JPS59185678A - Paper supplying device for printer - Google Patents

Abstract

PURPOSE:To obviate troubles at the time of inserting a paper, guide the paper securely and uniformly and feed it in a correct direction, by a method wherein a paper feeding-in part of a guide member proximate to a pressing position of a paper press roller and a platen is bent so as to be proximate to a circumferential surface of the platen. CONSTITUTION:A guide plate 33 is provided with a plurality of opening parts 33A in the form of not interfering with a lower roller 37 so that the lower roller 37 is pressed against the platen 31 at a meeting point A. The feeding-in side for the recording paper P of one end of the opening parts 33A is bent to the platen 31 side, tip parts of the thus bent part 33B on the feeding-in side are located in proximity to the surface of the platen 31, and the spacing therebetween are uniformly set to be a fixed value in the range of 0.5-2mm.. The discharging side for the paper of the opening parts 33A of the guide plate 33 is slightly bent to the outside, namely, the side opposite to the platen 31 to constitute a bent part 33C on the discharging side. Further, the guide plate 33 is provided with an arcuate cross section, with a predetermined uniform gap between it and the outside peripheral surface of the platen 31, and guides the paper P to a position proximate to a recording surface.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to computer output printers, facsimiles,
The present invention relates to a flixcon feed type paper feeding device in a recording device such as a word processor.

Generally, there is cut paper (cut vapor) as the recording paper used in the above-mentioned paper feeding device, but when loading the recording paper into the above-mentioned paper feeding device, loading the paper for the first time is troublesome, and If the initial paper loading is not successful,
Correct recording will not be possible. Therefore, accurate and stable recording paper loading is extremely important in a recording apparatus. In other words, the paper feeding device of a recording device is designed to be operated easily, quickly, and safely, and to load paper reliably and stably to prevent the occurrence of running surface, jam, slack, wrinkles, etc. of the recording paper, and to maintain stable print quality. This will be explained with reference to FIG. 1, which is a perspective view schematically showing an example of a conventional 7-reaction feed type sheet feeding device, and FIG. 2, which is a schematic cross-sectional view. In the figure, a cylindrical platen 1 for feeding recording paper py is rotationally driven by a drive fiM, for example, a pulse motor or a servo motor, and the shaft of the platen 1 is rotatably supported by a frame 2.

A fixed guide plate 3 for inserting and guiding the recording paper P is fixedly installed at the lower part of the platen 1.
A predetermined gap necessary for guiding the paper P is maintained between the outer peripheral surface of the fixed guide plate 3 and the inner surface of the fixed guide plate 3. Further, in the opening of the fixed guide plate 3 below the platen 1,
A plurality of lower rollers 7 are provided on a rotating shaft 6 suspended between left and right arms 5A and 5B biased by a spring 4.
is in pressure contact with the outer circumferential surface of the platen 1 and is freely rotatable.

Furthermore, a plurality of upper rollers 11 are provided above the front of the platen 1 and are movable in the axial direction and rotatable as a result of a support shaft IO suspended between arms 9A and 9B biased by a spring 8. The upper roller 11 is pressed against the outer peripheral surface of the platen 1. A paper discharge guide plate 12 is provided above the platen 1 to guide the discharge of recorded recording paper P%. The inserter device is a manual paper feed device that is placed above the printer and feeds the cut sheets P one by one.

In the figure, the inserter device is framed by left and right side plates 13 that can be connected to and detached from the left and right frames 2, and two guide bars 14 that are fixed at both ends to the side plates 13 and installed in parallel. A left paper feed guide member 15 , a right paper feed guide member 16 , and an intermediate guide member 17 are shaft-fitted into the guide bar 13 . These guide members 1
5, 16, and 17 each independently correspond to the guide bar 1.
3, and the position is set by sliding left and right according to the recording position and the paper width of the cut sheet P.

