JPH0235491Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention supplies printing signals to the printing head supported on the carriage via a flexible cable, and prints while reciprocating the carriage along the printing line direction of the platen. The present invention relates to a printing device that prints on printing paper on a platen using a head.

Purpose The purpose of this invention is to be able to reliably assemble and fix a toothed belt and a flexible cable to a carriage using one holding member, and to easily attach the holding member to the carriage. The purpose is to provide a new printing device.

Configuration In order to achieve the above-mentioned object, this invention has a toothed belt stretched so as to have a running part that reciprocates parallel to the print line direction of the platen, and a toothed belt that crosses the running part of the toothed belt from below. An engaging tooth portion is formed on the carriage so that the teeth of the toothed belt face each other from above, and a pressing member is supported on the carriage so that the toothed belt engages with the engaging tooth portion. When attaching to the carriage, the flexible cable is positioned between the toothed belt and the holding member, and the flexible cable and the toothed belt are sandwiched between the holding member and the carriage. .

Embodiment Hereinafter, an embodiment embodying this invention will be described based on the drawings.

As shown in FIG. 1, a platen 2 extending left and right is supported at the rear of a frame 1 of the printing device so as to be rotatably driven by a motor 3. As shown in FIG. In front of the platen 2, a metal front wall plate 5 having a bent portion 5a at the upper end is attached to the front surface of the front side plate 1a of the frame 1, and a carriage drive motor 6 is attached to the front right end of the metal front wall plate 5. A ribbon feeding mechanism 7 consisting of a plurality of gears is arranged on the front surface of the left end.

Between the driving toothed pulley 8 supported at the rear of the carriage drive motor 6 and the driven toothed pulley 9 provided at the rear of the ribbon feeding mechanism 7, endless teeth are provided with toothed portions 10a formed on the inner surface. A belt 10 is stretched. The drive toothed pulley 8 is connected to the motor shaft of a carriage drive motor 6 via gears 12a and 12b, and as the motor 6 is driven, the toothed belt 10 is moved to the platen 2.
It is designed to run back and forth parallel to the printing line direction. Further, a ribbon feeding roller in a ribbon cassette 11 mounted on a cover (not shown) that covers the top surface of the printing device is attached to a drive shaft 7a provided in the ribbon feeding mechanism 7 and extending vertically.
As the driven toothed pulley 9 rotates, the ribbon R in the cassette 11 is moved along the front surface of the print line of the platen 2 via the ribbon feeding mechanism 7. It is becoming more and more common.

At a front position close to the platen 2, the frame 1 supports a guide shaft 13 that extends left and right in parallel with the platen 2, and a carriage 14 is inserted and supported on the guide shaft 13 through a cylindrical portion 14 at the lower front end. The platen 2 can reciprocate left and right along the printing line. As shown in FIGS. 2 and 3, this carriage 14 has a base portion 16 that traverses the running portion of the toothed belt 10 from below.
and a vertical portion 17 that rises from the front end of the base portion 16 at a nearly right angle.
The carriage 14 is engaged and placed on the bent portion 5a of the carriage 14.
A holding piece 18 for holding the holding piece 18 substantially horizontally, and a projecting piece 19 located below the bent portion 5a to prevent the holding piece 18 from floating upward are provided. Further, a paper guide portion 2 is provided at the upper end of the vertical portion 17 so as to cover the front surface of the platen 2.
0 is formed. In the description of the carriage 14 and the print head 39 to be described later, the platen 2 side will be referred to as the front side and the opposite side will be referred to as the rear side.

The upper surface of the base portion 16 of the carriage 14 is integrally formed with an engaging tooth portion 22 extending from above to the left and right, where the tooth portion 10a of the toothed belt 10 on the upper side faces from above, and a recess portion 22a is formed in the center of the engaging tooth portion 22. is formed. A pair of protrusions 23 are formed on the left and right side walls 16a and 16b of the base portion 16 above the left and right ends of the engagement tooth portion 22, respectively, and face each other at a predetermined interval. 10 can move in and out vertically between these protrusions 23. Further, at the rear end of the left side of the base part 16, there is a horizontal part 24a that is slightly higher than the upper surface of the engaging tooth part 22, and a vertical part 24b extending downward from the rear end of the horizontal part 24a. A cable guide plate 24 is formed. Furthermore, the left side wall 1 of the base portion 16 is located at a predetermined distance upwardly from the upper surface of the horizontal portion 24a of the cable guide plate 24.
A locking rod 25 is formed to protrude rearward from the rear end surface of 6a.

