|Publication number||US2704530 A|
|Publication date||Mar 22, 1955|
|Filing date||Jun 12, 1952|
|Publication number||US 2704530 A, US 2704530A, US-A-2704530, US2704530 A, US2704530A|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (17), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Mamh 1955 K. A. NILSEN ETAL 2,704,530
MACHINE FOR THE APPLICATION OF SURFACE COATINGS ON STRIPS Filed June 12, 1952 United States Patent MACHINE FOR THE APPLICATION OF SURFACE COATINGS ON STRIPS Knut Anders Nilsen and Johan Wleiigel, Oslo, Norway, assignors to A/S Nordisk Aluminiumindustri, Oslo, Norway Application June 12, 1952, Serial No. 293,187
Claims priority, application Sweden June 19, 1951 2 Claims. (Cl. 118-224) In the surface treatment of strips of metal or other material, the treatment may be performed in steps, each step forming a separate operation. It is convenient to make the strip or strips pass the various treatment steps continuously and to adjust theconditions of each individual step in such a manner that the material which continuously leaves the apparatus has a surface coating of uniform and satisfactory characteristics.
A very important link in such a continuous treatment process is formed by the machine applying the surface coating. Any fault or imperfection in the functioning of this machine, for instance causing the machine to stop, might involve an incorrect step in the other treatment steps and thereby damage the characteristics of the strip material and of the coating; any stoppage also meaning a production loss.
Previous constructions of machines adapted for the application of surface coatings on continuously running strips have been of limited utility for this special purpose. Thus, during the application of a lacquer coating, it has been necessary, in order to avoid faulty spots in the same, to stop the machine and thereby the continuous process, in order to replace the application rollers by the often occurring faults in the sensitive rubber or gelatinous surfaces of the same. Further, it has also, for instance, been impossible to apply one lacquer coatingon top of another in one machine.
The present invention relates to a machine adapted to effect the application of a surface coating to continuously running strips by means of application rollers, whereby stoppages in the application of the coating are avoided even by the replacement of an application roller. The application is only interrupted for a very short length of the strip, viz. on both sides of a strip joint.
According to the invention, this is achieved by providing the machine with two application systems which may operate completely independently but are driven in synchronism, and which may be used separately or operate in conjunction for the consecutive application of similar or varied (complex) coatings. Thus, the machine may for instance be adapted for the immediately consecutive applications of two similar lacquer films, of different thickness, in such a manner that the film last applied covers possible deficiences or pin holes etc. in the underlying film. As the application systems are so made that they may operate completely independent, it is for instance also possible to apply two inequal lacquers which in combination give more favourable results than is obtainable with two lacquer qualities used separately.
A machine according to the invention is made in such a manner that one complete application system or parts of the same may be rendered effective without stopping the machine or the application process. The application of the coating is in the meantime effected by means of the remaining application system only. Further, each individual roller of the two application systems is so mounted that the distance between the individual rollers may be varied without varying the distance between the same rollers and the remaining rollers of thelsystem, which fact also involves the great advantage that the adjustment of the thickness of the coating may be effected much more easily than in any other known machines.
Thus, any roller in the application system may be re e the direction of the arrow through the machine.
placed independently of the remaining rollers or the driving means of the same.
Finally, a machine according to the invention is characterised in that the two rollers between which the strip is passing, the application and counterpressure rollers, may temporarily be set apart for instance when the strip joints are passing the rollers. The construction of the machine enables the raising and lowering, respectively of the rollers, separately or together, perpendicularly to the strips, independently of each other and without influencing the adjustment of the remaining rollers of the application systems. In the embodiment of the machine now to be described with reference to the accompanying drawings, the counterpressure rollers are, for practical reasons, so mounted that their position relative to the corresponding application rollers is controlled by at least one eccentric which by external influence may be caused to make one revolution and thereby temporarily move each individual counterpressure roller relatively to the corresponding application roller, the distance between the individual roller pairs being unchanged after one revolution of the eccentric.
It has been found especially convenient to enable the rollers to be automatically moveable relatively to each other when an inequality is to pass. According to the present invention, this is obtained so that the eccentric movements are automatically controlled by a feeler which effects the eccentric motions when the inequalities are to pass the rollers. In order to make the portion of the strip length which is then without coating as short as possible, the machine is so made that the two counterpressure rollers are displaced with a relative time delay corresponding to the travelling speed of the strip. Thus, the two eccentric means may be interconnected in any suitable manner in order to achieve the desired result, but it is found convenient to arrange the means to be driven from separate shafts.
As stated, the eccentric means may also be arranged in conjunction with the application rollers proper, but in the embodiment shown it has been found suitable to move the counterpressure rollers automatically while the movement of the application rollers proper, in case the automatic means of any reason might fail, may be manually controlled by means of suitably arranged raising handles.
The invention is now to be more closely described under reference to the accompanying schematic drawing, which illustrates one embodiment of the machine. It will be appreciated that the drawing only shows such parts of the machine which are considered essential for the understanding of the invention, while other parts which might be required for the operation of the machine are deleted, partly because the same may be made and arranged in many different ways and partly in order not to make the drawing obscure.
Obviously the present invention is also advantageously applicable to machines adapted to perform a double-sided lacquering of the strips.
In the drawing,
h Figure 1 is a longitudinal schematic view of the mac me.
Figure 2 is a partial sectional view taken along the line A--A of Figure 1.
In the drawing, 1 is the strip which is to be coated and which is presumed to be continuously runningnin e machine is provided with two coating application systems which in their entirety are designated I and II and which may be completely similar and for the purpose of simplicity, the same reference characters are used for systems I and II.
