JPS59187193A - Rotary mechanism of universal-head for photographing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera platform for use in dynamic photography such as video cameras and cine cameras.

The above-mentioned camera head is required to have smooth rotation (horizontal rotation) and tilt (vertical rotation), and the above-mentioned rotation must be performed without idling and without being too heavy. It is required that an appropriate rotational resistance be provided without any friction, and that the strength of the rotational resistance be adjusted in accordance with the shape and weight of the camera attached to the pan head.

Conventionally, as a simple known means to satisfy the above requirements, as shown in FIG. A tilt shaft (one shaft is provided, and the housing a for the tail is rotatably inserted into the tilt shaft, and the tilt shaft α and the housing (Is upper and lower surfaces are through-holes A4 for the on-axis) Q!9 are formed by communicating with each other, and the above-mentioned through hole 0 minute O
Insert the retaining screw α from the open end surface of the tilt shaft u2 into the retaining groove an formed in the pan axis 061, passing through the ξ axis (IO)
υ is screwed in, and a viscous fluid such as grease is inserted into the gap α between the tilt axis (I2) and the tilt shaft 0 stage, and between the ξ axis (the gap (4) between Io and the inner wall of the through hole α 9). There existed a structure in which the contact 1!i! friction of the rotating part was reduced and rotational resistance was obtained by filling the rotating part with . However, in the above structure, it is difficult to select a viscous fluid in order to obtain an appropriate rotational resistance without idling or making the rotation too heavy. Precise accuracy is required so that the gap Ql between the housing α floor, the gap Ql between the pan shaft (6) and the through hole A, and the gap between the inner wall (A) are the most appropriate. is almost impossible in the Dai-Fij production school, and it is also impossible to adjust the degree of rotational resistance in the above-mentioned Fijian.Therefore, as shown in Figure 2, a means has been developed that allows the strength of the rotational resistance to be adjusted. That is, the camera stand (10a)
Hanging pieces (10b) hanging symmetrically downward from both edges of
) (10c) Fit the tilt housing part Oυ formed on the upper part of the rotary table (to) between them, fit the horizontal shaft 03 into the housing color υ with a gap (b), and then A pressure ring pressing plate 0 (g) is interposed in the gap (b), a gap (to) is formed between the pressing plate 09 and the tilt housing Gυ, and the pressure ring suppressing plate 0!9 is placed in the above state.
and the tapered grooves t37)t3gj provided at the upper corners of the opposing surfaces of the tilt housing Gυ, respectively,
Install an oval pressure ring into the housing part (b). Pass through the tilt shaft 02, the pressure ring pressing plate (c), and the tilt shaft (c) from the outside of one hanging piece (iob), and screw in the rotation resistance knob (41 screw rod part (4υ). (4+) has a knob portion (a stepped portion (401) formed by forming the knob portion with a smaller diameter than the screw base portion (40a) which is continuous with 411), and the stepped portion (40b).
is locked to the pressure ring suppression plate (G).

The lower surface of the tilt axis C32 (to) and the pressure ring suppression plate (c) are supported on a rotary table (7) having a downward opening and a U-shaped cross section, and a support table is provided in the U-shaped interior of the rotary table (7). (Fit the on-shaft o3, which has a U-shaped cross section with an open bottom fixed to the pan shaft (4), and connect the pan shaft (4-shank side) to the pan housing (30a) inside the U-shaped pan of the rotary table (to). The annular leaf spring f44 is attached in contact with the upper surface of the U-shaped interior of the pan shaft (43).
1 is fixed with four mounting bolts, and a viscous fluid is interposed between the bottom surface of the rotating table (top) and the top surface of the pan shaft (4'3), and the pan shaft (4th floor is placed in a U-shaped In Fig. 2, (40 is a camera mounting screw, (47) is an O-ring.In the above-mentioned known means, the rotation resistance knob (4G is screwed). By pushing the pressure ring suppressing plate (c) to the right side in Fig. 2, the diameter of the pressure ring G is expanded by the movement of the pressure ring suppressing plate 0ω, and it is pressed against the inner wall of the tilt housing Oυ. The frictional resistance provides rotational resistance on the tilt side.Furthermore, on the pan side, a ring-shaped leaf spring (4 snares) presses the pan shaft (bone) against the back surface of the rotating table (7).

