JPH0193359A - Up-down moving apparatus of type wheel in printing apparatus - Google Patents

Abstract

PURPOSE:To simplify a drive apparatus, to reduce the wt. of a carrier and to increase a printing speed, by providing a gear part to the up-down body of a type wheel and providing a tooth omitted part to the drive gear meshing with said gear part. CONSTITUTION:A drive gear 3 is provided with the up-down body part 1c of a type wheel 2 and a gear part 1e having a shaft hole 1d as a core is provided to the other end part of the type wheel 2 and a projection if for preventing the meshing of the gear part 1e with the drive gear 3 at an unfit position is provided to one end part of the gear part 1e. The elastically supported type wheel up-down body 1 of the type wheel 2 has the shaft hole 1d and a part of the tooth part meshing with the gear part 1e provided to a type wheel receiving housing 6 is omitted as shown by D and, when the type wheel receiving housing 6 is moved along with a receiving stand 8 at the home position of the drive gear 3 by the driving of a drive motor 10 and when the type wheel receiving housing 6 is set to the receiving stand 8, the gear part 1e of the up- down faces 1 of the type wheel 2 is prevented from the contact with the drive gear 3.

Description

Detailed Description of the Invention A. Field of Industrial Application This invention relates to a plurality of type wheels housed in a type wheel accommodating case movably mounted on a carrier, each of which is provided on the upper and lower bodies of the type wheel. The present invention relates to upper and lower bodies of a type wheel in a printing position, in which a desired one is moved to a position suitable for printing and to a housing position of a type wheel housing case.

2. Description of the Related Art Conventionally, a plurality of type wheels are housed in a storage case movably mounted on a carrier, and a desired position of the type wheels provided on the upper and lower bodies of each type wheel is adapted for printing. In a printing device which is arranged to be located at the storage position of the storage case, when the upper and lower bodies of the type wheel are moved up and down, both ends of the upper and lower bodies of the type wheel are connected to a belt or a lever through engaging bodies. There has been no technical disclosure regarding a type wheel up-and-down device that moves the type wheel up and down via the upper and lower bodies of the type wheel by means of the vertical movement of the upper and lower bodies of the type wheel.

Problems to be Solved by the Invention The drive device for vertically moving the upper and lower bodies of the type wheel in the above-mentioned conventional printing device is complicated, which not only increases the production cost but also increases the weight and volume of the carrier. There is a problem in that this increases the number of pixels, which hinders the improvement of printing speed and miniaturization. The technical object of the present invention is to solve the problems of the conventional ones.

21 Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is provided with a gear portion at one end and a means for holding a type wheel at the other end, as well as a type wheel accommodating casing. The upper and lower bodies of the type wheel are suspended such that the upper and lower bodies of the type wheel are suspended, and a drive gear provided on a carrier as a drive means for the upper and lower bodies of the type wheel that meshes with the gear part, and the drive gear is provided with a drive gear. is provided with a toothless portion that temporarily releases the meshing with the gear portions of the upper and lower bodies of the type wheel at the home position.

The rotation of the drive gear causes the drive gear to mesh with the gear portions of the upper and lower bodies of the type wheel, thereby causing the upper and lower bodies of the type wheel to swing, thereby ensuring that the type wheels are positioned at their respective predetermined positions. At the home position of the driving gear, the toothless portion of the driving gear disengages the driving gear from the gear portions of the upper and lower bodies of the type wheel, and the type wheel housing in which the upper and lower bodies of the type wheel are housed is disengaged. It becomes possible to set and remove the casing from the cradle.

In Example 1, the upper and lower bodies of the type wheel are mainly attached to the boss portion 2a of the type wheel 2 at one end as shown in the first figure. a recessed portion la that engages from the front side); a protrusion 1b that protrudes upward (forward in the figure) approximately at the center of the recessed portion 1a;
A pair of holding shafts 7 each having an elastic engaging element B that is erected with a slight gap A left on both sides of the concave portion 1a.
The type wheel accommodating housing 6 accommodates the type wheel casing 6 in a swingable manner at a predetermined interval. Reference numeral 8 designates a pedestal for the type wheel housing 6; the pedestal 8 is provided on the carrier 4; a rack portion 9 provided on the pedestal 8 and a gear 10 of a drive motor 10 provided on the carrier 4; along the support shaft 11 provided on the carrier 4 in a direction perpendicular to the axial direction of the platen 12 which is rotatably mounted on a machine stand (not shown) (in FIG. 2). It is movable along with the type wheel housing 6 (left and right).

