JPH0234045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a tension adjustment mechanism for a belt used in a horizontal movement transmission means for a printing head in a printer.

[Conventional technology]

Conventionally, a belt driven by a motor has been used as a means for moving the print head in a printer, and the belt has a mechanism for adjusting the tension thereof as necessary.

Below, a conventional belt tension adjustment mechanism will be explained based on the drawings.

FIGS. 7 and 8 are side views of essential parts of conventional belt tension adjustment mechanisms, respectively.

In FIG. 7, 1 is a rubber belt that locks a carriage equipped with a printing head (not shown); 2
3a and 3b are idler pulleys that support the rotation of the rubber belt 1; 4 are idler pulley brackets;
is a belt tension adjustment screw screwed into the idle pulley bracket 3b, 5 is a lock nut screwed into the belt tension adjustment screw 4, 6 is a base frame fixing the idle pulley bracket 3a, 7 is a side frame of the printer, 8 is a cover.

To explain the movement of the adjustment mechanism configured as described above, loosen the lock nut 5 with a spanner, rotate the belt tension adjustment screw 4 with a screwdriver, move the idle pulley 2 together with the bracket 3b by a desired amount, and then loosen the lock nut 5 with a spanner. The work has now been completed.

Next, another conventional example will be explained based on FIG.

In Fig. 8, 1 is a rubber belt, 2 is an idle pulley, 3c is an idle pulley bracket, and 6
7 is a base frame, 7 is a side frame of the printer, and 8 is a cover, which are the same as the conventional example described above, so the same reference numerals are used. Numeral 9 is a belt tension adjustment screw disposed from the bracket 3c to the outside of the side frame 7, and 10a and 10b are lock nuts screwed onto the belt tension adjustment screw 9.

To explain the movement of the adjustment mechanism configured as described above, the lock nuts 10a and 10b are rotated with a spanner, and the idler pulley 2 can be moved by a predetermined amount together with the idler pulley bracket 3c.

[Problem that the invention attempts to solve]

However, in the conventional example shown in FIG. 7 as described above, the lock nut 5 and belt tension adjustment screw 4 must be operated using a screwdriver and a spanner, which is time consuming. Further, in the conventional example shown in FIG. 8, the lock nuts 10a and 10b must also be operated. Therefore, there were problems such as poor workability, and the work was restricted by the height of the cover 8 since the work was done from the side, making the workability even worse.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a rubber belt that locks and rotates a carriage equipped with a printing head, one side of which is supported by a motor pulley, and the other is supported by an idler pulley rotatably attached to an idler pulley bracket. In a belt tension adjustment mechanism for a print head supporting and movably mounting an idle pulley bracket on a base frame, a hole is provided in the idle pulley bracket;
A locking portion for the operating tool is provided on the base frame corresponding to the hole.

The locking portion is a notch or a knurl provided on the base frame.

[Effect]

In the above-mentioned configuration, the operating tool is inserted from above and locked in the notch or knurled locking part,
By tilting the operating portion, the idler pulley and the idler pulley bracket are moved by a desired amount, thereby moving the idler pulley and the idler pulley by a desired amount together with the idler pulley bracket, thereby adjusting the tension of the rubber belt.

〔Example〕

Hereinafter, the first, second and third parts of the present invention will be explained according to the drawings.
An example will be explained.

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a plan view of the main part thereof, and FIG. 3 is a side view thereof.

In the figure, 11 is the print head, 12 is the carriage on which the print head 11 is mounted, 13 is the guide shaft of the carriage 12, and 14 is the carriage 12.
15 is a motor that drives the rubber belt 14; 16 is a rubber belt 1;
17 is an idler pulley that supports the other side of the rubber belt 14; 18 is an idler pulley bracket that rotatably supports the idler pulley 17; 19 is a long hole in the idler pulley bracket 18; 20 is an idler pulley that supports the other side of the rubber belt 14; A hole provided in the idle pulley bracket 18, 21 a base frame, 22 a fixing screw screwed into the base frame 21 from the long hole 19 to fix the idle pulley bracket 18, and 23 a locking screw formed in the base frame 21. The notch 23 serves as a stop, and the reason why the notch 23 is in two stages is to adjust the pulley 16 of the motor 15 to correspond to different printing pitches.
This is to accommodate the amount of change since the distance between the pulley 16 and the idle pulley 17 changes when the number of teeth is changed.

Next, the operation of the first embodiment with the above configuration will be explained.

