JPS6116278Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for copying machines, printing machines, etc., which is equipped with a paper feeding separation means.

BACKGROUND OF THE INVENTION Paper feeding devices are known which include a paper feed member for contacting and feeding the top sheet of a stack, and paper separation means arranged after the paper feed member in the paper feed path. The paper separating means in this type of paper feeding device includes, for example, an upper separating roller that rotates with respect to the paper advancing direction and a lower separating roller that rotates slightly in the opposite direction to the paper advancing direction. If double sheet feeding occurs accidentally, this serves to separate the sheet to be fed from the other sheets.

Conventionally, in this type of paper separating means, the rotation of a motor dedicated to the lower separating roller is reduced by a gear head, and the drive of the lower separating roller is transmitted by a sprocket and a chain. However, this method has the disadvantage that the cost is high due to the use of expensive parts such as the motor and gear head, and that the device becomes large because the installation space for the motor, gear head, etc. is required.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a paper feeding device equipped with a paper separating means.
Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a feeding member configured as a paper feeding roller 2 is in contact with the uppermost sheet of sheets 1 placed in a stack. When the paper feed roller 2 rotates, the uppermost paper is sent out in the direction of arrow A by the frictional force with the roller 2. A paper separating means 3 is provided behind the paper feeding roller 2 in the sending path A, and the paper separating means in this example is composed of a separating rotary body configured as an upper separating roller 4 and a lower separating roller 5, These upper and lower separation rollers 4 and 5 are located in pairs with each other.

In FIG. 2, the paper feed roller 2 is supported by a paper feed roller shaft 7 via a one-way clutch 6, and the paper feed roller shaft 7 is rotatably supported by side plates 8 and 9. A paper feed roller driving gear 10 is fixed between the side plates 8 and 9 of the paper feed roller shaft 7, and the gear 10 is connected to an intermediate gear 11 rotatably supported by the side plates 8 and 9.
It's meshing with. The intermediate gear 11 meshes with a drive gear 12 fixed to an upper separation roller shaft, which will be described later, and the drive gear 12 is driven by the gear 1 via the intermediate gear 11.
0 rotates the paper feed roller 2.

The upper separating roller 4 is supported by one end of an upper separating roller shaft 14 via a one-way clutch 13, and the upper separating roller shaft 14 is rotatably supported by side plates 8, 9 and a sleeve member 16 fixed to the side plate 15. Supported. An electromagnetic clutch 17 is fixed to the other end of the upper separation roller shaft 14, and the electromagnetic clutch 17
When the clutch is turned on, a sprocket 18 fixed to the clutch and a swing transmission mechanism configured as an eccentric cam 19 fixed to the sprocket 18 are rotatably supported by the upper separation roller shaft 14. Note that the singing motion transmission mechanism may use a link mechanism. The sprocket 18 is drivingly connected to a drive device (not shown), and the electromagnetic clutch 17
When turned on, the upper separation roller shaft 14 is driven, and the upper separation roller 4 and paper feed roller 2 rotate in the direction shown by the arrow in FIG.

In FIGS. 2 and 3, the lower separation roller 5 is fixed to one end of a lower separation roller shaft 20, and the lower separation roller shaft 20 has an axis 21 different from that of the roller shaft.
It is rotatably inserted into an eccentric shaft 21 having a. The eccentric shaft 21 is rotatably supported by a sleeve 22 connected to the sleeve member 16.

A drive arm 24 having two arms is supported at the other end of the lower separation roller shaft 20 via a one-way clutch 23. A contacting roller 25 is provided. A spring 26 is engaged with the other arm 24b of the drive arm 24 to provide an elastic action in the direction of bringing the roller 25 into contact with the eccentric cam 19, and the drive arm is transmission connected to the eccentric cam 19. .
In this case, the connecting direction of the one-way clutch 23 is the direction in which the rotational force is transmitted to the lower separation roller shaft 20 when the drive arm 24 shown in FIG. 4 is rotated in the direction of the arrow. A reverse stopper arm 28 is further supported at the other end of the lower separation roller shaft 20 via a one-way clutch 27 whose connection direction is the same as that of the one-way clutch 23. Fixed to the member. Note that the arm portion is fixed to a side plate or the like in a paper separating means in which the lower separating roller 5 is always brought into pressure contact with the upper separating roller 4.

A pressure member 2 having two arms is attached to the eccentric shaft 21.
9 is fixed, and one arm 29a of the pressure member 29 is connected to a solenoid 31 via a spring 30. The other arm 29b of the pressure member 29 has
A spring 32 for releasing separation pressure gives an elastic action to the pressure member 29 in the clockwise direction in FIG.
is locked. The pressure member 29 is the solenoid 3
1 is activated, it rotates counterclockwise around the axis 21a from the position shown by the chain line in FIG.
As shown by the solid line in the figure, the lower separation roller 5 rotates about the eccentric shaft center 21a as a fulcrum and comes into contact with the upper separation roller 4. In this case, the contact force can be adjusted by the separation pressure adjustment member 33.

The operation of the present invention will be explained.

