Patent Application
20080230138
The invention relates to a method for the production of a velvet ribbon with a double-sided nap, a ribbon weaving machine for carrying out said method, and a velvet ribbon thus produced.
It is known from CH 554 431 to produce velvet ribbons on a shuttleless ribbon weaving machine, two webs being produced which lie one above the other at a distance and are connected to one another by means of nap threads. The nap threads are severed at half the distance between the individual webs, and two velvet ribbons having a nap on the one side are obtained. The publication contains no indications as to the possibility of producing a double-sided velvet ribbon.
The object of the invention is to specify a method for production of a double-sided velvet ribbon and a ribbon weaving machine for carrying out such a method and also to provide a double-sided velvet ribbon produced according to the method and on the ribbon weaving machine.
The object is achieved, according to the invention, by means of:
a) a method for production of a velvet ribbon;
b) a ribbon weaving machine for carrying out said method; and
c) a velvet ribbon.
Since three webs lying one above the other at a distance from one another are woven and are connected to one another by means of nap threads, a middle web, which has nap threads on both sides and an upper and a lower web, in each case provided with a nap on one side only, are obtained. First, at a first cutting device, the nap threads are cut through between the middle web and a first web, and then, at a second cutting device, the nap threads are severed between the middle web and the second web. The middle web then provides the desired two-sided velvet ribbon, while the upper and the lower web are discharged as waste.
Various methods are suitable for production; a particularly advantageous method is where the triple web is produced on a needle ribbon weaving machine. It is conceivable for the triple web to be further processed independently of the ribbon weaving machine; it is more advantageous, however, if the cutting of the nap threads is carried out immediately after weaving on the ribbon weaving machine. It is basically possible to carry out the cutting of the nap threads by means of two cutting devices which are independent of one another and which are arranged in succession. It is more advantageous if the first and the second cutting device are arranged next to one another, the web, once cut, having to be returned from the first cutting device to the second cutting device. This makes it possible to have a simple and particularly short form of construction of the cutting device.
The ribbon weaving machine for production of the ribbon has three weaving stations lying one above the other and at a distance from one another, each with a weft insertion member and a shedding device for opening three sheds and for laying nap threads connecting the weaving stations. The weaving stations are followed by a first cutting device for cutting the nap threads between the middle web and a first web and by a second cutting device for cutting the nap threads between the middle web and the second web.
In order to make it possible to cut the nap threads exactly to a specific nap height, it is advantageous if guides for the web, which are adjustable in the level and/or in the distance from one another, are arranged in each case at the cutting devices.
A ribbon weaving machine is particularly advantageous, the first and the second cutting device being arranged next to one another, and the first cutting device being assigned deflection means for returning the web to the second cutting device. This makes it possible to assign a common cutting member to both cutting devices. In this case, the cutting member may be designed as a cutting knife driven back and forth. A cutting member which is designed as a rotating cutting band is also possible. Expediently, the cutting members are assigned a grinding device, as is known from CH 554 431.
The cutting devices are assigned in each case a discharge device for discharging the separated web which, as a rule, is removed as waste.
Various ribbon weaving machines are suitable for carrying out the method, but, a needle ribbon weaving machine with three weft insertion needles arranged one above the other is particularly advantageous.
The novel double-sided velvet ribbon produced makes it possible to have novel and improved applications.
Exemplary embodiments of the invention are described in more detail below with reference to diagrammatic drawings in which:
The weaving stations 31 are followed by a first cutting device 36 having a guide 38 and a cutting member 40 which severs the nap threads 14a between the middle web 8 and the upper web 12. The upper web 12 is discharged as waste by means of a discharge device 42 which has a needle roller 44. The first cutting device 36 is followed by a second lower cutting device 46 which likewise has a guide 48 and a cutting member 50. It severs the nap threads 14b between the middle web 8 and the lower web 10. The lower web 10 is discharged as waste by means of a discharge device 52 which again has a needle roller 54. The remaining middle web 8 has a two-sided nap 56, 58 and is discharged via a discharge device 60. This, too, preferably has a needle roller 62 which is fitted with needles 64 for the reliable discharge of the velvet ribbon 8 produced.
The triple web 8, 10, 12, from the weaving station 31 is supplied, downstream of a first guide 70, to a first cutting device 36a which has two guide plates 72, 74. The lower guide plate 72 is fixed and the upper guide plate 74 is adjustable in its distance from the lower guide plate 72 by means of an actuating device 76 indicated. At the first cutting device 36a, the cut-off lower web 10 is discharged downward by means of a discharge device 42a and a corresponding needle roller 44a.
The middle web 8, with the upper web 12 lying above it, is supplied, offset laterally, to a first deflecting roller 78 which is designed as a needle roller and which deflects it rearward and, further, is supplied, offset laterally, via a first fixed guide 80 to a second straightening guide 82, at which it is deflected until it is oriented parallel to the triple web 8, 10, 12. It is supplied via two further deflecting rollers 84, 86 to the second cutting device 46a. This has, in turn, a lower guide plate 88 and an upper guide plate 90 which are adjustable in height and/or in the distance between one another by means of actuating devices 92, 94 indicated. In particular, the lower guide plate 88 of the second cutting device 46a must be set with respect to the guide plates 72 of the first cutting device at a height such that the middle web 8 has the same nap height on both sides, since the same cutting member 66 is used for both cutting devices 36a, 46a, but the thickness of the webs including the nap height, is different. At the second cutting device 46a, the upper web 12 is separated from the middle web 8. The upper web 12, in turn, is removed as waste by the discharge device 52a having the needle roller 54a. The middle web 8 is discharged as a double-sided velvet ribbon, with a nap 56, 58 on both sides, by means of a discharge device 60 which again contains a needle roller 62.
In the present exemplary embodiment, the deflecting roller 78 of the deflection device and the needle roller 54a of the discharge device 52a are formed in one piece. The needle roller 44a of the discharge device 42a is likewise in one piece with the needle roller 62a of the discharge device 60a.
The needle rollers illustrated may individually or all be replaced by other rollers having surfaces with a sufficiently good grip, such as, for example, those which have a roughened surface or are provided with a rubber clothing.
The upper or lower webs which, as a rule, are discharged as waste may, if appropriate, also be used as one-sided velvet ribbons.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1431/05 | Sep 2005 | CH | national |
This application claims priority of PCT application PCT/CH2006/000144 having a priority date of Sep. 2, 2005, the disclosure of which is incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/CH2006/000144 | 3/9/2006 | WO | 00 | 2/14/2008 |
