US3374873A - Printing apparatus employing bidirectional stepping motors to position type member - Google Patents
Printing apparatus employing bidirectional stepping motors to position type member Download PDFInfo
- Publication number
- US3374873A US3374873A US345342A US34534264A US3374873A US 3374873 A US3374873 A US 3374873A US 345342 A US345342 A US 345342A US 34534264 A US34534264 A US 34534264A US 3374873 A US3374873 A US 3374873A
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- United States
- Prior art keywords
- stepping
- font
- type
- pulses
- printing
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- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
- B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
- B41J1/32—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being parallel to the axis of rotation, e.g. with type on the periphery of cylindrical carriers
- B41J1/44—Carriers stationary for impression
- B41J1/46—Types or dies fixed on wheel, drum, cylinder, or like carriers
- B41J1/50—Types or dies fixed on wheel, drum, cylinder, or like carriers with one or more carriers travelling across copy material in letter-space direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J7/00—Type-selecting or type-actuating mechanisms
- B41J7/50—Type-face selected by combinations of two movements of type carrier
- B41J7/52—Type-face selected by combinations of two movements of type carrier by combined rotary and sliding movement
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
- H04L17/16—Apparatus or circuits at the receiving end
- H04L17/26—Apparatus or circuits at the receiving end using aggregate motion translation
Definitions
- the present invention relates to a printing apparatus
- the present invention comprises a'type element or font which may. take a generally-cylindrical configuration anrl which bears type for various symbols .upon its peripheral surface, and is mounted so that it may be variously displaced to present different symbols in a printing position.
- the system further includes means for providing electrical pulses in sequences, indicative of the desired displacement for the type element" or font to accomplish a predetermined symbol. Stepping motors, i.e. motors which accomplish a predetermined rotational displacement upon receiving an electrical pulse, are then provided to receive the sequence of pulses and are connected to position the type font accordingly.
- the system further includes apparatus for activating the type font to accomplish a printed symbol after the desired symbol has been properly positioned.
- An object of the present invention is to provide an improved printer which may be embodied in a compact rugged form.
- Another object of the present invention is to provide an improved telegraphic printer with simplified mechanical controls.
- Still another object of the present invention is to provide an improved printing mechanism, which may be economically constructed-in a form sufliciently rugged for practical mobile use.
- a further object of the present invention is to provide an improved telegraphic printer which employs digital stepping motors to position a type font in accordance with electrical command signals.
- Still a further object of the present invention is'to provide' a system wherein electrical code signals indicative of symbols are decoded into a sequence of pulses, numerically indicative of the'symbol, and further including a digital stepping motor to receive said pulses and thereby position a type font to print a selected symbol.
- FIGURE 1 is a perspective view of a telegraphic printer incorporating the principles of the present invention
- FIGURE 2 is a perspective and diagrammatic view of the mechanical system employed in the printer of FIGURE 1; and 1 I FIGURE 3 is a diagrammatic representation of the electrical system employed in the printer of FIGURE 1.
- printer 10 receives electrical. signals, as by radio or direct line for example, which signals are representative of various symbols carried on a type font (not shown'in FIGURE-1').
- the type font in the machine operates in cooperation with a hammer 14 which is carried on a shaft 16 in front of a printing ribbon 18.
- the hammer 14 and the type font (not shown) are positioned in accordance with the re ceived electrical signals, so that the hammer 14 lies over the section of the paper. 12 upon which the next symbol is to be printed, while the commanded symbol lies immediately under the hammer, behind the paper.
- the hammer 14 is driven against the ribbon 18 which engages the paper 12 that is backed by the type or print lines of the desired symbol which is thus printed.
- an important feature of the present invention resides in the manner in which the type font, along with the other mechanical elements in the printer, are positioned, by the use of digital stepping motor apparatus.
- a type hammer 20 which operates in conjunction with a type cylinder or font 22.
- the font 22 as shown in FIGURE 2 has eight rows 24 of type symbols 26 spaced about its periphery and each of the rows 24 contain eight symbol positions. Therefore, to provide a desired symbol under the hammer 20, the font 22 may have to be displaced rotationally about its axis (to locate a proper row 24), and along its axis (to locate a particular symbol 26).
- the font 22 may be variously constructed, as for example, of lightweight plastic material to which a metallic surface containing type symbols is applied. Such a structure preserves the weight of the font low with resultant low inertia.
- various other embodiments for the type cylinder or font 22 are practical in accordance with the knowledge of the prior art.
- the type cylinder or font 22 is mounted between the arms 27 of a frame 28, that is fixed against rotation and carried on a splined shaft along with the font.
- the frame 28 is placed to the proper position along the shaft 30, then the shaft 30 revolves the font 22 to select the desired letter. Thereafter, a print ribbon 32 raises to a position between the font 22 and the hammer 20, after which the hammer 20 strikes the ribbon 32 against a printing medium or paper 34 (shown in phantom).
- the ribbon 32 drops back into position to reveal the print while the hammer 20 and the type font 22 advance to the next character location on the paper 34-.
- the frame 28 slides on a guide shaft 36 which holds the frame against rotational displacement as the shaft 30 revolves.
- the frame 28 is generally of U-sha'ped configuration, with the shaft 30 extending through bearings 38 contained in arms 27, and through the type font 22, engaging the latter.
- One end 40 of an inelastic cable 42 is connected at one side of the frame 28 while an end of a similar cable 44 is connected at the other side. These cables are driven to travel the frame 28 along with the font 22 across the width of the paper 34.
- the cable 42 passes over a rotatively-mounted stationary pulley 46, reverses direction, and passes over a similar pulley 48 to again reverse direction and pass over a single movable rotatively-mounted pulley 50, then is taken up on a rotativelymounted stationary drum 52.
- the cable 44 in a somewhat similar manner passes from the frame 28 over a stationary rotatively-mounted pulley 54, then over a similar pulley 56, and over a movable rotatively-mounted pulley 58 to be taken up on a rotatively-mounted drum 60.
- the pulleys 58 and 50 are mounted respectively in blocks 62 and 64 which are connected by a cable 66 that passes around a drive capstan 68 of a stepping motor 70.
- the stepping motor 70 may, for example, take the form of various models manufactured by Pace Controls Corporation of Needham Heights, Mass, which motors provide a predetermined angular displacement of a rotative shaft upon receipt of a digital pulse. Of course, various other forms of stepping motors have also proved satis. factory in the system.
- the stepping motor 70 acts through the cable 66, the pulleys 50 and 58, and the cables 42 and 44, to place the type font 22 in any of eight positions, each of which prov des one symbol location under the hammer 20.
- a stepping motor 72 similar to the motor 70 drives a capstan 74 carrying an endless cable 76 which passes over a drive wheel 73 mounted on the splined shaft 30.
- the stepping motor 72 revolves the shaft 30 through the cable 76, to in turn revolve the font 22 and position any of eight rows 24 of symbols 26 under the hammer 20.
- the motors 70 and 72 After the motors 70 and 72 have operated to position the desired symbol space under the hammer 20, the symbol is printed and the font is returned to home position. Somewhat simultaneously the hammer 20 and the font 22 are moved to the next area on the paper.
- the printing operation is accomplished in several steps, the first being energization of a solenoid coil 80 acting through an armature 82 and a pivotally-mounted lift linkage 84, to raise the ribbon 32 to a position between the hammer 20 and the type font 22.
- the ribbon 32 is carried on spools 86 and 88 as well known in the prior art and may include an automatic mechanism, also as well known in the prior art to variously advance the ribbon from one spool to the other providing even wear over the ribbon 32.
- a printing or typing solenoid coil 90 is energized acting through an armature 92 and a shaft extension 94 to drive the hammer 20 against the ribbon 32.
- the extension 92 is journaled through a pivotally-mounted support block 96, to pass through the splined shaft 98 carrying the hammer 20, then into a pivotally-mounted support block 100.
- the hammer 20 includes a head 102 which provides the actual striking surface, and which is integrally formed with an annulus 104 in which the splined shaft 98 is matingly received.
- the solenoid coils 80 and 90 are deenergized permitting the hammer 20 and the ribbon 32 to fall back into their quiescent positions.
- the hammer 20 and the type font 22 are advanced one step to the right so that the hammer 20 dwells over the next area to receive a symbol.
