JPH022292Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a thread tension pressure release device for sewing machines, and is used when threading the sewing machine during sewing work, when threading the upper thread, etc. It is suitable as a device for

(Prior Art) Conventionally, a technique disclosed in Japanese Utility Model Publication No. 55-34935 is known as a device of this type.

In this technology, the release of the thread tension pressure when the presser foot is raised (manual operation) and the release of the thread tension pressure at the lower position of the presser foot (automatic operation using a solenoid during automatic thread trimming, etc.) are carried out in one common device. This is done through the actuating body.

(Problem to be solved by the invention) In the conventional device described above, when attempting to manually release the thread tension pressure in order to perform the work of letting out the upper thread at the beginning or end of sewing, the presser foot rises in conjunction with the release of the thread tension pressure. As a result, the presser foot attached to the presser bar rises to the vicinity of the needle threading hole (second
(see figure), there was an inconvenient problem that interfered with threading the needle into the needle.

The present invention aims to solve these problems.

[Structure of the idea]

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention eliminates the interlocking mechanism between the presser bar and the thread tension pressure release device.

An electromagnet is provided near the thread tension device, and the movement of the armature of the electromagnet and the operation of the countersunk pin of the thread tension device are linked via an operating body.
Furthermore, the front end face of the armature was exposed on the front surface of the sewing machine frame.

(Function) When the armature moves forward due to the energization of the solenoid, one end of the actuating body arranged in a double take-up manner is pressed, and the other end presses the countersunk pin of the thread tension. Therefore, a gap is created between the pair of thread tension discs for the thread to pass through. Regarding the generation of this gap, the same effect can be obtained by manually pressing the end face of the armature exposed at the front of the sewing machine frame, instead of using the electromagnetic method. Thereby, even when the presser foot is in the lower position, the needle thread tension can be released by releasing the thread tension pressure.

(Embodiment) In FIG. 1, 1 is a sewing machine frame, 2 is a mounting plate fixed to the sewing machine frame 1, 3 is a thread tension regulator provided on the mounting plate, 4 is a countersunk pin, and 5 is a mounting plate fixed to the sewing machine frame 1. A pair of thread tension discs.

6 is a direct-acting solenoid, and (7) is an armature, the end face 7a of which is exposed outward in the front direction of the arm machine frame.

Reference numeral 8 denotes an operating body, which is supported in the middle by a screw member 9, and has one end in contact with the armature end 7b and the other end in contact with the countersunk pin 4.

A description of the operation of the device in this embodiment (release of thread tension pressure) will be omitted since it will be obvious by referring to the operation section.

[Effect of idea]

In order to solve the problems in the prior art, similar to the present invention, the link between the lifting of the presser bar and the thread tension pressure release device is abolished, and a manually operated push button is provided near the thread tension device, and by operating this button, the thread tension pressure can be reduced. It is also conceivable to be able to release the needle thread and pass it through the needle hole without being hindered by the presser foot.

However, this method requires a pushbutton and associated component devices in addition to the electromagnet, and is associated with a number of disadvantageous problems.

In this invention, an electromagnet is installed near the thread tension device, and the other end of the armature is exposed toward the operator from the outside of the sewing machine frame in order to enable manual operation.
As a dual-purpose type that satisfies both automatic and manual functions, thread tension pressure can be released, and needle thread tension can be released by releasing thread tension pressure even when the presser foot is in the lower position. As a result, the presser foot does not get in the way during the needle thread feeding operation at the beginning and end of sewing, and work efficiency can be improved.

Moreover, it is advantageous because it does not require the addition of many parts and the configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 is an explanatory plan view of the structure of the device of the present invention, and FIG. 2 is an explanatory diagram of the problems with the conventional device. 1... Sewing machine frame, 2... Mounting plate, 3... Thread tension device, 4... Disc press pin, 5... Thread tension disc, 6...
... Solenoid, 7... Armature, 8... Operating body.

Claims (1)

[Scope of utility model registration request] A thread tension device that adjusts the needle thread tension by pinching the needle thread; and a thread tension device that is connected to the thread tension device through an actuating body and operates in conjunction with the upward movement of the presser foot by electric control to operate the thread tension device. A thread tension pressure release device for a sewing machine has an electromagnet that automatically releases upper thread tension by pressing the other end of the armature of the electromagnet, one end of which is linked to the thread tension device via the operating body. A sewing machine thread tension pressure release device exposed on the operator side from the outside of the frame.