EP4269675A2 - Driving device for a shedding unit and method for adjusting a shed stroke - Google Patents
Driving device for a shedding unit and method for adjusting a shed stroke Download PDFInfo
- Publication number
- EP4269675A2 EP4269675A2 EP23196030.3A EP23196030A EP4269675A2 EP 4269675 A2 EP4269675 A2 EP 4269675A2 EP 23196030 A EP23196030 A EP 23196030A EP 4269675 A2 EP4269675 A2 EP 4269675A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive element
- crank
- axis
- swivel lever
- driving device
- 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.)
- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004590 computer program Methods 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims description 59
- 238000010168 coupling process Methods 0.000 claims description 59
- 238000005859 coupling reaction Methods 0.000 claims description 59
- 230000000903 blocking effect Effects 0.000 claims description 29
- 238000009941 weaving Methods 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C13/00—Shedding mechanisms not otherwise provided for
- D03C13/02—Shedding mechanisms not otherwise provided for with independent drive motors
- D03C13/025—Shedding mechanisms not otherwise provided for with independent drive motors with independent frame drives
Definitions
- the invention relates to a driving device for a shedding unit and a method for adjusting a shed stroke of a driving device for a shedding unit.
- the invention further relates to a computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method for adjusting a shed stroke of a driving device for a shedding unit.
- a shedding unit is defined as a unit comprising one or more driving devices, which can be drivingly coupled to heald frames of a weaving machine for moving the heald frames up and down.
- driving devices having a swivel lever with two or three arms are well known, wherein a rotating crank is coupled via a coupling rod to a first arm of the lever and the heald frame is coupled to a second arm of the lever.
- the heald frames are moved up and down with a stroke, which depends among others on the length of the crank, the length of the coupling rod, and the coupling positions of the coupling rod and the heald frame on the first arm and the second arm, respectively.
- a shed stroke of a driving device for a shedding unit is defined as the stroke imparted by the driving device on the swivel lever or any similar connection element.
- WO 2017/032556 A1 shows a shedding unit, wherein the number of driving devices of the shedding unit is the same as the number of heald frames, and each driving device is configured for moving exactly one heald frame drivingly coupled to the driving device.
- the driving devices each comprise a rotating crank, a swivel lever, and a coupling rod connecting the swivel lever with the crank, wherein the coupling rod is mounted to a first arm of the swivel lever by means of a mounting element.
- the mounting element is slidably mounted to the first arm and fixable in an adjustable mounting position at the first arm for adjusting a shed stroke of the driving device.
- JPH09-112534 A shows a driving device for a shedding unit, the driving device comprising a crank constituted by two crank elements, which are connected so that the connecting angle between the two crank elements can be changed, wherein the first crank element is concentrically mounted to a driving shaft and provided with a connecting shaft, which connecting shaft is eccentric to the driving shaft, i.e. is arranged parallel but offset to the axis of rotation of the driving shaft, wherein the second crank element is mounted to the connecting shaft, and wherein the second crank element is provided with a connecting pin for a coupling rod, which connecting pin is parallel but offset to the axis of rotation of the connecting shaft.
- the first crank element comprises a split clamping part for clamping the driving shaft and a screw bolt arranged tangentially to the driving shaft for tightening the split clamping part.
- the second crank element comprises a split clamping part for clamping the connecting shaft and a screw bolt for tightening the split clamping part.
- the connecting angle between the two crank elements is changed.
- the split clamping part of the second crank element is loosened, and the second crank element is moved relative to the first crank element.
- a driving device for a shedding unit comprising a rotationally mounted drive element, a crank, and a locking unit, wherein the drive element has an axis of rotation, a first end, and a second end, wherein the first end and the second end are distanced from each other in the direction of the axis of rotation of the drive element, wherein the drive element is provided at the second end with a seat, wherein the crank is provided with a coupling element, which coupling element cooperates with the seat for mounting the crank to the drive element so as to be rotatable about a seat axis of the seat, which seat axis is parallel but offset to the axis of rotation of the drive element, wherein for a rotation about the axis of rotation of the drive element together with the drive element, the crank is releasably lockable to the drive element in different angular positions with respect to the drive element by the locking unit, and wherein when the crank is unlocked from the drive element, for adjusting
- a rotary movement of an element about an axis is referred to as movement about an axis, wherein the movement may be less or more than a full rotation about the axis.
- the driving devices are used in a shedding unit, wherein the number of driving devices of the shedding unit is the same as the number of heald frames.
- each driving device is configured for moving exactly one heald frame drivingly coupled to the driving device.
- the driving device allows for an easy adjustment of the shed stroke.
- the drive element and the crank are referred to as first crank element and second crank element, respectively.
- the drive element and not the crank, to which a heald frame can be coupled is moved.
- a drive motor is provided, which drive motor is configured to drive the drive element so as to move about the axis of rotation of the drive element.
- the drive motor is driving the drive element to rotate about the axis of rotation together with the crank for an up and down movement of a heald frame coupled to the driving device.
- the drive motor can be used for displacing or moving the drive element by a certain angle about the axis of rotation for an adjustment of the angular position of the crank with respect to the drive element.
- the locking unit allows for an automated operation.
- the locking unit is in the form of a hydraulic expansion chuck, wherein a hydraulic pressure acting between the seat and the coupling element can be varied for locking the crank to the drive element or unlocking the crank from the drive element.
- the locking unit is in the form of a pneumatic and/or hydraulic actuable clutch.
- the locking unit comprises at least one pneumatic and/or hydraulic cylinder and a return spring, which cylinder is moveable for unlocking the locking unit by applying a pneumatic and/or hydraulic pressure.
- the locking unit is manually operable, wherein in one embodiment the locking unit is accessible for a manual operation from a first end of the drive element for locking the crank to the drive element or for unlocking the crank from the drive element.
- the shedding unit comprises a plurality of driving devices, which are arranged in two opposing groups, wherein the second ends of the drive elements of the two groups are facing towards a center of the shedding unit.
- the first ends are arranged at an outer side of the shedding unit and more easily accessible for an operator, than the second ends. This first end allows for an easy access for an operator for an adjustment of the shed stroke.
- the coupling element and the seat are arranged for locking the crank to the drive element by forcing the crank and the drive element towards each other in the direction of the seat axis, wherein the locking unit is actuable for causing a movement of the crank towards or away from the drive element in the direction of the seat axis.
- one of the coupling element and the seat is a member in the form of a truncated cone and the other one is a complementary receiving bushing.
- a conical seat connection is provided, which is backlash-free and self-centering.
- a locking and unlocking is possible by moving the coupling element a short distance with respect to the seat.
- the locking unit comprises a locking pin, which locking pin is moveably mounted to the drive element and is moveable in one direction for locking the crank to the drive element and in an opposite direction for unlocking the crank from the drive element.
- the locking pin is slidably supported.
- the locking pin is rotatably supported.
- the locking pin has an actuating end configured to receive an actuating force for moving the locking pin with respect to the drive element, which actuating end is arranged at the first end of the drive element.
- the actuating end in one embodiment is provided with a screw head for the application of a rotational movement and/or a torque.
- the locking pin is mounted to the drive element so as to be longitudinally moveable along the seat axis, wherein the crank can be coupled to the locking pin for movement with the locking pin along the seat axis, for causing a movement of the crank towards or away from the drive element in the direction of the seat axis by axial movement of the locking pin.
- the locking pin is forced in a locking position using a restoration element and is moveable against the force of a restoration element using for example a pneumatic and/or hydraulic cylinder.
- the locking unit comprises a locking pin that is mounted to or arranged in the drive element so as to be rotatable about the seat axis, wherein the locking pin is provided with an actuating end configured to receive an actuating force for moving the locking pin with respect to the drive element, and wherein the locking pin is provided with a threaded end opposite to the actuating end, which threaded end cooperates with a threaded hole of the crank for causing a movement of the crank towards or away from the drive element in the direction of the seat axis by rotating the locking pin.
- the locking pin and the crank act as a spindle drive causing a movement of the crank in the direction of the seat axis by rotating the locking pin about the seat axis.
- the coupling element is provided at a proximal end of the crank, wherein a subsequent link such as a connecting rod is coupled to a distal end of the crank, for example using a hinged joint.
- a proximal end and a distal end of a crank are defined as the regions of the crank in which the crank can be coupled to a drive element and a subsequent link, such as a connecting rod, respectively.
- the length of the crank may be chosen such that a part of the crank extends beyond the proximal end and/or the distal end.
- the distal end is not coupled to any element when adjusting a shed stroke, wherein the distal end is free to move.
- a movement of a distal end of the crank is restricted to movement along a defined path upon adjusting the shed stroke.
- a movement of the drive element about the axis of rotation of the drive element causes a defined adjustment of the angular position of the crank with respect to the drive element.
- the driving device further comprising a link coupled with its first end to the distal end of the crank by a hinged joint, wherein when the crank is unlocked from the drive element, the drive element, the crank and the link together form a planar quadrilateral linkage.
- a second end of the link can be held fixed in position while moving the drive element about the axis of rotation of the drive element, and allowing the link to rotate about the second axis, thereby restricting the movement of the distal end of the crank about the seat axis.
- the driving device further comprising a swivel lever having a first arm and a second arm, wherein the swivel lever is swivelable to-and-fro about a swivel axis between a first position associated with an upper position of a heald frame coupled to the swivel lever and a lower position associated with a lower position of the heald frame coupled to the swivel lever, a coupling rod, which is linked to the crank by a first hinged joint, wherein the coupling rod is linked to the first arm of the swivel lever by a second hinged joint, wherein for adjusting the angular position of the crank with respect to the drive element, the second hinged joint, the swivel lever and/or the heald frame coupled to the driving device is/are held in position while moving the drive element about the axis of rotation of the drive element, thereby restricting the movement of the distal end of the crank to a defined path.
- a weaving machine with such a driving device is provided.
- a method for adjusting a shed stroke of a driving device for a shedding unit comprising a rotationally mounted drive element, a crank, and a locking unit, wherein the drive element has an axis of rotation, a first end, and a second end, wherein the first end and the second end are distanced from each other in the direction of the axis of rotation of the drive element, wherein the drive element is provided at the second end with a seat, wherein the crank is provided with a coupling element, which coupling element cooperates with the seat for mounting the crank to the drive element so as to be rotatable about a seat axis of the seat, which seat axis extends parallel but offset to the axis of rotation of the drive element, wherein for a rotation about the axis of rotation of the drive element together with the drive element the crank is releasably lockable to the drive element in different angular positions with respect to the drive element by the locking unit, wherein when the crank is
- the drive element is driven to move about the axis of rotation of the drive element by a drive motor when the crank is unlocked from the drive element for adjusting the angular position of the crank with respect to the drive element.
- a movement of the distal end of the crank is restricted while moving the drive element, for example due to a link coupled to the distal end of the crank, which together with the drive element and the crank forms a planar quadrilateral linkage when the crank is unlocked from the drive element.
- a heald frame coupled to the crank is held in position while driving the drive element so as to move, in particular so as to rotate, about the axis of rotation of the drive element when the crank is unlocked from the drive element for restricting a movement of the distal end of the crank.
- the drive element for adjusting the angular position of the crank with respect to the drive element, is moved about the axis of rotation of the drive element in a direction associated with an upward movement of the heald frame coupled to the crank.
- gravitational forces acting on the heald frame coupled to the driving device can be used for holding the heald frame in position while moving the drive element when the crank is unlocked from the drive element.
- a computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method for adjusting a shed stroke of a driving device comprising a drive element and a crank by moving the drive element about its axis of rotation when the crank is unlocked from the drive element.
- the computer program further comprises instructions which, when the program is executed by the computer, cause the computer to determine a direction of rotation of the drive element associated with an upward movement of a heald frame coupled to the crank.
- the computer program further comprises instructions which, when the program is executed by the computer, cause the computer to determine a reference angular position of the crank with respect to the drive element for setting a desired stroke of the heald frame coupled to the crank.
- the computer program may further comprise instructions which, when the program is executed by the computer, cause the computer to determine a necessary movement of the drive element about the axis of rotation for achieving a relative movement of the crank with respect to the drive element into said reference angular position.
- Figs. 1 and 2 show a shedding unit 1 and a heald frame 2 of a weaving machine. Although only one heald frame 2 is visible, the weaving machine comprises a number of heald frames 2, which are guided in a frame guide (not shown) of the weaving machine and driven to move up and down.
- the shedding unit 1 comprises several driving devices 5, wherein the number of driving devices 5 in the embodiment shown is the same as the number of heald frames 2. In other words, one driving device 5 is assigned to one heald frame 2, which heald frame 2 is coupled to the associated one driving device 5.
- the shedding unit 1 comprises eight driving devices 5 according to the invention. In an alternative embodiment, a different number of driving devices may be provided, for example a number of sixteen driving devices as shown in WO 2017/032556 A1 .
- a shedding unit 1 having a number of driving devices 5 can also be used for driving a number of heald frames 2 which is less than the number of driving devices 5, wherein a number of driving devices 5 are not used during weaving.
- the driving devices 5 each comprise a crank 6, which is driven to rotate about an axis of rotation 17 (see Fig. 4 ), a coupling rod 7, and a first swivel lever 8.
- the first swivel lever 8 is swivelable to-and-fro about a swivel axis 9 between an upper position and a lower position.
- the swivel axis 9 is arranged stationary in a support 26.
- the driving device 5 shown in Fig. 1 further comprises a second swivel lever 10, that is swivelable to-and-fro about a second swivel axis 12 between an upper position and a lower position.
- the second swivel lever 10 is linked to the first swivel lever 8 by means of a connecting rod 11 and driven by the first swivel lever 8 to conjointly move with the first swivel lever 8.
- the heald frame 2 is linked to the first swivel lever 8 by means of a first lifting rod 13 and to the second swivel lever 10 by means of a second lifting rod 14.
- more than two swivel levers, associated connecting rods and associated lifting rods can be provided.
- Each driving device 5 comprises a drive motor 15, wherein the driving devices 5 are arranged in the shedding unit 1 such that the drive motors 15 are arranged at an outer side of the shedding unit 1 and the coupling rods 7 are arranged close to one another.
- the coupling rod 7 and the connecting rod 11 extend almost in line with each other, so that forces on the swivel axis 9 applied by the swivel lever 8 are minimized.
- other coupling rods and associated connecting rods can be used, for example coupling rods and connecting rods as shown in WO 2004/092465 A1 .
- Figs. 4 and 5 show a driving device 5 for a shedding unit 1 comprising a drive motor 15, a crank 6, a rotationally mounted drive element 16 (see Fig. 5 ), and a locking unit 30 (see Fig. 5 ).
- the drive element 16 is mounted via bearings in a support frame 4.
- the rotationally mounted drive element 16 has an axis of rotation 17, a first end 18, and a second end 19, wherein the first end 18 and the second end 19 are distanced from each other in the direction of the axis of rotation 17 of the drive element 16.
- the drive motor 15 is configured to drive the drive element 16 so as to move the drive element 16 about the axis of rotation 17 of the drive element 16.
- the drive motor 15 is arranged at the first end 18 of the drive element 16.
- the crank 6 is coupled at its proximal end 23 to the drive element 16 and at its distal end 24 to the coupling rod 7.
- the coupling rod 7 can rotate about an axis of rotation 28 of the crank 6.
- the drive element 16 is provided with a seat 20, which seat 20 in the embodiment shown is a member in the form of a truncated cone.
- the crank 6 is provided with a coupling element 21, which coupling element 21 in the embodiment shown is a receiving bushing, which is complementary in shape to the truncated cone of the seat 20.
- the coupling element 21 cooperates with the seat 20 for mounting or coupling the crank 6 to the drive element 16.
- the coupling element 21 and the seat 20 are arranged for locking the crank 6 to the drive element 16 by forcing the crank 6 and the drive element 16 towards each other in the direction of the seat axis 22, wherein the locking unit 30 is actuable for causing a movement of the crank 6 towards or away from the drive element 16 in the direction of the seat axis 22.
- the crank 6 and the drive element 16 are rotatable relative to each other about a seat axis 22 of the seat 20, which seat axis 22 is parallel but offset to the axis of rotation 17 of the drive element 16.
- the drive element 16 can be driven by the drive motor 15 to rotate together with the crank 6 about the axis of rotation 17 of the drive element 16 for causing an up and down movement of a heald frame 2 (see Fig. 1 ) coupled to the crank 6.
- one of the coupling element and the seat is a member in the form of a cylinder and the other one is a complementary receiving bushing, wherein for example the front end of the cylinder and the base of the receiving bushing can be forced towards each other for locking the drive element 16 to the crank 6.
- the locking unit 30 is configured to releasably lock the crank 6 to the drive element 16 in different angular positions with respect to the drive element 16.
- the locking unit 30 can also be referred as a fastening unit for releasably fastening the drive element 16 to the crank 6.
- the locking unit 30 comprises a locking pin 31, which is arranged in the drive element 16 concentric to the seat axis 22 of the seat 20 so as to be rotatable about the seat axis 22.
- the locking pin 31 has an actuating end 32 arranged at the first end 18 of the drive element 16, so that the actuating end 32 of the locking unit 30 is accessible for a manual operation from the first end 18 of the drive element 16 for locking the crank 6 to the drive element 16 or for unlocking the crank 6 from the drive element 16.
- the locking pin 31 is provided with a threaded end 33.
- the threaded end 33 cooperates with a threaded hole 34 of the crank 6 for causing a movement of the crank 6 towards or away from the drive element 16 in the direction of the seat axis 22 by rotating the locking pin 31 about the seat axis 22, thereby locking the crank 6 to the drive element 16 or unlocking the crank 6 from the drive element 16.
- a grease duct 29 is provided allowing to grease the bearing at the distal end 24, which grease duct 29 allows to guide grease that is supplied along the locking pin 31.
- Fig. 6 shows in a perspective view the driving device of Fig. 4 together with a tool 40 for actuating the actuating end 32 of the locking unit 30.
