JPS5842546A - Paper feed mechanism in small sized printer - Google Patents

Abstract

PURPOSE:To provide a small sized printer with a paper feed mechanism which enable the printer to be of a low price, by constituting the paper feed mechanism such that the mechanism has a paper feed roller made of rubber, a paper holding roller abutted thereto and a paper guide member biased in a predetermined direction by a spring so that the conventional levers or the like are eliminated. CONSTITUTION:In case of the printer in which a printing type 281 is stopped to a selected printing position and is then, pushed by a printing roller 31 through an ink ribbon 32 and a printing sheet 25 onto which letters are thereby printed, a paper feed shaft 21 onto which a paper feed roller 22 is fitted at the substantially middle section thereof, is rotatably journalled to a frame 20. Further, paper guides 23, 24 which are slidable in the direction of (d) when a pin 202 is engaged in a groove 231, are mounted to the frame 20 in a spaced relation, and a paper holding roller 26 is rotatable journalled to a receiving part 233 of the paper guide 23. Further more, the paper guides 23, 24 are biased by a spring 35 in such a direction that the paper holding roller 26 is pushed against the paper feed roller 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer, and relates to a printing paper tube feeding structure.

About the paper feeding mechanism of conventional small printers! This will be explained using diagram lII.

l is the frame, 2 is the paper feed shaft, and there is a general hole 1 in the frame 1.
It is rotatably supported on a shaft at 07. Reference numeral 3 denotes a paper feed a-ra, which is made of rubber and fixed to approximately the center of the paper feed shaft 2 with adhesive. The 4Fi paper plan is for tomorrow use *401.4
02 are respectively placed in frame 1 and bins 101 and 102.
I'm completely absorbed in it, and I can't stand it. 5 paper guide B, $501.502 for Tori 9 is tL7 Ray AIK@
7'l: Bin 103.104tC#it/% entry is fixed.

17Fi is a printing paper regulating member that has a part welded to the paper draft circle 4 and has a spring property to move the printing paper 16 away from the type ring 10 and to work without causing dirt such as scratches. be. 6
is a paper presser lever, and the paper presser roller 7 is rotatably supported on a shaft at the front, and the paper presser lever itself is rotatable about a fulcrum 601, and is attached to a spring 8 in the direction of arrow G. is constantly energized. 9 is a release lever, which is rotatably mounted on a bin 105 provided on the frame;
A portion 901 is engaged with the paper presser lever 6. IO is a type ring with type 11 on the surface. 12 is L to the motor
The rotating printing shaft 13 is a printing roller support that rotatably supports the printing roller 14, and rotates in synchronization with the printing shaft 12. Reference numeral 15 denotes an ink ribbon, which is inserted into a groove provided in the frame. In such a configuration, the printing paper 16 passes between the paper guide ram 4 and the paper guide B5, is pressed by the paper feed roller 53 and the paper presser roller 7, and passes between the ink ribbon 13 and the print "-914. street, 7 rem 1
Go outside and b. Select and stop the type 11 at the printing position,
When the printing roller 4 presses the type 11 via the ink ribbon 13 and the printing paper 16, characters are printed on the printing paper 16. After this, if the busy paper feed shaft 2 is rotated by a predetermined angle w. , the printing paper 16 Fi, Ji is fed by a fixed amount due to the frictional force with the feed row 53. To freely pull out the printing paper 16 back and forth, rotate the release lever 9 in the direction of the arrow.
By rotating the paper presser lever 6 in the direction of arrow C, the paper presser roller 7 is released from the paper feed roller 3, thereby freeing the printing paper 16. At this time, if the printing paper 16 is pulled forward 11, it will come out freely.

In such a structure, it is efficient for the direction of the pressing force of the paper presser L-rough to face the center of the paper feed roller 3, but
It is desirable that the fulcrum 601 of the paper presser lever is perpendicular to the line passing through the paper presser 97 and the center of the paper feed roller 3. There was a drawback to taking too much. Further, a release lever 9 is provided to freely pull out the printing paper 16, but this takes up space and requires a large number of parts (resulting in an increase in manufacturing costs).

Furthermore, although the printing paper regulating member 17 is designed to have spring properties, if the spring length is not made thicker, the number of spring legs will be small and variations in shape will cause a large change in load, and the force that presses the printing paper 16 will be reduced. It becomes stronger or weaker than 0 (if it becomes strong, it will cause an abnormal load when feeding the printing paper 16, and if it becomes weak, it will not be able to hold down the printing paper 16 enough and it will come into contact with the type wheel 10, causing dirt) It was something to do.

