JPS6222379Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention supports an endless carriage feed belt that transmits driving force from a drive source to a carriage on which a printing head is placed and which reciprocates along the printing line between the left and right frames. It is related to the device.

PRIOR ART In general, this type of carriage transport belt gradually loosens due to the reciprocating movement of the carriage, and there is a risk that the carriage may not move smoothly. Conventionally, one side of the pulley on which the feed belt is hung is supported with screws, etc. so that it can be moved and adjusted, and when the feed belt becomes slack, the position of the pulley is moved and adjusted to absorb the slack in the feed belt. Ta. Therefore, the adjustment operation is very troublesome, and the assembly is complicated because screws and the like are required.

Purpose This invention was devised to eliminate the above-mentioned defects of the prior art.The purpose of this invention is to keep the feed belt under constant tension through the action of springs and stoppers so that the carriage can move smoothly at all times. To provide a support device for a carriage feed belt which is easy to assemble without using screws or the like.

Embodiment An embodiment embodying this invention will be described below with reference to the drawings.
A carriage (not shown) on which a printing head (not shown) is mounted is supported between a and 1b so as to be able to reciprocate along the printing line. A pair of pulleys 2 are supported on the left and right frames 1a and 1b by a pulley support member 3 on the left side and on the rotating shaft 5 of a motor 4 on the right side, and an endless belt is provided between the two pulleys 2. A carriage conveying belt 6 having a shape of 60 mm is stretched so as to extend along the printing line. The carriage is connected to a part of the carriage feed belt 6, and the drive force from a drive source such as the motor 4 is transmitted to the carriage through the feed belt 6 to cause the carriage to reciprocate. There is.

Next, the supporting structure of both pulleys 2 will be explained in detail. As shown in FIG. Rotating shaft 5
It is designed to be able to rotate as well. Further, as shown in FIGS. 1 and 3, the left side frame 1b is provided with a fitting hole 7 in the upper horizontal direction, a through hole 8 in the center, and a locking hole 9 in the lower vertical direction. An insertion hole 10 is formed perpendicular to the locking hole 9, and a circular insertion hole 11 is provided above the insertion hole 10 so as to be continuous with the upper portion of the locking hole 9.

Further, as shown in FIG. 3, the left pulley support member 3 is formed by bending a plate material, and has a fitting protrusion 12 at its upper end and a shaft stop for fixing the spindle of the pulley 2 at its center. A hole 13 is formed. An engaging piece 14 having a stepped portion 14a and a hanging piece 14b is formed projecting from the lower part of the pulley support member 3, and a sawtooth-shaped hooking portion 14c is provided on the hanging piece 14b. The pulley support member 3 fits the fitting protrusion 12 at the upper end into the fitting hole 7 of the left side frame 1b with some play in the upper part, and the proximal end of the engaging piece 14 is engaged. It is adapted to be supported by the left frame 1b in a state where it is engaged with the stop hole 9.

Further, as shown in FIG. 3, a support plate 15 having an engagement groove 15a and a pair of guide grooves 15b is fitted in advance into the insertion hole 10 of the left frame 1b, and the pulley support member 3 is inserted into the left frame 1b. 1b
When attached to the engagement groove 15a of the support plate 15
The engagement piece 14 of the pulley support member 3 is engaged with the pulley support member 3. A spring 16 is fitted and supported in the guide groove 15b of the support plate 15, and its end portion is engaged with the stepped portion 14a of the engagement piece 14. Therefore, the pulley support member 3 has a fitting protrusion 1 so that the distance between the shafts of both pulleys 2 always increases.
It is urged to rotate clockwise in FIG. 1 about the base end of 2.

A stopper 17 is provided below the support plate 15.
is rotatably disposed, and its tip engages with the serrated hook portion 14c of the pulley support member 3. Further, this stopper 17 is urged to rotate counterclockwise in FIG. 1 by the action of a tension spring 18, and responds to the increase in the distance between the shafts of both pulleys 2 to maintain the distance between the shafts. I'm starting to do that.

Next, a method for assembling the carriage feed belt support device constructed as described above will be explained.

Now, when assembling this support device for the carriage feed belt, one of the pulleys 2 is first fitted onto the rotating shaft 5 of the motor 4. Next, the support plate 15 is inserted into the insertion hole 10 of the left side frame 1b, and then the spring 16 is inserted through the insertion hole 11 and engaged with the guide groove 15b of the support plate 15. In this state, insert the lower part of the left pulley support member 3, which rotatably supported the pulley 2, into the insertion hole 1.
1 and the hooking hole 9 into the inside of the left frame 1b. After the hanging piece 14b passes through the insertion hole 11 and the locking hole 9, the tip of the engaging piece 14 is inserted into the inside of the spring 16, and the engaging piece 14 resists the tension force of the spring 16. While engaging with the engagement groove 15a of the support plate 15, the engagement piece 14 is moved downward to engage the locking hole 9, and the fitting protrusion 12 is fitted into the fitting hole 7. .

Finally, while pressing the pulley support member 3 against the tension of the spring 16 against the left side frame 1b, the endless carriage feed belt 6 is hung between the pulleys 2.
is maintained under constant tension between both pulleys 2 by the action of the spring 16. In this state, the stopper 17 is engaged with the upper end of the hook 14c of the pulley support member 3 by the action of the tension spring 18, as shown in FIG. Therefore, in this carriage feed belt support device,
It can be assembled very easily without using screws or the like.

In addition, in the carriage feed belt support device configured as described above, since the left pulley support member 3 is urged by the spring 16 in a direction away from the right frame 1a, the carriage feed belt 6 is stretched. When this occurs, the left pulley support member 3 is rotated around the base end of the fitting protrusion 12, the distance between the axes of both pulleys 2 is increased, and the elongation of the feed belt 6 is absorbed. . At the same time, the stopper 17 is rotated by the action of the tension spring 18 to the position where it engages with the locking portion 14c, so that the distance between the shafts of both pulleys 2 is reliably maintained in an increased state. Ru. In addition, since the left pulley support member 3 is prevented from moving rightward by the stopper 17, even if an excessive force is applied to the feed belt 6, the pulley support member 3 is prevented from moving to the right by the force of the spring 16. The feed belt 6 does not move so that the distance between the axes between both pulleys 2 becomes small against the
There is no possibility that the printer will vibrate and cause printing errors.

Note that this invention is not limited to the above-described embodiment; for example, the weight of the stopper 17 may be increased so that it rotates downward by its own weight without using the tension spring 18, or the fourth As shown in the figure, the hanging part 14b is not provided with the hanging part 14c, but a fixed locking member 19 is provided below the support plate 15, and a wedge-shaped stopper 17a is provided between the hanging piece 14b and the locking member 19. It is also possible to arbitrarily change the shape, structure, etc. of each part without departing from the spirit of this invention, such as by providing a structure in which a tension spring 18 is used to bias the movement downward.

Effects As detailed above, according to this invention, the feed belt is always kept under tension by the action of the spring and stopper, so that the carriage can move smoothly at all times. This provides an excellent effect in that it can be easily assembled without using screws or the like by simply engaging the members with the frame sequentially from one side.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment embodying this invention, Fig. 2 is a partially cutaway side view, and Fig. 3 is an exploded perspective view showing a part of the pulley support member, support plate, and left side plate. 4 are main part front views showing a stopper portion of a modified example. Frames 1a, 1b, pulley 2, pulley support member 3, rotating shaft 5, feed belt 6, fitting hole 7, fitting hole 10, fitting protrusion 12, support plate 15, spring 16, stopper 17.

Claims (1)

[Scope of claim for utility model registration] Left and right frames 1a and 1b on which the printing head is placed
In a support device for an endless carriage feed belt 6 that transmits driving force from a drive source to a carriage that reciprocates along a print line between lines, the carriage feed belt 6 is stretched and guided along a print line. a pair of pulleys 2; one of the pulleys 2 is supported at an intermediate portion;
A pulley support member 3 rotatably provided in the tensioning direction of the feed belt 6 by means of a protrusion 12 and a hole 7 that fit into each other formed between one end and one frame 1b, and the pulley support member 3 is fitted into a fitting hole 10 formed in the frame 1b corresponding to the other end,
A support plate 15 that supports a spring 16 between itself and the pulley support member 3 moves forward as the distance between the axes of both the pulleys 2 increases based on the action of the spring 16, and changes the rotational position of the pulley support member 3. Stopper 17 that acts to maintain
A support device for a carriage feed belt, characterized by comprising: