JPH039143Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement of a reel rotation detection device used in a tape end detection device in an automatically reversing type cassette tape recorder for tape running.

It is well known that in conventional automatic reversing type cassette tape recorders for tape running, rotation is detected from both reel stands in order to prevent malfunctions caused by tape slack in the cassette. Generally, there are various types of devices, but all of them have drawbacks such as complicated configurations, troublesome assembly work, long working hours, and high manufacturing costs.

In order to eliminate the above-mentioned drawbacks of the conventional method, this invention has a simple structure, allows you to select either direction depending on the tape running direction, and also maintains a stable back tension on the side that becomes the supply reel. The purpose is to provide a device that can

Hereinafter, this invention will be explained in detail based on the embodiment shown in the drawings. Reference numeral 1 denotes a board, and drive shafts 3 are provided at two locations on the board at a predetermined distance via metal bearings 2. .

Reference numeral 4 denotes a connecting rod in which the metal bearing 2 and the drive shaft 3 are fitted into an elongated hole 4a to restrict movement in a direction that connects the two drive shafts, allowing a predetermined movement.

A sleeve 5 having a flange 5a formed at the lower end is fixed to the tip of each of the drive shafts 3 sequentially from the lower position, and a contact surface is placed on the surface of the flange 5a with a predetermined frictional resistance. 6a and integrally formed with a hanging piece 6b from a part of its outer periphery, a spring 7 is placed on the surface of the contact 6a of this rotation detection member 6, and the top of this spring is pressed. Fix the reel stand 8 with.

Further, each of the connecting rods 4 is provided with a pressing portion 4b that is pressed by a hanging piece 6b of the rotation detecting member 6 provided on the reel stand side that is the tape winding side. Projecting pieces 9 are provided on the reel stand side, which is the tape supply side, with which the hanging pieces 6b of the rotation detecting member 6 come into contact.

Next, to explain its effect, tape running is the first
In the case shown by the arrow in the figure, both the left and right reel stands 8 are rotating counterclockwise, and therefore, the above-mentioned rotation detection device attached to the right reel stand 8, which is the tape winding side, Since the member 6 is in contact with the surface of the flange 5a formed on the sleeve 5 which rotates together with the drive shaft 3 with a predetermined frictional resistance, it is similarly rotated counterclockwise and the droop formed thereon The piece 6b presses the pressing part 4b formed on the connecting rod 4, and continues to push the connecting rod 4 to the right while the reel stand 8 continues to rotate, and a member (not shown) linked to the right end of the connecting rod 4 For example, by restricting the movement of a lever or eccentric cam that is biased in the direction of shifting the connecting rod 4 to the left, the reel stand 8
detects that it is rotating.

When winding of the tape is completed, the force of the hanging piece 6b of the rotation detecting member 6 pushing the connecting rod 4 to the right becomes weaker, so the connecting rod 4 is pushed to the left by the biasing force of the lever, eccentric cam, etc. Move to reel stand 8
Switch to stop (stop mode) or reverse rotation (reverse mode). As these means, conventionally known means are used.

On the other hand, since the rotation detection member 6 attached to the left reel stand 8 on the tape supply side is also in frictional contact with the flange 5a formed on the sleeve 5, it cannot rotate counterclockwise. Since the reel base 8 comes into contact with a protrusion 9 provided on the substrate 1 and is prevented from rotating further, the reel stand 8 rotates with a predetermined frictional resistance and can apply a predetermined tension to the tape.

Further, when the tape running is reversed as shown by the arrow in FIG. 2, the left reel stand 8 becomes the tape winding side and rotates clockwise, and the rotation detection member
rotates clockwise and its hanging piece 6b connects to the connecting rod 4.
The pressing part 4b formed in the above direction is pushed to the right to detect the rotation in the same manner as described above, and the right reel stand 8 also rotates clockwise, the rotation detection member 6 also rotates clockwise, and the hanging piece 6b is rotated clockwise. Projection piece 9 provided on the board 1
contact with and prevent further rotation, therefore,
The reel stand 8 rotates with a predetermined frictional resistance and can apply a predetermined tension to the tape.

As explained above, in this invention, depending on the running direction of the tape, the hanging piece formed on the rotation detecting member attached to the reel stand, which is always on the tape winding side, pushes the connecting rod to detect rotation. At the same time, the rotation detecting member attached to the reel stand on the tape supply side can apply a predetermined frictional resistance to the reel stand and apply a predetermined tension to the tape.

Further, the structure of this invention is extremely simple, the assembly work is simple, and the manufacturing cost is low.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; FIG. 1 is a plan view of the main part when the tape winding and supply direction is counterclockwise, and FIG. 2 is a plan view of the main part when the tape is wound and fed in the counterclockwise direction.
FIG. 3 is a partially vertical side view of the main part. DESCRIPTION OF SYMBOLS 1... Board, 2... Metal bearing, 3... Drive shaft, 4... Connection rod, 4a... Long hole, 4b... Pressing part, 5... Sleeve, 5a... Flange, 6...
Rotation detection member, 6a... contact surface, 6b... hanging piece, 7... spring, 8... reel stand, 9...
protrusion.

Claims (1)

[Scope of utility model registration request] In an automatic reversing type cassette tape recorder that runs the tape, drive shafts are provided at two locations on the board at a predetermined distance, and these drive shafts are fitted into elongated holes to restrict movement in the direction that connects both drive shafts. A connecting rod is provided, and the tip of each of the drive shafts has a contact surface that contacts the flange and the flange surface with a predetermined frictional resistance, and a hanging piece is integrally formed from a part of the outer periphery of the contact surface. A reel stand is fixed to the distal end of the formed rotation detecting member, and the connecting rod has a pressing portion that is pushed by a hanging piece of the rotation detecting member provided on the reel stand side that is the tape winding side. a reel rotation detection device, wherein the substrate is provided with protrusions that come into contact with hanging pieces of the rotation detection member provided on the reel stand side, which is the tape supply side.