JP2013076715A - Member for fixing plate to be read, assembly for fixing plate to be read, signal detection device, and rotary encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for fixing a plate to be read, which is capable of effectively protecting a plate to be read when attaching and fixing the plate to be read to a revolving shaft, and to provide an assembly for fixing a plate to be read, a signal detection device, and a rotary encoder.SOLUTION: For example, when a plate 40 to be read is attached and fixed to a revolving shaft 10, a member 30 for fixing a plate to be read is used which is engaged with the revolving shaft 10 to fix the plate 40 to be read to the revolving shaft 10 and has an outer shape equal to or larger than that of the plate 40 to be read. Therefore, fingertips or the like of a worker can be effectively prevented from coming into contact with the plate 40 to be read, and the plate 40 to be read is effectively protected even after the plate 40 to be read is attached and fixed.

Description

  The present invention is, for example, a member for fixing a plate to be read for mounting and fixing a plate to be read such as a slit plate to a rotation shaft of a motor or the like that is driven to rotate, an assembly for fixing the plate to be read, and a signal detection device, And a rotary encoder.

  2. Description of the Related Art Conventionally, an encoder that performs device operation position control is known (see, for example, Patent Document 1). Specifically, in the conventional encoder disclosed in Patent Document 1, a disc-shaped slit plate is mounted on the rotating shaft of a motor, and the slit plate is optically detected by a photo interrupter. . The slit plate has a plurality of elastic claws provided around the center hole. Moreover, the conventional encoder has a slit holding member for attaching a slit plate to a rotating shaft. Then, the slit plate is attached to the rotating shaft via the slit holding member by inserting the center hole into the boss portion of the slit holding member and bending each elastic claw along the boss portion for elastic contact. .

A slit plate mounted on such an encoder is generally very thin and easily deformed, and a plurality of slits are arranged at a high density, so that the handling thereof is very difficult. For example, when attaching the slit plate to the rotating shaft,
The slit plate may be damaged or deformed due to circumstances such as the operator's fingertip touching the slit plate. For example, if the slit plate is damaged or deformed, the reading result is adversely affected, and in some cases, it becomes a defective product.

  Such a problem does not occur only in the encoder having the above-described slit plate. For example, when a reading plate other than the slit plate is attached to the rotating shaft, the same problem may occur.

JP-A-5-296789 (FIG. 3)

  In view of the circumstances described above, the present invention provides a member for fixing a plate to be read, an assembly for fixing a plate to be read, which can effectively protect the plate to be read when the plate to be read is attached and fixed to a rotating shaft, and the like. An object is to provide a signal detection device and a rotary encoder.

  In order to achieve the above object, a member for fixing a reading plate of the present invention is a member that engages with a rotating shaft and fixes the reading plate to the rotating shaft, and is equal to or more than the outer shape of the reading plate. It has the external shape of this.

  The read plate fixing assembly of the present invention for achieving the above object includes a read plate fixing member that engages with a rotation shaft and fixes the read plate to the rotation shaft, and the read plate. And a fitting member fitted to the rotating shaft, and the member for fixing the plate to be read has an outer shape equal to or greater than the outer shape of the plate to be read and the fitting through the plate to be read Engaging with a member, the read plate is clamped and fixed between the read plate fixing member and the fitting member.

  Furthermore, the signal detection device of the present invention for achieving the above object includes a motor that is rotationally driven, a read plate that engages with a rotary shaft that protrudes from the motor, and the rotary shaft via the read plate. A read plate fixing member that engages and fixes the engaged state of the read plate with respect to the rotation shaft; and a signal detection unit that detects a rotation state of the read plate as a signal. The plate fixing member has an outer shape equal to or greater than the outer shape of the plate to be read.

  In order to achieve the above object, a rotary encoder according to the present invention includes the signal detection apparatus according to the above-described aspect.

  According to the present invention, the outer shape of the reading plate fixing member is equal to or larger than the outer shape of the reading plate. For example, when the reading plate is attached and fixed to the rotating shaft, the fingertip of the operator And the like can be effectively prevented from coming into contact with the read plate, and the read plate can be effectively protected.

  In addition, according to the present invention, the read plate is substantially covered with the read plate fixing member even after the read plate is attached and fixed to the rotating shaft. It is possible to effectively prevent foreign matter such as the like from adhering, and to effectively protect the read plate.

