JPH0314145Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a sewing machine equipped with a thread take-up spring that absorbs slack in thread that occurs when forming seams.

Prior Art When forming a seam, the amount of thread required for the needle thread loop captured by the tip of the needle to pass through the hook is supplied exclusively by the descent of the thread take-up, and after passing through the hook, the amount of thread required to pass through the hook is supplied as the needle thread loop rises. However, the lifting of the thread take-up alone is insufficient to absorb the slack in the needle thread loop that has passed through the hook, and sewing machines usually have a thread take-up spring to absorb the slack in the thread. provided. The thread take-up spring may be installed independently or attached to the dial tension device, but in either case it is located below the front of the head, and the thread fed out from the bobbin winder is guided down the front of the head through a guide, and the thread take-up spring After the thread is hung on the needle, it is pulled up and threaded through the eye of the thread take-up, and then lowered down and threaded through the eye of the needle. .

Problems that the invention aims to solve As mentioned above, the conventional thread take-up spring is installed below the thread take-up thread so that the thread take-up and thread take-up functions can be fully performed by the thread thread thread take-up spring, and the thread path between the thread take-up spring and the needle tip is long. Therefore, it takes time for the thread absorption effect of the thread take-up spring to be transmitted to the needle thread loop, which tends to slow down the reaction.Also, with threads that have a large degree of elasticity, the amount of thread absorption by the thread take-up spring is compensated for by the elongation of the thread. Absorption of slack in the needle thread loop tends to be incomplete.

Means for Solving the Problem In order to solve the above problem, the present invention is characterized in that a thread take-up spring is provided on the thread path between the thread take-up lever and the needle, and the thread path from the thread take-up spring to the needle tip is made shorter. be.

Here, the thread take-up spring may have its engaging portion for the thread provided on the side of the guide on the side of the thread take-up or on the side of the line connecting the thread take-up and the needle, but is preferably provided on the above-mentioned line. .

The thread take-up spring may also be of the conventional type and placed between the conventional thread take-up and the needle or very close to the thread take-up, but it is preferable to use a thread take-up spring that can be used to thread the thread simply by pointing it toward the needle and lowering it downwards. Moreover, this is based on the sewing machine balance device previously proposed by the present applicant in Japanese Patent Application No. 1983, which consists of guides arranged above and below and a balance that reciprocates laterally between the guides. During the forward movement, the thread is captured and pulled between both guides to pull out the thread from the bobbin spool, pull up the upper thread loop, and tighten the thread, while during the return movement, the thread is released from pulling on the thread and passes through the hook. It is desirable to combine it with a thread take-up device that compensates for the required amount of thread. Thread thread take-up and thread take-up spring can be threaded by simply lowering the thread downward.

Embodiment A thread take-up spring 22 extending from the coil portion 20 is arranged parallel to the thread path from the thread take-up to the needle, and is provided with a thread engaging portion at the tip that extends to the thread path and engages with the thread 21. The force is applied in the clockwise direction in the figure with the center at the center. 23 is a stopper pin that regulates the amount of rotation of the thread take-up spring.

According to this embodiment, in the process in which the needle thread loop is pulled up by the thread take-up and the thread is pulled out from the bobbin winder, the thread take-up spring 22 is bent to the imaginary line position in the figure due to the tension of the thread, but the needle thread loop is When the thread passes through the hook and becomes slack, it moves to the solid line position in the figure and absorbs the slack.

In this embodiment, the thread take-up spring is provided parallel to the thread path, but it may be arranged perpendicular to the thread path.

Effects of the invention As described above, the sewing machine of this invention has a thread take-up spring placed on the thread path between the thread take-up lever and the needle, and the path from the thread take-up spring to the needle tip is shorter than that of conventional machines. As a result, the slack in the needle thread loop is quickly absorbed by the thread absorption action of the thread take-up spring, and the amount of elongation is small even with highly elastic thread, so the absorption of slack in the needle thread loop is relatively fast. It is often done.

[Brief explanation of drawings]

The figure shows a schematic diagram of the thread take-up spring. 20... Coil portion, 21... Thread, 22... Thread take-up spring, 23... Stopper pin.

Claims (1)

[Scope of utility model registration request] This sewing machine is equipped with a thread take-up spring that absorbs slack in the thread on the thread path between the needle and the thread take-up lever, which moves reciprocally in conjunction with the upper shaft to tighten and loosen the thread necessary for stitch formation.