JP4013838B2 - Feeding device and liquid ejecting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a feeding device and a liquid ejecting apparatus. In particular, the present invention relates to a feeding device and a liquid ejecting apparatus in which the accuracy of the feeding amount of a recording material is improved.
[0002]
[Prior art]
A liquid ejecting apparatus such as an ink jet recording apparatus includes a feeding device that feeds a recording material (for example, recording paper) placed on a tray to a recording area, and a recording material fed by the feeding device. It has a conveying device that conveys little by little. Recording is performed on the recording material by ejecting liquid (for example, ink) while shifting the recording material fed by the feeding device by the transport device.
As an example of the feeding device, there is one having a feeding roller having a substantially D-shaped cross section and driven by a motor, and a separation pad or a retard roller biased toward the feeding roller (for example, a patent) Reference 1). In such a feeding device, the feeding roller feeds the recording material by rotating the recording material between the separation pad or the retard roller. The circumferential length of the surface of the feeding roller that contacts the recording material, that is, the substantially D-shaped curved surface, is slightly longer than the distance to which the recording material is to be fed. The feeding roller rotates once every time the recording material is fed, and then waits with the surface in contact with the recording material facing away from the feeding path of the recording material. At this time, the feeding roller is separated from the retard roller.
[0003]
[Patent Document 1]
JP 2002-255417 (FIG. 1)
[0004]
[Problems to be solved by the invention]
In a state where the feeding roller has finished feeding the recording material, the trailing edge of the recording material remains on the tray. When the tray places the recording material obliquely with respect to the feeding direction, the recording material is fed by the conveying device in a bent state because the rear end remains on the tray. For this reason, there is a possibility that the recording material contacts the feeding roller due to the restoring force of the recording material and is subjected to friction while the recording material is being conveyed by the conveying device. In such a state, there is a possibility that the conveyance accuracy of the recording material by the conveyance device is lowered.
[0005]
SUMMARY An advantage of some aspects of the invention is to provide a feeding device and a liquid ejecting apparatus that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.
[0006]
[Means for Solving the Problems]
That is, according to the first aspect of the present invention, it is used in a liquid ejecting apparatus that performs recording by ejecting liquid onto a recording material fed to the recording area, and feeds the recording material to the recording area. A feeding device, a placement unit for placing a recording material obliquely with respect to a feeding path of the recording material, and a feeding roller driven by a motor and rotated to feed the recording material A substantially D-shaped feeding roller disposed above the feeding path of the recording material and having a roller surface in contact with the recording material cut out by a notch surface parallel to the rotation axis. When the feeding of the recording material is completed, the roller stops at the cut surface toward the recording material feeding path and enters a standby state, and is provided at a position different from the feeding roller in the axial direction. In order to prevent the cut surface from coming into contact with the recording material when the feeding roller is in the standby state, E Bei auxiliary rollers projecting the recording object side than the surface, the feed roller is provided at an end of the upstream side in the rotation direction of the cut-away surface, to extend the roller surface, projecting upwardly from the truncated face The auxiliary roller provides a feeding device that is provided at a position that protrudes closer to the recording material than the protruding portion in order to prevent the protruding portion of the cut surface from coming into contact with the recording material .
According to this feeding device, even when the feeding roller finishes feeding the recording material and enters a standby state, and the recording material moves toward the feeding roller by a restoring force, the recording material is fed. Hit the auxiliary roller without hitting the roller. Therefore, even if the rear end of the recording object being recorded remains in the mounting portion, the feeding roller does not give friction to the recording object. Further, it is possible to prevent the recording material from hitting the protruding portion of the feeding roller.
[0007]
An elastic member is wound around the roller surface and the notch surface along the rotation direction of the feed roller , and the feed roller is provided at the base of the protruding portion and has a pressing member that presses the elastic member toward the feed roller. May be.
Here, when the radius of the auxiliary roller is made larger than the radius of curvature of the tip of the protrusion, it is possible to reliably prevent the recording material from hitting the protrusion.
[0008]
In the case where the placement unit places the recording material close to one side in the width direction, the auxiliary roller is preferably disposed closer to one side in the placement unit than the feeding roller in the axial direction. . In this way, it is possible to prevent the recording material from hitting the feeding roller when feeding the recording material of any size.
[0009]
According to the second aspect of the present invention, there is provided a liquid ejecting apparatus that performs recording by ejecting liquid onto a recording material fed to a recording area, and the recording material is fed to a feeding path of the recording material. And a feeding roller that is driven by a motor and rotated to feed the recording material, and is disposed above the feeding path of the recording material. A substantially D-shaped feeding roller in which a roller surface in contact with an object is cut out by a notch surface parallel to the rotation axis, and the feeding roller covers the notch surface when feeding of the recording object is completed. Stops toward the recording material feed path and enters a standby state, and is provided at a position different from the feeding roller in the axial direction. Bei example an auxiliary roller that protrudes recording object side than the cut-away surface to prevent contact, feeding The roller is provided at an upstream end of the notch surface in the rotation direction, and has a protrusion protruding upward from the notch surface so as to extend the roller surface. The auxiliary roller has a protrusion on the notch surface covered. Provided is a liquid ejecting apparatus provided at a position protruding from a protruding portion toward a recording material side so as to prevent contact with a recorded material . According to the 2nd form, the same effect as the 1st form can be acquired.
[0010]
The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.
[0012]
FIG. 1 is a perspective view of an ink jet recording apparatus 10 according to an embodiment of the present invention. 2 is a cross-sectional view of the ink jet recording apparatus 10 cut along a plane that includes the straight line L and is perpendicular to the bottom surface of the ink jet recording apparatus 10 in FIG. It is the figure which looked at the cut surface from the A direction. In FIG. 2, the ink jet recording apparatus 10 has finished feeding the recording object 11 toward the recording area. In FIG. 3, the ink jet recording apparatus 10 is feeding the recording object 11. It is in the middle.
[0013]
The ink jet recording apparatus 10 includes a placing tray 12 that places the recording object 11 obliquely with respect to the feeding path, and a hopper 124 that pushes up the recording object 11 placed on the placing tray 12 to the feeding path. The recording material 11 pushed up by the hopper 124 is taken out one by one and fed toward the recording area, and the recording material 11 fed by the feeding section 20 is conveyed to the recording area. The roller 32 and the transport driven roller 34, a recording head (not shown) that performs recording by ejecting liquid onto the recording material 11 transported to the recording area, a carriage 42 that mounts the recording head, and straddling the recording area A carriage drive motor 48 for reciprocating the carriage 42, a discharge roller 52 and a discharge driven roller 54 for discharging the recorded object 11 from the recording area, and a hot 124, comprising the step motor 60 that drives the conveying roller 32 and the discharge roller 52. The loading tray 12 holds the recording material 11 in a state where the recording material 11 is brought close to the side on which the carriage 42 stands by (the right side in FIG. 1). Power is transmitted from the step motor 60 to the transport roller 32 and the discharge roller 52 via a single drive belt 62. The drive belt 62 is tensioned by a tensioner (not shown). The step motor 60, the tensioner, the conveyance roller 32, and the discharge roller 52 are arranged in this order in the flow direction of the drive belt 62. Note that the power of the step motor 60 is transmitted to the feeding unit 20 and the hopper 124 via the drive shaft 36 of the transport roller 32 and the gear mechanism 38 provided at the end of the drive shaft 36.
