DE1966601A1 - STEP CONTROL UNIT FOR GENERATING AN INTERMITTING ROTATION OF A GEAR - Google Patents

Description

Dft. MKRQ DIFL-FNO. STAFF FATKNTAN W AL ΓΚ

P 19 21 673.0-51 Tr.A. 16. OCT. 1972

Act of law enforcement ι 22 950 KABUSHIKI KAISHA RICOH, TOKYO / JAPAN

Stepping mechanism for generating an intermittent rotation of a gear

The invention relates to a stepping mechanism for generating an intermittent rotation of a gear.

Such an indexing mechanism is suitable for a device for recording information, in particular for a device for the continuous electrophotographic recording of information on a tape-shaped electrophotographic recording material. Pur such a device it is known, at least intermittently in such a way to advance the recording material in the recording station, that it is stationary during the imagewise exposure relative to a recording end distinguished cathode ray tube in the recording station. For the intermittent advance of the recording material, a stepping mechanism is to be used, as is the case

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used by moving picture projectors (FR-PS 1 373 673).

In a known motion picture projector, the film is from the Gate roll pulled off continuously and through the Pilmkanal one gripper is switched intermittently.

The invention provides a step-by-step mechanism as described in the introduction mentioned type created, which is characterized by particular simplicity in construction and a rotation of the gear to be driven by as precise an amount as possible.

According to the invention, it is proposed to drive the stepping mechanism to use a continuously driven drive shaft on which one meshes with the gear Toothed disk is arranged, the toothing of which is essentially

_Ä surfaces in the circumferential direction dsr toothed disc proceeds, which corresponds

■ Neither the toothed disk is firmly connected to the drive shaft and the toothing does not have a suitable gradient for driving the gearwheel over a part of the circumferential angle of the toothed disk and a gradient over an adjoining circumferential part, or the toothing r. Over the entire circumferential angle of the toothed disk a pitch suitable for driving the gearwheel a.ufv / sist and over eit ^ n part of the circumferential angle opposite: 1er drive shaft, avoiding a movement driving the gearwheel bsv; e; \ sr and over one

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adjoining peripheral part for driving the gear can be moved around a T7eg compensating for the evasive movement.

In one embodiment, the toothing is the toothed disk an interrupted tooth rib extending essentially in the circumferential direction of the toothed disk, which on a part their length with constant and on the rest of their length with changing distance to the axis of rotation of the toothed disc.

As a result, the gear is not driven as long as it is with that part of the tooth rib is in engagement, which has a constant distance from the axis of rotation of the toothed disc, where infecen the gear wheel is advanced by a certain amount as long as it changes with the one calibrated distance aur Axis of rotation of the toothed disk having part of the tooth rib is in engagement.

According to another proposal according to the invention, the toothed washer a worm which is axially slidably mounted on the drive shaft and has a stop cam, wherein a stop is provided on which the screw is axially opposite as it rotates over the stop cam the drive shaft moved 'vird.

As long as the screw rotates with its stop

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cam rests axially on the stop, the gear wheel is taken along by the worm, which moves by one of the height of the Stop cam shifts the corresponding amount on the drive shaft axially. As soon as the screw continues to rotate the stop cam is released from the stop, the worm is driven by the gear on the drive shaft axially pushed back by the amount by which they were during the abutment of the stop cam on the stop was advanced. Ba is the resistance between the drive shaft and the If the worm is small in relation to the resistance which the gear wheel opposes to a rotary movement, the gear wheel stands quiet when pushing back the worm.

The invention is explained in more detail with the aid of exemplary embodiments shown in the drawing. In the drawing shows"

Fig. 1 is a side view of the essential parts of an apparatus for continuously electrophotographic recording of information on a tape-shaped electrophotographic recording material, in which a stepping mechanism according to the invention is used will,

Pig. FIG. 2 is a perspective view of an inventive device used in the device according to FIG. 1 Stepping mechanism in a first embodiment,

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Pig. 3 is a side view of a stepping mechanism according to FIG Pig. 2 used whipped cream,

Pig. 4- a top view of another embodiment of a step switchgear according to the invention,

Pig. 5 shows a front view of the stepping mechanism according to Pig. 4 and

Pig. 6 is a perspective view of a worm with a stop cam to explain the mode of operation of the Step switchgear according to the Pig. 4 and 5.

According to FIG. 1, one sits loosely on a stationary shaft Supply roll for a tape-shaped recording material 1, which has a photosensitive layer on the surface of which a photoelectric conductive layer made of zinc oxide or the like is applied. The rolled up recording material 1 is perforated on one or both edges · The Recording material through a loading station 7, in which its downward-facing sensitive surface is electrostatically charged, and via a via the Shaft 9 continuously driven transport roller 8 with an integrally molded cream roll 10 thereon. The continuous rotation of the drive shaft 9 is

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the recording material 1 with the aid of the teeth of the toothed roller 10 sucked off the supply roll and conveyed downwards. In the further course of the guideway, the recording material 1 forms a supply loop 54A that runs through a pair of guide rollers 12, 14 and then a recording station with a cathode ray tube 16, on its front panel 16a it is done by means of a guide roller 17 is pressed. In the recording station it is the one to be recorded Information image is projected onto the recording material 1, with its charged light-sensitive Surface electrostatic latent images are formed · In order for the recording material 1 in the recording station during the normal exposure relative to Cathode ray tube stands still is behind the recording station a transport roller 20 provided with an integrally formed toothed ring 23 is arranged, which via its ^ rush 22 intermittently with the help of a switching circuit is driven. This makes the l'over the transport roller 20 guided recording material 1 in the area of the cathode ray tube intermittently advanced, with the supply loop 54A formed behind the transport roller 6 the required Length compensation to bridge the continuous Movement of the recording material in the area the transport roller? and the one driven by the step-wise Trcnsportrollc 20 evoked "step-by-step movement enables.

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The intermittently driven transport roller 20 is in a Sntwic'rlungsstation 19 arranged and immersed the exposed Recording material 1 in a developer solution, which consists of a carrier material with resin particles suspended therein There is printing ink and with a high electrical resistance, so that the electrostatic latent Image is converted into a visible image. The recording material 1 is removed from the developer station 19 by means of a guide roller 21 along a guide plate 29 through a drying stator with a fan 66, by means of which dry air on the developed recording material 1 is blown, which dries it. Behind At the drying station, the recording material is removed from the device by means of a pair of guide rollers 31, 33 led out, with the guide roller'33 via its chain drive is driven by the intermittently driven transport roller 20 step by step, so that it is in the area of The drying station does not lead to a loosening of the recording material.

The recording material 1 in the developer solution in The transport roller 20 immersed in a developer container 57 of the development station 19 becomes an intermittent gate feed of the Aufseiehnungsmaterials 1 by means of a stepping mechanism driven, which is shown in a first embodiment in FIG.

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According to Pig. 2, a drive shaft 34 is provided, which carries a gear 36 at one end, which with another Gear 35 meshes, which sits on the drive shaft 9 of the transport roller 8. At the other end is the drive shaft 34 provided with a toothed washer 39 which has a toothed rib 38 which is in a on the shaft 22 of the Transport roller 20 attached gear 37 can engage. The gear 37 meshes with the tooth rib 38 on the right part the toothed disk 391 if you have the gear wheel 37 and the toothed washers 39 viewed from the side of the transport roller 20.

The toothed rib 38 consists of a semicircular part 38a, the center of which coincides with the axis 0 of the toothed disk 39 coincides, and from a part 38c in which the part 38a is smoothly turned over at 38b and which gradually approaches the center 0 inwards. The beginning 38d of the hJJab circular Part 38a is removed from the opposite point 38e of part 38c by a distance which is a certain one Exposure time of the recording material 1 corresponds to »If the drive shaft 34 of a not shown Drive is continuously rotated in the direction indicated by the arrow a, the gear 37 remains stand stationary as long as it is with the semicircular part 38a of the tooth rib 38 meshes. While the gear 37 with the part 38c gradually approaching the center point 0 of the

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Tooth rib 38 meshes, however, it is in the direction of the Arrow b rotated by an angle corresponding to the stated distance between the beginning 38d and the point 38e. The recording material is thus intermittently advanced by the transport roller 20 and the ring gear 23, which rotate to the rhythm of the gear 37, which is intermittently driven in the manner described above. The recording material 1 is stopped during the time in which it is exposed, the exposure time that is, the time in which the movement of the recording material 1 is interrupted by a corresponding one Length of the part 38a of the tooth rib 38 can be set. The part 38c can also be designed in such a way that that it gradually moves away from the center 0 outwards.

The shaft 22 carries a chain sprocket 40. Two further chain sprockets 42 and 43 are fastened on a hollow shaft 41 which is pushed loosely over a shaft 24. About the Sprockets 40 and 42, a chain 44 is placed, so that the intermittent rotational movement of the gear 37 on the Sprocket 43 is transmitted via this sprocket 43 and another sprocket wheel 45, which sits on the shaft 32 of the guide roller 33, a chain 46 is placed, so dn, ° the rotational movement of the sprocket wheel 43 on the guide roller 33 is transmitted. By means of the leadership role

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Thus, the recording material 1 is gradually turned off in accordance with the stepwise rotation of the gear 37 the device led out.

As already described above, the recording material 1 in the device according to Pig. 1 from the transport roller and the ring gear 10 up to the pair of guide rollers 12, 14

if
continuously moved forward, 'the transport roller 8 and the ring gear 10 are both continuously via the gear 35 meshing with the gear 36, which sits on the drive shaft 34, from the drive, not shown, of the drive shaft 34 in the direction of the arrow c in Pig. 2 rotated. After the recording material 1 has passed between the two guide rollers 12, 14, it is now moved forward step by step by the transport roller 20 and the ring gear 23, which rotate intermittently. In a device according to Pig. 1 the successively electrically or optically transmitted information images are projected and applied successively, automatically and quickly onto the recording material 1, without the need for an expensive drive device. This significantly improves the efficiency of the recording process.

4 to 6 is another embodiment for

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a stepping mechanism shown »

A screw 103 is pushed onto a drive shaft 101 provided with a wedge 102, and the wedge 102 engages in multiplicity. The screw 103 Liann a formed on its Anschlagnoekstt 105 never-3 £, EDR ^i: c> t -Be, the _f cooperates with a stationary stop 104 and meshes with a ausrebi as a worm wheel;, Deten gear 106 »^ hen to the If the pitch of the worm 103 is P and the pitch of the angle passed through the solenoid cam 105 is oC, the height H of the stop cam is given by the relationship

H * P χ 360 - * . 360

If the drive shaft 101 is rotated in the direction of the arrow ( _{Fig. 4) by the angle Λ f} dasm becomes M ^ Sslmsoke 103 because of the relationships between 1ΐο * _? the stationary stop 104 "and the stop cam 105 are depressed by a distance which corresponds to the height H. The worm 103 causes the worm wheel 106 to rotate in the direction of the arrow (Pig. 5) by an angle which is equal to P χ« / 360 is · That is, after a rotation of the worm 103 through an angle ος, the gear 106 is rotated in the direction indicated by the arrow through an arc which is equal to

360 360 360

Then the worm 103 rotates through an angle of (360 - ⁰ O ⁰ ; however, because the resistance between the drive shaft and the worm 103 is extremely small, the worm

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ke the gear 106 does not rotate, but it will rotate a distance

P _Ύ 360 - * _ _H
^{P x} ^ 675 ^H

raised and thereby returns to its starting position. Thus, when the drive shaft 101 makes one revolution, the worm 103 rotates through an angle of, so dsß the gear 106 is rotated through an angle corresponding to the pitch 3P. However, if the snail rotates around the remaining angle 360 -o (, the gear 106 is not rotated. In this way, the gear 106 is caused to rotate intermittently.

It can be seen from the above explanations that in the stepping mechanism according to FIGS. 4 to 6, the worm 103 and the gear 106 cooperate so that the stop cam 105 formed on the worm, the intermittent Rotation of the gear 106 and thus the desired exact and reliable intermittent drive. The angle o < , over which the stop cam 105 extends, can according to the respective requirements can be freely selected so that different intermittent types of drive result.

- patent claims -

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Claims (3)

Claims i Stepping mechanism for generating an intermittent rotation of a gear, characterized by a continuously driven drive shaft (34, 101) on which a toothed disk (39ι 103) engaging the gear (37 »106) is arranged, the toothing of which runs essentially in the circumferential direction of the toothed disk , whereby either the toothed disk (39) is firmly connected to the drive shaft (34) and the toothing (38) does not have a suitable pitch for driving the toothed wheel (37) over a part (38a) of the circumferential angle of the toothed disk and over an adjoining peripheral part ( 38c) has a pitch, or the toothing has a pitch (P) suitable for driving the gearwheel (106) over the entire circumference of the toothed disk (103) and over part (angle 360 ° - OC) of the circumferential angle with respect to the drive shaft ( 101) _§ a movement driving the gearwheel (106) can be moved evasively and over an adjoining peripheral part (angle «) 309815/0962 - 14 - to drive the gear by one of the evasive movements compensating ^ 7eg (H) "is movable. 2. Stepping mechanism according to claim 1, characterized in that the toothing is in the '.vesslichen in The circumferential direction of the toothed disc (39) extending interrupted tooth rib (38) on a part (38a) of their length with constant and on the remaining part (38c) its length with changing distance to the axis of rotation (0) the toothed disc (59) runs. 3. Step switch according to claim 1, characterized in that that the toothed disk is a worm (103) which is attached to the drive shaft (101) so as to be axially displaceable and a stop cam (105), and that a stop (104) is provided on which the screw (103) is axially opposite the stop cam (105) when it rotates Drive shaft (101) is displaced. 309815/0952 BATH ORIGINAL