UNITED STATES PATENT OFFICE
SLIP SHEETER ATTACHMENT FOB
Bernard Ferrar, Los Angeles, Calif.
Application May 10,1949, Serial No. 92,280
6 Claims. (CL 101—419)
The present invention relates generally to slip sheeter attachments for stencil duplicators, and more particularly, to an attachment of this type which is adapted to have its operation discontinued automatically when the operation of the duplicator to which it is attached is discontinued.
Slip sheeters generally are well known in the art, and accordingly, do not need to be described in detail herein. The purpose of a slip sheeter attachment is to introduce a slip sheet or heavy sheet of cardboard or similar material, between each printed sheet ejected by the duplicator and the next successive sheet whereby to prevent transfer of ink between wet sheets. The usual practice is to provide a tray of slip sheets supported immediately above the receiving tray at the back of the duplicator, which slip sheet tray is constructed and arranged to drop the lowermost of the slip sheets in the stack down into the receiving tray on top of each printed sheet as it is ejected. One device adapted for this purpose is illustrated and claimed in my patent, No. 1,916,723, issued July 4, 1933, and entitled Improvement in Slip Sheeters.
The particular problem dealt with herein is that of discontinuing the operation of the slip sheeter mechanism whenever the actual printing of sheets by the duplicator is interrupted. It is the usual practice in most duplicators, particularly those which are power-driven, to first start the drive mechanism which involves the printingelements, i. e., stencil and impression rollers, for the purpose of making various preliminary adjustments of the machine, and thereafter engaging the feed mechanism which feeds the blank sheets into the duplicator to receive their impression.
The slip sheeter attachment employed with such machines is mechanically linked to the aforesaid drive mechanism, and so conventionally, unless special means are provided, the slip sheeter mechanism operates immediately that the duplicator is started. Thus, the machine with its attachment will immediately commence the operation of the slip sheeter to drop slip sheets into the receiving tray whether paper is then being fed through the duplicator or not.
Accordingly, it is a major object of the present invention to provide a slip sheeter attachment in which the members linking the mechanical movement of the duplicator with the mechanical movement of the slip sheeter includes a disengageable element responsive to the paper feed
mechanism and/or the actual printing elements in the duplicator.
Another object of the invention is to provide a mounting for a slip sheeter attachment which permits easy and rapid detachment of the slip sheeter mechanism from the duplicator, and also permits the same to be lifted for the purpose of removing printed sheets and slip sheets from the receiving tray.
Still another object of the invention is to provide a slip sheeter attachment which may be readily attached to the duplicator without the use of special tools, and without substantial modification of the duplicator structure.
The foregoing and other objects and advantages of the invention will be apparent from the following detailed description of two forms thereof, such consideration being given likewise to the attached drawings, in which:
Figure 1 is a side elevational view of a stencil duplicator having attached thereto a slip sheeter mechanism embodying one form of the invention;
Figure 2 is a fragmentary, elevational view similar to- the left-hand portion of the device 25 shown in Figure 1, but showing the slip sheeter attachment in a raised position;
Figure 3 is an elevational sectional view taken on the line 3—3 in Figure 1;
Figure 4 is a fragmentary section taken on the 30 line 4—4 in Figure 1, showing the means for supporting and feeding the slip sheets;
Figure 5 is an elevational view looking outwardly from inside the duplicator illustrated in Figure 1, and illustrating portions of the linkage 35 mechanism connecting the duplicator and the slip sheeter attachment;
Figure 6 is a partially sectioned view taken on the line G—6 in Figure 5;
Figure 7 is a fragmentary elevational view 40 similar to Figure 5, but showing the parts in a disengaged position;
Figure 8 is a horizontal sectional view taken on the line 8—8 in Figure 7;
Figure 9 is a fragmentary elevational view of 45 a duplicator and slip sheeter attachment embodying a modified form of the invention, a part of the duplicator being broken away to reveal underlying parts;
Figure 10 is an elevational view looking outward 50 form inside of the duplicator of Figure 9, further illustrating the parts of the linkage interconnecting the duplicator and slip sheeter attachment; and
Figure 11 is a partially sectioned view taken 55 on the line II—11 in Figure 10.