JPH0627157U - Printer with print head cover - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly safe printer with a print head cover that does not easily come off after the print head with the print head cover is mounted on the carriage frame. [Structure] Side walls 29 and 30 are erected on a print head mounting portion 28 of a carriage frame 12 on which a print head having a print head cover 11 is mounted, and projections 27 close to the side walls 29 and 30. ，
28 is provided on the print head cover 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printer with a print head cover in which a print head such as a wire dot print head is equipped with a danger prevention cover.

[0002]

[Prior art]

 Conventionally, there is a printer with a print head cover in which a print head equipped with a danger prevention cover is mounted on a carriage frame. FIG. 5 is a schematic external perspective view showing a conventional example including a broken portion, and FIG. 6 is an external perspective view of a conventional print head with a head cover. A wire dot printing head 2 (hereinafter referred to as the print head 2) equipped with a print head cover 1 (hereinafter referred to as the cover 1) is mounted on a carriage frame 3 to perform a spacing operation along an axis 4 in the direction of arrow AB. Then, printing is performed on a printing paper (not shown) with the platen 5 behind. During the printing operation, the surface temperature of the print head 2 may rise up to about 80 ° C. due to heat generation. When the printer is operating, the upper cover 6 is closed, and the operator does not touch the print head 2. However, immediately after printing, the upper cover 6 may be opened for replenishment of paper, etc., and the operator may touch the print head 2 directly. If the print head 2 is hot, there is a risk of burns. Therefore, a rubber or plastic cover 1 having a low thermal conductivity is attached to the print head 2 for personal protection.

Fixing of the cover is secured by screws as shown in FIG. 6 (A), but it is not preferable in terms of assembly because it takes time and effort to tighten the screws. Further, the screw 7 itself becomes hot, so it is necessary to prevent the screw 7 from touching. For fixing other covers, as shown in FIG. 6B, a hook portion 8 is provided on the cover 1 and the hook portion 8 is hooked on the print head 2. In this case, the cover 1 can be easily removed without using a tool or the like, so a display that requires the operator's attention is required. In the print head 2 with the cover 1 attached, the connector 2a is inserted into the carriage frame 3 side and mounted on the print head mounting surface 3a.

[0004]

[Problems to be solved by the device]

 In conventional printers with a print head cover, when the cover is attached to the print head, (1) the screws are securely fixed, but the screws are hidden in order to prevent them from touching the screws. is necessary. (2) The cover provided with a hook facilitates the mounting, but it has a problem that the safety is not perfect because it can be easily removed. It is an object of the present invention to provide a printer with a print head cover that makes it easy to attach the cover to the print head and does not easily remove the cover after mounting it on the carriage frame.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the printer with a print head cover of the present invention, a side wall is erected on the print head mounting surface with the print head sandwiched, and a protrusion portion is provided on the hook portion of the print head cover in the vicinity of the side wall. It is a thing.

[0006]

[Action]

 According to the printer with a print head cover configured as described above, when the print head cover is mounted on the print head, the hook portion bends by receiving a reaction force from the outer wall of the print head, and the print head cover is bent. It slides in the insertion direction and is attached to the print head. After mounting this print head on the carriage frame, even if you try to remove the print head cover, the protrusions on the hooks come into contact with the side walls of the carriage frame, so the hooks cannot bend outwards, and the print head cover It does not come off the print head. Therefore, according to the present invention, the print head cover can be easily attached to the print head, and the print head cover cannot be easily removed after the print head is mounted on the carriage frame.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. The elements common to the drawings are given the same reference numerals. FIG. 2 is a schematic external perspective view showing an embodiment including a broken portion. A wire dot print head 2 (hereinafter referred to as print head 2) equipped with a print head cover 11 (hereinafter referred to as head cover 11) is mounted on a carriage frame 12 to perform a spacing operation along an axis 4 in the direction of arrow AB. Then, printing is performed on a printing paper (not shown) with the platen 5 behind.

FIG. 3 is a sectional view showing the structure of the wire dot print head. An armature 14 having a wire 13 fixed to one end is supported by a spring 15 and placed in a magnetic path formed by an armature yoke 16, a permanent magnet 17 and a core yoke 18. The armature 14 is attracted to the attraction surface 18 a of the core yoke 18 by bending the spring 15 by the magnetic force of the permanent magnet 17. A coil 19 is wound around the core yoke 18, and terminals of the coil 19 are soldered to a connection board 21 via an insulating pad 20. Here, when the coil 19 is energized, the magnetic force of the permanent magnet 17 cancels out the magnetic force generated by the coil, the armature 14 is released from the attraction force of the core yoke 18, and the force accumulated in the spring 15 quickly and quickly. , Jump out in the direction of arrow D. Then, the tip of the wire 13 collides with the printing paper via the ink ribbon to print the dot. During the printing operation, the surface temperature of the print head 2 rises up to about 80 ° C. due to heat generation, so the head cover 11 is attached so that the operator does not touch it by mistake.

FIG. 4 is an external perspective view showing a state in which the head cover of the present invention is attached to the print head. The head cover 11 is attached to the print head 2 by claws 25 and 26 provided so as to face the flexible hook portions 23 and 24. Further, the hook portions 23 and 24 are provided with protrusions 27 and 28 outwardly. To attach the head cover 11 to the print head 2, the hook portions 23 and 24 are pushed along the side wall of the print head 2. The tips of the claws 25 and 26 receive an outward reaction force from the side wall of the print head 2, and move along the side wall while the hook portions 23 and 24 are bent. When reaching the end of the side wall, the claws 25 and 26 return due to the restoring force of the hook portions 23 and 24, and catch on the corner of the side wall.

FIG. 1 is an enlarged view seen from the direction C in FIG. The print head 2 with the head cover 11 is mounted on the print head mounting surface 28 of the carriage frame 12. At this time, the connection substrate 21 on the print head 2 side is inserted into a connector (not shown) of the carriage frame 12, and a screw (not shown) is attached to the attachment hole 22a of the head frame 22 shown in FIG. To do. Side walls 29 and 30 are erected on the carriage frame 12 so as to sandwich the print head 2 mounted on the print head mounting surface 28. At this time, the side walls 29, 30 and the protrusions 27, 28 of the head cover 11 are close to each other. Therefore, even after the print head 2 having the head cover 11 mounted thereon is mounted on the carriage frame 12, the protrusions 27 and 28 come into contact with the side walls 29 and 30 so that the head cover 11 cannot be removed.

[0011]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the following effects are achieved. After mounting the print head with the print head cover mounted on the carriage frame, the operator made a mistake because the protrusion provided on the print head abuts against the side wall of the carriage frame to prevent the print head cover from coming off when the print head cover is removed. The risk of getting burned by touching the hot print head is completely gone.

[Brief description of drawings]

FIG. 1 is an enlarged view seen from a direction C in FIG.

FIG. 2 is a schematic external perspective view showing an embodiment including a broken portion.

FIG. 3 is a cross-sectional view of a wire dot print head.

FIG. 4 is a perspective view of a print head with a head cover.

FIG. 5 is a schematic external perspective view showing a conventional example including a fractured portion.

FIG. 6 is a perspective view of a conventional print head with a head cover.

[Explanation of symbols]

 1, 11 Print head cover 23, 24 Hook part 25, 26 Claw 27, 28 Protrusion 29, 30 Side wall

Claims (2)

[Scope of utility model registration request] 1. A printer with a print head cover mounted on a print head mounting portion of a carriage frame after a print head cover is fixed to the print head with a flexible hook portion, wherein the print head mounting portion is sandwiched between the print head mounting portions. A printer with a print head cover, characterized in that a sidewall is provided upright on the hook and a protrusion adjacent to the sidewall is provided on the hook portion. 2. The printer with a print head cover according to claim 1, wherein the print head cover is integrally formed of a resin material.