EP2796605A1 - Operativer Kopf für eine Nähmaschine - Google Patents

Operativer Kopf für eine Nähmaschine Download PDF

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Publication number
EP2796605A1
EP2796605A1 EP14165550.6A EP14165550A EP2796605A1 EP 2796605 A1 EP2796605 A1 EP 2796605A1 EP 14165550 A EP14165550 A EP 14165550A EP 2796605 A1 EP2796605 A1 EP 2796605A1
Authority
EP
European Patent Office
Prior art keywords
needle
operative
thread
storage area
thread guide
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.)
Withdrawn
Application number
EP14165550.6A
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English (en)
French (fr)
Inventor
Massimo Cameran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sardella Mose'
Original Assignee
Sardella Mose'
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sardella Mose' filed Critical Sardella Mose'
Publication of EP2796605A1 publication Critical patent/EP2796605A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B55/00—Needle holders; Needle bars
    • D05B55/14—Needle-bar drives
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/16—Arrangements for repeating thread patterns or for changing threads

Definitions

  • the present invention refers to an operative head for a sewing machine, according to the preamble of the main independent claim.
  • the head in question advantageously intended to be used in industrial sewing machines, of the automatic or semi-automatic type, operating with or without the help of a sewing operator with respect other fabrics of different material, such as for example cotton, skin and synthetic materials, as well as with threads of different colors and dimensions and materials such as nylon or cotton.
  • the head in question thus applies to the sector of the manufacturing industry for the for making sewing machines or accessories and parts of sewing machines.
  • operative heads mounted on a sewing machine provided with a single sewing needle susceptible to sew with un thread unwound from a reel the fabrics that move below it.
  • the needle is cyclically guided with kinematic movement mechanism back and forth to traverse the fabrics, to release the sequence of required points thereon.
  • a first drawback lies in the fact that it is quite expensive given that it substantially requires the use of two heads instead of one.
  • a second drawback lies in the fact that there can be managed only two different needles, when the needs that are observed in the production process usually require the possibility of using more than two needles.
  • a third drawback lies in the fact that both heads use a single thread tensioner and hence the thread changing operation, for example for mounting a thread with different color or characteristics, remains long and tedious given that it is however needed to unarm the thread tensioner from the previous thread and arm it again with the new thread.
  • each needle is fixed to a corresponding moving rod which is susceptible, when it is placed in the operative position by the turning drum, to engage a carriage which is positioned alongside of the drum and is actuated to slide on a vertical guide for moving cyclically the needle during weaving operations.
  • a drawback of the machine described in the patent US 2007/0074646 lies in the fact that the operative head cannot perform reliably the change of the thread in particular since the carriage engages with difficulty the moving rod of the needle placed in the operative position.
  • the main object of the present invention is to overcome the drawbacks of the prior art by providing an operative head for a sewing machine, which allows changing the thread and/or the needle to be used, in a simple and quick manner.
  • Another object of the present invention is to provide an operative head for a sewing machine, which allows changing the work setting with different fabrics in a simple and quick manner.
  • Another object of the present invention is to provide an operative head for a sewing machine, that is extremely safe for the operators and highly reliable in use.
  • the aforementioned head 1 may be mounted, in a per se entirely conventional manner, on an industrial sewing machine, whether of the entirely automatic type without utilizing the operator, or of the semi-automatic type operating with the help of an operator.
  • the fabric is made to advance, in a known manner, below a pressure foot of the fabric (not illustrated) mounted on the operative head at the needle, by a fabric drawing mechanism, which usually uses grippers which grip the drawing it under the foot.
  • the aforementioned operative head 1 shall be adapted to sew a fabric which advances below it with an intermittent motion with subsequent steps, inserting the needle into the fabric when it is temporarily stationary and with continuous motion by inserting the needle into the fabric during its advancement motion.
  • fabric shall be used to indicate one or more flexible sheet-like elements intended to be connected with respect to each other with the sewing points, whether superimposed or arranged adjacent to each other, distinct of part of a single sheet and constituted by various types of material such as, by way of example: cotton, skin or synthetic fiber.
  • a system for controlling the trajectory to be sewn is of the known pantograph type with templates for delimiting the area to be sewn.
  • the operative head 1 for a sewing machine subject of the present invention comprises a support structure 2 which is fixed being susceptible to be rigidly mounted on the framework of the sewing machine (not illustrated in its entirety).
  • the head 1 is thus provided in an entirely conventional manner with a first kinematic movement mechanism 3 for guiding at least one sewing needle 4 cyclically with a back and forth movement through at least one fabric so as to attain a succession of sewing points with at least one thread.
