JPH055010Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The invention moves a hammer bank holding a plurality of printing hammers arranged in line along the printing line, and reciprocates along the printing line, and the process of this reciprocating movement. This application relates to a shuttle drive device for reciprocating a hammer bank used in shuttle printers that print with
This is an improvement over No. 162867.

[Background of the idea]

The shuttle drive device will be explained with reference to FIGS. 4 to 6. Two cam followers 3 and 4 that contact the outer circumferences of both radial sides of an eccentric cam 2 driven by a motor (not shown) are attached to the shift plate 1 via respective support shafts 5 and 6. The shift plate 1 is attached via screws 11 to a shift shaft 8 which is movably supported by a frame (not shown) via a slide bearing 10. The shift shaft 8 is provided with the hammer bank 9.
is installed. When the eccentric cam 2 is rotated, the shift plate 1, that is, the shift shaft 8, moves back and forth, and the hammer bank 9 moves back and forth, thereby performing a printing operation.

In such a configuration, the positional relationship between the eccentric cam 2 and the cam followers 3 and 4 is determined to reduce noise and the eccentric cam 2,
It must be set to an optimal value from the viewpoint of improving the durability of the cam followers 3 and 4.

When the distance between the cam followers 3 and 4 is small relative to the outer shape of the eccentric cam 2, the distance between the eccentric cam 2 and the cam follower 3,
The contact pressure of the cam 4 increases, causing problems such as an increase in frictional load, wear on the two surfaces of the eccentric cam, and damage to the cam followers 3 and 4, leading to a decrease in reliability.

Furthermore, if the distance between the cam followers 3 and 4 is large relative to the outer shape of the eccentric cam 2, a gap will occur between the eccentric cam 2 and the cam followers 3 and 4, resulting in a decrease in printing quality due to a decrease in the positional accuracy of the hammer bank 9, and a decrease in the eccentricity. cam 2
The noise caused by the impact noise of the cam followers 3 and 4 increases.

For this reason, an eccentric support shaft 6 as shown in FIG. 6 is used as the support shaft of the cam follower 4, and by rotating the eccentric support shaft 6, the distance between the two cam followers 3 and 4 is adjusted to an appropriate value. .

However, with this adjustment method, the external dimensions of the eccentric cam 2 vary due to manufacturing, so it is necessary to measure the external dimensions of the eccentric cam 2 in advance and adjust the spacing between the cam followers 3 and 4 according to the measured dimensions. There is a problem that operation is cumbersome. In addition, the eccentric support shaft 6 is attached to the shift plate 1 with a nut 7, but when tightening the nut 7, the eccentric support shaft 6
There is a problem in that the cam followers rotate and the cam follower spacing changes.

As described above, the conventional shuttle drive device has disadvantages in that it requires a lot of time for adjustment, reduces the assembly accuracy of the cam follower interval, and inevitably increases the price and degrades the performance of the shuttle printer.

[Purpose of invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to facilitate the adjustment of the cam follower interval, to enable highly accurate adjustment of the cam follower interval, and to achieve low cost and high reliability of the shuttle printer.

[Summary of the idea]

This invention allows the cam follower spacing to be adjusted after the eccentric cam and shift plate are installed.
It is characterized by being devised so that the cam follower spacing can be stably adjusted to the optimum distance without being limited by the external dimensions of the eccentric cam.

[Example of idea]

The present invention will be explained below with reference to the embodiment drawings of FIGS. 1 to 3. Cam follower 4 and its support shaft 12
An eccentric collar 13 is interposed between them. The center of the outer diameter and the center of the inner diameter of the eccentric collar 13 are eccentric. An integral arm 14 extends below the eccentric collar 13, and a long groove 15 is provided at the lower end of the arm 14.

To adjust the cam follower spacing, the arm 14 may be rotated while the eccentric cam 2, the cam followers 3, 4, and their support shafts 5, 12 are attached to the shift plate 1 with nuts 7 as shown. Arm 1
4, the cam follower interval is adjusted appropriately by the eccentric collar 13, and then the arm 14, that is, the eccentric collar 13 is fixed by tightening the screw 16.

[Effect of idea]

As explained above, according to the present invention, it is possible to adjust the cam follower spacing to the optimum cam follower spacing that matches the eccentric cam regardless of the external dimensional accuracy of the eccentric cam, and it is also possible to prevent changes in the cam follower spacing due to fixation after adjustment. It is possible to improve assembly efficiency and perform high-precision assembly, thereby reducing costs by reducing assembly man-hours and improving reliability by high-precision assembly.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the shuttle drive device of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is an example of the conventional device. 5 is a sectional view taken along the line in FIG. 4, and FIG. 6 is a side view showing an example of the eccentric support shaft used in FIG. 5. In the figure, 1 is a shift plate, 2 is an eccentric cam, 3, 4 are cam followers, 5, 6, 12 are support shafts, 7 is a nut, 8 is a shift shaft, 9 is a hammer bank, 10 is a slide bearing, 11, 1
6 is a screw, 13 is an eccentric collar, 14 is an arm, 1
5 is a long groove.

Claims (1)

[Claims for Utility Model Registration] An eccentric cam driven by a motor, at least two cam followers that contact the eccentric cam on both sides in the radial direction of the eccentric cam, a shift plate to which the cam followers are attached, and a shift plate to which the shift plate is attached. A shuttle drive device equipped with a shift shaft having a hammer bank attached to one end and reciprocating the hammer bank, the shuttle drive device having an arm between at least one of the two cam followers and its support shaft. A shuttle drive device characterized in that the arm is fixed at a predetermined position by interposing an eccentric collar.