JPS6369420A - Emergency stopper of driving motor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a printing press, etc.; and an emergency stop device for a drive motor used therein.

(2) Conventional technology Some kind of abnormality (for example, mechanical lock) occurs in the load system of the printing press, and the load suddenly increases! - In the event of an increase, the drive motor must be stopped immediately. Conventionally, as such an emergency stop device for a drive motor, there is a device that uses a fuse or a breaker that interrupts an electric circuit by utilizing the current that increases as the load increases. However, the main purpose of fuses and breakers is to protect the drive motor from overheating (i.e., burnout), and because their operating principle is to generate heat due to excessive current, they have problems such as slow response and inconsistent operating time. Request to stop C2 was not answered.

Therefore, under the conventional device, as the load increases, the generated torque also increases accordingly, so the motor continues to increase torque, and the drive transmission system (-- excessive torque is applied, and in the worst case C2 There were drawbacks such as the drive transmission belt flying off and gears missing.This kind of belt and gear destruction usually takes less than one second5; as mentioned above, it progresses. Fuses and breakers with slow response times would occur twice before tripping, resulting in unavoidable damage.

(3) Purpose This invention eliminates the drawbacks of the above-mentioned conventional devices and provides a device that can instantly stop the drive motor to prevent damage to the drive transmission system when the load increases during abnormal loads. The purpose is to

(4) Structure In order to achieve the above object, the emergency stop device of the present invention includes:
Voltage comparison that compares the rotational speed of the drive motor (means for generating a bi-proportional voltage, and compares the voltage with a reference pressure, and outputs a signal when the voltage exceeds the reference voltage by 1!Ntfj) by 677t%. and the output signal C of this voltage comparator;
The present invention is characterized by further comprising means for stopping driving of the motor.

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

This embodiment is applied to a printing machine. In FIG. 1.2, l is a rotating drum, and a pulley 2 is attached to the rotating shaft l2 of the drum l.

A drive transmission belt 5 is wound between the pulley 2 and a pulley 4 coaxially integrated with the gear 3. gear 3
E; is meshed with two onions 8 coaxially integrated with gear 7, and gear 7 is meshed with a pinion 11 attached to the rotating shaft of drive motor IO.

The rotation axis C of the motor 10 is attached to the outer periphery (a slit disk 13 in which slits are formed, and the vicinity C of the slit disk 13 is the slit L of the disk 13), so that an optical path is opened. A photointerrupter 15 is installed to detect the rotational speed of the motor 10 based on the number of openings and closings of this optical path.The photointerrupter 15 and the slit disk 13 form a rotational speed detector 17. is the rotational speed C of the motor 10; C: is designed to output a rectangular wave of a corresponding frequency.

18 is an f conversion circuit which receives the signal output from the rotational speed detector 17 and converts the frequency C into a proportional voltage C;
Reference numeral 9 designates a speed control circuit in which a drive signal is generated to correct deviation from the set speed in accordance with the rotational speed voltage (2).

, 20 is a drive circuit that receives a drive signal output from the speed control circuit 19 and drives the motor ]0;
2 is a comparator which receives the rotational speed voltage output from the F/V conversion circuit 18 and calculates the voltage of 1tft! When the voltage falls below the reference voltage, a signal is output to the control circuit 23, and the control circuit 23 sends a command to the drive circuit 20 to stop driving the motor O.
1: is output, and this C2 causes the drive of the motor IO to be stopped.

In C2 above, the load system of the printing press (in a normal driving state where no abnormality occurs, the rotational driving force of the motor 10 passes through the gear 3.7 as a reduction mechanism, the pinions 8 and 11, and the transmission belt 5). drum 11; the drum 1 is rotated at a predetermined speed.When the drum l is rotating at a predetermined speed, the rotational speed voltage converted by the F/V conversion circuit J8 is higher than the reference voltage. Since the comparator 22 does not output a signal to the control circuit 23, the comparator 22 does not output a signal to the control circuit 23.

On the other hand, the printing press's load system L: An abnormality occurs and the load suddenly increases C.
; When the rotation speed of the motor 10 increases, the rotation speed of the motor 10 decreases. When the rotation speed of the motor IO decreases, the rotation speed detected by the rotation speed detector 17 and the lightning converted by the F/V conversion circuit 1B,
The voltage also decreases and falls below the reference voltage. and,
This lowered voltage is sent to the comparator 221 and compared with the reference voltage, but as described above? Since the voltage falls below the two reference voltages, the control circuit 23 (two signals are output from the comparator 22,
As a result, a command to stop driving the motor 10 is output from the control circuit 23 to the drive circuit 20, and the motor 10 is stopped. There are times when the voltage converted by the F/V conversion circuit 18 and sent to the comparator 22 (2) does not reach the reference voltage (1); , the signal is processed by the control circuit 23, and no drive stop signal is output from the control circuit 23 to the drive circuit 20.

In the above embodiment, the rotational speed F/V conversion circuit 18 is designed to convert the voltage (:), but this is not just an example. The rotation speed voltage may be measured using a so-called tachometer or the like.

The printer is installed near the outer periphery of the printing machine (: is equipped with a detection mechanism for paper feeding, paper discharge jam, etc. as shown in Figures 4 to 6. #! 31 and 32 in Figure 4 are drums). drum position sensor.

33 is a printed sheet count switch installed near the press roller 34; 35.36 is a paper ejection section 37I; a jam sensor is installed; these sensors 31, 32, 3
5.36 and switch 33 are respectively connected to two control units 38 as shown in FIG.

In the above (:), each time printing starts and the drum 5 rotates once, the drum position sensor 33.32 to Fig. 6C
2.C Nipulse 4 as shown.

42 occurs. Using this generated pulse 41.42 as a timing pulse, the control unit 38 determines the pulse 43 generated by the print number count switch 33 and the pulse 45.46 generated by the jam sensor 35. Detects paper jams, etc.

Next, we will explain how to detect jams when each jam occurs (see Figure C of tg6).

<1> Paper feed jam When the generated pulse 42 of the drum position sensor 32 rises, the control unit 38 takes in the pulse 43 generated by the C2 print number count switch 33. If it is LOW, it is a paper feed jam; if it is HIGH, it is normal. The control unit 38 determines whether the paper is fed and detects a paper jam.

<2> Paper discharge jam When paper feeding is performed without a paper jam occurring, the print number count switch 33 is turned ON, and the generated pulse 43
When I rises, the control section 38 takes in the pulses 45 and 46 generated by the jam sensor 35 and 36, and the HIGH
If so, the paper is ejected jammed, and if it is LOW, the paper is ejected normally and the control unit 38
is determined and a paper jam is detected.

<3> When paper is fed without paper roll-up and paper jam occurs, the printing paper passes over the jam sensor 35.36, thereby controlling the noise 45.46 that occurs at the jam sensor 35.36. Section 38 will take it in. On the other hand, when the pulse 42 of the drum position sensor 32 rises, the jam sensor 35
When the /9 pulse 41 of the drum position sensor 3 rises, the pulse 45 of the jam sensor 36 is output.
6 is taken in by the control unit 38, and if it is LOW, the ejected paper rolls up,
If it is HIGH, the control unit 38 determines that the paper is normally ejected, and detects the winding of the ejected paper.

As mentioned above, detection of C2 paper feed and paper discharge jams is possible with a small number of sensors and switches, and the detection performance is comparable to that of the conventional system in which a large number of dedicated sensors and the like are installed.

The printing machine C: is provided with a paper ejecting mechanism as shown in FIG. 7.8 C2. In FIG. 7 (A1), 50 is a paper delivery stand, and the end plate 51 of the paper delivery stand 50 (2 is a cushioning material 52 is attached).
A paper discharge presser bar 53 is disposed on one side of the paper sheet 1 . The base end 53a of the presser bar 53 is pivotally supported by a stopper 55, and is rotatable along the surface (2) of the end plate 51 from the solid line position on the paper output tray 50 to the chain line position outside the paper output tray 50. The tip side is bent upward at an angle θ from a portion 53b that contacts the top surface of the paper ejection tray 50 when no paper is ejected, and the paper is ejected at the bent portion 53c. It is designed to guide the leading edge of the paper.

Therefore, as shown in FIG.
As shown by the arrow, the presser bar 53 gradually moves upward (:
Also, when you take out the ejected printing paper from the paper ejection tray 50, or when you store and set the paper ejection tray 50 in the printer main body l:
Rotate so that it does not get in the way C: Move to the chain line position gc C: Easier l: When taking out the paper, it is possible to set the paper ejection table 50, and the operability is good.

FIG. 8 shows a modified example of the presser bar, and the base end 63m of this presser bar 63 is pivotally supported by an upper end stopper 64 of an end plate 51, and the paper is ejected from the solid line position on the paper ejection table 50. Chain line position l outside the stand 50: A base 63b that is rotatable and whose tip side is almost parallel to the paper ejection table 50 when no paper is ejected, and the tip and rear ends of this base 63b are the base. 63b
The distal end portion 6 is pivoted by a stopper 65 so as to form an angle C with
It consists of 3c. (in FIG. 8) shows the paper discharge state, and the leading edge of the discharged printing paper is guided by the leading end portion 63c and is stacked on the paper discharge tray 50 C:.

When taking out the discharged printing paper or setting the paper discharge tray 50, the presser bar 63 is rotated to the chain line position C:.

(5) Effect This invention is as described above, and detects the rotational speed of the motor which decreases as the load increases, converts this rotational speed into voltage, and then compares it with a reference voltage. Since C2 is set to stop the motor drive, there is no abnormality.
The time from when a load is applied until the drive stops is very short, and the response is extremely fast. Therefore, it is possible to stop the motor drive before the generated torque of the motor exceeds the allowable torque of the drive transmission system, and it is possible to prevent damage to the drive transmission system such as belt skipping or gear chipping. This has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts showing one embodiment of the present invention, and FIG.
The figure is a block diagram showing the control system as above, Figure 3 is a main timing chart of the control system as above, and Figure 4 is a front view showing the bifurcated paper feeding, paper discharge jam, etc. detection mechanism as above.
Figure 5 is a block diagram of the control system of the detection mechanism in Figure 4;
The figure is a timing chart of the control system, Figure 7 shows the discharging mechanism installed in the same paper, the figure is a perspective view, (B) △ is a perspective view for explaining the operation, and Figure 8 is another paper discharge mechanism. The living structure is shown, and the figure is a front view, and (B) is a perspective view for explaining the action. l...Drum 2.4...Pulley 3.
7... Gear 5... Drive transmission belt 8
, ]l...pinion ]0... drive motor]
3... Slit disk 15... Photo interrupter] 7... Rotation speed detector 18...F
/V conversion circuit 19...speed control circuit 20...
・Drive circuit 22...Comparator 23...Control circuit Patent applicant Rico Co., Ltd. - Agent Patent attorney Shigeru Tsukimura and one other person. 7L' Figure 1 Figure 2 - J5 Figure 3 Figure 4 Figure 8

Claims (1)

[Claims] 1. means for generating a voltage proportional to the rotational speed of the drive motor; a voltage comparator that compares the voltage with a reference voltage and outputs a signal when the voltage falls below the reference voltage;
An emergency stop device for a drive motor, comprising means for stopping the drive of the motor based on the output signal of the voltage comparator.