JPS59113562A - Video tape recorder - Google Patents

Abstract

PURPOSE:To realize a micro VTR, by providing a boss, which supports freely turnably by a bearing a tape leading-out means and a tape winding means on the inside or the outside of the same shaft, and a driving means which drives these means at different timings. CONSTITUTION:As shown in Fig., a mode setting cam 102 is turned in the range of 0-270 deg. by the ejecting mode as the start point to set various modes. In the ejecting mode, the first leading-out arm 5 and a loading arm 12 are in the storage state as shown in Fig. A brake control lever 116 is engaged with the outside circumference of a brake cam 102b to release the brake of a reel base. Electric power is supplied to a loading motor 100 simultaneously with setting of a cassette, and the mode setting cam is turned counterclockwise from the eject mode position. The second following-up gear 111 which bites a loading gear 102a is turned clockwise by this turning, and the first leading-out arm 5 leads out the tape and is turned clockwise while performing the first loading.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a video tape recorder suitable for an ultra-small VTR such as an 8 mm video tape recorder.

(b) Prior Art In recent years, VTRs have become smaller and smaller, and a new standard VTR called 8-millimeter video has been developed. This 8mm video cassette does not have the tape guide roller that was conventionally installed near the cassette opening in order to make it more compact, so when the tape is completely stored in the cassette, the tape touches the side wall of the cassette opening. The tape cannot be run in this state. Therefore, when fast forwarding or rewinding, it is necessary to pull out the tape a little from the inside of the cassette so that the tape does not come into contact with the side wall of the cassette opening. It is necessary to provide a tape pulling means for pulling out the tape slightly from the inside of the cassette and keeping it in a state where it does not come into contact with the side wall of the opening of the cassette.

This makes the mechanism complicated, which hinders miniaturization.

(c) Object The present invention solves the disadvantage described in item E, and relates to a video tape recorder which has a simple mechanism and is suitable for miniaturization.

(d) Structure The present invention includes a tape pulling means for pulling out a tape from inside a cassette, a tape winding means for winding the tape around a guide cylinder at a predetermined angle, and a tape winding means for winding the tape at a predetermined angle. The video tape recorder is equipped with a boss rotatably supported on the inside or outside of the video tape recorder, and driving means for driving the tape drawing means and the tape winding means at different timings.

(PO) Example An embodiment of the present invention will be described below with reference to the drawings.

The mechanism of this embodiment can be divided into a loading mechanism and a mode setting mechanism.

First, the loading mechanism will be explained. FIG. 1 is a plan view of the loading mechanism in eject mode, and FIG. 2 is a left side view of the loading mechanism in play mode. The Guyton cylinder (1) is mounted on the cylinder (2) with a tilt 4, and on the lower side of the guide and cylinder there is a guide projection ( 3> are arranged in one piece.

In addition, a pair of first drawer arms (5) (5) are rotatably attached to the left and right pair of first support shafts (4 1 extraction pin (6) (6) is arranged.This 1st extraction pin is located in the notch (7a) formed in the cassette (7) in the eject mode, and when the tape (8) is extracted, the 1st extraction pin (6) is arranged.
11. The tape (8) is pulled out of the cassette (Z) by rotating the first pull-out arm through 90 degrees.

A second support shaft (9) is arranged near the first support shaft on the left side, and this second support shaft has a second pull-out pin (10) at its tip.
) is pivotally mounted on the second drawer arm (11). This second pull-out pin is also located within the notch in the eject mode and stop mode.

A pair of rotating arms (
12) (12>) is disposed, and the tip of this loading arm is connected to the center of the 10th-deing link.At one end of this 10th-deing link, a pair of 20-Deingrin') (14) (1
One end of 4) is fully connected, and a pair of left and right sliders (16) (16) are attached to the other end of the 20th connecting link via connecting pins (15) (L5). This connecting pin protrudes downward through the 20th leading link, and has a pair of guide grooves (17a) (17
a), and is slidable between an unloading position and a loading position.

Further, on the left slider, as shown in Fig. 3, a leading force is disposed in a rotating i'T function, and above it is a tape guide (18a) and a tape guide (18a) tilted in the direction of the tape kite. A tilt pin (18b) is provided. In addition, the guide lock and the slider are connected to a connecting pin (1
8c), and the connecting pin projects downward and engages with the kite groove. Further, the tape kite passes through the Mii lead kite block, protrudes downward, and engages with the guide groove.

--) 5, the connecting pin (1
A leading kite block (dan) is also distributed through the tape guide (19a), and the inclined pin (19b) is connected to the tape guide (19a).
) is in the opposite direction to the one on the left.

