JPS61219671A - Printer - Google Patents

Abstract

PURPOSE:To provide a printer enabling easy setting of a recording paper with a simple mechanism, by providing a paper guide auxiliary plate for pressing a recording paper against a platen, the plate provided with projected parts to be engaged with a plurality of holes provided in a paper guide structure and projected parts to be brought into contact with a guide shaft. CONSTITUTION:The paper guide auxiliary plate 34 made of a metal is provided on the printing head 11 side of a paper guide 22. The plate 34 has a length approximate to the overall length of the platen 2, and is provided with the projected parts 34a to be engaged with a plurality of holes 22a in the paper guide 22 and the projected parts 35 to be engaged with the guide shaft 10. The projected parts 35 make contact with the shaft 10, the auxiliary plate 34 presses the recording paper 25 against the platen 2 with a fixed pressure, and is grounded through the shaft 10 to release electrostatic charges. The auxiliary plate 34 prevents the paper 25 from being caught by the head 11 when setting the paper 25, and prevents the paper 25 from being levitated from the platen 2, thereby reducing printing noise.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a printer that facilitates the loading of recording paper into the printer.

<Prior Art> Conventionally, when loading recording paper into a printer, there has been a problem in that the leading edge of the recording paper gets caught in the print head, making it difficult to load it. Attempts have been made to move the print head backwards when loading the recording paper to make it easier to attach the recording paper, but this has the disadvantage of making the mechanism complicated and expensive.

Purpose The present invention has been made to solve these problems, and its purpose is to provide a printer with a simple mechanism in which recording paper can be easily loaded.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

A paper guide 22 for winding the recording paper 25 around the platen 2 is integrally formed in the outer case 1 with resin, and a paper feed spring 29, a paper feed roller 27, and a paper feed roller shaft 28 are arranged in the upper part J: 9 sets. A groove 23 into which it can be inserted is open.

A plurality of protrusions 30 for inserting paper feed springs 29 are provided in the groove 26 shown in FIG. 4, and the paper feed springs 29 are inserted into the protrusions 30.

Next, a plurality of paper feed rollers 27 are inserted into the paper feed roller shaft 28 to form a converting unit, and the paper feed roller shaft 28 is connected to the paper feed spring 2.
9 is assembled into the groove 25. Ribs 33 protrude from both sides of the groove 23, leaving a gap in the center that is large enough for the paper feed roller shaft 2B to pass through. In FIG. 4, only the ribs provided on one side of the groove are shown, and the ribs on the other side are omitted. A plurality of ribs 65 are provided to sandwich the protrusion 50, and have a curved surface that is continuous with the curved surface of the paper guide 220.

The paper feed spring holder 26 has a cavity for holding the paper feed spring 29 therein, is provided with a U groove that engages with the paper feed roller shaft 2B, and has an upper outer peripheral surface formed into a curved surface that is continuous with the curved surface of the paper guide 220. It has become.

In the construction shown in Figure i4, install the paper feed spring holder 26 from above the paper feed roller shaft 28 that is in contact with the paper feed spring 29, and insert the protrusion at the tip of the paper feed spring holder into the mounting hole 31 provided on both sides of the protrusion 30. The parts are tied together.

The paper feed spring holder 26 prevents the paper feed spring 29 from collapsing, regulates the vertical movement of the paper feed roller shaft 28 smoothly, and controls the recording paper 25 passing surface in the groove 26 of the paper guide 22. This functions to eliminate dents, prevent the recording paper 25 from hitting the wall 32, and facilitate the setting of the recording paper 25 in the printer.

The paper feed roller 27 is biased upward by the paper feed spring 29 and presses the recording paper 25 against the platen 2. One end of the paper feed roller shaft 28 engages with the release lever 56 , and when the release lever is rotated, the paper feed roller shaft 28 moves downward against the spring force of the paper feed spring 29 , and the paper feed roller shaft 28 moves downward against the paper feed roller 27 . The structure is such that the platen 2 can be disengaged.

The ribs 33 provided on both sides of the groove 23 are provided to sandwich the paper feed spring holder 26 .
The paper feed roller shaft 28, together with the paper feed spring holder 26, is regulated to prevent it from falling down and to ensure smooth vertical movement of the paper feed roller shaft 28.

In this embodiment, there are two paper feed rollers 27,
Four paper feed spring holders 26 are provided.

Further, as shown in FIG. 1, the exterior case 1 has a support portion for the platen 2, the guide shaft 10, and the side frame 3. Both the platen 2 and the guide shaft 10 have a structure that allows them to be attached to the exterior case 1 from above, and by screwing them to the side frames 3a and 3bi exterior case 1 from above, the platen 2 and the guide shaft can be attached to the exterior case 1. It has a structure in which 10 fixations are made. At this time, the side frame 6a includes a paper feed motor 4 and a paper feed shimo motor 4.
An intermediate gear 5 is attached that meshes with the side frame 3a, and by attaching the side frame 3a, the intermediate gear 5 and the platen gear 6 mesh, and the power of the paper feed motor 4 is transmitted to the platen 2.

Further, a metal paper guide auxiliary plate 64 is provided on the side of the card 11 for printing on the paper guide 22. The paper guide auxiliary plate 34 has almost the entire length of the platen 2, and has a protrusion 34a that engages with the plurality of holes 22a of the paper guide 22, and a protrusion 55 that engages with the guide shaft 10. . The protrusion 35 is in contact with the guide shaft 10 so that the paper guide auxiliary plate 34 presses the recording paper 25 against the platen 2 with a constant pressure, and is grounded through the guide shaft 10 to dissipate static electricity.

