or depressions arranged along the axle  150  that engage a set screw or a mating structure of the retaining flanges  129 . In one such example, at least one or both lateral portions of the shaft  150  can include a set of circumferential grooves, and two or more snap rings can be employed as the retaining flanges  129 . 
     In embodiments in which there is threaded engagement of the axle  150  with the bow limb  12  or retention of the axle  150  by tightening of a threaded retaining member  129  against the bow limb  12 , rotation of the axle  150  relative to the bow limb  12  is undesirable. Such rotation would cause transverse movement of the axle  150  in the former or loosening of the retaining members  129  in the latter. In such embodiments, the pulley member  100  is rotatably mounted on the axle  150 , so that the pulley member  100  can rotate independently of the axle  150  when the bow is drawn and shot. A bearing of any suitable type or arrangement can be employed for enabling rotation of the pulley member  100  about the axle  150 , if needed or desired. Any suitable arrangement can be employed for substantially preventing movement of the pulley member  100  along the axle  150  while permitting rotation of the pulley member  100  about the axle  150  (including some of those described further below). In the example of  FIG. 3 , a pair of snap rings engaged in grooves around the axle act as retaining members  159 . In embodiments lacking threaded engagement of the axle  150  with the bow limb  12  and lacking retention of the axle  150  by tightening of a threaded retaining member  129  against the bow limb  12 , the axle  150  can rotate relative to the bow limb  12 , the pulley member  100  can rotate relative to the axle  150 , or both. If the axle  150  rotates relative to the bow limb  12 , a bearing of any suitable type or arrangement can be employed, if needed or desired. 
     Instead of, or in addition to, the inventive arrangements described above (in which the axle  150  can be secured to the bow limb  12  at one of multiple transverse axle positions), in some embodiments, the pulley member  100  is retained on the transverse axle  150  at any one of the multiple pulley positions along the transverse axle  150 . Retention of the pulley member  100  at a selected one of the multiple positions along the axle  150  is effected by engagement of the pulley member with the transverse axle. That inventive arrangement is in contrast with some conventional arrangements in which (i) washers, spacers, or shims of various number or thicknesses are interposed between the pulley member and the end portions of the bow limb to constrain the position of the pulley member on the axle, and (ii) there is no direct engagement between the pulley member and axle that acts to hold the pulley member at the selected position on the axle. 
     In some embodiments, a central portion of the axle  150  is externally threaded, and a central bore through the pulley member  100  is internally threaded. Threaded engagement of the pulley member  100  with the axle  150  retains the pulley member at a selected one of multiple pulley positions along the axle  150 , and can provide a substantially continuous range of multiple pulley positions along the axle. Relative rotation of the threadedly engaged axle  150  and pulley member  100  effects movement of the pulley member  100  among the multiple pulley member positions along the axle  150 . In some examples, a resilient member (e.g., a pellet, plug, strip, coating, or threaded insert) can be disposed within the central bore of the pulley member  100  and the threads of the axle  150  (as described above for the axle  105  threadedly engages within bores  124 ). More typically, one or more retaining members  159 , such as any of those described above, can be employed to retain the pulley member  100  at a selected one of multiple pulley positions along the transverse axle  150  (e.g., arranged as in  FIG. 8 ). In some examples, a threaded retaining member  159  threadedly engaged with the axle  150  and tightened against the pulley member  100  and can act as a lock nut or jam nut and hold the pulley member  100  in place. One such threaded retaining member  159  on the axle  150  might be sufficient; two threaded retaining members can provide more robust engagement of the pulley member  100  with the axle  150 . Instead of internal threads, in some other examples a pair or retaining members  159  can be held in place by set screws (e.g., as in  FIG. 7A ), can be arranged as one-piece or two-piece clamps (e.g., as in  FIG. 7B or 7C , respectively), or can include a resilient member (e.g., as in  FIGS. 7D through 7F ), and act as retaining flanges on the axle  150  on opposite sides of the pulley member  100 . 
     In some embodiments, the central portion of the axle  150  is threaded, but the central bore of the pulley member  100  need not be threaded. Two threaded retaining flanges  159  can be employed (e.g., arranged as in  FIG. 8 ) to engage both sides of the pulley member  100  between them and retain the pulley member  100  at the selected pulley position along the axle  150 . Rotation of the threaded retaining members  159  along the threaded central portion  151  also effects transverse movement of the pulley member  100  along the axle  150 . A substantially continuous range of pulley positions along the axle can be realized in this threaded arrangement. The threaded retaining flanges  159  can be retained at the desired positions using any of the arrangements shown in  FIGS. 7A through 7F . 
     In some embodiments, neither the axle  150  nor a central bore through the pulley member  100  need to be threaded, but can be retained by a pair of retaining flanges  159  (e.g., arranged as in  FIG. 9 ). In one such arrangement, two retaining flanges  159  on opposite sides of the pulley member  100  can be held in place by set screws (e.g., as in  FIG. 7A ), or be arranged as one-piece or two-piece clamps (e.g., as in  FIG. 7B or 7C ), and act as retaining flanges on the axle  150 . In any of these non-threaded arrangements, the pulley member  100  can be moved to a selected pulley position along the axle  150  (e.g., simply by pushing or pulling), and the retaining members  159  can be moved into place against the pulley member  100  and secured, to engage the pulley member  100  with the axle  150  to retain the pulley member  100  at the selected pulley position. These non-threaded arrangements can provide a substantially continuous range of transverse axle positions; alternatively, the axle  150  or the retaining members  159  can be arranged to enable attachment of the retaining members  159  to the axle  150  at only discrete positions along the axle, e.g., using a set of slots, grooves, or depressions arranged along the axle  150  that engage a set screw or a mating structure of the retaining member  159 . In one such example, the central portion of the shaft  150  can include a set of circumferential grooves, and two snap rings can be employed as the retaining members  159 . Any of the above arrangements can also be used to retain the pulley member  100  on the axle  150  in a single pulley position, in some of the embodiments described earlier in which the axle is moveable among multiple axle positions. 
