Abstract: An ink ribbon cassette which is adapted to be demountably loaded on a recording apparatus having a recording head capable of recording information on a recording medium supported by a platen, the ink ribbon cassette has the following parts: a substantially box-shaped casing constituted by an upper case and a lower case which are connected to each other at their vertical walls, the casing having a first side wall facing the platen and a second side wall opposing the first side wall, a recessed portion formed in one end of the first side wall and capable of receiving the recording head, engaging portion provided on the second side wall and adapted for engagement with retaining member on the recording apparatus, a pair of through holes constituted by pairs of apertures formed in the portions of the upper and lower cases adjacent to the first side wall, the through holes being adapted for receiving locating members on the recording apparatus so as to locate the ink ribbon cassette, and a path of an ink ribbon ext

Abstract: A printer comprises a type wheel, a print hammer and a guide member each disposed in parallel with a platen. The type wheel and print hammer are both disposed on a carriage body which is laterally reciprocated along a guide shaft. A holder member, on which a print ribbon and a correction ribbon are mounted, is disposed on the carriage body in such a manner as to be switchably turned between an erasing position, where the rear end thereof is lifted up by a predetermined height, and a print position where it is not lifted up. Correction ribbon taking-up mechanisms disposed in the holder member and the carriage body feed the correction ribbon stepwise to switch the position of the holder member. Furthermore, a swing limiter mechanism is provided for restraining the holder member from being lifted up beyond the erasing position.

Abstract: A daisy-wheel type printer having a position shifting mechanism for selectively positioning a ribbon cassette and an erase ribbon at a given place in front of a platen, a print hammer driving mechanism, a print ribbon takeup mechanism and an erase ribbon takeup mechanism. These mechanisms are driven by a single drive motor through a plurality of cams mounted on a drive shaft of the drive motor. The drive motor is carried on a carriage body laterally movable along the platen. The carriage body also carries a holder member on which the ribbon cassette and the erase ribbon are mounted. The holder member is pivotally supported to a support shaft and has a printing pivot position and an erase pivot position. The plurality of cams includes a lifter cam, a print cam and a ribbon supply cam. The lifter cam includes a plurality of cam portions.

Abstract: A printing apparatus has a driving motor being rotatable in the forward and backward directions, a first gear for receiving the torque of the motor, a swaying arm secured to an end of the first gear, a printing unit including a plurality of ribbon cassettes superposed on one another, and convey mechanism for conveying document or passbook to the printing unit. The printing unit comprises a taking-up gear for independently taking-up ink ribbons contained in ribbon cassettes, a cam mechanism for selectively shifting the ink ribbons to allow one to pass a printing head, and a second gear for transmitting the torque of the motor from the first gear to the taking-up gear or to the cam mechanism in accordance with sway of the swaying arm.

Abstract: A typewriter or similar machine with a ribbon and, if required, a correction tape on a pivotable support which can be lifted or lowered, the ribbon or the correction tape being movable in steps. The pivoting of the ribbon is necessary in order to give a view of the typed text. Since it is selectively possible to type or to correct, it is necessary to lift the support for the ribbon or the correction tape to different levels, so that the particular ribbon required is opposite the line to be printed. The transport of the ribbons as well as the lifting of the support is performed by means of a reciprocation-rotation motor. The respective rotational movement of the reciprocation-rotation motor is preferably transferred to one of the ribbons by toothed wheels. The ribbon can be moved on far enough so that a fresh ribbon surface is available. The same can be done for the correction tape.

Abstract: There is provided a mechanism for correcting the printing position of an electronic typewriter comprising a working pin attached to a ribbon bracket, the working pin cooperating with a ribbon cam so as to move the ribbon bracket to a printing or correction position, a coil spring for resiliently supporting the working pin, a printing track groove and correction track groove formed in one side of the ribbon cam and connected to each other, a correction angle formed between the starting points of the printing and correction grooves, and two slopes respectively formed in the starting points of the grooves. The lower ends of a push pawl and pawl locker are connected to carriage body respectively by means of a push pawl coil spring and pawl locker coil spring. A push cam is rotated by the turning force of a motor transmitted via an idle gear and following gear, and the pawl locker contacts the push pawl locker of the push pawl.

Abstract: A printing mechanism for printing on a recording medium includes a cam mechanism for moving an ink ribbon to an effecting position to act on the recording medium and an initial position for not acting on the recording medium. The cam mechanism includes a cam plate and a cam tracing pin guided in a cam groove within the cam plate, with the cam tracing pin traveling several courses in the cam groove. A driving device imparts rotary motion to the cam mechanism in two directions about a rotary axis and the cam tracing pin is guided in several stages of rotary motion.

Abstract: A recording apparatus for recording onto a recording medium and capable of correcting an erroneous recording includes an ink sheet mounting section on which an ink sheet for effecting the recording medium is mountable, a device for effecting the ink sheet to the recording medium, and a motor for driving the ink sheet. By a driving force produced by one directional rotation of the motor, the recording ink sheet is moved between an effecting position where the recording ink sheet is effected by the effecting device and a retracted position where the recording ink sheet retracts from the effecting position. Also, by a driving force produced by the motor, the correcting ink sheet is moved between an effecting position wherein the correcting ink sheet is effected by the effecting device and a retracted position where the correcting ink sheet retracts from the effecting position.

Abstract: A ribbon lift-up apparatus for selectively rotating a ribbon cartridge holder to the printing position or the correcting position uses a disc cam provided with various cam grooves for the printing operation and correcting operation, respectively. The disc cam includes a circular first cam groove for continuous printing operation. The first cam groove has a specified radius with the rotation axis of the disc cam as a center thereof. A second cam groove for single type printing operation is provided and a cam follower pin is positioned initially at a home position in this second cam groove. The second cam groove is in communication with the first cam groove. A third cam groove for a correcting operation is also provided. The follower pin will initially be at the home position of the second cam groove and will cross the first cam groove during the correcting operation. The third cam groove has a smaller radius than the specified radius of the first cam groove.

Abstract: There is provided an ink ribbon cassette detachably mounted on a carriage of a recording apparatus, housing an ink ribbon supplied from a casing and taken up therein after passing through a recording section and including first positioning means for positioning the ink ribbon cassette in a first direction when the ink ribbon cassette is mounted on the carriage, and second positioning means for positioning the ink ribbon cassette in a second direction when the ink ribbon cassette is mounted on the carriage, wherein at least one of the first and second positioning means is elastically engaged with positioning means of the carriage, and inclined portions are formed at ink ribbon exit and entrance portions in the widthwise direction of the ink ribbon. A tension spring is included to prevent slackening of the ink ribbon in the cassette.

Abstract: A printer having a printing head provided with a plurality of printing elements disposed substantially along a line, a cylinder supporting a print sheet such as a sheet of paper held by an edge clamp and an ink ribbon changer. Four ink ribbons, for example, are contained each in a cartridge removably attached to a support and indexing mechanism. The support and indexing mechanism of ink ribbons and providing an accurate multi-color printing.

Abstract: Function controlled raising and transporting mechanism for the selective control of a print ribbon or correction tape by means of a power drive and freewheeling clutches operative to effect print ribbon or correction tape transport incident to carriage motion in print direction only. In certain commanded functions such as spacing, tabulating, etc., both the print ribbon and correction tape transports are disabled by moving output elements of the freewheeling clutches to intermediate clutch disabled positions to thereby realize optimum utilization of the ribbon and tape capacities.

Abstract: A printer in which a daisy wheel on a carriage is caused, by a hammer actuating mechanism, to impact against a printing sheet fed by a sheet feed mechanism, so that the sheet is printed with use of a ribbon interposed between the sheet and the wheel. The hammer actuating mechanism, a printing ribbon feed mechanism, a correction ribbon feed mechanism, and a correction ribbon lift mechanism constituting a first driven section, and the sheet feed mechanism constituting a second driven section, are connected to a single DC motor by means of clutch means. In driving the first driven section, the motor is supplied with a predetermined supply voltage from an external power source. In driving the second driven section, the motor is supplied with a supply voltage chopped by chopping means so that the second driven section is driven with a smaller driving force and at a lower rotating speed than the first driven section is.

Abstract: A single solenoid is connected to a ribbon feed mechanism which is selectively operable either to feed a print ribbon or to lift and feed an error correction tape. A print hammer solenoid is operable to condition the ribbon feed mechanism either for feeding the print ribbon or lifting and feeding the error correction tape. To feed the print ribbon, an electronic circuit energizes the print hammer solenoid before energizing the ribbon feed solenoid in response to depressing a character key. To lift and feed the error correction tape, the electronic circuit energizes the print hammer solenoid after energizing the ribbon feed solenoid in response to depressing a correction key.

Abstract: A ribbon lifting mechanism usable for a typewriter including a holder turnably supported in a frame, a motor driven ribbon lifting cam and at least a cam follower operatively connected to the holder. Printing ribbon and correction tape are accommodated in the holder and either of them is located at the printing position by means of the ribbon lifting cam which is formed with a plurality of cam sections. The cam follower is actuated in accordance with cam sections on the ribbon lifting cam. The mechanism further includes a stopper member which serves to locate the printing ribbon at the printing position while it is engaged to the holder. The stopper member also serves to locate the correction tape at the printing position while it is disengaged from the holder.

Abstract: An apparatus for supplying a newly re-coated continuous ribbon to a moving printhead carrier in a printer. The present invention is particularly adaptable for use in thermal printers having multicolored ribbons. The apparatus comprises a cartridge housing which is mounted on the printer frame, and which contains the ribbons. The newly re-coated ribbons exit the cartridge housing, become coupled to the moving printhead carrier, and then reenter the cartridge housing as used ribbon. The used ribbon passes a re-coating station where it is re-inked through contact with a donor ribbon and heated pressure rollers to become newly re-coated ribbon. A lift arm on the printhead carrier selects the desired colored ribbon which has been newly re-coated for printing.

Abstract: An ink ribbon cassette is constructed such that it is unnecessary to wind off an ink ribbon at the start of every line printing process. The cassette includes two pairs of reels, each pair including an ink ribbon-winding off reel and an ink ribbon-winding up reel. The pairs of rails are rotatably mounted one above the other on a cassette casing which is detachably mounted on a carriage of a printer. The casing is provided with a driving shaft which is rotated in normal and reverse directions in response to reciprocal movement of the carriage. The driving shaft being provided with two one-way clutches transmitting the rotation of the shaft in opposite directions. Conveying members separately convey the ink ribbons for the respective pairs of reels and are driven by respective to the one-way clutches.

Abstract: The multicolor thermal printer comprises a frame (1), a platen (4) and a carriage (2) that can move along the platen (4). This carriage (2) consists of a lower part (5) carrying the thermal print head (3) and an upper part (6) hinged to the part (5) thanks to a hinge pin (7a). The upper part (6) carries four inking ribbons (31) located on levels of height increasing from the front to the rear so that the inking ribbons are arranged in a vertically offset fashion on the ribbon guides (40). By pivoting of the upper part (5), the ribbons can be placed successively opposite the heating elements (3a). A drive mechanism (53 to 68) for the ribbons is made so as to drive only the ribbon placed opposite the heating elements (3a) and only when the carriage (2) is moved in the direction of printing.By this design, a fast change of the printing color and a reduced consumption of inking ribbons can be attained.

Abstract: A cartridge for a typing ribbon and spools for a correcting ribbon are mounted on a common frame which can tilt about a spindle. In a lowered position of the frame the typing line behind a daisy wheel is visible. The frame is raised by a first stroke to the position shown to dispose the typing ribbon over the typing point on the platen. A longer stroke raises the correcting ribbon to the typing point and this longer stroke also actuates an automatic ratchet wheel and pawl type of feed mechanism for the correcting ribbon. The two strokes of the frame are controlled by a disc comprising two cam tracks with a common part and separate parts having different degrees of eccentricity relative to the common part.

Abstract: A lifting and lowering mechanism for an ink ribbon and a correction tape of a typewriter includes a stepper motor which drives both a ribbon lift arm and a tape lift arm. First and second gear wheels, partially geared at predetermined portions and pivoted along the stepper motor shaft, engage with a gear wheel equipped at the ribbon lift arm and the tape lift arm respectively. The ink ribbon and the correction tape are lifted separately and selectively by changing the direction of the stepper motor rotation.

Abstract: A drive system to raise and transport both print and correction ribbons on typewriters or like machines is powered by a single bidirectional stepping motor. In one direction of rotation the motor acts via a special action clutch to first drive mechanisms for raising a print ribbon and then to establish gear connections for driving mechanisms for transporting the print ribbon. In the other direction, the motor acts to establish gear connections for driving mechanisms for raising and transporting a correction ribbon.

Abstract: A single stepping motor 10 driven to effect ribbon feed, ribbon lift, correction tape feed, correction tape lift is disclosed. The stepping motor 10 controls a cam 60/follower 64 pair to effect lift through a connection link 54 to a depending coupling 56 on the ribbon cartridge 22. The link 54 provides accurate positioning of the ribbon cartridge 22 without regard to the cam position and further transmits ribbon feed motion through to the depending coupling to the ribbon driver 30. Correction tape feed is effected through link 54 controlling the oscillation of the cartridges 22, 24 relative to a tape feed cam member 44.

Abstract: The typing and erasing device is applied to a printer of the daisywheel type and comprises a carrier (84, 86) for a typing ribbon (32) having a plurality of transverse tracks which can be selected for the printing operation and a carrier for an erasing ribbon which is disposed parallel to but at a different height from the typing ribbon. The typing ribbon is contained in a cartridge on which two typing ribbon carrier arms (41) are pivoted. The carriers oscillate vertically in order to render visible the typed characters and for the operations of typing or erasing the characters at the typing point (12).

Abstract: Mechanism to raise and transport print and correction ribbons in typewriters and similar machines as a function of the direction of a rotation of a motor. The required motions are brought about by means of a cam wheel containing different cams and by appropriate cam followers, and provision is made to maintain ribbon raised to the typed line level so that during rapid printing only transport steps need to be carried out. It is also possible with the mechanism to effect transport steps of different size, to meet the requirements of the ribbon type used.

Abstract: In an electronic correcting typewriter, a character correction and replacement system is disclosed for facilitating the task of correcting typed character errors. The typewriter includes a printing and a correcting mechanism operated under electronic control and a correction buffer is associated with the electronic control for storing the last plurality of printed characters. To automatically erase any previously printed character which character has its code stored in the correction buffer and print a new replacement character, the typist locates the carrier opposite the unwanted character and actuates the character key of the desired replacement character. Under control of the electronics, the unwanted character code is recalled from the correction buffer, the correcting mechanism is operated to erase that character and the printing mechanism is operated to print the new character. Operator setting of an overstrike flag provides character overprint capability.

Abstract: A ribbon lift device for selectively positioning a print ribbon and a correction ribbon to a print position for printing or correction of a character includes a first cam having a cam groove formed therein for lifting the print ribbon to the print position and a second cam having a cam profile for lifting the correction ribbon to the print position. Means are provided for coupling the first and second cams such that forward rotation of the first cam will not rotate the second cam but reverse rotation of the first cam will rotate the second cam in the same direction, and a bidirectional electric motor is coupled to the first cam whereby rotation of the motor will lift the print ribbon or the correction ribbon, depending upon the direction of rotation.

Abstract: A printer for use with a data processor and a ribbon cartridge for use in the same are disclosed. The cartridge has at least two separate ribbon supplies which may differ in the type of ink on the ribbon (MICR vs. ordinary) and/or in color of ink or otherwise. A mechanism moves the cartridge along a straight line path to index selectively an active portion of each of the ribbons to a position aligned between a printhead and a platen for printing through the selected ribbon. A ribbon drive mechanism drives at least one of the ribbon supplies only when that ribbon supply has been selectively indexed to be printed through. In one embodiment a Magnetic Ink Character Recognition ribbon supply is driven between take-up and supply reels only when it is indexed for printing, while a multi-strike ribbon with ordinary ink is driven continuously. In another embodiment only one of two or more ribbon supplies is driven at one time.

Abstract: A ribbon driving mechanism for a typewriter, having a cam member provided on one side thereof with a first cam section for effecting control of a printing ribbon, and a second cam section extending continuously from the first cam section for effecting control of a correction tape, and a stopping member for controlling the movement of a cam follower along the cam sections. Either the printing ribbon or the correction tape is moved selectively to the printing position and only the rotation of a motor for driving the cam member in one particular direction, is transmitted to a printing ribbon winding mechanism, to wind the printing ribbon.

Abstract: An erasing ribbon is guided by the same vibrator as the typing ribbon behind the lower part of the typing ribbon. An erasing key acts on the back-spacing mechanism of the typewriter and on an element which suppresses the carriage escapement during a correction cycle initiated by any one of the typing keys. The necessary settings are made by a slide which stores the erasing key command. In particular, the slide acts on a lever which varies the stroke of the ribbon vibrator for selecting the erasing ribbon, also on a device which causes the erasing ribbon to advance and on a mechanism which inhibits the escapement during the execution of the correction cycle. The setting slide is then returned to rest by the first typing key operated after the erasing cycle. A correction selection lever acts on the lever which varies the stroke of the ribbon vibrator and selects permanently the erasing ribbon independently of the erasing key for a forward erasing of the characters of one or more words.

Abstract: Apparatus for lifting print and correction ribbons in typewriters or printers having a bidirectional motor for driving a lift lever coupled to lift, according to the direction of rotation, either the print or correction ribbon, as required. In order to be able to use a relatively weak motor, the lifting movements of the lift lever driven directly by the motor are transmitted directly to the print or correction ribbon guides without interconnecting members. Print ribbon feed is implemented by means of camming surfaces on the lift lever operating to feed ribbon during the return movement of the print ribbon to rest position below the printing line.

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: Mechanisms are disclosed for modifying conventional single element and typebar typewriters, having character-for-character correction systems, with automatic backspacing or non-backspacing, and non-forward spacing, after obliteration, to provide an additional operational mode whereby character-for-character correction can be achieved with automatic forward spacing, after each obliteration, thereby to provide simplified word obliteration.

Abstract: A cartridge for a typing ribbon and spools for a correcting ribbon are mounted on a common frame which can tilt about a spindle. In a lowered position of the frame the typing line behind a daisy wheel is visible. The frame is raised by a first stroke to the position shown to dispose the typing ribbon over the typing point on the platen. A longer stroke raises the correcting ribbon to the typing point and this longer stroke also actuates an automatic ratchet wheel and pawl type of feed mechanism for the correcting ribbon. The two strokes of the frame are controlled by a disc comprising two cam tracks with a common part and separate parts having different degrees of eccentricity relative to the common part.

Abstract: A typewriter with a ribbon cartridge of the type having a frame which supports first and second ribbons on different planes, and having a mechanism which controls the positioning of the cartridge with respect to a typing member and which includes at least one drive shaft carrying cams for rotation therewith; an element for supporting the frame of the cartridge; rocker levers controlled by the cams and operable to control the displacement of the frame via the support element; and two positioning elements each of which is operable to maintain a respective lever in two distinct working positions.

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: A ribbon drive clutch comprises a stepper motor which has an output shaft on which there is mounted a clutch plate and a pair of cams. A plurality of pawls are each pivotally mounted on the clutch plate and are disposed to engage the first cam for rotation with the output shaft responsive to rotation of the output shaft in a first direction and disposed to engage the second cam for rotation with the output shaft responsive to rotation of the output shaft in a second direction. A first cam follower is disposed for operation of a ribbon drive linkage to drive a first ribbon responsive to rotation of the first cam and a second cam follower is disposed for operation of a ribbon drive linkage to drive a second ribbon responsive to rotation of the second cam.

Abstract: An error correcting typewriter having separate elevating and feed mechanism for carbon and error correction ribbons includes a common cyclic motive source operable in response to type commands to drive a cam shaft which is axially shiftable by means of an electromagnet energized by a correction signal. Normally, the cam shaft is positioned in engagement with a carbon ribbon drive lever and out of engagement with an error correction ribbon drive lever. A shift of the cam shaft disengages it from the carbon ribbon drive lever and engages it with the error correction ribbon drive lever. The carbon ribbon drive lever simultaneously operates a carbon ribbon elevating mechanism and a feed mechanism. Energization of the electromagnet operates a lever which directly operates the correction ribbon feed mechanism and simultaneously shifts the cam shaft to engage it with the error correction ribbon drive lever which when driven is operative on the correction ribbon elevating mechanism.

Abstract: In a daisy wheel or rotary print wheel typewriter, a single motor (stepper motor) is employed to accomplish both ribbon lift and feed for typewriter ribbon and correction ribbon loaded in a cartridge assembly. A single motor drive moves a cartridge assembly support about an axis to present either the typewriter ribbon or the correction ribbon to the print point at the print line. In the first portion of the arc that the cartridge assembly moves, normal typing on the typewriter ribbon occurs, only the feed ratchet for the typewriter ribbon being engaged. Alternately, when the rotation is greater, to present a correction ribbon at the print line, the added elevation of the cartridge assembly causes disengagement of the normal ratchet feed for the typewriter ribbon but allows advancement of the correction ribbon.

Abstract: An inked and error correction ribbon assembly comprising an inked ribbon cassette adapted to be pivotally mounted in a machine and an error correction ribbon holder having support arms which embrace the inked ribbon cassette and pivotally support the error correction ribbon holder about the pivot of the inked ribbon cassette. The ribbon cassette and the inked ribbon holder each have forwardly extending spaced ribbon guides, with the guides of the error ribbon holder located outwardly of the guides of the inked ribbon cartridge to provide areas in which error correction ribbon spools can be located forwardly of the inked ribbon cassette and between the inked ribbon and error correction ribbon guides. The assembly allows the location of both the error correction and ink ribbon spools in substantially the same horizontal plane and allows movement of the inked ribbon cassette independently of the error ribbon holder.

Abstract: Disclosed is an assembly for threading a ribbon, preferably an erase ribbon through an impact printer such as a typewriter. One end of the ribbon is stored at a ribbon storage means, while the other end of the ribbon has a tab fastened thereto. The longitudinal dimension of the tab is perpendicular to the longitudinal dimension of the ribbon and the tab contains a frangible portion which is used for finger engagement during the threading operation. The ribbon take-up reel contains a slot in one of the flanges thereof such that the ribbon tab may be inserted into the slot after the ribbon has been threaded through the printer. The frangible portion is then separated from the ribbon and discarded.

Abstract: An assembly for elevating the print ribbon and the erase ribbon of an impact printer is disclosed. In their respective rest positions, the ribbons are positioned in vertical relationship to one another and in one embodiment the ribbons are in the same plane when in their rest positions. When the printer is operating in the print mode, the print ribbon is selectively elevated to the print point while the erase ribbon remains stationary. When the printer is operating in the erase mode, both ribbons are elevated. In the erase mode, the print ribbon is elevated to a point above the print point and the erase ribbon is elevated to the print point.

Abstract: An inked ribbon changeover mechanism for a printing machine, in which a plurality of inked ribbons are looped over a plurality of guide members, respectively. The guide members are carried on a movable member, which is arranged to be movable to first and second positions relative to a printing head such that a selected one of the inked ribbons is placed in an operative position in which a portion of the selected one of the inked ribbons is located in a space between the printing head and a record medium when the printing head is in a printing position.

Abstract: A device for facilitating location of the printing point and/or the correction of characters comprises a mechanism actuated by a back space key to shift the printing point back. A second mechanism, also actuated by the back space key, moves a pointer to a set position over the printing point simultaneously with the back spacing. A restoring element controlled by a typing mechanism automatically restores the pointer to an inoperative position clear of the printing point before the typing of the selected character. A correcting key, when actuated, sets a suppressor which arrests the movement of a spring actuated actuator to lock the escapement and prearranges a lift mechanism for raising a correcting ribbon into an operative position. A positioner connected to the lift mechanism holds the suppressor in the set position in opposition to the action of a returning spring when the mechanism is prearranged for use and releases the suppressor when the correcting ribbon is raised into the operative position.