JPH0124039Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feeding device for copying machines, printing machines, etc.

In general, various types of paper feeding devices are known that separate stacked sheets of paper one by one and supply them to the main unit of a copying machine, printing machine, etc., but the present invention has a separating roller installed in front of the paper storage table. The uppermost paper stacked on the separation roller is fed out by a hard crawler and separated one by one.

Such devices are broadly divided into those in which the rotation of the hard crawler stops when the paper is eaten by the separation roller, and those in which the hard crawler retreats from the paper. This point becomes a problem.

First of all, when refilling and setting paper with the paper crawler hanging down on the stacked paper storage table, the user must remove the wood crawler from the storage table before the paper can be inserted, and there is a risk of damage such as folding of the leading edge of the paper. There is a fear.

Further, if the hard crawler does not always feed the paper under the same conditions as the paper gradually decreases on the storage table, non-feeding, double-feeding, etc. will occur.

However, conventionally, the raising and lowering of this hard crawler is controlled by a cam installed on the separation roller, so when the user replenishes paper on the storage table, the hard crawler is in the raised position, and when the user replenishes paper, the hard crawler is in the raised position. It has the disadvantage that it is difficult to maintain the conditions for holding the paper in uniform pressure contact with the paper that gradually decreases.Furthermore, cam-based control requires a complicated and large-sized mechanism, and the cam has to hold the hard crawler against the paper for a certain period of time. In the case where the friction coefficient is large and small, the condition of the paper reaching the separation roller is significantly different, and this is limited to the use of substantially uniform paper.

Further, there is also known a device in which the hard crawler is lowered in the paper pressure contact direction by the biasing force of a spring, and when raised, the spring is released by a solenoid, but this method has the same problem as above.

In view of the above points, the present invention has been developed so that when the paper feeding device is not operating, the wood crawler is in a retracted position from the storage table, and in this state, the user can easily replenish paper, and when the paper feeding operation is performed, The hard crawler engages the paper in almost the same way regardless of the amount of paper, and furthermore, depending on the conditions of the separation roller, it separates from the paper in a timely manner and there is no risk of excessive feeding, ensuring reliable paper feeding. The purpose is to provide a paper feeding device that can be obtained.

The configuration will be described in detail below based on one embodiment shown in the drawings.

First of all, the present invention constantly biases the control for raising and lowering the wood crawler, which is pivotally supported on a swinging support rod, in the upward direction, so that when the device is not in operation, the wood crawler maintains a retracted position from the storage stand, and the separation roller When feeding paper, the force of the hard crawler is released and it descends under its own weight, and after the paper is pressed, it engages under almost constant and stable conditions regardless of the amount of paper, and when withdrawing from the paper, the activation solenoid is activated. The suction operation is canceled and the robot is quickly evacuated by the upward biasing force.

In the illustrated embodiment, the stacked paper storage stand 3 is a normal paper tray, and a wood crawler 5 is mounted on the top of the paper tray.
Separating means 1 are disposed in front of the feeding direction, and the paper 6 on the storage table 3 is separated by a hard crawler 5.
The paper is then sent to a separating means 1, where it is separated one by one and sent to a feed roller 10. A in the figure is a main unit such as a copying machine or a printing machine.

The separation means 1 is composed of a separation roller 1a and a friction pad 1b pressed against the separation roller 1a.The separation roller 1a is rotatably supported on a machine frame 11 with a bracket, and the friction pad 1b is attached to the machine frame 11 with a leaf spring 12. They are attached so that they press against each other. In addition to this, various types of separation means 1 can be used, such as forward and reverse rotation pressure contact rollers, forward rotation rollers and fixed rollers, and the like.

The wood crawler 5 is attached to a swinging support rod 4 whose base end is supported on the rotating shaft 2 of the separation roller 1a, and extends above the storage table 3.

The separation roller 1a and the wood crawler 5 are rotated by the drive motor M, and the gear 13 of the motor M shaft meshes with the gear 14 of the rotation shaft 2 of the separation roller, and the rotation shaft 2 of the separation roller and the wood crawler are rotated. A power transmission belt 15 is provided which is stretched around the rotating shaft 5.

Further, an empty sensor _S1 is provided on the paper table 3, and a sensor _S2 is provided between the separation roller 1a and the feed roller 10.

Therefore, the lifting and lowering of the hard crawler 5 supported on the swing support rod 4 will be explained.
A biasing spring 7 and an actuating solenoid 8 are engaged with the base end 4a via an operating piece 9.

The operating piece 9 is a plate having a long groove 9' that fits into the base end 4a of the swinging support rod 4, and a biasing spring 7 is attached to one end of the plate to move the tight crawler 5 away from the top stacked paper, that is, to move it away from the storage table 3. The operating solenoid 8 is connected to the other end of the operating piece 9;
When it is OFF, the swing support rod 4 is held in the state shown in Fig. 1 by the action of the biasing spring 7, and when the operating solenoid 8 is turned ON, it moves against the spring 7 to the state shown in Fig. 2, and its long groove 9' The base end portion 4a of the swing support rod 4 does not engage with the base end portion 4a. Therefore, the swing support rod 4 descends under its own weight and comes into pressure contact with the topmost sheet of paper on the storage table 3.

Here, to explain the operation piece 9 in detail, as shown in FIG.
When it is OFF, the swing support rod 4 is in a position (engaged position) where it is separated from the paper by a biasing spring. Therefore, the wood crawler is also held in the raised position.

Next, when the operating solenoid 8 is turned on, the operating piece 9 moves against the biasing force of the biasing spring, lowering the swing support rod 4, and the hard roller 5 comes into pressure contact with the paper. Thereafter, the actuating solenoid 8 maintains the ON state, and the operating piece 9 moves to a position (disengagement position) away from the swinging support rod base end 4a and outside the movement trajectory (downward trajectory range), and It does not engage with the base end portion 4a.

Therefore, the hard crawler comes into contact with the paper to be fed out with a substantially constant pressing force, and the paper can be fed in a stable state.

However, if the paper 6 is inserted into the storage table 1 in the state shown in FIG. 1, and the drive motor M is activated upon receiving a paper feed signal from the main unit A side, the separation roller 1a and the paper crawler 5 will rotate. If the operating solenoid 8 is turned on at the same time as this, the swinging support rod 4 will be moved from the operating piece 9.
is released, the hard crawler 5 and the swing support rod 4 swing down to the state shown in FIG. 2 and engage with the topmost sheet of paper 6.

Then, the hard crawler 5 feeds this uppermost paper to the separation roller 1a, and the sensor _S2 detects that it is bitten by the separation roller 1a, and turns off the operating solenoid 8 based on the signal. When the operating solenoid 8 is stopped, the swing support rod 4 is raised and retracted by the operation piece 9 by the action of the biasing spring 7 to the state shown in FIG. 1, and the engagement with the paper is released.

In this process, the paper sent out by the hard crawler 5 is separated by the separating means 1, but the hard crawler 5
There is no possibility that the paper will not reach the separating means 1 and become a non-feed, or that it will be fed excessively and become a double feed.

In the present invention, the operating piece 9 is not limited to the plate piece having the long groove 9' shown in the figure, but has a structure in which the force of the biasing spring 7 acts on the swinging support rod 4, and this acting force is canceled by the operating solenoid 8. If so, various shapes and structures such as a hook-like protruding piece and an engaging pin-like piece can be adopted as appropriate.

The present invention consists of the above-mentioned structure, in which the rocking support rod to which the wood crawler is attached is always held in a position away from the storage table using a biasing spring, and when the paper is fed out, the force of the spring is released using an operating solenoid, and the wood crawler is moved under its own weight. When the device is not feeding paper, the paper crawler on the storage stand will maintain its retracted position, and the user can set the paper by simply inserting the paper onto the storage stand. There is no risk of folding the leading edge of the paper. In addition, during paper feeding operation, by moving the operating piece on the rocking support rod that supports the wood crawler, the wood crawler moves in the paper pressing direction by its own weight, and after the wood crawler is in pressure contact with the paper, the rocking support rod Since the operation piece is located in a position retracted from the paper, it contacts the paper with a stable pressure force as the paper volume gradually decreases, regardless of the size of the paper volume, so that a uniform feed amount is always obtained, and the separating means It is possible to ensure separation of the feed and eliminate inconveniences such as non-feed and double feed.

Furthermore, the lifting and lowering of the wood crawler is controlled by the operating solenoid.
Since it is controlled by ON/OFF, timing control can be ensured and easily achieved by turning ON/OFF of this operating solenoid according to the separation means, such as by detecting the amount of paper being fed out. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall explanatory diagram, FIG. 2 is an explanatory diagram of its operating state, FIG. 3 is an explanatory diagram of the main part, and FIG. 4 is an enlarged view thereof. 1... Separation means, 3... Laminated paper storage stand, 4...
Swinging support rod, 5... Tight crawler, 7... Biasing spring, 8... Operating solenoid, 9... Operation piece.

Claims (1)

[Claim for Utility Model Registration] A storage table 3 for loading and storing paper; a separation means 1 provided in front of the storage table 3 for separating sheets one by one; and a wood crawler for feeding out the sheets toward the separation means 1. 5, and extends above a storage stand 3 whose base end is supported by a frame and whose distal end supports the wood crawler 5 and allows the wood crawler to rise and fall between a lowered position in contact with the paper and a raised position away from the paper. a support lever 4, and an elastic means 7 for moving the support lever 4 up and down.
and an operating solenoid 8, an operating piece 9 that engages and disengages from the support lever 4.
is interposed between the support lever 4, the elastic means 7, and the actuating solenoid 8, and one end of the operation piece 9 is provided with an upward direction that moves the hard crawler supported by the support lever 4 away from the paper on the storage table 3. an elastic means 7 is connected and arranged to urge the
An operating solenoid 8 is arranged and connected to the other end of the operating piece 9 at a position opposite to the direction of the urging force of the elastic means 7, which is the direction in which the urging force of the elastic means 7 is released and the hard crawler 5 is lowered. Furthermore, the operation piece 9 can be moved to an engagement position where the support lever 4 is held in the raised position by the biasing force of the elastic means 7 when the actuation solenoid 8 is not activated, and a disengaged position where the support lever 4 is evacuated from the downward trajectory. 1. A paper feeder comprising: a control means for causing the actuating solenoid 8 to perform a suction operation each time a sheet of paper on a storage table is fed out;