DE2260909C2 - Device for feeding individual sheets to a processing device - Google Patents

Description

The invention relates to a device for feeding individual sheets / u a processing device, in particular Copier, two stacks of sheets are provided separately in a storage container, according to the preamble of claim 1.

From US Pat. No. 3,645,615 a feed device is known in which the sheets are fed individually to the processing device from several stacks of paper over several paths and several pulling and feeding mechanisms. The disadvantage of such an arrangement is the use of a pull-off and feed device for each individual stack of paper and the presence of a feed path for each stack of paper sheets.
An arrangement which at least partially does not have these disadvantages is known from DE-OS 21 27 331. This device relates to a device for evaluating information carriers, such as so-called microfilm cards in particular, which are stored in two memories

ίο are arranged and di <; by means of a transport device be fed to a projection station. The microfilm cards are in the two stores came up on one of their long edges and are replaced by a joint located between the memories reversible drive-beard pull-off roller withdrawn. The pull-off roller is in a movable suspension stored, which is selectively movable on one or the other selected stack. With this well-known Arrangement in which both memories have the same size, the microfilm cards of one Memory led to the projection device and from there after processing in the other memory transported back. It is also possible that the cards can be transported directly from one memory to the other without the microfilm card enters the common projection station. A turning device is provided beforehand for this purpose. at this known arrangement is an optional withdrawal or supply from the one stack or

ω not possible for the other stack in such a way that both stacks are filled with information carriers or sheets. The known arrangement is based on the Separation and re-collection of film punch cards of the same size coordinated, which was also before the Projection station makes lying intermediate compartment necessary, so that no different sized film punch cards are to be handled correctly. In addition, this known arrangement is structurally different complicated that the entire storage including the suspension of the pulling roller either on the one Stack or must be moved to the other stack.

It is the task of the present invention. starting from a device according to the preamble of claim 1, a structurally simplified separating device to create that is also even more flexible in its usability.

This: Object is according to the invention in principle through the application of the in the characterizing part of Claim 1 lowered features solved.

Advantageously, this is one in the Constructed a simplified peeling device between two stacks, which is flexible enough. around to be able to pull off sheets of different sizes.

Advantageous refinements and developments the device according to the invention are contained in the subclaims, some features from the above-mentioned DE-OS 21 27 317 are known per se.

In the following, the structure and we kungswisise of the device according to the invention is explained in more detail using the exemplary embodiment shown in the figures. The figures show in detail
P i g. 1 shows a perspective view of a copier with a single sheet feed device;

F i g. 2 is a perspective view of the paper stack holder and the feed and transport device;
Fig.3 is a top view of the shown in Fig.2

Parts;

F i g. Figure 4 is a side view of the retractor and advance mechanism;

F i g. 5 and 6 schematically in plan view the various positions of the extraction and feed mechanism; ■>

F i g. 7 is a view from below of the FIG. 4 parts shown;

Fig. 8 is a plan view of the pulling and advancing mechanism in an intermediate layer and

9 shows a block diagram of the control for the in Feeding device.

In Fig. 1 is next to a copier 10, a paper feed device 12 is shown, which in a Housing 14 is mounted on a reservoir 16 to simplify loading and maintenance. That Housing 14 can also contain the tray or just the sheet feeder. Alternatively, the Mechanism 12 can be built into the copier 10 or as a unit by itself next to the copier to be ordered.

The mechanism 12 is capable of pulling individual sheets from one ruler to the other of the two stacks feed, the characteristics of which are different can. In the description below, the difference is in length; H. a stack has one Sheet length of about 28 cm and the other a sheet length of about 35.6 cm. Other different properties the stack of sheets can, for example, be such that one stack is formed from paper and the other from offset template sheets or storage cards or colored paper sheets.

The storage container 16 is slidably mounted on rails, which are not shown, and carries one Pull-out and feed mechanism 20. The mechanism 12 includes two stack holders 22 and 24 (FIG. 2), the two resilient and rotatably mounted arms 26 and 28 with rollers 30 and 32 contains. Instead of roles plates can also be used. Fine spring 42 presses the arms 26 and 28 against each other, so that the Rollers 30 and 32 are pressed against the outer surfaces 34 and 38 of the two "stacks of paper 38 and 40" that rest on the bottom plate of the storage container 16.

The stacks are pressed by rollers 30 and 32 against a pair of guide rollers 44 and 46 which coincide with the faces of the inner sheets of the stacks are in contact. The guide rollers 44 and 46 help that the Sheets of the pile held in a vertical position and are slightly offset from one another to avoid mutual contact. To this Way, the stacks are kept close together and separated, so that the first sheets that peeled off face each other. The leadership roles are shaft η with a number of pulleys on it, but can also be continuous rotating pulleys be.

The ends of stacks 38 and 40 that are adjacent to mechanism 20 contact side walls 50 and 52 so that newly inserted stacks can be properly aligned. The side walls 50 and 52 have aligned parts and are bent outwardly away from one another in order to be in the mute of the assembly to act as outer paper guides within the withdrawal and feed mechanism 2Ö. Between these Outside the paper guides 50 and 52 and within the stacks, Veilbleche 54 and 55 are arranged, which as inner paper guides are used. These guides ensure that the leaves that run from one vein other stacks have been withdrawn, correct one Feed roller 56 are fed, which cooperate with separation rollers 60 and 61. The inner paper guides 54 and 55 are on a Tragorrn 68 (Fig. 4) attached. Also arranged on this support arm 68 is a take-off roller 58, which closes between the stacks come and is driven by the feed roller 56 by a belt 62, which is between the inner guides 54 and 55 extends. A reversible electric motor 116 (Fig. 4) drives a Belt 117 has a vertical drive shaft 80 on which the Feed roller 56 is firmly attached. The retaining rollers 60 and 61 are driven by gears, and although via the gears 82. 84.86 from the shaft 80, so that the retaining rollers 60 and 61 in the same direction rotate like the feed roller 56, but at about a third to a quarter of its speed. It is thereby achieved that the retaining rollers rotate counter to the feed roller 56 and thus too much try to push the removed sheets back to the respective stack.

The support arm 68 (FIG. 4) is firmly connected to the upper end of a support bracket 70 which in turn is connected to attached to a frame of the mechanism 20 and a portion of the shaft 80 is given. At the bottom of the tube A double arm 72 is attached to 70. A spring 7C is with one end of the arm 72 and a fixed suspension connected in such a way that the spring 78 acts eccentrically in such a way that the arm 72 and the associated When deflected beyond a central position, which is given by the shaft 80, the arrangement in two stabiL-n end positions is retained. This causes pick roller 58 to be against the innermost sheet of one of the stacks firmly pressed on by the action of the spring 78 (FIG. 7).

The desired stack from which a sheet is to be withdrawn can be selected by actuating a selection switch 64. which is attached to the housing or to the copier 10. to be selected. The switch 64 is connected by a Bowden cable arrangement 76 to the ends of the double arm 72, as shown in FIG. 5 and 6 demonstrate. Depression of one of the buttons on switch 64 (FIG. 5) rotates arm 72 until spring 78 comes over the bearing point of this arm and then presses the pull-off roller 58 against the stack 38. That Depressing the other button (Tig. 6) of the switch 64 rotates the arm 72 in the other direction and the peeling roller 58 comes into contact with the stack 40.

Actuation of switch 64 also causes an electric motor reverse switch to be toggled 132 (Fig. 9), by means of which the direction of rotation of the motor 116 is reversed. That way will ensures that the feed roller 56 and the peel roller 58 are in the appropriate position for each stack be rotated in the direction to pull a sheet off the stack with the roller 58 attached If the position of the pull-off roller 58 is changed, the direction of rotation is reversed. At the same time, the Retention rollers 60 and 61 rotated in the appropriate direction to match the stack of sheets subtracted from. The frictional contact between the feed roller 56 and the retainer rollers 6Ö and 61 is light, but sufficient enough to properly affect an intervening sheet.

The take-off roller 58 can be lifted intermittently from the stack with which it is in Contact is available. For this purpose, a pair of relays 66 and 67 (Fig. 5) is provided, their armature

via connecting rods 74 to arm 72 are connected. The energization of the relay 67 pulls the arm 72 away from the position shown in FIG. 6 and 7 position shown in the position shown in Figure 8, in which the take-off roller 58 is no longer with the sheets of the stack 40 is in contact. The movement of the arm 72 caused by the relays 66 and 67 is not so strong that the spring 78 moves beyond the central position so that when the relay is de-energized, the spring 78 engages the arm 72 and the peeling roller 58 connected therewith to the previous position, as shown in Figures 6 and 7, in which the roller 58 is the innermost Sheet of the stack 40 touches. The operation of relay 66 is similar for excitation and de-excitation.

Between the motor 116 and the reversing switch 132 (Fig. 9) three motor control switches 122, 124 and 128 are arranged in a parallel arrangement, the are able to switch the supply circuit of the motor independently of each other. Of the Switch 122 is controlled by a timing cam 120 from copier 10 and starts closing the paper feeder. The actuating arm of the sounder 124 lies in the paper path from the stack 40 between the Paper guides 55 and 52 (Fig. 8) and is closed by the presence of a sheet of paper between them, to keep the motor 116 running until the blade releases the actuator arm. The operating arm of switch 128 is in the paper path from stack 38 between paper guides 54 and 50 and is through the presence of a sheet in between to keep the motor running until the sheet is closed Actuating arm releases.

The relays 66 and 77 have control switches 130 and 126 in their feeder circuits (Fig. 9). The operating arms of switches 126 and 130 are in the same Paper paths located like the actuator arms of switches 124 and 128, but on a slightly earlier one Job. Closing the relay control switches operates the associated relays while a sheet of paper is the Actuating arm happened.

In the copier 10 is a paper transport mechanism Mus 48 with a belt 100 (Figs. 2 and 3) arranged by the withdrawal and advancement mechanism 20 the sheet is fed. The belt 100 advances the sheet to an exit lock 102, which acts as a timing and / or alignment station. The transport belt 100 is endless and around a vertical deflection roller% and a horizontal drive roller 104 guided by a drive motor 101 is driven by a gear drive. In this way, the belt 100 is twisted at right angles the direction of rotation depends on the soft side of the sheets in stacks 38 and 40 upward or to come to rest at the bottom of the outlet barrier 102. The belt 100 is adjacent and in light contact with a fixed guide 106 made of a relatively low friction material such as made of smooth metal or plastic or made of metal with a polytetrafluoroethylene coating or other material with a low coefficient of friction. This guide 106 is twisted in such a way that it is a vertical edge next to roller 96 and a horizontal edge next to exit lock 102 and thus runs parallel to the belt 100 In the area of the horizontal end, the guide 106 is perforated, thus two conveyor rollers, which are arranged on a shaft driven by a motor 101, through they can reach through. On a pair of rotatably mounted support arms of the curfew lock 102 a shaft 110 is arranged, which carries pressure rollers opposite the conveyor rollers 108. By shifting of the arms carrying the outlet barrier 102 are the conveying and pressure rollers 108 and 110 together. The curfew lock 102 is rotated and can be moved in and out of the way of the paper and can be actuated by known and suitable mechanisms in the correct time slot so that there is

ίο Adjoining sheets in the sheet transport of the copier 110 can be transported at the precise time required. Simultaneously with the swiveling out of the Outlet barrier 102 from the paper path, the rollers 108 and 110 come together, so that the adjacent Sheet is transported into the copier 10. In addition to the pulley% of the conveyor belt 100 is a second vertical roller 98 is attached, which is supplied by the pulling and feeding mechanism 20 The sheet is pinched and inserted between the belt 100 and the guide 106.

The method of operation of the device will be explained in more detail below.

To load new paper, the supply container is pulled outwards to the upper part of the Release stack holders 22 and 24. The rollers 30 and 32 are each supported by their associated guide rollers 44 and 46 pushed away to clear a gap between them. A stack of cut sheets is coming with the comes are inserted down into each gap and the rollers 30 and 32 released again to the respective Press the stack against the guide rollers 44 and 46. For example, the two stacks are different by their different lengths. When they are inserted, the stacks are in contact with the guide walls 50 and 52 inserted. The take-off roller 58 is held in such a position that they are not with the stack of paper to be inserted comes into conflict with a situation as shown, for example, in FIG. Then the storage container 16 is pushed back into the housing 14.

