JP2006043994A - Carrying rotor and recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a material subjected to recording from being damaged or stained when the material subjected to the recording is carried. <P>SOLUTION: A spur 21, which is provided in the state of facing an ejection roller 10 for ejecting a recording sheet 11 recorded by a recording head 400a for performing the recording in ejecting ink and which is used for carrying the recording sheet 11 by having an outer periphery abut on the recording sheet 11, comprises: a rotary part 22 which is rotated on a rotary shaft 20; first and second gear parts 23a and 23b which are provided in the rotary part 22 in such a manner as to be juxtaposed in the direction of the rotary shaft 20, and whose tooth tips abut on the recording sheet 11; and a spacer member 24 which is provided in the rotary part 22 in such a manner as to be positioned between the first and second gear parts 23a and 23b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transport rotator for discharging a recording material such as a recording sheet on which characters, images, and the like are recorded by discharging ink, and a recording apparatus including the transport rotator.

  Conventionally, a recording apparatus that performs recording on a recording material such as a recording sheet or an OHP (overhead projector) sheet has been put into practical use in a form in which recording heads of various recording methods are mounted. Inkjet systems have become mainstream.

  Since an ink jet recording apparatus performs printing by ejecting ink droplets from a recording head, the recording material after recording is conveyed in a state where the ink on the recording surface is not sufficiently dried. For this reason, in the conventional recording apparatus, when the recording material after recording is conveyed, the recording surface of the recording material is pressed by a thin metal plate called a spur provided with a tooth tip forming a needle-like protrusion on the outer peripheral portion. A method for carrying out conveyance is employed.

  Since the spur contacts the surface of the recording material immediately after recording is performed, ink, paper powder, or the like adheres to the acicular protrusions and accumulates around the acicular protrusions. When these accumulation amounts increase, the ink or the like adhering to the spur is retransferred to the surface of the recording material, and the surface of the recording material may become dirty and the recording material may be soiled. In order to solve this problem, it is necessary to increase the height from the bottom of the needle-like protrusion to the tooth tip as much as possible.

  Further, since the surface of the recording material immediately after the recording is performed is soft with ink, the needle-like protrusions may be deeply stuck into the recording material by the pressing force of the spur. In particular, in order to perform high-definition printing of photographic images and the like, high accuracy is also required for the conveyance of the recording material by a spur. However, if the pressing force of the spur is increased to increase the conveyance accuracy, the recording material is There is a problem that the recording material is damaged due to dotted line holes or groove-like scratches.

  To prevent this problem, it is necessary to reduce the pitch of the needle-like projections as much as possible. However, as described above, the height of the needle-like projections is increased to prevent retransfer, and the pitch of the needle-like projections is reduced. In order to achieve this, it is necessary to increase the outer diameter of the spur, which increases the size of the recording device and increases the manufacturing cost of the spur.

As a technology for solving this problem, a configuration is disclosed in which the number of spur gear portions is increased to reduce the pressing force per gear portion (see Patent Document 1). This spur is configured by integrating two gear portions (disk members) whose outer circumferences are in contact with a recording material via a rotating portion (hub portion).
JP-A-10-114442

  However, in the conventional spur disclosed in Patent Document 1 described above, two gear parts are separately manufactured, and the rotating part formed on one gear part side is the rotating part of the other gear part. Therefore, it is difficult to make the phases of the tooth tips, which are needle-like protrusions of each gear portion, coincide with each other in the direction around the axis of the rotation shaft. As described above, in the conventional spur, a shift occurs in the phase of the tooth tip of each gear portion, thereby causing variation in the pressing force that presses the recording material, which may damage the recording material. .

  In addition, this conventional spur has engaging protrusions provided at a plurality of positions on the outer periphery of the protrusion when the protrusion of the rotation part of one gear part is press-fitted into the hole of the rotation part of the other gear part. Since each gear part is connected by elastically deforming or plastically deforming the parts, if the shape of each engagement protrusion varies, there is a difference in the amount of deformation due to elastic deformation or plastic deformation of each engagement protrusion. Therefore, it is difficult to match the center of the outer periphery (tooth tip circle) of each gear portion with high accuracy.

