IT8120914A1 - Device for detecting the angular position of a cylindrical container, lithographed externally and welded along a generatrix - Google Patents

Description

Description of the patent for an industrial invention.] >having._title:

"Device for detecting the angular position of a cylindrical drum, lithographed externally and shown along a generator" __ ^ _[ i

SUMMARY

._ A device is described, functionally af~^ i

reliable and constructively simple,..to detect J__

; The angular position of a cylindrical container, lithographed on the outside and welded along a generator, I

je placed in rotation around its axis by means of motor. i i !tor, on a welding machine on the can

I

of studs in an angular phase predetermined by lithography. This device comprises two brushes having active ends aligned parallel to said axis, a support arm to keep said brushes in contact with said bin, as well as an electrical circuit leading to said brushes, intended to be closed by means of the welded generator, to deactivate said motor means.

_ . .... DESCRIPTION

_ _ .The present invention relates to a device

.positive..to detect the angular position of a bin.

cylindrical, .lithographed externally and welded lengthwise

a generator, placed in rotation around its axis by a motor, on a welding machine

.ra_ on the bin_of studs in predetermined angular phase I

with JLithographyL._ j ? As is known, the bins of the specified type are 1 i i . . ! > conventionally equipped with studs, which !jare applied by electric welding at two diametrically opposed points.;j * j and in which a certain

, niera the handle for lifting and carrying '

| of the bin itself.]

i ! . T?'li bins have a cylindrical shell made up of-1

I to a metal sheet on which are reported!

| you through lithography suitable configurations and writings

| to indicate the nature and manufacturer of the product

i contained in it. ? ! _ ;

Well in the manufacture of such bins there is. \ :

! ;the need for studs to be applied to the bin

'ne itself in a fixed angular phase with respect to '

\ * yellow to the configurations and writings that the bin itself contains. . "

] is displayed externally. In fact, for functional and aesthetic reasons, it is required that when the bin is handled by the handle, the writing be displayed frontally.

To meet the above requirement, a device of the specified type is currently used. Its operation is based on the use of a magnetic detector that defines an air gap through which the side wall of the bin passes during the rotation of the bin itself. When the welded generator of the bin reaches the air gap, the presence of the two overlapping sheet metal edges at the weld causes a variation in the magnetic field. Due to this variation, the detector emits a signal, which is used to stop the rotation of the bin.

This known device, while generally satisfying the aforementioned need, has some disadvantages that limit its use. In particular, it has a po-| jI operation.

|co reliable. In fact it does not emit the expected se-Ii. ' '

signal only when its air gap intercepts the overlapping edges of the side wall of the bin, the

sometimes even when the studs on the bin are being electrically welded nearby. In such circumstances, evidently some bi-

-3-

%

gifts are angularly stopped in a position different from the desired one, resulting in excessive production waste. .. __ _ ... ..

A further drawback of the device is known to be that sometimes the magnetic detector does not emit a signal when the welded generator passes through its air gap. This occurs in all cases where the edges overlap for a short distance. In this case, the drum continues to operate indefinitely until the operator intervenes.

__ The problem underlying the present invention is that of devising a device of the type specified which has structural and functional characteristics such as to satisfy the above-mentioned requirement, while simultaneously overcoming the drawbacks cited with reference to the prior art.

,i._ This problem is solved by a device of the specified type which is characterized by the fact i

jcomprising two brushes having active ends aligned parallel to said axis and a supporting arm | " ' ' "

:to keep said brushes in contact with said _ !_bin, as well as? an electrical circuit connected to 1"

_ These brushes, intended to be closed through t ~

!the welded generator.

I_ Further features and advantages of the device according to the present invention will be

from the description below of one of his rea

preferred location given as an indication and not

limiting, with reference to the attached figures, in ?

j

which : ;

. !

- Figure 1 represents a perspective view

of a machine for welding studs on a bi? . _ i

1

done, incorporating a device according to this

invention, 1j

j - figure 2 schematically represents a !

?jparticular:of the device in figure 1, and ?[~

? '

j - Figures 3 to 7 schematically represent

?jsuccessive stages of the manufacture of a bin at.t?ua

T~ ?

