JPH02231177A - Typewriter with correction function - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a printing error at the time of an initial printing by a method wherein a switch for detecting an origin point of a carriage is used when a power source is cut during a correction printing action and a normal printing action is conducted by again throwing the power source in. CONSTITUTION:A ribbon lift cam 12 is rotatably supported by a shaft 11 provided on a carriage 5. On one side surface of the cam 12, a groove cam 13 provided with a small-diameter part 13a and a large-diameter part 13b is formed. On the other hand, a follower pin 6a engaging with the groove cam 13 is projected on a ribbon holder 6. When the follower pin 6a is engaged with the small-diameter part 13a, the ribbon holder 6 is disposed on a first lift position where a printing ribbon 8a is opposed to a platen 2. When the follower pin 6a is engaged with the large-diameter part 13b, it is disposed on a second lift position where a correction ribbon 9 is opposed to the platen 2. Because the lift position of the ribbon holder 6 is identified before the start of a printing action to be correctly the position where the printing ribbon 8a is opposed to the platen 2, the occurrence of a printing error firstly can be prevented even when a power source is cut during a correction printing action and a normal printing action is conducted by again throwing the power source in.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention includes a carriage on which a print head and a print ribbon are placed and movable along a platen, and a correction ribbon displaceably supported by the carriage. The present invention relates to a typewriter having a collection function and a holder for holding a typewriter.

[Prior art]

Conventionally, this type of typewriter uses a ribbon lift cam rotated by a drive motor to swing a ribbon holder held in a carriage so that the printing ribbon and correction ribbon on the ribbon holder face the platen. There is one that can be selectively placed in a certain position. In addition, the printing ribbon is always placed in the use position facing the platen, and during correction, the drive motor rotates the ribbon lift cam and swings the ribbon holder held in the carriage, so that the correction ribbon supported by the ribbon holder is rotated by the drive motor. Some printers are arranged between the printing ribbon and the platen.

[Problems to be Solved by the Invention] However, in conventional typewriters, if the power is cut off during the correction printing operation using the correction ribbon and the power supply to the motor is stopped, the correction ribbon remains in the use position. Therefore, when the power is turned on again and a normal printing operation is started, the printing operation using the correction ribbon is executed first, which causes a problem in that printing is not performed.

Further, in order to solve this problem, it is possible to provide a dedicated detector for detecting the position of the correction ribbon, but this increases the number of parts and increases the manufacturing cost.

[Purpose of the Invention] This invention was made to solve the above-mentioned problems, and its purpose is to solve the problem when the power is turned off during the correction printing operation, and then the power is turned on again and the normal printing operation is resumed. By using a switch for detecting the origin of the carriage, it is possible to prevent printing errors from occurring during the first printing even when attempting to print, and we provide an inexpensive typewriter with a correction function. It's about doing.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a carriage on which a print head and a print ribbon are placed and movable along a platen, and a carriage that is movably supported by the carriage. and a holder for holding a correction ribbon, in which the correction ribbon is displaced between an erase position facing the platen and a rest position located below the erase position. a ribbon displacing means having a cam member for displacing the holder, one switch member installed on the carriage, and a switch member that engages with the cam member to detect the rotational position of the cam member; a first actuator member installed on the carriage for activating the member; and a first actuator member tJ2 fixed at a position corresponding to the origin position of the carriage and activating the switch member when the carriage is located at the origin position. an actuator member, a first moving means for moving the carriage in a direction away from the origin position by a predetermined amount if the switch member is in an activated state when the power is turned on; and after the carriage is moved by the first moving means, the switch The apparatus is characterized by comprising a determining means for determining whether or not the member is in an operating state.

[Function] When the typewriter is powered on, if one switch member is activated, the first moving means moves the carriage a predetermined amount away from the origin position, and the second actuator member To be able to reliably separate from a switch member. Then, the determining means determines whether the switch member is in an operating state. That is, the rotational position of the cam member that displaces the holder holding the correction ribbon is detected. This allows the position of the correction ribbon to be detected when the power is turned on.

[Examples] Examples that embody the present invention will be described in detail below with reference to the drawings.

A platen 2 is rotatably supported on a frame 1 of the typewriter, and a guide shaft 3 and a guide rail 4 extending parallel to the platen 2 are installed. A carriage 5 is supported on the guide shaft 3 and the guide rail 4 so as to be movable along the platen 2, and is driven by a carriage drive motor 37 (see FIG. 1) comprising a step motor.

