JPH01137453A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To arrange an adjusting mechanism part irrespective of a tension band winding and pulling out directions and to miniaturize the whole mechanism by providing a band supporting member capable of pulling out optionally a tension band on the adjusting mechanism part. CONSTITUTION:A fixed pin 30, as the supporting member by which a tension band 19 is locked so as to have the specified angle for the part where the tension band 19 fed from a brake drum is pulled out of a tension band fitting member 27, is provided on an adjusting mechanism part 25. The tension band 19 pulled out of the adjusting mechanism part is therefore wound on the brake drum after being bent at the specified angle by being wound on the supporting member. Any limitation is thus eliminated on the arrangement of the adjusting mechanism part 25, the diameter of the brake drum can be reduced and a tape tension control mechanism can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing apparatus equipped with a mechanism for optimizing the tensicon during running of a tape-shaped magnetic recording medium.

[Prior Art] FIG. 7 is a plan view showing a running system of a conventional magnetic recording/reproducing device.

The cassette l is equipped with a supply reel 3 and a take-up reel 4 for feeding a tape-shaped magnetic recording medium 2 (hereinafter referred to as magnetic tape), and a recess 6 is formed on one side facing the head drum 5 for one rotation. These four parts 6 and the rotating head drum 5 are connected to a tension post 7 for setting the magnetic tape 2 in a predetermined running state during tape loading, an impedance roller 8, a rotating roller 9, fixed bins 10, 11, a rotating roller 12, and Rotating rollers 13 are provided.Among them, fixed bin lO and fixed bin 11
are fixed on the chassis, and the tension post 7, impedance roller 81, rotating roller 99, rotating roller 12, and rotating roller 13 are arranged horizontally in the recess 6 when the cassette L is installed, and are moved when loading the tape, as shown in FIG. It is positioned as follows.

A capstan 14 and a pinch roller 15 are disposed between the tape running paths of the rotating rollers 12 and 13 to transport the magnetic tape 2 at a constant speed. The pinch roller 15 moves integrally with moving members such as the tension post 7 from within the recess 6 to the position shown in FIG. 7 during tape loading.

A tape tension control mechanism configured as shown in FIG. 8 is provided near the supply reel 3, and applies a constant tape tension to the magnetic tape 2 pulled out from the supply reel 3. The tape tension control mechanism is connected to shaft 16. A tension arm 17 rotatably supported on a shaft 16 and having a tension post 7 attached to its end. Spring 1B that biases tension arm 17 counterclockwise, supply side reel 3
The tension band 19 is attached to a predetermined portion of a brake drum (not shown) via felt or the like so as to be in contact therewith, and the adjustment mechanism section 20 is attached to the end of the tension band 19.

The 3I adjustment mechanism section 20 includes a tension band attachment member 21. which solidifies the end of the tension band 19 so as to be slidable in the direction of the pitcher's force. A screw 22 and a tension arm 17 for sliding the tension band attachment member 21 to a desired position.
It is composed of a compression spring 23 that urges the screw 22 toward the screw 22, and a housing 24 in which these are built in or attached.

In the above configuration, when the cassette l is loaded and tape loading is started, each bin is loaded.

Each roller and capstan 14 move while pulling out the magnetic tape 2 from the cassette 1, and are positioned in the state shown in FIG. When the magnetic tape 2 is conveyed, the adjustment mechanism section 20 is activated and contacts the brake drum of the supply reel 3 with a predetermined contact pressure, thereby preventing the supply reel 3 from rotating at a speed higher than the tape withdrawal speed.

In this case, the degree of contact between the brake drum and the tension band 19 can be adjusted by changing the amount of greening of the screw 22, that is, the amount of movement of the tension band mounting member 21, and moving the tension band 19 in the radial direction of the brake drum. . After the adjustment is completed, the screw 22 is coated with adhesive or the like to prevent misalignment.

This type of adjustment mechanism section 20 does not correct back torque due to changes in the tape winding diameter of the supply reel 3.
Therefore, in reality, the tape tension is greater at the end of tape winding than at the beginning of tape winding. As shown in FIGS. 9 and 10, this tension ratio is related to the diameter of the brake drum and the wrapping angle of the tension band 19, and the larger the value of either of them, the smaller the tension ratio can be.

[Problems to be Solved by the Invention] In the conventional magnetic recording/reproducing device as described above, it is necessary to rotate the screw when adjusting the tension, and it is necessary to face the direction in which the adjustment screwdriver is inserted, which makes it difficult to design the mechanism. There is a problem that there are restrictions and that the wrapping angle of the tensicon band cannot be made large. Furthermore, in order to keep the tension ratio between the beginning and the end of tape winding low, the diameter of the brake drum must be increased, which necessitates an increase in the size of the mechanism.

[Means for Solving the Problems] In order to achieve the above object, the present invention applies a certain biasing force to one end of a tension band wound around a predetermined range of a brake drum attached to a cassette reel. and a tape tension control mechanism that adjusts the contact pressure between the brake drum and the tension band by attaching an adjustment mechanism to the other end and moving the arrangement position of the tension band attachment member of the adjustment mechanism. In the magnetic recording/reproducing device, a support member to which the tension band is locked is attached to the adjustment mechanism section so that the tension band from the brake drum has a predetermined angle with respect to a portion pulled out from the tension band mounting member. It was established.

[Function] With the above configuration, the tension band pulled out from the adjustment mechanism section 211 is wrapped around the support member, bent at a predetermined angle, and then wrapped around the brake drum, so that the tension band pulled out from the adjustment mechanism section 211 is wrapped around the brake drum. There are no restrictions on the arrangement, the diameter of the brake drum can be reduced, and the tape tension control U4 mechanism can be downsized.

[Embodiment] FIG. 1 is a plan view showing the main configuration of an embodiment of the present invention.
FIG. 2 is a perspective view showing details of the adjustment mechanism shown in FIG. 1;
3 to 5 are a front view, a side view, and a plan view showing details of the adjustment mechanism shown in FIG. 2. FIG. Further, the same reference numerals as in FIG. 7 indicate the same or corresponding parts.

As shown in FIG. 1, an adjustment mechanism section 25 is attached to the end of the tension band 19, and as shown in FIG. 2, it has an opening on one side and walls on the other five sides. housing 2
6. A tension band attachment member 27 whose protrusion is fitted into a long groove 31 provided in the longitudinal direction of the upper surface to freely slide in the longitudinal direction within the housing 26 and to which the tension band 19 is attached to the exposed surface. A compression spring 28 that engages with a female thread provided on the side of the housing 26, is rotatably coupled to the tension band attachment member 27, and moves the tension band attachment member 27 according to the amount of screwing. An adjustment screw 2 disposed within the housing 26 and urging the tension band attachment member 27 toward the compression spring 28.
9. The fixing pin 30 is arranged adjacent to the adjustment screw 29 and serves as a support member for securing the tension band 19 pulled out from the tension band attachment member 27.

In the above configuration, the contact pressure of the tension band 19 against the brake drum can be adjusted by increasing or decreasing the screwing amount of the compression spring 28, as in the conventional example shown in FIG. By moving the magnetic tape 2 in either direction, tension can be applied to the magnetic tape 2 according to the amount of movement. As the tension band attachment member 27 moves to the left in FIG. 2, the tension becomes stronger, and conversely, as the tension band attachment member 27 moves to the right, the tension becomes weaker. The tension band attachment member 27 is always biased by the adjustment screw 29 in a direction to extend the tension band 19, and even if the tension of the tension band 19 changes, it is immediately returned to the adjusted value.

The adjustment mechanism section 25 is arranged such that the compression spring 28 faces a position where an adjustment driver can be inserted from the gap between the cassette and the chassis. Tension band 19 is fixed pin 30
The tension is 19 because it is wound around the
The drawing direction (drawing angle) with respect to the rotating head drum 5 can be freely selected. Therefore, the angle at which the tension band 19 is wound around the brake drum can also be made large as shown in FIG. This means that the diameter of the brake drum can be reduced, and the tape tension side control mechanism can be further downsized. On the other hand, since the direction of adjustment using an adjustment tool such as a screwdriver can be freely selected, the installation space can be secured without imposing restrictions on other mechanisms.

FIG. 6 is a perspective view showing another embodiment of the invention. This embodiment differs from the previous embodiment in that the fixing pin 30
In this case, a protruding piece is provided in advance on the housing 26, and the supporting part 32 is formed by bending the protruding piece at right angles. With such a configuration, the number of parts can be reduced, contributing to cost reduction.

[Effect of the invention] As explained above, this invention achieves 3I! ! Since the mechanism section is provided with a band support member that allows the tension band to be pulled out arbitrarily, the adjustment mechanism section can be disposed regardless of the direction in which the tension band is wound and pulled out. In addition, since the wrapping angle around the brake drum can be increased, a predetermined tension can be applied without increasing the diameter of the brake drum. This makes it possible to downsize the entire structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main structure of an embodiment of the present invention;
Fig. 2 is a perspective view showing details of the rAffi mechanism shown in Fig. 1, Figs. 3 to 5 are front views, side views, and plan views showing details of the adjustment mechanism shown in Fig. 2, and Fig. 6. 7 is a perspective view showing the main structure of another embodiment of the present invention, FIG. 7 is a plan view showing a running system of a conventional magnetic recording and reproducing device, and FIG. 8 is a tape used in the magnetic recording and reproducing device of FIG. FIG. 9 is a plan view showing the tension control mechanism, FIG. 9 is a tension ratio characteristic diagram with respect to the brake drum diameter, and FIG. 1θ is a tension ratio characteristic diagram with respect to the tension band wrapping angle. In the figure. l: Cassette 2: Magnetic tape 17: Tension arm 18 Spring 19: Tension band
25: Adjustment mechanism section 26: Housing 27: Tension band attachment member 28: Compression spring 29: Adjustment screw 30: Fixing pin 32: Supporting section agent Patent attorney 1) Haru Kitatake Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8

Claims (1)

[Claims] A certain biasing force is applied to one end of the tension band wound around a predetermined range of the brake drum attached to the reel of the cassette, and an adjustment mechanism is attached to the other end, and the tension band mounting member of the adjustment mechanism is attached to the other end. In a magnetic recording/reproducing device equipped with a tape tension control mechanism that adjusts the contact pressure between the brake drum and the tension band by moving the arrangement position, the tension band from the brake drum is removed from the tension band mounting member. A magnetic recording/reproducing device characterized in that the adjustment mechanism section is provided with a support member to which the tension band is locked at a predetermined angle with respect to the drawer portion.