JP4120756B2 - Belt tension applying device and recording apparatus provided with the belt tension applying device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt tension applying device that applies a predetermined tension to an endless belt that is engaged with a drive shaft of a drive motor and at least two or more rotation shafts. The present invention also relates to a recording apparatus that performs recording on a recording material, including the belt tension applying device.
[0002]
[Prior art]
The endless belt that transmits the power of the drive motor to the plurality of rotation shafts by being engaged with the drive shaft of the drive motor and the plurality of rotation shafts has a poor power transmission depending on the tension state, in particular, high speed. Since the stability during operation is determined, it is desirable that an appropriate tension is applied to the endless belt. Therefore, in order to appropriately maintain the tension state of the endless belt, for example, there may be used a configuration in which a driven roller for tension adjustment is provided between any two rotating shafts and the tension is adjusted by the driven roller.
[0003]
More specifically, the driven roller is provided so as to be displaceable in a tension increasing direction and a decreasing direction, and is always biased in the tension increasing direction by a biasing means (for example, a spring). Therefore, the endless belt is operated in a state where the tension of the endless belt and the urging force of the urging means are balanced by the driven roller configured as described above.
[0004]
[Problems to be solved by the invention]
However, when the driven roller as described above is provided, the driven roller can be displaced in the tension increasing direction and the decreasing direction, so that the belt drive state may become unstable during high-speed operation. Providing the driven roller increases the cost.
[0005]
Therefore, the present invention has been made in view of such a situation, and an object thereof is to obtain a belt tension applying device that can exhibit high stability during high-speed operation at low cost.
[0006]
[Means for Solving the Problems]
To solve the above problem, According to the first aspect of the present invention The belt tension applying device is a belt tension applying device that applies a predetermined tension to an endless belt that is engaged with a drive shaft of a drive motor and at least two or more rotation shafts, and is inserted through the drive shaft, And a guide hole extending in a frame member to which the drive motor is attached, which enables the drive motor to slide in a tension increasing direction and a tension decreasing direction, and a biasing means for biasing the drive motor in the tension increasing direction. And a fixing means for fixing the drive motor to the frame member in a balanced state between the tension of the endless belt and the urging force of the urging means.
[0007]
This aspect Accordingly, it is possible to obtain a belt tension applying device that can exhibit high stability even at high speed operation at low cost without providing a follower roller for tension adjustment on the endless belt. That is, a drive motor in which an endless belt is engaged with a drive shaft is provided on a frame member to which the drive motor is attached so as to be slidable in a tension increasing direction and a decreasing direction of the endless belt. The means is biased in the direction of increasing tension, and the tension is applied by the biasing force of the biasing means.
[0008]
The belt tension applying device includes fixing means for fixing the drive motor to the frame member in a state where the tension of the endless belt and the urging force of the urging means are balanced. Therefore, the fixing means does not displace the position of the drive motor even during high-speed operation, so that it can exhibit high stability and a state in which a desired appropriate tension is obtained over a long period of time. And can be maintained stably.
[0009]
According to the second aspect of the present invention The belt tensioning device First aspect In this embodiment, the clearance between the outer periphery of the bearing portion of the drive shaft sliding with the inner periphery of the guide hole and the inner periphery of the guide hole is configured to be small. This aspect According to the present invention, the clearance between the outer periphery of the bearing portion of the drive shaft that slides with the inner periphery of the guide hole and the inner periphery of the guide hole is configured to be small. Therefore, the fixed position of the drive motor is uniformly determined without variation, and the intended tension state can be reliably realized.
[0010]
According to the third aspect of the present invention The belt tensioning device First or second aspect The fixing means includes a screw insertion hole extending in parallel with the extending direction of the guide hole in the frame member, and a screw hole and a screw inserted into the screw insertion hole and formed in the drive motor. And a biasing means between the first spring latching portion provided on the drive motor and the second spring latching portion provided on the frame member. It consists of a tension coil spring to be attached.
[0011]
This aspect According to the above, since the fixing means is a fixing screw that is screwed into a screw hole formed in the drive motor, the fixing means of the drive motor can be configured with a simple configuration at low cost, and the attachment Since the urging means is composed of a tension coil spring, the urging means can also be configured at a low cost with a simple configuration.
[0012]
According to the fourth aspect of the present invention The belt tensioning device Third aspect The first spring latching portion is inserted into a pin insertion hole extending in parallel with the extending direction of the guide hole in the frame member, and a screw portion formed at a tip portion is the drive It consists of a pin member screwed into a screw hole formed in the motor.
[0013]
This aspect According to the above, since the first spring latching portion is composed of a pin member that is inserted into a pin insertion hole that extends parallel to the extending direction of the guide hole, the pin insertion hole and the pin member It becomes possible to more reliably regulate the sliding direction of the drive motor.
[0014]
According to the fifth aspect of the present invention The belt tensioning device Fourth aspect In the above, the clearance between the pin member and the inner periphery of the pin insertion hole is configured to be small.
[0015]
This aspect Since the clearance between the pin member and the inner periphery of the pin insertion hole is small, the pin member slides without rattling, and thus the drive motor is more reliably connected. It becomes possible to regulate the sliding direction.
[0016]
According to the sixth aspect of the present invention The belt tensioning device Fourth or fifth aspect The pin member is configured to also serve as the fixing means by being screwed into a screw hole formed in the drive motor while pinching the frame member with the drive motor. And
[0017]
This aspect Since the pin member is configured to also serve as the fixing means by screwing with the screw hole formed in the drive motor while pinching the frame member with the drive motor, As a result, the drive motor can be more firmly fixed to the frame member.
[0018]
According to the seventh aspect of the present invention The belt tensioning device Any one of the first to sixth aspects The drive motor is biased straight in the extending direction of the guide hole.
[0019]
This aspect According to the above, since the drive motor is urged straight in the extending direction of the guide hole, the drive shaft sliding with the inner periphery of the guide hole or the bearing portion of the drive shaft or the like thereby The endless belt can be applied with a small transmission loss without urging strongly against the inner periphery of the urging means, so that the intended tension state can be realized.
[0020]
According to the eighth aspect of the present invention The recording apparatus includes a recording unit that records on a recording material, a conveyance drive roller that conveys the recording material to the recording unit at a constant pitch, and a discharge that discharges the recording material recorded by the recording unit. Driving a paper drive roller, the transport drive roller and the paper discharge drive roller; According to any of the first to seventh aspects A drive motor, a gear for rotating the transport drive roller, a gear for rotating the paper discharge drive roller, and a pinion gear provided on a drive shaft of the drive motor; Apply tension to the endless belt According to any of the first to seventh aspects A Belton tension applying device is provided.
[0021]
This aspect According to the present invention, the recording apparatus for recording on the recording material includes a gear that rotates the conveyance drive roller, a gear that rotates the discharge drive roller, and a pinion gear provided on the drive shaft of the drive motor. Apply tension to the endless belt that has been entangled, According to any of the first to seventh aspects Since the Belton tension applying device is provided, the recording device for recording on the recording material has been described above. Any one of the first to seventh aspects The same effect can be obtained.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Configuration of the main body of the inkjet printer>
Hereinafter, the configuration of the apparatus main body of the ink jet printer according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is an external perspective view of the main body of the ink jet printer (hereinafter simply referred to as “printer”) 100, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional side view thereof, and FIG. FIG.
[0023]
1 and 2, the printer main body is divided into a plurality of units, and the apparatus main body is configured by combining the plurality of units. In the figure, reference numeral 1 denotes a paper feeding unit as a paper feeding device capable of feeding paper P (see FIG. 3) or roll paper (not shown) as a recording material, and reference numeral 20 denotes an ink jet recording head 24 (see FIG. 3 is a carriage unit including a carriage 22, 60 is a conveyance unit for conveying a recording material, and 80 is an ink system unit for maintaining the inkjet recording head 24. 2 is divided into these four units as shown in FIG. 2, and these four units are combined as shown in FIG. In this embodiment, the carriage unit 20 and the ink system unit 80 are connected to the upper side and the right side (right side in FIG. 4) of the transport unit 60, respectively, and the paper feed unit 1 is connected to the back side of the carriage unit 20. By doing so, the four units are configured to be combined.
[0024]
Next, the paper conveyance path of the printer 100 will be described with reference to FIG. In the following, the left side of FIG. 3 (the rear side of the printer 100) is referred to as “upstream side”, and the right side of FIG. 3 (the front side of the printer 100) is referred to as the downstream side. The printer 100 includes a hopper 6 on the upstream side, and a sheet P as a cut sheet is stacked and stored on the hopper 6 in an inclined posture. The hopper 6 is provided so as to be rotatable in the clockwise and counterclockwise directions of FIG. 3 around a rotation fulcrum (not shown) located at the upper portion, and the lower portion is relative to the paper feed roller 3 by rotating. The pressure contact and separation operation are performed. The hopper 6 includes a movable guide 4 that can slide in the width direction of the paper P (see FIG. 1), and guides the side edge of the accumulated paper P together with the fixed guide 5 (see FIG. 1). Then, the uppermost one of the stacked sheets P is fed out to the downstream side when the hopper 6 presses the sheet feeding roller 3 and the sheet feeding roller 3 rotates in the pressed state. The sheet feed roller 3 has a substantially D shape when viewed from the side, and rotates when the rotation shaft 3a is driven to rotate. The paper feed roller 3 is controlled so that its flat portion faces the paper P during the printing operation (the state shown in FIG. 3), thereby preventing the transport load of the paper P from being generated.
[0025]
Next, a sheet guide 67 as a plate-like body is provided substantially horizontally downstream from the sheet feed roller 3, and the leading edge of the sheet P fed out by the sheet feed roller 3 strikes the sheet guide 67 obliquely. It touches and is guided smoothly downstream. A conveyance driving roller 62 that is rotationally driven and a conveyance driven roller 63 that is in pressure contact with the conveyance driving roller 62 are provided downstream from the paper guide 67, and the sheet P includes the conveyance driving roller 62, the conveyance driven roller 63, and the like. And is conveyed downstream at a constant pitch.
[0026]
The conveyance driven roller 63 is pivotally supported on the downstream side of the conveyance driven roller holder 64, and the conveyance driven roller holder 64 is provided so as to be rotatable in the clockwise and counterclockwise directions in FIG. 3 around the rotation shaft 64a. In addition, the conveyance driven roller 63 is always urged to rotate in a direction in which it is pressed against the conveyance driving roller 62 (clockwise in FIG. 3) by a torsion coil spring (not shown). The transport driving roller 62 has a rotation shaft that is long in the main scanning direction. Therefore, in the present embodiment, the transport driving roller 62 and the rotation shaft of the transport driving roller 62 are the same.
[0027]
Next, in the vicinity of the conveyance driven roller holder 64 located on the most digit side (right front side in FIG. 2), a paper detector 36 comprising a sensor main body 36b and a detector 36a for detecting the passage of the paper P is provided. It is arranged. The detector 36a has a substantially "<" shape when viewed from the side, and is provided so as to be pivotable in the clockwise and counterclockwise directions in FIG. 2 about a pivot shaft 36c near the center thereof. The sensor main body 36b positioned above the detector 36a includes a light emitting portion (not shown) and a light receiving portion (not shown) that receives light from the light emitting portion, and the upper side of the rotation axis 36c of the detector 36a is on the upper side. The rotation operation blocks and passes light from the light emitting portion toward the light receiving portion. Accordingly, as shown in FIG. 3, when the detector 36a is rotated so as to be pushed upward with the passage of the paper P, the upper side of the detector 36a is detached from the sensor main body 36b. Thus, the passage of the paper P is detected.
[0028]
Subsequently, the platen 66 and the inkjet recording head 24 are arranged downstream of the transport driving roller 62 so as to face each other. The platen 66 is long in the main scanning direction (see FIG. 2), and the sheet P conveyed below the inkjet recording head 24 by the rotation of the conveyance driving roller 62 is supported from below by the platen 66. The ink jet recording head 24 is provided at the bottom of a carriage 22 on which the ink cartridge 23 is mounted. The carriage 22 reciprocates in the main scanning direction while being guided by a carriage guide shaft 25 extending in the main scanning direction. In this embodiment, the ink cartridge 23 is composed of four cartridges as shown in FIG. 4, that is, four cartridges filled with four colors of ink (black, yellow, cyan, magenta), respectively, Each can be exchanged independently.
[0029]
Next, downstream of the ink jet recording head 24 is a paper discharge portion of the printer 100, and a paper discharge driving roller 65, a paper discharge driven roller 31, and a paper discharge auxiliary roller 32 are disposed. A plurality of paper discharge drive rollers 65 are attached in the axial direction of the paper discharge drive roller shaft 65a that is rotationally driven (see FIG. 4), and the paper discharge driven roller 31 that is pivotally supported by the paper discharge driven roller holder 31a. The paper discharge drive roller 65 is provided so as to be driven and rotated by being pressed lightly. Accordingly, the paper P printed by the ink jet recording head 24 is rotated in a state where the paper P is nipped by the paper discharge driving roller 65 and the paper discharge driven roller 31, so that the paper discharge direction (see FIG. (In the direction of arrow 3). The paper discharge auxiliary roller 32 pivotally supported by the paper discharge auxiliary roller holder 32a is provided slightly upstream of the paper discharge driven roller 31. The paper discharge roller 32 presses the paper P slightly downward from the platen 66. Thus, the distance between the paper P and the inkjet recording head 24 is restricted.
[0030]
Here, the hopper 6, the movable guide 4, the fixed guide 5, and the paper feed roller 3 described above are provided in the paper feed unit 1 shown in FIGS. As shown in FIG. 2, the sheet feeding unit 1 is arranged by a sheet feeding unit frame 2 having a substantially columnar mounting portion right 2a and a mounting portion left 2b, which are erected on the left and right sides with a hopper 6 interposed therebetween. A base is configured, and the hopper 6, the rotation shaft 3a of the paper feed roller 3, and the like are provided in the paper feed unit frame 2. The paper feed unit 1 is connected to the rear side of the carriage unit 20 at the upper part of the attachment part 2a and the attachment part 2b.
[0031]
Next, the paper guide 67, the transport drive roller 62, the transport driven roller holder 64, and the paper discharge drive roller shaft 65a are provided in the transport unit 60 shown in FIGS. As shown in FIG. 2, the transport unit 60 includes a transport unit frame 61 having a substantially U-shape in plan view. The transport unit frame 61 includes a power supply unit 68 that is a power supply unit of the printer 100 on the rear side. The drive roller shaft 65a is pivotally supported by the conveyance drive roller 62 in the middle of the main body, the platen 66 is provided at the upper front portion, and the conveyance driven roller holder 64 is provided at the upper middle portion. Further, the conveyance unit 60 has a drive serving as a common drive source for the paper feed roller 3, the conveyance drive roller 62, the paper discharge drive roller 65, a pump device 82 to be described later, and the blade unit 84 at the lower left side. A motor 69 (see FIG. 4) is provided. Power transmission from the drive motor 69 to the paper feed roller 3, the conveyance drive roller 64, and the paper discharge drive roller 65 is performed by a power transmission device 50, which will be described later, provided on the left side surface of the conveyance unit 60. The power transmission to the pump device 82 and the blade unit 84 provided on the right side of the power transmission device via the paper discharge drive roller shaft 65a is performed by a power transmission device (gear device) (not shown) provided at the right end of the paper discharge drive roller shaft 65a. ).
[0032]
An ink system unit 80 connected to the right side of the transport unit 60 and serving as maintenance means for the ink jet recording head 24 is a frame serving as a unit base connected to the right side of the transport unit frame 61 as shown in FIG. 81, and the frame 81 is provided with a cap device 83, a pump device 82, and a blade unit 84. In the cap device 83, the carriage 22 is at the home position (a in FIG. ₁ The ink jet recording head 24 is capped to move the nozzle surface (not shown) when it moves into the region), and the pump device 82 supplies negative pressure to the cap device 83 in the capped state. Ink is sucked from the nozzle opening. The blade unit 84 can move between a position crossing the reciprocating area of the carriage 22 and a position retracting from the reciprocating area. The blade unit 84 moves to a position crossing the reciprocating area of the carriage 22, and the carriage 22 prints. Region (a in FIG. ₀ Area) to home position (a in FIG. 4) ₁ Cleaning is performed by wiping the nozzle surface (not shown) of the inkjet recording head 24 by moving into the region) or by moving in the opposite direction.
[0033]
The carriage guide shaft 25 and the paper detector 36 are provided in the carriage unit 20. As shown in FIG. 2, the carriage unit 20 includes a main frame 21a, and a side frame right 21b and a side frame left 21c erected on both sides of the main frame 21a. 25 is supported.
[0034]
Further, as shown in FIG. 4, the carriage unit 20 includes a carriage motor 27 on the rear left side of the unit, and a drive pulley 28 is attached to the carriage motor 27. A driven pulley 29 is provided on the right side of the unit. A carriage belt 26 is suspended between the driving pulley 28 and the driven pulley 29, and a part of the carriage belt 26 is fixed to the carriage 22. . Therefore, the carriage 22 reciprocates in the main scanning direction (left-right direction in FIG. 4) by the rotation of the carriage motor 27.
[0035]
In FIG. 2, the paper discharge frame 30 is attached to the carriage unit 20 side. However, the paper discharge frame 30 can be attached to the carriage unit 20 side or the transport unit 60 side. It is also possible to belong to the side.
The above is the configuration of the apparatus main body of the printer 100, and the printer 100 is movable when the four units are combined and connected.
[0036]
<Configuration of power transmission device>
Next, the configuration of the power transmission device 50 provided on the left side surface of the transport unit 60 will be described with reference to FIGS. 5 to 7. 5 is a left side view of the transport unit 60, FIG. 6 is an enlarged view of the shaft end portion of the rotating shaft 48, and FIG. 7 is a perspective view of the power transmission device 50.
[0037]
In FIG. 5, a drive motor 69 that is a drive source of the power transmission device 50 is a front lower side (lower right in FIG. 5) of a left side surface (left side surface in FIG. 4) of a transport unit frame 61 that is a base of the transport unit 60. The conveyance drive roller 62, the paper discharge drive roller shaft 65a, and the paper feed roller shaft 3a (see FIG. 3) described with reference to FIG. 3 are rotationally driven.
[0038]
A pinion gear 78 is attached to the drive shaft 69 a of the drive motor 69, the pinion gear 78, a transmission gear 49 provided above the drive motor 69, and a transmission gear 52 provided in the rear middle of the transport unit frame 61. , An endless belt 51 to which a tension is applied by a belt tension applying device 70 described later is engaged. Accordingly, when the drive motor 69 is rotated, the transmission gears 49 and 52 are simultaneously rotated via the endless belt 51.
[0039]
A transmission gear 49 provided so as to be able to be driven and rotated about a rotation shaft 49a is a gear (not shown) meshed with the endless belt 51, and a paper discharge drive attached to the shaft end of the paper discharge drive roller shaft 65a. This is a two-stage gear comprising a gear (not shown) with which the roller gear 65b is engaged, and accordingly, the paper discharge drive roller shaft 65a is rotationally driven.
[0040]
The transmission gear 52 provided so as to be able to be driven and rotated about the rotation shaft 48 is constituted by a two-stage gear like the transmission gear 49, and the gear 52 a with which the endless belt 51 is engaged and the shaft end of the conveyance drive roller 62. A gear 52b that engages with a conveyance drive roller gear 62b attached to the gear is integrally formed, and is provided to be rotatable about a rotation shaft 48. Accordingly, the transport driving roller 62 is driven to rotate.
[0041]
The transmission gear 52 is attached with a disc scale 41 constituting the encoder 40. The encoder 40 includes a sensor holder 53 attached to the transport unit frame 61, a photo interrupter (light sensor) 44 attached to the sensor holder 53, and a disc scale 41. The photo interrupter 44 is attached to the sensor holder 53 with the printed circuit board 45 attached, and is connected to a control device (not shown). The photo interrupter 44 is composed of a light emitting unit (not shown) and a light receiving unit (not shown) that receives radiation emitted from the light emitting unit and is spaced from the light emitting unit, and Between these, the outer peripheral part of the disk-shaped scale 41 is inserted.
[0042]
The disk-like scale 41 has a slit-like shape in which light transmitting portions (not shown) and light blocking portions (not shown) having substantially the same width are alternately and repeatedly formed at a constant pitch in the circumferential direction. It has a rotation detection pattern (not shown). When the disk-like scale 41 rotates, the rotation detection pattern repeats the transmission and blocking of light in the photo interrupter 44, and the photo interrupter 44 generates a rectangular wave signal that repeats ON and OFF alternately. A control unit (not shown) of the printer 100, which is given to a control device (not shown) of the printer 100, obtains the conveyance amount of the paper P from the number of the rectangular waves, and conveys the paper P from the repetition period of the rectangular waves. The speed is to be calculated.
[0043]
Here, the rotation shaft 48, which is the rotation shaft of the transmission gear 52 and the disk-shaped scale 41, is fixed by a shaft fixing member 56. That is, as shown in FIG. 6, the shaft stopping member 56 is a ring-shaped member that fits into the groove 48a formed along the circumferential direction at the shaft end of the rotating shaft 48, and by fitting into the groove 48a, The transmission gear 52 and the disk-like scale 41 are held between the transfer unit frame 61 and at the same time the rotation shaft 48 is fixed. As shown in FIG. 6, half (upper side in FIG. 6) has a ring shape (circular shape), and the other half (lower side in FIG. 6) has a square shape. The knobs 56b and 56b are formed by the square corners. Further, a slit 56a is formed in the vicinity of the middle of the rectangular shape, whereby the picking portions 56b and 56b are picked by tweezers and the like, and the shaft-stopping member 56 is easily attached by twisting them so that they are alternate. It can be removed from the groove 48a. Therefore, for example, when the printer 100 is disassembled, the disassembling work is facilitated, and the components of the printer 100 can be easily recycled. The shaft stop member 56 is also used for other rotating shafts, for example, a paper discharge drive roller shaft 65a as shown in FIG.
[0044]
Next, a transmission gear 50 that meshes with the conveyance drive roller gear 62b is provided behind the conveyance drive roller gear 62b (on the left side in FIG. 5). The transmission gear 50 is provided on the paper feed unit 1 side. The transmission gear 59 is engaged when the paper feeding unit 1 is connected to the carriage unit 20. Accordingly, the paper feed roller shaft 3a (see FIG. 3) is rotated.
[0045]
The above is the general configuration of the power transmission device 50 provided on the left side surface of the transport unit 60. Next, the belt tension applying device 70 that applies an appropriate tension to the endless belt 51 will be described in detail.
In FIG. 7, a belt tension applying device 70 that applies tension to the endless belt 51 includes a guide hole 75 that is formed in the transport unit frame 61 and passes through the drive shaft 69 a of the drive motor 69, and the drive motor 69 is connected to the endless belt 51. A tension coil spring 71 as an urging means for urging in the direction in which the tension increases, a fixing screw 74 for fixing the drive motor 69 to the transport unit frame 61, and a pin member 72 as a "first engaging portion" , And a spring retaining portion 73 as a “second engaging portion”.
[0046]
The guide hole 75 extends in the vertical oblique direction (the direction from the upper rear side of the printer 100 toward the lower front side) of the printer 100 in the transport unit frame 61, and the drive shaft 69 a of the drive motor 69 is inserted therethrough. A bearing 69b of the drive motor 69 slides (slides) along the inner periphery. The clearance between the outer periphery of the bearing portion 69b and the inner periphery of the guide hole 75 is formed to be small, so that the drive motor 69 can slide linearly in the extending direction of the guide hole 75 without rattling. It has become.
[0047]
A screw insertion hole 77 extends in the upper left of the guide hole 75 (upper left in FIG. 5: upper rear of the apparatus) in the same direction as the guide hole 75, and lower right of the guide hole 75 (lower right in FIG. 5: lower front of the apparatus). ), The pin insertion hole 76 is extended in the same direction as the extension direction of the guide hole 75 in the same manner as the screw insertion hole 77. A fixing screw 74 screwed into a screw hole (not shown) drilled in the drive motor 69 is inserted into the screw insertion hole 77, and the drive motor 69 is drilled into the pin insertion hole 76 in the same manner as the fixing screw 74. A pin member 72 screwed into a provided screw hole (not shown) is inserted, and these can slide (slide) in the same direction as the drive motor 69 (bearing portion 69b).
[0048]
Here, the pin member 72 is a member having a non-threaded portion 72a that is long in the axial direction of the drive shaft 69a, and a screw portion (not shown) formed at the tip portion is formed in the drive motor 69 as described above. A portion that is screwed into a screw hole (not shown) and slides with the pin insertion hole 76 is a non-threaded portion 72b (see FIG. 5) having substantially the same width as that of the pin insertion hole 76. The screw portion 72b slides within the pin insertion hole 76 without rattling. Further, the pin member 72 has a stepped shape in which the conveyance unit frame 61 is clamped with the drive motor 69 by a non-screw portion 72a having a diameter larger than that of the non-screw portion 72b sliding with the pin insertion hole 76. Thus, it has a function as a fixing means for fixing the drive motor 69 to the transport unit frame 61 together with the fixing screw 74.
[0049]
Next, the guide hole 75, the screw insertion hole 77, and the pin insertion hole 76 described above are arranged in the same direction so that the drive shaft 69a, the fixing screw 74, and the pin member 72 slide on the same straight line. Further, on the extended line of the straight line, a spring latching portion 73 as a “second spring latching portion” is provided in the transport unit frame 61. Then, a tension coil spring 71 as an urging means is attached to the spring hooking portion 73 and the pin member 72, thereby pulling the drive motor 69 straight in the extending direction of the guide hole 75. ing. Therefore, the tension direction is the tension increasing direction of the endless belt 51, and the opposite direction is the tension decreasing direction.
[0050]
The effects of the belt tension applying device 70 configured as described above for applying tension to the endless belt 51 will be described below. The drive motor 69 is slidable in the extending direction of the guide hole 75 by the tension coil spring 71 as described above, and an appropriate tension can be applied to the endless belt 51 by the urging force of the tension coil spring 71. It has become. Accordingly, for example, there is no need to separately provide a tension applying driven roller between the pinion gear 78 and the transmission gear 49, and the belt tension applying device 70 for applying tension to the endless belt 51 is configured at low cost. Yes.
[0051]
Next, the drive motor 69 is slidably provided, and is fixed to the transport unit frame 61 reliably by a fixing screw 74 and a pin member 72 with a simple and inexpensive structure. Therefore, by the fixing means comprising the fixing screw 74 and the pin member 72, the drive motor 69 does not slide even at high speed operation, so that high stability can be exhibited and an appropriate target tension can be obtained. It is possible to maintain a stable state over a long period of time.
[0052]
Further, since the clearance between the inner periphery of the guide hole 75 and the outer periphery of the bearing portion 75 is configured to be small, the drive motor 69 slides without rattling, so that the fixing position of the drive motor 69 is fixed. For example, the quality can be kept constant among a plurality of apparatuses. Further, the pin member 72 is also configured to slide in the pin insertion hole 76 without rattling, so that the fixed position of the drive motor 69 is further uniformly determined, and the above-described effects can be further improved. More can be obtained.
[0053]
In addition, since the pin member 72 and the tension coil spring 71 are disposed in the outer region of the endless belt 51, it is possible to apply a biasing force to the drive motor 69 in a stable state on the side far from the endless belt 51. It becomes possible. Further, since the drive motor 69 is urged straight in the extending direction of the guide hole 75 as described above, the bearing portion 69b is not pressed against the inner periphery of the guide hole 75, and hence the tension coil spring 71 is not pressed. The urging force can be accurately applied to the endless belt 51 without causing transmission loss.
[0054]
<Configuration of motor positioning device>
Next, the drive motor 69 described above is positioned by a motor positioning device 200 described below and attached to the transport unit frame 61 in order to be attached to the transport unit frame 61 in a more appropriate state. Hereinafter, the configuration of the motor positioning device 200 will be described with reference to FIGS. 8 to 10. 8 is an external perspective view of the motor positioning device 200, FIG. 9 is a side view (partially sectional view), FIG. 10 (A) is a view as viewed from the arrow y in FIG. 9, and FIG. 10 (B) is FIG. It is xx sectional drawing in (A).
[0055]
In FIG. 8, the motor positioning device 200 includes a frame mounting plate 101 made of a plate-like body, and a side surface that is erected in the vicinity of both side ends of the frame mounting plate 101 and supports the frame mounting plate 101 in an inclined posture. The main body is constituted by a support plate 102 (only one side is shown in FIG. 8) having a right triangle shape when viewed. The conveyance unit frame 61 is placed on the frame placement plate 101 so as to be inclined, and the holding blocks 103 and 104 provided on the frame placement plate 101 lower and side (in FIG. 8). It is configured to be held so as not to move in the left direction). That is, the frame mounting plate 101 and the holding blocks 103 and 104 constitute “frame member support means” of the transport unit frame 61.
[0056]
Further, a rectangular window hole 101a is formed at a position slightly upper right from the center of the frame mounting plate 101, and the motor support means 110 that supports the drive motor 69 is exposed from the window hole 101a. It is like. As shown in FIG. 9, the motor support means 110 includes a motor support portion 111 that supports the drive motor 69, a base portion 112 that is attached to the motor support portion 111 and has an inverted T-shape when viewed from the front, and the base portion. The linear guide 113 slides 112 smoothly in the horizontal direction (arrow direction in FIG. 9).
[0057]
Next, returning to FIG. 8, a protection plate 115 having two cylindrical members 114, 114 is provided upright on the right end of the motor mounting plate 101 slightly above. The protection plate 115 is a protection member provided for safety of work so that fingers are not caught in the endless belt 51 when the tension of the endless belt 51 is adjusted while rotating the drive motor 69. The members 114 and 114 serve as a guide member for vertically abutting the driver toward the fixing screw 74 and the pin member 72 when the fixing screw 74 and the pin member 72 are fastened. The fastening operation for fastening 74 and the pin member 72 can be performed easily, properly and uniformly.
[0058]
Next, a power supply connector 105 and a power switch 106 are provided slightly above and to the left of the motor support means 110. The drive motor 69 supported by the motor support means 110 is connected to the power supply connector 105 and is driven to rotate when the power switch 106 is turned on.
[0059]
A frame pressing means 108 is provided in the vicinity of the upper right corner of the frame mounting plate 101. The frame pressing means 108 is a lever device having an elastically deformable elastic member 108a. The elastic member 108a presses against a part of the transfer unit frame 61, thereby pressing the transfer unit frame 61 from above (FIG. 10A). )), And serves to hold down the transport unit frame 61 so that it does not float upward during the positioning operation of the drive motor 69.
[0060]
Next, a method for positioning the drive motor 69 using the motor positioning device 200 configured as described above will be described.
First, the fixing screw 74 and the pin member 72 shown in FIG. 7 are lightly fastened, the drive motor 69 is temporarily fixed to the transport unit frame 61, the endless belt 51 is engaged, and the transport unit frame 61 is framed in this state. Place on the mounting plate 101. At this time, the inclination angle of the frame mounting plate 101 is set to the same angle as the inclination angle of the guide hole 75 shown in FIG. 7 (the angle between the extending direction of the guide hole 75 and the horizontal direction). When 61 is placed on the frame placing plate 101, the guide hole 75 is in a state extending in the horizontal direction as shown in FIG. Further, when the transport unit frame 61 is mounted on the frame mounting plate 101, the transport unit frame 61 is mounted so that the drive motor 69 is supported by the motor support 111 as shown in FIG. To do. Since the support surface of the support portion 111 has a concave shape (in this embodiment, V shape) as shown in FIG. 10B, this supports the drive motor 69 without rolling on the support portion 111. You can do that.
[0061]
Next, in FIG. 9, the fixing screw 74 and the pin member 72 are loosened. At this time, the drive motor 69 is supported in a horizontal posture (horizontal direction in FIG. 10A) by the motor support portion 111 and is slidable in the direction of the arrow in FIG. By loosening 72, the drive motor 69 slides to a position where the spring force of the tension coil spring 71 and the tension of the endless belt 51 are balanced, and stops at that position. At this time, the fixing screw 74, the drive shaft 69a, the pin member 72, and the spring hooking portion 73 are linearly arranged along the extending direction of the guide hole 75, so that the bearing portion 69b is The driving shaft 69b is not urged against the inner periphery of the guide hole 75 in the extending direction of the guide hole 75, so that the urging force of the tension coil spring 71 is applied to the endless belt 51 as it is. It is possible to set an appropriate tension.
[0062]
Next, the drive motor 69 is connected to the power supply connector 105, the power switch 106 is turned on, and the endless belt 51 is operated. By operating the endless belt 51, the tension distribution of the endless belt 51 becomes uniform, the axial position of the endless belt 51 in the drive shaft 69b is stabilized, and the fixing screw 74 and the pin member 72 are fastened in this state. Then, the drive motor 69 is securely fixed to the transport unit frame 61. 8 and 10A, reference numeral 107 indicates that the transport unit frame 61 does not move in the screw fastening direction (rightward in FIG. 10A) when fastening the fixing screw 74 and the pin member 72. The holding | maintenance block as a screw fastening holding | maintenance part to hold | maintain is shown.
[0063]
Therefore, the motor positioning device 200 has the following operational effects as described above. That is, since the motor positioning device 200 supports the drive motor 69 in a horizontal posture, the drive motor 69 is not fixed in an inclined posture, and the tension of the endless belt 51 and the spring force of the tension coil spring 71 described above can be obtained. The drive motor 69 can be fixed without breaking the balance, i.e., the proper tension state. Further, the motor positioning device 200 includes the motor support means 110 that supports the transport unit frame 61 so that the guide hole 75 extends in the horizontal direction and slides the drive motor 69 in the horizontal direction. In the state of balance between the tension of the endless belt 51 and the spring force of the tension coil spring 71 described above, the self-weight of the drive motor 69 is not applied to the endless belt 51, and the spring force of the tension coil spring 71 is directly applied to the endless belt 51. It is possible to form a tension state and thereby accurately apply a target tension.
[0064]
In this embodiment, the motor holding means 110 supports the rear portion of the drive motor 69 as shown in FIG. 10A, and the drive motor 69 is placed in a horizontal posture by the motor support portion 111 and the guide hole 75. The height position of the motor support portion 111 is set in advance, but if the height position of the motor support portion 111 can be finely adjusted, the drive motor 69 can be supported in a horizontal posture with higher accuracy. Become.
[0065]
【The invention's effect】
As described above, according to the present invention, the belt tension applying device includes fixing means for fixing the drive motor to the frame member in a state where the tension of the endless belt and the urging force of the urging means are balanced. Therefore, even when driving at high speeds, the drive motor does not change its position, so it can exhibit high stability, and a state in which the desired appropriate tension has been obtained can Can be stably maintained without fluctuation.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an apparatus main body of an ink jet printer according to the present invention.
FIG. 2 is an exploded perspective view of an apparatus main body of an ink jet printer according to the present invention.
FIG. 3 is a side sectional view of the ink jet printer according to the present invention.
FIG. 4 is a front view of the main body of the ink jet printer according to the present invention.
FIG. 5 is a left side view of a transport unit constituting the ink jet printer according to the present invention.
FIG. 6 is an enlarged view of a rotation shaft shaft end portion on the left side surface of the transport unit.
FIG. 7 is a perspective view of a power transmission device provided on the left side surface of the transport unit.
FIG. 8 is an external perspective view of a motor positioning device.
FIG. 9 is a side view of the motor positioning device.
10A is a view taken in the direction of an arrow y in FIG. 9, and FIG. 10B is a cross-sectional view taken along line xx in FIG.
[Explanation of symbols]
1 Paper feed unit
20 Carriage unit
22 Carriage
24 Inkjet recording head
40 Encoder
50 Power transmission device
51 Endless belt
52 Transmission gear
56 Shaft stop member
60 transport unit
61 Transport unit frame
62 Conveyance drive roller
69 Drive motor
69a Drive shaft
69b Bearing part
70 pinion gear
71 Tension coil spring
72 Pin member
73 Spring hook
74 Fixing screw
75 Guide hole
76 pin insertion hole
77 Screw insertion hole
100 Inkjet printer
101 Frame mounting plate
102 Support plate
103, 104 holding block
105 Power supply connector
106 Power switch
107 holding block
108 Pressing lever
110 Motor support means
111 Motor support
112 foundation
113 Linear guide
114 Cylindrical member
115 Protective plate
200 Motor positioning device

Claims (5)

A belt tension applying device that applies a predetermined tension to an endless belt engaged with a drive shaft of a drive motor and at least two or more rotation shafts,
A guide hole extending through a frame member to which the drive motor is attached, the drive shaft being inserted, and the drive motor being slidable in a tension increasing direction and a tension decreasing direction;
An urging means for urging the drive motor in a tension increasing direction;
Fixing means for fixing the drive motor to the frame member in a balanced state between the tension of the endless belt and the biasing force of the biasing means ;
A belt tension applying device, wherein a clearance between the outer periphery of the bearing portion of the drive shaft sliding with the inner periphery of the guide hole and the inner periphery of the guide hole is small. A belt tension applying device that applies a predetermined tension to an endless belt engaged with a drive shaft of a drive motor and at least two or more rotation shafts,
A guide hole extending through a frame member to which the drive motor is attached, the drive shaft being inserted, and the drive motor being slidable in a tension increasing direction and a tension decreasing direction;
An urging means for urging the drive motor in a tension increasing direction;
Fixing means for fixing the drive motor to the frame member in a balanced state between the tension of the endless belt and the biasing force of the biasing means ;
A screw insertion hole extending in parallel with the extending direction of the guide hole in the frame member;
A fixing screw inserted through the screw insertion hole and screwed into the screw hole formed in the drive motor ; and
The biasing means is constituted by a tension coil spring attached between a first spring latching portion provided in the drive motor and a second spring latching portion provided in the frame member ,
The first spring latching portion is inserted into a pin insertion hole extending in parallel with the extending direction of the guide hole in the frame member, and a screw portion formed at a tip portion is connected to the drive motor. belt tensioning device, characterized in that is constituted by the formed threaded hole and screwed to the pin member. The belt tension applying device according to claim 2 , wherein a clearance between the pin member and the inner periphery of the pin insertion hole is configured to be small. 4. The belt tension applying device according to claim 2 , wherein the pin member is screwed into a screw hole formed in the drive motor while pinching the frame member with a precursor drive motor. A belt tension applying device characterized in that it is also used as a means. A recording unit for recording on a recording material;
A conveyance drive roller for conveying a recording material to the recording unit at a constant pitch;
A paper discharge drive roller for discharging the recording material recorded by the recording unit;
A recording apparatus comprising: the drive motor according to any one of claims 1 to 4 , which drives the conveyance drive roller and the discharge drive roller.
Tension is applied to an endless belt that is engulfed by a gear that rotates the transport drive roller, a gear that rotates the paper discharge drive roller, and a pinion gear provided on a drive shaft of the drive motor. recording apparatus comprising the Belton tensioning device according to any one of claims 1 4.

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