JPH06168527A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the device main body size approach to the breadth size of a cassette as much as possible and to look into a tape winding amt., etc., on a cassette label even when the cassette is loaded. CONSTITUTION:The device is constituted to be equipped with a receiving table 11 where the cassette 2 is placed, a movable substrate 7 mounted with a driving mechanism for a reel base 4, etc., for drawing a tape from the cassette, winding the tape around a rotary drum 3 and also traveling the tape, driving means 17-22 for vertically moving the movable substrate to the receiving table and lid opening means 23-27 for opening a cassette lid 2a in interlocking with movement of the movable substrate. These vertical movement driving means are disposed within the cassette width (longitudinal width), and is composed of a cylinder cam 18 to be driven by a driving source and a sleeve 20 that is freely slidable on a supporting shaft 19 and is engaged with a spiral cam groove 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette device in a magnetic recording / reproducing device such as a video tape recorder (VTR).

[0002]

2. Description of the Related Art A cassette mounting device for a magnetic recording / reproducing device of this type is disclosed, for example, in Japanese Patent Publication No.
No. 35824 (G11B 15/675). As shown in FIG. 7, when the cassette 2 is inserted from the cassette inlet / outlet 1a of the apparatus main body 1, the substrate 5 on which the rotating drum 3, the reel stand 4 and the like are mounted is centered around the support shaft 5a as shown in FIG. It is configured so that the reel base 4 is engaged with the cassette 2 by rotating from the position indicated by the dotted chain line to the position indicated by the solid line. 8 shows a plan view when the cassette is mounted, and 6 is a drive mechanism for the substrate 5.

[0003]

In the structure of the above-mentioned mechanism, as can be seen from FIG. 8, the drive mechanism 6 for driving the substrate 5 on which the rotary drum 3 and the like are mounted is provided with the cassette 2.
Inevitably, they are arranged on both sides of the device, and the overall structure of the mechanism becomes large, which is a bottleneck in reducing the size of the device.
Further, the lower surface of the substrate 5 has a relatively large dead space.

[0004]

Means for Solving the Problems A cradle on which a cassette is placed, and a movable mechanism on which a drive mechanism such as a reel table for pulling out the tape from the cassette and winding the tape around a rotating drum and running the tape is placed. The substrate includes a substrate, a driving unit that vertically moves the movable substrate with respect to the pedestal, and a lid opening unit that opens the cassette lid in association with the movement of the movable substrate.

The vertical movement drive means is arranged within the cassette width (longitudinal width) and has a cylindrical cam having a spiral cam groove driven by a drive source and a spiral cam groove slidable on the support shaft. It is composed of an engaging sleeve.

[0006]

When the mounting of the cassette is detected, the movable substrate on which the rotary drum or the like is mounted rises vertically with respect to the cassette by the driving force of the driving source, and the reel stand engages with the cassette. As the movable substrate rises, the cassette lid is opened, the tape is pulled out from the cassette, and the tape is wound on the rotating drum over a predetermined angular range.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a side sectional view immediately after the cassette is inserted (or just before being taken out), FIG. 2 is a plan view of the movable substrate, FIG. 3 is a front sectional view corresponding to FIG. 1, a side sectional view after completion of cassette mounting, and FIG. A front sectional view corresponding to FIG. 4,
FIG. 6 is an external perspective view of the apparatus body.

In the figure, 7 is a movable substrate on which the rotary drum 3, reel stand 4, etc. are mounted, and cassette positioning pins 8, 8 and cassette reel lock release pin 9 are also provided on the movable substrate 7, although not shown. The drive parts for are mounted. 10 is a frame that constitutes the apparatus main body,
Reference numeral 11 denotes a cassette pedestal, which is fixed to the frame 10. Reference numeral 12 is a top plate that constitutes a part of the apparatus main body
It is stuck at 0. 13 is a cassette door rotatably attached to the top plate 12, 14 is a leaf spring for pressing the cassette, and 15 is a cassette insertion detection switch.

