US2269199A - Duplicator - Google Patents

Description

Jan. 6, 1942.

H. HILDEBRANDT' DUPLICATOR Filed July 51, 1959 yay Patented Jan. 6, 1942 UNF-FEI.)` STATES V PATENT OFFICE 2,269,199 'f c Y DUPLIoA'ToR" HenryHildebrandt, Chicago, Ill. Application July 31, 1939, serial Nv.,2s7,547 3 Claims. (Chlor-111s) My invention relates to improvements in duplicators and more particularly to an improvement in the feeding mechanism thereof, the present invention being lan improvement on that disclosed in the prior patent to Gerrmann No. 2,062,876, dated December 1, 1936.

The primary object of the present invention is to provide a duplicator so constructed andarranged that narrower sheets of paper than those for which the machine is primarily designed may be fed therethrough.

Other objects will appear hereinafter.

'I'he invention consists in the combinations and arrangements of parts hereinafter described and` claimed.

The invention will be best understood by reference to the accompanying drawing forming a part hereof and in which:

Fig. 1 is a partial side view, shown partially in section, of a duplicator of well known construction to which my improvement has been applied;

Fig. 2 is a partial horizontal section thereof and Fig. 3 a detail view showing the operating parts in different positions from those shown in Figs. l and 2. i

The embodiment of the invention illustrated in the drawing comprises a frame I in which a stencil cylinder II is rotatably mounted, said cylinder carrying the usual inked stencil in the usual manner. The usual impression roller I2 has its trunnions I3 rotatably mounted in bearings I4 on `operating arms I5 which are pivoted at I6 on the frame of the duplicator. The arms I are normally drawn upwardly by means of tension springs I'I to apply the impression roller to the stencil cylinder in the usual way. Paper stops I8 carried by rocker arms I9 mounted on rocker shaft 20 serve in the usual way to stop and properly position the sheets of paper 2I fed to the machine in the usual way, there being one of the stops I8 'at each side of the machine.

Suitable cam mechanism, not shown, is provided for periodically depressing the impression roller and operating the shaft 20 and the stops I8 'in timed relation with the cylinder I I as is usual in duplicators of this character.

Each of the arms I5 is provided on its inner side with an adjustable stop 22 adjustably mounted as shown in a lug 23 on its inner side. Latch members 24 are pivoted as shown at 25 to hang normally in substantially vertical positions at each end of the cylinder II in the upward path of the stops 22 so that when in normalpositions the latches 24 will prevent upward movement of theimpression roller I2 as will be readily understood. Each latch 24 carriesat its top a projection 26 arranged in the path of the corresponding edge of the paper sheet and immediatelyin front of the corresponding stop I8 substantially at the vplanel of contact between the cylinder 'I I and roller I2 so that as each sheet is fed into' the machine against the stops I8, its sides will first contact with the latch projections 26 and tilt saidlatches 24 out of the paths-ofv thestops 22 thus permitting upward movement of the' roller I2 when a paper sheet is in proper position between said cylinder and roller against the stops .I 8. By this arrangement contact of the impression roller with the stencil is prevented when no paper sheet is between the cylinl der and roller and whereby soiling of the impression rollerby thestencil sheet is prevented. The parts already described, or their equivalents, are shown in the' said Patent No. 2,062,876, and constitute no part of my present invention except insofark as they cooperate with the partsto be presently described. y 1 1 However a duplicator constructed'in accordance with rthe said Patent No;v 2,062,876 is designed and .intended to use only sheets kof a standard width and Ifhave therefore added to such construction the parts to be presently described which are constructed and rarranged to operate to permit the feeding of narrow sheets of paper through the duplicator for short periods of time.

To this end I arrange release members 21 at each side of the machine and pivoted at 28 to the underside of the normal feed table thereof.

Each of these release members is provided with an upstanding operating lip or thumb piece 29 projecting upwardly adjacent the corresponding table edge in position to be readily manipulated by the operator. Each release member 211s also provided with a downwardly and rearwardly extending release arm 30 arranged as shown to contact with a stop lugy 3| on the forward side of the corresponding latch member 24 so that when the thumb pieces 29 are swung inwardly the latches 24-are tilted into inoperative positions as indicated in Fig. 3 and whereby either or both of said latch members 24 may be selectively rendered inoperative or ineffective as and when desired. 'The frictional resistance on the release members 2'I is sufficient to hold said latch members in inoperative positions until the thumb pieces 29 are swung outwardly, whereupon said latch members will return to their normal operative substantially vertical positions over the stops 22 as will be readily understood. By this arrangement when it is desired to feed sheets of paper through the machine of less than the normal width for which the machine is designed and intended one of the latch members 24 may be thus rendered inoperative so that the feeding of the sheets through the machine against the normal and usual sheet guide at the other side thereof will operate the corresponding latch member 24 and thus render the use of narrower sheets possible. Obviously if la narrower sheet were fed through the machine While both of the latch members 24 were in operative positions, one of said latch members would necessarily remain operative, thus preventing normal elevation and operation of the impression roller under such circumstances. But where one of the latch members 24 is thus rendered inoperative, narrow sheets of paper may be fed through the machine provided they are so fed as to operate the other latch member as will be readily understood. Thus the machine may be readily adjusted for use in conjunction with narrower sheets of paper whenever desired. Of course where one of the latch members is thus rendered inoperative, the entire strain of stopping the velevation of the impression roller is thrown upon the other latch member and there is also a tendency to tilt said roller, so that, if the feeding of narrow sheets is too long continued, there may. be some yielding of the parts and consequent impairment of the work turned out by the duplicator. However, the narrower sheets are not standard, and therefore not usually employed in very large numbers or for any great length of time, so that the duplicator will ordinarily be able to withstand the unbalanced strains thus introduced for the requisite `limited time. The specic device disclosed is a simple and effective one for the purpose.

While I have illustrated and described the preferred form of construction for carrying my invention into eilect, this is capable of variation and modification without departing from the spirit. of the invention. I therefore do not wish to be limited to the precise details disclosed but desire to avail myself of such variations and modifications as fall within the scope of the appended claims.

I claim as my invention:

1. A duplicator comprising a stencil cylinder; a pair of vertically swinging arms arranged under said cylinder at the ends thereof; an impression roller carried by said arms and cooperating with said cylinder; stops on the sides of said arms; substantially vertically positioned gravity held latches normally engaging said stops to prevent elevation of said impression roller into cooperative relationship with said cylinder, the upper ends of said latches being set in the path of the sides of a paper being fed to said cylinder and roller; and a horizontally swinging release member arranged to contact with each latch to swing and hold it out of the path of the stop on the corresponding impression roller arm.

2. A duplicator comprising a stencil cylinder; a pair of vertically swinging arms arranged under said cylinder at the ends thereof; an impression roller carried by said arms and co-operating with said cylinder; a tension spring attached to each of said arms and arranged to draw said roller toward operative Contact with said cylinder; means for periodically lowering said impression roller; stops on the sides of said arms; substantially vertically positioned gravity held latches normally engaging said stops to prevent elevation of said impression roller into co-operative relationship with said cylinder, the upper ends of said latches being set in the path of the sides of the paper being fed to said cylinder and roller; and a substantially horizontally swinging release member arranged to contact with each latch to swing and hold it out of the path of the stop on the corresponding impression roller arm.

3. A duplicator comprising a stencil cylinder; an impression roller Vcooperating therewith; a latch at each end of said impression roller and located substantially at the plane of the axes of said impression roller and stencil cylinder and preventing operative contact between said cylinder and roller but automatically releasable by passage of a paper between them; 'and an independently operable release member cooperating with each latch to move and hold it in inoperative position. Y i HENRY H1LDEBRANDT-`

Images