JPH04216066A - Printing head - Google Patents

Abstract

PURPOSE:To obtain a printing head for printer in which reliability is improved by preventing the removal of a printing wire from a wire guide caused by a vibration during printing. CONSTITUTION:In a printing head in which a printing element 3 containing a drive element 8 and an armature 9 is clamped between a nose 1 serving as one clamping member provided with a wire guide 5 and a planar member 2 serving as the other clamping member by a leaf spring 4 so as to be engaged with at least one of the clamping members, a gap between said clamping member of an engaging side and said leaf spring 4 is filled with a filler 21.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head for a printer.

0002

2. Description of the Related Art FIG. 2 is a side view showing the structure of a conventional suction type print head. In the figure, 1 is a nose which is one of the clamping members, 2 is a plate-like member which is the other clamping member, and 3 is a printing head. element,
4 is a leaf spring.

The nose 1 includes a wire guide 5 and an engaging portion 6 for coupling, and the plate member 2 includes a plurality of locking portions 7 for coupling at equal intervals in the circumferential direction. . Print element 3
includes a plurality of driving elements 8 arranged at a predetermined pitch in the circumferential direction, and a plurality of armatures 9 facing each of the driving elements 8. The drive element 8 includes a core 10 and a coil 11 wound around the core 10, and the armature 9 has a printing wire 1 guided by the wire guide 5.
2. 13 is a spring for restoring the printing wire 12.

The leaf spring 4 is shown in FIG. 3 (FIG. 3(A) is a front view;
As shown in detail in FIG. 3(B) (side view), a plurality of arms 15 are provided protruding from a substantially ring-shaped engaging portion 14, and each arm 15 has a corresponding locking portion 7. A locking hole 16 is formed.

The print head is constructed by sandwiching and coupling a printing element 3 between a nose 1 and a plate-shaped member 2 by a leaf spring 4. At the time of this coupling, the engaging portion 14 of the leaf spring 4 is connected to the nose 1.
The locking hole 16 of each arm 15 of the leaf spring 4 locks with each locking portion 7 of the plate member 2. For this locking, press and bend each arm 15 with your fingers to lock the locking hole 16.
is locked in the locking part 7. The reason why the above connection structure is adopted without screwing the nose to the head body is to make the head smaller and lower in cost.

[0006] When printing, the coil 11 of a predetermined drive element 8 is energized for a predetermined period of time. As a result, the driving element 8
The armature 9 facing the core 10 is attracted to the core 10, and the printing wire 12 whose base portion engages with the armature 9 moves forward against the biasing force of the spring 13 to perform a printing operation.

[0007] When printing is completed, the current to the coil 11 is stopped, and the printing wire 12 which has completed the printing operation
The armature 9 is returned to its original position by the urging force of the spring 13.

[0008]

[Problems to be Solved by the Invention] In the case of the above-mentioned coupling structure, the leaf spring needs a spring force and a bending amount that can be easily pressed with a finger, but on the other hand, it does not cause the printer to vibrate or fall. In such cases, the weight of the head body generates a force that bends the leaf spring, and the printing wire may come off from the wire guide. SUMMARY OF THE INVENTION An object of the present invention is to provide a print head that can improve reliability by preventing a printing wire from coming off a wire guide due to vibration during printing.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a driving element between a nose, which is one of the clamping members provided with the wire guide, and a plate-like member, which is the other clamping member. , a print head in which a printing element including an armature is held between leaf springs with at least one side on the engagement side, and a gap between the holding member on the engagement side and the leaf spring is filled with a filler material.

0010

[Operation] By filling the gap with the filler material as described above, the amount of deflection of the leaf spring can be reduced and the load that deflects the spring can be increased. In addition, the work of filling the filling material is
Perform after assembling the print head.

[0011] Therefore, when assembling the head, it is possible to easily connect and assemble the head using finger force, and furthermore, after assembly, the deflection of the leaf spring can be made very small under normal vibrations.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a side view showing the structure of the print head of this example.
In the figure, 21 is an adhesive (filler). Note that the same reference numerals are used for members similar to those in the past.

The adhesive 21 is filled in the gap between the engaging portion 6 and the engaging portion 14. As a result, the amount of deflection of the leaf spring 4 is reduced, and the load for bending the leaf spring 4 can be increased.

[0014] Therefore, during assembly, it can be easily assembled using the force of fingers, and after assembly, the deflection of the leaf spring can be made very small under normal vibrations, which prevents the wire from coming off from the wire guide. can do.

[0015] In the above explanation, an example in which the locking portion is provided on the plate-like member side has been described, but the same applies even if the locking portion is provided on the nose side. Further, as the filler, a special member other than the adhesive of this example may be used and inserted into the gap. In addition, in the above explanation, the printing element 3 is a suction type print head, but the printing element 3 is a release type,
The effects of the present invention can be achieved no matter what type of method is used, such as a piezoelectric method.

[0016]

As described above, according to the present invention, the gap between the engagement portion between the leaf spring and the nose or the plate member is filled with a filler material, thereby preventing the plate from vibrating when the printer vibrates. The deflection of the spring can be made very small. Therefore, it is possible to prevent the wire from coming off the wire guide due to vibrations, thereby improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of a print head according to an embodiment of the present invention.

FIG. 2 is a side view showing the structure of a conventional print head.

3 is a detailed view of the leaf spring of FIG. 2, with FIG. 3(A) being a front view and FIG. 3(B) being a side view.

[Explanation of symbols]

1 Nose (one clamping member) 2 Plate member (other clamping member) 3 Printing element 4 Leaf spring 5 Wire guide 8 Drive element 9 Armature 21 Adhesive (filler)

Claims (1)

[Claims] 1. A drive element (8), an armature (
In a print head in which a printing element (3) containing a printing element (3) is held between leaf springs (4) with at least one side on the engagement side, the gap between the holding member on the engagement side and the leaf spring (4) is filled. A print head characterized in that it is filled with a material (21).