JP2528293Y2 - Print head parallelism adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used in equipment having a printing mechanism, for example, a printer or a time clock, so that the position of a printing head with respect to a platen can always be kept parallel. A print head parallelism adjusting device.

2. Description of the Related Art Conventionally, for example, a position adjustment method of a print head of a time clock has an eccentric bearing at both ends of one guide shaft of a pair of guide shafts and rotates an adjustment lever integrated with one of the eccentric bearings. The upper guide shaft is displaced in the up and down direction by interlocking the eccentric bearings, and this displacement causes the carrier to rotate around one guide shaft, and the distance between the print head on the carrier and the platen to the thickness of the time card. Was adjusted to an appropriate value to correspond to

[Problem to be Solved] In the conventional example, although the position of the print head with respect to the lime recorder protein can be adjusted, the parallelism with respect to the surface of the platen does not appear, and there is no correction mechanism for providing the parallelism. There is an inconvenience that the density of the print appears depending on the distance from the print surface.

SUMMARY OF THE INVENTION It is an object of the present invention to accurately determine the parallelism of a print head to a platen.

[Means for Solving the Problems] The parallelism adjusting device according to the present invention is a pair of guide shafts which are installed between base plates in parallel with each other, and the print head is mounted to be movable in the axial direction via a carrier. A bearing that eccentrically supports both ends of the pair of one guide shafts, a position adjustment lever of a print head, a parallelism adjustment lever, a parallelism adjustment plate, and the parallelism adjustment lever. Connecting means for connecting the parallelism adjusting plate. The position adjustment lever of the print head is rotatable integrally with one of the bearings rotatably mounted on one of the base plates, and has an operation lever.

The parallelism adjustment lever has a shaft support at the center of rotation, and the shaft support supports the shaft end of the one guide shaft whose axis coincides with the shaft support.

The parallelism adjusting plate is disposed between the parallelism adjusting lever and the other ground plate, and provided with a connecting portion concentrically coupled to the shaft supporting portion, and a sleeve bearing eccentric to the shaft supporting portion. And is rotatably mounted on the other ground plate via the sleeve bearing around the sleeve bearing as a center of rotation.

The other bearing is composed of the shaft support, the connecting portion, and the sleeve bearing, and the one guide shaft is inserted through these.

[Operation] The parallelism adjusting plate is rotated around the sleeve bearing in a state in which the shaft end on the position adjusting lever side of one guide shaft is fixed, and the connection between the parallelism adjusting plate and the parallelism adjusting lever is released. With this rotation, the shaft end of the guide shaft on the parallelism adjusting plate side moves around the rotation center of the sleeve bearing with this rotation, the guide shaft is inclined, and the parallelism of the print head is adjusted. .

[Embodiment] In FIG. 1, a pair of guide shafts 3 and 4 are laid in parallel with each other between a base plate 1 and a base plate 2, and a print head 6 is connected via a carriage (carrier) 5 which extends between the guide shafts. The print head 6 is mounted above the guide shaft 4 so as to be movable in the axial direction of the guide shaft.
Connected to.

As shown in FIG. 3, one (right-hand side) shaft end 3a of one guide shaft 3 is formed in a D-shaped cross section, and
A part of a position adjusting mechanism A provided on the side is formed, and is eccentrically supported by a bearing 7 rotatably mounted on the main plate. Shaft end of the other (left side in FIG. 5) of the guide shaft 3
3b also has a D-shaped cross section and forms a part of the parallelism adjusting mechanism (device) B provided on the other main plate 2 side.
Shaft support 11 that constitutes a bearing rotatably mounted on
a, eccentrically supported by the sleeve bearing 12a and the connecting portion 12b.

First, the position adjustment mechanism A will be described, and then the parallelism adjustment mechanism B will be described.

The position adjusting mechanism A includes a position adjusting lever 8, a position adjusting plate 9, and a fixing screw 10 for fixing the position adjusting plate.

As shown in FIGS. 3 and 4, the position adjusting lever 8 has a bearing 7 integrally provided at the rotation center thereof, and the bearing has an eccentric D-shaped shaft hole 7a. A plurality (three in the drawing) of rack grooves 8a is formed on the left outer periphery of the position adjusting lever 8 in FIG. 4, and a plane L-shaped operation lever 8b is protruded from the side of the rack groove.

The position adjusting plate 9 is rotatably supported by the bearing 7 between the one base plate 1 and the position adjusting lever 8 as shown in FIGS. 3, 4, and 5. The position adjusting plate 9 has a circular bearing hole 9a at the upper part and an adjusting long hole 9b at the lower part. The bearing 7 of the position adjusting lever 8 is fitted in the bearing hole 9a, and the position adjusting plate 9 and the position adjusting lever 8 are
Can be relatively rotated around the center. A fixing screw 10 is inserted into the adjusting slot 9b, and the position adjusting plate 9 is fixed to the main plate 1 by tightening the fixing screw. By loosening the fixing screw 10, the position of the position adjusting plate 9 can be adjusted. The position adjusting plate 9 has a click claw 9c that engages with the rack groove 8a.
The click lever 9c provided with l is provided. The click claw 9cl is engaged with a central rack groove of the rack grooves 8a at a reference position (shown by a chain line in FIG. 4) indicating a standard thickness of a time card as a sheet. When the time card is thin with respect to the click claw 9cl, the rack groove at the upper end corresponds to the click card 9cl, and when the time card is thick, the rack groove at the bottom corresponds to the click card 9cl. Two stopper pins 9d and 9e are projected upward and downward from the side surface of the click lever 9c, and the swing range of the operation lever 8b is regulated by both stopper pins.

 Now, the parallelism adjusting mechanism B will be described.

As shown in FIGS. 1 and 2, the parallelism adjusting mechanism includes a parallelism adjusting lever 11, a parallelism adjusting plate 12, and a connecting screw 13 for connecting the parallelism adjusting plate. I have.

The parallelism adjustment lever 11 is provided integrally with a shaft support 11a at the center of rotation, and an adjustment slot 11b bent in an arc around the shaft support is formed below the shaft support. Is provided with a pointed indicating protrusion 11c. The shaft end 3b of the guide shaft 3 is supported by a D-shaped shaft hole 11al provided at the center of the shaft support 11a.

The parallelism adjusting plate 12 is disposed between the parallelism adjusting lever 11 and the main plate 2 as shown in FIGS. 1, 2, and 5. The parallelism adjusting plate 12 has a sleeve bearing at its center of rotation.
12a is provided, and a connection hole 12b which is a connection portion is formed on one side surface,
A connection screw hole 12c is formed below the connection hole. The shaft end 3b of the guide shaft 3 passes through the hole 12al of the sleeve bearing 12a and the connection hole 12b, but the connection hole 12b is eccentric with respect to the sleeve bearing 12a. A shaft support 11a of the parallelism adjustment lever 11 is rotatably fitted in the connection hole 12b, and the connection hole 12b is
Concentric with 11a. For this reason, the sleeve bearing 12a is eccentric with the shaft support 11a, and the axis of the guide shaft 3 is eccentric from the sleeve bearing 12a. The parallelism adjusting plate 12 is rotatably mounted on the base plate 2 via the sleeve bearing 12a via the sleeve bearing 12a. The shaft support 11a, the connection hole 12b, and the sleeve bearing 12a constitute a bearing for the shaft end 3b of the guide shaft 3.

The center of rotation of the sleeve bearing 12a coincides with the center of rotation of the bearing 7.

The parallelism adjusting lever 11 and the parallelism adjusting plate 12 are connected to each other by a connecting screw 13 which is inserted through the adjusting slot 11b of the parallelism adjusting lever and screwed into a screw hole 12c of the parallelism adjusting plate. By loosening the connecting screw 13, the parallelism adjusting plate 12 and the parallelism adjusting lever 11 can be relatively rotated about the shaft support 11a as a center of rotation, and one of the rotation angles is indicated by the projection 11c.
And the scale 12d on the side surface of the parallelism adjusting plate 11 to check the parallelism.

The mutual operation of the position adjusting lever 8, the parallelism adjusting lever 11, and the guide shaft 3 will be described.

When the position adjusting lever 8 is pivotally rotated about the bearing 7, the parallelism adjusting lever connected to the parallelism adjusting plate 12 is rotated.
11 also rotates about the sleeve bearing 12a in the same direction as the position adjustment lever 8. The guide shaft 3 moves around the center of the bearing 7 according to the rotation of the position adjusting lever 8 because the shaft ends 3a and 3b are eccentrically positioned with respect to the bearing 7 and the sleeve bearing 12a. The end moves up and down.

In the parallelism adjusting lever 11, the parallelism adjusting plate 12
When the parallelism adjusting plate 12 is turned, the sleeve end 12b turns around the axis of the sleeve bearing through the shaft supporting portion 11a which is eccentric to the sleeve bearing 12a.
At this time, the shaft end 3a of the guide shaft 3 cannot move because the position adjusting lever 8 is fixed to the position adjusting plate 9 through the click lever 9c. As a result, the entire guide shaft 3 is inclined toward the shaft end 3b.

 Next, the operation of adjusting the position of the print head 6 will be described.

For example, at the time of shipment of the time clock, fine adjustment is made so that the distance between the print head 6 and the platen can be adapted to a time card having a standard thickness so that the print head is at an optimum position.

To this end, the fixing screw 10 is loosened to release the fixation of the position adjusting plate 9, and the position adjusting plate is slightly swung about the bearing 7 so that the click claw 9cl is adjusted to the standard position. At this time, the click claw 9cl is inserted into the rack groove 8a of the position adjustment lever 8.
And the position adjusting lever 8 also swings by swinging of the position adjusting plate.
Also, the carriage 5 swings around the bearing 7 and the rear end of the carriage 5 slightly moves up and down, so that the distance between the print head 6 and the platen is finely adjusted. After the fine adjustment, the position adjusting plate 9 is fixed to the main plate 1 by tightening the fixing screw 10 again.

When using a time card having a thickness different from that of the time card, the following position adjustment operation is performed.

If the time card is thick, hold the tip of the operation lever 8b and move it upward. Then, the click claw 9cl engages with the lower rack groove 8a. During the engagement process, the position adjusting lever 8 rotates about the bearing 7, and the guide shaft 3 moves about the bearing 7, so that the rear end of the carriage 5 moves downward, and the print head 6 moves the guide shaft 4. And the distance between the print head and the platen is widened to accommodate thick time cards.

If the thickness of the time card is thin, the user moves the lower end of the carriage 5 by holding the tip of the operation lever 8b and moves the print head 6 forward about the guide shaft 4 by moving the rear end of the carriage 5 upward. Then, the distance between the print head and the platen is adjusted to be narrow, so that it can be used for thin time cards. At the corresponding stage, since the click claw 9cl engages with the upper rack groove 8a, the position of the adjustment lever 8 is held.

 Next, the parallelism adjustment operation will be described.

The adjustment of the parallelism is performed in parallel with the fine adjustment operation described above when the time clock is shipped.

FIG. 7 is an explanatory view schematically showing the positional relationship between the guide shaft 3, the bearing 7, and the sleeve bearing 12a. The guide shaft 3 is viewed from the rear of the head in FIG. FIG. 7 is a sectional view of the left end 30 and the right end 31 of the guide shaft 3 as viewed from the right side of the guide shaft 3, respectively.
12a, the bearing 7 is shown together with the view seen from the right side of the guide shaft 3 in FIG.

In FIG. 7 (A), the guide shaft 3 is parallel to the time clock corresponding to FIG. 5, and in this state, when the time clock is shipped, the connecting screw 13 shown in FIG.
When the parallelism adjusting plate 12 is turned by a predetermined angle in the counterclockwise direction in FIG. 1, for example, the sleeve bearing 12a in FIG.
The clockwise rotation is started from the position of FIG. At this time, the position adjusting plate 9 of the bearing 7 is fixed to the base plate 1 with the fixing screw 10, and the click claw 9 cl of the position adjusting plate is moved to the position adjusting lever 8.
It does not rotate because it is engaged with the rack groove 8a. For this reason, the shaft end 3b of the guide shaft 3 also rotates by the same angle around the center of the sleeve bearing 12a by an amount corresponding to the rotation of the sleeve bearing 12a by a predetermined angle, and the left end 30 of the guide shaft 3 descends. 3 is inclined downward to the left as shown in FIGS. 6 and 7 (B) to adjust the parallelism.

Although not shown, contrary to the above, when the parallelism adjusting plate 12 is rotated by a predetermined angle in the clockwise direction in FIG. 1 from the state of FIG. Then, the degree of parallelism is adjusted by inclining rightward. After adjusting the parallelism, the parallelism adjusting plate 11 and the parallelism adjusting plate 12 are connected with the connecting screw 13.

Although it is necessary to provide a plurality of rack grooves 8a, by increasing the number, it is possible to cope with a wide range of sheet thicknesses, and fine adjustment can be made by making the rack groove pitch fine.

The position adjusting mechanism A includes the position adjusting lever 8 and the position adjusting plate 9 in the above example, but is not necessarily limited to using the position adjusting plate, and adjusting the position of the print head using only the position adjusting lever. After the adjustment, the position adjustment lever may be directly fixed to the main plate.

In the parallelism adjusting mechanism B, the connection relationship between the shaft support 11a and the connection hole 12b may be any part as long as either one is a projection and the other is a fitting part that fits into the projection.

[Effect] According to the present invention, by providing a position adjusting lever on one side of one of the paired guide shafts and providing a parallelism adjusting lever and a parallelism adjusting plate on the other side, a print head for the platen is provided. And the position of the print head can be adjusted according to the thickness of the paper.

[Brief description of the drawings]

1 is a perspective view, FIG. 2 is an exploded perspective view of a main part, FIG. 3 is a perspective view showing a use state of the position adjusting device, FIG. 4 is an exploded perspective view showing a main part of the position adjusting device, 5 is an enlarged sectional view showing the state of the support of one guide shaft, FIG. 6 is an enlarged sectional view showing the state of the support of one guide shaft after adjusting the parallelism, and FIG. It is explanatory drawing which shows a relationship. 1,2 ... base plate, 3 ... guide shaft, 3a, 3b ... shaft end, 5 ...
Carriage (carrier), 6 print head, 7 bearing, 8 position adjustment lever, 11 parallelism adjustment lever,
11a: shaft support, 12: parallelism adjusting plate, 12a: sleeve bearing, 12b: connecting portion (connecting hole), 13: connecting screw (connecting means), B: parallelism adjusting mechanism.

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of guide shafts which are installed between base plates in parallel with each other, and which are mounted so that a print head is movable in an axial direction via a carrier, and both ends of one of the pair of guide shafts. An eccentrically supported bearing and one of the bearings rotatably mounted on one of the base plates are integrally rotatable, and are provided with a position adjustment lever of a print head having an operation lever; A shaft support portion is provided, and in this shaft support portion, the parallelism adjustment lever supporting the shaft end of the one guide shaft whose axis is coincident with the shaft center, and the parallelism adjustment lever and the other ground plate Placed between
A connecting portion concentrically connected to the shaft support is provided, a sleeve bearing eccentric to the shaft support is provided, and the sleeve bearing is rotatably mounted on the other main plate via the sleeve bearing with the sleeve bearing as a center of rotation. A parallelism adjusting plate, and a connecting means for connecting the parallelism adjusting lever and the parallelism adjusting plate, and the other bearing is constituted by the shaft supporting portion, a connecting portion, and a sleeve bearing; A parallelism adjusting device for a print head, wherein the one guide shaft is inserted through the guide shaft.