JPS5985760A - Printing apparatus - Google Patents

Abstract

PURPOSE:To attain to simplify a mechanism, to reduce the number of operation members and to lower friction and abrasion, by directly moving a type cup up and down by the movable iron core of a solenoid device. CONSTITUTION:When a shift signal is inputted to an electromagnetic solenoid 53, a movable iron core 54 having a type mount member 49 mounted to the lower end part thereof is attracted and moved upwardly by electromagnetic force. In this case, said iron core 54 is moved from a position where a type cup 42 is fallen so as to oppose an upper stage type part 45a to the leading end part of the operation body 51a of a printing hammer 51 to a position where the type cup 42 is raised so as to oppose a lower stage type part 45b to the leading end part of the operation body 51a of said printing hammer 51.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a serial impact type printing device using a type wheel.

Conventional configuration and its problems, -! In recent years, instead of printing devices using petal-shaped type wheels with type at the tips of radially formed spokes, conventional flat type type 71 has been used to speed up printing.
A printing device has been developed that uses a type cup in which the spokes of the eel are raised into a cup shape to reduce the moment of inertia. Since this type cup has two stages of type, the type can be selected by two movements of rotation and shifting, reducing the moment of inertia, shortening the time for selecting type, and enabling high-speed printing.

Figure 1 is a diagram showing the printing mechanism of a conventional printing device using a type cup as described above, where 1° is the printing paper 1.
1, and 12 is a type cup in which type portions 14a and 14b are arranged in two stages at the tips of a large number of spokes 13. Type characters 14a, 14 located on the platen 10 side
A printing hammer 16 is arranged on the back side of b, and when a signal is input, the printing hammer 16 presses the printing part 14b (
Or 14a) is pressed against the printing paper 11. Type section 14
There is an ink ribbon 17 between b (or 14a) and the printing paper 110, and printing is performed. The type cup 12 is attached to a type holding member 18, and the type holding member 1
Since the protrusions 19 of 8 fit into the holes or notches 16 of the type cup 12, rotational motion can be transmitted. The type holding member 18 is supported on a rotating shaft 19a of a motor 19 so as to be rotatable and movable up and down. A rotation transmission member 2o is fixed to the rotation shaft 19a of the motor 19, and the pin 21 fixed to the rotation transmission member 2o and the protrusion 22 of the type holding member 18 are mutually connected to the rotation shaft 19a of the motor 19.
Since they are engaged so as to be movable in the longitudinal direction, the rotation of the motor 19 is transmitted to the type cup 12 via the type holding member 18, but the type cup 12 can freely move up and down.

23 is a rotary solenoid, and an eccentric shaft 24 is attached to its output shaft.

'The shift lever 26 is rotatably attached to a fixed part (not shown) with a pin 25, and is fitted into a long hole drilled at one end of the shift lever 26, and the other end of the shift lever 26 is fitted with a type holder. A short pin 27 is provided in the groove 18a of the member 18.

The shift lever 2 is shifted by the rotation of the low clean lens 23.
6 rotates the pin 25 in the middle and closes it, and the type holding member 1
Move 8 up and down 0 When printing, motor 19 and low clean lens 2
After 30 rotations and 20 rotations of the type cuff and vertical movement to select a type, the print hammer 16 is operated to complete the printing operation.

However, the conventional printing device configured as described above requires a complicated mechanism for rotating the type cup and moving it up and down, so it is not suitable for miniaturization of the device, and furthermore, due to its structure, it is prone to friction. There were problems such as the large force increases the load on the motor and rattling due to wear.

purpose of invention The object of the present invention is to be suitable for miniaturization and to reduce friction.

An object of the present invention is to provide a printing device with excellent reliability due to reduced wear and the like.

Structure of the Invention The printing device of the present invention supports a type cup so as to be rotatable about its rotation axis, and moves the type cup in the longitudinal direction (e.g., vertical direction) of its rotation axis by applying electricity. By using an electromagnetic solenoid with a J moving iron core (armature), the type cup can be moved efficiently. This is what I did.

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

FIG. 2 is a partially cutaway side view of a printing device according to an embodiment of the present invention. In the figure, reference numeral 40 denotes a puncher that holds printing paper 41. As shown in FIG. 42 is a type cup, which has a plurality of spokes 44 extending vertically at predetermined intervals from the vicinity of the outer periphery of the disk portion 43, and the outer tip of each spoke 44 has a type portion 45a arranged in upper and lower two stages; 45b is formed. A gear 46 is formed on the outer periphery of the disk portion 43 of the type cup 42 and meshes with a gear 48 fixed to the rotating shaft of a motor 47. Further, a hole or notch 43a is provided in the disk portion 43, and a convex portion 5o such as a bottle implanted in the type mounting member 49 is fitted into the hole or notch 43a to attach the type. The member 49 and the type cup 42 can be rotated and moved up and down together.

On the back side of the type part 45a (or 45b), there is a fixed stand 60.
An operating body 61a of the printing hammer 51 disposed above is located. When a signal is applied to the printing hammer 51, the actuating body 51a is projected to the right in FIG.
5a (i or 46b) toward the printing paper 41. Then, since the spokes 44 have appropriate elasticity, the printing portion 45a (or 45b) is pressed against the printing paper 41. An ink ribbon 62 is provided between the printing portion 46a (or 45b) and the printing paper 410. Printing is performed because the

Reference numeral 47 is a motor such as a stepping motor for controlling the rotational position of the type cup 42, and the rotational position is controlled by a control circuit (not shown). The gear 48 attached to the motor 47 has a thickness such that it remains engaged with the gear 46 of the type cup 42 even when the type cup 42 is shifted downward by -L. 53 is type cup 4
This is an electromagnetic solenoid for moving the print mark 6 up and down in the inner space of the print cup 42.
1 is attached to the upper surface of the fixed base 60.

When a shift signal is input, the electromagnetic solenoid 63 uses electromagnetic force to attract and move the armature 54, which has the type mounting member 49 attached to its lower end, upward.

As a result, as shown in FIG. 2, the type cup 42 is placed in a lowered position (hereinafter referred to as the first position) such that the upper type portion 45a faces the tip of the operating body 51a of the printing hammer 61. from, printing)・Operating body 61 of mark 51
The type cup 42 is brought to the raised position (hereinafter referred to as the second position) so that the lower type part 46b faces the tip of the letter a. Although the details will be described later, in this embodiment, after the armature 54 has been moved by suction, even if a shift signal is supplied to the electromagnetic solenoid 63, the armature 54 is moved to maintain the type cup 42 in the second position. The shift lever is configured to be held in an upwardly moved shift position. Furthermore, when the RESET, 1 signal is supplied to the electromagnetic solenoid 53, the armature 64 is released from being held at the shift position and returns downward, and accordingly, the type cup 42 also returns from the second position to the first position. It is supposed to be done.

FIG. 3 is a side sectional view showing an example of the electromagnetic solenoid 53. A shaft 61 is fixed to the center of a fixed base 60, and this shaft 61 has a cylindrical rotor 62 and an armature that is a movable iron core. 54 are supported in a vertical positional relationship. The rotoro 2 is made of a magnetic material, and a sliding bearing 63 is press-fitted into its center.

Therefore, the rotor 62 can freely rotate on the shaft 61. Although the rotor 62 can also move in the axial direction, it normally rests on a flange portion 61a provided on the shaft 61 due to its own weight.

Armature 64 also -! It is made of a magnetic material, and a beveled bearing 55, 56 is press-fitted into its center. Therefore, the armature 54 is rotatable on the shaft 61 and can move 11 times in the longitudinal direction of the shaft.

A coiled spring 64 is provided between the armature 54 and the flange portion 61a of the shaft 61, and the armature 64 is arranged so as to bring the type cup 42 to the first position.
is biased to move downward. Furthermore, this armature 5
4d, the lower end of the coiled spring 64 is stopped at a position where it hits the E1,1 ring 66 attached to the shaft 61. In this position, the slider washer 66 is connected to the sliding bearing 66 and the E1,1 ring 65. Since the armature 54 is sandwiched in between, the rotational resistance of the armature 54 is very small.

The upper portion 54a of the armature 54 is provided with a tapered bar, and the upper portion 54a of the armature 54 is provided with a tapered bar.
The lower part of the rotor 62, which faces the rotor 62, has four tapered parts 62a, which are the same as the upper part of the armature 54. 6
Yokes 7 and 68 are made of magnetic material 1 and have substantially inverted convex and concave cross sections, respectively, and these are coupled and arranged so as to surround the coil 69.

The yoke 67 accommodates the rotor 62 in a non-contact manner in the center, and the armature 540 from below.
It has a through hole 67a large enough to allow the tenth part 54a to move in and out of the four parts 62a of the rotor 62. The yoke 67
, and 8 have an appropriate gap 70 between the outer peripheral surfaces of the rotor 62 and the armature 54, respectively.
．． They are facing each other with a score of 71.

When the coil 69 is energized, the yoke 68, 67 to the rotor 6
A magnetic flux is generated in the magnetic path formed by the armature 64, and the armature 64 is attracted to the rotor 62 by magnetic attraction. The moving distance of armature 64 is type cup 4
It is equal to the shift amount of 2.

Figure 4 shows the electromagnetic solenoid 53 when the coil 69 is energized.
This is a schematic diagram showing the general state of the magnetic flux generated inside the device, and the magnetic flux is represented by a broken line in the figure. Gap 70.7
Since the magnetic flux passing through rotor 62.1 is radially oriented and uniform over the entire circumference, Armature 54
There is no radial force. However, the magnetic flux passing through the gap G between the tapered upper part 54a of the armature 64 and the tapered recess 62a of the rotor 62 generates a force in the axial longitudinal direction, compressing the coiled spring 64 and moving the armature 54. It is moved upward and the rotor 6 and armature 54 are attracted to each other. Since the rotor 62 and the armature 64, which are attracted to each other, are stopped at a position where the rotor 62 contacts the flange portion 61a of the shaft 61 by the force of the coiled spring 640, the shifted position of the type cup 42 is always constant. Since there is no lateral pressure acting on the bearing even after suction, the rotational resistance of the boom 1f 540 is extremely small. Furthermore, after the attraction, the gap G becomes smaller and the magnetic resistance decreases, so the excitation force required to maintain the attraction of the armature 54 can be reduced. Since the suction portion of the armature 64 is tapered, a large excitation force is not required even at the suction start position where the gap G is large.

When the coil 69 is de-energized, the armature 64 moves downward by its own weight and the action of the coiled spring 64, and waits at a position where its lower end touches the E-ring 66.

As described above, according to this embodiment, when the type cup is removed from the 4-J
The armature connected to the type mounting member can be moved up and down directly by magnetic force without contact. Furthermore, the number of moving parts is reduced, reliability is improved, and the device can be made smaller. Further, since the rotational resistance when rotating the type cup is small, and the load inertia is also small, effects such as a reduction in the load on the motor are produced.

In addition, in the above-described embodiment of the present invention, the motor and the type cup are connected by a gear in order to rotate the type cup, but the connection between the motor and the type cup is not limited to using gears. , In addition, for example, the shaft 61
A structure in which the rotating shaft of the motor is directly connected may be adopted.

FIG. 5 is a side sectional view showing another embodiment of the electromagnetic solenoid 53 used in the present invention. This will be explained below, but the same reference numerals will be given to those having the same functions as those explained in the embodiment shown in FIG. 3, and the redundant explanation will be omitted here. In the embodiment shown in FIG. 5, a cylindrical (ring-shaped for 17 companies) permanent magnet 72 is located on the lower surface 67c of the yoke 67. This permanent magnet 72 (d) is magnetized in the thickness direction, and a ring-shaped core 73 made of magnetic gain is fixed to the lower surface. There is a gap between the outer circumferential surface and the required distance via 1]74.

6 and 7 schematically show the outline of the magnetic flux generated inside the electromagnetic solenoid 53 in FIG. 5. In FIG. 6, when the armature 54 is in the lowered return position, FIG. 7 shows the case where the armature 54 is in the upward shift position.

In FIG. 6, the solid line represents the magnetic flux generated by the permanent magnet 72, and the broken line and one-dot chain line represent the magnetic flux generated by the coil 69 when a shift signal is input.

As shown in FIG. 6, when the armature 64 is in the return position, the magnetomotive force of the permanent magnet 72 generates magnetic flux in the magnetic path from the core 73 to the gap 74 to the armature 54 to the gap 71 to the yoke 68 to the yoke 67. . Gap 74 and Gap 7
Since the direction of the magnetic flux passing through 1 is in the radial direction of the armature 540, no force is generated to move the armature 54 in the axial longitudinal direction. Note that the magnetic flux generates a force that pulls the armature 54 in the radial direction, but the gaps 71 and 74 are ffl+
Since they are symmetrical, J'J cancel each other out, and the armature 541 is not subjected to any force in the radial direction.

Therefore, the sliding bearings 55 and 56 of the armature 54 are not subjected to side pressure, so rotational resistance is very small.

In the state shown in FIG. 4, when a shift signal is input to the coil 69, a magnetic flux is generated in the magnetic path from the yoke 67 to the yoke 68 to the gap 71 to the armature 54. Armature 5
When the distance between armature 4 and rotor 62 is large, armature 6
Most of the magnetic flux emitted from the yoke 67 does not pass through the rotor 62, but passes through the flange portion 67C at the bottom of the yoke 67. As the coil 69 is energized, the armature 54 begins to move upward.

When the distance from the rotor 62 becomes smaller, the armature 54
The magnetic flux emitted from the rotor passes through the rotor 62 and the gap 70 and enters the yaw 67, as shown by the dashed line in FIG. The 4+Ti bundle passing between the armature 64 and the yoke flange portion 67d or between the armature 64 and the rotor 62 does not move the armature 54 in the axial direction and generates force. In this case as well, the forces that pull the armature 54 in the radial direction cancel each other out, so no lateral pressure is generated, and the armature 54 moves smoothly nine rotations in the axial direction. Here, when the armature 64 is attracted to the rotor 62, ,
The magnetomotive force of the permanent magnet 72 generates a magnetic flux as shown by the solid line in FIG. The armature 54 is magnetically attracted to the rotor 62 due to the magnetic flux passing through it. Another magnetic path from permanent magnet 72 to core 73 to gap 74°
~ Armature 54 ~ Gap 71 ~ Yoke 68 ~ Yoke 6
Magnetic flux is also generated in the permanent magnets 7 to 72, but no force is generated in the armature 54. Since the magnetic path between 0 and 7 has a larger magnetic resistance than the above-mentioned magnetic path, the magnetomotive force of the permanent magnet 72 is large. The armature 54 is attracted to the rotor 62. Therefore, even if the coil 69 is turned off, the armature 54 remains moved in both directions, and the type cup 42 remains in the second position.

When a return signal (a signal flowing in the opposite direction to the shift signal) is applied to the coil 69 in order to return the armature 54 to the return position, a magnetic flux as shown by the broken line in FIG. 7 is generated. Of the magnetic flux generated by the permanent magnet 72, the magnetic flux passing through the armature J-764 and the rotor 62 is canceled out by this magnetic flux, and a part of it is canceled by the armature 6 as shown by the dashed line.
4 to the yoke flange portion e7d. For this reason,
Since the armature 54 is no longer subjected to the attraction force in the longitudinal direction of the shaft due to the magnetic force of the permanent magnet 72, it moves downward due to its own weight and the action of the coiled spring 640, returns to the return position, and stops.

By energizing the coil 69 as described above, the armature 64 is attracted to the rotor 62 by electromagnetic force, and after being attracted, the attracted state is maintained by the magnetomotive force of the permanent magnet 72. Then, when the coil 69 is energized in the opposite direction to that during shifting, the suction is released and the armature 54 returns to the return position. Therefore, by supplying a shift signal and a return signal to the coil 69, the type cup 42 is moved from the first position to the second position (selecting the type 45b) or from the second position to the first position (the type 45a).

According to the embodiment shown in FIG. 6, in addition to the effects obtained in the embodiment shown in FIG. is obtained.

In the embodiment shown in FIG. 6, the permanent magnet 72 is placed inside the yoke 68, but it is not limited to that location, and it may also be placed outside the solenoid or inside the movable iron core. You can also get the same effect. Additionally, in order to cancel the shift, a current opposite to that used during the shift was passed through the coil, but by using a coil exclusively for shifting and resetting, it is possible to avoid having to easily adjust the current value. .

Effects of the Invention As is clear from the above explanation, in the printing device of the present invention, the type cup is directly moved up and down by the movable iron core (armature) of the electromagnetic solenoid, so that it is difficult to shift the type force sog. This simplifies the mechanism and reduces the number of moving parts, thereby improving reliability and maintainability, and making the printing device more compact. In particular, by arranging the electromagnetic solenoid in the internal space of the type cup, further compactness can be achieved. In addition, in the solenoid, by rotatably supporting the part that attracts the movable core with an appropriate gap from the yoke, it is possible to reduce the rotational resistance of the type cup, and the wear of the rotating part can be significantly reduced. Effects can be obtained. Moreover, since the rotational resistance is reduced and the inertial load is also reduced, the output of the motor for rotating the type cup can be reduced, and the positioning accuracy of the type cup is improved.

