EP0840705A1

EP0840705A1 - Thread feed

Info

Publication number: EP0840705A1
Application number: EP96925706A
Authority: EP
Inventors: Lars Helge Gottfrid Tholander; Egon Johansson; Thomas Bergman
Original assignee: Iro AB
Current assignee: Iro AB
Priority date: 1995-07-24
Filing date: 1996-07-10
Publication date: 1998-05-13
Anticipated expiration: 2016-07-10
Also published as: DE59604430D1; KR19990028682A; DE59604056D1; DE19533310A1; TW316933B; RU2129088C1; US6082654A; CN1079364C; CN1191518A; KR100279181B1; KR100293026B1; EP0840705B1; KR19990028683A; WO1997003907A1

Abstract

A thread feed (F) with a thread brake holder (H) in a housing extension (2, 2a) has a support (6a) for a holder (5) of the thread brake body (4) and a movement drive with a cylindrical piston (6b) movable in a cylinder (7) to move the thread brake body (4) between a braking position and a position separated from a magazine (3) of the thread feed (F). The piston (6b) is fitted on the support (6a) as an integrated guide component thereof. There is at least one guide nose (9) engaging with a guide track (10) integral with the extension at a transverse distance from the piston axis (X) to prevent rotation.

Description

Thread delivery device

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

In a yarn delivery device known from EP 0 446 447 A1, the supporting body is a sliding carriage which can be moved in the boom by means of a compressed air cylinder / piston unit. A spring is housed in the cylinder and acts on the piston in the opposite direction to the compressed air. The piston rod is coupled via a joint to an adjusting screw, on which the sliding carriage, which is separated from the piston in guideways of the boom, is fixed. The holder of the thread brake body, which can be adjusted relative to the sliding carriage by means of an adjusting screw, is guided by the sliding carriage. A high manufacturing effort is required to guide the sliding carriage in the boom and the holder on the sliding carriage. The heavy soiling due to the secreting thread material, the relatively strong reaction forces of the support of the thread brake body on the storage body which vibrates somewhat during operation, unavoidable wear in the various guideways, the many-part construction of the holding device and the need for easy adjustment of the thread brake body with exactly reproducible braking position, can lead to problems, because of which the gap position and / or the braking position cannot be set as predetermined. Furthermore, the versatile holding device takes up considerable installation space.

The invention has for its object to provide a thread delivery device of the type mentioned, in which the holding device is simple to manufacture and assemble from a few parts, and the predetermined position of the thread brake body reliably both with frequent and also can guarantee with rare adjustment. The object is achieved with the features of patent claim 1.

The holding device is simple in terms of production technology (large series production) and assembly technology and is robust in operation. It consists of only a few parts and takes up relatively little installation space (compact design). There is a very stable and exact guidance and positioning of the thread brake body by the piston and the guide nose which acts as an anti-twist device, reaction forces being transmitted over a large area, over a considerable length and with favorable lever arms into the boom. The adjustment of the thread brake body can be carried out smoothly over long idle times. Predetermined positions of the thread brake body are reliably achieved with frequent and with rare adjustment cycles. The holding device can be used universally and without any noteworthy modifications in thread delivery devices in which an automatic adjustment (pressurized air to the piston) takes place for threading and changing the thread brake body, and also in thread delivery devices in which only manual adjustment is desired. The piston has a dominant guiding task in the manually operated version, its guiding area in the cylinder being well shielded from dirt, while the piston in the automatic version also takes over the driving task. If necessary, it can be provided with one or more seals. However, it is also conceivable to use material combinations which have self-lubricating properties, for example a Teflon coating on the piston and / or the cylinder. The piston forms a unit with regard to stable guidance and mounting of the thread brake body with the support body. Nevertheless, the piston can possibly be manufactured as a separate component and firmly connected to the supporting body. A one-piece design of the cylinder in the boom (claim 2) simplifies production and provides an exact guidance for the thread brake body.

The embodiment according to claim 3 is favorable in terms of production technology. Injection molding technology, with which high dimensional and dimensional accuracy are guaranteed, is particularly suitable for large series production

According to claim 4, the piston is guided by the spring to the braking position of the thread brake body set with the adjusting screw. The holder no longer needs to be adjusted and guided relative to the supporting body, but instead assumes the position predefined by the supporting body, which is determined by the adjusting nut position and can be changed as desired. The spring can also be used to set the braking position. As a positive side effect, the holder can be quickly adjusted by hand against the spring without also having to move the adjusting screw. In order to save further parts, the spring and the set screw nut could, however, be omitted in a simplified embodiment and the set screw could be screwed directly into the piston.

A stable, in particular wide, support is obtained in the embodiment according to claim 5. Construction space is saved in the radial direction, based on the axis of the storage body, and a compact design of the holding device is achieved. This provides enough space for further components of the thread delivery device to be accommodated in the boom, e.g. Sensors or the like. Created.

The embodiment according to claim 6 is structurally simple.

In the embodiment according to claim 7, the rotational security and the axial mobility of the set screw nut achieved by the cross section of the pipe section in a structurally simple manner.

In the embodiment according to claim 8, a cheap long spring can be accommodated without wasting additional installation space. The long, centrally located spring ensures that the thread brake body reliably comes back into the braking position. The adjusting sleeve enables the thread brake body to be moved manually, e.g. for setting the gap position for threading a thread or for exchanging the thread brake body.

The embodiment according to claim 9 is structurally simple, robust and reliable, in which the thread brake body is adjusted by twisting the adjusting sleeve. The required rotary stroke of the adjusting sleeve, the movement stroke of the thread brake body and the actuating force can be predetermined by the shape and the length of the guide groove. It is conceivable to attach the coupling element to the adjusting sleeve and to form the guide groove in the rotary mount in the boom.

A uniform adjustment is given in the embodiment according to claim 10. The suitably provided blocking section on one or both ends of the guide groove allows the adjusting sleeve to be blocked in such a way that it is held immovably under the influence of only an axial force. It is expedient to design the respective transition from the guide groove into the blocking section in a detent-like manner, so that it can be clearly felt on the rotary handle of the adjusting sleeve that or whether the coupling element has entered the blocking section.

A convenient actuation of the set screw is given in the embodiment according to claim 11. The rotary locking enables a finely controlled rotation of the screw and prevents either the adjusting screw or the adjusting sleeve from rotating automatically.

In the embodiment according to claim 12, a pivoting movement of the thread brake body is possible. The pivot is supported stably.

In the embodiment according to claim 13, an automatic adjustment of the thread brake body into the gap position by pressurized air is provided. The spring then acts on the piston to reset it. The set screw is not moved during the adjustment movement because the set screw nut is displaced in the piston. This contributes to a low resistance to movement. In a manually operable embodiment, the compressed air connection allows the air displaced by the piston under the action of the spring to escape with little resistance.

The embodiment according to claim 14 is particularly expedient, in which the thread brake body is fixed in the gap or exchange position and does not unintentionally re-enter under the force of the spring or, if necessary, even when the piston is pneumatically actuated when the pressure decreases adjusted the braking position.

The variant according to claim 15 requires manual manipulation to engage and / or disengage the safety device, while in the embodiment according to claim 16 the safety device alone is engaged or released by the movement of the thread brake body. It is only necessary to move the thread brake body into the desired position (by hand or by means of pneumatic action on the piston) so that the safety gear is engaged. A slight further movement (by hand or by pneumatic actuation of the piston) is required to release the safety gear. This is before the spring returns the thread brake body to the braking position.

Embodiments of the subject matter of the invention are explained below with reference to the drawing. Show it:

1 shows a longitudinal section of a thread delivery device with a holding device for a thread brake body,

2 shows a frontal view of the thread delivery device from FIG. 1,

3 shows a longitudinal section through another embodiment of a thread delivery device, and

4 shows a detail section in the plane of the axis 11 in FIGS. 1 and 3.

1 to 4 show two embodiments of thread delivery devices F, each with a holding device H for a thread brake body 4, the functionally corresponding components which differ from one another in appearance and size being provided with the same reference numerals.

1 and 2, a cantilever 2 with a cantilever end part 2a is arranged on a housing 1 and extends along the outer circumference of a storage body 3 approximately parallel to its longitudinal axis and beyond the storage body 3 from the housing 1 . A thread brake body 4 of an annular thread brake B shown in its braking position in FIG. 1 cooperates with the storage body 3 in the usual way. The thread brake body 4 is arranged in a manner not shown in detail on a holder 5 which (FIG. 2) is fork-like and is supported in a support body 6a. The holder 5 is either permanently connected to the support body 6a or (FIG. 1) to the support body 6 in the longitudinal direction of the readout. gers 2, 2a firmly connected and pivotable about an approximately radial axis 11 to the storage body 3. A cylindrical piston 6b is preferably connected in one piece to the support body 6a, which projects from the support body 6a in the direction of the housing 1 and is displaceably guided in a cylinder 7 integrally molded in the bracket 2, 2a. The cylinder 7 has a compressed air connection 8, to which - if required - a compressed air source can be connected.

