JP2013234915A - Pointer movement unit and pointer instrument apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pointer movement unit capable of quickly detecting a failure caused by a defect concerned with a linear member to which a pointer is attached and notifying the failure, and to provide a pointer instrument apparatus including the pointer movement unit.SOLUTION: A pointer movement unit 10 included in a speed meter 1 notifies occurrence of a failure when determining that a first reel 52 stored in a storage case 5 is not rotated in a state that a second reel 6 is rotated so as to wind up or send out a wire 4 to which a pointer 3 is attached.

Description

  The present invention relates to a pointer movement unit used in a pointer instrument device mounted on a moving body such as a vehicle or a ship, and a pointer instrument device having the pointer movement unit.

  A moving body such as a vehicle or a ship is equipped with a pointer instrument device that displays information measured by various measuring means to passengers of the moving body. Examples of this kind of pointer instrument device include a speedometer that displays the speed of a vehicle as a moving body, a tachometer that displays the engine speed, and a fuel gauge that displays the remaining amount of fuel.

  As such a pointer instrument device, for example, a pointer-type instrument disclosed in Patent Document 1 (indicated by reference numeral 801 in FIG. 15) is arranged behind a dial 805 and a central opening 805a of the dial 805. A liquid crystal display 807 and a pointer 811 for indicating a scale portion 809 including a plurality of scale lines arranged in an arc shape on the dial 805.

  As shown in FIG. 16, the pointer-type meter 801 is provided with a pointer moving unit 813 that moves the pointer 811 along the scale portion 809. As shown in FIG. 17, the pointer moving unit 813 includes an arcuate guide portion 813a, a feeding mechanism portion 813b provided on one end side of the guide portion 813a, and a winding provided on the other end side of the guide portion 813a. A take-off mechanism portion 813c.

  The feeding mechanism portion 813b has a wire case 813g. A wire 813i as a linear member is fed out from the wire case 813g. The wire 813i has appropriate tensile strength and flexibility. One end of the wire 813i is attached to a supply-side reel (not shown) housed in the wire case 813g. In addition, a part on one end side of the wire 813i is wound around the supply-side reel. The supply-side reel is urged by a spiral spring (not shown) in the direction of winding the wire 813i inside the wire case 813g.

  The take-up mechanism 813c has a take-up reel 813j and a stepper motor 813k. The tip of a wire 813i is attached to the take-up reel 813j. Further, the portion on the tip end side of the wire 813i is wound around the take-up reel 813j. The take-up reel 813j is attached to the output shaft of the stepper motor 813k.

  As described above, the wires 813i whose both ends are respectively attached to the feeding mechanism portion 813b and the winding mechanism portion 813c are each guide roller of the guide portion 813a between the feeding mechanism portion 813b and the winding mechanism portion 813c. 813f. Further, the wire 813i is attached to the slider 813e between the feeding mechanism portion 813b and the winding mechanism portion 813c. The pointer 811 is attached to the slider 813e via the attachment 815.

  In the pointer type instrument 801, when the wire 813i moves between the feeding mechanism portion 813b and the winding mechanism portion 813c, the attachment 815 and the pointer 811 together with the slider 813e are moved between the feeding mechanism portion 813b and the winding mechanism portion 813c. Moving. With this movement, the pointer 811 indicates the scale line of the scale unit 809 shown in FIG. The pointer-type meter 801 is provided with mechanisms 817 and 815c for detecting that the pointer 811 has passed a predetermined detection point whose relative position with respect to the origin of the pointer 811 is known. The point (origin) was adjusted.

JP 2010-243286 A

  However, in the pointer-type meter 801 as described above, for example, when the wire 813i is disconnected, the pointer 811 becomes immobile, but there is a problem that a failure due to such disconnection cannot be detected quickly. . Specifically, the pointer-type meter 801 is provided with a mechanism for detecting that the pointer 811 has passed a predetermined detection point. In order to detect the failure using such a mechanism, Since the wire 813i needs to be wound or unwound at least as long as the pointer 811 reliably passes the detection point, there is a problem that it takes time to detect a failure. Further, there is another problem that the wire 813i is entangled with each reel by winding or unwinding the wire 813i when the wire 813i is disconnected. Even when the wire 813i has a slack that cannot be taken up by the take-up reel, a failure due to such a slack cannot be detected quickly as in the case of the disconnection described above.

  The present invention aims to solve this problem. That is, an object of the present invention is to provide a pointer moving unit capable of quickly detecting and notifying a failure due to a failure related to a linear member to which a pointer is attached, and a pointer instrument device having the pointer moving unit.

  In order to achieve the above object, the invention described in claim 1 is a pointer moving unit that moves a pointer so as to indicate an index provided on the dial according to a measurement amount, A flexible linear member disposed along the indicator arrangement direction, to which the pointer is attached, one end reel to which one end of the linear member is attached, and the other end of the linear member are attached. The other end side reel, a rotational force applying member that applies a rotational force to the one end side reel so as to wind up the slack of the linear member, and the winding direction of the linear member or the direction of feeding out the linear member A rotation drive unit for rotating the other end side reel, a rotation drive control means for controlling the rotation drive unit to rotate the other end side reel according to the measured amount, and whether the one end side reel is rotating Times to determine whether In the state in which the rotation driving unit is controlled to rotate the other end side reel by the determination unit and the rotation drive control unit, the rotation determination unit determines that the one end side reel is not rotating. And a failure notification means for notifying that a failure has occurred.

