WO1997013899A1 - Double-beam vertical loom - Google Patents
Double-beam vertical loom Download PDFInfo
- Publication number
- WO1997013899A1 WO1997013899A1 PCT/EP1996/004413 EP9604413W WO9713899A1 WO 1997013899 A1 WO1997013899 A1 WO 1997013899A1 EP 9604413 W EP9604413 W EP 9604413W WO 9713899 A1 WO9713899 A1 WO 9713899A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- loom
- vertical
- weaving
- movement
- yarn
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
- D03D41/007—Vertical looms
Definitions
- the present invention relates to a vertically arranged weaving loom, i.e. to a loom in which the weaving plane formed by the warp yarns lies vertically or sub-vertically.
- the invention relates to a vertical loom of the abovementioned type which is able to weave at the same time a double cloth and hence is provided with a double warp beam and a double cloth beam.
- the present invention has been developed precisely on the basis of a detailed analysis of the problems briefly outlined above, including both those of a strictly mechanical nature and those relating to the functionality of the machine from the point of view of the weaving operator, with the aim of developing a weaving machine which is able to exploit the hitherto untapped potential of vertical weaving looms and is thus suitable for use in the area of high- or very high-capacity production of fabrics with a relatively simple pattern, such as cloths for sheets, mattresses and the like.
- said drive mechanism comprises a single control CPU, and a single motor/clutch unit driving in a synchronized way two transmission units, each apt to move a respective sley, and a single weave forming machine apt to control the movement of said two sets of heald frames.
- Fig. 1 is a schematic overall side view of a preferred embodiment of the double-beam vertical loom according to the present invention
- Fig. 2 is a front view of the loom shown in Fig. 1
- Fig. 3 is a schematic cross-sectional view of the weft insertion zone, showing the dimensions of the weft launching channel in conventional looms and in the loom of the present invention
- Figs. 4 and 5 are schematic plan views showing, respectively, the space occupied, inside a typical weaving room, by conventional horizontal looms and by vertical looms according to the present invention (all the measurements being expressed in mm).
- Fig. 1 it is possible to clearly see the various parts which form the loom according to the present invention.
- the body of the loom is formed by a strong central frame 1 which has mounted on either side of it the single devices forming two complete weaving lines, which are arranged opposite each other and perfectly symmetrical with respect to a central vertical plane of symmetry.
- the loom also comprises a drive mechanism consisting of a single control CPU (not shown), a single main motor/clutch unit M, and two twin transmission units T, which are both connected to the motor/clutch unit and are apt to transmit the movement thereof to a respective sley, through a cam system apt to transform the rotary movement of the motor/clutch unit M in the alternately movement of the sley.
- a drive mechanism consisting of a single control CPU (not shown), a single main motor/clutch unit M, and two twin transmission units T, which are both connected to the motor/clutch unit and are apt to transmit the movement thereof to a respective sley, through a cam system apt to transform the rotary movement of the motor/clutch unit M in the alternately movement of the sley.
- said two transmission units are housed in one single gear box, with the advantage of having only one common lubrication system, each transmission unit being positioned respectively at the left and right side of a central gear wheel and mated therewith, said central gear wheel being in turn driven by said motor/clutch unit M.
- one of said transmission units is also apt to transmit the movement of the motor/clutch unit M to a weave forming machine A, while the other transmission unit is apt to transmit the movement to two identical transmission units (not shown in the drawings) positioned on the other side of the loom.
- two identical transmission units not shown in the drawings
- the weft insertion system which is of the conventional, preferably air type, is not shown.
- the double beam loom according to the present invention may be equipped with weft insertion devices both of the gripper and air or water type, it is able to make best use of its potential precisely with an air-type weft insertion system, to which exclusive reference will be made below, without thereby the invention necessarily being understood as limited thereto.
- the structure of the double-beam loom according to the present invention extends in the vertical direction, with the warp beams 2 arranged in the bottom part of the machine and the cloth beams 8 arranged along the vertical of the beams 2, above the frame 1 and resting on the latter by means of pairs of motor-driven rollers 9 and 10, which allow winding of the fabric onto the cloth beam
- the winding roller 9 has a speed of rotation slightly greater than that of the take-up cylinder 7 and is provided with a suitable friction device, so as to keep the fabric arriving onto it at the desired degree of tensioning.
- the pushing roller 10 has a speed of rotation slightly greater than that of the winding roller 9 and is provided with its own adjustable friction device, thus allowing, owing to suitable calibration of the friction device, the required degree of tensioning of the cloth beam 8 to be achieved.
- the conventional system which comprises a carrier drive roller, coaxial with the beam 8, which is pivotably hinged in a fixed position on the frame 1 , as illustrated in Fig. 2.
- the warp beams 2, take-up cylinders 7 and rollers 9 and 10 can be moved by the same main motor/clutch unit 7, but are preferably equipped with independent motor units, electronicaly controlled to maintain the desired travelling speed and tensioning of the fabric.
- the weaving zone comprised between the yarn-pulling bar 1 1 and the reed 5 extends in a vertical or sub-vertical plane and consequently the heald frames 4 lie in a horizontal or near-horizontal plane.
- the individual heald frames are in fact arranged on top of one another and make mutual contact via plates of anti-friction material mounted thereon; the heald frames are then kept laterally in the required position by means of common lateral guides.
- This arrangement besides making the frame guiding system more streamline, also enables the said frames to be made with a much more economical and lightweight structure, besides facilitating and speeding up considerably engagement and disengagement thereof from the loom.
- the maximum number of heald frames for each weaving line is preferably a low number, for example from four to a maximum of eight heald frames per line. From a first point of view, this number of heald frames is in fact entirely sufficient for the type of fabrics for which the loom according to the present invention has been specifically designed. From a second point of view, with such a small number of heald frames it is possible to provide a symmetrical and very compact geometry for the shed inlets, reducing the extent of travel of the sley and of the heald frames and correspondingly the tension imparted to the warp yarns during opening of the shed.
- the reduced travel of the heald frames also contributes to a reduction in the stresses occurring thereon, due to the accelerations of their alternating movement and consequently makes it possible to adopt more streamline and lighter structures for the frames, with the advantage of a reduction in the power consumption associated with their movement.
- the reduction in the travel of the frames results in a corresponding reduction in the cross-sectional area of the inlets comprised between the reed and the fabric forming line which, when the inlets are completely open, is preferably about 40/60% less than the similar cross-section in ordinary horizontal looms, as schematically illustrated in Fig. 3, in which the simply shaded zone indicates the cross-sectional area of the inlets for conventional looms, while the cross-hatched area indicates the corresponding area for the loom according to the invention.
- the movement to the heald frames 4 is imparted by a lever control system, operated by a single weave machine A located at one of the two ends of the loom.
- This system forms the subject-matter of the jointly pending Italian patent application No. MI95A002080, the contents of which are understood as being incorporated herein for the sake of reference.
- Said control system functions such as to cause symmetrical movements of the corresponding heald frames on the two opposite weaving lines.
- the loom is designed to weave identical fabrics both on one side and on the opposite side of the loom, even though obviously different yarns or different weft or warp densities may be used during formation of the fabrics on the two sides of the loom.
- the movement is transmitted to the sley, and hence to the reed 5, by the aforementioned transmission units T, each of which comprises a cam system for transmission of the movement, instead of the more conventional system of connecting rods and cranks.
- This makes it possible to modify with great ease, i.e. merely by replacing the cams, the movement cycle of the reed.
- said movement cycle comprises an inactive period during the part of the cycle wherein the weft is inserted into the open shed, so as to allow easy and correct insertion of the weft when the above-described geometrical arrangement of the shed inlets - characterized by a shorter travel distance of the frames and hence a smaller cross-sectional area of the shed itself - is adopted.
- the particular structure of the loom according to the present invention which is at the same time simple, compact and extremely accessible, has enabled the inventor to provide a loom cleaning system with removal of the tufts of dust which continuously form in the parts of the loom underlying the weaving zone and the zone of the warp stop device.
- This cleaning system can replace the system currently used in weaving rooms consisting of travelling cleaning devices, and therefore eliminate the main disadvantages thereof, such as: the creation of dust in the environment; the removal of only that part of the dust which is situated outside the looms, leaving unaffected the dust which instead becomes lodged in the internal parts thereof; the use of considerable volumes of humid ambient air causing the tackiness of the tufts.
- Said cleaning system is described in detail in the jointly pending Italian patent application No. MI95A002081 , the contents of which are understood as being incorporated herein for reference.
- the yarn- pulling bar 1 1 has preferably a small diameter (of the order of a few centimetres, preferably 2 cm) so as to leave ample space for the weaving operator to freely operate during the loom setting-up operation; to ensure that the bar is sufficiently rigid, said bar is provided with a certain number of supports, or, alternatively, it is made of materials with a high rigidity such as, for example, carbon fibres.
- a first obvious advantage consists in the extraordinary saving in the amount of space occupied by the loom for the same production output, or, from another point of view, the considerable increase in productivity per unit of surface area allocated for installation of the looms.
- the space occupied on the horizontal plane by the loom according to the present invention is in fact only 10% more than that of an ordinary loom, with a productivity, however, which is doubled and hence increased by 100% . There is therefore an increase in productivity per individual machine, for the same space occupied, of more than 80% .
