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4 . T r a n s m i s s i o n s y s t e m s
4.1 Main transmission systems
4.1.1 Transmission route (fig.4-1)
Spindle motion is transmitted to I axis in the headstock via belt wheel and V belt. There is a bi-directional disc friction
clutch, used to control the spindle and stop.
Clutch clamps (left) —gear 1-6 or 2-7—> II axel gains 2 grades forward rotation.
Clutch clamps (right) —middle gear—> II axel gains 1 grade reverse rotation.
3-linked sliding gear on III axel, engaged with state gear 8, 9 or 10, transmits the motion to III axel.Motion, then, will go
to VI axel from III axel through the following 2 ways:
a. Motion on III axel —Gear 14—>gear 27 on the left of VI axel (high speed transmission route)
b. Motion on III axel—gear 15-17—>VI axel—gear 18, 19—>V axel—gear 20—>gear 21 on the right of VI axel (low
speed transmission route)Two gears 21and 24 that is covered on VI axel (spindle) get connected with VI axel via clutch.
It will get 6 kinds of high speeds with 14-24 once clutch moves left, while 6 kinds of low speeds once right.
transmission route：
ｍ ａ ｉ ｎ
—Ⅰ
1.1 4.1.2 calculation formula for spindle speeds (forward)
Here are the examples for the lowest and highest speeds of spindle.
● lowest speed
120
50
nmin=1440×
×
240
40
120
50
nmin=1760×
×
240
40
● highest speed
120
nmax=1440×
×
240
120
nmax=1760×
×
240
4.1.3 transmitting set of increasing pitch(U
ｍ ｏ ｔ ｏ ｒ — ｂ ｅ ｌ ｔ
ì
ü
28
ï
ï
44
ï
ï
ï
ï
ï ï
ï ï
17
í
ý
—Ⅱ—
—Ⅲ—
55
ï
ï
ï
ï
ï
ï
39
ï
ï
ï
ï
î
þ
33
17
33
33
32
×
×
×
×
=35r/min --------- 50HZ motor
55
66
66
64
17
33
33
32
×
×
×
×
=42r/min --------- 60HZ motor
55
66
66
64
58
39
50
×
×
=1600r/min--------- 50HZ motor
32
33
50
58
39
50
×
×
=1900r/min--------- 60HZ motor
32
33
50
)：
n
ｗ ｈ ｅ ｅ ｌ （
120
）
240
4 -
1
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