JPS59222375A - Printing head supporting device for printer - Google Patents

Abstract

PURPOSE:To enable to fit and detach a printing head in a single stroke, by a method wherein when a positioning hole and a positioning pin provided at faced surfaces of a printing head and a carrier are engaged to each other, a tension spring provided on the positioning hole side is engaged to the positioning pin. CONSTITUTION:The positioning holes 11 of the printing head 4 are engaged to the positioning pins 3 of the carrier 1. The tension spring 13 contracts in diameter due to its own elasticity, and is engaged deviatedly to an upper part of a groove 6 of the pin 3, whereby a component of force for pulling the pin 3 upward is generated from the force exerted on the pin in a radial direction by the spring 13. Therefore, the head 4 is securely fixed both in horizontal directions and in vertical directions. When the head 4 is pulled upward with a large force, the spings 13 are expanded, and the head 4 can be detached from the carrier 1.

Description

TECHNICAL FIELD OF THE INVENTION This invention relates to a print head holding device for a printer.

Technical background of the invention and its problems In a printer with a print head mounted on a carrier,
The condition of securely fixing the print head is prioritized, and there is a disadvantage that it cannot be installed with one touch of the print head.Purpose of the Invention This invention was made in view of the above points, and it is easy to attach and detach the print head. The entire purpose of this printer is to provide a printer's print head holding device that can be operated with one touch.

Summary of the Invention This invention provides a positioning pin and a positioning hole provided on opposing surfaces of a print head and a carrier. When they are engaged with each other and fully positioned, and the positioning pin is fitted into the positioning hole, the tension spring provided around the positioning hole is engaged with the tip of the positioning pin, and the positioning pin is closed. Embodiment of the Invention A first embodiment of the invention will be described with reference to FIGS. 1 to 5. do. (IJ is a carrier. This carrier (1
) is provided with a bushing (2) that is slidably fitted onto the carrier shaft (one), and a pair of left and right positioning pins (3) are erected on the top surface, as well as a print head (4). An opening (5) is formed through which a portion of the positioning pin (3) escapes.A ring-shaped groove (6) constricted into a U-shape with a shallow cross section is formed on the outer periphery of the tip of the positioning pin (3).

The frame (7) of the print head (4) Ic is the mounting piece (8
) is formed in one piece, and this mounting piece (8)
A guide α0) for holding a plurality of needles (9) in a slidable manner is attached at a predetermined interval between the needles (9) and the needles (9). The mounting piece (8) has two positioning holes (1υ) with the same diameter as the positioning pin (3) and a plurality of hooks u3 that are holding parts.
is formed.

Two tension springs A stage are provided.

These are made by bending a single steel wire to form a locking part α and two legs α9 and T, and the base and legs a9 are held by the hook (I). As shown in FIG. 5(a), the positioning pin (3) is approximately circular in shape and has a shorter diameter smaller than the diameter of the positioning hole Qυ.
i- positioning hole aI), the groove (G
) so that a part of the groove (6) is hidden in the positioning hole (11).
The location is determined. Furthermore, the diameter of the tension wire 219770th floor is set to be considerably thinner than the width of the groove (6).

In such a configuration, the print head (4)? Hold it and fit it into the positioning hole αυ all positioning pins (3).

At this time, the positioning pin (3) expands and protrudes from the positioning hole 0υ as shown in FIG. 5(6): the locking portion (14)'fr of the tension spring aJ. The tension spring α (to) contracts in diameter due to its own elasticity and elastically fits into the groove (6). In this state, the tension spring a is connected to the minimum diameter part of the to (6). As shown in Fig. 4, the fitting is biased towards the upper part of the locating pin (3), rather than the center part, as shown in Figure 4. A tensile force is generated. therefore,
The print head' (, 1) is securely fixed both in the horizontal direction tC and in the vertical direction V. By pulling the print head (4) upwards with a large force, the tension ring spreads and the print head (4) can be removed from the carrier (1). Therefore, the print head (4) can be attached and detached with one touch.

In addition, as shown in FIG. 6, a 7-shaped wa7) may be formed on the positioning pin (3). Even in this case, the positioning pin (3) can be maintained in an upwardly pulled state by fitting the tension spring (13) 'e to the upper part of the groove aη exposed from the positioning hole circle. Also, positioning holes in carrier (1) (tilj←υ and 7
The print head (4) may be provided with positioning pins (3) on the print head (4) and 8tu.

Next, a second embodiment of the present invention will be explained based on FIG. Are the same parts as in the previous example given the same symbols? Explanation of usage is also omitted (the same applies hereafter). This embodiment includes one tension spring (made of 18-karat gold) having two locking R (tl-) fitted into the grooves (6) or (17) of the two positioning pins (3). A hook a2 is formed on the mounting piece (8) in accordance with the shape and size of the constant thread 5 ring (ll).The function is the same as in the previous embodiment.

Next, FIG. 8 shows a third embodiment of the present invention. In this embodiment, the frame (7) of the print head (4) has a mounting piece (8) formed in one piece with a clearance hole (19cL) corresponding to the positioning pin (3) and a mounting hole (1 hole) on the left and right sides. 1 are formed, and these mounting holes (1) are attached with screws (2 (I), positioning holes aυ and hooks (1
The mounting plate (2alt) that meets the mounting plate (2alt) is provided separately. Therefore, the positioning pin (3) is set to a length that passes through the relief hole (19) and fits into the positioning hole aυ of the mounting plate (221). In this way, the positioning hole (11
By forming the mounting plate ρ'4 having the die-casting frame (7) and the hook (1) separately from the die-casting frame (7), each of the mounting plates can be easily formed using a metal plate. The hook is also formed by cutting and raising it from purple wood to increase its strength.

Effects of the Invention Since the present invention is configured as described above, the positioning holes and positioning pins provided on the facing surfaces of the print head and the carrier. When fitted, the tension spring can be engaged with all the positioning pins provided on the positioning hole side and can be prevented from coming out. Therefore, it has the effect of allowing the print head to be attached and detached with just one touch. be.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the first embodiment of the present invention, Figure 2 is its front view, Figure 3 is an exploded perspective view of its main parts fully enlarged, and Figure 4 is its main parts fully enlarged. 5 is an enlarged plan view showing the diameter reduction operation of the tension spring, FIG. 6 is a fully enlarged sectional view of the main part of a modification thereof, and FIG. 7 is a second embodiment of the present invention. Example? Part to show? The enlarged perspective view, FIG. 8, is an exploded perspective view of a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Carrier, 3... Positioning pin, 4... Print head, 6... Groove, 8... Mounting piece, 11... Positioning hole, 12... Hook (holding part), 13...Tensioning spring, 17...Groove, 18...Tensioning spring Applicant: Tokyo Electric Co., Ltd.

Claims (1)

[Claims] 1. Positioning holes and positioning pins that fit into each other at positions t on the left and right sides are provided on the facing surfaces of the carrier and the print head that reciprocate along the platen, and the tips of these positioning pins are provided. A printer characterized in that a constricted groove having a V- or U-shaped cross section is formed on the outer periphery, and a tension spring whose diameter can be freely contracted and which elastically engages with the groove is provided around the positioning hole. print head holding device. 2. The groove is positioned at Nanao to prevent a part of the groove from being hidden in the positioning hole, and the wire diameter of the tensioning spring is set to a thickness that fits into the groove in the portion exposed from the positioning hole. A print head holding device for a printer according to claim 1. 3. The print head holding device for a printer as set forth in claim 1, further comprising a tension spring upper membrane that is fitted into the grooves of the plurality of positioning bins. 4. The scope of claim 1, which is characterized in that the carrier has a positioning bin, a positioning hole, a holding part for holding all the tension springs, and a mounting piece for covering are integrally provided on the print head. A printer's print head holding device.