JPS622135Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a print head fixing device for fixing a print head having a substantially cylindrical outer shape to a carriage.

Purpose The purpose of this invention is to provide a print head fixing device which can easily and reliably position and fix the print head at a predetermined position on a carriage, and which has a simple structure and low manufacturing cost.

Embodiment An embodiment embodying this invention will be described below with reference to the drawings.A platen 1 is disposed in a printer frame (not shown).
A pair of guide rods 2 are installed on the machine frame at a predetermined interval so as to extend parallel to the printing surface. As shown in FIG. 2, the carriage 3, which is bent and formed from a plate material, is movably pushed into the guide rod 2 by bearing metals 4 and bearing members 5 provided at both front and rear ends of the carriage 3, and is supported by the platen 1. It is designed to be moved laterally along the printed surface of the page. As shown in FIG. 3, a substantially square hole 6 is formed in the center of the upper surface of the carriage 3, a rectangular fitting hole 7 is formed near one side of the hole 6, and a rectangular fitting hole 7 is formed near the other side of the hole 6. Fitting hole 7
Fitting holes 8 are formed at positions facing each other.

Meanwhile, the platen 1 is placed on the carriage 3 and moved together with the carriage 3.
The printing head 9 performs printing operation on the printing surface of
As shown in FIGS. 4 and 5, it is formed into a substantially cylindrical shape with a diameter larger than the width of the opening 6, and has a small columnar nose portion protruding toward the platen 1 on one side thereof. . Further, a pair of notches 10 are provided on both sides of the lower end of the peripheral edge of the columnar portion 9a with an interval slightly smaller than the width of the opening 6. This cutout portion 10 includes vertical wall surfaces 10a that abut and engage with the inner edges on both sides of the opening 6, and a horizontal surface 10b that is placed on the upper surface of the carriage 3.
Then, the vertical wall surface 10a of this notch 10 engages with both side edges of the opening 6, and
The print head 9 is placed on the carriage 3 with its lower portion recessed into the opening 6 so that the horizontal surface 10b of the notch 10 engages with the upper surface of the carriage 3.

Next, a description will be given of the fixing member 11 which is wound around the cylindrical peripheral edge of the print head 9 placed on the carriage 3 as described above and is used to securely fasten the print head 9 to the front surface of the carriage 3. .

Now, this fixing member 11 includes a locking plate 12 as a first member that can be deformed between the chain line position and the solid line position in FIG. 5, and the chain line in FIG. It is composed of a fixing belt 13 as a second member that can be deformed between the position shown in the solid line and the solid line position. As shown in FIGS. 4 and 5, the hanging plate 12 has a fixed portion 12a on one end side and
and an upright portion 12b at the other end extending perpendicularly from the end to the other end, forming a substantially L-shaped cross section, and a locking hole 14 slightly wider than the width of the fixing belt 13 is formed at the tip of the upright portion 12b. . In a state where the fixed portion 12a is fitted and fixed into one of the fitting holes 7 on the carriage 3, the upright portion 12b extends substantially perpendicularly from the surface of the carriage 3.

On the other hand, the fixed belt 13 has a fixed part 13 at one end.
The engaging part 1 is composed of a winding part 13b extending perpendicularly from the fixed part 13a, and has a substantially mountain-shaped cam part 15a at the tip of the winding part 13b.
5 is formed. And the fixed part 13a
is fitted and fixed into the other fitting hole 8 on the carriage 3, the winding portion 13b extends upward from the surface of the carriage 3, and the winding portion 13b is wound around the cylindrical peripheral edge of the printing head 9. As it is rotated, the engaging portion 15 can be engaged with the retaining hole 14 of the retaining plate 12.

The operation of the print head fixing device constructed as described above will now be described.

Now, when the print head 9 is fixed on the carriage 3, the print head 9 is placed on the aperture 6, and the notches 10 are engaged with both side edges of the aperture 6. When the printing head 9 is moved rearward in this state, its rear end surface comes into contact with the rear end of the opening 6,
In this state, the rearward position of the print head 9 is regulated and positioned.

In this state, the winding part 13b of the fixing belt 13 is wound around the cylindrical peripheral part of the printing head 9, and the engaging part 15 at the tip thereof is inserted into the latching hole 14 of the latching plate 12.
Then, when the upright portion 12b of the locking plate 12 is pressed toward the printing head 9 from the position indicated by the chain line in FIG. It moves to the proximal end side of the portion 15 and is latched. In this state, the fixing belt 13
The restoring force toward the chain line position in Fig. 4 and the latching plate 12
Due to the restoring force toward the chain line position in Figure 5, both of them are 1
3 and 12 are tensioned, and the print head 9 is pressed against the surface of the carriage 3 and fixed in place on the carriage 3. Therefore, in this print head fixing device, the print head 9 can be easily and reliably fixed in a predetermined position of the carriage 3.

Note that this invention is not limited to the above-mentioned embodiments, and the shape, structure, etc. of each part can be arbitrarily changed without departing from the spirit of this invention.

Effects As described in detail above, this invention allows a carriage on which a print head is placed, which has a roughly cylindrical outer shape in part and a small columnar nose portion protruding toward the platen, to move in the printing direction of the platen. In a printer that performs a printing operation while moving the printer, the carriage is provided with an aperture having a width smaller than the diameter of the cylindrical portion of the print head, and a lower portion of the cylindrical portion of the print head is provided with an aperture of a width smaller than the diameter of the cylindrical portion of the print head. Wall surfaces abutting and engaging on both sides and a horizontal surface placed on the upper surface of the carriage are provided, and a deformable latching plate extending upward from the upper surface is fixed to the carriage near one side of the opening. At the same time, a deformable fixing band is fixed to the carriage in the vicinity of the other side of the opening, and extends upward from the top surface of the carriage and has a length enough to wrap approximately half the circumference of the cylindrical portion of the printing head, and An engaging portion having a cam portion bent into a mountain shape is formed on one of the tip of the stop plate and the tip of the fixing band, and a latching plate that goes over the cam portion and latches is formed on the other side. As a result, the print head can be easily and reliably positioned and fixed at a predetermined position on the carriage, and the print head will not wobble when the direction of carriage movement is changed. Furthermore, the structure is simple and the manufacturing cost is low, which is an excellent effect.

[Brief explanation of the drawing]

Figure 1 is a side view of a cartridge that embodies this idea, Figure 2 is a partially cutaway front view of the cartridge, Figure 3 is a plan view of the cartridge, and Figure 4 is a portion of the cartridge to which the print head is fixed. Broken front view, No. 5
The figure is an enlarged sectional view of a main part showing the engagement state between the fixing belt and the hook plate. 3... Carriage, 6... Opening hole, 7, 8... Fitting hole, 9... Printing head, 9a... Cylindrical part, 1
0a...wall surface, 10b...horizontal surface, 11...fixing member, 12...hanging plate as first member, 13
. . . Fixed belt as a second member, 14 . . . A latching hole as a latching portion, 15 .
...cam club.

Claims (1)

[Claims for Utility Model Registration] Moving a carriage 3 on which a print head 9 is mounted, which has a substantially cylindrical outer shape in part and a small columnar nose projecting toward the platen, in the printing direction of the platen. In a printer that performs a printing operation while moving, the carriage 3 is provided with an opening 6 having a width smaller than the diameter of the cylindrical portion 9a of the print head 9, and a hole 6 is provided in the lower part of the cylindrical portion 9a of the print head 9. is provided with a wall surface 10a that abuts and engages on both sides of the aperture 6, and a horizontal surface 10b that is placed on the upper surface of the carriage 3, and near one side of the aperture 6, the carriage 3 is A deformable catch plate 12 extending upward is fixed to the carriage 3 near the other side of the opening 6, and extends upward from the upper surface of the carriage 3, and can be wound around approximately half the circumference of the cylindrical portion of the print head 3. A deformable fixing band 13 having a length is fixed, and a cam portion 15 is bent into a mountain shape at either the tip of the hanging plate 12 or the tip of the fixing band 13.
A fixing device for a printing head, characterized in that an engaging part 15 having a cam part 15a is formed, and a latching part 14 that goes over the cam part 15a and engages the cam part 15a is formed on the other side.