JPH07332909A - Deflection measuring apparatus for cylinder drum - Google Patents

Abstract

PURPOSE:To provide a deflection measuring apparatus for a cylinder drum in which the setting of the drum to the apparatus can be easily and rapidly conducted and its measuring accuracy can be improved. CONSTITUTION:The shaft 14 of a cylinder drum 12 is placed on bearings 28, and the one end of the shaft 14 is brought into contact with a top 31. A belt 42 is inclined with respect to the perpendicular direction to the axial direction of the shaft 14, rotated in contact with the shaft 14, and the drum 12 is rotated. The deflection of the drum 12 is measured in this state by a deflection detector 60. Thus, since it is not necessary to center it, its setting is easily and rapidly conducted. Since the shaft 14 is rotated at an outer peripheral reference, the deflection of the shaft which occurs when centering is not accurately executed is eliminated, the stable rotation is obtained, and the accurate measurement can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake measuring device for a cylinder drum, and more particularly to a shake measuring device for a cylinder drum used for measuring shake of a VTR cylinder drum.

[0002]

2. Description of the Related Art In order to measure the shake of a VTR cylinder drum, a shaft of the cylinder drum is fixed to a rotary table, the rotary table is rotated, and a stylus of a shake detector is brought into contact with the cylinder drum. I was measuring.
And in the case of the conventional cylinder drum shake measuring device,
To fix the shaft to the rotary table, one end of the shaft is cantilevered by a scroll chuck, or both ends of the shaft are supported by a shaft center.

[0003]

However, the conventional shake measuring device for a cylinder drum has a drawback in that it takes time to perform centering and is inefficient. In addition, there is a drawback that the accuracy of the shake measurement deteriorates if the centering is not performed accurately. The present invention has been made in view of the above circumstances, and provides a shake measuring apparatus for a cylinder drum, which eliminates the need for centering, enables easy and quick setting of the cylinder drum, and improves the shake measuring accuracy. With the goal.

[0004]

In order to achieve the above object, the present invention provides a bearing for rotatably mounting a shaft of a cylinder drum, and one end of the shaft mounted as described above is brought into contact with the bearing. The contact member, which is the center of rotation of the shaft, is contact-rotated while being inclined with respect to the direction orthogonal to the axial direction of the shaft placed above, and the shaft is pressed against the contact member by the rotational component thereof. A rotating force transmitting device for rotating the rotating force transmitting device, a driving unit for driving the rotating force transmitting device, and a detecting device for detecting a shake of a drum of a cylinder drum rotating together with the rotating shaft. To do.

[0005]

The shaft of the cylinder drum is placed on the bearing, and one end of the shaft is brought into contact with the contact member. Then, the cylinder drum is rotated by inclining and rotating the rotational force transmission device (eg, belt or rubber roller) with respect to the direction orthogonal to the axial direction of the shaft, and the rotational component of the rotational force causes the shaft to rotate about the rotational center of the shaft. Is pressed against the contact member. In this state, the shake of the cylinder drum is measured by the detection device. As described above, in the shake measuring device for a cylinder drum of the present invention, when setting the cylinder drum, it is not necessary to perform centering as in the shake measuring device for a conventional cylinder drum, so that the setting can be performed easily and quickly. it can.

Further, since the rotational force transmitting device is tilted with respect to the direction perpendicular to the axial direction of the shaft to rotate in contact with the shaft so as to press the shaft against the contact member, the shaft rotates without floating from the contact member. , Rotate without shaking. As a result, stable rotation can be obtained and highly accurate measurement can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cylinder drum shake measuring apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view for explaining the overall configuration of the shake measuring apparatus for a cylinder drum of the present invention, and FIG. 2 is a front view for explaining the overall configuration of the shake measuring apparatus for a cylinder drum of the present invention. Further, FIG. 3 is an explanatory diagram of a shake measuring device for a cylinder drum of the present invention.

