EP1645673A1 - Sewing needle mounting structure and sewing needle - Google Patents

Sewing needle mounting structure and sewing needle Download PDF

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Publication number
EP1645673A1
EP1645673A1 EP04746463A EP04746463A EP1645673A1 EP 1645673 A1 EP1645673 A1 EP 1645673A1 EP 04746463 A EP04746463 A EP 04746463A EP 04746463 A EP04746463 A EP 04746463A EP 1645673 A1 EP1645673 A1 EP 1645673A1
Authority
EP
European Patent Office
Prior art keywords
needle
sewing needle
sewing
stopper
component
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Withdrawn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
EP04746463A
Other languages
German (de)
English (en)
French (fr)
Inventor
Shuji c/o WACOAL CORP. SAKAKI
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.)
Wacoal Corp
Original Assignee
Wacoal Corp
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 Wacoal Corp filed Critical Wacoal Corp
Publication of EP1645673A1 publication Critical patent/EP1645673A1/en
Withdrawn legal-status Critical Current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
    • D05B55/02—Devices for fastening needles to needle bars
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/02—Needles with slotted eyes, i.e. with a slit leading to the eye for thread insertion

Definitions

  • the present invention relates to a sewing needle mounting structure and a sewing needle using the structure thereof, and in more detail, a sewing needle mounting structure to minimize possibility of needle breakage and a sewing needle.
  • a sewing needle mounting structure in a conventional sewing machine comprises a mounting opening formed on a needle stopper to allow a sewing needle to be freely inserted therein from beneath as well as a needle locking mechanism to lock the sewing needle inserted into said mounting opening with the needle stopper.
  • Said needle locking mechanism comprises a pin-shaped contact component, which is laterally inserted into the needle stopper in a direction perpendicular to the sewing needle, and its position can move back and forth through a screw mechanism by using a finger.
  • the needle locking structure has a structure, in which a contact component moves forward to push its pointed tip into a space between the sewing needle and a wall surface of said mounting opening to generate a frictional force to lock the sewing needle with the needle stopper.
  • a vertical position of the sewing needle is determined by inserting it into the mounting opening until its tip contacts an apex of the opening, thus preventing the sewing needle from upward movement and securing the sewing needle with an upward external force to prevent its displacement.
  • Patent reference 1 Japan Patent H11-309288.
  • a biggest problem in mass production of sewing products with an industrial sewing machine is a breakage of a sewing needle. That is, if an unusual force (mostly upward force) is exerted onto a sewing needle, a conventional sewing needle mounting structure mentioned above does not allow the sewing needle to move upward against a needle stopper nor relieve an excess force, resulting in bending and breaking of the needle. When just bent, the needle can be simply replaced. However, when broken, it becomes very inconvenient.
  • a purpose of the present invention is aimed at minimizing possibility of breakage of the needle as much as possible, eliminating collection work of the broken needle consuming a long hour, and drastically improving production efficiency rather than improving efficiency with a collection work of the broken needle by modifying a mounting structure of the sewing needle.
  • the sewing needle mounting mechanism comprises an elastic component installed on the needle stopper and a contact component to push the sewing needle from the side by its elastic force.
  • This sewing needle locking mechanism is further characterized with the contact component, which elastically contacts the sewing needle to lock but releases its locked state, if an upward force higher than a desired value is exerted onto the sewing needle, and with the mounting opening, which is elongated upward to a position longer than a length required for inserting the sewing needle into a normal mounting position.
  • composition of Claim 2 is characterized, in composition of Claim 1, with said needle locking mechanism, which comprises an elastic component installed on said needle stopper and a contact component to push said sewing needle from side by its elastic force.
  • composition of Claim 3 is characterized, in composition of Claim 1, with said needle locking mechanism, which comprises a component to fit with an outside of said needle stopper by an elastic force and a contact component to push said sewing needle from side by its elastic force.
  • Composition of Claim 4 is characterized, in composition of Claim 2 or 3, with said contact component, which elastically pushes said sewing needle.
  • Composition of Claim 5 is characterized, in composition of Claim 4, with said elastic component, which can change a pushing force to said contact component, allowing an easy change and adjustment of a threshold value of an upward force for shifting said sewing needle for relief.
  • composition of Claim 6 is characterized, in composition of Claim 4 or 5, with the tip of said contact component, which is conically pointed.
  • Composition of Claim 7 is characterized, in composition of any one of Claims 1 to 6, with a depressed section formed on said sewing needle, which has conically concave geometry.
  • composition of Claim 8 is characterized, in composition of Claim 1, with said needle locking mechanism, which comprises a clip-shaped elastic contact component, wherein said contact component is composed of a component to contact an outside of said needle stopper by an elastic force and a component to clip said sewing needle from side by an elastic force.
