JPS6023815Y2 - Record player arm horizontal position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an arm horizontal position detection device using optical means, which is used, for example, in an electronically controlled fully automatic record player.

A fully automatic record player equipped with an electronically controlled automatic mechanism has already been developed by the same applicant.

This record player employs an arm horizontal position detection device using optical means.

It is conceivable that this horizontal position detecting device could be improved as described below by adding improvements to the device developed above.

The horizontal position of the arm is detected by attaching a slit plate to the horizontal axis of the arm that rotates as the arm rotates, and detecting the slit (hole) on this plate with a photocoupler. It is something.

More specifically, the start end corresponds to the play start position on the record, the end corresponds to the play hole corresponding to the play end position on the record, the end detection hole corresponding to the end of this play hole, and the rest position. A rest hole is formed on the slit plate.

Furthermore, photocouplers are provided to detect the play hole, end detection hole, and rest hole, respectively.

The arm is then It detects the time when the arm is horizontally driven to the playing start position of the record, the time when the arm reaches the end position of the record, and the time when the arm returns to the rest position.

By the way, the above photocoupler is rotatably supported concentrically with the slit plate because it is necessary to match the timing at which the photocoupler detects the play hole, end detection hole, or rest hole with the actual position of the 9 arms. is held on the movable adjustment arm via a photocoupler holder.

In this case, if a dedicated movable adjustment arm is provided for each of the multiple photocouplers, the number of parts will increase and adjustment of each photocoupler will be complicated, so it is recommended to hold all the photocouplers in one movable adjustment arm. , or one movable adjustment arm holds multiple photocouplers that detect each play hole corresponding to the size of the record, and the other
It is conceivable that a plurality of photocouplers for detecting the end detection hole and the rest hole are held by one movable adjustment arm.

In any case, a plurality of photocouplers will be held by one movable adjustment arm.

However, when holding multiple photocouplers on one movable adjustment arm in this way, each photocoupler must be attached to the slit plate because the holes in the slit plate are formed at different distances from the fulcrum of the slit plate. They must be placed side by side on a straight line connecting the fulcrums.

For this reason, when a photocoupler holder holding a plurality of photocouplers is attached to a movable adjustment arm, the photocouplers often become misaligned with the number holes of the slit plate.

In other words, if each photocoupler is placed on a straight line connecting the fulcrums of the slit plate, the trajectory of the photocoupler when the movable adjustment arm is rotated will be the same as the trajectory of the hole in the rotating slit plate. Therefore, the discrepancy between the timing at which the photocoupler detects the hole and the actual position of the arm can be adjusted by adjusting the rotation of the movable adjustment arm.

However, when attaching the photocoupler holder to the movable adjustment arm, if the photocoupler deviates from the straight line connecting the fulcrum of the slit plate, the trajectories of the photocoupler and the hole in the slit plate will no longer match, and therefore the movable adjustment No matter how the arm is rotated and adjusted, the above-mentioned deviation cannot be eliminated, and care must be taken when attaching the photocoupler holder to the movable adjustment arm.

This idea was made in view of the above-mentioned circumstances.
While forming a rest hole and a play hole in the slit plate,
By providing an end detection hole to determine the end of the play hole, and by forming engaging portions for positioning at multiple predetermined locations on the movable adjustment arm and the photocoupler holder, malfunctions can be prevented and the movable adjustment arm It is an object of the present invention to provide an arm horizontal position detecting device for a record player in which a photocoupler holder can be easily and quickly attached without causing a positional shift of the photocoupler.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a plan view showing an embodiment of an arm horizontal position detection device for a record player according to this invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1 and shown together with the arm.
In both of these figures, 1 is an arm, 2 is an arm horizontal shaft, and this arm horizontal shaft 2 is rotatably held in a housing 3 by an arm horizontal bearing 4.

A slit plate 5 is attached to the arm horizontal shaft 2 held in this manner.

This slit plate 5 is formed into a fan shape, and has a rest hole of 6.30 cm and a record play hole of 7.17 cm on its plane.
A play hole 8 for a record disc and further an end detection hole 9 for the play holes 7 and 8 are formed.

Here, the rest hole 6 corresponds to the rest position.

In addition, the play hole 7 for a 30Crn record has a starting end 71.
corresponds to the playing start position on a 30cm record, and the ending position is 7.
□ corresponds to the play end position of the same record, and similarly, the play hole 8 for the 17crIL record is located at the starting end 81.
corresponds to the play start position of the 17cm record, and the end 8□ corresponds to the play end position of the same record.

