JPH0718384Y2 - Sewing machine threading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a thread hooking device for a sewing machine.

[Prior Art] When the upper thread fed from the thread sesame is hung on the thread guide shown in FIG. 3, both ends of the thread are grasped by both hands to give a certain amount of tension, The thread was passed from above the thread guide between the tension base and the tension tray.

In this case, the thread is gripped by the tension base and the tension tray pressed by the spring, and the thread is prevented from coming off by the retainer.

[Problems of the prior art] In the prior art, since the upper thread fed from the thread sesame has no tension at all, both ends of the thread must be grasped by both hands to give tension to the thread and hang it on the thread guide. The thread hooking work was not easy.

[Means for Solving the Problem] By rotating the presser foot raising lever, the upper thread fed from the thread sesame has a certain tension so that the thread can be hung on the thread guide with one hand.

[Operation] When the presser foot raising rotation lever is rotated, the transmission member that transmits the movement to the link rod moves, and the link rod operates so that the pressing piece at one end comes into contact with the outer peripheral portion of the thread sesame. As a result, tension is applied to the upper thread fed from the thread sesame.

[Embodiment of the Invention] A frame cover 2 is provided on an upper portion of a sewing machine 1 shown in FIG. 1, and a thread sesame 4 is horizontally installed in a recessed portion at the right end of the frame cover 2 and an upper portion 14 fed out therefrom is provided. Before carrying out the sewing work, the sewing work is carried out by passing it through the thread guide 15 or the like.

FIG. 2 shows a detailed portion of the present invention, in which the eccentric cam 10 which rotates counterclockwise by the operation of the presser foot raising lever 16 and the tip which similarly rotates counterclockwise with it. Spring end 11A, pressing piece 12 and spring 13
A thread hooking device including a link rod 11 having a.

Next, the operation will be described.

When the presser foot raising lever 16 is rotated, the eccentric cam 10 rotates in the direction of the arrow, and accordingly, the link rod 11 also rotates in the same direction, and the spring end 11A at the tip thereof pushes the spring 13 and pushes it against the spring 13. The pressed pressing piece 12 contacts the outer circumference 3 of the thread sesame 4. Therefore, the upper thread 14 is tensioned at this contact point, and a tension is generated in the upper thread 14.

When the presser foot lifting lever 16 is operated in this way, the needle thread
Moderate tension is generated in 14.

Further, this invention cannot be used unless the presser foot raising lever 16 is rotated. Therefore, in order to ensure the utilization of this invention, in combination with the threading mistake prevention device disclosed in Japanese Patent Application No. 1-337919. You may use it.

The yarn hooking error prevention device disclosed in Japanese Patent Application No. 1-37919 is
The structure is as shown in FIG.

When the presser foot raising lever 16 is rotated to move the operation member 31 in the direction of arrow A, the moving plate 20 and the swing plate 22 move in the direction of arrow, and the auxiliary roller 19 and the driven roller 18 located thereabove are the feeding rollers. At the same time, the thread hooking prevention plate 40 is rotated in the direction of the arrow away from the thread hook 17 and separated from the thread hooking guide 21 to be in the thread hookable state.

As described above, when used in combination with the yarn hooking mistake prevention device disclosed in Japanese Patent Application No. 1-37919, the yarn hooking state cannot be obtained unless the presser foot raising lever 16 is rotated.
When trying to carry out thread hooking, the upper thread 14 is always in a tensioned state, and the thread hooking device of the present invention can be reliably used.

[Effects of the Invention] According to the present invention, when the thread is ready to be threaded, an appropriate tension is generated in the upper thread so that the thread can be threaded with one hand, which facilitates threading work.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention, FIG. 2 is a detailed view of an embodiment of the present invention, FIG. 3 is a detailed view of a yarn hooking thread guide device, and FIG. 4 is a perspective view of a yarn hooking prevention device. It is a figure. 1 ... Sewing machine, 2 ... Frame cover, 3 ... Thread sessile, 4 ... Thread sesame, 5 ... Tension base, 5A ...
Notch groove, 6 ... Tension pan, 6A ... Prevention of slippage, 7
…… Axis, 8 …… Tension spring, 9 …… Retaining ring, 10 ……
Eccentric cam, 11 …… Link rod, 11A …… Spring piece, 12 …… Pressing piece, 13 …… Spring, 14 …… Needle thread, 16 …… Pressing foot raising lever, 17 …… Feeding roller, 18 …… Following Roller, 19 ... Auxiliary roller, 20 ... Moving plate, 21 ... Thread hook thread guide, 22 ... Oscillating plate, 31 ... Operating member, 40 ... Thread hook error prevention plate.

Claims (1)

[Scope of utility model registration request] 1. A thread sesame arranged horizontally on a frame cover of a sewing machine, a transmission member for transmitting the movement to a link rod with the rotation of a presser foot lifting lever, and a movement of the transmission member. In a thread hooking device comprising a link rod whose one end pressing piece contacts the outer periphery of the thread sesame, by rotating a presser foot lifting lever, a tension is applied to the upper thread fed from the thread sesame. Sewing machine thread hooking device.