  • the first kinematic movement mechanism 3 of the needle 4 may be obtained according to any kinematic sequence of the known type, and thus it shall not be described in detail given that it is known to a man skilled in the art. It turns into a final vertical movement of a needle 4 between a top dead centre and a bottom dead centre and it may, for example, provide for the use of drive shaft bearing an eccentric which actuates one or more connecting rods adapted to slide a control rod associated to the needle 4 along a vertical track as better described hereinafter.
  • the needle 4 should follow the fabric, the needle shall assume a movement made up of a vertical movement and a horizontal movement.
  • the head 1 comprises a storage area 7, which is mounted rotatably on the support structure 2 and it is actuatable to rotate around a vertical rotation axis Y in order to assume different angular positions P1-P4 (where in figures 11A and 11B there are illustrated the positions P1, P3 given that the others are easily deducible without requiring further graphic description).
  • two or more guide tubes 8 in particular formed by vertical through holes, which are arranged along a coaxial circular trajectory with respect to the rotation axis Y.
  • Each of the guide tubes 8 housed a needle-carrier rod 6 bearing, mounted at the lower part thereof, the corresponding needle 4.
  • the aforementioned storage area 7 is a rigid body for example made of cast iron obtained through casting substantially cylindrical substantially operating like a revolver.
  • the aforementioned storage area 7 is a rigid body for example made of cast iron obtained through casting substantially cylindrical substantially operating like a revolver.
  • Each needle-carrier rod 6 may bear a needle of different type, for example for operating with fabrics of different type, or it may be mechanically and operatively associated to a thread of different mechanical characteristics or of different color, as better clarified hereinafter.
  • the aforementioned first kinematic movement mechanism 3 comprises a control rod 9, which extends along a vertical extension axis Y', parallel to the rotation axis Y of the storage area 7.
  • the aforementioned control rod 9 has an angular position fixed and predefined with projection on a horizontal plane R passing through the storage area 7 (for example, for the sake of simplicity, reference shall be made to the plane R having - as the laying plane - the upper face of the storage area 7) which intercepts the circular trajectory traversed by the needle carrier rods 6.
  • the storage area 7 is in turn actuatable to rotate around its vertical rotation axis Y, between the aforementioned angular positions P1-P4 in order to selectively bring each needle-carrier rod 6 (through the movement of the relative guide tubes 8) in an operative position A arranged aligned below the control rod 9.
  • first coupling means 10 susceptible to mechanically connect with respect to each other the first lower end 9' of the control rod 9 with the second upper end 6' of the needle-carrier rod 6 which is arranged in the aforementioned operative position A.
  • control rod 9 and the needle-carrier rod 6 are both cylindrical-shaped and with the same diameter so as to form a substantially continuous rod after the coupling through the first coupling means 10.
  • the first coupling means 10 comprise two engagement portions 10', 10", a first 10' associated to the second upper end 6' of the needle-carrier rod 6 and a second 10" to the first lower end 9' of the control rod 9.
  • the aforementioned engagement portions 10', 10" are susceptible to be coupled with respect to each other in relationship form relationship following the rotation movement of the corresponding needle-carrier rod 6 in the operative position A.
  • the first engagement portion 10' associated to the upper end 6' of the needle-carrier rod 6 is obtained with a first circumferential opening 60 delimited above and below by two first flat faces 61,62, which are advantageously approached inclined towards the central rotation axis of the storage area 7 tapering the first circumferential opening 60.
  • the aforementioned first opening 60 delimits a mush-room shaped upper body having the head 63 with the top part face 65, for example flat, and which defines a constraint undercut for the corresponding second engagement portion 10" of the control rod 9.
  • a mushroom-shaped upper body has a first shank 64 connected to the head 63 which rises misaligned with respect to the axis of the needle-carrier rod 6 from the lower flat face of the opening 60.
  • the aforementioned head 63 and the aforementioned first shank 64 each have a convex arc-shaped circumferential face.
  • the second engagement portion 10" of the control rod 9 is in turn substantially counter-shaped with respect to the first engagement portion 10' associated to the needle-carrier rod 6.
  • the second engagement portion 10" is provided with a second circumferential opening 90 which is delimited by two second inclined flat faces 91, 92 and which is tapered towards the central axis of rotation of the storage area 7.
  • the aforementioned second opening 90 delimits a lower base 93 connected through a second shank 94 to the remaining part of the control rod 9. More in detail, the lower base 93 is inserted into the circumferential opening 60 with its own bottom face 95 which is opposite to the first lower flat face 62 of the first circumferential opening 60 and with the second lower flat face 92 of the second circumferential opening 90 which is opposite to the first upper flat face 61 of the first circumferential opening 60.
  • the head 63 of the first engagement portion 10' in turn has the top part face 65 opposite to the second upper flat face 91 of the second circumferential opening 90 and the first upper flat face 61 opposite to the second lower flat face 92 of the second circumferential opening 90.
  • the aforementioned base 93 and the aforementioned second shank 94 each have a circumferential concave arc-shaped face for coupling, by rotation, respectively with the aforementioned first shaft 64 and with the aforementioned head 63 of the first engagement portion 10'.
  • the coupling through the first coupling means 10 between the first lower end 9' of the control rod 9 and the second upper end 6' of the needle-carrier rod 6 is defined with the needle-carrier rod 6 arranged in the operating angular position A, and with the control rod 9, arranged by the first kinematic mechanism, at the top dead centre.
  • Such top dead centre of the control rod 9 corresponds to a top dead centre also of the needle 4 and of the relative needle-carrier rod 6.
  • first drive means 11 mounted on the support structure 2.
  • first drive means 11 preferably comprise a vertical drive shaft 12, engaged in a shaft guide bushing 13, and actuated to rotate by a first motor 14 fixed to the support structure 2.
  • the drive shaft 12 is fixed - at the lower part - to the storage area 7, coaxially with respect to its rotation axis Y, and it is mechanically connected at the upper part to the first motor 14, which commands the controlled rotation through a logic control unit, of the storage area 7, in order to selectively bring each of the needle carrier rods 6 in the engagement operative position A with the control rod 9.
  • the shaft 12 terminates - at the lower part - with a threaded portion engaged by an adjustment ring nut 22 which defines the constraint position of the storage area 7 on the shaft 12 and which is provided for adjusting the height of the storage area 7.
  • such support means comprise a support ring 15, which is mechanically connected to the support structure 2, arranged coaxially to the drive shaft 12 internally with respect to the tubes 8 and it is provided with a circumferential external edge 15' having a cut portion 16 arranged at the operative position A.
  • Such external edge 15' is engaged with a groove 160 provided in the needle carrier rods 6, obtained at their radially innermost portion directed towards the central axis Y of rotation of the storage area 7, when the needle carrier rods 6 are at angular positions different from operating position A.
  • the support ring 15 supports the needle carrier rods 6 which are not operative preventing them from falling, while through the cut portion 16 it frees the sliding of the needle-carrier rod 6 which is in operative position A and which is moved to slide in the tube 8 of the storage area 7 by the control rod 9.
  • the logic control unit of the sewing machine rotatably controls the storage area 7 by actuating the first motor 14 which rotates in a controlled manner up to reaching the angular position adapted to bring the needle-carrier rod 6 with the selected needle 4, up to the operative position A.
  • the mechanical engagement of the needle-carrier rod 6 with the control rod 9 by engaging the coupling means 10 and simultaneously disengaging the needle-carrier rod 6 from the support means for example constituted by the support ring 15.
  • the needle-carrier rod 6, which was previously in operative position A is now disengaged from the control rod 9, and taken over by support means to prevent them from slipping off from the relative tube 8.
  • the support ring 15 is mounted on the support structure 2 through a linear actuator 17 which through return mechanisms 170 determines the movement thereof between a safety position 18, in which the tips of the needles 4 mounted on the needle carrier rods 6 which are not in operative position A are lifted, and in particular retracted inside the tubes 8 of the storage area 7, and a substitution position 19, in which the tips of the needles 4 of the needle carrier rods 6 which are not in operative position A are lowered, and in particular extend at the lower part outside the guide tubes 8.
  • the return mechanisms 170 in particular comprise a rod 171 fixed at the lower part to the support ring 15 passing in a vertical milling thereof and mechanically connected to the stem 17' of the actuator 17 through a transverse retention block 172.
  • the lowered substitution position 19 of is provided during the operations provided for by the alternation in operative position A of a needle-carrier rod with another, while the raised safety portion 18 is provided for the normal work operations and sewing of the fabric by the operative head 1.
  • the safety position 18 allows the operator not to interfere with the tips of the needles 4 not operative when working near the operative needle 4 during the fabric sewing operations.
  • the needle carrier rods 6 and the guide tubes 8 are respectively provided: one with a groove 20, the other with a rib 21 engaged with respect to each other in form relationship.
  • the operative head 1 comprises a thread tensioner group 24 adapted to fed each needle 4 with a dedicated thread and correctly tensioned by a distinct thread guide so as to prevent it - upon changing the needle 4 - to correspond to a tedious operation of setting up the thread on the new needle 4 through prior unarming of the previous thread, for example, like in the known art, by a common thread guide.
  • each needle 4 there is actually advantageously associated a dedicated thread-guide contained in the thread tensioner group 24.
  • the thread tensioner group 24 comprises two or more thread guide levers 25, each of which is provided with an eyelet 26 to receive the thread which is unwound from a corresponding reel (not illustrated), and a second kinematic movement mechanism 27 provided with a movement lever 28 selectively mechanically couplable with one of the thread guide levers 25 to impart thereto a second back and forth movement having at least one vertical component between a top dead centre and a bottom dead centre.
