JPS6234025A - Torque detection mechanism - Google Patents

Abstract

PURPOSE:To make it possible to accurately detect torque, by a method wherein an outer shaft and an inner shaft are integrally rotated by a cam follower and a cam groove and, at the same time, the torques thereof are converted to thrusts to be detected by a load detector. CONSTITUTION:When the drive shaft of a motor is rotationally driven, driving torque is transmitted to an outer shaft 2 by a timing belt and a belt 8 and the outer shaft 2 is guide by the roll bearing 3 of a take-up arm 1 to be rotated around its axis. Further, the wall surface of a cam groove 17 is contacted with a cam follower 10 to transmit the torque of the outer shaft 2 to an inner shaft 4 and the outer shaft 2 and the inner shaft 4 having a load detector 19 provided to one end side thereof are integrally rotated. The torque detected by the load detector 19 is transmitted to a take-up shaft by the gear 9 of the inner shaft 4 and a take-up roll and the take-up shaft are integrally rotated. As a result, the torque of the take-up shaft is accurately detected and the tension of a continuous web can be accurately regulated.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a torque detection mechanism.

Structures of conventional examples and their problems For example, a slitter that shreds a continuous web such as paper into a plurality of strips and winds them onto a take-up roll is generally used. Generally, a slitter has a winding shaft and a winding arm, and the winding shaft is supported at the tip of the winding arm and is transmission connected to a rotational drive system such as a drive shaft or a transmission shaft. Therefore, when the take-up roll is attached to the take-up shaft, the take-up roll and the take-up shaft are rotated together, and the continuous web can be wound onto the take-up roll.

By the way, for this type of slitter, the most important thing is the tension of the continuous web. In order to accurately wind a continuous web, it is necessary to apply a predetermined tension to the continuous web and to prevent the tension from fluctuating. Furthermore, it may be necessary to increase or decrease the tension of the continuous web depending on the winding diameter of the take-up roll.

To achieve this, the torque of the drive system is detected as the torque of the winding shaft. Then, this may be feedback-controlled by a feedback control mechanism. As is well known, increasing or decreasing the torque of the winding shaft
The tension in the continuous web increases or decreases accordingly.

Therefore, by feedback controlling the torque of the winding shaft, the tension of the continuous web can be adjusted as desired.

However, conventional mechanisms for detecting the torque of the winding shaft have had problems. Up to now, several torque detection mechanisms have been developed, but all of them have a 101 configuration and cannot be made compact. For this reason, even though it is possible to detect the torque of the drive system at a location away from the take-up shaft, it is not possible to incorporate a torque detection mechanism close to the take-up shaft; Drive system torque cannot be detected. Therefore, the torque of the winding shaft could not be detected accurately, and the tension of the continuous web could not be accurately adjusted. Therefore, there was a demand for the development of a torque detection mechanism that could be installed close to the take-up shaft.In order to install it close to the take-up shaft, there was a need to develop a torque detection mechanism that could accurately detect torque with a simple configuration. There is a need to.

Purpose of the Invention Accordingly, the present invention has been made with the object of accurately detecting torque with a simple configuration.

Structure of the Invention In the present invention, an inner shaft is inserted into a rotatably supported cylindrical outer shaft, and the outer shaft and the inner shaft are arranged in a concentric double-shaft configuration. A rolling bearing is provided between the inner peripheral surface of the outer shaft and the outer peripheral surface of the inner shaft, and the inner shaft is guided so as to be rotatable and displaceable in the axial direction relative to the outer shaft.

Furthermore, a cylindrical cam follower is fitted onto a fixed pin extending in the radial direction from the inner shaft, a rolling bearing is provided between the inner peripheral surface of the cam follower and the outer peripheral surface of the pin, and the cam follower is rotatably guided around the pin. . Then, this cam follower is inserted into a cam groove formed on the outer shaft, and the wall surface of the cam groove is inclined at a constant angle in the rotational direction as it goes in the axial direction of the outer shaft. Furthermore, a load detector is provided on one end side of the inner shaft, and the load detector is configured to receive the thrust of the inner shaft. The outer shaft and inner shaft are rotated integrally by the cam follower and cam groove, and at the same time, the torque is converted into thrust, and the torque of the outer shaft and inner shaft is detected by a load detector. It is something to do.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

In the figure, this mechanism is for rotationally driving the take-up roll and take-up shaft of the slitter.

The take-up shaft is supported at the tip of the take-up arm (1).

This mechanism has a cylindrical outer shaft (2), which is installed near the winding shaft, and the outer shaft (2) is supported by a rolling bearing (3) of the winding arm (1) and is rotatable. , and is guided so as not to be displaced in the axial direction. Furthermore, the inner shaft (4
) is inserted into the outer shaft (2), and the outer shaft (2) and inner shaft (4)
are arranged in the form of concentric double shafts.

A rolling bearing (5) is provided between the inner peripheral surface of the outer shaft (2) and the outer peripheral surface of the inner shaft (4), so that the inner shaft (4) can rotate with respect to the outer shaft (2), and It is guided so that it can be displaced in the direction. Bearing (5) has many balls (6)
The ball (6) is a ball type consisting of a sleeve (
7), and the inner peripheral surface of the outer shaft (2) and the inner sleeve (
4) is arranged between the outer circumferential surfaces of.

In addition, the outer shaft (2) and the inner shaft (4> are arranged parallel to the drive shaft of the motor and the winding shaft of the winding arm (1).A timing pulley (8) is attached to the outer shaft (2). A timing belt is applied to one pulley (8), and the drive shaft is transmission connected to the outer shaft (2>) by the timing belt.Furthermore, a gear (9) is fixed to the inner shaft (4>). The inner shaft (4) is transmission connected to the winding shaft by a gear (9).

Furthermore, this mechanism has a cylindrical cam follower (10), and the cam follower (10) has a fixing pin (1) on the inner shaft (4).
1) is fitted. The pin (11) extends radially from the inner shaft (4) and is inserted into the counterbore (12) and through hole (13) of the inner shaft (4), and the cam follower (10) is inserted into the seat of the inner shaft (4). It is accommodated in the bore (12). and,
A nut (14) is screwed onto the pin (11), and the pin (11) and the inner shaft (4) are fixed by the nut (14). Further, a rolling bearing (15) is provided between the inner peripheral surface of the cam follower (10) and the outer peripheral surface of the pin (11), and the cam follower (lO) is rotatably guided around the pin (11). The bearing (15) is a needle type consisting of multiple needles (16).
The needle (16) is arranged between the inner peripheral surface of the cam follower (lO) and the outer peripheral surface of the pin (11).

On the other hand, the outer shaft (2) has a cam groove (17) of a certain length,
The cam groove (17) is formed on the peripheral wall of the outer shaft (2).

The cam follower (10) of the inner shaft (4) is inserted into this cam groove (17). As shown in Figure 2,
The cam groove (17) has a pair of wall surfaces (18) facing outward from each other, the width (W>) of which is equal to the diameter (
D>, and the wall surface (18) is inclined at a certain angle (α) in the direction of rotation as it goes toward the axial direction of the outer shaft (2).

Furthermore, a load detector (19) is provided at one end of the inner shaft (4). The load detector (19) is composed of a strain gauge type load cell and has a spherical detection end (20). The detection end (20) is in point contact with the detection rod (21) of the inner sleeve (4), and the rod (21) is housed in the inner hole of the inner shaft (4). Then, the inner peripheral surface of the inner shaft (4) and the rod (2
A rolling bearing (22) is provided between the outer peripheral surfaces of 1), an inner shaft (4) is rotatably guided relative to the rod (21), and the rod (21) is axially displaced relative to the inner shaft (4). It is kept from happening. Further, a plate (24) is inserted into the parallel groove (23) of the rod (21), and the rod (21) is restrained from rotating. In addition, the load detector (19) and plate (24) are connected to the winding arm (
1) is fixed and supported. Therefore, as will be described later, the thrust of the inner shaft (4) is transmitted to the rod (21) and the load detector (19), and the load detector (19)
receives the thrust of the inner shaft (4).

In the mechanism configured as described above, when the drive shaft of the motor is rotationally driven, the timing belt and pulley (8
), the driving torque is transmitted to the outer shaft (2). The outer shaft (2) is guided by the rolling bearing (3) of the winding arm (1), and the outer ring (2) rotates around its axis. Furthermore, the wall surface (18) of the cam groove (17)
) contacts the cam follower (10), the torque of the outer shaft (2) is transmitted to the inner shaft (4), and the outer shaft (2) and the inner sleeve (4)
) rotates as a unit. Then, the gear (9) of the inner shaft (4)
), the torque is transmitted to the winding shaft, and the winding roll and winding shaft rotate together. Therefore, the continuous web can be wound onto a take-up roll.

At the same time, the cam follower (lO) and cam groove (
17) converts torque into thrust.

The wall surface (18) of the cam groove (17) is the cam follower (lO)
When the torque of the outer shaft (2) is transmitted to the inner shaft (4) by the rolling bearing (5), the inner shaft (4)
is guided, and the inner shaft (4) can rotate along the inner peripheral surface of the outer shaft (2) and can also be displaced in the axial direction.

Therefore, torque is converted into thrust by the cam follower (10) and cam groove (17), and thrust is generated in the inner sleeve (4). This thrust is proportional to the torque of the outer shaft (2) and the inner shaft (4), and is proportional to the inclination angle (α) of the cam groove (17). Then, the thrust of the inner shaft (4) is transmitted to the detection rod (21) and the load detector (19), and the load detector (19) receives and detects the thrust of the inner shaft (4). Therefore, the load detector (19
) can detect the torque degrees of the outer shaft (2) and the inner shaft (4).

Therefore, the torque of the winding shaft can be detected by the load detector (19). Therefore, when the torque is feedback-controlled by the feedback control mechanism, the tension of the continuous web can be adjusted as desired. Therefore, the continuous web can be wound up accurately.

Also, when torque is converted into thrust by the cam follower (lO) and the cam groove (17), one of the pair of wall surfaces (18) of the cam groove (17) presses against the cam follower (10). and the other wall (18)
leaves the cam follower (10). The cam follower (10) is guided by the rolling bearing (15), and the cam follower (10) can roll along one wall surface. Therefore, only rolling friction occurs between the cam groove (17), the cam follower (lO) and the pin (11). Furthermore, the inner shaft (4) is guided by the rolling hair ring (5), and only rolling friction is generated between the inner peripheral surface of the outer shaft (2) and the outer peripheral surface of the inner shaft (4). Therefore, torque is smoothly converted to thrust, and thrust corresponds exactly to torque. In addition, the inner shaft (4), the detection rod (21) and the load detector (19
) between the rods (2
1) is restrained from rotating. If you want, the outer axis (
2) and the inner shaft (4) rotate, the detection rod (21
) does not rotate, and the load detector (19) is not affected by the rotation. Therefore, the torque of the outer shaft (2) and the inner shaft (4) can be accurately detected.

Furthermore, this mechanism has a simple configuration, as it only requires combining the outer shaft (2), the inner shaft (4), and the load detector (19). Therefore, the whole can be made compact. Therefore, by incorporating this at a position close to the winding shaft, it is possible to detect the torques of the outer shaft (2) and the inner shaft (4) at a position close to the winding shaft. As a result, the torque of the winding shaft can be detected accurately, and the tension of the continuous web can be adjusted accurately.

Note that various modifications can be made to this invention. For example, instead of the ball type rolling bearing (5), the circulating type rolling bearing (5') shown in Figs. 4 and 5 can be used.
may be used. This rolling bearing (5') also has a large number of balls (6'), and the balls (6') are the main body (
7') and circulates along the raceway groove. Thereby, the inner shaft (4) can be guided so as to be rotatable and displaceable in the axial direction.

Furthermore, instead of the needle type rolling hair ring (15) of the cam follower (lO), a ball type or circulating type rolling bearing may be used.

It is also conceivable to form a V-shaped cam groove as the cam groove (17) of the outer shaft (2). Furthermore, as shown in FIGS. 6, 7, and 8, a pair of split sleeves (25) are fixed to the end surface of the outer shaft (2).
5) may be formed with a V-shaped cam groove (17'). Then, insert the cam follower (10) of the inner sleeve (4) into this cam groove (17') so that the wall surface of the cam groove (17') <18'
) in the axial direction of the outer shaft (2) at a certain angle in the direction of rotation, the cam follower (10) and the cam groove (
17'), the outer shaft (2) and the inner shaft (4) can be rotated as one body, and the torque can be converted into thrust.

In addition to the slitter, the present invention can also detect the torque of the rotational drive system of other machines. It can be applied to any machine that needs to detect the torque of a rotational drive system.

As described in detail, the present invention can accurately detect torque with a simple configuration. So, for example,
In a slitter that winds a continuous web onto a take-up roll,
The entire torque detection mechanism can be made compact and can be incorporated at a position close to the winding shaft. As a result, the torque of the winding shaft can be accurately detected and the tension of the continuous web can be accurately adjusted, thereby achieving the intended purpose.

[Brief explanation of the drawing]

'Ii%1 Figure is a longitudinal sectional view showing one embodiment of the present invention, Figure 2 is a plan view showing the relationship between the groove on the outer shaft of Figure 1 and the cam follower on the inner shaft, and Figure 3 is a diagram showing the relationship between the cam follower on the inner shaft. ■-■ line sectional view of Figure 2,
Fig. 1 is a longitudinal sectional view showing a rolling bearing different from Fig. 1, Fig. 5 is a cross sectional view of the rolling hair ring shown in Fig. 4, and Fig. 6 is a longitudinal sectional view showing another embodiment of the present invention. 7 is an end view of the outer shaft and inner shaft of FIG. 6, and FIG. 8 is a plan view showing the relationship between the cam groove of the outer shaft and the cam follower of the inner shaft of FIG. 6. (2)・・・・・・・・・・・・・・・・・・・・・
・・・・・・Outer shaft (11)・・・・・・・・・・・・・・・
・・・・・・・・・・・・Inner shaft (5), (5'),
(Is)・・・Rolling bearing (10)・
・・・・・・・・・・・・・・・・・・・・・・・・
・No7 Follower (11)・・・・・・・・・・・・・
・・・・・・・・・・・・・・・Pin (17) , (17
' )・・・・・・・・・・・・・・・Cam groove (
19) Load detector Figure 6 Figure 7 Figure 8 Procedural amendment September 5, 1985 Mr. Patent Office Officer 66-1. Indication of the case 1985 Patent Application No. 174455 2
, Title of the invention Torque detection mechanism 3, Person making the correction (Relationship with '1) Patent applicant's name (name) Tengzai Seisakusho Co., Ltd. 4, Agent
604 6. Number of inventions increased by amendment Contents of amendment (1) Specification, page 13, lines 7 to 14, the words ``Ball-type rolling---in addition'' are deleted. (2) In the same book, page 13, line 15, the words ``or circulation type'' are deleted. (3) Same book, page 13, 3rd line to 2nd line from the bottom, text that says "Figure 6, Figure 7, and Figure 8", corrected to "Figure 4, Figure 5, and Figure 6" do. (4) In the same book, page 16, lines 5 to 7, the statement ``Figure 4 is a 1111 cross-sectional view'' is deleted. (5) In the same book, page 16, line 7, it says “Figure 6 is”,
``Figure 4'' is corrected. (6) In the same book, page 16, line 8, the phrase ``Figure 7 is based on Figure 6'' is corrected to ``Figure 5 is based on Figure 4.'' (7) In the same book, page 16, line 9, the statement ``Figure 8 is from Figure 6'' is corrected to ``Figure 6 is from Figure 4''. (8) The notices shown in the attached corrected drawings, Figures 4 and 5, will be deleted. (9) As shown in the attached corrected drawings, Figures 6, 7, and 18
The figure numbers in the figures have been corrected to Figure 4, Figure 5, and Figure 6, respectively. List of attached documents

Claims (1)

[Claims] An inner shaft is inserted into a rotatably supported cylindrical outer shaft, the outer shaft and the inner shaft are arranged in a concentric double shaft shape, and the inner circumferential surface of the outer shaft and the outer circumferential surface of the inner shaft are arranged. A rolling bearing is provided, the inner shaft is rotatably guided with respect to the outer shaft so as to be displaceable in the axial direction, and a cylindrical cam follower is fitted to a fixed pin extending from the inner shaft in the radial direction. A rolling bearing is provided between the inner circumferential surface of the cam follower and the outer circumferential surface of the pin, the cam follower is rotatably guided around the pin, and the cam follower is inserted into a cam groove formed on the outer shaft. , the wall surface of the cam groove is inclined at a certain angle in the rotational direction as it goes in the axial direction of the outer shaft, and a load detector is provided on one end side of the inner shaft, and the load detector receives the thrust of the inner shaft. The outer shaft and the inner shaft are integrally rotated by the cam follower and the cam groove, and at the same time, the torque is converted into thrust, and the torque of the outer shaft and the inner shaft is detected by the load detector. A torque detection mechanism characterized by: