Abstract: A liquid injection recording apparatus includes a head having orifices provided to discharge liquid and form flying droplets, and energy generating members for generating energy utilized to form the droplets. Electrical contacts for inputting an electrical signal to the energy generating members are provided on a surface different from a surface in which the orifices are provided. The liquid injection recording apparatus has such liquid injection recording head mounted on a mounting portion on which is provided electrical contacts adapted to be connected to the electrical contacts of the recording head when the recording head is mounted on the mounting portion.

Abstract: A liquid ejection recording apparatus has a substrate section and a support member. The substrate section has orifices for discharging ink droplets, resistors for generating thermal energy upon application of a voltage, and connector pins. The support member has an ink supply pipe and connector sockets for receiving the connector pins of the substrate section when the substrate section is mounted and supported on the support member. Ink can be supplied from an ink tank or a replaceable ink pack in the support member or can be supplied from a separate location through a pipe. Electrical signals for recording can also be supplied to the substrate section from a remote location through a flexible cable. The substrate section can be easily removed from the support member for replacement.

Abstract: An alterable storage unit is included in a control apparatus to store code conversion tables for transforming type data or type position data into various control data such as a hammer pressure, an amount of ribbon feed and an amount of proportional space. When a type element is replaced with another, code conversion tables concerned with the new type element are stored in the storage unit. This permits the code conversion tables to be altered or renewed concentratedly in the event of type element replacement.

Abstract: In a system including a cassette containing a print wheel arranged to cooperate with holding devices provided in an impact printer having a rotatable setting shaft to which the print wheel can be releasably fastened for rotation therewith, the cassette is formed to enclose the print wheel on all sides except the region where it is to be acted upon by a printing hammer. The printer can be provided with a detent mechanism cooperating with counterdetent elements in the cassette to hold the cassette in a fully inserted position in the printer. The cassette can additionally be provided with an outwardly curved collecting funnel positioned for catching dirt released in the region where the type faces of the printing wheel strike a printing medium.

Abstract: A printer is provided with carriage having a daisy print wheel supporting type elements at the external circumferential edges of respective spokes that make up the wheel. The printer sequentially performs a printing operation by causing its carriage to move in the direction of a printing row and a hammer to strike the designated type element held by an associated print wheel spoke after rotating the designated type element into the printing position. The daisy print wheel includes a number of spokes each mounting a type element at its external circumferential edge. At least one of these spokes is provided with a pen at the position corresponding to that of the type element held by the remaining spokes, and as a result, by selecting the pen from the type element supported in the remaining spokes, either a picture, diagram, or a graph can be optionally drawn, thus effectively realizing a multifunctional printer.

Abstract: This invention relates to a device for mounting a printing type array on a printer. The mounting device comprises a pin supported on the casing of a printing type array for moving into and out of a hole in the printing type array under and against resilient force, respectively, a pressure member secured to the machine framework for urging the pin into the hole in the printing type array, a motor movably supported on a carriage and having a rotary shaft including a flange and a latch pin normally subjected to resilient force to protrude from one face of the flange and retract from the one face of the flange against resilient force and resilient retainer means on the motor rotary shaft and printing type array for preventing the printing type array from moving in the axial direction of the shaft as the motor moves to the operative position and for allowing the printing type array to rotate together with the shaft as the shaft rotates.

Abstract: A character-carrying disc for a printing machine has a central hole surmounted by a circular portion which is situated out of the plane of a body of the disc and supported at a distance from the body of the disc by two diametrically opposed pillars. This circular portion is provided with two diametrically opposed ears enabling the disc to be gripped. The circular portion of the disc is provided with two small tongues which are elastically deformable and are directed axially, with free ends of the tongues being movable in two openings provided in the body of the disc. The small tongues are adapted to press resiliently on the shaft of the printing machine on which the disc is mounted for the purpose of retaining the disc in place on this shaft.

Abstract: A printing apparatus having a platen for supporting a sheet of paper, comprising: a carriage movable along the length of the platen, and including an upward protrusion having a top surface which includes a first slant part inclined downwardly in a direction toward the platen; a print head including a mounting portion resting on the upward protrusion, the mounting portion having a bottom surface which includes a second slant part in abutting contact with the first slant part; and a fixing device for clamping the mounting portion of the print head to the upward projection of the carriage substantially in a direction of height of the upward protrusion. An angle of inclination of the first and second slant parts being selected such that a clamping action of the fixing device produces a component force sufficient to force a portion of the print head against a side surface of the protrusion on its side opposite to the side facing the platen.

Abstract: In a printer adapted to receive any of a plurality of petal-type printing thimbles, each of the printing thimbles is provided with a recognition code-forming portion containing a plurality of protuberance-forming positions, the arrangement of protuberances at the protuberance-forming positions defining a thimble recognition code which identifies specific character position, hammer impression, and character spacing tables. These tables identify the character positions, hammer impression forces and character spacings required to print characters designated by character codes when the recognition code identified printing thimble is mounted on the printer. A mechanical means, mounted on the printing hammer cover of the printer carrier unit, detects the presence or absence of protuberances at the protuberance-forming positions of the code forming portion on the printing thimble, to generate a binary recognition code received by the printer processor.

Abstract: The disc, made of plastic material, is provided with a circular collar coaxial with its central hole and which is provided, diametrically opposed, with two arms bent at 90.degree., each arm terminating with a small tongue the end of which extends beyond the said central hole. These small tongues are intended to engage an annular groove provided in the shaft of the machine at the vicinity of its end. The radial displacements of the small tongues are effected during the deformations of the arms which, due to their elasticity, return the small tongues into position.

Abstract: A print wheel cartridge for a serial printer. The cartridge includes a spring designed to lock the print wheel in the cartridge. The spring automatically releases the print wheel when the cartridge is inserted into the printer.

Abstract: A locking assembly is disclosed for mounting a print wheel of the daisy type to a rotary drive mechanism. The locking assembly is constructed of a print wheel stop rotatable with the shaft of the drive mechanism, a print wheel retainer slidable along the shaft between a print wheel connecting and attaching position and biasing means for biasing the print wheel retainer into the connecting and attaching positions. The print wheel is provided with attaching members for engaging a portion of the print wheel retainer while being supported by the print wheel stop for detachably connecting the print wheel thereto and for permitting detachment of the print wheel therefrom when the print wheel retainer is arranged by the biasing means into the detaching position. Further in accordance with the present invention there is provided a carriage assembly adapted for tilting the print wheel to facilitate replacement and/or removal thereof wherein the carriage assembly is provided with a bias plate.

Abstract: A cassette containing a printing head removably installed in an ink jet printing machine. The cassette includes a housing which encloses the printing head in a protective manner when the cassette is removed from the machine and when the cassette is installed in the machine and the printing head is in an inoperative position. The head and housing are provided with locking elememts for securing the head in the housing when the cassette is to be removed.The machine includes a carriage for moving the printing head past a record carrier during printing operations, locking elements for locking the printing head onto the carriage when the cassette is installed in the machine, a receptacle for holding the housing in the machine, and a mechanism for releasing the locking elements when the printing head is in the inoperative position to permit removal of the cassette from the machine.

Abstract: A character-carrying disc made of plastic material is provided, on its front face, with four protrusions each provided with a circular-arc shaped blade, coaxial with a central mounting hole of the disc. Each blade is itself provided with a projection protruding radially inwardly of the central hole of the disc. These rolls are adapted to engage, by resilient deformation of the blades, in an annular groove provided in the end of a shaft of the machine on which the disc is mounted.

Abstract: Apparatus to support an inked ribbon cartridge and/or daisywheel motor and assembly. The cartridge has a paper shield integral therewith that is notched to expose the ribbon to the paper, whereby a daisywheel petal carrying a type font may be struck by a print hammer to type a character. The cartridge has a detent to lock the daisywheel motor support in a fixed position. The motor support may be adjusted in position relative to the platen.

Abstract: A printing apparatus having a simple construction is constituted by a print element with a plurality of resilient spokes which have type elements disposed vertically thereon and in two rows around the element and extend upwardly from a disc base in a cylinder, and a gear on the disc base integral therewith and coaxial with the disc base and cylinder. The print element is easy to mount and remove. A hammer for pressing each type element on the print element against a printing member and a shaft mechanism for carrying out a shifting operation of the print element are provided. A rotary means includes a motor for rotatably driving the print element and a drive gear connected to the motor. A holder is provided for holding the print element, hammer, and shift mechanism. The print element is preferable mountable and removable with respect to the holder and when mounted, engages the drive gear and is rotatable and vertically movable.

Abstract: A print wheel mounting means. The print wheel has pivot posts formed integrally thereon. The pivot posts are spring-locked into channels in a connector attached to the print wheel drive shaft. The connector thus positions the print wheel to be pivoted onto the print wheel drive shaft.

Abstract: An electronic mail terminal 10 that includes a keyboard 12, multi-character display 14, thermal printer 22, tape drive 118, and communication and control circuitry. The tape drive and printer mount to molded-in features of a base housing 20. A printed circuit board 28 containing the communication and control circuitry and the display is mounted to molded-in features of the base housing. The keyboard plugs into the printed circuit board from above and is supported at the sides by stand-offs in the base housing. A cover housing 88 mates with molded-in features of the base housing. The tape drive mechanism includes cassette guides 98 and 376 that are molded into the base and cover housings and a spring loaded motor mount that automatically compensates for wear and positioning tolerances. A printer carriage motor 184 drives a toothed belt 182 to position a carriage 138 which holds a thermal print head 140.

Abstract: An apparatus for mounting a daisy wheel on a shaft driven by a motor in a daisy wheel printer comprises a driving head carried by the driven shaft at its free end, while the daisy wheel is provided with a coupling member. This coupling member is adapted to be coupled in a rotation fixed manner with and to be removed from the driving head by moving the daisy wheel in a substantial radial direction. A locking means is movable between a release position in which the daisy wheel is movable in a substantial radial direction with respect to the driving head and a working position in which the daisy wheel is locked on the driving head.A daisy wheel to be used in a printer with such an apparatus, comprises a central portion and a number of radially extending spokes carrying at their ends a letter, figure or a similar character. Two ribs are formed in V-shape on the one side of the daisy wheel.

Abstract: A radially displaceable coupling between a printing disc and the drive shaft of a printing machine. A bracket having a planar surface is secured to the drive shaft, the bracket having a planar face. Clamps are provided on one of the disc and bracket faces for engagement with the other of said disc and face. A resilient arm, including a zig-zag configured portion terminating in a blade having an inclined lateral surface, is formed on one of the disc and bracket and a recess is provided in the other of the disc and bracket for receiving the resilient arm to effect securement therein in a wedgelike engagement. A lateral surface borders the recess and coacts with the lateral blade surface. The lateral surfaces are convergent relatively coacting when the arm is engaged within the recess to prevent angular movement of the disc and to cause the disc to bear against the drive shaft at a location diametrically opposite to the location of the recess.

Abstract: A print head carriage assembly is provided which is especially suitable for use in a thermal dot matrix character printer. The assembly includes a belt, which in one embodiment is formed of laminations of film. The belt is formed into a loop with a free end by a tensioning device; the belt loop tautly passes around a pair of guides, one of which is bidirectionally rotatable to transport a print head clipped to the loop between the two guides and across a platen. The control signals to the print head are passed via conductors affixed to the belt from the free end of the belt to the print head.

Abstract: An impact printing mechanism which contains a great number of printing types in a minimized spacing is disclosed. Types are arranged in rows of columns on a plurality of substantially planar type carrying elements which are accommodated in equally spaced parallel relationship in a removable casing. Selection of a type is attained by three dimensional movements including horizontal movements of the elements within and perpendicular to their planes and a vertical movement of an element within its plane.The type carrying elements are carried on a carrier while a print hammer is mounted on an independent carrier. The former carrier includes an outer section and an inner section mounted for movement on the outer section, and means for lifting a type carrying element is mounted on the outer section.

Abstract: A trolley of a printer includes a pair of angularly upright projecting dovetail-like fingers spaced apart near a left edge thereof, and a spring biased wedge pin located near a right edge thereof, for slideably engaging chamfer-like surfaces on the left and right-hand sides of a printhead assembly, respectively, for permitting the assembly to be snapped into and out of retention upon the trolley, the trolley further including right and left hand leaf springs located near its rear edge for pushing the printhead assembly forward toward the front edge of the trolley to a forwardmost position determined by one of the pair of dovetail-like fingers striking a "stop" located upon one side of the printhead assembly for preventing further forward movement, whereas the printhead assembly is pushed rearward upon the trolley in the event of a paper jam developing between the printhead and a platen.

Abstract: A hairpin type spring is mounted on the body of a print wheel disc provided with an upstanding post of generally cylindrical configuration and having an overhang and a pair of second posts spaced longitudinally from the first post. The second posts are each being provided with laterally opening facing recesses defined as ninety degree sectors, each having perpendicular lateral walls. The spring includes a bend and a pair of branch arms. The spring is mounted with its bend bearing on the post beneath the overhang and its arms within the recesses in the second posts bearing laterally against the recess walls with the free ends bearing axially against said recess walls. The first post and the upstanding second posts are formed unitary with the disc.

Abstract: A marking machine having a printing wheel with printing characters on the periphery of the wheel. Adjustment means are provided for adjusting the rotational position of the wheel with respect to a drive shaft comprising a drive train connecting the printing wheel to the drive shaft. The printing wheel is rotatable with respect to the drive shaft but may be fixed by an intermediate backing plate member which is keyed to the drive shaft. An adjustable eccentric rotatably connected to the printing wheel has an eccentric shaft element fitting in a slot in the backing member to provide rotable adjustment of the printing wheel with respect to the drive shaft. The printing wheel may be slipped on and off the shaft and is secured to the drive shaft by a hub-like handle member having a spring radially biased ball detent receivable within a groove on the end of the drive shaft to facilitate ready connection and removal of the printing wheel.

Abstract: Apparatus for mounting a print head on a movable carriage which moves the print head across a record medium supported by a platen. The apparatus includes a projection extending from the front portion of the carriage, an opening in the print head arranged to accommodate the projection aligning the print head with respect to the platen, a compression spring maintaining the projection in the opening and a movable camming surface in contact with the projection for positioning the print head a variable distance away from the platen.

Abstract: Printing apparatus for electric office machines a print unit having a motor (14) and a disk-shaped type element (17) connectable with the motor shaft (16). The print unit is pivotably mounted for movement between a printing position, in which the type element is fixed for movement with the motor shaft, and an upwardly pivoted position in which the type element is disengaged from the motor shaft to allow replacement. A locking system permits upward pivoting of the print unit only when the type element has assumed a predetermined angle. The locking system comprises a lock collar (23) rigidly connected to the motor shaft (16) and having an end wall in which there are at least two axially directed recesses (24), or alternatively having at least two axially directed pins, the recesses or pins coacting with complementary parts (39) arranged on a disengagement systems (33, 34, 36, 37), axially displaceable during the pivoting movement.

Abstract: An impact printer of the type wherein a print wheel is rotated to a print position by a motor, and printing is caused by impacting a particular character on the print wheel by a print hammer. The present impact printer has the print wheel drive means and the print hammer mechanism located on opposite faces of the print wheel, which greatly facilitates removal and insertion of print wheels in the printer.

