US1370240A - Stenciling-machine - Google Patents

Description

B. C. STICKNEY.

STENCILING MACHINE.

APPLICATION FILED JULY 9.1919.

Patented Mar. 1, 1921.

V revoluble cylinder.

UNITED STATES PATENT OFFICE.

BURNHAM C. STICKNEY, OF ELIZABETH, NEW JERSEY, ASSIG -NOR TO TINDERWOOD TYPEWRITER COIYIPANY, OF NEW YORK, N. Y., A CORPORATION OF DEIJAVTARE.

STENCILING-MACHINE.

Specification of Letters Patent.

Application filed July 9, 1919. Serial No. 309,700.

To all whom it may "concern:

Be it known that I, BURNHAM C. STICK- NEY a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Stenciling- Machines, of which the following is a specification.

This invention relates to stenciling devices, and is herein disclosed as applied to a revolving duplicator in which a stencil sheet is stretched around the periphery of a An inked mat or surface upon the cylinder forces ink through the stenciled sheet upon the work-sheet.

In such devices it is important that any adjustments be simple and dependable, inasmuch as the devices are usually put into tie hands of persons unfamiliar with the use of machinery.

One of the difficulties in obtaining satisfactory impressions from a stenciling device of the class described, arises from the fact that the work-sheet or impression paper is held against the stencil surface by a roller, which must press smoothly, evenly and with the proper tension to insure a good impression.

The present invention is especially directed to devices for insuring an even pressure of the roller, and to the provision of means whereby an inexperienced person may readily adjust such Pressure.

To this end the impression roller is held up against the cylinder, or the work thereon, by means of two main springs, one at each end of the roller; these springs being preferably adjustable, and preferably arranged to be adjusted permanently when manufacturing, their adjustment not to be disturbed by the user of the machine. These springs act upon levers, through which they operate upon the roller. The levers are connected by a cross-rod, to the middle portion of which is connected a third spring, which constantly tends to release the roller from the stencil cylinder. The tension of this releasing spring is regulatable by the operator, by turning a single nut, permitting him to adjust the strength of the opposition that is exerted by the releasing spring against the tension that is exerted by the main springs, until just the right pressure of the roll against the impression cylinder is secured. Moreover, the point at which this releasing or counter-acting spring acts upon the cross-rod may be shiftable, so that it Wlll exert greater pressure upon either lever than upon the other, as may be required in evening up the ends of the roller, or adapting it for different kinds of work. When ever it is desired to release the roller from the cylinder, said releasing spring is given anextra tension by turning a handle, thereby overcoming the tension of the main springs, and drawing down the roller. Upon reversing the handle, the roller is restored by the main springs.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is an end view, largely diagrammatic, showing the impression cylinder and the frame, parts being broken away.

Fig. 2 is a detail view of the devices for adjusting the spring pressure of the roller.

Fig. 3 is a detail side view, showing the adjusting devices manipulated by a fingerpiece to withdraw the roller from ,the cylinder.

Fig. 4.- is a fragmentary perspective view of the roller and the principal parts connected therewith.

Fig. 5 is a perspective view of a device for positioning the adjusting spring toward one side or the other.

The cylinder 10 of the duplicating devices is mcunted to revolve about a horizontal axis in a frame 11 having rolls 12, and is adapted to carry on its foraminous surface 18 a stencil sheet, against which an impression sheet or work-sheet is adapted to be pressed by a roller 14. The impression sheets are fed to the bite of the roller 14 upon the cylinder 10 over a paper table (not shown), and are delivered to another paper table (not shown).

riccoroing to the present invention, the roller 14, which may be of any suitable material, is provided with gudgeons 15 which revolve in journals 16, formed as depressions in swinging bars or levers 17. The bars 17 are pivoted upon pins 18, and are pressed up by springs 19, which bear against set screws 20, threaded into brackets 21, projecting inwardly from the standards 22 of the frame. The springs 19 are held against slipping on the bars 1? because they fit around pins 23 upon said bars. The machine is usually sent out from the factory with the screws 20 properly adjusted to evenly raise the two barsl'Z, so that, when Patented Mar. 1, 1921.

the cross-bar or piece 26 and with it the roller 14 against the tension of the compression springs 19. To enable the tension of the spring 27 to be adjusted, it is connected at its lower end to an eye bolt 28, which passes through a lug 29 of an arm 30 and carries a thumb-screw-nut 3i threaded onto the bolt beneath the lug 29, with the result that the spring 27 may be tensioned by screwing up the thumb-nut 31. The spring 27 may be of considerable length so that a considerable variability of adjustment may be made, it being strong enough to overcome both of the springs 19, if tensioned strongly enough, as will hereinafter appear. 7

If the operative finds that there is unevenness of stenciling, or that,for any reason, either side of the roller'14 holds the impression paper too tightly upon the cylinder 10, the spring 27 may be caused to pull down more upon that end of the crosspiece 26. To enable this to be done, the

' spring 27, instead of drawing directly upon the cross-piece 26, draws upon nut 33 threaded upon the cross-piece 26. At its middle, the upper end 34 of the spring 27 is bent to an angle to fit the squared portion 32, thus preventing the thumb-screw or nut 33 from turning accidentally. There are collar portions 35 upon the sides of the squared portion 32. The spring 27 lifts or yields as the thumbscrew 33 is turned, since the spring hook catches loosely over the part 32. The end 34 of the spring is carried nearer one or the other end of the crosspiece 26, depending upon which way the nut 33 is turned. If, for example, the operative finds that the roller 14 bears too heavily upon the right-hand end of the cylinder 10, the nut 33 is screwed toward said right-hand end until the shifting of the tension of the spring 27 properly adjusts the relative ten- In the Fig. 3 position, the

"upon it draws the finger-piece around until it is arrested by a stop 40, which therefore holds the roller 14 in its lowered position. In order to prevent the spring 27 from pulling the arm 30 too far upward, there may be provided a stop 41, against which the end 42 of the rock arm 37 may strike. This stop is herein shown as a set screw threaded into a lug 43, thus enabling it to be adjusted, as desired. Such provi sion for adjustment, however, will in many cases be unnecessary, since all necessary adjustment can be effected by turning the thumb-screw 31. For convenience in construction, the lug 29 may be in the form of a shouldered bolt passing through the rock arm 30 with a nut 44 threaded onto it.

' Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a duplicating device, the combination with a cylinder and a pressure roll, of a swinging ournal for each end of the roll, a spring for each journal adapted to support it to hold the pressure. roll against the cylinder, a cross-piece connecting said journals, and a resilient device adapted'to variably draw down on said cross-piece to vary the pressure of the roll upon the cylinder. I

r 2. In a duplicating device, the combina-; tion with a cylinder and a pressure roll, of aswinging journal for each end of the roll, a spring for each journal adapted to support it to hold the pressure roll against the cylinder, a crosspiece connecting said journals, a resilient device adapted to variably draw down on said cross-piece to vary the pressure of the roll upon thecylinder, and means to shift the device along the cross-piece to alter the relative pressure '01"- 'the two ends of the roll upon the cylinder.

3. In a duplicating device, the combination with a cylinder and a pressure roll, of a swinging journal for each end of the roll, a spring for each journal adapted to support .it to hold the pressure roll against the cylinder, across-piece connecting said journals, a frame in which said journals and cylinder are carried and including two ends, a rock shait journaled in saidends, a rock arm on said shaft, a spring connecting said arm and said cross-piece, and a device for limiting the turning of said rock shaft, w

4. In a duplicating device, the combination with a cylinder and a pressure roll, of a swinging journal. for each end of the roll, a spring for each journal adapted to sup port'it to hold the pressure roll against the cylinder, a cross-piece connecting said journals, a frame in which said journals and cylinder are carried and including two ends, a spring connected to said cross-piece, a shaft extending between said ends, and a device connecting the spring to the shaft and adapted to vary its tension.

5. In a duplicating device, the combination with a cylinder and a pressure roll, of a swinging journal for each end of the roll, a frame comprising ends and supporting said cylinder and journals, a spring mounted upon the frame, for each journal to support it to hold the pressure roll against the cylinder, a cross-piece connecting said journals, a rock shaft beneath said crosspiece and journaled in the frame, a rock arm fast upon said shaft, a spring connect ing said rock arm and said cross-piece, a device for varying the tension of the spring, and a finger-piece adapted to rotate the shaft to tension the connecting spring to withdraw the roll from the cylinder.

6. In a duplicating device, the combination with a cylinder and a pressure roll, of

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a swinging journal for each end of the roll, a frame comprising ends and supporting said cylinder and journals, a spring, mounted upon the frame, for each journal to support it to hold the pressure roll against the cylinder, a cross-piece connecting said journals, a thumb screw threaded upon said cross-piece and forming a shiftable anchorage, a rock shaft beneath said cross-piece and j ournaled in the frame, a rock arm fast upon said shaft, a spring connected to said anchorage and adjustably connected to said rock arm, and a finger-piece adapted to rotate the shaft to tension the last-named spring to withdraw the roll from the cylinder and hold it withdrawn.

7 In a duplicating device, the combination with a frame and a cylinder j ournaled therein, of a roll, a swinging journal for each end of the roll, means for resiliently supporting said journals to hold the roll against the cylinder, a cross-piece connecting the journals, a spring for drawing down on the cross-piece, means for adjusting the tension of the spring, and means for shifting the spring along the cross-piece.

8. In a duplicating device, the combination with a frame and a cylinder journaled therein, of a roll, a swinging journal for each end of the roll, means for resiliently supporting said journals, to hold the roll against the cylinder, a cross-piece connecting the journals, a spring for drawing down on the cross-piece, a rock shaft below the cross-piece, a rock arm fast upon the shaft, means for adjustably tensioning the spring to the rock arm, means shifting the spring along the cross-piece, and means for rocking the shaft and holding it rocked to move the roll clear of the cylinder against the tension of the resilient support.

9. In a duplicating device, the combination with a frame and a cylinder journaled therein, of a roll, a swinging journal for each end of the roll, means for resiliently supporting said journals to hold the roll against the cylinder, a cross-piece connecting the journals, a spring for drawing down on the cross-piece, a rock shaft below the cross-piece, a rock arm fast upon the shaft, means for adjustably tensioning the spring to the rock arm, means for shifting the spring along the cross-piece, a second rock arm fast to the shaft, a pivoted finger-piece, a link connecting said second arm and said finger-piece, and a stop for arresting said finger-piece when the link is carried past dead center to hold the roll in its clear position.

10. In a duplicating device, the combination with a frame and a cylinder journaled therein, of a roll, a swinging journal for each end of the roll, a spring for each journal, a set screw for adjusting the tension of each spring, to independently press each end of the roll against the cylinder, a cross-piece connecting said journals, and a third spring adjustable along the cross-piece to draw thereon against the tension of the first springs to vary the pressure of the roll upon the cylinder.

11. In a duplicating device, the combination with a frame and a cylinder journaled therein, of a roll, a swinging journal for each end of the roll, means for resiliently supporting said journals to hold the roll against the cylinder, a cross-piece connecting the journals, a spring for drawing down on the cross-piece, a squared thumb screw adjustable upon the cross-piece forming an anchorage for the spring, an extension of said sprlng COIllPIlSlIl' a screw for adjusting it, a rock arm on which the screw draws, a rock shaft carrying said arm, and a fingerpiece adapted to turn said shaft to carry the roll clear of the cylinder.

12. In a duplicating device, the combination with a frame and a cylinder journaled therein, of a roll, a swinging journal for each end of the roll, means for resiliently supporting said journals to hold the roll against the cylinder, a cross-piece connecting the journals, a spring for drawing down on the cross-piece, a squared thumb screw adjustable upon the cross-piece forming an anchorage for the spring, an extension of said spring comprising a screw for adjusting it, a rock arm on which the screw draws, a rock shaft carrying said arm, a fingerpiece journaled on the frame, a second rock arm fast upon said shaft, a link connecting said second rock arm and said finger-piece, and stops limiting the throw of the shaft, one of said stops adapted to hold it when the link is thrown past dead center.

BURNHAM C. STICKNEY.

WVitnesses:

EDITH B. LIBBEY, JENNIE P. THORNE.

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