JPH0322312Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a method for sewing pile threads onto pile fabrics (base fabrics) such as carpets, mats, mokets, etc. using a flocked sewing machine. The present invention relates to an improvement of a flocked sewing machine that automatically cuts remaining pile threads that are locked.

[Conventional technology]

In conventional pile cut sewing using a flocked sewing machine, the method for cutting the pile thread at the end of sewing is as follows:
As disclosed in Utility Application No. 174783, etc.
When the needle bar, that is, the needle, stops at the top dead center, the upper shaft of the flocking sewing machine body is separated and only the lower shaft is driven.The cut knife mechanism attached to the interlocking looper removes the remaining pile yarn that is locked to the looper. It was disconnected.

Another method is to add another driving source such as an air cylinder or solenoid to the cutting knife attached to the looper at the end of sewing, and drive the cutting knife independently to remove the remaining pile yarn that is locked in the looper. Methods such as cutting the parts were adopted.

[Problem that the invention attempts to solve]

Conventional known techniques of this type all require modification of the flocked sewing machine itself or the addition of accessory parts, which weakens the inherent durability of the flocked sewing machine, and also increases the However, since they can cause malfunctions and are not easy to handle, they require greater care when used.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has been developed so that the flocked sewing machine body (hereinafter referred to as the sewing machine body) does not need to be modified or any other accessory equipment is installed, and the sewing machine body can be easily mounted on the sewing machine body. Two sets of needle position detectors are installed at the end of the shaft and linked to the needle position detector and thread trimming device, and one set of sensing devices is set at different angles, and a servo is used to drive the sewing machine body. By using a motor and adding an electric circuit to its attached control unit, it is possible to easily and easily remove the remaining pile yarn that is held in the looper at the end of sewing by simply stepping on the foot pedal. This makes it possible to cut continuously and sequentially.

[Effect]

The conventional thread trimming device, the operation of which will be explained based on the drawings, uses a light sensor 26 built into the needle position detector 16 and a needle position adjustment device 24 when the foot pedal 7 is returned to the center position after sewing is completed. The needle 11 is stopped at the bottom dead center by the operation of the optical sensor reflector 22 whose stop position is adjusted. Next, when the foot pedal 7 is reversely depressed, the thread trimming drive clutch is activated and at the same time the needle 11 is stopped at the bottom dead center. , the upper shaft 20 of the sewing machine makes half a rotation from the bottom dead center, stops at the top dead center, and performs thread trimming. The above driving is controlled by signals from the electric circuit of the control unit 4. , The above technology is a known technology.

The present invention utilizes conventional technology to attach a light sensor reflector 22 facing the light sensor 26 to the needle position detector 16, and further installs a light sensor 27 horizontally in parallel with the light sensor 26. A light sensor reflector 23 is disposed opposite to this and maintains an angle of 90° with the light sensor reflector 22, and
When the needle 11 is stopped at the top dead center at the end of sewing, and the foot pedal 7 is reversely depressed, the upper shaft 2 of the sewing machine
0 is a light sensor reflector 23 and a light sensor 27
The needle is rotated 90° 1/4 in reverse and forward direction by the detection of The remaining pile yarn 13 that has been removed is sequentially cut by an attached cutting knife 15.The desired purpose is achieved by driving the above-mentioned signal from an electric circuit built into a control unit 4 attached to a servo motor 3. be done.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

A sewing machine body 2 fixed to a sewing machine mounting base 1;
The servo motor 3 and the attached control section 4 are fixed to the bottom surface of the sewing machine mounting base 1.
is connected to a pulley 5 by a belt 6 to drive the sewing machine body 2, and a foot pedal 7 attached to the leg of the sewing machine mount 1 is connected to the control section 4 via a connecting rod 8. The sewing machine main body 2 is provided with a presser foot lifting device 10 and a thread lifting device 9. The above is a known matter.

A pulley 5 is fixed to the end of the sewing machine upper shaft 20 of the sewing machine main body 2 with a fixing screw 21, and a needle position detector 16 is attached to the pulley 5.

Fix the mounting plate 25 to the right side of the sewing machine body 2,
Optical sensors 26 and 27 are mounted horizontally in parallel on the mounting plate 25, and a reflective plate 22 for the optical sensor is mounted on the other pulley 5, and a reflective plate 22 for the optical sensor is held at an angle of 90° to the reflective plate for the optical sensor. The needle positioning adjustment device 24 provided with the light sensor 2
6 and 27, the stopping position of the needle 11 is adjusted so as to stop at the top dead center, and the needle 11 is fixed to the pulley 5.

