JPH1034880A - Blow-molded container and chucking unit of printer for container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely eliminate a printing deviation by forming a bottom end wall and a flat bottom wall recessed from the end wall at a bottom of a container, and forming a pair of wide positioning protrusions of a rectangular sectional shape sandwiching a bottom central part at the flat bottom wall. SOLUTION: In the case of mounting a container A at a chucking unit, a bottom end wall 4 of the container A and a lower end of a body of the container are positioned to match to an embracing circumferential wall 11 of a holding base C. When it is pressed by a retaining member, the wall 4 is pressed to a placing part 12. A protruding part 13 is connected to a flat bottom wall 5 of the container thereby to sandwich the container A in the chucking unit. In this case, the container A can be effectively positioned in its elliptical circumferential direction by engaging the wall 11 of the base C with an outer periphery of the lower end of a container body 1 and engaging grooves 14a, 14b provided at the part 13 of the base C with protrusions 7a, 7b of the container A. Particularly, the protrusions 7a, 7b are formed in a wide rectangular sectional shape to enhance their strengths. Since the protrusions are respectively engaged with the grooves, positioning becomes effective.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for aligning a printing position of a container in a printing machine for a blow-molded container, and a blow-molded container suitable for alignment.

[0002]

2. Description of the Related Art As a container chucking device for a blow-molded container printing machine, a concave bottom wall having a shape that is gradually curved and depressed inwardly of a container and a protrusion provided along the major axis of the ellipse are provided at the bottom of the container. The container is provided with a holding peripheral wall conforming to the shape of the lower end portion and the bottom end portion of the container body, and an engaging groove in which the ridge fits in the center. 2. Description of the Related Art A chuck device provided with a positioning mechanism including a positioning member having a projection conforming to the shape of a concave bottom wall of the above has been conventionally known as disclosed in Japanese Utility Model Publication No. 52-566, for example.

In the prior art described in the above publication, an oval container bottom is held by a holding peripheral wall, and a ridge on the container bottom is fitted into an engagement groove provided in a positioning member.
Positioning is assured, and the container does not rotate at all with respect to the chuck device during the printing process. There is an excellent effect that high-quality printing can be performed efficiently, for example, there is no need to pay attention to the alignment of the printing.

[0004]

However, recently,
The demands of consumers on the printing position, printing misregistration in the case of multi-color printing, and the printing surface of the container are increasing, and strict restrictions are imposed. In the above-described conventional container, since the positioning is performed by the positioning member provided with the engaging peripheral wall and the engaging groove to be fitted to the ridge of the container, the printing misalignment is about 1 mm, and sometimes the printing position shift exceeds the allowable limit. There was a problem that non-defective products might be produced. In addition, since the holding peripheral wall is provided over the entire circumference and covers the outer periphery of the lower end portion of the container body to a certain height and holds the container, there is a problem that printing cannot be performed up to the lower end surface of the body portion. Also, since the ridges on the bottom of the container are provided along the major axis of the ellipse and over the entire length of the concave bottom wall, marking or printing the mark, character, etc. on the bottom is restricted by the display location, especially A problem has arisen that the bottom center cannot be used as a display surface.

SUMMARY OF THE INVENTION The present invention overcomes the above-described problems, suppresses the range of printing misregistration to 0.15 mm, substantially eliminates printing misregistration, and enables printing to the lower end of the container body. It is an object of the present invention to provide an improved elliptical blow molded container and a container chuck device of a printing press used for printing the improved container.

[0006]

In order to achieve the above technical object, the present invention provides a blow molded container having a bottom end wall and a flat bottom wall recessed from the bottom end wall at the bottom of the container. The flat bottom wall has a configuration in which a pair of rectangular cross-sections and a wide positioning protrusion are formed across the bottom center portion, or a flat bottom wall that is continuous with the container body at the bottom of the container. A concave bottom wall which is depressed at the center of the flat bottom wall and whose center is flattened is formed, and the flat bottom wall has a trapezoidal groove having an end opening along the parting line at the peripheral wall of the concave bottom wall. A configuration characterized by being provided is adopted.

[0007] Further, as a chuck device of a container printing machine, a holding surface conforming to the shape of a container bottom wall and a peripheral edge of the holding surface are provided upright from a peripheral edge of the holding surface within a predetermined angle range for holding an outer periphery of a lower end portion of a container body. Forming a holding peripheral wall having a range as a cutout portion, and a positioning groove or a projection fitted to a positioning projection or a groove provided on the container bottom wall on the holding surface. A chuck device provided with a holding table to be used is adopted.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which a container is mounted on a chuck device of a printing press. In the figure, A is a container, B is a chuck device attached to a printing press main body (not shown), and C is a chuck device. And D, a holding member for pressing and holding the container to the holding table.

As shown in FIG. 2, the container A includes a container body 1.
And a container opening 2 and a container bottom 3, which are formed by blow molding using synthetic resin as a raw material. The bottom wall of the container bottom 3 is composed of a bottom end wall 4 connected to the container body 1 and a flat bottom wall 5 at a position depressed from the bottom end, and sandwiches the bottom central portion 6 along a parting line of the bottom wall. A pair of positioning projections 7a and 7b are formed. The projections 7a and 7b are rectangular projections having a cross section protruding from the flat bottom wall 5, and the width thereof is wider than that of a normal bottom rib for sealing, and is 5 mm in this embodiment.

As shown in FIG. 3, the holding table C has a holding surface 10 formed in the same shape as the surface of the bottom wall of the container bottom, and a holding peripheral wall 11 for holding the outer periphery of the lower end of the container body 1. Are formed. On the holding surface 10, there are formed a peripheral mounting portion 12 supporting the bottom end wall 4, a raised portion 13 supporting the flat bottom wall 5, and concave grooves 14a, b into which the convex portions 7a, b are fitted. Have been. Further, the two grooves may be one continuous linear groove. The holding peripheral wall 11 is erected from the periphery of the holding surface within a predetermined angle range below the holding table peripheral surface, and holds the lower end of the container body to a certain height, and corresponds to the printing surface of the container. A predetermined range above the elliptical circumference is a cutout 15.

Reference numeral 16 denotes a mounting shaft for mounting the holding table C to the chuck device B. The holding table C is mounted on the chuck device B by a suitable mounting means. The chuck device B is swingably attached to a printing press main body (not shown), and the entire chuck device makes a certain range of rotation around a reference trajectory with respect to a reference point of the printing press main body. I have.

As shown in FIG. 1, a mounting plate 21 for a pressing member D is provided at an end of a supporting member 20 integrated with the chuck device B. The holding member D includes a holding member 22 and a shaft 23, and the shaft 23 is slidably supported by the mounting plate 21. The holding member D is operated by a suitable operating mechanism (not shown) provided on the supporting member 20 so as to press the container against the holding table.

Next, the operation and effect of the above configuration will be described. When attaching the container to the chuck device, the bottom end wall 4 of the container and the lower end of the container body are held by the holding peripheral wall 11 of the holding table C.
When pressed by the holding member D, the bottom end wall 4 is pressed by the mounting portion 12, and the raised portion 13 is joined to the container bottom wall, whereby the container is clamped and mounted on the chuck device. At this time, the positioning of the container in the elliptical circumferential direction is performed by engaging the holding peripheral wall 11 of the holding table C with the outer periphery of the lower end portion of the container body and forming the concave groove 14a provided in the raised portion 13 of the holding table C. , 14b are fitted to the protrusions 7a, 7b of the container A, so that the operation can be surely performed.

Particularly, since the convex portion 7 is formed in a wide rectangular cross section and has high strength, and the concave groove 14 is fitted to the convex portion 7, positioning is effective, and holding is possible. Even if the peripheral wall 11 is not formed over the entire circumference, reliable positioning can be performed. As a result, the range of printing misregistration is limited to 0.15 mm, so that in multicolor printing, there is substantially no misalignment in printing, and clear printing can be performed. Further, the upper portion of the holding peripheral wall corresponding to the printing surface of the container is cut out to form the cutout portion 15, so that printing can be performed up to the lower end portion of the container body.

