Feeding apparatus

Abstract

A large turntable is mounted rotatably on a tray, and two paper cassettes are rotatably installed on the turntable. The turntable is rotated by a 180-degree rotating mechanism and a small angle rotating mechanism, while the paper cassette is rotated by a cassette rotating mechanism. The 180-degree rotating mechanism interchanges the paper cassette on a feeding side and the paper cassette on a non-feeding side by rotating the turntable. The small angle rotating mechanism aligns the center of paper stored in the paper cassette on the feeding side with a feeding center line by rotating the turntable. The cassette rotating mechanism positions the leading edge of the paper in the paper cassette on the feeding side at right angles to a feeding direction by rotating the paper cassette. Since the 180-degree rotating mechanism and the small angle rotating mechanism are installed in positions on the tray outside of the turning space of the turntable, an apparatus of a reduced height and size is achieved.

Description

FIELD OF THE INVENTION

The present invention relates to a feeding apparatus incorporating a plurality of paper cassettes capable of storing and feeding paper.

BACKGROUND OF THE INVENTION

For example, a copying machine incorporates a feeding apparatus that supplies paper onto which an image on a document is to be copied. There has been a great demand for feeding apparatuses that are capable of supplying paper of various sizes according to the size of a document to be copied and in response to requests for making enlarged or reduced copies.

The following are some examples of conventional feeding apparatuses of this type. An apparatus showing in FIGS. 47 and 48 is provided with a plurality of box-shaped paper cassettes 62 which are mounted around a rotatable supporting rod 61. In this copying machine, any of the paper cassettes 62 can be selectively placed in front of the feeding opening 64 of the main body 63 by rotating the supporting rod 61.

As for next example, as illustrated in FIGS. 49 and 50, an apparatus includes a rotatable circular plate 51 on which a plurality of paper guides 52 are mounted. A plurality of paper trays 54 for storing paper 53 are formed by the circular plate 51 and the paper guides 52. In this case, by rotating the circular plate 51, the paper 53 is supplied from the respective paper trays 54 to the main body of the copying machine.

However, in order to achieve an effective use of space, a feeding apparatus is usually installed, for example, under a copying machine. In such a case, feeding apparatuses of reduced heights are installed over a plurality of stages so that various types of paper is supplied. In the case of the feeding apparatus shown in FIGS. 47 and 48, on the contrary, the paper cassettes 62 are attached to the supporting rod 61 such that the direction of feeding paper is parallel to the axial direction of the supporting rod 61. This apparatus when installed under a copying machine prevents an effective use of space. In other words, if such a feeding apparatus is incorporated into a copying machine, it causes an increase in the size of the copying machine overall.

As for the feeding apparatus shown in FIGS. 49 and 50, it can be installed under a copying machine for aiming at an effective use of space. However, when paper stored in the paper tray 54 is replaced with paper of a different size, this apparatus is incapable of aligning the center of the paper with a feeding center line, i.e., the center line in the paper feeding mechanism for transport of paper. Namely, this apparatus is unable to feed paper while aligning the paper center with the feeding center line. Thus, there is a need to provide a paper tray for each size of paper, thereby causing an increase in the size of the apparatus.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a feeding apparatus capable of feeding paper of various sizes.

Another object of the present invention is to provide a small and thin feeding apparatus.

In order to achieve the above objects, a feeding apparatus of the present invention includes at least the following means:

(a) carrying member mounted rotatably on a base member;

(b) a plurality of storing means installed rotatably on the carrying member;

(c) first rotation driving means installed in a position on the base member outside of the turning space of the carrying member, for rotating the storing means;

(d) second rotation driving means for rotating the storing means on the carrying member;

(e) first controller means for controlling the first rotation driving means, for interchanging the storing means on a feeding side and the storing means on a non-feeding side;

(f) second controller means for controlling the first rotation driving means, for aligning a center line of paper stored in the storing means on the feeding side with a feeding center line; and

(g) third controller means for controlling the second rotation driving means, for positioning the paper stored in the storing means on the feeding side at right angles to the feeding direction.

With this configuration, control of the first rotation driving means by the first and second controller means allows the storing means on the feeding side and the storing means on the non-feeding side to be interchanged and the center of the paper stored in the storing means on the feeding side to be aligned with the feeding center line. In addition, since the third controller means controls the second rotation driving means, the storing means is rotated on the carrying member so as to position the paper stored in the storing means on the feeding side at right angles to the feeding direction.

With this configuration, even if paper of different sizes is stored in the storing means, it is possible to align the paper center with the feeding direction. Therefore, each storing means can handle paper of various sizes.

Moreover, since the first rotation driving means is installed in a portion on the base member outside of the turning space of the carrying member, an effective use of space is achieved. And, this makes it possible to reduce the height of the apparatus. Thus, this arrangement and the plurality of storing means enable the size and the height of the feeding apparatus capable of feeding paper of various sizes to be decreased considerably.

For a fuller understanding of the nature and advantages of the invention, reference should be made to the ensuing detailed description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view illustrating a rotatable cassette unit according to one embodiment of the present invention.

FIG. 2 is a view illustrating the rotatable cassette unit from the U side shown in FIG. 1.

FIG. 3 is a front view illustrating the structure of a copying machine including a multi-stage feeding device having the rotatable cassette unit shown in FIG. 1.

FIG. 4 is a cross section of a 180-degree rotating mechanism cut across the 0--0 line shown in FIG. 5.

FIG. 5 is an enlarged front view of the 180-degree rotating mechanism shown in FIG. 1.

FIG. 6 is a side view of the 180-degree rotating mechanism shown in FIG. 5.

FIG. 7 is a cross section of a small angle rotating mechanism cut across the line P--P shown in FIG. 8.

FIG. 8 is an enlarged front view of the small angle rotating mechanism shown in FIG. 1.

FIG. 9 is a side view of the small angle rotating mechanism shown in FIG. 8.

FIG. 10 is an enlarged view illustrating a carriage driving mechanism and a cassette rotating mechanism installed on one side of a large turntable shown in FIG. 1, and is also a cross sectional plan view of FIG. 11 cut across the Q--Q line.

FIG. 11 is a front view of the cassette rotating mechanism shown in FIG. 1.

FIG. 12 is a plan view illustrating the structure of a pulley shaft shown in FIG. 10 and its periphery.

FIG. 13 is a cross section of FIG. 12 cut across the R--R line.

FIG. 14 is an enlarged view of a carriage driving mechanism and a cassette rotating mechanism installed on the other side of the turntable shown in FIG. 1, and is also a cross sectional plan view of FIG. 15 cut across the T--T line.

FIG. 15 is a front view of the cassette rotating mechanism shown in FIG. 1.

FIG. 16 is a plan view illustrating the structure of a cassette rotation shaft shown in FIG. 15 and its periphery.

FIG. 17 is a cross section of FIG. 16 cut across the S--S line.

FIG. 18 is a block diagram illustrating a control system of the rotatable cassette unit shown in FIG. 1.

FIG. 19 is a view explaining the operation of the 180-degree rotating mechanism shown in FIGS. 4 through 6.

FIG. 20 is a view explaining the operation of the small angle rotating mechanism shown in FIGS. 7 through 9.

FIG. 21 is a schematic plan view illustrating the operation of the carriage driving mechanism shogun in FIGS. 10 and 11.

