CN1883858A

CN1883858A - Novel screw tap

Info

Publication number: CN1883858A
Application number: CN 200510043903
Authority: CN
Inventors: 魏天战
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-23
Filing date: 2005-06-23
Publication date: 2006-12-27

Abstract

The invention discloses a new type threading awl, comprising a step-sheath type driving shaft, encasing a driven shaft with a united action pin via a warp bearing pawl and a fork locating collar. A restoring spring device is mounted on the driven shaft, which is consisted of spring, spring seat and pushing ball. The center of the bearing ball is fixed by the fork of the fork locating collar in this invention of threading device, using the adaption of the united action pin and the fastening slot and pawl of the driving shaft, rotation in same direction and reverse direction of the driving shaft and driven shaft is achieved, then screw-tap positive-rotation threading and automatic reverse-rotation workpiece releasing are accomplished. Advantages of this invention are: simple structure, convenient operation, fast threading speed, great applicability, etc.

Description

A kind of Two-end Tap Applied

Affiliated technical field

The present invention relates to the device of screw thread cutting, particularly adopt the automatically quick rotating screw tap of drilling machine manual operations thread mill drilling.

Background technology

At present, the screw thread on the processing small batch product has manual processing and machinery two kinds of methods of processing automatically.If adopt machinery processing automatically, then need complicated electrical equipment control mechanism or mechanical device, so the equipment investment expense be higher.Simultaneously, if do not adopt automatic feeding device and precision positioning jig, its process velocity is not high yet, also very easily produces card awl, disconnected awl phenomenon.The little handle screwdriver amount screwed hole of processing is generally taked manual method at present, its processing time consuming effort, inefficiency, processing cost height.

Summary of the invention

The purpose of this invention is to provide a kind of simple in structure, easy to operate, the automatic screw tap of rotating, it is applicable to the screw on manual operations processing small batch product on the drilling machine, to improve process velocity, cuts down finished cost.

The technical scheme that realizes the object of the invention is: a kind of Two-end Tap Applied, and it has a driving shaft that is step sleeve type, and interior setting-in one top has the driven shaft of set bar, and the middle part matched in clearance of this driven shaft is equipped with ratchet and shift fork positioning sleeve; Between ratchet and driving shaft, be provided with the bearing that inside and outside circle is respectively interference fit, the shift fork of shift fork positioning sleeve upper end stretches between the rolling element of bearing, the top of its positioning sleeve is provided with lock sleeve and driving shaft thread connection, the lateral fixation of positioning sleeve have backstay extend fixing slide carriage sliding tray in; On driven shaft, be provided with the back-moving spring mechanism that constitutes by spring, spring base and the decorative pearl on top of an official cap in its driving shaft.

Technical scheme of the present invention also comprises: be connected with at the lower end of driven shaft screw thread and adjust cover, be provided with the friction plate and the rubber cushion of center band tap holder patchhole in the cover.

The present invention compared with prior art has following advantage:

1, utilizes the movement relation of rolling bearing Internal and external cycle dexterously, made the rotating structure very simple, durable.

2, Internal and external cycle frictionally transmission, the size of its driving torque is relevant with the normal pressure that is applied between ball and the inside and outside circle, promptly exerts oneself when big as the operator, and the moment of torsion of transmission is big, and vice versa.Because this transmission allows servo system " to skid ", thereby the card awl that causes, disconnected awl phenomenon have been avoided reversing by force.

3, can use simple and easy drilling machine, not need complicated detent mechanism, make tapping simple to operate, can be bigger raise labour productivity, cut down finished cost.

Description of drawings

Fig. 1 is Two-end Tap Applied device overall structure figure;

Fig. 2 is the A-A profile of Fig. 1.

The specific embodiment

The present invention is further elaborated below in conjunction with drawings and Examples.

Provide as accompanying drawing 1, this Two-end Tap Applied device has the driving shaft (1) of establishing shoulder hole in one, and its endoporus bottom interference fit is installed ball bearing (8), and the interior interference fit of bearing (8) is installed ratchet (7).Driven shaft (5) is installed on the shaft core position of driving shaft, does matched in clearance with driving shaft top endoporus and ratchet axis hole.Set bar (6) has been crossed on the top of axle (5), and this set bar upwards can cooperate as shown in Figure 2 with the draw-in groove (16) on the driving shaft, makes driven shaft and driving shaft with turning to rotation; Can mesh with ratchet (7) downwards, driven shaft is rotated together with ratchet, in driving shaft (1) endoporus, be provided with spring (2), spring base (3) and the decorative pearl on top of an official cap (4) of pressuring action in the top of driven shaft (5).In the below of ratchet (7) and bearing (8) shift fork positioning sleeve (9) is installed with driven shaft (5) matched in clearance, the shift fork of its upper end stretches between the ball of bearing (8).The top of this positioning sleeve is provided with a lock sleeve (10) thread connection in the lower end of driving shaft (1) endoporus.Lateral fixation at positioning sleeve has a horizontal backstay (11), and the end of this backstay places in the vertical sliding tray of fixing slide carriage (12).

In accompanying drawing embodiment 1, provide one and had the dop structure of deciding moment of torsion and unsteady aligning function.It is to adjust cover (15) in the lower end thread connection one of driven shaft (5), adjust be provided with in the cover one with the friction plate (14) of axle (5) lower surface frictional fit, rubber cushion (13) is installed below the friction plate (14).Be provided with the tap holder patchhole at the center of friction plate and rubber cushion.By a rolling bearing socket,, make bearing enclose and ball constitute a planet circular system between driving shaft of this chasing bar and the driven shaft by the center fixation of shift fork with ball in the bearing.When rotated in the same way by driving shaft and drill press spindle the outer ring, bearing inner race drove by the frictional force of ball, does the rotation opposite with the outer ring.When the screw tap contact workpiece on the driven shaft, reaction force upwards pushes away driven shaft, and the bearing pin on the driven shaft is combined with driving shaft, and it is identical that driven shaft and driving shaft turn to, the beginning tapping; Driving shaft is upwards carried when tapping is finished, and spring presses driven shaft to contact with the ratchet of counter-rotating, and workpiece is withdrawed from the screw tap counter-rotating.The feed compensation of the screw tap friction-type chuck that keeps to the side provides.

The method of operating of this device is: 1, SBR.Drilling machine is started, and driving shaft is rotated in the forward, and driven shaft is done reverse rotation; 2, duty.Drill press spindle moves downward, and screw tap contact workpiece, driven shaft are rotated in the forward and carry out tapping; 3, end-of-job.Carry on the drill press spindle, screw tap is return in the driven shaft counter-rotating, enters next work period.

Claims

1, a kind of Two-end Tap Applied is characterized in that: it has the driving shaft (1) of a journey step sleeve type, and interior setting-in one top has the driven shaft (5) of set bar (6), and the middle part matched in clearance of axle (5) is equipped with ratchet (7) and shift fork positioning sleeve (9); Between ratchet (7) and driving shaft (1), be provided with the bearing (8) that inside and outside circle is respectively interference fit; The shift fork of shift fork positioning sleeve (9) upper end stretches between the rolling element of bearing (8), and the top of its positioning sleeve is provided with lock sleeve (10) and driving shaft (1) thread connection, and the lateral fixation of positioning sleeve has backstay (11) to extend in the sliding tray of fixing slide carriage (12); On driven shaft (5), be provided with the back-moving spring mechanism that constitutes by spring (2), spring base (3) and the decorative pearl on top of an official cap (4) in its driving shaft (1).

2, a kind of Two-end Tap Applied according to claim 1 is characterized in that: the lower end screw thread at driven shaft (5) is connected with adjustment cover (15), is provided with the friction plate (14) and the rubber cushion (13) of center band tap holder patchhole in this adjustment cover.