JPH0522533Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a paper reversing device used for reversing single-sided copy paper in devices such as automatic duplex copying machines, and in particular, the present invention relates to a paper reversing device used for reversing single-sided copied paper in devices such as automatic duplex copying machines. The present invention relates to a device configured to be able to perform feeding by utilizing the force generated during feeding.

(Prior Art) Conventionally, in automatic duplex copying machines, a sheet of paper that has been copied on one side is reversed in the middle of its paper conveyance path, stored in an intermediate restroom, and then sent out again toward the toner image transfer area. There are often

In such a device, an invert shot having a configuration as shown in FIG. 4 or 5 is generally used. In this invert chute 1, for example, as shown in FIG. It is placed. A three-roller device 5 connected to the paper conveyance path 10
Invert the paper through the inlet 6 of the
The material is introduced into the chute 1 and passed between the rollers of the corrugation roller device 4.

The corrugation roller device applies an action of curving the paper in a wavy manner in the width direction of the paper,
The paper is driven in the direction in which the paper is sent out from the chute 1 while providing rigidity in the longitudinal direction of the paper. When the paper enters the chute and the feeding action by the three roller device is completed, the paper is sent out toward the outlet 7 by the action of the corrugation roller device.

In addition, in the device shown in FIG.
and. Then, the end of the paper introduced from the inlet 6 of the three-roller device 5 contacts the pressing plate 3a and compresses the spring 3, and when the paper feeding action is completed, the repulsive force of the spring 3 is utilized. Then, the paper is sent out toward the exit 7.

(Problems to be Solved by the Invention) However, in the conventional apparatus as described above, for example, in the apparatus shown in FIG. If the conveying force of the corrugation roller changes and the amount of corrugation is large, thin paper will buckle, while on the other hand, if the amount of corrugation is small or thick paper, there will be a reversal effect. There are disadvantages such as not being carried out. Therefore,
It is difficult to fully demonstrate a stable reversing function for various types of paper.

Separately, in the device shown in Figure 5, since the distance to press the spring differs depending on the paper size, the reaction force of the spring naturally differs, and it is difficult to handle paper of various sizes. Therefore, it is difficult to exhibit stable reversal ability.

For example, when considering the strength of a spring,
If the reaction force is large, it will cause buckling for large-sized paper, and if the reaction force is small, it will not be able to perform a sufficient reversal action for small-sized paper or thick paper. Sometimes there isn't.

(Purpose of the invention) The present invention is intended to eliminate the drawbacks of the conventionally used devices as described above. It is an object of the present invention to provide a paper reversing device that is provided in the chute and can exhibit reversing ability in a stable state in response to various paper sizes and paper types.

(Means and operations for solving the problem) The paper reversing device of the present invention has a three-roller type reversing device that shares the input and output drive rollers at the entrance of the invert chute, and the paper reversing device of the present invention The present invention relates to a reversing device that provides guidance.

In the present invention, a reversing roller device is provided inside the invert chute, and one roller of the reversing roller device is configured as a free roller,
The other roller is constituted by a roller member supported by a coil spring, and both ends of the coil spring are connected to the roller and the support member to constitute a supported roller.

When the paper is inserted into the invert chute, the rotation of the supported roller in contact with the paper is accumulated as a reaction force in the coil spring, and the force accumulated in the coil spring is used to move the paper to the exit of the three rollers. It constitutes a mechanism that exerts the action of sending it out towards.

Therefore, in the paper reversing device of the present invention, the force applied to the coil spring provided on the supported roller when inserting the paper is used to
When the paper is reversed and ejected, the paper can be automatically sent out toward the outlet of the chute.

(Embodiment) The configuration of the paper reversing device of the present invention will be described according to the illustrated embodiment.

As shown in FIG. 1, the invert chute 1 of the present invention is provided with a three-roller device 5 at its insertion opening. The three-roller device 5 is composed of a drive roller 5a in the center and rollers 5b and 5c arranged on both sides of the drive roller 5a.The rollers 5a and 5b form an entrance 6 for guiding the paper to the chute. Then, by rollers 5a and 5c,
It constitutes an outlet 7 that inverts and sends out the paper from the chute.

A drive roller 5a is provided so as to be constantly driven in the counterclockwise direction as shown in the figure, and the paper is inserted in the insertion direction via a nipping section formed by rollers 5b and 5c that are in contact with both sides of the drive roller 5a. It is designed so that it can be transported in the discharge direction.

Further, in the paper conveyance labyrinth in the front and rear portions of the invert chute 1, there are a conveyance device constituted of a conveyance roller 11 and a pinch roller 12, and a conveyance device constituted of a conveyance roller 11a and a pinch roller 12a, respectively. The paper P is transported in a predetermined direction.

A reversing roller device 1 consisting of a pair of free rollers 16 and a supported roller 20 is located near the entrance of the invert chute 1 of the present invention.
5 is provided. The reversing roller device 15
As shown in FIG. 2, the guide plates 2 and 2a
It is composed of a free roller 16 and a supported roller 20, which are respectively provided in correspondence with the above. The free roller 16 has its shaft 17 supported by a bracket 18 of the guide plate 2, and the roller 1
6 is provided so that it can be rotated in any direction.

The supported roller 20 also has a spring 2 attached to a shaft 21 protruding on both sides of the roller.
2 and 22a are respectively attached, and the other ends of these springs are attached to support cores 23 and 23a fixed to the guide plate 2a.

When a sheet of paper is inserted between the rollers 16 and 20, the reversing roller device 15 is rotated by the sheet fed by the roller device at the entrance, but at that time, the supported roller By rotating the roller 20 in the clockwise direction shown in FIG. 1, force is accumulated in the springs 22, 22a of the biasing member attached to the shaft 21 of the roller 20.

In other words, in this case, since the other end of the spring is fixed to the support core 23,
The rotation of the roller 20 causes the spring to further wind in the winding direction or the opposite direction.

Therefore, when the feeding of the paper by the roller at the inlet 6 is completed and the feeding force by the roller at the inlet 6 is no longer applied to the roller 20 through the paper, the spring 2 of the supported roller 20
2, 22a causes the roller 20 to move to the first
It acts to rotate in a direction opposite to that shown in the figure, ie, in a counterclockwise direction.

The counterclockwise rotation of the supported roller 20 acts as a force to transport the paper P held between both rollers of the reversing roller device 15 toward the exit 7. Therefore, the edge of the paper is moved along the roller 5a rotating counterclockwise.
The paper is moved toward the exit 7 of the three-roller device, is sandwiched between two rollers disposed at the exit 7, and is sent out toward the sandwiched portion between the transport roller 11a and the pinch roller 12a of the paper transport path. Become.

Further, in the paper reversing device of the present invention, it is also possible to use a supported roller 25 having a configuration as shown in FIG. 3 as the reversing roller device 15. In the embodiment shown in FIG. 3, the hollow portion 26 is used as the supported roller 25.
A roller with a

Then, springs 27 and 27a are inserted into the hollow part 26 of this roller, and the ends thereof are fixed to the roller body, and the other ends of the springs are fixed to the studs 28 and 2.
Fix it to 8a. These studs 28, 28a are
It is attached to brackets 29, 29a provided on the guide plate 2a, and the supported roller 2 is supported by a spring wrapped around the stud.
I support 5. And roller 25 with support
The pressing force on the free roller 16 can be adjusted by the spring.

As described above, in the paper reversing device of the present invention, the reversing roller device 15 provided in the invert chute 1 acts as a guide when inserting the paper into the invert chute, and The rotation of the supported roller when inserting the paper is stored in a spring as a biasing member, and the force of the spring can be used as a force when sending the paper out from the invert chute. .

Further, in the above embodiment of the present invention, an example is shown in which a coil spring is used as the biasing member, but the biasing member is not limited to a spring. It is also possible to use other components that perform the same function.

Furthermore, in the illustrated embodiment, the free roller 16 is shown as a member having a structure that does not exert a pressing action on the paper.
In addition, it is also possible to have the bracket support the shaft of the free roller 16 via a member such as a leaf spring so that it is biased against the supported roller.

(Effects of the invention) Since the paper reversing device of the present invention has the above-described configuration, the difference in conveying force depending on paper size and paper quality is reduced, so it can achieve stable reversing performance for various types of paper. It becomes possible to demonstrate.

In addition, in the paper reversing device of the present invention, the force applied to the coil spring provided on the supported roller when inserting the paper is used to feed the paper toward the outlet of the chute when the paper is reversed and ejected. It becomes possible to perform the functions automatically.

Furthermore, when the paper reversing device of the present invention is used for reversing sheets that have already been copied on one side in an automatic duplex copying machine, the reversing performance can be greatly improved compared to the conventionally used invert chute. This results in an apparatus that does not jam paper or damage paper.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an invert shoot part in an automatic double-sided copying machine, FIG. 2 is a sectional view showing the configuration of the reversing roller device of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. The sectional view, FIG. 4, and FIG. 5 are explanatory views showing the configuration of a conventional invert chute, respectively. Symbols in the diagram: 1...invert shoot, 2...
...Guide plate, 3...Spring, 4...Corrugation roller device, 5...3 roller device, 6...
Entrance, 7...Exit, 10...Paper transport path, 11...
...Transport roller, 12...Pinch roller, 15...
Reversing roller device, 16... Free roller, 17...
... shaft, 18 ... bracket, 20 ... roller with support, 21 ... roller shaft, 22 ... spring, 23 ... support core, 25 ... roller with support, 26 ... hollow part, 27 ... spring, 28...Stud, 29...Bracket.

Claims (1)

[Scope of Claim for Utility Model Registration] A reversing device in which a three-roller type reversing device having a common input and output drive roller is disposed at the entrance of the invert chute to guide paper, comprising: A reversing roller device is provided inside the reversing roller device, one roller of the reversing roller device is configured as a free roller, the other roller is configured as a roller member supported by a coil spring, and both ends of the coil spring are connected to the roller member. and a support member to form a supported roller, and when paper is inserted into the invert chute, the rotation of the supported roller in contact with the paper is accumulated as a reaction force in the coil spring, and the coil spring is connected to the coil spring. A paper reversing device characterized in that a force accumulated in a spring is used to exhibit an action of sending paper toward an exit of a three-roller device.