CN104947296A - Yarn-braking device for storage yarn feeders - Google Patents

Abstract

A first braking plate (32) is adapted to be coaxilly fixed to a delivery end of a drum (12). A second braking plate (40) is coaxially biased against the first one by elastic means (48) operatively engaged between the second braking plate (40) and an abutment (50). The yarn (Y) runs between the braking plates (36, 44), thereby receiving a braking action by friction depending on the pre-load of the elastic means. The abutment (50, 150) is operatively connected to a motor (54, 154), via rotary-to-translatory motion conversion means (58a, 64a, 150a, 151), for shifting in a direction such as the pre-load is varied. The motor (54, 154) is driven by a control unit (CU, CU') which modulates the pre-load in such a way as to maintain the tension of the yarn (Y) substantially constant on a desired level, on the basis of a signal generated by a tension sensor (70, 170) interacting with the yarn unwinding from the feeder.

Description

For the yarn arresting gear of yarn feeder

Technical field

The present invention relates to a kind of yarn arresting gear for yarn feeder.

Background technology

As everyone knows, the yarn feeder for Weaving device generally includes drum, and the multiple yarn rings forming reserve are wrapped on drum by motorized flywheel.The yarn extracted out from the spool of yarn feeder upstream in downstream machine (such as, such as loom) request under from drum untie, and through brake unit, brake unit comprises the weft brake that one or more is suitable for maintaining under tension the yarn untied.

WO91/14032 discloses a kind of weft brake, wherein radially advance between two opposed annular slabs from the yarn untied of drum, two opposed annular slabs be arranged in coaxially bulging before, and mutually against biased, for by friction catch yarn.The plate of drum side is fixing, and relative plate is biased by spring or with the electromagnetic actuators that the mode being applied to the braking action of yarn in order to adjustment controls against fixing plate.

Same in WO02/22483, the yarn untied also radially is advanced being arranged in coaxially between the opposed annular slab of drum above two.The plate of drum side is made up of magnetic material, and attends class at pin and axially slide.Relative plate is motionless, and has the electromagnet be arranged in thereafter, and electromagnet can be actuated to and attract moveable plate against fixing plate, and be applied on yarn by braking action thus, the electric current striding across electromagnet is depended in braking action.

Above two schemes all have the advantage that they do not need cleaning frequently, because the dust produced due to thread friction between brake area and paraffin are blown off by the spinning movement of the yarn untied from drum.

But these schemes all have following shortcoming, namely for some application, they do not allow along with the time adjusts the mean tension of yarn as required, to protect on the quality of finished article and finished article not existing defects.Such as, when the spool of yarn feeder upstream exhausts, yarn tension easily produces.In this case, it will be expect that brake apparatus adjusts its braking action automatically, feeds to tension force constant to compensate this change and to maintain.

In addition, in order to produce required brake force, all the time must supply the famous electromagnetic actuators with its high current drain, therefore there is high energy, especially in view of conventional textile/braiding apparatus is typically provided with the fact of tens yarn feeders of serving single downstream machine.

Other known brake apparatus is provided with the truncated cone braking element of the hollow be flexibly biased against the delivery end roused.These are such known applications of feeding the actuation force being built applying to tension adjustment by truncated cone also allowed based on yarn.As such as disclosed in EP0707102, due to high inertia and the morphotropism of truncated cone braking element, these schemes are unsuitable for some application.

Summary of the invention

Therefore, the object of the invention is a kind of weft brake for yarn feeder, this weft brake allows the mean tension along with time adjustment yarn, and do not suffer the above-mentioned shortcoming of known system, particularly about the system of Electromagnetic Control power consumption and about use hollow truncated cone braking element system mechanics restriction.

Above-mentioned purpose and being realized by the weft brake with feature according to claim 1 according to other advantage that following description will become apparent, and dependent claims set forth other favourable but secondary feature of the present invention.

Accompanying drawing explanation

Now will with reference to describing the present invention in more detail with some the preferred non-exclusive embodiments shown in the mode of unrestricted shape example in the accompanying drawings, wherein:

Fig. 1 is the view of the axial cross section of the end that the yarn feeder with the weft brake according to the first embodiment of the present invention mounted thereto is shown;

Fig. 2 shows the details of the amplification of Fig. 1;

Fig. 3 is the three-dimensional cutaway view of a part for weft brake shown in Fig. 1;

Fig. 4 is the view of the axial cross section of the parts of weft brake shown in Fig. 3;

Fig. 5 is similar to the view that Fig. 1 shows alternate embodiment of the present invention.

Fig. 6 is the view of the axial cross section of weft brake shown in Fig. 5;

Fig. 7 is the three-dimensional cutaway view of a part for weft brake shown in Fig. 6;

Fig. 8 is the stereogram of the parts of weft brake shown in Fig. 7.

Detailed description of the invention

Fig. 1 shows the end of yarn feeder.Yarn feeder 10 comprises drum 12, and drum 12 is suitable for having winding multiple yarn ring Y thereon to form reserve.Yarns Y is untied from drum 12 under the request of downstream machine (such as, loom (not shown)), and through being supported on the brake unit 14 arm 16 given prominence to from the main body (not shown) of feeder.Brake unit 14 comprises passive type weft brake 18 and the active weft brake 20 of general type, tension force is roughly stabilized in aspiration level, passive type weft brake 18 is suitable on the yarn untied at the 12a place, conveying limit static brake effect being applied to drum 12, and active weft brake 20 is suitable for adjusted braking action to be applied on the yarn in passive type weft brake 18 downstream.

In a way known, passive type weft brake 18 comprises frustoconical 22, and frustoconical 22 utilizes its inner surface to be biased against the conveying limit 12a of drum 12.Frustoconical 22 place outside it is supported coaxially by ring-shaped article 24, and ring-shaped article 24 is fixed to edge 26 coaxially.Edge 26 is to be supported by arm 16 in order to the mode of axially movement under the control of the screw mechanism 28 be incorporated in arm 16.Screw mechanism 28 can manually operate via knob 30, and for adjusting by frustoconical 22 against drum 12 applied pressure, and therefore static brake effect is applied to yarn by rubbing.

Concrete with reference to Fig. 2, active weft brake 20 comprises the opposed keep plate of a pair with circular section, and this is supported on before the delivery end of drum 12 coaxially to keep plate.First keep plate 32 is arranged in cylindrical support member 34, and cylindrical support member 34 is provided with flange end 34a, and cylindrical support member 34 is fixed to the delivery end of drum 12 coaxially via flange end 34a.The opposite end of cylindrical support member 34 has hemispherical seat 36, wherein receives the core 34a with the hemispherical section of cooperation of the first plate 34.Core 34a is axially clipped between hemispherical seat 36 and the locking member 38 of negative shape, and locking member 38 is axially screwed into the end of cylindrical support member 34.Permission first plate 34 is provided to couple around the spherical of the spot wobble on the axis being positioned at drum 12 thus.The outside 34b of the first keep plate 34 bends towards drum 12.Flat annular section 34c is limited between core 34a and outside 34b.

Second keep plate 40 is arranged in before the first keep plate 34 coaxially.Second keep plate 40 has away from drum bending inner edge 40a and outside 40b and restriction flat annular section 40c between which, and this annular section 40c is towards the annular section 34c of the first keep plate 34.Tubulose is given prominence to 40d and is given prominence to coaxially from the inner edge 40a of the second plate, and inserts in sleeve 42 slidably, and sleeve 42 is fixed to arm 16 (Fig. 1) via support member 44.Sleeve 42 away from the second keep plate 40 towards end be flanged in 42a, for anchoring to support member 44, and there is insertion yarn guide eyelet 46 wherein.

Second plate 40 is flexibly biased by spiral compression spring 48 against the first plate 34.Spring 48 is bonded between the second plate 40 and supporter, and in this embodiment, described supporter is by slide on the pin 52 being parallel to sleeve 42 and the sliding part 50 being fixed to support member 44 forms.Sliding part 50 can move under the control of linear step actuator 54.Linear actuators 54 is fixed to support member 44 via distance piece 56, and is provided with stem 58, and stem 58 has the end of thread being fixed to sliding part 50 by nut 60.

Fig. 4 is the schematic diagram of the axial cross section of actuator 54.Actuator 54 comprises shell 61, and shell 61 has the annular stator 62 be contained in wherein.The hollow rotor 64 inserted in stator 62 is supported via two bearings 66,68 by shell 61.Stem 58 is received in hollow rotor 64, and at 58a place through.Hollow rotor 64 internally passes at 64a place, and with being threadedly engaged of stem 58.Therefore, the spinning movement of hollow rotor 64 is converted to the horizontal movement of stem 58.

Actuator 54 drives (Fig. 1) by control unit CU, control unit CU is programmed for and regulates by the braking action of active weft brake 20 time according to producing signal by tension pick-up 70 in the mode of the level in order to yarn tension roughly to be maintained constant at expectation, tension pick-up 70 is arranged in the downstream of weft feeder 10, for measuring the tension force of the yarn untied from drum.

Be in operation, feeder 10 extracts yarns Y out from spool (not shown), and such as makes it be wrapped in the form of a ring on drum 12 in a per se conventional manner by weft yarn winding turning arm (not shown).The yarns Y untied from drum 12 under the request of loom first through static brake effect being applied to the passive type weft brake 18 yarn, then through active weft brake 20.In the example of application, when the spool of feeder upstream exhausts, yarn tension is easy to produce.Control unit CU detects the increase of tension force by tension pick-up 70, and with in order to regulate (in this case, little by little reducing) mode preloaded of spring 48 changes the position acting on the sliding part 50 on the second keep plate 40 via spring 48, and therefore braking action is applied to the yarn of advancing between the plates, compensates tension variation thus.

Fig. 5-8 shows alternate embodiment of the present invention, embodiment before this embodiment is different from the springs preload mechanism of active yarn brake 120.In this embodiment, the supporter be made up of annular revolving meber 150 is coupled to sleeve 142 slidably, and acts on spring 148.A part for the outer surface of revolving meber 150 is rack rails shape in 150a, and engages with the worm screw 151 of the axle being keyed onto stepper motor 154.Stepper motor 154 is fixed to support member 144 via connector 156, connector 156 from sleeve 142 away from the second keep plate 140 towards end extend integratedly.Total is encapsulated in housing 159.Revolving meber 150 rotates relative to sleeve 142 by stoping with the pin 157 of revolving meber 150 one, and engages the slit 159a be formed in housing 159 slidably.

Stepper motor 154 is driven in the mode of embodiment before being similar to by the control unit CU' being connected to tension pick-up 170.

Be described herein preferred embodiments more of the present invention, but those skilled in the art can certainly carry out many changes within the scope of the claims.Such as, replace linear step actuator or stepper motor, brushless drive system can be used.

Claims (8)

1. one kind for being arranged on the yarn arresting gear on yarn feeder (10), described yarn feeder (10) is provided with drum (12), described drum (12) has winding multiple yarn rings (Y) thereon, described yarn ring (Y) is suitable for untiing under the request of downstream machine, and described yarn arresting gear comprises:

-the first keep plate (32), described first keep plate (32) is suitable for the delivery end being fixed to described drum (12) coaxially, and

-the second keep plate (40), described second keep plate (40) is biased by elastic device (48) coaxially against described first keep plate (32), described elastic device (48) is operably bonded between described second keep plate (40) and supporter (50)

Described yarn (Y) is suitable for advancing between described keep plate (36,44), to receive the braking action by the friction preloaded according to described elastic device,

It is characterized in that, described supporter (50, 150) via for along in case change described in preload direction movement rotate to translation motion conversion equipment (58a, 64a, 150a, 151) motor (54 is operably connected to, 154), described motor (54, 154) by control unit (CU, CU') based on by tension pick-up (70 interactional with the yarn untied from described feeder, 170) signal produced drives, described control unit (CU, CU') be programmed for described in regulating in the mode in order to the tension force of described yarn (Y) roughly to be maintained constant at aspiration level and preload.

2. yarn arresting gear according to claim 1, it is characterized in that, described second keep plate (40,140) is directed to by tubulose outstanding (40d) and axially slides, described tubulose outstanding (40d) extends coaxially from its inner edge (40a), and is sliding engaged to the pilot sleeve (42,142) with described drum one.

3. yarn arresting gear according to claim 2, is characterized in that, described elastic device comprises the spiral compression spring (48,148) around described pilot sleeve (42,142).

4. the yarn arresting gear according to Claims 2 or 3, it is characterized in that, described supporter comprises sliding part (50), described sliding part (50) is around described pilot sleeve (42,142), and on guider (52) slidably, described guider (52) is spaced apart and parallel with described pilot sleeve (42).

5. yarn arresting gear according to any one of claim 1 to 4, it is characterized in that, described motor (54) and the described translation motion conversion equipment (58a, 64a) that rotates to are integrated in linear electrical actuator, and described linear electrical actuator is provided with the drive rod anchoring to described supporter (50).

6. yarn arresting gear according to claim 5, is characterized in that, described linear electrical actuator is linear step actuator.

7. the yarn arresting gear according to Claims 2 or 3, it is characterized in that, described supporter comprises annular revolving meber (150), described annular revolving meber (150) is coupled to described pilot sleeve (142) slidably, and it is characterized in that, the described translation motion conversion equipment that rotates to comprises rack rails (150a), described rack rails (150a) and described revolving meber one, and operably engage with the worm screw (151) of the driving shaft being keyed onto described motor (154).

8. yarn arresting gear according to claim 7, is characterized in that, described motor is stepper motor (154).