JPS6222373Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a recording paper feeding device for a printer.

2. Description of the Related Art Conventionally, there is a high-speed pen recording device as shown in FIG. 1, which is an example of a platen having a sprocket and a platen for feeding recording paper, and a printing head reciprocatingly moved along the platen. That is, a platen 5 connected to a motor 4 is installed on the side plates 2 and 3 of the frame 1. The platen 5 has a pair of sprockets 7 at both ends thereof for feeding the recording paper 6. Further, a guide plate 8 that guides the recording paper 6 is fixedly held in the frame 1 so as to face a part of the outer periphery of the platen 5. Further, a support shaft 9 is installed on the side plates 2 and 3 in parallel with the platen 5, and paper presser levers 10 are held at both ends of the support shaft 9, facing the sprocket 7 of the platen 5.

Next, the guide 1 installed on the side plates 2 and 3
A print head 13 is held at 1 and 12 so as to be movable in the left and right direction. The printing head 13 includes a ballpoint pen 14 which is biased towards the platen 5 and held so as to be able to move forward and backward, and a stopper which is actuated by the excitation action of a solenoid 15 to allow the ballpoint pen 14 to slide in the direction of the platen 5. 15a. Further, a motor 17 for driving a pulley 16 is provided on the left side of the frame 1, and a lever 19 for holding a pulley 18 is provided on the right side.
is biased to the right and supported so as to be freely deflectable in the left-right direction. Both ends of the wire 20 wound around these pulleys 16 and 18 are fixed to both sides of the print head 13.

Therefore, the motor 4 is driven in the forward and reverse directions to feed the recording paper 6 in the vertical direction (Z-Z), and the motor 17 is driven in the forward and reverse directions to move the print head 13 in the left-right direction (X-X). ), and by moving the ballpoint pen 14 forward and backward in the front-rear direction (Y-Y) by operating the solenoid 15, figures or characters are recorded on the recording paper 6.

However, if the guide plate 8 rubs the recorded surface, the recording paper 6 will get dirty, and the guide plate 8 and the platen 5 need to be opposed to each other with a predetermined distance. If the recording paper 6 is brought into close contact with the recording paper 6, the load will increase when driving the platen 5, making it impossible to perform minute paper feeding. Therefore, as shown in FIG. I need to open it.
That is, the recording paper 6 is lifted off the platen 5 and sprocket 7. Sprocket 7 pin and recording paper 6
There is some leeway in the dimensional relationship with the holes formed at equal pitches on both sides of the platen, and therefore the rotation angle of the platen 5 does not match the feeding amount of the recording paper 6, making it impossible to perform precise recording. It has its drawbacks.

This invention was developed in view of these points, and the purpose is to provide a recording paper feeding device for a printer that can accurately feed the recording paper and perform precise recording while also preventing the recording paper from becoming dirty. It is something to do.

This device has sprockets at both ends for feeding the recording paper, and a platen connected to a motor to rotate in both forward and reverse directions. A paper presser lever is provided so as to be able to approach and move away from the sprocket, and a plurality of rotatable pressers are positioned on the inside of the arc surface of the paper presser lever so as to be spaced apart from each other along the circumferential surface of the sprocket. It is characterized by being biased toward the paper so that it can move forward and backward. Therefore, a plurality of rotatable pressers are provided on the inside of the arc surface of the paper presser lever and are spaced apart from each other and biased toward the recording paper, so that the pins of the sprocket can be tightly inserted into the holes in the recording paper. Can be engaged with dust,
As a result, the recording paper can be wrapped around the circumferential surface of the sprocket, so that precise paper feeding can be performed even when the platen is rotated in the forward and reverse directions, so that detailed recording can be performed.

