SU757270A1 - Apparatus for securing punch of mechanised manual shears - Google Patents

Description

The invention relates to equipment for cutting sheet metal and can be used in the construction of slotted or punching shears with a mechanical drive.

A device for attaching a punch of manual mechanized scissors is provided, comprising a scissor mounted in the slide, rigidly connected to the driven gear sleeve with a threaded hole, carrying a threaded punch connected to it, mounted in straight guide blades of the knife head and equipped with a handle leading gear, interacting 15 by means at least one intermediate gear with a driven gear [1].

The known device allows to carry out without disassembling scissors, adjusting the height of the punch above the sheet to be machined, cutting chips and replacing a dull punch.

However, the presence of a special coupling 25 engaged in the engagement of the handle with the drive gear complicates the design of known devices.

The purpose of the invention is to simplify the design of the device. zo

This goal is achieved by the fact that the drive gear is internally engaged, mounted on the cutter head and axially spring loaded with the possibility of disengaging from the intermediate gear, and the handle is mounted directly on the drive gear.

In FIG. 1 shows a device for attaching a punch, a transverse section; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 - section BB in FIG. 1.

The proposed device includes a sleeve 1 with a threaded hole, rigidly connected to the driven gear 2. The sleeve 1 is mounted in the slider 3 of the scissors with the possibility of rotation about the axis of the slide and is connected by a thread to the punch 4 ,. moving in straight guides 5 and 6. On the knife head 7 of the scissors there is a leading gear 8 with internal gear engaging with the intermediate gear 9. The leading gear 8 is axially spring-loaded by springs 10 located in the grooves of the driving gear, equipped with a handle 11. On the knife. the head 757270 ke scissors reinforced stopper 12, which prevents the rotation of the handle 11 in one direction.

In the lower part of the knife head of the scissors there are matrices 13 and a guide 14 for chips, and in the upper part there is an adjustable stop 15, which plays the role of a sheet puller from the punch.

Before starting work, the punch 4 Stop, depending on the thickness of the metal sheet being processed, to the required rotation height of the pinion gear 8 using the handle 11. The rotation angle of the pinion gear 8 in the working state is limited by the stopper 12.

Then, the handle 11 is set 15 and the initial position for which the drive gear 8 is disengaged from the intermediate gear 9, the handle 11 is rotated all the way into the stopper 12, and the drive gear 8 is again engaged with the intermediate gear 9.

When the reciprocating movement of the slider 3, the punch 4, interacting with its side faces with the matrix 13, cuts through the processed sheet 16, and the chips are bent down into the groove of the guide 14.

If necessary, cut the chips, the operator using the handle 11 rotates the drive gear 8, which, in turn, through the intermediate gear 9, rotates the sleeve 1, forcing the punch 4 to unscrew.

If the full rotation of the handle 11 is not enough to cut off the chips, the operator moves the handle 11 with the drive gear 8 in the axial direction, disengaging the gear 8 from the engagement with the intermediate gear

9, rotates in the opposite direction to the starting position, engages the gears 8 and 9, and repeats the operations until the chips are completely cut off. After that, the operator, using the described manipulations in the reverse order, restores the height of the punch 4 to the processed ³ sheet.

To replace the dull punch 4, the operator, having previously removed the matrix 18 and the chip guide 14, unscrew the punch 4 from the sleeve 1.

The design of the proposed device can reduce the complexity in its manufacture and increases the reliability of the scissors in operation.

Claims (1)

Claim A device for attaching a punch of manual mechanized scissors, comprising 20 scissors mounted in the slider rotatably relative to the axis of the slider, a sleeve with a threaded hole rigidly connected to the driven gear, carrying a punch connected to it, installed in the straight guides of the knife head, and equipped with a handle leading a gear interacting by means of at least one intermediate gear with a driven gear, characterized in that in order to simplify the construction, the drive gear The gear is internally engaged, mounted on a knife head and axially spring loaded with a possibility of 35 disengaging from the intermediate gear, and the handle is fixed directly to the drive gear.