CN1788116B - Monitor for monitoring yarn spool changes in yarn handling systems - Google Patents

Abstract

The invention relates to a detector (D) for detecting when the thread bobbin in a thread-processing system (S) has to be replaced. Said detector comprises a movably received element (E), at least one detection member (7) that responds to a relative position or a relative position change of the element with a signal (i), and a power generator that exerts a force on the element, and the element (E) can be adjusted during the replacement. The force is oriented in the direction of movement of the element (E) towards the detection position (P). The positioning device is provided with a thread clamping area (6, 6') that is arranged relative to the path of travel of the element in such a manner that the positioned thread (Y), until the replacement, forms a barrier for the element (E) against a movement towards the detection position (P) in response to the exerted force. The thread, during replacement, becomes detached in such a manner that the element (E) automatically moves towards the detection position (P).

Description

Monitor for monitoring yarn spool changes in yarn handling systems

technical field

The invention relates to a monitor for monitoring yarn spool changes in a yarn processing system, said monitor being provided with a movable support element which can be moved between a loading position and a movement between monitoring positions, a yarn positioning device for positioning the yarn within said monitor until the bobbin change occurs, a monitoring element, which responds via a signal within the movement path of the element In response to a relative position of the element or a change in the relative position, and a pressure generator, the pressure generator exerts pressure on the element in the direction of movement of the element.

Background technique

The monitor described in patent EP 0454199A has an asymmetric, pivotable, angled support rod with two arms. Due to the asymmetrical design, a pressure generator is integrated in the rod for generating the pressure which brings an arm of which an element is formed into the loaded position and holds the arm in the loaded position. The positioning yarn is located in a receptacle behind the arm so that the opening of the receptacle is blocked by the arm. During the bobbin change, the yarn is pulled out of the opening so that the yarn displaces the arm into the monitoring position and the yarn is released. When the monitoring position is reached, the angled lever actuates a switch. The switch sends the signal in response to a spool change that occurs. An auxiliary device securely holds the shaft rotating the angled rod so that the arm again blocks the opening of the receptacle. When loading the monitor, the angled rod is rotated by the arm by the yarn shaft until the yarn again reaches a position behind the arm and until the angled rod enters the loading position again. Because during the spool change, the yarn must overcome the pressure on the angled rod and in some cases deflect significantly, a considerable tension peak is generated in the yarn, which may be the reason for the Causes of yarn damage.

Also, in practice, one such photodetector has disc gates on both sides of an opening at one end. The disc gate and the opening form a yarn positioning device. The disc gate is arranged relative to a light blocking plate passing through the opening, so that the positioning yarn is held on the side of the light blocking plate away from the mouth of the opening. During spool change, the yarn is released from the disc brake and pulled through the light barrier. The temporary and rapid blocking action of the barndoor generates a signal indicative of a spool change. To load the monitor, the yarn is manually inserted into the disc brake. As long as the action is performed slowly, for example by a filter, the signal generation is blocked. In some cases, the slow loading action of the yarn through the light barrier is converted into another signal to confirm that the monitor has been loaded correctly. The operational safety of the photoelectric monitor is subject to unavoidable contamination and must be adjusted individually for different yarn qualities and/or yarn thicknesses.

Contents of the invention

The present invention aims to provide a monitor of the kind mentioned at the outset, which operates stably without the risk of yarn damage during bobbin changes.

This object is achieved by a monitor for monitoring yarn spool changes in a yarn handling system, said monitor being provided with a movable support element which can be moved during said spool change in a movement between a loading position and a monitoring position, a yarn positioning device for positioning the yarn within said monitor until the bobbin change occurs, a monitoring element within the movement path of the element with Responding to a relative position or a change in relative position of the element by a signal, and a pressure generator which exerts pressure on the element in the direction of movement of the element. The direction of movement of the monitoring position is applied to the element, and the positioning device includes a yarn clamping area, which is arranged relative to the movement path of the element from the loading position to the monitoring position, so that the yarn is in its The yarn clamping area forms an obstacle so that the element does not move under the applied pressure in the loaded position until the yarn spool is changed, and the yarn moves the obstacle during the yarn spool change And release the element so that it can automatically move from the loading position to the monitoring position under the action of the pressure.