     In embodiments in which there is threaded engagement of the pulley member  100  with the axle  150  or retention of the pulley member  100  by tightening of a threaded retaining member  159  against the pulley member  100 , rotation of the pulley member  100  relative to the axle  150  is undesirable. Such rotation would cause transverse movement of the pulley member  100  in the former or loosening of the threaded retaining members  159  in the latter. In such embodiments, the axle  150  is rotatably mounted on the bow limb  12 , so that the pulley member  100  and the axle  150  can rotate together when the bow is drawn and shot. Any suitable arrangement can be employed for substantially preventing transverse movement of the axle  150  along its rotation axis while permitting rotation of the axle  150  relative to the bow limb  12  (including some of those described above). A bearing can be employed of any suitable type or arrangement. In embodiments lacking threaded engagement of the pulley member  100  with the axle  150  and lacking retention of the pulley member  100  by tightening of a threaded retaining member  159  against the pulley member  100 , the axle  150  can rotate relative to the bow limb  12 , the pulley member  100  can rotate relative to the axle  150 , or both. One or more bearings of any suitable type or arrangement can be employed. 
     The example embodiments described above can be employed for one or both pulley assemblies of a compound archery bow of any type (e.g., dual-cam, single-cam, or hybrid-cam). For a dual-cam bow, typically both pulley assemblies are moveable among multiple transverse positions along their respective rotation axes. In single-cam or hybrid-cam bows, typically at least the pulley member that takes up the single power cable is moveable among multiple transverse positions along its rotation axis. If the power cable is taken up or let out by the other pulley member, typically that other pulley member is moveable among multiple transverse positions along its rotations axis as well. 
     A method for rigging any of the example embodiments of a compound bow  10  comprises: (A) fixing the pulley member  100  at a selected one of the multiple transverse positions along its rotations axis; (B) engaging the draw cable  30  with the draw cable grooves  102  so that the pulley members  100  rotate and let out the draw cable  30  as the bow  10  is drawn; and (C) coupling the power cable  30  to the bow  10  and engaging the power cable  30  with the power cable take-up mechanism  104  so that the power cable  30  is taken up as the corresponding pulley member  100  rotates as the bow  10  is drawn, which causes deformation of the bow limbs  12 . To adjust the bow  10 , one (or both) pulley members  100  can be moved from one transverse position along its rotation axis to a different transverse position. 
     Adjustment of the bow  10  by transverse movement of one or both pulley members  100  can be guided or optimized by any suitable or desired performance parameter or characteristic of the bow. Commonly, a transverse position of a pulley member  100  (or transverse positions of both pulley members  100  in some cases) is selected that results in improved or optimized aiming or alignment properties of the bow  10 , e.g., based on the size of a grouping of arrows shot at a target, deviation of the arrow flight from a sighted target point, or so-called paper tuning (wherein an arrow is shot through a sheet of paper an close range: a single small hole indicates proper tuning, a vertical tear can be at least partly corrected by movement of the nock point on the bowstring, and a horizontal tear can be at least partly corrected by adjustment of one or more of the inventive arrangements disclosed herein). 
     The inventive embodiments described above enable the position or alignment of one or both power cables  35  at the end that is taken up when the bow is drawn. Instead, or in addition, the other, second end of the power cable can be arranged so as to enable alteration of the position or alignment of the power cable. The second end of a power cable  35  is coupled to the bow  10 , usually to the other limb  12 , to the other pulley member  100 , or to an axle  150  on which the other pulley member is mounted; in some cases the second end of the power cable  35  is coupled to the riser  11  or to a stock of a crossbow. Wherever the second end of the power cable  35  is coupled to the bow  10 , the inventive arrangements described below enable alteration of the position or alignment of the power cable  35 . As noted above, the following description can apply to a single power cable  35  of a single-cam or hybrid-cam compound bow, or can apply to one or both power cables  35  of a dual-cam compound bow. 
     Some inventive embodiments of a compound bow  10  (e.g., the example embodiment of  FIG. 2 ) include a transverse coupling member  302  and a pair of secondary power cables  350  (e.g., as in  FIGS. 10 through 12 ). The transverse coupling member  302  is connected to the bow  10  by the pair of transversely spaced-apart secondary power cables  350 . The power cable  35  is arranged to be taken up by a first pulley member  100  on a first bow limb  12  as the bow  10  is drawn. The other end of the power cable  35  is connected to the transverse coupling member  302  in any one of multiple cable positions along the transverse coupling member  302  between the secondary power cables  350 . The coupling member  302  and the secondary power cables  350  are arranged so as to couple the power cable  35  to the bow  10 . Typically, the two secondary power cables  350  are connected to the bow  10  at the second bow limb  12 , the second pulley member  100 , or the transverse axle  150  on which the second pulley member  100  rotates. As noted above, in some examples the secondary power cables  350  are connected to the riser  11  or to the stock of a crossbow. By moving the attachment point of the power cable  35  among the multiple cable positions on the transverse coupling member  302 , the position or alignment of the power cable  35  can be altered. As described above for movement of the pulley member  100  along its rotation axis, adjustment of the position of the power cable  35  on the coupling member  302  can be guided or optimized by any suitable or desired performance parameter or characteristic of the bow, such as improved or optimized aiming or alignment properties of the bow  10 . 
