JP3812643B2 - Conveyor driven roller mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a conveyance drive roller that conveys a recording material in the sub-scanning direction and a conveyance drive roller that is urged by the conveyance drive roller, and presses the recording material against the conveyance drive roller while being in contact with the recording material. The present invention relates to a conveyance driven roller mounting apparatus and a recording apparatus such as an ink jet printer in a recording apparatus including a conveyance driven roller that is driven to rotate.
[0002]
[Prior art]
A transport driven roller mounting device comprising a transport driven roller and a holder having a biasing means such as a spring is rotatably supported by the transport of the recording material while biasing the transport driven roller to the transport drive roller. is doing. FIG. 10 is a perspective view showing an example of a transport driven roller mounting device that is generally known in the prior art.
[0003]
Two transport driven rollers 54 are rotatably supported on the holder 1 by a metal shaft 2 individually. The holder 1 has an urging means comprising a torsion coil spring 4, and one end side thereof is located between the two conveyance driven rollers 54 as shown in the figure. Further, the other end side of the torsion coil spring 4 is in contact with the main body frame 3 of the recording apparatus as shown in the figure, and the holder 1 attached to the main body frame 3 by the spring force of the torsion coil spring 4 is a conveyance drive roller. 53 will be urged.
[0004]
The recording material P is pressed against the conveyance driving roller 53 by the conveyance driven roller 54 while being sandwiched between the conveyance driving roller 53 and the conveyance driven roller 54. Then, the conveyance driving roller 53 is conveyed in the sub-scanning direction Y by the rotation of the conveyance driving roller 53, and the conveyance driven roller 54 is rotated following the conveyance of the recording material P.
[0005]
[Problems to be solved by the invention]
In the conventional holder 1 shown above, the point of application of the urging force by the torsion coil spring 4 is located between the two transport driven rollers 54 in the vicinity of the center of the holder 1. Therefore, the holder 1 having a horizontally long shape is pressed against the recording material P in a state where the vicinity of the center portion is bent downward by the biasing force.
[0006]
FIG. 11 is a front view exaggeratingly showing a state in which the holder 1 is bent and urged. Since the central portion of the holder 1 is biased downward, the left side of the transport driven roller 54a is lifted, and only the vicinity of the right end is in contact with the recording material P. Further, the conveyance driven roller 54b is lifted on the right side, and only the vicinity of the left end is in contact with the recording material P.
[0007]
Accordingly, the conveyance driven roller 54 a and the conveyance driven roller 54 b are in contact with the recording material P in an inclined state due to the deflection of the holder 1, and thus are not in surface contact. For this reason, the transport driven roller 54a and the transport driven roller 54b are not evenly loaded, so that there is a possibility that the recording material P may be partially touched with the recording material P and damaged.
[0008]
The present invention has been made in view of such a situation, and the problem is that the recording material is moved by the conveying driven roller mounting device in which the conveying driven roller rotates evenly in surface contact with the recording material. An object of the present invention is to enable conveyance of a recording material with little risk of damage.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present application is urged by a conveyance driving roller that conveys a recording material in the sub-scanning direction, and conveys the recording material while contacting the recording material. A conveyance driven roller that rotates following the conveyance of the recording material, a holder that rotatably supports the conveyance driven roller, and urging the holder against the conveyance drive roller, A transport driven roller mounting device having biasing means for biasing the transport driven roller to the transport drive roller, wherein the holder supports both ends of the single transport driven roller, and the transport of the holder The conveyance so as to prevent the holder from being bent while equally branching and transmitting the urging force by the urging means acting near the center upstream of the driven roller in the sub-scanning direction upstream to both ends of the conveyance driven roller. Obedience Upper surface of the holder so as to straddle the point of action of the biasing force in the rotational axis direction and parallel ribs which constitutes a series of ridges and protrusions to substantially perpendicular to the long and the upper surface of the holder by the biasing means of the rollers It is formed in the approximate center part of this, The conveyance driven roller attachment apparatus characterized by the above-mentioned.
[0010]
Thus, the holder is configured to pivotally support both ends of one transport driven roller, and the point where the biasing force by the biasing means acts on the holder is located upstream of the transport driven roller in the sub-scanning direction. Therefore, the urging force with respect to the holder acts on both ends of the transport driven roller. In addition, since the holder has a rib having a shape for equally branching and transmitting the urging force to both ends of the transport driven roller, the recording material can be recorded without inclining the transport driven roller toward either end. It is possible to make surface contact evenly. Further, since the rib has a shape that prevents the holder from being bent, the central portion of the conveyance driven roller is strongly pressed against the recording material when the vicinity of the central portion where the urging force of the holder acts is bent. Can be prevented.
[0011]
Thus, according to the conveyance driven roller mounting device according to the first aspect of the present invention, the urging force is equally applied to both ends of the conveyance driven roller to bring the conveyance driven roller into surface contact with the recording material. Therefore, the recording material can be transported with little risk of damaging the recording material.
[0012]
The invention according to claim 2 of the present application is that, in claim 1, the transport driven roller is configured by a roller portion and shafts provided at both ends of the roller portion, and the roller portion is tapered in the vicinity of both ends. It is the conveyance driven roller attachment apparatus characterized by having comprised the shape which has the taper which carried out.
[0013]
A conveyance driven roller composed of a roller portion in surface contact with the recording material and shafts provided at both ends of the roller portion is supported by the holder on the shaft, and the recording material is applied by an urging force acting on the shaft. Therefore, both ends of the transport driven roller slightly bend downward. As a result, the vicinity of both end portions of the roller portion is strongly pressed against the recording material. Therefore, depending on the shape of the end portion of the roller portion, there is a possibility that the recording material may have marks on both ends of the roller portion. is there.
[0014]
In the transport driven roller according to claim 2 of the present invention, the vicinity of both end portions of the roller portion in surface contact with the recording material has a tapered shape, so that the transport driven roller acts on both end portions of the transport driven roller. Even if both ends of the transport driven roller are slightly bent downward by the urging force, the vicinity of both ends of the roller portion is not strongly pressed against the recording material.
[0015]
Thereby, according to the conveyance driven roller attachment apparatus which concerns on invention of Claim 2 of this application, in addition to the effect by the invention of Claim 1 of this application, both ends of a conveyance driven roller are bent below slightly. Thus, there is an effect that the recording material is less likely to have traces at both ends of the roller portion.
[0016]
The invention according to claim 3 of the present application is characterized in that, in claim 2, the conveyance driven roller is characterized in that the roller portion and the shaft are integrally formed of a resin member by injection molding. This is a driven roller mounting device.
[0017]
According to the transport driven roller mounting device according to the invention described in claim 3 of the present application, in addition to the function and effect of the invention described in claim 2 of the present application, the roller portion and the shaft of the transport driven roller are integrally formed. Therefore, it is possible to provide a transport driven roller with less rotation of the roller portion and stable rotation. Moreover, since the conveyance driven roller is an integral resin member formed by injection molding, there is an effect that the manufacturing cost of the conveyance driven roller mounting device is reduced.
[0018]
The invention according to claim 4 of the present application is any one of claims 1 to 3, wherein the biasing means is a torsion coil spring, and an axial center line of the torsion coil spring is connected to a rotation shaft of the conveyance driven roller. It is a conveyance driven roller mounting apparatus characterized by being parallel.
[0019]
Thus, the biasing means is a torsion coil spring, and the axial center line of the torsion coil spring is parallel to the rotation axis of the transport driven roller, so that the biasing force due to the spring force of the torsion coil spring is transported to the holder. It acts in the downward direction perpendicular to the rotational axis of the driven roller.
