JPH0257775B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION This invention relates to a daisy wheel holding device for a printing machine.

Technical background of the invention and its problems Conventionally, a carrier is provided with a rotary drive body that drives a daisy wheel and a hammer frame that holds a hammer, and the hammer frame is opened to insert a daisy wheel between the rotary drive body and the hammer frame. There are devices in which the daisy wheel is held against the rotating drive body by a wheel holder that is inserted and elastically attached to the hammer frame, but even when the hammer frame is opened, the wheel holder protrudes toward the rotating drive body. The distance between the wheel holder and the rotary drive body is narrow, making it difficult to attach and detach the daisy wheel between the two. Since the carrier is equipped with a ribbon cassette and other parts are attached to it, there are limits to the opening angle of the hammer frame.

Purpose of the Invention The present invention was made in view of the above points, and an object of the present invention is to provide a daisy wheel holding device for a printing machine that allows easy attachment and detachment of the daisy wheel even if there is a restriction on the amount of movement of the hammer frame. shall be.

SUMMARY OF THE INVENTION This invention provides a carrier with a rotary drive body and a hammer frame, and a wheel holder that elastically presses a daisy wheel against the rotary drive body on the hammer frame so as to be rotatable and move back and forth in the axial direction.
Furthermore, an operating lever and an actuating body are interlocked and connected to the hammer frame, and the operating lever separates the hammer frame from the rotating drive body, and the operating body is interlocked with the displacement movement of the operating lever at this time to rotationally drive the wheel presser. The daisy wheel is retracted from the body, and therefore, even if the amount of movement of the hammer frame is limited, the rotary drive body and the wheel holder are largely separated from each other, so that the daisy wheel can be easily attached and detached. It is something.

Embodiment of the Invention An embodiment of the invention will be described based on the drawings.
Both ends of a platen 2, a carrier shaft 3, and a guide rail 4 are held by opposing frames 1. A step motor 8 is fixed to a carrier 5 which is slidably held by a carrier shaft 3 and a guide rail 4 and which transmits rotational force via a gear 6 to a gear 7 which is a rotational drive body. A locking portion 10 is formed on one surface of the gear 7 to prevent the daisy wheel 9 from rotating. Further, a hammer frame 11 is attached to the carrier 5 so as to be rotatable about a fulcrum 13 while being biased by a spring 12 in a direction away from the gear 7 . This hammer frame 11 has a printing hammer 14.
is urged in the return direction by a spring 15 and is rotatably mounted. A solenoid 16, which is a drive unit for striking the printing hammer 14, is also fixed to the hammer frame 11.

Next, a shaft 17 is held in the hammer frame 11 so as to be slidable while being biased in one direction by a spring 18, and a wheel holder 19 is rotatably held at the tip of the shaft 17 via a thrust bearing 20. . In addition, the hammer frame 11 includes
The operating lever 21 is urged in the return direction (clockwise) by a torsion spring 22 and is rotatably mounted around a support shaft 23, and an actuating body 25 facing the pressing piece 24 of the operating lever 21. is mounted rotatably around a support shaft 2. One end of this actuating body 25 is in contact with a ring 27 fixed to the rear end of the shaft 17.

The operation lever 21 is formed with a U-shaped locking recess 28 and a V-shaped locking recess 29. Further, the carrier 5 has a locking recess 2.
A stopper shaft 30 that engages with the plates 8 and 29 is installed parallel to the axis of the platen 2.

The daisy wheel 9 is housed and protected in a cassette case 9a which has a large opening at the center of both sides.

In this configuration, the operating lever 21 is biased clockwise by the force of the torsion spring 22, and the locking recess 28 and the stopper shaft 30 engage with each other as shown in FIGS. 1 and 2. In this state, the hammer frame 11 and the operating lever 21 receive a counterclockwise moment about the fulcrum 13 due to the force of the spring 12, but the operating lever 21 is pushed back from the stopper shaft 30 on a line passing through the center of the stopper shaft 30. Because of the force F, the counterclockwise movement of the hammer frame 11 is locked, and the daisy wheel 9 is held between the gear 7 and the wheel holder 19. Further, in this state, component forces F ₁ and F ₂ are generated from the reaction force F, and the engagement force between the locking recess 28 and the stopper shaft 30 can be further strengthened by the component force F ₁ .

When the operating lever 21 is rotated counterclockwise against this component force F ₁ and the force of the torsion spring 22, the locking recess 28 and the stopper shaft 30 are disengaged. Therefore, the hammer frame 11 rotates counterclockwise around the fulcrum 13 due to the force of the spring 12, and the operating lever 21 rotates the actuating body 25 counterclockwise as shown in FIGS. 3 and 4. ,
The wheel holder 19 is retracted from the gear 7 together with the shaft 17.

In this way, not only does the hammer frame 11 separate from the gear 7, but also the wheel presser 19 moves relative to the hammer frame 11 and retreats from the gear 7, so even if the rotation angle of the hammer frame 11 is reduced, the gear 7 A wide space can be provided between the wheel holder 19 and the wheel holder 19. Therefore, the daisy wheel 9 can be attached and detached very easily. Further, in this state, the stopper shaft 30 comes into contact with the locking recess 29, so that the rotation angle of the operating lever 21 and the hammer frame 11 is determined.

Then, when a clockwise operating force is applied to the operating lever 21, a reaction force R acts on the contact portion between the stopper shaft 30 and one edge 31 of the locking recess 29, and from this reaction force R, a component force R ₁ , R ₂ are generated, and R ₂ acts on the center of the support shaft 23 to give a moment to the hammer frame 11 in the clockwise direction about the support shaft 13 . As a result, the hammer frame 11 is rotated toward the platen 2 against the force of the spring 12, and the locking recess 28 of the operating lever 21 and the stopper shaft 30 are engaged again. The wheel holder 19 is returned together with the shaft 17 by the force of the spring 18, and presses the daisy wheel 9 against the gear 7.

Effects of the Invention Since the present invention is configured as described above, when the hammer frame is separated from the rotary driving body, the wheel holder is moved relative to the hammer frame to move between the wheel holder and the rotary driving body. The carrier can be made wider, so the daisy wheel can be easily attached and detached, and the carrier can be made smaller by limiting the amount of movement of the hammer frame. .

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is a longitudinal side view showing the daisy wheel set, Fig. 2 is a partially enlarged longitudinal side view, Fig. 3 is a longitudinal side view showing the hammer frame separated from the gear, and Fig. 4 is a longitudinal side view showing the condition in which the daisy wheel is set. It is a vertical side view which enlarged a part. 2...Platen, 5...Carrier, 7...Gear (rotation drive body), 9...Daisy wheel, 11...
...Hammer frame, 14...Printing hammer, 16...
...Solenoid (drive part), 19...Wheel holder,
21... Operating lever, 25... Operating body.

Claims (1)

[Claims] 1. A rotary drive body to which a daisy wheel is detachably connected to a carrier that moves along a platen is provided, and a hammer frame that holds a printing hammer and a drive unit that drives the printing hammer is attached to the rotary drive body. A wheel holder is provided so as to be able to freely approach and move away from the hammer frame, and a wheel holder that is urged in one direction by the hammer frame and holds the daisy wheel between it and the rotary drive body is provided so as to be rotatable and move back and forth in the axial direction. The hammer frame is movably attached to the frame by urging the operating lever that is separated from the rotary drive body in the return direction, and an actuator that moves the wheel holder away from the rotary drive body in conjunction with the operating lever. A daisy wheel holding device for a printing machine, characterized in that it is equipped with a daisy wheel holding device.