Next, another embodiment in which a positioning concave portion is provided on the bottom surface of the container will be described. The container of the present embodiment is
An elliptical blow-molded container formed by two-stage blow molding using PET as the material resin. The positioning recess is formed by separating the mold while moving the lower mold, forming a deep recess. Have been. In FIG. 4, the bottom 3a of the container A1 has a flat flat bottom wall 31 continuing to the lower end of the container body 1a, and a circular concave bottom wall 32 having a flat bottom central portion depressed at the center of the flat bottom wall. The flat bottom wall 31 has a groove 33 having a trapezoidal cross section and having an end opening along the parting line at the peripheral wall of the concave bottom wall 32.
Is provided.

As shown in FIG. 5, the holding table C1 has a holding surface 40 conforming to the shape of the container bottom and a holding peripheral wall 41 for holding the outer periphery of the lower end of the container body 1a. Has a flat holding surface 42, a circular ridge 43 engaging the concave bottom wall 32, and a holding surface 42 on the side of the ridge.
Protruding part 4 having a trapezoidal cross section that projects from the
4 are provided. The holding peripheral wall 41 is erected from the peripheral edge of the holding surface within a predetermined angle range in the lower part of the peripheral surface of the holding table so as to hold the lower end of the container body to a certain height. A certain range above the corresponding elliptical circumference is a cutout 45. At the time of positioning and printing of the container, the same operation and effect as those of the above-described embodiment can be obtained. In particular, when the depth of the concave bottom wall 32 and the depth and width of the concave groove portion 33 are increased, a holding table is formed correspondingly. Even better effects can be obtained.

[0017]

Since the present invention is configured as described above, it has the following effects. On the container bottom, a pair of positioning projections or concave grooves is formed with the bottom center part interposed therebetween, and on the holding table of the chuck device, a holding peripheral wall for holding the container outer periphery,
Since the holding surface is provided with positioning grooves or projections that fit into the positioning protrusions or grooves provided on the container bottom wall, positioning is assured, and printing misalignment is completely eliminated. Now you can do it. Since the fixed area above the elliptical circumference of the holding peripheral wall is defined as the cutout part, it is possible to print up to the lower end of the container body. Since the positioning protrusion or groove is not formed at the center of the bottom, the center of the bottom can be used as a display surface.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an outline of the present invention.

FIG. 2 is a view showing a container, (a) is a partial cross-sectional front view,
(B) is a bottom view.

3A and 3B are drawings showing a holding table, wherein FIG. 3A is a partial cross-sectional front view, FIG. 3B is a left side view, and FIG. 3C is a cross-sectional view taken along line AA of FIG.

4A and 4B are drawings showing a container according to another embodiment, wherein FIG. 4A is a front view and FIG. 4B is a bottom view.

5A and 5B are drawings showing a holding table, wherein FIG. 5A is a partial cross-sectional front view, FIG. 5B is a left side view, and FIG. 5C is a cross-sectional view taken along line AA in FIG.

[Explanation of symbols]

 A, A1 Container B Chuck device C, C1 Holder D Holding member 1 Container trunk 2 Container mouth 3 Container bottom 4 Bottom end wall 5, 31 Flat bottom wall 7 a, b Positioning projection 10, 40 Holding surface 11, 41 Circumferential peripheral wall 12 Placement portion 13, 43 Raised portion 14a, b Groove groove 15, 45 Missing portion 32 Concave bottom wall 33 Groove portion 44 Raise

Claims (3)

[Claims] 1. A bottom end wall and a flat bottom wall depressed from the bottom end wall are formed on the bottom of the container, and a pair of positioning projections having a pair of rectangular cross sections and a wide width with a bottom center portion interposed therebetween. A blow molded container characterized by forming: 2. A flat bottom wall which is continuous with the container body and a concave bottom wall which is depressed at the center of the flat bottom wall and has a flat center at the bottom of the container. A blow-molded container provided with a positioning groove having a trapezoidal cross section that opens in a peripheral wall of a bottom wall. 3. A chuck device for a container printing machine,
A holding surface conforming to the shape of the container bottom wall, and a holding peripheral wall which is erected from the periphery of the holding surface within a predetermined angle range for holding the outer periphery of the lower end portion of the container body and has a certain range as a cutout portion are formed. A chucking device for a printing machine for a container having a holding table, wherein the holding surface is provided with a positioning groove or a projection that fits into a positioning protrusion or a groove provided on a container bottom wall. .