FIG. 3 is an exploded perspective view showing a schematic configuration of the read plate fixing assembly according to the first embodiment. FIG. 3 is an exploded perspective view showing a schematic configuration of the read plate fixing assembly according to the first embodiment. FIG. 4 is an exploded perspective view showing a schematic configuration of a signal detection device and the like according to a second embodiment. FIG. 5 is a schematic side view showing the configuration of a signal detection device and the like according to Embodiment 2. Schematic which shows the assembly state of the signal detection apparatus etc. which concern on Embodiment 2. FIG. Schematic which shows the assembly state of the signal detection apparatus etc. which concern on Embodiment 2. FIG. FIG. 6 is an exploded perspective view illustrating an outline of a signal detection device and the like according to a third embodiment. FIG. 6 is an exploded perspective view illustrating an outline of a signal detection device and the like according to a fourth embodiment. FIG. 10 is an exploded perspective view illustrating an outline of a signal detection device and the like according to a fifth embodiment. FIG. 10 is an exploded perspective view illustrating an outline of a read plate fixing assembly and the like according to a sixth embodiment. The schematic sectional drawing which shows the signal detection apparatus etc. which concern on other embodiment.

  Hereinafter, the present invention will be described in detail based on embodiments for carrying out the present invention.

(Embodiment 1)
1 and 2 are exploded perspective views showing a schematic configuration of a read plate fixing assembly using a read plate fixing member according to Embodiment 1 of the present invention.

  As shown in FIG. 1 and FIG. 2, the reading plate fixing assembly 100 of this embodiment includes a fitting member 20 that fits to one end that is a free end of the rotating shaft 10, and the fitting member 20. The read plate fixing member 30 is engaged, and the read plate 40 is sandwiched and fixed between the read plate fixing member 30 and the fitting member 20, and the read plate 40 is read by the read plate fixing member 30. Is effectively protected.

  Here, in the present embodiment, the read plate 40 is formed of a disk-shaped slit plate, for example. Specifically, an insertion hole 41 penetrating in the thickness direction is provided at the center of the reading plate 40, and a plurality of radially extending slits 42 are individually provided along the circumferential direction around the insertion hole 41. It is also attached. The area where the slits 42 are provided becomes a read area 43 for detecting the rotation state of the read plate. Further, a portion corresponding to the inner peripheral edge of the insertion hole 41 of the plate to be read 40 is provided with a notch 44 used for positioning at the time of attachment to the fitting member 20 as will be described in detail later. ing.

  In this embodiment, such a plate to be read 40 is attached to the fitting member 20 that is fitted to one end of the rotating shaft 10. The fitting member 20 has, for example, a disk shape, has an outer diameter slightly larger than the insertion hole 41 of the reading plate 40, and is disposed so as to correspond to the inner side of the reading region 43 of the reading plate 40. Yes. Thereby, it becomes space saving and size reduction is realizable. Such a fitting member 20 is provided with a fitting hole 21 that penetrates the center of the fitting member 20 in the thickness direction and fits one end of the rotary shaft 10. Note that, on one side of the fitting member 20, specifically, the side on which the reading plate 40 is mounted, a cylindrical portion 22 having a fitting hole 21 and protruding in a cylindrical shape is provided.

  Further, in the present embodiment, around the cylindrical portion 22 of the fitting member 20, three engagement holes 23 to be engaged with engagement protrusions to be described later of the reading plate fixing member 30 are respectively arranged at substantially equal intervals. Is provided. Furthermore, two insertion holes 24 into which locking projections (to be described later) of the member to be read plate fixing 30 are inserted are respectively opposed to the corresponding portions between the engagement holes 23 of the fitting member 20. Is provided. The engagement hole 23 and the insertion hole 24 are disposed so as to be positioned in the insertion hole 41 of the reading plate 40, respectively.

  Further, the fitting member 20 is provided with a positioning portion 25 for positioning the read plate fixing member 30 in the rotational direction. The positioning portion 25 is provided at a position corresponding to the inner edge of the insertion hole 41 of the reading plate 40, and the end thereof is, for example, related to the notch portion 44 of the reading plate 40 in this embodiment. Positioning convex portions 26 are provided.

  The fitting member 20 is attached and fixed to one end portion of the rotating shaft 10 by fitting the fitting hole 21 to one end portion of the rotating shaft 10. As will be described in detail later, the mounting and fixing position of the reading plate 40 with respect to the rotating shaft 10 is determined by the mounting position of the fitting member 20 with respect to the rotating shaft 10.

  On the other hand, the reading plate fixing member 30 that engages with the fitting member 20 described above has, for example, the same outer diameter shape as the reading plate 40 in the present embodiment, that is, the reading target. It has a circular shape equivalent to the plate 40.

  Specifically, the read plate fixing member 30 according to the present embodiment has a substantially disk shape, and includes a large diameter portion 31 having an outer diameter equivalent to the outer diameter of the read plate 40, and the large diameter portion 31. A small-diameter portion 32 having an outer diameter smaller than the outer diameter of the large-diameter portion 31 and larger than the diameter of the insertion hole 41 of the read plate 40 is provided in the center of the one surface side so as to protrude by a predetermined amount.

  Here, in the present invention, the member for fixing the reading plate may be a member having an outer shape equal to or larger than the outer shape of the reading plate, and is not limited to the above-described example of the present embodiment. . In other words, the member for fixing the plate to be read according to the present invention may have the same outer shape as the plate to be read, or may have a larger outer shape than the plate to be read. In addition, the outer shape of the member for fixing the reading plate may be the same shape as the reading plate, or may be different from the shape of the reading plate. That is, the member for fixing the reading plate according to the present invention has a shape that substantially covers the reading plate when or after the reading plate is attached to the rotating shaft in order to effectively protect the reading plate. That's fine.

  Further, the read plate fixing member 30 is provided with a through-hole 33 that penetrates the centers of the large diameter portion 31 and the small diameter portion 32 in the thickness direction. The cylindrical portion 22 of the fitting member 20 described above is inserted into the through hole 33 together with one end portion of the rotating shaft 10 in the engaged state with the fitting member 20.

  Further, on the end face of the small-diameter portion 32 of the member 30 for fixing the read plate, specifically, around the through-hole 33 on the small-diameter portion 32 side, is engaged at a position corresponding to the engagement hole 23 of the fitting member 20. Protrusions 34 are erected. Note that an engagement claw 34 a for engaging with the engagement hole 23 of the fitting member 20 is provided at the tip of each engagement projection 34.

  On the end surface of the read plate fixing member 30 on the small diameter portion 32 side, two locking projections 35 are erected at positions corresponding to the inner peripheral edge of the insertion hole 41 of the read plate 40. . In addition, in such a locking projection 35, the end surface (side surface) opposite to the through hole 33 side is a curved surface along the inner peripheral surface of the insertion hole 41 of the read plate 40. Further, a positioning hole 36 into which the positioning portion 25 of the fitting member 20 and the positioning convex portion 26 are fitted is provided on the end surface of the small diameter portion 32 of the member 30 for fixing the plate to be read (FIG. 2). reference).

  Here, the material for forming the read plate fixing member 30 is not particularly limited, but is preferably formed of a high-density material such as brass. This is because the rotation of the rotating shaft 10 can be stabilized.

  Moreover, it is preferable that the whole shape of the member 30 for reading plate fixation is a substantially uniform shape. The “substantially uniform shape” means, for example, a shape having a good balance (a shape having good symmetry) around the axis of the rotation shaft 10. In the present embodiment, the reading plate fixing member 30 has a circular shape and a shape having good symmetry around the axis of the rotary shaft 10, and therefore, as a so-called flywheel that stabilizes the rotation of the rotary shaft 10. Play a role.

  The read plate fixing assembly 100 including the read plate fixing member 30 and the fitting member 20 according to this embodiment described above is applied to one end of the rotary shaft 10 by the following procedure. The reading plate 40 is attached and fixed. First, the fitting hole 21 of the fitting member 20 is fitted to one end of the rotating shaft 10. At this time, the fitting position of the fitting member 20 is adjusted to be a predetermined position from the distal end of the rotating shaft 10 to the proximal end side.

  Next, the read plate 40 is attached to the fitting member 20. Specifically, the notched portion 44 of the reading plate 40 is aligned with the positioning portion of the fitting member 20, and the reading plate 40 is positioned in the rotation direction. That is, the rotational movement of the read plate 40 is restricted by the positioning convex portion 26 of the read plate fixing member 30. Thus, in this embodiment, since the positioning part 25 was provided in the fitting member 20, the attachment operation | work of the to-be-read plate 40 with respect to the rotating shaft 10 can be improved. Further, here, since the attachment position to the rotating shaft 10 is adjusted in advance by the fitting member 20, the reading plate 40 is attached to the predetermined position of the rotating shaft 10 by mounting the reading plate 40 on the fitting member 20. 40 can be installed relatively well and quickly.

  Next, the member to be read plate fixing 30 is engaged with the fitting member 20. Specifically, the engagement protrusion 34 of the member to be read plate fixing 30 is inserted into the engagement hole 23 of the fitting member 20 located in the insertion hole 41 of the plate 40 to be read. At the same time, the locking projection 35 of the member to be read plate fixing 30 is inserted into the insertion hole 24 of the fitting member 20. Further, at this time, the positioning portion 25 and the positioning convex portion 26 of the fitting member 20 are inserted into the positioning hole 36 of the member to be read plate fixing. As a result, the read plate 40 is clamped between the fitting member 20 and the read plate fixing member 30 (actually, the small diameter portion 31) in a state where movement in the rotational direction is restricted, and the locking projection The center of the rotary shaft 10 is positioned and fixed at a predetermined position on one end of the rotary shaft 10 by the portion 35. As described above, in this embodiment, since the locking projection 35 is provided on the read plate fixing member 30, the center position of the read plate can be quickly adjusted, and the read plate 40 is attached to the rotating shaft 10. Work can be improved. Note that, in the fixed state, the read plate 40 and the read plate fixing member 30 (large diameter portion 31) are substantially parallel in the axial direction of the rotary shaft 10.

  As described above, in the present embodiment, since the outer shape of the read plate fixing member 30 (large diameter portion 31) is the same as the outer shape of the read plate 40, for example, the read plate 40 is attached to the rotary shaft 10. When attaching and fixing the plate, it is possible to effectively prevent an operator's fingertip or the like from coming into contact with the read plate 40, and to protect the read plate 40 effectively.

  In particular, in this embodiment, since the outer shape of the member 30 for fixing the read plate (large diameter portion 31) is the same as the outer shape of the plate 40 to be read, the fingertip of the operator contacts the plate 40 to be read. This can be prevented more effectively.

  Further, in the state in which the reading plate fixing member 30 is engaged with the fitting member 20 in this way, in this embodiment, the reading plate fixing member 30 and the reading plate 40 are very close to each other. It becomes a relationship. In this embodiment, since the outer shape of the read plate fixing member 30 is the same as the outer shape of the read plate 40, the entire read plate 40 is substantially formed by the read plate fixing member 30. It will be covered. Accordingly, it is possible to effectively prevent foreign matters such as dust and dirt from adhering to the read plate 40 when the read plate fixing member 30 is attached or after the attachment operation.

  Further, in the present embodiment, the fitting member 20 is fitted at a predetermined position of the rotary shaft 10 prior to the read plate 40, so that the fitting member 20 is attached and fixed to the rotary shaft 10 of the read plate 40. The standard. Therefore, after the reading plate 40 is mounted on the fitting member 20, the reading plate fixing member 30 is engaged with the reading plate 40, thereby quickly and accurately holding and fixing the reading plate 40 at a predetermined position of the rotary shaft 10. can do. In this embodiment, the read plate 40 is positioned in the rotational direction on the fitting member 20 side, and the center is positioned on the read plate fixing member 30 side. For example, the reading plate 40 may be positioned on the reading plate fixing member 30 side and the center of the reading plate 40 may be positioned on the fitting member 20 side. The rotation direction and the center of the read plate 40 may be positioned on either the fitting member 20 or the read plate fixing member 30.

  In this embodiment, since the member 30 for fixing the reading plate is engaged with the rotating shaft 10, the member 30 for fixing the reading plate is also connected to the reading plate 40 as the rotating shaft 10 rotates. It will rotate integrally. As a result, the read plate 40 is substantially covered with the read plate fixing member 30 not only when the rotating shaft 10 is not rotating but also when being rotated, so that the read plate 40 is effectively protected. be able to.

(Embodiment 2)
FIG. 3 is an exploded perspective view showing a schematic configuration of a signal detection apparatus having a read plate fixing assembly using a read plate fixing member according to Embodiment 2 of the present invention. FIG. 4 is a schematic side view showing the signal detection apparatus of FIG.

  As shown in FIGS. 3 and 4, the signal detection device 200 of this embodiment is an example as a rotary encoder, for example, and the read plate fixing member 30 (read plate fixing set) of the first embodiment described above. A solid plate 100) is used to attach and fix the read plate 40 to a rotating shaft 51 protruding from a motor 50 that is driven to rotate, and the rotation state of the read plate 40 near the end of the read plate 40 as a signal. The present embodiment is the same as Embodiment 1 described above except that the signal detection means 60 for detection is provided. In the present embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, for example, in the present embodiment, the rotary shaft 51 is provided with a rotary shaft 51 projecting a predetermined amount from one end side, and a pinion gear 52 that transmits the rotary drive of the rotary shaft 51 to the outside on the other end side. Is provided.

  Moreover, the signal detection means 60 consists of transmissive | pervious optical sensors, such as a photo interrupter, for example in this embodiment. Specifically, the signal detection means 60 of the present embodiment includes a light emitting unit 61 that irradiates light to the read area 43 of the read plate 40 and the other surface side of the read plate 40 that faces the light emitting unit 61. And a light receiving unit 62 that receives light through the read plate 40. A gap is provided between the light emitting unit 61 and the light receiving unit 62 so that the end of the rotating plate 40 to be rotated, specifically, the end including the read region 43 passes therethrough. The rotation state of the plate 40 to be read is detected as a signal.

  Furthermore, it is preferable that the light emitting unit 61 or the light receiving unit 62 constituting the signal detecting unit 60 is disposed in a gap between the reading plate 40 and the reading plate fixing member 30. For example, in the present embodiment, the light emitting unit 61 is disposed between the read plate 40 and the read plate fixing member 30, and corresponds to the side facing the light emitting unit 61 and the outside of the fitting member 20. The light receiving unit 62 is disposed in the portion to be operated. Thereby, space saving can be achieved and size reduction can be realized. Of course, the same effect can be obtained by arranging the light emitting portion 61 between the read plate 40 and the read plate fixing member 30.

  The signal detection means 60 is provided with a connector portion 63 for transmitting a signal to the outside. Such signal detection means 60 is mounted on a substrate 70 to be attached to the end face of the motor 50. The substrate 70 is provided with first fitting grooves 71 that fit into two convex portions 53 disposed concentrically with the rotary shaft 51 on the end face of the motor 50. Further, a second fitting groove 72 that fits into the base end portion of the rotating shaft 51 of the motor 50 is provided at the end portion of the substrate 70.

  Here, with reference to FIG. 5 and FIG. 6, an assembly procedure of the signal detection device 200 of the present embodiment will be described. 5 and 6 are schematic views showing an assembled state of the signal detection device according to the first embodiment of the present invention.

  First, as shown in FIG. 5, the first fitting groove 71 of the substrate 70 on which the signal detecting means 60 is mounted is fitted to the two convex portions 53 provided on the end face of the motor 50, and the base of the rotating shaft is set. After fitting the second fitting groove 72 to the end, in order to supply power to the motor 50, both are electrically connected by soldering or the like. Next, the fitting hole 21 of the fitting member 20 is fitted to the rotating shaft 51 of the motor 50. At this time, in the present embodiment, the relative position between the fitting member 20 and the read plate 40 with respect to the signal detection means 60 is adjusted. Specifically, the mounting position of the fitting member 20 with respect to the rotating shaft 51 of the motor 50 is set to a predetermined position with reference to the mounting position of the signal detection means 60 with respect to the motor 50. Thereby, the reading plate 40 can be attached and fixed at a predetermined position between the light emitting unit 61 and the light receiving unit 62 of the signal detecting unit 60. At this time, a mark may be provided on the rotating shaft 51 in advance, and the fitting member 20 may be attached to the rotating shaft 51 with reference to the mark.

  Next, as shown in FIG. 6, the read plate 40 is mounted at a predetermined position of the fitting member 20 from an oblique direction with respect to the rotation shaft 51 of the motor 50. Thereafter, in a state where the reading plate 40 is mounted on the fitting member 20, the reading plate fixing member 30 is engaged with the fitting member 20 from above. As a result, the plate 40 to be read is clamped and fixed between the fitting member 20 and the member 30 for reading plate fixing (see FIG. 4).

  As described above, when the reading plate fixing member 30 is engaged with the fitting member 20, in this embodiment, the outer diameter of the reading plate fixing member 30 (large diameter portion 31) is set to the outside of the reading plate 40. Since the diameter is the same, it is possible to effectively prevent an operator's fingertip or the like from coming into contact with the plate 40 to be read, and to effectively protect the plate 40 to be read.

  Here, the material for forming the read plate fixing member 30 is not particularly limited, but is preferably formed of a high-density material such as brass. This is because in the signal detection device 200 as in this embodiment, the rotation of the motor 50 that is driven to rotate can be stabilized.

  Moreover, it is preferable that the whole shape of the member 30 for reading plate fixation is a substantially uniform shape. This “substantially uniform shape” means, for example, a shape with good balance (a shape with good symmetry) around the axis of the rotation shaft 51. In the present embodiment, the member to be read plate fixing 30 has a circular shape and a shape having good symmetry around the axis of the rotation shaft 51, so that it functions as a so-called flywheel that stabilizes the rotation of the motor 50. Fulfill. Thereby, the performance of the signal detection apparatus 200 can be stabilized.

  In this embodiment, since the read plate fixing assembly 100 (read plate fixing member 30) of the first embodiment described above is used, the same effects as those of the first embodiment described above are obtained. Further, as in this embodiment, the reading plate fixing member 30 is provided at a position relatively close to the reading plate 40 so that the reading plate 40 is effectively protected, so that the signal detection apparatus 1 as a whole is protected. There is also an effect of downsizing.

  In this embodiment, since the signal detecting means 60 is connected to the motor 50 together with the substrate 70 and the connector portion 63, the read plate 40 is attached and fixed, so that a sufficient connection work space for soldering or the like is provided. Can be secured. Accordingly, it is not necessary to secure a connection work space such as soldering as compared with the case where the reading plate 40 is first attached and fixed, which is advantageous for downsizing the apparatus. Of course, the present invention is not limited to this, and if the subsequent work space can be secured even if the reading plate 40 is attached and fixed first, the reading plate 40 is attached and fixed first. You may make it connect the signal detection means 60 grade | etc.,.

(Embodiment 3)
FIG. 7 is an exploded perspective view showing an outline of a signal detection apparatus having a read plate fixing assembly using a read plate fixing member according to Embodiment 3 of the present invention.

  As shown in FIG. 7, the signal detection device 200 </ b> A of the present embodiment is the same as that of the second embodiment described above, except that the read plate fixing member 300 and the read plate 400 having shapes different from those of the second embodiment are provided. It is. In the present embodiment, the same components as those described in the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the plate to be read 400 is a shielding plate, a circular portion 401 provided concentrically with the rotation shaft 51, and two blade portions provided so as to protrude from opposite ends of the circular portion 401. 402.

  On the other hand, a member for fixing a plate to be read 300 for attaching and fixing such a plate to be read 400 to the rotating shaft 51 corresponds to the two blade portions 402 of the plate to be read 400 in the present embodiment. Two flange portions 311 are respectively provided at opposite end portions of the large diameter portion 310 and have the same shape as the outer shape of the plate to be read 400.

  In this embodiment, the member for fixing the plate to be read 300 is integrated with the rotary shaft 51 such that each flange portion 311 and each blade portion 402 of the plate to be read 400 overlap each other in the direction around the axis of the rotary shaft 51. It is engaged with the fitting member 20 so as to rotate.

  As described above, in this embodiment, since the outer shape of the reading plate fixing member 300 (the large diameter portion 310 and each flange portion 311) is the same as the outer shape of the reading plate 400, the rotating plate 51 includes the reading plate. When attaching and fixing 400, it is possible to effectively prevent an operator's fingertips or the like from coming into contact with the reading plate 400, and to effectively protect the reading plate 400.

  In particular, in this embodiment, each flange portion 311 of the member to be read plate fixing 300 and each blade portion 402 of the plate to be read 400 are provided so as to overlap each other. It is possible to more effectively prevent contact with the surface.

  Further, in this embodiment, since the member for fixing the plate to be read 300 is provided so as to substantially cover the plate to be read 400, the same effects as those in the first and second embodiments described above are obtained.

  In the present embodiment, the reading plate fixing member 300 having the same shape as the reading plate 400 has been described as an example. However, the present invention is not limited to this, and the reading plate and the reading plate fixing member are different. It may be a shape.

(Embodiment 4)
FIG. 8 is an exploded perspective view showing an outline of a signal detection apparatus having a read plate fixing assembly using a read plate fixing member according to Embodiment 4 of the present invention.

  As shown in FIG. 8, the signal detection device 200B of the present embodiment is the same as that of the third embodiment described above except that the read plate 400 and the read plate fixing member 300B have different shapes. In addition, in this embodiment, the same code | symbol is attached | subjected about the component same as the component demonstrated in each Embodiment 1-3 mentioned above, and the overlapping description is abbreviate | omitted.

  Specifically, in the read plate fixing member 300B of the present embodiment, two flange portions 311B are provided at opposite ends of the large diameter portion 310B corresponding to the two blade portions 402 of the read plate 400, respectively. It has been. Further, another flange portion 312B protrudes between the flange portions 311B, that is, the large-diameter portion 310B that does not interfere with the blade portions 402 of the reading plate 400.

  As a result, the flange portion 311B corresponding to each blade portion 402 of the plate to be read 400 substantially covers and effectively protects the plate to be read 400 (each blade portion 402), and the worker can make another flange portion. By attaching the read plate fixing member 300B to the fitting member 20 while holding the 312B, the workability of attaching the read plate 400 can be further improved.

  In the present embodiment, the flange portions 311B and 312B have the same shape and are equally spaced from each other, that is, approximately the same shape around the rotation shaft 51. Thereby, the reading plate fixing member 300 </ b> B of the present embodiment serves as a so-called flywheel that stabilizes the rotation of the motor 50, and can stabilize the performance of the signal detection device 200.

