JPH04358654A - Printing device - Google Patents

Abstract

PURPOSE:To perform proper printing by accurately setting a paper in a given position even when the thicknesses of the sheets are different from each other. CONSTITUTION:A paper stopper means 30 disposed downstream in a sheet conveying direction of first and second rotary rollers 4 and 24 and having a lock part 33 moving in a direction vertical to a sheet conveyance passage 2 of a rest body 1 and capable of opening and closing the paper conveyance passage 2 is provided. An interlocking means 40 causing a paper stopper means 30 to be operated such that the lock part 33 is moved in a direction, in which it closes the paper conveyance passage 2, when a moving frame 10 is rotated in an opening direction (in the direction of an arrow mark R) and such that the lock part 33 is moved in a direction, in which it opens the paper conveyance passage 2, when the moving frame is rotated in a closing direction (the direction of an arrow mark Q) is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device.

0002

[Prior Art] Conventionally, printing devices have been capable of automatically adjusting the gap between the platen and the print head according to the thickness of the paper, and were equipped with a paper stopper for positioning the beginning of the paper. It has been known.

The schematic structure of such a printing device is shown in FIGS. 4 and 5. In these figures, 1 is the main body of the device as a stationary body. The apparatus main body 1 is provided with a platen 3, first and second rotating rollers 4, 24, a movable frame 10, a carrier 20, a print head 21, a paper stopper 50, an interlocking lever 60, etc. (in FIG. 4, (The illustrations of the rotating rollers 4, 24, paper stopper 50, etc. are omitted).

Here, the platen 3 and the first rotating roller 4 are arranged along the paper conveyance path 2 of the apparatus main body 1, as shown in FIG. This first rotating roller 4 is rotated in the direction of the arrow via a drive motor (not shown) or the like.

Further, the movable frames 10, 10 are arranged to face each other in the longitudinal direction of the platen 3 (in the direction perpendicular to the plane of paper in FIG. 5), and each movable frame 10 is moved in the opening direction ( It is provided so as to be rotatable in the direction of arrow R) and the closing direction (direction of arrow Q). A carrier 20 is placed between the movable frames 10,
It is provided so as to be movable in the longitudinal direction of the platen 3 via a carrier shaft 22, a second carrier shaft 23), and the like. Note that the first carrier shaft 22 has both ends supported by the frames 10, 10, and the second carrier shaft 23 is attached to the stationary body (apparatus main body 1) side.

[0006] The carrier 20 also includes a print head 21.
is mounted so as to face the platen 3. Further, on the movable frame 10 side, a second rotating roller 24 is rotatably supported so as to be able to come into contact with and separate from the first rotating roller 4 on the apparatus main body 1 side.

Furthermore, the paper stopper 50 is a means for positioning the paper, and as shown in FIG.
It is rotatably supported via a fixed shaft 52 on the device main body 1) side. A locking portion 51 is formed at the tip of this paper stopper 50 . Further, the paper stopper 50 is biased clockwise by a spring or the like (not shown), and is positioned at the standby position shown in FIG. 5 when the movable frame 10 is closed.

Furthermore, the interlocking lever 60 is a means for operating the paper stopper 50 in conjunction with the rotation of the movable frame 10, and causing the locking portion 51 of the stopper 50 to open and close the paper transport path 2. Specifically, as shown in FIG.
1, and its left end in the figure is rotatably connected to the movable frame 10 via a shaft 62. Furthermore, an engaging portion 63 is formed at the right end portion of the interlocking lever 60 in the drawing.

[0009] In the above-described printing device, in order to set the paper P at a predetermined position on the paper transport path 2, the movable frame 10 is first rotated in the opening direction (arrow R direction) about the support shaft 11. Then, the platen 3 and print head 21
widen the gap between Then, the interlocking lever 60 rotates clockwise around the fixed shaft 61 in conjunction with the movable frame 10, and the paper stopper 50 is pushed by the engaging portion 63 of the interlocking lever 60 and rotates around the fixed shaft 52. The locking portion 51 of the paper stopper 50 rotates counterclockwise as shown in FIG.
The paper conveyance path 2 is closed by this. Next, in this state, hold the paper P so that its leading end is connected to the locking part 51 of the paper stopper 50.
Insert it between the platen 3 and the print head 21 and between the first rotating roller 4 and the second rotating roller 24 until it hits.

[0010] After the paper P has been positioned using the paper stopper 50 in this way, when the movable frame 10 is rotated in the closing direction (in the direction of arrow Q) and the second rotating roller 24 is brought into pressure contact with the paper P, Paper stopper 50 is movable frame 1
The locking portion 51 rotates clockwise according to the rotation amount of 0, and the locking portion 51 is retracted to a standby position above the paper conveyance path 2. Further, the print head 21 is automatically positioned by the first and second rotating rollers 4, 24, etc. at a position where the gap between the head 21 and the platen 3 is an optimum value depending on the paper thickness of the paper P.