     In some embodiments (e.g., as in  FIGS. 10 through 13 ), at least a central portion of the transverse coupling member  302  includes external threads. A power cable anchor  310  is engaged with the coupling member  302 , and the power cable  35  is connected to the power cable anchor  310 . In some examples the power cable anchor  310  includes a central bore and the transverse coupling member  302  passes through the bore; in some examples the power cable anchor can be arranged as in any of  FIGS. 7A through 7F ; in some examples the cable anchor  310  only partly encircles the coupling member  302 , or engages only a portion of the circumference of the coupling member  302 . The engagement of the power cable anchor  310  with the coupling member  302  and can be achieved in a variety of ways. 
     In some examples (e.g., as in  FIGS. 10 through 13 and 15 ), the power cable anchor  310  is internally threaded and engages the threads of the transverse coupling member  302 . In some examples, e.g., the example of  FIGS. 11 and 12 , the power cable anchor  310  threadedly engages only a portion of the circumference of the threaded coupling member  302 ; in other examples, e.g., the example of  FIGS. 13 and 15 , the threaded engagement can entirely encircle the coupling member  302 . In threadedly engaged arrangements, movement of the power cable anchor  310  along the transverse coupling member  302  is effected by relative rotation of the threadedly engaged transverse coupling member  302  and power cable anchor  310 , thereby altering the cable position where the power cable  35  is connected to the transverse coupling member  302 . A substantially continuous range of cable positions along the transverse coupling member  302  can be provided in arrangements that include a threaded coupling member  302  and a threaded power cable anchor  310 . One or both ends of the coupling member  302  has a socket, hex, slot, Phillips, or other suitable screw drive, or a knob or wingnut-like arrangement, to enable adjustment of the transverse position of the power cable anchor  310  relative to the coupling member  302 . Because drawing and shooting the bow  10  does not require relative rotation of the coupling member  302  and the cable anchor  310 , their threaded engagement and tension in the power cable  35  often can be sufficient to retain the cable anchor  310  at the selected cable position. In examples wherein the threaded power cable anchor  310  is arranged as in  FIG. 7A , a set screw can be employed to retain the power cable anchor  310  at the selected power cable position along the coupling member  302 ; in examples wherein the threaded power cable anchor  310  is arranged as in  FIG. 7B or 7C , the power cable anchor  310  can be clamped onto the retaining member  302  at the selected power cable position. In examples wherein the threaded power cable anchor  310  is arranged as in  FIGS. 7D through 7F , a resilient member in the threaded central bore of the power cable anchor  310  against the threads of the coupling member  302  can effect frictional engagement, as described above. 
     In some examples (e.g., as in  FIG. 13 ), one or more internally threaded retaining members  319  are threadedly engaged on the threaded transverse coupling member  302 , and engagement of the power cable anchor  310  with the transverse coupling member  302  is effected by tightening the one or more threaded retaining members  319  against the power cable anchor  310  (only one threaded retaining member  319  acting as a jam nut sufficient if the cable anchor  310  is threaded; two threaded retaining members  319  needed on opposite sides of the cable anchor  310  if it is not threaded). If the power cable anchor  310  is not threaded, movement of the power cable anchor  310  among the multiple cable positions along the transverse coupling member  302  is effected by relative rotation of the transverse coupling member  302  and the threaded retaining members  319  threadedly engaged on the transverse coupling member  302 , thereby altering the cable position where the power cable  35  is connected to the transverse coupling member  302 . A substantially continuous range of cable positions along the transverse coupling member  302  can be provided in arrangements that include threads  303  on the coupling member  302 . Threaded retaining member  319  can be arranged as shown on any of  FIGS. 7A through 7F . 
     Instead of external threads, the transverse coupling member  302  can include a set of multiple circumferential grooves or ridges arranged along at least its central portion. Each one of the multiple grooves or ridges defines a corresponding one of a set of multiple discrete cable positions along the transverse coupling member  302 ; the power cable  35  can be moved by engaging the power cable anchor  310  with a different one of the grooves or ridges. In some examples engagement of the power cable anchor  310  with one or the slots or ridges, and tension on the power cable  35 , can retain the power cable anchor  310  at the corresponding cable position along the coupling member  302 ; in some examples the power cable anchor can be arranged as in any one of  FIGS. 7A through 7C  for retention at a selected power cable position along the coupling member  302 . 
     In embodiments including threads, grooves, or ridges, instead of employing a cable anchor  310 , the power cable  35  can be connected to the transverse coupling member  302  directly, by being looped around the coupling member  302  in one of the threads, in one of the grooves, or between any pair of adjacent ridges. If threads are employed, movement of the power cable  35  to a different power cable position can be effected by rotation of the transverse coupling member  302 . Wear caused by that rotation typically is not a concern, because adjustments would be expected to be small and infrequent. If grooves or ridges are employed, the looped power cable  35  is simply moved to a different groove or between a different pair of ridges. 
     In some examples the transverse coupling member  302  has neither threads nor grooves. The power cable anchor  310  is positioned on a central portion of the transverse coupling member  302  at any one of the multiple cable positions. In some examples the power cable anchor  310  can be held in place by a set screw, or by being arranged as a one or two-piece clamp (e.g., as in any one of  FIGS. 7A through 7C ). In some examples, the power cable anchor can be held in place on the coupling member  302  between a pair of retaining members  319  (e.g., as in any one of  FIGS. 7A through 7C ) on the transverse coupling member  302 . Any of those arrangements provide a substantially continuous range of cable positions along the coupling member  302 . 
