JPH0633253U - Tachograph recording mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a tachograph recording mechanism capable of accurately detecting the position of a recording needle attached to a guide plate. [Structure] The bearing 10 is attached to the hole of the main plate 27 and the rotary shaft 1
1 is fitted. The heart cam 12 is attached to the tip of the bearing 10 and is engaged with the guide plate 24. Further, a gear 13 is fitted in the central portion of the rotary shaft 11 located on the back side of the main plate 27 to transmit the rotary power from the motor to the rotary shaft 11. The rear part of the rotary shaft 11 extends through a hole of a wiring board 26 on which an electric circuit is formed, and a disc-shaped slit board 14 is attached to the rear end thereof. A plurality of slit plates 14a for forming slits are erected on the periphery of the slit board 14 and engaged with a gap in the central portion of a photocoupler (photosensor) 31 attached to the back surface of the wiring board 26. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tachograph recording mechanism for recording an operation state of a vehicle or the like.

[0002]

[Prior art]

 2. Description of the Related Art A tachograph (driving recorder) has been known that records various types of data when a vehicle is running on a chart paper in multiple stages for use in running management. FIG. 4 shows an example of this kind of tachograph 20 as a sectional view. As shown in the figure, the tachograph 20 has a cylindrical case 21 with a closed bottom surface, and a recording mechanism is housed inside the case 21. A cover 22 rotatably supported by a hinge portion 21a of the case 21 is attached to the opening surface of the case 21, and a chart paper 23 is attached to the inner surface of the cover 22. ing.

The recording mechanism inside the case 21 includes a guide plate 24, a recording needle 25 attached to the guide plate 24, a wiring board 26 in which an electric circuit for controlling these is incorporated, and other motors. And a drive device such as a gear for power transmission. The guide plate 24 is slidably supported by a slide rod 28 fixed to a base plate 27 and arranged in parallel with the surface of the chart paper 23. The guide plate 24 is shown in a plan view of FIG. As described above, the rack 24a is provided, and the pinion type drive gear 29 is meshed with the rack 24a.

The drive gear 29 is normally and reversely rotated by a drive device (not shown) to reciprocate the guide plate 24 in the radial direction (R direction) of the chart paper 23. The recording needle 25 attached to the guide plate 24 is also driven in the direction perpendicular to the movement direction of the guide plate 24 by a driving device (not shown) based on a control signal, and its tip end contacts the surface of the chart paper 23. It is configured to come in and out of contact.

As shown in FIG. 4, a plurality of slit plates 30 for forming slits are provided upright on the lower surface of the guide plate 24. The slit plates 30 are mounted on the wiring board 26. The (photocoupler) 31, 31 is adapted to be engaged with the gap.

In this state, the drive gear 29 rotates, the guide plate 24 advances from the origin in the radial direction of the chart paper 23, and the recording needle 25 is driven by a drive device (not shown) based on the control signal, and the recording needle 25 shown in FIG. ) Suppose that the drive mode moves as shown in FIG. That is, the tip of the recording needle 25 contacts the chart paper 23 between points A and B of the chart paper 23, separates between B and C, contacts between C and D, separates between D and E, and E It is assumed that recording is performed as shown in FIG. In this case, the position of the slit plate 30 associated with the photocoupler 31 is A'when the recording needle 25 is at A, and F'when the recording needle 25 is at F, as shown in FIG. Become. That is, the current position of the recording needle 25 can be known from the signal from the photo sensor 31. When the multi-step recording as shown in FIG. 6B is performed, it is necessary to know the current position of the recording needle 25 in this way. The origin of the guide plate 24 is when the two origin slit plates 30a come to the positions of the photosensors 31, 31, respectively. A clock mechanism is incorporated in the cover 22, and the chart paper 23 rotates about its center.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned recording mechanism, since the recording needle and the slit plate are attached to the same guide plate, the actual recording width (stroke amount) of the recording needle, for example, the chart surface shown in FIG. Since the distance AB is the same as the width A'-B 'of the slit plate shown in FIG. 7, if the recording width is narrowed, the width of the slit plate is naturally narrowed to accurately detect the position of the recording needle. However, there is a limit to the recording accuracy in view of the detection accuracy of the photo sensor.

Further, in the case of such a configuration, as shown in FIG. 4, there is a base plate opening S at the tip of the guide plate, and the photosensor is located directly below this part S (right side in FIG. 4). Even if the cover plate 32 is provided, a scrap such as a chart paper or other foreign matter is likely to enter the photosensor and cause a malfunction.

An object of the present invention is to provide a tachograph recording mechanism capable of accurately detecting the position of a recording needle attached to a guide plate.

[0010]

[Means for Solving the Problems]

 The present invention is directed to a guide plate driven by a drive unit in the radial direction of the chart paper, a position detection unit for detecting the position of the inner plate, and a guide plate attached to the guide plate for controlling the guide plate based on a control signal. A recording needle that is driven in the direction perpendicular to the moving direction is provided, and the position of the guide plate is detected by the signal of the position detecting means to bring the recording needle into and out of contact with the chart paper surface to perform multi-step recording. In the tachograph recording mechanism described above, the position detecting means includes a slit disk that rotates in conjunction with the rotation axis of the guide plate driving means, and a photo sensor that engages with the slit disk and detects the slit position. It is characterized by being configured.

A tachograph recording mechanism according to the present invention is characterized in that the photosensor and the slit board are arranged on the back surface of a wiring board provided in the case of the tachograph.

[0012]

[Action]

 With the above-described structure, when the drive means is rotated and the guide plate is driven in the radial direction of the chart paper, the slit disk rotates in conjunction with the rotation axis of the drive means. Since the photo sensor is engaged with the slit disk, the slit of the slit disk is detected by the photo sensor, and the accurate position of the guide plate, that is, the recording needle is detected. As a result, when the guide plate reaches a predetermined position, the recording needle is driven in the direction perpendicular to the moving direction of the guide plate, and the tip of the recording needle comes into contact with and leaves the chart paper. When the guide plate is driven in the radial direction of the chart paper while the tip of the recording needle is in contact with the chart paper, recording is performed on the chart paper. In this case, if the slit disc diameter is made as large as possible and the slit positions are brought to the peripheral portion of the slit disc, the slit spacing, etc. can be made larger than the actual recording on the chart paper. The position of the recording needle can be accurately known and the recording accuracy can be improved. Further, since these slit boards and photosensors are arranged on the back surface of the wiring board in the case, it is difficult for dust such as scraps of chart paper and chart powder to adhere. Therefore, malfunction does not easily occur.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same or corresponding parts as those described in the related art will be designated by the same reference numerals.

FIG. 1 is a sectional view showing an embodiment of a tachograph recording mechanism according to the present invention. As shown in the figure, a bearing 10 is mounted in a hole of a main plate 27 arranged in the case 21, and a rotary shaft 11 is fitted in the bearing 10. A heart cam 12 is attached to the tip of the rotary shaft 11 protruding from the bearing 10 toward the opening of the case 21, and a guide plate 24 is engaged with the heart cam 12. The guide plate 24 is slidably supported by a slide rod 28 fixed to a main plate 27 and arranged in parallel with the chart paper surface. When the heart cam 12 or the rotary shaft 11 rotates, the guide plate 24 has a radius of the chart paper. It is reciprocally driven in the direction.

A gear 13 is fitted in the central portion of the rotary shaft 11 located on the back side of the main plate 27, and rotational power from a motor (not shown) is transmitted to the gear 13 via a gear train or the like. To be done. The rear portion of the rotary shaft 11 extends through a hole of a wiring board 26 on which an electric circuit is formed, and a disc-shaped slit disk 14 is attached to the rear end thereof. A plurality of slit plates 14a for forming slits are erected side by side in a semicircular shape on the periphery of the slit board 14 as shown in FIG. The slit plate 14a passes through the central gap of the photocoupler (photosensor) 31 attached to the back surface of the wiring board 26 to turn the photocoupler 31 on and off.

Since the present embodiment is configured as described above, when the power of the tachograph is turned on, a motor (not shown) rotates, and this power is transmitted to the gear 13 of the rotating shaft 11 to rotate the rotating shaft 11. 11 rotates. Therefore, the heart cam 12 attached to the rotary shaft 11 also rotates and drives the guide plate 24 back and forth in the radial direction of the chart paper.

With the rotation of the rotating shaft 11, the slit plate 14 interlocked with the rotation of the rotary shaft 11 is rotated, and the slit plate 14 a erected on the peripheral portion of the slit plate 14 sequentially passes through the gap in the central portion of the photocoupler 31. pass. The current position of the guide plate 24, that is, the position of the recording needle 25 can be known from the ON / OFF signal of the photocoupler 31 generated at this time. Therefore, when performing multi-step recording, the respective recording areas are recorded based on this position information. Recording can be performed by contacting the recording needle 25.

In particular, in this embodiment, since the slit plate 14 for detecting the position of the guide plate 25 is arranged on the rotary shaft 11 of the heart cam 12 that drives the guide plate 25, the slit plate 14 has a large diameter and By arranging the position of the slit plate 14a around the slit plate 14, as shown in FIG. 3, for example, the moving distances A ″ to B ″ of the slit plate 14a are larger than the moving distances A to B of the guide plate 24. Since it can be taken, the positional accuracy of the guide plate 24 can be improved, and the recording accuracy can be improved as a whole. In this embodiment, the slit disk 14 is directly attached to the rotary shaft 11 of the heart cam 12, but it can be attached to another shaft that is interlocked with the rotary shaft 11. Further, in this embodiment, since the portion where the slit board 14 and the photo coupler 31 are arranged and the portion where the chart paper is located are blocked by the base plate 27, dust and the like adhere to the slit board 14 and the photo coupler 31. Unlikely. Therefore, the risk of malfunction can be reduced.

[0019]

[Effect of device]

 As described above, according to the present invention, the gap between the slits can be made larger than that in the actual recording on the chart paper, so that the position of the recording needle can be accurately known and the recording accuracy can be improved. In addition, since these slit boards and photosensors are placed on the back side of the wiring board in the case, it is difficult for malfunctions to occur, because scraps of chart paper and dust such as chart powder do not easily attach.

[Submission date] February 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

In particular, in this embodiment, since the slit plate 14 for detecting the position of the guide plate 24 is arranged on the rotary shaft 11 of the heart cam 12 that drives the guide plate 24, the slit plate 14 has a large diameter and By arranging the position of the slit plate 14a around the slit plate 14, as shown in FIG. 3, for example, the moving distances A ″ to B ″ of the slit plate 14a are larger than the moving distances A to B of the guide plate 24. Since it can be taken, the positional accuracy of the guide plate 24 can be improved, and the recording accuracy can be improved as a whole. In addition, in this embodiment, the slit disk 14 is directly attached to the rotary shaft 11 of the heart cam 12, but it may be attached to other shafts interlocked with the rotary shaft 11. Further, in this embodiment, since the portion where the slit board 14 and the photo coupler 31 are arranged and the portion where the chart paper is located are blocked by the base plate 27, dust and the like adhere to the slit board 14 and the photo coupler 31. Unlikely. Therefore, the risk of malfunction can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a tachograph recording mechanism according to the present invention.

FIG. 2 is a sectional view taken along line XX of the recording mechanism of the tachograph shown in FIG.

FIG. 3 is a diagram illustrating a comparison between a moving distance of a slit of a slit board and a moving distance of a guide plate.

FIG. 4 is a cross-sectional view of a conventional tachograph recording mechanism.

FIG. 5 is a plan view of a guide plate and a drive gear portion of a conventional tachograph recording mechanism.

FIG. 6A is a diagram showing a drive mode, and FIG. 6B is a diagram showing recording on a chart paper.

FIG. 7 is a diagram showing a relationship between a conventional slit plate and a photo sensor.

[Explanation of symbols]

 11 rotating shaft 12 heart cam 14 slit board 14a slit plate 24 guide plate 25 recording needle 26 wiring board 27 base plate 31 photocoupler (photo sensor)

Claims (2)

[Scope of utility model registration request] 1. A guide plate driven by a drive unit in a radial direction of a chart sheet, a position detection unit for detecting a position of the guide plate, and a moving direction of the guide plate attached to the guide plate based on a control signal. A recording needle driven in the vertical direction is provided, and the position of the guide plate is detected by the signal of the position detecting means to bring the recording needle into and out of contact with the chart surface to perform multi-step recording. In the tachograph recording mechanism, the position detecting means is composed of a slit disk that rotates in conjunction with the rotation axis of the guide plate driving means, and a photo sensor that engages with the slit disk and detects the slit position. Recording mechanism of tachograph characterized by. 2. A recording mechanism for a tachograph according to claim 1, wherein the photosensor and the slit board are arranged on a back surface of a wiring board provided in a case of the tachograph.