JP2004345847A - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost recording device with high printing quality by releasing a nip of a reversing carry mechanism during printing with a simple mechanism. <P>SOLUTION: In the recording device, the reversing carry mechanism reversing recording paper is provided with a reversing carry roll 60, a driven roll 76 interlockingly rotated while nipping the recording paper S between the driven roll 76 and the reversing carry roll 60, and a torque limiter 72 mounted to a reversing mechanism rotary shaft 62 penetrating the reversing carry roll 60 and operated when torque not less than prescribed magnitude of torque is applied. A cam 74 is mounted to the torque limiter 72. The reversing carry mechanism is provided with an actuator 82 abutting on the cam 74 and rotating with motion of the cam 74, a rotary shaft 80 to be locked by the actuator 82 and rotated in conjunction with rotation of the actuator 82, and a holding part 78 rotatably holding the driven roll 76 and being rotatably supported by a rotary shaft part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording apparatus capable of recording on both sides by reversing a recording sheet.
[0002]
[Prior art]
2. Description of the Related Art In general, a recording apparatus that performs recording such as printing on both sides of a recording sheet is provided with a reversing transport mechanism that reverses the recording sheet.
[0003]
For example, as shown in FIGS. 13 and 14, in the recording device 180 disclosed in Patent Document 1, after printing on one side of the recording paper S is completed, the recording paper S is reversed by the reverse transport mechanism 186 for recording. The other side of the paper S is directed to the printing portion of the recording head 182, and printing is performed on the other side.
[0004]
By the way, in the conventional recording apparatus 180 having such a reversing transport mechanism 186, the distance between the printing portion of the recording head 182 and the nip portion 190 of the reversing transport mechanism 186 is reduced due to the demand for downsizing of the apparatus. It is shorter than the length. Accordingly, the recording sheet S is nipped by the nip portion 190 of the reversing transport mechanism 186 while being printed, that is, nipped by the reversing transport roll 194 and the driven roll 196 constituting the nip portion 190 and transported. For this reason, there is a problem that the recording paper S is not fed at a desired feeding accuracy during printing, and the printing position is shifted to deteriorate the printing quality.
[0005]
As a mechanism for releasing the nip of the reversing transport mechanism, an example in which a solenoid, a motor, or the like is provided in a recording apparatus to remove unnecessary back tension on recording paper is disclosed in Patent Document 2 (see FIG. 15). It is not preferable because high cost parts are used.
[0006]
[Patent Document 1]
JP 2001-287873 A [Patent Document 2]
JP-A-10-297780
[Problems to be solved by the invention]
An object of the present invention is to provide a recording apparatus which is low in cost and has high printing quality by releasing the nip of the reverse transport mechanism during printing with a simple mechanism in consideration of the above fact.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a reversing conveyance mechanism for reversing the recording paper, and when performing the first recording on one side of the recording paper, double-side recording capable of recording while feeding the recording paper to the reversing conveyance mechanism is possible. In the recording apparatus, the reverse transport mechanism releases the nip of the recording paper when the first recording on the recording paper is being performed, and nips the recording paper when the first recording on the recording paper is completed. It is characterized by having a state switching means.
[0009]
When the first recording is performed on one side while the recording paper is being sent to the reversing transport mechanism, the nip of the reversing transport mechanism is released, so that the accuracy of the feeding speed of the recording paper depends on the printing speed. High accuracy.
[0010]
In the invention described in claim 2, the nip state switching means switches the position of the driven roll by switching a position of the driven roll, a driven roll that nips and follows the recording sheet between the transported roll and the transported roll. And a switching mechanism for switching between a state and a non-nip state.
[0011]
This makes it possible to switch between the nip and the non-nip with a simple mechanism.
[0012]
The invention according to claim 3 is characterized in that the driven roll is a spur.
[0013]
This makes it difficult for ink to be retransferred during the nip.
[0014]
In the invention according to claim 4, the switching mechanism is attached to a rotating shaft portion that penetrates the transport roll, and a torque limiter that rotates a predetermined angle when a torque of a predetermined value or more is applied from the rotating shaft portion. A cam that rotates by a predetermined angle in conjunction with the operation of the torque limiter, an actuator that abuts on the cam and is locked to a rotating shaft, and transmits rotating power to the rotating shaft, and the driven roll. A holding portion rotatably held and rotatably supported by the rotating shaft portion, wherein a nip state and a non-nip state are switched by switching a rotation position of the cam. And
[0015]
Thus, the switching between the nip state and the non-nip state can be performed by controlling the rotation of the transport roll, and the configuration of the switching mechanism can be simplified.
