JPH0237788Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feeding device that feeds paper to a main body processing device such as a copying machine or a printing machine.

[Prior Art] Generally, in this type of apparatus, paper on a paper feed tray is fed out by a paper feed roller, and a separating means separates the paper one by one and supplies the paper to the main unit.

When feeding paper to the separation means using this paper feed roller, if the next paper is fed out excessively following the paper that has been separated by the separation means, it will cause double feed, so the first paper will not be fed into the separation means. The paper feed roller is moved away from the paper when it reaches the paper or after some time, or is stopped.

When the paper feed roller is stopped, the paper feed roller presses the trailing edge of the paper and becomes an obstacle to paper feeding. The present invention has a structure in which the paper feed roller feeds the paper by the required amount and then separates it from the paper.

Conventionally, as a device with this kind of structure,
Those described in JP-A-42149 and JP-A-56-28142 have been proposed and are well known.

In either case, the paper feed roller is attached to a bracket supported on the shaft of the separation means, and the bracket is moved up and down to bring the paper feed roller into contact with and away from the paper.

In particular, in Japanese Patent Publication No. 54-42149, the drive system that drives the paper feed roller and separation means and the drive system that moves the paper feed roller up and down are separate structures, and can be easily controlled by turning on and off an electromagnetic clutch. The drive of one motor is transmitted to each drive system.

Furthermore, in JP-A-56-28142, the rotation of the drive shaft of the separation means is used to bring the paper feed roller into contact with the paper, but the release of the spring is used to separate the paper feed roller from the paper. It is done by force.

[Problems to be solved by the invention] As described above, in the devices disclosed in Japanese Patent Publication No. 54-42149 and Japanese Patent Application Laid-open No. 56-28142, the driving of the paper feed roller and the vertical movement of the paper feed roller are performed separately. The problem is that the structure and control become complicated because the paper feed roller is raised and lowered by separate means.

The purpose of the present invention is to perform a feeding operation in which the paper feed roller approaches the stored paper, separates the paper into one sheet by the feed separation roller, and feeds the paper to the feed roller, and to stop the paper feed roller and the separation roller. At the same time, it is an object of the present invention to provide a paper feeding device which has a simple structure and is easy to control a standby operation in which a paper feeding roller is separated from and raised from the stored paper.

[Means for Solving the Problems] In order to achieve the above object, the features of the present invention are as follows.

That is, the feature of the present invention is that a drive shaft 7 is provided at the tip of the paper feed table 6 and is capable of forward and reverse rotation in the paper feeding direction and reverse direction. The separation roller 1a is rotatably mounted via a directional clutch 7', and the proximal end of the bracket 5 is rotatably mounted via a second one-way clutch 8, and the first one-way clutch 7' is connected to the drive shaft 7. When the drive shaft 7 rotates in the normal direction, it engages with the separation roller 1a, and when it rotates in the reverse direction, it disengages.
The direction of each clutch is set so that it engages with the base end of the clutch and releases when rotated in the normal direction, and the drive shaft 7 is rotated in the normal direction in response to a paper feed instruction signal, and the paper on the paper feed tray 6 is separated by the separation roller 1a. After feeding the sheet to the feed roller 4, the feed roller 2 is reversed by a predetermined angle to raise the sheet feed roller 2, and then the sheet feed roller 2 is connected to a driving means M capable of forward and reverse rotation.

[Function] Upon receiving the paper feed instruction signal, the drive means M rotates the drive shaft 7.
is rotated in the normal direction, whereby the one-way clutch 7' engages with the separation roller 1a, and the drive is transmitted from the separation roller 1a to the paper feed roller 2, while the second one-way clutch 8 rotates at the base of the bracket 5. The paper feed roller 1a is lowered onto the paper via the bracket 5 and is brought into pressure contact with the end portion, and the paper feed roller 2 feeds the paper on the paper feed table 6 to the feed roller 4.

Next, the driving means M reverses the driving shaft 7, whereby the second one-way clutch 8 engages with the base end of the bracket 5, and raises and separates the paper feed roller 1a from the paper via the bracket 5. At the same time, the first one-way clutch 7' is disengaged from the separation roller 1a, and the rotation of the paper feed roller 2 is stopped.

[Example] An example of the present invention will be described below based on the drawings.

In FIGS. 1 to 3, reference numeral 6 denotes a paper feed table on which paper is stacked and accommodated. A paper feed roller 2 is disposed above the paper feed table 6. At the tip of the paper feed tray 6, a separation means 1 is provided that separates the sheets fed out by the paper feed roller 2 one by one. In front of the paper feed tray 6 in the paper feeding direction, there is a feed roller 4 for carrying out the paper fed out from the separating means 1.
is installed.

A in the figure is a main unit of a copying machine, a printing machine, or the like.

The separating means 1 includes a separating roller 1a and a blocking member, for example, a blocking roller 1b, which opposes the separating roller 1a and prevents double feeding of sheets. The blocking roller 1b is
It is attached to the machine frame 11 so as to rotate in the opposite direction to the separation roller 1a.

A separation roller 1a is rotatably mounted on the drive shaft 7 via a first one-way clutch 7'.

Further, a bracket 5 extends from the drive shaft 7 toward the paper feed table 6, and the base end of the bracket 5 is rotatably attached to the drive shaft 7 via a second one-way clutch 8. In the illustrated one, a bracket 5 is formed from a pair of swing support rods 5a and 5b.
A one-way clutch 8 is attached to one of the swinging support rods 5a.
is equipped.

A paper feed roller 2 is supported at the tip of the bracket 5, and a shaft 9 of the paper feed roller 2 is connected to a drive shaft 7.
It is linked with chain 10.

The direction of the one-way clutch 7' of the separation roller 1a and the one-way clutch 8 of the bracket 5 is set as follows.

First, the one-way clutch 7' of the separation roller 1a is
It is set so that when the drive shaft 7 rotates forward in the sheet feeding direction (clockwise in FIG. 1), it engages with the separating roller 1a, and when it rotates in the reverse direction (counterclockwise in FIG. 1), it releases.

Therefore, when the drive shaft 7 rotates in the normal direction, the separation roller 1a is rotated in the normal direction, and when the drive shaft 7 rotates in the reverse direction, the rotation of the separation roller 1a is stopped.

Further, the one-way clutch 8 of the bracket 5 engages with the proximal end of the bracket 5 when the drive shaft 7 is reversed.
It is set to release in normal rotation.

Therefore, when the drive shaft 7 is reversed, the paper feed roller 2 is raised via the bracket 5 to the raised position where it is separated from the paper, and when the drive shaft 7 is reversed, the paper feed roller 2 is lowered to engage with the paper due to the weight of the bracket 5. It is designed to descend into position.

The drive shaft 7 is connected to a drive motor M via a worm gear 12 and a worm wheel 12'. The worm gear 12 constitutes a braking means for keeping the drive shaft 7 in a stationary position.

The drive motor M is capable of forward and reverse rotation.
That is, the drive motor M receives a paper feed instruction signal, rotates the drive shaft 7 in the normal direction, feeds the paper on the paper feed table 6 to the feed roller 4 via the separation roller 1a, and then rotates the drive shaft 7 in the reverse direction by a predetermined angle. The paper feed roller 2 is raised, and then the drive is stopped.

The paper feeding device configured as described above operates as follows.

When the drive motor M is started in response to the paper feed instruction signal and the drive shaft 7 is rotated in the normal direction, the drive shaft 7 and the one-way clutch 8 of the bracket 5 are disengaged, and the one-way clutch 7' of the separation roller 1a is engaged. The paper feed roller 2 and the separation roller 1a are moved in the feeding direction (second direction).
(clockwise).

At this time, the paper feed roller 2 of the bracket 5 descends onto the paper on the paper feed tray 6 due to its own weight and engages with the paper.

Then, the paper is fed out by the paper feed roller 2, separated between the separation roller 1a and the blocking roller 1b, and sent to the feed roller 4 side.

When the leading edge of the paper passes through the separation roller 1a and is bitten by the feed roller 4, the drive motor M is momentarily reversed, and the drive shaft 7 is reversed.

At this time, the drive shaft 7 and the one-way clutch 8 of the bracket 5 are engaged, and the one-way clutch 7' of the separating roller 1a is released.

Therefore, as shown in FIG. 1, the bracket 5 swings upward in the clockwise direction in FIG. 1 while the separation roller 1a is stopped.

After the bracket 5 swings by a predetermined angle due to this instantaneous reversal of the drive motor M, it is supported by the worm gear 12 of the drive motor M and is locked in its position.

In this state, when the next paper feed instruction signal is received and the drive motor M is rotated in the normal direction, the bracket 5 first swings down to the state shown in FIG. 2, and the above operation is repeated.

The reason why the worm gear 12 is interposed in the drive system (13 in the figure) between the drive motor M and the drive shaft 7 is that the drive shaft 7 can feed paper due to the weight of the bracket 5 and the paper feed roller 2 attached thereto. This is to prevent the roller 2 from rotating in the downward direction. Therefore,
This is because if the load torque of the drive system 13 is larger than the rotational torque due to the bracket 5's own weight, there is no need to employ a worm gear. Further, a braking means other than a worm gear for maintaining the rest position of the drive shaft 7 may be provided between the drive motor M and the drive shaft 7.

The paper feeding device of this embodiment described above has the following advantages.

(1) By controlling the forward rotation, reverse rotation, and rest of one drive shaft 7, the paper feed roller 2 is engaged with the paper on the paper feed table 6, and the paper is fed out, separated into one sheet by the separation roller 1a, and then transferred to the feed roller. 4, and a standby operation in which the paper feed roller 2 and separation roller 1a are stopped, the paper feed roller 2 is moved to a position separated from the paper on the paper feed table 6, and held at that position, Its structure is simple and control is easy.

(2) When raising the paper feed roller 2 to separate it from the paper, the rotation of the drive shaft 6 prevents the separation roller 1a from rotating in the opposite direction due to the one-way clutch 7', causing the paper feed roller 1a to be fed out. There is no risk of paper being returned.

[Effects of the invention] The invention consists of the above structure and has the following effects.

(1) By controlling the forward rotation, reverse rotation, and rest of one drive shaft, the paper feed roller engages the paper on the paper feed tray, feeds it out, separates it into sheets with the separation roller, and feeds the paper to the feed roller. operation, and a standby operation in which the paper feed roller and separation roller are stopped, the paper feed roller is moved to a position away from the paper on the paper feed table, and held at that position.The structure is simple and controllable. is easy.

(2) When raising the paper feed roller to separate it from the paper, the separation roller does not rotate in the opposite direction due to the rotation of the drive shaft due to the one-way clutch, so there is no risk of the unfed paper returning. .

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is an overall explanatory view, FIG. 2 is an explanatory view of the operating state, FIG. 3A is a plan view, and FIG. 1: Separation means, 2: Paper feeding means, 4: Feed roller, 5: Bracket, 6: Paper feeding table, 7: Drive shaft, 7': First one-way clutch, 8: Second one-way clutch, 12 : Braking means, M: Drive motor.

Claims (1)

[Claims for Utility Model Registration] (1) A paper feed tray 6 for stacking and accommodating paper; a separation roller 1a disposed at the tip of the paper feed tray 6 that rotates in the paper feeding direction; and the separation roller 1a. a blocking member 1b that opposes and prevents double feeding of sheets; a paper feed roller 2 that is driven by the separation roller 1a and is located above the paper feed table 6 and feeds out the paper; It is equipped with a feed roller 4 disposed at the front in the paper direction to carry out the paper fed out from the separation roller 1a, and a drive means M that transmits drive to the separation roller 1a and the paper feed roller 2, and whose base end is freely rotatable. In the paper feed device, the paper feed roller 2 is supported on the tip of the bracket 5 which is supported on the tip of the paper feed tray 6, and is raised and lowered between a lowered position where it engages with paper and a raised position where it separates from the paper feed roller 2. A drive shaft 7 capable of forward and reverse rotation in the paper feeding direction and reverse rotation in the paper feeding direction is provided, and the separation roller 1a is connected to the drive shaft 7 via a first one-way clutch 7', and a second The proximal ends of the brackets 5 are rotatably attached via one-way clutches 8, and this first one-way clutch 7' engages the separation roller 1a when the drive shaft 7 rotates in the normal direction, and releases it when the drive shaft 7 rotates in the reverse direction. The second one-way clutch 8 sets the direction of the clutch so that it engages with the base end of the bracket 5 when the drive shaft 7 rotates in the reverse direction and disengages when it rotates in the normal direction. Receiving a signal, it rotates forward and feeds the paper tray 6.
A paper feeding device connected to a driving means M capable of forward and reverse rotation, which feeds the upper paper to a feed roller 4 via a separation roller 1a, reverses the paper by a predetermined angle, raises the paper feed roller 2, and then stops the drive. . (2) A sheet feeder according to claim 1, characterized in that a braking means 12 is provided between the drive means M and the drive shaft 7 to hold the drive shaft 7 stationary in a stopped state.