US2044984A

US2044984A - Duplicating machine

Info

Publication number: US2044984A
Application number: US694326A
Authority: US
Inventors: John W Hernlund; Jagger Hubert
Original assignee: Ditto Inc
Current assignee: Ditto Inc
Priority date: 1933-10-19
Filing date: 1933-10-19
Publication date: 1936-06-23
Anticipated expiration: 1953-06-23

Description

u,Mme 23, 1936. J. w. HERNLUND ET AL DUPLIY.GA'IING MACHINE s sheets-sheet@ Filled Oct. 19, 1933 HHHM E L -E www fewr? y fak?? ZIA-Herz: Zeta@ b J. W. HERNLUND ET Al. 2,044,984.-

DUPLIGATING MACHINE Filed oct. i9, 5 sheets-sheet 2l ffarlleyy.;

juni@ 23, QB.

1W. HERNLUND ET AL. 2,044,984

DUPLICATING MACHINE s Asheets-sheet 3 Filed Oct. 19, -1953 nw E .me

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Patented June 23, 1936 UNETED STATES ATENT OFFICE Jagger, Chicago, Ill.,

assignors to Ditto Incorporated, Chicago, Ill., a corporation of West Virginia Application October 19, 1933, Serial No. 694,326

22 Claims.

This invention relates to improvements in duplicating machines and, more especially, those oi the hectograph type.

The invention may be embodied, for example,

in a machine similar to the one disclosed in the co-pending application of Marchev and Hernlund, Serial No. 663,404, filed March 29, 1933.

In machines of this type there is provided a platen with a gelatin band supported thereon and a movable carriage above the same provided with a platen roller and a pressure roller cooperating to feed sheets of paper onto the duplicating surface. The platen roller is supported on a yoke which is rocked to move the roller upwardly and downwardly. When the roller is moved downwardly, it engages the paper and, cooperating with the pressure roller, forces one edge of the paper into contact with the duplicating surface 4on the gelatin band. The carriage is then moved to roll the platen roller over the entire surface of the sheet of paper in the duplicating process.

In lowering the platen roller, it is necessary or desirable to prevent rotation of the same. Unless such rotation is prevented, a certain amount of rotation will ordinarily be imparted to the platen roller when it engages the paper and presses the same against the pressure roller. By the use of our'invention, all rotation of the platen roller is prevented as it is moved from its upper to its lower position.

Not only is rotation prevented, but the roller is always held in one of a certain number of defnite positions. This cooperates with another feature of our invention, namely, means for insuring rotation of the platen roller at the `commencement of the movement of the carriage.

Another feature of the invention is the provision `of .a relatively soft platen roller. Heretofore, in machines of this type, the platen roller has ordinarily been harder, or in any event, not softer thanfthe gelatin surface of the gelatin band. One of the objects of our invention, however, is .to make lthe roller softer than the gelatin on the band. When the roller is thus made softer, however.,` it is necessary or advisable `to insure rotation of the same at the commencement of the movement of the carriage. Consequently, one of the 'features of Aour invention is the `making of a roller 'softer than the band or the coating thereon in combination with means for insuring rotation of said roller at the `commencement of the movement of the carriage.

Other features and `advantages of our inven- (Cl. lOl- 133) tion will appear more fully as we proceed with our specification.

In that form of device embodying the features of our invention shown in the accompanying drawings- Figure 1 is a view in side elevation; Fig. 2 is a top plan view; Fig. 3 is a view taken as indicated by the line 3 of Fig. 6; Figs. 4 and 5 are similar views showing the parts in altered positions; Fig. S is a view taken as indicated by the line 6 of Fig. 5; Fig. '7 is a view taken as indicated by the line 'I of Fig. 6; Fig. 8 is a view taken as indicated by the line 8 of Fig. 6; Fig. 9 is a view taken as indicated by the line 9 of Fig. 6; and Fig. 10 is a View taken as indicated by the line ID of Fig. '7.

As shown in the drawings, the duplicating machine is here shown as supported on a suitable cabinet Si. The general construction and operation of the machine is the same as that shown in the co-pending application of Marchev and Hernlund, Serial No. 663,404, filed March29, 1933 and, consequently, the same need be shown here in detail and described only sufficiently to disclose the invention claimed.

It will suffice to say that the machine includes a suitable frame IEl having the usual bed or platen Il and gelatin band i2 lying thereover. There is also provided the usual carriage I3 carrying the platen roller and pressure roller to be hereinafter described more in detail. I4 indicates a standard margin bar and I5, a sheet of paper with one edge resting against the same fed from the paper support I6.

