JPS59106983A - printing device - Google Patents

Abstract

PURPOSE:To integrate a motor and a detector to simplify a control circuit, by constituting the titled apparatus so that a carriage is positively returned to the starting point position thereof each time when changed over to transverse feed from paper feed and the position thereof is determined on the basis of motor rotation. CONSTITUTION:A starting point detector 6 consists of a pair of a light emitting diode and a phototransitor and detects that a carriage 1 reaches the starting point position by such a state that the shutter 7 provided to the carriage 1 enters a slit part 6a and the light of the light emitting diode is blocked. When a swing lever 14 is swung to the right side, a drive gear 17 is meshed with the transmission gear 32 of a platen side and a motor 12 performs paper feed. When the swing lever 14 is swung to the left side, the drive gear 17 is meshed with the transmission gear 18 of the carriage side and the motor 12 performs the transverse feed of the carriage 1. At this time, the motor 12 is reversely rotated and the position of the carriage 1 is determined on the basis of the signal from the detector of the motor 12 based on the starting point position while the carriage 1 is traversely fed toward the right to perform printing operation according to a printing order.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing device such as a tie writer in which a single motor is used to feed a carriage containing a printing mechanism horizontally and to feed printing paper. be.

2. Description of the Related Art Structures and Problems Therein, in recent years, a large number of printing apparatuses whose printing operations are electronically controlled have appeared. In these printing operation means, all conventional mechanical parts are replaced with motors, electromagnetic solenoids, etc., and the printing operation means are electronically controlled. Motors, electromagnetic lenses, control electrical elements, etc. are often more expensive than mechanical parts, so
It is necessary to devise ways to use these effectively and reduce their quantity.

A conventional printing device will be explained below.

A carriage carrying a printing mechanism performs a printing operation while reciprocating parallel to a platen holding printing paper at an appropriate distance. This reciprocating motion of the gear ridge is achieved by fixing the carriage to a belt or rope hooked around a pair of pulleys provided outside the printing operation range, and rotating one of the pulleys five times using a dedicated motor. Paper is fed by rotating the platen.
The shaft of the platen is also rotated by a dedicated motor via a speed reduction mechanism.

As mentioned above, conventional printing devices are equipped with separate motors for the carriage's lateral feed and the platen's paper feed, and it is necessary to provide a motor rotation detector to control the two motors. This has the problems of being expensive and complicated to control.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a printing device in which a single motor can switch between horizontal feeding of a carriage including a printing mechanism and paper feeding of printing paper, and in which the operations can be accurately controlled. It is.

Structure of the Invention The printing device of the present invention comprises: a traverse feeder that moves a carriage including a printing mechanism in a lateral direction for printing; a paper feeder that fully feeds printing paper; the traverse feeder and the paper feeder. one motor that selectively drives the motor; and a detection unit that detects the rotation of the motor.

67, a switching device for selectively switching and transmitting the driving force of the motor to the horizontal feeding device and the paper feeding device; It is fully equipped with an origin detection means for detecting the origin and a control means for controlling each of the above-mentioned components, and each time the switching means switches from paper feeding to horizontal feeding, the origin detection means detects the origin position and moves the carriage to the origin position. The control means controls the carriage to return to the original position, determines the position of the carriage based on a signal from a detector of the monitor, and drives the traversing means, using the origin position as a reference. This allows a single motor to feed the carriage horizontally and feed the printing paper.
This allows its operation to be accurately controlled.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a partially cutaway bottom view of a printing device according to an embodiment of the present invention. As shown in Figure 1, 1 is a carriage on which the entire printing mechanism is mounted, 2 is a platen around which the printing paper is wound and feeds the paper by rotating itself, and 3 is a carriage that connects the carriage 1 to the platen. 2 is a guide rail that guides the transverse feed, 4 is a machine frame that holds each element of the switching mechanism described later, 5 is a side plate that holds the machine frame 4 and the guide rail 3, and 6 is a pair of light emitting diodes. and a phototransistor, the shutter 7 provided on the carriage 1 enters the slit part 6a and blocks the light from the light emitting diode, thereby completely detecting that the carriage 1 has come to the origin position. 8 and 9 are the carriage A gear 11'f is fixed coaxially with the pulley 8. When the gear 11'f is rotated, the wire 1o is fed by the pulley 8, and the carriage 1 is traversed. The pulley 9 is rotatably fixed to the machine frame 4 and rotates as the wire 1o is fed.

12 is a driving motor, and a detector (not shown) for detecting the rotation of the motor 12 and a pinion gear 13 are coaxially attached. Reference numeral 14 denotes a swing lever that swings around the entire center of the shaft 16 of the gear 15; 17 is a drive gear rotatably held by the swing lever 14; 18 is a carriage-side transmission gear that meshes with the gear 11; 15, a drive gear 17, a carriage-side transmission gear 18, and a gear 11 form a complete gear train in which they mesh in sequence, and transmit the driving force of the motor 12 for lateral feeding of the carriage.

19 is a platen shaft; 20 is a ratchet wheel that is fixed to the platen shaft 19 and rotates together with the platen 2;
Numeral 21 is a ratchet to which the shaft 22 is pivotally attached and urged by a torsion spring (not shown) to mesh with the ratchet wheel 20. Numeral 23 is rotatably held on the platen shaft 19 and is connected to the shaft 22 and the driven pin. 24 is a ratchet holding plate fixed to the outer periphery; 25 is a drive lever that rotates about a shaft 26 and has a drive pin 27 fixed; 28 is a slide follower whose elongated hole is guided by a guide bin 29 and moves left and right; 3o
is an eccentric cam, 31 is a gear that rotates together with the eccentric cam 30, and 32 is a platen side transmission gear.

9., 2. Binion gear 13, gear 15, drive gear 17, platen side transmission gear 32, gear 33, gear 34, and gear 31 sequentially form a gear train, and the rotation of motor 12 is greatly reduced to reduce the rotation of eccentric cam 30. Rotate.

The slide follower 28 slides to the right by the eccentric cam 3o to rotate the drive lever counterclockwise, and the drive pin 27 pushes up the driven pin 24, thereby rotating the ratchet holding plate 23.

2 and 3 are views of the platen 2 in FIG. 1 viewed from the direction of the arrow AA', and are diagrams for explaining the movement of the ratchet holding plate 23.

When the ratchet holding plate 23 is rotated clockwise by the driving pin 27 via the driven pin 24 from the state shown in FIG. 2 to the state shown in FIG. rotates together with the ratchet wheel 20 to feed the paper. Note that the ratchet holding plate 23 is biased to rotate counterclockwise by a spring (not shown), and the driven pin 24 is constantly in contact with the drive pin 27, so that the drive pin 27 is in the state 10 in FIG. Even if the ratchet retaining plate 23 returns to the original position, the ratchet retaining plate 23 returns to its original position.

Next, returning to FIG. 1, the configuration of the switching mechanism will be explained in detail.

36 is a slide lever whose elongated hole is guided by a guide pin 36 and moves left and right to swing the swing lever T14 via a shaft 37; 38 is a slide lever with one end attached to the machine frame and the other end attached to the slide lever 35; This is a first spring that is stretched around the first spring hanging portion 351L and biases the slide lever 35 to the right so that the drive gear 17 meshes with the gear 32. 39 is the shaft 40
It is a follower lever that is rotatable around the center and is swung left and right by an eccentric cam 30. 41 is suspended by hanging one end on the spring hook 39a of the follower lever 39 and the other end on the second spring hook 36b of the slide lever 35, and the follower lever 39 is swung leftward by the eccentric cam 3o. When the second spring is applied with a biasing force, the slide lever 35 is biased to the left against the biasing force of the first spring 38.
The drive gear 17 can be meshed with the carriage side transmission gear 18. Reference numeral 42 denotes a first lock 11 .
remains in mesh with the platen side transmission gear 32. 42b
44 is a follower part integrated with the first locking lever 42, and 44a is a disc that rotates together with the eccentric cam 3o and the gear 31.
is a protrusion provided on the outer periphery of the disc 44, and
The first locking lever 42 is rotated clockwise by a spring 45 stretched between the frame 4 and the machine frame 4, and the follower portion 42b is rotated clockwise.
always follows the outer periphery of the disk 44.