On the other hand, the upright portion 17 of the carriage 14 has a guide portion 2 for mounting a print head 39 to be described later.
7 are arranged. The guide portion 27 in this embodiment includes a fitting hole 28 formed downwardly in the center portion in the left-right direction of the vertical portion 17, and a fitting hole 28 formed in the vertical center portion in the left-right direction.
It is comprised of a pair of left and right protrusions 29 that are vertically provided on the upper surface of the vertical portion 17 so as to sandwich the upper surface frontage portion of the vertical portion 8 from the left and right sides. Both protrusions 29 position the printing head 39 in the left-right direction with respect to the carriage 14, and the side wall portion 3 has a front end slightly bent inward.
0 and a rear wall portion 31 that receives a reaction force during printing operation, and these wall portions 30 and 31 form a pair of left and right guide grooves 32 continuous with the insertion hole 28 inside both the protrusions 29. is formed. Also, guide section 2
7, a notch 3 is provided between the left and right rear wall portions 31.
3 is formed, and the lower surface of this notch 33 serves as a lower positioning portion 34 for positioning the printing head 39 in the downward direction. Furthermore, both rear wall portions 31
Locking protrusions 36 each having a diagonal recess 35 formed on the front side are provided on the upper surface.

The print head 39 in this embodiment, which is mounted on the guide 27 of the carriage 14, includes an electromagnetic device 40 for actuating a print wire (not shown);
A flat flexible cable 42 is fixed to the front surface of the electromagnetic device 40 for supplying printing signals to the electromagnetic device 40. A triangular index 43 is provided on the upper surface of the front end of the nose portion 41.
A pair of left and right guided plates 4 that are longer than the vertical length of the nose portion 41 are provided on both left and right sides.
4 is formed to protrude downward. When the print head 39 is attached to the carriage 14, both guided plates 44 are fitted into the guide groove 32 and the fitting hole 28 of the guide portion 27, and the side wall portion 30 allows the print head 39 to be attached to the carriage 14.
9 is positioned in the left-right direction, and the print head 39 is positioned downward by engagement between the lower surface of the nose portion 41 and the lower positioning portion 34.

Further, a leaf spring 45, which is an elastic member formed by bending a metal plate, is removably supported on both guided plates 44 of the printing head 39. This leaf spring 45 has a notch 46 into which the nose portion 41 fits from below, and a bent portion 47 that covers the front surfaces of both guided plates 44 and is bent rearward at the lower end.
The connecting piece 48 connects the upper ends of the hanging pieces 47 and engages with the indicator 43 of the nose part 41 to restrict forward movement. ing. Both hanging pieces 47
A locking step portion 49 is formed at the center of the inner edge of each of the springs to engage with the lower surface of the nose portion 41 to restrict upward movement of the leaf spring 45.

In this embodiment, the bending angle α of the bent portion 47a of the hanging piece 47 is set to about 170 degrees, and the bending angle β of the connecting piece 48 is set to about 170 degrees.
It is set at 93 degrees. Therefore, as shown in FIG. 3, when the print head 39 is attached to the carriage 14, the connecting piece 48 of the leaf spring 45 is attached to the guide portion 2.
7, both hanging pieces 47 are interposed between the front wall of the upright part 17 and the guided plate 44, so that the leaf spring 4
Based on the spring action of the whole 5, the guided plate 44 is urged downward and rearward, so that the rear side of the guide plate 44 is pressed against the front surface of the rear wall 31, and the lower side of the nose 41 is pressed against the front side of the rear wall 31. It is adapted to be pressed into contact with the lower positioning portion 34.

On the other hand, as shown in FIG. It is integrally formed of synthetic resin from a belt-shaped belt-holding plate 52 that is approximately the same size as the engaging tooth portion 22, and a cable-holding plate 53 that covers the cable guide plate 24 of the carriage 14 from above and from the front. . A regulating protrusion 56 that fits into a fitting recess 55 formed in the right side wall 16b of the base portion 16 is formed on the upper surface of the right end of the belt holding plate 52, and a regulating protrusion 56 is formed at a predetermined distance toward the center from the regulating protrusion 56. A pair of protrusions 2 on the right side of the base portion 16 are provided on both front and rear sides of the belt presser plate 52 at the separated position.
A pair of cutout recesses 54 are formed into which 3 can go in and out. Further, a pressing protrusion 57 is provided approximately at the center of the lower surface of the belt presser plate 52, and faces the recess 22a of the engagement tooth portion 22 from above. During assembly, the left side of the front regulating projection 56 of the belt holding plate 52 engages with the right side of the right projection 23 of the carriage 14 to position the holding plate 52 in the left direction. The engagement between the upper surface of the right end of the belt and the lower surface of the right protrusion 23 of the carriage 14 prevents the right side of the holding plate 52 from slipping upward, and the belt holding plate 52
The upper surface of the left end of the carriage 14 and the projection 23 on the left side of the carriage 14
By engaging with the lower surface of the presser plate 52, the left side of the presser plate 52 is prevented from coming off upward. Therefore, the third
As shown in the figure, in this state, the belt presser plate 52
The pressing protrusion 57 and the recess 22a of the engaging tooth portion 22
As a result of the fitting, the toothed belt 10 and the flexible cable 42 are held between the lower surface of the belt presser plate 52 and the engaging tooth portion 22.

