JP3712222B2 - Inkjet recording device - Google Patents

Inkjet recording device Download PDF

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Publication number
JP3712222B2
JP3712222B2 JP26816297A JP26816297A JP3712222B2 JP 3712222 B2 JP3712222 B2 JP 3712222B2 JP 26816297 A JP26816297 A JP 26816297A JP 26816297 A JP26816297 A JP 26816297A JP 3712222 B2 JP3712222 B2 JP 3712222B2
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JP
Japan
Prior art keywords
cap
recording head
carriage
ink
paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP26816297A
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Japanese (ja)
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JPH10202916A (en
Inventor
信敏 大塚
淳 小林
和久 川上
聖二 望月
正博 磯野
和久 竹田
洋司 笹井
Original Assignee
セイコーエプソン株式会社
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Priority to JP32783696 priority Critical
Priority to JP8-327836 priority
Priority to JP8-327837 priority
Priority to JP32783796 priority
Application filed by セイコーエプソン株式会社 filed Critical セイコーエプソン株式会社
Priority to JP26816297A priority patent/JP3712222B2/en
Publication of JPH10202916A publication Critical patent/JPH10202916A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus characterized by a mechanism that performs a recording head maintenance operation and a recording paper supply / discharge operation by a single drive motor.
[0002]
[Prior art]
Inkjet recording devices require a drive system that performs recording paper supply and discharge operations and recording head maintenance operations in addition to carriage travel operations. However, in small printers, the size and cost of the devices are reduced. In order to achieve this, a mechanism is adopted in which these paper supply / discharge operations and recording head maintenance operations are executed by a single drive motor.
[0003]
This type of mechanism is generally a switching mechanism that switches the driving force of the paper feed motor between the drive system of the pump and the drive system of the paper supply / discharge at each time when the carriage moves from the home position to the print area and from the print area to the home position. In addition, this switching mechanism employs a mechanism that selectively meshes the switching gear with the gears of the paper feed / discharge system and the pump system. In addition to the inconvenience that this may cause a deviation in the sheet feeding timing, this switching mechanism has a problem of requiring many members.
In addition, in an ink jet recording apparatus, it is necessary to dispose a cleaning mechanism for keeping the recording head in a good condition outside the recording writing area of the recording head, and the dimensions in the width direction are inevitably required. growing. In particular, in an ink jet recording apparatus that uses yellow, magenta, cyan, black, and two different shades of the same color for color printing, the recording head that ejects these inks as ink droplets is necessarily large. Thus, the capping unit and the cleaning mechanism configured in correlation with the size of the recording head inevitably increase in size.
As a result, if the carriage, recording head, capping unit, and cleaning mechanism are arranged with high density in the box in an attempt to reduce the size of the recording apparatus, the margin will be reduced. For example, the cleaner unit may become loose during play due to play or play. When the travel path is moved, there arises a problem that the carriage and the cleaner unit come into contact with each other to hinder recording writing.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and the object of the present invention is to smoothly apply driving force to the paper supply / discharge system and pump system without requiring a special mechanism for switching the driving force. An object of the present invention is to provide a device having a simple structure that can be switched and transmitted.
[0005]
[Means for Solving the Problems]
That is, in order to achieve the above-mentioned object, the present invention performs the recording paper feeding / discharging operation by rotating in one direction of a single driving means capable of switching the rotation direction between forward and reverse, and rotating in the other direction . The ink suction operation is selectively executed by the above-described driving and the recording paper supply / discharge means and the ink suction means are driven during the paper supply / discharge process from the start of the paper supply / discharge operation to the end of printing. The reversing operation of the means is coupled by a means for coupling by causing a time delay that can maintain the ink suction operation in an inoperative state.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, details of the present invention will be described below based on examples.
FIG. 1 shows an embodiment of the present invention. A carriage 1 is connected to a carriage motor 2 by a timing belt 3 and is configured to reciprocate in the width direction of the recording paper 4. 4 is provided with an ink jet recording head 5 for pressurizing ink by an actuator to eject ink droplets from a nozzle opening on the surface facing 4, and an ink cartridge 6 for supplying ink to the recording head 5 is detachably mounted on the upper surface. are doing.
[0008]
The recording paper 4 is fed in a direction perpendicular to the moving direction of the carriage 1 at a constant pitch by a transport roller 8 connected to a paper feed motor 7 via a power transmission mechanism described later. A capping unit 9 for sealing the recording head 5 is provided outside the printing area, and a cleaner unit 10 is provided on the printing area side of the capping unit 9.
[0009]
The capping unit 9 seals the recording head 5 during non-printing to prevent clogging of the nozzle openings, and receives negative pressure from the pump unit 11 to record when ink is filled or when clogging is eliminated. A function of forcibly ejecting ink from the head 5 is provided.
In addition, the code | symbol 12 in a figure shows a cut sheet feeder.
[0010]
FIGS. 2 and 3 show an embodiment of the above-described driving force transmission mechanism. The transport roller 8 has a gear 13 at one end, and the pinion 14 on the shaft of the paper feed motor 7 to the idler 15. The paper feed roller drive shaft 16 has a gear 17 at one end, engages with the gear 13 via a clutch mechanism 18 and transmits power to the cut sheet feeder 12, and further the pump unit 11 Is driven by a gear 22 provided at the other end of the paper discharge roller 21 from the pinion 14 of the paper feed motor 7 through the idler 19 and the paper discharge roller gear 20. The clutch mechanism 18 is configured to always hold a position away from the gears 13 and 17 as shown in FIG. 2 by a spring (not shown), and to connect the gears 13 and 17 when pushed by the carriage 1. Has been.
