JPH0537792U - Medium transport device for recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] A medium conveying device of a recording device in which a pinch roller and a driven roller that are driven to rotate to convey a recording medium sandwiched between them are arranged in pressure contact with each other. An object of the present invention is to provide a medium conveying device for a recording device, which can easily and surely clean the surface of the recording medium. A brush 28 is provided alongside the driven roller 12 coaxially with the driven roller 12, and at least one of the pinch roller 11 and the drive roller 12 is moved to bring the pinch roller 11 and the brush 28 into contact with each other. The roller shift means 32 and 37 are provided to configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a medium conveying device of a recording device in which a pinch roller and a driven roller that are rotationally driven to sandwich a recording medium between them and a driven roller are arranged so as to face each other and are pressed against each other.

A pinch roller is generally formed of an elastic body such as rubber, and a fine step exists on the surface thereof due to polishing. As a result, the step portion is clogged with dust during use, and the coefficient of friction of the surface becomes small, which impairs the carrying capacity. Therefore, it is necessary to clean the surface of the pinch roller from time to time.

[0003]

[Prior Art]

 In the conventional medium conveying device of the recording apparatus, a cleaning set is prepared separately from the apparatus, and the user opens the cover of the apparatus and uses the cleaning set to clean the pinch rollers.

[0004] Further, in some cases, the contact pressure between the pinch roller and the driven roller has been set to a high value in advance in anticipation of a decrease in the friction coefficient.

[0005]

[Problems to be solved by the device]

 However, it is troublesome and troublesome for a user to use a cleaning set for cleaning, and a cleaning failure is likely to occur, resulting in a conveyance failure.

Further, when the pressure contact pressure is increased, there is a drawback that wrinkles are likely to occur on a sheet when the sheet to be conveyed is thin. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a medium conveying device for a recording device that can easily and surely clean the surface of a pinch roller.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the medium conveying device of the recording apparatus of the present invention is driven to rotate in order to convey the recording medium 100 by sandwiching it, as shown in FIG. 1 for explaining the embodiment. In a medium conveying device of a recording device in which a pinch roller 11 and a driven roller 12 are arranged so as to face each other and are pressed against each other, a brush 28 is provided alongside the driven roller 12 coaxially with the driven roller 12. Roller shift means 32, 37 for moving at least one of the pinch roller 11 and the drive roller 12 in order to bring the pinch roller 11 and the brush 28 into contact with each other so as to face each other are provided.

[0008]

[Action]

 When the pinch roller 11 and the brush 28 are faced to each other and 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]

【Example】

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

The printing paper 100 is conveyed while being sandwiched between a pair of pinch rollers 11 and a driven roller 12 which are provided in front of and behind the printing unit 3 so as to face each other. The pinch roller 11 is a rubber roller fixed to a drive shaft 13 that is rotationally driven by a paper feed motor, and the driven roller 12 is a plastic roller fixed to a rotatably driven shaft 14. is there. Reference numeral 15 is a compression coil spring for urging the driven shaft 14 so as to press the driven roller 12 against the pinch roller 11.

Reference numeral 17 is a cut sheet feeder for automatically feeding the cut-sheet printing paper 100. Reference numeral 18 denotes a manual paper feeding section for manually feeding the cut-sheet printing paper 100. Reference numeral 19 denotes a paper ejection port through which the printed printing paper 100 is ejected.

FIG. 1 shows a paper feed mechanism. Reference numeral 21 is a paper feed motor that rotationally drives the drive shaft 13 via gears 22 and 23. A pair of bearings 24 supports the drive shaft 13.

Reference numeral 26 denotes a pair of bearings that support the driven shaft 14, and the compression coil spring 15 pushes the bearings 26 to press the driven roller 12 against the pinch roller 11.

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 that the brush roller 28 does not 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 that project from the end of the driven shaft 14. Therefore, when the first operation lever 32 is operated to move in the direction of arrow A, the pulley 31 is moved in the direction of arrow B, and at the same time, the driven shaft 14, the driven roller 12 and the brush roller 28 fixed to the driven shaft 14 move. To do.

The end portion 14 a of the driven shaft 14 is formed in a quadrangular pyramid shape, and the frame 10 facing the end portion 14 a has a quadrangular hole 34 formed therein. Therefore, when the driven shaft 14 moves in the direction of the arrow B, the quadrangular pyramid-shaped end portion 14a is fitted into the square hole 34, and the rotation of the driven shaft 14 is blocked. When the first operating lever 32 is returned to its original position, the driven shaft 14 also returns to the original state shown in FIG.

Reference numeral 36 is a rotary cam that is arranged on the outer surfaces 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 the second operating lever 37. .

The rotary cam 36 has three cam surfaces having different radial distances, and in the normal state shown in FIG. 1, in order to surely press the driven roller 12 of the pinch roller 11, The cam surface is retracted from the outer surface of the bearing 26.

When the rotating cam 36 is rotated by the second operating lever 37, the radius of the cam surface increases, the bearing 26 is lifted against the biasing force of the compression coil spring 15, and the driven roller 12 is lifted. Separate from the pinch roller 11 surface. Therefore, in this state, the first operating lever 32 is operated to move the driven roller 12 in the axial direction (arrow B direction).

When the rotary cam 36 is further rotated by the second operation lever 37, the radius of the cam surface that abuts the bearing 26 becomes smaller, and the driven shaft 14 is pushed down by the compression coil spring 15 and the driven shaft 14 is lowered. As shown in FIG. 5, the tip of the brush of the brush roller 28 comes into contact with the surface of the pinch roller 11.

Further, at this time, the micro switch 38 is turned on, and the signal is input to the control unit 39 that controls the operation of the paper feed motor 21, whereby the paper feed motor 21 is rotationally driven in a predetermined rotation in the reciprocating direction. It is supposed to be done. As described above, at this time, the rotation of the driven shaft 14 is blocked.

Therefore, the pinch roller 11 is reciprocally rotated while being in contact with the brush roller 28 whose rotation 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 of the above to return to the normal state shown in FIG. The present invention is not limited to the above-described embodiment, but the operations of the operation levers 32 and 37 may be automatically performed by interlocking with a motor or the like.

Further, the present invention can be applied not only to the printer but also to various devices such as a copying machine and a facsimile device which need to convey a recording medium.

[0025]

[Effect of the device]

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

[Brief description of drawings]

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

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

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

[Explanation of symbols]

 11 Pinch Roller 12 Driven Roller 28 Brush Roller (Brush) 32 First Operating Lever (Roller Shifting Means) 37 Second Operating Lever (Roller Shifting Means) 100 Printing Paper (Recording Medium)

Claims (1)

[Scope of utility model registration request] 1. A medium for a recording apparatus, in which a pinch roller (11) and a driven roller (12) which are driven to rotate are arranged to face each other and are in pressure contact with each other in order to convey the recording medium (100) between them. In the conveying device, a brush (28) is provided alongside the driven roller (12) coaxially with the driven roller (12), and the pinch roller (11) and the brush (28) are opposed to each other and brought into contact with each other. For the pinch roller (11)
And a roller shift means (32, 37) for moving at least one of the drive roller (12) and the medium transport apparatus of the recording apparatus.