In addition, the paper guide auxiliary plate 64 has a function of preventing the recording paper 25 from getting caught in the print head 11 when setting the recording paper 25, and also preventing the recording paper 25 from floating off the platen and reducing printing noise. have.

Further, a release lever 36 whose one end engages with the paper feed roller shaft 28 is rotatably attached to the side frame 6b. FIG. 5 shows the structure of the mounting portion of the release lever 56 and will be described. A claw 38 having spring properties is integrally formed on the side frame 6b and faces a shaft 37 which is the center of rotation of the release lever 66 via the V release lever 56. The relationship between the gap a between the protrusion 37 and the pawl 68 and the thickness of the release lever 66 is a (b), and when the release lever 36 is inserted along the protrusion 37, the pawl 3
With the springiness of 8, the relationship a≧b is established, and when the insertion is completed, the relationship is a(b).The structure is also machined to position the release lever 36 with respect to the side frame 3b and to prevent the release lever 36 from falling off.

Furthermore, paper press levers 39 and 40 are attached to the side frames 3a and 3b in the same manner as the release lever 36, respectively. A paper pusher roller shaft 42 having a paper pusher roller 41 is attached to one end of the paper pusher lever 39,40. FIG. 6 shows a sectional view of the paper pusher roller shaft 42 of the paper pusher roller 41 in an attached state. Paper press erola 41
One end has a plurality of notches 43 on the circumference and a protrusion 4 on the inner peripheral surface.
4 is a provision.

The relationship between the protrusion 44t'' connecting d, the diameter e of the paper pusher roller shaft 42, and the diameter f of the groove 45 provided in the paper pusher roller shaft 42 is e) a) f. When inserting the shaft 42, the relationship e==eL is established due to the incision 43, and the protrusion 44 and #445
When the positions of are aligned, the relationship becomes e) d) f.

In this way, the paper pusher roller 41 is positioned with respect to the paper pusher roller shaft 42, and has a structure that allows rotation of the paper pusher roller shaft 42 with a small force. 59.40 and the paper pushing roller shaft 42 are fixed in the same manner. Here, by making the engagement part between the paper pusher lever 59, 40 and the paper pusher roller shaft 42 longer, the structure is such that when either one of the paper pushers (-59, 40) is moved, the other moves in conjunction. .

The exterior case 1 is an integrally molded product made of resin.

A base plate 16 made of gold is attached to the bottom for reinforcement. The attachment part between the exterior case 71 and the base plate 13 is shaped like the one shown in FIG. 5 to absorb the difference in thermal expansion between the resin and the remaining end. By having the same design as the JILT plate, the base plate 13 has a structure that can absorb the difference in thermal expansion without causing play in the installation.

A driving pulley 8 and a driven pulley 9 on which a timing belt 24 having a coefficient of thermal expansion similar to that of the base plate 16 is hung are supported on the base plate 13, and an OR motor 7 for carriage scanning that engages with the driving pulley 8 is also attached. . Note that holes are provided in the exterior case 1 at positions corresponding to the driven pulley shaft 14, the drive pulley shaft 15, and the motor struts 16 and 17. Therefore, no matter how much the exterior case 1 expands or contracts due to heat, the tension of the timing belt 24 can be maintained constant, and the structure ensures smooth movement of the carriage 12 within the operating temperature range. ing. Furthermore, the base grating 13 serves as an electromagnetic shield that will not adversely affect the screen when the printer is placed on Of'tTO.

Effects> As explained above, according to the present invention, a paper guide formed along the platen, a protrusion that engages with a plurality of holes provided in the structure, and a protrusion that abuts the guide shaft of the carriage are provided. Since it has a paper guide auxiliary plate that is placed on the printing side of the paper guide structure and presses the recording paper against the platen, it prevents the recording paper from getting caught in the print head and prevents the recording paper from floating off the platen. This has the effect of preventing printing noise and reducing printing noise. Furthermore, since the paper guide auxiliary plate is grounded through the guide shaft, accumulated static electricity can be dissipated, which also has the effect of preventing various troubles associated with the generation of static electricity.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a printer showing an embodiment of the present invention, Fig. 2 is a side sectional view thereof, Fig. 3 (a), (t))
4 is an exploded perspective view showing the assembled state of the paper feed roller unit. FIG. 5 is a sectional view showing the assembled state of the release lever. The figure is a sectional view showing a state in which the paper press roller is assembled into the paper press roller shaft. 1...Exterior case 2...-Platen sa, s
b...Side frame 4...Paper feed motor 5...Intermediate gear 6...
Platen 7... OR motor 8... Drive pulley 9... Driven pulley, 10... Guide shaft 11... Print head 12... Carriage
13... Pace plate 14... Driven pulley shaft 15... Drive pulley shaft 16.17... Motor support column 18.19... Guide shaft support part 20.21... Platen support part 22...・Paper guide section 25...Groove 24...Timing belt 25...Recording paper 26...Paper feed spring guide 27...Paper feed roller 28...Paper feed roller shaft 29...Paper feed spring 34...Paper guide auxiliary board 6
6... Release lever 41... Paper pushing roller 42.
・・Paper press roller shaft Ganto Kamiyama Epunun 9 Co., Ltd. Suwa Seikodai Co., Ltd.

Claims (1)

[Claims] A carriage on which a print head is mounted and slides on a guide shaft, means for scanning the carriage, a platen facing the print head with a recording paper in between, and a paper guide structure formed in a shape along the platen. has a protrusion that engages with a plurality of holes provided in the paper guide structure and a protrusion that comes into contact with the guide shaft, is disposed on the print head side of the paper guide structure, and is configured to press the recording paper against the platen. A printer characterized in that it consists of a paper guide auxiliary plate attached.