In Brief:

On this site you will find pictures and information about some of the electronic, electrical, electrotechnical and mecanichal technology relics that the Frank Sharp Private museum has accumulated over the years .
There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.

Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.


Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Tele Video Rama Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.

There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.

The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.
OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.

HOW TO USE THIS SITE:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the right blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. It starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, reaching the bottom end of each page then click on the Older Post button.


- If you come here at the main page from a bookmark you can visit all the site scrolling the right blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.


- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

Have big FUN ! !


©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of
Engineer Frank Sharp. NOTHING HERE IS FOR SALE !

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Saturday, September 10, 2011

PANASONIC NV-V8000 CHASSIS DECK INTERNAL VIEW.















































































































































































PANASONIC  NV-V8000  CHASSIS DECK Tape cassette loading system:


A tape cassette loading system of a video tape recorder comprises a cassette loading mechanism including a cassette tray adapted to accept a standard size tape cassette and a compact size tape cassette, for transporting a tape cassette placed thereon from a eject state located substantially outside of a body of the video tape recorder for placement or removal of the tape cassette horizontally to a closed state in which the tape cassette is completely inside the body of the video tape recorder, then to a compact cassette loading state immediately below the closed state, and then to a standard cassette loading state further below the compact cassette loading state, wherein a reel drive mechanism is movable responsive to the type of the tape cassette on the cassette loading means between a first state and a second state for driving a take up reel and a supply reel of the tape cassette, a tape loading mechanism is movable responsive to the type of the tape cassette on the cassette loading mechanism between a first state for engagement with the standard size tape cassette and a second state for engagement with the compact size tape cassette, for drawing out a magnetic tape from the tape cassette and for loading the magnetic tape on a guide drum of the video tape recorder, and a controller is used for controlling the state of the cassette loading mechanism, reel drive mechanism and the tape loading mechanism responsive to the type of the tape cassette to be loaded. 
 
