JPH035996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for carrying out periodic carry steps;
The present invention relates to a carriage transfer/paper feeding mechanism for a serial printer in which paper is fed at the same time as a carriage is returned from an arbitrary digit position.

Carriages in conventional serial printers are carried up and returned by using a step motor to rotate the timing belt that fixes the carriage in the forward or reverse direction, or by fixing a rope fixed to the carriage to a pulley with a ratchet.
There is a method in which the rope is wound up and carried up by a ratchet mechanism using a plunger, the anti-reverse claw is removed from the ratchet by another plunger, and the carriage is returned to its original position by a spring. The method of forward or reverse rotation of a step motor is expensive due to the timing belt, step motor, etc. Furthermore, if the step motor is made smaller, the starting torque is small and responsiveness becomes poor, and the current must be increased. There were other drawbacks.
The method using a plunger also has the disadvantage that it requires a large amount of current and is more expensive because it requires two plungers. Regarding paper feeding, the method using a step motor has the disadvantage of being expensive, and the method using a plunger also has the disadvantage of requiring a high current. In either case, separate power was required for transporting the carriage and for feeding the paper, expensive parts and high current were required, and furthermore, it was difficult to reduce the size and weight.

The present invention eliminates or improves these drawbacks, and aims to make it possible to drive carriage transport and paper feed by switching the only power source using gears.

The gist of the present invention is to provide a first driven vehicle that operates a carriage carry-up transfer means, a second driven vehicle that operates a carriage return transfer device and a paper feeding device, and a first driven vehicle and a second driven vehicle that operate a carriage return transfer device and a paper feeding device. a motive vehicle that drives the motive vehicle and the second driven vehicle; a sliding means that slides the motive vehicle in the thrust direction; and a control means that controls sliding of the motive vehicle in the thrust direction. The sliding means includes a sliding spring that pushes the prime mover in the thrust direction, and a sliding cam that pushes the prime mover back in the thrust direction against the sliding spring. a lever that engages with the motive vehicle; a lever spring that urges the lever to a position where it engages with the motive vehicle; and a lever that is removed from the position where it engages with the motive vehicle against the biasing force of the lever spring. and an electromagnet, and by sliding the prime mover in a thrust direction by the control means and the sliding means, the drive by the prime mover can be switched between the first driven wheel and the second driven wheel. This is a carriage transfer/paper feeding mechanism for a small serial printer.

The present invention will be described in detail with reference to examples. 1 to 6 are prepared as an explanation of an embodiment for effectively utilizing the features of the present invention.

FIG. 1 is a sectional view of the printer of the present invention. FIG. 2 is a perspective view of the carriage.
FIG. 3 is a schematic cross-sectional plan view. FIG. 4 is a side view of the present invention. FIG. 5 is a detailed diagram of the gear. FIG. 6 is a detailed plan view of the gear. A type wheel 12 is supported by a shaft 13 and connected to an ink roller 14, and serves as a guide for the recording paper 32 together with a paper guide 16. 17 is a carriage, shafts 19, 27
The only hammer 18 and trigger lever 23 are inserted, and it is slidable along shafts 19 and 27 in the thrust direction of the type wheel 12 (in the direction of arrows A and B). The shaft 19 serves as a guide for the carriage 17 and as a paper feed roller 54, which will be described later.
is fixed to it and also functions as a paper feeder. Reference numeral 20 denotes a paper press roller, which is constantly pressed against the paper feed roller 54 side by a spring member 21. 22 connects the hammer 18 to the type wheel 12 via the trigger lever 23.
It is a ratchet wheel that flies to the side. 28 is hammer 18
This is a positioning plate for accurately positioning a character at a position corresponding to the type on the type wheel 12, and has triangular teeth 281 developed in a plane, and the engaging portion 17 of the carriage 17.
1, the carriage 17 is returned to the home position by the return spring 49. 30 is an electromagnet for a printing trigger, and 31 is a suction plate spring. 33 is a motor, 34 is a motor gear, 35 is a motor shaft, 36 is a transmission gear, 37 is a ratchet gear, 38 is a reduction gear, and 39 is a type gear. 40 is a return electromagnet, and a return lever 41
When the return lever is brought close to the suction surface of the return electromagnet 40 by the other cam portion 454 of the switching gear 45, the return lever is energized and biases the return lever 41 clockwise to the engagement position with the switching gear 45. spring 56
The return lever 41 is operated against the
Disengage from 5. 42 is a carry gear, and code 4 has one end attached to a part of the carriage 17.
3 and slide the carriage 17 in the direction of arrow A. 44 is a carry transmission gear.
47 and 48 are frames. A return spring 49 has one end attached to the frame and the other end attached to the carriage 17, and returns the carriage 17 to the home position (standby position). 50 is a paper feed transmission gear, which has a cam portion 501;
1 and the tip 521 of the release lever 52 engage, the release lever 52 is actuated and the transmission lever 53 is activated.
is operated to disengage the coaxial positioning plate 28 from the carriage 17. 51 is a paper feed gear. A sliding cam 57 has a first cam surface 571 and a second cam surface, and is further fixed to the frame 47 as a bearing for the shaft 13.

