【20160406】Kinematic inversion& G, g, @+ ?: q& ~0 n& A5 D: W. x
運動倒置 b. z2 V) K# a0 Z9 c3 g
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The cam will be imagined as being stationary.
) X# V/ n8 U% qThe follower then should be rotated opposite to the direction of cam rotation." a9 t4 ~1 l7 _! v/ T2 z2 M. x* u
The desired location for the follower, at several positions, is constructed from the base circle.
: F+ B- k& M+ v6 q2 c1 P假定凸輪不動,從動件沿相反方向轉動,在基圓上畫出從動件的幾個預期運動位置。$ C9 [! l* n' J- g* A9 i0 B
: J X: p. T$ q+ d0 N7 V! `To creating the cam shape: wrapping the displacement diagram around the base circle.3 }. K! c9 v8 o `; L
設計凸輪形狀時,用從動件位移圖上的位移將基圓“包裹”起來。6 G+ @& U- h& e( c. l
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具體例子:2 ~& I# a7 D+ S& {: E X
① In-Line Knife-Edge Follower 對心直動尖頂從動件凸輪( y* F. e5 J& \" x, E v5 O
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' ^4 [/ ]$ h4 T% T6 |6 X; R1. Draw the base circle of radius.
. r! d3 c: A4 p: f, z+ G3 Z5 y# Z2. Draw the follower in the home position.
3 N$ P3 p: b- y/ f3. Draw radial lines from the center of the cam, corresponding to the cam angles identified on the displacement diagram.
( d" {( o- S8 f* ^, f; l/ o+ ?4. The follower will be rotated in a direction opposite to the actual cam rotation.
' {" P7 i7 g6 b+ q5. Transfer the displacements from the displacement diagram to the radial lines.
$ K! B& O$ J8 Z1 }% N6. Measure the displacements from the base circle.
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3 B! l' a1 K/ y9 F: s3 i1.畫出制定半徑的基圓。2 @: y m( H5 h5 S8 {0 ^
2.畫出初始位置的從動件。
* L# Z, g% v8 D& w, q3.從中心畫出基圓的徑向線,角度與位移圖上橫軸凸輪角度相對應。" M# v4 q" n8 U. r7 d) _
4.從動件與凸輪真實運動方向相反。
- U! n1 l( n6 W+ j. o' T# y- s5.將位移移到徑向線上。
( C8 b7 J4 j8 N ]" i6.測量從動件遠離凸輪基圓的距離。
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4 ^0 }1 l8 l& j' _; A② Offset Roller Follower 偏置滾輪從動件
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; _) \3 z) B* F) Z* P1. Draw the base circle of radius.1 t$ s! R l! ^0 N9 Y
2. Draw the follower centerline in the home position.$ y- K7 I- {8 b! @0 X
3. Draw the prime circle.
: J# U+ K) g( C; [( L9 n4. Draw the follower in the home position of radius.
4 ^* S/ r' G7 W9 ]4 y2 c5. Draw an offset circle of radius, which will be tangent to the follower centerline.' H7 b8 D# ~5 @: s( K
6. Draw lines tangent to the offset circle, corresponding to the reference cam angles on the displacement diagram.
+ \6 O3 Z( m* }% |7. The follower will be rotated in a direction opposite to the actual cam rotation.3 ]+ O @3 P5 P1 z5 \" C" K* {
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1.畫出制定半徑的基圓。5 C4 \9 V2 s5 r! |( R* n; c3 ]
2.畫出初始位置的從動件中心線。
2 l0 U2 \7 w C/ `1 Z3.畫出理論廓線。7 d: J/ H1 R) F4 B- K
4.畫出初始位置的從動件。
! Q5 t/ y) O. {: C1 J5.以偏心距為半徑畫圓,與從動件中心線相切。9 W0 {5 F2 w" a
6.與偏距圓相切畫線,角度與位移圖上橫軸凸輪角度相對應。% v: f; f5 B9 ?9 K; K$ ?
7.從動件與凸輪真實運動方向相反。6 }8 G m9 @3 d
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