JPS61222054A - Operation controller for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate the restriction of relation of positions by mounting directly a moving contact on a turning gear and mounting the gear on a circuit board while the relative relation of position with the gear is restricted to avoid deviation between gears due to backlash. CONSTITUTION:The torque of a drive motor 10 of a drive means 18 is delivered to a pulley 12 through a belt 11, the torque of a gear 13 incorporated with the pullet 12 is delivered to a gear 3 via gear 14 to drive the gear 3 to plural rotation moving positions. A moving contact 4 is moved around a shaft 2 while being incorporated with the gear 3 when the gear 3 is turned while being in contact with the circuit board 5, and the contact 4 is short-circuited to opposed projections 6c, 6d of fixed contacts 6a, 6b on the board 5 to be brought into conductive state. The conductive state of the contacts 6a, 6b is detected by a means 17, a detection signal is sent to a control means 19 to control a means 18.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Purpose of the Invention - Industrial Application Field The present invention provides an operation control device for a magnetic recording/reproducing device that controls various operating states such as stop, fast forwarding and rewinding of the magnetic recording/reproducing device. It is related to.

2. Description of the Related Art A conventional operation control device for a magnetic recording and reproducing apparatus includes, for example, a detection switch shown in Japanese Patent Application No. 57-30974.

That is, as shown in FIGS. 4 and 5, the drive motor 20
The rotation of the belt 21, pulley 22, gear 23, gear 24
The signal is transmitted to gear 25 through. By transmitting the 2° rotation of the drive motor, a plurality of gears 25 (4 in the conventional example)
rotationally move to the position of Further, by rotationally moving the gear 25 to a plurality of positions, the gear 28 and the cam lever 27, which serve as switching means for switching the operation mode (for example, fast forward, rewind, stop, etc.) of the magnetic recording/reproducing device, are rotated. Also, a mode switch 28 for detecting the state of each operation mode.
The gear 28 in the mode switch 28 and the gear 25 are attached so as to mesh with each other. The four opposed protrusions of the fixed contacts 30a and 30b in the mode switch 28 correspond to a plurality of rotational movement positions of the gear 25, and the rotational movement of the gear 25 (four pieces) causes the gear 2 to move.
9 also rotates facing the gear 25, and the movable contact 31 engaged with the gear 28 is integrated with the gear 28, and the fixed contact 30
The gear 25 moves while touching the circuit board 32 having the
The fixed contacts 30a, 3 are rotated to multiple movement positions.
0b becomes conductive, the state of each operation mode is detected through a detection means (not shown), and the drive motor 20, which is the drive source of the gear 25, is controlled through a control means (not shown). . Note that 33 indicates an axis.

Problems to be Solved by the Invention In the structure as described above, the fixed contacts 30a and 30b move on the four opposing protrusions corresponding to the plurality (four) rotational positions of the gear 25. A shift occurs in the movable contact due to backlash between gear 25 and gear 28.

In addition, the gear 29 in the mode switch 28 and the gear 2 are arranged so that the rotational movement positions of the gear 25 correspond to the four opposing protrusions of the fixed contacts 30a and 30b.
It is difficult to mesh the mode switch 28 with the mode switch 28, and there is also the problem that providing the mode switch 28 separately increases the number of parts and increases the cost.

In view of the above problems, the present invention eliminates the influence of backlash occurring between the fixed contact 30 corresponding to the rotational movement position of the gear 25 and the movable contact 31 that moves on the fixed contact 30, and also An object of the present invention is to provide an operation control device for a magnetic recording/reproducing device that can easily regulate the relative position with respect to the contact point 3o, can reduce the number of parts, is compact, and can reduce costs.

(2) Means for Solving the Constituent Problems of the Invention In order to solve the above-mentioned problems, the operation control device for a magnetic recording/reproducing device of the present invention has a shaft mounted on a substrate, and a shaft mounted concentrically to this shaft. A gear that fits together and rotates to a plurality of rotational movement positions, and a gear that fits on the shaft and is placed on the substrate so as to regulate a relative positional relationship with the gear, and a plurality of rotational movement positions of the gear. a circuit board having a fixed contact corresponding to the gear, a movable contact that is integral with the gear and moves while in contact with and away from the fixed contact on the circuit board, and in contact with the fixed contact on the circuit board, and a plurality of positions of the gear a switching means for switching the operation mode of the magnetic recording/reproducing device in accordance with the above, a driving means for driving the gear, a detecting means for detecting conduction or non-conduction between the movable contact and the fixed contact, and an output of the detecting means. and control means for controlling the drive means.

Effect The present invention has the above-described configuration, and by attaching the movable contact directly to the gear that rotates to a plurality of rotational movement positions,
Misalignment caused by backlash between gears has been eliminated. In addition, by placing it on the board so as to regulate the relative positional relationship with the gear that rotates to multiple rotational movement positions, it became easy to regulate the relative position with the gear that rotated to multiple rotational movement positions. . Furthermore, by directly attaching the movable contact to a gear that rotates to a plurality of rotational positions, it is possible to reduce the number of parts and downsize the device.

EMBODIMENTS Below, the drawings shown as an embodiment of the present invention will be explained.

FIG. 1 is a side sectional view of an operation control device for a video tape recorder (VTR) as a magnetic recording and reproducing device.

1 is a board on which a plurality of parts of the VTR are placed; 2 is a shaft mounted on the board 1; 3 is a gear,
It is fitted so as to be rotatable about the shaft 2, and has a notch 3a and a cam groove 3b inside. This gear is regulated to rotate to a plurality of (four in this embodiment) rotational positions, and is engaged with the movable contact 4. 5 is a circuit board having fixed contacts 6a and 8b. The fixed contacts 8a and 8b are two concentric contacts having two opposing protrusions corresponding to a plurality of rotational movement positions of the gear 3.

7a is a cylindrical protrusion, and 7b is an annular convex part, each of which is molded on the circuit board 5. In this embodiment, the cylindrical protrusion 7a and the annular convex part 7b are integrally molded. There is.

The circuit board 5 is fitted to the shaft 2, the cylindrical protrusion 7a is engaged with the hole 8 on the board l, and the 0-circular annular protrusion 7b regulating the relative positional relationship with the gear 3 is connected to the gear 3. It is disposed concentrically with the inner notch of the gear 3, and is in an engaged state such that it can rotate within the notch of the gear 3 with a slight gap in the longitudinal direction of the shaft 2. Further, the movable contact 4 is engaged with the gear 3 so as to rotate integrally therewith, and is in contact with the circuit board 5. A spring 9 is provided between the gear 3 and the circuit board 5.

FIG. 2 is a front view showing the surface of the circuit board 5 facing the gear 3. In FIG.
It has Bd.

FIG. 3 is a plan view of the VTR operation control device of this embodiment. 10 is a drive motor which is a drive source, and a belt! 1,
Gear 3 is driven through pulley 12, gear 13, and gear 14. A gear 15 is one of the switching means for switching the operation mode of the VTR, for example, fast forwarding, rewinding, etc., and meshes with the gear 3. Further, lE+ is a cam lever, and the gear 15
Similarly, it is one of the switching means and engages with the cam groove 3b of the gear 3. Reference numeral 17 denotes a detection means that detects conduction or non-conduction between the fixed contacts 8a and eb on the circuit board 5. 1
Reference numeral 8 denotes a driving means for driving the gear 3, which is comprised of the motor 10, belt 11, pulley 12, and gears 13 and 14. 18 is a drive means for driving the gear 3, and 18 is a control means for controlling the drive means, and the output of the detection means 17 is used to control the VTR.
It is designed to switch to each operation mode.

The operation of the VTR operation control device configured as described above will be explained below.

