JP4006586B2 - Toothed roller support device and recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a toothed roller that constitutes a discharge driven roller that is used in opposition to a discharge driving roller to discharge a printed material immediately after printing, and a recording apparatus such as an ink jet printer including the toothed roller.
[0002]
[Prior art]
In an ink jet printer that is one of recording apparatuses, a discharge roller is used to discharge a printed material immediately after printing. The paper discharge roller is located on the lower side of the print material discharge path, and is positioned on the upper side of the print material discharge path so as to face the paper discharge drive roller. And a toothed roller that is sharply sharpened so that the tip end of the head contacts the printing surface. This toothed roller is employed because the ink on the paper surface is not yet dried immediately after the ink is ejected onto the paper surface.
[0003]
FIG. 7 shows a conventional toothed roller support mechanism for paper discharge. As shown in FIG. 7, in the conventional toothed roller support mechanism 101, an outsert-shaped toothed roller 107 is rotatably provided around a bar spring 105 supported at both ends with respect to the shaft holding portion 103. Is. The outsert-molded toothed roller 107 has a roller base portion 109 formed in a ring shape, and a tooth portion 111 that engages with the printing surface is formed around the roller base portion 109. In addition, two toothed rollers 107 are arranged side by side, the flat opposing surfaces 113 of the roller base 109 in 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. Since the regulating member 117 is in contact with the toothed roller 107, the toothed roller 107 is restricted from swinging during rotation.
[0004]
[Problems to be solved by the invention]
However, the conventional toothed roller support mechanism 101 tends to be costly because the toothed roller 107 is outsert molded. By the way, instead of the outsert-shaped toothed roller 107, a flat-plate toothed roller in which a flat plate is punched and a bearing portion for a bar spring is formed on one side is set so that the orientation of the bearing portion is the same direction. A configuration in which two are arranged side by side 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 preferable.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a toothed roller support device in which two toothed rollers can be engaged with a printing surface with equal pressure contact force, regardless of a costly molding method such as outsert molding, and It is to provide a recording apparatus provided with the same.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the toothed roller supporting device according to the first aspect of the present invention engages with the printed surface of the printed material to support the printed surface, while the printed material advances as the drive roller rotates. A support device for supporting two toothed rollers so as to be driven and rotated in response to the shaft, wherein the support device is supported at both ends with respect to a shaft holding portion, and rotates around the rod spring. Two flat toothed rollers that are freely provided and have teeth on the entire periphery, and the two toothed rollers so as to allow inclination of the two toothed rollers with respect to the axis of the bar spring. Supporting means for supporting the rollers from the outer surface side and the inner surface side of each toothed roller, and around the rotation center of the two toothed rollers, the bar springs are provided from the opposing surface side of the two toothed rollers. Extending in a direction parallel to the axis of the A cylindrical bearing portion that is in sliding contact with the outer peripheral surface of the bar spring is formed, and when the two toothed rollers are in pressure contact with the outer peripheral surface or the printing surface of the drive roller, the bar spring It is characterized by being positioned at a position at which it bends.
[0007]
With the above-described configuration, the bar spring is bent upward due to the tooth portion being in pressure contact with the outer peripheral surface or the printing surface of the drive roller. At this time, due to the action of the bearing portion extending inward and the bar spring bent upward, the two toothed rollers open symmetrically at the lower end side, so that the tooth portions of each toothed roller are in contact with the printing surface. Engage with uniform pressure. Therefore, an uneven load is applied only to one toothed roller, and the printed surface is not damaged.
[0008]
Further, the toothed roller support device according to the second aspect of the present invention is driven and rotated in accordance with the progress of the printed material accompanying the rotational driving of the driving roller while engaging the printed surface of the printed material to support the printed surface. A support device for supporting two toothed rollers, wherein the support device is rotatably provided around a bar spring supported at both ends with respect to a shaft holding portion, Each of the two toothed rollers is provided with teeth so as to allow two flat toothed rollers having tooth portions formed around the entire circumference and inclination of the two toothed rollers 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, and around the rotation center of the two toothed rollers, parallel to the axis of the bar spring from the outward surface side of the two toothed rollers. Extending in any direction 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 in pressure contact with the outer peripheral surface or the printing surface of the drive roller. It is characterized by that.
[0009]
With the above-described configuration, the bar spring is bent upward due to the tooth portion being in pressure contact with the outer peripheral surface or the printing surface of the drive roller. At this time, due to the action of the bearing portion extending outward and the bar spring bent upward, the two toothed rollers approach the left and right sides symmetrically. And can be engaged with uniform pressure. Therefore, an uneven load is applied only to one toothed roller, and the printed surface is not damaged.
[0010]
A toothed roller support device according to a third aspect of the present invention is the plane including the surface on which the bearing portion is formed in the bearing portion in the first aspect or the second aspect. Starting from a position away from the rod spring, the rod spring extends in a direction parallel to the axis of the bar spring.
According to the present invention, since the toothed roller is three-dimensionally formed, a strong toothed roller is formed. Further, in the configuration in which the respective bearing portions of the two toothed rollers extend inward, the distance between the toothed rollers can be increased, and therefore it is possible to prevent the print surface from being locally loaded and damaged. .
[0011]
According to a fourth aspect of the present invention, there is provided the support device for the toothed roller according to the third aspect, wherein the bearing portion of the two toothed rollers is formed between the surface on which the bearing portion is formed and the bearing portion. Further, a step-reduced diameter portion concentric with the bearing portion that is gradually reduced in diameter from the surface toward the bearing portion side is formed. According to the present invention, the strength of the toothed roller can be increased due to the presence of the step-reduced diameter portion.
[0012]
A toothed roller support device according to a fifth aspect of the present invention is the device according to the third aspect, wherein the bearing portion of the two toothed rollers is formed between the surface on which the bearing portion is formed and the bearing portion. In addition, a cone-shaped reduced diameter portion concentric with the bearing portion that is reduced in diameter from the surface toward the bearing portion side at a constant rate is formed. According to the present invention, the strength of the toothed roller can be increased due to the presence of the cone-shaped reduced diameter portion, and the cone-shaped reduced diameter portion can be formed relatively easily using the punching die.
[0013]
A recording apparatus according to a sixth aspect of the present invention includes a recording medium transport unit, a recording execution unit that performs recording on the recording medium, and a recording medium discharge unit that discharges the recording medium. In the recording apparatus, the recording medium discharge means includes any one of the toothed roller support devices according to the first to fifth aspects.
According to the present invention, since the two toothed rollers are engaged with the printing surface with equal pressure, only one toothed roller is subjected to a large load and the printing surface is not damaged.
[0014]
DETAILED DESCRIPTION OF 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 periphery of a carriage of an ink jet printer having a toothed roller support device 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 forming a recording execution unit in the center thereof, a paper feeding unit 5 on the rear side, and a paper discharge unit 7 on the front side. ing. A carriage 9 is provided inside the printer, and the carriage 9 can reciprocate in the width direction of the printer, that is, the main scanning direction orthogonal to the paper surface during printing. A print head 11 is provided at the lower end of the carriage 9, and a platen 13 is provided at a position facing the print head 11 to support a sheet as a recording medium from the lower side during printing. Further, a transport roller 19 that is a main part of a recording medium transport unit including a transport drive roller 15 and a transport driven roller 17 is provided on the upstream side of the print head 11, and a paper discharge drive roller 21 is provided on the downstream side of the print head 11. And a paper discharge roller 24 which is a main part of the recording medium discharge means including the paper discharge driven roller 23.
[0016]
As shown in FIG. 2, the paper discharge driven roller 23 includes a single flat-plate toothed roller 25 and two flat-plate toothed rollers 25 that are shifted in the paper traveling direction. The toothed roller support device of the invention is particularly applied to the two toothed roller 25 sides. Therefore, the support device for the two toothed rollers in the region denoted by reference numeral 27 in FIG. 2 will be specifically described below.
[0017]
As shown in FIG. 2, the two toothed rollers 25 are rotatably provided around one bar spring 29. As shown in FIG. 2, the bar spring 29 is composed of a torsion coil spring that is tightly wound as a whole. When the load is applied from a direction perpendicular to the longitudinal axis, the rod spring 29 is easily bent and the load is eliminated. It has the property of returning to the original linear state. Both ends of the rod spring 29 are supported by a shaft holding portion 30, and the shaft holding portion 30 allows the rod spring 29 to bend when a load is applied to the rod spring 29 from a direction orthogonal to the axis. Thus, the bar spring 29 is supported. As shown in FIGS. 4 (a) and 4 (b), the toothed roller 25 is in pressure contact with the outer peripheral surface of the paper discharge driving roller 21 or the printed surface of the printed matter, whereby the bar spring 29 receives a load from below. Is bent upward.
[0018]
Each of the two toothed rollers 25 has the same form as shown in FIG. 3, and has a tooth portion 31 having a sharply sharp tip at the entire periphery thereof so as to engage with the printing surface. Is formed. A through hole 33 through which the bar spring 29 passes is formed in the center of the toothed roller 25, and a cylindrical bearing 35 extends only in one direction from the periphery of the through hole 33. A rod spring 29 penetrates inside 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 rod spring 29, so that the toothed roller 25 is smoothly around the rod spring 29. It can be rotated.
[0019]
Hereinafter, when the two toothed rollers 25 are distinguished, the left toothed roller is indicated by 25a in FIG. 2, and the right toothed roller is indicated by 25b. Between the two toothed rollers 25, there is provided an inner bearing member 39 extending in the longitudinal direction for supporting the toothed roller 25 from the inner surface side, and both ends 41 of the inner bearing member 39 are connected to the two toothed rollers 25. Adjacent to the inner surfaces of the two toothed rollers 25 approximately in the middle in the vertical direction.
[0020]
Further, on each outer surface side of the two toothed rollers 25, an outer support member 43 is provided 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 distance from the outer surface of each of the toothed rollers 25a and 25b. When the bar spring 29 is bent by this, as shown in FIGS. The attached roller 25 is allowed to incline by a slight angle from the direction perpendicular to the axis of the rod spring 29 (more precisely, the direction perpendicular to the tangent to the rod spring 29 at the position where the toothed roller 25 is provided). Has been.
[0021]
In the embodiment of the toothed roller support device according to the present invention, as shown in FIG. 4A, the bearing portions 35 of the toothed rollers 25a and 25b are both face sides of the two toothed rollers facing each other. It extends inward from. By adopting such a configuration, when the bar spring 29 is bent while the tooth portion 31 of the toothed roller 25 is pressed against the outer peripheral surface of the paper discharge driving roller 21 or the printed surface of the printed material, both are inwardly directed. Due to the presence of the formed bearing portion 35, the lower ends of the toothed rollers 25a and 25b open symmetrically. Accordingly, since the tooth portions 31 of the respective toothed rollers 25a and 25b can be engaged with the printing surface with a uniform pressure, only one of the toothed rollers is subjected to a biased load, so that the printing surface is damaged. There is nothing.
[0022]
In another embodiment of the toothed roller support device of the present invention, as shown in FIG. 4 (b), the bearing portions 35 of the toothed rollers 25a and 25b are both facing outwardly of the two toothed rollers. It extends outward from the surface. By adopting such a configuration, when the bar spring 29 is bent while the tooth portion 31 of the toothed roller 25 is pressed against the outer peripheral surface of the paper discharge driving roller 21 or the printing surface of the printed material, both are outwardly directed. Due to the presence of the formed bearing portion 35, the lower ends of the toothed rollers 25a and 25b approach each other symmetrically. Also in such an embodiment, as in the embodiment of FIG. 4A, since a biased load is not applied only to one toothed roller 25, it is possible to prevent the printing surface from being damaged. it can.
[0023]
FIG. 5 shows a modification of the embodiment shown in FIG. The toothed roller 25 of this example includes a bearing 45 and a bearing 45 on the side where the bearing portions 35 of the two toothed rollers 25a and 25b are formed, as shown in FIG. A step diameter-reduced portion 47 concentric with the bearing portion 35 is formed between the portion 35 and the bearing portion 35, and the diameter gradually decreases from the surface 45 toward the bearing portion 35 side. Thus, the strength of the toothed roller 25 can be increased by forming the toothed roller 25 three-dimensionally by the step-reduced diameter portion 47 instead of being flat. Further, if the step-reduced diameter portion 47 is formed inwardly 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 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]
5B shows only the left toothed roller 25a, but the right toothed roller 25b is symmetrical to the left toothed roller 25a as shown in FIG. 5A. It is formed into a form. In the embodiment shown in FIG. 5, the step-reduced diameter portion 47 is formed in two stages. However, the step-reduced diameter portion 47 may be formed in one stage or three or more stages. Further, as shown in FIG. 4B, the step-reduced diameter portion 47 may be applied to each toothed roller 25 similarly in the configuration in which the bearing portion 35 is formed outside each toothed roller 25. .
[0025]
Next, FIG. 6 shows still another modification of the embodiment shown in FIG. The toothed roller 25 of this example includes a bearing 45 and a bearing 45 on the side where the bearing portions 35 of the two toothed rollers 25a and 25b are formed, as shown in FIG. 6B in which the left toothed roller 25a is enlarged. A conical reduced diameter part 49 concentric with the bearing part is formed between the part 35 and the bearing part 35, and the diameter of the cone part is reduced from the surface 45 toward the bearing part 35. Also in this example, since the toothed roller 25 is three-dimensionally formed by the cone-shaped reduced diameter portion 49, the same effect as that of the embodiment shown in FIG. 5 can be obtained.
[0026]
FIG. 6B shows only the left toothed roller 25a, but the right toothed roller 25b is symmetrical to the left toothed roller 25a as shown in FIG. 6A. It is formed into a form. Further, as shown in FIG. 4B, in a configuration in which the bearing portion 35 extends to the outside of each toothed roller 25, a 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.
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.
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 Inkjet printer, 3 Printing part, 5 Paper feed part, 7 Paper discharge part, 9 Carriage, 11 Print head, 13 Platen, 15 Conveyance drive roller, 17 Conveyance driven roller, 19 Conveyance roller, 21 Discharge drive roller, 23 Discharge Paper driven roller, 24 paper discharge roller, 25, 25a, 25b toothed roller, 27 area to which the toothed roller support device of the present invention is applied, 29 bar spring, 30 shaft holding part, 31 tooth part, 33 through hole , 35 bearing part, 37 outer peripheral surface of bar spring, 39 inner bearing member, 41 both ends of inner bearing member, 43 outer bearing member, 45 surface on which bearing part is formed, 47 step reduced diameter part, 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 the printed material in accordance with the rotation of the drive roller while engaging the printed surface of the printed material and supporting the printed surface. The device
A rod spring supported at both ends with respect to the shaft holding portion;
Two toothed rollers that are rotatably provided around the bar spring and have teeth formed around the entire circumference;
Support 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 two toothed rollers to be inclined with respect to the axis of the bar spring;
Around the rotation center of the two toothed rollers is a cylindrical shape that extends in a direction parallel to the axis of the bar spring from the opposing surface side of the two toothed rollers and is in sliding contact with the outer peripheral surface of the bar spring. A bearing is formed,
The two toothed rollers are supported at a position where the bar spring is bent when the tooth portion is in pressure contact with an outer peripheral surface or a printing surface of the driving roller. apparatus. A support device for supporting two toothed rollers so as to be driven and rotated in accordance with the progress of the printed material in accordance with the rotation of the drive roller while engaging the printed surface of the printed material and supporting the printed surface. The device
A rod spring supported at both ends with respect to the shaft holding portion;
Two toothed rollers that are rotatably provided around the bar spring and have teeth formed around the entire circumference;
Support 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 two toothed rollers to be inclined with respect to the axis of the bar spring;
Around the rotation center of the two toothed rollers, a cylindrical shape that extends in a direction parallel to the axis of the bar spring from the outward surface side of the two toothed rollers and is in sliding contact with the outer peripheral surface of the bar spring The bearing part is formed,
The two toothed rollers are supported at a position where the bar spring is bent when the tooth portion is in pressure contact with an outer peripheral surface or a printing surface of the driving roller. apparatus. 3. The bearing according to claim 1, wherein the bearing portion starts from a position away from a plane including the surface on which the bearing portion is formed, and extends in a direction parallel to the axis of the rod spring. A toothed roller support device. 4. The bearing according to claim 3, wherein the diameter of the two toothed rollers is gradually reduced from the surface on which the bearing portion is formed to the bearing portion toward the bearing portion. A support device for a toothed roller, characterized in that a step diameter-reducing portion concentric with the portion is formed. In Claim 3, between the surface on the side where the bearing portions of the two toothed rollers are formed and the bearing portion, the diameter is reduced at a constant rate from the surface toward 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 transporting unit; a recording execution unit that executes recording on the recording medium; and a recording medium discharging unit that discharges the 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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