JPH0630706B2 - Sewing machine balance device - Google Patents

Description

Description: TECHNICAL FIELD The present invention has a balance that reciprocates in conjunction with an upper shaft and guides arranged on both sides of the balance, and a thread between the guides when the balance moves forward and backward. The present invention relates to a balance device for a sewing machine that engages and pulls and pulls the yarn, and when the yarn is returning, the pulling on the yarn is released to return.

As is generally well known, the balance moves up and down in the slit formed in the frame with the upper shaft in a state where the upper thread is passed through the eye hole, and tightens and loosens the thread necessary for seam formation. Threading through the eyelet is usually performed by pulling up the upper thread that has been passed through the thread tension regulator when the balance is near top dead center, and then pulling it downward after threading. It is subjected to conversion to, and adapted to be threaded through the prospect of the needle.

Problems to be Solved by the Invention As described above, the conventional balance requires threading work into the eyelet, and the thread must be turned downward after threading.

It is also desired that the yarn fed from the spool to the needle has its path as short as possible. This is because a yarn having a high degree of expansion and contraction causes a large amount of expansion and contraction, which adversely affects sewing.

Therefore, the present invention makes it possible to reach the needle without threading the eye by simply lowering the thread in the vertical plane, thereby facilitating the threading operation and reaching the needle. The purpose is to make the thread path as short as possible.

Means for Solving the Problems In order to achieve the above object, the present invention provides a needle or a thread insertion port for a thread insertion hole formed in both guides which are vertically arranged with appropriate gaps. The balance is arranged in a vertical plane that passes nearby, and the balance is configured to reciprocate horizontally between both guides, and when the balance moves forward, it engages with the yarn between both guides to capture and pull the yarn. On the other hand, during the backward movement, the traction of the yarn is released and the yarn is returned.

The guide has, for example, a slit-shaped thread insertion groove through which the thread is passed, and the groove is inclined with respect to the vertical plane or provided on the vertical plane.

The balance performs a reciprocating linear motion or a rocking motion. The latter swinging motion may be a swinging motion in a horizontal plane or a swinging motion in a vertical plane.

Since this device does not need to be threaded through the balance, it can be completely incorporated in the frame so that the balance does not protrude from the frame. In this case, the frame on the vertical surface is formed with slits that also serve as thread insertion ports for the guides, and each guide is provided corresponding to the slits so that the thread can pass through the guides through the slits.

A thread tension device is provided near the device, and it is desirable that the tension device is arranged at a position such that a pair of tension discs sandwich the vertical plane. This is because the thread can be threaded through the thread tensioner by operating in the vertical plane, the work is easier, and the thread path can be further shortened.

Example A slit 3 is formed on a vertical plane passing through a needle 2 on a top plate and a front surface of a frame 1, and a bracket 4 is formed in the frame.
The bracket 4 is provided with a slot 5 orthogonal to the slit 3, a rod 6 is attached in parallel to the slot 5, and guides 7 are formed above and below the slot 5. And each guide 7 is a bracket 4
Has a width corresponding to the gap between the frame 1 and the frame 1, contacts the frame, and has an insertion groove 8 at a position corresponding to the slit 3. A balance 9 is slidably attached to the rod 6, and the balance 9 is connected via a link 12 to a lever 12 that swings in conjunction with an upper shaft 11, and the lever 1
It is configured to reciprocate along the rod 6 by the swing of 2. The tip of the rod is formed in a hook shape and protrudes from the slot 5, and engages with the thread between both guides when the balance moves forward, It is designed to catch and pull the thread. When returning, the traction on the yarn is released, and the yarn is slackened accordingly. The bracket 4 is also provided with a thread tensioner, although only the tension tray 15 is shown in the figure, and the tension tray 15 is located under the slit formed in the top plate as shown in the drawing, and the thread inserted in the slit 3 is inserted. So that it can be passed between the tones.

FIG. 3 shows another mode of the balance. One end formed in a hook shape is projected from the slot 5 of the bracket 4, and the other end is rotatably attached to the sewing machine body. At its intermediate portion, it is connected to a lever 18 by a link 19, and the lever 18 is swung by an end face cam 20 fixed to the upper shaft 11 so that the hook portion at the tip of the balance lever 17 moves in an arc.

EFFECT OF THE INVENTION According to the balance device of the present invention, when threading, it is only necessary to operate the thread downward in the vertical plane until it reaches the needle, and there is no need to thread the thread to the balance or change the direction of the thread. The threading operation is facilitated, the path of the thread to the needle is shortened, the expansion and contraction of the thread is reduced, and the influence on the sewing is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a balance device according to the present invention, FIG. 2 is a plan view of the balance device, and FIG. 3 is a plan view of another embodiment. 1 ... Frame, 2 ... Needle 3 ... Slit, 4 ... Bracket 5 ... Slot, 6 ... Rod 7 ... Guide, 9 ... Balance 15 ... Condition plate, 17 ... Balance lever

Claims (3)

[Claims] 1. A thread insertion port for inserting a thread into an eyelet formed in both guides which are vertically arranged at appropriate intervals, is arranged on a needle or a vertical plane passing near the needle, and the balance is arranged on both sides. It is configured to horizontally reciprocate across the guides, and when the balance moves forward, it engages with the yarn between both guides to capture and pull the yarn,
A balance device of the sewing machine that releases the traction of the thread when returning to the original position. 2. The balance device for a sewing machine according to claim 1, wherein the thread tension device is arranged so that the vertical plane passes between the tension plates. 3. The balance device for a sewing machine according to claim 1, wherein a slit is formed on the vertical surface, the slit passing through both guides on the frame.