  • Composition of Claim 9 is characterized, in composition of any one of Claims 1 to 8, with said needle locking mechanism, which is installed in two places.
  • Composition of Claim 10 is characterized with a sewing needle, which is composed of a needle section with an eye, a handle section with a diameter larger than that of the needle section and capable to freely insert into the needle stopper, and a joint section between the needle and handle sections, wherein a depressed section is formed on said handle section in order to determine its position by allowing the contact component on said needle stopper to fit.
  • a sewing needle which is composed of a needle section with an eye, a handle section with a diameter larger than that of the needle section and capable to freely insert into the needle stopper, and a joint section between the needle and handle sections, wherein a depressed section is formed on said handle section in order to determine its position by allowing the contact component on said needle stopper to fit.
  • composition of Claim 11 is characterized, in a composition of Claim 10, with the depressed section formed on said sewing needle, wherein its geometry is conically concave.
  • composition of claim 12 is characterized, in composition of Claim 10, with the depressed section formed on said sewing needle, wherein its shape is grooved.
  • a sewing machine comprises a sewing machine head section a, a support section b, built above one end of this head section a, and an arm section c, extended from a top end of this support section, b to an upper side of the head section, a.
  • a sewing section A is installed such that a sewing operation is freely run together with a sewing machine bench 4 next to the head section a.
  • This sewing machine has a sewing section A, with a function preventing a sewing needle 3 from breakage as much as possible by shifting the needle upward against a needle stopper 6 inserted with the sewing needle 3, if a large upward force is exerted onto the sewing needle 3.
  • This structure can avoid most of needle breakage caused by various factors and substantially reduce work, labor and time to find broken fragments of the needle.
  • a sewing section A which shows a desirable function in preventing a needle from breakage will be described in further detail below.
  • the sewing section A comprises a holddown rod 2 with a cloth hold down component 1 at a lower end, a sewing needle 3 capable with a vertical movement in front of this hold down-rod 2 as well as an eye of needle (figure omitted) on a needle plate 5 on a sewing machine bench 4 disposed beneath the sewing needle 3, which is allowed to move downward into the eye.
  • the sewing needle 3 is tied with a needle stopper 6 and the needle stopper 6, is supported by a detachable support rod 7 installed on the sewing machine head section a.
  • the needle stopper 6 is composed of a body section of a roughly tubular rod 6A mounted on the support rod 7 and an angulated tubular aluminum alloy protrusion 6B sticking out sideways near a lower end of the body section.
  • a part of circumference of a rod body section 6A is cut off into a roughly D shape in cross-section.
  • the body section of rod is drilled to form a vertical through hole 8 to mount a needle and a lateral hole 9 is formed on the protrusion 6B to lock the sewing needle.
  • the sewing needle mounting hole is expressed as "mounting hole", because a sewing needle mounting hole 8, vertically runs through. However, this is, of course, one of embodiments for "mounting opening".
  • the mounting hole 8 is drilled into its pore diameter basically slightly larger than an outer diameter of the sewing needle 3 in order to freely insert and firmly support the sewing needle 3 with little wobbling.
  • An upper section of the mounting hole is, however, drilled in a diameter clearly larger than an outer diameter of the sewing needle 3, to form a loose-fitting opening 8a.
  • the support rod 7 has a loose-fitting opening 7a next to the loose-fitting hole 8a.
  • a lateral hole 9 is equipped with a needle locking mechanism B, to attach and lock the sewing needle 3 inserted into the mounting hole 8 in a desired height and direction for operation.
  • the needle locking mechanism B comprises a piston, 10 (an example of a contact component) inserted into the lateral hole 9 to freely slide horizontally, a knob 11 integrated with a front end of the piston 10, and an externally coiled spring, 12 (an example of an elastic component) around the piston part 10 inside the lateral hole 9.
  • This needle mounting mechanism B directs the sewing needle 3 to face an eye of a needle 3a at a tip to a predetermined direction and guides the needle to be inserted in a desired depth (i.e. a desired height against a needle plate 5) against the needle stopper 6, thus showing a locking function.
  • the piston 10 comprises a head 10A, tightly fit into the lateral hole 9 and a shaft 10B tightly fit into a smaller diameter section 9a of the lateral hole at the protrusion end.
  • the shaft 10B is wound with a coiled spring 12.
  • a triangularly pointed action apex 10a (an example of a pointed section) is formed at a front end of the head 10A and a base end 11b is formed at a front end of the protrusion 6B in the shaft 10B to push in the knob 11 to mount.
  • the coiled spring 12 pushes the head 10A in the direction of the mounting hole 8 (right direction in Figure 2) and the knob 11 touches a front 6b of the protrusion 6B, when the sewing needle 3 is not inserted into the mounting hole as being unrestricted.
