JPS5842480A - Small-sized printer - Google Patents

Abstract

PURPOSE:To obtain an inexpensive, small-sized printer which can be easily assembled and has a simple structure in which one groove formed by connecting an ink ribbon passage groove with the supporting hole of a paper sending roller shaft in provided one frame. CONSTITUTION:In a printer, consisting of a frame 20 having a groove 204 through which an ink ribbon 32 passes, a paper sending roller shaft 21 pivotally supported in the hole of the frame 20 and having a rubber roller 22 on its periphery, a paper press roller 26 pressingly contacted through a printing paper 25 wound around the roller 22, paper guiders 23 and 24 to guide the printing paper 25 to a given position, and a spring part 35 serving to give a pressure to the paper press roller 26 directly and indirectly and attached to the frame 20 at its one end, one groove formed by connecting the groove 204 for the ink ribbon 32 with the groove 201 for the paper sending shaft 21 is provided on the frame 20.

Description

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

The paper feeding mechanism of a conventional small printer will be explained with reference to FIG.

1 is the frame, 2 is the paper feed shaft and the hole 1 made in the frame 1
It is rotatably supported on the shaft. Reference numeral 3 denotes a paper feed roller, which is made of rubber and fixed to approximately the center of the paper feed shaft 2 with adhesive. 4 is a paper guide and is installed in the groove 401.40
2 fit into pins 101 and 102 provided on the frame 1, respectively, and are fixed. Reference numeral 5 denotes a paper guide B, which is attached by fitting grooves 501 and 502 into the bins 1'm5 and 104 provided on the frame 1, respectively.

A printed paper regulating member 17 is partially welded to the paper guide A4 and has a spring property to keep the printed paper 16 away from the type wheel 1o to prevent stains due to scratches or the like. Reference numeral 6 denotes a paper presser lever, and a paper presser roller 7 is rotatably supported on the tip thereof, and the paper presser lever itself is rotatable around a fulcrum 601, and is constantly biased in the direction of arrow a by a spring 8. ing. 9 is a release lever, which is rotatably attached to a pin 105 provided on the frame;
is engaged with paper presser lever B. 10 is a type ring with type 11 provided on its surface. 12 is a printing shaft rotated by a motor, and 16 is a printing roller support that rotatably supports the printing roller 14, and rotates in synchronization with the printing shaft 12.

15 is an ink ribbon, and a groove 106 provided in the frame
I'm getting into it. In such a configuration, the printing paper 16
passes between the paper guide 4 and the paper guide B5, is pressed by the paper feed roller 3 and the paper presser roller 7, passes between the ink ribbon 13 and the printing roller 14, and comes out of the frame 1. . When the type 11 is selectively stopped at the printing position and the printing roller 14 presses the type 11 via the ink ribbon 16 and the printing paper 16, characters are printed on the printing paper 16. After this, the paper feed shaft 2 If you rotate the paper by a predetermined angle, printing paper 1
6 is fed by a constant amount due to the frictional force with the paper feeding roller 3.

In addition, in order to freely pull out the printing paper 16 back and forth, rotate the release lever 9 in the direction of the arrow, and rotate the paper presser lever 6 in the direction of the arrow C, thereby preventing the paper presser roller 7 from being gripped by the paper feed roller 6. Release the printing paper 16 to free it. At this time, if the printing paper 16 is pulled back and forth, it will come out freely.

In such a structure, it is efficient for the direction of the pressing force of the paper pressing roller 7 to face the center of the paper feeding roller 3.
In order to do this, it is desirable that the fulcrum 601 of the paper presser lever be perpendicular to the line passing through the centers of the paper presser roller 7 and the paper feed roller 3. However, this has the drawback that it takes up a lot of space. was there. Further, a release lever 9 is provided to freely pull out the printing paper 16, but this takes up space and increases the number of parts, resulting in an increase in cost. Also, although the printing paper regulating member 17 is designed to have spring properties, if the spring length is not made large, the spring constant will be small and variations in shape will cause a large change in load and the force that presses the printing paper 16 will become stronger. I felt weak. If it became too strong, it would result in an abnormal load when feeding the printing paper 16, and if it became weak, it would not be able to hold down the printing paper 16 enough and it would come into contact with the type ring 10, causing stains.

Furthermore, when assembling the paper feed shaft 2, it is supported by a pair of frames 1, but since the paper feed roller 3, which has a larger diameter than the paper feed shaft 2, is provided in the center, the paper Assembly was difficult because it was necessary to pass the feed shafts 2 through each. Also, in order to solve this difficulty in assembly, it is conceivable to make a long groove in the frame 1 that connects to the hole 107 from the outside, drop the paper feed shaft 2 into it, and support it with a bearing, but in this case too, the number of parts will increase. In addition, the strength of the frame 1 was weakened due to the long grooves. In addition, in such a mechanism, if the paper feed shaft 2 is rotated by the driving force of a motor or the like even though a load is applied to the printing paper 16, the intermediate transmission means, such as gears, may be damaged such as chipping. This often resulted in a loss of reliability.

