US3659938A

US3659938A - Information recording device

Info

Publication number: US3659938A
Application number: US819587A
Authority: US
Inventors: Sakae Fujimoto
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 1968-04-30
Filing date: 1969-04-28
Publication date: 1972-05-02
Anticipated expiration: 1989-05-02
Also published as: DE1966601A1; DE1921673C3; DE1921673B2; NL6906601A; DE1921673A1

Abstract

An electrostatic-photographic information recording device wherein a recording sheet is fed through an electrostatically charging section, an exposure section (photographing and recording section), a developing section and a drying section. The pressure rollers disposed in said sections and feed rollers are displaced by operation of one lever from the exterior of the device to the positions so as to open the path of feed of said recording sheet for loading the same in the device.

Description

United States Patent Fujimoto [4 1 May 2, 1972 [54] INFORMATION RECORDING DEVICE Rflmllm [72] Inventor: Sakae Fujimoto, Tokyo, Japan UNITED STATES PATENTS [73] Assignee: Kabushiki Kaisha Ricoh, Tokyo, Japan 2'529'495 1/1950 Harlow "95/99 3,340,618 9/1967 Bentzmam. ....355/l0 X [22] Filed: Apr. 28, 1969 3,473,451 10/1969 Greenly 355/40 X 3,517,994 6/1970 Leedom. 355/13 X [211 APPI- 9587 3,517,997 6/1970 Ghiseili ..3ss/11 x Primary Examiner-John M. Horan [30] Foreign Application Priority Data Ammq Burgess y and Hicks Apr. 39, 1963 Jgpsn ..43/29280 Apr. 30, I968 Japan ..43/2928i [57] ABSTRACT 2 23 f i s: An eiectrostatic-photographic information recording device I968 J p wherein a recording sheet is fed through an electrostaticaily apan charging section, an exposure section (photographing and M 24 1968 Ja a 43/35105 p n recording section), a developing section and a drying section. The pressure rollers disposed in said sections and feed rollers U.S. are displaced operation of one lever from the exterior of [51] Int- Cl. the device to the positions so as to open the path of feed of [58] said recording sheet for loading the same in the device.

Field oiSeIrch ..355/3, l0, l1, l3

5 Sheets-Sheet 1 Patnted May 2, 1-912 FIG.

INVENTOR V dd ATTORNEY 5 Patented May 2, 1972 3 Sheets-Sheet 2 INVENTOR v fl/L ATTORNEYS SAKAE FUJIMOTO BY /%6VA Patented May 2, 1972 3 Sheets-Sheet 5 F IG.6

FIG.7

FIG.8

I INVENTOR SAKAE FuJmoTo g rgfi vs BACKGROUND OF THE INVENTION The present invention generally relates to an information recording device and more particularly to an information recording device utilizing electrostatic photography.

The conventional photographic device has been widely used for recording information, but since silver halides are used as the sensitive agent, the processing is tedious and both of the apparatus and the materials are very expensive.

One of the objects of the present invention is to eliminate the above described defects encountered in the conventional photographic device.

Another object of the present invention is to provide an information recording device utilizing the electrostatic process.

A further object of the present invention is to provide an information recording device incorporating therein an electrostatically charging section, an exposure section, a developing section and a drying section all of which are arranged to cooperate with one another for recording the information upon a recording sheet.

A still another object of the present invention is to provide an information recording device in which the recordingsheet is advanced intermittently in the exposure section.

A yet another object of the present invention is to provide an information recording device in which all of the pressure rollers disposed in the sections described above are simultaneously displaced to the positions away from the recording sheet upon operation of one lever thereby opening the path of feed of the recording sheet and facilitating the loading of the recording sheet into the device.

A further object of the present invention is to provide an information recording device in which the developing time can be arbitrarily adjustable.

SUMMARY OF THE INVENTION In brief, the present invention provides an information recording device of the type in which the images of information continuously transmitted electrically or optically can be successively projected and recorded upon a recording sheet at high speed by the electrostatic photographic process.

According to one aspect of the present invention, a cathode ray tube (CRT) is used as an information displaying device, and a recording sheet having a light sensitized coating layer such as special zinc oxide or the like formed upon one side surface thereof is made to pass upon the face plate of the cathode ray tube with the sensitized layer being in contact with the face plate. Prior to this, the recording sheet is electrostatically charged in the charging section and then exposed in the exposure section by the light image formed upon the face plate of the cathode ray tube, thereby forming an electrostatic latent image corresponding to the information light image. When the recording sheet is being exposed, it remains stationary. The exposed recording sheet is transported to the developing section where it is developed and then directed further toward the drying section where it is dried and from where it is discharged out of the device. In this case, to intermittently transport the recording sheet in order to hold stationary the recording sheet against the face plate of the cathode ray tube when it is being exposed, an intermittent drive mechanism which will be described in more detail hereinafter is utilized.

All of the pressure rollers for therecording sheet are simultaneously retracted from they path of feed of the recording sheet by operating only one lever so that the path of feed is opened or becomes accessible for loading the recording sheet into the device.

In order to adjust the developing time, one cam is used so as to incline a developing solution tray, thereby varying the level of the solution in the tray.

The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view illustrating only the essential parts of an information recording device of the present invention;

FIG. 2 is a perspective view illustrating one embodiment of an intermittent drive mechanism of the present invention;

FIG. 3 is an end view illustrating one example of a cam used in said mechanism;

FIG. 4 is a perspective view of one example of a cam used in a developing time adjustment mechanism;

FIG. 5 is a top view thereof;

FIG. 6 is a plan view of another embodiment of an intermittent drive mechanism of the present invention;

FIG. 7 is a front view thereof; and

FIG. 8 is a' perspective view of a worm having said cam formed thereupon.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a roll of recording sheet 1 comprising light sensitized sheet havinga photoconductive layer of zinc oxide or the like coated upon one surface thereof is loosely fitted over a stationary shaft. The rolled sheet 1 has perforations fonned along either or both side edges thereof. A rocking arm 5 pivotably carried by a shaft 6 extends toward the rolled recording sheet 1 and has a guide roller 2 rotatably carried at the free end thereof and a pair of

rollers

3 and 4 which serve as one electrode of a pair of electrodes, the other of which is shown by a wire electrode 7, for imparting the charge to the recording sheet 1. A feed roller 8 having a sprocket 10 formed integral therewith is carried by the drive shaft 9 at the side opposite to the guide roller 2 relative to the wire electrode 7. Upon rotation of the drive shaft 9, since the perforations of the recording sheet 1 engage with the sprocket teeth of the sprocket 10, the recording sheet is pulled from the roll. That is, the recording sheet 1 is guided by the guide roller 2, passes through the space between the

rollers

3 and 4 and the wire electrode 7 and is further advanced downwardly by the feed roller 9.

The electrostatically charging section constructed by. the above described

rollers

3 and 4 and the wire electrode 7 is energized at the instant when the drive shaft 9 is driven so that the recording sheet 1 with its sensitized surface directed downwardly is continuously electrically charged as the sheet is advanced by the sprocket 10 and the feed roller 8.

Below the feed roller 8 is disposed a recording sheet guide plate 11 which in turn is fixedly secured to a stationary member of the machine. Below the leading edge of the guide plate 11 are disposed a pair of

guide rollers

12 and 14. The roller 12 is rotatably carried by a stationary member of the machine while the roller 14 is rotatably carried by one end 13a of a rocking member 13 which in turn is pivotably mounted upon the stationary member of the machine. Furthermore, the guide roller I4 is imparted with a tendency of normally pressing against the guide roller 12 by a spring 15 interconnected between the leading end of an arm 13b integrally attached to the rocking member 13 and the upper end of a connecting lever 28 pivotably carried at the rear end 5a of the rocking arm 5.

Below the pair of guide rollers 12 and I4 is arranged and disposed a recording sheet exposure section comprising an information image projection device 16 such as a CRT or the like and a roller 17 which is normally pressed against the face plate of the device 16. The roller 17 is rotatably carried at one end 18a of a rocking member 18 pivotably mounted upon the stationary member of the machine and is normally pressed against the face plate 16a by a spring (not shown).

Below the exposure section is disposed a developing or processing section comprising a developing solution vessel 19 and a pair of developing rollers 20 and 21. The roller 20 is carried by a drive shaft 22 which rotates intermittently having a sprocket 23 formed integrally therewith while the roller 21 is rotatably carried at the one end 25a of a rocking member 25 loosely fitted over a shaft 24 extending from the stationary member of the machine. A spring 27 is interconnected between the other end 25b of the rocking member 25 and one end 26a of a rocking member 26 pivotably carried by a shaft 24. The other end 26b of the rocking member 26 is pivotably carried at the lower end 28a of the connecting rod 28 which in turn is pivotably carried at the upper portion of the rear end 5a of the rocking arm 5. As far as the rocking arm 5 is stationary, the rocking member 26 will not move back and forth so that the roller 21 is normally pressed against the roller 20 by the spring 27.

The recording sheet 1 advanced by the roller 8 and the sprocket 10 passes through the guide plate 11, the pair of

guide rollers

12 and 14, the exposure section, the developing rollers 20 and 21 and further advances by means of the sprocket 23 which engages with the perforations of the recording sheet 1. I

The information light image to be recorded is projected upon the recording sheet 1 at the projection device 16 in the exposure section so that electrostatic latent images are formed upon the sensitized surface of the recording sheet 1 successively as it passes through this section. The exposed recording sheet 1 is immersed by the roller 20 into a developing solution consisting of a carrier having resin coated carbon black suspended therein and a high electrical resistance, so that the electrostatic latent image is developed into a visible image. Thereafter, the recording sheet 1 is advanced out of the developing section through the rollers 20 and 21.

Beyond the rollers 20 and 21 are arranged a guide plate 29 which is securely fixed to the undersurface of the rocking member 26 and a roller supporting plate 30 which is securely fixed to the stationery member and made of a resilient material. At the leading end of the roller supporting plate 30 is rotatably carried a roller 31. A roller 33 is rotatably carried by a drive shaft 32 carried at the one end 26a of the rocking member 26 and is normally pressed by the roller 31. It will be seen that the developed recording sheet 1 is discharged out of the machine through the pair of rollers 31 and 32.

In the exposure section, the recording sheet 1 must stop stationarily for the time when the recording sheet 1 is exposed so that the shaft 22 carrying the developing roller 20 must be driven intermittently by an intermittent drive mechanism as shown in FIG. 2. 6

Referring to FIG. 2, a shaft 34 has at one end thereof a toothed wheel 36 which meshes with a toothed wheel 35 carried by the shaft 9 of the roller 8 and at the other end a cam 39 having a ridge 38 which is adapted to engage with a toothed wheel 37 carried by the shaft 22 of the roller 20. The toothed wheel 37 engages with the ridge 38 at the right side portion of the cam 39 when the toothed wheel 37 and the cam 39 are viewed from the side of the roller 20.

The cam 39 has a semicircular ridge 380 whose center coincides with center 0 of the cam 39 and a ridge 38c which is smoothly connected to one end 38!) of the ridge 38a and approaches gradually inwardly toward the center 0. The starting end 38d of the semicircular ridge 38a is spaced apart from its opposing point 38e of the ridge 380 by a distance corresponding to an exposure time of the recording sheet 1. Therefore, when the shaft 34 is rotated in the direction indicated by the arrow a continuously by a drive device (not shown), the toothed wheel 37 remains stationary when engaged with the semicircular ridge 380, but is caused to rotate in the direction indicated by the arrow b through an angle corresponding to the above distance between the starting end 38d and the point 38e when engaged with the ridge 380. Thus, it will be seen that the recording sheet is intermittently advanced or transported by the roller 20 and the sprocket 23 which rotate in unison with the toothed ,wheel which intermittently rotates as described hereinabove. In this case, during this intermittent advance the recording sheet 1 is stopped stationarily for the time during which it is exposed and this exposure time, that is the time when the advance of the recording sheet is stopped may be determined by a length of the ridge 38a. The ridge 380 may be arranged so as to be spaced away from the center 0 gradually outwardly.

The shaft 22 carries a sprocket 40 wheel while a tubular shaft 41 fitted loosely over the shaft 24 carries

sprocket wheels

42 and 43. Chain 44 is lapped over the

sprockets

40 and 42 so that the intermittent rotation of the toothed wheel 37 is transmitted to the sprocket wheel 43. A sprocket wheel 45 is carried by a shaft 32 and a chain 46 is lapped over this sprocket 45 and the sprocket 43 so that the rotation of the sprocket 43 is transmitted to the roller 33. Therefore, the recording sheet 1 which is advanced intermittently by the roller 20 and the sprocket 23 is intermittently discharged out of the machine without causing any slack because of the provision of the rollers 31 and 33.

When the recording sheet 1 has a long length as shown in this embodiment, it must be loaded in the machine along the passage thereof for charging, exposure and developing from the roller 2 to the pair of rollers 31 and 33.

Next, the description will be directed to the recording sheet path opening device for loading the recording sheet 1 in the machine along its path of feed. Referring back to FIG. 1, at the top end of the rocking arm 5 is rotatably carried a handle 47 which in turn has an engaging lever 48 and is adapted to engage with an engaging plate 49 fixedly secured to the stationary member. The engaging lever 48 has a tendency of normally pressing against the engaging plate 49 by means of a spring (not shown), but when the handle 47 is pulled toward the left in FIG. 1, the engaging lever 48 is released from the engagement with the engaging plate 49. When the handle 47 is raised after disengaging the engaging lever from the engaging plate 49, then the rocking arm 5 is caused to rotate in the counterclockwise direction in FIG. 1 about the shaft 6 so that the projection 5b formed at the lower portion of the rear end 50 abuts against the shaft 9 and stops at a position indicated by the chain line 5A. In this case, the connecting rod 28 is lowered down to the position indicated also by the chain line 28A so that the rocking member 26 is displaced toward the position indicated by the chain line 26A. Concurrently, a pin 50 extending from an intermediate area of the ends of the connecting rod 28 presses against the one end 13c of the rocking member 13 so that the rocking member 13 is displaced to the position indicated by the chain line 13A. 1

A pin 51 is attached to the one end of the rocking member 13 at a position opposing the one end 18b of the rocking member 18 so that the rocking member 13 pushes the one end 18b of the rocking member 18 through the pin 51, whereby the rocking member 18 is displaced to the position indicated by the chain line 18A. A pin 52 fixedly attached to the rocking member 26 pushes the one end 25b of the rocking member 25 when the rocking member 26 is being displaced so that the rocking member 25 is displaced to the position indicated by the chain line 25A. Thus, when the rocking arm 5 and the rocking

members

13, 18, 26 and 25 are displaced to their positions as described hereinabove, the

rollers

2, 3, 4, 14, 17, 21 and 33 can'ied by the above rocking arm and members respectively are also displaced so that the path of feed of the recording sheet is opened, whereby a long recording sheet 1 may be loaded into the machine along its feed path from the roller 2 to the pair of rollers 31 and 32.

The recording sheet 1 is advanced continuously down to the pair of

rollers

12 and 14 through the roller 8 and the sprocket 10 both of which are rotated continuously in the direction indicated by the arrow cin FIG. 2 from the drive device through the toothed wheel 38 in mesh with the toothed wheel 36 carried by the shaft 34. After having passed through the pair of

rollers

12 and 14, the recording sheet 1 is advanced intermittently through the roller 20 and the sprocket 23 which rotate intermittently.

In order that the recording sheet 1 may not be advanced in an irregular manner and may not be subjected to excesstension, a recording sheet slack forming mechanism comprised of a slack forming member 54 fixedly carried by a boss 53 loosely fitted over the shaft 6 in opposed relation with the guide plate 11 is disposed below the roller 8 and the sprocket 10. The slack forming member 54 is adapted to move back and forth in response to the operation of the recording sheet path opening mechanism constructed with the rocking arm 5 and other members as described hereinabove. That is, a pin 55 is fixed to a position adjacent to the shaft 6 of the rocking arm 5 so that the pin 55 pushes forward the slack forming member 54 when the rocking arm 5 is displaced to the position 5A indicated by the chain line so as to load the recording sheet 1 into the machine. Therefore, the slack forming member 54 is displaced to the position 54A indicated by the chain line so that between the slanting guide plate 11 and the slacking forming member- 54 slack is easily formed in the recording sheet. After the slacked portion is formed, the rocking arm 5 is returned to the position indicated by the solid line so that the slack forming member 54 is also returned to its initial position indicated by the solid line at which the member 54 depends. After the recording sheet 1 has been loaded in the machine, the continuous feed of the recording sheet 1 by the roller 8 and the sprocket 10 is suitably adjusted relative to the intermittent feed by the roller and the sprocket 23 so that the slack of the recording sheet 1 formed as described hereinabove may be maintained. The pair of

rollers

12 and 14 also serve to maintain this slack.

The developing solution vessel 19 has a developing solution tray or saucer 57 fixed to a supporting body 56 which in turn is rotatably carried by one side wall of the machine and within this tray 57 is disposed a recording sheet guide plate 58 having perforations formed therein along the path of the sheet. At the bottom of the developing solution vessel 19 is mounted a developing solution circulation pump 59 so that the developing solution contained in the vessel 19 is pumped by the pump 59 through a pipe 60 communicating the pump with the bottom of the developing solution tray 57 and ejected through the perforations of the guide plate 58 so that the exposed recording sheet 1 advanced by the developing roller 20 is immersed into the developing solution. After having developed the recording sheet 1, the solution overflows from the side edge of the developing solution tray 57 and is returned into the developing solution vessel 19.

In order to cause the movement of the developing solution tray 57 so that the level of the developing solution within the tray 57 may be moved up and down in response to a required developing time, a developing time adjustment mechanism is mounted upon the side wall of the developing solution vessel 19. That is, a rocking lever 620 having cam 62 formed integral therewith and adapted to contact with a depending fin 61a integrally formed with the supporting body 56 of the developing solution tray 57 is mounted upon the side wall 190 of the developing solution vessel '19. The configuration of this cam 62 is best shown in FIGS. 4 and 5 and when the rocking lever 62a is moved from the exterior of the machine, the cam 62 is also rocked so that the depending fin 61 in contact with the cam 62 is moved right and left in the figure. Since the leading edge of the cam 62 is curved or bent and is always in contact with the inner wall of the vessel 19, the cam 62 can securely support the depending fin 61, and the developing solution tray 57 may be held in a suitably inclined position. This cam 62 can have any other suitable configuration such as a disk. In this arrangement, the developing solution overflows from one side edge of the tray 57 so as to return it to the vessel 19 so that the level of the developing solution may be raised or lowered by the developing solution tray 57 which can be inclined so that the time during which the recording sheet 1 is immersed in the developing solution may be varied as needs demand.

At the discharge side of the roller 20, the sprocket 23 and the roller 21 is disposed a recording sheet guide plate 64 fixedly secured to a boss 63 fixedly carried by the shaft 24 in such a manner that the leading edge thereof is closely spaced apart from the roller 20. This guide plate 64 serves to prevent the recording sheet 1 from being wound around the roller 20 when the sheet 1 is loaded into the machine. A cleaner 65 which is pressed against the roller 21 is disposed at the one end 2511 of the rocking member 25 so that the toner, dust and the like attached to the roller 21 may be removed. A blower 66 is mounted below the rollers 31 and 32 so that dried air is supplied through

ducts

67 and 68 upon the developed recording sheet 1, thereby drying the same.

As mentioned above, the present invention is to provide an information recording device in which the successively electrically or optically transmitted information images can be projected and recorded upon the recording sheet of the electrostatic photography so that the high-speed information recording can be effected continuously and automatically without the necessity of any complicated process, thereby remarkably improving the information processing efficiency.

Next another embodiment of the intermittent drive device according to the present invention will be described with reference to FIGS. 6, 7 and 8.

A drive shaft 101 has a key 102 and above the drive shaft 101 is disposed a worm 103 adapted to engage with the key 102. The worm 103 has a pull-down cam which contacts with a stationary member 104 and is in mesh with a worm wheel 106. Let it be that the pitch of the worm 103 is P, the pull-down angle of the pull-down earn 105 an angle of a and the height thereof H given by the relation of H P x (360 a)/ 360. When the drive shaft 101 is rotated in the direction indicated by the arrow through a the worm 103 is lowered by a distance corresponding to the height H because of the interrelation of the worm 103 with the'stationary member 104 and the pull-down earn 105. In this case, the worm 103 causes the worm wheel 106 to rotate in the direction indicated by the arrow through an angle equal to P X 01560. That is upon rotation of the worm 103 through an angle of a, the worm wheel 106 is rotated in the direction indicated by the arrow through an angle equal to 0: 360 a a ier? W T s Then, the worm 103 rotates through an angle of (360 a), but since the resistance between the drive shaft 101 and the worm 103 is extremely small, the worm 103 can not rotate the worm wheel 106 but rises by a distance equal to P X (360 a)/ 360 H, thereby returning its initial position. That is, when the drive shaft 101 makes contact on rotation the worm 103 rotates through an angle of a so that the worm 106 is rotated through an angle corresponding to the pitch P, but when the worm 103 rotates through the remaining angle of 360 -a the worm wheel 106 is not rotated. Thus, the worm wheel 106 is intermittently rotated.

From the foregoing, it is obvious that in the intermittent drive device of the present invention, the worm and the worm wheel are utilized so that the pull-down cam formed upon the worm imparts the intermittent rotation of the worm wheel, whereby positive and reliable intermittent rotation or drive can be ensured. Furthermore, the pull-down angle a may be freely selected as needs demand so that various intermittent rotation or drive may be arbitarily selected very advantageously.

The present invention has been so far described in detail with particular reference to the preferred embodiments thereof, but it will be understood that variations and modifications can be eflected without departing from the true spirit thereof as described hereinabove and as defined in the appended claims.

lclaim:

1. An information recording device comprising:

means for optically displaying the information transmitted;

a recording sheet;

means for imparting said recording sheet with an electrostatic charge;

means for providing a slack portion in said recording sheet;

means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon;

means for developing the latent image formed on said recording sheet; means for drying said developed recording sheet;

means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and

said means for advancing said recording sheet includes an 2. An information recording device comprising means for optically displaying the information transmitted;

a recording sheet; means for imparting said recording sheet with an electrostatic charge;

means for providing a slack portion in said recording sheet; means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon;

means for developing the latent image formed on said recording sheet;

means for drying said developed recording sheet; means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and

said providing means for advancing said recording sheet ineludes an intermittent drive mechanism comprising a worm carried by a drive shaft slidably of the axis of said shaft, and a worm wheel in mesh with said worm, said worm having a pull-down cam which contacts a stationary member so that said worm is caused to slide axially of said shaft upon rotation of said wonn. 3. An information recording device comprising means for optically displaying the information transmitted; a recording sheet; means for imparting said recording sheet with an electrostatic charge; means for providing a slack portion in said recording sheet; means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon; I means for developing the latent image formed on said recording sheet; mean for drying said developed recording sheet; means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and said recording sheet slack providing means comprises a member which is adapted to advance into the path of said recording sheet between said recording sheet feed roller disposed upwardly of said exposure means and said exposure means in response to said opening of said feed path of said recording sheet by said recording sheet path opening mechanism and to retract from said first mentioned path upon closing of said feed path of said recording sheet.

Claims

1. An information recording device comprising: means for optically displaying the information transmitted; a recording sheet; means for imparting said recording sheet with an electrostatic charge; means for providing a slack portion in said recording sheet; means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon; means for developing the latent image formed on said recording sheet; means for drying said developed recording sheet; means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and said means for advancing said recording sheet includes an intermittent drive mechanism comprising a cam having an arcuate ridge whose center coincides with the center of rotation of said cam and another ridge which is smoothly interconnected to one end of said first mentioned arcuate ridge and gradually approaches toward or moves away from said center of rotation, and a toothed wheel in mesh with said ridges and carried by a drive shaft.

2. An information recording device comprising means for optically displaying the information transmitted; a recording sheet; means for imparting said recording sheet with an electrostatic charge; means for providing a slack portion in said recording sheet; means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon; means for developing the latent image formed on said recording sheet; means for drying said developed recording sheet; means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and said providing means for advancing said recording sheet includes an intermittent drive mechanism comprising a worm carried by a drive shaft slidably of the axis of said shaft, and a worm wheel in mesh with said worm, said worm having a pull-down cam which contacts a stationary member so that said worm is caused to slide axially of said shaft upon rotation of said worm.

3. An information recording device comprising means for optically displaying the information transmitted; a recording sheet; means for imparting said recording sheet with an electrostatic charge; means for providing a slack portion in said recording sheet; means for exposing said recording sheet by light rays from said optically displayed information to form a latent image thereon; means for developing the latent image formed on said recording sheet; mean for drying said developed recording sheet; means for advancing said recording sheet including guide rollers, feed rollers, pressure rollers and discharge rollers disposed at spaced positions in said device for advancing said recording sheet along a feed path in said device in a predetermined state, said rollers adapted to be displaced at said positions to open said feed path upon actuation of means operable from the exterior of said device; and said recording sheet slack providing means comprises a member which is adapted to advance into the path of said recording sheet between said recording sheet feed roller disposed upwardly of said exposure means and said exposure means in response to said opening of said feed path of said recording sheet by said recording sheet path opening mechanism and to retract from said first mentioned path upon closing of said feed path of said recording sheet.