US2059214A - Paper feeding device - Google Patents

Description

Nov. 3, 1936. E. H. DREHER PAPER FEEDING DEVICE Filed April 21, 1954 2 Sheets-Sheet l INVENTOR ATTORNEY V- 1936. E. H. DREHER PAPER FEEDING DEVICE Filed April 21, 1934 2 Sheets-Sheet 2 INVENTOR ATTORNEY WiTNESSES maw zw fr y/QM attend adjustment and maintenance.

Patented Nov. 3, i936 PATENT OFFME 2,059,214 PAPER FEEDING DEVICE Elmer H. Dreher, Brooklyn, N. 5L, assignor to Remington Rand lnc'., ration of Delaware Buffalo, N. Y a corpo- Application April 21, 1934, Serial No. 721,664 2 Claims. (01. 197-138) This invention relates broadly and generally to the rotary type of printing platen mechanism, hence only such prior art, as may be necessary establish a satisfactory matrix will be described. It relates particularly to platens such as those disclosed in connection with mechanism of patents to Lasker 1,317,509, dated September 1919, 1,571,955, dated February 9, 1926, 1, 627,- 394, dated May 3, 1927, 1,920,993, dated August 8, 1933,to Last 1,849,494, dated March 15, 1932 and Laskers copending application Serial No. 684,438, filed August 9, 1933, but its use is not so restricted.

The invention is directed to overcome the uneven feeding of paper as it passes around the platen and certain objectionable features which It is well known that diiiiculty arises in securing even feeding of paper around rotary platens whenever the paper, or papers, being fed are of nonuniform thickness. This fault in the feeding necessitates the expenditure of considerable time in truing up the paper. Usually the tension on the respective pairs of feed rolls is supplied by springs attached to each of the pairs and anchored to the plate which supports the platen.

. Such spring arrangement is'non-adjustable and mechanism in machines chines, typewriters,

cannot be repaired without dismantling the entire platen.

One object of the present invention is to make general improvements in the paper feeding using rotary type platens.

Another object is to assure even feeding of the paper as it passes over the platen.

Another object is to provide a new and improved form' of feed roll tensioningmechanism.

Another object is to provide novel means for equalizing the tension on the feed rolls.

Another object is to provide readily adjustable means for varying the feed roll tension between different points on the platen.

Another object is to provide novel changes in construction whereby satisfactory operation is more readily maintained.

Another object is to provide features whereby the mechanism is more readily accessible for repair.

The present invention relates to a novel arrangement of mechanism for supporting, guiding and {controlling feed rolls which feed the paper around the printing platen of tabulating matypewriting bookkeeping machines, typewriting-adding machines, adding machines and other similar-machines using to tary type platens, and comprises means whereby the tension on the feed rolls may be automatically equalized to assure even feeding of paper of varying thickness or papersof various thickness; whereby the feed roll tension may be adjusted 5 without disassembling the platen unit and whereby the spring member of. the tension mechanism may be replaced without disassembling the platen unit.

Other objects and structural details of the invention will be apparent from the following description when read in connection with the accompanying drawings which form a part of this specification, and in which:

Fig. 1 is a perspective view of a platen support- 5 ing plate, platen drive mechanism, one platen roll of a split platen unit and the mechanism of this invention.

Fig, 2 is a fragmentary view of a platen supporting plate showing a complete unit of the 20 mechanisms of this invention mounted thereon.

Fig. 3 is a view of a section through the mechanism of Fig. 2 taken on the line 3-8.

General descfiptz'on The present invention contemplates the com- 25 bination of means hereinafter to be fully described, and a rotary platen of standard construction and operation.

The mechanism comprises a supporting plate 0 l, supporting brackets 2, platen 3, feed rolls 8 and la, and the feed roll tension mechanism which will be described in detail hereinafter. The platen may be one continuous cylinder mounted according to any of the usual methods; 35 or, it may be a so-called split platen, one element of such a platen being shown in Fig. 1. The feed roll tensioning mechanism consists of supporting brackets ll, control links H, links l3, short 7 equalizer bars 84, long equalizer bars 85, retain- 4o ing plates 16, bell cranks l'l, springs l8, and shafts 2i and 22, together with such screws, rivets, pins, washers, collars and spacers as may be necessary for proper assembly.