10 is a first movable adjustment arm located parallel to the slit plate 5, and 11 is a second movable adjustment arm located similarly.

These movable adjustment arms 10.11 are connected to the slit plate 5.
It is attached to the horizontal bearing 4 so that it is held concentrically with the horizontal bearing 4.

Furthermore, the movable adjustment arm 10°11 is rotatable relative to the horizontal bearing 4 during adjustment.

A photocoupler 12 for detecting the rest hole 6 and a photocoupler 13 for detecting the end detection hole 9 are held on the first movable adjustment arm 10.

Further, on the second movable adjustment arm 11, photocouplers 14 and 15 for detecting each of the play holes 7 and 8 are held.

In this case, a photocoupler holder 16.17 is mounted on the movable adjustment arm 10.11, on which the photocouplers 12, 13 and 14, 1
5 is attached.

Further, the photo coupler holder 16.17 has the photo couplers 12, 13 and 14.15 connected to the hole 6 of the slit plate 5.
9 and 7.8, that is, the trajectory of the photocouplers 12, 13, 14, 15 and the rotating slit plate 5 when the movable adjustment arm 10.11 is rotated. The movable adjusting arm 10.11 is positioned such that the trajectories of the boreholes 6, 9 and 7.8 coincide.

Therefore, when the photocoupler holders 16 and 17 are attached to the movable adjustment arm 10°11, each photocoupler 12.
Move the movable adjustment arms 10, 11 and the photocoupler holder 16 so that 13 and 14.
．． 17 Retaining parts 18.1 for positioning at a plurality of mutually pre-positioned locations, here two locations on the left and right in the figure.
9 are formed, and the photocoupler holder 16.17 is attached to the movable adjustment arm 10.11 with these engaging portions 18.19 engaged, for example, by screws 20, 21.

In this case, the engaging portions 18 and 19 have a relatively simple configuration of concave portions and convex portions as in the illustrated embodiment, and positioning engagement is achieved by fitting these concave and convex portions.

Note that each of the photocouplers 12 to 14 is configured by arranging a light emitting element, here a lamp 22 and a light receiving element 23, facing each other.

Next, the operation of the device configured as described above will be explained.

First, when the arm 1 is at the rest position, the slit plate 5 is in a state where the rest hole 6 is aligned with the photocoupler 12.

That is, the rest hole 6 is detected by the photocoupler 12, and it is thereby detected that the arm 1 is at the rest position (rest position).

Next, when the arm 1 is horizontally driven in the direction of the record from the rest position, the slit plate 5 is rotated forward clockwise in FIG. , the starting end 71 of the play hole 7 for a 30 cm record is aligned with the photocoupler 14.

That is, in the photocoupler 14, the light-receiving element 23 changes from a non-light-receiving state to a light-receiving state.
The starting end of the play hole 7 for the m record is detected.

Further, it is thereby detected that the arm 1 has reached the performance start position of the 30 cm record disc.

Arm 1 reaches above the playing start position of the 30cm record
Thereafter, the arm 1 descends to the above-mentioned position and starts playing the record, and during this playing, the arm 1 is sent in the horizontal direction following the grooves on the record.

Therefore, the slit plate 5 also rotates further clockwise.

When the arm 1 reaches the end position of playing the 30 cm record, the slit plate 5 is in a state immediately after the end 7□ of the play hole 7 for the 30 cm record has passed through the photocoupler 14.

That is, in the photocoupler 14, the light-receiving element 23 changes from a light-receiving state to a non-light-receiving state.
The terminal end 7□ of the play hole 7 for m record is detected.

Furthermore, it is thereby detected that the arm 1 has reached the playing end position of the 30 cm record disc.

After the arm 1 has reached the end position of the 30 cm record and finished playing, it is basically driven horizontally to return to the rest position, and is further lowered onto a rest stand (not shown).

When the arm 1 returns to the horizontal position, the slit plate 5 is reversed counterclockwise in FIG.

Then, when the arm 1 returns to the rest position, the rest hole 6 is detected again by the photocoupler 12.

Furthermore, it is thereby detected that the arm 1 has returned to the rest position (rest position).

Now, as mentioned above, the slit plate 5 is rotated forward and reverse together with the arm 1, but when it is reversed, in this case, the terminal end 7° of the 30cIrL record play hole 7 is the starting end, and the starting end is 71 is the terminal and the photocoupler 14
is detected.

Therefore, regardless of whether the slit plate 5 rotates normally or reversely, the starting end 7
It is necessary to identify 1 as the starting end and the ending end 72 as the ending end.

