JPS60120087A - Lift controller for printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (7) The invention erases the ink printed on the ink ribbon paper for printing. The present invention relates to a lifting control device that controls the lifting and lowering of printing positions Wtvr and tape separately.

Conventionally, in typewriters and the like that have an ink ribbon and a correction tape, the ink ribbon and the correction tape are usually positioned below the printing position so that the printing position can be seen, and the ink ribbon is used when printing. The correction tape was raised so as to face the printing position, and the correction tape was raised to face the printing position during printing correction. For example, it is known that there is a method described in Japanese Unexamined Patent Publication No. 56-161190, etc., which describes a control member having two cam tracks of different diameters (σ) having a common part. By rotating in the forward and reverse directions, when rotating in the forward direction, the sliding bottle connected to the support member holding the ink ribbon and correction tape is guided by one cam track with a larger diameter, and the ink ribbon faces the printing position. When the support member is rotated in the reverse direction, the bottle is guided by the other cam track with a smaller diameter, and the support member is raised lower so that the correction tape faces the printing position. I used to set it to 5 in the previous version, but the conventional one like this V
C has the following drawbacks: the manufacturing precision of the control part is low due to the formation of a complex-shaped cam track that has common parts and guides the bin in different directions depending on the direction of rotation. Otherwise, it is necessary to have strict precision in assembly with the bins and support members, which complicates the manufacturing process and reduces work efficiency. The rotation angle in the forward and reverse directions had to be widened, which increased the time it took to raise and lower the ink ribbon and sharpening tape (σ), which resulted in drawbacks such as a delay in the timing of the hammer operation and a slowdown in printing speed. .

The object of the present invention is to eliminate the drawbacks of the above-mentioned conventional devices.

An embodiment of the present invention will be described with reference to the drawings. In Fig. 1.2, 1 is a platen supported horizontally on the main body of a printing device (not shown) such as a typewriter, 2 is a platen 2 disposed along the platen 1 in front of it; A holding shaft 3 is fixed to the main machine frame, and side plates 3a and 3b are slidably fitted and supported in the axial direction with respect to the holding shaft 2, and are moved in the axial direction in conjunction with a driving body (not shown) such as a stepping motor. This is a carriage that can be stopped.

Reference numeral 4 denotes a box-shaped ribbon cartridge with a substantially U-shaped portion facing the platen 1 so that a printing member (not shown) such as a type holder (for example, a daisy wheel) and a hammer placed on the carriage 3 can be placed therein. It holds three cylindrical pulleys (not shown) that wind both ends of the ink ribbon inside so that they can rotate around a vertical axis, and the middle part of the ink ribbon passes outside the machine frame between the front edges of the image. This is a well-known guide to guide you through the process. 5 is ribbon cartridge 4
It is a flat plate-shaped holder (first effecting body) on which a machine can be placed, and it is rotated with respect to the three carriage frames in a horizontal bin 6.6 fixed to the protrusions 5a and 5a that project upward from both rear sides. A hole 5b is movably supported and formed vertically through the front part.
, 5b, the ribbon cartridge 4 is removably locked by both well-known means 7, 7 protruding from the ribbon cartridge 4. Reference numeral 8 denotes a support shaft rotatably supported at the intermediate portion of the holding body 5 and penetrating vertically, 9 is a ratchet wheel fixed to the lower end of the support shaft 8, and 1o is a support shaft 5 of the holding body 5.
A claw body 11 is rotatably supported on the tip of the bent portion 5c that is bent downward into an L-shape, and 11 is a cam of a cam body 12, which is fixed so as to be rotatable together with the claw body 10 and will be described later. It is a driven body that faces the surface with its tip facing the cam surface and always receives an elastic force that presses against the cam surface, and the pawl body 10 engages the teeth of the ratchet wheel 9 in relation to the swinging of the driven body j1 due to changes in the cam surface of the cam body 12. The support shaft 8, whose upper end is fitted to one of the pulley shafts in the ribbon cassette 4, rotates the pulley shaft and winds up the ink ribbon l(,).

13 + 13 is the side plate 3a, 31) of the carriage 3
A pair of working arms (first working arms) which are arranged outwardly, are individually supported at their rear ends so as to be rotatable about a support shaft 14 parallel to the holding shaft 2, and are connected by a support shaft 41. body), and its tip is an arm portion 13a.

13a and arm portions 13b, 13b form a bifurcated portion.

