JPH0331108A - Transport mechanism - Google Patents

Abstract

PURPOSE:To smoothly perform movement in a transport mechanism utilizing a rack and a pinion with stop of the movement of a rack by engaging the rack to a running carriage through a spring force. CONSTITUTION:A door 3 is opened, a pinion 22 in a first room 1 is rotated clockwise to move a rack 9, a pulley 6 is run on a rail 5a, and a running carriage 7 is entered into a second room 2. The rack 9 is engaged with a pinion 22 in the second room 2. At this time, when the engagement at first between the rack 9 and the pinion 22 in the second room 2 is out of order, the rack 9 is moved in the vertical direction by the elastic force of a spring 34 to insure the engagement between the rack 9 and the pinion 22. By this constitution, smooth movement can be attained without stop of the rack.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transport mechanism using a rack and pinion.

(Prior Art) A conventional conveyance mechanism is shown in FIGS. 6 to 8. In these figures, a first chamber 1 and a second chamber 2 are connected via an opening/closing door 3. A rail stand 4a is fixed to the bottom plate 1a of the first chamber l, and a pair of rails 5a are fixed in parallel on the rail stand 4a. A rail stand 4b is also fixed to the bottom plate 2a of the second chamber 2, and a pair of rails 5b having the same track distance as the pair of rails 5a are fixed in parallel on the rail stand 4b. The pair of rails 5a and 5b are arranged on a straight line with a predetermined distance apart. A pulley 6 rides on the pair of rails 5a. The pulleys 6 are provided at both ends of a rotating shaft 7a fixed to the front, middle, and rear portions of the carriage 7, and are located on both sides of the carriage 7. The carriage 7 vertically fixes a holder 8 having a plurality of holes 8a, and a rack 9 is attached at the bottom thereof.

A part of the bottom plate 1a of the first chamber l is provided with four parts fa+,
A stand IO is fixed to the recess 1a+, and two bearing plates lla and 11b are erected in parallel on the stand IO. The drive rotating shaft 13 has two bearing plates lla,
They are each pivotally supported via a bearing I2 at the lower part of the Ilb. Further, an intermediate rotating shaft 16 which is supported via a bearing 15 in the center of the plate 14 has two
The two bearing plates lla and llb are respectively pivotally supported via bearings 17 at their upper portions.

The driving gear 18 is fixed between the two bearing plates lla and llb of the driving rotating shaft 13, and the intermediate gear 19
are the two bearing plates lla and ll of the intermediate rotating shaft 16.
b, and the driving gear 18 and the intermediate gear 19 are in mesh with each other. A pinion shaft 2 is attached to the tip of the plate 14.
0 is pivotally supported via a bearing 21, and a pinion 22 is fixed to the pinion shaft 20, and the pinion 22 meshes with the intermediate gear 19 and also meshes with the rack 9. The plate 14 is the intermediate rotating shaft 16
A spring 23 is suspended between the rear end of the plate 14 and the stand 10.

A fixing plate 25 is attached to the plate 14 via a fixture 24.
is attached, and a stopper 2 is attached to the bearing plate llb.
6 is attached and the plate 14 is about to rotate around the intermediate rotating shaft 16, the tip of the fixed plate 25 is engaged with the stopper 26, so that the rotation of the plate 14 is restricted.

Note that a recess 2a is also provided in a part of the bottom plate 2a of the second chamber 2, and a plate 14 is provided in the recess 2a+ similarly to the first chamber 1.
, a driving gear 18, an intermediate gear 19, a pinion 22, etc. are provided.

Next, the operation will be explained.

When the door 3 is opened and the driving gear 18 of the first chamber 1 is rotated clockwise, the intermediate gear 19 is rotated counterclockwise. The counterclockwise rotation of the intermediate gear 19 causes the pinion 22 to rotate clockwise. pinion 22
As the rack 9 rotates clockwise, the rack 9 moves toward the second chamber 2. As the rack 9 moves, the pulley 6 moves to the rail 5a.
The carriage 7 moves in the direction of the second chamber 2 by running on the top. The carriage 7 enters the second chamber 2, the pulley 6 comes to run on the rail 5b, and the rack 9 comes to mesh with the pinion 22 in the second chamber 2.

(Problem to be Solved by the Invention) In the conventional transport mechanism, as described above, when the traveling platform 7 enters the second chamber 2 from the first chamber 1 and the pulley 6 starts traveling on the rail 5b, the rack 9 comes to mesh with the pinion 22 in the second chamber 2.

However, when the rack 9 and the pinion 22 in the second chamber 2 are about to mesh for the first time, the counterclockwise torque required to rotate the intermediate gear 19 counterclockwise also applies to the pinion 22. 9 and the pinion 22 in the second chamber 2 no longer mesh with each other, the movement of the rack 9 is stopped, and the problem arises that the carriage 7 stops moving in the second chamber 2.

The purpose of this invention is to improve the initial meshing condition between the rack and pinion so that the movement of the rack can be improved without stopping the movement of the rack.
To provide a conveyance mechanism which enables smooth movement of a traveling platform and is inexpensive due to a small number of parts.

(Means for Achieving the Object) In order to achieve the above object, the present invention arranges a plurality of parallel rails having the same track distance on a straight line at predetermined intervals, and A transport mechanism for moving the traveling platform by rotating a pulley of the traveling platform, characterized by comprising a rack that engages with the traveling platform while being biased by a spring, and a pinion that meshes with the rack. be.

(Function) In this invention, when the traveling base moves and the gear and pinion are about to mesh for the first time, and the meshing becomes poor, the rack moves against the spring pressure. ,
Improve the condition of your teeth.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 5 show an embodiment of the present invention. First, in FIGS. 1 and 2, a first chamber l and a second chamber 2 are connected via an opening/closing door 3. .

A rail stand 4a is fixed to the bottom plate 1a of the first chamber l, and a pair of rails 5a are fixed in parallel on the rail stand 4a. A rail stand 4b is also fixed to the bottom plate 2a of the second chamber 2, and a pair of rails 5b having the same track distance as the pair of rails 5a are fixed in parallel on the rail stand 4b. The pair of rails 5a and 5b are arranged on a straight line with a predetermined distance apart. A pair of rails 5a
A pulley 6 is mounted on top. The pulleys 6 are provided at both ends of a rotating shaft 7a fixed to the front, middle, and rear portions of the carriage 7, and are located on both sides of the carriage 7.

The carriage 7 vertically fixes a holder 8 having a plurality of holes 8a. The details of the traveling base 7 are shown in FIGS. 3 to 5, and according to these figures, grooves 31 are provided in the front and rear parts of the traveling base 7, respectively, extending downward from the traveling base 7. The roller shaft 3 is moved across the groove 31.
2 is provided. There are two four holes 3 at the bottom of the running platform 7.
3 are provided at predetermined intervals. A spring 3 is placed inside the recessed hole 33.
4 is housed therein, and its spring 34 presses the rack 9, which is present below the carriage 7 and along the carriage 7, in the vertical direction. Guide fittings 35 are fixed to the front and rear sides of the rack 9 on the side of the running platform 7, and the roller shaft 32 is located in a vertical elongated hole 35a of the guide fittings 35, so that the rack 9 engages with the running platform 7. It is supposed to be done.

Again, in FIGS. 1 and 2, the rack 9 is in mesh with the pinion 22. The pinion 22 is connected to a pair of rails 5a
The pinion shafts 20 are fixed to pinion shafts 20 which are respectively supported via bearings 36.

Note that a pinion 22 is also provided in the second chamber 2.

Next, the operation will be explained.

When the door 3 is opened and the pinion 22 in the first chamber 1 is rotated clockwise, the rack 9 moves, the pulley 6 runs on the rail 5a, and the carriage 7 moves toward the second chamber 2. Move to. Then, the carriage 7 enters the second chamber 2, and the rack 9 comes into mesh with the pinion 22 in the second chamber 2.

At this time, if the meshing condition is poor at first, the rack 9 moves vertically while being pressed by the spring 34, and improves the meshing condition between the rack 9 and the pinion 22. Therefore, the carriage 7 comes to move within the second chamber 2 without stopping the movement of the rack 9.

(Effects of the Invention) According to the present invention, when the traveling base moves as described above and the rack and pinion are about to mesh for the first time, when the meshing becomes poor, the rack resists the spring pressure. The rack moves smoothly and improves the meshing condition, making it possible to smoothly move the carriage without stopping the movement of the rack. Additionally, the number of parts is smaller than in the past, making it cheaper.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of this invention.
The figure is an elevational view showing the whole, Figure 2 is a sectional view taken along line I-I in Figure 1, Figure 3 is an elevational view of the rack engaged with the carriage, and Figure 4 is the carriage. Left side view with rack engaged,
FIG. 5 is a cross-sectional view taken along the line ■-n in FIG. 3. FIG. 6 is an elevational view of the conventional conveyance mechanism, FIG. 7 is a sectional view of the drive gear 18, intermediate gear 19, pinion 22, etc. shown in FIG. 6, and FIG. 8 is the left side of the conventional conveyance mechanism. It is a front view. In the figure, 5a...Rail 5b...Rail 6...Pulley 7...Travel platform 22...-Pinion 34...Spring , the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a transport mechanism that moves a plurality of parallel rails with the same track distance on a straight line at predetermined intervals and rotates a pulley of a running platform on the parallel rails, a spring is used. A conveyance mechanism comprising: a rack that engages with the traveling base while being pressed; and a pinion that meshes with the rack.