JPH0311520U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a longitudinal section of the main part of a tapping machine incorporating the torque detection device of the present invention, Figures 2 and 3 are principle diagrams of the present invention, Figure 4 is a timing chart, and Figure 5 is a block circuit. 6 are explanatory diagrams showing the prior art. In the figure, 2 is a main shaft, 7 is a spindle sleeve, 13 is an elastic body, 15 is a main shaft insertion member, 17 and 18 are detectors, 20 is an identification part, 21 is an exclusive OR, 22 and 23 are timer counters, 24
25 is an external input device, and 26 is a comparison/judgment circuit.

Claims (1)

[Claims for Utility Model Registration] 1. An elastic body is provided on the outer periphery of the lower end of the spindle sleeve which is supported by the head and rotationally driven,
In a tapping machine in which a screw tap is rotationally driven through this elastic body, an identification portion is provided on the outer peripheral surface of the elastic body within a range of a center angle θ, and a detector is provided to detect the presence or absence of this identification portion. Two pieces are arranged at a distance L apart from each other in the axial direction of the elastic body,
The torsion angle P generated in the elastic body is sensed from the period to and the phase difference tx of the output signals of these two detectors, and the load torque T applied to the screw tap is calculated, and the load torque T is calculated from the input from the operation switch etc. The allowable maximum torque value TM of the tap is determined in advance according to the size, type, workpiece material, etc. of the specified tap, and the load torque T and the allowable maximum torque value T are determined in advance.
A load torque detection device for a tapping machine, characterized in that it has an arithmetic processing unit that compares the magnitude with M, and is capable of detecting the occurrence of excessive load torque applied to a tap during tapping. 2 The center angle θ of the identification part made on the outer periphery of the elastic body has a relationship that is 360 degrees divided by 2·n (n is an integer value), and
By providing the identification parts of the book with an interval of center angle θ, it is possible to
A load torque detection device for a tapping machine according to claim 1, which is capable of performing multiple load torque detections. 3 The value of the center angle θ is the allowable maximum torque value Tm of the tap that can be used when attached to the tapping board.
ax. The torsion angle P of the elastic body corresponding to is Pma
The load torque detecting device for a tapping board according to claim 1 or 2, wherein when Pmax and the center angle θ have a relationship of Pmax<θ.