DE2015972A1 - - Google Patents

Description

• Patent attorney ., ■: c ..: ■; - ^ _{o Mar}

Dipi.phy _S .Dr.Waliher3unius ^

3 Hanover, Abbe.fr. α Dr

Heine Nude 1839

Smeralovy zi ^ ödy, 'narodni podnik, Brno - Czechoslovakia

Press drive with different Ai "speeds: escli speeds

The present invention relates to a simple press drive, which work at two different speeds enables.

Individual shaping technologies have their optimal deformation speed, which then adjusts the number of press strokes and also the actual deformation work are. . ■ ι. ■.

In the case of single-purpose machines, this requirement can be proportionate easily met. For example, punching presses have a large number of strokes and perform a relatively small shape

009847/1035

change work, while with drawing presses the opposite the case is"

However, it is difficult to meet these requirements in presses of universal use, such as eccentric presses, which are intended for cuts, bends, drawing work and the like. Eccentric are therefore usually produced in two versions, d _o h _s as high-speed and low-speed presses "However, these two alternative versions differ significantly by their structure from each other. In the case of high-speed eccentric presses, the drive is carried out directly by a flywheel, which is arranged with a coupling on an eccentric shaft, the energy of the flywheel being selected according to the cutting work to be carried out. In the case of a slow-running press, there is a gear on the eccentric shaft which is driven by a gear transmission on which a flywheel with a clutch is mounted, whereby the energy of the flywheel corresponds to the deformation operations to be carried out by pulling »

The number of strokes to a larger extent only by changing the speed of the flywheel, z »Bo with the help of a variator or high speed. Electric motor, change, is on these presses not possible because the energy of the flywheel after the speed change has been completed is in the opposite ratio as would be desirable »If the number of strokes decreases, the energy of the flywheel would be equal to the square of the angular velocity decrease"

03847/1035 bad original

\ ■■: - C

The need for _t two or three different in the draft versions of eccentric presses to manufacture, then have a substantial influence on their production costs.

jiJs ^ are also known eccentric presses, in which there it is possible to change the speed of a ram iir. essentially to be carried out according to two procedures ο

The first method is the variable angular velocity of the shaft during one revolution and when

In the second method, the angular speed is constant for the duration of a stroke, with starting, braking, etc. not can be viewed as a change in speed.

The first method is suitable for low-speed drawing presses with a large stroke. With them z _e as the speed change is achieved in such a way that the drive of the press by two Elektroinotore, - two clutches, brake and two transmission case "occurs when the non-working portion of the ram height

stroke, during which the movement of the ram slows down

runs, the drive takes place via a smaller translation, while the working part of the ram stroke, where it is required is to make the movement of the ram slower, the clutch engages a larger translation. It's understandable, that two electric motors, clutches and translations make the machine much more expensive.

An eccentric press is based on a similar principle,

009847/103 $ β _Α0 ,

which is equipped with a planetary gear, a clutch and a brake built into the flywheel.

In the second method, in which during the lifting period the angular velocity is constant, the stroke becomes ^ ahl ZeB. set in advance with the help of a variator » However, this has the major disadvantage that with a lower tappet speed, the speeds of the flywheel are also lower and thus also its energy, which is exactly the opposite of what is desirable «This procedure can therefore be used for a larger Control range cannot be used <>

Another possibility is to change the speed of the To leave the flywheel unchanged and the translation to the eccentric shaft, for example with the help of interchangeable gears to change, which is very tediousj or with the help of a 7 / Echsel gear, which is again expensive «.

The invention avoids these disadvantages o

The main feature of the invention consists in the arrangement of a loosely rotatable in the machine frame on a shaft mounted auxiliary flywheel, which with a driving Main flywheel can be set in motion connection, for example by an axially displaceable pinion, which can be brought into or out of engagement with a toothing of the driving main flywheel.

The essence of the invention, further details, further advantages

009847/1035 bad original

parts and features of the invention are based on a nachs'teh'erid in the drawing ¹ schemätisch ¹ in partial longitudinal section of an embodiment shown An'triebsorgarie'S an eccentric explained in more detail '

In the upper part of a box-shaped: machine frame 1 If an eccentric shaft 2 is mounted either directly or on a Ürä tube jj> As shown, a main flywheel 4 is rotatably mounted «The connection of the Main flywheel 4 center eccentric shaft 2 secures a, Friction clutch 5 »which can be combined with a brake kahru The drive of the main flywheel 4 by fine not shown known drive motor with changeable number of poles can iait the help of a drive belt, not shown

In comparison to the usual arrangement, a toothing 6 is provided on the outer circumference of the main flywheel 4, which can come into singular engagement with a pinion 8. This pinion 8 is arranged axially displaceably at the flying end of a stepped shaft 9, which is fixed in a rib 10 of the machine frame 1. The axial advance movement of the aforementioned pinion 8 on the right end of the shaft 9 can be effected by any displacement device, not shown, which is operated in a known manner by the operator with the aid of a hand or foot lever, not shown. In the end positions of the axial feed motion of the pinion 8, for example by means of a 3icherungsstiftes / retained on a sleeve 11 of the shaft 9 _1,2,: which can be either inserted into a hole 11 or similar 13 or I4 of the liner. . ,. ■■ '.

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201597

An auxiliary flywheel 7 is also loose on the shaft 9 rotatably mounted, which is firmly connected to the sleeve 11 arranged on the shaft 9.

The device works as follows:

Should the press with a higher number of strokes (high-speed alternative) work, the known drive motor, not shown, is switched to a low number of poles, so that it has a higher speed and also drives the main flywheel 4 at this higher speed. With this fast-moving The way in which the toothed pinion 8 works is fixed in its right end position on the sleeve 11 of the V / elle 9, see above that the pinion 8 does not engage in the toothing 6 of the main flywheel.

If the press is to work slowly, the aforementioned drive motor is switched to a larger number of poles, so that it turns more slowly <> At the same time it shifts Pinion 8 from its right end position towards the left, i.e. in the left end position shown in the drawing, in which the pinion 8 by pushing the locking pin 12 into the hole 14 of the sleeve 11 of the shaft is held and the pinion 8 engages in the toothing 6 of the main flywheel 4 directly.

If the mentioned drive motor, not shown, is now switched on, which also drives the main flywheel 4 at a reduced working speed, which via the

0098A7 / 103 5

zahnun ^ 6 and ¹ the pinion'8 also drives the auxiliary flywheel 7 of a gear ratio at high speed, energy is drawn from both flywheels 4 and 7 during machine work, which is why the gear drive between the two flywheels 4 and 7 no longer uses the full torque of the eccentric shaft 2 needs to be dimensioned "

In comparison to the known devices mentioned ahn-- ^

Iieher kind is therefore with reduced speed of the flywheel achieved the required increase in its energy.

According to the invention, both the fast and slow running The press has a uniform design, the production of which is cheaper. The press is also the desired one Alternatively, the number of strokes is easily adjustable and therefore more universally applicable. . "

00 9847/1031

Claims (1)

Claims «J drive of a press, in particular an eccentric press with different working speeds, in which a main flywheel, which is optionally provided with a built-in combined clutch and brake, is mounted on an eccentric shaft,
marked by arranging a in the machine frame (i) a shaft (9) loosely rotatably mounted auxiliary flywheel (7), which is in motion with the main driving flywheel (4) s connection can be set «. 2 «drive of a press according to claim 1, characterized in that that the auxiliary flywheel (7) loosely rotatably mounted on the y / elle (9) is provided with a bushing (11) on which a heat exchanger (8) is axially displaceable and with a toothing (6) of the driving main flywheel (4) can either be brought into or out of engagement " 3 »drive of a press according to claims 1 and 2, characterized, d; eat the hit (8) in its right end position for Example is held with the help of a locking pin (12). Ό Q 9 847/1035 BAD ORIGINAL