JPS6223688B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic document feeder for feeding a document onto a platen of a copying machine.

Conventionally, as shown in FIG. 1, this type of document feeder is equipped with a placing roller b that moves along the upper surface of the platen a and a placing belt c wrapped around the placing roller b, which is placed above the platen a. It has already been proposed that a document e inserted through an insertion opening d is laid onto a platen a by a laying belt c as the laying roller b moves. However, in this device, the laying roller b is used to lay down the document e.
When the document e is moved, the document e is moved due to frictional resistance between the document insertion slot d and the document e, resulting in disadvantages such as misregistration, wrinkles, and damage to the document e.

The present invention was made for the purpose of eliminating such drawbacks, and provides an automatic document feeder that is provided with a roller that rotates in the vicinity of a placing roller so as to cancel out the frictional resistance that acts on the inserted document. This is intended to prevent misalignment of the registration and damage to the original.

The present invention will be described in detail below with reference to an embodiment shown in FIG. 2 and subsequent figures.

Reference numeral 1 denotes a box-like main body with an open bottom, and a document insertion port 2 is cut out on one side of the top surface, and a document ejection port 3 is formed by the lower edge 1b of the other side wall surface 1a. 1 has first, second, and third main frames 4, 5, and 6 arranged in parallel at intervals in the longitudinal direction.

Reference numeral 7 denotes a shaft that is rotatably horizontally mounted across the other sides of the first and second main frames 4 and 5 via bearings 8, and an input wheel 10 is provided at one end of this shaft 7 via a clutch 9. A belt 11 that is transmitted to a power source (not shown) is wound around the input wheel 10, and a wheel 12 is integrally provided on the input wheel 10.

This wheel 12 is connected to the third wheel via a cable 13.
Shaft 15 supported on main frame 6 via bearing 14
The power is transmitted to a wheel 16 fixedly attached to the shaft 15, and a friction wheel 17 attached to the shaft 15 is rotated.

A pair of sliders 18 are slidably inserted into longitudinal guide grooves 19 cut into the first and second main frames 4 and 5, and the shaft 20 extends between the pair of sliders 18.
is horizontally supported so as to be rotatable, and this shaft 20 is provided with a discharge roller 21 and a friction wheel 22, and is moved against a first stopper 24 provided on the main body 1 by the tension of a spring 23. The structure is such that the friction wheel 22 and the friction wheel 17 are biased to the ejection position where they are in contact with each other, and the friction wheel 22 and the friction wheel 17 are in contact with each other when the ejection position is reached.

Reference numeral 25 denotes a shaft that is horizontally supported via a bearing 26 over one side of the first and second main frames 4 and 5. A laying belt 27 is wrapped around this shaft 25, and the end of the shaft 25 is A rewinding mechanism 28', for example, a coil spring, a motor, etc., is provided in the section, and a rotational force is applied in the direction of winding the laying belt 27.

This laying belt 27 is wound around a laying roller 28 and then fixed to the main body 1 with a pin 21. The laying roller 28 is provided on the shaft 30, and
0 is rotatably supported horizontally between a pair of sliders 31 that are slidably inserted into the guide groove 19, and is moved near the document insertion slot 2 by the winding force of the laying belt 27. A guide body 33 is fixed to the slider 31, and the upper edge of the guide body 33 is connected to the document insertion slot when the slider 31 comes into contact with the second stopper 32 provided. 2
The document positioning member C is arranged so that the lower edge approaches the document positioning member C provided at the end of the platen B of the copying machine A.

Further, wheels 34 and 3 are provided on the shaft 7 and the shaft 30.
A cable 36 fixed to the wheel 34 is fixed to the main body 1 via a wheel 35, and a wheel 35 fixed to the shaft 30 is provided.
A wheel 37 is separately fixed between the end face of the laying roller 28 and the rotating roller 3 installed near the laying roller 28.
An endless belt 41 is wound between wheels 40 fixed to a shaft 39 of 8. The rotating roller 38 is provided so as to be located below the document insertion slot 2 when the placing roller 28 is in the standby position shown in FIG. 3, and rotates in the same direction as the placing roller 28 as the placing roller 28 rotates. It is starting to rotate to .

Next, the operation will be explained.

As shown in FIG. 7, the belt 27 is set at the document feed start position, the discharge roller 21 is set at the discharge position, and
A document D is inserted from the document insertion opening 2 along the guide body 33 and comes into contact with the document positioning member C.

