JPH0392374A - Image processing machine fitted with thermal printing type printer - Google Patents

Abstract

PURPOSE:To certainly and stably position a thermal printing head and a backup means mutually by prescribing the relative position of the thermal printing head to the backup means in a feed direction and the relative angular position centering around a revolving axis in mutual cooperation when the second unit is set to a closed position. CONSTITUTION:When an intermediate unit is moved from an open position to a closed position, an annular collar member 124 is allowed to invade between a pair of legs 100 of a fork member 98 to position a thermal printing head 54 with respect to a roller 30 in a sufficiently precise state as required. The thermal printing head 54 is pressed to the roller by the elastic putting-aside action of an elastic putting-aside means. The printing line extending in the width direction of the thermal printing head 54 is made parallel to the center axial line of the roller 30 in a sufficiently precise state and the printing line of the thermal printing head 54 in the feed direction of thermal paper is set to a predetermined position with respect to the roller 30 in a sufficiently precise state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image processing machine such as a facsimile or a printer, and more particularly to an image processing machine equipped with a thermal printing device.

[Prior art]

2. Description of the Related Art In image processing machines such as facsimile machines and printers, it is widely practiced to use thermal paper as printing paper and to perform desired printing on the thermal paper using a thermal printing device. The thermal printing device includes a thermal printing head and a backup means by which the thermal printing head is pressed through thermal paper. Backup means are usually
It consists of a rotatably mounted roller. Thermal paper is generally in the form of a roll.

From the standpoint of loading thermal paper, cleaning or repairing the thermal print head and backup means, and handling when thermal paper is blocked, it is important that the thermal paper transport path through which thermal paper is transported is openable. Therefore, an image processing machine is constituted by at least two units, namely a first unit and a second unit mounted on the first unit so as to be movable between a closed position and an open position, When the unit is placed in the closed position, a thermal paper transport path is defined between the first unit and the second unit, and when the second unit is placed in the open position, the thermal paper transport path is defined. It forces them to open up. The thermal printing head and the backup means of the thermal printing device must be located opposite each other on both sides of the thermal paper transport path, and therefore the backup means is located at one of the first unit and the second unit. and the thermal print head is mounted on the other of the first unit and the second unit.

[Problems with conventional technology]

In a thermal printing device equipped with a thermal printing head and a backup means against which the thermal printing head is pressed, the thermal printing head must be sufficiently connected to the backup means in order to achieve the desired high-quality printing. It is important that it is precisely positioned and pressed against the backup means. To explain the positioning in more detail, the printing line extending in the width direction of the thermal print head is positioned at a predetermined position with sufficient precision in the transport direction of the thermal paper, and at a right angle to the transport direction of the thermal paper with sufficient precision. It is important that it extends across the thermal paper.

However, in the conventional image processing machine, one of the first unit and the second unit is equipped with the backup means, and the other of the first unit and the second unit is equipped with the thermal print head. Primarily due to their relative freedom of movement, it is extremely difficult, if not impossible, to position the thermal print head with sufficient precision relative to the backup means, or it may require a fairly complex and expensive mounting mechanism. It was necessary to adopt it. Further, when the second unit is repeatedly opened and closed relative to the first unit, variations in the position of the thermal print head relative to the backup means are often generated.

[Problem of invention]

The present invention has been made in view of the above-mentioned facts, and its main technical problem is to improve the image processing machine of the above-mentioned form, and to provide a first unit and a second unit equipped with backup means.
Although one of the units and the other of the first unit and second unit to which the thermal print head is attached are relatively movable, a complicated and expensive attachment mechanism is required. The thermal print head can be positioned with sufficient precision relative to the backup means, and the thermal print head can be positioned with sufficient precision relative to the backup means, and repeated opening and closing of the second unit relative to the first unit may be performed without sufficient precision of the thermal print head relative to the backup means. This is to ensure that the positioning is maintained.

