DE2342098A1 - OIL PRESS - Google Patents

Description

DIPL-ING. HORST ROSE DIPL-ING. PETER KOSEL PATENT LAWYERS 9 Q / O Π Q Q

3353 Bad Gandersheim, 20 AUQ 1070 P.O. Box 129 ' ³ ' ^J

Hohenhöfen 5 Telephone: (05382) 2842 Telegram address; Badgandersheim patent

Our file no. 2505/9

Aida Engineering, Ltd.
Patent geaueh dated Aug 20, 1973

Aida Engineering, Ltd.

No. 2-10 0hyama-cho, Sagamihara-shi, Kanagawa-ken, Japan

oil press

The invention relates to an oil pressure press with two band switches which can be actuated at the upper or lower end of the stroke of a ram of the press in order to control a solenoid valve used to control the pressure in the cylinder of the press that actuates the ram, the working position of at least one & ex Limit switch for adjusting the press stroke is adjustable.

With such presses one is often faced with the task of operating an additional device of the press depending on the stroke, E.g. a conveying device for material or products, a scrap shear, a mechanical or a compressed air operated one Ejector, etc., in such a way that this additional device is actuated at a certain phase of the ram stroke even if the stroke is changed.

If the ram stroke is changed in the known presses and / or if molds or dies are replaced by those with different heights, one is forced to use the Position of the limit switch (s), which or which signals

A09812 / 039S Ha / Hn.

to operate such an additional device should or should be set again.

Such a hay setting of the position of the limit switch or the limit switch makes it difficult to operate the press. Take the Pig curves a and b as an example. 1, one of which corresponds to a large stroke A and the other to a small stroke B, and it is also assumed that a specific limit switch used to control such an additional device is set at the points aj and a on curve a in the middle of the stroke _{2 is} actuated, it can be seen that one has to move the limit switch by the amount alpha in curve b for actuation of the middle of the stroke of this curve, i.e. at points bu and bp. Moving the limit switch (s) in this way is labor-intensive, takes a relatively long time and therefore reduces the output of such a press.

It is therefore an object of the invention to avoid disadvantages of the known oil pressure presses and, in particular, to make the operation of an additional device of such a press regardless of the press stroke currently used easy.

According to the invention this is achieved in an oil pressure press mentioned at the outset in that for controlling the actuation an additional device of the press a variable resistor that can be connected to a terminal of a voltage source it is provided that with the other clamp of the voltage source a first displaceable relative to the resistor Contact is connected, the position of which depends on a change in the response position of the adjustable limit switch is changeable and thus causes a change in the resistance section β to which the voltage is applied, that a displaceable second contact is also assigned to the variable resistor, the position of which has a function the position of the ram of the press, and that at least one Schmidt trigger is connected to the movable contact whose output signal is used to operate the additional device. That way you achieve a very

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OBtGINAt INSPECTED

simple control of the Additional device, i.e. you no longer need a limit switch assigned to this additional device when changing the ram stroke adjust each time. The same also applies when dies or molds with different heights be used.

A particularly simple embodiment is obtained according to the invention in that at least one cam and the first contact are arranged on support members carried by the oil cylinder are, and that these support members are adjustable to the actuating position of this cam relative to the associated To make limit switches and thus the press stroke adjustable.

Further details and advantageous developments of the invention emerge from the following description and the embodiment shown in the drawing, as well as from the subclaims. Show it

! ig. 1 is a diagram showing various courses of the stroke of the press ram in a hydraulic press represents

FIG. 2 shows a schematic representation, partially shown in section, of a preferred embodiment of a Device according to the invention for controlling the actuation of an auxiliary device of a hydraulic press, and

Pig. 3 shows an illustration to explain the mode of operation and the interrelationship between the effects of the parts according to FIG. 2 _e

Fig. 2 shows the frame-like frame 1 of an oil pressure operated hydraulic press, which has a frog plate 2 attached to this frame and a press ram 3 having. In the usual way will be on the frog plate

2 and the plunger 3 matching dies or molds, not shown here, attached to each other cooperate during the operation of the press in order to process a workpiece (not shown) accordingly. The plunger

3 is attached to the upper end of a support member 6, the

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The lower end is made in one piece with a piston 5, which in turn has a thread on its outside 8 provided hydraulic working cylinder 4 is performed. On the thread 8 is a on its outside with a Screw thread provided member 7, which as shown in the frame 1 can be rotated axially immovable is mounted and meshes with a worm shaft 9, which can be driven by a motor 10 arranged on the frame 1 « If the worm shaft 9 is driven by the motor 10, the link 7 rotates in the direction of rotation of the motor 10 one or the other direction, and this in turn moves the cylinder 4 upwards or downwards. Corresponding is also the arranged on the support member 6 press ram 3 moved up or down, so that the height of the press ram 3 is adjustable according to the height of the dies or molds used.