 1. A tape cassette loading system of a magnetic recording and reproducing apparatus for loading and unloading a magnetic tape contained in a tape cassette on and from a guide drum of the magnetic recording and reproducing apparatus carrying magnetic heads comprising: cassette loading means adapted for holding a first tape cassette having a first size and further adapted for holding a second tape cassette having a second size smaller than said first size, said cassette loading means assuming successively a first state in which the tape cassette held on the cassette loading means is located substantially outside of a body of the magnetic recording and reproducing apparatus, a second state in which the tape cassette held on the cassette loading means is located fully inside the body of the magnetic recording and reproducing apparatus at a level substantially the same as the level of the tape cassette in said first state of the cassette loading means, a third state immediately below the second state in which the magnetic tape in the second tape cassette is ready for loading on the guide drum, and a fourth state further below said third state in which the magnetic tape in the first tape cassette is ready for loading on the guide drum of the apparatus;
first driving means driven by a motor and which is movable between first, second, third and fourth positions for driving said cassette loading means between said first state and said second state, between said second state and said third state and between said third state and said fourth state, said first position, second position, third position and fourth position of said first driving means respectively corresponding to said first state, second state, third state and fourth state of said cassette loading means;
reel drive means carrying a first reel disk for driving a supply reel of the first or second tape cassette held on the cassette loading means, a second reel disk for driving a take up reel of the first tape cassette, and a third reel disk for driving a take up reel of the second tape cassette held on the cassette loading means, said reel drive means assuming a first state in which said second reel disk is in a position for engagement with the first tape cassette held on the cassette loading means and a second state in which said third reel disk is in a position for engagement with the second tape cassette held on the cassette loading means;
second driving means driven by a motor and is movable between a first position and second position for driving said reel drive means between said first state and second state respectively corresponding with said first and second positions of said second driving means;
tape loading means disposed at a vicinity of the guide drum between the guide drum and the cassette loading means and carrying a plurality of members which are movable for drawing out the magnetic tape from the first tape cassette when said first tape cassette is held on the cassette loading means or for drawing out the magnetic tape from the second tape cassette when said second tape cassette is held on the cassette loading means, said members being movable between a first state for engagement with the magnetic tape in the first tape cassette on the cassette loading means and a second state for engagement with the magnetic tape in the second tape cassette on the cassette loading means;
third driving means driven by a motor and which is movable between a first position and a second position for driving said plurality of members between said first state and said second state respectively in correspondence with said first and second positions of the third driving means;
first detection means for detecting the placement of the tape cassette on the cassette loading means and for producing an output signal indicating the type of the tape cassette placed thereon indicating whether the tape cassette is the first tape cassette or the second tape cassette;
second detection means for producing an output signal indicating the state of the cassette loading means by detecting the position of the first driving means;
third detection means for producing an output signal indicating the state of the reel drive means by detecting the position of the second driving means;
fourth detection means for producing an output signal indicating the state of the tape loading means by detecting the position the third driving means; and
a controller electrically connected to an operation key of the magnetic recording and reproducing apparatus to be operated by a user for receiving a command from the user, said controller being further connected to said first, second, third and fourth detection means for receiving the output signals from the first, second, third and fourth detection means and discriminating the type of the tape cassette on the cassette loading means and the state of the cassette loading means, reel drive means and the tape loading means on the basis of said output signals, said controller further connected to the motors of said cassette loading means, reel drive means and tape loading means for controlling the energization of the motors responsive to the output signals from the first, second, third and fourth detection means so that the state of the cassette loading means is changed from said first state to said fourth state successively passing through said second and third states, that the state of the reel drive means is set to said first state of the reel drive means, and that the state of the tape loading means is set to said first state of the tape loading means responsive to the command by the user commanding the loading of the tape cassette when it is discriminated in said first detection means that the first tape cassette is placed on the cassette loading means, said controller further controlling the energization of the motors of said first, second and third driving means on the basis of the output signals from said first, second, third and fourth detection means so that the state of the cassette loading means is changed from said first state to said third state after passing through said second state, that the reel drive means is set to said second state of the reel drive means, and that the tape loading means is set to said second state of the tape loading means responsive to the command by the user commanding the loading of the tape cassette when it is discriminated that the second tape cassette is placed on the cassette loading means on the basis of the output signal from said first detection means, said controller further controlling the energization of the motors of said first, second and third driving means on the basis of the output signals from said first, second, third and fourth detection means so that the state of the cassette loading means is changed to said first state from said fourth state successively passing through said third and second states responsive to the command by the user commanding the unloading of the tape cassette when the cassette loading means is in the fourth state, and that the state of the cassette loading means is changed to said first state from said third state after passing through said second state responsive to the command by the user commanding the unloading of the tape cassette when the cassette loading means is in the third state.


2. A tape cassette loading system as claimed in claim 1 in which said third driving means comprises a main gear carrying a reflection pattern for discrimination of the angle of rotation of the main gear, and a plurality of sensors disposed for receiving the reflection from the reflection pattern on the main gear.

3. A tape cassette loading system as claimed in claim 1 in which said controller discriminates the existence of the tape cassette on the cassette loading means on the basis of the output signals of the first detection means responsive to the command by the user commanding the loading of the tape cassette and energizing the motor of the first driving means, such that the state of the cassette loading system is set to the second state when it is discriminated that no tape cassette is placed on the cassette loading means.

4. A tape cassette loading system as claimed in claim 1 in which said controller further sets the state of the reel drive means to its first state by controlling the energization of the motor of the second driving means and sets the state of the tape loading means to its first state by controlling the energization of the motor of the third drive means responsive to the command of the user commanding the loading of the tape cassette when it is discriminated on the basis of the output signals from said first detection means that no tape cassette is placed on the cassette loading system.

5. A tape cassette loading system as claimed in claim 1 in which said controller controlling the energization of the motors of the first driving means, the second driving means and the third driving means energizes the motors of the first, second and third driving means simultaneously responsive to the command by the user commanding the loading of the tape cassette when a change in the state is to be made in the tape loading means and in the reel drive means at the time of setting the state of the tape loading means and the reel drive means responsive to the result of discrimination made in the first detection means.

