JPS639395Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a loading arm device for supplying and unloading workpieces to and from a machine. 2. Description of the Related Art An arm-type loading device that rotates at a predetermined angle while holding the inner diameter or outer diameter of a ring-shaped workpiece is known.
(For example, see Utility Model Registration No. 951229). However, in the conventional type, a rod-shaped or ring-shaped work holding member is loosely fitted onto the inner or outer diameter of a ring-shaped workpiece and the workpiece is rotated as it is. In extreme cases, the machined surface of the workpiece collides with the shoe used to center and support the workpiece during machining, causing undesirable phenomena such as dents and noise.

In the first place, the conditions that must be met for an automatic loading device are (a) stable operation;

(b) The positioning of the workpiece must be accurate.

(c) Short cycle time. (High turning speed).

(d) The work should land softly on the shoe without colliding with the shoe for centering and supporting the work.

(e) During machining, there must be absolutely no interference between the workpiece and the loading arm (especially the holding part).

However, the above conventional methods do not necessarily satisfy these conditions, especially the above conditions.
There were structural problems with (d) and (e) soft landing and interference between the workpiece and the arm.

The present invention was devised to solve these problems.The loading arm, which was conventionally integrated, is made into two halves, left and right, which are pivotally supported and work together to grasp the workpiece. hold it,
The gripping state is relaxed at the second rotational position by means of a hydraulic cylinder means.

Referring to the drawings below, reference numeral 1 indicates the loading arm assembly of the present invention, and reference numeral 3 indicates the loading arm assembly of the present invention.
5 is a second stopper assembly. The reference numeral 71 is the face plate of the workpiece spindle, 7
2, 73 is a shoe, and the workpiece is placed on the face plate 7.
magnetically held on the front surface of 1 and the shoe 72,
The workpiece is centered and supported at 73, and the inner diameter of the workpiece is ground. Of course, well-known machine tools for machining the outer diameter of the workpiece are also not shown, but
It will be understood from the following explanation that the present invention can be applied.

Now, as shown in detail in FIG. 1, the loading arm assembly 1 includes left and right half members 12, 13.
These two half members 12, 13 are connected to a pivot 14.
are mutually supported. A connecting rod 15 and a spring 1 connecting the two half members 12 and 13 are provided in the middle part.
6 are set as shown, both half members 1
The workpiece gripping parts 17 and 18 of 2 and 13 are made to have a reduced diameter relative to the workpiece W so that the outer diameter of the workpiece W can be gripped.

Each of the half members 12 and 13 is provided with a pin 19 so as to abut a pin 8 implanted in a rotating member (not shown). That is, when the not-illustrated pivoting member pivots up and down about the axis of the pivot shaft 14, the loading arm assembly 1 is pivoted by the pins 8 and 19.

Reference numerals 20 and 21 indicate stopper members provided on the half members 12 and 13 so as to abut the first and second stoppers 3 and 5 at the first and second rotational positions, respectively.

Now, FIG. 2 shows a state in which the loading arm assembly 1 is rotated to the first rotation position for supplying and unloading workpieces to the machine, and shows the left half of the loading arm. The stopper member 20 provided on the member 12 is in contact with a stopper chip 31 buried in the first stopper 3,
Therefore, the work gripping portion 17 of the half member 12 is slightly opened downward as shown in the figure. Therefore, since the space formed by the cooperation of the gripping parts 17 and 18 of the left and right half members 12 and 13 is larger in diameter than the outer diameter of the workpiece W, the workpiece W can be freely fed into the space. , it is also possible to carry it out.

Also shown in FIG. 3 is that the loading arm assembly 1, which has received the unprocessed workpiece at the first rotational position, rotates to the lower right of FIG. 2 to process the workpiece. This shows a state in which the vehicle has been turned to a second turning position.

In this position, the outer diameter of the workpiece W contacts and is supported by the shoes 72 and 73, but a moment before the workpiece W contacts the shoes 72 and 73, the stopper chip 53 at the tip of the piston 51 provided on the stopper 5 comes into contact with the stopper of the right half member 13. The half member 13 comes into contact with the member 21, and the engagement between the tip gripping portion 18 of the half member 13 and the workpiece is slightly loosened. Therefore, the workpiece W makes a soft landing on the shoes 72 and 73, and is then magnetically chucked by the face plate 71.

However, even after this, the loading arm assembly 1 continues to rotate slightly (angle α). Accordingly, the grip portion 17 of the left half member 12 is in a state away from the outer diameter of the workpiece W as shown in the figure. Furthermore, at this time, by simultaneously flowing fluid into the cylinder chamber 52 of the stopper 5, the gripping portion 18 of the right half member 13 is further expanded, so that the workpiece W being processed is held by the loading arm assembly 1. There will be no fear of interference.

As is clear from the above explanation, the present invention is a new and progressive loading arm device that satisfies all of the conditions (a) to (e) above, and is particularly suitable for handling large quantities of ring-shaped workpieces. Moreover, the efficiency of precision machining is dramatically improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the loading arm device of the present invention adapted to an internal diameter shoe grinder, and FIG. 1 shows the overall layout, and in particular, shows the configuration of the loading arm assembly. , second
The figure shows the state of diameter expansion at the first turning position, and FIG. 3 shows the state at the second turning position. Explanation of symbols: 1... Loading arm assembly, 3... First stopper assembly, 5... Second stopper assembly, 8... Pin, 12... Left half member of loading arm, 13 ... Right half member of loading arm, 14 ... Pivot, 15 ... Connecting rod, 16 ... Spring, 51 ... Piston, 72, 7
3...Show.

Claims (1)

[Scope of utility model registration request] A loading arm that rotates back and forth while holding a workpiece between a first rotational position for supplying and unloading a workpiece to a machine tool and a second rotational position for processing the workpiece. In the device,
Two loading arm half members pivotally supported to each other at the pivot axis, a resilient member set across both of the two loading arm half members, and a resilient force of the resilient member. The tip portions of the loading arm halves cooperate with each other to expand or contract in diameter to grip the workpiece, and while the workpiece is gripped in this manner, the first and second half members
It consists of a turning means configured to swing back and forth between turning positions, and two stopper means for loosening the grip on the work by abutting and pressing the loading arm half members at both turning positions, respectively, A loading arm device characterized in that a fluid pressure cylinder means is incorporated in the stopper means at the second rotation position.