[0020]
Thereby, according to the conveyance driven roller mounting apparatus which concerns on invention of Claim 4 of this application, in addition to the effect by the invention of any one of Claims 1-3 of this application, the spring force of a torsion coil spring Since the urging force acts on the holder in the downward direction perpendicular to the rotation axis of the transport driven roller, there is little possibility that the urging force acts obliquely on the holder. Therefore, an effect is obtained that the urging force acting on the contact surface between the conveyance driven roller and the recording material always acts uniformly and stably.
[0021]
The invention according to claim 5 of the present application is a recording apparatus including the conveyance driven roller mounting device according to any one of claims 1 to 4.
According to the recording apparatus relating to the invention described in claim 5 of the present application, the function and effect of the invention described in any one of claims 1 to 4 described above can be obtained in the recording apparatus.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view showing an embodiment of an ink jet recording apparatus according to the present invention, and FIG. 2 is a side view thereof.
[0023]
The recording apparatus 50 is provided with a carriage 61 that is supported by a carriage guide shaft 51 and moves in the main scanning direction X as recording means for performing recording on the recording material P. A recording head 62 that performs recording by discharging ink onto the recording material P is mounted on the carriage 61. A platen 52 that defines the gap between the head surface of the recording head 62 and the recording material P is provided opposite to the recording head 62. The recording head 62 ejects ink onto the recording material P while the carriage 61 is conveyed in the main scanning direction X and the recording material P is intermittently conveyed between the carriage 61 and the platen 52 in the sub-scanning direction Y. As a result, recording is performed on the recording material P.
[0024]
The paper feed tray 58 is configured to feed a recording material P such as plain paper or photo paper, for example, and is provided with an ASF (auto sheet feeder) for automatically feeding the recording material P. It has been. The ASF is an automatic paper feed mechanism having two paper feed rollers 57 provided on a paper feed tray and a separation pad (not shown). The sheet feeding roller 57 is rotationally controlled by a rotational driving force such as a stepping motor, and has a D-shaped outer shape when viewed from the side. One of the two paper feed rollers 57 is disposed on one side of the paper feed tray 58, the other paper feed roller 57 is attached to a recording paper guide 59, and the recording paper guide 59 is a recording target. The paper feed tray 58 is provided so as to be slidable in the direction of the arrow indicated by the symbol A according to the width of the material P. When a plurality of recording materials P placed on the sheet feeding tray 58 are fed by the rotational driving force of the sheet feeding roller 57 and the frictional resistance of the separation pad, the plurality of recording materials P are supplied at a time. The paper is automatically fed accurately one by one without being fed.
[0025]
Then, the recording material P automatically fed by the ASF is downstream in the sub-scanning direction Y on the recording execution area side by the recording paper conveying means disposed downstream of the paper feeding roller 57 in the sub-scanning direction Y. The paper is intermittently conveyed toward the side by a predetermined paper feed amount.
[0026]
As recording paper conveying means for intermittently conveying the recording material P in the sub-scanning direction Y, a conveyance driving roller 53 and a conveyance driven roller 54 are provided. The conveyance driving roller 53 is rotationally controlled by a rotational driving force such as a stepping motor, and the recording material P is conveyed in the sub-scanning direction Y by the rotation of the conveyance driving roller 53. A plurality of transport driven rollers 54 are individually urged by the transport drive roller 53, and when the recording material P is transported by the rotation of the transport driving roller 53, the transport driven roller 54 is in contact with the recording material P while being in contact therewith. The recording material P rotates following the conveyance of the recording material P.
[0027]
Further, a paper detector 63 according to a known technique in the prior art is disposed between the paper feed roller 57 and the conveyance drive roller 53. The paper detector 63 is provided with a lever that is pivotally supported in a state that it is given a self-return behavior to a standing posture and protrudes into the conveyance path of the recording material P so that it can be rotated only in the recording paper conveyance direction. The lever is rotated by pushing the tip of the lever against the recording material P, and the recording material P is thereby detected. The paper detector 63 detects the start end position and the end position of the recording material P fed from the paper feed roller 57, determines a recording area according to the detected position, and executes recording.
[0028]
On the other hand, as means for discharging the recorded recording material P, a paper discharge driving roller 55 and a paper discharge driven roller 56 are provided. The paper discharge driving roller 55 is rotationally controlled by a rotational driving force such as a stepping motor, and the recording material P is discharged in the sub-scanning direction Y by the rotation of the paper discharge driving roller 55. The paper discharge driven roller 56 is a toothed roller having a plurality of teeth around it and sharply sharpened so that the tip of each tooth makes point contact with the recording surface of the recording material P. Each of the plurality of paper discharge driven rollers 56 is individually urged by the paper discharge driving roller 55, and is in contact with the recording material P when the recording material P is discharged by the rotation of the paper discharge driving roller 55. The recording material P rotates following the discharge of the recording material P.
[0029]
FIG. 3 is a plan view showing an embodiment of the transport driven roller mounting device according to the present invention.
The holder 1 is made of a resin member such as plastic by injection molding, and rotatably supports both ends of the transport driven roller 54 at the bearing portion 11. The holder 1 is attached to the main body frame 3 of the ink jet recording apparatus 50 while being urged by the torsion coil spring 4 to the conveyance drive roller 53. A cylindrical convex portion 13 and a support portion 14 are formed on the holder 1. The holder 1 is positioned by fitting the two convex portions 13 into the attachment holes 31 provided in the main body frame 3 from the lower side of the main body frame 3. As shown in FIG. 3, the holder 1 is attached to the main body frame 3 in a swingable manner so as to sandwich the main body frame 3 from the upper side and the lower side by the two convex portions 13 and the two support portions 14. .
[0030]
FIG. 4 is a perspective view showing an embodiment of the transport driven roller mounting device according to the present invention. FIG. 5 is a plan view of the holder 1 in the embodiment of the transport driven roller mounting device according to the present invention as seen from the back side.
[0031]
As shown in the drawing, the torsion coil spring 4 has one end located in the groove 17 and is positioned and attached to the spring retainer 16. Then, the groove 17 with which one end side of the torsion coil spring 4 is in contact serves as an application point of the urging force by the spring force of the torsion coil spring 4. Further, the other end side of the torsion coil spring 4 has an L shape as shown in the figure, is positioned by the spring guide 15, and abuts on the main body frame 3 of the ink jet recording apparatus 50. The holder 1 attached to the main body frame 3 is biased by the conveyance drive roller 53 by the spring force of the torsion coil spring 4.
[0032]
The holder 1 has increased rigidity against deflection by the front surface rib 12 and the rear surface rib 18. Further, the front rib 12 and the rear rib 18 play a role of equally transmitting the urging force acting on the groove 17 to the left and right bearing portions 11. And the urging | biasing force by the torsion coil spring 4 acts equally on the both ends of the conveyance driven roller 54 by which the both ends are pivotally supported by the bearing part 11. FIG.
[0033]
FIG. 6 shows the transport driven roller 54 in the embodiment of the transport driven roller mounting device according to the present invention. FIG. 6A is a front view of the conveyance driven roller 54, and FIG. 6B is a side view of the conveyance driven roller 54.
[0034]
The conveyance driven roller 54 includes a roller portion 21 and shafts 22 formed at both ends of the roller portion 21. The roller portion 21 is formed by a straight portion 23 having a cylindrical body shape and a tapered portion 24 having a taper shape that tapers toward the end portion in the vicinity of both end portions of the roller portion 21. The transport driven roller 54 is a resin member formed by injection molding, and the roller portion 21 and the shaft 22 are integrally formed.
[0035]
FIG. 7 is a front view showing an embodiment of the transport driven roller mounting device according to the present invention. The urging force of the torsion coil spring 4 indicated by the symbol N is equally transmitted to the left and right by the front rib 12 and the rear rib 18 (FIG. 5) provided on the holder 1 as described above. The urging forces N1 and N2 transmitted in a branching manner act on both ends of the transport driven roller 54 with the same magnitude of force.
[0036]
Although the conveyance driven roller 54 is formed of a resin member having a relatively high hardness, both ends of the conveyance driven roller 54 are bent downward by an urging force acting on both ends of the conveyance driven roller 54. As a result, both end portions of the roller portion 21 are strongly pressed on the surface where the transport driven roller 54 comes into surface contact with the recording material P, so that both end portions of the roller portion 21 are pressed against the recording material P. There is a risk of leaving marks. Therefore, the roller portion 21 is provided with a taper portion 24 having an extremely small taper so that the contact surface of the roller portion 21 becomes flat.
[0037]
FIG. 8 is a front view showing the vicinity of the end in a state where the conveyance driven roller 54 is bent in the embodiment of the conveyance driven roller mounting device according to the present invention.
When the urging force of the torsion coil spring 4 acts on the holder 1 indicated by the wavy line, the holder 1 moves while being pressed against the position of the holder 1 indicated by the solid line. As a result, the urging force N1 acts on the bearing portion 22 of the conveyance driven roller 54 indicated by the broken line. Then, the roller portion 21 bends in the vicinity of both end portions thereof, and the taper portion 24 indicated by a wavy line bends like the taper portion 24 indicated by a solid line and comes into contact with the recording material P.
[0038]
Thus, by providing the tapered portion 24 on the roller portion 21 of the conveyance driven roller 54, the contact surface of the roller portion 21 becomes flat in a state where the conveyance driven roller 54 is bent. Can be prevented from being strongly pressed.
[0039]
FIG. 9 is a front view showing the vicinity of the tapered portion 24 of the conveyance driven roller 54 in the embodiment of the conveyance driven roller mounting device according to the present invention.
In the present embodiment, the width of the taper portion 24 is 5.5 mm, and the taper width of the taper portion 24 indicated by symbol b is about 0.05 mm. Note that the portion indicated by reference sign c is a step required for removing the mold at the time of injection molding, and is about 0.03 mm in this embodiment. Since the conveyance driven roller 54 is formed of a resin member having a relatively high hardness, the amount of deflection thereof is extremely small, and the taper of the taper portion 24 is extremely small.
[0040]
In this way, the holder 1 is configured to pivotally support both ends of one transport driven roller 54, and the biasing force of the twist coil spring 4 acts on the holder 1 in the sub-scanning direction Y from the transport driven roller 54. Therefore, the urging force against the holder 1 acts on both end portions of the transport driven roller 54.
[0041]
The holder 1 has the front surface rib 12 and the rear surface rib 18 that form a shape for equally branching and transmitting the urging force to both ends of the transport driven roller 54. It becomes possible to make it contact.
[0042]
Furthermore, since the front rib 12 and the rear rib 18 have a shape that prevents the holder 1 from being bent, the vicinity of the central portion where the biasing force of the holder 1 acts is bent, so that the central portion of the transport driven roller 54 is Can be prevented from being strongly pressed against the recording material P.
[0043]
Further, since the conveyance driven roller 54 has a shape in which the vicinity of both ends of the roller portion in surface contact with the recording material P has a taper tapered toward the end portion, the conveyance driven roller 54 is formed at both ends of the conveyance driven roller 54. Even if both ends of the transport driven roller 54 bend downward slightly due to the applied urging force, the vicinity of both ends of the roller portion 21 is not strongly pressed against the recording material P.
[0044]
As another embodiment, one in which the tapered portion 24 is not provided in the roller portion 21 of the conveyance driven roller 54 can be cited. When the conveyance driven roller 54 can be urged to the recording material P without being bent at all due to the length, thickness, hardness and the like of the conveyance driven roller 54, it is necessary to provide the tapered portion 24 on the roller portion 21. In this case, the present invention can be implemented.
[0045]
It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.
[0046]
【The invention's effect】
According to the present invention, it is possible to convey the recording material with little risk of damaging the recording material by the conveying driven roller mounting device in which the conveyance driven roller rotates in surface contact with the recording material evenly.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing an embodiment of an ink jet recording apparatus according to the present invention.
FIG. 2 is a schematic side view showing an embodiment of an ink jet recording apparatus according to the present invention.
FIG. 3 is a plan view showing an embodiment of a transport driven roller mounting device according to the present invention.
FIG. 4 is a perspective view showing an embodiment of a transport driven roller mounting device according to the present invention.
FIG. 5 is a plan view of the holder in the embodiment of the transport driven roller mounting device according to the present invention as viewed from the back side.
FIG. 6 shows a transport driven roller in an embodiment of a transport driven roller mounting device according to the present invention. FIG. 6A is a front view of the conveyance driven roller, and FIG. 6B is a side view of the conveyance driven roller.
FIG. 7 is a front view showing an embodiment of a transport driven roller mounting device according to the present invention.
FIG. 8 is a front view showing the vicinity of the end in a state in which the conveyance driven roller is bent in the embodiment of the conveyance driven roller mounting device according to the present invention;
FIG. 9 is a front view showing the vicinity of the tapered portion of the conveyance driven roller in the embodiment of the conveyance driven roller mounting device according to the present invention.
FIG. 10 is a perspective view showing an example of a conveyance driven roller mounting device that is generally known in the prior art.
FIG. 11 is a front view exaggeratingly showing a state in which the holder of the transport driven roller mounting device according to the prior art is bent and urged.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holder 3 Main body frame 4 Torsion coil spring 11 Bearing part 12 Surface rib 13 Convex part 14 Support part 15 Spring guide 16 Spring press 17 Groove 18 Back surface rib 21 Roller part 22 Shaft 23 Straight part 24 Taper part 50 Recording apparatus 51 Carriage guide shaft 52 Platen 53 Conveyance Drive Roller 54 Conveyance Driven Roller 55 Discharge Driven Roller 56 Discharged Driven Roller 57 Paper Feed Roller 58 Paper Feed Tray 59 Recording Paper Guide 61 Carriage 62 Recording Head 63 Paper Detector P Recording Material

Claims (5)

The conveyance drive roller that is urged by the conveyance drive roller that conveys the recording material in the sub-scanning direction and presses the recording material against the conveyance drive roller while being in contact with the recording material, and rotates following the conveyance of the recording material. A driven roller; a holder that rotatably supports the transport driven roller; and biasing means that biases the transport driven roller to the transport drive roller by biasing the holder to the transport drive roller. A transport driven roller mounting device comprising:
The holder pivotally supports both ends of the one transport driven roller, and a biasing force by the biasing means acting near the center of the holder on the upstream side in the sub-scanning direction is applied to the transport driven roller. A series of protrusions that are long in a direction parallel to the rotation axis direction of the transport driven roller and protrude in a substantially vertical direction on the upper surface of the holder so as to prevent the holder from being bent while being equally transmitted to both ends of the holder. 2. A transport driven roller mounting device according to claim 1, wherein a rib constituting the strip is formed at a substantially central portion of the upper surface of the holder so as to straddle the point of application of the biasing force by the biasing means .   In Claim 1, the said conveyance follower roller is comprised by the roller part and the shaft provided in the both ends of this roller part, and the said roller part has comprised the shape which has the taper which the both ends vicinity taper. A conveying driven roller mounting device characterized by that.   3. The transport driven roller mounting device according to claim 2, wherein the transport driven roller is configured such that the roller portion and the shaft are integrally formed of a resin member by injection molding.   The conveyance according to any one of claims 1 to 3, wherein the biasing means is a torsion coil spring, and an axial center line of the torsion coil spring is parallel to a rotation axis of the conveyance driven roller. Driven roller mounting device.   A recording apparatus comprising the conveyance driven roller mounting device according to claim 1.

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