US2899202A

US2899202A - Rttorneys

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Publication number: US2899202A
Authority: US
Publication date: 1959-08-11
Anticipated expiration: 1976-08-11

Description

Aug. 11, 1959 I .YMEsTRE 2,899,202

oFFsET PRINTING MACHINE AND SHEET GAGE Original Filed Sept. 2, 1953 E521 "gk-r4 INVENTQR. Lu/s l/Wz-:sT/w

i H 7 TORNEYS @ZE/MMM States Patented Aug. 11, 1959 ice opment Corporation,-New Yorin-NX.,I al corporation of NewYork Original application September- 2,""1953,` Serial"'No. 378,035, n'ow Patent""No. 2,821,911gj`d'ated February 4, 1958. Divided ndithis' application May 16',19'57,

Serial No. 659,595

- 8 Claims. (Cl. 271--53) The present invention relates toy offset printing machines and the principal object ofthe invention is-to provide a gageor stop `means 'embodying novel and advantageous features of construction `and-oapablerof producing novel and advantageous resultsfHPrinting -machinesV of this character comprise a platecylindcr, a

` blanket cylinder, and an impressioncylinder-and may include a delivery cylinder. The gageor stop` means is located at or adjacent to the impression cylinder-to stop the sheet and control the position'ofnthefleadingedge of the sheet at the cylinder.

An object of the invention is to provide a machine of the type specified embodyingV novel and advantageous upon consideration of the following .detailed description and of the drawings, in which:

Fig. 1 is a sectional view throughwan impression cylinder taken on line 1 1 of Fig. 2; giving an elevational view of the gage or stop means.

Fig. 2 is a partial end View ofrth'e impression cylinder and the gage or stop means.

Fig. 3 is a vertical section through theA impression cylinder and the gage or stop means taken on line 3 3 of Fig. 1, the impression cylinder being in position formeans carried thereby to grip the leadingedge of a sheet of paper fed thereto;

Fig. 4 is a detail end view of a cam follower for the gage adjustment as taken on line 4 4 of Fig. 1.

Fig. 5 is a side view of the cam follower as viewed on line 5 of Fig. 2.

Fig. 6 is a cross section through a rockshaft for the gage adjustment taken on line 6 6 of Fig. l.

The frame of the machine comprises spaced front and rear frame members or

plates

40 and 41 respectively, connected by crossipieces, (not shown). The cylinders and gage parts are mounted upon the frame members. Each sheet of paper P is picked from a pile or stack (not shown) and advanced to the impression cylinder-66 of the offset printing machine by ysuitable feeding mechanism (not shown). The impression rcylinder is rotatably mounted on a shaft 49 and driven by agear'50. A blanket cylinder 48 carriesthe ink for making an impression'on the sheet as it passes between -theimpression cylinder and the blanket cylinder.

" The sheet P from the feedingimechanism'passeswover a lower supportingplate'l'57-and fbeneathanvupper guide plate`58 to aposition where it is stopped-by engagement ofvitsl' leading edge-with substantially vertical `stop fingers or teeth 59 of a gage member or comb 60 forming apart 'of thegage` or stop. Thelower endsloflthefstop-fngers 59 are normally 'housed in slots 62 in the end edge of the plate S8 which extends beyond the edge of plate`57. In the position illustrated :the stop lingers` project below:the lower face of -plate 58 into the .path offeaclrlshee't P. =The comb or gage membert) khas afiat top `63 adjustably mounted on the top' of a rockshaft 64 andf provided `atiits forward edge -with'l-the ngers 59A which. project'A downwardly at substantially vright `angles to the top. 'f The stop ugers y59-v occupy :alternate slots .62 in plate-58 leaving `the remaining slots *.62 available for thepassage offspring *grippers4 ori 'gripper finger'sS .carried r by an :impression cylinder166having ends-66a. As shown in Fig. 1i, the

stop fingers '59 are 'separatedfbyhigh arched openings to accommodate or permit the sheet 'grippersor gripper iinge1s65 to passftherebetween.

