JP2001080154A - Recording device - Google Patents

Abstract

(57) Abstract: A writing head can be positioned with high positional accuracy with respect to a platen roller even when the writing head has play, and wrinkles of a recording medium are prevented. SOLUTION: A recording medium is interposed between a platen roller 81 and a thermal head 82, and moves between a separation position at which the thermal head 82 is separated from the platen roller 81 and a press-contact position at which the thermal head 82 presses via the recording medium. The head-side positioning member 88 and the liner 89 are provided on the thermal head 82 and the platen roller 81, respectively. The head-side positioning member 88 and the liner are separated from each other at the separated position, and the positioning is released. A head-side positioning member 88 abuts on the liner 89 to provide a positioning means 87 for regulating the movement of the thermal head 82 in the recording medium transport direction and positioning the thermal head 82 in the recording medium transport direction, and between the thermal head 82 and the main body frame. A spring 90 for urging the thermal head 82 in the recording medium transport direction is interposed.

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 write head. The recording medium is conveyed by rotation of the platen roller, and an image is formed on the recording medium by the write 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 stencil making apparatus of a stencil printing apparatus is shown in FIGS. 4 and 5, FIG. 4 is a front view of a main part of the stencil making apparatus, and FIG. 5 is a side view thereof. 4 and 5, a stencil sheet 80 (shown in FIG. 5) as a recording medium is part of a transport path between a platen roller 81 and a thermal head 82 as a writing head. The platen roller 81 has a shaft 81a protruding to both sides rotatably supported by a platen support member 83 formed of a frame or the like, and the platen roller 81 is rotationally driven by the rotational force of a light pulse motor (not shown).

[0003] The thermal head 82 is supported by a head base member 84, and the tip of an arm member 85 is fixed to the head base member 84. The base end of the arm member 85 is fixed to a support shaft 86, and the support shaft 86 is rotatably supported by a main body plate (not shown). The thermal head 82 presses against the platen roller 81 via the stencil 80 around the support shaft 86 (solid line position in FIG. 5), and separate position (virtual line position in FIG. 5) away from the platen roller 81. It is provided so that it can be freely shifted between.
Positioning means 87 are provided on both sides of the platen roller 81 and the thermal head 82, respectively.

Each positioning means 87 includes a head-side positioning member 88 fixed to the thermal head 82 and a liner-89 as a platen-side positioning member supported on the shaft 81a of the platen roller 81. The head-side positioning member 88 is provided with a guide groove 88a having a vertical contact end surface 88b. The liner 89 has a cylindrical shape and is rotatably supported on the coaxial center of the platen roller 81.

In the above configuration, the thermal head 82 is
5 moves from the separated position indicated by the imaginary line to the pressure contact position indicated by the solid line in FIG. 5, the guide grooves 88 b of the pair of head-side positioning members 88 engage with the pair of liners on the platen roller 81 side.
89 at the press contact position, the contact end surfaces 88b of the pair of head side positioning members 88 are brought into contact with the pair of liner-8.
9.

During plate making, a plate making pressure acts on the thermal head 82 in a direction for urging the platen roller 81, and when the platen roller 81 rotates, the stencil sheet 80 is conveyed in the conveying direction shown by the arrow in FIG. Is done. The thermal head 82 is formed by the frictional force from the conveyed stencil sheet 80.
However, since the contact end face 88b of the head-side positioning member 88 is in contact with the liner 89, the thermal head 82 cannot be moved by being pulled in the recording medium transport direction. 82 and the platen roller 81 are always positioned at the same position.

[0007]

However, if there is play in the thermal head 82 with respect to the main body plate (not shown), immediately after the thermal head 82 is shifted from the separated position to the press-contact position, as shown in FIG. As shown, the contact end surface 88 of the head-side positioning member 88 of the thermal head 82
b may be separated from the liner 89 on the platen roller 81 side without contact. Also, during the plate making process,
For some reason (when the platen roller 81 is rotated in the opposite direction, or when the stencil sheet 80 is pulled in the opposite direction to the transport direction), even when an external force acts on the thermal head 82 in the opposite direction to the transport direction. In some cases, the contact end surface 88b of the head-side positioning member 88 of the thermal head 82 may be separated from the liner 89 on the platen roller 81 side without contact.

