EP1040069B1 - Thread delivery device - Google Patents

Description

The invention relates to a thread delivery device which in the preamble of claim 1 specified type.

In the sensor device of a known thread delivery device (Manual IWF 90 08, IWF 91 07, IWF 92 07, from IRO AB, No. 07-8930-0812-01 / 9647, pp. 10, 43, 44, 50, 51 and 53) two sensor arms are arranged one above the other such that the sensor feet the thread supply on two in the feed direction of the thread turns on the storage drum Scan consecutive places for presence or absence. Everyone Sensor arm is a two-legged wire bracket and has its own swivel axis, which carries an arm that extends the sensor arm to the opposite side. This arm engages in the scanning device in which an optoelectronic detector is provided. A spiral spring is anchored to the scanning device, each Sensor arm acted in such a way that the sensor foot is blasted to the basic position. The Sensor device contains many individual parts, requires special care and specialist knowledge when setting, and shows under difficult operating conditions restless response.

The invention has for its object a yarn delivery device of the aforementioned Type to create, which is characterized by a compact sensor device with a precise and insensitive responsiveness.

The object is achieved according to the invention with the features of the patent claim 1 solved.

The projection covers the scanning distance not only by one-way movement from one side, but the projection also works with the Cover area together, that the scanning distance first from the cover area the side opposite the penetration side of the projection into the scanning path is exactly limited, and when the projection passes through the scanning path finally the overlap between the cover edge and the cover surface is established is that a quick and complete coverage of the scanning distance with a sharp transition. The scanning path is, so to speak, two opposite ones Sides narrowed here (in the manner of a slit diaphragm) and ultimately completely interrupted. It is structurally simply a clean signal transition Scanning device achieved when the cover edge overlaps the cover surface and reliably interrupts the scanning path. Cooperation between the cover edge and the cover surface creates just in an optoelectronic scanning device a quick transition between full shade and anything no shadowing of a beam path, which simplifies signal evaluation and the electronic effort required for signal evaluation can be reduced. The overlap is also favorable for other scanning systems because of the covering area and the cover edge form aperture-like boundaries of the scanning path and act together like scissors.

According to claim 2, the flag is an actuator of the scanning device in the sensor arm or integrated sensor arm part. It can perform an additional function if it determines the end position with the stop. The stroke shapes simple at the same time on the cover surface.

According to claim 3, the overlap is narrow transversely to the direction of the sensor arm Space. The flag serves as a carrier of the lead and assists the coverage of the scanning distance.

According to claim 4, the scanning distance is particularly simple and effectively limited and blocked.

For scanning is preferred according to claim 5 in a fork-shaped holder housed optodetector used, which is inexpensive with high operational reliability is and works precisely. The optodetector can be placed protected. The However, optodetector is only one way of tapping the movements of the Feeler. It could also be an inductive, an electrical, or an electromagnetic or a pneumatic detector can be used. Output signals from the scanner are expedient for controlling the drive of the thread delivery device or for error monitoring of the thread delivery device or a thread processing system used to which the thread delivery device belongs. The bracket of the Optodetector can be arranged on a circuit board in the sensor housing, the PCB acts as a cover inside the sensor housing to the outside. Possibly even forms a stroke limiter for the sensor arm. One for the feeler foot The passage opening provided can be small, so that dirt can hardly penetrate or simple measures are sufficient to prevent the ingress of dirt to avoid reliably.

According to claim 6 is the stroke of the sensor arm limiting stop on Housing part of the thread delivery device arranged, preferably in one piece with this, which simplifies manufacturing.

According to claim 7 structurally simple the creation of harmful parasitic vibrations avoided, which could influence the response behavior. The spring element has the task of loading regardless of the installation position of the thread delivery device to generate the sensor arm to the basic position, and in addition the emergence of swinging movements of the sensor arm under unfavorable operating conditions steam, if necessary as soon as they arise. This is achieved through a spring hardening in a movement range of the sensor arm into which he can get due to his work dynamics. The forced Damping prevents an undesirable rocking effect without the work of the Affect sensor arms. Conversely, damping improves correct working of the feeler arm when sensing the presence or absence of the thread.

According to claim 8, the suspension of the sensor arm and the aforementioned Damping accomplished in a structurally simple manner.

