Plate roll loading and positioning apparatus and method

Information

  • Patent Grant
  • 6796238
  • Patent Number
    6,796,238
  • Date Filed
    Monday, September 9, 2002
    22 years ago
  • Date Issued
    Tuesday, September 28, 2004
    20 years ago
Abstract
The invention relates an automated adjusting arm assembly for conveniently and quickly loading printing press cylinders into a printing press such that proper initial ink and impression settings result without operator adjustment. The assembly includes two stationary plates and movable plates connected to the stationary plates by a plurality of wheels. The movable plates in conjunction with a catch or a capture knob assembly thereon are adapted to lower a printing press roll onto an anilox and/or an impression roll in the printing press.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The present invention relates to the field of printing presses. More particularly, the invention relates to a convenient method for quickly loading printing cylinders into a printing press.




2. Description of the Related Art




Previously, to install a printing press cylinder (“plate roll”) in a printing press, an operator would align the cylinder bearings with holes in press adjusting arms and simultaneously skewer a shaft through the holes and the cylinder therebetween. After skewering the cylinder, the operator had to adjust the press adjusting arms to achieve desired ink and impression settings. Adjusting the arms was dependent on the size of the cylinder which, in turn, was reflective of the image repeat length.




While close-fit tolerances of the adjusting arms, shaft, and cylinder facilitate stable and quality printing, a first problem arises in that the tolerances also impede loading of the printing plate cylinder. A second problem arises in that although the cylinder may be properly loaded, the conventional method still requires additional user intervention by requiring that the coarse ink and impression settings be adjusted to coordinate with the size and location of the cylinder.




An alternative method for loading and registering the cylinder involves clamping the two ends of the cylinder in cam followers; the actual contact of the cam followers occurring against wheels on the printing press assembly. However, although the cam followers help minimize the first of the two problems, the second problem still remains, i.e., user intervention is still required to register the ink and impression settings.




Thus, although a number of methods exist for positioning printing press cylinder rolls in the printing nip of a printing press, these approaches have proven to be imperfect for the previously detailed reasons. Accordingly, a new apparatus and method are needed which can quickly and effectively lower a printing press cylinder roll into the printing nip.




SUMMARY OF THE INVENTION




The invention herein contains multiple embodiments including an adjustable arm adapted for use in a printing press, a printing press, and a method for loading a printing press roll in a printing press. A first embodiment of the adjustable arm assembly includes a first stationary plate, a first movable plate movably connected to the first stationary plate, and a speed control mechanism. The first movable plate includes one of a catch or a capture knob assembly adapted to engage a first end of a printing press roll. The speed control mechanism is adapted to control the speed by which a printing press cylinder roll is lowered, is connected to the first movable plate, and is adapted to be connected to an inner surface of a printing press.




In a second embodiment of the adjustable arm assembly, the speed control mechanism may be at least one of an air cylinder and a hydraulic cylinder. In addition, the catch may comprises a semicircular rib which, in turn, may be adapted to support a boss projecting from a cylindrical printing press roll. Further, the rib may be connected to a plate. In addition, the catch may also include a bore block adapted to engage an end of a shaft of a printing press roll. In another embodiment, the first movable plate may be connected to the first stationary plate by a plurality of wheels.




Another embodiment of the adjustable arm assembly may include a second stationary plate and a second movable plate movably connected to the second stationary plate by a plurality of wheels. In this embodiment, the second movable plate may include the other of the catch or capture knob assembly, wherein the other of the catch or capture knob assembly is adapted to engage a second end of a printing press roll.




Another adjustable arm assembly embodiment may include a disengagement mechanism connected to the first stationary plate. Further, the disengagement mechanism may include a rotatable block, a wheel mechanism adapted to rotate the rotatable block, and/or a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block. In addition, the drive mechanism may be at least one of an air cylinder and a hydraulic cylinder. Similarly, in this embodiment, the speed control mechanism may be at least one of a second air and a second hydraulic cylinder.




In an embodiment of the adjustable arm assembly having a disengagement mechanism therein, the assembly may additionally include a rod engaged with a first movable plate and adapted to be releasably engaged with a bore in a rotatable block of the disengagement mechanism.




Another embodiment of the adjustable arm assembly may include a disengagement mechanism which is connected to the first stationary plate and which is adapted to inhibit movement of the first movable plate with respect to the first stationary plate.




As previously mentioned, the invention also pertains to a printing press. A first embodiment of the printing press according to the present invention includes a housing having an inner surface, an adjustable arm assembly connected to the inner surface, and at least one roll adapted to be contacted by a printing press roll when the printing press roll is lowered by the adjustable arm assembly into the press. In this embodiment, the adjustable arm assembly includes a first stationary plate, a first movable plate movably connected to the first stationary plate, and a speed control mechanism. Further, the first movable plate includes a catch adapted to engage a first end of the printing press roll. In addition, the speed control mechanism is adapted to control the speed by which the printing press cylinder roll is lowered, is connected to the first movable plate, and is adapted to be connected to an inner surface of a printing press.




In a second another embodiment of the printing press, the first movable plate may be connected to the first stationary plate by a plurality of wheels. In another embodiment of the printing press, the at least one roll may be an anilox roll and/or an impression roll. In another embodiment, the speed control mechanism may be at least one of an air cylinder and a hydraulic cylinder. In yet another embodiment, the catch may include a semicircular rib. Further, the semicircular rib may be adapted to support a boss projecting from a cylindrical printing press roll. In addition, the rib may be connected to a plate and the catch may also include a bore block adapted to engage an end of a shaft of a printing press roll.




Another embodiment of the printing press may include a second stationary plate and a second movable plate movably connected to the second stationary plate by a plurality of wheels. Further, the second movable plate may include a capture knob assembly adapted to engage a second end of a printing press roll. In yet another embodiment of the printing press, a disengagement mechanism may be provided which is connected to the first stationary plate. Further, the disengagement mechanism may include a rotatable block, a wheel mechanism which is adapted to rotate the rotatable block, and a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block. In addition, the drive mechanism may be at least one of an air cylinder and a hydraulic cylinder. Similarly, the speed control mechanism may be at least one of a second air and a second hydraulic cylinder.




Another embodiment of the printing press may include a rod which is engaged with the first movable plate and which is adapted to be releasably engaged with a bore in a rotatable block. In addition, another embodiment of the adjustable arm assembly may include a disengagement mechanism which is connected to the first stationary plate and which is adapted to inhibit movement of the first movable plate with respect to the first stationary plate.




A method for loading a printing press cylinder roll in a printing press is also contemplated by the current invention. This method includes: (a) positioning a right end of a printing press cylinder roll in a right adjustment arm assembly; (b) positioning a left end of the printing press cylinder roll in a left adjustment arm assembly; (c) actuating a plate roll capturing knob assembly to lock the printing press cylinder roll with respect to the adjustment arm assemblies; and (d) lowering the printing press cylinder roll and the left and right adjustment arm assemblies from an insertion position to a loaded position in which the printing press cylinder roll contacts at least one roll in the printing press.




The aforementioned method may additionally include (e) limiting the speed by which the printing press cylinder roll is lowered. Further, the step of limiting the speed by which the printing press cylinder roll is lowered may be performed by an air or hydraulic cylinder.




Additionally or alternatively, the method may include (e) (or (f)) fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press. Further, the step of fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press may include turning a rod engaged with a disengagement mechanism and a movable plate of one of the adjustable arm assemblies.




The method may also include: (e) engaging a disengagement mechanism when the printing press cylinder roll contacts the at least one roll in the printing press; and (f) fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press. In addition, the disengagement mechanism may include a threaded rod. Further, the disengagement mechanism may also include a rotatable block, a wheel mechanism which is adapted to rotate the rotatable block adapted to engage the threaded rod, and a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block.




Another embodiment of the method, the step of actuating a plate roll capturing knob assembly to lock the printing press cylinder roll with respect to the adjustment arm assemblies comprises: (i) turning a capture knob on the right adjustable arm assembly to force a plunger into the right end of the printing press cylinder roll; and (ii) forcing a left end of the printing press cylinder roll to engage a catch formed in the left adjustable arm assembly.




Another embodiment of the method may include, before the steps of positioning the right end of a printing press cylinder roll in the right adjustment arm assembly and positioning the left end of the printing press cylinder roll in the left adjustment arm assembly, the step of: raising automatically the right and left adjustment arm assemblies to a cylinder roll loading position. Further, the step of automatically raising the right and left adjustment arm assemblies may involve actuating the left and right adjustable arm assemblies simultaneously.




The method may also include: (e) replacing the printing press cylinder roll with a second printing press cylinder roll. Further, the step of replacing the printing press cylinder roll may be automated. In addition, the method could also additionally include: (f) adjusting the second printing press cylinder roll with respect to the at least one roll in the printing press.




An embodiment of the method may also include: (e) establishing automatically a predetermined clearance between the printing press cylinder roll and the at least one roll of the printing press. Further, the step of establishing automatically a predetermined clearance between the printing press cylinder roll and the at least one roll of the printing press may include: (i) engaging a disengagement mechanism to lock the right and left adjustment arm assemblies in the loaded position; and (ii) activating an adjustment arm raising mechanism to push the right and left adjustment arms assemblies towards the insertion position to attain the predetermined clearance. In addition, the predetermined clearance is between about 0.00001″ and about 0.01″.




Another embodiment of the method may include: (e) establishing automatically a predetermined clearance between the printing press cylinder roll and the at least one roll of the printing press; and (f) fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press. Further, the step of fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press may include: turning a rod engaged with a disengagement mechanism and a movable plate of one of the adjustable arm assemblies.




Finally, in any of the previous method embodiments, the at least one roll in the printing press may be an anilox roll and/or an impression roll.




These and other features, aspects, and advantages of the present invention will become more apparent from the following description, appended claims, and accompanying exemplary embodiments shown in the drawings.











BRIEF DESCRIPTION OF THE DRAWINGS




The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention and together with the description, serve to explain the principles of the invention.





FIG. 1

is an exploded view of the various parts used in a left side adjustable arm assembly for automatically loading a printing press cylinder;





FIG. 2

is a perspective view of a left side adjustable arm assembly having the parts of

FIG. 1

;





FIG. 3

is a side cross-sectional view of a left catch;





FIG. 4

is a cross-sectional view of a print cylinder;





FIG. 5

is a perspective view of a capture knob assembly having a helical slit in a tube portion thereof;





FIG. 6

is a perspective view of a plunger housed within the capture knob assembly of

FIG. 5

;





FIG. 7A

is a side cross-sectional view of the capture knob assembly of

FIG. 5

showing the plunger of

FIG. 6

, which slides in and out of the tube portion of the capture knob assembly, in a first position;





FIG. 7B

is a side cross-sectional view of the capture knob assembly of

FIG. 7A

showing the plunger in a second position, the cross-section being taken along the same plane of the capture knob assembly as the cross-section of

FIG. 7A

;





FIG. 8

is a side view of the capture knob assembly including a position sensor and a lateral adjustment knob;





FIG. 9

is a side view of an inverted cone engaging a boss which projects from a stationary plate;





FIG. 10

is a side cross-sectional view of a disengagement mechanism showing a rotatable block thereof in an engaged position;





FIG. 11

is a side cross-section view of the disengagement mechanism of

FIG. 10

showing the rotatable block in a disengaged position;





FIG. 12

is a side view of a press cylinder loaded between two adjusting arm assemblies each of which is connected to an inner surface of a printing press, the cylinder being above an anilox roll of a printing press;





FIG. 13

is a side view of the press cylinder of

FIG. 12

having been lowered into a position at which is adjacent the anilox roll of the printing press;





FIG. 14

is a perspective view of a second embodiment of a capture knob assembly;





FIG. 15A

is a side cross-sectional view of the capture knob assembly of

FIG. 14

showing a plunger and a capture knob in a first position; and





FIG. 15B

is a side cross-sectional view of the capture knob assembly of

FIG. 15A

showing the plunger and capture knob in a second position, the cross-section being taken along a different plane of the block (in which the capture knob assembly is housed) than the cross-section of FIG.


15


A.











DETAILED DESCRIPTION




Reference will now be made in detail to presently preferred embodiments of the invention, which are illustrated in the drawings. An effort has been made to use the same reference numbers throughout the drawings to refer to the same or like parts.





FIG. 1

is an exploded view of the various parts of a left-side adjusting arm assembly


12


according to one embodiment consistent with the present invention. The adjusting arm assembly


12


is for automatically loading a printing press cylinder (also called a “printing press roll” or a “plate roll”)


26


shown in FIG.


4


.

FIG. 2

is a perspective view of the left side assembly


12


of

FIG. 1

fully assembled.

FIG. 12

is a side view of a press cylinder loaded between two adjusting arm assemblies each of which is connected to an inner surface of a printing press, the cylinder being above an anilox roll of a printing press.

FIG. 13

is a side view of the press cylinder of

FIG. 12

having been lowered into a position at which is adjacent the anilox roll of the printing press.




The left side assembly


12


includes a roll catch


20


, a movable plate


30


, a stationary plate


40


, an air cylinder


50


(which may, for example, be solenoid actuated), and a disengagement mechanism


90


, each of which will be discussed in turn. A right side assembly is the mirror image of the left side assembly


12


except that a capture knob assembly


150


/


250


(later discussed in detail) replaces the roll catch


20


. Further, due to the weight of the press cylinder


26


supported by the adjustable arm assemblies


12


, it is preferable that at least the stationary plates


40


, the movable plates


30


, the catch


20


, capture knob assembly


150


, and the disengagement mechanisms


90


be formed out of strong materials such as, for example, steel.




The roll catch


20


depicted in

FIG. 1

is positioned on the left side of cylinder roll


26


. A side cross-sectional view of the left load catch


20


is provided in FIG.


3


. The left side roll catch


20


comprises a plate


21


, semicircular rib


24


, and a bore block


22


in a central portion of the plate


21


. The bore block


22


is adapted to receive an end


29


(shown in

FIG. 4

) projecting from a shaft


28


of a cylinder roll


26


(i.e., the bore block


22


acts as a female engagement mechanism which receives the end


29


of the shaft


28


which acts as the corresponding male engagement mechanism). It should be noted that an indentation


18


may be provided in the bore block


22


which will be better adapted to engage with cylinder rolls


26


which have pointed ends


29


on the shaft


28


thereof. The plate


21


of the left side catch


20


is connected to the movable plate


30


associated therewith by a plurality of fasteners


23


.




Preferably (and for reasons later described in detail), on the right side of the cylinder roll


26


(which engages the capture knob assembly


150


/


250


), the orientation of the male/female engagement is reversed, i.e., the female member is on the cylinder roll


26


in the form of a plunger hole


152


adapted to receive a tip


154


of a plunger


98


/


298


projecting from the capture knob assembly


150


/


250


.




To load a cylinder roll


26


into the left side catch


20


, the end


29


projecting from the left end of the shaft


28


is positioned against the bore block


22


in the plate


21


of the left side catch


20


; the shaft


28


is positioned such that it rests on the semicircular rib


24


. The left side catch


20


, which acts as a spring-loaded bushing, also comprises a hollow tube


25


in which a spring


27


is compressible. When the bore block


22


receives the end


29


of the cylinder shaft


28


and pressure is applied thereto, the bore block


22


is pushed into the tube


25


thereby compressing the spring


27


. Further, easy sliding of the bore block


22


is ensured by its distal end


314


being journalled through a bore


316


.




Having explained the left side catch


20


, an understanding of the capture knob assembly


150


/


250


is necessary to understand how the right side of the cylinder roll


26


is fixed in a printing press. A first embodiment of a capture knob assembly


150


, which is shown in

FIGS. 5-8

, includes a capture knob


95


which is connected to a hollow tube


96


having a helical slot


99


formed therein. As shown in

FIG. 5

, a front portion of the hollow tube has a plate


21


thereon which supports a semicircular rib


24


both of which are similar to the plate


21


and the rib


24


on the left side catch


20


.




A projection


97


extends out of the helical slot


99


and slides within a linear slot


156


formed above the tube


96


in a wall of the press, as shown in

FIGS. 7A and 7B

; the linear slot


156


runs parallel to the tube


96


. When the capture knob


95


is turned, the projection


97


is moved, by the helical slot


99


, linearly along the linear slot


156


.




The projection


97


, which may be in the form of a steel rod or ball, is connected to a plunger


98


(as shown in

FIG. 6

) which is journalled within the hollow tube


96


. Accordingly, when the capture knob


95


is turned clockwise (and the projection


97


moves linearly along the tube


96


away from the capture knob


95


), an end of plunger


98


away from the capture knob


95


will move from a first position (

FIG. 7A

) in which the plunger


98


is substantially housed within the hollow tube


96


to a second position (

FIG. 7B

) in which the plunger


98


protrudes, from the end of the hollow tube


96


.




A tip


154


of the plunger


98


is adapted to slide into the hole


152


in the right end of the cylinder roll


26


thereby engaging the plunger


98


to the roll


26


. A further turning of the capture knob


95


will push the left end


29


of the cylinder shaft


28


against the bore block


22


shown in

FIG. 3

(thereby compressing the spring


27


in the left catch). As a result of the pressure applied to both ends of the cylinder roll


26


, the cylinder roll


26


will be fixedly held by the left catch


20


and by the capture assembly


150


.




Preferably, the pressure applied to the capture knob assembly


150


is adjustable. After applying the desired pressure to cylinder roll


26


by means of the capture assembly


150


, the rotation of the capture knob


95


can be locked in any conventional manner. For example, a collar


158


can be provided around a base of the knob


95


. If the collar


158


has a plurality of holes


162


provided at periodic locations around the collar


158


, and if the knob


95


has a bore (or hole)


159


therein (or therethrough), when the knob


95


is sufficiently turned, a rod


157


can be journalled through a hole


162


in the collar


158


and then into (or through) the bore/hole


159


in the knob


95


(and possibly through a second hole


162


in the collar


158


on the opposite side of the collar


158


as the first hole


162


). When the rotation of the capture knob


95


is locked, the cylinder roll


26


is locked in place between the left catch


20


and the capture rod assembly


150


.