In such a case, the plate making mode is executed, and as described above, the external force in the transport direction acts on the thermal head 82, and the thermal head 82 moves in the transport direction by this external force, and the head-side positioning member 88 Positioning is performed only when the contact end face 88b contacts the liner 89.

Therefore, immediately after the thermal head 82 is shifted from the separated position to the pressure contact position or when an external force acts on the thermal head 82 in the direction opposite to the transport direction, the thermal head 82 and the platen roller 81 are always positioned at the same position. If the thermal head 82 and the platen roller 81 are not positioned at the same position, there is a problem that the plate making start position is shifted. This is an important improvement problem for an apparatus that requires printing position accuracy of a printed material.

Further, when the contact end surface 88b of the head side positioning member 88 of the thermal head 82 is shifted from a position away from the liner 89 on the platen roller 81 to a position where it abuts, the thermal head 82 is moved by the movement of the thermal head 82. The stencil sheet 80 may be wrinkled by applying an unreasonable external force to the stencil sheet 80.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and can position the write head with respect to the platen roller with high positional accuracy even if the write head has play. It is an object of the present invention to provide a recording device that can also prevent wrinkles from occurring.

[0012]

According to a first aspect of the present invention, there is provided a platen roller for conveying a recording medium by rotation, and a write head for forming an image on the recording medium, and the write head is attached to the platen roller. A head-side positioning member and a platen-side positioning member provided on the write head and the platen roller, respectively, between the separated position separated from the recording medium and a press-contact position pressed against the recording medium via the recording medium; In the position, the head-side positioning member and the platen-side positioning member are separated from each other to release the positioning. In the pressure contact position, the head-side positioning member contacts the platen-side positioning member to move the write head in the recording medium transport direction. A recording apparatus provided with a positioning means for performing positioning in a recording medium conveying direction by regulating the recording medium. Characterized in that a biasing means for biasing the saw head to the recording medium conveying direction.

In this recording apparatus, when the write head is shifted from the separated position to the pressure contact position, the write head is urged in the recording medium conveying direction by the urging means even if the write head has play. In the pressure contact position, the head-side positioning member is always located at a position where it comes into contact with the platen-side positioning member.Also, when the write head is in the pressure contact position, external force in the direction opposite to the recording medium transport direction is applied to the write head for some reason. Even when the write head is actuated, the write head is urged in the recording medium conveyance direction by the urging means, so that the position at which the head-side positioning member comes into contact with the platen-side positioning member is always maintained.

According to a second aspect of the present invention, in the recording apparatus according to the first aspect, the urging means is a spring.

In this recording apparatus, in addition to the operation of the first aspect of the present invention, a simple configuration in which a spring is arranged to bias the write head in the recording medium transport direction is sufficient.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram of a stencil printing machine having a stencil making device as a recording device.

In FIG. 1, the stencil printing apparatus 1 is mainly composed of a document reading section (not shown), a stencil making section 3, a printing section 4, a paper feeding section 5, a paper discharging section 6, and a stencil discharging section 7. I have.

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.
1 and a thermal head 82 which is a writing head disposed downstream of the stencil sheet 10 with respect to the stencil accommodation section 11 in the conveying direction.
And a platen roller 81 disposed at a position facing the thermal head 82 and rotated by a driving force of a write pulse motor (not shown). The attachment of the thermal head 82 and the platen roller 81 and the positioning means between them will be described in detail below.

The stencil making section 3 is disposed downstream of the platen roller 81 and the thermal head 82 in the direction of transport of the stencil sheet 10, and is rotated by a driving force of a write pulse motor (not shown). And a stencil cutter (not shown) disposed between the pair of stencil feed rollers 14 and the platen roller 81 and the thermal head 82.

The printing unit 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.
0 tip can be clamped. 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 the 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. An intermediate press roller 47 is rotatably supported by the roll support member 40. The intermediate press roller 47 has a pressing position (the state shown in FIG. 1) for pressing the screen 19 to the outer peripheral side, and a standby position for retreating inward from the screen 19. Transition between.