[0016]
Note that the torque limiter may be incorporated in a gear that is attached to the rotating shaft portion and transmits torque, and the cam.
[0017]
The invention according to claim 5 is characterized in that an urging means is provided for urging the torque limiter or the cam in a rotation direction in which a non-nip state is provided.
[0018]
Accordingly, when the magnitude of the torque applied to the torque limiter falls below a predetermined value, the torque limiter can be returned to the position where the nip is released by the urging means.
[0019]
It is also possible to return the cam to the nip releasing position by applying a torque of a predetermined magnitude or more to the torque limiter by rotating the transport roll in the reverse direction without providing the urging means.
[0020]
The invention according to claim 6 is characterized in that the biasing means is a spring.
[0021]
Thereby, the configuration of the urging means can be simplified.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to embodiments. In the second embodiment and the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0023]
[First form]
First, the first embodiment will be described. As shown in FIG. 1, a recording apparatus 10 of the first embodiment conveys a recording head 12 for printing on the upper surface side of recording paper and a recording sheet supplied from a paper feeding device to the recording head 12, and performs printing after the printing is completed. And a transport mechanism 14 for discharging the recording paper to the outside of the recording apparatus 10. The recording paper discharged to the outside of the recording device 10 is either completed printing or sent to a post-processing device.
[0024]
Further, the recording apparatus 10 is provided with a reversing transport mechanism 16 for reversing the recording paper. The transport mechanism 14 is provided at a position immediately downstream of the recording head 12 with a discharge transport line 18 that connects the transport destination of the recording paper sent out from the recording head 12 to the outside of the recording apparatus 10 or the above-described reversal. A switching unit 20 for switching between the transport mechanism 16 and the transport mechanism 16 is provided. The conveyance direction U to the discharge conveyance line 18 is the same as the recording paper entering direction U to the switching unit 20.
[0025]
The transport mechanism 14 is provided with a first main transport roll 24 that nips the recording paper between the driven roll 22 and transports the recording paper to the recording head 12. At a position below the first main transport roll 24, a second main transport roll 30 that nips the recording paper between the driven roll 26 and the driven roll 28 and transports the recording paper to the first main transport roll 24 is provided. I have.
[0026]
The recording paper supplied from the upper paper feeding device 34 and the recording paper sent by the second main transportation roll 30 are transported to the first main transportation roll 24. The recording paper supplied from the lower paper feeding device 36 and the recording paper sent from the reversing transport mechanism 16 are transported to the second main transport roll 30.
[0027]
[Configuration of switching unit]
As illustrated in FIGS. 2 to 5, the switching unit 20 nips the recording paper S between one cylindrical switching unit transport roll 40 and a central portion of the switching unit transport roll 40 and follows the same. There are provided fixed driven rolls 42 and swing driven rolls 44A and 44B which nip the recording paper S and follow the recording paper S between both ends of the switching unit transport roll 40.
[0028]
The switching unit 20 also includes a fixing rotation shaft 46 that presses the fixed driven roll 42 toward the switching unit transport roll 40 and rotatably supports the fixed driven roll 42 and the swing driven rollers 44A and 44B toward the switching unit transport roll 40. And an end rotation shaft 48 for supporting the rotation. Pulleys 50A and 50B are rotatably attached to both ends of the end rotation shaft 48, respectively. The position of the fixed driven roll 42 is set to a position suitable for the approach direction U of the recording paper S to the switching unit 20.
[0029]
Further, the switching unit 20 is provided with support plates 54A and 54B. An arc-shaped opening 56A is formed in the support plate 54A, and the pulley 50A can be moved in the arc direction while being supported at the edge of the opening 56A. Similarly, an arc-shaped opening 56B is formed in the support plate 54B, and the pulley 50B can be moved in the arc direction while being supported at the edge of the opening 56B. In other words, the pulley 50 and the end rotation shaft 48 are guided by the edges of the openings 56A and 56B so that the pulley 50 and the end rotation shaft 48 can move in the G and H directions. That is, the swing driven rolls 44A and 44B are moved in the G and H directions. It is configured to be movable.
[0030]
As shown in FIGS. 2 and 3, when the pulley 50 and the end rotation shaft 48 move in the H direction, the swing driven rolls 44 </ b> A and 44 </ b> B are positioned on the same straight line as the fixed driven roll 42. The recording paper S is conveyed to the discharge conveyance line 18 (see FIG. 1) by the swing driven rolls 44A and 44B.
[0031]
As shown in FIGS. 4 and 5, when the pulley 50 and the end rotation shaft 48 move in the G direction, the position of the swing driven rolls 44A and 44B is moved by the end rotation shaft 48, and the swing driven roll 44A, The recording paper S is transported to the reverse transport mechanism 16 by 44B. Here, the position of the fixed driven roll 42 has not moved. Therefore, even if the transport direction of the recording paper S is changed by the swing driven rolls 44A and 44B, the rear end side of the recording paper S is pressed by the switching unit transport roll 40 by the fixed driven roll 42, so that the recording paper S The posture of the rear end side is prevented from changing, and the rear end side of the recording paper S does not jump.
[0032]
[Configuration of reverse transport mechanism]
As shown in FIGS. 6 to 8, the reversing transport mechanism 16 shown in FIG. 1 includes a plurality of reversing transport rolls 60 arranged in a row and And a reversing mechanism rotating shaft 62 for rotating the reversing transport roll 60. A gear 64 is attached to an end of the reversing mechanism rotating shaft 62, a first small gear 66 meshes with the gear 64, a second small gear 68 meshes with the first small gear 66, and a second small gear 68. The reversing mechanism rotation shaft 62 is rotated by the driving force transmitted to the motor. Note that the rotation direction of the second small gear 68 can be freely switched, and accordingly, the rotation direction of the reversing mechanism rotation shaft 62 can be freely switched.
[0033]
A torque limiter 72 is attached to the reversing mechanism rotating shaft 62 and rotates a predetermined angle in conjunction with the reversing mechanism rotating shaft 62 when a torque of a predetermined magnitude or more is applied from the reversing mechanism rotating shaft 62. Is mounted with a cam 74. The cam 74 is formed of a narrow plate-like member, and is attached to the torque limiter 72 at both ends, and a nip release portion 74T which is the most separated from the reversing mechanism rotation shaft 62 is formed at the center. The nip releasing portion 74T is formed with a smooth and gentle concave portion 74D in which a distal end portion 82S of the actuator 82 described later is locked.
[0034]
The reversing transport mechanism 16 has a plurality of driven rolls 76 arranged in a line and nipping the recording paper between the reversing transport rolls 60, and a holding unit rotatably holding the plurality of driven rolls 76. A part 78 is provided. At one end of the holding portion 78, a through hole 78H parallel to the reversing mechanism rotation shaft 62 is formed, and a rotation shaft 80 that rotatably supports the holding portion 78 passes through the through hole 78H. An actuator 82 is attached to an end of the rotating shaft 80, and a distal end portion 82 </ b> S of the actuator 82 is in contact with the cam 74. 78 rotates around the rotation axis 80. The rotation of the holding unit 78 switches between the nip and the non-nip between the reversing transport roll 60 and the driven roll 76.
[0035]
Springs 84A and 84B are attached to the cam 74, and when the magnitude of the torque applied to the torque limiter 72 is equal to or less than a predetermined value, the spring 84 returns the cam 74 and the torque limiter 72 to the original positions. The nip release portion 74T reaches the uppermost position. The springs 84A and 84B may be attached to the torque limiter 72.
[0036]
In addition, the reversing transport mechanism 16 is provided with a storage unit 88 (see FIG. 1) for temporarily storing the recording paper sent from the switching unit 20 and transported by the reversing transport roll 60. After being stored in the storage section 88, the recording paper is transported toward the second main transport roll 30 by reverse rotation of the reversing transport roll 60.
[0037]
(Action)
Hereinafter, the operation of the recording device 10 will be described.
[0038]
When the recording head 12 performs recording on the front side of the recording paper S (that is, one side on which printing is first performed), as shown in FIGS. 4 and 5, a switching signal from the recording head 12 (see FIG. 1) is switched by a switching unit. 20, a moving force in the G direction is applied to the end rotation shaft 48, and the swing driven rolls 44 </ b> A and 44 </ b> B move in the G direction. That is, the recording sheet nipped by the switching unit transport roll 40 and the swing driven rolls 44A and 44B is transported to the reverse transport mechanism 16.
[0039]
Further, as shown in FIG. 6, the magnitude of the torque applied to the torque limiter 72 is reduced to a predetermined value or less, and the rotational position of the torque limiter 72 is adjusted by the urging force from the springs 84A and 84B to the nip release portion 74T of the cam 74. Is set to reach the uppermost position. Therefore, the distal end portion 82S of the actuator 82 is locked in the concave portion 74D of the nip release portion 74T, and as a result, the rotation of the rotation shaft 80 causes the holding portion 78 to rotate, and the driven roll 76 to rotate the reversing transport roll 60. Away from the nip.
[0040]
Accordingly, the recording paper S is sent to the reverse transport mechanism 16 while the front side of the recording paper S is printed. At this time, since the reversing transport roll 60 and the driven roll 76 are in a non-nip state, the recording paper S can be fed at a desired feeding accuracy during printing by the switching unit transport roll 40 and the fixed driven roll 42. It can be fed, and there is no shift in the printing position. Further, even if the transport direction of the leading end side of the recording paper S is changed by the swing driven rolls 44A and 44B, the rear end side of the recording paper S is pressed by the switching unit transport roll 40 by the fixed driven roll 42. Thus, the rear end of the recording sheet S does not jump, and the posture of the rear end of the recording sheet S is prevented from changing. Therefore, it is possible to prevent image disorder and paper damage.
[0041]
When printing on the front side of the recording paper is completed, a signal is transmitted from the recording head 12, the rotational force of the second small gear 68 is increased by a driving mechanism (not shown) of the reversing transport mechanism 16, and the torque is limited to a predetermined value by the torque limiter 72. The torque having the above magnitude is applied. Accordingly, as shown in FIG. 7, the torque limiter 72 rotates by a predetermined angle in the P direction and stops. For this reason, the actuator 82 rotates and the front end portion 82S of the actuator 82 approaches the reversing mechanism rotation shaft 62, and the recording paper S is nipped and transported by the reversing transport roll 60 and the driven roll 76, and is transported to the storage section 88 ( (See FIG. 1).
[0042]
Further, the rotation direction of the second small gear 68 is reversed by the driving device, and a torque of a predetermined magnitude or more is applied to the torque limiter 72. Therefore, the torque limiter 72 rotates by a predetermined angle in the Q direction and stops. For this reason, the actuator 82 changes to the state shown in FIG. 8 via the state shown in FIG. 6, and the recording paper S is nipped by the reversing transport roll 60 and the driven roll 76 and is carried out of the storage section 88, It is transported to the second main transport roll 30 (see FIG. 1).
[0043]
Further, the recording paper S is conveyed by the first main conveyance roll 24 and sent to the recording head 12, and the recording head 12 prints on the back side of the recording paper S (that is, on one side for the second printing). At this time, a switching signal from the recording head 12 is transmitted to the switching unit 20, and a moving force in the H direction is applied to the end rotation shaft 48, so that the swing driven rollers 44A and 44B move in the H direction (FIG. 2, see FIG. 3). That is, the recording paper S nipped by the switching unit transport rolls 40 and the swing driven rolls 44A and 44B is sent to the discharge transport line 18 that is transported out of the recording apparatus 10.
[0044]
Therefore, the recording paper S is sent to the discharge conveyance line 18 while the back side of the recording paper S is printed.
[0045]
As described above, according to the present embodiment, when recording is performed on the front side (that is, one side on which printing is first performed) by the recording head 12, the recording sheet S is printed while being sent to the reverse transport mechanism 16, At this time, the reversing transport roll 60 and the driven roll 76 of the reversing transport mechanism 16 are in a non-nip state. Therefore, the recording sheet S can be fed at a desired feed accuracy during printing by the switching unit transport roll 40 and the fixed follower roll 42 of the switching unit 20, so that the printing position may be shifted by the reverse transport mechanism 16. There is no difference in image quality between the front side and the back side. Further, since the position of the fixed follower roll 42 of the switching unit 20 does not move, the posture of the rear end side of the recording sheet S is prevented from changing. Therefore, it is possible to prevent image disorder and paper damage. Further, the mechanism of the reversing transport mechanism 16 is simple.
[0046]
[Second embodiment]
Next, a recording apparatus according to a second embodiment will be described. As shown in FIGS. 9 to 11, in the recording apparatus of the second embodiment, a single spring 94 attached to the torque limiter 72 and biasing the torque limiter 72 is provided.
[0047]
The spring 94 is attached so that the urging force exerted on the torque limiter 72 becomes zero in the non-nip state (see FIG. 9), and is pulled when the recording paper S is transported to the storage section (see FIG. 10). When the energy is sending the recording paper out of the storage section (see FIG. 11), the compression energy is stored in the spring 94, respectively. Therefore, when the magnitude of the torque applied to the torque limiter 72 becomes equal to or less than a predetermined value, the return of the torque limiter 72 to a position where the reversing transport roll 60 and the driven roll 76 are in a non-nip state is performed by one spring 94. Can be realized.
[0048]
[Third embodiment]
Next, a third embodiment will be described. As shown in FIG. 12, in the recording apparatus 100 of the third embodiment, a reverse transport mechanism 106 is provided instead of the reverse transport mechanism 16 (see FIG. 1) described in the first embodiment, and the recording apparatus 100 described in the first embodiment is used. A switching unit 110 is provided instead of the switching unit 20 (see FIG. 1).
[0049]
In the reversing transport mechanism 106, the driven roller 108 is spur (star wheel) compared to the reversing transport mechanism 16, and in the switching unit 110, the fixed driven roll 112 and the oscillating driven roll 114 are compared with the switching unit 20. Has been spurred.
[0050]
Thereby, at the time of the nip, the recording paper can be transported without causing retransfer of the ink.
[0051]
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.
[0052]
【The invention's effect】
Since the present invention is configured as described above, the nip of the reversing transport mechanism is released by a simple mechanism during printing, so that a recording apparatus with low cost and high printing quality can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a recording apparatus according to a first embodiment.
FIG. 2 is a perspective view illustrating a configuration of a switching unit provided in the recording apparatus according to the first embodiment.
FIG. 3 is a side view illustrating a configuration of a switching unit provided in the recording apparatus according to the first embodiment.
FIG. 4 is a perspective view illustrating a configuration of a switching unit provided in the recording apparatus according to the first embodiment.
FIG. 5 is a side view illustrating a configuration of a switching unit provided in the recording apparatus according to the first embodiment.
FIG. 6 is a partial perspective view illustrating a reverse conveyance mechanism of the recording apparatus according to the first embodiment.
FIG. 7 is a partial perspective view illustrating a reverse conveyance mechanism of the recording apparatus according to the first embodiment.
FIG. 8 is a partial perspective view illustrating a reverse conveyance mechanism of the recording apparatus according to the first embodiment.
FIG. 9 is a partial perspective view illustrating a reverse conveyance mechanism of a recording apparatus according to a second embodiment.
FIG. 10 is a partial perspective view illustrating a reverse conveyance mechanism of a recording apparatus according to a second embodiment.
FIG. 11 is a partial perspective view illustrating a reverse conveyance mechanism of a recording apparatus according to a second embodiment.
FIG. 12 is a schematic diagram illustrating a configuration of a recording apparatus according to a third embodiment.
FIG. 13 is a side sectional view showing an example of a conventional recording apparatus.
FIG. 14 is a side cross-sectional view illustrating an example of a reverse transport mechanism of a conventional recording apparatus.
FIG. 15 is a side cross-sectional view illustrating an example of a reverse transport mechanism of a conventional recording apparatus.
[Explanation of symbols]
Reference Signs List 10 recording device 16 reversing transport mechanism 60 reversing transport roll 62 reversing mechanism rotation shaft (rotation shaft part)
72 Torque limiter 74 Cam 76 Follower roll 78 Holder 80 Rotating shaft (rotating shaft)
82 Actuator 84A, B Spring 94 Spring 100 Recording device 106 Reverse transport mechanism 108 Follower roll 180 Recording device 186 Reverse transport mechanism 194 Reverse transport roll (transport roll)
196 Follower roll

Claims (6)

A recording apparatus that has a reversing conveyance mechanism for reversing the recording paper, and a two-sided recording capable of performing recording while sending the recording paper to the reversing conveyance mechanism when performing the first recording on one side of the recording paper,
The reverse transport mechanism has a nip state switching unit that releases the nip of the recording sheet when the first recording on the recording sheet is performed, and nips the recording sheet when the first recording on the recording sheet is completed. A recording device characterized by the above-mentioned. The nip state switching means, a transport roll,
A driven roll that nips the recording paper between the transport roll and the paper roll,
2. The recording apparatus according to claim 1, further comprising: a switching mechanism configured to switch between a nip state and a non-nip state by switching a position of the driven roll. The recording apparatus according to claim 2, wherein the driven roll is a spur. The switching mechanism is attached to a rotating shaft that penetrates the transport roll, a torque limiter that rotates a predetermined angle when a torque of a predetermined magnitude or more is applied from the rotating shaft,
A cam that rotates a predetermined angle in conjunction with the operation of the torque limiter,
An actuator that abuts on the cam and is locked to the rotating shaft, and transmits a rotating power to the rotating shaft;
A holding portion rotatably holding the driven roll and rotatably supported by the rotation shaft portion, and switching the rotation position of the cam to switch between a nip state and a non-nip state. The recording apparatus according to claim 2, wherein the recording apparatus is used. 5. The recording apparatus according to claim 4, further comprising: a biasing unit configured to bias the torque limiter or the cam in a rotation direction in which a non-nip state is provided. The recording apparatus according to claim 5, wherein the urging means is a spring.

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