JPH01288533A - Paper feeding device - Google Patents

Abstract

PURPOSE:To develop the stable operation on the start of paper feed by installing a drive control system for acceleration-driving pulse motors. CONSTITUTION:When the paper feed operation is suspended, a driving circuit 30 stops pulse motors 14 and 21 through the switching to the 1-phase excitation system, immediately before the stop of the pulse motors 14 and 21 which are driven in the 2-phase excitation system or 1-2 phase excitation system. In restart, the pulse motors 14 and 21 are driven through the 1-phase excitation system, and after a certain number of revolution is realized, drive is performed through the switching to the 2-phase excitation system or 1-2 phase excitation system. While, on the next start, the pulse motors 14 and 21 are driven through the 2-phase excitation system or 1-2 phase excitation system, and stop is performed through the 1-phase excitation system immediately before engagement. The program corresponding to this driving system is memorized in the driving circuit 30.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a paper feeding device.

(Prior Art) Examples of paper feeding devices include those used in image forming apparatuses, such as electronic copying machines.

In order to store multiple sheets of paper and sequentially send out the stored sheets one by one, this comes into contact with a plurality of paper storage sections and the outermost layer of sheets stacked and stored in these paper storage sections. It is composed of a paper feeding member, for example, a paper feeding roller, a pulse motor that drives the paper feeding roller to sequentially feed out sheets one by one, and a drive control system that controls the driving of this pulse motor. However, in order to suppress the damping vibration of the conventional pulse motor for driving the paper feed roller, 1-2
It was driven using a phase excitation method or a two-phase excitation method.

Therefore, when the paper feeding operation of this device starts, or when paper feeding is completed and the pulse motor stops, the convex pole of the rotor is stopped between the S and N poles of the outer magnet, or the rotor stops. Occasionally, at the next restart, daytent torque causes the rotation direction to be opposite to the intended rotation direction, resulting in a problem in which paper is fed from multiple paper storage units at the same time, or if paper is not fed from any of the paper storage units. This caused problems such as paper not being printed.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and provides a paper feeding device that can exhibit stability in paper feeding operation, particularly stable operation at the start of paper feeding. The purpose is to provide

[Structure of the Invention] (Means for Solving the Problems) The paper feeding device of the present invention includes a paper storage section provided with a single sheet feeder member, and an outermost layer stacked and stored in the paper storage section. The drive control system is equipped with a paper feed member that comes into contact with the paper, a pulse motor that drives the paper feed member to sequentially feed out the paper sheets one by one, and a drive control system that accelerates and drives the pulse motor. When the motor is driven, it is driven using a two-phase excitation method or a 1-2 phase excitation method, and when the pulse motor is started, it is driven using a one-phase excitation method.

(for production) The operation of the apparatus having the above configuration will be explained below.

The drive control system of this device uses a two-phase excitation method or a one-phase excitation method when driving the pulse motor that performs paper feeding operation.
Since it is driven using a two-phase excitation method and a one-phase excitation method at the start, the rotation during driving of the pulse motor is stable, and the direction of the rotational torque is determined in a specific direction especially at the start, so the paper is always The paper feeding start operation becomes stable.

(Example) Hereinafter, an example of the paper feeding device of the present invention will be described with reference to the drawings.

The paper feed device (not shown in FIG. 1) includes a manual feed guide 1 for manually feeding paper, a first paper storage unit containing paper P, for example, a first paper feed cassette 2, and a second paper feed cassette 2 containing paper P. A storage unit, such as a second paper feed cassette 3, is removably arranged in the copying machine main body 4.

A feeding member, for example, a pair of rollers 5, 5, which feeds manually fed sheets, is disposed in the inner part of the manual feeding guide 1 in contact with the manual feeding guide 1. In addition, the first paper feed force cellars 1 to 2
A first paper feeding member, for example, a first paper feeding roller 6, which sequentially frictionally feeds out the uppermost layer of paper P stored in the paper P, is arranged so as to be able to rotate integrally with the shaft 6A. Also, the second
A second paper feed member, for example, a second paper feed roller 7, which sequentially frictionally feeds the uppermost sheet of paper P stored in the paper feed cassette 3 is arranged so as to be able to rotate integrally with the shaft 7A. Further, the manual feed roller 5. An alignment conveyance member that aligns and conveys the sheets fed by the first roller 6 or the second feed roller 7, for example, a pair of registration rollers 8
, 8 are arranged in contact with each other. In addition, each of the rollers 5, 6
．． 7 to the registration roller 8, paper guides 9a, 9b, and 9c are provided as shown in FIG.

Next, a drive system for the first paper feed roller 6 and the second paper feed roller 7 will be explained based on FIGS. 1 and 2. A first one-way clutch 1 is provided at one end of the shirts 1 to 6A.
A first drive gear 11 is attached via 0A. The first one-way clutch IOA is the first one-way clutch IOA.
Only the clockwise rotation of the drive gear 11 of the shaft 6
It is designed to be transmitted to A. In addition, the shaft] 7△m-5=A second one-way clutch 10B is connected to the end of the shaft.
The drive gear 12 is installed (pulled).

The second one-way clutch 10B controls only the clockwise rotation of the second drive gear 12 through the shaft 7.
It is designed to be transmitted to A.

The copying machine main body 4 is provided with a first pulse motor 14, and a pinion gear 15 is attached to the motor shaft of this pulse motor 14.

Two idle gears 16A are provided between this pinion gear 15 and the first drive gear 11.

16B, and one idle gear 16C is arranged between the pinion gear 15 and the second drive gear 12, and as shown in FIG. 3, the pinion gear 15 is rotated counterclockwise. Then, only the first paper feed roller 6 is rotated clockwise via the first one-way clutch 10A and the idle gears 16A and 16B. Further, when the pinion gear 15 is rotated clockwise, only the second paper feed roller 7 is rotated clockwise via the second one-way clutch 10B and the idle gear 16C.

Next, a drive system for the registration roller 8 and the manual feed roller 5 will be explained based on FIGS. 1 and 3.

A third one-way clutch 18A is attached to one end of the shaft 5A that rotates integrally with the lower manual feed roller 5 shown in the figure.
An idle pulley 19A is provided via. The third one-way clutch 18A is configured to transmit only the counterclockwise rotation of the idle pulley 19A to the shaft 5A. Further, a drive pulley 19B and an idle gear 2OA are provided at one end of the shirts 1 to 8A, which rotate integrally with the lower registration roller 8 shown in the figure, via a fourth one-way clutch 18B.

The drive pulley 19B is connected to the idle gear 2OA.
The fourth one-way clutch 18B is configured to rotate as a pair with the idle gear 2.
Only the counterclockwise rotation of the OA is transmitted to the shaft 8A.

And the idle pulley 19A and the drive pulley 19
A belt 22 is crossed between B, and a pinion gear 20B attached to the motor shaft of a second pulse motor 21 is meshed with the idle pulley 2OA, as shown in FIG. If the pinion gear 20B is rotated clockwise, both the one-way clutches 18A,
18B, only the lower registration roller 8 is driven counterclockwise, and when the pinion gear 20B is rotated counterclockwise, only the lower manual feed roller 5 is driven counterclockwise. ing.

Next, a drive control system for controlling the drive of the first and second pulse motors 14.21 will be described with reference to FIGS. 4 and 5. In general, a pulse motor operates by sequentially switching a direct current to each phase winding of a stator, thereby stepping the rotor one step at a time, and rotating at a step angle unique to the pulse motor. In order to drive such a pulse motor, as shown in Fig. 4, direct current is sequentially switched to flow through each phase winding of the stator of the pulse motor (such switching is hereinafter referred to as excitation phase switching). a drive circuit 30, a DC power supply 31 that inputs a voltage to be applied to the pulse motor to the drive circuit 30, and an oscillator 32 that manually supplies pulses to the drive circuit 30 to be used as a reference for switching the excitation phase. A drive control system 33 is configured by the first pulse motor 1 and
4 and the second pulse motor 21, the drive control system 33
are provided for each.

The drive circuit 30 stores, for example, a plurality of excitation phase switching times and excitation methods necessary to drive the pulse motor by a desired amount, counts clock pulses input from the oscillator 32, and selects a predetermined excitation phase. When the switching time is counted up, an excitation phase switching pulse is output to switch the excitation phase, and the excitation phase is sequentially switched from start to stop to drive the pulse motor by a desired amount. By changing the switching direction of the excitation phase, the forward and reverse rotation of the pulse motor rotor can be controlled.
In addition, by changing the excitation phase switching time, the output torque of the rotation speed can be controlled.

Next, the excitation method program stored in the drive circuit 30 will be described.

The 2-phase excitation method, in which current is constantly passed through two phases, or the 1-2 phase excitation method, in which one phase and two phases are alternately excited, has a small damping effect, so the pulse motor 14,
However, as mentioned above, there is a problem in that the pulse motors 14 and 21 rotate in the opposite direction to the expected rotation when starting or restarting the pulse motors 14 and 21 for the first time.

However, the one-phase excitation method, in which current flows in one phase all the time,
It is not suitable as a drive method for pulse motors used in a wide range of pulse rates because the damped vibration during stepping is large and tends to be out of order. However, when the pulse motor is in a stopped state or has stopped, the convex pole of the rotor , it does not stop between the S pole and the N pole of the outer magnet, but always faces the S pole or the N pole. Therefore, at the next start, rotation in the direction opposite to the planned rotational force direction will not occur due to Day 1 to torque.

In addition, when stopping the paper feeding operation, immediately before the pulse motors 14..21 driven by the two-phase excitation method or the 1-2 phase excitation method are stopped, The circuit 30 is changed to the one-phase excitation method and uses a pulse motor 1'1.
．． ．． 21 is stopped.

Then, at the next restart, the pulse motor 14.21 is driven using the 1-phase excitation method, and after reaching a certain number of rotations, the pulse motor 14.21 is changed to the 2-phase excitation method or the 1-2 phase excitation method. Alternatively, as shown in Fig. 5(B), the pulse motor 14゜21 is driven using the two-phase excitation method or the 1-2 phase excitation method at the next restart, and then stopped using the one-phase excitation method immediately before stopping. . A program corresponding to such a drive method is stored in the drive circuit 30.

Thus, when the pulse motor is stopped, the convex pole of the rotor is in a position opposite to the S or N pole of the outer magnet, so the pulse motor will rotate in the opposite direction to the planned rotation even when restarting the next time. will not occur.

Next, the operation of the paper feeding device will be explained.

When feeding paper from the first paper feeding cassette 2, by driving the first pulse motor 14 in the second counterclockwise direction in the figure, this rotation is caused by the idle gears 16A, 16B.
The signal is transmitted to the first drive gear 11 via the first one-way clutch 10A, and the paper feed roller 6 is rotationally driven in the third direction shown in the drawing.゛When feeding paper from the second paper feeding cassette 3, by driving the first pulse motor 14 clockwise in the third figure, this rotation is transferred to the second drive gear via the idle gear 16G. 12, and further, by the action of the second one-way clutch 10B, the second paper feed roller 7 is rotationally driven in the second clockwise direction in the figure.

In this manner, paper feeding from the first paper feeding cassette 2 or the second paper feeding cassette 3 can be selected by rotating the first pulse motor 14 in the forward and reverse directions.

In addition, when feeding paper that has been manually fed through the manual feed guide 1, by driving the second pulse motor 21 in the third counterclockwise direction in the figure, this rotation is caused to flow through the belt 22. This is transmitted to the idle pulley 19A, and roughly by the action of the third one-way clutch 18A, the manual feed roller 5 on the lower side in the third figure is rotationally driven in the counterclockwise direction in the third figure.

In addition, when the paper fed from the first paper cassette 2 or the second paper cassette 3 or the paper manually fed is transported by the register (~roller 8), the second pulse By driving the motor 21 clockwise in the third figure, this rotation is transmitted to the idle gear 2OA, and further, by the action of the fourth one-way clutch 18B, the registration roller 8 on the lower side in the third figure is rotated counterclockwise in the third figure. rotationally driven in the direction.

In this way, driving of the registration roller 8 or driving of the manual feed roller 5 can be selected by rotating the second pulse motor 21 in the forward and reverse directions. At this point, the pulse motor is
It will be driven by either flowchart A) or (B).

It should be noted that the above embodiment is an example, and it goes without saying that each member may be replaced with another member having the same function.

[Effects of the Invention] As is clear from the above description, according to the paper feeding device of the present invention, with the above configuration, the stable rotation of the pulse motor stabilizes the paper feeding operation, and the paper feeding operation is stabilized, especially at the start of paper feeding. It is possible to provide a paper feeding device whose operation can always be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the paper feeding device of the present invention;
Fig. 2 is an explanatory diagram showing the drive system of the first paper feeding member and the second paper feeding member in the paper feeding device shown in Fig. 1;
An explanatory diagram showing the drive system of the sending member and alignment conveyance member in the paper feeding device shown in the figure, FIG. 4 is a block diagram showing the drive control system of the pulse motor, and FIGS. 5 (A) and (B) are the respective driving systems. This is a flowchart of the excitation method stored in the circuit. 2... First paper storage section, 3... Second paper storage section, 6... First paper feeding member, 7... Second paper feeding member, 14... First pulse motor, 33... drive control system. Procedural amendment (method) May 25, 1989 Patent Application No. 329954 of 1986 2, Name of the invention Paper feeding device 3, Relationship with the case of the person making the amendment Patent applicant address Saiwai-ku, Yozaki City, Kanagawa Prefecture Horiyomachi 72 name (3
07) Toshiba Corporation Representative Shu Aoi - 4, Agent 6, Subject of amendment Drawings

Claims (1)

[Claims] A paper storage unit equipped with a single-sheet feeder, a paper feed member that comes into contact with the outermost layer of sheets stacked and stored in the paper storage unit, and a paper feed member that is driven to sequentially feed the sheets of paper. It is equipped with a pulse motor that sends out one sheet at a time and a drive control system that accelerates and drives this pulse motor. When driving the pulse motor, the drive control system drives the pulse motor using a two-phase excitation method or a 1-2 phase excitation method. A paper feeding device characterized in that the motor is driven using a one-phase excitation method when starting.