Also, during long printing due to the pressure of the printing roller 14 on the printing wheel 10, paper dust, fluff, etc. occur, and especially in the lower part between the printing wheel 10 and the printing roller 14, paper dust and fluff occur. If there are parts (for example, electromagnets), paper dust, fluff, etc. can cause malfunctions and reduce reliability.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a paper feeding mechanism that is simple in structure, compact, easy to assemble, and inexpensive. 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 described with reference to FIGS. 2 and 3.

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

20 is a frame, and 21 is a paper feed shaft which is rotatably supported in a groove 201 provided in the frame 20.

Reference numeral 22 denotes a paper feed roller, which is made of rubber and is pushed into the approximate center of the paper feed shaft 21. Although the cross-sectional shape of the paper feed shaft 21 is irregular, it has a hole shape that is approximately the same as that of the paper feed shaft 21. Therefore, the paper feed roller 22 also rotates in exactly the same way as the paper feed shaft 21 rotates.

23 is a paper guide, and the grooves 231 and 232 are used for mounting.
Paper guides 23 are fitted into bins 202 and 203 provided on the frame 20, respectively, and are slidably attached in the direction of arrow d. Reference numeral 24 denotes a paper guide B, and the bent portions 241 and 242 on both sides fit into the grooves of the paper guide A23, and the portions 241 and 242 are bent and fixed so as to sandwich the paper guide A23. Therefore, the paper guide B24 is integrated with the paper guide A23, and the walls 243 on both sides of the paper guide B24 serve as guides for the printing paper 25.

Reference numeral 26 denotes a paper pressing roller rotatably supported by a receiving portion 233 provided on the paper guide A23. 35 is a spring; one end is attached to a part of the paper guide A23 and the other end is attached to the frame 2D;
The paper guide A23 is pulled in the direction of arrow e. Therefore, this spring force acts as a force for the paper pressing roller 26 to press the paper feeding roller 22. 27 is a printing paper whose central part is welded and fixed to a paper guide, and which is provided with a horizontal spring clasp 271 and a vertical spring clasp 272 to push the printing paper 25 away from the type ring 28. It is a regulating member.

28 is a type wheel with type 281 provided on its surface.

29 is a printing shaft rotated by a motor, and 3o is a printing roller support that rotatably supports the printing roller 31, and has a hole shape that is almost the same as that of the printing shaft 29 so that it rotates in synchronization with the printing shaft 29. There is. 32 is an ink ribbon that fits into the groove 204 provided in the frame 20 and prints on the type ring 2.
8 and the printing roller 31. Inner groove 204
is connected to the groove 201 in which the paper feed shaft 21 is supported. 33 is a paper feed gear fixed to the paper feed shaft 21. Reference numeral 34 denotes a paper feed drive gear which intermittently feeds the paper feed gear 33.

The printing paper 25 passes between the paper guide A 23 and the paper guide B 24, is pressed by the paper feed roller 22 and the paper pressing roller 26, passes between the ink ribbon 32 and the printing roller 61, and comes out of the frame 20. . In addition, in Fig. 3, the printing roller 31 part,
All 28 type wheels have been omitted.

In such a configuration, when the type 281 is selectively stopped at a printing position and the printing roller 31 presses the type 281 via the ink ribbon 32 and the printing paper 25, characters are printed on the printing paper 25. After this, the paper feed drive gear 34
9 The paper feed gear 33 connects the paper feed shaft 21 and the paper feed roller 2.
2 rotates by a predetermined angle, and the printing paper 25 is fed by a fixed amount due to the frictional force with the paper feed roller 22.

In addition, in order to freely pull out the printing paper 25 back and forth,
The paper press roller 26 pressing the paper feed roller 22
However, this operation is necessary to remove part 2 of paper guide A23.
33 in the direction of arrow f.

The paper guide A23 resists the force of the spring 35 and pushes against the pin 202.2.
The printing paper 25 moves in the direction of arrow f while being regulated by 03, and along with this movement, the paper pressing roller 26 also falls in the direction of arrow f, and if the printing paper 25 is pulled back and forth in this state, it will come out freely.

