JPS62111748A - printing device - Google Patents

Abstract

PURPOSE:To prevent a pressing means from being broken due to a blank strike or the spokes of a type wheel from being damaged because of a strike upon the spokes by the pressing means by inhibiting the action of the pressing means when the coupler of a drive means which drives the type wheel and the type wheel are connected insufficiently. CONSTITUTION:As long as a first flag region 111 and a second flag region 113 are set, CPU 91 decides that a wheel cassette 47 is completely attached to a cassette holder 39 and a coupler and a type wheel 53 are kept in a connected state. Then said CPU actuates a printing hammer device to execute printing action. When printing data are input in such a condition that the cassette holder 39 has tilted toward a type selector motor side, CPU 91 refers to the first flag region 111 and the second flag region 113 ahead of printing action. In this case, the first flag region 111 is set by the attachment of the wheel cassette 47 to the cassette holder 39, and the second flag region 113 is in a reset state became the cassette holder 39 is inclined to a type selector motor side. For this reason, CPU 91 decides that the coupler and the type wheel 53 are not attached to each other, and the action of the printing hammer device should be inhibited to stop printing action.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device for printing with a petal-shaped type wheel.

[Prior Art] The conventional printing device disclosed in Japanese Patent Application Laid-Open No. 57-51469 uses a carriage that moves step by step parallel to the printing lines on the platen in order to easily replace the wheel cassette in which the type wheel is housed. On the other hand, the type selection motor is supported so as to be movable in two forward directions perpendicular to the axis of the platen, and the cassette holder to which the wheel cassette is attached is supported so as to be tiltable from a substantially vertical position toward the type selection motor.

After the wheel cassette is mounted on the cassette holder, the cassette holder is erected in a substantially vertical position by engaging the rotating shaft of the type selection motor with the type wheel based on the movement of the type selection motor. This sets the pressing means and the type at a required distance.

[Problems to be Solved by the Invention] However, the above-mentioned conventional printing device has a type selection motor,
When the printing cover covering the upper part of various types of printing 11 such as a type wheel is opened, the operation of the pressing means is prohibited and the printing operation is interrupted. However, even if the type selection motor continues to move forward away from the platen, and therefore the cassette holder to which the wheel cassette is attached remains tilted toward the type selection motor, the print cover is closed and printing is not possible. Once data was input, printing was performed. For this reason, the pressing means is operated when the pressing means and the type are not facing each other with the required spacing, which not only causes printing errors but also damages the pressing means due to so-called blank running. Also, there was a problem in that the pressing means struck the spokes of the type wheel and damaged the spokes.

[Object of the Invention] In view of the above-mentioned conventional drawbacks, an object of the present invention is to prohibit the operation of the pressing means when the coupling part of the drive means for driving the type wheel and the type wheel are incompletely engaged. The object of the present invention is to provide a printing device with excellent durability.

[Means for Solving the Problems] Therefore, the present invention provides a detecting means for detecting whether or not the positional relationship between the connecting portion of the drive means and the type wheel is maintained in an engaged state. The printing device is configured by providing a prohibition means for prohibiting the operation of the hammer means when it is detected that the positional relationship with the wheel is not maintained in the engaged state.

[Operation of the Invention] Since the present invention is configured as described above, the detection means detects whether or not the connecting portion of the driving means for driving the type wheel and the type wheel are held in an engaged state, and The operation of the pressing means is prohibited when the pressing means is not held in the engaged state.

[Example code] An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an exploded perspective view showing the printing part 1a of the printing device according to the present invention, Fig. 2 is a side view of the printing mechanism equipped with a wheel cassette, and Fig. 3 is a vertical sectional view of the printing mechanism at the center of the road body. A platen 3 (not shown in FIG. 1) is rotatably supported between frames (not shown) of the printing device 1. A platen drive motor 125 (shown in FIG. 4) such as a DC motor or a step motor is connected to the platen 3, and the platen 3 is driven by the platen drive motor 125.
rotates in a required direction to feed printing paper (not shown) mounted on the platen 3. Two guide shafts 5 are horizontally suspended between the frames parallel to the axis of the platen 3. A carriage 7 is supported on the guide shaft 5 so as to be slidable in the axial direction of the guide shaft 5 . A carriage drive motor 129 (shown in FIG. 4) such as a DC motor or a step motor is connected to the carriage 7, and the carriage 7 is driven by the carriage 7 in steps one character at a time in the axial direction of the guide shaft 5. moved forward.

On the carriage 7, a pair of left and right guide rails 9, one end of which is bent upward, are opposed to each other with a required interval,
Moreover, it is fixed so as to face in a direction perpendicular to the axis of the guide shaft 5.

A notch 9b is formed in the bent portion 9a of the guide rail 9 in accordance with the movement width of the type selection motor 31 in the front-rear direction perpendicular to the axis of the guide shaft 5. The guide rail 9 is provided with a support frame 13 whose both ends are bent upward.
However, a notch (not shown) formed in the bent portion 13a
and the notch 9b of the guide rail 9 via a steel ball 15 so as to be slidable in a direction orthogonal to the axis of the guide shaft 5. One bent portion 1 in the support frame 13
A support shaft 17 is fixed to the upper part of 3a, and a locking lever 19, which constitutes a part of the holding means, is rotatably supported on this support shaft 17. This locking lever 19 is integrally formed with a locking portion 19b at its intermediate portion and a suppressing portion 19c at its tip. In addition, the locking lever 19 has one end with a bent portion 1.
The other end of the tension spring 21 that is hooked to 3a is hooked.

As a result, the locking lever 19 is urged to rotate clockwise about the support @17 by the elastic force of the tension spring 21. Further, an operating lever 23 is rotatably supported on the support shaft 17 between the locking lever 19 and a side surface of a type selection motor 31, which will be described later. This operating lever 23
An arc-shaped long hole 23a is formed in the middle part of the long hole 2.
3a is a bin 2 fixed to the side of the type selection motor 31;
5 is slidably supported. This bin 25 restricts the rotation range of the operating lever 23. Also, operation lever 2
3 is integrally formed with an engaging portion 23b so as to engage with the locking lever 19. A support pin 27 is fixed to the bent portion 9a of the guide rail 9, and a wire spring is attached to the support pin 27, one end of which is hooked to the bent portion 9a, and the other end of which is hooked to the support shaft 17. Two are supported. This wire spring 29 urges the type selection motor 31 forward away from the platen 3 by its elastic force.

The support frame 13 is provided with a type selection motor 3 as a driving means.
1 is fixed. As a result, the type selection motor 3
1 is perpendicular to the axis of the guide shaft 5 on the carriage 7 and is moved toward the rear toward the platen 3 or toward the front away from the platen 3. Rotating shaft 3 of type selection motor 31
A connecting portion 33 is fixed to 1a. This connecting part 33
At the rear end, there is a head 33 having a substantially hexagonal cross section in the axial direction.
A shaft portion 33b having a diameter of 1.a and a flange portion 33d having a notch 33C in a part of one periphery are integrally formed.

A fixing plate 35 is fixed to the platen 3 side of the carriage 7. This fixed plate 35 has an opening 35a facing the type selection motor 31, a support part 35b that supports the wheel cassette 47 at the upper ends of both sides, and a hook that protrudes toward the platen 3 and is bent downward at the middle part of the upper end. The locking portion 35d engages the locking portion 35c and the locking portion 19b of the locking lever 19.
and a shaft support 35e that protrudes toward the platen 3 at the lower ends of both sides.
are integrally formed. The lock lever lever 9 and the rotating shaft 31a of the type selection motor 31 pass through the opening 35a. Further, a micro switch 37 as a detection means is provided on the rear surface of the hooking portion 35c (the surface facing the platen 3).
is installed.

A cassette holder 39 is attached to the shaft support 35e of the fixed plate 35.
However, the type selection motor 31 is moved from the vertical position by the shaft pin 41.
It is supported so that it can be tilted to the side.

These three cassette holders are composed of a rear wall 39a on the side of the platen 3, a front wall 39b on the side of the type selection motor 31, a side wall 39c, and a lower wall 39d.

A latched portion 39e is integrally formed on the upper portion of the front wall 39b so as to be engageable with the latched portion 35c. front wall 3
A through hole 39f is formed in the center of 9b so that a flange portion 33d can enter and exit the three cassette holders. In addition, one end of the front wall 39b is attached to the middle part of the operating lever 23.
) The other end of the locked tension spring 43 is locked. The tension spring 43 biases the cassette holder 39 toward the fixed plate 35 by its elastic force. A pair of locking protrusions 39G are integrally formed at the upper end of the rear wall 398 in accordance with the height of the shaft portion 33b. A microswitch 45 is attached to the upper surface of the lower wall 39d. When the wheel cassette 47 is installed in the three cassette holders, this micro switch 45 is turned on and the cassette holder 3
The mounting state of the wheel cassette 47 relative to the wheel cassette 47 is detected.

As shown in FIG. 1, the wheel cassette 47 accommodated in the three cassette holders has a substantially circular accommodation recess 49.
It consists of a bottom plate 49 on the right side of a, and an upper part 151 that covers the lower half of this bottom plate 49. An operation recess 49 for pinching the wheel force set 1-47 is provided at the upper edge of the bottom plate 49.
b is provided. A notch opening 49C is formed at the center of the upper edge of the four bottom plates, and a striking portion 77a of a printing hammer device 77, which will be described later, enters into the wheel cassette 47 through the notch opening 49c. An opening 49d is formed in the center of the four bottom plates, and the flange portion 33d is inserted into the wheel cassette 47 through the opening 49d.

A circular window 51 a is formed in the upper lid 51 so as to correspond to the center of the bottom plate 49 . Further, a tongue piece 51b whose tip extends toward the circular window 51a is integrally formed at the lower end of the upper lid 51, and a substantially circular-shaped protrusion 51c is integrally formed on the inner surface of the tip of the tongue piece 51b. .

The type wheel 53 housed in the wheel cassette 47 has a central hub portion 55 and a 11
A large number of spoke portions 57 extending in the i-ray direction and type letters 59 installed at the tips of the spoke portions 57 are integrally molded from synthetic resin. A cap 61 is fixed to the platen 3 side of the hub portion 55, which functions together with the hub portion 55 as a hub portion of the type wheel 53. A through hole 55a is formed in the center of the hub portion 55 with an inner diameter corresponding to the shaft portion 33b. Further, a d through hole 61a is formed in the center of the cap 61 with an inner diameter corresponding to the head 33a. A wire spring (not shown) bent in a 0-shape is attached between the hub portion 55 and the cap 61 so as to cross the through hole 61a. and the d
When the head 33a of the shaft portion 33b enters the through hole 61a, the maximum diameter portion of the head 33a is hooked between both arms of the wire spring.

A recess 65 is formed on the platen 3 side of the hub portion 55, and an insertion hole 67 is formed between the inner bottom surface of the recess 65 and the front surface of the hub portion 55, parallel to the axis of the shaft portion 33t). Further, the cap 61 has a recess 69 .
5, and an insertion hole 71 is formed between the inner bottom surface of the recess 69 and the rear surface of the 1-yap 61 so as to correspond to the insertion hole 67. A working pin 73, which is one of the holding means, is supported in the insertion holes 67 and 71 so as to be movable in the front and rear directions. A locking protrusion 73a is formed around the axis on the outer periphery of the intermediate portion of the working bottle 73.
．． 3 a is hooked to the inner bottom surface of the recess 65 . Further, a compression spring 75 is attached to the action bottle 73 between the latching protrusion and the inner bottom surface of the recess 69 .

This compression spring 75 urges the working bottle 73 forward by its elastic force. This action bin 73 is opened by the notch 33 due to the rotation of the connecting portion 33 as the type selection motor 31 is driven.
c. In addition, other configurations of the type wheel 53 and the three cassette holders, and the connecting portion 33 and type wheel 5
3 and the like are described in detail in Japanese Patent Laid-Open No. 57-51469, so a detailed explanation thereof will be omitted.

A printing hammer device 77 as a pressing means is provided on the upper part of the type selection motor 31, and its striking portion 77a is inserted into the notch opening 4 against the type 59 of the vertically erected type wheel 53.
9c and are fixed so as to face each other at a required interval. A ribbon cassette 79 (indicated by a dot f1 line in FIG. 2) is removably attached to the carriage 7, and inside the ribbon cassette 79 there are provided a plurality of printing bands in the width direction as a printing medium. Printing ribbon 81 (second
(shown with a dashed line in the figure) is folded and stored. The printing ribbon 81 is stretched approximately parallel to the platen 3 between the platen 3 and the five type characters.

FIG. 4 shows an electrical block diagram of the printing device 1 configured as described above. An external device 93 such as a keyboard or computer is connected to the CPU 91 via an interface 95, and various print data are received from the external device 93. is input. A microswitch 37 is connected to the CPU 91, and a ';52 flag area 113, which will be described later, is set based on an electrical signal output from the microswitch 37 when the three cassette holders are fully erected.

A microswitch 45 is connected to the CPU 91,
When the wheel cassette 47 is mounted on the cassette holder 39, a first flag area 111, which will be described later, is set based on an electrical signal output from the microswitch 45. A ROM 97 and a RAM 99 are connected to the CPU 91.

This ROM 97 has a main program area 101, a prohibited program area 103, and a type data area 105. This main program area 101 stores main program data for executing printing operations. In the prohibited program area 103, when the three cassette holders are tilted toward the type selection motor 31 and the connecting portion 33 and the type wheel 53 are not engaged, or when the wheel cassette 47 is not attached to the cassette boulder 39, Prohibition program data for prohibiting the operation of the printing hammer device 77 is stored.

The type data area 105 includes selection data for selectively rotating the desired type 59 to the printing position by driving the type selection motor 31 a required number of steps and the type 59 rotated to the printing position. Printing hammer device 7 with a striking force according to
Various type data such as impact data for driving 7 is stored. The RAM 99 has an input buffer area 107, a print buffer area 109, and first and second flag areas 111 and 113. The input buffer area 107 stores various print data input from the external device 93. When print start data is input from the external device 93, print 1 to buffer areas 109 store type data transferred from the type data area 105 based on the print data stored in the input buffer area [107]. . Said first flag area 11
1 is set based on an electric signal from the microswitch 45 when the wheel cassette 47 is loaded into the cassette holder 39. Further, the second flag area 113 is a cassette holder 39 to which a wheel cassette 47 is attached.
When the microswitch 3 stands up completely vertically,
It is set based on the electrical signal from 7. Said CPU
A ribbon lift drive circuit 115 is connected to the ribbon lift drive circuit 91, and the ribbon lift motor 11 is connected to the ribbon lift drive circuit 115.
7 is connected. And ribbon lift drive circuit 11
5 drives the ribbon lift motor 117 a required number of steps for each printing operation to move the ribbon guide (not shown) up and down between the printing position and a rest position located below it. A ribbon drive circuit 119 is connected to the CPU 9 i, and a ribbon feed motor 121 is connected to the ribbon drive circuit 119. This ribbon drive circuit 119
For each printing operation, the ribbon feed motor 121 is driven according to the width of one character, and the printing ribbon 81 is fed one character at a time. The CPU 91 includes a platen drive circuit 12.
3 is connected to the platen drive circuit 123, and a platen drive motor 125 is connected to the platen drive circuit 123. The platen drive circuit 123 drives the platen drive motor 125 based on paper feeding data to rotate the platen 3 in a desired direction, thereby feeding the printing paper mounted on the platen 3.

A carriage drive circuit 127 is connected to the CPU 91.
A carriage drive motor 129 is connected to the carriage drive circuit 127. This carriage drive circuit 12
7 drives 12 carriage drive motors in accordance with the width of one character for each printing operation, and moves the carriage 7 step by step by one character.

A type selection drive circuit 131 is connected to the CPU 91, and a type selection motor 31 is connected to the type selection drive circuit 131. The type selection drive circuit 131 drives the type selection motor 31 by a required number of steps based on the type selection data transferred from the print buffer area 109, and selectively rotates the desired type 59 to the printing position. A print hammer drive circuit 133 is connected to the CPU 91, and a print hammer device 77 is connected to the print hammer drive circuit 133. The print hammer drive circuit 133 drives the print hammer device 77 based on the impact data transferred from the print buffer area 109, and hits the type 59 rotated to the print position with a required impact force.

Next, the wheel cassette 4 containing the type wheel 53
7 to the printing device 1 is shown in FIGS. 2, 3, and 5.
The explanation will be given according to the figures and Fig. 7J56.

In FIG. 5 showing the state in which the wheel cassette 47 is not attached to the cassette holder 39, for example, the power switch (
When the wheel cassette 47 is attached to the three cassette holders with the wheel cassette (not shown) inserted, when the operating lever 23 is moved forward against the elastic force of the tension spring 43, the operating lever 23 Locking lever 1 engaged with engaging portion 23b
9 is rotated counterclockwise about the support shaft 17 against the elastic force of the tension spring 21. As a result, the locking portion 19b
Since the engagement with the locking portion 35d is released, the type selection motor 31 slides on the guide rail 9 by the elastic horn of the wire spring 29 and is moved forward away from the platen 3. Further, the cassette holder 39 tilts counterclockwise about the shaft pin 41 due to the elastic force of the tension spring 43, and the front wall 39b of the cassette holder 39 comes into contact with the microswitch 37 attached to the hook part 35c. . As a result, the microswitch 37 is turned off, for example.
The CPU 91 resets the second flag area 113. Further, since the cassette holder 39 is not attached to the wheel cassette 47, the lower wall 39 of the cassette holder 39
The microswitch 45 attached to d is turned off. At this time, the first flag area [111 has been reset.

In FIG. 2 and FIG. 6 showing the state in which the wheel cassette 47 is attached to the seat holder 39, the tilting force is
As shown in the figure, the wheel cassette 47 containing the type wheel 53 is placed against the tilted cassette holder 39.
Insert so that the tongue piece 51b is positioned on the platen 3 side.

At this time, the microswitch 45 attached to the lower wall 39d of the cassette holder 39 is turned on by the insertion of the wheel cassette 47. Thereby, the CPU 91 detects that the wheel cassette 47 is attached to the cassette holder 39 based on the electric signal from the microswitch 45, and sets the first flag area 111. and the sixth
When the operating lever 23 is moved backward from the state shown in the figure, the type selection motor 31 approaches the platen 3 through the pin 25 located at the left end of the elongated hole 23a as shown in the figure, while resisting the elastic force of the two wire springs. is moved in the opposite direction. As the type selection motor 31 moves, the shaft portion 33b of the connecting portion 33, which has been maintained at the position shown in FIG. Enter 49d and type wheel 5
It begins to engage with the through hole 55a of No.3. When the operating lever 23 is moved further rearward in this state, the cassette holder 39 is pressed against the tension spring 43 by the pressing portion 19C of the locking lever 19.
The latched portion 39e is moved against the latching portion 39e until it latches with the latching portion 35c. And the locking part 19b of the locking lever 19
is located in a state where it can be locked with the locking portion 35d of the fixed plate 35, and the locked state is immediately established by the biasing force of the tension spring 21. In this state, the three cassette holders stand completely vertically, and the moving state of the type selection motor 31 in the front-rear direction is maintained. At this time, if the relative positions of the notch 33C of the flange portion 33d and the working bin 73 of the type wheel 53 match as shown in FIG. 33c and the working bottle 73 are engaged, and the connecting portion 3
3 and the type wheel 53 are positioned. On the other hand, if the relative positions of the notch 33c and the working bottle 73 do not match, the front end of the working bottle 73 is in contact with the rear surface of the flange portion 33d. Further, when the locking portion 19b and the locked portion 35d are locked due to rearward movement of the operating lever 23 and the cassette holder 39 stands up completely vertically, the microswitch 37 and the cassette holder 39 are front wall 3
Since the contact with 9b is released, the microswitch 37
transitions from the OFF state to the ON state. This allows C.P.
U91 detects the completely erected state of the cassette holder 39 and sets the second flag area 113.

In the above state, type selection motor 31, wheel cassette 4
7. When the printing cover (not shown) covering the upper part of the printing mechanism such as the printing hammer device 77 is closed, the CPU 91 drives the type selection motor 31 to rotate the connecting part 33 at the required rotation speed.
Rotate. As a result, the working pin 73 of the type wheel 53 engages with the notch 33C of the connecting portion 33, and the connecting portion 3
3 and the type wheel 53 are positioned.

When print data is input in the above state, the CPU 91 refers to the first flag area 111 and the second flag area 113 prior to the printing operation. and the first flag area 1
11 and the second flag area 113 are both set, the CPU 91 determines that the wheel cassette 47 is completely attached to the cullet holder 39 and the j1
3 and the type wheel 53 are held in an engaged state, and the printing hammer device 77 is operated to execute a printing operation.

On the other hand, as shown in FIG. 6, when print data is input after the print cover is closed with the three cassette holders to which the wheel cassettes 47 are attached tilted toward the type selection motor 31, the CPU 91 performs the above operations. Similarly, the first flag area 111 and the second flag area 113 are referred to prior to the printing operation. In this case, cassette holder 3
The first flag area 111 is set by attaching the wheel cassette 47 to the cassette holder 3.
9 is tilted toward the type selection motor 31 side, the second flag area 113 is in the reset state. Therefore, the CPU 91 determines that the connecting portion 33 and the type wheel 53 are not engaged, and prohibits the operation of the printing hammer device 77 so that no printing operation is performed.

In this way, in this embodiment, the wheel cassette 47 is securely attached to the three cassette holders based on the electric signals from the microswitches 37 and 45, and the connecting portion 33 and the type wheel 53 are engaged. By prohibiting the operation of the printing hammer device 77 except when both the first flag area 111 and the second flag area 113 are set, the so-called jamming of the printing hammer device 77 can be prevented. This prevents incorrect printing, damage to the printing hammer device 77, or damage to the spoke portions 57.

[Effects of the Invention] As described above, the present invention provides a pressing means that presses the type on the type wheel toward the print medium when the positional relationship between the connecting portion of the drive means and the type wheel is not maintained in an engaged state. It is possible to provide a printing device with excellent durability by prohibiting this operation.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the main parts of the printing mechanism of a printing device according to the present invention, FIG. 2 is a side view of the printing mechanism with a wheel cassette attached, and FIG. 3 is a central vertical sectional view of the printing mechanism.
Figure 4 is an electrical block diagram of the printing device, Figures 5 and 6
The figure is a side view showing the effect. In the figure, 1 is a printing device, 19 is a lock lever that constitutes a part of the holding means, 31 is a type selection motor that constitutes a drive means,
33 is a connecting portion, 37 is a microswitch as a detection means, 53 is a type wheel, 59 is a type, 73 is a working pin forming a part of a holding means, 77 is a printing hammer device as a pressing means, 81 is a printing medium It is a printing ribbon.

Claims (1)

[Claims] (1) A printing device having a removable type wheel, a driving means for positioning a desired type on the type wheel to a printing position, and a pressing means for pressing the type toward a printing medium, the driving means a connecting portion that is provided in and capable of engaging with the type wheel; holding means that maintains a positional relationship between the connecting portion and the type wheel in an engaged state; and a prohibition means for prohibiting the operation of the pressing means when the detection means detects that the positional relationship is not maintained in the engaged state. printing device.