Il indicates a platen roller mounted on the shaft i8 carried between the yoke members I9, I6 which, in turn, are carried on the rockable shaft 2l] operated by the handle 2|. By rocking the shaft 26, the platen roller is raised and lowered. Fig. 3 shows this roller in its uppermost position, Fig. 5 in its lowermost position, and Fig. 4 in an intermediate position. Cooperating with the platen roller I'I is a pressure roller 22 carried on the swinging links 23. Springs 24 yieldingly urge the pressure roller 22 to the left (as viewed in Figs. 3, 4 and 5). Stops 25 limit the movement of the pressure roller 22 in this direction. As the platen roller is lowered, it engages the pressure roller, the latter moving to the left against the tension of the springs 24 to permit the platen roller to pass. During the downward movement of the platen roller, the sheet of paper l5 is engaged between the two rollers, as shown in Figs. 3, 4 and 5, and one edge pressed against the gelatin band I2.

We shall now describe the means for preventing rotation of the platen roller il as it is lowered. This means includes an hexagonal member 26 on the shaft i8 which carries the platen roller I1. Adjacent this hexagonal member is a curved cam surface 2l adapted to engage one of the faces of the hexagonal member or nut 2t as the same is lowered. This engagement is maintained until the platen roller reaches its lowermost position or up to a point shortly before this occurs. One face of the nut being in engagement with the cam surface 2l thus prevents rotation of the roller il' during the lower operation.

In order to insure correct position of the hexagonal nut so that one of its faces will engage such cam surface, there is provided a spring 28 adapted to press against the nut 26 when it is in its uppermost position. The spring 23 forms virtually a continuation of the cam surface 2l. The pressure of the spring 25 will rotate the nut 26 until one of its faces is flat against such spring. It is thus positioned so that as it is lowered, this face will ride smoothly onto the cam surface 2l and such cam surface will prevent all rotation of the nut as the same is being lowered.

We have also provided means for insuring rotation of the platen roller at the commencement of the movement of the carriage. Such means includes a star wheel Si? on the platen roller shaft I8. This star wheel is provided with six points 30. 3| indicates a tooth fastened to the platen at one side and so located that when the platen roller is depressed, this tooth 3i will just engage one of the points 30 on the star wheel, the tooth lying just in front of the point. Since the platen roller I1, through the cooperation of the hexagonal member 26 with the cam surface il, is always held denitely in one of siX positions, the star wheel 3B is shown as provided with six points. The star wheel is so positioned and the tooth 3l is so located that in each of these positions, when the platen roller reaches the lowermost point of its travel, one of the points 3l will be brought into position just back of and against the tooth 3l. Consequently, as soon as the travel of the carriage commences, the tooth 3i will engage the point 3G behind it and initiate rotation of the platen roller. It is to be understood that the tooth 3| operates merely toninitiate rotation of the platen roller and functions only at the beginning of the travel of the carriage. During the further movement of the carriage, the platen roller moves over the sheet being printed and is adapted to be rotated by contact therewith. It will be seen from the above that the hexagonal member not only prevents rotation of the platen roller when the same is moved upwardly and downwardly, but also correctly positions the same to bring one of the points 3S on the star wheel in contact with and just back of the tooth 3E.

While we have shown and described certain embodiments of our invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of our invention as disclosed in the appended claims, in which it is our intention to claim all novelty inherent in our invention as broadly as permissible, in View of the prior art.

It is to be understood that the surface of the roller Il as here shown is softer than the band l2 or the gelatin or other coating that there may be thereon.

What we regard as new, and desire to secure by Letters Patent, is:

l. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; a member connected to the platen roller, said member having a projecting part; and a tooth on the bed so positioned that when the platen roller is lowered said projecting part will be brought into position just behind said tooth, whereby said tooth will engage said part to impart positive rotation to the roller when it begins its impression travel.

2. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; a member connected to the platen roller, said member having a plurality of projecting parts; and a tooth on the bed so positioned that when the platen roller is lowered one of said projecting parts will be brought into position just behind said tooth, whereby said tooth will engage said part to impart positive rotation to the roller when it begins its impression travel.

3l. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; a member connected to the platen roller and rotatable therewith, said member having a plurality of projecting parts; and a tooth on the bed so positioned that when the platen roller is lowered one of said projecting parts will be brought into position just behind said tooth, whereby said tooth will engage said part to impart positive rotation to the roller when it begins its impression travel.

4. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; a member connected to the platen roller and rotatable therewith, said member having a projecting part; a tooth on the bed; and means for positioning the roller, whereby said projecting part will be brought into position just behind the tooth when the roller is lowered, whereby said tooth will engage said part to impart positive rotation to the roller when it begins its impression travel.

5. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; a member connected to the platen roller and rotatable therewith, said member having a plurality of projecting parts; a tooth on the bed; and means for positioning the roller, whereby one of said projecting parts will be brought into position just behind the tooth when the roller is lowered, whereby said tooth will engage said part to impart positive rotation to the roller when it begins its impression travel.

6. Apparatus as claimed in claim 4, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, and a Cam surface adapted to engage one of said faces.

"7. Apparatus *as claimed in claim 4, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality `of flattened faces, a cam surface adapted to engage fone -of said 'faces during the lowering of the platen roller.

8. Apparatus as claimed in claim 5, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, and a cam surface adapted to engage one of said faces.

9. Apparatus as claimed in claim 5, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, and a cam surface adapted to engage one of said faces during the lowering of the platen roller.

l0. Apparatus as claimed in claim 4, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of attened faces, a cam surface adapted to engage one of said faces during the lowering of the platen roller, and yielding means for positioning the platen roller to cause engagement between said cam surface and one of said faces during the lowering of the platen roller.

1l. Apparatus as claimed in claim 5, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, a cam surface adapted to engage one of said faces during the lowering of the platen roller, and yielding means for positioning the platen roller to cause engagement between said cam surface and one of said faces during the lowering of the platen roller.

l2. Apparatus as claimed in claim 4, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, a cam surface adapted to engage one of said faces during the lowering of the platen roller, and yielding means for positioning the platen roller to cause engagement between said cam surface and one of said faces during the lowering of the platen roller, said yielding means cooperating with one of said faces.

13. Apparatus as claimed in claim 5, in which the means for positioning the roller includes a member connected to the platen roller and rotatable therewith, said member having a plurality of flattened faces, a cam surface adapted to engage one of said faces during the lowering of the platen roller, and yielding means for positioning the platen roller to cause engagement between said cam surface and one of said faces during the lowering of the platen roller, said yielding means cooperating with one of said faces.

14. In a machine of the class described the combination of a frame having a bed; a gelatin band on the bed; a platen roller movable along the bed; means for raising and lowering said platen roller with respect to said bed; and means for preventing rotation of said roller during the lowering thereof, said means comprising a cam surface extending in the direction of lowering movement of said platen roller and a member fixed to the platen roller having a flattened face engaging the cam surface.

l5. In fa machine of the class described the combination of; `a frame having a bed; fa gelatin band on the bed; a platen 'roller movable 'along the b'ed; means Afor vraising and lowering said platen roller with respect to 'said bed; and means for preventing `rotatibn of said roller during the lowering thereof, said mea-ns including a member connected to the roller and rotatable therewith, said member having a plurality of flattened faces circumferentially arranged about the axis of the platen roller and facing outwardly from said axis, and a cam surface extending in the direction of lowering movement of the platen roller and adapted to engage one of said faces during the lowering of the roller.

16. Apparatus as claimed in claim 15, in combination with yielding means for positioning the platen roller to cause engagement between Said cam surface and one of said faces during the lowering of the platen roller.

17. Apparatus as claimed in claim 15, in combination with yielding means for positioning the platen roller to cause engagement between said cam surface and one of said faces during the lowering of the platen roller, said yielding means cooperating with one of said faces.

18. In a machine of the class described the combination of; a frame having a bed; a gelatin band on the bed adapted to receive a sheet to be printed; a platen roller movable over said sheet adapted to be rotated by contact therewith, the surface of said roller being softer than the upper surface of the gelatin band; and means operating only at the beginning of the impression travel of the platen roller to impart positive rotation to said roller when it begins to travel.

19. In a machine of the character described, the combination of a printing bed for supporting a printing surface from which copies are to be made, a platen roller movable over said bed for pressing a copy sheet against the printing surface and adapted to be rotated by contact with the copy sheet, and means operating only at the beginning of the impression travel of the platen roller to impart positive rotation to said roller when it begins to travel, said means comprising cooperating members secured to the roller and bed respectively, and positioning means for said roller causing its member to engage with the member on the bed at the beginning of each impression travel.

20. In a machine of the character described, the combination of a printing bed for supporting a printing surface from which copies are to be made, a platen roller movable over said bed forpressing a copy sheet against the printing surface, means for raising and lowering said platen roller with respect to said bed, and means to prevent rotation of said platen roller during the lowering thereof, said last named means comprising a member rotatable with the platen roller and having a plurality of flattened faces on its circumference, a cam surface adapted to engage one of said faces during lowering of the roller, and yielding means for engaging said member to align one of said faces with the cam surface before the member reaches the cam surface during lowering of the roller.

21. In a duplicating machine having a printing bed, a carriage having a platen roller movable to and from said printing bed, and means to prevent rotation of the platen roller during a substantial part of its movement toward the printing bed, said means comprising a cam on the carriage, and a polygonal member fixed to the platen roller.

22. In a duplicating machine having a printing roller, said cam having in part a yielding track bed, a carriage having a platen roller movable for engaging said polygonal member to provide to and from said printing bed, and means to prefor manual rotation of the platen roller While vent rotation of the platen roller during a subin raised position. stantial part of its movement toward the printing JOHN W. HERNLUND. bed, said means comprising a cam on the car- HUBERT JAGGER. riage, and a polygonal member xed to the platen