JP5055785B2 - Dot line printer shuttle mechanism - Google Patents

Description

  The present invention relates to a dot line printer that performs printing in a dot matrix format using a dot printing hammer, and more particularly to a shuttle mechanism for reciprocating a dot printing hammer in the digit direction.

  An outline of the printing mechanism of the dot line printer will be described with reference to FIG.

  A hammer bank 11 carrying a plurality of printing hammers (not shown) is connected to the hammer block 1 and supported by a shaft 5 via a slide bearing. A counter balancer 3 that operates in the opposite phase to the hammer bank 11 is also supported by the shaft 5 via a linear bearing. There are various methods for driving the hammer bank 11 and the counter balancer 3. Here, a crank method using the crank 6 will be described as an example.

  The pair of cranks 6 has one end connected to the hammer block 1 and the other end connected to the counter balancer 3, and each connected to the drive shaft of the motor 7. Since the two cranks 6 are arranged with a phase difference of 180 °, when the motor 7 is driven, the hammer bank 11 and the counter balancer 3 reciprocate in opposite phases. A sensor (not shown) is attached to the hammer bank 11, and when the hammer bank 11 moves, a signal is output at regular intervals to drive the print hammer via a print control circuit (not shown), and the ink ribbon 12 The dot printing is performed at a predetermined position on the paper 13 via the. The paper 13 is conveyed by a tractor 18 driven by a paper feed motor 17 at an appropriate time when the hammer bank 11 is reversed.

  Next, with reference to FIG. 5, the method in the prior art will be described using FIG. 6 and FIG.

  When the hammer bank 11 strikes the paper 13, the entire hammer bank 11 receives the reaction force of the striking force. The hammer bank 11 is attached to the shaft 5 via the hammer block 1 and rotates around the shaft 5 due to the reaction force, and thus has a function of preventing rotation. As a function of the rotation stop, it is necessary to make it movable in the sliding direction of the shaft 5 and to fix the rotation direction. For this reason, it is generally fixed by a bearing 16 that can rotate the outer ring. As shown in FIG. 6, the shift plate 2 is fixed to the hammer block 1 fixed via the shaft 5 as shown in FIG. 6, and the upper and lower sides of the shift plate 2 are held between the bearings 16. On the other hand, the shaft 5 does not rotate. The hammer bank 11 is supported by the shaft 5 at two points of the left and right hammer blocks 1 in the hammer driving direction by the shuttle, and a shift plate 2 is attached to each hammer block 1 and is sandwiched between a pair of bearings 16 and is placed in the hammer bank 11. The rotation is stopped.

  However, the support by the rotation stop at two points of the left and right hammer blocks 1 is a configuration in which the bearing 16 is pressed vertically against the shift plate 2 mounted horizontally, and a holder 17 for holding and aligning the bearing 16 is provided. (For example, refer to Patent Documents 1 and 2.) In addition, since the mounting angle of the bearing 16 needs to ensure a high degree of parallelism with respect to the shift plate 2, it is necessary to ensure a high degree of accuracy of the angular degree in the holder 17, and the cost is high. Further, when the shaft portion 16a of the bearing 16 is fastened and fixed to the holder 17 with the screw 16b, the shaft portion 16a is rotated by the tightening torque at the time of fastening, so that it is not shown in order to hold the shaft portion 16a. It is necessary to form a flat part and tighten a screw using a spanner tool. In particular, when the lower bearing 16 of the shift plate 2 is fixed, the operation is difficult and the adjustment cost is high ( For example, see Patent Document 3.)

JP 2002-52746 A

JP 2005-59288 A

JP 2003-25673 A

  As described above, the holder 17 having a high positional accuracy is required for holding and aligning the bearing 16, and the screw 16 is screwed using a dedicated tool when the shaft portion 16a of the bearing 16 is fastened. It is necessary to perform tightening, and in particular, when fixing the lower bearing 16 of the shift plate 2, the operation is difficult and the adjustment cost is high, and the configuration that makes it easy to adjust the position of the shift plate 2 at low cost. Realization is a challenge.

The above problem is a dot line printer in which a hammer bank equipped with a plurality of printing elements is moved back and forth using a shuttle mechanism, and dot matrix printing is performed in this process.
A shaft which is fixed to respective opposite ends of said hammer bank, a shift holder connected to each of the shaft, the shift plates respectively vertically secured to the shift holder, and two pairs of bearings sandwiching the shift plate, a crank coupled while shifting the holder, the other to counter balancer is fixed to the base plate, and a motor coupled to the front Symbol crank, the two pairs of bearings are fixed directly before SL baseplate In addition, a fixing auxiliary member is provided between the bearing and the base plate .