[Means for solving the invention]

The solution of the present invention is as follows: (1) A thermal print head is mounted so as to be movable in a straight line in the pressing direction perpendicular to the backup means and in the conveyance direction of the thermal paper, and to be rotatable about a rotation axis extending in the pressing direction. (2) composed of a regulating member disposed on the backup means and a regulated member disposed on the thermal printing head, which cooperate with each other when the second unit is placed in the closed position; A positioning means is provided for regulating the relative position of the thermal printing head with respect to the backup means in the transport direction and the relative angular position about the pivot axis.

That is, according to the present invention, {f1 is located between the first unit and the closed position in which the first unit cooperates with the first unit to define a thermal paper conveyance path between them, and the open position in which the thermal paper conveyance path is opened. and a second unit movably attached to the first unit, and a backup means for the thermal printing device is attached to one of the first unit and the second unit. The thermal printing head of the thermal printing device is mounted on the other of the first unit and the second unit, and when the second unit is placed in the closed position, the elastic biasing means In an image processing machine in which the thermal print head is pressed against the backup means via thermal paper by the action of It is mounted so as to be movable in a straight line in the pressing direction perpendicular to the direction of the thermal paper and in the conveying direction of the thermal paper, and to be rotatable about a rotation axis extending in the pressing direction, and to connect the regulating member disposed in the backup means and the heat-sensitive paper. and a regulated member disposed on the print head, and when the second unit is placed in the closed position, they cooperate with each other to reduce the relative position of the thermal print head with respect to the backup means in the transport direction. An image processing machine is provided, characterized in that it is equipped with a positioning hand that regulates a target position and a relative angular position about the rotation axis.

[Action of the invention]

In the image processing apparatus of the present invention, when the second unit is placed in the closed position with respect to the first unit, the regulating member and the regulated member constituting the positioning means cooperate to The thermal print head is regulated in a predetermined position, thus positioning the thermal print head in a predetermined position.

Therefore, as long as the arrangement position of the regulating member with respect to the backup means and the arrangement position of the regulated member with respect to the thermal printing head are set with sufficient precision, the second unit can be repeatedly opened and closed with respect to the first unit. However, the thermal print head can be positioned precisely enough for the backup means to be in the required position. The structure of the regulating member and the regulated member constituting the positioning hand as well as the mounting style of the thermal print head may be relatively simple and inexpensive, and the production cost will not increase significantly due to these.

[Preferred specific example]

Hereinafter, a preferred embodiment of the present invention embodied as a facsimile will be described in further detail with reference to the accompanying drawings.

Referring to FIG. 1, the illustrated facsimile machine includes a lower unit (first unit) 2, an intermediate unit (second unit) 4, and an upper unit (third unit).
It consists of 6.

The lower unit 2 includes a lower housing 8 which can be formed from any suitable synthetic resin material. The lower housing 8 has a flat bottom wall 10, and support legs 12 are formed at the four corners of the lower surface of the bottom wall 10. An earthen wall structure 6 having a stepped portion 14 is formed on the upper surface of the rear half (left half in FIG. 1) of the lower housing 8. In the space existing between the bottom wall 10 and the top wall 16, a drive source 18, which may be an electric motor, and various electrical control elements (not shown) are arranged. An additional member 20 is fixed onto the rear portion of the earthen wall 16 by a set screw (not shown). A document tray 22 is removably attached to the center portion of the additional member 20 in the width direction, and is inclined upward and extends rearward. A concave wall 24 that defines a thermal paper loading section that is separated from the concave section and has a substantially semicircular cross section is present in a portion slightly forward of the center of the lower housing 8 .