First, loosen the fixing screw 22 fixing the idle pulley bracket 18 so that it can slide freely. Next, as shown in FIG. 3, insert an operating tool 24 such as a flathead screwdriver from above the printer through the hole 20 of the idle pulley bracket 18 and the notch 23 of the base frame 21, that is, the hole 20 and the notch 23. The idle pulley bracket 18 is passed through the formed through-hole 25 and tilted in the opposite direction to the rubber belt 14 with the base frame 21 side as a fulcrum.
At the same time, the idle pulley 17 is moved by a desired amount to increase the tension of the rubber belt 14.

When a predetermined tension is obtained, the fixing screw 22 is tightened at the position of the idle pulley bracket 18.

FIG. 4 is a side view of main parts showing the second embodiment,
Reference numeral 26 denotes a knurled hole provided on the base frame 21 at the position of the hole 20 of the idler pulley bracket 18. Since the other parts are the same as those in the previous embodiment, they are indicated by the same reference numerals and their explanation will be omitted.

In this second embodiment, a knurled part 26 as a locking part is used instead of the notch part 23 in the first embodiment.
has been established.

For this purpose, in the same procedure as in the first embodiment, the operating tool 24 is attached to the idler pulley bracket 1.
The idler pulley bracket 18 can be protruded from the hole 20 of No. 9 and locked onto the knurl 26, and the idler pulley bracket 18 can be moved as in the first embodiment.

Incidentally, there is an eccentric stud as a means for adjusting the movement of one part of two parts assembled together with respect to the other part.

FIG. 5 is a plan view of the main part showing the case where this eccentric stud is used in a belt tension mechanism, and FIG. 6 is a side view thereof, and 27 is an eccentric stud having a locking groove for the operating tool 24. The eccentric stud 27 is eccentrically axially fixed within the hole 20 of the idler pulley bracket 18 and rotatably fixed to the base frame 21. The other parts are the same as those of the conventional example and are designated by the same reference numerals.

To explain the movement, when the operating tool 24 is pushed into the groove of the head of the eccentric stud 27 and rotated, the eccentric stud 27 changes its wall thickness within the hole 20 of the idler pulley bracket 18. Become. Therefore, the idle pulley bracket 18 can be moved by a desired amount by changing the wall thickness.

In this way, even when using the eccentric stud 27, the tension of the rubber belt 14 can be changed by moving the idle pulley bracket 18 by operating the operating tool 24 from above the printer. Since the number of parts increases, the first and second embodiments described above are effective from the viewpoint of simplifying the configuration.

[Effects of the invention] As explained above, in the present invention, a hole is provided in the idle pulley bracket, and a locking part by a notch or a knurled part of the operating tool is provided on the base frame corresponding to the hole. This has the effect that the belt tension can be adjusted by moving the idle pulley bracket by a desired amount with the simple operation of locking the operating tool inserted from above in the locking portion and tilting it.

In addition, the number of parts is kept to a minimum and the structure is simple, and since adjustment work is done from above instead of from the side as in the past, work efficiency is improved without being restricted by the cover. It also has the effect of being able to further measure improvements.

Furthermore, even when there are a plurality of idle pulleys, the shape of the base plate can be utilized to change the position at which the tip of the operating tool is locked.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the first embodiment of the present invention, Fig. 2 is a plan view of the main part thereof, Fig. 3 is a side view thereof, and Fig. 4 is a side view of the main part showing the second embodiment. Fig. 5 is a plan view of the main part showing the case where the eccentric stud is used in the belt tension mechanism, Fig. 6 is a side view thereof, Fig. 7 is a side view of the main part showing a conventional example, and Fig. 8 is another conventional example. FIG. 11...Print head, 12...Carriage, 1
4... Rubber belt, 15... Motor, 16... Pulley, 17... Idle pulley, 18... Idle pulley bracket, 20... Hole, 21... Base frame, 23... Notch, 24... Operation Ingredients, 26... knurled eyes, 27... eccentric studs.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. One side of a rotating rubber belt that locks a carriage equipped with a printing head is supported by a pulley of a motor, and the other is supported by an idler pulley rotatably attached to an idler pulley bracket. ,
In a belt tension adjustment mechanism for a print head in which an idle pulley bracket is movably attached to a base frame, a hole is provided in the idle pulley bracket;
A belt tension adjustment mechanism for a printing head, characterized in that a locking part for an operating tool is provided on a base frame corresponding to the hole. 2. The belt tension adjustment mechanism for a print head according to claim 1 of the utility model registration claim, characterized in that the locking portion of the operating tool is a notch provided in the base frame. 3. The belt tension adjustment mechanism for a print head according to claim 1 of the utility model registration claim, characterized in that the locking portion of the operating tool is a knurled eye provided on the base frame.