Abstract: A print wheel comprising a plurality of character elements for use in a serial impact printer such as a typewriter is directly attached to a rotor of a high performance rotary stepper motor. The rotor which is characterized by a high force-to-mass ratio includes a plurality of circumferentially spaced magnetic drive elements which are integrally formed with the rotor hub which also supports the print wheel. In one embodiment, the stator of the rotary motor forms an axial air gap between an active stator portion and an inactive stator portion, and the rotor and print wheel are removably mounted in the air gap. In another embodiment, the stator of the rotary motor forms a radial air gap between the active stator portion and the inactive stator portion.

Abstract: Apparatus for releasably attaching a daisy print wheel to a splined shaft of an angular drive such that the print wheel can be driven in angular rotation with substantially no backlash. The apparatus comprises a splined hub fixed to the print wheel and slidably engageable with the splined shaft and a holder mounted on the hub for movement between a locking position in which the hub is locked on the splined shaft with interference fit and a released position in which the hub with the holder thereon is slidably removable from the splined shaft together with the print wheel. The hub includes a plurality of angular segments of cantilever formation which are pressed into the spaces between the splines on the drive shaft with interference fit by the engagement of the holder in its locking position. The holder is axially movable on the hub in traveling between the locking and release positions and is not normally removable from the hub.

Abstract: A printing apparatus having a daisy-shaped type wheel which is equipped with a multiplicity of radially disposed type element holders each carrying at its outer end a type element. A printing head comprising the type wheel, an electric drive motor coupled to the type wheel, a print hammer and a ribbon cartridge, is pivoted, with a simple manipulation of a manual lever, from its lower, normal operating position to its upper non-operating, about 45.degree.-from-horizontal position at which the type wheel is mountable on, or removable from, the end of a rotor shaft of the motor in an axial direction thereof, without interference with a platen, and with the ribbon which is put out of the mounting and removing path of the type wheel when a platform on which the cartridge is mounted is pivoted to its upper position together with, and by larger amount than, the printing head due to the manipulation of the manual lever.

Abstract: A text processing device, for example a typewriter, comprising a first guide for text receiving sheet material, a carrier slidable along a second guide for a disc being rotatable about an axis and having flexible, radial symbol arms and a hammer mechanism mounted fixedly on the carrier opposite the first guide touching each symbol arm, wherein the disc has a central orifice for receiving a pin journalled in the carrier and being displaceable with the aid of a mechanism from a retracted position to a projecting operational position and conversely, in which projecting position the pin snaps into said orifice, whereas the disc is equipped with a registering member disposed near said central orifice and co-operating with a driving element setting the angular position of the disc, said driving element being journalled coaxially with the pin in the carrier.

Abstract: The invention relates to a fastening mechanism (10) for removably securing together two workpieces, such as the mounting plate (50) of a print head housing (16) and the support blocks 12 of a carriage (10) in a line printer. The fastening mechanism has a locking member (22) having a stud portion (24) mounted on the carriage (10) for rotational and axial movement relative thereto and having abutment surfaces (28) cooperating with cam surfaces (56, 62) on the print head housing (16) upon rotation of the locking member (22) so as to latch together the print head housing (16) and carriage (10) by the action of a spring (38) biasing the locking member in an axial direction. The fastening mechanism enables a simple and rapid removal and mounting of the print head housing (16) to the carriage (10) without the use of any tools.

Abstract: Printing apparatus in which the print head and ribbon cartridge assembly of the printing apparatus provides for tilting movement of the print head and ribbon cartridge into an inoperative position tilted away from the platen, with the ribbon cartridge in an extended tilted position for removal and replacement of the rotary disk print wheel, free from interference from either the platen or the ribbon cartridge without removing the ribbon cartridge.

Abstract: An integrally formed molded print wheel of the daisy wheel type for mounting on an arbor assembly of a printer includes a generally cylindrical hub and a generally annular support disc at one end of the hub and of larger dimension. A multiplicity of webs connect the hub to the support disc, and a multiplicity of flexible character arms extend radially from the support disc with each arm having an indicium adjacent its outer end for printing. A multiplicity of rib elements are integrally formed in the central passage of the hub and have a tapered portion to detachably secure the print wheel on the arbor of the printer.