Further, as shown in the third figure, the type wheel housing 6 is temporarily moved to the position where it is moved to the pedestal 8 by the engagement between the opening engaging portion 6 formed at one end thereof and the shaft 7. It is suspended so that it can be stopped, and can be inserted into and removed from the pedestal 8 from the horizontal direction (rightward in the figure). Next, the drive gear 3 is rotated by the drive of a motor 13 as a drive means provided on the carrier 4. In addition to the upper and lower body parts 1c of the type wheel, this drive gear 3 is provided with a gear part 1e centered around the shaft hole 1d at the other end, and one end of the gear part 1e. A projecting portion if is provided to prevent the gear portion 1e from meshing with a drive gear 3 as a drive means, which will be described in detail later, at an inappropriate position.

In addition, approximately at the center of the upper and lower bodies 1 of the type wheel, there is a rotation of the upper and lower bodies 1 of the type wheel about the shaft hole 1d formed in a substantially arc shape, facing upward (forward in FIG. 1). A retaining surface 1g is provided which engages with a guide groove 5 provided in the carrier 4 during movement to prevent horizontal vibration of the upper and lower bodies 1 of the type wheel. Then, the projections 1b of the upper and lower bodies 1 of the type wheel 2 are engaged with the notches 2b bored in the lower side (the front side in the figure) of the boss portion 2a of the type wheel 2,
The boss portion 2a is engaged with the concave portion 1a of the upper and lower body 1 of the type wheel, and the engaging elements B of the pair of holding portions 1c are elastically engaged with the annular groove C of the boss portion 2a, so that the type wheel 2 is elastically supported. As shown in the second figure, the type wheel upper and lower body 1 has a shaft hole 1d partially toothed to mesh with a gear portion 1e provided in the type wheel housing 6, and is connected to a drive gear. 3, when the type wheel housing case 6 is moved together with the pedestal 8 by the driving of the drive motor 10,
When setting the type wheel, the gear portion 1e of the upper and lower body 1 of the type wheel does not come into contact with the drive gear 3. As shown in FIG. 4, the drive gear 3 rotates from the home position to mesh with the gear portions 1e of the upper and lower bodies 1 of the type wheel at an appropriate position, and together with the type wheel 2, the upper and lower parts of the type wheel are rotated. The body l is moved up and down by rocking. In FIG. 7, 14 is a wheel motor for selectively rotating the type wheel 2, 15 is a rotation shaft thereof, and 16 is a positioning protrusion integrally provided on the rotation shaft 15, which is connected to the type wheel 2. The rotary shaft 15 and the type wheel 2 are positioned and connected by engaging with a connecting hole 2C drilled in the rotary shaft 15.

FIG. 6 shows that when the drive gear 3 is not at the home position, when the type wheel storage case 6 is set on the pedestal 8, the protrusion 1f of the upper and lower bodies 1 of the type wheel
In order to prevent the drive gear 3 from meshing with the gear portion 1e of the upper and lower body l of the type wheel at an inappropriate position, the type wheel housing housing 6 is set on the pedestal 8. This shows the state in which it is no longer possible to do so.

