CN1986929A

CN1986929A - Improved weft stock detector for weft feeders

Info

Publication number: CN1986929A
Application number: CNA2006101711877A
Authority: CN
Inventors: Z·彼得罗; C·罗萨里奥
Original assignee: LGL Electronics SpA
Current assignee: LGL Electronics SpA
Priority date: 2005-12-22
Filing date: 2006-12-20
Publication date: 2007-06-27
Anticipated expiration: 2026-12-20
Also published as: CN1986929B; DE602006015277D1; ITTO20050893A1; EP1801273A2; EP1801273B1; EP1801273A3

Abstract

A detector exerts to a weft feed machine provided with a fixing drum (12) with a yarn coil winding on to form a weft storage (RT). Three detecting arms (22, 24, 26) hinge on the side of the drum coiling each axes (28, 30, 32) and lean on the drum by each contacting end (24a), so as to swing between a movable take-up position and a lower lay-up position relative to existence/loss of the coil on the drum. A photovoltaic element (42) setting to the movement of the detecting arm includes a luminescent diode (47) and a photodiode (50), the luminescent diode generates a photon stream through a lathy slot (48) extending racially, the photodiode is in the front of the slot (48). Each detecting arm has a baffle (52) which can be inserted between the luminescent diode and the photodiode and be defined by a straight line edge (54) in the front, when the detecting arm is in the lay-up position, the straight line edge aligns with the outside edge of the slot, so as to hide the slot.

Description

The improved weft stock detector that is used for the parallel feed machine

Technical field

The present invention relates to a kind of improved weft stock detector that is used for the parallel feed machine.

Background technology

As everyone knows, the parallel feed machine that is used for loom comprises a fixing drum, and an electronic turning arm twines a plurality of yarn coils to form a weft stock on this drum.Twine in case loom demand, yarn coil are removed from drum,, be fed to loom then by a guide eyelet.

Parallel feed machine for top type, weft stock on the drum is controlled by a weft stock detector, this weft stock detector generally includes two swing feeler arms, these two swing feeler arms are arranged on two bulging opposite ends and for example lean against partially by spring and/or by gravity and rouse, and one the 3rd swing feeler arm is arranged on a centre position, and the 3rd swing feeler arm has the effect of any fracture that detects yarn.Each feeler arm can towards a lower lay-down position of drum and the cocked position of an activity between swing, whether this relates in yarn coil that zone on drum and existing.Photoelectric cell detects moving of feeler arm, and connect and signal is delivered to a control module, this control module guides the rotation of turning arm based on the signal that receives, thus keep weft stock in the constraint that the position limited by the feeler arm of two outermosts, constant substantially on drum.

The detector of above type has shortcoming: they are inaccurate when detecting fine yarn usually, because in this case, mobile (vice versa) of feeler arm from moving position to lay-down position is very small, so that photoelectric cell can not detect.Therefore, these detection failure have influenced the reliability of weft stock detector.

Summary of the invention

Therefore, a main purpose of the present invention provides above weft stock detector, thereby even makes sensitive more and easily reaction aspect its minute movement that detects feeler arm under the situation of very thin yarn.

The above purpose that will better show below and other advantage, can realize by a kind of improved weft stock detector, this parallel feed machine provides a fixing drum, yarn coil is wound in this fixing drum and goes up to form a weft stock, this weft stock detector comprises: at least two feeler arms, each all is hinged on bulging next door around separately an axle, and lean against partially on the drum with its contact jaw separately, so that go up the existence/disappearance of coil and between the cocked position of an activity and a lower lay-down position, swing with respect to drum; And corresponding photoelectric cell, be arranged to detect moving of feeler arm, wherein, each described photoelectric cell comprises a light emitting diode and a photodiode, connect this light emitting diode and pass through an elongated slit to produce a photon stream, this slit extends along substantially radially the direction with respect to pin, this photodiode is in the front of slit, and each feeler arm provides a baffle plate, this baffle plate can insert between light emitting diode and the photodiode, and edge limited by a straight line in front, when feeler arm during at its lay-down position, this linear edge is aimed at the external margin of slit, thereby covers slit and interrupt photon stream.

And other advantage of the present invention and accidental quality are:

In above-mentioned weft stock detector, baffle plate is positioned on the opposite side with respect to contact jaw of axle.

