FIELD ON INVENTION:
The present invention relates to an apparatus and method for verification of diametric variations of a cylindrical object. More specifically the invention relates to an apparatus and method for verification of roll roundness of rolls of paper used in newspaper, packaging industries.
BACKGROUND OF THE INVENTION:
The printing of newspaper, magazine involves multiple printing processes in which rolls of papers are processed at high speeds. Any significant diametric deviation of rolls will eventually cause problems in the printing process. The packaging process involves high pressure and any diametric variations or deterioration may disturb the packaging process.
The rolls of paper or packaging material manufactured and transported to the site of printing get distorted or deformed due to handling at transit, storage and at the printing or packaging area. Such handling may result in deformation of the roll. The deformed rolls are no longer round as when it was wound. A method for verification of diametric variations can alert the operator to potential problems prior to printing or packaging process.
In printing or packaging industry where low strength raw materials are used i.e. paper etc. the diametric variations or deformity of roll may create hurdle in printing or packaging.
There are known certain assemblies / system that measure the diametric variations in a roll. However there is no simple and cost effective apparatus and method available for
measurement of diametric variations that can be applied uniformly to printing and packaging processes.
US Patent Application No. 2003/0177850 pertains to a system and method for verifying roll roundness, wherein the roll rotator is configured with a plurality of sensors which are activated when a roll of paper is lifted and rotated by roll rotator. The roll of paper is rotated an entire revolution and a plurality of distance measurements are taken at each sensor. As the readings are taken, a filter algorithm may be applied to remove values that are too far out of range, such as values which are representative of a torn wrapper or other defects in the covering surface of the roll. Once the readings have been taken, an average of the readings is calculated and the roundness algorithm compares each reading with the average for each of the sensors. The difference between each reading and the average are summed and squared and the standard deviation is calculated from the square root of that value. If the standard deviation is greater than a predetermined value the roll fails the roundness test. The predetermined value is dependent on a number of factors, including hardware tolerances, and can be altered for different requirements. In case of failure, the roll of paper is set aside in a designated reject area for further analysis. Rolls that pass the roll roundness test are sent on for use in the newspaper printing press.
The limitation of the above invention is that a complete system is required for data analysis and can only be operated by some trained person. The cost of the system is quite high as well.
Therefore there is a need of simple and economical system which can be applied in all small and big industries uniformly and can be performed by even a non trained person.
SUMMARY OF THE INVENTION
The present invention is directed to an apparatus and method for measurement of diametric variations of cylindrical object. More particularly the invention relates to rolls of paper or rolls of packaging material.
In accordance with an embodiment of the invention there is provided an apparatus for measurement of diametric variations of a cylindrical object, said apparatus comprising:
- A roll rotator; and
- A measuring assembly
- A roller
According to another embodiment of the invention there is provided an apparatus for measurement of diametric variations of a cylindrical object, said apparatus comprising a roll rotator configured with a plurality of measuring assemblies fixed on longitudinal axis of the roll rotator.
According to yet another embodiment of the invention the measuring assembly of the apparatus for measurement of unevenness or wobbling of cylindrical object may work independently or may be integrated with printing process or packaging process.
In accordance with another embodiment of the invention the roll rotator comprises of: A driving motor means
- A drive roller
- A driven sprocket mean
- A drive sprocket mean, and;
- A driving chain or other suitable driving means
According to yet another embodiment of the invention the cylindrical object placed on the drive roller (12) and roller, the drive roller (12) is coupled with driven sprocket (14), wherein the driven sprocket is attached with drive sprocket (15) by means of roller chain (16)or other suitable means.
In accordance with another embodiment of the invention the measuring assembly comprises:
- A reel follower
- A measuring scale
- A pointers
- A reel follower spindle, and;
- A spindle follower guide mean
According to yet another embodiment of the invention the reel follower (21) is placed on cylindrical object, reel follower attached to spindle guide mean (24) so that reel follower attain a confirm position and move freely at its axis. The reel follower spindle is also coupled with metric scale 26, two pointers 22 are loosely encompass the reel follower spindle which can be moved upward and downward direction alongwith the movement of reel spindle follower. The spindle follower guide assembly 25 is coupled with the reel follower spindle for guiding reel follower spindle in upward or downward direction. The reel follower is guided in spindle follower assembly by a means of spindle guide screw 24.
In accordance with an embodiment of the invention in the apparatus, the roll rotator is activated by energy means.
According to yet another embodiment of the invention the measuring assembly is engaged onto a horizontal bar and further the measuring assembly can be displaced to any desired suitable position roll by sliding it on horizontal bar further.
In accordance with yet another embodiment of the invention there is provided a method for measurement of diametric variations in cylindrical object comprising
- placing the cylindrical object between the roll rotator and roller
- placing the measuring assembly on cylindrical object
- activation of roll rotator by energy means
- measurement of diametric variations on scale fixed on measuring assembly
According to yet another embodiment of the invention there is provided a method for measurement of diametric variations by placing the cylindrical object between the roll rotator and roller. The roll rotator is driven by driving motor means which is activated by a suitable energy means. Roll rotator which is coupled with driving motor means with a suitable driving means. Upon activation of driving motor means the roll rotator start moving on its axis. The cylindrical object which is placed between roll rotator and roller will start moving accordingly in opposite direction. The reading at the measuring scale fixed at zero and put the reel follower upon moving cylindrical object. The reel follower start moving and on any deformity it gives a reading on scale by way of second pointer. The cylindrical object is rotated at least an entire revolution and a plurality of distance measurements are taken on the measuring scale by reading travelled by pointer vertically.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1: is a detailed mechanism of roll rotator according to the present invention.
Fig.2: is measuring assembly for measurement of diametric variations of cylindrical object.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawing in detail, wherein like numerals indicate corresponding elements throughout the views, Fig. 1 illustrates a roll rotator. A drive roller 12 is shown
on which a cylindrical object is placed between a drive roller and roller. The drive roller 12 is coupled with a driven sprocket 14. The driven sprocket controls the speed of roller. The drive sprocket (15) attached to driven sprocket by a suitable mean like roller chain or other suitable driving means.
Fig 2 illustrates a view of measuring assembly, wherein the reel follower 21 is to a reel follower spindle such that the reel follower attains a confirm position and is allowed to move freely at its longitudinal axis. The reel follower spindle is coupled with a measuring scale 26. The two pointers 22 loosely encompass the reel follower spindle such that they can be moved in an upward and downward direction alongwith the movement of reel follower spindle. The spindle follower guide assembly 25 is coupled with the reel follower spindle for guiding the movement of reel follower spindle in upward or downward direction. The reel follower spindle is guided in spindle follower assembly by a means of spindle guide screw 24.