- the locking unit 30 comprises a locking pin 31 (see Fig. 5 ), which is moveably mounted to the drive element 16 and is moveable in one direction for locking the crank 6 to the drive element 16 and in an opposite direction for unlocking the crank 6 from the drive element 16.
- the locking pin 31 has an actuating end 32 configured to receive an actuating force by the tool 40 for moving the locking pin 31 with respect to the drive element 16, which actuating end 32 is arranged at the first end 18 of the drive element 16.
- the locking pin 31 is provided with the threaded end 33 (see Fig.
- the crank 6 is releasably lockable to the drive element 16, so that the crank 6 can be unlocked from the drive element 16 for a relative movement between the crank 6 and the drive element 16 in order to adjust the shed stroke, and so that the crank 6 can be locked to the drive element 16 in different angular positions with respect to the drive element 16 for a conjoint movement allowing an up and down movement of a heald frame 2 that is coupled to the driving device 5.
- the shed stroke of the driving device 5 i.e. a swivel movement of the first swivel lever 8 about the swivel axis 9 (see Fig. 1 ), and, thus, a stroke of the heald frame 2 can be set.
- Figs. 7 and 8 show in a schematic front view the proximal end 23 of the crank 6 coupled to the drive element 16 and the distal end 24 of the crank 6 coupled to the coupling rod 7.
- the coupling rod 7 is attached to the first swivel lever 8 via a hinged joint 25 allowing the coupling rod 7 to swivel about an axis of the hinged joint 25.
- a movement of the first swivel lever 8 about the swivel axis 9 is blocked by means of a blocking element 27 as schematically shown in Figs. 7 and 8 .
- the blocking element 27 can be provided near the second swivel lever 10, instead of near the first swivel lever 8 as shown in Figs. 7 and 8 .
- the blocking element 27 can be formed as a blocking element known from WO 2018/007168 A1 of the applicant.
- a blocking element can act on another element of the shedding unit 1, for example on the connecting rod 11, on the heald frame 2, or on still another element of the shedding unit 1.
- the driving device 5 is configured to move the drive element 16 about the axis of rotation 17 of the drive element 16 for causing a relative movement between the drive element 16 and the crank 6 about the seat axis 22.
- the coupling rod 7 is mounted to the crank 6 to rotate about an axis of rotation 28 of the crank 6.
- the distance between the axis of rotation 17 and the axis of rotation 28 is referred to as first eccentricity 35.
- the crank 6 is mounted to the drive element 16 so as to rotate about the seat axis 22 when the crank 6 is unlocked from the drive element 16.
- the distance between the axis of rotation 17 and the seat axis 22 is referred to as second eccentricity 36.
- the distance between the seat axis 22 and the axis of rotation 28 is referred to as the crank length of the crank 6.
- the first eccentricity 35 defines a circular trajectory 38 along which the axis of rotation 28 moves, in other words the circular trajectory 38 along which the distal end 24 of the coupling rod 7 is moved by the crank 6.
- the seat axis 22 moves along a circular trajectory 39 by rotating the drive element 16.
- the first eccentricity 35 depends on the second eccentricity 36, the third eccentricity 37, and the relative angular position between the drive element 16 and the crank 6.
- Fig. 7 shows in a schematic front view a first mutual positioning of the eccentricities 35, 36, 37, wherein the crank 6 or third eccentricity 37 is arranged in a first angular position with respect to the drive element 16 or the second eccentricity 36, while Fig. 8 shows the third eccentricity 37 arranged in a different second angular position with respect to the second eccentricity 36. As shown in Figs.
- the heald frame 2 (see Fig. 1 ) is moved to an upper position by the drive motor 15, a blocking element 27 is provided in the range of a first swivel lever 8, in particular under the first swivel lever 8, and the heald frame 2 is moved by the drive motor 15 until the first swivel lever 8 abuts against the blocking element 27.
- the locking pin 31 of the locking unit 30 (see Fig. 5 ) is rotated for unlocking the crank 6 from the drive element 16 by means of a tool 40 that cooperates with the actuating end 32 of the locking pin 31, so that the crank 6 is unlocked from the drive element 16, and so that the crank 6 is rotatable about the seat axis 22 of the seat 20 (see Fig. 5 ) of the drive element 16 by driving the drive element 16 by the drive motor 15.
- the drive element 16 is moved about the axis of rotation 17 of the drive element 16, and when the crank 6 is unlocked from the drive element 16, the angular position of the crank 6 with respect to the drive element 16 can be adjusted, for example between the positions of Fig. 7 and Fig. 8 .
- the heald frame 2 coupled to the crank 6 is held in position while driving the drive element 16 by the drive motor 15, so as to move the drive element 16 about the axis of rotation 17.
- the drive element 16 is moved by the drive motor 15 about the axis of rotation 17 of the drive element 16 in a direction associated with an upward movement of the heald frame 2 coupled to the crank 6.
- the crank 6 is locked again to the drive element 16, for example by rotating the locking pin 31 of the locking unit 30 by means of the tool 40 (see Fig. 6 ).
- the blocking element 27 is moved away from the swivel lever 8, in other words the blocking element 27 is displaced so that the blocking element 27 cannot make any contact with the first swivel lever 8 and does not hinder the movement of the first swivel lever 8.
- the crank 6 can be rotated together with the drive element 16 and the crank 6 can move the first swivel lever 8 with a set shed stroke causing a movement of the heald frame 2 over a set stroke.
- a computer program comprising instructions, which computer program, when the program is executed by a computer, causes the computer to carry out the adjustment method as explained above.
- the computer program comprising in one embodiment instructions which, when the program is executed by the computer, cause the computer to determine a direction of rotation of the drive element 16 associated with an upward movement of a heald frame 2 coupled to the crank 6, in other words a movement of the heald frame 2 for moving the first swivel lever 8 away from the blocking element 27. This prevents that the shedding unit 1 could be damaged by driving the drive motor 15, in case the locking unit 30 would be not unlocked well.
- the computer program in one embodiment comprises instructions which, when the program is executed by the computer, cause the computer to determine a reference angular position of the crank 6 with respect to the drive element 16 for setting a desired stroke of the heald frame 2 coupled to the crank 6. For example, a mutual angular position for a shed stroke defined by the circular trajectory 38 as shown in Fig. 7 or another mutual angular position for a shed stroke defined by the circular trajectory 38 as shown in Fig. 8 , which will cause a stroke of the heald frame 2, which further depends on a coupling position of the first lifting rod 13 (see Fig. 1 ) on the first swivel lever 8.
- a state of the driving device 5 is chosen, in which the swivel lever 8 makes contact with the blocking element 27.
- the movement of the distal end 24 of the crank 6 is constrained by the coupling rod 7 to a circular path having its center at the hinged joint 25.
- the orientation or the direction of the drive element 16 and, thus, the second eccentricity 36 as shown in Fig. 7 defines the reference angular position of a starting shed stroke shown in Fig. 7
- the orientation or the direction of the second eccentricity 36 as shown in Fig. 8 defines the reference angular position of a desired starting shed stroke shown in Fig. 8 .
- the person skilled in the art will understand that the reference angular positions and the shed strokes shown in Figs. 7 and 8 are given only as examples.
- the reference angular position can be stored, in other words a reference angular position is determined, in which the heald frame 2 coupled to the driving device 5 is in a defined position, namely the position in which the first swivel lever 8 can make contact with the blocking element 27.
- the first swivel lever 8 and the heald frame 2 coupled to the first swivel lever 8 are in a defined position determined by the blocking element 27.
- the blocking element 27 can make contact with the second swivel lever 10 as shown in Figs. 1 and 2
- the reference angular position will be determined by the position where the second swivel lever 10 can make contact with the blocking element 27.
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Abstract
Description
- The invention relates to a driving device for a shedding unit and a method for adjusting a shed stroke of a driving device for a shedding unit. The invention further relates to a computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method for adjusting a shed stroke of a driving device for a shedding unit.
- In the context of the application, a shedding unit is defined as a unit comprising one or more driving devices, which can be drivingly coupled to heald frames of a weaving machine for moving the heald frames up and down. For a movement of the heald frames, driving devices having a swivel lever with two or three arms are well known, wherein a rotating crank is coupled via a coupling rod to a first arm of the lever and the heald frame is coupled to a second arm of the lever. The heald frames are moved up and down with a stroke, which depends among others on the length of the crank, the length of the coupling rod, and the coupling positions of the coupling rod and the heald frame on the first arm and the second arm, respectively. In the context of the application, a shed stroke of a driving device for a shedding unit is defined as the stroke imparted by the driving device on the swivel lever or any similar connection element.
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WO 2017/032556 A1 shows a shedding unit, wherein the number of driving devices of the shedding unit is the same as the number of heald frames, and each driving device is configured for moving exactly one heald frame drivingly coupled to the driving device. The driving devices each comprise a rotating crank, a swivel lever, and a coupling rod connecting the swivel lever with the crank, wherein the coupling rod is mounted to a first arm of the swivel lever by means of a mounting element. The mounting element is slidably mounted to the first arm and fixable in an adjustable mounting position at the first arm for adjusting a shed stroke of the driving device. -
JPH09-112534 A - It is the object of the invention to provide a driving device, wherein a shed stroke can be easily adjusted. It is further the object of the invention, to provide a method for adjusting a shed stroke as well as a computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method for adjusting a shed stroke of a driving device for a shedding unit.
