JPH048721B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spindle lift device for a measuring instrument such as a dial gauge or a linear gauge.

BACKGROUND ART A known example of this type is the one shown in FIG. 2, which is used in dial gauges, linear gauges, and the like.

In the figure, the lift device is a device for lifting a spindle 2 that is reciprocably supported on a housing 1. On the left side of the spindle 2, the lift device is rotatably supported on the housing 1 by a pin 4, and is supported by a spring 10. The lift arm 11 is constantly given a clockwise rotational force using the pin 4 as a fulcrum, and the tip of the lift arm 11 contacts the lift arm 11, and the lift arm 11 is rotated counterclockwise by protruding in the contact direction. It consists of an extrusion rod 5 made of a camera release, for example, and an engagement pin 12 protruding to the left with respect to the spindle 2. The lower surface of the engagement pin 12 and the tip of the lift arm 11 are brought into contact (the spindle 2 is constantly receiving downward pressing force from a spring (not shown)).

In this case, when the push rod 5 is projected, the lift arm 11 that comes into contact with it rotates counterclockwise against the pushing force of the spring 10, and at this time, the engagement pin 12 that comes into contact with the tip of the lift arm 11 An upward lifting force acts, and the spindle 2 integrated with the engagement pin 12 is lifted.

Hereinafter, in this state, after inserting the object to be measured between the tip of the spindle 2 (not shown) and, for example, a surface plate, the extrusion rod 5 is released from protruding, so that the tip of the spindle 2 comes into contact with the object to be measured. , the height of the object to be measured is determined from the position of the spindle 2 at that time.

Problems to be solved by the invention By the way, recently there are
Further miniaturization is required in order to avoid restrictions on the measurement location, and at the same time, there is a contradictory demand for expanding the measurement range, that is, increasing the stroke of the spindle. Along with this, the spindle lift device is also required to be small and have a large lift amount, but in conventional devices, the lift amount is limited by the distance between the fulcrum of the lift arm and the spindle contact point. It has been difficult to achieve both miniaturization and increased stroke.

Method for Solving the Problems The present invention provides the following advantages: without increasing the size of the lift arm;
It is designed to obtain almost twice the lift amount, and the spindle, which is reciprocatably supported on the casing, is engaged with a lift arm that is rotatably supported on the casing, and the extruder is brought into contact with the lift arm. In a spindle lift device that lifts the spindle by protruding a rod, a pulley is provided on a part of the lift arm, a wire is wound around the pulley, and the free end of the wire is connected to the opposite side of the spindle lift direction. It is characterized by being connected to the housing and the spindle lift.

Effect In the above case, when the extrusion rod is made to protrude,
As the lift arm rotates, the position of the pulley supported by it moves, and as a result, a lifting force is applied to the wire wound around the pulley. At this time, the wire on the movable side is the side connected to the spindle, and as the wire moves, the spindle is lifted. In this case, the wire will move twice as much as the amount of movement of the pulley position, and as a result, the spindle will be lifted twice as much as the amount of movement of the pulley position.

Embodiment In FIG. 1, the housing 1, spindle 2, pin 4, push rod 5, and spring 10, which are given the same numbers as in FIG. 2, are the same as in FIG. 2, and operate in the same manner. 3 is a lift arm, which is rotatably supported by the above-mentioned pin, and has a pulley 6 at its tip.
is provided. Wire 7 is attached to pulley 6
is wound around the upper half of the circumference, and both free ends are located below, one of which is connected to the housing 1 by a pin 9, and the other to the spindle 2 by a pin 8.

As a result, when the push rod 5 is pushed out, the lift arm 3 rotates counterclockwise about the pin 4, and the position (height) of the pulley 6 at its tip changes upward. As a result, an upward lifting force is applied to the wire 7, and the wire 7 on the side connected to the movable spindle 2 moves upward together with the spindle 2. At this time, the wire 7 moves twice as much as the pulley 6 moves (strictly speaking, it is not twice due to the difference between the moving direction of the pulley 6 and the moving direction of the wire 7, but approximately twice), and eventually the spindle 2 The amount of lift is increased.

In the above embodiment, the lift arm is placed on the left side of the spindle, but by using a long lift arm that passes through the back side of the spindle 2 and reaches the right side, the amount of lift can be further increased. be done.

Effects of the Invention As described above, the present invention utilizes the principle of a movable pulley to approximately double the lift amount of the spindle, and it is possible to increase the lift amount while maintaining a small size and to cover a large measurement range. A measuring instrument is obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention, and FIG. 2 is a sectional front view of a conventional one. 3: Lift arm, 5: Extrusion rod, 6: Pulley,
7: Wire.

Claims (1)

[Claims] 1. In a spindle lift device in which a spindle reciprocably supported on a housing is engaged with a lift arm rotatably supported on the housing, and the spindle is lifted by protrusion of an extrusion rod brought into contact with the lift arm. , a spindle lift characterized in that a pulley is provided in a part of the lift arm, a wire is wound around the pulley, and the free ends of the wire are connected to the casing and the spindle lift on the opposite side to the spindle lift direction. Device.