If you press the print button in this state, solenoid 37
is activated, the clutch 9 is engaged, and the shaft 7 is rotated, so the cable 36 is wound around the wheel 34 and the shaft 30 guides the first and second main frames 4 and 5 via the slider 31. At the same time as it moves along the groove 19, the rotating roller 38 also rotates at a speed faster than the document laying speed due to the rotation of the laying roller 28.
It acts to cancel various forces that try to separate the original D from the original positioning member C, that is, frictional resistance. As a result, the documents D can be sequentially laid down on the platen B as shown in FIG. 8 without causing any positional deviation.

On the other hand, the exposure lamp E starts moving a little later than the laying roller 28 starts moving.

Then, when the laying roller 28 moves further, the guide member 33 comes into contact with the discharge roller 21, and thereafter the discharge roller 21 and the laying roller 28 move to the right together. At this time, the slider 18 provided on the shaft 20 of the discharge roller 21 slides along the guide groove 19.

When the roller further moves to the position shown in FIG. 9 (that is, the document feeding end position), the placing roller 28 and the discharging roller 21 are fixed and maintained at that position by a lock mechanism (not shown).

In this state, make the required number of copies.

When copying is completed, the lock mechanism is released and the clutch 9 is released. Then, since the shaft 25 is given a rotational force in the direction of rewinding the belt 27 by the unwinding force of the unwinding mechanism 28', the belt 27 is rewound, and the roller 27 is moved to the left in the figure and moved to the first position. At the same time, the ejection roller 21 is returned to the ejection position by the spring 23 so as to abut the second stopper 24 and return to the document feeding start position. (Fig. 10) In this state, the rotational force of the wheel 10 is transmitted to the shaft 15 via the wheel 12, cable 13, and wheel 16, and rotates the friction wheel 17. Therefore, the friction wheel 22 is rotated, and the shaft 20 is rotated. Due to the rotation, the discharge roller 21 rotates. When the discharge roller 21 rotates, the document D is discharged from the discharge port 3 as shown in FIG.

Note that at this time, the original D can be inserted through the insertion slot 2.

Note that the clutch 9 may have any structure, and the rewinding mechanism 28' may be a coil, a spring, etc., which accumulates unwinding force by repeatedly moving the belt 27, or the belt 27 may be used as a drive source such as a motor. It may also be driven during rewinding.

Further, the apparatus according to the present invention is attached to the copying machine A by various means. For example, it may be of a sliding type or an opening/closing type so that it can be moved between an operating position on the platen B and a non-operating position away from the platen B.

Further, complete automation can be achieved by providing a mechanism on the top of the main body 1 to automatically feed the document D into the insertion slot 2.

Since the present invention is configured as described above, the original can be automatically fed onto the platen, and the original can be automatically ejected after copying has been completed.

In addition, since a rotating roller that lightly contacts the document while rotating at a speed faster than the document loading speed is provided near the placing roller, the rotating roller counteracts the frictional resistance caused by the document coming into contact with the edge of the insertion slot. Since the eraser acts to erase the original, it is possible to prevent the original from shifting when it is placed, causing the registration position to go out of order, or from causing wrinkles on the original, thereby preventing damage to the original.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional device, Fig. 2 is a cross-sectional plan view showing an embodiment of the present invention, Figs.
Figure 5 is a vertical cross-sectional view of the line, - line, - line, and Figure 6 is a perspective view of the main part.
FIGS. 10 to 10 are explanatory views of the operation. 2 is an inlet, 3 is an outlet, 21 is a discharge roller, 2
7 is a belt, 28 is a laying roller, 38 is a rotating roller, B is a platen, C is a document positioning member, D
is the manuscript.

Claims (1)

[Claims] 1 A document insertion slot 2 into which the original D is inserted so as to come into contact with the document positioning member C, a member that reciprocates to lay the original D inserted into the insertion slot 2 on the platen B, and a member that moves back and forth to lay the original D on the platen B. The printed original D is sent to exit 3.
In a device configured with a discharge member that operates to discharge the document D further, the device rotates in contact with the document D to be laid near the member that reciprocates to lay the document D on the platen B, and acts on the document D. An automatic document feeder is provided with a rotating roller 38 that cancels out frictional resistance.