FIG. 22 is a schematic front view illustrating the movement of a paper cassette caused by the movement of the carriage shown in FIG. 21.

FIG. 23 is an explanatory view illustrating patterns of mode switching executed by the 180-degree rotating mechanism, small angle rotating mechanism, carriage driving mechanisms and cassette rotating mechanisms shown in FIGS. 4 through 17.

FIG. 24 is an explanatory view illustrating operations constituting the mode switching patterns shown in FIG. 23, controlled by a microcomputer shown in FIG. 18.

FIG. 25 is a graph illustrating the relations between the turning angle (.theta.) of the rotation shaft of the turntable and the turning angles (.phi..sub.A and .phi..sub.B) of the cassette rotation shafts of the paper cassettes on the feeding side and non-feeding side and time during Operation 1 shown in FIG. 23.

FIG. 26 is a graph illustrating the relations between the travel distances (r.sub.A and r.sub.B) of the carriages on the feeding side and non-feeding side and time during Operation 1 shown in FIG. 23.

FIG. 27 is an explanatory view illustrating the locations of the cassette rotation shafts and the paper cassettes at time a.sub.1 through time d.sub.1 with relation to the rotation of the turntable's rotation shaft and of the cassette rotation shafts shown in FIG. 25 and the movements of the carriages shown in FIG. 26.

FIG. 28 is an explanatory view illustrating the relation among the feeding center line SL.sub.S, the paper center S.sub.P of B5-sized paper stored in the paper cassette and the cassette rotation shaft G.sub.A when the paper cassette is placed in the sideways feed position.

FIG. 29 is an explanatory view illustrating the relation among the feeding center line SL.sub.S, the paper center S.sub.P of B5-sized paper stored in the paper cassette and the cassette rotation shaft G.sub.A when the paper cassette is placed in the lengthways feed position.

FIG. 30 is an explanatory view illustrating the relation among the feeding center line SL.sub.S, the paper center S.sub.P of A4-sized paper stored in the paper cassette and the cassette rotation shaft G.sub.A when the paper cassette is placed in the sideways feed position.

FIG. 31 is an explanatory view illustrating the relation among the feeding center line SL.sub.S, the paper center S.sub.P of A4-sized paper stored in the paper cassette and the cassette rotation shaft G.sub.A when the paper cassette is placed in the lengthways feed position.

FIG. 32 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time a.sub.1 during Operation 1 shown in FIGS. 25 and 26.

FIG. 33 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time c.sub.1 during Operation 1 shown in FIGS. 25 and 26.

FIG. 34 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time d.sub.1 during Operation 1 shown in FIGS. 25 and 26.

FIG. 35 is a graph illustrating the relations between the turning angle (.theta.) of the rotation shaft of the turntable and the turning angles (.phi..sub.A and .phi..sub.B) of the cassette rotation shafts of the paper cassettes on the feeding side and non-feeding side and time during Operation 2 shown in FIG. 23.

FIG. 36 is a graph illustrating the relations between the travel distances (r.sub.A and r.sub.B) of the carriages on the feeding side and non-feeding side and time during Operation 2 shogun in FIG. 23.

FIG. 37 is an explanatory view illustrating the locations of the cassette rotation shafts and the paper cassettes at time a.sub.2 through time c.sub.2 with relation to the rotation of the turntable's rotation shaft and of the cassette rotation shafts shown in FIG. 35 and the movements of the carriages shown in FIG. 36.

FIG. 38 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time a.sub.2 during Operation 2 shown in FIGS. 35 and 36.

FIG. 39 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time c.sub.2 during Operation 2 shown in FIGS. 35 and 36.

FIG. 40 is a graph illustrating the relations between the turning angle (.theta.) of the rotation shaft of the turntable and the turning angles (.phi..sub.A and .phi..sub.B)

of the cassette rotation shafts of the paper cassettes on the feeding side and non-feeding side and time during Operation 3 shown in FIG. 23.

FIG. 41 is a graph illustrating the relations between the travel distances (r.sub.A and r.sub.B) of the carriages on the feeding side and non-feeding side and time during Operation 3 shown in FIG. 23.

FIG. 42 is an explanatory view illustrating the locations of the cassette rotation shafts and the paper cassettes at time a.sub.3 through d.sub.3 with relation to the rotation of the turntable's rotation shaft and of the cassette rotation shafts shown in FIG. 40 and the movements of the carriages shown in FIG. 41.

FIG. 43 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time a.sub.3 during Operation 3 shown in FIGS. 40 and 41.

FIG. 44 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time c.sub.3 during Operation 3 shown in FIGS. 40 and 41.

FIG. 45 is an explanatory view illustrating the states of the turntable, carriages and paper cassettes at time d.sub.3 during Operation 3 shown in FIGS. 40 and 41.

FIG. 46 is a view explaining the rotation of the turntable according to Operation 4 shown in FIG. 23.

FIG. 47 is a schematic perspective view illustrating a conventional feeding apparatus.

FIG. 48 is a schematic perspective view illustrating another type of installation of paper cassettes on the supporting rod of the feeding apparatus shown in FIG. 47.

FIG. 49 is a schematic plan view illustrating another conventional feeding apparatus.

FIG. 50 is a schematic front view illustrating a feeding state of the feeding apparatus shown in FIG. 49.

DESCRIPTION OF THE EMBODIMENTS

With reference to FIGS. 1 through 46, the following will describe one embodiment of the present invention.

As illustrated in FIG. 3, a copying machine is composed of a main body 1 and a multi-stage feeding device 2 located under the main body 1. The multi-stage feeding device 2 includes, from the bottom upward, a stationary cassette unit 3, rotatable cassette units 4 and 5 as feeding apparatuses, and a tray unit 6. The stationary cassette unit 3 and the rotatable cassette units 4 and 5 store copy paper, respectively. The copy paper is supplied via a paper transport path 10 to the main body 1 by a common feeding system using feeding rollers 8 and transport rollers 9. And, the tray unit 6 receives the paper having a copied image thereon, discharged from the main body 1.

A sliding mechanism 7 is installed on each side of the respective units 3 to 6 and on the corresponding internal walls of the housing 2a of the multi-stage feeding device 2. The sliding mechanisms 7 enable the units 3 to 6 to be pulled out of the multi-stage feeding device 2 from the front of the copying machine. With the above configuration and two types of rotatable plane cassette mechanisms, to be described later, it is possible to feed an increased number of paper sheets or paper types, including lengthways and sideways feed, to the main body 1 of the copying machine without expanding its floor area.

As illustrated in FIGS. 1 and 2, each of the rotatable cassette units 4 and 5 has a tray 100 as a base member and a large turntable 200 as a carrying member. The turntable 200 is mounted rotatably on the center of the floor of the tray 100 in parallel with the tray 100. A carriage 300 is installed on each side of the upper face of the turntable 200 so that it can move straight forward and backward in a longitudinal direction of the turntable 200. A paper cassette 400 as storing means is mounted rotatably on each carriage 300 parallel with the tray 100. The tray 100 is quadrangular in shape, and the lengths of its sides are substantially equal to the diameter of rotation of the turntable 200.

The rotatable cassette units 4 and 5 adopt a centering system. With this system, when feeding paper, the center of paper (hereinafter referred to as paper center S.sub.P) stored in the paper cassette 400 is aligned with the center line in the feeding section of the multi-stage feeding device 2 for transport of paper (hereinafter called feeding center line SL.sub.S).