A guide lug 9 is provided on the support body 6a and / or on the piston 6b at a distance from the piston axis X and engages in a longitudinal guide 10 of the boom. It would also be conceivable to provide the guide lug 9 in the boom and to have it engage in a guide for the supporting body 6a or the piston 6b.

2, the piston axis X is arranged on one side of a center plane M of the brake body 4, while the guide nose 9 and the longitudinal guide 10 are located on the other side of this central plane. In this way, a guide for the thread brake body, which takes up little space in the radial direction, is achieved with favorable lever arms with respect to the central plane M.

The piston 6b is tubular and has a transverse wall on the inside which forms an axial stop 12. The transverse wall is provided with a bore through which a threaded section 15 of an adjusting screw 13 passes. The cross section of a tube section 17 of the piston 6b is matched to the circumferential configuration of a set screw nut 16 which is held in the tube section 17 in a manner fixed against relative rotation but displaceable in the direction of the piston axis X. A damping and sealing O-ring 18 can be provided between the adjusting nut 16 and the axial stop 12. On the other side of the axial stop 12, a prestressed coil spring 19 is supported, which passes through the supporting body 6a, dips into the piston 6b and at the embodiment of FIG. 1 rests with its other end on an adjusting sleeve 21 which supports the adjusting screw 13. The adjusting sleeve 21 can be rotated coaxially to the piston axis X in a rotary mount 20 of the boom end part 2a and projects outwards with a widened head part 22. A handle 23 is provided on the head part 22, with which the adjusting sleeve 21 can be rotated. A head 14 of the adjusting screw 13 is held in a rotary knob 17 which has knurling and is supported on the head part 22 with the interposition of a rotary catch 28. The rotary catch 28 contains, for example, a catch member loaded by a spring which interacts with catch recesses in the head part 22.

The adjusting sleeve 21 is provided with at least one inclined, e.g. provided thread-like, both-ended guide groove 25 into which a coupling element 24 designed as a pin engages, which is attached in the boom end part 2a. The guide groove 25 expediently has blocking sections 25a running at both ends in the direction of rotation, into which the coupling element 24 enters when an axial adjustment of the adjusting sleeve 21 under axial pressure is to be excluded. The adjusting screw 13 is rotatably mounted in the adjusting sleeve 21 and carries a retaining element R, via which the reaction force of the thread brake body 4 is transmitted to the adjusting sleeve 21 and from there to the coupling element 24 and the extension arm 2, 2a.

The boom end part 2a contains (FIG. 2) a widened wall 30 and a thread eyelet 29 coaxial with the axis of the storage body. The end part 2a is fastened at 31 to the boom 2.

The cross section of the supporting body 6a with the integrally formed piston 6b and the guide lug 9 can be seen schematically in FIG. 4. The piston 6b with the axial stop 12 is located on one side of the axis 11 or the central plane M, while the guide lug 9 is integrally formed on the opposite side. A bore 35 serves to receive a pivot pin for pivotally attaching the holder 5 to the support body 6a, as will be explained later with reference to FIG. 3.

In Fig. 1, the thread brake body 4 is in the braking position, in which it is pressed axially with a predetermined axial force on the storage body 3. This position is either defined by the adjusting nut 16 intercepted on the axial stop 12 or, more appropriately, by the force equilibrium between the resilient reaction force of the thread brake body 4 and the force of the spring 19. If the axial stop 12 is in the position of FIG Set screw nut 16, then by unscrewing the set screw 13 by means of the rotary knob 27, the piston 6b can be moved further to the left in order to increase the pressure on the thread brake body. If, on the other hand, the set screw 13 is tightened, the piston 6b is pulled further to the right via the set screw nut 16 in order to reduce the pressure on the thread brake body 4.

In order to bring the thread brake body 4 into a gap position with respect to the storage body 3, for example in order to thread a thread or to replace the thread brake body 4, the rotary handle 22 is actuated and the adjusting sleeve 21 is rotated so that the adjusting sleeve 21 thanks to the engagement of the coupling element 24 1 is pulled to the right and, via the rotary knob 27, pulls the adjusting screw 13, which in turn transfers the piston 6b with the support body 6a and the damper brake body 4 into the gap position via the adjusting nut 16. The course of the guide groove 25 can be such that there is a self-locking and any position of the thread brake body 4 is automatically maintained. However, it is also conceivable to rotate the adjusting sleeve 21 so far, expediently by about half a turn, until the coupling element 24 has entered the blocking section 25a on the left. The rotary handle 23 is used to reset the thread brake body 4 into the braking position actuated in the other direction, and the adjusting sleeve 21 brought back into the position shown in FIG. 1.

The thread delivery device F according to FIG. 1 can be converted if necessary for an automatic adjustment of the thread brake body 4. For this purpose, a compressed air source is connected to the compressed air connection 8, which, when activated, acts on the piston 6b and moves against the force of the spring 19 as far as possible up to the stop on the adjusting sleeve 21. The set screw 13 maintains its position; the adjusting nut 16 is shifted in the tube section 17. If the pressurization of the piston 6b is released, the spring 19 presses the piston 6b and with it the support body 6a and the thread brake body 4 back into the braking position. In order to then gain more space for exchanging the thread brake body, the adjusting sleeve 21 can also be rotated - as mentioned above.

The embodiment of the thread delivery device F according to FIG. 3 has a holding device H which is both automatic (by pressurizing the piston 6b with compressed air from the connector 8a inserted in the compressed air connection 8) and for manual adjustment (by hand gripping the holder) 5), is designed. A cover cap 6c is additionally provided in the piston 6b. On the adjusting screw 13, a lock nut 16a is attached. In the end part 2a of the boom 2, the set screw 13 is axially immovable, but rotatable, by means of the retaining element R (e.g. a yoke ring). The rotary knob 27 works together with a right-hand end surface of the end part 2a, into which locking recesses for the rotary locking 28 are formed. The spring 19 is supported with its right-hand end directly on a counter surface 32 of the end part 2a. The holder 5 is pivotable with a pivot pin 33 in the support body 6a and the axis 11.

In addition, a safety device C can be provided, with which the support body 6a with the piston 6b in a gene of the piston 6b or pulling the holder 5 set gap or exchange position against the force of the spring 19 is intercepted. A manually operable engaging or disengaging element 34 can be seen from the catching device C, which can actuate a catching element (not shown) which can be engaged against spring loading or disengageable under spring loading and which engages behind a stop (not shown) of the supporting body 6a.

The safety device C is expediently designed such that it engages by pressing the engaging element 34 as soon as the thread brake body 4 has reached the gap or exchange position. The catch element (not shown) is disengaged again and the engagement or disengagement element 34 is returned to the position shown by a renewed movement, either by striking the piston 6b or by pulling the holder 5 by hand.

The support body 6a with its integrally molded piston 6b of FIG. 3 is indicated in FIG. 4 a section in the plane of the axis 11. The bore 35 serves for mounting the pivot pin 33. A shoulder for engaging the safety device C is indicated by the broken line at 36. The guide nose 9 engages on the side of the center plane M opposite the piston axis X in the guide 10 of the arm 2 in order to achieve the largest possible lever arms for guiding and supporting the thread brake body 4.

3 (but also the thread delivery device F according to FIG. 1), instead of the manually operated safety catch device E, an automatically acting safety catch device in the manner of a ratchet lock or a step-by-step mechanism could be provided, which intervenes and holds the support body 6a in the gap or exchange position of the thread brake body 4 when the unit comprising the support body 6a and piston 6b has been adjusted accordingly. A further movement of the unit from the support body is required to release the automatic catching device 6a and piston 6b are required in the same direction of movement, for example by re-loading the piston 6b or by pulling the holder 5 to the right in FIG. 3 in order to automatically release the catching device. Then the thread brake body 4 automatically returns to the braking position under the action of the spring 19.

In the embodiment of FIG. 1, the spring 19 and the adjusting screw nut 16 could be omitted if the adjusting screw 13 is screwed with its threaded section 15 directly into the transverse wall of the piston 6b forming the axial stop 12. Then, however, there would be no possibility of adjusting the thread brake body 4 by simply pulling on the holder 5 and no pneumatic action could be taken on the piston 6b.

The unit comprising the support body 6a and the piston 6b is favorable in terms of production because a clean engagement between the cylinder 7 and the piston 6b and a largely play-free anti-rotation device can be achieved by the engagement of the guide lug 9 in the guide 10 of the boom . The interplay between the cylindrical piston 6b and the cylinder 7, which is also integrally molded into the boom 2, is easy to control, as is the interplay between the guide lug 9 and the guide 10, without any significant wear and, above all, without danger Functional impairments due to the accumulation of contaminants such as thread material, dust and lint, which occur in such a thread delivery device and are of a large size. Furthermore, assembly is simple since only the piston needs to be inserted into the cylinder and the guide lug into the guide. In the embodiment of FIG. 1, the adjusting sleeve 21 can be prefabricated with the adjusting screw 13 and the screwed-on piston 6b with the supporting body 6a. The holder 5 is then mounted through an opening from above in the bracket 2 on the support body 6a.