  • a knob 11 is held by a finger to freely slide and return the piston 10 to the outer direction (left direction in Figure 2) against a force associated with the coiled spring 12.
  • the sewing needle 3 is a single component composed of a handle section 13, a joint section 14, a main section of needle 15, and a tip of needle 16.
  • a short tapered section 13a is formed at a root of the handle section 13
  • a depressed section (dent) 17 is formed near the root in the longitudinal direction of the needle
  • an eye of needle 3a is formed on the main section of needle 15 near a tip of needle 16.
  • the depressed section 17 formed on the side of handle 13 has a triangularly pyramidal concave shape in the lateral direction and can be freely inserted by the action apex 10a in the sewing needle 3.
  • Yet a generic name of both main section of needle 15 and tip of needle 16 is defined as a needle section 15.
  • the knob 11 is a coin-shaped component, which has a circular hole 11 a at a center in order to push the end 10b of the piston 10 has a roulette-fabricated surface 11b on the circumference to effectively prevent slipping, and is chamfered at both sides.
  • the coiled spring 12 and the piston 10 are pushed in this order into the lateral hole 9 against the base end 10b stuck out from the protrusion 6B.
  • Mounting and exchange of the needle 3 is operated as follows. That is, the sewing needle 3 is inserted from a lower end of the rod body 6A into the mounting hole 8, the knob 11 is pulled back against a force associated with the coiled spring 12, and the handle 13 is pushed into the hole until exceeding a position of the action apex 10a. In this position, a pull back operation of the knob is released, the sewing needle 3 moves up and down as well as rotates clockwise and counterclockwise to search a position, where the action apex 10a of the piston 10 associated with the protrusion snugly fits into the depressed section, 17 of the sewing needle 3 (see Figure 3), completing the mounting operation of the sewing needle 3 onto the needle stopper 6.
  • the knob 11 is first pulled back to get the action apex 10a of the piston 10 out of the depressed section 17 of the sewing needle 3 and then the sewing needle 3 is lowered to pull out from the mounting hole 8, completing a pullout of the needle from the needle stopper 6.
  • the action apex 10a associated with the protrusion is fitted into the depressed section 17 to determine a position for both vertical and rotational directions of the sewing needle 3, thus yielding a convenience of eliminating an operation to match a direction of an eye of needle 3a as well as an advantage of determining the vertical position of the sewing needle 3, which is still able to escape upward.
  • the sewing needle 3 is raised to a position separated by a distance, H from a normal position. Therefore, when a large upward force is exerted onto the sewing needle 3, the needle automatically shifts to the loose fitting hole 8a or the loose fitting opening 7a, yielding a benefit to avoid breakage of the sewing needle 3.
  • a threshold limit of an upward force to shift the sewing needle 3 for relief can be readily changed and adjusted by varying a force associated with the coiled spring 12 in the protrusion of the piston 10.
  • initial condition for relief shift can be freely set by changing a tapered angle of the locking section between the action apex 10a and the depressed section 17 or an inserted depth by the sewing needle 3.
  • a sewing needle 3 of number 10 can be mounted on a support rod 7 together with a needle stopper 6 with a dedicated coiled spring 12 as a set, whereas a sewing needle 3 of number 9 is mounted on a support rod 7 together with a needle stopper 6 with another dedicated coiled spring 12 as another set.
  • the alumite treated needle stopper 6 conveniently differs each other with a color for the sewing needle of number 10 and that of number 9.
  • a protrusion of an action apex 10a may have a domed shape and a depressed section 17 has a matching domed dent.
  • An action apex, 10a with a triangular pyramidal or spherical structure has such advantage that the action apex can shift a sewing needle in a rotational direction upon exertion of an excessive force in not only vertical direction but also rotational direction. If only a vertical relief shift of the needle is preferable, it is possible to have an action apex 10a, which is triangular in a side view and tilted only in the vertical direction and rectangular in a plane view. As described above, various variations in the needle locking mechanism B is possible.
  • a needle stopper 24 in this embodiment has a lateral opening 23, into which a contact component 20 is inserted to lock a sewing needle 25.
  • Said contact component 20 comprises a component 22 to tightly cover a side of the needle stopper 24 and a component 21 to contact and lock the sewing needle 25.
  • the sewing needle 25 is the same as one 3 in said embodiment and similarly has a depressed section 26.
  • Said component 22 is prepared with an elastically deformable material and has a roughly cylindrical shape with an inner diameter smaller than an outer diameter of the needle stopper 24, while a part of the cylinder is chipped away.
  • This removable component tightly covers the needle stopper 24 by its elasticity.
  • This structure allows a component 21 to contact and lock the sewing needle 25 by elasticity. If a force by some reason is strongly exerted onto the sewing needle 25 to push up, the component 21 is forced to push outward against a force associated with the component 22, which is deformed, enabling the sewing needle 25 to shift upward.
  • a contact surface of the component 21 and a depressed section of the sewing needle 25 can be modified in various geometries similarly to said embodiment.