(Embodiment 5)
FIG. 9 is an exploded perspective view showing an outline of a signal detection apparatus having a read plate fixing assembly using a read plate fixing member according to a fifth embodiment of the present invention.

  As shown in FIG. 9, the signal detection device 200 </ b> C according to the present embodiment does not include the fitting member 20 listed as the configuration in each of the above-described second to fourth embodiments, and the read plate 600 by the read plate fixing member 500. Is the same as that of the second embodiment described above except that is directly attached and fixed to the rotary shaft 51. In the present embodiment, the same components as those described in the second embodiment are denoted by the same reference numerals, and duplicate descriptions are omitted.

  Specifically, as shown in FIG. 9, the read plate fixing member 500 of the present embodiment includes a cylindrical portion 502 provided with a fixing hole 501 that fits into the rotating shaft 51, and the cylindrical portion 502. And a positioning projection 503 provided so as to protrude from the outer periphery. On the other hand, a portion corresponding to the inner peripheral edge of the insertion hole 601 of the reading plate 600 is provided with a substantially rectangular notch 602 that engages with the positioning projection 503.

  In such a reading plate fixing member 500, the notch portion 602 of the reading plate 600 is aligned with the positioning protrusion 503 of the cylindrical portion 502, and the insertion hole 601 of the reading plate 600 is inserted into the cylindrical portion 502. After being inserted, although not shown, it is integrally fixed with an adhesive or the like. The reading plate fixing member 500 to which the reading plate 600 is fixed in this way is fitted to the rotation shaft 51 by fitting the fixing hole 501 of the cylindrical portion 502 to the rotation shaft 51 of the motor 50. A reading plate 600 is attached and fixed.

  In the present embodiment, when the reading plate 600 is attached and fixed as described above, the positioning projection 503 is engaged with the notch 602 of the reading plate 600, that is, the rotation of the reading plate 600. In a state in which the reading plate 600 is regulated, the reading plate 600 and the reading plate fixing member 500 are fixed to each other. Further, since the outer shape of the reading plate fixing member 500 (large diameter portion 510) is the same as the outer shape of the reading plate, when the reading plate 600 is attached and fixed to the rotating shaft 51, the fingertip of the operator And the like can be effectively prevented from contacting the reading plate 600, and the reading plate 600 can be effectively protected.

  In particular, in this embodiment, since the member for fixing the reading plate 500 and the reading plate 600 are fixed integrally in advance, the workability of attaching the reading plate 600 to the rotating shaft 51 by an operator or the like is improved. can do. In addition, for example, the number of parts can be reduced as compared with the above-described second embodiment, so that further cost reduction can be achieved.

  In this embodiment, since the reading plate fixing member 500 is provided so as to substantially cover the reading plate 600, the same effects as those of the second embodiment described above are obtained except for the above.

(Embodiment 6)
FIG. 10 is an exploded perspective view showing an outline of a read plate fixing assembly using a read plate fixing member according to Embodiment 6 of the present invention.

  As shown in FIG. 10, the present embodiment is an example in which the read plate fixing assembly 100 (read plate fixing member 30) is directly attached to one end portion of a roller shaft that conveys a sheet such as paper. .

  As described above, in this embodiment, the reading plate fixing assembly 100 (the fitting member 20 and the reading plate fixing member 30) is attached and fixed to the roller shaft 700 that performs sheet conveyance via the reading plate 40. Thus, for example, when the reading plate 40 is attached and fixed to the roller shaft 700, it is possible to effectively prevent an operator's fingertip or the like from coming into contact with the reading plate 40, and the like. Can be effectively protected. Further, even after the attachment to the roller shaft 700 is fixed, the reading plate 40 is substantially covered with the reading plate fixing member 30, so that foreign matters such as dust and dirt adhere to the reading plate 40. Can be effectively prevented, and the read plate 40 can be effectively protected.

(Other embodiments)
As mentioned above, although this invention was demonstrated based on each Embodiment 1-4, of course, this invention is not limited to each above-mentioned Embodiment 1-4. For example, in the first to fourth embodiments described above, the case where the reading plate is substantially covered with the reading plate fixing member has been described. However, the present invention is not limited to this, and as shown in FIG. Further, the reading plate 40, the reading plate fixing assembly 100 (the reading plate fixing member 30) for attaching and fixing the reading plate 40, the signal detecting means 60, and the like are entirely covered. As described above, a case 900 may be provided. FIG. 11 is a schematic cross-sectional view showing a signal detection device according to another embodiment of the present invention. Thus, by covering the entire functional unit unit 800 with the case 900, it is possible to effectively prevent foreign matters such as dust and dirt from entering the space around the functional unit unit 800. In the present invention, since the read plate is substantially covered and effectively protected by the read plate fixing member, such a case 900 may be provided as necessary. The whole 800 may not be covered so as to be sealed, and of course, such a case 900 may not be provided. When the case 900 is not provided, the apparatus can be reduced in size.

  In the above-described Embodiments 2 to 4, the optical detection encoder has been described as an example of the signal detection device. However, the present invention is of course not limited thereto, and other examples such as a magnetic encoder are available. This can also be applied to the encoders.

  Further, in each of the first to fourth embodiments described above, the slit plate and the shielding plate have been exemplified and described as the plate to be read. However, the present invention is intended to protect the entire reading plate including the slit plate and the shielding plate. Is. That is, the present invention can be applied to a reading plate such as a code plate having a predetermined code or a magnetic plate.

  Further, in each of the first to fourth embodiments described above, the structure including a single member as the member for fixing the reading plate has been illustrated and described. However, the present invention is of course not limited to this, and for example, a plurality of divided members It is good also as a member for fixing a to-be-read board which consists of these members.

  Further, in each of the first to fourth embodiments described above, the member for fixing the reading plate remains as a member constituting the product even after the reading plate is attached to the rotating shaft, but the present invention is not limited to this. When the plate to be read is attached to the rotating shaft with good workability, the member for fixing the plate to be read may be used, and after the plate to be read is attached, the member for fixing the plate to be read may be removed. In this case, in order to protect the read plate, it is preferable to cover the functional unit including the read plate with a case.

  Further, in each of the first to fourth embodiments described above, the plate to be read and the member for fixing the plate to be read are attached so as to be parallel in the axial direction of the rotating shaft in a state where the plate to be read is attached and fixed. The invention is not limited to this, and the member for fixing the plate to be read may be three-dimensional, for example, a conical shape. It should be noted that the peripheral edge of the member for fixing the plate to be read may be inclined toward the plate to be read to have a tapered shape. As a result, the read plate can be more effectively protected.

DESCRIPTION OF SYMBOLS 10 Rotating shaft 20 Fitting member 21 Fitting hole 22 Cylinder part 23 Engagement hole 24 Insertion hole 25 Positioning part 26 Positioning convex part 30 Member to be read fixing 31 Large diameter part 32 Small diameter part 33 Through hole 34 Engagement protrusion Part 34a Engaging Claw 35 Locking Protrusion 40 Reading Plate 41 Insertion Hole 42 Slit 43 Reading Area 44 Notch 100 Assembly for Fixing Reading Plate

Claims (7)

  A read plate fixing member that engages with the rotation shaft and fixes the read plate to the rotation shaft; and a fitting member that fits the rotation shaft prior to the read plate; A member having an outer shape equal to or greater than an outer shape of the read plate and engaging the fitting member via the read plate, and the read plate is fitted to the read plate fixing member and the fitting An assembly for fixing a plate to be read, which is clamped and fixed with a joint member.   A motor to be driven to rotate, a plate to be read that engages with a rotary shaft that protrudes from the motor, and a state in which the plate to be read is engaged with the rotary shaft while being engaged with the rotary shaft via the plate to be read. A member for fixing the reading plate to be fixed; and a signal detecting means for detecting a rotation state of the reading plate as a signal, and the member for fixing the reading plate is equal to or more than the outer shape of the reading plate. A signal detection device having an outer shape.   The signal detection means is disposed on one side of the read plate and irradiates the read plate with light, and the signal detection unit is disposed on the other surface of the read plate facing the light emission unit. 3. A light receiving portion that receives light through a reading plate, and the light emitting portion or the light receiving portion is disposed in a gap between the reading plate and the reading plate fixing member. The signal detection apparatus as described.   Prior to the reading plate, a fitting member fitted to the rotating shaft is provided, the reading plate fixing member is engaged with the fitting member via the reading plate, and the reading plate is 4. The signal detection apparatus according to claim 2, wherein the signal detection apparatus is clamped and fixed between a member to be read plate fixing and the fitting member.   The signal detecting device according to claim 4, wherein the fitting member is disposed corresponding to an inside of a read area provided along a peripheral edge portion of the read plate.   The signal detection apparatus according to claim 2, wherein the reading plate fixing member rotates integrally with the reading plate.   A rotary encoder comprising the signal detection device according to claim 2.

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