The turntable 200 is rotated around a rotation shaft 201, and its circumferential edges in the longitudinal direction are formed like arcs of a circle around the rotation shaft 201. As illustrated in FIGS. 11 and 15, the normal load applied to the turntable 200 by the paper cassettes 400 storing paper is borne by fourteen supporting rollers 102 and a thrust bearing 103. The supporting rollers 102 are attached to supporting members 101 on the floor of the tray 100. As illustrated in FIG. 1, eight of the supporting rollers 102 are installed on an inner portion of the turntable 200 at intervals of 45 degrees and six are on an outer portion thereof at intervals of 30 degrees. Meanwhile, the thrust bearing 103 is inserted into a double pulley 204. The double pulley 204 is provided for timing belts 230 and 268, and attached to the rotation shaft 201.

The turntable 200 is rotated by a 180-degree rotating mechanism 210 (rotation driving mechanism for interchange) and a small angle rotating mechanism 250 (rotation driving mechanism for adjustment). The 180-degree rotating mechanism 210 and small angle rotating mechanism 250 are respectively disposed at the corners of the tray 100 on a non-feeding side, outside of the turning space EL of the turntable 200 shown by the large circle of the alternate long and two short dashes line in FIG. 1. The non-feeding side is located opposite to a feeding side 11.

As illustrated in FIGS. 4 through 6, the lower supporting plate 211 of the 180-degree rotating mechanism 210 is placed above and supported parallel with the tray 100 by a plurality of stays 212. The upper supporting plate 213 thereof is placed above and supported parallel with the lower supporting plate 211 by a plurality of stays 214. First to fourth shafts, 215 to 218, are installed between the lower supporting plate 211 and the upper supporting plate 213, and a DC motor 219 is mounted on the upper supporting plate 213. The top and bottom ends of the first shaft 215 and of the forth shaft 218 are rotatably held in oil impregnated metal powder sintered bearings 220. Meanwhile, the top and bottom ends of the second shaft 216 and of the third shaft 217 are fixed to the upper and lower supporting plates 213 and 211, respectively.

A gear 222 is attached rotatably to an upper portion of the first shaft 215, and engages with a motor gear 221 attached to the rotation shaft of the DC motor 219. While, a gear 224 is fixed to a lower portion thereof with screws. And, a clutch 223 is fixed to a portion of the first shaft 215 between the gear 222 and gear 224 with screws. The clutch 223 connects or disconnects the transmission of the driving force between the gears 222 and 224. A double gear 225 is attached rotatably to the second shaft 216 and engages with the gear 224, while a double gear 226 is attached rotatably to the third shaft 217 and engages with the double gear 225. The double gears 225 and 226 are respectively positioned by E-rings 227. A timing pulley gear 228 is fixed to a portion of the fourth shaft 218 between the lower and upper supporting plates 211 and 213 with screws and engages with the double gear 226. While, a timing pulley 229 is fixed to a portion thereof between the lower supporting plate 211 and the tray 100 with screws.

Through a timing belt 230, the timing pulley 229 is connected to the lower stage of the double pulley 204 attached to the rotation shaft 201. As a result, the power of the DC motor 219 is transmitted via a series of power-transmission gears, timing pulley 229, timing belt 230 and double pulley 204 to the rotation shaft 201. The series of power-transmission gears includes the motor gear 221, gear 222, clutch 223, gear 224, double gears 225 and 226 and timing pulley gear 228. Then, the turntable 200 is rotated by 180 degrees (a first angle of rotation).

The driving force of the DC motor 219 is transmitted to the rotation shaft 201 at a reduction gear ratio i.sub.3 which is smaller than a reduction gear ratio i.sub.4 of the small angle rotating mechanism 250. The reasons why the reduction gear ratio i.sub.3 is set smaller than the reduction gear ratio i.sub.4 of the small angle rotating mechanism 250 are as follows. To shorten the operation time, the 180-degree rotating mechanism 210 must rotate the turntable 200 at faster speeds than the small angle rotating mechanism 250 rotates the turntable 200. Because, the 180-degree rotating mechanism rotates the turntable 200 by a large angle, 180 degrees, and, unlike the small angle rotating mechanism 250, its operation is performed independently of the operations of carriage driving mechanisms 310 and cassette rotating mechanisms 410.

Next, the following will describe the small angle rotating mechanism 250. As illustrated in FIGS. 7 through 9, the lower supporting plate 251 of the small angle rotating mechanism 250 is placed above and supported parallel with the tray 100 by a plurality of stays 252. Meanwhile, its upper supporting plate 253 is placed above and supported parallel with the lower supporting plate 251 by a plurality of stays 254. First to third shafts, 255 to 257, are installed between the lower and upper supporting plates 251 and 253, and a pulse motor 258 is mounted on the lower supporting plate 251 with a motor supporting member 259. The top and bottom ends of the second shaft 256 and of the third shaft 257 are rotatably held in oil impregnated metal powder sintered bearings 260. In the meantime, the top and bottom ends of the first shaft 255 are fixed to the upper supporting plate 253 and lower supporting plate 251, respectively.

A double gear 262 is positioned by an E-ring 263a and attached rotatably to the first shaft 255, and engages with a motor gear 261 attached to the rotation shaft the pulse motor 258. A gear 263 is attached rotatably to an upper portion of the second shaft 256 and engages with the double gear 262, while a gear 264 is fixed to a lower portion thereof with screws. And, a clutch 265 is fixed to a portion of the second shaft 256 between the gears 263 and 264 with screws. The clutch 265 connects and disconnects the transmission of the driving force between the gears 263 and 264. A timing pulley gear 266 is fixed to a portion of the third shaft 257 between the lower and upper supporting plates 251 and 253 with screws and engages with the gear 264. Besides, a timing pulley 267 is fixed to a portion thereof between the lower supporting plate 251 and the tray 100 with screws.

Through a timing belt 268, the timing pulley 267 is connected to the upper stage of the double pulley 204. Consequently, the power of the pulse motor 258 is transmitted to the rotation shaft 201 via a series of power-transmission gears, timing pulley 267, timing belt 268 and double pulley 204 at the reduction gear ratio i.sub.4. The series of power-transmission gears includes the motor gear 261, double gear 262, gear 263, clutch 265, gear 264 and timing pulley gear 266. Then, the turntable 200 is rotated by a small angle (a second angle of rotation).

As illustrated in FIG. 1, two slide supporting bars 301 are installed on each side of the turntable 200 in a cross direction. The slide supporting bars 301 are horizontally disposed on a level in a longitudinal direction of the turntable 200 so that they are parallel with the turntable 200. As shown in FIGS. 10 and 11, each slide supporting bar 301 passes through a pair of bar supporting sections 202 in parallel with the turntable 200 and is fixed by E-rings 302. The bar supporting section 202 is formed by cutting and raising a part of the turntable 200.

Bearings 303 are mounted on the bottom surfaces of the carriages 300 so that the carriages 300 are installed slidably on the slide supporting bars 301. As shown in FIG. 1, the carriages 300 are provided with the carriage driving mechanisms 310 and the cassette rotating mechanisms 410 as second rotation driving means. These mechanisms 310 and 410 are disposed symmetrically with respect to the rotation shaft 201. The carriage driving mechanisms 310 drive the carriages 300 so that they can slide over the slide supporting bars 301.