Abstract: The printing and correcting device is applied to a daisywheel printer and comprises a frame supporting a cartridge for a typing ribbon and a correcting ribbon arranged below the typing ribbon. The frame is able to swing as the result of operation of an electromagnet, from a rest position providing visibility of the print, to an intermediate position for printing the characters. A second electromagnet raises the frame through a greater length of travel in order to position the correcting ribbon in front of the printing point. A rotating electromagnet causes automatic unidirectional advance of the typing ribbon after each character has been printed. The correcting ribbon is wound between two spools and its motion is provided by means of a pawl which engages with a gear wheel for driving the spool only in the case where the path of travel of the frame is greater than that which relates to positioning of the typing ribbon.

Abstract: The print head of a serial printer includes a protruding plug which is seated and locked into a receptacle on a translating carriage. An endless belt has teeth engaged in a correspondingly contoured groove of the carriage for positive connection between carriage and belt, whereby the head traverses the printing medium for printing thereon. The platen is positively and simply held and includes a resin surface for impact of print wires. The gap between the head and platen is readily adjusted in steps by motion of a lever.

Abstract: An impact printing apparatus automatically discriminates the kind of a type element mounted on a reciprocating carriage of the printer and interchangeable with another type element. A print control program is selected in conformity to the specific kind of type element while desired printing is carried out according to the selected program. Each of the interchangeable type elements is provided with a mark or marks or coded data to be detected by a sensor which is located in a predetermined position on a stationary part of the printer. The mark or coded data is sensed while the type element is rotated or while the carriage carrying the type element is moved. A single mark in the form of a slit is formed in a rotary hub of the type element, and the sensor for detecting the mark comprises a light emitting element mounted on the carriage and a light receiving element mounted on the stationary part of the printer which corresponds to the light emitting element.

Abstract: The present invention relates to a serial printer comprising the mechanism for selecting one type by moving the mounted printing wheel and the carrier for moving said mechanism on the print sheet, has the object that the printing can be done at the maximum speed which is the optimum for the print wheel even in case any kind of printing wheel is mounted and is characterized in that the carrier shifting speed can be changed in accordance with the inertia of printing wheel and a shifting distance of printing wheel.

Abstract: A novel rotary printing device, such as a daisy-type printwheel, for use in an impact printer, having identifying means thereon. In one form, plural protrusions, extending axially outwardly from the printing device, are provided and the angle between the protrusions serves the dual function of identifying the print element characteristics and identifying the reference position of the printing device for "arming" the printer with the information. In another form, a single protrusion is provided solely for identifying the reference position. A method and apparatus for in situ identification of the novel rotary printing device also forms a part of the instant invention.

Abstract: A type band for a steel band printer containing a track of sensible timing marks is provided with two additional sensible marks each located between two timing marks. The printer counts the number of sensible timing marks occurring between the two additional marks to identify the character set on the type band.

Abstract: A printing apparatus for serial printing by displacement of a printing head, in which a discriminating circuit identifies the typefont of the printing head mounted on the carriage, and a coincidence circuit compares the result of typefont identification with the typefont to be printed and provides alarm if the two are different.

Abstract: A daisy wheel print element includes a hub unit which can be fixedly assembled on the shaft of a drive motor and a flat disc element which is assembled with the hub unit in an arrangement which allows the disc element to be inserted on and removed from the hub unit normal to the axis of the shaft of the drive motor. Very little space is required to insert or remove the disc element, which includes opposing guide members that are slidably received on opposite edges of a guide plate of the hub unit and a key or index lug which registers in a notch in the guide plate, as the projecting cylindrical nipple at the center of the disc element nests in the semi-circular cup of the hub unit.

Abstract: A printer having a mechanism for easy loading of a type wheel rotatably supported by a type wheel cartridge. The type wheel cartridge can be inserted into or withdrawn from a cartridge holder by moving the type wheel cartridge in a direction perpendicular to the axis of the type wheel supported by the type wheel cartridge. Coupling of a shaft of a type selection motor to the type wheel within the type wheel cartridge can be effected by relatively moving the cartridge holder and the type selection motor axially of the type wheel.

Abstract: A print hammer release mechanism for use in typewriters or similar machines in which means are provided for moving the print hammer from a first position in which the print hammer is in position for a printing operation to occur, to a second position which facilitates the insertion of a print element into the typewriter.

Abstract: A print element mounting apparatus for attaching and removing a print disc to and from a selector shaft in a printing machine. The apparatus comprises a finger-grip cap which is fixed on the print disc and a coupling device carried by the print disc. The coupling device includes a generally circular shaped unitary flex member made from yieldable half-sections which are continually urged towards one another by a spring wrapped about the flex member. Each half-section includes a pair of pressure surfaces which are curved in complementary relation to form a biased opening at the central portion of the flex member. The selector shaft is fabricated to include tapered surfaces that operate in conjunction with the pressure surfaces to afford snap-action operation during interchange of the print disc accomplished through a push or a pull force axially applied to the cap.

Abstract: A serial printer comprises a carriage 32 movable parallel to a platen 14 and on which there is mounted a printing device 31, for example of the daisy wheel type. The guides 23, 25 on which the carriage slide are mounted on a frame 20 which can turn with respect to the fixed sides of the machine on pivots 16, 17 to allow easy replacement of the daisy wheel. A motor 70 located beneath the roller constituting the platen effects displacement of the carriage along the writing line by means of a steel cable 72 and a series of return pulleys 44, 45, 75, 82. The cable passes through coaxial holes 74, 84 in the pivots of the frame, in such a way that its conditions are not altered when the frame is turned. A unidirectional clutch 86 and a spring 89 coupled to one end 88 of the cable maintain the tension in the cable always constant, while providing a non-yielding anchorage when the motor pulls on that end of the cable.

Abstract: A printer employing a daisy-type wheel. On a hub of the type wheel a pin is slidably disposed and is backwardly biased by a spring to protrude from the rear surface of the hub. In a central opening of the hub a hair pin spring having a pair of arms is disposed. The type wheel is mounted on a drive shaft of a motor through a coupling element. The coupling element is provided with a projection which is fitted into the opening of the hub and engaged with the arms of the hair pin spring by a snap action to latch the type wheel to the drive shaft in the axial direction. In the axially latched state the pin protrudes from the front surface of the hub, resisting the resilient force of the spring, by the coupling element.

Abstract: A typewriter (not illustrated) using a daisy wheel as the type carrying member and having a unit which drives the daisy wheel element to rotate about its axis and a device for coupling the daisy wheel element onto the drive unit.The coupling device substantially comprises a pin which engages a hole in the daisy wheel element; first resilient means carried by the unit and operable to transmit to the daisy wheel element an axial thrust in a first direction; second resilient means operable to transmit to the daisy wheel element an axial thrust in a direction opposite the thrust generated by the first mentioned means; and manual control means which act on the said second resilient means in such a way as to compensate, if actuated, the thrust generated by such second resilient means.

Abstract: In the combination of an office machine for writing data and a source of a set of printing types including a carrier carrying such printing type set and a cassette in which the carrier is housed and which is insertable in the machine and exchangeable for other cassettes housing carriers carrying respectively different type sets, the office machine being provided with a receiving unit for receiving at least a portion of such cassette and holding such portion in an inserted position in the machine, there are provided control elements carried by the portion of the cassette and receiving members located in the region of the receiving unit to cooperate with the control elements of a cassette portion in the inserted position for initiating at least one of the operations of setting the machine to the particular printing type carried by the carrier and identified by the control elements, and supplying operating power to the machine.