JPH08132702A - Recorder - Google Patents

Abstract

PURPOSE: To simplify a mechanism for moving a recording medium while engaging with movement of a recording head. CONSTITUTION: A cutout gear 12b is provided on a part of an outer periphery of a bidirectional lead screw 12 for reciprocating a recording head by one revolution by a drive of a drive source, a conveying roller gear 8a of an overall gear is provided at a conveying roller 8 for moving the sheet of the medium, and the gear 12b is engaged with the gear 8a in association with rotation of the screw 12 to drive the roller 8 close to the gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, and more particularly to a serial type recording apparatus for recording while moving a recording head using a DC motor as a drive source.

[0002]

2. Description of the Related Art In a conventional recording apparatus, a reciprocating operation is linked with a driving source such as a DC motor in a small serial type recording apparatus for recording by reciprocating a recording head in parallel with a recording medium (sheet). A structure in which a rotating lead screw is used is often used. The forward and backward movements of the recording head movement are performed by the lead screw rotating a plurality of times. Further, for power transmission to the feed roller that conveys the recording paper, a gear or the like is provided at the end of the feed roller,
In most cases, it is transmitted from the drive source or the lead screw to the outer side in the width direction of the recording sheet via an intermediate gear or the like. In particular, in the case of a motor having a bidirectional lead screw provided with a groove in both directions and a configuration in which the reciprocating operation is performed by unidirectional rotation of the lead screw,
As a method for intermittently transmitting the paper feeding force, there are many methods in which a toothless gear is used and the toothless gear and all the toothed gears provided on the feed roller are intermittently meshed with each other.

As a drawback of the power transmission by the toothless gear, there is a problem of mechanical lock due to interference between tooth tips when the phase of the gear is deviated, but usually, as a countermeasure against this, parts such as a spring member are added. In many cases, the interference of the tooth tip is released, or it is divisible and no measures are taken.

[0004]

However, in the above-mentioned conventional example, since the forward and backward movements of the recording head are performed by a plurality of rotations of the lead screw, the rotational force of the lead screw is used to power the paper feeding system. In the case of intermittent transmission, since the paper feeding operation is performed once in response to a plurality of rotations of the lead screw, it is necessary to reduce the power from the lead screw to the paper feeding system by decelerating with a gear train or the like. Tends to be complicated.

Further, in the above-mentioned conventional example, since the power transmission to the paper feeding system is performed outside in the width direction of the recording paper, there is a tendency that the size of the feed roller of the paper feeding system in the longitudinal direction becomes large and the strength of the paper is reduced. ， It has the disadvantage that it is disadvantageous in terms of cost.

Further, as in the above-mentioned conventional example, as a drawback of power transmission of the paper feeding system, a spring member or the like is usually used as a countermeasure against mechanical lock due to interference between tooth tips when the phase of a gear shifts. Either a complicated mechanism is used for countermeasures or dicing, and there is a drawback that the cost is increased when the above-mentioned complicated mechanism is used, and reliability is lacking in terms of quality when no countermeasures are taken. It has drawbacks.

The present invention has been made in order to solve the problems of the above-mentioned conventional apparatus, and the recording head is moved in one direction with respect to the recording medium by one-direction rotation of the driving source, and recording for one line is performed. It is an object of the present invention to provide a recording apparatus having a simple drive configuration in which the recording medium is moved and the recording head is moved in the opposite direction when the drive source is rotated in the same direction.

[0008]

Therefore, in the recording apparatus according to the present invention, the recording head is moved in one direction with respect to the recording medium by one-way rotation of the drive source, and when one line of recording is performed, the drive is performed. A recording apparatus for performing recording in the next row after moving the recording medium and the recording head in the opposite direction by rotating the recording medium in the same direction, wherein the recording head is rotated by one rotation of a bidirectional lead screw. A bidirectional lead screw that reciprocally moves, and an intermittent drive unit that intermittently drives a transport roller that moves the recording medium in association with the rotation of the bidirectional lead screw. motion,
The present invention is intended to achieve the above-mentioned object by a configuration characterized in that the recording paper conveyance operation is completed by the lead screw making one rotation.

