US2112340A - Duplicating machine - Google Patents

Description

March 29, 1938. w. G. KLEMM 2,112,340

DUPLICATING MACHINE Filed Feb. 18, 1937 Patented Mar. 29, 1938 UNITED STATES DUPLICATING MACHINE William G. Klemm, Chicago, 111., assignor to Speed-O-Print Corporation, Chicago, 111., a corporation of Illinois I Application February 18, 1937, Serial No. 126,394

3 Claims.

This invention relates to improvements in a stencil duplicating machine.

The object of the invention is to provide an improved means for bringing the impression roller into operative engagement with the stencil carrying drum, and for throwing and holding it out of engagement therewith.

A further object is to provide an improved impression roller support so that the impression roller will at all times be held in true operative engagement and alignment with the stencil carrying drum.

A further object relates to means for varying the operative engagement of the impression roller with the stencil carrying drum, so that varying thicknesses of paper may be accommodated and the operative engagement of the roller and the drum adjusted to take up wear of parts, or suit the degree of pressure desired.

Other objects relate to economy of construction and the novel arrangement of parts, which will be apparent from a consideration of the description and drawing wherein;

Figure 1 is a side view of a stencil duplicating machine in which the improvements are incorporated.

Figure 2 is a fragmentary sectional view of Figure 1 showing the impression roller mounting and adjusting means.

Figure 3 is a detail in perspective of the impression roller mounting, engagement and adjusting means.

Figure 4 is a detail of an optional means for varying the operative engagement of the roller and the drum.

Referring to the drawing, l0 indicates the side frame of a conventional stencil duplicating machine having a stencil carrying drum l I journaled in the frame at I2.

A pair of bell crank levers l3 are pivotally mounted to the inner sides of the frame as at M, or in any other suitable manner. Extending between the sides of the frame is the impression roller I5, having its shafts journaled in one pair of arms of the bell crank levers as at Hi. In the preferred form shown, the ends of the levers carrying the roller shafts are crotched as at I! to form a bearing and a spring clamp I8 is provided to hold the shafts releasably locked in the crotch.

Extending between the other, or lower, ends of the bell crank levers is the tie rod I9 enabling them to act together. An actuating rod 20 extends between the side frames and is suitably a journaled therein, and has one end 2| extending to the outer side of the frame where it may be engaged by an actuating lever 22 or any other suitable means whereby it can be rotated.

The actuating rod 20 is axially ofiset as at 23 at which. portion it is engaged by the link 24, the said link also engaging the tie rod l9. It will thus be seen that rotation of the rod 20 by means of its external lever 22, will raise and lower the roller bringing it either into engagement with the drum or throwing it out of engagement therewith.

Several methods of limiting the movement of the impression roller to the drum, or varying their cooperative engagement may be provided. In Figure 3 one method is shown which provides a stop lever 25 locked to the rod by means of the set screw 26. Extending from this lever may be the pin 21 which abuts on the rib 28. In this way the stop lever may be variably locked to the rod 20 to limit its movement to a predetermined degree.

Figure 4 shows another method of varying the engagement or limiting the movement of the roller. In this method the stop lever is eliminated, and its work is performed by the turnbuckle 29 which replaces the link 24, so that by expanding or contracting the turnbuckle the degree of travel of the tie rod, actuating rod and impression roller is adjusted to a limited and predetermined extent.

Although I have shown and described certain features of my improvements for the purpose of illustration, it will be apparent to one skilled in the art that various changes may be made in the details and form of construction without departing from the spirit of my invention, and therefore, I do not wish to be restricted specifically thereto except as so limited by the appended claims.

What I claim is:

1. In a stencil duplicating machine, a frame, a stencil drum, an impression roller, bell crank levers pivoted within the sides of said frame and adapted to hold said roller on one pair of their arms, a tie rod extending between the other pair of said lever arms, a rotatable shaft extending substantially horizontally parallel with said tie rod in spaced relation thereto and having an axially offset portion, and a link extending from said offset portion to said tie rod, whereby rotation of said shaft will actuate said levers to carry said impression roller into and out of engagement with said drum and means acting against said shaft for limiting the rotation thereof and to hold said roller fixedly in its operative position.

2. In a stencil duplicating machine, a frame, a

stencil drum, an impression roller, bell crank levers pivoted within the sides of said frame and adapted to hold said roller on one pair of their arms, a tie rod extending between the other pair of said lever arms, a rotatable shaft extending parallel with said tie rod in spaced relation thereto and having an axially ofiset portion, and a link extending substantially horizontally from said offset portion to said tie rod, whereby rotation of said shaft will carry said impression roller into and out of engagement with said drum and means for varying the length of said link so that the degree of said rotation and said engagement may be predetermined and limited the said link being adapted to react against said shaft and to hold the roller against lowering movement when positioned in relative operative engagement w th said drum.

3. In a stencil duplicating machine, a frame, a stencil-drum, an impression roller, bell crank levers pivoted within the sides of said frame and adapted to hold said roller on one pair of their arms, a tie rod extending between the other pair of said lever arms, a rotatable shaft extending parallel with said tie rod in spaced relation thereto, and having an axially ofiset portion, and a link extendingsubstantially horizontally from said offset portion tosaid tie rod and adapted to react thereagainst, whereby rotation of said shaft will carry said impression roller into and out of engagement with said drum and an adjustable stop member carried by said shaft and adapted to abut on said frame, whereby the degree of said rotation and said engagement may be predetermined and limited.

WILLIAM G. KLEMM.

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