US3065961A - Safety trip means for sheet feeding mechanism - Google Patents
Safety trip means for sheet feeding mechanism Download PDFInfo
- Publication number
- US3065961A US3065961A US50106A US5010660A US3065961A US 3065961 A US3065961 A US 3065961A US 50106 A US50106 A US 50106A US 5010660 A US5010660 A US 5010660A US 3065961 A US3065961 A US 3065961A
- Authority
- US
- United States
- Prior art keywords
- sheet
- fingers
- lay
- lays
- trip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/20—Safety devices preventing damage
Definitions
- This invention relates to mechanism for feeding paper or other sheets one at a time from a stack thereof, and refers particularly to stream feeders of the kind commonly used in high speed printing machines for supplying paper sheets in overlapped relationship.
- the leading sheet of the stream is disposed so far forwardly of its correct position that it passes below the lays while the latter are raised, in which case it may pass in a folded or crumpled condition into the nip of the impression cylinder or two or more sheets may pass thereinto, and in either case, the machine may be seriously damaged as the aforesaid known trip mechanism serves only to stop the feeder in the case of an under-run of the sheets and not in the case of an overrun thereof.
- the said known under-run trip device comprises a transversely extending trip spindle arranged somewhat above and rearwardly of the lay bar so that the stream of sheets pass below 4the said spindle before reaching the gripper lays.
- This trip spindle is provided with two or more depending arms, each having a finger pivotally connected to its free lower end. These fingers extend forwardly, that is, towards the lays, and the free ends thereof are bent downwardly so as to rest on and slide over the surface of a sheet of paper when the latter is in contact with the gripper lays, at which time the forward portion of the sheet rests on and is supported by a transversely extending bar in the usual way.
- the trip spindle is oscillated in timed relation with the feeder in such a manner that the free ends of the fingers slide over the sheet at the leading end of the stream and towards the lay edge of the said sheet immediately after the latter has compelted its forward movement, at which time it should be in contact with the griper lays. If however the said leading sheet is underfed so that it does not reach the lays, the said fingers in moving forwardly, pass over the lay edge of the sheet onto the said supporting bar and drop into corresponding slots formed therein. The trip spindle is thus prevented from completing its full movement so that associated mechanism operates to stop the feeder until an appropriate adjustment is made.
- the sheet If however the sheet is in contact with the lays, it covers the said slots so that the trip mechanism does not operate. The same is also true if the sheet should over-run the lays so that it does not protect the machine against the risk of damage from this cause.
- the invention includes safety means for association with sheet feeding mechanism, comprising at least one over-run detecting finger, means operable for moving the said fingerin timed relationship with the sheet feeding mechanism is a path intersecting the path of edarent vancement of sheets by said sheet feeding mechanism and directly forward of the position of a correctly advanced sheet, and control means operable in response to obstruction of the movement of said finger.
- the control means may be utilised to stop the machine being fed by the sheet feeding mechanism, and/ or to release pressure on the printing machine roller, and/or it may be utilised to stop the operation of the feeding mechanism.
- the invention may comprise one or more over-run detecting fingers and means operable in timed relation with the feeder to raise and lower the said fingers immediately in front of the lays, and means operable if the downward movement of the fingers is obstructed to stop the operation of the feeder, and preferably of the machine as well.
- the said fingers are free to descend, whereas, if the sheet has over-run the lays, it is disposed in the path of downward movement of the fingers so as to arrest the latter.
- the said fingers are preferably pivotally mounted and are actuated in such a manner that they are positively moved in the upward direction only.
- each of the said over-run fingers is preferably pivotally connected to the oscillatable lay bar and are arranged to be raised and lowered thereby, and to close corresponding switches in a control circuit if they fail to complete their downward movements, the said switches when operated, serving to stop the machine.
- control switches are preferably connected in circuit with a further switch which is closed only when the lays are down.
