JP7203693B2 - Belt drives and inkjet printers - Google Patents

Description

The present invention relates to a belt driving device and an inkjet printer that drive either one of a pair of pulleys over which a belt is stretched.

As a conventional belt driving device, there are a belt that moves an object fixed to itself by its own transportation, a first pulley that rotates by transmitting the rotational motion of a motor and is hung with the belt, and a first pulley that is hung with the belt. 2 pulleys, a link member provided with a rotation shaft supporting portion that supports the rotation shaft of the second pulley, and the link member can move in a rotation direction about an axis parallel to the rotation shaft of the second pulley. a support member for supporting the link member to the support member; a compression coil spring for biasing the link member to apply tension to the belt through a second pulley supported by the link member; and a male screw that is engaged with the female screw and pushes the compression coil spring in the direction in which the compression coil spring contracts (see, for example, Patent Document 1). This belt driving device converts the rotational motion of the first pulley into the linear motion of the belt, so that an object fixed to the belt can be linearly moved by the transport of the belt.

In the conventional belt driving device, if the tension of the belt is too small, slippage occurs between the first pulley and the belt. can't For example, in a conventional belt drive device, when teeth for transmitting motion are formed on both the inner peripheral surface of the belt and the outer peripheral surface of the first pulley, the belt may be unbalanced if the belt tension is too small. and the teeth of the first pulley, the rotary motion of the first pulley cannot be efficiently converted into the linear motion of the belt.

In addition, in the conventional belt driving device, if the tension of the belt is too large, the belt may stretch and crack, or the belt may stretch and break, resulting in durability deterioration or damage to the belt. The rotary motion of the belt cannot be efficiently converted into the linear motion of the belt.

Therefore, in order to efficiently convert the rotary motion of the first pulley into the linear motion of the belt in the conventional belt drive device, the tension of the belt needs to be adjusted to an appropriate tension.

In the conventional belt drive device, by changing the amount of insertion of the male screw into the female screw, the link member pushed by the male screw through the compression coil spring moves in the rotational direction about the axis, and as a result, Since the distance from the second pulley whose rotating shaft is supported by the link member to the first pulley changes, the tension of the belt applied to the first pulley and the second pulley changes. That is, in the conventional belt driving device, the tension of the belt can be adjusted to an appropriate tension by adjusting the amount of insertion of the male thread into the female thread.

JP 2004-148727 A

However, in the conventional belt drive, there is a problem that the number of components is large, and the total price of the components is high, resulting in high cost.

In addition, since the conventional belt driving device has a large number of components, it takes a long time to assemble and replace the belt, resulting in a problem of high cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a belt driving device and an inkjet printer that can reduce the number of components.

A belt driving device according to the present invention is a belt driving device comprising a pair of pulleys, a belt stretched over the pair of pulleys, and a drive source for driving either one of the pair of pulleys. a link member that swings about a swing axis parallel to the rotation axis of the pair of pulleys; and a support member that supports the link member so that the link member swings about the fulcrum. wherein the link member includes a first link portion extending from the fulcrum and provided with a point of action, and a second link portion extending from the fulcrum and provided with a force point; One end of the link member is a fixed end and the other end is a free end. By urging the point of force by the urging member, the point of action acts on the pulleys to cause the pair of pulleys to move. swing away from each other to apply tension to the belt.

With this configuration, the belt drive of the present invention applies tension to the belt by means of a biasing member having one end that is fixed and the other end that is free. A male screw that is fitted into a female screw arranged at a fixed position and pushes the compression coil spring in the direction in which the compression coil spring contracts is not required, and the number of components can be reduced.

In the belt drive device of the present invention, the link member may support the rotating shaft of one of the pair of pulleys at the point of action.

In the belt drive device of the present invention, the link member is moved by the belt while a first straight line connecting the fulcrum and the point of force intersects a second straight line connecting the fulcrum and the point of action. The first straight line may extend substantially parallel to the moving direction of the object by the belt.

With this configuration, in the belt drive device of the present invention, the first straight line connecting the fulcrum and the force point extends substantially parallel to the moving direction of the object by the belt. However, the distance from the fulcrum to the force point can be lengthened.

In the belt drive device of the present invention, the second link portion may include a tongue-shaped leaf spring as the biasing member, and the force point may be provided on the free end side of the leaf spring. .