- a second notable advantage lies in the fairly high stability of the loom, a stability which is derived from its perfectly symmetrical structure, both from the point of view of the location of the individual components, and from the point of view of movement of the moving parts.
- all the parts which perform an alternating movement, and in particular the lever mechanism operating the heald frames and the heald frames themselves move simultanously in more or less opposite directions (it must not be forgotten that the heald frames lie horizontally or almost horizontally) and therefore balance each other. This makes it possible to achieve a drastic reduction in the vibrations and consequently a greater stability of the loom even at very high operating speeds.
- a positive consequence of the stability of the novel loom and the significant reduction in the vibrations due to the alternating masses in movement is also the reduction in noisiness.
- a fourth advantage consists in the low cost of manufacturing the loom according to the invention.
- this loom in fact, many components are single component and are simultaneously used for the two opposite weaving lines.
- the control systems serving the two weaving lines are entirely identical and it is therefore possible to duplicate them, either mechanically (for the drive mechanism and weave machine) or electronically (for the control CPU), so as to obtain the desired operation of the entire loom.
- the overall cost of the loom is only about 50% greater than that of a conventional loom, thus achieving from this point of view as well an extremely interesting result.
- a fifth advantage is obtained in relation to the energy consumption.
- the reduction in the number of moving parts involved, compared to those existing in two conventional horizontal looms, their symmetrical and hence balanced movement, and finally the reduction in the distance traveled by the heald frames and the reeds make it possible to use a main motor with a power and hence consumption less than the consumption of the two motors of two corresponding conventional looms.
- the aforementioned reduction of up to 40-60% of the cross-sectional area of the inlets forming the shed makes it possible to reduce considerably the volume of the weft yarn launching channel, thus resulting in a considerable saving also in the amount of compressed air used for insertion of the weft.
- a sixth advantage depends on the position and the operation of the cloth beams.
- these beams are located in the top part of the machine and, in a preferred embodiment, they are made to rotate not as occurs in conventional looms, by causing their axis to rotate, but instead by arranging them so that they rest on the pair of rollers 9 and 10 which are driven at different speeds.
- Another advantage arises from the fact that the cloth is driven at its periphery and not in the centre; it is therefore no longer necessary to gradually reduce the speed of winding of the beam as its diameter increases, with the advantage of a greater simplicity of the machine; as a result of the different speeds of rotation of the two rollers 9 and 10, it is also possible to obtain a more uniform packing of the fabric during winding.
- a further advantage consists in the fact that the operation of removing the full cloth beams and installing the corresponding empty beams may be performed from above, for example with a bridge crane, without therefore interrupting the weaving operations or hindering the movement of the weaving operators around the looms, a fact which contributes to an increase in the efficiency and productivity of the loom according to the present invention.
- a seventh advantage depends, finally, on the particular relative spatial arrangement of the yarn-guiding bar 3 and the yarn-pulling bar 1 1 described above. Since, in fact, the compensating movement of the yarn-pulling bar 1 1 , during opening and closing of the shed, occurs parallel to the direction of the weaving plane (arrow F), this movement is substantially perpendicular to the section of warp yarns comprised between the yarn-pulling bar 1 1 and the yarn-guiding bar 3. Since it is precisely in this section that the warp stop device 12 is installed, there are three important advantages of this arrangement.
- a second advantage is obtained, on the other hand, owing to the fact that the albeit smaller quantity of dust which forms in the region of the drop wires of the warp stop device, or which is conveyed into the vicinity thereof, is easily detached from said wires as a result of the beating movement of the warp yarns caused by displacement of the yarn-pulling bar 1 1 in the direction of the arrow F and falls into the underlying zone where it is immediately collected by the automatic cleaning system described in the aforementioned patent application.
- the loom according to the present invention has in fact been developed precisely with a view to achieving a marked improvement, from an ergonomic point of view, in the position of the operator, designed to achieve a marked reduction both in the loom preparation and/or repair times and the fatigue of the operator.
- a first advantage consists in the possibility, not present in conventional machines, of the operator being able to monitor all the working zones from a single position.
- he has the entire weaving line in front of him, from the warp beam to the cloth-winding beam, while in the case of conventional machines on one side (rear side) he is able to monitor only the warp beam, while on the other side (front side) he is able to monitor only the weaving zone.
- a second advantage arising directly from the previous one, is the possibility of performing repair of the broken warp yarn in a single operation and on one side only of the loom, rather than in two stages, interrupted by displacement of the operator from one side of the frame to the other, as instead occurs in conventional machines.
- a third advantage consists in the more comfortable position of the operator during each type of maintenance or repair operation involving the yarns and loom.
- the loom according to the present invention he is in fact always in an erect or semi-erect position, with the working zone at a very short distance and at a comfortable height, seen the particular position of the weaving zones, soon above the warp beams 2 * .
- the operator in conventional looms, the operator must assume very uncomfortable positions during the various repair operations involving the warp yarns, bending forwards towards the centre of the loom with inclination of the top part of the body by as much as 40° or 50° with respect to the vertical.
- a fourth advantage consists in the extraordinary compactness of the looms according to the present invention.
- a worker supervising 32 conventional machines illustrated in Fig. 4 must monitor a rectangular zone of the room, the most distant points of which lie at about 36.56 m from each other (Fig. 4). This distance therefore represents the distance which the operator must cover in order to monitor the machines assigned to him.
- this distance becomes much smaller, being equivalent to about 20.22 m. It is obvious, therefore, that that portion of the fatigue which the operator is subject to as a result of walking around inside the area of the weaving room monitored by him, will be reduced by more than 40%, with an extraordinarily positive result therefore.
- the two yarn feeding systems necessary for operation of the loom according to the present invention are normally arranged at the opposite ends of the loom, i.e. usually on the left of each respective weaving line; with this arrangement, in fact, perfect symmetry is achieved between the two opposite weaving lines, with an identical fabric forming process on both sides of the loom.
- the lateral dimensions need to be further reduced at one of the two ends of the loom, to arrange the yarn feeding systems both on the same side of the loom. In order to do so, it is merely necessary to reverse the feeding direction of the secondary nozzles in one of the two weaving lines and obviously also the position of the individual loom accessories associated with the weft insertion operation.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96934626A EP0854944A1 (en) | 1995-10-12 | 1996-10-10 | Double-beam vertical loom |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI95A002079 | 1995-10-12 | ||
IT95MI002079A IT1276917B1 (en) | 1995-10-12 | 1995-10-12 | VERTICAL DOUBLE SUBBI FRAME |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997013899A1 true WO1997013899A1 (en) | 1997-04-17 |
Family
ID=11372342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/004413 WO1997013899A1 (en) | 1995-10-12 | 1996-10-10 | Double-beam vertical loom |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0854944A1 (en) |
IT (1) | IT1276917B1 (en) |
WO (1) | WO1997013899A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006075961A1 (en) * | 2005-01-17 | 2006-07-20 | Tape Weaving Sweden Ab | Method and apparatus for weaving tape-like warp and weft and material thereof |
US8129294B2 (en) | 2005-01-17 | 2012-03-06 | Tape Weaving Sweden Ab | Woven material comprising tape-like warp and weft, and an apparatus and method for weaving thereof |
US10145037B2 (en) | 2016-01-28 | 2018-12-04 | Nike, Inc. | Multi-carrier, zonal weaving system, method, and material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR988490A (en) * | 1948-07-27 | 1951-08-28 | Multi-production weaving machine | |
CH435145A (en) * | 1962-10-31 | 1967-04-30 | Tubau Quintana Jean | Loom |
WO1984004763A1 (en) * | 1983-05-30 | 1984-12-06 | Reyes Juan Vila | Loom |
-
1995
- 1995-10-12 IT IT95MI002079A patent/IT1276917B1/en active IP Right Grant
-
1996
- 1996-10-10 EP EP96934626A patent/EP0854944A1/en not_active Ceased
- 1996-10-10 WO PCT/EP1996/004413 patent/WO1997013899A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR988490A (en) * | 1948-07-27 | 1951-08-28 | Multi-production weaving machine | |
CH435145A (en) * | 1962-10-31 | 1967-04-30 | Tubau Quintana Jean | Loom |
WO1984004763A1 (en) * | 1983-05-30 | 1984-12-06 | Reyes Juan Vila | Loom |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006075961A1 (en) * | 2005-01-17 | 2006-07-20 | Tape Weaving Sweden Ab | Method and apparatus for weaving tape-like warp and weft and material thereof |
US7992596B2 (en) | 2005-01-17 | 2011-08-09 | Tape Weaving Sweden Ab | Method and apparatus for weaving tape-like warp and weft and material thereof |
US8129294B2 (en) | 2005-01-17 | 2012-03-06 | Tape Weaving Sweden Ab | Woven material comprising tape-like warp and weft, and an apparatus and method for weaving thereof |
US10145037B2 (en) | 2016-01-28 | 2018-12-04 | Nike, Inc. | Multi-carrier, zonal weaving system, method, and material |
Also Published As
Publication number | Publication date |
---|---|
EP0854944A1 (en) | 1998-07-29 |
ITMI952079A1 (en) | 1997-04-12 |
IT1276917B1 (en) | 1997-11-03 |
ITMI952079A0 (en) | 1995-10-12 |
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