A CASSETTE REEL HAVING AN INDICATOR FOR TAPE VOLUME WITH AN UPPER FLANGE

Abstract: A cassette reel for use with a video cassette having an upper flange 93) formed of a transparent plate and a plurality of tape amount indicators (20-22), each of the indicators (20-22) being formed of a plurality of crimped portions provided on the outer surface of the upper flange in the diametrical direction thereof, wherein the innermost crimped portions (20a, 21a, 22a) of the plurality of indicators are higher than the remaining crimped portions, so that when the cassette reels are stacked up and transported for the assembly, the transparent portion of the cassette reel can be protected from being damaged and the commercial value of the cassette reel can be increased without being awkwardly designed.

Description: The present invention relates generally to a cassette reel suitable for use with, for example, a video cassette. More particularly, the invention relates to a cassette reel having on its upper flange an indicator of the amount of tape on it. So far there have been proposed various tape cassette reel for use with a video cassette. Figs 1 and 2 illustrate an example of the conventional tape cassette reel. Fig 1 is a perspective view of the cassette reel and fig 2 is a cross-sectional view taken along a line II-II in fig 1. Referring to figs 1 and 2, there is shown a tape cassette reel 13 that comprises a hub 1 integrally moulded with a lower flange 2 and an upper flange 3 fixed to the upper end face of the hub 1. The upper flange 3 is formed of a transparent plastic plate and has projections 5, ...5 protruding downwards from a stepped portion 4 of the lower surface thereof as shown in fig 2. Thus, when these projections 5, ...5 are welded on an upper end face 6 of the hub 1 as by an ultrasonic welding process, the upper flange 3 is fixed to the upper end face 6 of the hub 1. The upper flange 3 forms on its upper surface a concave portion 7 in correspondence with the hub 1. The circular concave portion 7 forms at its centre an opening portion 8. A centre pin 9, which forms a contact portion with a cassette-reel-pressing spring provided on a video cassette housing, is loosely held between the central lower surface of the upper flange 3 and the central upper end face of the hub 1. The hub 1 is provided on its lower surface with a hub drive shaft engaging opening 10 that is engaged with a hub drive shaft (not shown) provided on the main body of the video tape recorder. Also, the hub 1 is provided around its peripheral surface with a clamp piece engaging portion 11. This clamp piece engaging portion 11 serves to fix the end of the video tape to be wound on the reel, in cooperation with a clamp piece (not shown). Around its outer peripheral surface of the lower flange 2 there is formed a gear portion 12 that engages with a reel brake (not shown). Further there are provided indicators 18 and 19 on the upper surface of the transparent flange 3 by which the user can check the amount of tape on the reel. The indicator 18 is formed of a plurality of wrinkled or crimped portions, for example, five crimped portions 18a, 18b, 18c, 18d and 18e aligned in the diametrical direction of the upper flange 3. The indicator 19 is formed of five crimped portions 19a, 19b, 19c, 19d and 19e similarly arranged on the upper surface of the upper transparent flange 3. Fig 3 shows an example of a video cassette having two such cassette reels 13, 13 accommodated therein. In this embodiment, as shown in fig 3, this video cassette comprises a housing 14, and the housing 14 has on its upper surface a window 15 made of transparent plastics. Through this transparent window 15, the user can check the relative amounts of tape 16 on the cassette reels 13, 13. In other words, the transparent window 15 enables the user to check the consumed and/or remaining amount of tape 16. There are provided the above mentioned cassette reel pressing springs 7, 17 which hold the cassette reels 13, 13 respectively. Incidentally, a plurality of cassette reels 13 are usually stacked up and transported when the cassette reels 13 are assembled into the video cassette. At that time, the lower flange 2 of another cassette reel 13 collides with the transparent upper flange 3 of one cassette reel 13 so that the transparent portion of the upper flange 3 of the latter cassette reel 13 is damaged by the lower flange 2 of the former cassette reel 13. In order to protect the transparent portion of the upper flange of the cassette reel from being damaged when the cassette reels are stacked and transported for assembly, a cassette reel is proposed to have projections formed on the outer surface of the upper flange and protruding outwardly (see Japanese laid open utility model application No 55-144681). In the thus proposed cassette reel having the projections formed on the outer surface of the upper flange, these projections are fully exposed to view through the transparent window of the video cassette. Also, these projections are designed awkwardly and the appearance of the video cassette is rendered unattractive, thus degrading the value of the video cassette as a product. Accordingly, it is an object of this invention to provide an improved cassette reel in which a transparent portion of an upper flange of the cassette reel can be protected from being damaged even when the cassette reels are stacked up and transported for assembly. According to the present invention, there is provided a cassette reel comprising: a) a hub; b) a lower flange integrally moulded with said hub; c) an upper flange formed of a transparent plate; and d) a plurality of indicators for indicating the amount of tape on the reel; said cassette reel being characterised in that each of said indicators is formed of a plurality of raised portions on the outer surface of said upper flange in the radial direction thereof and the innermost such portions of said indicators are higher than other such portions. These and other features and advantages of the present invention will become apparent from the following description of illustrative embodiment thereof, to be taken in conjunction with the accompanying drawings, throughout which like reference numerals represent the same or similar parts. In the drawings:- Fig 1 is a perspective view illustrating an example of a conventional cassette reel; Fig 2 is a cross sectional side view taken along a line II-II in fig 1; Fig 3 is a perspective view illustrating an example of a video cassette; Fig 4 is a perspective view illustrating an embodiment of a cassette reel according to the present invention; Fig 5 is a cross sectional side view taken along a line V-V in fig 4; and Fig 6 is a cross sectional view used to explain the state that the cassette reels of this invention are stacked up for assembly. Now, an embodiment of a cassette reel according to the present invention will hereinafter be described in detail with reference to figs 4 to 6. In figs 4 to 6, like parts corresponding to those of figs 1 and 2 are marked with the same reference numerals and therefore need not be described in detail. In this embodiment, as shown in figs 4 and 5, the lower flange 2 is integrally moulded with the hub 1 and the upper flange 3 made of a transparent plastic plate is fixed to the upper end face of the hub 1, similarly to figs 1 and 2. In this case, the upper flange 3 is fixed to the upper end face 6 of the hub 1 by welding the projections 5, ...5 formed on the stepped portion 4 of the lower surface thereof by the ultrasonic welding process. According to this embodiment, on its outer surface of the transparent upper flange 3, there are formed three sets wrinkled or crimped indicators 20, 21 and 22 which are disposed at an angular spacing of 120° between adjacent sets the individual indicators of each set being disposed along a radius of the upper flange 3. These indicators 20, 21 and 22 are used to check the tape volume and are respectively formed of seven crimped portions 20a, 20b, ...20g; 21a, 21b, ...21g; and 22a, 22b, ...22g of the same predetermined shape aligned in the diametrical direction of the circular upper flange 3. In this embodiment, the innermost crimped portions 20a, 21a and 22a of three indicators 20, 21 and 22 are raised so as to be higher than the transparent portion of the upper flange 3 by the height ranging of from 0.1 mm to 0.5 mm. While, other crimped portions 20b, 20c, ...20g; 21b, 21c, ...21g; and 22b, 22c, ...22g are raised so as to be higher than the transparent portion of the upper flange 3 by very much less, eg, substantially 20 micrometers similarly to the known crimped portions. Other portions of the cassette reel of this invention are formed the same as those of the conventional cassette reel shown in figs 1 and 2. The cassette reels 13 of this invention are also assembled into the video cassette as shown in fig 3. Since the innermost crimped portions 20a, 21a and 22a of the three indicators 20, 21 and 22 are higher than other crimped portions 20b, 20c, ...20g; 21b, 21c, ...21g; and 22b, 22c, ...22g as described above, upon the transportation of the cassette reels for assembly as shown in fig 6, a plurality of the cassette reels 13 can be stacked up without trouble. In other words, when these cassette reels 13 are stacked up, only the innermost crimped portions 20a, 21a and 22a of the indicators 20, 21 and 22 collide with the lower flange 2 of another cassette reel 13 and the transparent portion of the upper flange 3 is prohibited from contacting with the lower flange 2. Thus, the transparent portion of the upper flange 3 can be protected from being damaged. Further, since the innermost crimped portions 20a, 21a and 22a function as the indicators 20, 21 and 22, the amount of the tape 16 wrapped around the cassette reels 13, 13 can be checked through the transparent window 15 of the video cassette. Also, these crimped portions of the present invention are not awkwardly designed, so that they do not detract from the appearance of the video cassette, and thus they increase its commercial value. While three indicators 20, 21 and 22 are formed on the upper flange 3 as described above, the number of the indicators is not limited to three but may be two, or four or more. They should be such as to maintain the upper surface of the flange 3 in spaced parallel relation to the reel on top when a number of reels are stacked. According to the present invention, as set forth above, even when the cassette reels 13 are stacked up and transported for the assembly of the cassette reel, the transparent portion of the upper flange 3 of the cassette reel 13 can be protected from being damaged.

