EP0799919B1 - Device for carrying out the programming of rotary dobbies in weaving machines - Google Patents
Device for carrying out the programming of rotary dobbies in weaving machines Download PDFInfo
- Publication number
- EP0799919B1 EP0799919B1 EP97105168A EP97105168A EP0799919B1 EP 0799919 B1 EP0799919 B1 EP 0799919B1 EP 97105168 A EP97105168 A EP 97105168A EP 97105168 A EP97105168 A EP 97105168A EP 0799919 B1 EP0799919 B1 EP 0799919B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lever
- operating means
- selection
- engagement
- disc
- 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.)
- Expired - Lifetime
Links
- 238000009941 weaving Methods 0.000 title claims description 8
- 230000002441 reversible effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C1/00—Dobbies
Definitions
- the present invention relates to an improved device for carrying out the programming of rotary dobbies for the operation of heald frames in weaving machines.
- the operating and control device for each stoppage of the main shaft, must be able to make the rotating shaft integral or not with an eccentric cam or similar device actuating the frame moving levers, resulting, in one case, in the change of position thereof and, in the other case, in the previous position being maintained.
- the dobbies which operate the heald frames in weaving looms must therefore be controlled by means of special devices for carrying out the programming, which are designed to produce, by means of special actuators, the variation in the relative positions of the operating means which, in turn, vary the position of the frames.
- This device intended for rotary dobbies of the type in which the heald frame operating rods are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said lever via one of its end teeth, through the action of a spring, comprises an operating lever rotating about a fixed fulcrum owing to the action of thrusting means and in opposition to spring-type recall means, so that the projecting end profiles of the same operating lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid engagement thereof with the rotating disc, the rotation of the operating lever being performed during rotation of the main shaft.
- one of the projecting end profiles of said operating lever is formed as a tooth pivotably hinged on the corresponding end of said lever, inside a recess having two diverging abutment walls, and kept in contact with one of them by a spring, so as to be able to oscillate until it makes contact with the other one so as to phase-displace the active engagement with said selection lever, in the condition of backwards movement of the dobby, and, correspondingly, the spring acting on the selection lever and the one acting on the toothed profile of the operating lever are dimensioned so that the action of the former cannot be exceeded by the action of the latter.
- the present invention therefore relates to a device for carrying out the programming of rotary dobbies for the operation of the heald frames in weaving machines, of the type in which the heald frame operating levers are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said disc via one of its end teeth, through the action of a spring, said device comprising operating means which are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever for causing or avoiding the engagement thereof with the rotating disc, the action of said operating means being co-ordinated with the rotation of the main shaft, characterized in that said operating means comprise at least one electric linear stepper motor.
- said operating means comprise a toggle lever rotating with its middle point about a fixed fulcrum so that projecting end profiles of the said lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid the engagement thereof with the rotating disc and an electric linear stepper motor which controls rotation of said lever in both directions.
- said operating means comprise two projections which are designed to engage with the end of the selection lever opposite to the toothed end and are arranged angularly spaced, and two electric stepper motors which control the engagement of said projections with said selection levers so as to cause or avoid engagement of the toothed end of the latter with the rotating disc.
- the device according to the invention forms part of a dobby which comprises a rotating shaft 1 which has keyed onto it a connecting-rod element 2 shaped so as to have a projection 2A pivotably hinged at 3A with the operating rod 3 of heald frames 2B (not shown) and a substantially circular ring 2B which has two rollers 2C in opposite positions.
- the centre of the connecting rod 2 has inserted inside it a bearing 4, the inner ring of which has mounted on it an eccentric cam 5 which is able to rotate, as can be seen further below, with respect to the shaft 1.
- the eccentric cam 5 has mounted on it in an oscillating manner, by means of a rivet 6 or the like, a rocker lever 7, or selection lever, which has shaped ends 8 and 9 and, on its inner side, a tooth 11 opposite to the end 9.
- a spring 12 arranged between the eccentric cam 5 and the end 9 of the lever 7 exerts a recall action on the lever 7 itself and thus tends to cause it to rotate so as to move the tooth 11 towards the axis of rotation of the shaft 1.
- said shaft 1 has keyed onto it a disc 13, at the periphery of which there are formed two grooves 13A and 13B arranged diametrically opposite with respect to the centre of rotation of the disc 13 itself and which is located on the axis of the shaft 1.
- the disc 13 has keyed onto it the inner ring of a bearing, the outer ring of which has keyed onto it the eccentric cam 5 for thus rotating about the shaft 1.
- the disc 13 lies in the same position as the lever 7, such that the tooth of the latter is able to engage with one of two notches 13A or 13B and be disengaged therefrom.
- the dobby is completed by an elbow-shaped operating lever 14, the ends of which have shaped projecting profiles 14A and 14B formed as one piece.
- the operating lever 14 is able to oscillate, being mounted with its middle point about a fulcrum 14C, so as to assume different positions in which its shaped end profiles 14A and 14B are able to engage with or not engage with the end (8) of the selection levers (7) opposite to the toothed end (11).
- the positions of the lever 14 are controlled by an electric stepper motor 15 shown acting in the vicinity of the end 14A of the lever 14, inside a suitable seating 14D thereof, so as to cause oscillations thereof positively controlled in both directions of rotation.
- the dobby no longer has the operating lever 14, but a pair of projections 16 and 17 arranged, at a considerable angular distance from one another, so as to be able to engage directly with the end 8 of the selection lever 7 opposite to the toothed end 11 under the control of two electric linear stepper motors, 18 and 19 respectively.
- eccentric cam 5 is integral with the rotating disc 13 which, rotating with the shaft 1 during the next half-turn, causes rotation with it of the eccentric cam 5 itself and hence the connecting rod 2 which, rotating, drives the frame operating rod 3, causing it to change position.
- the motor 15 carries out the control for the next half-turn, i.e. in the example in question so as to keep the frame in the previous position. It therefore exerts a pressure against the end 14A of the lever 14 so as to cause anti-clockwise rotation of the same lever 14, which brings the profile 14B thereof into contact with the rear surface of the end 8 of the lever 7, which lever in the meantime has moved into a position opposite the end 14B of the lever 14.
- the said lever 7 is thus obliged, continuing the rotation of the disc 13, to rotate about its own pin 6, causing the gradual emergence of the tooth 11 provided at the end faced by the recess 13A of the disc 13.
- the eccentric cam 5 thus remains idle with respect to the disc 13, this causing the previous position of the heald frame controlled by the lever 3 to be maintained during the next half-turn, as desired.
- the present invention ensures in a fairly convenient manner precise and reliable selection of the position of the heald frames, without it being necessary to stop rotation of the shaft at each half-turn, thus avoiding any possible jamming during this stage and allowing independent selection of the frames both during forwards movement and during reverse movement, at even very high dobby speeds, with important advantages in terms of the productivity of the weaving machine with which it is associated.
Description
- The present invention relates to an improved device for carrying out the programming of rotary dobbies for the operation of heald frames in weaving machines.
- It is known that the positioning of the heald frames of a weaving machine or loom, from which the configuration of the weft of the finished fabric is obtained, must be programmed in a predetermined sequence which defines the position which each frame must assume upon each rotation of the main shaft, this generating the controls for the oscillating devices which operate the frames themselves, so as to obtain for them one of the two-high or low - positions required.
- Since the main shaft of the dobby is operated in accordance with an intermittent cycle, with the dead centre at each half-rotation through 180°, the operating and control device, for each stoppage of the main shaft, must be able to make the rotating shaft integral or not with an eccentric cam or similar device actuating the frame moving levers, resulting, in one case, in the change of position thereof and, in the other case, in the previous position being maintained. The dobbies which operate the heald frames in weaving looms must therefore be controlled by means of special devices for carrying out the programming, which are designed to produce, by means of special actuators, the variation in the relative positions of the operating means which, in turn, vary the position of the frames.
- It is already known in the art of devices for carrying out the programming of the dobbies, which, however, have numerous drawbacks, including the need to stop the shaft at each half-turn, so as to have the time necessary for clearing the previous programming operation and entering a new one for the next half-turn. It is obvious how the programming devices of this type cause an increase in the idle time of the machine, to the detriment of the useful working time.
- Another type of drawback which may be encountered in the devices of the known type involving a single control with times for pressing of the operating levers synchronised with the middle of the movement diagram, both for forwards movement and for reverse movement, consists in the high probability of errors during selection of the movement in a clockwise or anti-clockwise direction, it being indispensable, moreover, with said devices, to perform a few half-turns under zero load when it is required to locate the weft and re-establish the shed for recording purposes.
- The technical problem of providing a device for carrying out the programming of dobbies, in particular rotary dobbies for controlling weaving machines, which allows: selection of the position of the heald frames to be performed without stopping rotation of the main shaft at each half-turn; independent selection of the frames for rotation in the clockwise direction and for rotation in the anti-clockwise direction; and reduced stressing of the warp yarns, ensuring reduced stresses and forces in the dobby components, so as to allow very high working speeds and a low power consumption, has been solved with the device forming the subject of Italian Patent application No. MI95A 002037 in the name of the same Applicant. This device intended for rotary dobbies of the type in which the heald frame operating rods are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said lever via one of its end teeth, through the action of a spring, comprises an operating lever rotating about a fixed fulcrum owing to the action of thrusting means and in opposition to spring-type recall means, so that the projecting end profiles of the same operating lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid engagement thereof with the rotating disc, the rotation of the operating lever being performed during rotation of the main shaft. In the embodiment according to the aforementioned patent a mechanical solution is adopted, whereby one of the projecting end profiles of said operating lever is formed as a tooth pivotably hinged on the corresponding end of said lever, inside a recess having two diverging abutment walls, and kept in contact with one of them by a spring, so as to be able to oscillate until it makes contact with the other one so as to phase-displace the active engagement with said selection lever, in the condition of backwards movement of the dobby, and, correspondingly, the spring acting on the selection lever and the one acting on the toothed profile of the operating lever are dimensioned so that the action of the former cannot be exceeded by the action of the latter.
- It has now been discovered that, in a somewhat simpler manner, the problem of carrying out the programming of rotary dobbies of the type defined immediately above may be dealt with and solved with the use of electric operating means which are controlled electronically and capable of producing the movements of said operating lever or replacing it during its control action. Document EP 0607632 A already discloses electric operating means.
- More precisely the present invention therefore relates to a device for carrying out the programming of rotary dobbies for the operation of the heald frames in weaving machines, of the type in which the heald frame operating levers are actuated by connecting rods each mounted on an eccentric ring rotating with respect to the main shaft of the dobby, which has moreover a disc made to rotate by said shaft and a selection lever pivotably hinged on said eccentric ring and designed to engage with said disc via one of its end teeth, through the action of a spring, said device comprising operating means which are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever for causing or avoiding the engagement thereof with the rotating disc, the action of said operating means being co-ordinated with the rotation of the main shaft, characterized in that said operating means comprise at least one electric linear stepper motor.
- In a first embodiment said operating means comprise a toggle lever rotating with its middle point about a fixed fulcrum so that projecting end profiles of the said lever are arranged alternately along or outside the trajectory at the end opposite to the toothed end of the selection lever so as to cause or avoid the engagement thereof with the rotating disc and an electric linear stepper motor which controls rotation of said lever in both directions.
- In a second embodiment said operating means comprise two projections which are designed to engage with the end of the selection lever opposite to the toothed end and are arranged angularly spaced, and two electric stepper motors which control the engagement of said projections with said selection levers so as to cause or avoid engagement of the toothed end of the latter with the rotating disc.
- The invention will now be described in greater detail, with reference to two currently preferred embodiments thereof, illustrated purely by way of example by the accompanying drawings, in which:
- Fig. 1 shows a partial, schematic cross-section of a rotary dobby to which the device according to a first embodiment of the invention is applied, in the initial position of a half-turn; and
- Fig. 2 is a schematic illustration, similar to that of Fig. 1, of a second embodiment of the invention.
