JPH0494334A - Automatic paper feeding device - Google Patents

Abstract

PURPOSE:To form a certain original sheet interval in a simple structure by forming a notch on a roller shaft end part along axis so as to form an inserting part, and by inserting the inserting part into the hole part of a rotating member which transmits a rotational torque to the roller shaft, so as to achieve relative rotation in a certain range of angles. CONSTITUTION:An inserting part 42 is formed by making a notch on the end part of a roller shaft 4a along the axis, and is inserted into a hole part 46 in the center of a rotational member 44. Flat parts 48a, 48b are formed on the hole part 46, and the notch of the inserting part 42 is abutted on the flat parts 48a, 48b in a certain range of angles, and is rotated in an integrated manner. When an original sheet is separated from the feeding roller 4, after only the rotational member 44 is rotated in a certain range of angles while the feeding roller 4 is stopped, the feeding roller 4 is resumed rotation and driving. A gap is formed between the original sheet separated from the feeding roller 4 and the next sheet. An interval between original sheets can thus be formed in a simple structure.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention separates stacked originals one by one through a paper feed roller and conveys them to a reading unit, and the paper feed roller has one direction. The present invention relates to an automatic paper feeder equipped with a one-way clutch that transmits rotational torque only to the paper feeder.

More specifically, an insert provided on the roller shaft of the paper feed roller for transmitting rotational torque to the paper feed roller when the document being conveyed by the paper feed roller separates from the paper feed roller. The rotating member that inserts the documents rotates within a certain angle range relative to the insertion section, so that the paper feed roller stops rotating for a certain period of time and separates each document at a desired interval. It is designed to be transported at a distance.

[Prior Art] An automatic paper feeder is used to separate a plurality of stacked documents one by one and convey them to a reading section. As shown in FIG. 5, in this automatic paper feeding device, the paper feeding roller 4 is normally driven to rotate in the direction of the arrow, so that the stacked documents S are separated by a difference in the coefficient of friction with the separation rubber 6. The document sheet S is configured to be separated one by one from the lower document S and conveyed to the paper feed roller pair 8 side. This pair of paper feed rollers 8 conveys the separated one-sheet document S to a reading section 10, and the document S read by this reading section 10 is further conveyed in the direction of the arrow via a pair of conveying rollers 12. .

Here, in order to separate the rear end of the -th document S from the leading edge of the second document S, the circumferential speed of the pair of paper feed rollers 8 is made faster than the circumferential speed of the paper feed roller 4. It is set as follows. Therefore, when the negative number of originals S is being conveyed simultaneously by the paper feed roller pair 8 and the paper feed roller 4, the paper feed roller 4 applies a load to the original S. Furthermore, simply setting the circumferential speed of the pair of paper feed rollers 8 and the circumferential speed of the paper feed roller 4 is insufficient to ensure a sufficient distance between the trailing edge of the -th document S and the leading edge of the second document S. cannot be secured.

Therefore, conventionally, a one-way clutch is provided on the roller shaft on which the paper feed roller is installed to transmit the rotational torque from the drive means only in one direction, and the trailing edge of the -th document is connected to the paper feed roller. By not applying rotational torque to this paper feed roller within a predetermined angular range after it is separated from the feed roller, a sufficient distance can be secured between the trailing edge of this -th document and the leading edge of the second document. being done.

The conventional automatic paper feeder with this kind of innovation was replaced with the 6th one.
This will be explained in detail using FIGS. a and b and FIGS. 7 a and b.

As shown in FIG. 6a, the conventional automatic paper feeder 14 has a bearing 1 on a roller shaft 4a on which the paper feed roller 4 is provided.
A drive gear 18 constituting a drive means is mounted on the exterior via a one-way clutch spring 2.
The rotary member 22 that engages through 0 is fitted. A spring pin 24 is press-fitted into this roller shaft 4a,
This spring pin 24 engages with a set of fan-shaped protrusions 26 formed on the rotating member 22.