In the cylinder 5 is an upper cylinder chamber 11 and a Lower cylinder chamber 12 is provided, which are separated from one another by the piston 5. Furthermore, an to a (not illustrated) pressure oil source connected solenoid valve 15 is provided, which via a line 13 with the chamber 11 and via a line 14 to the chamber. 12 of the cylinder 4 is connected.

On the left side (based on FIG. 2) of the plunger 3, a horizontal support rod 16 is attached to which the free or outer end of a binding switch 17 is attached, which serves that the upper end of the stroke of the plunger 3 to capture »+ Likewise, an approximately L-shaped support member 18 is attached to the left side (based on Figo 2) of the cylinder 4, which extends from there first horizontally and then vertically upwards, with the upper end of the vertical Section a cam plate 19 is attached, which interacts with the limit switch 17: When the plunger 3 the When the upper end of the stroke is reached, the limit switch 17 comes to rest against the cam plate 19 and is thereby actuated.

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On the right side (with reference to FIG. 2) of the plunger 3 Another horizontal support rod 20 is attached, at the free end of which a limit switch 21 is attached «, This Support rod 20 has an upwardly projecting, L-shaped port set 20 *, the purpose of which will be explained in the following. Of the Limit switch 21 cooperates with a cam plate 22 which is attached to the upper end of a vertical support rod 23 (or more precisely said, on one of the top two sets of ports on the pole 23) is arranged, namely for detecting the lower end of the stroke of the press ram 3 · The support rod 23 has on its lower end an external thread which is in engagement with an internal thread of a cylindrical part 26, the latter is rotatably arranged in a ring 25, which in turn on a horizontal arm of an approximately I-shaped support member 24 is arranged. The support member 24 extends from the right side of the cylinder 4 in the horizontal direction and has a vertical, upwardly extending port set 24 '. To rotate the cylindrical part 26, a motor 27 is provided, With its help, the position of the sock plate 22 and consequently also the lower end of the stroke of the plunger 3 can be adjusted are. This means that the press stroke can be changed. The limit switches 17 and 21 are via lines 28 and

29 connected to the solenoid valve 15, and control on this Make the transition from the upstroke to the downstroke of the plunger 3 (or vice versa) by turning the solenoid valve on the top Change direction at the end of the stroke or at the lower end of the stroke of the plunger 3.

The top of the port set 24 * is connected to a Frame 1 provided towards extending horizontal Portaatz, from which a variable electrical resistance VR extends downward. A first displaceable contact lies against this resistance VR on one side

30, which is arranged isolated on the other Porteatz of the support rod 23. A second sliding contact

31 lies against the other side of the resistance as shown VR on; the contact 31 is insulated and attached to the free end of the port set 20 *.

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As FIG. 3 shows, the resistor VH is assigned a DC voltage source E in such a way that one terminal of VR is connected to one pole and the first contact 30 is connected to the other pole of this voltage source, while the second contact 31 is connected to the inputs of several Schmidt triggers Sj, Sg »S ,, Si ... S, the outputs of which are connected to the actuating device of an additional device (not shown) of the press} Be very scissors. The response voltages of the various Schmidt triggers S ^ to S are expediently selected to be different, for example 2 volts, 2.5 volts, 5 volts, 6.5 volts or η VoIt ₀

As a first example it is assumed that the stroke of the tappet 3 is set to 200 mm by means of the upper and lower cam plates 19 and 22, respectively. The lifting movement then follows curve a of the pig. 1 and the voltage across the resistor VR is, for example, in the range 2 ... 8 volts when the second contact 31 moves along the resistor VR Y. The signals for actuating the additional device are then _{generated, for example 0} , in the middle (points a .. and a ″ of curve a) of the ram stroke, with the voltage at tap 31 being Jewell · 5 volts, ie at this voltage the speaks assigned Schmidt trigger S, to. So when the plunger 3 reaches the points a ^ and & 2 lying in the middle of its stroke, and when the tap 31 thus reaches the middle of its displacement range, the Schmidt trigger Sz, which is set to a response voltage of 5 volts, generates signals to the Actuation of the mentioned accessories.

