JPS6161973B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming longitudinal stripes on containers.

Kotup-shaped paper containers used in filling and packaging machines, etc.
Compared to plastic containers, they are weaker and lack rigidity. In addition, when a high-temperature liquid is filled and sealed, there is a drawback that the seal portion expands and deforms, and the seal portion breaks due to the expansion.

An object of the present invention is to provide a device that can ensure a certain degree of rigidity by forming vertical grooves on a cylindrical paper container.

A paper container creasing device according to the present invention includes a holder shaft that is movably supported in the axial direction and is provided with a small diameter portion and a large diameter portion, and a holder shaft that is attached to the holder shaft so as to be insertable into the inside of a paper container, and that the paper container A mandrel having a concave groove on its outer circumferential surface that serves as a matrix for the concave groove provided in the container, a holding sleeve provided so as to be movable in the axial direction independently of the mandrel, and the number and position of the grooves of the mandrel. A lower roller is rotatably attached to the end of the holding sleeve in correspondence with the groove of the mandrel, and a lower roller that presses the paper container into the groove of the mandrel is provided at the lower end, and a small diameter portion and a large diameter portion of the holder shaft are provided at the upper end. an open/close lever mounted with an engageable upper roller and biased by a spring so that the upper roller engages the outer periphery of the holder shaft; The opening/closing lever is configured to be rotated by engaging the opening/closing lever.

One embodiment of the apparatus for forming the lined container shown in FIG. 1 will be explained in detail with reference to FIG. 2.
The apparatus of this embodiment includes a holder mechanism that fixedly holds a paper container to be scored, a groove forming mechanism that presses and engages the outer periphery of the paper container that is fixedly held, and a drive mechanism that operates these in conjunction. Consists of.

A holder shaft 1 constituting a holder mechanism and a mandrel 2 integrally connected to the lower end of the holder shaft 1 are vertically held together with a holding sleeve 3 (to be described later) by a bearing 5. It is held movably in the axial direction. The mandrel 2 has a plurality of concave grooves 2 on its outer circumferential surface that serve as a matrix.
It is a cylindrical body having a diameter of 1, and is sized and shaped to fit almost tightly into the inside of a paper container to be scored.

A holder shaft 1 to which a mandrel 2 is fixedly connected on the same axis at its lower end is provided with a stepped portion 11 at a predetermined position near the end on the mandrel attachment side, and the diameter is reduced above this stepped portion. In addition, a rack 12 is carved in the upper region of the holder shaft, and a sector gear 7, which will be described later, is provided.
The sector gears are in mesh with each other, and the vertical movement within a certain range is transmitted by the swinging of the sector gears.

The holding sleeve 3 that inserts and holds the holder shaft 1 inside is vertically held on a bearing 5 so as to be vertically slidable, and has a holder part 31 for an opening/closing lever formed at its lower part. A plurality of opening/closing levers 4 are swingably attached to the section.

The opening/closing lever 4 is an arcuate swinging lever whose central point is pivotally connected to the holder part 31 by a pin 41, and has a plurality of swinging levers equally divided in the circumferential direction so as to fit in each of the grooves 21 of the mandrel. Each opening/closing lever 4 is installed in a vertical position in the form of an inward bow, and the upper and lower ends are provided with
Each has an upper roller 42 and a lower roller 43. Further, this opening/closing lever is configured such that the upper roller 42 is always brought into pressure contact with the outer circumferential surface of the holder shaft 1 by the elastic force of a spring 32 provided in the holder portion.
Therefore, as shown in FIG.
A difference in the engagement position of the upper roll 42 occurs due to the difference in the outer diameter of the upper roll 42, and the holding angle of the opening/closing lever 4 changes, thereby allowing the lower roll 43 to press into the concave groove of the mandrel 2. (See Figure 4).

A roller (not shown) attached to the swing end 81 of a swingable drive lever 8 is engaged with the annular groove 35 of the holding sleeve 3, and the swing of the drive lever causes the holding sleeve 3 to move. It is designed to be able to transmit a certain range of lifting and lowering movements.

A detent shaft 33 that stands parallel to the holding sleeve 3 is integrally fixed thereto, and by fitting the detent shaft 33 into the hole 51 of the bearing 5, rotation in the circumferential direction is prevented. It is set as. Furthermore, a stopper 34 is provided on the holding sleeve 3, and the protruding end of this stopper projects into the vertical groove 13 of the holder shaft 1, so that the holder shaft 1 can freely move up and down within the holding sleeve 3. It is slidable, but movement is restricted in the circumferential direction.

