JPH0825163B2 - Lifting device for automatic lifting and mortising machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic lifting and mortising machine equipped with a lifting device for automatically lifting a cutting head having vertical and horizontal saw blades.

[Conventional technology]

2. Description of the Related Art Conventionally, as shown in FIG. 4, there has been an automatic lifting and lowering machine for raising and lowering a cutting head with a motor for the purpose of labor saving and efficiency improvement of the mortise work.

A motor 8 for raising and lowering the cutting head 5 is erected on the bridge 3, and a raising / lowering feed screw 12 is fixed to the upper end of the cutting head 5, and the feed screw 12 is screwed to a feed gear 11 arranged on the bridge 3. , Projecting largely upward from the bridge 3. Further, a limit bar 20 is hung vertically downward from the bridge 3, and limit switches 18 and 19 provided in the cutting head 5 detect the unevenness of the limit bar 20 to turn ON / OFF, and the upper and lower limit positions of the cutting head 5 are detected. Had been detected.

[Problems to be Solved by the Invention]

In the above configuration, since the lifting motor 8 is on the bridge 3, the product becomes large. Further, when the cutting head 5 is at the upper limit position, the feed screw 12 largely projects upward by the length of the movement amount of the cutting head 5. Therefore, there are problems that the installation place is restricted, and the feed screw 12 projects from the bridge 3 when moving up and down, which easily causes an accident.

In addition, since the feed screw 12 is a rotary type, the feed screw 12 is usually covered with a bellows to prevent contact, but if the bellows comes into contact with the feed screw 12 and is damaged, the feed screw 12 is exposed and rotates. There is a risk that your hands, etc. will come into contact with the feed screw 12.

Regarding the upper and lower limit detection device, the limit bar 20 is supported by the bridge 3 in a cantilever manner, and the length thereof is required to be equal to or more than the movement amount of the cutting head 5. Therefore, when the cutting head 5 is at the upper limit position, since a considerable amount of the length is exposed, there is a problem that the upper and lower limit detection does not work normally because it is susceptible to external impact and is easily deformed. It was

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
It is to make the product compact and prevent accidents due to contact with the feed screw.

[Means to solve the problem]

The above-mentioned purpose is to hold the upper end of a guide bar vertically installed on the base with a bridge, and a cutting head having vertical and horizontal saw blades is fitted to the guide bar so as to be slidable up and down. This is achieved by screwing a feed screw fixedly installed on one side with a feed gear that is rotationally driven by a lifting motor mounted on a cutting head.

[Action]

When the feed gear is rotated by the lifting motor, the cutting head descends with the feed screw as a guide. At this time, since the feed screw is of a fixed type, the feed screw does not protrude from the upper surface of the bridge, and even if a hand or the like touches the feed screw, there is no problem.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side view of an automatic lifting and mortising machine showing an embodiment of the present invention, FIG. 2 is a sectional view of a lifting device, and FIG. 3 is an enlarged view of the cutting head portion of FIG.

In the figure, two guide bars 2 are erected in parallel at the rear end of the base 1, and the upper end of the guide bar 2 is held by a bridge 3. At the front end of the base 1, a vise device 4 for fixing a work material (not shown) is provided. The cutting head 5 fitted to the guide bar 2 has a pair of left and right vertical saws 6 which are cut along the longitudinal direction of the workpiece fixed to the vise device 4, and left and right which are similarly cut along the width direction of the workpiece. It is provided with a pair of side saw circular saws 7 and a circular saw driving motor (not shown) for rotationally driving the circular saws 6, 7.

Further, as shown in FIG. 2, the cutting head 5 is provided with a feed gear 11 having a lifting motor 8 and a ratchet portion 11a.
It is rotatably provided at 0, and the feed gear 11 meshes with the lifting motor 8 via the intermediate gear 9. Bridge 3
At the lower end of the feed gear 11, a feed screw 12 which is screw-fitted to the female screw portion 11a of the feed gear 11 is vertically hung from the bridge 3 to form an elevating device. Cutting head 5 converted into 12 axial movements
Up and down.

Limit bar 13 that can slide vertically on part of the cutting head 5
Through the feed screw 12 so that the limit bar
13, a small-diameter portion 13a having a small diameter in the vicinity of the central portion, and a large-diameter portion 13b, 13b having a large diameter in the upper and lower portions form an uneven portion,
Projections 14 and 15 are formed on the large-diameter portion 13b, respectively. Compression spring 17
Is provided. In addition, upper and lower limit switches 18 and 19 for detecting the upper and lower limits of the cutting head 5 are provided inside the cutting head 5, and the limit switches 18 and 19 are for raising and lowering when the cutting head 5 reaches the upper and lower limit positions. Electrical connection is made so as to cut off the power supply to the motor 8 and stop the lifting motor 8.

The limit bar 13 has a downward urging force of the compression spring 16,
By normally balancing the upward biasing force of the compression spring 17, the limit switches 18 and 19 are normally in contact with the small diameter portion 13a. From the upper surface of the cutting head 5, the upper end portion of the limit bar 13 serving as the upper limit detection portion of the cutting head 5
13c is exposed, and from the lower surface of the cutting head 5 as well, the lower end portion 13 of the limit bar 13 serving as the lower limit detection portion of the cutting head 5 is exposed.
d is exposed. The bridge 3 is formed with an abutting portion 3a with which the upper end portion 13c abuts, and the base 1 is also formed with an abutting portion 1a with which the lower end portion 13d abuts.

In the above-mentioned structure, when a not-shown raising / lowering switch is turned down, the raising / lowering motor 8 rotates in the forward direction to rotate the feed gear 11, and the cutting head 5 descends with the feed screw 12 as a guide. At this time, since the lifting motor 8 is mounted on the cutting head 5 and the feed screw 12 is vertically fixed from the bridge 3, the feed screw 12 does not protrude from the upper surface of the bridge 3. Further, since the feed screw 12 is a fixed type, even if a hand or the like touches the feed screw 12, there is no problem.

When the cutting head 5 reaches the lower limit position, the limit bar 13
The lower end portion 13d of the lower end contacts the abutting portion 1a of the base 1, and the limit bar 13 is pushed up against the urging force of the compression spring 16 as shown by the chain double-dashed line in FIG. The contact position of moves from the small diameter portion 13a to the large diameter portion 13b,
Lower limit switch 19 due to unevenness of limit bar 13
Goes in. Then, the power supply to the lifting motor 8 is cut off and the lowering of the cutting head 5 is stopped.

When the lifting switch is turned on, the lifting motor 8
Is reversed and the feed gear 11 is rotated in reverse, so that the cutting head 5 is raised. At this time, the limit bar 13
The urging force of returns to the neutral position. When the cutting head 5 reaches the upper limit position, the upper end portion 13c of the limit bar 13 contacts the abutting portion 3a of the bridge 3, and the limit bar 13 is pushed down against the urging force of the compression spring 17, and the limit bar 13
The upper limit switch 18 is turned on due to the change in the unevenness, the power supply to the lifting motor 8 is cut off, and the lifting of the cutting head 5 is stopped. When the cutting head 5 is lowered again, the limit bar 13 returns to the neutral position by the urging force of the compression spring 17.

In this embodiment, the upper end of the feed screw 12 is connected to the bridge 3
However, the lower end of the feed screw 12 may be fixed on the base 1.

〔The invention's effect〕

According to the present invention, the lifting motor is attached to the cutting head, and the feed screw is fixed to either the bridge or the base, so that the product can be made compact and the feed screw is fixed. Therefore, it is possible to prevent an accident due to contact with the feed screw.

[Brief description of drawings]

FIG. 1 is a side view of an automatic lifting and mortising machine showing an embodiment of the present invention, FIG. 2 is a sectional view of a lifting device, FIG. 3 is an enlarged view of the cutting head portion of FIG. 1, and FIG. It is a front view of an automatic hoisting and removing machine showing a technique. 5 is a cutting head, 8 is a lifting motor, 9 is an intermediate gear,
11a is a female screw portion, 11 is a feed gear, and 12 is a feed screw.

Claims (1)

[Claims] 1. A guide bar vertically mounted on a base is held by a bridge, and a cutting head having vertical and horizontal saw blades is vertically slidably fitted to the guide bar. An elevating device for an automatic hoisting and removing machine, characterized in that a feed screw fixed to either one of them and a feed gear rotatably driven by an elevating motor mounted on a cutting head are screwed together.