JPH0751331Y2 - Carrier shaft support device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a carrier shaft support device used in an impact type dot printer.

Conventional Technology First, a conventional example is shown in FIG. A platen 2 is rotatably mounted on the side plates 1 facing each other. Further, there are provided a carrier shaft 5 and a carrier guide 21 for slidably guiding a carrier 20 in which an impact type dot printer head 3 is mounted. The carrier guide 21 is fixed to the side plate 1, and both ends of the carrier shaft 5 are fitted in the synthetic resin bushes 22 without play, and these bushes 22 have play in the holes 23 formed in the side plate 1. Not fitted. A roller 24 supported by a carrier guide 21 is rotatably attached to the carrier 20. Further, the pulleys 15 and 16 arranged on both sides of the side plate 1
A part of the timing belt 14 wound around is fixed to the carrier 20.

Therefore, the timing belt 14 is rotated by driving the pulley 15 with the motor 17, and the carrier 20 is moved along the platen 2.

Further, as shown in FIG. 4, both ends of the carrier shaft 5 are fitted into holes 25 formed in the side plate 1, and a washer 26 larger than the hole 25 is brought into contact with the outer end of the carrier shaft 5 so as to contact these washers. There is a conventional example in which screws 27 passed through 26 are screwed to both ends of the carrier shaft 5.

The problems shown in FIGS. 3 and 4 are printed by driving the dot printer head 3 in the process of moving the carrier 20, but the wire of the dot printer head 3 is continuous to the platen 2. , The dot printer head 3 vibrates during printing. This vibration is transmitted from the carrier 20 to the side plate 1 via the carrier shaft 5, the bush 22, the washer 27, and the like. The side plate 1 is made of a plate material and is a carrier.
Since the rigidity is insufficient compared to 20 and carrier shaft 5,
Generates a lot of noise.

For this reason, as disclosed in, for example, Japanese Patent Application Laid-Open No. 62-85974, there is one in which a carrier shaft is attached via a vibration isolator. Thereby, the vibration of the carrier shaft is absorbed by the vibration isolator. However, in order to attach the anti-vibration material to the side plate, there is a flange to prevent it from falling off,
There is a problem that it is extremely difficult to install. Further, since the hardness of the antivibration agent is constant, the vibration absorption cannot be adjusted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a carrier shaft supporting device that can be easily mounted and assembled and that can significantly reduce noise generation.

Means for Solving Problems A carrier shaft equipped with an impact type dot printer head for slidably holding a carrier, and a hole having a diameter larger than the outer diameter of the carrier shaft, the length of the carrier shaft. Is formed in a tubular shape having a diameter smaller than that of the flange and the hole that have side plates facing each other with an interval substantially equal to each other, and have a fitting portion into which both ends of the carrier shaft are fitted and which come into contact with the inner surface of the side plate. Anti-vibration members formed of elastically deformable portions inserted into the holes, abutting portions that abut the outer ends of the elastically deformable portions of these anti-vibration members, and the elastically deformable portions via the abutting portions. And a pressing member formed by a screw screwed into the carrier shaft so as to compress and deform.

Since the elastically deformable portion of the vibration isolator has a smaller diameter than the hole in the side plate, it is extremely easy to attach the vibration isolator to the side plate because it is only necessary to insert it.
Since the degree of deformation of the elastically deformable portion can be changed by the pressing means, the substantially elastic state of the vibration isolating member can be adjusted, and the state in which the noise is minimal can be obtained.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those described in FIGS. 3 and 4 will be described using the same reference numerals. A platen 2 is rotatably held by the side plates 1 facing each other, and a carrier 4 having a dot printer head 3 mounted thereon has two carrier shafts 5,
6 is slidably fitted. The outer peripheries of both ends of the carrier shafts 5, 6 are fitted to a vibration damping member 7 such as rubber. The pressing means 9 for pressing the outer ends of the vibration isolating members 7 penetrates through the vibration isolating member 7 and is screwed into the carrier shafts 5, 6, and the heads of these screws 10. A washer that is an abutting portion held between the end of the vibration isolating member 7 and the vibration isolating member 7.
11 and more. As shown in FIG. 2, the diameter D of the hole 8 formed in the side plate 1 is set to be slightly larger than the diameter d of the vibration isolator 7, but the vibration isolator 7 is pressed by the washer 11. Since the outer diameter increases by the amount compressed in the axial direction,
The movement of the vibration isolator 7 in the hole 8 is restricted. Also,
A collar 12 that contacts the inner surface of the side plate 1 and a fitting portion 13 that holds the carrier shafts 5, 6 are formed on the vibration-proof members 7. The depth of the fitting portion 13 substantially matches the width of the collar 12.
Further, a part of the timing belt 14 wound around the pulleys 15 and 16 arranged on the outside of the side plate 1 is fixed to the carrier 4, and the left pulley 15 is directly connected to a forward / reverse rotatable motor 17. .