claim:
1. An apparatus for measurement of diametric variations of cylindrical object comprising at least one roll rotator and at least one measuring assembly.
2. The apparatus as claimed in claim 1 wherein said apparatus comprises a roll rotator, a measuring assembly and a roller.
3. The apparatus as claimed in claim 1 and 2 wherein roll rotator configured with a plurality of measuring assemblies fixed on longitudinal axis of the roll rotator.
4. An apparatus as claimed in claim 1 wherein the roll rotator comprises:

- A driving motor means (11)
- A drive rollers (12)
- A driven sprocket mean (14)
- A drive sprocket means (15) and;
- A driving chain or other driving means (16).

5. An apparatus as claimed in claim 1 to 4 wherein cylindrical object placed on the drive roller (12) and roller, the drive roller (12) is coupled with driven sprocket (14), wherein the driven sprocket is attached with drive sprocket (15) by means of roller chain (16)or other suitable means.
6. An apparatus as claimed in claims 1 and 2 wherein the roll rotator is activated by energy means or manually operated.
7. An apparatus as claimed in claims 1 to 6 wherein the measuring assembly can be displaced to another position of the cylindrical object.

8. An apparatus as claimed in claims 1 to 7 wherein measuring assembly comprises:
- A reel follower (21)
- A measuring scale (26)
- A pointer (22)
- A reel follower spindle (23) and;
- A spindle guide means (24).

7. An apparatus as claimed in claim 1 and 6 wherein the reel follower (21) is placed on cylindrical object, reel follower attached to spindle guide mean (24) so that reel follower attain a confirm position and move freely at its axis. The reel follower spindle is also coupled with metric scale 26, two pointers 22 are loosely encompass the reel follower spindle which can be moved upward and downward direction alongwith the movement of reel spindle follower. The spindle follower guide assembly 25 is coupled with the reel follower spindle for guiding reel follower spindle in upward or downward direction. The reel follower is guided in spindle follower assembly by a means of spindle guide screw 24.
8. The apparatus as claimed in claim 1 wherein the said apparatus may work independently or may be integrated with printing process or packaging process.
9. According to yet another embodiment of the invention there is provided a method for measurement of diametric variations by placing the cylindrical object between the roll rotator and roller. The roll rotator is driven by driving motor means which is activated by a suitable energy means. Roll rotator which is coupled with driving motor means with a suitable driving means. Upon activation of driving motor means the roll rotator start moving on its axis. The cylindrical object which is placed between roll rotator and roller will start moving accordingly in opposite direction. The reading at the measuring scale fixed at zero and put the reel follower upon moving cylindrical object. The reel follower

start moving and on any deformity it gives a reading on scale by way of second pointer. The cylindrical object is rotated at least an entire revolution and a plurality of distance measurements are taken on the measuring scale by reading travelled by pointer vertically.