Conventionally, by moving the foot pedal 7 to the center position after sewing is completed, the needle 11 is stopped at the bottom dead center by the operation of the light sensor 26 and the reflector 22 for the light sensor, and then the foot pedal 7 is moved in the opposite direction. By stepping on the pedal, the upper shaft 20 of the sewing machine is rotated by a half rotation by a reflector for a light sensor (not shown), and at the same time, a clutch (not shown) for driving thread trimming of the pile thread 13 is driven to move the needle 11 to the top dead center. The last pile yarn 13 is cut at the same time as the looper 14 moves, and the remaining pile yarn 13 retained by the looper 14 is cut by operating another mechanism.The above is a known technique.

In the present invention, at the end of sewing, when the foot pedal 7 is returned to the center position, the needle 11 is stopped at the top dead center by the operation of the optical sensor 26 and the optical sensor reflector 22, and then the presser foot lifting device 10 and operate the thread rolling device 9.

Next, when the foot pedal 7 is depressed in the opposite direction, the light sensor 27 and light sensor reflector 23 are activated, and the needle 1
1, by driving the servo motor 3 from the top dead center, the upper shaft 20 of the sewing machine is rotated 90 degrees 1/4 in the reverse direction, and is driven 3 to 4 times more than the clutch of the interlocking thread trimming mechanism is activated. As a result of continuous operation, the upper shaft of the sewing machine repeats forward and reverse rotation, and the remaining pile yarn 13 retained by the looper 14 is sequentially cut by the cutting knife 15 attached to the looper 14.

The above-mentioned operation only requires additional wiring of the electric circuit of the control section 4 attached to the servo motor 3. Adopting known technology, it can be easily expanded and wired without requiring any special configuration.

[Effect of idea]

As mentioned above, the present invention provides a method for cutting the remaining pile threads that are caught in the looper at the end of sewing when sewing pile threads using a flocking sewing machine.
There is no need to modify the flocking sewing machine itself, and
There is no need to attach additional accessories to the cutting knife, and an additional set of detection devices can be attached to the conventionally used needle position detector to detect the needle stop position at the end of sewing. This can be easily adjusted by simply moving the bottom dead center to the top dead center using the needle position adjustment mechanism.

For the electrical system, simply add an electric circuit from the needle position detector to the control unit attached to the servo motor and a 90° 1/4 forward/reverse limited circuit for the servo motor, and the remaining pile yarns held in the looper can be sequentially removed. Automatic and easy disconnection makes it easy to add electrical circuits using known techniques.

By providing this invention, it is completely unnecessary to modify the main body of the flocked sewing machine, and there is no need to install additional attached devices, so maintenance and management of the durability of the flocked sewing machine becomes easy, and additional equipment is no longer necessary. Since the sewing machine is also removed, it can be handled using the original method of using the sewing machine, which prevents malfunctions and improves work efficiency.
The effect is great because process control becomes easier without relying on skilled workers.

[Brief explanation of the drawing]

Fig. 1: A schematic perspective view of the main parts of the needle position detector of the present invention; Fig. 2: A perspective view of the entire installation of the flocked sewing machine of the present invention; Fig. 3: A schematic diagram of the section where the remaining pile thread is cut by the looper and the attached cutting knife. figure. 1... Sewing machine mounting stand, 2... Flocked sewing machine body,
3... Servo motor, 4... Control unit, 5... Pulley, 7... Foot pedal, 8... Connecting rod, 9... Thread lifting device, 10... Presser foot lifting device, 11...
Needle, 14...looper, 15...cut knife,
16...Needle position detector, 20...Sewing machine upper shaft, 2
2... Reflective plate for optical sensor, 23... Reflective plate for optical sensor, 24... Positioning adjustment, 26...
Light sensor, 27... Light sensor.

Claims (1)

[Scope of utility model registration request] At the end of cut pile sewing using a flocked sewing machine, when cutting the remaining pile yarn held in the looper, a light sensor reflector 22 is installed facing the light sensor 26 of the needle position detector 16, and the light sensor is Light sensor 2 horizontally parallel to sensor 26
7, and the optical sensor reflecting plate 23 facing the optical sensor reflecting plate 23 is arranged at a position that maintains an angle of 90 degrees with the optical sensor reflecting plate 22, and at the beginning of the needle 11 at the end of sewing. The servo motor 3 is attached by setting the stop position at top dead center and rotating the servo motor 3 by 90 degrees 1/4 forward/reverse only by an electric signal from the control unit 4 by depressing the foot pedal 7 in the reverse direction. A flocked sewing machine capable of automatically cutting pile yarn, characterized in that, in conjunction with a thread cutting mechanism, the remaining pile yarn 13 retained on a looper 14 is automatically cut with a cutting knife 15 attached to the looper 14. .