JPH0642603A - Linear feed device - Google Patents

Abstract

PURPOSE:To obtain minute displacement and linear movement of a carriage easily with simple, small and cheap constitution, by moving linearly the carriage whose pin is engaged in its spiral groove following the rotation of a rotary disc. CONSTITUTION:When a motor 1 is rotated, a rotary disc 21 fixed to this rotary axis rotates. A spiral groove 20 is formed with the specified pitch in one face of the rotary disc 21. A fixed pin 17 set in a carriage 11 and a position adjustable pin 18 are inserted and engaged in the spiral groove 20. Consequently, the carriage 11 moves linearly as respective pins 17, 18 engaged in the groove 20, following the rotation of the rotary disc 21. At this time, moving amount of the carriage 11 is determined by the pitch of the groove 20. Therefore minute movement of the carriage 11 can be easily obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear feed device, and more particularly to a linear feed device which is used in a positioning device or the like and which requires a minute feed.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a generally used linear feeder using a rack and a pinion, where 1 is a motor, 2 is a speed reducer, 3 is a pinion, 4 is a rack, and 5 is a speed reducer. A case portion 6 for mounting the machine and the rack is a bearing.

The feed amount in this device is determined by the circumferential length of the pinion 3. Due to the performance of the gear train, there is a limit to reducing the circumferential length of the pinion 3, and it is difficult to perform minute feed. For this reason, the speed reducer 2 is usually used when performing minute feed.

Further, when high-accuracy positioning is performed, backlash of the speed reducer becomes a problem, and it is necessary to use a high-grade speed reducer with less backlash such as a harmonic drive.

FIG. 6 shows a ball-screw or lead-screw type feeder used in a high-accuracy positioning device that does not use a speed reducer, 7 is a motor output shaft, 8 is a mounting plate for the motor 1, and 9 is a motor output. Joint 1 on shaft 7
A ball screw or a lead screw 11 connected through 0 is engaged with the ball screw or the lead screw 9, and the linear shaft 1 can be moved in one direction.
A carriage guided by 2, reference numerals 13 and 14 are bearings, and reference numeral 15 is a frame. The feed amount in this device is determined by the screw pitch.

[0006]

However, all of the above-mentioned conventional apparatuses have the drawbacks that the apparatus becomes complicated as a whole, the shape is large and the cost is high in order to realize the minute feed.

The present invention eliminates the above-mentioned drawbacks.

[0008]

SUMMARY OF THE INVENTION A linear feeder according to the present invention comprises a rotary plate provided with a spiral groove, a carriage guided linearly so that the carriage is engaged with the spiral groove. It is characterized in that the carriage is linearly moved through the pin by rotating the rotary plate.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 to 3, a guide groove 16 in which a carriage 11 is formed in a frame 15 is formed.
The carriage 11 is movably supported in one direction, and one and the other pins 17 and 18 are planted on the carriage 11 in front of and behind the center line in the moving direction so as to be spaced apart from each other. Adjustable so that it can be fixed by the fixing screw 19 after adjustment.

Further, in the present invention, the center of a rotating disk 21 having a spirally wound groove 20 having a desired pitch on one surface thereof is fixed to the rotary shaft 7 of the motor 1 and the spirally wound groove 20 is provided with the above-mentioned structure. Pins 17 provided on the carriage 11,
18 is inserted and the spacing between the pins 17, 18 is adjusted so that the pins that hold the wall forming the groove 20 can be clamped at the desired pressure.

Since the linear feed device of the present invention has the above-mentioned structure, when it is used as a positioning device, for example, the motor 1 is controlled by the rotation amount corresponding to the required linear displacement. It rotates according to commands from the device. As a result, the rotary plate 21 fixed to the rotary shaft 7 of the motor 1 also rotates at the same time.

In the spiral groove 20 of the rotary plate 21, a fixed pin 17 and a position-adjustable pin 18 fixed to the carriage 11 which can move in one direction.
Are engaged, and the pin is pushed by the side wall of the groove to move linearly. The feed of the carriage 11 is the same as this displacement, and the feed amount is determined by the pitch of the grooves 20. That is, the carriage 11 linearly moves by the pitch movement amount corresponding to the rotation on the driving side, and it is possible to easily obtain a minute displacement.

[0014]

According to the linear feeder of the present invention, the following effects can be obtained.

A) A spiral-shaped groove formed on the rotary plate,
Since the carriage is moved by the engagement with the pin of the carriage that can move in one direction, a minute displacement can be easily obtained.

B) The backlash is small as compared with a speed reducer using gears.

C) Since no speed reducer or the like is required in the light load region, the number of parts can be greatly reduced, the structure is extremely simple, and the size can be made compact.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a linear feeding device of the present invention.

FIG. 2 is a side view of the linear feeding device of the present invention.

FIG. 3 is a front view of a rotary plate having a spiral groove in the linear feeding device of the present invention.

FIG. 4 is a cross-sectional plan view of a rack and pinion linear feeder using a conventional speed reducer.

FIG. 5 is a side view of a main portion of a rack and pinion linear feeder using a conventional speed reducer.

FIG. 6 is a cross-sectional plan view of a conventional ball screw or lead screw type linear feeder.

[Explanation of symbols]

 1 Motor 2 Reducer 3 Pinion 4 Rack 5 Case 6 Bearing 7 Motor output shaft 8 Mounting plate 9 Ball screw or lead screw 10 Joint 11 Carriage 12 Linear shaft 13 Bearing 14 Bearing 15 Frame 16 Guide groove 17 pin 18 pin 19 Fixed screw 20 Spiral-shaped groove 21 rotating disk

Claims (1)

[Claims] 1. A rotating plate comprising a rotating plate having a spiral groove, a carriage guided linearly and a pin provided on the carriage so as to engage with the spiral groove. The linear feeding device is characterized in that the carriage is linearly moved via the pin.