If the copier 10 is to work, the operator first selects the stack. from the leaves are to be peeled off for the production of copies, to be precise by actuating the selection switch 64.

This switch 64 pulls the arm 72 and the withdrawing and advancing mechanism 20 through the Bowden cable 76 across the center, which then, by the spring 78, brings the take-off roller 58 into contact with the selected Pile is held. The take-off roller 58 remains in this general position during all of the following Operations until the operator changes the position of the selection switch 64. Thereafter, the copier is turned on is set in motion and the control cam 120 begins to rotate.

At the same time, the motor 101 is turned on and so that the transport belt 100 is driven during the entire operation of the copier is constantly in motion until it is switched off again. Just before a sheet of curfew 102 is required, the control cam 120 closes the switch 122 and thus activates the motor 116 for Drive for the feed roller 56, the belt 62 and the take-off roller 58 and via the gears 82,86 and 87 Hold-back rollers 60 and 61. The pick roller 58 rotates in such a direction as to pick up the first sheet of the Stack with which it is in contact to be withdrawn towards the feed roller 56. The first sheet is between the corresponding guides 50 and 54 or 52 and 58

guided and then advanced further by the feed roller 56. The retaining rollers 60 and 61 urge every sheet that has been pulled off too much is returned to the respective stack. The frictional contact between the Restraint rollers and the feed roller 56 is light. A a single sheet of paper can be pulled out between these two rollers with a minimum of force, however, the force between the rollers is large enough to cause the feed roller 56 to advance the sheet as long as only part of the sheet is in contact with it. When the leading edge of the sheet is the Reaching the actuating arm of the switch 126 or 130, these switches are closed and the removal process is ended by actuating the relays 66 and 67. The relays pull the arm 72 and the take-off roller 58 from their connecting rods 74 respective stack away, but not beyond the middle position. Then the feed roller 56 pulls the first one She continues to peel off the stack and advances it to rollers 96 and 98.

Thereafter, the leading edge of the sheet comes to the operating arms of the switch 124 or 128, whereby the motor 116 remains active. The control cam 120 then releases the switch 122, the motor 116 however, remains active through switch 124 or 128.

The endless belt 100 is operated at a speed higher than the peripheral speed the feed roller 56 is once the paper between the roller 98 and the pulley 96 with the If the belt 100 is guided on it, the frictional force is not large enough to move the sheet between the Pull out feed roller 56 and the associated retaining roller 60 or 61. If the trailing edge of a If the sheet is no longer in contact with the feed roller 56, part of the sheet is already securely between the Belt 100 and roller 98 and guide 106 introduced. The hand will then have the higher one Speed of the belt 100 transported to the exit lock 102.

When the trailing edge of the sheet passes the actuator arm of switch 126 or 130, it opens associated switch and interrupts the circuit for the relay 66 or 67. The eccentrically mounted spring 78 thus pulls the arm 52 and the take-off roller 58 back into contact with the respective stack. That The next sheet is already deducted by a small amount until the trailing edge of the first sheet denies Actuating arm of switch 124 or 128 has passed. This is done before the next sheet hits the feed roller 56 has reached The switch 124 and 128 opens the circuit for the motor 116, so that the rotation of the The feed roller 56, the retainer rollers 60 and 61 and the take-off roller 58 has ended.

The sheet clamped between the belt 100 and the guide 106 is moved in the direction of belt movement transported until the leading edge hits a pair of fingers of the curfew block 102. As soon as the Copier 10 reaches the TeU of an operation cycle on the paper at the exact timing If processing is to be used for other copier functions, the arms that support the shaft 110 are drained and the outlet lock 102 raised to the Share paper this way. The sheet of paper is between the feed rollers 108 and the pinch rollers 110 pinched and quickly into the copier

10

15th

20th

25th

30th

35

40

50

55 transported into it . Thereafter, the pinch rollers 110 are raised again when the paper sheet has passed, and the catch 102 with your fingers falls back into the paper path.

If another sheet of paper is required for a new copy cycle, the control cam 120 closes press switch 122 again and the feed sequence is repeated. This happens every time that Copier 10 requires the feeding of a new sheet. The leaves come from the one before selected batch until the operator changes the position of the selection switch 64.

Because the timing of the paper in the copier 10 itself is precisely controlled by opening the exit lock 102, needs the timing of the operation of the take-off roller 58 not to be set so precisely. It just has to Be sure that the pulling and feeding of a sheet to the curfew 102 before opening the Lock itself takes place.

To facilitate passage of a sheet between belt 100 and guide 106, it can be advantageous to let in the surface of the guide 106 small rotating balls to reduce the friction between the blade and the guide 106 while maintaining sufficient frictional force, to keep the sheet moving between the belt and guide 106.

Furthermore, a sensor can be provided for sensing the stacks in order to indicate when there is little or there is no more paper, and thus possibly to switch off the machine. The relative position the actuator arms of the motor control circuits 124 and 128 and the relay control circuits 126 and 130 not to be described exactly. However, the arms of the motor control switches must be arranged in such a way that that they close the switches before switch 122 opens and so on. that they open the switches before a second sheet has reached the feed roller 56. The operating arms of the relay control switches must be arranged so that they close the switches after the sheet is withdrawn from the feed roller 56 has reached and is advanced through this.

The mounts for the stacks are stationary and only the relatively small trigger mechanism is available for selection of a stack from which the removal is to take place, displaceable. Due to the fixed arrangement of the two Stack opposite the withdrawal mechanism arranged in between results for both stacks the same timing and a common feed device and a common feed path. In addition, the edge-wise arrangement of the sheets allows no processing differences occur between the stacks, which would occur if in a stack from above and sheets would have to be peeled off from the bottom of the other stack.

Advantageously, the feed device for Cut sheets can be used not only in conjunction with a copier, but also with all Devices that require the feeding of two stacks of sheets with different properties for example an offset press or a duplicating machine.

For this purpose 4 sheets of drawings

Claims (8)

Patent claims: 1. Device for feeding individual sheets of paper to a processing device, in particular a copier, with two stacks of sheets separated in a storage container each on edge on one side edge are stored upright and in between a common, in a movable suspension Abziehroile mounted, reversibly drivable in their direction of rotation according to the selected stack is arranged, wherein the suspension is selectively movable to the respective first sheet of the pulling off one or the other stack, characterized in that the suspension (68, 70, 72) mounted pivotably, by an eccentrically mounted spring (78) in its selected Position stable and with the pull-off roller (58) through relays (66, 74 or 67, 74) briefly from selected stack (38,40) can be lifted without the spring (68) is deflected over the middle position and thereby ν overturns the other stable position. 2 device according to claim 1, characterized in that that the stacks (38, 40) by means of a spring (42) tensioned pressure devices (26, 30 or 28, 32), which act against the rear sides (34, 36) of the stacks (38, 40), can be pressed against one another 3. Device according to claim 2, characterized in that that the stack (38, 40) of the pressing device (26, 30 or 28, 32) against support means (44,46) pressed and held separately. 4 Device according to claim 3, characterized in that d ^ P the support means (44, 46) have rollers. 5. Device according to one of the preceding claims, characterized in that a single sheet advance mechanism (56) is provided for advancing the single sheet withdrawn from one of the stacks (28, 40). 6. Apparatus according to claim 5, characterized in that that a sheet feed mechanism is arranged in the middle of the stacks (38, 40) Feed roller (56) is provided. corresponding to the selected stack (38, 40) in their direction of rotation is reversible. 7. Apparatus according to claim 6, characterized in that that a retaining roller (60, 61) is arranged on each side of the feed roller (56). Which against this (56) circulate at a slower speed in order to avoid too many withdrawn sheets for to push back the respective stack (38,40). 8. Device according to one of the preceding claims, characterized in that it is used for isolation is used by sheets of different properties, especially with regard to their size.