In such a configuration, when the drive gear 18 is rotated in a direction that involves the one-way clutch spring 20, the rotating member 22 rotates via the one-way clutch spring 20, and the convex portion 26 provided on the rotating member 22 rotates. .26
rotates the spring pin 24 in the direction of the arrow (see Fig. 6). Therefore, the paper feed roller 4 rotates via the roller shaft 4a to convey the document to the paper feed roller pair 8 side.

When a document is simultaneously conveyed by the paper feed roller 4 and the paper feed roller pair 8, the conveyance load of the paper feed roller pair 8 acts on the paper feed roller 4, so that the roller shaft 4a is moved by the drive gear 18.
The spring pin 24 rotates at a faster speed than the sixth
In the figure, the rotating member 22 is rotated to the position shown by the two-dot chain line.
Rotate in the direction of the arrow. At this time, the rotating member 22 rotates in a direction that spreads the one-way clutch spring 20 that is engaged with the rotating member 22, and the rotational torque of the drive gear 18 does not act on the roller shaft 4a.

Therefore, the document S is not subjected to unnecessary load from the paper feed roller 4, and is smoothly conveyed to the reading section 10. Next, when the rear end of the document S separates from the paper feed roller 4, the rotational force acting on the paper feed roller 4 is released, so the paper feed roller 4 rotates while being pressed against the separation rubber 6. Part 2
The rotation is stopped until the second convex portion 26 engages with the spring pin 24 again, that is, until the rotating member 22 rotates approximately 900 times. Therefore, during this time, the two-sheet original S
The separating operation is not performed, and a desired gap is formed between the -th original S and the second original S.

On the other hand, in an automatic paper feeder 26 according to another prior art shown in FIG. 1
A second rotating member 30 is used that is provided with a protrusion 29 that is joined to a protrusion 26a provided on the rotating member 22a. A D-shaped hole 32 corresponding to the insertion portion 28 is formed in the center of the second rotating member 30, the insertion portion 28 is inserted into the hole 32, and a retaining ring 34 is attached to the insertion portion 28. Ru.

Note that the same reference numerals as those of the automatic paper feeder 14 described above indicate the same components.

In such a configuration, the rotational torque of the drive gear 18 is transmitted to the second rotating member 3o via the one-way clutch spring 20 and the first rotating member 22a, and the second rotating member 3o
The paper is transmitted to the paper feed roller 4 via a roller shaft 4a provided with an insertion portion 28 inserted into the hole 32 of 0.

When the paper feed roller 4 rotates at a faster circumferential speed than the driving gear 18 via the document conveyed by the paper feed roller pair 8, the second rotating member 30 rotates through the convex portion 29.26a. The one-rotation member 22a is rotated to prevent a load from acting on the paper feed roller 4. On the other hand, immediately after the document leaves the paper feed roller 4, the convex portion 2 of the first rotating member 22a
The rotation of the paper feed roller 4 is stopped until the roller 6a is engaged with the convex portion 29 of the second rotating member 30.

[Problems to be Solved by the Invention] However, the automatic paper feeder 1 according to the prior art described above
4, it is necessary to provide a small hole for press-fitting the spring pin 24 into the roller shaft 4a, which has a relatively small diameter, which increases the processing cost and makes the work of adjusting the spring pin 24 complicated. Put it away. moreover,
After assembly, if it becomes necessary to replace the rotating member 22 or the one-way clutch spring 20, the spring pin 24 must be pulled out from the roller shaft 4a, and this type of replacement work cannot be performed efficiently. There is a problem.

On the other hand, although the automatic paper feeder 26 solves the problems in the automatic paper feeder 14, it requires the preparation of a second rotating member 30 in addition to the first rotating member 22a, which results in an increase in the number of parts. There are problems of soaring costs and an increase in work processes.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an automatic paper feeder that can easily reduce the number of parts and has excellent workability.

