FLEXIBLE-SHEET-SECURING DEVICES

A carrier for transferring images comprising a paper treated with a release agent and coated with a binder emulsion, the binder being chiefly based on nitrile butadiene rubber obtained by copolymerization of butadiene and acrylonitrile.

A flexible printing plate carrier comprises a curved carrier plate at least one end of which has mounted thereon a rotatable tubular shaft having an axially extending projection about which a bent over end of the printing plate can be hooked. A pre-loaded torsion spring extends through the tubular shaft...     

A shell defining a semicylindrical printing saddle formed on one longitudinal side with a plate mount for receiving one end of a flexible printing plate having printing indicia thereon and on its opposite longitudinal side with a pair of circumferentially outwardly opening bores having sleeves mounted...     

A clamping device adapted to tighten a screen bottom onto a screen frame in a screening apparatus. The clamping device is provided with means disposed on one side of the screen frame for pneumatically tightening one side of the screen bottom to that side of the screen frame, the opposite side of the...     

Lock-up structure for applying a thin flexible press roll to a generally semi-cylindrical saddle comprising means for fixing one end of a printing plate to one straight edge of the saddle, and a bar at the other straight edge of the saddle. The bar includes means for affixing the opposite edge of the...     

A platen for a strip-up microfiche is equipped with a plurality of pin holders, half of which are fixed in position on one edge of the platen frame and the other half of which are movable seriatim within the opposite edge of the frame to grasp or release the edge of the microfiche which is not connected...     

A fastener for attaching a flexible cover or sheet, such as a canvas tarpaulin, to a structure to provide a cover for the structure, and also to provide an acceptable weather seal around the cover. The device comprises a channel member fixed to the structure to be covered, and used in cooperation with...     

A printing screen and tensioning means including a rigid frame structure formed of channel shaped side members joined at the corners of the frame structure; the underside of each frame member receiving a parallelogram structure, each parallogram structure having a first and second side member connected...     

Press cylinder structure for securing a printing plate over the cylinder's saddle. This saddle includes a first longitudinal edge permissably provided with a printing plate retainer bar, and the opposite edge of the saddle being spaced from an independent, movable, tensioned, printing-plate locking bar....     

The disclosure relates to an improved form of vacuum-operated printing cylinder for a printing press, providing a practical means for holding the printing plate on the cylinder by vacuum alone, without requiring separate adhesive means and/or supplementary mechanical devices for clamping the plate. In...     

A clamping and tensioning mechanism for mounting a thin flexible printing plate on the surface of a printing cylinder in which a mounting bar is provided having a longitudinal groove formed therein occupied by a clamping bar having upper and lower jaws which are shaped to deform and positively grip the...     

Clamping apparatus is provided for clamping thin flexible printing plates in position on a press cylinder. A continuously spring biased rigid clamping member is engageable with a bent over portion of the trailing edge of the printing plate to clamp the same against the circumference of a printing press...     

There is disclosed a rotary, work-support table having a plurality of interchangeable cylindrical work-support members which are removably mounted on a frame having end plates with bearing supports to receive bearing means carried on stub shafts of the cylindrical members. The device is useful as a work...     

An improved form of vacuum-operated printing cylinder for a printing press, providing a practical means for holding the printing plate on the cylinder by vacuum alone. The cylinder comprises a hollow supporting shaft forming a pre-evacuation chamber. A plurality of axially spaced support rings are secured...     

Disclosed is an improvement over a facsimile transmitter apparatus of the type in which a scanning system disposed within a transparent cylinder scans a subject copy wrapped around the cylinder, wherein one side edge of a subject copy wrapping belt is securely fixed to the outer surface of the cylinder...     

A cylinder for clamping printing plates for photogravure printing wherein the cylinder has a longitudinal bore comprising at least one clamping spindle with a surface for receiving the printing plate ends said at least the clamping spindle runs on the radius of the surface of the cylinder, wherein in...     

Apparatus for holding an end of a printing blanket on an associated printing cylinder is provided and employs an elongate holding bar and bar support which cooperate to prevent damage to the blanket at locations adjacent where the holding bar engages the blanket and such apparatus has means for quickly...     

A printing blanket holding bar and printing blanket assembly using same are provided wherein said holding bar comprises a substantially U-shaped member having a bight and a pair of legs extending from opposite ends of the bight and a blanket clamping arm carried by the bight with the arm being adapted...     

Apparatus for holding an end portion of a printing blanket on an associated printing cylinder is provided and employs an elongate holding bar and bar support which cooperate to hold such end portion in position in a highly efficient manner and the apparatus has double eccentric means for quickly attaching...     

A lithographic printing plate system utilizing a composite plate having an aluminum printing member that can be recycled. An aluminum printing member has a light-sensitive coating thereon which forms the image area of the plate together with the aluminum member itself. A carrier plate supports the aluminum...     

A system for locking thin flexible printing plates on to rotary printing press saddles includes securing means positioned along a first longitudinal side edge of such a saddle and a support member rotatably journaled along a second longitudinal side edge of the saddle and biased longitudinally away from...     

A blanket clamping and tensioning apparatus for use in a blanket cylinder in a rotary printing press is disclosed. An axial groove at the periphery of the blanket cylinder carries a pair of spaced inserts which define an interior chamber. A radially movable clamping bar assembly is carried within the...     

A printing press provides a pair of cylinders mounted for rotation about parallel axes. At least one of the cylinders carries a member wrapped thereon having circumferentially spaced edges defining a gutter. When the cylinders are rotated, an impact is generated when the gutter juxtaposes the adjacent...     

The disclosure is of a facsimile machine having a carrier for a sheet of paper, the carrier comprising a cylinder having a longitudinal band secured thereto by springs so that the band is normally pulled downwardly onto the surface of the cylinder. A sheet of paper is rolled about the cylinder, with...     

The sheet clamp apparatus is for clamping a sheet of original paper, recording paper, photosensitive paper, master plate, or the like on a drum usually provided in facsimile apparatus, copying apparatus, or the like. The apparatus comprises a single plate-shaped clamp member positioned along a generating...     

There is disclosed, a printing saddle lockup including a saddle mounted on a rotary printing cylinder and having a floating biasing bar disposed at one edge thereof. A recess is formed in the cylinder beneath the biasing bar and a cavity is formed in such bar over the recess and receives a rotary cam...     

A xerographic copier including a novel photoconductive belt and drive structure is disclosed. The thin metal belt is provided with at least one transverse break or gap and is preferably formed of two belt segments. In use, the break or gap between segments are held in end-to-end relationship by tow bars...     

A bending fixture for offset plates provided with positioning holes, the bending fixture including a platform having bending bars pivotally mounted at opposite ends thereof and plate hold-down members coacting therewith, where the hold-down members are raised away from and lowered toward the platform...     

The apparatus comprises a drum around which a photoconductor sheet is to be wound, a front end clamp member and a back end clamp member disposed in a recess formed along a generating line of the peripheral surface of the drum, a front end clamp member operation device, a back end clamp operation device,...     

A rotary anvil construction, method of locking a die-cutting mat on such construction, and locking wedge for use with such construction and method are provided wherein the locking wedge is an immobile wedge and has locking surfaces which are adapted to have cooperating locking surfaces on flanges of...     

Printing apparatus comprising a plate carrying impression cylinder and a flexible printing plate detachably securable thereon. Because the printing plate may be large and flexible, special apparatus is provided for positioning the plate on the cylinder and removing it therefrom, comprising a suction...     

Clamping apparatus is provided for holding thin flexible printing plates in position on a press cylinder. In some embodiments, shim members are attached to the outer periphery of the press cylinder for accurately radially positioning the printing plates with respect to the surface of the press cylinder....     

A coating roller having a cylindrical drum with a replaceable cover formed of a sheet metal substrate upon which is bonded a resilient plastic outer surface layer. A pair of closely spaced, parallel, longitudinally extending rigid strips are positioned upon the drum surface and fastened at their opposite...     

The disclosure relates to a stencil duplicator having a loading device in the form of a pair of guide members which are mounted for movement between a first position in which they define a slot into which a stencil can readily be inserted to attain a predetermined position and a second position in which...     

A preformed, thin metal printing plate is provided which permits the plate to snap on and lock to the printing cylinder of an offset printing device so that the plate is juxtapositioned the cylinder along the entire plate area between a leading edge of the plate and a reverse bend part of a trailing...     

A device is provided for the rapid clamping of flexible printing plates on the printing cylinder of rotary printing presses which includes a support bar mounted within and adjacent to the front side of a cylinder groove to which the forward end of plate is clamped by means of clamping springs and a clamping...     

A facsimile device of a type having a rotary drum and clamping bars movable toward and away from the drum surface to cooperate, when moved toward the drum surface, together with the drum surface in clamping therebetween the leading and trailing ends of a sheet. The device has a combination of electric...     

An apparatus for printing labels is disclosed, and more particularly a portable apparatus which will reproduce indicia of a master sheet on a continuous web substrate and thereafter cut the web into individual labels. The apparatus is provided with a rotatable plate roller, to which the master sheet...     

In an electrophotographic copier including a replaceable photoconductive sheet having a leading edge portion and a trailing edge portion and a guide drum rotatably supported by a drum shaft and having a circumferential surface for supporting the sheet and a holding device for securing the leading sheet...     

An electronic stencil cutter having a rotatable drum with an original subject sheet and a stencil sheet mounted side by side thereon. Scanning and stencil cutting heads are mounted on a common carriage for simultaneous movement along the original and stencil sheets. The original subject sheet is retained...     

A self-tensioning printing cylinder lock for fitting longitudinally in grooves formed between printing saddles on diametrically opposite sides of a printing press cylinder. Such lock includes a longitudinally extending base plate having a longitudinally elongated tensioning bar disposed in overlying...     

A vibration-free cylinder for a printing press in phased rolling engagement with a companion cylinder and which is formed of a cylinder body of star-shaped cross section having a central axial portion and four axial webs extending radially outward therefrom to define between them recesses of sector-shaped...     

A facsimile system has improved features for receiving copy medium and for printing. The system has a cylindrical rotatably driven drum that has an expansion device that allows the drum to expand its effective diameter. When the unit is used as a receiver, a cylindrical loop of copy medium is inserted...     

A plate lockup mechanism secures a printing plate to a printing cylinder. The mechanism includes two movable members disposed within the printing cylinder. Means connected with one of said members engages one end portion of the printing plate to secure the one end portion of the plate on the cylinder...     

A clamping device for securing a photoconductor in the form of a closed loop, flexible sleeve on a drum having a channel on the drum periphery, and with the channel running substantially parallel to the drum central axis, along the length of the drum, is disclosed. The clamping device comprises an elongated...     

An arrangement for facilitating the mounting of printing plates on a plate cylinder of an offset printing machine. Two arms are mounted atop the machine at the opposite lateral sides thereof and have free ends provided with hooks. A rail is suspended from these hooks and carries quick-coupling devices...     

To permit clamping of a flexible printing plate (2) around a circumference of a printing cylinder (1) in either direction, a clamping groove (3) is formed with two inclined side walls (4, 5) which converge towards the open side of the groove, and are positioned in mirror-image relation with respect to...     

A printing blanket holding bar adapted for insertion into a channel longitudinally extending along the periphery of a reel, the channel having a pair of flat, generally parallel side walls extending from the periphery of the reel, said holding bar comprising a base having a first flat surface and a second...     

The invention relates to a roller having a core with a channel formed in the surface which extends across the surface of the core. The channel is tapered in width from a first width adjacent a first edge to a second width adjacent a second opposite edge. A blanket is provided for covering the core with...     

There is disclosed, printing apparatus including a drum having oppositely facing semicylindrical saddles mounted thereon with elongated spaces between the edges of the saddles. The longitudinal edges of the saddles are beveled radially inwardly on themselves and an elongated laminated alternate pole...     

To provide for smooth running of a plate cylinder with respect to associated rollers or cylinders, such as the blanket cylinder of an offset printing machine, the plate cylinder is formed with an engagement surface (3, 4) including an angle of less than 45.degree. with respect to the tangent of the plate...     