In above-mentioned weft stock detector, feeler arm has a thrust on the opposite side with respect to contact jaw of axle, and this thrust is shaped as and is used for being adjacent to a fixing abut during at its lay-down position when feeler arm.

In above-mentioned weft stock detector, baffle plate is included in a thin projection that forms previously of thrust.

Description of drawings

Describe the present invention in more detail now with reference to one preferable, non-exclusive embodiment, this embodiment shows by non-limitative example in the accompanying drawings, wherein:

Fig. 1 provides a side view of a parallel feed machine of a with good grounds weft stock detector of the present invention;

Fig. 2 is the front view that amplifies the slightly parallel feed machine, relevant with the drum of this feed machine of Fig. 1;

Fig. 3 is the cutaway view of Fig. 2 III-III along the line;

Fig. 4,5 has significantly shown two kinds of different operating features of the details of Fig. 3 enlargedly;

Fig. 6 is the cutaway view of Fig. 5 VI-VI along the line;

Fig. 7 has shown the details of Fig. 5 enlargedly.

The specific embodiment

At first referring to Fig. 1, a parallel feed machine 10 that is used for loom comprises a fixing drum 12, fixedly drum 12 has longitudinal fluting 13 in its surface, a turning arm 14 that is driven by the motor 15 by a control module CU (in Fig. 3 only schematically show) guiding is wrapped in this fixedly on the drum 12, to form a parallel deposit or to store RT with a plurality of yarn coils.In case loom needs, yarn F removes from drum and twines, and by a guide eyelet 16, is fed to loom then, and this guide eyelet 16 is supported on the free end of a fixed arm 17, and this fixed arm 17 is outstanding from the motor housing that is parallel to bulging axis.Fixed arm 17 is also supported a weft stock detector 18, is used to control the parallel deposit on the drum.

Specifically referring to Fig. 2-7, weft stock detector 18 comprises a shell 20 now, and this shell 20 supports to be hinged to respectively three

feeler arms

22,24,26 of pin parallel to each other 28,30,32.Two 22,26 two end opposite of being arranged near drum in these feeler arms, and the 3rd feeler arm 24 is arranged on a centre position.Now specifically referring to Fig. 2,4-7, in these figure, shown outermost feeler arm 26 in detail, each feeler arm all comprises a U-shaped Metallic rod 34 (Fig. 2), and its free end is attached to and a lining 38 forms a whole grappling body 36, and this lining 38 is hinged in all pins 32 corresponding one.The terminal 34a of the bending of U-shaped part moves towards an angle with respect to two parallel branches along yarn, and lean against partially on the drum 12 by the magnetic action of the mutual repulsion between the first permanent magnet 39a and the second fixed magnet 39b, this first permanent magnet 39a combines a thrust 40 of giving prominence to from lining 38 on the opposite side of pin, this second permanent magnet 39b has identical polar, and is supported on the first magnet 39a front.Each feeler arm all can be swung between the moving position that a lower lay-down position and lifts, and does not have yarn coil to be wrapped on the drum when lay-down position in the zone that knee-joint closes, and yarn coil is arranged when moving position.At lay-down position (Fig. 5), the curved end of feeler arm or contact jaw 34a are received among of longitudinal fluting 13 on the drum, and the free end 40a of thrust 40 is adjacent to and shell 20 forms a whole abut 41.At moving position (Fig. 4), in the feeler arm lower zone, be wrapped in yarn coil on the drum 12 and cause that arm is picked up from its lay-down position.

One photoelectric cell 42 is attached to shell 20 above lining 38, be used to detect moving of feeler arm.Photoelectric cell 42 is shaped as an inverted U-shaped, have two relative vertical walls 44,46 (Fig. 6), these two walls hold a light emitting diode 47 and a photodiode 50 respectively, this light emitting diode 47 is connected to a power supply AL (only signal shows in Fig. 6), and produce a photon stream and vertical slot 48 (Fig. 4,7) by a narrow straight line, this photodiode 50 is arranged on the front of slit 48, and is connected to control module CU.Between two walls, define a gap, one thin projection 52 is inserted wherein, this thin projection 52 forms in the front of thrust 40, and limited by a straight line edge 54, radially extend this linear edge 54 position that (Fig. 7) aims at the external vertical edge (right hand edge among the figure) of slit 48 from lining 38, when shelving with a feeler arm.Therefore, thin projection 52 defines a baffle plate, and when feeler arm was shelved, this baffle plate was covered slit 48 and interrupted photon stream.Photoelectric cell 42 is connected to control module CU, thereby position signalling is sent to control module CU, thereby to this control module CU programme the guiding turning arm 14 rotate based on the signal that receives, thereby weft stock RT keeps constant substantially in by the restriction that the position limited of two outermost end feeler

