JPH0318018Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to a knock-out device for a press.
In detail, it relates to a knock-out device for taking out products stuck to the upper mold.

(Prior Art) In the prior art, a knockout device for taking out a product from an upper mold has a knockout bar provided on a rod protruding from an air cylinder provided on a slide. When press working is performed at the bottom dead center of the slide, the rod with the knockout bar is pressed through the knockout pin and the knockout bar and is configured to enter the cylinder. Also, when the slide passes the bottom dead center and rises, the piston inside the cylinder tries to return to its original position, so the rod protrudes from the cylinder and the knockout bar pushes the knockout pin as described above. The product is removed from the upper mold by pressing in the opposite direction.

Although the above-mentioned prior art is a knock-out device having a general structure, a knock-out device in which the position of the knock-out can be adjusted is known as devised in Japanese Utility Model Application Publication No. 106538/1983.

The device described in the above publication is equipped with a stopper that determines the lower limit of the knockout bar. The stoppers 9, 9' are housed in cylinders provided on the lower surface of both ends of the knockout bar 5, and the stoppers 9, 9 have hole-shaped portions 20, 20 formed in the portions of the knockout bar corresponding to the cylinders. It is connected to the adjusting rods 3 and 3' that penetrate through the
The output shafts of screw jacks 1, 1' are connected to the upper ends of the adjuster rods 3, 3'.
Further, a bevel gear 14 or a drive shaft 15 is connected to the input side of the screw jacks 1, 1'.
On the other hand, an air motor 10, a drive shaft 13, etc. for driving the bevel gear 14 are connected to the body side.

Therefore, the air motor 10 is rotationally driven to
One screw jack 1 is driven via the bevel gear mechanism 12, the drive shaft 13, and the second bevel gear mechanism 14, and the other screw jack 1' is driven via the drive shaft 15, so that the left and right adjusting rods 3, The height of the stoppers 9, 9' can only be adjusted after going through a complicated procedure of raising and lowering the stopper 3' and adjusting the height of the stoppers 9, 9'. A number of problems arose.

In addition, in the prior art described in the above-mentioned publication and prior art, the knockout bar and the knockout pin are always in contact with each other, so that the knockout pin adjusts the amount by which the product enters the upper mold during press processing. This will push up the knockout bar. This means that a force for knocking out the product is applied to the knockout pin during the press process, and the knockout operation has already started during the press process. However, starting a knock-out operation during processing is not at all desirable depending on the shape of the product, but this cannot be avoided in the prior art.

(Problems to be Solved by the Invention) The present invention enables the knock-out position to be performed at any position in the upward stroke of the slide, and also makes it easy to set and adjust the position at the start of the knock-out. An object of the present invention is to provide a knockout device.

(Means for Solving the Problems) The present invention includes a knockout bar connected to each piston rod projecting downward from knockout cylinders provided on the left and right sides of the slide, and a knockout bar connected to each piston rod provided on the slide and below the knockout bar. a replaceable spacer that determines the lowering limit of the knockout bar at a position; a knockout pin provided on the slide and abutting the knockout bar at a position corresponding to the upper die; and a signal from a press rotary cam. The present invention is characterized in that it includes an air pressure supply means piped to supply air pressure to the knockout cylinder at any position of the slide upward stroke.

(Function) The timing of the rotary cam is set so that the knockout starts at an arbitrary position during the upward stroke of the slide 1, and the solenoid valve 14 is operated by the signal from the rotary cam to supply air pressure to the knockout cylinder 2. do. When the piston 3 is lowered by air pressure, the knockout bar 5 is lowered together with the rod 4, and the knockout pin 9 is pushed down to knock out the upper mold product.

The knockout stroke length is determined by the distance between the knockout bar 5 and the spacer 7. To change the knockout stroke length depending on the size and shape of the product, use spacers 7 with different heights.
and change the distance between the knockout bar 5 and the knockout bar 5.

(Example) FIG. 1 is a front view of the knockout device, and FIG. 2 is a side view of the same, and FIG. 1 shows a part of the left side of the slide.

1 is a press slide; 2 is a knockout cylinder provided on the side wall of the slide 1; a rod 4 provided on a piston 3 projects downward; and a knockout bar 5 is provided at the lower end. Figure 1 shows the left side of the slide, and since the knockout cylinder 2 is also provided on the opposite side of the slide, both ends of the knockout bar 5 are connected to the piston rods of the knockout cylinders provided on the left and right sides of the slide. connected. The knockout bar 5 moves up and down as each rod 4 moves up and down. A compression spring 6 is installed between the bottom wall of the knockout cylinder 2 and the piston 3, and the piston 3 is biased upward when no fluid pressure is supplied to the cylinder.

A spacer 7 for adjusting the stroke length of the knockout is detachably provided at a position facing the lower surface of the knockout bar 5 at the side end of the slide 1, and the spacer 7 has different heights. The knock-out stroke length can be adjusted by attaching them interchangeably.

Reference numeral 8 denotes an insert plate provided on the slide 1, on which a knockout pin 9 is slidably provided, and an upper mold (not shown) is provided. The knockout pin 9 is biased upward by a spring 10 mounted between the knockout pin 9 and the insert plate 8, and its upper end is brought into contact with the lower surface of the knockout bar 5.

FIG. 3 is a piping diagram for supplying air pressure to the knockout cylinder 2, in which air from the airline 11 passes through a pressure adjustment mechanism 12 to the air tank 1.
3 and further supplied to the upper chamber of the knockout cylinder 2 via a solenoid valve 14 that operates in conjunction with the press rotary cam.

The embodiment has the above-mentioned configuration, and since the slide 1 descends to perform press working and then ascends, the timing of the rotary cam is set so that knockout is started at an arbitrary position during the ascending process of the slide 1. The solenoid valve 14 is actuated by a signal from the rotary cam to supply air pressure to the knockout cylinder 2. When the piston 3 is lowered by air pressure, the knockout bar 5 is lowered together with the rod 4, and the knockout pin 9 is pushed down to knock out the upper mold product.

The knockout bar 5 descends together with the slide 1, but is separated from the knockout pin 9. In addition, the knockout pin that rises due to press processing,
It comes into contact with the knockout bar 5 for the first time at the end of machining. Therefore, during processing, the knock-out pin 9 is not subjected to any downward force by the knock-out bar 5, that is, the knock-out operation, and therefore no unreasonable force is applied to the product.

Furthermore, since the knockout stroke length is determined by the distance between the knockout bar 5 and the spacer 7, in order to change the knockout stroke length depending on the size and shape of the product, the spacer 7 of the desired height can be adjusted. is installed, the distance between the knockout bar 5 and the spacer 7 is changed, and the length of the knockout stroke is adjusted.

(Effects of the Invention) The present invention has the effect that the length of the knock-out stroke can be easily changed because the removable adjustment spacer provided on the slide can be replaced.

In addition, in the present invention, the knockout pin that rises during the press work comes into contact with the knockout bar for the first time at the end of the press work, so the knockout operation is not performed during the process, and therefore, it is possible to avoid applying excessive force to the product. This has the effect of not causing any damage to the product.

Furthermore, since the present invention synchronizes the knockout timing with the press rotary cam, there is an advantage that the knockout can be performed at any position in the slide upward stroke.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the knockout device of the present invention, and is a longitudinal sectional front view showing a part of the slide, FIG. 2 is a side view, and FIG. 3 is a piping diagram. 1... Slide, 2... Knock out cylinder, 3... Piston, 4... Rod, 5... Knock out bar, 6... Spring, 7... Spacer, 8
...Insert plate, 9...Knockout pin, 10...Spring, 11...Airline, 12...
...Pressure adjustment mechanism, 13...Air tank, 14...
solenoid valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A knock-out bar connected to each piston rod projecting downward from knock-out cylinders provided on the left and right sides of the slide; a knock-out bar provided on the slide and located at a position below the knock-out bar; a replaceable spacer that determines the lowering limit of the press; a knockout pin that is provided on the slide and comes into contact with the knockout bar at a position corresponding to the upper mold; A knock-out device for a press, comprising: an air pressure supply means piped to supply air pressure to the knock-out cylinder at a position.