"f1-Fixed tothe impression cylinder-66` is a cam` 671h'aving-an outerledge or highpor-tion-in the shapeof a. circle -on thev rocksh'afti64 Landi-moves' the stop fingersy or teeth has been clamped .by'v thev "grippers' 65 i of r impression'v cyl- 3d inder166-and...holdstheistop:raiseduntill just'prior to another sheetapproaching stop position. I v'The follower 5269 then'- dropsv-intohthe lower part 68 of -theicam and pivots the-stopfingers59winto sheet stopping position, for engagement of the leading'edge of the-sheet withlthe impression cylinder i566.. The follower-'69 is f pressed other' endwa'ttached to afixedpin Sii-carried by a .frame plate '(Fig. v5).

yA feature off-Itheinvention `relates tolnovel and advantageous means "for adjus'tably mounting: the gage or about the pivot formed by the screw 71.

The actual adjustment of alignment of the comb or gage member 60 is effected by .means of a nut 74 threaded on the rockshaft`64an'd having a tapered orconical'end engaging a finger '75' projecting from the adjacentend of said comb 60 forengagement by the tapered end of the nut 74." lBy screwing the` nut 74 towards `the pivot.71, the end of the stop, gage or comb 60 at the nut 74 will be moved away from the rockshaft 64 in the direction `of travel of the sheets and the other end of said stop or -comb at the spring will be swung about the pivot 71 towards the rockshaft andagainst resistance ofsaid spring 72. By movement of nut 74 in the proper direction the comb 60 may be adjusted to provide proper alignment of the gage for the leading edge of the sheets P as the sheets are fed to the impression cylinder 66.

Another feature of the invention relates to regulation of the movement of the stop or comb 60 about the axis of rockshaft 64 by adjusting the position of arm 70 around said rockshaft, thereby regulating the forward or rearward position of the stop 60 and of the ends of stop fingers or teeth 59. As illustrated in Figs. 4 and 5, arm 70 is flat and has a hub 76 at its inner end mounted on the rockshaft y64 and fixed to a collar 77l rotatably mounted on the same rockshaft. At one side of hub 76 is a projection 78 having at its lower edge an ear 79 at right angles thereto and having a screw-threaded opening therein.

Adjacent to hub 76 is a hub 80 mounted on rockshaft 64 and secured to a collar 81 which is fixed on rockshaft 64 by a screw 85. The hub 80 has an ear 82 projecting laterally over ear 79 and having an opening therethrough to receive a bolt of screw 83. The screw 83 is inserted through the opening in ear 82, through a helical spring 84, and is screwed into the screw-threaded opening in ear 79. The helical spring 84

urges ears

79 and 82 apart to the distance permitted by screw 83. The adjustment of the arm 70 with reference to rockshaft 64 may be varied within suitable limits of adjustment by turning screw 83 to the required position `and thereby adjusting the position of the stop fingers on teeth 59 forwardly or rearwardly of the travel of the sheet or relatively to the impression cylinder.

The surface of the impression cylinder 66 is cylindrical except for a longitudinal channel or trough 90 having a peripherial opening to accommodate the gripper fingers 65 and a shaft 91 on which they are pivotally mounted. The shaft 91 is mounted in the ends 66a of impression cylinder 66. As shown on Fig. l, fingers 65 are spaced to pass through slots 92 in a cover 93 for said channel 90. Other slots 89 in the cover receiving the fingers 59 of stop 60 at the time the stop is lowered or pivoted to stop position. Suitable operating means 87 are provided to open and close the gripper fingers 65 in timed relation with the rotation of the impression cylinder. A suitable means is shown in the aforesaid parent patent.

This invention is presented to fill a need for improvements in Offset Printing Machine and Sheet Gage. It is understood that various modifications in structure, as well as changes in mode of operation, assembly and Vmanner of use, may and often do occur to those skilled in the art, especially after benefitting from the teachings of an invention. Hence it will be understood that this disclosure is illustrative of preferred means of embodying the invention in useful form by explaining the construction, operation and advantages thereof.

What is claimed is:

l. In a machine of the class specified to make impressions on successive sheets, the combination of a frame, a cylinder mounted for rotation in the frame and having a longitudinal opening, means at said opening to grip the leading edge of a sheet presented at said opening at a predetermined point in the rotation of said cylinder, and asingle gaging member of a substantial length for the leading edge of each sheet mounted on the frame adjacent to the cylinder, means to move the gaging member into and away from the path of movement of a sheet to the cylinder, comprising means for adjusting said gaging member in accordance with the transverse direction of the leading edge of a sheet.

2. In a machine of the class specified to make impressions on successive sheets, the combination of a frame, a cylinder mounted for rotation in the frame and having a longitudinal opening, means at said opening to grip the leading edge of a sheet presented at said opening at a predetermined point in the rotation of said cylinder, and gaging means for the leading edge of each sheet mounted on the frame adjacent to the cylinder, means to move the gaging means into and away from the path of movement of a sheet to the cylinder, comprising means for adjusting the relative position of the gaging means with respect to the cylinder.

3. In a machine of the class specified to make impressions on successive sheets, the combination of a frame, a cylinder mounted for rotation in the frame and having a longitudinal opening, means at said opening to grip the leading edge of a sheet presented at said opening at a predetermined point in the rotation of said cylinder, and gaging means for the leading edge of each sheet mounted adjacent to the cylinder comprising a transverse shaft mounted on the frame, a gage member having a top resting on said shaft Aand pivoted centrally thereon and fingers projecting downwardly to engage the leading edge of said sheet, and means to rock the shaft to move the fingers into and away from the path of movement of a sheet to the cylinder.

4. In a machine of the class specified to make impressions on successive sheets, the combination of a frame, a cylinder mounted `for rotation in the frame and having a longitudinal opening, means at the opening to grip the leading edge of a sheet presented at said opening at a predetermined point in the rotation of said cylinder, and gaging means for the leading edge of each sheet mounted adjacent to the cylinder comprising a transverse shaft mounted on the frame, a gage member having a top resting on the shaft and pivoted centrally thereon and fingers projecting downwardly to engage the leading edge of a sheet, and means to rock the shaft to move the fingers into and away from the path of movement of a sheet to the cylinder, means for urging one end of said gage to swing it about its pivot, and positive means for swinging the gage against such urging means.

V5. In a machine of the class specified to make impressions on successive sheets, the combination of a frame, a cylinder mounted for rotation in the frame and having a longitudinal opening, means at said opening to grip the leading edge of a sheet presented at said opening at a predetermined point in the rotation of said cylinder, and gaging means for the leading edge of each sheet mounted adjacent to the cylinder comprising a transverse rockshaft mounted on the frame, aligned stop fingers carried by said rockshaft, and means for raising and lowering said stop fingers comprising an arm connected at one end to the shaft, a cam on the cylinder engaged by the arm and which cam has a low and high portion to move the stop fingers into and away from the path of feed of a sheet to the cylinder.

6. In a machine of the class specified, the combination of a cylinder having means to grip the leading edge of a sheet supplied thereto, and means for gaging the forward edge of each sheet preparatory to the action of said gripping means and mounted adjacent to the cylinder comprising a rockshaft, gaging fingers extending downwardly at the forward side of said rockshaft, a cam mounted on said cylinder, an arm mounted at its inner end on said rockshaft, a follower at the other end of the arm to engage said cam, a screw and means controlled by the screw to adjust the position of the arm with reference to the rockshaft and hold such adjustment.

7. In a machine of the class specified, the combination of a cylinder having means to grip the leading edge of a sheet supplied thereto, and means for gaging the forward edge of each sheet preparatory to the action of said gripping means and mounted adjacent to the cylinder comprisinga rockshaft, gaging fingers extending downwardly at the forward side of the rockshaft, a cam mounted on the cylinder, an arm mounted at its inner end on said rockshaft, a follower at the other end of the arm to engage said cam, a member fixed on the shaft adjacent said arm, a helical compression spring interposed between the member and the arm to change their relative positions around the shaft, means for compressing the spring comprising a rod extending through the spring and threaded at one end, and a nut on the threaded end.

8. In a machine of the class specified, the combination of a cylinder with gripping means to grasp the leading edge of a sheet fed thereto, a gaging means comprising a shaft, a stop comprising a top overlying said shaft, a 'vertical pivot projecting from the top of the shaft through the central part of the top, a comb projecting from said top downwardly at the front of the shaft and having a plurality of lingers, a helical spring having one end in a corresponding bore in the shaft spaced from the vertical pivot and engaging the inner surface of one end of the comb, and a conical nut threaded on the shaft at the other References Cited in the le of this patent UNITED STATES PATENTS Marguardt Oct. 19, 1926 Albrecht June 30, 1953 Pitner Aug. 31, 1954