JPH01287854A - Tension regulator for tape travelling device - Google Patents

Abstract

PURPOSE:To attain the tension control which is excellent in vibration-proofing and impact resistance, highly accurate and fine by positioning the graving center of a turning arm having the contact part with a tape at a turning edge near the turning shaft. CONSTITUTION:A turning arm 20 to provide a contact part 24 supported freely turnably at a supporting member 2 of a tape travelling device 1 and contacted with a tape 13 at a turning edge, and an elastic means 26 to elastically energize the turning force in the direction, in which the contact part 24 is elastically brought to contact with the tape 13, at the turning arm 20 and the turning arm 20 has a gravity center 21 near a turning shaft 23. Consequently, even when the influence given to the contact part 24 with the action point of the turning arm 20, namely, the tape 13 by a gravity is not changed by the posture of the tape travelling device 1 and oscillation and impact are added to the tape travelling device 1, the gravity to occur due to it does not give the influence to the contact part 24. Thus, the tension control, which is excellent in the vibration proofing and impact resistance, highly accurate and fine, can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The tension regulator of the tape running device of the present invention will be explained according to the following items.

A. Field of use in a business B0 Overview of the invention C1 Prior art [Figures 7 and 8] D9 Problem to be solved by the invention [Figures 7 and 8] E1 Means for solving the problem F , Embodiment [Figs. 1 to 6] F-1, First embodiment [Figs. 1 to 4] a. Overview of 6ft air recording and reproducing apparatus, Tension regulator b-1, configuration - 21 Effect F-2, Second Embodiment [FIGS. 5 and 6] G1 Effects of the Invention (A, Field of Industrial Application) The present invention relates to a tension regulator for a novel tape running device. Specifically, it is a tension regulator that applies tension to the tape running in a tape running device by means of a rotary arm, and although it is low cost, it can perform highly accurate tension control and also eliminate posture differences. The present invention aims to provide a new tension regulator for a tape running device that has almost no difference in performance due to the difference in performance and has improved vibration resistance.

(B. Summary of the Invention) The tension regulator of the tape running device of the present invention locates the center of gravity of the rotating arm, which has a contact portion that comes into contact with the tape at the rotating end, near the rotating axis of the rotating arm. Highly accurate tension control can be achieved by using a device with a small elastic force for the elastic means that urges the elastic force in the direction in which the contact portion contacts the tape. In addition, even if the posture changes, the new rotational moment force generated on the rotating arm becomes smaller, so there is almost no difference in performance due to the difference in posture, and furthermore, when an impact is applied to the rotating arm, The rotational moment generated is small, so it has excellent vibration resistance and impact resistance, and is mechanical, so it has the advantage of being low cost.

(C, Prior Art) [Figures 7 and 8] A magnetic tape running device, such as a video tape recorder or a digital audio recorder, that performs recording and/or playback while the magnetic tape is in contact with a magnetic head. In recording/reproducing devices, it is necessary to control the tension of the magnetic tape in order to maintain good contact between the magnetic head and the magnetic tape.

Therefore, means as shown in FIGS. 7 and 8 are usually adopted.

In the figure, a is a rotary head drum provided on a mechanical chassis (not shown), and has a rotary drum equipped with a magnetic head near its circumferential surface. B and C are reel stands supported by the mechanical chassis, one on the supply side,
On the other hand, C is the winding side. Each reel stand (c) is provided with a brake drum (d, d-) and a reel engaging shaft (e%e').

f and f' are tape reels rotatably housed in a cassette case (not shown), and both ends of the magnetic tape g are fixed to reel hubs (not shown) of each tape reel f%f', and each tape reel f % f'. Then, when the cassette case (not shown) is attached to the magnetic recording/reproducing device, the tape reels f and f' are engaged with the reel engaging shafts e, , a' of the reel stands c, respectively, and the reel stands b% At the same time, the magnetic tape g is pulled out from the cassette case and passed through a predetermined bus, and is wrapped around the rotating head drum a at a predetermined wrapping angle during the bus. It will be done.