The carriage driving mechanism 310 includes a pulse motor 311 mounted on the bottom surface of the carriage 300, a fixed shaft 312 secured to the upper surface thereof, and a pulley shaft 313. Attached rotatably to the fixed shaft 312 is a double gear 315 which engages with a motor gear 314. The motor gear 314 is attached to the rotation shaft of the pulse motor 311. The pulley shaft 313 passes through the carriage 300 vertically. And, as illustrated in FIGS. 12 and 13, a near central portion and an upper portion thereof are supported via radial bearings 317 and 318 by the carriage 300 and a cassette supporting circular plate 411, respectively. Also, a pulley gear 316 is fixed to a portion of the pulley shaft 313 between the radial bearings 317 and 318 with screws and engages with the double gear 315. Meanwhile, a wire pulley 319 is fixed to a lower portion thereof with screws.

Accordingly, the power of the pulse motor 311 is transmitted to the wire pulley 319 at a reduction gear ratio i.sub.1 via a series of power-transmission gears, including the motor gear 314, double gear 315 and pulley gear 316.

A wire 320 is wound around and fastened to the central portion of the wire pulley 319 with screws. As illustrated in FIG. 10, both ends of the wire 320 are connected to the wire joint sections 203 through springs 322 for preventing looseness so that the wire 320 can extend along the slide supporting bars 301. The wire joint sections 203 are formed in the vicinity of the bar supporting sections 202 by cutting and raising a part of the turntable 200.

In this arrangement, the carriage 300 is moved toward the rotation shaft 201 of the turntable 200 or the opposite direction according to a rotation of the wire pulley 319, i.e., the normal rotation or the reverse rotation of the pulse motor 311. In relation to the movement of the carriage 300, as shown in FIGS. 1 and 15, the non-feeding side of the tray 100 is provided with an opening 401 which permits the carriage 300 and paper cassette 400 on the non-feeding side to protrude from the tray 100.

As illustrated in FIGS. 14 and 15, the carriage 300 is provided with the cassette rotating mechanism 410. The cassette rotating mechanism 410 includes the cassette supporting circular plate 411 for supporting the paper cassette 400, a pulse motor 413, fixed shafts 414 and 415, and a cassette rotation shaft 416. The cassette supporting circular plate 411 is mounted parallel with the carriage 300 through three spacers 412 shown in FIG. 14. The pulse motor 413 is mounted on the bottom surface of the carriage 300, and the fixed shafts 414 and 415 are secured to the upper surface thereof. And, the cassette rotation shaft 416 passes through the carriage 300 vertically.

A motor gear 417 is attached to the rotation shaft of the pulse motor 413. A double gear 418 is attached rotatably to the fixed shaft 414 and engages with the motor gear 417. While, a double gear 419 is attached rotatably to the fixed shaft 415 and engages with the double gear 418. As illustrated in FIG. 17, a near central portion of the cassette rotation shaft 416 is supported through a radial bearing 420 by the carriage 300, while a lower portion thereof is supported through an oil impregnated metal powder sintered bearing 422 by a U-shaped member 421.

The U-shaped member 421 is mounted on the bottom surface of the carriage 300. A cassette gear 423 is fixed to an upper portion of the cassette rotation shaft 416 with screws, and engages with the double gear 419. Accordingly, the power of the pulse motor 413 is transmitted to the cassette rotation shaft 416 at a reduction gear ratio i.sub.2 via a series of power-transmission gears, including the motor gear 417, double gears 418 and 419 and cassette gear 423.

As illustrated in FIG. 16, the top end of the cassette rotation shaft 416 is inserted from an opening formed on the cassette supporting circular plate 411 into a cassette connecting circular plate 424 installed on the bottom surface of the paper cassette 400 with screws 427. A joining socket 425 is formed on the cassette connecting circular plate 424, while a connecting pin 426 is secured to the top end of the cassette rotation shaft 416. By joining the connecting pin 426 to the joining socket 425, the cassette rotation shaft 416 is connected to the central portion of the paper cassette 400. Disposed between the cassette connecting circular plate 424 and the cassette supporting circular plate 411 is a thrust bearing 428 for supporting the paper cassette 400 rotatably. This configuration enables the paper cassette 400 to be rotated depending on the normal rotation or reverse rotation of the pulse motor 413.

A microcomputer 20 as first to third controller means shown in FIG. 18 controls:

the 180-degree rotating mechanism 210 to rotate the turntable 200 around the rotation shaft 201;

the small angle rotating mechanism 250 to rotate the turntable 200 (hereinafter referred to as .theta.-axis driving);

the carriage driving mechanisms 310 to move the carriages 300 and paper cassettes 400 over the slide supporting bars 301, i.e. in a radial direction of rotation of the turntable 200 (r-axis driving); and

the cassette rotating mechanisms 410 to rotate the paper cassettes 400 around the cassette rotation shaft 416 (.phi.-axis driving).

More specifically, the microcomputer 20 controls the .theta.-axis driving, r-axis driving and .phi.-axis driving simultaneously such that the paper cassette 400 storing paper of a selected size is set in a feed position while aligning the paper center S.sub.p with the feeding center line SL.sub.S. At this time, the microcomputer 20 controls the DC motor 219, clutch 223, pulse motor 258, clutch 265, pulse motor 311, and pulse motor 413 as described below.

As for a selection of paper, paper to be used is selected based on an input entered by an operator through a cassette selection key 30, a document's size and position, i.e., whether it is placed lengthways or sideways detected by a sensor (not shown), or a detection signal from the sensor and a specified copying mode, such as enlarged copying and reduced copying. In this embodiment, suppose that B5-sized paper and A4-sized paper are stored in the two paper cassettes 400 of each of the rotatable cassette units 4 and 5, B5, B5R, A4 and A4R paper are available. B5R and A4R mean lengthways feed of B5 and A4 size paper, respectively.

Based on the above arrangement, the following will explain the operations of the 180-degree rotating mechanism 210, small angle rotating mechanism 250, carriage driving mechanisms 310 and cassette rotating mechanisms 410, separately.

As illustrated in FIG. 19, the 180-degree rotating mechanism 210 simply turns the turntable 200 by 180 degrees so as to interchange the paper cassette 400 on the feeding side 11 and the paper cassette 400 on the non-feeding side. At this time, the power of the DC motor 219 is increased at the reduction gear ratio i.sub.3 and transmitted to the rotation shaft 201 through the series of power-transmission gears shown in FIGS. 4 through 6, timing belt 230 and double pulley 204. The position of the turntable 200 is after the 180-degree rotation detected by a sensor 21 shown in FIG. 18. Then, according to a detection signal from the sensor 21, the microcomputer 20 controls the DC motor 219 so that the turntable 200 is positioned accurately. When the 180-degree rotating mechanism 210 is actuated, the microcomputer 20 controls the clutch 223 of the series of power-transmission gears to be turned ON so that the power of the DC motor 219 is transmitted. On the contrary, when the small angle rotating mechanism 250 is actuated as to be described later, it is turned OFF in order to cutoff the power transmission of the DC motor 219.

During .theta.-axis driving by the small angle rotating mechanism 250, the power of the pulse motor 258 is increased at the reduction gear ratio i.sub.4 and transmitted to the rotation shaft 201 by the series of power-transmission gears shown in FIGS. 7 through 9, timing belt 268 and double pulley 204. In consequence, the turntable 200 is rotated by a small angle as illustrated in FIG. 20. This rotation is controlled by the microcomputer 20 such that the paper center S.sub.P of the paper stored in the paper cassette 400 on the feeding side 11 aligns with the feeding center line SL.sub.S depending on lengthways feed or sideways feed. When the small angle rotating mechanism 250 is actuated, the clutch 265 of the series of power-transmission gears is turned ON to transmit the power of the pulse motor 258. On the other hand, when the 180-degree rotating mechanism 210 is actuated, it is turned OFF to cutoff the power transmission of the pulse motor 258.

During r-axis driving by the carriage driving mechanism 310, the power of the pulse motor 311 is increased at the reduction gear ratio i.sub.1 and transmitted to the wire pulley 319 attached to the pulley shaft 313 through the series of power-transmission gears shown in FIGS. 10 and 11. The microcomputer 20 controls the carriage driving mechanism 310 on the feeding side 11 to drive the carriage 300 such that the paper cassette 400 is moved into an interchanging position, a sideways feed position or a retracted position.

The interchanging position is a position where the two paper cassettes 400 placed side by side come into the closest proximity of the rotation shaft 201. It is defined in this embodiment that at the interchanging position the sides of the paper cassettes 400 come into contact with each other on the rotation shaft 201. The sideways feed position is a position where, as shown in FIG. 32, the paper cassette 400 on the feeding side 11 is placed for sideways feed and its leading edge aligns with a predetermined cassette leading edge setting line H. The retracted position is a position where, as illustrated in FIG. 33, the paper cassette 400 on the feeding side 11 is retraced toward the non-feeding side so as to prevent it from protruding from the cassette leading edge setting line H during switching of the position of paper between lengthways and sideways feed.

When the paper cassette 400 is moved into the interchanging, sideways feed or retracted position, as shown in FIG. 21, the cassette rotation shaft 416 is moved to an interchanging point P.sub.O, a sideways feed point P.sub.H or a retracted point P.sub.R, respectively. FIG. 22 shows the movement of the paper cassette 400. Here, the interchanging point P.sub.O is defined as a reference point with respect to the movement of the paper cassette 400 driven by the carriage driving mechanism 310. With respect to the interchanging point P.sub.O, a direction toward the rotation shaft 201, i.e., toward the retracted point P.sub.R is regarded as a negative (-) direction and the opposite direction, i.e., toward the sideways feed point P.sub.H is a positive (+) direction.

Also, the carriage driving mechanism 310 on the non-feeding side drives the carriage 300 such that the paper cassette 400 on the non-feeding side is moved between the interchanging position and a clearance position. The clearance position is a position where the paper cassette 400 on the non-feeding side protrudes from the tray 100 toward a direction opposite to the rotation shaft 201 and aligns with a predetermined clearance line L.sub.B as illustrated in FIG. 33. When switching the paper cassette 400 on the feeding side 11 between sideways feed and lengthways feed, interference between the paper cassettes 400 on the feeding side 11 and non-feeding side is avoided by moving the paper cassette 400 on the non-feeding side into the clearance position. As the paper cassette 400 is moved into the interchanging position or to the clearance position, the cassette rotation shaft 416 is moved to the interchanging point P.sub.O shown in FIG. 38 or to the clearance point PS shown in FIG. 33.

During .phi.-axis driving by the cassette rotating mechanism 410, the power of the pulse motor 413 is increased at the reduction gear ratio i.sub.2 and transmitted to the cassette rotation shaft 416 by the series of power-transmission gears shown in FIGS. 14 and 15. The microcomputer 20 controls the cassette rotating mechanism 410 such that the paper cassette 400 is rotated for positioning the paper for sideways or lengthways feed and that, in accordance with the rotation of the turntable 200 driven by the .theta.-axis driving, the leading edge of the paper is positioned at right angles to the feeding direction. The microcomputer 20 also controls the cassette rotating mechanism 410 such that, during the rotation of the turntable 200 driven by the 180-degree rotating mechanism 210 and during the switching of the position of the paper cassette 400 on the feeding side 11 between sideways feed and lengthways feed, the longer sides of the paper cassette 400 on the non-feeding side are positioned at right angles to the feeding center lane SL.sub.S.

By driving of the turntable 200 by the 180-degree rotating mechanism 210, .theta.-axis driving, r-axis driving and .phi.-axis driving, the paper cassettes 400 on the feeding side 11 and on the non-feeding side are interchanged and the position of the paper cassette 400 on the feeding side 11 is changed between lengthways feed and sideways feed.

Denoting the two paper cassettes 400 in the rotatable cassette unit 4 as cassette No. 1 and cassette No. 2, they fall into four modes, Modes 1 to 4, on the feeding side 11 as described below.

Mode 1--cassette No. 1 is positioned for sideways feed Mode 2--cassette No. 1 is positioned for lengthways feed Mode 3--cassette No. 2 is positioned for sideways feed Mode 4--cassette No. 2 is positioned for lengthways feed

As for switching of modes from one mode to other three modes, there are twelve switching patterns in total. However, six, a half of the twelve switching patterns, are reverse operations of the other six. Therefore, there are basically six switching patterns as shown in FIG. 23. In FIG. 23, switching operations from one mode to other modes are indicated with the solid lines, while their reverse operations are indicated with the broken lines. Besides, in each mode, the right is the feeding side 11 and the left is the non-feeding side.

A single switching pattern is constituted by a single operation or a combination of four operations 1 to 4 and their reverse operations 1 to 4 described below.

Operation 1--switching the position of the paper cassette 400 on the feeding side 11 between lengthways feed and sideways feed

Operation 2--after interchanging the paper cassettes 400 on the feeding side 11 and on the non-feeding side, positioning the paper cassette 400 on the feeding side 11 for sideways feed

Operation 3--after interchanging the paper cassettes 400 on the feeding side 11 and on the non-feeding side, positioning the paper cassette 400 on the feeding side 11 for lengthways feed

Operation 4--interchanging the paper cassettes 400 on the feeding side 11 and on the non-feeding side

FIG. 24 illustrates combinations of Operations 1 and Reverse Operations 1 to 4 constituting the respective mode switching patterns. Reverse Operations 1 to 4 are carried out by reversing the rotation of the corresponding motors.

Since the microcomputer 20 memorizes the moae switching patterns shown in FIG. 23 and their constituent operations shown in FIG. 24, after selecting a paper size to be fed from B5, B5R, A4 and A4R it executes operations constituting a mode switching pattern selected. This permits the selected paper to be placed in the feed position in accordance with the selected mode. Further, since the 180-degree rotating mechanism 210, small angle rotating mechanism 250, carriage driving mechanisms 310 and cassette rotating mechanisms 410 are controlled by combining the above-mentioned Operations 1 to 4 and Reverse Operations 1 to 4, the process of controlling each mechanism is simplified.

The following will discuss Operations 1 to 4 controlled by the microcomputer 20.

Firstly, Operation 1 of switching modes from Mode i to Mode 2 will be explained. It is assumed herein that the paper cassette 400 for B5-sized paper is located on the feeding side 11 and the paper cassette 400 for A4-sized paper is located on the non-feeding side.

