JPH0230102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a mechanism chassis in a magnetic recording/reproducing apparatus and a magnetic tape running path constructed on the chassis.

The tape running path of a magnetic recording/reproducing device has a particularly large influence on reproduced image quality and compatibility, and its deviation from a theoretical value and stability require precision on the order of microns. Particularly with the recent trend of longer processing times, greater accuracy than ever is required.

A conventional magnetic recording/reproducing device will be explained below. FIG. 1 is a perspective view showing a conventional chassis configuration. The chassis arrangement as a whole consists of two parts: a main chassis 1 and a sub-chassis 7. A supply reel 2, a take-up reel 3, a capstan 4, a flywheel 5, and a pinch roller 6 are installed on the main chassis 1. On the other hand, on the sub-chassis 7 are an entry tape guide 8, an exit tape guide 9, an entry fixing pin 10,
Erase head 11, entrance impedance roller 1
2. Inlet catcher 13, outlet catcher 14,
Output impedance roller 15, A/C head 1
6. The exit side fixing pin 17 is planted. The inlet and outlet tape guides 8 and 9 move along the inlet and outlet grooves 24 and 25 while pulling out a magnetic tape (not shown) from a cassette (not shown), and transfer it to a rotating cylinder (not shown). It is fixed by the inlet and outlet catchers 13 and 14 and the upper surface of the subchassis 7, respectively, so that the magnetic tape can be wound at a predetermined angle. FIG. 2 shows the state of the fixed tape guide. Further, near the inlet and outlet catchers 13 and 14, a cylinder mounting surface 18 is provided as an inclined surface on which the rotary cylinder is mounted. The main chassis 1 and the sub-chassis 7 are connected to each other by screws or the like at three or more positions, as shown by the two-dot chain line in the figure.

The chassis structure as described above has the following disadvantages.

Disadvantages of the structure of the catcher The fixed state of the entrance tape guide 8 is determined by the upper surface of the entrance catcher 13 and the subchassis 7. That is, the position of the entrance tape guide 8 is such that the front protruding part of the tape guide 8 is
The attitude of the tape guide 8 in the left-right direction with respect to the advancing direction during loading (the inclination in the plane perpendicular to the drawing in FIG. 2) is determined by contacting the corresponding recess of the catcher 13.
The shaft portions at the upper and lower ends of the tape guide 8 enter the grooves at the upper and lower ends of the catcher 13, and the posture in the front-rear direction (the inclination in the plane of the drawing in FIG. The upper surface of the recess and the tape guide 8
This is determined by the contact between the upper surface of the tip of the tape guide 8 and the contact between the upper surface of the sub-shaft 7 and the lower surface of the rear end of the tape guide 8 . Therefore, the attitude of the entry tape guide 8, especially the attitude in the longitudinal direction with respect to the entry direction, is determined by two parts, namely, the entry catcher 13 and the sub-chassis 7. As a result, the posture of the entrance tape guide 8 is shifted due to the accuracy of each component and assembly, which deteriorates the running performance of the tape. In particular, the tape guide posture (i.e., tilt angle) in the front and back directions with respect to the above-mentioned approach direction has a large effect on the tension distribution in the width direction of the tape, so if there is a strong tension distribution, the tape ends will deform due to Discrepancies in running height, differences in tape running height between forward and reverse running directions, deterioration of tape head contact, etc. occur, and stable tape running is inhibited. In recent years, due to narrower tracks and thinner tapes due to high-density recording, these unstable runs tend to cause a decline in reliability, such as damage to the reproduced image quality and tape.

Disadvantages in the configuration of the chassis Since the main chassis and sub chassis are separate, the reference planes of the parts planted on each chassis are different, which reduces the relative accuracy of each part that guides the tape travel. difficult to secure. Moreover, when each chassis is fastened with screws or the like, errors in the precision of the mounting surface and deformation of the mounting surface due to the fastening force further deteriorate the relative precision, which impairs the running stability of the tape.

Furthermore, since the chassis has a double structure, it is disadvantageous in making the device thinner and lighter.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording/reproducing apparatus which eliminates the above-mentioned disadvantages of the prior art and enables highly accurate and stable tape running.

