US2038568A - Paper straightening device for duplicating machines - Google Patents

Description

MACHINES Aprii H. JAGGER PAPER STRAIGHTENING DEVICE FOR DUPLICATING 2 Sheets-Sheet l Filed May 26, 1954 H. JAGGER April 2%, 1936.

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MACHINES PAPER STRAIGHTENING DEVICE FOR DUPLICATING Filed May 26, 1934 2 Sheets-Sheet 2 172M652 far: 11212767"?! Jay 8 r,

Patented Apr. 28, 1936 PATENT OFFlQE PAPER STRAIGHTENING DEVICE FOR DUPLICATING MACHINES Hubert Jagger, Chicago, Ill.,

Incorporated, Chicago, 111.,

West Virginia assignor to Ditto, a. corporation of Application May 26, 1934, Serial No. 727,636

2 Claims.

This invention relates to duplicating machines of the type wherein a roller is adapted to press a copy sheet down upon a printing surface. In machines of the type to which this invention relates, there is usually'provided a bed plate or platen upon which a gelatin or hectograph sheet is supported.

A suitable carriage is movably mounted over the bed plate so that it may be moved lengthwise of the bed plate. This'carriage is provided with a platen roller for pressing the copy sheets down against the gelatin surface and may, or may not, have a pressure roller cooperating with the platen roller to feed the copy sheets. A

paper guide is mounted on the carriage and there isa margin bar which is adapted to be engaged by the edge of the copy sheet to position the paper.

,I n machines of this character, when'the copy Sheets are being removed after being rolled down on a, printing surface, they are inclined to be curved-because of the fact that they have been pressed into a more or less curved condition by the platen roller and the pressure roller.

It is a purpose of this invention to provide means for straightening out the copy sheets as the paper is stripped off the gelatin surface.

' More specifically it is a purpose of this invention to provide means cooperating with the 80 platen roller to cause a straightening of the copy sheets as they are stripped from the gelatin surface .on the return movement of the carriage.

Other objects and advantages of the invention will appear as the description progresses in con- 35 nection with the accompanying drawings in which- Fig. 1 is a plan view of a duplicating machine embodying my invention;

Fig. 2 is a section on the line 22 ofFig. 1-;

40 Fig. 3 is a plan section substantially on the line 3-3 of Fig. 2;

Fig. 4. is a reduced section similar to the section of Fig. 2, but showing a modified form; and Fig. 5 is a similar section showing a slightly 45 dilferent modification.

Referring now to the drawings wherein a pre- 7 ferred embodiment is illustrated, A designates the frame of the duplicating machine, B designates the bed plate or platen mounted on the 50 frame A, and C designates the carriage which is slidable lengthwise of the frame A and which is adapted to apply a copy sheet to the gelatin or duplicating band D which is stretched over the bed plate B.

55 The mechanism constituting the present invention is located wholly on the carriage C and the future description will be substantially limited thereto, it being understood that this carriage is adapted to be moved to the right as shown in Figs. 1 and 2 in placing the sheet down on the 5'5 gelatin band and then is given a return movement to the left in stripping the sheet off of the band in preparation for applying a new sheet.

The carriage has mounted therein the platen roller ll! which is pivotally supported by a pair of arms such as H and I 2, there being one of these arms at each side of the carriage. These arms are keyed upon the shaft l3 which is journaled in suitable bearings at M and I5 in the carriage frame. The operating handle or arm position. This is accomplished by the coil springs 23' I8 and I9 which as shown, are connected at one end' to the arm as indicated most clearly at 29 in Fig. 2, while the other end of the spring after being coiled around the shaft l3 is'secured to the depending bracket 2| on the carriage 30"- frame, it being understood, of course, that there is a bracket for each spring.

The pressure roller 22 is suspended on suitable arms such as 23 and 24 and is urged into contact with the platen roller by means of the springs 25 and 26. The structure is shown most clearly in Figs. 2 and 3.

A paper guide 2l' is mounted in the carriage frame so as to feed paper down over the pressure roller and between the pressure roller and the platen roller in a manner which is well known in the art.

There is provided a margin bar 28 for properly aligning the copy sheets and positioning them with respect to the duplicating surface.

The structure so far described is more or less well known and its operation it is believed, will be clear from the description just given.

Now in operating the carriage after the sheet is fed beneath the platen roller and the platen roller is lowered to press the sheet against the duplicating surface, the carriage is moved forward, that is, to the right in Fig. 2 so that the sheet is fed down between the rollers I0 and 22 to the duplicating surface. However, the end of the sheet'is left between the rollers at the end of the duplicating step. On the return of the carriage the rollers act to strip the paper from the duplicating surface and feed it upwardly. Owing to the pressure exerted by the rollers, the sheet is inclined to curve over the platen roller and to come out of the machine in this curved condition. This condition of the copy sheet is particularly noticeable where cards or heavy stiff paper is being used for the copies. To overcome this diificulty, I provide means for straightening the copy sheet as it is stripped off the duplicating surface.

In the form shown in Fig. 2, this means consists of a bar 30 which lies directly over the junction between the platen roller and the pressure roller and which as shown in cross-section in Fig. 2, has rounded smooth edges so as to guide the copy sheet in the direction shown in Fig. 2. This guide presses the sheet back into straight position and eliminates a great deal of the curved condition which is objectionable. The bar 30 is supported at its opposite ends by the brackets 31 and 32 which as shown most clearly in Fig. 3, have, an angle portion riveted to the platen roller arm and the bracket has the upstanding portion indicated, for example, at 33 on bracket 3| to which the bar 30 is secured.

Now in certain of the machines no pressure roller is used and in such a machine the paper is fed directly from the paper guide beneath the platen roller. In this type of machine I prefer to provide a somewhat different means for stripping the paper and returning it to the paper guide. It might be mentioned at this time that the straightening cf the paper as indicated in Fig. 2 will cause the sheet to fall back upon the paper guide rather than over the carriage frame as it did when in curved condition.

In Fig. 4 the carriage structure and the platen roller carrying structure is substantially the same as in Figs. 1 to 3, but in this case the paper guide 21 has been lowered in the carriage frame by cutting away the carriage frame as indicated at 35 so that the guide lies much more nearly in a horizontal position, making an angle of somewhere between ten and fifteen degrees with the horizontal. This paper guide has its lower end 36 extended down close to the platen roller and just above the surface of the duplicating band. Also it is preferable to give the lower end portion of the paper guide from a point indicated approximately at 31 in Fig. 4, a somewhat greater angle with respect to the bed plate to facilitate the stripping of the paper in the manner which will now be described.

In the operation of this type of carriage, the copy sheet is placed beneath the platen roller and against the margin bar in the usual fashion and the carriage is pushed to the right as shown in Fig. 4 to roll the sheet down upon the duplicating surface. The carriage is stopped, however,

guide 21' before the end of the sheet moves off the paper and on the return movement of the carriage the lower edge 36 of the paper guide functions to strip the sheet from the duplicating surface and guide it upwardly along the paper guide. Owing to the fact that the paper guide is dropped so low there is very little curvature imparted to the sheet by pressing it upon the duplicating surface so that by its own weight, the sheet will flatten down as it is fed up along the paper guide in the return movement of the carriage. It is sometimes necessary with copy material that is particularly bad to curl to utilize additional means for causing the paper to lie down in the paper guide during the stripping operation.

To accomplish this I have provided means which is shown most clearly in Fig. 5. This means consists of the guiding member 38 which is bent up from the side of the paper guide and then extended over the paper guide as shown so as to hold the paper down as it is stripped from duplicating surface. The upper end of this member 38 is bent upwardly as indicated at 39 to aid in inserting the copy sheets.

While a certain embodiment of the invention has been shown and described, 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 the invention as disclosed in the appended claims in which it is intended to claim all novelty inherent in the invention as broadly as possible in view of the prior art.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. In a duplicating machine, a platen, a carriage adapted to move over said platen to apply a copy sheet to a duplicating surface on said platen, and to strip the sheet from said surface, a platen roller, a paper guide for guiding the copy sheet to the platen roller, a pressure roller, and means for bending the copy sheet back over the guide on the stripping movement of the carriage, said means comprising a bar above that portion of the platen roller which is adjacent to the pressure roller, said bar having rounded upper and lower edges.

2. In a duplicating machine, a platen, a carriage adapted to move over said platen to apply a sheet to a duplicating surface on said platen, and to strip the sheet from said surface, a platen roller, arms pivoted on said carriage and supporting said roller, a paper guide for guiding a sheet to said platen roller, and means for bending the sheet back over the paper guide on the stripping movement of said carriage, said means comprising brackets on said arms, a bar connecting said brackets and spaced above the portion of said roller nearest the paper guide.

HUBERT JAGGER.

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