DE3112382C2 - Stroke adjustment device for eccentric presses or punches - Google Patents

Abstract

The invention relates to a stroke adjustment device in eccentric presses or punches with two connecting rods on the eccentric shaft and eccentric bushings individually assigned to these, which are connected to the eccentric shaft in a rotationally fixed manner via a releasable tooth lock. Here, a perfect and automatically working synchronization in the stroke adjustment of both connecting rods with independently adjustable eccentric bushes should be guaranteed. This is achieved in that each ratchet consists of a non-rotatable driver ring and this and the eccentric bushing on the ring gear overlapping, displaceable driver ring, which latter can be disengaged from the toothing on the non-rotatable driver ring by means of attacking adjusting pistons, such that when this driver ring is adjusted by turning the eccentric shaft whose position is adjustable with respect to the eccentric bushing to be retained.

Description

55

According to DE-PS 24 50 973, a stroke adjustment device is according to eccentric presses or punches The preamble of claim 1 is known. bo

This design requires the eccentric bushes to be held in place when the eccentric shafts are turned a special urge to move.

In contrast, it is the object of the invention to maintain secure synchronization in eccentric presses or punches with two connecting rods, so-called two-point presses, when adjusting the stroke of both connecting rods with independently adjustable eccentric bushes , without the need for an additional movement drive to hold the eccentric bushes

The embodiment is shown for a press with only one eccentric shaft. This task is carried out with the Stroke adjustment device on eccentric presses or punches with two connecting rods according to the generic term des Claim 1 solved according to the invention with the features indicated in the characterizing part of which the Subclaims specify further more specific configurations.

The invention thus partially makes use of features of a stroke adjustment again Eccentric presses or punching according to DE-PS 22 25 929. On the one hand, this requires a manual Actuation and, on the other hand, can only be used with eccentric presses or punches without a central bearing.

Further details emerge from the description from the drawing, which shows a preferred embodiment of a stroke adjustment device according to the invention in eccentric presses or punches represents and shows

F i g. 1 the longitudinal section through an eccentric press or punch with stroke adjustment device,

F i g. 2 the cross-section for this at the level of the eccentric shaft,

Fi g. 3 and 4 the partial sections of the stroke adjustment device extended and retracted,

F i 3. 5 the top view of this and

F i g. 6 shows the schematic view of the overall circuit of the stroke adjustment device.

In the drawing, the press frame 1 can be seen in FIG. 1 with table top 2 and eccentric shaft 3 with two eccentric bushings 4, which sit on eccentric pins 3a of shaft 3, and connecting rods 5, which act on press ram 6. At one end of the eccentric shaft 3, the flywheel drive 7 with drive motor 8 and the clutch-brake unit 9 is arranged in a known manner on the press frame 1 according to the schematic drawing FIG.

The eccentric bushes 4 are for stroke adjustment via a releasable ratchet of the parts 11, 12 according to Fi g. 3 and 4 normally non-rotatably connected to the eccentric shaft 3 or the eccentric pin 3a, each toothed lock consisting of a non-rotatable drive plate 11 and the sliding sleeve 12 overlapping this and the eccentric bushing 4 on its toothed ring. The sliding sleeves 12 can be disengaged from the toothing of the non-rotating drive plate 11 by means of engaging adjusting bolts 13 of hydraulic or pneumatic cylinders, for which purpose the bolts engage on both sides by means of rotatably mounted discs 14 in an annular groove 12a of the sliding sleeve 12 to move it.

In detail, a sliding sleeve 12 for each eccentric bushing 4 is provided with two internal toothing sections \ 2b, YIc and an intervening toothing-free section 12c /, of which one toothing section 126 is permanently in a correspondingly long external toothing 4a of the eccentric bushing 4 even when the sleeve 12 is shifted remains in engagement, while the other toothed section 12c of the sliding sleeve 12 is only in its one axial position in engagement with the external toothing Ha of a rotationally fixed drive plate 11 and when shifted into the other axial position the teeth 11a of the drive plate 11 with the tooth-free section 12 </ the sleeve 12 meets, after which the sliding sleeve 12 after release

the drive plate 11 with a continuation of the same displacement movement at the end face in a form-fitting engagement occurs with a stationary locking part 18

As shown in FIG. 1 and 6 is further evident, is with an eccentric bushing 4 with a zero setting plate 15 Zero-setting initiator 16 coupled via a sliding block 17 with driving pins what the zero position before Each stroke adjustment is used. For the zero position, the disc 15 is turned into a Bringing a defined starting position Then each of the sliding sleeves 12 runs out when it is extended the toothing of the non-rotatable driver plate 11 with the eccentric bushing 4 remaining toothed, the sliding sleeve a locking bolt 18 for fixing the position when adjusting the eccentric shaft 3 accordingly F i g. 3 and 4 on. In addition to the zero setting disk 15, there is also a stroke adjusting disk on the eccentric shaft 3 19 arranged with corresponding perforations for a stroke position transmitter 20 as is also shown in FIG F i g. 1 and 6 can be seen, so that with zero current the Disc 15 via the disc 19 with encoder 20, a new stroke position can be set

Finally, FIG. 1 in conjunction with the schematic drawing F i g. 6 can also be seen that each one of the adjusting bolts 13 for the exit of the sliding sleeve 12 from the non-rotatable drive plate 11 limit switches 21, 22 are assigned for the release the stroke adjustment or the continued running of the machine. In Fig. 6 is also on the one hand an unlocking valve 23 for initiating the stroke adjustment can be seen, and on the other hand the stroke adjustment motor 24 with clutch 25 and associated switch 26, which Stroke adjustment motor 24 via the flywheel drive 7, 8 and eccentric shaft 3 opposite the stroke adjustment disk 19 the position transmitter 20 and thus, relative thereto, the eccentric bushings 4, as described above, adjusted The two eccentric bushings 4, which are arranged independently of one another, can thus be used here for stroke adjustment Adjust synchronously, which is especially true for machines with a central bearing located between the two connecting rods 5 27 is to be demanded for external camps 28.

For this purpose 4 sheets of drawings

Claims (4)

Patent claims: 1. Stroke adjustment device on eccentric presses or punches with two connecting rods that are mounted on eccentric bushings, which sit on eccentric pins, with an eccentric shaft bearing in front of and behind each eccentric, with a toothing on each eccentric bush, with which they are connected to a part that is fixed against the shaft, which is a has corresponding counter-toothing, is in releasable tooth engagement, which is releasable by an axial displacement movement, whereby the eccentric bushing always remains in a rotationally fixed connection with a component which can be fixed in a rotationally hindered manner by form-fitting with the housing of the press, characterized by a sliding sleeve (12) each. for each eccentric bushing with two internal toothing sections (126, XIc) and an intermediate tooth-free section (VId), of which one toothed section (12b ) is permanently in a correspondingly long external toothing (Aa) of the eccentric bushing (4) even when the sleeve (12) is moved remains engaged while the other Ve rzah tion section (12c) of the sliding sleeve (12) is only in its one axial position in engagement with the external toothing (Wa) of a non-rotating shaft drive plate (11), while when shifted to the other axial position, the toothing (Haider drive plate (11) with the gear-free section. (\ 2d) of the sleeve (12) coincides, and that the sliding sleeve (12) comes into positive engagement with a stationary locking part (18) on the face side after the drive plate (11) is released and the same sliding movement is continued. 2. Stroke adjustment device according to claim 1, characterized by an annular groove (12a ^ on the circumference of the sliding sleeve (12), in which two disks (14) engage at two opposite points, each of which is movable by an adjusting bolt (13) in the direction of its axis. 3. Stroke adjustment device according to claim I, characterized in that the sliding sleeve (12) has on one end face a radial groove (\ 2e) with which it can be brought into engagement with a stationary locking bolt (18). 4. Hubverstelleinrichtung according to claim 2, characterized in that in each case one of the Adjusting bolt (13) for moving the sliding sleeve (12) out of engagement with the drive plate be (H) or back limit switches (22, 21) are assigned for releasing the stroke adjustment or the The press or punch continues to run.