As shown in FIG. 1, a shake measuring device 10 for a cylinder drum of the present invention includes a rotating portion 16 for rotating a shaft 14 of the cylinder drum 12, and a cylinder drum 12.
Of the base 2
0 is provided above. First, the structure of the rotating unit 16 is shown in FIG.
Follow the instructions below. The rotating portion 16 is mainly the shaft 1.
The bearing portion 22 for mounting the bearing 4 and the rotational force transmitting portion 24 for applying a rotational force to the shaft 14 mounted on the bearing portion 22. In addition, the bearing portion 16 is the base 20.
The pedestal 26 provided on the pedestal 26, and the pair of bearings 28, 28 and the abutting member 30 provided on the pedestal 26,
The pedestal 26 is installed on the base 20 while being inclined with respect to an arm 34, which will be described later, of the rotational force transmitting portion 24 from an orthogonal state. The bearings 28, 28 provided on the pedestal 26 rotatably mount the shaft 14 as shown in FIG. 3, and are arranged on the pedestal 26 at intervals so that the shaft 14 does not swing during rotation. It Further, the bearings 28, 28 are composed of two spherical bodies 28A, 2
8A, the shaft 14 is supported by point contact, and the spheres 28A, 28A themselves are slidably and rotatably supported by spherical recesses 26A, 26A formed in the pedestal 26. Therefore, when a rotational force is applied to the shaft 14 mounted on the bearings 28, 28, the shaft 14 can perform a smooth rotational movement. Also, the bearing 2
Contact member 30 provided on the same pedestal 26 as 8 and 28
Is a hemispherical piece 31 with a pedestal 26 through a support member 32.
The shaft 14 is fixed on the one end 14A of the shaft 14.
The shaft center (the left end in FIG. 3) comes into contact with the center of the piece 31 and serves as a reference when the shaft 14 rotates. On the other hand, the torque transmission unit 2
2, an arm 34 having a handle 33 attached to one end thereof is swingably supported by a support member 36 provided on the base 20, as shown in FIG. This arm 3
4 of the base end (on the side of the support member 36) and the tip end (handle 3)
Pulleys 38 and 40 are rotatably supported in the vicinity of (3 side). An endless belt 42 is wound around the pulleys 38 and 40 so that the belt 42 contacts the shaft 14 mounted on the bearing 28 when the arm 34 is supported horizontally. Further, a tension roller 44 for adjusting the tension of the belt 42 is installed on the arm 34 in the middle of the traveling path of the belt 42 so that a predetermined tension is always applied to the belt 42. And this belt 42
Is driven by a motor 46 provided in the lower portion of the base 12, that is, the transmission of rotational power to the belt 42 of the motor 46 is performed by the pulley 4 fixed to the rotation shaft of the motor 46.
8 and a pulley 50 fixed to a pulley 38 rotatably supported on the base end of the arm 34, and an endless belt 52 is wound around and transmitted. Further, on the base 20, an arm horizontal support member 54 for supporting the arm 34 in a horizontal state is provided.
Further, an arm standing member 56 that can support the arm 34 in a tilted state (a state where the arm is leaned against) is provided upright, and the arm horizontal support member 54 includes the arm 3
A fixture 58 for horizontally fixing 4 is provided.

The detector 18 for detecting the shake of the cylinder drum 16 has a detector 60 supported by a detector support member 62 mounted on the base 12, as shown in FIG. Then, the stylus 64 of the detector 60 abuts on the side surface of the cylinder drum 16 which is placed on the bearing portion 22 and rotates,
The shake of the cylinder drum 16 is measured. Next, the operation of the cylinder drum shake measuring apparatus 10 configured as described above will be described.