According to claim 9, the response behavior of the sensor device is improved, if the guide arm is in the stationary guide fork in unfavorable operating conditions guided or at least supported against lateral evasive movements becomes. Lateral vibrations of the guide arm can already be created dampen.

When according to claim 10, the scanning device and the spring arrangement on the same Side of the bearing are integrated in the sensor housing, like the sensor foot supporting feeler arm part, becomes significant in the direction of the axis of the storage drum Construction space saved. Furthermore, the number of necessary individual parts of the Sensor device noticeable. There is also installation space transverse to the axis of the storage drum saved because the individual cooperating parts are arranged close to each other can be. This is advantageous if the sensor device has multiple sensor arms Is provided. Thanks to the compact arrangement, harmful vibrations avoided, so that a sensitive response can be achieved.

The number of individual parts can be reduced in a small installation space, if each probe arm part directly with its scanning device and the spring arrangement interacts, i.e. without additional, motion-transmitting accessories.

Alternatively, according to claim 12, the scanning device facing away from the sensor base Side of the bearing can be arranged, the sensor arms accordingly extended beyond storage to the other side. The scanner can then expediently on a control board of a drive of the thread delivery device to be assembled. It is true in the direction of the axis of the storage drum takes up more space; however, the scanner can then be influenced by Better remove dirt or lint.

According to claim 13, a weight balance for the Sensor arm achieved. If necessary, it can be very wear-resistant, but something use heavier, feeler feet without problems, without undesirably high mechanical To generate loads on the thread.

According to claim 14, the sensor arm part is already with the flag and the stop for prepared the cooperation with the cover device and the spring arrangement. This has manufacturing advantages.

According to claim 15 are in a sensor device with multiple sensor arms the number of individual parts and the installation space are reduced if all sensor arms have a common one Have axis, and the spring elements or that acting on all sensor arms Spring element is housed to save space. It is important when the switching device for damping has no other components because that Spring element is used for the damping function, which also loads the Sensor arm serves for the basic position. A common axis for several sensor arms jst useful regardless of where the scanning device and / or the damping device are arranged with respect to the axis.

Fig. 1

eine schematische und perspektivische Teilschnittansicht von Hauptkomponenten eines Fadenliefergeräts,

Fig. 2

eine perspektivische Teilschnittdarstellung ähnlich der von Fig. 1 in vergrößertem Maßstab,

Fig. 3

einige Komponenten aus den Fig. 1 und 2 in perspektivischer Darstellung und herausgelöst aus dem Gesamtverbund,

Fig. 4

einen Querschnitt eines Details in einer Endstellung eines Fühlerarmteils,

Fig. 5

einen Querschnitt entsprechend Fig. 4, in einer anderen Stellung des Fühlerarmteils, und

Fig. 6

eine perspektivische Teilschnittdarstellung ähnlich der von Fig. 2 bei einer weiteren Ausführungsform.

Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:

Fig. 1

1 shows a schematic and perspective partial sectional view of main components of a thread delivery device,

Fig. 2

2 shows a perspective partial sectional illustration similar to that of FIG. 1 on an enlarged scale,

Fig. 3

some components from FIGS. 1 and 2 in a perspective view and detached from the overall composite,

Fig. 4

2 shows a cross section of a detail in an end position of a sensor arm part,

Fig. 5

a cross section corresponding to FIG. 4, in a different position of the sensor arm part, and

Fig. 6

a perspective partial sectional view similar to that of FIG. 2 in a further embodiment.

In Fig. 1 is from a yarn delivery device F (weft delivery device for a weaving machine) a winding element 1 shown in a storage drum 2, which one a housing or a housing bracket 4 attached sensor device S assigned. In the exemplary embodiment, three sensor arms A are provided, which are extend parallel to each other in the direction of the axis of the storage drum 2 and one yarn supply V consisting of turns of a yarn Y on the storage drum 2 monitor. The thread supply V is a relative rotary movement between the winding element 1 and the storage drum 2 (in the present case a stationary storage drum 2) with an axial size, which regulates is emptying despite continuous or intermittent thread consumption or to avoid overfilling the storage drum 2. The thread supply V spills over a longitudinal recess 3 in the storage drum 2. On the recess 3rd are feeler feet 8a to 8c aligned, each of which is under spring force in a basic position is durable, in which he engages in the recess 3 and on which he through the thread supply V can be shifted upwards. The left foot 8a in FIG Thread break guard should be included, which responds as soon as the first turns of the thread supply V fail to appear. The sensor base 8b can belong to a minimal sensor, which monitors the minimum permissible size of the thread supply V and in the absence the thread supply V activates the drive of the winding element 1 in this area, to supplement the thread supply V. The feeler foot 8c belongs to one, for example the so-called maximum sensor, which when shifting from that shown in FIG. 1 Home position switches off or delays the drive of the winding element 1 because the permissible maximum size of the thread supply V has been reached.

In Fig. 1, each sensor arm A consists of a sensor arm part 7a to 7c and the sensor foot 8a to 8c. These components can be manufactured separately and together be connected. All sensor arms A are on a common axis 5 in one Sensor housing 6 mounted, the axis 5 being approximately transverse to the direction of Axis of the storage drum 2 extends. Alternatively, it would be possible to have axis 5 parallel arrange to the axis of the storage drum 2, and the sensor arms A transverse to the axis to orient the storage drum 2.

In the sensor housing 6, a spring arrangement B is provided, which is a switching device D is assigned. The sensor housing 6 is, for example, in the arm 4 of the thread delivery device housing integrated. Each sensor arm A is non-contact Assigned scanning device T, which depends on the pivoting position of the sensor arm generates a signal for an associated monitoring or control device. The scanning device T can be an optoelectronic, electrical, electronic or electromagnetic detector.

The spring arrangement B and the scanning device T are the same in FIGS. 1 to 3 Side of the axis 5 arranged like the feeler arm parts carrying the feeler feet 8a to 8c 7a to 7c. The scanning devices T are below and the spring arrangement T above the sensor arm parts 7a to 7c.

The enlarged representation of the sensor device S in FIG. 2 shows that each sensor arm part 7a to 7c is a molded part, e.g. made of plastic (injection molded part), is in which a jack 9 for the sensor base 8a to 8c, a stop 14 for the Spring arrangement B and a flag 13 for the scanning device T structurally integrated are.

In this connection it should be noted that the sensor device S more or less than the three sensor arms A shown.

The sensor feet 8a to 8c are identical in the embodiment shown. Everyone Feet base 8a to 8c is, for example, a molded metal part, e.g. a die cast part or out Spring steel wire bent, with a toe defining a continuous surface 10 and two approximately parallel and spaced legs 11, one of which a leg 11 is inserted into the respective jack 9 of a sensor arm part 7a to 7c and, if necessary, secured in position by means of a securing element 20 is. The other leg 11 ends freely or is of the required length shortened. The width of each sensor foot 8a to 8c is larger than the distance between adjacent sensor arm parts 7a to 7c, made possible by a lateral displacement the jack 9 on the sensor arm part 7b. If necessary, the jacks 9 adjustable on the feeler arm parts 7a to 7c in the longitudinal direction thereof to be able to adjust the relative positions of the sensor feet 8a to 8c.

A stationary guide fork 12 can be assigned to each sensor arm part 7a to 7c be between the teeth of the sensor arm part 7a to 7c out or at least lateral evasion is prevented. The stops 14 on the feeler arm parts 7a to 7c are at the same distance from the axis 5 and bear on the top rounded surfaces 15 which on spring elements 16a to 16c of the spring arrangement B rest around each sensor foot 8a to 8c in its basic position (see the right one in FIG. 2 Feeler foot 8c) to keep resilient until he is by the rear force of the Thread Y is shifted from the basic position. The spring elements shown in Fig. 2 16a to 16c expediently belong to a single spring element which at 17 is anchored in the sensor housing. The spring elements 16a to 16c are flexible springs, expediently leaf springs that project freely. The switching device D contains for each spring element 16a to 16c an expediently adjustable damping extension 18, e.g. a set screw that is accessible from outside the sensor housing 6 and on a contact area 19 with the associated spring element 16a up to 16c. Within the normal working cycle of the sensor feet 8a to 8c, the spring elements 16a to 16c do not necessarily come into contact with the damping extension 18. Only when a larger stroke of the sensor arm due to the dynamics A should occur, its spring element 16a to 16c comes against the damping extension 18. Since its contact area 19, for example at that of the anchoring 17 faces away from the surface 15, the spring element 16a to 16b hardens clearly dampened by the swinging movement of the sensor arm A and this in his normal working area is pushed back.

The scanning devices T are arranged on a circuit board, for example Has through openings 32 for the legs 11 of the sensor feet 8a to 8c and Conductor tracks and possibly other electronic or electrical components wearing.

In Fig. 3 is a cut end 21 of a leg 11 of a feeler foot 8c indicated. This cut end 21 could be used when planted on the underside of the board P an upward stroke limitation for the assigned one Form sensor arm A. Furthermore, it can be seen in Fig. 8 that each flag 13 on the underside of the sensor arm part 7a to 7c is formed and corresponding to FIGS. 4 and 5 serves, among other things, the basic position of each sensor arm part 7a to 7c in cooperation limit with a stationary stop 30.

4 and 5, an optoelectronic detector of the scanning device T is formed of an emitter E and a receiver R aligned thereon, between which a beam path 23 is present as a scanning path. The scanning device T is in a For example, integrated on the board B, fork-shaped bracket 24 integrated. The Bracket has a mouth-shaped recess 25 for the flag 13, for example the Feeler arm part 7a. At the bottom of the recess 25, the stop 30 is formed by an insert 26. in the insert 26 a recess 27 is provided on both sides is limited by cover surfaces 29 and one on the underside of the flag 13 provided projection 28 allows in the position shown in Fig. 4 in the recess immerse. This position is defined by laying the lower side the flag 13 on the stop 30. In this position, one overlaps at the projection 28 provided, transversely to the beam path 23 covering edge 31 with the Cover surfaces 29 in order to reliably shade the beam path 23. However, is when the sensor foot 8a is shifted upwards, the sensor portion 7a against the force a spring element 17a raised until the projection 28 out of the recess 27 emerged and the overlap between the cover edge 31 and the cover surfaces 29 is canceled, then the beam path 23 is continuous. Depending on the design the scanning device T is either in the position shown in FIG. 4 or in the 5 generates a signal that the control or monitoring device registered and evaluated. The mechanical overlap between the Cover edge 31 and the cover surface 29 leads to a rapid transition between full shadowing of the beam path 23 and full release of the beam path 23, whereby there is a strong signal transition and the scanning device T responds within a small stroke of the sensor arm part 7a.

In Fig. 6, the sensor arms A are beyond the common axis 5 with sensor arm parts 7a ', 7b', 7c 'and the scanning device T is on the sensor feet 8a, 8b, 8c side of the axis 5 facing away, e.g. in a board P ' the drive control of the thread delivery device F containing section 6 of the boom 4. The brackets 24 of the scanning device T can be arranged on this board P. his. The stops 30 for the flags 13 on the sensor arm parts 7a 'to 7c' are formed by projections 33 which penetrate the board P 'and expedient are integrally formed with the section 6 ', which belongs to the boom 4. The sensor arm parts 7a 'to 7c' can be designed as ballast masses G or (as shown) Have ballast mass G. Although not highlighted in Fig. 6, it works each flag 13 analogous to FIGS. 4 and 5 with a projection 28 and at least a cover edge 31 overlapping with at least one formed by the stop 30 Cover surface 29 together when the beam path 23 is shadowed. The switching device D has permanently installed damping extensions 18 in FIG. 6. The Preload of the spring arrangement B anchored at 17 can be adjusted centrally by means of an adjusting screw 34 which, for example, is arranged in the sensor housing 6. The sensor housing 6 is housed in the boom 4.

Claims (14)

1. Yam processing device (F) comprising a storage drum (2) for a yam store (V) consisting of windings of a yam (Y), a sensor device (S) provided within a sensor housing (6) outside of storage drum (2), said sensor device including at least one feeler arm (A) which is moveable on a support (5) and extends by a feeler arm portion (7a to 7c) carrying a feeler foot (8a to 8c) from said support (5) into the movement path of the windings along said storage drum, said feeler foot (8a to 8c) being arranged to be displaced by said windings from a home position, a spring assembly (B) loading said feeler arm in one movement direction, and a signal generating, contactlessly operating detecting device (T) scanning the initial position of said feeler arm which depending on the feeler arm position clears or interrupts a detection trajectory (23) of said detection device (T) characterised in that a projection (13, 28) including a covering edge (31) is provided on said feeler arm (A), that said projection (13, 28) is moveable by said feeler arm (A) through said detection trajectory (23), and that a covering surface (29) for said projection (13, 28) is provided stationarily adjacent to said detecting trajectory (23) and at a side of the movement path of said projection (28), such that said covering edge (31) and said covering surface (31) can be brought crosswise to said detection trajectory (23) into an initial overlap position.
2. Yam feeding device as in claim 1, characterised in that said projection (28) is carried by a flag (13) provided at said feeler arm (A) or a feeler arm portion (7a to 7c, 7a' to 7c'), respectively, for covering said detecting trajectory (23), and that said feeler arm (A) or the flag (13), respectively, can be seated on a stop (30) which defines a feeler arm end position and which is provided with said covering surface (29).
3. Yam feeding device as in claim 2, characterised in that a dive-in recess (27) for receiving said projection (28) is provided within stop (30), and that said dive-in recess (27) forms two opposite covering surfaces (29).
4. Yarn feeding device as in claim 2, characterised in that said stop (30) is an insert (26) inserted into a fork-shaped opto-detector holder (24), said detection trajectory (23) being a beam trajectory which can be shadowed.
5. Yarn feeding device as in claim 2, characterised in that said stop (30') is a projection (33) protruding from a housing part (4) of said yam feeding device (F), said projection comprising said covering surface (29) forming recess (27) for receiving said projection (28), said projection (33) preferably being unitary with said housing part (4).
6. Yam feeding device as in claim 1, characterised in that said spring assembly (B) includes a spring element (16a to 16c) and a spring stroke depending switch-over device (D) allowing to adjust an increase of the spring force or an increase of the hardness of spring element (16a to 16c) as soon as a predetermined moving stroke of said feeler (A) out of its home position has occurred.
7. Yam feeding device as in claim 6, characterised in that said spring element (16a to 16c) is a cantilevered bending leaf spring permanently loading said feeler arm (A), and that at the side of said spring element opposite to said feeler arm a dampening boss (18) is aligned with said spring element, said dampening boss (18) constituting said switch-over device (D), and that a contact spot (19) between said dampening boss (18) and said spring element is offset to a contact spot between said feeler arm at said spring element in longitudinal direction of said spring element.
8. Yam feeding device as in claim 1, characterised in that a stationary guiding form (12) is provided for each feeler arm (A), the fork tines of which guide said feeler arm (A) in its motion direction into and out of said home position.
9. Yarn feeding device as in claim 1, characterised in that said spring assembly (B) and said detecting device (T) are provided at the same side of said support (5) like said feeler arm portion (7a to 7c) carrying said feeler foot (8a to 8c).
10. Yam feeding device as in claim 9, characterised in that within the motion path of said feeler arm said detecting device (T) and said spring assembly (B) are arranged at opposite sides of said feeler arm.
11. Yarn feeding device as in claim 1, characterised in that said detecting device (T) is arranged at the side of the support (5) opposite to said feeler foot (8a to 8c), preferably at a control circuit board (P) of a drive of the yam feeding device (F), and that said feeler arm (A) by its feeler arm portion (7a', 7b', 7c') carrying said flag (13) and said projection (28) extends from said support (5) towards said detecting device (T).
12. Yam feeding device as in claim 11, characterised in that said feeler arm portion (7a' to 7c') is formed as a balancing mass (G) or is equipped with a balancing mass (G).
13. Yam feeding device as in claim 2, characterised in that said flag (13) and a stop (14) for said spring assembly (B) are provided at said feeler arm portion (7a to 7c).
14. Yarn feeding device as in claim 1, characterised in that said sensor device (S) includes at least two, preferably three, adjacently arranged feeler arms (A) with feeler arm portions (7a to 7c, 7a' to 7c') of different lengths, which are supported on a common axis (5), and that said spring assembly (B) includes single spring elements (16a to 16c) corresponding in their number to the number of feeler arms (A), or includes a single spring element commonly actuating all feeler arms.

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