At the end of the guide plate 1, there is a fixing block (fixing block) for fixing the pair of tape guides at the loading completion position.
20) (20) are arranged.

Further, a pair of protruding pins (13a) (13a) are provided below the other end of the tenth-decking link,
In the unloading state, this protruding pin is inserted into the notch (21a) (21a) (21) of the pair of U-shaped guides (21) (21).
1a). And, on the open end side of this notch, an elastic wire-like kite rod (22) (22
), and when the tape is pulled out, the notch (21aH2
Continuing from step 1a), the protruding pin is guided and the protruding pin is guided into the notch when stored. Furthermore, a trapezoidal kite (23>(23)) is disposed near the guide rod and guides the protruding pin in succession to the kite rod (22)(22). A pair of rotating pieces (
25) and (26), which are pressed against the trapezoidal guide by torsion springs (27) and (27>), respectively.
It is biased in the opposite direction. Immediately before the row Ting is completed, the protruding pin 11i comes into contact with the rotating piece and rotates a little, and the table guard is pressed against the fixed block by the force of the torsion spring.

Incidentally, the second drawer arm and the left-hand rotation arm are connected by a connecting lever (lla).

Huck Tensaw 1/Lever (average) is rotatably supported on the fourth support shaft (29) and has a tension detection pin (28g) at one end.
), one of the other ends is provided with a spring (3o) which applies tension to the tape (8) by biasing it in a counterclockwise direction, and one end of the brake belt (31) is provided with one of the other ends. is fixed. This brake belt is wound around the supply-side boob of the supply and take-up reel stands (32, 33), and the other end is fixed to the shifter 2). Further, the back tenon lever is restricted from rotating in the counterclockwise direction by one end of the first drawer arm.

The supply and take-up reel stands are driven by a reel stand drive mechanism. This reel stand drive mechanism uses a reel motor (3
4) A drive gear (35) disposed on the drive shaft of the reel motor, an intermediate gear (36) that meshes with this drive gear, and a rotatable idler lever (37) that is disposed coaxially with this intermediate gear. and an idler gear (38) disposed on the idler lever and always meshing with the intermediate gear, but since this structure has no special features, detailed explanation will be omitted.

Also, fi? Each reel stand has a brake lever (39a) having a brake shoe (39a) at one end (39a).
The brake lever is configured to be controlled by a brake release pin (40) (40), which will be described later.

On the other hand, a pinch roller (42) is placed on one end of a pinch roller lever (41) that is pivotally supported on a fifth support shaft (24), and this pinch roller can be pressed into contact with a capstan (43). ing. At the other end of the pinch roller lever, an engagement pin (44) is connected to an arcuate notch (?) in the chassis (?).
It protrudes through 2a) and is controlled by a pinch roller crimping mechanism which will be described later.

The cassette can be raised and lowered by a cassette holder mechanism (not shown), and is positioned by cassette positioning pins (45) (45), (46) (46) when installed.

Next, the operation of the above-mentioned loading puff mechanism will be explained with reference to FIGS. 1, 4, and 5.

First, we will explain Enect mode. cassette(
Z) into the cassette holder (not shown) and push the cassette holder down to a predetermined position, the cassette holder is locked and the cassette is attached to the positioning pin (45).
(45) (46>) is positioned at a predetermined position by (46>). In this state, as shown in FIG. 2 drawer pins (10), leading guide blocks (18) (19)
) and a pinch roller (42>) are located.

In addition, the connection points of the tenth pointing link (13) <13) and the twentieth nine link (14) <14) are bent, and the protruding pins of the tenth pointing link <13a) (13a) are respectively U-shaped guides (21)
(21) is engaged in the notch (21a) (21a). Also, in this state, brake levers (39) (39)
The brake state is released by the brake release pin (40>(40)).

iii. When the upper cassette is installed in the normal position, a cassette detection switch (not shown) is activated, and a loading tanabata to be described later is energized. This energization causes the first drawer arms (5) (5) to move around the first support shafts (4) (4), respectively.
As shown in FIG. 4, the cassette is rotated approximately 90'' outward.

As a result, the 10th ding operation is performed and the tape (8
) is slightly pulled out by the first pull-out pins (6) (6), and this becomes the strike mode. In this stop mode, the brake release lever moves from the position shown in Figure 1 to F force, so the brake shoe (39a) (3
9a) engages the pulleys of the supply and take-up reel stands (32) (33). In this mode, the tape (8) is not in contact with the guide cylinder 1) and the cassette gate.

In this stop mode, when fast forwarding and rewinding operations are performed, the tape (8) is run in this state. Note that at this time, the brake lever is released.

Next, when you perform a playback operation from stop mode, the leading kite blocks (18) and (19) pull out the tape (8),
A 20th dewing operation is performed which wraps around the kite cylinder (1) by about 210 degrees.

This operation will be explained in detail regarding the right side loading mechanism. First, the loading arm (12) rotates clockwise.This rotation causes the loading arm (12) to rotate clockwise.
IL The protruding pin (13) that engages with the U-shaped guide (c)
Rotate around a) in the force direction and push up the 20th bearing (14) upward in Figure 1. Therefore, the connecting pin (15) that engages with the kite groove (17a) and the lower end of the tape guide (19a) move from the bottom to the top in the figure along the kite groove while pulling out the tape (8), and lock the leading kite. (19) pulls out the tape (8). When the loading arm further rotates, the protruding pin escapes from the notch (21a) of the U-shaped guide and comes into contact with the kite rod (22), causing a slight drop. The period will be announced. When the 1'ff-ding arm further rotates V, the protruding pin separates from the guide rod and becomes a trapezoidal kite.
3) The engagement guide can be completed. Furthermore, the connection point of the first and 20th-dewing links (13) (14) is the kite protrusion 3).
You will be advised of the bond. By restricting the positions of the protruding pin and the connection point of the diamond kite and O-guide protrusion, respectively, the first and 20th links are prevented from bending each other, and the loading arm shown in white 11 is driven. This is for transmitting force to the lead kite pro.

Then, the leading guide block is a fixed block (20
), the protruding pin moves to a position close to ])1
1. Separated from the trapezoidal kite and abutted against the rotating piece (26), the rotating piece is rotated in the direction 51 against the bias of the torsion spring (27), and at the same time, the connection point is connected to the guide. Also stay away from the protrusion. Further, when the leading guide block reaches the end of the guide groove (17a) and the tape guide (19a) and the inclined pin (19b) engage with the fixed block as shown in Figure @5, the rotation of the loading arm is stopped. Stop. In this state, the 10th holding link is forced to rotate in the direction of force by the rotating piece, so the leading guide plate is pressed against the fixed plate on the surface and is fixed in position. The angle at which the tape (8) is wound onto the kite cylinder (1) is precisely defined.

On the other hand, in conjunction with the rotation of the rope swing arm, the pinch roller (41) also rotates clockwise, and after the leading guide lock comes into contact with the fixed block, the pinch roller (42) Press the carb stamp (43),
The play mode is entered and playback operations are performed continuously.

In addition, the second drawer arm (see) is connected /1-(lla
) is connected to the left loading arm (12)
It rotates to the position shown in FIG. 4 in conjunction with the rotation of , and the tape (8>) is mounted on the tension detection pin (28a).

Next, if you perform a recording operation from the stop mode,
The 20th "taking" is performed in the same way as during the playback operation, but
Even after the 20th daying is completed, the pinch roller arm is stopped at a position where the pinch roller and the cab stun are kept apart, and this state is set as a recording standby mode. When the pose release operation is performed from this recording standby mode, the pinch roller luff 42> will move to the capstan (
43) and enters the state shown in FIG. 5, entering the recording mode.

Further, when a stop operation is performed from the recording or reproducing mode, unloading is performed in an operation completely opposite to the above-mentioned 20th-ting operation, resulting in the stop mode shown in FIG.

Further, when an eject operation is performed from this stop mode, the cassette/7 holder is unloaded in an operation completely opposite to the 10th dewing operation, resulting in the work/7 eject mode shown in FIG. 1, and the skein/7 holder is raised continuously.

Next, a mode setting mechanism that drives the above-mentioned loading mechanism and also sets a mode will be explained.

FIG. 6 is a plan view of the mode setting mechanism in the play mode, and FIG. 7 is a sectional view of the same on the right side, and the mode setting mechanism is arranged on the lower surface of the chassis (?). Rotating motor (
The motor gear (101) connected to the mode setting cam (100) is engaged with the mode setting cam (102a) by a loading key provided on the outer periphery of the mode setting cam (102). This engine setting cam is pivotally supported by a fifth support shaft (103) that protrudes from the underside of the engine, and in addition to the loading gear, the brake force l, (102b) that controls the brake lever, It integrally includes a spirally cut rotating arm drive cam (102c), a first drawer arm drive cam (102d), and a pinch roller cam (102e).

A fan-shaped gear is pivotally supported on the sixth support shaft (104), and an engagement pin (105a) disposed on the fan-shaped gear 1 and - is engaged with the rotating arm drive cam. Further, a first intermediate gear (106) meshes with this fan-shaped gear.This first intermediate gear is connected to a pair of seventh support shafts (107) (
107), and a pair of second intermediate gears (10g) (108) that mesh with each other are pivotally supported on this seventh support shaft. The first intermediate gear and one of the second intermediate gears are integral with each other.

As shown in FIG. 7, a pair of gear boxes are coaxial with the pair of first support shafts (4>(4) and on the bottom surface of the chassis).
109>(109) is arranged. A cylindrical boss (109a) is formed in the center of this gearbox, and this hub bears the first support shaft inwardly, and
A first driven gear (110) is supported on the outside.

The first driven gear is integrally connected to the rotating arm and meshes with the second intermediate gear V.

- On the other hand, a second driven gear (111) is integrally coupled to the first support shaft on the right side together with the first drawer arm 1. This second driven gear has a cutout (lla) formed in the southern part of the second driven gear so that it can be engaged with the loading key.

Further, a pair of foils (112) are attached to the pair of first support shafts.
(113) is connected, and both foils are connected to each other.
They are connected by a foot (114). A portion of the right side foil (112>) is missing, and the rotation regulating bottle (115) installed on the bottom surface of the key box allows
The rotational position of the first drawer arm is regulated when the first drawer arm is drawn out.

Further, a locking pin (112a) is disposed on the right side boiler 1rI and is engageable with the first drawer arm drive cam. Furthermore, the left side coil (113) is urged in the counterclockwise direction by a spring (not shown), and therefore the right side coil (113) is urged in the clockwise direction.

Further, a rotatable brake control lever (116) is engaged with the brake cam, and this brake control lever is engaged with a slide lever (117) equipped with a rake release pin as described in O1I. It matches. This slide lever is formed with through holes (117a) (117b), into which loose fitting pins (118) and (119) corresponding to the above-mentioned N to -N are loosely fitted, respectively, so that the brake control lever can be rotated. It is possible to slide.

Next, the operation of the mode setting mechanism described above will be explained with reference to FIGS. 6, 8, and 9.

As shown in 8'l:A, the mode setting cam (102) sets each shade by rotating within the range of 0'' to 2706 with the eject mode as the starting point.

First, in the eject mode, as shown in FIG. 8, the first drawer arm (5) and loading arm (12) are in the retracted state. Further, the brake control lever (116) is engaged with the outer periphery of the brake cam (102b), and the rotation to the reel stand is released.

Next, install the cassette and load motor (10
0) is energized, and the mode setting cam rotates counterclockwise from the 7th position. This rotation causes the second driven gear (L) to mesh with the coding gear (102a).
(2) or clockwise, and remove the first drawer arm (5).
Pull out the tape and perform the 10th digiting, then rotate it clockwise. When the second driven gear rotates to a predetermined position, the loading gear faces the cutout (lla) of the second driven gear, so that the meshing is released.

However, since the foil <112) is fully biased in the clockwise direction as described above, the first drawer arm continues to rotate and stops when the boiler engages with the rotation restriction pin.

Furthermore, the mode setting cam of 0i7 is set to 75 from the en-ext position.
When rotated by .degree., the loading motor stops and enters the stop mode as shown in FIG. In this state, the brake control lever rotates counterclockwise to engage with the recess of the brake cam, thereby pressing the brake lever against the reel stand. Further, in this state, the diameter of the loading arm drive cam (102c) is the same as in the rainbow and black modes, so the fan-shaped gear (105) is not displaced and the loading arm (12) is still in the retracted state.

In this stop mode, when fast forwarding and rewinding operations are performed, the mode setting cam rotates 30 degrees clockwise, that is, toward the eject mode.

Therefore, the brake control lever rides on the outer periphery of the brake cam and rotates clockwise, so that the brake of the reel stand is released.

Furthermore, when a recording operation is performed in the stop mode, the mode setting cam rotates counterclockwise by 150" and enters the recording standby mode. Due to this rotation, the diameter of the loading arm drive cam is continuously reduced. The fan-shaped gear rotates in the gear direction.

Therefore, since the first and second intermediate gears (106) and (108) rotate counterclockwise, the first driven gear (110) and loading arm (12) rotate clockwise, and the second
0! - ding is done. Furthermore, the brake applied to the reel stand is released by rotation of the m+ mode setting cam.

In this recording standby mode, the pinch roller and the press stand are kept close to each other by a pinch roller cam, which will be described later, and kept in a state where they are separated from each other.

Furthermore, when the pause release operation is performed in this recording standby mode, the mode setting cam further moves counterclockwise by 45° in the j direction.
It rotates to enter the play mode shown in FIG. Furthermore, this 45
During the rotation, the diameter of the rotating drive cup does not change, so the position of the rotating blade does not change.

Further, when a playback operation is performed in the πI stop mode, the mode setting cam does not stop in the recording standby mode but rotates to the play mode position.

Further, when an eject operation is performed on the ST7bmo mill, the mode setting cam rotates clockwise. At this time, the first drawer arm drive cam (102d) engages with the engagement pin (112a) provided on the boiler (112),
Together with this wheel, the second driven gear is slightly rotated counterclockwise. Therefore, one coating (102a) of the mode setting cam is applied to the second driven gear.
At this time, the first drawer arm is in the retracted state as shown in FIG. The unloading operation from the play mode to the stop mode is performed in the exact opposite manner to the 20th loading operation.

Next, the pinch roller crimping operation will be explained.

Figure 10 is a perspective view of the pinch roller crimping mechanism, Figures 11~
FIG. 13 is an explanatory diagram of the operation of the pinch roller pressure bonding mechanism in the stop mode, recording standby mode, and play mode, and shows the engagement pin (41) of the pinch roller
44) is pressed by a pinch roller through the notch in the chassis (2) and is loosely fitted into the through hole (120a). This pinch roller crimping leno h- is the eighth support shaft (121
) and is biased counterclockwise by a machine return lever (122). An engagement lever (123) is also pivotally supported on this eighth support shaft, and a pinch roller cam (
102e) becomes engageable. The pinch roller presses/<- and engages/1-(pressure bar: 4 (
124) in opposite directions.

As shown in FIG.
3) are spaced apart, and pinch roller reno < - (41>
(for return) is in the return position by 1 (122).

As shown in FIG. 12, in the recording standby mode No. 1ζ, the mode setting cam is engaged by rotating the mode setting cam in the counterclockwise direction. The pinch roller approaches the capstan (43) in order to rotate in the direction shown in FIG.

Furthermore, as shown in FIG. 13, in the play mode, the engagement lever engages the maximum diameter portion of the pinch roller cam, so the pinch roller comes into contact with the front stopper.

At this time, the engaging member /1- rotates a little with respect to the pinch roller crimper /\-, and the pinch roller 4 presses against the capstan with a predetermined pressing force due to the action of the crimping spring.

According to the present invention, as described above, by arranging the tape pull-out means and the tape winding +1 means on the same axis, the space occupied by the spindle can be reduced, so that the limited base can be used. It can be used for one effect. Further, since the drive mechanism of both means can be made common, the mechanism can be simplified and an ultra-compact VTR such as an 8 mm video can be realized.

[Brief explanation of drawings]

The drawings all relate to one embodiment of the present invention, and FIG. 1 is a plan view of the loading mechanism in the en-ext mode, and FIG.
The figure is a left side view of the same in play mode, Fig. 3 is a cross-sectional perspective view of the left leading guide block, Fig. 4 is an explanatory diagram of the operation of the rotating mechanism in stop mode, and Fig. 5 is the same operation in play mode. For explanation, Figure 6 is a plan view of the mode setting mechanism in play mode, Figure 7 is a right sectional view of the same in play mode, Figure 8 is an explanatory diagram of the same operation in extend mode, and Figure 9 is the same in stop mode. 10 is a perspective view of the pinch roller pressure bonding mechanism, FIG. 11 is an explanatory diagram of the same operation in stop mode, FIG. 12 is an explanatory diagram of the same operation in recording standby mode,
FIG. 13 is an explanatory diagram of the same operation in play mode t. Explanation of main drawing numbers (1)... Guyton cylinder, (4) (4>... first support shaft (5) (5)... first drawer arm, (6) (
6>...1st drawer pin, S)...Cassette (8)...
・Deso, (12)(12)...Rotating arm, (13)(
13)...10th - Taing Link, (14) (14)
... 20th - Deing link, (16) (16) ... Slider, (18) (19L Leading guide block, (102)
・Mode setting cam, ku±)ku±> Gear box, (110)(110)...1st driven gear, <lsu,)・
...Second driven gear, (J-tsubo) (113)...Foil. Figure 4Figure 3

Claims (1)

[Claims] (1) A tape pulling means for pulling out the tape from the inside of the cassette; a tape winding means for winding the tape around a guide cylinder at a predetermined angle; Alternatively, a video tape recorder comprising a boss rotatably supported on the outside, and driving means for driving the tape drawing means and the tape winding means at different timings.