Unlike the known mechanical monitor principle described at the outset, in which the element is displaced against the force by the yarn during a bobbin change, the monitor according to the invention is designed so that the yarn can only be This holding force is overcome in the yarn clamping area (clamping area) during shaft change. The holding force can be adjusted to be very low so that the delicate yarn material is not damaged during spool changing, and high enough to resist movement of the element supported by the yarn under the force. The element can only follow the released yarn under the action of the pressure without the yarn actively moving the element or the yarn deflecting at the element. The yarn allows the element to be automatically moved by the force from the loading position where it is blocked by the yarn to the monitoring position when the yarn is in the released state during bobbin changeover. In this way, the risk of yarn damage is eliminated.

During bobbin changeover, the yarn moves out of the yarn clamping area, which in substantially the same direction the element, accompanied by at least one moving part, moves towards the monitoring position.

Conveniently, the element is substantially a straight shaft with two arms, one arm of the rod responding to movement of the yarn during release of the yarn from the yarn clamping area, and The shaft rod moves away with the yarn when the yarn spool change indication signal is generated by the other arm.

In a preferred embodiment, the electronics for processing the signal are hermetically sealed within a monitor housing to prevent external interference and are provided, for example, on a printed circuit board. In this way, contamination such as lint, dust and in some cases the unavoidable avivage in textile technology does not have a negative effect on the contamination-sensitive electronic components.

In a preferred embodiment, at least one leaf spring is arranged in the yarn clamping region, the leaf spring being passed through by the element. The leaf spring very lightly and precisely fixes the yarn in a desired position on a bearing surface of the monitor housing. Alternatively, at least one holding device, such as a disc brake, is arranged on the side of the movable part of the element and may define the yarn clamping area.

Conveniently, a permanent magnet is provided within the element. The permanent magnet preferably fulfills a dual function. On one side, the permanent magnet cooperates with a fixed iron body to constitute the pressure generator, which generates pressure causing the element to follow the yarn during its release. On the other side, the permanent magnet can co-act with a fixed Hall sensor, constituting the monitor element for sending a signal. This signal is generated immediately when the permanent magnet approaches the Hall sensor or when the permanent magnet moves away from the Hall sensor or has moved away. The signal is processed to indicate that a change has occurred and/or, in certain circumstances, to indicate that the monitor has loaded the yarn. Alternatively, another monitoring element may be provided for cooperation with the permanent magnet or another sensor generating a loading signal.

Alternatively, the pressure generator may be at least one spring activating the element. In this case, the spring force can be directed in the direction of movement of the element from the loading position to the monitoring position.

Conveniently, the iron body is positioned relative to the trajectory of movement of the permanent magnet fitted element so that the pressure is strongest at the monitoring position and weakest at the loading position. This is an advantage because the yarn is only weakly loaded by the element in the loading position, but reaches the monitoring position safely with increasing pressure after the yarn has been released.

It is of particular advantage that a straight shaft with two arms is balanced in weight where the shaft is loaded. For this reason, the monitor operates also spatially independent of the mounting position.

Finally, it is convenient that, when the element has a working length at the end cooperating with the yarn, the yarn cannot under any circumstances move beyond the element. In this way, the predetermined geometrical relationship guarantees that the yarn cannot under any circumstances move behind the element.

In a preferred embodiment, the element is a bending spring pressure-preloaded in the loaded position. Preferably, the bending spring is a leaf spring. This embodiment is structurally very simple and stable, since the element does not require special supporting parts for operational movement.