  According to the present invention, by making the mounting direction of the shift plate and the bearing vertical, it is possible to remove a dedicated holder that has been necessary in the past and to move and stop the rotation of the bearing at a place where workability is poor. Therefore, it is possible to provide a low-cost and highly reliable dot line printer.

  Hereinafter, an example of the present invention will be described with reference to FIGS. 1, 2, and 3.

  1 and 2 show the overall configuration of the shuttle mechanism of the present invention.

  Both ends of the hammer bank 11 are fixed to the shaft 5, and the shift plate 2 is fixed to the shift holder 20 connected to the shaft 5 vertically at two places in the digit direction. By holding each shift plate 2 between a pair of bearings 16 facing each other, rotation of the hammer bank 11 due to a printing reaction force is prevented. The bearing 16 is directly fixed to the base plate 19 that fixes the motor 7, and the screw that fixes the bearing 16 is accessed from below the opening of the mechanical frame 30 that fixes the base plate 19. One of the cranks 6 connected to the motor 7 is connected to the shift holder 20 and the other is connected to the counter balancer 3.

  FIG. 3 is a top view of the base plate constituting the shuttle mechanism of the present invention, and FIG. 4 is a cross-sectional view taken along the line AB of FIG. The shift plates 2 at the two ends are sandwiched between a pair of bearings 16 facing each other, and the shaft portion 16a of the bearing 16 is connected to the elongated hole 21a of the fixing auxiliary member 21 made of sheet metal or the like. Both ends are formed flat. By moving the fixing auxiliary member 21 in the front-rear direction (the arrow direction in FIG. 3), the end face of the elongated hole of the fixing auxiliary member 21 pushes the shaft portion 16a, so that the bearing 16 can be moved. For example, when the bearing 16 is behind the shift plate 2, the bearing 16 can be moved to abut against the shift plate 2 by pulling the fixing auxiliary member 21 forward, and the bearing 16 is pressed with an appropriate load. Can be easily fixed with screws. When a general ball bearing is used as the bearing 16, a pressing load of about 19.6 N is appropriate.

  Furthermore, by making the shaft portion 16a fit into the elongated hole of the auxiliary fixing member 21 so that the shaft portion 16a cannot rotate, a function of stopping rotation by tightening when the shaft portion 16a is fixed with the screw 16b can be obtained.

  Further, after the fixing of the bearing 16 is completed by the fixing auxiliary member 21, the fixing auxiliary member 21 may be fixed by the fixing screw 22 so that the fixing auxiliary member 21 does not move due to vibration or the like during the shuttle operation.

It is the whole shuttle mechanism perspective view which showed an example of the present invention. It is the expanded view of the shuttle mechanism which showed an example of this invention. It is the top view which omitted a part of shuttle mechanism which showed an example of the present invention. FIG. 4 is an enlarged cross-sectional view taken along the line AB of FIG. It is the perspective view which showed the whole structure of the conventional dot line printer. It is the perspective view which showed the whole structure of the conventional shuttle mechanism. It is the side view which showed the slide guide part of the conventional shuttle mechanism.

Explanation of symbols

1 is a hammer block, 2 is a shift plate, 3 is a counter balancer, 5 is a shaft, 6 is a crank, 7 is a motor, 11 is a hammer bank, 12 is a ribbon, 13 is paper, 16 is a bearing, 16a is a shaft, 16b Is a screw, 17 is a holder, 18 is a tractor, 19 is a base plate, 20 is a shift holder, 21 is a fixing auxiliary member, 21a is a long hole, 22 is a fixing screw, and 30 is a mechanical frame.

Claims (3)

In a dot line printer that reciprocates a hammer bank equipped with multiple printing elements using a shuttle mechanism and performs dot matrix format printing in this process,
A shaft which is fixed to respective opposite ends of said hammer bank, a shift holder connected to each of the shaft, the shift plates respectively vertically secured to the shift holder, and two pairs of bearings sandwiching the shift plate, a crank coupled while shifting the holder, the other to counter balancer is fixed to the base plate, and a motor coupled to the front Symbol crank, the two pairs of bearings are fixed directly before SL baseplate In addition, a shuttle mechanism for a dot line printer , wherein a fixing auxiliary member is provided between the bearing and the base plate . The first auxiliary hole is provided in the fixing auxiliary member, and the shaft portion of the bearing is fitted into the first elongated hole, so that the bearing is movable. 2. A shuttle mechanism for a dot line printer according to 1. Further prior Symbol fixation assisting member is provided with a second elongated hole, the shuttle mechanism of the dot line printer of claim 2, wherein the fixing screw, characterized in that fixed to the second elongate hole.

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