DE258047C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 258047 CLASS 80 «. GROUP

LADISLAS PENKALA in COURBEVOIE, Seine.

Patented in the German Empire on April 26, 1911.

The invention relates to a drum press intended for shaping plastic masses. The pressing device itself consists in a known manner of a globoid screw with two engaging in the turns Gears that work together with the globoid screw so that the material to be pressed is compressed and is fed to the mouthpiece of the press. ■ -

ίο It is common practice with drum presses to change the degree of compression of the pressed material by the fact that the latter behind the shaping nozzle subject to an adjustable resistor that is generated by a piston playing in the form, its opposite to the direction of movement of the pressed material Directional pressure can be regulated by a counterweight, spring, hydraulic pressure, etc.

If the back pressure of the piston is unintentionally so in this type of press has been regulated that it is too large, the progress of the pressed material can counteracting resistance to a very

^a 5 grow to a considerable height and cause the press to break.

This disadvantage is remedied according to the invention in that the drum is pressed against the mouthpiece of the press. This pressing takes place by springs, weights or the like, which enable the mold to move away from the mouthpiece if the maximum permissible compression of the molded product is unintentionally exceeded. In this case, the pressed material escapes between 45

the mold and the mouthpiece and is automatic by any known device returned to the press.

The drawing shows, for example, an embodiment of the subject matter of the invention illustrated.

Fig. Ι is an overall view of the press.

FIG. 2 is a section taken through the forming drum along line 2-2 in FIG. 1.

The press consists of a globoid screw a, which works together with two helical gears b ¹ , which are surrounded by an outer jacket c , which consists of two parts which are connected to one another ^{by bolts c 1. Two openings c 2} for introducing the material to be pressed are made on the upper part of this jacket.

The screw α is wedged on an axis a ^x . Which is driven in a known manner.

The shapes d are arranged diametrically opposite one another on the circumference of a drum d ^{a rotatable about a horizontal axis.} In each of the molds there is a piston d ^l , which is firmly connected to a transverse shaft ^{d 5} , the ends of which protrude laterally from the drum through grooves d ⁶ on both sides of the drum and are provided with a roller d ¹ .

The drum d ³ is rotatably mounted in stands k , which rest with their lower end in bearings k ^1.

At the lower part of the stand k , two levers I, I ^1, which are firmly connected to one another, are pivotably mounted. These levers are on

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each side of the drum pieces I ² articulated, which have lugs I ³ , l ^l at their ends, which are located between the rollers d ^{1 of} the diametrically opposed pistons d * .

The double levers I, I ¹ are under the action of a spring or an adjustable counterweight I ^s , which acts on arms I ⁵ , which are attached to the levers, so that the

ίο approaches Z ^{3 of} the pieces I ² are pressed against the rollers of the piston, which is located opposite the mouthpiece of the press.

On both sides of the drum, below its axis of rotation, on the uprights k, circular paths m are arranged, which run concentrically to the path covered by the rollers d ¹ and against which these rollers are supported when the pistons are in the end position corresponding to the briquette expressing position.

On each side of the drum d ³ there are two bars j which are firmly connected to the press. On these rods / coil springs j ^{3 are} pushed, which are supported on the one hand against the screw nuts / ^{4 of} the rods j and on the other hand against sleeves 7 ⁶ , which can slide along the rods j.

The stands k of the drum d ³ are supported directly against the sleeves / ⁵ . It can be seen from this that the drum d ³ can move away from the press while the springs j ^{3 are compressed.}

The material emerging from the globoid screw press penetrates into the mold d and thereby drives the piston d ⁱ back, which with the help of the counterweight I ⁶ keeps the briquette under the required pressure.

The piston, which retreats under the action of the molded product, acts through the rollers d ¹ on the pieces I ^s , I ² , the latter pressing against the rollers of the opposite piston and thus pushing the briquette out of the mold. It goes without saying that one must take into account the resistance caused by this briquette ejection, which is added to the resistance of the counterweight I ⁶ and, together with this, determines the limit value for the compression of the briquettes.

If the total resistance that opposes the introduction of the molded product exceeds the limit which is determined by the tension force of the springs j ³ , the drum swings around the axis, k ¹ , whereby breakages of the press are reliably prevented.

The drive of the drum, which enables one mold after the other to be ready for work, can be of any type be.

The subject of the invention can be used in drum presses of any type. The oscillating movement of the drum can also be replaced by a sliding movement. In this case the Drum mounted on sliding guides.

Claims (1)

Patent claim: Drum press for molding plastic masses in which each shape has a piston contains, which counteracts the introduction of the pressed material into the mold, characterized in that that the drum of the press is supported resiliently so that it can move away from the latter when the the penetration of the molded product counteracting resistance becomes too great. 1 sheet of drawings.