The roll support member 40 is provided with a doctor roll 51 and a drive 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 which is a printed material.

The paper supply unit 5 includes a paper supply table 23 on which print papers 22 as prints are stacked, a scraper 24 pressed from the paper supply table 23 to the uppermost print paper 22, and a downstream 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 only for the printing paper 22 at the highest position. 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 means for mounting the thermal head 82 and the platen roller 81 and positioning means therebetween will be described. FIG. 2 is a main part side view showing the vicinity of the thermal head 82 and the platen roller 81 of the plate making unit 3, and FIG. 3 is a plan view of the main part showing the vicinity of the heat sensitive head 82 and the platen roller 81 of the plate making unit 3.

2 and 3, the platen roller 8
1 is that a shaft 81a projecting to both sides is a platen support member 83
The platen roller 81 is rotatably driven by the rotational force of a light pulse motor (not shown). The thermal head 82 is supported by a head base member 84, and the tip of an arm member 85 is fixed to the head base member 84. The base end of the arm member 85 is fixed to a support shaft 86, and the support shaft 86 is rotatably supported by a main body plate (not shown).

The heat-sensitive head 82 is movable between a pressure contact position (solid line position in FIG. 2) where the heat-sensitive head 82 is pressed against the platen roller 81 via the stencil sheet 10 with the support shaft 86 as a center, and a separated position separated from the platen roller 81. It is provided in.
Positioning means 87 are provided on both sides of the platen roller 81 and the thermal head 82, respectively.

Each positioning means 87 has a head-side positioning member 88 fixed to the thermal head 82 and a liner-89 which is a platen-side positioning member supported on the shaft 81a of the platen roller 81. A guide groove 8 having a vertical contact end surface 88b is provided in the head-side positioning member 88.
8a are provided. The liner 89 has a cylindrical shape and is rotatably supported on the coaxial center of the platen roller 81. The head base member 8 of the thermal head 82
A spring 90 as urging means is interposed between the plate 4 and a main body plate (not shown), and the thermal head 82 is urged in the recording medium conveyance direction by the spring force of the spring 90.

Next, the operation of the stencil printing apparatus 1 will be briefly described. In the stencil making section 3, the stencil sheet 10 is arranged on a predetermined transport path by, for example, inserting the long stencil sheet 10 between the platen roller 81 and the heat sensitive head 82 with the thermal head 82 being in the separated position. Thereafter, the stencil sheet 10 is interposed between the platen roller 81 and the heat-sensitive head 82 with the thermal head 82 as a pressure contact position, and the platen roller 81 is rotated to place the stencil sheet 10 at the stencil setting position.

Next, the stencil sheet 10 is transported by the rotation of the platen roller 81 and the stencil feed roller 14, and the thermal head 8 is read based on image information read by a document reading section (not shown).
A large number of heating elements arranged on the two straight lines selectively generate heat to perforate heat-sensitive holes in the stencil sheet 10, and a predetermined position corresponding to one plate length of the stencil sheet 10 is cut into a stencil cutter (not shown). ) To make a stencil sheet 10 having a desired size.

In the printing section 4, the leading end of the stencil sheet 10 produced 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.

The paper supply section 5 conveys the printing paper 22 in synchronization with the rotation of the plate cylinder 16 and the paper cylinder 17, and clamps the leading end of the printing paper 22 by the paper clamp section 21 of the paper cylinder 17. And between the paper cylinder 17.

On the other hand, in the printing section 4, the middle press roll 47 is positioned at the press position during printing, and the plate cylinder 16 is rotated. 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 conveyed from the paper supply unit 5 between the plate cylinder 16 and the paper cylinder 17, and the conveyed printing paper 22 is moved between the intermediate press roll 47 and the paper cylinder 17. It is conveyed while being pressed together with the screen 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 leading 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 of the printing paper 22 is guided by the upper regulation guide section 30, or the leading end 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 outer peripheral surface of the screen 19 of the plate cylinder 16. However, in this case, the stencil paper clamp portion 18 of the plate cylinder 16 is released before the new stencil sheet having been stenciled 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 removed. The plate cylinder 16 is guided by a plate discharge guide belt 35 while rotating, and is conveyed by a pair of plate discharge conveyance belts 36 and stored in a plate discharge box 37.

