JPS62146849A - Current limiting device for conveying motor in sorter - Google Patents

Abstract

PURPOSE:To prevent a paper conveying motor in a sorter from being overloaded due to a difference in paper conveying speed between a copying machine and the sorter, and to prevent a conveying roller from being worn, by using a d.c. motor as the paper conveying motor in the sorter, and by providing a current limiting circuit in the power source circuit. CONSTITUTION:A paper conveying motor in a sorter is a d.c. motor 10 whose power source circuit has a current limiting circuit 11 in which the voltage at both ends of a resistor R1 increases when the value of current exceeds a set value, and if it exceeds 0.7V, a transistor Q1 is energized to restrain the corrector current of a transistor Q2. If the current value is below the set value, the voltage at both ends of the resistor R1 is low, and therefore, the transistor Q1 is not energized. Accordingly, the value of current running through the motor is made to the lower than a predetermined value. With this arrangement, it is possible to eliminate overload and over-current, and therefore, the life of the motor may be prolonged. Further, there is no slip in conveyance, and therefore abrasion of a conveying roller is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transport motor current limiting device for a sorter.

Conventional technology 2＼-- Conventionally, sorters have operated at a faster speed than the copying machine's paper transport speed in order to prevent the paper transported from the copying machine from sagging and to ensure that the paper is properly ejected into the sorter's tray. It transports paper.

Problems to be solved by the invention Due to the difference in paper conveyance speed between the copying machine and the sorter,
The sorter's paper transport motor is overloaded. Also, at this time, the paper conveyance roller is slipping.

This has caused problems such as a short motor life and rapid roller wear. Therefore, regular maintenance is required, and the motor and rollers need to be replaced.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a sorter paper conveyance motor that has a long motor and roller life and requires no maintenance.

Means for Solving the Problems In order to solve the above problems, the present invention employs a three-page configuration in which a DC motor is used as the paper transport motor of the sorter, and a current limiting circuit is attached to the power supply circuit of the DC motor. It is prepared.

Function The present invention controls the current of the paper transport motor with the above-described configuration, thereby controlling the torque and rotation speed of the motor, reducing overload on the motor and rollers, extending the life of the motor and rollers, and making maintenance easier. This eliminates the need for

Embodiment A sorter according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a drive circuit for a paper conveyance motor of a sorter in an embodiment of the present invention. In Figure 1,
10 is a DC motor (paper transport motor), and 11 is a current limiting circuit. In this circuit, when the current value exceeds a set value, the voltage across the resistor R1 increases, and when the current value exceeds 0.7V, the transistor Q1 operates to suppress the collector current of the transistor Q2. If the voltage is below the set value, the voltage across the resistor R1 becomes low and the transistor Q1 does not operate. This is a circuit that keeps the current flowing through the motor below a certain level. When this circuit is connected to a motor, the rotation speed-torque characteristics of the motor will be as shown by the solid color line in FIG. 2. The person can set the torque,
B is the required number of rotations (speed). The dotted line indicates the characteristics when no current limiting circuit is attached. Further, the set torque can be freely set within the allowable torque of the motor by changing the value of the resistor R1.

Next, FIG. 3 shows the parts 1f and 1 between the sorter and the copying machine main body, where 3o is the copying machine, 31 is a fixing roller, 32 is a paper ejection roller, 33 is a sorter, 34 is a tray, 35 36 is a paper feed roller, 36 is a paper discharge roller, 37 is a paper feed sensor, 38 is a paper discharge sensor, and 39 is a DC motor (paper transport motor).

To explain the operation, paper is conveyed from the copying machine, passes through the fixing roller 31 and the paper ejection roller 32, and is supplied to the sorter 33. The paper feed sensor 37 turns on the paper. The paper feed roller 35 and paper ejection roller 36 rotate. Paper is conveyed to the tray by the paper feed roller 35 and the paper discharge roller 36. When the paper is conveyed, the tray 34 of the sorter 6 page moves up one stage and waits for the next paper to arrive. The paper conveyance speed of the sorter at this time is as shown in FIG. When the edge of the paper is in the copying machine 30, the paper is strongly pressed against the fixing roller 31 of the copying machine 3o, so that it is transported at the speed of the copying machine 3o.

When the paper completely leaves the copying machine 3o, it is transported at the speed of the sorter 33. When this paper is being held down by the copying machine 3o, if the current control or torque control of the paper transport motor 10 is not performed properly, roller slipping and motor overload will occur. The motor rotation waveform at this time is shown by the dotted line in FIG. When a current limiting circuit is installed, the motor torque becomes as shown by the solid line a in Figure 5, so when there is paper in the copying machine 3o, the conveyance torque of the sorter 33 is suppressed by humans, and the rotation becomes equal to the rotation of the copying machine 3o. , the slippage of the rollers is suppressed. In other words, the rotational waveform becomes as shown by the solid line a in FIG.

Effects of the Invention As described above, the present invention provides a current limiting circuit in the power supply circuit of the DC motor of the sorter 0 paper transport motor, thereby eliminating overload and overcurrent applied to the motor. Motor life is extended. Second, there is no roller slippage, which reduces roller wear. These eliminate the need for motor replacement and roller replacement.Furthermore, by changing the resistance value of the resistor R1, the torque of the paper transport motor can be set to suit the sorter and copying machine.

[Brief explanation of drawings]

FIG. 1 is a motor drive circuit diagram in an embodiment of the present invention,
FIG. 2 is a rotation speed vs. torque characteristic diagram of a paper conveyance motor in an embodiment of the present invention, FIG. 3 is a configuration diagram of a copying machine and a sorter in an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a time chart of the paper speed of the sorter in the example, and FIG. 5 is a time chart of the rotation speed of the paper conveyance motor in the embodiment of the present invention. 10...DC motor (paper transport motor), 11.
...Current limiting circuit, 3o...Copy machine, 3
1...Fixing roller, 32...Paper output roller, 33...Saw-7 pager, 34...Tray, 35...Paper feed Roller, 36... Paper ejection roller, 37...
... Paper feed sensor, 38 ... Paper discharge sensor, 39
...DC motor (paper transport motor). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (1)

[Claims] comprising a paper transport means for receiving copy paper ejected from a paper ejection means of a copying machine and transporting the copy paper onto a bin of a sorter at a higher speed than the ejection speed; and a DC motor for driving the paper transport means; A current limiting circuit is provided in the power supply circuit of the DC motor, and when the same paper is present in both the paper ejection means and the paper transport means, the DC motor is configured to reduce the paper transport speed to the paper ejection speed of the paper ejection means. A transport motor current limiting device for a sorter, characterized in that a constant of the current limiting circuit is set to limit the current flowing to the sorter.