JP2577163Y2 - Paper transport guide mechanism in recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper transport guide mechanism in a recording device such as an electrostatic plotter or a printer.

[Conventional technology]

Conventionally, a recording apparatus of this type includes a rotatable platen roller disposed on a substrate, a paper guide for guiding a sheet on the peripheral surface of the platen roller, and the platen in a roller arrangement hole formed in the sheet guide. A pinch roller rotatably and loosely arranged facing the roller, holding the sheet between the platen roller and the pinch roller, and feeding the sheet along the sheet guide by rotation of the platen roller, while recording The recording is performed on the paper on the platen by the head. The paper guide is fixed to the substrate via a bracket.

[Problems to be solved by the invention]

If there is a mounting error in the paper guide, there is a defect that the pinch roller strongly contacts the edge of the roller arrangement hole of the paper guide, the rotation of the pinch roller is prevented, and the paper cannot be transported smoothly. .

An object of the present invention is to eliminate the above-mentioned defects.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a rotatable platen roller 50 disposed on the substrate 2 and a platen roller 50 supported by a bracket 36 fixed to the substrate 2.
A paper guide 68 disposed in close proximity to the peripheral surface to guide the paper to the peripheral surface of the paper guide 68, and a roller arrangement hole 82 formed in the paper guide 68 allows the paper guide 68 to freely rotate facing the platen roller 50. In a recording apparatus having a pinch roller 74 fitted therein, the paper guide 68 is supported by the bracket 36 so as to be movable within a predetermined range.

[Action]

Even if the pinch roller 74 comes into contact with the edge of the roller arrangement hole 82 of the paper guide 68, the paper guide 68 can move within a predetermined range, so that there is a large contact friction between the pinch roller 74 and the edge of the roller arrangement hole 82. Without pinch roller 74
The rotation is not hindered by the edge of the roller arrangement hole 82.

〔Example〕

Hereinafter, the configuration of the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a substrate of a printing / printing / recording apparatus such as an electrostatic plotter, on which a pair of head slide shafts 4 and 6 are provided, and a recording head 8 is slidably mounted on the slide shafts 4 and 6. Brackets 10 and 1 erected on the substrate 2
2 includes a holder 16 for detachably holding the roll paper 14.
Is supported rotatably. 20 is the substrate 2
A shaft is rotatably supported by a bracket 22 erected at the other end, and one end of the shaft is connected to the support shaft 18 via a coupling 24. Reference numeral 26 denotes a shaft that is rotatably supported on the substrate 2 via a bearing (not shown). One end of the shaft 26 is connected to an output shaft of a drive motor 28 fixed to the substrate 2. ing. Pulley 30 fixed to the shaft 26
And an endless belt 34 is hung between the pulley 32 fixed to the shaft body 20 so that the rotation of the output shaft of the drive motor 28 is transmitted to the support shaft 18 of the holder 16. . A pair of brackets 36, 38 fixedly mounted on the substrate 2 support a pair of shaft support plates 40, 42, which are rotatable about axes parallel to the head slide shafts 4, 6, respectively. One side of each of the pair of shaft support plates 40, 42 is connected by a connection shaft 46. The pair of shaft support plates 40, 4
A lever 48 for lifting the platen roller is fixed to one of the two shaft support plates 40. Reference numeral 50 denotes a platen roller. Bearings 54 and 56 are fitted near both ends of a platen roller support shaft 52 projecting from the center of both side surfaces of the platen roller, and the bearings 54 and 56 are mounted on the brackets 36 and 38 by the shaft support. Board
It is detachably fitted in a fitting recess 58 protrudingly provided at a predetermined distance from the rotation center shafts 44 and 42. The platen roller support shaft 52 is rotatably fitted into a hole provided on the other side of each of the shaft support plates 40 and 42. At one end of the platen roller support shaft 52, a gear 60 is fixed.
The gear 60 meshes with a gear 62 fixed to the shaft 26. Tension coil springs 64, 66 are suspended between the other one of the shaft support plates 40, 42 and the substrate 2. Due to the tensile force of the coil springs 64, 66, the shaft support plates 40, 42
The platen roller 50 is urged about its rotation center axis 44 in the direction of pushing down the platen roller 50, and the outer peripheral surfaces of the bearings 54 and 56 are pressed against the fitting recess 58 by this urging force. A paper guide 68 is disposed below the platen roller 50, and one side of the paper guide 68 is fixed to the brackets 36, 38 by fixing screws 70, 72 in the horizontal and vertical directions in FIG. Mounted with play in range. To form the play, the shafts of the fixing screws 70 and 72 are loosely fitted into the mounting holes 84 of the paper guide 68,
The distance between the lower surfaces of the heads 70 and 72 and the upper surface of the bracket 36 is set wider than the thickness of the paper guide 68. The configuration in which play is provided in the support portion of the paper guide 68 is not particularly limited to the configuration shown in FIG. 1, and the paper guide 68 is attached to the bracket 36 by rubber, spring, or the like as shown in FIG. The connection may be made by a flexible member 86. A plurality of pivots 76 to which a pinch roller 74 is rotatably mounted are arranged on the same axis below the paper guide 68, and each pivot 76 is supported by the substrate 2. Each of the pinch rollers 74 is arranged in a roller arrangement hole 82 provided through the paper guide 68, and the pinch roller 74 faces the peripheral surface of the platen roller 50 via the roller arrangement hole 82. . The rotation center shafts 44 of the shaft support plates 40 and 42 and the shaft body 26 are arranged on a coaxial line. In the figure, 78 is a paper guide roller.

 Next, the operation of the present embodiment will be described.

The roll paper 14 held by the holder 16 is guided to the lower side of the platen roller 50, inserted between the peripheral surface of the platen roller 50 and the pinch roller 74, and held between the rollers 50 and 74. The drive of the drive motor 28 rotates the platen roller 50, and the platen roller 50 and the pinch roller
While the roll paper 14 is fed in the direction of the arrow due to the interaction with 74, predetermined printing and / or drawing is performed on the roll paper 14 on the platen 50 by the recording head 8. During the printing / drawing operation, the rotation of the output shaft of the drive motor 28 is transmitted to the holder 16 via the coupling 24, and the holder 16 moves in the feed direction of the roll paper 14 by substantially the same amount as the feed amount of the roll paper 14. Rotate. During the paper conveyance, even if the edge of the roller arrangement hole 82 of the paper guide 68 contacts the pinch roller 74, the paper guide 68
Is movable within a predetermined range due to the play of the support portion, that is, play, so that a large frictional force that hinders the rotation of the pinch roller 74 does not act on the pinch roller 74, and the pinch roller 74 smoothly contacts the platen roller 50 via the paper. It rotates due to friction.

〔effect〕

Since the present invention is configured as described above, the paper guide does not come into strong contact with the pinch roller, so that the paper can be prevented from meandering, and the mounting accuracy of the paper guide may be slightly roughened. There is an effect.

[Brief description of the drawings]

1 is a side view, FIG. 2 is an external view, FIG. 3 is an overall external view, and FIG. 4 is a side view showing another embodiment. 2 ... substrate, 4,6 ... head slide shaft, 8 ... recording head, 1
0,12… Bracket, 14… Roll paper, 16… Holder, 18…
Support shaft, 20 ... shaft body, 22 ... bracket, 24 ... coupling,
26… Shaft, 28… Drive motor, 30,32… Pulley, 34… Endless belt, 36,38… Bracket, 40,42… Shaft support plate, 44…
Shaft, 46 ... Connecting shaft, 48 ... Lever, 50 ... Platen roller, 52
… Support shaft, 54,56… Bearing, 58… Mating recess, 60,62… Gear, 64,66… Coil spring, 68… Paper guide, 70,72… Fixing screw, 74… Pinch roller, 76… Shaft support Body, 78: guide roller, 80: roller arrangement hole, 86: flexible member.

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotatable platen roller 50 disposed on a substrate 2 and a peripheral surface supported by a bracket 36 fixed to the substrate 2 for guiding a sheet to the peripheral surface of the platen roller 50. And a pinch roller 74 rotatably and loosely arranged in the roller arrangement hole 82 formed in the paper guide 68 so as to face the platen roller 50. In the apparatus, the paper guide 68 can be moved in any direction within a predetermined range.
Wherein the pinch roller 50 does not strongly contact the wall surface of the roller arrangement hole 82.