Jta using the machine in figure 1. i

! With reference to the attached figures, with 1 ? glOj-_

! :

jbally indicated a machine for welding b?r

I I

_ic.hie 2 on?-.a-cylinder bin.co_3, formed by.a viroj-

jla 4, which is lithographed externally with a liL

I

jtography 5 and is welded along a generatrix 6. j

j

In particular, bin 3 is of the type manufactured'

^starting from a sheet 7, which is lithographed on*

! """ ~~ i ! . . i

rune face with lithography 5 for the entire surface!

! ? . ' .1

facial folds with the exception of two lateral flaps;.

: i

18 and 9 (see figure 3). The sheet metal 7 I rolled with!

formation of the ferrule 4 which is welded along the

the -5- !

!

?

generator_6^iji_correspondence_of the two edges 8 and 9

superimposed (see figure 4). At ferrule 4? then

conventionally applied a bottom. The bin so?

obtained by rotating around its X-X axis (ve-

(see figure 5). When the bin has reached a pre- __

fixed desired angular position, its rotation

is stopped (see figure 6). Maintaining the bi-T

done in this angular position, they are firmly fixed to the bin^j-

the studs 2 (see figure 7). J.

Machine 1 (see figure 1) comprises a unit?

|

idi positioningly.-..10, .a welding unit ll.,_..not?-

Iich?. a conveyor 12, interposed between said units? jI

the 1

!10 and 11. _

' _ The positioning unit 10 comprises a plate-!

Jforma 13 of X-X axis which is rotatably mounted?

i !I

the edge of a load-bearing structure 14 and is dragged!

! :

Without rotation around its axis by means of a 15J motor.

??On.the.platform?a.~:13.?,.coaxialm:ent' f "iss "ato a bidTo1- '

Iijne 3?.The positioning unit 10 includes ulteri.o!ir-'

imente a device 16 to detect the position an? I

bin 3. ;

; ?|

j . ..The device 16 comprises two brushes 17 and 18;

mounted in a guided and elastically yielding way

i !

(edge of a brush head 19. The brushes 17:

|

ie _1JL.have..active ends 17a.and 18a aligned, parallel

;a11? X-X axis._Yantaggiosamente_in correspondence ?

of these active ends 17a and 18a the brushes 17 e_ are equipped with wheels 17b and 18b.

Reference 20 indicates a support arm having one end 20a fixed to the supporting structure 14, while the brush head 19 is fixed to the other end 20b. The support arm 20 maintains the brush head 19 in a predetermined relationship with the bin so that the ends 17a and 18a of the brushes 17 and 18 are in contact with the bin itself.

An electrical circuit, globally indicated by 21, leads to the brushes 17 and 18. This circuit is normally open at the said brushes and is intended to be closed through the welded generator 5 when this comes into contact with the brushes.

!zole _17__and 18 themselves in this way? the desired'' is obtained. ? r. .. 1 detection of the angular position of the bin. The ^closure _of the __electric circuit 21 is used |to deactivate __the said motor means 15, with consequent stopping of the rotation of the _platform 13. In particular the electric circuit 21 comprises a transformer 22 having a primary connected to an electric network and a secondary connected with the cables 23 and 24 to the brushes 17 and 18 respectively, as well as a telp

. - - - ? ? ? - ?

2S circuit breaker with coil inserted on the cable?24 and counted

1_^_Device for detecting the angular position of a cylindrical bin, lithographed externally I

|and_welded along a generator and rotated around its axis by means of a motor,__on a machine for welding studs on the can in an angular phase predetermined with lithography, characterized by the fact that it comprises two brushes having ends

Claims (3)

active, aligned parallel to said axis, a support arm to keep said brushes in contact with said bin, as well as an electrical circuit connected to said brushes, intended to be closed through the welded generator, to deactivate said motor means. 2. Device according to claim 1, characterized in that said brushes have active ends equipped with wheels. j . ? l ! 3. Device according to the preceding claims and as described and illustrated in the attached drawings for the specified purposes. 1