JP2541911Y2 - Automatic paper feeder paper setting mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper setting mechanism of an automatic paper feeder.

[0002]

2. Description of the Related Art The present applicant has developed a paper setting mechanism of an automatic paper feeder shown in a schematic side view in FIG.
32 is a pressure plate, 33 is a device frame, 34 is a pressure plate pressing spring, 35
Is a rotation center of the pressure plate, 36 is a cam fixed to the apparatus by a rotation center 37 of the cam, and 38 is a lock stud fixed to the pressure plate 32.

When setting a sheet on the pressure plate 32, a set lever (not shown) attached to the apparatus is turned to rotate the cam.
The cam 36 is moved to the position shown by the solid line in the figure, the cam 36 is engaged with the locking stud 38 provided on the side of the pressure plate 32, a predetermined number of sheets are set on the pressure plate 32, and then the set lever is set. Turn the pressure plate 32 to the position shown by the broken line in the figure by turning it in the opposite direction to the previous direction, and thereafter press the pressure plate 32 toward the paper feed roller 31 with the pressure plate pressing spring 34, and turn the paper feed roller 31 in the direction of the arrow, The paper is fed using the friction between the paper and the paper.

The cam 36 is shown in an enlarged side view in FIG.
The cam 36 is formed with a concave lock portion 39 that engages with the lock stud 38 and a cam mechanism portion 40 that is proximate to the lock portion 39 and protrudes substantially hemispherically opposite to the lock portion. Cam36
3 and 4, the lock stud 38 is housed in the lock portion 39 and the pressure plate 32 is locked at the paper setting position.

In order to unlock the pressure plate 32 and move it to the paper supply position indicated by the broken line in FIG. 2, the set lever is turned, and the cam 36 is turned counterclockwise around the cam rotation center 37. At that time, the locking stud 38 climbs up the lower part of the cam mechanism 40 in the figure and then descends in the opposite direction, but at this time, the locking stud 38 drops rapidly, whereby the pressure plate 32 moves vigorously, and The paper set in the printer may be disturbed, and a paper feed failure may occur, which may cause paper jamming or skew of the paper.

[0006]

The problem to be solved is that during the process of releasing the locked state of the cam 36 and the locking stud 38 and moving the pressure plate 32 to the paper supply state, the locking stud 38 is moved by the cam mechanism. When the paper passes over 40, it operates rapidly and violently, and the paper set on the pressure plate 32 is disturbed.

[0007]

The present invention includes a pressure plate base, a set lever, a cam, a toggle spring and a stud fixed to a frame of an automatic sheet feeder. When engaged and the pressure plate is locked, when the set lever is moved counterclockwise to disengage the cam from the stud and unlock the pressure plate, the toggle spring applies a force to the cam in the locking direction,
This prevents a force from being applied to the pressure plate when the cam comes out of engagement with the stud.

[0008]

According to the present invention, the locking and unlocking of the pressure plate are performed by the structure of the toggle spring and the arm. The force of the toggle spring is applied in the locking direction, and when the pressure plate is locked, the lock is performed by the force of the toggle spring. When releasing the lock, the set lever is manually operated until the pressure plate completely stops due to the force of the toggle spring, so that the pressure plate does not suddenly move, and the paper set on the pressure plate is removed. The disturbance does not occur, and the stability of sheet feeding is improved.

[0009]

1 and 2 are side views of a paper setting mechanism of an automatic paper feeder according to the present invention.
Is a separation pad, 13 is an apparatus frame, 14 is a pressure plate (pressure plate), 15 is a pressure plate base, 16 is a pressure plate rotation center,
17 is a set lever (this set lever is omitted in FIG. 3), 18 is a cam, 19 is a toggle spring, 20 is a toggle spring first fixed point, 21 is a toggle spring second fixed point, and 22 is a pressure plate base 15.
The stud 23 is fixed to the set lever cam rotation center. In FIG. 2, the separation pad 12 is not shown.

FIG. 1 is a side view when the paper setting mechanism is in a locked state, that is, in a paper supply state (a state in which paper is set). FIG. For example, FIG. 2 is a diagram showing a state when printing is performed. In FIG. 2, the pressure plate 14 has moved from a position shown by a solid line to a position shown by a broken line. In the state of FIG. 1, the pressure plate 14 is not locked, and is in a state of being pressed toward the sheet feeding roller 11 by a pressing spring as shown in FIG.

To lock the pressure plate 14, referring to FIG. 1, when the set lever 17 is rotated clockwise from the state shown in FIG. 2, the free end far from the center of rotation of the cam 18 becomes a stud 22.
And move to the position shown in FIG. During the above-described movement of the set lever 17, the toggle spring first fixed point (hereinafter simply referred to as first fixed point) on the device and the toggle spring second fixed point (hereinafter simply referred to as second fixed point) on the cam 18 are provided. .)
The toggle spring 19 fixed by the above moves from the compressed state of FIG. 2 to the open state of FIG. Therefore, when turning the set lever 17, the urging force of the toggle spring 19 is applied, so that the set lever 17 can be turned smoothly. Platen
A force P shown in the figure is applied to 14 by a pressing spring (not shown). Then, a sheet is set on the pressure plate 14 in this state.

Next, in order to set the unlocked state shown in FIG.
When the set lever 17 is turned counterclockwise, the cam 18 also moves counterclockwise about the rotation center 23. At this time, the toggle spring 19 gives a force opposing the movement of the cam 18, so that even if the set lever 17 is suddenly moved, the movement of the cam 18 becomes a gradual movement, and the cam 18 is disengaged from the engagement with the stud 22. The pressure plate 14 is pressed against the paper feed roller 11 by the force P of the pressing spring as shown in FIG. 2, and when the paper feed roller rotates in the direction of the arrow, the paper is separated from the paper feed roller 11 and the separation pad 12.
It is fed out by frictional force with.

As described above, in the paper setting mechanism of the present invention, when the paper is set on the pressure plate in the locked state of the pressure plate, and then the set lever is manually turned to release the lock, the rapid movement of the cam causes the sudden movement of the cam. Since no force is generated and no sudden force is applied to the pressure plate, the paper set during unlocking is prevented from being disturbed,
Stable paper feed is realized.

[Brief description of the drawings]

FIG. 1 is a side view showing a locked state of a paper setting mechanism of the present invention.

FIG. 2 is a side view showing the unlocked state of the paper setting mechanism of the present invention.

FIG. 3 is a side view showing a conventional paper setting mechanism.

FIG. 4 is an enlarged side view of a cam of the paper setting mechanism of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Paper feed roller 12 Separation pad 13 Device claim 14 Pressure plate 15 Pressure plate base 16 Pressure plate base rotation center 17 Set lever 18 Cam 19 Toggle spring 20 Toggle spring first fixed point 21 Toggle spring second fixed point 22 Stud 23 Set lever cam Rotation center

Claims (1)

(57) [Scope of request for utility model registration] 1. A set lever including a pressure plate base (15) fixed to a frame (13) of an automatic sheet feeder, a set lever (17), a cam (18), a toggle spring (19) and a stud (22). When the (17) is moved clockwise, the cam (18) engages the stud (22), the pressure plate (14) is locked, and the set lever (17) is moved counterclockwise to move the cam (18) to the stud ( To release the pressure plate (14) from the engagement with the pressure plate (14), the toggle spring (19)
(18) gives a force in the locking direction, thereby
A sheet setting mechanism for an automatic sheet feeder, wherein a force is not applied to the pressure plate (14) when the (18) comes out of engagement with the stud (22).