JPH07182634A - Rotary deflecting inspection for cylinder head for magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To make possible the inspecting of a rotary deflection range of an upper cylinder precisely with a sensor for detecting deflection by rotating the upper cylinder with a drive layer. CONSTITUTION:When a rotary actuator 20 of a power transmission device 6 is drive, a rotary member 21 is turned to make a power transmission belt 23 abut the side of a ring 1c, causing a drive motor 24 to be driven. As a result, the power transmission belt 23 runs through pulleys 22 and 22 to rotate the ring 1c and an upper cylinder 1a at a high speed. The rotary driving power of the drive motor 24 is not directly to the upper cylinder 1a. But it is transmitted indirectly through the power transmission belt 23 and the vibration of the drive motor 24 is absorbed with an elastic deformation of the power transmission belt 23 to be kept from transmitting to the upper cylinder 1a. This makes possible the inspecting of the rotary deflection range of the upper cylinder 1a precisely with a sensor 4 for inspecting oscillation.

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a rotational shake inspection device for inspecting the rotational shake width of the upper cylinder of a cylinder head for a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art In a helical scan method in a magnetic recording / reproducing apparatus, a magnetic tape is wound around an obliquely arranged cylinder head in an Ω shape, the magnetic tape is run at a low speed, and the upper cylinder of the cylinder head is magnetically moved. By rotating at high speed in the running direction of the tape,
In addition, a video head integrated with the cylinder runs diagonally on the surface of the magnetic tape, thereby forming a video track diagonally on the surface of the magnetic tape. When the rotational shake is large, the formation of the video track becomes unstable, and magnetic recording and reproduction cannot be accurately performed. Therefore, it is necessary to inspect by the rotation shake inspection device whether or not the rotation shake of the upper cylinder is within a certain allowable range.

A conventional rotational shake inspection device is provided with a clamp device for clamping the lower cylinder of the cylinder head and a shake detection sensor which is close to the side surface of the upper cylinder. The upper cylinder is manually rotated in the clamped state, and the rotational shake width of the upper cylinder is inspected by the shake detecting sensor.

[0004]

SUMMARY OF THE INVENTION In the above conventional configuration,
Since the upper cylinder is manually rotated, it is difficult to put the upper cylinder into a rotating state as when magnetic recording and reproducing, and the upper cylinder is liable to rotate due to the impact of contact with a finger, It was difficult to inspect the swing range precisely.

In view of the above problems, the present invention rotates a cylinder head for a magnetic recording / reproducing apparatus by rotating the upper cylinder in a state in which vibration is not transmitted from the outside so that the rotational fluctuation range can be precisely inspected. It is intended to provide a shake inspection device.

[0006]

To achieve the above object, the present invention relates to rotation of the upper cylinder of a cylinder head for a magnetic recording / reproducing apparatus, which comprises an upper cylinder, a lower cylinder and a ring integrally connected to the upper cylinder. A rotation shake inspection device for inspecting shake, wherein a machine frame on which the lower cylinder is mounted, a cylinder support frame that abuts a side surface of the lower cylinder, and a shake detection sensor that is close to a side surface of the upper cylinder. And a clamp lever for clamping the lower cylinder with the cylinder support frame is arranged rotatably and movably on the machine frame by pressing the tip end against the side surface of the lower cylinder, and faces the ring. And a pair of pulleys that are arranged to face each other at a predetermined interval on a rotating member that is rotatably driven on the machine frame and is wound between both pulleys. In addition, a power transmission belt that abuts the side surface of the ring by bringing the rotating member close to the ring, and a drive device that runs the power transmission belt via the pulley are provided. .

[0007]

In the above structure, when inspecting the rotational run-out width of the upper cylinder, the lower cylinder of the cylinder head is placed on the machine frame, brought into contact with the support frame, and the clamp lever is rotationally driven. After clamping the lower cylinder with the tip of the clamp lever and the cylinder support frame,
It suffices to drive the rotating member so as to bring the power transmission belt into contact with the ring and drive the drive device. by this,
The power transmission belt runs to rotate the ring, and the upper cylinder integrated with the ring can be rotated at high speed in the almost same state as during magnetic recording and reproduction, and the vibration of the drive device is absorbed by the elastic deformation of the power transmission belt. Because
Rotational runout of the upper cylinder can be precisely inspected by a runout inspection sensor.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a rotational shake inspection apparatus according to an embodiment of the present invention, which is a magnetic recording / reproducing apparatus including an upper cylinder 1a, a lower cylinder 1b, and a ring 1c integrally connected to the upper cylinder 1a. Frame 2 for mounting the cylinder head 1 for the cylinder, and a cylinder support frame 3 for abutting the side surface of the lower cylinder 1b of the cylinder head 1.
And a shake inspection sensor 4 close to the side surface of the upper cylinder 1a, a clamp device 5 for clamping the lower cylinder 1b, and a power transmission device 6 for transmitting power to the upper cylinder 1a.

As shown in FIG. 3, the machine casing 2 includes a ring 1
Base 9 having a notched concave portion 8 for passing c
And a support base 10 which is fixed to the base 9 so as to surround the cutout recess 8 and has a substantially U-shape in plan view. The lower cylinder 1b is mounted on the support base 10. Has become.

The cylinder support frame 3 is fixed to the front end of the support base 10, and the side surfaces of the lower cylinder 1b are brought into contact with the side surfaces 12a, 12a of the V-shaped groove 12 formed on the side surface of the support base 10, whereby the cylinder head is closed. 1 can be positioned in place.

The shake inspection sensor 4 is attached to the movable frame 14a of the fine adjustment device 14 disposed on the cylinder support frame 3 so that the side surface of the upper cylinder 1a placed on the cylinder support frame 3 is about 60 μm. The various sensors such as capacitance type are used as this sensor. For example, in the capacitance type sensor, based on the voltage change corresponding to the change of the gap α, Thus, the rotational shake width of the upper cylinder 1a can be detected. Further, the gap α can be finely adjusted by rotating the adjustment knob 14b of the fine adjustment device 14 in the forward and reverse directions. In addition, 15 is a shake inspection sensor 4
It is an electric cord connected to.

The clamp device 5 comprises an air type rotary actuator 17 attached to the lower surface of the base 9, and a clamp lever 18 which is reciprocally rotated by the rotary actuator 17, and the rotary actuator is changed from the state shown by the phantom line in FIG. By driving 17 to rotate the clamp lever 18, as shown by the solid line in the figure,
Attach the tip 18a of the clamp lever 18 to the lower cylinder 1
The lower cylinder 1b can be clamped with the cylinder support frame 3 by being pressed against the side surface of b.

The power transmission device 6 includes an air type rotary actuator 20 mounted on the upper surface of the base 10, and a rotating member 21 opposed to the ring 1c and having a base end fixed to a drive shaft of the rotary actuator 20. The rotating member 21 is wound around between the pair of pulleys 22 and 22, which are opposed to each other at a predetermined interval, and the rotating member 21 and the ring 1c. 1 is provided with a power transmission belt 23 that comes into contact with the side surface of the ring 1c and a drive motor (driving device) 24 that runs the power transmission belt 23 via one pulley 22. By driving the rotary actuator 20 to rotate the rotating member 21 from the state shown by the phantom line, as shown by the solid line in FIG.
3 is brought into contact with the side surface of the ring 1c, and in this contact state, the drive motor 24 is driven to drive the pulleys 22, 22
The power transmission belt 23 is run through the ring 1c.
Also, the upper cylinder 1a can be rotated at high speed.
In this embodiment, the rotary actuator 17 for rotating the clamp lever 18, the rotary actuator 20 for rotating the rotating member 21, and the drive motor 24 for rotating the pulley 22 are controlled by a sequencer (not shown). It operates in the order shown below.