Further, the intermittent drive means includes a toothless gear provided on a part of the outer circumference of the bidirectional lead screw and a full-toothed gear that engages as the gear portion of the toothless gear approaches. A configuration provided on a part of a transport roller that moves a recording medium. Alternatively, the intermittent drive means is a protrusion provided on a part of the outer circumference of the bidirectional lead screw, and an annular elastic member that is pressed as the protrusion approaches, of a conveyance roller that moves the recording medium. The structure provided in part. Alternatively, the intermittent driving means moves the recording medium with a projecting rib provided on a part of the outer periphery of the bidirectional lead screw and a ratchet tooth that is engaged with the projecting rib as the projecting rib approaches. A structure provided on a part of the transport roller. Alternatively, the intermittent drive means
It is an object of the present invention to achieve the above-mentioned object by a structure characterized in that it is provided within the widthwise range of the recording medium to be moved.

Furthermore, the conveying roller is dropped into a substantially V-shaped receiving portion provided in a part of the base frame of the recording apparatus, and is pressed against a pinch roller provided at a position opposite to the receiving portion, so that the pinch roller is moved. It is an object of the present invention to achieve the above object by a structure in which a conveying roller is rotatably pressed against a base frame by a spring force of a pinch roller shaft which is rotatably supported.

[0011]

With the above structure, in the intermittent driving means of the recording apparatus for reciprocating the recording head by rotating the bidirectional lead screw in one direction, the lead screw makes one rotation for forward and backward movement and recording paper conveyance operation. A groove provided on the lead screw is formed so as to be completed by, for example, a toothless gear is provided as a drive gear of the recording paper transport system on a part of the outer periphery of the lead screw, and the recording paper on the forward and return paths is recorded. The power can be set to be transmitted to the driven side at a timing outside the range where the recording operation is performed.

Further, the toothless gear is provided within the range in the width direction of the recording paper. By providing the above means, it is possible to perform a series of operations including recording and recording paper conveyance by a simple mechanism, and it is possible to reduce the number of parts. Further, by setting the toothless gear within the range of the recording paper width direction, it is possible to reduce the dimension of the driven side component in the longitudinal direction, which is advantageous in terms of mechanical strength and cost.

Further, a driven gear that meshes with a toothless gear provided on the outer circumference of the lead screw is formed integrally or separately near the end portion of a feed roller (conveying roller) which is a recording sheet conveying means, and is separated from the feed roller. A pinch roller that rotates integrally and is provided at a position facing the feed roller is pressed against the feed roller by a spring force of a pinch roller shaft that supports the pinch roller, while the feed roller is a recording device. At the time of sheet conveying operation by normal meshing, it is dropped into a pair of substantially V-shaped receiving portions provided in a part of the main body base frame and fixed in position by pressure contact force from the pinch roller. , The feed roller rotates at a fixed position, but for some reason the phase shifts, and If the tooth tips to each other of the driven gear Dorora interferes feed roller is moved in the direction in which the interference is out defy the contact pressure, to return to the home position by the spring force of the pinch roller shaft when the interference is out. As described above, it is possible to prevent gear lock due to tooth tip interference between the toothless gear and the driven gear without increasing the number of special parts.

Incidentally, the intermittent driving means is not limited to the structure provided with the above-mentioned toothless gear, but the same structure may be adopted in which a projection is provided on a part of the outer periphery of the lead screw or a projection rib is provided. It works.

[0015]

【Example】

(First Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. The present embodiment is a serial type ink jet recording apparatus, and a detachable disposable recording head is used as the recording head used in the recording apparatus.

FIG. 1 is a plan view of a recording apparatus according to an embodiment, FIG. 2 is a front view, FIG. 3 is a left side view, FIG. 4 is a right side view (partial sectional view), and FIG. A front view of the screw, FIGS. 6, 7A and 7B are operation explanatory views of the paper feeding system, FIGS. 8 and 9 are timing charts showing operations of respective parts, and FIG. 10 is a control system of the recording apparatus. It is a block diagram.

First, a schematic structure of a recording apparatus will be described with reference to FIGS.

(Carriage) The recording apparatus applied to this embodiment is a serial type, and a carriage 4 is attached to a base frame 1 of the apparatus main body so as to be capable of reciprocating in the arrow P and Q directions. Is equipped with a recording head 2 which is a recording means described later. The carriage 4 is rotatably attached to a guide shaft 5 whose both ends are supported by the base frame 1. A bidirectional lead screw 12 is rotatably supported on the base frame 1. The lead screw 12 has 18
Screw-shaped screw grooves 12c and 12d with 0 ° different phases
Is formed, and the groove 12 is formed at the groove end portions 12e and 12f.
The c and the groove 12d are formed to be continuous. A projection 22a of a screw pin 22 rotatably provided at the front end of the carriage 4 is engaged with the screw grooves 12c and 12d (see FIGS. 4 and 5). A protrusion 4a having an L-shaped cross section is provided at the rear end of the carriage 4 so that the rail 1 formed on the base frame 1 is
The reciprocating movement of the carriage 4 is guided by the engagement with a. A screw wheel gear 12a is integrally formed at the left end of the bidirectional lead screw 12 (see FIG. 1).

(Conveying means) 8 is a conveying roller,
A recording sheet, which is a recording material, is conveyed. A transport roller gear 8a is attached to the right end of the transport roller 8 (see FIG. 1). Both ends of the transport roller 8 are rotatably dropped and supported by a pair of substantially V-shaped recesses 1b and 1c provided in a part of the base frame 1, and an elastic material (for example, An annular conveying member 9 made of a rubber material is provided (see FIG. 4). A pinch roller 14 is provided at a position facing the transport member 9. The pinch roller 14
Is rotatably supported by a pinch roller shaft 15, and the pinch roller shaft 15 is rotatably supported by the base frame 1 of the apparatus body. The pinch roller 14 is rotatable in the direction of arrow T shown in FIG. 4, and is pressed against the transport roller 8 by the elasticity of the pinch roller shaft 15. Therefore, when the transport roller 8 is rotated, the pinch roller 14 is also driven to rotate, and the recording sheet is transported by the cooperation work of both. Moreover, the shaft portions 8b and 8c of the transport roller 8 are rotatably pressed and fixed to the substantially V-shaped recesses 1b and 1c by the above-mentioned pressure contact force. The transport roller 8 is formed within the widthwise direction of the recording paper 23 (FIG. 1).

(Driving means) 11 is a DC motor which is a driving source, and is rotationally driven in the direction of arrow F shown in FIGS. A motor worm gear 13 is press-fitted and fixed to the drive shaft of the DC motor 11. The motor worm gear 13 meshes with the screw wheel gear 12a.

Further, as shown in FIGS. 1 and 4, a toothless gear 12b is provided at a part of the outer circumference of the bidirectional lead screw 12 at a position corresponding to the conveying roller gear 8a. Specifically, it is configured to mesh with the transport roller gear 8a and intermittently rotate the transport roller 8 in the direction of arrow S by a predetermined amount for each rotation of the lead screw.

With the above configuration, the DC motor 1 is provided.
By rotating 1 in the direction of arrow F, the bidirectional lead screw 12 rotates in the direction of arrow R in FIG. 3 via the motor worm gear 13 and the screw wheel gear 12a, and the screw pin 22 engaged with the screw groove 12c The carriage 4 moves in the direction of arrow P (see FIGS. 1 to 5).

When the carriage 4 further moves in the direction of arrow P and the screw pin 22 reaches and passes the screw groove 12e, the carriage 4 is engaged with the screw groove 12d continuous with the screw groove 12c. Moves in the direction of arrow Q.

When the carriage 4 further moves in the Q direction and the screw pin 22 reaches and passes the screw groove 12f, the carriage 4 moves in the arrow P direction by engaging with the screw groove 12c connected to the screw 12d. To do. By the above-described repeated operation, the carriage 4 reciprocates in the directions of arrows P and Q by the one-way rotation of the DC motor 11.

When the DC motor 11 rotates in the direction of arrow F, the toothless gear 12b provided on the outer circumference of the bidirectional lead screw 12 also rotates, and the width of the transport roller gear 8a and the width of the recording paper 23. The recording sheet is conveyed by driving the conveying roller 8 by intermittently meshing and rotatingly driving within the range of the direction. This recording paper transport operation is
The partly tooth-missing gear 12b is arranged so that it is performed when the carriage 4 is moved to the vicinity of both ends by the drive of the lead screw 6, that is, every time the recording of one line is completed.

The screw grooves 12c and 12d and the partly tooth-missing gear 12b are configured such that one line (one direction) recording and recording paper conveyance are carried out by rotating the lead screw approximately once. That is, each of the screw grooves 12c and 12d is formed by one turn, and both ends 12
They are continuously connected by e and 12f (see FIG. 5).

(Recording Unit) The recording unit forms and records an ink image on the recording sheet conveyed by the conveying unit. The recording unit in this apparatus is configured by an inkjet recording system in which ink is ejected from the recording head 2 to record.

In FIG. 4, a flexible circuit board 6 is attached to the carriage 4 and supplies an image signal and power to the recording head 2. The circuit board 6 is electrically connected to the recording head 2 by the set lever 3, and is connected to a control circuit (not shown) via the circuit board 20 and the flexible cable 30.

In FIGS. 1 and 2, 52 has a thickness of 0.1.
It is a metal plate of stainless steel or the like having a size of about 0.2 mm, and is a slit plate provided with grid-like slits formed by etching, pressing or the like. Reference numeral 21 is a slit plate holder for holding the slit plate 52 with small screws or the like,
It is fixed to the base frame 1 together with the slit plate 52. Then, the slits of the slit plate 52 are detected by the photo detector 16 described later and output as a discharge position detection signal.

The photo detector 16 is soldered to the above-mentioned circuit board (PCB) 20, and the carriage 4
It is fixed with screws and the like. Then, the movement state of the carriage 4 is detected by the photo detector 16 fixed to the carriage 4 detecting the slit of the slit plate 52 of the slit plate holder 21 fixed to the base frame 1.

The ejection position detection signal detected by the photo detector 16 is sent to a drive circuit board (control board) (not shown) by a flexible cable 30 soldered to the PCB 20, and the recording head 2 ejects ink. The position is controlled (Fig. 4).

Further, in FIGS. 1 to 3, a disc-shaped encoder slit 13a is integrally formed at the tip of the worm gear 13 and is provided in a groove of the photo detector 18 for generating a motor stop signal. It's getting in. 19
Is a substrate for soldering the photo detector 18,
It is fixed to the base frame 1 with screws or the like. The board 19 is connected to a control board (not shown) by a lead wire (not shown).

(Recording Operation) Next, the recording operation in this embodiment will be described. Note that FIG. 10 is a block diagram showing the configuration of the peripheral portion of the recording apparatus in this embodiment.
PU 70, keyboard 71, display 72, power supply unit 73, motor drive circuit 74, recording head drive circuit 7
5, a recording device 76. Recording device 76
As signals to be input to the CPU 70, the ejection position detection signal output from the photo detector 16 (photo detector of FIG. 4) and the motor stop output from the photo detector 18 (photo detector of FIG. 3) are output. There are two types of signals.

The motor drive circuit 74 constantly rotates the DC motor 11 in one direction based on a command from the CPU 70. Then, as is clear from the above description, the recording head 2 reciprocates left and right, and the recording sheet is conveyed by a predetermined amount unit each time the recording head 2 reaches the left and right ends. A series of recording operations is performed according to a program preset in a ROM (not shown).
It is executed under the control of U70.

When a voltage is applied to the DC motor 11 to start it, a motor stop signal is generated by the encode slit disk 13a formed integrally with the worm gear 13. Next, the carriage 4 starts to move in the arrow P direction from the right end of FIG. 1 by the rotation of the lead screw 12, for example. The carriage 4 starts moving, and the photodetector 16 fixed to the carriage 4 causes the slit 5 of the slit plate 52 to move.
When it starts passing through 2a, an ejection position detection signal corresponding to the slit 52a is generated. The ejection position detection signal is set to have a predetermined correspondence with each dot row in the dot matrix.

The CPU 70 receives the ejection position detection signal and selectively outputs a recording signal to the recording head drive circuit 75 in synchronization with the ejection position detection signal, thereby performing recording in the direction of arrow P in FIG. When the recording in the P direction is completed, the CPU 70 counts the number of pulses of the motor stop signal, counts N pulses, and then turns off the power supply to the DC motor 11. At this time, as described above, the recording sheet conveying operation has already been completed, and the carriage 4 stops at the left end of FIG. FIG. 8 shows a timing chart of the above recording operation sequence in the direction of arrow P.

Next, when the motor 11 is started again, the carriage 4 starts moving in the direction of arrow Q from the left end of FIG. 1 due to the rotation of the lead screw 12 described above. A motor stop signal is also generated at the same time when the motor 11 is activated. Further, the photo detector 59 is the slit plate 52.
An ejection position detection signal is generated by passing through the slit 52a, and in synchronization with this, the CPU 70 selectively outputs a recording signal to perform recording in the direction of arrow Q.

When the recording in the direction of the arrow Q is completed, the CPU 70 counts the number of pulses of the motor stop signal, counts M pulses, and then turns off the power supply to the motor 11. At this time, as described above, the recording sheet conveying operation is also completed, and the carriage 4 stops at the right end portion in FIG. FIG. 9 shows a timing chart of the recording operation sequence in the direction of arrow Q described above.