The capture rod assembly may also comprise a position sensor


160


and/or a lateral adjustment knob


170


, both of which are shown in FIG.


8


. The position sensor


160


may be used to determine when the plunger


98


is sufficiently extended from the capture rod assembly


150


to engage the right end of the cylinder roll


26


while preventing damage to either the cylinder roll


26


or the plunger


98


which might result if the plunger


98


is pushed with too great a pressure against the right end of the cylinder roll


26


.




The lateral adjustment knob


170


would be used in cases where the capture knob assembly


150


applies a fixed pressure to the cylinder roll


26


to lock it between the left catch


20


and the plunger


98


(i.e., where a collar


158


or other adjustable locking mechanism is not employed). The lateral adjustment knob


170


shown in

FIG. 8

is fixed with respect to a body


305


of the press (i.e., the clearance CL-A between the lateral adjustment knob


170


and the body


305


does not change when the lateral adjustment knob


170


is turned). The lateral adjustment rod


170


is connected to a rod


172


having a threaded portion


174


on the far end thereof. The rod


172


can be positioned to run through a bore in the capture knob


95


and into a hole the plunger


98


.




The threaded portion


174


of the rod


172


can be connected to a correspondingly threaded portion


176


of the plunger


98


. When the threaded portion


174


is engaged to the plunger


98


, the lateral adjustment knob


170


can be used to pull (or push) the capture knob assembly


150


thereby increasing or decreasing the pressure on the cylinder roll


26


. Of course, it should be readily appreciated that a threaded engagement is merely exemplary of the type of engagement which can established between the rod


172


and the plunger


98


. Further, although it is preferable to connect the lateral adjustment knob


170


to the plunger


98


, the lateral adjustment knob


170


could be engaged to the capture knob


95


to provide similar advantages.




A second embodiment of the a capture knob assembly


250


is provided in

FIGS. 14 and 15

.

FIG. 14

is a perspective view of the second embodiment of the capture knob assembly


250


.

FIG. 15A

is a side cross-sectional view of the capture knob assembly


250


showing a plunger


298


and a capture knob


295


in a first position and

FIG. 15B

is a side cross-sectional view of the capture knob assembly of

FIG. 15A

showing the plunger


298


and capture knob


295


in a second position.




Unlike the previously described capture knob assembly


150


, in this embodiment, as shown in

FIG. 14

, the plunger


298


is integral with the capture knob


295


. Although the plunger


298


has a projection


297


extending therefrom which is similar to the previously described projection


97


, unlike the previous embodiment, this projection


297


will rotate when the capture knob


295


is rotated. As a result, the projection


297


will travel laterally in a helical channel


299


formed in a block


300


surrounding the plunger


298


. However, as the capture knob


295


is integral with the plunger


298


, the knob


295


will move from an unengaged position (

FIG. 15A

) to an engaged position (

FIG. 15B

) thereby reducing a clearance between the capture knob


295


and the block


300


; the clearance will change from a first clearance CL-B


1


to a narrower second clearance CL-B


2


. Further, it should be understood that cross-section of

FIG. 15B

is taken along a different plane of the block


300


(in which the capture knob assembly


250


is housed) than the cross-section of

FIG. 15A

so that the projection


297


remains visible in the figure.




Additional improvements could be made to the second embodiment of the capture knob assembly


250


. For example, the capture knob assembly could be provided with a position sensor


160


and/or a lateral adjustment knob


170


of the type previously described with respect to the first embodiment capture knob assembly


150


.




Referring to

FIG. 1

, each of the movable plates


30


has a plurality of wheels


32


(i.e., v-roller bearings) connected thereto. The wheels


32


are positioned on the side of the plates


30


on the side which is adjacent the cylinder


26


between the movable plates


30


. Further, the wheels


32


are mounted such that they freely rotate along axes which are substantially perpendicular to the movable plates


30


. Although only two wheels


32


are visible in

FIG. 1

, it is to be understood that more wheels may be used. Preferably, each plate


30


will have four wheels


32


, one positioned in the vicinity of each corner of the generally rectangular plate (as shown in FIG.


2


). Regardless of the numbers of wheels


32


employed, each wheel


32


attached to a movable plate


30


should be positioned such that the outer circumference thereof will rest within a channel


33


formed in the stationary plate


40


associated with the movable plate


30


.




As shown in

FIGS. 1 and 2

, the left side stationary plate


40


has two channels


33


positioned therein. The first channel


33


A is separated into two section whereas the other channel


33


B may run the length of the stationary plate


40


. To connect the movable plate


30


to the stationary plate


40


, the following steps are taken; (a) the movable plate


30


is laid upon the stationary plate


40


; (b) the wheels


32


are inserted into the channels


33


in the stationary plate such that the wheels' axes are aligned with fastener holes


36


in the movable plate


30


; and (c) fasteners


34


are journalled through the wheels


32


and into the fastener holes


36


in the movable plate


30


. As a result of the wheels


32


on both sides of the stationary plate


40


, the movable plate


30


is movably connected to the stationary plate


40


.




Each movable plate


30


is prevented from rolling off of the stationary plate


40


associated therewith by a projection


38


on the stationary plate


40


. The projection


38


projects between wheels


32


on one side the movable plate


30


(i.e., the projection


38


divides the first channel


33


into its respective parts


33


A) As a result, the movable plate


30


can not be completely disengaged from the stationary plate


40


.




When a cylinder


26


is loaded in the left roll catch


20


and right capture knob assembly


150


/


250


(as shown in FIG.


12


), the cylinder


26


will fall under its own weight until its outer surface contacts the printing press anilox roll (as shown in

FIG. 13

) and/or the impression roll. The speed by which the cylinder falls is limited by a speed control mechanism in the form of an air cylinder


50


, one end of which is connected to the movable plate


30


by a fastener


49


and the other end of which is connected to an inner surface of the printing press. Specifically, when the cylinder


26


is to be placed into the left catch


20


and into the capture knob assembly


150


/


250


, a rod


52


of the air cylinders


50


(connected to each movable plate


30


) will be fully extended from the air cylinder


50


.




It should be noted that, as the assembly


12


shown in

FIGS. 1 and 2

is not installed in a printing press, the rod


52


is shown as being substantially housed within the air cylinder


50


when the movable plate


30


is in the upper position (i.e., the position in which print cylinders


26


are exchanged). In actualilty, however, when the movable plate


30


is in this position, the rod


52


would be extended and a lower end


87


of the air cylinder


50


would be connected to the printing press by means of the pin


54


.




When the print cylinder


26


is loaded, the rods


52


of each assembly


12


will be pulled (by means of compressed air pressure) back into the air cylinders


50


associated therewith, thereby causing air in the air cylinders


50


to be exhausted through one or more vents


53


therein at a substantially fixed rate. The fixed rate exhaustion of the air in the air cylinders


50


inhibits the print cylinder


26


from accelerating when falling toward the anilox roll and/or the impression roll, i.e., the print cylinder


26


falls at a substantially fixed rate. In addition, a speed governor (not shown), such as a oil filled dashpot damper, may be used as an alternative to, or in conjunction with, the air cylinder


50


to fix an upper limit on the speed at which the print cylinder


26


falls toward the anilox roll. When the print cylinder


26


has reached the anilox roll, the rods


52


will be substantially housed within the air cylinders


50


and the disengagement mechanisms


90


will be activated.




As shown in

FIGS. 1

,


10


, and


11


, the disengagement mechanism


90


comprises a connection plate


58


, an L-shaped plate


67


(which may be formed by two separated pieces of steel to reduce manufacturing costs), a cover plate


60


, a rotatable block


64


, a wheel mechanism


66


, and a drive mechanism which is preferably a solenoid actuated air cylinder


68


. The connection plate


58


includes a plurality of screw holes


82


which are adapted to be aligned with bores


84


in the L-shaped plate


67


and further aligned with bores


83


in the cover plate


60


. Similarly, the connection plate


58


includes a screw hole


80


which is adapted to be aligned with a bore


73


in the rotatable block


64


and further aligned with a bore


70


in the cover plate


60


. In addition, the connection plate


58


comprises bores (not shown) in an underside thereof which are sized to receive springs


56


projecting from the stationary plate


40


, as later described in detail. Finally, the connection plate


58


includes a vertical slot


59


sized to receive a pin


71


of the wheel mechanism


66


; the pin


71


extends through the wheel


69


and serves as an axle.




The connection plate


58


is connected to the stationary plate


40


by being inserted into a window


46


(shown in

FIG. 1

) in the stationary plate


40


and pushed downward such that the springs


56


of the stationary plate


40


are received in the bores (not shown) in the underside of the connection plate


58


. The connection plate is inserted from the side of the stationary plate


40


opposite the movable plate


30


. The connection plate


58


is prevented from passing through the widow


46


by means of a lip


48


on an outer edge of the connection plate


58


which is adapted to sit in a milled-out groove (not shown) in the back side of the stationary plate


40


when the connection plate


58


is inserted in the window


46


. Further, the connection plate


58


will be prevented from falling backward out of the window


46


because a threaded rod


110


(later discussed in detail) on the other side of the window


46


is engaged with the rotatable block


64


which, in turn, is connected to the connection plate


58


.




After the connection plate


58


is connected to the stationary plate


40


, the L-shaped plate


67


can be positioned against the connection plate


58


such that the bores


84


in the L-shaped plate are aligned with the holes


82


in the connection plate


58


. At this time, the wheel member


66


can be positioned such that a pin


71


projecting along the axis of the wheel


69


is inserted into the vertical slot


59


in the connection plate


58


. In addition, the rotatable block


64


can be positioned so that the bore


73


therethrough is aligned with the hole


80


in the connection plate


58


. When the bore in the rotatable block


64


is aligned with the hole


80


in the connection plate


58


, a front portion


72


of the rotatable block


64


is adapted to rest on a ledge


74


on the wheel member


66


such that an angled front face


76


may abut the wheel


69


of the wheel member


66


, as shown in FIG.


10


.




After the L-shaped member


67


, the wheel member


66


, and the rotatable block


64


are properly aligned with connection plate


58


, the cover plate


60


can be positioned such that: (a) the bores


83


therein are aligned with the bores


84


in the L-shaped plate


67


and with the screw holes


82


in the connection plate


58


; (b) the bore


70


therein is aligned with the bore


73


in the rotatable block


73


and the screw hole


80


in the connection plate


58


; and (c) a second pin


71


on the wheel member


66


is inserted into a vertical slot


62


in the cover plate


60


. Finally, fasteners


78


(e.g., screws) can be pushed through the bores


83


in the cover plate


60


and the bores


84


in the L-shaped plate


67


and screwed into the screw holes


82


in the connection plate


58


. Due to the plurality of fasteners


78


connecting the cover plate


60


, the L-shaped plate


67


, and the connection plate


58


, the cover plate


60


, L-shaped plate


67


, and connection plate


58


will be unable to move with respect to each other.




By way of contrast, although the wheel member


66


will be “locked” between the cover plate


60


and the connection plate


58


(by means of the pins


71


projecting therefrom which are received in the vertical slots


62


,


59


in the cover plate


60


and the connection plate


58


), the wheel member


66


will be able to slide vertically to the extent permitted by the vertical slots


62


,


59


. Further, after a fastener


70


is pushed through the bore


73


in the cover plate


60


, through the bore


73


in the rotatable block


64


, and screwed into the hole


80


in the connection plate


58


, the rotatable block


64


will be able to rotate around the fastener


70


therethrough.




After the cover plate


60


, L-shaped plate


67


, wheel member


66


, rotatable block


64


, and the connection plate


58


are connected, a top end of a spring-loaded telescoping arm


81


of the air cylinder


68


can be journalled through a bore


79


in the L-shaped plate


67


and connected to the wheel member


66


. A lower end


85


of the air cylinder


68


, like the lower end


87


of the other air cylinder


50


will be connected to the printing press.




After the disengagement mechanism


90


is assembled, a threaded rod


110


is screwed through screw holes


102


,


104


in the movable plate


30


. It is also possible to connect the rod


110


and the movable plate


30


in other equally feasible ways such as, for example, employing snap rings such that the cross-section of the rod


110


in the holes


102


,


104


is smaller than the cross section of the rod


110


above and below each of the holes


102


,


104


. The important factor is that the position of the rod


110


be substantially fixed with respect to the movable plate


30


.




After screwing the threaded rod


110


through the screw holes


102


,


104


it is screwed downward until it encounters the bore


77


in the rotatable block


64


. Note that when the wheeled mechanism


66


is in the downward position, such that the rotatable block


64


is substantially parallel to the L-shaped plate


67


, the threaded rod


110


will engage corresponding thread portions


112


,


114


in the rotatable portion


64


, as shown in FIG.


10


. The threaded rod


110


is screwed through the block


64


and passes through the bore


75


in the L-shaped plate


67


. The upper end of the threaded rod


110


is fixed to the press, as shown in FIG.


2


. Although the threaded rod


110


is shown as being threaded along its length, this is not necessary. Rather, the threaded rod need only be designed to engage the rotatable block


64


along the threaded portions


112


,


114


and be immobile with respect to the movable plate


30


.




After each disengagement mechanism


90


is fully assembled, the assemblies


12


will be connected to a printing press as follows: (a) each stationary plate


40


is positioned in a predetermined position against a wall


120


(shown in

FIG. 2

) in the printing press such that the movable plate


30


associated therewith is on the side of the stationary plate


40


opposite the printing press wall; (b) fasteners


92


(shown in

FIG. 1

) are screwed through a curved slot in counterbore


94


in the stationary plate


40


and into screw holes (not shown) in the wall


120


of the printing press behind the stationary plate


40


(later, as will be described in detail, the stationary plate is adapted to rotate along the wall


120


because the fasteners


92


are adapted to ride in the curved slots); (c) the fasteners


92


are screwed until the heads thereof rest within wells


96


in the stationary plate


40


; and (d) that lower ends of the air cylinders


50


,


68


are affixed to a lower surface of the press, as shown in

FIGS. 12 and 13

.




Referring to

FIG. 1

, after each stationary plate


40


(with its respective movable plate


30


affixed thereto) is affixed to the wall


120


of the press, the anilox and impression rolls are connected as follows. The anilox roll slides into a semicircular wedge


190


such that it will rotate around a central point (indicated by crosshairs


192


) in the semicircular wedge


190


. Similarly, each end of the impression roll is journalled through a rectangular opening


196


in the movable plate


30


and into circular openings


194


in the stationary plate


40


. The rectangular opening


196


in the movable plate provides clearance such that when the movable plate is raised and lowered, the impression roll is neither affected nor contacted.




Use of a printing press having the assembly installed therein will now be described in detail. Before a print cylinder


26


is loaded for use in the printing press, the telescoping arm


81


of the air cylinder


68


will be extended thereby pushing the wheel member


66


upward such that the pins


71


projecting therefrom are positioned in the uppermost positions in the vertical slots


62


,


59


in the cover plate


60


and the connection plate


58


. In this position, as shown in

FIG. 11

the threaded portions


112


,


114


of the rotatable portion


64


disengage from the threaded rod


110


thereby enabling the threaded rod


110


(with the movable plate


30


affixed thereto) to move vertically upward with respect to the disengagement mechanism


90


.




Referring to

FIG. 11

, when the rotatable block


64


is disengaged from the threaded rod


110


, the movable plate is driven upward by air cylinder


50


. When the movable plate is at its upper position, the left end of the print cylinder roll


26


is affixed to left side catch


20


and the right end of the cylinder roll


26


is locked using the capture knob assembly


150


/


250


, as previously described. When the cylinder


26


is loaded, it will be lowered by the air cylinders


50


(i.e., the telescoping arms


52


are pulled back into the air cylinders


50


and air is vented therefrom through the vents


53


) until its outer surface contacts the anilox roll and/or the impression roll, i.e., until it becomes “nested” with respect to either or both of the anilox and impression rolls as shown in FIG.


13


.




At this point, the telescoping arms


81


of each disengagement mechanism


90


are pulled downward into their respect air cylinders


68


. When the arms


81


are pulled downward, they correspondingly pull the wheel members


66


downward. In turn, the wheels


69


of the wheel members push downward on the sloped faces


76


of the rotatable blocks


64


thereby causing the blocks to rotate back to the orientation shown in FIG.


10


. When the rotatable blocks rotate back toward the horizontal, the threaded portions


112


,


114


therein engaged the threaded rod


110


such that the threaded rod is no longer movable with respect to the disengagement mechanism, i.e., it is “locked.”




When the threaded rods


110


are locked, the air cylinders


50


will be actuated again in an attempt to push the movable plates


30


upward. However, because the movable plates


30


are fixedly connected to the threaded rods


110


, the attempted upward movement of the movable plates


30


will be substantially thwarted. However, although the upward motion of the movable plates


30


is thwarted, the force applied thereto by the telescoping arms


81


of the air cylinders is such that it raises the movable plates on the order of 0.0001″ of an inch away from the anilox and/or impression rolls thereby providing clearance which prevents the anilox and/or impression roll from being dented by the cylinder roll


26


. This 0.0001″ clearance is thus automatically generated whereas in the prior art such clearance needed to be achieved with operator intervention. Further, this clearance may be as great as 0.01″ and possibly as great as 0.02″.




If desired, fine-turning of the vertical position of the cylinder roll


26


can be accomplished with a knob


200


(shown in

FIG. 2

) connected to the top of each of the threaded rolls


110


which enables the threaded rod


110


to be turned. The turning of the threaded rods


110


will raise or lower the rods


110


(and the movable plates


30


affixed thereto) by enabling the rods


110


to be screwed with respect to the threaded portions


112


,


114


of the rotatable blocks


64


thereof.




In addition, fine-tuning of horizontal position of the cylinder roll


26


may be accomplished as follows.

FIG. 9

shows an inverted cone


210


which may be raised and lowered. When the cone


210


is lowered in the direction of arrow A, an angled face


216


thereof will abut a projection


42


which projects from the side of the stationary plate


40


against which the movable plate


30


is positioned. Due to further downward motion of the inverted cone


210


, the projection


42


will be forced to move (along sloped face


216


) in the direction of curved arrow B thereby causing a slight rotation of the stationary plate


40


. It should be noted that the stationary plate


40


is adapted to rotate because the fasteners


92


affixing it to the inner wall


120


of the printing press are adapted to ride in the curved slots in counterbores


94


formed in the stationary plate


40


. It also should be noted that the radius of each of the curved slots of the counterbores


94


have the same central point, i.e., the curved slots are on the circumference of a hypothetical circle. Further, the center of that hypothetical circle is preferably collocated with respect to the center of the anilox roll indicated by crosshairs


192


.




As a result of the rotation of the stationary plate


40


, the lower corner


218


of the stationary plate


40


will move in the direction of curved arrow D. When the lower corner


218


moves, a compressible member


212


(which may be a spring) will be slightly compressed and will roll, by means of wheels


214


, along a wall


220


of the press in the direction of arrow C.




If the cylinder roll


26


is pushed too far horizontally, the inverted cone


210


can be raised thereby causing the compressible member


212


to expand thereby, in turn, pushing the plate in the direction opposite arrow D (and moving the wheels


214


in the direction opposite to arrow C) such that the projection


42


moves in the direction opposite arrow B. As a result, the cylinder roll


26


will be moved back horizontally as far as necessary.




Although the aforementioned describes preferred embodiments of the invention, the invention is not so restricted. It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed preferred embodiments of the present invention without departing from the scope or spirit of the invention. For example, rather than allowing the print cylinder


26


to fall into position under its own weight (and having its fall controlled by air cylinder


50


), the system could employ a motor to lower (and raise) the cylinder


26


in a controlled manner. In addition, plastics and/or castings may be used instead of steel in manufacturing some of the parts (e.g., the air cylinders


50


,


68


) of the assembly


12


to reduce the cost of manufacturing the assembly


12


and to reduce the overall weight of the assembly


12


(and the printing press in which it is installed). Linear or slide bearings could be used instead of the wheels


32


to control the orientation of the movable plate


30


with respect to the stationary plate


40


. Finally, the system could be automated to enable a continuous and repetitive loading and adjustment of various printing press cylinder rolls


26


such that when one plate roll


26


is finished another plate roll


26


will be automatically loaded.




In addition to the aforementioned modifications, the invention is not limited to the field of printing presses. Rather, the invention is equally applicable to other related fields such as, for example, dye cutting apparatuses in which cutters must be loaded and properly registered. Accordingly, it should be understood that the apparatus and method described herein are illustrative only and are not limiting upon the scope of the invention, which is indicated by the following claims. Alternatives which would be obvious to one of ordinary skill in the art upon reading the teachings herein disclosed, are hereby within the scope of this invention.



Claims
  • 1. An adjustable arm assembly adapted for use in a printing press, the assembly comprising:a first stationary plate; a first movable plate movably connected to the first stationary plate, the first movable plate comprising: one of a catch or a capture knob assembly adapted to engage a first end of a printing press cylinder roll; and a speed control mechanism adapted to control the speed by which a printing press cylinder roll is lowered, wherein the speed control mechanism is connected to the first movable plate and is adapted to be connected to an inner surface of a printing press, and a disengagement mechanism connected to the first stationary plate, the disengagement mechanism comprising: a rotatable block; a wheel mechanism which is adapted to rotate the rotatable block; and a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block.
  • 2. The assembly according to claim 1, wherein the speed control mechanism is at least one of an air cylinder and a hydraulic cylinder.
  • 3. The assembly according to claim 1, wherein the catch comprises a semicircular rib.
  • 4. The assembly according to claim 3, wherein the semicircular rib is adapted to support a boss projecting from a cylindrical printing press roll.
  • 5. The assembly according to claim 3, wherein the rib is connected to a plate, and wherein the catch further comprises a bore block adapted to engage an end of a shaft of a printing press roll.
  • 6. The assembly according to claim 1, wherein the first movable plate is connected to the first stationary plate by a plurality of wheels.
  • 7. The assembly according to claim 1, further comprising:a second stationary plate; and a second movable plate movably connected to the second stationary plate by a plurality of wheels, the second movable plate comprising: the other of the roll catch or the capture knob, wherein the other of the roll catch or the capture knob assembly is adapted to engage a second end of a printing press roll.
  • 8. The assembly according to claim 1, wherein drive mechanism is at least one of an air cylinder and a hydraulic cylinder.
  • 9. The assembly according to claim 8, wherein the speed control mechanism is at least one of a second air and a second hydraulic cylinder.
  • 10. The assembly according to claim 1, further comprising:a rod engaged with the first movable plate and adapted to be releasably engaged with a bore in the rotatable block.
  • 11. The assembly according claim 1, wherein the disengagement mechanism is adapted to inhibit movement of the first movable plate with respect to the first stationary plate.
  • 12. A printing press comprising:a housing having an inner surface; an adjustable arm assembly connected to the inner surface, the assembly comprising: a first stationary plate; a first movable plate movably connected to the first stationary plate, the first movable plate comprising: at least one of a catch or a capture knob assembly adapted to engage a first end of a printing press cylinder roll; a speed control mechanism adapted to control the speed by which the printing press cylinder roll is lowered, wherein the speed control mechanism is connected to the first movable plate and adapted to be connected to an inner surface of a printing press; and a disengagement mechanism connected to the first stationary plate, the disengagement mechanism comprising: a rotatable block; a wheel mechanism which is adapted to rotate the rotatable block; and a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block; and at least one roll adapted to be contacted by the printing press cylinder roll when the printing press cylinder roll is lowered by the adjustable arm assembly.
  • 13. The printing press according to claim 12, wherein the disengagement mechanism is adapted to inhibit movement of the first movable plate with respect to the first stationary plate.
  • 14. The printing press according to claim 12, wherein the first movable plate is connected to the first stationary plate by a plurality of wheels.
  • 15. The printing press according to claim 12, wherein the at least one roll is an anilox roll.
  • 16. The printing press according to claim 12, wherein the at least one roll is an impression roll.
  • 17. The printing press according to claim 12, wherein the at least one roll comprises an anilox roll and an impression roll.
  • 18. The printing press according to claim 12, wherein the speed control mechanism is at least one of an air cylinder and a hydraulic cylinder.
  • 19. The printing press according to claim 12, wherein the catch comprises a semicircular rib.
  • 20. The printing press according to claim 19, wherein the semicircular rib is adapted to support a boss projecting from a cylindrical printing press roll.
  • 21. The printing press according to claim 19, wherein the rib is connected to a plate, and wherein the catch further comprises a bore block adapted to engage an end of a shaft of a printing press roll.
  • 22. The printing press according to claim 12, further comprising:a second stationary plate; and a second movable plate movably connected to the second stationary plate by a plurality of wheels, the second movable plate comprising: the other of the catch or the capture knob assembly, wherein the other of the catch or the capture knob assembly is adapted to engage a second end of the printing press roll.
  • 23. The printing press according to claim 12, wherein the assembly further comprises:a rod engaged with the first movable plate and adapted to be releasably engaged with a bore in the rotatable block.
  • 24. The printing press according to claim 12, wherein the drive mechanism is at least one of an air cylinder and a hydraulic cylinder.
  • 25. The printing press according to claim 24, wherein the speed control mechanism is at least one of a second air and a second hydraulic cylinder.
  • 26. A method for loading a printing press cylinder roll in a printing press comprising the steps of:positioning a right end of a printing press cylinder roll in a right adjustment arm assembly; positioning a left end of the printing press cylinder roll in a left adjustment arm assembly; actuating a plate roll capturing knob assembly to lock the printing press cylinder roll with respect to the adjustment arm assemblies; lowering the printing press cylinder roll and the adjustment arm assemblies from an insertion position to a loaded position in which the printing press cylinder roll contacts at least one roll in the printing press; engaging a disengagement mechanism when the printing press cylinder roll contacts the at least one roll in the printing press; and fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press, wherein the disengagement mechanism comprises:a threaded rod; a rotatable block adapted to engage the threaded rod; a wheel mechanism which is adapted to rotate the rotatable block; and a drive mechanism adapted to push the wheel mechanism so as to cause a rotation of the rotatable block.
  • 27. The method according to claim 26, wherein the at least one roll in the printing press comprises an anilox roll.
  • 28. The method according to claim 26, wherein the step of fine-tuning the orientation of the printing press cylinder roll with respect to the at least one roll in the printing press comprises turning the threaded rod, and wherein the threaded rod is engaged with a movable plate of one of the adjustable arm assemblies.
  • 29. The method according to claim 26, further comprising the step of:limiting the speed by which the printing press cylinder roll is lowered.
  • 30. The method according to claim 29, wherein the step of limiting the speed by which the printing press cylinder roll is lowered is performed by an air or hydraulic cylinder.
  • 31. The method according to claim 26, wherein the at least one roll in the printing press comprises an impression roll.
  • 32. The method according to claim 31, wherein the at least one roll in the printing press further comprises an anilox roll.
  • 33. The method according to claim 26, wherein the step of actuating a plate roll capturing knob assembly to lock the printing press cylinder roll with respect to the adjustment arm assemblies comprises:turning a capture knob on the right adjustable arm assembly to force a plunger into the right end of the printing press cylinder roll; and forcing a left end of the printing press cylinder roll to engage a catch formed in the left adjustable arm assembly.
  • 34. The method according to claim 26, wherein before the steps of positioning the right end of a printing press cylinder roll in the right adjustment arm assembly and positioning the left end of the printing press cylinder roll in the left adjustment arm assembly, the method further comprises the step of:raising automatically the right and left adjustment arm assemblies to a cylinder roll loading position.
  • 35. The method according to claim 34, wherein the step of automatically raising the right and left adjustment arm assemblies comprises:actuating the left and right adjustable arm assemblies simultaneously.
  • 36. The method according to claim 26, further comprising:replacing the printing press cylinder roll with a second printing press cylinder roll.
  • 37. The method according to claim 36, wherein the step of replacing the printing press cylinder roll is automated.
  • 38. The method according to claim 36, further comprising the step of:adjusting the second printing press cylinder roll with respect to the at least one roll in the printing press.
  • 39. The method according to claim 38, wherein the step of replacing the printing press cylinder roll is automated.
  • 40. The method according to claim 26, further comprising the step of:establishing automatically a predetermined clearance between the printing press cylinder roll and the at least one roll of the printing press.
  • 41. The method according to claim 40, wherein the step of establishing automatically a predetermined clearance between the printing press cylinder roll and the at least one roll of the printing press comprises the steps of:engaging the disengagement mechanism to lock the right and left adjustment arm assemblies in the loaded position; and activating an adjustment arm raising mechanism to push the right and left adjustment arms assemblies towards the insertion position to attain the predetermined clearance.
  • 42. The method according to claim 41, wherein the predetermined clearance is between about 0.00001″ and about 0.01″.
US Referenced Citations (11)
Number Name Date Kind
2901970 Knops et al. Sep 1959 A
3254598 Motter Jun 1966 A
3598050 Thompson Aug 1971 A
3789757 Motter et al. Feb 1974 A
4119031 Ottenhues Oct 1978 A
4132166 Bugnone Jan 1979 A
4998829 Greer Mar 1991 A
5117768 Seymour Jun 1992 A
5787813 Reising Aug 1998 A
6412409 Weishew Jul 2002 B2
6494138 Gottling et al. Dec 2002 B1