6. A tape cassette loading system as claimed in claim 1 in which said change in the state of the reel driving means and the tape loading means is made during a time interval in which the state of the cassette loading means is changed from its first state to second state.

7. A tape cassette loading system as claimed in claim 1 in which said tape loading means is further movable from said second state to a third state in which said members are moved further such that the magnetic tape contained in the tape cassette and drawn out by the members makes a tangential contact with the guide drum of the magnetic recording and reproducing apparatus, said third driving means being driven to a third position corresponding to said third state of the tape loading means, said controller controlling said third driving means so as to move to said third position after the cassette loading means has reached its fourth state when the user commanded the loading of the tape cassette and the cassette loading means is carrying the first tape cassette, said controller controlling said third driving means to said third position after the cassette loading means has reached its third state when the user commanded the loading of the tape cassette and the cassette loading means is carrying the second tape cassette.

8. A tape cassette loading system as claimed in claim 1 in which said controller starts a timer when the change in the state of the tape loading means to said first state is completed responsive to the command by the user commanding the unloading of the tape cassette, said controller further starting the change in state of the cassette loading system to its second state, the setting of the state of the reel driving system to its first state, and the setting of the state of the tape loading system to its first state simultaneously when it is discriminated that no tape cassette is placed on the cassette loading means within a predetermined time period on the basis of the output signals from said first detection means.

9. A tape cassette loading system as claimed in claim 1 in which said reel drive means comprises a main frame on which the first reel disk and the second reel disk are carried and a sub-frame on which the third reel disk is carried, said sub-frame is held on an end of a swing arm which is driven by a rotary shaft connected to said second driving means such that the sub-frame is lowered relative to the main frame when the reel drive means is in the first state and that the sub-frame is raised relative to the main frame when the reel drive means is in the second state.

10. A tape cassette loading system as claimed in claim 9 in which said second detection means comprises a first switch which is closed when the sub-frame is in the lowered state and opened when the sub-frame is in the raised state and a second switch which is opened when the sub-frame is in the lowered state and closed when the sub-frame is in the raised state. first state from said fourth state successively passing through said third and second states responsive to the command by the user commanding the unloading of the tape cassette when the cassette loading means is in the fourth state, and that the state of the cassette loading means is changed to said first state from said third state after passing through said second state responsive to the command by the user commanding the unloading of the tape cassette when the cassette loading means is in the third state.

11. A tape cassette loading system as claimed in claim 1 in which said cassette loading means comprises a housing fixed on the body of the magnetic recording and reproducing apparatus, a carriage carried on the housing in a manner movable horizontally between a first and a second state respectively corresponding to said first state and said second state of the cassette loading means, and a cassette tray supported on the carriage in a manner movable in a vertical direction between a first level corresponding to the level of the tape cassette held on the cassette loading means when the cassette loading means is in said first and second states, a second level corresponding to the level of the tape cassette held on the cassette loading means when the cassette loading means is in said third state, and a third level corresponding to the level of the tape cassette held on the cassette loading means when the cassette loading means is in said fourth state by means of a link mechanism, said cassette tray being a generally rectangular tray member adapted to hold the first tape cassette and further having a generally rectangular depressed part adapted for holding the second tape cassette.

12. A tape cassette loading system as claimed in claim 11 in which said first detection means comprises a first switch carried on the tray member such that the switch is closed when the first tape cassette is placed on the cassette tray and a second switch carried on the depressed part such that the switch is closed when the second tape cassette is placed on the cassette tray.

13. A tape cassette loading system as claimed in claim 11 in which said first drive means comprises a gear system for moving the carriage horizontally and for moving the cassette tray vertically, said gear system including a main gear carrying a reflection pattern for discriminating an angle of rotation of the main gear, a tooth provided on a circumference of the main gear for a limited angular range for driving the carriage responsive to a rotation the main gear for a limited rotational angle, a cam gear meshing with the main gear and carrying a cam groove comprising a concentric cam groove part and a spiral cam groove part, and a swing lever having a portion engaged with said cam groove for selectively moving the cassette tray vertically responsive to rotation of the main gear for a limited rotational angle.

14. A tape cassette loading system as claimed in claim 13 in which said second detection means comprises a set of optical sensors disposed so as to face the reflection pattern on the main gear.

Description:
BACKGROUND OF THE INVENTION
The present invention relates in general to a magnetic recording and reproducing apparatus for recording and reproducing an information signal on and from a magnetic tape by means of a recording and reproducing system and in particular to a tape cassette loading system used in a magnetic recording and reproducing apparatus for loading and unloading a magnetic tape contained in a tape cassette on and from the recording and reproducing system of the apparatus.
A current magnetic recording and reproducing apparatus which records and reproduces an information signal on and from a magnetic tape such as a video tape recorder is loaded with a magnetic tape in a manner such that the magnetic tape is contained in a tape cassette for ease of handling as well as for protection of the magnetic tape. In order to load the magnetic tape contained in the tape cassette into the recording and reproducing system of the video tape recorder which includes a guide drum on which magnetic heads are carried, a cassette loading system is used for transporting the tape cassette from an eject position to a predetermined loading position defined relative to the position of the guide drum and for wrapping the tape around the guide drum in a predetermined manner. The loading system is used also for disengaging the magnetic tape from the guide drum and for transporting the tape cassette back to the initial eject position for removal of the tape cassette.
There are several types of tape cassettes which are currently sold in the market. On typical example of such a tape cassette is called a "standard size" tape cassette and is used widely in home video tape recorders. The aforementioned standard size tape cassette may have a typical dimension of 188×104×25 mm, for example, and accommodates a half inch wide magnetic tape wound around a supply reel and a take up reel with such an amount that a few hours of recording time is obtained. The specification for the tape cassette as well as for the recording format on the magnetic tape is standardized in relation to the type of video tape recorder so that the magnetic tape cassettes produced by different manufacturers can be used as long as the specification matches with the type of video tape recorder.
Recently, a more compact video tape recorder has been developed so as to realize a portable video tape recorder combined with a television camera and the like. Such a tape cassette has a reduced size so as to decrease the size and weight of the video tape recorder. In order to reduce the size, the compact size tape cassette contains a smaller amount of magnetic tape having a substantially reduced separation between a supply reel and a take up reel. On the other hand, the recording format of the video signal and the audio signal on the tape are made identical to the "standard size" tape cassette, so that the compatibility with the home video tape recorder currently in use is maintained.
Conventionally, such a compact size tape cassette is reproduced by the home video tape recorder by using an adapter having a size identical to the size of the standard size tape cassette into which the compact size tape cassette is accommodated, as the size and construction of the tape cassette do not match with the loading system of the video tape recorder designed for the standard size tape cassette. However, the use of this adapter is cumbersome and indeed inconvenient. Thus, there is a demand for a cassette loading system of a video tape recorder which can handle both the standard size tape cassette and compact size tape cassette.
United States Patent Application entitled "Tape Cassette Loading System" filed by Mihara et al., based on the Japanese Patent Applications No.253096/1987, No.305165/1987 and No.305164/1987 claiming a priority date of Oct. 7, 1987, discloses a loading system comprising a cassette tray on which a standard size tape cassette and a compact size tape cassette are placed. The cassette tray is carried by a carriage and is movable in a horizontal direction into and out of the body of the video tape recorder. Further, the cassette tray is carried by an elevating mechanism and is movable in a vertical direction. Thus, the standard size or compact size tape cassette placed on the cassette tray is transported to the inside of the video tape recorder horizontally and then transported vertically to the predetermined loading position.
In order to load the magnetic tape in the tape cassette on the guide drum of the video tape recorder, a tape loading mechanism is further needed which enters into the tape cassette and draws out the magnetic tape from the tape cassette in order to wrap the magnetic tape around the guide drum as well as for engaging a drive mechanism with the take up reel and supply reel of the tape cassette. As the aforementioned tape cassette loading system handles both the standard size tape cassette and the compact size tape cassette, such a loading system should be equally capable of handling the magnetic tape contained in the standard size tape cassette and in the compact size tape cassette. However, the size and shape of a cutout portion formed in the tape cassette for allowing entrance of the tape loading mechanism is different for the standard size tape cassette and the compact size tape cassette. This means that the tape loading mechanism must be displaced responsive to the type of the tape cassette to be loaded. It is desirable that the time needed for loading the standard size tape cassette and for loading the compact size tape cassette until the magnetic tape is loaded on the drum of the videotape recorder be equal so that the user of the video tape recorder can play the standard size tape cassette and the compact size tape cassette without noticing any difference in the operation of the video tape recorder.
SUMMARY OF THE INVENTION
Accordingly, it is a general object of the present invention to provide a novel and useful tape cassette loading system wherein the aforementioned problems are eliminated.
Another and more specific object of the present invention is to provide a tape cassette loading system of a magnetic recording and reproducing apparatus in which tape cassettes having different dimension can be played without substantial difference in the operation performed by the user on the magnetic recording and reproducing apparatus.
Another object of the present invention is to provide a tape cassette loading system of a magnetic recording and reproducing apparatus in which loading of tape cassettes having different dimension can be made substantially in an identical loading time.
Another object of the present invention is to provide a tape cassette loading system of a magnetic recording and reproducing apparatus comprising cassette loading means adapted to hold a standard size tape cassette and a compact size tape cassette, said cassette loading means further being movable between an unloading state ready for placement or removal of the tape cassette and a ready-for-loading state ready for drawing out a magnetic tape contained in the tape cassette so as to wrap the magnetic tape around a guide drum of the magnetic recording and reproducing apparatus, tape loading means for drawing out the magnetic tape from the tape cassette and wrapping the magnetic tape around the guide drum, said tape loading means being movable between a first state for drawing out the magnetic tape from the standard size tape cassette and a second state for drawing out the magnetic tape from the compact size tape cassette, and a reel drive means adapted for engaging with a supply reel and a take up reel of the tape cassette placed on the cassette loading means for driving the supply reel and the take up reel, said reel drive means being movable between a first state for engagement with the reels in the standard size tape cassette and a second state for engagement with the reels in the compact size tape cassette, wherein the tape cassette loading system further comprises a controller which detects the type of the tape cassette placed on the cassette loading means, the state of the cassette loading means, tape loading means and the reel drive means and controls the cassette loading means, tape loading means and the reel drive means such that the cassette loading means is moved to a first ready-for-loading position when the standard size tape cassette is placed on the cassette loading means and to a second ready-for-loading position when the compact size tape cassette is placed on the cassette loading means, the tape loading means being set to the first state when the standard size tape cassette is placed on the cassette loading means and to the second state when the compact size tape cassette is placed on the cassette loading means, the reel drive means being set to the first state when the standard size tape cassette is placed on the cassette loading means and to the second state when the compact size tape cassette is placed on the cassette loading means, and the switching of the state of the cassette loading means, tape loading means and the reel drive means being started simultaneously responsive to the start of the loading operation when the tape cassette placed on the cassette loading means is changed from one type to the other. According to the present invention, switching of the state of the tape loading means and the reel drive means responsive to the change in the type of tape cassette is started simultaneously with the movement of the cassette loading means and the time required for switching the state of the loading system responsive to the change of the tape cassette is minimized. Thus, there is no substantial difference in time when a standard size tape cassette is loaded and when a compact size tape cassette is loaded. As a result, the user can load the standard size tape cassette and the compact size tape cassette without noticing substantial difference in the loading operation of the tape cassette loading system. Further, the user can simply place the standard size tape cassette or the compact size tape cassette on the cassette loading means when playing the magnetic recording and reproducing apparatus and the complicated switching operation by the user is not necessary. Thus, the user can play both the standard size tape cassette and the compact size tape cassette without noticing any substantial difference.

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