JP3082818B2 - Ink jet recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus, and more particularly to a technique for switching power when a paper feed mechanism and a suction mechanism are driven by a single motor.

[0002]

2. Related Background Art In an ink jet recording apparatus, since ink droplets are ejected from nozzles to perform printing, clogging of nozzles causes printing to be impossible. For this reason,
A suction mechanism for sealing the recording head by a capping mechanism to which a negative pressure is supplied from a suction pump and forcibly discharging ink is provided. Since such a suction operation is performed during non-printing, the suction mechanism is usually driven by transmitting the power of a motor for driving the paper feed mechanism by a switching mechanism. FIGS. 9 and 10 each show an example of a mechanism for transmitting power from the paper feed drive motor to the suction mechanism. In FIG. 9, reference numeral 101 denotes a paper feed roller, which rotates in the direction of the arrow by a paper feed drive motor (not shown) to convey the recording paper. A sun gear 102 is fixed coaxially with the paper feed roller 101, and the sun gear 1
02 and the planetary gear 106 are meshed by the planetary lever 103. Reference numeral 107 denotes a pump transmission gear connected to the drive system of the suction mechanism. In such a configuration,
During normal paper feeding, the cap holder 104 is connected to the planetary lever 1
03 and the paper feed roller 1
Even if 01 rotates, the rotation is not transmitted to the suction mechanism. In order to operate the suction mechanism, first, when the carriage on which the recording head (not shown) is mounted moves in the Z direction, the engaging portion of the cap holder 104 and the planetary lever 1 are moved.
03 is disengaged. Therefore, at this position, the head is covered with the cap 105, and the head is ready for suction. When the paper feed roller 101 is rotated in the direction opposite to the direction of the arrow in this state, the planetary lever 103 operates, and the planetary gear 106 and the pump transmission gear 107 mesh. Therefore, power is transmitted to the suction mechanism. Thus, the suction mechanism is operated by the paper feed drive motor.

In FIG. 10, reference numeral 111 denotes a paper feed roller which rotates in the direction of an arrow to convey a recording paper. A paper feed drive gear 1 is coaxial with the paper feed roller 111.
12 is fixed. A switching gear 113 is rotatably supported by a gear holder 114. In the paper feed state, the gear holder 114 is urged to the position Y1 by the leaf spring 115, and the switching gear 113 is connected to the paper feed drive gear 112. Switching gear 1
Reference numeral 13 is always connected to a pinion of a paper feed drive motor (not shown). A pump transmission gear 116 transmits power to a suction mechanism (not shown). In such a configuration,
During normal paper feed, the pump transmission gear 116 and the switching gear 1
Since the connection of No. 13 is released, the suction mechanism does not operate, and only the paper feed is performed. Here, when operating the suction mechanism, first, when the carriage on which the recording head (not shown) is mounted operates in the Z direction, a part of the gear holder 114 is pushed by the carriage and moves to the position of Y2. Therefore, the switching gear 113 meshes with the pump transmission gear 116. Further, at this position, the head is covered with a cap (not shown) so that the head can be sucked. When the paper feed roller 111 is rotated in this state, power is transmitted to the suction mechanism. Thus, the suction mechanism is operated by the paper feed drive motor.

[0004]

However, in the apparatus shown in FIG. 9, since the paper feed rollers rotate simultaneously during the suction operation, it becomes difficult to use continuous paper. Also, when printing on cut sheet paper, the paper is fed when the suction operation is attempted, so when performing the suction operation due to clogging of the head during printing, the suction operation is performed after the recording paper is discharged once. Therefore, there is a problem that the recording paper is wasted and that the printing speed is reduced due to the time required for reloading.

In the apparatus shown in FIG. 10, the paper feed train is once cut off when the suction operation is performed. Therefore, when the paper feed is resumed, the paper feed pitch accuracy is reduced due to the eccentricity of the gears or poor meshing. In addition, since the paper feed roller is freely movable during suction, if the paper is pulled to tear off the continuous paper or excessive force is applied to the supply unit, the paper feed roller will rotate and There is a problem that printing is shifted with respect to a perforation or a form frame. The present invention has been made in view of such a problem, and an object of the present invention is to drive a paper feed mechanism and a suction mechanism by a single drive motor without lowering the paper feed accuracy. The present invention is to provide an ink jet recording apparatus capable of performing the above.

[0006]

In order to achieve the above object, a carriage mounted with an ink jet recording head and reciprocated, a paper feeding mechanism for conveying recording paper to a printing area, and suctioning ink from the recording head. Suction mechanism,
A drive motor connected to the paper feed mechanism or the suction mechanism via switching means, wherein the switching means is connected to the drive motor via a train, and a transmission gear of the paper feed drive mechanism is provided. A gear train switching gear that moves between a paper feed drive position that slides the rotating shaft of the transmission gear and engages the thrust surface of the transmission gear to perform paper feed drive, and a paper feed drive position that meshes with the drive wheel train of the suction mechanism. When the suction operation is performed in the middle of the paper feeding and the paper feeding operation is restarted after the suction operation is completed, the rotation speed of the drive motor for the suction operation and the phase of the train The number of rotations is set to an integral multiple of the minimum number of revolutions required to become equal to the phase at the time when the driving is interrupted.

[0007]

After engaging the gear train switching gear and the paper feed transmission gear in a state where the phase of the gear train from the motor to the gear train switching gear when the paper feed drive is interrupted is returned to the exact same phase. In order to restart the paper feed after the suction operation, the state of the gear eccentricity etc. will be the continuation of the previous paper feed state, and the paper feed at the time of printing with high accuracy regardless of the interruption of the paper feed due to the suction operation Becomes possible.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows the relationship between the paper feed train and the pump train in the ink jet recording apparatus of the present invention. The train train switching gear 20 includes a driving motor 51 composed of a pulse motor and a driving force transmitting gear. In the paper feed state, the gear is engaged with the paper feed transmission gear 21 and the engagement with the pump transmission gear 54 is released. In this state, when the motor 51 rotates, the paper feed roller 72 formed of an elastic body via the paper feed transmission gear 21 and the paper feed roller gear 53 again causes the wheel train K to rotate.
, The wheel 70 is driven to feed the paper.

When driving the suction mechanism, the gear train switching gear 20 is disengaged from the paper feed transmission gear 21 and engages with the pump transmission gear 54 to form the pump gear train P. The power of the drive motor 51 is transmitted to 55 to drive a pump (not shown).

More specifically, in FIG. 1, the train wheel switching gear 20 is rotatably and slidably mounted on a support shaft 22 having both ends supported by frames F2 and F3.
The drive gear portion 20d (FIG. 3) formed on one end surface is always connected to the drive force transmission gear 52. The gear train switching gear 20 meshes with the thrust surface of the paper feed transmission gear 21 to drive the paper feed gear train K, and a suction mechanism (shown in the figure) including a pump and the like meshing with the pump transmission gear 54. 2) is moved between two positions of the pump drive position P2 for driving the pump.

The gear train switching gear 20 is constantly urged toward the paper feed transmission gear 21 side (the left side in the figure) by a compression spring 25 provided between the wheel train switching gear 20 and the frame F2 as shown in FIG. The paper feed transmission gear 21 meshes with the thrust surface. The paper feed roller gear 53 is a tractor transmission gear (A)
The tractor transmission gear (C) (D) (E) 6
Power is transmitted to the wheel 70 via 3, 64, 65.

In such a configuration, when the cut sheet is loaded, the cut sheet is inserted from the arrow T, and is sandwiched between the sheet feed roller 72 and the sheet feed driven roller 71 shown in FIG. The paper is fed according to the amount of rotation, and is discharged in the direction of arrow E. In the case of continuous paper, the paper feed holes at both ends thereof are engaged with the pins 70a and conveyed in the direction of arrow F according to the amount of rotation of the wheel 70, and the paper guide plates G1, G
2. The sheet is guided in the direction of arrow E and discharged in the direction of arrow E.

A carriage 10 guided by a rod 12 and a frame F1 is provided in the recording paper transport path so as to be capable of reciprocating movement. An ink jet head H is mounted on the carriage 10, and an ink droplet I is supplied thereto. Printing is performed by discharging the recording paper (not shown).

The above switching mechanism will be further described with reference to FIG. The operating piece 30 has a base 31 and a ring 3
2 and a projecting portion 34 formed in a substantially L-shape. The ring portion 32 is formed smaller than the middle diameter portion 20b of the wheel train switching gear 20, and the wheel train switching gear 20
A hole 33 larger than the small diameter portion 20a is drilled,
It is loosely fitted to the small diameter portion 20a.

The protrusion 34 of the operating piece 30 is
The carriage 10 is in contact with or not in contact with the switching lever 40 provided on the carriage 10 depending on the position of the switching lever 40. The lever 40 is provided at the other end (not shown), and is set by a driving member to one of two positions in the vertical direction in the figure, that is, a position where it comes into contact with the protrusion 34 or a position where it does not come into contact.

Wheel train switching gear 20 and paper feed reduction gear 21
The protrusions 20e and the protrusions 21a having an uneven shape for engagement are formed so as to mesh with each other on the opposing surfaces, and the pitch of the unevenness of the protrusions 21a of the paper feed reduction gear 21 is as follows. The pitch is set to almost twice or more the angular error when the train wheel switching gear 20 stops.

Next, the operation of the above-configured apparatus will be described. <Paper Feeding Operation During Printing> In the paper feeding operation at the time of the normal printing operation, the gear train switching gear 20 is pressed against the thrust surface of the paper feed reduction gear 21 by the compression spring 25 as shown in FIG. The projection 21a and the engagement projection 20e are engaged, and the paper feed reduction gear 2
Power is transmitted to the paper feed gear 53 that meshes with the first gear portion 21b. In this state, the recording paper is conveyed by the paper feed roller 72 by rotating the motor 51 in the paper feed direction.

<Interruption of Printing> When a suction operation command is input from an external operation switch due to clogging of the recording head H or the like, printing is interrupted in a state where a line feed has been performed when printing of one line is completed. The stop position of the paper feed transmission gear 21 at this time is defined as position B.

<Operation of Switching Wheel Train from Paper Feed Drive Position P1 to Pump Drive Position P2> In this state, the wheel train switching gear 20 is rotated to the position C in the direction opposite to the paper feed direction, and then the carriage 10 is driven by the pump. By moving to the position P2 side, the contact portion 42b of the switching lever 40 is brought into contact with the protruding portion 34 of the operation piece 30 and pressed. The movement to the pump driving position P2 side causes the protrusion 2
The side pressure between 0e and 21a is reduced, and the force for pushing the protrusion 34 of the operating piece 30 can be reduced. The movement piece 30 rotates around the base 31 in the direction of the pump drive position P2 by the movement of the carriage 10 to the position p2, so that the train wheel switching gear 20 meshes with the pump transmission gear 54. In this state, the recording head H is capped by cap means (not shown).

<Suction Operation> When the pulse motor 51 is rotated, the driving force of the motor 51 is transmitted to the pump transmission gear 54 and the pump driving gear 55 via the gear train switching gear 20, and the pump (not shown) is driven to drive the recording head. H suction is performed.

<Operation of Switching the Wheel Train from the Pump Drive Position P2 to the Paper Feed Drive Position P1> After the suction operation is completed, only the amount by which the pump is driven is determined.
The phases of the wheel train M and the wheel train switching gear 20 at the time of printing interruption are shifted. The carriage 10 is moved in the direction opposite to the direction at the start of the capping, and the capping means is separated from the recording head H. In this state, the motor 51 is rotated in the direction opposite to the suction of the pump until the phase of the wheel train M and the wheel train switching gear 20 when the paper feeding is started again becomes the same as the phase at the time of printing interruption. Perform phase alignment. Further, the motor 51 is stopped at a position where the angle of the train wheel switching gear 20 has been rotated from the above-described position C by approximately 1/2 pitch of the circumferential direction of the engaging portion 20e in the direction opposite to the paper feeding direction.

In this state, when the carriage 10 is moved to the paper feed drive position P1 to the left in FIG.
The projection of the projection 20e of the train wheel switching gear 20 rides on the projection of the projection 21a of the paper feed transmission gear 21 due to the urging force of. Here, when the gear train switching gear 20 is rotated in the paper feeding direction, the protrusion of the projection 20e of the gear train switching gear 20 fits into the recess of the projection 21a that was engaged when the paper feeding transmission gear 21 was interrupted. Put in. When the paper is further rotated from the position C to the position B at the time of the interruption of the paper feed, the phases of the paper feed trains K and M, the rattle state, the bending state of the shaft, etc. are completely restored to the state at the time of the paper feed interruption. I do. That is, the number of rotations of the drive motor for the suction operation from the time when the paper feeding operation is stopped to the time when the next paper feeding operation is started is necessary for the phase of the wheel train to be equal to the phase when the paper feeding drive is interrupted. It is set to an integral multiple of the minimum rotation speed.

