JPH0746105Y2 - Power transmission device for two-person tea picking machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a power transmission device for a two-person tea picking machine.

[Conventional technology]

A conventional power transmission device for a two-person tea plucking machine will be described with reference to FIGS. 4 and 5 together with a hair clipper type tea plucking machine.

As shown in FIG. 4, in the conventional hair clipper type tea plucking machine, the machine casing 1 is composed of side plates 1a and 1b, a bottom plate 1c and an upper frame 1d, front and rear openings are provided, and one side of the machine casing 1 is provided. A prime mover 2 and a blower 3 driven by the prime mover 2 are coaxially and integrally mounted on the upper portion. As shown in FIG. 5, a cutting blade drive case 4 made of aluminum die casting is provided on one side of the bottom plate 1c below the blower 3, and the cutting blade drive case 4 is connected to the front edge of the bottom plate 1c. Along with this, upper and lower hair clipper-type cutting blades 5 and 6 are reciprocally arranged with a predetermined stroke. Although not shown, the cutting blades 5 and 6 are held reciprocally with respect to the bottom plate 1c at a position close to the side plate 1b.

A cutting blade drive shaft 7 is projected upward from the cutting blade drive case 4, and a transmission shaft 9 hanging from a transmission case 8 provided above the cutting blade drive case 4 and a joint 10 are attached to the drive shaft 7. Connected through. An input pulley 12 is attached to an input shaft 11 protruding upward from the transmission case 8, and power is transmitted to the input pulley 12 from an output pulley 13 fixed to an output shaft 2a of the prime mover 2 via a belt 14. It has become so. Although not shown, the belt 14 is provided with a tension pulley that presses and separates from the outer peripheral side of the belt 14 to form a tension clutch mechanism.

The blower pipe 15 communicating with the blower outlet of the blower 3 is arranged along the diagonally upper front of the cutting blades 5 and 6, and the blower pipe 15 has a large number of air outlets 16 facing the cutting blades 5 and 6. They are arranged side by side at a predetermined interval, and less than the blower pipe 15 is closed by a side plate 1b on the other side of the machine casing 1.
Handles 17 and 18 are attached to the upper frames 1d on both sides of the machine casing 1 (the handle 18 shows a folded state).

The conventional hair removal type tea plucking machine configured as described above is
Two workers located on both sides of the tea ridge handle 17,1 respectively
By holding 8 and driving the prime mover 2, the cutting blades 5 and 6 are operated via the blower 3 and the tension clutch, and in this state, the tea ridge is advanced in its longitudinal direction. By doing so, tea leaves are cut off by the reciprocating cutting blades 5 and 6. The cut tea leaves are accommodated in a tea leaf accommodating bag (not shown) in the rear by the wind blown by the blower 3 being blown out from the air outlet 16 through the blower pipe 15.

[Problems to be solved by the invention] The hair clipper type tea plucking machine for two-person operation as described above has a machine weight of about 48 to 49 when the seed tea plucking machine was first developed.
It weighed about 20 kg, but now it is 12 kg.
Although it is light to the extent that it can be held by the operator,
It is hard work to cut tea leaves for 6 to 8 hours per day, and it is desired to further reduce the weight due to the increasing age of tea workers.

Further, in the conventional hair clipper type tea plucking machine as described above, the cutting blade drive shaft 7 projects upward from the cutting blade drive case 4, and the drive case is provided on the driving shaft 7 above the cutting blade drive case 4. Since the transmission shaft 9 hanging from 8 is connected via the joint 10, the axes of the drive shaft 7 and the transmission shaft 9 are easily displaced, and therefore, the vibration easily occurs at the position of the joint 10. was there. Further, in the conventional case, since the transmission case 8 is provided above the cutting blade drive case 4 and the drive shaft 7 and the transmission shaft 9 are connected via the joint 10, the case, the shaft, the bearing, the gear, etc. In many cases, this caused the total weight of the aircraft to be heavy. Further, in the hair clipper type tea plucking machine for two-person work, the load on the cutting blades 5 and 6 is small, and the cutting blades 5 and 6 may be driven even when the tension clutch is disengaged, which is dangerous.

The present invention makes it possible to reduce the weight and cost of the tea plucking machine as a whole by reducing the weight and cost of the machine body, and also it is possible to improve the transmission efficiency while simplifying the power transmission path from the tension mechanism to the cutting blade. An object of the present invention is to provide a power transmission device that surely stops driving of the cutting blade when the tension mechanism is turned off.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides (1) a clipper type cutting blades 5 and 6 are installed along the front edge of a bottom plate 1c of a machine casing 1 having front and rear openings, and on one upper side of the machine casing 1. A motor 2 and a blower 3 are mounted, and a blower pipe 15 communicating with an outlet of the blower 3 is arranged diagonally above and above the cutting blades 5 and 6 so that the blower pipe 15 faces the cutting blade direction. A plurality of exhaust ports 16 are arranged side by side, and a transmission shaft 9 is projected upward from the cutting blade drive case 4 provided at the ends of the machine casing 1 on the side of the prime mover 2 and the blower 3, and the upper end of the transmission shaft 9 is provided. In the tea picking machine for two persons, in which power is transmitted from the output shaft 2a of the prime mover 2 through the belt tension mechanism, the belt tension mechanism rolls the belt 24 from the inside to rotate the belt 24. This tension pulley 2 is provided with a tension pulley 25 that is in a transmission state when tension is applied to the outer side of rotation. When the tension pulley 25 acts on the belt 24, the belt presser 30 is provided so as to separate from the belt 24 when the tension pulley 25 acts on the belt 24, and to contact the belt 24 when the tension pulley 25 separates from the belt 24. The process of transmitting power from the tension mechanism to the cutting blades 5 and 6 is performed from the cutting blade drive case 4 to the drive shaft case.
23, and the input pulley 12
The cutting blade drive shaft 22 with the cutting blade drive shaft 22 attached, the transmission gear 21 attached to the lower end of the cutting blade drive shaft 22 and the cutting blade drive gear 20 meshing in the cutting blade drive case 4 are integrally attached to the cutting blade drive shaft 20. A cutting eccentric cam 19 and the cutting blade drive case 4 and the drive shaft case 23 are fixed to the machine casing 1. (2) The blower 3, the cutting blade drive case 4 and the drive shaft case 23 are connected to each other. , Composed of magnesium die-cast, which is an ultra-light and light alloy, respectively.

[Action]

The power transmission device according to the present invention simplifies the process of transmitting power from the conventional belt tension mechanism to the cutting blade as much as possible, and enables power transmission without waste to increase weight while increasing strength while achieving low weight. By reducing the cost, the tea plucking machine as a whole can be made light and inexpensive. Also, while simplifying the power transmission path from the tension mechanism to the cutting blade, the transmission efficiency is good, and when the tension mechanism is turned off, the cutting blade drive is stopped without fail, and a power transmission device with excellent performance is obtained. To be

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. The same parts as those of the above-mentioned conventional example are designated by the same reference numerals and detailed description thereof will be omitted.

The power transmission device of the clipper type tea plucking machine according to the present embodiment integrally mounts a cutting blade drive gear 20 coaxially with the cutting blade drive eccentric cam 19 in the cutting blade drive case 4 and meshes with the gear 20. A cutting blade drive shaft 22 having a transmission gear 21 attached to the lower end extends upward through a drive shaft case 23, and an input pulley 12 is attached to the upper end thereof. Further, the cutting blade drive case 4 and the drive shaft case 23 are fixed to the machine casing 1 with screws as shown in FIG. Therefore, the power transmission device of the present invention is
Transmission case 8 and joint 10 compared to the conventional ones
Gears, shafts, bearings, etc. are omitted.

A belt wound between the input pulley 12 and the output pulley 13
On the belt 24, a tension pulley 25 pivotally supported by the tip of a tension arm 26 whose base end is pivotally supported by a shaft 26a is directed toward the outer side on the inner peripheral side (rotation inner side) of the belt 24.
It is movably provided between a tension position for pressing and a non-tension position that is separated from the belt 24 inward. An operation wire 27 is connected to the tension arm 26, and the operation wire 27 is operated by a clutch lever (not shown) provided near the handle 18.

Further, the tip end of the tension arm 26 moves along with the rotation of the tension arm 26, and when the tension pulley 25 is in the non-tension position, it contacts the belt 24 to prevent the belt 24 from rotating together, and the tension pulley 25 tensions. A belt retainer 30 is provided so as to be away from the belt 24 when in the position. In addition, the tension arm
A tension spring 28 is stretched between the tip of 26 and a belt retainer / spring retainer 29 fixed to the machine casing 1 side. When the tension pulley 25 is in the non-tension position, the belt 24
It is pulled to a position away from. Further, the belt retainer / spring retainer 29 has a function of retaining the belt 24 in the vicinity of the output pulley 13.

In this embodiment, the conventional transmission case 8, joint 10, gear, bearing, shaft, etc. are omitted as described above, and the cutting blade drive case 4, drive shaft case 23,
By using a magnesium die cast, which is said to be the lightest of the light alloys, for the casing of the blower 3, the total weight of the airframe was 12 kg or more.
It was possible to reduce the weight by less than kg.

In the power transmission device for a two-person tea plucking machine having such a structure, two operators are provided on both sides of the tea ridge, respectively.
By holding the 7,18 and driving the prime mover 2, the cutting blades 5 and 6 are operated via the blower 3 and the power transmission device, and in this state, the tea ridge is advanced in its longitudinal direction to reciprocate the cutting. blade
Tea leaves are cut by 5,6. The cut tea leaves are blown backward and stored in the tea leaf storage bag when the air blown by the blower 3 is blown out from the air outlet 16 through the blower pipe 15.

At this time, in the power transmission device, the tension arm 26 is rotated by pulling the operation wire 27 by the clutch lever, and the tension pulley 25 tensions the belt 24 as shown by the phantom line in FIG. Input pulley 12
Transmits rotational power to. At this time, belt presser 30 is belt
Away from 24. The transmission gear 21 is rotated from the input pulley 12 through the cutting blade drive shaft 22, and the cutting blade drive gear 20 meshing with the transmission gear 21 drives the cutting blade drive eccentric cam 19 to drive the cutting blade.
It reciprocates 5,6.

When the operating wire 27 is loosened by the clutch lever, the tension arm 26 is pulled by the tension spring 28 and the belt 24
The belt 24 is loosened, the input pulley 12 stops rotating, and the cutting blades 5 and 6 stop driving. At this time, the belt presser 30 is in contact with the belt 24 and the belt 24 is the output pulley.
It is prevented from going around with 13. Further, the belt retainer / spring retainer 29 also functions similarly to the belt retainer 30.

[Effect of device]

