FR2707273A1 - Device for stacking parts in thermoplastic plastic. - Google Patents

Abstract

a) Device for stacking components made from thermoplastic plastic. b) Device characterised by a control (16) which, in the unloading position, starting from a maximum travel position (A), covers, per cycle, a course which is reduced by the distance (H) existing between two stacked components (11) until the set number of components (11) per stack (19) has been achieved. A new cycle then commences.

Description

"Device for stacking pieces of material

thermoplastic plastic ".

  The invention relates to a stacking device.

  ge of thermoplastic parts ejected from a ribbing tool, consisting of a

  reception to seize the ejected parts and a dis-

  positive transfer from receiving device to po-

discharge.

  In a device of this type known from document DE-34 39 660, the ejected parts are sucked with a plate and optionally transferred after pivoting directly into stacking chutes located horizontally. The final position of the plate during the delivery of the coins is the same at each cycle, that is to say that a coin transferred into the chute pushes back the value of a coin the stacking of coins finding it before her. This is therefore a drawback, because the part must absorb all the effort to repel the stack. There is a risk of deformation of the parts which are still relatively hot. According to the slope of the walls

  side, there is a risk for pieces of the cup type that the pieces may get caught in one another, if stacking nipples are

  prayers were not planned. For flat parts,

  the preceding parts tend to shift or to cul-

  abut. As the part supplied in the case of parts of the cup type must fall exactly into the part previously it must be fixed in its delivery position and must not tilt, because otherwise the

  bottom of this piece meets the edge of the pre-

  cedent stacked. This must be obtained by pieces

  pressure springs or brushes, which maintain-

  fix the pile, after which the effort required

  to push the pile becomes more important.

  In the device known from document DE-

  OS 20 16 939, plastic parts are

  taken from a thin strip and placed one on the other

  be on a conveyor belt. As a result, the problems created by the next transport of the stack, related to the powered part, are in fact eliminated. There is nothing to take away from the named document anyway, regarding how the individual pieces are placed on top of each other and whether the transfer slide performs a swivel angle.

  different. This is to be excluded, because a pivot angle-

  different, viewed horizontally, would result in a different distance from the extractors

  with respect to the fixed center of rotation. The parts em-

  pounded would not be arranged clearly one on the other. There therefore remains for the known device only the possibility of carrying out a constant pivoting angle and of dropping the pieces on the conveyor belt or on the pieces already stacked. In a case with such a degree of freedom from trouble setting

pile are very common.

  The object of the invention is then to realize

  ser the device, so as to obtain a reliable removal, transport and stacking of parts, without

  create the danger of their deformation, their jamming

  or the spacing of the stack formed. The reci-

  pients must be set up exactly one

  in the other and be held until the fi-

  do not travel a free fall distance. For the conversion of a hot forming machine to another product, it is made possible, without great expense, to accommodate these new parts, from the point of view of their structure, their distance in a stacked state. compared to the others and the number of pieces per stack, until the next transfer of the stack. In total, the device is of simple construction and requires only

  simple shaped parts that can be changed quickly

is lying.

  This problem is solved according to the invention by a command, which in the discharge position, starting from a maximum stroke, achieves per cycle a

  reduced stroke of the distance between two parts

  these stacked, until the fixed number of pieces per stack is reached, the device starts again

then a new cycle.

  According to another characteristic of the invention

  tion, as a command, a servo motor is used.

  According to another characteristic of the invention

  tion, the pivoting of the receiving device is

  produced by a rod-crank system.

  Due to the fact that the receiving device is driven by an adequate control, the parts can be

  received and after transfer to the release position-

  lie in the room previously deli-

  vree, an adjustment of the stroke to the pre-

  fixed previously, between two pieces

  scalable; An exemplary embodiment of the invention is described in detail in the following from the schematic drawings. Thus: Figure 1 shows a cross section

  of a device shortly before receiving parts.

  Figure 2 shows the same cross-section

  shortly before the distribution of the coins.

