JPH0212848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an automatic document feeding mechanism used in a facsimile machine.

[Prior art]

FIG. 1 is a side view of the automatic document feeding mechanism of a conventional facsimile machine, in which 1 is a hopper, 2 is a feeding roller disposed at the front end of the hopper 1, and 3
is a driving pulley attached to the shaft of this feeding roller 2; 4 is a feeding rubber roller disposed above the hopper 1 so that a part of its outer circumference always protrudes; 5 is a feeding pulley attached to the shaft of the feeding roller 4; A driven pulley 6 is wound around the driven pulley 5 and the drive pulley 3, and 7 is a transmission belt that is wound around the driven pulley 5 and the drive pulley 3, and 7 is a transmission belt that is attached to the outer peripheral surface of the feeding rubber roller 4 that protrudes above the hopper 1 by its own weight or an extremely weak spring force. 8 is a reversing belt that contacts the feeding roller 2 and rotates in a direction opposite to the rotational direction of the feeding roller 2; 9a and 9b are the reversing belts 8; A supporting pulley 10 is a document.

In this configuration, the feed roller 2 is rotated in the direction of the arrow by a motor (not shown), and at the same time, the delivery rubber roller 4 is rotated via the drive pulley 3, transmission belt 6, and driven pulley 5. Then, the feeding rubber roller 4 feeds out the document 10 set on the hopper 1 to a contact position between the feeding roller 2 and the reversing belt 8, and the feeding roller 2 feeds the document 10 set on the hopper 1.
At this time, the reversing belt 8 is rotated in the opposite direction to the feed roller 2 by a motor (not shown), and the document 10 other than the bottom one that comes into contact with the feed roller 2 is hopped. It acts to keep it above 1.

However, in such a conventional automatic document feeding mechanism, a part of the feeding rubber roller 4 is connected to the hopper 1.
The leading edge of the original 10 is curled downward because it always protrudes upward and the pressure member 7 comes into pressure contact with the feeding rubber roller 4 to close the insertion gap for the original 10. However, there is a disadvantage that the tip of the document hits the protruding part of the feeding rubber roller 4 that protrudes above the hopper 1 and gets caught.
Furthermore, due to the contact frictional resistance caused by the feeding rubber roller 4, the insertability is significantly impaired, and the paper quality of the document 10 is therefore limited.

In addition, considering that originals 10 of various paper thicknesses are inserted, the pressing force of the pressurizing material 7 is limited so as not to impair the insertability, so that sufficient feeding force by the feeding rubber roller 4 is ensured. unable to
Therefore, when a large number of originals 10 are set on the hopper 1, or when the originals 10 have different paper qualities such as paper thickness and surface finish, the load resistance increases or
Another drawback is that the frictional force with the feeding rubber roller 4 becomes small, making it impossible to feed out the document 10.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned drawbacks of the prior art, and allows the document to be easily inserted and set, regardless of the type of document, the state of the edges, and the number of sheets, and allows for stable document feeding. The purpose is to make it possible.

[Structure of the invention]

A hopper having a window hole, a feed roller disposed at the front end of the hopper, a one-way clutch provided between the feed roller and its drive shaft, and a one-way clutch rotatably attached to the drive shaft. a frame, a feeding rubber roller rotatably supported by the frame via a shaft so as to be positioned below the window hole, a transmission collar attached to the drive shaft, and a transmission collar provided on the transmission collar. A pin provided on the drive shaft so as to fit into the notch, a friction plate installed between one side of the frame and the flange of the transmission collar, and the flange of the transmission collar connected through the friction plate. a compression spring that biases the transmission collar so as to come into pressure contact with one side of the frame; and a drive gear attached to the drive shaft;
a driven gear attached to the shaft; a transmission gear attached to one side of the frame so as to mesh with the drive gear and the driven gear to transmit the rotation of the drive shaft to the shaft; and a transmission gear rotatable above the hopper. a pressure plate disposed, a friction tongue piece attached to the pressure plate, a spring that applies a pressing force to the pressure plate so as to press the friction tongue piece against the feeding roller; A leaf spring is fixed to the pressure plate so as to maintain a slight gap between the two and the frame is rotated by the rotation of the drive shaft via the pin, the transmission collar and the friction plate. An automatic document feeding mechanism for a facsimile machine, characterized in that the document is projected from a window hole onto a hopper, and the document on the hopper is pressed against a plate spring with a constant pressure.

〔Example〕

Examples will be described below with reference to the drawings. FIG. 2 is a side view showing an embodiment of the automatic document feeding mechanism according to the present invention before operation, FIG. 3 is a side view showing the state during operation, and FIG. 4 is in the direction of arrow A in FIG. In the figure, 10 is a document, 11 is a hopper, and 12 is a window hole made at a predetermined position of the hopper 11.

