JP3122657B1 - Pneumatic balancer - Google Patents

Abstract

An object of the present invention is to effectively use a load sensor originally provided in an air-type balancer to easily change a height position of a work held by the balancer. SOLUTION: An air cylinder 5 is connected to a post 3 and a work holding member 4 pivotally connected to the post 3,
Further, the work holding member 8 is provided on the work holding member 4 via a load sensor 7 that generates an air pressure proportional to the load weight of the work W, and the proportional pressure generated from the load sensor 7 is set as a pilot pressure. An air pilot type pressure reducing valve 17 for adjusting the air pressure of the main circuit 18 to the air cylinder 5 according to the pilot pressure is provided so as to maintain the work W at a predetermined height while maintaining a balance. In the pneumatic balancer having the above configuration, an external force applying means 20 for applying and externally adding and externally applying an external force to the load sensor 7 is provided so that the pilot pressure generated by the load sensor 7 can be artificially adjusted. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a pneumatic balancer using a load sensor.

[0002]

2. Description of the Related Art As the above-mentioned air balancer, a work holding member is pivotally attached to a post so as to be vertically swingable, and an air cylinder is connected between the work holding member and the post. The member is provided with a work holder through a load sensor that generates air pressure proportional to the load weight of the work, while the proportional pressure generated from the load sensor is used as pilot pressure, and the pilot pressure is applied to the air cylinder in accordance with the pilot pressure. includes an air pilot type pressure reducing valve for adjusting the air pressure of the main circuit, so as to hold while maintaining a balanced work at a predetermined height position structure
There are those formed.

[0003] Specifically, the air pilot pressure reducing valve holds an air pressure (hereinafter, referred to as a set pressure) corresponding to the pilot pressure, and passes the air pressure through a main circuit to lift the work of the air cylinder on the work lifting side. (Hereinafter simply referred to as a cylinder chamber), and has a function of maintaining the balance of the work holder at a predetermined height position irrespective of the presence or absence of the work and the fluctuation of the load weight.

In addition, this air pilot type pressure reducing valve supplies pressurized air to the cylinder chamber so that the cylinder chamber returns to the set pressure when the cylinder chamber is depressurized by lifting the work holding member. When the cylinder chamber is pressurized as the work holding member is depressed, the cylinder chamber has a function of releasing pressurized air to return the cylinder chamber to the set pressure. Therefore, the position of the work can be changed to an arbitrary height position by manually lifting or pushing down the work holding member.

[0005]

However, in the above-mentioned air-type balancer, although the load weight of the work is balanced, when the height position of the work is changed, the starting resistance of the air cylinder is changed. There is a problem in that a strong operation force is required at the time of starting the position change due to the pressure and mechanical resistance.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a purpose of the present invention is to effectively use a load sensor originally provided, and not only to use the load sensor for balance but also to use an air cylinder. In other words, the work holding member can be moved up and down by an air cylinder so that the height position of the work can be easily changed.

[0007]

To achieve the above object of the Invention The present invention is provided with an external force applying means for applying to artificially increase or decrease the external force to the load sensor, the pilot <br/> Pressure can be artificially adjusted, and the load sensor
Not only for balance but also for forced operation of air cylinder
It is characterized in that it can be used together as an action switch .

According to the above configuration, if an external force is artificially applied to the load sensor so as to increase the pilot pressure , the balance with the actual load weight of the work is lost. In order to maintain the balance, the air pressure of the main circuit to the air cylinder is adjusted to be high according to the pilot pressure, whereby the work holding member is forcibly forced by the air cylinder during the application of an artificial external force. Will be lifted.

On the other hand, to decrease the pilot pressure ,
When an external force is artificially applied to the load sensor, this also causes the balance with the actual load weight of the work to be lost, and the air pilot type pressure reducing valve adjusts the air pressure of the main circuit to the air cylinder to low. Thus, the work holding member is thereby kept
It will be forced down by the air cylinder.

That is, according to the present invention, the load sensor is provided with external force applying means for applying and externally adjusting the external force, and the work holding member is forcibly moved up and down by an air cylinder. Not only for balance but also for forced operation of air cylinder, the height position of the work can be changed easily.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show, for example, a pneumatic balancer mounted on a seat assembly line of an automobile.
A post 3 is suspended from a rotating means 2 with a built-in bearing, and a work holding member 4 is pivotally mounted on the lower side of the post 3 so as to form a parallel quadruple link with the post 3.

While the air cylinder 5 is connected across the work holding member 4 and the post 3, a load sensor 7 is provided in association with the vertical link 6 on the free end side of the work holding member 4 comprising a parallel quadruple link. Further, a work holder (in this embodiment, the work W is an automobile seat) in association with the load detecting portion of the load sensor 7.
Is provided.

More specifically, as shown in FIGS. 3 to 5, a channel member 9 is attached to the vertical link 6 of the work holding member 4.
And the upper flange 10 of the channel member 9
A handle 11 for raising and lowering the work holding member 4 is provided, a load sensor 7 is further suspended from the upper flange 10, and, for example, two guide rods 13, A plate member 15 is vertically connected to a total of four cylindrical members 14, which are vertically guided along the guide rods 13, 13.

A plate-like member 16 is horizontally connected to the surface of the plate-like member 15 on the side of the work holding member 4, and the plate-like member 16 is connected to the load detecting portion of the load sensor 7. As shown in FIG. 1, a work holder 8 for locking and holding the work W from above is provided on the other side surface of the plate-like member 15 so as to be able to be pulled out laterally of the work W.

The load sensor 7 has a function of generating an air pressure proportional to the load weight of the work W. on the other hand,
A main circuit 18 for air from an air pilot pressure reducing valve 17 is connected to a cylinder chamber on the work lifting side of the air cylinder 5. Incidentally, reference numeral 19 in the drawing denotes a high-pressure air supply means.

The above air pilot type pressure reducing valve 17 is
The proportional pressure generated from the load sensor 7 is used as a pilot pressure, and the air pressure of the main circuit 18 to the air cylinder 5 is adjusted in accordance with the pilot pressure to maintain the work W at a predetermined height while maintaining a balance. Has functions.

Further, the air pilot type pressure reducing valve 17
When the cylinder chamber is depressurized as the work holding member 4 is lifted, pressurized air is supplied to the cylinder chamber so as to return the cylinder chamber to the set pressure. Has a function of releasing pressurized air to return the cylinder chamber to the set pressure when the pressure is increased.

Therefore, according to the pneumatic balancer having the above structure, the work holder 8 can be slid and rotated in the two-dimensional horizontal direction via the base 1 and the rotating means 2, and the work holding member can be rotated. Since the height position of the work W can be arbitrarily changed by artificially lifting or pushing down the work 4, the work (seat) W into the body before the door is mounted on, for example, a seat assembly line of an automobile. And the work of pulling out the work holder 8 to the side of the work W can be easily performed.

In the pneumatic balancer having the above structure, the load weight of the work W is balanced, but when the height position of the work W is changed, the starting resistance of the air cylinder 5 and the mechanical resistance are changed. As described above, a strong operation force is required particularly at the time of starting the position change due to the mechanical resistance and the like.

Therefore, in the present invention, the load sensor 7 is provided with external force applying means 20 for applying and externally adjusting the external force, so that the pilot pressure can be artificially adjusted and adjusted, thereby holding the workpiece. The member 4 is forcibly moved up and down by the air cylinder 5 so that the height position of the work W can be mechanically and easily changed.

[0021] Specifically, in this embodiment, the external force applying means 20, a first force applying means 20A for increasing the pilot pressure artificially, second external force to reduce the pilot pressure artificially And an application means 20B.

The first external force applying means 20A is provided with a grip lever 2 on one end side of a raising / lowering handle 11 provided on the work holding member 4.
1 and the fastener 24 for the inner wire 23 of the push-pull wire 22 is provided on the lower flange 12 of the channel member 9.
Among them, the fastening member 26 of the outer wire 25 is provided on the plate-shaped member 15 connected to the load sensor 7, and the outer wire 25 is provided over the fastening member 26 and the pivotal attachment member 27 of the grip lever 21. The inner wire 23 is secured to the other fastening tool 24 and the grip lever 21.

The second external force applying means 20B is formed by fixing a gripping lever 28 to the plate-like member 15 so as to face the other end of the raising / lowering handle 11.

According to the first external force applying means 20A having the above structure, the fingers are hooked on the raising / lowering handle 11 and the gripping lever 21, and the gripping lever 21 is pulled toward the lifting / lowering handle 11 side. When the grip 21 is gripped, the fastening pressure of the inner wire 23 by the grip lever 21 is pushed down by the fastener 26 of the outer wire 25 and thus the plate-like member 15, so that the pilot pressure is applied to the load sensor 7. External force is artificially applied.

When the pilot pressure increases in this way, the balance with the actual load weight of the work W is lost, so that the air pilot pressure reducing valve 17 causes the main circuit to the air cylinder 5 to respond to the increased pilot pressure. Since the air pressure of 18 is adjusted to be high, the work holding member 4 and thus the work W are forcibly lifted by the air cylinder 5 while the external force is artificially applied.

On the other hand, according to the second external force applying means 20B, the fingers are hooked on the raising / lowering handle 11 and the gripping lever 28, and the gripping lever 28 is pulled up to the raising / lowering handle 11 side. When the gripping operation is performed, the plate-like member 15 is pulled up by an amount corresponding to the lifting operation amount of the gripping lever 28, so that an external force for reducing the pilot pressure is artificially applied to the load sensor 7.

As a result, the balance with the actual load weight of the work W is lost, so that the air pilot pressure reducing valve 17 adjusts the air pressure of the main circuit 18 to the air cylinder 5 to a low value according to the reduced pilot pressure. Therefore, the work holding member 4 and thus the work W are forcibly pushed down by the air cylinder 5 while the external force is artificially applied.

In any of the first and second external force applying means 20A, 20B, when the application of the artificial external force is removed, the air is applied in accordance with the pilot pressure proportional to the actual load weight of the work W. Pilot type pressure reducing valve 17
However, by adjusting the air pressure of the main circuit 18 to the air cylinder 5, the work W is held in a balanced state at the changed height position.

In summary, an external force is artificially applied to the load sensor 7 so that the load sensor 7 is used not only for balance but also as a switch for forcibly operating the air cylinder 5. The work holding member 4 is provided with an air cylinder 5.
As a result, the height position of the work W can be easily changed.

In the first external force applying means 20A,
As shown by an imaginary line in FIG. 3, when the grip lever 21 is not operated, the grip lever 21 is configured to have play in a direction opposite to the grip direction, so that the workpiece W with respect to the workpiece holder 8 is moved. The load detecting operation of the load sensor 7 at the time of loading / unloading and the operation of the grip lever 28 by the second external force applying means 20B are not hindered.

FIG. 6 shows an external force applying means 20 according to another embodiment. The external force applying means 20 according to this embodiment is provided with a rack gear 29 on the surface of the plate-like member 15 on the side of the workpiece holding member 4, while connecting a bracket 30 to the channel member 9, and Fan-shaped pinion gear 31 meshing with the rack gear 29
And the operation lever 3 is attached to the pinion gear 31.
2 are connected in series.

According to the external force applying means 20 having the above-described structure, when the operation lever 32 is swung upward, the plate-like member 15 is pushed down, whereby the load sensor 7 receives an external force for increasing the pilot pressure. When the operation lever 32 is pivoted downward, the plate-like member 15 is lifted upward, and an external force for reducing the pilot pressure is artificially applied to the load sensor 7. Will be.

Therefore, the work holding member 4 can be forcibly moved up and down by the air cylinder 5 by using the load sensor 7 in combination with the forcible operation switch of the air cylinder 5 also by the external force applying means 20 having such a configuration. The feature is that the work holding member 4 is moved up and down by one operating lever 32 in relation to the operating direction of the operating lever 32.

In the external force applying means 20 having such a configuration, the operation lever 32 swings along with the elevation of the plate member 15 and via the rack gear 29 and the pinion gear 31, so that the work holder The load detecting operation of the load sensor 7 when the work W is put on and off the work 8 is not hindered at all.

[0035]

As described above, the present invention is provided with an external force applying means for effectively utilizing the load sensor originally provided in the pneumatic balancer and applying an external force to the load sensor artificially. , The work holding member can be forcibly moved up and down by an air cylinder.
The height position of the work can be easily changed by using the switch for forced operation of the air cylinder.

[Brief description of the drawings]

FIG. 1 is a front view of a pneumatic balancer.

FIG. 2 is a side view of the pneumatic balancer.

FIG. 3 is a plan view of a work holding member shown together with first and second external force applying means.

FIG. 4 is an end view of a work holding member from which a plate member for mounting the work holding tool is omitted.

FIG. 5 is a side view showing a mounting structure of the load sensor.

FIG. 6 is a side view of an external force applying unit according to another embodiment.

[Explanation of symbols]

Reference numeral 3 represents a post, 4 represents a work holding member, 5 represents an air cylinder, 7 represents a load sensor, 8 represents a work holder, 17 represents an air pilot pressure reducing valve, and 20 represents external force applying means.

Claims (2)

(57) [Claims] A work holding member is pivotally mounted on a post so as to be vertically swingable, an air cylinder is connected between the work holding member and the post, and a load weight of the work is attached to the work holding member. The work holder is provided via a load sensor that generates air pressure proportional to the pressure, while the proportional pressure generated by the load sensor is used as pilot pressure, and the air pressure of the main circuit to the air cylinder is adjusted according to this pilot pressure. An air-type balancer comprising an air-pilot-type pressure reducing valve to maintain a work at a predetermined height while maintaining a balance, in which an external force is artificially applied to the load sensor. provided with an external force application means for said pilot pressure artificially acceleration adjustable constitute a balun load sensor
For forced operation of air cylinders
An air-type balancer that is configured to be used together as a switch . 2. The pneumatic balancer according to claim 1, wherein the external force applying means comprises a first external force applying means for increasing the pilot pressure and a second external force applying means for decreasing the pilot pressure.