<Restart of Printing> With the above operation, printing can be restarted with almost no paper feed pitch shift caused by inserting the suction operation during printing.

FIGS. 4 to 8 show a second embodiment of the present invention. As shown in FIG. 5, the gear train switching gear 20 has a drive gear portion 20d on one side. On the other side, the small-diameter portion 2 into which the hole 33 of the operating piece 30 is loosely fitted.
0a, a middle diameter portion 20b which comes into contact with the operation piece 30 and receives a sliding force, and a lock claw 26 of a lock lever 26 which will be described later.
b, and a projection 20e that engages with the engagement rib 21a of the paper feed transmission gear 21.

The paper feed transmission gear 21 is a paper feed transmission gear 2
A disk portion 21e provided on one side with a support shaft 21b and a spring hook 21d serving as a rotation fulcrum of a lock lever 26 described later;
The engagement rib 21a described above is formed, and a gear portion 21c that always meshes with the paper feed transmission gear 53 is formed on the other end side. The engagement rib 21a is formed so as to have an idling region (FIG. 8) at an angle A when engaged with the engagement protrusion 20e.

As shown in FIG. 8, the lock lever 26 has a lock claw 26b having a slope 26 formed on the side surface of the gear train switching gear 20 on the inner peripheral surface side, and the inner peripheral surface on the paper feed gear 53 side. The surface of the paper feed gear 21 is provided with a lock tooth 26c, and a rotation fulcrum 26a is rotatably supported on a support shaft 21b of a disk portion 21e of the paper feed gear 21. It is biased in the axial direction.

The lock claw 26b is connected to the gear train switching gear 2
Stop rotation in the paper feed reverse direction with 0. Lock teeth 26
When the gear train switching gear 20 is located at the pump driving position P2, the gear c engages with the lock teeth 24 fixed to the frame F3 to stop rotation in both forward and reverse directions. The lock pitch of the rotation stopper is set to an angle within 1/2 of the idling region A. Further, the slope 26d is raised by the ridge of the small diameter portion 20a of the train wheel switching gear 20 when the train wheel switching gear 20 has moved to a position where the train wheel switching gear 20 is engaged with the paper feed transmission gear 21, and the lock lever 26 is moved in the D direction. To rotate.

Next, the operation of this embodiment will be described. <Paper Feeding Operation During Printing> As shown in FIG. 2, the paper feeding operation at the time of the normal printing operation is such that the train wheel switching gear 20 is pressed against the thrust surface of the paper feed reduction gear 21 by the compression spring 25, and the engagement rib 21a
Is engaged with the engagement protrusion 20e, and the power is transmitted to the paper feed gear 53 meshing with the gear portion 21b of the paper feed reduction gear 21. Therefore, the driving force is transmitted to the paper feed roller 72,
The recording paper is transported. In this state, as shown in FIG. 8, the lock pawl 26b of the lock lever 26 is
0, the lock teeth 26
c is separated from the lock teeth 24 fixed to the frame F3. Even if the gear train switching gear 20 rotates in the reverse direction to the paper feed, the driving force is transmitted to the paper feed transmission gear 21 by the lock lever 26, so that the power is transmitted both in the normal rotation and the reverse rotation of the motor 51. It is possible.

<Interruption of Printing> When a suction operation command is input from an external operation switch due to clogging of the recording head H or the like, printing is interrupted after performing line printing and line feed. The stop position of the paper feed transmission gear 21 at this time is defined as position B.