Therefore, a termination detection hole 9 is formed on the slit plate 5, and a photocoupler 13 for detecting this termination detection hole 9 is provided.

That is, the end detection hole 9 is detected by the photocoupler 13 before and after the end 7□ of the play hole 7 for a 30 cm record disc is detected by the photocoupler 14.

In other words, the end 7° of the play hole 7 for a 30 cm record is detected when the end detection hole 9 is detected by the photocoupler 13.

Therefore, when the end (terminal end 7□) of the 30CrrL record play hole 7 is detected in a state where the end detection hole 9 is detected by the photocoupler 13, that end is determined to be the end end 7□.

On the other hand, it goes without saying that the starting end of the play hole 7 for a 30 cm record disc is detected by the photocoupler 14 in a state where the end detection hole 9 is not detected by the photocoupler 13.

Therefore, when the end detection hole 9 is not detected by the photocoupler 13, the end (
Starting end7. ) is detected, that end is determined to be the starting end 71.

The above operation description is for play hole 7 for a 30cm record.
Although the photo coupler 14 was used, the same applies to the play hole 8 for a 17 cm record and the photo coupler 15 in the hole.

Further, in the above embodiment, a photocoupler 12 for detecting the rest hole 6 and a photocoupler 13 for detecting the end detection hole 9 are held on the first movable adjustment arm 10, and each photocoupler 13 is held on the second movable adjustment arm 11. Play holes 14.15 are retained.

Therefore, the timing at which the rest hole 6 is detected by the photocoupler 12 and the actual position of the arm 1 are adjusted by rotating the first movable adjustment arm 10.

Further, the timing at which the play holes 7 and 8 are detected by the photocouplers 14 and 15 and the actual position of the arm 1 are adjusted by rotating the second movable adjustment arm 11.

Further, the movable adjustment arm 10.11 is pivotally supported concentrically with the slit plate 5, and the photocoupler holder 16.1
7 is attached to the movable adjustment arm 10.11, so that each photo coupler 12.13 and 14.15 is positioned on the straight line 11.1° connecting the fulcrum of the slit plate 5 (horizontal arm axis 2). Adjustment arms 10, 11 and photocoupler holder 16.17 are positioned in advance and retaining portions 18.19 are formed at a plurality of locations for positioning, respectively;
The optocoupler holder 16.17 is configured to be attached to the movable adjustment arm 10.11 with the mutual engagement portions 18.19 engaged, so that the movable adjustment arm 10.11 can be rotated. The trajectories of the photocouplers 12, 13 and 14, 15 at this time coincide with the trajectories of the rest hole 6, end detection hole 9, and play holes 7, 8 of the rotating slit plate 5.

As detailed above, according to this invention, on the slit plate,
A rest hole, a play hole whose start end corresponds to the play start position of the record and whose end corresponds to the play end position, and an end detection hole for determining the end of the play hole, as well as a movable adjustment arm and a photocoupler holding Positioning engaging parts are formed at multiple predetermined locations on each of the parts, and the photocoupler holder is attached to the movable adjustment arm with the mutual retaining parts engaged. Although it has a simple configuration, the start and end of the play hole can be determined regardless of whether the slit plate rotates forward or backward, and operations such as starting and ending the play of a record are reliable. This has the effect that the photocoupler holder can be easily and quickly attached without causing any displacement of the photocoupler.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of an arm horizontal position detection device for a record player according to this invention, and FIG.
It is a cross-sectional view taken along the line ■-■ in the figure and shown together with the arm. 1...Arm, 2...Arm horizontal axis,
5... Slit plate, 6-9... Hole, 1
0,11...Movable adjustment arm, 12-15...
...Photocoupler, 16°17...Photocoupler holder, 18, 19...Engaging portion. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The horizontal position of the arm of the record player is maintained by a plurality of photocoupler holders on a slit plate that rotates as the arm rotates and a movable adjustment arm that is pivotally supported concentrically with the slit plate. In a device that optically detects a hole formed in a slit plate using a photocoupler, the hole is a rest hole corresponding to the rest position of the arm, and a starting end corresponding to the playing start position of the record and a terminal end. consists of a play hole corresponding to the play end position and an end detection hole that determines the end of this play hole, and a photocoupler that detects these holes maintains a predetermined positional relationship with the hole of the slit plate. Positioning retaining parts are formed at multiple predetermined locations on the movable adjustment arm and the photocoupler holder, respectively, and the photocoupler holder is attached to the movable adjustment arm with the mutual engagement parts engaged. An arm horizontal position detection device for a record player, characterized in that: