JPH0225628Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a type wheel attachment mechanism for an impact serial printer device.

In recent years, impact serial printer devices have been widely used in terminals and the like of various banking systems. Type wheel type typefaces are often used in these printer devices.

Such a printer device not only speeds up printing but also
There is a need to ensure printing quality, and it is necessary to easily and reliably replace type wheels that have reached the limit of their use.

[Conventional technology]

The conventional technology will be explained below with reference to FIGS. 2 to 5.

Fig. 2 is a side view illustrating the outline of an impact serial printer device using a type wheel, Fig. 3 is a plan view of the type wheel, Fig. 4 is a side sectional view of the mounting part of the type wheel, and Fig. 5 is a fixed view. FIG. 3 is an enlarged perspective view of the component.

As shown in FIG. 2, the printer device has a cylindrical platen 1, and shaft members 2 and 3 are provided parallel to the platen 1. A carrier 4 is slidably fitted and supported on the shaft members 2 and 3,
A space motor (not shown) is connected to the carrier 4 via a belt 5, and by appropriately rotating the space motor in forward and reverse directions, the carrier 4 can be freely moved in the longitudinal direction of the platen 1.

A bracket 7 is provided on the carrier 4 so as to be rotatable about a shaft 8.
A rotation motor 9 is fixed to.
A type wheel 12 is attached to a shaft 11 at the front (left side in the figure) of the rotation motor 9 so as to face the platen 1. Further, a hammer magnet 13 having a hammer 13a is fixed to the bracket 7 so as to face the platen 1 via the type wheel 12. By energizing and releasing the hammer magnet 13, the hammer 13a is moved toward the platen. It can be made to stand out freely.

Therefore, when printing on printing paper wrapped around the platen 1, the rotation motor 9 is driven, the type wheel 12 is rotated, and the predetermined type 14 and the hammer 13 of the hammer magnet 13 are rotated.
After that, the hammer magnet 13 is energized, the hammer 13a is made to protrude in the direction of the platen 1, and the protruding force of the hammer 13a causes the type 14 to be printed on the printing paper on the platen 1 with ink (not shown). Pressure printing is performed using a ribbon or the like.

After printing is completed, the excitation of the hammer magnet 13 is released, the hammer 13a is moved back, and the printer enters a standby state for the next printing operation.

In this way, the desired characters 14 in the type wheel 12 are selected and printed one after another, and
A printing operation is performed by driving the space motor to appropriately move the carrier 4 in the longitudinal direction of the platen 1.

However, the type wheel 12 made of synthetic resin or the like has a limited lifespan, and must be replaced with a new one from time to time to ensure high quality printing.

Therefore, the type wheel 12 is detachable from the shaft 11 of the device, and as shown in FIG. 3, the type wheels 14 are arranged radially along the disk-shaped outer periphery in one to two upper and lower stages. ing. A circular hole 15 that engages with the shaft 11 of the device is provided in the center thereof, and a positioning hole 16 is provided near the circular hole 15.

In addition, the type wheel 12 has two upper and lower tiers of type.
In the case of a printing device using a printer, the shaft 11 is swingably connected to the main body by a flexible joint, and the swing mechanism is configured to select and use upper and lower characters as appropriate. There is.

FIG. 4 shows an enlarged side view of the attachment part of the type wheel 12. The type wheel 12 has the protrusion 18 of the fixing plate 17 provided at the tip of the shaft 11 in the positioning hole 16, and the tip of the shaft 11 of the device. The shaft 11 is inserted into the circular hole 15 and fixed part 19 is installed vertically in the circular hole 15.
Press to fix it to the shaft 11.

As shown in FIG. 5, the fixed part 19 includes a cylindrical portion 19a formed of an elastic member such as rubber;
It is composed of a flange 19b provided at one end and a knob 19c made of a hard material such as synthetic resin bonded to the other end of the cylindrical portion 19a.
The axial center of the type wheel 9a is aligned with the center of the circular hole 15 of the type wheel 12, and the type wheel 12 is attached.

The inner diameter of the cylindrical portion 19a is smaller than the outer diameter of the shaft 11, so when inserting the type wheel 12 onto the shaft 11, hold the knob 19c and insert the fixed part 19 into the shaft 1.
Press it in by pressing 1.

[Problem that the invention attempts to solve]

As explained above, in order to insert the type wheel into the device, it is necessary to press-fit a fixed part into the shaft of the device, which is difficult to insert, and also makes it difficult to confirm whether the type wheel has been inserted securely into the device. It is difficult to confirm whether the fixed parts are the same, and the fixing parts are made of different materials, rubber and synthetic resin, making them expensive. Furthermore, JP-A-54-140613 proposes a mechanism in which a ring-shaped spring plate with a pawl is built into the inside of the cap, and the type wheel is attached to the rotary shaft by engaging the pawl with a groove on the rotary shaft. has been done. This mechanism has a complicated structure because it consists of two parts, an annular spring plate and a cap that houses it, and also increases costs because it cannot be integrally molded.

[Means for solving problems]

The present invention has been made to solve the above problems, and includes a type wheel mounting mechanism in which a type wheel is attached to a rotating shaft by a fixed part, the fixed part being cylindrical and made of synthetic resin, A cylindrical portion having a plurality of tongues whose free ends are separated by slits, and a tip of each tongue protruding inward perpendicularly to the rotational shaft and engaged with a groove in the rotational shaft. and a claw part that is provided on the same side as the claw part and at the tip of the cylindrical part other than the tongue piece so as to protrude outward perpendicularly to the rotation axis, and is separate from the fixed part. The type wheel has a jaw that presses the hub, and a plurality of knobs that are provided at the tip of the cylindrical part on the opposite side of the jaw and protrude outward perpendicularly to the rotation axis. It is integrally formed.

[Effect]

The fixed part has a jaw part that presses the type wheel, a claw part that engages with the groove of the rotating shaft, and a knob part that are integrally formed on the cylindrical part, so it can be constructed with only one part, and the cost is reduced. You can try to bring it down.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1a is a side sectional view of the attachment part of the type wheel of the present invention, and FIG. 1b is an enlarged perspective view of the fixing part shown in FIG. 1a.

In the figure, 11' is the axis of the device, 12' is the type wheel, 19' is the fixed part, 20 is the claw part, and 21
is a groove. Identical parts are designated by the same reference numerals throughout the figures.

As shown in FIG. 1a, the mounting portion of the type wheel 12' has a circular hole 15 which engages with the shaft 11' of the device.
A fixing member 19' made of synthetic resin is provided in the circular hole 15.

As shown in FIG.
A plurality of claws 20, each of which has a tip end of a tongue piece 23 protruding in the inner radial direction, and a plurality of claws 20, which are formed by providing a plurality of claws 20 and an end of the cylindrical part 19a' on the claw part 20 side, are arranged perpendicularly to the axial direction of the cylindrical part 19a'. A plurality of flanges 1 are formed to protrude outward as shown in FIG.
9b', and a plurality of knobs 19c' formed on the other end of the cylindrical part 19a' to protrude outward perpendicular to the axial direction of the cylindrical part 19a'.
It is fixed to the type wheel 12' so that the axis of the cylindrical part 19a' and the circular hole 15 coincide with each other at b'.

On the other hand, at the tip of the shaft 11' of the device, a groove 21 is carved along the outer periphery of the shaft 11', as shown in FIG.

The type wheel 12' having such a configuration has the shaft 1
The protrusion 18 of the fixing plate 17 provided at the tip of the fixing plate 1' is inserted into the positioning hole 16, and the tip of the shaft 11' of the device is inserted into the circular hole 15.
The groove 21 of the shaft 11' is gripped by the claw portion 20 of the shaft 9' to fix it to the shaft 11.

[Effect of idea]

As explained above, by applying the printing mechanism having a means for inserting the type wheel type type body of the present invention, insertion becomes easy, and insertion can be confirmed by feeling that the claw part engages with the groove. Furthermore, since the fixing parts are integrally molded from synthetic resin, they can be manufactured at low cost.

[Brief explanation of the drawing]

Figure 1a is a side cross-sectional view of the attachment part of the type wheel of the present invention, Figure 1b is an enlarged perspective view of the fixing part in figure a, and Figure 2 is an outline of an impact serial printer device using the type wheel. Fig. 3 is a plan view of the type wheel; Fig. 4 is a side view illustrating the type wheel;
The figure is a side cross-sectional view of the mounting part of the type wheel.
The figure is an enlarged perspective view of the fixing component. In the figure, 11, 11' are the shafts of the device, 12,
12' is a type wheel, 15 is a circular hole, 16 is a positioning hole, 17 is a fixing plate, 18 is a protrusion, 19,1
9' is a fixed part, 20 is a claw part, and 21 is a groove.

Claims (1)

[Scope of Claim for Utility Model Registration] In a type wheel mounting mechanism in which a type wheel is attached to a rotating shaft by a fixed part, the fixed part 19' has a cylindrical shape made of synthetic resin, and the free end is separated by a slit 22. a cylindrical portion 19a' having a plurality of tongues 23; a cylindrical portion 19a' having a plurality of tongues 23;
1, and a claw part 20 that is provided on the same side as the claw part and at the tip of the cylindrical part other than the tongue piece so as to protrude outward perpendicularly to the rotational axis, and A jaw part 19b' that presses the hub of the type wheel which is separate from the part, and a jaw part 19b' that is provided at the tip of the cylindrical part on the opposite side to the jaw part and protrudes outward so as to be perpendicular to the rotation axis. A type wheel mounting mechanism characterized in that a plurality of knobs 19c' are integrally formed.