In the embodiment shown, each application system comprises a trough 2 containing the coating substance and wherein a rotating roller 3 is partly immersed. From the said roller 3 the coating substance is transferred to one or more transfer rollers 4 and thence to the application roller proper 5, which transfers the coating substance to the strip 1 when the latter is pressed against the roller 5 by means of a counterpressure roller 6. The adjustment of the quantity of coating substance transferred from the trough 2 and thereby the thickness of the film applied to the strip 1 is effected by adjustment of the various rollers relatively to each other, viz. according to the invention by individual adjustment of the various rollers without thereby necessitating any adjustment of the other rollers. The machine according to the invention is adapted for the displacement of the various rollers by means of any suitable means, such as screw spindles. For the sake of convenience the displacement means referred to are indicated in the drawing by dot-and-dash lines only, viz. the line 3a corresponding to the roller 3, the line 4a for the roller 4 and the line 5a for the roller 5.
In addition to the said adjustment means, provisions are, as stated, made for the automatic and temporary removal of the counterpressure roller 6 from the application roller 5 in order to pass possible thickenings, such as joints appearing between the individual strip lengths.
For this purpose, each of the counterpressure rollers 6 is at each end mounted in a vertical sliding bearing 7 which by means of a rod 8 is connected to an eccentric 9 mounted on a shaft 10 or 11, respectively, so that each of the rollers 6 may perform a reciprocal vertical movement relatively to the corresponding application roller 5 during one revolution of the shaft 10 or 11, respectively. The shafts 10 and 11 are normally not rotating, but are caused to make one revolution with the correct relative time interval when a thickening appears in the strip 1 being fed through the machine. The means used for this purpose comprises, in the embodiment shown in the drawing, a raising magnet 12 which is actuated in any suitable manner, for instance by means of a feeler (not shown), the position of which depends upon the thickness of the strip 1. When the raising magnet 12 is actuated a shaft 13 makes a part of a revolution so that the tongues 14 and 15 are moved and release corresponding blocking projections 16 and 17 on clutches 18 and 19, respectively. The clutch 19 is then caused to engage a permanently rotating idle pinion 20, whereby the shaft 21 carrying the fixed pinion 22 is rotated. The pinion 22 is in engagement with idle pinions 23 and 24 and by the release of the blocking projection 16 the clutch 18 and thereby the shaft 10 and the eccentric 9 are rotated, whereby the counterpressure roller 6 of application system I is moved downwardly as described above. The pinion 22, previously referred to is provided with a catch 25 which, when moved through a certain arc hits the release hook 26 and carries the same away from the blocking projection 27 thereby causing the clutch 28 to engage the idle pinion 24, so that the shaft 11 and the said eccentric 9 are caused to rotate whereby the counterpressure roller 6 of application system II is moved away from the corresponding application roller 5 as described above. The release tongues 14, 15 and 26 are returned to their initial positions before each of the clutches 18, 19 and 28 has made one revolution, with the end that the motions are interrupted when each of the shafts 10, 11 and 21 has made exactly one revolution. The arc to be passed by the catch 25 before the same acts upon the blocking projection 26, is so adjusted relatively to the travelling speed of the strip 1 that a joint which has been passed by application system I will just be arriving at application system II, whereby not only both application rollers are protected against damage, but the length of the strip 1 which does not receive any coating is made of the shortest length possible.
In addition to the possibility of lowering the counterpressure rollers, provisions may be made for instantaneous raising of the application rollers proper along the line 5a by a suitable external influence in case some unequality is observed which might damage the rollers.
The operation of the machine and the various gears for the provision of the correct relationship between the speeds of the various rollers, as well as the arrangement of pumps for the coating substance to the troughs 2 obviously may be made in any suitable manner, it being considered unnecessary to the understanding of the present invention to enter into details in this connection.
1. A machine for the application of a continuous coating upon the surface of a strip and particularly a continuously moving strip of metal and the like comprising two independently operable coating applying assemblies arranged in predetermined relation to the strip with the assemblies being arranged in immediate succession with respect to each other relative to the path of movement of the strip, each applying assembly including a rotatable roller, a rotatable counter-roller of the pressure type urging the strip against the roller, means to apply coating material to the roller, a journal for the counterroller, guide means supporting the journal for movement toward and away from the strip, eccentric means, a shaft member on which the eccentric means is rotatably mounted, means interconnecting said eccentric means and the journal of the counter-roller, drive means to effect a single rotation of the shaft member, and control means to actuate the said drive means.
2. A machine as defined in and claimed by claim 1 further characterized in that delay means is connected between each eccentric means whereby after the operation of one eccentric means, a predetermined time delay occurs before the operation of the other eccentric means.
References Cited in the file of this patent UNITED STATES PATENTS 1,375,126 Willwerschield Apr. 19, 1921 1,663,232 Ambler Mar. 20, 1928 2,246,126 Davies June 17, 1941 2,573,097 Epstein Oct. 30, 1951 2,614,522 Snyder Oct. 21, 1952 2,651,283 Zinn Sept. 8, 1953
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|US7798191||May 7, 2008||Sep 21, 2010||Silverbrook Research Pty Ltd||Printing arrangement having a page binding support tray|
|US20030082029 *||Dec 4, 2002||May 1, 2003||Kia Silverbrook||Stack pressing apparatus with integral glue dispenser|
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|US20070107847 *||Jan 8, 2007||May 17, 2007||Silverbrook Research Pty Ltd||Printing arrangement with an adhesive application station|
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|U.S. Classification||118/224, 118/708, 118/253, 118/247, 118/255|
|International Classification||C23C2/00, C23C2/40, C23C2/36|
|Cooperative Classification||C23C2/40, C23C2/006|
|European Classification||C23C2/00D, C23C2/40|