The handle 33 is lifted and the arm 34 is leaned against the arm rest member 56. In the meantime, the shaft 14 is placed on the bearing 28, and the shaft center of the one end 14A of the shaft 14 is brought into contact with the piece 31. Next, the handle 33 is lowered so that the arm 34 is supported horizontally on the arm support member 54 and is fixed by the fixture 58. At this time, the shaft 14 is pressed against the belt 42. If there is a problem with the tension of the belt 42, the tension of the belt 42 is adjusted by the tension roller 44. After the adjustment is completed, the motor 46 is started and the belt 42 is run. Since the shaft 14 is pressed against the belt 42,
When the belt 42 travels, the shaft 14 also rotates on the bearing 28 as the belt 42 travels. Further, since the shaft 14 is inclined with respect to the belt 42, the contact member 30
There is a component force in the direction. This allows the shaft 1
4 is pressed against the piece 31 of the contact member 30,
Stable rotation is performed with 1 as the center of rotation. In this state,
The stylus 64 of the detector 60 is brought into contact with the side surface of the cylinder drum 16 to start the measurement. When the measurement is completed, the detector 6
The zero stylus 64 is separated from the side surface of the cylinder drum 16, and the motor 46 is stopped. Then, the fixture 58 fixing the arm 34 is removed, the handle 33 is lifted, the arm 34 is leaned against the arm leaning member 56, the cylinder drum 12 is removed, and then the cylinder drum 1 to be measured.
Set 2.

Thus, in the shake measuring apparatus for a cylinder drum of the present invention, the shaft 14 of the cylinder drum 12 is placed on the bearing 28, and one end of the shaft 14 is simply brought into contact with the contact member 30. Since 12 can be set, the setting of the cylinder drum 16 can be performed extremely easily as compared with the conventional shake measuring device for a cylinder drum. Further, since the shaft 14 rotates on the basis of the outer circumference, there is no shaft runout that occurs when centering is not accurately performed as in the conventional runout measuring device for a cylinder drum, and stable rotation is obtained with high accuracy. You can measure.

In this embodiment, the shaft 14 is rotated by using the belt 42 as the rotational force transmission portion 24, but the shaft 14 may be rotated by using a rubber roller as shown in FIG. That is, when the shaft 14 is placed on the bearings 28, 28, the rubber roller 62 is rotatably supported at a portion of the arm 34 that intersects with the shaft 14, and the rubber roller 62 is rotatably supported.
A gear 64 is provided at the shaft end of the motor and the rotation of the motor 46 is transmitted by a chain 66.

[0013]

As described above, according to the shake measuring apparatus for a cylinder drum of the present invention, the shaft of the cylinder drum is placed on the bearing and only one end of the shaft is brought into contact with the contact member. Therefore, it is not necessary to perform centering when fixing with a scroll chuck or a shaft center as in the conventional cylinder drum shake measuring device, and setting can be performed in a short time. Further, since the shaft rotates on the basis of the outer circumference, stable rotation can be obtained and stable measurement can be performed without the wobbling of the shaft that occurs when the scroll chuck or the shaft center is not centered accurately.

[Brief description of drawings]

FIG. 1 is a plan view illustrating the overall configuration of a shake measuring device for a cylinder drum.

FIG. 2 is a side view illustrating an overall configuration of a shake measuring device for a cylinder drum.

FIG. 3 is an explanatory view for explaining an embodiment when a belt is used in the rotational force transmission device.

FIG. 4 is an explanatory diagram for explaining an embodiment when a rubber roller is used in the rotational force transmission device.

[Explanation of symbols]

 10 ... Cylinder drum shake measuring device 12 ... Cylinder drum 14 ... Cylinder drum shaft 20 ... Base 26 ... Cradle 28 ... Bearing 30 ... Abutment member 31 ... Piece 34 ... Arm 38, 40, 48, 50 ... Pulley 42, 52 ... Belt 44 ... Tension roller 46 ... Motor 54 ... Arm horizontal support member 56 ... Arm leaning member 60 ... Shake detector

Claims (3)

[Claims] 1. A bearing on which a shaft of a cylinder drum is rotatably mounted, and one end of the shaft mounted thereon is abutted,
While contacting and rotating with the contact member serving as the rotation center point of the shaft in a direction orthogonal to the axial direction of the shaft placed above, the rotation component force presses the shaft against the contact member. It is characterized by comprising a rotational force transmitting device for rotating, a driving means for driving the rotational force transmitting device, and a detecting device for detecting a shake of a drum of a cylinder drum rotating together with the rotating shaft. Cylinder drum shake measurement device. 2. The shake measuring device for a cylinder drum according to claim 1, wherein the rotational force transmitting device is an endless belt that is stretched between a pair of pulleys. 3. The shake measuring device for a cylinder drum according to claim 1, wherein the rotational force transmitting device is a rubber roller.