- the hammer and type font are moved stepwise to the right by a stepping motor 106 which may be similar to the stepping motors previously described, and which carries a capstan 108 that drives a looped cable 110, the ends of which are affixed to the hammer 20.
- the cable 110 passes about corner pulleys 112 and 114 which are axially mounted on drums 60 and 52 respectively.
- the drums 60 and 52 receive the end of the cables 42 and 44 respectively which are afiixed thereto. Therefore, on rotation of the pulleys 112 and 114, to accommodate the movement of the cable 110 to drive the hammer 20, the drums 52 and 60 are also revolved shifting the position of the pulleys 50 and 58 to advance the position of the font 22.
- the stepping motor 106 is pulsed to revolve the capstan 108 in a clockwise direction thereby pulling the hammer 20 one step to the right through the cable 110, and moving the type font 22 one step to the right through the pulleys 58 and 50 and the cables 42 and 44. After the stepping motion, the printer is ready for another symbol to be printed.
- the hammer. 20 and the type font 22 are returned to the left preparatory to printing another sequence of symbols.
- This operation is accomplished by the stepping motor 106 moving in a reverse direction under control of electrical impulses as described below.
- the paper 34 In addition to returning the hammer 20 and the type font '22 to the left position, the paper 34 must be raised one line.
- the paper 34 is raised by a solenoid coil 116, the armature 118 of which engages a ratchet 120 affixed to a drive roller 122 which mates with a backup roller 124.
- the solenoid coil 116 is energized, the ratchet 120 is stepped revolving the roller 122 in a clockwise direction raising the paper 34 to the next line to receive another roll of print.
- the stepping motors considered in FIGURE 2 along with the solenoid coils are controlled by electrical signals which are derived from applied code pulses. The manner in which these signals are derived will now be considered with reference to FIGURE 3.
- FIGURE 3 At the top of FIGURE 3 are a set of terminals .126 labelled b through b and separately provided to receive the five parallel bits of a Baudot telegraphic code. That is, parallel pulse-no pulse (binary) code signals are separately applied to the terminals 126- to manifest various commands and symbols. A synchronizing signal, or clock pulse, for the parallel code is applied to a terminal 128 to manifest the time interval during which a set of code signals are manifest.
- parallel pulse-no pulse (binary) code signals are separately applied to the terminals 126- to manifest various commands and symbols.
- a synchronizing signal, or clock pulse, for the parallel code is applied to a terminal 128 to manifest the time interval during which a set of code signals are manifest.
- code signals may be employed in accordance with the present invention, for example, both parallel and serial signals may be employed and virtually any form of representation or format may be utilized so long as a separate code is provided for each symbol or command to he identified.
- pulse shaper circuits 131 which may take the form of six separate trigger circuits or other networks to form discrete noise-free pulses in the parallel lines 130, coinciding to the input terminals.
- six lines 130 emerging from the pulse shaper circuits 131 carry signals b through b and sync which are applied to a machinefunction decoding matrix 132.
- the decoding matrix 132 may comprise a plurality of diodes or other logic network elements to provide a translation of the input code signals to a form of coding applicable to the present system.
- various translating o-r decoding matrix techniques are well known in the prior switching art to accomplish this function, as for example is taught in the book Arithmetic Operations in Digital Computers, by R. K. Richards, published 1955 by D. Van Nostrand Co.
- the matrix 132 provides five outputs on conductors 134 through 142 through 138 which are coded to designate the various symbols desired to be printed. Furthermore the decoding matrix 132 also recognizes a particular input code to indicate: a space; a carriage return; and a designation for the following code groups are letters or figures.
- the matrix Upon recognizing a space command, the matrix provides a pulse output on a conductor 144.
- the occurrence of a carriage return command provides a high output from the decoding matrix 132 on a conductor 146; and depending upon whether a command indicates letters or figures are to follow, a high output appears in either of the conductors 148 or 150, respectively.
- the conductors 148 and 150 are applied to the input terminals of a bistable multivibrator or flip-flop 152 which is represented by a somewhat-conventional symbol employed here throughout for that circuit. Essentially, the output of the flip-flop 152 provides another digit or binary signal b along with those contained in the conductors 134 through 138 to result in a six-bit binary code word.
- the output from the flip-flop 152 to conductor 154 changes only after a command signal is given to the decoding matrix 132, instructing that the following code signal or code signals shall be interpreted as letters for example.
- the six-bit code word emerging from the matrix 132 in the conductors 134 through 138 and from the flipflop 152 in conductor 154 may follow the format set forth in the following Table 1. Note that the conductor 154 carries the most significant binary digit, conductors 137 and 138 next, and conductors 134, 135 and 136 carrying the least-significant digits.
- the and gates may take the form of any of a variety of coincidence circuits which pass the high state of a two-state signal upon simultaneously receiving all input signals in a high state. These gates are represented in FIGURE 3 by a symbol somewhat conventional in the art which is employed here throughout to manifest a coincidence or and gate.
- a similar set of and gates 170, 172 and 174 receive inputs from the conductors 134, 135, and 136 respectively carrying the less-significant digits of the code words set forth above, and are also qualified by the synchronizing signals appearing in the conductor 168.
- the digital signals passing through the gates 170, 172 and 174 are registered in a stepping register 176 while the similar signals passing through the gate circuits 1 6-2, 164 and 166 are registered in a similar register 178.
- the stepping register 176 contains the three least-significant digits of the codes set forth in the above chart while the register 178 contains the three most-significant digits.
- the three digits in each of the registers serve to control in one case the rotational displacement from a home position of the type font 22 as shown in FIGURE 1, and second the displacement of the font 22 parallel its axis.
- the contents of the stepping register 176 serve to control the rotational or angular displacement of the font whiIe the contents of the stepping register 178 serve to control the linear displacement of the font along its axis, both in accordance with the table set forth above.
- the stepping registers 176 and 178 may comprise a variety of binary digital stepping registers which include three binary stages and are thus capable of accomplishing three binary digits to represent values up to eight.
- the registers 176 and 178 may be constructed in accordance with well known prior art principles using magnetic core elements or various other two-state devices interconnected in a step-register configuration.
- this composite code 010, 0 designates the symbol S and requires a rotational displacement of four positions along with a transverse displacement of two positions. Therefore, in accordance with the table, the stepping register 176 contains a binary equivalent four while the stepping register 17 8 registers two.
- the registers 176 and 178 With the registers 176 and 178 in the configuration described, assume a flip-flop 181) (upper right in FIGURE 3) is in a set state as a result of receiving the synchronizing signal from the conductor 168. Therefore, the high output from the flip-flop 168 qualifies an and gate 182 permitting pulses of regular interval from a pulse generator 184 to pass through the and gate 182 to the stepping register 176.
- the gate circuit 182 in addition to receiving pulses from the generator 184 and qualification by the flip-flop 180, receives a signal from a zero detector circuit 186 which functions to detect the clear state of the stepping register 176.
- the zero detector circuit 186 may take a variety of forms, one of which is simply a Well known or gate connected to receive a one output from each of the stages of the stepping register to provide a high output if any of the stages contain a one.
- the stepping register 176 receives clearing pulses through the gate 182 which remains qualified as long as the register 176 contains a value above zero.
- the pulses applied to the stepping register 176 are also applied through a conductor 188 to a control circuit 190 func* tioning in conjunction with a stepping motor 72 as described in FIGURE 2.
- the identical number of pulses required to clear the stepping register 176 is applied to the stepping motor 72 advancing that motor by a number of angular increments coinciding to the number of pulses received.
- the control circuit 190 may take various forms, well known in the prior art, as manufactured with the step-ping motor 72 described above. In function, the control circuit has two distinct inputs; in input F to result in forward motion by the stepping motor and an input R that results in reverse motion by the step motor.
- Control of the stepping motor 68 to move the type font along its axis is accomplished in a somewhat similar fashion during the reset operation of the stepping register 178.
- the stepping register 178 receives pulses from the pulse generator 184 through an and gate 192 which is qualified by the flipfiop 180, and a zero-detector circuit 194 similar to circuit 186, as previously described.
- the zero-detector circuit 194 provides an output as long as the stepping register 178 contains any binary ones; however, when the register is clear, the zero detector circuit 194 provides the low value of a two-state signal, thereby disqualifying the gate 192.
- the pulses passed by the and gate 192 from the pulse generator 184 to clear the stepping register are also applied through a conductor 196 to the input F of the control circuit 200 functioning in conjunction with the step motor 68.
- register 176 contains a binary value 100 (number other than zero) a high signal passes from the zero detector circuit 186, which along with the high output from the flip-flop 18d qualifies the and gate 182 so that pulses from the pulse generator 184 pass to the stepping register 176 and to the input F of the control circuit to advance the stepping motor 72.
- the binary value 100 is the equivalent of decimal four, therefore, four pulses are required to clear the stepping register 176.
- the same pulses employed to clear the stepping register are applied through the conductor 188 to advance the stepping motor 72 by four positions, in accordance with the table set forth above to accomplish the desired rotational displacement of the type font to locate the symbol S.
- the zero detector circuit 194 and the multivibrator 180 qualify the and gate 192 to permit the passage of pulses from the generator 184 to the stepping register 178.
- the stepping register 178 contains a binary digital value 100, equivalent decimal two; therefore, two pulses are required to be applied to the stepping register before it is reset.
- the stepping register 178 is detected to contain zero by the circuit 194 thereby immediately disqualifies the gate 192.
- the two pulses to reset the stepping register 178 are also applied through the input F of the control circuit 200 to advance the stepping motor 70 two positions and accomplish the desired linear displacement of the type font 22 to provide the symbol S in a position to print.
- the desired symbol S is in a position tobe printed and the zero detector circuits 186 and 194 both provide low outputs indicating both the registers 176 and 178 have been cleared.
- This condition is sensed by an and gate 202 which is connected to receive one input through an inverter circuit 204 from the zero detector circuit 186 and another input through an inverter circuit 206 from the zero detector circuit 194.
- the and gate 202 receiving inverted forms of the signals provides a high output of a two-state signal when both the stepping registers 176 and 178 are cleared.
- the high output from the gate circuit 202 resets the multivibrator 180 and pulses a delay circuit 208, which after a predetermined delay interval provides a pulse in a conductor 210.
- the conductor 210 is connected to the print solenoid 90, the ribbon solenoid 80, and a delay circuit 216.
- the pulse from the delay circuit 208 applied to the print solenoid 90 and the ribbon solenoid 80 activates the hammer as previously described and the ribbon, to accomplish the selected symbol as a printed letter on the paper.
- the pulse from the delay circuit 268 applied through the delay circuit 216 serves to set a flip-flop 219 providing a high output to and gates 222 and 224.
- the pulse employed to set the flip-flop 219 also serves to set a flip-flop 225 which provides a high output to and gates 226 and 228. This portion of the system serves to reset the stepping motors 68 and 72 to return the type font to home position, i.e. the zero or dwell position.
- the disk 234 upon reaching the home position closes the switch 238 to apply a positive signal through the gate 226 to reset the flip-flop 225 thereby inhibiting the gate 228.
- the stepping motors 68 and 72 are returned to the home position preparatory to another operation of positioning a desired symbol in a printing position.
- the delay circuits 216 which is applied through a conductor 241 to the input F of a control circuit 240 which functions in conjunction with the stepping motor 106.
- the single applied pulse advances the stepping motor 106 one position preparatory to printing the next symbol.
- the next position may be established as a space rather than a symbol, which occurrence is manifest by a pulse in the conductor 144 from the decoding matrix 132.
- the pulse appearing in the conductor 144 is applied to the control circuit 240* at the F input just as previously described to step the hammer 20 and the type font one more position to the right, leaving a blank space.
- the system functions to accomplish a complete line of type, after which it is necessary to return the printing elements to the starting position of a new line of type and advance the paper horizontally one line.
- the carriage return pulse sensed and formed from the decoding matrix 132 upon receiving such a command is applied through a conductor 146 to a flip-flop 245 resulting in a high signal from the flip-flop which energizes the roller step solenoid 116 to advance the paper as previously described.
- the flip-flop 245 also qualifies an and gate 247 permitting pulses from the generator 230 to pass to the reset input R of the control circuit 240 thereby reverse stepping the stepping motor 106 until the associated disk 250 manifests the home position by closing a switch 252 which results in the application of a positive signal to reset the flip-flop 245.
- the gate 247 is disqualified; however, the printing elements have now been returned to the starting position for another line.
- the system of the present invention may be embodied in a compact unit wherein reliable stepping motors accomplish a simplified mechanical structure for reliable operation in mobile installations.
- Another important feature of the present invention resides in the use of step-ping registers in conjunction with the stepping motors to control the stepping motors.
- a printer for executing various symbols on command comprising:
- At least one bidirectional stepping motor having a home position and connected to receive said pulses for displacing said type elcment in accordance with said electrical pulses;
- a printer for a plurality of characters comprising:
- a plurality of bidirectional stepping motors each connected to receive one of said sets of electrical pulses and being mechanically coupled to said type body 'whereby to displace said type body in one direction;
- a printer for printing any of a plurality of characters in sequence on a printing medium comprising:
- a printer for printing any of a plurality of characters in sequence on a printing medium, in accordance with electrical code signals indicative of characters comprising:
- support means for supporting said printing medium contiguous said type body; mounting means for said type body whereby said body may be variously displaced to move each of said characters along at least two directional paths to position a select character in printing relationship to said medium; plural shift registers for receiving components of said electrical code signals indicative of characters;
- a printer according to claim 4 wherein said type body is generally cylindrical and said mounting means enables displacement along and about the central axis of said generally-cylindrical type body,
- a printer according to claim wherein said means to activate said type body comprises a ha'm-mer means to drive said printing medium against said type body to impress a character on said medium.
- a printer for printing any of a plurality of characters in sequence on a printing medium, in accordance with electrical code signals indicative of characters, comprisa type body having lines defining said characters about the surface thereof; means for supporting said printing medium continguous said type body;
- a plurality of birdireetional stepping motors each connected to receive one of said sets of electrical pulses and being mechanically coupled to said type body whereby to displace said type body in one direction;
- shift means to, shift said type body relative said print- 12 ing medium upon each printing operation whereby to provide a fresh section of said medium for said type body;
- a printer wherein said stepping motors include means to signal a home position thereof and wherein said system includes means for providing return step pulses to said stepping motors after each printing operation, terminated by said means to signal a home position.
- a printer according to claim 7 wherein said shift registers are connected to register component parts of said electrical code signals and wherein said system further includes means to provide pulses to form said sets of pulses, and to clear said code signals from said shift registers whereby to define said sets of pulses.
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Description
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US345342A US3374873A (en) | 1964-02-17 | 1964-02-17 | Printing apparatus employing bidirectional stepping motors to position type member |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US345342A US3374873A (en) | 1964-02-17 | 1964-02-17 | Printing apparatus employing bidirectional stepping motors to position type member |
US06/032,125 USRE30942E (en) | 1979-04-23 | 1979-04-23 | Printing apparatus employing bidirectional stepping motors to position type member |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US06/032,125 Reissue USRE30942E (en) | 1964-02-17 | 1979-04-23 | Printing apparatus employing bidirectional stepping motors to position type member |
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US3374873A true US3374873A (en) | 1968-03-26 |
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US345342A Expired - Lifetime US3374873A (en) | 1964-02-17 | 1964-02-17 | Printing apparatus employing bidirectional stepping motors to position type member |
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Cited By (32)
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US3495215A (en) * | 1965-12-30 | 1970-02-10 | Us Navy | Decoding system |
FR2027424A1 (en) * | 1968-12-31 | 1970-09-25 | Texas Instruments Inc | |
US3561581A (en) * | 1968-02-27 | 1971-02-09 | Codamite Corp | Signal-controlled printer |
US3565230A (en) * | 1967-05-05 | 1971-02-23 | Creed & Co Ltd | Printing mechanism with movable type wheel and hammer carriages |
US3596746A (en) * | 1968-09-25 | 1971-08-03 | Sagem | Multitype wheel printing machine |
US3599773A (en) * | 1968-04-23 | 1971-08-17 | Olivetti & Co Spa | Device for selectively positioning a member in a series of operative positions |
US3704666A (en) * | 1971-05-03 | 1972-12-05 | Burroughs Corp | High speed multiple tape serial printing mechanism |
US3710912A (en) * | 1969-04-16 | 1973-01-16 | Olivetti & Co Spa | High speed serial printing device for typewriters, teleprinters, calculating machines, accounting machines and the like |
US3710913A (en) * | 1968-12-31 | 1973-01-16 | Texas Instruments Inc | Electronic printing input-output station |
US3739344A (en) * | 1969-07-03 | 1973-06-12 | Olivetti & Co Spa | Data terminal apparatus having a device for aligning printed data |
US3804225A (en) * | 1971-08-31 | 1974-04-16 | C Ulin | Device in a type printer |
JPS5024027A (en) * | 1973-07-05 | 1975-03-14 | ||
US3872960A (en) * | 1972-02-25 | 1975-03-25 | Xerox Corp | High-speed printer with drift compensated cable for carriage |
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US3884338A (en) * | 1968-09-05 | 1975-05-20 | Siemens Ag | Device for adjustment and line-by-line movement of a type body in a type printing device |
US3927753A (en) * | 1969-08-22 | 1975-12-23 | Mite Corp | Solenoid system for moving a type member |
US3957151A (en) * | 1973-03-24 | 1976-05-18 | Casio Computer Co., Ltd. | Character printing device |
US4005772A (en) * | 1972-10-12 | 1977-02-01 | Harris Corporation | Automatic justifying typewriter having pitch changing and line spacing apparatus |
US4027764A (en) * | 1975-06-24 | 1977-06-07 | Casio Computer Co., Ltd. | Apparatus for confirming the correct impression of printing characters |
US4039067A (en) * | 1973-03-24 | 1977-08-02 | Casio Computer Co., Ltd. | Character printing device |
US4051942A (en) * | 1975-10-11 | 1977-10-04 | Alps Electric Co., Ltd. | Printing apparatus |
JPS55146779A (en) * | 1979-06-18 | 1980-11-15 | Canon Inc | Printing device |
US4244291A (en) * | 1977-11-08 | 1981-01-13 | Kabushiki Kaisha Suwa Seikosha | Printer with a fixed and an axially movable character ring |
US4264189A (en) * | 1979-09-17 | 1981-04-28 | Xerox Corporation | Duplexing in computer fanfold reproduction |
US4299477A (en) * | 1979-09-17 | 1981-11-10 | Xerox Corporation | Job recovery enhancement in computer fanfold reproduction |
US4313672A (en) * | 1979-09-17 | 1982-02-02 | Xerox Corporation | Stepper motor drive system in computer fanfold reproduction |
US4320960A (en) * | 1979-09-17 | 1982-03-23 | Xerox Corporation | Sensor controlling in computer fanfold reproduction |
US4328747A (en) * | 1979-03-23 | 1982-05-11 | Kabushiki Kaisha Suwa Seikosha | Character ring-selecting type printer |
US4401931A (en) * | 1980-12-08 | 1983-08-30 | International Business Machines Corporation | Apparatus actuated by a pair of stepper motors with shared drive |
JPS5947874A (en) * | 1983-08-08 | 1984-03-17 | Toshiba Corp | Picture formation device |
USRE31888E (en) * | 1979-09-17 | 1985-05-14 | Xerox Corporation | Sensor controlling in computer fanfold reproduction |
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US3495215A (en) * | 1965-12-30 | 1970-02-10 | Us Navy | Decoding system |
US3565230A (en) * | 1967-05-05 | 1971-02-23 | Creed & Co Ltd | Printing mechanism with movable type wheel and hammer carriages |
US3561581A (en) * | 1968-02-27 | 1971-02-09 | Codamite Corp | Signal-controlled printer |
US3599773A (en) * | 1968-04-23 | 1971-08-17 | Olivetti & Co Spa | Device for selectively positioning a member in a series of operative positions |
US3884338A (en) * | 1968-09-05 | 1975-05-20 | Siemens Ag | Device for adjustment and line-by-line movement of a type body in a type printing device |
US3596746A (en) * | 1968-09-25 | 1971-08-03 | Sagem | Multitype wheel printing machine |
US3638197A (en) * | 1968-12-31 | 1972-01-25 | Texas Instruments Inc | Electronic printing input-output station |
US3710913A (en) * | 1968-12-31 | 1973-01-16 | Texas Instruments Inc | Electronic printing input-output station |
FR2027424A1 (en) * | 1968-12-31 | 1970-09-25 | Texas Instruments Inc | |
US3710912A (en) * | 1969-04-16 | 1973-01-16 | Olivetti & Co Spa | High speed serial printing device for typewriters, teleprinters, calculating machines, accounting machines and the like |
US3739344A (en) * | 1969-07-03 | 1973-06-12 | Olivetti & Co Spa | Data terminal apparatus having a device for aligning printed data |
US3927753A (en) * | 1969-08-22 | 1975-12-23 | Mite Corp | Solenoid system for moving a type member |
US3704666A (en) * | 1971-05-03 | 1972-12-05 | Burroughs Corp | High speed multiple tape serial printing mechanism |
US3804225A (en) * | 1971-08-31 | 1974-04-16 | C Ulin | Device in a type printer |
US3872960A (en) * | 1972-02-25 | 1975-03-25 | Xerox Corp | High-speed printer with drift compensated cable for carriage |
US4005772A (en) * | 1972-10-12 | 1977-02-01 | Harris Corporation | Automatic justifying typewriter having pitch changing and line spacing apparatus |
US3874493A (en) * | 1972-11-06 | 1975-04-01 | Texas Instruments Inc | Electronic page printer |
US3957151A (en) * | 1973-03-24 | 1976-05-18 | Casio Computer Co., Ltd. | Character printing device |
US4039067A (en) * | 1973-03-24 | 1977-08-02 | Casio Computer Co., Ltd. | Character printing device |
JPS5024027A (en) * | 1973-07-05 | 1975-03-14 | ||
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US4027764A (en) * | 1975-06-24 | 1977-06-07 | Casio Computer Co., Ltd. | Apparatus for confirming the correct impression of printing characters |
US4051942A (en) * | 1975-10-11 | 1977-10-04 | Alps Electric Co., Ltd. | Printing apparatus |
US4244291A (en) * | 1977-11-08 | 1981-01-13 | Kabushiki Kaisha Suwa Seikosha | Printer with a fixed and an axially movable character ring |
US4328747A (en) * | 1979-03-23 | 1982-05-11 | Kabushiki Kaisha Suwa Seikosha | Character ring-selecting type printer |
JPS55146779A (en) * | 1979-06-18 | 1980-11-15 | Canon Inc | Printing device |
JPS6048350B2 (en) * | 1979-06-18 | 1985-10-26 | キヤノン株式会社 | printing device |
US4299477A (en) * | 1979-09-17 | 1981-11-10 | Xerox Corporation | Job recovery enhancement in computer fanfold reproduction |
US4320960A (en) * | 1979-09-17 | 1982-03-23 | Xerox Corporation | Sensor controlling in computer fanfold reproduction |
US4313672A (en) * | 1979-09-17 | 1982-02-02 | Xerox Corporation | Stepper motor drive system in computer fanfold reproduction |
USRE31888E (en) * | 1979-09-17 | 1985-05-14 | Xerox Corporation | Sensor controlling in computer fanfold reproduction |
US4264189A (en) * | 1979-09-17 | 1981-04-28 | Xerox Corporation | Duplexing in computer fanfold reproduction |
US4401931A (en) * | 1980-12-08 | 1983-08-30 | International Business Machines Corporation | Apparatus actuated by a pair of stepper motors with shared drive |
JPS5947874A (en) * | 1983-08-08 | 1984-03-17 | Toshiba Corp | Picture formation device |
JPS6028184B2 (en) * | 1983-08-08 | 1985-07-03 | 株式会社東芝 | image forming device |
EP0374457A2 (en) † | 1988-12-19 | 1990-06-27 | Cytec Technology Corp. | A method of flocculating a dispersion of suspended solids |
EP0374457B2 (en) † | 1988-12-19 | 2000-07-12 | Cytec Technology Corp. | A method of flocculating a dispersion of suspended solids |
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