JPS59218657A - Recording or playback device - Google Patents

Abstract

PURPOSE:To decide freely a shift route with a simple constitution and at the same time to decrease the number of component parts which are stored in a cassette opening part, by making use of the revolution of an arm holding a pinch roller to the decision of the shift route of the pinch roller as well as to the press contact of the pinch roller to a capstan. CONSTITUTION:When a rotary ring 36 is revolved to laod a tape, a holder plate 24 moves toward D via a drive gear 37 and the rack part of a mobile plate 32. A projection part 23b of a pinch roller arm 23 touches a cam member 39 and moves. A pinch roller 21 draws a proper locus and moves together with a guide post 22 to be set at a place near a capstan shaft 20. An iron core 41 is energized by a solenoid 40 with a tape drive instruction and presses a projection part 23a. Thus the arm 23 is turned and the roller 21 is pressed to the capstan 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a recording or reproducing device, and more particularly to a device that pulls out a tape from a cassette and runs it for recording or reproducing.

<Description of the Prior Art> Two methods for running a tape at a constant speed for recording or playback in this type of device include a method in which a capstan is placed inside the cassette and a pinch roller is pressed against it from the outside of the cassette; There was a method of moving the pinch roller located inside the cassette and pressing it against the capstan located outside the cassette.

For example, in a device for recording and reproducing video signals (hereinafter referred to as a VTR), there are two methods for running the tape at a constant speed, such as pulling a magnetic tape out of a cassette and wrapping it around a cylinder equipped with a rotating magnetic head. Ta. However, according to the former method, the path of the tape drawn out tends to be at an acute angle, causing the tape to wind around the pinch roller.

On the other hand, according to the latter method, it is difficult to provide a path for moving the pinch roller due to constraints such as the shape of the opening of the cassette, the relationship of r'A1 with the movement of other mechanical parts, and the miniaturization of the apparatus. In other words, simply moving the pinch roller in conjunction with an arcuate or linear drive mechanism would affect the position of the cassette opening.

The position of the tape path, the position of other mechanical parts, and even the movement of other mechanical parts are all restricted by the movement path of the pinch roller, which hinders the miniaturization of the device. It is. However, if the movement path of the drive mechanism for moving the pinch roller is made to be complicated, this drive mechanism will become larger.

Furthermore, according to the latter method, members for pulling out the tape, pinch rollers, etc. must all be stored in a limited space within the cassette opening during the unloading state. Therefore, the structure becomes very complicated. In particular, when tape damage is taken into account, the pull-out member must function as a rotating guide post, and therefore must be provided with a large number of movable rotating shafts. In addition, the pinch roller must be moved to a position close to the capstan and then brought into pressure contact with the capstan, and if the mechanism for this purpose were to be housed in the aforementioned limited space, the number of parts would increase, and many precision parts would have to be used. Must be.

<Object of the Invention> In view of the above-mentioned drawbacks, the present invention provides a recording or reproducing device that has a simple configuration, can freely determine the movement path of the pinch roller, and can reduce the number of parts housed in the cassette opening. The purpose is to

<Explanation of Examples> The present invention will be explained below using examples.

FIG. 1 is a diagram showing a tape running system of a VTR as an embodiment of the present invention. 3 is a cassette, 2 is an opening of the cassette 1, and 3 and 4 are fixed guide posts installed in the cassette 1, respectively.

Reference numerals 5 and 6 indicate preload rotation guide posts, and by moving them from the positions inside the opening 2 (indicated by 5' and 6' in the figure) to the outside of the cassette as shown in the figure, the tape path is set as shown by the dashed line 7. is set, and the tape is not loaded in the cylinder 18 but pulled out of the cassette (hereinafter referred to as a preloaded state).

8 is a tension pin, which moves in the direction of arrow 8' according to the tension of the tape. In response to this movement, for example, the tension of a band brake wound around the take-up reel is adjusted to keep the tape tension constant.

9 is a trailing loading base, and a guide post 10, 12 and an inclined post 11 are installed on the base 9. Reference numeral 13 denotes a preliminary loading base, on which a guide post 14 and a preliminary post 15 are erected.

Reference numeral 16 indicates an inlet side regulating post, and 17 indicates an outlet side regulating post.These two regulating posts 16 and 17 regulate the corners of the tape wrapped around the cylinder 18 and the height in the width direction of the tape. 19 is a guide post, 20 is a capstan shaft, and the capstan shaft 20 and the pinch roller 2
1, hold the tape and run it. 22 is a moving guide post; 23 is a pinch roller arm that supports the pinch roller 21 and the moving guide post 22 at both ends; the arm 23 is rotatable around the axis of the moving guide post 22; can be attached to and detached from the capstan shaft 20.

The tape path and the positions of each drawing member and loading member in the unloaded state are shown by broken lines. From this state, first, the supply side preload post 5 and the take-up side preload post 6 pull out the tape, forming a tape path as shown by the dashed line 7, and bringing the tape into the preload state. In the fast forward and one rewind mode, the tape is placed in this preloaded state.

Thereafter, the leading base 13 and the trailing base 9 move to wrap the tape around the cylinder 18 from the supply side, and the moving guide post 22 pulls out the tape from the winding side and stops at a predetermined position as shown by the solid line in the figure. do. At this time, the pinch roller 21 also moves together with the movable guide post 22 and is placed near the capstan shaft 20. Loading is now complete, and the pinch roller 21 is moved to the capstan 2 by the pinch roller pressure bonding mechanism (not shown).
0 and the tape starts running.

FIG. 2 is a side view showing a pinch roller holding structure according to the present invention, and FIG. 3 is a view of the holding structure shown in FIG. 2 viewed from below. 24 is a holding plate, and a guide post shaft 25 is installed in the center thereof. With the post shaft 25 as the center, the flange 9281 rotating roller 27. A lower flange 28' is attached and constitutes a guide post 22. Further, one end of the aforementioned pinch roller arm 23 is rotatably fitted to the lower part of the guide post shaft 25, and the arm 23 is prevented from being pulled out in the thrust direction by a retaining ring 26. A pinch roller shaft 29 is installed at the other end of the pinch roller arm 23, and the pinch roller 21 is rotatably fitted onto this shaft 29. 30
is a torsion spring, one end of which is connected to the pinch roller arm 2.
The spring 30 is locked by a protrusion 23 a protruding from the bottom of the pinch roller arm 2 , and the other end is locked by a positioning pin 31 set up on the holding plate 24 .
3 is given an old force to rotate counterclockwise as shown by arrow 23/ in FIG.

Reference numeral 32 denotes a movable plate, which is slidably supported by shafts 33 and 34 set on the back surface of the holding plate 24. Also, retaining plate 2
A spring 35 is hung between the bent portion 24a of the moving plate 32 and the bent portion 32a of the moving plate 32, so that the moving plate 32
4 in the direction shown by arrow A in FIG. Further, a rack portion 32b is provided on the side surface of the movable plate 32, and this rack portion 32b engages with a drive gear, which will be described later, to linearly move the movable plate 32.

4 and 5 are diagrams showing the operation of the pinch roller holding mechanism, and FIG. 4 shows the position in the state where the tape is stored in the cassette L (hereinafter referred to as the unloaded state 8) and in the preloaded state described above. 5 shows the position at the time of completion of loading.

In the unloaded state and the preloaded state, the pinch roller 21 is located within the opening 2 of the cassette l. In FIGS. 4 and 5, reference numeral 36 denotes a rotation ring for moving the leading base 13 and the trailing base 9, respectively. A gear is formed on the outer periphery of the ring, and a drive gear 37 is provided.
It meshes with the outer gear 37a. The inner gear 37b of the drive gear 37 engages with the rack portion of the moving plate 32, and the holding plate 24 is held by a plurality of holding portions 38 provided on the main body of the apparatus. FIG. 6 is a cross-sectional view showing how the holding plate 24 is held by the holding part 38. Because it is held in this manner, the holding plate 24 can slide only in the direction of arrow B shown in FIG. The pinch roller arm 23 is biased counterclockwise by a spring 30;
The protrusion 23b of No. 3 contacts the cam member 39 to determine the position of the pinch roller 21.

Next, the operation of this pinch roller holding mechanism when changing from the unloading or preloading state to the loading state will be explained. In order to bring the tape into a loading state, the rotary ring 36 is rotated in the direction of arrow C shown in FIG. 4 by a motor (not shown). Then, in accordance with the rotation, the leading base 13 and the trailing base 9 move from the opening part 2 of the cassette 1 to the position shown by the solid line in FIG. On the other hand, the rotation of the rotation ring 36 rotates the drive gear 37 via the outer gear 37a of the drive gear 37. Then, the movable plate 32 is moved in the direction of the arrow shown in FIG. 4 via the rack portion of the movable plate 32 that meshes with the inner gear 37b of the drive gear 37. Since the moving plate 32 and the holding plate 24 are connected by a spring 35, as the moving plate 32 moves, the holding plate 24 also moves in the direction indicated by the arrow. At this time, the protrusion 23b of the pinch roller arm 23 moves while contacting the cam member 39, so the relative position of the pinch roller 21 with respect to the holding plate 24 is regulated, and the pinch roller 21 moves while drawing an appropriate trajectory while changing its relative position. To go. When the loading is completed, the state will be as shown in FIG.

In the loading state, when an operation switch (not shown) is used to command the capstan 20 to run the tape, the solenoid 40 is energized and the iron core 41 protrudes in the direction of the arrow E shown in FIG. In the loading state, the holding plate 24
is fixed at the position shown in FIG. 5, so when the iron core 41 protrudes, the iron core 41 presses the aforementioned projection 23a,
The pinch roller arm 23 is rotated clockwise about the shaft 25. Then, the pinch roller 21 moves to the capstan 2.
Press to 0. When the capstan 20 rotates in this state, the tape runs. Further, when the pinch roller 21 is released from the capstan 20, the energization to the solenoid 40 is stopped and the iron core 41 is returned into the solenoid so as to be in the state shown in FIG.

According to the above-described configuration, the pinch roller arm 23, which rotates in accordance with the cam member 39 that determines the movement path of the pinch roller, is also used to press the pinch roller against the capstan. The moving path of the roller can be freely determined, the structure is not complicated, and the number of parts to be stored in the cassette opening in an unloaded state can be reduced.

<Description of Effects> 1. As explained in 1-1 above, according to the present invention, the rotation of the arm that holds the pinch roller is used to determine the moving path of the pinch roller and to press the pinch roller against the capstan. By doing so, it is possible to obtain a recording or reproducing apparatus which can freely determine the moving path of the pinch roller with a simple configuration and which can reduce the number of parts to be housed in the cassette opening.

[Brief Description of the Drawings] Fig. 1 is a diagram showing the tape running system of a VTR as an embodiment of the present invention, Fig. 2 is a side view showing the holding structure of the pinch roller, and Fig. 3 is the same as Fig. 2. 4 and 5 are diagrams showing the operation of the pinch roller holding mechanism, and FIG. 6 is a diagram showing how the holding plate shown in FIG. 4 is held by the holding part. be. 1 is a cassette, 2 is a cassette opening, 9 is a trailing loading base, 13 is a leading loading base,
20 is a capstan, 21 is a pinch roller, 22 is a moving guide post, 23 is a pinch roller arm, 24 is a holding plate as a moving member, 39 is a cam member as a rotation regulating member, and 40 is a solenoid as a control member. be.

Claims (1)

[Claims] 1) A drawer member that pulls out the tape from inside the cassette, a capstan for running the tape pulled out by the drawer member, a movable member that moves according to the movement of the drawer member, and a capstan that is fixed to the movable member. an arm rotatably supported at one end on a shaft; a pinch roller attached to the other end of the arm; a rotation restriction member that determines the rotation position of the arm during movement of the moving member; and a control member that controls rotation of the arm to press the pinch roller against the capstan while the moving member is stopped.