In the known means shown in FIG. 2 above, the rotational resistance of the tilt portion is due to frictional resistance due to the pressure ring C (I), so the rotational resistance N'j + Th?i is possible, but the smoothness of rotation is In addition, the rotational resistance of the pan section cannot be adjusted.

The present invention makes the tilt mechanism unit and the pan mechanism unit removable from the pan head main body, which simplifies assembly and repair, and also provides smooth rotation and tilt, and prevents idle rotation. - It is an object of the present invention to provide a pan head for photography that not only provides an appropriate rotational resistance without causing too much rotation, but also allows the strength of the rotational resistance to be adjusted.

The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 3 shows a longitudinal cross-sectional view of the present invention, showing a tilt mechanism unit (A) and a tilt mechanism unit (B).
is formed separately from the panhead body (a). Head main body
is the camera stand (50a) with the camera mounting screws (to) attached.
) of the support side edge of the tilt mechanism (s
a stopper edge (50(1)) which is separate from the support side edge and which faces the support side edge and bends upward and inward; A tilt mechanism unit accommodating portion 61) is formed in the gap between the side edges.The support side edge (5od) is supported below the tilt mechanism unit accommodating portion 6υ (111!+edge (50
b) side to form a horizontal bent edge (50e), and the horizontal layer'a edge has a supporting side edge (50b) (50d).
) directly below the hanging edge (
50f) (50g), and a pan mechanism unit housing portion 63 is formed between the hanging edges.

Tilt Mechanism Unit) (A) As shown in Figures 4 and 5, the housing (7) is fitted into the rotor (60) so as to be rotatable in the tilt direction, and the rotor [F]0)
has iJ several cylinders, ideally an odd number of cylinders (il)ffil)[F]υ of the fourth
Longitudinal section X-X' of the rotor 60) shown in Figure x-x'
The pistons 6 are formed in a radial shape as shown in FIG. 5, and a piston 6 is installed in each cylinder [F]υ.

A valve chamber 0 is provided at the center of the longitudinal section of the rotor mortar, and a throttle # (goods) is accommodated in the valve chamber, and a spring t13 is attached to a tilt resistance screw (CJ4) OllI, which will be described later.
It is pressed by Q and locked by a retaining ring trowel'. The above-mentioned valve chamber - and each cylinder (fil) II) are communicated with each other by a flow path transfer iron, and the cylinder (61-ring, valve chamber -
The flow path IED is filled with a working fluid such as cylinder oil. The plow has a narrowed part [with] a ball/hole valve which is provided on the side opposite to the direction of the adjustment screw α◇ of the valve chamber [F]■, and is fitted with a ball, and the 6th part is a set screw. A ball bearing συσυσ is attached to the rotor configured as above.
A ring-shaped housing vO) is placed on the exterior through the village 2.

(75a) (75b) C750) (75a) is an 0 ring. The above housing '(7)
The inner peripheral surface of the ring of the housing (γ0) has a circular shape centered around the axis (Y-Y'). It is formed. Therefore, the wall thickness of the housing (10) is formed so that it gradually becomes thinner from the thick part. A @ made ring σ→ is attached to the inner peripheral surface of the housing σω, and the tip of the piston 6 and the steel ring σ are always in contact with each other. As shown in FIG. 3, the tilt mechanism unit (A) configured as described above is accommodated in the tilt mechanism unit accommodating portion 5+)ζ and fixed with the fixing screws 54)(5).
It is fixed with heat, and a tilt resistance adjustment screw (74) is screwed in from the outside located on the end face side of the choke well in the housing part δυ so that its tip can come into contact with the rear end face of the squeeze well.

- As shown in Figures 6 to 8, in the ξn mechanism unit (B), a shaft rod ■' is protruded below the rotor ■, and a housing rod is fitted into the rotor so as to be rotatable in the pan direction. ing. A plurality of cylinders, ideally three or more and an odd number of cylinder bells υ@0, are formed in the rotor so that they form a radial shape in the cross section of the rotor blade, and a piston hole is installed in each cylinder υ. It is being In addition, a valve chamber is provided above each cylinder C8υ, and the valve chamber (
The throttle lever (B) is accommodated in the pan resistance adjustment screw 0 (see above) and compressed by the spring (4). The valve chamber (8I), the valve chamber, and the flow path (86) are filled with working fluid such as cylinder oil. η is the adjustment screw of the valve chamber ■. (
It is a ball/lube fitted into a narrowed part provided on the opposite side to the direction of 94), and the handle is a set screw. A housing frame having a U-shaped cross section with an upper opening is mounted on the lower surface of the rotor constructed as described above via a ball bearing a'D (9a) (75a, ) (75b)
(75c) (7!5a) is the 0 ring. The above
The housing is configured to rotate in the center and ξ directions around the axis (x-x') of the rotor, and the inner peripheral surface of the ring is centered around the axis (X-X'). It is formed into an eccentric circular shape. Therefore, the wall thickness of the housing is formed so that it gradually becomes thinner from the thicker portion. A steel ring (1) is attached to the inner circumferential surface of the above-mentioned rolling iron, and the tip of the piston (1) and the steel ring (9) are always in contact with each other.