Furthermore, when assembling the paper feed shaft 2, a pair of frames IK
However, since a paper feed roller 3 with a large diameter is provided in the center of the paper feed shaft 2J, it is necessary to pass the paper feed shaft 2 through the round hole 107 in the frame 1. It was difficult to assemble. Also, it is conceivable to open fItv=- from the outside of the frame IK to the hole 107, drop the paper feed shaft 2 there, and support it with a bearing, but in this case too, the number of parts is large. In addition, the frame 10" was weakened due to the long groove.Also, even though such a mechanism placed a load on the printing paper 16, the paper feed shaft 2 When rotated by the driving force of a motor or the like, intermediate transmission mechanisms, such as gears, often suffer damage such as flashing, reducing reliability.

In addition, the pressure of the printing roller 14 on the type wheel 10 causes the paper to become stiff, fluff, etc., where printing is continued for a long time. If there is an important component (for example, an electromagnet) in the part, the influence of paper dust, fluff, etc. can cause malfunction and reduce reliability. , the structure is simple and compact, and the assembly and IL/
-h To provide an inexpensive paper feeding mechanism □. Another object of the present invention is to provide a highly reliable paper feeding mechanism that does not cause damage to the machine even if a paper jam or the like occurs. Still another object of the present invention is to provide a highly reliable compact printer in which important mechanisms are not affected by paper dust, fluff, etc.

A specific example of the paper feeding mechanism of the small printer of the present invention will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a side sectional view, and FIG. 3 is a perspective view.

A 21N #'i paper feed shaft is rotatably supported in a groove 201 in the frame I. n is a paper feed roller, which is made of rubber and is pushed into the approximate center of the paper feed shaft 4.Although the cross-sectional shape of the paper feed shaft 21 is irregular, it has a hole shape that is almost the same as that of the paper feed shaft 21. In order to load the paper, the paper feed roller n also rotates in exactly the same way as the paper feed shaft B rotates. 2
Reference numeral 3 denotes a paper guide, and paper guides #231 and 232 for various companies fit into bins 202 and 203 provided in the frame I, respectively, and the paper guides are attached to KFII so that they can slide in the direction of arrow d. 24 is the paper guide B, and the - parts 241 and 242 bent on both sides are L/-h for the paper in the paper guide area.
Then, bend and fix the parts 241 and 242 so as to sandwich the paper guide ram 3. Therefore, the paper guide 1 is integrated with the paper guide device, and 112 on both sides of the paper guide B24.
43 is a guide for the printing paper 3.

A paper presser row is rotatably supported on the pipe section 233 which is attached to the paper guide member. The aSFi spring is a part of the paper guide A23, with one end attached to the frame 20 and the other end pulled in the direction of the arrow.

Therefore, this spring force acts as a force for the paper pressing roller to press the paper feeding roller n. 27 is fixed by welding the central part to the paper guide ram, and the horizontal spring member n and the vertical spring member 272 are used to push the printing paper 25 in the direction away from the type wheel train. This is a printing paper regulating member. 28 is a type wheel with type 281 printed on its surface. 29Fi is a rotating printing shaft installed in the motor, I is a printing roller holder that rotatably supports the printing roller 31, and the hole shape of printing shaft 4 is P! so that it rotates synchronously with p1 printing shaft 4. They have the same hole shape. 32 is an ink ribbon, which is inserted into the groove 204 cast on the frame 20 and connected to the type wheel train and the printing roller 31.
It is located between. Note that $204 is connected to $201, which supports the paper feed shaft 4, and is η. Oha paper feed #I
I[ and is fixed to the paper feed shaft 4. A is the paper feed drive gear, which intermittently feeds the paper feed gear O. The printing paper 3 passes between the paper guide B24 and the paper guide B24, and is pressed by the paper presser roller 3 along with the paper feed a-ra, and then the ink ribbon is released. and the printing roller 31 and exits from the frame. In FIG. 3, the printing roller 31 and the character wheel train are omitted.

With this elegant configuration, if the type 281 is selectively stopped at the printing position and the printing roller 31 presses the type 281 via the ink ribbon feather and the printing paper 6, characters can be printed on the printing paper 25. However, in the past, the paper feed drive gear, the paper feed gear, the paper feed shaft 4, and the paper feed roller n were set at a predetermined angle of 1.
As it rotates, the printing paper δ is fed by a fixed amount due to the frictional force with the paper feeding roller n.

In addition, in order to freely pull the printing paper 25 forward and backward, it is sufficient to press the paper 3 to separate the paper presser roller from the paper feed rollers, but this operation is performed by one of the paper guide members. Pushing part 233 in the direction of arrow f 1iFlk 0 Paper industry circle 2 moves in the direction of arrow f while being regulated by the bins 202 and 203 against the force of the spring, and with this movement the paper presser roller % also moves in the direction of arrow 1 In this state, if you pull the printing paper 3 back and forth, it will come out freely.

With these various structures, the paper presser roller 3 can be directly connected to the paper guide arm, and the paper guide arm can be pulled by a spring.
Since the pressing force of the paper presser roller is obtained, parts such as a paper presser lever are not required, and the number of parts is small (low cost).

Also, since the paper presser lever is used, it can be made smaller because it can fulfill its functions in a small space. In order to further free up printing paper? -1, if you directly press down on the paper guide field, 2<,
Since parts such as a release lever are not required, it is cheaper and more compact! I! can be expressed. Also, when assembling the paper feed shaft 4 with the paper feed 9th stitch 522 attached, drop the paper feed shaft 4 from the ink ribbon groove 204 and hold it by #I201t, which will become the bearing part. Since the assembly is complete, there is no need to go through the trouble of passing the shaft through the hole in the frame, making it very easy to assemble. Also, this #I204 is originally necessary as it is a groove for supporting the ink ribbon, and by using this assembly method, the strength of the frame does not decrease in g, which increases reliability. . Also printing paper 5
If the paper is fed when the machine is forcibly stopped near the busy entrance, a large load will be applied to the paper feed tooth l[33] and the paper feed drive gear 34, leading to damage. Since the bearing part of the paper feed shaft 21 is grooved, even if a load is applied, the paper feed shaft 21 resists the spring force and moves #1llK.
The distance between the centers of the paper feed gear and the paper feed drive gear increases, causing them to disengage and prevent damage. This effect can be obtained even between the engagement part between the paper feed shaft 4 and the paper feed roller n, that is, the irregularly shaped hole of the rubber paper feed roller ρ, and the paper feed shaft 2, which has a groove with an irregular cross-sectional shape. arise.

When the printing paper δ is fixed, even if the paper feed shaft 21 rotates,
This prevents damage to the paper feed tooth I [33 and the paper feed drive tooth monotonous] in cases where the irregularly shaped hole of the rubber paper feed roller is deformed and the irregularly shaped #I211 is shifted one by one. . Since the spring structure 271 in the horizontal direction of the printing paper regulating member 27#i is made of a general type, this part is both twisted and bent, and serves to reduce the spring constant. Therefore, the force holding down the printing paper δ is stable, and there is no paper jam or dirt.Furthermore, since the horizontal space is used to hold the paper, it can be made smaller.

Also, since the printing paper regulating member I has a bent portion 273 that protrudes below between the type ring Z and the print roller 31 like a receiving plate,! Because this part receives the falling paper dust, fluff, etc. that occurs in the printing area, problems such as paper dust, fluff, etc. causing malfunctions can occur in important mechanisms such as electromagnets located below. It is something to be enjoyed.

According to Takaaki Moto, it is possible to reduce the size and cost of the structure by omitting parts such as levers, and also to avoid damage to the transmission mechanism even when subjected to abnormal loads of printing paper. A highly reliable paper feeding mechanism for a small printer can be provided. Furthermore, it is possible to create a compact printer that does not suffer from problems caused by paper dust, lint, etc., which has a significant negative effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional small printer.
1 is a frame, 2 is a paper feed shaft, 3 is a paper feed roller, 4 is a paper guide, 5 is a paper guide B, 6 is a paper presser lever, 7 is a paper presser row 5.8 is a spring, 9Fi release lever, 10 is a type wheel, 14 is a printing roller, 15 is an ink ribbon, lfl
The printed paper 17 is a printed paper regulating member. FIGS. 2 and 3 show a specific example of the compact printer of this bag, with FIG. 2 being a sectional view and FIG. 3 being a perspective view. K is the frame, 4 is the paper feed shaft, η is the paper feed roller, TA is the paper guide, U is the paper guide B, 25 is the printing paper, 26 is the paper presser,
27 is a printing paper regulating member 828 is a type wheel, 29 is a printing shaft,
3) is a printing roller holder, 31 is a printing roller, 32 is an ink ribbon 133 is a paper feeding tooth, and Shinshu Seiki Co., Ltd. is a manufacturer of 4-1゜

Claims (1)

[Claims] A paper guide member that guides the printed paper to a predetermined position, a paper feed roller preferably made of a torn rubber roller, and a paper feed roller that passes through the printed paper wound around the paper feed roller. The paper presser roller, which is rotatably attached to the paper guide member and is in contact with the paper guide member, includes nine paper presser rollers and a spring that biases the paper guide member in a certain direction, and the spring presses the paper presser a through the front paper guide member. - A paper feeding mechanism for a small printer, characterized in that the roller is suppressed by the paper feeding roller.