In the above structure, when inspecting the rotational run-out width of the upper cylinder 1a, the lower cylinder 1b of the cylinder head 1 is supported by the support base 1 in the state of the phantom line in FIG.
Then, the rotary actuator 17 of the clamp device 5 is driven by placing the cylinder support frame 0 on the cylinder support frame 3 and bringing it into contact with the cylinder support frame 3.
As a result, the clamp lever 18 is rotated, and as shown by the solid line in FIG. 1, the tip end portion 18a of the clamp lever 18 is brought into pressure contact with the side surface of the lower cylinder 1b, and the clamp lever 18 and the cylinder support frame 3 form a lower cylinder. 1b can be clamped. In this case, lower cylinder 1b
Both side surfaces 12a, 1 of the clamp lever 18 and the V-shaped groove 12
The cylinder head 1 can be reliably positioned at a predetermined position because it is sandwiched with the 2a from three directions, and the side surface of the upper cylinder 1a can be brought close to the shake inspection sensor 4 with a predetermined gap α. it can.

Next, by driving the rotary actuator 20 of the power transmission device 6, the rotary member 21 is rotated to bring the power transmission belt 23 into contact with the side surface of the ring 1c and drive the drive motor 24. . As a result, the power transmission belt 23 runs through the pulleys 22 and 22, and the ring 1c and the upper cylinder 1a can be rotated at high speed. Further, the rotational driving force of the drive motor 24 is not directly transmitted to the upper cylinder 1a, and the power transmission belt 23
Since the vibration of the drive motor 24 is not transmitted to the upper cylinder 1a due to the elastic deformation of the power transmission belt 23, the vibration of the driving motor 24 is not transmitted to the upper cylinder 1a. Can be inspected.

In the above embodiment, the shake inspection sensor 4 is provided above the V-shaped groove 12, but other than this position, for example, as shown by the phantom line in FIG. You may provide in a position.

[0017]

According to the present invention, since the upper cylinder is rotated by the driving device, the upper cylinder can be rotated at a high speed in substantially the same state as during magnetic recording and reproduction, and the driving device can be rotated. The rotational driving force of is transmitted to the upper cylinder via the power transmission belt, and the vibration of the drive device is absorbed by the elastic deformation of the power transmission belt, so that the vibration is not transmitted to the upper cylinder, With the shake inspection sensor, the rotation shake width of the upper cylinder can be inspected precisely.

[Brief description of drawings]

FIG. 1 is a plan view of a rotation shake inspection apparatus that is an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a perspective view of the same.

[Explanation of symbols]

 1 Cylinder Head 1a Upper Cylinder 1b Lower Cylinder 1c Ring 2 Machine Frame 3 Cylinder Support Frame 4 Shake Inspection Sensor 18 Clamp Lever 21 Rotating Member 22 Pulley 23 Power Transmission Belt 24 Drive Motor (Drive Device)

Claims (1)

[Claims] 1. A rotation shake inspection device for inspecting the rotation shake of the upper cylinder of a cylinder head for a magnetic recording / reproducing apparatus, which comprises an upper cylinder, a lower cylinder, and a ring integrally connected to the upper cylinder. The machine frame on which the lower cylinder is mounted is provided with a cylinder support frame that abuts the side surface of the lower cylinder, and a shake detection sensor that is close to the side surface of the upper cylinder, and the tip end is in pressure contact with the side surface of the lower cylinder. As a result, a clamp lever that clamps the lower cylinder with the cylinder support frame is rotatably arranged on the machine frame, and is rotatably arranged on the machine frame so as to face the ring. By a pair of pulleys, which are arranged facing each other at a predetermined interval to the member, and wound between the pulleys, and the rotating member is brought close to the ring, A rotation shake inspection apparatus for a cylinder head for a magnetic recording / reproducing apparatus, comprising: a power transmission belt that abuts a side surface of the ring; and a drive device that drives the power transmission belt via the pulley.