JP2001080157A - Recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately set a recording position regardless of the direction of a heating element line. SOLUTION: A thermal head 82 is provided so as to be freely movable between a position spaced apart from a platen roller 81 and the pressure contact position with the platen roller 81 and a pair of positioning means 84 for releasing the mutual positioning of the thermal head 82 and the platen roller 81 at the spaced-apart position and mutually positioning the thermal head 82 and the platen roller 81 in a recording medium feed direction at the pressure contact position are provided on both sides of the platen roller 81 and the thermal head 82 and one positioning means 84 is constituted of the head positioning member 85 fixed to the thermal head 82 and coming into contact with the outer peripheral surface of a liner 89 at the pressure contact position and the platen positioning member 87 fixed to the platen support member 83 for supporting the platen roller 81 and having the liner 89 supported on the coaxial center of the platen roller 81 and the outer peripheral surface of the liner 89 is set as an eccentric cam surface 89a and the rotary position of the liner 89 is made variable to freely attach the platen positioning member 87 to the platen support member 83.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium interposed between a platen roller and a heat-sensitive head. The recording medium is conveyed by rotation of the platen roller, and an image is formed on the recording medium by the heat-sensitive head during the conveyance process. To a recording device.

[0002]

2. Description of the Related Art As a conventional recording apparatus of this kind, a plate making apparatus of a stencil printing apparatus is shown in FIG. 7, FIG. 7 (A) is a front view of a main part of the plate making apparatus, and FIG. FIG. 7A and 7B, a stencil sheet 8 as a recording medium is used.
Numeral 0 is a part of the transport path between the platen roller 81 and the thermal head 82. The platen roller 81 has a shaft 81a protruding from both sides rotatably supported by a platen support member 83, and the platen roller 81 is driven to rotate by the rotational force of a light pulse motor (not shown).

The thermal head 82 is supported by a head support member (not shown), and is pressed against the platen roller 81 via the stencil 80 by the rotational movement of the head support member, as shown in FIG. It is provided so as to be movable between a roller 81 and a separated position separated from the roller 81. Further, a pair of positioning means 84 is provided on both sides of the platen roller 81 and the thermal head 82 in the orthogonal direction.

Each positioning means 84 is composed of a head-side positioning member 85 fixed to the thermal head 82 and a liner 88 as a platen-side positioning member supported on a shaft 81a of a platen roller 81. The head-side positioning member 85 is provided with a notch 85a having a vertical end face 85b.
Is fixed assuming a predetermined positional relationship with respect to the head heating line (refers to a straight line connecting the heating elements arranged at a predetermined interval).

More specifically, as shown in FIG. 7, if a virtual line connecting the end faces 85b of the head-side positioning members 85 on both sides is defined as a head-side reference line, the head-side reference line is defined as, for example, the thermal head 82. With reference to the end face 82a,
The thermal head 82 is fixed so as to be parallel to the head heat generating line at an interval D.

Each liner 88 has a cylindrical shape with an outer radius D, and is supported on a coaxial center of a platen roller 81.
That is, on the outer peripheral surfaces 88a of the liners 88 on both sides, and
If an imaginary line connecting the positions where the end surfaces 85b of the head-side positioning members 85 contact each other is defined as a platen-side reference line (center axis of the platen roller 81), the platen-side reference line is spaced from the roller axis line of the platen roller 81 by a distance D. Are set parallel to each other.

In the above configuration, when the thermal head 82 is moved from the separated position to the pressure contact position side, the pair of liners 88 on the platen roller 81 side enter the notch portions 85a of the pair of head side positioning members 85, and the pair of liners 88 at the pressure contact position. The end surface 85b of the head-side positioning member 85 contacts the outer peripheral surfaces 88a of the pair of liners 88. As a result, the head-side reference line coincides with the platen-side reference line, and the head heat generation line of the thermal head 82 and the roller axis line of the platen roller 81 are parallel and coincident when viewed from above. Things.

[0008]

However, as shown in FIG. 8, the head heat generation line of the thermal head 82 is inclined with respect to the end face 82a of the thermal head 82 due to a manufacturing error or the like. In such a case, since the head side reference line and the head heat generation line are not parallel, even if the head side reference line and the platen side reference line are combined, the head heat generation line of the thermal head 82 and the roller The axis line is at least not parallel.