As a second example, consider the case where the slide stroke is reduced to 100 mm. To do this, first the cylindrical part 26 rotated by means of the motor 27 so that the squat plate 22 for the lower end of the stroke by 100 mm is raised. This raising also raises the contact 30 and the effective portion of the resistor VR is reduced accordingly, i.e. the voltage E is now on a smaller section of the resistor VR,

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and at the Burch.fah.ren. of this smaller section, i.e. at a »stroke of only 100 mm, just passes through the voltage range. Tone 2. «ο 8 volts.

So you can see that even if the ram stroke tob. 200 is changed to 100 mm and the plunger 3 the crank b 1 passes through the voltage at the tap 31 in the Middle of the ram stroke, i.e. at points b * and bg PIg. 1, again 5 volts and also the Sehmidt trigger S, which is set to 5 volts, so that again in the middle of the hub the (not shown) Additional device is operated. (The voltages mentioned at tap 31 are of course in each case potentials that related to one of the terminals of the oil DC voltage source Ξ are.)

As can be seen from the above description, can with a device according to the invention, the actuation of a Pressea accessory simply and effectively also, then controlled when the ram stroke is changed. All that is needed is the working position of the lower limit switch accordingly to be re-hired.

All further desired is the press attachment to be actuated at a certain point in the area of the ram stroke. With the appropriate setting, the Schmidt trigger the actuation of this accessory device easily being controlled.

Naturally, modifications are within the scope of the invention possible, e.g. through a different transmission of the slide movement to the various electrical devices, in particular Reduction or reduction of these movements, kinematic Reversals, conversion of the linear movement of the plunger into a rotary movement of a rotary potentiometer, etc. Solehe and other modifications are within the scope of the present invention

Patent attorneys Dipl.-Ing. Horst Rose Dipl.-Ing. Peter Kosel

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Claims (3)

DIPL-ING. HORST ROSE DIPL-ING. PETER KOSEL "O O A 3353 Bad Gandenshelm, ^ U. Aug 1973 P.O. Box 129 Hohenhöfen 5 Telephone: (05382) 2842 Telegram address: Siedpatent Badgandersheim Our file no. 2505/9 Aida Engineering, Ltd.
Patent application dated Aug. 20, 1973 Claims Oil pressure press with two limit switches, which can be actuated at the upper or lower end of the stroke of a ram of the press to control a solenoid valve used to control the pressure in the cylinder of the press that actuates the ram, the working position of at least one of the limit switches for adjusting the The press stroke is adjustable, characterized in that a variable resistor (TR) which can be connected to one terminal of a voltage source (E) is provided to »control the actuation of an additional device of the press. VR) movable first contact (30) is connected, the position of which can be changed depending on a change in the response position of the variable limit switch (21) and thus causes a change in the resistance section to which the voltage (E) is applied, and also the variable resistance (VR) is assigned a displaceable second contact (31), the position of which e There is a puncture of the position of the ram (3) of the press, and that at least one Schmidt trigger (S ₁ , ... S _n ) is connected to the movable contact (31), the output signal of which is used to activate the additional device * Ra / Hn. 409812/0395 2. Oil pressure press according to claim 1, characterized in that that both limit switches (17 »21) are connected to the plunger (3) and designed to each have one of these limit switches containing circuit (28), (29)! when squats (19 »22) connected to the oil cylinder (4) come to rest against the limit switches, 3. öldruok press according to claim 1 or 2, characterized in that that at least one cam (22) and the first contact (30) on support members carried by the oil cylinder (4) (23) are arranged and that these support members (23) are adjustable (26, 27) to the actuating position of this To make the cam (22) relative to the associated limit switch (21) and thus the press stroke adjustable. 4 · oil pressure presse one of claims to 3 * characterized in that a height adjustment device (1O, 9 »7) is provided for the oil cylinders (4) _f in order to enable an adaptation to different Höhenmafle dies used according to at least" 5β oil pressure press according to claim 4 »characterized in that that the height adjustment device is rotatable by a drivable son corner wheel (9) in the frame (1) the press has rotatably mounted part (7) which engages with a thread (8) on the oil cylinder (4) stands, β® that an actuation of the worm wheel (9) causes a height adjustment of the oil cylinder (4). Patent attorneys Dipl.-tng. Horst Röse Dipl.-Ing. Peter Kos el 409812/0395