Claims: A cassette reel comprising: a) a hub (1); b) a lower flange (2) integrally moulded with said hub; c) an upper flange (3) formed of a transparent plate; and d) a plurality of indicators (20-22) for indicating the amount of tape on the reel; said cassette reel being characterised in that each of said indicators (20-22) is formed of a plurality of raised portions on the outer surface of said upper flange in the radial direction thereof and the innermost such portions (20a, 21a, 22a) of said indicators are higher than other such portions. A cassette reel according to claim 1, in which the height of said innermost portions from the plane of the upper surface of said upper flange (3) is in a range of from 0.1 mm to 0.5 mm. A tape cassette reel according to claim 2, in which the height of the other such portions from the plane of said upper flange (3) is selected to be about 20 micrometers. A cassette reel according to any one of the preceding claims in which the number of said plurality of indicators is at least three. A cassette reel according to anyone of the preceding claims in which the number of said plurality of indicator portions in each of said indicators (20, 1, 22) is seven. A tape cassette comprising a housing having a transparent upper window portion, a pair of tape reels each according to any one of the preceding claims rotatably mounted in the housing with their indicators (20-22) visible through the window portion and a tape wound on the reels and extending therebetween.

Inventors: OZAWA, KAZUO, TATENO, SHIGERU
Applicants: SONY CORPORATION
Application year: 1988
Main classification: G11B23
IPC codes: G11B23