The cable holding plate 53 of the holding member 51 has a horizontal holding part 53a corresponding to the horizontal part 24a of the cable guide plate 24 in the carriage 14, and a vertical holding part 5 corresponding to the hanging part 24b of the same guide plate 24.
3b. A tongue piece 58 is formed at the rear of the left edge of the horizontal holding part 53a and projects to the left through the lower side of the locking rod 25 of the carriage 14, and on the upper surface of the tip thereof, the tongue piece 58 is engaged with the locking rod 25. A locking protrusion 58 that prevents the holding member 51 from coming off in the right direction
A is provided. Furthermore, the cable holding plate 5
A slit 59 extending vertically is provided in the center of the vertical holding part 53b of No. 3, and a pressing piece 60 having a pressing protrusion 60a at the upper end of the front surface is inserted into the slit 59.
are integrally formed. And the carriage 14
When assembling the holding member 51 to the
The cable guiding plate 2 is held between the horizontal holding part 53a of the
It is adapted to be pressed against the front surface of the hanging portion 24b of No. 4.

With the configuration described above, the printing head 39 is attached to the carriage 14, and the toothed belt 10 and the flexible cable 42 are assembled and fixed, and as the carriage drive motor 6 is driven, the toothed belt While the carriage 14 is reciprocated along the print line direction of the platen 2 via the print head 39 based on the print signal supplied via the flexible cable 42
A printing operation can be performed on the upper printing paper P.

As shown in FIG. 1, the flexible cable 42 extending from the rear end of the carriage 14 is secured within the front end of the frame 1 by the front plate 1a of the frame 1 and the partition plate 61 erected behind it. Cable storage chamber 62 formed to extend left and right
The tip of the cable is led out to the outside of the frame 1 through an opening 63 provided in the center of the bottom wall of the cable accommodation chamber 62 . In the figure, reference numeral 64 denotes a holding plate erected at the left end of the rear edge of the opening 63 to hold the flexible cable 42 in an upright position.

Next, the attachment of the print head 39 to the carriage 14 and the assembly of the toothed belt 10 and the flexible cable 42 in the printing apparatus constructed as described above will be explained.

Now, as shown in Figure 2, the front end is the guide shaft 1.
When attaching the printing head 39 to the carriage 14, which is inserted through and supported by the printer head 3 and whose rear end is engaged and placed on the front wall plate 5, first attach both guided plates of the nose portion 41 of the head 39. 44 with leaf spring 4
5 is assembled from above, and then the leaf spring 45 and the guided plate 44 are fitted into the fitting hole 28 along the guide groove 32. Then, both guided plates 44 move to the guide portion 27.
The print head 39 is held between the side walls 30 of
At the same time, the lower surface of the nose portion 41 comes into contact with the upper surface of the lower positioning portion 34, and the print head 39 is positioned downward. Furthermore, in this state, as shown in FIG.
is urged downward to maintain the pressure contact state between the nose portion 41 and the lower positioning portion 34, and the guided plate 44 is urged rearward to be held in pressure contact with the front surface of the rear wall portion 31 of the guide portion 27. . That is, in the leaf spring 45 of this embodiment, the connecting piece 48 is bent at an obtuse angle close to a right angle, and a bent part 47a is provided at the lower end of the hanging piece 47, so that the connecting piece 48 is bent at an obtuse angle close to a right angle. When the leaf spring 45 is press-fitted into the fitting hole 28 in the natural state shown, the connecting piece 48, the hanging piece 47, and the bent part 47a of the leaf spring 45 are deformed and deformed, respectively, as shown by solid lines in the figure. The spring force A possessed by the entire leaf spring 45 is divided into a component force B acting downward and a component force C acting backward, and accordingly, the guided plate 44 moves downward and backward. Each is energized.

Therefore, by the above-described simple assembly, the printing head 39 can be simultaneously positioned in the left-right direction, downward direction, and rearward direction with respect to the carriage 14, and its mounting position can be maintained reliably. Therefore, there is no risk that the printing head 39 will wobble on the carriage 14, and in particular, the pressure contact between the guided plate 44 and the rear wall portion 31 is reliably maintained.
Thereafter, the wall portion 31 firmly receives the reaction force acting on the print head 39 due to the collision between the print wire and the platen 2 during the printing operation, and the printing paper P
It is possible to prevent characters printed thereon from becoming blurred or the like.

