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A SPINNING MACHINE ]
BACKGROUND OF THE INVENTION j
1. Field of the Invention {
This invention relates to a spinning machine. I
2. Description of the Related Art
Conventionally, there is known a spinning unit adapted to
draft a fiber bundle and twist the drafted fiber bundle to produce
a spun yarn (see e.g., Japanese Unexamined Patent Publication No.
2011-99192). The spinning unit includes a defect detecting section j
adapted to detect a defective part of the spun yarn, and a winding
section adapted to wind the spun yarn to form a package.
Conventionally, there is known a spinning machine including '
a plurality of spinning units (see e.g., Japanese Unexamined Patent i
Publication No. 2011-84854). The spinning machine includes an [
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operation cart. When continuation of the spun yarn is disconnected j
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in one of the spinning units, the operation cart travels to the j
relevant spinning unit to perform a yarn joining operation. The j
operation cart includes a braking section adapted to brake rotation j
of the package, a guiding section adapted to catch and guide the ]
spun yarn, and a yarn joining section adapted to join the yarn ends !
of the spun yarn. I
When the defect detecting section detects the defective part of the spun yarn, the spinning unit cuts the spun yarn to interrupt j
formation of the package. Upon arriving at the spinning unit, the
operation cart makes the braking section to contact with the package
and stops the rotation of the package. Thereafter, the operation cart catches the spun yarn and guides the spun yarn to a prescribed j
position by the guiding section, removes the defective part with 1
the yarn joining section, and joins the yarn ends of the spun yarn.
Through such series of steps, the spinning unit can resume the
formation of the package.
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^ WE CLAIM:
1. A spinning machine comprising:
a plurality of spinning units, each spinning unit being
adapted to wind a spun yarn to form a package,
a braking section adapted to make contact with the rotating
package to brake rotation of the package,
a driving section adapted to drive the braking section to make
contact with or separate from the package, and
a control section adapted to control the driving section to
variably adjust a contacting time of the package and the braking
section by transmitting a control signal to the driving section.
2. The spinning machine according to claim 1, wherein the
control section is adapted to variably adjust the contacting time
in accordance with an outer diameter of the package.
3. The spinning machine according to claim 1 or claim 2,
wherein the control section is adapted to variably adjust the
contacting time in accordance with a travelling speed of the spun
yarn wound into the package.
4. The spinning machine according to any one of claim 1
through claim 3, further comprising an operation cart adapted to
travel to one of the spinning units when continuation of the spun
yarn is disconnected in such spinning unit and to perform a yarn
joining operation,
wherein the control section is adapted to control the
contacting time in accordance with a period of time from
disconnection of the spun yarn until an arrival of the operation
cart at the spinning unit.
5. The spinning machine according to any one of claim 1
through claim 4, further comprising:
an input section adapted to input the contacting time, and
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