The magnetic tape g is pinched between a capstan and a pinch roller (not shown), and is drawn out from the supply tape reel f and fed at a constant speed in the direction of being wound onto the take-up tape reel f'. Then, the rotary drum of the rotary head drum a is rotated at high speed, and the magnetic head supported by it contacts the magnetic tape g and scans it, and during this time recording or reproduction is performed on the magnetic tape g.

Note that h, h, . . . are tape guide members for defining the bus of the magnetic tape g.

Reference numeral 1 designates a rotating arm, one end j of which is rotatably supported by a mechanical chassis, and a ten leg pin L is erected at the rotating end k. During the feeding of the magnetic tape g, the tension spring 0m is designed so that the ten-legged pin 1 comes into contact with the magnetic tape g from the right side in the figure, and is moved slightly closer to the rotating end side than the base end of the rotating arm i. It is stretched between the mechanical chassis and the mechanical chassis, and applies a rotational force to the rotating arm l in the counterclockwise direction in the figure.

n is a band shoe, one end 0 is fixed to the mechanical chassis, and the middle part is the brake drum d of the supply side reel stand.
The other end p is fixed at a position slightly closer to the rotation end than the base end of the rotation arm l.

In the above device, the tension pin 1 provided at the rotating end k of the rotating arm l comes into elastic contact with the magnetic tape g from the right side due to the tensile force of the tension spring m, and as a result, the running magnetic tape Appropriate back tension is given to g. Also, if the back tension of the magnetic tape g suddenly decreases for some reason and the rotating arm l rotates counterclockwise to a greater extent than in normal running conditions, the band shoe n Since the brake drum d of the supply side reel stand is brought into pressure contact and the brake is applied to the reel stand, rapid recovery of back tension is achieved.

(D. Problem to be Solved by the Invention) [Figures 7 and 8] By the way, recent tape running devices include the so-called 8-millimeter tape recorder (a video tape recorder using a magnetic tape with a width of 8111 m) and the R-DAT. As seen in digital audio recorders (digital audio recorders using a rotating head drum), the overall mechanism has become extremely compact and requires highly precise control.

This means that high precision and delicate control is now required for tension control. And, high precision and delicate tension control,
This is possible with a so-called ``electrical type'' tension regulator that converts the swing angle of the rotating arm into an electrical signal to control the tension, but this electric type tension regulator is expensive.

Therefore, in order to perform delicate tape tension control with high precision using a so-called "mechanical" tension regulator that performs tension control by associating an elastic means with the above-mentioned rotating arm, it is necessary to The ratio of the distance from the rotational fulcrum to the tenregibine, that is, the point of action, and the distance from the rotational fulcrum of the rotational arm to the point where the elastic force of the elastic means is applied, that is, the point of force, is made large;
In addition, it is necessary to use a resilient means with a weak spring force.

However, in the above-mentioned conventional tension regulator, the center of gravity of the rotating arm l is located at a position that is significantly different from its rotational fulcrum, so the influence of gravity on the point of action can be significantly affected depending on the attitude of the tape running device. different, also
When vibrations or shocks are applied to the tape running device, the resulting gravity has a large effect on the point of action, so it cannot be used in any posture other than a certain one.
Further, there is a problem that vibration resistance and impact resistance are inferior.

(E. Means for Solving the Problems) Therefore, in order to solve the above problems, the tension regulator of the tape running device of the present invention has a center of gravity of a rotating arm that has a contact portion that contacts the tape at the rotating end. It is located near the axis of rotation.

Therefore, according to the tension regulator of the tape running device of the present invention, the influence of gravity on the point of action of the rotating arm, that is, the contact portion with the tape, does not change much depending on the attitude of the tape running device, and Even when vibration or impact is applied, the resulting gravity has little effect on the point of action.Therefore, the distance from the rotation fulcrum of the rotating arm to the contact point, that is, the point of application, and the rotation of the rotating arm When the distance from the fulcrum to the point where the elastic force of the elastic means reaches, i.e., the point of force, is large, and the elastic means with a weak spring force is used, even if the attitude of the tape running device changes, It has almost no effect on tape tension and has excellent vibration and impact resistance, making it possible to perform delicate tension control with high precision, making tape running devices more compact and more precise. This makes it possible to respond adequately.

(F. Embodiment) [FIGS. 1 to 6] Details of the tension regulator of the tape running device of the present invention will be described below according to the illustrated embodiments. In each of the illustrated embodiments, the present invention is applied to a tension regulator for a magnetic recording/reproducing device equipped with a rotating head drum, such as a video tape recorder or a digital audio recorder.

(F-1, First example of actual performance i!i) [Figures 1 to 4] Figures 1 to 4 show the first embodiment of the tension regulator of the tape running device of the present invention. .

(a. Overview of magnetic recording/reproducing device) 1 is a magnetic recording/reproducing device, and 2 is a mechanical chassis thereof.

3.4 is a reel stand rotatably provided on the mechanical chassis 2, 3 is a supply side reel stand, and 4 is a take-up side reel stand. The reel stands 3.4 each have a reel engagement shaft 5.
．． 5' and a brake drum 6.6'. In addition to this, the reel stand 3.4 is equipped with gears etc. that are not shown.
It is rotated in a predetermined mode, in a predetermined direction, and at a predetermined speed by a reel drive mechanism (not shown).

Reference numeral 7 denotes a rotary head drum mechanism disposed in front of the reel stand 3.4 arrangement section, which includes a fixed drum 8 fixed to the mechanical chassis 2 and a drum drive mechanism (not shown) that is rotatably provided with respect to the fixed drum 8. A rotating drum 9 rotated by a rotating drum 9 and a magnetic head 10, 101 supported by the rotating drum 9 and whose head surface is located approximately in the same plane as the outer peripheral surfaces of the rotating drum 9 and the fixed drum 8 (in addition, only one magnetic head is shown in the drawing). ).

11.12 is a tape reel rotatably housed in a cassette case of a tape cassette (not shown);
1 is a supply tape reel, and 12 is a take-up tape reel.

The tape cassette in which these tape reels 11 and 12 are housed is removably attached to the magnetic recording and reproducing apparatus 1, and when it is attached to the magnetic recording and reproducing apparatus 1, the tape reel 11 is moved to the reel of the reel stand 3. The tape reel 12 is engaged with the engagement shaft 5 and the reel engagement shaft 5' of the reel stand 4, whereby the tape reel 11
．． 12 is adapted to rotate integrally with the reel stand 3.4.

A magnetic tape 13 is wound around the tape reels 11 and 12, and the tape cassette is connected to the magnetic recording/reproducing device 1.
When the magnetic tape 13 is loaded into the tape cassette, it is pulled out from the tape cassette and passed through a tape bus as shown in FIG.
The wire is wrapped around a predetermined wrapping angle.

14.14', 15.15', 16, and t6' are tape guides, which are located at the standby position shown by the two-dot chain line in FIG. 1 until the tape cassette is installed in the magnetic recording/reproducing apparatus 1. . When the tape cassette is loaded into the magnetic recording/reproducing device 1, it moves to the loading completion position shown by the solid line in FIG. do it like this.

17 is a capstan, which is rotated at a constant speed by a capstan drive mechanism (not shown).

Reference numeral 18 denotes a pinch roller that is provided so as to be able to move toward and away from the capstan 17. This pinch roller 18 is pressed onto the capstan 17 with the magnetic tape 13 in between, and when the capstan 17 is rotated in this state, , the magnetic tape 13 is made to run at a constant speed. While the magnetic tape 13 is running in this manner, the rotary drum 9 of the rotary head drum machine 4+917 is rotated, and the magnetic heads 10, 10, . . . Or regeneration is performed.

(b, tension regulator) (b-t, configuration) 19 is a tension regulator provided in the magnetic recording and reproducing device 1, and includes a rotating arm, an elastic means, a band shoe, and a brake drum 6 of the supply side reel stand 3. It consists of

Reference numeral 20 denotes a rotating arm, which has a plate shape that is long in the front-rear direction, and has a center of gravity 21 near the center.

This center of gravity 21 is located approximately in the middle of the rotating arm 20 in the longitudinal direction, and a portion 22 (shown with diagonal lines) rearward from the center of gravity 21 serves as a counterbalance element.

Reference numeral 23 denotes a support shaft erected from the mechanical chassis 2, and is located near the front right side of the supply side reel stand 3. The rotating arm 20 is rotatably supported by the support shaft 23 at or near its center of gravity 21.

Reference numeral 24 denotes a tenge pin erected from the front end of the rotating arm 20, and the tenge pin 24 is connected to the magnetic tape 13.
This is the contact part that comes into contact with the

Reference numeral 25 denotes a spring-loaded pin that is hung from a position slightly forward of the point supported by the support shaft 23 on the rotating arm 20, that is, closer to the tension pin 24 side. Reference numeral 26 denotes a tension spring in the form of a coil spring, one end of which is hooked to the spring hook 25 of the rotating arm 20, and the other end is hooked to the mechanical chassis 2. A rotational force in the clockwise direction is applied, thus
Magnetic tape with Tenregibin 24 passed through a predetermined path as shown above! 3, the tape guides 14 and 15 come into elastic contact from the outside (left side in the drawing).

Reference numeral 27 denotes a band shoe attachment pin that is vertically installed from a position away from the portion of the rotating arm 20 supported by the support shaft 23 on the side opposite to the tension pin 24.

28 is a band shoe, one end 28a of which is fixed to the mounting pin 2f of the rotating arm 20, and the other end 28b fixed to the mechanical chassis 2. And band shoe 28
The intermediate portion 29 of the reel is hooked onto the brake drum 6 of the supply side reel stand 3 and rotated.

Note that 30 is a stopper pin erected from the mechanical chassis 2, and when the magnetic tape 13 is in the non-loading position (this position is indicated by a two-dot chain line in FIG. 1), the rotating arm 20 is The rotating arm 20 is prevented from rotating further in the clockwise direction by contacting the stopper pin 30.

(b-2, Effect) Since the rotating arm 20 is elastically biased by the tension spring 26 to apply a rotating force in the clockwise direction in the figure, the tension arm 24 is rotated against the magnetic tape 13 while it is running. The magnetic tape 13 is elastically contacted from the outside to apply appropriate back tension to the magnetic tape 13. If the tension of the magnetic tape 13 becomes lower than the normal value, the rotating arm 20 will rotate further clockwise from the normal position, and one end 28a of the band shoe 28 will be pulled, causing the middle part of the rotating arm 20 to rotate clockwise. 29 is wound around the brake drum 6 of the supply reel stand 3 with a stronger force, thereby rapidly increasing the back tension of the magnetic tape 13. Conversely, when the tension of the magnetic tape 13 becomes larger than the normal value, the rotating arm 20 is rotated counterclockwise from the normal position, so that one end 28a of the band shoe 28 is loosened, and thereby, band shoe 2
8 reduces the braking force applied to the supply reel stand 3, thereby rapidly reducing the back tension of the magnetic tape 13.

By such an operation, the back tension of the magnetic tape 13 can be suppressed within a substantially constant range.

In the tension regulator 19,
Since the rotating arm 20 is rotatably supported near its center of gravity 21, no extra load is placed on the tension spring 26, and therefore a spring constant with a small spring constant is used to achieve fine precision. You can control the tension. In addition, depending on the posture of the mechanical chassis 2, the influence of gravity on the ten-legged pin 23, and the impact of gravity on the ten-legged pin 23 due to the impact applied to the mechanical chassis 2,
Since the influence on the structure becomes almost negligible, there are no restrictions on the postures in which it can be used, and furthermore, it has excellent vibration resistance and impact resistance.

In the tension regulator 19, the rotary arm 20 is rotatably supported at approximately the middle portion thereof, so that the tension pin 24 is brought into contact with the magnetic tape 13 from the outside of the bus. If the contact is made from the inside of the bus, before the magnetic tape 13 is loaded or when the magnetic tape 13 is unloaded, the tensile pin 24 is positioned inside the magnetic tape 13 in the non-loading position as shown in FIG. As a result, the end of the rotating arm 20 on the side opposite to the tension pin 24 protrudes sideways from the mechanical chassis 20, and as space must be secured for this, the device becomes larger. This is because problems will arise.

(F-2, Second Embodiment) [Figs. 5 and 6] Figs. 5 and 6 show a second embodiment of the tension regulator of the tape running device of the present invention.

Note that this second embodiment differs from the first embodiment only in the rotating arm, so only this different point will be explained in detail, and the rest will be the same as in the first embodiment. The explanation will be omitted by assigning the same reference numerals as those assigned to the parts.

31 is a tension regulator.

Reference numeral 32 designates a rotating arm, and a counterweight 33 is fixed to its rear end, so that its center point 34 is positioned near the rear end.

The rotating arm 32 is rotatably supported by the mechanical chassis 2 by the support shaft 23 near the center of gravity 34 .

In this second tension regulator 31, since the portion rearward from the rotation fulcrum of the rotation arm 32 is short,
It is also possible to bring the ten-legged bin 24 into contact with the magnetic tape 13 from inside its bus.

(G. Effects of the Invention) As is clear from the above description, the tension regulator of the tape running device of the present invention is a tension regulator of the tape running device for applying tension to the running tape in the tape running device. A rotating arm rotatably supported by a support member in a tape running device and having a contact portion that contacts the tape at a rotating end; The rotating arm is characterized in that it has a center of gravity near its rotation axis.

Therefore, according to the tension regulator of the tape running device of the present invention, the influence of gravity on the point of action of the rotating arm, that is, the contact portion with the tape, does not change much depending on the attitude of the tape running device, and Even when vibration or impact is applied, the force generated by it has almost no effect on the point of application.Therefore, the distance from the rotation fulcrum of the rotation arm to the contact point, that is, the point of application, and the rotation of the rotation arm Even if the distance from the dynamic fulcrum to the point at which the crushing force of the projectile means is applied, that is, the point of force, is large, and the spring force is weak, the posture of the tape running device will change. This has almost no effect on the tape tension and has excellent vibration and impact resistance, making it possible to perform delicate tension control with high precision, making tape running devices more compact and more sophisticated. It becomes possible to sufficiently respond to increased precision.

It should be noted that each of the above-mentioned embodiments shows specific application examples of the present invention, and the technical scope of the present invention is not interpreted to be limited thereby.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the tension regulator of a tape running device according to the present invention. FIG. 1 is a schematic plan view of the tape running device to which the present invention is applied, and FIG. Perspective view, Figure 3 is a perspective view of the rotating arm, Figure 4
The figure is a schematic plan view of a comparative example, FIGS. 5 and 6 show a second embodiment of the tension regulator of the tape running device of the present invention, and FIG. 5 is a schematic plan view of the tape running device to which the present invention is applied. A plan view, FIG. 6 is a perspective view of a rotating arm, and FIGS. 7 and 8 show an example of a tape running device to which a tension regulator of a conventional tape running device is applied.
FIG. 7 is a schematic perspective view, and FIG. 8 is a schematic plan view of the main parts. Explanation of symbols 1...Tape traveling device, 2...Supporting member, 13...Tape, 19・φφ
Tension regulator 1 20... Rotating arm, 21... Center of gravity, 23...
・Rotation axis, 24...Contact part, 26...Ejection means, 3! ... Tension regulator, 32... Rotating arm, 34... Center of gravity Person Sony Corporation 20 Rotating arm 23 Rotating shaft 24 /F+ view of contact portion rotation 7-m Fig. 3 32・Rotation 7-tA Rotation arm/'l Comprehensive view (Zf) Rough example) Figure 6

Claims (1)

[Scope of Claim] A tension regulator for a tape running device for applying tension to a running tape, the tension regulator being rotatably supported by a support member in the tape running device and having a tension regulator attached to the tape at a rotating end. The rotating arm includes a rotating arm provided with a contact portion that comes into contact with the tape, and an elastic means that applies a rotating force to the rotating arm in a direction in which the contact portion elastically contacts the tape, and the rotating arm is configured to rotate the rotating arm. A tension regulator for a tape running device characterized by having a center of gravity near the axis.