JPH0417296Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a material support device for a shearing machine that cuts materials such as sheet materials.

Conventional technology A shearing machine that presses the material onto the lower part of the main body equipped with a lower blade with a presser piece, lowers the upper blade provided on a vertically moving ram attached to the upper part of the main body, and cuts the material with the upper and lower blades. When cutting a long thin material, the material protrudes laterally beyond the lower blade, so a material support for supporting this protruding portion is provided at the bottom of the main body so as to be movable up and down.

Problems to be Solved by the Invention This material support is in a supporting position when setting the material, but it gets in the way when cutting, so when the material is pressed onto the main body with the presser piece, it descends before the ram descends. As a result, the material cannot be supported during cutting, and the protruding parts of the material sag under its own weight, resulting in poor cutting accuracy. For example, the cut surface may no longer be square, or the material may become bent near the end of the cut.

Means and operation for solving the problem A telescopic switching valve that supplies air to one of the expansion chamber and contraction chamber of the cylinder that moves the material support up and down, and an air discharge path from the expansion chamber of the cylinder are connected to the first and second expansion chambers. A speed switching valve is provided that communicates with one of the two flow rate adjustment valves, and when cutting, the air from the expansion chamber of the cylinder is discharged through the first flow rate adjustment valve, thereby slowing down the descending speed of the material support and synchronizing with cutting. After the cutting is completed, the air from the expansion chamber of the cylinder is discharged through the second flow rate adjustment valve, increasing the descending speed of the material support and allowing it to descend rapidly.

Embodiment A lower blade 2 is provided in the lower part 1 of the main body, and a lower blade 2 is provided in the upper part 3 of the main body.
A ram 5 equipped with an upper blade 4 and a presser piece 6 are first,
It is provided to be movable up and down by second cylinders 7 and 8, and a material support 9 is provided on the lower part 1 of the main body on a horizontal shaft 10.
It is mounted so as to be vertically movable between a horizontal support position that is substantially the same as the upper surface of the lower blade 2 and a retracted position below the material receiver 11 that is attached to the lower part 1 of the main body with a downward slope. , a cylinder 13 is pivotally connected to the arm 12 fixed to the horizontal shaft 10 and the lower body 1, and when the cylinder 13 is at the end of its extension stroke, it is in the supporting position, and when it is at the end of the contraction stroke, it is in the retracted position. It is designed so that

The expansion chamber 13a and the contraction chamber 13b of the cylinder 13 are connected to the first and second ports 15 and 16 of the telescopic switching valve 14, as shown in FIG.
7 is connected to the factory airline 18, and the fourth port 1
9 is connected to the inlet port 21 of the speed switching valve 20,
The fifth port 22 opens to the atmosphere via a muffler 23.

First and second outlet ports 2 of the speed switching valve 20
4 and 25 are connected to the muffler 28 via the first and second flow rate regulating valves 26 and 27, respectively, and are held in the first position communicating the inlet port 21 and the first outlet port 24 by the spring 29, and the solenoid 20a is When energized, the inlet port 21 and the second outlet port 25 are switched to the second position communicating with each other, and the first and second flow rate regulating valves 26 and 27 short-circuit the front and rear of the variable throttles 26a and 27a with the check valves 26b and 27b. I did it,
The flow rate is determined by the variable throttles 26a and 27a.

Then, when the material A is set and pressed with the presser piece 6 and the ram 5 is lowered to start cutting with the upper blade 4 and the lower blade 2, the switch for detecting the lowering position of the ram 5 or the holding of the first cylinder 7 is activated. The start of cutting is detected by the rise in pressure, and the first solenoid 14 ₁ of the telescopic switching valve 14 is energized to the retracted position B using the signal.

As a result, the air in the factory airline 18 is supplied to the contraction chamber 13b of the cylinder 13, and the air in the expansion chamber 13a passes through the first port 15, the fourth port 19, the inlet port 21, and the first outlet port 24. The flow rate is regulated by the flow rate regulating valve 26 and discharged into the atmosphere from the muffler 28, the cylinder 13 is contracted, and the material support 9 is lowered. As a result, the upper blade 4 and the lower blade 2 start cutting the material A.

The descending speed at this time is determined by the throttle of the throttle 26a, and the throttle of the throttle 26a is set so that the descending speed of the material support 9 is the same as the cutting speed.

Then, the completion of cutting is detected by the stroke of the ram 5, the holding pressure, or a timer, and the solenoid 20a is energized by the signal, the speed switching valve 20 is set to the second position, and the air in the expansion chamber 13a is switched to the second position. It is discharged into the atmosphere from the muffler 28 through the two flow rate adjustment valves 27.

At this time, the throttle 27a of the second flow rate adjustment valve 27 is larger than the throttle 26a of the first flow rate adjustment valve 26 to allow a large amount of air to flow, so the cylinder 13 contracts quickly and the material presser 9 also descends at a faster speed than during the above-mentioned cutting.

The cut material is then discharged from the material receiver 11.

Note that the material support 9 and the material receiver 11 are each made of a plurality of materials spaced apart in the width direction so as not to interfere with each other.

After this, the second solenoid ₁₄₂ is energized and switches the telescopic switching valve 14 to the extended position C, supplying air to the expanding chamber 1.
By supplying it to 3a and expanding it, the material support 9 is set at the material support position.

Effects of the invention When cutting the material, by setting the telescopic switching valve 14 to the retracted position B and the speed switching valve 20 to the first position,
Since the air from the expansion chamber 13a of the cylinder 13 is discharged through the first flow rate regulating valve 26, the contraction speed of the cylinder 13 is slowed down and the material support 9 can be lowered at the same speed as the cutting speed, resulting in poor cutting accuracy. Therefore, after cutting the material, the speed switching valve 20 is set to the second
Since the air in the extension chamber 13a of the cylinder 13 is discharged through the second flow rate regulating valve 27, the contraction speed of the cylinder 9 is increased, the material support 9 is rapidly lowered, and the material is rapidly discharged. Cutting time can be shortened and work efficiency can be improved.

In addition, since the descending speed of the material support 9 is controlled by adjusting the discharge flow rate of air from the expansion chamber 13a of the cylinder 13 using the first and second flow rate regulating valves 26 and 27, the descending speed is set to the material cutting speed. It can be adjusted according to the weight of the material, etc., and will not damage the material even when cutting soft materials such as aluminum or thin sheets.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is an air circuit diagram. 1 is the lower body, 2 is the lower blade, 4 is the upper blade, and 9 is the material support.

Claims (1)

[Scope of claim for utility model registration] A lower blade 2 provided on the lower body 1 and an upper blade 4 that moves up and down.
A shearing machine that cuts materials with a shearing machine, the lower body 1 is provided with a material support 9 that can move up and down between a material support position and a retracted position, and a cylinder 13 that moves the material support 9 up and down. Source air is transferred to the expansion chamber 13a of the cylinder 13.
a telescopic switching valve 14 that can be switched to an extension position C that supplies air from the air source to the compression chamber 13b and discharges air from the compression chamber 13b; and a contraction position B that supplies air from the air source to the compression chamber 13b of the cylinder 13 and discharges air from the expansion chamber 13a; Speed switching for switching between a first position in which the air discharge passage from the retracted position B of the telescopic switching valve 14 is communicated with the first flow rate regulating valve 26 and a second position in which the air discharge passage is communicated with the second flow rate regulating valve 27. A material support device for a shearing machine, characterized in that a valve 20 is provided, and the flow rate passing through the second flow rate regulating valve 27 is made larger than the flow rate passing through the first flow rate regulating valve 26.