Since the leaf spring facilitates the positioning of the yarn in the clamping region in any case, in another preferred embodiment the bending spring forming the element may be an integral part of the leaf spring for securing the yarn in the In the clamping area, more specifically, on at least one bearing surface. In this case, the leaf spring has a double function to reduce the number of parts of the monitor.

Conveniently, the leaf spring has two outer tines by which the yarn is positioned on either side of the element formed by the bending spring in the clamping region of the monitor. The bending spring may be an intermediate prong of said same leaf spring, which is fixed under bending preload on the housing, preferably at the entrance of an opening leading to the clamping area. The outer fork only needs to move relative to the bearing surface to a degree corresponding to the thickness of the yarn, while the bending spring formed by the middle fork can move to the monitoring position along the moving track. The preload loading the outer fork and the bending spring is conveniently generated from a common fixed or tensioned position of the leaf spring. Basically, a single outer fork is enough to fix the yarn.

Conveniently, the outer prong is wider than the central prong, which forms the bending spring. Therefore, the outer fork is more flexurally rigid than the flexural spring.

Basically, the bending spring and the outer fork are preferably designed with different preloads and/or spring properties to make them suitable for different applications. The outer fork needs to fix the yarn to the clamping area as lightly as possible, but stably. Instead, the bending spring is required to carry out the movement towards the monitoring position during the release of the yarn from the clamping zone and to load the yarn as lightly as possible while the yarn is positioned in the clamping zone. Different preloads and/or different spring properties reliably meet different requirements. It should be noted that, in addition, the bending spring should have a preload and/or a spring property such that the bending spring, and the permanent magnet disposed on the bending spring, behave less tensely.

Preferably, the bending spring in the transition region is transformed into a leaf spring with a narrow portion, so that the bending spring behaves relatively softly.

Additionally or alternatively, each outer fork may be stiffened against bending by means of at least one longitudinal corrugation or another stiffening structure, such as a housing detent in the form of a rib, the longitudinal corrugation or The stiffened structure preloads the outer fork and in some cases shortens the working spring length of the outer fork.

Description of drawings

Embodiments of the present invention are described with reference to the drawings. In this attached drawing:

Figure 1 is a schematic diagram of a processing system with monitors for a yarn spool change;

Fig. 2 is a longitudinal sectional view of the monitor, and a dotted line shows a second embodiment;

Figure 3 is a longitudinal sectional view of another embodiment of the monitor;

Figure 4 is a detailed top view of Figure 3; and

FIG. 5 is another detailed view of FIG. 3 .

Detailed ways

As shown in Fig. 1, in a yarn processing system S, two bobbins B1, B2 carrying the same yarn Y are installed on a creel 1, for example. A yarn processing device F, such as a yarn feeding device, draws yarn Y from said respective yarn bobbins B1, B2. The end of the yarn Y on one yarn bobbin B1 is connected by a knot to the front end of the yarn Y on the other yarn bobbin B2 (pigtail). For example, on the creel 1, a monitor D is installed at the position where the connection portion of the yarn Y is located.

When the yarn Y is exhausted from the yarn spool B1, the second yarn spool B2 produces a yarn spool change. During the changeover, the connection is pulled out of the monitor D before the yarn Y is thereafter withdrawn from the second yarn spool B2. During this transformation, the monitor D generates a signal i indicative of the transformation that has taken place. In some cases, the monitor D is designed such that during loading of the yarn Y to the monitor D, a similar or another signal representative of the loading process is emitted. Loading here means that the connecting yarn portion is inserted and positioned in the monitor D.

In the longitudinal sectional view of the monitor D shown in FIG. 2 , an opening 4 is provided on a lower side of a housing 3 . The opening 4 opens toward one end (to the left). Inside the extension of the opening 4, a yarn Y positioning device 5 is arranged. The positioning device 5 comprises a locally defined yarn clamping area 6 where the yarn Y is fixed after the process of loading the monitor D (as shown) the yarn Y.

