JPS6125825Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotating arm rod drive device for a batting machine used for baseball batting practice.

Conventionally, batting machines are known that use a small single-phase AC motor that can be easily connected to a general electric light line power source. The drive causes the rotary arm to rotate against the interposed tension coil spring, and the energy stored by the tension of the spring is released to cause the rotary arm to swing strongly, causing the tip of the rotary arm to swing. The structure is such that a ball supported by a ball supporter is thrown, and a structure for rotating the rotating arm rod by a motor against a tension coil spring is rotated by the rotating shaft. A freely fitted chain gear is rotated by a motor via a speed reducer or the like, and a protrusion protruding from the front of the chain gear presses the base of the rotating arm rod to drive the rotating arm. Ta. Therefore, it is natural that a strong driving force is required for the protrusion of the chain gear to push and rotate the rotating arm rod against the strong tension coil spring. However, recently there has been a demand for balls to be thrown at speeds of over 130km/h, and the tension coil springs that provide the energy source for the throwing force are also required to have strong springs. Since a single-phase small motor is used as power, a motor with more than 1 horsepower cannot be used, and if the tension coil spring is made too strong, the rotating arm rod cannot be driven to rotate. There is a natural limit to the strength of the tension coil spring, and with conventional batting machines, it was impossible to throw a ball at a speed of over 130km/h. Furthermore, the conventional rotary arm rod drive mechanism has disadvantages in that an unreasonable and severe load is applied to the rotation mechanism, power transmission mechanism, etc., making it easy to break or malfunction.

In view of the above, this invention was developed with the objective of providing a rotary arm rod drive device as described below to eliminate the various drawbacks of the prior art.

To explain the device of this invention in detail with reference to the embodiments shown in the drawings, reference numeral 2 denotes a rotating shaft in the front and rear direction rotatably installed on the frame 1 by bearings 3, 3;
An elongated rotary arm rod 4 having a ball support 5 at its tip is fixed to its front end, and a brake wheel 6 is fixed to its rear end. The reference numeral 7 designates a band that is wound around the brake wheel 6. Reference numeral 8 denotes an eccentric shaft protruding from the eccentric position of the brake wheel 6, to which a locking piece 9 is attached. A tension coil spring 10 of an appropriate strength is tensioned and interposed with its upper end being engaged with the above-mentioned engagement piece 9 and its lower end being engaged with a engagement piece 11 provided at the lower part of the frame 1, respectively. When the rotary arm rod 4 is braked and stopped at the solid line position as shown in Figures 1 and 2, the eccentric shaft 8 is at the lowest position (bottom dead center), and the tension coil spring 10 is at the lowest position. It is stretched vertically in a reduced state. 12 is a chain gear rotatably fitted on the rotating shaft 2 located close to the rear of the part where the rotating arm rod 4 is fixed; 13 is a motor installed at the bottom of the frame 1; is directly connected to. 1
6 is a chain wheel fixed to the output shaft 15 of the reducer 14;
Reference numeral 17 denotes an intermediate shaft supported on the frame 1 by a bearing 18, to which chain wheels 19 and 20 are fixed, respectively. A control chain 21 is connected between the chain wheels 16 and 19, and a control chain 22 is connected between the chain wheels 12 and 20, respectively. Reference numeral 23 designates an elongated drive arm rod having a curved tip bent portion 23a at its tip, and the drive arm rod 23 has its base end fixed to the outer peripheral edge of the front surface of the chain gear 12 and protrudes radially outward. has been done. and the drive arm 2
3 rotates with the rotation of the chain gear 12, and the rotating arm rod 4
It is designed so that it can be rotated by pushing the tip. Reference numeral 24 denotes a supply gutter that sequentially supplies balls 26 from a ball storage tank (not shown) on the frame 1, and a ball receiver 25 provided at the tip thereof.
The first balls 26 are sequentially placed on the balls 26, and are successively thrown by the rotary arm rod 4, as will be explained below.

Next, the operating state will be explained with reference to the drawings. When the motor 13 is now rotated, the chain gear 12 rotates at a low speed in the direction of the arrow through the reducer 14 and the adjustment transmission mechanism, and the drive arm is rotated accordingly. The rod 23 rotates in the direction of the arrow from the solid line position in FIG. (At this time, as the brake wheel 6 rotates, the eccentric shaft 8 sequentially rotates upward from the bottom dead center position, so the tension coil spring 10 is sequentially tensed.) ) First, when the driving arm rod 23 comes to the position shown by the chain line B and the rotating arm rod 4 comes to the almost horizontal position shown by the chain line (a), the ball support 5 at the tip
supports the ball 26 on the ball receiver 25 at the tip of the ball supply gutter 24 by scooping it up. Then, when the driving arm rod 23 further rotates and comes to the position shown by the chain line C, and the rotating arm rod 4 is rotated to the position shown by the chain line (b), the eccentric shaft 8 reaches the top dead center, and the tension coil spring 10
is in the most tensioned state as shown by the chain line in Figure 2. Then, when the rotating arm lever 4 passes the position indicated by the chain line (b), the energy stored by the tension of the tension coil spring 10 is released at once, and the rotating arm lever 4
The ball 26 on the ball support 5 is thrown at high speed by rotating and swinging in the direction of the arrow with strong force and high speed. The rotary arm rod 4, which has been rotated and swung with the above-mentioned strong force, is braked by the brake wheel 6 at the first solid line position and stops again. Then, the drive arm 23, which rotates at a low speed sequentially as the chain gear 12 rotates, returns to the chain line A position and pushes the rotary arm 4 again to drive the rotation, and the operation is repeated. It is something.

In the rotating arm rod drive device of this invention, as described above, the motor 13 is rotatably fitted on the rotating shaft 2.
The chain gear 12 is driven by a chain gear 12, and a long drive arm 23 that can push the tip of the rotary arm 4 to drive the rotary arm 4 is integrally protruded. The point of action of the driving force of the drive arm 23 to rotate the rod 4 around the rotation axis 2 is the tip of the rotation arm 4, and the length from the rotation axis 2 to the line of action is long. The above driving force acts, that is, as in the conventional case, the rotating arm rod 4 is
Unlike the case where the rotating arm rod 4 is rotated by applying a driving force to its base, the rotating arm rod 4 can be rotated with a small driving force, and therefore even if the spring strength of the tension coil spring 10 is increased. The rotary arm rod 4 can be rotationally driven by the same motor 13.
It has the outstanding effect of being able to throw a ball at a high speed of over 130km/h, which was previously impossible, by using a horsepower motor 13. In addition, as mentioned above, since the driving force acts on the rotating arm rod 4 as a moment with a long distance from the rotating shaft 2 to the line of action, no unreasonable resistance load is applied to each rotating mechanism or transmission mechanism. It is reasonable and has an excellent effect that does not cause any malfunctions.

[Brief explanation of the drawing]

The drawings show an embodiment of this invented device, with FIG. 1 being a front view and FIG. 2 being a rear view. 1... Frame, 2... Rotating shaft, 3... Bearing,
4... Rotating arm rod, 5... Ball support, 6... Braking wheel, 7... Band, 8... Eccentric shaft, 9... Locking piece, 10... Tension coil spring, 11... ...locking piece, 12...chain gear, 13...motor, 14...
...Reduction gear, 15...Output shaft, 16...Chain gear, 1
7... Intermediate shaft, 18... Bearing, 19, 20... Chain gear, 21, 22... Adjustment chain, 23... Drive arm rod,
23a...Tip bent part, 24...Ball supply gutter,
25...Ball reception, 26...Ball.

Claims (1)

[Scope of utility model registration request] A rotating arm rod 4 fixed to a rotating shaft 2 installed on the frame 1 is driven by a motor 13 to rotate against an interposed tension coil spring 10, and the tension of the spring at that time causes storage. In this batting machine, the rotary arm rod 4 is strongly rotated and swung by releasing the energy, and the ball supported by the ball supporter 5 at the tip of the batting machine is thrown. A long driving arm rod 23 that can push the tip of the rotary arm rod 4 to rotate it is integrally provided on the chain gear 12 which is rotatably fitted and driven by a motor 13. Rotating arm rod drive device for batting machines.