- According to a first aspect, a driving device for a shedding unit is provided, the driving device comprising a rotationally mounted drive element, a crank, and a locking unit, wherein the drive element has an axis of rotation, a first end, and a second end, wherein the first end and the second end are distanced from each other in the direction of the axis of rotation of the drive element, wherein the drive element is provided at the second end with a seat, wherein the crank is provided with a coupling element, which coupling element cooperates with the seat for mounting the crank to the drive element so as to be rotatable about a seat axis of the seat, which seat axis is parallel but offset to the axis of rotation of the drive element, wherein for a rotation about the axis of rotation of the drive element together with the drive element, the crank is releasably lockable to the drive element in different angular positions with respect to the drive element by the locking unit, and wherein when the crank is unlocked from the drive element, for adjusting the angular position of the crank with respect to the drive element, the driving device is configured to move the drive element about the axis of rotation of the drive element for causing a relative movement between the drive element and the crank about the seat axis.
- In the context of the application, a rotary movement of an element about an axis is referred to as movement about an axis, wherein the movement may be less or more than a full rotation about the axis.
- In one embodiment, the driving devices are used in a shedding unit, wherein the number of driving devices of the shedding unit is the same as the number of heald frames. In other words, each driving device is configured for moving exactly one heald frame drivingly coupled to the driving device. However, it is generally conceivable within the context of the application to couple more than one heald frame to a common driving device, wherein the driving device in one embodiment is configured to move two heald frames in opposite directions.
- The driving device according to the application allows for an easy adjustment of the shed stroke. In prior art document
JPH09-112534 A JPH09-112534 A - In one embodiment, a drive motor is provided, which drive motor is configured to drive the drive element so as to move about the axis of rotation of the drive element. The drive motor is driving the drive element to rotate about the axis of rotation together with the crank for an up and down movement of a heald frame coupled to the driving device. In addition, when the crank is unlocked from the drive element, the drive motor can be used for displacing or moving the drive element by a certain angle about the axis of rotation for an adjustment of the angular position of the crank with respect to the drive element.
- In one embodiment, the locking unit allows for an automated operation. For example, in one embodiment, the locking unit is in the form of a hydraulic expansion chuck, wherein a hydraulic pressure acting between the seat and the coupling element can be varied for locking the crank to the drive element or unlocking the crank from the drive element. In an alternative embodiment, the locking unit is in the form of a pneumatic and/or hydraulic actuable clutch. In still another embodiment, the locking unit comprises at least one pneumatic and/or hydraulic cylinder and a return spring, which cylinder is moveable for unlocking the locking unit by applying a pneumatic and/or hydraulic pressure.
- In alternative or in addition, the locking unit is manually operable, wherein in one embodiment the locking unit is accessible for a manual operation from a first end of the drive element for locking the crank to the drive element or for unlocking the crank from the drive element. For example, the shedding unit comprises a plurality of driving devices, which are arranged in two opposing groups, wherein the second ends of the drive elements of the two groups are facing towards a center of the shedding unit. In this case, the first ends are arranged at an outer side of the shedding unit and more easily accessible for an operator, than the second ends. This first end allows for an easy access for an operator for an adjustment of the shed stroke.
- In one embodiment, the coupling element and the seat are arranged for locking the crank to the drive element by forcing the crank and the drive element towards each other in the direction of the seat axis, wherein the locking unit is actuable for causing a movement of the crank towards or away from the drive element in the direction of the seat axis.
- In one embodiment, one of the coupling element and the seat is a member in the form of a truncated cone and the other one is a complementary receiving bushing. In other words, a conical seat connection is provided, which is backlash-free and self-centering. In addition, a locking and unlocking is possible by moving the coupling element a short distance with respect to the seat.
- In one embodiment, the locking unit comprises a locking pin, which locking pin is moveably mounted to the drive element and is moveable in one direction for locking the crank to the drive element and in an opposite direction for unlocking the crank from the drive element. In one embodiment, the locking pin is slidably supported. In alternative or in addition, the locking pin is rotatably supported. In preferred embodiments, the locking pin has an actuating end configured to receive an actuating force for moving the locking pin with respect to the drive element, which actuating end is arranged at the first end of the drive element. The actuating end in one embodiment is provided with a screw head for the application of a rotational movement and/or a torque.
- In one embodiment, the locking pin is mounted to the drive element so as to be longitudinally moveable along the seat axis, wherein the crank can be coupled to the locking pin for movement with the locking pin along the seat axis, for causing a movement of the crank towards or away from the drive element in the direction of the seat axis by axial movement of the locking pin. In one embodiment, the locking pin is forced in a locking position using a restoration element and is moveable against the force of a restoration element using for example a pneumatic and/or hydraulic cylinder.
- In other embodiments, the locking unit comprises a locking pin that is mounted to or arranged in the drive element so as to be rotatable about the seat axis, wherein the locking pin is provided with an actuating end configured to receive an actuating force for moving the locking pin with respect to the drive element, and wherein the locking pin is provided with a threaded end opposite to the actuating end, which threaded end cooperates with a threaded hole of the crank for causing a movement of the crank towards or away from the drive element in the direction of the seat axis by rotating the locking pin. In other words, the locking pin and the crank act as a spindle drive causing a movement of the crank in the direction of the seat axis by rotating the locking pin about the seat axis.
- The coupling element is provided at a proximal end of the crank, wherein a subsequent link such as a connecting rod is coupled to a distal end of the crank, for example using a hinged joint. In the context of the invention, a proximal end and a distal end of a crank are defined as the regions of the crank in which the crank can be coupled to a drive element and a subsequent link, such as a connecting rod, respectively. The length of the crank may be chosen such that a part of the crank extends beyond the proximal end and/or the distal end. In one embodiment, the distal end is not coupled to any element when adjusting a shed stroke, wherein the distal end is free to move. In preferred embodiments, a movement of a distal end of the crank is restricted to movement along a defined path upon adjusting the shed stroke. When unlocking the crank from the drive element, and restricting a movement of the distal end of the crank to a defined path while moving the drive element about the axis of rotation of the drive element, a movement of the drive element about the axis of rotation of the drive element causes a defined adjustment of the angular position of the crank with respect to the drive element.
- In embodiments, the driving device further comprising a link coupled with its first end to the distal end of the crank by a hinged joint, wherein when the crank is unlocked from the drive element, the drive element, the crank and the link together form a planar quadrilateral linkage. When adjusting the angular position of the crank with respect to the drive element, a second end of the link can be held fixed in position while moving the drive element about the axis of rotation of the drive element, and allowing the link to rotate about the second axis, thereby restricting the movement of the distal end of the crank about the seat axis.
- In embodiments, the driving device further comprising a swivel lever having a first arm and a second arm, wherein the swivel lever is swivelable to-and-fro about a swivel axis between a first position associated with an upper position of a heald frame coupled to the swivel lever and a lower position associated with a lower position of the heald frame coupled to the swivel lever, a coupling rod, which is linked to the crank by a first hinged joint, wherein the coupling rod is linked to the first arm of the swivel lever by a second hinged joint, wherein for adjusting the angular position of the crank with respect to the drive element, the second hinged joint, the swivel lever and/or the heald frame coupled to the driving device is/are held in position while moving the drive element about the axis of rotation of the drive element, thereby restricting the movement of the distal end of the crank to a defined path.
- According to a second aspect, a weaving machine with such a driving device is provided.
- According to a third aspect, a method for adjusting a shed stroke of a driving device for a shedding unit is provided, the driving device comprising a rotationally mounted drive element, a crank, and a locking unit, wherein the drive element has an axis of rotation, a first end, and a second end, wherein the first end and the second end are distanced from each other in the direction of the axis of rotation of the drive element, wherein the drive element is provided at the second end with a seat, wherein the crank is provided with a coupling element, which coupling element cooperates with the seat for mounting the crank to the drive element so as to be rotatable about a seat axis of the seat, which seat axis extends parallel but offset to the axis of rotation of the drive element, wherein for a rotation about the axis of rotation of the drive element together with the drive element the crank is releasably lockable to the drive element in different angular positions with respect to the drive element by the locking unit, wherein when the crank is unlocked from the drive element, for adjusting the angular position of the crank with respect to the drive element, the drive element is moved about the axis of rotation of the drive element for causing a relative movement between the drive element and the crank about the seat axis.
- In one embodiment, the drive element is driven to move about the axis of rotation of the drive element by a drive motor when the crank is unlocked from the drive element for adjusting the angular position of the crank with respect to the drive element.
- As mentioned above, in embodiments, a movement of the distal end of the crank is restricted while moving the drive element, for example due to a link coupled to the distal end of the crank, which together with the drive element and the crank forms a planar quadrilateral linkage when the crank is unlocked from the drive element.
- In one embodiment, a heald frame coupled to the crank is held in position while driving the drive element so as to move, in particular so as to rotate, about the axis of rotation of the drive element when the crank is unlocked from the drive element for restricting a movement of the distal end of the crank.
- In one embodiment, for adjusting the angular position of the crank with respect to the drive element, the drive element is moved about the axis of rotation of the drive element in a direction associated with an upward movement of the heald frame coupled to the crank. In this case, gravitational forces acting on the heald frame coupled to the driving device can be used for holding the heald frame in position while moving the drive element when the crank is unlocked from the drive element.
- According to a fourth aspect, a computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method for adjusting a shed stroke of a driving device comprising a drive element and a crank by moving the drive element about its axis of rotation when the crank is unlocked from the drive element.
- In one embodiment, the computer program further comprises instructions which, when the program is executed by the computer, cause the computer to determine a direction of rotation of the drive element associated with an upward movement of a heald frame coupled to the crank.
- In one embodiment, the computer program further comprises instructions which, when the program is executed by the computer, cause the computer to determine a reference angular position of the crank with respect to the drive element for setting a desired stroke of the heald frame coupled to the crank. In case the movement of the distal end of the crank is restricted when moving the drive element along a known path, the computer program may further comprise instructions which, when the program is executed by the computer, cause the computer to determine a necessary movement of the drive element about the axis of rotation for achieving a relative movement of the crank with respect to the drive element into said reference angular position.
- In the following, embodiments of the invention will be described in detail with reference to the drawings. Throughout the drawings, the same or similar elements will be denoted by the same reference numerals.
- Fig. 1
- shows in a perspective view a driving device for a shedding unit and a heald frame coupled to the driving device;
- Fig. 2
- shows in a front view the driving device and the heald frame of
Fig. 1 ; - Fig. 3
- shows in a perspective view a shedding unit comprising several driving devices;
- Fig. 4
- shows in a perspective view one driving device of the shedding unit of
Fig. 3 ; - Fig. 5
- shows a cross-sectional view of the driving device of
Fig. 4 ; - Fig. 6
- shows in a perspective view the driving device of
Fig. 4 together with a tool for actuating the locking unit; - Fig. 7
- shows a schematic front view of a drive element and a crank of a driving device, wherein the crank is arranged in a first angular position with respect to the drive element; and
- Fig. 8
- shows a schematic front view of a drive element and a crank of a driving device of
Fig. 7 , wherein the crank is arranged in a second angular position with respect to the drive element, which second angular position is different from the first angular position. -
Figs. 1 and2 show ashedding unit 1 and aheald frame 2 of a weaving machine. Although only oneheald frame 2 is visible, the weaving machine comprises a number of heald frames 2, which are guided in a frame guide (not shown) of the weaving machine and driven to move up and down. - As shown in the perspective view of
Fig. 3 , the sheddingunit 1 comprisesseveral driving devices 5, wherein the number ofdriving devices 5 in the embodiment shown is the same as the number of heald frames 2. In other words, onedriving device 5 is assigned to oneheald frame 2, whichheald frame 2 is coupled to the associated onedriving device 5. In the embodiment shown inFig. 3 , the sheddingunit 1 comprises eightdriving devices 5 according to the invention. In an alternative embodiment, a different number of driving devices may be provided, for example a number of sixteen driving devices as shown inWO 2017/032556 A1 . In an embodiment, ashedding unit 1 having a number ofdriving devices 5 can also be used for driving a number of heald frames 2 which is less than the number ofdriving devices 5, wherein a number ofdriving devices 5 are not used during weaving. - The
driving devices 5 each comprise acrank 6, which is driven to rotate about an axis of rotation 17 (seeFig. 4 ), acoupling rod 7, and afirst swivel lever 8. Thefirst swivel lever 8 is swivelable to-and-fro about aswivel axis 9 between an upper position and a lower position. Theswivel axis 9 is arranged stationary in asupport 26. The drivingdevice 5 shown inFig. 1 further comprises asecond swivel lever 10, that is swivelable to-and-fro about asecond swivel axis 12 between an upper position and a lower position. Thesecond swivel lever 10 is linked to thefirst swivel lever 8 by means of a connectingrod 11 and driven by thefirst swivel lever 8 to conjointly move with thefirst swivel lever 8. In the embodiment ofFig. 1 , for example, theheald frame 2 is linked to thefirst swivel lever 8 by means of afirst lifting rod 13 and to thesecond swivel lever 10 by means of asecond lifting rod 14. In an alternative embodiment, preferably in case of wide heald frames, more than two swivel levers, associated connecting rods and associated lifting rods can be provided. - As generally known, for moving the heald frames 2 up and down, the
crank 6 is driven to rotate about an axis ofrotation 17, thereby causing a to-and-fro movement of thefirst swivel lever 8 about theswivel axis 9. Each drivingdevice 5 comprises adrive motor 15, wherein thedriving devices 5 are arranged in theshedding unit 1 such that thedrive motors 15 are arranged at an outer side of theshedding unit 1 and thecoupling rods 7 are arranged close to one another. In a preferred embodiment, thecoupling rod 7 and the connectingrod 11 extend almost in line with each other, so that forces on theswivel axis 9 applied by theswivel lever 8 are minimized. In alternative embodiments, other coupling rods and associated connecting rods can be used, for example coupling rods and connecting rods as shown inWO 2004/092465 A1 . -
Figs. 4 and5 show adriving device 5 for ashedding unit 1 comprising adrive motor 15, acrank 6, a rotationally mounted drive element 16 (seeFig. 5 ), and a locking unit 30 (seeFig. 5 ). Thedrive element 16 is mounted via bearings in asupport frame 4. The rotationally mounteddrive element 16 has an axis ofrotation 17, afirst end 18, and asecond end 19, wherein thefirst end 18 and thesecond end 19 are distanced from each other in the direction of the axis ofrotation 17 of thedrive element 16. Thedrive motor 15 is configured to drive thedrive element 16 so as to move thedrive element 16 about the axis ofrotation 17 of thedrive element 16. Thedrive motor 15 is arranged at thefirst end 18 of thedrive element 16. - The
crank 6 is coupled at itsproximal end 23 to thedrive element 16 and at itsdistal end 24 to thecoupling rod 7. Thecoupling rod 7 can rotate about an axis ofrotation 28 of thecrank 6. At thesecond end 19 of thedrive element 16, thedrive element 16 is provided with aseat 20, whichseat 20 in the embodiment shown is a member in the form of a truncated cone. Thecrank 6 is provided with acoupling element 21, whichcoupling element 21 in the embodiment shown is a receiving bushing, which is complementary in shape to the truncated cone of theseat 20. Thecoupling element 21 cooperates with theseat 20 for mounting or coupling thecrank 6 to thedrive element 16. Thecoupling element 21 and theseat 20 are arranged for locking thecrank 6 to thedrive element 16 by forcing thecrank 6 and thedrive element 16 towards each other in the direction of theseat axis 22, wherein the lockingunit 30 is actuable for causing a movement of thecrank 6 towards or away from thedrive element 16 in the direction of theseat axis 22. Thus, when thecrank 6 is unlocked from thedrive element 16, thecrank 6 and thedrive element 16 are rotatable relative to each other about aseat axis 22 of theseat 20, whichseat axis 22 is parallel but offset to the axis ofrotation 17 of thedrive element 16. When thecrank 6 is locked to thedrive element 16, thedrive element 16 can be driven by thedrive motor 15 to rotate together with thecrank 6 about the axis ofrotation 17 of thedrive element 16 for causing an up and down movement of a heald frame 2 (seeFig. 1 ) coupled to thecrank 6. - In an alternative embodiment, one of the coupling element and the seat is a member in the form of a cylinder and the other one is a complementary receiving bushing, wherein for example the front end of the cylinder and the base of the receiving bushing can be forced towards each other for locking the
drive element 16 to thecrank 6. - The locking
unit 30 is configured to releasably lock the crank 6 to thedrive element 16 in different angular positions with respect to thedrive element 16. The lockingunit 30 can also be referred as a fastening unit for releasably fastening thedrive element 16 to thecrank 6. In the embodiment shown inFig. 4 and5 , the lockingunit 30 comprises a lockingpin 31, which is arranged in thedrive element 16 concentric to theseat axis 22 of theseat 20 so as to be rotatable about theseat axis 22. The lockingpin 31 has an actuatingend 32 arranged at thefirst end 18 of thedrive element 16, so that the actuatingend 32 of the lockingunit 30 is accessible for a manual operation from thefirst end 18 of thedrive element 16 for locking thecrank 6 to thedrive element 16 or for unlocking thecrank 6 from thedrive element 16. Opposite to the actuatingend 32 of the lockingpin 31, the lockingpin 31 is provided with a threadedend 33. The threadedend 33 cooperates with a threadedhole 34 of thecrank 6 for causing a movement of thecrank 6 towards or away from thedrive element 16 in the direction of theseat axis 22 by rotating the lockingpin 31 about theseat axis 22, thereby locking thecrank 6 to thedrive element 16 or unlocking thecrank 6 from thedrive element 16. Further, agrease duct 29 is provided allowing to grease the bearing at thedistal end 24, which greaseduct 29 allows to guide grease that is supplied along the lockingpin 31. -