A support shaft 15.15 is supported at the base of the forked part so as to be rotatable about an axis parallel to the holding shaft 2, and a sprocket wheel 16 is fixed on one of the support shafts 15, and the teeth 1 on the outer periphery of the support shaft 15.
6a, the engaging body 17 is fixed to the carriage 3 machine frame,
Both support shafts 15.15 support pulleys 18.18 around which both ends of the correction ribbon tape T are wound. These are connected to the engaging body 17 in relation to the swinging of the working arm 13.13 as will be described later.
engages with the teeth 16a of the sprocket wheel 16, and one pulley 18 rotates to wind up the tape T. A guiding tool 19.19 for guiding the tape T is fixed to the upper arm 13a+138 of the forked part with a screw, and the tips of the lower arm 13b, 13b are bent into an L shape,
Eccentric screws 20 that can be screwed into the side plates 3a and 3b for adjustment
can be engaged with.

From the middle of each working arm 13*13, the side plate 3a (3b)-
L-shaped engaging portion 1'3c (13c) protruding inward
) faces below the L-shaped engaging portion 5d (5d) that protrudes downward from the tip of the holder 5 at a predetermined interval. As will be described later, this interval is set to 1 by the eccentric screw 20 so that the correction tape T and the ink ribbon 1t are aligned in the front and back as the working arm 13 is raised.

21 is a stepping motor fixed inside the carriage 3;
22 is a drive shaft of the stepping motor 21 (not shown)
23 is a support shaft rotatably supported around an axis parallel to the drive shaft of the stepping motor 21;
24 is a driven gear screwed onto the drive gear 22 fixed to one end of the support shaft 23, 25 is an operating gear fixed to the other end of the support shaft 23, and a gear 24, 25 is provided in the middle of the support shaft 23. The cam body 12, which has a large diameter portion 12a and a small diameter portion 12b, is fixed.

Reference numeral 26 denotes an operating shaft parallel to the support shaft 23 and rotatably supported on the carriage 3 machine frame; 27 is fixed to the operating shaft 26 and forms a stepped portion 28 whose intermediate portion protrudes in the radial direction;
5 is a control body provided with an operating gear part 28a that is screwed into
One end in the axial direction protrudes outward from holes provided in the side plates 3a and 3b. Although there are a pair of control bodies 27 on the left and right sides of the carriage 3, only one will be described and explained in the drawing.

An elongated hole 27a is formed in the control body 27 in the axial direction so that the left and right edges face each other across a perpendicular line passing through the axis along an upward semicircular arc centered on the axis of the operating shaft 26. Hole 2
Three cylindrical protrusions 29a and 29b protruding in the radial direction are provided on the outer peripheral surface on the opposite side of the axis from 7a. A well-known light detection means 30 consisting of a light emitting part and a light receiving part is fixed to the machine frame across the rotation path of the protrusions 27a and 27b. The detection means 30 corresponds to between the protrusions 29a and 29b when the control body 27 is in a steady state (FIG. 3), and corresponds to one protrusion when the correction tape T is facing the printing position (FIG. 4). 29
a, and corresponds to the position where the ink ribbon R passes the other protrusion 29b when it is facing the printing position (FIG. 5), and is related to the presence or absence of the protrusions 29a and 29b. Shading.

Generates a separate signal for each received light.

Reference numeral 31.32 denotes a connecting arm whose upper end is rotatably supported around an eccentric screw 33.34 having an axis parallel to the working shaft 26 at an intermediate portion between the holding body 5 and the working arm 13, and is supported by the holding body 5. One of the connecting arms 31 has a pin 35 fitted into the elongated hole 27a from the inner end of the carriage 3 of the control body 27 fixed at its lower end, and the other connecting arm 32 supported on the operating arm 13 is connected to the carriage 3 of the damping body 27. A pin 36 that fits into the elongated hole 27a from the outer end is fixed to the lower end. The connecting arm 31 always has the pin 35 inserted into the elongated hole 27a.
The connecting arm 32 always connects the pin 36 to the other end of the long hole 27a (the third It receives the elastic force of a coiled spring 38 that is locked to one end of the machine frame so as to be engaged with the machine frame (right end in the figure).

When not printing, the protrusion 29a is connected to the light detection means 30.

2? stepping motor 2 so that the space between b faces each other.
1 is controlled.

39 is a paper guide body that guides the paper (not shown) along the platen 1, and 4o is a correction tape T between the guide tools 19, 19.
This is a tape guide that guides the tape along the platen 1 at the printing position while sandwiching it between the paper guide member 40 and the paper guide member 40.

