JPH04130805U - Saw wheel drive belt tensioning device for band saw machine - Google Patents

Abstract

(57) [Summary] [Purpose] The movement of the bolt of a belt tensioning device is divided into the range due to the rotation of the screw part and the range due to sliding movement, reducing the amount of work required to move the bolt, thereby reducing the amount of labor required by the operator. The goal is to reduce [Structure] Range in which tension can be applied to the saw wheel drive belt 6 by moving the motor 2 by hand using the outer diameter portion 17 of the tip of the bolt 15 of the belt tensioning device provided on the side of the motor 2 (dimension E in the figure) is made smaller in diameter than the root diameter of the female threaded portion 13 of the tensioner stay 12, so that the bolt 15 can move quickly.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is applicable to band saw machines that use belts and pulleys as the power transmission device to the saw wheel. This invention relates to a saw wheel drive belt tensioning device in a saw wheel drive belt.

0002

[Conventional technology]

The prior art will be explained using FIGS. 6 and 7. In the figure, a long hole provided at the bottom of the band saw frame 20 is used as a guide for the motor. The motor 21 moves in the direction of arrow A and is fixed at any position with the motor fixing bolt 22. It will be done. The drive pulley 23 fixed to the shaft of the motor 21 and the saw axle 24 for the bandsaw blade A saw wheel drive belt 26 is stretched between the fixed driven pulleys 25. On the side of the motor 21, on the side where the saw wheel drive belt is loosened, there is a band saw frame. A tensioner stay 27 having a female threaded portion is installed upright at 20, and the axis of the threaded portion is aligned with the motor. This coincides with the direction of movement of the lever 21 (direction A). Female thread part of tensioner stay 27 A bolt 28 is screwed into the bolt 28, and the motor 21 that rotates the bolt 28 is rotated in the direction of arrow B. to apply tension to the saw wheel drive belt 26.

0003

[Problem that the idea aims to solve]

In the belt tensioning device described above, when replacing the saw wheel drive belt 26, the motor Loosen the torque fixing bolt 22 and rotate the bolt 28 to move it in the direction C. The torque 21 also moves in the C direction. As a result, the driven pulley 25 and the driving pulley 23 becomes shorter, the saw wheel drive belt 26 becomes loose, causing the saw wheel drive belt 26 to become loose. Can be removed. However, when the saw wheel drive belt 26 is a V-shaped belt, the V-shaped belt provided on the pulley The motor 21 must be moved in the C direction an additional distance corresponding to the depth of the groove. In addition, in order to apply appropriate tension to the saw wheel drive belt 26, the bolt 28 is threaded. The distance where force is required (I in Figure 6) is the motor 21 required when replacing the belt. This is less than half the amount of movement (H+I in FIG. 6). This motor 21 It is not necessary for the belt replacement worker to perform the travel distance (H + I) by screw fitting the entire area. It was a tedious task. The purpose of this invention is to reduce the amount of work needed to move the bolts of the belt tensioning device to the minimum necessary. By doing so, the effort of the worker is reduced.

0004

[Means to solve the problem]

The above objective is the range of bolt movement distance (H + I) required for belt replacement work. ), the range in which tension can be applied to the saw wheel drive belt by moving the motor by hand (H) In order to prevent the tensioner stay and bolt from screwing together, the outer diameter of the tip of the bolt should be adjusted. This is achieved by making the diameter smaller than the inner diameter of the threaded portion of the tensioner stem.

[0005]

[Effect]

The belt tensioning device configured as described above is necessary for replacing the saw wheel drive belt. Of the required motor movement range (H+I), the range where the operator can push the motor by hand. In (H), the bolt slides in the direction of arrow A and applies tension to the saw wheel drive belt. , the range (I) where thrust is required due to the screw structure of the bolt is between the tensioner stay and the bolt. The saw wheel drive belt is threaded to provide tension to the saw wheel drive belt.

[0006]

【Example】

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the figure, use the elongated hole provided at the bottom of the band saw frame 1 as a guide in the direction of arrow A. It is movable and at the same time is arranged so that it can be fixed in any position with the motor fixing bolt 18. The driving pulley 3 is fixed to the output shaft of the motor 2. The driven pulley 4 is fixed to one end of the saw axle 5 for the band saw blade, which is pivotally supported on the band saw frame 1. The drive pulley 3 and the saw wheel drive belt 6 connect the saw wheel. Saw axle 5 for band saw blade A saw wheel 7 for a driving band saw blade is fixed to the other end. A saw wheel 8 for a driven band saw blade is pivotally supported on the upper part of the band saw frame 1, and a saw wheel 8 for a driven band saw blade is pivotally supported. An endless band saw blade 9 that can be circulated is stretched between the wheel 7 and the saw wheel 8 for the driven band saw blade. . In addition, a table 11 for placing cutting material 10 is placed horizontally on the band saw frame 1. It is arranged above the saw wheel 7 for the drive band saw blade. A belt tensioning device that applies tension to the saw wheel drive belt 6 connects the driven pulley 4 to the bandsaw machine. In order to have the frame 1 support the shaft in a fixed position, move the drive pulley 3 and motor 2 to arrow B. In order to move the saw wheel in the direction and give the appropriate tension, the saw wheel drive belt is attached to the side of motor 2. Arranged on the loose side of 6. The belt tensioning device consists of a tensioner stay 12 erected on the band saw frame 1 and a belt tensioner. Because the shaft center is in the same direction as the moving direction of the motor 2 provided on the tensioner stay 12, a bolt 15 having a threaded portion 13 and a male threaded portion 14 screwed into the female threaded portion 13; A motor base stay 16 that moves the motor 2 by the tip of the bolt 15 It consists of The bolt 15 has a male threaded portion 14 that screws into the tensioner stay 12, and a tensioner. Consisting of a retainer stay 12, an outer diameter portion 17 having a smaller diameter than the root diameter of the female thread portion 13, The range in which the outer diameter portion 17, which has a smaller diameter than the root diameter of the same portion 13, engages with the tensioner stay 12 (Fig. (dimension E), the bolt 15 moves in the direction of arrow A without rotating, and the tension The range where the Shona stay 12 and the male threaded portion 14 of the bolt 15 engage is (dimension F in the figure) , rotate the bolt 15 and move the bolt 15 in the direction of arrow A to apply tension to the belt. give.

[0007]

[Effect of the idea]

According to the present invention, a belt tensioning device is required when replacing a power transmission belt, etc. The area where the bolt requires thrust due to the screw structure is screwed, and the area where it is not required is screwed. The sliding structure allows the bolt to be moved quickly, improving work efficiency when replacing the belt. can do.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view with the tensioning device activated and the saw wheel drive belt loosened.

3 is an enlarged view of section G including a partial cross section of FIG. 1. FIG.

FIG. 4 is an overall front view of the bandsaw machine.

FIG. 5 is a left side view of FIG. 4.

FIG. 6 is a front view showing an example of the prior art.

FIG. 7 is a front view with the tensioning device activated and the saw wheel drive belt loosened.

[Explanation of symbols]

1 is a band saw frame, 2 is a motor, 3 is a driving pulley, 4 is a driven pulley, 6 is a saw wheel drive belt, 12 is a tensioner stay, 13 is a female threaded portion, 14 is a male threaded portion, 1
5 is a bolt, 16 is a motor base stay, and 17 is an outer diameter portion.

Claims (1)

[Scope of utility model registration request] Claim 1: A saw wheel driving motor is disposed at the bottom of a band saw frame so as to be slidable and fixed at the same time, a driving side pulley fixed to the shaft of the motor and a driven side fixed to the saw axle for the band saw blade. In a band saw machine, the pulleys are connected by a saw wheel drive belt, a bolt is arranged on the band saw frame on the side of the motor, and the motor is moved by the threaded thrust of the bolt to apply tension to the saw wheel drive belt, A saw wheel drive belt tensioning device for a band saw machine, characterized in that a part of the outer diameter portion of the tip of the bolt is made smaller than the inner diameter of a female thread into which the bolt is screwed.