When the main switch is turned on, the drive chain wrapped around the sprocket 18 starts running due to the drive of the drive device (not shown), and the sprocket 18
and an eccentric cam 1 fixed to the same sprocket 18
9 rotates. When the eccentric cam 19 rotates, the roller 25 attached to the drive arm 24 is rotated by the spring 26.
Since the roller 25 is in contact with the circumferential surface of the eccentric cam 19, the roller 25 follows the eccentric cam surface, and the drive arm 2
4 performs a rocking motion. When the drive arm 24 swings clockwise in FIG. 3, the drive force causes the drive arm 2
4, the lower separating roller shaft 20 is driven clockwise by the amount of the swing angle. At this time, the one-way clutch 2 built into the anti-reverse arm 28 responds to the drive of the lower separation roller shaft 20.
Since the roller 7 is in a sliding state, it has no effect on the rotation of the lower separation roller shaft.

When the drive arm 24 swings counterclockwise in FIG. 3, the one-way clutch 23 built into the drive arm 24 is in a slipping state, and the drive is not transmitted to the lower separation roller shaft, but the drive is in one direction. Co-rotation of the lower separation roller shaft 20 may occur due to sliding resistance when the clutch 23 is in a slipping state. but,
At this time, the one-way clutch built in the reverse stop arm 28 is in a driven state, and the reverse stop arm 28 is fixed to the pressure member 29, so that the above-mentioned rotation is prevented.

By repeating the above operation, the lower separation roller 5 rotates in a direction opposite to the direction in which the upper separation roller 4 rotates.

The lower separation roller 5 is driven intermittently as described above, but normally the upper separation roller 4 is driven as shown by the chain line in FIG.
Not in contact with When a paper feeding command is received here, the solenoid 31 is activated and the pressure member 29 is rotated. Normally, the pressure member 29 is located at the position indicated by the chain line in FIG. It is positioned in contact with the When the pressure member 29 rotates, the eccentric shaft 21 fixing the pressure member 29 rotates, and the lower separation roller 5 moves counterclockwise around the axis 21a of the eccentric shaft as a fulcrum, as shown in FIG. It rotates and comes into a pressurized state with the upper separation roller 4.

Further, the above paper feed command operates the solenoid 31 and turns on the electromagnetic clutch 17. When the electromagnetic clutch 17 is turned on, the drive of the sprocket 18 is transmitted to the upper separating roller shaft 14, causing the upper separating roller 4 and the driving gear 12 to rotate. Drive gear 1
2 is transmitted to a gear 10 fixed to the paper feed roller shaft 7 via an intermediate gear 11, and the paper feed roller 2 rotates to feed the uppermost sheet of stacked paper in the direction of arrow A shown in FIG. send to. Even if two sheets are accidentally fed here, the sheets to be fed are separated by the separating device 3.

FIG. 6 shows a modified embodiment of the present invention, in which the ratchet wheel 34 of the lower separation roller shaft 20 is fixed and locked in place of the reverse stop arm. A ratchet pawl 35 is rotatably supported by a support plate 36 fixed to the side plate 15. The ratchet pawl 35 is pressed in the locking direction of the ratchet wheel 34 by a spring (not shown) or the like.

In Fig. 7, paper feed roller 2 and separation roller 3
This paper feeding device is of a type in which a separation belt 38 is wound around the separation belt 7 as a separation rotating body, and the lower separation roller 5 is in pressure contact with the separation belt 38. A devised separation roller drive mechanism can be used.

As described above, according to the above structure, by using the drive of the upper separation roller to drive the lower separation roller, it is possible to provide the product at low cost without requiring expensive parts such as a motor and gear head. . Moreover, since the motor and gear head are eliminated, the device can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a paper feeding device according to the present invention, FIG. 2 is a sectional view of the paper feeding device according to the present invention, FIG. 3 is a sectional view taken along the line - - in FIG. 2, and FIG. 4 is a drive FIG. 5 is an explanatory diagram showing the rotation of the lower separation roller, FIG. 6 a is a sectional view showing another embodiment of the present invention, FIG. 6 b is a front view of the ratchet part, 7th
The figure is a schematic explanatory diagram of a paper feeding device of a different type from that of FIG. 1. DESCRIPTION OF SYMBOLS 1... Paper, 2... Paper feeding member, 3... Paper separation means, 4... Separation rotating body, 5... Lower separation roller,
19... Rocking transmission means (eccentric cam), 20... Lower separation roller shaft, 23... One-way clutch, 24...
...driving arm.

Claims (1)

[Scope of utility model registration request] It has a paper feeding member that contacts and feeds the uppermost sheet of the stacked papers, and a paper separating means disposed after the paper feeding member in the paper feeding path, and the paper separating means is a separating rotary member. In a paper feeding device of a copying machine, printing machine, etc., comprising a lower separation roller in pressure contact with the lower separation roller, a swing transmission means drivingly connected to the drive device of the separation rotary body, and a reciprocating a driving arm that performs a turning motion, the driving arm being supported by a shaft fixing the lower separating roller via a one-way clutch, and the connecting direction of the one-way clutch being the separating rotating body of the lower separating roller. The feeding and finishing device is characterized in that the direction of rotation is opposite to the direction of rotation.