On the other hand, the toothed belt 10 is connected to the carriage 14.
and a flexible cable 4 extending from the print head 39.
When assembling toothed belt 1, first
With the upper side of the belt 10 held vertically, the carriage 14 is inserted between the protrusions 23 and the teeth 1 of the belt 10 are inserted.
0a is joined to the engagement tooth portion 22. Next, the flexible cable 42 extending from the print head 39 is positioned above the toothed belt 10, suspended downward along the cable guide plate 24, curved within the cable storage chamber 62, and has its tip opened. 6
3 to the outside of frame 1.

Next, the notch recess 54 of the holding member 51 and the right protrusion 23 of the carriage 14 are aligned to join the belt holding plate 52 to the upper side of the toothed belt 10 and the flexible cable 42, and in this state, the holding member 51 is
If you slide it slightly to the left, the belt presser plate 5
The regulating protrusion 56 of No. 2 is connected to the fitting recess 5 of the carriage 14.
5, and the holding member 51 is positioned to the left, and the locking protrusion 58a of the cable holding plate 53 engages with the locking rod 25 of the carriage 14, and the holding member 51 is positioned to the right. is prevented from falling off. At the same time, both left and right ends of the belt holding plate 52 are pressed from above by the respective protrusions 23, so that the lower surface and pressing protrusion 57 of the belt holding plate 52 and the engaging tooth portion 22 of the carriage 14 and its recess 22a are pressed down.
Between the toothed belt 10 and the flexible cable 42
are strongly clamped, thereby reliably preventing displacement of the toothed belt 10 in the left-right direction and movement of the flexible cable 42 in the front-back direction.

Furthermore, when the holding member 51 is assembled to the carriage 14, the cable holding plate 53 of the holding member 51
grips the flexible cable 42 and covers the cable guide plate 24 of the carriage 14 from above and from the front, and due to the elasticity of the pressing piece 60 of the cable holding plate 53, the flexible cable 42 is pushed to the hanging part 2 of the cable guide plate 24.
4b to prevent the flexible cable 42 from twisting due to the reciprocating movement of the carriage 14.

Therefore, according to such an assembly, the toothed belt 10 and the flexible cable 42 can be reliably assembled and fixed to the carriage 14 using one presser member 51, and the carriage 1
4, the holding member 51 can be attached by hand with one touch, which not only reduces the number of parts but also improves work efficiency compared to assembly work performed using conventional tools.

Effects As detailed above, according to this invention, when the presser member is attached to the carriage, the flexible cable is positioned between the toothed belt and the presser member, and the flexible cable and the toothed belt are By configuring it so that it is held between the holding member and the carriage, the toothed belt and the flexible cable can be reliably assembled and fixed to the carriage with one holding member, and the holding member This provides an excellent effect in that the member can be easily attached to the carriage.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a printing device showing an embodiment embodying this invention, Fig. 2 is an exploded perspective view of the main parts, and Fig. 3 shows the printing head, toothed belt, and flexible an enlarged sectional view taken along line A-A in FIG. 1 showing the assembled state of the cable;
FIG. 4 is an enlarged longitudinal cross-sectional view of a main part showing the action of the elastic member. In the figure, 2 is a platen, 10 is a toothed belt, 10a is a toothed portion thereof, 14 is a carriage, 22
27 is an engaging tooth portion, 27 is a guide portion, 30 is a side wall portion as a positioning portion in the left and right direction, 31 is a rear wall portion, 34 is a downward positioning portion, 39 is a print head, 42 is a flexible cable, and 44 is a cover. The guide plate 45 is a leaf spring as an elastic member, 51 is a pressing member, and P is a printing paper.

Claims (1)

[Claims for Utility Model Registration] Printing head 39 supported on carriage 14
A printing operation is performed on the printing paper P on the platen 2 by the printing head 39 while supplying a printing signal to the printer via the flexible cable 42 and reciprocating the carriage 14 along the printing line direction of the platen 2. In the printing device, the toothed belt 10 is stretched so as to have a running portion that reciprocates in parallel with the printing line direction, and the carriage 14 is formed on the carriage 14 that crosses the running portion of the toothed belt 10 from below. an engaging tooth portion 22 with which the tooth portion 10a of the toothed belt 10 faces from above; a presser member 51 supported by the carriage 14 so that the toothed belt 10 engages with the engaging tooth portion 22; When the presser member 51 is attached to the carriage 14, the flexible cable 42 is positioned between the toothed belt 10 and the presser member 51, and the flexible cable 42 and the toothed belt 10 are A printing device characterized in that it is configured to be held between a presser member 51 and a carriage 14.