An embodiment of this invention will be explained based on FIGS. 3 to 6. Components that are the same as those described in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted. The paper presser lever 21 facing the sprocket 7 is connected to the support shaft 9.
is maintained. One leg 23 of a toggle spring 22 is supported by these paper presser levers 21. By attaching the other leg 24 to the side plate 2 or 3, these toggle springs 22 have the effect of urging the paper presser lever 21 in any direction from the dead point at the center of its rotation range. It shows. These paper presser levers 21 are formed with an arcuate surface 25 facing the outer peripheral surface of the sprocket 7 with a space therebetween, a groove 27 for letting the pin 26 of the sprocket 7 escape, and a recess 28 adjacent to the groove 27. There is. A plurality of leaf springs 29 are attached to these paper presser levers 21. These leaf springs 29 face the inside of the recess 28 from the surface of the arcuate surface 25 at a bending position, and a roller 30 serving as a presser is rotatably held at the tip end thereof. The outer diameters of these rollers 30 are set to be large at the center and gradually decrease toward both sides, and have a drum-like cross-sectional shape.

Next, as shown in FIG. 5, a case 31 that covers the entire frame 1 is provided with a paper separator 32 that separates the recording paper 6 sent out from the platen 5 from the supply side. This paper separator 32 has one end attached to the case 31 due to its own weight.
Legs 33 supported on the upper surface of the frame and extending from both sides of the center.
are rotatably held by being inserted into both inner sides of the case 31.

In this configuration, the paper presser lever 21 is separated from the sprocket 7 as shown by the imaginary line in FIG. 4 when the recording paper 6 is loaded. After the recording paper 6 is installed, the force of the toggle spring 22 causes it to fall toward the sprocket 7 until it comes into contact with a stopper (not shown), and only the roller 30 moves the recording paper 6 to the sprocket 7.
press against. As a result, the guide plate 8 is lifted off the recording paper 6 in order to prevent the recording paper 6 from getting dirty, and the paper presser lever 21 is moved in order to reduce the load.
It becomes possible to press the recording paper 6 against the sprocket 7 while satisfying the condition that there is a gap between the arc surface 25 of the platen 5 and the sprocket 7, and the platen 5 and the recording paper 6
It is possible to accurately determine the feed amount of the recording paper 6 and perform precise recording by eliminating the deviation. Further, since the roll 30 is shaped like a drum with a large diameter at the center and the contact surface with the recording paper 6 is small, the load on the platen 5 is further reduced and meandering of the recording paper 6 can be prevented.

In addition to the roller 30, a steel ball or a sled-shaped object having a small coefficient of friction may be used as the presser.

Note that the recording paper 6 fed out from the platen 5 is separated from the supply side by the paper separate 32 and can be taken out in an orderly manner. When setting the recording paper 6, as shown by the imaginary line in FIG. 6, the paper separate 32 is rotated rearward about one end of the leg 33 to widen the rear upper part of the case 31, and the recording paper can be set. 6 can be easily set.

As mentioned above, this device is equipped with a presser that presses the recording paper on the paper presser levers facing the sprockets at both ends of the platen, which presses the recording paper against the sprocket to prevent the two from slipping and feed the recording paper. It is possible to precisely determine the amount of paper and make precise recordings.Furthermore, the inner periphery of the paper presser lever is lifted off the sprocket to reduce the load on the platen, and the guide plate is lifted off the recording paper to remove dirt from the recording paper. It has the effect of being able to prevent such problems.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a side view showing the relationship between the sprocket of the platen and the paper presser lever, and Fig. 3 is a diagram showing an embodiment of this invention, in which the paper presser lever is attached to the inner surface. Perspective view from the side,
Fig. 4 is a vertical cross-sectional side view showing the relationship between the paper presser lever and the sprocket, Fig. 5 is a perspective view showing the overall configuration in a reduced size, and Fig. 6 is a reduced view showing the relationship between the platen and paper separator. FIG. 4... Motor, 5... Platen, 6... Recording paper, 7... Sprocket, 21... Paper presser lever, 25... Arc surface, 30... Roller (presser).

Claims (1)

[Scope of utility model registration request] A platen having sprockets for feeding the recording paper at both ends and connected to a motor to rotate in both forward and reverse directions is provided, and a pair of paper presser levers are formed with arcuate surfaces facing the outer peripheral surface of the sprocket and spaced apart from each other. A plurality of rotatable pressers are provided so as to be able to approach and move away from the sprocket, and are rotatable inside the arcuate surface of the paper presser lever, and are positioned spaced apart from each other along the circumferential surface of the sprocket, and are directed toward the recording paper. A recording paper feeding device for a printer characterized in that it is provided so as to be biased and move forward and backward.