<Wheel Train Switching Operation from Paper Feed Drive Position P1 to Pump Drive Position P2> In this state, the train wheel switching gear 20 is rotated to the position C in the direction opposite to the paper feed direction, and then the carriage 10 is driven by the pump. By moving to the position P2 side, the contact portion 42b of the switching lever 40 is brought into contact with the protruding portion 34 of the operation piece 30 and pressed. The movement to the pump driving position P2 side causes the protrusion 2
The side pressure between 0e and 21a is reduced, and the force for pushing the protrusion 34 of the operating piece 30 can be reduced. The movement piece 30 rotates around the base 31 in the direction of the pump drive position P2 by the movement of the carriage 10 to the position p2, so that the train wheel switching gear 20 meshes with the pump transmission gear 54. In this state, the recording head H is capped by cap means (not shown).

When the gear train switching gear 20 is at the pump driving position P2
When the lock claw 26b is moved to the position shown in FIG. 8, the lock claw 26b is
6C, the paper feed transmission gear 21 is rotated to a position where it engages with the lock teeth 24 as shown in FIG. That is, when the gear train switching gear 20 is located at the pump driving position P2, the rotatable area of the paper feed transmission gear 21 is shifted to the idling area A.
Is limited to the range of 1/2.

<Suction Operation> When the pulse motor 51 is rotated, the driving force of the motor 51 is transmitted to the pump transmission gear 54 and the pump driving gear 55 via the gear train switching gear 20, and a pump (not shown) is driven to drive the recording head. Is performed.

<Operation of Switching the Wheel Train from Pump Drive Position P2 to Paper Feed Drive Position P1> After the suction operation is completed, the pump is driven by the amount corresponding to the drive of the pump.
The phases of the wheel train M and the wheel train switching gear 20 at the time of printing interruption are shifted. The carriage 10 is moved in the direction opposite to the direction at the start of the capping, and the capping means is separated from the recording head H. In this state, the motor 51 is rotated in the direction opposite to the suction of the pump until the phase of the wheel train M and the wheel train switching gear 20 when the paper feeding is started again becomes the same as the phase at the time of printing interruption. Perform phase alignment. Further, the angle of the train wheel switching gear 20 is shifted from the position C to the engagement portion 20e.
The motor 51 is stopped at a position rotated in a direction opposite to the paper feed direction by approximately ピ ッ チ pitch of the circumferential direction.
In this state, as shown in FIG.
Is stopped at a position rotated from the position B by approximately half the angle of the idling region A in the direction opposite to the paper feeding direction. That is, the number of rotations of the drive motor for the suction operation from the time when the paper feeding operation is stopped to the time when the next paper feeding operation is started is necessary for the phase of the wheel train to be equal to the phase when the paper feeding drive is interrupted. It is set to an integral multiple of the minimum rotation speed.

In this state, when the carriage 10 is moved to the paper feed drive position P1 to the left in FIG.
The protrusion of the projection 20e of the train wheel switching gear 20 is caused by the biasing force of
Fit into the range. In this state, the lock lever 26
Since the lock teeth 26c of the sheet feeding gear 21 are engaged with the lock teeth 24 fixed to the frame F3, the angle of the paper feed transmission gear 21 can change only within a range of 1/2 of the idling area A from the paper feed interruption position C. Even if the recording paper is pulled by an excessive force, the recording paper always engages in the phase before the interruption of the paper feeding.

When the gear train switching gear 20 is further rotated to the position C in the paper feed direction, the lock claw 2 of the lock lever 26 is rotated.
6b is fitted into the lock groove 20c of the gear train switching gear 20 again. When the paper is further rotated from the position C to the position B at the time of the interruption of the paper feed, the phases of the paper feed trains K and M, the rattle state, the bending state of the shaft, etc. are completely restored to the state at the time of the paper feed interruption. I do.

<Restart of Printing> With the above operation, printing can be restarted with almost no deviation of the paper feed pitch due to insertion of the suction operation during printing. Also, even when using continuous paper,
Since the paper feed transmission gear 21 is fixed by the lock lever 26, even if an external force acts on the paper feed transmission gear 20, a pitch shift that accumulates in subsequent paper feed does not occur.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be appropriately modified and implemented within the scope of the present invention.