[0011]

By the way, in the above-mentioned printing device, after the paper P is located using the paper stopper 50, when the movable frame 10 is rotated in the opening direction (R direction), the paper stopper 50 is rotated. 50 also rotates in conjunction, and the locking portion 51 is retracted from the paper conveyance path 2. At this time, the locking portion 51 moves in an arc around the fixed shaft 52 as shown in FIG. Move the paper P in the paper transport direction (arrow
direction) and push it back in the opposite direction. Here, the amount of pushing back the paper varies depending on the rotation amount of the movable frame 10 (therefore, the paper thickness of the paper P), etc., so paper P of different paper thickness etc. will be set at a different position, so it will not be accurate. This means that the paper P cannot be set in the specified position.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a printing device that can accurately set paper at a predetermined position and perform proper printing even if the paper has a different thickness.

[0013]

[Means for Solving the Problems] The present invention includes a platen and a first rotating roller disposed along a paper conveyance path of a stationary body, and a rotating roller that rotates the stationary body in an opening direction and a closing direction about a support shaft. a movable frame that is movable; a carrier that is movable on the movable frame via a guide member so as to be movable in the longitudinal direction of the platen; and a print head that is mounted on the carrier so as to face the platen. , a printing device comprising a second rotary roller provided on the movable frame so as to be able to approach and separate from the first rotary roller; a paper stopper means having a locking portion that can move in a direction perpendicular to a paper transport path of the body to open and close the paper transport path; and a paper stopper means that engages the paper stopper means when the movable frame is rotated in an opening direction. The locking portion is operated so as to be moved in a direction to close the paper conveyance path, and when the locking portion is rotated in the closing direction, the locking portion is operated so as to be moved in a direction to open the paper conveyance path. The present invention is characterized by being provided with interlocking means.

[0014]

[Operation] In the present invention, when the movable frame is rotated in the opening direction when setting the paper at a predetermined position on the paper transport path, the paper stopper means is activated by the interlocking means.
The locking portion closes the paper conveyance path. Next, in that state,
A sheet of paper is inserted between the platen and the print head and between the first and second rotating rollers until the leading end of the sheet hits the locking portion of the sheet stopper means.

[0015] After the paper has been positioned using the paper stopper means, when the movable frame is rotated in the closing direction to bring the second rotary roller into pressure contact with the paper, the locking portion of the paper stopper means is interlocked. The paper transport path is moved by the means in the direction of opening the paper transport path.

At this time, since the locking portion of the paper stopper means moves in a direction perpendicular to the paper transport path, the paper is not pushed back in the opposite direction to the insertion direction. Further, the print head is automatically positioned by the first and second rotating rollers, etc. at a position where the gap between the print head and the platen becomes an optimum value depending on the paper thickness of the paper.

[0017] Thereby, even if the paper thickness is different, the paper can be set accurately in a predetermined position and printing can be performed properly.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained based on the drawings. The printing device according to this embodiment can automatically adjust the gap between the platen and the print head according to the thickness of the paper, and uses a paper stopper to accurately hold the paper at a predetermined position. It is designed so that it can be set and printed properly. Specifically, as shown in FIGS. 1 to 3, this printing device includes a stationary body (device main body 1), a platen 3, first and second rotating rollers 4, 24, a movable frame 10, a carrier 20, and a print head. 21, a paper stopper means 30, and an interlocking means 40, which are characteristic parts of this apparatus. Components that are the same as those shown in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the paper stopper means 30 is a means for positioning the beginning of the paper. Specifically, the paper stopper means 30 is disposed downstream of the first and second rotating rollers 4 and 24 in the paper conveyance direction (X direction) and is mounted on a stationary body (
It is configured to include a locking portion (33) that can move in a direction perpendicular to the paper transport path 2 of the apparatus main body 1) to open and close the paper transport path 2.

In this embodiment, the paper stopper means 3
0 is composed of a paper stopper 31, a shaft 32, etc., as shown in FIGS. 2 and 3. Two paper stoppers 31 are provided between the movable frames 10, 10. More specifically, each paper stopper 31 is rotated on a vertical plane orthogonal to the paper transport path 2 via a shaft 32 on a fixed frame 35 provided in a portion of the apparatus main body between the movable frames 10 and 10. possible. Furthermore, a locking portion 33 is formed at one end of the paper stopper 31 so as to protrude in a direction perpendicular to the paper conveyance direction (X direction). Further, a locking portion 34 is formed at the other end of the paper stopper 31 so as to protrude in the paper conveyance direction (X direction).

Further, the interlocking means 40 is connected to the movable frame 10.
is rotated in the opening direction (direction of arrow R), the paper stopper means 30 is operated so that the locking portion (33) is moved in the direction of closing the paper transport path 2, and the paper stopper means 30 is rotated in the closing direction (arrow Q).
When the locking portion (33) is rotated in the direction (direction), the locking portion (33) is actuated so that it is moved in the direction of opening the paper conveyance path 2.

In this embodiment, the interlocking means 40 includes an engagement shaft 41 and a spring 42. The engagement shaft 41 is attached to the movable frames 10, 10 so that the frame 10 comes into contact with the engagement portion 34 of the paper stopper 31 when the frame 10 is closed. Further, the spring 42 is connected to the paper stopper 31 and is formed so as to press the engagement portion 34 of the stopper 31 against the engagement shaft 41 with its elastic force.

