JPS59113563A - Driving mechanism of tape drawing-out means - Google Patents

Abstract

PURPOSE:To share easily a driving source among a tape drawing-out means and other mechanisms, by driving the tape drawing-out means up to a tape storage position by a driving gear after a driving gear and a following-up gear bite each other on the way of tape storing. CONSTITUTION:When a reproducing operation is performed in the stop mode, a loading arm 12 is turned clockwise. By this turning, the first loading link 13 is turned clockwise with a projecting pin 13a, which is engaged with a U-shaped guide 21, as the center to push the second loading link 14 upward in Fig. Therefore, a connecting pin 15 engaged with a guide groove 17a and the lower end of a tape guide 19a are moved along this guide groove upward from below in Fig. while leading out a tape 8, and a leading guide block 19 draws out the tape 8. When the loading arm is turned, the projecting pin is separated from a guide rod and is engaged with and guided by a trapezoidal guide 23. Further, the connection point of the first and the second loading links 13 and 14 is engaged with and guided by a guide projection 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a tape ejecting means drive mechanism in 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 L-standard VTR called 8mm video has been developed. This 8mm video cassette eliminates the tape guide roller that was conventionally installed near the cassette opening in order to make it more compact.
The tape cannot run when it is completely stored in the cassette.

For this reason, fast-forwarding and rewinding operations must be performed with the tape slightly pulled out from inside the cassette, and a second loading means must be used in addition to the first loading means that winds the tape around the guide cylinder. I need.

(For the miniaturization of VTRs,
and the rotation support shaft of the second loading means is coaxial; 1.
It would be desirable to have a common drive mechanism. However, if a common drive mechanism is used, the first and 20th ring mechanisms must be driven at different timings, so a means for engaging and disengaging the drive source is required, making the mechanism very difficult to operate. It had the disadvantage of being complicated.

(・＼) Purpose The present invention solves the drawbacks listed in
0-The ink mechanism is coaxial, and the drive and source are common.-C
The present invention also provides a tape draw-out means drive mechanism that does not require a complicated mechanism.

2) Structure The present invention provides a video tape recorder that performs recording and playback by taking a tape out of a cassette and winding it around a drawer guide sill at a predetermined angle. means for biasing the tape drawing means, means for defining the position of the tape drawing means in the drawn state, a driven gear coupled to the drawing means and having a partially cut out tooth portion thereof, and a driven gear for driving the driven gear. It consists of a drive gear C, an engagement pin disposed integrally with the driven gear m7, and a cam that is provided integrally with the drive gear and is removable from the engagement pin. The driven gear is fully driven by the forward rotation of the driving gear, the driving gear faces the cutout part in the middle of drawing out the tape, and after the driving gear and the driven gear Rij are disengaged, the tape drawing means The biasing means drives the tape to the draw-out position, and when storing the tape, the reverse rotation of the drive gear engages the cutter l111 with the engagement pin 0jj, and the driven gear is driven, and the tape is pulled out. The tape drawer drive mechanism is characterized in that after the drive gear and the driven gear are engaged during storage, the tape drawer is driven to a tape storage position by the drive gear.

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

The mechanism of this embodiment can be roughly divided into a coach ink mechanism and a mode setting mechanism.

I will explain the mass and low eye mechanism. FIG. 1 is a plan view of the rotating mechanism in the eject mode, and FIG. 2 is a left side view of the same in the butt mode. The kite link (1) is installed inclined upwards on the chassis (2), and a kite protrusion (3) is integrated into the lower side of the kite link to guide a part of the loading means (described later) during loading. It is located in

In addition, a pair of first drawer arms (5>(5>) are rotatably attached to the left and right pair of first support shafts (4), and a pair of first drawer arms (5>) are rotatably attached to the left and right pair of first support shafts (4). 1 drawer pin (6) (6) is arranged.This first drawer pin is located in the notch (7a) formed in the cassette (2) in the eject mode, and when the case 8) is pulled out, !iI The tape (8>) is pulled out to the outside of the cassette (Z) by rotating the first drawer arm by 2''0°.

A second support shaft (9) is arranged near the first support shaft on the left side, and a second drawer bin (10) is attached to the tip of this second support shaft.
A second drawer arm ( ) is pivotally supported. This second drawer arm is also located within the notch in the exact mode and the stoknob mode.

A pair of loading arms (12>(12)) are disposed coaxially with the first support shaft described in +7ii, and a first [J-ring link (12)] is disposed at the tip of this loading arm. 13〉 medium heat.One end of this 10th ding link is connected to a pair of 20th ding links (
14) One end of (14) is connected, and a pair of left and right sliders (16) are attached to the other end of this 20th link via connecting pins (15) (15). This connecting pin protrudes downward through the 20th connecting link, and engages with a pair of guide grooves (17a) (17a) formed in the guide plate (H) disposed on the chassis. The handle is slidable between an unloading position and a coating position.

In addition, on the left slider shown in 91f, a leading guide block is rotatably arranged as shown in 3tA, and above it (a tape kite (18a) and an inclined pin tilted in the direction of the cheap kite (18a)). 18b) is provided.Furthermore, the kite lock 111 and the slider are connected by a connecting pin CL8c), which protrudes downward and engages with the kite groove. Further, the tape kite protrudes downward through the leading guide hole [J-7] and engages with the kite groove.

On the other hand, there is also a connecting pin (19c) on the right meritor.
) A leading guide is placed through the guide.
The direction of inclination of the inclined pin (19b) with respect to the tape kite (19a) is the opposite jj direction from that of the one on the left side.

Fixing blocks (20) (20) for fixing the pair of tape guides (mi) at the loading completion position are arranged at the ends of the mf guide plate.

In addition, the lower node of the other end of the 111th No. 10-Ding link
is provided with a pair of protruding pins (13a) (13a>), and in the unloading state, this protruding pin
Notch (21a) of a pair of U-shaped guides (C) (U) (
21a>. The open end side of this notch has a bullet 14. 4 gold-shaped kite sticks (22) (
22) When pulling out the IC and the tape, the notch (21
a) When the protruding pin is guided continuously from (21a), the protruding pin is guided into the notch described in 01j when stored in 8.J-
Ru. Furthermore, a trapezoidal kite (23>(
23) are arranged to guide the protruding pin continuously to the kite rod (22) (22). Furthermore, a pair of rotating pieces (25) and (26) are disposed near the lii+ trapezoidal kite, and are pivotally supported on the second and third support shafts (24), respectively,
They are each biased in a direction in which they are brought into pressure contact with the trapezoidal guide by tone springs (27) and (27). Immediately before the loading is completed, the projecting pin comes into contact with the rotating piece and rotates, and the tape kite marked i1 is pressed against the fixed block by the biasing force of the toe/yong/<ne.

In addition, the second Hikita arm and the left fJl! It is connected to the 10-ding arm by a connecting lever (lla).

The fourth support shaft (29) is
It is rotatably supported on the
a, and one of the other ends is biased counterclockwise and applied to the tape <8>. One end of the brake belt (31) is fixed to one end of the brake belt (31). It is wrapped around the supply side boob, and the other end is fixed to the shear (2).

Further, the rotation of the back tension lever in the counterclockwise direction is restricted 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
4L The drive key placed on the drive shaft of this reel motor? (35), an intermediate gear (36) that meshes with this drive gear, an idler lever (37) that is arranged coaxially with this intermediate gear and is rotatable, and an idler gear that is arranged on this idler lever and that always meshes with the intermediate gear. (38), or since this structure has no special features, a detailed explanation will be omitted.

In addition, each of the reel stands has a lucky shoe (
Brake lever with 39a ) < 39a )
This 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 the pinch roller lever (41) which is pivotally supported on the fifth support shaft (24), and this pinch roller can be pressed against the capstan (43). It becomes. At the other end of the pinch roller lever, an engagement pin (44) is connected to an arcuate notch (3) in the chassis (3).
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 can be completely positioned by cassette positioning pins (45) (45) (46) (46) when installed.

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

First, the eject mode will be explained. Casseso 1-
(7) into a cassette holder (not shown) and push down this cassette holder to a predetermined position, the cassette holder is locked and the cassette is fixed to the positioning pin (45).
)(45)(46)(46). In this state, as shown in FIG. 1, in the notch (7a) of the cassette, there are
Pull-out pin <10), leading kite block (18) (1
9) and a pinch roller (42>) are located.

Further, the connection points of the tenth pointing links (13) (13) and the twentieth pointing links (14) (14) are bent, and the protruding pins (13a) (13a) of the tenth pointing links are bent. People, U-shaped kite (21>
(21) is engaged in the notch (21a>(21a). Also, in this state, the brake lever (39) (39
), when the brake state is completely released by the brake release pins (40) (40) and the cassette is fully installed in the predetermined position, a cassette j-detection switch (not shown) is activated and a loading motor, which will be described later, is energized. This energization causes the first drawer arms (5) (5) to move to the first support shafts (4) (4).
) about 90° toward the outside of the cassette, as shown in FIG. As a result, the tenth pulling operation is performed and the tape (8) is slightly pulled out by the first pull-out pins (6) (6), which becomes the stop mode. In this stop/stop mode, the brake release pin moves downward from the position shown in FIG.
) (33) is engaged with the pulley. In this mode, the tape (8) is not in contact with the guide cylinder (1) and the cassette case.

Then, in this stop mode, when fast forwarding and rewinding operations are performed, the tape is run in the same state as before.At this time, the brake lever is released.

Next, when you perform a playback operation from stop mode, the leading guide block (1B>(19) pulls out the tape (8),
A 20th winding operation is performed, which winds approximately 2106 turns on the guide cylinder (1).

This operation will be explained in detail regarding the right side loading mechanism. First, the rotating arm (12) rotates clockwise. Due to this rotation, the 10th ring (civilian) rotates in the direction of time S about the protruding pin (13a) that engages with the U-shaped kite (21), and the 2nd ring (14)
Push up upward in Figure 1. Therefore, Kite iM(1
7a) and the tape guide (
19a) while pulling out the tape (8) at the lower end of this kite 7g! :: 19 moves from the bottom to the top in the figure, and the leading Kaidonorosoku (su) pulls out the tape (8). When the rotating arm further rotates, the protruding pin escapes from the notch (21a) of the U-shaped kite, comes into contact with the kite rod (22), and is guided for a short period of time. When the arm rotates, R1r
The marking protruding pin is spaced apart from the marking kite rod and the trapezoidal kite (2
3) is engaged and guided. Furthermore, the connection point of the first and twentieth bearing links (13) and (14) is the guide protrusion (3).
is engaged and guided. The trapezoidal guide and guide protrusion are
By restricting the positions of the protruding pins and connection points, the first and second u-ding links are prevented from bending each other, and the driving force of the rotating arm is transmitted to the leading guide block. .

Then, the leading kite block is fixed (20
), the protruding pin separates from the trapezoidal guide and comes into contact with the one-swivel piece (26), resisting the bias of the torsion spring (27), causing the protruding pin to move away from the trapezoidal guide (1) at -C.
τ1. At the same time, the connection point Ait is moved away from the kite projection. Furthermore, the KI guide guide guide 1' groove reaches the end of the kite groove (t7a), and as shown in FIG.
) engages with the fixed block, the rotation of the rotating arm lI:f stops. In this state, the 10th
- Since the leading link is urged to rotate clockwise by the rotating piece, the leading guide block is pressed against the fixed block side and fixed in position, and the tape (8>) is wound around the guide cylinder (1). defines the angle precisely.

On the other hand, in conjunction with the rotation of the rotating arm, the pinch roller arm (41) also rotates clockwise. ! ff
After the guide guide roller 7 comes into contact with the fixed block, the pinch roller (42) comes into pressure contact with the cab stamp (43),
The play mode is entered and playback operations are performed continuously.

The second drawer arm (11) also has a connecting lever (lla
) The left rotating arm (12) that has not been connected to
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 taing is performed in the same way as during the regeneration operation, but even after the 20th taing is completed, the pinch roller arm is stopped at a position where the bin propeller and the capstan are maintained at a distance Mi apart from each other. This state is set as recording standby mode. When the pause release operation is performed from this recording standby mode, the pinch roller (42) presses against the capstan (43), resulting in the state shown in FIG. 5, and the recording mode is entered.

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.

Furthermore, when an eject operation is performed from this stop mode, the cassette holder is unloaded in an operation completely opposite to the 10th dewing operation, and enters the first UA's eject mode, and the cassette holder is continuously raised.

Next, a mode setting mechanism that drives the aforementioned 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.
The motor gear (101) connected to the motor gear (100) is engaged with a mode setting cam (102>low rotating gear 102a provided on the outer periphery). In addition to the rotating gear, there are a brake cam (102b) that controls the brake lever, a spirally cut rope 1, a drive cam (102c),
It integrally includes a first drawer arm drive cam (102d) and a pinch coke cam (102e).

A fan-shaped gear (105) is pivotally supported on the sixth support shaft (104), and an engagement pin (105a) arranged on this fan-shaped gear
is engaged with the rotating arm drive cam. Further, a first intermediate gear (106) is engaged with this fan-shaped gap. This first intermediate gear has a pair of seventh support shafts (107)
(107), and a pair of second intermediate gears (108) (108) that mesh with each other are pivotally supported on this seventh support shaft. One of the first intermediate gear and the second intermediate gear is integral with each other.

As shown in FIG. 7, a pair of gear boxes (...) (...) are disposed coaxially with the pair of first support shafts <4) <4) and on the lower surface of the shaft. A cylindrical boss (109a) is formed in the center of this gear box/box, and this boss bears the first support shaft inwardly, and the first driven gear (110) bears outwardly. It's been done. this@
The first driven gear is integrally connected to the loading arm and meshes with the second intermediate gear.

On the other hand, the first pull-out arm and the second driven gear are integrally connected to the first support shaft. This second driven key has a missing part (where the southern part is missing) (
lla) is formed so that it can be engaged with the roady gear.

Further, a pair of foils (112>
(113) are connected, and both foils are connected by a connection/yaft (114). A portion of the right side foil (cloud) is missing, and a rotation regulating bottle (115) installed on the bottom surface of the gear box/box (n11) controls the rotation position of the first drawer arm when it is pulled out. It is regulated.

Furthermore, an engagement pin (112g) is disposed on the right side boiler and can be engaged with the first drawer arm drive cam. Further, the left side foil (113) is biased counterclockwise by a spring (not shown), and the right side foil (113) is therefore fully biased clockwise.

':1' A rotatable brake control lever (116) is engaged with the brake cam, and this brake control bar is engaged with a slide lever (117) on which the brake release pin is arranged. are doing. This slide lever is formed with a through hole (117a>(117b), into which loose fitting pins (118) and (119), which are equivalent to the shear, are loosely fitted, respectively, and slide by rotation of the brake control lever. It is possible.

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

As shown in FIG. 8, the mode setting cam (intestine) sets each mode by rotating within a range of 00 to 270'' starting from the entrainment mode.

First, in the eject mode, as shown in FIG. The brake to the engaged reel stand is released.

Next, with the cassette installation, the loading motor (100
) is energized and the mode setting cam rotates counterclockwise from the Enextose position. 1-1- by stiff rotation
The second driven gear meshing with the line gear (102a) rotates clockwise, and the first pull-out arm (5) pulls out the tape and performs the tenth drawing, and then rotates clockwise. When the second driven gear is rotated to a predetermined position, the U-ding key V faces the cutout (lla) of the second driven gear described in 01f, so that the engagement is completely released. However, since the foil (±) is biased clockwise as described in section 11, the first drawer arm rotates continuously and stops when the foil engages with the rotation regulating pin.

When the mode setting cam further rotates 75" from the NJ position, the loading motor stops and enters the stop mode as shown in FIG. 9. In this state, if the bushing brake control lever The rotating arm drive cam (102c) rotates counterclockwise to engage with the reel stand, and presses the brake lever (η) against the reel stand.In addition, in this state, the diameter of the rotating arm drive cam (102c) is different from that in the garlic tomo mode. Therefore, the fan-shaped gear (1) is not displaced, and the rotating arm (12>) is still in the retracted state.

When fast forwarding and rewinding operations are performed in the stop mode, the mode setting cam rotates 30'' clockwise, that is, toward the eject mode.

Therefore, the mf 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 150 degrees counterclockwise, and the recording standby mode is entered. As a result of this rotation, the diameter of the rotating arm drive cam becomes smaller continuously, and the rotating arm drive cam rotates in the fan-shaped gear direction indicated in iii.

Therefore, since the first and second intermediate gears (106) (10B) rotate counterclockwise, the first driven gear <110) and the rotating arm (12) rotate clockwise, and the second
0-deink is done. Furthermore, the brake applied to the reel stand can be completely released by rotating the mode setting cam.

In this recording standby mode, the pinch roller and capstan are maintained close to each other or separated by a pinch roller cam, which will be described later.

Furthermore, when a pause release operation is performed in this recording standby mode, the mode setting cam further moves counterclockwise by 45 degrees.
It rotates to enter the play mode shown in FIG. Furthermore, this 45
Since the diameter of the loading drive cam does not change during the rotation of the loading arm, the position of the loading arm does not change.

Also, when a playback operation is performed in the stop mode described in 111], the mode setting cam in
It rotates 1'f continuously without stopping until it reaches the play mode position.