Claims

claims

1. Thread delivery device (F) with a holding device (H) for an annular thread brake body (4), the holding device (H) being arranged in a housing arm (2a) and a supporting body (6a) guided linearly movably in the arm for a holder (5) of the thread brake body (4) and one

Carrier body movement drive with a cylindrical piston (6b) which can be displaced in a cylinder (7), possibly against at least one spring (19), around the thread brake body (4) between a braking position and at least one gap position which can be adjusted by the movement drive to move in each case relative to a storage body (3) of the thread delivery device (F) encompassed by the thread brake body (4), characterized in that the piston (6b) is arranged on the support body (6a) and an integrated guide element of the support body (6a ), and that on the piston (6b) and / or on the support body (6a) at a transverse distance from the piston axis (X) at least one guide nose (9) engaging in a guide track (10) fixed to the boom is provided as a means of preventing rotation.

2. Thread delivery device according to claim 1, characterized in that the cylinder (7) is integrally formed in the boom (2).

3. Thread delivery device according to claim 1, characterized in that the supporting body (6a) with the piston (6b) is an integral molded part, preferably made of metal, light metal or plastic.

4. Thread delivery device according to at least one of claims 1 to 3, characterized in that the holder (5) on the supporting body (6a) is fixedly attached in the adjusting direction, that in the Ausle¬ ger (2) rotatable in the adjusting direction with respect to the boom (2nd ) supported adjusting screw engaging in the piston (6b) (13) it is provided that a set screw nut (16) which is displaceable relative to the piston is arranged in a rotationally fixed manner in the piston (6b), and that the spring (19) is pretensioned and the set screw nut (16) in the direction applied to a piston-fixed axial stop (12).

5. Thread delivery device according to claim 4, characterized in that the piston (6b) and the adjusting screw (16) on one side and the guide lug (9) on the other side of a middle salmon plane (M) of the thread brake body (4) and the boom (2) are arranged.

6. Thread delivery device according to claim 5, characterized in that the piston (6b) is tubular in form with a transverse wall forming the axial stop (12), that the spring plunges from behind into the piston (6b) and is supported on the transverse wall .

7. Thread delivery device according to one of claims 1 to 6, characterized in that a tube section (17) of the piston (6b) provided as a movement space for the set screw nut (16) has a circumferential configuration of the set screw nut (16) ) has a coordinated cross-section.

8. Thread delivery device according to at least one of claims 1 to 7, characterized in that the spring (19) surrounds the adjusting screw (13) and at its end facing away from the axial stop (12) either directly in the boom (2, 2a) or is supported on an adjusting sleeve (21) which is axially and manually displaceable in the boom (2, 2a) and in which the adjusting screw (13) is mounted so that it cannot move axially.

9. Thread delivery device according to claim 8, characterized in that the adjusting sleeve (21) in a to the piston axis (X) koaxia¬ len rotary socket (20) of the boom (2, 2a) is arranged, carries an externally accessible twist grip (23) and in loading The rotary socket (20) has an axially limited guide groove (25) which rises relative to the direction of rotation, and that a coupling element (24) engaging in the guide groove (25) is held in the extension arm (2, 2a).

10. Thread delivery device according to claim 9, characterized in that the guide groove (25) is designed like a thread and has at least one end ver approximately in the direction of rotation blocking section (25 a).

11. Thread delivery device according to at least one of the preceding claims, characterized in that the head (14) of the adjusting screw (13) is inserted in a rotary knob (27) which with a rotary catch (28) at the free end of the Ausle¬ gers (2, 2a) sits directly or on a head part (22) of the adjusting sleeve (21).

12. Thread delivery device according to at least one of claims 1 to 11, characterized in that the holder (5) of the Faden¬ brake body (4) with a lying in the central axis plane (M) lying pivot (33) pivotally mounted in the support body (6a) is.

13. Thread delivery device according to at least one of claims 1 to 12, characterized in that the cylinder (7) has a compressed air connection (8).

14. Thread delivery device according to at least one of claims 1 to 13, characterized in that in the boom (2, 2a) a gap or exchange position for the thread brake body (9) defining catch device (C) for the against the spring (19) adjusted thread brake body (4), which acts against the direction of action of the spring (19) on the piston (6b) or on the supporting body (6a).

15. Thread delivery device according to claim 14, characterized gekennzeich¬ net that the catching device (C) from the outside of the boom (2, 2a) accessible, manually operable, possibly spring-loaded engagement and disengagement element (34).

16. Thread delivery device according to claim 13, characterized gekennzeich¬ net that the catching device (C) by means of the piston (6b) or manually effected adjustment movement of the thread brake body (4) automatically engages and disengages, and e.g. is designed as a step switch or ratchet lock.