A thermal paper roll 26 is rotatably loaded onto this concave wall 24. There is a guide wall 28 extending forward some distance substantially horizontally from the leading edge of the concave wall 26. A roller 30 is rotatably mounted in front of the guide wall 28. This roller 30 is driven by the drive source l8.
It is drivingly connected to and is driven to rotate in the direction shown by the arrow. As will be clearly understood from the following description, the roller 30 functions as a transport roller for transporting the thermal paper unwound from the thermal paper roll 26, and also serves as a backup roller for a thermal printing device, generally designated by numeral 32. It functions as a means. A guide plate 34 is installed in front of the roller 30, and a cutting means 36 is installed further in front of this guide plate 34.
is installed. The cutting means 36 is composed of a stationary blade 40 fixed to a support member 38 and a movable blade 42 mounted so as to be able to swing back and forth. The movable blade 42 is drivingly connected to a suitable drive source (not shown), and can be reciprocated and pivoted as appropriate between a stop position shown by a solid line and a cutting completion position shown by a two-dot chain line. A discharge opening 44 is formed in the front surface of the lower housing 8.

A pair of mounting brackets 46 (one of which is shown in FIG. 1) is fixed on the earthen wall 16 of the lower unit 2 at intervals in the width direction.
6 is fitted with a substantially horizontally extending support pin 48. The intermediate unit 4 includes a frame 50 mounted on the support pin 48 so as to be pivotable between a closed position shown by a solid line and an open position shown by a two-dot chain line. A guide plate 5 is provided at the front lower part of the frame 50 (lower right in FIG. 1).
2. A thermal printing head (thermal head) 54 of the thermal printing device 32 and a guide plate 56 are provided. The guide plate 52, thermal print head 54, and guide plate 56 in the intermediate unit 4 are connected to the guide wall 28 in the lower unit 2 when the intermediate unit 4 is placed in the closed position shown by the solid line.
It cooperates with the roller (backup means) 30 and the guide plate 34 to define a thermal paper transport path 58 between them. Information board 52
is positioned adjacent to and above guide wall 28, thermal print head 54 is pressed against roller 30, and guide plate 56 is positioned adjacent to and above guide plate 34. The manner in which the thermal printing head 54 of the thermal printing device 32 is mounted will be described in more detail below.

Guide plates 60 and 62 are disposed at the rear upper part of the frame 50 of the intermediate unit 4 (upper left in FIG. 1). Furthermore, a feed roller 64, a feed roller 66, a document reading means 68, and a discharge roller 70 are arranged in sequence toward the rear. The feed roller 64, the feed roller 66, and the ejection roller 70 are rotatably mounted, and the feed roller 64 and the feed roller 66 are made to protrude upward through openings formed in the guide plate 60. The discharge roller 70 is projected upward through an opening formed in the guide plate 62.

The feed roller 64, the feed roller 66, and the discharge roller 70 are drive-connected to the drive source 18 provided in the lower unit 2 via appropriate drive connection elements (not shown). , is driven to rotate in the direction shown by the arrow.

The document reading means 68 can be read from an optical reading head having a number of optical elements (which may be a combination of light emitting diodes, selfoc lenses and CCDs) arranged in parallel in the width direction.

The frame body 50 of the intermediate unit 4 is equipped with support pins 72 which are disposed on both sides in the width direction and extend substantially horizontally. The upper unit 6 includes a frame 74 attached to the support pin 72 so as to be pivotable between a closed position shown by a solid line and an open position shown by a two-dot chain line. A guide plate 76 is provided on the lower surface of the frame 74 of the upper unit 6.

When the upper unit 6 is brought to the closed position shown by the solid line,
The guide plate 76 is the same as the guide plate 60 in the intermediate unit 4.
and 62 and located above them, and defines a document conveyance path 78 between them. The upper unit 6 further includes:
A pressing piece 80 and a separating piece 82 are located in sequence toward the rear.
, a conveyance roller 84 and a discharge port roller 86 are provided. Pressing piece 8o that can be formed from a suitable resin
protrudes downward through an opening formed in the guide plate 76, and is pressed by the feed roller 64 in the intermediate unit 4. A separating piece 82, which can be made of a material with a high coefficient of friction such as rubber, is attached to the guide plate 7.
It projects downwardly through an opening shaped like 6 and is pressed against a feed roller 66 in the intermediate unit 4 . The conveyance roller 84 protrudes downward through an opening formed in the guide plate 76 and is pressed against the surface of the document reader fIt68 in the intermediate unit 4. A discharge roller 86 also projects downwardly through an opening formed in the guide plate 76, and is connected to the discharge roller 86 in the intermediate unit 4.
70 is pressed. The conveyance roller 84 and the discharge roller 86 are also drivingly connected to the drive source 18 in the lower unit 2 via appropriate driving coupling elements (not shown), and are rotationally driven in the direction shown by the arrow. Although not shown, an operation panel is provided on the upper surface of the frame 74 of the upper unit 6, and this operation panel is provided with various imitation keys such as numeric keys and a plurality of displays. ing.

The operation of the illustrated facsimile machine is as follows.

When transmitting or receiving by facsimile, the intermediate unit 4 is placed in the closed position shown by the solid line, and the upper unit 6 is also placed in the closed position shown by the solid line. When transmitting a predetermined document, a plurality of documents to be transmitted are stacked as required with the side with the image to be transmitted facing downward, and placed on top of the front upper surface of the frame 50 in the intermediate unit 4. A document transport path 78 is placed between the intermediate unit 4 and the upper unit 6.
More specifically, the feed roller 64 and the pressing piece 80
It is inserted into the interaction site with. Next, perform the necessary operations such as calling the destination and start the actual transmission.
The feed roller 64, feed roller 66, conveyance roller 84, and discharge rollers 70 and 86 are rotated in the direction of the arrow. Then, by the action of the feed roller 64 and the pressing piece 80, as well as the action of the feed roller 66 and separation piece 82 disposed downstream of these, each document is separated one by one starting from the lowest document and sent downstream. be provided. The fed original is further conveyed by the action of the conveying roller 84 pressed against the surface of the original reading means 68, and at this time, the original reading means 68 reads the image of the original.

Thereafter, the original is discharged onto the original tray 22 by the action of the discharge rollers 70 and 86. When a document becomes blocked in the document transport path 78, or when cleaning the document reading means 68, transport roller 84, etc., the upper unit 6 is
The document conveying path 78 can be opened by placing the document conveying path 78 in the open position shown by the dotted chain line.

In the case of reception, the leading end of the thermal roll 26 loaded in the lower unit 2 is unwound and led out to the thermal paper conveyance path 58 . More specifically, between the guide wall 28 and the guide plate 52, between the roller (backup means) 30 and the thermal print head 54, between the guide plate 34 and the guide plate 56, and also between the stationary blade 40 and the cutting means 36. It is led out through between the blade 42 and the blade 42.

When the document image signal is received, the roller 30 against which the thermal print head 54 is pressed is rotated in the direction of the arrow.
As a result, the thermal paper is gradually unwound to the thermal paper transport path 58.
transported through. At this time, the thermal print head 54 prints on the thermal paper in accordance with the received signal. The printed thermal paper is discharged from a discharge opening 44 formed on the front surface of the lower housing 8 of the lower unit 2. When a predetermined length of thermal paper is unwound, the movable blade 42 of the cutting means 36 is rotated back and forth, and the unwound thermal paper is separated from the thermal paper roll 26. When the thermal paper is blocked in the thermal paper transport path 58, when loading the thermal paper roll 26 into a required part of the lower unit 2, or when cleaning the thermal print head 54, etc., the intermediate unit 4 is moved at two points. The thermal paper conveying path 58 can be opened by bringing it to the open position shown by the chain line.

Therefore, the above-described structure and operation of the illustrated facsimile do not constitute novel improvements according to the present invention, but are merely examples of the structure and operation of a facsimile to which the novel improvements according to the present invention can be applied. This is merely an example, and therefore a detailed explanation of the above-mentioned construction and operation is omitted herein.

