JPS5997943A - Automatic original feed mechanism in facsimile device - Google Patents

Abstract

PURPOSE:To stably feed an original, by providing such an arrangement that a frame is rotated by a predetermined angle by the torque of a drive shaft to project out pay-out rubber rollers above a hopper so that the set original is fed to a feed roller. CONSTITUTION:Predetermined thrust force and torque are given to a frame 21 through a friction plate 26 by transmitting the torque of a drive shaft 14 to a transmitting coller 23 to rotate the frame 21 around the drive shaft 14 in the direcrion B, and therefore, pay-out rollers 31a, 31b are pushed up to project out their outer peripheries in part from an aperture 12 above a hopper 11 so that an original 10 set on the hopper 11 is pressed against an upper plate spring 38 with a predetermined pressure by these pay-out rollers 31a, 31b. Then the original is fed under a predetermined force toward a feed roller 13 by the pay-out rollers 31a, 31b on rotation which therefore feed the original 10 into a facsimile device.

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. 2
a drive pulley attached to the shaft of the feed-out rubber roller 4; 6 is a transmission belt wound around the driven pulley 5 and the drive pulley 3; T is a belt that is pressed against the outer peripheral surface of the feeding rubber roller 4 protruding above the hot spring 1 by its own weight or an extremely weak spring force; 8 is a reversing belt that contacts the feed roller 2 and rotates in a direction opposite to the rotational direction of the feed roller 2;
9a and 9b are pulleys that support the reversing belt 8, and 10 is a document.

In this configuration, the feed roller 2 is rotated in the direction of the arrow by the motor on the left side of the figure, and at the same time the drive pulley 3 and the transmission belt 6 are rotated.
And the feeding rubber roller 4 is rotated via the driven pulley 5. Then, the feeding rubber roller 4 feeds out the document 10 set on the hopper 1 to the contact position between the feeding roller 2 and the reversing belt 8, and the feeding roller 2 feeds the document 10 one sheet at a time. , at this time, the reversing belt 8
is rotated by a motor or the like (not shown) in the opposite direction to the feed roller 2, and has the function of keeping documents 10 other than the bottom one that comes into contact with the feed roller 2 on the hopper 1.

However, in such a conventional automatic document feeding mechanism, a part of the feeding rubber roller 4 always protrudes above the hopper 1, and the pressure material T comes into pressure contact with this feeding rubber roller 4, causing the document 10 to be If the leading edge of the document 10 is curled downward due to the closing of the insertion gap,
There is a drawback that the tip hits and gets caught on the protruding part of the feeding rubber roller 4 that protrudes above the hopper 1, and if the document 10 is thin or has a weak stiffness, the contact friction caused by the pressure material I and the feeding rubber roller 4 Due to the resistance, the insertability is significantly impaired and the paper quality of the original 10 is limited.
In consideration of the fact that 0 is inserted and pulled out, the pressing force of the pressurizing member 7 is limited so as not to impair its insertability, so it is not possible to ensure a sufficient feeding force by the feeding rubber roller 4.
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 and the frictional force with the feeding rubber roller 4 decreases. Therefore, there was also a drawback that the document 10 could not be fed out.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and it is possible to easily insert and set a document regardless of the type of document, edge condition, and number of documents, and to feed the document stably. The purpose is to enable people to do this.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention rotatably attaches a frame supporting a feeding rubber roller to the drive shaft of a feeding roller, and also includes a friction plate attached to the drive shaft and pressed to the frame through the friction plate. A transmission collar biased by a spring is attached to the hopper, and a leaf spring is provided to maintain a small gap with the top surface of the hopper.When the drive shaft rotates during document feeding, the transmission collar and friction plate connect the p frame. When the rubber roller rotates, a part of the outer periphery of the feeding rubber roller protrudes above the hopper through a window hole provided in the hopper.

〔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 indicated by the arrow in FIG. This is a plan view of the main part seen from 1 in the figure.
0 is a document, 11 is a hopper, and 12 is a window hole drilled at a predetermined position in 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, and one end of this drive shaft 14 is connected to an electromagnetic shaft attached to the side plate 15a. It is fixed to one shaft of the clutch 16, and the other end is fixed to the side plate 15.
b is rotatably supported via a bearing 17. 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 through a drive belt 19.

20 is a one-way clutch provided between the feed roller 13 and its drive shaft 14; 021 is a frame having a U-shaped planar shape; the frame 21 is designed to enclose the feed roller 13; The transmission collar 23 is rotatably attached to the drive shaft 14 via a collar 22 and a transmission collar 23, and the transmission collar 23 is provided with a notch 24 so as to fit into the notch 24. A bottle 25 is driven into the drive shaft 14.

26 is a friction plate mounted between one side of the frame 21 and the flange of the transmission collar 23; 21 is a drive gear fixed to a predetermined position of the drive shaft 140; 28 is a friction plate mounted between the drive gear 27 and the A compression spring is attached to the drive shaft 14 between the transmission collar 23 and the compression spring 28. Due to the biasing force of the compression spring 28, the collar of the transmission collar 23 is pressed against one side of the frame 21 via the friction plate 26. It's wandering. 29 is the drive shaft 1
This E-type retaining ring 29 is for regulating the position of the collar 22. 030 is rotatably attached to the frame 21 so as to be parallel to the drive shaft 14. The shaft 30 is equipped with feeding rubber rollers 31a and 31b, and a driven gear 32 is fixed to one end of the shaft 30.
A transmission gear 33 meshes with the drive gear 27 and the driven gear 32, and is rotatably supported by a slim boss 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; 3γ is a spring that applies a pressing force to the pressure plate 36; 038 is a leaf spring; (The rear end of the screw 38 is fixed to the pressure plate 36 so that a slight gap can be maintained between the tip and the top surface of the hopper 11.) Next, to explain the operation of the above-mentioned configuration, first, FIG. As shown in the figure, the original 10 is set on the hot spring 11. At this time, the feeding roller 13 is not rotating, and the feeding rubber rollers 31a and 31b are each located below the window hole 12 of the hopper 11. Therefore, since there is no obstacle on the hopper 11, the raw material 4 height 10 is condensed between the feeding roller 13 and the friction tongue 35 and stops. When the electromagnetic clutch 16 enters the engaged state, a motor (not shown) rotates at the same time, and one rotational force is applied to the drive belt 1.
9, is transmitted to the drive shaft 14 via the drive pulley 8 and the electromagnetic clutch 16. When the drive shaft 14 rotates due to this, the rotational force is transferred to the feed roller 13 via the one-way clutch 20.
As a result, the feeding roller 13 rotates, and at the same time, the rotational force is transmitted to the shaft 30 via the driving gear 27, the transmission gear 33, and the driven gear 32. It rotates in the same direction as the feed 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 collar of the transmission collar 23 is transferred to the frame 23 via the friction plate 26 by the biasing force of the compression spring 28. The frame 21 is pressed against one side of the frame 21, so that the frame 21 receives a constant pressing force and rotational force from the friction plate 26, and rotates about the drive shaft 14 in the direction of arrow B as shown in FIG. .

When the frame 21 rotates in this way and its rear upper end hits the lower surface of the hopper 11, the frame 21 in this state
stops, and the rubber rollers 31a, 31b are fed out by this mechanism.
When the hopper is pushed up, a part of its outer periphery protrudes from the window hole 12 onto the hopper 11, and the document 1 set in the hopper 11 is
The reason why the pressing force of the feeding rubber rollers 31a and 31b is a constant pressure is because the pressure of the friction plate 26 and the frictional force cause the frame 21 This is because only a constant rotational force is transmitted to the feeding rollers 31a and 31b as described above, so the document 10 is fed in the direction of the feeding roller 13 with a constant force. One original document 10 is fed into the apparatus by a feeding roller 13. Here, if there are many original documents 10, the lowest original 10 is transferred to a feeding roller with a larger frictional force than the friction tongue piece 35. 13, but the other originals 10 are stopped by the friction tongue 35 and are not fed again.
Only the bottom document 10 receives the feeding force of 1b, and the other documents 10 do not receive the feeding force, so jams and the like do not occur.

In this way, the originals 10 are reliably fed into the apparatus one by one.'=l:T'L0 Then, when all the originals 10 set on the hopper 11 are fed, The document end detector operates and the electromagnetic clutch 16 is disengaged, resulting in a disengaged state.

When the electromagnetic clutch 16 is in a disengaged state, the feeding roller 1
3 is stopped from rotating due to the frictional force with the friction tongue piece 35.On the other hand, a reverse rotational force is applied to the drive shaft 14 due to the gravity of the frame 210. Here, the one-sided clutch 20 provided between the feed roller 13 and the drive shaft 14 is free in the reverse rotation direction of the drive shaft 14, so the drive shaft 14 rotates in the reverse direction and the frame 21 is rotated in the opposite direction. The rubber rollers 31a and 31b also return to the position below the window hole 12 as the rollers return to their original positions as shown in FIG. and return to the initial state.

In this embodiment, a reverse rotational force is applied to the drive shaft 14 by the weight of the frame 21, but a reset spring with a weak force is separately provided, and this reset spring causes the frame 21 to move in the direction opposite to the direction of arrow B. It may be tensile.

〔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, and the payout rubber roller protrudes above the hopper (14 parts). Therefore,
When setting a document in the hopper, there is no obstacle on the hopper, so the document can be easily inserted and set regardless of the type of document, the state of the edge, and the number of sheets.

Further, after the document is loaded, 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, any desired feeding force can be obtained. In addition to being able to perform feeding, the occurrence of jams, etc. can be suppressed, and there is also the advantage that there is no need to separately provide a motor to rotate the frame.

[Brief explanation of the drawing]

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... Original 11... Hopper 12... Window hole
13... Feeding roller 14... Drive shaft 2o...
One-way clutch 21...Frame 23...Transmission collar 24...Notch 25...Pin 26...
Friction plate 21... Drive gear 28... Compression spring 3o... Shaft 31a, 31b... Feeding rubber roller 32... Driven gear 33... Transmission gear
35... Friction tongue piece 38... Leaf spring patent Applicant Oki Electric Industry Co., Ltd. Agent Patent attorney Takashi Kanakura 24f)-

Claims (1)

[Claims] 1. A hopper having a window hole, a feeding roller disposed at the front end of the hopper, and a one-way clutch provided between the feeding roller and its drive shaft. a frame rotatably attached to the drive shaft; a payout rubber roller rotatably supported by the frame via a shaft so as to be positioned below the window hole; and a rubber roller attached to the drive shaft. A transmission collar mounted between the transmission collar, a pin provided on the drive shaft so as to fit into a notch provided in the transmission collar, and one side of the frame end and a flange of the transmission collar. a slim friction plate, a compression/pull that biases the transmission collar so that the flange of the transmission collar presses against one side of the frame via the friction plate, and a gear that transmits the rotation of the drive shaft to the shaft; A plate spring is arranged to maintain a slight clearance from the top surface of the hopper, and the pin is rotated by rotation of the drive shaft. An automatic document feeding mechanism for a facsimile machine characterized in that a frame is rotated through a transmission collar and a friction plate to cause a part of the outer periphery of a feeding rubber roller to protrude upward.