[0011]
Next, the configuration of each part will be described. The pump unit 11 is attached to the surface on the home position side of the pump frame 23 fixed in a direction orthogonal to the traveling direction of the carriage 1. A gear 26 that meshes with a gear 22 of a paper discharge roller 21 via an idler 25 is rotatably provided on the shaft 24 of the pump unit 11. The gear 26 has a cleaner cam 29 provided with an arm 28 that is pressed by a spring 27 and frictionally rotated on the back surface of the gear 26 so as to freely rotate. The arm 28 moves the cleaner unit 10.
[0012]
On the shaft 24 of the pump unit 11, a ratchet wheel 31, an intermediate transmission wheel 32, and a pump wheel 33 are stacked and loaded so that the intermediate transmission wheel 32 can freely rotate. The ratchet wheel 31 has protrusions 31 a on the surface facing the intermediate transmission wheel 32, the intermediate transmission wheel 32 has protrusions 32 a and 32 b on both surfaces, and the pump wheel 33 protrudes on the surface facing the intermediate transmission wheel 32. 33a is protrudingly provided.
[0013]
As a result, the ratchet wheel 31 is rotated and the projection 31 a is not transmitted to the intermediate transmission wheel 32 until it contacts the projection 32 a of the intermediate transmission wheel 32. Even if the protrusion 31 a of the ratchet wheel 31 contacts the protrusion 32 a of the intermediate transmission wheel 32, power is not transmitted to the pump wheel 33 until the protrusion 32 b contacts the protrusion 33 a of the pump wheel 33. That is, when the rotation direction of the paper feed motor 7 is switched, a rotation transmission delay of a maximum of about two rotations is provided between the ratchet wheel 31 and the pump wheel 33.
[0014]
As is well known, the pump wheel 33 is provided with two shaft holes 33b and 33b extending at one end in the center direction and at the other end in the outer circumferential direction. The tube 35 is connected to the pump casing by moving the rollers 34 and 34 pivotally supported in the shaft holes 33b and 33b in the outer circumferential direction or in the central direction, that is, by rotating the paper feed motor 7 forward or backward. 36 is configured to switch between a pumping action handled with 36 and a release action that does not pressurize the tube 35.
[0015]
The cleaner unit 10 is configured such that a groove 38 is formed on the upper surface of the cleaner holder 37, and a cleaning blade 39 is inserted in such a height that the tip can be elastically contacted with the nozzle plate of the recording head 5. The cleaner holder 37 has a guide protrusion 40 formed on a side thereof engaged with a guide groove 42 extending in a direction perpendicular to the moving direction of the carriage 1 on the upper part of the pump casing 36 and extending in the vertical direction at the tip. The hole 43 is engaged with the protrusion 28 a of the arm 28 of the cleaner cam 29. Further, the cleaner holder 37 is formed with a locking projection 44 that engages with a carriage stopper 1 a provided on the side surface of the carriage 1 between the cleaning blade 39 and the guide projection 40.
[0016]
As a result, when the cleaner cam 29 is rotated, the guide groove 40 is reciprocally moved. When the cleaner cam 29 is moved from the retracted position to the cleaning position, that is, from the right end position in the drawing into the traveling region of the carriage 1, the cleaning blade 39 is elastically applied to the recording head 5. The nozzle surface is contacted and wiped off, and the movement of the cap 80, which will be described later, in the direction of the starting end is suppressed.
[0017]
4 and 5 show an embodiment of the capping unit 9. The cap frame 51 has two locking protrusions 52 and 52 protruding at one end, and the locking hole of the pump frame 23 described above. By being engaged with 23b, 23b, the longitudinal direction of the carriage 1 is directed toward the traveling direction.
[0018]
The cap frame 51 has cam grooves 53 formed on both sides thereof, which are an upward inclined portion 53a and a horizontal portion 53b extending from the start end side to the end end side of the home position, that is, from left to right in FIG. 53 are provided on both sides, and a protrusion 57 of a slider 56 is slidably attached thereto.
[0019]
The slider 56 has a contact piece 56a that contacts the carriage 1 on the terminal end side, and a distance Ls corresponding to the length Lc in the longitudinal direction of the cap 80 from the contact piece 56a as shown in FIG. A holder receiving portion for supporting the cap 80 is formed at a separated position. The slider 56 includes guide pieces 56b and 56b for guiding the recording head 5 on both sides, the end portion side is supported by the cam groove 53 of the cap frame 51 by the projection 57, and the start end side is supported by the spring 58 on the end portion side. Is held by a lever 59 that constitutes a link that receives a rotational biasing force.
[0020]
As shown in FIG. 6 (a), the protrusion 57 is formed at a position that is substantially the same height (ΔH≈0) as the sealing surface 80a of the cap 80, and as shown in FIG. As described above, when the slider 56 is moved to the capping position and the recording head 1 is sealed, the shift amount ΔL1 when the slider 56 is rotated around the projection 57 can be minimized. Compared to this, when formed at a different position (57 ′), the shift amount ΔL2 becomes large, and it is difficult to obtain a reliable seal.
[0021]
The lever 59 supporting the lower portion of the slider 56 is set so that its arm length, that is, the lift amount ΔH1 is larger than the lift amount ΔH2 of the inclined portion 53a of the cam groove 53, as shown in FIG. ing. In addition, the load at the time of capping can be made small by making the inclination part 53a approach horizontal. As a result, the current for driving the carriage motor 2 can be suppressed to reduce the impact on the carriage 1, and troubles such as missing dots due to meniscus destruction of the recording head 5 can be prevented to ensure high reliability. Further, the length of the lever 59 can be shortened by the amount of the load at the time of capping, and the amount of movement in the horizontal direction due to the amount of rotation can be suppressed, and the overall size of the capping device can be suppressed.
[0022]
The slider 56 engages with the tip of the lever 59 through an engagement hole 60 having a length L formed in a lower portion thereof, and the degree of freedom of the length L of the engagement hole 60 (FIG. 6 (A)). Are connected to each other, and are configured to be drawn toward the starting end side, that is, the lower end side of the inclined portion 53a while maintaining the non-capping state.
[0023]
Thereby, under the non-capping state, the lowest region is moved to a position overlapping with the operation region of the cleaner unit 10, and the contact surface 63 b of the cap holder 63 is moved to the region facing the tip surface of the cleaner unit 10. Displacement prevents the cleaner unit 10 from protruding into the moving area of the carriage 1. As a result, the capping unit 9 can be disposed as close as possible to the recording paper 4 side of the movement path of the carriage 1 as much as possible, that is, without requiring a large safety tolerance. It is possible to reduce the width dimension.
[0024]
The slider 56 has spring receiving seats 62 and 62 formed on the upper surface thereof so as to be distributed to the left and right and in the moving direction of the carriage 1 so that the center line in the longitudinal direction and the short direction of the cap 80 is a symmetric line. In addition, protrusions 65 and 65 ′ that engage with the grooves 64 and 64 ′ of the cap holder 63 are formed on both sides on the start end side, and further, engage with the protrusion 66 of the cap holder 63 on the center line on the end side. A groove 67 is formed.
[0025]
The cap holder 63 has spring receiving portions 68 and 68 extending so as to protrude on both sides of the cap holder 63, and spring receiving seats 69 and 69 are formed dispersed in the moving direction of the carriage 1. Grooves 64 and 64 'for engaging with the protrusions 65 and 65' of the slider 56 are formed, and a protrusion 66 for engaging with the groove 67 of the slider is formed on the center line on the end side.
[0026]
Then, one of the grooves 64, 64 ′, for example, the bottom surface of the groove 64 ′ is slightly higher than the other groove 64, or one of the protrusions 65, 65 ′, for example, 65 ′ is the groove 64 ′ than the other protrusion 65. It is formed so that the surface which opposes may protrude.
[0027]
With such a configuration, the cap holder 63 has its grooves 64 and 64 ′ engaged with the protrusions 65 and 65 ′ of the slider 56, and the protrusion 66 is engaged with the groove 67 of the slider 56. When the compression spring 70 is inserted and biased upward, the slider 56 is supported at three points in a posture in which one side of the start end portion is slightly lowered. Specifically, it is set so that the inclination with respect to the nozzle surface of the recording head 5 is 1 degree or more, or 2 degrees or more.
[0028]
Further, since the cap holder 63 is supported at three points, the positioning height of the sealing surface of the cap 80 accommodated therein can be adjusted more accurately. Further, when the cap 80 is moved away from the recording head 5, a peeling force is applied with the outer side of the cap 80 as a fulcrum to amplify the moment, for example, when the cap 80 adheres to the recording head 5 due to solidification of ink or the like. But it can be pulled apart easily.
[0029]
Since the cap holder 63 is thus elastically pressed toward the recording head 5 by the compression springs 70 on both sides outside the sealing area, the compression force by the compression springs 70 on both sides is applied as shown in FIG. When the distance from PA, Pb, spring 70 to the sealing point of cap 80 is La, Lb, the distance between the sealing points, that is, the width W of cap 80, reaction force Ra, Rb of each sealing point is Ra = {Pa (W + La) −Pb · Lb} / W
Rb = {Pb (W + Lb) −Pa · La} / W
It becomes.
And in order to make the adhesiveness with the recording head 5 constant, it is necessary to make the reaction forces Ra and Rb the same at each sealing point.
{Pa (W + La) −Pb · Lb} = {Pb (W + Lb) −Pa · La}
Pa (W + 2La) = Pb (W + 2Lb)
That is, Pa = Pb
La = Lb
Need to be satisfied.
That is, the same load may be used for the compression springs 70 on both sides, and these springs 70 may be arranged at positions symmetrical with respect to the cap 80.
[0030]
On the other hand, the cap holder 63 changes the height of one of the grooves 64 and 64 ′ or the thickness of one of the protrusions 65 and 65 ′ so that one side of the start end side is slightly lower, so that the cap 80 However, at the time when the close contact with the recording head 5 is started, the load is unbalanced.
That is, as shown in FIG. 8B, the reaction forces Ra and Rd of the supporting points A and D are respectively Ra = {Pa (W ′ + La) −Pb · Lb ′} / W ′.
Rd = {Pb (W ′ + Lb ′) − Pa · La} / W ′
It becomes.
Since the loads Pa and Pb are set to the same value as described above,
Ra = Pa + {Pa (La−Lb ′)} / W ′
Rd = Pa + {Pa (Lb′−La)} / W ′
Since La> Lb ′, naturally, {Pa (La−Lb ′)} / W ′> 0, and therefore Ra = Pa + {Pa (La−Lb ′)} / W ′> Pa.
It becomes.
[0031]
That is, when the cap 80 starts to come into close contact with the recording head 5, a load larger than the load Pa by the spring 70 itself by {Pa (La−Lb ′)} / W ′ acts on the contact point. Increases core and adhesion.
In order to increase the incremental load {Pa (La−Lb ′)} / W ′ at the initial contact, W ′ and Lb may be decreased and La may be increased, but W ′ is the size of the cap 80. Therefore, it is a realistic method to increase La and decrease Lb ′.
[0032]
FIG. 8 (c) shows the distance between the cap and the recording head between the cap of the present invention and a conventional cap that holds the cap with two springs located at the center line inside the sealing area of the cap. This shows the relationship with the load acting on the recording head. In the present invention shown by the solid line (A), a sufficient load can be applied at the initial stage of contact, whereas in the conventional one, a dotted line ( As shown in B), the contact load is applied for the first time just before contact with the entire surface.