The positioning device 5 carries the yarn clamping area 6, for example comprising a leaf spring C (shown in solid lines) arranged in the opening 4 . The leaf spring C has a passing slot (not shown). The leaf spring is pressed against the bearing surface 4a by preloading. In another case, the positioning device 5 may comprise at least one disc brake 6' positioned on the side of a slot 11 at the bottom of the opening 4. Alternatively, the positioning device 5 can be a holding device operated by a die casting.

A monitoring element 7 , such as a Hall sensor, is fixedly arranged in the housing 3 , for example, on a printed circuit board H. As shown in FIG. Moreover, a fixed iron body 8 is disposed at a position away from the monitoring element 7 . Inside the housing 3 , a mechanically movable support element E is provided to interact with the yarn Y, the monitoring element 7 and the iron body 8 . In the embodiment shown, the element E is a straight pivot rod 9 with two arms 9a, 9b. The pivot lever 9 is pivotable on a swivel axis 10, preferably within a restricted swivel area. A permanent magnet is located on the arm portion 9a near the end of the arm. The permanent magnet M cooperates with the monitoring element 7 (Hall sensor) and the ferrous body 8 .

In this embodiment, the arm 9 at the other end of the swivel axis 10 plunges into the longitudinal slot 11 in the housing 3 and into the leaf spring C at each swivel position of the pivot rod 9 . Despite the presence of the permanent magnet M, the pivot rod 9 is at least substantially weight balanced with respect to the axis of rotation 10 . The iron body 8 and the permanent magnet M generally constitute a pressure generator, which exerts a pressure 13 on the element E around the rotation axis 10 in the direction of the arrow shown in the figure.

The pivot rod 9 is pivotable between the shown loading position L where the permanent magnet M is close to the monitoring element 7 and a monitoring position P shown with dotted lines. The pressure 13 shown by the arrow is weakest at the shown loading position, but is strongest at the monitoring position P indicated. Alternatively or additionally, the element E can also be loaded in the same direction by a spring (similar to the embodiment shown in FIGS. 3 and 4 ).

During loading of the monitor D, in the yarn clamping zone 6, the yarn Y is brought into the position shown and fixed on the bearing surface 4a by the leaf spring C so that the pivot lever 9 moves into the shown loading position and contacts the yarn Y with relatively weak pressure 13 . The positioned and fixed yarn Y then forms an obstacle preventing the pivoting movement of the pivot rod 9 towards the monitoring position P.

During the yarn spool change, the yarn Y is released from the yarn clamping area 6 or 6' and is pulled out of the opening 4 in the direction of the arrow 12 of the bearing surface 4a. The pressure 13 is then pivoted The pivot rod 9 enters the monitoring position P. When the monitoring position is reached, or before, the signal i is sent. The pivot rod 9 remains in the monitoring position P until the next loading process.

Conveniently, the pivot rod 9 is a lightweight plastic molded part. The insertion depth of the arm portion 9a in the longitudinal slit 11 is chosen such that within the limited range of rotation of the pivot rod 9 the yarn Y cannot move within the opening 4 beyond the arm portion 9b.

In an alternative solution not shown, the arm 9a can be scanned photoelectrically inside the housing 3 to isolate the scanning tool from contamination. Furthermore, another monitoring element can be associated with the pivot rod 9 to indicate or determine the loading process. In an alternative solution, a runner or a shoe can be provided at the end of the arm 9b, which is lifted in the loading position L and gently dropped on The yarn Y is on. The slide-away portion or shoe has a downwardly extending engagement detent on the right side. In another alternative solution, a raised bearing surface can be provided on the arm 9b, which bearing surface contacts the yarn Y by means of pressure 13 in said loading position.

