JP3084208U - Shaft rotating parts - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a shaft rotating component which suppresses positional deviation and tilting in a direction perpendicular to a rotating shaft. A support plate (2) having a circular through hole (4) formed therein is provided.
A burring portion 5 that stands up along the through hole 4 is provided. The shaft rotating component 3 is cylindrical and has an end surface 3a.
Is formed with a circular hole 6 that fits loosely with the outer peripheral surface 5a of the burring portion 5 at a predetermined gap C1, and the bottom portion 6a of the circular hole 6 has at least the inner peripheral surface 5b of the burring portion 5 and the gap C1.
A circular shaft 7 that loosely fits in a gap C2 of 1 or less is protruded,
The end 7a of the circular shaft 7 projects beyond the end face 3a. And, the shaft rotating component 3 is a rotating shaft A of the arm member 1.
And is rotatable with respect to the support plate 2 integrally with the arm member 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a shaft rotating component attached to a rotating shaft of an arm member having a rotating shaft, such as a loading arm mounted on a VTR, for example, and is particularly capable of rotating with respect to a support plate such as a frame. Shaft rotation parts.

[0002]

[Prior art]

 FIG. 4 shows a conventional pivoting part. FIG. 4 is a cross-sectional view taken along a rotation axis. 1 is an arm member such as a loading arm mounted on a VTR or the like, 2 is a support plate that contacts a frame of the VTR or the like, and 3 is an arm member 1. It is a pivotable part that is attached and can rotate with respect to the support plate 2 integrally with the arm member 1. The support plate 2 is formed with a circular through hole 4 penetrating along the rotation axis A, and is provided with a burring portion 5 standing up along the through hole 4. The pivoting component 3 is cylindrical and has a circular hole 6 formed in its end face 3a to be loosely fitted with the outer peripheral face 5a of the burring portion 5. When a turning power is applied to the arm member 1 by a driving means (not shown), the shaft turning part 3 turns around the turning axis A while the circular hole 6 is guided by the outer peripheral surface 5 a of the burring portion 5. I do.

[0003]

[Problems to be solved by the invention]

 By the way, in order to obtain smooth rotation of the shaft rotating part 3, a predetermined gap C1 is usually provided between the circular hole 6 and the outer peripheral surface 5a of the burring portion 5. However, the gap C1 can cause a deviation when the shaft rotating component 3 rotates, and the following problem occurs. Now, assuming that the design value of the gap C1 is C1a, first, the shaft rotating part 3 has a maximum positional deviation of C1a in the horizontal direction H (the direction perpendicular to the rotation axis A) indicated by an arrow. Accordingly, a similar displacement occurs in the arm member 1. In addition, in the maximum positional deviation state of C1a, the circular hole 6 of the shaft rotating component 3 receives a load from the outer peripheral surface 5a of the burring portion 5, so that the circular hole 6 is easily deformed outward and a larger positional deviation is caused. May be connected.

[0004] Secondly, as shown in FIG. 5, the pivoting part 3 is inclined at an angle θ with respect to the pivot axis A at the fulcrum P, and the inclination of the end part of the arm member 1 is caused. 1a is shifted in the height direction V (direction of the rotation axis A) indicated by the arrow. Then, when height accuracy is required at the end 1a, for example, when a rotating pole or the like for guiding the VTR tape is provided, troubles are likely to occur at the time of loading and unloading. Here, in FIG. 5, for convenience, the pivoting part 3 is tilted at the fulcrum P, and the corner 6 a of the circular hole 6 of the pivoting part 3 is in contact with the outer peripheral surface 5 a of the burring part 5. This is the maximum tilt state. Assuming now that the distance from the fulcrum P to the corner 6a of the circular hole 6 of the shaft rotating component 3 is R1, the maximum value θa of the angle θ is approximated by θa = C1a / R1 (1) Assuming that the distance from the rotation axis A of the arm member 1 to the end 1a is L, the maximum value Va of the displacement of the end 1a in the height direction V is given by the following equation (1). × C1a / R1 (2)