[0033]
The cap holder 63 has two protrusions 71 planted on the center line of the bottom surface 63a, and two cylindrical bodies 72 and 73 are formed on the start end side so as to be symmetrical with respect to the center line. The cylindrical body 73 is vertically extended to the tube 35 of the pump unit 11, and the cylindrical body 72 is extended to the outside and parallel to the bottom surface and bent toward the terminal end side to be described later via the tube 74. The seat 75 is connected.
[0034]
In this way, the tubes 35 and 74 are attached as close as possible to the center line of the cap 80, and are arranged perpendicular to the cap and parallel to the moving direction, so that the bending moment acting on the cap 80 is as much as possible. It becomes possible to reduce.
[0035]
The valve seat 75 is fixed to the end portion of the slider 56, and the valve 77 is fixed to the valve seat 75. The operating rod 79 is in contact with an abutting piece 76 provided on the cap frame 51 so as to be slidable in the carriage moving direction, and in a state of being biased by a spring 78, the valve 77 always keeps the closed position. 77 is attached to a slider 56 at a position opposite to 77.
[0036]
The cap holder 63 holds a cap 80 formed of an elastic member such as rubber having ink resistance inside by a concave portion 81, 82, a protrusion 71, and a claw 83 formed in the cap 80.
[0037]
The cap 80 has recesses 84 and 85 communicating with the cylindrical bodies 72 and 73 on the bottom surface, and holds the two ink absorbing sheets 86 and 87 made of a porous material having ink resistance with the claws 88. are doing.
[0038]
FIG. 9 shows an embodiment of the cut sheet feeder 12 with its paper feed mechanism, which is composed of a hopper 90, a separation pad 94, and a paper feed roller 100.
The hopper 90 is urged toward the paper feed roller by a spring 92 interposed between the lower back surface and the frame 91, and the lower surface facing the paper feed roller 100 is biased by a spring 93 to the paper feed roller 100. A separation pad 94 urged in the normal direction is provided. The separation pad 94 is configured to move up and down in accordance with the sheet feeding operation during one rotation of the sheet feeding roller 100 by a cam (not shown) provided on the sheet feeding roller drive shaft 16.
[0039]
The paper feed roller 100 has a circular arc part 100a and a straight line part 100b, and is formed as a D-shaped roller so as to generate a high frictional force with the recording paper. It is attached to the drive shaft 16 and is configured to rotate once by a paper feed motor 7 via a gear 17 during a paper feeding operation.
[0040]
The bush 101 is configured such that a cam surface 102 is formed so as to exclude a region facing the linear portion 100 b of the paper feed roller 100 across the central axis, and the idle roller 103 is moved on the cam surface 102.
[0041]
The idle roller 103 is rotatably held by a shaft 105 that can move in a long hole 104 on the frame 91, and is attached to the separation pad 94 so as to be vertically movable.
[0042]
With such a configuration, when the paper feed roller 100 is rotated counterclockwise by a predetermined angle, the dividing pad 94 is separated from the paper feed hopper 100 by a cam mechanism (not shown), and the recording paper is moved to the hopper 90 by a paper return lever (not shown). Pushed back. At substantially the same time as the recording sheet is returned to the hopper 90, the separation pad 94 is pressed against the sheet feeding hopper 100.
[0043]
Next, when the paper feed roller 100 rotates clockwise, the hopper 90 is momentarily pushed up by the spring 92, the paper P is also pushed up, and the arc portion 100a of the paper feed roller 100 is pressed against the paper on the front surface.
When the sheet feeding roller 100 continues to rotate, the sheet is fed toward the separation pad 94. In this way, the recording sheet is sent to the separation pad 94 by the rotation of the arc portion 100 a, and one sheet is separated from the plurality of recording sheets by the separation pad 94 and further sent to the transport roller 8. At this time, since the arc portion 100a of the paper feed roller 100 passes through the separation pad 94 and the linear portion 100b is opposed, the idle roller 103 engaged with the cam surface 102 presses the recording paper against the separation pad 94. Further, it is possible to prevent a plurality of non-separated recording sheets from being excessively fed to the conveying roller 8.
[0044]
When the paper feed roller 100 further rotates one time, the original state is reset to prepare for the next paper feed.
[0045]
Next, the operation of the apparatus configured as described above will be described based on the flowcharts shown in FIGS.
During the rest, as shown in FIG. 10, since the locking projection 44 of the cleaner unit 10 engages the carriage stopper 1a and the carriage 1 is locked, the paper feed motor 7 is rotated in the forward direction as shown in FIG. As shown, the cleaner unit 10 is retracted from the recording head 5 to release the carriage lock (step (a) in FIG. 20).
[0046]
As a result, the carriage 1 can move, so that the carriage 1 is slightly moved in the direction of the starting end to form a gap ΔG between the recording head 5 and the cap 80 as shown in FIG. 12 (step (b) in FIG. 20). In this state, a flushing signal is supplied to the recording head 5 to eject ink droplets from the nozzles to the cap 80 (step (c) in FIG. 20). In this state, since the surface of the cap 80 is inclined at an angle θ with respect to the nozzle surface of the recording head 5, it is possible to prevent the ink splash bounced off from the ink absorbing sheet 86 from adhering to the nozzle surface as much as possible. . Incidentally, slight movement of the paper end direction of the carriage, to be done by a length L min of the engaging hole 60 of the lever 59, since the lever 59 to maintain the crop failure dynamic state, if the carriage 1 is the slider 56 Even if it abuts, the impact on the carriage 1 can be reduced as much as possible, damage to the meniscus of the recording head 5 can be prevented, and printing with high reliability can be ensured.
