CN2069343U

CN2069343U - Hollow drill

Info

Publication number: CN2069343U
Application number: CN 90214394
Authority: CN
Inventors: 刘鹤年
Original assignee: STATE CHANGSHU TELECOMMUNICATION APPARATUS FACTORY
Current assignee: STATE CHANGSHU TELECOMMUNICATION APPARATUS FACTORY
Priority date: 1990-07-28
Filing date: 1990-07-28
Publication date: 1991-01-16

Abstract

The utility model discloses a hollow drill which can perforate on the stacked paper. The hollow drill is characterized in that inner chip removing holes are respectively arranged in the drill bit (1), the drill rod (2) and the drill rod (3) of the hollow drill. The end face of the drill bit (1) is opened with a cutting edge with the distribution of 360 DEG. An electrical machine drives the hollow drill to cut the next circular-shaped paper sheet which can upward move in line in the inner chip removing holes of the hollow drill. Compared with the existing perforating technique, the hollow drill has the advantages of easy operation, labor saving, high efficiency of bookbinding, big thickness of bookbinding and no phenomena of chip flying and gap.

Description

Hollow drill

The utility model relates to the core drill of using on a kind of sheet binding puncher.

At present, the page punching is mainly with punching type punching and fluted drill drilling, and the former installs a draw point quires is holed on the sheet binding puncher, and its shortcoming is to bore the thin hole of quires, when quires thickness reaches papery greatly when hard, draw point is flexible even fracture; Drill bit was easily blunt when the latter holed, and increased resistance with dull bit drilling meeting, blue or green cigarette often occurred emitting and the yellow phenomenon of burning.Two kinds of boring bar tools that more than exemplify all do not have interior chip-removal hole, thus when boring paper scrap wave everywhere, influence environmental sanitation; And the hole shape that gets out is rounding not, and the limit, hole is recessed sticks up, and near the quires end hole time, very easily occurs chipping phenomenon, influences bookbinding quality.

The purpose of this utility model provide a kind of hole hole shape rounding of beating when page is punched, cutting thickness big, do not have chip and tool in the core drill of chip-removal hole.

The core drill that the utility model provides is made up of the drill bit that fuses (1), drilling rod (2) and drilling rod (3) as shown in drawings, have the cutting edge that is 360 ° of distributions on the end face of drill bit (1), on drill bit (1), drilling rod (2) and drilling rod (3), respectively be provided with the interior chip-removal hole in different apertures.

Below in conjunction with accompanying drawing the utility model is further described.

Accompanying drawing is the utility model core drill profile.

A kind of core drill of forming by the drill bit that fuses (1), drilling rod (2) and drilling rod (3), respectively be provided with chip-removal hole in it, the endoporus hole wall is bright and clean, the aperture of drilling rod (3) is bigger than drilling rod (2), the aperture of drilling rod (2) is bigger than the aperture of drill bit (1), make the scraps of paper under the cutting can not block in the hole of core drill, on the end face of drill bit (1), have the cutting edge that is 360 ° of distributions, cutting basil α=2 °～10 °, the aperture of the interior chip-removal hole on drill bit (1), drilling rod (2), the drilling rod (3) increases successively slightly.The length of drill bit (1) is excellent with weak point under the condition of the strength and stiffness that guarantee core drill, the equal diameters of the circular paper under its aperture and the cutting; The length of drilling rod (2) is determined according to the thickness that need bore quires, the endoporus aperture is under the strength and stiffness that guarantee core drill require, be the bigger the better, and the external diameter of drilling rod (2) with need to beat aperture, paper hole and equate, drilling rod (3) is installed on the sheet binding puncher collet, and the installing hole of length and external diameter and collet matches.The endoporus aperture is greater than the endoporus aperture of drilling rod (2), when the core drill of rotation moves down, the cutting edge of drill bit (1) is tight with letterweight, cut circular paper one by one then, cutting circular paper down produces a restoring force that makes progress, thus make under driven by motor core drill continuously the circular paper under the cutting through drill bit (1) endoporus, upwards rank along the endoporus of drilling rod (2), drilling rod (3).

The hole that the core drill that the utility model provides is beaten, hole shape rounding, no flying chip and gap phenomenon, cutting thickness is big, places the rubber pad in the quires bottom during cutting, makes that be convinced in the paper hole that cuts out, no flange, has improved bookbinding quality.

Embodiment

The length 2mm of drill bit (1), aperture φ 4.9mm, the cutting basil is 4 °, the endoporus aperture of drilling rod (2), drilling rod (3) is respectively φ 5mm, φ 5.3mm.

Claims

1, a kind of core drill is made up of drill bit (1), drilling rod (2) and drilling rod (3), it is characterized in that having on the end face of drill bit (1) cutting edge that is 360 ° of distributions; On drill bit (1), drilling rod (2) and drilling rod (3), respectively be provided with the interior chip-removal hole in different apertures.

2, core drill according to claim 1 is characterized in that the cutting edge angle is α=2 °～10 °.

3, core drill according to claim 1 is characterized in that the aperture of the interior chip-removal hole on drill bit (1), drilling rod (2), the drilling rod (3) increases successively slightly.