JPS62238770A - Printer - Google Patents

Abstract

PURPOSE:To enable angle adjustment for a daisy wheel to be extremely easily performed and enhance the degree of freedom of the location of a motor, by disposing an end part of a flange of the motor coaxially with a wheel shaft so that the motor can be turned with the end part as a center. CONSTITUTION:When performing position adjustment, a motor 17 is turned by a predetermined amount with a wheel shaft support 18 as a center. During the adjustment, the distance between the center of turning and the center of a pinion 16 remains unchanged, that is, the distance between the center of a wheel shaft 21 fitted into the support 18 and the center of the pinion 16 is kept constant, so that the meshing condition of a wheel gear 22 and the pinion 16 is kept unchanged. Therefore, only a screw 30 must be untightened in the position adjustment, and favorable operability is ensured. In addition, it is sufficient to provide such a slot 15c that the motor can be turned by an amount corresponding to an adjusting angle of the daisy wheel, and accordingly, the degree of freedom of the location of the motor is enhanced as compared with that in a conventional construction wherein the motor must be turned by several times the adjusting angle of the daisy wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing device such as a typewriter or printer that uses a petal-shaped type disk (hereinafter referred to as a daisy wheel) as a printing means.

BACKGROUND OF THE INVENTION A conventional printing device using a daisy wheel will be described below.

3 and 4 are a plan view and a perspective view, respectively, of the main parts of a conventional printing device. (However, a hammer solenoid, which will be described later, is not shown in FIG. 4.) In the figure, 1 is a carriage frame, and this carriage frame 1 is connected to l\ Supported so as to be slidable in the force direction. 3 is a wheel gear which is fixed to the wheel shaft 9 and has a large number of type pieces 1 on the outer periphery.
3 is provided with a fixing portion 9a for fixing the daisy wheel 4 formed thereon. And the wheel shirt;・9
is pivotally supported by the carriage frame 1. Reference numeral 6 denotes a motor for driving the rotation of the daisy wheel, and a pinion 5 is fixed to the rotating shaft 6a. Further, the bearing part 7 of this motor 6 is fitted into the insertion hole 1b of the motor mounting plate 1a provided on the carriage frame 1, and the motor flange part 6C is fitted into the motor mounting plate 1a. 1a with screws 8, 8.

Note that 9 is an elongated hole for adjusting the screw position, and this elongated hole 9 is formed concentrically with the bearing insertion hole 1b and has an arc shape. 10 is a hammer for hitting type pieces, and is rotatably held on a hammer shaft 11. 12 is a hammer solenoid whose plunger 12a drives the hammer 10 in the direction of arrow B when energized.

The printing operation of the conventional printing device configured as described above will be explained.

First, the motor 6 for type selection is driven to rotate the pinion 5 by a predetermined amount, thereby rotating the wheel gear 3 by a predetermined amount to position a desired type piece at the striking position of the hammer 10. Then, in this state, the hammer solenoid 12 is energized to displace the hammer 10 in the direction of arrow B via the plunger 12a, and the type piece is pressed against the printing paper via an ink ribbon (not shown), thereby printing. It will be done.

Problems to be Solved by the Invention By the way, a V-groove is formed on the tip 10a of the hammer 10, while a V-ridge is formed on the back of the type bead, and printing is performed after the two engage. However, the positional relationship between the two must be highly accurate. Otherwise, the type piece would shift in the direction of the arrow θ during the printing operation, and the printed characters would therefore become unclear. Therefore, as shown in FIGS. 3 and 4, the insertion hole for the screw 8 is made into an elongated hole so that the motor mounting position of the carriage frame 1 and the motor mounting plate 1a can be adjusted. Adjustment is done by loosening two screws 8.8, which is a complicated process as the adjustment must be made while ensuring good engagement between the binion and the wheel gear. It had some problems.

Additionally, the angle of the daisy wheel is generally adjusted by two characters (
If there are 100 type pieces, the angle is 7.2°), but if you want to adjust the angle by 7.2°, the motor 6
must be rotated an additional amount corresponding to the gear ratio of wheel gear 3 and pinion 5. In other words, if the gear ratio is set to "5"
”, the motor 6 must be rotated by 7.2 x 5 = 36, that is, 36'b, and the drilling range of the elongated hole 9 will be very wide. There was also the problem of receiving the test.

Means for Solving the Problems In order to solve the above problems, the printing device of the present invention includes a wheel shaft rotatably attached to the frame of the carriage, and a first wheel shaft attached to the wheel shaft.
a gear, a second gear that drives the first gear, and a motor that rotationally drives the second gear, one end of the flange of the motor being disposed coaxially with the wheel shaft, Moreover, the motor is configured to be rotatable around the one end.

Effect 1: With the above configuration, the distance between the center of the wheel gear and the center of the pinion of the motor remains constant regardless of the motor position adjustment work, resulting in extremely good workability.

Embodiment Hereinafter, one embodiment of the printing apparatus of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view of the main parts of the printing device, and FIG. 2 is an assembled view thereof. Note that a hammer solenoid, which will be described later, is not shown in FIG.

In the figure, 15 is a carriage frame, and this carriage frame 15 is a main frame (not shown).
It is supported slidably in the direction of the arrow by a shaft 28 fixed to.

A wheel gear 22 is fixed to the wheel shaft 21 and has a fixing portion 22a for fixing a daisy wheel 23 having a large number of type pieces 29 formed on its outer periphery. The wheel shaft 21 is supported by a wheel bearing 18, and is prevented from coming out from the wheel bearing 24 by a stopper 24. Further, the wheel bearing 18 is connected to the carriage frame 15.
The bearing drilled in the wheel bearing 18 is inserted into the through hole 15a, and the constricted portion 18a of the wheel bearing 18 is inserted into the through hole 15b.
and is prevented from coming out from the carriage frame 15 by a stopper 20a.

The wheel bearing 18 is attached to the flange 19 of the motor.
A through hole 19a into which the fin portion 18a is inserted is formed in the flange 19, and the flange 19 is sandwiched between the wheel bearing 18 and the side plate 15d of the carriage frame 15. The motor 17 is fixed to the frame side plate 15d by a screw 20a.
0a is a long hole passing through, and is formed in an arc shape with the through hole 15b as the center.

25 is a hammer for hitting type and space, and is rotatably held on a hammer shaft 26.

27 is a hammer solenoid, and its plunger 2
7a drives the hammer 25 in the direction of arrow B when energized.

Regarding the printing device of this embodiment configured as described above,
The printing operation will be explained.

First, the motor 17 for type selection is driven, and the pinion 16
By rotating the wheel gear 22 by a predetermined amount, the desired type and character are positioned at the striking position of the hammer 25. In this state, the hammer solenoid 27 is energized to displace the hammer 25 in the direction of arrow B via the plunger 27a, and printing is performed by pressing the type piece against the printing paper via an ink ribbon (not shown). Ru.

A V groove is formed on the tip 25a of the hammer 25, and a V ridge is formed on the back surface of the type piece, and printing is performed after the two are engaged.

Next, the procedure for adjusting the position of the daisy wheel 23 will be explained.

To adjust the position of the daisy wheel, first loosen the screw 20a fixing the motor 17 to the carriage frame, and rotate the motor 17 a predetermined amount about the wheel bearing 18. After adjusting the position, screw 2
0a to the flange 19 of the motor 17 through the through hole 15c.
The motor is fixed to the side plate 15d of the carriage frame 15 by screwing it into the screw hole 19b provided in the carriage frame 15. This completes the daisy wheel position adjustment work.

By the way, during this position adjustment work, since the motor 17 rotates around the wheel bearing 18, the distance between the center of rotation and the center of the pinion 16 remains unchanged. Since the position adjustment is performed while the distance between the center of the wheel shaft 21 inserted into the pinion 18 and the center of the pinion 16 is kept constant, the state of engagement between the wheel gear 22 and the pinion 16 does not change and remains constant. It is maintained.

Therefore, in the above-mentioned position adjustment work, it is only necessary to loosen the screw 20, and the workability becomes extremely good.

Also, suppose the daisy wheel is 2 characters long, for example 7.2.
°) When attempting to adjust, it is only necessary to rotate the motor 17 by 7.2 degrees around the wheel shaft 18, and since the adjustment angle of the daisy wheel and the rotation angle of the motor match, it is even more The workability is improved. In addition, it is sufficient to provide an elongated hole 15c so that the motor rotates by the adjustment angle of the daisy wheel, instead of the conventional method in which the motor has to be rotated several times the adjustment angle of the daisy wheel. In comparison, there is also the effect that the degree of freedom in the arrangement position of the motor is greatly improved.

Effects of the Invention As has been made clear from the above explanation, the printing device of the present invention includes a wheel shaft rotatably attached to the frame of the carriage, a first gear attached to the wheel shaft, The second gear that drives this first gear
gear, and a motor that rotationally drives the second gear, one end of the flange of the motor is arranged coaxially with the wheel shaft, and the motor is configured to be freely rotatable about the one end. This makes it extremely easy to adjust the angle of the daisy wheel, and the degree of freedom in arranging the motor can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of an embodiment of the printing device of the present invention, FIG. 2 is an assembled view of the main parts, FIG. 3 is a front view of the main parts of a conventional printing device, and FIG. The figure is a perspective view of the main parts of the conventional example. 15...Carriage frame 15a, 15b...Through hole 15c...Long hole 15d...Side
Plate 16...Pinion 17...Motor 18...Wheel bearing 19...
・Flange 19a...Through hole 19b...
...Screw hole 20...Stopper 21...
...Wheel shaft 22 ...Wheel gear
22a... Fixed part 23... Daisy wheel 24... Stopper 25... Hammer 26... Hammer shaft 27...・Hammer solenoid 27 a...Plunger 28...
・Shaft 29... Type piece 30...
...Name of Neji's agent Patent attorney Toshio Nakao and 1 other person
Figure 1 Part 3

Claims (2)

[Claims] (1) A wheel shaft rotatably attached to the frame of the carriage, a first gear attached to this wheel shaft, and a second gear that drives the first gear.
gear, and a motor that rotationally drives the second gear, one end of the flange of the motor is arranged coaxially with the wheel shaft, and the motor is configured to be freely rotatable about the one end. A printing device characterized by: (2) The printing device according to claim 1, wherein the wheel shaft is rotatably supported by a bearing, and one end of the flange of the motor is rotatably supported by the bearing.