JPS6010788B2 - Holding spindle for cylindrical containers in printing and painting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding spindle for a cylindrical container when printing or painting the outer peripheral surface of a thin-walled cylindrical container with an elastic bottom, such as an empty can for cans, a plastic cup, or a tube. be.

Thin-walled cylindrical containers with elastic bottoms are easily deformed by external forces. It is necessary to hold and transport the cylindrical container in a state where the painting or printing pressure that should be applied to the surface can be applied correctly to the outer peripheral surface of the cylindrical container while preventing deformation of the cylindrical container. As a holding spindle the printing/painting machine is equipped with.

The holding spindle is usually made of plastic, metal, ceramic, or a combination of other materials depending on the material of the cylindrical container. For example, when the inner diameter of the cylindrical container is 20 to 10W, the outer body of the spindle is made to have a small diameter on the 0'1 to 0.5 side relative to the inner diameter of the cylindrical container. That is, there is a slight gap between the chest of the cylindrical container and the outer body of the holding spindle when the cylindrical container is inserted and seated on the holding spindle, but this gap adversely affects the quality of decoration during the printing and painting process. The steel alloy is selected to have a loose iron fitting. Generally, the cylindrical container inserted and seated on the holding spindle is placed inside the holding spindle in order to maintain the correct seating posture and position during the processing and transportation processes where the necessary printing and painting processes are performed. The structure is such that the bottom end of the cylindrical container is attracted and held at the tip of the holding spindle by vacuum pressure supplied from the base end.

By the way, the conventional primitive holding spindle A is applied to an empty two-piece can a in which the inner bottom surface 10a of the can bottom 10 is recessed into a dome shape as a cylindrical container, and a connecting radius portion 14 with the can holder 12 is formed around the periphery. Referring to FIG. 1, the tip periphery 16a of the spindle eye 16 is located between the can body 12 and the can bottom 1.
The suction hole 1 is in direct contact with the boundary connecting radius portion 14 with
It serves both as a sealing action when the empty can 12 is suctioned and seated by the vacuum pressure supplied from 8, and as a positioning jig for accurately determining the seating position of the empty can a.

However, the holding spindle A equipped with the empty can a is
The paint roller installed in the printing/painting station of the paint sprayer is now in contact with the printing bracket Z and the empty can a is rolling.
The outer circumferential surface is decorated, but as mentioned above, firstly, there is a slight gap between the inner diameter of the empty can a and the diameter of the spindle body 16 of the holding spindle A, and secondly, the rotational speed of the holding spindle A As a result, a speed difference may be provided between the rotational speed of the coating roller and the printing bracket if necessary from the viewpoint of decorative technology or unavoidably due to the difference in rotational inertia. Slight slippage often occurs between the holding spindle A and the empty can a.

This slipping phenomenon is caused by the vacuum sealing effect between the connecting radius part 14 of the empty can a and the peripheral edge 16a of the tip of the holding spindle 16, which has a relatively stronger Ayatate pressure than other parts. Empty can a is damaged by causing damage to empty can a.
On the other hand, the tip periphery 16a of the holding spindle 16 is worn, impairing its function as a seating position gauge and vacuum seal for the empty can a.

In order to prevent these phenomena, various measures have been taken in the past. For example, as shown in FIG. The means to prevent the empty can a from being scratched by making it an integral structure made of soft plastic material has the disadvantage that the abrasion resistance of the tip periphery 20a of the holding spindle B is further weakened. Empty cans can be made of ceramic, cemented carbide, or alloyed steel, or if other extremely hard materials or treatments are used to improve wear resistance, such as chrome plating, anodizing, or other surface treatments. This resulted in the disadvantage that the incidence of scratches on A was increased.

Further, the holding spindle C shown in FIG.
In 4, the sleeve outer body 26 was fitted with a ball bearing 28 so that it could rotate freely, and an attempt was made to make it easier to rotate following the rotation of the empty can a, and to minimize the slippage between the sleeve outer arm 26 and the empty can a. Again, the drawbacks of the holding spindles A and B shown in FIGS. 1 and 2 have not been eliminated.

A first object of the present invention is to provide a holding spindle for a cylindrical container that can accurately and sharply print or paint a predetermined position on the outer peripheral surface of a cylindrical container at high speed. A second object of the present invention is to provide a holding spindle for a cylindrical container that provides a cylindrical container of excellent quality that does not damage the inner surface of the cylindrical container during printing and painting.

