EP0959168A1 - Nahtschutzvorrichtung für Textilveredlungsmaschinen - Google Patents

Nahtschutzvorrichtung für Textilveredlungsmaschinen Download PDF

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Publication number
EP0959168A1
EP0959168A1 EP99108418A EP99108418A EP0959168A1 EP 0959168 A1 EP0959168 A1 EP 0959168A1 EP 99108418 A EP99108418 A EP 99108418A EP 99108418 A EP99108418 A EP 99108418A EP 0959168 A1 EP0959168 A1 EP 0959168A1
Authority
EP
European Patent Office
Prior art keywords
fabric
drum
bar
bar means
working
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99108418A
Other languages
English (en)
French (fr)
Other versions
EP0959168B1 (de
Inventor
Bruno Scortegagna
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lafer SpA
Original Assignee
Lafer SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lafer SpA filed Critical Lafer SpA
Publication of EP0959168A1 publication Critical patent/EP0959168A1/de
Application granted granted Critical
Publication of EP0959168B1 publication Critical patent/EP0959168B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C11/00—Teasing, napping or otherwise roughening or raising pile of textile fabrics

Definitions

  • This invention concerns a device to protect the stitches on the fabric being worked on textile machines as set forth in the main claim.
  • the invention is applied in textile machines, particularly raising and grinding machines with a drum, to protect the stitches used to join together the pieces of fabric so as to make a single continuous strip which is then subjected to processing.
  • the device prevents the join stitches from being subjected to the action of the working elements of the textile machines, and thus prevents possible damage and breakages.
  • the stitches used may be of the "cut and sew" type, which provides to put the two edges which are to be joined side by side without laying one on top of the other.
  • This type of stitch has the advantage that it maintains unchanged the thickness of the fabric but, on the other hand, it is structurally weak since the sewing threads are not protected from the action of the working cylinders, and thus there is a high probability they may break and rip.
  • chain stitches which provide to put the pieces of fabric to be joined one on top of the other so that the join stitches are made on the opposite side of the fabric from the side subjected to processing, and therefore they are protected from the action of the working cylinders.
  • the stitch is doubled, or tripled, and the edges of the fabric which have to be joined are put on top of each other several times.
  • Chain stitching causes an increase in thickness of the fabric which, when the fabric is lapped or rolled, forms a line on the layers of fabric adjacent to the stitch. The line is repeated over several laps or rolls, which causes a deterioration in the quality of the fabric and, often, it is necessary to repeat the work or discard several metres of fabric.
  • This solution has the advantage that it is simple but, on the other hand, it entails the discard of many metres of fabric since the cylinders do not work parts of the fabric which in length are substantially almost twice the circumference of the drum of the textile machine, which, in average-size raising and grinding machines, can be quantified as about four metres.
  • This protection element which is made to start by sensors which monitor the arrival of the stitches at the textile machine, lifts the fabric in correspondence with the stitch and safeguards it from the action of the working cylinders.
  • the protection element rotates by 360° around the drum, which entails that it passes in correspondence with the brushes provided below the drum used to clean the working cylinders.
  • the protection element stops and inverts its direction of travel, returning to its starting position while awaiting the new stitch.
  • This device placed between the fabric and the working cylinders has a plurality of disadvantages.
  • the fabric breaks, which can happen due to tears upstream from the raising operation, it may be that the fabric itself ties the bar to the working cylinders, in this case too causing damage to the coverings or to the bar itself.
  • a further disadvantage is that, given the width of the machine, the tension of the fabric and to avoid excessive bending, the bar must have a large size in the radial direction.
  • the bar must be located at a certain distance therefrom.
  • the purpose of the invention is to provide a device to protect the stitches from the action of the working elements in a textile machine with a drum, which will have a minimum impact on the working of the fabric itself and which, at the same time, is simple to achieve and to operate, economical and easy to maintain.
  • Another purpose of the invention is to provide a device which can also be used on already existing textile machines without substantially altering the configuration thereof.
  • the device according to the invention provides to use bar means equipped with attachment means suitable to lift the fabric in correspondence with the stitches which join two adjacent pieces, distancing the fabric from the working elements of the textile machine.
  • the bar means are located outside the fabric being worked and rotate around the drum, which allows to avoid the problems of interference with the cleaning means and also of lifting the fabric when it is not necessary.
  • the bar means are positioned substantially parallel to the axis of rotation of the drum and rotate with the same centre of rotation as the drum and with a radius greater than the radius of the drum.
  • the bar means have a first inactive position wherein the attachment means with which they are equipped do not interfere with the fabric and a second working position wherein the attachment means interfere with the fabric, gripping it and lifting it from the working cylinders.
  • the bar means move to the working position wherein they grip the fabric in the area around the stitch and lift it from the working cylinders.
  • the bar means are made to rotate outside and around the drum to approximately the point where the fabric leaves the drum. At this point, the bar means move to the inactive position wherein the attachment means release the fabric which can thus be discharged from the drum.
  • the bar means free of the fabric, can then be returned to the starting position to await the new stitch without any interference with the fabric.
  • the bar means are driven by drive means with a controlled drive so as to assume moment to moment the same speed as the fabric which they have attached.