The spring 46 biases the switching gear 45 in the direction of arrow C, and the cam portion 453 of the switching gear 45 is moved to the sliding cam 57.
The first cam surface 571 or the second cam surface 572 is pressed.

When the second cam surface 572 of the switching gear 45 comes into contact with the cam portion 453, the switching gear 45 is positioned in the state shown in FIG. 451 and the carry special gear part 441 of the carry transmission gear 44 are also connected to the switching gear 4.
5's second digit special tooth 452a and paper feed transmission gear 5
0 second special gear part 502b is further positioned such that the third special tooth part 452b of the switching gear 45 and the second special gear part 502b of the paper feed transmission gear 50 can mesh with each other, , switching gear 4
A gap E is created between the return lever 41 and the return lever 41.

Further, when the first cam surface 571 of the switching gear 45 comes into contact with the cam portion 453, the switching gear 45
1st carry special tooth 451 and carry transmission gear 44
Also, the second special gear part 452a of the switching gear 45, the first special gear parts 502a, 502c, and the second special gear part 502b of the paper feed transmission gear 50, Further, the third special tooth portion 452b of the switching gear 45 can mesh with the second special tooth portion 502b of the paper feed transmission gear 50. Further, the other cam portion 454 of the switching gear 45 pushes up the tip 412 of the return lever 41 in synchronization with the position of a second cam surface 572 of the sliding cam 57, which will be described later.
Place the return lever 41 on the absorption surface 401 of the return electromagnet 40.
be close to. While the return lever 41 and the switching gear 45 are engaged, the first carry special tooth 451 of the switching gear 45 and the carry transmission special gear portion 441 of the carry transmission gear 44 are engaged in the thrust direction position. Therefore, carry is possible, and the switching gear 45
The second special tooth portion 452a of the paper feed transmission gear 5
Since it cannot mesh with the first special gear portion 502a or 502c of No. 0 in the thrust direction position, the paper feed transmission gear 50 cannot start rotating. However, since the second special gear part 452a and the third special gear part 452b of the switching gear 45 and the second special gear part 502b of the paper feed transmission gear 50 can always mesh in the thrust direction position, the paper The transmission gear 50 includes second and third special gear parts 452a of the switching gear 45,
While the second special gear part 502b of the paper feed transmission gear 50 is within the rotation locus of the paper feed transmission gear 452b, the rotation continues, and the first special gear part 50 of the paper feed transmission gear 50
Rotation automatically stops when 2a or 502c is positioned. That is, once the second special tooth 452a of the switching gear 45 and the first special gear portion 502a or 502c of the paper feed transmission gear 50 mesh with each other in the thrust direction position, the paper feed transmission gear 50 and the switching gear 45 engage with each other. The presence or absence of engagement with the return lever 41 and the first cam surface 571 and second cam surface 57 of the sliding cam 57
Regardless of the position of 2, the first special gear portion 502a or 502c of the paper feed transmission gear 50 is always
are the second and third special gear parts 452 of the switching gear 45
a, 452b until it is located within the locus.

Next, the operation and explanation of the printer will be explained using FIGS. 1 to 6.

First, the carriage carry operation will be explained. Due to the rotation of the motor 33, the motor gear 34,
The type wheel 12 rotates via a transmission gear 36, a pawl gear 37, a reduction gear 38, and a type wheel gear 39. Simultaneously with the rotation of the type wheel 12, the tip 412 of the return lever 41 is engaged with the switching gear 45 coaxially on the shaft 13 due to the clockwise biasing force of the return lever spring 56. The carry special tooth 451 of No. 1 meshes with the carry transmission special gear portion 441 of the carry transmission gear 44, and causes the carry gear 42 to rotate intermittently. This intermittent rotation of the carry gear 42 is caused by a cord 43 attached to a part of the carriage 17.
is wound around the pulley portion 421 of the carry gear 42 to a size slightly larger than the pitch P between the girders, and then released. Therefore, the carriage 17 guided on the shafts 19, 27
resists the spring force of the return spring 49, moves in the direction of arrow A by a step slightly larger than the inter-digit pitch P, and then retreats in the direction of arrow B. This retreat in the direction of arrow B is caused by the engagement portion 171 of the carriage
It engages with triangular teeth 281 and stops. Correct position of the hammer 18 relative to the type wheel 12 is therefore ensured. Next, the printing operation will be explained. To print desired characters on the type wheel 12 being rotated by the motor 33, a trigger signal is applied to the electromagnet 30 to attract the suction plate 29. Due to the operation of the suction plate 29 attracted by the electromagnet 30, the trigger lever actuation plate 25 fixed to the trigger actuation shaft 26 engages with the suction plate 29 via the engaging portion 251.
Rotate the trigger actuation shaft 26 counterclockwise.
By rotating the trigger actuation shaft 26 in the counterclockwise direction, the trigger transmission member 24 is transferred to the trigger actuation shaft 2.
6, the trigger lever 2 is similarly rotated counterclockwise and is attached to one end of the trigger transmission member 24.
3 is driven, and the tip 23 of the trigger lever 23
1 is inserted into the rotation locus of the claw portion 221 of the ratchet wheel 22. The pawl portion 221 of the ratchet wheel 22 strikes the tip portion 231 of the trigger lever 23, thereby causing the hammer 18 to fly to a desired printing surface to print. When a single digit has been printed and a carry is to be carried out, the cord 43 attached to one end of the carriage 17 is connected to the pulley portion of the carry gear 42, as described above.
21, the carriage 17 is carried up in the direction of the arrow A along the shafts 19, 27 together with the trigger transmission member 24 to which the hammer 18 and the trigger lever 23 are attached. When the type characters on the type wheel 12 come to face the hammer 18, they are successively printed by the above-described operation.

Next, paper feed and carriage return will be explained. The tip 412 of the return lever 41 is rotated counterclockwise by the other cam portion 454 of the switching gear 45, and the return lever 41 is brought close to the suction surface 401 of the return electromagnet 40, and the second end of the sliding cam 57 is rotated counterclockwise. When a gap E is created between the switching gear 45 and the return lever 41 due to the cam surface 572, when the return electromagnet 40 is energized, the return lever 41 operates in the direction of arrow D against the return lever spring 56, and the switching gear 4
5 is disengaged. Then, when the cam portion 453 of the switching gear 45 passes the second cam surface 572 of the sliding cam 57 and comes onto the first cam surface 571, the switching gear 45
5 slides in the direction of arrow C by the spring 46, the first special carry tooth 451 and the special carry transmission gear part 441 disengage from each other in the thrust direction position, and now the second special gear of the switching gear 45 The tooth portion 452a meshes with the first special gear portion 502a of the paper feed transmission gear 50. Therefore, the power of the motor 33 is transmitted to the paper feed transmission gear 50 through the second special tooth section 452a and the third special gear section 452b of the switching gear 45.
special gear part 502a and second special gear part 502
b, the shaft 19 is intermittently rotated via the special gear part 511 of the paper feed gear 51 fixed to the shaft 19 by the third special tooth 504 of the paper feed transmission gear 50, and the paper feed on the same axis The recording paper 32 is fed by the roller 54. On the other hand, the cam part 501 of the paper feed transmission gear 50 and the end part 521 of the release lever 52 are engaged, and the release lever 52 is rotated counterclockwise, and the release lever 52 is attached to the shaft 27 coaxially with the positioning plate 28. By rotating the transmission lever 53 clockwise against the positioning spring 55 applying a counterclockwise biasing force to the transmission lever 53, the triangular teeth 281 of the positioning plate 28 and the engaging portion 171 of the carriage 17 are connected. is disengaged, and the carriage 17 moves in the direction of arrow B and returns to the home position. Furthermore, on the other hand, the other end 411 of the return lever 41 and the second cam portion 503 of the paper feed transmission gear 50 engage with each other, so that even if the return electromagnet 40 is de-energized, it is held in the same position as in the energized state. Ru.
In other words, the information can be stored mechanically until the paper feed transmission gear 50 completes one revolution. Up to this point, the second special gear section 452a of the switching gear 45 and the first special gear section 502a of the paper feed transmission gear 50 have been explained.
The paper is fed until the first special gear part 502c of the paper feed transmission gear 50 is positioned within the rotation locus of the second and third special gear parts 452a and 452b of the switching gear 45. This is 1/2 rotation of the transmission gear 50. Then, since the return lever 41 is not engaged with the switching gear 45 as in the energized state, the second special gear 452a of the switching gear 45 and the first special gear of the paper feed transmission gear 50 are connected as before. It engages with the portion 502c and begins to rotate. Then, the engagement between the end 411 of the return lever 41 and the second cam portion 503 of the paper feed transmission gear 50 is disengaged, and the return lever 41 is moved by the return lever spring 56 and the second cam surface 572 of the sliding cam 57. It is then pushed back and returned to the position where it smoothly engages with the switching gear 45 again due to the gap E created between the return lever 41 and the switching gear 45. Therefore, within the rotation locus of the second and third special gear parts 452a and 452b of the switching gear 45,
First special gear part 502a of paper feed transmission gear 50
is positioned again, the paper feed transmission gear 50
will automatically stop rotating and the carriage can be raised again. On the other hand, the engagement between the end 521 of the release lever 52 and the cam portion 501 of the paper feed transmission gear 50 is disengaged, and the positioning plate 28 and the transmission lever 5 are disengaged by the counterclockwise urging force of the positioning spring 55.
3 and the release lever 52 also return to their original positions, and the positioning plate 2
8 triangular teeth 281 and the engaging portion 17 of the carriage 17
1 is engaged again, the correct position of the hammer 18 relative to the type wheel 12 can be ensured, and printing is possible.

In the description according to one embodiment of the present invention, the first special gear portions 502a, 502c of the paper feed transmission gear 50
are at two opposing locations, and the second special tooth portion 452a of the switching gear 45 is one, but the number of teeth on the gear,
There are no restrictions on the types of teeth, etc., and for example, the second special tooth portion 452a of the switching gear 45 has one tooth, the third special gear portion 452b has nine teeth, and the first tooth of the paper feed transmission gear 50 has one tooth. Special gear part 502a, 5
02c each and 20 pieces for the second special gear part 502b, the return lever 4
1 is operated in the direction of arrow D by the return electromagnet 40. The engagement with the switching gear 45 is disengaged, and the switching gear 45
passes through the second cam surface 572 of the sliding cam 57 and simultaneously slides in the direction of the first cam surface 571, that is, in the direction of arrow C, and connects the second special gear portion 452a of the switching gear 45 and the second special gear portion 452a of the paper feed transmission gear 50. When the paper feed transmission gear 50 starts rotating by meshing with the special gear portion 502a of No. 1, the release lever 52 is caused to release the carriage 17, and the return lever 41 is caused to perform a control operation. Since the number of teeth of the switching gear 45 is 10 and the number of teeth of the paper feed transmission gear 50 is 22, the paper feed transmission gear 50 rotates half a turn and stops by the first rotation of the switching gear 45. This is because the teeth that mesh with the second rotation of the second special gear part 452a of the switching gear 45 are the second special gear part 502b, which is one tooth before the first special gear part 502c of the paper feed transmission gear 50. , the timing of the next meshing is between the third special gear part 452b of the switching gear 45 and the first special gear part 502c of the paper feed transmission gear 50, so the switching gear 45 is engaged with the first cam surface of the sliding cam 57. 571, but it is impossible to engage in the thrust direction position, so it stops. Therefore, the switching gear 45 idles in the second rotation, and again in the third rotation, the second special gear part 452a of the switching gear 45 and the first special gear part 502c of the paper feed transmission gear 50 are rotated. When engaged, the paper feed transmission gear 50 begins to make the remaining half turn, returns the release lever 52 and the return lever 41 to their original positions, makes a half turn, and then stops as described above. The switching gear 45 engages with the return lever 41 again at the second cam surface 572 of the sliding cam 57 while idling during the fourth rotation. Therefore, it became possible to perform printing and digit alignment again.
Furthermore, in the first half rotation of the paper feed transmission gear 50,
The return and paper feeding operations of the carriage 17 are restored to their original positions in the second half of the rotation so that the respective operations can be started again. The switching gear 45 is located between the first half rotation and the second half rotation.
Needless to say, this is the most convenient standby (stop) position for the printer, since only one mechanism operates and the other mechanisms are at the end/stop section. Like this,
A wide variety of combinations of the number of teeth, tooth shape (length), etc. can be considered, and the switching of power by the thrust of the gear can be carried out effectively.

As detailed above, according to the present invention, the suction of the return lever is assisted by the cam of the switching gear, the suction distance with the return electromagnet is shortened, and the switching gear is slid so as not to come into contact with the return lever. The cam creates a gap, and after the return electromagnet is attracted, the cam temporarily holds it in the same position as when it was attracted, reducing the burden of attraction as much as possible, resulting in low power consumption and simple operation. The structure is inexpensive, and by adding a small electromagnet, the carriage can be transferred and paper fed simply by switching the gear to the thrust direction.
Possible with only one power source, more compact and lightweight,
Moreover, it becomes possible to realize a low-cost serial printer.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the printer of the present invention.
FIG. 2 is a perspective view of the carriage of the present invention. FIG. 3 is a schematic cross-sectional plan view of the present invention. Fourth
The figure is a side view of the present invention. FIG. 5 is a detailed diagram of the gear of the present invention. FIG. 6 is a detailed plan view of a gear according to the present invention. 12... Type wheel, 17... Carriage, 18... Hammer, 22... Ratchet wheel, 23... Trigger lever, 24...
Trigger transmission member, 25...Trigger lever actuation plate, 26...Trigger actuation shaft, 28...Positioning plate,
30... Electromagnet, 33... Motor, 40... Return electromagnet, 41... Return lever, 42... Carry gear, 4
7, 48... Frame, 49... Return spring, 52... Release lever, 53... Transmission lever, 54... Paper feed roller, 55... Positioning spring, 56... Return lever spring, 57... Sliding cam.

Claims (1)

[Scope of Claims] 1. A first driven vehicle that operates the carriage carry-up transfer means; A second driven vehicle that operates the carriage return transfer means and the paper feeding means; The first driven vehicle and the second driven vehicle a motive vehicle for driving the motive vehicle; a sliding means for sliding the motive vehicle in the thrust direction; and a control means for controlling sliding of the motive vehicle in the thrust direction; The control means includes a sliding spring that pushes the motor vehicle in the thrust direction, and a sliding cam that pushes the motor vehicle back in the thrust direction against the sliding spring. It consists of a lever spring that biases the lever to a position where it engages with the motive vehicle, and an electromagnet that resists the biasing force of the lever spring and releases the lever from the position where it engages with the motive vehicle; Carriage transfer for a small serial printer, characterized in that the drive by the motive vehicle can be switched between the first driven vehicle and the second driven vehicle by sliding the motive vehicle in the thrust direction by a means.・Paper feeding mechanism.