Since the recording medium conveyance direction of the stencil sheet 80 is determined based on the roller axis line of the platen roller 81, the stencil sheet 8 must be parallel to the heat generation line of the thermal head 82 and the roller axis line of the platen roller 81.
There is a problem that the plate making position of 0 is inclined and the printing position for the printed matter is also inclined. This is an important improvement problem for an apparatus that requires the printing position accuracy of a printed material.

Accordingly, the present invention has been made to solve the above-mentioned problem, and a recording apparatus capable of easily and accurately determining a recording position on a recording medium even if there is a variation in a direction of a heating element line of a thermal head. The purpose is to provide.

[0011]

According to a first aspect of the present invention, an image is formed on the recording medium by selective heating by a platen roller that conveys the recording medium by rotation and a plurality of heating elements arranged in a straight line. A heat-sensitive head, the platen roller and the heat-sensitive head being relatively movably provided between a separation position for separating the heat-sensitive head from each other and a pressure-contact position for pressing the stencil paper through the stencil sheet; On both sides in the direction perpendicular to the recording medium transport direction with the head,
In the recording apparatus provided with a pair of positioning means for canceling the mutual positioning at the separated position and mutually positioning with respect to the recording medium conveying direction at the pressure contact position, the thermal head is provided on at least one side of the pair of positioning means. And a position adjusting means for adjusting a position of the platen roller and the platen roller in the recording medium conveying direction.

In this recording apparatus, when the position adjusting means is provided on one of the pair of positioning means, if the positioning position in the recording medium conveying direction is changed by the one position adjusting means, the head heat generation line of the thermal head is changed. Is changed, and the head heat generation line can be aligned in parallel with the roller axis line.

In the case where the position adjusting means is provided on both of the pair of positioning means, the position adjusting means in the recording medium conveying direction is changed by the one position adjusting means as described above, or both are adjusted. The head heating line can be aligned in parallel with the roller axis line by changing the positioning position in both recording medium conveyance directions in the opposite direction by the position adjustment means, and both recording medium conveyance directions can be adjusted by both position adjustment means. By changing the positioning position by the same amount in the same direction, the head heating line can be translated in the recording medium conveyance direction.

According to a second aspect of the present invention, in the recording apparatus according to the first aspect, the positioning means is fixed to the heat-sensitive head, and a head-side positioning member which contacts the outer peripheral surface of the liner described below at the pressure contact position. A platen-side positioning member fixed to a platen support member that supports the platen roller, and having a liner supported on the same axis of the platen roller. The position adjusting unit biases the outer peripheral surface of the liner. Core cam surface, and
The rotation position of the liner may be changed so that the platen-side positioning member can be attached to the platen support member.

In this recording apparatus, when the position adjusting means is provided on one of the pair of positioning means, the rotational position of one of the liners is adjusted to change the positioning position in the recording medium conveyance direction. By changing the position of the eccentric cam surface of the liner with which the positioning member abuts, the inclination direction of the platen-side reference line and the head-side reference line can be changed, thereby changing the inclination direction of the head heat generation line of the thermal head. Can be adjusted parallel to the roller axis line.

In the case where the position adjusting means is provided on both of the pair of positioning means, the rotational position of one of the liners is adjusted as described above to change the position of the one recording medium in the conveying direction. Alternatively, by adjusting the rotational position of both liners and changing the positioning position in the recording medium conveyance direction in the opposite direction, the head heat generation line can be aligned parallel to the roller axis line, and both liners can be aligned. By adjusting the rotational position and changing the positioning position in both recording medium conveyance directions by the same amount in the same direction, the head heating line can be moved in parallel in the recording medium conveyance direction.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a stencil printing apparatus having a stencil making apparatus as a recording apparatus.

<First Embodiment> In FIG. 1, a stencil printing apparatus 1 includes a document reading unit (not shown), a stencil making unit 3, a printing unit 4, a paper feeding unit 5, a paper discharging unit 6, and a stencil discharging unit 7. It is mainly composed of

An original reading unit (not shown) reads an original as an electric signal. The read information can be processed based on a predetermined command (enlargement, reduction, etc.).

