JPH0628737A - Pinch roller arm control device for tape running device - Google Patents

Abstract

PURPOSE:To form a pinch roller arm control device with one spring and a few position control members only. CONSTITUTION:A torque by a tensile spring 42 is energized to a pinch roller arm 36 supported freely turnably by a slide chassis 4, a pin 41 to be controlled is provided and a stationary chassis 2 is provided with a release arm 46 freely turnably having a cam wall 48 and a cam gear 50 having a cam groove 51 engaged with a pin to be controlled 49 of the release arm. While the slide chassis 4 comes to a position other than a locking position, the pinch roller arm 36 is held to the initial position while being abutted on a projection 45 formed to the slide chassis. When the slide chassis reaches the locking position, the position of the pin to be controlled is restricted by a cam wall of the release arm reaching the release position and the pin is moved to a non-pressing position apart from a capstan 13 and when the release arm is moved to the non- release position from the state, the arm is moved to the pressing position in press contact with the capstan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roller arm control mechanism in a novel tape running device. Specifically, the first chassis provided with the cassette mounting portion and the rotatable pinch roller arm and the second chassis provided with the recording / reproducing portion and the capstan are slidably coupled to each other, and the operation for the tape is as described above. The present invention relates to a pinch roller arm control mechanism in a tape running device that is moved to a retracted position in which a first chassis is relatively retracted so as to substantially overlap with a second chassis. By utilizing the relative movement of the two chassis, the number of springs can be reduced, the structure can be made small and lightweight, and the cost can be reduced. In order to provide a pinch roller arm control mechanism.

[0002]

2. Description of the Related Art The constant speed running of a tape in a tape running device is generally performed by sandwiching the tape in a capstan rotated at a constant speed and pressing a pinch roller against the capstan.
Usually, the pinch roller is rotatably supported on a rotating end portion of a rotatable pinch roller arm so that position control can be performed.

For example, the pinch roller arm in a tape running device such as a video tape player is positioned at least among the following three positions in relation to attachment / detachment of a tape cassette, tape loading, and switching of tape running modes. Controlled.

That is, at least three positions: an initial position located inside the tape cassette, a non-pressing position where the pinch roller is held at a position separated from the capstan to some extent, and a pressing position where the pinch roller is pressed to the capstan. Controlled between.

[0005]

By the way, in the tape running device, there is provided a first chassis having a cassette mounting portion, a pinch roller arm and the like and a second chassis having a recording / reproducing portion and a capstan. There is one in which the chassis is slidably coupled and the operation for the tape is performed in a state where the first chassis is moved to a retracted position in which the first chassis is relatively retracted so as to substantially overlap with the second chassis. In this type of tape running device, it is possible to control the position of the pinch roller arm by the relative movement of the two chassis and the cam provided on the second chassis.

In view of this, the pinch roller arm control mechanism in the tape running device of the present invention solves the above-mentioned problems by providing a controlled portion on the pinch roller arm supported by the first chassis. A pinch roller arm is provided with a spring for urging rotational force, and a second chassis has a cam arm for rotatably supporting a release arm and controlling the position of the release arm. A control means is provided so that the pinch roller arm is held at the initial position by the elastic force of the spring while the first chassis is at a position other than the retracted position, and when the first chassis reaches the retracted position. The controlled portion of the pinch roller arm is in the release position, and the position of the controlled portion is regulated by the cam portion of the release arm, so that the pinch roller arm caps against the elastic force of the spring. When the capstan is moved from the tongue to the non-crimping position and the operation using the capstan starts from that state, the release arm is moved to the non-releasing position, causing the pinch roller arm to spring the spring. It is rotated by force so that the pinch roller is pressed against the capstan.

[0007]

Therefore, in the pinch roller arm control mechanism in the tape running device of the present invention, the pressure of the pinch roller against the capstan and the return of the pinch roller arm to the initial position can be performed by one spring, and Since the position control of the pinch roller arm can be performed only by the release arm and the control means, it is possible to reduce the size and weight of the structure and reduce the cost.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the pinch roller arm control mechanism in the tape running device of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

In the embodiment shown in the drawings, the present invention is applied to a pinch roller arm control mechanism in the video tape player 1.