In Operation 1, to shorten the operation time, the .theta.-axis driving and the .phi.-axis driving shown in FIG. 25 and the r-axis driving shown in FIG. 26 are controlled simultaneously. Similarly, the .theta.-axis driving, .phi.-axis driving and r-axis driving are simultaneously controlled in Operations 2 and 3.

As illustrated in FIG. 32, .theta. represents the displacement of the rotation shaft 201 of the turntable 200, i.e., turning angle. This is an angle between the feeding center line SL.sub.S and the center line SL.sub.L of the rotated turntable 200. The turntable center line SL.sub.L extends in the longitudinal direction of the turntable 200 while passing through the cassette rotation shafts 416 the two paper cassettes 400 and the rotation shaft 201 the turntable 200. Additionally, with regard to .theta., the displacement in the counterclockwise direction is given by a positive (+) value and the displacement in the clockwise direction is given by a negative (-) value. Each of .phi..sub.A and .phi..sub.B shown in FIG. 26 represents the turning angle of the paper cassette 400 with respect to the turntable center line SL.sub.L. Supposing that a cassette center line SL.sub.C crosses the feeding center line SL.sub.S at right angles when the paper cassette 400 is in a state Aa.sub.1 for sideways feed, the turning angle indicates the amount of movement of the cassette center line SL.sub.C when it crosses the turntable center line SL.sub.L at right angles. With regard to .phi..sub.A and .phi..sub.B, similar to the above, the displacement in the counterclockwise direction is given by a positive (+) value and the displacement in the clockwise direction is given by a negative (-) value. Each of r.sub.A and r.sub.B represents the travel distance of the cassette rotation shaft 416 from the interchanging point P.sub.O shown in FIG. 21 as the result of the movement of the carriage 300. Regarding the travel distance, the movement from the interchanging point P.sub.O toward the rotation shaft 201 is given by a negative (-) value and the movement in the opposite direction is given by a positive (+) value.

The .theta.-axis driving, r-axis driving and .phi.-axis driving are controlled simultaneously with a uniform-speed motion by maintaining the relations, r:.phi.:.theta.=2 mm:1.degree.:0.5.degree.. The ratio is set based on the reduction gear ratios i.sub.1, i.sub.2 and i.sub.4 of the .theta.-axis driving, r-axis driving and .phi.-axis driving. This is carried out by driving the pulse motors 258, 311 and 413 as power sources at a frequency, 100PPS, 7.5.degree./step in this embodiment.

In the case when Operation 1 is performed in Mode 1, by controlling the operation as shown in FIGS. 25 and 26, the position of the cassette A on the feeding side 11 storing B5-sized paper is moved as shown in FIG. 27. More specifically, as time goes by from start time a.sub.1 to time b.sub.1, c.sub.1 and d.sub.1, the position of the cassette A is changed from the sideways feed state Aa.sub.1 drawn with the solid line to a lengthways feed state Ad.sub.1 via states Ab.sub.1 and Ac.sub.1 illustrated with the alternate long and two short dashes lines. During Operation 1, the leading edge of the cassette A on the feeding side 11 is moved substantially along the predetermined cassette leading edge setting line H without causing it to protrude from the cassette leading edge setting line H. It is arranged that the cassette leading edge setting line H and the leading edge of the cassette A are in alignment when the cassette A is set in the sideways feed position or in the lengthways feed position. Moreover, denoting the cassette rotation shaft 416 of the cassette A and the cassette rotation shaft 416 of the cassette B as a cassette rotation shaft G.sub.A and a cassette rotation shaft G.sub.B, respectively, the cassette rotation shaft G.sub.A is moved to G.sub.A a.sub.1 to G.sub.A d.sub.1 in accordance with the states Aa.sub.1 to Ad.sub.1 of the cassette A.

As for a cassette B on the non-feeding side, to avoid interference between the cassettes A and B, it is moved from a sideways feed state Ba.sub.1 drawn with the solid line to a state Bd.sub.1 via states Bb.sub.1 and Bc.sub.1 illustrated with the alternate long and two short dashes lines as time goes by from start time a.sub.1 to time, b.sub.1, c.sub.1 and d.sub.1. At that time, the cassette rotation shaft G.sub.B is moved to G.sub.B a.sub.1 to G.sub.B d.sub.1 in accordance with the states Ba.sub.1 to Bd.sub.1 of the cassette B.

As illustrated in FIG. 28, when the cassette A is in the sideways feed state Aa.sub.1, the feeding center line SL.sub.S of the multi-stage feeding device 2 and the cassette rotation shaft G.sub.A are out of alignment. This is caused by aligning the feeding center line SL.sub.S with the paper center S.sub.P of the paper which is stored in the cassette A while aligning its one side against one of the sides of the cassette A. Namely, the B5-sized paper is stored in the cassette A such that its paper center S.sub.P and the cassette rotation shaft G.sub.A are in an offset state. Similarly, the paper center S.sub.P and the cassette rotation shaft G.sub.A are out of alignment when B5-sized paper is stored in the cassette A positioned for lengthways feed (see FIG. 29), when A4-sized paper is stored in the cassette A positioned for sideways feed (see FIG. 30), and when A4-sized paper is stored in the cassette A positioned for lengthways feed (see FIG. 31). In each case, the cassette rotation shaft G.sub.A is in an offset state with respect to the feeding center line SL.sub.S.

Therefore, when the cassette A on the feeding side 11 is in the sideways feed state Aa.sub.1, i.e., at start time a.sub.1, as illustrated in FIG. 32, the turntable 200 is turned by -.theta. degrees by the .theta.-axis driving so as to align the paper center S.sub.P shown in FIG. 28 with the feeding center line SL.sub.S. At this time, the cassette rotation shaft G.sub.A is also rotated by +.phi..sub.A degrees by the .phi.-axis driving as shown in FIG. 32 so that the leading edge of the paper crosses the feeding center line SL.sub.S at right angles. Then, the carriage 300, i.e., the cassette rotation shaft G.sub.A is moved by a distance of +r.sub.A by the r-axis driving in order to align the leading edge of the cassette A with the cassette leading edge setting line H. Regarding the cassette B on the non-feeding side, the cassette rotation shaft G.sub.B is rotated by an angle of +.phi..sub.B that is equal to .phi..sub.A and moved by a distance of +r.sub.B.

At time b.sub.1 the turning angle .theta. of the turntable 200 is 0.degree., i.e., the turntable 200 is in a stationary state and the turntable center line SL.sub.L is parallel with the feeding center line SL.sub.S. In this state, the rotation shaft G.sub.A is rotated with a uniform speed toward the negative direction by the .phi.-axis driving, and the cassette A is moved in the negative direction with respect to the point G.sub.A a.sub.1 by the r-axis driving without causing its leading edge to protrude from the cassette leading edge setting line H. In the meantime, with regard to the cassette B, as illustrated in FIG. 33 at time c.sub.1 the turning angle .phi..sub.B of the cassette rotation shaft G.sub.B is 0.degree., i.e., the cassette B is in a stationary state and the cassette center line SL.sub.C crosses the turntable center line SL.sub.L at right angles. In this state, the cassette rotation shaft G.sub.B is moved maximally in the positive direction from the interchanging point P.sub.O to a clearance point P.sub.S, by r.sub.B or 101 mm in this embodiment, and then stopped. Accordingly, the cassette B is stopped at the clearance position located furthest away from the rotation shaft 201. At the clearance position, an edge of the cassette B protrudes from the tray 100 to the clearance line L.sub.B and the cassette center line SL.sub.C crosses the feeding center line SL.sub.S at right angles.

As illustrated in FIG. 33, the states of the turntable 200 and the cassette B on the non-feeding side at time c.sub.1 and the states thereof at time b.sub.1 are same. At this time, with regard to the cassette A on the feeding side 11, the cassette rotation shaft G.sub.A is rotated with a uniform speed toward the negative direction by the .phi.-axis driving and moved to the retracted point P.sub.R by the r-axis driving. In this figure, the cassette rotation shaft G.sub.A is rotated by an angle of .phi..sub.A, that is, -75 degrees.

At time d.sub.1 Operation 1 is completed. As illustrated in FIG. 34, the turntable 200 is turned by +.theta. degrees by the .theta.-axis driving in order to align the paper center S.sub.P shown in FIG. 31 with the feeding center line SL.sub.S, and is then stopped. At this time, with regard to the cassette A, the cassette rotation shaft G.sub.A is rotated by -.phi..sub.A degrees by the .phi.-axis driving so that the cassette center line SL.sub.C is parallel with the feeding center line SL.sub.S and that the leading edge of the paper crosses the feeding center line SL.sub.S at right angles. Further, the cassette rotation shaft G.sub.A is moved by a distance of +r.sub.A shown in FIG. 34 by the r-axis driving in order to align leading edge of the cassette A with the cassette leading edge setting line H. In the meantime, regarding the cassette B on the non-feeding side, the cassette rotation shaft G.sub.B is rotated by an angle of -.phi..sub.B and moved by a distance of +r.sub.B that is equal to the travel distance in the state Ba.sub.1.

Operation 2 will be explained below.

As described above, after interchanging the paper cassettes 400 on the feeding side 11 and on the non-feeding side, Operation 2 positions the paper 400 on the feeding side 11 for sideways feed. This operation is controlled as shown in FIGS. 35 and 36. At start time a.sub.2, the cassettes A and B are in the states Aa.sub.2 and Ba.sub.2, i.e., they are in closest proximity as shown with the solid lines in FIG. 37. Then, as time goes by to time b.sub.2 and to time c.sub.2, they are parted from each other to reach states Ac.sub.2 and Bc.sub.2 via states Ab.sub.2 and Bb.sub.2 as shown with the alternate long and two short dashes lines. As a result, the cassette A is placed in the sideways feed position. At that time, the rotation shafts G.sub.A and G.sub.B are also moved to G.sub.A a.sub.2 to G.sub.A c.sub.2 and to G.sub.B a.sub.2 to G.sub.B c.sub.2, respectively, in accordance with the states Aa.sub.2 to Ac.sub.2 and Ba.sub.2 to Bc.sub.2 of the cassettes A and B.

When Operation 2 is started at time a.sub.2, as illustrated in FIG. 38, the turntable 200 is in a stationary state, .theta.=0.degree.. In this state, both .phi..sub.A and .phi..sub.B are 0 degrees, and the cassette center lines SL.sub.C of the cassettes A and B cross the turntable center line SL.sub.L and the feeding center line SL.sub.S at right angles respectively. In addition, both r.sub.A and r.sub.B are 0, and the cassette rotation shafts G.sub.A and G.sub.B of the cassettes A and B are located on the respective interchanging points P.sub.O.

At time b.sub.2, the turntable 200 is rotated in the negative direction by the .theta.-axis driving. At this time, the cassette center lines SL.sub.C of the cassettes A and B still cross the turntable center line SL.sub.L at right angles. In the meantime, the cassette rotation shafts G.sub.A and G.sub.B of the cassettes A and B are moved from the interchanging points P.sub.O toward the positive direction by the r-axis driving, respectively.

At time c.sub.2, Operation 2 is finished. At this time, as illustrated in FIG. 39, the turntable 200 is turned by -.theta. degrees by the .theta.-axis driving in order to align the paper center S.sub.P with the feeding center line SL.sub.S, and is then stopped. With regard to the cassette A, the cassette rotation shaft G.sub.A is rotated by +.phi..sub.A degrees by the .phi.-axis driving so that the cassette center line SL.sub.C crosses the feeding center line SL.sub.S at right angles and that the leading edge of the paper crosses the feeding center line SL.sub.S at right angles. Besides, the cassette rotation shaft G.sub.A is moved by a distance of +r.sub.A by the r-axis driving in order to align the leading edge of the cassette A with the cassette leading edge setting line H. Meanwhile, regarding the cassette B on the non-feeding side, the cassette rotation shaft G.sub.B is rotated by an angle of +.phi..sub.B that is equal to +.phi..sub.A and moved by a distance of +r.sub.B that is smaller than r.sub.A.

The following will explain Operation 3.

In Operation 3, as described above, after interchanging the paper cassettes 400 on the feeding side 11 and on the non-feeding side, the paper cassette 400 on the feeding side 11 is positioned for lengthways feed. The operation is controlled as shown in FIGS. 40 and 41. Namely, as illustrated in FIG. 42, the cassettes A and B are in the states Aa.sub.3 and Ba.sub.3 at start time a.sub.3, i.e., in closest proximity as shown with the solid lines. Then, as time goes by to time b.sub.3, c.sub.3 and d.sub.3, they are moved so that the cassette A is positioned for lengthways feed and cassette B is in a state Bd.sub.3, i.e., a longer side of the cassette B is perpendicular to the longer sides of the cassette A. At that time, the rotation shafts G.sub.A and G.sub.B of the cassettes A and B are also moved to G.sub.A a.sub.3 to G.sub.A d.sub.3 and to G.sub.B a.sub.3 to G.sub.B d.sub.3, respectively.

As illustrated in FIG. 43, at time a.sub.3 when Operation 3 is started, the states of the turntable 200 and the cassettes A and B are as same as those at time a.sub.2 in Operation 2 shown in FIG. 38.

At time b.sub.3, the turntable 200 is still in the stationary state. At this time, with regard to the cassette A, the cassette rotation shaft G.sub.A is rotated at a uniform speed toward the negative direction by the .phi.-axis driving, and is moved from the interchanging point P.sub.O to the retracted point P.sub.R by a distance of -r.sub.A so that the leading edge of the cassette A will not protrude from the cassette leading edge setting line H during rotation. Regarding the cassette B, as illustrated in FIG. 44, at time c.sub.3 the turning angle .phi..sub.B of the cassette rotation shaft G.sub.B is 0.degree., i.e., it is in a stationary state where its cassette center line SL.sub.C crosses the turntable center line SL.sub.L at right angles and the cassette rotation shaft G.sub.B is stopped at the clearance point P.sub.S. The states of the cassette B at time c.sub.3 shown in FIG. 44 and time d.sub.3 shown in FIG. 45 are the same as those at time c.sub.1 and time d.sub.1 in Operation 1 shown in FIGS. 33 and 34.

The explanations of Operations 1 to 3 described above show the controlled variable for the case where the cassette A stores B5-sized paper. So when the cassette A stores paper of a different size, the control variable will vary.

As illustrated in FIG. 46, Operation 4 interchanges the paper cassettes 400 on the feeding side and on the non-feeding side by rotating the turntable 200 by 180 degrees. The two paper cassettes 400 are placed side by side in closest proximity to the rotation shaft 201 of the turntable 200, and then the turntable 200 is turned. At this time, the cassette rotation shafts 416 are located on the respective interchanging points P.sub.O. Differently from other operations, Operation 4 is performed independently of the .theta.-axis driving, .phi.-axis driving and r-axis driving.

As described above, the rotatable cassette units 4 and 5 of this embodiment includes first rotation driving means for rotating the turntable 200 as carrying member. The first rotation driving means is constituted by the 180-degree rotating mechanism (rotation driving means for interchange) for rotating the turntable 200 by 180 degrees (the first angle of rotation) so as to interchange the paper cassette 400 on the feeding side 11 and the paper cassette 400 on the non-feeding side, and the small angle rotating mechanism 250 (rotation driving means for adjustment) for rotating the turntable 200 by an angle (the second angle of rotation) smaller than the first angle of rotation so as to align the paper center line S.sub.P of the paper stored in the paper cassette 400 on the feeding side 11 with the feeding center line SL.sub.S.

With this configuration, even when paper in the paper cassette 400 is replaced with paper of a different size, for example, B5, B5R, A4 or A4R, the respective rotatable cassette units 4 and 5 are capable of feeding the paper properly. Thus, the rotatable cassette units 4 and 5 as feeding apparatuses of the present invention can handle paper of various sizes.

Additionally, the 180-degree rotating mechanism 210 and the small angle rotating mechanism 250 are installed at a corner and the opposite corner on the tray 100 which are located outside of the turning space E.sub.L of the turntable 200 and on the non-feeding side opposite to the feeding side 11.

This allows the height of the apparatus to be decreased, and thereby achieving a smaller apparatus. More specifically, if the 180-degree rotating mechanism 210 and the small angle rotating mechanism 250 are installed within the turning space of the turntable 200, they need to be installed in positions away from the turntable 200 and the paper cassettes 400 along a vertical direction of the turntable 200 so as to prevent interference between these mechanisms 210 and 250 and the turntable 200 and paper cassettes 400. Such a configuration causes an increase in the height of the apparatus, and thereby resulting in a larger apparatus.

On the contrary, in this embodiment, since the 180-degree rotating mechanism 210 and the small angle rotating mechanism 250 are installed in the positions on the tray 100 outside of the turning space of the turntable 200, space is used more effectively. Consequently, it is possible to reduce the height of the apparatus considerably. In terms of height, moreover, since the total height of the turntable 200 and paper cassette 400 is available for the installation of the 180-degree rotating mechanism 210 and small angle rotating mechanism 250, they can be installed easily.

Besides, for instance, if one of the two paper cassettes 400 is used only for lengthways feed and the other is used only for sideways feed, it is possible to eliminate a mechanism for rotating the paper cassette 400 between lengthways feed and sideways feed. In this case, the cassette rotating mechanism 410 is used for just correcting the angle of the paper cassette 400. In other words, the cassette rotating mechanism 410 rotates the paper cassette 400 to position the leading edge of the paper at right angles to the feeding direction when the turntable 200 is rotated to align the paper center S.sub.P with the feeding center line SL.sub.S.

Further, in this embodiment, the turntable 200 is rotated by the 180-degree rotating mechanism 210 and the small angle rotating mechanism 250. However, for example, it is possible to integrate the two rotating mechanisms 210 and 250 into a single rotating mechanism, and to control the integrated mechanism in the same manner as that the 180-degree rotating mechanism 210 and small angle rotating mechanism 250 are controlled.

Furthermore, in the case when the movement of the paper cassettes 400 driven by the carriage driving mechanisms 310 is unnecessary, the carriage driving mechanisms 310 may be excluded.

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Claims

1. A feeding apparatus comprising:

carrying member installed rotatably on a base member;

a plurality of storing means installed rotatably on said carrying member, for storing paper on which an image on a document is to be copied and for feeding the paper from a predetermined feed position;

first rotation driving means installed in a position on said base member outside of the turning space of said carrying member, for rotating said carrying member;

second rotation driving means for rotating said storing means on said carrying member;

first controller means which controls said first rotation driving means to interchange said storing means on a feeding side and said storing means on a non-feeding side with each other;

second controller means which controls said first rotation driving means to align a paper center line of the paper stored in said storing means on the feeding side with a feeding center line;

third controller means which controls said second rotation driving means to position the paper in said storing means on the feeding side at right angles to a feeding direction;

wherein said first rotation driving means includes:

driving means for producing a driving force for rotation said carrying member;

transmitting means for transmitting the driving force of said driving means to said carrying member;

wherein said driving means is a motor, and

wherein said transmitting means includes:

a series of gears for transmitting a rotation of said motor;

a pulley which rotates as said series of gears rotate; and

a connecting belt attached around said pulley and a rotation shaft of said carrying member.

2. A feeding apparatus comprising:

carrying member installed rotatably on a base member;

a plurality of storing means installed rotatably on said carrying member, for storing paper on which an image on a document is to be copied and for feeding the paper from a predetermined feed position;

first rotation driving means installed in a position on said base member outside of the turning space of said carrying member, for rotating said carrying member;

second rotation driving means for rotating said storing means on said carrying member;

first controller means which controls said first rotation driving means to interchange said storing means on a feeding side and said storing means on a non-feeding side with each other;

second controller means which controls said first rotation driving means to align a paper center line of the paper stored in said storing means on the feeding side with a feeding center line;

third controller means which controls said second rotation driving means to position the paper in said storing means on the feeding side at right angles to a feeding direction; and

wherein said first rotation driving means includes:

rotation driving means for interchanging said storage means which rotates said carrying member by a first angle of rotation to interchange said storing means on the feeding side and said storing means on the non-feeding side with each other; and

rotation driving means for adjusting said storage means which rotates said carrying member by a second angle of rotation to align the paper center line of the paper in said storing means on the feeding side with the feeding center line, the second angle of rotation being smaller than the first angle of rotation.

3. The feeding apparatus according to claim 2,

wherein said base member is quadrangular in shape, and said rotation driving means for interchanging and said rotation driving means for adjusting are disposed at different corners of said base member.

4. The feeding apparatus according to claim 2,

wherein each of said rotation driving means interchanging and said rotation driving means for adjusting includes:

driving means for producing a driving force for rotating said carrying member; and

transmitting means for transmitting the driving force of said driving means to said carrying member.

5. The feeding apparatus according to claim 4,

wherein said driving means is a motor, and

wherein said transmitting means includes:

a series of gears for transmitting a rotation of said motor;

a pulley which rotates as said series of gears rotate; and

a connecting belt attached around said pulley and the rotation shaft of said carrying member.

6. The feeding apparatus according to claim 5,

wherein a double pulley and the rotation shaft of said carrying member are integrally formed, and said connecting belts of said rotation driving means for interchanging and said rotation driving means for adjusting are attached around the upper and lower stages of said doubly pulley, respectively.

7. The feeding apparatus according to claim 4,

wherein each of said transmitting means of said rotation driving means for interchanging and said rotation driving means for adjusting includes a clutch section for transmitting the driving force of said driving means and for cutting off the transmission of the driving force, ana

wherein said first controller means and said second controller means control said clutch sections to transmit the driving force and cut off the transmission of the driving force alternately.

8. The feeding apparatus according to claim 4,

wherein said transmitting means of said rotation driving means for interchanging has a reduction gear ratio which is smaller than that of said rotation driving means for adjusting.