     In some examples, the power cable  35  is connected to the power cable anchor  310  by being looped around the power cable anchor  310  in a peripheral groove  312  thereof (e.g., as in  FIGS. 10 through 12 ). Other suitable arrangements can be employed for connecting the power cable  35  to the power cable anchor  310  (e.g., a ferrule). In some examples, the pair of secondary power cables  350  is connected to the transverse coupling member  302  by being looped around the coupling member  302  in corresponding lateral grooves  311  thereof (e.g., as in  FIGS. 10 through 12 ). In some examples, a secondary cable anchor can be employed for each of the secondary power cables  350 ; such cable anchors can be arranged in a manner similar to any of the arrangements of the cable anchor  310  described above on threaded or non-threaded lateral portions of the coupling member  302 . Other suitable arrangements can be employed for connecting the secondary power cables  350  to the transverse coupling member  302  (e.g., a ferrule). 
     In some examples the secondary power cables  350  can be connected to the second bow limb  12  using posts, anchors, ferrules, or other connections of any suitable type or arrangement. In some examples the secondary power cables can be connected to the second axle  150  (between the end portions  123  of the bow limb  12 , or with the end portions  123  between the secondary power cables  350 ). In some examples the secondary power cables  350  can be looped around the axle  150 , which can be provided with corresponding anchors, grooves, or ridges for receiving the secondary power cables  350 . Cable anchors similar in type and arrangement to any of those described above can be employed if needed or desired. 
     In some examples (including dual-cam bows that employ a Binary Cam System®), the secondary power cables  350  are connected to the second pulley member  100 , which is arranged so as to let out the secondary power cables  350  over a latter portion of drawing the bow  10 . In addition, in some examples the second pulley member  100  can be arranged so as also to take up the secondary power cables  350  over an initial portion of drawing the bow  10  (e.g., as disclosed in U.S. Pat. No. 8,181,638 incorporated above). In some of those examples, the second pulley member  100  can include paired let-out members disposed on opposite sides of the second bow limb  12 ; each one of the pair of secondary power cables  350  is connected to a corresponding one of the paired let-out members. In some instances the paired let-out members comprise a pair of power cable anchors  108  that are eccentrically positioned relative to the second rotation axis defines by the second axle  150  (e.g., as in  FIGS. 2 and 10 ). 
     In some examples the lengths of the secondary power cables  350  are the same as one another, while in other examples those lengths differ from each other. In some examples, the pair of secondary power cables  350  is arranged so as to enable adjustment of relative lengths of the secondary power cables  350  of the pair. A method for such a bow comprises altering the relative lengths of the secondary power cables  350  of the pair. That adjustment can be guided or optimized by any suitable or desired performance parameter or characteristic of the bow, such as improved or optimized aiming or alignment properties of the bow  10  (e.g., based on the size of a grouping of arrows shot at a target, or deviation of the arrow flight from a sighted target point, or paper tuning). 
     In some examples the effective attachment point of the power cable  35  is displaced from a transverse axis defined by the coupling member  302 . In the example shown in  FIG. 15 , the cable anchor  310  is elongated so that portions of its circumferential groove extend away from the transverse coupling member  302 . The threaded central bore of the cable anchor  310  engages the entire circumference of the threaded transverse coupling member  302 , thereby limiting or preventing lateral angular motion (i.e., tilting) of the cable anchor  310  relative to the transverse coupling member  302 . That rigid displacement of the anchor point for the power cable  350  from the axis of the transverse coupling member cab reduce twisting of the bow limb  12  caused by the power cable  35  being deflected laterally relative to the shooting plane. If the power cable  35  and the secondary power cables  350  formed a conventional split-cable arrangement (i.e., without the coupling member  302  and cable anchor  310 ), then any lateral deflection of the power cable  35  from the shooting plane would torque the bow limb  12 , causing it to twist. With the rigidly displaced power cable attachment provided by the cable anchor of  FIG. 15 , any lateral deflection of the power cable  35  would also tend to tilt the anchor  310  and the coupling member  302 . However, the tension on the power cable  35  would tend to oppose that tilting, resulting in less torque transmitted to the bow limb and less twisting. A displacement of the power cable attachment point from the transverse coupling member  302  between about 0.5 inches and about 2 inches, typically about 1 inch, can be advantageously employed to reduce twisting of the bow limbs as the bow is drawn and the power cable  35  is further tensioned. 
     A method for rigging any of the example embodiments of a compound bow  10  comprises: (A) engaging the draw cable  30  with the draw cable grooves  102  so that the pulley members  100  rotate and let out the draw cable  30  as the bow  10  is drawn; (B) connecting the transverse coupling member  302  to the bow  10  with the pair of secondary power cables  350 , and connecting the power cable  35  to the transverse coupling member  302  at a selected one of the multiple cable positions along its length; and (C) engaging the power cable  35  with the power cable take-up mechanism  104  so that the power cable  35  is taken up as the corresponding pulley member  100  rotates as the bow  10  is drawn, which causes deformation of one or both bow limbs  12 . To adjust the bow  10 , one (or both) power cables  35  can be moved from one cable position along the corresponding transverse coupling member  302  to a different, second cable position. 
     Adjustment of the bow  10 —by transverse movement of the power cable  35  along the transverse coupling member  302 , adjustment of the relative lengths of the secondary power cables  350 , or both of those (for a single power cable  35 , or for one or the other or both power cables  35 , if two are present)—can be guided or optimized by any suitable or desired performance parameter or characteristic of the bow. Commonly, a transverse position of a pulley member  10  is selected that results in improved or optimized aiming or alignment properties of the bow  10  (e.g., based on the size of a grouping of arrows shot at a target, or deviation of the arrow flight from a sighted target point, or paper tuning). 
     One or the other or both of the arrangements disclosed herein for positioning and aligning the power cable  35  (i.e., (i) one or both pulley members  100  movable along their respective rotation axes, or (ii) one or both power cables  35  movable along a coupling member  302  connected to the bow by a pair of secondary power cables  350 , with optional adjustment of relative lengths of the secondary power cables  350 ) can be employed for the power cable  35  of single-cam or hybrid-cam compound bow, or for one or both power cables  35  of a dual-cam compound bow. A user of a compound archery bow is thus provided with multiple adjustable parameters to tune the bow to suit a wide range of individual variations, preferences, or idiosyncrasies in shooting technique. 
     In addition to the preceding, the following examples fall within the scope of the present disclosure or appended claims: 
     Example 1 
     A compound archery bow comprising: (a) a substantially rigid riser; (b) a first resilient bow limb extending from a first end portion of the riser; (c) a second resilient bow limb extending from a second end portion of the riser; (d) a first transverse axle and a first pulley member, wherein the first transverse axle is mounted on the first bow limb so as to define a first transverse axis, the first pulley member is connected to the first transverse axle between spaced-apart end portions of the first bow limb, the first pulley member is rotatable relative to the first bow limb around the first rotation axis, and the first pulley member includes a first draw cable groove and a power cable take-up mechanism; (e) a second transverse axle and a second pulley member, wherein the second transverse axle is mounted on the second bow limb so as to define a second transverse axis, the second pulley member is connected to the second transverse axle between spaced-apart end portions of the second bow limb, the second pulley member is rotatable relative to the second bow limb around the second rotation axis, and the second pulley member includes a second draw cable groove; (f) a draw cable engaged with the first and second draw cable grooves and arranged to rotate the first and second pulley members as the bow is drawn and the draw cable is let out from the first and second draw cable grooves; and (g) a power cable (i) engaged to be taken up by the power cable take-up mechanism of the first pulley member as the bow is drawn and the first pulley member rotates and (ii) coupled to the bow so as to cause deformation of one or both bow limbs as the power cable is taken up, (h) wherein the first pulley member is fixed at any one of multiple transverse positions along the first rotation axis relative to the first bow limb by one or both of: (i) the first transverse axle being retained on the first bow limb at any one of multiple axle positions along the first rotation axis by engagement of the first transverse axle with the first bow limb, or (ii) the first pulley member being retained on the first transverse axle at any one of multiple pulley positions along the first transverse axle by engagement of the first pulley member with the first transverse axle. 
     Example 2 
     The bow of Example 1 wherein the second pulley member is fixed at any one of multiple transverse positions along the second rotation axis relative to the second bow limb by one or both of: (i) the second transverse axle being retained on the second bow limb at any one of multiple axle positions along the second rotation axis by engagement of the second transverse axle with the second bow limb, or (ii) the second pulley member being retained on the second transverse axle at any one of multiple pulley positions along the second transverse axle by engagement of the second pulley member with the second transverse axle. 
     Example 3 
     The bow of any one of Examples 1 or 2 wherein the power cable is coupled to the bow at the second bow limb, the second transverse axle, or the second pulley member. 
     Example 4 
     The bow of any one of Examples 1 through 3 wherein the first bow limb comprises a single limb, and the spaced-apart portions of the first bow limb are a pair of forked end portions of the single first bow limb. 
     Example 5 
     The bow of any one of Examples 1 through 3 wherein the first bow limb comprises a split limb, and the spaced-apart portions of the first bow limb are split-limb portions of the split-limb first bow limb. 
     Example 6 
     The bow of any one of Examples 1 through 5 wherein the first transverse axle is retained in a pair of coaxial bores through the spaced-apart portions of the first bow limb at any one of the multiple axle positions along the first rotation axis by engagement of the first transverse axle with the first bow limb. 
     Example 7 
     The bow of Example 6 wherein (i) one or both lateral portions of the first transverse axle are externally threaded, (ii) one or both of the pair of coaxial bores are internally threaded, (iii) engagement of the first transverse axle with the first bow limb is effected by threaded engagement of each threaded lateral portion of the first transverse axle in a corresponding one of the threaded bores of the first bow limb, and (iv) movement of the first transverse axle along the first rotation axis is effected by rotation of the first transverse axle threadedly engaged in one or both of the bores. 
     Example 8 
     The bow of Example 7 wherein one or more internally threaded retaining members are threadedly engaged on the first transverse axle and are arranged so that tightening the one or more retaining members against the first bow limb retains the first transverse axle at one of the multiple axle positions. 
     Example 9 
     The bow of any one of Examples 7 or 8 wherein two or more retaining flanges are positioned on the first transverse axle and are arranged so that securing the two or more retaining flanges to the first transverse axle with the two or more retaining flanges positioned against the first bow limb retains the first transverse axle at one of the multiple axle positions. 
     Example 10 
     The bow of any one of Examples 7 through 9 wherein one or more set screws are threadedly engaged in one or more corresponding threaded holes in the first bow limb and are arranged so that tightening the one or more set screws against the first transverse axle in at least one of the bores retains the first transverse axle at one of the multiple axle positions. 
     Example 11 
     The bow of any one of Examples 7 through 10 wherein at least one of the pair of bores of the first bow limb is arranged as a clamp, and each clamp is arranged so that tightening the clamp retains the first transverse axle at one of the multiple axle positions. 
     Example 12 
     The bow of any one of Examples 7 through 11 wherein a resilient member is disposed within at least one of the bores against threads of the transverse axle and arranged so as to effect frictional engagement of the transverse axle with at least one of the bores. 