The video tape player 1 comprises a fixed portion 3 based on a fixed chassis 2 and a movable portion 5 based on a slide chassis 4.

The fixed chassis 2 is slightly larger than the planar shape of the tape cassette 6 used in the video tape player 1 and in the left-right direction (the leftward direction in FIG. 1 is the left side, and the rightward direction is the rightward direction). The right side, the downward direction in the figure is the front side, and the upward direction is the rear side. In the following description, the direction is based on this direction. The main portion 7 and the short guide walls 8 raised from the left and right side edges thereof.
Guide grooves 8a, 8a extending in the front-rear direction are formed in the.

Guide columns 9, 9 having a height about one-third of the thickness of the tape cassette 2 are provided upright on the left and right ends of the front end of the upper surface of the main portion 7.

A head drum 10 supported by a drum base (not shown) is fixed on the upper surface of the main portion 7 at a position near the center rear end thereof, and further fixed to the left side of the head drum 10. A tilt guide 11 is provided upright, a capstan motor 12 is fixed to the right side, and a capstan 13 is projected upward from the capstan motor 12.

The head drum 10 is a fixed chassis 2
Fixed drum 10a fixed to the
The tape cassette is composed of a rotary drum 10b rotatably supported by a plurality of rotary magnetic heads (not shown) located between the fixed drum 10a and the rotary drum 10b and moving along the outer peripheral surface of the head drum 10. When recording or reproducing is performed on the magnetic tape 14 of No. 6, the rotary drum 10b and the rotary magnetic head are integrally rotated at high speed, and the rotation is performed by a drum motor (not shown).

The remaining portion of the fixed portion 3 will be described later.

The slide chassis 4 has a flat plate-shaped main portion 15 having substantially the same size as that of the main portion 7 of the fixed chassis 2, side walls 16 raised from the left and right side edges thereof, and a front surface raised from the front side edges thereof. Guided grooves 18 and 18 extending in the front-rear direction are formed on both left and right sides of the main part 15, and projecting pieces 16a and 16a projecting downward from the lower edges of the rear ends of the side walls 16 and 16. Short guided shafts 19, 19 protruding in the left-right direction are fixed to the.

The guided shafts 19 and 19 are slidable in the guide grooves 8a and 8a formed in the fixed chassis 2.
In addition, the guide columns 9 and 9 provided upright on the fixed chassis 2
The upper ends of the slide chassis 4 are slidably engaged with the guided grooves 18, 18 of the slide chassis 4, respectively, so that the slide chassis 4 is located at a position slightly higher than the fixed chassis 2 in the front-back direction. Is slidably supported.

Incidentally, such a slide chassis 4 has a drawing position in which a substantially rear half portion thereof faces the front half portion of the fixed chassis 2 as shown by a solid line in FIG. 3, and a slide position as shown by a two-dot chain line in FIG. The whole is moved between the fixed chassis 2 and the retracted position facing the fixed chassis 2, and the movement is performed by a moving mechanism (not shown) provided in the fixed chassis 2.

The space 20 inside the slide chassis 4 is a cassette mounting portion, and the tape cassette 6 is removably mounted on the upper surface of the main portion 15 of the slide chassis 4.

The tape cassette 6 is rotatably accommodated in the cassette case 21 with a relatively thin box-shaped cassette case 21 having a substantially rectangular shape elongated in the left-right direction and the magnetic tape 14 having both ends fixed. The supply side tape reel (hereinafter referred to as “S reel”) 22 and the take-up side tape reel (hereinafter referred to as “T reel”) 22 ′, and the tape pull-out concave portion 23 formed in the cassette case 21. The cassette 24 includes a lid 24 for opening and closing the front surface (hereinafter referred to as “tape drawing surface”), and tape outlets 25, 25 are formed at positions near the left and right ends of the front end of the cassette case 21.

The portion of the magnetic tape 14 which is led out from the tape outlets 25, 25 to the outside of the cassette case 21 is positioned so as to extend along the tape pull-out surface before the tape loading. .