In the constriction configuration, the upper and lower bodies l of a plurality of type wheels housed in a type wheel housing casing 6 mounted on the carrier 4 are elastically engaged via a pedestal 8 so as to be movable. As shown in the fourth figure, a desired one of the type wheels 2 held elastically is rotated by the drive gear 3, and the upper and lower bodies 1 of the type wheel are engaged with the gear portions 1e of the upper and lower bodies 1 of the type wheel. In the upward movement process of the swinging wheel, the type wheel 2 is positioned at a position suitable for printing, and in this state, the rotation shaft 15 of the wheel motor 14 is inserted into the engagement hole 2d of the type wheel 2.
At the same time, the positioning protrusion 16 provided on the rotation shaft 15 is engaged with the connection hole 2C to determine the position, and then the upper and lower bodies 1 of the type wheel are rotated in the opposite direction by the rotation of the drive gear 3. During the downward stroke of the swing, the engaging element B of the holding part IC of the upper and lower bodies 1 of the type wheel is moved against its elasticity,
Separated from the annular groove C of the boss portion 2a of the type wheel 2,
Only the upper and lower bodies 1 of the type wheel are accommodated in the type wheel housing 6. In this state, the type wheel 2 is selectively rotated by the wheel motor 14 to perform printing. (Figure 5 shows this state.) Next, when printing is finished,
Due to the rotation of the drive gear 3, the upper and lower bodies 1 of the type wheel swing towards the type wheel 2 during the starting stroke, and the retainer B of the holding portion IC is moved into the annular groove C of the boss portion 2a of the type wheel 2. When the rotary shaft 15 of the wheel motor 14 comes out of the engagement hole 1d of the type wheel 2 and the positioning protrusion 16 comes out of the connection hole 2c, the drive gear 3 moves to the opposite position of the home position. By the rotation in the direction, the upper and lower bodies 1 of the type wheel are accommodated in the type wheel accommodating casing 6 while elastically supporting the type wheel 2 due to the downward stroke of the swinging movement of the upper and lower bodies 1 of the type wheel. Then, the drive gear 3 is at its home position when the upper and lower bodies 1 of the type wheel
is disengaged from the gear portion 1e, and the type wheel accommodating case 6 together with the pedestal 8 can be moved to the position where the next desired type wheel 2 is selected. In the figure, 17 and 18 indicate a printing hammer and a ribbon cassette provided on the carrier 4, respectively, and 19 indicates a support shaft of the carrier 4, respectively.

3. Effects of the invention As mentioned above, by providing gear parts on the upper and lower bodies of the type wheel and providing a toothless part on the drive gear that meshes with the gear parts, it is possible to improve the effect of the invention compared to the conventional type wheel. , during the vertical movement process of the upper and lower bodies of the type wheel, only the rotation of the upper and lower bodies of the type wheel is performed, without driving both ends of the upper and lower bodies of the type wheel through engaging bodies with belts, levers, etc. In addition to simplifying the driving device compared to conventional gutter, this also reduces the weight of the carrier, increases printing speed, and reduces production. Not only can the cost be reduced, but also the home position of the drive gear is
The toothless portion of the drive gear not only does not impede the movement of the type wheel accommodating case together with the cradle and the setting of the type wheel accommodating casing to the pedestal, but also prevents the meshing of the drive gear and the gear portion. This rotation has extremely great effects, such as the ability to reliably move the type wheel up and down via the upper and lower bodies of the type wheel.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the enclosing part, and FIG. 7 is a partially cutaway perspective view. 1... Upper and lower bodies of type wheel 2... Type wheel 2a... Boss portion 1a of type wheel... Concave portion ib... Protrusion A... Gap B... Engagement element C... Annular groove IC...Holding part 1d...Shaft hole le...Gear part 3...Drive gear If...Protrusion 3...Drive motor 4...Carrier 5...Guide groove 1g ... Engagement surface 2f ... Notch 6 of boss portion 2a ... Type wheel housing casing 7 ... Shaft 8 ... Pedestal 9 ... Rack section 10 ... Drive motor 10 ... Gear 11...Support shaft 12...Platen 6...Opening engagement part 13...Motor D...Toothless 14...Wheel motor 15...Rotation shaft 16...Protrusion 2C ...Connection hole 2d...Engagement hole 17...Printing hammer 18...Ribbon cassette 19...Support shaft M1 diagram Heater 2 Figure 3 Figure 4 Figure 5 Figure / 1 '/'' r7
f C77L'' Fig. 6 Fig. 7

Claims (1)

[Claims] A plurality of type wheels are housed at predetermined intervals in a type wheel accommodating case that is movable on a carrier that is movable in parallel with the axial direction of a platen that is rotatably suspended on a machine base. In a printing device that prints by positioning a desired one of the type wheels provided on the upper and lower bodies at a position suitable for printing through the upper and lower bodies of the type wheel,
The upper and lower bodies of the type wheel are each provided with a gear portion and means for holding the type wheel, and a drive gear provided on the carrier serves as a drive means for the upper and lower bodies of the type wheel that meshes with the gear portion. In the printing device, the type wheel in the printing device is characterized in that the drive gear is provided with a toothless portion that temporarily releases the engagement with the gear portions of the upper and lower bodies of the type wheel at the home position position. Upper and lower device.