(to) is a sleeve provided in the housing, and the ball bearing 021 serves as a thrust bearing. And then the shaft hit'
is fixed to the end surface of the sleeve (()) with a nut.The pan mechanism unit (B) configured as described above is accommodated in the pan mechanism unit housing part as shown in Fig. 3, and the fixing screw #@ 〒Fix.The above-mentioned storage part (the outer side located on the end face side of the squeezed fruit (goods) of 521, that is, the front side (50f)
Screw in the resistance adjustment screw (from 1 to 2) so that its tip can come into contact with the rear end surface of the aperture. The sleeve (E) is screwed onto the pan head support shaft (9 screws).

Piston and housing part 91, σ
It is necessary to reduce the static friction between the tip of the former and the inner peripheral surface of the latter as much as possible. For this purpose, hard urethane is used at the tip of the giston, and a ground steel ring σ3 is used on the inner circumferential surface of the housing to reduce friction on the material surface as well as the inner circumference of the housing (7f) (a). shows an implementation in which a viscous fluid such as highly adhesive grease is sealed to prevent frictional resistance between the tip of the piston haze and the inner periphery of the housing σGal as much as possible. Alternatively, an ultra-small ball bearing may be used at the tip of the piston &+3@a. Next, the number of pistons (6H3) is preferably an odd number of 3 or more because it is desirable that the discharge amount and suction amount by each piston during rotation are gradient.Also, the number of pistons (6H3) is preferably an odd number of 3 or more. If the tip of the wheel and the inner circumference of the housing σQσQσ are not in constant contact with each other, it may cause rotational play.
It is desirable that internal pressure is generated in the working fluid from the beginning. Ball no norupu.

Inη and the set screw Gω@ω are means for achieving the above purpose while simultaneously releasing air during assembly. In addition, in order to increase rotational resistance, pushing the squeeze well I-Xu to the left in Figure 4 or pushing the squeeze well to the right in Figure 7 will generate even more internal pressure, which will prevent oil from decreasing over time. It also provides security. However, in the above method, the 2nd tip of the piston (goods) and the housing (7Q
The contact pressure with the inner periphery of the valve will also increase, potentially causing harmful friction, so in order to avoid this, the valve chamber vAJa
A drum-shaped valve or the like whose volume does not change or whose volume changes little may be used. Next, the shape of the curvature part td of Shibori Noboru 14) (Foundation) has a certain degree of chi as shown in Figures 3 and 6.
Forming a groove will provide more stable rotational resistance. The ball bearing trvct319υo reduces harmful friction and is subject to the radial loads that are unavoidable in the present invention. O-rings (75a) (75b) (75d) are for preventing leakage of working fluid! be. O-ring (75c)
(75e) is for preventing leakage of grease for reducing friction between the top end of the piston and the inner periphery of the housing, and has a structure that is easy to assemble because the internal pressure is low.

Next, the present invention will be explained in detail as follows.

To operate the tilt mechanism, adjust the tilt rotation resistance adjustment screw σ of the tilt mechanism unit (A) shown in Figure 3, and adjust the camera mounting screw to the camera stand (50a) according to the weight of the camera installed. J that gives rotational resistance,
When screwing in the tilt rotation resistance adjustment screw, the throttle moves to the left side in Figure 3 against the repulsive force of the spring, and the working fluid in the valve chamber moves to the left side of each flow path ( 6■0 (to)
It is fed under pressure into the cylinder 6υ[F]υ6η. Next, when the camera pan head (50a) is tilted and rotated, the housing σ[ rotates around the rotor axis (Y-Y') in the ball bearing (7υQυ, (1zσ2 part). At this time, the housing σ[ Because the circumferential surface is eccentric, about half of the pistons are compressed, pushing the working fluid inside the cylinder out of the flow path, and the pushed out working fluid flows into the throttle part of the throttle nose. ' is discharged into the valve chamber sinus while experiencing throttling resistance.The other half of the pistons □□□ are discharged into the valve chamber sinus as the pressure between them and the inner peripheral surface of the housing ffl decreases. The working fluid is sucked into the cylinder 61) while being subjected to throttling resistance again at the constricting portion d of the constrictor.