A relatively large notch 26 having a substantially U-shape opening rearward is formed in the central portion of the rear side edge of the main portion 15 of the slide chassis 4 and the slide chassis 16 is provided.
When is moved to the retracted position, the head drum 10 is relatively positioned in the notch 26 (see FIG. 2).

Reference numeral 27 is another notch (hereinafter referred to as "pinch roller locating notch") formed on the right side of the notch 26, and the pinch roller locating notch 27 is opened rearward. It is almost V-shaped. A pinch roller, which will be described later, is positioned in the notch 27 for arranging the pinch roller, and the capstan 13 is mounted on the slide chassis 4
Is moved to the retracted position, it is positioned in the pinch roller positioning notch 27.

28 is an S-side reel stand with which the S reel 22 is engaged, and 29 is a T-side reel stand with which the T reel 23 is engaged. These reel stands 28 and 29 are the slide chassis 4.
It is supported by the main portion 15 in a state of protruding upward from the main portion 15.

Reference numeral 30 denotes a movement guide fixed to the slide chassis 4, and the notches 26 and 27 at the rear end of the main portion 15.
It is provided in the position between and.

Reference numerals 31 and 31 'denote tape loading blocks for tape loading. The left tape loading block 31 is composed of a moving base 32, a guide roller 33 and an inclined post 34 which are erected on the moving base 32, and the right tape is provided. The loading block 31 'includes a moving base 32' and a guide roller 33 'installed upright on the moving base 32'. In the state before tape loading is started, these tape loading blocks 31 and 31 'are located on both the left and right sides of the U-shaped notch 26 in the main portion 15 of the slide chassis 4, as shown in FIG. The tape is held in the standby position beside it, and when the tape loading is started, it is moved to a guide member (not shown) provided behind the head drum 10 of the fixed chassis 2 and moved to the loading completion position shown in FIG.

The tape loading is performed after the slide chassis 4 reaches the retracted position.

A pinch roller arm control mechanism 35 controls the position of the pinch roller arm, the pinch roller arm that supports the pinch roller, a tension spring for urging the pinch roller arm to rotate. It includes a release lever and a cam gear.

Reference numeral 36 is a pinch roller arm. The pinch roller arm 36 has a substantially T-shape when viewed from above, and one piece 37 of the pinch roller arm 36 has a main portion 15 of the slide chassis 4.
Is fixed so as to overlap with the other piece 38 of the one piece 37, and a central portion of the one piece 37 that is continuous with the other piece 38 is close to the right side of the front end portion of the notch 27 for locating the pinch roller in the main portion 15. It is supported by a supporting shaft 39 so as to be rotatable in the horizontal direction. The other piece 38 of the pinch roller arm 36 is positioned in the notch 27 for locating the pinch roller with a margin, and a roller support shaft (not shown) is erected at the tip of the other piece 38. The pinch roller 40 is rotatably supported on the roller support shaft. Four
Reference numeral 1 is a small controlled pin vertically provided at the rear end of the one piece 37.

Reference numeral 42 denotes a tension spring, which is arranged in a long hole 43 formed at a position closer to the right end of the main portion 15 of the slide chassis 4, one end of which is a spring formed at a front edge of the long hole 43. It is attached to the hanging portion 44, and the other end is attached to the front end portion of one piece 37 of the pinch roller arm 36.

The pulling force of the tension spring 42 urges the pinch roller arm 36 to rotate in the counterclockwise direction as viewed from above.

A substantially semicircular protrusion 45 is formed in the middle of the left edge of the pinch roller locating notch 27, and when the slide chassis 4 is in a position other than the retracted position, the pinch is struck. The roller arm 36 is held at the initial position where the left edge of the tip of the other piece 38 is in contact with the protrusion 45 (see FIG. 1).

Reference numeral 46 is a release arm supported by the main portion 7 of the fixed chassis 2. The release arm 46 has a dogleg shape that opens substantially rearward to the left when viewed from above, and its bent portion is fixed to the chassis through a support shaft 47 in a state of being positioned to the right front of the capstan motor 12. It is supported by 2 so as to be rotatable in the horizontal direction. And the release arm 4
A short cam wall 48 stands up from the left side edge of the portion extending rearward from the bent portion of 6, and the cam wall 48 is bent at a position from the rear end when viewed from above, and is substantially curved. It is formed to have a V shape, and its upper portion is located at the same height as the lower end portion of the controlled pin 41 provided on the pinch roller arm 36. Reference numeral 49 is a controlled pin that is provided so as to project upward from the tip of a portion that extends from the bent portion of the release arm 46 toward the front left side.

A cam gear 50 controls the position of the release arm 46. The cam gear 50 is rotatably supported by the main portion 7 of the fixed chassis 2, and a cam groove 51 is formed on the lower surface thereof, and the controlled pin 49 of the release arm 46 is slidable in the cam groove 51. Engaged.

The cam groove 51 has two holding portions 51a and 51b extending concentrically with the center of the cam gear 50.
And the holding portions 51a and 51b are connected to each other by the cam gear 5
0 is a very short pressing portion 51c extending in a direction inclined slightly to the radial direction, and one holding portion 51a (hereinafter,
It is referred to as the "first holding unit". The radius of) from the center is the other holding portion 51b (hereinafter referred to as "second holding portion").
It is slightly larger than that, and the clockwise end of the second holding portion 51b and the counterclockwise end of the first holding portion 51a are connected by the pressing portion 51c.

In the initial state, that is, in the state where the slide chassis 4 is in the pulled-out position, the pressing portion 51c of the cam gear 50 is located at the rear left of the center of the cam gear 50, and in this state. The controlled pin 49 of the release arm 46 is located at a position apart from the pressing portion 51c of the first holding portion 51a of the cam groove 51 in the clockwise direction to some extent, whereby the release arm 46 is moved to the position shown in FIG. As shown in the release position, that is, from the bent portion of the cam wall 48, the front guide portion 48a is displaced rearward to the right as it goes rearward,
Further, the holding portion 48b forming the rear end portion of the cam wall 48 is held at the release position in which the holding portion 48b extends substantially in the front-rear direction. In this state, the substantially middle portion of the guide portion 48a faces the controlled pin 41 of the pinch roller arm 36.

The pinch roller arm control mechanism 35 is constructed as described above.

Reference numeral 52 is a flip arm having a flip guide 53 standing upright at one end, and 54 is a ten pin 5 at one end.
5 is a standing leg arm, and the flip arm 52 and the leg arm 54 are horizontally rotatably supported at the left and right ends of the rear end of the main portion 15 of the slide chassis 4, and in the initial state, As shown in FIG. 1, the flip guide 53 is held at the right rear position of the pinch roller 40, and the balance pin 55 is held at the left lateral position of the left tape loading block 31.

The mounting and removal of the tape cassette 6 from the cassette mounting portion 20 are performed with the slide chassis 4 in the pull-out position.

When the tape cassette 6 is mounted in the cassette mounting portion 20, the reel engaging shaft 28 of the reel bases 28 and 29 is mounted.
a and 29a are relatively inserted into the reel base engaging holes 22a and 22'a of the tape reels 22 and 22 ', whereby
The S reel 22 is coupled to the S side reel base 28, and the T reel 22 ′ is coupled to the T side reel base 29 so as to rotate integrally.

When the tape cassette 6 is mounted in the cassette mounting portion 20, the moving guide 30, the guide rollers 33 and 33 ', the inclined post 34, the pinch roller 40,
The flip guide 53 and the balance pin 55 are located inside the magnetic tape 14 located on the front surface of the cassette case 21 (see FIG. 1).

The lid 24 of the tape cassette 6 is moved to a position where the front surface of the tape pull-out recess 23 is opened at least before the slide chassis 4 is moved to the pull-in position.

Therefore, when the slide chassis 4 is moved toward the retracted position from the state where the tape cassette 6 is mounted in the cassette mounting portion 20, the head drum 10 relatively moves the tape pull-out recess 23 of the cassette case 21. A portion of the head drum 10 which is inserted into the head drum 10 and which faces the front side of the outer peripheral surface of the head drum 10, the fixed tilt guide 11, the capstan 1
3, the magnetic tape 14 is wound around the moving guide 30, the guide rollers 33 and 33 '.

Further, during this time, the cam gear 50 is rotated clockwise by a predetermined rotation angle, and at the time when the slide chassis 4 reaches the retracted position, the controlled pin 49 of the release arm 46 is moved as shown in FIG. The first holding portion 51a and the pressing portion 51c of the cam groove 51 of the cam gear 50 are relatively positioned at a position where they are continuous. Therefore, while the slide chassis 4 moves from the pull-out position to the pull-in position, the release arm 46
Are held in the release position.

The controlled pin 41 of the pinch roller arm 36 is first guided by the guide portion 48 of the cam wall 48 of the release arm 46 immediately before the slide chassis 4 reaches the retracted position.
a, thereby being pressed relatively rightward by the guide portion 48a, and then the slide chassis 4 reaches the retracted position at substantially the same time as the holding portion 48 of the cam wall 48.
ride on b.

As a result, the pinch roller arm 36 is rotated in the clockwise direction to some extent against the tensile force of the tension spring 42, so that the pinch roller arm 36 is in the non-contact position shown in FIG.
0 is moved to a position separated from the capstan 13 by a slight distance to the right.

The tape loading is started from the above-mentioned state, and when the tape loading is started, the tape loading blocks 31, 31 'are moved to the loading completion position. The slider arm 52 and the balance arm 54 are rotated rearward at least at the same time when the tape loading is started, whereby the slider guide 53 and the balance pin 55 are attached to the magnetic tape 1.
4 is wrapped.

The above state is the tape loading completion state. In this state, the magnetic tape 14 is passed through the path shown in FIG. 2 and is wound around the outer peripheral surface of the head drum 10 in a spiral shape.

When recording or reproducing on the magnetic tape 14, the cam gear 50 is rotated from this state in the clockwise direction by a predetermined rotation angle. Then, the release arm 46
The controlled pin 49 is positioned in the second holding portion 51b after being pressed by the pressing portion 51c of the cam groove 51 of the cam gear 50. As a result, the release arm 46 is rotated counterclockwise, so that the pinch roller arm 36 is rotated in the same direction by the tensile force of the tension spring 42, and the release arm 4 is released.
The rotation of 6 ends when the pinch roller 40 comes into contact with the capstan 13 and further moves counterclockwise. Therefore, the cam wall 48 of the release arm 46 is separated from the controlled pin 41 of the pinch roller arm 36 (see FIG. 6).

Since the pinch roller 40 is pressed against the capstan 13 by sandwiching the magnetic tape 14, the magnetic tape 14 is run at a constant speed by the rotating capstan 13 and the pinch roller 40.

The magnetic tape 14 is attached to the reel stand 28 or 2
When traveling only by rotating 9 or when performing tape unloading, the cam gear 50 is rotated counterclockwise so that the controlled pin 49 of the release arm 46 causes the first holding portion 51 a of the cam groove 51. Is located in. As a result, the release arm 46 is returned to the release position, so that the controlled pin 41 of the pinch roller arm 36 is moved to the cam wall 48.
It is moved to the non-pressure-bonded position by being pressed by the holding portion 48b of. Then, when tape unloading is performed, the tape loading blocks 31, 31, the flip guide 53, and the tenon pin 55 are returned to their original positions at a predetermined timing.

When the slide chassis 4 moves toward the pull-out position, the head drum 10 relatively moves rearward from the tape pull-out recess 23 of the tape cassette 6, and the pinch roller arm 36 moves. The controlled pin 41 is rotated counterclockwise by the tensile force of the tension spring 42 from the position where the controlled pin 41 is disengaged from the holding portion 48b of the cam wall 48 of the release arm 46, and the other piece 38 is formed on the slide chassis 4. By contacting the protrusion 45, the protrusion 45 is returned to the initial position.

The magnetic tape 14 pulled out from the tape cassette 6 is wound around the tape reel 22 or 22 'by being rotated in the tape winding direction.

The operation of the video tape player 1 is performed as described above.

[0055]

As is apparent from the above description, the pinch roller arm control mechanism in the tape running device of the present invention is the first chassis provided with the cassette mounting portion and the rotatable pinch roller arm and recording. A second chassis provided with a reproducing section and a capstan is slidably coupled to the tape, and the operation for the tape is performed to a retracted position in which the first chassis is relatively retracted so as to substantially overlap with the second chassis. A pinch roller arm control mechanism for a tape running device which is moved, wherein a controlled part is provided on the pinch roller arm and a spring for urging rotational force is provided on the pinch roller arm. A control means for rotatably supporting a release arm having a cam portion and controlling the position of the release arm is provided on the chassis of The pinch roller arm is held at the initial position by the elastic force of the spring while the chassis is in a position other than the retracted position, and when the first chassis reaches the retracted position, the controlled portion of the pinch roller arm is The pinch roller arm is moved to a pressure-bonded position separated from the capstan against the elastic force of the spring by being regulated in position by the cam portion of the release arm that is in the release position, and from that state When the operation using is started, the releasing arm is moved to the non-releasing position so that the pinch roller arm is rotated by the elastic force of the spring and the pinch roller is pressed against the capstan. It is characterized by having done.

Therefore, in the pinch roller arm control mechanism in the tape running device of the present invention, the pressing of the pinch roller to the capstan and the return of the pinch roller arm to the initial position can be performed by one spring, and Since the position control of the pinch roller arm can be performed only by the release arm and the control means, it is possible to reduce the size and weight of the structure and reduce the cost.

The shapes of the pinch roller arm, the release arm, the spring, the control means, and other parts shown in the above embodiments are merely examples of the embodiment for carrying out the present invention. The technical scope of the present invention should not be limitedly interpreted. In particular, the control means for controlling the position of the release arm may be a sliding member using a rack means.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an embodiment in which a pinch roller arm control mechanism in a tape traveling device of the present invention is applied to a pinch roller arm control mechanism in a video tape player, and showing the entire video tape player in an initial state. .

FIG. 2 is an enlarged plan view showing the entire video tape player in a constant speed running mode by cutting a tape cassette.

3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged perspective view showing a pinch roller arm control mechanism.

FIG. 5 is an enlarged plan view showing a main part when the slide chassis reaches the retracted position.

FIG. 6 is an enlarged plan view showing a main part in a constant speed traveling mode.

[Explanation of symbols]

 1 Tape Running Device 2 Second Chassis 4 First Chassis 10 Recording / Reproducing Section 13 Capstan 14 Tape 20 Cassette Mounting Section 35 Pinch Roller Arm Control Mechanism 36 Pinch Roller Arm 41 Controlled Section 42 Spring 45 Contact Section 46 Release Arm 48 cam part 50 control means (cam member, cam gear)

Claims (4)

[Claims] 1. An operation for a tape by slidably coupling a first chassis having a cassette mounting portion and a rotatable pinch roller arm and a second chassis having a recording / reproducing unit and a capstan. Is a pinch roller arm control mechanism in the tape running device, which is performed in a state where the first chassis is moved to the retracted position in which the first chassis is relatively retracted so as to substantially overlap with the second chassis. A control unit is provided, a spring for urging rotational force is provided to the pinch roller arm, a release arm having a cam portion is rotatably supported on the second chassis, and the position of the release arm is set. A control means for controlling is provided, and the pinch roller arm is held at the initial position by the elastic force of the spring while the first chassis is in a position other than the retracted position. Then, when the first chassis reaches the retracted position, the controlled portion of the pinch roller arm is positioned by the cam portion of the release arm that is in the release position, so that the pinch roller arm causes the elastic force of the spring to be exerted. It was moved to the crimped position away from the capstan against
When the operation using the capstan starts from that state, the release arm is moved to the non-release position, whereby the pinch roller arm is rotated by the elastic force of the spring, and the pinch roller is moved to the capstan. A pinch roller arm control mechanism in a tape running device, characterized in that it is crimped onto 2. The pinch roller arm control mechanism in the tape running device according to claim 1, wherein the control means is a cam member. 3. The first chassis is provided with an abutting portion for blocking rotation of the pinch roller arm and holding it at an initial position. Pinch roller arm control mechanism in tape running device. 4. The pinch roller arm control mechanism in the tape running device according to claim 2, wherein the cam member is a cam gear.