JPH0414213Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a printing device that performs printing by a printing head that reciprocates along a printing line.

[Prior Art] A conventional printing device has a print head that is supported so as to be able to reciprocate along a print line, and a driving means such as a step motor attached to a frame corresponding to one end of the print line, and a driving means for moving the print line. A part of the connecting means such as a driving belt or a driving wire stretched approximately parallel to the print line is attached between the driven means rotatably supported by the frame corresponding to the other end side, and the driving means is connected to the driving means. The print head is driven back and forth as the printer is driven.

The means for applying tension to tension the connecting means between the driving means and the driven means includes applying tension by urging the driven means with the elastic force of a spring means. Alternatively, the driven means is rotatably supported, and a bearing member, a part of which is rotatably latched to the frame, is tilted by a screw or the like to apply the required tension.

[Problem to be solved by the invention] However, in the former case, as the number of parts increases and work efficiency during device assembly is taken into consideration, the elastic force of the spring means becomes weaker, causing the connecting means to become under tension. I couldn't get enough tension to make it work. In addition, in the latter case, as with the former, the number of parts increases, and it is difficult to maintain the parallel state between the continuous means and the printing line due to the tilting of the bearing member, making it difficult to smoothly reciprocate the printing head. I couldn't do it.

[Purpose of the invention] In view of the above-mentioned conventional drawbacks, the purpose of the invention is to
It is an object of the present invention to provide a printing device in which tension can be easily applied to a connecting means stretched between a driving means and a driven means, and the printing head can be smoothly reciprocated.

[Means for Solving the Problems] To this end, the present invention provides a printing device that prints using a print head that reciprocates along a print line on a printing paper, in which a frame is attached to one side of the frame corresponding to one end of the print line. The attached driving means, the driven means attached to the other side of the frame corresponding to the other end of the printed line, and the driven means are stretched between the driven means and the driven means, and a part of the printed line is connected to the printed line. A connecting means attached to the head and a plurality of supporting parts are attached to the other side of the frame corresponding to the driven means, each having a different distance from the driving means, and rotatably supporting the driven means. A printing device is constituted by the bearing means.

[Operation of the invention] According to the invention, the bearing means of the driven means is formed with a number of support parts each having a different distance from the driving means and rotatably supporting the driven means. The driven means is supported by a required support portion corresponding to the length of the connecting means stretched between the driving means and the driven means, so that the driven means is stretched between the driving means and the connecting means. Tension can be applied to the connecting means to tighten it. This makes it possible to print print data while smoothly reciprocating the print head via the tensioned connection means.

[Embodiment] An embodiment in which the present invention is implemented in a dot impact type dot printer will be described below with reference to the drawings.

In FIG. 1, which schematically shows the printer, a platen 5 is rotatably supported between a pair of left and right frames 3a and 3b of a dot printer 1, and a platen drive motor (not shown) such as a step motor or a DC motor is connected to the platen 5. ) are concatenated. As a result, the platen 5 is rotated in a desired direction as the platen drive motor is driven, and the printing paper 7 mounted on the platen 5 is fed. A pair of carriage guides 9 are disposed horizontally between the frames 3a and 3b, and the carriage 1 is mounted on the carriage guides 9.
1 is slidably supported parallel to the axis of the platen 5. A carriage drive motor 13 such as a step motor or a DC motor constituting a drive means is fixed to the one frame 3a at a position corresponding to between the pair of carriage guides 9, and the rotation shaft of the carriage drive motor 13 is fixed to the one frame 3a. A toothed drive pulley 15 is fixed thereto. A toothed driven pulley 17 constituting a driven means is rotatably supported on the other frame 3b at a position corresponding to between the pair of carriage guides 9 via a bearing member 27, which will be described later. and the drive pulley 15
A toothed belt 19 constituting a connecting means is stretched substantially parallel to the axis of the platen 5 between the drive pulley 17 and the driven pulley 17, and a portion of the toothed belt 19 is fixed to the carriage 11. As a result, as the carriage drive motor 13 is driven, the carriage 11 is reciprocated approximately parallel to the printing lines on the printing paper 7.

A dot impact type printing head 21 is attached to the carriage 11, and the printing head 2
1 selectively drives a large number of built-in electromagnetic devices (not shown), and prints print data in a dot matrix format by causing a printing wire (not shown) corresponding to the electromagnetic device to perform a printing operation. Ru.

In FIG. 2 showing how the bearing member is attached to the frame, a cutout 23 through which the toothed belt 19 can pass is formed in the one frame 3b, and the upper and lower sides of the frame 3b corresponding to the cutout 23 are formed in the one frame 3b. is a large number of latching holes 2 constituting a part of the latching means.
5a to 25c are drilled at required pitches in a direction orthogonal to the axis of the platen 5, respectively. A bearing member 27 constituting a bearing means is attached to the retaining holes 25a to 25c so that its position can be changed. The bearing member 27 has a hole 27a and a hole 27a in the center.
It is composed of a pair of upper and lower support arms 27b and 27c sandwiching the support arms 27b and 27c, and the side surface thereof is formed into a substantially U-shape. A pair of upper and lower locking pins 29a and 29b, which constitute a part of the locking means, are attached to the side surfaces of the support arms 27b and 27c on the frame 3b side, corresponding to the locking holes 25a to 25c. Further, a large number of recesses 31a to 31d constituting a support portion are provided on the outer surfaces of the support arms 27b and 27c (on the opposite side from the frame 3b) so that the distances from each recess to the axis of the drive pulley 15 are different. It is formed stepwise in a direction perpendicular to the axis of the Tsuji guide 9. And each recess 31a located above
An engaging protrusion 33 is integrally formed on the shaft support surface 31d so as to continue in a direction orthogonal to the axis of the carriage guide 9. A shaft 17a is attached to the center of the driven pulley 17, and an engagement groove 17b is formed around the upper end of the shaft 17a. The driven pulley 17 is connected to the driving pulley 15 in a required recess 31a selected according to the distance between the shafts of the driven pulley 17.
31d, the engagement groove 17 is provided in the engagement protrusion 33.
b is engaged and rotatably supported.

The operation of the dot printer 1 constructed as described above will be explained with reference to FIGS. 2 and 3.

In FIG. 2, a required recess 31a (in FIG. 2,
After selecting the recess 31a where the distance between the axes of the driving pulley 15 and the driven pulley 17 is the shortest,
A platen 5 in which a line connecting the recess 31a and the axis of the drive pulley 15 is substantially parallel to the printing line of the printing paper 7.
Select the closer latching hole 25c. After the bearing member 27 is attached to the frame 3b by engaging the retaining pins 29a and 29b in the retaining holes 25c, the shaft 17a of the driven pulley 17 is rotatably supported in the recess 31a to drive the A toothed belt 19 is stretched between the pulley 15 and the driven pulley 17. At this time, since the engagement groove 17b engages with the engagement protrusion 33, the vertical movement of the driven pulley 17 rotatably supported in the recess 31a is restricted. As a result, the toothed belt 19 is stretched between the driven pulley 17 and the drive pulley 15, which are pivotally supported by the bearing member 27, substantially parallel to the print line and under tension with the required tension.

In the above state, the carriage drive motor 13
When the carriage drive motor 13 is driven, the carriage drive motor 13 is driven through the toothed belt 19 which is tensioned between the drive pulley 15 and the driven pulley 17 and is stretched substantially parallel to the printing lines of the printing paper 7. Force is applied to the carriage 11 so that the print head 21
It is reciprocated in the direction of the solid arrow shown in the figure. At this time, since the toothed belt 19 is stretched approximately parallel to the printing lines on the printing paper 7, the sliding resistance between the carriage guide 9 and the carriage 11 is reduced.
The printing head 23 can be smoothly reciprocated. Further, the drive pulley 15 and the driven pulley 17
Since the toothed belt 19 is tensioned with the required tension between the print head 21 and the print head 21, the print head 21 can be reciprocated with high responsiveness. As the print head 21 moves back and forth, it selectively drives a large number of built-in electromagnetic devices based on print data to cause the corresponding print wire to perform a printing operation.
As a result, the print data is printed in a dot matrix.