[0047]
Next, the carriage 1 is moved to the end opposite to the home position, and the gear 13 and the gear 17 of the paper feed roller drive shaft 16 are engaged by the clutch mechanism 18 (step (d) in FIG. 20). Is reversed slightly, and the auto sheet feeder 12 performs a paper returning operation (step (e) in FIG. 20). Since the ratchet wheel 31 is delayed in transmission by the intermediate transmission wheel 32 adjacent to the protrusion 31a, transmission of the driving force to the pump wheel 33 is cut off, and the paper feed motor 7 is cut without applying unnecessary load. A paper return operation in the sheet feeder 12 is executed.
[0048]
Next, when the paper feed motor 7 is rotated forward, the paper feed roller 100 rotates forward and transports the recording paper to the biting area of the transport roller 8 (step (f) in FIG. 20). Next, the carriage 1 is moved to the home position side to disengage the gear 13 by the clutch mechanism 18 and the gear 17 of the paper feed roller drive shaft 16 (step (g) in FIG. 20), and the paper feed motor 7 is reversed. The recording paper is discharged from the conveying roller 8 to eliminate the paper skew (step (H) in FIG. 20).
[0049]
The carriage 1 is moved to a position where the clutch mechanism 18 can be engaged, and the gear 13 and the gear 17 of the paper feed roller drive shaft 16 are engaged (step (FIG. 20) in FIG. 20), and the paper feed motor 7 is rotated forward. Then, the recording sheet is conveyed by the conveying roller 8 and the cut sheet feeder 12 is reset (step (n) in FIG. 20). Next, the carriage 1 is moved to the home position side to disengage the gear 13 by the clutch mechanism 18 from the gear 17 of the paper feed roller drive shaft 16 (step (l) in FIG. 20), and the paper feed motor 7 is reversed. Then, the leading edge of the paper is positioned at a predetermined position by the transport roller 8 (step (W) in FIG. 20), and the paper feed motor 7 is rotated forward to execute paper positioning and backlash removal (FIG. 20). Step (W)), the printing operation is started (Step (F) in FIG. 20).
[0050]
The forward rotation and the reverse rotation of the paper feed motor 7 have a small amount of rotation, and since the forward rotation and the reverse rotation are alternately repeated, the pump unit 11 is maintained in an inoperative state due to the transmission delay action of the intermediate transmission wheel 32. Thus, only the load necessary for transporting the paper acts on the paper feed motor 7.
[0051]
When the paper is set in this way and printing is started, each time the recording head 5 finishes printing one line, the paper feed motor 7 rotates forward to execute one line of paper feed. Although the transmission delay due to the intermediate transmission wheel 32 does not function due to the subsequent forward rotation of the paper feed motor 7, the pump unit 11 does not function as a pump because the roller 34 is rotated toward the center, and therefore does not function as a paper. No unnecessary load is applied to the feed motor 7.
[0052]
Under the condition that the paper feed motor 7 rotates in the forward direction and the carriage 1 reciprocates in the printing area and the recording head 5 performs printing, the cleaner unit 10 is reset as shown in FIG. Since the slider 56 of the capping unit 9 is positioned below by the lever 59 that receives the urging force of the spring 58, the recording head 5 is located at the retracted position outside the travel area of the recording head 5. Even when they move above the cap 80, they do not contact each other.
[0053]
Further, due to the urging force of the return spring 61, the lever 59 has moved to the printing area side by an amount corresponding to the length L of the engagement hole 60, and the contact surface 63 b of the cap holder 63 faces the cleaner unit 10. Yes. Thereby, even if the paper feed motor 7 rotates in the reverse direction, that is, in the direction in which the cleaner unit 10 is pushed out to the travel region of the recording head 5, the cap holder 63 enters the travel region of the recording head 5. Therefore, it is possible to prevent a situation in which the recording operation is hindered.
[0054]
When the recording operation is completed, the carriage 1 is moved to the home position by the carriage motor 2. In the course of this movement, as shown in FIG. 14, the carriage 1 contacts the contact piece 56 a of the slider 56, and the slider 56 is rotated against the return spring 61 and the lever 59 is rotated against the spring 58. While moving toward the end.
[0055]
In this movement process, the lever 59 rises with the movement of the carriage 1, and the projection 57 of the slider 56 moves on the slope portion 53 a of the cam groove 53. When the projection 57 of the slider 56 pushed by the carriage 1 is further moved to the horizontal portion 53b of the cam groove 53, the cap holder 63 is in a posture in which one side of the start end side is slightly lowered in the process. Thus, the cap 80 first contacts one end of the cap 80 with the nozzle surface of the recording head 5 by the compression force of the entire compression spring 70. Then, as shown in FIG. 15, when the slider 56 moves to the terminal end, the entire circumference of the cap 80 receives the compressive force of the full compression spring 70 and comes into contact with the nozzle surface of the recording head 5 to ensure sealing. .
[0056]
In the process from the initial contact to the entire sealing, the protrusion 57 is located at substantially the same height (ΔH≈0) as the sealing surface 80a of the cap 80, and as shown in FIG. When the slider 56 moves to the capping position, the amount of deviation ΔL1 when rotating around the projection 57 is extremely small and surely contacts the nozzle surface of the recording head 5 to ensure sealing.
[0057]
In this sealed state, the contact surface 63b of the cap holder 63 is retracted from the path of the cleaner unit 10, so that when the paper feed motor 7 is reversed, the cleaner cam 29 rotated in the counterclockwise direction in FIG. The cleaner unit 10 is caused to project into the running area of the recording head 5 by the arm 28. When it is rotated in the reverse direction to a position before the position where the cleaning operation is possible, the locking projection 44 of the cleaner unit 10 engages with the carriage stopper 1a to lock the carriage 1 as shown in FIG. To prevent slow movement.
[0058]
When the recording head 1 is clogged due to long-time printing or the like, cleaning is necessary.
From the sealed state shown in FIG. 10, the paper feed motor 7 is rotated forward to discharge the recording paper, and the cleaner unit 10 is retracted from the recording head 5 as shown in FIG. 21 Step (A)). Accordingly, the carriage 1 can be moved. Therefore, when the carriage 1 is further moved to the end side from the capping state shown in FIG. 15 to the position shown in FIG. 16, the operating rod 79 provided on the slider 56 is moved to the cap frame. The valve 77 of the valve seat 75 is opened to the atmosphere by contacting with the contact piece 76 of 51 (step (b) in FIG. 21).
[0059]
When the paper feed motor 7 is reversed in this state, the cleaner unit 10 protrudes on the travel path of the recording head 5 and is set at a position where the cleaner unit 10 can be cleaned as shown in FIG. (C)). Of course, since the paper feed motor 7 is reverse rotation after normal rotation, the reverse rotation of the paper feed motor 7 is not transmitted to the pump wheel 33 by the intermediate transmission wheel 32, and the pump unit 11 maintains the inoperative state.
[0060]
Next, when the carriage 1 is moved to the start end side, the cleaning blade 39 comes into contact with the nozzle surface of the recording head 5 as shown in FIG. 18, so that the carriage 1 is attached to the nozzle surface by moving to the wiping end position. The ink being wiped is wiped off (step (d) in FIG. 21). At this time, since the cleaning blade 39 is in contact with the cap holder 63, the ink adhering to the cleaning blade 39 due to wiping moves to the cap holder 63 or the cap 80. Therefore, the ink remaining amount of the cleaning blade 39 is reduced. It can be kept as small as possible, and the reliability of the wiping operation can be ensured.
[0061]
When the cleaning is completed, the paper feed motor 7 is rotated forward by the same amount as the reverse rotation, and the cleaner unit 10 is returned to the retracted position as shown in FIG. 19 (step (e) in FIG. 21), and the carriage 1 is moved. Moving to the idle suction position, the slider 56 is moved and displaced to the end, and the recording head 5 is set to the idle suction enabled state shown in FIG. 16 (step (f) in FIG. 21).
[0062]
The paper feed motor 7 is rotated by the transmission delay by the intermediate transmission wheel 32 (step (g) in FIG. 21), and the carriage 1 is slightly moved to the start end side to bring the recording head 1 into the sealed state shown in FIG. Set (step (H) in FIG. 21). As a result, the slider 56 is separated from the end portion, so that the operating rod 79 on the slider 56 is separated from the contact piece 76 of the cap frame 51 and is closed by the valve 77 by the biasing force of the spring 78.
[0063]
When the paper feed motor 7 is reversed in this state, power is transmitted to the pump unit 9, suction force acts on the cap 80, ink is sucked from the recording head 5 with a strong pressure, and is forcibly discharged. The clogging is eliminated and the recording head 5 is restored to the normal state (FIG. 21 step (re)).
[0064]
The carriage 1 is moved and displaced slightly to the end portion, and the recording head 5 is set at the idle suction position shown in FIG. 16 (step (N) in FIG. 21). Without applying an unnecessary suction force, only the ink remaining in the cap 80 is sucked and discharged into a waste ink tank (not shown) (step (l) in FIG. 21).
[0065]
When the idle suction is completed, the cleaner unit 10 is set at the position shown in FIG. 17, so the paper feed motor 7 is rotated forward to retract the cleaner unit 10 (step (W) in FIG. 21), and the carriage 1 is moved to the wiping end position (step (W) in FIG. 21).
[0066]
At the stage when the cleaning operation is completed, the paper feed motor 7 is reversed to eliminate the transmission delay caused by the intermediate transmission wheel 32 caused by the previous forward rotation (step (f) in FIG. 21), and the pump unit 11 is operated. The ink remaining in the cap 80 is sucked with a strong suction force without applying a suction force to the recording head 5 (step (Y) in FIG. 21).
[0067]
Next, the paper feed motor 7 is rotated forward to retract the cleaner unit 10 from the travel path of the recording head 5 as shown in FIG. 16 (step (T) in FIG. 21). Then, the carriage 1 is moved again toward the end portion, and the recording head 5 is sealed in the idle suction state by the cap 80 as shown in FIG. 16 (step (l) in FIG. 21). Of course, since the cleaner unit 10 is retracted from the traveling path of the recording head 5, the cleaning blade 39 does not contact the nozzle surface of the recording head 5.
[0068]
The paper feed motor 7 is reversed to eliminate the transmission delay caused by the intermediate transmission wheel 32 (step (FIG. 21) in FIG. 21), and the carriage 1 is slightly moved to the start end side to close the recording head 1 as shown in FIG. Set to a stop state (FIG. 21 step (tsu)). As a result, the slider 56 is separated from the end portion and the valve 77 is closed by the operating rod 79.
[0069]
When the paper feed motor 7 is reversed at a low speed in this state, power is transmitted to the pump unit 9, a weak suction force acts on the cap 80, and the ink is forcibly discharged from the recording head 5 with a weak suction force. The meniscus is recovered (step (b) in FIG. 22).
[0070]
After completion of the suction, the carriage 1 is moved slightly to the end portion and the recording head 5 is set to the idle suction state shown in FIG. 16 (step (b) in FIG. 22), the paper feed motor 7 is reversed at a low speed, and the recording head 5, a suction force that does not cause ink discharge is applied to suck only the ink remaining in the cap 80 and discharge it to a waste ink tank (not shown) (step (c) in FIG. 22).