In the embodiment shown in FIGS. 3 and 4, the element E carrying the permanent magnet M is designed as a curved spring 18, for example a middle fork of the leaf spring C, the outer forks 16, 17 of which are used for positioning The yarn Y in the clamping zone 6 of the positioning device 5 . FIG. 4 is a top view of the leaf spring C fixed on the housing 3 (as in FIG. 3 ), and the leaf spring C is between the bearing portion 22 and the holder 23 of a tension control body 34 in the fixed position 15 . The leaf spring C is fixed under preload. The outer forks 16, 17, which are wider than the middle fork, adjoin the load-bearing surface 4a inside the opening 4, which is in some cases preloaded as long as there is no yarn Y thereunder (as indicated by the dotted line in Fig. 3).

The electronics of the monitor D, not shown in detail and which may be provided on a printed circuit board H, are sealed from the outside. The monitoring element 7, eg a Hall sensor, can also be arranged shielded or covered and driven by the permanent magnet M through a housing wall (eg composed of plastic material). Alternatively, the monitoring element 7' may even be arranged adjacent to the monitoring position P of the suspended spring 18, as shown in dotted lines in Fig. 3 . The monitoring elements 7, 7' can also be used to confirm the loading process.

This longitudinal slot 11 is open towards said lower side, so that the collected lint can fall downwards. The bending spring 18 may be slightly shorter than the outer forks 16, 17 so that the bending spring 18 moves in the direction of the arrow 12 from the position shown by the solid line after the yarn Y is released during the yarn spool changing process. Into the longitudinal slot 11 up to the detection position P, more specifically, it is pushed by the pressure 13 and moves along the side wall 25 ′ of the longitudinal slot 11 .

The monitoring position P of the bending spring 18 can be defined by a detent (not shown).

The function of the monitor shown in FIG. 3 is the same as that of the monitor shown in FIG. 2 .

The leaf spring C shown in FIG. 4 is designed such that the bending spring 18 as an intermediate fork must have a constant ratio of width and length, or as shown by the dotted line, the bending spring 18 can be provided with a groove defined by a cutout 20. Narrow portion 21 so that the bending spring 18 has a different bending behavior or preload than that exhibited at the outer forks 16, 17. The forks 16, 17 may even be stiffened by longitudinal pleats or other stiffening structures 25 (shown in dotted lines) ) stiffens so that the outer forks 16, 17 have a different bending behavior or preload than the curved spring 18. The leaf spring C may be stamped or laser cut from a substantially rectangular leaf spring blank 14. Alternatively, Provide an outer fork 16 or 17, or form one or two outer forks, for example by a leaf spring, this leaf spring has thickness and/or hardness than this second or softer leaf spring or bending spring 18 greater wall , which is separate and forms element E. In another alternative embodiment (not shown), the bending spring 18 may be a bending arm or bending wire (spring steel wire) welded in a cutout between the outer forks 16, 17 , to obtain different preloads or different bending behaviors to adapt to different tasks. This is because the outer forks 16, 17 must satisfy a clamping task, and the bending spring 18 should load the yarn Y as weakly as possible, And the yarn Y should be deflected as little as possible, and the swing (stroke) should be brought into the monitoring position P from the loading position L. The inner end of the opening 4 is designed to form a method for positioning the yarn Limiter for line Y.

Instead of a Hall sensor, another electronic component can be used as the monitoring element to respond with a signal to the presence, proximity or movement of a metal object or a magnet.

In the embodiment shown in FIG. 3 , the permanent magnet M can constitute a ballast weight and can thus assist in generating the pressure 13 that moves the bending spring 18 or the element E from the loading position L into the monitoring position P.

As shown in Figure 5, a rib-type housing detent 26 is provided to support the outer forks 16, 17, for example close to the fixed position, and extends to When the bearing surface 4a loads the outer forks 16, 17, the bending spring 18 acts softer than the other outer forks.

Claims (15)

1. A monitor (D) for monitoring yarn spool changes in a yarn handling system (S), said monitor being provided with a movable support element (E) which can be moved during said spool change , moving between a loading position (L) and a monitoring position (P), a yarn positioning device (5) for positioning the yarn (Y) within said monitor up to the bobbin Transformation takes place, a monitoring element (7), which responds to a relative position of the element (E) or a transformation of a relative position within the trajectory of movement of the element (E), and a pressure generator, the pressure The generator exerts a pressure (13) on the element (E) in the direction of movement of the element, characterized in that the pressure (13) moves from the loading position (L) to the monitoring position (P) of the element (E) imposed on said element (E) in the direction of movement, the positioning device (5) comprises a yarn clamping area (6) relative to the element (E) from the loading position (L) to the monitoring position (P) is set so that the yarn (Y) forms an obstacle in its yarn clamping zone (6) so that the element (E) in the loading position (L) is not under the applied pressure (13 ) until the yarn spool changes, and the yarn (Y) during the yarn spool change, moves the barrier and releases the element (E) so that it is under the pressure (13) It can automatically move from the loading position (L) to the monitoring position (P) under the action of . 2. The monitor according to claim 1, characterized in that, the yarn (Y) leaves from the positioning device (5) during the yarn spool changing process, and its leaving direction is in the same direction as the element (E) The directions of moving from the loading position (L) to the monitoring position (P) under the action of the pressure (13) are consistent. 3. The monitor as claimed in claim 1, characterized in that the electronic components for processing the signal (i) are arranged on a printed circuit board (H) and are hermetically arranged on the monitor (D) Inside a casing (3). 4. A monitor according to claim 1, characterized in that the element (E) is a straight shaft (9) provided with two arms (9a, 9b). 5. Monitor according to claim 1, characterized in that the yarn clamping area (6) comprises one of a leaf spring which allows the element (E) to pass through, or a leaf spring (C), Said leaf spring (C) is arranged on one side of the movement path of the element (E), a yarn clamping area (6') or another press-operated yarn holding device. 6. The monitor according to claim 1, characterized in that, the element (E) is provided with a permanent magnet (M), wherein the permanent magnet (M) constitutes the pressure generator and a fixed iron body (8) interaction, and the iron body (8) is positioned relative to the moving track of the permanent magnet assembled element (E), so that the pressure (13) acting on the element (E) is strongest at the monitoring position (P) and at This loading location (L) is the weakest. 7. A monitor according to claim 6, characterized in that the permanent magnet (M) interacts with a fixed Hall sensor constituting the monitoring element (7). 8. A monitor as claimed in claim 1, characterized in that the pressure generator is a spring engaging the element (E). 9. The monitor according to claim 1, characterized in that a monitor opening (4) is open to the side and towards an end, the yarn clamping area (6) is arranged in the opening (4), and The element (6) has a working length in the opening (4), so that the element (E) hinders the yarn in the opening beyond the element (E), within the limited axis rotation of the element (E) . 10. The monitor as claimed in claim 1, characterized in that the element (E) is a bending spring (18), which is preloaded by the pressure (13) in the loading position (L), and the bending The spring (18) is an integral part of a leaf spring (C) for fixing the yarn (Y) on a bearing surface (4a) in the yarn clamping area (6). 11. The monitor according to claim 10, characterized in that, the leaf spring (C) has one or two outer forks (16, 17), wherein the bending spring (18) is a middle fork, and the leaf spring (C) ) is fixed on the housing (3) under the action of bending preload. 12. A monitor as claimed in claim 11, characterized in that the bending spring (18) and the outer forks (16, 17) have different preloads or different spring properties. 13. Monitor according to claim 11, characterized in that the bending spring (18) has a narrowing (21) at a transition to the leaf spring (C). 14. Monitor according to claim 11, characterized in that the outer prongs (16, 17) are hardened against bending by a longitudinal fold or a stiffening structure (25). 15. Monitor according to claim 11, characterized in that the outer forks (16, 17) are preloaded by means of a rib-shaped housing stop (26).

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