JPH02113966A - Paper feed mechanism of sheet feeder - Google Patents

Abstract

PURPOSE:To prevent the engagement of a plurality of gears caused by the reversal of a platen gear by bringing the first idle gear into contact with the same shaft of the second and third idle gears when the first idle gear is rotated in a paper pickup direction and providing a friction roller for rotating the third idle gear in the engaging direction with respect to the first idle gear. CONSTITUTION:After the forward rotation shown by an arrow is given to a platen gear 8 by a discharge order, the platen gear 8 is reversely rotated in the direction shown by an arrow (b) by a suction order to bring the first and second rubber rollers 3, 5 to a contact state. The phase of the notch part 4a of the third idle gear 4 is shifted to engage the idle gear 1 with the idle gear 4. Next, the normal rotation in the direction shown by the arrow (a) is restored to feed paper from a pick roller 11 to a part behind a platen 12 and, further rotating the gear 8 forwardly to discharge the paper from a sheet feeder.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding mechanism for a sheet feeder.

[Prior Art] Conventionally, the paper feeding mechanism of this type of sheet feeder includes a first idle gear that receives power directly from the platen gear, and a first idle gear that receives power directly from the platen gear.
The second idle gear rotates around the first idle gear as a planetary gear. The first idle gear engages with a third idle gear for transmitting power to the big roller having a notch, and the second idle gear transmits power to the discharge roller. It is designed to carry out communication.

During forward rotation, the first eye gear does not engage with the third idle gear, which has a notch, or when the reverse rotation of the suction command is performed, the second idle gear engages with the third idle gear. The first idle gear and the third idle gear are engaged with each other by rotating the notch.

[Problems to be Solved by the Invention] 1- In the conventional sheet feeder paper feeding mechanism described above, during IF rotation, the first idle gear does not engage with the third idle gear having a notch. When the inhalation command is reversely rotated, the second idle gear rotates the third idle gear, causing the notch to be misaligned by (-7), and the first idle gear and third idle gear engage. has become,
At this time, the 1st floor! Since three kinds of idle gears in one direction are engaged, there is a drawback that an excessive amount of power is added to the step motor that sends power to the Braden gear.

[Means for Solving JIa] The present invention was made to solve the above problems, and as a means for solving the problem, the present invention includes a first idle gear that engages with a platen gear fixed to a platen shaft. , a second idle gear for transmitting power to the discharge roller, which is a planetary gear connected by a link around the spindle of the first idle gear; and a pick roller that engages with the first idle gear. and a third idle gear for power transmission to L2.
In the sheet feeding mechanism of the sheet feeder, the third idle gear is provided with a notch part in which the second idle gear disengages from the first eye while transmitting power to the ejection roller side. When the first idle gear rotates in the direction of the paper pickup force, the second idle gear and the third idle gear come into contact with each other, and the third idle gear becomes the first idle gear.
Each of the rollers is provided with a printing roller that rotates in the direction of engagement with the idle gear.

[Example] Next, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing an embodiment of the paper feeding mechanism of the sheet feeder of the present invention, Fig. 2 is a side view showing the initial state of the embodiment, and Fig. 3 is reverse rotation by the suction command of the embodiment. FIG. 4 is a partial sectional view of the same product/lh example, and FIG.
'A(a) is a partial sectional view of the same embodiment, and FIG. 5(b) is a side view [A] of FIG. 5(a).

The paper feeding mechanism of this sheet feeder includes a first idle gear 1 arranged to engage with a platen gear 8, and a first
a link 9 rotating around the main shaft of the idle gear 1;
It is aligned with the second idle gear 2 provided at the end of the link 9.

The second idle gear 2 constitutes a two-stage gear with a first rubber roller fixed coaxially with the second idle gear, and a second eye is formed around the first idle gear l.
- Lugia 2 constitutes a swing gear that rotates as a Tt star gear.

Fourth and first, the configuration of this 11i moving gear is shown.

4 is a third idle gear, 5 is a second rubber roller, and these third idle gear 4 and second rubber roller 5 constitute a two-stage gear fixed on the same axis, and the first idle gear 1 is engaged with a fourth idle gear 6 via this third idle gear 4.

Further, the fourth idle gear 6 is engaged with a big roller 7 that is coaxially provided with a big roller 1 that feeds out the paper.

The configuration of this two-stage gear is shown in FIGS. 5(a) and 5(b). As shown in the figure, a notch 4a is provided in a part of the tooth surface of the third idle gear 4 of the five two-stage gear. Further, an eject roller gear 1O is provided coaxially with the shaft 13 provided with a roller portion for ejecting the paper. Note that 12 is a platen, and 14 is a frame.

Next, the operation of this embodiment will be explained.

First, the initial condition is that the first idle gear 1 and the fourth idle gear
The idle gear 6 is in a position where power cannot be transmitted through the cutout 4a of the third idle gear (see FIG. 2). This initial state is easily reached by rotating the platen gear 8 forward by a certain amount or more in the direction of arrow a. That is, when the platen gear 8 rotates in the forward direction, the rotation is transmitted to the first idle gear 1 that engages with the platen gear 8. However, when the notch of the third idle gear 4 faces the first idle gear 1, power transmission stops and only the first idle gear 1 rotates.

Now, when a paper suction command is received, the platen gear 8 rotates in the opposite direction in the direction of the arrow, and the first rubber roller 3 of the swing gear consisting of the first idle gear 1, the second idle gear 2, and the first rubber roller rotates. When the third idle gear 4 moves to a position where it contacts the second rubber roller 5 and continues to rotate in the opposite direction, the third idle gear 4 moves to a position where it engages with the first idle gear 1 (see FIG. 3).

Next, when the rotation of the platen gear 8 is changed to normal rotation in the direction a, the second idle gear 2 is transmitted to the eject roller gear 10 fixed coaxially with the eject roller.

Also, when the first idle gear 1 and the third idle gear 4 engage and rotate, power is applied to the pick roller gear 7 provided coaxially with the pick roller 11 that feeds out the paper via the fourth idle gear 6. Communicate and keep the paper constant! +1 feed, Fj and gear train return to initial state.

As explained in the following F order, after giving the forward rotation in the direction of the arrow a with the ejection command, by giving the reverse rotation in the direction of the arrow A with the suction command, the first and second rubber rollers 3 and 5 come into contact, The phase of the notch 4a of the third idle gear 4 is shifted, and the first idle gear 1 and the third idle gear 4 engage with each other,
Next, by returning to normal rotation in the direction of arrow a, the sheet is fed from the big roller 11 to the rear of the platen 12, and by further rotation in the normal direction, the sheet is ejected from the sheet feeder.

[Effects of the Invention] As explained above, the paper feeding mechanism of the sheet feeder of the present invention has a first mechanism that engages with a platen gear fixed to a platen shaft.
A second idle gear for transmitting power to the discharge roller, which is a planetary gear connected by a link around the spindle of the first idle gear, is engaged with the first idle gear. No. 3 for transmitting power to the big roller
an idle gear, and a cutout part is provided in a part of the third idle gear for disengaging the second idle gear from the first idle gear while the second idle gear is transmitting power to the discharge roller side. In the paper transport mechanism, - when the first idle gear is coaxially connected to the second idle gear and the third idle gear and rotates in the paper pickup direction, the first idle gear contacts the third idle gear and the first idle gear; Since the configuration is such that each Pj rubbing roller is provided to rotate in the engagement direction, the reverse rotation of the platen gear is used as a trigger to prevent multiple gears from engaging, and the load on the motor is reduced by letting the rubber rollers idle. It has the effect of being able to be absorbed.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a perspective view showing one embodiment of the paper feeding mechanism of the sheet feeder of the present invention, Fig. 2 is a side view showing the first 1111 state of the same embodiment, and Fig. 3 is the same. FIG. 4 is a partial sectional view of the embodiment; FIG. 5(a) is a partial sectional view of the embodiment; FIG. 5(b) FIG. 5(a) is a side view of FIG. 5(a); 1: First idle gear 2: Second idle gear 3 'fJl rubber roller 4 Near 83 eye torque 4a: Notch 5: Second rubber roller 6: Fourth idle gear 9: Link 11: Big roller 12 Nibraten

Claims (1)

[Claims] A first idle gear that engages with a platen gear fixed to a platen shaft, and a second idler for transmitting power to the discharge roller, which is a planetary gear connected by a link around the support shaft of the first idle gear. gear, and a third idle gear for transmitting power to the pick roller that engages with the first idle gear, and a second idle gear is provided on a part of the third idle gear on the side of the discharge roller. 1st during power transmission
In the sheet feeder paper feeding mechanism provided with a notch for disengaging from the idle gear, the first idle gear rotates in the paper pickup direction coaxially with the second idle gear and the third idle gear. A paper feeding mechanism for a sheet feeder, characterized in that each friction roller is provided with friction rollers that come into contact with each other and rotate the third idle gear in the engaging direction with respect to the first idle gear.