JPH039151Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gear transmission mechanism for a tape recorder in which the distance between the shafts is regulated in order to keep the meshing amount of the gears constant.

In conventional tape recorders, the amount of engagement between the drive gear and the idler gear, and between the idler gear and the fixed gear of the reel stand, which is the idler gear and the driven gear, is determined by the movable amount of the swinging member on which the drive gear and idler gear are supported, or by the chassis. It was set by a swinging member being pressed against a provided stopper pin or the like.

Therefore, when the movable amount of the rocking member is left to the maximum amount of movement, the amount of engagement becomes shallower and deeper, and generally becomes deeper, producing gear noise.When a stopper pin is provided on the chassis, assembly work is troublesome, and the amount of engagement is The disadvantage is that the amount is indirectly regulated and proper engagement is often not possible due to variations in the dimensional accuracy of the parts. Conventionally, to avoid these disadvantages, a transmission mechanism using friction wheels with high transmission loss was used. .

The purpose of the present invention is to eliminate the above-mentioned drawbacks and to have a gear transmission mechanism for a tape recorder that uses a boss part and a regulating part to regulate the distance between the axes of the gears so that the meshing between the gears is constant and appropriate using a simple structure. It is to propose.

A feature of the present invention is that, in a gear transmission mechanism for a tape recorder, a gear transmission mechanism for a tape recorder is provided with a transmission gear that can be brought into and out of contact with a gear train that transmits the rotation of a motor to a reel stand. A cylindrical boss portion is provided on at least one gear, and a regulating portion having approximately the same curvature as the outer periphery of the boss portion is provided on a swinging member that rotatably supports the transmission gear and is swingably supported. The regulating portion and the boss portion are brought into contact with each other to regulate the distance between the shafts of the transmission gear and the gear.

The present invention will be explained below with reference to illustrated embodiments.

The gear transmission mechanism of a tape recorder is shown in FIG. 1, in which a head board 2 with a recording/playback head 10 fixed to the upper surface of a chassis 1 is provided so as to be slidable back and forth by a playback operating lever 3 and a recording operating lever 4. A tape supply reel stand 11 and a take-up reel stand 12 are arranged in front of the head board 2, and a capstan shaft 13 and a pinch roller 14 are arranged on the right side of the head board 2 in FIG. It is rotatably supported by a roller case 15 which is rotatably supported by a support shaft 2a provided therein.

The supply reel stand 11 and the take-up reel stand 12
Transmission gears 16, 16' rotated by a motor (not shown) supported by the swinging member 5, and
Further, a transmission gear 17 supported by another swinging member 6 and an idler fixed gear 18 which is a driven gear supported on the chassis 1 are provided.

As shown in FIG.
b is press-fitted into the rectangular hole 3a of the regeneration operation lever 3 through a long hole of the chassis 1 (not shown), and as shown in FIG.
As shown in FIG. 2, a spring 19 is hooked between a pin 2c projecting to the front side of the head board 2 and a protrusion 1a of the chassis 1, so that the head board 2 is urged toward the stop position. FIG. 1 of the head board 2;
On the left side of FIG. 2, a holder 7 with an elongated hole 2d and an erasing head 20 placed thereon is slidably mounted on the head substrate 2, and a protrusion 7a of the holder 7
passes through the elongated hole 2d and the elongated hole of the chassis 1 (not shown) and is press-fitted and fixed into the square hole 4a of the recording operation lever 4, and when the recording operation lever 4 is pressed, the holder 7 and the head board 2 are respectively advanced. Ru.

The playback operation lever 3 and the recording operation lever 4 are connected to another stop operation lever 21, a fast rewind operation lever 8, a fast forward operation lever 9, and a pause operation lever 22.
A locking plate 23 and an operating plate 24 are slidably provided on the chassis 1 so as to be arranged parallel to each other, and perpendicular to each operating lever 3, 4, 8, 9, 21, 22 as shown in FIG. The recording operation lever 4, the fast rewind operation lever 8, the fast forward operation lever 9, the stop operation lever 21, and the pause operation lever 22 are each operated by a spring 25.
29 to the position shown in FIG.

A fixed gear 30, which is a driven gear, is fixed to the supply reel stand 11, and a boss portion A1 is formed of a cylindrical portion concentric with the fixed gear of the supply reel stand 11.