  • a needle stopper 34 in this embodiment has a groove 33 to clip a sewing needle, 35 with the clip-shaped contact component 30 to lock.
  • Said contact component 30 comprises a component 31 to contact an outside of the needle stopper 34 and a component 32 to contact a sewing needle 35 to lock.
  • the sewing needle 35 has a groove 36 instead of a depressed section in other embodiment.
  • Said contact component 30 has a shape to clip both needle stopper 34 and sewing needle 35 to lock.
  • the component 31 holds down an outside of the needle stopper 34, whereas the component 32 fits into the groove 36 of the sewing needle 35 to hold down.
  • an elastic force by the clip-shaped component clips both needle stopper 34 and sewing needle 35 to lock.
  • the component 32 is pushed to an outside of the groove 33 of the needle stopper 34, enabling the sewing needle 35 to shift upward. Accordingly, the groove 33 instead of a lateral opening is formed in the needle stopper 34 in order to enable the component 32 to move freely.
  • Figure 10 shows a side-by-side alignment of two needle locking mechanisms B.
  • Use of two needle locking mechanisms B enables a flexible response to a change of a sewing force.
  • An example shown in Figure 10 uses a vertical alignment of the needle locking mechanism, but perpendicular alignment as well as a combination of other needle locking mechanisms can be used.
  • Figure 11 shows an operation to put a silicone O-ring 41 on a sewing needle 40 to prevent surpassing the hole of a needle holding section, while a position has to be determined to match with a lateral opening of a needle stopper as a sewing needle is inserted into a mounting opening of a needle stopper.
  • a working bench for its installation is shown in bench 42.
  • the working bench 42 has a rut 45 to fit the O-ring 41 and a cavity 43 to insert a sewing needle 40.
  • a depth X of the cavity for insertion 43 is the same as the distance X from a tip of the sewing needle 40 to an installing position of the O-ring 41. This setup enables the O-ring 41 to place in the same position every time.
  • a method to use the working bench 42 first involves placement of the O-ring 41 onto the rut 45 on the working bench 42.
  • the sewing needle 40 is next inserted deep into the cavity for insertion 43.
  • the sewing needle 40 is then pulled out to complete mounting of the O-ring 41 at a desired position.
  • a mounting opening of a needle stopper for a sewing needle is extended to enable an upward relief shift of the needle and the sewing needle is elastically pushed to lock.
  • the sewing needle moves together with the needle stopper, resulting in a good sewing operation.
  • the needle locking mechanism is kicked in to shift the sewing needle upward against a force associated with an elastic component, preventing the sewing needle from exertion of an unusual force and avoiding to bend or break the needle.
  • the present invention provides a means to prevent breakage of the sewing needle itself rather than a way to handle the broken needle so that scattering of the needle after breakage can be avoided as well as a tedious work for collection of all of its fragments to consume a lot of hours can be relieved, substantially reducing a shutdown time of a production line.
  • modification of the needle locking mechanism with both needle stopper and sewing needle can avoid breakage of the sewing needle in spite of a relatively simple modification. A rational and practical benefit with improving production efficiency is thus provided.
  • the present invention provides a sewing needle mounting structure, in which a conically pointed section of a contact component fits with a depressed section formed on a side of the sewing needle so that this needle locking mechanism can determine a position of the sewing needle in the rotational direction in addition to the vertical direction.
  • a composition for prevention of the sewing needle from breakage is utilized to meet a needed function for determining a position of the sewing needle in the rotational direction, enabling its mounting operation rational and easy.
  • the present invention as a sewing needle provides a sewing needle suitable for the sewing machine mounting structure according to Claim 1. That is, a sewing needle composed of sections of a large diameter handle, a needle, and a joint between the needle and handle has a depressed section in the handle such that a contact component fits into the depressed section to determine a position of the needle against a needle stopper, when the needle is mounted on the sewing stopper. Therefore, simple modification, in which a depressed section is formed on the handle, can provide a desirable sewing needle to avoid possible breakage.
  • a sewing needle or its mounting structure has a structure, in which a depressed section formed on the sewing needle has a conically concave geometry to control movement of the sewing needle not only in the vertical direction but also in the rotational direction, when a contact component fits into said depressed section. Therefore, when the sewing needle is inserted into a mounting hole of a needle stopper, a position in both vertical and rotational directions is conveniently determined so far as the contact component fits into the depressed section. Determination of a position in the rotational direction provides a benefit to readily set up an eye of needle in normal direction.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP04746463A 2003-07-01 2004-06-25 Sewing needle mounting structure and sewing needle Withdrawn EP1645673A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003189535A JP4079224B2 (ja) 2003-07-01 2003-07-01 ミシン針取付構造
PCT/JP2004/008994 WO2005003425A1 (ja) 2003-07-01 2004-06-25 ミシン針取付構造及びミシン針

