JPH0354634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0002] The present invention relates to a printing machine, and more particularly to a printing machine in which a carriage rotatably supports a type carrying element having a large number of type characters relative to a platen mounted on a machine frame along the platen. This invention relates to a printing machine configured such that a transfer operation of moving the type by moving the type and a selection operation of rotating and indexing the type supporting element to select a desired type are selectively performed in conjunction with one electric motor. It is.

Purpose of the Invention It is an object of the present invention to selectively switch between high power and low power and supply the motor with high power and low power during the carriage transfer operation and the selective operation of the type carrying element, thereby reducing the consumption of the motor. An object of the present invention is to provide a printing machine that can save power.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a carriage that is movable between a first position that allows execution of the selection operation during the transfer operation and a second position that allows execution of the transfer operation. a selection means for selecting the actuation, a moving means for moving the selection means to the first position or the second position, a first actuation signal generating means for generating an actuation signal of a high frequency, a second actuation signal generation means for generating an actuation signal of a certain frequency; and a second actuation signal generation means for supplying large power to the electric motor based on an actuation signal emitted by the first actuation signal generation means; and an actuation signal emitted by the second actuation signal generation means. switching means for supplying a small amount of electric power to the electric motor based on the switching means; and control means for causing the first actuation signal generating means to generate a high frequency actuation signal when the selection means is moved to the second position.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, a platen 2 is rotatably mounted on the machine frame 1, and printing paper (not shown) can be supported around the outer periphery thereof. A guide rod 3 and a guide plate 4 as guide bodies are provided on the machine frame 1 so as to extend parallel to the platen 2, and a carriage 5 can slide along the guide rod 3 and the guide plate 4. is supported by As shown in FIGS. 2 to 4, a rotary shaft 6 is rotatably supported on the carriage 5 on a substantially horizontal axis extending in the front-rear direction, and has a large number of printed characters 7a at its tip facing the platen 2. Type-carrying element 7
is installed.

As shown in FIGS. 1 and 2, a fixed mounting plate 8 is fixed to the right side surface of the machine frame 1, and a pulley 9 is rotatably supported on the outer side of the fixed mounting plate 8. A movable mounting plate 10 is rotatably supported on the left side of the machine frame 1 with an engagement protrusion 10a located approximately in the center in the vertical direction engaged with a small hole in the machine frame 1, and a pulley is provided on the outer side of the movable mounting plate 10. 11
is rotatably supported. An endless timing belt 12 is disposed between both pulleys 9 and 11 so as to extend parallel to the platen 2 with a tolerance to the pulley 5.
is hung. A spring 13 is hung between the movable mounting plate 10 and the machine frame 1 to bias the movable mounting plate 10 to rotate in the counterclockwise direction in FIG. 2, thereby applying tension to the timing belt. There is.

As shown in FIGS. 1 and 2, a single electric motor 14 consisting of a step motor is attached to the fixed mounting plate 8, and a timing belt is connected to the fixed mounting plate 8 via a driving gear 15 on the motor shaft and a driven gear 16 on the pulley 9. 1
It is designed to rotate 2. Rotation of the timing belt 12 based on the electric motor 14 creates a transport means for transporting the carriage 5 along the platen 2 and rotates and indexes the type carrying element 7 so that a predetermined type 7a corresponds to the platen 2. A selection operation for selecting a predetermined printing position can be selectively performed.

As shown in FIGS. 1, 4 and 5, a hammer 17 is rotatably supported on the carriage 5 by a support shaft 18 in correspondence with the type carrying element 7, and a drive pin 19 projects from the lower end side of the hammer 17. It is set up. A spring 20 is suspended between the hammer 17 and the carriage 5, and the force of the spring always biases and holds the hammer 17 in its original, substantially vertical position shown by solid lines in FIGS. As shown in FIGS. 2 and 5, a printing solenoid 21 is mounted on the carriage 5, and when it is energized, the armature 22 is rotated clockwise in FIG. 5 against the action of a spring 23, and the drive pin The hammer 17 is rotated counterclockwise in the figure via the hammer 19 to push one type 7a on the type supporting element 7 selectively arranged at the printing position toward the platen 2. .

Note that in this embodiment, the hammer 17
is rotated by the rotation of the armature 22 based on the excitation of the solenoid 21 from the original position to the position A shown by the chain line as shown by the solid line in FIG. It is becoming more and more popular.

As shown in FIG. 1, a ribbon cassette 24 is supported on the carriage 5, and a ribbon 25 wound around a supply reel 26 is stored inside the ribbon cassette 24. A part of the ribbon 25 is exposed outside the ribbon cassette 24 and placed between the platen 2 and the type 7a, and the hammer 1
When the printing type 7a is pressed by the printer 7, printing is performed on the printing paper on the platen 2 via the ribbon 25. Further, this ribbon 25 is transported by a predetermined amount by a feed roller 27 provided in the ribbon cassette 24 for each printing operation, and is wound onto a take-up reel 28.

On the other hand, as shown in FIGS. 2 to 4, a transmission gear 29 is fixed to the rotating shaft 6 on the carriage 5, and is located between the upper and lower belt pieces of the timing belt 12 and can be engaged with the lower belt piece. It's becoming like that. A pair of guide rollers 30 are rotatably supported on the carriage 5 near both sides of the transmission gear 29, and as shown in FIG.
The lower belt piece is pressed against the outer periphery of the transmission gear 29 so that both 12 and 29 mesh over a wide range. Therefore, the transmission gear 2 is rotated by the rotation of the timing belt 12 based on the electric motor 14.
The rotary shaft 6 is rotationally driven via the rotary shaft 9 .

As shown in FIGS. 2 to 4, a ratchet wheel 31 is fixed to the end face of the transmission gear 29, and rotation of the rotating shaft 6 can be prevented through the ratchet wheel 31. A selection member 32 serving as selection means is rotatably supported on the carriage 5 by a substantially horizontal support 33 so as to be rotatable below the ratchet wheel 31 in a substantially vertical plane passing through the axis of the rotating shaft 6. , as shown in Figures 2 and 4, there is a ratchet wheel 31 at the top of the tip.
A claw portion 32a that can be engaged and detached from the claw piece is formed, and an engagement portion 32b that can be engaged and detached from a rubber engagement body 34 provided in the movement range of the carriage 5 on the machine frame 1 is formed at the lower tip. is formed, and an operating piece 32c extends from the right side.

A spring 35 is hung between the selection member 32 and the carriage 5.
Rotating force is applied in the clockwise direction in the figure. and,
Due to the action of this spring 35, the selection member 32 always engages one pawl of the ratchet wheel 31 from below at its pawl portion 32a, as shown by the solid line in FIG.
It is biased and held in a second position that prevents rotation of the rotating shaft 6 and allows execution of the transfer operation. A solenoid 36 as a moving means for switching and moving the selection member 32 between the above-mentioned second position and a later-described first position is mounted on the carriage 5, and the armature 37 has an operating piece 32c of the selection member 32.
are connected by a connecting pin 38. and,
As the solenoid 36 is energized, the selection member 32 is rotated counterclockwise from the rotation blocking position shown by the solid line in FIG. It is adapted to be placed in a first position in which it engages with the coupling 34 to prevent movement of the carriage 5 and to permit execution of said selection operation.

Further, in this embodiment, when the selection member 32 is disposed at the second position, the electric motor 14
The carriage 5 is moved along the guide rod 3 and the guide plate 4 by rotating the timing belt 12 as the timing belt 12 rotates. Further, with the selection member 32 disposed at the first position,
By rotating the timing belt 12 with the rotation of the electric motor 14, the type selection rotation of the type carrying element 7 is performed.

Next, the configuration of a drive device for driving the electric motor 14 and the like will be explained based on FIGS. 6 and 7.

Now, a keyboard 39 shown in FIG. 6 is provided at the front of the machine frame 1, and by selectively operating the keys on this keyboard 39, signals for printing, etc. can be input. When a print signal corresponding to a predetermined printed character 7a is input from the keyboard 39, the CPU 40 outputs an activation signal for the moving and printing solenoids 36, 21 at a predetermined timing, and also outputs an activation signal for the electric motor 14 at a predetermined timing. An actuation signal corresponding to the print signal etc. is output to the excitation phase switching circuit 41.

Further, the CPU 40 constitutes a switching means for switching three types of power supply circuits 59, 60, 61 that supply power to the electric motor 14,
Based on the control of this CPU 40, each power supply circuit 59, 60, 61 is selectively connected to the electric motor 14. Among the three types of power supply circuits, the high power supply circuit 59 is operated by the CPU 40 when the carriage 5 is transferred, and supplies high power to the electric motor 14. Further, the small power supply circuit 60 is operated by the CPU 40 when the type carrying element 7 is selected, and supplies small power to the electric motor 14. Furthermore, the holding power supply circuit 61 is operated by the CPU 40 when the carriage 5 is stationary other than during the transfer operation and the selection operation, and the holding power supply circuit 61 is operated by the CPU 40 to
A small amount of holding power is supplied to 4.

When the carriage 5 is moving, when the type carrying element 7 is selected, and when the carriage 5 is stationary except for both of these operations, a switching operation signal is output from the CPU 40 to the excitation phase switching circuit 41, and the CPU 40 as a control means Based on the control of the excitation phase switching circuit 41, the AND gates 50, 51, 52,
A signal is selectively output to one input terminal of 53. And each and gate 5
When a signal is input from the OR gate 54 to the other input terminal of 0 to 53, the AND gate 50 to 5
Actuation signals are selectively output to actuation circuits 55, 56, 57, and 58 of each phase of the electric motor 14 connected to the output terminals of the electric motor 14.

On the other hand, in this embodiment, a transmitter 59 as a means for generating a first actuation signal and frequency dividers 60 and 61 as a means for generating a second actuation signal are used to control the power supplied to the electric motor 14. and their output signals are the AND gate 6
2, 63, and 64, respectively, and the output signals of each AND gates 62 to 64 are input to the OR gate 54. During the transfer operation of the carriage 5, a signal is output from the CPU 40 to the other input terminal of the AND gate 62, and a high frequency operating signal having a predetermined width is sent from the oscillator 59 to each phase via the OR gate 54. is input to the operating circuits 55 to 58, and when the type carrying element 7 is selected and operated.
A signal is output from the CPU 40 to the AND gate 63, and a low frequency operating signal having a predetermined width t divided by the frequency divider 60 is sent to the operating circuit 55 of each phase.
58, and when the carriage 5 is at rest, the CPU 40 outputs a signal to the AND gate 64, and the lowest frequency operating signal having a predetermined width t is output from the frequency divider 61 to the operating circuits 55 to 58 of each phase.
58.

Each of the operating circuits 55 to 58 is provided with a transistor T as a switching means, as shown in FIG. T conducts and the motor 14
The stator windings L of each phase of the electric motor 14 are energized, so that the stator windings L of each phase of the motor 14 are excited based on the high frequency from the oscillator 5 when the carriage 5 is in operation. The electric motor 14 is driven to rotate by supplying a large electric power, a small electric power based on the type carrying frequency, and, when the carriage 5 is at rest, a minute electric power based on the lowest frequency from the frequency divider 61. Further, this embodiment is not suitable for driving the electric motor 14 using a single power source such as a battery.

Next, the operation of this embodiment will be explained.

Now, in this embodiment, when a print signal corresponding to a predetermined print character 7a is input based on a key operation on the keyboard, the solenoid 3 from the CPU 40
An activation signal is output to the solenoid 36, and the solenoid 36
is energized, whereby the selection member 32 is rotated to the movement blocking position shown by the chain line in FIG.

In this state, an activation signal is output from the CPU 40 to the AND gate 63 and the excitation phase switching circuit 41, and the electric motor 14 is rotated by a predetermined amount in an appropriate direction corresponding to the print signal using small electric power. As a result, the timing belt 12 is rotated, the type carrying element 7 is selectively rotated via the transmission gear 29 and the rotating shaft 6, and a predetermined type 7a is selectively arranged at a printing position corresponding to the platen 2.

Thereafter, an activation signal is output from the CPU 40 to the AND gate 64, and the electric motor 14 is held stationary by a small amount of holding power, and the type carrying element 7
is held in the selected position. CPU40 in this state
Based on the control, the solenoid 36 as the moving means is demagnetized, the selection member 32 is rotated to the rotating element position shown by the solid line in FIG. Become. At this time, the selection member 32 is rotated back below the ratchet wheel 31 in a vertical plane passing through the rotational axis of the ratchet wheel 31 under the action of the spring 35, so that the claw portion 32a of the ratchet wheel 31 Due to the positive engagement of the pawls, rotation of the type-carrying element 7 is immediately prevented.

In this state, an activation signal is output from the CPU 40 to the printing solenoid 21, and the solenoid 21 is temporarily excited. As a result, the hammer 17 is pushed counterclockwise in FIG. 5 via the armature 22, and printing is performed on the printing paper on the platen 2 via the ribbon 25.

After the printing operation is performed in this way, the CPU 40
An operating signal is output from the AND gate 62 and the excitation phase switching circuit 41, and the electric motor 14 is rotated by a predetermined amount in one direction with high electric power. As a result, the timing belt 12 is rotated, and the carriage 5 is moved to the right by one character pitch. In addition, when the rotation of the type carrying element 7 is inhibited, the excitation phase switching circuit 41 and the AND gate 6 are activated under the control of the CPU 40.
2, when the electric motor 14 is rotated in the other direction with high electric power, the carriage 5 is returned to its original position on the left.

Thereafter, holding power is supplied to the electric motor 14 and the carriage 5 is held until a key input is made on the keyboard.

It should be noted that the present invention is not limited to the configuration of the embodiment described above, and the configuration of each part can be arbitrarily changed without departing from the spirit of the invention.

Effects of the Invention As described in detail above, the present invention changes the frequency appropriately in accordance with the operation of the carriage and the selection of the type carrying element, and adjusts the amount of power supplied to the motor for each operation. It becomes possible to easily adjust the power to a high power or a low power that is suitable for the operation, and has an excellent effect of reducing the power consumption of the electric motor.

[Brief explanation of drawings]

FIG. 1 is a plan view of a printing machine showing an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is an enlarged cross-sectional view of the carriage portion, and FIG. 4 is an enlarged cross-sectional view of the carriage portion. FIG. 5 is an enlarged side view of the carriage, FIG. 6 is a block diagram showing an embodiment of the motor drive device, and FIG. 7 is a circuit diagram of its operating circuit. 1 is the machine frame, 2 is the platen, 5 is the carriage, 7
1 is a type carrying element, 7a is a type, 12 is a timing belt, 14 is an electric motor, 17 is a hammer, 25 is a ribbon, 31 is a ratchet wheel, 32 is a selection member as a selection means, 36 is a solenoid as a moving means, 4
0 is a CPU as a control means, 59 is an oscillator as a first operating signal generating means, 60 is a frequency divider as a second operating signal generating means, and T is a transistor as a switching means.

Claims (1)

[Scope of Claims] 1. A transfer operation in which a carriage 5 rotatably supports a type support element 7 having a large number of type characters 7a relative to a platen 2 mounted on a machine frame 1 along said platen 2; , a printing machine configured such that a selection operation of rotatably indexing the type character carrying element 7 to select a desired type character 7a is selectively performed in conjunction with one electric motor 14; a selection means 32 for selecting the operation, provided on the carriage 5 so as to be movable between a first position permitting execution of the transfer operation and a second position permitting execution of the transfer operation; a moving means 36 for moving the first actuating signal to the position or the second position; a first actuating signal generating means 59 for generating a high frequency actuating signal; a second actuating signal generating means 60 for generating a low frequency actuating signal; supplying large electric power to the electric motor 14 based on the actuation signal generated by the actuation signal generating means 59;
a switching means T for supplying a small amount of electric power to the electric motor 14 based on the actuation signal generated by the second actuation signal generating means 60; Signal generating means 60
generates a low frequency actuation signal to the moving means 3;
6. A printing machine characterized by comprising: a control means 40 for causing the first actuation signal generating means 59 to generate a high frequency actuation signal when the selection means 32 is moved to the second position by step 6.