JPH0629096A - Strobe light source charging method for copy printer - Google Patents

Abstract

PURPOSE:To restrain increase in charging time and to reduce current by sequentially starting the current supply to respective strobe power source parts according to the time lag preliminarily set at the time of stroboscope charging. CONSTITUTION:Upon use of eight large strobe units the respective strobe illuminating parts (a) thereof are respectively connected to eight strobe power supply parts (b) and the power supply of 100V (f) to each strobe power supply part is carried out directly on one side while through a relay of a controller (d) on the other side. The eight relays are operated respectively in order or by the combination according to the time lag preliminarily set to supply current to the strobe power source parts (b). When illumination is sensed by a sensor (c) all the relays are set free and charging is started sequentially according to the preliminarily set time lag. The method of setting the time lag can be selected arbitralily from the electrical type and the mechanical type. Increase in charging time is restrained accordingly to reduce current.

Description

Detailed Description of the Invention

[001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rapidly charging a copying printer having a plurality of large strobes with a small amount of electric current.

[002]

2. Description of the Related Art When copying a large size original document at the same size or further, a large amount of illumination light source is required because the sensitivity of the photosensitive material used is low. If this is done with a large number of tungsten lamps or halogen lamps, a large current is required for a long time, and a large amount of heat is generated, which considerably deteriorates the working environment. Further, these lamps have a problem that unevenness in illumination occurs because the lamp light quantity decreases as the lighting time elapses, and the individual lamp light quantity changes.

[003]

When a large-sized strobe is used as the illumination light source, there is a great effect that there is almost no heat generation and the decrease in the light amount with time is extremely small. Also, compared to the case of a tungsten lamp or a halogen lamp that continuously lights up, the electric charge can be reduced because the electric capacity is much smaller. However, charging a large flash requires a large current. For example, CL manufactured by Comet Co., Ltd.
In the case of the 5000 power supply unit, charging is completed in about 5 seconds, but the initial charging current is 90A, so for example, when trying to start charging 8 units at the same time, a large current of 720A is required in total.
Preparing such a large current line for a short charging time is accompanied by the addition of a power receiving device and an increase in contracted power, resulting in a significant cost increase. In addition, if the power supply units are charged one by one, the current will be 90A, but it takes about 1 minute to fully charge the battery, which causes a practical problem. Since there is a leak in the power supply unit that has been charged, it has to be replenished, which takes time and effort, and stable charging cannot be performed. An object of the present invention is to solve the above problems and to charge a large number of strobes with a simple device quickly and with a small current.

[004]

SUMMARY OF THE INVENTION The present invention relates to strobe charging of a copying printer having a large number of strobes.
The problem was solved by sequentially energizing each strobe power supply unit according to a preset time lag.

[0095]

4 is a graph showing the required current measured from the start of charging to the end of charging in the CL5000 strobe power source section. The initial current at the start of charging is 90A,
It drops to about 50A in about 0.5 seconds, and then drops slightly
Charging is completed in 4.9 seconds. Therefore, if you start energizing 8 charging devices at the same time, 720 A
It requires a large current, but instead of energizing eight units at the same time,
For example, if you start by shifting each 0.7 seconds, as shown in Fig. 2,
The maximum current is 390 A, and the charging of all the machines can be completed in less than 10 seconds, so the current has decreased to less than half and the charging time has increased in less than 5 seconds compared to when charging all the machines at the same time. , Leakage of the previously charged power supply can be ignored. The reason for setting the time lag to 0.7 seconds is to have a margin in order to avoid the effects of variations. If you want to shorten the charging time even if the current increases a little because the power supply has a margin, as shown in Fig. 3, start charging five units first, two units after 0.7 seconds, and the last one after 0.7 seconds. When you start charging the platform, the maximum current reaches 450 A, but charging can be completed in 6.3 seconds, so the charging time only needs to increase by 1.4 seconds. In the latter half of charging, the current drops slightly as shown in Fig. 4,
The fall is not shown in FIGS. 2 and 3.

[0096]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory block diagram of an embodiment in which eight large strobes are used according to the charging method of the present invention.
The eight strobe light emitting units are connected to the eight strobe power source units, respectively, and 100 V power is supplied to the strobe power source unit on one side directly and on the other side through a relay of a control device. The eight relays operate sequentially one by one or in combination according to a preset time lag, and energize the strobe power supply unit. The general strobe power supply unit starts charging automatically when the light emission ends, but in the case of this device, when the sensor detects light emission, it releases all relays and sequentially charges again according to the preset time lag. To start. The method for providing the time lag can be arbitrarily selected from known methods, whether electric or mechanical. In addition, a current sensor is provided on the supply side of the strobe power source, regardless of the centralized control device.
The initial peak current drop may be sensed and the energization of the next strobe power supply unit may be started.

[0097]

According to the charging method of the present invention, the initial current is 90A.
In the case of using the eight strobes, the following is a great effect that the current can be greatly reduced and the increase of the charging time is small. Maximum current Charging time Simultaneous charging 720A 4.9 seconds Method of FIG. 2 of the invention 390A 9.8 seconds Method of FIG. 3 of the invention 450A 6.1 seconds

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a charging current graph in which charging start times of eight strobes are shifted by 0.7 seconds.

FIG. 3 is a diagram showing a short-time charging current graph of eight strobes.

FIG. 4 is a diagram showing a charging current graph of one strobe.

Claims (1)

[Claims] 1. In strobe charging of a copying printer having a large number of strobes, energization to each strobe power source is automatically performed according to a preset time lag, and energization to each strobe power source is automatically set to a preset time lag. A method for charging a strobe light source for a copying printer, characterized by sequentially starting according to.