JPS60229682A - Malfunction load detector of copying machine - Google Patents

Abstract

PURPOSE:To prevent a drive trouble due to an overload by measuring the magnitude of a load in the initial state of a driven copying machine. CONSTITUTION:When a fixing heater is fired by a fixing heater ON-OFF controller to arrive at the set temperature, a warmup is completed. After the warm- up is completed, an overload measuring subroutine is started, and 90% of rated voltage is applied to a main motor 27. At this time, the pulse number P1 from a pulse generator 39 is stored in a RAM52. A reference value setter 53 outputs 90% of the rated pulse number as a comparison reference pulse number P1S. A comparator 54 judges as an overload in case of P1<P1S and indicates a maintenance call on an indicator 55.

Description

[Detailed description of the invention] Mr. J! The present invention relates to an abnormal load detection device for a copying machine that detects an increase in load torque and promptly detects an abnormal load torque, thereby ensuring safety against damage to the drive mechanism.

Conventionally, an abnormal load on a copying machine was detected by pressing the copy start print button under conditions of rated voltage or rated current, and then determining the number of pulses obtained by rotating the drive motor within a preset time to a predetermined value. However, because it was set as ``Load Abnormality J'' immediately before copying started, the information was slow and the measures to restore normality were delayed.Also, when the rated voltage or rated current was applied, it was determined that the load was abnormal. ” means that the copier cannot make copies, which is not a preferable method for detecting load abnormalities.

The present invention has been made in view of the above-mentioned circumstances, and provides a copying machine that can measure the quality of the load in the initial driving state of the copying machine and prevent drive troubles due to overload. The present invention attempts to provide an abnormal load detection device.

The configuration of the single-bottom present invention will be described below based on examples.

FIG. 2 is a block diagram of the copying machine mechanism, in which light is irradiated from a halogen lamp 3 onto an original between a pressure plate 1 and a contact glass 2. As shown in FIG. The reflected light from the original is reflected by the first mirror 4. 2nd mirror 5. Third mirror 6, through lens 7, fourth mirror 8
．． It reaches the photoreceptor 10 through the dust-proof glass 9 and forms an electrostatic latent image. On the other hand, the toner from the toner cartridge 11 is transferred to the toner hopper 12. Toner supply roller 13. The electrostatic latent image is supplied via the agitation roller 14 and becomes a toner image by the developing roller 15, which is transferred to the paper sent out via the cassette 16 and registration rollers 17.

The paper onto which the toner image has been transferred is transferred to a fixing heater 19 via conveyance rollers 18. Fixing roller 20. The sheet is sent to a fixing section consisting of a pressure roller 21, where the toner image is fixed, and then sent to a copy receiver 23 by a paper discharge roller 22. In addition, 2
4 is an eraser, 25 is a charger, 26 is a static elimination lamp, 27 is a main motor, 28 is a cleaning blade,
29 is a light charger, 30 is a separation claw, 3+ is a transport fan, and 32 is a fixing section.

FIG. 3 is a diagram showing the layout of a drive system for driving the mechanism shown in FIG. 2, where the drive motor is a phenomenon unit.

A main motor that drives the registration rollers, paper feed conveyance unit, photoreceptor, cleaning unit, fixing unit driven by the conveyance unit, etc. Paper feed table motor 3 that lifts the transfer paper in the cassette tray 16 to the transfer paper feed roller
3. There are three carriage motors 34 that reciprocate the optical system at a predetermined speed.The main motor 27 is an induction motor, and a paper feed table motor 33.
Carriage motor 34 is a DC motor. In addition, 35
3 is a first carriage wire clamp, 36 is a second carriage drive pulley, and 37 is a main motor pulley.

38 is a drum drive pulley, 39 is a pulse shear plate (
40 is a toner supply clutch, 41 is a paper feed clutch, 42 is a registration clutch, 43 is a cleaning drive sprocket, 44 is a cleaning drive gear, 45 is a transport unit drive gear, and 46 is a transport unit drive sprocket.

By the way, for example, the induction motor used in the main motor 27 has a torque (T) as shown in FIG.
)-rotational speed (N) characteristic, and the torque T is approximately proportional to the square of the input voltage. And when inputting 100V, 30K
Assuming that the torque is g-cm, the output is 100 rpts, the number of pulses generated by the pulse disk 39 is 65 pulses/sec, and the load does not change, the voltage is 90V.
At the time of input, the torque is approximately 24.3 Kg-co+, and both the number of rotations and the number of pulse generator pulses are slightly reduced.

This is generally 10 to 15 as the torque margin of the motor.
This is because the load is being rotated with a reasonable torque of about 1.5%, but as the load torque increases, the rotational speed decreases more and more, and eventually it comes to a stop. Therefore, in the present invention,
The input voltage to the motor is set lower than the rated input, and an increase in load torque immediately appears as a drop in rotational speed, which causes the number of pulses in the pulse generator to drop, and by detecting this, an attempt is made to indicate a load abnormality. It is something.

FIG. 1 is a configuration diagram of a load abnormality detection device according to the present invention.
Pulse shear generator 39 driven by main motor 27
The counter 51 of the control unit 50 counts the pulses for a predetermined period of time, and stores the pulses in the RAM 52. Then, the comparator 54 compares the set value of the reference value setting circuit 53, which has set 90% of the rated pulse number as the comparison reference pulse number, and the content of the RAM 52, and the content of the RAM 52 is set to 90% of the rated pulse number.
If it falls below 0%, it is assumed that there is abnormal overeating and the operation display unit 55
will be displayed. This measurement of different wealth will be explained with reference to the flowchart shown in FIG. When the main switch is turned on, a fixing heater ON-OFF control circuit (not shown) turns on the fixing heater, and when the set temperature is reached, warm-up is completed, and the fixing heater is continuously controlled to maintain the set temperature. After the warm-up is completed, the overload measurement subroutine is entered, the main motor is driven at 90% of the rated voltage, and the number of pulses P1 from the pulse generator is stored in the RAM 52 while the 0.5 sec timer is operating. Then, Pl is compared with the overload judgment pulse number P+s, which is 90% of the rated pulse number, and if Pl is larger than PIS, L=1 and it is determined that there is no overload, and if Pl is less than PIS, L=0 and a maintenance call is issued. Display it on the operation panel. In addition,
The copy mode is the same as a regular copier. In this way, in order to solve the problem where the load increases over time and may eventually lead to damage to the drive mechanism, the torque Safety can be ensured by detecting abnormalities.

As described above, according to the present invention, when the load torque increases over time due to toner clogging, oil shortage, etc., an increase in the load torque is detected, and an abnormal load torque is displayed and an alarm is issued at an early stage. This makes it possible to ensure safety against damage to the drive mechanism.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the differential rich/negative @ detection device according to the present invention, Fig. 2 is a block diagram of the copying machine mechanism, Fig. 3 is a diagram showing the drive system of the copying machine, and Fig. 4 is a diagram showing the torque of the motor. FIG. 5, which is a diagram showing the rotation speed characteristics, is an abnormal load detection flowchart. 27... Main motor, 39... Pulse generator. 51...Pulse counter, 52...RAM, 53...
...Comparison reference pulse setter, 54...Comparator, 55.
...Operation display section. 1st Figure 1'tn Figure 4 □ Torque [to (1-cm) '1 go

Claims (2)

[Claims] (1) A pulse disk that rotates following a load driving motor, and a counting means for counting pulses from the pulse disk for a predetermined period of time, and the contents of the counting means and when the rated voltage or rated current is applied. a comparator that compares the number of pulses from the pulse disk within the predetermined time with a predetermined ratio value, and is driven by applying a voltage or current lower than the rated voltage or rated current, and the content of the counting means is An abnormal load detection device for a copying machine, characterized in that an abnormal load is displayed by the output of the comparator when the output is less than a predetermined ratio value. (2) The abnormal load detection device according to claim 1, wherein the abnormality display is a maintenance display.