Drive belts are provided with grooved surfaces which engage driving and driven members such as pulleys. These drive belts are typically formed in a piece of rubber or a flexible substrate material. The grooved surfaces of the substrates material are advanced through rotary cutters which form the grooves.
The present invention comprises one or more of the following features or features identified in the various independent claims and dependent claims appended to this application and combinations of such features.
Either individual cutting tools or, a plurality of cutting tools for cutting drive belts is provided and rotated about the axis of the arbor to cut grooves in the rubber substrate from which belts are formed. Each tool comprises a tool body having a central bore for receiving the arbor, axially spaced apart, radially extending opposite side faces, and an outer peripheral portion. A plurality of sets of cutting blades are removably coupled or mounted about the peripheral portion of each tool body. For example, a tool body which is approximately six to twelve inches {about 15 to 31 cm) in diameter may have four sets of three cutter blades per set peripherally spaced about each tool body. Each blade set will typically include a left-hand cutter blade, a right-hand cutter blade and a raker blade. These designations left-hand and right-hand are used herein for convenience in distinguishing the blades. The left-hand and right-hand blades have cutting edges provided with outwardly extending teeth which form the grooves in the drive belt surface. The raker blade, which typically follows the left-hand and right-hand cutter blades, cuts the flats between the grooves. The left-hand cutter blades have teeth which cut the left-hand edges of the grooves and the right-hand cutter blades have teeth which cut the right-hand edges of the grooves.
In some embodiments, for some applications, each blade set will typically include a left-hand cutter blade and a right-hand cutter blade. In such an embodiment, the raker blade may not be used and the left and right-hand cutter blades may be configured to cut the O.D. flat of the belt surface between the v-grooves. In such an embodiment, each cutting tooth on each of the left-hand blade and right-hand blade may be configured to cut at least a portion of the O.D. flat adjacent a v-groove cut by the tooth and, in some embodiments, each tooth will be configured to cut the entire O.D. flat between the v-groove cut by the tooth and the next adjacent v-groove.
Thus, in some embodiments, each of the left-hand and right-hand blades will serve to cut the left or right side of adjacent v-groove and, at the same time, without a separate raker blade, cut the O.D. flat between adjacent grooves.
The cutter blades are removably coupled to the outer peripheral portions of the tool bodies. The cutter blades, which may be removed and replaced as they wear out, may illustratively be accurately positioned in slots or cavities formed in the outer peripheral portion of each tool body. Each cutter blade is provided with three mounting points or locating protuberances which position the blade in its position on the tool body with its cutting edge extending radially outwardly from the outer peripheral portion of the tool body and its base portion or support portion extending radially inwardly of the outer peripheral portion. Each cutter blade may illustratively be positioned and held by combinations of screws and wedges which position and secure the blade in the tool body. Illustratively, each cutter blade will be carefully positioned on its tool body relative to the other cutter blades on the tool body and relative to similar cutter blades on adjacent tool bodies. Illustratively, each tool body may be provided with one or more recesses associated with each set of cutter blades on at least one of its side faces. Then, illustratively, each tool body may be provided with one or more axially extending protuberances associated with each set of cutter blades on one of its side faces. Such protuberances engage into such recesses to position adjacent tool bodies to align and orient the cutter blades on the tool bodies.
The present invention comprises removable blades, each of which has novel and unique features as discussed above. It is contemplated that such blades will be provided to end users as replacement blades as they wear out. Each blade is illustratively a generally flat blade having a base edge, a cutting edge, and two side edges. Each blade has a forwardly facing surface (forwardly in the direction of rotation of the tool body) and an opposite rearwardly facing surface. Each blade may illustratively have one or more holes through its body into which projections from a fastening wedge may extend to hold the blade in the tool body. Each blade may illustratively be provided with three mounting points or protuberances which will locate the blade relative to the tool body. Illustratively, two of these mounting points or locating protuberances may be on the base edge of the blade and one of the points or protuberances may be on a side edge of the blade. As indicated above, the blades will be provided in sets of three blades with one blade being a left-hand blade, one blade being a right-hand blade, and a third blade being a raker blade. The left-hand blade and the right-hand blade will have a plurality of pointed teeth extending outwardly from the cutting edge to form grooves as indicated above. In other embodiments, as indicated above, the blades will be provided in sets of two blades with one blade being a left-hand blade, and one blade being the right-hand blade and both blades configured to cut the belt O.D. flat between the adjacent grooves.
The left-hand blades and the right-hand blades are mountable on the tool body such that each left-hand blade and each right-hand blade defines a shear angle relative to a plane which includes the axis of the tool body and extends radially outwardly from the axis. Similarly, the raker blade is mountable on the tool body to define a shear angle relative to the plane defined above. The shear angle is in the range of 10-20 degrees. The raker blade also has a positive hook in the range of 10-30 degrees. As illustrated, the left-hand and right-hand blades have a zero degree hook.
In an embodiment where the raker function is incorporated in the left-hand and right-hand cutter blades, such cutter blades may have a hook angle in the range of 10-30 degrees.
The detailed description particularly refers to the accompanying figures in which:
FIGS. 3A-E are views of various cutter blades;
FIGS. 3F-K are views of various wedges used to engage the cutter blades;
As can be seen in
Cutter tools 12 each have axially spaced apart, radially extending side faces 16, 18, as can be seen in FIGS. 1C-D. Each cutter tool also has an outer peripheral portion 20 configured to receive and hold a plurality of replaceable blades 14 peripherally spaced about the peripheral portion 20, as can be seen in FIGS. 1A-D. As can be seen in FIGS. 3A-E, blades 14 are generally flat and have a front side 22, a back side 24 (seen in
Cutter tools 12 and their associated cutter blades 34, 36, 38 (collectively blades 14) are illustratively formed and arranged in the following fashion. Right-hand cutter blades 34 are given a shear angle (as indicated by reference number 46 in
Raker blades 38 also illustratively have a ‘hook’ angle—an angle at which the blade is placed in order to achieve an attack angle. Illustratively, raker blades 38 are mounted to have a positive 15 degree hook angle 54 on the lead side edge, as can be seen in FIGS. 1A-B. (Due to the shear of raker blade 38, the trailing side edge of raker blades 38 may have an approximate 20 degree hook angle.) The hook angle may range between 10-30 degrees, however. The positive hook angle creates an angle of attack for the cutting edge of raker blades 38.
Illustratively, as can be seen in
An illustrative tooth or blade is shown in each of
However, during the wear process, it has been determined that not only is friction reduced, the cutting edge 26 is also kept sharper when a smaller angle 58 (such as shown in
An illustrative elevation view of cutter blades 14 is shown in FIGS. 3A-E. As can be seen, each tooth-bearing cutter blade 34, 36 includes a plurality of high-profile teeth 60. The high-profile teeth are configured to cut either a right-side or a left-side of a V-shaped groove. As can be seen in
Illustratively, cutter blades 14 each also have three locating protuberances, of which two locating protuberances 66, 68 are located on the base edge 28 of the cutter blade 14 and one locating protuberance 70 is located on a side edge 32 of the cutter blade 14, as can be seen in
Each tooth is illustratively formed to have a right side angle 37 or a left side angle 35. In the right-hand cutter blade 34 shown in
Illustratively, cutter blades 14 are mounted on cutter tools 12 in the following fashion. A cutter blade 14 is positioned adjacent a wedge 80 (or alternative cutter blade 40 is positioned adjacent wedge 82) such that protrusions 78 extend through retainer holes 76 (visible in
The axial alignment of cutter blades 14, 40 is illustratively achieved in the following fashion. After cutter blade 14 or 40 is in its respective blade channel 86, a positioning screw 74 is threaded into a threaded hole on one of side faces 16, 18 of cutter tool 12 until the head 96 of positioning screw 74 abuts locating protuberance 70 of blade 14 or 40. Cutter blade 14 or 40 is then positioned axially as required to align the cutting teeth in the desired track to profile the flexible composite material as desired. A set screw 94 is then threaded into an opposite face 16, 18 of cutter tool 12 until it abuts positioning screw 74, thereby setting the “stop” position of positioning screw 74.
Illustratively, cutter tools 12 can be coaxially aligned on a shaft or arbor 11 and positioned such that they axially abut each other to form a single rotating cutter assembly 10, as can be seen in
End tool 42 has only one side face 17 with either protuberances 98, recesses 100, or both. The other side face 19 of end tool 42 is illustratively substantially flat because the additional tooling of the side face 17 is not necessary. It should be understood, however, that it is not necessary to use an end tool 42, and that a plurality of cutter tools 12 could be engaged together without an end tool 42.
In another embodiment, a single cutter tool 12 could be used, without the combination of other cutter tools 12.
Illustratively, when four sets of three cutter blades 14 each are spaced about each cutter tool 12, cutter tools 12 can only align with an adjacent cutter tool 12 in one of four positions in order to accomplish the staggered helical alignment goal discussed above. However, it should be understood that the present invention is not limited to this embodiment, and other alignment methods and constructions are within the scope of the disclosure.
It is within the scope of the disclosure to utilize sets of two cutter blades instead of sets of three. Such an embodiment could utilize a left-hand cutter blade and a right-hand cutter blade and not utilize a raker blade. One or the other of the cutter blades, or even both cutter blades, could be configured to cut the outer diameter flat of the substrate. An illustrative set of cutter blades 102, 104 are shown in FIGS. 4A-D. Cutter blade 102 is a right-hand cutter blade shown from both the attack face 106 (
Each cutter blade 102, 104 has trailing surfaces 114, 116 (respectively) behind each tooth of the blade 102, 104. Illustratively, in the two-blade embodiment for a cutter tool, as shown in
Illustratively, cutter blades 102, 104 are mounted on cutter tool 118 at a positive rake angle of between 10-20 degrees, as can be seen in
In the illustrative embodiment shown in
It is within the scope of the disclosure to utilize a diamond or other hard surface material embedded finishing cutter (not shown) that finish grinds any substrate surface for which a modified surface finish is desired. It will be appreciated that such finish grinding cutters could be run in combination with a plurality of the insert cutters described herein to allow for highly productive combination of the cutting and finishing processes.
Another approach for using cutting blades (left-hand and right-hand cutting blades with teeth) with separate raker blades is shown in
This application claims priority under 35 U.S.C. 119(e) to U.S. Provisional Application Ser. No. 60/473,594, filed May 27, 2003, which is expressly incorporated by reference herein.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US04/16600 | 5/26/2004 | WO | 10/4/2005 |
Number | Date | Country | |
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60473594 | May 2003 | US |