JPH02106526A - Sheet lifting device - Google Patents

Abstract

PURPOSE:To constrain the oblique movement of a sheet by vertically oscillatingly supporting the lift plate where sheets are laminatingly placed, and facingly arranging a sheet supply roller on the upper part in the freely oscillating end side of the lift plate in the automatic sheet supply device equipped to a printer. CONSTITUTION:Laminated sheets 1 are pushed to a sheet supply roller 5 group rotatingly oscillating from the lower part due to the ascending oscillation of a lift plate 2, and the uppermost sheet of the sheets 1 is delivered in order by the drive of the roller 5 group. Since a rack 10a is tilted in the direction to near an alignment front plate 21 to ascend, the lift plate is pulled forward with its ascending while its rear end is being slided to a supporting point axis 4, and the interval between the front end of the plate 2 and the plate 21 is always kept nearly constant. When the sheets are delivered by rotating the roller 5 in this condition, since the front end of the sheets 1 are seldom bent into the said interval, the sheets 1 are smoothly delivered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a paper lift device in an automatic paper feeder (auto cut sheet feeder) that is applied to a printer. A paper structure in which a lift plate to be stacked is supported so as to be able to swing up and down, and paper feed rollers are arranged facing each other at the upper part of the free swinging end of the lift plate, so that the stacked papers can be sent out in order from the top layer. This invention relates to a lift device.

[Conventional technology]

In a conventional paper lift device of this kind, a lift plate is supported so as to be able to swing freely around the end opposite to the paper feed roller, and the paper stacked on the lift plate is transferred to the paper feed roller by the swinging. It is pressed into contact.

[Problem to be solved by the invention]

By the way, as described above, in the conventional structure, since the lift plate has a swing center, the free end of the lift plate moves up and down in an arc. For this reason, the distance between the alignment front plate that abuts and aligns the front edges of the laminated paper and the free end of the lift plate is
The size increases as the lift plate swings upward. The stacked paper is pushed up with its front end in contact with the alignment front plate, and the distance between the alignment front plate and the riff N7i increases, so
The leading edge of the paper is deflected into the gap. Furthermore, due to variations in the friction between the sheets and between the sheets and the pre-alignment plate, the leading edge of the paper does not uniformly abut against the pre-alignment plate over the entire width direction. For this reason, when the paper feed roller feeds the paper one by one, the paper tends to be tilted.

The present invention aims to eliminate the above-mentioned disadvantages.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a laminated RN structure for paper sheets.
A lift plate is supported so as to be able to swing downwards -L, and paper feed rollers are arranged facing each other at the upper part of the free swinging end of the lift plate, and the front ends of the stacked sheets are aligned in front of the free swinging end of the lift plate. A paper lift device is provided with a front alignment plate for stacking paper sheets and is configured to send out stacked paper sheets in order from the top layer.The paper lift device has the following configuration.

That is, the paper lift device according to the present invention includes a supporting means for slidably supporting the swinging base end of the lift plate in the paper feeding direction, and while the swinging free end of the lift plate swings up and down. A guide means for guiding the swinging free end of the lift plate so as to maintain a substantially constant distance between the swinging free end of the lift plate and the alignment front plate.

[Effect]

In the above configuration, when the laminated paper is fed out one by one and decreases, the lift plate swings upward so as to push up the paper. Further, as the lift plate moves upward, the swinging base end portion slides in the front-rear direction and is guided such that the free swinging end is spaced from the alignment front plate by a substantially constant distance G. .

As a result, the front edge of the paper is less likely to be bent between the 1st rift and the 4kj before alignment, and when the paper is fed out by the paper feed roller, the paper is fed out smoothly, and both left and right edges of the paper are The resistance is less likely to be non-uniform, and the skew of the paper can be suppressed.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 4 show an embodiment of a paper lift device according to the present invention.

Paper l is loaded on a lift plate 2. The rear edge of the lift plate 2 in the paper feeding direction is bent into a U shape, and the left and right sides of this bent edge 2a are a pair of left and right frame walls 6a, a fulcrum horizontally protruding concentrically inward from (ib). The lift plate 2 is supported by a shaft 4.4 so as to be movable up and down around the fulcrum shaft 4, and to be slidable back and forth within the U-groove range of the bent edge 2a.

Above the front end (swinging free end) of the lift plate 2, a plurality of paper feed rollers 5 are mounted on both left and right frame walls 5a.

6b, and is pressed from below against a group of paper feed rollers 5 which are rotatably driven by the upward swinging of the lift plate 2, and the uppermost layer of the stacked paper 1 is driven by the group of paper feed rollers 5. It is configured to be sent out in order from

A lift shaft 7 is horizontally connected to the front lower side of the lift plate 2.
Both ends of this lift shaft 7 are frame walls 6a.

A pair of left and right lift plate elevating mechanisms 9A and 9B are provided which are guided and passed through vertically movably along a vertical elongated hole 8 formed in 6b, and which support both ends of the lift shaft 7 and drive it up and down. .

Each lift plate elevating mechanism 9A, 9B is composed of racks 10a, 10b pivotally connected to both ends of the lift shaft 7, and binions lla, llb that mesh with the racks 10a, 10b.
Upper and lower elongated holes 12a formed in 0a and 10b.

Guide bins 13a and 13b protruding from the frame walls 6a and 6b are engaged with the guide bins 12b, and the binions l1a1],
The lift plate 2 is driven to swing vertically by vertically moving the racks 10a, . The lift plate elevating mechanisms 9A and 9B are interlocked so as to operate synchronously via an interlocking mechanism described below.

This interlocking mechanism includes a large diameter gear 14a integrated with the pinion lla of the lift plate elevating mechanism 9 on the left side, a large diameter gear 14b integrated with the pinion llb of the lift plate elevating mechanism 9B on the right side, and large and small gears. The two left and right intermediate reduction gears 15a, 15b, the two left and right interlocking gears 19a, 19b driven by the intermediate reduction gears 15a, I5b, and the re-interlocking gears 19a, 19b are attached to both ends of the lift plate. 2 and a rotating shaft 20 that crosses the lower side of the rotary shaft 2.

Then, the binion lla of the left lift plate elevating mechanism 9A
The large diameter gear 14a integrated with the intermediate reduction gear +5a is meshed with the small diameter gear 16a of the intermediate reduction gear 15a, and the large diameter gear 16at of the intermediate reduction gear 15a is connected to the output gear 18 of the motor 17 attached to the outer surface of the left frame wall 6a. , and the interlocking gear 19a are in mesh with each other. On the other hand, the large diameter gear 14b integrated with the binion llb of the right lift plate elevating mechanism 9B is meshed with the small diameter gear 16b of the intermediate reduction gear 15b, and the large diameter gear 16bt of the intermediate reduction gear 15b is engaged with the interlocking gear 19b.
are engaged.

By the way, in front of the front end of the lift plate 2, there is an alignment front plate 2 fixed across the left and right frame walls 6a and 6b.
1 is provided. Since the lift plate 2 is inclined so that its front end is lowered, the sheets 1 stacked on the lift plate 2 are aligned with their front ends abutting against the front alignment plate 21 due to their own weight. Frame wall 5a.

6b long hole 8. The upper ends of the racks lQa, 10b and the long holes 12a, 12b of the racks are inclined forward in a direction approaching the front alignment plate 21, respectively. The rack 10a.

10b and the gear train are covered against the paper 1 on the lift plate 2 by covers 3a, 3b fixed to the frame walls 6a, 6b.

Next, the operation of the paper lift device described above will be explained.

