JPS583790Y2 - Paper feeding device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paper feeding device for a copying machine or the like.

Recently, a double cassette type paper feeding mechanism has been widely adopted in copying machines and the like.

This method requires means for selecting which cassette to feed paper from, but the conventional method is
- A method of selecting a cassette using an electric signal as seen in Publication No. 10142 or Utility Model Application No. 50-10244
This is based on a lever switching system as shown in the publication.

However, the former requires two motors or two clutches for one motor, increasing costs, while the latter requires the lever position to be reversed when loading/unloading the cassette and when selecting the cassette. It is easy to change the lever, and at the same time, it requires force to switch the lever, so it has poor operability.

This invention was developed in view of these points, and aims to provide a paper feeding device that can select a paper storage section using one motor and simple mechanical parts, thereby reducing costs. That is.

With this idea, we installed a one-way crack fik that transmits rotational force only in the paper feeding direction to the paper feeding rollers of the two paper storage sections on the east side.
A motor is connected to the one-way clutch of one paper feed roller, and a motor is connected to the one-way clutch of the other paper feed roller via a rotational force reversal body, so that when the motor is rotated in the forward direction and when it is rotated in the reverse direction. It is possible to selectively drive one paper feed roller at a time, and by adding a one-way clutch, adding a rotation direction reversing body, and making the motor capable of forward and reverse rotation, the paper feed roller can be selectively driven. The rollers can be selectively driven and the structure is extremely simple.

An embodiment of this invention will be explained based on the drawings.

As shown in FIG. 1, a registration roller 1 that operates at a predetermined timing is usually provided in a paper feeding section, and a guide plate 2 including upper and lower partition plates is provided near the registration roller 1.

Paper feed cassettes 3 and 4, which serve as two paper storage sections, are inserted into the housing facing this guide plate 2.

These paper feed cassettes 3 and 4 each store paper 5 of different sizes (for example, one is A4. and the other is A84), and separation claws 6 are provided at the front corners.

Inside the casing, there are provided a pressure plate 6a on which the paper 5 is placed and a spring T for pushing them up.

The uppermost paper 5 is placed in the paper feed cassettes 3 and 4.
A paper feed roller 8 that comes into contact with and feeds this paper 5 one by one.
, 9 are provided.

Shafts 10 and 11 of these paper feed rollers 8 and 9 are held in bearings 13 of a machine frame 12, and one-way clutches 14 and 15 are respectively attached to one end of the shafts.

This one-way clutch 14, 15 is connected to the shaft 10.11.
is restrained when it is rotated in the direction in which the paper 5 is fed, and becomes free when it is reversed.

Gears 16 and 17 are fitted to the outer ring portions of these one-way clutches 14 and 15.

Further, this gear 16 is meshed with a drive gear 20 connected to a motor 19 which is directly capable of forward and reverse rotation, and the other gear 17 is meshed through an idle gear 18 as a rotation direction reversal body.

here. The motor 19 is a DC motor, and its forward/reverse rotation control circuit is constructed as shown in FIG.

That is, the motor 19 is connected to a fixed terminal C of a two-pole relay 23 having switching terminals a and b, respectively, and equipped with movable contacts 21 and 22. The switching terminal Suga is connected to the +Ev terminal.

The remaining switching terminals S and A are connected to the collector side of the transistor 24 to which the paper feed command signal is inputted to the base side.

The movable contacts 2i, 2 are connected to the +Ev terminal.
A coil 25 for switching the transistor 2 to the switching terminal side is connected to the collector side of the transistor 26.

The base side of this transistor 26 is connected to the paper feed cassette 3.
A cassette selection signal for selecting the side is input.

In such a configuration, it is assumed that the paper 5 is now fed from the paper feed cassette 4.

In which case, the cassette selection signal is not input, so the transistor 26 does not operate and the movable contacts 21 and 22 are switched to the switching terminal a.
It's on the side.

Therefore, when the paper feed command signal is input, the transistor 24
operates, and as a result, the motor 19 is connected to the +Ev terminal, the movable contact 22, the motor 19° movable contact 21. transistor 24
The current flowing into the direction begins to reverse the direction.

That is, in FIG. 3, the drive gear 20 rotates counterclockwise, which causes the gear 1T to rotate forward.

At this time, the one-way clutch 15 is locked and the gear 17
The normal rotation is transmitted to the shaft 11 to rotate the paper feed roller 9.

As a result, the paper 5 is fed from the paper feed cassette 4.

On the other hand, when the drive gear 20 is reversed, the gear 16 is reversed via the idle gear 18, but since the one-way clutch 14 is in a free state, the rotation of the gear 16 is idle and the paper feed roller 8 is not operated.

At the same time, when feeding the paper 5 from the paper feed cassette 3, a cassette selection signal is input.

As a result, the transistor 26 operates, the coil 25 is energized, and the movable contacts 21 and 22 are switched to the switching terminal side.

Therefore, when a paper feed command signal is input, the transistor 24 operates, and the motor 19 connects the +Ev terminal to the movable contact 21.
．． The current flowing through the motor 19, the movable contact 22, and the transistor 24 causes it to start rotating in the normal direction.

That is, the drive gear 20 rotates normally, causing the gear 16 to rotate normally via the idle gear 18.

This time, the one-way clutch 14 is locked, so shift to gear 1.
The normal rotation of the paper feed roller 8 is transmitted to the shaft 10, causing the paper feed roller 8 to rotate.

As a result, the paper 5 is fed from the paper feed cassette 3.

On the other hand, although gear 17 is reversed, one-way clutch 1
5 is in a free state, the paper feed roller 9 does not operate.

In this way, paper feeding from the paper feeding cassettes 3 and 4 can be selected simply by rotating the motor 19 in the forward or reverse direction, and these can be controlled by one motor 19 and the one-way clutch 1.
It can be constructed with simple mechanical parts such as 4.15, and the cost can be reduced.

In addition, as a result of installing the one-way clutch 14.15,
The paper feeding rollers 3 and 4 are not subject to frictional load during conveyance of the paper 5 after the motor 19 is turned off.

In addition, the paper storage section in this invention is not limited to the cassette type using the paper feed cassettes 3 and 4 as shown in the embodiment.

As mentioned above, this device is connected to a motor that can rotate forward or backward through a one-way clutch mounted on the shaft of the paper feed roller, so the paper storage section can be selected by simply rotating the motor forward or reverse. It can feed paper, can be configured with simple mechanical parts such as a single motor and a one-way clutch, and has effects such as cost reduction.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, with Fig. 1 being a side view, Fig. 2 being a front view, and Fig. 3 being a side view showing power transmission.
FIG. 4 is a circuit diagram. 3-4...Paper feed cassette (paper storage section), 5...
... Paper, 8-9 ... Paper feed roller, 10-1
1... Shaft, 14-15... One-way clutch, 18... Idle gear (rotation direction reversal body), 19... Motor.

Claims (1)

[Scope of utility model registration request] There are two paper storage sections in which paper is stored, each equipped with a paper feed roller, and a motor capable of forward and reverse rotation, and a one-way clutch is provided on the axis of each of the paper feed rollers to transmit rotational force only in the paper feeding direction. A paper feeding device, wherein the motor is connected to a one-way clutch of one of the paper feeding rollers, and the motor is coupled to a one-way clutch of the other paper feeding roller with a rotation direction reversal member interposed therebetween. .