JPH0611974Y2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sheet feeding device, and more particularly, to a sheet feeding roller configured to be slidable with respect to a drive shaft so that a sheet tray is fed when the sheet tray is pulled out. The present invention relates to a sheet feeding device configured to prevent a roller from sliding on a sheet.

(Prior Art) In a conventionally used paper feeding device, a paper feeding roller 5 having a structure as shown in FIG. 3 is fixed to a drive shaft 6 to be used. .

Then, the paper 3 accommodated in a device such as a paper tray is taken out one by one by the rotation of the paper feed roller 5, and is conveyed toward a toner image transfer portion or the like.

(Problems to be solved by the invention) In the conventional paper feeding device as described above, a paper tray or the like is inserted into a side portion of the copying machine to move the paper feeding direction of the copying machine. In the case of using a device having a structure in which the paper is brought into contact with the paper feed roller, even if the paper feed roller having the structure shown in FIG. 3 is used,
There is no adverse effect on the paper when the paper tray is pulled out.

However, recently, it has been widely used,
In a paper feeding device of the type in which a paper tray or the like is inserted into or removed from the front of a copying machine, when the paper tray or the like is pulled out, the moving direction A of the paper 3 and the rotation direction B of the paper feeding roller are set at right angles. Therefore, even if the drive shaft 6 is set in a free state, the paper 3 may slide on the surface of the paper feed roller 5, causing wrinkles on the paper or damaging the paper. .

In order to eliminate such a defect, some devices are provided with a mechanism for releasing the contact pressure (normal force) with respect to the paper feed roller when the paper tray is inserted / removed, but the normal force release mechanism is provided with a lever or the like. It is necessary to swing the lever and then perform the operation of pulling out the paper tray.

That is, when such a lever is provided, it is necessary to perform a two-action operation when the paper tray is inserted or removed, which imposes an extra burden on the operator.

If the operator does not operate the lever, the paper is naturally slid while being in contact with the paper feed roller, and the paper is left in the paper feeder or <damaged or the like. Occurs.

Further, in a relatively large-sized copying machine, an elevator type paper feed tray may be used in order to be able to obtain a large number of copies. In the case of pulling out, the drive motor is operated to lower the paper tray, and the paper feed roller is set to be separated from the paper, and then the paper tray can be moved. However, when such a configuration is used, the mechanism of the sheet feeding device becomes complicated, the manufacturing cost of the sheet feeding device rises, and its control is difficult.

In addition, a copying machine having a structure in which the paper feed roller and the paper tray are integrally drawn may be used. In the apparatus having such a configuration, since the paper feed roller is integrally provided in the paper tray, there is a drawback that the paper feed roller becomes an obstacle when replenishing paper,
Further, since the movable part is exposed, there is a drawback that the operator is easily injured.

(Object of the Invention) The present invention solves the above-mentioned drawbacks of the conventionally used sheet feeding device. When the sheet tray is pulled out, the sheet feeding roller is moved together with the sheet tray. However, it is an object of the present invention to provide a device capable of returning the paper feed roller after the normal force is released and preventing damage to the paper.

(Means and Actions for Solving Problems) According to the present invention, a paper tray is attached to a paper feed unit of a copying machine or the like, and a mechanism for feeding the paper stored in the paper tray by a paper feed roller is provided. The paper tray attached to the paper feed unit relates to a device configured to be attachable to and detachable from the paper feed unit in the drive axis direction of the paper feed roller. In the present invention, the roller holder 10 and the paper feed roller 5 are integrally slidable with respect to the drive shaft of the paper feed roller, and the roller holder 10 is provided with an elastic member 11 with respect to the paper feed unit main body. The paper tray 1 is provided with means for positioning the paper feed roller, and the locking means is provided on one of the roller holder 10 and the paper tray 1 and the engaged means is provided on the other member. In a state in which the locking means is engaged with the locked means and the paper tray is pulled out by the operation of pulling out the paper tray, Means for moving the paper feed roller together with the roller holder by the distance between the sliding portions provided on the drive shaft of the paper feed roller are provided.

In the paper feeding device of the present invention, when the paper tray or the like is pulled out, the paper feeding roller is moved by a predetermined distance while being in contact with the paper. However, the sheet is prevented from sliding on the sheet, and the sheet can be prevented from being damaged.

Further, in the paper feeding device of the present invention, when the paper tray is pulled out, it is not necessary to use an operating member such as a lever, and an extra burden is not imposed on the operator.

(Embodiment) The construction of the paper feeding device of the present invention will be described with reference to the illustrated embodiment.

As shown in FIG. 1, the paper tray 1 of the present invention includes:
The lock groove 2 is formed on the side portion thereof, and the lock claw 13 of the roller holder 10 is engaged with the lock groove 2 as described later.

The paper feeding unit of the copying machine of the present invention is provided with a drive shaft 6 for driving the paper feeding roller 5, and the drive shaft 6 has a sliding portion 7
The paper feed roller 5 can be slid through the drive shaft 6, and a locking portion 8 is provided at a predetermined portion of the drive shaft 6 when the paper feed roller 5 is slid. Restrict the edges.

Further, the paper feed roller 5 of the present invention is configured to be slidable on the drive shaft 6 as described above.
It is held by the roller holder 10. The roller holder 10 is connected to a frame of a copying machine via a spring 11 and is configured to be movable along a drive shaft 6. In addition to a member that holds both sides of a paper feed roller, a bracket is attached to an end of the roller holder 10. A lock claw 13 is slidably provided via 12. In the case of the illustrated embodiment, the lock claw 13 is biased counterclockwise by the spring 14 so as to be locked in the lock groove 2 of the paper tray 1.

The state shown in FIG. 1 shows a stage before the paper tray 1 is inserted and set at the paper feed position. In this state, the paper feed roller 5 is moved to the paper feed position together with the roller holder 10. It has been stopped.

In this state, when the paper tray 1 is inserted, the normal force applying device (not shown) is operated at the predetermined insertion position to swing the paper 3 upward, and thereby the normal force is applied. The paper feed roller 5 is set in a state of being pressed against the paper 3 by a predetermined pressing force, and the paper feeding operation is performed.

Further, at the final stage of the insertion of the paper tray 1, the lock claw 13 abutting on the frame of the paper tray is swung, and the force of the spring 14 locks the tip of the claw in the lock groove 2. .

Next, the operation of pulling out the paper tray of the present invention from the paper feed section will be described.

The state shown in FIG. 2 shows a state in which the paper tray 1 can be set to a fixed position and a paper feeding operation can be performed. When copying is completed and the paper tray is to be replaced, the paper tray 1 can be replaced. Is moved in a direction perpendicular to the front side of the copying machine, that is, the rotation direction of the paper feed roller 5.

When the paper tray 1 is pulled out, the roller holder 10 is integrally moved to the paper tray 1 via the lock claw 13 engaged with the lock groove 2, and in the state as it is, the arrow mark The paper tray 1 and the paper feed roller 5 are moved in the B direction.

Then, when both members are moved integrally by a predetermined distance, the paper feed roller 5 abuts on the locking portion 8 provided at the end of the sliding portion 7 of the drive shaft 6 and is stopped. The normal force by the push-up member from the lower portion of the sheet 3 is released. Therefore, the movement of the paper feed roller 5 is stopped while the pressure between the paper 3 and the paper feed roller 5 is released.

After that, when the paper tray 1 is still moved in the direction of the arrow B, the lock claw 13 slips out of the lock groove 2, and the roller holder 10 is returned to its original position by the force of the spring 11, as shown in FIG. Returned to the position shown.

Further, in the above embodiment of the present invention, an example in which the paper is fed while the paper is accommodated in the paper tray is shown.
In a device that uses a paper feed cassette to feed paper, a member such as a snubber claw is provided at the tip of the paper feed side of the paper feed cassette. I have to.

In such an apparatus, the sliding of the paper feed roller on the paper increases the degree to which the paper is damaged. On the other hand, since the paper feed roller is prevented from sliding in the right angle direction, the effect of the present invention can be exerted more effectively.

(Advantages of the Invention) Since the paper feeding device of the present invention has the above-described configuration, when the paper is moved in a direction perpendicular to the paper feeding direction, the uppermost paper is damaged. Is prevented and wasteful use of paper is eliminated.

Further, the paper feeding device of the present invention has a simple structure of the interlocking mechanism, the manufacturing cost thereof can be relatively low, and it is not necessary to provide a normal force releasing member such as a lever. It is possible to reduce the burden on the operator.

[Brief description of drawings]

FIG. 1 is a perspective view showing the construction of the paper feeding device of the present invention, FIG. 2 is an explanatory view showing the relationship of the main parts when the paper tray is set at the paper feeding position, and FIG. 3 is a conventional paper feeding device. FIG. 6 is an explanatory diagram showing a relationship between a sheet and a sheet feeding roller in the sheet device. Reference numerals in the figure 1 ... Paper tray, 2 ... Lock groove, 3 ... Paper, 5 ...
... Paper feed roller, 6 ... Drive shaft, 7 ... Sliding part, 8 ... Locking part, 10 ... Roller holder, 11 ... Spring,
12 ... Bracket, 13 ... Lock claw, 14 ... Spring.

Claims (1)

[Scope of utility model registration request] 1. A mechanism for attaching a paper tray to a paper feed unit of a copying machine and the like, and providing a mechanism for feeding the paper stored in the paper tray by a paper feed roller, wherein the paper tray attached to the paper feed unit is In a device configured to be attachable to and detachable from a paper feed unit in the drive shaft direction of the paper feed roller, a roller holder
And a paper feed roller 5 are slidably provided integrally, and a means for positioning the paper feed roller is provided by interposing an elastic member 11 for biasing the roller holder 10 in the insertion direction of the paper tray. Locking means is arranged on one of the roller holder 10 and the paper tray 1, and locked means is provided on the other member, and with the paper tray 1 mounted in the paper feed section, By engaging the locking means with the paper tray, and pulling out the paper tray, the paper feed roller is moved by the distance of the sliding portion provided on the drive shaft of the paper feed roller while the paper tray is kept in the engaged state. A sheet feeding device, characterized in that it is provided with means for moving the roller holder.