JP2570998Y2 - Vibration reduction device for transfer feeder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing vibration of a transfer feeder employing a vacuum transfer system.

[0002]

2. Description of the Related Art Conventionally, a transfer press is provided with a transfer feeder for carrying in and out a work and transferring the work between processing stations. However, a transfer press transfers a large work such as a panel or a work having low rigidity. In such a case, a transfer feeder adopting a vacuum transport method is used. In the transfer feeder adopting the above-described vacuum transport system, a plurality of crossbar carriers are movably provided in a feed direction on a lift bar which is moved up and down by a lift mechanism, and a crossbar suspended between these crossbar carriers is provided. Is provided with a vacuum cup for adsorbing a work. Further, in the above-described transfer feeder, when the crossbar vibrates during operation, a misfeed occurs in which the vacuum cup attached to the crossbar fails to suck the work.

For this reason, conventionally, the crossbar is formed of carbon fiber reinforced plastic to reduce the vibration by increasing the weight and rigidity, or the vibration of the crossbar is reduced by supporting the lift beam at multiple points. Such methods have been proposed.

[0004]

[Problem to be solved by the invention] However, transfer
The vibration that occurs during operation of the
Vibration on the crossbar side because the long lift bar side is large
Vibration on the lift bar side is transmitted to the crossbar
When misfeed occurs and the crossbar is made of carbon fiber reinforced plastic as in the past,
In this case, there is a problem that the apparatus itself becomes expensive. In addition, since the structure in which the lift bar is supported at multiple points is complicated, the apparatus itself is expensive.
The present invention has been made for the purpose of improving the above-mentioned problem, and an object of the present invention is to provide a transfer feeder vibration reducing device capable of efficiently reducing the crossbar vibration.

[0005]

According to the present invention, in order to achieve the above object, a plurality of crossbar carriers are movably provided on a pair of lift bars arranged side by side in a work feed direction, and crossbars facing each other are provided. The lift bar was moved up and down in a transfer feeder in which a crossbar on which work suction means was attached was placed between carriers .
In this case, a dynamic vibration absorber is attached near a location where vibration displacement is the largest .

[0006]

[ Operation ] With the above configuration, the transfer feeder
During operation, the position of the largest vibration displacement of the lift bar
Lift bars can absorb vibrations efficiently.
Vibration can be greatly reduced,
Feeding can be reliably prevented.

[0007]

[Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a transfer press equipped with a transfer feeder, and FIG. 2 is a front view of the transfer press. In these figures, reference numeral 1 denotes a press body, which has a plurality of uprights 1a in front and back, and a pair of lift bars 2 is provided between the uprights 1a in a work feed direction (direction of arrow A).
Are installed side by side. These lift bars 2 are lift mechanisms 3
The lift bar 2
A plurality of crossbar carriers 4 are movably mounted on the upper side at equal intervals in the feed direction A. The crossbar carriers 4 are connected to each other, are adapted to be moved forward and backward in the feed direction A by a feed mechanism (not shown) installed on the downstream side, and are provided at positions opposed to each other. A crossbar 5 is mounted on the carrier 4. A vacuum cup 7 for adsorbing the work 6 is attached to the cross bar 5.

On the other hand, reference numeral 10 in the drawing denotes a dynamic vibration absorber installed at an intermediate portion of the lift bar 2. When the lift bar 2 moves up and down during operation, the dynamic vibration absorber 10 is installed at, for example, four places as shown in FIG. 2 where the vibration displacement caused by the elastic deformation of the lift bar 2 is largest, and is shown in FIG. It is configured as follows. That is, the dynamic vibration absorber 10
The mass 12 is accommodated in the lift bar 2 so as to be vertically movable. The mass 12 is set to a weight of about 10% of the weight of the lift bar 2 and has a substantially rectangular shape.
Both end surfaces are in sliding contact with the damping member 16 attached to the inner surface of the lift bar 2. Further, four concave portions 12a and 12b are formed on the upper and lower surfaces of the mass 12, respectively, and a compression spring 13 formed of a coil spring is accommodated in each of the concave portions 12a and 12b.

The compression spring 1 housed in the upper recess 12a
The upper end of 3 is in contact with the upper surface plate 2a of the lift bar 2 from below, and the compression spring 13 housed in the lower recess 12b is in contact with the spring seat 15 attached to the lower end of the mounting bolt 14. I have. The mounting bolt 14 is inserted into the lift bar 2 through a through hole 2c having a smaller diameter than the spring seat 15 opened in the lower plate 2b of the lift bar 2, and the upper end is inserted into an insertion hole 12c formed in the mass 12. The rear upper end portion is screwed to the upper surface plate 2a from below. By tightening the nut 14a so that the spring seat 15 closes the through hole 2c of the lower plate 2b, a mounting load can be applied to each compression spring 13.

Next, the operation will be described.
The dynamic vibration absorbers 10 having a predetermined mounting load applied to each of the compression springs 13 by tightening the nuts 14a are mounted on the lift bar 2 and are provided for operation. When the lift bar 2 vibrates, the mass 12 of the dynamic vibration absorber 10 vibrates up and down with this vibration to absorb the vibration of the lift bar 2, and the absorbed vibration energy is transmitted to the damping member 16 provided on the inner surface of the lift bar by the mass 12. It is attenuated by the friction when sliding. The spring constant of the compression spring 13 used in the dynamic vibration absorber 10 is set to be equal to the natural frequency of the lift bar 2 to be damped, or set near the low frequency side. Further, by reducing the vibration of the lift bar 2, the vibration of the cross bar 5 laid on the lift bar 2 can be significantly reduced.

FIGS. 5 to 7 show vibration waveforms of the crossbar 5 when the dynamic vibration absorber 10 is used and when the vibration absorber 10 is not used. Is a diagram. FIG. 5 shows the case where the number of feed strokes is 8 spm (stroke / minute), ( b ) shows the vibration acceleration and vibration displacement of the crossbar 5 without the dynamic vibration absorber 10 attached to the lift bar 2, and ( b ) Shows waveforms of vibration acceleration and vibration displacement of the cross bar 5 with the dynamic vibration absorber 10 attached. The 6 feed stroke number is 10Spm, in the case of FIG. 7 is the number of feed strokes 12Spm, both (b) the dynamic absorber 1
State not mounted to 0, (b) shows the waveform of a state of attaching the dynamic vibration reducer 10, a cross bar 5 in both cases
Uses equivalent products. On the other hand, Fig. 8 (a) to (f)
Shows the results of measuring the vibration reduction effect in each step, and it was confirmed that the vibration reduction effect was remarkable in the lift direction (FIGS. 8F and 8E).

[0012]

[Effect of the invention] This invention is, as described in detail above, a lift.
When the bar is moved up and down, there is a place where the vibration displacement is the largest
Since the dynamic vibration absorber was installed nearby, the transfer fee
During operation of the lifter, the lift bar with the largest vibration displacement
Lift can be efficiently absorbed
Vibration of the bar and the crossbar mounted on it is greatly reduced
Can be reduced . This ensures feed mistakes
In addition to providing the required number of dynamic vibration absorbers on the lift bar, it is necessary to provide a conventional crossbar at a lower cost than forming a carbon fiber reinforced plastic or increasing the number of support points for the lift bar. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view of a transfer feeder employing a vibration reduction device according to an embodiment of the present invention.

FIG. 2 is a front view of a transfer feeder employing a vibration reduction device according to an embodiment of the present invention.

FIG. 3 is an enlarged plan view of the dynamic vibration absorber used in the vibration reduction device according to one embodiment of the present invention.

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

FIGS. 5A and 5B are diagrams illustrating a vibration reduction effect. FIG.

FIGS. 6A and 6B are diagrams illustrating a vibration reduction effect. FIG.

FIGS. 7A and 7B are diagrams illustrating a vibration reduction effect. FIG.

FIGS. 8A to 8F are diagrams showing a vibration reduction effect in each step.

[Explanation of symbols]

2 transfer bar, 4 feed carrier, 5 cross bar, 10 dynamic absorber, 12 mass, 13 compression spring.

Continuation of the front page (56) References JP-A-3-57498 (JP, U) JP-A 1-165132 (JP, U) Jiko 62-43680 (JP, Y2)

Claims (2)

(57) [Scope of request for utility model registration] A plurality of crossbar carriers are movably provided on a pair of lift bars arranged side by side in a work feed direction, and a work suction means is mounted between the crossbar carriers facing each other. In the transfer feeder having the cross bar 5 suspended, the lift bar 2
Near the point where vibration displacement is greatest when
And a vibration reducer for a transfer feeder having a dynamic vibration absorber 10 attached thereto. 2. A vibration according to claim 1, wherein said dynamic vibration absorber comprises a vertically movable mass slidably contacted by a damping member, and a compression spring for elastically supporting said mass in a vertical direction. Reduction device.