[0014]
The feeding unit 20 includes a feeding roller 22 that is rotated by a step motor 60 and a retard roller 24. The retard roller 24 is disposed at a position facing the feeding roller 22 across the feeding path of the recording material 11. The feeding roller 22 and the retard roller 24 are fed between the conveying roller 32 and the conveying driven roller 34 while bending the recording material 11 positioned at the top of the bundle of the recording materials 11 pushed up by the hopper 124. To send. Here, when only the recording material 11 positioned at the uppermost position comes between the feeding roller 22 and the retard roller 24, the retard roller 24 follows the recording material 11 fed by the feeding roller 22. Further, when a plurality of recording objects 11 come between the feeding roller 22 and the retard roller 24, the frictional force generated between the retard roller 24 and the recording object 11 is more than the frictional force generated between the recording objects 11. Because of the large size, the retard roller 24 does not rotate. For this reason, the recording material 11 positioned at the top is fed by the feeding roller 22, but the other recording material 11 is held by the frictional force with the retard roller 24 and is not fed.
The feeding unit 20 waits in the state shown in FIG. 2 until the recording material 11 is fed after the recording material 11 is fed to a position where the leading end reaches the conveyance roller 32 and the conveyance driven roller 34. ing. Note that a separation pad may be provided instead of the retard roller 24.
[0015]
The conveyance roller 32 and the conveyance driven roller 34, and the discharge roller 52 and the discharge driven roller 54 convey the recording material 11 every time the carriage 42 scans, in order to perform recording on the entire recording material 11. Here, the feeding unit 20 has a configuration that prevents the recording material 11 being recorded from coming into contact with the feeding roller 22 so that the feeding roller 22 does not apply a frictional force to the recording material 11. Yes. With this configuration, the conveyance roller 32 and the conveyance driven roller 34, and the discharge roller 52 and the discharge driven roller 54 can accurately convey the recording object 11 being recorded.
[0016]
Next, details of the feeding unit 20 will be described with reference to FIGS. 2, 4, and 5. 4 is a rear view of the feeding unit 20 as viewed from the back of the ink jet recording apparatus 10, that is, from the direction C in FIG. 2, and FIG. 5 is a perspective view of the feeding unit 20 as viewed from the back of the ink jet recording apparatus 10. It is. 4 and 5 are partially different from each other.
[0017]
The feeding roller 22 has a substantially D shape in which a roller surface 22 a that is a surface in contact with the recording material 11 is cut out by a notch surface 22 b parallel to the rotation axis of the feeding roller 22. The roller surface 22a and the notch surface 22b wind and hold an elastic member 22e formed of a material (for example, an elastomer) having a high friction coefficient with respect to the recording material 11 along the rotation direction.
Further, the feeding roller 22 has a protruding portion 22c at the end of the notch surface 22b on the upstream side in the rotation direction. The protrusion 22c protrudes above the notch surface 22b of the feed roller 22 so as to extend the roller surface 22a. Further, as shown in FIG. 4, a pressing member 22 d that presses the elastic member 22 e toward the feeding roller 22 is provided at the base of the protruding portion 22 c. By providing the protrusion 22c and the pressing member 22d, the elastic member 22e is less likely to be displaced during feeding.
[0018]
The retard roller 24 is rotatably held by the holding portion 25. The holding unit 25 rotates about one end, but is biased by a biasing unit (not shown) so that the retard roller 24 rotates in a direction approaching the feeding roller 22. The rotation range of the holding unit 25 is such that the retard roller 24 interferes with the roller surface 22a of the roller surface of the feed roller 22 from a position where the retard roller 24 does not interfere with any part of the feed roller 22, but a notch surface. It is to the position which does not interfere with 22b. Specifically, the holding unit 25 rotates to a position where the retard roller 24 comes into contact with the lower surface portion 12 a of the loading tray 12.
[0019]
The feeding unit 20 includes an auxiliary roller 28 that is rotatably arranged. The auxiliary roller 28 has a cylindrical shape and is formed of a material having a lower coefficient of friction with respect to the recording material 11 than the elastic member 22e of the feeding roller 22. As shown in FIG. 2, the auxiliary roller 28 protrudes closer to the recording material 11 than the protruding portion 22 c when the feeding unit 20 is in a standby state to prevent the protruding portion 22 c from coming into contact with the recording material 11. It is provided in the position to do. The radius of the auxiliary roller 28 is larger than the radius of curvature of the tip of the protrusion 22c, and includes the tip of the protrusion 22c on the inside when viewed from the side.
As shown in FIGS. 4 and 5, the auxiliary roller 28 is disposed at a position parallel to the feeding roller 22 and different in the axial direction. Specifically, in the axial direction, the auxiliary roller 28 is closer to the side on which the recording tray 11 is approaching the recording material 11, that is, the side on which the carriage 42 is waiting (the left side in FIGS. 4 and 5). Has been placed.
[0020]
For this reason, when the feeding roller 22 and the retard roller 24 are separated from each other, even if the recording object 11 being recorded approaches the feeding roller 22 by the restoring force, it does not hit the protruding portion 22c of the feeding roller 22. It corresponds to the auxiliary roller 28. Therefore, the recording material 11 being recorded does not receive a large frictional force from the feeding unit 20. Therefore, the conveyance roller 32 and the conveyance driven roller 34, and the discharge roller 52 and the discharge driven roller 54 can accurately convey the recording object 11 being recorded. In particular, when the recording tray 11 is loaded with a large number of recording objects 11, the recording object 11 being recorded is closer to the feeding roller 22, so the auxiliary roller 28 is particularly effective.
Further, since the auxiliary roller 28 is arranged in the axial direction on the side where the recording tray 11 is closer to the recording material 11 than the feeding roller 22, any size of the recording material 11 is fed. In this case, the recording material 11 can be prevented from coming into contact with the feeding roller 22.
[0021]
Further, the axial distance between the feeding roller 22 and the retard roller 24 and the auxiliary roller 28 is set to a sufficient distance for the recording material 11 being fed to be elastically deformed in the axial direction. In this way, even if the auxiliary roller 28 is provided, the feeding roller 22 and the retard roller 24 can feed the recording material 11 without making a crease or the like.
[0022]
As a means for preventing the protruding portion 22c of the feeding roller 22 from hitting the recording material 11 in the standby state, a method of providing a plastic guide on the side surface of the feeding roller 22 so as to protrude from the roller surface 22a. is there. However, since this guide prevents the roller surface 22a from hitting the recording material 11 even when the recording material 11 is fed, the vicinity of the protrusion 22c does not fulfill the function of feeding the recording material 11.
On the other hand, according to the present embodiment, the roller surface 22a of the feeding roller 22 has a function of feeding the recording material 11 with the entire circumference being in contact with the recording material 11 when feeding the recording material 11. Fulfill. For this reason, the feeding distance of the recording material 11 can be secured without increasing the diameter of the feeding roller 22. If a sufficient feeding distance can be secured, even if a slip occurs between the roller surface 22a and the recording material 11, the recording material 11 can be fed to the conveyance roller 32 and the conveyance driven roller.
[0023]
The ink jet recording apparatus 10 is an example of a liquid ejecting apparatus. The recording head of the ink jet recording apparatus is an example of a liquid ejecting unit of the liquid ejecting apparatus.
However, the present invention is not limited to these. Another example of the liquid ejecting apparatus is a color filter manufacturing apparatus that manufactures a color filter for a liquid crystal display. In this case, the color material ejecting head of the color filter manufacturing apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is an electrode forming apparatus that forms electrodes such as an organic EL display and an FED (surface emitting display). In this case, the electrode material (conductive paste) ejecting head of the electrode forming apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is a biochip manufacturing apparatus that manufactures a biochip. In this case, the bio-organic substance ejecting head of the biochip manufacturing apparatus and the sample ejecting head as a precision pipette are examples of the liquid ejecting head. The liquid ejecting apparatus of the present invention includes other liquid ejecting apparatuses having industrial use. The recording object 11 is an object on which recording, writing, or printing is performed by ejecting a liquid. For example, a recording substrate, a circuit board on which a circuit pattern such as a display electrode is printed, and a CD on which a label is printed. -ROM, preparations on which DNA circuits are printed are included.
[0024]
As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.
[Brief description of the drawings]
1 is a perspective view of an ink jet recording apparatus 10. FIG. 3 is a cross sectional view of an ink jet recording apparatus 10. FIG. 4 is a rear view of a feeding unit 20. FIG. ] Rear perspective view of feeding unit 20 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Inkjet recording device, 11 ... Recording object, 12 ... Loading tray, 12a ... Lower surface part, 20 ... Feeding part, 22 ... Feeding roller, 22a ... Roller surface, 22b ... Notch surface, 22c ... Projection part , 22d: pressing member, 22e: elastic member, 24: retard roller, 25: holding portion, 28 ... auxiliary roller, 32 ... transport roller, 34: transport driven roller, 42 ... carriage, 48 ... carriage drive motor, 52 ... discharge Roller 54 ... Discharge driven roller 60 ... Step motor 62 ... Drive belt 124 ... Hopper

Claims (5)

A feeding device that is used in a liquid ejecting apparatus that performs recording by ejecting liquid onto a recording material fed to a recording area, and that feeds the recording material to the recording area;
A mounting section for mounting the recording object obliquely with respect to a feeding path of the recording object;
A feeding roller driven by a motor and rotating to feed the recording material, the roller being disposed above the feeding path of the recording material and having a roller surface in contact with the recording material as a rotating shaft A substantially D-shaped feeding roller that is notched with a notch surface parallel to the
When the feeding of the recording material is completed, the feeding roller stops the cut surface toward the feeding path of the recording material and enters a standby state.
Further, the recording roller is provided at a position different from the feeding roller in the axial direction, and the recording surface is more than the cut surface to prevent the cut surface from coming into contact with the recording material when the feeding roller is in a standby state. e Bei auxiliary rollers projecting at the object side,
The feeding roller is provided at an end of the notch surface on the upstream side in the rotation direction, and has a protruding portion protruding upward from the notch surface so as to extend the roller surface,
The feeding device , wherein the auxiliary roller is provided at a position protruding from the protruding portion toward the recording material to prevent the protruding portion of the cut-out surface from coming into contact with the recording material . An elastic member is wound around the roller surface and the notch surface along the rotation direction of the feeding roller, and held.
The feed roller is provided at the base of the protrusion, has a pressing member for pressing toward said elastic member to said feeding roller, feeding of Claim 1 device.   The feeding device according to claim 2, wherein the auxiliary roller has a radius larger than a radius of curvature of a tip of the protruding portion. The placing portion is placed by placing the recording object in one side in the width direction,
2. The feeding device according to claim 1, wherein the auxiliary roller is disposed closer to the one side of the placement unit than the feeding roller in the axial direction. A liquid ejecting apparatus that performs recording by ejecting liquid onto a recording material fed to a recording area,
A mounting section for mounting the recording object obliquely with respect to a feeding path of the recording object;
A feeding roller driven by a motor and rotating to feed the recording material, the roller being disposed above the feeding path of the recording material and having a roller surface in contact with the recording material as a rotating shaft A substantially D-shaped feeding roller that is notched with a notch surface parallel to the
When the feeding of the recording material is completed, the feeding roller stops the cut surface toward the feeding path of the recording material and enters a standby state.
Further, the recording roller is provided at a position different from the feeding roller in the axial direction, and the recording surface is more than the cut surface to prevent the cut surface from coming into contact with the recording material when the feeding roller is in a standby state. e Bei auxiliary rollers projecting at the object side,
The feeding roller is provided at an end of the notch surface on the upstream side in the rotation direction, and has a protruding portion protruding upward from the notch surface so as to extend the roller surface,
The liquid ejecting apparatus , wherein the auxiliary roller is provided at a position protruding from the protruding portion toward the recording material side so as to prevent the protruding portion of the cutout surface from coming into contact with the recording material .

Images