[Means for Solving the Problems] In order to solve the above problems, the automatic paper feeder according to the present invention includes an insertion portion at the end of the roller shaft, and a rotating member that transmits rotational torque to the roller shaft. A hole is provided in which the insertion portion is inserted and the insertion portion and the rotating member can be rotated relative to each other within a certain angular range.

[Function] In the automatic paper feeder according to the present invention having the above configuration, when a load is applied in the rotation direction of the paper feed roller that is conveying the document, rotational torque is transmitted to the paper feed roller. Transmission of rotational torque between the paper feed roller and the driving means is quickly interrupted via the one-way clutch, and unnecessary loads can be prevented from being applied to the document.

When the original is separated from the paper feed roller, the paper feed roller is stopped and only the rotary member rotates within a certain angle range through the insertion section and the hole. Since the paper feed roller is rotationally driven again via It comes to be done.

[Example] Hereinafter, an example of an automatic paper feeder according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of essential parts of an automatic paper feeder according to a first embodiment of the present invention, FIG. 2 is a longitudinal side view of the automatic paper feeder, and FIG. 3 is a front view of the automatic paper feeder. The enlarged view, FIG. 4, is a longitudinal sectional side view of the automatic paper feeder according to the second embodiment.

Note that the same reference numerals as those of the automatic paper feeder 14 described above indicate the same components, and detailed explanation thereof will be omitted.

In FIG. 2, reference numeral 40 indicates an automatic paper feeder according to this embodiment, and an insertion portion 42 is formed by cutting out the end of a roller shaft 4a constituting this automatic paper feeder 40 in the axial direction. In addition, a hole 46 is provided in the center of the rotating member 44, allowing the insertion portion 42 and the rotating member 44 to rotate relative to each other within a certain angular range α over the length into which the insertion portion 42 is inserted. (See Figures 1 and 3a).

The hole 46 includes flat parts 48a and 48b that engage with the flat part 42a of the insertion part 42, and a retaining ring 50 is attached to the end of the insertion part 42.

Next, the operation of the automatic paper feeder 40 configured as described above will be explained.

When drive torque is transmitted to the drive gear 8 under the action of a drive motor (drive means) not shown, the drive gear 18 rotates in a direction that engages the one-way clutch spring 20.
Rotating member 44 via this one-way clutch spring 20
rotational torque is transmitted to. The flat part 48a of the rotating member 44 pushes the flat part 42a of the insertion part 42, as shown in FIG.
During the rotation, the roller shaft 4a and the paper feed roller 4 rotate in unison, and a document separation and conveyance operation (not shown) is started.

This document reaches the paper feed roller pair 8 shown in FIG.
When the paper is conveyed integrally via the paper feed roller pair 8 and the paper feed roller 4, the circumferential speed of the paper feed roller pair 8 is faster than the circumferential speed of the paper feed roller 4. roller 4
rotates at a faster rotational speed than the drive gear 18. Therefore, the flat part 42a provided in the insertion part 42 of the roller shaft 4a moves from the flat part 48a of the rotating member 44 to the 48b side, and presses this flat part 48b in the direction of the arrow shown in FIG. . As a result, the rotating member 44 rotates in the direction in which the one-way clutch spring 20 widens relative to the driving gear 18, and the transmission of torque between the driving gear 18 and the rotating member 44 is quickly interrupted. Therefore, the drive gear 1 is attached to the paper feed roller 4.
Since the rotational torque of No. 8 does not act, unnecessary loads can be prevented from being applied to the document.

When the trailing edge of the first document leaves the paper feed roller 4, the rotational load on the paper feed roller 4 is released. Then, the rotational torque of the drive gear 18 is transmitted to the rotating member 44 via the one-way clutch spring 20, and the rotating member 44 rotates.

