摘要:
A cam mechanism for periodically swiveling a swivel device includes a rotatable first cam disk carrying a first cam serving as a main cam, a rotatable second cam disk carrying a second cam serving as an auxiliary cam, a first roller engaging the first cam under spring force and rollable on the first cam during rotation of the first cam disk, a second roller engaging the second cam under spring force and rollable on the second cam during rotation of the second cam disk, and a lever arrangement swivelable by the two rollers and having at least one spring for providing the spring force, including a swivel lever swivelable about a swivel axis and carrying the first roller, a swiveling movement corresponding to the first cam being impresable by the swivel lever upon the swivel device, the swivel axis and the two rollers having axes of rotation extending parallel to one another, and normals to the axes of rotation of the two rollers intersecting one another on the axis of rotation of the swivel axis and forming and angle .alpha. which is a measure for the spring force under which the two rollers engage the two cams, the auxiliary cam having a contour for varying the angle .alpha. as a function of inertial forces resulting, respectively, from accelerations and decelerations of the lever arrangement and of machine parts connected therewith during rotation of the two cam disks.
摘要:
A sheet transfer device for a printing machine for taking over sheets which have been aligned at front lays and for transferring the sheets to a sheet-guiding drum includes a pregripper device swivellable between a sheet takeover and a sheet transfer position. Gripper pads are carried by the pregripper device, and a gripper shaft is swivel-mounted in the pregripper device and carries gripper fingers which are associated with the gripper pads. Also provided are a device for connecting the gripper shaft and the gripper fingers so that swivelling movements of the gripper shaft are transmitted to the gripper fingers, and a swivel device for swivelling the gripper shaft about a longitudinal axis thereof. A cam segment has a control surface for controlling the swivel device, and is adjustable so that a gap, formed between the gripper fingers and the gripper pads in the takeover position of the pregripper device and existing until alignment of the sheet at the front lays is terminated, is settable in accordance with the thickness of the sheets. The gap is so defined that the gripper fingers form top lays for a respective leading sheet edge. A control shaft is provided for adjusting the cam segment, the control shaft extending parallel to generatrices of the control surfaces and being arranged so as to be adjustable parallel to itself.
摘要:
Transmission system for forming cyclical motion from rotational motion including a device having a rotating part and at least one control lever set into cyclical motion by rotational motion of the rotating part, the one control lever and the rotating part being in cooperative engagement whereby a varying force is applied to the control lever producing a torque fluctuation in the rotational motion, includes another device for producing cyclical motion, the other device being in operative engagement with the rotating part, and spring means for applying a force to the rotating part so as to compensate for the torque fluctuation.
摘要:
Device for skewed sheet correction in a feeder of a sheet-fed printing press having at least one sucker which is adjustable in height and is disposed on a driven movable sucker carrier for horizontally transporting and simultaneously aligning a sheet lifted from a sheet pile, a rocker arm mounted in a frame of the printing press, the sucker carrier being articulatingly connected to the rocker arm so as to be movable in a feeding direction of the sheet and swingably driven, and a cam guide which is adjustable in height, the sucker carrier being braced against the cam guide, includes another rocker arm adjustably supported in the press frame, the sucker carrier being spaced apart from the first-mentioned rocker arm in a direction transverse to the sheet feeding direction and being articulatingly connected to the other rocker arm.
摘要:
A method and an apparatus for displacing at least one roller of an offset rotary printing press. An arrangement is provided for affording the displaceability of at least one roller in a highly versatile and adaptable manner. Displacement of the at least one roller in question can be undertaken in such a manner as to markedly facilitate the operation of a printing press.
摘要:
Cam-oscillating drive which operates to compensate for the cyclically occurring variations in the course of the drive moment by means of at least one cam disc mounted on the drive shaft and a rolling cam follower in engagement with the cam disc, wherein the cam follower has an oscillating part with an oscillating mass driven by the cam follower, and wherein the oscillating part has a curved section that cooperates with a curve roller and a potential energy storage such that the kinetic energy of the oscillating part is stored in the potential energy storage during the deceleration phase, while during the acceleration phase the energy is again drawn from the potential energy storage.
摘要:
A method of releasing a sheet from a blanket cylinder of a printing machine, wherein the sheet is guided by an impression cylinder and held by grippers thereof, includes moving, with respect to the impression cylinder, elements of the impression cylinder holding the sheet, in a direction relatively counter to the direction of rotation of the impression cylinder, so as to produce an enlarged pull-off angle after a leading edge of the sheet has passed a printing nip between the blanket and the impression cylinders; and a device for performing the foregoing method. The background to the invention is the knowledge that higher tensile forces on a sheet are disadvantageous, and the object was therefore set of making available a method and a device in which the tensile force is reduced. This is achieved by means of a method in which, in order to produce an enlarged pull-off angle (.gamma.) after the leading edge of the sheet (1) has passed the press nip (6), the elements (5,5',5",5"') of the impression cylinder (4) which hold the sheet (1) are moved in relation to the impression cylinder (4), relatively counter to its direction of rotation (15). Furthermore, the object is achieved by means of a device in which the elements (5,5',5",5"') holding the sheet (1) are configured so as to be correspondingly movable.
摘要:
Gripper control device in a chain delivery of a sheet-fed printing press, wherein a cam segment has a control cam for a control roller provided on a gripper system and is adjustably disposed for opening a gripper of the gripper system as a sheet is delivered, the control cam being formed with a rectilinear on-running region aligned for rectilinear movement of the control roller in a given direction, includes an adjusting element operatively engageable with the cam segment for effecting a phase displacement of the gripper between a closed and an open condition thereof, the control cam of the cam segment, in an inactive basic position thereof, being aligned, with the on-running region thereof parallel to the given direction of rectilinear movement of the control roller for the gripper system, in an imaginary plane tangent to the control roller at a location on the circumference thereof most distal from the gripper of the gripper system, and a cam roller rotatably mounted on the cam segment, the adjusting element having a rotatably mounted control cam in operative engagement with the rotatably mounted cam roller.
摘要:
Printing unit for rotary printing presses having at least one printing unit and at least one ink-conduction cylinder comprising an engageable and disengageable ink-reducing unit assigned to one of the ink-conducting cylinders and having at least one roller, a doctor blade engageable with the one roller and an ink-collection trough, the one roller, while printing is stopped but while ink is being supplied, being in engagement with the ink-conducting cylinder for removing from the ink-conducting cylinder substantially a like portion of ink film which would otherwise be removed by paper being printed in the printing unit.
摘要:
Continuously rotatable advance gripper drum assembly for sheet-fed rotary printing machines having an advance gripper drum and a gripper bridge movable relative to the drum includes a crank-driven linkage transmission device disposed on and rotatable with the drum and operatively connected to the gripper bridge for moving the gripper bridge.