     Example 13 
     The bow of any one of Examples 6 through 12 wherein at least one or both lateral portions of the first transverse axle are externally threaded, and two or more internally threaded retaining members are threadedly engaged on the first transverse axle and are arranged so that tightening the one or more retaining members against the first bow limb effects engagement of the first transverse axle with the first bow limb and retains the first transverse axle at one of the multiple axle positions. 
     Example 14 
     The bow of any one of Examples 6 through 13 wherein two or more retaining flanges are positioned on the first transverse axle and are arranged so that securing the two or more retaining flanges to the first transverse axle with the two or more retaining flanges positioned against the first bow limb effects engagement of the first transverse axle with the first bow limb and retains the first transverse axle at one of the multiple axle positions. 
     Example 15 
     The bow of any one of Examples 6 through 14 wherein one or more set screws are threadedly engaged in one or more corresponding threaded holes in the first bow limb and are arranged so that tightening the one or more set screws against the first transverse axle in one or both of the pair of bores effects engagement of the first transverse axle with the first bow limb and retains the first transverse axle at one of the multiple axle positions. 
     Example 16 
     The bow of any one of Examples 6 through 15 wherein the pair of bores of the first bow limb are each arranged as a clamp, and each clamp is arranged so that tightening the clamp effects engagement of the first transverse axle with the first bow limb and retains the first transverse axle at one of the multiple axle positions. 
     Example 17 
     The bow of any one of Examples 1 through 16 wherein the first pulley member is retained on the first transverse axle at any one of the multiple pulley positions along the first transverse axle by engagement of the first pulley member with the first transverse axle. 
     Example 18 
     The bow of Example 17 wherein (i) at least a central portion of the first transverse axle is externally threaded, (ii) a central bore of the first pulley member is internally threaded, (iii) retention of the first pulley member at any one of the multiple positions along the first transverse axle is effected by threaded engagement of the externally threaded portion of the transverse axle in the internally threaded central bore of the pulley member and by an internally threaded retaining member threadedly engaged on the central portion of the first transverse axle and tightened against a side of the first pulley member, and (iv) the transverse axle and the pulley member are arranged so that movement of the first pulley member along the first transverse axle is effected by rotation of the transverse axle relative to the threadedly engaged pulley member. 
     Example 19 
     The bow of any one of Examples 16 or 17 wherein (i) at least a central portion of the first transverse axle is externally threaded, (ii) engagement of the first pulley member with the first transverse axle is effected by retention of the first pulley member at any one of the multiple positions along the first transverse axle between a pair of internally threaded retaining members threadedly engaged on the central portion of the first transverse axle and tightened against opposite sides of the first pulley member, and (iii) the transverse axle and the pair of retaining member are arranged so that movement of the first pulley member along the first transverse axle is effected by rotation of the pair of retaining members threadedly engaged on the central portion of the first transverse axle and positioned against the opposite sides of the first pulley member. 
     Example 20 
     The bow of any one of Examples 16 through 18 wherein engagement of the first pulley member with the first transverse axle is effected by retention of the first pulley member at any one of the multiple positions along the first transverse axle between a pair of retaining flanges secured in any pair of multiple flange positions on a central portion of the first transverse axle and positioned against opposite sides of the first pulley member. 
     Example 21 
     The bow of any one of Examples 1 through 20, further comprising a transverse coupling member and a pair of spaced-apart secondary power cables, wherein (i) the transverse coupling member is connected to the bow by the pair of transversely spaced-apart flexible secondary power cables, (ii) the power cable is connected to the transverse coupling member at any one of multiple cable positions along the transverse coupling member between the pair of secondary power cables, and (iii) the coupling member and the pair of secondary power cables are arranged so as to couple the power cable to the bow. 
     Example 22 
     A compound archery bow comprising: (a) a substantially rigid riser; (b) a first resilient bow limb extending from a first end portion of the riser; (c) a second resilient bow limb extending from a second end portion of the riser; (d) a first pulley member mounted on and rotatable relative to the first bow limb around a first transverse rotation axis, wherein the first pulley member includes a first draw cable groove and a power cable take-up mechanism; (e) a second pulley member mounted on and rotatable relative to the second bow limb around a second transverse rotation axis, wherein the second pulley member includes a second draw cable groove; (f) a draw cable engaged with the first and second draw cable grooves and arranged to rotate the first and second pulley members as the bow is drawn and the draw cable is let out from the first and second draw cable grooves; (g) a power cable (i) engaged to be taken up by the power cable take-up mechanism of the first pulley member as the bow is drawn and the first pulley member rotates and (ii) coupled to the bow so as to cause deformation of one or both bow limbs as the power cable is taken up; and (h) a transverse coupling member and a pair of spaced-apart secondary power cables, wherein (i) the transverse coupling member is connected to the bow by the pair of transversely spaced-apart flexible secondary power cables, (ii) the power cable is connected to the transverse coupling member at any one of multiple cable positions along the transverse coupling member between the pair of secondary power cables, and (iii) the coupling member and the pair of secondary power cables are arranged so as to couple the power cable to the bow. 
     Example 23 
     The bow of any one of Examples 21 or 22 further comprising: (g′) a second power cable (i) engaged to be taken up by a second power cable take-up mechanism of the second pulley member as the bow is drawn and the second pulley member rotates and (ii) coupled to the bow so as to cause deformation of one or both bow limbs as the power cable is taken up; and (h′) a second transverse coupling member and a second pair of spaced-apart secondary power cables, wherein (i) the second transverse coupling member is connected to the bow by the second pair of transversely spaced-apart flexible secondary power cables, (ii) the second power cable is connected to the second transverse coupling member at any one of multiple cable positions along the second transverse coupling member between the second pair of secondary power cables, and (iii) the second coupling member and the second pair of secondary power cables are arranged so as to couple the second power cable to the bow. 
     Example 24 
     The bow of any one of Examples 21 through 23 wherein (i) a power cable anchor is engaged with a central portion of the transverse coupling member so as to substantially prevent lateral tilting of the power cable anchor relative to the transverse coupling member, (ii) the power cable is connected to the power cable anchor at a point that is displaced from an axis defined by the transverse coupling member, and (iii) the power cable is connected to the transverse coupling member by engagement of the power cable anchor with the central portion of the transverse coupling member. 
     Example 25 
     The bow of any one of Examples 21 through 24 wherein the power cable is coupled to the bow at the second bow limb, the second transverse axle, or the second pulley member. 
     Example 26 
     The bow of any one of Examples 21 through 25 wherein (i) at least a central portion of the transverse coupling member is externally threaded, (ii) a power cable anchor is engaged with the central portion of the transverse coupling member, (iii) the power cable is connected to the power cable anchor, and (iv) the power cable is connected to the transverse coupling member by engagement of the power cable anchor with the central portion of the transverse coupling member. 
     Example 27 
     The bow of Example 26 wherein (i) the power cable anchor is internally threaded and is threadedly engaged on the central portion of the transverse coupling member, and (ii) movement of the power cable anchor along the transverse coupling member is effected by relative rotation of the transverse coupling member and the power cable anchor, thereby altering the cable position where the power cable is connected to the transverse coupling member. 
     Example 28 
     The bow of any one of Examples 26 or 27 wherein (i) one or more internally threaded retaining members are threadedly engaged on the central portion of the transverse coupling member, (ii) engagement of the power cable anchor with the transverse coupling member is effected by tightening the one or more retaining members against the power cable anchor, and (iii) movement of the power cable anchor among the multiple cable positions along the transverse coupling member is effected by relative rotation of the transverse coupling member and one or more of the retaining members threadedly engaged on the transverse coupling member, thereby altering the cable position where the power cable is connected to the transverse coupling member. 
     Example 29 
     The bow of any one of Examples 26 through 28 wherein the power cable is looped around the power cable anchor in a peripheral groove thereof. 
     Example 30 
     The bow of any one of Examples 21 through 25 wherein (i) at least a central portion of the transverse coupling member has a set of multiple circumferential grooves arranged along the transverse coupling member, and (ii) each one of the multiple grooves defines a corresponding one of the multiple cable positions. 
     Example 31 
     The bow of Example 30 wherein the power cable is looped around the transverse coupling member in one of the multiple grooves. 
     Example 32 
     The bow of Example 30 wherein (i) a power cable anchor is positioned on the central portion of the transverse coupling member and is engaged with one of the multiple circumferential grooves, and (ii) the power cable is connected to the power cable anchor. 
     Example 33 
     The bow of Example 32 wherein the power cable is looped around the power cable anchor in a peripheral groove thereof. 
     Example 34 
     The bow of any one of Examples 21 through 25 wherein (i) a power cable anchor is positioned on a central portion of the transverse coupling member, (ii) the power cable is connected to the power cable anchor, and (iii) the power cable anchor is held at any one of the multiple cable positions by a set screw, by being arranged as a one or two-piece clamp, or by one or more retainers on the transverse coupling member. 
     Example 35 
     The bow of Example 34 wherein the power cable is looped around the power cable anchor in a peripheral groove thereof. 
     Example 36 
     The bow of any one of Examples 21 through 25 wherein (i) at least a central portion of the transverse coupling member includes a set of external threads, (ii) the power cable is looped around the transverse coupling member in one of the external threads, and (iii) the bow is arranged so that movement of the looped power cable along the transverse coupling member is effected by relative rotation of the transverse coupling member and the looped power cable. 
     Example 37 
     The bow of any one of Examples 21 through 36 wherein the secondary power cables are connected to the second bow limb. 
     Example 38 
     The bow of any one of Examples 21 through 36 wherein the secondary power cables are connected to the second transverse axle. 
     Example 39 
     The bow of any one of Examples 21 through 36 wherein the secondary power cables are connected to the second pulley member, and the second pulley member is arranged so as to let out the secondary power cables over a latter portion of drawing the bow. 
     Example 40 
     The bow of Example 39 wherein the second pulley member is arranged so as to take up the secondary power cables over an initial portion of drawing the bow. 
     Example 41 
     The bow of any one of Examples 39 or 40 wherein the second pulley member includes paired let-out members disposed on opposite sides of the second bow limb, and each one of the pair of secondary power cables is connected to a corresponding one of the paired let-out members. 
     Example 42 
     The bow of Example 41 wherein the paired let-out members comprise a pair of power cable anchors that are eccentrically positioned relative to the second rotation axis. 
     Example 43 
     The bow of any one of Examples 21 through 42 wherein lengths of the secondary power cables of the pair differ from each other. 
     Example 44 
     The bow of any one of Examples 21 through 43 wherein the pair of secondary power cables is arranged so as to enable adjustment of relative lengths of the secondary power cables of the pair. 
     Example 45 
     A method for adjusting the bow of Example 44, the method comprising altering the relative lengths of the secondary power cables of the pair. 
     Example 46 
     A method for rigging the bow of any one of Examples 21 through 44, the method comprising: (A) engaging the draw cable with the first and second draw cable grooves so that the first and second pulley members rotate and let out the draw cable as the bow is drawn; (B) connecting the transverse coupling member to the bow with the pair of secondary power cables, and connecting the power cable to the transverse coupling member at a selected one of the multiple cable positions along the transverse coupling member; and (C) engaging the power cable with the power cable take-up mechanism so that the power cable is taken up as the first pulley member rotates as the bow is drawn, thereby causing deformation of one or both bow limbs. 