Further, when an eject operation is performed in the stop mode, the mode setting cam rotates clockwise. At this time, the first drawer arm drive cam (102d) engages the engagement pin (112a) provided on the hole <11.2.
), and together with this wheel, the second driven gear is rotated counterclockwise. Therefore, the rotating gear (102a) of the mode setting cam meshes with the second driven gear, and the first drawer arm is in the retracted state as shown in FIG. Incidentally, the unloading operation from the play mode to the stop mode is performed in the exact opposite manner to the 20th-daying operation.

Next, the pinch roller crimping operation will be explained.

FIG. 10 is a perspective view of the bi/ch 1 fuller crimping mechanism, and FIGS. 11 to 13 are explanatory views of the operation of the pinch roller crimping mechanism in stop mode, recording standby mode, and play mode, respectively, and the pinch roller lever ( 41) Engagement pin <
44) is loosely fitted into the through hole (120a) of the pinch roller pressure lever (129) through the notch of the hinge (2). This pinch roller pressure lever is attached to the eighth support shaft (121
> and is biased counterclockwise by a return spring (122). An engagement lever (123) is also pivotally supported on this eighth support shaft, and a pinch roller cam (123) is also pivotally supported on this eighth support shaft.
02e). The pinch roller pressure lever and the engagement lever are urged in opposite directions by the pressure spring (124). As shown in FIG. 11, in the stop mode, the pinch roller cam (102e) and the engagement lever (123) are separated. The pinch roller lever (41) is at the return position by the return lever (122).

As shown in FIG. 12, in the recording standby mode, when the mode setting cam No. 117 rotates counterclockwise, the engagement lever engages the pinch roller cam and rotates clockwise, so that the pinch roller cam is rotated clockwise. Laura is the capstan (4
3) Close to.

Further, as shown in FIG. 13, in the play mode, the engagement lever engages with the maximum diameter portion of the pinch roller cam, so the pinch roller comes into contact with the capstan. At this time, the engagement lever rotates slightly relative to the pinch roller pressing lever, and the pinch roller is pressed against the capstan with a predetermined pressing force by the action of the pressing spring.

(f) Effects As described above, according to the present invention, a cutout is provided in the teeth of the driven gear of the tape drawing means, and when the tape is drawn out, the engagement between the driven gear and the driving gear is released during the tape drawing. In the drawn-out state, the drive gear can drive other mechanisms such as tape winding means without any hindrance, so the drive source for the tape drawing-out means and other mechanisms can easily be shared.

[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 eject mode, and FIG.
The figure is a left side view of the same in play mode, Figure 3 is a cross-sectional perspective view of the left-hand leading kite rope, Figure 4 is an explanatory diagram of the operation of the loading mechanism in stop mode, and Figure 5 is the same operation in play mode. Explanatory diagram: 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 eject mode, and Figure 9 is the same operation 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, Section 12 is an explanatory diagram of the same operation in recording standby mode, and FIG. 13 is an explanatory diagram of the same operation in play mode. Explanation of the main drawings (1)... Guide cylinder, (4) (4)... First support shaft, (5) (5)... First drawer arm, (6) (6 )・
・・First drawer pin/, (7) ・・Cassette, (8)・・Tape, (10
2)・Mode, setting cam, (102a) Loading gear, (102d)・
・First drawer arm drive cam, (Hl>-second driven key A
・, (lla)... Defected part, (112a)・Retaining pin, (115)・Rotation regulating pin. Applicant: Sanyo Electric Co., Ltd. 2゜:lney, + Agent: Patent attorney Shizuo Sano"4.j','lihe11/
' f Figure 3

Claims (1)

[Claims] (1) In a video tape recorder that performs recording and playback by winding a tape from inside a cassette at a predetermined angle around a drawer guide cylinder, a tape ejecting means for drawing out the tape from inside the cassette, and the tape ejecting means are attached in the tape drawing direction. a means for determining a position of the tape drawing means in the drawn state; a driven gear coupled to the drawing means and having a portion of a tooth portion thereof and a cutout; The tape comprises a drive gear that drives the gear V, an engagement pin disposed integrally with the driven gear, and a cam that is disposed integrally with the drive gear and is removable from the engagement pin, and when the tape is pulled out, Due to the forward rotation of the drive gear, the driven gear is driven out, and the drive gear faces the cut-out part in the middle of drawing out the tape, and after the engagement between the drive gear and the driven gear is released, the tape is removed. The withdrawal means is as described in 1 above.
At the same time, when the tape is stored, the cam engages with the engagement pin by the reverse rotation of the driving gear, and the driven gear is driven. After the driving gear and the driven gear are engaged, the tape pulling out means is driven to a tape storage position by the driving gear.