Control device for linear knitting machines thread-guide bars

Information

  • Patent Application
  • 20070209402
  • Publication Number
    20070209402
  • Date Filed
    March 05, 2007
    17 years ago
  • Date Published
    September 13, 2007
    17 years ago
Abstract
A control device (1) for thread-guide bars (2) of linear knitting machines, comprising a linear motor (10) designed to impart a translational motion to the thread-guide bar (2), means (40) for moving the thread-guide bar (2) according to an oscillating motion basically perpendicular to the translational motion, and transmission means (20) for transmitting to the thread-guide bar (2) the translational motion of the linear motor (10), thus enabling the oscillating motion. The device (1) is characterized in that the transmission means (20) include a first transmission element (21) associated to and integral with the linear motor (10), and a second transmission element (24) that can be integrally connectable to the thread-guide bar (2). Moreover, the first transmission element (21) has a first guide (22) having preferably a basically curved shape, in which the second transmission element (24) is movably engaged.
Description

Further characteristics and advantages of the invention will be more apparent from the description of a preferred but not exclusive embodiment of the device, as shown to a merely indicative purpose in the following drawings:



FIGS. 1A, 1B, 1C, 1D, 2, 3A and 3B show examples of known control devices for thread-guide bars of linear knitting machines;



FIG. 4 shows a perspective view of a control device for thread-guide bars of linear knitting machines according to the invention, in which the device is associated to a first end portion of a thread-guide bar;



FIG. 5 shows a side view of the device of FIG. 4;



FIG. 6 shows a front view of the device of FIG. 4, in which the motors are in accordance with a first execution variant;



FIG. 7A shows a section of the device of FIG. 6 according to line VII-VII;



FIG. 7B shows the same device as in FIG. 7A associated to a second end portion of the thread-guide bar;



FIG. 8 shows a section of the device of FIG. 7A according to line VIII-VIII;



FIG. 9A shows a support of a linear knitting machine according to the invention associated to a first end portion of the thread-guide bars, in which the motors are in accordance with a second execution variant;



FIG. 9B shows a support of the linear knitting machine of FIG. 9A associated to a second end portion of the thread-guide bars;



FIG. 10 shows an axonometric front view of a linear motor of the device of FIG. 4 in its first execution variant;



FIG. 11 shows an axonometric front view of an interface plate associated to the linear motor of FIG. 10;



FIG. 12 shows an axonometric front view of a linear motor of the device of FIG. 4 in its second execution variant.


Claims
  • 1. A control device (1) for thread-guide bars (2) of warp linear knitting machines, comprising: a linear motor (10) designed to impart a translational motion to said thread-guide bar (2),means (40) for moving said thread-guide bar (2) according to an oscillating motion basically perpendicular to said translational motion, andtransmission means (20) for transmitting to said thread-guide bar (2) said translational motion (10) of said linear motor (10), thus enabling said oscillating motion;characterized in thatsaid transmission means (20) include a first transmission element (21) associated to and integral with said linear motor (10), and a second transmission element (24) that can be associated integrally to said thread-guide bar (2), said first transmission element (21) having a first guide (22) in which said second transmission element (24) is movably engaged.
  • 2. The device (1) according to claim 1, characterized in that said first guide (22) has a basically curved shape so as to enable said oscillating motion of said thread-guide bar (2).
  • 3. The device (1) according to claim 1, characterized in that said first transmission element (21) has an inner recess (23) having at least a basically curved shape and defining said first guide (22), said second transmission element (24) having a first end portion (25) matching said recess (23) so as to oscillate inside said recess (23), in order to transmit said translational motion to said thread-guide bar (2) and to enable said oscillating motion.
  • 4. The device (1) according to claim 3, characterized in that said recess (23) is defined by two discrete portions (21a) of said first transmission element (21) designed to enclose said first end portion (25) of said second transmission element (24).
  • 5. The device (1) according to claim 1, characterized in that said second transmission element (24) has a second end portion (26), said second end portion (26) being integrally associated to said thread-guide bar (2).
  • 6. The device (1) according to claim 3, characterized in that said transmission means (20) further include a plurality of spheres (28) located inside said recess (23) between said first (21) and said second transmission element (24), and a plurality of fastening elements (29) designed to increase pressure between said first (21) and said second transmission element (24) and said spheres (28) in said recess (23) so as to minimize clearances between said first (21) and said second transmission element (24).
  • 7. The device (1) according to claim 1, characterized in that said transmission means (20) further include an interface plate (30) associated to said linear motor (10), said first transmission element (21) being fastened to said interface plate (30).
  • 8. The device (1) according to claim 1, characterized in that said second transmission element (24) has a middle axis (27) that is always parallel to a direction of said translational motion.
  • 9. The device (1) according to claim 1, characterized in that said linear motor (10) has at least one fixed part (11) and a movable part (12) designed to transmit to said thread-guide bar (2) said translational motion, said interface plate (30) or said first transmission element (21) being fastened to an end portion (12a) of said movable part (12).
  • 10. The device (1) according to claim 9, characterized in that said fixed part (11) includes coils designed to generate an electromagnetic field when an electric current goes through them, and in that said movable part (12) includes magnets that are sensitive to said electromagnetic field, said movable part (12) being moved so as to generate said translational motion as a result of said electromagnetic field acting upon said magnets.
  • 11. The device (1) according to claim 9, characterized in that said movable part (12) of said linear motor (10) is basically T-shaped so as to minimize the space occupied by said motor (10), and it is placed between at least two of said fixed parts (11).
  • 12. The device (1) according to claim 11, characterized in that said movable part (12) of said linear motor (10) is basically shaped as a double T.
  • 13. The device (1) according to claim 9, characterized in that said movable part (12) of said linear motor (10) is basically I-shaped so as to minimize the space occupied by said motor (10), and it is placed between at least two of said fixed parts (11).
  • 14. The device (1) according to claim 9, characterized in that said motor (10) comprises at least one second sliding guide (13) for said movable part (12) of said motor (10).
  • 15. The device (1) according to claim 14, characterized in that said motor (10) includes at least two of said second sliding guides (13) placed between said fixed part (11) and said movable part (12) so as to simplify the translational sliding of said movable part (12) with respect to said fixed part (11) and to minimize the distance between said movable part (12) and said fixed part (11) and the overall size of said motor (10).
  • 16. The device according to claim 9, characterized in that it further includes detection means acting upon said motor (10) so as to drive and control the movement of said movable part (12) with respect to said fixed part (11).
  • 17. The device according to claim 1, characterized in that, said means (40) for moving said thread-guide bar (2) according to said oscillating motion are associated to and cooperate with said transmission means (20).
  • 18. The device (1) according to claim 17, characterized in that said means (40) for moving include a support (41) designed to move according to said oscillating motion around an axis (42) of rotation, slidingly associated to said second transmission element (24) on at least one engagement portion (43).
  • 19. The device (1) according to claim 18, characterized in that said support (41) is further provided with a second engagement portion (44) that is slidingly associated to said second transmission element (24) for transmitting stiffly said oscillating motion and enabling said translational motion.
  • 20. The device (1) according to claim 19, characterized in that said support (41) is engaged to said second transmission element (24) on said first (43) and said second engagement portion (44) by means of sliding sleeves (45).
  • 21. A linear knitting machine characterized in that it comprises at least one control device (1) for thread-guide bars (2) according to claim 1.
  • 22. The machine according to claim 21, characterized in that it comprises a plurality of said control devices (1) for thread-guide bars (2).
  • 23. The machine according to claim 22, characterized in that said motors (10) of said plurality of devices (1) are arranged radially so as to describe basically an arc in a plane basically parallel to an oscillation plane of said thread-guide bars (2) so as to enable the maximum closeness between each of said motors (10) and the corresponding thread-guide bar (2).
  • 24. The machine according to claim 22, characterized in that a first group of said devices (1) is associated to one of the two end portions (2a) of said thread-guide bars (2), whereas a second group of said devices (1) is associated to another one of said two end portions (2a) of said thread-guide bars (2) so as to optimize the distance between each of said motors (10) and the corresponding thread-guide bar (2).
  • 25. The machine according to claim 22, characterized in that said means (40) for moving comprise two of said supports (41), one of said supports (41) being associated to each of said transmission elements (24) of said devices (1), and another one of said supports (41) being associated on an opposite end portion (2a) of said thread-guide bar (2).
Priority Claims (1)
Number Date Country Kind
BS2006A000056 Mar 2006 IT national