JPS63127938A - Paper feeder - Google Patents

Abstract

PURPOSE:To keep off any frictional coloring on a thermosensible chart, by pushing up a chart receiving plate, where a part of the chart feeding side installed in the bottom of a cassette moves up and down, and pressing a top face of the chart to a feed roller, while regulating height of the chart top with a claw. CONSTITUTION:A receiving plate 18 of a chart 11 is installed on the bottom of a cassette 10, and a part at the side of a feed roller 13 is made movable up and down. With a decrease of the chart 11, the receiving plate 18 is made to go up by a spring 19, and the chart 11 is pressed to the feed roller 13. On the other hand, each regulating member 20 installed at both sides of the cassette 10 is made rockable around a fulcrum shaft 20b of a side plate 17a, and height of the chart 11 is regulated by the claw 20a bent inward. The regulating member 20 is balanced in advance so as to cause the claw 20a to be made lightly contact with the chart 11 when the chart 11 is loaded on the receiving plate 18. A rear end 20d of the regulating member 20 comes into contact with a bottom plate 17b of the cassette 10, restricting an upward movement of the claw 20a. With this constitution, pushing force between the chart 11 and the feed roller 13 is reduced, thus any coloring due to friction of the thermosensible chart is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device of a paper feeding cassette type in a recording apparatus.

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, this type of device has a paper feed cassette 2 which overflows a cassette guide 1 of a recording device and is removably loaded in a paper feed position, and a paper feed cassette 2 which is removably loaded into a paper feed position. The paper feed cassette 2 has a paper feed row 24 that feeds the topmost recording paper by contacting the upper surface of the recording paper 3 in the paper cassette 2. a lift plate 6 that is swingably provided at the bottom of the recording paper and supports the bottom surface of the recording paper;
a spring 7 that pushes up the recording paper 3 thereon and presses the recording paper 3 thereon against the paper feed roller 4; a pair of claws 8 that are arranged near both ends of the front end of the recording paper 3 in the feeding direction and whose tips are bent toward the upper surface of the recording paper; It has a side plate 9 that guides the side edge of the recording paper. In this paper feeding device, the recording paper 3 in the paper feeding cassette 2 is pressed against the paper feeding roller 4 by a spring 7, and is sequentially fed out one by one by the rotation of the paper feeding roller 4, and is moved to a recording position (not shown). will be sent to. Here, since claws 8 are provided near both ends of the front end of the recording paper 3, the recording paper 3 fed out from the paper feed cassette 2 passes through the claws 8 with both ends deformed greatly. The recording paper 3 that is fed out is separated from the recording paper below it, and only a single recording paper is fed out. Note that the claw 8 not only functions to separate the recording paper as described above, but also prevents the top surface of the recording paper from protruding slightly above the main body box 5 before the paper feed cassette 2 is loaded into the recording apparatus. It also serves to regulate the position of the top surface.

Problems to be Solved by the Invention However, with this configuration, when heat-sensitive cut paper is used as the recording paper, there is a problem in that a portion of the heat-sensitive cut paper that is fed out becomes colored.

As a result of investigating the cause of the above-mentioned problem, the inventors of the present invention found that this coloring is caused by the pressure between the paper feed roller and the recording paper. That is, in the conventional device, in order to feed out the recording paper in the paper feed cassette, the recording paper must be deformed at the claw 8 and passed through. Therefore, it is necessary to apply a large conveying force to the recording paper. , the pressing force between the paper feed roller and the recording paper by the spring is increased. Therefore, at the paper feed roller position, a large pressing force is applied between the recording paper being fed out and the recording paper below it, and between the recording paper being fed out and the recording paper below it. A large frictional force was applied, causing frictional coloring to occur on the lower recording paper.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cassette-type paper feeding device that can sequentially feed heat-sensitive recording paper one sheet at a time without causing frictional color development. do.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides claws for regulating the upper surface position of the recording paper stored in the paper feed cassette, which are arranged on both sides of the recording paper in the feeding direction. However, the recording apparatus is provided with a separation mechanism for separating double-fed recording paper from the paper feed cassette.

Function The present invention eliminates the need to deform the recording paper when feeding the recording paper by disposing the claws for regulating the upper surface position of the recording paper not at the front end of the recording paper but on both sides of the recording paper as described above. This eliminates the need for the paper feeding roller to carry the recording paper, so the pressing force between the recording paper and the paper feeding roller can be reduced compared to before, and the frictional force between the recording paper and the recording paper is small. This makes it possible to feed heat-sensitive recording paper without coloring due to friction. Note that even if the paper feed roller double-feeds the recording sheets, the separation mechanism separates the sheets, so that only a single recording sheet can be fed to the recording position.

