JPH0577445A - Printing mechanism part - Google Patents

Abstract

PURPOSE:To prevent the transmission of vibrations generated by reciprocating motion to the outside by setting off said vibrations and to reduce a wt. and a size by reciprocally moving both upper and lower hammer banks in left and right directions in mutually opposite phases by two shuttle cams. CONSTITUTION:In a printing mechanism part, both upper and lower hammer banks 1a, 1b are reciprocally moved in left and right directions in mutually opposite phases by the shuttle cams 2, 3 respectively arranged to one end parts of said banks. By this constitution, the vibrations generated by reciprocating motion are set off to be prevented from the transmission to the outside. The wt. and size of the printing mechanism part is made half those of the hammer banks. In this case, both upper and lower hammer banks 1a, 1b are constituted so as to have the same structure and both left and right end parts thereof are supported by bearings 5a, 5b; 6a, 6b. The respective shuttle cams 2, 3 are supported by a support part 4 so that the phases thereof are shifted by 180 deg. and driven by one motor not shown in a drawing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing mechanism section of a dot impact line printer.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing an example of a printing mechanism section of a conventional dot impact line printer.

As shown in FIG. 3, the printing mechanism portion of a conventional dot impact line printer is integrated by vertically arranging two hammer spring rows in which a large number of hammer springs for printing operation are arranged side by side. A hammer bank 11, a shuttle cam 12 that drives the reciprocating motion of the hammer bank 11 in the left-right direction, a balancer 15 that has substantially the same weight as the hammer bank 11 and is provided below the hammer bank 11, and the balancer 15 as the hammer bank 11. A shuttle cam 13 that reciprocates in the left and right directions in opposite phases is provided, and the shuttle cam 12 and the shuttle cam 13 are held by a support portion 14 and driven by one motor (not shown) to move the hammer bank 11. The vibration of the balancer 15 is absorbed by the movement of the balancer 15 and is not transmitted to the outside.

[0004]

As described above, the printing mechanism portion of the conventional dot impact line printer is almost the same as the hammer bank in order to absorb the vibration due to the reciprocating motion of the hammer bank and not transmit it to the outside. Since the balancer having the same weight is provided and the balancer reciprocates in a phase opposite to that of the hammer bank, the weight of the printing mechanism portion is more than twice the weight of the hammer bank, and the printing mechanism portion is housed in the printer. There is a drawback that the volume also requires more than twice the size of the hammerbank.

[0005]

The printing mechanism section of the present invention comprises:
A permanent magnet, a lower yoke mounted below the permanent magnet, an upper yoke mounted above the permanent magnet, a plurality of coils wound around the upper yoke at equal intervals in the lateral direction, and fixed to the lower yoke corresponding to the coil. Upper hammer bank having a plurality of hammer springs provided so as to be slidable in the left and right direction, and the upper and lower hammer banks having the same structure as the upper hammer bank and inverted in the up and down direction to be disposed below the upper hammer bank. A lower hammerbank slidably held in one direction, two shuttle cams provided corresponding to the upper hammerbank and the lower hammerbank, respectively, and having the same shape and a phase shift of 180 degrees, It has one motor that rotates two shuttle cams at the same time.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a plan view showing a shuttle cam of the embodiment shown in FIG.

In FIG. 1, the upper hammer bank 1a is
A permanent magnet and a lower yoke mounted below this permanent magnet, an upper yoke mounted above the permanent magnet, a plurality of coils wound around the upper yoke at equal intervals in the lateral direction, and fixed to the lower yoke corresponding to these coils. Bearings 5a and 5b provided at both left and right end portions.
It is held by and can reciprocate left and right. The lower hammer bank 1b has the same structure as the upper hammer bank 1a and is arranged upside down under the upper hammer bank 1a, and like the upper hammer bank 1a,
It is held by bearings 6a and 6b provided at both left and right ends and can reciprocate in the left and right directions. The movement of the upper hammer bank 1a is driven by a shuttle cam 2 provided at the right end of the upper hammer bank 1a. The movement of the lower hammerbank 1b is driven by the shuttle cam 3 provided at the right end of the lower hammerbank 1b.

The shuttle cams 2 and 3 have the same outer shape as shown in FIG.
It is held at the support portion 4 with a shift of 80 degrees, and is driven by one motor (not shown).

In the printing mechanism section configured as described above, the upper hammer bank 1a and the lower hammer bank 1b reciprocate in the left and right directions in mutually opposite phases, so that the vibrations generated by these movements are offset. It does not transmit to the outside.
Moreover, since a balancer is not required unlike the conventional printing mechanism unit, its weight and size are almost halved.

[0011]

As described above, the printing mechanism section of the dot impact line printer of the present invention is configured to reciprocate the upper hammer bank and the lower hammer bank in the left and right directions in mutually opposite phases. As a result, it is possible to cancel the vibrations generated by those movements and prevent the vibrations from being transmitted to the outside, and moreover, it is possible to reduce the weight and the size by half.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing the shuttle cam of the embodiment shown in FIG.

FIG. 3 is a front view showing an example of a printing mechanism section of a conventional dot impact line printer.

[Explanation of symbols]

 1a Upper hammerbank 1b Lower hammerbank 2 Shuttle cam 3 Shuttle cam 4 Support part 5a Bearing 5b Bearing 6a Bearing 6b Bearing 11 Hammerbank 12 Shuttle cam 13 Shuttle cam 14 Support part 15 Balancer

Claims (2)

[Claims] 1. A permanent magnet, a lower yoke attached below the permanent magnet, an upper yoke attached above the permanent magnet, a plurality of coils wound around the upper yoke at equal intervals in the lateral direction, and the coil. An upper hammer bank having a plurality of hammer springs fixedly provided on the lower yoke and held slidably in the left and right direction, and an upper and lower hammer bank having the same structure as the upper hammer bank and inverted in the up and down direction to be located below the upper hammer bank. A lower hammerbank that is disposed and held slidably in the left-right direction, and two lower hammerbanks that are provided corresponding to the upper hammerbank and the lower hammerbank and have the same shape and a phase shift of 180 degrees. A printing mechanism section including a shuttle cam. 2. A permanent magnet, a lower yoke mounted below the permanent magnet, an upper yoke mounted above the permanent magnet, a plurality of coils wound around the upper yoke at equal intervals in the lateral direction, and the coil. An upper hammer bank having a plurality of hammer springs fixedly provided on the lower yoke and held slidably in the left and right direction, and an upper and lower hammer bank having the same structure as the upper hammer bank and inverted in the up and down direction to be located below the upper hammer bank. A lower hammerbank that is disposed and held slidably in the left-right direction, and two lower hammerbanks that are provided corresponding to the upper hammerbank and the lower hammerbank and have the same shape and a phase shift of 180 degrees. A printing mechanism section comprising a shuttle cam and one motor for simultaneously rotating the two shuttle cams.