JPH07102720B2 - Home position detection mechanism - Google Patents

Description

The present invention relates to a home position detecting mechanism, and more particularly to a home position detecting mechanism for detecting a home position of a carrier having a printing mechanism section of a printing device.

[Conventional technology]

The conventional home position detection mechanism uses Hall ICs, photosensors, and micro switches as switches, and attaches magnets and levers that activate various switches to the operating carrier side, and the positional relationship between the switches and levers for each device. Was being adjusted.

For this reason, even if the positional relationship between the switch and the lever is changed due to the print density operation and the home position is displaced, an allowable range is set for management and production.

Next, a conventional home position detecting mechanism will be described with reference to the drawings.

FIG. 3 is a front view showing a conventional example, and FIG. 4 is a front view showing a switch of the conventional example shown in FIG. 3 and a corresponding portion of a kicker.

In the conventional home position detecting mechanism shown in FIG. 3, the left side frame 1, the guide shaft 2 and the carrier 3 are indicated by the dotted line parts which move to the switch operating point.
Indicates.

The dotted line with the switch 4 and the kicker 8 shows the same as the carrier 3, and the detent lever 11 is a light and shade operation lever.
The light side frame 12 is a frame structural component, and the hole is for positioning the detent lever 11. As shown in FIG. 4, the switch 4 and the kicker 8 change the position of the operating point due to the shading operation.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional home position detection mechanism described above, in order to put the variation of the detection position within a certain range, various switches fixed to the main body such as a mechanical base and various switches mounted on the carrier equipped with the printing mechanism are mounted. Since the adjustment of the position of the lever etc. to operate it was done and the ON-OFF operation of turning on the power several times was repeated to keep it within the standard range, the production efficiency was poor, and when the print density was operated, the switch and lever etc. Changes in
Therefore, there is a drawback that the home position is changed and the alignment of the first print is deteriorated.

[Means for Solving the Problems]

The home position detecting mechanism of the present invention is a mechanism part structure in which a carrier equipped with a printing mechanism is combined with a home position detecting microswitch and an operating lever of the microswitch, and the carrier is moved to the left or right when the built-in device power is turned on. The micro-switch operating lever hits the side frame, which activates the switch, and detects the home position.With this structure, the switch and operating lever are installed in the same location, so position alignment and operating point positioning adjustment are performed. The work is unnecessary, and the switch and the operating lever are interlocked with each other even when the print density is changed, so that the home position does not change. Therefore, the variation in the first print position is small, and the character alignment quality is improved each time the power is turned on. .

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

In the home position detection mechanism shown in FIG. 1, the left side frame 1 is a frame structural component of a mechanical unit, the guide shaft 2 is a shaft for guiding the carrier operation, the carrier 3 is equipped with a printing mechanism, and the switch 4 is for position detection. The kicker 5 is incorporated into the carrier 3 for use in the above, and the kicker 5 slides against the left side frame 1 at the starting position to push the lever 9 to operate the switch 4, and the return spring 6 restores the kicker 5.

FIG. 2 is a partially cutaway front view showing a second embodiment of the present invention, which is a further simplified structure of the embodiment shown in FIG.

In the home position detecting mechanism shown in FIG. 2, the switch 7 is an integrated switch of the switch 4, kicker 5 and return spring 6 shown in FIG.

The above-described embodiment shows an example of the detection switch mechanism including the switch 4 having the lever 9 as the detection switch mechanism, the kicker 5 and the return spring 6 in the first embodiment, and the switch 7 having the lever 10 in the second embodiment. However, the detection switch mechanism is not limited to these, and any mechanism that operates when the carrier approaches the left side frame may be used.

〔The invention's effect〕

The home position detection mechanism of the present invention has a structure in which a switch is mounted on the side of the moving carrier unit, so that the home position can be obtained without adjustment, and even if the position of the carrier changes due to the print density operation, it is always constant. There is an effect that the position can be secured.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention,
FIG. 2 is a partially cutaway front view showing a second embodiment of the present invention,
FIG. 3 is a front view showing an example of a conventional example, and FIG. 4 is a front view showing corresponding portions of a switch and a kicker of the conventional example shown in FIG. 1 ... Left side frame, 2 ... Guide shaft,
3 ... Carrier, 4,7 ... Switch, 5,8 ... Kicker,
6 …… Return spring, 9,10 …… Lever, 11 …… Detent lever, 12 …… Light side frame.

Claims (1)

[Claims] 1. A carrier having a printing mechanism, a switch incorporated in the carrier, and a lever connected to the switch for operating the switch and having one end protruding from the inside of the carrier to the outside of the carrier. A home position detecting mechanism including: a home position detected by the switch by operating the lever when the carrier approaches a starting position.