arms

22,26 by this way.Middle feeler arm 24 is intended to detect any fracture of yarn.The programming of control module CU because it belongs to those of ordinary skills' general knowledge, therefore will not provide further description not within the scope of the invention.Photoelectric cell 46 is anchored into the upside of shell 20 by a U-shaped anchoring element 56, and this U-shaped anchoring element 56 also limits above-mentioned abut 41, and when feeler arm during at its lay-down position, the free end 40a of thrust 40 is adjacent to this abut 41.One magnetic sensor 58 is installed on the shell 20, and is arranged to detect moving of the first magnet 39a that is installed on the feeler arm.Magnetic sensor 58 also is connected to control module CU, thereby the delivering position signal is to control module CU, thereby and can be adjusted with photoelectric cell and cooperate, for example be used to provide two follow-up position signallings that relate to the feeler arm position, perhaps be used to implement other combination or selectable detection, can be easy to find such as those of ordinary skills.

In running,

feeler arm

22,24,26 is setovered by gravity or by the mutual repulsion between two magnet 39a, the 39b, and has a level type effect that centers on by a fulcrum that is limited of pin, and can swing between lower lay-down position and the moving position that lifts, these two positions relate to disappearance/existence that drum is gone up coil.Fig. 4,5 shown respectively a moving position with a lay-down position with the relevant weft stock detector of a fine yarn FS.As shown in Figure 4, because according to the abovementioned embodiments of the present invention, feeler arm is enough to make very small moving from its lay-down position, such as determined mobile by the very thin yarn of a circle, thereby causes that projection 52 breaks away from slit 48 immediately fully.Will understand immediately in those of ordinary skill as ability, this situation makes weft stock detector detecting sensitive more and easily reaction aspect very small mobile of feeler arm, even under the situation of very thin yarn.

Described a preferred embodiment of the present invention at this, still, those of ordinary skill in the art can make many changes in the scope of the inventive concept certainly.Especially, feeler arm can be except the bias unit by magnet, also can be for example by spring or only lean against partially on the drum by gravity.In addition, the existence of sensor-magnet 58 will be useful, but be not to realize that the present invention is necessary.

Claims

1. weft stock detector that is used for the parallel feed machine, this parallel feed machine are provided with a fixing drum (12), and yarn coil is wound in this fixing drum and goes up to form a weft stock (RT), and described weft stock detector comprises:

At least two feeler arms (22,24,26), each all is hinged on the next door of described drum around separately an axle (28,30,32), and lean against partially on the described drum with its contact jaw (34a) separately, so that with respect to the existence/disappearance of coil on the described drum and between the cocked position of an activity and a lower lay-down position, swing, and

Corresponding photoelectric cell (42) is arranged to detect moving of described feeler arm,

It is characterized in that, each described photoelectric cell comprises a light emitting diode (47) and a photodiode (50), connect this light emitting diode and pass through an elongated slit (48) to produce a photon stream, this slit extends along substantially radially the direction with respect to pin (32), this photodiode is in the front of described slit (48), and each described feeler arm provides a baffle plate (52), this baffle plate can insert between described light emitting diode and the described photodiode, and limit by a straight line edge (54) in front, when described feeler arm during at its lay-down position, this linear edge is aimed at the external margin of described slit (48), thereby covers described slit (48) and interrupt described photon stream.

2. weft stock detector as claimed in claim 1 is characterized in that, described baffle plate (52) is positioned on the opposite side with respect to described contact jaw (34a) of described axle (32).

3. weft stock detector as claimed in claim 1 or 2, it is characterized in that, described feeler arm has a thrust (40) on the opposite side with respect to described contact jaw (34a) of described axle (32), this thrust is shaped as and is used for being adjacent to a fixing abut (41) during at its lay-down position when described feeler arm.

4. weft stock detector as claimed in claim 3 is characterized in that, described baffle plate (52) is included in a thin projection (52) that forms previously of described thrust (40).