When the follower portion 42b is pushed down by the protrusion 44a due to rotation of the gear 31, the locking portion 42a and the locking portion 350 are disengaged. 46 is a second locking lever rotatable around a shaft 47; 46a is a locking portion 39b of the follower lever 39;
48 is an electromagnet, and 49 is a drive lever biased to rotate counterclockwise by a spring 51 about a fulcrum 5o, which pushes the connecting lever 52 to the left.
The locking portion 46a and the locking portion 3 are rotated counterclockwise.
9b. When the electromagnet 48 is energized, the drive lever 49 is attracted against the spring 51, and the engagement between the locking portion 46a and the locking portion 39b is released.

Regarding the printing device of this embodiment configured as described above,
The operation will be explained below.

4 to 6 are essential bottom views for explaining the entire operation of the embodiment shown in FIG. 1. FIG.

First, the state shown in FIG. 1 will be explained. FIG. 1 shows a state in which the swing lever 14 swings to the right, the drive gear 17 and the platen side transmission gear 32 mesh, and the paper feeding operation is started.

The swing lever 14 is biased to the right by a first spring 38 stretched around the slide lever 35, and
The locking portion 36C of No. 5 is the locking portion 42 of the first locking lever 42.
aK is locked and prevents the swinging lever 14 from swinging to the left. In the paper feeding state, the rotation of the motor 12 causes the pinion gear 13 to rotate counterclockwise, causing the gear train on the paper feeding side to rotate. The eccentric cam 30 is rotated counterclockwise by sequential rotation.

FIG. 4 shows a state in which a portion of the eccentric cam 3°13 has rotated approximately 1/4 due to the rotation of parts 12 and 12. At this time, the follower lever 39 swings to the left by the maximum displacement amount by the eccentric cam 30, and the second spring 41 is stretched. at the same time,
The locking portion 39b of the follower lever 39 and the second locking lever 4
6 is in a locked state, and the second spring 41
The follower part 42b of the first locking lever 42 does not move only along the outer periphery of the disc 44, and the locking part 42a and the locking part 350 of the slide lever 35 are locked. is maintained.

FIG. 5 shows a state in which the eccentric cam 3o has further rotated and has made about a half turn from the state shown in FIG. The slide follower 28 is pushed to the right by the maximum displacement amount by the eccentric cam 30, the drive lever 25 rotates counterclockwise around the shaft 26, and the driven pin 24 is pushed up, changing from the state shown in FIG. 2 to the state shown in FIG. Rotate the platen until it reaches this position and feed the paper. At this time, the contact between the seventh lower lever 39 and the eccentric cam 30 is eliminated, but the locking portion 39b remains locked with the locking portion 46& of the second locking lever 46.

Figure 6 shows a state in which the paper feeding operation has been completed, the swing lever 14 has swung to the left, the drive gear 17 has engaged with the carriage side transmission gear 18, and the carriage has switched to lateral feed operation. The eccentric cam 30 of FIG.

Due to the force of a spring (not shown) that returns the ratchet holding plate 23 counterclockwise as described in FIG. 3, the ratchet holding plate 23 is returned to its initial position via the driven pin 24, the driving pin 27, and the driving lever 26. The follower portion 42b of the first locking lever l-42 is pushed down by the protrusion 44L of the disc 44, and the locking between the locking portion 421L and the locking portion 350 of the slide lever 35 is released. Then, the second spring 4 having a stronger urging force than the first spring 38
1 pushes the slide lever 36 to the left, the swing lever 14 swings, the drive gear 17 meshes with the carriage-side transmission gear 18, and the carriage is switched to traverse movement. During lateral feed operation, follower L/bar 39
The locking portion 39b of the locking portion 46& of the second locking lever 46 is kept locked, and the swinging lever 14 is biased by the second spring 41, so that the drive gear 17157 and the carriage side transmission gear 18 maintain engagement with Even after switching from paper feeding to horizontal feeding, the motor 12 is rotated counterclockwise by a control circuit (not shown), sequentially rotating the gear train on the horizontal feeding side, and rotating the pulley 8 counterclockwise.

The wire 10 is fed by the rotation of the pulley 8, and the carriage 1 is fed horizontally to the left. When it reaches the left end, the shutter 7 of the carriage 1 is inserted into the slit portion 6a of the origin detector 6.
enters and informs the control circuit that the carriage 1 has come to the home position.

At this time, the motor 12 is rotated in the reverse direction, the position of the carriage 1 is determined based on the signal from the detector of the motor 12 with the origin position as a reference, and the carriage 1 is transversely moved to the right.
Printing operations are performed according to print commands. -When a line is finished printing, the paper is fed for fun. It energizes the electromagnet 48 in response to a command from the control circuit, and the second locking lever 46
is rotated clockwise to disengage the locking portion 461L from the locking portion 39b of the follower lever 39. 1st
The figure shows a state in which the horizontal feed operation is switched to the paper feed operation. The second spring 41 becomes close to its natural length and loses its biasing force. Therefore, the slide lever 35 is pushed to the right by the biasing force of the first spring 38, the swing lever 14 swings, and the drive gear 17 meshes with the platen side transmission gear 32.
Switches to platen paper feeding operation. At the same time, Sly f”
The locking portion 350 of the lever 35 is locked with the locking portion 42a of the first locking lever 42, and the slide lever 35 is held so as not to move to the left.

As described above, according to this embodiment, a switching means is provided for switching between horizontal carriage feeding and paper feeding on the platen, and each time paper feeding is switched from paper feeding to horizontal feeding, the carriage is returned to the origin position, and the origin position is used as a reference. By controlling the position of the carriage, a printing device that can drive both horizontal feed and paper feed with a single motor and can be accurately controlled has been realized.

In this example, a pair of light-emitting diodes and a phototransistor are used as the origin detector, and a shutter is used to cut off the source of the light-emitting diode. A switch such as a switch may be pressed by a carriage. Additionally, when the carriage touches the left end, the drive current is not applied to the motor and the motor cannot rotate, and the motor detector indicates that the motor is not rotating. (that is, at the left end), there is no need to provide a special origin detector.

Effects of the Invention As is clear from the above explanation, the printing device of the present invention has the following effects:
A single motor selectively switches and drives the carriage's horizontal feed means and the printing paper's paper feed means, and each time the paper feed is switched from paper feed to cross feed, the carriage is returned to its original position without moving all the way, and this original position is used as a reference. , the position of the carriage is determined based on the signal from the detector that detects all rotations of the motor,
Since it is configured to perform lateral feed operation, it only requires one motor and one detector to detect the rotation of the motor, which has the advantage of simplifying the control circuit and realizing it at low cost. The result is 18 bases. In particular, since the carriage is returned to its original position and then laterally fed, there is no effect even if the carriage moves due to vibration or the like during the paper feeding operation, and moreover, good positional accuracy can be achieved.

Furthermore, switching from paper feeding to cross-feeding is performed using the four
Using only the driving force, a biasing force is applied to a spring member that biases the paper toward the horizontal feed side during paper feeding, and when paper feeding is completed, the swinging member is unlocked and switched by the biasing force of the spring member. With this configuration, it is possible to switch from paper feeding to horizontal feeding without external power.

In addition, switching from horizontal feeding to paper feeding is achieved by releasing the locking member of the spring member that urges the horizontal feeding side from the locked state using the electromagnetic drive means, and the spring member that urges the paper feeding side. By adopting a configuration in which all the swinging members are switched by the urging force of , the electromagnetic driving means may be a small electromagnet or the like with a light driving force that releases the locking member of the spring member from the fully locked state. Therefore, it is possible to provide a printing device that can save power.

19 pages

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway bottom view of a printing device according to an embodiment of the present invention, and FIGS. 2 and 3 are arrows AA' in FIG. 1.
Figure 4 is a side view of the main part seen from the line. 5 and 6 are essential bottom views for explaining the operation of the embodiment of the present invention. 1... Carriage, 2... Platen, 3...
...Guide rail, 6...Origin detector, 7
・・・・・・Shutter, 8°°°゛°゛Pulley, 1
0...Wire, 12...Motor, 1
4... Swing lever, 17... Drive gear, 18... Carriage side transmission gear, 2o...
...Ratchet wheel, 21...Ratchet y)
, 23...°° ratchet retaining plate, 28...
Sliding lower, 3o...Eccentric cam, 32.
...Platen side transmission gear, 38...1st bar,
L39...Follower lever, 41...
Second spring, 44... Disk, 46... Second locking lever, 48... Electromagnet. Name of agent: Patent attorney Toshio Nakao and one other person.

Claims (2)

[Claims] (1) Selectively drive a horizontal feeding device that moves a carriage including a printing mechanism in a horizontal direction for printing, a paper feeding device that feeds printing paper, and selectively drive the horizontal feeding device and the paper feeding device. a position detector that generates a position signal according to the rotational position of the motor; and a switching device that selectively switches and transmits the driving force of the motor to the horizontal feeding device and the paper feeding device. an origin detection means for generating a predetermined origin position signal by detecting that the carriage is at a predetermined origin position; The carriage is provided with a motor and a control means for driving and controlling the switching means, and when the switching means is switched from the paper feeding means to the horizontal feeding means, the carriage is moved to a position 2 and 3 from which the origin position signal is obtained. , and receives the position signal and the origin position signal, associates the rotational position of the motor with the current position of the carriage, and controls the position of the carriage. A printing device patented for configuring the control means. (2) The switching means includes a first transmission gear for transmitting power to the paper feeding means, a second transmission gear for transmitting power to the traversing means, and a first transmission gear and a first transmission gear driven by a motor. a drive gear that selectively meshes with the second transmission gear; a swinging member that is rotatably held on the machine frame and holds the drive gear; and a swinging member that is stretched between the swinging member and the machine frame, a first spring member that biases the swinging member so that the gear and the first transmission gear mesh with each other; the drive gear and the second
a second biasing member that urges the swinging member so that it meshes with the transmission gear;
When the spring member and the driving gear mesh with the first transmission gear to perform a paper feeding operation, the swinging member is engaged so that it is not pulled back by the biasing force of the third and second spring members. a first locking member that stops the paper; an eccentric cam member that is driven by the paper feeding means and operates in synchronization with one cycle of the paper feeding operation;
A 7-year-old lower member that works together with the eccentric cam member to tension the second spring member while holding the other end thereof during the paper feeding operation in order to apply a biasing force to the second spring member; In order to hold the second spring member, a second locking member locks the follower member, and a second locking member operates in synchronization with the end of the paper feeding operation, and the second locking member locks the follower member. a first releasing means that releases the locking of the member and swings the swinging member by the biasing force of a second spring member to switch from paper feeding operation to cross-feeding operation; and a second release means for releasing the engagement of the follower member by the member and swinging the swinging member by the biasing force of the first spring member to switch from the horizontal feeding operation to the paper feeding operation. A printing device according to claim (1), characterized in that: