JPS5931472B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device that performs a predetermined printing operation by striking printing paper against a type wheel, and particularly relates to a locking device that stops the type wheel at a predetermined position and selects type. The present invention relates to a printing device in which a lever is operated by a permanent magnet structure and an electromagnetic device.

A printing device that performs a predetermined printing operation by striking printing paper against a type wheel is provided with a locking lever that rotates in response to a print command and locks the type wheel at a predetermined rotational position.

This locking lever is normally biased by a spring in the negative direction, and is configured to be rotated in the opposite direction by an electromagnetic device. However, in this case, the electromagnetic device
Since the rotating member must have a large capacity to rotate against the spring, it has the drawback of high power consumption and high cost. In addition, if the capacity of the electromagnetic device is small compared to the elastic force of the spring, the operation will be uncertain.
It had the drawback of lacking reliability. This invention was made in view of the above circumstances, and its purpose is to use a permanent magnet structure and an electromagnetic device to operate a locking lever that stops the type wheel at a predetermined position and selects type. It is an object of the present invention to provide a printing device that is highly reliable, inexpensive, and has a simple configuration. An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

A support shaft 2 and a platen shaft 3 are rotatably mounted on the frame 1 in parallel with each other.

The spindle 2 reciprocates by l rotations for each printing operation, and the spindle 2 has a large number of disc-shaped type wheels 5 with types 4 on the outer periphery (as shown in the figure). (only one is shown) is rotatably supported. The platen shaft 3 has a platen 6 fixed thereon and is provided so as to be movable toward and away from the type ring 5 (FC) using a support groove 7 formed in the frame 1 as a guide.

A printing paper 8 is wrapped around the platen 6, and an ink ribbon 9 is interposed between the platen 6 and the type wheel 5.
A ratchet wheel 10 is integrally provided on one side of each type wheel 5.

This ratchet wheel 10 has a large number of set pawls 11... and one reset pawl 12 corresponding to each type character 4 on its outer periphery, and an annular groove 13 is provided on its {1j surface. A guide groove 14 extending toward the center is provided in a part of the groove 13. On the other hand, a V-groove 15 is formed in a part of the outer peripheral surface of the support shaft 2 in the axial direction. Further, a flat circular plate spring 16 is housed in the annular groove 13 . This plate spring 16 has one end rotatably supported on the bottom surface of the groove 13, and the other end bent toward the center to form a locking claw 17, which is passed through the guide groove 14 and attached to the support shaft 2. It is locked in the v-groove 15. Nato, the connecting claw 1 of the leaf spring 16
The tip of 7 is an inclined surface that slopes outward. A mounting plate 18 made of a non-magnetic material is located below the support shaft 2.
It is fixedly attached to the frame 1.

A magnetic plate 19 is horizontally disposed on the lower surface of the mounting plate 18, and a comb-shaped magnetic plate 20 is horizontally disposed below the magnetic plate 19. A permanent magnet 21 is interposed between the upper and lower magnetic plates 19, 20, and one end of each magnetic plate 19, 20 (the comb tooth side of the magnetic plate 20) represents each magnetism of the permanent magnet. ing. Furthermore, both of the magnetic plates 19 and 20 are magnetically saturated with respect to the permanent magnet 21. In the figure, reference numerals 22 and 22 are fixing members for fixing the other ends of both the magnetic plates 19 and 20 together, and these are also made of a magnetic material that is magnetically saturated with respect to the permanent magnet 21VC. Fixed member 2
2, 22, the permanent magnet 21 and the magnetic plates 19, 20 constitute a permanent magnet structure. One end of the magnetic plate 19 is a support shaft 23 formed in the shape of an IL rod, and a large number of locking levers 2 corresponding to the respective type wheels 5 are attached to this support shaft 23.
4... is the pivot button. Each of these locking levers 24 has one end as a locking pawl 25 that locks onto the setting pawl 11 of the ratchet wheel 10. The permanent magnet structure, the electromagnetic device, and the locking lever 24 are assembled as shown in FIGS. 3 and 4. One end of the magnetic plate 20 attracts the other end of the locking lever 24, and the locking lever 24 is held at a position where the locking pawl 25 is spaced apart from the ratchet wheel 10. In the figure, 26 is a guide body bent into a substantially U-shape, and this is attached to the upper and lower plates of the locking lever 24.
... have slits 27..., 28... into which the characters fit, and both ends are fixed to the frame 1. moreover,
A bracket 29 is attached to the frame 1 in the horizontal direction K, and a large number of leaf springs 30 are attached to the bracket 29 with one end of each fixed. 7. The free end of each leaf spring 30 is locked to one end of the locking lever 24, so that the locking pawl 17 of each locking lever 24 is pivoted toward the ratchet wheel 10. A solenoid coil 31 is wound around each comb tooth of the magnetic plate 20.

This solenoid coil 31 constitutes an electromagnetic device that is energized in response to a printing command and causes the permanent magnet structure to exert a counter-electromotive force, and has connection terminals 31a and 31b provided at both ends.
are inserted into connection holes 32a and 32b of a printed circuit board 31 arranged horizontally below the magnetic plate 20, and connected to a control circuit provided on the printed circuit board 2. At a position surrounding the lower end of the locking lever 24, an adsorption piece 33 having a U-shaped cross section is provided with its opening facing upward and one edge of the suction piece 33 in contact with one end of the lower surface of the magnetic plate 20 in a horizontal direction. It is located in This attraction piece 33 is attached to the permanent magnet 21.
It is magnetically saturated and forms part of the permanent magnet structure. The locking lever 24 can rotate between the other side edge of the adsorption piece 33 and one end of the magnetic plate 20. Further, a diode 34 is attached to the back surface of the printed circuit board 32, which acts as a spark killer. The frame 1 has a force shaft 3 located below the type wheel 5.
5 is pivotally connected to the support shaft 2, and a lever 36 as a return mechanism is attached to this shaft 35.

Next, the operation of this printing device will be explained. The printing device shown in this embodiment sequentially sets each type wheel 5 at a desired printing position, arranges the type 4 at a position facing the platen 6, and prints the type on the line of the type. This is a system in which a platen 6 is struck and a desired print is made on printing paper 8 wound around the platen 6. That is, when the lower end of the locking lever 24 is attracted to the magnetic plate 20 and the locking claw 25 is in the state shown in FIG. As a result, a motor (not shown) rotates, the camshaft 35 rotates half a rotation, the locking lever 24 is allowed to rotate, and the support shaft 2 rotates in the direction of arrow A.
Then, the rotational force of the support shaft 2 is transmitted to the ratchet wheel 10 through the leaf spring 16 that engages the locking pawl 17 in the V-groove 15.
, and the support shaft 2, claw holder 10, and type wheel 5 rotate together. Further, as the spindle 2 rotates, a detection device (not shown) is activated and an electric signal is emitted, a predetermined type (letters, numbers, symbols, etc.) is selected, and a current flows to the solenoid coil 31 at a predetermined timing. , generates a counter-electromotive force in the permanent magnet structure. As a result, the state of attraction of the magnetic plate 20 to the engagement lever 24 is released, and the engagement lever 24 is urged by the leaf spring 30 and rotated to the position shown in FIG. 2. In this case, the L lever 24 is
The lower end is suctioned and held inside the suction piece 33, and in this state, the locking pawl 25 comes to engage with any set pawl 11 of the ratchet wheel 10. By this, the ratchet wheel 10, that is, the type wheel 5
is forcibly stopped from rotating, but the support shaft 2 disengages the locking pawl 17 of the leaf spring 16 from the groove 15 and rotates further in the same direction. Each type wheel 5... is sequentially set at a desired printing position by an electrical signal, and the solenoid 31 corresponding to each type wheel is immediately de-energized, but each locking lever 24 is activated by a leaf spring. In addition to the action of 30, the do end contacts the other edge of the attraction piece 33, and a magnetic holding circuit as shown by the dotted line in FIG. 2 is formed via the attraction piece 33 and the engagement lever 24. Therefore, it is continuously held in the engagement position with respect to the ratchet wheel 101fC. Further, the type wheel, in which a type is not selected, rotates together with the support shaft 2 to a predetermined position.
In this way, each type wheel 5... is set at a desired printing position, and the platen 6 (F. The ink ribbon moves in five directions and hits the character row from above the ink ribbon 9, printing on the printing paper 8 wrapped around the platen 6. This state is shown in Fig. 2. When the printing operation is completed, the platen 6 returns to its original position, the support shaft 2 is reversed, and the cam shaft 35 rotates half a turn, causing the cam 36 to rotate integrally with the stiffener.
As a result, the lever 24 is returned to its original position against the elastic force of the leaf spring 30 and the suction force of the suction piece 33.

At this time, the locking pawl 25 of the locking lever 24 comes off from the set pawl 11 of the ratchet wheel 10, and the lower end of the locking lever 24 is again attracted and held by one end of the magnetic plate 20. Furthermore, when the support shaft 2 is reversed, when the V-groove 15 comes to a position opposite to the locking claw 17 of the leaf spring 16, the locking claw 17 is immersed in the V-groove 15 again, and from then on, the claw The east 10 and the type wheel 5 are inverted and returned together with the support shaft 2. When the set pawl 12 of the ratchet wheel 10 comes into contact with the locking pawl 25 of the locking lever 24, the ratchet wheel 10 and the type wheel 5 are stopped F to prepare for the next printing operation. Therefore, according to the above embodiment, the lever 24 is pivotally supported by one magnetic pole (one end of the magnetic plate 19) of the permanent magnet structure, and is supported by the other magnetic pole (one end of the magnetic plate 20) of the permanent magnet structure. That person 1
- The lower end of the lever 24 is held by suction, and the solenoid coil 31 is energized in response to a printing command to generate a counter-electromotive force in the permanent magnet structure.
4, and the locking pawl 25 of the locking lever 24 is engaged with the ratchet wheel 10.
Since the solenoid coil 31 is engaged with the set pawl 11 of the solenoid coil 31, a small capacity one is sufficient, and the time for energizing the coil 31 is extremely short.
It can reduce power consumption, is highly reliable, and can be manufactured at low cost. Further, the permanent magnet structure has an attraction piece 33 in a part thereof, and forms a magnetic holding circuit as shown by the dotted line in FIG. 2 via this attraction piece 33. When the lower end of the lever 24 comes into contact with the side edge of the suction piece 33, the lever 24 does not bounce and the ratchet wheel 10
It engages securely. Furthermore, the locking lever 24
Even in the reduced state shown in FIG. 1, the magnetic plate 20 is magnetically saturated with respect to the permanent magnet 21VC, so that it is always attracted and held at one end of the magnetic plate 20 with a constant force. Since the locking lever 24 is pivoted at one end (support shaft 23) of the magnetic plate 19, which is one of the magnetic poles of the permanent magnet structure, there is no need to provide another pivot shaft. The number can be reduced and the configuration can be simplified.

Further, since the lower magnetic plate 20 is formed into a comb-teeth shape and a solenoid coil 31 is wound around each comb-teeth, the magnetic plate 20 can be assembled as one piece. Moreover, in this case, since the solenoid coils 31 are arranged in a row, the stiffeners can be easily attached to each comb tooth of the magnetic plate 20 and the printed circuit board 32 in a state where they are arranged all at once and made into a block as shown in FIG. Can be incorporated. As described in detail above, the present invention uses a printing device VC which performs a predetermined printing operation by hitting printing paper against a type wheel, and the central part of the locking lever can be freely rotated by one magnetic pole of a permanent magnet. One end of this lever is locked to a set pawl provided corresponding to each type on the type wheel to select the type, and the other end of the locking lever is attracted to the other magnetic pole of the permanent magnet. Then, hold this lever in a position where it is removed from the set pawl, then connect an adsorption piece to the other magnetic pole of the permanent magnet, and use this adsorption piece to attract the other end of the locking lever to lock this lever to the set pawl. The locking lever is held in the matching position, and is further provided with a spring that biases the locking lever in the direction of engaging with the set claw, and a solenoid coil that generates a counter-electromotive force in the permanent magnet,
This makes it possible to provide a printing device that is highly reliable, inexpensive, and has a simple configuration.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention.
3 and 2 are side views, FIG. 3 is a partial perspective view, and FIG. 4 is an exploded perspective view of FIG. 3. 5... Type wheel, 8... Print paper, 19, 20... Magnetic body (permanent magnet structure), 21... Permanent magnet (permanent magnet structure), 22... Fixed member (permanent magnet structure) ), 33・
...Adsorption piece (permanent magnet structure), 24...Latching lever (
Rotating member), 30... Leaf spring, 31... Solenoid coil (electromagnetic device), 36... Cam (return mechanism).

Claims (1)

[Claims] 1. A rotatable type ring having a plurality of type characters on the outer periphery and coaxially equipped with a plurality of setting claws corresponding to name type characters, and a rotatable type ring made of a magnetic material with one end engaged with a predetermined set claw. A rotatable locking lever that stops and selects a predetermined type;
A platen contacts the predetermined type selected by this locking lever via printing paper, and one magnetic pole rotatably supports the center of the locking lever, and the other magnetic pole supports the locking lever. A permanent magnet that attracts the other end of the locking lever to hold it in a position away from the setting claw of the type wheel, and a permanent magnet that is connected to the other magnetic pole of this permanent magnet and attracts the other end of the locking lever. an adsorption piece made of a magnetic material that holds the locking lever of the lever in a position where it is engaged with the setting claw of the type wheel; a solenoid coil that is wound around the permanent magnet and generates a counter-electromotive force in the permanent magnet; A spring that constantly biases the locking lever in a direction to engage with the set claw of the type wheel, and a return mechanism that presses the lock lever and forcibly removes the lever from the set claw of the type wheel. A printing device characterized by: