DE2337322A1 - DEVICE FOR LEAF FEEDING - Google Patents

Description

DR. BERG DIPLo-ING. STAPF

patcntanwXl. '«- *

• MUNICH »Ο. MAUKRiClRCriKltrrM. 4 ·

2 3rd JUU1973

Attorney file 24 146

Kabushiki Kaisha Ricoh Tokyo / Japan

Device for sheet feed

The invention relates to a device for the automatic replenishment of a sheet supply on a feeder table when a stack of sheets on it is exhausted by removing the sheets by means of a feeder installation.

Sheet feeding devices with discharge rollers or suckers for the automatic feeding of individual consecutive

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■ (Mil) «β« W »43 M33W TategRMMwi KROSTAPFPAnNT Mfm * ·« TaEXOISiSfOKIOd

■ yfcdw ilMbak MOndw 4M 100 Peidd, MQmfcw 15343 ORIGINAL INSPECTED

Sheets from a pile of sheets resting on a feeder table are used in practical designs for feeding printed sheets in duplicators, from Exposure sheets in copiers and of magnetic recording sheets in magnetic recording and transfer devices.

When using such feeder devices, after all sheets have been removed from a feeder table, a new supply of sheets must be applied to the latter. Up to now it has been customary to place a new supply of sheets on the feeder table by hand when the stack of sheets is exhausted. Any means for automatically applying a new sheet supply on the feeder table did not exist _o While an operator

after finding that the treason on the feeder isoh is exhausted, puts on a new supply, the device in question works idle. These and other disadvantages make a device for the automatic supply of sheets appear desirable.

The invention provides a sheet feeding device for the automatic replenishment of a sheet supply by means of a first The transport device arranged in front of the feeder when a stack of sheets resting on the feeder table is exhausted .

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OQ IO £. L.

According to the invention is one having a sheet feeder cooperating ITachubvorriclrirong characterized by one in extension of a feed table of the sheet feeder arranged transport device; by an arrangement for generating a sheet supply signal in the absence of sheets on the feeder table, and by one through the Sheet feed signal energizable device for actuating the transport device for the supply of a previously placed thereon fresh leaf supply to the feeder table. Are with the invention Device all sheets of a stack placed on the feeder table by the feeder devices from removed from this, a signal is generated to which the transport device responds to a waiting position to bring the new sheet supply located on the feeder table.

In the following, exemplary embodiments of the invention are described with reference to the drawing. Bari, shows

Pigο 1 is a side view of a sheet feeder cooperating Sfachschubvorrichtung. according to one embodiment of the invention,

Figo 2 is an oblique view of an embodiment of a Feeder tables,

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Mg «5 an oblique view of a ratchet wheel, a pawl and a pawl lifting ring in their positions relative to each other,

Mg. 4 a look at one to interact with the According to the invention replenishment device specific sheet feeder device for displaying various Details of the same,

Mg. 5 is a side view of a sheet supply and one of several blow pipes to show the exit of air currents from the pipe,

Mg, 6 shows a view of the feeding device shown in FIG according to the invention,

Fig. 7 is a sectional view of a leaf dressing plate and means for moving the alignment plate to its rest position and for attaching the alignment plate ,

Mg. 8 to 10 sectional views of other designs of the device for moving the alignment plate into the rest position,

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11 shows a side view of a suction part in its position opposite a sheet supply when the same is being replenished on the delivery table,

12 and 13 side views to show the catfish a gear lever which interrupts the pivoting movement of a drive lever for the suction part and

Pig, Fig. 14 is a side view of a sheet retractor according to the invention with a! transport device in the form of a flat table conveyor.

The invention is described below in terms of how to interact with a vacuum feed device specific embodiment a Haohschubvorrichtung explained.

In the side walls 1 and 2 of the device shown in Fig. 1 is a vertically extending in each case in the lower middle part Slot 3 is formed. The slot 3 in the wall 1 visible in FIG. 1 serves as a guide for two on one leg 4a of one Feeder table has 4 bearing rollers. 5 and 6. The corresponding Slot 3 in the non-visible wall 2 takes two non-visible mounted on the other leg 4b of the feeder table 4 Rolls 7 and 8 on. A toothed rack 9, with which a pinion 10 is attached, is attached to the front of the leg 4a

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is engaged. A ratchet wheel is seated on a part of a shaft 11 carrying the pinion 10 which is located outside the wall 1 12, on which a pawl 13 and a pawl are held in fixed contact by means of springs 15 and 16 attached to the shaft 11 at one end each.

The pawl 13 is articulated by means of a pin 17 on an arm of a lever 18, while the pawl 14 by means of a pin 19 is mounted on the side wall 1. A pin 20 inserted at the end of the other arm of the lever 18 is shown in FIG a fork 21a guided at the end of an arm of a lever 21. The lever 21 is attached to the side wall 1 by means of a pin 22 mounted and carries a roller 23 at the end of its other arm, which is in contact with a cam disk 24. At the arm of the lever 18 carrying the pawl 13 is formed with a stop 18a. On the side wall 1 is a locking lever hinged by means of a pin 25b and loaded by a spring 26 upwards. The top sheet is one on the feeder is 4 brought stack in one for the feed correct height, the locking lever 25 comes into contact with a stop part 25a on the attachment part 18a of the lever 18 and prevents it from pivoting.

A spring 27 attached at one end to a pin 27a inserted into the side wall 1 engages at the other end Lever 21 and loads the roller 23 in contact with the cam disk 24.

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If the lever 18 is held up by the locking lever 25, then the ratchet 12 held by the pawl 14, wherein the pawl 13 is also in contact with it, so that the pinion 10 also stops and the feeder table holds on to his position.

Together with the lever 21, a drive lever 28 is mounted on the pin 22. A spring 29 anchored at one end to the pin 27a engages the drive lever with the other end in order to load a shaft 30 rotatably mounted at the end of one arm of this lever into contact with a drive cam 31. A connecting rod 32 articulated at one end by means of a pin 33 at the end of the other arm of the drive lever 28 is articulated at the other end by means of a pin 35 at the end of one arm of a lever 34 and 2 mounted shaft 36, to which inward of the walls 1 and in each case a support arm 37 or _o 38 is fastened with its base (FIG. 4).

As can be seen in Mg. 4, is at the free ends of the support arms 37 and 38 a hollow shaft 39 is rotatably mounted. A guide arm is located at its end, which is initially located on the side wall 1 attached, at the free end of a guided in a slot 43 in the side wall 1 roller 41 by means of a pin 41a is rotatably mounted (Figo 1).

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Several pipe legs 44 ″ to 47 branch off from the hollow shaft 39 from, which each have a suction cup 48, 49, 50 or 51 and a support foot 52, 53, 54 "or 55 at their lower ends, which at the same time serves to prevent the feeding of two leaves at the same time.

As can be seen in Fig. 1, the drive cam 31 sits together with the cam 24 on a shaft 24a and is driven in the direction of the arrow «The rotation of the cam 31 causes an oscillating movement of the drive lever 28, which via the connecting rod 32 and the lever 34 onto the shaft with the support arms 37 and 38 is transferred thereby moved the hollow shaft 39 up and down together with the guide arm 40 along an arcuate line running around the shaft 36. The roller 41 mounted on the free end of the guide arm 40 moves in the guide plate 43 and holds the control arm 40 aimed at this.

The pipe legs 44 Ms 47 move in the same way as the guide arm 40, so that the suction cups 48 to 51 from their initial position shown in Figo 1 along one of the the track corresponding to the roller 41 initially obliquely backwards downwards and vertically downwards and then again vertically upwards and obliquely forwards-upwards.

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At the end of the vertical downward movement, place the suction cups "to 51 on the top sheet S1 one on the Zuüringerfciscb. lying stack of sheets on. At this point, an air pump (not shown) is used over one at the other end of the Hollow shaft 39 connected suction line sucked air so that the suction cups 48 to 51 suck the sheet S1, whereupon they are As described above, move vertically upwards and then diagonally forwards-upwards to bring the sheet S1 in front of your feeder table 4 arranged pairs of conveyor rollers 57, 58 to be handed over, When the sheet S1 is transferred to the pair of conveyor rollers 57 » the suction of the air is stopped, so that the sheet S1 is released from the suction cups 48 to 51 and ready for further transport is gripped into the device by the conveyor rollers 57, 58. The movements of the guide arm 40, the hollow shaft 39 and the pipe legs 44 to 47 with the suction cups 48 to 51 are through one with one end on the side wall 1 and with the another spring 42 attached to the pin 41a supporting the roller 41.

As long as the sheet stack S on the feeder table 4 is sufficient The above-described feeding of the leaves by means of the suction cups is guaranteed. Decreased However, if the height of the stack of sheets increases, the downward stroke of the suction cups and thus the deflection angle of the increases Lever 34 · On the other arm of lever 34 is one at the end

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At a stop or aube 59 used so that it is a stop 25c on the middle rope of the locking lever 25 faces. When the deflection angle of the lever 34 increases, the stop screw is set 59 at the stop 25o and thus moves the locking lever 25 downwards.

During the downward movement of the locking lever 25, its stop 25a releases the lever 18 so that it can now swing back and forth. The pawl 13 is moved back and forth to the ratchet wheel 12 gradually in the direction of the in Pig. 1 _o The rotation of the ratchet wheel 12 is transmitted through the wool 11 to the pinion 10, so that this moves the rack 9 and the associated feeder table 4 upwards the leaves can continue. By lifting the stack S, the downward stroke of the suction cups 48 to 51 is reduced again, the deflection angle of the lever 34 becomes smaller, and the locking lever 25 moves upwards again until it comes into contact with the stop 18a of the lever 18 with its stop 25a and interrupts its movement.

In the manner described above, the sheets of the stack lying on the table 4 are removed one after the other

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Exhaustion of the stack S includes a switch SW arranged in the front cable of the feeder table 4 on its underside and thereby emits a signal to a solenoid SOL1 arranged in the lower central part of the side wall 1 (lig. 1). In a recess formed on the front band of the feeder table 4, an actuating member 61 of a further switch, not shown, which responds to the absence of sheets on the table is arranged (I ¹ Ig. 2). If the pressure exerted by the sheets S on the actuating member 61 decreases, the relevant switch closes and generates a signal for the supply of a new supply of sheets to the table 4.

On the shaft 11 carrying the ratchet wheel 12 there is a ratchet release ring 62 rotatably mounted with projections 62a, 62b for lifting the pawls 13 and 14 from the ratchet wheel 12. He is by one at one end with a pin 63a inserted into its side surface and at the other end with the pivot pin 19 of the pawl 14 connected spring 63 is loaded clockwise. As long as there are leaves S on the feeder table are, ist.der Aushebing 62 with a nose 62c in contact with the pin 19> wherein the projections 62a and 62b occupy positions in which they of the pawl 13 and the pawl 14 released. The lifting ring 62 transmits movement to the solenoid via a further projection 62d S0L1 connected. As soon as this by closing the switch Sv'i attracts, the lifting ring 62 is against the load

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is by the spring 63 is rotated in Greg-clockwise on the shaft 11, the "the pawl 13 or _e stand two Yorsprünge 62a and 62b, the pawl 14 from the teeth of the ratchet wheel 12 as shown in Mg. 3 is shown with reference to the pawl 14. Thus, so give the two pawls 13 and 14 the ratchet 12 free.

By releasing the ratchet wheel when lifting the pawls 13 and 14 of its teeth, the pinion 10 is now freely rotatable, so that the rack 9 with the feeder table 4 is below Gravity can move downwards ..

On the right-hand side in FIG. 1, the side wall 1 has a part with a lower height, on its front or left-hand area an alignment plate 64 for the blades and a support arm 65 for a blow pipe are arranged. How in Pig »4 7 and 7, the alignment plate 64 is movable at its lower part by means of an arrangement of screws 66 and nuts 67 attached to the side wall 1. One inserted between the lower part of the alignment plate 64 and the side wall 1 Leaf spring 68 loads the upper part of the plate 64 inwards, so that the latter becomes the stack of sheets lying on the table 4 S is inclined and it is firmly in contact with the side wall 2 to keep the side edges of the sheets aligned (Fig. 4). The right-hand or rear edge of the

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Alignment plate 64 is angled slightly outwards in order to feed a new sheet of paper onto the feeder table not to hinder.

The support arm 65 is fastened to the side wall 1 at its base by means of three screws. A hollow shaft 70 is with a The end rotatably mounted in the upper part of the support arm 65 and the other end in the side wall 2. One outside the side wall 2 at the end of the hollow shaft 70 seated gear 71 is in engagement with a gear 72 one on the side wall 2 mounted rotary solenoid S0L2 (Jig · 1).

As you can see in Pig »4, there are several on the hollow shaft Pressure and blow pipe legs 73 to 75 attached. As long as the rotary solenoid S012 is not excited or as long as it is on Sheet supply S is located on the feeder table 4, the pipe legs 73 to 75 are in firm contact with the rear edges of the sheets S held to align them. The pipe legs have, as in! Pig. 5 based on the pipe leg 73 shown, in each case a number of blow openings 73a and are from a fan (not shown) via a supply line connected initially to the support arm 65 on the hollow shaft 70 air-fed This is how the air is blown onto the rear edges of the leaves to prevent them from sticking together. In this way, several sheets can be discharged at the same time additionally prevent it using the suction cups.

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A ring seated on the hollow shaft 70 near the support arm 65 carries a lifting finger 77 for pivoting the alignment plate outward 64. Opposite the finger 77, the alignment plate 64 has a deflector 78 at its upper corner (FIG. 7).

When the sheet supply S on the feeder table 4 is exhausted, the switch operated by means of the actuating member 61 is turned off closed and thereby emits a signal for the supply of a new sheet supply to the table 4. The through the Signal energized rotary solenoid S0L2 rotates the hollow shaft 70 in the counterclockwise direction by about 50 °, around the pipe legs 73 to 74 in To bring a position outside of the path of movement of the stack of sheets So, at the same time, the lifting finger 77 moves in. the position 77a shown in dashed lines in FIG. 7 and runs up against a flank 78a of the deflector 78 in order to thereby the Alignment plate 64 to pivot into the position shown in dashed lines 64A, in which they the transport of the sheet stack So on does not interfere with the feeder table 4.

Figure 8 shows another arrangement for moving the alignment plate to the neutral position. In this case there is a pen inserted into a side surface of the ring 76, and the deflector 78 fixedly connected to the plate 64 has a pin 77 facing Ramp 78a. In the embodiment shown in FIG an arrangement for moving the alignment plate 64 in FIG

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their neutral position is an inclined run-on surface 79a having deflector arm 79 so attached to the hollow shaft 70, that he can move the plate 64 into the neutral position "by engaging it directly. Mg. 10 shows another Arrangement for moving the alignment plate 64 to its neutral position, with an arrangement corresponding to that shown in Fig. 8 Deflector 78, on which a corresponding to that shown in lig, 4 Lifting finger 77 runs up. According to the invention, any arrangement for moving the alignment plate can be used in the neutral position.

After the pawl 13 and the pawl 14 have been lifted out by means of the lifting ring 62 out of engagement with the teeth

of the ratchet wheel 12 moves the feeder table, on which there are now no more sheets, under IHihrung the rollers 5 and 6 in the slot 3 and with the engagement of the pinion 10 on the rack 9 down until the roller 5 is seated at the lower end of the slot 3 _c Table 4 is now in Pig. 6 lower end position shown. ·

Below the lower end position of the table 4 is an endless toothed belt 80 or 81 on both sides thereof arranged ο The toothed belts 80 and 81 are each around a pair Gears 82, 83 and 84, 85 are looped. The length of the top Trums of the toothed belt is about two and a half times the

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Length of the feeder table 4. On the rear end of the upper run of the belt can be placed _e at any time a Sfachschub-sheet stacking The gears 82 and 84- and the gears 83 and 85 are each seated rotatably on a wall in the side 1 and 2 The shaft 87 is displaceably arranged in slots 88 formed in the side walls 1 and 2, only one of which is visible in FIG. 1, and can be moved in the longitudinal direction of the walls. A screw 90 supported on an end wall 89 of the device housing is used to align the position of the shaft 87 and thus to tighten or loosen the toothed belts 80 and 81.

Between the wheels 83 and 85 is the shaft 87 on the middle part a support roller 91 is arranged for the stack of sheets. Below the front part of the stack of sheets So is another support roller 92 in alignment with the other support roller 91 between the belt 80 and 81 mounted on a shaft 93 seated on the side walls 1 and 2.

A gear 94 seated on the shaft 86 is in mesh with a gear 97 on the shaft 96 of a motor

First of the slot 3 is a switch 99 which can be actuated in the lower end position of the feeder table 4 and has a switch 99 in the

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Actuating member 98 protruding from the slot 3 is arranged. During the downward movement of the feeder table 4, the roller 5 rests on the actuating member 98 in order to close the switch 99 and thus to set the motor 95 i * ¹ gear. The motor 95 drives the gears 82 and 84 via the gears 97 and 94, so that the toothed belts 80 and 81 move in the direction of the arrow a. 6 set in motion. The sheets So placed on the rear end of the belts 80 and 81 are transported to the feeder table 4 as a new supply.

On the side walls 1 and 2 are support strips 100, of which I ¹ Xg. 1 only one is visible, mounted so that they respectively extend to the respective toothed belts 80 _o 81 along and together So carry the stack of sheets with this. On both sides of the front part of the feeder table 4, support pads 101, 102 are attached with rear edges angled downwards. The width of the feed table 4 is smaller than that of the sheets, in order to facilitate the transfer of the sheets from the toothed belts 80 and 81 to the table 4. For this reason, however, as shown in dashed lines in Pig2, the sheets tend to hang down on both sides, which can have a disruptive effect on the transfer of a new supply of sheets to the feeder table 4. This difficulty is eliminated by the support pads 101 and 102.

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How to do in Pig. 1, 12 and 13, the solenoid has S0L1 an armature 103 with a pin 104 seated thereon, on which a lever arm 105 engages with an engaging part 105a. Of the Lever arm 105 is arranged pivotably together with a lever arm 107 on a pin 106 fastened to the side wall 1. A spring 108 seated on the pin 106 engages with one end on the lever arm 105 and with the other end on the lever arm 107 The lever arm 107 has a stop 107a with which it is supported on a counter-stop 105b of the lever arm 105. The lever arm 107 has a catch hook 107b in a position corresponding to the pivot pin 33 on the drive lever 28, which, however, is outside the path of movement of the pin 33 as long as the solenoid SOU is not energized.

When the solenoid coil SOLI is excited, they move over the Spring 108 interconnected lever arms 105 and 107 together around the pin 106, the catch hook 107b of the lever arm 107 getting into the path of movement of the pin 33 (FIG. 12). The pin 33 moves up and down together with the drive lever 28 driven by the cam disk 31 and becomes as soon as it moves below the catch hook 107b, it is gripped by the latter (FIG. 13). This will make the vibrating Movement of the drive lever 28 and thus the drive of the lever 341 of the support arms 37, 38 and the suction cups 48 to 51 interrupted, The suction cups can now not go down move and thereby interfere with the transfer of the stack of sheets of paper to table 4.

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By transferring a new stack of sheets S to table 4 the two switches are opened, so that the magnets SOU and SO12 fall off and the individual parts of the feeder device return to their operating position to resume feeding the leaves.

As can be seen from the above description, the invention enables the automatic replenishment of a sheet stack that has been brought onto the transport device at any time as a new sheet supply onto a feed table when the sheet supply is exhausted the feeder table is automatically lowered _e However, the invention can also be applied to a device in which the lowering of the feeder table is done by hand.

Instead of the above-described transport device with endless toothed belts, a transport device according to Pig. 14 can be used with a level conveyor table.

In the case of the transport device shown in FIG. 14, there are two elongated links 110 are articulated with their upper ends on both sides at the front end of a conveyor table 109. A couple too the members 110 parallel, shorter members 111 is with the upper ends on both sides at the rear end of the conveyor table

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hinged. At the lower ends are the links 110 and 111 articulated to a "movable slide 112. The Pivoting movement of the longer links 110 is achieved by two stop pins inserted on both sides of the slide 112 113 and 114 limited.

The carriage 112 has one in each on both longitudinal sides Slit 115 running in the longitudinal direction for receiving pegs that are seated on (not shown) stationary parts 116 and 117 »which guide the carriage 112 movably and limit its movement. A rack 118 attached to the underside of carriage 112 is engaged with a pinion 119.

Below the front and rear end pieces of the carriage 112 stop pins 120 and 121 are attached to stationary parts of the device, on which the members 110 come into contact with their downwardly protruding parts in order to be pivoted in one direction or the other. The above-described arrangement of the links and stops causes the flat conveyor table 109 in the front end position of the carriage 112 in a position below the level of the feeder table 4 and in the rear end position of the carriage in a position above the level of the surface of the tissue 4 Position. the

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The rear end position of the conveyor 109 and the slide is shown in ^{dashed lines in J 1} Ig ₄ , 14 and with 109A or «. 112A.

The pinion 119 is in two of a motor (not shown) Directions drivable «During the forward movement of the carriage 112, the conveyor table 109 is in the upper and in the Backward movement in the lower position, so that the transfer of a sheet supply to the feeder table is trouble-free accomplishes.

According to the invention, transport devices can be different Type are used, the arrangement of the transport device can be chosen differently, provided that they are only close to Feeder table takes place «The feeder isoh 4 does not need how described above to be movable upwards and downwards, but can be permanently installed as an extension of the transport device be. In this case, the sheet feeding device according to the invention has all the structure shown in Fig. 6, and the motor 95 is operated directly on the absence of sheets Switch operated on the table instead of the suction cups can be used for the feeding of individual successive Sheets used an arrangement of rollers »To move upwards and lowering the feeder can replace those described other known facilities may also be present.

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Claims (3)

Claims: 2 ο OI 322 ί 1.j sheet lifting device for a sheet feeder arrangement having a feeder table for removing individual, successive sheets from a stack of sheets lying on the feeder table, characterized by a sheet stack feeder transport device (80 to 97 or 109 to 121) arranged in alignment with the feeder table (4), by means of a device (SW, 60, 61) responding to the absence of sheets (S) on the feeder table for generating a sheet stack feed signal and by a drive (95), which can be triggered by means of the sheet stack feed signal, for the transport device for transferring a new supply of sheets previously brought onto the transport device (So) on the delivery table. 2. Apparatus according to claim 1, characterized in that the feeder table (4) in each case when discharging individual Sheets (S) upwards by means of the feeder arrangement (28 to 55) is movable so that the top sheet of a stack of sheets lying on the feeder table is always in the at the same height and that the feeder table is at Depletion of the applied sheet supply can be moved downward into a sheet supply position. - 23 - 409807/0370 3. Apparatus according to claim 1 or 2, characterized by a device (99, 98) responsive to the movement of the feed table (4) down into the sheet supply position for actuating the drive (95) of the transport device (80 to 97) after the downward movement of the feeder table and after generating the sheet supply signal. 409807/0370