  • the thread guide lever 25 is actuated to be moved by the movement lever 28 with a cyclic following movement of the needle 4 mounted on the needle-carrier rod 6 in operative position A, in order to feed it with the thread under tension which passes through the eyelet 26 of the corresponding thread guide lever 25.
  • the thread tensioner group 24 further comprises a carriage 29 provided with a plurality of parallel shoulders 30. Between each pair of shoulders 30 there is housed a corresponding thread guide lever 25.
  • the carriage 29 is susceptible to slide on the support structure 2 in order to selectively bring each thread guide lever 25 at a work window 31, in which through second coupling means 32 it is mechanically engaged to the movement lever 28 of the second kinematic movement mechanism 27.
  • the second coupling means 32 comprise two portions shaped in form relationship 32', 32" one 32' associated to the thread guide lever 25 and the other 32" to the movement lever 28 of the second kinematic movement mechanism 27.
  • the two shaped portions 32', 32" are susceptible to be engaged with respect to each other following the linear movement of the thread guide lever 25, guided by the carriage 29, in the work window 31.
  • the second coupling means 32 are advantageously susceptible to engage the two shaped portions 32', 32" with the thread guide lever 25 arranged in the work window 31 and at the aforementioned top dead centre.
  • second drive means 33 mounted on the support structure 2.
  • Such second drive means 33 preferably comprise a worm screw 36 and a second motor 34 fixed to the support structure 2 mechanically connected to the worm screw 36 to rotate it around its longitudinal development axis.
  • the worm screw 36 is mounted rotatably between two spaced and parallel walls 35 which delimit the travel of the carriage 29 and it is engaged with at least one nut (not illustrated) integral to the carriage 29.
  • the second motor 34 by actuating the worm screw 36 in rotation controls the precise movement and in a controlled manner, through the logic control unit, of the carriage 29 so as to selectively move each thread guide lever 25 at the work window 31.
  • the second motor 34 is in axis with the worm screw 36 while according to the embodiment of the remaining figures, in particular as shown in figures 1 and 2 , the motor 34 rotates the worm screw 36 through belt transmission means 37.
  • means for guiding the movement of the carriage 29 for example comprising a sliding wall of the carriage 29 on a fixed wall of the support structure 2 or comprising a horizontal guide rod 38 mounted fixed between the two parallel walls 35 and fittingly passing in a hole obtained on the carriage 29 and in particular in aligned holes on the lateral walls of the carriage 29.
  • Such guide means counter the rotation of the carriage 29 around the axis of the worm screw 36 thus allowing the carriage 29 to perform just a simple translation.
  • At least one pair of support rods 39 which are fixed to the support structure 2 so as to have the relative free ends 40 opposite and aligned.
  • Such rods 39 extend through the carriage 29 starting from the parallel walls 35 traversing provided aligned holes obtained respectively on the shoulders 30 and on the thread guide levers 25 up to reaching with the free ends 40 thereof the limit of the work window 31, to support the thread guide levers 25 outside the work window 31 i.e. when the thread guide levers 25 are not engaged and supported by the movement lever 28.
  • such two pairs of support rods have different length (for example the lower pair being longer than the upper one) for engaging/disengaging the holes of the thread guide levers 25 in different positions during the movement of the carriage 29.
  • the free ends 40 of the support rods 30, faced towards the work window 31, are with tapered shape.
  • each needle 4 of a needle-carrier rod 6 there corresponds a thread prearranged on a corresponding thread guide lever 25 of the thread tensioner group 24.
  • the logic control unit controls the rotation of the storage area 7 to bring the needle-carrier rod 6 which mounts the selected needle 4 in the operative position A, and also controls the translation of the carriage 29 to bring the thread guide lever 25 associated to the thread of the selected needle 4, at the work window 31.
  • the thread guide lever 25 Upon reaching the window 31 the thread guide lever 25 is progressively engaged with the relative movement rod 28 and it is progressively disengaged from the support rods 39 whose tapered shape simultaneously allows the thread guide lever 25, which should be replaced, to be progressively inserted on the rods 39 placed on the side towards which the carriage 29 is sliding.
  • the clearance allowed by the tapered shape of the free ends 40 of the support rods 39 allows adjustments in the engagement between the two portions shaped in form relationship 32', 32" one 32' associated to the thread guide lever 25 and the other 32" to the movement lever 28.
  • the operative head thus conceived attains the preset objects.
  • the needle and thread change times are extremely short, i.e. in particular in the order of a few seconds and they do not require a particular intervention of operators given that the entire change operation is managed through a control logic which acquiring the angular position of the main drive axis synchronizes the actuation respectively of the storage area which carries the needle carrier rods and the slidable drawer of the thread-tensioner.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP14165550.6A 2013-04-23 2014-04-23 Operativer Kopf für eine Nähmaschine Withdrawn EP2796605A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000109A ITPD20130109A1 (it) 2013-04-23 2013-04-23 Testa operativa per macchina da cucire

Publications (1)

Publication Number Publication Date
EP2796605A1 true EP2796605A1 (de) 2014-10-29

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Family Applications (1)

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EP14165550.6A Withdrawn EP2796605A1 (de) 2013-04-23 2014-04-23 Operativer Kopf für eine Nähmaschine

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EP (1) EP2796605A1 (de)
IT (1) ITPD20130109A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108589080A (zh) * 2018-07-17 2018-09-28 张章生 一种缝纫机及其针杆旋转直驱机构
CN111304842A (zh) * 2020-03-06 2020-06-19 邹仁员 一种基于光感控制的缝纫机线型转换以及自动剪线装置
CN111364180A (zh) * 2020-04-10 2020-07-03 诸暨轻工时代机器人科技有限公司 单电机360度全方位梭式毛巾装置
CZ308429B6 (cs) * 2018-12-11 2020-08-12 Amf Reece Cr, S.R.O. Způsob šití imitací rukávových dírek dvěma různými nitěmi dvoujehlovým šicím strojem se dvěma jehelními tyčemi a zařízení k jeho provádění
CN112226926A (zh) * 2020-10-24 2021-01-15 深圳市雅诺科技股份有限公司 一种缝纫机的针杆旋转机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118403A (en) * 1964-01-21 chambers
US5390613A (en) * 1993-06-29 1995-02-21 Kabushikikaisha Barudan Multi-needle embroidering machine with thread color changing mechanism
WO2003025273A1 (en) * 2001-09-20 2003-03-27 Meca Spa Device to change the color of the thread on quilting/embroidering machines, relative method and relative quilting/embroidering machine
US20070074646A1 (en) 2005-09-30 2007-04-05 Modra Timothy J Carpet making machinery
EP2565313A1 (de) * 2011-08-31 2013-03-06 JUKI Corporation Doppelnadel-Nähmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118403A (en) * 1964-01-21 chambers
US5390613A (en) * 1993-06-29 1995-02-21 Kabushikikaisha Barudan Multi-needle embroidering machine with thread color changing mechanism
WO2003025273A1 (en) * 2001-09-20 2003-03-27 Meca Spa Device to change the color of the thread on quilting/embroidering machines, relative method and relative quilting/embroidering machine
US20070074646A1 (en) 2005-09-30 2007-04-05 Modra Timothy J Carpet making machinery
EP2565313A1 (de) * 2011-08-31 2013-03-06 JUKI Corporation Doppelnadel-Nähmaschine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108589080A (zh) * 2018-07-17 2018-09-28 张章生 一种缝纫机及其针杆旋转直驱机构
CZ308429B6 (cs) * 2018-12-11 2020-08-12 Amf Reece Cr, S.R.O. Způsob šití imitací rukávových dírek dvěma různými nitěmi dvoujehlovým šicím strojem se dvěma jehelními tyčemi a zařízení k jeho provádění
CN111304842A (zh) * 2020-03-06 2020-06-19 邹仁员 一种基于光感控制的缝纫机线型转换以及自动剪线装置
CN111364180A (zh) * 2020-04-10 2020-07-03 诸暨轻工时代机器人科技有限公司 单电机360度全方位梭式毛巾装置
CN111364180B (zh) * 2020-04-10 2023-08-29 诸暨轻工时代机器人科技有限公司 单电机360度全方位梭式毛巾装置
CN112226926A (zh) * 2020-10-24 2021-01-15 深圳市雅诺科技股份有限公司 一种缝纫机的针杆旋转机构
CN112226926B (zh) * 2020-10-24 2022-05-06 深圳市雅诺科技股份有限公司 一种缝纫机的针杆旋转机构

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