EP0179944B1 - Dispositif d'alimentation de supports d'information vers le rouleau d'une machine de bureau - Google Patents
Dispositif d'alimentation de supports d'information vers le rouleau d'une machine de bureau Download PDFInfo
- Publication number
- EP0179944B1 EP0179944B1 EP19840113191 EP84113191A EP0179944B1 EP 0179944 B1 EP0179944 B1 EP 0179944B1 EP 19840113191 EP19840113191 EP 19840113191 EP 84113191 A EP84113191 A EP 84113191A EP 0179944 B1 EP0179944 B1 EP 0179944B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platen roller
- driving
- rotation
- lever
- shaft
- 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
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
- B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
- B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/02—Separating articles from piles using friction forces between articles and separator
- B65H3/06—Rollers or like rotary separators
- B65H3/0661—Rollers or like rotary separators for separating inclined-stacked articles with separator rollers above the stack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/02—Separating articles from piles using friction forces between articles and separator
- B65H3/06—Rollers or like rotary separators
- B65H3/0669—Driving devices therefor
Definitions
- the invention relates to a device according to the preamble of claim 1 and to a method for operating this device.
- the record carriers can be single sheets or envelopes, for example, and are simply referred to below as sheets for simplification.
- a separating device usually has at least one separating roller which frictionally engages the stack of sheets and, as is known, also serves to feed the sheets to the feed nip of the platen roller.
- Such a device is intended to be placed on an office machine, for example on a typewriter or on a typewriter, and is also driven by the drive of the platen roller.
- a feed device of the type mentioned in the preamble of claim 1 is known from DE-A-29 50 707.
- this known feed device between the driver and the shaft of the separating device has a latching lever, a control disk, a driver pin arranged on the control disk, a driver disk and an overrunning clutch connected to it. If it is taken into account that the overrunning freewheel also consists of a number of individual parts, the outlay on connecting elements is relatively great.
- the platen roller has to be reversed three times, with the separating device being driven by the platen roller after the third reversal while the platen roller is running backwards, that is to say counter to the sheet feed direction.
- Such a function means that the sheet that is fed cannot be drawn in by the platen during the feeding process, so that it is stopped at the platen of the platen and bulged out by the feed of the separating device. Only when the platen roller is reversed further in the forward direction is the sheet transported by the platen roller.
- the invention has for its object to reduce the number of connecting elements in a device of the type mentioned.
- the ratchet lever and the ratchet wheel are the only connecting elements required for the drive connection between the driver and the shaft of the separating device.
- An essential feature of this solution is that the clutch engages and entrains the ratchet lever when the platen roller rotates forward after the prerequisite for engagement between the carrier and ratchet lever has been created during a previous reverse rotation of the platen roller.
- a " double reversal of the platen roller is therefore sufficient.
- the feed process is ended by a brief reverse rotation of the platen roller, the driver being disengaged by the latch lever.
- the subsequent rotation of the platen roller for the labeling process remains Driver disengaged from the ratchet lever.
- the solution according to the invention is not only characterized by a low outlay on connecting elements, but also ensures exact positioning of the sheet fed for line-by-line labeling. Since the sheet is fed during a forward rotation of the platen, the sheet is not stopped at the platen nip, but is drawn a short distance into the nip formed by the platen and the first platen. As a result, the sheet is guided not only at its rear section in the conveying direction by guide elements directed towards the feed gap, but also at its leading section in the region of the feed gap. Such guidance ensures control over the leading sheet section even if the guide elements are not directed exactly tangentially to the clamping gap or if the sheet has irregularities on its front edge. In the case of thin sheets in particular, such guidance prevents the leading sheet section from evading.
- the leading sheet section is pushed back in the direction of the feed nip until its front edge, as seen in the conveying direction, comes to a standstill immediately before the nip.
- the leading blade section is under a prestress in the direction of the clamping gap.
- the rollers are driven a little further backwards to ensure that the leading edge of the sheet is actually immediately in front of the nip, even in the event of a possible slippage during the feeding process. Due to the further brief reverse rotation of the rollers, the sheet with its pretensioned leading edge can align parallel to the nip. In this position, the sheet is positioned exactly for the subsequent program-controlled feeding in order to enable line-by-line labeling.
- the angle of rotation can be determined which is used to control the clutch in question direction is required.
- the shaft of the separating device can be rotated freely in both directions of rotation without any drive connection.
- An overrunning freewheel is superfluous and the jack is spared in the raised state. This also ensures that, when disengaged, the platen roller can be set both in forward and in reverse rotation without thereby driving the separating device, unless control of the coupling device in question is desired.
- An embodiment of the ratchet lever according to claim 4 results on the one hand in its pivoting possibility in the direction of the ratchet wheel located in the center when the driver hooks into the indentation, and on the other hand the driver is rejected when it is released and is returned to its starting position by a forward rotation .
- An embodiment according to claims 6 and 7 enables the production of graphic representations on the platen roller, for which purpose it can also be rotated backwards during the “labeling process” without activating one of the coupling devices.
- a coupling device 10 is arranged on a shaft 12, shown in cross section, of a separating device, not shown, which has at least one separating roller connected to the shaft 12 in a rotationally fixed manner.
- a singling roll that engages a sheet stack is assumed to be generally known.
- a ratchet wheel 14 is rotatably connected to the shaft 12. Furthermore, a drive plate 16 is freely rotatably mounted on the shaft 12 and carries a ratchet lever 20 which can be pivoted about a pin 18. A pin 22 arranged on the pawl lever 20 extends through a slot 24 arranged in the driving disk 16. On the other side of the driving disk 16, a tension spring 26, which is braced on a further pin 30 and engages the pawl lever 20 with its pawl 28, engages on the pin 22 disengaged from the toothing 14 'of the ratchet wheel 14. The end of the slot 24 serves as a stop for the pin 22 and thus determines the rest position of the pawl lever 20th
- the shaft 12 is mounted in a bearing 32 of a housing part 34 and is secured against axial displacement to the right by a locking washer 36 resting on the bearing 32.
- the separating roller already mentioned, but not shown, is arranged on the part of the shaft 12 shown broken off.
- a saddle plate 18 serving as a friction brake for the drive plate 16 is arranged on the shaft 12 in order to prevent the drive plate 16 from rotating with the shaft 12.
- a gear 42 serving as a gear element and intended for coupling with a platen roller, not shown, is mounted on a fixed shaft 40 connected to the housing part 34.
- the gear 42 meshes with a drive wheel 44 which is freely rotatably mounted on the shaft of the separating device and which is secured against axial displacement by locking washers 46 and 48.
- the drive wheel 44 On its side facing the drive plate 16, the drive wheel 44 carries a drive 52 which can be pivoted about a pin 50 and which is held in a central position by a tension spring 56 braced on a pin 54.
- the driver 52 has an arm 58 which carries at its free end a driver nose 60 which, as the only element of the driver 52, projects into the plane of the ratchet lever 20, see the broken line in FIG. 2 below.
- the driver 52 When the device is placed on an office machine, the driver 52 is permanently connected to the platen roller, the carrier having the direction of rotation represented by arrow 62 when the platen roller rotates forward. 1, a driver stop 64, which cooperates with the driver nose 60, is arranged on the driver disk 16, the inclined surfaces 64 ′ and 64 ′′ of which force the driver 52 into its central position. With a forward rotation in the direction of the arrow 62 the drive plate 16 dragged over the drive stop 64. This results in a predetermined relative position between the driver 52 and the ratchet lever 20.
- the pawl lever 20 has as an engagement means on its outward side an indentation 66 which is directed opposite the forward direction of rotation 62 and which is intended for engaging the driving lug 60.
- the driving lug 60 With a subsequent forward rotation in the direction of arrow 70 ', the driving lug 60 reaches the bulge 66 of the ratchet lever 20 and pivots it clockwise as shown in FIG. 5 until its pawl 28 engages in the toothing 14' of the ratchet wheel 14 and takes it with it.
- the drive connection is established during a forward rotation of the platen between the platen and the separating device symbolized by the shaft 12.
- the sheet 114 'to be fed is drawn off from the stack 114 by the separating device according to FIG. 7 and fed to the feed nip 118 of the platen roller 116.
- the platen roller is rotated until the front edge of the sheet being fed is gripped by the nip 118 'of the platen roller 116 and drawn in a few millimeters.
- the platen roller is then reversed in the direction of the arrow 72, the driving lug 60 sliding out of the indentation 66 of the ratchet lever 20 and thereby jumping over the deflecting tip 80 of the ratchet lever 20 which has been rotated counterclockwise, see FIG. 6 Forward direction according to the arrow direction 74 in Fig. 3.
- the driving lug 60 slides past the inside of the deflecting tip 80 over the deflecting surface 78 of the pawl lever 20 back to its starting position.
- the sheet 114 'previously completely pushed back from the nip 118' with its front edge is simultaneously finally drawn into the nip 118 'and positioned on the platen roller 116 for writing on.
- Numbers 0 to 13 in FIGS. 4, 5 and 6 denote the line steps of the platen roller which are required for the respective control function.
- the line step 0 denotes the starting position of the driver lug 60.
- a backward rotation by seven line steps is required, see FIG. 4.
- the intervention takes place the driver nose 60 into the bulge 66.
- This one line step is designated in FIG. 1 and in FIG. 3 by 70 '.
- FIG. 6 there is a reverse rotation by four line steps, namely from 6 to 10, in order to ensure safe disengagement.
- FIG. 7 shows a device 110 which enables the supply of recording media 114 from three different magazines 111, 112 and 113. So that the coupling devices 10, 10 'and 10 "assigned to the magazines can be individually controlled, the relative positions between the drivers 52 and the pawl levers 20 are selected differently, for example 7, 10 and 13 line steps.
- the drivers of all the coupling devices are always moved. However, only the driver whose relative position corresponds to the number of the turned-back line steps engages in the ratchet lever 20. If, for example, the third coupling device 10" controlled, then the drivers of the two first coupling devices 10 and 10 'slide over the outer flanks 76 of the pawl levers 20 without engagement.
- the platen roller 116 shown in section in FIG. 7 forms, together with a first pressure roller 120, the nip 118 '.
- the second pressure roller is designated by 122.
- the platen roller 116 is driven by a controllable drive 126 via gear elements 124.
- the drive 126 is usually program-controlled, the required angles of rotation for controlling the desired coupling devices and for the further control processes being stored. For example, the different paths from the magazines to the platen roller must be taken into account in the control.
- the feed paths of the sheets from the magazines 111, 112, 113 to the platen roller 116 are limited by guide elements 128, 128 ', 128 ", which are preferably designed in such a way that they inhibit a reverse transport of the sheets. Such an inhibition is desirable so that when the leading sheet section is pushed back out of the clamping gap 118 'immediately before the clamping gap, viewed in the conveying direction, forms a tension 130 sufficient for the subsequent final insertion into the clamping gap.
- the sheet 114 'previously gripped by the rollers can align itself with its front edge exactly parallel to the clamping gap 118'.
- the sheet that is under tension is positioned exactly at the nip, so that during the subsequent transport in the forward direction, a line-precise loading writing is guaranteed.
- the coupling device 10 is connected to the platen roller 116 via a toothed wheel 42.
- the two further coupling devices 10 'and 10 are each connected to the drive wheel 44 and 44' of the preceding coupling device via gear wheels 132 and 132 '.
- each reverse rotation of the platen causes the gear 42 and the drive wheel 44, which carries the driver 52, to rotate (FIG. 3).
- the drive plate 16 carrying the pawl lever 20 has an approximately helical deflection curve, generally designated 140, for the drive lug 60 of the drive 52.
- this curve 140 extends over a little more than 360 °. Since the extension of the curve shows the possible way to work when «plotting», i. H. determines the length of the sheet section that can be used for this purpose, it may be expedient for the curve to be helical over several rounds, for. Ex. 1 080 ° to extend. It is also possible to design the extension of the screw exactly in accordance with the possible working length for a predetermined blade length.
