Abstract: An automatic monitor sliding system comprises a machine case, a slidable structure, a monitor mounting plate, and a monitor structure. The slidable structure is mounted inside a reception chamber of the machine case. The monitor mounting plate is mounted in front of the machine case. The monitor structure is mounted in front of the monitor mounting plate. As a result, the slidable structure slides the monitor structure forward to slant the monitor structure downward for facilitating the user to insert and retrieve the audio-visual disk. Consequently, the automatic monitor sliding system provides the functions of protecting machine, preventing dust, water permeation, and mistouch input, and providing high sliding radian.

Abstract: There is disclosed an endless flexible printing band and method of making such printing bands. A wide endless band having columns and rows of raised printing characters is molded onto a sheet having columns and rows of visually readable characters corresponding to the printing characters. Following molding, the wide band is slit into a plurality of printing bands.

Abstract: A character wheel, particularly for a numbering machine, comprises a character wheel disc having a plurality of printing portion mounting surfaces formed at an interval from each other in a circumferential direction on an outer peripheral surface of the character wheel disc and an engaging groove formed to at least one of portions between the respective printing portion mounting surfaces and a flexible character wheel band mounted to the outer peripheral surface of the character wheel disc. The character wheel band is formed with engaging projections formed at both longitudinal ends thereof and the engaging projections are engaged with the engaging groove formed to the character wheel disc so that the flexible character wheel band is mounted to the character wheel disc therearound.

Abstract: There is disclosed an endless flexible printing band and method of making such printing bands. A wide endless band having columns and rows of raised printing characters is molded onto a sheet having columns and rows of visually readable characters corresponding to the printing characters. Following molding, the wide band is slit into a plurality of printing bands.

Abstract: There is disclosed a printing band and method of making same. The printing band has printing characters and human readable characters. The human readable characters and the portion of the band adjacent thereto are coated with a first coating while masking off the printing characters. Thereafter, the outer surfaces of the human readable character are coated with a second coating which is darker than the first coating. The human readable characters are easy to read and are not easily degraded during use.

Abstract: A printing head structure of calculator, including a belt type printing head the outer periphery of which is disposed with at least one group of fine characters and at least one group of coarse characters. The fine characters have the same symbols and numerals as the coarse ones, while having different thicknesses and letterforms. By means of a printing control program of the calculator, the printing head is able to print out a positive or negative result respectively by fine characters or coarse characters so as to apparently visually distinguish the positive result from the negative one and thus achieve a reliably reminding effect.

Abstract: A method and apparatus for controlling a serial printer of the invention selects a first digit character by counting a predetermined number of timing pulses that starts to be generated during carriage return and sets the predetermined number so as to correspond to the character to be printed and the number of digits printed in a last line. The apparatus may include a time measuring device, and selects a first digit character to be printed in succession to a last line by measuring a predetermined carriage return time and sets the predetermined carriage return time so as to correspond to the character to be printed and the number of digits printed in the last line. The apparatus also may include a timing pulse interval detector, and a first digit character is selected after the selection of a character group by counting a predetermined number of timing pulses and the predetermined number is set so as to correspond to the character to be printed and the number of digits printed in the last line.

Abstract: A small printer is disclosed which contains a character member, such as a character ring or a character belt. The character member comprises a plurality of character bodies which are connected by coupling portions and which comprise dot-like projections which form dot characters. The small printer also has a device to rotate the character member in order to place a desired dot character body which contains the dot character to be printed between a hammer and a piece of paper. Subsequently, the hammer strikes the desired character body and the dot character is printed on the paper. Since the small printer has the above-described construction, the small printer is less expensive and smaller than conventional printers.

Abstract: An object of the present invention is to provide a print control method capable of increasing a printing speed by preventing the drop of the printing speed in line feed without increasing an economical burden.Disclosed is a print control method of carrying out printing by detecting a reference position signal SP for detecting an initial position of an endless ring-shaped type belt 13 having a multiplicity of types 15 and a type position signal CP of each of the types 15 as well as carrying out a type position count CC corresponding to each of the types 15, the method comprising the step of detecting the reference position signal SP each time the type belt 13 rotates once as well as detecting the reference position signal SP after the completion of printing of one line only if it is a final line to be printed.

Abstract: An impact printing device for printing postal bar code patterns on an information carrier. The patterns are a combination of parallel tall and short bars separated by spaces. The type elements are attached to a movable type carrier, each element comprised of pairs of vertical bars having different stroke lengths but equal widths. Additionally these elements contain overscored and/or underscored horizontal bars, that when printed appear outside the postal bar code clear space. This produces print elements that have nearly equal area and in turn produce printed characters of uniform stroke widths that are easily read by the U.S. Postal Service electronic readers.

Abstract: A method and apparatus for controlling the adjustment of printer hammers which impact against an associated moveable member on which characters are present. Each hammer includes a coil which is energized at the appropriate time, taking into consideration the "flight time" of the associated hammer. These flight times are determined by detecting a change in the back EMF in the energizing current to the coil. These flight times are averaged to obtain a running average of the last several successive flight times (for each hammer in the printer), and successive timing pulses from a timing disc are used to obtain an almost instantaneous velocity of the moveable member (like a printer drum) just prior to a character to be printed. The last several successive flight times are stored in a non-volatile RAM of a controller to enable the printer to be ready at a next start up.

Abstract: An impact printer has a print band moving longitudinally around pulleys with one side of the band moving in contact along a rigid platen and the other side having engraved characters presented along a print line of a print medium (e.g. paper and ink ribbon). The leading edge of platen is squared off (e.g. sharp) to scrape contamination off the band. A row of hammers impact the print medium against the band between the hammers and an impact surface of the platen. The impact surface of the platen contains multiple longitudinal grooves which start slightly back from the leading edge of the platen and which prevent increased friction force between the band and platen from occurring as the band wears the platen impact surface smooth.

Abstract: An interposer device for use in an impact printer for printing at condensed pitches includes an interposer plate and a striker strip attached thereto. The interposer plate is a thin spring steel plate slotted to have a plurality of chevron flexure elements symmetrically disposed across the plate. The striker strip is a thin strip of elastomeric material which is similarly slotted to have a plurality of chevron wear prevention flexure elements. Tabs on the edges of the striker strip and pockets on the surface of the interposer plate which receive the tabs provide for removably attaching the strip to the plate whereby the chevron wear flexure elements of the strip overlay the chevron flexure elements of the plate for joint deflection by impact.

Abstract: An interposer device for an impact band line printer comprises a spring steel interposer plate member with plural chevron flexure elements etched therein so that the apexes thereof are arranged in a row across the plate. A polymer striker strip has a series of cutouts configured in a herringbone pattern and forms a longitudinal spine section with support ribs connecting the spine section to the margins of the strip. Two sided pressure adhesive tapes attached along the margins of the strip are bonded to the surface of the interposer plate with the spine section aligned with but unattached with the apexes of the chevron elements. A laminated interposer strip assembly comprises a polymer striker strip layer with adhesive attachment layers on one side along the margins and a backing layer removably attached to the other side of the striker strip layer.

Abstract: A platen for a line printer has a polymer wear resistant strip on a base support. To reduce frictional drag on the band which is in sliding engagement with the wear strip, the leading edge of the strip is slanted against the direction of motion of the band and is provided with grooves that run perpendicular with the leading edge.

Abstract: A miniature printer is provided which can print characters in additional different character sets of fonts by combining several character sets which are included in the printer on a type drum or type belt. The printer includes a mechanism for selecting particular character sets and impacting a selected character from a selected character set on a printing medium. After a character is printed, the user may select a character from another character set which is present on the drum or belt and overprints the first character. This combination of character sets allows the printer to produce characters which distinguishable fonts without utilizing different color inks.

Abstract: A system and method for automatically compensating for inaccuracies in the positioning of the timing mark sensor of a band line printer. A selected hammer is operated to impact a test character and an adjacent space between characters or a space provided by a blank character on the type band. The flight times of the hammer for the character and space impacts are measured under control of a microprocessor programmed to locate the edge of the test character and to compute a timing adjustment value for use by the printer control to obtain centered impacts of characters during printing.

Abstract: A microprinter for use in combination with such compact equipments as electronic calculator. The microprinter comprises a type belt driven through a belt pulley by a motor, a type selecting ratchet wheel combined with the belt pulley for rotation together with the latter, a hammer for pressing a selected type of the type belt to print the type on a recording sheet, a main printing gear driven by the motor, a selector lever capable of selectively engaging the type selecting ratchet wheel or the main printing gear, an armature plate associated with the selector lever, an electromagnetic clutch for driving the armature plate, and a sheet feed lever interlocked through the armature plate with the electromagnetic clutch.

