JPH0235481Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to a printing wheel storage case used in a daisy wheel printer.

Technical background of the invention and its problems There is a cassette type daisy wheel printer in which the printing wheel is housed in a storage case in order to attach and detach the printing wheel.
Since conventional storage cases are formed by joining together a plurality of members, they are troublesome to assemble and must be disassembled to take in and out the print wheel.

Purpose of the invention This invention was made in view of the above points, and the object is to provide a printing wheel storage case that does not require assembly and disassembly and allows the printing wheel to be easily taken in and out.

Summary of the invention In this invention, the printing wheel is housed in a space surrounded by a flat receiving surface, a peripheral wall, and a pressing surface, the peripheral wall restricts the movement of the printing wheel in the planar direction, and both sides of the printing wheel are connected to the receiving surface and the pressing surface. supported by the surface,
This prevents the printing wheel from falling off, and when installing the printing wheel, the center of the printing wheel is held between the rotary drive unit and the clamp. For this purpose, the center of the printing wheel is left open, and the printing hammer is The upper part of the receiving surface is open to interfere with the printing wheel, and the area of the presser surface is limited so that it faces the lower half of the printing wheel on the type side side. The receiving surface, the peripheral wall, and the holding surface can be easily integrally molded by forming a die-cutting opening facing the holding surface in the receiving surface having a large area. Therefore, the structure is such that the troublesome task of assembling and disassembling the printing wheel when putting it in and taking it out can be eliminated.

Embodiment of the invention An embodiment of the invention will be described based on the drawings.
1 to 4 are drawings showing a case 2 that houses a printing wheel 1. FIG. This case 2 is made by integrally molding a receiving surface 3 with a large area, an annular peripheral wall 4, and a holding surface 5 from synthetic resin. During molding, the receiving surface 3 has an opening 6 for a hammer, an opening 7 for a clamp, and an opening 8 for a sensor. and a die-cutting opening 9 facing the presser surface 5
A knob 10 and a relief part 11 located on one side of the lower part are formed, and a notch 12 is formed in the lower part of the peripheral wall 4.
is formed. Also, the presser surface 5 is the print wheel 1
The area is limited so that it faces the outer periphery of the lower half of the typeface side. The printing wheel 1 has a large number of petal-shaped type parts 13 on its outer periphery, and a large number of locking holes 15 and one sensor hole 16 are formed around a ring 14 inserted in the center.

Next, the structure of the daisy wheel printer is shown in FIGS. 6 and 7. A carrier 20 is provided which is held by a carrier shaft 17 and a guide rail 18 and moves along a platen 19.
This carrier 20 is provided with a step motor 22 to which a gear 21 is directly connected, and a gear 23 that meshes with the gear 21. This gear 23 is formed with a protrusion (not shown) that engages with the locking hole 15. Also, the carrier 20 has a hammer frame 24.
is urged by a spring 25 in a direction away from the platen 19 and is rotatably mounted around a support shaft 26 . A holding part 27 for supporting the lower part of the case 2 is formed at the lower part of the hammer frame 24, and a magnet 28 and a printing hammer 29 driven by the magnet 28 are held at the upper part. Also, the hammer frame 24 has a gear 3.
A clamp 30 facing the center of the gear 23 is rotatably held by a spring 31 so as to be slidable. Further, an operating lever 33 biased toward the platen 19 by a torsion spring 32 is rotatably attached to the hammer frame 24 by a support shaft 34. This operating lever 33 is formed with a recess 36 that engages with a stopper shaft 35 installed on the carrier 20. Further, a leaf spring 37 is attached to the carrier 20 and is pressed against the pressing surface of the case 2.

In such a configuration, as shown in FIG. 6, the hammer frame 24 is separated from the gear 23 by the force of the spring 25 when the recess 36 of the operating lever 33 and the stopper shaft 35 are disengaged. In this state, the case 2 and the printing wheel 1 are inserted into the holding part 27. When the operating lever 33 is rotated clockwise, a component of the force caused by the contact between the operating lever 33 and the stopper shaft 33 acts on the center of the support shaft 34, so that the hammer frame 2
4 rotates clockwise around the support shaft 26, whereby the stopper shaft 35 engages with the recess 36 and the hammer frame 24 is moved to the gear 23 as shown in FIG.
to press. As a result, the printing wheel 1 is held between the clamp 30 and the gear 23. Printing is carried out by driving the step motor 22, rotating the printing wheel 1, so that the desired character portion 13 faces the printing hammer 29, and energizing the magnet 28. Incidentally, the selection of the type portion 13 is performed by detecting the sensor hole 16 of the printing wheel 1 by a sensor (not shown) provided on the hammer frame 24.

To remove the case 2, rotate the operating lever 33 counterclockwise against the force of the torsion spring 32 to disengage the recess 36 and the stopper shaft 35, and the spring 25 moves the hammer frame 24.
pull away from gear 23. At this time, the leaf spring 37
presses the presser surface 5, the engagement between the gear 23 and the printing wheel 1 is immediately disengaged, making it possible to easily take out the case 2.

Incidentally, as shown in FIG. 5, by forming a protrusion 38 on the hammer frame 24 located in the relief part 11 of the case 2, it is possible to prevent the mistake of inserting the case 2 in the wrong direction.

Since the area of the holding surface 5 of the case 2 is limited, the center and upper half of the printing wheel 1 are largely open. Therefore, the printing wheel 1 housed in the case 2 is prevented from moving in the planar direction by the peripheral wall 4, and is prevented from floating from the receiving surface 3 by the pressing surface 5, but it is difficult to take out the printing wheel 1 and return it to the case 2. can be easily stored by slightly tilting the printing wheel 1. Since the case 2 is also integrally molded, there is no need to disassemble it, and the presence of the die-cutting opening 9 allows for easy molding with a mold having a unidirectional die-cutting structure.

Note that the clamp opening 7 may be formed independently without communicating with the sensor opening 8.

Effects of the device As mentioned above, this device integrally molds the receiving surface, peripheral wall, and presser surface, so there is no need to assemble and disassemble the case when inserting and removing the printing wheel. Since the surface is limited to a large area that leaves the center and upper half of the printing wheel open, it is possible to easily take it in and out by slightly tilting the printing wheel, and furthermore, the receiving surface faces the presser surface. By forming the die-cutting opening, the receiving surface, the peripheral wall, and the holding surface can be easily integrally formed with a simple mold structure.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view of the case and printing wheel, Figure 2 is a front view of the case, and Figure 3 is X-X in Figure 2.
Figure 4 is a cross-sectional view of the Y-Y line in Figure 2, Figure 5 is a front view of the case housing the printing wheel, and Figure 6 is a longitudinal side view showing the process of installing the printing wheel. 7 are longitudinal sectional side views showing the state in which the print wheel is attached. 1... Printing wheel, 3... Receiving surface, 4... Peripheral wall, 5... Pressing surface, 6... Hammer opening, 7...
Opening for clamp, 8... Opening for sensor, 9... Opening for die cutting, 29... Printing hammer, 30... Clamp.

Claims (1)

[Scope of utility model registration request] A flat receiving surface facing the back surface of the printing wheel, a peripheral wall surrounding the outer periphery of the printing wheel, and a center and upper half of the printing wheel that are opened to form an outer periphery of approximately the lower half of the printing wheel on the type side side. A clamp opening that makes the clamp face the center of the printing wheel, a sensor opening that makes the sensor face the center of the printing wheel, and a printing hammer that faces the print wheel. A printing wheel storage case characterized in that a hammer opening facing the upper outer periphery of the printing wheel and a die cutting opening facing the presser surface are formed in the receiving surface.