Reference numeral 16 denotes a gear which is rotatably arranged on the frame 10 and which transmits a decelerated driving force from a driving source (not shown). The gear 16 is a cylindrical cam having a spiral cam groove 17 formed therein. 18 is fixed. The cylindrical cams 18 are arranged at the four corners of the movable substrate 10. A guide shaft 19 fixed to the frame 10 is a shaft for guiding the movable substrate 7 in the vertical direction. Sleeve 2 is attached to the shaft 19.
0 is slidably inserted, and the convex portion 20a of the sleeve 20 is
Engage with the spiral cam groove 17. Reference numeral 21 is a spring inserted between the sleeve 20 and the movable substrate 7, 22 is a guide having a concave groove 22a, and the convex portion 20b of the sleeve 20 is engaged with the concave groove 22a. As shown in FIGS. 2 and 3, the vertical movement mechanism of the movable substrate 7 is arranged within the width of the cassette 2 to reduce the size of the entire apparatus.

Reference numeral 23 is a linear fixed rack fixed to the frame 10, 24 is a movable rack slidably fixed to the bent piece 7a of the movable substrate 7, and 25 is a gear 26 and a movable rack meshing with the fixed rack 23. 24 is a two-stage gear integrally formed with a gear 27 that meshes with the second gear 25.
It is attached to be freely rotatable. Reference numeral 30 is a lock release lever having a pin 30a for releasing the lock of the cassette lid 2a. The lock release lever 30 is attached to the side surface of the cassette pedestal 11, but is made of an elastic sheet metal in order to keep the lateral width of the apparatus main body as small as possible.
The caulking may be done so that it does not protrude too much from the cassette receiving stand 11.

The operation of the present invention will be described below. In FIGS. 1 and 3, the cassette 2 is replaced with a cassette pedestal 11
When mounted on, the switch 15 operates. At the same time, the lock portion of the cassette lid 2a engages with the lock release pin 30a, and the lock of the cassette lid 2a is released. By the operation of the switch 15, a driving force of a driving source (not shown) such as a motor is received, and the cylindrical cam 18 integrated with the gears 16, 16 ...
18 ... rotates. By the rotation of the cylindrical cams 18, 18, the sleeves 20, 20 ... follow the spiral cam grooves 17 and the guide shafts 19, 19 ... are raised. Since the convex portion 20b of the sleeve 20 is engaged with the concave groove 22a of the guide 22, the sleeve 20 rises in the vertical direction without rotating. As the sleeves 20, 20, ... Raise, the movable substrate 7 rises via the spring 21, and reel stands 4, 4, cassette positioning pins 8, 8, reel lock release pin 9
Engage with the respective parts of the cassette 2 (see FIGS. 4 and 5).

The gear 26 meshed with the fixed rack 23 rotates counterclockwise (CCW) in conjunction with the vertical movement of the movable substrate 7. The rotation of the gear 27, which is integral with the gear 26, to the CCW raises the movable rack 24, opens the cassette lid 2a, and the tape is pulled out from the cassette 2, that is, the mounting of the cassette is completed. Upon detecting this time point, the drive source is stopped and the movable substrate 7 is held at a predetermined position. After that, the operation mode of recording / playback / fast-forwarding of tape is performed. In order to take out the cassette 2, the operation reverse to the above is performed by the eject operation. That is, the movable substrate 7 descends, and the reel base 4, the reel lock release pin 9 and the like escape from the cassette 2. After detecting the completion of lowering of the movable substrate 7,
All you have to do is remove the cassette 2.

