US3985074A — Offset printing machines

Claim 1

Independent Claim 365 words

An offset printing machine comprising: a master cylinder adapted to hold a master; a blanket cylinder adapted to hold a blanket; an impression cylinder adapted to hold a sheet of paper for receipt of an impression transferred thereto from a master on the master cylinder by a blanket on the blanket cylinder; at least two grippers for gripping the forward edge of a sheet of paper between the blanket on the blanket cylinder and the impression cylinder at each appropriate instant in each cycle of operation of the machine; a rigid mounting member having said at least two grippers mounted thereon; means mounting the mounting member on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the paper cylinder is rotating, to adjust the position of the impression provided by the blanket in the direction of motion of the paper around the impression cylinder; adjusting means for moving the mounting member circumferentially and retaining the mounting member in a fixed circumferential position with respect to the impression cylinder, the adjusting means being actuable while the impression cylinder is rotating; a pair of rollers defining a pinch through which each sheet of paper is introduced into said at least two grippers; a first lever mounting one of the rollers; a cam follower secured to the first lever; a circular wheel with a cam depression for moving said first lever to open and close the pinch of the pair of rollers; means for driving the circular wheel in synchronism with the impression cylinder; means mounting the cam follower roller for movement in a direction substantially circumferential of the circular wheel; a second lever connected to the cam follower roller for moving the cam follower roller substantially circumferential of the circular wheel; and means connecting said second lever with said adjusting means; whereby movement of said at least two grippers circumferentially of the impression cylinder causes a corresponding movement of the cam follower roller substantially in the direction of feed of the paper sheets and the leading edge of each paper sheet is adjusted as the position of the grippers is adjusted.

Claim 2

Dependent Claim 365 words

An offset printing machine comprising: a master cylinder adapted to hold a master; a blanket cylinder adapted to hold a blanket; an impression cylinder adapted to hold a sheet of paper for receipt of an impression transferred thereto from a master on the master cylinder by a blanket on the blanket cylinder; at least two grippers for gripping the forward edge of a sheet of paper between the blanket on the blanket cylinder and the impression cylinder at each appropriate instant in each cycle of operation of the machine; a rigid mounting member having said at least two grippers mounted thereon; means mounting the mounting member on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the paper cylinder is rotating, to adjust the position of the impression provided by the blanket in the direction of motion of the paper around the impression cylinder; adjusting means for moving the mounting member circumferentially and retaining the mounting member in a fixed circumferential position with respect to the impression cylinder, the adjusting means being actuable while the impression cylinder is rotating; a pair of rollers defining a pinch through which each sheet of paper is introduced into said at least two grippers; a first lever mounting one of the rollers; a cam follower secured to the first lever; a circular wheel with a cam depression for moving said first lever to open and close the pinch of the pair of rollers; means for driving the circular wheel in synchronism with the impression cylinder; means mounting the cam follower roller for movement in a direction substantially circumferential of the circular wheel; a second lever connected to the cam follower roller for moving the cam follower roller substantially circumferential of the circular wheel; and means connecting said second lever with said adjusting means; whereby movement of said at least two grippers circumferentially of the impression cylinder causes a corresponding movement of the cam follower roller substantially in the direction of feed of the paper sheets and the leading edge of each paper sheet is adjusted as the position of the grippers is adjusted.

Claim 3

Dependent Claim 276 words

An offset printing machine comprising: a master cylinder adapted to hold a master; a blanket cylinder adapted to hold a blanket; an impression cylinder adapted to hold a sheet of paper for receipt of an impression transferred thereto from a master on the master cylinder by a blanket on the blanket cylinder; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper between the blanket on the blanket cylinder and the impression cylinder at each appropriate instant in each cycle of operation of the machine; a frame for supporting said at least two grippers; means for mounting the frame on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the impression cylinder is rotating, to adjust the position of the impression provided by the blanket in the direction of motion of the paper around the impression cylinder; means for mounting at least one spring for biasing the frame in one direction; a bar mounted for slidable movement in a longitudinal direction of the impression cylinder; a non-rotatable plate adjacent one end of the impression cylinder, said bar engaging said plate; a cam mounted on the bar; a cam follower on said frame for co-acting with said cam and moving said frame against the action of said at least one spring; and means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder to change the longitudinal position of the bar and in consequence the circumferential position of said at least two grippers relative to the impression cylinder.

Claim 4

Dependent Claim 276 words

An offset printing machine comprising: a master cylinder adapted to hold a master; a blanket cylinder adapted to hold a blanket; an impression cylinder adapted to hold a sheet of paper for receipt of an impression transferred thereto from a master on the master cylinder by a blanket on the blanket cylinder; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper between the blanket on the blanket cylinder and the impression cylinder at each appropriate instant in each cycle of operation of the machine; a frame for supporting said at least two grippers; means for mounting the frame on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the impression cylinder is rotating, to adjust the position of the impression provided by the blanket in the direction of motion of the paper around the impression cylinder; means for mounting at least one spring for biasing the frame in one direction; a bar mounted for slidable movement in a longitudinal direction of the impression cylinder; a non-rotatable plate adjacent one end of the impression cylinder, said bar engaging said plate; a cam mounted on the bar; a cam follower on said frame for co-acting with said cam and moving said frame against the action of said at least one spring; and means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder to change the longitudinal position of the bar and in consequence the circumferential position of said at least two grippers relative to the impression cylinder.

Claim 5

Dependent Claim 137 words

An offset printing machine as claimed in claim 2, and comprising end plates mounting the cylinders of the machine for rotation, a plurality of pins mounting the non-rotatable plate for movement towards and away from the impression cylinder, the pins passing through bores in one of the end plates, at least one spring urging the non-rotatable plate towards the end plate to move the grippers in one circumferential direction, a U-shaped member comprising arms and base forming a U, the U-shaped member being pivoted about the base of the U for applying pressure on the pins and thereby moving the non-rotatable plate towards the impression cylinder, lever secured to the base of the U, and a manual adjustment screw for adjusting the position of the lever and thereby the circumferential position of said at least two grippers.

Claim 6

Dependent Claim 110 words

An offset printing machine as claimed in claim 2, and comprising a bar to which said at least two grippers are attached, means mounting the bar on the frame for rotation about the axis of the bar, means associated with the bar and gripper for opening and closing the grippers upon rotation of the bar, a pinion at one end of the bar, a sector gear mounted on the end of the impression cylinder for pivotal movement, an acutating member for pivoting the sector gear, a stationary cam mounted upon the adjacent end plate of the machine, and a cam follower engaging the cam and mounted on the actuating member.

Claim 7

Dependent Claim 196 words

An offset printing machine as claimed in claim 3, and further including a pair of rollers defining a pinch through which each sheet of paper is introduced into said at least two grippers, a pivoted lever mounting one of the rollers, a cam follower connected to the lever, a rotary circular wheel with a cam depression for pivoting the lever to open and close the pinch of the pair of rollers, means for driving the circular wheel in synchronism with the impression cylinder, means mounting the cam follower roller for movement in a direction substantially circumferential of the circular wheel, a lever connected to the cam follower roller for moving the cam follower roller substantially circumferential of the circular wheel, a lever attached to the base of the U-shaped member, and means connecting the lever connected to the cam follower roller to the lever attached to the base of the U-shaped member, whereby movement of the grippers circumferentially of the cam follower roller substantially in the direction of feed of the paper sheets and the leading edge of each paper sheet is adjusted as the position of the grippers is altered by adjusting the adjustment screw.

Claim 8

Dependent Claim 48 words

An offset printing machine as claimed in claim 2, in which there are two said cam mounted on the bar, each of which is defined by cam-shaped brackets on the bar, and there are two respective said cam follower members, each of which is a cam follower roller.

Claim 9

Dependent Claim 63 words

An offset printing machine as claimed in claim 2, and comprising a pair of compression springs, one end of each of which is housed in a recess in one member of the frame while the other end of each spring is housed in a recess in a projection from the impression cylinder, the compression springs biasing the cam follower member against the cam.

Claim 10

Dependent Claim 343 words

A rotary printing machine comprising: an impression cylinder adapted to hold a sheet of paper; impression transferring means for holding a master and for transferring an impression from the master to the sheet of paper; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper onto the impression cylinder at each appropriate instant in each cycle of operation of the machine; a rigid mounting member having said at least two grippers mounted thereon; means mounting the mounting member on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and impression cylinder while the paper cylinder is rotating, to adjust the position of the impression on the paper in the direction of motion of the paper around the impression cylinder; adjusting means for moving the mounting member circumferentially and retaining the mounting member in a fixed circumferential position with respect to the impression cylinder, the adjusting means being actuable while the impression cylinder is rotating; a pair of rollers defining a pinch through which each sheet of paper is introduced into said at least two grippers; a first lever mounting one of the rollers; a cam follower secured to the first lever; a circular wheel with a cam depression for moving said first lever to open and close the pinch of the pair of rollers; means for driving the circular wheel in synchronism with the impression cylinder; means mounting the cam follower roller for movement in a direction substantially circumferential of the circular wheel; a second lever connected to the cam follower roller for moving the camm follower roller substantially circumferential of the circular wheel; and means connecting said second lever with said adjusting means; whereby movement of said at least two grippers circumferentially of the impression cylinder causes a corresponding movement of the cam follower roller substantially in the direction of feed of the paper sheets and the leading edge of each paper sheet is adjusted as the position of the grippers is adjusted.

Claim 11

Dependent Claim 343 words

A rotary printing machine comprising: an impression cylinder adapted to hold a sheet of paper; impression transferring means for holding a master and for transferring an impression from the master to the sheet of paper; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper onto the impression cylinder at each appropriate instant in each cycle of operation of the machine; a rigid mounting member having said at least two grippers mounted thereon; means mounting the mounting member on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and impression cylinder while the paper cylinder is rotating, to adjust the position of the impression on the paper in the direction of motion of the paper around the impression cylinder; adjusting means for moving the mounting member circumferentially and retaining the mounting member in a fixed circumferential position with respect to the impression cylinder, the adjusting means being actuable while the impression cylinder is rotating; a pair of rollers defining a pinch through which each sheet of paper is introduced into said at least two grippers; a first lever mounting one of the rollers; a cam follower secured to the first lever; a circular wheel with a cam depression for moving said first lever to open and close the pinch of the pair of rollers; means for driving the circular wheel in synchronism with the impression cylinder; means mounting the cam follower roller for movement in a direction substantially circumferential of the circular wheel; a second lever connected to the cam follower roller for moving the camm follower roller substantially circumferential of the circular wheel; and means connecting said second lever with said adjusting means; whereby movement of said at least two grippers circumferentially of the impression cylinder causes a corresponding movement of the cam follower roller substantially in the direction of feed of the paper sheets and the leading edge of each paper sheet is adjusted as the position of the grippers is adjusted.

Claim 12

Dependent Claim 251 words

A rotary printing machine comprising: an impression cylinder adapted to hold a sheet of paper; impression transferring means for holding a master and for transferring an impression from the master to the sheet of paper; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper onto the impression cylinder at each appropriate instant in each cycle of operation of the machine; a frame for supporting said at least two grippers; means for mounting the frame on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the impression cylinder is rotating, to adjust the position of the impression on the paper in the direction of motion of the paper around the impression cylinder; means for mounting at least one spring for biasing the frame in one direction; a bar mounted for slidable movement in a longitudinal direction of the impression cylinder; a non-rotatable plate adjacent one end of the impression cylinder, said bar engaging said plate; a cam mounted on the bar; a cam follower on said frame for co-acting with said cam and moving said frame against the action of said at least one spring; and means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder to change the longitudinal position of the bar and in consequence the circumferential position of said at least two grippers relative to the impression cylinder.

Claim 13

Dependent Claim 251 words

A rotary printing machine comprising: an impression cylinder adapted to hold a sheet of paper; impression transferring means for holding a master and for transferring an impression from the master to the sheet of paper; at least two grippers for gripping the forward edge of a sheet of paper for drawing the paper onto the impression cylinder at each appropriate instant in each cycle of operation of the machine; a frame for supporting said at least two grippers; means for mounting the frame on the impression cylinder for movement circumferentially of the impression cylinder to vary the relative position of the sheet of paper and the impression cylinder while the impression cylinder is rotating, to adjust the position of the impression on the paper in the direction of motion of the paper around the impression cylinder; means for mounting at least one spring for biasing the frame in one direction; a bar mounted for slidable movement in a longitudinal direction of the impression cylinder; a non-rotatable plate adjacent one end of the impression cylinder, said bar engaging said plate; a cam mounted on the bar; a cam follower on said frame for co-acting with said cam and moving said frame against the action of said at least one spring; and means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder to change the longitudinal position of the bar and in consequence the circumferential position of said at least two grippers relative to the impression cylinder.

Claim 14

Dependent Claim 84 words

A printing machine as claimed in claim 9, wherein the means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder comprises an adjustment member, means mounting the adjustment member for pivotal motion about an axis in a plane normal to the axis of the impression cylinder, and means operatively connecting the adjustment member to the non-rotatable plate, whereby pivotal motion of the adjustment member adjusts the distance of the non-rotatable plate from the end of the impression cylinder.

Claim 15

Dependent Claim 74 words

A printing machine as claimed in claim 10, wherein the impression cylinder is mounted for rotation upon spaced end plates of the machine, and comprising a plurality of pins passing through bores defined in one of the end plates and mounting said non-rotatable plate for movement towards and away from the impression cylinder, the adjustment member comprising a member having a base and a plurality of arms projecting therefrom, the arms engaging the pins.

Claim 16

Dependent Claim 125 words

A printing machine as claimed in claim 9, and comprising a feed device for introducing each sheet of paper into the grippers, and means connecting the feed device to the means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder, whereby the circumferential position of the leading end of the paper is adjusted as the circumferential position of the grippers is adjusted, the feed device comprising a pair of rollers between the pinch of which each sheet of paper is introduced into the grippers, and means for adjusting the time in the cycle at which the rollers act on the paper to feed it into the grippers, to adjust the circumferential position of the leading end of the paper.

Claim 17

Dependent Claim 163 words

A printing machine as claimed in claim 9, and wherein the means for adjusting the distance of said non-rotatable plate from the end of the impression cylinder comprises an adjustment member, means mounting the adjustment member for pivotal motion about an axis in a plane normal to the axis of the impression cylinder, and means operatively connecting the adjustment member to the non-rotatable plate, whereby pivotal motion of the adjustment member adjusts the distance of the non-rotatable plate from the end of the impression cylinder, the printing machine further comprising a feed device for introducing each sheet of paper into the grippers, means for adjusting the circumferential position of the leading edge of the paper fed by the feed device to the grippers, and connecting means connecting the latter adjusting means to the pivotally mounted adjustment member, whereby the circumferential position of the leading edge of the paper is adjusted by the feed device as the circumferential position of the grippers is adjusted.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-10-12	1980-04-12	1980-10-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-10-12	1984-04-12	1984-10-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-10-12	1988-04-12	1988-10-12	$7700.00	Window Closed / Lapsed

Offset printing machines

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag