DE2856063B2 - Gripper feeder - Google Patents

Description

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The invention relates to a gripper feed device for the step-by-step material supply of sheet metal strips or wire to a punch or press, which has a reciprocating transport element, whose feed length is adjustable by the variable eccentricity of a crank arm, the

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a shaft is coupled

Feed devices with pincer and roller feeds are known for presses and punching machines. which the strip or wire material to be processed gradually to the tool of the processing machine respectively. The phase of the feed movement generally extends over an angle of 180 °, measured at the crank angle of the feed device. For different use cases there is an angle of 180 ° too large for the phase of the feed movement,

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(see DE-OS 24 33 221). Such a design has the disadvantage that the increase in the drive speed the feed device causes high acceleration forces, which are inherently high-speed processing machines may exceed permissible values.

The invention is based on the object, one also as an addition to a feed device To create a suitable device in which a stepless adjustment of the feed phase in one wide angular range, e.g. B. between 80 ° and 280 °, without complex contouring work on the feed device is achieved.

This object is achieved in that the shaft is divided and the shaft parts are aligned with one another, wherein the one shaft part is mounted in a slidable link slide via a crank drive Turntable engages on one side and the turntable carries a support roller on its other side, which with according to the position of the sliding block variable lever length in a lever of the other part of the movement intervenes

Such a device can already be used during construction Connect the feed device firmly to its parts. Because of its simple structure, it is also suitable preferably as an additional device that can be retrofitted into existing feed devices can. With the same distance of the center axis of the crank pin and the support roller from the alignment line of the shaft parts, they rotate synchronously and continuously. If the link slide is adjusted, so the movement conditions change in the sense of a non-uniform output with an existing, uniformly

which the feed phase can be set in other angular ranges.

A discontinuous feed device is through the DE-OS 26 02 708 known It is on the Hubkurbei for the forward and return of the TransporteJementes an eccentric gear provided - which two eccentrically mounted, interlocking gears or contains elliptical gears. Depending on the set eccentricity, a faster Feed and slow return can be achieved. An expedient training can be structured in this way be that the crank drive of the drive part of the split shaft with a roller in a radial position Long hole recess of the turntable, which is displaceable perpendicular to the alignment line of the Weil parts, engages on one side, and that the one on the other side of the turntable on the diameter line of the slot recess lying support roller in a slot recess of the lever lying on the driven part of the shaft intervenes Such a training results in a constructive

tively simple overall structure and offers advantages in terms of manufacturing technology.

The turntable in the link slide can advantageously be in a circumferential ball or roller bearing run be stored.

In the drawing, an embodiment of the subject matter of the invention is shown schematically; it shows

F i g. 1 shows a detail view as a longitudinal section by a feed device in natural size,

2 shows a section along the line II-II at a Feed device according to FIG. 1.

According to FIG. 1 and 2 is in a split housing 1 a by means of an adjusting screw 2 on a threaded spindle 3 in the direction of the arrow transversely displaceable link slide 4 arranged in a unu? L »witigen Ball bearing 5 a turntable 6 aafniüiir *

The two shaft parts of the divided Vt Jar , ind with 7 (drive part) and 8 (output part) denote ^ ¹ · "-..

The drive unit 7 is available to me. main drive shaft

_the processing machine ^ .connection. From the-

'--- drive part · 8: is ~ with a ΐ-rbelschwmge 9 the

iT ^ Vprschubeinrichtang connected, _r the one by a

-Threaded rod iOrflfaer a sliding block 11 in his Eccentricity for changing the thrust quantity ν;

Bare crank pin 12 carries this crank pin 12, via a connecting rod 13, driving reciprocating tongs 14 ^: as a transport element for feeding in strip-shaped material 15. The control of the opening and closing process of the Bringer pliers

14 is omitted here for reasons of clarity; it takes place in a known structure.

On the drive part 7, a crank drive 16 is attached, which has a roller pin 17, the in a slot recess adapted in its width 18 of the turntable 6 is slidably mounted

On a diameter line which is the center line of the Determined elongated hole 18, the axis of symmetry of a support roller 19, which is in an adapted Slot recess 20 of one with the driven part 8

ίο connected lever 21 engages

An adjustment of the sliding block 4, in which the roller pin 17 is a smaller distance from the alignment line the shaft parts 7,8 received as the support roller 19 on the opposite side of the turntable 6, causes a discontinuous movement of the output part 8, in which the 180 ° feed phase required for transporting the tape material is already in place is covered while the drive part 7 has not yet covered a 180 ° range Be: one reverse displacement of the sliding block 4, in the case of 4 the distance between the support roller 19 and the alignment line is greater

: .— jst, as the distance of the roller journal 17: from this

f ^{7 T} Flüchtlinie are to perform the 1 «0 ° -Vorschubphäse on the rocker arm 9 over rö0 ° -Drehbewe-

25 ^: supply of the drive head 7 required

With the specified device, atrch for other drive purposes from-continuous drive discrete-rotary movements with given, Generate changeable phase ranges. This applies e.g. B.

for ejector or tool drives.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. Tong feed device for step-by-step Material feed of sheet metal strips or wire to a punch or press, soft one back and forth Has the forward transport element, the feed length of which due to the variable eccentricity a crank rocker is adjustable, wherein the feed device with the drive of the press Is coupled via a shaft, characterized in that the shaft of the feed device is divided, and the shaft parts (7, 8) are aligned with one another, with one shaft part (7) Via a crank drive (16) in a turntable mounted in a sliding link slide (4) (6) engages on one side, and the turntable (6) carries a support roller (19) on its other side, which according to the position of the link slide (4) variable lever length in a Hebei (21) of the other part of the contraction (8) intervenes. 2. Device according to claim 1, characterized in that that ter crank drive (16) of the drive part (7) of the split shaft with a roller pin (17) in a radially located elongated hole recess (18) of the rotating disk (6), which is displaceable perpendicular to the alignment line of the shaft parts (J, 8), engages on one side, and that the supporting roller (19) lying on the other side of the rotating disk (6) on the diameter line of the elongated hole recess (18) into an elongated hole recess (20) of the lever (21) located in the output part (8) of the shaft engages 3. Vorrich ^ ing according to claim 1 or 2, characterized in that the turntable (6) is mounted in the sliding block (4) in a peripheral ball or roller bearing (5) However, changing the phase of the feed movement requires the machine to be stopped because the eccentric stored gears must be exchanged or brought into a new meshing position. Through this costly conversion work is required. The adjustable feed phases are fixed values corresponding to 60 °, 90 °, 120 ° or 270 ° The state of the art includes feed devices in which cam drives control the feed phase determine; They also need gears or trolleys to change the pre-school phase be replaced. Another known possibility of changing the feed phase with an eccentric-controlled, backward and movable transport slide consists in the eccentric with Λ times the speed of the Drive shaft and the clamping device for the wire or tape material only during to actuate the feed phase of a stroke of the transport slide. This results in the feed phase of the individual strokes a rotation angle range of