Patent Application
20050247017
The present invention refers to a device for positioning and assembling successive frames, constituting a production line machine, wherein the device is used in particular for the relative positioning of two adjacent frames.
Such machines comprised of several successive frames are commonly used in the fields of the packaging and printing industries, in particular for cardboard box converting and manufacturing. One will however note that many production lines related to quite different technical fields also require machines comprised of a plurality of units assembled and arranged one after another. These units can be stations in which various successive operations are carried out, relating to production, modification or conditioning of a product from its upstream infeed to its downstream delivery.
In order to describe in a practical manner the problem intended to be solved by the present invention, a rotary printing machine comprising several printing units will be taken as an example of a production machine. Color printing of a cardboard sheet or a web material can be achieved from a printing line including at least three or four printing units. Each unit deposits a primary color, namely the yellow, cyan and magenta for a three-color printing.
Superimposing the colors enables, through many schemes and intensities, obtaining all natural tints. However, in order to obtain adequate quality printing, it is necessary to reach a perfect superimposition of the successive prints printed by each printing unit. In order to reach that goal in the near future, one main objective consists in positioning the frames of each unit to be related to another, in order to obtain, for example, as perfect alignment as possible.
Such frames are usually equipped with four feet, wherein each foot is arranged at a base plate angle. The feet are each mounted on a threaded rod so that the feet can be adjusted in their height independently of one another. Such a system makes it possible to make the traveling plane of the sheet or the web material through the printing group entirely horizontal, when compensating, if necessary, surface evenness faults on which the printing unit lays.
The individual printing units are methodically positioned in line, starting from the last one. That positioning aims to achieve for each printing unit a traveling plane perfectly horizontal and aligned with respect to the traveling planes of the adjacent upstream and downstream units. To perform the method, one uses a tended wire between one end and the other end of the production line, to serve as a linear reference for the lateral and angular alignment of the different frames as well as for a horizontal reference line. One also uses an air level, a compass equipped with a comparator as well as space bars.
Alignment operations are as follows: one will first of all arrange the last frame parallel to the wire, at a certain distance from the wire. One will set the transverse level of the frame by means of an air level arranged on an anvil roller of the printing unit. One will then set the longitudinal level of each frame side. The perpendicularity of the frame with respect to the tended wire will be set by means of the compass and the comparator. To perform the method, the one end compass is fastened at the bottom of the frame into a bore with tight tolerance and which is provided upstream of the printing unit. A comparator arranged at the second end enables reading a value related to the surface, which value will then be compared to a second value measured after a half-turn swiveling of the compass. The differences registered on the comparator will be corrected using screws at the frame feet. After successive stages, one should reach a perfect perpendicularity of the printing unit.
It is then advisable to settle the adjacent printing unit frame parallel to the tended wire, at the same distance from the wire as previously. The second printing unit will be set according to the previous one that has been just set up. For that purpose, one will use a precision ruler provided with a level that will be longitudinally laid on against the anvil rollers of both printing units. This operation will allow setting of the height of the second printing unit as compared to the previous one. It will be advisable to also set the space between both printing units, which space must be precise and constant for all units. This operation requires using reference space bars.
Once the settings of the second printing unit are achieved, it is still advisable to check the perpendicularity of the second unit with respect to the horizontality of the tended wire. That control is achieved using the compass and the comparator, as before. If the result should not be satisfactory, it would then be advisable to remove the space bars and correct the perpendicularity error. The levels will then have to be rechecked.
After these operations, it will still be necessary to also deal with all other printing units. With four-color processes and/or printings using special inks, such as silver or gold, it would be necessary to position not less than four, five or six printing units. The positioning of other frames supporting stations needed for the functioning of such a printing line is also to be taken into account. Among those stations, one will include as examples the infeed station, the various intercalary drying stations, the delivery station, etc. . . . Moreover, it may happen that a production line intended for printing is directly followed by a line for converting the printed material. One realizes that such machines or machine embodiments can include a huge amount of stations for which each frame must be accurately positioned with respect to the others.
The time required for such a frame alignment is the main drawback of current methods. The duration delays the putting the production line into operation and also increases the machines installation cost.
