JPS5823355A - Tape loading mechnaism for small-sized video tape recorder - Google Patents

Abstract

PURPOSE:To make the size of titled device small, by minimizing the notch through the provision of a pinch roller at the center of a cassette notch and of pins on a loading block at both sides, and opposing pinch rollers on capstans after tape drawout. CONSTITUTION:At the stop mode, a pinch roller 79 is located at the center of a cassette notch and guide pins 62 and 54 and taper pins 63 and 55 of loading blocks 51 and 52 are located at both sides of the roller 79. When the loading mode is set, shafts 7, 17, 28 and 7, 27 and 26 are unterlocked with the rotation of a loading motor (not shown) to turn loading arms 23 and 25 and to push out the loading blocks 51 and 52 toward the arrow A. Further, through the turning of a pinch roller cam 1d and a pinch roller transfer lever 4, the pinch roller 79 is transferred along the guide hole (not shown) as the arrow B to press-cotact a capstant 41. Thus, a cassette and a VTR main body can be made small sized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape loading mechanism for a compact video tape recorder.

A cassette-type video tape recorder is equipped with a loading mechanism that pulls out a tape stretched in a cassette and wraps it around the circumferential surface of a guide cylinder at a predetermined angle.

Currently, two methods are generally used as loading mechanisms. The first method is the β method, in which a pinch roller that enters the cassette notch is rotated along with the loading disk to load the tape. - There is a VH3 method in which the tape is mounted by moving the ding pin in two directions around the guide cylinder's outer periphery using an arm. In this case, the capstan for running the tape at a constant speed had to be inserted into a notch in the front of the cassette, making it difficult to downsize the cassette.

Therefore, in order to downsize the cassette and the loading mechanism, it is conceivable to insert a pair of loading pins and a pinch roller into the notch of the cassette so that the loading pin performs loading and the tape runs at a constant speed outside the cassette.

In view of the fact that a deep notch can be formed in the center of the front of the cassette in a small cassette, the present invention provides a pinch roller at the center of the front of the cassette, and an inclined bin on the loading block on both sides of the roller. To propose a new and effective tape loading mechanism for a small video tape recorder, which minimizes notches and is characterized by having a pinch roller face the capstan across the moving path of the loading block after the tape is pulled out. It is something.

(Margin below) Hereinafter, the present invention will be explained according to an illustrative embodiment.

The first feature of this embodiment is that it is provided with a mode setting cam that switches modes by rotation.

This mode setting cam (force is applied to the second
Set the fast forward mode and rewind mode with the tape stored in the position [Fig. 2 (a)], and then rotate the tape 270° counterclockwise from the first position to the third position [Fig. 1 (C)] ], set the pause mode upon completion of loading, and move to the fourth position, which is rotated 45 degrees counterclockwise from the third position [Figure 1 (
d)], the pinch roller is pressed to set the recording mode and reproduction mode. In addition, this mode setting cam T has an idler regulating cam (1b) formed on the upper stage of the gear part (1a), a spiral loading cam (1c) on the lower surface, and a lower idler regulating cam (1b) on the lower surface. Furthermore, a pinch roller moving cam (1d) is attached to the top surface, and the idler regulating cam (1b) is equipped with an idler regulating lever (2) for regulating the movement of the tape winding idler and a loading completion detection lever (3). The pinch roller moving cam (1d) is brought into contact with the pinch roller moving lever (1d).
4), and further the loading cam (1c)
There is a loading pin (5) that drives the loading mechanism.
are engaged. Therefore, in the stop mode, the idler regulation lever (2) is activated by the idler regulation cam (
By entering the recessed portion 1b), the brake shoe is placed in the first position, and the idler is set in the neutral position, and the brake shoe is pressed against the reel stand.

Further, in the fast forward mode and the rewind mode, the idler regulating lever (2) is disengaged from the recessed portion and is in the second position, releasing regulation of the idler. Furthermore, in the pause mode, the loading pin (5) is rotated clockwise to complete loading, and the pinch roller moving lever (4) is rotated clockwise to pinch the tape and move the pinch roller. The idler regulating lever (2) faces the capstan and is in the second position, and the loading completion is detected. The rotation of the mode setting cam (11) is stopped.In addition, the pinch roller moving lever (4) is in recording mode and playback mode.
is further rotated clockwise to press the pinch roller against the capstan.

Each drive system will be explained below with reference to the drawings from FIG. 2 onwards.

First, as shown in FIG. 2, the drive system for the mode setting cam I is connected to the first support shaft (7
), the mode setting cam (1) is rotatably supported on the gear part (1a), and the chamber board; A loading motor support plate (attached to the lower surface of the bottom board 16) is engaged with the double-sided second gear Oe fixed to the lower part of the second support shaft (8). A portion (12a) of the double-heavy gear of the third gear 02 which is pivotally supported by
The fourth gear Oa, which is integrated with the drive shaft (13a) of the loading motor stop, is meshed with the drive shaft (13a). Therefore, the loading motor α3 is connected to the fourth gear 141 and the third gear (1
The rotation is transmitted to the first gear (9) by the third gear (13 and the second gear 00, which constitute a deceleration and rotational axis changing mechanism), and the mode setting cam (1) The setting mode can be switched by the loading motor 03 which is driven in both directions.

Further, as shown in FIG. 3, the drive system of the loading mechanism includes a fan-shaped gear (IS) supporting the loading pin (5) that engages with the loading cam (1c), and a fan-shaped gear (IS) that supports the loading pin (5) that engages with the loading cam (1c). The fan-shaped gear (l!9 is interposed between the bottom board (ω)
A loosely fitting through hole (15a) is formed for the first support shaft (7) so that it can rotate with respect to the third support shaft IEil planted above, and a fifth support shaft is pivotally supported on the fourth support shaft (7). The gear (a part of the old small diameter gear (18a) meshes with the part of the large diameter gear (18b) of the fifth gear stop, the sixth gear (support) and the seventh gear (a)). , an eighth gear 211 is further meshed with the seventh gear (a), and the sixth gear (19
The left side loading arm @ is fixed to the first block 1241 which is integrally fixed to the eighth gear (21), and the right side loading arm □□□ is fixed to the second block 1241 which is integrally fixed to the eighth gear (21). ).

Therefore, while the mode setting cam (V) rotates 270° from the first position to the third position, the loading cam (1c)
gradually changes the diameter of the loading pin (5), thereby guiding the engaged loading pin (5) counterclockwise around the sixth support shaft (]61, and The gear (Is) rotates the first block @ counterclockwise and the second block (24) clockwise, and unloads the later-described loading blocks attached to each tip of the left and right loading arms 1232sJ. It guides you from the loading position to the loading position.

Note that the loading cam (1c) moves from the first position to the second position.
When rotating to the position to fast forward or rewind the tape, and when rotating from the 3rd position to the 4th position to perform recording and playback,
Both loading arms I rotate to keep the loading pin (5) in place without changing its diameter.
23 (to) is inactive. In addition, the second professional
and the 8th gear +21) are the bottom board +6
The seventh gear shaft is pivotally supported on the fifth shaft installed in the first block, and the seventh gear shaft is pivotally supported on the sixth shaft @. In order to support the lever, a cylindrical body (support) that also penetrates the bottom substrate is arranged at the center.

Further, as shown in FIG. 4, the reel drive system is connected to the bottom left side of the sub-board plate which is fixed to the lower surface of the bottom board (61) by four pillars 11-91 [301311+°C] as shown by the dashed line. The reel motor (to) is fixed to the first pulley (to) attached to the drive shaft (34a), and the lower part of the shaft (%) which is supported by passing through the bottom board and the upper board to be described later. The attached second boob IJ (first connecting bell 381 to 31) is mounted, and the rotation of the reel motor (341) is controlled by the normal rotation in the recording/playback mode, the high speed rotation in the fast forward mode, and the reverse rotation in the rewind mode. It has been switched to three stages of high-speed rotation.

Furthermore, as shown in FIG. 4, the capstan drive system includes a capstan motor (3
9) and attached to its drive shaft (39a); 401, and a flywheel 9 (42 A second connecting bell (43) is mounted on the flywheel pulley (43).
? 6 pillars (45116) (414 (48
) 14 (G) [Co., Ltd.] and is a rotation detection body that incorporates a rotation detection means for the flywheel boot 421.

The configuration of the loading mechanism, which is the second feature of this embodiment, will be explained below with reference to the drawings from FIG. 5 onwards.

