JP5460631B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus.

  2. Description of the Related Art Conventional inkjet recording apparatuses include a transport unit that transports paper or the like as a recording medium, a recording head that is disposed above the transport unit and that discharges ink onto paper or the like transported by the transport unit, and a transport unit that moves up and down. A lifting / lowering unit to be maintained, and a maintenance unit for performing maintenance of the recording head. In such an ink jet recording apparatus, the transport unit is disposed at the raised position by the lifting unit, and ink is ejected from the recording head toward the paper or the like in a state where the transport unit and the recording head are close to each other. An image is recorded. Further, in a state in which no image is recorded on paper or the like, the transport unit is disposed at the lowered position by the elevating unit and is separated from the recording head. Then, in a state where the transport unit is disposed at the lowered position, the maintenance unit is disposed below the recording head and maintenance of the recording head is performed.

  For example, Patent Document 1 proposes an ink jet recording apparatus that includes an elevating unit that is disposed below a transport unit and has a plurality of arms that can rotate with a lower end side as a fulcrum. In the ink jet recording apparatus proposed in Patent Document 1, the transport unit is supported by a plurality of arms. The transport unit is raised by raising the distal ends of the plurality of arms, and the transport unit is lowered by lowering the distal ends of the plurality of arms.

JP 2005-1111938 A

  However, in the lifting unit of the ink jet recording apparatus proposed in Patent Document 1, when the transport unit is rotated from the state where the transport unit is positioned downward to raise the transport unit, the arm in the horizontal state is raised. Initial operation occurs. Therefore, a large load is applied to the arm in this initial operation.

  Therefore, an object of the present invention is to provide a recording apparatus that can reduce the load applied to the lifting unit.

  The present invention provides a transport unit that transports a sheet-like recording medium in a first direction, a recording head that is disposed above the transport unit and that ejects ink onto the recording medium transported by the transport unit, and the transport And an elevating unit that elevates and lowers the unit, wherein the elevating unit includes a placement unit on which the transport unit is placed, and a pair of side portions along the first direction in the placement unit. A lifting part provided with a plurality of pulleys, a pair of side plates respectively disposed on the outside of the pair of side parts in the lifting part, and the pair of side plates arranged so as to connect the pair of side plates between the pair of side plates. A hoisting shaft that is rotatably attached to the side plate, and a lifting unit body that includes a motor that rotates the hoisting shaft, and each of the plurality of pulleys. A plurality of wires that are stretched over one pulley, one end is fixed to the hoisting shaft, and the other end is directly or indirectly connected to the lifting unit body side, the other end of the wire and the lifting / lowering A detection unit disposed between the unit main body and detecting that the wire is pulled with a predetermined force; and the motor when the detection unit detects that the wire is pulled with a predetermined force. The present invention relates to an ink jet recording apparatus including a drive control unit that stops driving of the ink jet recording apparatus.

  In addition, the detection unit is attached to the lifting unit main body so as to be rotatable about a predetermined rotation axis, and has an arm part to which the wire is connected to one end side, and one end is one end side of the arm part or An elastic member connected to the other end side, the other end being fixed to the elevating unit body, and a position overlapping the movable range on the other end side of the arm part in the elevating unit body, the other end of the arm part A sensor that is shielded from light by the side, and the elastic member moves the arm portion in a second rotation direction against a first rotation direction that is a direction in which the arm portion rotates due to a tensile force of the wire. It is preferable that the arm portion is rotated in the first rotation direction against the urging force by the elastic member when the tensile force by the wire exceeds the first force.

  The sensor is preferably disposed at a position where the arm portion is shielded from light by the other end side of the arm portion when the arm portion is pulled by a second force larger than the first force.

  The detection unit is a regulating member that regulates rotation of the arm unit in the second rotation direction from the position of the arm unit when the arm unit is pulled with the first force by the wire. Is preferably further provided.

  In addition, the detection unit is provided in each of the plurality of wires, and the drive control unit is configured to detect the motor when the wires are pulled with a predetermined force by all of the detection units. It is preferable to stop driving.

  The present invention is also a lifting device that lifts and lowers a predetermined member, and a lifting portion that includes a mounting portion on which the member is mounted, and a plurality of pulleys provided on a pair of side portions of the mounting portion; A pair of side plates respectively disposed on the outside of the pair of side portions in the elevating unit, and a winding shaft that is disposed so as to connect the pair of side plates between the pair of side plates and is rotatably attached to the pair of side plates. And an elevating unit main body having a motor for rotating the hoisting shaft, and each of the hoisting unit main body is spanned on one pulley of the plurality of pulleys, one end is fixed to the hoisting shaft, and the other end is It is arranged between a plurality of wires connected directly or indirectly to the lifting unit body side, the other end of the wire and the lifting unit body, and it is detected that the wire has been pulled with a predetermined force. And a drive control unit that stops driving of the motor when the detection unit detects that the wire is pulled with a predetermined force, and the detection unit includes the lifting unit main body. And an arm part to which the wire is connected to one end side, one end is connected to one end side or the other end side of the arm part, and the other end is connected to the arm part. An elastic member fixed to the elevating unit main body, and a sensor arranged at a position overlapping the movable range on the other end side of the arm portion in the elevating unit main body, and shielded from light by the other end side of the arm portion, The elastic member urges the arm portion in a second rotation direction against a first rotation direction, which is a direction in which the arm portion rotates due to a tensile force of the wire, and the arm portion is If the tensile force due to over exceeds a first force to a lifting device which rotates the first rotating direction against the urging force of the elastic member.

  According to the ink jet recording apparatus of the present invention, it is possible to reduce the load applied to the lifting unit.

1 is a longitudinal sectional view schematically showing an outline of an ink jet recording apparatus according to an embodiment of the present invention from the front side. It is a perspective view which shows the state which looked at the conveyance unit and the raising / lowering unit in the inkjet recording device of this invention from the front side of the inkjet recording device. It is a perspective view which shows the state which looked at the raising / lowering unit shown in FIG. 2 from the front side of the inkjet recording device. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a perspective view which shows the raising / lowering part which comprises the raising / lowering unit in the inkjet recording device of this invention. It is a figure which expands and shows the upstream detection part in FIG. It is a figure which shows the state which the arm part of the upstream detection part shown in FIG. 6 rotated. It is a figure which expands and shows the downstream detection part in FIG. It is a figure which shows the state which the arm part of the downstream detection part shown in FIG. 8 rotated.

Hereinafter, a preferred embodiment of an ink jet recording apparatus of the present invention will be described with reference to the drawings.
The overall configuration of the inkjet recording apparatus 1 will be described with reference to FIG. FIG. 1 is a longitudinal sectional view schematically showing an outline of an ink jet recording apparatus 1 according to an embodiment of the present invention from the front side.
As shown in FIG. 1, the inkjet recording apparatus 1 includes a main body 2, a paper feed cassette 3, a paper feed roller 4, a paper transport path 5, a registration roller pair 6, a transport unit 30, A recording unit 20, a lifting unit 40, a cleaning unit 50, a drying device 7, a pair of paper discharge rollers 8, a paper discharge port 9, and a paper discharge tray 10 are provided.

The paper feed cassette 3 stores paper T as a sheet-like recording medium in a stacked state. The paper feed cassette 3 is disposed below the inside of the main body 2 and upstream in the transport direction of the paper T.
The paper feed roller 4 is disposed above the paper feed cassette 3. The paper T is sent out by the paper feed roller 4 toward the upper right of the paper feed cassette 3 in FIG.

  The sheet conveyance path 5, the registration roller pair 6, the conveyance unit 30, and the recording unit 20 are disposed on the downstream side of the sheet feeding cassette 3 in the sheet T conveyance direction. The paper T sent out from the paper feed cassette 3 reaches the registration roller pair 6 through the paper transport path 5. The registration roller pair 6 corrects the oblique feeding of the paper T and feeds the paper T again.

  The conveyance unit 30 includes a driving roller 32, a driven roller 33, a conveyance belt 31 that is stretched over the driving roller 32 and the driven roller 33, a tension roller 34 that adjusts the tension of the conveyance belt 31, and a conveyance surface of the conveyance belt 31. And an air suction unit (not shown) provided on the lower side (the side opposite to the recording unit 20). A number of through holes (not shown) for suction are provided on the upper surfaces of the transport belt 31 and the air suction unit, respectively.

As shown in FIG. 1, the transport unit 30 rotates the driving roller 32 and the driven roller 33 in the counterclockwise direction when viewed from the front, so that the paper disposed on the transport surface 31 </ b> A configured by the upper surface of the transport belt 31. T is conveyed in the first direction P. The air suction unit is disposed below the conveyance surface 31A of the conveyance belt 31 (on the side opposite to the recording unit 20), and applies a suction force that attracts the paper T to the conveyance surface 31A of the conveyance belt 31.
As the conveyor belt 31, a belt in which both ends are overlapped and joined to form an endless shape, a seamless belt (seamless), or the like can be used.

  The recording unit 20 is disposed above the transport unit 30. The recording unit 20 includes recording heads 22 corresponding to four colors. The recording heads 22 corresponding to the four colors are a black recording head 22K, a cyan recording head 22C, a magenta recording head 22M, and a yellow recording head 22Y. These four color recording heads 22K, 22C, 22M and 22Y extend long along the width direction Y orthogonal to the first direction P, which is the transport direction of the paper T in the transport unit 30. The recording heads 22 </ b> K, 22 </ b> C, 22 </ b> M, and 22 </ b> Y are arranged in order from the upstream side to the downstream side in the paper transport direction along the first direction P that is the transport direction of the paper T by the transport belt 31. .

  In the following description, the identification symbols “K”, “C”, “M”, and “Y” are omitted unless the four-color recording heads 22K, 22C, 22M, and 22Y are specified. Is simply referred to as “recording head 22”.

  Each recording head 22 faces the paper T placed on the conveyance surface 31A of the conveyance belt 31 based on image data information (for example, characters, figures, patterns) received from an external computer (not shown). Eject four colors of ink. Each recording head 22 is fixed to the main body 2. Then, with the rotation of the conveyance belt 31 of the conveyance unit 30 in FIG. 1 (left circulation), four color inks are sequentially ejected from each recording head 22 at a predetermined timing. As a result, four color inks of black, cyan, magenta, and yellow are superimposed on the paper T, and a color ink image is printed.

  As an ink discharge method of the recording head 22, for example, a piezo method that pushes out ink using a piezo element (not shown), or bubbles are generated by a heating element (not shown), and ink is discharged by applying pressure. Various discharge methods such as a thermal ink jet method can be adopted.

  As shown in FIG. 1, below the transport unit 30, four ink tanks 23K, 23C, 23M and 23Y are arranged corresponding to the four color recording heads 22K, 22C, 22M and 22Y, respectively. . The four color inks are supplied from the four ink tanks 23K, 23C, 23M and 23Y to the corresponding recording heads 22K, 22C, 22M and 22Y through supply tubes (not shown). .

  The elevating unit 40 elevates (moves) the transport unit 30 in the direction Z (hereinafter also referred to as “vertical direction Z”) perpendicular to the horizontal plane (XY plane) with respect to the recording head 22. The transport surface 31 </ b> A of the transport belt 31 is configured to be relatively close to or away from the recording head 22 by the movement of the transport unit 30 in the vertical direction Z by the lifting unit 40. Details of the elevating unit 40 will be described later.

As shown in FIG. 1, the cleaning unit 50 is configured to be disposed below the recording unit 20 and above the conveyance unit 30 (between the recording unit 20 and the conveyance unit 30).
The cleaning unit 50 is configured to be able to move up and down in conjunction with the lifting and lowering of the transport unit 30 by the lift unit 40 in a state where the cleaning unit 50 is disposed between the recording unit 20 and the transport unit 30.
The cleaning unit 50 is configured to be horizontally movable in the first direction P (see FIG. 1) by a horizontal movement mechanism (not shown). In the state where the cleaning unit 50 is disposed at the lowered position by the elevating unit 40, a wipe position at which each recording head 22 can be cleaned by being disposed below each recording head 22 by a moving operation by a horizontal movement mechanism. Alternatively, it is switched to a retreat position that is separated from the wipe position in the horizontal direction. When the recording unit 20 performs a recording operation or the like, the cleaning unit 50 is disposed at the retracted position.

  The drying device 7 is disposed on the downstream side of the transport unit 30. The drying device 7 dries the ink ejected on the paper T in the recording unit 20.

  The paper discharge roller pair 8, the paper discharge port 9, and the paper discharge tray 10 are arranged in this order on the downstream side of the drying device 7. The paper T, which has been dried by the drying device 7, is sent to the downstream side in the paper transport direction by the paper discharge roller pair 8, passes through the paper discharge port 9, and is a paper discharge tray provided outside the main body 2. 10 and discharged to the outside of the main body 2.

Next, the details of the lifting unit 40 will be described with reference to FIGS.
As shown in FIGS. 2 to 5, the lifting unit 40 of the present embodiment includes a lifting unit 41 on which the transport unit 30 is placed, a lifting unit main body 42 that lifts and lowers the lifting unit 41, and a plurality of wires 43. A detection unit 44 that detects the position of the elevating unit 41, and a drive control unit 45 that controls the elevating of the elevating unit 41.

  As shown in FIG. 5, the elevating unit 41 includes a placement unit 411 on which the transport unit 30 is placed, and a plurality of pulleys 412. The placement unit 411 supports the bottom of the transport unit 30. The mounting portion 411 includes a pair of first plates 411a that are disposed substantially parallel to each other with a predetermined interval, and a pair that is orthogonal to the pair of first plates 411a and is disposed substantially parallel to each other with a predetermined interval. The second plate 411b.

A pair of 1st plate 411a is comprised by the rectangular shape in planar view. The pair of first plates 411 a extends along a first direction P that is the transport direction of the paper T in the transport unit 30.
The pair of second plates 411b are also configured in a rectangular shape in plan view. The pair of second plates 411b extends in the width direction Y orthogonal to the first direction P in the planar direction. Both ends in the longitudinal direction of the pair of second plates 411b are bent.

  The plurality of pulleys 412 are disposed on the side portions along the first direction P in the placement portion 411. In the present embodiment, the plurality of pulleys 412 are attached to bent portions at both ends in the longitudinal direction of the pair of second plates 411b. That is, in this embodiment, the raising / lowering part 41 is provided with four pulleys. These four pulleys 412 are rotatably attached to the mounting portion 411 (a pair of second plates 411b).

  As shown in FIGS. 3 and 4, the elevating unit main body 42 includes a front plate 421a and a rear plate 421b as a pair of side plates 421, and a hoisting shaft that is rotatably attached to the front plate 421a and the rear plate 421b. 422, a motor 423 for rotating the hoisting shaft 422, and a plurality of main body side pulleys 424 attached to the inner surfaces of the front side plate 421a and the rear side plate 421b.

  As shown in FIGS. 3 and 4, the front side plate 421 a and the rear side plate 421 b are configured in a plate shape that is longer than the length in the first direction P of the elevating part 41. The front side plate 421a and the rear side plate 421b are arranged along the first direction P in the longitudinal direction and along the height direction (vertical direction) Z of the inkjet recording apparatus 1 in the width direction. The front side plate 421a is arranged on the outer side (front side) of the two pulleys 412 arranged on the front side of the four pulleys 412 in the elevating / lowering portion 41. The rear plate 421b is disposed on the outer side (back side) of the two pulleys 412 disposed on the back side of the four pulleys 412 in the elevating unit 41. As shown in FIGS. 3 and 4, the rear plate 421b is formed with a discharge port 425 for discharging the air sucked by the air suction unit (not shown).

The hoisting shaft 422 is attached so as to connect the inner surface of the front plate 421a and the inner surface of the rear plate 421b. In the present embodiment, the hoisting shaft 422 is disposed on the upstream side (the right side in FIG. 4) of the transport unit 30 in the transport direction of the paper T.
As shown in FIG. 3, the motor 423 is disposed on the outer surface side of the rear side plate 421b.
The plurality of main body side pulleys 424 are disposed on the upper surface of the inner surface of each of the front side plate 421a and the rear side plate 421b. One of the plurality of wires 43 to be described later is stretched around the plurality of main body side pulleys 424.

  The plurality of wires 43 are stretched around one pulley 412 among the plurality of pulleys 412 constituting the elevating unit 41. In addition, one end of the plurality of wires 43 is fixed to the hoisting shaft 422, and the other end of the plurality of wires 43 is directly or indirectly connected to the front side plate 421a or the rear side plate 421b.

  In the present embodiment, the inkjet recording apparatus 1 includes four wires 43 corresponding to the four pulleys 412. In addition, two of the four wires 43 are arranged along the front plate 421a, and the two wires 43 are arranged along the rear plate 421b.

Here, the connection structure between the lifting unit main body 42 and the lifting part 41 by the wire 43 will be specifically described based on the connection structure on the rear plate 421b side.
As shown in FIG. 4, one of the two wires 43 arranged on the rear plate 421b side is the conveyance direction of the paper T in the two pulleys 412 arranged on the rear plate 421b side. Is stretched over the pulley 412 on the upstream side. More specifically, one end side of the wire 43a laid over the pulley 412 is fixed to the winding shaft 422 via the main body side pulley 424a. The other end side of the wire 43a is connected to the inner surface of the rear side plate 421b via the detection unit 44 described later after passing through the body side pulleys 424b and 424c.

The other wire 43b of the two wires 43 arranged on the rear plate 421b side is a pulley 412 on the downstream side in the transport direction of the paper T of the two pulleys 412 arranged on the rear plate 421b side. It is passed over to. More specifically, one end side of the wire 43b laid over the pulley 412 is fixed to the winding shaft 422 via the main body side pulleys 424a, 424b, and 424d. The other end side of the wire 43b is connected to the inner surface of the rear side plate 421b via the detection unit 44 described later after passing through the body side pulleys 424e and 424f.
Note that, also on the front side plate 421a side, the elevating unit main body 42 and the elevating part 41 are connected by the same structure as the rear side plate 421b.

  The detection part 44 is arrange | positioned between the other end of the wire 43, and the raising / lowering unit main body 42, and detects that the wire 43 was pulled by predetermined force. In the present embodiment, the detection unit 44 is disposed between the other end of each of the four wires 43 and the lifting unit main body 42. More specifically, the upstream side detection unit 44a is arranged on the upstream side in the transport direction of the paper T in each of the front side plate 421a and the rear side plate 421b, and in the transport direction of the paper T in each of the front side plate 421a and the rear side plate 421b. A downstream side detection unit 44b is disposed on the downstream side (see FIG. 4).

First, the upstream side detection unit 44a will be described. As shown in FIG. 6, the upstream side detection unit 44 a includes an arm unit 441, a spring 442 as an elastic member, a PI sensor 443 as a sensor, and a regulating member 444.
The arm portion 441 is configured by a rectangular plate member. The arm portion 441 is attached to the inner surface of the rear plate 421b so as to be rotatable about a predetermined rotation shaft 445. Further, the arm portion 441 is attached so that the longitudinal direction thereof is along the first direction P. The other end of the wire 43a is connected to the upper surface on one end side of the arm portion 441. Accordingly, the arm portion 441 is rotated in the first rotation direction C1 by being pulled by the wire 43a.

  The spring 442 is disposed so as to be extendable in the vertical direction Z. One end (upper end) of the spring 442 is connected to one end side of the arm portion 441. The other end (lower end) of the spring 442 is connected to the inner surface of the rear plate 421b via a nut 446 formed with an engagement hole (not shown) and a bolt 447 into which the nut 446 can be screwed. The spring 442 biases the arm portion 441 in a second rotation direction C2 that opposes the first rotation direction C1, which is the direction in which the arm portion 441 rotates due to the tensile force of the wire 43a. When the spring 442 is pulled with a force exceeding a first force (for example, 10 kgf), the spring 442 starts to expand. The urging force of the spring 442 against the arm portion 441 is adjusted by adjusting the screwing position of the nut 446 and the bolt 447.

The PI sensor 443 is disposed at a position overlapping the movable range on the other end side of the arm portion 441 in the rear side plate 421b. More specifically, as shown in FIGS. 6 and 7, the PI sensor 443 is configured so that the other end of the arm unit 441 is in a state where the arm unit 441 is rotated from the horizontal state by a predetermined angle in the first rotation direction C <b> 1. It is arranged at a position overlapping the side.
The PI sensor 443 includes a light emitting unit disposed on the rear plate 421b side and a light receiving unit disposed with a gap through which the other end side of the arm unit 441 can pass between the light emitting unit. When the other end side of the arm part 441 is disposed between the light emitting part and the light receiving part (see FIG. 7), the PI sensor 443 detects that light transmission from the light emitting part 451 to the light receiving part 452 is blocked. To do.

  The regulating member 444 regulates the rotation of the arm unit 441 in the second rotation direction C2 from the position of the arm unit 441 when the arm unit 441 is pulled by the first force by the wire 43a. More specifically, the regulating member 444 is a pin-shaped member, and is disposed at a position in contact with the upper surface on the other end side of the rotating shaft 445 in the arm portion 441 in the horizontal state, and is fixed to the rear plate 421b. . The restricting member 444 restricts the arm portion 441 from turning in the second turning direction C2 from the horizontal state.

  In the upstream detection unit 44a described above, the arm unit 441 is biased in the second rotation direction C2 by the spring 442 and rotated by the regulating member 444 when the tensile force by the wire 43a is equal to or less than the first force. The movement is restricted and the horizontal state is maintained. When the pulling force by the wire 43a exceeds the first force, the arm portion 441 starts to rotate in the first rotating direction C1 against the biasing force by the spring 442. Then, in a state where the tensile force by the wire 43a is a second force (for example, 12 kgf) larger than the first force, the other end side of the arm portion 441 is located at a position overlapping the PI sensor 443 (see FIG. 7). Thereby, the PI sensor 443 is shielded from light by the other end side of the arm portion 441, and detects that the wire 43a is pulled by the second force which is a predetermined force.

  The downstream side detection unit 44b has the same configuration as the upstream side detection unit 44a except that the arrangement of the spring 442 is different from the upstream side detection unit 44a. In the downstream side detection unit 44b, as shown in FIG. 8, the spring 442 is arranged on the other end side of the arm unit 441 and biases the arm unit 441 in the second rotation direction C2. More specifically, in the downstream side detection unit 44b, the spring 442, the regulating member 444, and the PI sensor 443 are arranged in this order on the other end side of the arm unit 441 with respect to the rotation shaft 445. In the downstream side detection unit 44b, the lower end of the spring 442 is connected to the arm unit 441, and the upper end of the spring 442 is connected to the inner surface of the rear plate 421b via a nut 446 and a bolt 447.

The drive control unit 45 controls the operation of the elevating unit 40. The drive control unit 45 stops the driving of the motor 423 when the detection unit 44 detects that the wire 43 is pulled by the second force that is a predetermined force.
In addition, the lifting unit main body 42 is provided with a PI sensor (not shown) that detects the lowering of the lifting and lowering portion 41 by being shielded from light by the lifting and lowering portion 41 when the lifting and lowering portion 41 is lowered to a predetermined position. ing. The drive controller 45 also stops the driving of the motor 423 even when the PI sensor detects that the elevating unit 41 is located at the lowered position.

Next, the operation of the above lifting unit 40 will be described.
In the ink jet recording apparatus 1, the transport unit 30 is positioned at the ascending position by the elevating unit 40 as shown in FIG. 2 in a state where an image is recorded on the paper T by the recording unit 20. In this state, the plurality of wires 43 are wound on the winding shaft 422.

  In this state, for example, upon receiving a signal indicating that the recording of the image on the paper T by the recording unit 20 has been completed, the drive control unit 45 drives the motor 423 so that the winding shaft 422 is opposite to the winding direction of the wire 43. Rotate in the direction of. Then, the plurality of wires 43 wound up on the hoisting shaft 422 are pulled down, and the lifting unit 41 (mounting unit 411) suspended from the plurality of wires 43 via the plurality of pulleys 412 is: Descend. Thereby, the conveyance unit 30 mounted on the mounting portion 411 is also lowered (see the two-dot chain line portion in FIG. 4).

  When the elevating unit 41 is lowered to a predetermined position, it is detected by the PI sensor (not shown) provided in the elevating unit body 42 that the elevating unit 41 is located at the lowered position. The drive control unit 45 stops driving the motor 423 when the PI sensor detects that the elevating unit 41 is located at the lowered position. Thereby, the descent of the elevating unit 41 is stopped, and the transport unit 30 is positioned at the lowered position.

  When the recording unit 20 receives the signal that the recording of the image on the paper T is started in the state in which the transport unit 30 is in the lowered position, the drive control unit 45 drives the motor 423 to move the winding shaft 422. The wire 43 is rotated in the winding direction. Then, when the plurality of wires 43 are wound up on the hoisting shaft 422, the elevating unit 41 (mounting unit 411) suspended from the plurality of wires 43 via the plurality of pulleys 412 rises (FIG. (See solid line part 4). As a result, the transport unit 30 placed on the placement unit 411 is also raised.

  Here, a predetermined load corresponding to the weight of the elevating unit 41 and the weight of the transport unit 30 is applied to the plurality of wires 43. As a result, the plurality of arm portions 441 connected to the other ends of the plurality of wires 43 are pulled by a predetermined force.

  In this state, when the winding shaft 422 is further rotated to wind up the plurality of wires 43, the transport unit 30 rises to the raised position, and a predetermined contact member (not shown) provided in the main body 2. ). When the winding shaft 422 is further rotated after the transport unit 30 contacts the contact member, the load on the plurality of wires 43 gradually increases, and the force by which the plurality of wires 43 pulls the arm portion 441 is also increased. It grows gradually. Then, when the force with which the plurality of wires 43 pull the arm portion 441 exceeds the first force, the arm portion 441 starts to rotate in the first rotation direction C1. When the force with which the plurality of wires 43 pull the arm portion 441 reaches the second force, the other end side of the arm portion 441 shields the PI sensor 443, and the detection unit 44 has the wire 43 with the second force. Detects being pulled. Then, the drive control unit 45 stops driving the motor 423. Thereby, the conveyance unit 30 is arrange | positioned in the raise position in the state pressed by the main body 2 side by predetermined force.

  In the present embodiment, the drive control unit 45 stops the driving of the motor 423 when it is detected in all the four detection units 44 that the wire 43 is pulled by the second force.

According to the inkjet recording apparatus 1 of the present embodiment described above, the following effects can be obtained.
The lifting / lowering unit 40 includes a lifting / lowering portion 41 having a plurality of pulleys 412, a plurality of wires 43 spanned by the plurality of pulleys 412, a winding shaft 422 for winding the plurality of wires 43, and the winding shaft 422 is rotated. And the motor 423 to be moved. The hoisting part 41 is moved up and down by rotating the hoisting shaft 422 by the motor 423. Thereby, the raising / lowering part 41 can be raised / lowered in the state which maintained the load given to the motor 423 at a fixed value. In addition, since it is not necessary to dispose an arm or the like for raising and lowering the transport unit 30 below the transport unit 30, the ink jet recording apparatus 1 can be downsized.
Further, a detection unit 44 that detects that the wire 43 has been pulled by the second force is provided, and when the detection unit 44 detects that the wire 43 has been pulled by the second force, the motor 423 The drive was stopped. Thereby, when raising / lowering the raising / lowering part 41, the wire 43 is fully wound up and the raising / lowering part 41 can be hold | maintained in a raise position in the state which pressed the conveyance unit 30 to the main body 2 side with predetermined force. Therefore, since the raising / lowering part 41 can be located in a raise position in the state which pressed the conveyance unit 30 to the main body 2 side with predetermined force, the conveyance unit 30 lifted by the raising / lowering unit 40 using the wire 43 is raised. The posture can be held stably.

  Further, the detection unit 44 can be shielded from light by the arm unit 441 that is rotatable with the other end of the wire 43 connected thereto, a spring 442 that biases the arm unit 441 in the second rotation direction C2, and the arm unit 441. When the tensile force by the wire 43 exceeds the first force, the arm portion 441 is rotated in the first rotation direction C1. Thereby, the arm portion 441 is rotated to change the light shielding state of the PI sensor 443, and it can be detected that the wire 43 has been pulled by a force exceeding the first force due to the change in the light shielding state of the PI sensor 443. .

  Further, the PI sensor 443 is disposed at a position where the other end side of the arm portion 441 is positioned when the arm portion 441 is pulled by the second force. As a result, when the wire 43 is pulled by the second force, the drive control unit 45 stops driving the motor 423, so that the lifting / lowering unit 41 can be held in a state where the wire 43 is pulled by the second force. . Therefore, the transport unit 30 placed on the elevating unit 41 can be stably held at the raised position.

  Further, a regulating member 444 that regulates the rotation of the arm portion 441 in the second rotation direction C2 is provided. Therefore, when the tensile force with respect to the arm part 441 by the wire 43 is smaller than the first force, the arm part 441 can be prevented from excessively rotating in the second rotation direction C2.

  Moreover, the detection part 44 was provided about each of the some wire 43, and when it was detected by all the some detection parts 44 that the wire 43 was pulled by 2nd force, the drive of the motor 423 was stopped. . Thereby, in all the positions where the several wire 43 in the raising / lowering part 41 is spanned, the raising / lowering part 41 is stopped in the state which applied the force upward with more than predetermined force. Therefore, the transport unit 30 placed on the elevating unit 41 can be more stably held at the raised position.

As mentioned above, although preferred embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can implement with a various form.
For example, in this embodiment, although the detection part 44 was provided in the other end of each of the some wire 43, it is not restricted to this. That is, the detection unit may be provided only on one of the plurality of wires 43. In this case, the other end of the wire not provided with the detection unit may be directly connected to the inner surface of the lifting unit main body.

  In the present embodiment, the transport unit 30 in the ink jet recording apparatus 1 is lifted and lowered by the lift unit 40, but the present invention is not limited to this. That is, other members may be raised and lowered by the lifting unit.

  DESCRIPTION OF SYMBOLS 1 ... Inkjet recording device, 22 ... Recording head, 30 ... Conveyance unit, 40 ... Elevating unit, 41 ... Elevating unit, 42 ... Elevating unit body, 43 ... Wire, 44 ... Detection unit, 45 …… Drive control unit, 411 …… Placing unit, 412 …… Pulley, 421a …… Front side plate (side plate), 421b …… Rear side plate (side plate), 422 …… Hoisting shaft, 423 …… Motor, 441… ... arm part, 442 ... spring (elastic member), 443 ... sensor (PI sensor), 444 ... regulating member, 445 ... rotating shaft, T ... recording medium (paper)

Claims (6)

A transport unit for transporting a sheet-like recording medium in the first direction;
A recording head disposed above the transport unit and ejecting ink onto the recording medium transported by the transport unit;
An elevating unit for elevating and lowering the transport unit, and an ink jet recording apparatus comprising:
The lifting unit is
A mounting unit on which the transport unit is mounted, and a lifting unit including a plurality of pulleys provided on a pair of side portions along the first direction in the mounting unit;
A pair of side plates respectively disposed on the outside of the pair of side portions in the elevating unit; a hoisting shaft disposed so as to connect the pair of side plates between the pair of side plates and rotatably attached to the pair of side plates; An elevating unit body comprising a motor for rotating the hoisting shaft;
A plurality of wires each of which is wound around one of the plurality of pulleys, one end of which is fixed to the hoisting shaft and the other end of which is directly or indirectly connected to the lifting unit main body side; ,
A detection unit that is disposed between the other end of the wire and the lifting unit main body and detects that the wire is pulled with a predetermined force;
An ink jet recording apparatus comprising: a drive control unit that stops driving of the motor when the detection unit detects that the wire is pulled with a predetermined force. The detector is
An arm unit that is pivotally attached to the elevating unit main body about a predetermined rotation axis, and the wire is connected to one end side;
One end is connected to one end side or the other end side of the arm part, and the other end is fixed to the elevating unit body, and an elastic member;
A sensor disposed at a position overlapping a movable range on the other end side of the arm portion in the lifting unit main body, and shielded from light by the other end side of the arm portion,
The elastic member urges the arm portion in a second rotation direction against a first rotation direction in which the arm portion rotates due to a tensile force of the wire,
2. The ink jet recording apparatus according to claim 1, wherein the arm portion rotates in the first rotation direction against an urging force by the elastic member when a tensile force by the wire exceeds a first force. 3. .   The inkjet recording according to claim 2, wherein the sensor is disposed at a position where light is shielded by the other end side of the arm portion when the arm portion is pulled by a second force larger than the first force. apparatus.   The detection unit further includes a regulating member that regulates rotation of the arm unit in the second rotation direction from the position of the arm unit when the arm unit is pulled by the wire with the first force. An ink jet recording apparatus according to claim 2 or 3. The detection unit is provided in each of the plurality of wires,
The said drive control part stops the drive of the said motor, when it is detected by all the said detection parts that the said wire was pulled by predetermined | prescribed force. Inkjet recording device. An elevating unit for elevating a predetermined member,
A mounting unit on which the predetermined member is mounted, and a lifting unit including a plurality of pulleys provided on a pair of side portions of the mounting unit;
A pair of side plates respectively disposed on the outside of the pair of side portions in the elevating unit, a winding shaft disposed between the pair of side plates and rotatably attached to the pair of side plates, and the winding shaft being driven to rotate An elevating unit body including a motor to be
A plurality of wires each of which is wound around one of the plurality of pulleys, one end of which is fixed to the hoisting shaft and the other end of which is directly or indirectly connected to the lifting unit main body side; ,
A detection unit that is disposed between the other end of the wire and the lifting unit main body and detects that the wire is pulled with a predetermined force;
A drive control unit that stops driving of the motor when the detection unit detects that the wire is pulled with a predetermined force; and
The detector is
An arm unit that is pivotally attached to the elevating unit main body about a predetermined rotation axis, and the wire is connected to one end side;
One end is connected to one end side or the other end side of the arm part, and the other end is fixed to the elevating unit body, and an elastic member;
A sensor disposed at a position overlapping a movable range on the other end side of the arm portion in the lifting unit main body, and shielded from light by the other end side of the arm portion,
The elastic member urges the arm portion in a second rotation direction against a first rotation direction in which the arm portion rotates due to a tensile force of the wire,
The arm unit is an elevating unit that rotates in a first rotation direction against an urging force by the elastic member when a tensile force by the wire exceeds a first force.

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