[0071]
When the idle suction is completed, the cleaner unit 10 is already set as shown in FIG. 17 by reversing the above-mentioned step (c), so the carriage 1 is moved to the wiping end position as shown in FIG. Then, wiping is performed (step (d) in FIG. 22).
[0072]
When the paper feed motor 7 is reversed at the stage when the cleaning operation is completed, the pump unit 11 is operated without causing a transmission delay by the intermediate transmission wheel 32 because the reverse rotation is continued from the previous time, and the cap 80 is connected to the recording head 5. The ink remaining without being sealed is sucked with a strong negative pressure (step (e) in FIG. 22).
[0073]
The paper feed motor 7 is rotated forward within the transmission delay by the intermediate transmission wheel 32, and the cleaner unit 10 is retracted from the travel path of the recording head 5 as shown in FIG. 19 (step (f) in FIG. 22). Then, the carriage 1 is moved again toward the end portion, and the recording head 5 is sealed in the idle suction state by the cap 80 as shown in FIG. 16 (step (G) in FIG. 22). Of course, since the cleaner unit 10 is retracted from the traveling path of the recording head 5, the cleaning blade 39 does not contact the nozzle surface of the recording head 5.
[0074]
The paper feed motor 7 is reversely rotated to eliminate the transmission delay caused by the intermediate transmission wheel 32 due to the previous forward rotation (step (H) in FIG. 22), and the carriage 1 is moved slightly to the start end side to show the recording head 1. The valve seat 77 is closed by setting the sealed state shown in FIG. 15 (step (I) in FIG. 22).
[0075]
When the paper feed motor 7 is reversed at a low speed in this state, power is transmitted to the pump unit 9, a weak suction force acts on the cap 80, and the ink is forcibly discharged from the recording head 5 with a weak suction force. The meniscus is recovered (Step 22 in FIG. 22).
[0076]
After the completion of suction, the carriage 1 is moved and displaced slightly to the end portion, and the recording head 5 is set to the idle suction state shown in FIG. 16 (Step (L) in FIG. 22), and the paper feed motor 7 is reversed at low speed. Only the ink remaining in the cap 80 is sucked with a suction force that does not cause ink discharge from the recording head 5 (step (W) in FIG. 22).
[0077]
At the stage where the idle suction is completed, the cleaner is already set as shown in FIG. 17 by the reverse rotation of the paper feed motor 7 in the above step (W), so the carriage 1 is moved to the wiping end position shown in FIG. As a result, the recording head 5 is wiped (step (W) in FIG. 22).
[0078]
When the paper feed motor 7 is reversed at the stage when the cleaning operation is completed, the pump unit 11 is operated and released from the recording head 5 without causing a transmission delay due to the intermediate transmission wheel 32 because the reverse rotation follows the previous time. The ink remaining in the cap 80 in the state is sucked with a strong suction force, and the ink in the cap 80 is surely discharged to the waste ink tank (step (f) in FIG. 22).
[0079]
When the paper feed motor 7 is rotated in the forward direction until the protrusion 32b of the intermediate transmission wheel 32 contacts the protrusion 33a of the pump wheel 33 and the pump wheel 33 is slightly rotated, the cleaner unit 11 is reset, and the pump unit 11 roller 34 moves in the center direction and is separated from the tube 35, and the pump unit 11 is set in the released state (step (Y) in FIG. 22).
[0080]
When all the cleaning steps are completed, the carriage 1 is moved to the home position to be in the state shown in FIG. 15, so that the entire circumference of the cap 80 receives the compressive force of the full compression spring 70 and the nozzles of the recording head 5. As shown in FIG. 10, the sheet is securely sealed by contacting the surface (FIG. 22 step (t)), the flushing operation is suspended (FIG. 22 step (re)), and the paper feed motor 7 is reversed. The locking projection 44 of the cleaner unit 10 is engaged with the carriage stopper 1a to lock the carriage 1 and prevent unnecessary movement of the carriage 1 (step (S) in FIG. 22).
[0081]
【The invention's effect】
As described above, according to the present invention, the discharge operation of the paper supply / discharge unit and the ink suction operation are performed under the reverse rotation direction of the drive unit, so that the ink suction operation during the recording / writing operation is performed. It is possible to accurately perform the paper supply / discharge operation without being affected by the load fluctuation accompanying the ink suction , while making sure that it is impossible and using the delay in the transmission of the driving force to the ink suction means.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an ink jet recording apparatus according to the present invention.
FIG. 2 is a diagram showing a drive power transmission system of the recording apparatus.
FIG. 3 is an exploded perspective view of a pump unit in the apparatus.
FIGS. 4A and 4B are perspective views showing an embodiment of a capping unit used in the apparatus as seen from both sides.
FIG. 5 is an exploded perspective view showing an embodiment of a capping unit used in the apparatus.
FIGS. 6A to 6C are diagrams for explaining the sizes of the slider and the cap frame, respectively, and for explaining the shift amount at the time of capping.
FIGS. 7A to 7C are respectively a top view showing an embodiment of a cap holder with a cap inserted, a cross-sectional view showing a cap removed, and an embodiment of a cap. FIG.
FIG. 8A is an explanatory diagram showing a load acting on the cap, FIG. 8B is an explanatory diagram showing a load in the initial contact with the recording head, and FIG. And a diagram showing the relationship between the distance between the cap and the recording head and the load acting on the recording head, with the cap held by two springs located on the center line inside the sealing area of the cap. is there.
FIG. 9 is a cross-sectional view illustrating an embodiment of a sheet feeding mechanism of a cut sheet feeder.
FIGS. 10A and 10B are views showing the state in which the carriage is locked by the cleaner unit from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIGS. 11A and 11B are views showing a state in which the carriage is unlocked from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIGS. 12A and 12B are views showing the flushing state from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIGS. 13A and 13B are views showing a state in which the cleaner unit is locked from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIGS. 14A and 14B are views showing the process of raising the slider by the carriage from the plane and the side in the operations of the cleaner unit and the capping unit, respectively.
FIGS. 15A and 15B are views showing the sealing state of the recording head from the plane and the side in the operations of the cleaner unit and the capping unit, respectively.
FIGS. 16A and 16B are views showing the idle suction state from the plane and side surfaces, respectively, of the operations of the cleaner unit and the capping unit.
FIGS. 17A and 17B are views showing a state in which the cleaner unit is set in a cleanable state from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIGS. 18A and 18B are views showing the cleaning state from the plane and the side, respectively, of the operations of the cleaner unit and the capping unit.
FIGS. 19A and 19B are views showing the state in which the cleaner unit is reset after cleaning, from the plane and the side, among the operations of the cleaner unit and the capping unit, respectively.
FIG. 20 is a flowchart showing a printing operation of the apparatus.
FIG. 21 is a flowchart showing the first half of the cleaning operation of the apparatus.
FIG. 22 is a flowchart showing the latter half of the cleaning operation of the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carriage 2 Carriage motor 5 Recording head 6 Ink cartridge 7 Paper feed motor 8 Conveyance roller 9 Capping unit 10 Cleaner unit 11 Pump unit 12 Cut sheet feeder 13, 17, 22, 26 Gear 14 Pinion 16 Paper feed roller drive shaft 18 Clutch mechanism 21 discharge roller 28 arm 29 cleaner cam 31 ratchet wheel 32 intermediate transmission wheel 33 pump wheel 34 roller 35 tube 36 pump casing 37 cleaner holder 38, 64, 64 ', 67 groove 39 cleaning blade 40 guide projection 42 guide groove 43 elongated hole 44 Locking projection 51 Cap frame 53 Cam groove 53a Inclined portion 53b Horizontal portion 56 Slider 56a Contact piece 59 Lever 60 Engagement hole 63 Cap holder 68 Spring receiving portion 70 Spring 74 Tube 75 Valve seat 77 Valve 80 Cap 86, 87 Ink absorbing sheet 90 Hopper 91 Frame 94 Separation pad 100 Paper feed roller

Claims (5)

  1. Rotation by the paper discharging operation of the recording paper to the rotational direction to one direction of forward and reverse switchable single drive means and causes to execute the ink suction operation selectively by rotation to the other direction, the recording The paper suction / discharge means and the ink suction means perform the ink suction operation with respect to the reverse operation of the drive means executed during the paper supply / discharge process from the start of the paper supply / discharge operation to the end of printing. An ink jet recording apparatus which is coupled by means for coupling by causing a time delay that can be maintained in an inoperative state.
  2. As the means for coupling with a time delay when switching the rotation direction, the rotation drive body and the rotation driven body are disposed so as to be freely rotatable, and are provided on the rotation driving body and the rotation driven body. The ink jet recording apparatus according to claim 1, wherein the protrusion is in contact with each protrusion and is an intermediate transmission rotating body provided on both front and back surfaces.
  3. 2. The ink jet recording apparatus according to claim 1, wherein a cleaning unit is coupled to the driving unit so that a cleaning operation is performed under the ink suction operation of the driving unit.
  4. The ink jet recording apparatus according to claim 1, wherein the ink suction unit is directly connected to the driving unit by a transmission mechanism different from the paper supply / discharge unit.
  5. 4. The ink jet recording apparatus according to claim 3, wherein the cleaning unit is directly connected to the driving unit by a transmission mechanism different from the paper supply / discharge unit.
JP26816297A 1996-11-22 1997-09-12 Inkjet recording device Expired - Fee Related JP3712222B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP32783696 1996-11-22
JP8-327836 1996-11-22
JP8-327837 1996-11-22
JP32783796 1996-11-22
JP26816297A JP3712222B2 (en) 1996-11-22 1997-09-12 Inkjet recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26816297A JP3712222B2 (en) 1996-11-22 1997-09-12 Inkjet recording device

Publications (2)

Publication Number Publication Date
JPH10202916A JPH10202916A (en) 1998-08-04
JP3712222B2 true JP3712222B2 (en) 2005-11-02

Family

ID=27335617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26816297A Expired - Fee Related JP3712222B2 (en) 1996-11-22 1997-09-12 Inkjet recording device

Country Status (1)

Country Link
JP (1) JP3712222B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006305785A (en) * 2005-04-26 2006-11-09 Seiko Epson Corp Wiping device and liquid jet device
US7530664B2 (en) 2005-09-29 2009-05-12 Seiko Epson Corporation Maintenance device for liquid-ejecting apparatus and liquid-ejecting apparatus
JP4848720B2 (en) * 2005-09-29 2011-12-28 セイコーエプソン株式会社 Maintenance device and liquid ejecting apparatus in liquid ejecting apparatus
JP4899399B2 (en) * 2005-09-29 2012-03-21 セイコーエプソン株式会社 Cleaning device and liquid ejecting apparatus in liquid ejecting apparatus
JP2009196291A (en) * 2008-02-25 2009-09-03 Seiko Epson Corp Nozzle inspecting device in fluid ejector, fluid ejector and nozzle inspection method
JP5375451B2 (en) * 2009-08-31 2013-12-25 ブラザー工業株式会社 Image recording device
JP5375484B2 (en) * 2009-09-24 2013-12-25 ブラザー工業株式会社 Inkjet recording device
JP5742904B2 (en) * 2013-09-26 2015-07-01 ブラザー工業株式会社 Image recording device

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