JPH0397522A - Blow molding mold label supply device - Google Patents

Abstract

PURPOSE:To reliably supply labels one by one into a blow mold and prevent a loss of labels and double labeling by disposing the label sucking part of an in-mold label supply head in such positioning relationship that the label sucking part is separated from label holders but it can be contacted with the suction surfaces of a label withdrawing/sucking boards. CONSTITUTION:Each label holder 1 and each label withdrawing/sucking board 2 are first rotated in alignment, and a label A at the opening of the label holder is sucked to the label withdrawing/sucking board opposed to said opening from the side of the direction in which rotation progresses. Further, a label sucking area on the sucking board increases accompanying the progress of rotation, and the label is sucked by and transferred to the sucking board so that the label is torn off and taken out. When the suction and transfer of the label to the sucking board are finished, the rotation in alignment between the label holder 1 and the sucking board is stopped, and then, the label sucking part of an in-mold label supply head 3 sucks and receives the label from the sucking board 2. Thereafter, the label is transferred from the label sucking part to the inner surface of a blow mold 6 and sucked thereto, and simultaneously with blow molding, the label is reliably stuck on the rear surface of a molded product.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applied to a blow-molding tool for in-mold labeling, which applies a label to the surface of a synthetic resin blow-molded product at the same time as molding in the blow-molding mold. The present invention relates to a label supply device.

(Prior Art) Apparatuses for feeding labels into blow molding molds in in-mold labeling have been proposed in Japanese Patent Publication No. 47-43622, Japanese Utility Model Publication No. 47-32823, and the like.

In these conventional technologies, although the means for supplying the label into the mold by the in-mold label supply head are different, the methods for taking out the label from the label holder are all the same.
A structure is shown in which the label in the label holder opening is directly sucked onto the label suction surface of the in-mold supply head, and is pulled out in a direction perpendicular to the label surface using an air cylinder.

The multiple labels stored in the label holder are pushed toward the front opening by a force such as a spring, and there are multiple hooks around the opening to prevent the labels from flying out. (Jikko Sho 47-32)
823).

(Problems to be Solved by the Invention) However, when looking at the above-mentioned prior art, when a label is taken out from the label holder opening, the label is directly attracted by the attraction surface of the label supply head, and the label is drawn in a direction perpendicular to the label surface. When the frontmost label is pulled out, a suction force due to negative pressure is generated between it and the next label and the next label, causing the labels to stick to each other and two or more labels to be pulled out at the same time. There's a problem.

That is, a hook is provided around the opening of the label holder to prevent the labels from flying out, and the labels are overlapped in close contact with each other.

However, if you try to pull out the frontmost label in a direction perpendicular to the label surface using the suction surface of the label supply head, outside air will enter between the frontmost label and the following labels from the outer edge of the label. As a result, negative pressure is generated between the labels, which creates a suction force, and if the labels are pulled out in a direction perpendicular to the label surface while this suction force is generated, multiple labels may be pulled out at the same time. do.

As a result of this simultaneous removal of multiple labels, problems occur such as pasting of two labels resulting in defective molding, or excess removed labels falling during transfer to the mold and resulting in loss. As the thickness of the label decreases, its rigidity decreases, and it becomes more easily deformed, the frequency of occurrence of these defects increases.

The present invention has been made in view of the above-mentioned problems, and is an in-mold label supply device for in-mold labeling that applies labels at the same time as blow molding. It is an object of the present invention to provide an apparatus that supplies labels one by one and does not produce label losses or defective products (two labels pasted together).

(Means for Solving the Problems) In order to solve the above problems, in the blow molding mold label supply device of the present invention, the label in the label holder is directly attracted to the mold supply head in a direction perpendicular to the label surface. Instead of removing the label at the same time, the label is removed by peeling it off from the edge using a label removal suction cup that rotates in synchronization with the label holder.

In other words, it is a label feeding device inside a blow molding mold for in-mold labeling, which supplies a label taken out from a label holder to the inner surface of the cavity of a blow molding mold, and attaches a label to the surface of a synthetic resin molded product at the same time as flow molding. The label holder is movable forward and backward, and after entering between the blow molding mold which is open when moving forward, the label suction part is advanced toward the inner surface of the cavity of the blow molding mold. and an in-mold label supply head that supplies labels to the inner surface of the cavity, wherein a label take-out suction cup is provided between the in-mold label supply head and the label holder, and the label take-out suction cup and the label holder can rotate at the same circumferential speed, and when both rotate and come into contact with the suction surface of the label take-out suction cup or the most unusual label surface within the label holder, the label will be suctioned. The label suction section of the in-mold label supply head is arranged in such a position that the adsorbed label can be removed from the label holder when the suction surface separates from the label holder as both rotate. is arranged in a positional relationship that allows it to come into contact with the suction surface of the label retrieval suction cup at a position different from the label holder.

(Function) When feeding labels one by one into the mold cavity using the in-mold labeling device for blow molding of the present invention configured by the above means, first, the label holder and the label are fed into the mold cavity one by one. The take-out suction cup rotates synchronously at the same circumferential speed, and the label in the label holder opening is attracted to the label take-out suction cup facing from the direction of rotation, and as the rotation progresses, the label suction area to the suction cup increases. increases, and the label is suctioned and transferred to a suction cup so that it can be turned over and taken out.

In this way, the label is taken out from the label holder by flipping it over from the edge and using the suction cup, so the outside air easily enters between the label in contact with the suction cup and the next label, and the suction due to negative pressure is generated. No force is generated, and the labels are reliably taken out one by one from the label holder by being attracted to the suction cup.

When the suction transfer of the label to the suction cup is completed, the synchronized rotation of the label holder and the suction cup stops, and then the label suction part of the in-mold label supply head suctions and receives the label from the suction cup. The label is transferred and adsorbed from the suction part to the inner surface of the blow molding mold, and the label stickiness is reliably applied to the surface of the molded product at the same time as blow molding.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing a label feeding device in a blow molding mold according to an embodiment of the present invention when labels are attached to both sides of a molded product.

Reference numeral 1 in FIG. 1 indicates a label holder, and this label holder 1 stores a large number of labels A. One end of the label holder 1 is opened, and the periphery of the opening has a holder for holding the periphery of the labels. Claws 12 are provided at several locations, and the label holder 1 is constantly pressed by a pressing force such as a spring.
A pusher 13 is provided for pressing the label A in the opening direction with a force that does not cause the label A inside to fall off.

Further, the label holder 1 can be freely rotated by a support shaft 14 provided on the center line at the rear of the lower surface thereof.

Reference numeral 2 in FIG. 1 denotes a label take-out suction cup for flipping and taking out labels one by one from the label holder 1, and has an arc-shaped suction surface 21, and the suction surface 21 has an air intake hole 2.
2 has a plurality of openings radially, and is piped to an intake supply source (for example, a vacuum pump).

In addition, there is a suction surface 2 on the bottom surface of this label take-out suction cup 2.
A support shaft 23 located at the center of the arc 1 is provided, and this support shaft 23 is directly connected to a drive unit that repeatedly rotates from side to side, such as a rotary actuator operated by air pressure. A gear 25 having the support shaft 23 as the center is attached to the shaft.

On the other hand, a sector-shaped gear 15 having the support shaft 14 at the center is also attached to the lower surface of the label holder 1 so as to mesh with the gear 25 of the label take-out suction cup 2.

The label holder 1 and the label take-out suction cup 2 are arranged so that the label surface at the open end of the label holder 1 and the suction surface 21 of the label take-out suction cup 2 are in face-to-face contact with each other.
Paired with each other around the respective support shafts 14.23,
It is arranged to rotate synchronously left and right.

3 in Fig. 1 is an in-mold label supply head that supplies labels into the blow molding mold, and is attached to a drive unit such as an air cylinder 4, and is further provided with guide shafts 5 provided on both sides.
．． 5', it slides back and forth.

In addition, an air cylinder 3 is installed in the in-mold label supply head 3.
Suction heads 32 and 32 are provided which open and close (extend and contract or move forward and backward) to the left and right respectively by driving means of the first class, and the suction surface 33 of each suction head 32 has a plurality of intake holes 34 located above and below. It's open. Then, when this in-mold label supply head 3 is located at the rear,
When the suction heads 32 and 32 are opened (each suction head 32 moves forward), the suction head 32 contacts the suction surface 21 of the label removal suction cup 2 which is in a stopped state after adsorbing the label, and when the suction head 32 is located forward, the suction head 32 When opened, each suction surface 33
The blow molding mold 6, 6 is divided into two parts and opened to the left and right.
The intake holes 61 on the inner surface of the cavity 1 are arranged so as to come into contact with the labeling position surface which is opened at a plurality of locations.

In addition, if it is necessary to supply labels to the inner surfaces of both cavities of the blow molding molds 6 and 6' which are divided into two parts (
In other words, when it is necessary to attach labels to both sides of the blow-molded product, as shown in Fig. In the case where it is sufficient to provide two suction heads 32 in the in-mold label supply head 3 and to supply the label to the inner surface of one cavity of the blow molding mold 6 and 6'. (In other words, if the label only needs to be pasted on one side of the blow-molded product), one set of the label holder 1 and the label take-out suction cup 2 may be provided on one side of the in-mold label supply head 3. , one suction head 32 may also be provided on the same side.

Next, the action (movement) of the embodiment will be explained.

In the above-mentioned in-mold label supply device, the movements of each part are interlocked as follows by sequence control.

FIGS. 2 to 4 show a state in which a label is transferred and sucked from the label holder 1 via the label suction cup 2 to the in-mold label supply head 3. Also, the fifth
6 to 6 show the state in which the label A is supplied into the blow molding mold 6.

First, when the device is switched on, the drive section of the rotary actuator is activated, and from the state shown in Fig. 1, the label holder 1 and the label take-out suction cup 2 become a pair and begin to rotate relatively slowly in synchronization, and at the same time they are sucked. Air intake hole 2 on surface 21
2, the label at the open end of the label holder 1 starts to be attracted from the side in the direction of rotation to the plurality of air intake holes 22 provided radially on the adsorption surface 21 that comes into contact with each other, and as the rotation progresses further. , the intake hole 2 next to the suction surface 21
The adsorption to 2 begins, and as shown in Figure 2, the frontmost 1
A sheet of label A is turned over and taken out from the end in the direction of rotation, and is sucked and transferred to a label take-out suction cup 2.

When the suction transfer is completed and the suctioned label A comes to a position facing the suction surface 33 of the suction head 32 of the in-mold label supply head 3, the rotation is stopped by a stopper (not shown).

At the same time as this stop, the intake hole 3 of each suction head 32.
4, the suction head 32.32 advances toward the label take-out suction cup 2 and opens a certain stroke, and as shown in FIG. The intake hole 34 makes contact.

Thereafter, the vacuum in the intake hole 22 of the label take-out suction cup 2 is stopped, and compressed air is instead blown out for a short time, whereby the label A is completely transferred and suctioned to the suction head 32.

When the transfer adsorption is completed, as shown in Figure 4,
In order to maintain the suction of the label A, the suction head 32, 32 is retreated in the direction away from the label take-out suction cup 2, contrary to the above, while the vacuum is still applied to the suction hole 34, and the suction head 32, 32 is closed.

Next, when the label holder 1 and the label take-out suction cup 2 rotate synchronously in opposite directions and return to their original positions, the in-mold label supply head 3 starts moving forward by the air cylinder 4, as shown in FIG. Blow molding mold that opens left and right 6.6
When it reaches the labeling position inside the cavity, it is stopped by a stopper (not shown).

Then, as shown in FIG. 6, the suction head 32 opens (
(advancement or extension), label A is pressed against the inner surface of the cavity. At this time, a vacuum is working in advance on the intake holes 61 that are open at multiple locations on the inner surface of the cavity, and after the label A is pressed, the vacuum of the suction head 32 is cut off, and the suction head 32 is placed at a predetermined position on the inner surface of the cavity. After the label A is suctioned, the suction head 32 closes (retreats or contracts), and the in-mold label supply head 3 retracts and returns to its original position.

With the above operations, label supply into the mold is completed.

In this way, the bell A is attracted to the inner surface of the cavity.
is attached to the surface of the molded product by the heat of the molded product at the same time as blow molding in the next blow molding process.

After this molding process is completed, the blow molding mold 6
．． By the time 6' opens left and right, the label A has been suction-transferred from the label holder 1 to the in-mold label supply head 3 via the label take-out suction cup 2.
Waiting to be fed into the next mold.

As explained above, the in-blow mold label supply device of the embodiment has the features listed below.

■ The embodiment device does not directly adsorb the label in the label holder 1 to the in-mold label supply head 3 and pull it out in a direction perpendicular to the label surface, as in the conventional device, but instead rotates in synchronization with the label holder 1. Since the device uses a label removal suction cup 2 to take out the label A from the edge in a flipping manner, there is no suction force due to negative pressure between it and the next label, and the label A is reliably removed one by one from the label holder 1. It can be taken out.

As a result, the frequency of occurrence of defects such as pasting of two sheets resulting in defective molded products, and excess labels being removed resulting in label loss falling during transfer to the mold has been significantly reduced.

In particular, a significant reduction in the frequency of defects was observed for thin labels.

■ Since the label suction surface 33 of the in-mold label supply head 3 comes into contact with the suction surface 21 of the label take-out suction cup 2 when the label suction head 32 is in the forward position, the in-mold label supply head 3 is easily arranged so as not to come into contact with the label take-out suction cup 2 when moving forward and backward.

As a result, there is no need for a device that moves the label take-out suction cup 2 away from the in-mold label supply head 3, and flexibility in layout, miniaturization of the device, and cost advantages are achieved.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are design changes within the scope of the gist of the present invention, they are included in the present invention. It will be done.

For example, in the embodiment, the intake hole 22 of the label take-out suction cup 2 and the label supply head 3 in the mold. 34, if the label adsorption performance is poor, the adsorption performance can be improved by embedding pads made of a flexible material such as rubber in the intake holes 22 and 34 and leaving the tips slightly out of the adsorption surface. can.

(Effects of the Invention) As explained above, in the present invention, in the label feeding device in the blow molding mold for in-mold labeling that applies labels at the same time as blow molding, the label in the label holder is directly applied. The blow molding mold is designed to take out the label by peeling it off from the edge using a label take-out suction cup that rotates in synchrony with the label holder, instead of having the label sucked by the supply head inside the mold and pulled out in a direction perpendicular to the label suction surface. It is possible to provide an apparatus that reliably supplies labels one by one into the inside of the printer, and does not produce label losses or defective products (two labels pasted together).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a label supply device in a blow molding mold according to an embodiment of the present invention, and FIG. Figure 3. Figures 4 and 5. FIG. 6 is a plan view showing the operating state of each part. A...Label 1...Label holder 15...Gear 2...Label take-out suction cup 21-...Adsorption surface 22...Intake hole 25...Gear 3...In-mold supply head 31... Air cylinder 32... Suction head 33... Suction surface 34... Suction hole 4... Air cylinder 5, 5'... Guide shaft 6.6'... Blow molding mold

Claims (1)

[Claims] 1) A blow molding tool for in-mold labeling, in which a label taken out from a label holder is supplied to the inner surface of a cavity of a blow molding mold, and a label is attached to the surface of a synthetic resin molded product at the same time as blow molding. An in-mold label supply device that can move forward and backward with a label holder, enters between the blow molding molds that are open when moving forward, and then adsorbs labels toward the inner surface of the cavity of the blow molding molds. and an in-mold label supply head that advances a section to supply the label to the inner surface of the cavity, wherein a label take-out suction cup is provided between the in-mold label supply head and the label holder. The label take-out suction cup and the label holder can rotate at the same circumferential speed, and when both rotate and the suction surface of the label take-out suction cup contacts the outermost label surface in the label holder. is arranged in a positional relationship such that the label can be sucked into the label holder, and when the suction surface separates from the label holder as both rotate, the sucked label can be taken out from inside the label holder; A label feeding device in a blow molding mold, characterized in that a label suction section of the head is arranged in a positional relationship that allows it to come into contact with a suction surface of the label take-out suction cup at a position different from the label holder. 2) Claim 1 characterized in that the label suction part of the in-mold label supply head comes into contact with the suction surface of the label take-out suction cup when the label suction part is placed in the forward position.
Label supply device in a blow molding mold as described in 2.