Next, with reference to FIG. 2 to FIG. 4 together with FIG. 1, the manner in which the thermal printing head 54 is mounted in the thermal printing device 32 will be described. A mounting frame 88 extending in the radial direction above the thermal printing head 54, which is of a well-known configuration and extending in the width direction, is fixed by suitable means such as adhesive or set screws. . At the center of the mounting frame 88 in the width direction, there is a protrusion 90 that protrudes rearward.
is formed. A mounting slot 92 is formed in the protrusion 90, which may have a rectangular shape. The mounting slot 92 is located at the center of the mounting frame 88 in the width direction, and therefore at the center of the thermal printing head 54 in the width direction. The attachment elongated hole 92 is elongated in the direction of conveyance of the thermal paper (the tangential direction of the roller 30 in FIG. 1). A pair of guided pieces 94 are formed at the front edge of the mounting frame 88 at intervals in the width direction. Each of the guided pieces 94 may be a rectangular piece that protrudes upwardly and then forwardly. On the upper surface of the main part of the mounting frame 88, three spring receivers are provided at appropriate intervals in the width direction. Protrusion 9
6 are arranged. Further, on both sides of the mounting frame 88 in the width direction, fork members 98 that project downward are formed. Each of the fork members 98 for guarding the member to be regulated has a pair of legs 100 extending parallel to each other at a predetermined interval.

On the other hand, inside the frame 50 of the intermediate unit 4,
A support frame 102 is provided. A mounting piece 104 is disposed within the earthen wall of the support frame 102, and is formed by bending a rectangular area defined by the three cut sides and slanting it slightly downward. This mounting piece 10
A screw hole 106 is formed in the center of 4. On the front part of the earthen wall of the support frame 102, there are three spring receiving protrusions 108 that protrude downward at appropriate intervals in the width direction in correspondence with the spring receiving protrusions 96 of the mounting frame 88. It is formed. A hanging wall 109 hanging downward is formed at the front end of the support frame 102.
A pair of guide openings 110 are formed at intervals in the width direction in correspondence with the guided pieces 94 of the mounting frame 88.

Each of the pair of guide openings 110 may have a rectangular shape.

The thermal print head 54 is attached to the intermediate unit 4 by attaching the attachment frame 88 to the support frame 102 using the attachment member 112 .

The mounting member 112 has an enlarged head 114, a mounting shaft 116, and a threaded end shaft 118. The mounting shaft portion 116 has an outer diameter corresponding to the width dimension of the mounting slot 92 formed in the mounting frame 88, and also has an outer diameter corresponding to the width dimension of the mounting slot 92 in the penetrating direction (therefore, the width of the mounting slot 92). The length in the axial direction is somewhat larger than the thickness of the protrusion 90. The outer diameter of the tip screw shaft portion 118 is smaller than the width dimension of the mounting elongated hole 92.

As clearly shown in FIG. 4, the distal end threaded shaft portion 118 of the mounting member 112 passes through the long mounting hole 92 of the mounting frame body 88 and is screwed into the threaded hole 106 of the support frame body 102. The mounting frame 88 is thus mounted on the support frame 102. The mounting shaft portion 116 of the mounting member 112 is attached to the mounting frame 8
It is inserted into the long mounting hole 92 of No.8. In this way, the mounting frame 88 (and the thermal printing head 54 fixed thereto) can freely move straight in the axial direction of the mounting member 112 (this direction is the direction in which the thermal printing head 54 is pressed by the roller 30). (Attachment shaft portion 116 of attachment member 112
The axial dimension of the mounting slot 92 is somewhat longer than the penetration direction dimension of the mounting slot 92), and the mounting slot 92 is movable in the extending direction of the mounting slot 92 (this direction is the conveying direction of the thermal paper). The member 112 is attached to the support frame 102 so as to be pivotable about the axis of the member 112. The guided piece 94 of the mounting frame 88 is engaged with the guide opening 110 of the support frame 102, thus guiding the linear movement of the mounting frame 88 in the axial direction (pressing direction) of the mounting member 112. Mounting frame 88
An elastic biasing means 120, which may be a coil spring, is interposed between each of the spring receiving projections 96 of the support frame 102 and each of the spring receiving projections 108 of the support frame 102. The elastic biasing means 120 moves the mounting frame 88 (therefore the thermal print head 54 fixed thereto) in the axial direction of the mounting member 112, and the roller or backup means 30 when the intermediate unit 4 is in the closed position. (in a direction substantially perpendicular to ) to force thermal print head 54 against roller 30 .