First, each of the 12 double-ended arms has 2
Temporary springs (23a) (23b) and (25a) (25
b) is rotatably supported by connectors (23c) and (25c), and the overstroke during loading is prevented by these leaf springs (23a), (23b), (25a), and (2s).
It is absorbed by elastic deformation in the thickness direction (b). Also, loading blocks +51) are placed at the tips of the double-ended loading arms. 55 has a nearly symmetrical shape, and one of the right loading blocks has a right side guide shaft rotatably supported by the right side loading arm and a right side guide shaft rotatably supported by the right side loading arm. A right side movement guide joint fixed to the upper part and having a right side tape guide (goods) and a right side inclined pin eye that is inclined at about 12 degrees; a right side slider forming a guide groove (57a) on its surface; and a right side positioning arm (to) that is fixed to the lower part of the guide shaft ridge and circumferentially contacts a guide rail, which will be described later, to define the rotational state of the right side movable guide table ω. and the right slider (5
71 and the right side positioning arm (581 through holes (57c)
) (58a) and slide the right slider 157.
It consists of a right side coil spring (59I) which biases the positioning arm (581) clockwise relative to 1.Similarly, the left side rope ink flock group also has a left side guide shaft; 60 as shown in FIG. and left side slider j611 and left side tape guide;
3), and the left side moving guide stand (641) is biased to rotate counterclockwise with respect to the left side slider (61).

These loading blocks 61) 321 must pass through a narrow place from the unloading position to the loading position. Here is one example.

As shown in FIG. 6, a right guide hole (66) for guiding the right slider and a left guide hole (61) for guiding the left slider are formed on the upper board with their upper portions cut off. Forming both sliders +571
: 611 and the right guide rail (for example, left guide rail 16) outside the loading path on the bottom board as shown in FIG.
The right side positioning arm (581) and the left side positioning arm (not shown) are attached to both guide rails 1ff) f69), and during loading, the side moving guide platform mallet (the longitudinal direction of the circle is placed along the loading path 11). This also avoids collisions with components disposed close to the loading path.Also, the two moving guide stands (64) move on the upper surface of the upper substrate (64), and the two sliders (64) move on the upper surface of the upper board (64). 5η:61), and at the loading position, both the guide through holes ((G) positioning block 170 which also serves as a stopper for removing the forehead), and at m+ both the movable guide bases t% +6
The tape guide side of 11 is defined, and the inclined pin side is defined by the winding angle defining plate 2 which comes into contact so that the defined position can be adjusted by adjustment screws (72a) and (73a), and at the unloading position, both of the above-mentioned movements Guide stand (571+611
The right moving guide stand (5
71 is defined by a storage regulation fitting (741), and the left side moving guide stand (61) is defined by a storage regulation plate ff51 Z,
.

Therefore, both the movable guide stands (5η'61) are connected to the storage regulation fitting ff41 and the storage regulation plate! during unloading. 751, during loading, both guide rails +681169), and upon completion of loading, the positioning block (7 (11 near 11 and wrapping angle defining plate ('721 f73)) defines its rotational state. Ru.

Further, as shown in FIG. 7, the pinch roller moving mechanism moves the pinch roller moving lever (4) that comes into contact with the pinch roller moving cam (1d) to the seventh position on the bottom substrate +6+.
An expansion spring (2) is rotatably supported on the support shaft side, and also supports a pinch roller support lever (equipment) on the seventh support shaft stop, and is connected to the pinch roller moving lever (4). Pinch roller 69. The rotation regulating pin (4a) installed on the pinch roller moving lever (4) absorbs the overstroke during crimping of the pinch roller.
), and the L-shaped lever all fixed to the pinch roller moving lever (4) is connected to the pinch roller pressure detection switch! 8]). In addition, the pinch roller support shaft (77a) is installed in the pinch roller support lever tray.
) is formed with a pinch roller guide hole (821) across the right side of the guide hole in the -L part substrate rim to ensure a moving path for loading and pinch roller crimping. (G) (The right slider 671 must have a sufficient length so that the right slider (5?l) can stably slide along the right guide through hole 1 (5) at the intersection of 8 and 8. Therefore, as is clear from the shape of the pinch roller moving cam (1d), the pinch roller 79) of this embodiment rotates in the second half of the loading period, that is, after the tape has been sufficiently pulled out, It faces the capstan (411) and enters the pause mode, moves slightly as the recording mode or playback mode is switched, and elastically clamps the tape, and this clamping is applied to the pinch roller pressure detection switch (81). is detected, and the power to the loading motor α stage is de-energized.

Next, as is clear from FIG. 4 and FIG. 6, the back tension applying mechanism is a rotating shirt in which a back tension detection arm for planting a back tension pin (831) is inserted through the cylinder (to). (A cylindrical body (material) is fixed to 851 and a band (2) is wrapped around the lower end of the bottom board (the rotating shaft that reaches the bottom surface of 6!), The back tension applying arm (84I) is rotated counterclockwise by being indexed by an index spring (Incorporated) that fixes the back tension detecting arm. The brake plate (91
) on the supply reel stand (9).
3), the back tension applying lever (94)
1, the back tension is applied, and on the lower surface of <-1941 there is a tension release which is also pivoted on the 8th support shaft (8g) and biased to rotate counterclockwise by a tension release spring (!15). A lever (96) is arranged, and when unloading, the bending rib (96a) is used to rotate the tension applying lever counterclockwise to completely separate the brake shoe (A). With,
The first movable pin mount is rotated clockwise to hold the back tension pin in the notch of the cassette (not shown), and both loading blocks +511 and +52 are loaded. When it almost reaches the position, the second movable pin (2) set on the first block rotates the tension release lever (%) clockwise, so that the back tension applying lever (%) is released. The back tension is detected by the bias of the index spring 1 and t Ni+ ! 84) reaches the loading position (that is, the back tension detection position), and a braking force is applied to the supply reel stand ((2) by the tension of the back tension pin).

The idler mechanism then includes an idler support pivoted to the shaft on the bottom board.
An idler support lever is installed on the upper surface of this idler support lever ya, and a third movable pin a (g) is installed on the lower surface, and the idler regulating lever s -+21 is shown in FIG. As shown in the figure, when the regulation spring (101) is rotationally biased and comes into contact with the recess of the idler regulation cam (1b) and is in the stop mode, the notch (2) of the idler regulation lever (2)
2a), the third movable pin 4 engages to restrict its rotation, and the idler (+02), which is pivotally supported by the two idler shafts on the upper surface of the upper substrate, is set at the middle d' position. When the idler current control lever (2) is in another mode in which it is out of the recess of the idler regulation cam (1b) as shown in FIG. 7, the idler regulation cam (1b) is moved counterclockwise. The idler (102) can be rotated freely, and the ninth gear (103) rotates together with the shaft (the blade) and meshes with the idler (102). ), the idler gear (102) selectively meshes with a gear part (93a) of the supply reel stand +931 or a gear part (104a) of the take-up reel stand (104), The rotation of the motor (to) is controlled by the two reel stands (9).
31 or (104). Note that the reel motor □□□ switches the rotational direction in each of the winding and fast-forward modes, and decelerates the rotation in the recording and reproducing modes, and the applied voltage is switched depending on each mode.

Further, the reel braking mechanism interlocked with the idler regulation lever (2) is connected to the braking portion (105a) of the braking lever (105) disposed on the upper substrate (as shown in FIG. 6).
105b) is opposed to the circumferential surfaces of both the reel stands (104) and (!0), and the braking lever (105) is connected to a braking force applying lever (107) via a connecting plate (106). At the same time, its sliding direction is regulated by a ninth support shaft (108), and the braking force imparting lever (107) is pivotally supported by a tenth support shaft (109) and passes through the upper substrate to regulate the idler. A brake pin (110) set up on the lever (2) is loosely fitted, and the brake portions (105a) and (105b) come into pressure contact with both the reel stands; η and (104) only in the stop mode.

In addition, the device of this embodiment is provided with four detection switches as shown in FIG. a loading completion detection switch (111) that detects the completion of loading and stops the loading motor to set a temporary stop mode;
an unloading detection switch (112) that detects unloading in conjunction with the idler regulation lever (2), stops the loading motor 03, and sets a stop mode; A high-speed transfer mode detection switch (113) that detects the release of regulation of the idler (102), stops the rotation of the loading motor +13, and sets a fast forward mode or rewind mode is fixed on the upper substrate mold, respectively. Loading motor (controls the rotation and stopping of the motor).

In the loading state, the tape guide mechanism is guided by the members shown in FIG. Pin (11
5), full-width erasing head (116), the left side tape guide (□□□, facing the left side inclined pin, guide cylinder (117) inclined at 10°, when the right side inclined pin, the left side is IDOPIN (Incorporated), the audio Control signal recording/playback head (i
ia), is guided by the second fixed guide pin (119), the capstan (41) and the pinch roller f79) and reaches the cassette winding side.

In addition, the apparatus of this embodiment has a tape start end detection mechanism and a tape end detection mechanism of the same configuration on the tape supply side and the tape winding side, respectively, and the tape end detection mechanism is configured as shown in FIG. C) Supply side positioning guide (120)
is hollow in the axial direction, and a light emitting member (121) is fixed on the upper substrate (121) by a first fixing fitting (121).
122) is emitted horizontally and vertically reflected by the first reflecting member (123) disposed within the supply side positioning guide (120), and this reflected light is reflected into the supply side positioning hole of the cassette (C). A second reflecting member (124) placed at the top reflects the light in the horizontal direction penetrating the tape running section, and a light detecting member (126) is placed on the side of the cassette holder (125) on the opposite side of the tape (°C). The transparent tape at the end of the tape passes through the light detection member (1) arranged on the side of the cassette holder.
26). The figure number in Figure 9 (127
) is a holder for the light emitting member (122), and (128
) is a holder for the photodetecting member (126), (129) in FIG. 8 is a winding side positioning guide, and (130)
) indicates the second fixture.

The operation of the device of this embodiment will be explained below for each mode.

(a) Stop mode: This mode is a mode in which the cassette can be attached and detached, and when the cassette is attached, both tape guides +541 <ez, both inclined pins: 631 (551, the above The pinch roller (791 and the back tension pin theory) is in an unloading state in which it has entered the cassette notch, and the brake shoe (η is in a non-contact state) applying back tension, but the brake lever (105) is in a non-contact state. Both splitting parts (
105a) (105b) are both reel stands! 931(1)
The idler (102) is brought into pressure contact with the circumferential surface of the idler (102) to regulate the running of the tape, and the idler (102) is set at a neutral position. This unloading state is detected by the unloading detection switch (112), and when setting the stop mode from another mode, the rotation of the mode setting cam is stopped by this detection output.

(b) High-speed transport mode This mode is a mode in which the tape is stretched at the front of the cassette in an unloaded state and the tape is run at high speed. Therefore, when the mode setting cam is rotated clockwise from the first position by the mode setting operation, the tip of the idler regulation lever (2) is removed from the recessed part of the idler regulation cam (1b) and rotated by 45 degrees to reach the high speed. The rotation is stopped by the detection output of the transfer mode detection switch (143). By rotating the idler regulation lever (2), the idler (102) is released from regulation, and the rotation of the reel motor, which is driven at high speed at the same time as the mode is set, swings in one direction according to the set mode. , one reel stand is driven at high speed.

(C) Pause mode: This mode is a mode in which the tape stretched inside the cassette is pulled out, loaded, and timed for recording and playback. Therefore, @1 position/, the mode setting cam (sword) rotates 1 counterclockwise, and the loading cam (1
c) to operate the loading mechanism by guiding the loading pin (5) that engages with the idler cam (1).
b) The idler regulating cam (2) that engages with the reel table cam (2) releases the braking on both reel stands (631 (104)) and the regulation on the idler (102) to the neutral position. The pinch roller moving cam (1d) causes the pinch roller C'I91 to face the capstan (41), and in the third position rotated by 270 degrees, the rotation completion detection switch (11) is rotated by 270 degrees.
The rotation is stopped by the detection output of 1). On the other hand, the second movable pin (in other words, the second movable pin rotates counterclockwise with loading) releases the rotation restriction of the back tension applying lever (941) by the tension release lever (96), The tension detection arm (841) is rotated. Also, the tension detection arm (841) is moved along the both guide through holes 1661 and 67 as the tension detection arm (841) is rotated. Both tape guides (115), (119), etc. 1) Move the two moving guide stands 156) and the circle to the two sliders 15ηI69 without causing the two moving guide stands 15Eil:'i4) to collide with each other.
By rotating it against the guide hole, the longitudinal direction thereof is aligned with the both guide through holes, and at the loading completion position, the both positioning blocks (7α71) and the above-mentioned both winding bone provisions-1 & 172 are adjustable. ) The plate springs (23a) (23b) (25a) that constitute the loading arm
) (25b) causes loading 7 sprouts.
The tape that absorbs the bar stroke and is wound around the guide cylinder (117) which is inclined by 10 degrees to the left in the figure has its wrapping angle adjusted to the above-mentioned both inclinations which are inclined by approximately 12 degrees to the left in the figure. It is freely adjustable by pins (55) +63). In this temporary stop mode, in order to ensure a smooth start of recording and reproduction, the capstan motor (to) and head motor (not shown), which rotate simultaneously with the start of loading, continue to rotate.

(d) Recording and reproducing mode: This mode is a mode in which the tape is run at a constant speed in a loaded state. The specific operation is to bring the pinch roller 4 into pressure contact with the mode setting cam (the force is applied by the pinch roller moving cam (1d)) which rotates further counterclockwise from the third position depending on the mode setting. The pinch roller moving lever (4) is further rotated to bring the pinch roller (7ω) into pressure contact with the capstan, and the rotation is stopped at the fourth position rotated by 45 degrees based on the detection output of the pinch roller pressure contact detection switch (81). The overstroke of the pinch roller moving lever (4) is achieved by the expansion spring interposed between the pinch roller supporting lever surface and the pinch roller supporting lever surface.

On the other hand, the take-up reel stand (104) is connected to the pinch roller ff91 and the capstan by transmitting the rotation of the reel motor (to), which is driven at low speed at the same time as the mode setting, via an swingable idler (1o2). (41) winds up the tape that is transferred at a constant speed.

[Margins below] Therefore, according to the present invention, since the pair of loading means and the pinch roller are housed in the minimum space, the notch of the cassette can be minimized, making it possible to make the cassette smaller. This greatly contributes to miniaturization.

[Brief explanation of drawings]

Each figure shows a mechanism according to an embodiment of the present invention. FIG. 1 is a diagram showing the engaged state of the lever according to the rotational position of the mode setting cam, and FIG. 2 is a plan view showing the drive mechanism of the mode setting cam. figure,
Fig. 3 is a plan view showing the loading mechanism, Fig. 4 is a plan view of the lower surface of the bottom board, Fig. 5 is a partially cutaway perspective view of the right loading lock, Fig. 6 is a plan view of the upper board, and Fig. 7. 8 is a plan view of the bottom substrate in the recording/reproducing mode, FIG. 8 is a plan view of the main part of the bottom substrate in the stop mode, and FIG. 9 is a sectional view of the tape start/end detecting section. Explanation of main drawing numbers (117) 99. Guide cylinder, +5]11521
... Loading block, ■) +631 ... Inclined pin, (79) ... Pinch roller, (41) ...
Capstan. Figure 1 (a) FF / Rew (C) PAUSE (d) PLAY/RFC Figure 2 Figure 3 Figure 4 N9 34 j5
37 1 Figure 6 Figure 2 Figure 8 Figure 9 Procedure Amendment (Method) % Formula % 1. Indication of the incident 1982 Patent Application No. 150974 2. Name of the invention Kotan Video Tape Recorder Tape loading mechanism 6
Patent applicant address: 2-18 Keihan Hondori, Moriguchi City Name (188) Sanyo Electric Co., Ltd. Representative: Iue Acupuncture 4, agent address: 2-18 Keihan Hondori, Moriguchi City Contact information: Telephone (Tokyo) ) 835-1111 Patent Center Resident Kamata 5° Date of amendment order (shipment date) February 23, 1981 6. "Figure 1" of the drawing to be amended. 7,! 4Correct contentsAs shown in the attached sheet.

Claims (1)

[Claims] (1) Pull out the tape stretched inside the cassette,
In a video tape recorder in which tape is loaded in two directions around the outer circumference of a guide cylinder, a loading inclined pin installed on a pair of loading blocks and a pinch roller disposed between the inclined pins are connected to a cassette notch. a tape of a small-sized video tape recorder, characterized in that during loading, after the tilting pin moves, the pinch roller crosses one moving path of the opening and the loading block to face the capstan. Loading mechanism.