JPH0489658A - Front loading mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve reliability without generating the defects of recording and reproducing by providing a first position to insert a cassette and a second position to drive a magnetic tape, providing a hole, which diameter is slightly larger than that of a reel stand, at the second position corresponding to the reel stand on the bottom of a cassette holder, providing a hole to be passed from the above-mentioned hole toward the direction of a cassette guide, and providing a projection from the cassette guide while positioning the projection in the inside of the through hole. CONSTITUTION:The first position to insert the cassette and the second position to drive the magnetic tape are provided, and for the bottom shape of a cassette holder 3, the hole having the diameter a little larger than that of a reel stand 8 is provided at the second position corresponding to the reel stand. Then, the through hole is provided from the above-mentioned hole toward the direction of the cassette guide, and the projection is provided from the cassette guide while being positioned in the inside of the through hole. Thus, since an enough interval is secured between the magnetic tape and a tape post 9 when feeding the magnetic tape over the tape post 9, the reliability can be improved without generating damage for the magnetic tape or the defects of recording and reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a front loading mechanism for a magnetic recording/reproducing device such as a VTR.

Prior Art FIG. 3 shows a front loading mechanism of a conventional magnetic recording/reproducing apparatus. In FIG. 3, a cassette 1 has a pair of reels 2 on which magnetic tape is wound. 3 is a cassette holder into which the cassette 1 is inserted in direction A and holds the cassette. The bottom surface of the cassette holder is provided with a pair of holes penetrating toward the front side to avoid a reel stand, which will be described later. Reference numeral 4 denotes side plates, which are located on both sides of the cassette holder and are fixed to a base (not shown). There are long holes 4a in the side plates 4 on both sides.
, 4a' are provided, and bosses 3a, 3a are fixed to the cassette holder 3 through the elongated holes. 5 is a wiper arm, which is provided on both side plates 4, and both wiper arms are fixed together with a shaft 6. The shaft 6 is rotatably locked to the side plate 4.

A long hole is provided at the tip of the wiper arm 5, and a boss 3a is engaged with the long hole. Reference numeral 7 denotes a cassette guide, which is fixed to the side plates on both sides and guides the back surface 1a of the cassette 1 when the cassette 1 moves.

When the wiper arm is rotated by a motor (not shown) in this state, the boss 3a receives force as the wiper arm rotates, and moves along the shape of the long hole provided in the side plate. As a result, the cassette held by the cassette holder also moves along the elongated hole. In FIG. 3, it initially moves horizontally and then vertically. It can also be moved in the opposite direction by changing the rotation direction of the motor. This operation allows the cassette to be moved between a first position where the cassette is inserted and a second position where the reel within the cassette can engage the reel base and drive the magnetic tape.

FIG. 4 is a side view at the time of inserting the cassette. Fifth
The figure is a side view when the cassette is moved from the horizontal direction to the vertical direction. In FIGS. 4 and 5, a reel stand 8 is connected to a motor (not shown) and engages with a pair of reels in the cassette to rotate the reels and thereby drive the magnetic tape. A tape post 9 pulls out the magnetic tape from the cassette and forms a predetermined tape running path. The tip of the tape post is tapered, making it easier for the magnetic tape to fit in when the cassette is lowered. Reference numeral (b) denotes a lid of the cassette, and the lid opening mechanism (not shown) is configured such that the lid opens when the cassette moves in the horizontal direction.

Usually, the back side 1a of the cassette 1 and the surface 7 of the cassette guide 7
A gap is provided between a and a, but if the cassette is moved backwards when inserted, the surface 7a of the cassette guide will guide the back surface 1a of the cassette, and as the cassette descends, it will return to its normal position. Fix it.

Problems to be Solved by the Invention However, in the conventional front loading mechanism, when the cassette is moved backwards during insertion, the back of the cassette is guided by the cassette guide, but if the magnetic tape is slack or static electricity is If the cassette is stuck to the case, when the cassette descends,
The magnetic tape may fall from directly above the tape post, causing damage to the bottom edge of the magnetic tape, or in some cases, the magnetic tape may fall on the opposite side of the tape post, preventing the proper running path from forming, resulting in recording or playback errors. There was a problem.

VTRs these days are becoming thinner, and the height at which the cassette is inserted is getting closer to the height at which the magnetic tape is placed on the tape post, so the magnetic tape may be placed on the tape post before the cassette is corrected to its proper position. There are some cases in which this problem is particularly likely to occur.

Means for Solving the Problems In order to solve the above problems, the front loading mechanism of the magnetic recording and reproducing apparatus of the present invention includes a cassette having a pair of reels wound therein, and a cassette that engages with the reels. a box-shaped cassette holder into which a cassette is inserted and which holds the cassette; a pair of side plates which movably support the cassette holder from both sides; means for moving the cassette holder between a first position and a second position capable of driving the magnetic tape; and a member located in front of the cassette holder and fixed to the side plate, the cassette being in the first position. The cassette holder is equipped with a cassette guide that guides the back of the cassette when moving from the second position to the second position, and the bottom shape of the cassette holder is adjusted so that a hole slightly larger than the diameter of the reel stand is formed on the seventh roller located on the reel stand in the second position. The cassette guide is provided with a protrusion located inside the through hole.

Effect: With the above means, even if the cassette returns to the front side when it is inserted and starts moving, the protrusion provided on the cassette guide will kite the cassette as soon as it starts descending and return it to its normal position at a high position, so the magnetic tape At the time when the magnetic tape is placed on the tape post, there is a sufficient gap between the magnetic tape and the tape post. Therefore, when the cassette is lowered, the magnetic tape and the tape post will not come into contact with each other and damage the lower end of the magnetic tape, and the magnetic tape will not enter the opposite side of the tape post.

Embodiment FIGS. 1 and 2 show an embodiment of the front loading mechanism of the magnetic recording/reproducing apparatus of the present invention.

Since the same numbers as the conventional example have the same configuration as the conventional example, the explanation will be omitted. In FIG. 1, reference numeral 10 denotes a protrusion provided integrally with the cassette guide 7, and is provided in a hole in the reel stand on the bottom surface of the cassette holder 3. FIG. 2 is a side view, at the point where the cassette changes from horizontal to vertical orientation. At this time, even if the cassette moves back to the front side (direction B), it will be guided to the normal position by the protrusion 10 provided on the cassette guide 7 as soon as it starts moving in the vertical direction.

Therefore, the cassette is corrected to its proper position before the magnetic tape is placed on the tape post.

Effects of the Invention As is clear from the above explanation, according to the present invention, even if the cassette is inserted with the cassette returned to the front side, damage to the magnetic tape and recording/reproduction failure will not occur, thereby improving reliability. be able to. In addition, since the cassette is corrected to its normal position immediately after changing from the horizontal direction to the vertical direction, the height can be lowered, and as a result, the main body of the magnetic recording and reproducing device can be made thinner. There is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a front loading mechanism of a magnetic recording and reproducing device of the present invention, FIG. 2 is a side sectional view of the same embodiment, and FIG. 3 is a front loading mechanism of a conventional magnetic recording and reproducing device. 4 and 5.
The figure is a side sectional view of the conventional example. 1...Cassette, 2...Reel, 3.
...Cassette holder, 4...Side plate, 5...Wiper arm, 6...
・Shaft, 7...Cassette guide, 8...
Reel stand, 9... Tape post, 10...
··protrusion. Name of agent: Patent attorney Shigetaka Awano and 1 other person

Claims (1)

[Claims] A cassette having inside a pair of reels wound with magnetic tape, a pair of reel stands capable of engaging with the reels and driving the reels, a box-shaped cassette holder into which the cassette is inserted and holding the cassette; a pair of side plates movably supporting the cassette holder from both sides; means for moving the cassette holder between a first position where the cassette can be inserted and a second position where the magnetic tape can be driven; The cassette guide is a member located on the front side and fixed to the side plate that guides the back of the cassette when the cassette moves from the first position to the second position. A hole slightly larger than the diameter of the reel stand is provided at the position located on the reel stand in the second position, and the hole is provided so as to pass through the hole toward the cassette guide, and the hole is located inside the through hole. A front loading mechanism for a magnetic recording/reproducing device, characterized in that a protrusion is provided from a cassette guide.