Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
  • D05B3/06—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for sewing buttonholes

Definitions

• a device for driving of lateral needle bar movement especially of sewing machines for button holes, comprising a shaft for driving the lateral movement mechanism provided with driving cam of lateral movement and coupled with driving shaft of vertical movement of needle bar.
• the sewing machjnes -used for stitching the button holes comprise a mechanism for lateral needle bar movement which enables to secure the fabric in vicinity of a button hole by means of zig-zag stitch before cutting through or after cutting through the button hole.
• the device performs the transfer of needle bar above the sewn material at a moment when the needle bar with needle is lifted above the fabric.
• lateral movement is achieved by alternating shifting of the needle bar itself, while sometimes to this movement also the alternating side movement of the table with the sewn material is being added.
• the required size of lateral movement is adjustable within structural scope of possibilities of mechanism coupled with needle bar and/or with the table.
• the drive of mechanism of needle bar lateral movement is realised by means of a lateral movement shaft driven by a special motor, or preferably it is derived from the main driving crank-shaft, by means of which the vertical reversible movement of needle bar is caused.
• the axis of lateral movement shaft is arranged perpendicularly to the crank-shaft.
• the lateral movement shaft quite often comprises means to balance the inertial forces induced at reverse movement of lateral movement mechanism.
• One of the known 1 embodiments solves the coupling of the main driving shaft and to it in a skew, manner perpendicular counter-shaft which drives the lateral movement mechanism by means of gear assembly formed of cylindric worm wheels.
• gear assemblies first of all feature high surface pressures and high relative sliding speeds in the place of teeth engagement. The result is a great wear and from it resulting inaccuracy of adjusted values for lateral movement and inaccurate synchronising of vertical and lateral movement motion of the needle bar.
• the goal of the technical solution is to eliminate shortcomings of the background art, especially to reduce its production and operational costs, at the same time to preserve the advantageous compact arrangement of two skew running shafts for vertical movement of the needle and with it coupled movement in direction of the lateral movement. .
• a device for driving the lateral needle bar movement whose principle consists in that, it comprises the counter shaft connected by means of a tooth gear assembly to the driving ; " ' / ' ;” , 3
• the counter shaft connected with the driving shaft of needle bar vertical movement by means of. bevel gear assembly in combination with gearing of toothed belt enables an easy/skew arrangement of the driving shaft of needle bar vertical movement and pf the driving shaft of lateral movement mechanism.
• this bevel gear is a bevel gear with straight teeth, which is price affordable and features satisfactory functional properties.
• toothed belt there is assigned a means for its stretching.
• Optimally tightened toothed belt exerts a positive impact on accuracy of dependence at turning of input and output shaft of gearing and on service life of the belt.
• FIG. 1 shows a longitudinal view to the device and the Fig. 2 a ground plan of the device.
• the drive of the needle -bar ⁇ in vertical direction is in a known manner initiated by the driving crankshaft ⁇ driven by the not represented electromotor.
• the crank of the shaft and its coupling to the needle bar is not represented.
• the driving shaft is rotatable mounted in the frame 10 of sewing machine.
• the lateral movement motion of the needle bar 1 is initiated by a known lateral movement mechanism, which comprises the shaft 2 for drive of the lateral movement mechanism arranged in a skew manner with respect to the driving shaft H of vertical movement of the needle bar I-.
• the shaft 2 for drive of the lateral movement mechanism is rotatable mounted in the frame 10 of sewing machine. In a ground plan view the shafts 2 and IJ are mutually perpendicular.
• the shaft 2 for drive of lateral movement mechanism there is further in a fixed manner also connected the toothed pulley 22, and in exemplary embodiment also the wheel 23 of manual steering.
• the lateral movement mechanism further comprises a two-armed transmission lever 3 mounted by means of a pivot pin 3J- in the frame 10 of sewing machine.
• the pivot pin 3J- in vertical plane with respect to the frame 10 of the sewing machine is in a known manner controllably displaceable , for example by means of the not represented gate.
• the transmission lever 3 on one of its ends is
• the second end of the transmission lever 3 is in a joint manner connected with the in detail not represented known leverage 4 serving to initiate motion of the lower guiding bearing 12 of the needle bar I-.
• a not represented known device for turning of needle is arranged on outer surface of the lower guiding bearing ⁇ 2 of the needle bar 1 .
• the upper end'of the needle bar 1 in a known manner is mounted in the frame 10 of the machine by means of the spherical bearing 13.
• the driving shaft IJ of vertical movement of the needle bar 1 by means of the tooth bevel gear is connected with the counter shaft 5 mounted rotatable in the frame ⁇ Q_ of the sewing machine.
• the bevel gear has a straight teeth, in other exemplary embodiments has a inclined teeth, r U possibly cyclopaloidal.
• the shafts H and 5 are mutually positioned in a skew manner and are perpendicular.
• On the driving shaft H of vertical movement of the needle bar 1. in a fixed manner is mounted the pinion 14, which is in engagement with the tooth wheel 51 mounted in a fixed manner on the counter shaft 5.
• On the counter shaft there is further in a fixed manner mounted the tooth pulley 52.
• tooth pulley 22 On the shaft 2 of drive of lateral movement mechanism the tooth pulley 22 is attached, which is with toothed belt 6 connected with tooth pulley 52 of the counter shaft 5.
• the tension pulley 61 abuts on the outer surface of the toothed belt 6. . .
• the driving cam 2 at rotation is acting upon the inner side surfaces of the sensing fork 32 of the transmission lever 3.
• the transmission lever swings around the pivot pin 3_1 which moves in a controlled manner in the gate, at the same time its second end moves by means of the leverage 4 the lower guiding bearing 12 of the needle! bar!.
• This movement is performed in a plane being perpendicular to running of the-sewn material, this is in the plane being parallel with plane of the Fig. 1 so that the desired lateral movement is achieved.
• the device according - folthe technical solution may replace the hypoidal gearing, possibly other tooth glaring with acceptable slippage of engaging teeth enabling coupling of two ⁇ skew and in the ground plan mutually perpendicular shafts, which is from the point, of view of lubrication, acquisition costs as well as maintenance very demanding.
• arrangement with gearing with toothed belt increases variability of the structural arrangement of the space in the box of sewing machine. Gearing by means of the toothed belt at the same time does not require any lubrication and it features a minimum operational noise.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Sewing Machines And Sewing (AREA)

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Publications (2)

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Citations (1)

Family Cites Families (7)

• 2009
  • 2009-03-24 CZ CZ200921020U patent/CZ19647U1/cs not_active IP Right Cessation
  • 2009-05-29 DE DE200920004870 patent/DE202009004870U1/de not_active Expired - Lifetime
  • 2009-05-29 DE DE102009025889A patent/DE102009025889A1/de not_active Withdrawn
• 2010
  • 2010-03-24 WO PCT/CZ2010/000033 patent/WO2010108460A2/en not_active Ceased

Patent Citations (1)

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