JPS6031988A - Printer driver - Google Patents

Abstract

PURPOSE:To enable to obtain sufficient reliability in a high-speed action or the like, by a method wherein rotation of a single driving motor is transmitted to a screw shaft and a rotary nut part by selecting the first and second clutches, thereby bringing a movable part into forward and reverse rectilinear motions. CONSTITUTION:When a shading coil type motor 21 capable of rotating in one direction is rotated, gears 22, 25, 27, 28 and a rotary shaft 26 are rotated. When only a clutch 23 is engaged, a movable base 36 is moved in the direction of an arrow (a) by rotation of a right-screw screw shaft 24, and when only a clutch 29 is engaged, the base 36 is moved at a low velocity in the direction of an arrow (b) by the 1/2-speed rotation of the nut part 30 through the gears 22, 25, the shaft 26 and the gears 27, 28. When both of the clutches 23, 29 are engaged, the base 36 is moved at a low velocity in the direction of the arrow (a), and it is stopped when both of the clutches 23, 29 are disengaged. Accordingly, the weight of the movable part is reduced, the part can be brought into forward and reverse rectilinear motions by only one motor, and sufficient reliability can be obtained in the high-speed action or the like.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a printer driving device.

Conventional configurations and their problems In general, various methods have been proposed for printer drive devices to make printing faster, smaller, and cheaper. This is a book that is inversely proportional to that, and the configuration of the drive unit is extremely important in this respect. Recently, many stepping motors and servo motors have been used as drive sources, and the mainstream is to operate the movable parts by using wires, belts, etc. to rotate the motor, and price competition is fierce. A low-cost and highly reliable drive structure is desired.

A conventional printer driving device will be described below. Figure 1 is a plan view of a wire-type printer drive device.
(1) is a stepping motor for spacing, (2)
) is a stepping motor for character selection, and (3) is a stepping motor for driving the platen.

A wire (6) is hung between a pulley (4) at one end and a pulley (5) at the other end connected to a stepping motor (1) for spacing, and both ends of the wire (6) are connected to a movable page. The movable pace (7) is supported by two large parallel shafts (9), and the character selection stepping motor ( 2), a petal-shaped type head (8), and a number of printing mechanism members (not shown) are placed thereon. Regarding the conventional wire-type printer drive device configured as described above,
The operation will be explained below. The forward and reverse rotation of the spacing stepping motor (1) causes the pulley (4) to rotate forward and backward, and its rotational motion is transferred to the movable pacer (
7) as a linear motion to perform left and right spacing. During the spacing, a character selection stepping motor (2) is rotated, and a petal-shaped type head (8) connected to this stepping motor (2) is rotated to perform character selection. Thereafter, a printing operation is performed by a printing mechanism member (not shown). Further, the platen αG is rotated by the platen driving stepping motor (3) to feed the paper. However, as shown in Figure 1, the conventional wire-type printer drive device described above uses at least three stepping motors, which increases the cost of the motor control section and the motor control section, making it difficult to reduce the price. It is extremely difficult to achieve this goal.

Furthermore, since the character selection stepping motor (2) and a large number of printing mechanism members (not shown) are placed on the movable pace (7), the weight applied to the movable pace (7) increases, causing The load on the pacing stepping motor (1) becomes heavy. Furthermore, since high speed is required, the spacing stepping motor (1) naturally has to be of a large torque type and has a large shape, resulting in a dramatic increase in the cost of the motor alone. In addition, the movable pace (7), which is a heavy object, is stationary during printing in order to improve printing quality, so it has to start and stop repeatedly as needed.As shown in Figure 1, a wire (6) is used as a power transmission member.
) or a belt, etc., there were drawbacks such as vibrations being likely to occur.

FIG. 2 is a plan view showing a ball screw type printer drive device. Here, (II) is a stepping motor for spacing, H is a stepping motor for character selection, and I is a stepping motor for driving a platen. It is connected to the pacing stepping motor (Ill). The ball screw nut (16) screwed into the ball screw (14) is fixed at a movable pace 0η, and the character selection stepping motor f121 and the like are mounted on the movable base 0η. A petal-shaped type head θ and a number of printing mechanism members (not shown) are mounted. (1 (support) is a movable pace A7
) is a platen driven by the stepping motor. To explain the operation of the ball screw type printer drive device configured as above, the spacing stepping motor (11) is rotated in forward and reverse directions, and the ball screw 04) is rotated in forward and reverse directions, thereby rotating the ball screw nut m. A fixed movable pace (lη performs spacing left and right, and other platen drives and character selection drives are similar to the wire type shown in Figure 1. Such a ball screw type printer drive - The device has less vibration and higher reliability than the wire-type printer drive device shown in Figure 1, but it is costly because ball screws (I4) and ball screws (I4) are much more expensive than wires. It had disadvantages in terms of.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a printer drive device that can be constructed at a low cost and has sufficient reliability.

Structure of the Invention In order to achieve the above object, the printer drive device of the present invention includes a drive motor, a first clutch that selectively transmits the rotation of the drive motor, and a drive motor that transmits the rotation of the drive motor via the first clutch. A screw shaft rotated by a motor, a rotary shaft parallel to the screw shaft and rotated by the drive motor via a first power transmission member, and a rotary shaft that rotates on the rotary shaft and slides in the axial direction. a transmission member; a nut portion that rotates on the screw shaft in the same direction as the screw shaft due to rotation of the rotation transmission member; and a second clutch that selectively transmits rotation of the drive motor to the nut portion. This is the book I composed.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be explained with reference to the drawings (Figs. 3 to 6).
The explanation will be based on Figure). In Fig. 3, which is a plan view of the printer drive device, 1) is a square coil type motor, and a gear is attached to shaft 7) (211L) of this motor 1).
□ is fixed, and screws 3-7 are attached via the spring clutch part.

The gear as a power transmission member! Gear 2z is always in mesh with gear 4, and gear 4 is fixed to rotating shaft (A). Also, as rotation transmission members, a gear and a screw shaft (
The gears (c) rotating on 24 are always in mesh. The spring clutch part selectively transmits the rotation of the gear to the nut part. Also, the pulley C11l integrated with the gear (C) rotates a petal-shaped type head (not shown) via a rubber belt (not shown), and rotates in synchronization with the square coil type motor (21). do.

Slit plates 1321 and (G) are provided on the screw 7 and the nut H, respectively, and the rotation speed is detected by the sensor. fie21D is rotatably attached to a movable base (to), and the movable pace is supported by a screw shirt (f24) and a rotating shaft H. Further, the spring clutch portion t2
B) 4 has the same structure, and the structure will be explained using a sectional view of the spring clutch component shown in FIG.弼 is a clutch spring that spirally wraps around the ends of the gear (22) and the slit plate (to), and inserts one end into the groove (3B&) of the sleeve ■ as shown in Figure 5, and the other end. Screw shaft (
Fix it to 24I and hook it into the groove of the slit plate ■. Clutch spring attached to gear hard and slit plate color (
9) The inner diameter of the sleeve droplet is slightly larger than the outer diameter of the clutch spring. bulges, causing the gear (b) and clutch spring (9) to slip. Also, by the action of the electromagnet 141), when the trigger plate (4) comes off the sleeve (2), the clutch spring (1) bites into the gear, and the rotation of the gear is transmitted to the slit plate (a), that is, the screw (7).

In the former case, the spring clutch section is turned off, and in the latter case, it is turned on. The operation of the printer drive device of this embodiment configured as above will be described below. <When the Maya coil type motor (21) is rotated, the gear f2Z t251 (2η (c)) and the rotating shaft f2f10 rotate regardless of whether the spring clutch part El (29) is on or off. Also, each rotation The rotation direction of the member is only one direction, and (assuming the rotation direction of the square coil motor (21) is the forward direction, the rotation direction of the coil type motor (21) is the forward direction. Nut part
is forward rotation, gear me27), rotating shaft (2 (
) is a rotation in the opposite direction. Now, if the screw shaft round is a right-handed thread and only the spring clutch part (to) is in the above-mentioned on state, the movable base ■ will move in the direction of the arrow in Fig. 3, and only the spring clutch part (c) will move. When in the on state, it moves in the direction of the arrow in Figure 3. When the spring clutch is in the OFF state, the movable base is stationary. In addition, a square coil type motor (2
1) In other words, the gear (281) is decelerated with respect to the rotation of the gear (281), and the spring clutch is (When the screw shaft is in the ON state, the night part (30) rotates and slides at a relative speed of half a rotation for one revolution of the screw shaft, and the movable base part (30) rotates and slides at a relative speed of half a rotation.
move in the direction. The four basic movements of the above-mentioned movable base are shown in the table below.

According to the table, the movable base ■ performs four basic movements by operating □□□. Conditions M and C have opposite movement directions but the same movement speed, and condition B has the same movement speed. It moves in the same direction as A and has twice the movement speed, and is used when returning the movable base (to), and the condition means a stationary state. The amount of movement of the movable base (■) is determined by detecting the rotation of the slit plate (■) fixed to the screw shaft (24) and the rotation of the slit plate (■) fixed to the nut (3t1) with sensors C141C151, respectively, and the movement of the electromagnet (41). The spring clutch part TW is turned on and off by turning on and off. 29). Further, a petal-shaped type head (not shown) rotated by the rotation of the pulley C11l can select characters by controlling start and stop using a spring clutch part (not shown). .

As described above, according to this embodiment, the weight on the movable pace, which is the movable part, is reduced, and one square coil-shaped motor body υ is used for spacing and driving the rotation of the petal-shaped type head. Since the structure is based on a source, the cost is significantly reduced compared to the conventional example shown in FIGS. 1 and 2, and it is possible to increase the speed and has sufficient reliability.

Effects of the Invention As described above, according to the present invention, the weight of the movable part is reduced and one inexpensive motor that rotates in only one direction is used as a drive source, and each rotation is transmitted through a clutch that selectively transmits the rotation of the motor. It has a structure that transmits power to the driven part and obtains forward and reverse linear motion, etc., and the cost of the motor and motor rotation control part is extremely low, reducing the cost of the entire drive part. This makes it possible to realize an excellent printer drive device that does not have sufficient reliability in terms of operation, etc.

[Brief explanation of the drawing]

1 and 2 are plan views showing different conventional printer driving devices, and FIGS. 3 to 6 show an embodiment of the present invention, and FIG. 3 is a plan view of the printer driving device. FIG. 4 is a sectional view of the spring clutch section, FIG. 5 is a perspective view of the sleeve, and FIG. 6 is a side view of the spring clutch section. (21)...Kumadori coil type motor, wire...gear,
(Se...spring clutch part, example...screw shaft, (20...gear, (b)...rotating shaft, cutting 71□□□...gear, (c)...spring clutch Part, (30)...Nut part, 61:...Pulley, C button...Slit plate, (341(G)...Sensor, Makoto...Movable pace, C)...Clutch spring ,■...sleeve, field...spring, (4 points...trigger plate, 4 points...electromagnet agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Claims] L: a drive motor, a first clutch that selectively transmits rotation of the drive motor, and a screw shaft rotated by the drive motor via the first clutch;
a rotating shaft parallel to the screw shaft and rotated by the drive motor via a first power transmission member;
a rotation transmission member that rotates on the rotation shaft and slides in the axial direction; a nut portion that rotates on the screw shaft in the same direction as the screw shaft due to rotation of the rotation transmission member; and a nut portion that rotates on the screw shaft in the same direction as the screw shaft. and a second clutch that selectively transmits rotation of the nut to the nut.