As described above, according to the power transmission device of the tea picking machine for two persons of the present invention, the belt tensioning mechanism rolls the belt 24 from the inner side of the rotation to apply the tension toward the outer side of the belt 24. When the tension pulley 25 is operated together with the tension pulley 25 to apply tension to the belt 24, the tension pulley 25 moves away from the belt 24, and the tension pulley 25 moves away from the belt 24. Is provided with a belt retainer 30 that is in contact with the belt 24, and the process of transmitting power from the belt tension mechanism to the cutting blades 5 and 6 is projected upward from the cutting blade drive case 4 via the drive shaft case 23. , A cutting blade drive shaft 22 having an input pulley 12 attached to its upper end, a transmission gear 21 attached to the lower end of the cutting blade drive shaft 22 and a cutting blade drive gear 20 meshing in the cutting blade drive case 4 Since the cutting blade drive case 4 and the drive shaft case 23 are fixed to the machine casing 1 by the eccentric cam 19 for driving the cutting blade, the belt retainer 30 contacts the belt 24 when the tension mechanism is turned off. Cutting blade
It is safe because the drive of 5 and 6 is surely stopped. In addition, the process of transmitting power from the belt tension mechanism to the cutting blades 5 and 6 is simplified as much as possible to reduce the weight of the machine body, and the strength and durability are increased, vibration is reduced and stable transmission accuracy is good. Power transmission is achieved. Further, the structure is simplified, power can be transmitted without waste, the weight is reduced, the cost is reduced, and the tea plucking machine as a whole can be manufactured lightweight and inexpensive. Furthermore, by constructing the case parts of the blower 3, the cutting blade drive case 4, and the drive shaft case 23 with an ultralight light alloy such as magnesium die-cast, the weight of the machine can be further reduced than before. It is possible to provide a two-person tea plucking machine that reduces operator fatigue and is highly useful.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a power transmission device in a hair clipper type tea plucking machine according to an embodiment of the present invention, FIG. 2 is a bottom view showing the power transmission device, and FIG. 3 is according to the present invention. FIG. 4 is a side view of a hair clipper type tea plucking machine, FIG. 4 is an overall front view of a conventional example and a hair clipper type tea plucking machine to which the present invention is applied, and FIG. 5 is a side view of a hair clipper type tea plucking machine according to a conventional example. . 1 ... machine casing, 1a, 1b ... side plate, 1c ... bottom plate, 1d ... upper frame, 2 ... motor, 2a ... output shaft, 3 ... blower,
4 ... Cutting blade drive case, 5, 6 ... Hair clipper type cutting blade, 7 ...
… Cutting blade drive shaft, 8… Transmission case, 9… Transmission shaft, 10…
… Joint, 11 …… Input shaft, 12 …… Input pulley, 13…
… Output pulley, 14 …… Belt, 15… Air duct, 16… Air outlet, 17,18… Handle, 19… Cutting blade drive eccentric cam, 20
…… Cutting blade drive gear, 21 …… Transmission gear, 22 …… Cutting blade drive shaft, 23 …… Drive shaft case, 24 …… Belt, 25 …… Tension pulley, 26 …… Tension arm, 27 …… Operation Wire, 28 ... tension spring, 29 ... belt retainer / spring retainer, 30 ... belt retainer.

Claims (2)

[Scope of utility model registration request] 1. A bottom plate (1c) of a machine casing (1) having front and rear openings.
A hair clipper-type cutting blade (5, 6) is installed along the front edge of the machine casing (1).
A blower pipe (15) having a prime mover (2) and a blower (3) mounted on the upper part of one side of the blower and communicating with the outlet of the blower (3)
Is disposed along the diagonally upper front of the cutting blades (5, 6), and a plurality of air discharge ports (16) facing the cutting blade direction are arranged in parallel in the blower pipe (15). ) Prime mover (2) and blower (3)
A transmission shaft (9) is provided so as to project upward from the cutting blade drive case (4) provided at the side end, and the belt tension is applied from the output shaft (2a) of the prime mover (2) to the upper end of the transmission shaft (9). In a two-person tea plucking machine configured to transmit power through a mechanism, the belt tensioning mechanism rolls against the belt (24) from the inside to rotate the belt (24) toward the outside. A tension pulley (25) is provided that puts it in a transmission state when it is applied, and it works together with this tension pulley (25) to separate from the belt (24) when the tension pulley (25) applies tension to the belt (24). , A belt retainer (30) is provided so as to contact the belt (24) when the tension pulley (25) is separated from the belt (24), and the power is transmitted from the belt tension mechanism to the cutting blades (5, 6). The process of The cutting blade drive shaft (22), which protrudes upward from the case (4) via the drive shaft case (23) and has the input pulley (12) attached to its upper end, and the cutting blade drive shaft (22) Transmission gear (21) mounted on the lower end
And a cutting blade drive eccentric cam (19) integrally mounted with a cutting blade drive gear (20) that meshes in the cutting blade drive case (4), and the cutting blade drive case (4) and drive shaft A power transmission device for a two-person tea plucking machine, wherein a case (23) is fixed to a machine casing (1). 2. The blower (3), cutting blade drive case (4)
The power transmission device of the tea picking machine for two persons according to claim (1), characterized in that the case portion of the drive shaft case (23) is made of magnesium die-cast which is an ultra-lightweight alloy.