JPH06123283A - Air pump device - Google Patents

Abstract

PURPOSE:To obtain an air pump device wherein a driving motor or an air cylinder is easily attached and detached. CONSTITUTION:An air pump device is composed of a driving motor 1, an air cylinder 2 driven by the driving motor 1 for intake and discharge on a running passage of a tape, an installation plate 3, screws 4 and 6 for connecting the driving motor 1 to the air cylinder 2, an eccentric frame 9 journalled eccentrically to a driving shaft 8 of the driving motor 1, a bearing 10 arranged on an outer periphery of the eccentric frame 9, a shaft 20 whose one end is abutted against an outer peripheral end surface of the bearing 10, the other end is abutted against a piston 12 of the air cylinder 2, and a compression coil spring 19 which presses the shaft 20 against the outer peripheral end surface of the bearing 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pump device suitable for use in a tape running system for cleaning the tape surface and guiding the tape with air in a video tape recorder, for example.

[0002]

2. Description of the Related Art Conventionally, an air pump device used in a tape running system of a video tape recorder is shown in FIGS.
It has a configuration as shown in. Reference numeral 21 is a drive motor, and the first side of the connecting plate 22 has a side surface bent in a crank shape.
The air cylinder 23 is fixed to the mounting surface, and the air cylinder 23 is detachably screwed to the adjacent second mounting surface with screws 24 to 25. The drive shaft 26 of the drive motor has an eccentric top 27.
Is mounted on the crankshaft 2
The bearing 30 is fitted and inserted into the ring 29 provided at one end of the bearing 8.
1, the play in the thrust direction is eliminated.

A piston 32 is detachably attached to the other end of the crankshaft 28 by a screw 33. 34
Is an intake valve and is in communication with the intake port 35, and 36 is an exhaust valve and is in communication with an exhaust port 37. The air pump device of the conventional video tape recorder described above has the following actions. The rotational movement of the drive motor 21 is converted into the forward / backward movement of the piston 32 via the eccentric top 27, the bearing 30, and the crankshaft 28, and the piston 32 is moved.
Due to the advancing / retreating movement of the tape, air is taken in or exhausted at the air intake port 35 or the air exhaust port 37 arranged on the tape traveling path.

[0004]

However, in the above-described device, when the drive motor 21 is removed due to a failure or the like, the eccentric piece 27 is mounted on the ring 29 provided at one end of the crankshaft 28 and the bearing 30 is provided. Since it is inserted and inserted, the screws 24 to 25 are first removed to remove the air cylinder 23 from the connecting plate 22, and then the screw 33
To remove the piston 32 from the crankshaft 28, and then remove the eccentric piece 27 with the bearing 30 from the ring 29 of the crankshaft 28.
There is an inconvenience that the drive motor unit and the air cylinder unit cannot be released from each other, and the drive motor unit cannot be removed at least without disassembling the air cylinder unit. The present invention has been made in view of the above points, and an object thereof is to propose an air pump device for a tape traveling system in which a drive motor or an air cylinder can be easily attached and detached.

[0005]

An air pump device according to the present invention includes a drive motor 1 as shown in FIGS. 1 and 2, for example.
An air cylinder 2 driven by a drive motor 1 for performing intake and exhaust on a tape traveling path, and connecting means 3, 4 for connecting the drive motor 1 and the air cylinder 2 to each other.
5, 6, and 7, an eccentric piece 9 eccentrically attached to the drive shaft 8 of the drive motor 1, one end abuts the outer peripheral end surface of the eccentric piece 9, and the other end is a piston of the air cylinder 2. The shaft 20 is in contact with the shaft 12, and the pressing means 19 presses the shaft 20 against the outer peripheral end surface of the eccentric piece 9.

Further, according to the present invention, in the above description, the connecting means 3, 4, 5, 6, 7 are the drive motor 1 and the air pump 2.
And drive motor attachment / detachment portions 3, 4, 5 and air cylinder attachment / detachment portions 3, 6, 7 which have attachment / detachment paths that do not interfere with each other. Further, in the present invention described above, the eccentric piece 9 is
A bearing 10 is provided on the outer periphery of the bearing and abuts on the shaft 20 via the bearing 10.

[0007]

According to the present invention, the bearing 10 has the shaft 2
0, and the shaft 20 is in contact with the piston 12, the eccentric rotation of the bearing 10 causes the piston 12 to rotate.
Goes back and forth.

Further, according to the present invention, the drive motor 1 or the air cylinder 2 is independently attached or detached. Further, the present invention is
The shaft 20 abuts on the bearing 10 provided on the outer periphery of the eccentric piece 9.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the air pump device of the present invention will be described in detail below with reference to FIGS. 1 and 2, the drive motor 1 and the air cylinder 2 have screws 4 to 5 and 6 to the adjacent first and second mounting surfaces outside the mounting plate 3 whose side surfaces are bent in an L shape. 7 is detachably screwed.

An eccentric piece 9 is attached to the drive shaft 8 of the drive motor 1, and a bearing 10 is provided on the outer peripheral surface of the eccentric piece 9. The bearing retainer 11 eliminates rattling in the thrust direction.

Inside the air cylinder 2, there is a piston 12
The first air chamber 13 and the second air chamber 14 are formed at the boundary, and the intake port 15 communicates with the first air chamber 13 via an intake valve 16 that is released into the first air chamber 13 at the time of intake. The chamber 13 communicates with the second air chamber 14 through an exhaust valve 17 that releases from the inside of the piston 12 into the second air chamber 14 when exhausted, and the second air chamber 14 is provided with an exhaust port 18.

A compression coil spring 19 is provided on the end surface of the piston 12 on the side of the second air chamber 14 to move the piston 12 to the first position.
It is elastically biased toward the air chamber 13. Piston 12
One end of the shaft 20 abuts on the end surface of the first air chamber 13 side, and the other end of the shaft 20 abuts the outer peripheral end surface of the bearing 10 interposed on the outer peripheral end surface of the eccentric piece 9 at point A. ing. At point A, due to the pressing force of the compression coil spring 19, the shaft 20 is only in contact with the outer peripheral end surface of the bearing 10 and is not connected.

Here, there is an eccentricity B between the drive shaft 8 and the bearing 10, and twice the B, that is, 2B, is the shaft 2.
The stroke amount is 0. In other words, the eccentricity amount is minimum at the advanced position of the shaft 20, and the eccentricity amount is maximum at the retracted position of the shaft 20, and the stroke until the shaft 20 retracts from the advanced position and returns to the advanced position again is two.
That is B.

The compression coil spring 19 is provided on the shaft 2
In addition to pressing 0 on the bearing 10, the piston 12 also presses the first air chamber 13 side to return the shaft 20 to the advanced position.

Since this example is constructed as described above,
When the drive shaft 8 rotates during pump driving, the eccentric top 9
The bearing 10 provided on the outer peripheral end surface of the shaft rotates eccentrically. Then, following this eccentric rotation, the shaft 20 moves back and forth with the eccentric amount 2B as the stroke amount.

At the time of maximum eccentricity, the shaft 20 is moved to the retracted position against the biasing force of the compression coil spring 19 while being in contact with the piston 12. At this time, the intake valve 16 is released into the first air chamber 13, and the intake port 15 is opened through the first air chamber 13
Air is inhaled inside. At the same time, the exhaust valve 17 is closed and the air in the second air chamber 14 is exhausted from the exhaust port 18.

At the time of minimum eccentricity, the shaft 20 moves to the advanced position according to the urging force of the compression coil spring 19 while being in contact with the piston 12. At this time, the intake valve 16 is closed, the exhaust valve 17 is released into the second air chamber 14, and the air in the first air chamber 13 is exhausted from the exhaust valve 17 through the second air chamber 14 through the exhaust port 18. It

By repeating the above operation, intake and exhaust can be repeated, and the intake port 15 and the exhaust port 1
8 can be arranged in a predetermined tape running path to guide the tape.

With the above-described structure, when the air cylinder portion is removed, the screws 6 to 7 are removed and the air cylinder portion is moved in a direction away from the mounting surface of the mounting plate 3 without causing any interference with the drive motor portion. Can be easily removed without.

When the drive motor unit is removed, the bearing 10 should not interfere with the mounting surface of the mounting plate 3.
Since the notch C is provided in the mounting plate 3, the screws 4 to 5
Can be easily removed without interfering with the air cylinder portion by simply removing the above and moving the drive motor portion in a direction away from the mounting surface of the mounting plate 3.

In the above-described embodiment, the piston type air cylinder is used. However, it goes without saying that the present invention can be applied to a diaphragm type air cylinder.

The above-described embodiment is an example of the present invention, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0023]

According to the present invention described above, the following effects can be obtained. According to the present invention, a drive motor, an air cylinder that is driven by the drive motor to perform intake and exhaust, connection means that connects the drive motor and the air cylinder, and an eccentric shaft of the drive motor. An eccentric piece mounted on the shaft, a shaft having one end abutting on the outer peripheral end surface of the eccentric piece and the other end abutting on the piston of the air cylinder, and a pressing means for pressing the shaft on the outer peripheral end surface of the eccentric piece. Therefore, the drive motor section and the air cylinder section can be made independent, so that the workability of assembling the air pump device can be improved.
Maintainability and reliability are improved, and downsizing is possible. Further, according to the present invention, in the above-mentioned invention, the connecting means includes the motor attaching / detaching portion and the air cylinder attaching / detaching portion having the attaching / detaching paths that do not interfere with each other between the drive motor and the air cylinder. Sometimes it can be removed without moving the air cylinder part by simply moving the drive motor part away from the motor attachment / detachment part.When removing the air cylinder part, the air cylinder part can be removed without any interference with the drive motor part. It can be removed simply by moving it away from the attachment / detachment part. Further, according to the present invention, in the above-mentioned invention, since the eccentric piece has the bearing on the outer periphery thereof and abuts on the shaft via the bearing, the reliability is improved.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of an air pump device of the present invention.

FIG. 2 is an arrow D diagram in which the bearing retainer of the embodiment of the air pump device of the present invention shown in FIG. 1 is omitted.

FIG. 3 is a partial cross-sectional view of a conventional air pump device.

FIG. 4 is an arrow E diagram in which the bearing retainer of the conventional air pump device shown in FIG. 3 is omitted.

[Explanation of symbols]

 1 Drive Motor 2 Air Cylinder 3 Mounting Plate 4, 5, 6, 7 Screw 8 Drive Shaft 9 Eccentric Top 10 Bearing 12 Piston 19 Compression Coil Spring 20 Shaft

Claims (3)

[Claims] 1. A drive motor, and an air cylinder driven by the drive motor to perform intake and exhaust.
Connecting means for connecting the drive motor and the air pump, an eccentric piece eccentrically attached to the drive shaft of the drive motor, one end abutting on the outer peripheral end surface of the eccentric piece, and the other end. Is composed of a shaft that comes into contact with the piston of the air cylinder, and a pressing unit that presses the shaft against the outer peripheral end surface of the eccentric piece. 2. The air according to claim 1, wherein the connecting means comprises a drive motor attaching / detaching portion and an air cylinder attaching / detaching portion having attachment / detachment paths that do not interfere with each other between the drive motor and the air cylinder. Pump device. 3. The air pump device according to claim 1, wherein the eccentric piece has a bearing on the outer circumference thereof, and abuts on the shaft via the bearing.