In FIG. 3, which shows a state in which the tension of the toothed belt 19 is changed, the toothed belt 19 is stretched due to the reciprocating drive of the print head 21.
When the stretched state of the toothed belt 19 is loosened, the required recess 31d (in FIG. 3, the distance between the axes of the driving pulley 15 and the driven pulley 17 is the longest) A recess 31d) is selected, and a locking hole 25a is selected in which a line connecting the recess 31d and the drive pulley 15 is approximately parallel to the print line. After the latching pins 29a and 29b are latched into the latching holes 25a and the mounting position of the bearing member 27 with respect to the frame 3b is changed, the shaft 17b is pivotally supported in the recess 31d, and the driving pulley 15 and the driven pulley 17 are A toothed belt 19 is stretched between the two. At this time, since the driven pulley 17 is pivotally supported in the recess 31d selected according to the width of extension of the toothed belt 19, the toothed belt 19 is in tension between the drive pulley 15 and the driven pulley 17. It will be stretched. Further, in order to change the attachment position of the bearing member 27 to the frame 3b according to the recess 31d, the toothed belt 19 is stretched substantially parallel to the print line. The print head 21 reciprocates via the toothed belt 19 whose tension is adjusted as described above.
The print data is printed in a dot matrix.

In this way, in this embodiment, the toothed belt 1 is stretched between the driving pulley 15 and the driven pulley 17.
By appropriately changing the recesses 31a to 31d in which the driven pulley 17 is pivotally supported according to the length of the toothed belt 19, the toothed belt 19 can be tensioned. Also, a recess 31 in which the driven pulley 17 is supported pivotally.
By changing the mounting position of the bearing member 27 with respect to the frame 3b according to a to 31d, the toothed belt 19 is stretched approximately parallel to the printing line to reduce the sliding resistance of the carriage 11 against the carriage guide 9, The printing head 21 can be smoothly reciprocated.

[Effects of the invention] As described above, the present invention makes it possible to easily tension the connecting means stretched between the driving means and the driven means, and to smoothly reciprocate the printing head. It is possible to provide a printing device that obtains the following information.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the printer, FIG. 2 is a perspective view showing how the bearing member is attached to the frame, and FIG. 3 is a perspective view showing the effect of changing the tension of the toothed belt. In the figure, 1 is a dot printer as a printing device, 3
a, 3b are frames, 7 is printing paper, 13 is a carriage drive motor constituting a part of the drive means, 1
5 is a drive pulley constituting a part of the drive means, 17
19 is a toothed belt that constitutes a connecting means; 21 is a print head;
Reference numerals 25a to 25c denote locking holes constituting a part of the locking means, 27 a bearing member as a bearing means, 27a a hole, 29a and 29b locking pins constituting a part of the locking means, 31a, 31d is a recess serving as a support portion.

Claims (1)

[Claims for Utility Model Registration] (1) A printing device that prints using a print head that reciprocates along a print line on printing paper, comprising: a driving means attached to one side of a frame corresponding to one end of the print line; , a driven means attached to the other side of the frame corresponding to the other end of the printing line, and a connection stretched between the driving means and the driven means and partially attached to the printing head. and a bearing means that is attached to the other side of the frame corresponding to the driven means, and is formed with a number of support parts each having a different distance from the driving means and rotatably supports the driven means. A printing device characterized by: (2) The printing device according to claim 1, wherein the support portion is a recess opened outward in the extending direction of the other end of the print line, and is formed in large numbers in a step-like manner. (3) The bearing means has a surface that comes into contact with the frame on the opposite side of the recess, and is attached to the frame so that the position of the bearing means with respect to the frame can be changed along the direction in which the recesses are arranged in a stepped manner. The printing device according to claim 2, which is provided with a latching means for selectively latching the printing device. (4) The driven means has a shaft protruding in both directions of the axis of rotation, and the bearing means has a hole in the center of which the driven means is disposed and through which the connecting means passes, and the bearing means has a hole on both sides of the hole. The printing device according to claim 2, which has the recess for supporting a shaft.