US2531253A

US2531253A - Attachment for presses

Info

Publication number: US2531253A
Application number: US721408A
Authority: US
Inventors: Jr Norman F Carden
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-01-10
Filing date: 1947-01-10
Publication date: 1950-11-21
Anticipated expiration: 1967-11-21

Description

Nov. 21, 1950 N. F. GARDEN, JR

ATTACHMENT FOR PRESSES Filed Jan. 10, 1947 gwuc/Mo v Norman E Garden Jr.

Patented Nov. 21, 1950 UNITED. STATES PATENT OFFICE" ATTACHMENT FOR PRESSES Norman F. Garden, Jr., Durham, N. C.

Application January 10, 1947, Serial No. 721,408

2 Claims.

This invention relates to the paper ejecting mechanisms of presses and more particularly to an attachment for applying an adjustable pressure to the material ejecting rollers of a conventional Multilith press.

Printing machines of the type mentioned are usually provided With a driven paper ejecting roll and the printed sheets are held against the surface of the ejecting roll by means of pivotally supported rollers which bear by gravity against the upper surface of the paper sheets. Where the rollers bear against the surface of the paper by their weight only, the ejection of printed sheet material from the press isoften impositive and irregular, particularly where there may be variation in the weight and texture of the paper used.

It is an object of this invention to provide an attachment for printing machines which will exert an adjustable pressure for urging rollers against the surface of paper on a driven ejecting roll.

It is another object of this invention to provide an attachment easily applied to Multilith presses for assuring proper action of the paper ejectin mechanism.

It is still another object of this invention to provide an attachment for the roller supports of paper ejecting mechanisms which applies an adjustable spring pressure effective to urge the rollers to firmly hold paper in contact with a driven ejector roll.

Other objects and advantages of this invention will become readily apparent from the followin detailed description of the preferred embodiment of the invention shown in the accompanying drawing, wherein,

Figure 1 is a perspective view of the paper ejecting portion of a Multilith press machine having pressure attachments applied to the roller supports thereof.

Figure 2 is an enlarged perspective view of a portion of the apparatus shown in Figure 1.

Figure 3 is an elevation view of the attachment shown in Figures 1 and 2 removed from the printing machine.

Referring to the drawings, which for the purposes of illustration show a preferred embodiment of the invention, portions of the side plate members of a conventional Multilith press are designated by the numerals I and H. The side plate members are connected by a rigid horizontal tie bar l2. The ejector roll I3 is journaled in the side plates Ill and II and is provided with a drivin gear, not shown, for positively rotating the roll. A bar l4 extends between the side plates i0 and I l and is provided with paper strippers 15 for removing the printed sheets from the impression cylinder I 6.

Conventional structure for holding the printed sheet material against the driven ejector roll I3 includes a pair of rollers i7 supported above the roll. The rollers I! are journaled at the outer ends of the side arms [8, the inner ends of the side arms being slidably mounted on the cross shaft 19. The cross shaft is may be supported for limited movement toward and away from the blanket cylinder l6 on arms 20, the latter being pivotally supported on the inner side of each side plate Ill and l l. Tension spring 2| may be provided between the outer end of the arm 20 and a stud on the side plate H to bias the cross shaft 19 toward the cylinder Hi. The inner ends of the side arms iii are pivotally supported on the shaft I9 and may be moved laterally therealong to position the rollers I! a proper distance apart for the width of paper being printed and ejected by the machine. Each support for an ejecting roller ll is formed by a pair of spaced parallel side arms l8 connected together by a nut and bolt 22 extending between the arms and located intermediate of the ends of the arms. A roller 23 may be journaled between the inner ends of the arms 18 to bear against the impression cylinder l6.

The roller support attachment of this invention includes a member 3!] having a bushing 3| at its inner end adapted to be secured between the pair of side arms It by means of the nut and bolt 22 extending therethrough. The outer portion 32 of the member 3!) is bent upwards at an angle to the inner portion and is provided at its outer end with an upstanding boss 33 engaged by the coil sprin 34. The outer portion 32 of the member is also provided with laterally projecting lugs 35 for engagement with the upper edges of the side arms i8. A clamping member 36 is adjustably secured to the horizontal tie bar I2 by means of a wing bolt 31, and is provided with a downwardly extending threaded stud 38 secured to the bottom of the clamping member. An adjusting nut 39 is threaded on the stud 38 and provided with a downwardly extending boss 40 engaged by the upper end of the coil spring 34. The nut 39 may be provided with a knurled edge 4! to facilitate turning the same in adjusting the distance of the boss 40 from the clamping member 36, thereby permitting easy adjustment of the pressure exerted by the spring 34 on the roller support.

The attachment described above is easily applied to existing machines of the "Multilith type by removing the usual spacing collar on nut and bolt 22 between the side arms I 8, and substituting therefor the bushing 3| of the member 30. The projecting lugs 35 engage the upper edges of the side arms Is to prevent the outer portion 32 of member from engaging the ejector roller [1. The roller and side arm assembly is positioned laterally along the cross shaft I9 so that the roller I! is properly spaced for the width of the paper to be ejected. Next the clamp 36 is secured to the tie bar l2 by wing bolt 31 in a position above the roller H. The spring 34 is positioned between the boss 33 of member 30 and the boss 40 of adjusting nut 39, and manual adjustment of the nut 39 along the stud 38 away or toward the clamp 36 serves to increase or decrease the spring pressure applied to the roller support side arms l8 through the lugs 35.

It will be readily apparent that the simple attachment described above may be easil and quickly applied to the paper ejecting mechanism of existing or new machines of the type illustrated, and that the attachment provides means for applying an adjustable spring pressure tending to urge the paper ejecting rollers against the surface of paper or sheet material, whereby the latter is held in contact with a driven ejector roll and evenly ejected from the machine. The attachment also permits the rollers to be positioned laterally as desired for the width of paper to be ejected. It has been found that use of a device of the character described is efiective to assure proper and uniform ejection of printed sheets from printing presses, and that it avoids delays due to jamming or uneven action of conventional ejection mechanisms.

Although the above description relates to a specific form of a device for attachment to a "Multilith press, it will be readily apparent that many changes in minor details, proportions and design may be made in applying the device to similar machines and presses, and still be within the scope of this invention as defined in the following claims.

What I claim is: 1. An attachment for the paper ejecting mechanism of a lithographing machine of the type having a driven ejector roll and a roller cooperat ing therewith supported by a pivotally mounted arm, said attachment comprising an elongated member, one end of said member being adapted to be pivotally connected to said arm remote from said roller, the other end of said member being adjacent to said roller and having means engaging said arm, a clamp adapted to be secured to said lithographing machine adjacent to said roller, resilient means positioned between said clamp and the end of said member adjacent to said roller, and adjustable means engaging said resilient means for varying the compression of said resilient means.

2. An attachment for the paper ejecting mechanism of a lithographing machine of the type having a driven ejector roll and a roller cooperating therewith supported between a pair of pivotally mounted arms, said attachment comprising an elongated member, one end of said member being adapted to extend between said arms and having a bushing thereon adapted to be pivotally connected to said arms intermedi-.- ate of the ends of one of said arms, the other end of said member being adjacent to said roller and having projecting lugs for engagement with said arms adjacent to said roller, a clamp adapted to be secured to said lithographing machine adjacent to said roller, a coil spring positioned between said clamp and the end of said member adjacent to said roller, and threaded means carried by said clamp engaging one end of said coil spring for adjusting the compression force of said spring applied to said member.

NORMAN F. GARDEN, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 780,793 Hahn Jan. 24, 1905 985,014 Dexter Feb. 21, 1911 1,057,123 Dexter et al Mar. 25, 1913 1,148,509 .Gammeter Aug. 3, 1915 1,206,218 Hallstream Nov. 28, 1916 1,235,562 Freeman Aug. 7, 1917 2,313,163 Neal Mar. 9, 1943