[0005] For example, in Japanese Patent Application Laid-Open No. 63-250195, a support plate having a through-hole having a burring portion and an insulating plate having an insertion hole through which the burring portion is inserted are overlapped with each other. A method of fixing a printed circuit board to fix an insulating plate to a support plate by caulking a portion is disclosed. Japanese Patent Application Laid-Open No. H7-241020 discloses a method of fixing an electronic component on a support plate having a through hole having a burring portion. A method for manufacturing an electrical junction box in which the lead terminal is inserted and the end of the lead terminal and the end of the burring portion are joined is disclosed.In each case, the method is completely fixed to the support plate. There is no element of movement.

Accordingly, the present invention has been made in view of the above-described problem, and has as its object to provide a shaft rotating component which suppresses positional deviation and tilting in a direction perpendicular to a rotating shaft. Things.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the pivoting part according to the present invention is provided with a burring portion that stands up along the through hole on a support plate having a circular through hole formed therein. In a shaft-rotating part having a circular shape that is rotatable with respect to the axis and having a circular hole formed on an end face thereof and having a predetermined clearance with the outer peripheral surface of the burring portion, the burring protrudes from the bottom of the circular hole. A circular shaft is provided which fits loosely with the inner peripheral surface of the portion at least within the gap and whose end protrudes from the end surface, and is attached to the rotating shaft of the loading arm of the VTR.

[0008] An annular projection that stands up along the through hole and has the same inner diameter as the diameter of the through hole is provided on the support plate having the circular through hole. A shaft hole which is rotatable and has a circular hole which is loosely fitted in the outer peripheral surface of the annular protrusion at a predetermined gap with the outer peripheral surface of the annular protrusion, protrudes from the bottom of the circular hole, and is slightly less than the inner peripheral surface of the annular protrusion. In addition, a circular shaft that fits loosely in the gap or less may be provided.

[0009] From the viewpoint of easily manufacturing the shaft rotating part and suppressing tilting during rotation, the shaft rotating part is cylindrical, and the circular hole is formed in the end surface thereof. End protrudes from the end face.

[0010] Further, in order to easily obtain a rotatable arm member that requires positional accuracy at the end, the shaft rotating component may be attached to a rotating shaft of the arm member.

It is preferable that the annular projection is provided by burring for the purpose of easily obtaining the annular projection.

[0012]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the pivoting part of the present invention. In the drawings, parts having the same names as those in FIGS. 4 and 5 are denoted by the same reference numerals, and overlapping description will be omitted. 1 is an arm member such as a loading arm mounted on a VTR or the like, 2 is a support plate corresponding to a frame of the VTR or the like, and 3 is attached to the arm member 1 and integrated with the arm member 1 to support the support plate 2. This is a pivotable part that can rotate. The support plate 2 is provided with a circular through hole 4 penetrating along the rotation axis A, and a burring portion 5 formed by burring so as to stand up along the through hole 4.

The shaft rotating part 3 has a columnar shape in consideration of easiness of manufacture, and a circular hole 6 is formed on an end face 3 a of the shaft rotating part 3 so as to loosely fit with the outer peripheral surface 5 a of the burring part 5 in a predetermined gap C 1. ing. At the bottom 6a of the circular hole 6, a circular shaft 7 that fits loosely into the inner peripheral surface 5b of the burring portion 5 with a predetermined gap C2 protrudes, and the end 7a of the circular shaft 7 is larger than the end surface 3a. Projecting. Here, the design value C2a of the gap C2 between the circular shaft 7 and the inner peripheral surface 5b of the burring portion 5 is C2a ≦ the design value C1a of the gap C1 between the circular hole 6 and the outer peripheral surface 5a of the burring portion 5. C1a. When a rotating power is applied to the arm member 1 by a driving means (not shown), the circular shaft 7 is guided on the inner peripheral surface 5b of the burring portion 5 (when C2a = C1a, the circular hole 6 is also connected to the burring portion). The shaft rotating component 3 rotates around the rotation axis A while being guided by the outer peripheral surface 5a of the shaft 5).

