JPH0710605B2 - Printer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device such as a typewriter or a printer using a petal type printing disk (hereinafter referred to as a daisy wheel) as a printing means.

2. Description of the Related Art A conventional printing device using a daisy wheel will be described below.

FIG. 3 and FIG. 4 are a plan view and a perspective view of a main part of a conventional printing device, respectively. (However, a hammer solenoid, which will be described later in FIG. 4, is not shown.) In the drawing, 1 is a carriage frame, and this carriage frame 1 is indicated by an arrow by a shaft 2 fixed to a main frame (not shown). It is slidably supported in the A direction. A wheel gear 3 is fixed to the wheel shaft 9 and a fixing portion 9a for fixing the daisy wheel 4 having a large number of type pieces 13 formed on the outer periphery thereof.
Is equipped with. The wheel shaft 9 is pivotally supported on the carriage frame 1. Reference numeral 6 is a motor for rotating the daisy wheel, and the pinion 5 is fixed to the rotation shaft 6a thereof. The bearing portion 7 of the motor 6 is fitted in the bearing insertion hole 1b of the motor mounting plate 1a provided on the carriage frame 1, and the flange portion 6c of the motor is screwed to the motor mounting plate 1a by screws 8,8. Is fixed by. Reference numeral 9 is an elongated hole for adjusting the screwing position. The elongated hole 9 is formed concentrically with the bearing insertion hole 1b and has an arc shape. 10 is a hammer for hitting the print piece, hammer shaft
It is rotatably held at 11. Reference numeral 12 is a hammer solenoid, and its 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 described.

First, the type selection motor 6 is driven, and the pinion 5 is rotated by a predetermined amount to rotate the wheel gear 3 by a predetermined amount, so that a desired type piece is positioned at the strike position of the hammer 10. And in that state the hammer solenoid
Printing is performed by energizing 12 and displacing the hammer 10 in the direction of arrow B through the plunger 12a, and pressing the above-mentioned type piece against the printing paper through an ink ribbon (not shown).

Problems to be Solved by the Invention By the way, a V groove is formed in the tip portion 10a of the hammer 10 and a V mountain is formed on the back surface of the type piece, and printing is performed after both are engaged. However, the accuracy of the positional relationship between the two must be high.
Otherwise, the printing piece is displaced in the direction of the arrow θ during the printing operation, so that the printed character becomes unclear. Therefore,
As shown in FIGS. 3 and 4, the carriage frame 1
The insertion hole for the screw 8 is a long hole so that the motor mounting position on the motor mounting plate 1a can be adjusted. The adjustment is done by loosening the two screws 8 and 8, and the adjustment operation must be performed while ensuring good engagement between the pinion and the wheel gear, which is a complicated task. I had a problem.

In addition, the angle adjustment of the daisy wheel is generally about two print characters (7.2 ° if there are 100 print pieces), but if the angle adjustment is 7.2 °, the motor 6 uses the wheel gear 3 and the pinion 5. It must be rotated more by the gear ratio of and. That is, assuming that the gear ratio is “5”, the motor 6 must be rotated by 7.2 × 5 = 36, that is, 36 °, and the drilling range of the slot 9 becomes very large. There is also a problem that the placement position is greatly restricted.

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

Operation With the above configuration, the distance between the center of the wheel gear and the center of the pinion of the motor is constant regardless of the work of adjusting the position of the motor, so that the workability is extremely good.

Embodiment An embodiment of the printing apparatus of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view of the main part of the printer, and FIG. 2 is an assembly drawing thereof. A hammer solenoid, which will be described later, is not shown in FIG.

In the figure, reference numeral 15 denotes a carriage frame, and the carriage frame 15 is supported by a shaft 28 fixed to a main frame (not shown) so as to be slidable in the arrow A direction. A wheel gear 22 is fixed to the wheel shaft 21, and a fixing portion 22 for fixing the daisy wheel 23 having a large number of type pieces 29 formed on the outer periphery thereof.
equipped with a. The wheel shaft 21 is rotatably supported by a wheel bearing 18, and a stopper 24 prevents the wheel shaft 21 from coming out of the wheel bearing 24. Also,
The wheel bearing 18 is inserted into a bearing through hole 15a formed in the carriage frame 15, and a constricted portion 18a of the wheel bearing 18 penetrates the through hole 15b, and is prevented from coming out of the carriage frame 15 by a stopper 20a. Is being done.