The rotation of the drive motor 10, which is the drive source of the drive means 18, is transmitted to the pulley 12 through the belt 11 and rotated. Gear 13, which is integral with boo 912, also rotates, and this rotation is transmitted to gear 3 via gear 14, causing gear 3 to rotate to a plurality of rotational movement positions. Due to this rotational movement of the gear 3, the movable contact 4 rotates integrally with the gear 3 while being in contact with the circuit board 5 around the shaft 2. The movable contact 4 is connected to the opposing protrusions 6c and 6 of the fixed contacts 6a and 6b on the circuit board 5.
By moving to position d, the fixed contacts are short-circuited and made conductive. The four protrusions 6c and 6d correspond to the multiple rotational positions of the gear 3 that switches between multiple operating modes of the VTR, such as fast forwarding and rewinding, so that the gear 3 can be positioned at the position where the gear 3 switches between each operating mode of the VTR. By rotationally moving, the movable contact 4 touches the protrusion 6 of one of the fixed contacts 6a and 8b.
Move onto C1ed and make fixed contacts θa and 8b conductive. The detection means 17 detects the conduction state of the fixed contacts 8a and 6b, and sends the detected signal to the control means 18. The control means 18 controls the drive means 1 according to the output signal of the detection means 17.
8 control is carried out.

As described above, according to this embodiment, the movable contact 4 is directly attached to the gear 3 that rotates to a plurality of rotational movement positions, so that the movable contact 4 and the fixed contact 8a move in response to the rotational movement of the gear 3, This eliminates errors caused by backlash with 8b and makes it possible to reduce the number of parts. Furthermore, by rotatably engaging the annular convex portion 7b provided on the circuit board 5 and the cutout portion 3a of the gear 3, it is possible to prevent dust and debris from entering from the outside, and the movable contact 4 and Fixed contact E
la.

The electrical contact between the protrusions 8c and 8d of 8b is made stable.

In addition, by placing the circuit board 5 on the board l so as to restrict the relative positional relationship with the gear 3, the gear 3 and the fixed contact 8a
, 8b can be easily controlled by molding the circuit board 5 integrally with the annular convex portion 7b as a mounting means, and the manufacturing process and number of parts can be reduced.

(3) Effects of the Invention As described above, in the present invention, the relative positional relationship between the movable contact that moves in response to the movement of the gear that rotates to a plurality of positions and the fixed contact on the unitary board is constant. It is now possible to prevent misalignment caused by backlash, which was seen in the conventional example. Further, it is possible to easily regulate the relative positional relationship between the concentrically attached gears and the circuit board having fixed contacts, and the number of constituent parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing the main parts of an operation control device for a magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a plan view of the circuit board in FIG. 1, and FIG. 3 is a magnetic recording/reproducing device. FIG. 4 is a block diagram of a mode switch of a conventional magnetic recording/reproducing apparatus, and FIG. 5 is a plan view of the main parts of the conventional magnetic recording/reproducing apparatus. 1... Board 2... Shaft 3... Gear 3a
...Notch 4...Movable contact 5...Circuit board
Eta, 8b...fixing liquid/point 7a...cylindrical protrusion 7b...annular convex part 8...hole 15
．． 18...Switching means 17...Detection means 18...
・Driving means 19... Control means agent Patent attorney
Oshima - Fraction 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A shaft planted on a substrate, a gear that is concentrically fitted to this shaft and rotates to a plurality of rotational movement positions, and a gear that is fitted to the shaft,
and a circuit board that is placed on the board so as to regulate the relative positional relationship with the gear and has fixed contacts corresponding to a plurality of rotational movement positions of the gear, and the circuit board is integrated with the gear and is A movable contact that moves while in contact with and away from a fixed contact on the circuit board, and a switching means that switches the operating mode of the magnetic recording and reproducing device in accordance with a plurality of positions of the gear, and a switching device that drives the gear. A magnetic recording and reproducing device comprising a driving means, a detecting means for detecting conduction or non-conduction between the movable contact and the fixed contact, and a control means for controlling the driving means with the output of the detecting means. Motion control device. (2) As a circuit board, it has a plurality of fixed contacts inside and a concentric annular convex part, and this annular convex part is
An operation control device for a magnetic recording and reproducing device according to claim 1, which is rotatably engaged within a notch provided inwardly of a gear of a circular center. (3) The operation control device for a magnetic recording/reproducing device according to claim 1, wherein the hole provided on the substrate is provided so that the cylindrical protrusion on the circuit board engages with the hole provided on the substrate.