JP2545559Y2 - Media transport device of recording device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium conveying device for a recording apparatus in which a pinch roller and a driven roller, which are driven to rotate so as to convey a recording medium therebetween, are pressed against each other.

[0002] The pinch roller is generally formed of an elastic material such as rubber, and its surface has fine steps due to polishing. As a result, dust is clogged in the step during use, and the coefficient of friction of the surface is reduced, which impairs the transfer capability. Therefore,
It is necessary to clean the surface of the pinch roller from time to time.

[0003]

2. Description of the Related Art In a conventional medium transport apparatus of a recording apparatus, a cleaning set is prepared separately from the apparatus.
A user opens the lid of the apparatus and cleans the pinch roller using a cleaning set.

In some cases, the pressure of the pinch roller and the driven roller is set high in advance in anticipation of a decrease in the coefficient of friction.

[0005]

However, it is troublesome and troublesome for the user to perform cleaning using the cleaning set, and cleaning failure is likely to occur, resulting in transport failure.

Further, when the pressure is increased, there is a disadvantage that the paper is easily wrinkled when the thickness of the paper being transported is small. Therefore, an object of the present invention is to provide a medium transport device of a recording device that can easily and surely clean the surface of a pinch roller.

[0007]

In order to achieve the above-mentioned object, a medium transport device of a recording apparatus according to the present invention has a recording medium 100 interposed therebetween as shown in FIG. In a medium transport device of a recording apparatus in which a pinch roller 11 and a driven roller 12 that are driven to rotate are opposed to and pressed against each other, the driven roller 1
2 and a brush 28 is provided coaxially with the driven roller 12, and the pinch roller 11 is arranged so that the pinch roller 11 and the brush 28 face each other and come into contact with each other.
And roller shift means 32 and 37 for moving at least one of the driving rollers 12.

[0008]

When the pinch roller 11 and the brush 28 are brought into contact with each other by the roller shift means 32 and 37, and the pinch roller 11 is rotated there, the surface of the pinch roller 11 is cleaned by the brush 28.

[0009]

An embodiment will be described with reference to the drawings. FIG. 2 shows a printer in which a single-sheet printing paper 100 as a recording medium runs on a printing unit 3 between a platen 1 and a printing head 2.

The printing paper 100 is conveyed by being sandwiched between two pairs of pinch rollers 11 and driven rollers 12 which are opposed to each other before and after the printing section 3. Pinch roller 11
Is a drive shaft 13 driven to rotate by a paper feed motor.
Rubber roller fixed to the driven roller 12
Is a plastic roller fixed to a driven shaft 14 rotatably arranged. A compression coil spring 15 urges the driven shaft 14 so as to press the driven roller 12 against the pinch roller 11.

Reference numeral 17 denotes a cut sheet feeder for automatically feeding single-sheet printing paper 100. Reference numeral 18 denotes a manual paper feed unit for manually feeding a single-sheet printing paper 100. Reference numeral 19 denotes a discharge port from which the printed printing paper 100 is discharged.

FIG. 1 shows a paper feed mechanism. 21
Is a paper feed motor for driving the drive shaft 13 through gears 22 and 23. Reference numeral 24 denotes a pair of bearings that support the drive shaft 13.

Reference numeral 26 denotes a pair of bearings for supporting the driven shaft 14, and the compression coil spring 15 presses the bearing 26 to cause the driven roller 12 to pinch the pinch roller 11.
Pressed against.

A roller-shaped brush 28 (hereinafter referred to as "brush roller 28") is fixed to the driven shaft 14 adjacent to the driven roller 12. The outer diameter of the brush roller 28 is slightly smaller than that of the driven roller 12 so as not to come into contact with the surface of the printing paper 100 being conveyed.

A pulley 31 that is axially moved by a first operating lever 32 is rotatably mounted between a pair of flanges protruding from an end of the driven shaft 14. Therefore, when the first operation lever 32 is moved in the direction of arrow A, the pulley 31 is moved in the direction of arrow B,
At the same time, the driven shaft 14 and the driven roller 12 and the brush roller 28 fixed thereto move.

The end portion 14a of the driven shaft 14 is formed in a quadrangular pyramid shape.
4 are drilled. Therefore, the driven shaft 14 has the arrow B
When it moves in the direction, the quadrangular pyramid-shaped end portion 14a fits in the rectangular hole 34, and the rotation of the driven shaft 14 is prevented. When the first operation lever 32 is returned to the original position again, the driven shaft 14 also returns to the original state shown in FIG.

A rotary cam 36 is disposed on the outer surface of the pair of bearings 26 of the driven shaft 14 so as to face the compression coil spring 15 from the opposite side, and can be rotated by a second operation lever 37. .

The rotating cam 36 has three cam surfaces having different radial distances, and in the normal state shown in FIG. The surface is retracted from the outer surface of the bearing 26.

When the rotary cam 36 is rotated by the second operating lever 37, the radius of the cam surface is increased, the bearing 26 is lifted up against the urging force of the compression coil spring 15, and the driven roller 12 is moved. Pinch roller 11
Move away from the surface. Therefore, in this state, the first operation lever 3
2 to move the driven roller 12 in the axial direction (the direction of the arrow B).
Move to

The rotation cam 3 is moved by the second operation lever 37.
When the roller 6 is further rotated, the radius of the cam surface contacting the bearing 26 decreases, and the driven shaft 14 is pushed by the compression coil spring 15 to lower the tip of the brush of the brush roller 28 as shown in FIG. Comes into contact with the surface of the pinch roller 11.

At this time, the micro switch 38 is turned on, and the signal is input to the control unit 39 for controlling the operation of the paper feed motor 21, whereby the paper feed motor 21 is driven to rotate by a predetermined rotation in the reciprocating direction. It has become so. As described above, at this time, the rotation of the driven shaft 14 is prevented.

Therefore, the pinch roller 11 reciprocates while being in contact with the brush surface of the brush roller 28, the rotation of which is fixed, and the dust adhering to the surface of the pinch roller 11 is cleaned.

When the cleaning of the pinch roller 11 is completed, the first and second operation levers 32 and 37 are operated in the reverse order to return to the normal state shown in FIG. The present invention is not limited to the above embodiment, and the operation of the operation levers 32 and 37 may be automatically performed in conjunction with a motor or the like.

The present invention can be applied not only to printers but also to various apparatuses which need to convey a recording medium, such as copying machines and facsimile machines.

[0025]

According to the medium transport device of the recording apparatus of the present invention, the user can easily and reliably clean the surface of the pinch roller as needed without using a cleaning set or the like. It has an excellent effect that the ability can always be maintained in a good state.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment.

FIG. 2 is a schematic side view of the printer according to the embodiment.

FIG. 3 is a partial front view of an operation state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Pinch roller 12 Follower roller 28 Brush roller (brush) 32 1st operation lever (roller shift means) 37 2nd operation lever (roller shift means) 100 Printing paper (recording medium)

Claims (1)

(57) [Scope of request for utility model registration] 1. A medium for a recording apparatus in which a rotatably driven pinch roller (11) and a driven roller (12) are arranged in opposing pressure contact with each other in order to convey the recording medium (100) therebetween. In the transfer device, a brush (28) is provided coaxially with the driven roller (12) along with the driven roller (12), and the pinch roller (11) and the brush (28) are opposed to and contact with each other. For the above pinch roller (11)
And a roller shift means (32, 37) for moving at least one of the drive rollers (12).