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【20160406】Kinematic inversion
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The cam will be imagined as being stationary.
s2 ^" ~$ ]6 d! iThe follower then should be rotated opposite to the direction of cam rotation.( ?: }1 J/ c- E G) C6 D4 W
The desired location for the follower, at several positions, is constructed from the base circle.- O, I D; m2 `, |4 W: V6 k/ h
假定凸輪不動,從動件沿相反方向轉(zhuǎn)動,在基圓上畫出從動件的幾個預(yù)期運(yùn)動位置。7 U% n; }3 f! |/ r8 U! Z5 L
5 Y1 v0 P$ _% S& QTo creating the cam shape: wrapping the displacement diagram around the base circle.$ O C# N* O& s
設(shè)計(jì)凸輪形狀時(shí),用從動件位移圖上的位移將基圓“包裹”起來。+ X& a0 p( A5 t8 K( N4 Q/ T
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具體例子:7 k9 T t+ V# _1 p$ P p
① In-Line Knife-Edge Follower 對心直動尖頂從動件凸輪
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1. Draw the base circle of radius.
3 @ j( n5 B7 v2. Draw the follower in the home position.) T3 t* P6 f9 F' k
3. Draw radial lines from the center of the cam, corresponding to the cam angles identified on the displacement diagram.
* X/ i" w: T4 f7 D. J4. The follower will be rotated in a direction opposite to the actual cam rotation.
7 J3 [, ~: K4 P+ I5. Transfer the displacements from the displacement diagram to the radial lines.
; u V h% O! v$ f& s4 _, R0 O4 G6. Measure the displacements from the base circle.
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1.畫出制定半徑的基圓。2 O- T" Q9 Z8 t( P k8 G
2.畫出初始位置的從動件。
% y$ x1 D9 J! ~3 J3 \' Z3.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(yīng)。
; C. ^/ M. j) {" ~0 o/ A0 X4.從動件與凸輪真實(shí)運(yùn)動方向相反。
& q: w; A( H7 k* }, c" `9 c i5.將位移移到徑向線上。* v( Y6 w" \3 Z0 i% X# e. [
6.測量從動件遠(yuǎn)離凸輪基圓的距離。
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② Offset Roller Follower 偏置滾輪從動件% @+ {3 V5 x( ]
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7 g3 O; C! |! O, \- P {1. Draw the base circle of radius.
6 k* ~& N( F* N% n1 q2. Draw the follower centerline in the home position.$ }) w& z2 M" w
3. Draw the prime circle.2 N) |* n- _7 R* ^* {5 K
4. Draw the follower in the home position of radius.
: g9 J- f. { R, L: A, l: z6 q5. Draw an offset circle of radius, which will be tangent to the follower centerline.5 e: C5 A$ U: n
6. Draw lines tangent to the offset circle, corresponding to the reference cam angles on the displacement diagram.
2 Y8 x7 \" r6 H: h: F7. The follower will be rotated in a direction opposite to the actual cam rotation.% r$ F& l/ d' A e* C$ \2 [; q& }
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1.畫出制定半徑的基圓。
2 r8 ]) t6 V4 E6 G. P# |2.畫出初始位置的從動件中心線。
! v# G4 {: \- r# E+ y; U3.畫出理論廓線。
5 d) w f G2 A! a7 ^$ u& Q, R4.畫出初始位置的從動件。/ U9 g4 T( z& D. _! h! v+ }
5.以偏心距為半徑畫圓,與從動件中心線相切。
% W$ L! p- u: w6.與偏距圓相切畫線,角度與位移圖上橫軸凸輪角度相對應(yīng)。6 r8 v, u/ [& [5 D6 d* y* G: s# G
7.從動件與凸輪真實(shí)運(yùn)動方向相反。
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