Furthermore, when permanent magnets are used as illustrated in Fig. 5 above, the type does not need to be held in a shifted state and special electrical energy is not required, and the cap can be reset with a small amount of energy. , the excellent effect of being able to drive with less energy is also obtained, which brings about a great effect in realizing a power-saving and compact printing device.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an example of a conventional printing device.
Fig. 2 is a partially cutaway side view showing one embodiment of the present invention;
The figure is a side sectional view of an example of the electromagnetic solenoid used in the present invention, Figure 4-〇 An enlarged side sectional view of the main part to explain the operation of the electromagnetic solenoid, and Figure 6 is the side sectional view of an example of the electromagnetic solenoid used in the present invention. The side sectional views of other examples, FIGS. 6 and 7, are enlarged side sectional views of essential parts of the electromagnetic solenoid shown in FIG. 5 in various states. 40...Platen, 41...Print paper, 4
2...Type cup, 43...Disc part,
44...--Spoke, 46a, 46b...
・Printing section, 51...Printing section, 62...
・・・Ink ribbon, 53・ ・Electromagnetic solenoid, 64
... Armature, 60 ... Fixed base, 6
1---Yaft, 62...rotor, 64...
... Coiled spring, 67.68 ... Yoke, 69 ... Fill, 72 ... Permanent magnet, 73 ... Core. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 / 1067 kyu 1.54

Claims (1)

[Scope of Claims] (A plurality of flexible spokes are arranged in parallel at predetermined intervals on the outer periphery of a disc-shaped member to form a cup shape, and each of the spokes has a type portion at its outer tip. a type cup formed in two stages in the length direction of each spoke; a printing machine for striking the type part on printing paper; a motor for rotating the type cup; and a motor for rotating the type cup. A movable iron core that is rotatably supported around a shaft center and that, when energized, moves the type cup in the longitudinal direction of the rotation axis to bring the type portions of each stage to the striking position of the printing hammer. (2) The printing device according to claim (1), characterized in that the electromagnetic lens is disposed in the internal space of the type cup. (3) The electromagnetic printing device The renoids include a rotor including a magnetic material that is rotatably disposed on a shaft, and a first position that is rotatable on the shaft and that is spaced apart from the rotor by a predetermined distance, and that is in contact with or close to the rotor. A movable core is provided so as to be movable to and from a second position, and at least a portion of the movable core is disposed adjacent to the rotor and the movable core, respectively, so as to form a magnetic circuit including the rotor set and the movable core. first and second yokes made of a magnetic material arranged in the same manner, and generating magnetic flux in the magnetic circuit when energized to generate a magnetic attraction force between at least the rotor and the movable iron core; Magnetic flux generating means including a coil for moving the movable iron core from the first position to the second position;
It is characterized by having a structure comprising a permanent magnet that generates a magnetic flux between the movable iron core brought to the second position and the rotor to hold the movable iron core at the second position. Claims (1) or (2)
) Printing device described in section. (4) The rotor is composed of a cylindrical magnetic body having four tapered parts facing the movable core, and the movable core has a tapered part facing the rotor that fits into the recess. The first yoke is configured with a cylindrical magnetic material, and the first yoke accommodates the rotor in a through hole provided in its center in a non-contact state, and the second yoke accommodates the rotor in a through hole provided in its center. The printing device according to claim (3), characterized in that the printing device has a structure in which a movable iron core is inserted through the movable core in a non-contact manner. (6) As a permanent magnet, use a cylindrical or ring-shaped magnet magnetized in the thickness direction, and one end face is joined to the lower face part of the first yoke, and the magnetized A ring-shaped core whose inner peripheral surface faces the outer periphery of the movable iron core with a required gap is joined to the other end surface. Device〇(6) The magnetic flux generating means is composed of one coil, and can shift the movable iron core from the first position to the second position and from the second position to the second position according to the direction of the current flowing through the coil. 3. The printing device according to claim 3, wherein the printing device is configured to perform a return operation to the first position.