In the electric circuit shown in FIG. 6, KB is a keyboard that has various keys and generates various commands including printing commands and correction commands by key operation, and DM is a motor drive circuit that drives the stepping motor 21 to rotate forward or backward. , PS is a printing operation circuit that operates printing members such as character selection and hammer based on a printing command, and CP is a printing operation circuit that operates a motor drive circuit DM and a printing operation circuit PS based on signals from a keyboard KB and a detection means.・This is a control circuit that controls the

The present invention has the above-described configuration, and in a normal state without printing or correction of printing, the control body 27 has both ends of the elongated hole 27a located on the horizontal line, and the detection means 30 is located on both sides, as shown in FIG. Protrusion 29a.

29b, and the driven body 11 is engaged with the large diameter portion 12a of the cam body 120.

When a print command is issued from the keyboard KB in this state, an operation command is issued from the control circuit to the stepping motor 21 (motor drive circuit DM), which drives the drive gear 22 to rotate clockwise in FIG. A driven gear 24 screwed into the gear 22. The driven gear 24 and the working gear 25 on the same shaft 23 are rotated counterclockwise, and the working gear 25 is connected to the gear portion 2.
The control body 27 screwed into the control body 8a rotates clockwise. Kof
t, the cam body 12 that engages the driven body 11 has its small diameter portion 12b facing the engaged position, and the driven body 11 and the claw body 10 of the same size rotate clockwise in FIG. 3 to the position shown in FIG. As shown, the ratchet wheel 9 and the pulley of the ribbon cartridge 4 are connected to the ribbon R.
The ribbon is rotated so as to be wound up, and the ribbon is fed by the pitch of the claw portion 9a.

The pin 35, which is fitted into the elongated hole 27a and engaged with the left edge in FIG.

When the pin 35 moves following the edge and rises by the amount of vertical displacement due to the arc of the elongated hole 27a, the upper end of the connecting body 31 that supports the pin 35 moves the holder 5 to the pin corresponding to the amount of rise. 6 in the clockwise direction (Fig. 3). On the other hand, the pin 36 that engages with the right edge of the elongated hole 27a in FIG. Therefore, the third
It is maintained in the state shown in the figure. When the protrusion 29b passes through the detection position of the detection means 30 and once blocks the light, the outer end of the protrusion 29b faces and receives light again, the motor drive circuit 1) M is activated in relation to the light reception detection signal. act to stop the stepping motor 21. At this time, ribbon cartridge 4
The portion of the tip facing the platen 1 faces the printing position, activates the printing operation circuit PS, and starts printing (FIG. 5). When printing is completed, the control circuit CI) acts on the motor drive circuit DM to rotate the stepping motor 21 in the opposite direction, and in connection therewith, the control body 27 rotates counterclockwise (the fifth
), the holder 5 moves back due to the force of the coiled spring 37, and the projection 29b passes through the detection position of the detection means 30 and the inner edges thereof face each other in relation to the light reception signal. The stepping motor 21 is stopped at the initial position (FIG. 3).

When correcting printing, the motor drive circuit DM is actuated in conjunction with generation of a correction command from a correction key (not shown) on the keyboard KB, and the stepping motor 21 moves the drive gear 22 counterclockwise in FIG. Drive to rotate to
A driven gear 24 screwed into the drive gear 22 rotates the support shaft 23 clockwise, and the control body 27 is rotated counterclockwise via the working gear 25.

As the support shaft 23 rotates clockwise, the cam body 12 rotates in the same direction, but since the large diameter portion 12a is always engaged with the driven body 11, the claw body 10 does not swing, so ribbon feeding is not performed. do not have. When the control body 27 rotates counterclockwise, the elongated hole 2
When the pin 36 that engages with the right end edge of FIG. The upper end rotates the operating arm 13 clockwise (FIG. 3) about the support shaft 14 in accordance with the amount of rise thereof. At the beginning of the rotation, there is a vertical gap between the engaging part 13c of the working arm 13 and the engaging part 5d of the holder 5, so only the working arm 13 rotates, but at the later stage of the turning, both the engaging parts 13c and 5d of the holding body 5 rotate. The portions 5d and 13c are engaged, and the holding body 5 follows the working arm 13, and the correction tape T faces the front of the ink ribbon R due to the above-mentioned interval. When the protrusion 29a passes the detection position of the detection means 30 and once blocks light, the outer ends of the protrusion 29a face each other and receive light again, that is, the correction tape T and the ink ribbon R face the printing position. At this time, the stepping motor 21 is stopped in response to the light reception detection signal from the detection means 30 (FIG. 4). Then, the printing means acts, and the type hammer is pressed to overlap the print via the ink ribbon R and the correction tape T, thereby erasing the print. Once completed, the stepping motor 21 rotates in the opposite direction, and the control body 2
7 rotates clockwise (FIG. 4) in the opposite direction to that described above, and the operating arm 13 moves back due to the acting force of the coiled spring 38.
The stepping motor 21 is stopped at the initial position (FIG. 3) in response to a light reception signal when the protrusion 29a passes through the zero detection position and the inner edges thereof face each other. Due to the backward movement of the working arm 13, the engaging body 17 is attached to the toothed portion 16a of the ratchet wheel 16 at the tip.
engages, and one pitch of tape feeding is performed.

When the eccentric screw 20 is screwed in and adjusted, the diameter of the outer peripheral surface that the arm portion 13b of the working arm 13 engages changes, raising and lowering the arm portion 13b, and slightly rotating the working arm 13 to hold it with the engaging portion 13C. The distance between the body 5 and the engaging portion 5d is adjusted.

Further, by screwing in and adjusting the eccentric screws 33 and 34, the raised position of the holder 5 or the working arm 13 is adjusted so that the ink ribbon R or the correction tape T reliably faces the printing position.

In this embodiment, one elongated hole 27a is provided in the control body 27 so that the left and right edges face each other across a perpendicular line passing through the center of rotation, but as shown in FIG. Separate long holes 50a on the top.

sob, and both connectors (
Insert the pins 35 and 36 of 31 and 32) separately, wrap the pin 35 around the left edge of one long hole 50'a and press it with the spring 37, and wrap the pin 36 around the right edge of the other long hole 50b. 38 may be set to press, and the control body 27 may be rotationally controlled in the same manner as in this embodiment.

Similarly, as shown in Fig. 8, elongated holes 51 and 52 are formed on different arcs around the axis of the operating shaft 26, that is, the center of rotation of the control body 270, and both elongated holes 51 and 52 are formed in the measuring holes 51 and 52. Connector (
The control body 27 may be rotated by inserting the pins 35 and 36 (31, 32) separately and pressing them against the left or right edge by the action of a coiled spring in the same manner as described above. In addition, in this embodiment, the control body 27 has three cylindrical protrusions 2.
9a.

29b, and both protrusions 29 are provided at the detection position of the detection means 30.
When a and 29b face each other, or one protrusion 29
Although the example in which the driving stop of the stepping motor 21 is controlled by the related detection signal when the outer edge of the outer edge of the outer edge a or the outer edge of the other protrusion 29b is opposed to each other is shown, a single protrusion is provided, The origin is when the protrusion faces the detection position.
That is, the state shown in FIG. 3 may be set, and each operating position shown in FIG. 4.5 may be detected based on the count value of pulses after passing both ends of the protrusion, and the stepping motor may be stopped.

Furthermore, in this embodiment, when the correction tape T is raised to the printing position, each engaging portion 13c of the working arm 13 and the holding body 5,
5d, the ink ribbon It also rises to the printing position, but it is also possible to make only the correction tape T face the printing position with the ink ribbon It in the downward position. Here, the driven body 11 is a cam that engages with the large diameter portion 12a of the cam body 12 so that the ink ribbon R (holding body 5) is not fed when the ink ribbon R (holding body 5) moves up and down in conjunction with the up and down movement of the correction tape T. Although the body 12 has a cam shape, the ink ribbon 1 may also be slightly fed at this time. That is, when printing by rotating only the holding body 5, the rotation of the ratchet wheel 9 by the claw body 10 following the cam body 12 is made several pitches of the tooth portion 9a, and the working arm 1
By rotating the ratchet wheel 9 by a pitch smaller than that during the correction by the rotation in step 3, the ink ribbon IL can be fed at a smaller pitch during correction than during printing.

In addition, in this embodiment, the ink ribbon R is moved up and down between two positions from the lower position to the upper position during printing, but from the state shown in FIG. By rotating the ink ribbon R in several steps, the entire width of the ink ribbon R can be used in the vertical direction. That is, for example, during the first printing, the rotational position of the control body 27 (stepping motor 21) is set to the first stage so that the printing position is near the bottom end of the ink ribbon, and during the next printing, the rotation position is set in the vertical direction of the ink ribbon. The rotational position of the control body 27 is set to the second stage so that the printing position is near the middle, and the rotational position of the control body 27 is set to the third stage so that the printing position is near the top end of the ink ribbon at the next printing. Then, this operation may be repeated thereafter, or similarly, it may be repeated including an operation of sequentially returning to the first stage for each print.

As described above, according to the present invention, I! 1. lJ
The control body 2'l is movably supported on the machine frame and has a long hole formed on an arc with its own rotation = scarlet as the center, and the upper end is turned into the first effecting body or the second effecting body, respectively. ! A pair of connecting bodies 81.32 and a control body are connected to a pair of connecting bodies 81 and 32, which are rotatably supported around an axis parallel to the IqlI line, and have a bottle loosely fitted in a long hole at the lower end K, parallel to the axis indicated by J. The driving body 21 is capable of forward and reverse rotation, and when the control body is rotated in one direction, the elongated hole pushes up one bottle so that at least one of the working bodies is in the upper position, and when the control body is rotated in the other direction, at least the other bottle is pushed up. ) The long hole pushes up the bottle so that the second effecting body is in the upper position, and when the second effecting body moves up, both protrusions engage and the ink ribbon and correction tape face the printing position. By making the first acting body move upward and upward, the ink ribbon and correction tape can be easily rotated forward and backward by simply rotating the single control body, which has a long hole (σ), on a circular arc centered on the center of rotation. and Φ so that each can be raised to the printing position separately? Since the shape of the ff1J body and the structure of the device are simplified, manufacturing and assembly becomes extremely easy, and the rotation angle of the control body can be made small because the rotation of the control body is only required to raise the ink ribbon and correction tape. Because of this, it does not take much time to raise and lower the ribbon or tape, and the hammer operation timing can be accelerated to increase the printing speed.

Also, when the correction tape rises, G! The first action body can be raised so as to overlap the correction tape at the ink ribbon l printing position, so when the printed characters are pressed against the platen through the correction tape for correction, the ink ribbon acts as an intervening force against the correction tape. Since the suppression area is widened and can completely overlap the printed area, the printed area can be erased cleanly and the quality can be improved.

[Brief explanation of drawings]

Figure 1 is a perspective view of the carriage exterior of this embodiment, Figure 2 is a perspective view of the lifting mechanism inside the carriage, and Figure 3 is at rest (normal).
Fig. 4 is a side view of the elevating control mechanism during correction, Fig. 5 is a side view of the elevating control mechanism during printing, Fig. 6 is a block diagram of the electric circuit, Fig. 7. is control body 2
7 is a side view of the second embodiment of the control body 27, and FIG. 8 is a side view of the second embodiment of the control body 27. Applicant's name: Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

[Scope of Claims] Printing means that presses type characters to be printed against a platen facing the printing position; and a printing means that holds an ink ribbon so as to be able to be transferred along the platen, and an ink ribbon positioned above the printing position and below the printing position. A first effecting body 4, 5 is provided with a protrusion 5d that is rotatably supported on the machine frame around a horizontal axis and protrudes in the horizontal direction, and a correction tape portion I? The correction tape is held so that it can be moved along the tenth scale, and the correction tape is supported rotatably relative to the machine frame about a horizontal axis at an upper position opposite to the printing position and a lowered position located below the printing position. The second effecting bodies 13 and 8 are provided with protrusions 13C that protrude in the horizontal direction and are opposed to each other below the protrusions of the machine frame. a control body 27 supported by the control body 27 and having a long hole formed on an arc centered on the rotation axis of the control body 27;
A pair, the upper end of which is separately supported by a first effector or a second effector so as to be rotatable around an axis parallel to the rotational axis, and a bottle parallel to the axis and loosely fitted into a long hole is fixed to the lower end. The connecting bodies 81 and 82 and the driving body 211 which is connected to the control body and capable of forward and reverse rotation are connected, and the elongated hole is aligned so that at least one of the effecting bodies is placed in an upper position when the control body is rotated in one direction. 0) By pushing up the bottle and rotating it in the other direction, the elongated hole pushes up the other bottle so that it is at least above the other acting body, and as the second acting body rises, both protrusions lock together. A lift control bag for a printing device #, characterized in that the first effecting body is raised so that the ink ribbon and the correction tape face the printing position;