JPH0145066B2 - - Google Patents

Description

[Detailed Description of the Invention] Copying machines and their peripheral equipment are composed of a combination of parts that perform mechanical operation and parts that perform electrical operation, but their power source is Generally, an induction motor is used. However, as is well known, the number of rotations, inertia, and other characteristics of an induction motor change depending on the power frequency, so copying machines and their peripheral equipment that use induction motors as a power source If it is used in both 50Hz and 60Hz regions, it will operate in different operating states, which may result in not being able to obtain copies with good image quality, or possibly damaging the original. and many other problems.

For example, if we consider the case of a copying machine, in a transfer type copying machine, appropriate charge and exposure amount should be given to the photoconductor drum according to the rotation speed of the photoconductor drum, and proper fixing should be performed. The operating conditions for each part are set to ensure proper operation, but the inductor used as the power source differs when the same copier is used in a 50Hz region and when it is used in a 60Hz region. As the rotational speed of the photosensitive drum changes by about 20%, the rotational speed of the photoreceptor drum also changes by about 20%, resulting in excessive or insufficient exposure and poor fixing conditions. The problem arises.

Also, for example, in the case of a peripheral device for a copying machine, if it is a document feeder, in this case, due to the difference in the inertia of the drive motor in the 50Hz region and the 60Hz region, the document may not be as expected. The document does not stop at the stop position accurately, and as a result, in some cases, the document may stop before reaching the planned stop position, and in some cases, the leading edge of the document may be folded at the planned stop position. This can cause damage to the original. In the document feeder, the power supply to the drive motor that drives the document feed belt is cut off before the leading edge of the document reaches the scheduled stop position.
This is because the document is fed by the inertia of the drive motor from the time when the power supply to the drive motor is cut off until the leading edge of the document reaches the scheduled stop position. .

For this reason, conventional copying machines and their peripheral equipment (document feeders, sorters, collators, etc.) have been designed to allow users to use them as if the operating speed of each component is the same even if the power supply frequency is different. , the above problems were solved by consideration in manufacturing or service. This point will be specifically explained as follows.

In other words, conventionally, for copying machines and their peripheral equipment, dedicated motors are prepared for equipment for 50Hz regions and equipment for 60Hz regions, and during the manufacturing process, motors are separately provided for each destination device. You can incorporate a 50Hz motor into a device, a 60Hz motor into a device, or use one type of motor and use it as a drive sprocket for each destination device during the manufacturing process. In order to prevent the above problem from occurring, efforts were made to prevent the above problem from occurring by installing a 60Hz sprocket, or by replacing the drive sprocket with a specified one when the supplier hands it over to the customer. In the manufacturing process, if devices for the 50Hz region and devices for the 60Hz region are manufactured using different component parts, the number of types of parts increases, making parts arrangement and inventory management complicated. In addition, unless a long-term production and sales plan is established for each device in each destination, it is impossible to order parts, and it is not easy to modify the plan. Problems arise in terms of product quality assurance, an increase in costs required at the time of delivery, and further problems such as a large amount of time required for arranging necessary parts and modification.

The present invention solves the above-mentioned problems in the document feeder of conventional copying machines by making devices for 50Hz and 60Hz regions of the same configuration without distinguishing them, and The copying machine of the present invention and its surroundings are configured so that the frequency value of the power supply frequency is identified and each component part of the device is controlled to perform an appropriate operation according to the identification result. Specific details regarding the equipment will be explained in detail with reference to the attached drawings.

FIG. 1 is a block diagram of a copying machine including an original feeding device of the copying machine of the present invention. In this FIG. When the document is inserted from the document insertion slot 3,
An input roller is placed onto a conveyor belt 7 which is wound and tensioned between a drive pulley 5 which is driven via a belt 4 by the rotation of a drive motor IM, a turn roller TR which rotates integrally with a driven pulley 6, and a driven pulley 6. 8 to a specified position on the contact glass 9.