The paper feeding angle of each of the guide members 15, 16, 17 is perpendicular or an angle close to this, for example, from the mark to the horizontal line.
is set to .

On the other hand, two guide shafts are installed in parallel at the front lower part of the platen 1. A carriage 21 is provided on these guide shafts so as to be able to reciprocate under the control of a drive source M2 such as a servo motor via a timing belt or wire.

The carriage 21 is shaft-fitted and groove-fitted on the guide shaft 20. At the top of the carriage 21, there are letters,
There are recording heads for recording figures, etc., such as inkjet recording heads, wire dot recording heads, and thermal recording heads.

The n recording curved surfaces are spaced apart from the platen 1 by a predetermined distance.

Next, the procedure for loading recording paper in the feeding device of the printer shown in the above-mentioned conventional example will be explained.

When feeding paper using an inserter device, insert the cut sheet P into the paper feed guide member 15°16 of the inserter device,
For 0 single sheets that are inserted into the slit between 17 and dropped @p
ti is fed into the vicinity of the lower roller 7 by the fixed foot guide plate 3, and is further conveyed and discharged while being held in pressure contact with the lower roller 7 and the upper roller 11, which are in pressure contact with the circumferential surface thereof as the platen 10 rotates.

In such a paper feeding process (1), when paper P is fed from the inserter device, various problems have conventionally occurred when the paper has to enter the pressure contact position between the lower roller 7 and the platen 1. 0 In other words, the paper is not inserted simultaneously and reliably at the pressure contact position (meeting point) K between the platen 1 and the lower roller 7 on both the left and right sides.
There were problems such as paper loss, curling of the paper corners (tonk ear), paper wrinkles, and inability to feed the paper. In this case, paper feeding errors become a big problem. Such paper feeding errors are caused by the following reasons.Firstly, if the gap between the fixed guide plate 3 and the platen 1 is too wide,
Depending on the texture of the paper, the leading edge of the paper may be wavy.
When pressed against the lower roller 7, paper wrinkles etc. occur. If the gap is too narrow as shown in FIG. 2, the paper may not reach the platen 1 or the lower rough surface, or may reach only one side, resulting in failure to feed, paper whitening, and curled corners of the paper. Furthermore, if the friction coefficient of the lower roller 7 is too small, the paper will slip and not be fed, and if it is too large (0.6 or more), if it is inserted crooked, it will be caught and fed crooked. Become.

In order to prevent these drawbacks, there are cases where conveyor belts, movable paper feed guide plates, special feeding members, etc. Not suitable for reliability.

OBJECTS OF THE INVENTION The object of the present invention is to solve the troubles encountered when inserting paper in a conventional Flixcon feed type paper feeding device for single-cut recording paper, to capture the paper reliably and uniformly, and to convey it in the correct direction. Furthermore, the purpose is to make the organization vote-counting.

Structure of the Invention The paper feeding device of the present invention is a friction feed type paper feeding device, and includes a platen that feeds recording paper along its circumferential surface, and a pressure-contact clamp for the recording paper on the circumferential surface of the platen. In a paper feeding device for a printer, which is composed of a paper holding roller that presses the paper, and a guide member that guides and feeds the recording paper.
The paper feeding portion of the guide member near the pressure contact position between the paper pressing roller of the guide member and the platen is bent so as to be close to the circumferential surface of the platen.
In addition, the distance between the bent tip of the guide member and the circumferential surface of the platen is set in the range of 0.5 to 2 m, and the friction coefficient of the paper pressing roller is set to Q, 1 to 0.5, preferably 0. By setting the value between .2 and 0.4, the paper feeding device of the present invention becomes more effective.

Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a sectional view of a main part of a paper feeding device of a printer according to the present invention. FIG. 4 is a perspective view showing the guide member and related members of this paper feeding device.

The paper feeding unit of the paper feeding device according to the present invention mainly includes a platen 31 that drives the feeding of recording paper, and a paper pressing lower roller of the paper feeding unit that presses and clamps the paper on the circumferential surface of the platen 310. 37, and a guide member that guides the paper along the circumferential surface of the platen 310 and near the recording surface.In the figure, 15 is a paper feed guide member of the inserter device. - Reference numeral 11 denotes a paper holding soil roller that is in pressure contact with the platen and rotates as a result of rotation to convey and discharge the paper. In addition, as recording paper, 1
It is possible to use either cut sheets P that are manually fed into sheets, or cut sheets (not shown) that are automatically fed from the paper stacking section by an automatic paper feeder.0 Platen that feeds these recording sheets P. The cylindrical outer circumferential surface of 310 is made of metal, plastic, synthetic rubber, etc., and has an appropriate coefficient of friction 'ft, and the recording paper is tightly wound around this outer circumferential surface and fed.

The center shaft 31A of the platen 31 is rotatably supported by a frame 2 (FIGS. 1 and 2), and at one end thereof a manual rotation knob, a switching clutch, a pulley or gear for electric rotation, etc. are mounted on a shaft. The booster or gear is connected to a drive motor M1, such as a pulse motor or a servo motor, via a belt or gears.

Further, below the platen 31, a plurality of lower rollers 37 are provided on a rotating shaft 36 that is suspended between the left and right arms biased by springs.
It is pressed against the outer circumferential surface of the shaft and can be rotated freely. Regarding the number of rollers 37, the length, number, and total length of each roller are added so that two or more rollers 37 always come into contact when the maximum width or minimum width of recording paper is fed. It is arranged as follows. Further, the length and number of each of the above-mentioned rollers are determined so as to obtain the minimum necessary frictional force to feed the recording paper. This reduces the contact area with the platen 31 (by doing so, even if the platen 31
The lower rollers 37 are arranged in a distributed manner so that even if the rollers 1 and the lower rollers 37 are not parallel to each other, are eccentric, or are slightly shifted around the axis of the lower rollers, the lower rollers 37 are always brought into uniform pressure contact over the entire length.

In this way, the lower roller 37 needs to have appropriate elasticity and friction coefficient in order to press against the platen 31 and feed the recording paper. As mentioned above, the coefficient of friction on the surface of the lower roller 37 should be kept as low as possible, since if it is too large it will cause the paper surface to curl, and the optimal value should be 0.1 to 0.5, preferably 0.2 to 0.4. I found out. This friction reduction effect is made more reliable than paper feeding by the synergistic effect of reducing the gap between the bent tip of the guide plate and the surface of the platen 310, which will be described later. The lower roller M is made of a single material or a multilayer material such as plastic, synthetic rubber, or metal, and its surface is treated to have the above-mentioned coefficient of friction.

Next, the guide plate 33 feeds the recording paper and introduces it to the meeting point A between the platen 31 and the lower roller 37. For cut paper, the inserter device is mounted above the printer and the paper is fed. When the recording paper Pt is inserted into the paper guide members 15 , 16 , 17 and dropped, it is guided to reach the lower end between the guide plates and further enters the meeting point A while contacting the surface of the lower roller 37. .

The guide plate is provided with a plurality of openings 33A in a shape that avoids the lower roller 37Y so that the lower roller 37 comes into pressure contact with the platen 31 at the meeting point A. The opening 33A
One end of the recording paper P is fed from the bra and
The feeding side bent portion 33B is bent toward the balance 31 side.
The leading end of the platen 31 is close to the surface of the platen 31, and the distance therebetween is a constant value within the range of 0.5 to 2 mm, and all the distances are uniform. Further, the paper feed exit side of the opening 33A of the guide plate is formed with an exit side bent portion 33CY that is slightly bent outward, that is, on the opposite side of the platen 310. Further, the guide plate 331-j has an arcuate cross section and guides the recording paper P to the vicinity of the recording surface while maintaining a predetermined equal distance from the outer peripheral surface of the platen 31. The main gap here is 0.5
~2 dishes.

Selection of the other surface material is also easy.

Next, the paper feeding process of the paper feeding device according to the invention will be explained.

First, when the recording paper P is fed using the inserter device, it is inserted and dropped into the slit positions of the paper feed guide members 15, 16, and 17. The inserted recording paper P slides down the lower end of the guide member due to its own weight, descends along the bending part 33B, and touches the tip of the bending part and the platen 31.
The roller passes through a narrow slit between the outer circumferential surface of the lower roller 37 and comes into contact with the outer circumferential surface of the stopped lower roller 37 at a slight angle and stops.

When the paper feed start switch is automatically or manually turned on, the paper feed motor M1 starts rotating by the paper feed drive circuit, and the platen 31 rotates. As a result, the lower roller 37 in the pressed state is driven to rotate, so that the leading edge of the recording paper P, which is in contact with the outer peripheral surface of the lower roller 37 at a slight angle, is rotated by the lower roller 37 due to its own weight and the frictional force of the lower roller 37. It is conveyed on the outer circumferential surface and reaches meeting point A, where it is held in its mouth and conveyed while being crimped.

The leading edge of the recording paper P that has passed through the meeting point A is moved by the new curve section 33C on the downstream side of the opening 33A of the guide plate.
The paper P is fed without being hindered in its progress, and the paper P is fed through the narrow space 1lii between the outer surface of the platen 31 and the guide plate!
yx to the recording surface, further guided by a movable pan (not shown) movable along the outer peripheral surface of the platen 31, and then discharged to the upper roller 11 side. A series of paper feeding operations is completed by opening and closing a lever (not shown) manually or by a motor, solenoid, etc., and sandwiching the paper P between the platen 31 and the paper press rollers 37 and 11.

Effects of the Invention As is clear from the above explanation, according to the present invention, feeding of the recording paper can be reliably stabilized by changing the shape of the guide plate and nine lower rollers.
It has become possible to provide a useful paper feeding device that can exhibit effective feeding effects without increasing costs.

[Brief explanation of drawings]

1 and 2 are perspective views and schematic cross-sectional views of a printer equipped with a friction feed type paper feeding device, and FIG. 3 is a sectional view of essential parts of the paper feeding device of a printer according to the present invention. FIG. 4 is a perspective view showing a guide member and related members of this paper feeding device. 31...Platen 33...Guide member 33
A... Opening part 3313... Inlet side bending part 33C... Outlet side bending part A... Lower roller shaft 37.
... Lower roller A ... Meeting point P ... Recording paper agent Yoshi Kuwahara Beautiful procedural amendment 1. Description of the case 1982 Patent Application No. 61873 2 Name of the invention Printer paper feed device 3 Name of the person making the amendment (127) Roku Konishi Photo Industry Co., Ltd. 4 Agent address 191 Address Sakura-cho, Hino-shi, Tokyo Address 1: 5, Date of the amendment order: 6, Column 7, "Detailed explanation of the invention" in the specification to be amended, Contents of the amendment: The detailed explanation of the invention is amended as follows.

Claims (3)

[Claims] (1) A platen that feeds the recording paper along its circumferential trap; 1. A paper press roller that presses and clamps the recording paper on the circumferential surface of the platen; and a guide that guides and feeds the recording paper. In the paper feeding device for a printer, the paper feeding portion of the guide member near the pressure contact position between the paper pressing roller of the guide member and the platen is bent so as to be close to the circumferential surface of the platen. A paper feeding device for a printer characterized by: (2) a bent tip of the guide member;
2. The paper feeding device for a printer according to claim 1, wherein a distance from the circumferential surface of the platen is in a range of 0.5 to 2 m. (3) The friction coefficient of the paper pressing roller is 0.1 to 0.
5. The paper feeding device for a printer according to claim 1, wherein t is preferably 0.2 to 0.4.