-
- As illustrated in the drawings, the device according to the invention forms part of a dobby which comprises a rotating shaft 1 which has keyed onto it a connecting-
rod element 2 shaped so as to have aprojection 2A pivotably hinged at 3A with theoperating rod 3 ofheald frames 2B (not shown) and a substantiallycircular ring 2B which has tworollers 2C in opposite positions. - The centre of the connecting
rod 2 has inserted inside it a bearing 4, the inner ring of which has mounted on it aneccentric cam 5 which is able to rotate, as can be seen further below, with respect to the shaft 1. - The
eccentric cam 5 has mounted on it in an oscillating manner, by means of arivet 6 or the like, arocker lever 7, or selection lever, which has shapedends tooth 11 opposite to theend 9. - A
spring 12 arranged between theeccentric cam 5 and theend 9 of thelever 7 exerts a recall action on thelever 7 itself and thus tends to cause it to rotate so as to move thetooth 11 towards the axis of rotation of the shaft 1. - Finally, said shaft 1 has keyed onto it a
disc 13, at the periphery of which there are formed twogrooves disc 13 itself and which is located on the axis of the shaft 1. - The
disc 13 has keyed onto it the inner ring of a bearing, the outer ring of which has keyed onto it theeccentric cam 5 for thus rotating about the shaft 1. - The
disc 13 lies in the same position as thelever 7, such that the tooth of the latter is able to engage with one of twonotches - In the embodiment shown in Fig, 1, the dobby is completed by an elbow-
shaped operating lever 14, the ends of which have shapedprojecting profiles operating lever 14 is able to oscillate, being mounted with its middle point about afulcrum 14C, so as to assume different positions in which its shapedend profiles - According to the invention, the positions of the
lever 14 are controlled by anelectric stepper motor 15 shown acting in the vicinity of theend 14A of thelever 14, inside asuitable seating 14D thereof, so as to cause oscillations thereof positively controlled in both directions of rotation. - In the embodiment shown in Fig. 2, the dobby no longer has the
operating lever 14, but a pair ofprojections end 8 of theselection lever 7 opposite to thetoothed end 11 under the control of two electric linear stepper motors, 18 and 19 respectively. - Operation of the dobby with reference to its embodiment shown in Fig. 1 is now described: at the start of the half-turn of the shaft 1 (Fig. 1A) and assuming forwards movement and that programmed has been performed with a view to varying the position of the frame, the
motor 15 keeps thelever 14, with itsend 14A outside the trajectory of theend 8 of thelever 7, thus leaving the rocker selection lever 7 subject to the recall action of thespring 12, with thetooth 11 engaged in therecess 13A. - In this situation the
eccentric cam 5 is integral with the rotatingdisc 13 which, rotating with the shaft 1 during the next half-turn, causes rotation with it of theeccentric cam 5 itself and hence the connectingrod 2 which, rotating, drives theframe operating rod 3, causing it to change position. - Before the half-turn has been completed, the
motor 15 carries out the control for the next half-turn, i.e. in the example in question so as to keep the frame in the previous position. It therefore exerts a pressure against theend 14A of thelever 14 so as to cause anti-clockwise rotation of thesame lever 14, which brings theprofile 14B thereof into contact with the rear surface of theend 8 of thelever 7, which lever in the meantime has moved into a position opposite theend 14B of thelever 14. The saidlever 7 is thus obliged, continuing the rotation of thedisc 13, to rotate about itsown pin 6, causing the gradual emergence of thetooth 11 provided at the end faced by therecess 13A of thedisc 13. - Once the dead centre of the half-turn has been reached (Fig. 2A), the
selection lever 7 is totally rotated outwards and engaged with theroller 2C, while thetooth 11 is totally extracted from therecess 13A. - The
eccentric cam 5 thus remains idle with respect to thedisc 13, this causing the previous position of the heald frame controlled by thelever 3 to be maintained during the next half-turn, as desired. - Operation of the dobby in the case of the embodiment according to Fig. 2 is similar: in an even simpler manner than in the previous case, engagement of the
projections end 8 of theselection lever 7 occurs by means of direct controls of themotors - The corresponding operating phases of the device according to the invention in the condition of reverse movement does not require any particular illustration for the person skilled in the art, following the explanation provided for the condition of forwards movement.
- With the arrangement described and illustrated the present invention ensures in a fairly convenient manner precise and reliable selection of the position of the heald frames, without it being necessary to stop rotation of the shaft at each half-turn, thus avoiding any possible jamming during this stage and allowing independent selection of the frames both during forwards movement and during reverse movement, at even very high dobby speeds, with important advantages in terms of the productivity of the weaving machine with which it is associated.
- It is understood that other practical embodiments of the invention, different form the one described, are possible, said embodiments legitimately falling within the protective scope of the present invention, as will be obvious to persons skilled in the art.
Claims (3)
- Device for carrying out the programming of rotary dobbies for the operation of the heald frames in weaving machines, of the type in which the heald frame operating levers (3) are actuated by connecting rods (2) each mounted on an eccentric ring (5) rotating with respect to the main shaft (1) of the dobby, which has having moreover a disc (13) made to rotate by said shaft (1) and a selection lever (7) pivotably hinged on said eccentric ring (5) and designed to engage with said disc (13) via one of its end teeth (11), through the action of a spring (12), said device comprising operating means which are arranged alternately along or outside the trajectory at the end (8) opposite to the toothed end (11) of the selection lever (7) for causing or avoiding the engagement thereof with the rotating disc (13), the action of said operating means being co-ordinated with the rotation of the main shaft, characterized in that said operating means comprise at least one electric linear stepper motor (15, 18, 19).
- Device according to Claim 1, characterized in that said operating means comprise a toggle lever (14) rotating with its middle point about a fixed fulcrum (14C) so that projecting end profiles (14A, 14B) of the same lever (14) are arranged alternately along or outside the trajectory at the end (8) opposite to the toothed end (11) of the selection lever (7) so as to cause or avoid the engagement thereof with the rotating disc (13) and an electric linear stepper motor (15) which controls the rotation in both directions of said lever (14).
- Device according to Claim 1, characterized in that said operating means comprise two projections (16, 17) which are designed to engage with the end (8) of the selection lever (7) opposite to the toothed end (11) and are arranged angularly spaced, and two electric stepper motors (18, 19) which control the engagement of said projections with said selection levers (7) in order to cause or avoid engagement of the toothed end (11) of the latter with the rotating disc (13).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT96MI000657A IT1283717B1 (en) | 1996-04-04 | 1996-04-04 | DEVICE TO IMPLEMENT THE PROGRAMMING OF ROTARY DOBBIES IN WEAVING MACHINES. |
ITMI960657 | 1996-04-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0799919A1 EP0799919A1 (en) | 1997-10-08 |
EP0799919B1 true EP0799919B1 (en) | 2001-08-08 |
Family
ID=11373872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97105168A Expired - Lifetime EP0799919B1 (en) | 1996-04-04 | 1997-03-26 | Device for carrying out the programming of rotary dobbies in weaving machines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0799919B1 (en) |
JP (1) | JPH108343A (en) |
DE (1) | DE69705982T2 (en) |
IT (1) | IT1283717B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20010670A1 (en) * | 2001-03-29 | 2002-09-29 | Fimtextile Spa | DEVICE TO IMPLEMENT THE PROGRAMMING OF ROTARY DOBBIES FOR WEAVING MACHINES CONTAINING ELECTRIC MOTOR CONTROL VEHICLES LINE |
ITMI20022152A1 (en) * | 2002-10-10 | 2004-04-11 | Fimtextile Spa | DEVICE TO IMPLEMENT THE PROGRAMMING OF ROTARY DOBBIES FOR WEAVING MACHINES CONTAINING PERFECTED LINEAR ELECTRIC MOTOR CONTROL VEHICLES |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1243890B (en) * | 1990-11-05 | 1994-06-28 | Giobbe Srl | DEVICE FOR THE COMMAND AND CONTROL OF A ROTARY DOBBY OF TEXTILE MACHINES WITH CAM PROFILE LEVER AND RELATIVE COOPERATING CONTRAST MEANS |
IT1251107B (en) * | 1991-07-25 | 1995-05-04 | Costantino Vinciguerra | REFINEMENTS IN A HIGH-SPEED ROTARY DOBBY |
IT1260291B (en) * | 1992-12-18 | 1996-04-03 | Lucio Burigana | ROTARY DOBBY |
-
1996
- 1996-04-04 IT IT96MI000657A patent/IT1283717B1/en active IP Right Grant
-
1997
- 1997-03-26 EP EP97105168A patent/EP0799919B1/en not_active Expired - Lifetime
- 1997-03-26 DE DE69705982T patent/DE69705982T2/en not_active Expired - Lifetime
- 1997-04-01 JP JP9082681A patent/JPH108343A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
ITMI960657A0 (en) | 1996-04-04 |
IT1283717B1 (en) | 1998-04-30 |
DE69705982D1 (en) | 2001-09-13 |
DE69705982T2 (en) | 2002-04-04 |
ITMI960657A1 (en) | 1997-10-04 |
JPH108343A (en) | 1998-01-13 |
EP0799919A1 (en) | 1997-10-08 |
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