  • the drive means cause the bar means to rotate at a speed which, at the moment of attachment, is synchronised with the speed of the inlet drawing cylinder and, at the moment of release, is synchronised with the speed of the outlet drawing cylinder, the speeds being different from each other due to the stretching of the fabric during the raising operation.
  • the drive means start the bar means at a speed synchronised with the inlet drawing cylinder, and then are de-activated, leaving the fabric itself to draw the bar means, in which case the speeds are consequently adapted.
  • the outside position of the means which lift the fabric from the working elements of the textile machine entails a plurality of advantages.
  • the fabric may be lifted by very little, since the bar means, as they attach the fabric from outside, can lift it even only by a few millimetres, at most 10.
  • the zone where no raising is carried out is drastically reduced on either side of the stitches, and is no more than 15 ⁇ 20 cm.
  • the tact that the speed of rotation of the bar means is synchronised with respect to the fabric ensures a perfect control of the non-raised zone, and therefore of the loss of fabric on either side of the stitches.
  • Another advantage is that it is possible to make the fabric itself draw the bar means, which ensures that the device can be adapted perfectly to every type of fabric and every type of tension, yet an extremely limited non-raised area can still be maintained on either side of the stitches.
  • the fabric can be released at any moment if there are operational problems and blockages during the passage of the stitch, without any consequences; the machine, moreover, can be rapidly restored to working conditions.
  • Fig. 1 is a side view in diagram form of a drum 10 of a raising machine, on the circumference of which there are parallel raising cylinders 11 lined with a covering equipped with metallic points 11a which on the even cylinders are inclined in the direction of feed, and on the odd cylinders in the opposite direction.
  • the metal points 11a pull the fibres of the threads which make up the fabric 12, so that at the outlet of the drum 10 a fabric 12a is obtained which has a downy worked surface.
  • drawing cylinders At inlet to and at outlet from the drum 10 there are drawing cylinders, inlet 14a and outlet 14b, and at the lower part there are cleaning means 13, in this case consisting of two counter-rotating brushes 13a.
  • the device 15 comprises bar means 16, equipped on the periphery with attachment means 20, governed by means 17 to monitor the arrival of a stitch 19 joining the pieces of fabric 12.
  • the attachment means 20 are suitable to lift the fabric 12 in correspondence with the stitch 19, preventing contact with the raising cylinders 11.
  • the bar means 16 move along a path 18, shown in Fig. 1 with a line of dots and dashes; they move from a starting or start of cycle position 16a, wherein the attachment means 20 attach and lift the fabric 12, to an arrival or end of cycle position 16b, wherein the attachment means 20 release the fabric 12, and vice versa.
  • the path 18 is outside the fabric 12, which allows to prevent problems of interference between the bar means 16 and the cleaning means 13, and also problems of unwanted lifting of the fabric 12 when not necessary.
  • the lifting of the fabric 12 is reduced to a minimum since the attachment means 20, acting from outside, lift the fabric 12 even only by a few millimetres, which allows to have non-raised segments "t" of an extremely limited length, not more than about 15 ⁇ 20 cm, and a maximum lifting "s" of the fabric 12 of about 10 mm.
  • the device 15 according to the invention functions as follows:
  • the bar means 16 are made to rotate externally around the drum 10 until they reach the arrival position 16b where the attachment means 20 release the fabric 12.
  • Figs. 2 ⁇ 4 show a possible form of embodiment of the device 15 according to the invention wherein the bar means 16 are parallel to the axis of rotation 21 of the drum 10 and the attachment means 20 consist of a plurality of hooks 23 aligned longitudinally to the bar means 16 and suitable to be inserted between the meshes of the fabric 12 and attach it.
  • the attachment means 20 consist of grippers, needles, crooks or other similar elements.
  • attachment means 20 made of velcro or other material suitable to attach and lift the fabric 12.
  • attachment means 20 are shaped in such a manner that, at outlet from the drum 10, they become detached from the fabric 12 simply because the bar means 16 stop rotating.
  • the bar means 16 are supported at the ends by a pair of levers or arms 22, provided at the sides of the drums 10 and rotating on the same axis of rotation 21 as the drum 10.
  • the arms 22 are driven by drive means 24 on the shaft 25 of which drive wheels 26 are keyed, the drive wheels 26 being associated by flexible transmission means 27, for example belts or chains, to respective driven wheels 28 solid with the arms 22.
  • the drive means 24 are driven in a controlled manner so that the bar means 16 move along the path 18 at the same speed as the fabric 12.
  • the drive means 24 are driven only at the start, so that they are synchronised with the speed of the fabric 12, after which they are de-activated, so that the fabric 12 itself is left to draw the bar means 16.
  • the attachment means 20 have an inactive position wherein they do not interfere with the fabric 12 and a working position wherein they grip the fabric 12 and lift it by a desired value "s".
  • the bar means 16 rotate through 90°, the rotation being achieved by a pair of actuators 29, each of which is constrained on the outer face of a respective arm 22.
  • the actuators 29 are constrained on the inner face of the respective arm 22.
  • the pistons of the actuators 29 are constrained oscillating to a first end of a lever 30 radially associated with the bar means 16 so that every time the pistons of the actuator 29 are activated, the lever 30 is taken to respective positions which are orthogonal to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Sewing Machines And Sewing (AREA)
EP19990108418 1998-05-20 1999-04-29 Nahtschutzvorrichtung für Textilveredlungsmaschinen Expired - Lifetime EP0959168B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD980086 1998-05-20
IT98UD000086 IT1299797B1 (it) 1998-05-20 1998-05-20 Dispositivo per la protezione delle cuciture sul tessuto in lavorazione in macchine tessili

Publications (2)

Publication Number Publication Date
EP0959168A1 true EP0959168A1 (de) 1999-11-24
EP0959168B1 EP0959168B1 (de) 2003-03-12

Family

ID=11422676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990108418 Expired - Lifetime EP0959168B1 (de) 1998-05-20 1999-04-29 Nahtschutzvorrichtung für Textilveredlungsmaschinen

Country Status (4)

Country Link
EP (1) EP0959168B1 (de)
DE (1) DE69905795T2 (de)
ES (1) ES2195467T3 (de)
IT (1) IT1299797B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1178148A2 (de) * 2000-08-01 2002-02-06 Giuseppe Caccia Vorrichtung zum automatischen Anbringen von Nahtschutzbändern auf laufende Warenbahnen
EP1239070A1 (de) * 2001-03-06 2002-09-11 LAFER SpA Vorrichtung und Verfahren zum schützen von Nähten auf Textilmaschinen
CN116463809A (zh) * 2023-06-16 2023-07-21 江苏沛飞特包装材料有限公司 一种滚筒式纺织物倒勾型起绒器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613972A1 (de) * 1993-03-04 1994-09-07 MARIO CROSTA S.r.l. Nahtschutzvorrichtung für Trommelschleif- oder Rauhmaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613972A1 (de) * 1993-03-04 1994-09-07 MARIO CROSTA S.r.l. Nahtschutzvorrichtung für Trommelschleif- oder Rauhmaschine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1178148A2 (de) * 2000-08-01 2002-02-06 Giuseppe Caccia Vorrichtung zum automatischen Anbringen von Nahtschutzbändern auf laufende Warenbahnen
EP1178148A3 (de) * 2000-08-01 2004-04-28 Giuseppe Caccia Vorrichtung zum automatischen Anbringen von Nahtschutzbändern auf laufende Warenbahnen
EP1239070A1 (de) * 2001-03-06 2002-09-11 LAFER SpA Vorrichtung und Verfahren zum schützen von Nähten auf Textilmaschinen
CN116463809A (zh) * 2023-06-16 2023-07-21 江苏沛飞特包装材料有限公司 一种滚筒式纺织物倒勾型起绒器
CN116463809B (zh) * 2023-06-16 2023-10-10 江苏沛飞特包装材料有限公司 一种滚筒式纺织物倒勾型起绒器

Also Published As

Publication number Publication date
ITUD980086A1 (it) 1999-11-20
EP0959168B1 (de) 2003-03-12
DE69905795T2 (de) 2004-02-05
DE69905795D1 (de) 2003-04-17
IT1299797B1 (it) 2000-04-04
ES2195467T3 (es) 2003-12-01

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