Continuing the explanation with reference to FIGS. 3 and 4 together with FIG. The roller 30 is attached to 122. A pair of annular collar members 124 located on both sides of the roller 30 are further rotatably mounted on the rotating shaft 122. The annular collar member 124 constitutes a regulating member that cooperates with the fork members (regulated members) 98 disposed on both sides of the mounting frame 88. The outer diameter of the annular collar member 124 is the same as that of the fork member (regulated member) 9.
This corresponds to the distance between the pair of legs 100 at 8. As will be clearly understood from the following explanation, the regulated member constituted by the fork member 98 and the regulating member constituted by the annular collar member 124 are arranged so that the thermal printing head 54 is A positioning means 126 is provided for positioning the object with sufficient precision as required. As can be easily understood by referring to FIGS. 3 and 4, the intermediate unit 4 is moved from the open position shown by the two-dot chain line in FIG. 1 to the closed position shown by the solid line in FIG. Then, the annular collar member 124 is inserted between the pair of legs 100 of the fork member 98, and thus the roller 3
0, the thermal print head 54 is positioned with sufficient precision as desired. The thermal printing head 54 is then pressed against the roller 30 by the elastic biasing action of the elastic biasing mechanism 120 . To explain the above position in more detail,
Since the relative positions of the fork member 98 and the annular collar member 124 in the thermal paper conveyance direction are regulated on both sides in the width direction, the printing line extending in the width direction on the thermal printing head 54 is aligned with the central axis of the roller 30. The print lines of the thermal print head 54 are made parallel to each other with sufficient precision, and the printing lines of the thermal print head 54 are also placed at a predetermined position with respect to the roller 30 with sufficient precision in the conveying direction of the thermal paper (the tangential direction of the roller 30). Such positioning of the thermal print head 54 is achieved by fork members (regulated members) 98 with respect to the thermal print head 54.
As long as the position of the annular collar member 124 and the position of the annular collar member 124 with respect to the roller 30 are set with sufficient precision, the operation can be carried out reliably, stably, and with sufficient precision. Even if there is an error in the mounting position of the intermediate unit 4 with respect to the lower unit 2, and the opening/closing movement of the intermediate unit 40 with respect to the lower unit 2 is repeatedly performed, the mounting position of the intermediate unit 4 may vary. However, the required positioning of the thermal print head 54 relative to the roller (backup hand) 30 is not compromised.

〔Effect of the invention〕

In the image processing machine configured according to the present invention, the unit to which the backup means of the thermal printing device is installed and the unit to which the thermal printing head of the thermal printing device is installed are relatively movable in opening and closing. Nevertheless, by adopting a unique style for mounting the thermal print head and providing a positioning means for regulating the relative position of the thermal print head and the backup means, and are reliably and stably positioned with respect to each other with sufficient precision so that a reliable and stable good printing is achieved. The mounting style adopted for mounting the thermal print head and the positioning means provided for the mutual positioning of the thermal print head and the backup means are relatively simple and inexpensive; The manufacturing cost of the image processing machine does not increase significantly.

