PH27088A

PH27088A - Apparatus disposed for feeding labels between the mould halves in an injection molder before injecting thermoplastic

Info

Publication number: PH27088A
Application number: PH37539A
Authority: PH
Inventors: Rudolf Gladys
Original assignee: Cerbo Ab
Priority date: 1987-09-18
Filing date: 1988-09-13
Publication date: 1993-02-19
Also published as: SE8703618D0; SE8703618L; KR890004843A; CN1032760A; KR920005522B1; SE467568B

Description

vy APPARATUS DISPOSED FOR FEEDING LABELS

BETWEEN THE MOULD HALVES IN AN INJECTION

__MOLDER BEFORE INJECTING THERMOPLASTIC

DESCRIPTION

Co Jechnical Field

The present invention relates to an apparatus disposed for feeding labels between the mould halves in an injection molder before injecting thermoplastic.

Background art . In injection moulders for the production of such as boxes or box lids, it is known to put labels between the mould halves before injecting ; thermoplastic. Channels are used for this purpose, and they are arranged such as to guide the label from a feed means during its downward passage into contact with a stop means at the mould cavity. ' 1f the labels are smaller than the cavity, the channels forming a channel pair must be movable and must be moved away from each other, and thus also away from the label, before the

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- . yy ' halves come into mutual contact to form the mould cavity. 1f the channels are not moved apart, they will of course be squeezed to destruction between the mould halves.

If the channels are mounted on the stationary half, they will obstruct ejection of the moulded object, which fastens on this half, which is the male half in this case.

To avoid this, the channels can be moved away from each other during the ejection movement, but this means that a new label cannot be permitted to fall down, Bh since it is then not guided by the channels.

The new label is therefore not allowed to fall until the channels have mutually converged, i.e. some time after the product has been ejected.

This ‘ 15 results in waste of time and longer operational / cycles.

A vacuum valve is mounted on the movable half for retaining the label after the channels : have been moved apart.

When the channels are : mounted on the stationary half, the distance > -20 between the valve and the channels varies during / . , x ee —————————————————————————— me ve each operational cycle, resulting in that the : valve has more difficulty in reaching the label.

Disclosure of the Invention

The object of the present invention is to improve earlier known apparatuses of the kind mentioned, and to achieve an apparatus which brings great manufacturing speed and good accessibility to the apparatus in its different parts and to the different parts of the product made in the apparatus.

This object has been achieved by the apparatus in accordance with the invention having been given the distinguishing features disclosed in the characterizing portions of the ~accompaying claims.

Description of Figures -

FIGURE 1 is a sectional side view of an inventive apparatus for feeding flat labels

SL ve between the mould halves in an injection moulder.

FIGURE 2 is a section along the line II-I1 in

FIGURE 1: and .

FIGURE 3 is a section along the line III-I11 in FIGURE 1, but with the halves in another mutually relative position.

Preferred embodiments : The figures mainly illustrate only the °° details of an injection moulder which include the apparatus in accordance with the present invention. Pertaining to the moulder, there are : two mould halves 1 and 2, with moulding surfaces la, 1b and 2a, 2b, together forming two cavities 3, 4 situated one above the other, into which hot, liquid thermoplastic is injected via nozzles 5 ahd 6 mounted in the half 2, while an unillustrated paper or plastics label is in each cavity 3, 4. f The half 2 is stationary, while the half 1 can be moved by unillustrated means between the position ve ‘ illustrated in Figure 1, where the halves are relatively far apart, and the position in Figure / 2, where the halves are in mutual contact for forming the cavities 3 and 4.

When the half 1 is in the position illustrated in Figure 3, a channel 7 rigidly fired > : to the half 1 is above and vertically spaced from ) a channel formed by a channel pair 8. This pair / ‘ comprises two vertical, mutually spaced, U-shaped sections Ba and Bb, with the openings of the sections facing towards each other. The sections ~ Ba and Bb are mounted on the half 1 for mutual, / - horizontal, reciprocatory movement between two : ; positions. In the first position, the mutually opposing web surfaces of the sections are at a spacing slightly larger than the width of a label : E, which is intended for conveyance downwards in the channels 7, B. In the second position the sections Ba and Bb have a large mutual spacing, ’ such that they do not hinder the movement of half 1 : ’ oop oes pa conte Lo

Yoief nt ad

Co Lo ve towards half 2 for forming the cavities X and 4.

In Figure 2, full lines are used to show the sections Ba and Bb at large mutual spacing, , chaindotted lines being used to show the sections ; | at small mutual spacing. The sections are guided by means associated with the moulder for ensuring that they are always mutually parallel, and they . are mutually connected by a tension spring 9, which biases them into their positions illustrated with chaindotted lines.

The sections Ba and 8b can be moved to their positions illustrated with full lines by a mechanism, shown lowest in Figures 1 and 2. This mechanism comprises a contoured body 18 and two rollers 11, one of which is rotatably mounted on section Ba and the other on section Bb. When the half 1 is moved, a distance towards the half 2, the body 18 engages against the rollers 11. For continued movement of the half 1 towards the half 2 the rollers, and accordingly the sections Ba and » | _-- _ b

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Bb, are urged away from each other such that the sections come into recesses 12 in the half 2, and thus do not hinder both female surfaces of half 1 from surrounding both male surfaces of half 2.

At the center of each moulding surface 1a and ib, there is a vacuum valve 13 and 13, which is activated when a label is immediately in front of . the respective cavity 3 and 4, and the sections Ba and Bb have not yet been urged away from each other.

The upper part of half 2 is provided with label stopping means in the shape of two pins 15, which project between the channels 7 and 8 when the halves 1 and 2 are close to each other. The half 1 is provided with label stopping means in to . the shape of two pins 16 which are controlled by photocells in coaction with unillustrated operative means for movement between their stopping position illustrated in Figure 1, where they project out between the sections Ba and 8b - | a ye tc prevent the label E from passing, and a retracted position allowing the label to pass them. The lower ends of the sections 8a and 8b have bottoms Ba’ and Bb’.

The function of the inventive apparatus will now be summarily described.

With the halves 1 and 2 in their positions illustrated in Figure 3, when thermoplastic is injected into the cavities 3 and 4 and labels E {smaller than the cavities) are united with the thermoplastic during moulding, the pins 15 prevent a label, which has been fed out into the channel 7 from a feeding apparatus pertaining to the moulder, from falling down into the channel 8.

During movement by the half 1 away from half 2, this label falls down in the channel 8 until its lower edge rests on the bottoms Ba’ and Bb’. The label has passed the pins 16, which are not activated. Immediately after this label reaches the bottoms Ba' and 8b’, and the half 1 is in 1ts i 5 Ca ” —9- : = mT J

BAD ORIGINAL 9 \ a ‘ :

————————————————————————————————— SR 15 ve left hand end position illustrated in Figure 1, a second label is fed into the channel 7 and is allowed to fall in channels 7 and B8 until its lower edge rests against the pins 16. These pins have been activated by the passage of the preceding label such as to project out between the sections Ba and 8b.

Both labels are now eractly ‘opposite their respective cavity 3, 4. After reversing the movement of the half 1, the body 10 moves the sections Ba and Bb apart via the rollers 11, the vacuum valves 13, 14 being simultaneously activated such that the labels released by the channel are sucked against the moulding surfaces 1a and 1b.

When the half 1 is moved into contact with half 2, for forming the cavities 3 and 4, thermoplastic is injected until the moulded items, e.g. lids or receptacles, are ready shaped and the ’

labels adhered to them.

During this part of the operation, a new label is fed into the channel 7 for coming against the pins 15. After the valves wv - 3 ye 13 and 14 are disabled, the half 1 is moved away . from half 2 while the ready moulded items are ejected and the label stopped by the pins 15 is released.

Although only one embodiment of the inventive apparatus has been described above and illustrated on the drawings, it will be understood that the invention is not restricted to this embodiment, but only by the disclosure of the claims. ~

FIT drab -

Claims

i = . 27088 yy 1 CLAIM:

1. Apparatus disposed for feeding labels. (E) between the mould halves (1,2) in an injection moulder before injecting thermoplastic, at least one half (1) being movable relative the other half (2), there also being a feed means disposed for feeding the labels singlely such that the labels each fail freely on edge and guided along its side edges by a channel pair (8) with its channels extending on either side of the cavity (334) and provided with stop means (Ba, Bb’ j;lé) for arresting the falling label in the region of the cavity, characterized in that the channels (8a,8b) are mounted on the movable half (1) and can be moved from their positions where they guide the labels (E) to positions which are at greater mutual spacing and which are spaced from the cavity (334).

2. Apparatus as claimed in claim i, cy oo . -12-

characterized in that the movable half (1) contains the female part of the cavity (3;4).

3. Apparatus as claimed in claim 1, characterized in that the movable half (1) is provided with a vacuum valve (13;14) for retaining the label (E) after the channels (8a, 8b) have been moved away from each other. : RUDOLF GLADYS ; Inventor } ~ JS 4 \ i