Winding of recording tape

Abstract: The invention discloses a tape rewinding device for a magnetic recording and/or reproducing apparatus. When a tape cassette 20 is loaded and recorded or reproduced, the tape 24 is loosened within the deck. The tape rewinding device automatically recovers a loosened portion of the tape 24 during the ejecting of the tape cassette 20. For achieving this purpose, a slider 40 is provided with a tape recovering means consisting of a plurality of gears 110, 120, 130, and this tape recovering means is meshed with a rack gear 100. During the ejecting of the tape cassette 20, the gears 110, 120, 130 are made to revolve by being meshed with the rack gear 100, and the rotating gear 130 rotates a supply reel 48, thereby rewinding the loosened tape 24.

Description: The present invention relates to tape winding in magnetic recording and/or reproducing apparatus. Magnetic recording and reproducing apparatuses such as video tape recorders have been developed in diversified patterns for a long time, and, at present, they can be found in most homes. That is, they are regarded as essential goods, and demand for them is still increasing. The magnetic video recording and reproducing apparatuses which are currently used at home are mostly based on VHS (Video Home System) using a 1/2-inch tape cassette. Such a magnetic recording reproducing apparatus includes: a cassette holder for receiving a tape cassette; driving members for pulling the cassette holder into the apparatus to place it on a main deck; a means for loading or unloading the magnetic tape of the tape cassette to and from a rotating drum installed on the main deck; and a means for guiding the magnetic tape along a certain path. Thus, if the tape cassette is inserted into the cassette holder, this insertion state is sensed, and the tape cassette is placed on the main deck. In this state, the magnetic tape is loaded into the fast rotating drum by pole bases, so that signals can be recorded on the magnetic tape or signals recorded on the magnetic tape can be reproduced. Recently, video cameras which utilize magnetic recording and reproducing apparatus have become compact and lightweight for the convenience of users. Conforming to this trend, video cameras using the existing 8mm tape cassette are widely known. One of the most important factors for the miniaturization and light weight of the product is the size of the deck. That is, the compactness and light weight of the product are decided, according to how much the size of the deck is reduced. Therefore, the degree of the reduction of the deck size is a measure of technical level, for which magnetic recording and reproducing apparatuses of various types based on various methods are being developed. Japanese Patent Application Laid-Open No. 61-211863 discloses a recording and reproducing apparatus which includes: a supply reel and a take-up reel; a driving board having a capstan and pinch rollers; a drum board having a rotating drum; guide means for guiding the driving board and the drum board in a sliding manner; a tape loading means for passing the tape around the rotating drum during the sliding of the driving board and the drum board; and a pinch roller accessing means for accessing the pinch roller to the capstan, thereby making the size of the deck compact and light weight. This recording and reproducing apparatus uses the 8mm tape cassette, in which the hubs of the supply reel and the take-up reel are fixed, thereby contributing to the miniaturization of the deck size to a certain degree. However, there is a limitation in reducing the size of the deck. In an attempt to reduce the deck size to a minimum and to simplify the components, the present inventors disclosed a magnetic recording and reproducing apparatus in their Korean Patent Application No. 93-5016. According to this apparatus, during the loading of the tape cassette, the hubs of the tape cassette are pivoted around certain axes, and the rotating drum is completely received into the tape cassette, thereby miniaturizing the size of the deck to the maximum degree. This apparatus will be briefly described below, with reference to Figures 1 to 2C of the accompanying diagrammatic drawings, in which: Figure 1 is a schematic side view of a conventional magnetic recording and reproducing apparatus to which embodiments of tape rewinding devices according to the present invention may be applied; Figure 2A is a schematic plan view showing a state in which a tape cassette is initially placed on a slider of the apparatus of Figure 1; Figure 2B is a schematic plan view showing a state in which the tape cassette is made to advance horizontally forward toward a rotating drum by the slider from the state of Figure 2A; and Figure 2C is a schematic plan view showing a state in which the tape cassette is made to move horizontally backward from the