  According to a second aspect of the present invention, in the first aspect of the present invention, a mark portion including a predetermined mark is provided at a position where the one end side reel rotates with the rotation thereof, and the rotation determination is performed. The means is disposed opposite to a part of the trajectory in which the mark moves, and outputs a signal corresponding to the presence or absence of the mark in the part, and based on the signal output by the mark sensor part Signal determining means for determining whether or not the one end side reel is rotating.

  In order to achieve the above object, the invention described in claim 3 is a pointer, a dial provided with an index indicated by the pointer, and the pointer so as to indicate the index according to a measurement amount. A pointer instrument device having a pointer moving unit for moving the pointer, wherein the pointer moving unit comprises the pointer moving unit according to claim 1 or 2.

  According to the first aspect of the present invention, the one-end-side reel is not rotated in a state where the other-end-side reel is rotated so as to wind or feed out the linear member to which the pointer is attached. When judged, it notifies that a failure has occurred. For example, when the linear member is normal without disconnection or slack, the rotation of the other end side reel is transmitted to the one end side reel through the linear member, that is, when the other end side reel is rotated, the one end side reel is simultaneously rotated. It is rotated. On the other hand, when the linear member has a defect such as disconnection or slack, the rotation of the other end side reel is not transmitted to the one end side reel, that is, even if the other end side reel is rotated, the one end side reel is not simultaneously rotated. . Therefore, it is possible to detect a failure by determining that the one-end reel is not rotating in a state where the other-end reel is rotating, thereby quickly detecting a failure due to a problem related to the linear member. Can be notified.

  According to the second aspect of the present invention, a mark portion including a predetermined mark is provided at a portion that rotates in accordance with the rotation of the one-end reel, and a portion of the track on which the mark moves is opposed. It is determined whether or not the one-end reel is rotating based on a signal corresponding to the presence or absence of the mark in the portion output by the mark sensor unit arranged in the The presence can be detected by the mark sensor unit, and it can be directly determined whether or not the one-end side reel is rotating. Therefore, the failure can be detected with high accuracy.

  According to the invention described in claim 3, since the pointer moving unit is configured by the pointer moving unit according to any one of claims 1 to 3, the other end side reel is being rotated. In this case, it is possible to detect a failure by determining that the one-end reel is not rotating, thereby quickly detecting and notifying a failure due to a problem related to the linear member.

It is a disassembled perspective view which shows the pointer instrument apparatus (speedometer) which concerns on one embodiment of this invention. It is a perspective view which shows the pointer movement unit which the speedometer of FIG. 1 has. FIG. 3 is an exploded view of the pointer moving unit of FIG. 2. It is a disassembled perspective view which shows the accommodation case shown in FIG. 3, each member accommodated in it, and a pair of mark sensor part arrange | positioned on the outer side. FIG. 5 is an exploded perspective view showing the housing case shown in FIG. 3, each member housed in the housing case, and a pair of mark sensor units arranged on the outside thereof, from an angle different from FIG. 4. It is a front view of the baseplate of a 1st reel. FIG. 3 is an enlarged perspective view of the pointer moving unit of FIG. 2 in which the vicinity of a first attachment portion of the frame is viewed from below in FIG. 2. It is sectional drawing in the 1st attaching part of the pointer movement unit of FIG. It is a perspective view of the cross section of the structure which combines the accommodation case shown in FIG. 3, each member accommodated in it, and a pair of mark sensor part arrange | positioned on the outer side. It is a perspective view which shows the length adjustment part which the 2nd reel shown in FIG. 3 has. It is a top view of the length adjustment part of FIG. It is a perspective view which shows the structure of the modification of the 2nd reel shown in FIG. It is a functional block diagram which shows the electrical structure of the speedometer of FIG. 1, and its peripheral part. It is a flowchart which shows an example of the process (pointer movement process) which concerns on this invention in CPU with which the control part shown in FIG. 13 is provided. It is a front view of the conventional pointer type instrument. It is sectional drawing of the pointer type meter of FIG. It is a perspective view of the pointer drive unit with which the pointer type meter of FIG. 15 is provided.

  Hereinafter, a speedometer as an instrument device according to an embodiment of the present invention will be described with reference to FIGS.

  A speedometer 1 shown in FIG. 1 is a device that is attached to an instrument panel or the like of a car as a moving body and displays the speed of the car to an occupant of the car.

  The speedometer 1 includes a dial 2 provided with a scale portion 21, a pointer 3 that instructs the scale portion 21 according to a measurement amount, a pointer moving unit 10 that moves the pointer 3, and the pointer moving unit 10. And a case 9 provided in a substantially semicircular box shape in plan view.