     Example 47 
     A method for adjusting the bow of any one of Examples 21 through 44, the method comprising moving the power cable from a first one of the multiple cable positions along the transverse coupling member to a different, second one of the multiple cable positions along the transverse coupling member. 
     Example 48 
     A method for rigging the bow of any one of Examples 1 through 20 or 22 through 44, the method comprising: (A) fixing the first pulley member at a selected one of the multiple transverse positions along the first rotations axis; (B) engaging the draw cable with the first and second draw cable grooves so that the first and second pulley members rotate and let out the draw cable as the bow is drawn; and (C) coupling the power cable to the bow and engaging the power cable with the power cable take-up mechanism so that the power cable is taken up as the first pulley member rotates as the bow is drawn, thereby causing deformation of one or both bow limbs. 
     Example 49 
     A method for adjusting the bow of any one of Examples 1 through 20 or 22 through 44, the method comprising moving the first pulley member from a first one of the multiple transverse positions along the first rotations axis to a different, second one of the multiple transverse positions along the first rotations axis. 
     The embodiments (processes, machines, articles, or compositions) described or shown herein are only examples presented to demonstrate inventive subject matter; any appearance of the term “embodiment” should be regarded as implicitly including the modifying term “example” if that modifier is not explicitly included. It is intended that equivalents of the disclosed embodiments shall fall within the scope of the present disclosure or appended claims. It is intended that the disclosed embodiments, and equivalents thereof, may be modified while remaining within the scope of the present disclosure or appended claims. 
     In the foregoing Detailed Description, various features may be grouped together in several disclosed example embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that any claimed embodiment requires more features than are expressly recited in the corresponding claim. Rather, as the appended claims reflect, inventive subject matter may lie in less than all features of any single disclosed example embodiment. Thus, the appended claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separate disclosed example embodiment. However, the present disclosure shall also be construed as implicitly disclosing any embodiment having any suitable set of one or more disclosed or claimed features (i.e., a set of features that are neither incompatible nor mutually exclusive) that appear in the present disclosure or the appended claims, including those sets that may not be explicitly disclosed herein. In addition, for purposes of disclosure, each of the appended dependent claims shall be construed as if written in multiple dependent form and dependent upon all preceding claims with which it is not inconsistent. It should be further noted that the scope of the appended claims does not necessarily encompass the whole of the inventive subject matter disclosed herein. 
     For purposes of the present disclosure and appended claims, the conjunction “or” is to be construed inclusively (e.g., “a dog or a cat” would be interpreted as “a dog, or a cat, or both”; e.g., “a dog, a cat, or a mouse” would be interpreted as “a dog, or a cat, or a mouse, or any two, or all three”), unless: (i) it is explicitly stated otherwise, e.g., by use of “either . . . or,” “only one of,” or similar language; or (ii) two or more of the listed alternatives are mutually exclusive within the particular context, in which case “or” would encompass only those combinations involving non-mutually-exclusive alternatives. For purposes of the present disclosure and appended claims, the words “comprising,” “including,” “having,” and variants thereof, wherever they appear, shall be construed as open ended terminology, with the same meaning as if the phrase “at least” were appended after each instance thereof, unless explicitly stated otherwise. For purposes of the present disclosure or appended claims, when terms are employed such as “about equal to,” “substantially equal to,” “greater than about,” “less than about,” and so forth, in relation to a numerical quantity, standard conventions pertaining to measurement precision and significant digits shall apply, unless a differing interpretation is explicitly set forth. For null quantities described by phrases such as “substantially prevented,” “substantially absent,” “substantially eliminated,” “about equal to zero,” “negligible,” and so forth, each such phrase shall denote the case wherein the quantity in question has been reduced or diminished to such an extent that, for practical purposes in the context of the intended operation or use of the disclosed or claimed apparatus or method, the overall behavior or performance of the apparatus or method does not differ from that which would have occurred had the null quantity in fact been completely removed, exactly equal to zero, or otherwise exactly nulled. 
     In the appended claims, any labelling of elements, steps, limitations, or other portions of a claim (e.g., first, second, etc., (a), (b), (c), etc., or (i), (ii), (iii), etc.) is only for purposes of clarity, and shall not be construed as implying any sort of ordering or precedence of the claim portions so labelled. If any such ordering or precedence is intended, it will be explicitly recited in the claim or, in some instances, it will be implicit or inherent based on the specific content of the claim. In the appended claims, if the provisions of 35 USC §112(f) are desired to be invoked in an apparatus claim, then the word “means” will appear in that apparatus claim. If those provisions are desired to be invoked in a method claim, the words “a step for” will appear in that method claim. Conversely, if the words “means” or “a step for” do not appear in a claim, then the provisions of 35 USC §112(f) are not intended to be invoked for that claim. 
     If any one or more disclosures are incorporated herein by reference and such incorporated disclosures conflict in part or whole with, or differ in scope from, the present disclosure, then to the extent of conflict, broader disclosure, or broader definition of terms, the present disclosure controls. If such incorporated disclosures conflict in part or whole with one another, then to the extent of conflict, the later-dated disclosure controls. 
     The Abstract is provided as required as an aid to those searching for specific subject matter within the patent literature. However, the Abstract is not intended to imply that any elements, features, or limitations recited therein are necessarily encompassed by any particular claim. The scope of subject matter encompassed by each claim shall be determined by the recitation of only that claim.