JPH0747107Y2 - Sewing machine protector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a protective device for a sewing machine.

(Prior Art) In a conventional sewing machine, as shown in FIG. 3, oil is respectively placed in the front metal 3,4, rear metal 5,6 of the lower shaft 1 and the upper shaft 2 of the sewing machine, and the middle metal 7 in the upper shaft. Refueling pump 10 via pipes 8 and 9
The oil is diverged by the oil supply, and a part of the oil passage of the upper shaft 2 is provided with an oil window 11 for observation, which is open to the atmosphere, through which the presence or absence of oil can be confirmed to check the oil supply status. The machine controls the operation of the sewing machine according to the driver's sensation by catching the occurrence of abnormality and the precursory phenomenon.

12 is a sewing machine motor.

(Problems to be Solved by the Invention) However, the conventional sewing machine as described above has the following disadvantages.

1. When the sewing machine is operated, the refueling pump 10 is also rotated at the same time, and the oil from the refueling pump 10 is sent to the refueling section through each pipe. In reality, however, the pump begins to rotate and the oil reaches the refueling section. There is some time left in the machine, and there is a delay in refueling, and at the same time as the sewing machine turns, the part that needs oil will turn temporarily without refueling.

It may run without lubrication due to other troubles such as pumps or forgetting to add oil. If the rotation speed is low, it will not be a problem, but in the high speed range of about 4500 spm or more it will cause an initial failure.

2. Since the sewing machine's condition must be judged only by the human senses, even if something goes wrong, even if you do not go to the part where oil is needed, you will drive until you understand it, resulting in seizure. It causes wear and the like.

3. Even if refueling is not enough, it will deteriorate in the long term even if it does not occur immediately, and it will develop into a failure, but its judgment is impossible.

4. An oil window open to the atmosphere is used to check the presence or absence of oil, but this reduces the hydraulic pressure of the entire lubrication mechanism.

5. Since the amount of oil in the oil window is wasted as oil, the amount of oil to be supplied to other parts is reduced accordingly.

6.Since oil easily goes to the oil window that is open to the atmosphere, it becomes difficult for oil to reach important parts such as the balance needle and metal bearing at the other end, and oil supply drops at the parts that originally require oil supply. Occurrence occurs, and in the worst case, a failure such as seizure or abrasion is induced.

The present invention eliminates the above drawbacks.

(Means for Solving the Problems) A protective device for a sewing machine according to the present invention comprises an oil supply pump for supplying oil to each part of the sewing machine that requires oil supply, a hydraulic pressure sensor for detecting the discharge side pressure of the oil supply pump, It is characterized by comprising a sensor provided in each part for detecting an abnormality in refueling, and a sewing machine protection circuit for suppressing the rotational speed of the sewing machine motor to a predetermined value or less when any of the above sensors shows an abnormal value.

(Operation) In the protection device for a sewing machine of the present invention, the rotation speed of the sewing machine motor is automatically suppressed when the oil is not sufficiently supplied to the important part at the end.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, a pressure sensor 13 is provided on the oil discharge side of the oil supply pump 10, and further, the metal pressure sensor 14 is provided on each of the metals 3 to 7 and the pot and the balance portion.
20 is provided, and the oil supply display mechanism 21 such as a light emitting diode is driven by the output of the oil pressure sensors 13 to 20 so that the presence or absence of oil in each part can be displayed, and the output of any one of the above oil pressure sensors is a predetermined value. When it has not reached, the sewing machine protection circuit 22 is operated to suppress the rotational speed of the sewing machine motor 12 to, for example, 4500 spm or less.

The sewing machine protector of the present invention, which has the above-mentioned structure, can detect the oil supply state to the metal, the surface portion, the hook, etc., and when the required amount of oil is not supplied in the high speed region, the motor rotation speed is partly changed. Measures such as deceleration can be taken, there is no need to open the oil to the atmosphere, the sealing of the oil supply path can be improved, oil can be efficiently supplied to each part, and failure due to lack of oil in each oil lubrication part Can be prevented in advance.

In the present invention, since the portion where refueling is required also generates heat, the hydraulic sensor is replaced with a temperature sensor to detect the abnormality of the sewing machine by checking the status of heat generation in the above-mentioned portion and its surroundings to prevent failure. You can

(Effects of the Invention) As described above, according to the sewing machine protector of the present invention, it is possible to prevent a malfunction such as seizure or abrasion of each movable part of the sewing machine.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a sewing machine protection device of the present invention, FIG. 2 is a flowchart thereof, and FIG. 3 is an explanatory diagram of a conventional sewing machine. 1 …… Lower shaft, 2 …… Upper shaft, 3,4 …… Front metal, 5,6 …… Rear metal, 7… Medium metal, 8,9 …… Oil pipe, 10 …… Refueling pump, 11 …… Oil window, 12 ... Sewing machine motor, 13-20 ...
Pressure sensor, 21 …… Refueling display mechanism, 22 …… Sewing machine protection circuit.

Claims (1)

[Scope of utility model registration request] 1. A refueling pump for refueling each portion of a sewing machine that requires refueling, a hydraulic pressure sensor for detecting a discharge side pressure of the refueling pump, a sensor for detecting a refueling abnormality provided in each of the above parts, A sewing machine protection device comprising a sewing machine protection circuit for suppressing the number of revolutions of the sewing machine motor to a predetermined value or less when any of the sensors indicates an abnormal value.