The stencil making unit 3, which is a stencil making device, includes a stencil container 1 for accommodating a long stencil sheet 10 wound in a roll shape.
A thermal head 82 disposed downstream of the stencil sheet 10 in the transport direction of the stencil sheet 10 with respect to the stencil accommodation section 11;
2 and a platen roller 81 which is rotated by a driving force of a write pulse motor (not shown).

The mounting of the thermal head 82 and the platen roller 81 and the positioning means for both will be described in detail below. The stencil making unit 3 is disposed downstream of the platen roller 81 and the thermal head 82 in the transport direction of the stencil sheet 10 and rotates with a driving force of a light pulse motor (not shown). A pair of base paper feed rollers 14, the platen roller 81 and the thermal head 82
And a stencil cutter (not shown) arranged between them.

The printing section 4 has a plate cylinder 16 and a paper cylinder 17 having substantially the same diameter, and the plate cylinder 16 has a pair of cylindrical flanges (not shown) provided to face each other at a predetermined interval. )
A stencil clamp 18 is provided on a part of the outer peripheral surface of the flange, and the tip of the stencil 10 can be clamped by the stencil clamp 18. A flexible screen 19 that forms the peripheral wall of the plate cylinder 16 is stretched over the outer peripheral surfaces of the pair of flanges of the plate cylinder 16 other than the base paper clamp unit 18. The screen 19 is configured to allow ink to pass through at least in the printing area when a printing pressure is applied.
An inner unit 20 is provided inside a screen 19 of the plate cylinder 16. The inner unit 20 has a roll support member 40, which is rotatably supported by a fixed member (not shown) about a support shaft 41. The roll 4 has a middle press roll 4
7 is rotatably supported, and the intermediate press roll 47 shifts between a pressing position (the state shown in FIG. 1) for pressing the screen 19 to the outer peripheral side and a standby position where it is retracted inside the screen 19.

The roll supporting member 40 is provided with a doctor roll 51 and a driving rod 52, respectively.
The doctor roll 51 is fixed to the roll support member 40 at a position close to the middle press roll 47. The drive rod 52 is rotatably supported by the roll support member 40, and ink (not shown) is supplied around the drive rod 52 from an ink supply unit (not shown). Then, the amount of the supplied ink is adjusted by the gap between the doctor roll 51 and the middle press roll 47, and is transferred to the inner peripheral surface of the screen 19 via the middle press roll 47.

A paper clamp 21 is provided at a predetermined position on the outer peripheral surface of the paper cylinder 17, and the paper clamp 21 can clamp the leading end of a printing paper 22 as a printed material.

The paper supply section 5 includes a paper supply table 23 on which print papers 22 as printed materials are stacked, a scraper 24 that presses the print paper 22 at the highest position from the paper supply table 23, and a downstream side of the scraper 24. The pickup roll 25 and the sabaki roll 2 which are arranged and are positioned substantially in proximity to each other.
6, this pickup roll 25 and sabaki roll 2
6 and a guide roll 27 and a timing roll 28 which are located substantially in proximity to each other.

The printing paper 22 moved by the rotation of the scraper 24 is allowed to be conveyed by the pickup roll 25 and the sabaki roll 26, and only the printing paper 22 at the uppermost position is allowed. The paper is conveyed in synchronization with the rotation of the paper cylinder 17 by the rotation of the timing roll 28 and the rotation of the timing roll 28.

The paper discharge unit 6 is a printing paper 22 on which printing has been completed.
Upper regulation guide portion 30 for guiding the leading end of
A paper stripping claw 32 for stripping the printing paper 22 that is not stripped from the paper, a paper transport mechanism 33 for transporting the printing paper 22 guided by the upper regulation guide portion 30 or peeled off by the paper stripping claw 32; And a stacker section 34 on which the printing paper 22 transported by the paper transport mechanism 33 is placed in a stacked state.

The plate discharging section 7 is a base paper clamp section 1 of the plate cylinder 16.
A stencil guide belt 35 for guiding the leading end of the stencil sheet 10 released from the stencil 8, a pair of stencil transfer belts 36 for transporting the stencil sheet 10 guided by the stencil guide belt 35 while peeling it off from the plate cylinder 16, Plate conveyor belt 3
And a stencil discharge box 37 for storing the stencil sheet 10 conveyed by the stencil 6.

Next, the construction and mounting of the thermal head 82 and the platen roller 81 and the positioning means for both will be described. 2 (A) is a plan view of a main part before position adjustment of the plate making unit, FIG. 2 (B) is a right side view thereof, FIG. 3 (A) is a plan view of a main part after position adjustment of the plate making unit, and FIG. It is a right side view.
2 (A) and 2 (B) and FIGS. 3 (A) and 3 (B)
The configuration and attachment of the thermal head 82 and the platen roller 81 are the same as those in the conventional example, and the corresponding portions in the drawings are denoted by the same reference numerals and description thereof is omitted.

The thermal head 82 and the platen roller 8
A pair of positioning means 84 is provided on both sides in the direction perpendicular to the recording medium conveyance direction as in the conventional example. Each positioning means 84 includes a head-side positioning member 85 and platen-side positioning members 86 and 87.
As in the conventional example, the head-side positioning member 85 is provided with a notch portion 85a having a vertical end surface 85b, and this end surface 85b is assumed to have a predetermined positional relationship with the head heat generation line of the thermal head 82. And fixed. Specifically, assuming that an imaginary line connecting the end surfaces 85b of the head-side positioning members 85 on both sides is a head-side reference line, this head-side reference line is, for example, a thermal head 82.
Is fixed so as to be parallel to the head heat generation line of the thermal head 82 at a predetermined interval based on the end face 82a of the thermal head 82.

One of the platen-side positioning members 86 is constituted by a liner 88 in substantially the same manner as in the prior art, and this liner 88 has a substantially cylindrical shape having a V-shaped groove 88b in a circumferential shape. Supported on the center. Then, the corresponding head-side positioning member 85 enters the V groove 88b of the liner 88 and is positioned. The other platen side positioning member 87 has a cylindrical liner 89 supported on the coaxial center of the platen roller 81, one end fixed to the liner 89, and the other end fixed to a platen support member 83 such as a frame.
And an arm portion 90 attached through the arm.

The liner 89 and the arm portion 90 are integrally formed, and the liner 89 is attached to the platen support member 83 by changing the mounting position of the platen-side positioning member 87. It is designed to rotate with respect to the shaft 81a.

The outer peripheral surface of the liner 89 is formed as an eccentric cam surface 89a whose distance from the center varies depending on the rotational position. The platen support member 83 is provided with an arc-shaped screw insertion hole 91. Can be mounted with the rotational position of the variable. That is, liner 8
9 is an eccentric cam surface 89a.
The position adjusting means 92 is configured by changing the rotational position and making it freely attachable.

Next, the operation of the stencil printing apparatus 1 will be briefly described. The stencil making section 3 conveys the stencil sheet 10 by rotation of the platen roller 81 and the stencil feed roller 14, and based on image information read by a document reading section (not shown), a number of stencils arranged on a straight line of the thermal head 82. The heat-generating element selectively heat-generates to perform heat-sensitive perforation on the stencil sheet 10, and cuts a predetermined portion of the stencil sheet 10 having a length corresponding to one plate length with a stencil cutter (not shown) to form a stencil sheet having a desired size. The base paper 10 is made.

In the printing section 4, the leading end of the stencil sheet 10 made by the stencil section 3 is clamped by the stencil clamping section 18 of the plate cylinder 16, and in this clamped state, the plate cylinder 16 is rotated to stencil the stencil sheet 10. Screen 1 forming the peripheral wall of body 16
9 Wrap and attach to the outer peripheral surface.

In the paper feeding section 5, the printing paper 22 is conveyed in synchronization with the rotation of the printing drum 16 and the printing drum 17, and the leading end of the printing paper 22 is clamped by the paper clamping section 21 of the printing drum 17. And between the paper cylinder 17.

On the other hand, the printing unit 4 rotates the plate cylinder 16 by positioning the middle pressing roll 47 at the pressing position during printing. Then, the middle press roll 47 rotates on the inner peripheral surface of the screen 19 while pressing the inner peripheral side of the screen 19. Since ink is constantly supplied to the outer peripheral surface of the intermediate press roll 47, the ink is transferred to the screen 19 by this rotation.

Further, the screen 19 is swelled to the outer peripheral side by the pressing of the intermediate pressing roll 47, and is brought into pressure contact with the paper cylinder 17. Then, as described above, the printing paper 22 is transported from the paper feeding unit 5 between the plate cylinder 16 and the paper cylinder 17, and the transported printing paper 22 is screened between the intermediate press roll 47 and the paper cylinder 17. It is transported while being pressed together with the stencil sheet 19 and the stencil sheet 10. In this pressing and conveying process, the ink is transferred from the perforated portion of the stencil sheet 10 to the printing paper 22 to print an image. When the rear end of the printing paper 22 passes through the position of the intermediate press roll 47 and reaches downstream thereof, the paper clamp unit 21 is released.

In the paper discharge section 6, the leading end side of the printing paper 22 is guided by the upper regulation guide section 30, or the leading end side of the printing paper 22 is peeled off from the paper cylinder 17 by a paper peeling claw 32. The sheet is conveyed to the stacker 34 via the conveying mechanism 33.

Further, in the plate discharging section 7, when starting a new plate making, it is necessary to discharge the used stencil sheet 10 used for the previous printing wound around the screen 19 of the plate cylinder 16 and mounted. In this case, however, the stencil clamp 18 of the plate cylinder 16 is released before the new stencil sheet having the stencil formed thereon on the outer peripheral surface of the peripheral wall of the plate cylinder 16, and the leading end side of the released stencil sheet 10 is released. Is guided by a plate discharge guide belt 35 while rotating the plate cylinder 16, and a pair of plate discharge conveyance belts 36.
And stored in the plate discharge box 37.

In the above stencil making operation, the stencil sheet 10
Is set in the direction perpendicular to the roller axis line of the platen roller 81. If the head heat generation line of the thermal head 82 is not positioned parallel to the roller axis line of the platen roller 81, the stencil sheet 10 The position will tilt. The positioning adjustment of the thermal head 82 with respect to the platen roller 81 for preventing the inclination of the plate making position will be described in detail.

That is, when the thermal head 82 is moved from the separated position to the pressure contact position side, the pair of head-side positioning members 8 are moved.
5, the liners 88 and 89 on both sides of the platen roller 81 enter the notch portion 85a, and the end surfaces 85b of the pair of head-side positioning members 85 are placed on the V groove 88b of one liner 88 and the other liner 89 at the pressure contact position. Eccentric cam surface 8
9a, the thermal head 82 and the platen roller 81 are positioned by this.

Here, as shown in FIGS. 2A and 2B, when the heat generation line of the heat-sensitive head 82 is inclined with respect to the roller axis line, the rotation position is changed and mounted. When the rotational position of the other free liner 89 is changed, the position of the eccentric cam surface 89a with which the end surface 85b of the head-side positioning member 85 contacts is changed. Then, the distance from the center of the liner 89 (the roller axis line) to the cutout portion 85b of the head-side positioning member 85 is changed, so that only the positioning position on the other side of the thermal head 82 is shifted in the recording medium transport direction, and Roller 8
The inclination direction of the thermal head 82 with respect to 1, that is, the inclination direction of the head heating line changes.

Since the amount of inclination can be varied according to the rotational position of the liner 89, as shown in FIGS. 3A and 3B, the head heat generation line coincides with the roller axis line when viewed from above. Can be done. FIG. 3 (A),
(B) shows the case where the head heat generation line and the roller axis line coincide when viewed from above.
In the embodiment, at least the head heat generation line can be aligned in parallel with the roller axis line.

Therefore, even if there is a variation in the direction of the heating element line of the thermal head 82, the stencil making position on the stencil sheet 10 can be accurately determined. And the position adjustment is liner 89
It is easy because it can be done only by changing the rotational position of the.

<Second Embodiment> FIGS. 4A and 5B and FIGS. 5A and 5B show a second embodiment of the present invention, and FIG. 4A shows the position adjustment of a plate making section. FIG. 5B is a plan view of the main part before the main part, FIG. 5B is a right side view thereof, FIG. 5A is a plan view of the main part after the position adjustment of the plate making part, and FIG. FIG. 4 (A),
5B and FIGS. 5A and 5B, a comparison between the second embodiment and the first embodiment shows that in the first embodiment, only one of the pair of positioning means 84 has the position adjusting means. The second embodiment differs from the first embodiment in that both the pair of positioning means 84 are provided with the position adjusting means 92. The configuration of the position adjusting means 92 is the same as that of the first embodiment. Therefore, the same reference numerals as in the first embodiment denote the same components in the drawings, and a description thereof will be omitted.

In the above configuration, the rotational position of either one of the liners 89 is varied, or the rotational positions of both of the liners 89 are varied in the opposite direction. For the same reason as described above, the inclination direction of the head heat generation line of the thermal head 82 is changed, and the head heat generation line can be aligned parallel to the roller axis line.

Further, by changing the rotation position (cam displacement amount) of both liners 89 by the same amount in the same direction, the notch of the head side positioning member 85 on both sides from the center (roller axis line) of both liners 89. By varying the distance to 85b, the positioning positions on both sides of the thermal head 82 move by the same amount in the recording medium transport direction. Therefore, since the head heat generation line moves in parallel in the recording medium conveyance direction, as shown in FIGS. 5A and 5B, the head heat generation line can coincide with the roller axis line when viewed from above.

By making the head heat generation line and the roller axis line coincide with each other, a stencil making pressure can be effectively applied between the platen roller 81 and the heat-sensitive head 82, so that the perforation of the stencil sheet 10 is improved. Further, by intentionally setting the interval between the head heat generation line and the roller axis line to a predetermined amount, the stencil making position of the stencil sheet 10 can be changed.

<Third Embodiment> FIG. 6 is a perspective view of a main part of a plate making apparatus according to a third embodiment. In FIG. 6, the third embodiment differs from the first and second embodiments in that the platen support member 83 has a plurality of screw holes 94 at predetermined circumferential intervals instead of arc-shaped screw insertion holes. Is different. Other configurations are the same.

According to the third embodiment, although the linear position cannot be continuously adjusted, the screw hole 94 can be set in a 360-degree area, and therefore, compared to the first and second embodiments. , The position adjustment range can be widened.

According to each of the above embodiments, the case where the platen roller 81 side is fixed and the thermal head 82 is movable with respect to the platen roller 81 is shown. Conversely, the thermal head 82 side is fixed and the platen roller 81 is fixed. The present invention can be applied to the case where the roller 81 is movable with respect to the thermal head 82 or the case where both the platen roller 81 and the thermal head 82 are movable.

According to each of the above embodiments, the case where the present invention is applied to the stencil printing machine plate making apparatus has been described. However, recording is performed by the platen roller 81 and the thermal head 82 other than the stencil printing machine plate making apparatus. For example, the present invention can be applied to a recording apparatus that performs recording using thermal paper generated by heat.

[0054]

As described above, according to the first aspect of the present invention, the recording medium is conveyed to the recording medium by selective heating by a platen roller for conveying the recording medium by rotation and a plurality of heating elements arranged in a straight line. A heat-sensitive head for forming an image, wherein the platen roller and the heat-sensitive head are relatively movably provided between a separated position for separating the heat-sensitive head from each other and a pressure contact position for pressing the recording medium through the recording medium; On both sides of the roller and the thermal head in the direction perpendicular to the recording medium conveyance direction, a pair of positioning means for canceling the mutual positioning at the separation position and positioning each other with respect to the recording medium conveyance direction at the pressing position are provided. In the recording apparatus, a positioning position of the thermal head and the platen roller in a recording medium transport direction is provided on at least one side of the pair of positioning means. In the case where the position adjusting means is provided on one of the pair of positioning means, the position of one of the pair of positioning means is changed in one of the recording medium conveying directions. The direction of inclination of the heating line changes, and the head heating line can be aligned parallel to the roller axis line.

In the case where the position adjusting means is provided on both of the pair of positioning means, the position of one recording medium in the conveying direction of the recording medium is changed by the one position adjusting means as described above, or The head heating line can be aligned in parallel with the roller axis line by changing the positioning position in both recording medium conveyance directions in the opposite direction by the position adjustment means, and both recording medium conveyance directions can be adjusted by both position adjustment means. By changing the positioning position of the head in the same direction, the head heating line can be moved in parallel in the recording medium transport direction, so that even if the direction of the heating element line of the thermal head varies, the recording position on the recording medium can be easily and accurately determined. it can.

According to the second aspect of the present invention, in the recording apparatus according to the first aspect, the positioning means is fixed to the heat-sensitive head, and a head-side positioning member which contacts the outer peripheral surface of the liner at the pressure contact position. A platen-side positioning member fixed to a platen support member that supports the platen roller, and having a liner supported on the same axis of the platen roller. The position adjusting unit biases the outer peripheral surface of the liner. As the core cam surface, and the rotation position of the liner is variable so that the platen-side positioning member can be freely attached to the platen support member, when one of the pair of positioning means is provided with position adjustment means, When the rotational position of one of the liners is adjusted to change the position of one of the liners in the recording medium transport direction, the head-side positioning member is brought into contact with the head. Located of the eccentric cam face of the liner inclination direction of the head heating line of the thermal head varies by the change can be adjusted in parallel head heating line to the roller shaft line.

When the position adjusting means is provided on both of the pair of positioning means, the rotational position of one of the liners is adjusted as described above to change the positioning position of the one recording medium in the conveying direction. Alternatively, by adjusting the rotational position of both liners and changing the positioning position in the recording medium conveyance direction in the opposite direction, the head heat generation line can be aligned parallel to the roller axis line, and both liners can be aligned. By adjusting the rotational position and changing the positioning position in both recording medium conveyance directions in the same direction, the head heating line can be moved in parallel in the recording medium conveyance direction, so that the direction of the heating element line of the thermal head varies. Also, the recording position on the recording medium can be easily and accurately adjusted.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a schematic configuration diagram of a stencil printing apparatus.

FIG. 2A is a plan view of a main part of a plate making unit according to a first embodiment of the present invention before position adjustment, and FIG. 2B is a right side view thereof.

FIG. 3A is a plan view of a main part after the position adjustment of the plate making unit according to the first embodiment of the present invention, and FIG. 3B is a right side view thereof.

FIG. 4A is a plan view of a main part of a plate making unit according to a second embodiment of the present invention before position adjustment, and FIG. 4B is a right side view thereof.

FIG. 5A is a plan view of a main part of a plate making section according to a second embodiment of the present invention after position adjustment, and FIG. 5B is a right side view thereof.

FIG. 6 is a perspective view of a main part of a plate making apparatus according to a third embodiment.

FIG. 7A is a front view of a main part of a plate making apparatus of a conventional printing apparatus, and FIG. 7B is a right side view thereof.

FIG. 8 is a diagram showing a positional relationship between a conventional head-side reference line and a heating element line.

[Explanation of symbols]

 Reference Signs List 1 stencil printing machine 3 stencil making unit (recording device) 10 stencil sheet 81 platen roller 82 heat-sensitive head 83 platen support member 84 positioning means 85 head-side positioning member 86, 87 platen-side positioning member 88, 89 liner 89a eccentric cam surface 92 Position adjustment means

Claims (2)

[Claims] A platen roller that conveys a recording medium by rotation; and a thermal head that forms an image on the recording medium by selective heating by a plurality of heating elements arranged in a straight line. The heat-sensitive head is provided relatively movably between a separation position for separating the heat-sensitive head from each other and a pressure-contact position for pressing the heat-sensitive head through the stencil sheet, in a direction orthogonal to a recording medium conveyance direction between the platen roller and the heat-sensitive head. On both sides, in the recording apparatus provided with a pair of positioning means for canceling the mutual positioning at the separated position and at the press contact position with respect to each other in the recording medium transport direction, at least one side of the pair of positioning means, Position adjustment means for adjusting the positioning position of the thermal head and the platen roller in the recording medium transport direction is provided. That the recording device. 2. The recording apparatus according to claim 1, wherein said positioning means is fixed to said thermal head and supports said platen roller and a head-side positioning member which abuts on an outer peripheral surface of a liner at said pressure contact position. A platen-side positioning member fixed to a platen support member and having a liner supported on the coaxial center of the platen roller, wherein the position adjusting means sets an outer peripheral surface of the liner as an eccentric cam surface, and A recording apparatus, wherein a rotation position of the liner is variable so that the platen-side positioning member can be attached to the platen support member.