Example Hereinafter, the present invention will be described in detail as shown in the drawings.

FIG. 1 is a schematic sectional view showing a paper feeding device according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view of a paper feeding cassette used in the embodiment. In the figure, 10 is a paper feed cassette that stores recording paper 11 such as thermal cut paper, 12 is a cassette guide that guides the paper feed cassette 10 to the paper feed position of the recording device, and 13 is a paper feed cassette loaded in the paper feed position. A paper feed roller that contacts the recording paper 11 in the paper feed cassette 10 and feeds the recording paper from the paper feed cassette; 14 is a conveyance roller that further conveys the recording paper fed out by the paper feed roller 13; 15 is a conveyance roller; This is a separator that constitutes a separation mechanism that separates double-fed recording paper from a paper feed cassette.

The paper feed cassette 10 includes a main body box 17 that stores the recording paper 11.
A recording paper receiving plate or lift plate 18 is disposed at the bottom of the main body box 17 to support the bottom surface of the recording paper and whose portion on the feeding direction side is movable in the vertical direction. It has an elastic member 19 such as a coil spring, and a regulating member 20 that contacts the upper surface of the recording paper 11 pushed up by the elastic member 19 and regulates the upper surface of the recording paper to a predetermined height. The regulating members 20 are arranged on both sides of the recording paper 11 in the feeding direction, and have claws 20a bent so as to contact the upper surface of the recording paper 11. Guide main body box 17
It is swingably held on the side plate 17a of the body via a support shaft 20b.

Further, the regulating member 20 is balanced so that the claw 20a lightly contacts the recording paper 11 when the recording paper 11 is loaded on the lift plate 18. The front portion 20C of the regulating member 20 is bent in front of the recording paper 11 to prevent the recording paper 11 from falling out when the paper feed cassette 10 is moved. However, when the paper feed cassette 10 is loaded in the paper feed position of the recording device, the height of the folded front portion 20C is adjusted so as not to cause any problem in feeding out the topmost recording paper. It is lowered by the thickness of the top few layers. The rear end 20d of the regulating member 20 also extends rearward than the support shaft 20b, and the claw 20a
When it rises, it hits the bottom plate 17b of the main box 17,
The lifting position of the claw 2 (l) is regulated. Normally, the lift plate 18 and the recording paper 11 are pushed upward by the elastic member 19, and the top surface of the recording paper is maintained at a predetermined height position determined by the claw 20&. Note that the upper limit position of the claw 20a is when the uppermost surface of the recording paper 11 is pressed against the paper feed roller 13 by the elastic member 19 when the paper feed cassette 10 is loaded in the recording apparatus as shown in FIG. It is established that it is allowed to be

Here, the paper feeding roller 1 of the recording paper 11 by the elastic member 19
The pressing force applied to the paper feed roller 13 is set to the minimum value that allows the paper feed roller 13 to feed out the recording paper 11 without slipping.

A presser pin 21 constituting a cam follower is fixed to the side surface of the regulating member 20. On the other hand, at the cassette loading position of the recording apparatus, a cam 22 is provided at a position that engages with this presser pin 21 while the paper distribution cassette 10 is being loaded and moved. This cam 22 engages with the presser pin 21 during the loading movement of the paper feed cassette 10 and displaces the claw 20a of the regulating member 20 inward of the main body box. It is shaped to release the pin 21.

Next, the operation of the paper feeding device having the above structure will be explained.

As shown in FIG. 2, recording paper 11 is stored in paper feed cassette 10. As shown in FIG. The front end side of this recording paper 11 has an elastic member 19 (
(see FIG. 1), but its top surface is restrained by the claws 20a of the regulating member 20 and maintained at a predetermined height position. This paper feed cassette 10 is
In the figure, the cassette is inserted into the cassette guide 12 from the right side of the figure. During this insertion, the presser pin 21 is inserted into the cam 22.
When the paper feed cassette 10 is inserted, the claw 20 of the regulating member 20 is pushed down by the inclined surface 22a.
a moves downward and pushes down the recording paper 11 against the force of the elastic member 19. Thereafter, the presser pin 21 moves while being restrained by the lower surface 22b of the cam 22, so that the upper surface of the recording paper 11 is kept pressed down by the claw 20a and comes into contact with the paper feed roller 13 which is fixed at a predetermined position. It is inserted under it without doing anything. When the paper feed force section 10 is inserted to a predetermined position, the presser pin 21 passes through the lower surface 22b of the cam 22 and is no longer restrained by the cam 22. is pushed up, and the recording paper 11 is pressed against the paper feed roller 13, making it possible to feed the paper.

Thereafter, as the paper feed roller 13 rotates, the recording paper 11 is fed out one by one from the top, and is fed to the recording position in the recording apparatus via the conveyance roller 214.

At this time, as the recording paper 11 is fed out, the paper feed cassette 10
Even if the number of recording sheets 11 inside decreases, the lift plate 1
8 is pushed up by the elastic member 19 and presses the recording paper 11 against the paper feed roller 13, so the recording paper 11 is fed out one after another. Here, a claw 20 is attached to the recording paper 11 fed out from the paper feed cassette 10 by the paper feed roller 13.
a are only lightly in contact with each other, and as in the conventional apparatus shown in FIGS. 3 and 4, the pawl 8 is positioned in front of the recording paper in the feeding direction, and the recording paper passes through the position of the pawl 8. Since the structure is different from the one that requires a large deformation, the conveying force for feeding the recording paper 11 can be extremely small;
Even if the pressing force on one paper feed roller 13 is extremely small, the recording paper 11 can be fed without the paper feed row 213 slipping. Therefore, the pressing force of the recording paper 11 against the paper feed roller 13 by the elastic member 18 is set to be extremely small. As a result, the frictional force between the recording paper fed out by the paper feed roller 13 and the recording paper stationary below is small, and even when heat-sensitive cut paper is used as the recording paper, the There is almost no friction coloring on the paper.

Note that a plurality of sheets of recording paper may be fed simultaneously by the paper feed roller 13, but when the double-fed recording sheets pass the conveyance roller 14, the second and subsequent recording sheets are separated from the top by the separator 15. This prevents double feeding of recording paper.

In the above embodiment, the regulating member 20 for regulating the upper surface position of the recording paper 11 is provided to be swingable by the support shaft 20b, and the paper feeding cassette 10 is fixed by the cam 22 and the presser pin 21.
When loading the recording paper, it automatically swings and pushes down the top surface of the recording paper.
Although the regulating member 20 is configured to be inserted under the paper feed roller 13, it is not necessarily necessary to make it swingable.
It may also have a structure fixed to the main body box. However, in that case, when loading the paper feed cassette 10, the paper feed roller 13 may be raised manually or by an appropriate mechanism to a position that does not interfere with the insertion of recording paper into the paper feed cassette. After loading the paper cassette, it is necessary to return it to its original position.

Effects of the Invention As is clear from the above description, the present invention provides the following advantages by arranging claws on both sides of the recording paper in the feeding direction for regulating the upper surface position of the recording paper stored in the paper feeding cassette. It is possible to reduce the conveying force required to feed the recording paper and reduce the pressing force between the recording paper and the paper feed roller. It has the effect of being able to prevent frictional coloring, and also being able to prevent double feeding of recording paper by providing the recording device with a separation mechanism that separates the recording paper that is double fed from the paper feed cassette. It is something.

Note that, as shown in the illustrated embodiment, the regulating member 20 is connected to the support shaft 2.
0b, and the cam 22 and presser pin 21 are configured to automatically swing and push down the top surface of the recording paper when the paper feed cassette 10 is loaded and moved.
When the paper feed cassette 10 is inserted, the upper surface of the recording paper is automatically pushed down, and the paper can be inserted under the paper feed roller 13 provided at a fixed position without any trouble.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a paper feeding device according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a paper feeding cassette used in the embodiment, and FIG. 3 is a schematic diagram showing a conventional paper feeding device. cross section,
FIG. 4 is a schematic perspective view of a paper feed cassette used in the paper feed device. 10... Paper feed cassette, 11... Recording paper, 12...
・Cassette guide, 13...Paper feed roller, 14...
Conveyance roller, 15...Separator, 17...Main box, 18...Lift plate, 19...Elastic member, 20...
- Regulation member, 20a...claw, 20b...support shaft.

Claims (2)

[Claims] (1) A paper feed cassette that is removably loaded in the paper feed position of the recording device, and a paper feed cassette that feeds the paper by contacting the top surface of the paper in the paper feed cassette loaded in the paper feed position. The paper feed cassette includes a paper roller and a separation mechanism that separates the double-fed recording paper from the paper feed cassette. a recording paper receiving plate which is provided to support the recording paper and whose portion on the feeding direction side of the recording paper is movable in the vertical direction; and the recording paper receiving plate is pushed upward and the upper surface of the recording paper is pressed against the paper feeding roller. It has an elastic member and a regulating member that comes into contact with the upper surface of the recording paper pushed up by the elastic member and regulates the upper surface of the recording paper to a predetermined height. A paper feeding device comprising a claw arranged and bent so as to come into contact with the upper surface of the recording paper. (2) The regulating member is swingably held relative to the main box so that the claws of the regulating member can move downward from a position that regulates the top surface of the recording paper to a predetermined height. A paper feeding device according to claim 1.