JPH0426458A - Tip drawing roller device for sewing machine - Google Patents

Abstract

PURPOSE:To execute the change between each specifications by the minimum parts change by using in common a roller driving mechanism part, a transmission mechanism part and a supporting mechanism part, in both cases of the upper roller specifications and the upper/lower roller specifications. CONSTITUTION:With respect to a jaw part 4 of a sewing machine frame l, a roller driving mechanism part 12 is attached so that a fitting position can be changed between an upper roller form state position in the center position and an upper/lower form state position in the rear position, and also, with respect to a roller driving mechanism part 2, a supporting mechanism part 31 is attached so that the fitting position can be changed between the upper and the lower positions. In a state that the roller driving mechanism part 12 is attached to the upper roller form state position, and also, the supporting mechanism part 31 is attached to the lower position, a transfer axis 45 of the upper roller form roller braid 41 and a roller holder 42 can be connected and the upper roller specifications can be set. Also, in a state that the roller driving mechanism part 12 is attached to the upper/lower roller form state position, and also, the supporting mechanism part 31 is attached to the upper position, the upper/lower roller specifications are set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) The present invention relates to a cloth-pulling roller device that plays an auxiliary role in feeding cloth in sewing machines.

(Prior art) Conventional cloth pulling roller devices include an upper roller type that feeds the work cloth between the upper roller and the throat plate, and a lower roller that is attached to the sewing machine frame and connects the lower roller and the upper roller. There are upper and lower roller types that feed the work cloth between them, and both are equipped with a drive mechanism suitable for rotating the upper roller by rotation of the main shaft (upper shaft) of the sewing machine. In this case, the former upper roller type cloth pulling roller device is suitable for sewing thin fabrics, and the latter upper and lower roller type cloth pulling roller device is suitable for sewing thick fabrics, or is it a product shipped from the manufacturer? Many of these machines are equipped with the former upper roller type cloth pulling roller device.

(Problem to be Solved by the Invention) In the conventional configuration, when changing from the upper roller specification to the upper and lower roller specifications, an upper and lower roller type cloth pulling roller device is purchased and replaced with the upper roller type cloth pulling roller device. It has to be assembled, which increases the cost and also makes it difficult to assemble and adjust.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a cloth-pulling roller device for a sewing machine that allows changes in upper roller specifications and between upper and lower roller specifications with minimal replacement of parts. It is in.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a sewing machine in which a work cloth is sewn using a needle, a looper, a feed dog, etc. in an arm portion of a sewing machine frame.
a roller drive mechanism unit having a roller drive shaft that is mounted on the sewing machine frame so as to be adjustable in position between an upper roller configuration position and an upper and lower roller configuration position and that is oriented vertically and rotatable in one direction; A transmission mechanism section that rotates a roller drive shaft of the mechanism section in accordance with rotation of the main shaft of the sewing machine, and a support mechanism section that is attached to the roller drive mechanism section so as to be vertically adjustable and have a connecting shaft, the roller drive mechanism section is attached to the upper roller configuration position and the support mechanism is attached to the lower position, the rotation is transmitted to the upper roller corresponding to the throat plate of the arm, the roller holder holding the same, and the upper roller. A transmission shaft and a roller holder in an upper roller type roller assembly consisting of transmission shafts are removably connected to the roller drive shaft and the connection shaft, and the roller drive mechanism section is attached to the upper and lower roller configuration positions and the support mechanism When the section is attached to the upper position, the upper and lower rollers are composed of an upper roller corresponding to the lower roller attached to the cloth feeding side of the arm section, a roller holder that holds the upper roller, and a transmission shaft that transmits rotation to the upper roller. The present invention is characterized by a configuration in which a transmission shaft and a roller holder in a roller type roller assembly are detachably connected to the roller drive shaft and connection shaft.

(Function) According to the cloth pulling roller device of the sewing machine of the present invention, when the roller drive mechanism is installed in the upper roller form position and the support mechanism is installed in the lower position, the upper roller type roller assembly is It is an upper roller specification that can be attached, and if the roller drive mechanism is installed in the upper and lower roller form position and the support mechanism is installed in the upper position, the upper and lower roller type roller assembly can be installed. becomes. In both cases of the upper roller specification and the upper and lower roller specification, the roller drive mechanism section, transmission mechanism section, and support mechanism section can be used in common, and the number of replacement parts can be kept to a minimum.

(Example) Hereinafter, an example in which the present invention is applied to a double chainstitch arm sewing machine will be described with reference to the drawings.

First, Fig. 2 shows a double chainstitch arm sewing machine.
For convenience of explanation, illustration of a cloth pulling roller device to be described later is omitted. In FIG. 2, a sewing machine frame 1 includes a base 2. As shown in FIG. A support 3 is erected on the base 2, and an arm 5 having a jaw 4 extends horizontally from the support 3. The base 2 also has an arm 6 in a direction perpendicular to the arm 5.
is extended, and its tip faces the jaw portion 4 from below. Furthermore, although not shown, a needle bar drive mechanism driven by the sewing machine main shaft (upper shaft)-7 (see Fig. 4) is disposed in the arm 5, and this needle bar drive mechanism causes vertical movement. For example, three needles 9 are attached to the needle bar 8. Although not shown in the drawings, a cloth feed mechanism and a looper drive mechanism that are driven by the main shaft (lower shaft) of the sewing machine are provided in the arm 6, and the cloth feed mechanism feeds the throat plate 10. The teeth are adapted to carry out a cloth feeding movement, and the looper is arranged to carry out a needle thread catching movement by means of a looper drive mechanism. A presser foot 11 is attached to the jaw 4 of the sewing machine frame 1 so as to be movable up and down in correspondence with the throat plate 10.

Now, a cloth-pulling roller device with an upper roller specification will be described with reference to FIGS. 1 and 3 to 5.

The roller drive mechanism section 12 has a long base frame 1 extending in the vertical direction.
It has 3. A roller clutch 14 is attached to the upper end of the base frame 13. The roller clutch 14 is
It has a leaf spring 152, a rotating body 16, a shaft 17, etc., and one rotation of the reciprocating rotation of the rotating body 16 is transmitted to the shaft 17. The shaft 17 is supported by a bearing 18 at the upper end of the base frame 13 and projects downward, and the lower end of the shaft 17 is connected to a joint 19.

A connecting member 20 is connected to the joint 19 so as to be vertically movable relative to the joint 19 and rotatable therewith, and a connecting hole 21 is formed in the lower end of the connecting member 20. And the above axis 17. The joint 19 and the connecting member 20 constitute a roller drive shaft 22 . Note that a communication hole 23 corresponding to the connection hole 21 is formed at the lower end of the base frame 13 .

Mounting plates 24 and 25 are fixed to the upper and lower ends of the base frame 13. Further, a support body 26 is attached to the upper end of the jaw portion 4 of the sewing machine frame 1, and this support plate 26 has mounting holes 27 and 27 (see FIG. 8) located at the center for the upper roller configuration position. ) is formed, and a mounting hole 2 for the upper and lower roller configuration positions is formed at the rear (left side in Figures 1 and 3 and upper side in Figure 5).
8°28 (see Figure 5) is formed. The upper mounting plate 24 of the base frame 13 is attached to the support plate 26 by screwing bolts 29.29 into the mounting holes 27.27 at the center thereof, and the mounting plate 25 is attached to the front of the lower end of the jaw 4. It is attached to the side portion (the right side in FIGS. 1 and 3, and the lower side in FIG. 5) with a bolt 30 through a long hole 25a.

As described above, the roller drive mechanism section 12 is attached to the jaw section 4 of the sewing machine frame 1 at an upper roller configuration position located approximately at the center of the front and back thereof.

The support mechanism section 31 includes a support stand 32. A connecting shaft 33 is supported on the support base 32 so as to be movable in the vertical direction, and a connecting member 34 is fixed to the upper end of the connecting shaft 33. Further, a presser foot lifting lever 35 is pivotally mounted on the support base 32 so as to be rotatable in the vertical direction, and the upper end surface of the lever 35 is brought into contact with the tongue portion 34a of the connecting member 34. When the presser foot lifting lever 35 is rotated upward, the tongue portion 34a is pushed up by the cam portion 35a, and thus,
The connecting shaft 33 is adapted to be moved upward via the connecting member 34. Note that the connecting shaft 33 includes a spring receiver 36 and a compression coil spring 37.

A mounting plate 38 is integrally attached to the support base 32, and five mounting holes 39 (see FIGS. 4 and 7) are provided on the back surface of the base frame 13, located vertically. ) is formed. The mounting plate 38 is mounted to the base frame 13 by screwing bolts 40 into the lower three mounting holes 39 of the five mounting holes 39, respectively. As a result of the above, the support mechanism section 31 is attached to the base frame 13 in "8. It is installed in the lower position of the lower position.

The upper roller type roller introduction product 41 is equipped with a roller holder 42, and an upper roller 43 is pivotally mounted on the roller holder 42.A transmission shaft 45 is connected to the roller holder 42 via a bearing 44 to move it up and down. A bevel gear 46 is fixed to the lower end thereof, and a bevel gear 47 that meshes with this bevel gear 46 is fixed to the shaft of the upper roller 43. , the roller holder 42 has a bevel gear 4
A cover 48 covering 6° 47 is attached.

Thus, a rectangular connecting protrusion 45 is provided at the upper end of the transmission shaft 45.
a is formed, and this connecting protrusion 45a connects to the base frame 13.
It is inserted and fitted into the connecting hole 21 of the connecting member 20 through the communicating hole 23 of the connecting member 20, and the two are removably connected by four screws (see FIG. 1). Further, a connecting hole 50 is formed in the roller holder 42, and a connecting shaft 33 of the support mechanism section 31 is inserted into this connecting hole 50, and the roller holder 42 has a screw 51 (see FIG. (see). In this case, a compression coil spring 37 is interposed between the roller holder 42 and the upper spring receiver 36, and the spring force of the compression coil spring 37 always urges the roller holder 42 downward. The upper roller 43 is brought into pressure contact with the throat plate 10.

As described above, the upper roller type roller assembly 41 is removably attached to the roller drive mechanism section 12 and the support mechanism section 31.

The transmission mechanism section 52 is a sewing machine main shaft (upper shaft) 7 (see Fig. 4).
It is equipped with an eccentric wheel 53 fixed to the
A link 54 that fits is connected to a joint 55. The base end of the drive lever 56 is attached to the shaft 5 of the joint 55.
7, and each time the main shaft 7 of the sewing machine rotates once, the drive lever 56 rotates back and forth once in the left-right direction. A long hole 56 is provided at the tip of the drive lever 56.
A is formed in the elongated hole 56a, and a shaft 59 of a joint 58 is fitted and connected to this elongated hole 56a. Moreover, the roller drive mechanism section 12
The lever portion 16a of the rotating body 16 is connected to a joint 60, and this joint 60 and the aforementioned joint 58 are connected by a connecting rod 61. Therefore, the drive lever 56
When the connecting rod 61 is rotated back and forth, the connecting rod 61 is moved back and forth in a straight line,
Along with this, the rotating body 16 is rotated back and forth.

The presser foot lifting drive mechanism 62 includes a drive lever 63.
The base end of the drive lever 63 is rotatably mounted on the back of the column 3 of the sewing machine frame 1 with a pin 64, and the tip is connected to a foot pedal (not shown) via a chain 65. has been done. And the drive lever 6
A connecting member 66 is attached to the base end of 3. or,
The middle part of an L-shaped lever 67 is rotatably mounted on the back side of the jaw part 4 of the sewing machine frame 1 with a stepped screw 68, and one end part of this lever 67 is driven via a connecting lever 69. It is connected to a connecting member 66 in the lever 63. The other end of the lever 67 is connected to the connecting member 34 in the support mechanism section 31 via the connecting lever 70.
is removably connected to.

When the main shaft 7 of the sewing machine is rotated, the needle 9 moves up and down, a looper (not shown) captures the needle thread, and a feed dog (not shown) feeds the work cloth in the direction of arrow A. Then, double chainstitching of the work cloth is performed. Further, while the sewing machine main shaft 7 is rotating, the drive lever 56 of the transmission mechanism section 52 is driven by the eccentric wheel 53. Link 54. Joint 55 and shaft 57
Correspondingly, the connecting rod 61 is linearly reciprocated in the direction of arrow C and the opposite direction, and therefore, the rotation of the roller drive mechanism section 12 is The moving body 16 is reciprocated in the direction of the arrow and in the opposite direction. The rotation in one direction of the reciprocating rotation of the rotating body 16 is transmitted to the shaft 17 by the roller clutch 14, and the rotation of the shaft 17 is further transmitted to the transmission shaft 45 of the upper roller type roller assembly 41. The upper roller 43 is a bevel gear 46
The work cloth is rotated in the direction of arrow E through 47 degrees, and the work cloth located between the upper roller 43 and throat plate 10 is fed in the direction of arrow A. In this case, the feed dog that mainly feeds the work cloth in the direction of arrow A and the upper roller 43 that feeds the cloth auxiliary are both operated based on the rotation of the sewing machine main shaft 7, so the feed dog feeds the work cloth. It is possible to easily maintain a synchronous relationship in which the upper roller 43 is rotated only while the upper roller 43 is rotating.

Note that when the presser foot lifting lever 35 is rotated in the upward direction of the arrow F as described above after stopping the rotation of the sewing machine main shaft 7, the upper roller type roller assembly 41 is moved together with the connecting shaft 33. The same applies when the chain 65 is pulled downward by being moved upward or by stepping on a foot pedal (not shown).

That is, when the chain 65 is pulled downward, the drive lever 63 is rotated in the direction of arrow G, thereby causing the connection lever 6
9 is moved in the direction of arrow H, and in response, the lever 67 is rotated in the direction of arrow 1, so that the connecting lever 70 is pulled upward, and the connecting shaft 33 is pulled upward via the connecting member 34. This is because it will be moved to In this case, when the presser foot lifting drive mechanism 62 is activated, the presser foot 11 is also moved upward by a mechanism within the sewing machine frame 1.

Now, referring to FIGS. 6 to 8, a cloth pulling roller device having upper and lower roller specifications will be described. The same parts as in FIGS. 1 to 5 are designated by the same reference numerals.

First, the mounting plate 24 of the roller drive mechanism section 12 is attached to the support plate 26.
The mounting plate 25 is mounted by screwing bolts 29, 29 into the mounting holes 28, 28, and the mounting plate 25 is mounted approximately at the center of the lower end of the jaw portion 4 with a bolt 71 through a long hole 25a. As described above, the roller drive mechanism section 12 is attached to the jaw section 4 of the sewing machine frame 1 at a position on the rear side of the jaw section 4 in the form of upper and lower rollers.

The mounting plate 38 of the support mechanism section 31 is attached to the base frame 13 at its top and bottom 5.
It is mounted by screwing bolts 40 into the upper three mounting holes 39 of the three mounting holes 39, respectively. As described above, the support mechanism section 31 is attached to the base frame 13 in the upper position of the upper and lower positions.

Further, as the roller drive mechanism section 12 and the support mechanism section 31 are moved to the rear side, the transmission mechanism section 52 is changed as follows. That is, the shaft 57 of the joint 55 (see FIG. 4) is connected to the joint 72, and the shaft 73 is connected to the joint 72, and the shaft 73 is connected to the drive lever 56.
It is now connected to.

Further, regarding the upper and lower roller type roller combination 41', parts corresponding to the upper roller type roller combination 41 are indicated by adding a dash (') to the reference numeral. In this case, the upper roller 43'
is set to have a larger diameter than the upper roller 43, and the transmission shaft 45' is formed to be shorter accordingly. Similarly to the above-mentioned upper roller specification, the transmission shaft 45' is connected to the connecting member 20 (first
(see figure) by a screw 49, and the roller holder 42' is removably connected to the connecting shaft 33 by a screw 51. As described above, the upper and lower roller assembly 41' is removably attached to the roller drive mechanism section 12 and the support mechanism section 31.

In this case, a support 74 is attached to the end surface of the tip of the jaw 4 of the sewing machine frame 1 on the cloth feeding side, on which a lower roller 75 with a one-way clutch is supported, and an upper roller 43' is pressed against the lower roller 75.

In the presser foot lifting drive mechanism 62, a connecting lever 7 is connected between the lever 67 and the connecting member 34 instead of the connecting lever 7o.
6 (see Figure 7).

While the sewing machine main shaft 7 (see FIG. 4) is rotating, the upper roller 43' is rotated in the direction of the arrow E in the same manner as the upper roller 43 described above, and the lower roller 75 is also rotated in the direction of the arrow J. When rotated, the work cloth between them is fed in the direction of arrow A.

According to this embodiment, the following effects can be obtained. That is, the roller drive mechanism part 12 is mounted to the jaw part 4 of the sewing machine frame 1 so that the mounting position can be changed between the upper roller form position at the center and the upper and lower roller form positions at the rear position. Since the support mechanism section 31 is attached to the roller drive mechanism section 12 so that its position can be changed between the upper and lower positions, the roller drive mechanism section 12 can be attached to the upper roller configuration position. When the support mechanism section 31 is installed in the lower position, the transmission shaft 45 and roller holder 42 of the upper roller type roller assembly 41 can be removably connected to the roller drive shaft 22 and connection shaft 33. , an upper roller specification, and when the roller drive mechanism section 12 is installed in the upper and lower roller configuration position and the support mechanism section 31 is installed in the upper position, the roller drive shaft 22 and the connecting shaft 33 is a transmission shaft 45' of an upper and lower roller assembly 41'.
The roller holder 42' can be removably connected, and an upper and lower roller type can be used. When changing from upper roller specification to upper and lower roller specification,
New upper and lower roller type roller assembly 41'2 joint 72. axis 7
3. All that is required is to prepare the lower roller 75 and the connecting lever 76, and the roller drive mechanism section 12. Support mechanism section 31. The transmission mechanism section 52 and the presser foot lifting drive mechanism 62 can be used in common. Therefore, it is possible to change between the upper roller specifications and the upper and lower roller specifications with a minimum number of parts replacements, which can be done easily, and assembly and adjustment are easy.

[Effects of the Invention] As explained above, the cloth pulling roller device of the sewing machine of the present invention can change the specifications of the upper roller and the specifications of the upper and lower rollers with a minimum of parts replacement, and can be done at low cost and is easy to assemble. The attachment has the excellent effect of making adjustment easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 5 show the upper roller specifications, and FIG. 1 shows a main part in cross section.
2 is a perspective view of the double chainstitch arm sewing machine, FIG. 3 is a side view, FIG. 4 is a rear view, FIG. 5 is a top view, and FIGS. 6 and 7 are and FIG. 8 is FIG. 3 in a state where the upper and lower rollers are in specification. This is a diagram corresponding to FIGS. 4 and 5. In the drawing, 1 is a sewing machine frame, 4 is a jaw part, 7 is a sewing machine main shaft, 9 is a needle, 10 is a throat plate, 12 is a roller drive mechanism part,
22 is a roller drive shaft, 31 is a support mechanism section, 33 is a connecting shaft, 35 is a presser foot lifting lever 41 is an upper roller type roller assembly,
41' is an upper and lower roller assembly, 42 and 42' are roller holders, 43 and 43' are upper rollers, and 45 and 45
' is a transmission shaft, 52 is a transmission mechanism, and 62 is a presser foot lifting drive mechanism.

Claims (1)

[Claims] 1. In a sewing machine that sews workpiece cloth using a needle, looper, feed dog, etc. in the arm portion of the sewing machine frame, the sewing machine is mounted on the sewing machine frame so that its position can be adjusted between an upper roller configuration position and an upper and lower roller configuration position. a roller drive mechanism section having a roller drive shaft that is vertically oriented and rotatable in one direction; a transmission mechanism section that rotates the roller drive shaft of the roller drive mechanism section in accordance with rotation of the main shaft of the sewing machine; a support mechanism section that is attached to the mechanism section so as to be vertically adjustable and has a connecting shaft, the roller drive mechanism section being attached at an upper roller configuration position and the support mechanism section being attached at a lower position. In this state, the transmission shaft and the roller holder in an upper roller type roller assembly consisting of an upper roller corresponding to the throat plate of the arm, a roller holder that holds it, and a transmission shaft that transmits rotation to the upper roller are driven by the roller. It is detachably connected to the shaft and the connecting shaft, and when the roller drive mechanism section is attached to the upper and lower roller configuration positions and the support mechanism section is attached to the upper position, it is attached to the cloth feeding side of the arm section. The transmission shaft and roller holder in an upper and lower roller type roller assembly consisting of an upper roller corresponding to a lower roller, a roller holder that holds it, and a transmission shaft that transmits rotation to the upper roller are attached to and detached from the roller drive shaft and the connecting shaft. A cloth pulling roller device for a sewing machine, characterized in that the cloth pulling roller device can be connected together.