Патент USA US2404861код для вставки
July 30, 1945. E. F. PYETSCHAUER 7 2,404,861 PAGE END INDICATOR FOR TYPEWRITERS Filed April 17, 1945 ATTORNEYS Patented July 30,1946 2,404,861 i' UNITED STATES PATENT OFFICE * 2,404,861‘ I PAGE‘END' mmcA'roR FOR TYPEWRITERS ‘ Edward F. Petschauer, Cleveland, Ohio’ > ‘ Application April 17, 1945, Serial No. 588,854 5 Claims‘ (Cl. 197—189) H The present invention relates to new and use , _, . , means of a bearing sleeved secured to'theframe. ful ‘improvements in page end indicators for An annular member or disc 9 is rotatably typewriters embodying an audible signal, such as a bell,gan'd mechanism to sound the bell when a mounted on the sleeve and‘ is formed with a spiral predetermined point in the work sheet has been reached, such as the end of the page. 'An important object of the present invention is, to provide a page end indicator adapted to notify and warn the operator of the machine thatthe end of the page is reached or ap proached, thus eliminating the necessity of the operator dividing his attention between the work in ‘ ‘ ' _‘ l0. ‘l ‘ g ' ‘ ‘ " angularly and inserted in the groove [0 while the ' other end of the traveler indicated at I2 extends transversely through ‘an opening in» the’ shaft to and the‘ progress of the paper feeding, and also assuring a uniformity in appearance of the work sheet. groove Av traveler or followerv H has one end’ bent v More speci?cally, the invention comprises ‘an annular member adapted for attaching to the for slidable movement therein, the traveler" It also extending through a sleeve section Bw'fse ‘cured to the shaft forrotation therewith. - A clapper !3 is pivoted to one side of‘_ the disc 9 with the end of the clapper held in‘ engage‘ ment with a bell l4 by‘means of a coiYspring 15, said bell being secured to the sleevetw ‘ ; ‘As‘indicated in Figure 2 ‘ of the drawing, the clapper extends across or ‘transversely of A‘ the platen shaft of the typewriter and held against groove it at its outer end‘ in the-path‘ offthe traveler H so that upon the‘travele‘r reaching rotation and having a spiral groove formed therein with a follower arranged to travel in the 20 the outer end of the spiral groove, the‘clapper will be engaged for moving the same into con groove and rotated with the shaft and adapted to actuate a bell clapper when the follower or traveler reaches the end of the groove, the groove being of a length substantially to‘ correspond to the‘ length of a sheet of paper mounted on the platen of the typewriter. A further object isytoprovide a device of this character of simple and practical construction, whichis ef?cient and'reliable in operation, which tact with the bell to sound the alarm. '- ~ _ A coil spring I6 is mounted-- on" the shaft with one end connected to the disc 9- and its other end inserted in the shaft 5 and the disc is held stationary against rotation by'the tension of the spring l6 by means of va dog ll‘ engaging the toothed edge l8 of the disc, the dog being carried at and extending downwardly from one may be easily and quickly mounted in position 30 end‘ of a; pivoted arm 19 attached to the upper on a typewriter without necessitating any ma terial changes in construction or alterations therein; and‘ which otherwise is well adapted for the purposes for which the same is intended. Other objects and advantages reside in the portion of the frame ‘I, the‘ other end of the arm having (a ‘key 20 projecting ' upwardly- therefrom, whereby a depressing movement-‘of the key- will details of construction and operation as more . cause the raising of the dog ll out of engage ment with the teeth l8 of the disc and permit rotation of the disc under the influence of the fully hereinafter described and claimed, refer spring Hi. ence being had to the accompanying drawing forming part hereof, wherein like numerals refer The end of the arm I!) provided with the dog I‘! is off balance so that the dog will normally to like parts throughout, and in which: 40 gravitate into engaging position with the teeth is of the disc. Figure 1 is a fragmentary elevational view of In the operation of the device, a sheet of paper one end of a typewriter platen and with the is placed in the typewriter under the platen 5 alarm device mounted thereon and shown in into typing position and the key 20 is depressed, section. Figure 2 is a transverse sectional view taken 45 whereby the dog I‘! will be released from the teeth I8 of the disc and the spring It will rotate substantially on a line 2--2 of Figure 1. the disc in a direction to move the traveler I l Figure 3 is a top plan view. into a position at the inner endof the spiral Figure 4 is an enlarged detail of the clapper groove in and the typing proceeded with in its for the bell. ' Referring now to the drawing in detail, where 50 usual manner. The rotation of the platen 5 during the pro in for the purpose of illustration I have disclosed gressive feeding of the paper therethrough will a preferred embodiment of the invention, the cause the traveler l l to move from the inner end numeral 5 designates the typewriter platen and of the spiral groove Ill toward the outer end the numeral 6 represents the platen shaft jour naled in a carriage frame ‘I of the typewriter by 55 thereof, the time required for the traveling of 2,404,861 4 the traveler II from the inner end to the outer end of the groove being substantially equal to the time required for a sheet of paper to be fed through the machine. adapted .to engage and actuate the clapper upon reaching the outer end of the guide, spring means for rotating the disk to return the traveler to the inner end of the guide, said disk having a toothed edge, and a manually operable dog en groove, the clapper I3 will be actuated to strike gaging the teeth to secure the disk against ro the bell l4 and thus sound the alarm to indicate tation. that the end of the sheet of .paper has been 3. A page end alarm for typewriters compris reached. ing in combination a platen shaft, a disk freely As indicated in Figure 4 of the drawing, the 10 mounted on the shaft and having a spiral groove clapper" includes ashank l3a having a pivoted therein, a bell surrounding the disk, a clapper for inner spring biased extension l3b adapted to the bell and disposed transversely of the groove actuate'the clapper upon engagement by the at its outer end, a traveler connected to the shaft traveler, the extension swinging backwardly with for rotation therewith and radial movement with the traveler when the latter is reset. 15 respect thereto, said traveler traveling in the In view of the foregoing description, taken in ‘groove and adapted to engage and actuate the ' As the traveler approaches the outer end of the conjunction with the accompanying drawing, it clapper upon. reaching the outer end of the is believed that a clear understanding of the groove, spring means for rotating the disk to re construction, operation and advantages of they turn the traveler to the inner end of the groove, article will be quite apparent to those skilled in 20 and means securing the disk against idle ro theart. A more detailed description thereof is accordingly deemed unnecessary, tation. , _ ’ _ a 4. A page ‘end alarm for typewriters compris ing in combination a platen shaft, a ‘diskfreely , It ‘is to be understood, however, that even though I have herein shown and described a mounted on the shaft and having a spiral groove preferred embodiment of my invention, the same 25 therein, a bell surrounding the disk, a clapper, for is susceptible to certain changes fully compre the bell and disposed transversely of the groove hended by the spirit of the invention as herein described, and the scope of the appended claims. for rotation therewith and radial movement with at its outer end, a traveler connected to the shaft respect thereto, said traveler traveling in the Having thus described the invention, what I claim, is? . ‘ 30 - 1. A page end alarm for typewriters compris ing in combination a platen shaft, a disk freely mounted on the shaft and having a spiral guide on‘ one of its faces, a bell surrounding the disk, groove and adapted to engage and actuate the clapper upon reaching the outer end of the groove, spring means for rotating the’ disk to re turn the traveler to the inner end of the groove, said disk having a toothed edge, and amanually a clapper for the bell and disposed transversely 35 operable dog engaging the‘teeth to secure the disk against rotation. ' . ' ' ' ofthe guide at its outer end, a traveler carried by the shaft for rotation therewith and radial 5. A page end alarm for typewriters compris movement with respect thereto, said traveler “en ing in combination a platen shaft, a disk freely mounted on the shaft and having a spiral groove ' gaging the guide for movement thereon and adapted to engageand actuate the clapper upon 40 therein, a bell surrounding the disk, a clapper reaching the outer end of the guide, spring means for rotating the disk to return the traveler to the inner end of the guide, and means securing for the bell and disposed transversely of the groove at its outer end, aftraveler connected to the shaft for rotation therewith and radial move the disk against rotation. ‘ment with respect thereto, said traveler travel _ 2. A page end alarm for typewriters compris 45 ing in the groove and adapted to engage and prising in combination a platen shaft, a disk actuate the clapper upon reaching the outer. end freely mounted on the shaft and having a spiral of the grove, spring means for rotating the disk guide‘ on one of its faces, a bell surrounding the to return the traveler to the inner end of the disk, a clapper for the bell and disposed trans groove, said disk having a toothed edge,and a key ' versely» of the guide at its outer end, a traveler 50 operated dog engaging the teeth to secure-the slidably mounted transversely of the Shaft for disk against rotation. ' » rotation therewith and including an angular end engaging the guide for movement thereon and EDWARD F. PETSCHAUER.