A third object of the present invention is to hold the cylindrical container without contacting the tip end edge of the holding spindle with the inner bottom edge of the bottom end of the cylindrical container, thereby eliminating wear of the tip end edge of the holding spindle and eliminating frequent wear of the holding spindle. Printing/repair/replacement
It is an object of the present invention to provide a holding spindle for a cylindrical container that does not cause a decrease in the operating rate of a coating machine.

A fourth object of the present invention is to perform two-part holding by a combination of two holding members: a sleeve outer body that holds the inner peripheral surface of the body of the cylindrical container, and a bottom support pad that sucks and holds the bottom surface of the cylindrical container. The present invention aims to provide a holding spindle for a cylindrical container.

A fifth object of the present invention is to provide a cylindrical container holding spindle that is particularly effective for thin-walled cylindrical containers with elastic bottoms such as two-piece empty cans.

A sixth object of the present invention is to provide a holding spindle for a cylindrical container in which the seating position of the cylindrical container relative to the holding spindle is stabilized by vacuum suction and holding force.

A seventh object of the present invention is to provide a holding spindle for a cylindrical container, which has a bottom receiving pad that matches the shape of the inner bottom surface of the bottom end of the cylindrical container to exhibit a sealing effect and is easily detachable and replaceable. This is what we intend to provide.

An eighth object of the present invention is to provide a holding spindle in which the sleeve outer shell of the holding member and the bottom receiving pad are integrally configured to rotate integrally.

A ninth object of the present invention is to provide a holding spindle in which the sleeve outer body and the bottom support pad of the holding member are constructed as independent and separate structures and are separately rotatable.

Other objects of the present invention will become apparent upon consideration of the specification and drawings attached to this application.

FIGS. 1 to 3 are longitudinal cross-sectional views of main parts of various conventional holding spindles equipped with empty two-piece cans. FIG. 4 is a partially central vertical sectional view showing the first embodiment of the present invention equipped with an empty two-piece can.

FIG. 5 is a partially central vertical sectional view showing a second embodiment of the present invention equipped with an empty two-piece can.

The holding spindle for the cylindrical container in printing and painting of the present invention, in rotatably holding the cylindrical container during printing and painting, keeps the periphery of the inner bottom surface of the bottom end of the cylindrical container in a non-contact state where no rotational contact friction force occurs. The hollow spindle shaft is held within the body of the cylindrical container so that it can rotate freely following the rotation of the cylindrical container, and at the same time, the inner bottom surface of the bottom end is also held in suction contact so as to be able to rotate freely and follow the rotation of the cylindrical container. An outer sleeve that holds the inner peripheral surface of the arm of the cylindrical container so that it can be inserted and removed freely, and a bottom pad that has a suction port in the center of the receiving surface that suctions and holds the bottom end of the cylindrical container. is attached to the hollow spindle shaft so as to be freely rotatable.

Here, a first specific embodiment of the holding spindle of the present invention to which an empty two-piece can a, which is a representative example of a thin-walled cylindrical container with an elastic bottom, is applied will be described with reference to FIG.

The empty can holding spindle D of the present invention has an outer peripheral flange 34 of a hollow spindle shaft 32 that passes through a suction hole 30 along the entire length of the center.
The base 36 is cantilevered into the side surface of the spindle conveyor x and protrudes from the can body 12 of the empty can a.
The outer sleeve 38, which holds the sleeve in a removable manner, is inserted freely from the tip of the hollow spindle 32 to the outer peripheral flange 34, while holding the inner bottom surface 10a of the can bottom 10 of the empty can a in suction contact. A hollow spindle shaft 32 is located in the center of the receiving surface 40a.
A female threaded portion 38b is formed by carving a bottom receiving pad 40 with a suction port 40b closed so as to face the threaded opening 30a of the suction hole 30 which is connected to the distal end surface on the inner peripheral surface of the inner body of the closed end portion 38a of the sleeve outer body 38. A male screw portion 4 carved on the outer peripheral surface of the flange portion 40c
0d are integrally screwed together in a detachable and replaceable manner.

The hollow spindle shaft 32 has a diameter that gradually decreases in four stages as it moves from the outer peripheral flange portion 34 to the tip;
The inner ring 42a of the roller bearing 42 is externally moated in the second stage 32a, and the retainer tube 44 is installed along the entire length of the third stage 32b.
A is externally screwed, and a flat cap bolt 50 that passes through the suction port 50a along its axis is screwed into the tip screw opening 30a, and the inner ring 48a of the ball bearing 48 is pressed and fixed by the flat head 50b.

The sleeve outer body 38 has an outer circumferential diameter slightly smaller than the inner circumferential diameter of the can body 12 of the empty can a, and an outer ring 42b of a roller bearing 42 is attached to the enlarged step 32a at the base end of the inner circumferential surface 38c. While fixing with the snap ring 52, the outer ring 48b of the ball bearing 48 is placed on the enlarged stepped portion 38e at the tip of the inner circumferential surface 38c, and is fixed on the ring end surface 40d of the bottom bearing pad 40, while the tip sealing portion 38a The inner circumferential surface is formed into a trumpet-shaped taper as it goes toward the tip. The bottom receiving pad 40 has a cylindrical cap shape with a recess 40e containing the flat head 50b of the flat cap bolt 50, and the receiving surface 40a is a suction cup surface that matches the dome-shaped inner bottom surface 10a of the empty can a. In forming the sleeve to be vacuum-sealable and configured to freely rotate integrally with the sleeve outer body 38 relative to the hollow spindle shaft 32,
Printing/Painting When the empty can a is inserted into the sleeve outer chest 38, the sleeve outer chest 38 is inserted into the can bottom 10a radius part 14 of the empty can a.
The open end edge 38f, which has a rounded cross-section, is sunk into the end opening 38a of the sleeve outer body 38 in a position that cannot be attached to the sleeve.

In the figure, reference numeral 30b denotes an attachment port provided at the base end of the suction hole 30, for inserting and attaching a connecting cap to a pipe from a vacuum source (not shown).

Next, a second specific embodiment of the holding spindle of the present invention will be described with reference to FIG. 5.

The empty tube holding spindle E of the present invention includes a hollow spindle shaft 32, a roller bearing 42, and a retaining sheath tube 44.
, interlink 46, ball bearing 48 and snap ring 52
Almost the same elements as in the first embodiment are adopted, and the same members and portions are given the same reference numerals.

The sleeve outer shell 54, which holds the inner circumferential surface 12a of the can 8 and 12 of the empty can a, is inserted freely and freely from the tip of the hollow spindle shaft 32 to the outer peripheral flange 34, and is attached to the bottom of the empty can a. 1
At the center of the receiving surface 56a that holds the inner bottom surface 10a of the suction pad 56, a bottom receiving pad 56 with a closed suction port 56b facing the threaded opening 30a of the suction hole 30 opened in the distal end surface of the hollow spindle shaft 32 is screwed. It is attached to a jaw portion 58b of a flat metal bolt 58 with a barb that passes through a suction port 58a to a shaft D screwed onto the opening 30a so as to be freely rotatable and detachable and replaceable separately from the sleeve outer body 54.

The sleeve outer chest 54 has an outer circumferential diameter similar to that of the empty can A.
The diameter is slightly smaller than the inner circumferential diameter, and the outer ring 42b of the stiffness bearing 42 is fixed to the enlarged stepped portion 54c at the proximal end of the inner circumferential surface 54b with a snap ring 52. The outer ring 48b of the ball bearing 48 is fitted into the stepped portion 54d, and the outer ring 48b is attached to the outer ring 48b of the hollow spindle shaft 32 with a snap ring 60 attached to the inner peripheral surface 54b of the outer sleeve 54.
The inner ring 4 is attached with the snap ring 62 attached to the outer periphery of the step 32c.
8a are respectively fixed, and the inner circumferential surface of the distal end entrance portion 54a is formed into a trumpet-shaped tapered surface whose diameter increases toward the distal end.

The bottom bearing pad 56 has an inner ring 64a mounted on the jaws 58b of a flat bolt 58 with a jaw cap screwed onto the tip of the hollow spindle shaft 32, and the outer ring 64b of the ball bearing 64 is fixed by pressing the inner ring 64a with the flat head 58c. Recessed part 5 that can be attached and detached freely
6c, and the receiving surface 56a is formed into a suction cup surface that matches the dome-shaped recessed inner bottom surface 10a of the empty can a to enable vacuum sealing. In this case, the tip opening edge 54e having a rounded cross section is sunk into the tip opening 54a of the sleeve outer body 54 and attached to the radius portion 14 of the can bottom 10a of the empty can a in a position where it cannot come into contact with the can bottom 10a.

