JPH0541892Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a printing head holding device used in a printing machine.

BACKGROUND ART Conventionally, as shown in FIG.
flanged pins 52 are set upright at intervals of
There are print head holding devices rotatably mounted on both sides of the carrier 50.

Further, as shown in FIG. 6, fixing surfaces 58 and 59 for supporting the needle guide 57 of the printing head 56 are provided on the carrier 55 so as to be perpendicular to each other, and a claw formed at the lower end of a locking piece 60 formed of an elastic member is provided. 61
into the hole 62 of the carrier 55 and
There is a print head holding device which resiliently engages a portion 63 of the needle guide 57 and a claw 64 formed at the other end of the locking piece 60 resiliently engages with the needle guide 57.

Problems that the invention attempts to solve
It was devised to replace 6. On the other hand, the print heads 51 and 56 are connected to the carrier 50 or 5.
5. It is necessary to securely fix it without loosening it. For this purpose, the printer shown in FIG. 5 requires a clamp 53 to press the print head 51 against the carrier 50 with a strong force. For this reason, the clamp 53
It requires a large force to rotate, making it difficult to operate.
The disadvantage is that the number of parts increases. Furthermore, in the case of the printer shown in FIG. 6, the print head 56 will move unless the engagement force between the claw 64 and the needle guide 57 is increased, so a large amount of force is required to attach and detach the print head 56. Bad sex.

Means for Solving the Problem A carrier is provided which has a receiving surface for supporting the printing head and a positioning part that engages with the printing head and moves along the platen, and a fulcrum shaft and a locking part are attached to this carrier. a pressing part that is fixedly provided at a distance and presses the print head against the receiving surface; a shaft hole that is located on one side of the pressing part and is rotatably fitted to the fulcrum shaft; a locking pawl that faces the opening surface of the hole and resiliently engages with the end surface of the fulcrum shaft; and a hook that is located on the other side of the pressing portion and resiliently engages with the locking portion. A clamp is provided which is integrally formed of an elastic synthetic resin and has a knob of a predetermined length that is connected to the hook at one end and extends in a direction substantially perpendicular to the extending direction of the hook.

Function: Therefore, the printing head is supported by the receiving surface and its relative position to the carrier is determined by the positioning part, and when the shaft hole of the clamp is fitted from one end of the fulcrum shaft, a locking claw is attached to the other end surface of the fulcrum shaft. The clamp is elastically engaged to prevent the clamp from falling off the fulcrum shaft, and the clamp is rotated around the fulcrum shaft to elastically engage the hook with the carrier's locking part to print using the pressing part. Press the head against the receiving surface. Also,
Since the knob and the hook extend in directions substantially perpendicular to each other, it is easy to maintain the pinching state with two fingers such as the thumb and index finger, and in this state, by applying external force from the fingertips to the tip of the knob, a small While deforming the hook by external force and removing it from the locking part, the clamp is pinched and rotated with two fingers, and the pressing part can be detached from the print head, thereby facilitating the work of attaching and detaching the print head. Furthermore, the structure is simplified by eliminating the need for clamp attachment parts.

Embodiment An embodiment of this invention will be described based on FIGS. 1 to 4. 1 is a platen, and a carrier 4 is slidably fitted into carrier shafts 2 and 3 installed parallel to the platen 1. 5 is a printing head 5 for a dot printer, and grooves 7 are formed on both sides of a needle guide 6 of this printing head 5. The carrier 4 also includes a receiving surface 8 that supports the needle guide 6, and pillars 9 and 10 that are positioning parts that engage with the grooves 7 of the needle guide 6.
and fixing surfaces 12, which are positioning portions that clamp both sides of the expanded portion 11 of the needle guide 6, are formed. 13 is a clamp made of elastic synthetic resin, and this clamp 13 includes a pressing part 14 that presses the needle guide 6 against the receiving surface 8, and this pressing part 14.
A shaft hole 15 formed at one end, a locking pawl 16 facing the opening surface of the shaft hole 15, and a hook 17 located at the other end of the pressing part 14 and elastically bent. It has a knob 18 connected to this hook 17. The hook 17 and the knob 18 extend in different directions at slightly acute angles, and are shaped so that they can be easily grasped with the thumb and forefinger. The carrier 4 is formed with a boss 19 which is a fulcrum shaft located on the outside of the support column 9, and the support column 10 on the opposite side is formed with a protrusion 20 which is a locking part.

Further, a substrate 21 connected to a plurality of electromagnets for driving the needles is provided on the back side of the dot printer head 5, and a connector 22 connected to this substrate 21 is held by the carrier 4.

Furthermore, ink ribbons 2 are attached to both sides of the carrier 4.
A ribbon guide 24 is formed which defines the path of the ribbon. These ribbon guides 24 hold a paper guide 25 formed of a thin metal plate, and this paper guide 25 includes a print head 5.
A window hole 26 is formed for protruding the needle.

In such a configuration, first, the print head 5
The needle guide 6 is brought into contact with the receiving surface 8, the support columns 9 and 10 are fitted into the groove 7, and the enlarged portion 11 of the needle guide 7 is fitted between the fixed surfaces 12, thereby attaching the printing head 5 to the carrier 4. determine the relative position of Next, when the shaft hole 15 of the clamp 13 is fitted into the boss 19, the locking pawl 16 elastically engages with one end surface of the boss 19, and the clamp 1 is removed from the boss 19.
3 to prevent it from falling off. Then, by rotating the clamp 13 about the boss 19 and resiliently engaging the hook 17 with the protrusion 20 of the carrier 4,
A needle guide 6 of the printing head 5 is fixed to the pressing part 14.

Further, since the knob 18 and the hook 17 extend in different directions at slightly acute angles, it is easy to maintain the gripping state with two fingers such as the thumb 27 and the index finger 28, and in this state, the tip of the knob 18 By applying external force from your fingertips, you can hook 1 with a small external force.
7 is deformed and removed from the protrusion 20, the clamp 13 is grasped and rotated with two fingers, and the pressing part 14 can be retreated from the printing head 5.
Therefore, the print head 5 can be easily attached and detached. Furthermore, the shaft hole 1 of the clamp 13
5 is fitted into the boss 19 of the carrier 4, the locking pawl 16 integrally formed on the clamp 13 engages the boss 1.
The clamp 13 from the boss 19 engages with the end face of the
By preventing the clamp 13 from falling off, parts for attaching the clamp 13 to the carrier 4 are unnecessary, and the assembly structure and assembly work can be simplified.

Effects of the invention Since this invention is constructed as described above, the printing head is supported by the receiving surface and its relative position to the carrier is determined by the positioning part, and when the shaft hole of the clamp is fitted from one end of the fulcrum shaft, the fulcrum shaft The locking pawl can be elastically engaged with the other end surface to prevent the clamp from falling off from the fulcrum shaft,
Next, by rotating the clamp around the fulcrum shaft, the hook can be elastically engaged with the locking part of the carrier, and the printing head can be pressed against the receiving surface by the pressing part. Because they extend in directions substantially perpendicular to each other, it is easy to maintain the state of picking with two fingers such as the thumb and index finger, and in this state, by applying external force from the fingertips to the tip of the knob, the hook can be held with a small external force. While deforming the clamp and removing it from the locking part, the pressing part can be retracted from the print head by pinching the clamp with two fingers and rotating it, making it easy to attach and remove the print head without requiring any effort. Furthermore, the assembly structure and assembly work can be simplified by eliminating the need for parts for attaching the clamp to the carrier.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of this invention, in which Figure 1 is an exploded perspective view, Figure 2 is a vertical side view, Figure 3 is a front view partially cut away, and Figure 4 is a partially cutaway front view. The figure is a bottom view showing the print head installed with the paper guide removed, FIG. 5 is a plan view showing one conventional example, and FIG. 6 is a longitudinal sectional front view showing another conventional example. 1... Platen, 4... Carrier, 5... Print head, 9, 10... Support (positioning part), 12
... Fixed surface (positioning part), 13 ... Clamp,
14... Pressing part, 15... Shaft hole, 16... Locking claw, 17... Hook, 18... Knob, 19... Boss (fulcrum shaft), 20... Protrusion (locking part).

Claims (1)

[Scope of utility model registration request] A carrier is provided which has a receiving surface for supporting the print head and a positioning part that engages with the print head and moves along the platen, and a fulcrum shaft and a locking part are fixedly provided at a distance from each other on the carrier, a pressing part that sandwiches the print head with the receiving surface and presses it against the receiving surface; a shaft hole located on one side of the pressing part and rotatably fitted to the fulcrum shaft; a locking pawl that faces the opening surface and resiliently engages with the end surface of the fulcrum shaft; a hook that is located on the other side of the pressing portion and resiliently engages with the locking portion; one end; is coupled to the hook and has a knob of a predetermined length extending in a direction substantially perpendicular to the extending direction of the hook, and a clamp integrally formed of an elastic synthetic resin. print head holding device.