Next, the opening stroke H of the cassette lid 2a
Will be described. The gear 26 and the gear 2 of the two-stage gear 25
Let the radii of 7 be R and r, respectively. As shown in FIGS. 1 and 4, the distance between the lowered position and the raised position of the movable substrate 7 with respect to the frame 10 is set to h ₁ and h ₂ , respectively, and the upper end surface of the movable rack 24 and the cassette when the movable substrate 7 is lowered. The distance between the lower surfaces of the lid 2a is H ₁ , and the required opening stroke of the cassette lid 2a is H ₂ . Moving amount of movable substrate 7 h ₀ = h
₂₋ h ₁ , the moving amount of the movable rack 24 is H ₀ = H ₁ + H ₂ , and if the rotation angle of the two-stage gear 25 is θ °, then h ₀ = R
・ Θ, H ₀ = r × θ. Therefore, H ₀ = h ₀ × r / R
= (H ₂ −h ₁ ) × r / R, and the moving amount of the movable rack 24 is proportional to the radius ratio of the two gears 26 and 27 of the two-stage gear 25. Although r / R <1 is set in FIGS. 1 and 4,
When the moving amount of the movable substrate 7 is small, r / R> 1 may be set to increase the moving amount of the movable rack 24.

FIG. 6A shows a perspective view of the apparatus, showing the cassette 2 through the transparent window 28a on the top surface of the apparatus main body 28 with the cassette 2 mounted. In addition, FIG. 6B shows another example, in which the apparatus main body 2
The cassette 2 can be mounted by opening the door 29 on the top surface of No. 8. Also in this case, the cassette 2 can be seen through the window 29a.

[0015]

The vertical movement mechanism of the movable substrate can be arranged within the lateral width of the cassette, and as a result, the lateral width of the main body of the apparatus can be made approximately the same as the lateral width of the cassette, which is effective for downsizing of the apparatus. is there. It is easy to use because you can see the label of the cassette or the amount of tape wound with the cassette installed.

[Brief description of drawings]

FIG. 1 is a side sectional view immediately after insertion of a cassette (or immediately before removal).

FIG. 2 is a plan view of a movable substrate.

FIG. 3 is a front sectional view corresponding to FIG.

FIG. 4 is a side cross-sectional view when a cassette is completely attached.

5 is a front sectional view corresponding to FIG.

FIG. 6 is an external perspective view of the apparatus body.

FIG. 7 is a side sectional view of a conventional example.

FIG. 8 is a plan view of a conventional example.

[Explanation of symbols]

 7 Movable Substrate 11 Cassette Cradle 17 Spiral Cam Groove 18 Cylindrical Cam 19 Guide Shaft 20 Sleeve 23 Linear Fixed Rack 24 Movable Rack 25 Two Stage Gear 27 Cassette Lid Lock Release Lever

Claims (5)

[Claims] 1. A pedestal on which a cassette is mounted, a movable substrate on which a drive mechanism such as a reel table for pulling out the tape from the cassette and winding the tape around a rotating drum and running the tape is mounted. A magnetic recording / reproducing apparatus comprising: a driving unit that vertically moves the movable substrate with respect to the pedestal. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the vertical movement driving means is arranged within a cassette width (width in the longitudinal direction). 3. The vertical drive means comprises a cylindrical cam having a spiral cam groove driven by a drive source, and a sleeve which is slidable on a support shaft and engages with the spiral cam groove. The magnetic recording / reproducing apparatus according to claim 1. 4. A cradle equipped with a cassette lid lock releasing means and a cassette mounted thereon, and a drive mechanism such as a reel stand for drawing the tape from the cassette, winding the tape around a rotating drum, and running the tape. And a drive means for vertically moving the movable substrate with respect to the pedestal, and an opening means for opening the cassette lid in conjunction with the movement of the movable substrate. And a magnetic recording and reproducing device. 5. The lid opening means is fixed rack, movable rack slidably attached to the movable substrate, and rotatably attached to the movable substrate to mesh with the fixed rack and movable rack, respectively. 5. The magnetic recording / reproducing apparatus according to claim 4, wherein the magnetic recording / reproducing apparatus comprises a two-stage gear.