The displacement of the shaft rotating component in such a configuration will be described below. The axial rotation part 3 is displaced by a maximum of C2a in a horizontal direction H (a direction perpendicular to the rotation axis A) indicated by an arrow. In the position displacement state of the maximum C2a, the circular shaft 7 of the shaft rotating component 3 receives a load from the inner peripheral surface 5b of the burring portion 5, but is hardly deformed because the circular shaft 7 is a solid shaft, so that a larger position is obtained. There is little risk of displacement. In addition, since C2a ≦ C1a, the positional deviation amount is smaller than that of the conventional art shown in FIG. 4, and the positional deviation of the arm member 1 can be suppressed.

As shown in FIG. 2, the pivoting part 3 is tilted at an angle θ with respect to the pivot axis A at the fulcrum P, and with this tilting, the end 1 a of the arm member 1 is raised. A deviation occurs in the vertical direction V (the direction of the rotation axis A). Here, in FIG. 2, for convenience, the pivoting part 3 is tilted at the fulcrum P, and the corner 7 b of the circular shaft 7 of the pivoting part 3 is in contact with the inner peripheral surface 5 b of the burring part 5. It becomes the maximum tilt state at. Assuming that the distance from the fulcrum P to the corner 7b of the circular shaft 7 of the shaft rotating component 3 is R2, the maximum value θb of the angle θ is approximated by θb = C2a / R2 (3). Assuming that the distance from the rotation axis A of the arm member 1 to the end 1a is L, the maximum value Vb of the displacement of the end 1a in the height direction V is given by the following equation (3): Vb = L × θb = L × C2a / R2 (4)

Therefore, as compared with the prior art shown in FIGS. 4 and 5, since R2> R1 and C2a ≦ C1a, θb <θa is derived from the equations (1) and (3), and the equation (2) ) And Equation (4) lead to Vb <Va. In other words, the tilting of the shaft rotating component 3 can be suppressed, and the displacement of the end portion 1a of the arm member 1 in the height direction V is suppressed, so that the height accuracy of the end portion 1a is improved. It becomes possible. For example, when a rotating pole or the like for guiding the VTR tape is provided at the end 1a, troubles are less likely to occur during loading and unloading.

FIG. 3 shows an example of a device on which such a shaft rotating component 3 is mounted. 3A and 3B are plan views showing a general internal structure of the VHS system VTR. FIG. 3A shows a state before loading, and FIG. 3B shows a state after loading. I have. The above-mentioned arm member 1 corresponds to a supply loading arm 21 and a take-up loading arm 22, and the like. In addition, at the positions corresponding to the ends 1a, 1a of the supply loading arm 21 and the take-up loading arm 22, rotating poles 24, 24 for guiding the VTR tape 23 are provided.

The general operation of loading will be described below. The VTR tape 23 is wound around a supply reel 25 and a take-up reel 26 and stored in a cassette tape 27 (see FIG. 3A). When loading is started, the supply loading arm 21 and the take-up The loading arm 22 rotates about the respective rotation axes A, A. With this rotation operation, the VTR tape 23 is pulled out horizontally by the rotation poles 24, 24 provided respectively. Next, the VTR tape 23 is pressed against the rotating head drum 28 by the action of the rotating poles 24, 24 to form an M shape, and the VTR tape 23 is loaded (see FIG. 3B). Here, the rotation pawls 24, 24 are required to guide the VTR tape 23 with high positional accuracy, but since the positional deviation is suppressed as much as possible by the shaft rotating parts of the present invention, troubles are hardly caused.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the arm member 1 may be other than the loading arm of the VTR as long as it has the rotation axis A, and the burring portion 5 provided on the support plate 2 may be upright along the through hole 4. It may be an annular component protruding from the vehicle.

[0020]

[Effect of the invention]

 As described above, according to the present invention, the support plate having the circular through hole is provided with the burring portion that stands up along the through hole, and the burring portion is rotatable with respect to the burring portion. In a shaft-rotating component having a columnar shape and having a circular hole which is loosely fitted on an end surface thereof with an outer peripheral surface of the burring portion at a predetermined gap, at least one of the inner peripheral surface of the burring portion protrudes from the bottom of the circular hole. A circular shaft that fits loosely within the gap and that has an end protruding from the end surface is provided and is attached to the rotating shaft of the loading arm of the VTR. The displacement and tilt in the direction perpendicular to the axis are suppressed. Therefore, the displacement and tilting of the loading arm to which the shaft rotating component is attached can be suppressed, so that the position accuracy of the end of the loading arm is stabilized. For example, the VTR tape is guided to the end. When a rotating pole or the like is provided, troubles are less likely to occur during loading and unloading.

The support plate having the circular through-hole is provided with an annular protrusion that stands along the through-hole and has the same inner diameter as the diameter of the through-hole. A shaft hole which is rotatable and has a circular hole which is loosely fitted in the outer peripheral surface of the annular protrusion at a predetermined gap with the outer peripheral surface of the annular protrusion, protrudes from the bottom of the circular hole, and is slightly less than the inner peripheral surface of the annular protrusion. If a circular shaft that fits loosely below the gap is provided, the displacement of the shaft rotating component in the direction perpendicular to the rotating shaft is suppressed as compared with the related art.

Further, the pivoting part is cylindrical, and the circular hole is formed in the end face thereof. When the end of the circular shaft projects beyond the end face, the pivoting part can be easily formed. In addition to that, the tilting of the shaft rotating component with respect to the rotating shaft is suppressed as compared with the related art.

Further, when the shaft rotating component is attached to the rotating shaft of the arm member, it is possible to easily obtain a rotatable arm member that requires positional accuracy at the end.

When the annular projection is provided by burring molding, the annular projection can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotating shaft part of the present invention.

FIG. 2 is a cross-sectional view illustrating a tilted state of the rotating shaft component of the present invention.

FIG. 3 is a plan view showing an internal structure of a VHS type VTR which is an example of a device on which the rotating shaft component of the present invention is mounted.

FIG. 4 is a sectional view of a conventional shaft rotating part.

FIG. 5 is a cross-sectional view illustrating a tilted state of a conventional shaft rotating component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arm member 2 Support plate 3 Shaft rotating part 4 Through hole 5 Burring part 6 Circular hole 7 Circular shaft

Claims (5)

[Utility model registration claims] 1. A support plate having a circular through-hole formed therein is provided with a burring portion that stands up along the through-hole, and has a cylindrical shape rotatable with respect to the burring portion.
A shaft rotating part having a circular hole formed on its end surface to fit loosely with the outer peripheral surface of the burring portion with a predetermined gap, protruding from the bottom of the circular hole, and at least not more than the gap with the inner peripheral surface of the burring portion. A shaft rotating part, which is provided with a circular shaft that is loosely fitted and whose end protrudes from the end surface, and is attached to a rotating shaft of a loading arm of a VTR. 2. A support plate having a circular through hole formed thereon is provided with an annular protrusion standing up along the through hole and having the same inner diameter as the diameter of the through hole. An axially rotating part formed with a circular hole that is axially rotatable and that loosely fits into the outer peripheral surface of the annular projection with a predetermined gap, protrudes from the bottom of the circular hole, and at least the gap with the inner peripheral surface of the annular projection. A shaft rotating part provided with a circular shaft to be loosely fitted below. 3. The shaft rotation according to claim 2, wherein the hole is formed in a cylindrical shape, and the circular hole is formed in an end surface thereof, and an end of the circular shaft projects beyond the end surface. Moving parts. 4. The shaft rotating component according to claim 2, wherein the shaft rotating component is attached to a rotating shaft of the arm member. 5. The shaft rotating component according to claim 2, wherein the annular projection is provided by burring molding.