A plate clamping device for clamping flexible printing plates in rotary printing machines includes an upper guiding rail and a lower guiding rail to receive and clamp a printing plate therebetween. The device is provided with two spaced from one another bolts and a clamping arrangement centrally positioned...     

An improved automatic printing plate exchange system is described herein, which comprises plate holding means adapted to be mounted to a printing plate while presenting a resilient effect as a whole and having anchor-shaped engaging sections along its front and rear edges, send-out means for sequentially...     

A process color offset duplicator uses a plurality of duplicator heads arranged serially to print full process color. The duplicator heads are adapted to apply a thin layer of ink onto plates held on their respective plate cylinders, in order that plate cylinders which are prepared using a dot screen...     

In the preparation of screen process stencils a stencil frame is enclosed tightly by a pneumatically operated frame. Once the stencil frame is enclosed the pneumatic tensioning frame is inflated pulling a screen fabric outwardly to stretch the same with a concomitant vertical movement of the frame member...     

A method of making-up offset printing cylinders having lock-ups positioned in gaps in the cylinders by use of a two piece system involving adhering a compressible printing element to the cylinder with at least one edge extending into the lock-up gap, trimming the edge extending into the lock-up gap,...     

A master sheet carrier which has a bar capable of holding the master sheet by clamping an end thereof, the bar being mounted on a mounting beam which is movable angularly and transversely with respect to the direction of movement of the master carrier, without requiring removal of the clamped master...     

An improved plate lockup mechanism for holding printing plates on a grooved plate cylinder, the mechanism having an elongated cam with an arcuate surface, a bar-like toggle including arcuate lower surfaces that mate with the surface of the cam and a securing member carried on the toggle for engaging...     

The present invention relates to a recording paper winding apparatus for winding a recording paper on a rotary drum, by providing a bar for pinching a front end of a recording paper between the bar and the outer surface of a rotary drum, whereon a recording paper is to be sucked by making inside a negative...     

In accordance with the invention, a plate-clamping mechanism is provided for clamping and locking flexible printing plates on a printing cylinder wherein a clamping jaw fitted into a cylinder cavity has a leading edge for clamping one end of printing plate which is (1) non-parallel to the cylinder's...     

A method of making-up offset printing cylinders having lock-ups positioned in gaps in the cylinders by use of a two piece system involving adhering a compressible printing element to the cylinder with at least one edge extending into the lock-up gap, trimming the edge extending into the lock-up gap,...     

A gravure printing machine cylinder has a means for mounting wrap-on gravure plates thereon using a tensioner able to be rocked about the shaft of the cylinder and having an outer cylindrical face in keeping with the outline of the cylinder in the printing condition. In order to be certain of a truly...     

To secure a thin, flexible printing plate (4) on the circumference of a plate cylinder (2, 20) by inserting the ends of the printing plate into two narrow parallel slits, the printing cylinder has a groove (3, 21) cut therein in which an insert strip (5, 23) is located which has an inner guide portion...     

To draw off electrostatic charges which build up on rubber blanket cylinders having a coating of insulating or semiconductive material thereon, the pad or underlay (4) beneath the rubber blanket (5) has an electrically conductive layer (6), for example by sprayed-on aluminum, applied thereon. The end...     

A recording system uses a laser beam for imaging the surface of a photographic film which is held in a curved arrangement to allow light to be focused in precise position in a circular light path on the film. The film is maintained in the curved arrangement by resilient means associated with a film holding...     

Transfer cylinder for conveying a sheet from one printing unit to another, comprising a cylindrical drum, a row of rubber suction pads for temporarily holding the sheet, the row of suction pads being disposed at an end of a sheet format length on the cylindrical surface of the drum, the rubber suction...     

A magnetic cylinder and plate for offset printing. The cylinder has annular magnets and pole pieces. The magnetic circuit is completed through a printing plate. The magnetic flux substantially saturates the pole pieces and plates. The area ratio of the pole pieces to the magnets is greater than about...     

The invention relates to a printing plate for offset printing comprising a number of printing patterns, having similar outer contours, which are located on the printing plate parallel to one another and adjoining one another but displaced in longitudinal direction in relation to one another. The printing...     

Apparatus for mounting a flexible printing plate comprises a printing cylinder having a surface upon which the printing plate is mountable, and a connection for applying subatmospheric pressure inside the cylinder. A plurality of valves selectively apply the subatmospheric pressure to the surface from...     

An improved makeready packing for preventing corrosion of cylinders of offset or lithographic printing presses which comprises providing a cylinder surface contacting packing element having a corrosion inhibitor applied thereto in such a manner that the inhibitor will effectively protect the entire surface...     

A printing plate clamping assembly is situated within a housing carried in a groove at the periphery of a plate cylinder. An adjusting shaft is supported for both rotation and translation by a plurality of spaced roller rings. A bearing support is carried by the adjusting shaft and receives a first end...     

Apparatus for mounting a flexible printing plate comprises a printing cylinder having a surface upon which the printing plate is mountable, and a connection for applying subatmospheric pressure inside the cylinder. A plurality of valves selectively apply the subatmospheric pressure to the surface from...     

A rotary printing press includes a printing plate mounted around a plate cylinder. The printing plate is in the form of a pair of semi-cylindrical resilient substrates. Each substrate is mounted to the printing plate by forming a multiple bend on the non-printing area of the leading edge of each substrate...     

Apparatus for clamping printing plates for rotary printing presses, having one or more clamping strips which are arranged so that they are laterally displaceable in a cylinder recess, which grip under an end region of the plate to be clamped and whose outer contour has a curvature corresponding to the...     

A replaceable cover for the cylindrical anvil of a rotary die cutter includes a blanket body of elastically deformable material, a sheet metal liner for the blanket body, and a latch assembly for securing the ends of the cover together in a slot in the face of the anvil roll. This latch assembly includes...     

A printing plate skewing assembly utilizes slidable coupling plates, carried in a groove on a plate cylinder. The coupling plates carry printing plate clamping and tensioning assemblies and are slidable through their connections to pivotable levers which are positioned at opposing ends of the plate cylinder...     

A flexible printing plate clamping assembly utilizes a circumferentially slidable support bar that has support edges which receive a leading edge of a printing plate. A camshaft is placed within a slot in the support bar such that rotation of the camshaft causes circumferential movement of the bar. Spring...     

A rotary die cutting cover for use on a die cutting cylinder, in which the cylinder has a cylindrical external surface and a recess slot extending the length of the cylindrical surface, the cover being formed of a mat of resilient, flexible material having integral increased thickness end portions which...     

A plate lockup for locking a plate on a rotary cylinder of a printing press in which a pair of deflectable springs carried by the rotary cylinder are deflectable by an actuator interposed between them. The actuator deflects one spring to facilitate lockup of a trailing end of a printing plate and then...     

A device and method for installing an adhesive-backed printing blanket on a cylinder is provided. The printing blanket has an adhesive backing for holding it on the cylinder and a leading edge substantially perpendicular to the edge of the blanket. The device comprises an angle bar having a generally...     

A flexible printing plate clamping assembly utilizes a printing plate clamping device disposed in a groove in a plate cylinder. A plurality of elbow lever assemblies are used to move a clamping bar between plate clamping and unclamping position. These elbow lever assemblies have pneumatic devices and...     

A plate clamping assembly for securing a printing plate to a plate cylinder of a rotary printing machine utilizes spaced clamping bars which are each pivotably positioned in a groove in the plate cylinder. An axially slidable and rotatable shaft cooperates with one of the clamping bars while an axially...     

In an apparatus for clamping printing plates for printing presses comprising two clamping strips which are displaceably arranged in a cylinder recess and held by two leaf springs and hook under an end region of the printing plate to be clamped and whose outer contours, in the clamped state, have a curvature...     

A printing cylinder having a longitudinal slot formed in the surface thereof to define at least one undercut surface against which both ends of a flexible printing plate are clamped to hold the plate securely against the surface of the cylinder. A plurality of individual cylinders is substantially evenly...     

A locking device for clamping plates, such as printing plates, in place includes a housing. A jaw is in the housing with a plurality of sets of clamp members mounted in the jaw. Each of the clamp members has rounded clamp surfaces. Spacers separate the sets of clamp members from each other. A fixed stop...     

To clamp a printing form (16), the end portions are inserted into a clamping groove (2, 3) which is formed by a channel (2) extending at an angle into the printing cylinder, and axially thereover. The channel 2 is enlarged interiorly of the plate cylinder 1 into an essentially cylindrical opening (3),...     

A carriage (1a) which supports a storage container (1) for holding a plurality of printing plates is movable in a path along the printing stations (101, 102, 103) of the rotary printing machine system; guide paths (4) extend parallel to the axes of rotation of plate cylinders (104 . . . 109) and plate...     

A replaceable cover for the cylindrical anvil of a rotary die cutter includes a blanket body of elastically deformable material, a sheet metal liner for the blanket body, and a latch assembly for securing the ends of the cover together in a lengthwise slot in the face of the anvil roll. This cover is...     

Locking means for a cutting die blanket including male and female locking elements that may be quickly engaged with minimal effort. A series of shoulders, located in the female section, are provided to engage a ledge on the male section. The locking means is closed by forcing the male section into the...     

A lock-up mechanism for use in securing a flexible printing plate 14 in a printing press, the flexible printing plate 14 having a leading edge 14 and a trailing edge 16. The lock-up mechanism has a plate cylinder 10 having a longitudinal groove 20 in an outer surface thereof and a lock-up body 22 contained...     

To distribute loading, and reduce wear, on filler inserts upon roll-off of printing machine cylinders formed with axial grooves, such as rubber blanket cylinders in offset printing machines, the filler insert is formed with an axially curved edge or surface (9, 10; 16, 18) which, either, is provided...     

For automating the placement or removal of printing plates on plate cylinders (16, 17) of rotary printing machines, particularly web printing machines, an application head (11) is secured to a multiple linked roboter arm (2), slidable vertically along a guide post (1). The roboter arm can be pivoted...     

A plate winding apparatus, includes a winding rod which is rotatably received in a first groove, bearing plates, plate holding springs, levers, and plate winding springs. The bearing plates have axial holes each having a diameter larger than that of each of both end portions of the winding rod and pivotally...     

An axially adjustable register pin assembly for axially shifting a printing plate on a plate cylinder of a rotary printing press is positioned on an insertion bar that is received in a cylinder. The shiftable register pin assembly utilizes an eccentric adjusting bolt and spaced fastening screws positioned...     

A clamping and tensioning device for clamping a printing plate on a cylinder of a printing machine includes a tensioning bar and a clamping bar having substantially radially extending, mutually opposing clamping surfaces for gripping therebetween a bent end of a printing plate, the tensioning bar being...     

A quick-action clamping device for fastening a printing plate on a plate cylinder in a printing machine by a fixed clamping bar and a displaceable clamping bar which are able to be brought into a clamping position and a plate-changing position, respectively, includes a spring device for resiliently pressing...     

An axially adjustable register pin for a plate cylinder of a rotary printing machine is positioned in a recess in an insertion bar that is carried in a cylinder gap on the periphery of the plate cylinder. The register pin is axially slidable and is held in a selected position by holding devices that...     

A cylinder blanket fastening assembly utilizes a resilient clamping bar that is secured to a channel edge of a cylinder and generally adjacent a tensioning shaft carried in a channel in the cylinder. A leading edge of an inner blanket is positionable between a clamping edge of the clamping bar and the...     

A pressure fluid supply valve assembly is supported by a cylindrical sleeve that is concentric with an axle journal of a printing unit cylinder. A fluid under pressure is supplied to a generally tubular or cylindrical housing and causes a movable valve member to move into contact with the axle journal....     

An inner blanket securement assembly utilizes spaced inner blanket engaging pins and an inner blanket hold-down device with a hook-shaped holding nose to secure an edge of an inner blanket to a cylinder. The inner blanket is structured using a plurality of inner layers within an outer casing that is...