US20220325456A1 - Handling system for sewing machines - Google Patents

Handling system for sewing machines Download PDF

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Publication number
US20220325456A1
US20220325456A1 US17/764,897 US202017764897A US2022325456A1 US 20220325456 A1 US20220325456 A1 US 20220325456A1 US 202017764897 A US202017764897 A US 202017764897A US 2022325456 A1 US2022325456 A1 US 2022325456A1
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United States
Prior art keywords
handling system
needle bar
fixed
respect
crank
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Abandoned
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US17/764,897
Inventor
Carlo Guerreschi
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Vi Be Mac SpA
Original Assignee
Vi Be Mac SpA
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Publication date
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Assigned to VI.BE.MAC. S.P.A. reassignment VI.BE.MAC. S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUERRESCHI, CARLO
Publication of US20220325456A1 publication Critical patent/US20220325456A1/en
Abandoned legal-status Critical Current

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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B55/00Needle holders; Needle bars
    • D05B55/14Needle-bar drives

Definitions

  • the present invention refers, in general, to a handling system for sewing machines. More specifically, it is a needle bar handling system for a sewing machine.
  • the needles To make the sewing, the needles must pass through the fabric to be sewn and, for this purpose, the needle bar must move in a vertical direction in an oscillating way.
  • the needle bar is connected to a crank which is in turn eccentrically pivoted to a cylindrical element mounted coaxially on a rotating pin.
  • the purpose of this invention is to offer a needle bar handling system for a sewing machine, namely a handling system that can be easily adapted according to the thickness of the fabric to be sewn.
  • Another purpose of the invention is to significantly reduce the setting time of the needle bar stroke of a sewing machine to vary the thickness of the fabric to be sewn or for other needs.
  • Another purpose of the invention is to provide a handling system that is easy to manage.
  • a needle bar handling system of a sewing machine including a needle bar with a vertical shaft to which a crank, in turn connected to a cylindrical element, is connected.
  • the crank is connected to the cylindrical element by means of an adjustment device, the crank being pivoted with a pin to the adjustment device.
  • the adjusting device can adjust the position of the pin with respect to the axis of rotation of the rotating shaft, so as to move the crank and vary the length of the needle bar stroke.
  • the adjusting device comprises a fixed element permanently mounted on the cylindrical element, and a mobile element on which the crank is pivoted, the mobile element being fixable to the fixed element in variable positions.
  • the mobile element can be shifted with respect to the fixed element.
  • the mobile element can be moved with respect to the fixed element in a radial direction with respect to the cylindrical element.
  • the pivot through which the crank is pivoted to the moving element is always arranged on a radius of the cylindrical element.
  • At least one slotted hole can be made in the movable element, which develops in a radial direction with respect to the cylindrical element, the slotted hole being at least one that can be crossed by a screw that can be screwed into a threaded hole in the fixed element.
  • the fixed element can include two lateral shoulders between which the mobile element can move, so as to control the movement of the mobile element when adjusting its position with respect to the fixed element.
  • FIG. 1 is an axonometric view of a movement system, according to the invention, of the needle bar of a sewing machine;
  • FIG. 2 is a side view of the handling system in FIG. 1 .
  • FIG. 10 indicates a handling system of the needle bar of a sewing machine as a whole.
  • the handling system 10 includes a needle bar 12 including a vertical shaft 14 and three sewing needles 16 fixed below the vertical shaft 14 .
  • a crank handle 18 is connected to the vertical shaft 14 , which in turn is pivoted to an adjustment device 20 by means of a pin 19 .
  • the adjusting device 20 is fixed to a cylindrical element 22 mounted coaxially on a rotating shaft, not shown in the figures, but configured according to the known art.
  • the adjusting device 20 comprises a fixed element 24 and a movable element 26 .
  • the fixed element 24 is permanently mounted on the cylindrical element 22 by means of two first screws 28 and includes two side shoulders 30 .
  • the mobile element 26 which is received between the two side shoulders 30 , is fixed to the fixed element 24 by means of two second screws 32 which pass through two slotted holes 34 in the mobile element 26 .
  • This adjustment is possible because the translation of the mobile element 26 with respect to the fixed element 24 takes place in a radial direction with respect to the cylindrical element 22 .
  • the movement system 10 allows, therefore, to vary the length of the needle bar stroke easily and quickly, so as to adjust the action of one or more needles on the fabric as its thickness changes.

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

Abstract

This is a needle bar handling system for a sewing machine. More specifically, it is a handling system that allows the length of the needle bar stroke to be varied according to the thickness of the fabric to be sewn.

Description

  • The present invention refers, in general, to a handling system for sewing machines. More specifically, it is a needle bar handling system for a sewing machine.
  • As is well known, on sewing machines there is a needle bar formed by a shaft and one or more needles, fixed to the lower end of the shaft.
  • To make the sewing, the needles must pass through the fabric to be sewn and, for this purpose, the needle bar must move in a vertical direction in an oscillating way.
  • To achieve this movement, the needle bar is connected to a crank which is in turn eccentrically pivoted to a cylindrical element mounted coaxially on a rotating pin.
  • Depending on the thickness of the fabric to be sewn, it is necessary to have a different length of needle bar stroke. In particular, if the fabric is thick, the stroke must be longer than that required for sewing a thinner fabric.
  • Consequently, before sewing a new fabric with a different thickness than the one previously sewn, one or more changes must be made to the needle bar handling system and/or the needle bar itself.
  • In particular, these modifications can be
      • the replacement of the needle bar shaft with a shorter or longer shaft;
      • the replacement of the crank handle with a shorter or longer one;
      • the replacement of the cylindrical element on which the crank is pivoted so as to modify the distance between the axis of rotation of the rotating pin and the point of connection of the crank with the cylindrical element.
  • The time to be dedicated to these modifications can be significant and can significantly reduce the efficiency of the entire sewing machine, even if you choose to make only one replacement among those listed above.
  • There are also well-known needle bar handling systems that make it easier to set the needle bar itself, such as those disclosed in the CN 109 972 308 A and JP H07 51480 A patent documents.
  • The purpose of this invention is to offer a needle bar handling system for a sewing machine, namely a handling system that can be easily adapted according to the thickness of the fabric to be sewn.
  • Another purpose of the invention is to significantly reduce the setting time of the needle bar stroke of a sewing machine to vary the thickness of the fabric to be sewn or for other needs.
  • Another purpose of the invention is to provide a handling system that is easy to manage.
  • These and other purposes are achieved, according to the invention, by a needle bar handling system of a sewing machine including a needle bar with a vertical shaft to which a crank, in turn connected to a cylindrical element, is connected.
  • In particular, in the movement system according to the invention the crank is connected to the cylindrical element by means of an adjustment device, the crank being pivoted with a pin to the adjustment device.
  • According to this configuration the adjusting device can adjust the position of the pin with respect to the axis of rotation of the rotating shaft, so as to move the crank and vary the length of the needle bar stroke.
  • The adjusting device comprises a fixed element permanently mounted on the cylindrical element, and a mobile element on which the crank is pivoted, the mobile element being fixable to the fixed element in variable positions.
  • In particular, the mobile element can be shifted with respect to the fixed element.
  • Advantageously, the mobile element can be moved with respect to the fixed element in a radial direction with respect to the cylindrical element. In this way, the pivot through which the crank is pivoted to the moving element is always arranged on a radius of the cylindrical element.
  • At least one slotted hole can be made in the movable element, which develops in a radial direction with respect to the cylindrical element, the slotted hole being at least one that can be crossed by a screw that can be screwed into a threaded hole in the fixed element.
  • In addition, the fixed element can include two lateral shoulders between which the mobile element can move, so as to control the movement of the mobile element when adjusting its position with respect to the fixed element.
  • Further features and details can be better understood from the following description, given as a non-limiting example, as well as from the annexed drawing, wherein:
  • FIG. 1 is an axonometric view of a movement system, according to the invention, of the needle bar of a sewing machine;
  • FIG. 2 is a side view of the handling system in FIG. 1.
  • With reference to the attached figures, FIG. 10 indicates a handling system of the needle bar of a sewing machine as a whole.
  • The handling system 10 includes a needle bar 12 including a vertical shaft 14 and three sewing needles 16 fixed below the vertical shaft 14.
  • A crank handle 18 is connected to the vertical shaft 14, which in turn is pivoted to an adjustment device 20 by means of a pin 19.
  • The adjusting device 20 is fixed to a cylindrical element 22 mounted coaxially on a rotating shaft, not shown in the figures, but configured according to the known art.
  • The adjusting device 20 comprises a fixed element 24 and a movable element 26.
  • The fixed element 24 is permanently mounted on the cylindrical element 22 by means of two first screws 28 and includes two side shoulders 30.
  • The mobile element 26, which is received between the two side shoulders 30, is fixed to the fixed element 24 by means of two second screws 32 which pass through two slotted holes 34 in the mobile element 26.
  • Consequently, by loosening the two second screws 32, it is possible to move the mobile element 26 between the two side shoulders 30 of the fixed element 24 and modify the distance between the pin 19 and the center of the cylindrical element 22.
  • This adjustment is possible because the translation of the mobile element 26 with respect to the fixed element 24 takes place in a radial direction with respect to the cylindrical element 22.
  • In fact, the development of the slotted holes is in the radial direction with respect to the cylindrical element 22.
  • As this distance increases or decreases, the vertical shaft stroke 14 and therefore the entire needle bar 12 is increased or decreased respectively.
  • The movement system 10 according to the invention allows, therefore, to vary the length of the needle bar stroke easily and quickly, so as to adjust the action of one or more needles on the fabric as its thickness changes.

Claims (4)

1. Handling system for the needle bar of a sewing machine,
comprising a needle bar with a vertical shaft to which a crank is connected which in turn is connected to a cylindrical element which is fixed coaxially to a rotating shaft, wherein the crank is connected to the cylindrical element by means of an adjustment device, the crank being pivoted with a pin to the adjustment device, the adjustment device being adapted to adjust the position of the pin with respect to the rotation axis of the rotating shaft;
wherein the adjustment device comprises a fixed element which is mounted stably on the cylindrical element, and a movable element to which the crank is pivoted, the movable element being fixable to the fixed element in variable positions;
wherein the movable element is translatable with respect to the fixed element;
characterized by the fact that at least one slotted hole is formed in the movable element, the at least one slotted hole being penetrable by a screw to be screwed into a threaded hole formed in the fixed element.
2. Handling system according to claim 1, wherein the movable element is translatable with respect to the fixed element according to a radial direction with respect to the cylindrical element.
3. Handling system according to claim 1, wherein the at least one slotted hole develops according to a radial direction with respect to the cylindrical element.
4. Handling system according to claim 1, wherein the fixed element includes two lateral shoulders between which the movable element can move.
US17/764,897 2019-10-01 2020-09-30 Handling system for sewing machines Abandoned US20220325456A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT102019000017627 2019-10-01
IT201900017627 2019-10-01
PCT/IB2020/059133 WO2021064583A1 (en) 2019-10-01 2020-09-30 Handling system for sewing machines

Publications (1)

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US20220325456A1 true US20220325456A1 (en) 2022-10-13

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US17/764,897 Abandoned US20220325456A1 (en) 2019-10-01 2020-09-30 Handling system for sewing machines

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US (1) US20220325456A1 (en)
EP (1) EP4038230B1 (en)
JP (1) JP2022554073A (en)
CN (1) CN114502789A (en)
MX (1) MX2022003955A (en)
WO (1) WO2021064583A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839972A (en) * 1973-05-03 1974-10-08 Singer Co Adjustable stroke mechanism for tufting machines
US3919952A (en) * 1973-07-11 1975-11-18 Pickering Edgar Ltd Looper or needle eccentric adjustment means for tufting machines
US4542707A (en) * 1983-07-19 1985-09-24 Pfaff Industriemaschinen Gmbh Sewing machine having auxiliary work turning needle
US4616585A (en) * 1985-05-27 1986-10-14 Rockwell-Rimoldi S.P.A. Device providing for three sewing machine needle strokes
US4867083A (en) * 1987-04-30 1989-09-19 Rimoldi S.R.L. Modular sewing machine arranged to control auxiliary devices
US5007355A (en) * 1988-08-10 1991-04-16 Kabushiki Kaisha Iida Leather or similar work sewing machine having flat-needle controller and sewing method by use of the sewing machine
US5320053A (en) * 1991-09-30 1994-06-14 Tuftco Corp. Demountable rotary cam for tufting machine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1122608B (en) * 1979-07-18 1986-04-23 Rockwell Rimoldi Spa NEEDLE DRIVE DEVICE OF A SEWING MACHINE
JPH0751480A (en) * 1993-08-19 1995-02-28 Brother Ind Ltd Mechanism for needle bar of sewing machine
US5881663A (en) * 1995-10-09 1999-03-16 Juki Corporation Method of tying a knot in chain stitching
US6499415B1 (en) * 2000-05-05 2002-12-31 Sailrite Enterprises, Inc. Zigzag sewing machine
JP2002210280A (en) * 2001-01-23 2002-07-30 Juki Corp Needle swing sewing machine
JP3646067B2 (en) * 2001-01-26 2005-05-11 ペガサスミシン製造株式会社 Sewing machine needle bar stroke changing device
IT1391048B1 (en) * 2008-07-04 2011-10-27 Vi Be Mac Spa SEWING MACHINE
DE102009004217A1 (en) * 2009-01-09 2010-07-15 Dürkopp Adler AG Two-needle sewing machine
CN202323353U (en) * 2011-11-24 2012-07-11 温州市亨泰缝制设备有限公司 Needle bar swing driving mechanism of eyelet buttonhole sewing machine
CN203360800U (en) * 2013-05-20 2013-12-25 浙江宝石机电股份有限公司 Needle bar stroke changeable mechanism of sewing machine
CN109972308B (en) * 2019-04-11 2021-11-02 杰克缝纫机股份有限公司 Needle bar stroke adjusting structure, sewing machine with needle bar stroke adjusting structure and stroke adjusting method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839972A (en) * 1973-05-03 1974-10-08 Singer Co Adjustable stroke mechanism for tufting machines
US3919952A (en) * 1973-07-11 1975-11-18 Pickering Edgar Ltd Looper or needle eccentric adjustment means for tufting machines
US4542707A (en) * 1983-07-19 1985-09-24 Pfaff Industriemaschinen Gmbh Sewing machine having auxiliary work turning needle
US4616585A (en) * 1985-05-27 1986-10-14 Rockwell-Rimoldi S.P.A. Device providing for three sewing machine needle strokes
US4867083A (en) * 1987-04-30 1989-09-19 Rimoldi S.R.L. Modular sewing machine arranged to control auxiliary devices
US5007355A (en) * 1988-08-10 1991-04-16 Kabushiki Kaisha Iida Leather or similar work sewing machine having flat-needle controller and sewing method by use of the sewing machine
US5320053A (en) * 1991-09-30 1994-06-14 Tuftco Corp. Demountable rotary cam for tufting machine

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Publication number Publication date
MX2022003955A (en) 2022-04-25
EP4038230B1 (en) 2024-01-10
CN114502789A (en) 2022-05-13
JP2022554073A (en) 2022-12-28
WO2021064583A1 (en) 2021-04-08
EP4038230A1 (en) 2022-08-10

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Effective date: 20220329

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