  The dial 2 is formed in a semicircular plate shape whose outer shape is substantially the same as that of the case 9 in plan view, and a through window 22 formed in a substantially semicircular shape in plan view is provided at the center. That is, the dial 2 is formed in a substantially semicircular ring shape in plan view. On the front surface of the dial plate 2 (surface directed toward the passenger compartment), there is provided a scale portion 21 including a plurality of scale lines 21a and numerical values 21b as indices printed along an arcuate portion at the inner edge thereof. It has been. That is, the scale portion 21 is provided on the front surface of the dial 2 so as to extend in an arc shape. The dial 2 is attached to the case 9 so as to close the opening of the case 9. In the case 9, a liquid crystal display (not shown) for displaying various kinds of information is arranged at a location behind the through window 22 of the dial 2.

  The pointer 3 is formed in a cone shape that gradually becomes thinner from one end in the longitudinal direction toward the other end. One end of the pointer 3 that is formed wide is attached to a slider 30 of a pointer moving unit 10 to be described later. The pointer 3 attached to the slider 30 is passed through the through window 22 of the dial 2. As a result, the pointer 3 is positioned on the front side of the dial 2 so as to be visually recognized, and the slider 30 is positioned on the back side of the dial 2 so as not to be viewed. The pointer 3 is moved by the pointer moving unit 10 along the extending direction of the scale portion 21 (that is, the arrangement direction of the scale lines 21a).

  As shown in FIGS. 2 to 5, the pointer moving unit 10 includes a slider 30 to which the one end of the pointer 3 is attached, and a flexible portion connected to the slider 30 by being wound around the protruding portion 31 of the slider 30. Wire 4 as a linear member having the properties, a first reel 52 as a one-end reel around which one end 4a of the wire 4 is wound, and a storage case as a holding member that rotatably stores the first reel 52 5, a second reel 6 as the other end-side reel around which the other end 4 b side of the wire 4 is wound, and a spring as a rotational force applying member that applies a rotational force to the first reel 52 so as to wind up the slack of the wire 4. 7, a spring cover 59 attached to the first reel 52, a pair of mark sensor units 60 for detecting the rotation state of the first reel 52, and the second reel 6 as a measurement amount. And a motor 8 as a rotational drive unit that winds the wire 4 around the second reel 6 by rotating the wire 4 or unwinds the wire 4 from the second reel 6 and moves the wire 4 along its longitudinal direction. A plurality of guide pulleys 12 provided between the case 5 and the second reel 6 and defining the movement trajectory of the wire 4, the slider 30, the housing case 5, the second reel 6, the motor 8, and the plurality of guide pulleys 12. , And a control unit 70 that controls the operation of the pointer moving unit 10.

  The frame 11 is made of a synthetic resin, and as shown in FIG. 3, the frame 11 is provided on a straight portion 11a formed in a straight strip shape and at one end of the straight portion 11a (the left end in FIG. 3). A first attachment portion 11b for attaching the housing case 5, a second attachment portion 11c for attaching the second reel 6 and the motor 8 provided at the other end (the right end in FIG. 3) of the linear portion 11a, and a first attachment. An arcuate guide pulley mounting portion 11d having one end connected to the portion 11b and the other end connected to the second mounting portion.

  The slider 30 is a member slidably provided on the guide pulley attachment portion 11d of the frame 11 from the end portion on the first attachment portion 11b side to the end portion on the second attachment portion 11c side.

  The wire 4 is a linear member having flexibility, and has appropriate tensile strength and flexibility. The wire 4 is a string having a round cross section formed of cotton yarn or the like. The wire 4 is preferably made of an insulating material such as cotton, hemp, chemical fiber, or synthetic resin. The shape of the wire 4 is not limited to a string shape with a round cross section, and may be a string shape with a rectangular cross section or a belt shape.

  The housing case 5 is made of a synthetic resin. As shown in FIGS. 4 and 5, the case main body 51 is formed in a box shape having a circular shape in plan view, and the case main body 51 is fitted into the case main body 51. And a lid 53 that closes an opening provided in the main body 51. 7 to 9 show the positional relationship between the housing case 5, each member (the first reel 52, the spring 7, and the spring cover 59) housed in the housing case 5 and a pair of mark sensor units 60 arranged on the outside thereof.

  The case main body 51 is provided on a plate-shaped bottom plate 54 formed in a circular shape in plan view, a cylindrical peripheral wall 55 erected from the outer edge of the bottom plate 54, and an edge portion of the peripheral wall 55 away from the bottom plate 54. In addition to the first concave portion 55 a that is concave from the edge portion, a cylindrical central column 56 that is erected from the center of the bottom plate 54 in the same direction as the peripheral wall 55, and the spring 7 that is provided on the outer peripheral surface of the central column 56 And a slit 56a for inserting the end 7b.

  The bottom plate 54 of the case main body 51 is provided with a pair of bottom plate through holes 54a and 54b so as to sandwich the central column 56 therebetween. Of the pair of bottom plate through-holes 54a and 54b, one bottom plate through-hole 54a is disposed near the center column 56, and the other bottom plate through-hole 54b is disposed near the peripheral wall 55.

  The lid 53 is provided in the shape of a circular plate in plan view. A second recessed portion 53 a that is recessed from the edge portion is provided at an edge portion of the lid 53 that contacts the case main body 51. The second recess 53a is overlapped with the first recess 55a when the lid 53 is fitted into the case body 51, and communicates between the inside and the outside of the housing case 5 (see FIG. 3). ). The wire 4 is movably passed through the wire through hole 13.

  The first reel 52 is made of a synthetic resin, and has a circular center through which the central plate 56 provided at the center of the bottom plate 57 and the bottom plate 57 overlaid on the bottom plate 54 of the case body 51 passes. A column-shaped through hole 57a, a cylindrical peripheral wall 58 erected from the outer edge of the bottom plate 57, a slit 58a for inserting one end 7a of the spring 7 provided on the peripheral wall 58, and a wire 4 provided on the peripheral wall 58 Through-holes 58b through which the.

  On the surface of the bottom plate 57 of the first reel 52 on the bottom plate 54 side of the case main body 51 (hereinafter referred to as “outer surface 57b”), as shown in FIG. Inner mark portions 57c and outer mark portions 57d, in which the marks W are alternately arranged along the entire circumference in the circumferential direction, are provided. The inner mark portion 57c is disposed near the center of the outer surface 57b, and the outer mark portion 57d is disposed near the outer edge of the outer surface 57b.

  A part of the inner mark portion 57c is arranged to face one bottom plate through hole 54a of the bottom plate 54 of the case body 51, and the black mark B of the inner mark portion 57c and the black mark B of the inner mark portion 57c are arranged along with the rotation of the first reel 52. The white marks W alternately pass through the bottom plate through holes 54a. Further, a part of the outer mark portion 57d is arranged to face the other bottom plate through hole 54b of the bottom plate 54 of the case body 51, and the black mark of the outer mark portion 57d is accompanied with the rotation of the first reel 52. B and white mark W alternately pass through the bottom plate through-holes 54b. That is, the bottom plate through-holes 54a and 54b are arranged to face a part of the trajectory along which the black mark B and the white mark W (one of them corresponds to the mark in the claims) of the mark portions 57c and 57d move. Has been.

  The wire 4 described above is positioned in the housing case 5 through the wire through hole 13 at the end 4 a side, and is wound around the peripheral wall 58 of the first reel 52. The winding amount of the wire 4 is set to a length equal to or longer than the moving amount of the pointer 3 in a state where the pointer 3 is positioned at a position indicating “0” of the numerical value 21 b of the scale portion 21. The one end 4a is drawn into the first reel 52 through the through hole 58b, and is attached to the first reel 52 without being pulled out of the through hole 58b by providing a knot on the one end 4a. .

  Then, the first reel 52 rotates clockwise about the central column 56 in the paper plane direction of FIG. 4, whereby the wire 4 is drawn into the housing case 5 and wound around the first reel 52. On the contrary, by pulling the wire 4 out of the housing case 5, the first reel 52 rotates counterclockwise around the central column 56.

  The spring 7 is made of a metal member such as stainless steel and is formed in a strip shape. The spring 7 is housed inside the peripheral wall 58 of the first reel 52 in a state of being spirally wound counterclockwise around the other end 7b in the longitudinal direction. Then, one end portion 7a in the longitudinal direction, which is positioned on the radially outer side of the spring 7 wound in a spiral shape as described above, is drawn out from the slit 58a to the outside of the peripheral wall 58, and is formed on the outer surface of the peripheral wall 58. The other end 7 b is attached to the central column 56 by being inserted into the slit 56 a of the central column 56 through the central column through hole 57 a of the first reel 52. Then, the spring cover 59 formed in a substantially disc shape with synthetic resin is attached to the first reel 52, so that the spring 7 is accommodated in the space formed by the first reel 52 and the spring cover 59.

  As described above, the spring 7 attached to the first reel 52 and the housing case 5 is rotated when the first reel 52 rotates in the direction in which the wire 4 is pulled out from the housing case 5, that is, the first reel 52 rotates counterclockwise as described above. When the first end portion 7a is rotated counterclockwise, the one end portion 7a moves counterclockwise together with the first reel 52, so that the number of turns increases and the amount of bending increases, generating a force to return to the original shape, that is, an elastic restoring force. Then, due to this elastic restoring force, the spring 7 urges the first reel 52 to rotate in the direction in which the wire 4 is wound, that is, in the clockwise direction. That is, the spring 7 applies a rotational force to the first reel 52 so as to wind up the slack of the wire 4.

  The pair of mark sensor units 60 receives a light component reflected by the object out of the light emitted from the light emitting element 60a that emits light toward the object and the light emitting element 60a, and a signal corresponding to the amount of light received. It is comprised with the reflection type photosensor which has the light receiving element 60b which outputs (refer FIG. 13). As shown in FIG. 9, the pair of mark sensor units 60 includes a part of the inner mark part 57 c and a part of the outer mark part 57 d through a pair of bottom plate through holes 54 a and 54 b provided in the bottom plate 54 of the case body 51. Opposed to each other. For convenience of explanation, FIG. 9 shows the bottom plate 54 of the case body 51 as seen through.

  In the pair of mark sensor parts 60, each light emitting element 60a emits light toward the inner mark part 57c and the outer mark part 57d, and each light receiving element 60b is reflected by the inner mark part 57c and the outer mark part 57d. Receive light. And since the intensity of the light reflected by the black mark B and the white mark W is different in each mark part 57c, 57d, the part which exists in a pair of bottom-plate through-holes 54a, 54b in each mark part 57c, 57d A signal corresponding to the black mark B or the white mark W is output from the light receiving element 60b. The pair of mark sensor units 60 is supported by a relay substrate 75 fixed to the frame 11 and is connected to a control unit 70 described later via the relay substrate 75.

  The second reel 6 is made of a synthetic resin, and has a reel body 61 and a length adjuster 62 as shown in FIG.

  The reel main body 61 has a plate-like bottom plate 63 provided in an annular shape in plan view, a cylindrical peripheral wall 64 erected from the outer edge of the bottom plate 63, and an edge portion of the peripheral wall 64 away from the bottom plate 63. A cutout 64a through which the wire 4 is passed, and a cylindrical output shaft mounting portion 65 that is erected from the inner edge of the bottom plate 63 in the same direction as the peripheral wall 64 and to which the output shaft 81 of the motor 8 is mounted. And a pair of columnar locking pillars 66 erected in the same direction as the output shaft mounting portion 65 from the bottom plate 63. Further, the output shaft 81 of the motor 8 is press-fitted inside the output shaft attachment portion 65 and attached to the output shaft attachment portion 65.

  As shown in FIGS. 10 and 11, the length adjusting unit 62 includes a plate-like bottom plate 67 provided in a ring shape in plan view, a cylindrical peripheral wall 68 erected from the outer edge of the bottom plate 67, and A through hole 68a through which the wire 4 is provided in the peripheral wall 68, and a cylindrical output shaft mounting portion through which the output shaft mounting portion 65 is erected from the inner edge of the bottom plate 67 in the same direction as the peripheral wall 68 are passed. Part 69, and the bottom plate 67 has six locking column passage holes 67 a provided so as to surround the output shaft attachment part passage part 69.

  The length adjusting unit 62 is housed between the peripheral wall 64 of the reel body 61 and the output shaft mounting portion 65, and the output shaft mounting portion 65 is passed inside the output shaft mounting portion through portion 69. The locking column 66 is passed through the locking column passage hole 67 a and attached to the reel body 61.

  Further, the above-described wire 4 is positioned on the inner side of the peripheral wall 64 of the reel body 61 through the notch 64 a through the notch 64 a, and is wound around the peripheral wall 68 of the length adjusting unit 62. The winding amount of the wire 4 is a length at which the wire 4 stretched between the first reel 52 and the reel body 61 does not sag, that is, the extra length of the wire 4. In other words, the winding amount of the wire 4 is such a length that the rotational force by the spring 7 is applied to the first reel 52 and tension is applied to the wire 4 (the wire 4 is in a tensioned state). is there. In addition, the other end 4b is drawn through the through hole 68a into the length adjusting unit 62, and a knot is provided on the other end 4b so that the other end 4b does not come out of the through hole 68a. It is attached.

  Further, the six locking column passage holes 67a are two locking columns among the six locking column passage holes 67a that are opposed to each other with the output shaft attachment portion passage portion 69 positioned therebetween. The locking pillar 66 is passed through the through hole 67a. The two locking column passage holes 67a through which the locking columns 66 pass are selected according to the above-described extra length of the wire 4.

  Thus, in this invention, since it has the length adjustment part 62 which winds the excess length part of the wire 4, and a pair of locking pillar 66, between the speedometers 1 from which the size of the dial 2 differs. The common wire 4 can be used, and the cost can be reduced by the mass production effect.

  The motor 8 is composed of, for example, a well-known stepping motor, and has an output shaft 81 that is rotated in accordance with an input control signal. As shown in FIG. 3, the motor 8 is attached to the second attachment portion 11c by being screwed thereto, and the output shaft 81 thereof is passed through the output shaft through hole 82 provided in the second attachment portion 11c. Then, the output shaft 81 is fixedly attached to the output shaft attaching portion 65 as described above, whereby the above-described second reel 6 is attached to the second attaching portion 11c. The rotation center axis of the second reel 6 and the rotation center axis of the first reel 52 are provided in parallel to each other. The motor 8 is connected to a control unit 70 described later.

  The second reel 6 connected to the motor 8 described above winds the wire 4 in such a manner that the wire 4 is wound around the peripheral wall 64 by rotating the output shaft 81 counterclockwise in the paper surface direction of FIG. take. As a result, the slider 30 is moved to the second reel 6 side, and the wire 4 is pulled out from the housing case 5. On the contrary, when the output shaft 81 rotates clockwise, the wire 4 wound around the peripheral wall 64 is sent out from the second reel 6 to the first reel 52 side.

  The plurality of guide pulleys 12 are rotatably attached to the guide pulley attaching portion 11d at intervals. These guide pulleys 12 position the wire 4 on the outer peripheral surface and rotate according to the movement of the wire 4, thereby moving the wire 4 along the extending direction of the scale portion 21 with a small frictional resistance.

  The control unit 70 is configured by, for example, a microcomputer for use in an embedded device, and includes a central processing unit (CPU) (not shown), a ROM that stores a control program, and a RAM that is used as a work area. And an external interface unit.

  FIG. 13 is a functional block diagram showing an electrical configuration of the speedometer 1 (the motor 8, the pair of mark sensor units 60, the control unit 70) and the peripheral portions thereof.

  In the control unit 70, the motor 8, the pair of mark sensor units 60, and the speed sensor S for measuring the vehicle speed are connected to the CPU via the external interface unit. Although only one mark sensor unit 60 is illustrated in FIG. 13, the other mark sensor unit 60 is similarly connected to the control unit 70. Further, in the control unit 70, an electronic control unit E mounted on a vehicle (not shown) is connected to the CPU via an external interface unit, and for example, between the control unit 70 and the electronic control unit E, for example, the control unit Speed information detected at 70, information indicating a failure of the speedometer 1 (failure information), and the like are transmitted and received.

  In addition, an ignition switch IGN is connected to the control unit 70 via an external interface unit, and the on / off state of the ignition switch IGN can be detected by the CPU. The control unit 70 is constantly supplied with stabilized power from a power source 76 connected to a battery B (not shown) of the vehicle. The control unit 70 is configured to supply power for operation to the motor 8 and the pair of mark sensor units 60 only when the ignition switch IGN is on.

  Next, the operation (pointer movement processing) according to the present invention of the speedometer 1 configured as described above will be described with reference to the flowchart of FIG.

  When the ignition switch IGN of the vehicle is turned on, the control unit 70 of the speedometer 1 performs a predetermined initialization process and supplies power to the motor 8 and the pair of mark sensor units 60 according to the turning on of the ignition switch. Is done. Then, the CPU of the control unit 70 (hereinafter simply referred to as “CPU”) advances the process to step S110 of the pointer movement process shown in FIG. 14 at a predetermined timing (for example, every second).

  In step S110, the speed of the vehicle is measured. Specifically, the CPU measures the pulse interval time of the travel pulse signal output every time the unit travels from the speed sensor S, and determines the current speed based on the pulse interval time and the unit travel distance. measure. Then, the process proceeds to step S120.

  In step S120, the motor 8 is rotated according to the measured amount of speed. Specifically, the CPU generates a drive control signal corresponding to the measured amount of speed measured in step S <b> 110 and transmits it to the motor 8. Thereby, the motor 8 rotates the output shaft 81 according to the measured amount of speed, and the second reel 6 is rotated accordingly. When the second reel 6 is rotated, the wire 4 is wound or fed out. Then, the process proceeds to step S130.

  In step S130, the rotation state of the first reel 52 is detected. Specifically, the CPU drives the light emitting element 60a included in the pair of mark sensor units 60 to emit light to the inner mark unit 57c and the outer mark unit 57d through the bottom plate through holes 54a and 54b. At the same time, the CPU monitors the change state of the signal output from the light receiving element 60b included in the pair of mark sensor units 60. Then, the process proceeds to step S140.

  In step S140, it is determined whether or not the first reel 52 is rotating. Specifically, the CPU changes the signal output from the light receiving element 60b included in the pair of mark sensor units 60 monitored in step S130 to indicate the rotation of the first reel (that is, the amount of received light). , And a signal indicating that light is reflected (reflection of light by the black mark B) and a signal indicating that it is large (reflection of light by the white mark W) appear alternately, and the first reel 52 is rotated. When the change shown is made, the processing of this flowchart is terminated (N in S140) assuming that the wire 4 is operating normally without disconnection or slack, and the change indicating the rotation of the first reel 52 is made. If not, the first reel 52 is not rotating, and it is determined that a failure such as disconnection or looseness of the wire 4 has been detected, and the process proceeds to step S150 (Y in S140).

  In step S150, the failure of the speedometer 1 is notified. Specifically, the CPU transmits information indicating a failure of the speedometer 1 to the electronic control unit E connected through the external interface unit. When receiving this information, the electronic control unit E notifies the driver, for example, that the speedometer 1 is out of order. And the process of this flowchart is complete | finished.

  Step S120 described above corresponds to the rotation drive control means in the claims, step S140 corresponds to a part of the rotation determination means (that is, the signal determination means) in the claims, and step S150 corresponds to the claims. Corresponds to the failure notification means. That is, the control unit 70 (specifically, the CPU) functions as a rotation drive control unit and a failure notification unit. Further, the control unit 70 and the pair of mark sensor units 60 function as rotation determination means.

  Next, an example of operation | movement in the speedometer 1 of this embodiment is demonstrated.

  The speedometer 1 measures the speed of the vehicle (S110), and rotates the output shaft 81 of the motor 8 according to the measured amount of speed (S120), thereby rotating the second reel 6 to wire 4 is moved along its longitudinal direction.

  Then, for example, when the second reel 6 rotates counterclockwise, the pointer 3 attached to the slider 30 changes “160” from the position side indicating “0” of the scale portion 21 shown in FIG. Move toward the indicated position. Further, as the second reel 6 rotates clockwise, the pointer 3 moves from the position side indicating “160” of the scale portion 21 toward the position side indicating “0”. Further, since the wire 4 has one end 4a attached to the first reel 52 to which the rotational force is applied by the spring 7 as described above, the pointer 3 indicates the position “160” of the scale portion 21. When moving from the side toward the position indicating “0”, the reel is wound around the first reel 52 without causing slack.

  That is, when the second reel 6 is rotated by the motor 8, the rotation of the second reel 6 is transmitted to the first reel 52 through the wire 4, and the first reel 52 rotates. Thereby, it is determined that the first reel 52 is rotating in a state where the motor 8 is controlled to rotate the second reel 6 (N in S130 and S140), and there is no failure such as disconnection in the wire 4. The normal operation is detected, and the speed display operation in the speedometer 1 is continued.

  Further, when the wire 4 is disconnected, the rotation of the second reel 6 is not transmitted to the first reel 52 through the wire 4, so the first reel 52 does not rotate. As a result, it is determined that the first reel 52 is not rotating in a state where the motor 8 is controlled to rotate the second reel 6 (Y in S130 and S140), a failure is detected, and the electronic control unit E is detected. And the driver is notified of the failure of the speedometer 1 through the electronic control unit E (S150). A failure is detected in the same manner when the wire 4 is slack.

  The speedometer 1 described above indicates the dial 3, the dial 2 provided with the scale portion 21 including the scale line 21a and the numerical value 21b indicated by the pointer 3, and the scale portion 21 according to the measurement amount. And a pointer moving unit 10 for moving the pointer 3. The pointer moving unit 10 moves the pointer 3 so as to instruct the scale line 21a and the numerical value 21b provided on the dial 2 according to the measurement amount. The pointer moving unit 10 includes a flexible wire 4 to which the pointer 3 is attached and a first end 4a to which the end 4a of the wire 4 is attached, which is disposed along the arrangement direction of the scale lines 21a of the scale portion 21 of the dial 2. The reel 52, the second reel 6 to which the other end 4b of the wire 4 is attached, the spring 7 that applies a rotational force to the first reel 52 so as to wind up the slack of the wire 4, and the direction or wire in which the wire 4 is wound up 4, a motor 8 that rotates the second reel 6 in the direction of feeding out 4, a rotation drive control means (control unit 70) that controls the motor 8 to rotate the second reel 6 according to the measurement amount, and the first reel The motor 8 is controlled to rotate the second reel 6 by rotation determination means (comprising a pair of mark sensor unit 60 and control unit 70) for determining whether or not 52 is rotating, and rotation drive control means. When the first reel 52 by rotation determining means in a state where there is judged to be not rotating, a failure notification means for notifying that a fault has occurred (control unit 70), the.

  Further, an inner mark portion 57c and an outer mark portion 57d including a black mark B and a white mark W are provided on the outer surface 57b of the bottom plate 57 that rotates in accordance with the rotation of the first reel 52. The black mark B and the white mark W of the inner mark portion 57c and the outer mark portion 57d are arranged to face a part of the moving path of the white mark W, and a signal corresponding to the presence of the black mark B and the white mark W in the part is output. A pair of mark sensor units 60 and signal determining means (control unit) for determining whether or not the one end side reel is rotating based on a signal output by the mark sensor unit 60 (specifically, the light receiving element 60b). 70).

  According to the present embodiment, when it is determined that the first reel 52 is not rotating in a state where the second reel 6 is rotated so as to wind or feed the wire 4 to which the pointer 3 is attached. Notify that a failure has occurred. For example, when the wire 4 is normal without disconnection or slack, the rotation of the second reel 6 is transmitted to the first reel 52 through the wire 4, that is, when the second reel 6 is rotated, the first reel 52 is simultaneously rotated. It is rotated. On the other hand, when the wire 4 has a defect such as disconnection or slack, the rotation of the second reel 6 is not transmitted to the first reel 52, that is, the first reel 52 rotates simultaneously even if the second reel 6 rotates. Not. Therefore, it is possible to detect a failure by determining that the first reel 52 is not rotating in a state where the second reel 6 is rotating, thereby quickly detecting a failure due to a defect related to the wire 4. Can be notified.

  Further, the outer surface 57b of the bottom plate 57 that rotates in accordance with the rotation of the first reel 52 is provided with an inner mark portion 57c and an outer mark portion 57d including a black mark B and a white mark W, and these mark portions 57c, In the part outputted by the pair of mark sensor parts 60 arranged to face part of the trajectory of the black mark B and the white mark W that 57d moves (that is, the part facing the bottom plate through holes 54a, 54b). Since it is determined whether or not the first reel 52 is rotating based on a signal corresponding to the presence of the black mark B and the white mark W, the presence of the black mark B and the white mark W provided on the first reel 52 is determined. It can be detected by the mark sensor unit 60 to determine whether or not the first reel 52 is rotating directly. It is possible to detect the failure.

  In the above-described embodiment, the inner mark portion 57c and the outer mark portion 57d are provided, and the rotational movement of these is detected by the pair of mark sensor portions 60, but only the inner mark portion 57c or the outer mark portion 57d. It is also possible to have a configuration in which only one mark sensor unit 60 detects the rotational movement of the mark unit.