Fig. 6 shows in a perspective view the driving device ofFig. 4 together with atool 40 for actuating the actuatingend 32 of the lockingunit 30. As described above, the lockingunit 30 comprises a locking pin 31 (seeFig. 5 ), which is moveably mounted to thedrive element 16 and is moveable in one direction for locking thecrank 6 to thedrive element 16 and in an opposite direction for unlocking thecrank 6 from thedrive element 16. The lockingpin 31 has an actuatingend 32 configured to receive an actuating force by thetool 40 for moving the lockingpin 31 with respect to thedrive element 16, which actuatingend 32 is arranged at thefirst end 18 of thedrive element 16. As described above, the lockingpin 31 is provided with the threaded end 33 (seeFig. 5 ) cooperating with the threadedhole 34 of thecrank 6, thus allowing to apply a torque by thetool 40 on the actuatingend 32 of the lockingpin 31 to move or rotate the lockingpin 31, and to thereby move the crank 6 towards or away from thedrive element 16 in the direction of theseat axis 22. - The
crank 6 is releasably lockable to thedrive element 16, so that the crank 6 can be unlocked from thedrive element 16 for a relative movement between thecrank 6 and thedrive element 16 in order to adjust the shed stroke, and so that the crank 6 can be locked to thedrive element 16 in different angular positions with respect to thedrive element 16 for a conjoint movement allowing an up and down movement of aheald frame 2 that is coupled to thedriving device 5. By an adjustment of the angular position between thedrive element 16 and thecrank 6, the shed stroke of thedriving device 5, i.e. a swivel movement of thefirst swivel lever 8 about the swivel axis 9 (seeFig. 1 ), and, thus, a stroke of theheald frame 2 can be set. -
Figs. 7 and8 show in a schematic front view theproximal end 23 of thecrank 6 coupled to thedrive element 16 and thedistal end 24 of thecrank 6 coupled to thecoupling rod 7. Thecoupling rod 7 is attached to thefirst swivel lever 8 via a hinged joint 25 allowing thecoupling rod 7 to swivel about an axis of the hinged joint 25. Further, preferably for adjusting the angular position of thecrank 6 with respect to thedrive element 16, in the embodiment shown inFig. 7 , a movement of thefirst swivel lever 8 about theswivel axis 9 is blocked by means of a blockingelement 27 as schematically shown inFigs. 7 and8 . Hence, when thecrank 6 is unlocked from thedrive element 16 for a relative movement between thecrank 6 and thedrive element 16, thedrive element 16, thecrank 6 and thecoupling rod 7 form a planar quadrilateral linkage. Therefore, when thedrive element 16 is moved about the axis ofrotation 17 of thedrive element 16, a movement of thecrank 6 with respect to thedrive element 16 about theseat axis 22 of theseat 20 is constrained by thecoupling rod 7, because the movement of thecoupling rod 7 is constrained by thefirst swivel lever 8. This allows to impart a defined relative movement between thedrive element 16 and thecrank 6 when thecrank 6 is unlocked from thedrive element 16. In an alternative embodiment, as shown inFigs. 1 and2 , the blockingelement 27 can be provided near thesecond swivel lever 10, instead of near thefirst swivel lever 8 as shown inFigs. 7 and8 . In an alternative embodiment, the blockingelement 27 can be formed as a blocking element known fromWO 2018/007168 A1 of the applicant. In an alternative embodiment, a blocking element can act on another element of theshedding unit 1, for example on the connectingrod 11, on theheald frame 2, or on still another element of theshedding unit 1. - As will be explained more in detail with reference to
Figs. 7 and8 , for adjusting the angular position of thecrank 6 with respect to thedrive element 16, the drivingdevice 5 is configured to move thedrive element 16 about the axis ofrotation 17 of thedrive element 16 for causing a relative movement between thedrive element 16 and thecrank 6 about theseat axis 22. - When the
crank 6 is mounted to thedrive element 16, thedrive element 16 and thecrank 6 rotate together about the axis ofrotation 17. Thecoupling rod 7 is mounted to the crank 6 to rotate about an axis ofrotation 28 of thecrank 6. The distance between the axis ofrotation 17 and the axis ofrotation 28 is referred to asfirst eccentricity 35. Thecrank 6 is mounted to thedrive element 16 so as to rotate about theseat axis 22 when thecrank 6 is unlocked from thedrive element 16. The distance between the axis ofrotation 17 and theseat axis 22 is referred to assecond eccentricity 36. The distance between theseat axis 22 and the axis ofrotation 28 is referred to as thethird eccentricity 37, also named the crank length of thecrank 6. When thecrank 6 is mounted to thedrive element 16, thefirst eccentricity 35 defines acircular trajectory 38 along which the axis ofrotation 28 moves, in other words thecircular trajectory 38 along which thedistal end 24 of thecoupling rod 7 is moved by thecrank 6. Theseat axis 22 moves along acircular trajectory 39 by rotating thedrive element 16. - The
first eccentricity 35 depends on thesecond eccentricity 36, thethird eccentricity 37, and the relative angular position between thedrive element 16 and thecrank 6.Fig. 7 shows in a schematic front view a first mutual positioning of theeccentricities crank 6 orthird eccentricity 37 is arranged in a first angular position with respect to thedrive element 16 or thesecond eccentricity 36, whileFig. 8 shows thethird eccentricity 37 arranged in a different second angular position with respect to thesecond eccentricity 36. As shown inFigs. 7 and8 , by adjusting the angular position of thethird eccentricity 37 with respect to thesecond eccentricity 36, in other words by adjusting the angular position of thecrank 6 with respect to thedrive element 16 by rotating thecrank 6 about theseat axis 22, thefirst eccentricity 35 of thedriving device 5 is adjusted, and, thus, a shed stroke of thedriving device 5 can be adjusted. - For adjusting the angular position of the
crank 6 with respect to thedrive element 16, in particular for adjusting this angular position from a mutual positioning as shown inFig. 7 to a mutual positioning as shown inFig. 8 , and, thus, in order to adjust the shed stroke, preferably the heald frame 2 (seeFig. 1 ) is moved to an upper position by thedrive motor 15, a blockingelement 27 is provided in the range of afirst swivel lever 8, in particular under thefirst swivel lever 8, and theheald frame 2 is moved by thedrive motor 15 until thefirst swivel lever 8 abuts against the blockingelement 27. - Then, the locking
pin 31 of the locking unit 30 (seeFig. 5 ) is rotated for unlocking thecrank 6 from thedrive element 16 by means of atool 40 that cooperates with the actuatingend 32 of the lockingpin 31, so that thecrank 6 is unlocked from thedrive element 16, and so that thecrank 6 is rotatable about theseat axis 22 of the seat 20 (seeFig. 5 ) of thedrive element 16 by driving thedrive element 16 by thedrive motor 15. By driving thedrive motor 15, thedrive element 16 is moved about the axis ofrotation 17 of thedrive element 16, and when thecrank 6 is unlocked from thedrive element 16, the angular position of thecrank 6 with respect to thedrive element 16 can be adjusted, for example between the positions ofFig. 7 andFig. 8 . Due to the blockingelement 27, theheald frame 2 coupled to the crank 6 is held in position while driving thedrive element 16 by thedrive motor 15, so as to move thedrive element 16 about the axis ofrotation 17. When thecrank 6 is unlocked from thedrive element 16, a movement of thedistal end 24 of thecrank 6 is restricted. Preferably, for adjusting the angular position of thecrank 6 with respect to thedrive element 16, thedrive element 16 is moved by thedrive motor 15 about the axis ofrotation 17 of thedrive element 16 in a direction associated with an upward movement of theheald frame 2 coupled to thecrank 6. - After adjusting is completed, for example when the position of
Fig. 8 is reached, thecrank 6 is locked again to thedrive element 16, for example by rotating the lockingpin 31 of the lockingunit 30 by means of the tool 40 (seeFig. 6 ). In the meanwhile, the blockingelement 27 is moved away from theswivel lever 8, in other words the blockingelement 27 is displaced so that the blockingelement 27 cannot make any contact with thefirst swivel lever 8 and does not hinder the movement of thefirst swivel lever 8. Now, by means of thedrive motor 15, the crank 6 can be rotated together with thedrive element 16 and the crank 6 can move thefirst swivel lever 8 with a set shed stroke causing a movement of theheald frame 2 over a set stroke. - In order to drive the
drive motor 15 for setting or adjusting the shed stroke, a computer program comprising instructions is used, which computer program, when the program is executed by a computer, causes the computer to carry out the adjustment method as explained above. The computer program comprising in one embodiment instructions which, when the program is executed by the computer, cause the computer to determine a direction of rotation of thedrive element 16 associated with an upward movement of aheald frame 2 coupled to the crank 6, in other words a movement of theheald frame 2 for moving thefirst swivel lever 8 away from the blockingelement 27. This prevents that theshedding unit 1 could be damaged by driving thedrive motor 15, in case the lockingunit 30 would be not unlocked well. - Further the computer program in one embodiment comprises instructions which, when the program is executed by the computer, cause the computer to determine a reference angular position of the
crank 6 with respect to thedrive element 16 for setting a desired stroke of theheald frame 2 coupled to thecrank 6. For example, a mutual angular position for a shed stroke defined by thecircular trajectory 38 as shown inFig. 7 or another mutual angular position for a shed stroke defined by thecircular trajectory 38 as shown inFig. 8 , which will cause a stroke of theheald frame 2, which further depends on a coupling position of the first lifting rod 13 (seeFig. 1 ) on thefirst swivel lever 8. For moving thecrank 6 with respect to driveelement 16 into the determined reference angular position, in one embodiment a state of thedriving device 5 is chosen, in which theswivel lever 8 makes contact with the blockingelement 27. In this way, the movement of thedistal end 24 of thecrank 6 is constrained by thecoupling rod 7 to a circular path having its center at the hinged joint 25. Hence, the orientation or the direction of thedrive element 16 and, thus, thesecond eccentricity 36 as shown inFig. 7 , defines the reference angular position of a starting shed stroke shown inFig. 7 , and the orientation or the direction of thesecond eccentricity 36 as shown inFig. 8 defines the reference angular position of a desired starting shed stroke shown inFig. 8 . The person skilled in the art will understand that the reference angular positions and the shed strokes shown inFigs. 7 and8 are given only as examples. - For the control of the