- the curve 140 has run-up surface parts 142 and 144 which face each other and delimit a narrowing path 146. Finally, a driver stop is formed at the inner end of the curve by the surfaces 148 and 150, which corresponds to the driver stop 64 of the exemplary embodiment according to FIG. 2 in terms of function and general shape.
- the driver 52 with its driver nose 60 has passed over the ratchet lever 20 on its outward side 76.
- the driving lug 60 has reached the run-up surface 142 and has been deflected outward there again against the action of the spring 56. If the drive wheel 44 now rotates further backwards, the driver nose runs out on the curve 140 and can cover a path along this, corresponding to a full revolution.
- the corresponding recording process can begin and, if necessary, can proceed without further reversal of the direction of rotation until the driving lug has again come into the vicinity of the run-up surface 142. Regardless of whether the platen moves forward or backward or generates corresponding movements of the drive wheel, an undesired engagement of the driving nose on the ratchet lever is avoided as long as the nose is within the effective range of curve 140.
- the driving lug 60 is moved past the inner deflecting surface 78 of the ratchet lever 20 into the starting position at the driving stop 148, 150 during the subsequent forward rotation of the drive wheel 44. This restores the readiness to initiate a new sheet feed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Handling Of Sheets (AREA)
- Handling Of Cut Paper (AREA)
Claims (8)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19840113191 EP0179944B1 (fr) | 1984-11-02 | 1984-11-02 | Dispositif d'alimentation de supports d'information vers le rouleau d'une machine de bureau |
DE8484113191T DE3479305D1 (en) | 1984-11-02 | 1984-11-02 | Device for feeding record carriers to the platen of an office machine |
US06/793,897 US4717136A (en) | 1984-11-02 | 1985-11-01 | Process and apparatus for feeding in of recording carriers to the writing roller of an office machine |
US07/069,965 US4909498A (en) | 1984-11-02 | 1987-07-06 | Process and apparatus for feeding in of recording carriers to the writing roller of an office machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19840113191 EP0179944B1 (fr) | 1984-11-02 | 1984-11-02 | Dispositif d'alimentation de supports d'information vers le rouleau d'une machine de bureau |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0179944A1 EP0179944A1 (fr) | 1986-05-07 |
EP0179944B1 true EP0179944B1 (fr) | 1989-08-09 |
Family
ID=8192261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840113191 Expired EP0179944B1 (fr) | 1984-11-02 | 1984-11-02 | Dispositif d'alimentation de supports d'information vers le rouleau d'une machine de bureau |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0179944B1 (fr) |
DE (1) | DE3479305D1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3512419A1 (de) * | 1985-04-04 | 1986-10-16 | Helmut Steinhilber | Vorrichtung zum zufuehren von einzelblaettern zur schreibwalze eines druckers |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE297039C (fr) * | ||||
CH493889A (de) * | 1968-07-17 | 1970-07-15 | Zentronik Betr Karl Marx Stadt | Einrichtung zum Bearbeiten von Magnetkarten |
DE2950707C3 (de) * | 1979-03-20 | 1981-12-10 | Helmut 7210 Rottweil Steinhilber | Vorrichtung zum Zuführen von Einzelblättern von einem in einem Magazin gespeicherten Papierstapel zur Schreibwalze einer Büromaschine |
JPS5895041A (ja) * | 1981-11-30 | 1983-06-06 | Konishiroku Photo Ind Co Ltd | 給紙装置 |
JPS5939574A (ja) * | 1982-08-30 | 1984-03-03 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | ベイル開閉装置 |
US4475731A (en) * | 1982-12-17 | 1984-10-09 | Centronics Data Computer Corp. | Programmable, mechanical system for feeding cut sheet paper to a printer |
-
1984
- 1984-11-02 EP EP19840113191 patent/EP0179944B1/fr not_active Expired
- 1984-11-02 DE DE8484113191T patent/DE3479305D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0179944A1 (fr) | 1986-05-07 |
DE3479305D1 (en) | 1989-09-14 |
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