Reference numeral 10 denotes a document stopping member that regulates the stopping position of the leading edge of the document 2. This document stopping member 10 is inserted into the document path formed between the conveyor belt 7 and the contact glass 9 by a solenoid (not shown). It is said that you can come and go as you like. 11 is the exit roller, 1
2 is a document setting switch; 13 and 14 are detectors for detecting the presence or absence of a document; and 15 and 16 are discharge rollers. (For the general configuration and operation of the document feeder having the above configuration, please refer to, for example, the description in Japanese Patent Laid-Open No. 53-91747.) EC is an encoder that generates timing pulses according to the rotation of the drive pulley 5,
The output pulses of this encoder EC are given to the control device C.

Part A of the document feeding device is rotatably mounted on a shaft 17 with respect to the main body B of the copying machine,
If the copying operation is to be performed without using part A of the document feeder, rotate part A of the document feeder about shaft 17 in the direction of arrow R in the figure to perform the copying operation. The portion of the document feeder A is removed from above the contact glass 9 of the main body B of the copying machine, and the original is placed directly on the contact glass 9 of the main body B of the copying machine to perform the copying operation.

In FIG. 1, the main body B of the copying machine is a well-known type consisting of a photosensitive drum, an exposure light source, an exposure optical system, a developing section, a transfer section, a fixing section, a cleaning section, a paper feeding section, etc. It is a transfer type copying machine. Further, in FIG. 1, C is a control device provided to control the operation of each part of part A of the document feeder, and this control device C includes, for example, a microprocessor, a read-only memory ROM, and a random access memory. A configuration including a microcomputer configured with memory RAM or the like may also be used.

In Figure 1, AC is a commercial frequency AC power supply that supplies operating power to the copying machine and its peripheral equipment, and the frequency value of the AC power supplied from the AC power supply AC to the equipment is Depending on the region where it is used, it may be 50Hz or 60Hz.

AC power from the AC power supply AC is given to the drive motor IM via the solid state relay SSR, and is also supplied to the DC stabilizing power supply circuit via the transformer T.
SDC and the power frequency identification signal generation circuit IS. The DC stabilized power supply circuit SDC sends out stabilized DC working power from the output terminal 18, and the DC power sent to the terminal 18 is used for the operation of the control device C and other various circuits.

The AC voltage induced in the secondary winding 19 of the transformer T has the frequency value of the commercial AC power source in the area where the device is used, but the AC voltage is generated by the power supply frequency identification signal generation circuit IS. The signal is applied to a diode 22 via a resistor 20 for half-wave rectification, and is applied to a comparator via a resistor 21. In the illustrated example, the comparator is composed of an operational amplifier 23, resistors 24 to 28, and a diode 29. An identification signal Si of a power supply frequency having a pulse width approximately equal to a positive half wave in the wave is generated and is applied to an input port Bo of a control device C. Since the length of the high-level state period of the power frequency identification signal Si changes depending on how the resistance values of the resistors 24 to 26 are set, the output signal Si of the power frequency identification signal generation circuit IS It is easy to select the resistance values of the resistors 24 to 26 so as to obtain a signal with a pulse width that approximately corresponds to a half-wave period of the AC voltage waveform of the AC power supply.

Therefore, the signal generation circuit for power frequency identification
When the frequency value of the AC power source AC is 50 Hz, the IS sends out a power frequency identification signal Si with a pulse width of approximately 10 milliseconds, and when the frequency value of the AC power source AC is 60 Hz, An identification signal Si having a power supply frequency and a pulse width of approximately 8.3 milliseconds is transmitted.

In the control device C to which the above-described power frequency identification signal Si is applied to the input port Bo, for example, the above-described power frequency identification signal Si is supplied to the input port Bo by a timer.
The frequency of the AC power supply that supplies operating power to the equipment is measured by measuring the pulse width of 50%.
Hz or 60Hz, and depending on the identification result, the timing pulse number settings in various control routines that determine the timing of each part's operation are changed to ensure that each part operates properly. The purpose is to make sure that

As the encoder EC, for example, one composed of an optical pattern, a light source, and a photoelectric conversion element, a magnetic type, or any other type can be used, but the timing pulses generated from the encoder EC can be used as needed. The output pulse Pt from the waveform shaping circuit WS is applied to the waveform shaping circuit WS through the noise limiter and the resistor 39, which are configured by a capacitor 30 and a resistor 61, which are provided accordingly. Given to Ao.

As the waveform shaping circuit WS, one constructed of an operational amplifier 32, resistors 33 to 35, and a diode 36 can be used.

FIG. 2 is a flowchart for explaining an example of how to identify the power supply frequency described above performed within the control device C. First, the input port Bo is set to 0.
Check whether it changes from 1 to 1 (from low level to high level), and set a timer (9.5 milliseconds) when input port Bo becomes 1. Next, check the state of input port Bo at the time when the timer finishes counting, and when input port Bo is in the state of 0, the power supply frequency is assumed to be 50Hz, and the output of the flip-flop indicating the determination result of the power supply frequency is set to 0. Also, if the state of the input port Bo is 1 when the timer finishes counting, it is assumed that the power supply frequency is 60Hz, and the output of the flip-flop indicating the determination result of the power supply frequency becomes 1, and the program moves to the main routine. be.

FIG. 3 is a flowchart illustrating how the drive motor IM in the document feeder is controlled according to the power frequency identification results described above. First, the power frequency determination results are shown. Check whether the output of the flip-flop is 0 or not, and if the output of the flip-flop is 0, set the control conditions in the control device C so that the drive motor IM can be rotated for the period in which 32 timing pulses are counted. Also, if the flip-flop output is 1, the drive motor IM is 30
Setting the control conditions in the control device C so that the rotation can be performed for a period during which timing pulses are counted, and then outputting an output to the output port Eo to turn on the transistor 38 via the resistor 37. The solid state relay SSR rotates the drive motor IM.

In this way, by switching the rotation time of the drive motor IM depending on whether the power supply frequency is 50Hz or 60Hz, the leading edge of the document is always The document can be stopped when it reaches the proper stop position, and the document will not be damaged. In FIG. 1, inputs to other input ports are output information from detectors 13, 14 and other sensors, and outputs from other output ports are provided for controlling the operation of each part. It is used as a drive control signal for solenoid, clutch, etc.

As described above, the copying machine and its peripheral equipment of the present invention can automatically change the operating condition settings according to the power frequency, even in 50Hz or 60Hz regions.
Even in the Hz region, devices with the same configuration can always operate in a good manner, and according to the present invention, all of the conventional problems mentioned above can be satisfactorily solved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIGS. 2 and 3 are flowcharts for explaining the operation. IM...drive motor, AC...alternating current power supply, IS...signal generation circuit for power frequency identification, C...control circuit, EC
...Encoder, WS...Waveform shaping circuit, SSR...Solid state relay.

Claims (1)

[Claims] 1 As a drive motor used as a power source,
A model that changes the number of rotations depending on the frequency of the power supply is used, and after the power to the drive motor is cut off, the document is transported by the inertia of the drive motor,
In a document feeder of a copying machine configured to stop the leading edge of a document at a regular stop position,
A means for generating timing pulses according to the rotation of the drive motor, a means for counting timing pulses, a means for identifying the frequency of the power source, and a set value of the number of timing pulses is changed in accordance with the identification result of the frequency of the power source. means for supplying power to the drive motor until the count value of the timing pulses described above reaches the set value of the number of timing pulses, and supplying power to the drive motor after the count value of the timing pulses described above reaches the set value of the number of timing pulses A document feeder for a copying machine, comprising a control means for cutting off power to the copying machine.