Abstract: A printer for printing on a print medium. A type carrier is in the form of an endless belt having a plurality of type elements on a side face. A hammer mechanism urges the type elements in the print medium into contact. The hammer mechanism extends substantially parallel to a portion of the type carrier and includes a hammer member for each printable position of the printer. A print drum mechanism selectively drives the hammer mechanism. The print drum mechanism includes the print drum with a plurality of projections around the peripheral surface of the print drum. There are a like number of projections and hammer members. Each of the projections is adapted to drive a separate hammer member and rotation of the print drum results in the driving of the hammer members by the projections. A control mechanism coupled to the type carrier and the print drum mechanism selectively advances the endless belt relative to the hammer mechanism and rotates the print drum.

Abstract: High speed impact line printers comprise a continuously moving type carrier, such as an endless belt or band having engraved type characters movable at constant speed parallel to a row of print hammers. A print medium such as a continuous paper web and an ink ribbon are located between the hammers and the type carrier. The hammers are uniformly spaced parallel with the type carrier to define a print line. The spacing of the hammers corresponds to the desired spacing of the printed characters when printed and generally has one print hammer for each print position. An interposer member located between the print hammers and the print paper web enables certain characters such as vertical or horizontal bars of bar code type can be printed in the region of the clearance gaps between hammers.

Abstract: A printer for printing on a print medium. A type carrier is in the form of an endless belt having a plurality of type elements on a side face. A hammer mechanism urges the type elements in the print medium into contact. The hammer mechanism extends substantially parallel to a portion of the type carrier and includes a hammer member for each printable position of the printer. A print drum mechanism selectively drives the hammer mechanism. The print drum mechanism includes the print drum with a plurality of projections around the peripheral surface of the print drum. There are a like number of projections and hammer members. Each of the projections is adapted to drive a separate hammer member and rotation of the print drum results in the driving of the hammer members by the projections. A control mechanism coupled to the type carrier and the print drum mechanism selectively advances the endless belt relative to the hammer mechanism and rotates the print drum.

Abstract: A pulley for connecting a driven device, that is sensitive to speed variations, to be driven by an a.c. motor that is susceptible to speed variations, caused by power line disturbances. The pulley has a peripheral drive surface for a belt drive and two side surfaces through which an opening is formed to receive a drive shaft that is turned by the a.c. motor. One of the sides of the pulley has a slot formed therein with surfaces on each side of the slot. A resilient material of a preselected Durometer value is positioned within the slot and contiguous with at least one of the surfaces in the slot, against which an element projecting from the drive shaft acts to turn the pulley. During a momentary slowdown in the motor speed, the projecting element moves away from the resilient material and permits the momentum of the driven device to maintain its speed while the motor recovers its speed.

Abstract: A type carrier set (10) for a stamp printing mechanism is described which comprises a plurality of type carriers (12) which carry print types (22) at their outer surface in consecutive fields (16). The type carriers (12) are disposed parallel adjacent each other in the order necessary for use in the stamp printing mechanism. The adjacently disposed type carriers (12) are connected together by connecting webs (28) adapted to be sheared off. In the method according to the invention for assembly the stamp printing mechanism using a type carrier set according to the invention in which the type carriers are endless bands, the type bands connected together are separated from each other consecutively in each case on turning for the first time of the setting shaft by shearing off the connecting webs (28).

Abstract: A printer control apparatus provides a control circuit arrangement which enables flight timing to be performed during printing. Basically, the invention achieves this by providing flight time control means activated by a print hammer operation signal. Preferably the control temporarily inhibits the continuation of print hammer operation. Preferably the control inhibits print hammer operation subsequent to a selected print hammer by inhibiting the comparisons of print line and type element data contained in storage devices of the print control. Inhibiting may be for a fixed interval based on an average of the flight times of all the hammers. Alternatively the inhibiting interval may be varied according to the individual flight times of the hammers. In order to avoid slowing the print speed excessively, only one hammer is timed during printing of one line.

Abstract: A printer having a platen, a type belt having a plurality of types arranged oppositely to the platen and projected at an interval on a belt body thereof, a carriage for placing a hammer member for pressing the desired type of the type belt movably arranged on the back of the type belt on the platen, and a mask member supported to the carriage and disposed between the platen and the type belt characterized by said mask member having a slope for disposing the type side used for printing in the vicinity of the platen, thereby preventing inks from mixing and preferably printing a desired type by a small pressing force.

Abstract: A platen assembly for an impact printer comprises the combination of an impact transducer between the backup plate and the type band of a printer and an impact isolator interposed between the transducer and the type band. The transducer comprises a strip of force sensitive material. The strip extends over a plurality of print positions. Electrode means in contact with the surfaces of the force sensitive material form discrete impact zones aligned with the print hammers. One of the electrode means is a continuous conductive strip on one side of the force sensitive strip. Plural conductive pads on the other side of the strip form the discrete impact zones. The continuous conductive strip is preferably on the side facing the type band and serves as the ground connection. The impact isolation means comprises plural force elements between the type band and the transducer element and preferably is part of a comb which can be conductive and provides stiffening to the force sensitive strip.

Abstract: A printer comprising a printing drive gear for generating a print operation output and having a print control cam for controlling a print operation; a paper feed control cam adapted to be rotated with the printing drive gear as a unit for controlling a paper feed operation; a paper feed driving intermittent gear for generating a paper feeding output; a ratchet wheel for controlling an output timing of the paper feed driving intermittent gear; a print control lever adapted to be moved in association with the print control cam and be releasably engaged therewith; a paper feed control lever adapted to be moved in association with the paper feed control cam; a pawl lever adapted to be moved integrally with the paper feed control lever and be releasably engaged with the ratchet wheel; and an electromagnetic clutch capable of generating a first rotative output for driving the print control lever and a second rotative output for driving the paper feed control lever and the pawl lever, wherein the paper feed control

Abstract: Method for controlling line printers comprising a revolving type band (400) and a print hammer bank for precalculating the firing times of the print hammers.The type band generally comprises equidistantly spaced scannable time marks (402) and a reference mark (501).The character spacing on the type band is subject to a coarse raster pitch .DELTA.T which is derived from the time mark pitch.The time mark positions are associated with coarse raster positions.The arrangement of the print hammers is subject to a coarse raster pitch .DELTA.T and a fine raster pitch .DELTA.T. Coarse and fine raster values are defined as time values.The hammers are sorted according to the fine raster values and their firing times are calculated by means of a special algorithm according to the order resulting from the sort step.

Abstract: A printer for printing both standard pitch and condensed pitch characters which includes print hammer faces which have a single wide section for standard pitch characters and a double wide section for printing condensed pitch characters. Using this hammer face one obtains the advantage of high speed when printing standard pitch characters and yet one is able to print condensed pitch characters with the same printer.The face of each hammer is divided into two sections. The first section of each hammer face is identical to the hammer face in a conventional single width hammer. The second section of each hammer face spans the width of two condensed pitch characters.The hammers are divided into two groups. The first group of hammers has the single width section on the top of the hammer face and the second group of hammers has the single width section on the bottom of the hammer face.

Abstract: A printer comprises a plurality of type belts each having a variety of types thereon, turning means for driving the type belts, coloring means for applying inks of different colors to the type belts, hammer means for pressing the types against a sheet of print paper, and a shift mechanism for moving the hammer means into positions confronting the type belts, respectively, and for keeping the hammer means in one of the positions at a time.

Abstract: A type band for a printer comprises a track of marks to be scanned (timing marks) at least one of which is obliquely positioned relative to its adjoining marks. The centers of all marks are equidistantly spaced. When the horizontally moving type band is vertically displaced, the time spacing of the scanning signal of the obliquely positioned timing mark is changed over the scanning signal of its adjacent timing mark. The magnitude of the vertical displacement of the type band is derived from the change in this time spacing. The displacement data thus obtained permit compensating for the vertical displacement of the type band (using, for instance, a stepper motor).

Abstract: A type arrangement data editing apparatus in which type arrangement data from a type carrier is automatically edited in accordance with the carrier set carried by the type carrier. A first area of a ROM stores the basic type arrangement data for a plurality of basic character sets. A second area of the ROM stores replacement data which is replaced for specific symbols in the basic character sets, and the start addresses of the type arrangement data for each set. An identifier identifies which character set and which replacement data are carried on the type carrier. A microprocessor stores a program for retrieving the respective type arrangement data and inserting the replacement data therein. The data is sent to a RAM, where it is compared to input data to print a specific print symbol.

Abstract: A device for cleaning a rotary type-carrier, in which a brush which contacts the type-carrier continuously to clean it during normal operation may be moved so that its rotary center is positioned more closely to the type-carrier. As a result, as the brush wears out, it may maintain contact with the type-carrier, obviating the need for frequent replacement.

Abstract: In the print band timing system described herein, the bipolar pulse generated in a sensor by the passage of a print band timing mark is applied to a discriminating circuit which compares the pulse signal with a voltage level substantially equal to the nominal d.c. level of the sensor signal. Hystereis is provided in one direction only so that the nominal zero crossing is precisely determined in a time position relationship.

Abstract: A device for monitoring and compensating for changes in the flight time of the print hammers of impact printers is disclosed. The flight time of the respectively monitored hammer is calculated from the elapsed time between the moment of firing of a hammer and the moment of impact of the print type carrier against the impact platen. In order to ensure automatic self-adjustment of all print hammers in predetermined test cycles, without the actual printing process itself being affected, and without there being any test imprints on the record carrier, the print type carrier includes, in addition to the standard print types, an additional test type. The impact surface area of the test type is large enough such that no visible imprint is made upon its impact on the record carrier because of the low impact pressure.

Abstract: A printer for printing characters on a recording medium includes, a printing drum provided on a first portion and a second portion of the outer periphery thereof respectively with a first set of type faces and a second set of type faces, the first set of type faces being adapted to print characters of odd or even digit positions in a row of characters to be printed while the second set of type faces is adapted to print remaining characters of even or odd digit positions in the row of characters to be printed, the top surface of each of the first and second sets of type faces being retracted from the outer periphery of the printing drum, and each face being provided with a resilient member on at least a part of circumference thereof; a hammer unit positioned in the printing drum and provided with a plurality of hammers, the hammers being adapted to selectively thrust faces of the first and second sets through the outer periphery of the printing drum to bring the hammers in pressure contact with the recording m

Abstract: The present invention relates to a dot matrix printer which makes use of multiple dot patterns distributed on the cylinder, belt, hand or drum of a line printer to provide an improved printing throughput for an all addressable line printer. In a dot-helix matrix printer, different arrangements of the dots are used which can be varied in position and spacing to increase printing speed. On a belt, band or drum line printer, multiple dot patterns are given a predetermined distribution. More specifically, arrangements of dots are used which provide enhanced performance due to the fact that they are determined by an analysis of the statistical occurrence of a particular dot pattern in a character set. The higher statistical probability dot patterns are used more often on the belt, band or drum.

Abstract: A printer of the type including a platen, a bank of hammers extending in a straight line along and spaced from the platen and a continuous metal band of magnetizable material on which are mounted a plurality of print elements is provided with drive means for moving the band between the platen and the hammer bank and control means for controlling the movement of the band so that the print elements on the band move along the line of hammers. The band drive means includes a drive wheel located near one end of the hammer bank and means for forcing the band into close contact with the peripheral surface of the drive wheel. The means for forcing the band into close contact with the peripheral surface of the drive wheel can be a permanent magnet member located on the surface of the drive wheel. The band movement control means includes guide means for guiding the band so that it extends along the hammer bank and permanent magnet means adapted to force the band into close contact with the guide means.

Abstract: A multi-stage printer has an arithmetic section for calculating the next paper moving amount on the basis of a line position of a selected type stage of a plurality of type stages; printing is performed by a desired number of digits in a first line position by using first types selected from the groups of types; then, the distance from the printed first line position to a printed state-confirmable position away from the area opposed to the groups of types is calculated by the arithmetic section and the printing paper is moved by the paper moving means by an amount based on the result of the calculation thereby allowing the printed first line position to be moved up to the confirmable position; then, before printing in a second line position by using second types selected from the groups of types, the distance from the printed first line position now occupying the confirmable position to the second selected types is subtracted from a predetermined printing inter-line pitch in the arithmetic section and the pri

Abstract: A printer comprises paper feed means for feeding a sheet of print paper in a prescribed direction, a plurality of type groups arranged in tiers along the prescribed direction and each having a set of types, a hammer assembly shiftable across the tiers of the type groups for pressing a selected one of the types against the sheet of print paper, means for shifting the hammer assembly across the tiers of the type groups, an arithmetic unit for computing a next amount of feed of the sheet of print paper based on a position of the selected type with reference to a direction across the tiers of the type groups, and paper feed control means for controlling the paper feed means to feed the sheet of print paper and the shifting means to shift the hammer assembly in relation to each other for intervals of time controlled on the basis of the amount of feed of the sheet of print paper as computed by the arithmetic unit.

Abstract: A printing apparatus is provided which utilizes rolling pressure contact for printing, and includes a plurality of sets of serially arranged character elements mounted for movement on the external surface of a printing drum. Movement of the sets to place a desired character into printing position is accomplished by controlling the speed of a motor driving a pulley connected by cable to a given character set, relative to the speed of a motor driving the printing drum in rotational movement.

Abstract: A dot matrix printer is described in which the dots are formed by impact at an intersection between a raised ridge on a platen and a vertical ridge or bar font member. A moving belt carries a plurality of individually mounted vertical bar segments. The bar segments are each mounted on a flexible finger and can be deflected out of the path of the moving belt by impact from a print hammer mechanism. The vertical bars may be caused thusly to individually impact against a platen arranged parallel to the line of travel of the fingers. The platen may have a plurality of raised knife-edge ridges on its surface. By appropriate timing of hammer actuations, individual bar elements may be caused to impact against the knife-edge ridges on the platen. If the paper and ribbon are interposed between the bar fingers and the knife-edge ridges, a mark in the shape of the intersectional area between the bar and the knife-edge ridge can be made.

Abstract: Circuit for detecting variations in the nominal velocity of a character band and adjusting the hammer firing times to compensate for the variations. This circuit measures deviations in band velocity that are either faster or slower than a nominal velocity during each character emitter pulse and makes an appropriate correction in the subscan times that gate the hammer firing signals. A bidirectional counter is counted up at a high frequency to a value representing the emitter period including the velocity deviation and then counted down after the error determination at a selected frequency that is a preselected fraction of the high frequency. This technique corrects for each character emitter pulse and incorporates a timing proportionality to assure correct hammer impact.

Abstract: An improved pulley system for use with band printers or the like. A steel printing band is looped around a pair of capstans covered by sleeves made of elastomeric material. The sleeves include a plurality of downwardly angled flexible circumferential flanges and a lower horizontal rim. The band contacts the flanges and as the capstans rotate, inward force on the band is transferred to a downward force by means of the flanges. The downward force causes the band to move into contact with the lower horizontal rim, thereby vertically aligning the band in the printer. In an alternate embodiment, a plurality of non-flexible circumferential ridges are included. The central ridges extend farther out from the surface of the sleeve and serve to define a crown. The sleeve configuration serves to reduce wear and accurately align the printing band within the printer assembly.

Abstract: A strip assembly for a printing device having an endless type band frictionally driven by drive and idler pulleys between print hammers and a platen comprises a wear strip and wiper strip attached together at a common end. The wiper strip has a wiper portion extending from the point of attachment which terminates in a scraper edge. A retention device mounted in proximity with the drive pulley comprises means connectable to the common end to hold said wear strip under tension and said wiper strip in spring loaded condition with the scraper edge in contact with the drive surface of the drive pulley for cleaning wear strip residue and other deposits from the pulleys and the type band.

Abstract: A compact printer having a typefont belt constituting a typefont wheel maintained under tension on a support, wherein the platen is rendered displaceable in a direction away from the typefont wheel after the completion of the printing operation, and the front end of a hammer provided in the typefont wheel is inclined upwards.

Abstract: To reduce the extremely high wear in steel belt printers, a revolving tape is arranged between the revolving steel belt and the platen.

Abstract: A 384-character type carrier for use in a line printer coupled to a computer using a 240-character type data array of Q sets of P printable characters each. The type carrier includes K sets of characters each including P printable characters and R dummy characters, with K>Q and 384=K.multidot.(P+R).

Abstract: There is disclosed an integrated cylindrical formation of plural lines of a printing type belt in such a printing type drum as contains a hammer unit therein, has plural lines of printing type belts installed round the periphery of the cylindrically formed drum body and supplied printing ink to the types by pressing an ink roller against the printing type belts.

Abstract: There is provided a small printer capable of effecting printing in two colors by a simple structure. The small printer comprises a base formed in a cylindrical shape, a plurality of places of printing type belts mounted on the outer peripheral surface of the base, two sets of printing type groups of the same pattern formed on the printing type belts circumferentially thereof, hammer units corresponding to the printing type belts and contained in the base, and a pair of ink rollers capable of applying inks of distinct colors to the different printing type groups formed on the printing type belts.