A ribbon holder 6 is swingably supported on the upper part of the carriage 5 by a support shaft 7. A ribbon cassette 8 containing a printing ribbon 8a is mounted on the ribbon holder 6, and a portion of the printing ribbon 8a is exposed so as to be able to run along the platen 2. On both sides of the ribbon holder 6, a supply sboule 10 wound with an unused correction ribbon 9 and a winding sboule (not shown) for winding up the used correction ribbon 9 are rotatably supported. The running portion of the correction ribbon 9 in is arranged below the exposed portion of the printing ribbon 8a.

As shown in FIGS. 2 and 3, a ribbon lift cam 12 is rotatably supported on a shaft 11 installed on the carriage 5, and a small diameter portion 13 is provided on the side surface of the ribbon lift cam 12.
A grooved cam 13 is formed having a large diameter portion 13b and a large diameter portion 13b. On the other hand, the ribbon holder 6 is provided with a protruding follower pin 6a that engages with the grooved cam 13. When the follower pin 6a is engaged with the small diameter portion 13a as shown in FIG. Print ribbon 8a is placed in a first lift position opposite platen 2. Further, as shown in FIG. 4, when the follower pin 6a is engaged with the large diameter portion 13b, the correction ribbon 9
a is placed in a second lift position facing the platen 2.

A petal type type wheel 14 having a large number of type elements 14a on its outer periphery is disposed on a carriage 5 close to the platen 2, and a type selection motor 15 (see Fig. 1) is operated at the center of the petal type type wheel 14.
The motor shaft 15a is connected to the motor shaft 15a. As the type selection motor 15 rotates, one type element 14a is selectively placed at a printing position facing the platen 2. By hitting the character element 14a with a printing hammer (not shown), characters are printed on the printing paper on the platen 2 by the printing ribbon 8a, and erroneously printed characters are erased by the correction ribbon 9.

A swinging gear 18 is rotatably supported on the shaft 11, and is rotated via a gear transmission mechanism 17 by a DC motor 16 for performing a ribbon lifting operation and a type striking operation by a printing hammer. Further, a clutch collar 19 is mounted on the shaft 11 and constitutes a clutch mechanism for transmitting or blocking the rotation of the wave gear 18 to the ribbon lift cam 12. A pair of locking protrusions 1 protrude at equal angular intervals on the outer periphery of the clutch collar 19.
9a and 19b are provided. Each locking protrusion ILa, 1
When the rotation of the clutch collar 19 is restrained via the clutch collar 9b, the wave gear 18 and the ribbon lift cam 12 are
Drive transmission is cut off. Also, clutch color 19
When the rotation of the wave gear 18 is not restrained, the rotation of the wave gear 18 is transmitted to the ribbon lift cam 12 by the action of the clutch spring, and the ribbon lift cam 12 is rotated clockwise in FIG. 2.

A collection trigger solenoid 20 is mounted on the carriage 5 below the left side of the ribbon lift cam 12. Further, an armature 21 is rotatably supported near the solenoid 20, and is urged to rotate clockwise in FIG. 2 by a spring 22. Then, when the armature 21 is attracted against the biasing force of the spring 22 by energizing the solenoid 20, the bent end portion of the armature 21 is bent at each of the locking protrusions 19a. When the armature 21 moves outward according to the rotation locus of the locking protrusions 19b and the energization to the solenoid 20 is stopped, the armature 21 moves into the rotation locus of the locking protrusions 19a and 19b due to the biasing force of the spring 22, and each locking It can be engaged with the stop projections 19a and 19b.

A half-moon-shaped operating cam piece 23 is integrally formed on the outer periphery of the ribbon lift cam 12 and protrudes from the outer periphery of the ribbon lift cam 12. At the lower right side of the ribbon lift cam 12, a leaf switch (hereinafter referred to as 24 (referred to as a switch) is installed. Between the ribbon lift cam 12 and the switch 24, an approximately L-shaped actuating piece 25 is rotatably supported by a shaft 26 at its intermediate portion, and one arm 25a is connected to the outer periphery of the actuating cam piece 23. is biased to rotate in the direction of engagement. Based on the engagement with the actuating cam piece 23, the actuating piece 25 is reciprocated between the inoperative position shown in FIG. 2 and the actuating position shown in FIG. The other arm 25b opens and closes the contacts 24a of the switch 24, and the switch 24
is operated on and off.

On the other hand, as shown in FIG. 3, on the movement trajectory of the carriage 5, an engaging body 27, which has an inclined surface 27a on the side wall of the frame 1 to which the other arm 25a of the actuating piece 25 can engage and disengage, moves inward. It is installed protrudingly. And carriage 5
is moved to the left end of the movement range, the other arm 25b of the actuating piece 25 engages with the inclined surface 27a of the engaging body 27, so that the actuating piece 25 moves along the inclined surface 27a to the second position.
It is rotated from the non-operating position shown in the figure to the operating position shown in FIG. 4, and the switch 24 is turned on accordingly.

Next, the electrical configuration of the typewriter in this embodiment will be explained with reference to FIG.
(Central processing unit) 30 includes a ROM that stores various control programs as shown in the flowchart of FIG.
(read only memory) 31 and RAM (random access memory) 32 are connected. As various keys on the keyboard 33 are operated, various control signals are input to the CPU 30, and based on these various control signals, the CPU 30 controls the motor drivers 34, 35, 36,
and controls the operation of the carriage drive motor 37 , DC motor 16 , type selection motor 15 and solenoid 20 via the solenoid driver 38 .

Further, a predetermined detection signal is inputted to the CPU 30 from the switch 24 .

Next, the operation of the typewriter in this embodiment will be explained according to the flowchart shown in FIG.

First, when the typewriter is powered on, a ribbon lift position detection operation (a ribbon lift cam position detection operation) is first performed. That is, the CPU 30 determines the on/off state of the switch 24 in step Sl (hereinafter simply referred to as S1; the same applies to other steps). If the determination result is YES, that is, if it is in the on state, then in the next step 82, the carriage drive motor 37 is driven to drive the carriage 5.
Move 40 steps to the right. As a result, even if the carriage 5 is located at the left end of the frame, the actuating piece 25 on the carriage 5 will not move the engaging member 25 on the frame 1.
6, and the subsequent on/off state of the switch 24 is determined only by the engagement state between the actuating cam piece 23 and the actuating piece 25.

Subsequently, in S3, the CPU 30 again determines the on/off state of the switch 24. In the on state, as shown in FIG. 4, the actuating piece 25 engages with the actuating cam piece 23 to turn on the switch 24, and the ribbon holder 6 is placed in the second lift position. This means that

Therefore, after driving the DC motor 16 in S4, the CPU 30 outputs a trigger pulse to the collection trigger solenoid 20 for a predetermined period of time in S5. Next, the process advances to S6, and the driving of the DC motor 16 is stopped.

That is, when the solenoid 20 is energized, the armature 21 is attracted as is clear from FIG. 4, and its tip is separated from one of the locking projections 19a of the clutch collar 19. Then, the rotation of the driven gear 18 is transmitted to the ribbon lift cam 12 by the clutch mechanism including the clutch collar 19, and the cam 12 begins to rotate clockwise in FIG. 4.

Before the other locking protrusion 19b of the clutch collar 19 faces the tip of the armature 21, the solenoid 20
energization is stopped, and the tip of the armature 21 is moved into the rotation locus of the other locking protrusion 19b. As the clutch collar 19 continues to rotate, the other locking protrusion 19b engages with the armature 21 as shown in FIG.
2 is stopped after half a rotation.

As the ribbon lift cam 12 rotates, the ribbon holder 6 is lowered from the second lift position shown in FIG. 4 to the first lift position shown in FIG. , a printing ribbon 8a is arranged facing the platen 2.

Next, the CPU 30 again determines the on/off state of the switch 24 in S7, and if it is in the off state, predetermined error processing such as buzzer operation is performed in S8. on the other hand,
S7 and the Sl. If the determination result in S3 is NO, that is, when the switch 24 is in the OFF state, the ribbon lift position detection operation is ended and the process advances to the next step 89 to perform the carriage origin position detection operation.

In S9, the CPU 30 starts driving the carriage drive motor 37. Then, in SIO to S12, it is determined whether the switch 24 is turned on every time the carriage drive motor 37 is driven by four steps. That is, as shown in FIG. 2, with the ribbon holder 6 placed at the first lift position and the switch 24 turned off, the carriage 5 is moved to the left by four steps by the carriage drive motor 37. When the other arm portion 25b of the actuating piece 25 engages with the inclined surface 27a of the engaging body 27, the actuating piece 25 is rotated clockwise in the figure. As a result, the switch 24 is turned on, similar to when the ribbon holder 6 is placed in the second lift position. And CPU30 is 8
When it is determined that the ON signal has been input from the switch 24 consecutively, the drive of the carriage drive motor 37 is stopped, the carriage 5 is placed and held at the origin position, and the carriage origin position detection operation is completed.

Note that during this operation, after the leftward movement of the carriage 3 is restricted by the frame 1, the carriage drive motor 37 is out of step. On the other hand, when the determination result in S12 does not become YES even if the carriage drive motor 37 is driven by 1300 steps corresponding to the entire movement range of the carriage 5, the CPU 30 performs predetermined error processing in S13.

On the other hand, when the determination result of S12 becomes YES, CPU3
0 stops the drive of the carriage drive motor 37 at the next step 514. Then, the CPU 30 performs a predetermined type wheel origin detection operation in S15, and then moves the carriage 5 to the printing start position in 816. Therefore, the operator can immediately start the normal printing operation by operating the keys on the keyboard 33, and there is no risk of using the correction ribbon 9 by mistake when starting printing.

As mentioned above, before the start of the printing operation, the lift position of the ribbon holder 6 is confirmed and the printing ribbon 8a is always placed in a position facing the Latin 2, so the power is turned off during the correction printing operation and then the ribbon holder 6 is lifted again. Even when the power is turned on and a normal printing operation is attempted, it is possible to prevent a printing error from occurring at the beginning. In addition, since the switch 24 for detecting the lift position of the ribbon holder 6 can also detect the origin of the carriage 3, there is no need to separately install a switch exclusively for detecting the origin of the carriage, reducing the number of parts and reducing costs. can be manufactured.

Note that this invention is not limited to the above embodiments,
For example, when a switch that is turned on and off directly by engagement with the ribbon holder 6 is attached to the carriage 5, the configuration of each part can be arbitrarily changed without departing from the spirit of the present invention.

[Effects of the Invention] As detailed above, the present invention eliminates the risk of a printing error occurring at the beginning even if the power is turned off during a correction printing operation and the power is turned on again to perform a normal printing operation. can be prevented.

In addition, since a switch for detecting the carriage origin is used without providing a special switch member to detect the position of the correction ribbon, the number of parts can be reduced and manufacturing can be done at low cost. The effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the electrical configuration of a typewriter embodying the present invention, Fig. 2 is a partial side sectional view of the typewriter during correction printing operation, and Fig. 3 is a partial plane view when detecting the origin of the carriage. 4 is a partial side sectional view of the carriage during normal printing operation, and FIG. 5 is a flowchart. In the figure, 2 is a platen, 5 is a carriage, 6 is a ribbon holder, 8a is a print ribbon, 9 is a correction ribbon, 12 is a ribbon lift cam, 16 is a DC motor, 23 is an operating cam piece, 24 is a leaf switch, and 25 is a Actuation piece, 25a. 2
5b is an arm, 27 is an engaging body, and 30 is a CPU.

Claims (1)

[Claims] 1. A collection function comprising a carriage on which a print head and a print ribbon are placed and movable along a platen, and a holder movably supported by the carriage and holding a correction ribbon. A typewriter having a cam member for displacing the holder in order to displace the correction ribbon between an erase position facing the platen and a rest position located below the erase position. means; a switch member mounted on said carriage; a switch member mounted on said carriage for engaging said cam member and activating said switch member for detecting the rotational position of said cam member; a first actuator member, fixed at a position corresponding to the origin position of the carriage;
a second actuator member that activates the switch member when the carriage is located at its home position; and a second actuator member that moves the carriage a predetermined amount away from the home position when the switch member is activated when the power is turned on; A collection comprising: a first moving means for moving the carriage in the direction; and a determining means for determining whether the switch member is in an activated state after the first moving means moves the carriage. A typewriter with functions. 2. The first and second actuator members are composed of one double-arm member, which is rotatable around the center thereof, and one arm is rotated in the direction in which it abuts the peripheral edge of the cam member. When the carriage is at the home position, the other arm is rotated by a protruding piece provided on the typewriter body, and either one of the arms is
2. A typewriter having a collection function according to claim 1, wherein the typewriter engages with the switch member to put the switch member into an operating state.