drive motor 15, the reference angular position can be stored, in other words a reference angular position is determined, in which theheald frame 2 coupled to thedriving device 5 is in a defined position, namely the position in which thefirst swivel lever 8 can make contact with the blockingelement 27. Thus, if thedrive element 16 of thedriving device 5 is in this defined position, thefirst swivel lever 8 and theheald frame 2 coupled to thefirst swivel lever 8 are in a defined position determined by the blockingelement 27. In an alternative embodiment, if the blockingelement 27 can make contact with thesecond swivel lever 10, as shown inFigs. 1 and2 , the reference angular position will be determined by the position where thesecond swivel lever 10 can make contact with the blockingelement 27. -
- 1. A driving device for a shedding unit (1), the driving device (5) comprising a rotationally mounted drive element (16), a crank (6), and a locking unit (30), wherein the drive element (16) has an axis of rotation (17), a first end (18), and a second end (19), wherein the first end (18) and the second end (19) are distanced from each other in the direction of the axis of rotation (17) of the drive element (16), wherein the drive element (16) is provided at the second end (19) with a seat (20), wherein the crank (6) is provided with a coupling element (21), which coupling element (21) cooperates with the seat (20) for mounting the crank (6) to the drive element (16) so as to be rotatable about a seat axis (22) of the seat (20), which seat axis (22) is parallel but offset to the axis of rotation (17) of the drive element (16), wherein for a rotation about the axis of rotation (17) of the drive element (16) together with the drive element (16), the crank(6) is releasably lockable to the drive element (16) in different angular positions with respect to the drive element (16) by the locking unit (30), wherein when the crank (6) is unlocked from the drive element (16), for adjusting the angular position of the crank (6) with respect to the drive element (16), the driving device (5) is configured to move the drive element (16) about the axis of rotation (17) of the drive element (16) for causing a relative movement between the drive element (16) and the crank (6) about the seat axis (22).
- 2. The driving device according to
embodiment 1, wherein a drive motor (15) is provided, which drive motor (15) is configured to drive the drive element (16) so as to move about the axis of rotation (17) of the drive element (16). - 3. The driving device embodiment to
embodiment - 4. The driving device according to any one of
embodiments - 5. The driving device according to any one of
embodiment 1 to 4, wherein one of the coupling element (21) and the seat (20) is a member in the form of a truncated cone and the other one is a complementary receiving bushing. - 6. The driving device according to any one of
embodiment 1 to 5, wherein the locking unit (30) comprises a locking pin (31), which locking pin (31) is moveably mounted to the drive element (16) and is moveable in one direction for locking the crank (6) to the drive element (16) and in an opposite direction for unlocking the crank (6) from the drive element (16), wherein in particular the locking pin (31) has an actuating end (32) configured to receive an actuating force for moving the locking pin (31) with respect to the drive element (16), which actuating end (32) is arranged at the first end (18) of the drive element (16). - 7. The driving device according to
embodiment 6, characterized in that the locking pin (31) is arranged in the drive element (16) so as to be rotatable about the seat axis (22), wherein the locking pin (31) is provided with an actuating end (32) configured to receive an actuating force for moving the locking pin (31) with respect to the drive element (16), and wherein the locking pin (31) is provided with a threaded end (33) opposite to the actuating end (32), which threaded end (33) cooperates with a threaded hole (34) of the crank (6) for causing a movement of the crank (6) towards or away from the drive element (16) in the direction of the seat axis (22) by rotating the locking pin (31) about the seat axis (22). - 8. A weaving machine with a driving device according to any one of
embodiments 1 to 7. - 9. A method for adjusting a shed stroke of a driving device (5) for a shedding unit (1), the driving device (5) comprising a rotationally mounted drive element (16), a crank (6), and a locking unit (30), wherein the drive element (16) has an axis of rotation (17), a first end (18), and a second end (19), wherein the first end (18) and the second end (19) are distanced from each other in the direction of the axis of rotation (17) of the drive element (16), wherein the drive element (16) is provided at the second end (19) with a seat (20), wherein the crank (6) is provided with a coupling element (21), which coupling element (21) cooperates with the seat (20) for mounting the crank (6) to the drive element (16) so as to be rotatable about a seat axis (22) of the seat (20), which seat axis (22) extends parallel but offset to the axis of rotation (17) of the drive element (16), and wherein for a rotation about the axis of rotation (17) of the drive element (16) together with the drive element (16), the crank (6) is releasably lockable to the drive element (16) in different angular positions with respect to the drive element (16) by the locking unit (30), wherein when the crank (6) is unlocked from the drive element (16), for adjusting the angular position of the crank (6) with respect to the drive element (16), the drive element (16) is moved about the axis of rotation (17) of the drive element (16) for causing a relative movement between the drive element (16) and the crank (6) about the seat axis (22).
- 10. The method according to
embodiment 9, characterized in that the drive element (16) is driven to move about the axis of rotation (17) of the drive element (16) by a drive motor (15) when the crank (6) is unlocked from the drive element (16) for adjusting the angular position of the crank (6) with respect to the drive element (16). - 11. The method according to
embodiment - 12. The method according to
embodiment 11, wherein for adjusting the angular position of the crank (6) with respect to the drive element (16), the drive element (16) is moved about the axis of rotation (17) of the drive element (16) in a direction associated with an upward movement of the heald frame (2) coupled to the crank (6). - 13. A computer program comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of
embodiments 9 to 12. - 14. The computer program according to
embodiment 13, further comprising instructions which, when the program is executed by the computer, cause the computer to determine a direction of rotation of the drive element (16) associated with an upward movement of a heald frame (2) coupled to the crank (6). - 15. The computer program according to
embodiment
Claims (15)
- A driving device for a shedding unit (1), the driving device (5) comprising a rotationally mounted drive element (16), a crank (6), and a locking unit (30), wherein the drive element (16) has an axis of rotation (17), a first end (18), and a second end (19), wherein the first end (18) and the second end (19) are distanced from each other in the direction of the axis of rotation (17) of the drive element (16), wherein the drive element (16) is provided at the second end (19) with a seat (20), wherein the crank (6) is provided with a coupling element (21), which coupling element (21) cooperates with the seat (20) for mounting the crank (6) to the drive element (16) so as to be rotatable about a seat axis (22) of the seat (20), which seat axis (22) is parallel but offset to the axis of rotation (17) of the drive element (16), wherein for a rotation about the axis of rotation (17) of the drive element (16) together with the drive element (16), the crank (6) is releasably lockable to the drive element (16) in different angular positions with respect to the drive element (16) by the locking unit (30), characterized in that when the crank (6) is unlocked from the drive element (16), for adjusting the angular position of the crank (6) with respect to the drive element (16), the driving device (5) is configured to move the drive element (16) about the axis of rotation (17) of the drive element (16) for causing a relative movement between the drive element (16) and the crank (6) about the seat axis (22), wherein means are provided for restricting a movement of a distal end (24) of the crank (6) to movement along a defined path, when unlocking the crank (6) from the drive element (16) and moving the drive element (16) about the axis of rotation (17) of the drive element (16).
- The driving device according to claim 1, characterized in that the driving device (5) further comprising a first swivel lever (8) having a first arm and a second arm, wherein the first swivel lever (8) is swivelable to-and-fro about a swivel axis (9) between a first position associated with an upper position of a heald frame (2) coupled to the first swivel lever (8) and a lower position associated with a lower position of the heald frame (2) coupled to the first swivel lever (8), a coupling rod (7), which is linked to the crank (6) by a first hinged joint, wherein the coupling rod (7) is linked to the first arm of the first swivel lever (8) by a second hinged joint (25), and a blocking element (27), wherein for adjusting the angular position of the crank (6) with respect to the drive element (16), the second hinged joint (25), the first swivel lever (8) and/or the heald frame (2) coupled to the driving device (5) is/are held in position by means of the blocking element (27) while moving the drive element (16) about the axis of rotation (17) of the drive element, thereby restricting the movement of the distal end (24) of the crank (6) to the defined path.