By repeating the above operation,
Recording on the recording sheet is performed. Further, the CPU 70 needs to determine in advance whether the carriage 4 is located at the left end or the right end in FIG. 1. The method is, for example, when the system is powered on, or for example, the all clear key. The CD motor 11 is energized when a specific key such as is pressed. Then, when the photodetector 59 passes through the wall portion 52b of the slit plate 52, a state X in which the ejection position detection signal is "low" continues for a certain period of time, and then the slit 52a is passed.
It is determined that the carriage 4 is moving in the direction of arrow P from the right end in FIG. In addition, the photo detector 16 is the slit plate 5
When passing through the second hole portion 52c, the discharge position detection signal continues to be in the "Y" state Y for a certain period of time, and then the carriage 4 is passed through the slit 52a. Judge that you are heading in the direction.

Hole 52c, wall 52b, slit 52a
The determination is made based on whether the state of “high” or “low” continues for a certain time or more, or whether the state of “high” or “low” is switched within a certain time. After determining the direction of arrow P or Q, after passing through the slit, count the number of pulses of N, M and motor stop signals respectively
If the power supply to the motor 11 is turned off, the initial operation can be ended. The numbers of pulses from the end of recording in the directions of the arrows P and Q to the stop of the driving of the DC motor 11 are N and M, respectively, but the numbers of pulses are basically set to the same value. However, it does not matter if a difference is made due to a difference in load or the like.

FIG. 6 shows the meshing state of the toothless gear 12b provided on the outer circumference of the lead screw with the conveying roller gear 8a. The lead screw 12 rotates in the direction of arrow R and the toothless gear 12b is shown in FIG. From the time you reach the position,
The power for rotating the transport roller 8 in the S direction is transmitted,
At the time of disengagement, the transmission force disappears (Fig. 7).
(B)). The meshed state in FIG. 6 is during normal operation.

However, as shown in FIG. 7A, when the transport roller gear 8a is stopped at the position shown in FIG. 7A for some reason, the tooth tip of the partly tooth-missing gear 12b is the gear 8a. It may cause interference with the tooth tips.

In this case, as described above, the transport roller 8 is dropped into the pair of substantially V-shaped recesses 1b and 1c (see FIG. 4) provided in a part of the base frame, and the pinch roller 14 is pinched. Due to the elasticity of the roller shaft 15, the roller shaft 15 comes into pressure contact with the transfer member 9 provided on the above-mentioned transfer roller 8, and due to this pressing force, the transfer roller 8 is rotatably supported by the base frame. Therefore, as for the above-mentioned interference between the tooth tips of the gears, the conveyance roller 8 causes the arrow Z in FIG.
By moving in the direction against the pressure contact force (spring force of the pinch roller shaft), the interference is released and the normal meshing is restored.

The spring force (pressure contact force) generated by the pinch roller shaft is set so that the center of rotation of the feed roller 8 does not move during normal meshing, but moves during tooth tip interference.

With the above structure, the recording can be carried out by driving the recording head and the conveying roller in a predetermined manner as described above.

(Second Embodiment) In the first embodiment, as a recording paper conveying means, a toothless gear is provided on a part of the outer periphery of the lead screw, and intermittently with a full-teeth gear that rotates integrally with the conveying roller. Although the sheet conveying operation is performed by meshing with each other, in the second embodiment, as shown in FIG. 11, the protrusion 26a is integrally or separately provided on the outer periphery of the lead screw, and is provided on the conveying roller side. A ring-shaped elastic member 27a is provided, and the rotation force is transmitted by frictional force of the ring-shaped elastic member 27a by intermittently rotating in contact with the protrusion 26a. Other parts are the same as those in the first embodiment.

With the above structure, the conveying roller can be smoothly driven intermittently without mechanical locking.

(Third Embodiment) In the third embodiment, as shown in FIG. 12, a protruding rib 28a is provided on the outer periphery of the lead screw, and a ratchet tooth 29a having a substantially right triangular shape is provided on the transport roller side. It is provided so as to rotate the transport roller when intermittently provided. Other parts are the same as those in the first embodiment.

With the above structure, it is possible to prevent gear lock and intermittently drive the conveying roller.

[0050]

As described above, according to the present invention,
The screw groove is configured with one line so that the recording head can be moved forward and backward with one rotation of the bidirectional lead screw by one rotation of the drive motor. A partly tooth-missing gear for sheet conveyance is provided, and at a position facing the partly tooth-missing gear, a conveyance roller gear (all teeth) that rotates integrally with the conveyance roller is provided. By engaging with each other at the end of the recording operation, power can be intermittently transmitted to the transport roller gear and the sheet can be transported.

