CZ269295A3 - Method of introducing fiber sliver point into a spinning unit of a rotor spinning machine and apparatus for making the same - Google Patents

Abstract

Introduction of inserting tip of fiber strand (4) into rotor spinning machine spinning unit (1) is carried out by means of an inserting clamp (7) of handling apparatus (2). The inserting clamp (7) contains two inserting arms (71, 72) for clamping the fiber strand (4) when introducing the fiber strand (4) into the spinning unit (1). During insertion of the fiber strand (4) into the spinning unit (1), the clamping force of the inserting arms (71, 72) acting on the fiber strand (4) is at least once reduced to thereby causing partial opening of the inserting arms (71, 72) enabling thus passage of the fiber strand (4) into the spinning unit (1), whereupon after successful introduction of the fiber strand (4) into the spinning unit (1) they are completely opened to thereby achieving a reliable guidance of the fiber strand (4) during introduction thereof into the spinning unit (1) and thus increase of efficiency of this method.

Description

A method for introducing a fiber sliver insertion tip into a spinning unit of a rotor spinning machine. shy 'Jj' J «'!

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The invention relates to a method of introducing a fiber sliver insertion tip ^; --------------— .. da-spinning ... units..rotproy.éhp. .dopřádacího stroje_ pomocí_ boot skřipceobsiužněhozanzěníi'ktěrý'čbšahuje ^"_ two zaváděcíramena'pro- grip the sliver, which is on the sliver during its introduction into the spinning unit has a clamping force.

Further, the invention relates to a device for introducing a fiber sliver insertion tip into a spinning unit of a rotor spinning machine comprising an introducing gripper with two insertion arms for clamping a sliver, at least one of which is mounted reciprocably adjustable to the other insertion arm and coupled to the reciprocating drive The two gripper insertion arms are displaceably displaceable to the spinning unit.

BACKGROUND OF THE INVENTION

To date, a device according to CZ PV 2896 (US5,934,683) for introducing an end of a treated strand of fibers is known which comprises a gripper provided with two insertion arms, at least one of which is rotatably supported. The strand of fibers is fed into the spinning unit

By means of these insertion arms, it causes the device to become strong. which is from the moment of clamping of the sliver to the time of introduction of the treated fiber

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15.10.1995 ends of strand of fibers into the spinning unit the same. The amount of this clamping force is chosen such that during the feeding the fiber strand is still held by the feeding arms, which allows the end to be adjusted as desired before feeding to the spinning unit. This still firmly tight grip of the fiber strand by one force causes problems during the actual introduction into the spinning unit, when the fiber strand moves towards the spinning unit and thus also the movement of the fiber strand relative to the feeding arms

I .-. Because of the great clamping force of the gripper insertion arms, this movement is impossible and the gripper insertion arms must be released, otherwise the strand will either be broken due to premature gripping of the strand by the feed unit of the spinning unit or the insertion tip will fall out. a strand of fibers from the inlet of the spinning unit due to its premature release.

Synchronization of the introduction of the sliver into the spinning unit and its release from the clamp is the cause. Often, it is an object of the invention to remedy this drawback.

The essence of the invention, * *

The object of the invention is achieved by a method of introducing the fiber sliver insertion point into the spinning unit of a rotor spinning machine by means of an insertion chuck of the service device, the invention being based on reducing the clamping force on the sliver at least once The fiber filaments by means of the feed arms, thereby closing the feed arms, will partially open, allow the fiber sliver to pass through the spinning unit and act until the feed is complete.

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15.10.1995 as a fiber strand guide.

This method allows the fiber strand to be firmly gripped by the feed arms in the phase of adjusting the end of the fiber strand to the shape of the leading spike and subsequently clamping the fiber strand with less force at the latest ^1. .

The essence of the device for introducing the fiber sliver insertion tip into the spinning unit of the rotor spinning machine consists in that the reciprocating drive of the first, inserter arm. or. The reciprocating drive of the second gripper arm is formed by a pneumatic cylinder, to whose one inlet a double-pressure pneumatic circuit is connected to the driver.

In this case, it is advantageous if the dual-pressure pneumatic circuit comprises two inlet branches connected to a first inlet of the actuating-pneumatic cylinder, in which a shut-off valve is arranged in the first inlet branch and a release valve in the second inlet branch. air pressure reducing unit. ’.

*

This simple solution achieves the aforementioned method, wherein the dual-pressure pneumatic circuit makes it easy to vary and adjust the magnitude of both forces exerted by the gripper clamping arms on the fiber strand when it is introduced into the spinning unit.

Overview of the drawings

An exemplary embodiment of the device according to the invention is shown in FIG

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1 shows a horizontal cross-section of the spinning unit and the operating device in the place of the device for introducing the fiber sliver tip into the spinning unit, FIG. 2 is a side view of the device according to FIGS. control pneumatic cylinder.

EXAMPLES OF THE INVENTION

The insertion of the fiber sliver into the spinning unit of the rotor spinning machine is formed as part of one of the known mechanisms of the service device 2, which is displaceably arranged along the workstations of the machine in a known manner at any desired workstation. Each work station of the rotor spinning machine comprises a spinning unit 1, in which a fiber sliver 4 is inserted for feeding into the spinning unit.

1. The fiber sliver insert tip is the end of the fiber sliver adapted to be fed into the spinning unit 1. The actual treatment of the fiber sliver end can be carried out either on the machine that has placed the fiber sliver in the sliver or. by a special device or a service device 2 before being introduced into the spinning unit.

1 and 2, there is shown an operating device 2 comprising an insertion head 5 for handling the fiber sliver 4. On the insertion head 5, an axial insertion pneumatic cylinder 6 is mounted in a known manner, on the movable part of which an insertion clamp is mounted

Which is provided with a first insertion arm and a second insertion arm 72, at least one of which is displaceably arranged relative to

PS3113CZ

15.10.1995 the second for. in order to clamp the fiber sliver 4, the two feed arms 71, 72 being displaceably displaceable towards the spinning unit 1.

With at least one guide arm 71, 72 a reciprocating 'drive' is coupled, which in the exemplary embodiment consists of an axial pneumatic cylinder 73. However, it may also be a rotary pneumatic cylinder or other known device, such as a stepper motor. The movable part> 731 of the pneumatic cylinder 73` is coupled to at least one guide arm 71, 72. '

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The body of the pneumatic cylinder 73 is provided with a first compressed air inlet 732 ' and a second compressed air inlet 733. In the illustrated embodiment, it forms part of the introducing receptacle 7.

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To the inputs 732, 733 of the actuating, pneumatic cylinder. 73, a control pneumatic circuit 8 is connected as shown in FIG. 3.

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The control pneumatic circuit 8 comprises a return pneumatic circuit 81 and a two-pressure pneumatic circuit 82, both of which are via a manual valve 84 and a base pressure setting unit p1. The air duct is connected to a source of compressed air 83. Said setting unit 85 of the basic air pressure p ₁ is connected to the input node 86 to which are also connected to the input branches 821 and 822 dvoutlakého pneumatic circuit 82 and the input branch 811 reciprocating pneumatic circuit 81, which is also the base pressure P !.

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The inlet branch 811 of the return pneumatic circuit 81 opens into a z- ¹⁰

a return valve 812 whose outlet communicates with the second inlet 733

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In the entire return pneumatic circuit 81, with the return valve 812 open, the basic pressure p _{b. The} return valve 812 may be any suitable known pneumatic valve with electric control.

Dvoutlakého input part of pneumatic circuit 82 comprises a first input branch 821, which leads to a pinching valve 8211, whose output is' propojen_s prvním_vstupem 732 actuating the pneumatic cylinder 73. In the znázorněnéhopříkladuprovedení ^_ mezisvírací ventilSžll aprvnívstup actuating the pneumatic cylinder 73 is inserted a known non-return valve 87. The second input the inlet port 822 of the dual-pressure pneumatic circuit 82 opens into an air pressure reducer 8221, beyond which the second inlet port 822 has a reduced pressure p1. A discharge valve 8222 is connected to the outlet of said air pressure reducer 8221, the output of which is connected to / from the first inlet 732 of the actuating pneumatic cylinder 73. Also in this second inlet branch 822, a non-return valve 87 is common to both inlet branches 821 and 822 of the dual pressure circuit 82. In the case of opening the release valve 8222, downstream of the reduction unit 8221 in the second inlet branch 822 of the double pressure circuit 82 is inserted. reduced pressure p ₂ .

The clamp valve 8211 and the release valve 8222 may be any known electrically operated pneumatic valve. Base pressure p! is greater than the reduced pressure p ₂ .

In the course of: introducing the introducing tip of the sliver 4 into the spinning thread

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15.10.1995

7 ' of the rotor spinning machine 1, the fiber strand 4 enters the introducing receptacle 7 between its first introducing arm 71 and the second introducing arm 72, which initially tightens it as a result of opening the clamping valve 8211 of the two-pressure pneumatic circuit 82 and via a check valve 87 and a first inlet 732 into the working space of the actuating pneumatic cylinder 73. In this state, the fiber sliver 4 is handled that require a firm grip of the fiber sliver 4 between the insertion arms 71, 72, e.g. 4 'of fibers to form the leading end of the sliver 4', introducing the leading end of the sliver 4 into the inlet opening

J in the spinning unit 1 and the like.

After the introduction of the insertion spike into the inlet opening of the spinning unit 1 in front of the known feed mechanism by forward movement of the insertion arms 71, 72 of the clamp 7 clamped with maximum force and engagement of the insertion spike of fiber. 8222 to the pneumatic circuit 82, whereby the pressure of the air entering the working chamber of the control pneumatic cylinder 73 through the first inlet 732 of the insertion arms of the gripper 7 is reduced from the basic pressure p to the reduced pressure p _; and thereby the feeding arms 71, 72 are slightly separated from each other and releasing the squeezing of the fiber sliver 4, which can now pass between the said feeding arms 71, 72 into the spinning unit 1 into which it is drawn by the known fiber sliver feeding device. To the above-mentioned reduction of the basic pressure to the value of the reduced pressure p ₂ i

it may already occur during the insertion of the insertion tip of the insertion unit, provided that the respective fiber sliver material 4 is verified.

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15.10.1995

Upon completion of the introduction of the fiber strand 4 into the spinning unit 1, when the fiber strand 4 is already fully inserted and there is no risk of falling out, the double-pressure pneumatic circuit 82 release valve 8222 is closed while the double-pressure pneumatic circuit 82 sv clamp valve remains closed and The return air circuit valve 812 is thereby supplied to the return working space of the actuating pneumatic cylinder via a second inlet 733 at a basic pressure p _d and the movable portion 731 of the actuating pneumatic cylinder 72 returns to -the default position, whereby the insertion arms 7Ϊ, 72 of the gripper 7 are spaced apart and the fiber strand 4 is released therefrom.

Claims (3)

PATENT CLAIMS 1 / A method of introducing a fiber sliver insertion tip into a spinning unit of a rotor spinning machine by means of an introducing clip of a service device comprising two fiber sliver insertion arms which exert a clamping force on the fiber sliver during its introduction into the spinning unit. during the introduction of the fiber sliver (4) into the spinning unit (1), prior to the opening of the loading arms (71, 72), the suction force exerted on the fiber sliver (4) by the loading arms (71, 72) is reduced at least once, thereby 72) partially open, allow the fiber sliver (4) to pass into the spinning unit (1) and act as a fiber sliver guide (4) until the insertion is completed. , An apparatus for carrying out a method of introducing a fiber sliver insertion tip into a rotor spinning machine spinning unit according to claim 1, comprising an introducing gripper with two insertion arms for clamping the sliver, at least one of which is mounted reversibly adjustable relative to the other insertion arm and coupled to the return drive and control circuit connected thereto, wherein both gripper feed arms are displaceably displaceable to the spinning unit, characterized in that the reversible drive of the first gripper arm (71) and / or the reversible drive of the second gripper arm (72) is formed by the gripper (7). a pneumatic cylinder (73) to which one inlet (732 or 733) is connected a two-pressure pneumatic control circuit (82). r r i 15.10.1995 Apparatus according to claim 2, characterized in that the double-pressure pneumatic circuit (82) comprises two inlet branches (821, 822) connected to a first inlet (732) of the actuating pneumatic cylinder (73), wherein a clamping valve is arranged in the first inlet branch (8211) and in the second inlet branch (822) is provided a release valve (8222), which is preceded by an air pressure reduction unit (8221).