  In the above-described embodiment, the inner mark portion 57c and the outer mark portion 57d are configured such that the belt-like black marks and the white marks are alternately arranged over the entire circumference. The mark portion is not limited to this. For example, the mark portion is provided with a white surface on the entire outer surface 57b of the bottom plate 57 of the first reel 52 and including only one strip-shaped black mark extending in the radial direction. When the black mark exists at a position facing the mark sensor unit 60, the pointer 3 may be configured to indicate a predetermined origin (for example, “0” of the numerical value 21b). That is, the mark portion includes an origin mark (the black mark) indicating that the pointer 3 is located at the origin, and the origin mark moves when the pointer 3 is located at the origin. When the control unit 70 (that is, the signal determination means) is provided so as to exist in a part of the track (the bottom plate through holes 54a and 54b), and the mark sensor unit 60 outputs a signal indicating the presence of the origin mark in the part. The pointer may be configured to be detected at the origin. By doing in this way, the origin adjustment of the pointer 3 can be easily and highly accurately performed without adding a new mechanism for adjusting the origin.

  Moreover, although the mark sensor unit 60 is configured by a reflective photosensor, the present invention is not limited to this. For example, a plurality of through holes are provided at equal intervals over the entire circumference in the circumferential direction of the bottom plate 57 of the first reel 52, and the light emitting element and the light receiving element are arranged so as to sandwich a part of the track on which the through holes rotate. It may also be configured with a photo interrupter. Alternatively, a magnet may be fixed to a part of the bottom plate 57 of the first reel 52, and may be configured by a magnetic detection sensor such as a reed switch disposed to face a part of the track on which the magnet rotates.

  In the above-described embodiment, the straight portion 11a that connects the first attachment portion 11b and the second attachment portion 11c is provided in consideration of the strength of the frame 11, but the straight portion 11a is essential for the present invention. It is possible to omit the configuration. In this case, since a wider space can be provided at the center of the pointer moving unit 10, the speedometer 1 with a higher degree of layout freedom can be provided.

  In the above-described embodiment, the second reel 6 has the reel body 61 and the length adjusting unit 62. However, the length adjusting unit 62 is not an essential configuration of the present invention and is omitted. Is possible. In the second reel 6A in this case, as shown in FIG. 12, a through hole 64b is provided in the peripheral wall 64 of the reel body 61, and the other end 4b of the wire 4 is drawn into the inside of the reel body 61 from the through hole 64b. What is necessary is just to make it attach to the reel main body 61 by providing a knot in this other end 4b. In FIG. 12, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the above-described embodiment, the speedometer 1 is described as an example of the pointer instrument device. However, the instrument device of the present invention is not limited to the speedometer 1 and can be applied to various meters such as a tachometer, for example. Is possible.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Speedometer (guideline instrument device)
2 Dial 3 Pointer 4 Wire (Linear member)
5 Case 6 Second reel (reel on the other end)
7 Spring (Rotating force applying member)
8 Motor (Rotary drive part)
9 Case 10 Pointer moving unit 21 Scale unit 21a Scale line (index)
21b Numerical value (index)
52 1st reel (one end reel)
57 Bottom plate of first reel 57b Outer surface (location that rotates with the rotation of one end side reel)
57c Inside mark part (mark part)
57d Outer mark part (mark part)
60 A pair of mark sensor parts (part of rotation determination means)
70 control unit (rotation drive control means, part of rotation determination means (signal determination means), failure notification means)
B Black mark (mark)
W White mark (mark)

Claims (3)

A pointer moving unit that moves the pointer so as to instruct the indicator provided on the dial according to the measurement amount;
A flexible linear member disposed along the direction of arrangement of the indicators of the dial and to which the pointer is attached;
One end side reel to which one end of the linear member is attached;
The other end side reel to which the other end of the linear member is attached;
A rotational force imparting member that imparts rotational force to the one end side reel so as to wind up the slack of the linear member;
A rotation drive unit that rotates the reel on the other end side in a direction of winding the linear member or a direction of feeding out the linear member;
Rotation drive control means for controlling the rotation drive unit so as to rotate the other-end reel according to the measurement amount;
Rotation determination means for determining whether or not the one end side reel is rotating;
When the rotation determination unit determines that the one end side reel is not rotating in a state where the rotation driving unit is controlled to rotate the other end side reel by the rotation drive control unit, a failure occurs. A failure notification means for notifying the occurrence,
A pointer moving unit characterized by comprising: A mark portion including a predetermined mark is provided at a portion that rotates with the rotation of the one end side reel,
The rotation determining means is arranged opposite to a part of the trajectory where the mark moves, and outputs a signal according to the presence / absence of the mark in the part, and is output by the mark sensor part The pointer moving unit according to claim 1, further comprising: a signal determination unit that determines whether or not the one end side reel is rotating based on a signal. In a pointer instrument device having a pointer, a dial provided with an index indicated by the pointer, and a pointer moving unit that moves the pointer to indicate the index according to a measurement amount,
3. A pointer instrument device, wherein the pointer moving unit comprises the pointer moving unit according to claim 1 or 2.

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