[0038]

As described above, according to the present invention, the switching means is connected to the drive motor via the train, and slides on the rotating shaft of the transmission gear of the paper feed drive mechanism to engage the transmission gear. And a gear train switching gear that moves between a paper feed drive position that performs paper feed drive and a paper feed drive position that meshes with a drive wheel train of the suction mechanism. A suction operation is performed during the paper feed, and a suction operation is performed. When the paper feed operation is resumed after the end of the operation, the rotation speed of the drive motor for the suction operation is set to the minimum rotation speed required for the phase of the wheel train to become equal to the phase at the time when the paper feed drive was interrupted. Since it is set to an integral multiple, the paper feed after the suction operation can be started in the same phase as when the paper feed operation was interrupted, and the state of the gear eccentricity etc. will be the continuation of the previous paper feed state. Even if the paper feed operation is performed with the It is possible to prevent a decrease in.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an ink jet recording apparatus according to the present invention with respect to a power switching mechanism for switching between a paper feeding mechanism and an ink suction mechanism.

FIG. 2 is a diagram showing the power switching mechanism as viewed from the back of the apparatus.

FIG. 3 is an enlarged perspective view showing a first embodiment of a switching mechanism in the same device.

FIG. 4 is an enlarged perspective view showing a second embodiment of the switching mechanism in the same device.

FIG. 5 is a diagram showing a second embodiment of the switching mechanism as viewed from the back of the apparatus.

FIG. 6 is a side view showing the train wheel switching unit in the suction state of the second embodiment.

FIG. 7 is a diagram showing details of a train wheel switching unit during a meshing operation according to the second embodiment.

FIG. 8 is a diagram showing details of a train wheel switching unit in the paper feed state according to the second embodiment.

FIG. 9 is a diagram illustrating an example of a switching mechanism between a paper feeding mechanism and an ink suction mechanism in a conventional inkjet recording apparatus.

FIG. 10 is a diagram illustrating an example of a switching mechanism between a paper feeding mechanism and an ink suction mechanism in a conventional inkjet recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Carriage 20 Wheel train switching gear 21 Paper feed transmission gear 24 Lock tooth 25 Compression spring 26 Lock lever 30 Working piece 40 Switching lever 51 Drive motor 71 Paper feed driven roller 72 Paper feed roller 53 Paper feed roller gear P1 Paper feed drive position P2 Pump drive position H Inkjet head

Claims (3)

(57) [Claims] A carriage that carries an ink jet recording head and reciprocates; a paper feeding mechanism that conveys recording paper to a printing area; a suction mechanism that suctions ink from the recording head; An ink jet recording apparatus comprising: a drive motor connected to a feed mechanism or a suction mechanism; wherein the switching means is connected to the drive motor via a train, and slides a rotation shaft of a transmission gear of the paper feed drive mechanism. It is composed of a gear train switching gear that moves between a paper feed drive position that engages with the transmission gear to perform paper feed drive, and a paper feed drive position that meshes with the drive gear train of the suction mechanism, and the suction operation is performed during the paper feed. When the paper feed operation is restarted after the suction operation is completed, the rotation speed of the drive motor for the suction operation is set, and the phase of the train wheel interrupts the paper feed drive. An ink jet recording apparatus is set to an integral multiple minimum rotation speed required to equal the phase at the time point. 2. An engagement portion between the gear train switching gear and the paper feed transmission gear is provided with irregularities alternately formed in a circumferential direction of a thrust surface of the gear train switching gear and the paper feed transmission gear. A power transmission relationship is formed by urging the wheel train switching gear against the thrust surface of the paper feed transmission gear, thereby forming a power transmission relationship. 2. The ink jet recording apparatus according to claim 1, wherein the pitch is set to be at least twice the angular error at the stop position of the wheel train switching gear. 3. The engagement between the gear train switching gear and the paper feed transmission gear is formed by an unevenness formed alternately in the circumferential direction of the thrust surface of the gear train switching gear, and the gear train on the paper feed transmission gear. Power transmission is performed by urging the wheel train switching gear against the thrust surface of the paper feed transmission gear, the recess being configured to secure an idling area of a predetermined angle A corresponding to the roughness of the switching gear. When the gear train switching gear is in a meshing position with the suction mechanism drive gear train, a bidirectional rotation of the paper feed transmission gear is performed within a range of not more than 1/2 of the predetermined angle A. 2. The ink jet recording apparatus according to claim 1, further comprising a rotation stopping mechanism for preventing the rotation and for stopping the rotation when in the paper feed driving position.