A pair of feed rolls 4 and 4a are journaled opposite ends of a pair of arcuate supporting brackets ii. The supporting brackets H are journaled at their mid-points to the control links f2 which are suspended from the shaft 2 l. Links l3 connect control links l2 to equalizer bars M 50 which are pivoted at their mid-points to equalizer bars l5, which latter are similarly pivoted at their mid-points to the horizontal arms of the bell cranks ll. Retaining plates l6 restrain and guide the assembled equalizing mechanism which 2 resembles the well known wagon-whiifie tree in its construction.

The shaft 22, journaled in hangers 23 and under control of a manipulative lever, (not shown), acts upon projections 24 on the control link [2. Shaft 22 is milled to provide a flat surface which is maintained in contact with projection 24 by the spring action of member l8. Movement of the lever causes shaft 22 to exert a cam action against projection 24 and remove the feed rolls 4 and 4a from contact with platen 3.

Feed roll tensioning The paper is inserted between the feed rolls 4a and the platen 3; and the platen is turned counterclockwise, as viewed in Fig. 3. The presence of this paper causes each feed roll assembly, consisting of members 4, 4a, and H, to be displaced downwardly. This downward movement causes tension to be applied to a set of elements, consisting of control links [2 and connecting links l3. Two sets of these elements are associated with each of the short equalizer bars [4. The motion of the bars I4 is transmitted to the long equalizer bars l5, and thence to the horizontal arm of one or the other of the bell cranks H. The movement of the bell cranks causes the respective vertical arms thereof to move in directions opposite to each other, which latter motion is restricted by the spring 18.

It is apparent that even through the paper may be of varying thickness the rolls will adjust themselves in such a way as to exert a uniform pressure against the platen, since the tension upon all rolls is exerted by one spring.

The tension may be varied by moving the spring i8 upwardly or downwardly along the notched vertical arms of the bell cranks IT. The amount of tension varies according to the distance of the spring l8 from the fulcrum of the bell crank l1. Hence, if light pressure is desired at one end of the platen, the anchor point of the spring I8 is moved downwardly on that bell crank H which is associated with those feed rolls at the end where the decreased pressure is desired.

When the necessity for renewing the spring It arises it may be removed from its mounting through the aperture is and a new spring inserted and hooked on to the bell cranks H7. The notches on the outward sides of the bell cranks afford means for retaining the spring l8 in any position in which it may be set.

While I have described what I consider to be a highly desirable embodiment of my invention, it is obvious that many changes in form could be made without departing from the spirit of my invention, and I, therefore, do not limit myself to the exact form herein shown and described, nor to any thing less than the whole of my invention as hereinbefore set forth, and as hereinafter claimed.

What I claim as new and desire Letters Patent, is:

1. In a device of the character described, a platen, a plurality of feed rolls, pairs of said rolls being journalled in parallel relation in arcuate side members, connecting means for pivotally securing said side members to the ends of a pair of whifile tree members, each of said whifile trees being pivotally secured to one leg of an L-shaped arm, said L-shaped arms being pivotally mounted on a frame, a tension spring connecting the other legs of said arms to maintain said feed rolls in equalized pressure engagement with said platen, and camming means acting on said connecting means for moving said rollers out of engagement with said platen.

2. In a device of the character described, a platen, a plurality of feed rolls mounted in pairs parallel to the transverse axis of said platen, an equalizing means for said rolls comprising an arcuate carriage for each pair of rolls, said carriage being pivotally mounted in a train of links secured to each end of a pair of a whifile tree members, said whifile trees being pivotally mounted on one end of a pair of L-shaped arms which are pivotally secured to a frame, a tension to secure by spring connecting the other leg of said arms to l maintain said feed rolls in equalized frictional engagement with said platen and a shaft, having cam faces thereon running parallel to said platen and journalled on said frame and co-operating with an arm on one of said train of links for each of said carriages to effect the withdrawal of said pressure rolls from said platen.

ELMER H. DRE-HER.

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