In this structure, the paper presser roller 26 is attached directly to the paper guide A, and the paper guide is pulled by the spring 35 to obtain the pressing force of the paper presser roller 26, so parts such as the paper presser lever are This eliminates the need for it, reduces the number of parts, and makes it cheaper. In addition, since there is no paper presser lever, it can be made more compact because it can fulfill its functions in a small space. 7 more pieces of printing paper
To do so, it is sufficient to directly push down the paper guide A25, and parts such as a release lever are not required, so it is possible to achieve low cost and miniaturization. Also, when assembling the paper feed shaft 21 to which the paper feed roller 22 is attached, the ink ribbon 32
Assembling is completed by dropping the paper feed shaft 21 through the slot 204 into which it is inserted and bringing it to the 1tlt 201 that will serve as the bearing, so 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. be. Also this groove 2
04 is essentially a groove in which the interribbon 32 is inserted, so it is absolutely necessary, and since this assembly method does not reduce the strength of the frame, reliability is also improved.

Also, when printing paper 25 is stopped near the entrance to Japan at strong point 1,
When feeding paper, the paper feeding gear 33 and the paper feeding drive gear 34
However, in this device, the bearing part of the paper feed shaft 21 is a groove, so even if a load is applied, the paper feed shaft will not move against the spring force of the spring 35. 21
However, the paper feed gear 33 and the paper feed driving gear 34 are separated from each other by escape along the groove, and the distance between the centers of the paper feed gear 33 and the paper feed drive gear 34 becomes large, thereby preventing damage. This kind of effect is caused by the paper feed shaft 2.
1 and the paper feed roller 22, that is, between the irregularly shaped hole of the rubber paper feed roller 22 and the paper feed shaft 21, which has a groove with an irregular cross-sectional shape. When the printing paper 25 is fixed,
Even if the paper feed shaft 21 rotates, the irregularly shaped hole portion of the rubber paper feed roller is deformed and the irregularly shaped grooves 211 are shifted one by one, and the paper feed gear 33 and the paper feed drive gear 34 are not damaged. It is something that can be prevented. Since the printing paper regulating member 27 is provided with a spring chamber portion 271 in the horizontal direction, both twisting and bending work in this portion, which serves to reduce the spring constant.

Therefore, the force for pressing the printing paper 25 is stabilized, and paper jams, stains, etc. do not occur. Furthermore, since the horizontal space is used, it is possible to downsize the device.

Further, the printing paper regulating member 27 has a type ring 28 and a printing roller 31.
The receiver has a bent part 273 that protrudes like a plate at the lower part between the receiver and the receiver, so this part catches the falling paper dust, fluff, etc. that often occurs in the printing area. Furthermore, troubles such as malfunctions caused by paper dust, fluff, etc. in important mechanisms such as electromagnets located below can be avoided.

As described above, according to the present invention, it is possible to make the structure smaller and lower in price by omitting parts such as levers, and it is also possible to achieve reliability without damaging the transmission @ lateral part even if there is an abnormal load on the printing paper. A paper feeding mechanism for a small printer with high performance can be provided. Furthermore, it is possible to create a small printer that is free from troubles caused by paper dust, fluff, etc., and its effects are outstanding.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a conventional small printer.
1 is a frame, 2 is a paper feed shaft, 6 is a paper feed roller, 4 is a paper guide, 5 is a paper guide B, 6 is a paper press lever, 7 is a paper press roller, 8 is a spring, 9 is a release lever, and 110 is a 14 is a printing roller, 15 is an ink ribbon, 16 is printing paper, and 17 is a printing paper regulating member. FIGS. 2 and 3 show a specific example of a small printer of the present invention, with FIG. 2 being a sectional view and FIG. 3 being a perspective view. 20 is a frame, 21 is a paper feed shaft, 22 is a paper feed roller, 26 is a paper guide, 24 is a paper guide B, 25 is a printing paper, 26 is a paper press roller, 27 is a printing paper regulating member, 28 is a type ring , 29
is the printing shaft, 30 is the printing roller holder, 31 is the printing roller, 3
2 is an ink ribbon, 33 is a paper feed gear, 34 is a paper feed drive gear, and 65 is a spring. Applicant Shinshu Seiki Co., Ltd. Suwa Seikosha Co., Ltd. Agent Patent Attorney Tsutomu Mogami

Claims (1)

[Claims] A frame having a groove for passage of the ink ribbon in a small printer that prints characters on the print paper by pressing and hitting a type holding member having type on the surface with a printing means such as a platen through an ink ribbon and printing paper; a paper feed roller shaft that is rotatably supported in a hole provided in the frame and has a roller preferably made of rubber attached to its outer periphery; a paper presser roller that is in pressure contact with the printing paper wrapped around the roller; and the printing paper a paper guide member that guides the paper to a predetermined position, and a spring member that directly or indirectly biases the paper pressing roller and has one end attached to the frame, connecting the groove provided in the frame and the hole. A small printer characterized by a single groove.