The flange 19 of the motor is provided with a through hole 19a into which the constricted portion 18a of the wheel bearing 18 is inserted, and the flange 19 is sandwiched between the wheel bearing 18 and the side plate 15d of the carriage frame 15. It Further, the flange 19 is provided with a screw hole 19b. And the motor 17
Is fixed to the frame side plate 15d by screws 20a. Incidentally, 15c is an elongated hole through which the screw 20a passes, and the through hole 15
It is formed in an arc shape around b.

Reference numeral 25 is a hammer for hitting a print piece, which is rotatably held by a hammer shaft 26. 27 is a hammer solenoid, and its plunger 27a drives the hammer 25 in the direction of arrow B when energized.

Regarding the printing apparatus of the present embodiment configured as described above,
The printing operation will be described.

First, the type selection motor 17 is driven, and the pinion 16 is rotated by a predetermined amount to rotate the wheel gear 22 by a predetermined amount so that a desired type piece is positioned at the hammering position of the hammer 25. And in that state the hammer solenoid
Printing is performed by energizing 27 and displacing the hammer 25 in the direction of arrow B through the plunger 27a, and pressing the above-mentioned character piece against the character paper through an ink ribbon (not shown).

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

Next, a procedure for position adjustment work of the daisy wheel 23 will be described.

To adjust the position of the daisy wheel, first adjust the motor 17
Loosen the screw 20a that secures the to the carriage frame,
The motor 17 is rotated about the wheel bearing 18 by a predetermined amount. Then, after adjusting the position, insert the screw 20a into the through hole 1
The motor is fixed to the side plate 15d of the carriage frame 15 by screwing into the screw hole 19b provided in the flange 19 of the motor 17 via 5c. This completes the daisy wheel position adjustment work.

By the way, at the time of this position adjustment work, since the motor 17 rotates about the wheel bearing 18, the distance between the center of the rotation and the center of the pinion 16 remains unchanged, that is, the wheel bearing. Since the position adjustment is performed while keeping the distance between the center of the wheel shaft 21 and the center of the pinion 16 inserted into the 18 constant, the state of meshing between the wheel gear 22 and the pinion 16 does not change and remains constant. To be kept.

Therefore, in the position adjustment work, only the screw 20 needs to be warmed, and the workability is extremely good. Also, let's assume that the daisy wheel is for two prints (for example, 7.2 °).
When adjusting, it is sufficient to rotate the motor 17 by 7.2 ° around the wheel shaft 18, and since the adjustment angle of the daisy wheel and the rotation angle of the motor match, the workability is further improved. It will be good. Also, it is only necessary to provide the long hole 15c so that the motor can rotate by the adjustment angle of the daisy wheel, so that the motor must be rotated several times the adjustment angle of the daisy wheel as in the conventional case. In comparison, the degree of freedom of the arrangement position of the motor is also greatly improved.

EFFECTS OF THE INVENTION As is apparent from the above invention, the printing apparatus of the present invention includes a wheel shaft rotatably attached to the frame of the carriage, and a first gear attached to the wheel shaft. The second that drives this first gear
And a motor for rotationally driving the second gear, one end of a flange of the motor is arranged coaxially with the wheel shaft, and the motor is rotatable about the one end. As a result, the work of adjusting the angle of the daisy wheel can be performed very easily, and the degree of freedom in the position of arranging the motor can be significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of the printing device of the present invention, FIG. 2 is an assembly view of the same part, and FIG. 3 is a front view of the main part of a conventional printing device. The figure is a perspective view of a main portion of the conventional example. 15 …… Carriage frame 15a, 15b …… Through hole 15c …… Oval 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 27a …… Plunger, 28 …… Shaft 29 …… Type piece, 30 …… Screw

Claims (2)

[Claims] 1. A wheel shaft rotatably attached to a frame of a carriage, a first gear attached to the wheel shaft, a second gear for driving the first gear, and a second gear. And a motor that rotationally drives the gear, wherein one end of a flange of the motor is arranged coaxially with the wheel shaft, and the motor is configured to be rotatable about the one end. Printing device. 2. A wheel shaft is rotatably supported by a bearing, and one end of a motor flange is rotatably supported by the bearing.
The printing device according to the item.