In the mounting operation of the stencil sheet 10, when the thermal head 82 is shifted from the separated position to the pressure contact position side, the thermal head 82 is moved relative to the main body frame (not shown).
Since the thermal head 82 is urged in the recording medium conveyance direction by the spring force of the spring 90 even when there is an assembly play, the end faces 88b of the head-side positioning members 88 on both sides are pressed against the liners 89 on both sides at the pressure contact position. The thermal head 82 is located at a position where the thermal head 82 is always in contact with the outer peripheral surface, whereby the play is absorbed and the thermal head 82 is positioned by the platen roller 81 in the recording medium transport direction.

Accordingly, the rotation of the platen roller 81 does not cause the heat-sensitive head 82 to be displaced in the direction opposite to the recording medium conveyance direction, and no unreasonable external force acts on the stencil sheet 10 from the heat-sensitive head 82. As described above, even if the thermal head 82 has play, the thermal head 82 can be positioned with high positional accuracy with respect to the platen roller 81, and wrinkles of the long stencil sheet 10 can be prevented.

Further, even if the thermal head 82 is located at the pressure contact position and an external force acting on the thermal head 82 in a direction opposite to the recording medium transport direction acts on the thermal head 82 for some reason, the thermal head 82 is not moved by the spring 9.
Since the recording medium is urged by the spring force of 0 in the recording medium conveyance direction, the head-side positioning member 88 keeps the position where it is always in contact with the liner 89. Therefore, the thermal head 82 does not shift in the direction opposite to the recording medium transport direction due to the subsequent rotation of the platen roller 81, and the thermal head 8
Since the stencil sheet 10 does not apply an unreasonable external force to the stencil sheet 10, wrinkles of the stencil sheet 10 can be prevented.

Further, in the above embodiment, the thermal head 82
The urging means for urging the recording medium in the recording medium conveyance direction is constituted by the spring 90. Therefore, the spring 90 may be disposed between the thermal head 82 and the main body frame (not shown), so that the structure is simple and Easy to install.

Next, a modification of the plate making and plate making operations will be described. First, when the stencil sheet 10 is at the stencil setting position, the platen roller 81 and the stencil feed roller 14 are rotated to feed the leading end of the stencil sheet 10 to the position of the stencil clamping section 18, and the leading end of the stencil sheet 10 to the drum reference position. It is clamped by the stencil clamping part 18 of the plate cylinder 16 located. Next, the platen roller 81 is slightly rotated in the reverse direction to rotate the stencil sheet 1.
Take zero slack.

Next, the plate cylinder 16 and the platen roller 81
Are rotated in synchronism, the stencil sheet 10 is wound around and mounted on the plate cylinder 16, and when the rotation of the plate cylinder 16 reaches the stencil start rotation position, the thermal head 82 starts writing data to the stencil sheet 10. When the data writing of the thermal head 82 is completed and the rotation position of the plate cylinder 16 reaches the stencil cutting position, the rotation of the plate cylinder 16 and the platen roller 81 is stopped to cut the stencil sheet 10. When this cut is over, plate cylinder 1
6 and the platen roller 81 are rotated again to return the rotational position of the plate cylinder 16 to the drum reference position, in preparation for the printing operation.

By performing the stencil making and plate making operations in this manner, the substantial distance from the drum reference position of the plate cylinder 16 to the thermal head 82 is always constant irrespective of the leading end curl of the stencil sheet 10 and variations in the clamped state. Becomes the plate cylinder 16
Since the image formation start position of the stencil sheet 10 with respect to the rotation position can always be a fixed position, the printing accuracy is improved.

In the above operation process, the platen roller 81 is rotated in the reverse direction to remove the slack of the stencil sheet 10, and an external force acts on the heat-sensitive head 82 in the reverse direction of the recording medium conveyance direction by the reverse rotation. However, the thermal head 8
2 is urged in the recording medium conveyance direction by the spring force of the spring 90, so that the head-side positioning member 88
The position in contact with 89 is maintained. Therefore, the subsequent rotation of the platen roller 81 in the forward direction causes the thermal head 82 to rotate.
Does not shift in the direction opposite to the recording medium conveyance direction, and the thermal head 82 does not apply an unreasonable external force to the stencil sheet 10, so that wrinkles of the stencil sheet 10 can be prevented.

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

In the above embodiment, the urging means for urging the thermal head 82 in the recording medium transport direction is constituted by the spring 90. However, any means for urging the thermal head 82 in the recording medium transport direction may be used. A configuration other than the spring 90 may be used.

[0052]

As described above, according to the first aspect of the present invention, the recording medium is interposed between the platen roller and the write head, and the recording medium is separated from the write head with respect to the platen roller. The writing head and the platen roller are provided with a head-side positioning member and a platen-side positioning member, respectively. The head-side positioning member and the platen-side positioning member are provided at the separated position. The positioning member is released by separating from the member, and in the pressure contact position, the head-side positioning member abuts on the platen-side positioning member to regulate the movement of the write head in the recording medium conveyance direction, thereby positioning the recording medium in the recording medium conveyance direction. Biasing means for biasing said write head in a recording medium transport direction in a recording apparatus provided with positioning means for performing When the write head is moved from the separated position to the press-contact position, the write head is urged in the recording medium transport direction by the urging means even when the write head or the like has an assembly play. Even if the head-side positioning member is located at a position where it contacts the platen-side positioning member, and the write head is at the pressure contact position and an external force acts on the write head for some reason in a direction opposite to the recording medium transport direction. Since the write head is urged in the recording medium transport direction by the urging means, the head-side positioning member always maintains a position where it abuts on the platen-side positioning member. Positioning can be performed with high positional accuracy with respect to the platen roller, and wrinkling of the recording medium can be prevented.

According to the second aspect of the present invention, in the recording apparatus according to the first aspect, the urging means is constituted by a spring. Since a spring may be arranged to urge in the direction, the configuration is simple and the mounting is easy.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a stencil printing apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of a plate making section according to one embodiment of the present invention.

FIG. 3 is a plan view of a main part of the plate making section according to the embodiment of the present invention.

FIG. 4 is a front view of a main part of a stencil making apparatus of a stencil printing apparatus as a conventional recording apparatus.

FIG. 5 is a side view of a main part of a stencil printing machine as a conventional recording device.

FIG. 6 is a side view of a main part of a stencil printing machine as a conventional recording device, showing a state where a thermal head is not accurately positioned.

[Explanation of symbols]

 Reference Signs List 1 stencil printing device 3 stencil making unit (recording device) 10 stencil sheet 81 platen roller 82 thermal head 87 positioning means 88 head side positioning member 89 liner (platen side positioning member) 90 spring (biasing means)

Continued on front page F-term (reference) 2C058 AB05 AB16 AC06 AE02 AE04 AE07 AE09 AF31 DE07 2C064 CC02 CC06 CC11 EE01 EE11 2C065 AA01 AD07 CC05 CC32

Claims (2)

[Claims] A platen roller that conveys a recording medium by rotation; and a write head that forms an image on the recording medium, wherein a separation position at which the write head is separated from the platen roller and the recording medium are separated. The writing head and the platen roller are provided with a head-side positioning member and a platen-side positioning member, respectively. The head-side positioning member and the platen-side positioning member are provided at the separated position. Is released to release the positioning, and at the pressure contact position, the head-side positioning member abuts the platen-side positioning member to regulate the movement of the writing head in the recording medium transport direction, thereby positioning the recording medium in the recording medium transport direction. A recording device provided with a positioning means for performing the operation, wherein the write head is attached in a recording medium transport direction. Recording apparatus characterized by comprising biasing means for. 2. The recording apparatus according to claim 1, wherein said urging means is a spring.