Sewing machine including needle bar turning apparatus

Patent metadata

Field	Value
Publication number	US-2016348290-A1
Application number	US-201615138275-A
Country	US
Kind code	A1
Filing date	Apr 26, 2016
Priority date	May 25, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

A sewing machine includes a needle bar turning apparatus. The apparatus includes: a needle bar holder swingably held with a fulcrum point as the center of rotation; a swing rod connected to the needle bar holder to transmit a driving force that swings the needle bar holder; a needle bar held by the needle bar holder, which is slidable along the axis and turnable with the axis as the center of rotation, and swingable together with the needle bar holder; a coupling member fixed to the needle bar such that it extends in a direction orthogonal to the needle bar; a guide shaft that extends along the needle bar; and a guide shaft connecting bracket fitted to the coupling member and the guide shaft such that it is movable relative to the coupling member in the coupling member extending direction, and turnable relative to the coupling member with a vertical line extending in the extending direction as the center of rotation.

First claim

What is claimed is:

1 . A sewing machine comprising a needle bar turning apparatus, wherein the needle bar turning apparatus comprises:
a needle bar holder held such that it can be swung along a conical plane with a fulcrum point provided to a sewing machine main body as a center of rotation; a swing rod that is connected to the needle bar holder, and that transmits a driving force so as to swing the needle bar holder; a needle bar that is configured as a bar-shaped member, that is held by the needle bar holder such that it can slide along an axis of the bar-shaped member and such that it can turn with the aforementioned axis as a center of rotation, and such that it can be swung together with the needle bar holder; a guide shaft arranged such that it extends along the needle bar; and a needle bar turning portion that is arranged such that one end thereof is fixed to the needle bar and the other end thereof can be turned with the guide shaft as a center of rotation, and that turns the needle bar with the aforementioned axis as a center of rotation according to swinging of the needle bar holder.

2 . A sewing machine comprising a needle bar turning apparatus, wherein the needle bar turning apparatus comprises:
a needle bar holder held such that it can be swung, with a fulcrum point provided to a main body of the sewing machine as a center of rotation; a swing rod that is connected to the needle bar holder, and that transmits a driving force that swings the needle bar holder; a needle bar held by the needle bar holder such that it can be slid in an axial direction thereof and such that it can be turned with an axis thereof as a center of rotation, and configured to be swung together with the needle bar holder; a coupling member that is fixed to the needle bar, and that is arranged such that it extends in a direction that is orthogonal to the needle bar; a guide shaft arranged such that it extends along the needle bar; and a guide shaft connecting bracket fitted to the coupling member and the guide shaft such that it can be moved relative to the coupling member in a direction in which the coupling member extends, and such that it can be turned relative to the coupling member with a virtual line that extends in the extension direction as a center of rotation.

3 . The sewing machine comprising the needle bar turning apparatus according to claim 2 , wherein the needle bar holder is configured such that position adjustment can be made for the fulcrum point in a direction in which the swinging central axis extends,
and wherein a margin is provided to a fitting portion that connects the coupling member and the guide shaft connecting bracket so as to absorb an angle of tilting that occurs between the guide shaft and the needle bar due to the position adjustment of the fulcrum point.

4 . The sewing machine comprising the needle bar turning apparatus according to claim 2 , comprising a needle bar connecting bracket that is engaged with a crank rod that transmits a driving force that drives the needle bar in the axial direction,
wherein the needle bar connecting bracket is arranged such that it is engaged with the coupling member, wherein a margin is provided to a gap between the needle bar connecting bracket and the needle bar so as to absorb a tilting of the needle bar, and wherein the needle bar connecting bracket and the coupling member are configured such that they do not interfere with each other due to swinging of the coupling member with the guide shaft as a center of rotation.

5 . A sewing machine comprising a needle bar turning apparatus, wherein the needle bar turning apparatus comprises:
a needle bar holder held such that it can be swung with a fulcrum point provided to a sewing machine main body as a center of rotation; a swing rod that is connected to the needle bar holder, and that transmits a driving force so as to swing the needle bar holder; a needle bar that is configured as a bar-shaped member, that is held by the needle bar holder such that it can slide along an axis of the bar-shaped member and such that it can turn with the aforementioned axis as a center of rotation, and that can be swung together with the needle bar holder; a crank rod that transmits a driving force so as to drive the needle bar in the axial direction; a needle bar connecting bracket that is engaged with the crank rod; a needle bar coupling portion that is fixed to the needle bar, that is coupled with the needle bar connecting bracket in a state that allows the needle bar coupling portion and the needle bar to turn with the axis of the needle bar as a center of rotation, and that receives the driving force from the needle bar connecting bracket so as to drive the needle bar in the axial direction; a guide shaft arranged such that it extends along the needle bar; and a needle bar guide portion comprising a fixing portion fixed to the needle bar, and a coupling portion coupled with the guide shaft such that it can be turned with the guide shaft as a center of rotation with a degree of freedom that allows it to relatively tilt with respect to the guide shaft.

6 . The sewing machine comprising the needle bar turning apparatus according to claim 5 , wherein the coupling portion of the needle bar guide portion comprises a protruding portion having a semicircular cross-sectional shape, which is coupled with the guide shaft.

7 . The sewing machine comprising the needle bar turning apparatus according to claim 5 , wherein the needle bar coupling portion includes at least a portion having a spherical structure,
and wherein the needle bar connecting bracket is coupled with the spherical structure of the needle bar coupling portion.

8 . The sewing machine comprising the needle bar turning apparatus according to claim 5 , wherein the needle bar coupling portion is configured as a combination of two ring-shaped members each of which allows the needle bar to be inserted,
and wherein the needle bar connecting bracket is arranged between the two ring-shaped members, so as to be engaged with each of the two ring-shaped members.

9 . The sewing machine comprising the needle bar turning apparatus according to claim 3 , comprising a needle bar connecting bracket that is engaged with a crank rod that transmits a driving force that drives the needle bar in the axial direction,
wherein the needle bar connecting bracket is arranged such that it is engaged with the coupling member, wherein a margin is provided to a gap between the needle bar connecting bracket and the needle bar so as to absorb a tilting of the needle bar, and wherein the needle bar connecting bracket and the coupling member are configured such that they do not interfere with each other due to swinging of the coupling member with the guide shaft as a center of rotation.

10 . The sewing machine comprising the needle bar turning apparatus according to claim 6 , wherein the needle bar coupling portion includes at least a portion having a spherical structure,
and wherein the needle bar connecting bracket is coupled with the spherical structure of the needle bar coupling portion.

11 . The sewing machine comprising the needle bar turning apparatus according to claim 6 , wherein the needle bar coupling portion is configured as a combination of two ring-shaped members each of which allows the needle bar to be inserted,
and wherein the needle bar connecting bracket is arranged between the two ring-shaped members, so as to be engaged with each of the two ring-shaped members.

Assignees

• Janome Sewing Machine Co Ltd

Inventors

• Nakajima Makoto
• Koike Mikio
• Noji Yu

Classifications

• D05B3/02 Primary

  with mechanisms for needle-bar movement · CPC title

• D05B55/14

  Needle-bar drives · CPC title