JPH0351350Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention is designed to prevent knitting needles or their butts from getting caught for some reason during the operation of a circular knitting machine for knitting socks, pantyhose, etc. The present invention relates to an emergency stop device for a circular knitting machine, which detects when an emergency stop is forced due to the occurrence of an accident such as an inoperable state and stops the operation of the circular knitting machine.

(Prior Art) Generally, knitting needles in circular knitting machines with a relatively fine needle pitch (gauge) are thin.

This type of emergency stop device for circular knitting machines that has already been proposed is designed to prevent the knitting needles or their butts from colliding with the cam of the cam drum for some reason during knitting, causing the knitting needles or their butts to break, etc. When an accident occurs, a knitting needle abnormality detection device installed on the path through which the knitting needles pass will detect breakage of the knitting needles or their butts, and will emergency stop the operation of the circular knitting machine based on this detection signal. It's summery.

(Problem to be solved by the invention) However, in the emergency stop device of the circular knitting machine described above, the knitting needles of the circular knitting machine used for knitting thick socks, tights, pantyhose, etc., have a needle pitch (gauge). Because relatively coarse or medium-coarse type knitting needles are used, the coarse or medium-coarse type knitting needles have a thick wall thickness. Even if for some reason it collides with the actuating cam, the knitting needles and their butts will remain collided and will not break, so the knitting machine cylinder will continue to stop rotating, and the drive motor will overheat or the circular knitting machine will The transmission belt may slip, overheat, and burn out.

On the other hand, the drive motor control circuit is equipped with a motor protection circuit such as a motor protector or thermal relay, and this motor protection circuit detects overload of the drive motor. When the transmission belt of the machine slips, the overload condition is not transmitted to the drive motor, the motor protection circuit is activated, and the current that is sufficient to trip the motor does not flow, and the drive motor continues to rotate. There is a risk of heat generation and burnout.

Furthermore, if an excessive tension is applied to the drive belt to prevent the drive belt from slipping, there is a risk of burnout of the mechanisms and devices of the circular knitting machine, such as shafts, bearings, and belts.

The present invention has been developed in view of the above-mentioned circumstances, and is intended to be used in circular knitting machines in which knitting needles of relatively coarse or medium-coarse needle pitch (gauge) are constructed with a thick wall. Therefore, even if the knitting machine collides with the operating cam during knitting,
In the event of an emergency stop, such as when the knitting machine cylinder stops rotating due to the knitting needles or their butts colliding and not breaking, the rotation detector detects abnormal rotational movement of the detected part. It is an object of the present invention to provide an emergency stop device for a circular knitting machine, which operates a control device and an alarm indicator light for the drive motor through a monostable multivibrator circuit to emergency stop the drive motor.

[Structure of the idea]

(Means for Solving the Problems and Their Effects) The present invention provides a circular knitting machine that is connected to a drive motor equipped with a drive motor control device via a belt. A detection part is attached, a rotation detector is provided facing the rotation path of the detection part, a monostable multivibrator circuit is connected to the rotation detector, and a latch circuit is connected to the monostable multivibrator circuit. On the other hand, the drive motor control device is connected to the monostable multivibrator circuit via a power-on reset circuit, and in the event of an emergency stop, the rotation detector detects abnormal rotational movement of the detected part. Upon detection, the drive motor control device and alarm indicator light are activated through the monostable multivibrator circuit to safely and urgently stop the drive motor.

(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

In FIGS. 1 and 2, reference numeral 1 denotes a knitting machine cylinder in a circular knitting machine used for knitting, for example, thick socks, tights, pantyhose, etc.
A drive motor 3 is connected via a belt 4 to a transmission wheel 2 that is integral with the rotating shaft 1a of the knitting machine cylinder 1, and the drive motor 3 includes a start switch 5a and a stop switch 5b. A drive motor control device 6 having an operation switch 5 is connected thereto.

On the other hand, a part of the knitting machine cylinder 1 is provided with a detected part 7 formed of a protrusion or a notch, and a stationary member located on the rotation path of this detected part 7 has, for example, a non-contact point. Rotation detectors 8 such as switches, proximity switches, etc. are provided facing each other. Further, a monostable multivibrator circuit (also referred to as monomulticircuit) 10 is connected to this rotation detector 8, and this monostable multivibrator circuit 10 includes a first monostable multivibrator 10a and a second monostable multivibrator. 10b. Furthermore, this first monostable multivibrator 10a
are the high, medium, and high rotational speeds of the knitting machine cylinder 1;
C ₁ of the first monostable multivibrator 10a is set in advance at a set time T ₁ which is somewhat longer than the cycle time T ₀ of the rotation clock (rotation signal) CK at the lowest speed among the speeds during low and inching. , _R2 , and constitutes a circuit that performs a re-trigger operation.

That is, since the output time of the first monostable multivibrator 10a is set to be longer than the rotation cycle time of the slowest knitting machine cylinder 1 during normal operation, the input of the rotation clock CK during normal operation (knitting machine Since the rotation input signal of the cylinder 1 is continuously input within the set rotation period time of the knitting machine cylinder 1, the first monostable multivibrator 10a is retriggered and the output signal remains unchanged. It continues to output H level (high level) (see Figure 2).

That is, during normal operation, the rotation period of the slowest knitting machine cylinder 1, for example, the clock period T ₀ during inching operation, is shorter than the set time T ₁ of the first monostable multivibrator 10a, so (T ₀ > T ₁ ), the first monostable multivibrator 1 triggered by the input of the rotation clock CK
0a is retriggered because it is triggered by the next rotation clock CK input before the set time _T1 ends, and its output _Q1 remains unchanged and the output signal remains at the H level ( Since the second monostable multivibrator 10b is not triggered and the output Q ₂ does not change, the output signal remains at the H level. (high level) and normal operation continues.

On the other hand, as described above, the second monostable multivibrator 10b presets C ₂ , _{C 2 ,}
It is set by a time constant circuit using R ₂ , and
It constitutes a circuit that performs re-trigger operation. or,
The second monostable multivibrator 10
An amplifier 11 composed of a buffer 11a and a transistor 11b is connected to the drive motor control device 6, and this amplifier 11
and the second monostable multivibrator 1 mentioned above.
For example, an alarm indicator light 13, which is an abnormality detection indicator light, is connected to 0b via a latch circuit 12. Further, a power-on reset circuit 9 including, for example, an AND circuit 9a is connected to the second monostable multivibrator 10b,
This AND circuit 9a is connected to the drive motor control device 6.
It is connected to the.

The operation of the present invention will be explained below.

Therefore, if the butt of a knitting needle collides with a part of the inner surface of the cylinder cam for some reason in the knitting machine cylinder 1, the coarse wall thickness gauge will not break and the knitting machine cylinder 1 will not break. 1 is prevented from rotating and continues in that state, the load on the drive motor 3 suddenly increases, and as a result, the belt 4 slips.

For this reason, the knitting machine cylinder 1 remains in a stopped state or the clock cycle T ₀ becomes longer, so the rotation detector 8 does not receive a signal from the detected device 7 within a predetermined time, so the first monostable multi The input of the rotation clock CK of the vibrator 10a is
Since no input is made within the set time T ₁ input in advance, after the elapse of this set time T ₁ , the second
As shown in the timing chart in the figure, the output _Q1 to the first monostable multivibrator 10a changes to L level. Then, this change in L level becomes an input to the second monostable multivibrator 10b, and this second
The monostable multivibrator 10b inputs a signal with a set time _T2 , which has been set and input in advance through a time constant circuit made up of _R2 and _C2 , to the amplifier 11.
Since the signal is transmitted to the alarm indicator lamp 13 through the latch circuit 12, when the amplifier 11 stops driving the drive motor 3 via the drive motor control device 6, the alarm indicator lamp 13 is turned on at the same time.

Furthermore, as shown in Fig. 2, the above R ₂ and C ₂
The set time input by the time constant circuit
It is desirable that T ₂ be a sufficient time interval so that the drive motor 3 is completely stopped.
Furthermore, when the circular knitting machine is stopped, for example, when it is stopped manually or when other abnormalities are detected, the drive motor control device 6
It has come to be controlled by

In this way, the present invention provides the drive motor 3
can be stopped in an emergency. Furthermore, if the butt of the knitting needles in the knitting machine cylinder 1 is returned to its normal state, the emergency stop device of the circular knitting machine of the present invention is adapted to return to its original state again.

[Effect of idea]

As described above, according to the present invention, in a circular knitting machine which is connected to a drive motor 3 equipped with a drive motor control device 6 via a belt 4, a part of the knitting machine cylinder 1 of the circular knitting machine is covered. A detection section 7 is attached, a rotation detector 8 is provided facing the rotation path of the detected section 7, and a monostable multivibrator circuit 10 is connected to the rotation detector 8. An alarm indicator light 13 is connected to the monostable multivibrator circuit 10 via a latch circuit, and a drive motor control device 6 is connected to the monostable multivibrator circuit 10 via a power-on reset circuit 9. Detects abnormal rotational movement of the detected part 7 and activates the drive motor control device 6 and alarm indicator light 13 through the monostable multivibrator circuit 10, so heat generated when the drive motor 3 is clocked causes burnout and the belt. This eliminates the risk of burning out the parts 4, etc., and has excellent effects such as improving reliability and safety.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an emergency stop device for a circular knitting machine of the present invention, and FIG. 2 is a timing chart for explaining the operation of the present invention. 1... Knitting machine cylinder, 3... Drive motor, 4...
... Belt, 6 ... Drive motor control device, 7 ... Detected part, 8 ... Rotation detector, 10 ... Monostable multivibrator circuit, 10a ... First monostable multivibrator, 10b ... Second monostable Table multivibrator, 11...
Amplifier, 12...Latch circuit, 13...Alarm indicator light.

Claims (1)

[Scope of utility model registration request] In a circular knitting machine that is connected to a drive motor equipped with a drive motor control device via a belt, a detected part is attached to a part of the knitting machine cylinder of this circular knitting machine, and a detected part is attached to a part of the knitting machine cylinder of this circular knitting machine, and the detected part is placed on the rotation path of this detected part. Rotation detectors are provided facing each other, a monostable multivibrator circuit is connected to the rotation detector, a warning indicator is connected to the monostable multivibrator circuit via a latch circuit, and the monostable multivibrator circuit is connected to the monostable multivibrator circuit. A drive motor control device is connected to the motor via a power-on reset circuit, and in the event of an emergency stop, the rotation detector detects abnormal rotational movement of the detected part, and the drive motor control device and alarm are transmitted through the monostable multivibrator circuit. An emergency stop device for a circular knitting machine characterized by activating an indicator light.