JPH07409B2 - Ribbon switching device for printing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ribbon switching device for a printing machine.

2. Description of the Related Art Conventionally, a mounting plate that holds a cassette case containing a print ribbon and a collect ribbon is rotatably provided on a carrier, and the mounting plate is mounted on a lower home position of the carrier by an elevator motor mounted on the carrier. There are printing machines that switch to the printing position and the upper erasing position.

Normally, the mounting plate is located at the home position, and is rotated to the print position in response to a print command, and is rotated to the upper erasing position when erasing the character with the collect ribbon. The mounting plate is held at the print position when print commands are issued at regular intervals, but is returned to the home position when no print command is issued within a fixed period. This home position is the position where the printed characters are viewed. In the descending process of the mounting plate from the eraser position to the printing position, the feed claw provided on the carrier meshes with the ratchet wheel directly connected to the spool of the collect ribbon, so that the collect ribbon is fed by one-pitch.

Problems to be Solved by the Invention It is desirable that such an item is printed promptly when an operator operates a key, and not only erasing characters but also a ribbon such as red in a erasing position. Therefore, from the home position to the printing position or the erasing position, the switching speed of the mounting plate should be fast.

On the other hand, when a collect ribbon or a red ribbon is sent in the descending process of the mounting plate, it is necessary to obtain a large torque in the lift motor, and the descending speed of the mounting plate from the erasing position becomes slow. This has little influence on the use since the collect ribbon or the red ribbon is fed less frequently.

However, conventionally, the moving speed of the mounting plate is the same regardless of the range, and there is a problem that the speed becomes slower in operation if priority is given to feeding the collect ribbon and the like.

The present invention has been made in view of the above circumstances, and provides a ribbon switching device for a printing machine, which can increase the moving speed of the mounting plate and improve the operability in a range where ribbon feeding such as collect ribbon is not performed. With the goal.

Means for Solving the Problems The present invention relates to a carrier plate having a printing mechanism 6 and a ribbon feeding mechanism mounted on a carrier plate for holding a cassette case 11 in which a printing ribbon 10 fed by the ribbon feeding mechanism is stored.
12 is movably connected in a direction orthogonal to the moving direction of the carrier 3, and a lift motor 5 for moving the mounting plate 12 to a home position I, a printing position II and another operation position III is attached to the carrier 3, A spool 16 for holding both ends of a collect ribbon 15 or a ribbon of another color that is rarely used is rotatably attached to the mounting plate 12, and a ratchet wheel 17 is connected to one spool 16 and meshes with the ratchet wheel 17. Feeding claw 18
Is urged in the meshing direction and attached to the carrier 3 so that it can move back and forth.
A control means 24 for controlling the rotation speed of the lift motor 5 is provided.

Action The lift motor 5 switches the mounting plate 12 to one of the home position I, the printing position II, and the operation position III. In the process of lowering the mounting plate 12 from the operation position III to the printing position II, the collect ribbon 15 or a ribbon of another color is fed by the engagement of the ratchet wheel 17 and the feed pawl 18. The control means 24 controls the rotation speed of the lift motor 5,
In the process of lowering the placing plate 12 from the operation position III to the printing position II and feeding a ribbon such as a collect ribbon, the moving speed of the placing plate 12 is slowed down and the lift motor 5 is rotated with a required torque to load the ribbon. In the other descending sections and all ascending sections of the mounting plate 12, the moving speed of the mounting plate 12 is increased to shorten the operation time.

Embodiment An embodiment of the present invention will be described with reference to the drawings. A carrier 3 is slidably held on a shaft 2 parallel to the platen 1. A lift motor 5 for driving a gear 4 and a printing mechanism 6 are mounted on the carrier 3. The printing mechanism 6 includes a daisy wheel 7 driven by a wheel motor, which will be described later, and a printing hammer 9 driven by an electromagnet 8. Further, a mounting plate 12 for detachably holding a cassette case 11 accommodating an endless printing ribbon 10 is rotatably held on the carrier 3 about a shaft 13 as a fulcrum. Further, spools 16 for winding and holding both ends of the collect ribbon 15 are rotatably attached to the bearing pieces 14 provided on both sides of the mounting plate 12,
A ratchet wheel 17 is connected to one spool 16 so as to rotate integrally. The carrier 3 has feed claws that mesh with the ratchet wheel 17.
The spring 18 is biased counterclockwise by a spring 19 and is rotatably mounted on a shaft 20 as a fulcrum. At the edge of the bearing piece 14, a cam portion 14a that presses the projection 21 of the feed claw 18 while the mounting plate 12 descends from the printing position II to the home position I.
Are formed. Further, a fan gear 22 that meshes with the gear 4 with the shaft 13 as the center of radius and a locking piece 23 that elastically engages with the ratchet wheel 17 are attached to the mounting plate 12.

The control means 24 for the lift motor 5 is shown in FIG. That is, the CPU 25, ROM 26, RAM 27, programmable timer 28 and I / O port 29 are connected. The lift motor 5 is connected to the I / O port 29. RAM27 is A
Register 30, B register 31, C register 32 and D register
It has an area 33 and a U / D flag (up-down flag) 34. In addition, the ROM 26 has UP steps 1 and UP for controlling the rotation angle, angular velocity, and rotation direction of the lift motor 5.
The control software programs for speed 1, DOWN step 1, DOWN speed 1, DOWN speed 2, etc. are stored.

A carrier motor 35 for moving the carrier 3, a ribbon feed motor 36 mounted on the carrier 3 for feeding the print ribbon 10 (a component of the ribbon feed mechanism), a paper feed motor 37 for driving the platen 1, a wheel motor 38, The electromagnet 8 and the like are connected to the I / O port 29 to be controlled by the CPU 25.

In such a structure, first, the outline of the operation will be described with reference to the flow chart of FIG. After the power is turned on, the print routine is performed by operating the print key, the collection routine (erasure of erroneous printing) is performed by operating the collection key, and the operation key is operated when other keys are operated. A decision is made and processing corresponding to the function of the key is performed.

Next, the print routine will be described with reference to FIG.
When the print key is operated, the daisy wheel 7 is driven by the wheel motor 38 to rotate in the print RDY state,
The carrier 3 is driven by the carrier motor 35 to move to the print position. When the print signal is not continuously output, the mounting plate 12 is raised from the lowest home position I to the print position II. That is, the data of UP speed 1 is sent to the A register 30, and the UP step 1 is sent to the B register 31.
Will be sent. Since the D register 33 inputs the step when the mounting plate 12 is moved from the printing position II, no data is sent in this case. In the case of rising, the U / D flag 34 is set, the lift motor 5 rotates in the CW direction at a high angular velocity of ω ₁ , and the mounting plate 12 moves up to the printing position II. Next, the wheel motor 38, the carrier motor 35,
When the ribbon feed motor 36 and the lift motor 5 are in the RDY state, the printing hammer 9 is driven by the electromagnet 8 to print. When the operation of the print hammer 9 is completed, the data of DOWN speed 1 is sent to the A register 30 and the B register
The data of DOWN step 1 is sent to 31, and the U / D flag 34 is reset because it is descending, the lift motor 5 rotates in the CCW direction at a high angular velocity of ω ₃ , and the mounting plate 12 moves to the home position I. Then, the print routine ends.

Next, the lifting operation of the mounting plate 12 will be described with reference to the flow chart of FIG. UP speed 1, DOWN in A register 30
Data of speed 1 or 2 is sent, but the contents of the A register 30 is set in the programmable timer 28,
If the programmable timer 28 starts and the U / D flag is set, the lift motor 5 rotates in the CW direction, and U / D
If the D flag 34 is reset, the lift motor 5 is CCW.
Rotate in the direction, Home Position I and Print Position II
And the mounting plate 12 ascends or descends until time is up. Each time, the number of steps in the B register 31 is reduced. Even if the step of B register 31 is zero,
Whether the D register 33 is stepped or not is judged, and if there is, the contents of the C register 32 are set in the programmable timer 28. The contents of the C register 32 are data such as UP speed 1 and DOWN speed 1. When the programmable timer 28 starts, if the U / D flag is set, the lift motor 5 rotates in the CW direction, and if the U / D flag 34 is reset, the lift motor 5 rotates in the CCW direction and the print position. The mounting plate 12 rises or descends between II and the operation position III until the mounting plate 12 time-up. Each time, the number of steps in the D register 33 is reduced. The operation ends when the step of the D register 33 reaches zero.

Next, the collection routine will be described with reference to the flow chart of FIG. When you operate the collection key,
In the print RDY state, the daisy wheel 7 is driven by the wheel motor 38 to rotate, and the carrier 3 is driven by the carrier motor 35 to move to the erased position, and the A register 30 is displayed.
The data of UP speed 1 is sent, the data of UP step 1 is sent to the B register 31, the data of UP speed 1 is sent to the C register 32, and the UP step 1 is sent to the D register 33.
Data is sent, the U / D flag 34 is set, the lift motor 5 rotates in the CW direction at a high angular velocity, and the mounting plate 12 rises to the erasing position III. Next, the wheel motor 3
8, the carrier motor 35, the ribbon feed motor 36, and the lift motor 5 are in the RDY state, and the printing hammer 9 is driven by the electromagnet 8 to erase the character. When the operation of the print hammer 9 is completed, the data of DOWN speed 2 is sent to the A register 30, the data of DOWN step 1 is sent to the B register 31, the data of DOWN speed 1 is sent to the C register 32, and the D register is sent. Data of DOWN step 1 is sent to 33, U / D flag 34 is reset, and lift motor 5 is CCW.
And the mounting plate 12 descends from the operation position III to the home position I or the printing position II, and the collection routine ends.

In the collection routine, the operations of the positions I to II of the mounting plate 12 are controlled by the contents of the A register 30 and the B register 31, and the positions II to II of the mounting plate 12 are controlled by the contents of the C register 32 and the D register 33. Controls the operation in section III. When erasing characters continuously, the placing plate 12 is moved up and down between the printing position II and the operating position III, and one erasing operation is performed between the home position I and the operating position III. Raise and lower 12.

In the present embodiment, the angular velocity of the lift motor 5 when the mounting plate 12 rises from the home position I to the printing position II is ω ₁ , and when the mounting plate 12 rises from the printing position II to the operating position III. The angular velocity of the lift motor 5 is set to ω ₂ ,
The angular velocity of the lift motor 5 when the mounting plate 12 descends from the print position II to the home position I is ω ₃ , and the angular velocity of the lift motor 5 when the mounting plate 12 descends from the operation position III to the printing position II. As ω ₄ , the relationship of ω ₁ > ω ₂ , ω ₁ > ω ₃ , ω ₂ > ω ₄ <ω ₃ is defined.

Therefore, in the process of lowering the mounting plate 12 from the position III to the position II, the load is large because the collect ribbon 15 is fed or the feed claw 18 is retracted from the ratchet wheel 17 by the bearing piece 14, but the lift motor 5 has an angular velocity. Since ω ₄ is low, it is convenient to obtain a large torque. Since the angular velocity of the lift motor 5 in the descending section from the position II to I and the ascending section from the position I to II or III is high, high speed printing is performed.
Operability can be improved. Especially from Position I
The angular velocity ω ₁ of the lift motor 5 in the ascending section to II is the fastest, and it is possible to effectively reduce the frequent printing operation time.

It should be noted that the present invention also includes a ribbon which is used infrequently, such as red, instead of the collect ribbon 15.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the operation position III to the printing position II within the range of feeding the ribbon such as the collect ribbon by the operation of the control means when the position of the mounting plate is switched by the lift motor. It is possible to increase the torque of the lift motor by slowing down the descending speed of the mounting plate up to, and to speed up the moving speed of the mounting plate and perform high-speed printing in other descending sections and all ascending sections of the mounting plate. It is possible to improve the operability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view, FIG. 2 is a block diagram, FIG. 3 is a general flow chart, and FIG. 4 is a print routine. Flow chart, FIG. 5 is a flow chart showing the lifting operation of the mounting plate,
FIG. 6 is a flow chart showing a collection routine. 3 ... Carrier, 5 ... Lift motor, 6 ... Printing mechanism, 10 ... Printing ribbon, 11 ... Cassette case, 12 ...
Mounting plate, 15 ... Collect ribbon, 16 ... Spool, 17 ...
... Claw wheel, 18 ... Feed claw, 24 ... Control means, 36 ... Ribbon feed motor (a component of the ribbon feed mechanism), I ... Home position, II ... Printing position, III ... Operation position

Claims (1)

[Claims] 1. A carrier plate having a printing mechanism and a ribbon feeding mechanism mounted thereon, and a mounting plate for holding a cassette case accommodating a printing ribbon fed by the ribbon feeding mechanism in a direction orthogonal to the moving direction of the carrier. Movably connected to the home plate I and the printing position
II and another operation position III, a lift motor is attached to the carrier, and a spool that holds both ends of a collect ribbon or a ribbon of another color that is rarely used is rotatably attached to the mounting plate. When the ratchet wheel is connected to the spool, and the feed claw that meshes with the ratchet wheel is urged in the meshing direction so as to move back and forth in the carrier, and the mounting plate rises from the home position I to the printing position II. The angular velocity of the lift motor is ω ₁ , the angular velocity of the lift motor when the mounting plate is raised from the printing position II to the operating position III is ω ₂ , the mounting plate is from the printing position II to the home position The angular velocity of the lift motor when descending to I is ω ₃ , and the angular velocity of the lift motor when the mounting plate descends from the operation position III to the printing position II. Is defined as ω ₄ , and a relationship of ω ₁ ≧ ω ₂ , ω ₁ ≧ ω ₃ , ω ₂ > ω ₄ <ω ₃ is established.