JP2004083165A - Supporting device for toothed roller and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting device for toothed rollers which can make engagement in an equal pressure contact force to the printing surface without resorting to a costly molding method such as outsert molding. <P>SOLUTION: The supporting device for the toothed rollers is equipped with a rod spring 29 with two ends supported by shaft holding parts, two toothed rollers 25 in a flat plate shape furnished with teeth at the whole periphery, and bearing means 39 and 43 to bear the toothed rollers from the outer and inner surfaces of each toothed roller. At the periphery of the rotational center, each roller is furnished with a bearing part 35 in cylindrical shape extending from the confronting surface side of the roller in the direction parallel with the axis of the rod spring and making slide contact with the peripheral surface of the rod spring, and the two rollers are located in the position where the rod spring deflects when their tooth parts are in pressure contact with the peripheral surface of a driving roller or the printing surface. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a toothed roller serving as a discharge driven roller that is used to discharge a printed material immediately after printing and faces a discharge driving roller, and a recording apparatus such as an ink jet printer including the same.
[0002]
[Prior art]
2. Description of the Related Art In an ink jet printer, which is one of recording apparatuses, a discharge roller is used to discharge a printed matter immediately after printing. The paper discharge roller has a plurality of teeth around a paper discharge drive roller positioned below the paper discharge path and a print paper discharge path opposed to the paper discharge drive roller. And a toothed roller that is sharply pointed so that the tip of the roller contacts the printing surface. This toothed roller is employed immediately after the ink is discharged onto the paper because the ink on the paper has not been dried yet.
[0003]
FIG. 7 shows a conventional toothed roller support mechanism for discharging paper. As shown in FIG. 7, in a conventional toothed roller support mechanism 101, an outsert molded toothed roller 107 is rotatably provided around a bar spring 105 whose both ends are supported by a shaft holding portion 103. Things. The outsert-molded toothed roller 107 has a roller base 109 formed in a ring shape, and a tooth 111 to be engaged with the printing surface is formed around the roller base 109. Further, two toothed rollers 107 are arranged in parallel, and the flat opposing surfaces 113 of the roller base 109 of each toothed roller 107 are in contact with each other, and each outer surface 115 of the roller base 109 of each toothed roller 107 is contacted. The restricting member 117 abuts on this to restrict swinging of the toothed roller 107 during rotation.
[0004]
[Problems to be solved by the invention]
However, the cost of the conventional toothed roller support mechanism 101 tends to be high because the toothed roller 107 is outsert molded. By the way, in place of such an outsert-formed toothed roller 107, a flat plate-shaped toothed roller formed by punching a flat plate and forming a bearing portion for a bar spring on one side, with the bearing portions oriented in the same direction. A configuration in which two are arranged in parallel is also conceivable. However, in such a configuration, the two toothed rollers are both inclined in the same direction, and only the tooth portion of one of the toothed rollers is strongly pressed against the printing surface, so that the printing surface is damaged. Is not preferred.
[0005]
Therefore, an object of the present invention is to provide a supporting device for a toothed roller in which two toothed rollers can be engaged with a printing surface with equal pressing force regardless of a costly molding method such as outsert molding, and It is an object of the present invention to provide a recording device provided with the recording device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a toothed roller supporting device according to a first aspect of the present invention engages with a printing surface of a printed material to support the printing surface, while advancing the printed material accompanying rotation of a driving roller A support device for supporting two toothed rollers so as to be driven and rotated in accordance with the following, wherein the support device comprises: a bar spring whose both ends are supported by a shaft holding portion; and a rotation around the bar spring. Two flat toothed rollers which are freely provided and have teeth formed all around; and two toothed rollers for allowing the two toothed rollers to tilt with respect to the axis of the bar spring. Bearing means for supporting the rollers from the outer surface side and the inner surface side of each toothed roller, wherein the rod spring is arranged around the rotation center of the two toothed rollers from the opposite surface side of the two toothed rollers. Extending in a direction parallel to the axis of A cylindrical bearing portion is formed which is in sliding contact with the outer peripheral surface of the bar spring. The two toothed rollers are arranged such that when the tooth portion is pressed against the outer peripheral surface or the printing surface of the drive roller, the bar spring is pressed. Is characterized by being positioned at a bending position.
[0007]
With the above configuration, the bar spring is bent upward due to the tooth portion being pressed against the outer peripheral surface or the printing surface of the drive roller. At this time, the lower end side of the two toothed rollers tends to open symmetrically due to the action of the bearing portion extending inward and the bar spring bent upward, so that the tooth portions of each toothed roller are positioned with respect to the printing surface. Engage with uniform pressure. Therefore, a biased load is applied only to one of the toothed rollers, and the printed surface is not damaged.
[0008]
Further, the toothed roller supporting device according to the second aspect of the present invention is configured such that, while engaging with the printing surface of the printed material and supporting the printing surface, the driven roller rotates in accordance with the progress of the printed material accompanying the rotational driving of the driving roller. A supporting device that supports two toothed rollers so that the supporting device is rotatably provided around a bar spring whose both ends are supported by a shaft holding unit, Two flat toothed rollers having teeth formed all around, and the two toothed rollers are each toothed so as to allow the two toothed rollers to tilt with respect to the axis of the bar spring. Bearing means for supporting from the outer surface side and the inner surface side of the roller, wherein the periphery of the rotation center of the two toothed rollers is parallel to the axis of the bar spring from the outward surface side of the two toothed rollers. And the outer peripheral surface of the bar spring A cylindrical bearing portion that is in contact is formed, and the two toothed rollers are positioned at a position where the bar spring bends when the tooth portion is pressed against the outer peripheral surface or the printing surface of the drive roller. It is characterized by having.
[0009]
With the above configuration, the bar spring is bent upward due to the tooth portion being pressed against the outer peripheral surface or the printing surface of the drive roller. At this time, due to the action of the outwardly extending bearing portion and the upwardly bent bar spring, the lower ends of the two toothed rollers approach symmetrically. And can be engaged with a uniform pressure. Therefore, a biased load is applied only to one of the toothed rollers, and the printed surface is not damaged.
[0010]
Further, according to the third aspect of the present invention, in the toothed roller supporting device according to the first aspect or the second aspect, the bearing portion may include a plane including a surface on a side where the bearing portion is formed. And extending in a direction parallel to the axis of the bar spring.
According to the present invention, since the toothed roller is formed three-dimensionally, a strong toothed roller is formed. Further, in a configuration in which the bearings of the two toothed rollers extend inward, the distance between the toothed rollers can be increased, so that it is possible to prevent a load from being locally applied to the printing surface and damaging the printing surface. .
[0011]
Further, according to a fourth aspect of the present invention, in the third aspect, the support device for the toothed roller according to the third aspect, wherein the bearing portion between the bearing portion of the two toothed rollers and the bearing portion is provided. In addition, a step-reduced diameter portion concentric with the bearing portion is formed which gradually decreases in diameter from the surface toward the bearing portion side. ADVANTAGE OF THE INVENTION According to this invention, the intensity | strength of a toothed roller can be increased by presence of a step diameter reduction part.
[0012]
Further, in the supporting device for a toothed roller according to a fifth aspect of the present invention, in the third aspect, between the surface on the side where the bearing portion of the two toothed rollers is formed and the bearing portion. In addition, a conical reduced diameter portion is formed concentrically with the bearing portion, the diameter of which is reduced at a constant rate from the surface toward the bearing portion side. According to the present invention, the strength of the toothed roller can be increased by the presence of the cone-shaped reduced diameter portion, and the cone-shaped reduced diameter portion can be formed relatively easily using a punching die.
[0013]
Further, a recording apparatus according to a sixth aspect of the present invention includes a recording medium transport unit, a recording execution unit that executes recording on a recording medium, and a recording medium discharge unit that discharges a recording medium. The recording medium discharging means is characterized in that the recording medium discharge means includes a toothed roller supporting device according to any one of the first to fifth aspects.
According to the present invention, since the two toothed rollers engage with the printing surface with equal pressure, a large load is applied only to one of the toothed rollers, and the printing surface is not damaged.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing the vicinity of a carriage of an ink jet printer including a supporting device for a toothed roller according to the present invention.
[0015]
In FIG. 1, reference numeral 1 denotes an ink-jet printer. The ink-jet printer 1 includes a printing unit 3 serving as a recording execution unit at the center thereof, a paper feeding unit 5 at a rear side, and a paper discharging unit 7 at a front side. ing. A carriage 9 is provided inside the printer, and the carriage 9 can reciprocate in a width direction of the printer, that is, a main scanning direction orthogonal to the paper surface at the time of printing. A print head 11 is provided at a lower end of the carriage 9, and a platen 13 is provided at a position facing the print head 11 to support a sheet serving as a recording medium from below at the time of printing. On the upstream side of the print head 11, there is provided a transport roller 19, which constitutes a main part of a recording medium transport unit including a transport drive roller 15 and a transport driven roller 17, and on the downstream side of the print head 11, a discharge drive roller 21. And a paper discharge roller 24 which constitutes a main part of a recording medium discharge means including a paper discharge roller 23 and a paper discharge driven roller 23.
[0016]
As shown in FIG. 2, the paper discharge driven roller 23 includes a single flat toothed roller 25 and two flat toothed rollers 25 that are displaced from each other in the sheet traveling direction. The device for supporting a toothed roller according to the invention is particularly applied to the side of two toothed rollers 25. Therefore, the support device for the two toothed rollers in the area denoted by reference numeral 27 in FIG. 2 will be specifically described below.
[0017]
As shown in FIG. 2, two toothed rollers 25 are rotatably provided around one bar spring 29. As shown in FIG. 2, the bar spring 29 is formed of a tightly wound torsion coil spring, and easily bends when a load is applied from a direction perpendicular to the longitudinal axis thereof, and when the load is released. It has the property of returning to the original linear state. Both ends of the bar spring 29 are supported by a shaft holding portion 30. The shaft holding portion 30 allows the bar spring 29 to bend when a load is applied to the bar spring 29 from a direction perpendicular to the axis thereof. The bar spring 29 is supported so as to perform the operation. As shown in FIGS. 4A and 4B, the toothed roller 25 is in pressure contact with the outer peripheral surface of the paper discharge drive roller 21 or the printed surface of the printed material, so that the bar spring 29 receives a load from below. Is bent upward.
[0018]
Each of the two toothed rollers 25 has the same configuration as shown in FIG. 3, and has a tooth portion 31 having a sharp-pointed tip at its entire periphery for engaging with the printing surface. Is formed. A through hole 33 is formed in the center of the toothed roller 25 so that the bar spring 29 can pass therethrough. A cylindrical bearing portion 35 extends from the periphery of the through hole 33 only in one direction. The bar spring 29 penetrates the inside of the bearing portion 35, and the inner peripheral surface of the bearing portion 35 is in sliding contact with the outer peripheral surface 37 of the bar spring 29, so that the toothed roller 25 smoothly moves around the bar spring 29. It can be rotated.
[0019]
Hereinafter, when the two toothed rollers 25 are distinguished from each other, the left toothed roller is denoted by 25a and the right toothed roller is denoted by 25b in FIG. Between the two toothed rollers 25 there is provided a longitudinally extending inner bearing 39 for supporting the toothed roller 25 from the inner side, and both ends 41 of the inner bearing 39 are connected to the two toothed rollers 25. It is adjacent to the inner surfaces of the two toothed rollers 25 at almost the middle in the vertical direction.
[0020]
An outer support member 43 is provided on each outer surface of the two toothed rollers 25 at a position closer to the bar spring 29 than the position of the inner support member 39. The outer support member 43 is arranged at a fixed distance from the outer surface of each of the toothed rollers 25a and 25b, and when the bar spring 29 is bent by this, as shown in FIGS. It is permissible that the roller 25 is inclined at a slight angle from a direction perpendicular to the axis of the bar spring 29 (more precisely, a direction perpendicular to the tangent to the bar spring 29 at the position where the toothed roller 25 is provided). Have been.
[0021]
Further, in one embodiment of the toothed roller support device of the present invention, as shown in FIG. 4A, the bearing portions 35 of each of the toothed rollers 25a and 25b are arranged such that the bearing portions 35 of the two toothed rollers face each other. Extending inward from By adopting such a configuration, when the tooth portion 31 of the toothed roller 25 is pressed against the outer peripheral surface of the paper discharge drive roller 21 or the printed surface of the printed material and the bar spring 29 is bent, the tooth portions 31 are directed inward together. Due to the presence of the formed bearing portion 35, the lower ends of the toothed rollers 25a and 25b tend to open symmetrically. Therefore, since the tooth portions 31 of the toothed rollers 25a and 25b can be engaged with the printing surface with a uniform pressure, a biased load is applied to only one of the toothed rollers, and the printing surface is damaged. There is nothing.
[0022]
In another embodiment of the toothed roller supporting device according to the present invention, as shown in FIG. 4B, the bearing portions 35 of the toothed rollers 25a and 25b are formed so that the bearing portions 35 of the two toothed rollers face outward. It extends outward from the surface. By adopting such a configuration, when the tooth portion 31 of the toothed roller 25 is pressed against the outer peripheral surface of the paper discharge drive roller 21 or the printed surface of the printed material, and the bar spring 29 is bent, both are outwardly directed. Due to the presence of the formed bearing portion 35, the lower ends of the toothed rollers 25a and 25b come closer to each other symmetrically. According to such an embodiment as well, similarly to the embodiment of FIG. 4A, a biased load is not applied to only one of the toothed rollers 25, so that it is possible to prevent the printed surface from being damaged. it can.
[0023]
FIG. 5 shows a modification of the embodiment shown in FIG. As shown in FIG. 5B in which the left toothed roller 25a is enlarged, the toothed roller 25 of the present example has a surface 45 on the side where the bearing portion 35 of the two toothed rollers 25a and 25b is formed and a bearing. A step-reducing portion 47 concentric with the bearing portion 35 is formed between the surface portion 45 and the bearing portion 35 so as to gradually reduce the diameter from the surface 45 toward the bearing portion 35 side. In this way, by forming the toothed roller 25 not three-dimensionally but three-dimensionally by the stepwise reduced diameter portion 47, the strength of the toothed roller 25 can be increased. Also, if the stepped diameter reducing portion 47 is formed inward toward the space between the two toothed rollers 25, even if the distance between the bearing portions 35 of each toothed roller 25 is the same, two toothed rollers 25 are formed. Since the interval between the rollers 25a and 25b can be made longer, it is possible to prevent a local load from being applied to the printing surface.
[0024]
Although FIG. 5B shows only the left toothed roller 25a, the right toothed roller 25b is symmetrical with the left toothed roller 25a as shown in FIG. 5A. It is formed in the form. Further, in the embodiment shown in FIG. 5, the step reduced diameter portion 47 is formed as two steps, but may be formed as one step, or three or more steps reduced diameter part 47. Further, as shown in FIG. 4B, even in a configuration in which the bearing portion 35 is formed outside each toothed roller 25, similarly, the step-diameter reduced portion 47 may be applied to each toothed roller 25. .
[0025]
Next, FIG. 6 shows still another modification of the embodiment shown in FIG. As shown in FIG. 6B in which the left toothed roller 25a is enlarged, the toothed roller 25 of the present example has a bearing 45 on the side on which the bearing portion 35 of the two toothed rollers 25a and 25b is formed. A conical diameter-reduced portion 49 concentric with the bearing portion is formed between the surface portion 45 and the bearing portion 35 at a constant rate. Also in this example, since the toothed roller 25 is formed three-dimensionally by the cone-shaped reduced diameter portion 49, the same effect as that of the embodiment shown in FIG. 5 can be obtained.
[0026]
Although FIG. 6B shows only the left toothed roller 25a, the right toothed roller 25b is symmetrical with the left toothed roller 25a as shown in FIG. 6A. It is formed in the form. Further, as shown in FIG. 4B, in a configuration in which the bearing portion 35 extends outside each toothed roller 25, the cone-shaped reduced diameter portion 49 may be applied to each toothed roller 25.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an ink jet printer of the present invention.
FIG. 2 is a plan view showing a part of a discharge driven roller.
FIG. 3 is a front view showing positions of a toothed roller, an inner support member, and an outer support member.
FIG. 4 is a side sectional view showing two embodiments of the present invention.
FIG. 5A is a side sectional view showing another embodiment, and FIG. 5B is an enlarged side sectional view of a toothed roller on the left side of FIG.
FIG. 6A is a side sectional view showing still another embodiment, and FIG. 6B is an enlarged side sectional view of a toothed roller on the left side of FIG.
FIG. 7 is a side sectional view showing a conventional toothed roller support device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ink-jet printer, 3 Printing part, 5 Paper supply part, 7 Paper discharge part, 9 Carriage, 11 Print head, 13 Platen, 15 Conveyance drive roller, 17 Conveyance driven roller, 19 Conveyance roller, 21 Paper discharge drive roller, 23 Discharge Paper driven roller, 24 discharge roller, 25, 25a, 25b toothed roller, 27 area to which the support device of the toothed roller of the present invention is applied, 29 bar spring, 30 shaft holder, 31 tooth, 33 through hole , 35 bearing portion, 37 outer peripheral surface of a bar spring, 39 inner supporting member, 41 both ends of the inner supporting member, 43 outer supporting member, 45 surface on which the bearing portion is formed, 47 step diameter reducing portion, 49 cone shape Reduced diameter part

Claims (6)

A support device for supporting two toothed rollers so as to be driven and rotated in accordance with the progress of a printed material accompanying the rotation of a driving roller while supporting the printed surface while engaging with the printed surface of the printed material, the support device comprising: The device
A bar spring whose both ends are supported by the shaft holding portion,
Two toothed rollers rotatably provided around the bar spring and having teeth formed all around;
Bearing means for supporting the two toothed rollers from the outer surface side and the inner surface side of each toothed roller so as to allow the inclination of the two toothed rollers with respect to the axis of the bar spring;
Around a rotation center of the two toothed rollers, a cylindrical shape extending from the opposite surface side of the two toothed rollers in a direction parallel to the axis of the bar spring and slidingly contacting the outer peripheral surface of the bar spring. Bearing part is formed,
The support of the toothed roller, wherein the two toothed rollers are positioned at a position where the bar spring bends when the tooth part is pressed against the outer peripheral surface or the printing surface of the drive roller. apparatus. A support device for supporting two toothed rollers so as to be driven and rotated in accordance with the progress of a printed material accompanying the rotation of a driving roller while supporting the printed surface while engaging with the printed surface of the printed material, the support device comprising: The device
A bar spring whose both ends are supported by the shaft holding portion,
Two toothed rollers rotatably provided around the bar spring and having teeth formed all around;
Bearing means for supporting the two toothed rollers from the outer surface side and the inner surface side of each toothed roller so as to allow the inclination of the two toothed rollers with respect to the axis of the bar spring;
A cylindrical shape extending around the center of rotation of the two toothed rollers from the outward surface side of the two toothed rollers in a direction parallel to the axis of the bar spring and slidingly contacting the outer peripheral surface of the bar spring. Bearing part is formed,
The support of the toothed roller, wherein the two toothed rollers are positioned at a position where the bar spring bends when the tooth part is pressed against the outer peripheral surface or the printing surface of the drive roller. apparatus. 3. The method according to claim 1, wherein the bearing portion starts from a position away from a plane including a surface on which the bearing portion is formed and extends in a direction parallel to an axis of the bar spring. 4. Characteristic device for supporting toothed rollers. 4. The bearing according to claim 3, wherein the diameter of the bearing is reduced stepwise from the surface of the two toothed rollers, on which the bearing is formed, to the bearing. A toothed roller support device, wherein a step-reducing portion concentric with the portion is formed. 4. The device according to claim 3, wherein the diameter of the two toothed rollers is reduced at a constant rate from the surface of the two toothed rollers on which the bearing portion is formed to the bearing portion side. A support device for a toothed roller, wherein a cone-shaped reduced diameter portion concentric with a bearing portion is formed. A recording apparatus comprising: a recording medium transport unit; a recording execution unit that executes recording on a recording medium; and a recording medium discharging unit that discharges a recording medium, wherein the recording medium discharging unit includes: A recording apparatus comprising the toothed roller support device according to claim 1.

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