Since the mechanical structure of the recording apparatus can be simplified, the number of parts can be reduced and the cost can be reduced.

Further, the position of the toothless portion provided on the outer circumference of the lead screw, the position of the transport roller gear provided at a part of the transport roller, and the support position of the transport roller in the base frame are set within the range in the width direction of the recording paper. By setting the above, it is possible to reduce the dimension of the transport roller in the longitudinal direction, and it is possible to increase the strength against bending and reduce the cost.

Further, both end portions of the transport roller are supported by a pair of substantially V-shaped bearing portions in the base frame, and a pinch roller provided at a position opposed to this is rotatably supported. Due to the spring force of the pinch roller shaft, the transport roller can be rotatably pressed and fixed via the transport member, and when the tooth tips of the tooth-missing gear and the tooth tips of the transport roller gear interfere with each other, the transport is performed. By moving the roller against the spring force of the pinch roller shaft and moving in the direction in which the interference is released, the interference is released and the normal meshing can be restored.

As described above, it is possible to prevent the input lock due to the interference between the tooth tips of the tooth-missing gear and the conveying gear without adding any special parts.

[Brief description of drawings]

FIG. 1 is a plan view of a recording apparatus that is an embodiment of the present invention.

FIG. 2 is a front view of an example.

FIG. 3 is a left side view of one embodiment.

FIG. 4 is a right side view of the example.

FIG. 5 is a front view of a lead screw.

FIG. 6 is an explanatory diagram of a sheet conveying operation.

FIG. 7 is an explanatory diagram of a sheet conveying operation.

FIG. 8 is a timing chart of a recording operation sequence.

FIG. 9 is a timing chart of a recording operation sequence.

FIG. 10 is a block diagram showing a configuration of a recording device.

FIG. 11 is an explanatory diagram of a sheet conveying mechanism according to a second embodiment.

FIG. 12 is an explanatory diagram of a sheet conveying mechanism according to a third embodiment.

[Explanation of symbols]

 1 Base Frame 2 Head 3 Set Lever 4 Carriage 5 Guide Shaft 7 Platen 8 Conveyor Roller 8a Conveyor Roller Gear 11 DC Motor 12 Bidirectional Lead Screw 12a Screw Wheel Gear 12b Screw Paper Feed Missing Gear 13 Motor Worm Gear 14 Pinch Roller 15 Pinch Roller Axis 16 Photo sensor 18 Photo sensor 22 Screw pin 23 Recording paper 52 Slit plate

Claims (6)

[Claims] 1. A recording head is moved in one direction with respect to a recording medium by one direction rotation of a drive source to perform recording for one line, and then the recording medium is moved and the recording head is rotated by the same direction rotation of the drive source. A bidirectional lead screw that moves the recording head in each of the forward and backward directions by substantially one rotation of the bidirectional lead screw driven by the drive source, and the rotation of the bidirectional lead screw. Equipped with an intermittent drive means for intermittently driving the transport roller that moves the recording medium in conjunction with the above, and completes the forward and backward movements of the recording head, the recording operation, and the recording paper transportation operation by the lead screw making one complete rotation. A recording device characterized by: 2. The intermittent drive means includes a toothless gear provided on a part of an outer periphery of the bidirectional lead screw, and a full-toothed gear that engages as a gear portion of the toothless gear approaches. The recording apparatus according to claim 1, wherein the recording apparatus is provided in a part of a conveyance roller that moves the recording medium. 3. The intermittent drive means moves the recording medium by a protrusion provided on a part of the outer circumference of the bidirectional lead screw and an annular elastic member that is pressed as the protrusion approaches. The recording apparatus according to claim 1, wherein the recording apparatus is provided in a part of the transport roller. 4. The intermittent driving means includes a protruding rib provided on a part of an outer periphery of the bidirectional lead screw, and ratchet teeth engaged with the protruding rib as the recording medium approaches. The recording apparatus according to claim 1, wherein the recording roller is provided in a part of a transport roller that moves the. 5. The recording apparatus according to claim 1, wherein the intermittent driving means is provided so as to be located within a widthwise range of the recording medium to be moved. 6. The transport roller is dropped into a substantially V-shaped receiving portion provided in a part of a base frame of a recording apparatus, and is pressed against a pinch roller provided at a position facing the receiving portion to rotate the pinch roller. 6. The recording apparatus according to claim 1, wherein the conveying roller is rotatably pressed against the base frame by a spring force of a pinch roller shaft which is freely supported.