JPS62118155A - Method of converting constant rotational motion of rotary drive shaft into variable linear motion of slide follower and rotary drive shaft therefor - Google Patents

Abstract

PURPOSE:To enlarge the applicable range of a rotary drive shaft which converts constant rotational motion into variable rotational motion, by forming several kinds of spiral recessed grooves in the outer periphery surface of the drive shaft, and by engaging an engaging element attached to a slide follower, in the recessed grooves. CONSTITUTION:An engaging element 45 attached to a slide follower A is engaged in one of several kinds of spiral recessed grooves 35 having different leads L1, L2, L3 which are formed in the outer peripheral surface of rotary drive shaft 28. With this arrangement stepless speed change motion is obtained through the slide follower A only by rotating the rotary drive shaft 28 at a constant speed without the necessity of variable speed rotation of the rotary drive shaft. Thereby, it is possible to ensure several kinds of fine motions in the form of the linear speed change motion of the rotary drive shaft 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for converting constant speed rotational motion of a rotary drive shaft into linear variable speed motion of a slide follower, and a rotary drive shaft used for that purpose.

For example, with an industrial sewing machine, it is necessary to sew the fabric material of the garment finely or roughly.
In order to deal with this problem, in the prior art, the speed at which the fabric material is fed to the sewing needle of the sewing machine is usually changed by rotating the motor at variable speeds. For this reason, it is not easy to obtain various minute changes in the feeding speed, and a special, extremely expensive motor with a transmission must be installed, causing operational problems. There are some problems that can easily occur. This applies not only to the feeding of fabric materials to industrial sewing machines, but also to the general transportation of various articles.

The present invention aims to solve these problems, and its details will be explained based on the illustrated embodiments.
In Figure 5, (F) is an installation frame for installing the feeding device on the work floor, and this includes the fabric material (M).
A sewing machine (10) that sews (for example, fabric that forms pockets of clothes) and a top plate (11 ) A slide follower (A) that moves the slide follower (A) forward while pressing upward, a drive mechanism (B) that moves the slide follower (A) reciprocating linearly in the front and rear direction at variable speeds, and a material after sewing. A cutting mechanism (C) for cutting (M) into a certain size is installed.

First, the sewing machine (10) is attached to the top plate (1) of the installation frame (F).
1) A sewing needle (not shown) is fixedly mounted on the top, and is equipped with a sewing needle (not shown) which is linearly moved up and down at a constant speed using the motor (12) as a driving source. Since this is known as such, the sewing needle material (M
) is merely indicated by the reference numeral (Y - Y) in the figure, and a detailed explanation of its structure and function will be omitted. )
The material is passed forward as shown by the arrow (P) in Fig. 1.4.5, and is subjected to the required sewing action in the transition process.

After the sewing operation is completed, the material (M) is cut into a certain size by the cutting mechanism (C). As shown in Figure 6.7, the cutting mechanism (C) consists of a pantograph mechanism that is moved up and down by an air cylinder (not shown), and is located inside the installation frame (F) at a position directly below the material (M). It has been assembled and installed. (
13) is the elevating tool rest (1) that forms the pantograph mechanism.
4) It is a cutter that is installed on the top so that it can be exchanged freely,
Together with a presser plate and a ruler, which will be described later, which press the material (M) from above, the material (M) is cut from below.

Next, the slide follower (A) transfers the material (M) to the top plate (11
), it is moved forward in the direction of the arrow (P) above, and as soon as the cut material It (M) is moved forward, the sewing needle continues to move the next material (M). It is now being moved back to the rear in preparation for being sent to Japan. This consists of the dough presser plate (15) and the swinging arm (
16), a cylinder mounting column (17), a connecting spacer (18), and a slide plate (19), and so that these various members as a whole can reciprocate linearly in the above-mentioned front-back direction, the following steps are taken: It is assembled.

That is, the dough presser plate (15) and the swinging arm (16) are
．． As is clear from Fig. 3, the left and right needles are arranged in parallel at a constant interval so as not to obstruct the stitching action of the material (M) by the sewing needles, and so that they can operate integrally with each other. They are connected and fixed via a plurality of rivets and screws (20).

In that case, the swinging arm (16) is connected to the L-shaped dough presser plate (1
The upright piece 5) extends forward, so to speak, and in the middle of the extension, it is attached to the corresponding pair of left and right cylinder mounting struts (17) so as to be able to see-saw through horizontal pivot pins (21). There is.

The cylinder mounting support (17) has an inverted shape, and its legs are integrally planted on a connecting spacer (18), and the dough presser vi ( Air cylinder (2) for raising and lowering the
2) is fixedly installed. In other words, in Fig. 1.4, the front end of the swinging arm (16) is raised, and the material (M) is moved onto the top by the dough presser plate (15) that has descended around the pivot pin (21). (11) is shown, but when the front end of the swing arm (I6) is lowered from that state by the piston rod of the cylinder (22), the dough presser plate will move as shown in Figure 5. (15) conversely floats up from the top plate (11) centering on the pivot bottle (21), releasing the pressing force of the material (M), and thus the next material CM ) can be bitten.

A pair of inverted T-shaped fabric presser rulers (23) at the front and rear, which are positioned across the sewing action position (Y-Y), are also faced from above between the two fabric presser plates (15) facing each other. The pair of rulers (23) always remain parallel to the top plate (11) and are raised and lowered at the same time. The operating mechanism is not shown. When cutting the material (M) with the cutter (13), this dough presser plate (15
) and the ruler (23) press the material (M) from above, as described above.

One connecting spacer (18) is connected to the cylinder mounting column (1
7) and the slide plate (19), and is generally made of H-shaped steel.

The cylinder mounting column (17) and the swinging arm (16) are supported by one spacer (18) so as to face the material (M) through the opening gap (not shown) in the top plate (11).
) and the fabric presser plate (15) are located in a biased position toward the sewing action position (Y-Y) of the sewing machine (10) in the installation frame (F), as is clear from FIG. On the other hand, the slide plate (19) extends horizontally at a mid-height position of its installation frame (F), and also across the frame (F), and from now on, it extends horizontally in the left and right direction. a distal support leg (24);
Intermediate support legs (25) located between the two are integrally suspended. However, its supporting legs (24) (25)
It goes without saying that a plurality of these may be combined into one as a whole.

(26) is a pair of front and rear support bars that are fixed horizontally at a mid-height position of the installation frame (F), and (27) is a plurality of support bars that are also horizontally fixed along the front and back direction of the installation frame (F). This is a slide guide rail for books (three in total in the figure), and both ends thereof are supported by support bars (26). The support legs (24) and (25) of the slide board (19) are slidably passed through the guide rail (27), and are moved in the front and back direction by a drive mechanism (B) which will be described in detail next. It is designed to perform reciprocating linear motion.

Therefore, as long as the slide board (19) can be guided linearly, instead of having the round shaft guide rail (27) penetrate through the support legs (24) and (25) of the slide board (19) as shown in the figure. , the support legs (24) (25) and the guide rail (27) are fitted in a so-called concave-convex manner, or the support legs (24) (25) are simply placed on the guide rail (27), etc. Also good.

The drive mechanism (B) of the slide driven body (A) has a pair of left and right rotary drive shafts (28
) (29), a drive source such as a motor (30) that rotates the front drive shaft (2B) (29), and a timing belt (31) that rotates the front drive shafts (28) and (29) in synchronization with each other. It consists of a transmission body such as a chino, a chino, and a gear, and the rotational motion of the drive shaft (28) (29) is converted into the linear motion of the slide plate (19).

That is, the pair of rotation drive shafts (28) and (29) extend along the front and back direction of the installation frame (F) in a parallel state parallel to the guide rail (27), and both front and rear ends thereof Both parts are attached to the support bar (26) of the installation frame (F).
) is rotatably supported via a bearing (32), and the same (middle portions are loosely passed through the intermediate support legs (25) of the slide board (19).

Furthermore, a timing pulley (33) is fixed to the front end of each of the front drive shafts (28) (29), and this pulley (33) and the output pulley (30) of the motor (30)
timing bell) (31) hung between the timing bell (34) and
), the front drive shafts (28) and (29) are rotated together at a constant speed in the same direction.

In that case, to further refer to each of the reconfirmation axes (28) and (29), first, the fabric material (M) is sewn using the sewing machine 10).
As shown in FIG. 8, there is a lead (Ll) on the outer peripheral surface of the rotary drive shaft (28) that moves the slide ff1 (19) forward in the direction of the arrow (P). (
L2) (L3) three different types of 4! I-circular concave groove (35
) is engraved in a continuous form toward one direction (f) of the spiral, and its lead (LL) (L2)
The speed of the linear sliding movement of the slide board (19) is changed according to the difference in length (L3), so that the fabric material CM) can be sewn roughly or finely.

In this regard, the figure shows three types of spiral concave IRs (35) corresponding to changes in length of leads (Ll) (L2) (L3), but the number of types depends on the sewing method of the fabric material (M). It can be further increased or decreased by In addition, although the engraving depth H) is set to be the same among several types of spiral recesses 1 (35), the engraving depth H) may also be varied between several types. Therefore, its depth H) and lead (Ll) (1,2)
(L3) may be used to obtain even more various speed change movements of the slide 1lli (19). The opening shape of the spiral groove (35) is also not limited to the concave arc-shaped cross section as shown in the figure.

On the other hand, in order to feed the next dough material (M) forward, the outer peripheral surface of the rotary drive shaft (29) that moves the slide plate (19) backward is also provided with a spiral concave as shown in Fig. 9. The groove (36) is engraved, but the I! ! The lead (L) of the I-turn concave groove (36) is connected to the forward rotation drive shaft (28).
), and is carved as a uniform type that does not change in length over the entire length of the drive shaft (29). Furthermore, the directionality of the spiral is used for the backward movement of the slide plate (19), so that the forward movement rotary drive shaft (2
It is set in a continuous form in which the direction (r) opposite to that of 8) is intersected, so that the slide plate (19) can be moved rearward at high speed, as if it were to be moved back quickly. There is.

Furthermore, (37) and (38) are the above two rotating shaft drive shafts (28).
) These are air cylinders for forward and backward movements corresponding to (29), and as is clear from Fig. 2.11.13, they are fixedly installed on the slide ff1 (19) in a pair of left and right parallel positions. (39) and (40) are respectively connected to the drive shafts (28) from the air cylinders (37) and (38).
) It is a piston rod hanging toward (29), and is controlled in elevation by electromagnetic control pulps (41) (42) connected to the air cylinder (37) (3B). . (43)(
44) is a ball holding case that is screwed onto the hanging tips of the piston rods (39) and (40), and is assembled in an upright U-shape in cross section, and is held in a rotatable manner inside the case. Ball-shaped engager (45) (46
) of the drive shaft (2B) (29) on the circular arc surface exposed from the case (43) (44).
35) and (36) in a bondable manner. However, the engaging members (45) and (46) may be provided in a non-rolling, non-ball form. (47) (48) is its engager (45) (46)
springs for applying back pressure to each case (43);
(44), which causes a rotation? 1
5 (35) (36) to smoothly dampen the engagement action.

The forward rotary drive shaft (2nd) and the backward rotary drive shaft (29) are connected to the corresponding engagers (45) (46) which are mounted and held on the slide plate (19) Ill, and their mutual engagement. It is controlled to selectively engage. In other words, as shown in Fig. 10.11, the forward movement engager (45) is inserted into the spiral concave groove (35) of the forward rotation drive shaft (28).
is engaged and the slide 51 (19) is moving linearly forward, the double-acting engager (46) is disengaged from the double-acting rotary drive shaft (29). On the other hand, as shown in Figure 12.13, its rotational drive shaft (29)
IJ! l! When the backward movement engaging element (46) is engaged with the turning groove (36) and the slide plate (19) is moving backward in a quick return manner as described above, the forward movement engaging element (46)
is disengaged from its rotary drive shaft (28), and such a switching operation is performed by the control pulp (28).
41) (42) to air cylinder (37) (3
This can be achieved by controlling the air supply and discharge to B). In addition, the above air cylinder (37) (
Regarding 3B), it is of course possible to use a hydraulic cylinder instead.

According to the above configuration, the motor (30) rotates the forward and backward rotation drive shafts (28) (29) in the same direction at a constant speed via the timing bell (31). At the same time, its forward rotational drive shaft (28
) into the spiral groove (35) of the corresponding engager (45
) by engaging the engager (45) beam.
(Ll) (L2) (L3) The slide driven body (A) including the slide plate (19) is rolled along the guide rail (27). , the fabric material (M) on the top plate (11) can be moved linearly forward in the direction of the arrow (P) in a continuously variable manner.
10) With the sewing needle, it is possible to sew roughly or finely (stitch) to the desired state.

After the sewing operation is finished, the cutter (
As mentioned above, the material (M) is cut to a predetermined size by 13), but as soon as the sliding follower (A) reaches the forward movement end point, the backward movement rotary drive shaft (29
) into the spiral groove (36) of the corresponding engager (46
) is selectively engaged with the reciprocating engager (46) in the uniform spiral concave groove (3) of the lead (L).
6) The slide i (19) also moves along the guide rail (27) in a quick backward linear motion and returns to the position ready for feeding the subsequent dough material (M). become. At the end position of the backward movement, the dough holding plate (15) is lifted from the top tffl (11) as shown in Fig. 5, and during the forward movement, as is clear from Fig. 4, The dough presser plate (15) descends and the dough material (M
), and the interlocking operation of the dough presser plate (15) and the slide follower (A) is as follows:
The overall position, including the cutting action of the fabric material (M) by the cutter (13), is detected by sensors (not shown) and is automatically and electrically operated. Although an embodiment has been described in which the present invention is applied to a device for feeding fabric material into an industrial sewing machine, it goes without saying that the present invention can be applied to other applications as well.

In summary, the present invention includes a rotary drive shaft (28) that is rotated at a constant speed by a drive source such as a motor (30), and a slide that moves linearly along a guide rail (27) parallel to the drive shaft (28). It consists of a driven body (A) and a lead (LL) (L2) (
Several types of 'n' PIjl concave grooves (35) with different L3) are carved so that the spirals are continuous as a whole in one direction (f), and the attachment to the slide follower (A) is maintained. By engaging the engaged element (45) into the spiral groove (35) and rotating the drive shaft (28) at a constant speed, the slide driven body (A) is automatically moved at continuously variable speed. This setting has the effect of completely solving the aforementioned problems of the prior art.

In other words, there are leads (Ll) (L2) (L3) on the outer peripheral surface.
There are several different types of 4! Using a rotary drive shaft (28) carved with an I-spiral concave groove (35) in which the spiral continues in one direction (f), By simply engaging the engager (45) on the slide driven body (A) side with the JS (35) and rotating the drive shaft (28) at a constant speed by the motor (30), the slide driven body (A) Therefore, the motor (30
) as a special product with a transmission, there is no need to rotate it at variable speeds, and as a linear variable speed movement of the slide driven body (A), various minute movements can be easily secured, expanding its range of application. It is also very beneficial in terms of what you can get.

[Brief explanation of drawings]

The figures show an embodiment of the present invention applied to a fabric material feeding device of an industrial sewing machine, with FIG. 1 being a schematic side view of the entire device, FIG. Figure m-m
FIG. 4.5 is a schematic side view showing the forward movement end point of the slide driven body and the state of the position reached to the forward movement end point, and FIG. 6 is a side view showing the cutting mechanism extracted. , Fig. 7 is a front view, Fig. 8.9 is a side view showing the rotary drive shafts for forward motion and rhythmic motion, and Fig. 10 is a cutaway along the line X-X in Fig. 2. 11 is an enlarged sectional view taken along the line XI-XI in FIG. 10, and FIG.
FIG. 2 is a partially cutaway side view and an enlarged sectional view respectively showing the backward movement state of the slide driven body corresponding to FIG. 0.11. (A) ......Slide driven body (B) ・
...... Drive mechanism (C) ... Cutting mechanism (F) ... Frame with hem (M) ...
...Fabric material (L) (LL) (L2)L3)...Lead (10
) ...Sewing machine (19) ...Slide board (27) ...Slide guide rail (28)
(29) ... Rotation drive shaft (30) ...
... Motor (31) ... Timing belt (35) (
36) ...Spiral groove (37) (38)
...Air cylinder (39) (40) ・
... Piston rod (43) (44) ...
...Ball holding case (45) (46) ...
・Engagement element (47) (48) ...Spring patent applicant Ken Higashio Dosage Kenji Higashio Hiroshi Higashio, ・-1, l, Figure 3

Claims (1)

[Claims] 1. A rotating drive shaft (28) rotated at a constant speed by a drive source such as a motor (30), and linearly moving along a guide rail (27) parallel to the drive shaft (28). It consists of a slide driven body (A), and leads (L1) (L2) are attached to the outer peripheral surface of its drive shaft (28).
) (L3) are carved in several types of spiral grooves (35) with different spirals facing in one direction (f), and an engager (45) attached and held on the slide follower (A). is engaged in the spiral groove (35) and rotates the drive shaft (28) at a constant speed, thereby automatically causing the slide driven body (A) to move at continuously variable speed. A method of converting constant speed rotational motion of a rotary drive shaft into linear variable speed motion of a sliding driven body. 2. The engager (45) is in the form of a ball that can freely roll and is held at the tip of the piston rod (39) of the cylinder (37) attached to the slide follower (A), and the engager (45) has a spiral shape. The sliding driven member is characterized in that a spring back pressure is applied to buffer the engagement action with the concave groove (35). How to convert into linear variable speed motion. 3. Several types of spiral concave grooves (35) with different leads (L1) (L2) (L3) are formed on the outer peripheral surface, and the spiral grooves are arranged in one direction (f).
A rotary drive shaft for converting a constant speed rotational motion of the rotary drive shaft into a linear variable speed motion of a slide driven body, characterized in that the rotary drive shaft is carved in a continuous form toward the direction of the rotary drive shaft. 4. Claims characterized in that the engraving depth (H) of the spiral groove (35) is varied in depth and shallowness among several types of leads (L1) (L2) (L3) of which are different. - A rotary drive shaft for converting the constant speed rotational motion of the rotary drive shaft described in item 3 into linear variable speed motion of the slide driven body.