  Figure 3 shows a top view of the device.

  positive in the direction of arrow X according to FIG. 1.

  Figure 4 shows an enlarged representation

  die of two containers in the stack.

  The device comprises a fixed frame 1, which is only roughed in position to obtain a

  better clarity. On it is mounted a support for 3

before pivoting around axis 2.

  The support 3 can be pivoted by a motor 4 by means of a crank 5 and a connecting bar 6 articulated on the support 3, between the receiving position shown in FIG. 1 and

  the dispensing position shown in Figure 2.

  In the support 3, two columns 7 are mounted, which are connected on one side by a cross member 8. On the

  crosspiece 8 is fixed the plate 9, which carries the hous-

  ments 10. The plate 9 and the housings 10 are

  shaped parts and therefore depend on the workpieces

  ler, which are shown in the drawings as containers 11. The shaped parts can also consist of a flat plate, which can be evacuated and which sucks the parts. Suction of the parts by vacuum, which can be achieved by sucking air through the holes 12, 13, is the simplest method

to grab the coins.

  On a longitudinal face the two columns 7 are provided with a toothing, in which a toothed wheel 14 meshes. The two toothed wheels 14 are mounted on the shaft 15, which is housed on the support 3 and is

  set in motion by a control 16, which preferably

  this is a servo motor, and which is also located on the support 3. The control 16 is produced so as to allow very exact positioning, its angle of rotation and therefore the position of the cross-member 8 being able to

  be easily changed through the re-

  reference from the device command.

  The device receives the containers 11 ex-

  pulses of the ribbing tool 17, in correspondence of which the cross member 8 with the plate 9 and the housings comes into place in front of its opening by pivoting and possibly by displacement by

  via control 16 (position of the

  gure 1) and the vacuum is applied. The containers 11 thus received are transferred to the vertical position

  shown in Figure 2. Next, the lowering takes place.

  ment of the cross-member 8, of a quantity "A" for a pre-

  mier container from a new stack, until the

  container 11 rests on the conveyor belt 18. In-

  then the vacuum is interrupted and the cross 8 returns-

  do up. After receipt of the following series

  of containers 11 and the pivoting of the support 3, the cross member 8 is lowered by a stroke of value "H"

  smaller than stroke "A" previously executed.

  "H" is then the measurement, which corresponds to the distance

  between two containers 11 stacked one inside the other.

  This distance can be fixed by empi

  corresponding lage in the case of go- type parts

  belet. In rooms without stacking nests, for example

  example of flat plates, measure "H" is deter-

  essentially undermined by the thickness of the leaves. AT

  each cycle is carried out respectively a di-

  minuted by the value "H", until a stack is formed with a fixed number of pieces. Then, the conveyor belt 18 is moved by a measure "B", so as to again leave room for the formation of a new stack. In this way, we

  performs a clean, accurate, problem-free transfer of

containers 11 of a stack 19.

  When converting the device, the measurement of

  start "A" of cross 8, the size of the distance

  this stacking "H" and the number of containers 11 for the constitution of a stack. The command can then

  calculate the required strokes. Nothing else was born

  stopped when changing equipment, other than

  changing the plate 9 with the housings 10.

Claims (3)

R E V E N D I C A T I 0 N S CLAIMS   1) Device for stacking parts ejected from a ribbing tool, made of thermoplastic material consisting of a receiving device for gripping the ejected parts and a device for transferring the   receiving device in discharge position, ca-   activated by a control (16), which in the position   discharge, starting from a maximum stroke (A),   alises by cycle a reduced stroke of the distance (H) existing between two stacked pieces (11), until the fixed number of pieces (11) is reached by   stack (19), and which then begins a new cycle.   2) Device according to claim 1, ca-   characterized in that as command (16), we use a servo motor.   3) Device according to one of claims 1   or 2, characterized in that the pivoting of the device   tif of reception (8, 9, 10) is produced by means of a   rod-crank system (4, 5, 6).