At this time, as shown in FIG. 3, the flat part 48b of the rotating member 44 and the flat part 42a of the insertion part 42 are joined,
No rotational torque is transmitted to the paper feed roller 4 until the flat portion 48a joins the flat portion 42a, that is, until the rotating member 44 rotates by the angular range α. As a result, the next document is not conveyed until the rotating member 22 rotates by the angle range α, and a desired gap is created between the next document and the first document that has separated from the paper feed roller 4. It comes to be formed.

In this way, in the automatic paper feeder 40, the roller shaft 4a is provided with the insertion portion 42, and the rotary member 44 is simply provided with the hole 46 so as to be rotatable within a certain angular range α relative to the insertion portion 42. This has the effect of not applying unnecessary load to the originals (and creating a desired gap between the originals. In particular, unlike conventional methods, it is possible to create a desired gap between the originals by providing a spring pin or using two rotating members. Compared to what is provided,
The advantages are that manufacturing costs can be effectively reduced, the number of parts can be reduced, and operability is excellent.

Next, an automatic paper feeder according to a second embodiment of the present invention will be explained using FIG. 4. Note that the same components as those of the automatic paper feeder 40 according to the first embodiment are given the same reference numerals, and detailed explanation thereof will be omitted.

The automatic paper feeding device 60 according to the second embodiment includes a first gear 62 and a second gear 6 connected to a drive means (not shown).
4 are provided together via the one-way clutch spring 20, and a drive gear 6 is provided as a rotating member on this second gear 64.
6 meshes. This drive gear 66 is provided with a hole 68 that is rotatable within a certain angular range α relative to the insertion portion 42 .

Therefore, in the automatic paper feeder 60 configured in this way,
Under the action of a drive means (not shown), the rotational torque of the first gear 62 is transferred to the second gear 6 through the one-way clutch spring 20.
4, and is further transmitted to the paper feed roller 4 via a drive gear 66 that meshes with the drive gear 66. This driving gear 66 performs the same function as the rotating member 44 that constitutes the automatic paper feeder 40.

[Effects of the Invention] As detailed above, according to the automatic paper feeder according to the present invention, an insertion portion is formed at the end of the roller shaft, and an insertion portion is formed in the rotating member that transmits rotational torque to the roller shaft. , a hole is provided in which the insertion portion can be inserted and the insertion portion and the rotating member can be rotated relative to each other within a certain angular range, thereby making it possible to effectively reduce the number of parts;
Moreover, assembly work can be easily performed and various works such as maintenance work can be simplified.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of essential parts of an automatic paper feeder according to a first embodiment of the present invention, FIG. 2 is a longitudinal side view of the automatic paper feeder, and FIG. 3 is a front view of the automatic paper feeder. The enlarged explanatory diagram, FIG. 4, is the second embodiment of the present invention.
FIG. 5 is a schematic explanatory diagram of a device incorporating a general automatic sheet feeding device; FIG. 6 is an explanatory diagram of a conventional automatic sheet feeding device; FIG. 7 is an explanatory diagram of another conventional automatic paper feeding device. 4...Paper feed roller 4a...Roller shaft 8.
...Paper feed roller pair 10...Reading section 18...
Drive gear 20...one-way clutch spring 40...automatic paper feeder 42...insertion section 42a...plane section 44
... Rotating member 46 ... Holes 48a, 48
b...Flat section 60...Automatic paper feeder 66...Drive gear 68
...Korube patent applicant Brother Industries, Ltd.

Claims (1)

[Claims] (1) The rotational torque from the driving means is transmitted only in one direction to the paper feed roller that separates the stacked documents one by one and conveys them to the reading unit, and to the roller shaft on which the paper feed roller is installed. In an automatic sheet feeder equipped with a one-way clutch for transferring the roller shaft, an insertion portion is formed by cutting an end of the roller shaft in the axial direction, and the insertion portion is attached to a rotating member that transmits rotational torque to the roller shaft. An automatic paper feeder comprising: a hole into which the insertion part is inserted, and the insertion part and the rotating member can rotate relative to each other within a certain angular range.