- FIGURE 1 is a plan view of part of a sheet feeding mechanism embodying the safety trip means according to this invention
- FIGURE 2 is a perspective view of part of the trip means
- FIGURE 3 is a view in sectional side elevation illustrating the operation of the trip means when sheets of paper are feeding correctly
- FIGURE 4 is a view in section on line 4--4 of FIG- URE l, showing a switch in closed position
- FIGURE 5 is a view similar to FIGURE 4 showing the switch in open position
- FIGURE 6 is a view corresponding to FIGURE 3 showing the position of an over-run finger and associated parts in disengaged position
- FIGURE 7 is a view similar to FIGURE 3 showing the operation of the safety trip means when a sheet of paper has been advanced beyond the correct position
- FIGURE 8 is a diagram of he circuit means for interrupting the sheet feeding.
- the drawings illustrate part of a sheet feeding mechanism comprising two side plates 11 which support in bearings a lay bar 1 2 and a trip spindle 13
- the trip spindle and lay bar extend horizontally and parallel to each other, the trip spindle being raised above the lay bar and being disposed rearwardly thereofie. towards the direction from which sheets of paper are advanced by the feeding mechanism.
- the feeding mechanism forms n part of this invention, and for simplicity it will not be described.
- the trip spindle 13 carries two depending arms 14 each of which has a boss 15 through which the trip spindle is inserted.
- the bosses 15 are secured to the trip spindle 13 by set screws 16 so that the arms 14 are spaced laterally from each other by a suitable distance.
- Each depending arm 14 is provided at its lower end with a laterally extending pivot pin 17 on which is mounted a block 18.
- the blocks 18 each carry a finger 19 fixed to the block and extending forwardly i.e. towards the lays of the machine.
- the free ends 20 of the fingers 19 are bent downwardly so that they may rest on and slide over the surface of a sheet of paper 21 supported on a transversely extending bar 22.
- Each of the depending arms 14 carries a leaf spring 23 fixed to a lug 24 on the arm and engaging a projection 25 on the block 18. This spring serves to urge the finger 19 downwardly.
- the additional mechanism which is -provided by this invention to achieve this purpose comprises two blocks 27 attached to the lay bar 12. Each block 27 is bored to receive the lay bar 12 and is split diametrically, the two halvesof the block being secured together by screws 28 whereby the blocks can be clamped on the lay bar at suitable positions. Each block 27 is clamped approximately in alignment with one of the under-run detecting fingers 19.
- Each block 27 carries a smaller block 30 (hereinafter termed a rocker) which is pivotally supported on the block by means of an integral spigot extending into a bearing hole in the block 27 para'lel to the axis of the lay bar 12.
- Each rocker 30 has an integral rearwardly projecting tail 31 and each rocker also carries an over-run finger 32 comprising a length of rod inserted through a hole in the rocker and fixed to the rocker by a grub screw 29.
- Each finger 32 is bent so that it extends upwardly over the lay bar, and has a straight intermediate portion which can rest on the lay bar and extend downwardly and forwardly as illustrated in FIGURE 3, when the lay bar is in the angular position shown in FIGURE 3.
- each over-run finger 32 is inclined downwardly, so that it will rest on a sheet of paper if a sheet is disposed below it.
- the lay bar is shown in its extreme forward angular position. During the operation of the mechanism the lay bar is oscillated rearwardly from this position to that shown in FIG- URE 6, and it will be evident from this figure that in moving the -partial rotationA of the blocks 27 causes' thev fingers 32 to be raised well clear of the advancing sheets of paper.
- the fingers 33 are provided with tension springs 34 connected between them and pins 35 on the blocks 27. The springs 34 thus urge the fingers 32 to remain in contact with the lay bar 12, but permit them to be lifted from it if they strike an obstruction.
- ⁇ the fingers 32 are of such a length that when the lays are lowered and the lay bar 12 is in its extreme foremost position the ends of the fingers 33 are disposed below the plane of the top of the bar 22. Hence if the sheet 21 over-runs the lays, the fingers 32 engage the leading end of the sheet 21 and are arrested by it. In these circumstances, the fingers 32 remain stationary on the sheet 21 during the final descending movement of the lays.
- Each split block 27 has fixed to it a plate 36 of insulating material carrying a contact spring 37 which extends forwardly over the corresponding over-run finger 32 with its forward end in proximity to the finger whereoy the finger makes contact with the spring 37 if it is held stationary by a sheet of paper during the final descending movement of the lays.
- a terminal 38 is mounted on the plate 36 in electrical Contact with the spring 37, and a. second terminal 39 is mounted on the plate 36 in electrical contact withthe block 27. Hence when the finger 32 contacts the leaf 37 it completes an electrical circuit between the terminals 3S and 39.
- the mechanism also includes a switch 40 fixed to one of the side plates 11 and having an operating arm 41 which projects rearwardly therefrom.
- a lever 42 is fixed to the lay bar 12 so as to extend rearwardly therefrom and is arranged so that in the extreme forward position of the lay bar 12 shown in FIGURE 4, the lever 42 engages the arm 41 and holds it in a position to close the contacts of the switch 40.
- the switch 40 is arranged so that when the arm 41 is not urged upwardly by the lever 42 the switch contacts are open.
- the switch means provided by the fingers leaves and terminals of each block 27 are connected in parallel with each other and in series with the switch 40 in an electrical control circuit which is arranged to stop the machine.
- the machine in question is commonly provided with a safety switch 101 (see FIG.
- This safety switch 101 operates to close an electrical circuit 102 which is used to stop the machine, and therefore the circuit of the switch 40 and the associated finger operated switches described above may be connected in parallel arrangement with this existing safety switch 101 to operate the same SOP- ping mechanism in the event of a sheet over-running the lays.
- the safety means illustrated also includes means for actuating the under-feed trip mechanism if either of the over-run fingers 32 fails to complete its downward movement.
- the additional mechanism comprises a pawl 43 pivotally mounted on the spigot of each rocker 30 and extending rearwardly'therefroni.- Each'pawl 43'is arl' ranged to rest slidably on the upper surface of a stop plate 44 extending laterally from the corresponding depending arm 14. Each pawl 43 is provided on its lower surface, forwardly of its rear end, with a rearwardly facing shoulder 45 disposed in the path of movement of the forward edge of the corresponding stop plate 44.
- Each pawl 43 has a laterally projecting lug 46 carrying an adjustable stop screw 47 the end of which is disposed to engage the upper surface of the rearwardly projecting tail 31 of the rocker 30.
- Each of the screws 47 is normally adjusted so that when the lay 'oar is inthe forward position shown in FIGURE 3, and the paper is being fed correctly so that the over-run fingers 32 are also positioned as shown in FIGURE 3, the tail 31 of each rocker 30 holds the corresponding pawl 43 (through the agency of the screw 47) so that the shoulder 45 is clear of the stop plate 44.
- the pawls do not prevent the depending arms 14 and the trip spindle 13 from completing their forward movements.
- the invention therefore provides trip mechanism which operates automatically to stop the machine and prevent damage thereto in the event of the over-feeding of a sheet, and also to stop further feeding of paper in the same circumstances.
- the mechanism is simple and comparatively inexpensive and can be easily and quickly fitted to existing machines of the aforesaid kind making use of existing stop and trip mechanism incorporated therein.
- a sheet feeding device for printing machines a safety mechanism having a lay shaft, means for oscillating said lay shaft in timed relation to the operation of the printing machine, means partaking in the oscillations of said lay shaft for detecting sheets incorrectly positioned by the said feeding device, and means actuated by the said detecting means for interrupting the feeding of the sheets
- said means including a block on and turnable with the lay shaft, a pivot pin on said block rearwardly of said lay shaft, a feeler-finger extending forwardly and capable of limited turning movement on said pivot pin in relation to said lay shaft, said finger having a downwardly projecting end portion, resilient means normally urging said finger so as to protrude with its downwardly projecting end portion into contact with the edges of the advancing sheets, means operable by the said finger for stopping the oscillation of said lay shaft and, thereby, arresting the feeding of the sheets when the downward movement of the finger becomes interrupted by its end portion striking the leading part of an overfed sheet, an electric terminal mounted on the rlinger-support
- a safety mechanism having a lay shaft, means for oscillating said lay shaft in timed relation to the operation of the printing machine, means partaking in the oscillations of said lay yshaft for detecting sheets incorrectly positioned by the said feeding device, and means actuated by the said detecting means for interrupting the feeding of the sheets
- said means including a block on and turnable with the lay shaft, a pivot pin on said block rearwardly of said lay shaft, a feeler-iinger extending forwardly and capable of limited turning movement on said pivot pin in relation to said lay shaft, said nger having a downwardly projecting end portion, resilient means normally urging said iinger so as to protrude with its downwardly projecting end portion into contact with the edges of the advancing sheets, means -operable by the said finger yfor stopping the oscillation of said lay shaft and, thereby, arresting the feeding of the sheets when the downward movement of the finger becomes interrupted by its end portion striking the leading part of an overfed sheet, an electric switch on the lay
Landscapes
- Controlling Sheets Or Webs (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU51967/59A AU239882B2 (en) | 1959-08-20 | Safety trip means for sheet feeding mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US3065961A true US3065961A (en) | 1962-11-27 |
Family
ID=3738317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US50106A Expired - Lifetime US3065961A (en) | 1959-08-20 | 1960-08-17 | Safety trip means for sheet feeding mechanism |
Country Status (3)
Country | Link |
---|---|
US (1) | US3065961A (de) |
DE (1) | DE1146074B (de) |
GB (1) | GB944288A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147970A (en) * | 1962-09-07 | 1964-09-08 | Sperry Rand Corp | Document transport and stacking device |
US4638989A (en) * | 1984-09-03 | 1987-01-27 | Sharp Kabushiki Kaisha | Device to prevent transport of poorly aligned copy paper |
US5694849A (en) * | 1994-11-30 | 1997-12-09 | Heidelberger Druckmaschinen Ag | Overshooting-sheet safety device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0312761Y2 (de) * | 1985-01-22 | 1991-03-26 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2165535A (en) * | 1936-04-13 | 1939-07-11 | Addressograph Multigraph | Printing machine |
US2395740A (en) * | 1944-06-06 | 1946-02-26 | Carnegie Illinois Steel Corp | Sheet feeding device |
US2634972A (en) * | 1947-11-10 | 1953-04-14 | John Confort | Sheet collating machine |
US2709960A (en) * | 1950-10-26 | 1955-06-07 | Roland Offsetmaschf | Detecting device for machines working on sheets |
US2721737A (en) * | 1952-05-23 | 1955-10-25 | Hammer | Collating machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE496374C (de) * | 1930-04-17 | Hermann Roth | Elektrisch betriebene Vorrichtung zum selbsttaetigen Abstellen der Bogenzufuehr-vorrichtung oder des Druckzylinders einer Druckmaschine beim Ausbleiben der Bogen | |
FR1120419A (fr) * | 1955-03-09 | 1956-07-05 | Ahlen & Akerlunds Forlags Akti | Dispositif pour le contrôle de la position d'un matériau en forme de feuille ou de plaque sur un support |
-
1960
- 1960-08-17 US US50106A patent/US3065961A/en not_active Expired - Lifetime
- 1960-08-19 DE DEM46315A patent/DE1146074B/de active Pending
- 1960-08-22 GB GB28915/60A patent/GB944288A/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2165535A (en) * | 1936-04-13 | 1939-07-11 | Addressograph Multigraph | Printing machine |
US2395740A (en) * | 1944-06-06 | 1946-02-26 | Carnegie Illinois Steel Corp | Sheet feeding device |
US2634972A (en) * | 1947-11-10 | 1953-04-14 | John Confort | Sheet collating machine |
US2709960A (en) * | 1950-10-26 | 1955-06-07 | Roland Offsetmaschf | Detecting device for machines working on sheets |
US2721737A (en) * | 1952-05-23 | 1955-10-25 | Hammer | Collating machine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147970A (en) * | 1962-09-07 | 1964-09-08 | Sperry Rand Corp | Document transport and stacking device |
US4638989A (en) * | 1984-09-03 | 1987-01-27 | Sharp Kabushiki Kaisha | Device to prevent transport of poorly aligned copy paper |
US5694849A (en) * | 1994-11-30 | 1997-12-09 | Heidelberger Druckmaschinen Ag | Overshooting-sheet safety device |
Also Published As
Publication number | Publication date |
---|---|
DE1146074B (de) | 1963-03-28 |
GB944288A (en) | 1963-12-11 |
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