CN1730753B - Pick storer used for weaving machine equipped with self-controlled arresting device - Google Patents

Abstract

The feeder comprises a stationary drum (12) on which are wound loops of yam to be fed to a downstream textile machine, and a self-governing braking device comprising a hollow, frustoconical braking member (16) which is arranged in front of the drum (12) and is supported at the middle of a spider assembly of springs (18) hooked between the braking member (16) and an annular support (19). The springs (18) have a length at rest which is equal to, or higher than, the span between their hooking point on the frustoconical member (16) and their hooking point on the annular support (19). The annular support (19) is slidably supported with respect to the drum (12) along an axial direction, under control of driving means (22), for biasing the frustoconical member (16) against said edge (12r), thereby causing the frustoconical member to align to the drum, while approaching thereto, by geometrical engagement.

Description

Be used to be equipped with the weft feeder that nonstick system of control moves the loom of device

Technical field

The present invention relates to a kind of weft feeder that a nonstick system of control moves the loom of device that is used to be equipped with.

Background technology

The general latitude feeder that is used for loom comprises a fixing cylinder of a plurality of yarn coils of electronic weft yarn spare unit of turning arm coiling formation thereon.When yarn unwinding from cylinder is prevented by the brake apparatus of a kind of automatic control of pattern described in the IT-U-1 251 209 when presenting to loom.This device comprises a conical butt brake component, and this brake component rouses coaxial with volume and flexibly setovered by means of a discharging edge of cutting sth. askew of this volume drum of its interior face.This brake component is supported in the middle part of a spoke dish of the spiral spring draw ring that is contained on certain support, and this support is axially movably to go up the static pressure that the conical butt brake component applies so that regulate by static volume drum.In this operation, yarn dances in the air between volume drum and brake component, and the axial members of feasible its tension force that is directly proportional with yarn speed is applied on this brake component.So when speed increased, brake component left from rolling up on the drum vertically along with the automatic reduction of braking action.

With regard to above-mentioned brake apparatus, when the faint braking action of needs, promptly when low static pressure is put on the volume drum by cone, be difficult to obtain yarn and go up accurate and regular unwinding from rolling up drum, because this situation can cause the centering problem, this is known for being familiar with those skilled in the art.

In addition, for modern loom, under from 0 to 2500 meter/minute situation about quickening rapidly, yarn speed can reach high value.Under this operating condition, from viewpoint with the peak value of yarn speed feedback, above-mentioned brake apparatus is unsafty, because this cone should as far as possible promptly move apart when the latter quickens, so that make braking action be adapted to new yarn speed.

Summary of the invention

Therefore, a main target of the present invention is to provide a kind of weft feeder with brake apparatus of a kind of improved automatic control for loom, even utilize this brake apparatus under the situation of faint braking action by means of the reaction more rapidly that yarn is quickened, yarn is with than higher precision with regularly go up unwinding from rolling up drum.

Above purpose and other target and advantage can more clearly be seen as following, be to utilize a kind of weft feeder with the characteristic described in the claim 1 to realize, but other claim have illustrated other advantage, although be less important characteristic.

Description of drawings

With reference now to the accompanying drawing of representing by non-limiting instance, the present invention more at large is described, wherein:

Fig. 1 is a kind of side view of equipping the weft feeder of the moving device of a kind of nonstick system of control according to the present invention in the first time in the operative configuration;

Fig. 2 is the front view according to the moving device of nonstick system of control of the present invention;

The side view of the weft feeder that Fig. 3 is Fig. 1 in second time operative configuration;

The side view of the weft feeder that Fig. 4 is Fig. 1 in operative configuration for the third time;

Fig. 5 is similar to Fig. 2, a view of expression another alternative specific embodiment of the present invention.

Specific implementation method

With reference to above each figure, weft feeder 10 has a motor field frame 11 that supports fixing volume drum 12 coaxially, and a plurality of yarn coil (not shown) of electronic turning arm 13 coilings form weft yarn spare unit on the volume drum.When loom required, yarn was through rousing a coaxial thread-carrier aperture 14 from rolling up unwinding on the drum 12 with volume.

From rolling up the tension force that rouses the yarn of going up unwinding is to utilize one to comprise a unwinding of adjusting by means of the brake apparatus of the conical butt brake component 16 of its great circle layout in the front, end of volume drum 12, rolls up drum and is equipped with a discharging edge 125 of cutting sth. askew.

Conical butt brake component 16 is supported in the middle part of a spoke dish assembly (spiderassembly) of all spiral springs 18, these spiral springs 18 its less circumference place with they each the end in an end hook in brake component 16, and with an opposite end hook in a ring support 19.

According to the present invention, the length of spring 18 when static be equal to or higher than on their frustoconical member 16 hook a little and their ring support 19 on hook a little between spacing, that is:

$L\≥\frac{D2-D1}{2}$

L is the length of spring when static in the formula, and D1 is used for spring to hook diameter on brake component 16, and D2 then is that spring hooks diameter (hooking diameter) on ring support 19.

Ring support 19 is installed on the slide block 20, and this slide block can be bearing on the fixed arm 21 of forming with motor field frame 11 under the control by a button 22 exercisable helical gears (screw gear) (not shown) vertically slidably.Button 22 is exercisable, so that regulate the static pressure that is applied by the conical butt brake component on the volume drum.

As shown in Figure 1, when frustoconical member 16 was static, it will be tiltedly facing to fixing volume drum 16 recumbencies.By action button 22, frustoconical member 16 moves towards volume drum 12, and geometry ground be engaged in sending edge 12r and need not making spring stretching, extension of cutting sth. askew, thereby reach accurate centering.In other words, for the improved brake apparatus according to the present invention, spring 18 just is used for the effect of hooking device of brake component 16, and does not influence centering.

In the operative configuration of Fig. 3, volume drum is extremely low with the pressure that contacts between the frustoconical member, because in fact spring loosens.Even the configuration in this neutrality of operating process medi-spring makes that the frustum of a cone member also can be accurately in alignment with the volume drum under the situation of extremely faint braking action.

In order to obtain stronger braking action, operate this button further to hold spring, as shown in Figure 4.

Figure 5 illustrates a kind of alternative specific embodiments of the invention, wherein the elastic threads with certain synthetic material 118 has replaced spring, the length of elastic threads when static is equal to or greater than them hooking a little and their distances between the hook point on the ring support 19 on the frustoconical member 16, and is similar with the specific embodiment of front.

Even brake apparatus according to the present invention still has high reactivity when yarn reaches its velocity peak values, because spring assembly is converted into a kind of stretching, extension situation from a kind of release situation, and the formation of air ring---when yarn is easy to form air ring from rolling up when drum is gone up unwinding---also is controlled.

Preferred embodiment of the present invention has been described herein, certainly, can in the scope of the present invention's design, have made many improvement by being familiar with those skilled in the art.

Claims (3)

1. weft feeder that is used for loom, it comprises: one has the fixedly volume drum (12) of sending edge (12r), is wound with the yarn coil for the treatment of to be fed to a downstream weaving loom on this volume is bulging; And, the moving device of nonstick system of control, it comprises hollow, a conical butt brake component (16), this brake component is disposed in the middle part of a spoke dish assembly of the flexible member (18) of rolling up the front of rousing (12) and being supported in a plurality of elongations with its bigger circumference, all flexible members with their end hook in brake component (16), an opposite end hook of using them simultaneously is characterized in that in a ring support (19):

A static length of described flexible member (18) be equal to or greater than they on the frustoconical member (16) hook a little and they on the ring support (19) hook a little between distance, that is:

$L\≥\frac{D2-D1}{2}$

In the formula, L is the static length of flexible member, and D1 is that flexible member hooks diameter on brake component (16), and D2 then is that flexible member hooks diameter on ring support (19); And under the control of drive unit (22), described ring support (19) can be supported slidably with respect to volume drum (12) vertically, so that be offset this frustoconical member (16) facing to described edge (12r), thus to this place near the time engage by geometry and to make that frustoconical member and volume drum are paired.

2. weft feeder as claimed in claim 1 is characterized in that, described flexible member is spiral spring (18).

3. weft feeder as claimed in claim 1 is characterized in that, described flexible member is a kind of elastic threads (118) of synthetic material.

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