JPS6273969A - Printing apparatus - Google Patents

Abstract

PURPOSE:To reduce the movement distance of a bail shaft and applying larger pitch graduations to reduce noise while facilitating the setting of recording paper, by using a bail plate having a C-shaped cross-section in place of a bail shaft and mounting a roller to said bail plate through a holding member. CONSTITUTION:At the time of the setting of recording paper, bail levers 29a, 29b are revolved by a predetermined angle in the direction away from a platen 23 and held by the detent part 34 of a leaf spring 35. When recording paper 51 is wound around the platen 23 and the leading end thereof advances toward a bail plate 36, the recording paper 51 is contacted with the under surface 36a of the bail plate 36. The recording paper 51 contacted with the under surface 36a is bent in the direction of the platen 23 to be wound around the platen 23. Therefore, the angles of rotation of the bail levers 29a, 29b may be reduced and the opening part of the cover of a printer 21 can be made small. As a result, the sound blocking effect of the printer 21 can be enhanced and printing noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a printing device, and more particularly to a printing device that holds paper set on a platen and has an improved bail shaft provided with a pitch scale.

(Prior Art) Generally, in a printing device, when recording, first the recording paper is set on the platen. At this time, the bail shaft with the roller attached is separated from the platen, the recording paper is set, and the bail shaft is Move toward the platen and use rollers to bring the recording paper into close contact with the platen. Also, set the recording paper according to the pitch scale on the bail shaft.

For example, conventionally, as shown in FIG. 7, a printing device 1 has a frame 2 that rotatably supports a platen 3.
The frame 2 further supports a bail lever 4 so as to be rotatable in directions toward and away from the platen 3. The bail lever 4 holds a bar-shaped bail shaft 5, and a roller 6 is rotatably attached to the bail shaft 5. Further, as shown in FIG. 8, a groove 7 is formed in the bail shaft 5 in the longitudinal direction, and a pitch scale 8 having a pitch scale is loosely inserted into the groove 7. This pinch scale 8 is fixed to the bail shaft 5 with a screw (not shown).

Note that a space shaft 9 and a support stay 10 are arranged in the frame 2 in parallel to the platen 3, and the space shaft 9 and the support stay 10 slidably support a carrier 12 on which a printing mechanism 11 is mounted. .

Therefore, the recording paper 13 is placed on the platen 3 of this printing device 1.
To set the paper, rotate the bail shaft 5 together with the bail lever 4 toward the front side (in the direction away from the platen 3), insert the recording paper 13 into the rear side of the platen 3, and while rotating the frame 2, move the bail shaft 5 toward the front side (away from the platen 3). Wrap it around and send it toward you. When the leading edge of the recording paper 13 passes the bail shirt 85 position, adjust the position of the recording paper 13 according to the pitch scale of the pitch scale 8, and then rotate the bail lever 4 in the direction of the platen 3 to move the bail shaft 5. The recording paper 13 is brought into close contact with the platen 3 by the roller 6.

In this way, the cent is printed on the recording paper 13 by the printing mechanism 11.

However, in such conventional printing devices,
The bail shaft 5 is rod-shaped, and this bail shaft 5
Since the roller 6 was directly attached to the platen 3, when setting the recording paper 13 on the platen 3, the bail shaft 5 was kept far away from the platen 3, and the leading edge of the recording paper 13 was placed between the platen 3 and the bail shaft 5. need to be entered.

Therefore, it is necessary to form an opening necessary for the movement of the bail shaft 5 in the cover attached to the printing device, which has the problem of increasing noise during printing. Since the pitch scale was inserted into the groove formed in the shaft 5, the display of the pitch scale became small, making it difficult to confirm the pitch scale and requiring unnecessary time to set the recording paper. There was a point.

(Object of the Invention) Therefore, the present invention uses a bail plate having a dogleg-shaped cross section in place of the bail shaft, and attaches a roller to this bail plate via a holding member to reduce the amount of movement of the bail shaft. In addition, the purpose is to provide a large pitch scale to reduce noise and make it easier to center the recording paper.

(Structure of the Invention) In order to achieve the above object, the present invention includes a bail lever that is disposed at a predetermined distance in the axial direction of the platen and can swing in a direction toward and away from the platen, and a bail lever that is supported by the bail lever. A bail plate having a dogleg-shaped cross section, and a roller supported movably in the axial direction of the platen via a holding member on the bail plate and rotating as the platen rotates by contacting the platen, One surface of the bail plate faces substantially below the printing device, the other surface of the bail plate faces obliquely upward toward the front of the printing device, and a scale is provided on the other surface in the direction of the platen axis. be.

Hereinafter, the present invention will be specifically explained based on examples.

1 to 6 are diagrams showing one embodiment of the present invention.

In FIG. 1, 21 is a printer as a printing device, and the printer 21 uses its frame 22 to connect the platen to the
3 is rotatably supported. A space shaft 24 and a support stay 25 are arranged in the frame 22 in parallel with the platen 23, and the space shaft 2 and the support stay 25 slidably support a carriage 26. The carriage 26 carries a printing bag M27, and prints while moving along the platen 23.

The frame 22 supports a pair of levers 29a and 29b via a pin 28 so as to be rotatable in directions toward and away from the platen 23. That is, the bail lever 29a and the bail lever 29b are arranged at a predetermined distance apart in the axial direction of the platen 23. As shown in FIG. 2, mounting holes 30a and 30b are formed at one end of the bail lever 29a and the bail lever 29b, and the bail lever 29a
A hook portion 31 is formed at the other end of 9a. A spring 3 is provided between the hook portion 31 and the spring mounting member 32 for biasing the hail lever 29a toward the platen 23.
3 is attached to the frame 22, and the spring attachment member 32 is attached to the frame 22. Further, a temporary spring 35 having a detent portion 34 is in contact with the other end of the bail lever 293, and when the bail lever 293 is rotated in a direction away from the platen 23, the leaf spring 35 is activated by the detent portion 34 to release the bail lever. 293 at a predetermined angle.

The leaf spring 35 is attached to the frame 22.

The bail lever 29a and the bail lever 29b hold a bail plate 36 made of transparent resin (for example, polycarbonate, acrylonitrile styrene butadiene (ABS), styrene, etc.), and the bail plate 36 has a cross section that is As shown in FIGS. 4 and 6, it is formed in a dogleg shape.

The bail plate 36 has protrusions 37a, 37b formed on both ends thereof, and the bail plate 36 has protrusions 37a, 37b formed on both ends thereof.
By fitting the bail plates 36 into the mounting holes 30a, 30b, the bail plates 36 are attached to the bail levers 29a, 29b such that the bent portions are located on the front side of the printer 21.

Therefore, one surface (lower surface) 36a of the bail plate 36 faces below the printer 21, and the other surface (slanted surface) 36b
is facing diagonally upward on the front side of the printer 21.

A pitch scale 38 is provided on the other surface 36b in the axial direction of the platen 23, and a slit 39 extending in the longitudinal direction (in the axial direction of the platen 23) is formed in the bent portion of the bail plate 36.

The bail plate 36 holds the roller body 40 movably in the axial direction of the platen 23. That is, as shown in FIG. 5, the roller body 40 is composed of a holding member 41 and a roller 42, and the shaft 42a of the roller 42 is inserted into a guide hole 43 formed in the holding member 41. As a result, it is rotatably attached to the holding member 41.

The guide hole 43 is open to the outside through a guide hole 43a, and the outside of the guide hole 43a is formed into an outwardly tapered shape to facilitate insertion of the shaft 42a when installing the roller 42. There is. The holding member 41 has two arms 45, 46 separated by a groove 44;
The upper and lower surfaces of 6 form approximately the same angle as the bending angle of the bail plate 36, and each surface has a band-shaped projection 47, 48 with a semicircular cross section.
is formed. Further, the arm 45 is longer than the arm 46,
A protrusion 49 is formed at its tip. The upper surface of the protrusion 49 is formed into a tapered inclined surface, and a mark 50 in the vertical direction is attached to the inclined surface.

This roller body 40 includes a roller 42 as shown in FIG.
After inserting into the guide hole 43 and attaching it to the holding member 41,
Insert the arms 45 and 46 into the bent portion of the bail plate 36, and
It is attached to the bail plate 36 by protruding the protrusion 49 of No. 5 from the slit 39 and hooking it. therefore,
As shown in FIG. 6, the roller body 40 has an arm 45 and an arm 46.
The bail plate 36 and the arms 45.46 are attached to the bail plate 36 by the elastic force of the protrusion 49 and the protrusion 47.4.
8 makes a line contact, so the roller body 40 is inserted into the slit 39.
The platen 23 can be easily moved along the axial direction.

Next, the action will be explained.

When setting the recording paper, the bail levers 29a and 29b are rotated by a predetermined angle in the direction of the arrow X in FIG. When the recording paper 51 is wound around the platen 23 and its leading edge reaches the bail plate 36, the recording paper 51 comes into contact with the lower surface 36a of the bail plate 36, as shown in FIG. At this time, the lower surface 36a of the bail plate 36 is rotated in a direction to separate the bail plate 36 from the platen 23, so that the lower surface 36a of the bail plate 36 forms an inclined surface with the front side of the printer 21 lowered and the platen 23 side raised. Therefore, the recording paper 51 that has come into contact with the lower surface 36a is bent toward the platen 23 and wound around the platen 23, as shown in FIG. As a result, the rotation angle of the bail levers 29a, 29b may be small, and the opening of the cover of the printer 21 can be made small. This rotation angle corresponds to the distance 1. shown by Y in FIG. That is, the distance from the center of the roller 42 to the position of contact with the one surface 36a of the recording paper 51 may be smaller than the conventional one. Therefore, the sound insulation effect of the printer 21 can be enhanced, and printing noise can be reduced.

When the recording paper 51 is wound around the platen 23, the bail plate 36
The position of the recording paper 51 is adjusted while looking at the pitch scale 38. At this time, since the bail plate 36 is formed of a plate material, the pitch scale 38 can be made large. Therefore, the pitch scale 38 can be easily checked, and the position of the recording paper 51 can be easily adjusted.

When the position adjustment of the recording paper 51 is completed, the bail lever 29
a and 29b are rotated in the direction of the platen 23, and the recording paper 51 is brought into close contact with the platen 23 by the roller 42. At this time, depending on the size of the recording paper 51, the roller body 40 is moved to the platen 2.
By moving the recording paper 51 in three axial directions, the adhesion of the recording paper 51 to the platen 23 can be improved. In addition, the bail lever 29a
, 29b are urged against the platen 23 by the spring 33, so that the adhesion of the recording paper 51 to the platen 23 is further improved.

When the setting of the recording paper 51 is completed, printing is performed by the printing device 27. At this time, depending on the height of the operator, the printed portion may overlap the bail plate 36, but the bail plate 36 is made of transparent resin. Therefore, bail plate 36
You can easily check the printed part through the .

When the printing of the first line is completed, the platen 23 rotates to move the recording paper 51 in one direction. At this time, the roller 42 is rotatably supported by the holding member 41, so that
The roller 42 moves the recording paper 51, that is, the platen 2
It rotates with the rotation of 3. Therefore, the recording paper 51 is smoothly fed without being blocked by the roller 42 portion.

In the above embodiment, it has been described that one roller body 40 is attached to the hail plate 36, but it goes without saying that a plurality of roller bodies 40 may be attached.

(Effects) According to the present invention, a bail plate having a square cross section is used instead of a hail shaft, and a roller is attached to this hail plate via a holding member, thereby reducing the amount of movement of the bail shaft. , the pinch scale can be made larger, noise can be reduced, and recording paper can be easily set.

[Brief explanation of drawings]

1 to 6 are diagrams showing one embodiment of the printing device of the present invention. FIG. 1 is an overall perspective view of the printing device, FIG. 2 is an exploded perspective view of its bail plate portion, and FIG. 3 is a perspective view of the printing device. FIG. 4 is a partially enlarged perspective view of the bail plate, FIG. 5 is an exploded perspective view of the roller body, and FIG. 6 is an explanatory view of its operation. 7.8 is a diagram showing a conventional printing device, FIG. 7 is an overall perspective view thereof, and FIG. 8 is a sectional view of its bail shaft. 23...Platen, 29a, 29b...Bail lever, 36...
...Bail plate, 36a...Bottom surface, 36b...Slope surface, 38...Pitch scale, 39...Slit, 40... - Roller body, 41... Holding member, 42... Roller.

Claims (2)

[Claims] (1) A bail lever that is arranged at a predetermined distance in the axial direction of the platen and can swing in a direction toward and away from the platen;
A bail plate supported by a bail lever and having a dogleg-shaped cross section; and a roller supported by the bail plate via a holding member so as to be movable in the axial direction of the platen, and which contacts the platen and rotates as the platen rotates. , one side of the bail plate faces substantially below the printing device, the other side of the bail plate faces obliquely upward on the front side of the printing device, and the other side is provided with a scale in the direction of the platen axis. Characteristic printing device. (2) A printing device according to claim 1, characterized in that a slit extending in the platen axis direction is formed in the bent portion of the bail plate, and the holding member is movably fitted into the slit. .