Since the empty can holding spindles D and E of the present invention are constructed as described above, the empty cans a are attached to the sleeve outer bodies 38 and 54 during printing and painting, and the suction hole 30 is inserted through the base end attachment port 30b of the hollow spindle shaft 32. Through ○Kinpei bolts 50, 58 suction ports 50a
, 58a, the inner bottom surface 1 of the can bottom 10 of the empty can a
0a is held by suction pads on the receiving surfaces 40a, 56a of the bottom receiving pads 40, 56, and when seated accurately and stably in the proper position, the tip end edges 38f, 54e of the sleeve outer chests 38, 54
is 0 with respect to the radius portion 14 of the periphery of the inner bottom surface 10a of the empty can a.
．． Since there is no contact between the ends of the can holding spindles D and E, there is no damage or wear due to contact friction between the end closing edges 38f and 54e and the radius portion 14, which occurred frequently in the past.As a result, the gauges at the ends of the empty can holding spindles D and E are eliminated. The function does not deteriorate and the inner bottom surface 10a of the empty can a and the bottom support pads 40, 56 and the support surface 4
00a,. The holding is stable due to surface contact with 56a, and when the empty can a rotates, the sleeve outer bodies 38, 54 and the bottom support pad 4
0 and 56 can easily follow each other and slide against each other to minimize the amount of rotational friction.Especially in the case of the empty can holding spindle E, since the bottom support pad 56 rotates separately from the sleeve outer body 54, the empty can can be easily rotated. Since it has a structure that rotates integrally with the inner bottom surface 10a of the can a, there is almost no scratching on the inner bottom surface 10a and wear of the bottom support pad 56 is eliminated, reducing the number of replacements and improving the operating rate of the printing/painting machine and increasing maintenance costs. The reduction is also large.

Therefore, it is ideal to use a soft material as the material for the bottom receiving pad 56, but a hard material is also acceptable. It goes without saying that the materials, surface treatments, and shapes of the sleeve outer shells 38, 54 and the bottom pads 40, 56 can be selected as desired. Yu By the way, with a conventional holding spindle, it takes 1 to 3 months.
In the present invention, the replacement life of several months has been changed to six months to one year.

This eliminates the problems of printing/coating misalignment and unevenness compared to the conventional method, and it is able to keep up with the high-level printing/coating of 800 to 1,200 cans per minute.

Brief explanation of figures Figures 1 to 3 are central vertical sectional views of main parts of various conventional types of holding spindles equipped with empty two-piece cans, and Figure 4 is the present invention equipped with empty two-piece cans. FIG. 5 is a partial central vertical cross-sectional view showing a second embodiment of the present invention equipped with a two-piece empty can.

○, E... 2. Empty can holding spindle, a... Empty can, 10... Can bottom, 10a... Inner bottom surface, 12... Can body, 12a... Inner peripheral surface, 14 ...radius section, 30...
...Suction hole, 32...Hollow spindle shaft, 38,
54...Sleeve outer body, 38a, 54a...
・Tip entrance part, 38c, 54b...Inner peripheral surface, 38f, 5
4e...Tip Sekiguchi edge, 40,56...
Bottom support pad, 40a, 56a... Seat surface, 40
b. 56b... Suction port.

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A sleeve outer shell into which a hollow spindle shaft is inserted and which is inserted and held in a manner that allows the inner circumferential surface of the body of the cylindrical container to be freely inserted and removed, and a catch that holds the inner bottom surface of the bottom end of the cylindrical container in suction contact with the inner surface of the cylindrical container. A holding spindle for a cylindrical container in printing and painting, comprising a bottom support pad with a suction port opened in the center of the surface, which is rotatably attached to the hollow spindle shaft. 2. A holding spindle for a cylindrical container in printing and painting according to claim 1, wherein the sleeve outer body is formed such that the tip thereof cannot come into contact with the inner bottom surface periphery of the bottom end of the cylindrical container when the cylindrical container is inserted. . 3. The printing/painting according to claim 1 or 2, wherein the bottom receiving pad is attached to the spindle shaft as an integral part of the sleeve outer shell in a detachable and replaceable manner within the tip opening of the sleeve outer shell. Holding spindle of cylindrical container in. 4. The bottom support pad is attached to the tip of a hollow spindle shaft protruding into the tip opening of the sleeve outer shell so that it can freely rotate as a separate body from the sleeve outer shell. Holding spindle for cylindrical containers in printing and painting as described.