Fixed gears 31 and 32, which are driven gears, are fixed to the take-up reel stand 12, and a boss portion A is a cylindrical portion concentric with the fixed gear of the take-up reel stand 12.
2 are configured.

As shown in FIGS. 2 and 3, the swinging member 5 has a shaft portion 5a at one end rotatably fitted into a shaft hole in the chassis 1, and a shaft portion at the other end into a shaft hole in a small circular plate portion 5b. The upper ends of the rotating shafts 33 of the gears 16, 16' are rotatably fitted, and protrusions 5c, 5 are formed on one side bent in a U-shape.
d is provided so that it engages with the fast rewind operation lever 8 and the fast forward operation lever 9 to swing the small disk portion 5b left and right, and is biased to the right side in FIG. 2 by a spring 34. On the outer periphery of the small disc part 5b, there is a boss part A3, which is a protruding surface concentric with the rotating shaft 33 of the transmission gear 16, and a regulating part B1, B2 is formed by two protrusions on the outer periphery of the small disc part 5b. is configured. Also, the shaft portion 5a
is made to fit slightly loosely into the shaft hole of the chassis, and the regulating part B1 or B2 is connected to the mating boss part A1.
Or, it is made to match the texture when touching A4 paper.

The upper end of the rotating shaft 33 of the transmission gears 16, 16' is supported by the shaft hole of the small disk portion 5b of the swinging member 5 as described above, and the lower end is fixed to the lower side of the chassis 1 as shown in FIG. The shaft hole of the bearing plate 35 is fitted into the shaft hole.

The swinging member 6 is rotatably attached to the chassis 1 with a boss 36 and a screw 37, the transmission gear 17 is rotatably supported at one end, and two restricting portions B3 and B4 project from the supporting position. A spring 38 is wound around the support shaft 2a of the head board 2.
When one end of the head board 2 is inserted into the small hole 6a of the swinging member 6 and the head board 2 is operated forward, it is rotated clockwise.

An inclined surface 8a is formed at the tip of the fast rewind operating lever 8, and faces the protrusion 5c of the swinging member 5.

An engaging portion 9a and a notch 9b are formed at the tip of the fast-forward operation lever 9, and the protrusion 5d of the swinging member 5 is brought into contact with the engaging portion 9a.

A boss portion A4 is formed on the outer periphery of the spindle 39 of the idler fixed gear 18 rotatably supported on the chassis 1.
is configured.

When the gear transmission mechanism of the tape recorder is configured as described above and the fast rewind operation lever 8 is pressed, the inclined surface 8a pushes the protrusion 5c of the swinging member 5, and the swinging member 5 rotates counterclockwise. The transmission gear 16 is engaged with the fixed gear 30 of the supply reel stand 11, and the rotation of the transmission gear 16 is caused by the rotation of the transmission gear 16.
The tape (not shown) is wound onto the supply reel, and the boss portion A of the supply reel stand 11
1 comes into contact with the regulating portion B1 of the swinging member 5, thereby regulating the distance between the axes of the fixed gear 30 and the transmission gear 16, and the amount of engagement between the two gears becomes an appropriate amount.

Next, when the playback operation lever 3 or the recording operation lever 4 is pressed, the swinging member 5 supporting the transmission gears 16, 16' is not operated, so its position is functionally fixed, and the head board 2 is moved forward. As the swinging member 6 is swung, the transmission gear 17 is moved forward and meshes with the transmission gear 16', which is functionally fixed in position, and the fixed gear 31 of the take-up reel stand 12, so that the transmission gear 16' rotates. The tape is transmitted to the take-up reel stand 12 and wound up.

At this time, the regulating part B3 of the swinging member 6 is brought into contact with the boss part A3 of the swinging member 5, and the regulating part B4 of the swinging member 6 is brought into contact with the boss part A2 of the take-up reel stand 12, so that the The distance between the axes of the drive gear 16', the fixed gear 31, and the transmission gear 17, which are fixed in position, is regulated, and the transmission gear 17 is meshed with the transmission gear 16', the fixed gear 31, and the transmission gear 17 with an appropriate meshing amount.

When the fast-forward operating lever 9 is pressed, the protrusion 5d of the swinging member 5 falls from the engaging portion 9a into the notch 9b, the swinging member 5 is rotated clockwise, and the transmission gear 16 is moved to the idler fixed gear 18. The rotation of the transmission gear 16 is meshed with the idler fixed gear 1.
Fixed gear 32 of take-up reel stand 12 via 8
At the same time, the regulating part B2 of the swinging member 5 comes into contact with the boss part A4 of the idler fixed gear 18, and the distance between the axes of the transmission gear 16 and the idler fixed gear 18 is regulated. ,
The meshing amount of both gears becomes appropriate.

When the gear transmission mechanism of the tape recorder is configured as described above, the fixed gears 30, 31 and the spindle 39 fixed to the supply reel stand 11 and the take-up reel stand 12, and the swinging gears whose positions are functionally fixed. Part 5
The regulating portions B provided on the swinging members 5 and 6 are brought into contact with the boss portions A provided concentrically integrally or separately on the fixed gear 18 and the transmission gear 16' supported by the oscillating members 5 and 6, respectively. By doing so, the distance between the shafts of each gear is regulated, and the meshing amount of each gear is regulated to an appropriate amount. It is easy to manufacture and assemble because the restricting part B can be provided concentrically around the outer periphery of the rocker, and since the restricting part B is integrally formed with the swinging members 5 and 6 so as to directly contact the boss part A, manufacturing and assembling are easy. It is easy to do this, and since it is not affected by variations in other dimensional accuracy, the distance between the shafts can be regulated with high accuracy, the amount of engagement can be prevented from fluctuating, and gear noise can be reduced.

The tip of the regulating part B in the above description may be a flat or curved surface, but when it is desired to make it abut against the boss part A, it should be made into a curved surface with a slightly larger curvature than the curvature of the boss part A to achieve surface contact. is desirable.

FIG. 5 shows a modification of the regulating portion B3 of the swinging member 6,
The restricting portion B3' is formed in a U-shape and is connected to the transmission gear 1.
This is an example in which the rotating shaft 33 of 6' is brought into contact with the boss portion A3.

Similarly, the support shaft 39 of the idler fixed gear 18 may be made into the boss portion A4, and the regulating portion B2 of the swinging member 5 may be formed into a U-shape and brought into contact with the boss portion A4.

Since the present invention is configured as described above, the control provided on the swinging member is opposed to the concentric cylindrical boss provided on the gear in the gear train that transmits the rotation of the motor to the reel stand. A simple structure in which the parts are brought into direct contact with each other regulates the distance between the axes and the meshing amount of the gears is kept at a certain appropriate amount. It is easy to manufacture and assemble because it has a circular outer periphery, and the regulating part is formed integrally with the swinging member so as to come into direct contact with the boss part, so it is easy to manufacture and assemble. Since it is not affected by variations in other dimensional accuracy, the distance between the shafts can be regulated with high precision, preventing fluctuations in the amount of meshing of the gears, and reducing gear noise, which has excellent practical effects. A gear transmission mechanism for a tape recorder can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of a tape recorder, FIG. 2 is a plan view of the gear transmission mechanism seen through the chassis of the tape recorder, and FIG. 3 is a plan view of the swinging member. , FIG. 4 is a side view showing the bearing state of the drive gear, and FIG. 5 is a perspective view of a main part of a modified example of the regulating portion. 2... Head board, 5, 6... Swinging member, 11
...Supply reel stand, 12...Take-up reel stand,
16, 16', 17...transmission gear, 18, 30,
31, 32...Driver gear, A...Boss part, B...
Regulatory Department.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a gear transmission mechanism for a tape recorder, in which a transmission gear is provided between a gear train that transmits the rotation of a motor to a reel stand so that the transmission gear can be brought into and out of contact with the gear train, the gear train meshes with the transmission gear. A cylindrical boss portion is provided on at least one of the gears, and a regulating portion having approximately the same curvature as the outer periphery of the boss portion is provided on a swinging member that rotatably supports the transmission gear and is swingably supported. A gear transmission mechanism for a tape recorder, characterized in that the regulating part and the boss part are brought into contact with each other to regulate the distance between the axes of the transmission gear and the gear. 2. A gear transmission mechanism for a tape recorder according to claim 1, in which the boss portion is a shaft of a gear.