EP0771893A1 - Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine - Google Patents
Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine Download PDFInfo
- Publication number
- EP0771893A1 EP0771893A1 EP95830465A EP95830465A EP0771893A1 EP 0771893 A1 EP0771893 A1 EP 0771893A1 EP 95830465 A EP95830465 A EP 95830465A EP 95830465 A EP95830465 A EP 95830465A EP 0771893 A1 EP0771893 A1 EP 0771893A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- detaching
- distributor
- hydraulic
- distributor valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G19/00—Combing machines
- D01G19/06—Details
- D01G19/26—Driving arrangements
Definitions
- the present invention relates to apparatus for providing reciprocating rotary drive to the detaching rollers of a combing machine, of the type comprising at least one detaching roller with a fixed axis and hydraulic drive means actuated by pressurised fluid through at least one distributor valve and kinematically connected to the at least one detaching roller to rotate it in both senses about the said axis.
- the combing operation is carried out by a combing machine having a circular comb which rotates continuously, a straight comb, a movable gripper unit which substantially reciprocates, and detaching rollers.
- the detaching rollers In each combing cycle of the machine, the detaching rollers must first rotate backwards through a predetermined angle to enable a predetermined length of the fibres which have already been combed to be superposed on those still to be combed and must then rotate forwards through a greater angle to advance the fibres to be combed.
- the rotary drive for the detaching rollers is derived from the main transmission of the combing machine.
- a further problem of these transmissions lies in the difficulty of driving the detaching rollers so that their movements accord with the desired law of motion and of varying the drive appropriately in a simple manner so as to optimise the law governing the movements of the detaching rollers according to the type of fibre to be combed.
- US Patent 3277790 discloses combing machines in which the reciprocating rotary drive for the detaching rollers is provided by an hydraulic motor supplied with pressurised fluid through a mechanically-controlled distributor valve.
- the present invention is based on the technical problem of devising apparatus for providing reciprocating rotary drive to the detaching rollers of a combing machine which has structural and functional characteristics such as to overcome the problems mentioned with reference to prior-art combing machines.
- apparatus for providing reciprocating rotary drive to the detaching rollers of a combing machine of the type specified which is characterised in that the at least one distributor valve is electrically controlled and in that it includes a first sensor which generates a signal correlated with the progress of the combing machine operating cycle, a second sensor which generates a signal correlated with the angular position of the at least one detaching roller and an electronic control and command unit connected to the first and second sensors for controlling the operation of the distributor valve in dependence on the signals generated by the first and second sensors.
- apparatus for providing reciprocating rotary drive to the detaching rollers of a combing machine is generally indicated 1.
- the combing machine includes a continuously-rotating circular comb, a straight comb and a movable gripper unit which substantially reciprocates, which, being of known type, are not shown in the drawings and are not described in detail below in order not to burden the present description.
- the combing machine includes two parallel detaching rollers 3 with axes A-A, located adjacent each other at a predetermined spacing D, each of which has an associated pressure roller 4 located parallel to and above it, in pressing contact therewith.
- the combing machine can thus be seen to include two pairs 2 of parallel rollers each of which is constituted by a detaching roller 3 and a respective pressure roller 4 the peripheral surfaces of which are in pressing contact so that they are coupled together for rotation.
- the detaching rollers 3 and the pressure rollers 4 are rotatably supported at their ends by a frame 5 of the combing machine ( Figure 2).
- the detaching rollers 3 of each pair 2 are kinematically connected together by a toothed transmission so that they are coupled together for rotation in the same sense.
- the transmission is achieved by the keying of a gear 6 to each end of the detaching rollers 3 and the connection of the gears 6 of one detaching roller 3 to the corresponding gears 6 of the other detaching roller 3 by respective identical idle gears 7 and 8 supported for rotation by the frame 5 of the combing machine.
- the apparatus 1 includes an hydraulic motor 9 of known type, the rotary drive shaft 10 of which is connected for rotation to the hub of the idle gear 7.