13 is a feeding roller disposed at the front end of the hopper 11; 14 is a drive shaft passing through the center of the feeding roller 13; one end of this drive shaft 14 is connected to the side plate 1;
5a, and the other end is fixed to one shaft of an electromagnetic clutch 16 attached to the side plate 15b.
It is rotatably supported via. A drive pulley 18 is attached to the other shaft of the electromagnetic clutch 16, and the rotational force of a motor (not shown) is transmitted via a drive belt 19.

20 is a one-way clutch provided between the feed roller 13 and its drive shaft 14.

21 is a frame with a U-shaped planar shape,
The frame 21 is rotatably attached to the drive shaft 14 via a collar 22 and a transmission collar 23 so as to enclose the feeding roller 13, and the transmission collar 23 is provided with a notch 24. ,
A pin 25 is driven into the drive shaft 14 so as to fit into the notch 24 .

26 indicates one side of the frame 21 and the transmission collar 2.
A friction plate 27 is mounted between the flange of the drive shaft 14 and the drive gear 2 fixed to a predetermined position of the drive shaft 14.
Reference numeral 8 denotes a compression spring mounted on the drive shaft 14 between the drive gear 27 and the transmission collar 23. Due to the biasing force of the compression spring 28, the collar of the transmission collar 23 is pushed against the frame 2 through the friction plate 26.
It is pressed against one side of 1. 29 is an E-type retaining ring attached to the drive shaft 14, and this E-type retaining ring 2
Reference numeral 9 is for regulating the position of the collar 22.

30 is a shaft rotatably attached to the frame 21 so as to be parallel to the drive shaft 14;
The shaft 30 is provided with feeding rubber rollers 31a, 3.
1b is attached, and a driven gear 32 is fixed to one end of the shaft 30. A transmission gear 33 meshes with the driving gear 27 and the driven gear 32, and is rotatably supported by a post 34 provided on one side of the frame 21.

35 is a friction tongue; 36 is a pressure plate that presses the tip of the friction tongue 35 against the feeding roller 13; and 37 is a spring that applies a pressing force to the pressure plate 36. Reference numeral 38 denotes a leaf spring, and the rear end of the leaf spring 38 is fixed to the pressure plate 36 so that a slight gap can be maintained between the tip and the upper surface of the hopper 11.

Next, the operation of the above-described structure will be explained. First, as shown in FIG. 2, the original 10 is set on the hopper 11. At this time, the feeding roller 13 is not rotating, the feeding rubber rollers 31a and 31b are each located below the window hole 12 of the hopper 11, and therefore there is no obstacle on the hopper 11. , the original 10 enters between the feeding roller 13 and the friction tongue 35 and stops there.

Then, when a switch (not shown) is turned on to start the feeding operation, the electromagnetic clutch 16 becomes engaged, and at the same time, the motor (not shown) rotates, and its rotational force applies the drive belt 19, drive pulley 18, and electromagnetic clutch 16. The signal is transmitted to the drive shaft 14 via the signal. As a result, when the drive shaft 14 rotates, the rotational force is transmitted to the feed roller 13 via the one-way clutch 20, so the feed roller 13 rotates, and at the same time the rotational force is transmitted to the drive gear 27, transmission gear 33, and It is transmitted to the shaft 30 via the driven gear 32, thereby causing the delivery rubber rollers 31a, 31b to rotate in the same direction as the feeding roller 13.

On the other hand, the rotational force of the drive shaft 14 is also transmitted to the transmission collar 23 via the pin 25. As mentioned above, the flange of the transmission collar 23 is pressed against one side of the frame 21 via the friction plate 26 by the biasing force of the compression spring 28, so that the frame 21 receives a constant pressing force from the friction plate 26. In response to the rotational force, the third
As shown in the figure, it rotates in the direction of arrow B around the drive shaft 14.

When the frame 21 rotates in this way and its rear upper end hits the lower surface of the hopper 11, the frame 21 stops in this state, and the feeding rubber rollers 31a and 31b are pushed up and a part of their outer periphery is Each of them protrudes above the hopper 11 from the window hole 12, and presses the original 10 set in the hopper 11 against the tip of a leaf spring 38 located above it with a constant pressure. These feeding rubber rollers 31a, 31b
The reason why the pressing force is constant is that only a constant rotational force is transmitted to the frame 21 due to the pressure and frictional force of the friction plate 26.

Since the feeding rubber rollers 31a and 31b are rotating as described above, the document 10 is transferred to the feeding roller 1.
Original 1 is fed by feeding it with a constant force in the direction of 3.
0 is fed into the device by a feeding roller 13.

Here, when there are multiple documents 10, the lowest document 10 is fed by the feeding roller 13 which has a larger frictional force than the friction tongue 35, but the other documents 10 are stopped by the friction tongue 35. and will not be sent. Also, at this time, the feeding rubber roller 3
Only the bottom document 10 receives the feeding force of 1a and 31b, and the other documents 10 do not receive the feeding force, so jams and the like do not occur.

In this way, the documents 10 are reliably fed into the apparatus one by one. When all the documents 10 set on the hopper 11 have been fed, a document end detector (not shown) operates to close the electromagnetic clutch 16.
is cut and becomes unbonded.

When the electromagnetic clutch 16 is in the disengaged state, the rotation of the feed roller 13 is stopped by the frictional force with the friction tongue 35, while a reverse rotational force due to the gravity of the frame 21 is applied to the drive shaft 14. Here, the one-way clutch 20 provided between the feed roller 13 and the drive shaft 14 is free in the reverse direction of rotation of the drive shaft 14, so the drive shaft 14 rotates in the reverse direction and the frame 21 rotates in the opposite direction. The rubber rollers 31a and 31b return to their original positions as shown in FIG.
Since it returns to the lower position, after this, when the motor (not shown) is stopped, all operations are completed and the state returns to the initial state.

In this embodiment, the weight of the frame 21 applies a reverse rotational force to the drive shaft 14, but a weak reset spring is separately provided, and this reset spring rotates the frame 21 in the opposite direction of arrow B. It may be pulled in the direction.

〔Effect of the invention〕

As explained above, in the present invention, a frame supporting the payout rubber roller is attached to the drive shaft of the feeding roller, and the frame is rotated by a certain angle by the rotational force of the drive shaft, so that the payout rubber roller projects above the hopper. Therefore, when setting a document in the hopper, there is no obstacle on the hopper, and therefore, the document can be easily inserted and set regardless of the type of document, the condition of the edges, and the number of sheets.

Further, after the document is set, the feeding rubber roller is projected onto the hopper to feed the document to the feeding roller, so that stable feeding performance can be obtained.

In addition, since the pressing force of the feeding rubber roller against the document can be adjusted by the spring pressure of the compression spring that biases the transmission collar, an arbitrary feeding force can be obtained, and the feeding rubber roller protruding from the window hole and the plate spring can be used to press the document onto the hopper. When a document is held between the feed rollers, the pressure plate rotates, thereby stabilizing the contact pressure of the friction tongue against the feed roller in cooperation with the pressing force of the spring. This allows for stable feeding regardless of the paper quality of the originals or the number of sheets being fed, as well as suppressing the occurrence of jams, etc. Another advantage is that there is no need to provide a separate motor to rotate the frame. .

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional automatic document feeding mechanism, FIG. 2 is a side view showing an embodiment of the automatic document feeding mechanism according to the present invention in a state before operation, and FIG. 3 is a side view showing the automatic document feeding mechanism in its operating state. The side view, FIG. 4, is a plan view of the main part of FIG. 2 viewed from the direction of arrow A. 10... Document, 11... Hopper, 12... Window hole, 13... Feeding roller, 14... Drive shaft, 20
...One-way clutch, 21...Frame, 23...
...Transmission collar, 24...Notch, 25...Pin,
26... Friction plate, 27... Drive gear, 28... Compression spring, 30... Shaft, 31a, 31
b... Feeding rubber roller, 32... Driven gear, 3
3...Transmission gear, 35...Friction tongue piece, 38...Plate spring.

Claims (1)

[Claims] 1. A hopper 11 having a window hole 12, a feeding roller 13 disposed at the front end of the hopper 11, and a roller provided between the feeding roller 13 and its drive shaft 14. a directional clutch 20; a frame 21 rotatably attached to the drive shaft 14; and payout rubber rollers 31a, 31b rotatably supported by the frame 21 via a shaft 30 so as to be located below the window hole 12. a transmission collar 23 attached to the drive shaft 14; a pin 25 provided on the drive shaft 14 so as to fit into a notch 24 provided on the transmission collar 23; and one side of the frame 21. A friction plate 26 is installed between the transmission collar 23 and the flange of the transmission collar 23.
3, and a drive gear 27 attached to the drive shaft 14.
and a driven gear 32 attached to the shaft 30.
a transmission gear 33 attached to one side of the frame 21 so as to mesh with the drive gear 27 and the driven gear 32 in order to transmit the rotation of the drive shaft 14 to the shaft 30; and a transmission gear 33 rotatably arranged above the hopper 11. a pressure plate 36 and a friction tongue piece 35 attached to this pressure plate 36.
a spring 37 that applies a pressing force to the pressure plate 36 so as to press the friction tongue piece 35 against the feeding roller 13; Leaf spring 3 fixed to 36
8, and the rotation of the drive shaft 14 causes the pin 25 and the transmission collar 2 to
3 and the friction plate 26, part of the outer periphery of the feeding rubber rollers 31a and 31b protrudes from the window hole 12 onto the hopper 11, and the document 10 on the hopper 11 is fixed to the plate spring 38. An automatic document feeding mechanism for facsimile machines that uses pressure to press documents.