In general, leaf springs tend to have a relatively large spring constant compared to compression coil springs when rigidity and durability are taken into account. However, in the belt drive device of the present invention, the distance from the fulcrum to the point of force can be lengthened while preventing the belt drive device itself from becoming large. The spring constant of the spring can be reduced.

In the belt drive device of the present invention, the second link portion includes a leaf spring provided with the force point as the biasing member, and the first link portion and the second link portion are integrally formed. It's okay to be.

With this configuration, the belt driving device of the present invention applies tension to the belt by means of a leaf spring integrally formed with the first link portion instead of a conventional compression coil spring, so that the number of components can be reduced. can be reduced.

In the belt drive device of the present invention, the leaf spring may bias the first link portion by contacting the support member.

With this configuration, the belt driving device of the present invention includes a member for supporting the link member so that the link member can move in a rotational direction about the axis, and a plate spring for biasing the first link portion. Since the support member also serves as a member that contacts the leaf spring, the member that supports the link member so that the link member can move in the rotational direction about the axis and the leaf spring that biases the first link portion. Therefore, there is no need to separately provide a member that contacts the leaf spring, and the number of components can be reduced.

In the belt drive device of the present invention, the leaf spring may be arranged downstream of the first link portion in a direction in which the belt pulls the pulley.

With this configuration, the belt drive device of the present invention can be made smaller than, for example, a configuration in which the leaf spring is arranged upstream of the first link portion in the direction in which the belt pulls the pulley.

In the belt driving device of the present invention, the support member may be attached with a rail for guiding movement of the object moved by the belt.

With this configuration, the belt drive device of the present invention is provided with a member that supports the link member so that the link member can move in a rotational direction around the axis, and a rail that guides the movement of the object moved by the belt. Since the support member also serves as the member to be moved by the belt, the member that supports the link member so that the link member can move in the rotational direction around the axis, and the member to which the rail that guides the movement of the object moved by the belt is attached and the number of components can be reduced.

An inkjet printer of the present invention is characterized by comprising the belt driving device described above.

With this configuration, the inkjet printer of the present invention can reduce the number of components.

The belt drive and inkjet printer of the present invention can reduce the number of components.

1 is an external perspective view of an inkjet printer according to an embodiment of the present invention; FIG. 2 is a perspective view of a portion of the belt driving device of the inkjet printer shown in FIG. 1; FIG. Figure 3 is a plan view of a portion of the belt drive shown in Figure 2; Figure 3 is a front view of part of the belt drive shown in Figure 2; Figure 3 is a side view of a portion of the belt drive shown in Figure 2; FIG. 3 is an external perspective view of a link member shown in FIG. 2; (a) It is a top view of the link member shown in FIG. (b) It is a front view of the link member shown in FIG. (c) It is a side view of the link member shown in FIG. FIG. 3 is a plan view of a portion of the rail mounting member and the link member shown in FIG. 2; 2 is a block diagram of the inkjet printer shown in FIG. 1; FIG. FIG. 3 is a perspective view of part of the belt driving device shown in FIG. 2 when the pulley is attached to the link member; FIG. 3 is a plan view of part of the belt driving device shown in FIG. 2 when the pulley is attached to the link member; 3 is a side view of part of the belt driving device shown in FIG. 2 when the pulley is attached to the link member; FIG. 9A is a plan view of a link member having a shape different from that shown in FIG. 8; FIG. 13B is a plan view of a link member having a shape different from that shown in FIGS. 8 and 13A; FIG. (c) A plan view of a link member having a shape different from that shown in FIGS. 8, 13(a) and 13(b). FIG. 7 is an external perspective view of a link member different from the link member shown in FIG. 6;

An embodiment of the present invention will be described below with reference to the drawings.

First, the configuration of an inkjet printer according to this embodiment will be described.

FIG. 1 is an external perspective view of an inkjet printer 10 according to this embodiment.

As shown in FIG. 1, the inkjet printer 10 includes a platen 11 that supports a medium 90 from below in the vertical direction indicated by an arrow 10a, and a platen 11 that is arranged above the platen 11 in the vertical direction and is supported by the platen 11. A plurality of inkjet heads 12 for ejecting ink toward a medium 90 supported by a platen 11; A carriage 14 on which the device 13 is mounted, and a rail 15 extending in the left-right direction indicated by an arrow 10b orthogonal to the vertical direction (hereinafter referred to as "main scanning direction") for guiding the movement of the carriage 14 in the main scanning direction. and

The ink ejected by the inkjet head 12 is ink that cures when irradiated with light from the light irradiation device 13, and is UV ink, for example.

The light irradiation device 13 is, for example, a device that irradiates ultraviolet rays using an LED (Light Emitting Diode).

Carriage 14 constitutes the subject matter of the present invention.

FIG. 2 is a perspective view of part of the belt driving device 20 of the inkjet printer 10. As shown in FIG. FIG. 3 is a plan view of a portion of the belt drive device 20. FIG. FIG. 4 is a front view of part of the belt drive device 20. FIG. FIG. 5 is a side view of a portion of belt drive 20. As shown in FIG.

As shown in FIGS. 1 to 5, the inkjet printer 10 includes a belt driving device 20 that moves the carriage 14 in the main scanning direction.

The belt driving device 20 includes a belt 21, a pulley 22 rotated by transmission of the rotational motion of a motor 20a, which will be described later, to which the belt 21 is applied, and a pulley 23 on which the belt 21 is applied, and extends in the main scanning direction. A rail mounting member 24 to which the rail 15 is mounted, a shaft 25 extending vertically and fixed to the rail mounting member 24, and a link member 30 supporting the pulley 23 are provided. Belt 21 is stretched over pulleys 22 and 23 .

The belt 21 moves the carriage 14 which is fixed to the belt 21 itself, by the conveyance of the belt 21 itself. A portion of the inner peripheral surface of the belt 21 that contacts the outer peripheral surface of the pulley 22 is formed with teeth (not shown) for transmitting motion from the pulley 22 .

The pulley 22 has teeth (not shown) formed on its outer peripheral surface for transmitting motion to the belt 21 by meshing with teeth formed on the inner peripheral surface of the belt 21 .

The pulley 23 has a rotating shaft 23a extending in the vertical direction.

The rail mounting member 24 supports the link member 30 via the shaft 25 so that the link member 30 can move, that is, rotate, in the direction of rotation indicated by the arrow 30a about the shaft 25. It constitutes the support member of the invention. The rail mounting member 24 has a screw hole 24a.

The extending direction of the shaft 25 is parallel to both the extending direction of the rotating shaft of the pulley 22 and the extending direction of the rotating shaft 23 a of the pulley 23 . The shaft 25 is a swinging fulcrum of the link member 30 and constitutes a swing shaft of the link member 30 .

6 is an external perspective view of the link member 30. FIG. 7A is a plan view of the link member 30. FIG. 7B is a front view of the link member 30. FIG. FIG. 7(c) is a side view of the link member 30. FIG.

As shown in FIGS. 2 to 7, the link member 30 applies tension to the belt 21 via a rotation shaft support portion 31 that supports the rotation shaft 23a of the pulley 23 and the pulley 23 supported by the rotation shaft support portion 31. A tongue-like leaf spring 32 is provided as a biasing member for biasing the rotation shaft support portion 31 in order to apply the force. The rotating shaft support portion 31 and the leaf spring 32 are integrally formed.

The rotating shaft support portion 31 includes a shaft contact portion 31 a into which the shaft 25 is inserted and contacts the shaft 25 , and a rotating shaft contact portion 31 b that contacts the rotating shaft 23 a of the pulley 23 .

The leaf spring 32 is arranged downstream of the rotary shaft support portion 31 in the direction indicated by the arrow 10 d in the main scanning direction, that is, in the direction in which the belt 21 pulls the pulley 23 . The leaf spring 32 is curved and has a curved contact portion 32 a for contacting the rail mounting member 24 . One end 32b of the leaf spring 32 is a fixed end that is fixed to the rotating shaft support portion 31, and the other end 32c is a free end that is not fixed.

8 is a plan view of a portion of the rail mounting member 24 and the link member 30. FIG.

As shown in FIGS. 7A and 8, the plate spring 32 of the link member 30 contacts the rail mounting member 24 at the curved contact portion 32a, thereby rotating in the direction indicated by the arrow 30b in the direction of rotation indicated by the arrow 30a. It biases the rotation shaft support portion 31 in the direction of rotation.

The link member 30 constitutes a first-class lever having a shaft contact portion 31a as a fulcrum between a curved contact portion 32a as a point of force and a rotating shaft contact portion 31b as a point of action. Let P1 be the magnitude of the force with which the curved contact portion 32a as the point of force is pushed from the rail mounting member 24, and let P2 be the magnitude of the force with which the rotary shaft contact portion 31b as the point of action pushes the rotary shaft 23a of the pulley 23. The distance between the curved contact portion 32a as the fulcrum and the shaft contact portion 31a as the fulcrum is L1, and the distance between the rotating shaft contact portion 31b as the point of action and the shaft contact portion 31a as the fulcrum is L2. Then, the relationship P2/P1=L1/L2 is established.

In the link member 30, the portion extending from the shaft contact portion 31a as the fulcrum and provided with the rotating shaft contact portion 31b as the point of action is the link portion 30A as the first link portion of the present invention. In the link member 30, the portion extending from the axial contact portion 31a as the fulcrum and provided with the curved contact portion 32a as the force point is the link portion 30B as the second link portion of the present invention. The link member 30 is biased by the leaf spring 32 in a curved contact portion 32a as a point of force, thereby generating a stress in a rotating shaft contact portion 31b as a point of action, thereby generating a pulley supported by the link portion 30A. Tension is applied to belt 21 via 23 . That is, the link member 30 is biased by the leaf spring 32 to the curved contact portion 32a, so that the rotating shaft contact portion 31b acts on the pulley 23 to swing the pair of pulleys 22 and 23 away from each other. and tension is applied to the belt 21 .

In the link member 30, a straight line 30d as a first straight line connecting the fulcrum and the force point and a straight line 30e as a second straight line connecting the fulcrum and the action point intersect. The straight line 30d extends substantially parallel to the moving direction of the carriage 14 by the belt 21, that is, the main scanning direction.

FIG. 9 is a block diagram of the inkjet printer 10. As shown in FIG.

As shown in FIG. 9, the inkjet printer 10 includes a plurality of inkjet heads 12, a plurality of light irradiation devices 13, and an arrow 10c perpendicular to both the vertical direction and the main scanning direction (see FIG. 1). A medium conveying device 51 conveys a medium 90 (see FIG. 1) (hereinafter referred to as "sub-scanning direction"), and a platen 11 (see FIG. 1) along rails 15 (see FIG. 1) in the main scanning direction. ), an operation unit 53 which is an input device such as a button for inputting various operations, and an LCD (Liquid LCD) for displaying various information. a display unit 54, which is a display device such as a Crystal Display); It includes a storage unit 56 that is a nonvolatile storage device such as a semiconductor memory that stores information and a HDD (Hard Disk Drive), and a control unit 57 that controls the entire inkjet printer 10 .

The carriage scanning device 52 includes a belt driving device 20 (see FIG. 1) which is a drive source for driving the pulley 22 (see FIG. 1) and has a motor 20a for transmitting rotational motion to the pulley 22. there is

The control unit 57 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) storing programs and various data, and a RAM (Random Access Memory) used as a work area for the CPU. there is The CPU executes programs stored in the ROM or storage unit 56 .

Next, the operation of the inkjet printer 10 will be described.

Upon receiving the print data via the communication unit 55 , the control unit 57 executes printing on the medium 90 based on the print data received via the communication unit 55 . That is, the control unit 57 causes the carriage scanning device 52 to move the carriage 14 in the main scanning direction, causes the inkjet head 12 to eject ink toward the medium 90 , and directs the ink adhering to the medium 90 to the light irradiation device 13 . By applying light, printing is performed on the medium 90 in the main scanning direction. In addition, after executing printing on the medium 90 in the main scanning direction, the control unit 57 causes the medium conveying device 51 to convey the medium 90 in the sub-scanning direction as necessary, thereby performing printing on the medium 90 in the sub-scanning direction. After changing the position, printing is again performed on the medium 90 in the main scanning direction.

Here, movement of the carriage 14 by the carriage movement device 52 will be described in detail. When the motor 20a of the carriage moving device 52 transmits rotational motion to the pulley 22, the rotation of the pulley 22 causes the belt 21 to be conveyed. When the belt 21 is conveyed, the carriage 14 fixed to the belt 21 is guided by the rail 15 and moves in the main scanning direction.

It should be noted that the belt 21 expands and contracts under the influence of the ambient temperature, and elongates due to deterioration over time. In the belt driving device 20, even if the belt 21 expands and contracts, the action of the plate spring 32 moves the link member 30 in the direction of rotation indicated by the arrow 30a so that the belt 21 can always be tensioned.

Next, the operation for attaching the pulley 23 to the link member 30 will be described.

FIG. 10 is a perspective view of part of the belt driving device 20 when the pulley 23 is attached to the link member 30. FIG. FIG. 11 is a plan view of part of the belt driving device 20 when the pulley 23 is attached to the link member 30. FIG. FIG. 12 is a side view of part of the belt driving device 20 when the pulley 23 is attached to the link member 30. FIG.

As shown in FIGS. 10 to 12, an operator inserts the tip of the bolt 40 into the screw hole 24a of the rail mounting member 24, and then rotates the bolt 40 so that the bolt is inserted through the screw hole 24a of the rail mounting member 24. By changing the protrusion amount of the tip portion of bolt 40 and bringing the tip of bolt 40 into contact with link member 30, the biasing force of plate spring 32 is resisted and the direction of rotation indicated by arrow 30b about shaft 25 and the direction of rotation are changed. moves the link member 30 in the rotational direction indicated by the opposite arrow 30c. Next, the operator brings the rotating shaft 23a of the pulley 23, on which the belt 21 is hung, into contact with the rotating shaft contact portion 31b of the link member 30. As shown in FIG. By turning the bolt 40, the operator changes the amount of protrusion of the tip of the bolt 40 from the screw hole 24a of the rail mounting member 24, and separates the tip of the bolt 40 from the link member 30. The biasing force of the plate spring 32 moves the link member 30 in the direction of rotation about the shaft 25 as indicated by the arrow 30b. Finally, the operator removes the bolt 40 from the threaded hole 24a of the rail mounting member 24 by turning it. Accordingly, the belt driving device 20 is in the state shown in FIGS. 2 to 5. FIG.

Next, the operation for removing the pulley 23 from the link member 30 will be described.

As shown in FIGS. 10 to 12, an operator inserts the tip of the bolt 40 into the screw hole 24a of the rail mounting member 24, and then rotates the bolt 40 so that the bolt is inserted through the screw hole 24a of the rail mounting member 24. By changing the amount of protrusion of the tip portion of bolt 40 and bringing the tip of bolt 40 into contact with link member 30, the biasing force of plate spring 32 is resisted and the bolt rotates about shaft 25 in the direction indicated by arrow 30c. move the link member 30; Next, the worker removes the rotating shaft 23 a of the pulley 23 on which the belt 21 is hung from the rotating shaft contact portion 31 b of the link member 30 .

As described above, the bolt 40 should be used when the pulley 23 is attached to the link member 30 and when the pulley 23 is removed from the link member 30, in terms of workability. , but unnecessary at other times.

As described above, the belt driving device 20 applies tension to the belt 21 by means of the leaf spring 32 as a biasing member having one fixed end and a free end at the other end. ``A male screw that is fitted into a female screw that is arranged at a position fixed to the support member and pushes the compression coil spring in the direction in which the compression coil spring contracts'' is unnecessary, and the number of components can be reduced. can.

In particular, the belt driving device 20 applies tension to the belt 21 by means of a leaf spring 32 integrally formed with the rotary shaft support 31 instead of a conventional compression coil spring, thereby reducing the number of components. be able to.

The belt driving device 20 includes a member that supports the link member 30 so that the link member 30 can move in the rotational direction indicated by an arrow 30 a , and a plate spring 32 that biases the rotation shaft support portion 31 to the plate spring 32 . Since the rail mounting member 24 also serves as the contacting member, the member that supports the link member 30 so that the link member 30 can move in the rotational direction indicated by the arrow 30a and the plate spring 32 that biases the rotation shaft support portion 31. It is not necessary to separately provide a member that contacts the leaf spring 32 to allow the spring to be engaged, and the number of components can be reduced.

The belt driving device 20 includes a member that supports the link member 30 so that the link member 30 can move in the rotational direction indicated by an arrow 30a, and a carriage 14 that is fixed to the belt 21 and moved by the conveyance of the belt 21. Since the rail mounting member 24 also serves as a member to which the rail 15 that guides movement is mounted, the rail 15 is mounted to the member that supports the link member 30 so that the link member 30 can move in the rotational direction indicated by the arrow 30a. There is no need to separately provide the rail mounting member 24, and the number of components can be reduced.

Since the belt drive device 20 can reduce the number of components, the cost is reduced by reducing the total price of the components, and the work time for assembly and belt replacement is shortened. A reduction in cost can be realized.

Since the belt drive device 20 can reduce the number of components, it can be made smaller and lighter.

As shown in FIG. 8, the belt driving device 20 has a leaf spring 32 arranged downstream of the rotating shaft support portion 31 in the direction indicated by the arrow 10d in the main scanning direction, that is, the direction in which the belt 21 pulls the pulley 23. Therefore, it can be miniaturized. For example, as shown in FIG. 13(a), the belt driving device 20 has a configuration in which the leaf spring 32 is arranged upstream of the rotating shaft support portion 31 in the direction indicated by the arrow 10d. It can be made smaller. 13(b), the belt driving device 20 has a configuration in which a plate spring 32 is arranged upstream of the rotating shaft support portion 31 in the direction indicated by an arrow 10e in the sub-scanning direction, or As shown in (c), it is possible to reduce the size in the sub-scanning direction compared to the configuration in which the plate spring 32 is arranged downstream of the rotating shaft support portion 31 in the direction indicated by the arrow 10e. In the belt driving device 20, the plate spring 32 may not be arranged downstream of the rotating shaft support portion 31 in the direction indicated by the arrow 10d as shown in FIG. For example, the belt driving device 20 may have a leaf spring 32 arranged upstream of the rotating shaft support portion 31 in the direction indicated by an arrow 10d as shown in FIG. As shown in FIG. 13(c), the leaf spring 32 may be arranged upstream of the rotating shaft support portion 31 in the direction indicated by the arrow 10e. A plate spring 32 may be arranged on the downstream side of the .

As shown in FIGS. 8 and 13(a), the belt driving device 20 has a straight line 30d connecting the fulcrum and the force point extending in the moving direction of the carriage 14 by the belt 21, that is, substantially parallel to the main scanning direction. Therefore, the distance from the fulcrum to the force point can be lengthened while suppressing the belt driving device 20 itself from becoming large.

In general, leaf springs tend to have a relatively large spring constant compared to compression coil springs when rigidity and durability are taken into account. However, the belt driving device 20 can increase the distance from the fulcrum to the point of force while preventing the belt driving device 20 itself from becoming large. 32 spring constant can be reduced.

Since the belt driving device 20 can be miniaturized, the area occupied by the belt driving device 20 in the inkjet printer 10 can be reduced, and as a result, the freedom in designing the parts other than the belt driving device 20 in the inkjet printer 10 can be achieved. degree can be improved.

The link member 30 may have a shape other than the shape shown in this embodiment.

For example, in the present embodiment, the link member 30 is a first-class lever having a shaft contact portion 31a as a fulcrum between a curved contact portion 32a as a point of force and a rotating shaft contact portion 31b as a point of action. However, it is also possible to configure a second-class lever in which the point of action exists between the fulcrum and the point of force, or a third-class lever in which the point of force exists between the fulcrum and the point of action. may be configured.

Link member 30 moves in a rotational direction about axis 25 as indicated by arrow 30a. Therefore, in a state where the force of the rotating shaft contact portion 31b as the point of action pushing the rotating shaft 23a of the pulley 23 and the tension of the belt 21 are balanced, the shaft contact portion 31a as the fulcrum and the rotating shaft as the point of action are balanced. When the contact portion 31b and the contact portion 31b are aligned in the sub-scanning direction, even if the link member 30 moves in the rotation direction indicated by the arrow 30a when the length of the belt 21 slightly changes, the rotation axis as the point of action The contact portion 31b moves substantially in the main scanning direction. That is, the extending direction of the belt 21 is maintained substantially in the main scanning direction. Therefore, the positional relationship between the shaft contact portion 31a as the fulcrum and the rotation shaft contact portion 31b as the point of action is determined by the force of the rotation shaft contact portion 31b as the point of action pushing the rotation shaft 23a of the pulley 23 and the force of the belt 21. It is preferable that the shaft contact portion 31a as a fulcrum and the rotating shaft contact portion 31b as a point of action are aligned in the sub-scanning direction in a state in which the tension is balanced.

In the above description, the link member 30 has the leaf spring 32 as a biasing member. However, the urging member of the present invention may be other than leaf springs. For example, the link member of the present invention may be link member 130 shown in FIG. The structure of the link member 130 shown in FIG. 14 includes a plate portion 33 extending from the rotating shaft support portion 31 and a biasing member 34 fixed to the plate portion 33 by a method such as adhesion. 6) is provided in place of the plate spring 32. The biasing member 34 is, for example, a cushion such as an air cushion, or rubber. The biasing member 34 has a fixed end with a surface 34a as one end fixed to the plate portion 33, and a free end with a surface 34b as the other end that is not fixed. The plate portion 33 has a biasing member contact portion 33a that contacts the biasing member 34 as a force point.

The link member 130 shown in FIG. 14 has the biasing member 34 fixed to the plate portion 33 . However, the plate portion 33 may be biased by the biasing member 34 fixed to the rail mounting member 24 without the biasing member 34 being fixed to the plate portion 33 . In this configuration, the biasing member 34 has a free end where the surface 34a that contacts the biasing member contact portion 33a of the link member 130 is not fixed, and a fixed end where the surface 34b is fixed to the rail mounting member 24. Become.

The inkjet printer 10 is a UV printer in this embodiment, but may be an inkjet printer other than the UV printer.

In this embodiment, the inkjet printer 10 moves the medium 90 in the sub-scanning direction with respect to the inkjet head 12 by transporting the medium 90 in the sub-scanning direction with respect to the platen 11 . However, the inkjet printer 10 extends the platen 11 in the sub-scanning direction from that shown in FIG. By providing a mechanism for moving in the scanning direction, the inkjet head 12 may be moved in the sub-scanning direction with respect to the medium 90 .

Although the belt driving device of the present invention is provided in the two-dimensional printer in this embodiment, it may be provided in other devices. For example, the belt driving device of the present invention may be provided in a three-dimensional printer to drive a carriage on which an inkjet head is mounted, or may be provided in a cutting plotter to drive the cutting head in the cutting plotter. It's okay to be

10 inkjet printer 10b arrow (arrow indicating the direction of movement of the object by the belt)
10d arrow (arrow indicating the direction in which the belt pulls the pulley)
14 Carriage
15 rail 20 belt drive 20a motor (driving source)
21 belts 22, 23 pulleys (a pair of pulleys)
23a rotating shaft 24 rail mounting member (supporting member)
25 shaft 30 link member 30A link portion (first link portion)
30B link part (second link part)
30a Arrow (Arrow indicating the swing direction with the swing axis parallel to the rotation axis as the fulcrum)
30d straight line (first straight line)
30e straight line (second straight line)
31a Shaft contact part (fulcrum)
31b Rotating shaft contact part (point of action)
32 leaf spring (biasing member)
32a Curved contact portion (force point)
32b end (one end)
32c end (other end)
33a Biasing member contact portion (force point)
34 biasing member 34a surface (one end)
34b face (other end)

Claims (8)

a pair of pulleys;
a belt stretched over the pair of pulleys;
A belt drive device comprising a drive source for driving one of the pair of pulleys,
a link member that swings about a swing axis parallel to the rotation axis of the pair of pulleys;
a support member that supports the link member so that the link member can swing with respect to the fulcrum;
The link member is
a first link portion extending from the fulcrum and provided with a point of action;
a second link portion extending from the fulcrum and provided with a force point,
One end of the link member is a fixed end and the other end is a free end. By urging the point of force by the urging member, the point of action acts on the pulleys to pulleys oscillate away from each other to apply tension to the belt ;
In the link member, a first straight line connecting the fulcrum and the force point and a second straight line connecting the fulcrum and the point of action intersect, and the object moved by the belt is moved in the direction of the belt. , wherein the first straight line extends substantially parallel to the belt driving device. 2. The belt driving device according to claim 1, wherein the link member supports the rotating shaft of one of the pair of pulleys at the point of action. The second link portion includes a tongue-shaped leaf spring as the biasing member,
3. The belt driving device according to claim 1, wherein the force point is provided on the free end side of the leaf spring. The second link portion includes a leaf spring provided with the force point as the biasing member,
3. The belt drive device according to claim 1, wherein the first link portion and the second link portion are integrally formed. 5. The belt drive device according to claim 4, wherein the leaf spring biases the first link portion by contacting the support member. 6. The belt driving device according to claim 4, wherein the leaf spring is arranged downstream of the first link portion in a direction in which the belt pulls the pulley. 7. The belt driving device according to any one of claims 4 to 6, wherein said support member is attached with a rail for guiding movement of an object moved by said belt. An inkjet printer comprising the belt driving device according to any one of claims 1 to 7.

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