JPS641376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an improvement in the paper feeding mechanism of a paper feeding device attached to a facsimile machine, printer, etc., for feeding sheet paper to a reading section or a printing mechanism.

(b) Background of the Technology Recent facsimile machines and printers have become faster and faster, and replenishing sheets of paper to be sent to the reading section or printing mechanism has become a troublesome task for the operator. Therefore, there is a strong demand for the development of a paper feeding mechanism that can automatically and safely switch between the feeding operation and the replenishment operation of the sheet paper.

(c) Prior Art and Problems FIG. 1 is a diagram for explaining a conventional paper feeding mechanism.

As shown in the figure, the conventional paper feeding mechanism rotates in the direction of arrow A by a motor 6 and a belt 10 while slidingly contacting the sheet paper 2 on the paper feeding table 3 to feed the sheet paper 2 into one sheet.
A paper feed roller 1 feeds the sheet in the direction of arrow A', a spring 4 operates to push up the paper feed tray 3 in the direction of arrow B, and a spring 4 operates to push up the paper feed tray 3 in the direction of arrow B. The push-down arm 5 has a function of rotating in the direction of arrow C and pushing down the paper feed table 3 in the direction of arrow D when replenishing the paper 2.
Then, the sheet paper 2 on the paper feed table 3 is fed out in the direction of arrow A' by the paper feed mechanism, and when it is exhausted, the operator stops the motor 6 and operates the push-down arm 5 to release it. The operation is performed in the following steps: rotating in the direction of arrow C, pushing down the paper feed tray 3 in the direction of arrow D to replenish the sheet paper 2, and then operating the motor 6 again to rotate the paper feed roller 1. It was being done. Therefore, in the conventional paper feeding mechanism, when the sheet paper 2 on the paper feeding table 3 is fed out and runs out, the paper feeding roller 1 and the paper feeding table 3 come into direct sliding contact. Accidents often occurred where both sides were damaged due to friction. It should be noted that it is impossible to provide a separate motor to drive the push-down arm 5 due to the space factor of the device, and it is also undesirable from a manufacturing cost standpoint, so appropriate rationalization measures are a challenge for those involved. was.

(d) Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks of the conventional art. will be on supply standby. This is a feature of the present invention.

(e) Structure of the Invention According to the present invention, this object includes a paper feed roller that is attached to a paper feeder and feeds the sheet paper on the paper feed tray one by one, and a paper feed roller that feeds the sheet paper onto the paper feed tray. A push-down lever that acts to push down the paper feed table during replenishment is connected to a single motor that can rotate in both forward and reverse directions, and the paper feed roller is controlled by controlling the rotating direction of the motor. This is achieved by providing a paper feeding mechanism characterized in that the push-down lever is selectively operated.

(f) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram for explaining one embodiment of the paper feeding mechanism according to the present invention.

As shown in the figure, the paper feeding mechanism of the present invention has a paper feeding roller 1 which is structured to rotate only in the direction of arrow A by a unidirectional first clutch 8, and a paper feeding roller 1 which is rotated in the direction of arrow G by a unidirectional second clutch 9. a paper feed tray 3 equipped with a push-down lever 7 having a structure that rotates only when rotating; an L-shaped hook 11 having one end in contact with the lower surface of the lever 7; ,
A spring 4 pushing up the paper feed tray 3 in the direction of arrow B
and a forward/reverse rotating motor 16 which includes a pulley 17 and rotates in both forward and reverse directions and drives the paper feed roller 1 and the push-down lever 7 via a belt 10, and controls the rotation direction of the motor 16. It is configured by a control mechanism 20. When the sheet paper 2 is placed on the paper feed tray 3, the control mechanism 20 issues a command to the forward/reverse rotation motor 16 to rotate in the direction of arrow E based on the information from the sheet paper sensor 15. Therefore, the motor 1
The pulley 17 of No. 6 rotates in the direction of arrow E, and the belt 10 that transmits the rotation runs in the direction of arrow E', and the feed roller 1 is rotated in the direction of arrow A via the one-way first clutch 8. It rotates, slides into contact with the sheet paper 2 which is pressed against the roller 1 by the spring 4, and sends out the sheet paper 2 in the direction of arrow A'.
In this state, the one-way second clutch 9 is rotated in the direction of arrow H by the belt 10, but since the clutch 9 is a one-way clutch that operates only when rotating in the direction of arrow G, it is idling. It does not act on the push-down lever 7. Next, when the sheet paper 2 on the paper feed tray 3 runs out and needs to be replenished, the sheet paper sensor 15 transmits that information to the control mechanism 20, so the control mechanism 2
0, a reverse command is issued to the forward/reverse motor 16, the pulley 17 of the motor 16 rotates in the direction of arrow F (reverse direction), and the belt 10 transmitting this rotation moves in the direction of arrow F'. Run. As a result, the one-way second clutch 9 is actuated, and the hook 11 in contact with the push-down lever 7 is moved as indicated by the arrow D.
Since the paper feed tray 3 is also pushed down in the direction of arrow D against the spring 4, the sheet paper 2 is brought into a standby state. At this time, the paper feed roller 1 does not rotate and remains stationary because the one-way first clutch 8 is idling and does not operate. When the sheet paper 2 is replenished onto the paper feed table 3, the main paper feeding mechanism resumes its operation and the sheet paper 2 is fed one by one in the direction of arrow A'. As described above, the paper feed mechanism of the present invention has a structure in which the paper feed roller 1 stops rotating and the paper feed tray 3 is pushed down as soon as the sheet paper 2 runs out. The paper feed roller 1 and the paper feed table 3 when the sheet paper 2 runs out
It has a structure that can avoid contact with the paper feed roller 1, and the one forward/reverse rotation motor 16 simultaneously performs both operations of rotating the paper feed roller 1 and pushing down the paper feed tray 3. It is a structure that can be carried out by

(g) Effects of the Invention As explained in detail above, the paper feeding mechanism of the present invention significantly simplifies operator operations by improving the paper feeding structure, improves the safety of the device, and saves space in the device. The effect of improving the factor is also great.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining a conventional paper feeding mechanism.
FIG. 2 is a diagram for explaining the paper feeding mechanism of the present invention. In the drawing, 1 is a paper feed roller, 2 is a sheet of paper, 3 is a paper feed table, 4 is a spring, 5 is a push-down arm,
6 is a motor, 7 is a push-down lever, and 8 is a one-way first
Clutch, 9 is a one-way second clutch, 10 is a belt, 11 is a hook, 15 is a sheet paper sensor, 16
17 indicates a forward and reverse rotation motor, 17 indicates a pulley, and 20 indicates a control mechanism.

Claims (1)

[Scope of Claims] 1. A paper feeding mechanism that feeds a sheet of paper 2 on a paper feed tray to a reading unit, etc., comprising a unidirectional first clutch that operates only when the sheet of paper 2 is driven in a direction to feed out the paper sheet 2. 8, and a unidirectional second clutch 9 that operates only when driven in the direction opposite to the feeding direction of the sheet paper 2.
A push-down lever 7 equipped with a push-down lever 7, a hook 11 that engages with the push-down lever 7 and moves downward when the push-down lever 7 is activated, and a sheet paper sensor 15 that detects the presence or absence of the sheet paper 2 placed thereon.
The rotating direction of the forward/reverse rotation motor 16 which selectively operates the paper feed table 3 which is equipped with a paper feed table 3 and is biased upward by a spring 4, and the paper feed roller 1 and the push-down lever 7 is set to the above-mentioned direction. A paper feeding mechanism comprising: a control mechanism 20 that switches based on information from a sheet paper sensor 15;