rotating drum by the slider from the state of Figure 2B. Referring to Figure 1, an eject lever 10 is integrally formed with a pair of backwardly extended arms 12, and the arms 12 are connected through shafts 16 to a pair of brackets 14 which are uprightly provided within the body of the apparatus (not shown). Thus, the eject lever 10 opens and closes up and down itself around the shafts 16. A locking pin 17 is provided on the front of the eject lever 10, and when performing an ejecting operation, the locking pin 17 is released so that the eject lever 10 is exposed to the outside of the apparatus at a certain angle, thereby making it possible to insert or eject a tape cassette 20 to and from the apparatus. A pin 18 is formed on a side of the arm 12 of the eject lever 10, and this pin 18 is inserted into an elongated slot 34 of a bracket 32 which is uprightly provided on a side of an upper chassis 30, so that the upper chassis 30 can move up and down vertically during pivoting of the eject lever 10 up and down. Above the upper chassis 30, there is installed a slider 40 for moving the tape cassette 20 in the horizontal direction forwardly and backwardly. A cassette holder 50 is connected through a shaft 52 to the end of the slider 40, and a projection 54 is extended by a pin 43 to be inserted into an elongated slot 41 of the slider 40. Thus, the cassette holder 50 can be pivoted around a shaft 51, so that the tape cassette 20 can be inserted or ejected. At a side of the cassette holder 50, there is installed a lid opening member 52 which pivots up and down around the shaft 51, and which is provided with an elongated slot 53 at an approximately middle portion thereof, so that a pin 54 of the cassette holder 50 can be fitted into the slot 53 to guide the member 52. The middle portion of the lid opening member 52 is connected to the slider 40 by a link 44 which is inclined at a certain angle, while the link 42 is connected with the link 44 through an elastic (or resilient) member 45. Therefore, when the cassette holder 50 is settled on the slider 40, the lid opening member 52 is pivoted around the shaft 51, so that a lid 22 of the tape cassette 20 can be opened. Meanwhile, reel bases 46 and 47 are installed on the slider 40, and reels 48 and 49 are installed on the reel bases 46 and 47, so that hubs (not shown) of the tape cassette can be guided. The slider 40 is movable forwardly and backwardly in the horizontal direction by a slider moving mechanism (not shown) which is installed on the upper chassis 30. Below the upper chassis 30, there is installed a lower chassis 60 on which respective running components for driving the magnetic tape (not shown) within the tape cassette 20 are installed. At the sides of the upper chassis 30 and the lower chassis 60, there are installed a pair of links 61 and 62 based on the principle of the Scott Russell link mechanism in a mutually crossing form, which are connected through a pair of end pins 63 to the lower chassis 60, while an elastic (or resilient) member 65 is installed to a central pin 64 of the links 61 and 62. Owing to the scissors-like movements of the links 61 and 62, the upper chassis 30 can move up and down vertically. In such a conventional magnetic recording and reproducing apparatus constituted as above, if the tape cassette 20 is inserted into the partly exposed cassette holder 50, and if the cassette holder 50 is closed by pressing it, then the cassette holder 50 pivots around the shaft 52 to be settled on the slider 40. Then, the hubs of the tape cassette 20 are guided by the reels 48 and 49 which are installed on the slider 40. The lid opening member 52 which is provided at a side of the cassette holder 50 pivots clockwise around the shaft 51, so that the lid 22 of the tape cassette 20 should be opened. Under this condition, if the slider 40 is pushed toward the upper chassis 30, then the slider moving mechanism (not shown) which is installed on the upper chassis 30 horizontally moves the slider 40 toward the upper chassis 30, thereby completing the movement of the slider 40 relative to the upper chassis 30. However, as shown in Figure 2A, if a user pushes the slider 40 toward the rotating drum 36 in a state with the tape cassette 20 settled on the slider 40, then the slider 40 moves from above the upper chassis 30 to the rotating drum 36 as described above. Under this condition, the magnetic tape 24 within the tape cassette 20 contacts the rotating drum 36, and is released from the hub 26 of the tape cassette 20, so that a state as shown in Figure 2B is maintained. Under the state of Figure 2B, if the user closes the eject lever 10 by pressing it, the locking pin 17 which is formed at the front thereof is locked to the locking member (not shown) which is formed on the lower chassis 60. During the descending of the eject lever 10, the pin 18 which is provided at one side of the eject lever 10 moves along the elongated slot 34 which is formed on the bracket 32 of the upper chassis 30, with the result that the upper chassis 30 comes down to above the lower chassis 60. At the same time, a tape loading means (not shown) loads the magnetic tape 24 to the rotating drum, thereby making it possible to carry out a reproducing operation for the magnetic tape 24. After the completion of such a reproducing operation, if the user opens up the eject lever 10 of Figure 1 from the lower chassis 60, the upper chassis 30 ascends from the lower chassis 60, such ascending being carried out by the links 61 and 62 and the elastic member 65. In the case that the upper chassis 30 rises from the lower chassis 60 by being separated, the magnetic tape 24 which has been loaded on the rotating drum 36 is automatically wound by a tape unloading means (not shown). Thus when the upper chassis 30 has completely risen from the lower chassis 60, the magnetic tape 24 is maintained in the state shown in Figure 2B. Thereafter, if the user pulls the slider to separate the upper chassis 30 with the rotating drum 36 installed thereon, the slider 40 is made to elastically move in the horizontal direction by a slider moving mechanism (not shown), with the result that the upper chassis 30 and the slider 40 are maintained in a state as shown in Figure 2A. However, in such a magnetic recording and reproducing apparatus, after the completion of the reproducing operation, in the case where the slider 40 reversely moves from the upper chassis 30 after the upper chassis 30 moves from the lower chassis 60, the magnetic tape 24 remains extended by as much as has been necessary to closely contact the rotating drum 36, as shown in Figure 2C. Therefore, during the ejecting of the tape cassette, the extended portion of the magnetic tape 24 can become entangled with the lid 22 or with the various components of the deck, thereby damaging the magnetic tape. JP-A-61 284 857 reflecting the preamble of claim 1 discloses a tape recovering means generating a rotating force by cooperation with a rack gear during unloading and for transmitting said rotating force to the reel by idler gears for recovering the loosened tape portion. FR-A-2 013 052 discloses a tape recording and/or reproducing apparatus comprising a chassis for receiving a tape cassette mounted for relative sliding movement with a main chassis during loading and unloading of a tape cassette and a spring loaded mechanism for winding up slack recording tape during unloading. Preferred embodiments of the invention aim to overcome the above described disadvantages of the conventional techniques. Therefore, one aim is to provide a tape rewinding device for a magnetic recording and reproducing apparatus, in which, when ejecting a tape cassette from the deck, an already extended tape portion is automatically wound to a reel or hub of the cassette, thereby preventing damage to the magnetic tape. According to one aspect of the present invention, there is provided a tape rewinding device for a magnetic recording and/or reproducing apparatus which includes: a main chassis with a rotating drum installed thereon; a pair of reels for installing a tape cassette; and a sub-chassis for sliding over said main chassis toward and away from said rotating drum for loading or unloading said tape cassette, said tape rewinding device comprising: a rack gear installed on said main chassis; and a tape recovering means comprising a gear system for transmitting rotating force by co-operation with said rack gear to one of the reels during the unloading of said tape cassette, characterised in that said gear system is movable from a non-meshed position to a meshed position during the ejecting of said tape cassette. Preferably, said tape recovering means consists of idler gears meshed with said rack gear, and the shaft of a said idler gear is installed on said sub-chassis. Preferably, said tape recovering means comprises: a first gear rotatably installed on said sub-chassis, and meshed with said rack gear; a second gear meshed with said first gear; a third gear meshed with said second gear, and meshed with said reel during the sliding of said sub-chassis for unloading said tape cassette, so as to wind the loosened tape portion onto said reel by rotating said reel; and a pivoting member with one end thereof secured to the shaft of said first gear, so that said first, second and third gears are sequentially meshed. Preferably, said tape recovering means further comprises a slip member installed between said third gear and a separate gear to absorb rotating power from said third gear. Suitably, said device includes: a transmitting gear connected to one of said reels to transmit a rotating force; and a tape recovering means installed on said sub-chassis to generate a rotating force by being meshed with said rack gear for the purpose of transmitting said rotating force to said transmitting gear during the unloading of said tape cassette by the movement of said sub-chassis, thereby driving said reel to recover a tape portion loosely loaded on said rotating drum. Preferably, said tape recovering means comprises: an idler gear for being meshed with said rack gear via another idler gear; and an idler position regulating means for regulating the position of said idler gear upon completion of the loading of said tape cassette by said sub-chassis to release the contact of said idler gear with said transmitting gear. Preferably, said tape recovering means comprises: said transmitting gear installed on a reel base, and for being meshed with said reel; a first idler gear for being meshed with said transmitting gear to forwardly or backwardly rotate said transmitting gear during the loading or unloading of said tape cassette by said sub-chassis, and for not being meshed with said transmitting gear upon completion of the loading of said tape cassette; and a second idler gear for being meshed with said rack gear, and for being meshed with said first idler gear by a pivoting member to rotate said first idler gear. Preferably, said first idler gear is regulated by said idler position regulating means in such a manner that said first idler gear is meshed with said transmitting gear only during the loading or unloading of the tape cassette by said sub-chassis, and the mesh of said first idler gear with said transmitting gear is released only upon completion of the loading of said tape cassette by said sub-chassis. The invention extends to a tape recording and/or reproducing apparatus provided with a tape rewinding device according to the preceding aspect of the invention. Suitably, the tape is located in a tape cassette, and the apparatus comprises: a main chassis; and a sub-chassis for receiving a tape cassette, and being mounted for relative sliding movement with respect to the main chassis during loading and unloading of a tape cassette. Suitably, the apparatus is a video camera. For a better understanding of the invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to Figures 3 to 6 of the accompanying diagrammatic drawings, in which: Figure 3A is a schematic plan view of a magnetic recording and reproducing apparatus having a tape rewinding device according to a firm embodiment of the present invention, in which a slider is settled on an upper chassis initially; Figure 3B is a schematic plan view of a tape recovering means showing a state in which the slider is moved horizontally forwardly toward a rotating drum from the state of Figure 3A; Figure 4 is a sectional view of the tape recovering means taken along the line IV-IV of Figure 3A; Figure 5A is a schematic plan view of a magnetic recording and reproducing apparatus using a tape rewinding device according to a second embodiment of the present invention, in which a slider is settled on an upper chassis initially; Figure 5B is a schematic plan view of a tape recovering means showing a state in which the slider is moved horizontally forwardly toward a rotating drum from the state of Figure 5A; Figure 5C is a schematic plan view of the tape recovering means showing a state in which the slider is moved horizontally backwardly from the rotating drum from the state of Figure 5B; and Figure 6 is a sectional view of the tape recovering means taken along the line VI-VI of Figure 5A. In the figures, like reference numerals denote like or corresponding parts. Figures 3A and 3B are schematic plan views of part of a video tape cassette recorder in which the illustrated example of a tape rewinding device embodying the present invention is applicable, and showing a condition in which a slider 40 moves over an upper chassis 30. In these drawings, only the necessarily required components are shown in solid lines, and are for illustrating examples of technical details in a clear form, and are not for limiting the scope of the present invention. Referring to Figure 3A, a rotating drum 36 is installed on the upper chassis 30, while a supply reel 48 and a take-up reel 49 are installed on the horizontally movable slider 40. The supply reel 48 is provided with a gear 48a on a lower portion thereof, and the gear 48a is selectively meshed with a below-mentioned gear of the tape recovering means, so that a magnetic tape 24 loosened by the rotating drum 36 can be recovered. The slider 40 advances forwardly towards the rotating drum 36 of the upper chassis 30 by a moving mechanism (not shown). Then the slider 40 is coupled with the upper chassis 30 at the position of Figure 3B, i.e. at a first position where the magnetic tape 24 is loosened by the rotating drum 36 by a certain length. Subsequently, during the ejecting of a tape cassette 20, the slider 40 backs away from the first position to a second position by a moving mechanism (not shown), at which the tape cassette 20 can be ejected, i.e. to the position of Figure 3A. Accordingly, the slider 40 moves from the second position to the first position during the loading of the cassette, while the slider 40 moves from the first position to the second position during the unloading of the cassette. The tape recovering means is pivotally installed under the slider 40 in such a manner that, in a state with the magnetic tape 24 contacting the rotating drum 36 as shown in Figure 3B, when the tape cassette 20 is unloaded by being withdrawn as shown in Figure 3A, the supply reel 48 is rotated counterclockwise, thereby recovering the tape 24 loosened by the rotating drum 36. This tape recovering means is guided by being meshed with a rack 100 fixed on the upper chassis 30. This tape recovering means includes a gear 110 fixed in such a manner that one end of its shaft 110a is rotatably secured, while the gear 110 revolves by being meshed with the rack 100. Further, the tape recovering means includes a gear 120 meshed with the gear 110, and a gear 130. The gear 130 is meshed with the gear 120, and, when the slider 40 moves from the first position to the second position, the gear 130 is meshed with the gear 48a of the supply reel 48. Thus the supply wheel 48 is rotated counterclockwise, so that the loosened magnetic tape 24 should be wound on the supply reel hub of the tape cassette by the supply wheel 48. The shafts of the gears 110, 120 and 130 are connected to a pivoting member 140, and thus, the gears 110, 120 and 130 can pivot around the shaft 110a of the gear 110. One end of the pivoting member 140 is firmly secured on the shaft 110a of the gear 110, and therefore, the pivoting member 140 can pivot around the shaft 110a during the revolution of the gear 110. As shown in Figure 4 in a sectional view, the gears 110, 120 and 130 and the pivoting member 140 are all positioned under the slider 40. The gear 110 is meshed with the rack 100 all the time, and, when the slider 40 advances horizontally forwardly toward the rotating drum 36, the gear 130 is not meshed with the gear 48a of the supply reel 48 as described hereinafter. However, when the slider 40 moves horizontally backwardly from the rotating drum 36, the gear 130 is meshed with the gear 48a of the supply reel 48 to rotate the supply reel 48 counterclockwise. Meanwhile, the amount of the tape wound on the tape supply hub (not shown by reference symbol) is not always constant, and therefore, the radius of the remaining tape roll is not constant. Accordingly, if the remaining tape roll is at a maximum, the recovered tape amount tends to be larger, and therefore, the tape may be subjected to a forced tension to extend the tape. Therefore, as shown in Figure 4, a separate gear 150 is installed beside the gear 130, and a felt 160 as a slip generating means is installed between the gears 130 and 150, so that the rotating power from the gear 130 should be absorbed, and a proper torque should be maintained on the gear 150 all the time. The first embodiment as described above will now be further described as to its operation. First, as shown in Figure 3A, the user pushes the slider 40 toward the rotating drum 36, in a state with the tape cassette 20 placed on the slider 40. Then, the slider 40 advances toward the rotating drum 36 by the action of the relevant moving mechanism. When the slider 40 advances toward the rotating drum 36, the gear 110 rotatably installed on the shaft 110a below the slider 40 is meshed with the rack 100 fixedly installed on the upper chassis 30, so that the gear 110 should revolve counterclockwise. When the gear 110 revolves counterclockwise together with the movement of the slider 40, the pivoting member 140 having one end secured to the gear shaft 110a is pivoted with the gears 120 and 130. In other words, when the gear 110 revolves counterclockwise, the pivoting member 140 is also pivoted counterclockwise. Then the gears 120 and 130, of which the shafts are rotatably secured on the pivoting member 140, are also rotated in such a manner that the gear 120 revolves clockwise in mesh with the gear 110 and the gear 130 revolves counterclockwise in mesh with the gear 120. Thus, when the slider 40 moves toward the rotating drum 36, the rack 100 fixedly secured on the upper chassis 30 is meshed with the gear 110 rotatably installed under the slider 40, so that the gear 110 should revolve counterclockwise. Accordingly, the pivoting member 140 pivots counterclockwise, so that the gear 130 should not contact the supply reel 48. When the slider 40 moves from the second position of Figure 3A to the first position of Figure 3B, the tape recovering means does not contact the supply reel 48 at all. If the slider 40 moves slightly more toward the upper chassis 30, the tape hub properly responds to the tape force