Publications (1)

Publication Number Publication Date
EP1645673A1 true EP1645673A1 (en) 2006-04-12

Family

ID=33562296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04746463A Withdrawn EP1645673A1 (en) 2003-07-01 2004-06-25 Sewing needle mounting structure and sewing needle

Country Status (6)

Country Link
EP (1) EP1645673A1 (ja)
JP (1) JP4079224B2 (ja)
KR (1) KR20060025579A (ja)
CN (1) CN1813090A (ja)
TW (1) TW200506128A (ja)
WO (1) WO2005003425A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103361911A (zh) * 2013-07-30 2013-10-23 苏州巨康缝制机器人有限公司 一种缝针
CN108035080B (zh) * 2018-01-11 2020-02-18 朱繁荣 一种缝纫机气缸针座
CN108442053B (zh) * 2018-06-07 2020-03-27 浙江骏马衣车股份有限公司 一种童装缝纫专用针
CN108642737A (zh) * 2018-07-11 2018-10-12 吴江市震宇缝制设备有限公司 一种缝纫机用缝纫针固定装置
CN109183284A (zh) * 2018-09-12 2019-01-11 天津腾达集团有限公司 一种劳保鞋缝制机
CN113260751A (zh) * 2018-12-28 2021-08-13 本田技研工业株式会社 缝纫针保持装置
JP7328686B2 (ja) * 2019-10-09 2023-08-17 クロバー株式会社 手芸針

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS436027Y1 (ja) * 1965-09-08 1968-03-16
US3581689A (en) * 1968-12-20 1971-06-01 Felix J Berube Sewing machine construction
JPS5334462U (ja) * 1976-08-26 1978-03-25
JPS5946992A (ja) * 1982-09-08 1984-03-16 ヤマトミシン製造株式会社 オ−バ−ロツクミシンの地縫と裾引縫との相互転換方法並びに其の装置
JP3829472B2 (ja) * 1998-04-27 2006-10-04 ブラザー工業株式会社 ミシンの縫針保持装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005003425A1 *

Also Published As

Publication number Publication date
TW200506128A (en) 2005-02-16
WO2005003425A1 (ja) 2005-01-13
JP2005021337A (ja) 2005-01-27
JP4079224B2 (ja) 2008-04-23
KR20060025579A (ko) 2006-03-21
CN1813090A (zh) 2006-08-02

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