  Naturally, this conventional spur is also caused by errors in manufacturing parts such as the protrusions of the rotating part formed on one gear part and the concentricity of the hole part of the rotating part of the other gear part. There will be variations in the accuracy of the outer periphery.

  Accordingly, an object of the present invention is to provide a transport rotating body and a recording apparatus that can prevent the recording material from being damaged or soiled when the recording material recorded by the recording head is transported. .

  In order to achieve the above-described object, the transport rotating body according to the present invention is provided opposite to a discharge roller for discharging a recording medium material recorded by a recording head that discharges ink and performs recording. A transport rotating body for transporting a recording material with its outer periphery being in contact with a recording medium material, and a rotating portion that rotates about a rotation axis, and a recording portion that is provided side by side in the rotation axis direction on the rotating portion It has a plurality of gear parts with which a tooth tip contacts a material, and a spacer member provided in a rotation part among a plurality of gear parts.

  According to the transport rotating body configured as described above, the recording material is transported between the discharge roller and the plurality of gear portions by rotating the rotating portion around the rotation axis. And this conveyance rotation body is provided with a spacer member between a plurality of gear parts, and by positioning a plurality of gear parts with respect to the spacer member, a plurality of gear parts with respect to the rotation axis direction. Are positioned easily and with high accuracy. Therefore, according to this conveyance rotating body, it becomes possible to accurately position the center of the tooth tip circle and the phase of the tooth tip of each gear portion.

  In the present invention, matching the phase of the tooth tip of each gear portion means matching the tooth crest and crest, and the valley and trough of each gear portion, and the phase of the tooth tip is ½ cycle. Shifting only means that the crests and troughs and the troughs and crests of each gear part coincide with each other.

  As described above, according to the transport rotating body according to the present invention, the plurality of gear portions are positioned with respect to the spacer member, so that the center of the tooth tip circle between the gear portions and the phase of the tooth tip are accurately positioned. be able to. For this reason, according to the transport rotating body according to the present invention, it is possible to prevent the recording material from being damaged or fouled when the recorded recording material is transported.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the internal structure of the recording apparatus of the present embodiment. The portions not directly related to the exterior and the main part of the present invention are not shown. FIG. 2 shows a cross-sectional view of the vicinity of the recording unit and the paper discharge unit.

  Briefly describing the overall configuration of the recording apparatus of the present embodiment, the recording apparatus automatically feeds recording sheets, which are recording materials, one by one into the apparatus main body, as shown in FIGS. Unit 100, a recording sheet sent from automatic feeding unit 100 to a desired recording position, and then ejected from the recording position, and downstream of the conveying unit 200 in the conveyance direction of the recording sheet The sheet discharge unit 300 located on the side, the recording unit 400 including the recording head 400a that performs desired recording on the recording sheet conveyed to the recording position by the conveyance unit 200, and the recovery processing for the recording head 400a and the like of the recording unit 400 are performed. The recovery unit 600 to be performed is assembled to the chassis 701 and the like, respectively, and is configured to interlock appropriately. A platen 203 that supports and guides the recording sheet is provided at a recording position facing the recording unit 400. In FIG. 1, the conveyance direction of the recording sheet is indicated by an arrow A, and the scanning direction (reciprocating direction) of the recording unit 400 is indicated by an arrow B.

  As shown in FIG. 2, the transport unit 200 includes a transport roller 8 that is rotationally driven by a driving unit (not shown), and a pinch roller 9 that is pressed in the direction of the transport roller 8 by a pressing unit (not shown). Then, the recording sheet is sandwiched between the conveying roller 8 and the pinch roller 9 and conveyed to the recording unit 400 side. The recording sheet conveyed by the conveyance unit 200 is guided to the platen 203, recorded by the recording head 400 a mounted on the recording unit 400, and then conveyed to the paper discharge unit 300. The paper discharge unit 300 includes a discharge roller 10 that is rotationally driven by a driving unit (not shown), and a plurality of spurs 21 that are pressed toward the discharge roller 10 by a pressing unit (not shown). And the spur 21 sandwich the recording sheet and discharge it to the outside of the recording apparatus.

  FIG. 3 is a perspective view of the paper discharge unit 300. As shown in FIG. 3, the discharge roller 10 has a plurality of roller portions 10a provided at predetermined intervals in the axial direction of the rotary shaft 10b. Each roller portion 10a is formed of an elastic rubber material or the like.

  As shown in FIGS. 2 and 3, the spur 21 is provided at a position facing the roller portion 10 a of the discharge roller 10 so as to be rotatable around the rotation shaft 20. The spur 21 is provided with a rotating portion 22 having a shaft hole portion 22a through which the rotating shaft 20 is inserted, and an outer peripheral portion of the rotating portion 22 arranged side by side in the axial direction of the rotating shaft 20, and the tooth tips abut against the recording sheet 11. The first and second gear portions 23a and 23b are provided.

  The first and second gear portions 23a and 23b are formed in a disk shape from a metal material such as stainless steel, for example, and the acute-angle-shaped protrusions 25 that form a substantially needle shape, which is a tooth tip, are arranged at equal intervals (pitch). It is erected over. The first and second gear portions 23a and 23b are formed to have the same outer dimensions, and the diameter of the tip circle and the pitch of the protrusions 25 are equal.

  As shown in FIG. 3, in the recording sheet 11, the first and second gear portions 23a and 23b of each spur 21 are integrally rotated by rotating the discharge roller 10 and the spur 21. It is sandwiched between the first and second gear portions 23 a and 23 b and each roller portion 10 a of the discharge roller 10 and conveyed.

  FIG. 4 is a view for explaining the spur according to the first embodiment, in which FIG. 4 (a) is a perspective view, FIG. 4 (b) is an axial sectional view, and FIG. 4 (c) is a side view. The figure is shown.

  As shown in FIGS. 4 (a) and 4 (b), a first gear portion 23a and a second gear portion 23b are provided on the outer peripheral portion of the rotating portion 22 side by side in the axial direction. A spacer member 24 is provided between the first gear portion 23a and the second gear portion 23b for positioning the axial intervals of the gear portions 23a and 23b with high accuracy.

  The rotating portion 22 of the spur 21 is formed in a substantially cylindrical shape, and a shaft hole portion 22a through which the rotating shaft 20 is inserted is provided at the center. The rotating portions 22 are respectively formed with side surfaces 22b that are in contact with and slide against a regulating wall of a spur holding member (not shown) that regulates the movement of the spur 21 in the direction of the rotating shaft 20 at both ends in the direction of the rotating shaft 20. ing. Further, when the leading end of the recording sheet 11 in the conveyance direction is sandwiched between the first and second gear portions 23 a and 23 b and each roller portion 10 a of the discharge roller 10, the rotating portion 22 holds the recording sheet 11. An outer peripheral surface 22c for guiding is formed. In order for the spur 21 to smoothly rotate with the recording sheet 11 interposed therebetween, it is desirable that the side surface 22b and the outer peripheral surface 22c which are the sliding surfaces are formed smoothly. Therefore, the rotating part 22 is formed of, for example, a resin material such as polyacetal resin having a relatively high slidability.

  On the outer peripheral part of the rotating part 22, the first and second gear parts 23a, 23b are arranged so that the phase angles of the projections 25 of the gear parts 23a, 23b coincide with each other, that is, the phases are synchronized. In FIG. 4C, the protrusions 25 are overlapped.

  The spur 21 according to this embodiment is set in a molding die in a state in which the first gear portion 23a, the spacer member 24, and the second gear portion 23b are overlapped in this order, and insert molding is performed. It can be formed by accurately matching the tooth tip circle centers and the tooth tip phases of the protrusions 25 provided on the first and second gear portions 23a and 23b.

  The spacer member 24 is formed in a cylindrical shape, and both end surfaces in the axial direction are in contact with the first and second gear portions 23a and 23b, respectively. As shown in FIG. 4C, the outer diameter φD3 of the spacer member 24 is larger than the outer diameter φD1 of the rotating portion 22. Accordingly, when insert molding is performed, the clamping force in the molding die is received by the spacer member 24 via the first and second gear portions 23a and 23b, so that molding can be performed stably. Can do.

  On the other hand, the outer diameter φD3 of the spacer member 24 is made smaller than the root diameter φD2 of the projection 25 of the first and second gear portions 23a, 23b, and therefore the teeth of the projection 25 of the gear portions 23a, 23b. The recording sheet 11 can be satisfactorily prevented without impairing the depth of cut, which is bamboo.

  Alternatively, the first and second gear portions 23 a and 23 b may be positioned and fixed by fitting, press-fitting, caulking, and bonding to the spacer member 24. Since the outer diameter φD3 of the spacer member 24 is formed to be larger than the outer diameter φD1 of the rotating portion 22, the spacer member 24 receives a reaction force at the time of fitting or the like with the spacer member 24 having a large outer diameter. Therefore, the center of the tooth tip circle and the phase of the tooth tip between the protrusions 25 provided on the first and second gear portions 23a and 23b can be matched with high accuracy. Since the spacer member 24 receives force and heat at the time of press-fitting and molding, it is desirable that the spacer member 24 is made of a metal material such as stainless steel.

  As described above, according to the spur 21, the first and second gear portions 23 a and 23 b are positioned with respect to the spacer member 24. The phase can be accurately positioned.

  Moreover, according to this spur 21, since the space | interval of the 1st and 2nd gear parts 23a and 23b becomes the thickness of the rotating shaft direction of the spacer member 24, each gear is selected by selecting the thickness of the spacer member 24 suitably. The interval between the portions 23a and 23b can be easily set, and the recording sheet 11 can be prevented from being damaged or soiled.

  Further, according to this spur 21, by forming the gear portions 23a and 23b and the spacer member 24 in an overlapping manner, the structure of the molding die can be simplified and the manufacturing cost of the spur can be reduced. it can.

  Further, according to the recording apparatus including the spur 21, the spur 21 is pressed against the recording sheet 11 with a relatively large pressing force, thereby improving the conveyance accuracy of the recording sheet 11 and preventing the recording sheet 11 from being damaged or damaged. can do.

  Subsequently, a spur according to another embodiment will be described. FIG. 5 is a view for explaining a spur according to another embodiment, and FIG. 5 (a) is a perspective view, and FIG. 5 (b) is an axial sectional view.

  As shown in FIG. 5, the spacer member 34 made of a metal plate having a plate thickness of 1 mm or less is used as the spacer member, thereby further reducing the distance between the first gear portion 23a and the second gear portion 23b. Can do. Therefore, according to the spur 31, since the axial dimension is reduced, the axial dimension of the rotary shaft 20 and the spur holding member (not shown) can be reduced, and the entire recording apparatus can be reduced in size. Manufacturing costs can be reduced.

  According to the spur 21 or the spur 31 configured as described above, the first gear portion 23a, the spacer member 24 or the spacer member 34, and the second gear portion 23b are overlapped in this order and set in the molding die. When the insert molding is performed, the spur 21 having a wide interval between the adjacent gear portions 23a and 23b shown in FIG. 4 can be obtained simply by changing the clamping interval of the molding die according to the thickness of the spacer member. 5 and the spur 31 with a narrow interval between the adjacent gear portions 23a and 23b can be easily manufactured.

  Alternatively, the first and second gear portions 23a and 23b may be positioned and fixed to the spacer member 24 or the spacer member 34 by fitting, press-fitting, caulking, adhesion, or the like. In any case, various types of spurs with different intervals between adjacent gear portions can be easily manufactured without increasing the types of molding dies and parts. For this reason, for example, the spur 31 having a narrow interval between the gear portions 23a and 23b and the spur 21 having a wide interval between the gear portions 23a and 23b are appropriately disposed in the recording apparatus, thereby further improving the damage and contamination of the recording sheet 11. Can be prevented.

  6A and 6B are diagrams for explaining a spur according to the second embodiment, and FIG. 6A is a perspective view and FIG. 6B is an axial sectional view.

  As shown in FIG. 6, the spur 41 of the second embodiment is provided between the first, second, and third gear portions 23 a, 23 b, and 23 c having the same outer dimensions and the adjacent gear portions 23 a and 23 b. And first and second spacer members 34a and 34b disposed between the adjacent gear portions 23b and 23c, respectively. The first, second, and third gear portions 23a, 23b, and 23c are disposed on the rotating portion 22 so that the angular phases of the protrusions 25 are all matched. The first and second spacer members 34a and 34b are formed to have the same outer dimensions.

  According to the spur 41 according to the present embodiment, since the three projections 25 by the respective gear portions 23a, 23b, and 23c are simultaneously brought into contact with the recording sheet 11 for conveyance, the spur 41 is recorded with a larger pressing force. Even when the sheet 11 is pressed, the conveyance accuracy can be improved without damaging the recording sheet 11.

  Further, according to the spur 41, the number of the gear portions 23 can be increased without increasing the axial dimension. Therefore, the axial dimension of the rotary shaft 20 and the spur holding member is increased, and the entire recording apparatus is increased in size. And increase in manufacturing cost can be suppressed.

  FIG. 7 is a view for explaining a spur according to the third embodiment, in which FIG. 7 (a) is a perspective view, FIG. 7 (b) is an axial sectional view, and FIG. 7 (c) is a gear. The enlarged view which shows a part is shown.

  As shown in FIG. 7, the spur 51 according to the third embodiment has first and second gear portions 23a and 23b having the same outer dimensions. The first and second gear portions 23a and 23b are formed with protrusions 25 by etching a metal plate, and as shown in FIG. 7 (c), an enlarged portion C in FIG. 7 (b) is shown. The plate thickness direction is also eroded by etching. The spur 51 is arranged on the rotating portion 22 such that the first gear portion 23a and the second gear portion 23b are overlapped so that the surfaces eroded by etching are in contact with each other.

  According to the spur 51 according to the present embodiment, the two protrusions 25 are brought into contact with the recording sheet 11 and conveyed at a very narrow interval that is not more than twice the thickness of the metal plate forming the gear portion 23. Therefore, the recording sheet 11 can be further prevented from being damaged or soiled. Further, the spur 51 can be manufactured at a lower cost by not including the spacer member.

  FIG. 8 is a view for explaining a spur according to the fourth embodiment, in which FIG. 8 (a) is a perspective view, FIG. 8 (b) is an axial sectional view, and FIG. 8 (c) is a side view. The figure is shown.

  As shown in FIG. 8, the spur 61 according to the fourth embodiment has first, second, third, and fourth gear portions 23a, 23b, 23c, and 23d having the same shape. The first gear portion 23a and the third gear portion 23c, and the second gear portion 23b and the fourth gear portion 23d have the angular phases of the protrusions 25 provided on the first gear portion 23a and the fourth gear portion 23d, respectively. And the pair of gears of the third gear portions 23a and 23c and the pair of gears of the second and fourth gear portions 23b and 23d are shifted in the angular phase of the projection 25 by a half period of the circumferential arrangement pitch. In a state of being stacked, they are arranged in a superimposed manner. That is, the first and third gear portions 23a and 23c and the second and fourth gear portions 23b and 23d are positioned so that the crests and troughs of the gears formed by the protrusions 25 coincide with each other.

  Therefore, in this spur 61, the second gear portion 23b functions as a spacer member for the first and third gear portions 23a, 23c, and the third gear portion 23b, 23d is the third gear portion. The gear portion 23c functions as a spacer member.

  According to such a spur 61, when the recording sheet 11 is conveyed, the two protrusions 25 provided on the first and third gear portions 23a and 23c and the second and fourth gear portions 23b are provided. , 23d are in contact with the recording sheet 11 alternately at short intervals, so that the pitch of the protrusions 25 is apparently reduced to ½. Damage can be prevented more favorably, and the conveyance accuracy of the recording sheet 11 can be improved.

1 is a perspective view showing an internal structure of a recording apparatus according to an embodiment. FIG. 2 is a cross-sectional view illustrating the vicinity of a recording unit and a paper discharge unit of the recording apparatus illustrated in FIG. 1. It is a perspective view which shows a spur. It is a figure for demonstrating the spur which concerns on 1st Embodiment. It is a figure for demonstrating the spur which concerns on other embodiment. It is a figure for demonstrating the spur which concerns on 2nd Embodiment. It is a figure for demonstrating the spur which concerns on 3rd Embodiment. It is a figure for demonstrating the spur which concerns on 4th Embodiment.

Explanation of symbols

8 Conveying roller 9 Pinch roller 10 Discharging roller 11 Recording sheet 21, 31, 41, 51, 61 Spur 25 Protrusion 22 Rotating part 23a First gear part 23b Second gear part 24 Spacer member 300 Paper discharging part 400 Recording part 400a Recording head

Claims (8)

A recording head that discharges ink and records by a recording head that discharges the recording medium material that is recorded is provided opposite to the discharge roller, and the recording medium material is brought into contact with the outer periphery to convey the recording material. A transport rotating body of
A rotating part that rotates about a rotation axis;
A plurality of gear portions that are provided in the rotating portion along the rotation axis direction and in which tooth tips come into contact with the recording material;
A conveying rotating body comprising a spacer member provided between the plurality of gear portions on the rotating portion.   The rotating part is formed of a resin material into a cylindrical shape having a shaft hole through which the rotating shaft is inserted, and both end surfaces in the rotating shaft direction support the rotating shaft when rotating around the rotating shaft. The conveyance rotation body according to claim 1, wherein the movement in the direction of the rotation axis is regulated by being slid by a supporting member.   The spacer member is provided in contact with the adjacent gear portion, and the outer diameter of the spacer member is larger than the outer diameter of the rotating portion, and the outer diameter of the spacer member is the root circle of the gear portion. The conveyance rotation body according to claim 2 smaller than a diameter.   The conveying rotating body according to any one of claims 1 to 3, wherein the spacer member is formed of a metal plate so that a plate thickness in the rotation axis direction is 1 mm or less. Conveying for transporting the recording material with the outer periphery being in contact with the recording material, provided opposite the discharge roller for discharging the recording material recorded by the recording head that performs recording by discharging ink A rotating body,
The transport rotator includes a rotating portion that rotates around a rotating shaft, and a plurality of gear portions that are arranged in the rotating portion in the rotating shaft direction and have tooth tips in contact with the recording material. ,
The conveyance rotating body, wherein the gear portion is formed by eroding a metal plate by etching, and is disposed so that surfaces eroded in a plate thickness direction of the metal plate are in contact with each other.   The conveying rotating body according to any one of claims 1 to 5, wherein the plurality of gear portions are provided in the rotating portion so that a phase of a tooth tip coincides with the rotation axis.   The conveying rotation according to any one of claims 1 to 5, wherein the plurality of gear portions are provided in the rotating portion with a phase of a tooth tip shifted by a half period with respect to the rotation axis. body. A recording head for recording by discharging ink; a discharge roller for discharging the recording material recorded by the recording head; and an outer periphery abutting on the recording material provided opposite to the discharge roller A recording apparatus comprising a conveying rotating body for conveying a recording material,
A recording apparatus comprising the conveyance rotating body according to claim 1.

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