In order to achieve the above object, the present invention positions and postures a tape guide using a single member, and this single member is fixed on a chassis on which a rotating cylinder is placed. .

Next, a magnetic recording/reproducing apparatus according to the present invention will be explained with reference to an embodiment shown in the drawings. FIG. 3 is a perspective view of one embodiment. Reference numeral 19 denotes a mechanical chassis that is integrated into one piece, and all traveling system parts are constructed on this mechanical chassis. 2 and 3 indicate the supply and take-up reels, and 4, 5 and 6 indicate the capstan, flywheel and pinch roller.
IN tape guide 20 and OUT tape guide 2
1 slides along the guide grooves A26 and B27 while pulling out the magnetic tape from the cassette,
It is fixed by an IN catcher 22 and an OUT catcher 23. Reference numeral 18 denotes a cylinder mounting surface, on which a rotary cylinder (not shown) is mounted tilted at a predetermined angle. By fixing the tape guides 20 and 21 to the catchers 22 and 23, the magnetic tape leaving the supply reel passes through the input fixing pin 10, the erasing head 11, the input impedance roller 12, the IN tape guide 20, and the rotating magnetic tape. Cylinder (not shown), OUT tape guide 21
furthermore, the exit impedance roller 1
After passing through the A/C head 16 and the output fixing pin 17, it is driven by the capstan 4 and the pinch roller 6, and reaches the take-up reel 3.

The positioning of the tape guide will be explained in detail with reference to FIG.

A wedge-shaped protrusion provided at the tip of the tape guide 20, and a wedge-shaped inclined surface 22 provided on the catcher 22 in correspondence with this protrusion.
The tape guide 20 is positioned in the advancing direction by the abutment surface consisting of the bottom surface 22b and the bottom surface 22b. Positioning in the left-right direction is performed by the shaft portion protruding from the lower surface of the tape guide 20 and the U-groove 22c of the catcher 22. When the tape guide 20 is crimped along the entry direction by pulling the shaft portion protruding toward the lower surface of the tape guide 20, the tip of the tape guide 20 is pushed downward due to the wedge effect of the contact surface. Forced. Furthermore, as the tape guide 20 is biased as described above, the rear lower end of the tape guide 20 is pressed against the support surface 22 of the catcher 20.
It will be pressed by d. Therefore, the supporting surface 22
d determines the attitude of the tape guide 20 in the front-back direction with respect to the advancing direction (that is, the inclination of the tape guide 20 in the plane of the drawing in FIG. 4). Therefore, the position and angular accuracy of the tape guide 20 relative to the mechanical palm 19 can be determined only by the catcher 22, which is a single component.

As described above, according to the present invention, the following effects can be obtained.

Since the position and angular accuracy of the tape guide 20 with respect to the mechanical palm 19 can be determined by the catcher 22 alone, it is easy to ensure the accuracy of the tape guide 20 with respect to the rotating cylinder. Therefore, stable running of the tape is ensured,
Good image quality and high reliability can be obtained.

Since the tape running system can be configured with a single chassis without using a plurality of chassis as in the conventional case, relative precision between each tape guide can be ensured. Therefore, it is possible to stabilize the tape running and to make the device thinner and lighter.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional traveling system mechanism;
FIG. 2 is a cross-sectional view of a conventional tape guide and catcher, FIG. 3 is a perspective view of an embodiment of the chassis of the magnetic recording/reproducing apparatus of the present invention, and FIG. 4 is a cross-sectional view of a conventional tape guide and catcher. FIG. 1...Main chassis, 2...Supply reel, 3...Take-up reel, 4...Capstan, 6...Pinch roller, 7...Sub chassis.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device that records and reproduces data by spirally winding a magnetic tape at a predetermined angle around a rotating cylinder equipped with a magnetic head, the magnetic tape is wound around the rotating cylinder on a substrate on which the rotating cylinder is directly mounted. A fixing means is provided that comes into contact with the guide member to be mounted, and the fixing means has an abutting surface that comes into close contact with the front surface of the guide member that has been moved and stops the guide member from moving, and a rear lower surface of the stopped guide member. 1. A magnetic recording and reproducing device comprising a single member having a supporting surface and a supporting surface that determines the inclination of the guide member together with the abutting surface.