In such a configuration, by supplying power to the motor 17 and driving the pulley 15, the timing belt 14 rotates and the carrier 4 moves along the platen 2. Printing is performed by driving the dot printer head 3 in this process. At this time, the vibration of the dot printer head 3 is transmitted from the carrier 4 to the carrier shafts 5 and 6, but this vibration is absorbed by the vibration isolating member 7 and is difficult to be transmitted to the side plate 1. As a result, even if the side plate 1 is insufficient in rigidity as compared with the carrier 4 and the carrier shafts 5,6, the carrier shafts 5,6
Since less vibration is transmitted from, noise generation is greatly suppressed. Further, since the vibration-proof member 7 has a diameter d smaller than the diameter D of the hole 8 of the side plate 1, it can be easily inserted into the hole 8.
Thereby, the vibration damping member 7 can be increased in hardness to prevent vibration. Furthermore, since the vibration-proof member 7 can change the hardness by changing the tightening force of the screw 10,
The resonance frequency can be selected.

Further, since the screw 10 is in contact with the carrier shafts 5, 6, by connecting the screw 10 and the side plate 1 with an electric wire,
Static electricity generated in the printing head 3 and the carrier 4 can be released to the side plate 1 from the carrier shafts 5, 6 through the screw 10 and the electric wire.

Further, since both ends of the carrier shafts 5, 6 are located inside the holes 8 of the side plate 1, the position of the shaft center does not change even when the vibration-proof member 7 bends, which allows the carrier shafts 5, 6 to be supported.
It is possible to keep the position of the shaft center of (1) constant and prevent gear shift between the platen 2 and the dot printer head 3 from occurring.

Effect of the Invention As described above, the present invention has a carrier shaft slidably holding a carrier equipped with an impact type dot printer head and a hole having a diameter larger than the outer diameter of the carrier shaft. A side plate facing each other with a gap substantially equal to the length of the carrier shaft, and a flange having a fitting portion into which both ends of the carrier shaft are fitted, and a flange having a diameter smaller than that of the flange and the hole contacting the inner surface of the side plate. A vibration damping member formed of an elastically deformable portion inserted into the hole, an abutting portion that abuts an outer end of the elastically deformable portion of the vibration isolating member, and the abutting portion through the abutting portion. Since the elastically deformable portion of the vibration isolating member has a smaller diameter than the hole of the side plate, since the elastically deformable portion is constituted by a pressing means formed with a screw screwed into the carrier shaft to compressively deform the elastically deformable portion, Attach the anti-vibration member to the side plate. When attaching, it is extremely easy because it can be simply inserted, and since the degree of deformation of the elastically deformable portion can be changed by the pressing means, it is possible to adjust the substantial elastic state of the vibration isolator. It is possible to obtain a state in which noise is minimally generated, and so on.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a plan view with a part in section, and FIG. 2 is a sectional view showing the relationship between a vibration isolator and holes in a side plate. FIGS. 3 and 4 show a conventional example and are partially plan views in section. 1 ... Side plate, 3 ... Dot printer head, 4 ... Carrier, 5,6 ... Carrier shaft, 7 ... Anti-vibration member, 8
...... Hole, 9 ...... Pressing means, 11 ...... Abutting part

Front page continuation (72) Inventor Chizora Kosaka 570, Ohito, Ohito-cho, Takata-gun, Shizuoka Tokyo Electric Co., Ltd. Ohito factory (56) References JP 62-85974 (JP, A) 138285 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A carrier shaft on which an impact type dot printer head is mounted so as to slidably hold a carrier, and a hole having a diameter larger than the outer diameter of the carrier shaft and having a length substantially equal to that of the carrier shaft. A side plate facing each other with a gap, and a collar that has a fitting portion into which both ends of the carrier shaft are fitted, and a collar that comes into contact with the inner surface of the side plate, and is formed in a tubular shape having a smaller diameter than the hole, and in the hole. A vibration damping member including an elastically deforming portion to be inserted, an abutting portion that abuts an outer end portion of the elastically deforming portion of these vibration damping members, and the elastically deforming portion is compressed and deformed via the abutting portion. A carrier shaft supporting device, comprising: a pressing unit formed by a screw screwed into the carrier shaft so that the carrier shaft supports the carrier shaft.