JPH0529319U - Transverse shift structure of seedling planting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to perform the lateral feed shift operation of the seedling stand only when the predetermined pitches of the lateral feed strokes match. [Structure] A group of passive gears 18a to 18d are arranged in parallel on a cylinder shaft 17 which is externally fitted to the feed screw shaft 10, and drive gears 19a to 19d which are constantly meshed with the respective passive gears are loosely fitted to the drive shaft 16. The shift member 20A is disposed on the drive shaft 16 between the pair of drive gears 19a and 19b, and the pair of drive gears 1
The shift member 20A is provided with engaging portions 22a and 22b that can be engaged with and disengaged from the engaged portions 21a and 21b of 9a and 19b, respectively.
In addition, the engaging portions 22a, 22b and the engaged portions 21a, 2 only at a constant rotation phase of the pair of drive gears 19a, 19b.
1b is engaged with and disengaged from the engaged portion 21 for each drive gear.
It is set so that the installation phase of a and 21b and the rotation phase of each drive gear match.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seedling lateral feed speed change structure of a seedling planting device capable of changing the lateral feed speed of a seedling stand in order to change the seedling planting amount in multiple stages.

[0002]

[Prior Art]

 Conventionally, as a seedling lateral feed speed change structure of this kind of seedling planting apparatus, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-111317, a feeder that supports a seedling stand in left and right lateral reciprocating movements is provided. A group of receiving gears are arranged side by side at a predetermined interval in the axial direction of a cylinder shaft that is externally fitted to the screw, and a shift gear that is selectively meshed with each of the passive gears is individually fed to the feed shaft. A drive shaft that is parallel to the screw shaft and has a structure in which a spline is fitted slidably in the axial direction is known.

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional structure described above, due to unexpected movement of the feed screw when the passive gear and the shift gear are not meshed with each other during the shift operation, in some cases, the regular teeth of the passive gear and the shift gear may be changed. Since the gear meshes at a position deviated from the meshing position and meshes even if the shift operation is performed during the stroke of the seedling stand, the remaining horizontal feed stroke and the number of horizontal feed pitches match. Since there is a possibility that it will disappear, the stroke end position of lateral feed and the seedling take-out position may be misaligned.

The present invention has been made in view of the above circumstances, and the seedling planting can be performed only when the lateral shifting operation of the seedling placing table can be performed only when the predetermined pitches of the lateral feeding strokes match. The purpose of the present invention is to provide a seedling lateral feed speed change structure of an attachment device.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the seedling lateral feed speed change structure of the seedling planting device according to the present invention has a tubular shaft screw-fitted onto a feed screw shaft that supports the seedling stand so that it can reciprocate left and right. A group of passive gears are arranged side by side at a predetermined interval in the axial direction, and a drive gear that constantly meshes with each of these passive gears is loosely fitted to a drive shaft that is arranged in parallel with the feed screw shaft. A shift member that is rotatable integrally with the shaft and that is slidably operated in the axial direction of the drive shaft is disposed between the pair of drive gears, and the engagement member provided in each of the pair of drive gears. An engaging portion that can be engaged and disengaged with the engaging portion is provided on the shift member, and the engaging portion and the engaged portion can be engaged and disengaged only in a constant rotation phase of the pair of drive gears. Match the installation phase of the engaged part with the drive gear and the rotation phase of each drive gear. Wherein configuration that is set. The actions and effects of this characteristic configuration are as follows.

[0006]

[Action]

 That is, since the passive gear and the drive gear always mesh with each other, the rotational phases of the pair of drive gears on which the shift member engages are the same in the drive gears. When the seedling stand is located at the matched phase position, simply by shifting the shift member, it is possible to engage with the other drive gear while being disengaged from one of the pair of drive gears. When the phases do not match, they cannot be engaged, so the seedling feed pitch does not deviate from the regular feed pitch.

[0007]

[Effect of the device]

 Therefore, shift switching cannot be performed at a position where the pitch of the lateral feed amount deviates from the lateral feed stroke, and it has become possible to eliminate an undesired misalignment of the lateral feed pitch due to shifting of the lateral feed amount.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a riding-type rice transplanter according to the present invention. In this riding-type rice transplanter, a seedling planting device 4 is connected to a rear portion of a wheel-type traveling machine body 1 so as to be moved up and down via a four-link mechanism 3 which is vertically rocked by a hydraulic cylinder 2. At the same time, the power from the traveling machine body 1 is transmitted to the seedling planting device 4.

As shown in FIGS. 2 and 4, the seedling planting device 4 is a planting arm in which a planting arm 6 is rotatably and rotatably attached to a rear end of a transmission case 5 into which power is introduced. A case 7 is continuously provided, and a seedling stand 8 on which seedlings are placed can be reciprocally moved in the left-right lateral direction in association with the seedling planting movement of the planting claws 9 of the planting arm 6. The feed screw is penetratingly supported, and is supported by the shaft 10 and the like, and the grounding float 11 is attached to the lower portion of the transmission case 5. The support structure for the seedling placing table 8 will be described in detail. As shown in FIGS. 2 to 4, the seedling placing table 8 has a seedling take-out port 12 and a lower end side of the seedling placed on the seedling placing table 8. It is laterally slidably attached to the transmission case 5 via a rail member 13 for receiving and supporting the same, and via a pair of support members 15 and 15 which are separately arranged at the left and right ends of the feed screw shaft 10. It is connected to the seedling stand 8 so as to move integrally.

Next, the lateral feed speed change structure will be described. As shown in FIGS. 1 and 2, in the transmission case 5, the feed screw shaft 10 and a drive shaft 16 driven by a power from the traveling machine body 1 via a bevel gear are respectively vertically moved along the left-right direction. And are erected and supported in parallel with each other. In particular, the feed screw shaft 10 is fitted around the cylinder shaft 17 by screwing, and both ends of the cylinder shaft 17 are rotatably supported by the transmission case 5 in a bearing state. Further, four passive gears 18a to 18d are externally fitted and fixed to the cylindrical shaft 17 so that the lateral feed pitch of the seedling placing table 8, that is, the lateral feed speed can be set in four stages. Drive gears 19a to 19d, which are always meshed with the respective passive gears 18a to 18d, are fitted onto the drive shaft 16 in an idling state. Of the four drive gears 19a to 19d, two on the left side and two on the right side are respectively paired, and the shift members 20A and 20B are splined to the drive shaft 16 in the middle of the pair of drive gears. The shift members 20A and 20B are engaged with each other, so that the shift members 20A and 20B are configured to be slidable in the axial direction of the drive shaft 16 while being integrally rotated with the drive shaft 16. The left and right ends of the shift members 20A and 20B serve as engaging portions that can engage with the pin holes 21a to 21d, which are the engaged portions provided in the drive gears 19a to 19d forming the drive gear pair. Pins 22a to 22d are provided so as to project. The shift members 20A and 20B are selectively linked to an operating tool (not shown) so that only one of the shift members can be operated. Here, each set of the passive gears 18a to 18d and the driving gears 19a to 19b is picked up 26, 20, 18, 16 times per lateral feed stroke of the seedling placing table 8 in order from the right and planted. The number of teeth is set so as to set the lateral feed pitch of the seedling stand 8.

Further, each set of pin holes 21a, 21b and 21c, 21d in the pair of drive gears 19a-19d corresponding to each shift member 20A, 20B is driven when the seedling placing table 8 is located at the stroke end. The drive gears 19a, 19b and 19c, 19d, which are paired, are located on a straight line parallel to the axis of the shaft 16, with the pin holes 21a, 21b and 21c, 21d as the centers. The phases are set to match. Of course, the pair of pins 22a, 22b and 22c, 22d in the shift members 20A, 20B are provided so as to project on a straight line parallel to the axis of the drive shaft 16. With this structure, when the seedling placing table 8 is at the stroke end, for example, only by shifting the shift member 20A from one side to the other side, the pin 22a is pulled out from the pin hole 21a and then the pin 22b is moved into the pin hole 21b. Although it can be engaged smoothly, when the seedling placing table 8 is displaced from the stroke end, the phase of the pin hole 21a and the pin hole 21b are displaced, and therefore the shift member 20A is operated by shifting. However, since the pin 22b cannot be engaged with the pin hole 21b, it is impossible to change the lateral seedling feed speed as it is, and it is necessary to once move the seedling placing table 8 to the stroke end.

Next, another embodiment will be described. As shown in (a) and (b) of FIG. 5, the two pin holes 21 and 21 as engaged parts of the drive gear 19 are formed at positions where the phases are shifted by 90 degrees, and these two pin holes are formed. A structure in which two pins 22, 22 that can engage with the 21, 21 are provided on the shift member 20 in a protruding manner, and as shown in (a) and (b) of FIG. The two pin holes 21 and 21 are formed with a large diameter at one position and a small diameter at the other position at a position shifted by 180 degrees, and two pin holes 21 and 21 that can be engaged with these two pin holes 21 and 21 are formed. The shift members 20 may be provided so as to protrude from the shift member 20. Further, as another embodiment, as shown in FIGS. 7 and 8, the engaged portion of the drive gear 19 is a ridge 23 formed in a semi-circular shape centered on the axis of the drive shaft 16, The engaging portion may be configured as a ridge 24 provided with end faces 24a and 24b which can engage with the end faces 23a and 23b of the ridge 23 at positions different in 180 degrees phase.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a seedling lateral feed speed change structure in a transmission case.

FIG. 2 is a schematic explanatory view showing a transmission structure of a seedling planting device.

FIG. 3 is a rear view showing the vicinity of the seedling take-out port of the seedling stand.

[Figure 4] Overall side view showing rice transplanter

FIG. 5 is a side view showing a drive gear and a shift member of a seedling lateral feed transmission structure according to another embodiment.

FIG. 6 is a side view showing a drive gear and a shift member of a seedling lateral feed transmission structure according to another embodiment.

FIG. 7 is a perspective view showing a drive gear of a third alternative embodiment.

FIG. 8 is a perspective view showing a shift member of a third alternative embodiment.

[Explanation of symbols]

 8 seedling stand 10 feed screw shaft 16 drive shaft 17 cylinder shaft 18a to 18d passive gear 19a to 19d drive gear 20A, 20B shift member 21a to 21d engaged portion 22a to 22d engaging portion

Claims (1)

[Scope of utility model registration request] 1. A cylindrical shaft (1) screw-fitted onto a feed screw shaft (10) for supporting a seedling stand (8) so as to be reciprocally moved laterally.
7) A passive gear (18
a-18d) groups are arranged side by side, and the drive gears (19a-19a-
19d) is loosely fitted to the drive shaft (16) arranged in parallel with the feed screw shaft (10) to be rotatable integrally with the drive shaft (16) and in the axial direction of the drive shaft (16). A shift member (20A or 20B) slidably provided on the drive gear (19a, 19b or 19c, 19d) is provided between the pair of drive gears (19a, 19b or 1).
9c, 19d) provided with engaged parts (21a, 21d)
b or 21c, 21d) engaging portion (22a,
22b or 22c, 22d) and the shift member (20A
Or 20B), and the pair of drive gears (19
a, 19b or 19c, 19d) only at a constant rotational phase of the engaging portion (22a, 22b or 22c, 22)
d) and the engaged portion (21a, 21b or 21c, 21)
d) so that it can be engaged with and disengaged from the drive gears (19a, 19b).
Alternatively, the engaged parts (21a, 21) with respect to 19c, 19d)
b or 21c, 21d) is set so that the installation phase of each drive gear (19a, 19b or 19c, 19d) and the rotation phase of each drive gear (19a, 19b or 19c, 19d) are set to be the same.