- the hydraulic motor 9 is driven through an hydraulic distributor 11 by pressurised fluid from an hydraulic circuit 12 including a fluid reservoir 13, a motor pump unit 14 mounted on a duct P which puts the reservoir 13 in fluid communication with an inlet I of the hydraulic distributor 11 and a duct T connecting an outlet O of the hydraulic distributor 11 to the reservoir 13.
- the hydraulic circuit 12 further includes elements such as filters, pressure switches, surge chambers, non-return valves etc. which, being of known type, are not shown in the drawings and are not described in detail below in order not to burden the present description but which however are included as far as necessary for the proper operation of the equipment.
- the hydraulic distributor 11 is of the proportional type with an electromagnetically controlled distributor slide 15 biased into a central closed position ( Figure 3) by a centring spring. Besides the inlet I and the outlet O the hydraulic distributor 11 also have two connections A and B in fluid communication with the hydraulic motor 9. The movement of the distributor slide 15 enables the inlet I and the outlet O of the hydraulic distributor 11 to be put into fluid communication with the connections A and B respectively or vice versa.
- the operation of the hydraulic distributor 11 is controlled by an electronic control unit 31 including an electronic amplifier 16 and an electronic data-processing unit 19.
- the electronic amplifier 16 is connected through an electrical conductor L1 to electromagnets 17 which drive the movements of the distributor slide 15.
- the electronic amplifier 16 is connected through a conductor S1 to a position detector 18, for example of the LVDT (linear variable differential transformer) type, associated with the distributor slide 15 and which can supply the electronic amplifier 16 with a signal related to the position of the distributor slide 15.
- a position detector 18 for example of the LVDT (linear variable differential transformer) type
- the electronic data-processing unit 19 is interfaced with the electronic amplifier 16 and is connected through an electrical conductor S2 to a sensor 20, for example an encoder, associated with the idle gear 8.
- the sensor 20 supplies the electronic data-processing unit 9 with a signal related to the angular position of the idle gear 8 and hence of the detaching rollers 3.
- the electronic data-processing unit 19 is connected by an electrical conductor S3 to a sensor 32 which is associated with the circular comb and supplies the electronic data-processing unit 19 with an electrical signal related to the angular position of the circular comb. Since the operating cycle of the combing machine is repeated on each complete rotation of the circular comb, this electrical signal is thus correlated with the progress of the machine operating cycle.
- the electronic data-processing unit 19 includes a microprocessor 21 (CPU) which is interfaced with a video-keyboard unit 22, with RAM and EPROM memories 23, with an analog/digital signal converter 24 and with a data input/output card 25 respectively.
- CPU microprocessor
- the data input/output card 25 is connected through the conductors S2 and S3 to the sensor 20 associated with the idle gear 8 and with the sensor 32 associated with a circular comb respectively, while it supplies the electronic amplifier 16 with an enabling signal through a conductor S4.
- the hydraulic distributor 11 may be replaced by an electrically-controlled, hydraulically-driven servovalve 26 for example of known two-stage type with nozzles 27 and a flapper plate 28 ( Figure 5).
- the first stage of the servovalve 26 comprises a torque motor 29 which is connected to the electronic amplifier 16 through the conductor L1 and drives the movement of the flapper plate 28 between the nozzles 27.
- the second stage comprises a distributor slide 30 which enables an inlet I and an outlet O to be connected to respective connections A and B connected to the hydraulic motor 9 and vice versa.
- the fluid of the hydraulic circuit 12 acts on opposite end faces of the distributor slide 30 with an equal pressure only when the flapper plate 28 is equidistant from the nozzles 27. Consequently, when the torque motor 29 moves the flapper plate 28 towards one of the nozzles 27, the pressure difference which is set up between the ends of the distributor slide 30 causes the slide itself to move.
- the servovalve 2 has an advantage over the hydraulic distributor 11 in that it moves the distributor slide 30 by means of the power supplied by the hydraulic circuit 12 on which the regulation is effected since the torque motor 29, through the conductor L1, takes only the power needed to position the flapper plate 28 between the nozzles 27.
- the fibres to be combed pass through the gripper unit, are combed by the circular comb and by the straight comb and pass between the detaching roller 3 and pressure roller 4 of each pair 2, from which the fibres are drawn.
- the detaching rollers 3 At each rotation of the circular comb, the detaching rollers 3, as already stated in the introduction to the present description, rotate in the sense opposing the advance of the fibres and then rotate in the opposite sense through a greater angle.
- the reciprocating rotation of the detaching rollers 3 through different angles is effected by the connection of the connections A and B of the hydraulic distributor 11 alternately in fluid communication with the ducts P and T of the hydraulic circuit 12 by suitable movement of the distributor slide 15 so as to rotate the hydraulic motor 9 since a predetermined rotation of the drive shaft 10 of the hydraulic motor 9 corresponds to a rotation of the detaching rollers 3 through an angle which depends on the transmission ratio between the idle gears 7 and 8 and the gears 6.
- the movement of the distributor slide 15 is controlled by the electronic data-processing unit 19 which supplies the electronic amplifier 16 with an electrical control signal which depends on the signals received from the sensor 20 associated with the idle gear 8 and the sensor 32 associated with the circular comb.
- the control signal after being processed appropriately by the electronic amplifier 16 in dependence on the signal supplied by the position detector 18 to the electronic amplifier 16, is fed to the electromagnets 17 of the hydraulic distributor 11 or, in the case of the servovalve 26, to the torque motor 29, so as to drive the required movement of the distributor slide 15.
- the apparatus according to the present invention enables the movements of the distributor slide to be governed accurately and appropriately by the electronic control and command unit 31, which enables the flow of pressurised fluid to the hydraulic motor 9 to be regulated precisely so as to rotate the detaching rollers 3 through different angles in opposite senses as required for the correct operation of the combing machine.
- respective devices according to the present invention for providing reciprocating rotary drive to the detaching rollers of a combing machine are generally indicated 601 and 701, these parts which are structurally and functionally equivalent to corresponding parts of the apparatus 1 being indicated by the same reference numerals and not being described below so as not to burden the present description to no purpose.
- the hydraulic drive means are constituted by two double acting hydraulic actuators 602 each having a piston head 603 defining two variable-volume chambers 604 and 605 within the actuator cylinder and a rod 606 fixed to the piston head 603.
- each piston 603 is kinematically connected to a detaching roller 3 by a known rack and pinion transmission and a unidirectional clutch device which enables the reciprocating rectilinear movement of the piston 603 to be converted into discontinuous rotary drive for the detaching roller 3.
- this transmission comprises, for each of the two hydraulic actuators 602, a rack 607 fixed for translational movement with the piston 603 and a pinion 608 meshed with the teeth of the rack 607 and keyed to a detaching roller 3 through a unidirectional clutch device 609, also known as a free wheel, which can transmit drive torque to the detaching roller 3 in only one rotational sense.
- one of the two unidirectional clutch devices 609 transmits torque and rotational drive to the detaching roller 3 in the opposite sense from those transmitted by the other unidirectional clutch device 609, as will become clearer in the description below.
- the apparatus 601 includes an hydraulic distributor 610 similar to the distributor 11 described above, having its inlet I and its outlet O respectively in fluid communication with the ducts P and T of the hydraulic circuit 12 and the connections A and B respectively in fluid communication with the variable-volume chambers 604 and 605 of the hydraulic actuator 602.
- the racks 607 are arranged, relative to the pistons 603 to which they are connected so that they supply pressurised fluid to one of the two variable-volume chambers 604 while simultaneously connecting the other to exhaust, or vice versa, so as to move the piston 603 of each hydraulic actuator 602 to rotate the pinions 608 in the same sense.
- the apparatus 601 further includes a manually-operable hydraulic distributor 611 having an inlet I connected to the pressurised fluid duct P, an outlet O connected to the duct T of the hydraulic circuit 12 and two connections A and B connected respectively in fluid communication with the connections A and B of the two hydraulic distributors 610.
- the hydraulic distributor 611 enables the pistons 603 of the two hydraulic actuators 602 to be put in phase with each other.
- the two hydraulic distributors 610 are controlled by the electronic amplifier 16 independently of each other in dependence on the electrical signal transmitted to the latter by the electronic data processing unit 19.
- the length of travel of the piston 603 of one of the two hydraulic actuators 602 determines the amplitude of the rotation of the detaching rollers 3 in one sense while the amplitude of the rotation of the detaching rollers 3 in the other sense is determined by the travel of the piston 603 of the other of the two hydraulic actuators 602.
- the hydraulic drive means are constituted by a double-acting hydraulic actuator 702 which includes a piston 703 defining two variable-volume chambers 704 in the hydraulic actuator 702 and a rod 705 connected to the piston 703.
- the rod 705 is fixed for translational movement with a rack 706 meshed with a pinion 707 kinematically connected to the hub of the idle gear 7 through a braked clutch unit 708 of known type.
- the braked clutch unit 708 comprises a friction disc fixed to an input shaft 709 to which the pinion 707 is keyed, a braked clutch disc fixed to an output shaft 710 to which the idle gear 7 is keyed, actuators, for example of electro-pneumatic type, for moving the clutch disc into engagement with the friction disc and friction means for braking the clutch disc when it is disengaged from the friction disc.
- An electronic control system 711 is connected to the braked clutch unit 708 by a conductor L3 and is connected to the electronic control and command unit 31 and, more precisely, to the electronic data processing unit 19, by an electrical conductor L4. Depending on the signal received from the electronic data processing unit 19, the electronic control system 711 causes the braked clutch disc to engage with the friction disc so as to connect the output shaft 710 rigidly for rotation with the input shaft 709.
- the apparatus 701 includes an hydraulic distributor 712 which is the same as the distributor 11 described previously having an input I and an outlet O respectively in fluid communication with the ducts P and T of the hydraulic circuit 12 and the connections A and B respectively in fluid communication with the variable-volume chambers 704 of the hydraulic actuator 702.
- the hydraulic distributor 712 is controlled by the electronic amplifier 16 in dependence on the electrical signal transmitted to the latter by the electronic data processing unit 19.
- the reciprocating rotation of the detaching rollers is achieved by the alternate supply of pressurised fluid from the hydraulic circuit 12 into one of the two variable volume chambers 704 of the hydraulic actuator 702 and the simultaneous connection of the other variable-volume chamber 704 to exhaust.
- the electronic control system 711 By controlling the engagement and disengagement of the braked clutch disc and the friction disc through the electronic control system 711, it is thus possible to rotate the detaching rollers 3 in the two senses through different angles.
- the law of motion which governs the rotation of the detaching rollers 3 can be varied by varying the parameters set in the memory of the electronic data processing unit 19.
- the apparatus for providing reciprocating rotary drive to the detaching rollers of a combing machine of the present invention enables the requirements referred to in the introduction to the present description to be satisfied while overcoming the problems of prior-art combing machines at the same time.
- a further advantage of the apparatus according to the present invention lies in the fact that it enables the law of motion which governs the rotation of the detaching rollers to be varied in a simple manner so as to optimise the operation of the machine to suit the type of fibres being combed.
- Another advantage of the apparatus according to the present invention lies in the fact that it is structurally and functionally simple so as to improve the reliability of the combing machine compared with that of prior-art machines.
- the combing machine may include a larger number of detaching rollers and the sensor associated with the circular comb may be replaced by a sensor associated with part of the combing machine which moves cyclically during each working cycle of the machine.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995614806 DE69514806T2 (de) | 1995-11-02 | 1995-11-02 | Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine |
EP19950830465 EP0771893B1 (de) | 1995-11-02 | 1995-11-02 | Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19950830465 EP0771893B1 (de) | 1995-11-02 | 1995-11-02 | Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0771893A1 true EP0771893A1 (de) | 1997-05-07 |
EP0771893B1 EP0771893B1 (de) | 2000-01-26 |
Family
ID=8222048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950830465 Expired - Lifetime EP0771893B1 (de) | 1995-11-02 | 1995-11-02 | Vorrichtung für einen Hin- und Herdrehantrieb von Abreisszylindern einer Kämmaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0771893B1 (de) |
DE (1) | DE69514806T2 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1726692A1 (de) * | 2005-05-26 | 2006-11-29 | Marzoli S.p.A. | Abreisswalze für Kämmaschinen |
CN100451191C (zh) * | 2004-12-24 | 2009-01-14 | 经纬纺织机械股份有限公司 | 精梳机的分离罗拉的传动装置 |
CN110067046A (zh) * | 2018-01-23 | 2019-07-30 | 里特机械公司 | 用于精梳机的分离辊的驱动设备 |
CN113795617A (zh) * | 2019-05-09 | 2021-12-14 | 里特机械公司 | 具有用于精梳机的分离滚筒对的压力滚筒的装置的分离滚筒单元 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277790A (en) * | 1963-07-05 | 1966-10-11 | Sperry Gyroscope Co Ltd | Hydraulic apparatus |
DE3104704A1 (de) * | 1981-02-10 | 1982-08-26 | Per Henrik Gösta 59030 Borensberg Nyström | "servovorrichtung" |
RO91688A2 (ro) * | 1985-09-26 | 1987-08-31 | Centrul De Cercetare Stiintifica Si Inginerie Tehnologica De Masini Si Utilaje Pentru Industria Usoara,Ro | Mecanism de antrenare a masinii verticale de pieptanat fuior de in sicinepa |
EP0374723A2 (de) * | 1988-12-23 | 1990-06-27 | Maschinenfabrik Rieter Ag | Kämmaschine |
DE4415055C1 (de) * | 1993-05-11 | 1995-05-18 | Rexroth Mannesmann Gmbh | Steuerung für einen hydraulischen Antrieb (Kraft- bzw. Drucksteuerung) |
-
1995
- 1995-11-02 EP EP19950830465 patent/EP0771893B1/de not_active Expired - Lifetime
- 1995-11-02 DE DE1995614806 patent/DE69514806T2/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277790A (en) * | 1963-07-05 | 1966-10-11 | Sperry Gyroscope Co Ltd | Hydraulic apparatus |
DE3104704A1 (de) * | 1981-02-10 | 1982-08-26 | Per Henrik Gösta 59030 Borensberg Nyström | "servovorrichtung" |
RO91688A2 (ro) * | 1985-09-26 | 1987-08-31 | Centrul De Cercetare Stiintifica Si Inginerie Tehnologica De Masini Si Utilaje Pentru Industria Usoara,Ro | Mecanism de antrenare a masinii verticale de pieptanat fuior de in sicinepa |
EP0374723A2 (de) * | 1988-12-23 | 1990-06-27 | Maschinenfabrik Rieter Ag | Kämmaschine |
DE4415055C1 (de) * | 1993-05-11 | 1995-05-18 | Rexroth Mannesmann Gmbh | Steuerung für einen hydraulischen Antrieb (Kraft- bzw. Drucksteuerung) |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Week 8801, Derwent World Patents Index; AN 88-004988, XP002000917 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100451191C (zh) * | 2004-12-24 | 2009-01-14 | 经纬纺织机械股份有限公司 | 精梳机的分离罗拉的传动装置 |
EP1726692A1 (de) * | 2005-05-26 | 2006-11-29 | Marzoli S.p.A. | Abreisswalze für Kämmaschinen |
CN110067046A (zh) * | 2018-01-23 | 2019-07-30 | 里特机械公司 | 用于精梳机的分离辊的驱动设备 |
CN110067046B (zh) * | 2018-01-23 | 2023-05-23 | 里特机械公司 | 用于精梳机的分离辊的驱动设备 |
CN113795617A (zh) * | 2019-05-09 | 2021-12-14 | 里特机械公司 | 具有用于精梳机的分离滚筒对的压力滚筒的装置的分离滚筒单元 |
Also Published As
Publication number | Publication date |
---|---|
EP0771893B1 (de) | 2000-01-26 |
DE69514806D1 (de) | 2000-03-02 |
DE69514806T2 (de) | 2000-08-03 |
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