generated when the tape 24 is wound on the rotating drum 36. Thus the tape hub revolves counterclockwise in an automatically loosening direction. Therefore, when the slider 40 completes its horizontal movement relative to the upper chassis 30 to the first position, the loading means (not shown) is activated, so that the tape 24 can be wound around the rotating drum 36 and that the recording or reproducing of the tape can be carried out. When the recording or reproducing is completed, the loading means unloads the portion of the magnetic tape 24 which has been wound on the rotating drum 36, and the state of Figure 3B is maintained. In this state, if the tape cassette 20 is to be ejected, the slider 40 is horizontally withdrawn from the upper chassis 30 by the moving mechanism (not shown). If the slider 40 withdraws from the state of Figure 3B, the gear 110 installed under the slider 40 is meshed with the rack 100, and revolves clockwise. When the gear 110 revolves clockwise, the pivoting member 140 having one end secured on the gear shaft 110a pivots clockwise. When the slider 40 withdraws slightly more from the first position to the second position, the gear 130 rotatably secured to the other end of the pivoting member 140 is meshed with the supply reel 48 as shown in Figure 3A. Under this condition, when the gear 110 revolves clockwise, the gear 130 also revolves clockwise, and therefore, the supply reel 48 revolves counterclockwise. The hub of the tape cassette 20 is coupled with the supply reel 48, and therefore, when the tape cassette 20 is positioned as in Figure 3B, the magnetic tape 24 which has been loosened by the rotating drum 36 is wound again to the hub of the tape cassette 20 in accordance with the revolution of the supply reel 48. Meanwhile, the length of the tape amount wound on the tape cassette 20 is not always constant, and therefore, the radius of the tape roll wound on the hub is not also constant. Accordingly, the length of the tape recovered in one revolution is not constant, and therefore, the combination of the teeth of the gears of the tape recovering means should be able to sufficiently recover the loosened tape, taking into account the worst condition. If the magnetic tape 24 is wound to a maximum amount on the hub, the tape tends to be recovered too much, and therefore, the tape is liable to receive tension damage. Therefore, the separate gear 150 is installed coaxially with the gear 130 of the recovering means, and the felt 160 is installed between the gears 130 and 150. Thus the rotating power of the gear 130 is properly absorbed, and a proper torque is maintained on the gear 150 all the time, thereby making it possible to rotate the cassette hub as much as is required. As described above, in the tape rewinding device according to the first embodiment of the present invention, the amount of the tape which is loosened by the rotating drum during the loading of the tape is recovered during the ejecting of the tape cassette, so that the entanglement of the tape to the lid or to the deck can be prevented, thereby preventing damage to the tape. Figures 5A to 5C illustrate a second embodiment of the present invention. The tape rewinding device according to the second embodiment is applicable to the tape recorder of Figure 1. Referring to Figures 5A to 5C, the necessarily required components are illustrated in solid lines. As can be seen in the drawings, a supply reel base 46 and a take-up reel base 47 are installed under the slider 40. On the bases, there are rotatably installed reel gears 48a and 49a, so that the reel gears 48a and 49a should revolve when the reel bases 46 and 47 revolve. The reel bases 46 and 47 receive forces from a spring 270 to be elastically pivoted (or resiliently biased) in a direction opposite to that of the arrow marked A. That is, the reel bases 46 and 47 are provided with pins 46a and 47a. When the pins 46a and 47a pivot along elongated slots 40a and 40b, the reel bases 46 and 47 are spread around shafts 46b and 47b on the slider 40. Meanwhile, at the other end of the reel base 46, there are installed gears 202 and 204 and a pivoting arm 208, and the gear 204 is selectively meshed with a gear 206. Shafts 202a and 204a of the gears 202 and 204 are secured by the pivoting arm 208, and the gear 204 is installed movably along an elongated slot 46d which is formed on an end portion of the reel base 46 (Figure 5B). The gear 206 is rotatably secured to a shaft 206a on the reel base 46, and the gear 206 is for rotatably connecting the reel gear 48a to the gear 204. As shown in Figures 5A to 5C, a rack 200 which is meshed with the gear 202 is fixedly-installed on the upper chassis 30. When the slider 40 horizontally moves over the upper chassis 30, the rack 200 is meshed with the gear 202, so that the reel gear 48a can be selectively rotated forwardly or reversely. Further, stoppers 30a and 30b are installed on the upper chassis 30, and these stoppers are contacted with protuberances 46c and 47c of the reel bases 46 and 47, when the slider 40 horizontally moves toward the upper chassis 30 (Figure 5B). Figure 6 is a sectional view of the tape recovering means taken along the line VI-VI of Figure 5A. As can be seen in Figure 6, the supply reel 48 is rotatably secured through a shaft 400 to the reel base 46. Further, the gears 202, 204 and 206 are meshed to each other, and these gears and the reel base 46 are installed under the slider 40. The second embodiment of the present invention constituted as above will now be described as to its operations. Figure 5A illustrates a state in which the tape cassette 20 of Figure 1 is in a position just before moving toward the upper chassis 30 after being loaded on the cassette holder 50 and being settled on the slider 40 (Figure 2). Here, the tape cassette is not shown for the clarity of illustration. Thus, as shown in Figure 2A, if the user pushes the slider 40 toward the rotating drum 36 in a state with the tape cassette loaded, a moving mechanism (not shown) horizontally moves the slider 40 toward the rotating drum 36. Under this condition, the gear 202 is meshed with the rack 200 to revolve counterclockwise. Under this condition, the gear 204 revolves clockwise, and the gear 204 and the gear 206 are not meshed with each other. During the horizontal advancement of the slider 40, the tape is released by the rotating drum 36 which is installed on the upper chassis 30. When the advancement of the slider 40 is completed, and when the state of Figure 5B is reached, the protuberances 46c and 47c of the reel bases 46 and 47 are engaged with the stoppers 30a and 30b of the upper chassis 30. Consequently, due to the advancing force of the slider 40, the reel bases 46 and 47 are pivoted around the shafts 46b and 47b in the direction of the arrow marked A. During such a pivoting operation, the gear 204 is positioned at the left side of the elongated slot 46d of the reel base 46 (Figure 5B), and therefore, the gear 204 and the gear 206 cannot be meshed together and cannot interfere with each other. In this state, if the user pushes down the eject lever 10 (Figure 1), the upper chassis 30 is settled on the lower chassis 60. Then loading means (not shown) is activated to load the tape onto the rotating drum 36, thereby making it possible to carry out a recording or reproducing operation. After the completion of the recording or reproduction, if the user releases the eject lever 10 from the lower chassis 60, the upper chassis 30 rises from the lower chassis 60 by the links 61 and 62 and the elastic member 65. In this case, the tape loading means is activated to unload the tape from the rotating drum, thereby maintaining the state of Figure 5B. In other words, when the upper chassis 30 rises completely from the lower chassis 60, the upper chassis 30 and the slider 40 are maintained in the state of Figure 5B. In this state, if the slider 40 moves backwardly from the upper chassis 30, the protuberance 46c of the reel base 46 which has been engaged with the stopper 30a is released therefrom. Under this condition, the reel bases 46 and 47 are moved by the elastic force of the spring 270 in the direction opposite to that of the arrow marked A of Figure 5A. Therefore, the gears 204 and 206 are contacted together again as shown in Figure 5B, and this time, the gears 202, 204 and 206 revolve in the directions opposite to that as above, with the result that the reel gear 48a revolves counterclockwise. When the reel gear 48a revolves counterclockwise, the tape 24 which has been loosened as shown in Figure 2C is rewound on the hub, thereby restoring the tight state. In other words, the magnetic tape which has been loosened during the backward movement of the slider 40 from the state of Figure 5C to the state of Figure 5A is rewound on the hub, thereby recovering the loosened portion of the tape. According to the second embodiment of the present invention, the tape cassette is provided with hubs which can be pivoted toward the opposite directions, and, during the ejecting of the tape cassette after carrying out a recording or reproduction, the loosened tape can be restored to a tight state. According to the above described embodiments of the present invention, the tape which has been loosened during the loading of the tape cassette can be recovered during the unloading of the tape cassette, thereby preventing damage to the tape. Although examples of the present invention are described based on the accompanying drawings, those skilled in the art will understand that many kinds of modifications and additions can be made without departing from the scope of the present invention. For example, the tape rewinding device can be installed on a take-up reel instead of a supply reel.

Claims: A tape rewinding device for a magnetic recording and/or reproducing apparatus which includes: a main chassis (30) with a rotating drum (36) installed thereon; a pair of reels (48, 49) for installing a tape cassette (20); and a sub-chassis (40) for sliding over said main chassis (30) toward and away from said rotating drum (36) for loading or unloading said tape cassette (20), said tape rewinding device comprising: a rack gear (100) installed on said main chassis (30); and a tape recovering means comprising a gear system (110,120,130) for transmitting a rotating force by co-operation with said rack gear to one of the reels during the unloading of said tape cassette, characterised in that said gear system is moveable from a non-meshed position to a meshed position during the ejecting of said tape cassette. A tape rewinding device as claimed in claim 1, wherein said tape recovering means consists of idler gears (110, 120, 130) meshed with said rack gear (100), and the shaft (110a) of a said idler gear (110) is installed on said sub-chassis (40). A tape rewinding device as claimed in claim 2, wherein said tape recovering means comprises: a first gear (110) rotatably installed on said sub-chassis (40), and meshed with said rack gear (100); a second gear (120) meshed with said first gear (110); a third gear (130) meshed with said second gear (120), and meshed with said reel (48) during the sliding of said sub-chassis (40) for unloading said tape cassette (20), so as to wind the loosened tape portion (24) onto said reel (48) by rotating said reel (48); and a pivoting member (140) with one end thereof secured to the shaft (110a) of said first gear (110), so that said first, second and third gears (110, 120, 130) are sequentially meshed. A tape rewinding device as claimed in claim 3, wherein said tape recovering means further comprises a slip member (160) installed between said third gear (130) and a separate gear (150) to absorb rotating power from said third gear (130). A tape rewinding device as claimed in claim 1, which device includes: a transmitting gear (206) connected to one of said reels (48) to transmit a rotating force; and a tape recovering means installed on said sub-chassis (40) to generate a rotating force by being meshed with said rack gear (200) for the purpose of transmitting said rotating force to said transmitting gear (206) during the unloading of said tape cassette (20) by the movement of said sub-chassis (30), thereby driving said reel (48) to recover a tape portion loosely loaded on said rotating drum (36). A tape rewinding device as claimed in claim 5, wherein said tape recovering means comprises: an idler gear (204) for being meshed with said rack gear (200) via another idler gear (202); and an idler position regulating means for regulating the position of said idler gear (204) upon completion of the loading of said tape cassette (20) by said sub-chassis (40) to release the contact of said idler gear (204) with said transmitting gear (206). A tape rewinding device as claimed in claim 6, wherein said tape recovering means comprises: said transmitting gear (206) installed on a reel base (46), and for being meshed with said reel (48); a first idler gear (204) for being meshed with said transmitting gear (206) to forwardly or backwardly rotate said transmitting gear (206) during the loading or unloading of said tape cassette (20) by said sub-chassis (40), and for not being meshed with said transmitting gear (206) upon completion of the loading of said tape cassette (20); and a second idler gear (202) for being meshed with said rack gear (200), and for being meshed with said first idler gear (204) by a pivoting member (208) to rotate said first idler gear (204). A tape rewinding device as claimed in claim 7, wherein said first idler gear (204) is regulated by said idler position regulating means in such a manner that said first idler gear (204) is meshed with said transmitting gear (206) only during the loading or unloading of the tape cassette by said sub-chassis (40), and the mesh of said first idler gear (204) with said transmitting gear (206) is released only upon completion of the loading of said tape cassette (20) by said sub-chassis (40). A tape recording and/or reproducing apparatus provided with a tape rewinding device according to any of the preceding claims. A tape recording and/or reproducing apparatus according to claim 9, in which the tape is located in a tape cassette (20), and the apparatus comprises: a main chassis (30); and a sub-chassis (40) for receiving a tape cassette (20), and being mounted for relative sliding movement with respect to the main chassis (30) during loading and unloading of a tape cassette (20). A tape recording and/or reproducing apparatus according to claim 9 or claim 10 in which the apparatus is a video camera.

Inventors: CHO YOUNG-HO, CHOI DO-YOUNG, PARK GUN-CHOON, CHO, YOUNG-HO, CHOI, DO-YOUNG, PARK, GUN-CHOON
Applicants: SAMSUNG ELECTRONICS CO LTD, SAMSUNG ELECTRONICS CO., LTD.
Application year: 1993
Main classification: G11B15
IPC codes: G11B15