- The driving device according to claim 1, characterized in that the driving device (5) further comprising a coupling rod (7) coupled to the distal end (24) of the crank (6), a first swivel lever (8), which first swivel lever (8) is linked to the coupling rod (7) and swivelable to-and-fro about a swivel axis (9) between an upper position and a lower position, a connecting rod (11), and a second swivel lever (10), which second swivel lever (10) is swivelable to-and-fro about a swivel axis (12) between an upper position and a lower position, and is linked to the first swivel lever (8) by means of a connecting rod (11), wherein the means for restricting the movement of the distal end (24) of the crank (6) when unlocking the crank (6) from the drive element (16) is a blocking element (27), which blocking element (27) can be arranged in the range of one of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and a heald frame (2) coupled to the driving device (5) to hinder a movement of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and the heald frame (2), and can be displaced so that it does not hinder the movement of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and the heald frame (2).
- The driving device according to claim 2 or 3, characterized in that the blocking element (27) is configured to be placed under the first swivel lever (8), when the heald frame (2) coupled to the first swivel lever (8) is in an upper position, and the heald frame (2) is adapted to be moved downwards until the first swivel lever (8) abuts against the blocking element (27).
- The driving device according to any one of claims 1 to 4, characterized in that a drive motor (15) is provided, which drive motor (15) is configured to drive the drive element (16) so as to move about the axis of rotation (17) of the drive element (16).
- A weaving machine with a driving device according to any one of claims 1 to 5.
- A method for adjusting a shed stroke of a driving device (5) for a shedding unit (1), the driving device (5) comprising a rotationally mounted drive element (16), a crank (6), and a locking unit (30), wherein the drive element (16) has an axis of rotation (17), a first end (18), and a second end (19), wherein the first end (18) and the second end (19) are distanced from each other in the direction of the axis of rotation (17) of the drive element (16), wherein the drive element (16) is provided at the second end (19) with a seat (20), wherein the crank (6) is provided with a coupling element (21), which coupling element (21) cooperates with the seat (20) for mounting the crank (6) to the drive element (16) so as to be rotatable about a seat axis (22) of the seat (20), which seat axis (22) extends parallel but offset to the axis of rotation (17) of the drive element (16), and wherein for a rotation about the axis of rotation (17) of the drive element (16) together with the drive element (16), the crank (6) is releasably lockable to the drive element (16) in different angular positions with respect to the drive element (16) by the locking unit (30), characterized in that when the crank (6) is unlocked from the drive element (16), for adjusting the angular position of the crank (6) with respect to the drive element (16), the drive element (16) is moved about the axis of rotation (17) of the drive element (16) for causing a relative movement between the drive element (16) and the crank (6) about the seat axis (22), wherein a movement of a distal end (24) of the crank (6) is restricted to a movement along a defined path, when unlocking the crank (6) from the drive element (16) and moving the drive element (16) about the axis of rotation (17) of the drive element (16).
- The method according to claim 7, characterized in that the driving device (5) further comprising a first swivel lever (8) having a first arm and a second arm, wherein the first swivel lever (8) is swivelable to-and-fro about a swivel axis (9) between a first position associated with an upper position of a heald frame (2) coupled to the first swivel lever (8) and a lower position associated with a lower position of the heald frame (2) coupled to the first swivel lever (8), a coupling rod (7), which is linked to the crank (6) by a first hinged joint, wherein the coupling rod (7) is linked to the first arm of the first swivel lever (8) by a second hinged joint (25), and a blocking element (27), wherein for adjusting the angular position of the crank (6) with respect to the drive element (16), the second hinged joint (25), the first swivel lever (8) and/or the heald frame (2) coupled to the driving device (5) is/are held in position by means of the blocking element (27) while moving the drive element (16) about the axis of rotation (17) of the drive element, thereby restricting the movement of the distal end (24) of the crank (6) to a defined path.
- The method according to claim 7, characterized in that the driving device (5) further comprising a coupling rod (7) coupled to the distal end (24) of the crank (6), a first swivel lever (8), which first swivel lever (8) is linked to the coupling rod (7) and swivelable to-and-fro about a swivel axis (9) between an upper position and a lower position, a connecting rod (11), and a second swivel lever (10), which second swivel lever (10) is swivelable to-and-fro about a swivel axis (12) between an upper position and a lower position, and is linked to the first swivel lever (8) by means of a connecting rod (11), wherein the means for restricting the movement of the distal end (24) of the crank (6) when unlocking the crank (6) from the drive element (16) is a blocking element (27), which blocking element (27) can be arranged in the range of one of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and a heald frame (2) coupled to the driving device (5) to hinder a movement of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and the heald frame (2), and can be displaced so that it does not hinder the movement of the first swivel lever (8), the connecting rod (11), the second swivel lever (10), and the heald frame (2).
- The method according to claim 8 or 9, characterized in that the heald frame (2) coupled to the first swivel lever (8) is moved to an upper position, the blocking element (27) is placed under the first swivel lever (8), and the heald frame (2) is moved downwards until the first swivel lever (8) abuts against the blocking element (27).
- The method according to any one of claims 7 to 10, characterized in that the drive element (16) is driven to move about the axis of rotation (17) of the drive element (16) by a drive motor (15) when the crank (6) is unlocked from the drive element (16) for adjusting the angular position of the crank (6) with respect to the drive element (16).
- The method according to any one of claims 7 to 11, characterized in that for adjusting the angular position of the crank (6) with respect to the drive element (16), the drive element (16) is moved about the axis of rotation (17) of the drive element (16) in a direction associated with an upward movement of a heald frame (2) coupled to the crank (6).
- A computer program for use with the driving device (5) according to claim 5, the computer program comprising instructions which, when the program is executed by a computer, cause the computer to drive the drive motor (15) for adjusting a shed stroke of the driving device (5) when the crank (6) is unlocked from the drive element (16), wherein the drive element (16) is driven to move about the axis of rotation (17) of the drive element (16) by the drive motor (15) for causing a relative movement between the drive element (16) and the crank (6) about the seat axis (22).
- The computer program according to claim 13, further comprising instructions which, when the program is executed by the computer, cause the computer to determine a stored reference angular position of the crank (6) with respect to the drive element (16) for setting a desired stroke of the heald frame (2) coupled to the crank (6).
- The computer program according to claim 14, further comprising instructions which, when the program is executed by the computer, cause the computer to determine a necessary movement of the drive element (16) about the axis of rotation (17) for achieving a relative movement of the crank (6) with respect to the drive element (16) into said stored reference angular position, when the movement of the distal end (24) of the crank (6) is restricted to the movement along the defined path when moving the drive element (16).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP23196030.3A EP4269675A3 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19213195.1A EP3831991B1 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
EP23196030.3A EP4269675A3 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19213195.1A Division EP3831991B1 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
Publications (2)
Publication Number | Publication Date |
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EP4269675A2 true EP4269675A2 (en) | 2023-11-01 |
EP4269675A3 EP4269675A3 (en) | 2023-12-27 |
Family
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP19213195.1A Active EP3831991B1 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
EP23196030.3A Pending EP4269675A3 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP19213195.1A Active EP3831991B1 (en) | 2019-12-03 | 2019-12-03 | Driving device for a shedding unit and method for adjusting a shed stroke |
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EP (2) | EP3831991B1 (en) |
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FR3126714B1 (en) | 2021-09-06 | 2023-09-08 | Staubli Sa Ets | Shed forming machine for a loom and its adjustment method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09112534A (en) | 1995-10-13 | 1997-05-02 | Tsudakoma Corp | Driving quantity changing mechanism of crank device |
WO2004092465A1 (en) | 2003-04-17 | 2004-10-28 | Picanol N.V. | Drive for heald frames of a loom |
WO2017032556A1 (en) | 2015-08-26 | 2017-03-02 | Picanol | Drive mechanism for driving a heald frame of a weaving machine |
WO2018007168A1 (en) | 2016-07-08 | 2018-01-11 | Picanol | Blocking device and shedding unit for a weaving machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3984562B2 (en) * | 2003-05-16 | 2007-10-03 | 津田駒工業株式会社 | Loom opening device |
-
2019
- 2019-12-03 EP EP19213195.1A patent/EP3831991B1/en active Active
- 2019-12-03 EP EP23196030.3A patent/EP4269675A3/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09112534A (en) | 1995-10-13 | 1997-05-02 | Tsudakoma Corp | Driving quantity changing mechanism of crank device |
WO2004092465A1 (en) | 2003-04-17 | 2004-10-28 | Picanol N.V. | Drive for heald frames of a loom |
WO2017032556A1 (en) | 2015-08-26 | 2017-03-02 | Picanol | Drive mechanism for driving a heald frame of a weaving machine |
WO2018007168A1 (en) | 2016-07-08 | 2018-01-11 | Picanol | Blocking device and shedding unit for a weaving machine |
Also Published As
Publication number | Publication date |
---|---|
EP4269675A3 (en) | 2023-12-27 |
EP3831991C0 (en) | 2023-09-13 |
EP3831991A1 (en) | 2021-06-09 |
EP3831991B1 (en) | 2023-09-13 |
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