[Brief explanation of drawings]

FIG. 1 is a simplified sectional view showing a facsimile machine which is a preferred example of an image processing apparatus constructed according to the present invention. FIG. 2 is a partially exploded perspective view showing how the thermal print head is mounted in the facsimile machine of FIG. Fig. 3 is a partial perspective view showing the mutual relationship between the thermal print head and the backup means (roller) in the facsimile shown in Fig. f. Fig. 4 shows the mounting style of the thermal print head in the facsimile shown in Fig. A partial sectional view showing the mutual relationship between the head and the backup means (roller). 2. 4. 6. 30. 32. 58. Lower (first) unit intermediate section (second) upper unit (third) Unit roller (backup means) Thermal printing device thermal paper conveyance path 68・ ・ ・ ・ 78・ ・ ・ 88・ ・ ・ 92・ ・ ・ ・ 94・ ・ ・ ・ 98・ ・ ・ 100 ・ ・ ・ 102・ ・ ・ 106 ・ ・ ・ 110 ・ ・ ・ 112 ・ ・ 114 ・ ・ ・ 116 ・ ・ ・ 118 ・ ・ ・ 120 ・ ・ ・ 124 ・ ・ ・ 126 ・ ・ ・ ・ Original reading means, original transport path, mounting frame Body, long mounting hole, guided piece, fork member (regulated member), leg of fork member, support frame, screw hole, guide opening, mounting member, enlarged head of mounting member, mounting shaft of mounting member, Screw shaft at the end of the mounting member, elastic biasing means, annular collar member (regulating member), positioning means, Figure 4, Figure 122

Claims (1)

[Claims] 1. Between a first unit and a closed position that cooperates with the first unit to define a thermal paper transport path between them and an open position that opens the thermal paper transport path. and a second unit movably attached to the first unit, and a backup means for the thermal printing device is attached to one of the first unit and the second unit. The thermal printing head of the thermal printing device is mounted on the other of the first unit and the second unit, and when the second unit is placed in the closed position, the elastic biasing means In an image processing machine in which the thermal print head is pressed against the backup means via thermal paper by the action of It is mounted so as to be movable in a straight line in the pressing direction perpendicular to the direction of the thermal paper and in the conveyance direction of the thermal paper, and to be rotatable about a rotation axis extending in the pressing direction, and to connect the regulating member disposed in the backup means and the heat-sensitive paper. and a regulated member disposed on the print head, which cooperate with each other when the second unit is placed in the closed position.
An image processing machine characterized in that the image processing machine is equipped with a positioning means for regulating the relative position of the thermal print head in the transport direction and the relative angular position about the rotation axis with respect to the backup means. 2. The other of the first unit and the second unit includes a support frame, the thermal print head includes a mounting frame, and the mounting frame is attached to the support frame via a mounting member. The mounting frame is formed with a long mounting hole that penetrates in the pressing direction and extends in the transport direction, and the mounting member has a width corresponding to the width of the enlarged head and the long mounting hole. The mounting shaft of the mounting member is composed of a mounting shaft portion having an outer diameter and an axial length larger than the penetration direction dimension of the mounting elongated hole, and a tip screw shaft portion having an outer diameter smaller than the width of the mounting elongated hole. 2. The image processing apparatus according to claim 1, wherein the threaded end member is positioned in the long mounting hole, and the threaded end member inserted through the long mounting hole is fixed to the support frame. 3. The image processing machine according to claim 2, wherein the mounting elongated hole is formed approximately at the center in the width direction of the thermal printing head. 4. The support frame is formed with a guide opening extending in the pressing direction, and the mounting frame has a guided piece that is engaged with the guide opening so as to be movable in the pressing direction. The image processing machine according to claim 2 or 3, wherein the image processing machine is formed. 5. The backup means is composed of a rotatably mounted roller, and the regulating member of the positioning means is
an annular collar member mounted on both sides of the roller concentrically with the roller; the regulated member of the positioning means is a fork member mounted on both sides of the thermal print head;
The fork member has a pair of legs whose width corresponds to the outer diameter of the annular collar member, and by inserting the collar member between the pair of legs, the relative position of the thermal print head in the conveyance direction is adjusted. 5. The image processing apparatus according to claim 1, wherein a target position and a relative angular position about the rotation axis are regulated.