In general, the fluid restriction resistance increases as the →・force of the liquid passing through the restriction portion increases, and when the flow velocity is 0, the h resistance also becomes 0.

In the present invention, the flow velocity of the working fluid in each cylinder 6υ1l) 11) is determined by the flow rate of the working fluid in each cylinder 6υ1l) 11).
), so the resistance is small for slow rotations and large for fast rotations.

This is a necessary condition for manually operating the pan head to obtain smooth rotation. Also, by changing the degree of aperture, the resistance at the same rotation speed can be changed.

The operation of the span mechanism is similar to that of the tilt mechanism.

As described above, the present invention provides a tilt M structure unit, and
By making the gun mechanism unit removable from the head main body, it is easy to assemble and repair, and smooth panning and tilting can be achieved. This has the effect of providing a photographic pan head that is not too heavy and that not only provides an appropriate rotational resistance but also allows the strength of the rotational resistance to be adjusted.

[Brief explanation of the drawing]

FIG. 4 is a vertical cross-sectional view of a known camera pan head, FIG. 2 is a vertical cross-sectional view of another known camera pan head, and FIG. is a longitudinal sectional view of the tilt mechanism in Fig. 3, Fig. 5 is a transverse sectional view of the tilt mechanism in Fig. 3, the sixth factor is a longitudinal sectional view of the nokun mechanism in Fig. 3, and Fig. . 67 Mechanism cross-sectional view, No. 8
The figure is an enlarged view taken along line B-B in FIG. (A)... Tilt mechanism unit, (B)... Pan mechanism unit, 50... Pan head main body, (50a)...
Camera stand, (50b)... support side edge of tilt mechanism,
(50c)...stopper edge, (50d)...other support side edge, (50e) horizontal bent edge, (50f)
(50g)...Drooping edge, 5υ...Tail) [& unit accommodating part, 62...Pan mechanism unit accommodating part, (
5J...Camera additional screw, 6a (5...fixing screws, 60...rotor, 63+)...cylinder, pulp...piston, σ;9...valve chamber, [F]■ '...O
Ring, (Foundation)...Shibori fruit, Kasumi...Spring, ■
...Flow path, 6η...Dil Parzo, Release...Narrowing part, Trowel...Press screw, (70...Housing, συq3
...Ball bearing, (I5...Steel ring, σ
Xu... Tilt resistance adjustment screw, ■... Rotor, f
81)...Cylinder, @2...Piston, Can...
・Valve chamber, (Foundation)... Throttle valve, (C)... Spring, Window... Channel, Part η... Seel no Norubu, (A).
・・Narrowing part, ridge...Press screw, (To)...Housing, (911695...Ball bearing, (G)...
・Steel ring, (Foundation)... Pan resistance adjustment screw, 0 (T)... Sleeve, (T)... Nut, Ka... Fixing screw, ((T)... Pan head Support bird 1 picture

Claims (1)

[Claims] Each unit is housed in a tilt mechanism unit accommodating section and a pan mechanism unit accommodating section provided in the pan head main body to constitute a tilt and . The rotor rotates around the central axis of the rotor, and the rotor has a plurality of cylinders arranged radially with respect to the central axis, and a piston is fitted into each cylinder. and a valve chamber provided in the rotor are communicated by a flow path, a throttle nut is fitted in the valve chamber, and its rear end is supported elastically by one of the valve chambers, and the housing has an inner circumferential surface that is connected to the valve chamber. By filling the cylinder, flow path, and valve chamber of the rotor, which is formed eccentrically with respect to the central axis, with working fluid, the tip of each piston is configured to be able to contact the inner peripheral surface of the housing, and the side surface of the tilt mechanism unit housing part, Rotation resistance adjustment screws are screwed into the side surfaces of the and gun mechanism unit accommodating parts, and the tips of the screws are formed so as to penetrate through the rotor and suppress the rear end of the aperture in the husband's valve chamber. Rotation mechanism of camera platform.