The sector gear 7 and the drive lever 8 are each attached to the mounting base 6 so as to be able to swing freely at one point in the center via a support shaft 71 or 82, and each has a rod connected at one end to a drive source (not shown). 72 or 83, the swinging motion within a certain angle range is transmitted. Further, the selector gear 7 and the drive lever 8 are operated separately and in constant coordination.

Next, the operation of this device will be explained with reference to FIGS. 2 and 5. First, the holder shaft 1 and the holding sleeve 3 are kept in the raised position as shown in FIG.
As shown in the figure, the paper container a before being scored is arranged. Here, the sector gear 7 is swung by a predetermined angle in the direction of the arrow, and by meshing with the rack 12, only the holder shaft 1 is lowered downward. As a result, the mandrel 2 at the lower end of the holder shaft is
It fits inside the container a and stops as shown. At the time shown in FIG. 5B, the holding sleeve 3 is left in the raised position, so the upper roller 42 of the opening/closing lever 4 is engaged with the small diameter portion 1' of the holder shaft 1, and the lower roller 43 is naturally in an open state.

Next, the drive lever 8 is swung by a predetermined angle in the direction of the arrow, and the holding sleeve 3, which is pivotally connected to the swiveling end of the drive lever, is lowered downward. As the holding sleeve 3 moves downward, the engagement position of the upper roller 42 of the opening/closing lever gradually moves downward, so that it reaches the step part 11 from the small diameter part 1' and rides on the large diameter part 1''. A swinging motion that displaces the roller 43 inward is applied to the opening/closing lever 4, and the lower roller 43 is pressed toward the mandrel 2. At the time when the lower roller 43 is pressed against the mandrel, the lower roller 43 has just reached the concavity of the mandrel. This is the position where the paper container a starts to engage with the groove 21, and since the paper container a exists between the mandrel 2 and the lower roller 43, the lower roller 43 presses the paper container a along the groove of the mandrel. As the holding sleeve 3 continues to be lowered, the lower roller 4
3 descends to near the lower end of the mandrel as shown in Fig. 5C while being pressed into the groove, and creates a vertical groove b across the entire outer circumferential surface of the paper container a between the mandrel and the lower roller. Shape.

After molding, only the holding sleeve 3 is first raised. As a result, the lower roller 43 rises again while pressing against the paper container a along the concave groove, and repeats the creasing operation again. Then, as shown in FIG. 5D, the lower roller 4
3 reaches the upper end position of the concave groove, the upper roller 42 reaches the stepped portion 11 and can engage with the small diameter portion 1', giving swinging to the opening/closing lever 4, and the lower roller 43 becomes free. state.

When the lower roller 43 leaves the paper container, the holder shaft 1 is also raised, and the mandrel 2 leaves the paper container and returns to the raised position. As a result, the paper container completes the scoring process and remains at the set position.

According to the scoring device of the present invention, which is configured as described above, it is possible to sequentially press and form an arc-shaped recess from one end of the container using the lower roller, and the paper container is damaged when the container is scored. There is no longer any risk of it happening.

[Brief explanation of the drawing]

FIG. 1 shows a lined paper container, in which [A] is a perspective view with a lid attached, [B] is a cross-sectional view thereof,
Fig. 2 is a side view, partially in cross section, of the main structure of the creasing device according to the present invention, Fig. 3 is a partial view illustrating the operation of the opening/closing lever, and Fig. 4 is the same as in Fig. 2.
FIG. 5, which is a top view of the mandrel section in the direction of the arrow, is a partial view showing step by step the creasing process. 1: Holder shaft, 2: Mandrel, 3: Holding sleeve, 4: Open/close lever, 5: Bearing, 6: Mounting base,
7: sector gear, 8: drive lever, a: paper container,
b: Concave groove.

Claims (1)

[Claims] 1. A holder shaft that is movably supported in the axial direction and is provided with a small diameter part and a large diameter part, and a groove base that is attached to the holder shaft so that it can be inserted into the inside of the paper container and is provided in the paper container. a mandrel having a concave groove serving as a mold on its outer peripheral surface; a holding sleeve provided to be movable in the axial direction independently of the mandrel;
is rotatably attached to the end of the holding sleeve in accordance with the number and position of the grooves on the mandrel,
A lower roller for pressing the paper container into the groove of the mandrel is attached to the lower end, and an upper roller that can engage with the small diameter part and the large diameter part of the holder shaft is attached to the upper end,
An opening/closing lever biased by a spring so that the upper roller engages with the outer periphery of the holder shaft, and the upper roller is engaged with the small diameter portion or the large diameter portion to rotate the opening/closing lever. A scoring device for a paper container, characterized in that it is configured as follows.