First, when the motor 17 rotates the left intermediate reduction gear 15a in the counterclockwise direction in FIG.
At the same time, the power is transmitted to the left interlocking gear 19a and the rotating shaft 20 through the large diameter gear 16at of the intermediate reduction gear 15a. The interlocking gear 19b on the right side is driven. The interlocking gear 19b on the right drives the large diameter gear 16b8 of the intermediate reduction gear 15b on the right, thereby driving the small diameter gear 16 of the intermediate reduction gear 15b.
The right-hand binion llb is driven via b. In this way, the left and right binions lla, Ilb are connected via the left and right interlocking gears 19a, , 19b and the rotating shaft 20.
Since the racks 10a and IOb are simultaneously driven, the front end of the lift plate 2 is moved to the fourth position by the lift shaft 7 connected to the lower ends of both racks 10a and IOb.
It is raised as shown by the two-dot chain line in the figure.

At this time, if the lift plate 2 were to only swing around the rear end as a fulcrum as in the past, the front end of the lift plate 2 would be spaced apart from the alignment front plate 21 as it rose; however, in the embodiment of the present invention, the rack 10a and 10b are tilted upward in the direction approaching the front alignment plate 21, so as the lift plate rises, it is pulled forward while sliding its rear end with respect to the fulcrum shaft 4.
The distance between the front end of the lift plate 2 and the front alignment plate 21 is always kept substantially constant. In the above state, when the paper feed roller 5 is rotated to feed out the paper, the front end of the paper 1 is rarely bent into the above-mentioned interval, so the paper 1 is smoothly fed out. Moreover, the paper is less likely to be skewed due to the difference in curvature between the left and right ends, unlike in the conventional case.

Contrary to the above, when the large diameter gear 16a is rotated clockwise in FIG. , Ilb are interlocked, so that the racks 10a and 10b are lowered simultaneously, and the front end of the lift plate 2 is lowered via the lift shaft 7 as shown by the solid line in FIG.

In this way, the swinging front end of the lift plate 2 can be raised and lowered by the pair of left and right racks 10a, 10b and the lift shaft 7 that connects them without tilting in the width direction.

Note that the interlocking mechanism for synchronously raising and lowering the lift plate elevating mechanisms 9A and 9B is not limited to the configuration described in the above embodiment, and may be realized by other configurations.

〔Effect of the invention〕

As explained above, according to the present invention, the free swinging end is aligned with the front plate while the temporary lift slides the swinging base end in the front-rear direction along with its upward movement, and the corner between it and the front plate is almost constant. By being guided so that the front edge of the paper is bent between the lift plate and the alignment front plate, the paper is fed out smoothly when fed by the paper feed roller. At the same time, the resistance is less likely to be uneven on both the left and right ends of the paper, and skewing of the paper is suppressed.

[Brief explanation of the drawing]

1 to 4 relate to one embodiment of the present invention;
The figure is a perspective view showing the main parts of the paper lift device, Fig. 2 is a partially cutaway plan view, Fig. 3 is a partially cutaway side view, and Fig. 4 is a sectional view taken along the line IV-rV in Fig. 2. be. l...Paper, 2...Lift board, 4
...Supporting means (fulcrum shaft), 21...Alignment front plate, 7,
8.12a, 12b, 13a, 13b-guiding means (lift shafts, slots, pins).

Claims (1)

[Claims] (1) A lift plate on which paper is stacked is supported so as to be able to swing up and down, a paper feed roller is placed opposite to the upper part of the free swinging end of the lift plate, and the sheets are stacked in front of the free swinging end of the lift board. In a paper lift device that is configured to have an alignment front plate for aligning the front edges of the paper sheets and to feed stacked sheets of paper in order from the top layer, the swinging base end of the lift plate is slid in the paper feed direction. A support means that freely supports the lift plate, and a swinging mechanism for swinging the lift plate such that while the swinging free end of the lift plate swings up and down, the distance between the swinging free end of the lift plate and the alignment front plate is kept approximately constant. A paper lift device comprising: a guide means for guiding a free end; and a paper lift device.