JPS5922998Y2 - Media feed mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention involves inserting a medium such as paper between a drive roller provided on a drive shaft and a cylindrical driven roller provided opposite to the roller, and The present invention relates to a medium feeding mechanism in which the medium is conveyed by being brought into pressure contact with a drive roller.

Conventionally, the medium feeding mechanism of the above type has been installed near a printing position or the like in order to ensure stable feeding of the medium to a printing or reading position.

As a result, the media feeding mechanism is placed close to the printing mechanism, etc., and is installed in a relatively small space, resulting in a complex structure that reduces reliability and maintainability, and increases manufacturing costs. There were drawbacks to doing so.

On the other hand, in order to eliminate this drawback, a method has been adopted in which the media feeding mechanism is installed a little apart from the printing mechanism, etc., and a media guide is also used. Because static electricity is generated due to friction between
This has the disadvantage that the feeding of the medium becomes unstable.

The present invention uses a pair of truncated conical rollers for the drive roller to curve both ends of the medium, thereby increasing the rigidity of the medium and stabilizing the medium feeding, thereby eliminating the above-mentioned drawbacks. The purpose of this paper is to propose a mechanism.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing a medium feeding mechanism according to the present invention.
In the figure, the present invention inserts a medium 4 such as paper between a driving roller 2 provided on a driving shirt i-1 and a cylindrical driven roller 3 provided opposite to the roller 2, and In a medium feeding mechanism in which a driven roller 3 is brought into pressure contact with a driving roller 2 to feed the medium, the driving roller 2 is formed into a truncated conical shape, and this is made to correspond to both ends of the medium 4. Furthermore, the cylindrical driven roller 3 has a function of making line contact with the driving roller 2, and is provided at elbows t, 5 of the driving roller 2 and horizontally. It is something that can be taken.

The drive shaft 1 transmits the driving force of a motor 6 to the bell 1 via 5.

Note that 7 is a platen.

The driven roller 3 is rotatably attached to levers 9, 10 fixed to the driven shirts 1-8 via the roller shirts 1-11.

The levers 9 and 10 are made of spring material;
It is formed in an L-shape, and a plunger 12a with a two-sided nodular recess 2 and a return spring 13 are supported at the other end.

The cylindrical driven rollers 3, 3 come into contact with the drive rollers 2, 2 because the lever 9, and therefore the lever 10, also rotate clockwise due to the excitation of the solenoid 12, and in the case of demagnetization, the spring of the return spring 13 lever by force 9,
Therefore, the lever 10 also rotates counterclockwise, so that it separates from the drive rollers 2, 2.

Since the levers 9 and 10 are made of spring material, when the cylindrical driven rollers 3 and 3 come into contact with the drive rollers 2 and 2, the levers 9 and 10 are torsionally deformed and the cylindrical driven rollers The rollers 3, 3 are in line contact with the drive rollers 2, 2,
In other words, it comes into uniform contact with the rollers 2, 2,
Therefore, the medium 4 held between these rollers 2゜3
The ends of both sides are curved.

Note that the lever 9.8 to the driven shirt 1 fixed by the lever 10 is
It is rotatably supported on an arbitrary support.

To explain the operation of the proposed mechanism configured as described above, when the solenoid 12 is in a demagnetized state, that is, the cylindrical driven rollers 3, 3 are in a state separated from the drive rollers 2, 2, the rollers 2, Insert the medium 4 into the gap 3.

Next, when the solenoid 12 is energized, the plunger 12
a is sunk in, causing the lever 9 to rotate clockwise, and at the same time, the driven shaft 8 also rotates in the same direction, causing the lever 1 to rotate.
As a result, the cylindrical driven roller 3.3 contacts the drive rollers 2, 2 (point contact at this time) while pressing the medium 4, and the lever 9. The cylindrical driven rollers 3, 3 are distorted and become the driving rollers 2, 2.
As a result, both ends of the medium 4 are curved, and the rigidity of the medium 4 is increased.

Next, the motor 6 is activated, the drive roller 2.degree. 2 is rotated, and the medium 4 is sent out.

Note that the structure of the proposed mechanism is not limited to the above-described one, and other means may be used, such as using a truncated conical roller corresponding to the driving roller 2.2 for the cylindrical driven rollers 3, 3, or , the lever 9 is not limited to the L-shape; in short, the lever 9 can be either a cylindrical driven roller 3°3 or a truncated conical driving roller 2.
, 2 has the function of making contact with the line,
f-”L is fine.

As explained above, the present invention uses a pair of truncated conical rollers as the drive roller to curve both ends of the medium, so the rigidity of the medium is increased and the printing or reading position is increased. The media feeding mechanism can be separated from the media transport mechanism, thereby eliminating the flaws and rigors that conventional mechanisms had, thereby improving reliability and ease of maintenance. .

In addition, since the media feeding mechanism of the present invention can increase the rigidity of the medium, even when a media force is used, it can avoid the stable state of feeding the medium due to frictional static electricity. It is something that you have.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a medium feeding mechanism according to the present invention. 1... Drive shirt 1~. 2... Drive roller, 3... Cylindrical driven roller, 4...
- Medium, 5... Belt, 6... Motor, 7... Platen, 8... Driven shirt 1-19, 10... Rubber , 11... To roller shirt 1, 12... Solenoid, 13.
・・・・・・I bean return subring.

Claims (1)

[Scope of utility model registration request] A type of medium such as paper is inserted between a drive roller provided on a drive shirt l~ and a driven roller provided opposite to the roller, and the driven roller is brought into pressure contact with the drive roller to feed the medium. In the medium feeding mechanism, a driving roller formed in a truncated conical shape is fixed to a driving shaft in correspondence with both ends of the recording medium, and a driven roller is a cylindrical driven roller that can be twisted and deformed. A medium feeding mechanism, characterized in that it is supported by a slotted material and is provided facing the drive roller L so as to be able to make line contact with the drive roller.