Next, the operation of this embodiment will be explained. When the movable frame 10 is rotated in the opening direction (R direction) when setting the paper P at a predetermined position on the paper transport path 2, the engagement shaft 41 of the interlocking means 40 is interlocked and moved upward. Then, the paper stopper 31 rotates following the engagement shaft 41 due to its own weight and the elastic force of the spring 42.
The locking portion 33 is positioned at the position indicated by the two-dot chain line in FIG. 2, and closes the paper conveyance path 2.

Next, in this state, the paper P is moved along the paper transport path 2 between the platen 3 and the print head 21 and between the first and second rotating rollers until the leading end of the paper hits the locking part 33 of the paper stopper 31. Insert between 4 and 24.

[0025] After the paper P has been positioned using the paper stopper 31 in this way, the movable frame 10 is rotated in the closing direction (Q direction), and the second rotating roller 24 is moved to the paper P.
When pressed, the locking portion 33 of the paper stopper 31 is moved by the interlocking means 40 in the direction of opening the paper transport path 2.

At this time, the locking portion 33 of the paper stopper 31 rotates (moves) in a direction perpendicular to the paper transport path 2, so the paper P is not pushed back in the direction opposite to the insertion direction (X direction). do not have. Further, the print head 21 is connected to the platen 3 by the first and second rotating rollers 4, 24, etc.
The position is automatically positioned such that the gap between the sheet P and the sheet P becomes an optimum value according to the thickness of the sheet P.

According to this embodiment, the paper transport direction (X direction) is
A paper stopper means 30 that is disposed downstream and has a locking portion (33) that can move in a direction perpendicular to the paper transport path 2 of a stationary body (apparatus main body 1) to open and close the paper transport path 2, and a movable frame. 10 is rotated in the opening direction (arrow R direction), the paper stopper means 30 is operated so that the locking portion (33) is moved in the direction to close the paper transport path 2, and the paper stopper means 30 is rotated in the closing direction (arrow R direction). Q direction), the relevant locking part (
33) is provided with an interlocking means 40 that operates so that the paper transport path 2 is moved in the direction of opening the paper conveyance path 2.
Even if the paper P has a different thickness, the paper P can be set accurately at a predetermined position and printing can be performed properly.

Note that in the above embodiment, the interlocking means 40
is constructed from the engaging shaft 41 and the spring 42, but the spring 42 may be omitted by directly connecting the engaging shaft 41 and the engaging portion 34 of the paper stopper 31.

Further, although the paper stopper means 30 is composed of two paper stoppers 31, etc., the number of paper stoppers 31 to be installed is not limited to this and can be arbitrarily selected.

[0030]

According to the present invention, there is provided a stationary member disposed downstream of the first and second rotary rollers in the paper transport direction and capable of opening and closing the paper transport path by moving in a direction perpendicular to the paper transport path. A paper stopper means having a stop portion, and when the movable frame is rotated in the opening direction, the paper stopper means is operated so that the locking portion is moved in the direction to close the paper conveyance path, and the paper stopper means is rotated in the closing direction. The structure is equipped with an interlocking means that moves the locking part in the direction of opening the paper conveyance path when the paper is moved, so even if the paper thickness is different, the paper can be handled accurately. It can be set in a predetermined position and printed properly.

[Brief explanation of drawings]

FIG. 1 is a diagram showing essential parts of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the opening/closing operation of a paper stopper means in one embodiment.

FIG. 3 is a diagram for explaining the positional relationship between paper stopper means and interlocking means.

FIG. 4 is a diagram showing the overall configuration of a conventional printing device.

FIG. 5 is a diagram for explaining a paper setting operation of a conventional printing device.

FIG. 6 is a diagram for explaining a problem that occurs in a conventional printing device.

[Explanation of symbols]

1 Apparatus main body (stationary body) 2 Paper transport path 3 Platen 4 First rotating roller 10 Movable frame 11 Support shaft 20 Carrier 21 Print head 22 First carrier shaft (guide member) 23
Second carrier shaft (guide member) 24 Second rotating roller 30 Paper stopper means 33 Locking part 40 Interlocking means

Claims (1)

[Claims] 1. A platen and a first rotating roller arranged along a paper conveyance path of a stationary body, and a movable frame provided on the stationary body so as to be rotatable in an opening direction and a closing direction about a support shaft. a carrier disposed on the movable frame so as to be movable in the longitudinal direction of the platen via a guide member; a print head mounted on the carrier so as to face the platen; In a printing device including a second rotating roller that is provided so as to be able to come into contact with and separate from a rotating roller, the second rotating roller is disposed downstream of the first and second rotating rollers in the paper conveying direction and is perpendicular to the paper conveying path of the stationary body. paper stopper means having a locking part that can move to open and close the paper transport path; and when the movable frame is rotated in the opening direction, the locking part locks the paper stopper means to open and close the paper transport path. An interlocking means is provided that is operated so that the locking section is moved in the closing direction, and when the locking section is rotated in the closing direction, the locking section is operated so that the locking section is moved in a direction that opens the paper conveyance path. A printing device featuring: