JP2554349Y2 - Recording paper guide structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide structure for guiding a recording paper mounting portion of a facsimile apparatus, a printer or the like to a platen roller. About.

[0002]

2. Description of the Related Art In this type of recording paper guide structure, a print head is pressed against a platen roller, and the recording paper is printed while being pressed by the print head between the platen roller and the print head. The paper is fed with the rotation of. The recording paper is guided from the roll paper to the print head by a guide member disposed and fixed along the axial direction of the peripheral surface of the platen roller. The platen roller can be pressed against and separated from the print head, and is normally pressed against the print head by a biasing force.By operating the operating lever when mounting from roll paper, the well-known cam mechanism reduces the biasing force. In contrast, the print head is separated from the platen roller.

[0003]

However, in the conventional recording paper guide structure described above, since the guide member is fixed to the platen roller, the guide member cannot be mounted on the platen roller from roll paper. The recording paper must be manually inserted into a very narrow gap between the recording paper and the platen roller, so that the recording paper cannot be easily mounted. In the case of a structure in which roll paper is stored at a position below the platen roller to reduce the size in the front-rear direction,
Since the leading end of the guide member is directed downward to guide the recording paper to the platen roller, the leading end of the guide member is covered by the platen roller, and the operator cannot visually check the leading end of the guide member, and attaches it. In this case, the user has to search for the entrance end, which is disadvantageous in that the installation is troublesome. The present invention has been made in view of the above-mentioned conventional inconveniences and drawbacks, and an object of the present invention is to provide a recording paper guide structure in which recording paper can be easily mounted.

[0004]

In order to achieve this object, a recording paper guide structure according to the present invention comprises a print head portion pressed against a platen roller by an urging force, and a circumferential direction of a peripheral surface of the platen roller. And a guide member that is swingably supported along the peripheral surface rotation direction of the platen roller around the rotation axis of the platen roller, and the guide member engages with the print head portion and A cam section for separating and pressing the print head section from the platen roller against the urging force, an operation section for selecting an engagement position between the cam section and the print head section, and The print head is separated from the platen roller by operating the operation unit, and the pointing direction of the guide unit is on the front side of the platen roller. Those that moved.

[0005]

In the present invention, when the operating portion of the guide member is operated, the print head is separated from the platen roller, and the direction of the guide portion of the guide member is moved forward of the platen roller.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a recording paper guide structure according to the present invention, FIG. 2 is a perspective view of an essential part of the same, FIG.
FIG. 4 is a side sectional view showing the mounting operation of the recording paper when the roll paper is replaced. In these figures, reference numeral 2 denotes a lower case forming a storage section 3 for storing the roll paper 35. The storage section 3 is disposed below the print head 15 to be described later in order to reduce the size of the apparatus in the depth direction. An opening 3 a is provided on the front side of the storage section 3. Further, a U-shaped bearing portion 2a is provided at the upper end of both side surfaces of the lower case 2, and a pair of dowels 2b projecting outward are provided at a lower portion. Reference numeral 5 denotes a platen shaft rotatably supported by the bearing portion 2a. Flanges 5a for restricting movement in the axial direction are provided at both ends. A platen roller 7 is integrally attached to the platen shaft 5. The platen roller 7 is rotated by a rotation drive from a motor (not shown) via a transmission gear 6 attached to one flange portion 5a.

Reference numeral 9 denotes a fixing bracket having a substantially U-shaped cross section.
A support hole 9a is formed in the bottom surface, and is fixed to the back surface of the lower case 2 by screws 10. The print head 15 is mounted on two brackets. That is, the head holding bracket 16 is provided at the center by the screw 17.
And attached to the head holding bracket 18 by screws 19 at both ends. A part of the lower end of the head holding bracket 16 is loosely fitted into the support hole 9a of the fixed bracket 9, and the head holding bracket 16 is supported swingably around the support hole 9a. The bracket 18 is provided with a U-shaped hole 18a, and the U-shaped hole 18a is slidably supported by the platen shaft 5, so that the print head 15 is eventually moved in the direction normal to the peripheral surface of the platen roller 7. It can swing freely. 2
Reference numeral 0 denotes a press spring for pressing the print head 15 against the platen roller 7.
Attached to.

A guide member 25 extends in the axial direction of the peripheral surface of the platen roller 7. The guide member 25 guides the recording paper 35 a to the platen roller 7.
5a and a side plate 26 whose both ends are bent at a right angle. A circular hole 26a is formed in the side plate 26,
The platen shaft 5 is inserted through the hole 26a, and the guide member 25 is supported rotatably about the platen shaft 5. Further, two cam surfaces 28 and 29 having different inclination angles are continuously provided on the upper edge of the side plate 26, and one of the cam surfaces 28 and 29 is in contact with the head holding bracket 16 of the print head 15. This determines the direction of orientation of the guide portion 25a of the guide member 25. In the normal printing state, the cam surface 28 is in contact, and the guide portion 25a is directed downward, that is, in the direction of the roll paper 35. And these cam surfaces 28, 29
Is in contact with the head holding bracket 16 across the contact position 20a of the pressing spring 20 with the head holding bracket 16, and the contact operation with the head holding bracket 16 is a click operation. Further, an operation plate 27 integrally formed is provided on the front side of the side plate 26.
The cam surfaces 28 and 29 abutting on the head holding bracket 16 of the print head 15 by rotating the hand 7 manually.
You can choose either.

Reference numeral 35 denotes a roll paper wound in the form of a recording paper roll.
5 and between the platen roller 7 and the print head 15 to be led out of the housing. A cover 40 pivotally supported by the dowel 2b of the lower case is attached to the opening 3a of the storage section 3 so as to be freely opened and closed. An engagement protrusion 41 is provided at an upper portion on the inner surface of the cover 40 at a position corresponding to the operation plate 27.

The operation will be described below. First, the normal state,
That is, as shown in FIG. 3, when the recording paper is in a printable state, the mounting portion 35 of the recording paper pulled out from the roll paper 35 is used.
A is guided between the platen roller 7 and the print head 15 by being guided by the guide portion 25a of the guide member 25 directed downward. Since the print head 15 is pressed against the platen roller 7, when a print signal is sent, a predetermined print is performed on the recording paper 35 a by the print head 15 and the paper is fed by the platen roller 7.

Next, when the roll paper 35 is replaced and the recording paper mounting portion 35a is mounted on the platen roller 7,
First, the cover 40 is opened in the direction A to open the opening 3a of the roll paper storage unit 3. Next, the operation plate 2 of the guide member 25
7 is rotated in the B direction. At this time, the print head 15
The cam surface in contact with the head holding bracket 16 of
Switching from 28 to 29, the operation plate 27 performs a click operation, and the posture is maintained in the state shown in FIG. In this state, the directional direction of the guide portion 25a of the guide member 25 moves to the front side of the platen roller 7, and the operator who inserts the recording paper visually recognizes the entrance end S ₁ of the guide portion 25a.
Can be confirmed, so that the recording paper can be easily inserted. At this time, at the same time, the guide portion 25a of the guide member 25
Since the gap S ₂ is generated between the rear end portion and the platen roller 7, the mounting portion 3 of the recording paper inserted from the inlet end S ₁
5a is smoothly fed along the peripheral surface of the platen roller 7 and sent to the print head 15 side. Since the print head 15 is the clearance S ₃ head holding bracket 16 is separated from the platen roller 7 against the pressure spring 20 by the cam surface 29 is formed, the mounting portion 35a of the recording paper sent printhead 15 And the platen roller 7 can be easily passed through and is led out of the apparatus.

A portion 35a for attaching recording paper to the print head 15
Is completed, when the operation plate 27 is rotated in the direction C, the cam surface of the print head 15 that contacts the head holding bracket 16 is switched from 29 to 28, and the guide member 25 returns to the state of FIG. The print head 15 is also pressed against the platen roller 7 to be in a printable state. Finally,
The cover 40 is closed in the direction D, and the opening 3a is closed. At this time, even if the operation of the operation plate 27 is forgotten and the operation plate 27 is in the state shown in FIG. 4, the projection 41 of the cover 40 is engaged with the operation plate 27 and pressed, so that the operation plate 27 is rotated in the C direction. You.

[0013]

As described above, in the recording paper guide structure according to the present invention, the guide member that extends in the axial direction of the peripheral surface of the platen roller and guides the recording paper is formed around the rotation axis of the platen roller. A cam portion which is swingably supported along the circumferential direction of the circumferential surface of the guide member and engages with the print head portion to separate and press the print head portion from the platen roller against an urging force. An operation section for selecting an engagement position between the cam section and the print head section; and a guide section for directing the recording paper to a platen roller in a downward direction, and the printing section is operated by operating the operation section. The head is separated from the platen roller and the direction of the guide is moved to the front side of the platen roller. It is possible to position the sheet entry end the operator side. This allows the operator to visually check the tip of the guide member, thereby facilitating the insertion of the recording paper. Further, since a gap is formed between the rear end portion of the guide portion and the platen roller, there is an effect that the inserted recording paper does not pass through and the recording paper can be smoothly mounted.

[Brief description of the drawings]

FIG. 1 is a front view of a recording paper guide structure according to the present invention.

FIG. 2 is a perspective view of an essential part of the recording paper guide structure according to the present invention.

FIG. 3 is a side sectional view of the recording paper guide structure according to the present invention;

FIG. 4 is a side sectional view showing a recording paper mounting operation in the recording paper guide structure according to the present invention;

[Explanation of symbols]

 7 Platen roller 15 Print head 20 Pressing spring 25 Guide member 25a Guide 27 Operation plate 28 Cam surface 29 Cam surface 35 Roll paper

Claims (1)

(57) [Scope of request for utility model registration] A print head portion pressed against the platen roller by an urging force; and a print head portion extending in an axial direction of the peripheral surface of the platen roller and swinging about a rotational axis of the platen roller along a rotational direction of the peripheral surface of the platen roller. A guide member movably supported, the guide member engaging with the print head unit, separating the print head unit from the platen roller against the urging force, and a cam unit for pressing the print head unit; An operation unit for selecting an engagement position between the cam unit and the print head unit;
A guide portion for directing the recording paper to the platen roller in a downward direction, and operating the operation portion to separate the print head from the platen roller and to direct the guide portion toward the front side of the platen roller. A recording paper guide structure characterized by being moved.