JP2016210377A - Movable frame device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable frame device which can effectively suppress vibration of a movable frame during travelling.SOLUTION: A movable frame device has a pair of parallel travel rails 2 and a movable frame travelling on the rails in which the movable frame comprises a support part 4 on which a movable medium can be located, and plural wheel units 5 which are located on a lower surface side of the support part 4, the wheel unit 5 has a pair of left and right wheel parts 50 in which two wheels are inclined in a direction such that said two wheels are separated downwards from each other, and at least two sets of said paired wheel parts are located in a movement direction of the movable frame.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a mobile gantry device that travels on a rail track.

  2. Description of the Related Art Conventionally, a mobile photographing device equipped with a camera is known as a mobile gantry device that travels on a rail track. As a mobile imaging device, for example, a rail is laid in the direction in which the camera is moved, a moving gantry with wheels running on the rail is arranged on the rail, and the camera is attached to the moving gantry via a pan head The structure is known (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-47935

  Since the rail used for the above-described mobile gantry device (moving imaging device) is divided into a plurality of pieces that can be assembled on site, a plurality of joints exist in the assembled rail. In addition, there are often multiple scratches on the surface of the rail due to transportation conditions and aging degradation. Therefore, when the movable frame on which the camera is attached passes through the joint portion and the scratched portion on the rail described above, the vibration due to the step is transmitted to the camera via the platform. Then, there is a problem that the camera vibrates and blurs and noises are generated in the image, and a smooth moving shot cannot be taken.

  The above-described problem of vibration suppression during traveling of the mobile gantry is not limited to the mobile imaging device, and is the same for all mobile gantry devices that travel on rail tracks.

  An object of one embodiment of the present invention is made in view of the above-described problems, and is to provide a mobile gantry device that can effectively suppress vibration during travel of the mobile gantry.

The above issues
A mobile gantry device having a pair of parallel traveling rails and a movable gantry that travels on the traveling rails,
The mobile platform is
A support unit capable of installing a moving medium on the top, and a plurality of wheel units installed on the lower surface side of the support unit;
The wheel unit is characterized in that at least two pairs of left and right wheel portions inclined in a direction in which two wheels are spaced downward from each other are arranged in the moving direction of the moving stand. Can be solved.

  ADVANTAGE OF THE INVENTION According to this invention, the mobile gantry apparatus which can suppress effectively the vibration at the time of driving | running | working of a mobile gantry can be provided.

It is a whole perspective view which shows an example of the use condition of the mobile gantry device concerning the embodiment of the present invention. It is the elements on larger scale which show the relationship and structure of a traveling rail and a movable mount frame. It is a partial expansion perspective view which shows the structure of a wheel unit. It is a bottom view which shows the structure of a wheel unit. It is a longitudinal cross-sectional view which shows the structure of a wheel unit.

  Next, an embodiment of the mobile gantry device according to the present invention will be described. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description thereof will be simplified or omitted as appropriate. The drawings are not intended to show the relative ratio between members or parts. Accordingly, specific dimensions can be determined by one skilled in the art in light of the following non-limiting embodiments.

  Hereinafter, the mobile gantry according to the present invention will be described by taking as an example a configuration in which a camera is mounted on the mobile gantry. However, the present invention is not limited to this, and a device other than the camera can be mounted and implemented with the same configuration.

  FIG. 1 is an overall perspective view showing an example in which a camera C is mounted as a mobile gantry device 1 according to the present embodiment. FIG. 2 is a partially enlarged view showing the relationship and configuration between the traveling rail and the movable frame.

  The basic configuration of the movable gantry device 1 includes a pair of parallel traveling rails 2 and a movable gantry 3 that travels on the traveling rails 2. The mobile gantry device 1 (moving imaging device) of the present embodiment is suitably applied to a small one.

  The traveling rail 2 is laid along the direction of moving the camera C, and may be a pipe material having a circular cross-sectional shape. The traveling rail 2 is divided into a plurality of pieces and is connected to each other and formed to have a certain length. Therefore, a plurality of joints are formed on the traveling rail 2 of the present embodiment.

  The mobile gantry 3 includes a support unit 4 on which the camera C can be installed as a moving medium, and a plurality of wheel units 5 installed on the lower surface side of the support unit 4.

  The support portion 4 includes a main body plate 41 extending in parallel with the traveling rail 2 and a connecting plate 42 extending in a direction orthogonal from the substantially central portion of the main body plate 41. That is, the support portion 4 is formed so as to be T-shaped when viewed from above. The main body plate 41 and the connecting plate 42 are metal channel members. Of course, this is not restrictive, and pipe material may be used.

  As shown in FIG. 2, the support part 4 of this embodiment is connected by the structure which the main body board 41 and the connection board 42 can isolate | separate. Specifically, both of them are joined by bolts 43 and can be disassembled only by loosening the bolts 43.

  2. Description of the Related Art Conventionally, a T-shaped support portion of a moving gantry used in a moving photographing apparatus generally has a configuration in which a main body plate and a connecting plate are rotated and folded at a connecting portion. However, in the case of the folding type, the assembling work becomes easy, but since the folded state is fixed uniformly, there are cases where it cannot be stored in the trunk for transportation. In that respect, since the support part 4 of this embodiment is a structure which can disassemble the main body board 41 and the connection board 42, it can contribute to the compact accommodation at the time of conveyance.

  On the upper surface of the support portion 4, that is, the upper surfaces of the main body plate 41 and the connecting plate 42, three leg portions 7 that support the pan head 6 that can freely move the camera C up and down, turn, tilt left and right, and move up and down are standing. It is installed. The leg portion 7 has a three-leg structure erected from three positions, that is, both end positions (arrow X1 side and X2 side) of the main body plate 41 and one end (arrow Z1 side) end position of the connecting plate 42. .

  Although the simplified leg portion 7 is shown in the illustrated example, it is preferable that a height adjusting mechanism capable of sliding movement in the height direction (arrow Y1-Y2 direction) is mounted. Although not shown in the figure, the leg portion 7 and the support portion 4 may be detachably connected.

(Wheel unit)
Next, the wheel unit 5 attached to the lower surface side of the support part 4 is demonstrated based on FIGS. FIG. 3 is a partially enlarged perspective view showing the configuration of the wheel unit 5, and shows a state where the wheel unit 5 is placed and contacted on the traveling rail 2. FIG. 4 is a bottom view showing the configuration of the wheel unit 5. FIG. 5 is a longitudinal sectional view showing the internal configuration of the wheel unit 5. FIG. 5 is a longitudinal sectional view when viewed in the arrow X1 direction from the arrow X2 side in FIG.

  The present invention is characterized by the configuration of the wheel unit 5. In particular, there is an advantage in that a configuration for absorbing vibration during traveling of the mobile gantry 3 is mounted.

  One unit of the wheel unit 5 of the present embodiment is provided on the bottom surface of each end portion of the support portion 4 having a T-shape. That is, there are three units at both end positions (arrow X1 side and X2 side) of the main body plate 41 and one end (arrow Z1 side) end position of the connecting plate 42. Since the wheel unit 5 provided at any position has the same configuration, a specific configuration will be described below by taking as an example the wheel unit 5 disposed at the end of the connecting plate 42 on the arrow Z1 side.

  The wheel unit 5 includes at least two pairs of left and right wheel portions 50 that are inclined in a direction in which the two wheels 51 and 52 are spaced downward from each other in the moving direction (arrow X1-X2 direction) of the moving gantry 3. It is supposed to be configured.

  In the illustrated example of the wheel unit 50, the wheel 51 located outside the traveling rail 2 is described as 51, and the wheel located inside the traveling rail 2 is described as 52. The wheel 51 and the wheel 52 are configured to be in contact with each other so as to be inclined in a C shape and sandwich the upper half surface of the traveling rail 2.

  Generally, a configuration is known in which one wheel having an outer peripheral surface that is in contact with the traveling rail 2 formed in a V-shape travels in a state of sandwiching the traveling rail. However, the configuration in which the wheels 51 and 52 that are inclined in a C shape sandwich the upper half surface of the traveling rail 2 as in the present embodiment is stable regardless of whether the traveling rail 2 has a large or small diameter. Can be used to achieve smooth slide movement with little play. Therefore, there is an advantage that versatility and stability are rich.

  The wheel unit 5 of the present embodiment is configured by arranging two sets of the wheel portion 50 having the above configuration in the movement direction (arrow X1-X2 direction). That is, this is a configuration in which four wheels are arranged for one wheel unit 5. Therefore, since the traveling rail 2 is sandwiched between the four wheels, the sliding traveling of the movable frame 3 is more stable.

  Furthermore, when the wheel unit 5 of the movable gantry 3 passes through the joint portion or scratched portion of the traveling rail 2, the four wheels arranged in the wheel unit 5 can absorb vibrations. Since three wheel units 5 are arranged, the mobile gantry 3 can absorb vibrations with a total of twelve wheels, so that the vibration absorption rate can be dramatically increased as compared with the conventional mobile gantry device.

The wheel unit 5 of this embodiment has a configuration that absorbs vibrations.
In the wheel unit 5 of the present embodiment, as shown in FIG. 4, the wheel 51 and the wheel 52 constituting the wheel unit 50 are arranged so that the placement contact lines 51 </ b> T and 52 </ b> T with the traveling rail 2 move in the moving direction (arrow X <b> 1-X <b> 2 direction). ). More simply, the position of the wheel 52 (or the wheel 51) is shifted from the position of the wheel 51 (or the wheel 52) to the left side (or the right side (arrow X2 side or arrow X1 side) by about 7 mm. Of course, the other wheel unit 50 is similarly configured such that the placement contact lines are shifted.

  The placement contact line 51T indicates the center line of the contact surface where the wheel 51 contacts the traveling rail 2, and the placement contact line 52T indicates the center line of the contact surface where the wheel 52 contacts the traveling rail 2.

  As described above, since one of the wheels 51 and the wheels 52 is shifted to the left (or right) by about 7 mm, when the wheel unit 5 of the movable gantry 3 passes through the joint or scratched portion of the traveling rail 2. In the wheel 51 and the wheel 52, the timing of hitting the joints or scratches is shifted. Then, compared with the case where the position of the mounting contact line of the wheel 51 and the wheel 52 is on the same line, the vibration can be drastically reduced.

  The wheel unit 5 in the illustrated example shows an example in which the wheel 52 is shifted 7 mm to the left (arrow X2 side) from the wheel 51, but this is not restrictive. The shift amount to the right side or the left side can be changed as appropriate, and which one is shifted can be changed as appropriate.

The wheel unit 5 of the present embodiment further includes a configuration that absorbs vibration.
A specific configuration of the wheel unit 5 of the present embodiment will be further described.
The wheel unit 5 includes a triangular pyramid-shaped support main body 53 that supports two sets of wheel portions 50, an attachment shaft portion 54 that connects the support main body portion and the support portion 4 (connection plate 42), and an attachment shaft portion 54. A ball bearing 55 disposed above, and a buffer means 56 interposed between the support body 53 and the support 4 are provided (see FIG. 5).

  The triangular pyramid-shaped support main body 53 has a horizontal plane 53a on the upper surface and a V-shaped inclined surface 53b on the lower side. By connecting the left and right wheels 51 and the shaft portions 51a and 52a of the wheels 52 to the two V-shaped inclined surfaces 53b, the wheels 51 and the wheels 52 can be arranged in a letter C. An attachment hole that can be fitted to the lower end portion of the attachment shaft portion 54 is provided at a substantially central portion of the horizontal surface 53 a of the support main body portion 53, and is connected to the support portion 4 via the attachment shaft portion 54.

  The vibration generated when the wheel unit 5 passes through the joint portion or scratched portion of the traveling rail 2 is finally transmitted to the camera C via the attachment shaft portion 54. Therefore, it is preferable that the mounting shaft portion 54 is provided with a configuration for absorbing vibration.

  As a configuration for absorbing vibration, the ball bearing 55 and the buffering means 56 described above are fitted around the mounting shaft portion 54.

  As shown in FIG. 5, the ball bearing 55 is disposed between the lower end surface of the flange portion 54 a formed above the mounting shaft portion 54 and the inner surface of the lower end surface of the support portion 4. Further, the buffer means 56 is positioned below the attachment shaft portion 54 and is disposed between the support main body portion 53 and the support portion 4. Incidentally, a washer 57 and an aluminum collar 58 are mounted on the outer peripheral surface of the mounting shaft portion 54 between the ball bearing 55 mounted on the mounting shaft portion 54 and the buffering device 56. It is possible to load a certain compressive force.

  The buffer means 56 of this embodiment may be formed by laminating two types of resin materials having different vibration absorption characteristics. As the resin material of the present embodiment, a cushion material made of urethane is used. Of course, the material is not limited to this, and any material having an elastic force may be used. The buffer means 56 of the present embodiment is preferably formed in a three-layer structure in which a resin material 561 having a high vibration absorption characteristic among two types of resin materials is sandwiched between resin materials 562 having a low vibration absorption characteristic.

  Of course, the lamination relationship between the resin material 561 and the resin material 562 is not limited to that shown in the drawing, and may be reversed. In addition, although an example in which the resin material 561 and the resin material 562 are alternately stacked to form a three-layer structure is shown, a three-layer structure or more may be used.

  Therefore, since the vibration that could not be absorbed by the wheels 51 and 52 of the wheel unit 5 is effectively absorbed by the ball bearing 55 and the buffer means 56 before the support portion 4, the wheel unit 5 travels on the traveling rail 2. It is possible to effectively absorb the vibration at the time of shooting and to cause the camera C to take a smooth and stable image. In particular, the shock absorbing means 56 can further improve the vibration absorption effect by using two kinds of resin materials having different vibration absorption characteristics.

  As described above, the mobile gantry device 1 according to the present embodiment includes the wheel unit 5 having four wheels by arranging two pairs of left and right wheel portions 50. The mobile gantry device 1 has three wheel units 5 arranged therein. Further, the two wheels 51 and 52 constituting the pair of wheel portions 50 are configured such that the placement contact lines 51T and 52T with the traveling rail 2 are shifted in the moving direction.

  Therefore, the vibration generated when the wheel unit 5 travels on the traveling rail 2 and passes through the joint portion and the scratched portion can be absorbed by four wheels per unit, or 12 wheels as a whole. Not only that, the timing at which each wheel hits the joints and scratches of the running rail 2 is shifted to each other, so that the vibration can be drastically reduced.

  Further, the mobile gantry device 1 of the present embodiment has a buffer between the support unit 4 and the wheel unit 5 to which vibration generated when the wheel unit 5 passes through a joint portion or a scratched portion of the traveling rail 2 is transmitted. The means 56 is provided.

  The position where the vibration is transmitted is the position of the mounting shaft portion 54 in this embodiment, and the buffer means 56 is formed by alternately stacking three layers of resin materials having two different types of vibration absorption characteristics on the mounting shaft portion 54. Was provided.

  Therefore, the vibration that the wheels 51 and 52 of the wheel unit 5 could not absorb is effectively absorbed in front of the support portion 4 to move the camera C smoothly and stably. ) Can be captured.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

DESCRIPTION OF SYMBOLS 1 Mobile mount apparatus 2 Traveling rail 3 Support mount 4 Support part 41 Main body board 42 Connection board 5 Wheel unit 50 Wheel part 51 Wheel (outside)
51a Shaft 52 Wheel (Inside)
52a Shaft 53 Support body 53a Horizontal surface 53b Inclined surface 54 Mounting shaft 55 Ball bearing 56 Buffering means 57 Washer 58 Collar

Claims (4)

A mobile gantry device having a pair of parallel traveling rails and a movable gantry that travels on the traveling rails,
The mobile platform is
A support unit capable of installing a moving medium on the top, and a plurality of wheel units installed on the lower surface side of the support unit;
The wheel unit is characterized in that at least two pairs of left and right wheel portions inclined in a direction in which two wheels are spaced downward from each other are arranged in the moving direction of the moving stand. . The pair of left and right wheels are
It is placed and contacted on the traveling rail disposed between the inner surfaces of the pair of left and right wheels,
2. The mobile gantry device according to claim 1, wherein a mounting contact line between the two wheels constituting the pair of right and left wheels is shifted in a moving direction.   The mobile gantry device according to claim 1, wherein a buffer means is provided between the support portion and the wheel unit. The buffer means is
4. The mobile gantry device according to claim 3, wherein a resin material having a low vibration absorption characteristic and a resin material having a high vibration absorption characteristic are alternately stacked to form at least a three-layer structure.

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