The object of the present invention is to avoid the above drawbacks by proposing a device enabling simplifying the positioning of the successive frames constituting a machine before its assembly. Moreover, the device should be simple to realize to obtain the benefit of a low cost price and to lower as much as possible the global cost involved in the installation of such a machine. The object of the invention should also be implemented without requiring subsequent changes of the frame positioning. Lastly, the device of the invention should not be limited to the positioning and assembly of frames according only to a rectilinear alignment, but should also be entirely satisfactory when installing a curved production line, for example, at right angle.
These aims are achieved owing to the present invention which is a device for positioning and assembling successive frames, in particular for positioning frames constituting a production line of a production machine, according to the invention. The device is intended in particular for relative positioning of two adjacent frames, namely an upstream frame and a downstream frame. At least one link connects the upstream frame to the downstream frame and supports the upstream part of the downstream frame. The link comprises a cylinder that extends across the successive frames, and the cylinder is received in a bearing at each of the adjacent frames. A tightenable tension rod locks the selected relative positions of the successive frames.
Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.
The invention will be more clearly understood from a preferred embodiment in a non-limitative example and illustrated by the accompanying drawings, in which:
According to
The device 10 comprises one link 11 connecting the upstream frame 2a to the downstream frame 2b. The link 11 is arranged in the downstream part 20b of the upstream frame 2a and supports the upstream part 20a of the downstream frame 2b. The link preferably comprises a cylinder 12, which extends across direction 3, and is fixedly attached into bearings 13 disposed above and below the cylinder. The bearings 13 are advantageously located at both ends of the cylinder 12. However, it is also possible to add one or several intermediate bearings intended to jointly support the weight of the cylinder 12 as well as the weight of the upstream part 20a of the downstream frame 2b. According to another embodiment, it could also be possible to provide a continuous support against the whole length of the cylinder.
The link 11 is preferably arranged on the bisectrix of an angle issued from two adjacent frames 2, namely the horizontal angle formed by the upstream frame 2a and the downstream frame 2b.
The frames 2 are usually rectilinearly positioned, so that the link is here perpendicularly arranged with respect to the alignment. It can however happen that frames 2 of machine 1 are not all aligned according only to a main longitudinal axis, but are curved at right angles, for example. Such an installation will essentially depend on the arrangement possibilities provided by machine 1 as well as on the available space for its installation.
In another realization, it could be possible to arrange for several links 11, for example one on each side of frames 2. Those links could thus be spherically shaped, like a swivel, rather than being cylindrically shaped.
The detail of one base support 15 used for supporting the frames 2 is shown in
Referring to
The device 10 of the present invention advantageously enables each frame 2, except the first one, to be mounted on two supports 15, namely in its downstream part 20b and on a link 11 in its upstream part 20a. Only the first frame of
The invention enables the leveling of the downstream frame, through the setting of the supports 15 of its downstream part 20b, when one has to position that frame with respect to the previous upstream frame 2a. The link 11 enables the downstream frame 2b to be freely moved with only one degree of motion, i.e. for swivelling in a vertical plane around the link 11 located in its upstream part 20a. Any angular swivelling in a horizontal plane is thus impossible because the cylinder 12 is fixedly attached to bearings 13. Once the leveling is completed, one will have to maintain the constant level by locking each of the upstream 2a and downstream 2b frame positions. Locking of the frames 2a and 2b is achieved by means of a tension rod 21. The tension rod 21 crosses the upstream part 20a of the downstream frame 2b as well as the cylinder 12 and is screwed into the downstream part 20b of the upstream frame 2a. The complete tightening of the tension rod 21 will enable fixedly attaching the two frames 2a and 2b and maintaining their previous leveling. An air level is the only additional tool to be used for achieving setting of the supports 15. It should thus be envisaged to add such a tool to the frames, i.e. relatively positioned.
Aligning and leveling the downstream frame 2b is thus much easier. Indeed, to perform those operations, a reference line, materialized for example by a tended wire, is not required. It is also not necessary anymore to use either a compass or a comparator. Moreover, spacing bars, previously used for spacing two adjacent frames, are thus advantageously an accessory rendered useless for perfectly achieving a correct positioning.
Lastly, a device 10 provided within a frame 2 is also advantageously not to be considered as an expansive installation regarding saving time at the time of machine 1 installation.
Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 00685/04 | Apr 2004 | CH | national |
